Dynamically link libusb-1.0

Removed libusbx from project and now require libusb-1.0 to be installed as a dependency. Required `apt-get install libusb-1.0-0-dev`

61 files changed, 7 insertions, 25177 deletions

diff --git a/src/3rd_party-static/CMakeLists.txt b/src/3rd_party-static/CMakeLists.txt
index 2acd7be27c..0b59c55d8a 100644
--- a/src/3rd_party-static/CMakeLists.txt
+++ b/src/3rd_party-static/CMakeLists.txt
@@ -40,14 +40,6 @@ set(MESSAGE_BROKER_INCLUDE_DIRECTORY ${MESSAGE_BROKER_INCLUDE_DIRECTORY} PARENT_
 add_subdirectory(./encryption)
 set(ENCRYPTION_INCLUDE_DIRECTORY ${ENCRYPTION_INCLUDE_DIRECTORY} PARENT_SCOPE)
 
-if (BUILD_USB_SUPPORT)
-  if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    add_subdirectory(./libusbx-1.0.16)
-    set(LIBUSB_INCLUDE_DIRECTORY ${LIBUSB_INCLUDE_DIRECTORY} PARENT_SCOPE)
-    set(LIBUSB_LIBS_DIRECTORY ${LIBUSB_LIBS_DIRECTORY} PARENT_SCOPE)
-  endif()
-endif()
-
 # --- gmock
 if(BUILD_TESTS)
   add_subdirectory(./gmock-1.7.0)
diff --git a/src/3rd_party-static/libusbx-1.0.16/CMakeLists.txt b/src/3rd_party-static/libusbx-1.0.16/CMakeLists.txt
deleted file mode 100644
index 105406c44e..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/CMakeLists.txt
+++ /dev/null
@@ -1,30 +0,0 @@
-set(LIBUSB_INCLUDE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
-set(LIBUSB_INCLUDE_DIRECTORY ${LIBUSB_INCLUDE_DIRECTORY} PARENT_SCOPE)
-
-set(LIBUSB_LIBS_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-set(LIBUSB_LIBS_DIRECTORY ${LIBUSB_LIBS_DIRECTORY} PARENT_SCOPE)
-
-include_directories (
-  ./libusb/os/
-  ./libusb/
-  ./
-)
-
-set (LIBUSB_SOURCES
-	./libusb/core.c
-	./libusb/descriptor.c
-	./libusb/hotplug.c
-	./libusb/io.c
-	./libusb/strerror.c
-	./libusb/sync.c
-	./libusb/os/linux_udev.c
-	./libusb/os/linux_netlink.c
-	./libusb/os/linux_usbfs.c
-	./libusb/os/poll_posix.c
-	./libusb/os/threads_posix.c
-)
-
-add_library("Libusb-1.0.16" ${LIBUSB_SOURCES})
-
-
-target_link_libraries("Libusb-1.0.16" udev)
diff --git a/src/3rd_party-static/libusbx-1.0.16/config.h b/src/3rd_party-static/libusbx-1.0.16/config.h
deleted file mode 100644
index 3c4543f2f1..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/config.h
+++ /dev/null
@@ -1,135 +0,0 @@
-/* config.h.  Generated from config.h.in by configure.  */
-/* config.h.in.  Generated from configure.ac by autoheader.  */
-
-/* Default visibility */
-#define DEFAULT_VISIBILITY __attribute__((visibility("default")))
-
-/* Start with debug message logging enabled */
-/* #undef ENABLE_DEBUG_LOGGING */
-
-/* Message logging */
-#define ENABLE_LOGGING 1
-
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#define HAVE_DLFCN_H 1
-
-/* Define to 1 if you have the `gettimeofday' function. */
-#define HAVE_GETTIMEOFDAY 1
-
-/* Define to 1 if you have the <inttypes.h> header file. */
-#define HAVE_INTTYPES_H 1
-
-/* Define to 1 if you have the `udev' library (-ludev). */
-#define HAVE_LIBUDEV 1
-
-/* Define to 1 if you have the <libudev.h> header file. */
-#define HAVE_LIBUDEV_H 1
-
-/* Define to 1 if you have the <linux/filter.h> header file. */
-/* #undef HAVE_LINUX_FILTER_H */
-
-/* Define to 1 if you have the <linux/netlink.h> header file. */
-/* #undef HAVE_LINUX_NETLINK_H */
-
-/* Define to 1 if you have the <memory.h> header file. */
-#define HAVE_MEMORY_H 1
-
-/* Define to 1 if you have the <poll.h> header file. */
-#define HAVE_POLL_H 1
-
-/* Define to 1 if you have the <signal.h> header file. */
-#define HAVE_SIGNAL_H 1
-
-/* Define to 1 if you have the <stdint.h> header file. */
-#define HAVE_STDINT_H 1
-
-/* Define to 1 if you have the <stdlib.h> header file. */
-#define HAVE_STDLIB_H 1
-
-/* Define to 1 if you have the <strings.h> header file. */
-#define HAVE_STRINGS_H 1
-
-/* Define to 1 if you have the <string.h> header file. */
-#define HAVE_STRING_H 1
-
-/* Define to 1 if the system has the type `struct timespec'. */
-#define HAVE_STRUCT_TIMESPEC 1
-
-/* Define to 1 if you have the <sys/stat.h> header file. */
-#define HAVE_SYS_STAT_H 1
-
-/* Define to 1 if you have the <sys/time.h> header file. */
-#define HAVE_SYS_TIME_H 1
-
-/* Define to 1 if you have the <sys/types.h> header file. */
-#define HAVE_SYS_TYPES_H 1
-
-/* Define to 1 if you have the <unistd.h> header file. */
-#define HAVE_UNISTD_H 1
-
-/* Define to the sub-directory in which libtool stores uninstalled libraries.
-   */
-#define LT_OBJDIR ".libs/"
-
-/* Define to 1 if your C compiler doesn't accept -c and -o together. */
-/* #undef NO_MINUS_C_MINUS_O */
-
-/* Darwin backend */
-/* #undef OS_DARWIN */
-
-/* Linux backend */
-#define OS_LINUX 1
-
-/* OpenBSD/NetBSD backend */
-/* #undef OS_OPENBSD */
-
-/* Windows backend */
-/* #undef OS_WINDOWS */
-
-/* Name of package */
-#define PACKAGE "libusbx"
-
-/* Define to the address where bug reports for this package should be sent. */
-#define PACKAGE_BUGREPORT "libusbx-devel@lists.sourceforge.net"
-
-/* Define to the full name of this package. */
-#define PACKAGE_NAME "libusbx"
-
-/* Define to the full name and version of this package. */
-#define PACKAGE_STRING "libusbx 1.0.16"
-
-/* Define to the one symbol short name of this package. */
-#define PACKAGE_TARNAME "libusbx"
-
-/* Define to the home page for this package. */
-#define PACKAGE_URL "http://libusbx.org"
-
-/* Define to the version of this package. */
-#define PACKAGE_VERSION "1.0.16"
-
-/* type of second poll() argument */
-#define POLL_NFDS_TYPE nfds_t
-
-/* Define to 1 if you have the ANSI C header files. */
-#define STDC_HEADERS 1
-
-/* Use POSIX Threads */
-#define THREADS_POSIX 1
-
-/* timerfd headers available */
-#define USBI_TIMERFD_AVAILABLE 1
-
-/* Use udev for device enumeration/hotplug */
-#define USE_UDEV 1
-
-/* Version number of package */
-#define VERSION "1.0.16"
-
-/* Use GNU extensions */
-#define _GNU_SOURCE 1
-
-/* Define to `__inline__' or `__inline' if that's what the C compiler
-   calls it, or to nothing if 'inline' is not supported under any name.  */
-#ifndef __cplusplus
-/* #undef inline */
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-core.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-core.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-core.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-darwin_usb.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-darwin_usb.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-darwin_usb.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-descriptor.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-descriptor.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-descriptor.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-hotplug.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-hotplug.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-hotplug.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-io.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-io.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-io.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_netlink.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_netlink.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_netlink.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_udev.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_udev.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_udev.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_usbfs.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_usbfs.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-linux_usbfs.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-openbsd_usb.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-openbsd_usb.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-openbsd_usb.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-poll_posix.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-poll_posix.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-poll_posix.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-poll_windows.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-poll_windows.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-poll_windows.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-strerror.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-strerror.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-strerror.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-sync.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-sync.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-sync.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-threads_posix.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-threads_posix.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-threads_posix.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-threads_windows.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-threads_windows.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-threads_windows.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-windows_usb.Plo b/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-windows_usb.Plo
deleted file mode 100644
index 9ce06a81ea..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/.deps/libusb_1_0_la-windows_usb.Plo
+++ /dev/null
@@ -1 +0,0 @@
-# dummy
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/Makefile.am b/src/3rd_party-static/libusbx-1.0.16/libusb/Makefile.am
deleted file mode 100644
index 7f9c1f9093..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/Makefile.am
+++ /dev/null
@@ -1,68 +0,0 @@
-all: libusb-1.0.la libusb-1.0.dll
-
-lib_LTLIBRARIES = libusb-1.0.la
-
-POSIX_POLL_SRC = os/poll_posix.c
-LINUX_USBFS_SRC = os/linux_usbfs.c
-DARWIN_USB_SRC = os/darwin_usb.c
-OPENBSD_USB_SRC = os/openbsd_usb.c
-WINDOWS_USB_SRC = os/poll_windows.c os/windows_usb.c libusb-1.0.rc libusb-1.0.def
-WINCE_USB_SRC = os/wince_usb.c os/wince_usb.h
-
-EXTRA_DIST = $(LINUX_USBFS_SRC) $(DARWIN_USB_SRC) $(OPENBSD_USB_SRC) \
-	$(WINDOWS_USB_SRC) $(WINCE_USB_SRC) \
-	$(POSIX_POLL_SRC) \
-	os/threads_posix.c os/threads_windows.c \
-	os/linux_udev.c os/linux_netlink.c
-
-if OS_LINUX
-
-if USE_UDEV
-OS_SRC = $(LINUX_USBFS_SRC) $(POSIX_POLL_SRC) \
-	os/linux_udev.c
-else
-OS_SRC = $(LINUX_USBFS_SRC) $(POSIX_POLL_SRC) \
-	os/linux_netlink.c
-endif
-
-endif
-
-if OS_DARWIN
-OS_SRC = $(DARWIN_USB_SRC) $(POSIX_POLL_SRC)
-AM_CFLAGS_EXT = -no-cpp-precomp
-endif
-
-if OS_OPENBSD
-OS_SRC = $(OPENBSD_USB_SRC) $(POSIX_POLL_SRC)
-endif
-
-if OS_WINDOWS
-OS_SRC = $(WINDOWS_USB_SRC)
-
-.rc.lo:
-	$(AM_V_GEN)$(LIBTOOL) $(AM_V_lt) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --tag=RC --mode=compile $(RC) $(RCFLAGS) -i $< -o $@
-
-libusb-1.0.rc: version.h version_nano.h
-endif
-
-libusb-1.0.dll: libusb-1.0.def
-if CREATE_IMPORT_LIB
-# Rebuild the import lib from the .def so that MS and MinGW DLLs can be interchanged
-	$(AM_V_GEN)$(DLLTOOL) $(DLLTOOLFLAGS) --kill-at --input-def $(srcdir)/libusb-1.0.def --dllname $@ --output-lib .libs/$@.a
-endif
-
-if THREADS_POSIX
-THREADS_SRC = os/threads_posix.h os/threads_posix.c
-else
-THREADS_SRC = os/threads_windows.h os/threads_windows.c
-endif
-
-libusb_1_0_la_CFLAGS = $(AM_CFLAGS)
-libusb_1_0_la_LDFLAGS = $(LTLDFLAGS)
-libusb_1_0_la_SOURCES = libusbi.h core.c descriptor.c io.c strerror.c sync.c \
-	os/linux_usbfs.h os/darwin_usb.h os/windows_usb.h os/windows_common.h \
-	hotplug.h hotplug.c $(THREADS_SRC) $(OS_SRC) \
-	os/poll_posix.h os/poll_windows.h
-
-hdrdir = $(includedir)/libusb-1.0
-hdr_HEADERS = libusb.h
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/Makefile.in b/src/3rd_party-static/libusbx-1.0.16/libusb/Makefile.in
deleted file mode 100644
index 2461c45a80..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/Makefile.in
+++ /dev/null
@@ -1,860 +0,0 @@
-# Makefile.in generated by automake 1.13.4 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2013 Free Software Foundation, Inc.
-
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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-subdir = libusb
-DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
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-	$(top_srcdir)/libusb/version.h $(top_srcdir)/configure.ac
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-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/core.c b/src/3rd_party-static/libusbx-1.0.16/libusb/core.c
deleted file mode 100644
index e29e8df254..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/core.c
+++ /dev/null
@@ -1,2228 +0,0 @@
-/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
-/*
- * Core functions for libusbx
- * Copyright © 2012-2013 Nathan Hjelm <hjelmn@cs.unm.edu>
- * Copyright © 2007-2008 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-
-#include <errno.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
-
-#ifdef __ANDROID__
-#include <android/log.h>
-#endif
-
-#include "libusbi.h"
-#include "hotplug.h"
-
-#if defined(OS_LINUX)
-const struct usbi_os_backend * const usbi_backend = &linux_usbfs_backend;
-#elif defined(OS_DARWIN)
-const struct usbi_os_backend * const usbi_backend = &darwin_backend;
-#elif defined(OS_OPENBSD)
-const struct usbi_os_backend * const usbi_backend = &openbsd_backend;
-#elif defined(OS_WINDOWS)
-const struct usbi_os_backend * const usbi_backend = &windows_backend;
-#elif defined(OS_WINCE)
-const struct usbi_os_backend * const usbi_backend = &wince_backend;
-#else
-#error "Unsupported OS"
-#endif
-
-struct libusb_context *usbi_default_context = NULL;
-const struct libusb_version libusb_version_internal =
-	{ LIBUSB_MAJOR, LIBUSB_MINOR, LIBUSB_MICRO, LIBUSB_NANO,
-	  LIBUSB_RC, "http://libusbx.org" };
-static int default_context_refcnt = 0;
-static usbi_mutex_static_t default_context_lock = USBI_MUTEX_INITIALIZER;
-static struct timeval timestamp_origin = { 0, 0 };
-
-usbi_mutex_static_t active_contexts_lock = USBI_MUTEX_INITIALIZER;
-struct list_head active_contexts_list;
-
-/**
- * \mainpage libusbx-1.0 API Reference
- *
- * \section intro Introduction
- *
- * libusbx is an open source library that allows you to communicate with USB
- * devices from userspace. For more info, see the
- * <a href="http://libusbx.org">libusbx homepage</a>.
- *
- * This documentation is aimed at application developers wishing to
- * communicate with USB peripherals from their own software. After reviewing
- * this documentation, feedback and questions can be sent to the
- * <a href="http://mailing-list.libusbx.org">libusbx-devel mailing list</a>.
- *
- * This documentation assumes knowledge of how to operate USB devices from
- * a software standpoint (descriptors, configurations, interfaces, endpoints,
- * control/bulk/interrupt/isochronous transfers, etc). Full information
- * can be found in the <a href="http://www.usb.org/developers/docs/">USB 3.0
- * Specification</a> which is available for free download. You can probably
- * find less verbose introductions by searching the web.
- *
- * \section features Library features
- *
- * - All transfer types supported (control/bulk/interrupt/isochronous)
- * - 2 transfer interfaces:
- *    -# Synchronous (simple)
- *    -# Asynchronous (more complicated, but more powerful)
- * - Thread safe (although the asynchronous interface means that you
- *   usually won't need to thread)
- * - Lightweight with lean API
- * - Compatible with libusb-0.1 through the libusb-compat-0.1 translation layer
- * - Hotplug support (on some platforms). See \ref hotplug.
- *
- * \section gettingstarted Getting Started
- *
- * To begin reading the API documentation, start with the Modules page which
- * links to the different categories of libusbx's functionality.
- *
- * One decision you will have to make is whether to use the synchronous
- * or the asynchronous data transfer interface. The \ref io documentation
- * provides some insight into this topic.
- *
- * Some example programs can be found in the libusbx source distribution under
- * the "examples" subdirectory. The libusbx homepage includes a list of
- * real-life project examples which use libusbx.
- *
- * \section errorhandling Error handling
- *
- * libusbx functions typically return 0 on success or a negative error code
- * on failure. These negative error codes relate to LIBUSB_ERROR constants
- * which are listed on the \ref misc "miscellaneous" documentation page.
- *
- * \section msglog Debug message logging
- *
- * libusbx uses stderr for all logging. By default, logging is set to NONE,
- * which means that no output will be produced. However, unless the library
- * has been compiled with logging disabled, then any application calls to
- * libusb_set_debug(), or the setting of the environmental variable
- * LIBUSB_DEBUG outside of the application, can result in logging being
- * produced. Your application should therefore not close stderr, but instead
- * direct it to the null device if its output is undesireable.
- *
- * The libusb_set_debug() function can be used to enable logging of certain
- * messages. Under standard configuration, libusbx doesn't really log much
- * so you are advised to use this function to enable all error/warning/
- * informational messages. It will help debug problems with your software.
- *
- * The logged messages are unstructured. There is no one-to-one correspondence
- * between messages being logged and success or failure return codes from
- * libusbx functions. There is no format to the messages, so you should not
- * try to capture or parse them. They are not and will not be localized.
- * These messages are not intended to being passed to your application user;
- * instead, you should interpret the error codes returned from libusbx functions
- * and provide appropriate notification to the user. The messages are simply
- * there to aid you as a programmer, and if you're confused because you're
- * getting a strange error code from a libusbx function, enabling message
- * logging may give you a suitable explanation.
- *
- * The LIBUSB_DEBUG environment variable can be used to enable message logging
- * at run-time. This environment variable should be set to a log level number,
- * which is interpreted the same as the libusb_set_debug() parameter. When this
- * environment variable is set, the message logging verbosity level is fixed
- * and libusb_set_debug() effectively does nothing.
- *
- * libusbx can be compiled without any logging functions, useful for embedded
- * systems. In this case, libusb_set_debug() and the LIBUSB_DEBUG environment
- * variable have no effects.
- *
- * libusbx can also be compiled with verbose debugging messages always. When
- * the library is compiled in this way, all messages of all verbosities are
- * always logged. libusb_set_debug() and the LIBUSB_DEBUG environment variable
- * have no effects.
- *
- * \section remarks Other remarks
- *
- * libusbx does have imperfections. The \ref caveats "caveats" page attempts
- * to document these.
- */
-
-/**
- * \page caveats Caveats
- *
- * \section devresets Device resets
- *
- * The libusb_reset_device() function allows you to reset a device. If your
- * program has to call such a function, it should obviously be aware that
- * the reset will cause device state to change (e.g. register values may be
- * reset).
- *
- * The problem is that any other program could reset the device your program
- * is working with, at any time. libusbx does not offer a mechanism to inform
- * you when this has happened, so if someone else resets your device it will
- * not be clear to your own program why the device state has changed.
- *
- * Ultimately, this is a limitation of writing drivers in userspace.
- * Separation from the USB stack in the underlying kernel makes it difficult
- * for the operating system to deliver such notifications to your program.
- * The Linux kernel USB stack allows such reset notifications to be delivered
- * to in-kernel USB drivers, but it is not clear how such notifications could
- * be delivered to second-class drivers that live in userspace.
- *
- * \section blockonly Blocking-only functionality
- *
- * The functionality listed below is only available through synchronous,
- * blocking functions. There are no asynchronous/non-blocking alternatives,
- * and no clear ways of implementing these.
- *
- * - Configuration activation (libusb_set_configuration())
- * - Interface/alternate setting activation (libusb_set_interface_alt_setting())
- * - Releasing of interfaces (libusb_release_interface())
- * - Clearing of halt/stall condition (libusb_clear_halt())
- * - Device resets (libusb_reset_device())
- *
- * \section configsel Configuration selection and handling
- *
- * When libusbx presents a device handle to an application, there is a chance
- * that the corresponding device may be in unconfigured state. For devices
- * with multiple configurations, there is also a chance that the configuration
- * currently selected is not the one that the application wants to use.
- *
- * The obvious solution is to add a call to libusb_set_configuration() early
- * on during your device initialization routines, but there are caveats to
- * be aware of:
- * -# If the device is already in the desired configuration, calling
- *    libusb_set_configuration() using the same configuration value will cause
- *    a lightweight device reset. This may not be desirable behaviour.
- * -# libusbx will be unable to change configuration if the device is in
- *    another configuration and other programs or drivers have claimed
- *    interfaces under that configuration.
- * -# In the case where the desired configuration is already active, libusbx
- *    may not even be able to perform a lightweight device reset. For example,
- *    take my USB keyboard with fingerprint reader: I'm interested in driving
- *    the fingerprint reader interface through libusbx, but the kernel's
- *    USB-HID driver will almost always have claimed the keyboard interface.
- *    Because the kernel has claimed an interface, it is not even possible to
- *    perform the lightweight device reset, so libusb_set_configuration() will
- *    fail. (Luckily the device in question only has a single configuration.)
- *
- * One solution to some of the above problems is to consider the currently
- * active configuration. If the configuration we want is already active, then
- * we don't have to select any configuration:
-\code
-cfg = libusb_get_configuration(dev);
-if (cfg != desired)
-	libusb_set_configuration(dev, desired);
-\endcode
- *
- * This is probably suitable for most scenarios, but is inherently racy:
- * another application or driver may change the selected configuration
- * <em>after</em> the libusb_get_configuration() call.
- *
- * Even in cases where libusb_set_configuration() succeeds, consider that other
- * applications or drivers may change configuration after your application
- * calls libusb_set_configuration().
- *
- * One possible way to lock your device into a specific configuration is as
- * follows:
- * -# Set the desired configuration (or use the logic above to realise that
- *    it is already in the desired configuration)
- * -# Claim the interface that you wish to use
- * -# Check that the currently active configuration is the one that you want
- *    to use.
- *
- * The above method works because once an interface is claimed, no application
- * or driver is able to select another configuration.
- *
- * \section earlycomp Early transfer completion
- *
- * NOTE: This section is currently Linux-centric. I am not sure if any of these
- * considerations apply to Darwin or other platforms.
- *
- * When a transfer completes early (i.e. when less data is received/sent in
- * any one packet than the transfer buffer allows for) then libusbx is designed
- * to terminate the transfer immediately, not transferring or receiving any
- * more data unless other transfers have been queued by the user.
- *
- * On legacy platforms, libusbx is unable to do this in all situations. After
- * the incomplete packet occurs, "surplus" data may be transferred. For recent
- * versions of libusbx, this information is kept (the data length of the
- * transfer is updated) and, for device-to-host transfers, any surplus data was
- * added to the buffer. Still, this is not a nice solution because it loses the
- * information about the end of the short packet, and the user probably wanted
- * that surplus data to arrive in the next logical transfer.
- *
- *
- * \section zlp Zero length packets
- *
- * - libusbx is able to send a packet of zero length to an endpoint simply by
- * submitting a transfer of zero length.
- * - The \ref libusb_transfer_flags::LIBUSB_TRANSFER_ADD_ZERO_PACKET
- * "LIBUSB_TRANSFER_ADD_ZERO_PACKET" flag is currently only supported on Linux.
- */
-
-/**
- * \page contexts Contexts
- *
- * It is possible that libusbx may be used simultaneously from two independent
- * libraries linked into the same executable. For example, if your application
- * has a plugin-like system which allows the user to dynamically load a range
- * of modules into your program, it is feasible that two independently
- * developed modules may both use libusbx.
- *
- * libusbx is written to allow for these multiple user scenarios. The two
- * "instances" of libusbx will not interfere: libusb_set_debug() calls
- * from one user will not affect the same settings for other users, other
- * users can continue using libusbx after one of them calls libusb_exit(), etc.
- *
- * This is made possible through libusbx's <em>context</em> concept. When you
- * call libusb_init(), you are (optionally) given a context. You can then pass
- * this context pointer back into future libusbx functions.
- *
- * In order to keep things simple for more simplistic applications, it is
- * legal to pass NULL to all functions requiring a context pointer (as long as
- * you're sure no other code will attempt to use libusbx from the same process).
- * When you pass NULL, the default context will be used. The default context
- * is created the first time a process calls libusb_init() when no other
- * context is alive. Contexts are destroyed during libusb_exit().
- *
- * The default context is reference-counted and can be shared. That means that
- * if libusb_init(NULL) is called twice within the same process, the two
- * users end up sharing the same context. The deinitialization and freeing of
- * the default context will only happen when the last user calls libusb_exit().
- * In other words, the default context is created and initialized when its
- * reference count goes from 0 to 1, and is deinitialized and destroyed when
- * its reference count goes from 1 to 0.
- *
- * You may be wondering why only a subset of libusbx functions require a
- * context pointer in their function definition. Internally, libusbx stores
- * context pointers in other objects (e.g. libusb_device instances) and hence
- * can infer the context from those objects.
- */
-
-/**
- * @defgroup lib Library initialization/deinitialization
- * This page details how to initialize and deinitialize libusbx. Initialization
- * must be performed before using any libusbx functionality, and similarly you
- * must not call any libusbx functions after deinitialization.
- */
-
-/**
- * @defgroup dev Device handling and enumeration
- * The functionality documented below is designed to help with the following
- * operations:
- * - Enumerating the USB devices currently attached to the system
- * - Choosing a device to operate from your software
- * - Opening and closing the chosen device
- *
- * \section nutshell In a nutshell...
- *
- * The description below really makes things sound more complicated than they
- * actually are. The following sequence of function calls will be suitable
- * for almost all scenarios and does not require you to have such a deep
- * understanding of the resource management issues:
- * \code
-// discover devices
-libusb_device **list;
-libusb_device *found = NULL;
-ssize_t cnt = libusb_get_device_list(NULL, &list);
-ssize_t i = 0;
-int err = 0;
-if (cnt < 0)
-	error();
-
-for (i = 0; i < cnt; i++) {
-	libusb_device *device = list[i];
-	if (is_interesting(device)) {
-		found = device;
-		break;
-	}
-}
-
-if (found) {
-	libusb_device_handle *handle;
-
-	err = libusb_open(found, &handle);
-	if (err)
-		error();
-	// etc
-}
-
-libusb_free_device_list(list, 1);
-\endcode
- *
- * The two important points:
- * - You asked libusb_free_device_list() to unreference the devices (2nd
- *   parameter)
- * - You opened the device before freeing the list and unreferencing the
- *   devices
- *
- * If you ended up with a handle, you can now proceed to perform I/O on the
- * device.
- *
- * \section devshandles Devices and device handles
- * libusbx has a concept of a USB device, represented by the
- * \ref libusb_device opaque type. A device represents a USB device that
- * is currently or was previously connected to the system. Using a reference
- * to a device, you can determine certain information about the device (e.g.
- * you can read the descriptor data).
- *
- * The libusb_get_device_list() function can be used to obtain a list of
- * devices currently connected to the system. This is known as device
- * discovery.
- *
- * Just because you have a reference to a device does not mean it is
- * necessarily usable. The device may have been unplugged, you may not have
- * permission to operate such device, or another program or driver may be
- * using the device.
- *
- * When you've found a device that you'd like to operate, you must ask
- * libusbx to open the device using the libusb_open() function. Assuming
- * success, libusbx then returns you a <em>device handle</em>
- * (a \ref libusb_device_handle pointer). All "real" I/O operations then
- * operate on the handle rather than the original device pointer.
- *
- * \section devref Device discovery and reference counting
- *
- * Device discovery (i.e. calling libusb_get_device_list()) returns a
- * freshly-allocated list of devices. The list itself must be freed when
- * you are done with it. libusbx also needs to know when it is OK to free
- * the contents of the list - the devices themselves.
- *
- * To handle these issues, libusbx provides you with two separate items:
- * - A function to free the list itself
- * - A reference counting system for the devices inside
- *
- * New devices presented by the libusb_get_device_list() function all have a
- * reference count of 1. You can increase and decrease reference count using
- * libusb_ref_device() and libusb_unref_device(). A device is destroyed when
- * its reference count reaches 0.
- *
- * With the above information in mind, the process of opening a device can
- * be viewed as follows:
- * -# Discover devices using libusb_get_device_list().
- * -# Choose the device that you want to operate, and call libusb_open().
- * -# Unref all devices in the discovered device list.
- * -# Free the discovered device list.
- *
- * The order is important - you must not unreference the device before
- * attempting to open it, because unreferencing it may destroy the device.
- *
- * For convenience, the libusb_free_device_list() function includes a
- * parameter to optionally unreference all the devices in the list before
- * freeing the list itself. This combines steps 3 and 4 above.
- *
- * As an implementation detail, libusb_open() actually adds a reference to
- * the device in question. This is because the device remains available
- * through the handle via libusb_get_device(). The reference is deleted during
- * libusb_close().
- */
-
-/** @defgroup misc Miscellaneous */
-
-/* we traverse usbfs without knowing how many devices we are going to find.
- * so we create this discovered_devs model which is similar to a linked-list
- * which grows when required. it can be freed once discovery has completed,
- * eliminating the need for a list node in the libusb_device structure
- * itself. */
-#define DISCOVERED_DEVICES_SIZE_STEP 8
-
-static struct discovered_devs *discovered_devs_alloc(void)
-{
-	struct discovered_devs *ret =
-		malloc(sizeof(*ret) + (sizeof(void *) * DISCOVERED_DEVICES_SIZE_STEP));
-
-	if (ret) {
-		ret->len = 0;
-		ret->capacity = DISCOVERED_DEVICES_SIZE_STEP;
-	}
-	return ret;
-}
-
-/* append a device to the discovered devices collection. may realloc itself,
- * returning new discdevs. returns NULL on realloc failure. */
-struct discovered_devs *discovered_devs_append(
-	struct discovered_devs *discdevs, struct libusb_device *dev)
-{
-	size_t len = discdevs->len;
-	size_t capacity;
-
-	/* if there is space, just append the device */
-	if (len < discdevs->capacity) {
-		discdevs->devices[len] = libusb_ref_device(dev);
-		discdevs->len++;
-		return discdevs;
-	}
-
-	/* exceeded capacity, need to grow */
-	usbi_dbg("need to increase capacity");
-	capacity = discdevs->capacity + DISCOVERED_DEVICES_SIZE_STEP;
-	discdevs = usbi_reallocf(discdevs,
-		sizeof(*discdevs) + (sizeof(void *) * capacity));
-	if (discdevs) {
-		discdevs->capacity = capacity;
-		discdevs->devices[len] = libusb_ref_device(dev);
-		discdevs->len++;
-	}
-
-	return discdevs;
-}
-
-static void discovered_devs_free(struct discovered_devs *discdevs)
-{
-	size_t i;
-
-	for (i = 0; i < discdevs->len; i++)
-		libusb_unref_device(discdevs->devices[i]);
-
-	free(discdevs);
-}
-
-/* Allocate a new device with a specific session ID. The returned device has
- * a reference count of 1. */
-struct libusb_device *usbi_alloc_device(struct libusb_context *ctx,
-	unsigned long session_id)
-{
-	size_t priv_size = usbi_backend->device_priv_size;
-	struct libusb_device *dev = calloc(1, sizeof(*dev) + priv_size);
-	int r;
-
-	if (!dev)
-		return NULL;
-
-	r = usbi_mutex_init(&dev->lock, NULL);
-	if (r) {
-		free(dev);
-		return NULL;
-	}
-
-	dev->ctx = ctx;
-	dev->refcnt = 1;
-	dev->session_data = session_id;
-	dev->speed = LIBUSB_SPEED_UNKNOWN;
-
-	if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
-		usbi_connect_device (dev);
-	}
-
-	return dev;
-}
-
-void usbi_connect_device(struct libusb_device *dev)
-{
-	libusb_hotplug_message message;
-	ssize_t ret;
-
-	memset(&message, 0, sizeof(message));
-	message.event = LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED;
-	message.device = dev;
-	dev->attached = 1;
-
-	usbi_mutex_lock(&dev->ctx->usb_devs_lock);
-	list_add(&dev->list, &dev->ctx->usb_devs);
-	usbi_mutex_unlock(&dev->ctx->usb_devs_lock);
-
-	/* Signal that an event has occurred for this device if we support hotplug AND
-	 * the hotplug pipe is ready. This prevents an event from getting raised during
-	 * initial enumeration. */
-	if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG) && dev->ctx->hotplug_pipe[1] > 0) {
-		ret = usbi_write(dev->ctx->hotplug_pipe[1], &message, sizeof(message));
-		if (sizeof (message) != ret) {
-			usbi_err(DEVICE_CTX(dev), "error writing hotplug message");
-		}
-	}
-}
-
-void usbi_disconnect_device(struct libusb_device *dev)
-{
-	libusb_hotplug_message message;
-	struct libusb_context *ctx = dev->ctx;
-	ssize_t ret;
-
-	memset(&message, 0, sizeof(message));
-	message.event = LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT;
-	message.device = dev;
-	usbi_mutex_lock(&dev->lock);
-	dev->attached = 0;
-	usbi_mutex_unlock(&dev->lock);
-
-	/* Signal that an event has occurred for this device if we support hotplug AND
-	 * the hotplug pipe is ready. This prevents an event from getting raised during
-	 * initial enumeration. libusb_handle_events will take care of dereferencing the
-	 * device. */
-	if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG) && dev->ctx->hotplug_pipe[1] > 0) {
-		ret = usbi_write(dev->ctx->hotplug_pipe[1], &message, sizeof(message));
-		if (sizeof(message) != ret) {
-			usbi_err(DEVICE_CTX(dev), "error writing hotplug message");
-		}
-	}
-
-	usbi_mutex_lock(&ctx->usb_devs_lock);
-	list_del(&dev->list);
-	usbi_mutex_unlock(&ctx->usb_devs_lock);
-}
-
-/* Perform some final sanity checks on a newly discovered device. If this
- * function fails (negative return code), the device should not be added
- * to the discovered device list. */
-int usbi_sanitize_device(struct libusb_device *dev)
-{
-	int r;
-	uint8_t num_configurations;
-
-	r = usbi_device_cache_descriptor(dev);
-	if (r < 0)
-		return r;
-
-	num_configurations = dev->device_descriptor.bNumConfigurations;
-	if (num_configurations > USB_MAXCONFIG) {
-		usbi_err(DEVICE_CTX(dev), "too many configurations");
-		return LIBUSB_ERROR_IO;
-	} else if (0 == num_configurations)
-		usbi_dbg("zero configurations, maybe an unauthorized device");
-
-	dev->num_configurations = num_configurations;
-	return 0;
-}
-
-/* Examine libusbx's internal list of known devices, looking for one with
- * a specific session ID. Returns the matching device if it was found, and
- * NULL otherwise. */
-struct libusb_device *usbi_get_device_by_session_id(struct libusb_context *ctx,
-	unsigned long session_id)
-{
-	struct libusb_device *dev;
-	struct libusb_device *ret = NULL;
-
-	usbi_mutex_lock(&ctx->usb_devs_lock);
-	list_for_each_entry(dev, &ctx->usb_devs, list, struct libusb_device)
-		if (dev->session_data == session_id) {
-			ret = dev;
-			break;
-		}
-	usbi_mutex_unlock(&ctx->usb_devs_lock);
-
-	return ret;
-}
-
-/** @ingroup dev
- * Returns a list of USB devices currently attached to the system. This is
- * your entry point into finding a USB device to operate.
- *
- * You are expected to unreference all the devices when you are done with
- * them, and then free the list with libusb_free_device_list(). Note that
- * libusb_free_device_list() can unref all the devices for you. Be careful
- * not to unreference a device you are about to open until after you have
- * opened it.
- *
- * This return value of this function indicates the number of devices in
- * the resultant list. The list is actually one element larger, as it is
- * NULL-terminated.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param list output location for a list of devices. Must be later freed with
- * libusb_free_device_list().
- * \returns the number of devices in the outputted list, or any
- * \ref libusb_error according to errors encountered by the backend.
- */
-ssize_t API_EXPORTED libusb_get_device_list(libusb_context *ctx,
-	libusb_device ***list)
-{
-	struct discovered_devs *discdevs = discovered_devs_alloc();
-	struct libusb_device **ret;
-	int r = 0;
-	ssize_t i, len;
-	USBI_GET_CONTEXT(ctx);
-	usbi_dbg("");
-
-	if (!discdevs)
-		return LIBUSB_ERROR_NO_MEM;
-
-	if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
-		/* backend provides hotplug support */
-		struct libusb_device *dev;
-
-		if (usbi_backend->hotplug_poll)
-			usbi_backend->hotplug_poll();
-
-		usbi_mutex_lock(&ctx->usb_devs_lock);
-		list_for_each_entry(dev, &ctx->usb_devs, list, struct libusb_device) {
-			discdevs = discovered_devs_append(discdevs, dev);
-
-			if (!discdevs) {
-				r = LIBUSB_ERROR_NO_MEM;
-				break;
-			}
-		}
-		usbi_mutex_unlock(&ctx->usb_devs_lock);
-	} else {
-		/* backend does not provide hotplug support */
-		r = usbi_backend->get_device_list(ctx, &discdevs);
-	}
-
-	if (r < 0) {
-		len = r;
-		goto out;
-	}
-
-	/* convert discovered_devs into a list */
-	len = discdevs->len;
-	ret = calloc(len + 1, sizeof(struct libusb_device *));
-	if (!ret) {
-		len = LIBUSB_ERROR_NO_MEM;
-		goto out;
-	}
-
-	ret[len] = NULL;
-	for (i = 0; i < len; i++) {
-		struct libusb_device *dev = discdevs->devices[i];
-		ret[i] = libusb_ref_device(dev);
-	}
-	*list = ret;
-
-out:
-	discovered_devs_free(discdevs);
-	return len;
-}
-
-/** \ingroup dev
- * Frees a list of devices previously discovered using
- * libusb_get_device_list(). If the unref_devices parameter is set, the
- * reference count of each device in the list is decremented by 1.
- * \param list the list to free
- * \param unref_devices whether to unref the devices in the list
- */
-void API_EXPORTED libusb_free_device_list(libusb_device **list,
-	int unref_devices)
-{
-	if (!list)
-		return;
-
-	if (unref_devices) {
-		int i = 0;
-		struct libusb_device *dev;
-
-		while ((dev = list[i++]) != NULL)
-			libusb_unref_device(dev);
-	}
-	free(list);
-}
-
-/** \ingroup dev
- * Get the number of the bus that a device is connected to.
- * \param dev a device
- * \returns the bus number
- */
-uint8_t API_EXPORTED libusb_get_bus_number(libusb_device *dev)
-{
-	return dev->bus_number;
-}
-
-/** \ingroup dev
- * Get the number of the port that a device is connected to.
- * Unless the OS does something funky, or you are hot-plugging USB extension cards,
- * the port number returned by this call is usually guaranteed to be uniquely tied
- * to a physical port, meaning that different devices plugged on the same physical
- * port should return the same port number.
- *
- * But outside of this, there is no guarantee that the port number returned by this
- * call will remain the same, or even match the order in which ports have been
- * numbered by the HUB/HCD manufacturer.
- *
- * \param dev a device
- * \returns the port number (0 if not available)
- */
-uint8_t API_EXPORTED libusb_get_port_number(libusb_device *dev)
-{
-	return dev->port_number;
-}
-
-/** \ingroup dev
- * Get the list of all port numbers from root for the specified device
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- * \param dev a device
- * \param port_numbers the array that should contain the port numbers
- * \param port_numbers_len the maximum length of the array. As per the USB 3.0
- * specs, the current maximum limit for the depth is 7.
- * \returns the number of elements filled
- * \returns LIBUSB_ERROR_OVERFLOW if the array is too small
- */
-int API_EXPORTED libusb_get_port_numbers(libusb_device *dev,
-	uint8_t* port_numbers, int port_numbers_len)
-{
-	int i = port_numbers_len;
-
-	while(dev) {
-		// HCDs can be listed as devices and would have port #0
-		// TODO: see how the other backends want to implement HCDs as parents
-		if (dev->port_number == 0)
-			break;
-		i--;
-		if (i < 0) {
-			usbi_warn(DEVICE_CTX(dev),
-				"port numbers array too small");
-			return LIBUSB_ERROR_OVERFLOW;
-		}
-		port_numbers[i] = dev->port_number;
-		dev = dev->parent_dev;
-	}
-	memmove(port_numbers, &port_numbers[i], port_numbers_len - i);
-	return port_numbers_len - i;
-}
-
-/** \ingroup dev
- * Deprecated please use libusb_get_port_numbers instead.
- */
-int API_EXPORTED libusb_get_port_path(libusb_context *ctx, libusb_device *dev,
-	uint8_t* port_numbers, uint8_t port_numbers_len)
-{
-	UNUSED(ctx);
-
-	return libusb_get_port_numbers(dev, port_numbers, port_numbers_len);
-}
-
-/** \ingroup dev
- * Get the the parent from the specified device.
- * \param dev a device
- * \returns the device parent or NULL if not available
- * You should issue a \ref libusb_get_device_list() before calling this
- * function and make sure that you only access the parent before issuing
- * \ref libusb_free_device_list(). The reason is that libusbx currently does
- * not maintain a permanent list of device instances, and therefore can
- * only guarantee that parents are fully instantiated within a 
- * libusb_get_device_list() - libusb_free_device_list() block.
- */
-DEFAULT_VISIBILITY
-libusb_device * LIBUSB_CALL libusb_get_parent(libusb_device *dev)
-{
-	return dev->parent_dev;
-}
-
-/** \ingroup dev
- * Get the address of the device on the bus it is connected to.
- * \param dev a device
- * \returns the device address
- */
-uint8_t API_EXPORTED libusb_get_device_address(libusb_device *dev)
-{
-	return dev->device_address;
-}
-
-/** \ingroup dev
- * Get the negotiated connection speed for a device.
- * \param dev a device
- * \returns a \ref libusb_speed code, where LIBUSB_SPEED_UNKNOWN means that
- * the OS doesn't know or doesn't support returning the negotiated speed.
- */
-int API_EXPORTED libusb_get_device_speed(libusb_device *dev)
-{
-	return dev->speed;
-}
-
-static const struct libusb_endpoint_descriptor *find_endpoint(
-	struct libusb_config_descriptor *config, unsigned char endpoint)
-{
-	int iface_idx;
-	for (iface_idx = 0; iface_idx < config->bNumInterfaces; iface_idx++) {
-		const struct libusb_interface *iface = &config->interface[iface_idx];
-		int altsetting_idx;
-
-		for (altsetting_idx = 0; altsetting_idx < iface->num_altsetting;
-				altsetting_idx++) {
-			const struct libusb_interface_descriptor *altsetting
-				= &iface->altsetting[altsetting_idx];
-			int ep_idx;
-
-			for (ep_idx = 0; ep_idx < altsetting->bNumEndpoints; ep_idx++) {
-				const struct libusb_endpoint_descriptor *ep =
-					&altsetting->endpoint[ep_idx];
-				if (ep->bEndpointAddress == endpoint)
-					return ep;
-			}
-		}
-	}
-	return NULL;
-}
-
-/** \ingroup dev
- * Convenience function to retrieve the wMaxPacketSize value for a particular
- * endpoint in the active device configuration.
- *
- * This function was originally intended to be of assistance when setting up
- * isochronous transfers, but a design mistake resulted in this function
- * instead. It simply returns the wMaxPacketSize value without considering
- * its contents. If you're dealing with isochronous transfers, you probably
- * want libusb_get_max_iso_packet_size() instead.
- *
- * \param dev a device
- * \param endpoint address of the endpoint in question
- * \returns the wMaxPacketSize value
- * \returns LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist
- * \returns LIBUSB_ERROR_OTHER on other failure
- */
-int API_EXPORTED libusb_get_max_packet_size(libusb_device *dev,
-	unsigned char endpoint)
-{
-	struct libusb_config_descriptor *config;
-	const struct libusb_endpoint_descriptor *ep;
-	int r;
-
-	r = libusb_get_active_config_descriptor(dev, &config);
-	if (r < 0) {
-		usbi_err(DEVICE_CTX(dev),
-			"could not retrieve active config descriptor");
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	ep = find_endpoint(config, endpoint);
-	if (!ep)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	r = ep->wMaxPacketSize;
-	libusb_free_config_descriptor(config);
-	return r;
-}
-
-/** \ingroup dev
- * Calculate the maximum packet size which a specific endpoint is capable is
- * sending or receiving in the duration of 1 microframe
- *
- * Only the active configuration is examined. The calculation is based on the
- * wMaxPacketSize field in the endpoint descriptor as described in section
- * 9.6.6 in the USB 2.0 specifications.
- *
- * If acting on an isochronous or interrupt endpoint, this function will
- * multiply the value found in bits 0:10 by the number of transactions per
- * microframe (determined by bits 11:12). Otherwise, this function just
- * returns the numeric value found in bits 0:10.
- *
- * This function is useful for setting up isochronous transfers, for example
- * you might pass the return value from this function to
- * libusb_set_iso_packet_lengths() in order to set the length field of every
- * isochronous packet in a transfer.
- *
- * Since v1.0.3.
- *
- * \param dev a device
- * \param endpoint address of the endpoint in question
- * \returns the maximum packet size which can be sent/received on this endpoint
- * \returns LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist
- * \returns LIBUSB_ERROR_OTHER on other failure
- */
-int API_EXPORTED libusb_get_max_iso_packet_size(libusb_device *dev,
-	unsigned char endpoint)
-{
-	struct libusb_config_descriptor *config;
-	const struct libusb_endpoint_descriptor *ep;
-	enum libusb_transfer_type ep_type;
-	uint16_t val;
-	int r;
-
-	r = libusb_get_active_config_descriptor(dev, &config);
-	if (r < 0) {
-		usbi_err(DEVICE_CTX(dev),
-			"could not retrieve active config descriptor");
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	ep = find_endpoint(config, endpoint);
-	if (!ep)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	val = ep->wMaxPacketSize;
-	ep_type = (enum libusb_transfer_type) (ep->bmAttributes & 0x3);
-	libusb_free_config_descriptor(config);
-
-	r = val & 0x07ff;
-	if (ep_type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS
-			|| ep_type == LIBUSB_TRANSFER_TYPE_INTERRUPT)
-		r *= (1 + ((val >> 11) & 3));
-	return r;
-}
-
-/** \ingroup dev
- * Increment the reference count of a device.
- * \param dev the device to reference
- * \returns the same device
- */
-DEFAULT_VISIBILITY
-libusb_device * LIBUSB_CALL libusb_ref_device(libusb_device *dev)
-{
-	usbi_mutex_lock(&dev->lock);
-	dev->refcnt++;
-	usbi_mutex_unlock(&dev->lock);
-	return dev;
-}
-
-/** \ingroup dev
- * Decrement the reference count of a device. If the decrement operation
- * causes the reference count to reach zero, the device shall be destroyed.
- * \param dev the device to unreference
- */
-void API_EXPORTED libusb_unref_device(libusb_device *dev)
-{
-	int refcnt;
-
-	if (!dev)
-		return;
-
-	usbi_mutex_lock(&dev->lock);
-	refcnt = --dev->refcnt;
-	usbi_mutex_unlock(&dev->lock);
-
-	if (refcnt == 0) {
-		usbi_dbg("destroy device %d.%d", dev->bus_number, dev->device_address);
-
-		libusb_unref_device(dev->parent_dev);
-
-		if (usbi_backend->destroy_device)
-			usbi_backend->destroy_device(dev);
-
-		if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
-			/* backend does not support hotplug */
-			usbi_disconnect_device(dev);
-		}
-
-		usbi_mutex_destroy(&dev->lock);
-		free(dev);
-	}
-}
-
-/*
- * Interrupt the iteration of the event handling thread, so that it picks
- * up the new fd.
- */
-void usbi_fd_notification(struct libusb_context *ctx)
-{
-	unsigned char dummy = 1;
-	ssize_t r;
-
-	if (ctx == NULL)
-		return;
-
-	/* record that we are messing with poll fds */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	ctx->pollfd_modify++;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-
-	/* write some data on control pipe to interrupt event handlers */
-	r = usbi_write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
-	if (r <= 0) {
-		usbi_warn(ctx, "internal signalling write failed");
-		usbi_mutex_lock(&ctx->pollfd_modify_lock);
-		ctx->pollfd_modify--;
-		usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-		return;
-	}
-
-	/* take event handling lock */
-	libusb_lock_events(ctx);
-
-	/* read the dummy data */
-	r = usbi_read(ctx->ctrl_pipe[0], &dummy, sizeof(dummy));
-	if (r <= 0)
-		usbi_warn(ctx, "internal signalling read failed");
-
-	/* we're done with modifying poll fds */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	ctx->pollfd_modify--;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-
-	/* Release event handling lock and wake up event waiters */
-	libusb_unlock_events(ctx);
-}
-
-/** \ingroup dev
- * Open a device and obtain a device handle. A handle allows you to perform
- * I/O on the device in question.
- *
- * Internally, this function adds a reference to the device and makes it
- * available to you through libusb_get_device(). This reference is removed
- * during libusb_close().
- *
- * This is a non-blocking function; no requests are sent over the bus.
- *
- * \param dev the device to open
- * \param handle output location for the returned device handle pointer. Only
- * populated when the return code is 0.
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NO_MEM on memory allocation failure
- * \returns LIBUSB_ERROR_ACCESS if the user has insufficient permissions
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- */
-int API_EXPORTED libusb_open(libusb_device *dev,
-	libusb_device_handle **handle)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	struct libusb_device_handle *_handle;
-	size_t priv_size = usbi_backend->device_handle_priv_size;
-	int r;
-	usbi_dbg("open %d.%d", dev->bus_number, dev->device_address);
-
-	if (!dev->attached) {
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	_handle = malloc(sizeof(*_handle) + priv_size);
-	if (!_handle)
-		return LIBUSB_ERROR_NO_MEM;
-
-	r = usbi_mutex_init(&_handle->lock, NULL);
-	if (r) {
-		free(_handle);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	_handle->dev = libusb_ref_device(dev);
-	_handle->auto_detach_kernel_driver = 0;
-	_handle->claimed_interfaces = 0;
-	memset(&_handle->os_priv, 0, priv_size);
-
-	r = usbi_backend->open(_handle);
-	if (r < 0) {
-		usbi_dbg("open %d.%d returns %d", dev->bus_number, dev->device_address, r);
-		libusb_unref_device(dev);
-		usbi_mutex_destroy(&_handle->lock);
-		free(_handle);
-		return r;
-	}
-
-	usbi_mutex_lock(&ctx->open_devs_lock);
-	list_add(&_handle->list, &ctx->open_devs);
-	usbi_mutex_unlock(&ctx->open_devs_lock);
-	*handle = _handle;
-
-	/* At this point, we want to interrupt any existing event handlers so
-	 * that they realise the addition of the new device's poll fd. One
-	 * example when this is desirable is if the user is running a separate
-	 * dedicated libusbx events handling thread, which is running with a long
-	 * or infinite timeout. We want to interrupt that iteration of the loop,
-	 * so that it picks up the new fd, and then continues. */
-	usbi_fd_notification(ctx);
-
-	return 0;
-}
-
-/** \ingroup dev
- * Convenience function for finding a device with a particular
- * <tt>idVendor</tt>/<tt>idProduct</tt> combination. This function is intended
- * for those scenarios where you are using libusbx to knock up a quick test
- * application - it allows you to avoid calling libusb_get_device_list() and
- * worrying about traversing/freeing the list.
- *
- * This function has limitations and is hence not intended for use in real
- * applications: if multiple devices have the same IDs it will only
- * give you the first one, etc.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param vendor_id the idVendor value to search for
- * \param product_id the idProduct value to search for
- * \returns a handle for the first found device, or NULL on error or if the
- * device could not be found. */
-DEFAULT_VISIBILITY
-libusb_device_handle * LIBUSB_CALL libusb_open_device_with_vid_pid(
-	libusb_context *ctx, uint16_t vendor_id, uint16_t product_id)
-{
-	struct libusb_device **devs;
-	struct libusb_device *found = NULL;
-	struct libusb_device *dev;
-	struct libusb_device_handle *handle = NULL;
-	size_t i = 0;
-	int r;
-
-	if (libusb_get_device_list(ctx, &devs) < 0)
-		return NULL;
-
-	while ((dev = devs[i++]) != NULL) {
-		struct libusb_device_descriptor desc;
-		r = libusb_get_device_descriptor(dev, &desc);
-		if (r < 0)
-			goto out;
-		if (desc.idVendor == vendor_id && desc.idProduct == product_id) {
-			found = dev;
-			break;
-		}
-	}
-
-	if (found) {
-		r = libusb_open(found, &handle);
-		if (r < 0)
-			handle = NULL;
-	}
-
-out:
-	libusb_free_device_list(devs, 1);
-	return handle;
-}
-
-static void do_close(struct libusb_context *ctx,
-	struct libusb_device_handle *dev_handle)
-{
-	struct usbi_transfer *itransfer;
-	struct usbi_transfer *tmp;
-
-	libusb_lock_events(ctx);
-
-	/* remove any transfers in flight that are for this device */
-	usbi_mutex_lock(&ctx->flying_transfers_lock);
-
-	/* safe iteration because transfers may be being deleted */
-	list_for_each_entry_safe(itransfer, tmp, &ctx->flying_transfers, list, struct usbi_transfer) {
-		struct libusb_transfer *transfer =
-			USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-		if (transfer->dev_handle != dev_handle)
-			continue;
-
-		if (!(itransfer->flags & USBI_TRANSFER_DEVICE_DISAPPEARED)) {
-			usbi_err(ctx, "Device handle closed while transfer was still being processed, but the device is still connected as far as we know");
-
-			if (itransfer->flags & USBI_TRANSFER_CANCELLING)
-				usbi_warn(ctx, "A cancellation for an in-flight transfer hasn't completed but closing the device handle");
-			else
-				usbi_err(ctx, "A cancellation hasn't even been scheduled on the transfer for which the device is closing");
-		}
-
-		/* remove from the list of in-flight transfers and make sure
-		 * we don't accidentally use the device handle in the future
-		 * (or that such accesses will be easily caught and identified as a crash)
-		 */
-		usbi_mutex_lock(&itransfer->lock);
-		list_del(&itransfer->list);
-		transfer->dev_handle = NULL;
-		usbi_mutex_unlock(&itransfer->lock);
-
-		/* it is up to the user to free up the actual transfer struct.  this is
-		 * just making sure that we don't attempt to process the transfer after
-		 * the device handle is invalid
-		 */
-		usbi_dbg("Removed transfer %p from the in-flight list because device handle %p closed",
-			 transfer, dev_handle);
-	}
-	usbi_mutex_unlock(&ctx->flying_transfers_lock);
-
-	libusb_unlock_events(ctx);
-
-	usbi_mutex_lock(&ctx->open_devs_lock);
-	list_del(&dev_handle->list);
-	usbi_mutex_unlock(&ctx->open_devs_lock);
-
-	usbi_backend->close(dev_handle);
-	libusb_unref_device(dev_handle->dev);
-	usbi_mutex_destroy(&dev_handle->lock);
-	free(dev_handle);
-}
-
-/** \ingroup dev
- * Close a device handle. Should be called on all open handles before your
- * application exits.
- *
- * Internally, this function destroys the reference that was added by
- * libusb_open() on the given device.
- *
- * This is a non-blocking function; no requests are sent over the bus.
- *
- * \param dev_handle the handle to close
- */
-void API_EXPORTED libusb_close(libusb_device_handle *dev_handle)
-{
-	struct libusb_context *ctx;
-	unsigned char dummy = 1;
-	ssize_t r;
-
-	if (!dev_handle)
-		return;
-	usbi_dbg("");
-
-	ctx = HANDLE_CTX(dev_handle);
-
-	/* Similarly to libusb_open(), we want to interrupt all event handlers
-	 * at this point. More importantly, we want to perform the actual close of
-	 * the device while holding the event handling lock (preventing any other
-	 * thread from doing event handling) because we will be removing a file
-	 * descriptor from the polling loop. */
-
-	/* record that we are messing with poll fds */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	ctx->pollfd_modify++;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-
-	/* write some data on control pipe to interrupt event handlers */
-	r = usbi_write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
-	if (r <= 0) {
-		usbi_warn(ctx, "internal signalling write failed, closing anyway");
-		do_close(ctx, dev_handle);
-		usbi_mutex_lock(&ctx->pollfd_modify_lock);
-		ctx->pollfd_modify--;
-		usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-		return;
-	}
-
-	/* take event handling lock */
-	libusb_lock_events(ctx);
-
-	/* read the dummy data */
-	r = usbi_read(ctx->ctrl_pipe[0], &dummy, sizeof(dummy));
-	if (r <= 0)
-		usbi_warn(ctx, "internal signalling read failed, closing anyway");
-
-	/* Close the device */
-	do_close(ctx, dev_handle);
-
-	/* we're done with modifying poll fds */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	ctx->pollfd_modify--;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-
-	/* Release event handling lock and wake up event waiters */
-	libusb_unlock_events(ctx);
-}
-
-/** \ingroup dev
- * Get the underlying device for a handle. This function does not modify
- * the reference count of the returned device, so do not feel compelled to
- * unreference it when you are done.
- * \param dev_handle a device handle
- * \returns the underlying device
- */
-DEFAULT_VISIBILITY
-libusb_device * LIBUSB_CALL libusb_get_device(libusb_device_handle *dev_handle)
-{
-	return dev_handle->dev;
-}
-
-/** \ingroup dev
- * Determine the bConfigurationValue of the currently active configuration.
- *
- * You could formulate your own control request to obtain this information,
- * but this function has the advantage that it may be able to retrieve the
- * information from operating system caches (no I/O involved).
- *
- * If the OS does not cache this information, then this function will block
- * while a control transfer is submitted to retrieve the information.
- *
- * This function will return a value of 0 in the <tt>config</tt> output
- * parameter if the device is in unconfigured state.
- *
- * \param dev a device handle
- * \param config output location for the bConfigurationValue of the active
- * configuration (only valid for return code 0)
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- */
-int API_EXPORTED libusb_get_configuration(libusb_device_handle *dev,
-	int *config)
-{
-	int r = LIBUSB_ERROR_NOT_SUPPORTED;
-
-	usbi_dbg("");
-	if (usbi_backend->get_configuration)
-		r = usbi_backend->get_configuration(dev, config);
-
-	if (r == LIBUSB_ERROR_NOT_SUPPORTED) {
-		uint8_t tmp = 0;
-		usbi_dbg("falling back to control message");
-		r = libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
-			LIBUSB_REQUEST_GET_CONFIGURATION, 0, 0, &tmp, 1, 1000);
-		if (r == 0) {
-			usbi_err(HANDLE_CTX(dev), "zero bytes returned in ctrl transfer?");
-			r = LIBUSB_ERROR_IO;
-		} else if (r == 1) {
-			r = 0;
-			*config = tmp;
-		} else {
-			usbi_dbg("control failed, error %d", r);
-		}
-	}
-
-	if (r == 0)
-		usbi_dbg("active config %d", *config);
-
-	return r;
-}
-
-/** \ingroup dev
- * Set the active configuration for a device.
- *
- * The operating system may or may not have already set an active
- * configuration on the device. It is up to your application to ensure the
- * correct configuration is selected before you attempt to claim interfaces
- * and perform other operations.
- *
- * If you call this function on a device already configured with the selected
- * configuration, then this function will act as a lightweight device reset:
- * it will issue a SET_CONFIGURATION request using the current configuration,
- * causing most USB-related device state to be reset (altsetting reset to zero,
- * endpoint halts cleared, toggles reset).
- *
- * You cannot change/reset configuration if your application has claimed
- * interfaces. It is advised to set the desired configuration before claiming
- * interfaces.
- *
- * Alternatively you can call libusb_release_interface() first. Note if you
- * do things this way you must ensure that auto_detach_kernel_driver for
- * <tt>dev</tt> is 0, otherwise the kernel driver will be re-attached when you
- * release the interface(s).
- *
- * You cannot change/reset configuration if other applications or drivers have
- * claimed interfaces.
- *
- * A configuration value of -1 will put the device in unconfigured state.
- * The USB specifications state that a configuration value of 0 does this,
- * however buggy devices exist which actually have a configuration 0.
- *
- * You should always use this function rather than formulating your own
- * SET_CONFIGURATION control request. This is because the underlying operating
- * system needs to know when such changes happen.
- *
- * This is a blocking function.
- *
- * \param dev a device handle
- * \param configuration the bConfigurationValue of the configuration you
- * wish to activate, or -1 if you wish to put the device in unconfigured state
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the requested configuration does not exist
- * \returns LIBUSB_ERROR_BUSY if interfaces are currently claimed
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- * \see libusb_set_auto_detach_kernel_driver()
- */
-int API_EXPORTED libusb_set_configuration(libusb_device_handle *dev,
-	int configuration)
-{
-	usbi_dbg("configuration %d", configuration);
-	return usbi_backend->set_configuration(dev, configuration);
-}
-
-/** \ingroup dev
- * Claim an interface on a given device handle. You must claim the interface
- * you wish to use before you can perform I/O on any of its endpoints.
- *
- * It is legal to attempt to claim an already-claimed interface, in which
- * case libusbx just returns 0 without doing anything.
- *
- * If auto_detach_kernel_driver is set to 1 for <tt>dev</tt>, the kernel driver
- * will be detached if necessary, on failure the detach error is returned.
- *
- * Claiming of interfaces is a purely logical operation; it does not cause
- * any requests to be sent over the bus. Interface claiming is used to
- * instruct the underlying operating system that your application wishes
- * to take ownership of the interface.
- *
- * This is a non-blocking function.
- *
- * \param dev a device handle
- * \param interface_number the <tt>bInterfaceNumber</tt> of the interface you
- * wish to claim
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the requested interface does not exist
- * \returns LIBUSB_ERROR_BUSY if another program or driver has claimed the
- * interface
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns a LIBUSB_ERROR code on other failure
- * \see libusb_set_auto_detach_kernel_driver()
- */
-int API_EXPORTED libusb_claim_interface(libusb_device_handle *dev,
-	int interface_number)
-{
-	int r = 0;
-
-	usbi_dbg("interface %d", interface_number);
-	if (interface_number >= USB_MAXINTERFACES)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	if (!dev->dev->attached)
-		return LIBUSB_ERROR_NO_DEVICE;
-
-	usbi_mutex_lock(&dev->lock);
-	if (dev->claimed_interfaces & (1 << interface_number))
-		goto out;
-
-	r = usbi_backend->claim_interface(dev, interface_number);
-	if (r == 0)
-		dev->claimed_interfaces |= 1 << interface_number;
-
-out:
-	usbi_mutex_unlock(&dev->lock);
-	return r;
-}
-
-/** \ingroup dev
- * Release an interface previously claimed with libusb_claim_interface(). You
- * should release all claimed interfaces before closing a device handle.
- *
- * This is a blocking function. A SET_INTERFACE control request will be sent
- * to the device, resetting interface state to the first alternate setting.
- *
- * If auto_detach_kernel_driver is set to 1 for <tt>dev</tt>, the kernel
- * driver will be re-attached after releasing the interface.
- *
- * \param dev a device handle
- * \param interface_number the <tt>bInterfaceNumber</tt> of the
- * previously-claimed interface
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the interface was not claimed
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- * \see libusb_set_auto_detach_kernel_driver()
- */
-int API_EXPORTED libusb_release_interface(libusb_device_handle *dev,
-	int interface_number)
-{
-	int r;
-
-	usbi_dbg("interface %d", interface_number);
-	if (interface_number >= USB_MAXINTERFACES)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	usbi_mutex_lock(&dev->lock);
-	if (!(dev->claimed_interfaces & (1 << interface_number))) {
-		r = LIBUSB_ERROR_NOT_FOUND;
-		goto out;
-	}
-
-	r = usbi_backend->release_interface(dev, interface_number);
-	if (r == 0)
-		dev->claimed_interfaces &= ~(1 << interface_number);
-
-out:
-	usbi_mutex_unlock(&dev->lock);
-	return r;
-}
-
-/** \ingroup dev
- * Activate an alternate setting for an interface. The interface must have
- * been previously claimed with libusb_claim_interface().
- *
- * You should always use this function rather than formulating your own
- * SET_INTERFACE control request. This is because the underlying operating
- * system needs to know when such changes happen.
- *
- * This is a blocking function.
- *
- * \param dev a device handle
- * \param interface_number the <tt>bInterfaceNumber</tt> of the
- * previously-claimed interface
- * \param alternate_setting the <tt>bAlternateSetting</tt> of the alternate
- * setting to activate
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the interface was not claimed, or the
- * requested alternate setting does not exist
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- */
-int API_EXPORTED libusb_set_interface_alt_setting(libusb_device_handle *dev,
-	int interface_number, int alternate_setting)
-{
-	usbi_dbg("interface %d altsetting %d",
-		interface_number, alternate_setting);
-	if (interface_number >= USB_MAXINTERFACES)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	usbi_mutex_lock(&dev->lock);
-	if (!dev->dev->attached) {
-		usbi_mutex_unlock(&dev->lock);
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	if (!(dev->claimed_interfaces & (1 << interface_number))) {
-		usbi_mutex_unlock(&dev->lock);
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-	usbi_mutex_unlock(&dev->lock);
-
-	return usbi_backend->set_interface_altsetting(dev, interface_number,
-		alternate_setting);
-}
-
-/** \ingroup dev
- * Clear the halt/stall condition for an endpoint. Endpoints with halt status
- * are unable to receive or transmit data until the halt condition is stalled.
- *
- * You should cancel all pending transfers before attempting to clear the halt
- * condition.
- *
- * This is a blocking function.
- *
- * \param dev a device handle
- * \param endpoint the endpoint to clear halt status
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- */
-int API_EXPORTED libusb_clear_halt(libusb_device_handle *dev,
-	unsigned char endpoint)
-{
-	usbi_dbg("endpoint %x", endpoint);
-	if (!dev->dev->attached)
-		return LIBUSB_ERROR_NO_DEVICE;
-
-	return usbi_backend->clear_halt(dev, endpoint);
-}
-
-/** \ingroup dev
- * Perform a USB port reset to reinitialize a device. The system will attempt
- * to restore the previous configuration and alternate settings after the
- * reset has completed.
- *
- * If the reset fails, the descriptors change, or the previous state cannot be
- * restored, the device will appear to be disconnected and reconnected. This
- * means that the device handle is no longer valid (you should close it) and
- * rediscover the device. A return code of LIBUSB_ERROR_NOT_FOUND indicates
- * when this is the case.
- *
- * This is a blocking function which usually incurs a noticeable delay.
- *
- * \param dev a handle of the device to reset
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if re-enumeration is required, or if the
- * device has been disconnected
- * \returns another LIBUSB_ERROR code on other failure
- */
-int API_EXPORTED libusb_reset_device(libusb_device_handle *dev)
-{
-	usbi_dbg("");
-	if (!dev->dev->attached)
-		return LIBUSB_ERROR_NO_DEVICE;
-
-	return usbi_backend->reset_device(dev);
-}
-
-/** \ingroup dev
- * Determine if a kernel driver is active on an interface. If a kernel driver
- * is active, you cannot claim the interface, and libusbx will be unable to
- * perform I/O.
- *
- * This functionality is not available on Windows.
- *
- * \param dev a device handle
- * \param interface_number the interface to check
- * \returns 0 if no kernel driver is active
- * \returns 1 if a kernel driver is active
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality
- * is not available
- * \returns another LIBUSB_ERROR code on other failure
- * \see libusb_detach_kernel_driver()
- */
-int API_EXPORTED libusb_kernel_driver_active(libusb_device_handle *dev,
-	int interface_number)
-{
-	usbi_dbg("interface %d", interface_number);
-
-	if (!dev->dev->attached)
-		return LIBUSB_ERROR_NO_DEVICE;
-
-	if (usbi_backend->kernel_driver_active)
-		return usbi_backend->kernel_driver_active(dev, interface_number);
-	else
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-/** \ingroup dev
- * Detach a kernel driver from an interface. If successful, you will then be
- * able to claim the interface and perform I/O.
- *
- * This functionality is not available on Darwin or Windows.
- *
- * Note that libusbx itself also talks to the device through a special kernel
- * driver, if this driver is already attached to the device, this call will
- * not detach it and return LIBUSB_ERROR_NOT_FOUND.
- *
- * \param dev a device handle
- * \param interface_number the interface to detach the driver from
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if no kernel driver was active
- * \returns LIBUSB_ERROR_INVALID_PARAM if the interface does not exist
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality
- * is not available
- * \returns another LIBUSB_ERROR code on other failure
- * \see libusb_kernel_driver_active()
- */
-int API_EXPORTED libusb_detach_kernel_driver(libusb_device_handle *dev,
-	int interface_number)
-{
-	usbi_dbg("interface %d", interface_number);
-
-	if (!dev->dev->attached)
-		return LIBUSB_ERROR_NO_DEVICE;
-
-	if (usbi_backend->detach_kernel_driver)
-		return usbi_backend->detach_kernel_driver(dev, interface_number);
-	else
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-/** \ingroup dev
- * Re-attach an interface's kernel driver, which was previously detached
- * using libusb_detach_kernel_driver(). This call is only effective on
- * Linux and returns LIBUSB_ERROR_NOT_SUPPORTED on all other platforms.
- *
- * This functionality is not available on Darwin or Windows.
- *
- * \param dev a device handle
- * \param interface_number the interface to attach the driver from
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if no kernel driver was active
- * \returns LIBUSB_ERROR_INVALID_PARAM if the interface does not exist
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality
- * is not available
- * \returns LIBUSB_ERROR_BUSY if the driver cannot be attached because the
- * interface is claimed by a program or driver
- * \returns another LIBUSB_ERROR code on other failure
- * \see libusb_kernel_driver_active()
- */
-int API_EXPORTED libusb_attach_kernel_driver(libusb_device_handle *dev,
-	int interface_number)
-{
-	usbi_dbg("interface %d", interface_number);
-
-	if (!dev->dev->attached)
-		return LIBUSB_ERROR_NO_DEVICE;
-
-	if (usbi_backend->attach_kernel_driver)
-		return usbi_backend->attach_kernel_driver(dev, interface_number);
-	else
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-/** \ingroup dev
- * Enable/disable libusbx's automatic kernel driver detachment. When this is
- * enabled libusbx will automatically detach the kernel driver on an interface
- * when claiming the interface, and attach it when releasing the interface.
- *
- * Automatic kernel driver detachment is disabled on newly opened device
- * handles by default.
- *
- * On platforms which do not have LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER
- * this function will return LIBUSB_ERROR_NOT_SUPPORTED, and libusbx will
- * continue as if this function was never called.
- *
- * \param dev a device handle
- * \param enable whether to enable or disable auto kernel driver detachment
- *
- * \returns LIBUSB_SUCCESS on success
- * \returns LIBUSB_ERROR_NOT_SUPPORTED on platforms where the functionality
- * is not available
- * \see libusb_claim_interface()
- * \see libusb_release_interface()
- * \see libusb_set_configuration()
- */
-int API_EXPORTED libusb_set_auto_detach_kernel_driver(
-	libusb_device_handle *dev, int enable)
-{
-	if (!(usbi_backend->caps & USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER))
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-
-	dev->auto_detach_kernel_driver = enable;
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup lib
- * Set log message verbosity.
- *
- * The default level is LIBUSB_LOG_LEVEL_NONE, which means no messages are ever
- * printed. If you choose to increase the message verbosity level, ensure
- * that your application does not close the stdout/stderr file descriptors.
- *
- * You are advised to use level LIBUSB_LOG_LEVEL_WARNING. libusbx is conservative
- * with its message logging and most of the time, will only log messages that
- * explain error conditions and other oddities. This will help you debug
- * your software.
- *
- * If the LIBUSB_DEBUG environment variable was set when libusbx was
- * initialized, this function does nothing: the message verbosity is fixed
- * to the value in the environment variable.
- *
- * If libusbx was compiled without any message logging, this function does
- * nothing: you'll never get any messages.
- *
- * If libusbx was compiled with verbose debug message logging, this function
- * does nothing: you'll always get messages from all levels.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param level debug level to set
- */
-void API_EXPORTED libusb_set_debug(libusb_context *ctx, int level)
-{
-	USBI_GET_CONTEXT(ctx);
-	if (!ctx->debug_fixed)
-		ctx->debug = level;
-}
-
-/** \ingroup lib
- * Initialize libusb. This function must be called before calling any other
- * libusbx function.
- *
- * If you do not provide an output location for a context pointer, a default
- * context will be created. If there was already a default context, it will
- * be reused (and nothing will be initialized/reinitialized).
- *
- * \param context Optional output location for context pointer.
- * Only valid on return code 0.
- * \returns 0 on success, or a LIBUSB_ERROR code on failure
- * \see contexts
- */
-int API_EXPORTED libusb_init(libusb_context **context)
-{
-	struct libusb_device *dev, *next;
-	char *dbg = getenv("LIBUSB_DEBUG");
-	struct libusb_context *ctx;
-	static int first_init = 1;
-	int r = 0;
-
-	usbi_mutex_static_lock(&default_context_lock);
-
-	if (!timestamp_origin.tv_sec) {
-		usbi_gettimeofday(&timestamp_origin, NULL);
-	}
-
-	if (!context && usbi_default_context) {
-		usbi_dbg("reusing default context");
-		default_context_refcnt++;
-		usbi_mutex_static_unlock(&default_context_lock);
-		return 0;
-	}
-
-	ctx = calloc(1, sizeof(*ctx));
-	if (!ctx) {
-		r = LIBUSB_ERROR_NO_MEM;
-		goto err_unlock;
-	}
-
-#ifdef ENABLE_DEBUG_LOGGING
-	ctx->debug = LIBUSB_LOG_LEVEL_DEBUG;
-#endif
-
-	if (dbg) {
-		ctx->debug = atoi(dbg);
-		if (ctx->debug)
-			ctx->debug_fixed = 1;
-	}
-
-	/* default context should be initialized before calling usbi_dbg */
-	if (!usbi_default_context) {
-		usbi_default_context = ctx;
-		default_context_refcnt++;
-		usbi_dbg("created default context");
-	}
-
-	usbi_dbg("libusbx v%d.%d.%d.%d", libusb_version_internal.major, libusb_version_internal.minor,
-		libusb_version_internal.micro, libusb_version_internal.nano);
-
-	usbi_mutex_init(&ctx->usb_devs_lock, NULL);
-	usbi_mutex_init(&ctx->open_devs_lock, NULL);
-	usbi_mutex_init(&ctx->hotplug_cbs_lock, NULL);
-	list_init(&ctx->usb_devs);
-	list_init(&ctx->open_devs);
-	list_init(&ctx->hotplug_cbs);
-
-	usbi_mutex_static_lock(&active_contexts_lock);
-	if (first_init) {
-		first_init = 0;
-		list_init (&active_contexts_list);
-	}
-	list_add (&ctx->list, &active_contexts_list);
-	usbi_mutex_static_unlock(&active_contexts_lock);
-
-	if (usbi_backend->init) {
-		r = usbi_backend->init(ctx);
-		if (r)
-			goto err_free_ctx;
-	}
-
-	r = usbi_io_init(ctx);
-	if (r < 0)
-		goto err_backend_exit;
-
-	usbi_mutex_static_unlock(&default_context_lock);
-
-	if (context)
-		*context = ctx;
-
-	return 0;
-
-err_backend_exit:
-	if (usbi_backend->exit)
-		usbi_backend->exit();
-err_free_ctx:
-	if (ctx == usbi_default_context)
-		usbi_default_context = NULL;
-
-	usbi_mutex_destroy(&ctx->open_devs_lock);
-	usbi_mutex_destroy(&ctx->usb_devs_lock);
-	usbi_mutex_destroy(&ctx->hotplug_cbs_lock);
-
-	usbi_mutex_static_lock(&active_contexts_lock);
-	list_del (&ctx->list);
-	usbi_mutex_static_unlock(&active_contexts_lock);
-
-	usbi_mutex_lock(&ctx->usb_devs_lock);
-	list_for_each_entry_safe(dev, next, &ctx->usb_devs, list, struct libusb_device) {
-		list_del(&dev->list);
-		libusb_unref_device(dev);
-	}
-	usbi_mutex_unlock(&ctx->usb_devs_lock);
-
-	free(ctx);
-err_unlock:
-	usbi_mutex_static_unlock(&default_context_lock);
-	return r;
-}
-
-/** \ingroup lib
- * Deinitialize libusb. Should be called after closing all open devices and
- * before your application terminates.
- * \param ctx the context to deinitialize, or NULL for the default context
- */
-void API_EXPORTED libusb_exit(struct libusb_context *ctx)
-{
-	struct libusb_device *dev, *next;
-
-	usbi_dbg("");
-	USBI_GET_CONTEXT(ctx);
-
-	/* if working with default context, only actually do the deinitialization
-	 * if we're the last user */
-	usbi_mutex_static_lock(&default_context_lock);
-	if (ctx == usbi_default_context) {
-		if (--default_context_refcnt > 0) {
-			usbi_dbg("not destroying default context");
-			usbi_mutex_static_unlock(&default_context_lock);
-			return;
-		}
-		usbi_dbg("destroying default context");
-		usbi_default_context = NULL;
-	}
-	usbi_mutex_static_unlock(&default_context_lock);
-
-	usbi_mutex_static_lock(&active_contexts_lock);
-	list_del (&ctx->list);
-	usbi_mutex_static_unlock(&active_contexts_lock);
-
-	if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
-		usbi_hotplug_deregister_all(ctx);
-		usbi_mutex_lock(&ctx->usb_devs_lock);
-		list_for_each_entry_safe(dev, next, &ctx->usb_devs, list, struct libusb_device) {
-			list_del(&dev->list);
-			libusb_unref_device(dev);
-		}
-		usbi_mutex_unlock(&ctx->usb_devs_lock);
-	}
-
-	/* a few sanity checks. don't bother with locking because unless
-	 * there is an application bug, nobody will be accessing these. */
-	if (!list_empty(&ctx->usb_devs))
-		usbi_warn(ctx, "some libusb_devices were leaked");
-	if (!list_empty(&ctx->open_devs))
-		usbi_warn(ctx, "application left some devices open");
-
-	usbi_io_exit(ctx);
-	if (usbi_backend->exit)
-		usbi_backend->exit();
-
-	usbi_mutex_destroy(&ctx->open_devs_lock);
-	usbi_mutex_destroy(&ctx->usb_devs_lock);
-	usbi_mutex_destroy(&ctx->hotplug_cbs_lock);
-	free(ctx);
-}
-
-/** \ingroup misc
- * Check at runtime if the loaded library has a given capability.
- * This call should be performed after \ref libusb_init(), to ensure the
- * backend has updated its capability set.
- *
- * \param capability the \ref libusb_capability to check for
- * \returns nonzero if the running library has the capability, 0 otherwise
- */
-int API_EXPORTED libusb_has_capability(uint32_t capability)
-{
-	switch (capability) {
-	case LIBUSB_CAP_HAS_CAPABILITY:
-		return 1;
-	case LIBUSB_CAP_HAS_HOTPLUG:
-		return !(usbi_backend->get_device_list);
-	case LIBUSB_CAP_HAS_HID_ACCESS:
-		return (usbi_backend->caps & USBI_CAP_HAS_HID_ACCESS);
-	case LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER:
-		return (usbi_backend->caps & USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER);
-	}
-	return 0;
-}
-
-/* this is defined in libusbi.h if needed */
-#ifdef LIBUSB_GETTIMEOFDAY_WIN32
-/*
- * gettimeofday
- * Implementation according to:
- * The Open Group Base Specifications Issue 6
- * IEEE Std 1003.1, 2004 Edition
- */
-
-/*
- *  THIS SOFTWARE IS NOT COPYRIGHTED
- *
- *  This source code is offered for use in the public domain. You may
- *  use, modify or distribute it freely.
- *
- *  This code is distributed in the hope that it will be useful but
- *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
- *  DISCLAIMED. This includes but is not limited to warranties of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- *  Contributed by:
- *  Danny Smith <dannysmith@users.sourceforge.net>
- */
-
-/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
-#define _W32_FT_OFFSET (116444736000000000)
-
-int usbi_gettimeofday(struct timeval *tp, void *tzp)
-{
-	union {
-		unsigned __int64 ns100; /* Time since 1 Jan 1601, in 100ns units */
-		FILETIME ft;
-	} _now;
-	UNUSED(tzp);
-
-	if(tp) {
-#if defined(OS_WINCE)
-		SYSTEMTIME st;
-		GetSystemTime(&st);
-		SystemTimeToFileTime(&st, &_now.ft);
-#else
-		GetSystemTimeAsFileTime (&_now.ft);
-#endif
-		tp->tv_usec=(long)((_now.ns100 / 10) % 1000000 );
-		tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000);
-	}
-	/* Always return 0 as per Open Group Base Specifications Issue 6.
-	   Do not set errno on error.  */
-	return 0;
-}
-#endif
-
-static void usbi_log_str(struct libusb_context *ctx, const char * str)
-{
-	UNUSED(ctx);
-	fputs(str, stderr);
-}
-
-void usbi_log_v(struct libusb_context *ctx, enum libusb_log_level level,
-	const char *function, const char *format, va_list args)
-{
-	const char *prefix = "";
-	char buf[USBI_MAX_LOG_LEN];
-	struct timeval now;
-	int global_debug, header_len, text_len;
-	static int has_debug_header_been_displayed = 0;
-
-#ifdef ENABLE_DEBUG_LOGGING
-	global_debug = 1;
-	UNUSED(ctx);
-#else
-	USBI_GET_CONTEXT(ctx);
-	if (ctx == NULL)
-		return;
-	global_debug = (ctx->debug == LIBUSB_LOG_LEVEL_DEBUG);
-	if (!ctx->debug)
-		return;
-	if (level == LIBUSB_LOG_LEVEL_WARNING && ctx->debug < LIBUSB_LOG_LEVEL_WARNING)
-		return;
-	if (level == LIBUSB_LOG_LEVEL_INFO && ctx->debug < LIBUSB_LOG_LEVEL_INFO)
-		return;
-	if (level == LIBUSB_LOG_LEVEL_DEBUG && ctx->debug < LIBUSB_LOG_LEVEL_DEBUG)
-		return;
-#endif
-
-#ifdef __ANDROID__
-	int prio;
-	switch (level) {
-	case LOG_LEVEL_INFO:
-		prio = ANDROID_LOG_INFO;
-		break;
-	case LOG_LEVEL_WARNING:
-		prio = ANDROID_LOG_WARN;
-		break;
-	case LOG_LEVEL_ERROR:
-		prio = ANDROID_LOG_ERROR;
-		break;
-	case LOG_LEVEL_DEBUG:
-		prio = ANDROID_LOG_DEBUG;
-		break;
-	default:
-		prio = ANDROID_LOG_UNKNOWN;
-		break;
-	}
-
-	__android_log_vprint(prio, "LibUsb", format, args);
-#else
-	usbi_gettimeofday(&now, NULL);
-	if ((global_debug) && (!has_debug_header_been_displayed)) {
-		has_debug_header_been_displayed = 1;
-		usbi_log_str(ctx, "[timestamp] [threadID] facility level [function call] <message>\n");
-		usbi_log_str(ctx, "--------------------------------------------------------------------------------\n");
-	}
-	if (now.tv_usec < timestamp_origin.tv_usec) {
-		now.tv_sec--;
-		now.tv_usec += 1000000;
-	}
-	now.tv_sec -= timestamp_origin.tv_sec;
-	now.tv_usec -= timestamp_origin.tv_usec;
-
-	switch (level) {
-	case LIBUSB_LOG_LEVEL_INFO:
-		prefix = "info";
-		break;
-	case LIBUSB_LOG_LEVEL_WARNING:
-		prefix = "warning";
-		break;
-	case LIBUSB_LOG_LEVEL_ERROR:
-		prefix = "error";
-		break;
-	case LIBUSB_LOG_LEVEL_DEBUG:
-		prefix = "debug";
-		break;
-	case LIBUSB_LOG_LEVEL_NONE:
-		break;
-	default:
-		prefix = "unknown";
-		break;
-	}
-
-	if (global_debug) {
-		header_len = snprintf(buf, sizeof(buf),
-			"[%2d.%06d] [%08x] libusbx: %s [%s] ",
-			(int)now.tv_sec, (int)now.tv_usec, usbi_get_tid(), prefix, function);
-	} else {
-		header_len = snprintf(buf, sizeof(buf),
-			"libusbx: %s [%s] ", prefix, function);
-	}
-
-	if (header_len < 0 || header_len >= sizeof(buf)) {
-		/* Somehow snprintf failed to write to the buffer,
-		 * remove the header so something useful is output. */
-		header_len = 0;
-	}
-	/* Make sure buffer is NUL terminated */
-	buf[header_len] = '\0';
-	text_len = vsnprintf(buf + header_len, sizeof(buf) - header_len,
-		format, args);
-	if (text_len < 0 || text_len + header_len >= sizeof(buf)) {
-		/* Truncated log output. On some platforms a -1 return value means
-		 * that the output was truncated. */
-		text_len = sizeof(buf) - header_len;
-	}
-	if (header_len + text_len + sizeof(USBI_LOG_LINE_END) >= sizeof(buf)) {
-		/* Need to truncate the text slightly to fit on the terminator. */
-		text_len -= (header_len + text_len + sizeof(USBI_LOG_LINE_END)) - sizeof(buf);
-	}
-	strcpy(buf + header_len + text_len, USBI_LOG_LINE_END);
-
-	usbi_log_str(ctx, buf);
-#endif
-}
-
-void usbi_log(struct libusb_context *ctx, enum libusb_log_level level,
-	const char *function, const char *format, ...)
-{
-	va_list args;
-
-	va_start (args, format);
-	usbi_log_v(ctx, level, function, format, args);
-	va_end (args);
-}
-
-/** \ingroup misc
- * Returns a constant NULL-terminated string with the ASCII name of a libusbx
- * error or transfer status code. The caller must not free() the returned
- * string.
- *
- * \param error_code The \ref libusb_error or libusb_transfer_status code to
- * return the name of.
- * \returns The error name, or the string **UNKNOWN** if the value of
- * error_code is not a known error / status code.
- */
-DEFAULT_VISIBILITY const char * LIBUSB_CALL libusb_error_name(int error_code)
-{
-	switch (error_code) {
-	case LIBUSB_ERROR_IO:
-		return "LIBUSB_ERROR_IO";
-	case LIBUSB_ERROR_INVALID_PARAM:
-		return "LIBUSB_ERROR_INVALID_PARAM";
-	case LIBUSB_ERROR_ACCESS:
-		return "LIBUSB_ERROR_ACCESS";
-	case LIBUSB_ERROR_NO_DEVICE:
-		return "LIBUSB_ERROR_NO_DEVICE";
-	case LIBUSB_ERROR_NOT_FOUND:
-		return "LIBUSB_ERROR_NOT_FOUND";
-	case LIBUSB_ERROR_BUSY:
-		return "LIBUSB_ERROR_BUSY";
-	case LIBUSB_ERROR_TIMEOUT:
-		return "LIBUSB_ERROR_TIMEOUT";
-	case LIBUSB_ERROR_OVERFLOW:
-		return "LIBUSB_ERROR_OVERFLOW";
-	case LIBUSB_ERROR_PIPE:
-		return "LIBUSB_ERROR_PIPE";
-	case LIBUSB_ERROR_INTERRUPTED:
-		return "LIBUSB_ERROR_INTERRUPTED";
-	case LIBUSB_ERROR_NO_MEM:
-		return "LIBUSB_ERROR_NO_MEM";
-	case LIBUSB_ERROR_NOT_SUPPORTED:
-		return "LIBUSB_ERROR_NOT_SUPPORTED";
-	case LIBUSB_ERROR_OTHER:
-		return "LIBUSB_ERROR_OTHER";
-
-	case LIBUSB_TRANSFER_ERROR:
-		return "LIBUSB_TRANSFER_ERROR";
-	case LIBUSB_TRANSFER_TIMED_OUT:
-		return "LIBUSB_TRANSFER_TIMED_OUT";
-	case LIBUSB_TRANSFER_CANCELLED:
-		return "LIBUSB_TRANSFER_CANCELLED";
-	case LIBUSB_TRANSFER_STALL:
-		return "LIBUSB_TRANSFER_STALL";
-	case LIBUSB_TRANSFER_NO_DEVICE:
-		return "LIBUSB_TRANSFER_NO_DEVICE";
-	case LIBUSB_TRANSFER_OVERFLOW:
-		return "LIBUSB_TRANSFER_OVERFLOW";
-
-	case 0:
-		return "LIBUSB_SUCCESS / LIBUSB_TRANSFER_COMPLETED";
-	default:
-		return "**UNKNOWN**";
-	}
-}
-
-/** \ingroup misc
- * Returns a pointer to const struct libusb_version with the version
- * (major, minor, micro, nano and rc) of the running library.
- */
-DEFAULT_VISIBILITY
-const struct libusb_version * LIBUSB_CALL libusb_get_version(void)
-{
-	return &libusb_version_internal;
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/descriptor.c b/src/3rd_party-static/libusbx-1.0.16/libusb/descriptor.c
deleted file mode 100644
index ba6d1467d7..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/descriptor.c
+++ /dev/null
@@ -1,1197 +0,0 @@
-/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
-/*
- * USB descriptor handling functions for libusbx
- * Copyright © 2007 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <errno.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "libusbi.h"
-
-#define DESC_HEADER_LENGTH		2
-#define DEVICE_DESC_LENGTH		18
-#define CONFIG_DESC_LENGTH		9
-#define INTERFACE_DESC_LENGTH		9
-#define ENDPOINT_DESC_LENGTH		7
-#define ENDPOINT_AUDIO_DESC_LENGTH	9
-
-/** @defgroup desc USB descriptors
- * This page details how to examine the various standard USB descriptors
- * for detected devices
- */
-
-/* set host_endian if the w values are already in host endian format,
- * as opposed to bus endian. */
-int usbi_parse_descriptor(const unsigned char *source, const char *descriptor,
-	void *dest, int host_endian)
-{
-	const unsigned char *sp = source;
-	unsigned char *dp = dest;
-	uint16_t w;
-	const char *cp;
-	uint32_t d;
-
-	for (cp = descriptor; *cp; cp++) {
-		switch (*cp) {
-			case 'b':	/* 8-bit byte */
-				*dp++ = *sp++;
-				break;
-			case 'w':	/* 16-bit word, convert from little endian to CPU */
-				dp += ((uintptr_t)dp & 1);	/* Align to word boundary */
-
-				if (host_endian) {
-					memcpy(dp, sp, 2);
-				} else {
-					w = (sp[1] << 8) | sp[0];
-					*((uint16_t *)dp) = w;
-				}
-				sp += 2;
-				dp += 2;
-				break;
-			case 'd':	/* 32-bit word, convert from little endian to CPU */
-				dp += ((uintptr_t)dp & 1);	/* Align to word boundary */
-
-				if (host_endian) {
-					memcpy(dp, sp, 4);
-				} else {
-					d = (sp[3] << 24) | (sp[2] << 16) |
-						(sp[1] << 8) | sp[0];
-					*((uint32_t *)dp) = d;
-				}
-				sp += 4;
-				dp += 4;
-				break;
-			case 'u':	/* 16 byte UUID */
-				memcpy(dp, sp, 16);
-				sp += 16;
-				dp += 16;
-				break;
-		}
-	}
-
-	return (int) (sp - source);
-}
-
-static void clear_endpoint(struct libusb_endpoint_descriptor *endpoint)
-{
-	if (endpoint->extra)
-		free((unsigned char *) endpoint->extra);
-}
-
-static int parse_endpoint(struct libusb_context *ctx,
-	struct libusb_endpoint_descriptor *endpoint, unsigned char *buffer,
-	int size, int host_endian)
-{
-	struct usb_descriptor_header header;
-	unsigned char *extra;
-	unsigned char *begin;
-	int parsed = 0;
-	int len;
-
-	if (size < DESC_HEADER_LENGTH) {
-		usbi_err(ctx, "short endpoint descriptor read %d/%d",
-			 size, DESC_HEADER_LENGTH);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(buffer, "bb", &header, 0);
-	if (header.bDescriptorType != LIBUSB_DT_ENDPOINT) {
-		usbi_err(ctx, "unexpected descriptor %x (expected %x)",
-			header.bDescriptorType, LIBUSB_DT_ENDPOINT);
-		return parsed;
-	}
-	if (header.bLength > size) {
-		usbi_warn(ctx, "short endpoint descriptor read %d/%d",
-			  size, header.bLength);
-		return parsed;
-	}
-	if (header.bLength >= ENDPOINT_AUDIO_DESC_LENGTH)
-		usbi_parse_descriptor(buffer, "bbbbwbbb", endpoint, host_endian);
-	else if (header.bLength >= ENDPOINT_DESC_LENGTH)
-		usbi_parse_descriptor(buffer, "bbbbwb", endpoint, host_endian);
-	else {
-		usbi_err(ctx, "invalid endpoint bLength (%d)", header.bLength);
-		return LIBUSB_ERROR_IO;
-	}
-
-	buffer += header.bLength;
-	size -= header.bLength;
-	parsed += header.bLength;
-
-	/* Skip over the rest of the Class Specific or Vendor Specific */
-	/*  descriptors */
-	begin = buffer;
-	while (size >= DESC_HEADER_LENGTH) {
-		usbi_parse_descriptor(buffer, "bb", &header, 0);
-		if (header.bLength < DESC_HEADER_LENGTH) {
-			usbi_err(ctx, "invalid extra ep desc len (%d)",
-				 header.bLength);
-			return LIBUSB_ERROR_IO;
-		} else if (header.bLength > size) {
-			usbi_warn(ctx, "short extra ep desc read %d/%d",
-				  size, header.bLength);
-			return parsed;
-		}
-
-		/* If we find another "proper" descriptor then we're done  */
-		if ((header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
-				(header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
-				(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
-				(header.bDescriptorType == LIBUSB_DT_DEVICE))
-			break;
-
-		usbi_dbg("skipping descriptor %x", header.bDescriptorType);
-		buffer += header.bLength;
-		size -= header.bLength;
-		parsed += header.bLength;
-	}
-
-	/* Copy any unknown descriptors into a storage area for drivers */
-	/*  to later parse */
-	len = (int)(buffer - begin);
-	if (!len) {
-		endpoint->extra = NULL;
-		endpoint->extra_length = 0;
-		return parsed;
-	}
-
-	extra = malloc(len);
-	endpoint->extra = extra;
-	if (!extra) {
-		endpoint->extra_length = 0;
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	memcpy(extra, begin, len);
-	endpoint->extra_length = len;
-
-	return parsed;
-}
-
-static void clear_interface(struct libusb_interface *usb_interface)
-{
-	int i;
-	int j;
-
-	if (usb_interface->altsetting) {
-		for (i = 0; i < usb_interface->num_altsetting; i++) {
-			struct libusb_interface_descriptor *ifp =
-				(struct libusb_interface_descriptor *)
-				usb_interface->altsetting + i;
-			if (ifp->extra)
-				free((void *) ifp->extra);
-			if (ifp->endpoint) {
-				for (j = 0; j < ifp->bNumEndpoints; j++)
-					clear_endpoint((struct libusb_endpoint_descriptor *)
-						ifp->endpoint + j);
-				free((void *) ifp->endpoint);
-			}
-		}
-		free((void *) usb_interface->altsetting);
-		usb_interface->altsetting = NULL;
-	}
-
-}
-
-static int parse_interface(libusb_context *ctx,
-	struct libusb_interface *usb_interface, unsigned char *buffer, int size,
-	int host_endian)
-{
-	int i;
-	int len;
-	int r;
-	int parsed = 0;
-	int interface_number = -1;
-	size_t tmp;
-	struct usb_descriptor_header header;
-	struct libusb_interface_descriptor *ifp;
-	unsigned char *begin;
-
-	usb_interface->num_altsetting = 0;
-
-	while (size >= INTERFACE_DESC_LENGTH) {
-		struct libusb_interface_descriptor *altsetting =
-			(struct libusb_interface_descriptor *) usb_interface->altsetting;
-		altsetting = usbi_reallocf(altsetting,
-			sizeof(struct libusb_interface_descriptor) *
-			(usb_interface->num_altsetting + 1));
-		if (!altsetting) {
-			r = LIBUSB_ERROR_NO_MEM;
-			goto err;
-		}
-		usb_interface->altsetting = altsetting;
-
-		ifp = altsetting + usb_interface->num_altsetting;
-		usbi_parse_descriptor(buffer, "bbbbbbbbb", ifp, 0);
-		if (ifp->bDescriptorType != LIBUSB_DT_INTERFACE) {
-			usbi_err(ctx, "unexpected descriptor %x (expected %x)",
-				 ifp->bDescriptorType, LIBUSB_DT_INTERFACE);
-			return parsed;
-		}
-		if (ifp->bLength < INTERFACE_DESC_LENGTH) {
-			usbi_err(ctx, "invalid interface bLength (%d)",
-				 ifp->bLength);
-			r = LIBUSB_ERROR_IO;
-			goto err;
-		}
-		if (ifp->bLength > size) {
-			usbi_warn(ctx, "short intf descriptor read %d/%d",
-				 size, ifp->bLength);
-			return parsed;
-		}
-		if (ifp->bNumEndpoints > USB_MAXENDPOINTS) {
-			usbi_err(ctx, "too many endpoints (%d)", ifp->bNumEndpoints);
-			r = LIBUSB_ERROR_IO;
-			goto err;
-		}
-
-		usb_interface->num_altsetting++;
-		ifp->extra = NULL;
-		ifp->extra_length = 0;
-		ifp->endpoint = NULL;
-
-		if (interface_number == -1)
-			interface_number = ifp->bInterfaceNumber;
-
-		/* Skip over the interface */
-		buffer += ifp->bLength;
-		parsed += ifp->bLength;
-		size -= ifp->bLength;
-
-		begin = buffer;
-
-		/* Skip over any interface, class or vendor descriptors */
-		while (size >= DESC_HEADER_LENGTH) {
-			usbi_parse_descriptor(buffer, "bb", &header, 0);
-			if (header.bLength < DESC_HEADER_LENGTH) {
-				usbi_err(ctx,
-					 "invalid extra intf desc len (%d)",
-					 header.bLength);
-				r = LIBUSB_ERROR_IO;
-				goto err;
-			} else if (header.bLength > size) {
-				usbi_warn(ctx,
-					  "short extra intf desc read %d/%d",
-					  size, header.bLength);
-				return parsed;
-			}
-
-			/* If we find another "proper" descriptor then we're done */
-			if ((header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
-					(header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
-					(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
-					(header.bDescriptorType == LIBUSB_DT_DEVICE))
-				break;
-
-			buffer += header.bLength;
-			parsed += header.bLength;
-			size -= header.bLength;
-		}
-
-		/* Copy any unknown descriptors into a storage area for */
-		/*  drivers to later parse */
-		len = (int)(buffer - begin);
-		if (len) {
-			ifp->extra = malloc(len);
-			if (!ifp->extra) {
-				r = LIBUSB_ERROR_NO_MEM;
-				goto err;
-			}
-			memcpy((unsigned char *) ifp->extra, begin, len);
-			ifp->extra_length = len;
-		}
-
-		if (ifp->bNumEndpoints > 0) {
-			struct libusb_endpoint_descriptor *endpoint;
-			tmp = ifp->bNumEndpoints * sizeof(struct libusb_endpoint_descriptor);
-			endpoint = malloc(tmp);
-			ifp->endpoint = endpoint;
-			if (!endpoint) {
-				r = LIBUSB_ERROR_NO_MEM;
-				goto err;
-			}
-
-			memset(endpoint, 0, tmp);
-			for (i = 0; i < ifp->bNumEndpoints; i++) {
-				r = parse_endpoint(ctx, endpoint + i, buffer, size,
-					host_endian);
-				if (r < 0)
-					goto err;
-				if (r == 0) {
-					ifp->bNumEndpoints = (uint8_t)i;
-					break;;
-				}
-
-				buffer += r;
-				parsed += r;
-				size -= r;
-			}
-		}
-
-		/* We check to see if it's an alternate to this one */
-		ifp = (struct libusb_interface_descriptor *) buffer;
-		if (size < LIBUSB_DT_INTERFACE_SIZE ||
-				ifp->bDescriptorType != LIBUSB_DT_INTERFACE ||
-				ifp->bInterfaceNumber != interface_number)
-			return parsed;
-	}
-
-	return parsed;
-err:
-	clear_interface(usb_interface);
-	return r;
-}
-
-static void clear_configuration(struct libusb_config_descriptor *config)
-{
-	if (config->interface) {
-		int i;
-		for (i = 0; i < config->bNumInterfaces; i++)
-			clear_interface((struct libusb_interface *)
-				config->interface + i);
-		free((void *) config->interface);
-	}
-	if (config->extra)
-		free((void *) config->extra);
-}
-
-static int parse_configuration(struct libusb_context *ctx,
-	struct libusb_config_descriptor *config, unsigned char *buffer,
-	int size, int host_endian)
-{
-	int i;
-	int r;
-	size_t tmp;
-	struct usb_descriptor_header header;
-	struct libusb_interface *usb_interface;
-
-	if (size < LIBUSB_DT_CONFIG_SIZE) {
-		usbi_err(ctx, "short config descriptor read %d/%d",
-			 size, LIBUSB_DT_CONFIG_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(buffer, "bbwbbbbb", config, host_endian);
-	if (config->bDescriptorType != LIBUSB_DT_CONFIG) {
-		usbi_err(ctx, "unexpected descriptor %x (expected %x)",
-			 config->bDescriptorType, LIBUSB_DT_CONFIG);
-		return LIBUSB_ERROR_IO;
-	}
-	if (config->bLength < LIBUSB_DT_CONFIG_SIZE) {
-		usbi_err(ctx, "invalid config bLength (%d)", config->bLength);
-		return LIBUSB_ERROR_IO;
-	}
-	if (config->bLength > size) {
-		usbi_err(ctx, "short config descriptor read %d/%d",
-			 size, config->bLength);
-		return LIBUSB_ERROR_IO;
-	}
-	if (config->bNumInterfaces > USB_MAXINTERFACES) {
-		usbi_err(ctx, "too many interfaces (%d)", config->bNumInterfaces);
-		return LIBUSB_ERROR_IO;
-	}
-
-	tmp = config->bNumInterfaces * sizeof(struct libusb_interface);
-	usb_interface = malloc(tmp);
-	config->interface = usb_interface;
-	if (!config->interface)
-		return LIBUSB_ERROR_NO_MEM;
-
-	memset(usb_interface, 0, tmp);
-	buffer += config->bLength;
-	size -= config->bLength;
-
-	config->extra = NULL;
-	config->extra_length = 0;
-
-	for (i = 0; i < config->bNumInterfaces; i++) {
-		int len;
-		unsigned char *begin;
-
-		/* Skip over the rest of the Class Specific or Vendor */
-		/*  Specific descriptors */
-		begin = buffer;
-		while (size >= DESC_HEADER_LENGTH) {
-			usbi_parse_descriptor(buffer, "bb", &header, 0);
-
-			if (header.bLength < DESC_HEADER_LENGTH) {
-				usbi_err(ctx,
-					 "invalid extra config desc len (%d)",
-					 header.bLength);
-				r = LIBUSB_ERROR_IO;
-				goto err;
-			} else if (header.bLength > size) {
-				usbi_warn(ctx,
-					  "short extra config desc read %d/%d",
-					  size, header.bLength);
-				config->bNumInterfaces = (uint8_t)i;
-				return size;
-			}
-
-			/* If we find another "proper" descriptor then we're done */
-			if ((header.bDescriptorType == LIBUSB_DT_ENDPOINT) ||
-					(header.bDescriptorType == LIBUSB_DT_INTERFACE) ||
-					(header.bDescriptorType == LIBUSB_DT_CONFIG) ||
-					(header.bDescriptorType == LIBUSB_DT_DEVICE))
-				break;
-
-			usbi_dbg("skipping descriptor 0x%x\n", header.bDescriptorType);
-			buffer += header.bLength;
-			size -= header.bLength;
-		}
-
-		/* Copy any unknown descriptors into a storage area for */
-		/*  drivers to later parse */
-		len = (int)(buffer - begin);
-		if (len) {
-			/* FIXME: We should realloc and append here */
-			if (!config->extra_length) {
-				config->extra = malloc(len);
-				if (!config->extra) {
-					r = LIBUSB_ERROR_NO_MEM;
-					goto err;
-				}
-
-				memcpy((unsigned char *) config->extra, begin, len);
-				config->extra_length = len;
-			}
-		}
-
-		r = parse_interface(ctx, usb_interface + i, buffer, size, host_endian);
-		if (r < 0)
-			goto err;
-		if (r == 0) {
-			config->bNumInterfaces = (uint8_t)i;
-			break;
-		}
-
-		buffer += r;
-		size -= r;
-	}
-
-	return size;
-
-err:
-	clear_configuration(config);
-	return r;
-}
-
-static int raw_desc_to_config(struct libusb_context *ctx,
-	unsigned char *buf, int size, int host_endian,
-	struct libusb_config_descriptor **config)
-{
-	struct libusb_config_descriptor *_config = malloc(sizeof(*_config));
-	int r;
-	
-	if (!_config)
-		return LIBUSB_ERROR_NO_MEM;
-
-	r = parse_configuration(ctx, _config, buf, size, host_endian);
-	if (r < 0) {
-		usbi_err(ctx, "parse_configuration failed with error %d", r);
-		free(_config);
-		return r;
-	} else if (r > 0) {
-		usbi_warn(ctx, "still %d bytes of descriptor data left", r);
-	}
-	
-	*config = _config;
-	return LIBUSB_SUCCESS;
-}
-
-int usbi_device_cache_descriptor(libusb_device *dev)
-{
-	int r, host_endian = 0;
-
-	r = usbi_backend->get_device_descriptor(dev, (unsigned char *) &dev->device_descriptor,
-						&host_endian);
-	if (r < 0)
-		return r;
-
-	if (!host_endian) {
-		dev->device_descriptor.bcdUSB = libusb_le16_to_cpu(dev->device_descriptor.bcdUSB);
-		dev->device_descriptor.idVendor = libusb_le16_to_cpu(dev->device_descriptor.idVendor);
-		dev->device_descriptor.idProduct = libusb_le16_to_cpu(dev->device_descriptor.idProduct);
-		dev->device_descriptor.bcdDevice = libusb_le16_to_cpu(dev->device_descriptor.bcdDevice);
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup desc
- * Get the USB device descriptor for a given device.
- *
- * This is a non-blocking function; the device descriptor is cached in memory.
- *
- * Note since libusbx-1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102, this
- * function always succeeds.
- *
- * \param dev the device
- * \param desc output location for the descriptor data
- * \returns 0 on success or a LIBUSB_ERROR code on failure
- */
-int API_EXPORTED libusb_get_device_descriptor(libusb_device *dev,
-	struct libusb_device_descriptor *desc)
-{
-	usbi_dbg("");
-	memcpy((unsigned char *) desc, (unsigned char *) &dev->device_descriptor,
-	       sizeof (dev->device_descriptor));
-	return 0;
-}
-
-/** \ingroup desc
- * Get the USB configuration descriptor for the currently active configuration.
- * This is a non-blocking function which does not involve any requests being
- * sent to the device.
- *
- * \param dev a device
- * \param config output location for the USB configuration descriptor. Only
- * valid if 0 was returned. Must be freed with libusb_free_config_descriptor()
- * after use.
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the device is in unconfigured state
- * \returns another LIBUSB_ERROR code on error
- * \see libusb_get_config_descriptor
- */
-int API_EXPORTED libusb_get_active_config_descriptor(libusb_device *dev,
-	struct libusb_config_descriptor **config)
-{
-	struct libusb_config_descriptor _config;
-	unsigned char tmp[LIBUSB_DT_CONFIG_SIZE];
-	unsigned char *buf = NULL;
-	int host_endian = 0;
-	int r;
-
-	r = usbi_backend->get_active_config_descriptor(dev, tmp,
-		LIBUSB_DT_CONFIG_SIZE, &host_endian);
-	if (r < 0)
-		return r;
-	if (r < LIBUSB_DT_CONFIG_SIZE) {
-		usbi_err(dev->ctx, "short config descriptor read %d/%d",
-			 r, LIBUSB_DT_CONFIG_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(tmp, "bbw", &_config, host_endian);
-	buf = malloc(_config.wTotalLength);
-	if (!buf)
-		return LIBUSB_ERROR_NO_MEM;
-
-	r = usbi_backend->get_active_config_descriptor(dev, buf,
-		_config.wTotalLength, &host_endian);
-	if (r >= 0)
-		r = raw_desc_to_config(dev->ctx, buf, r, host_endian, config);
-
-	free(buf);
-	return r;
-}
-
-/** \ingroup desc
- * Get a USB configuration descriptor based on its index.
- * This is a non-blocking function which does not involve any requests being
- * sent to the device.
- *
- * \param dev a device
- * \param config_index the index of the configuration you wish to retrieve
- * \param config output location for the USB configuration descriptor. Only
- * valid if 0 was returned. Must be freed with libusb_free_config_descriptor()
- * after use.
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
- * \returns another LIBUSB_ERROR code on error
- * \see libusb_get_active_config_descriptor()
- * \see libusb_get_config_descriptor_by_value()
- */
-int API_EXPORTED libusb_get_config_descriptor(libusb_device *dev,
-	uint8_t config_index, struct libusb_config_descriptor **config)
-{
-	struct libusb_config_descriptor _config;
-	unsigned char tmp[LIBUSB_DT_CONFIG_SIZE];
-	unsigned char *buf = NULL;
-	int host_endian = 0;
-	int r;
-
-	usbi_dbg("index %d", config_index);
-	if (config_index >= dev->num_configurations)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	r = usbi_backend->get_config_descriptor(dev, config_index, tmp,
-		LIBUSB_DT_CONFIG_SIZE, &host_endian);
-	if (r < 0)
-		return r;
-	if (r < LIBUSB_DT_CONFIG_SIZE) {
-		usbi_err(dev->ctx, "short config descriptor read %d/%d",
-			 r, LIBUSB_DT_CONFIG_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(tmp, "bbw", &_config, host_endian);
-	buf = malloc(_config.wTotalLength);
-	if (!buf)
-		return LIBUSB_ERROR_NO_MEM;
-
-	r = usbi_backend->get_config_descriptor(dev, config_index, buf,
-		_config.wTotalLength, &host_endian);
-	if (r >= 0)
-		r = raw_desc_to_config(dev->ctx, buf, r, host_endian, config);
-
-	free(buf);
-	return r;
-}
-
-/* iterate through all configurations, returning the index of the configuration
- * matching a specific bConfigurationValue in the idx output parameter, or -1
- * if the config was not found.
- * returns 0 or a LIBUSB_ERROR code
- */
-int usbi_get_config_index_by_value(struct libusb_device *dev,
-	uint8_t bConfigurationValue, int *idx)
-{
-	uint8_t i;
-
-	usbi_dbg("value %d", bConfigurationValue);
-	for (i = 0; i < dev->num_configurations; i++) {
-		unsigned char tmp[6];
-		int host_endian;
-		int r = usbi_backend->get_config_descriptor(dev, i, tmp, sizeof(tmp),
-			&host_endian);
-		if (r < 0)
-			return r;
-		if (tmp[5] == bConfigurationValue) {
-			*idx = i;
-			return 0;
-		}
-	}
-
-	*idx = -1;
-	return 0;
-}
-
-/** \ingroup desc
- * Get a USB configuration descriptor with a specific bConfigurationValue.
- * This is a non-blocking function which does not involve any requests being
- * sent to the device.
- *
- * \param dev a device
- * \param bConfigurationValue the bConfigurationValue of the configuration you
- * wish to retrieve
- * \param config output location for the USB configuration descriptor. Only
- * valid if 0 was returned. Must be freed with libusb_free_config_descriptor()
- * after use.
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
- * \returns another LIBUSB_ERROR code on error
- * \see libusb_get_active_config_descriptor()
- * \see libusb_get_config_descriptor()
- */
-int API_EXPORTED libusb_get_config_descriptor_by_value(libusb_device *dev,
-	uint8_t bConfigurationValue, struct libusb_config_descriptor **config)
-{
-	int r, idx, host_endian;
-	unsigned char *buf = NULL;
-
-	if (usbi_backend->get_config_descriptor_by_value) {
-		r = usbi_backend->get_config_descriptor_by_value(dev,
-			bConfigurationValue, &buf, &host_endian);
-		if (r < 0)
-			return r;
-		return raw_desc_to_config(dev->ctx, buf, r, host_endian, config);
-	}
-
-	r = usbi_get_config_index_by_value(dev, bConfigurationValue, &idx);
-	if (r < 0)
-		return r;
-	else if (idx == -1)
-		return LIBUSB_ERROR_NOT_FOUND;
-	else
-		return libusb_get_config_descriptor(dev, (uint8_t) idx, config);
-}
-
-/** \ingroup desc
- * Free a configuration descriptor obtained from
- * libusb_get_active_config_descriptor() or libusb_get_config_descriptor().
- * It is safe to call this function with a NULL config parameter, in which
- * case the function simply returns.
- *
- * \param config the configuration descriptor to free
- */
-void API_EXPORTED libusb_free_config_descriptor(
-	struct libusb_config_descriptor *config)
-{
-	if (!config)
-		return;
-
-	clear_configuration(config);
-	free(config);
-}
-
-/** \ingroup desc
- * Get an endpoints superspeed endpoint companion descriptor (if any)
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param endpoint endpoint descriptor from which to get the superspeed
- * endpoint companion descriptor
- * \param ep_comp output location for the superspeed endpoint companion
- * descriptor. Only valid if 0 was returned. Must be freed with
- * libusb_free_ss_endpoint_companion_descriptor() after use.
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
- * \returns another LIBUSB_ERROR code on error
- */
-int API_EXPORTED libusb_get_ss_endpoint_companion_descriptor(
-	struct libusb_context *ctx,
-	const struct libusb_endpoint_descriptor *endpoint,
-	struct libusb_ss_endpoint_companion_descriptor **ep_comp)
-{
-	struct usb_descriptor_header header;
-	int size = endpoint->extra_length;
-	const unsigned char *buffer = endpoint->extra;
-
-	*ep_comp = NULL;
-
-	while (size >= DESC_HEADER_LENGTH) {
-		usbi_parse_descriptor(buffer, "bb", &header, 0);
-		if (header.bLength < 2 || header.bLength > size) {
-			usbi_err(ctx, "invalid descriptor length %d",
-				 header.bLength);
-			return LIBUSB_ERROR_IO;
-		}
-		if (header.bDescriptorType != LIBUSB_DT_SS_ENDPOINT_COMPANION) {
-			buffer += header.bLength;
-			size -= header.bLength;
-			continue;
-		}
-		if (header.bLength < LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE) {
-			usbi_err(ctx, "invalid ss-ep-comp-desc length %d",
-				 header.bLength);
-			return LIBUSB_ERROR_IO;
-		}
-		*ep_comp = malloc(sizeof(**ep_comp));
-		if (*ep_comp == NULL)
-			return LIBUSB_ERROR_NO_MEM;
-		usbi_parse_descriptor(buffer, "bbbbw", *ep_comp, 0);
-		return LIBUSB_SUCCESS;
-	}
-	return LIBUSB_ERROR_NOT_FOUND;
-}
-
-/** \ingroup desc
- * Free a superspeed endpoint companion descriptor obtained from
- * libusb_get_ss_endpoint_companion_descriptor().
- * It is safe to call this function with a NULL ep_comp parameter, in which
- * case the function simply returns.
- *
- * \param ep_comp the superspeed endpoint companion descriptor to free
- */
-void API_EXPORTED libusb_free_ss_endpoint_companion_descriptor(
-	struct libusb_ss_endpoint_companion_descriptor *ep_comp)
-{
-	free(ep_comp);
-}
-
-static int parse_bos(struct libusb_context *ctx,
-	struct libusb_bos_descriptor **bos,
-	unsigned char *buffer, int size, int host_endian)
-{
-	struct libusb_bos_descriptor bos_header, *_bos;
-	struct libusb_bos_dev_capability_descriptor dev_cap;
-	int i;
-
-	if (size < LIBUSB_DT_BOS_SIZE) {
-		usbi_err(ctx, "short bos descriptor read %d/%d",
-			 size, LIBUSB_DT_BOS_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(buffer, "bbwb", &bos_header, host_endian);
-	if (bos_header.bDescriptorType != LIBUSB_DT_BOS) {
-		usbi_err(ctx, "unexpected descriptor %x (expected %x)",
-			 bos_header.bDescriptorType, LIBUSB_DT_BOS);
-		return LIBUSB_ERROR_IO;
-	}
-	if (bos_header.bLength < LIBUSB_DT_BOS_SIZE) {
-		usbi_err(ctx, "invalid bos bLength (%d)", bos_header.bLength);
-		return LIBUSB_ERROR_IO;
-	}
-	if (bos_header.bLength > size) {
-		usbi_err(ctx, "short bos descriptor read %d/%d",
-			 size, bos_header.bLength);
-		return LIBUSB_ERROR_IO;
-	}
-
-	_bos = calloc (1,
-		sizeof(*_bos) + bos_header.bNumDeviceCaps * sizeof(void *));
-	if (!_bos)
-		return LIBUSB_ERROR_NO_MEM;
-
-	usbi_parse_descriptor(buffer, "bbwb", _bos, host_endian);
-	buffer += bos_header.bLength;
-	size -= bos_header.bLength;
-
-	/* Get the device capability descriptors */
-	for (i = 0; i < bos_header.bNumDeviceCaps; i++) {
-		if (size < LIBUSB_DT_DEVICE_CAPABILITY_SIZE) {
-			usbi_warn(ctx, "short dev-cap descriptor read %d/%d",
-				  size, LIBUSB_DT_DEVICE_CAPABILITY_SIZE);
-			break;
-		}
-		usbi_parse_descriptor(buffer, "bbb", &dev_cap, host_endian);
-		if (dev_cap.bDescriptorType != LIBUSB_DT_DEVICE_CAPABILITY) {
-			usbi_warn(ctx, "unexpected descriptor %x (expected %x)",
-				  dev_cap.bDescriptorType, LIBUSB_DT_DEVICE_CAPABILITY);
-			break;
-		}
-		if (dev_cap.bLength < LIBUSB_DT_DEVICE_CAPABILITY_SIZE) {
-			usbi_err(ctx, "invalid dev-cap bLength (%d)",
-				 dev_cap.bLength);
-			libusb_free_bos_descriptor(_bos);
-			return LIBUSB_ERROR_IO;
-		}
-		if (dev_cap.bLength > size) {
-			usbi_warn(ctx, "short dev-cap descriptor read %d/%d",
-				  size, dev_cap.bLength);
-			break;
-		}
-
-		_bos->dev_capability[i] = malloc(dev_cap.bLength);
-		if (!_bos->dev_capability[i]) {
-			libusb_free_bos_descriptor(_bos);
-			return LIBUSB_ERROR_NO_MEM;
-		}
-		memcpy(_bos->dev_capability[i], buffer, dev_cap.bLength);
-		buffer += dev_cap.bLength;
-		size -= dev_cap.bLength;
-	}
-	_bos->bNumDeviceCaps = (uint8_t)i;
-	*bos = _bos;
-
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup desc
- * Get a Binary Object Store (BOS) descriptor
- * This is a BLOCKING function, which will send requests to the device.
- *
- * \param handle the handle of an open libusb device
- * \param bos output location for the BOS descriptor. Only valid if 0 was returned.
- * Must be freed with \ref libusb_free_bos_descriptor() after use.
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the device doesn't have a BOS descriptor
- * \returns another LIBUSB_ERROR code on error
- */
-int API_EXPORTED libusb_get_bos_descriptor(libusb_device_handle *handle,
-	struct libusb_bos_descriptor **bos)
-{
-	struct libusb_bos_descriptor _bos;
-	uint8_t bos_header[LIBUSB_DT_BOS_SIZE] = {0};
-	unsigned char *bos_data = NULL;
-	const int host_endian = 0;
-	int r;
-
-	/* Read the BOS. This generates 2 requests on the bus,
-	 * one for the header, and one for the full BOS */
-	r = libusb_get_descriptor(handle, LIBUSB_DT_BOS, 0, bos_header,
-				  LIBUSB_DT_BOS_SIZE);
-	if (r < 0) {
-		if (r != LIBUSB_ERROR_PIPE)
-			usbi_err(handle->dev->ctx, "failed to read BOS (%d)", r);
-		return r;
-	}
-	if (r < LIBUSB_DT_BOS_SIZE) {
-		usbi_err(handle->dev->ctx, "short BOS read %d/%d",
-			 r, LIBUSB_DT_BOS_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(bos_header, "bbwb", &_bos, host_endian);
-	usbi_dbg("found BOS descriptor: size %d bytes, %d capabilities",
-		 _bos.wTotalLength, _bos.bNumDeviceCaps);
-	bos_data = calloc(_bos.wTotalLength, 1);
-	if (bos_data == NULL)
-		return LIBUSB_ERROR_NO_MEM;
-
-	r = libusb_get_descriptor(handle, LIBUSB_DT_BOS, 0, bos_data,
-				  _bos.wTotalLength);
-	if (r >= 0)
-		r = parse_bos(handle->dev->ctx, bos, bos_data, r, host_endian);
-	else
-		usbi_err(handle->dev->ctx, "failed to read BOS (%d)", r);
-
-	free(bos_data);
-	return r;
-}
-
-/** \ingroup desc
- * Free a BOS descriptor obtained from libusb_get_bos_descriptor().
- * It is safe to call this function with a NULL bos parameter, in which
- * case the function simply returns.
- *
- * \param bos the BOS descriptor to free
- */
-void API_EXPORTED libusb_free_bos_descriptor(struct libusb_bos_descriptor *bos)
-{
-	int i;
-
-	if (!bos)
-		return;
-
-	for (i = 0; i < bos->bNumDeviceCaps; i++)
-		free(bos->dev_capability[i]);
-	free(bos);
-}
-
-/** \ingroup desc
- * Get an USB 2.0 Extension descriptor
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param dev_cap Device Capability descriptor with a bDevCapabilityType of
- * \ref libusb_capability_type::LIBUSB_BT_USB_2_0_EXTENSION
- * LIBUSB_BT_USB_2_0_EXTENSION
- * \param usb_2_0_extension output location for the USB 2.0 Extension
- * descriptor. Only valid if 0 was returned. Must be freed with
- * libusb_free_usb_2_0_extension_descriptor() after use.
- * \returns 0 on success
- * \returns a LIBUSB_ERROR code on error
- */
-int API_EXPORTED libusb_get_usb_2_0_extension_descriptor(
-	struct libusb_context *ctx,
-	struct libusb_bos_dev_capability_descriptor *dev_cap,
-	struct libusb_usb_2_0_extension_descriptor **usb_2_0_extension)
-{
-	struct libusb_usb_2_0_extension_descriptor *_usb_2_0_extension;
-	const int host_endian = 0;
-
-	if (dev_cap->bDevCapabilityType != LIBUSB_BT_USB_2_0_EXTENSION) {
-		usbi_err(ctx, "unexpected bDevCapabilityType %x (expected %x)",
-			 dev_cap->bDevCapabilityType,
-			 LIBUSB_BT_USB_2_0_EXTENSION);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-	if (dev_cap->bLength < LIBUSB_BT_USB_2_0_EXTENSION_SIZE) {
-		usbi_err(ctx, "short dev-cap descriptor read %d/%d",
-			 dev_cap->bLength, LIBUSB_BT_USB_2_0_EXTENSION_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	_usb_2_0_extension = malloc(sizeof(*_usb_2_0_extension));
-	if (!_usb_2_0_extension)
-		return LIBUSB_ERROR_NO_MEM;
-
-	usbi_parse_descriptor((unsigned char *)dev_cap, "bbbd",
-			      _usb_2_0_extension, host_endian);
-
-	*usb_2_0_extension = _usb_2_0_extension;
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup desc
- * Free a USB 2.0 Extension descriptor obtained from
- * libusb_get_usb_2_0_extension_descriptor().
- * It is safe to call this function with a NULL usb_2_0_extension parameter,
- * in which case the function simply returns.
- *
- * \param usb_2_0_extension the USB 2.0 Extension descriptor to free
- */
-void API_EXPORTED libusb_free_usb_2_0_extension_descriptor(
-	struct libusb_usb_2_0_extension_descriptor *usb_2_0_extension)
-{
-	free(usb_2_0_extension);
-}
-
-/** \ingroup desc
- * Get a SuperSpeed USB Device Capability descriptor
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param dev_cap Device Capability descriptor with a bDevCapabilityType of
- * \ref libusb_capability_type::LIBUSB_BT_SS_USB_DEVICE_CAPABILITY
- * LIBUSB_BT_SS_USB_DEVICE_CAPABILITY
- * \param ss_usb_device_cap output location for the SuperSpeed USB Device
- * Capability descriptor. Only valid if 0 was returned. Must be freed with
- * libusb_free_ss_usb_device_capability_descriptor() after use.
- * \returns 0 on success
- * \returns a LIBUSB_ERROR code on error
- */
-int API_EXPORTED libusb_get_ss_usb_device_capability_descriptor(
-	struct libusb_context *ctx,
-	struct libusb_bos_dev_capability_descriptor *dev_cap,
-	struct libusb_ss_usb_device_capability_descriptor **ss_usb_device_cap)
-{
-	struct libusb_ss_usb_device_capability_descriptor *_ss_usb_device_cap;
-	const int host_endian = 0;
-
-	if (dev_cap->bDevCapabilityType != LIBUSB_BT_SS_USB_DEVICE_CAPABILITY) {
-		usbi_err(ctx, "unexpected bDevCapabilityType %x (expected %x)",
-			 dev_cap->bDevCapabilityType,
-			 LIBUSB_BT_SS_USB_DEVICE_CAPABILITY);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-	if (dev_cap->bLength < LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE) {
-		usbi_err(ctx, "short dev-cap descriptor read %d/%d",
-			 dev_cap->bLength, LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	_ss_usb_device_cap = malloc(sizeof(*_ss_usb_device_cap));
-	if (!_ss_usb_device_cap)
-		return LIBUSB_ERROR_NO_MEM;
-
-	usbi_parse_descriptor((unsigned char *)dev_cap, "bbbbwbbw",
-			      _ss_usb_device_cap, host_endian);
-
-	*ss_usb_device_cap = _ss_usb_device_cap;
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup desc
- * Free a SuperSpeed USB Device Capability descriptor obtained from
- * libusb_get_ss_usb_device_capability_descriptor().
- * It is safe to call this function with a NULL ss_usb_device_cap
- * parameter, in which case the function simply returns.
- *
- * \param ss_usb_device_cap the USB 2.0 Extension descriptor to free
- */
-void API_EXPORTED libusb_free_ss_usb_device_capability_descriptor(
-	struct libusb_ss_usb_device_capability_descriptor *ss_usb_device_cap)
-{
-	free(ss_usb_device_cap);
-}
-
-/** \ingroup desc
- * Get a Container ID descriptor
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param dev_cap Device Capability descriptor with a bDevCapabilityType of
- * \ref libusb_capability_type::LIBUSB_BT_CONTAINER_ID
- * LIBUSB_BT_CONTAINER_ID
- * \param container_id output location for the Container ID descriptor.
- * Only valid if 0 was returned. Must be freed with
- * libusb_free_container_id_descriptor() after use.
- * \returns 0 on success
- * \returns a LIBUSB_ERROR code on error
- */
-int API_EXPORTED libusb_get_container_id_descriptor(struct libusb_context *ctx,
-	struct libusb_bos_dev_capability_descriptor *dev_cap,
-	struct libusb_container_id_descriptor **container_id)
-{
-	struct libusb_container_id_descriptor *_container_id;
-	const int host_endian = 0;
-
-	if (dev_cap->bDevCapabilityType != LIBUSB_BT_CONTAINER_ID) {
-		usbi_err(ctx, "unexpected bDevCapabilityType %x (expected %x)",
-			 dev_cap->bDevCapabilityType,
-			 LIBUSB_BT_CONTAINER_ID);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-	if (dev_cap->bLength < LIBUSB_BT_CONTAINER_ID_SIZE) {
-		usbi_err(ctx, "short dev-cap descriptor read %d/%d",
-			 dev_cap->bLength, LIBUSB_BT_CONTAINER_ID_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	_container_id = malloc(sizeof(*_container_id));
-	if (!_container_id)
-		return LIBUSB_ERROR_NO_MEM;
-
-	usbi_parse_descriptor((unsigned char *)dev_cap, "bbbbu",
-			      _container_id, host_endian);
-
-	*container_id = _container_id;
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup desc
- * Free a Container ID descriptor obtained from
- * libusb_get_container_id_descriptor().
- * It is safe to call this function with a NULL container_id parameter,
- * in which case the function simply returns.
- *
- * \param container_id the USB 2.0 Extension descriptor to free
- */
-void API_EXPORTED libusb_free_container_id_descriptor(
-	struct libusb_container_id_descriptor *container_id)
-{
-	free(container_id);
-}
-
-/** \ingroup desc
- * Retrieve a string descriptor in C style ASCII.
- *
- * Wrapper around libusb_get_string_descriptor(). Uses the first language
- * supported by the device.
- *
- * \param dev a device handle
- * \param desc_index the index of the descriptor to retrieve
- * \param data output buffer for ASCII string descriptor
- * \param length size of data buffer
- * \returns number of bytes returned in data, or LIBUSB_ERROR code on failure
- */
-int API_EXPORTED libusb_get_string_descriptor_ascii(libusb_device_handle *dev,
-	uint8_t desc_index, unsigned char *data, int length)
-{
-	unsigned char tbuf[255]; /* Some devices choke on size > 255 */
-	int r, si, di;
-	uint16_t langid;
-
-	/* Asking for the zero'th index is special - it returns a string
-	 * descriptor that contains all the language IDs supported by the
-	 * device. Typically there aren't many - often only one. Language
-	 * IDs are 16 bit numbers, and they start at the third byte in the
-	 * descriptor. There's also no point in trying to read descriptor 0
-	 * with this function. See USB 2.0 specification section 9.6.7 for
-	 * more information.
-	 */
-
-	if (desc_index == 0)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	r = libusb_get_string_descriptor(dev, 0, 0, tbuf, sizeof(tbuf));
-	if (r < 0)
-		return r;
-
-	if (r < 4)
-		return LIBUSB_ERROR_IO;
-
-	langid = tbuf[2] | (tbuf[3] << 8);
-
-	r = libusb_get_string_descriptor(dev, desc_index, langid, tbuf,
-		sizeof(tbuf));
-	if (r < 0)
-		return r;
-
-	if (tbuf[1] != LIBUSB_DT_STRING)
-		return LIBUSB_ERROR_IO;
-
-	if (tbuf[0] > r)
-		return LIBUSB_ERROR_IO;
-
-	for (di = 0, si = 2; si < tbuf[0]; si += 2) {
-		if (di >= (length - 1))
-			break;
-
-		if ((tbuf[si] & 0x80) || (tbuf[si + 1])) /* non-ASCII */
-			data[di++] = '?';
-		else
-			data[di++] = tbuf[si];
-	}
-
-	data[di] = 0;
-	return di;
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/hotplug.c b/src/3rd_party-static/libusbx-1.0.16/libusb/hotplug.c
deleted file mode 100644
index 6b04342f08..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/hotplug.c
+++ /dev/null
@@ -1,320 +0,0 @@
-/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
-/*
- * Hotplug functions for libusbx
- * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
- * Copyright © 2012-2013 Peter Stuge <peter@stuge.se>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <config.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-#include <assert.h>
-
-#include "libusbi.h"
-#include "hotplug.h"
-
-/**
- * @defgroup hotplug  Device hotplug event notification
- * This page details how to use the libusb hotplug interface, where available.
- *
- * Be mindful that not all platforms currently implement hotplug notification and
- * that you should first call on \ref libusb_has_capability() with parameter
- * \ref LIBUSB_CAP_HAS_HOTPLUG to confirm that hotplug support is available.
- *
- * \page hotplug Device hotplug event notification
- *
- * \section intro Introduction
- *
- * Version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102, has added support
- * for hotplug events on <b>some</b> platforms (you should test if your platform
- * supports hotplug notification by calling \ref libusb_has_capability() with
- * parameter \ref LIBUSB_CAP_HAS_HOTPLUG). 
- *
- * This interface allows you to request notification for the arrival and departure
- * of matching USB devices.
- *
- * To receive hotplug notification you register a callback by calling
- * \ref libusb_hotplug_register_callback(). This function will optionally return
- * a handle that can be passed to \ref libusb_hotplug_deregister_callback().
- *
- * A callback function must return an int (0 or 1) indicating whether the callback is
- * expecting additional events. Returning 0 will rearm the callback and 1 will cause
- * the callback to be deregistered.
- *
- * Callbacks for a particular context are automatically deregistered by libusb_exit().
- *
- * As of 1.0.16 there are two supported hotplug events:
- *  - LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED: A device has arrived and is ready to use
- *  - LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT: A device has left and is no longer available
- *
- * A hotplug event can listen for either or both of these events.
- *
- * Note: If you receive notification that a device has left and you have any
- * a libusb_device_handles for the device it is up to you to call libusb_close()
- * on each handle to free up any remaining resources associated with the device.
- * Once a device has left any libusb_device_handle associated with the device
- * are invalid and will remain so even if the device comes back.
- *
- * When handling a LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED event it is considered
- * safe to call any libusbx function that takes a libusb_device. On the other hand,
- * when handling a LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT event the only safe function
- * is libusb_get_device_descriptor().
- *
- * The following code provides an example of the usage of the hotplug interface:
-\code
-static int count = 0;
-
-int hotplug_callback(struct libusb_context *ctx, struct libusb_device *dev,
-                     libusb_hotplug_event event, void *user_data) {
-  static libusb_device_handle *handle = NULL;
-  struct libusb_device_descriptor desc;
-  int rc;
-
-  (void)libusb_get_device_descriptor(dev, &desc);
-
-  if (LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED == event) {
-    rc = libusb_open(dev, &handle);
-    if (LIBUSB_SUCCESS != rc) {
-      printf("Could not open USB device\n");
-    }
-  } else if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
-    if (handle) {
-      libusb_close(handle);
-      handle = NULL;
-    }
-  } else {
-    printf("Unhandled event %d\n", event);
-  }
-  count++;
-
-  return 0;
-}
-
-int main (void) {
-  libusb_hotplug_callback_handle handle;
-  int rc;
-
-  libusb_init(NULL);
-
-  rc = libusb_hotplug_register_callback(NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED |
-                                        LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, 0x045a, 0x5005,
-                                        LIBUSB_HOTPLUG_MATCH_ANY, hotplug_callback, NULL,
-                                        &handle);
-  if (LIBUSB_SUCCESS != rc) {
-    printf("Error creating a hotplug callback\n");
-    libusb_exit(NULL);
-    return EXIT_FAILURE;
-  }
-
-  while (count < 2) {
-    usleep(10000);
-  }
-
-  libusb_hotplug_deregister_callback(handle);
-  libusb_exit(NULL);
-
-  return 0;
-}
-\endcode
- */
-
-static int usbi_hotplug_match_cb (struct libusb_context *ctx,
-	struct libusb_device *dev, libusb_hotplug_event event,
-	struct libusb_hotplug_callback *hotplug_cb)
-{
-	/* Handle lazy deregistration of callback */
-	if (hotplug_cb->needs_free) {
-		/* Free callback */
-		return 1;
-	}
-
-	if (!(hotplug_cb->events & event)) {
-		return 0;
-	}
-
-	if (LIBUSB_HOTPLUG_MATCH_ANY != hotplug_cb->vendor_id &&
-	    hotplug_cb->vendor_id != dev->device_descriptor.idVendor) {
-		return 0;
-	}
-
-	if (LIBUSB_HOTPLUG_MATCH_ANY != hotplug_cb->product_id &&
-	    hotplug_cb->product_id != dev->device_descriptor.idProduct) {
-		return 0;
-	}
-
-	if (LIBUSB_HOTPLUG_MATCH_ANY != hotplug_cb->dev_class &&
-	    hotplug_cb->dev_class != dev->device_descriptor.bDeviceClass) {
-		return 0;
-	}
-
-	return hotplug_cb->cb (ctx == usbi_default_context ? NULL : ctx,
-			       dev, event, hotplug_cb->user_data);
-}
-
-void usbi_hotplug_match(struct libusb_context *ctx, struct libusb_device *dev,
-	libusb_hotplug_event event)
-{
-	struct libusb_hotplug_callback *hotplug_cb, *next;
-	int ret;
-
-	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
-
-	list_for_each_entry_safe(hotplug_cb, next, &ctx->hotplug_cbs, list, struct libusb_hotplug_callback) {
-		usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
-		ret = usbi_hotplug_match_cb (ctx, dev, event, hotplug_cb);
-		usbi_mutex_lock(&ctx->hotplug_cbs_lock);
-
-		if (ret) {
-			list_del(&hotplug_cb->list);
-			free(hotplug_cb);
-		}
-	}
-
-	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
-
-	/* loop through and disconnect all open handles for this device */
-	if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
-		struct libusb_device_handle *handle;
-
-		usbi_mutex_lock(&ctx->open_devs_lock);
-		list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
-			if (dev == handle->dev) {
-				usbi_handle_disconnect (handle);
-			}
-		}
-		usbi_mutex_unlock(&ctx->open_devs_lock);
-	}
-}
-
-int API_EXPORTED libusb_hotplug_register_callback(libusb_context *ctx,
-	libusb_hotplug_event events, libusb_hotplug_flag flags,
-	int vendor_id, int product_id, int dev_class,
-	libusb_hotplug_callback_fn cb_fn, void *user_data,
-	libusb_hotplug_callback_handle *handle)
-{
-	libusb_hotplug_callback *new_callback;
-	static int handle_id = 1;
-
-	/* check for hotplug support */
-	if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-	}
-
-	/* check for sane values */
-	if ((LIBUSB_HOTPLUG_MATCH_ANY != vendor_id && (~0xffff & vendor_id)) ||
-	    (LIBUSB_HOTPLUG_MATCH_ANY != product_id && (~0xffff & product_id)) ||
-	    (LIBUSB_HOTPLUG_MATCH_ANY != dev_class && (~0xff & dev_class)) ||
-	    !cb_fn) {
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	USBI_GET_CONTEXT(ctx);
-
-	new_callback = (libusb_hotplug_callback *)calloc(1, sizeof (*new_callback));
-	if (!new_callback) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	new_callback->ctx = ctx;
-	new_callback->vendor_id = vendor_id;
-	new_callback->product_id = product_id;
-	new_callback->dev_class = dev_class;
-	new_callback->flags = flags;
-	new_callback->events = events;
-	new_callback->cb = cb_fn;
-	new_callback->user_data = user_data;
-	new_callback->needs_free = 0;
-
-	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
-
-	/* protect the handle by the context hotplug lock. it doesn't matter if the same handle
-	 * is used for different contexts only that the handle is unique for this context */
-	new_callback->handle = handle_id++;
-
-	list_add(&new_callback->list, &ctx->hotplug_cbs);
-
-	if (flags & LIBUSB_HOTPLUG_ENUMERATE) {
-		struct libusb_device *dev;
-
-		usbi_mutex_lock(&ctx->usb_devs_lock);
-
-		list_for_each_entry(dev, &ctx->usb_devs, list, struct libusb_device) {
-			(void) usbi_hotplug_match_cb (ctx, dev, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, new_callback);
-		}
-
-		usbi_mutex_unlock(&ctx->usb_devs_lock);
-	}
-
-	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
-
-	if (handle) {
-		*handle = new_callback->handle;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-void API_EXPORTED libusb_hotplug_deregister_callback (struct libusb_context *ctx,
-	libusb_hotplug_callback_handle handle)
-{
-	struct libusb_hotplug_callback *hotplug_cb;
-	libusb_hotplug_message message;
-	ssize_t ret;
-
-	/* check for hotplug support */
-	if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
-		return;
-	}
-
-	USBI_GET_CONTEXT(ctx);
-
-	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
-	list_for_each_entry(hotplug_cb, &ctx->hotplug_cbs, list,
-			    struct libusb_hotplug_callback) {
-		if (handle == hotplug_cb->handle) {
-			/* Mark this callback for deregistration */
-			hotplug_cb->needs_free = 1;
-		}
-	}
-	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
-
-	/* wakeup handle_events to do the actual free */
-	memset(&message, 0, sizeof(message));
-	ret = usbi_write(ctx->hotplug_pipe[1], &message, sizeof(message));
-	if (sizeof(message) != ret) {
-		usbi_err(ctx, "error writing hotplug message");
-	}
-}
-
-void usbi_hotplug_deregister_all(struct libusb_context *ctx) {
-	struct libusb_hotplug_callback *hotplug_cb, *next;
-
-	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
-	list_for_each_entry_safe(hotplug_cb, next, &ctx->hotplug_cbs, list,
-				 struct libusb_hotplug_callback) {
-		list_del(&hotplug_cb->list);
-		free(hotplug_cb);
-	}
-
-	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/hotplug.h b/src/3rd_party-static/libusbx-1.0.16/libusb/hotplug.h
deleted file mode 100644
index 614ddbcff0..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/hotplug.h
+++ /dev/null
@@ -1,82 +0,0 @@
-/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
-/*
- * Hotplug support for libusbx
- * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
- * Copyright © 2012-2013 Peter Stuge <peter@stuge.se>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#if !defined(USBI_HOTPLUG_H)
-#define USBI_HOTPLUG_H
-
-#ifndef LIBUSBI_H
-#include "libusbi.h"
-#endif
-
-/** \ingroup hotplug
- * The hotplug callback structure. The user populates this structure with
- * libusb_hotplug_prepare_callback() and then calls libusb_hotplug_register_callback()
- * to receive notification of hotplug events.
- */
-struct libusb_hotplug_callback {
-	/** Context this callback is associated with */
-	struct libusb_context *ctx;
-
-	/** Vendor ID to match or LIBUSB_HOTPLUG_MATCH_ANY */
-	int vendor_id;
-
-	/** Product ID to match or LIBUSB_HOTPLUG_MATCH_ANY */
-	int product_id;
-
-	/** Device class to match or LIBUSB_HOTPLUG_MATCH_ANY */
-	int dev_class;
-
-	/** Hotplug callback flags */
-	libusb_hotplug_flag flags;
-
-	/** Event(s) that will trigger this callback */
-	libusb_hotplug_event events;
-
-	/** Callback function to invoke for matching event/device */
-	libusb_hotplug_callback_fn cb;
-
-	/** Handle for this callback (used to match on deregister) */
-	libusb_hotplug_callback_handle handle;
-
-	/** User data that will be passed to the callback function */
-	void *user_data;
-
-	/** Callback is marked for deletion */
-	int needs_free;
-
-	/** List this callback is registered in (ctx->hotplug_cbs) */
-	struct list_head list;
-};
-
-typedef struct libusb_hotplug_callback libusb_hotplug_callback;
-
-struct libusb_hotplug_message {
-	libusb_hotplug_event event;
-	struct libusb_device *device;
-};
-
-typedef struct libusb_hotplug_message libusb_hotplug_message;
-
-void usbi_hotplug_deregister_all(struct libusb_context *ctx);
-void usbi_hotplug_match(struct libusb_context *ctx, struct libusb_device *dev,
-			libusb_hotplug_event event);
-
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/io.c b/src/3rd_party-static/libusbx-1.0.16/libusb/io.c
deleted file mode 100644
index 4368b99457..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/io.c
+++ /dev/null
@@ -1,2566 +0,0 @@
-/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
-/*
- * I/O functions for libusbx
- * Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-#include <errno.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#ifdef HAVE_SIGNAL_H
-#include <signal.h>
-#endif
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
-#ifdef USBI_TIMERFD_AVAILABLE
-#include <sys/timerfd.h>
-#endif
-
-#include "libusbi.h"
-#include "hotplug.h"
-
-/**
- * \page io Synchronous and asynchronous device I/O
- *
- * \section intro Introduction
- *
- * If you're using libusbx in your application, you're probably wanting to
- * perform I/O with devices - you want to perform USB data transfers.
- *
- * libusbx offers two separate interfaces for device I/O. This page aims to
- * introduce the two in order to help you decide which one is more suitable
- * for your application. You can also choose to use both interfaces in your
- * application by considering each transfer on a case-by-case basis.
- *
- * Once you have read through the following discussion, you should consult the
- * detailed API documentation pages for the details:
- * - \ref syncio
- * - \ref asyncio
- *
- * \section theory Transfers at a logical level
- *
- * At a logical level, USB transfers typically happen in two parts. For
- * example, when reading data from a endpoint:
- * -# A request for data is sent to the device
- * -# Some time later, the incoming data is received by the host
- *
- * or when writing data to an endpoint:
- *
- * -# The data is sent to the device
- * -# Some time later, the host receives acknowledgement from the device that
- *    the data has been transferred.
- *
- * There may be an indefinite delay between the two steps. Consider a
- * fictional USB input device with a button that the user can press. In order
- * to determine when the button is pressed, you would likely submit a request
- * to read data on a bulk or interrupt endpoint and wait for data to arrive.
- * Data will arrive when the button is pressed by the user, which is
- * potentially hours later.
- *
- * libusbx offers both a synchronous and an asynchronous interface to performing
- * USB transfers. The main difference is that the synchronous interface
- * combines both steps indicated above into a single function call, whereas
- * the asynchronous interface separates them.
- *
- * \section sync The synchronous interface
- *
- * The synchronous I/O interface allows you to perform a USB transfer with
- * a single function call. When the function call returns, the transfer has
- * completed and you can parse the results.
- *
- * If you have used the libusb-0.1 before, this I/O style will seem familar to
- * you. libusb-0.1 only offered a synchronous interface.
- *
- * In our input device example, to read button presses you might write code
- * in the following style:
-\code
-unsigned char data[4];
-int actual_length;
-int r = libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_IN, data, sizeof(data), &actual_length, 0);
-if (r == 0 && actual_length == sizeof(data)) {
-	// results of the transaction can now be found in the data buffer
-	// parse them here and report button press
-} else {
-	error();
-}
-\endcode
- *
- * The main advantage of this model is simplicity: you did everything with
- * a single simple function call.
- *
- * However, this interface has its limitations. Your application will sleep
- * inside libusb_bulk_transfer() until the transaction has completed. If it
- * takes the user 3 hours to press the button, your application will be
- * sleeping for that long. Execution will be tied up inside the library -
- * the entire thread will be useless for that duration.
- *
- * Another issue is that by tieing up the thread with that single transaction
- * there is no possibility of performing I/O with multiple endpoints and/or
- * multiple devices simultaneously, unless you resort to creating one thread
- * per transaction.
- *
- * Additionally, there is no opportunity to cancel the transfer after the
- * request has been submitted.
- *
- * For details on how to use the synchronous API, see the
- * \ref syncio "synchronous I/O API documentation" pages.
- *
- * \section async The asynchronous interface
- *
- * Asynchronous I/O is the most significant new feature in libusb-1.0.
- * Although it is a more complex interface, it solves all the issues detailed
- * above.
- *
- * Instead of providing which functions that block until the I/O has complete,
- * libusbx's asynchronous interface presents non-blocking functions which
- * begin a transfer and then return immediately. Your application passes a
- * callback function pointer to this non-blocking function, which libusbx will
- * call with the results of the transaction when it has completed.
- *
- * Transfers which have been submitted through the non-blocking functions
- * can be cancelled with a separate function call.
- *
- * The non-blocking nature of this interface allows you to be simultaneously
- * performing I/O to multiple endpoints on multiple devices, without having
- * to use threads.
- *
- * This added flexibility does come with some complications though:
- * - In the interest of being a lightweight library, libusbx does not create
- * threads and can only operate when your application is calling into it. Your
- * application must call into libusbx from it's main loop when events are ready
- * to be handled, or you must use some other scheme to allow libusbx to
- * undertake whatever work needs to be done.
- * - libusbx also needs to be called into at certain fixed points in time in
- * order to accurately handle transfer timeouts.
- * - Memory handling becomes more complex. You cannot use stack memory unless
- * the function with that stack is guaranteed not to return until the transfer
- * callback has finished executing.
- * - You generally lose some linearity from your code flow because submitting
- * the transfer request is done in a separate function from where the transfer
- * results are handled. This becomes particularly obvious when you want to
- * submit a second transfer based on the results of an earlier transfer.
- *
- * Internally, libusbx's synchronous interface is expressed in terms of function
- * calls to the asynchronous interface.
- *
- * For details on how to use the asynchronous API, see the
- * \ref asyncio "asynchronous I/O API" documentation pages.
- */
-
-
-/**
- * \page packetoverflow Packets and overflows
- *
- * \section packets Packet abstraction
- *
- * The USB specifications describe how data is transmitted in packets, with
- * constraints on packet size defined by endpoint descriptors. The host must
- * not send data payloads larger than the endpoint's maximum packet size.
- *
- * libusbx and the underlying OS abstract out the packet concept, allowing you
- * to request transfers of any size. Internally, the request will be divided
- * up into correctly-sized packets. You do not have to be concerned with
- * packet sizes, but there is one exception when considering overflows.
- *
- * \section overflow Bulk/interrupt transfer overflows
- *
- * When requesting data on a bulk endpoint, libusbx requires you to supply a
- * buffer and the maximum number of bytes of data that libusbx can put in that
- * buffer. However, the size of the buffer is not communicated to the device -
- * the device is just asked to send any amount of data.
- *
- * There is no problem if the device sends an amount of data that is less than
- * or equal to the buffer size. libusbx reports this condition to you through
- * the \ref libusb_transfer::actual_length "libusb_transfer.actual_length"
- * field.
- *
- * Problems may occur if the device attempts to send more data than can fit in
- * the buffer. libusbx reports LIBUSB_TRANSFER_OVERFLOW for this condition but
- * other behaviour is largely undefined: actual_length may or may not be
- * accurate, the chunk of data that can fit in the buffer (before overflow)
- * may or may not have been transferred.
- *
- * Overflows are nasty, but can be avoided. Even though you were told to
- * ignore packets above, think about the lower level details: each transfer is
- * split into packets (typically small, with a maximum size of 512 bytes).
- * Overflows can only happen if the final packet in an incoming data transfer
- * is smaller than the actual packet that the device wants to transfer.
- * Therefore, you will never see an overflow if your transfer buffer size is a
- * multiple of the endpoint's packet size: the final packet will either
- * fill up completely or will be only partially filled.
- */
-
-/**
- * @defgroup asyncio Asynchronous device I/O
- *
- * This page details libusbx's asynchronous (non-blocking) API for USB device
- * I/O. This interface is very powerful but is also quite complex - you will
- * need to read this page carefully to understand the necessary considerations
- * and issues surrounding use of this interface. Simplistic applications
- * may wish to consider the \ref syncio "synchronous I/O API" instead.
- *
- * The asynchronous interface is built around the idea of separating transfer
- * submission and handling of transfer completion (the synchronous model
- * combines both of these into one). There may be a long delay between
- * submission and completion, however the asynchronous submission function
- * is non-blocking so will return control to your application during that
- * potentially long delay.
- *
- * \section asyncabstraction Transfer abstraction
- *
- * For the asynchronous I/O, libusbx implements the concept of a generic
- * transfer entity for all types of I/O (control, bulk, interrupt,
- * isochronous). The generic transfer object must be treated slightly
- * differently depending on which type of I/O you are performing with it.
- *
- * This is represented by the public libusb_transfer structure type.
- *
- * \section asynctrf Asynchronous transfers
- *
- * We can view asynchronous I/O as a 5 step process:
- * -# <b>Allocation</b>: allocate a libusb_transfer
- * -# <b>Filling</b>: populate the libusb_transfer instance with information
- *    about the transfer you wish to perform
- * -# <b>Submission</b>: ask libusbx to submit the transfer
- * -# <b>Completion handling</b>: examine transfer results in the
- *    libusb_transfer structure
- * -# <b>Deallocation</b>: clean up resources
- *
- *
- * \subsection asyncalloc Allocation
- *
- * This step involves allocating memory for a USB transfer. This is the
- * generic transfer object mentioned above. At this stage, the transfer
- * is "blank" with no details about what type of I/O it will be used for.
- *
- * Allocation is done with the libusb_alloc_transfer() function. You must use
- * this function rather than allocating your own transfers.
- *
- * \subsection asyncfill Filling
- *
- * This step is where you take a previously allocated transfer and fill it
- * with information to determine the message type and direction, data buffer,
- * callback function, etc.
- *
- * You can either fill the required fields yourself or you can use the
- * helper functions: libusb_fill_control_transfer(), libusb_fill_bulk_transfer()
- * and libusb_fill_interrupt_transfer().
- *
- * \subsection asyncsubmit Submission
- *
- * When you have allocated a transfer and filled it, you can submit it using
- * libusb_submit_transfer(). This function returns immediately but can be
- * regarded as firing off the I/O request in the background.
- *
- * \subsection asynccomplete Completion handling
- *
- * After a transfer has been submitted, one of four things can happen to it:
- *
- * - The transfer completes (i.e. some data was transferred)
- * - The transfer has a timeout and the timeout expires before all data is
- * transferred
- * - The transfer fails due to an error
- * - The transfer is cancelled
- *
- * Each of these will cause the user-specified transfer callback function to
- * be invoked. It is up to the callback function to determine which of the
- * above actually happened and to act accordingly.
- *
- * The user-specified callback is passed a pointer to the libusb_transfer
- * structure which was used to setup and submit the transfer. At completion
- * time, libusbx has populated this structure with results of the transfer:
- * success or failure reason, number of bytes of data transferred, etc. See
- * the libusb_transfer structure documentation for more information.
- *
- * \subsection Deallocation
- *
- * When a transfer has completed (i.e. the callback function has been invoked),
- * you are advised to free the transfer (unless you wish to resubmit it, see
- * below). Transfers are deallocated with libusb_free_transfer().
- *
- * It is undefined behaviour to free a transfer which has not completed.
- *
- * \section asyncresubmit Resubmission
- *
- * You may be wondering why allocation, filling, and submission are all
- * separated above where they could reasonably be combined into a single
- * operation.
- *
- * The reason for separation is to allow you to resubmit transfers without
- * having to allocate new ones every time. This is especially useful for
- * common situations dealing with interrupt endpoints - you allocate one
- * transfer, fill and submit it, and when it returns with results you just
- * resubmit it for the next interrupt.
- *
- * \section asynccancel Cancellation
- *
- * Another advantage of using the asynchronous interface is that you have
- * the ability to cancel transfers which have not yet completed. This is
- * done by calling the libusb_cancel_transfer() function.
- *
- * libusb_cancel_transfer() is asynchronous/non-blocking in itself. When the
- * cancellation actually completes, the transfer's callback function will
- * be invoked, and the callback function should check the transfer status to
- * determine that it was cancelled.
- *
- * Freeing the transfer after it has been cancelled but before cancellation
- * has completed will result in undefined behaviour.
- *
- * When a transfer is cancelled, some of the data may have been transferred.
- * libusbx will communicate this to you in the transfer callback. Do not assume
- * that no data was transferred.
- *
- * \section bulk_overflows Overflows on device-to-host bulk/interrupt endpoints
- *
- * If your device does not have predictable transfer sizes (or it misbehaves),
- * your application may submit a request for data on an IN endpoint which is
- * smaller than the data that the device wishes to send. In some circumstances
- * this will cause an overflow, which is a nasty condition to deal with. See
- * the \ref packetoverflow page for discussion.
- *
- * \section asyncctrl Considerations for control transfers
- *
- * The <tt>libusb_transfer</tt> structure is generic and hence does not
- * include specific fields for the control-specific setup packet structure.
- *
- * In order to perform a control transfer, you must place the 8-byte setup
- * packet at the start of the data buffer. To simplify this, you could
- * cast the buffer pointer to type struct libusb_control_setup, or you can
- * use the helper function libusb_fill_control_setup().
- *
- * The wLength field placed in the setup packet must be the length you would
- * expect to be sent in the setup packet: the length of the payload that
- * follows (or the expected maximum number of bytes to receive). However,
- * the length field of the libusb_transfer object must be the length of
- * the data buffer - i.e. it should be wLength <em>plus</em> the size of
- * the setup packet (LIBUSB_CONTROL_SETUP_SIZE).
- *
- * If you use the helper functions, this is simplified for you:
- * -# Allocate a buffer of size LIBUSB_CONTROL_SETUP_SIZE plus the size of the
- * data you are sending/requesting.
- * -# Call libusb_fill_control_setup() on the data buffer, using the transfer
- * request size as the wLength value (i.e. do not include the extra space you
- * allocated for the control setup).
- * -# If this is a host-to-device transfer, place the data to be transferred
- * in the data buffer, starting at offset LIBUSB_CONTROL_SETUP_SIZE.
- * -# Call libusb_fill_control_transfer() to associate the data buffer with
- * the transfer (and to set the remaining details such as callback and timeout).
- *   - Note that there is no parameter to set the length field of the transfer.
- *     The length is automatically inferred from the wLength field of the setup
- *     packet.
- * -# Submit the transfer.
- *
- * The multi-byte control setup fields (wValue, wIndex and wLength) must
- * be given in little-endian byte order (the endianness of the USB bus).
- * Endianness conversion is transparently handled by
- * libusb_fill_control_setup() which is documented to accept host-endian
- * values.
- *
- * Further considerations are needed when handling transfer completion in
- * your callback function:
- * - As you might expect, the setup packet will still be sitting at the start
- * of the data buffer.
- * - If this was a device-to-host transfer, the received data will be sitting
- * at offset LIBUSB_CONTROL_SETUP_SIZE into the buffer.
- * - The actual_length field of the transfer structure is relative to the
- * wLength of the setup packet, rather than the size of the data buffer. So,
- * if your wLength was 4, your transfer's <tt>length</tt> was 12, then you
- * should expect an <tt>actual_length</tt> of 4 to indicate that the data was
- * transferred in entirity.
- *
- * To simplify parsing of setup packets and obtaining the data from the
- * correct offset, you may wish to use the libusb_control_transfer_get_data()
- * and libusb_control_transfer_get_setup() functions within your transfer
- * callback.
- *
- * Even though control endpoints do not halt, a completed control transfer
- * may have a LIBUSB_TRANSFER_STALL status code. This indicates the control
- * request was not supported.
- *
- * \section asyncintr Considerations for interrupt transfers
- *
- * All interrupt transfers are performed using the polling interval presented
- * by the bInterval value of the endpoint descriptor.
- *
- * \section asynciso Considerations for isochronous transfers
- *
- * Isochronous transfers are more complicated than transfers to
- * non-isochronous endpoints.
- *
- * To perform I/O to an isochronous endpoint, allocate the transfer by calling
- * libusb_alloc_transfer() with an appropriate number of isochronous packets.
- *
- * During filling, set \ref libusb_transfer::type "type" to
- * \ref libusb_transfer_type::LIBUSB_TRANSFER_TYPE_ISOCHRONOUS
- * "LIBUSB_TRANSFER_TYPE_ISOCHRONOUS", and set
- * \ref libusb_transfer::num_iso_packets "num_iso_packets" to a value less than
- * or equal to the number of packets you requested during allocation.
- * libusb_alloc_transfer() does not set either of these fields for you, given
- * that you might not even use the transfer on an isochronous endpoint.
- *
- * Next, populate the length field for the first num_iso_packets entries in
- * the \ref libusb_transfer::iso_packet_desc "iso_packet_desc" array. Section
- * 5.6.3 of the USB2 specifications describe how the maximum isochronous
- * packet length is determined by the wMaxPacketSize field in the endpoint
- * descriptor.
- * Two functions can help you here:
- *
- * - libusb_get_max_iso_packet_size() is an easy way to determine the max
- *   packet size for an isochronous endpoint. Note that the maximum packet
- *   size is actually the maximum number of bytes that can be transmitted in
- *   a single microframe, therefore this function multiplies the maximum number
- *   of bytes per transaction by the number of transaction opportunities per
- *   microframe.
- * - libusb_set_iso_packet_lengths() assigns the same length to all packets
- *   within a transfer, which is usually what you want.
- *
- * For outgoing transfers, you'll obviously fill the buffer and populate the
- * packet descriptors in hope that all the data gets transferred. For incoming
- * transfers, you must ensure the buffer has sufficient capacity for
- * the situation where all packets transfer the full amount of requested data.
- *
- * Completion handling requires some extra consideration. The
- * \ref libusb_transfer::actual_length "actual_length" field of the transfer
- * is meaningless and should not be examined; instead you must refer to the
- * \ref libusb_iso_packet_descriptor::actual_length "actual_length" field of
- * each individual packet.
- *
- * The \ref libusb_transfer::status "status" field of the transfer is also a
- * little misleading:
- *  - If the packets were submitted and the isochronous data microframes
- *    completed normally, status will have value
- *    \ref libusb_transfer_status::LIBUSB_TRANSFER_COMPLETED
- *    "LIBUSB_TRANSFER_COMPLETED". Note that bus errors and software-incurred
- *    delays are not counted as transfer errors; the transfer.status field may
- *    indicate COMPLETED even if some or all of the packets failed. Refer to
- *    the \ref libusb_iso_packet_descriptor::status "status" field of each
- *    individual packet to determine packet failures.
- *  - The status field will have value
- *    \ref libusb_transfer_status::LIBUSB_TRANSFER_ERROR
- *    "LIBUSB_TRANSFER_ERROR" only when serious errors were encountered.
- *  - Other transfer status codes occur with normal behaviour.
- *
- * The data for each packet will be found at an offset into the buffer that
- * can be calculated as if each prior packet completed in full. The
- * libusb_get_iso_packet_buffer() and libusb_get_iso_packet_buffer_simple()
- * functions may help you here.
- *
- * \section asyncmem Memory caveats
- *
- * In most circumstances, it is not safe to use stack memory for transfer
- * buffers. This is because the function that fired off the asynchronous
- * transfer may return before libusbx has finished using the buffer, and when
- * the function returns it's stack gets destroyed. This is true for both
- * host-to-device and device-to-host transfers.
- *
- * The only case in which it is safe to use stack memory is where you can
- * guarantee that the function owning the stack space for the buffer does not
- * return until after the transfer's callback function has completed. In every
- * other case, you need to use heap memory instead.
- *
- * \section asyncflags Fine control
- *
- * Through using this asynchronous interface, you may find yourself repeating
- * a few simple operations many times. You can apply a bitwise OR of certain
- * flags to a transfer to simplify certain things:
- * - \ref libusb_transfer_flags::LIBUSB_TRANSFER_SHORT_NOT_OK
- *   "LIBUSB_TRANSFER_SHORT_NOT_OK" results in transfers which transferred
- *   less than the requested amount of data being marked with status
- *   \ref libusb_transfer_status::LIBUSB_TRANSFER_ERROR "LIBUSB_TRANSFER_ERROR"
- *   (they would normally be regarded as COMPLETED)
- * - \ref libusb_transfer_flags::LIBUSB_TRANSFER_FREE_BUFFER
- *   "LIBUSB_TRANSFER_FREE_BUFFER" allows you to ask libusbx to free the transfer
- *   buffer when freeing the transfer.
- * - \ref libusb_transfer_flags::LIBUSB_TRANSFER_FREE_TRANSFER
- *   "LIBUSB_TRANSFER_FREE_TRANSFER" causes libusbx to automatically free the
- *   transfer after the transfer callback returns.
- *
- * \section asyncevent Event handling
- *
- * An asynchronous model requires that libusbx perform work at various
- * points in time - namely processing the results of previously-submitted
- * transfers and invoking the user-supplied callback function.
- *
- * This gives rise to the libusb_handle_events() function which your
- * application must call into when libusbx has work do to. This gives libusbx
- * the opportunity to reap pending transfers, invoke callbacks, etc.
- *
- * There are 2 different approaches to dealing with libusb_handle_events:
- *
- * -# Repeatedly call libusb_handle_events() in blocking mode from a dedicated
- *    thread.
- * -# Integrate libusbx with your application's main event loop. libusbx
- *    exposes a set of file descriptors which allow you to do this.
- *
- * The first approach has the big advantage that it will also work on Windows
- * were libusbx' poll API for select / poll integration is not available. So
- * if you want to support Windows and use the async API, you must use this
- * approach, see the \ref eventthread "Using an event handling thread" section
- * below for details.
- *
- * If you prefer a single threaded approach with a single central event loop,
- * see the \ref poll "polling and timing" section for how to integrate libusbx
- * into your application's main event loop.
- *
- * \section eventthread Using an event handling thread
- *
- * Lets begin with stating the obvious: If you're going to use a separate
- * thread for libusbx event handling, your callback functions MUST be
- * threadsafe.
- *
- * Other then that doing event handling from a separate thread, is mostly
- * simple. You can use an event thread function as follows:
-\code
-void *event_thread_func(void *ctx)
-{
-    while (event_thread_run)
-        libusb_handle_events(ctx);
-
-    return NULL;
-}
-\endcode
- *
- * There is one caveat though, stopping this thread requires setting the
- * event_thread_run variable to 0, and after that libusb_handle_events() needs
- * to return control to event_thread_func. But unless some event happens,
- * libusb_handle_events() will not return.
- *
- * There are 2 different ways of dealing with this, depending on if your
- * application uses libusbx' \ref hotplug "hotplug" support or not.
- *
- * Applications which do not use hotplug support, should not start the event
- * thread until after their first call to libusb_open(), and should stop the
- * thread when closing the last open device as follows:
-\code
-void my_close_handle(libusb_device_handle *handle)
-{
-    if (open_devs == 1)
-        event_thread_run = 0;
-
-    libusb_close(handle); // This wakes up libusb_handle_events()
-
-    if (open_devs == 1)
-        pthread_join(event_thread);
-
-    open_devs--;
-}
-\endcode
- *
- * Applications using hotplug support should start the thread at program init,
- * after having successfully called libusb_hotplug_register_callback(), and
- * should stop the thread at program exit as follows:
-\code
-void my_libusb_exit(void)
-{ 
-    event_thread_run = 0;
-    libusb_hotplug_deregister_callback(ctx, hotplug_cb_handle); // This wakes up libusb_handle_events()
-    pthread_join(event_thread);
-    libusb_exit(ctx);
-}
-\endcode
- */
-
-/**
- * @defgroup poll Polling and timing
- *
- * This page documents libusbx's functions for polling events and timing.
- * These functions are only necessary for users of the
- * \ref asyncio "asynchronous API". If you are only using the simpler
- * \ref syncio "synchronous API" then you do not need to ever call these
- * functions.
- *
- * The justification for the functionality described here has already been
- * discussed in the \ref asyncevent "event handling" section of the
- * asynchronous API documentation. In summary, libusbx does not create internal
- * threads for event processing and hence relies on your application calling
- * into libusbx at certain points in time so that pending events can be handled.
- *
- * Your main loop is probably already calling poll() or select() or a
- * variant on a set of file descriptors for other event sources (e.g. keyboard
- * button presses, mouse movements, network sockets, etc). You then add
- * libusbx's file descriptors to your poll()/select() calls, and when activity
- * is detected on such descriptors you know it is time to call
- * libusb_handle_events().
- *
- * There is one final event handling complication. libusbx supports
- * asynchronous transfers which time out after a specified time period.
- *
- * On some platforms a timerfd is used, so the timeout handling is just another
- * fd, on other platforms this requires that libusbx is called into at or after
- * the timeout to handle it. So, in addition to considering libusbx's file
- * descriptors in your main event loop, you must also consider that libusbx
- * sometimes needs to be called into at fixed points in time even when there
- * is no file descriptor activity, see \ref polltime details.
- * 
- * In order to know precisely when libusbx needs to be called into, libusbx
- * offers you a set of pollable file descriptors and information about when
- * the next timeout expires.
- *
- * If you are using the asynchronous I/O API, you must take one of the two
- * following options, otherwise your I/O will not complete.
- *
- * \section pollsimple The simple option
- *
- * If your application revolves solely around libusbx and does not need to
- * handle other event sources, you can have a program structure as follows:
-\code
-// initialize libusbx
-// find and open device
-// maybe fire off some initial async I/O
-
-while (user_has_not_requested_exit)
-	libusb_handle_events(ctx);
-
-// clean up and exit
-\endcode
- *
- * With such a simple main loop, you do not have to worry about managing
- * sets of file descriptors or handling timeouts. libusb_handle_events() will
- * handle those details internally.
- *
- * \section pollmain The more advanced option
- *
- * \note This functionality is currently only available on Unix-like platforms.
- * On Windows, libusb_get_pollfds() simply returns NULL. Applications which
- * want to support Windows are advised to use an \ref eventthread
- * "event handling thread" instead.
- *
- * In more advanced applications, you will already have a main loop which
- * is monitoring other event sources: network sockets, X11 events, mouse
- * movements, etc. Through exposing a set of file descriptors, libusbx is
- * designed to cleanly integrate into such main loops.
- *
- * In addition to polling file descriptors for the other event sources, you
- * take a set of file descriptors from libusbx and monitor those too. When you
- * detect activity on libusbx's file descriptors, you call
- * libusb_handle_events_timeout() in non-blocking mode.
- *
- * What's more, libusbx may also need to handle events at specific moments in
- * time. No file descriptor activity is generated at these times, so your
- * own application needs to be continually aware of when the next one of these
- * moments occurs (through calling libusb_get_next_timeout()), and then it
- * needs to call libusb_handle_events_timeout() in non-blocking mode when
- * these moments occur. This means that you need to adjust your
- * poll()/select() timeout accordingly.
- *
- * libusbx provides you with a set of file descriptors to poll and expects you
- * to poll all of them, treating them as a single entity. The meaning of each
- * file descriptor in the set is an internal implementation detail,
- * platform-dependent and may vary from release to release. Don't try and
- * interpret the meaning of the file descriptors, just do as libusbx indicates,
- * polling all of them at once.
- *
- * In pseudo-code, you want something that looks like:
-\code
-// initialise libusbx
-
-libusb_get_pollfds(ctx)
-while (user has not requested application exit) {
-	libusb_get_next_timeout(ctx);
-	poll(on libusbx file descriptors plus any other event sources of interest,
-		using a timeout no larger than the value libusbx just suggested)
-	if (poll() indicated activity on libusbx file descriptors)
-		libusb_handle_events_timeout(ctx, &zero_tv);
-	if (time has elapsed to or beyond the libusbx timeout)
-		libusb_handle_events_timeout(ctx, &zero_tv);
-	// handle events from other sources here
-}
-
-// clean up and exit
-\endcode
- *
- * \subsection polltime Notes on time-based events
- *
- * The above complication with having to track time and call into libusbx at
- * specific moments is a bit of a headache. For maximum compatibility, you do
- * need to write your main loop as above, but you may decide that you can
- * restrict the supported platforms of your application and get away with
- * a more simplistic scheme.
- *
- * These time-based event complications are \b not required on the following
- * platforms:
- *  - Darwin
- *  - Linux, provided that the following version requirements are satisfied:
- *   - Linux v2.6.27 or newer, compiled with timerfd support
- *   - glibc v2.9 or newer
- *   - libusbx v1.0.5 or newer
- *
- * Under these configurations, libusb_get_next_timeout() will \em always return
- * 0, so your main loop can be simplified to:
-\code
-// initialise libusbx
-
-libusb_get_pollfds(ctx)
-while (user has not requested application exit) {
-	poll(on libusbx file descriptors plus any other event sources of interest,
-		using any timeout that you like)
-	if (poll() indicated activity on libusbx file descriptors)
-		libusb_handle_events_timeout(ctx, &zero_tv);
-	// handle events from other sources here
-}
-
-// clean up and exit
-\endcode
- *
- * Do remember that if you simplify your main loop to the above, you will
- * lose compatibility with some platforms (including legacy Linux platforms,
- * and <em>any future platforms supported by libusbx which may have time-based
- * event requirements</em>). The resultant problems will likely appear as
- * strange bugs in your application.
- *
- * You can use the libusb_pollfds_handle_timeouts() function to do a runtime
- * check to see if it is safe to ignore the time-based event complications.
- * If your application has taken the shortcut of ignoring libusbx's next timeout
- * in your main loop, then you are advised to check the return value of
- * libusb_pollfds_handle_timeouts() during application startup, and to abort
- * if the platform does suffer from these timing complications.
- *
- * \subsection fdsetchange Changes in the file descriptor set
- *
- * The set of file descriptors that libusbx uses as event sources may change
- * during the life of your application. Rather than having to repeatedly
- * call libusb_get_pollfds(), you can set up notification functions for when
- * the file descriptor set changes using libusb_set_pollfd_notifiers().
- *
- * \subsection mtissues Multi-threaded considerations
- *
- * Unfortunately, the situation is complicated further when multiple threads
- * come into play. If two threads are monitoring the same file descriptors,
- * the fact that only one thread will be woken up when an event occurs causes
- * some headaches.
- *
- * The events lock, event waiters lock, and libusb_handle_events_locked()
- * entities are added to solve these problems. You do not need to be concerned
- * with these entities otherwise.
- *
- * See the extra documentation: \ref mtasync
- */
-
-/** \page mtasync Multi-threaded applications and asynchronous I/O
- *
- * libusbx is a thread-safe library, but extra considerations must be applied
- * to applications which interact with libusbx from multiple threads.
- *
- * The underlying issue that must be addressed is that all libusbx I/O
- * revolves around monitoring file descriptors through the poll()/select()
- * system calls. This is directly exposed at the
- * \ref asyncio "asynchronous interface" but it is important to note that the
- * \ref syncio "synchronous interface" is implemented on top of the
- * asynchonrous interface, therefore the same considerations apply.
- *
- * The issue is that if two or more threads are concurrently calling poll()
- * or select() on libusbx's file descriptors then only one of those threads
- * will be woken up when an event arrives. The others will be completely
- * oblivious that anything has happened.
- *
- * Consider the following pseudo-code, which submits an asynchronous transfer
- * then waits for its completion. This style is one way you could implement a
- * synchronous interface on top of the asynchronous interface (and libusbx
- * does something similar, albeit more advanced due to the complications
- * explained on this page).
- *
-\code
-void cb(struct libusb_transfer *transfer)
-{
-	int *completed = transfer->user_data;
-	*completed = 1;
-}
-
-void myfunc() {
-	struct libusb_transfer *transfer;
-	unsigned char buffer[LIBUSB_CONTROL_SETUP_SIZE];
-	int completed = 0;
-
-	transfer = libusb_alloc_transfer(0);
-	libusb_fill_control_setup(buffer,
-		LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT, 0x04, 0x01, 0, 0);
-	libusb_fill_control_transfer(transfer, dev, buffer, cb, &completed, 1000);
-	libusb_submit_transfer(transfer);
-
-	while (!completed) {
-		poll(libusbx file descriptors, 120*1000);
-		if (poll indicates activity)
-			libusb_handle_events_timeout(ctx, &zero_tv);
-	}
-	printf("completed!");
-	// other code here
-}
-\endcode
- *
- * Here we are <em>serializing</em> completion of an asynchronous event
- * against a condition - the condition being completion of a specific transfer.
- * The poll() loop has a long timeout to minimize CPU usage during situations
- * when nothing is happening (it could reasonably be unlimited).
- *
- * If this is the only thread that is polling libusbx's file descriptors, there
- * is no problem: there is no danger that another thread will swallow up the
- * event that we are interested in. On the other hand, if there is another
- * thread polling the same descriptors, there is a chance that it will receive
- * the event that we were interested in. In this situation, <tt>myfunc()</tt>
- * will only realise that the transfer has completed on the next iteration of
- * the loop, <em>up to 120 seconds later.</em> Clearly a two-minute delay is
- * undesirable, and don't even think about using short timeouts to circumvent
- * this issue!
- *
- * The solution here is to ensure that no two threads are ever polling the
- * file descriptors at the same time. A naive implementation of this would
- * impact the capabilities of the library, so libusbx offers the scheme
- * documented below to ensure no loss of functionality.
- *
- * Before we go any further, it is worth mentioning that all libusb-wrapped
- * event handling procedures fully adhere to the scheme documented below.
- * This includes libusb_handle_events() and its variants, and all the
- * synchronous I/O functions - libusbx hides this headache from you.
- *
- * \section Using libusb_handle_events() from multiple threads
- *
- * Even when only using libusb_handle_events() and synchronous I/O functions,
- * you can still have a race condition. You might be tempted to solve the
- * above with libusb_handle_events() like so:
- *
-\code
-	libusb_submit_transfer(transfer);
-
-	while (!completed) {
-		libusb_handle_events(ctx);
-	}
-	printf("completed!");
-\endcode
- *
- * This however has a race between the checking of completed and
- * libusb_handle_events() acquiring the events lock, so another thread
- * could have completed the transfer, resulting in this thread hanging
- * until either a timeout or another event occurs. See also commit
- * 6696512aade99bb15d6792af90ae329af270eba6 which fixes this in the
- * synchronous API implementation of libusb.
- *
- * Fixing this race requires checking the variable completed only after
- * taking the event lock, which defeats the concept of just calling
- * libusb_handle_events() without worrying about locking. This is why
- * libusb-1.0.9 introduces the new libusb_handle_events_timeout_completed()
- * and libusb_handle_events_completed() functions, which handles doing the
- * completion check for you after they have acquired the lock:
- *
-\code
-	libusb_submit_transfer(transfer);
-
-	while (!completed) {
-		libusb_handle_events_completed(ctx, &completed);
-	}
-	printf("completed!");
-\endcode
- *
- * This nicely fixes the race in our example. Note that if all you want to
- * do is submit a single transfer and wait for its completion, then using
- * one of the synchronous I/O functions is much easier.
- *
- * \section eventlock The events lock
- *
- * The problem is when we consider the fact that libusbx exposes file
- * descriptors to allow for you to integrate asynchronous USB I/O into
- * existing main loops, effectively allowing you to do some work behind
- * libusbx's back. If you do take libusbx's file descriptors and pass them to
- * poll()/select() yourself, you need to be aware of the associated issues.
- *
- * The first concept to be introduced is the events lock. The events lock
- * is used to serialize threads that want to handle events, such that only
- * one thread is handling events at any one time.
- *
- * You must take the events lock before polling libusbx file descriptors,
- * using libusb_lock_events(). You must release the lock as soon as you have
- * aborted your poll()/select() loop, using libusb_unlock_events().
- *
- * \section threadwait Letting other threads do the work for you
- *
- * Although the events lock is a critical part of the solution, it is not
- * enough on it's own. You might wonder if the following is sufficient...
-\code
-	libusb_lock_events(ctx);
-	while (!completed) {
-		poll(libusbx file descriptors, 120*1000);
-		if (poll indicates activity)
-			libusb_handle_events_timeout(ctx, &zero_tv);
-	}
-	libusb_unlock_events(ctx);
-\endcode
- * ...and the answer is that it is not. This is because the transfer in the
- * code shown above may take a long time (say 30 seconds) to complete, and
- * the lock is not released until the transfer is completed.
- *
- * Another thread with similar code that wants to do event handling may be
- * working with a transfer that completes after a few milliseconds. Despite
- * having such a quick completion time, the other thread cannot check that
- * status of its transfer until the code above has finished (30 seconds later)
- * due to contention on the lock.
- *
- * To solve this, libusbx offers you a mechanism to determine when another
- * thread is handling events. It also offers a mechanism to block your thread
- * until the event handling thread has completed an event (and this mechanism
- * does not involve polling of file descriptors).
- *
- * After determining that another thread is currently handling events, you
- * obtain the <em>event waiters</em> lock using libusb_lock_event_waiters().
- * You then re-check that some other thread is still handling events, and if
- * so, you call libusb_wait_for_event().
- *
- * libusb_wait_for_event() puts your application to sleep until an event
- * occurs, or until a thread releases the events lock. When either of these
- * things happen, your thread is woken up, and should re-check the condition
- * it was waiting on. It should also re-check that another thread is handling
- * events, and if not, it should start handling events itself.
- *
- * This looks like the following, as pseudo-code:
-\code
-retry:
-if (libusb_try_lock_events(ctx) == 0) {
-	// we obtained the event lock: do our own event handling
-	while (!completed) {
-		if (!libusb_event_handling_ok(ctx)) {
-			libusb_unlock_events(ctx);
-			goto retry;
-		}
-		poll(libusbx file descriptors, 120*1000);
-		if (poll indicates activity)
-			libusb_handle_events_locked(ctx, 0);
-	}
-	libusb_unlock_events(ctx);
-} else {
-	// another thread is doing event handling. wait for it to signal us that
-	// an event has completed
-	libusb_lock_event_waiters(ctx);
-
-	while (!completed) {
-		// now that we have the event waiters lock, double check that another
-		// thread is still handling events for us. (it may have ceased handling
-		// events in the time it took us to reach this point)
-		if (!libusb_event_handler_active(ctx)) {
-			// whoever was handling events is no longer doing so, try again
-			libusb_unlock_event_waiters(ctx);
-			goto retry;
-		}
-
-		libusb_wait_for_event(ctx, NULL);
-	}
-	libusb_unlock_event_waiters(ctx);
-}
-printf("completed!\n");
-\endcode
- *
- * A naive look at the above code may suggest that this can only support
- * one event waiter (hence a total of 2 competing threads, the other doing
- * event handling), because the event waiter seems to have taken the event
- * waiters lock while waiting for an event. However, the system does support
- * multiple event waiters, because libusb_wait_for_event() actually drops
- * the lock while waiting, and reaquires it before continuing.
- *
- * We have now implemented code which can dynamically handle situations where
- * nobody is handling events (so we should do it ourselves), and it can also
- * handle situations where another thread is doing event handling (so we can
- * piggyback onto them). It is also equipped to handle a combination of
- * the two, for example, another thread is doing event handling, but for
- * whatever reason it stops doing so before our condition is met, so we take
- * over the event handling.
- *
- * Four functions were introduced in the above pseudo-code. Their importance
- * should be apparent from the code shown above.
- * -# libusb_try_lock_events() is a non-blocking function which attempts
- *    to acquire the events lock but returns a failure code if it is contended.
- * -# libusb_event_handling_ok() checks that libusbx is still happy for your
- *    thread to be performing event handling. Sometimes, libusbx needs to
- *    interrupt the event handler, and this is how you can check if you have
- *    been interrupted. If this function returns 0, the correct behaviour is
- *    for you to give up the event handling lock, and then to repeat the cycle.
- *    The following libusb_try_lock_events() will fail, so you will become an
- *    events waiter. For more information on this, read \ref fullstory below.
- * -# libusb_handle_events_locked() is a variant of
- *    libusb_handle_events_timeout() that you can call while holding the
- *    events lock. libusb_handle_events_timeout() itself implements similar
- *    logic to the above, so be sure not to call it when you are
- *    "working behind libusbx's back", as is the case here.
- * -# libusb_event_handler_active() determines if someone is currently
- *    holding the events lock
- *
- * You might be wondering why there is no function to wake up all threads
- * blocked on libusb_wait_for_event(). This is because libusbx can do this
- * internally: it will wake up all such threads when someone calls
- * libusb_unlock_events() or when a transfer completes (at the point after its
- * callback has returned).
- *
- * \subsection fullstory The full story
- *
- * The above explanation should be enough to get you going, but if you're
- * really thinking through the issues then you may be left with some more
- * questions regarding libusbx's internals. If you're curious, read on, and if
- * not, skip to the next section to avoid confusing yourself!
- *
- * The immediate question that may spring to mind is: what if one thread
- * modifies the set of file descriptors that need to be polled while another
- * thread is doing event handling?
- *
- * There are 2 situations in which this may happen.
- * -# libusb_open() will add another file descriptor to the poll set,
- *    therefore it is desirable to interrupt the event handler so that it
- *    restarts, picking up the new descriptor.
- * -# libusb_close() will remove a file descriptor from the poll set. There
- *    are all kinds of race conditions that could arise here, so it is
- *    important that nobody is doing event handling at this time.
- *
- * libusbx handles these issues internally, so application developers do not
- * have to stop their event handlers while opening/closing devices. Here's how
- * it works, focusing on the libusb_close() situation first:
- *
- * -# During initialization, libusbx opens an internal pipe, and it adds the read
- *    end of this pipe to the set of file descriptors to be polled.
- * -# During libusb_close(), libusbx writes some dummy data on this control pipe.
- *    This immediately interrupts the event handler. libusbx also records
- *    internally that it is trying to interrupt event handlers for this
- *    high-priority event.
- * -# At this point, some of the functions described above start behaving
- *    differently:
- *   - libusb_event_handling_ok() starts returning 1, indicating that it is NOT
- *     OK for event handling to continue.
- *   - libusb_try_lock_events() starts returning 1, indicating that another
- *     thread holds the event handling lock, even if the lock is uncontended.
- *   - libusb_event_handler_active() starts returning 1, indicating that
- *     another thread is doing event handling, even if that is not true.
- * -# The above changes in behaviour result in the event handler stopping and
- *    giving up the events lock very quickly, giving the high-priority
- *    libusb_close() operation a "free ride" to acquire the events lock. All
- *    threads that are competing to do event handling become event waiters.
- * -# With the events lock held inside libusb_close(), libusbx can safely remove
- *    a file descriptor from the poll set, in the safety of knowledge that
- *    nobody is polling those descriptors or trying to access the poll set.
- * -# After obtaining the events lock, the close operation completes very
- *    quickly (usually a matter of milliseconds) and then immediately releases
- *    the events lock.
- * -# At the same time, the behaviour of libusb_event_handling_ok() and friends
- *    reverts to the original, documented behaviour.
- * -# The release of the events lock causes the threads that are waiting for
- *    events to be woken up and to start competing to become event handlers
- *    again. One of them will succeed; it will then re-obtain the list of poll
- *    descriptors, and USB I/O will then continue as normal.
- *
- * libusb_open() is similar, and is actually a more simplistic case. Upon a
- * call to libusb_open():
- *
- * -# The device is opened and a file descriptor is added to the poll set.
- * -# libusbx sends some dummy data on the control pipe, and records that it
- *    is trying to modify the poll descriptor set.
- * -# The event handler is interrupted, and the same behaviour change as for
- *    libusb_close() takes effect, causing all event handling threads to become
- *    event waiters.
- * -# The libusb_open() implementation takes its free ride to the events lock.
- * -# Happy that it has successfully paused the events handler, libusb_open()
- *    releases the events lock.
- * -# The event waiter threads are all woken up and compete to become event
- *    handlers again. The one that succeeds will obtain the list of poll
- *    descriptors again, which will include the addition of the new device.
- *
- * \subsection concl Closing remarks
- *
- * The above may seem a little complicated, but hopefully I have made it clear
- * why such complications are necessary. Also, do not forget that this only
- * applies to applications that take libusbx's file descriptors and integrate
- * them into their own polling loops.
- *
- * You may decide that it is OK for your multi-threaded application to ignore
- * some of the rules and locks detailed above, because you don't think that
- * two threads can ever be polling the descriptors at the same time. If that
- * is the case, then that's good news for you because you don't have to worry.
- * But be careful here; remember that the synchronous I/O functions do event
- * handling internally. If you have one thread doing event handling in a loop
- * (without implementing the rules and locking semantics documented above)
- * and another trying to send a synchronous USB transfer, you will end up with
- * two threads monitoring the same descriptors, and the above-described
- * undesirable behaviour occuring. The solution is for your polling thread to
- * play by the rules; the synchronous I/O functions do so, and this will result
- * in them getting along in perfect harmony.
- *
- * If you do have a dedicated thread doing event handling, it is perfectly
- * legal for it to take the event handling lock for long periods of time. Any
- * synchronous I/O functions you call from other threads will transparently
- * fall back to the "event waiters" mechanism detailed above. The only
- * consideration that your event handling thread must apply is the one related
- * to libusb_event_handling_ok(): you must call this before every poll(), and
- * give up the events lock if instructed.
- */
-
-int usbi_io_init(struct libusb_context *ctx)
-{
-	int r;
-
-	usbi_mutex_init(&ctx->flying_transfers_lock, NULL);
-	usbi_mutex_init(&ctx->pollfds_lock, NULL);
-	usbi_mutex_init(&ctx->pollfd_modify_lock, NULL);
-	usbi_mutex_init_recursive(&ctx->events_lock, NULL);
-	usbi_mutex_init(&ctx->event_waiters_lock, NULL);
-	usbi_cond_init(&ctx->event_waiters_cond, NULL);
-	list_init(&ctx->flying_transfers);
-	list_init(&ctx->pollfds);
-
-	/* FIXME should use an eventfd on kernels that support it */
-	r = usbi_pipe(ctx->ctrl_pipe);
-	if (r < 0) {
-		r = LIBUSB_ERROR_OTHER;
-		goto err;
-	}
-
-	r = usbi_add_pollfd(ctx, ctx->ctrl_pipe[0], POLLIN);
-	if (r < 0)
-		goto err_close_pipe;
-
-	/* create hotplug pipe */
-	r = usbi_pipe(ctx->hotplug_pipe);
-	if (r < 0) {
-		r = LIBUSB_ERROR_OTHER;
-		goto err;
-	}
-
-	r = usbi_add_pollfd(ctx, ctx->hotplug_pipe[0], POLLIN);
-	if (r < 0)
-		goto err_close_hp_pipe;
-
-#ifdef USBI_TIMERFD_AVAILABLE
-	ctx->timerfd = timerfd_create(usbi_backend->get_timerfd_clockid(),
-		TFD_NONBLOCK);
-	if (ctx->timerfd >= 0) {
-		usbi_dbg("using timerfd for timeouts");
-		r = usbi_add_pollfd(ctx, ctx->timerfd, POLLIN);
-		if (r < 0) {
-			usbi_remove_pollfd(ctx, ctx->ctrl_pipe[0]);
-			close(ctx->timerfd);
-			goto err_close_hp_pipe;
-		}
-	} else {
-		usbi_dbg("timerfd not available (code %d error %d)", ctx->timerfd, errno);
-		ctx->timerfd = -1;
-	}
-#endif
-
-	return 0;
-
-err_close_hp_pipe:
-	usbi_close(ctx->hotplug_pipe[0]);
-	usbi_close(ctx->hotplug_pipe[1]);
-err_close_pipe:
-	usbi_close(ctx->ctrl_pipe[0]);
-	usbi_close(ctx->ctrl_pipe[1]);
-err:
-	usbi_mutex_destroy(&ctx->flying_transfers_lock);
-	usbi_mutex_destroy(&ctx->pollfds_lock);
-	usbi_mutex_destroy(&ctx->pollfd_modify_lock);
-	usbi_mutex_destroy(&ctx->events_lock);
-	usbi_mutex_destroy(&ctx->event_waiters_lock);
-	usbi_cond_destroy(&ctx->event_waiters_cond);
-	return r;
-}
-
-void usbi_io_exit(struct libusb_context *ctx)
-{
-	usbi_remove_pollfd(ctx, ctx->ctrl_pipe[0]);
-	usbi_close(ctx->ctrl_pipe[0]);
-	usbi_close(ctx->ctrl_pipe[1]);
-	usbi_remove_pollfd(ctx, ctx->hotplug_pipe[0]);
-	usbi_close(ctx->hotplug_pipe[0]);
-	usbi_close(ctx->hotplug_pipe[1]);
-#ifdef USBI_TIMERFD_AVAILABLE
-	if (usbi_using_timerfd(ctx)) {
-		usbi_remove_pollfd(ctx, ctx->timerfd);
-		close(ctx->timerfd);
-	}
-#endif
-	usbi_mutex_destroy(&ctx->flying_transfers_lock);
-	usbi_mutex_destroy(&ctx->pollfds_lock);
-	usbi_mutex_destroy(&ctx->pollfd_modify_lock);
-	usbi_mutex_destroy(&ctx->events_lock);
-	usbi_mutex_destroy(&ctx->event_waiters_lock);
-	usbi_cond_destroy(&ctx->event_waiters_cond);
-}
-
-static int calculate_timeout(struct usbi_transfer *transfer)
-{
-	int r;
-	struct timespec current_time;
-	unsigned int timeout =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer)->timeout;
-
-	if (!timeout)
-		return 0;
-
-	r = usbi_backend->clock_gettime(USBI_CLOCK_MONOTONIC, &current_time);
-	if (r < 0) {
-		usbi_err(ITRANSFER_CTX(transfer),
-			"failed to read monotonic clock, errno=%d", errno);
-		return r;
-	}
-
-	current_time.tv_sec += timeout / 1000;
-	current_time.tv_nsec += (timeout % 1000) * 1000000;
-
-	while (current_time.tv_nsec >= 1000000000) {
-		current_time.tv_nsec -= 1000000000;
-		current_time.tv_sec++;
-	}
-
-	TIMESPEC_TO_TIMEVAL(&transfer->timeout, &current_time);
-	return 0;
-}
-
-/* add a transfer to the (timeout-sorted) active transfers list.
- * Callers of this function must hold the flying_transfers_lock.
- * This function *always* adds the transfer to the flying_transfers list,
- * it will return non 0 if it fails to update the timer, but even then the
- * transfer is added to the flying_transfers list. */
-static int add_to_flying_list(struct usbi_transfer *transfer)
-{
-	struct usbi_transfer *cur;
-	struct timeval *timeout = &transfer->timeout;
-	struct libusb_context *ctx = ITRANSFER_CTX(transfer);
-	int r = 0;
-	int first = 1;
-
-	/* if we have no other flying transfers, start the list with this one */
-	if (list_empty(&ctx->flying_transfers)) {
-		list_add(&transfer->list, &ctx->flying_transfers);
-		goto out;
-	}
-
-	/* if we have infinite timeout, append to end of list */
-	if (!timerisset(timeout)) {
-		list_add_tail(&transfer->list, &ctx->flying_transfers);
-		/* first is irrelevant in this case */
-		goto out;
-	}
-
-	/* otherwise, find appropriate place in list */
-	list_for_each_entry(cur, &ctx->flying_transfers, list, struct usbi_transfer) {
-		/* find first timeout that occurs after the transfer in question */
-		struct timeval *cur_tv = &cur->timeout;
-
-		if (!timerisset(cur_tv) || (cur_tv->tv_sec > timeout->tv_sec) ||
-				(cur_tv->tv_sec == timeout->tv_sec &&
-					cur_tv->tv_usec > timeout->tv_usec)) {
-			list_add_tail(&transfer->list, &cur->list);
-			goto out;
-		}
-		first = 0;
-	}
-	/* first is 0 at this stage (list not empty) */
-
-	/* otherwise we need to be inserted at the end */
-	list_add_tail(&transfer->list, &ctx->flying_transfers);
-out:
-#ifdef USBI_TIMERFD_AVAILABLE
-	if (first && usbi_using_timerfd(ctx) && timerisset(timeout)) {
-		/* if this transfer has the lowest timeout of all active transfers,
-		 * rearm the timerfd with this transfer's timeout */
-		const struct itimerspec it = { {0, 0},
-			{ timeout->tv_sec, timeout->tv_usec * 1000 } };
-		usbi_dbg("arm timerfd for timeout in %dms (first in line)",
-			USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer)->timeout);
-		r = timerfd_settime(ctx->timerfd, TFD_TIMER_ABSTIME, &it, NULL);
-		if (r < 0) {
-			usbi_warn(ctx, "failed to arm first timerfd (errno %d)", errno);
-			r = LIBUSB_ERROR_OTHER;
-		}
-	}
-#else
-	UNUSED(first);
-#endif
-
-	return r;
-}
-
-/** \ingroup asyncio
- * Allocate a libusbx transfer with a specified number of isochronous packet
- * descriptors. The returned transfer is pre-initialized for you. When the new
- * transfer is no longer needed, it should be freed with
- * libusb_free_transfer().
- *
- * Transfers intended for non-isochronous endpoints (e.g. control, bulk,
- * interrupt) should specify an iso_packets count of zero.
- *
- * For transfers intended for isochronous endpoints, specify an appropriate
- * number of packet descriptors to be allocated as part of the transfer.
- * The returned transfer is not specially initialized for isochronous I/O;
- * you are still required to set the
- * \ref libusb_transfer::num_iso_packets "num_iso_packets" and
- * \ref libusb_transfer::type "type" fields accordingly.
- *
- * It is safe to allocate a transfer with some isochronous packets and then
- * use it on a non-isochronous endpoint. If you do this, ensure that at time
- * of submission, num_iso_packets is 0 and that type is set appropriately.
- *
- * \param iso_packets number of isochronous packet descriptors to allocate
- * \returns a newly allocated transfer, or NULL on error
- */
-DEFAULT_VISIBILITY
-struct libusb_transfer * LIBUSB_CALL libusb_alloc_transfer(
-	int iso_packets)
-{
-	size_t os_alloc_size = usbi_backend->transfer_priv_size
-		+ (usbi_backend->add_iso_packet_size * iso_packets);
-	size_t alloc_size = sizeof(struct usbi_transfer)
-		+ sizeof(struct libusb_transfer)
-		+ (sizeof(struct libusb_iso_packet_descriptor) * iso_packets)
-		+ os_alloc_size;
-	struct usbi_transfer *itransfer = calloc(1, alloc_size);
-	if (!itransfer)
-		return NULL;
-
-	itransfer->num_iso_packets = iso_packets;
-	usbi_mutex_init(&itransfer->lock, NULL);
-	return USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-}
-
-/** \ingroup asyncio
- * Free a transfer structure. This should be called for all transfers
- * allocated with libusb_alloc_transfer().
- *
- * If the \ref libusb_transfer_flags::LIBUSB_TRANSFER_FREE_BUFFER
- * "LIBUSB_TRANSFER_FREE_BUFFER" flag is set and the transfer buffer is
- * non-NULL, this function will also free the transfer buffer using the
- * standard system memory allocator (e.g. free()).
- *
- * It is legal to call this function with a NULL transfer. In this case,
- * the function will simply return safely.
- *
- * It is not legal to free an active transfer (one which has been submitted
- * and has not yet completed).
- *
- * \param transfer the transfer to free
- */
-void API_EXPORTED libusb_free_transfer(struct libusb_transfer *transfer)
-{
-	struct usbi_transfer *itransfer;
-	if (!transfer)
-		return;
-
-	if (transfer->flags & LIBUSB_TRANSFER_FREE_BUFFER && transfer->buffer)
-		free(transfer->buffer);
-
-	itransfer = LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer);
-	usbi_mutex_destroy(&itransfer->lock);
-	free(itransfer);
-}
-
-#ifdef USBI_TIMERFD_AVAILABLE
-static int disarm_timerfd(struct libusb_context *ctx)
-{
-	const struct itimerspec disarm_timer = { { 0, 0 }, { 0, 0 } };
-	int r;
-
-	usbi_dbg("");
-	r = timerfd_settime(ctx->timerfd, 0, &disarm_timer, NULL);
-	if (r < 0)
-		return LIBUSB_ERROR_OTHER;
-	else
-		return 0;
-}
-
-/* iterates through the flying transfers, and rearms the timerfd based on the
- * next upcoming timeout.
- * must be called with flying_list locked.
- * returns 0 if there was no timeout to arm, 1 if the next timeout was armed,
- * or a LIBUSB_ERROR code on failure.
- */
-static int arm_timerfd_for_next_timeout(struct libusb_context *ctx)
-{
-	struct usbi_transfer *transfer;
-
-	list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
-		struct timeval *cur_tv = &transfer->timeout;
-
-		/* if we've reached transfers of infinite timeout, then we have no
-		 * arming to do */
-		if (!timerisset(cur_tv))
-			goto disarm;
-
-		/* act on first transfer that is not already cancelled */
-		if (!(transfer->flags & USBI_TRANSFER_TIMED_OUT)) {
-			int r;
-			const struct itimerspec it = { {0, 0},
-				{ cur_tv->tv_sec, cur_tv->tv_usec * 1000 } };
-			usbi_dbg("next timeout originally %dms", USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer)->timeout);
-			r = timerfd_settime(ctx->timerfd, TFD_TIMER_ABSTIME, &it, NULL);
-			if (r < 0)
-				return LIBUSB_ERROR_OTHER;
-			return 1;
-		}
-	}
-
-disarm:
-	return disarm_timerfd(ctx);
-}
-#else
-static int arm_timerfd_for_next_timeout(struct libusb_context *ctx)
-{
-	(void)ctx;
-	return 0;
-}
-#endif
-
-/** \ingroup asyncio
- * Submit a transfer. This function will fire off the USB transfer and then
- * return immediately.
- *
- * \param transfer the transfer to submit
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns LIBUSB_ERROR_BUSY if the transfer has already been submitted.
- * \returns LIBUSB_ERROR_NOT_SUPPORTED if the transfer flags are not supported
- * by the operating system.
- * \returns another LIBUSB_ERROR code on other failure
- */
-int API_EXPORTED libusb_submit_transfer(struct libusb_transfer *transfer)
-{
-	struct libusb_context *ctx = TRANSFER_CTX(transfer);
-	struct usbi_transfer *itransfer =
-		LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer);
-	int r;
-	int updated_fds;
-
-	usbi_mutex_lock(&itransfer->lock);
-	itransfer->transferred = 0;
-	itransfer->flags = 0;
-	r = calculate_timeout(itransfer);
-	if (r < 0) {
-		r = LIBUSB_ERROR_OTHER;
-		goto out;
-	}
-
-	usbi_mutex_lock(&ctx->flying_transfers_lock);
-	r = add_to_flying_list(itransfer);
-	if (r == LIBUSB_SUCCESS) {
-		r = usbi_backend->submit_transfer(itransfer);
-	}
-	if (r != LIBUSB_SUCCESS) {
-		list_del(&itransfer->list);
-		arm_timerfd_for_next_timeout(ctx);
-	}
-	usbi_mutex_unlock(&ctx->flying_transfers_lock);
-
-out:
-	updated_fds = (itransfer->flags & USBI_TRANSFER_UPDATED_FDS);
-	usbi_mutex_unlock(&itransfer->lock);
-	if (updated_fds)
-		usbi_fd_notification(ctx);
-	return r;
-}
-
-/** \ingroup asyncio
- * Asynchronously cancel a previously submitted transfer.
- * This function returns immediately, but this does not indicate cancellation
- * is complete. Your callback function will be invoked at some later time
- * with a transfer status of
- * \ref libusb_transfer_status::LIBUSB_TRANSFER_CANCELLED
- * "LIBUSB_TRANSFER_CANCELLED."
- *
- * \param transfer the transfer to cancel
- * \returns 0 on success
- * \returns LIBUSB_ERROR_NOT_FOUND if the transfer is already complete or
- * cancelled.
- * \returns a LIBUSB_ERROR code on failure
- */
-int API_EXPORTED libusb_cancel_transfer(struct libusb_transfer *transfer)
-{
-	struct usbi_transfer *itransfer =
-		LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer);
-	int r;
-
-	usbi_dbg("");
-	usbi_mutex_lock(&itransfer->lock);
-	r = usbi_backend->cancel_transfer(itransfer);
-	if (r < 0) {
-		if (r != LIBUSB_ERROR_NOT_FOUND &&
-		    r != LIBUSB_ERROR_NO_DEVICE)
-			usbi_err(TRANSFER_CTX(transfer),
-				"cancel transfer failed error %d", r);
-		else
-			usbi_dbg("cancel transfer failed error %d", r);
-
-		if (r == LIBUSB_ERROR_NO_DEVICE)
-			itransfer->flags |= USBI_TRANSFER_DEVICE_DISAPPEARED;
-	}
-
-	itransfer->flags |= USBI_TRANSFER_CANCELLING;
-
-	usbi_mutex_unlock(&itransfer->lock);
-	return r;
-}
-
-/* Handle completion of a transfer (completion might be an error condition).
- * This will invoke the user-supplied callback function, which may end up
- * freeing the transfer. Therefore you cannot use the transfer structure
- * after calling this function, and you should free all backend-specific
- * data before calling it.
- * Do not call this function with the usbi_transfer lock held. User-specified
- * callback functions may attempt to directly resubmit the transfer, which
- * will attempt to take the lock. */
-int usbi_handle_transfer_completion(struct usbi_transfer *itransfer,
-	enum libusb_transfer_status status)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = TRANSFER_CTX(transfer);
-	uint8_t flags;
-	int r = 0;
-
-	/* FIXME: could be more intelligent with the timerfd here. we don't need
-	 * to disarm the timerfd if there was no timer running, and we only need
-	 * to rearm the timerfd if the transfer that expired was the one with
-	 * the shortest timeout. */
-
-	usbi_mutex_lock(&ctx->flying_transfers_lock);
-	list_del(&itransfer->list);
-	if (usbi_using_timerfd(ctx))
-		r = arm_timerfd_for_next_timeout(ctx);
-	usbi_mutex_unlock(&ctx->flying_transfers_lock);
-	if (usbi_using_timerfd(ctx) && (r < 0))
-		return r;
-
-	if (status == LIBUSB_TRANSFER_COMPLETED
-			&& transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) {
-		int rqlen = transfer->length;
-		if (transfer->type == LIBUSB_TRANSFER_TYPE_CONTROL)
-			rqlen -= LIBUSB_CONTROL_SETUP_SIZE;
-		if (rqlen != itransfer->transferred) {
-			usbi_dbg("interpreting short transfer as error");
-			status = LIBUSB_TRANSFER_ERROR;
-		}
-	}
-
-	flags = transfer->flags;
-	transfer->status = status;
-	transfer->actual_length = itransfer->transferred;
-	usbi_dbg("transfer %p has callback %p", transfer, transfer->callback);
-	if (transfer->callback)
-		transfer->callback(transfer);
-	/* transfer might have been freed by the above call, do not use from
-	 * this point. */
-	if (flags & LIBUSB_TRANSFER_FREE_TRANSFER)
-		libusb_free_transfer(transfer);
-	usbi_mutex_lock(&ctx->event_waiters_lock);
-	usbi_cond_broadcast(&ctx->event_waiters_cond);
-	usbi_mutex_unlock(&ctx->event_waiters_lock);
-	return 0;
-}
-
-/* Similar to usbi_handle_transfer_completion() but exclusively for transfers
- * that were asynchronously cancelled. The same concerns w.r.t. freeing of
- * transfers exist here.
- * Do not call this function with the usbi_transfer lock held. User-specified
- * callback functions may attempt to directly resubmit the transfer, which
- * will attempt to take the lock. */
-int usbi_handle_transfer_cancellation(struct usbi_transfer *transfer)
-{
-	/* if the URB was cancelled due to timeout, report timeout to the user */
-	if (transfer->flags & USBI_TRANSFER_TIMED_OUT) {
-		usbi_dbg("detected timeout cancellation");
-		return usbi_handle_transfer_completion(transfer, LIBUSB_TRANSFER_TIMED_OUT);
-	}
-
-	/* otherwise its a normal async cancel */
-	return usbi_handle_transfer_completion(transfer, LIBUSB_TRANSFER_CANCELLED);
-}
-
-/** \ingroup poll
- * Attempt to acquire the event handling lock. This lock is used to ensure that
- * only one thread is monitoring libusbx event sources at any one time.
- *
- * You only need to use this lock if you are developing an application
- * which calls poll() or select() on libusbx's file descriptors directly.
- * If you stick to libusbx's event handling loop functions (e.g.
- * libusb_handle_events()) then you do not need to be concerned with this
- * locking.
- *
- * While holding this lock, you are trusted to actually be handling events.
- * If you are no longer handling events, you must call libusb_unlock_events()
- * as soon as possible.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \returns 0 if the lock was obtained successfully
- * \returns 1 if the lock was not obtained (i.e. another thread holds the lock)
- * \see \ref mtasync
- */
-int API_EXPORTED libusb_try_lock_events(libusb_context *ctx)
-{
-	int r;
-	unsigned int ru;
-	USBI_GET_CONTEXT(ctx);
-
-	/* is someone else waiting to modify poll fds? if so, don't let this thread
-	 * start event handling */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	ru = ctx->pollfd_modify;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-	if (ru) {
-		usbi_dbg("someone else is modifying poll fds");
-		return 1;
-	}
-
-	r = usbi_mutex_trylock(&ctx->events_lock);
-	if (r)
-		return 1;
-
-	ctx->event_handler_active = 1;
-	return 0;
-}
-
-/** \ingroup poll
- * Acquire the event handling lock, blocking until successful acquisition if
- * it is contended. This lock is used to ensure that only one thread is
- * monitoring libusbx event sources at any one time.
- *
- * You only need to use this lock if you are developing an application
- * which calls poll() or select() on libusbx's file descriptors directly.
- * If you stick to libusbx's event handling loop functions (e.g.
- * libusb_handle_events()) then you do not need to be concerned with this
- * locking.
- *
- * While holding this lock, you are trusted to actually be handling events.
- * If you are no longer handling events, you must call libusb_unlock_events()
- * as soon as possible.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \see \ref mtasync
- */
-void API_EXPORTED libusb_lock_events(libusb_context *ctx)
-{
-	USBI_GET_CONTEXT(ctx);
-	usbi_mutex_lock(&ctx->events_lock);
-	ctx->event_handler_active = 1;
-}
-
-/** \ingroup poll
- * Release the lock previously acquired with libusb_try_lock_events() or
- * libusb_lock_events(). Releasing this lock will wake up any threads blocked
- * on libusb_wait_for_event().
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \see \ref mtasync
- */
-void API_EXPORTED libusb_unlock_events(libusb_context *ctx)
-{
-	USBI_GET_CONTEXT(ctx);
-	ctx->event_handler_active = 0;
-	usbi_mutex_unlock(&ctx->events_lock);
-
-	/* FIXME: perhaps we should be a bit more efficient by not broadcasting
-	 * the availability of the events lock when we are modifying pollfds
-	 * (check ctx->pollfd_modify)? */
-	usbi_mutex_lock(&ctx->event_waiters_lock);
-	usbi_cond_broadcast(&ctx->event_waiters_cond);
-	usbi_mutex_unlock(&ctx->event_waiters_lock);
-}
-
-/** \ingroup poll
- * Determine if it is still OK for this thread to be doing event handling.
- *
- * Sometimes, libusbx needs to temporarily pause all event handlers, and this
- * is the function you should use before polling file descriptors to see if
- * this is the case.
- *
- * If this function instructs your thread to give up the events lock, you
- * should just continue the usual logic that is documented in \ref mtasync.
- * On the next iteration, your thread will fail to obtain the events lock,
- * and will hence become an event waiter.
- *
- * This function should be called while the events lock is held: you don't
- * need to worry about the results of this function if your thread is not
- * the current event handler.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \returns 1 if event handling can start or continue
- * \returns 0 if this thread must give up the events lock
- * \see \ref fullstory "Multi-threaded I/O: the full story"
- */
-int API_EXPORTED libusb_event_handling_ok(libusb_context *ctx)
-{
-	unsigned int r;
-	USBI_GET_CONTEXT(ctx);
-
-	/* is someone else waiting to modify poll fds? if so, don't let this thread
-	 * continue event handling */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	r = ctx->pollfd_modify;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-	if (r) {
-		usbi_dbg("someone else is modifying poll fds");
-		return 0;
-	}
-
-	return 1;
-}
-
-
-/** \ingroup poll
- * Determine if an active thread is handling events (i.e. if anyone is holding
- * the event handling lock).
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \returns 1 if a thread is handling events
- * \returns 0 if there are no threads currently handling events
- * \see \ref mtasync
- */
-int API_EXPORTED libusb_event_handler_active(libusb_context *ctx)
-{
-	unsigned int r;
-	USBI_GET_CONTEXT(ctx);
-
-	/* is someone else waiting to modify poll fds? if so, don't let this thread
-	 * start event handling -- indicate that event handling is happening */
-	usbi_mutex_lock(&ctx->pollfd_modify_lock);
-	r = ctx->pollfd_modify;
-	usbi_mutex_unlock(&ctx->pollfd_modify_lock);
-	if (r) {
-		usbi_dbg("someone else is modifying poll fds");
-		return 1;
-	}
-
-	return ctx->event_handler_active;
-}
-
-/** \ingroup poll
- * Acquire the event waiters lock. This lock is designed to be obtained under
- * the situation where you want to be aware when events are completed, but
- * some other thread is event handling so calling libusb_handle_events() is not
- * allowed.
- *
- * You then obtain this lock, re-check that another thread is still handling
- * events, then call libusb_wait_for_event().
- *
- * You only need to use this lock if you are developing an application
- * which calls poll() or select() on libusbx's file descriptors directly,
- * <b>and</b> may potentially be handling events from 2 threads simultaenously.
- * If you stick to libusbx's event handling loop functions (e.g.
- * libusb_handle_events()) then you do not need to be concerned with this
- * locking.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \see \ref mtasync
- */
-void API_EXPORTED libusb_lock_event_waiters(libusb_context *ctx)
-{
-	USBI_GET_CONTEXT(ctx);
-	usbi_mutex_lock(&ctx->event_waiters_lock);
-}
-
-/** \ingroup poll
- * Release the event waiters lock.
- * \param ctx the context to operate on, or NULL for the default context
- * \see \ref mtasync
- */
-void API_EXPORTED libusb_unlock_event_waiters(libusb_context *ctx)
-{
-	USBI_GET_CONTEXT(ctx);
-	usbi_mutex_unlock(&ctx->event_waiters_lock);
-}
-
-/** \ingroup poll
- * Wait for another thread to signal completion of an event. Must be called
- * with the event waiters lock held, see libusb_lock_event_waiters().
- *
- * This function will block until any of the following conditions are met:
- * -# The timeout expires
- * -# A transfer completes
- * -# A thread releases the event handling lock through libusb_unlock_events()
- *
- * Condition 1 is obvious. Condition 2 unblocks your thread <em>after</em>
- * the callback for the transfer has completed. Condition 3 is important
- * because it means that the thread that was previously handling events is no
- * longer doing so, so if any events are to complete, another thread needs to
- * step up and start event handling.
- *
- * This function releases the event waiters lock before putting your thread
- * to sleep, and reacquires the lock as it is being woken up.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param tv maximum timeout for this blocking function. A NULL value
- * indicates unlimited timeout.
- * \returns 0 after a transfer completes or another thread stops event handling
- * \returns 1 if the timeout expired
- * \see \ref mtasync
- */
-int API_EXPORTED libusb_wait_for_event(libusb_context *ctx, struct timeval *tv)
-{
-	struct timespec timeout;
-	int r;
-
-	USBI_GET_CONTEXT(ctx);
-	if (tv == NULL) {
-		usbi_cond_wait(&ctx->event_waiters_cond, &ctx->event_waiters_lock);
-		return 0;
-	}
-
-	r = usbi_backend->clock_gettime(USBI_CLOCK_REALTIME, &timeout);
-	if (r < 0) {
-		usbi_err(ctx, "failed to read realtime clock, error %d", errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	timeout.tv_sec += tv->tv_sec;
-	timeout.tv_nsec += tv->tv_usec * 1000;
-	while (timeout.tv_nsec >= 1000000000) {
-		timeout.tv_nsec -= 1000000000;
-		timeout.tv_sec++;
-	}
-
-	r = usbi_cond_timedwait(&ctx->event_waiters_cond,
-		&ctx->event_waiters_lock, &timeout);
-	return (r == ETIMEDOUT);
-}
-
-static void handle_timeout(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	int r;
-
-	itransfer->flags |= USBI_TRANSFER_TIMED_OUT;
-	r = libusb_cancel_transfer(transfer);
-	if (r < 0)
-		usbi_warn(TRANSFER_CTX(transfer),
-			"async cancel failed %d errno=%d", r, errno);
-}
-
-static int handle_timeouts_locked(struct libusb_context *ctx)
-{
-	int r;
-	struct timespec systime_ts;
-	struct timeval systime;
-	struct usbi_transfer *transfer;
-
-	if (list_empty(&ctx->flying_transfers))
-		return 0;
-
-	/* get current time */
-	r = usbi_backend->clock_gettime(USBI_CLOCK_MONOTONIC, &systime_ts);
-	if (r < 0)
-		return r;
-
-	TIMESPEC_TO_TIMEVAL(&systime, &systime_ts);
-
-	/* iterate through flying transfers list, finding all transfers that
-	 * have expired timeouts */
-	list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
-		struct timeval *cur_tv = &transfer->timeout;
-
-		/* if we've reached transfers of infinite timeout, we're all done */
-		if (!timerisset(cur_tv))
-			return 0;
-
-		/* ignore timeouts we've already handled */
-		if (transfer->flags & (USBI_TRANSFER_TIMED_OUT | USBI_TRANSFER_OS_HANDLES_TIMEOUT))
-			continue;
-
-		/* if transfer has non-expired timeout, nothing more to do */
-		if ((cur_tv->tv_sec > systime.tv_sec) ||
-				(cur_tv->tv_sec == systime.tv_sec &&
-					cur_tv->tv_usec > systime.tv_usec))
-			return 0;
-
-		/* otherwise, we've got an expired timeout to handle */
-		handle_timeout(transfer);
-	}
-	return 0;
-}
-
-static int handle_timeouts(struct libusb_context *ctx)
-{
-	int r;
-	USBI_GET_CONTEXT(ctx);
-	usbi_mutex_lock(&ctx->flying_transfers_lock);
-	r = handle_timeouts_locked(ctx);
-	usbi_mutex_unlock(&ctx->flying_transfers_lock);
-	return r;
-}
-
-#ifdef USBI_TIMERFD_AVAILABLE
-static int handle_timerfd_trigger(struct libusb_context *ctx)
-{
-	int r;
-
-	usbi_mutex_lock(&ctx->flying_transfers_lock);
-
-	/* process the timeout that just happened */
-	r = handle_timeouts_locked(ctx);
-	if (r < 0)
-		goto out;
-
-	/* arm for next timeout*/
-	r = arm_timerfd_for_next_timeout(ctx);
-
-out:
-	usbi_mutex_unlock(&ctx->flying_transfers_lock);
-	return r;
-}
-#endif
-
-/* do the actual event handling. assumes that no other thread is concurrently
- * doing the same thing. */
-static int handle_events(struct libusb_context *ctx, struct timeval *tv)
-{
-	int r;
-	struct usbi_pollfd *ipollfd;
-	POLL_NFDS_TYPE nfds = 0;
-	struct pollfd *fds = NULL;
-	int i = -1;
-	int timeout_ms;
-
-	usbi_mutex_lock(&ctx->pollfds_lock);
-	list_for_each_entry(ipollfd, &ctx->pollfds, list, struct usbi_pollfd)
-		nfds++;
-
-	/* TODO: malloc when number of fd's changes, not on every poll */
-	if (nfds != 0)
-		fds = malloc(sizeof(*fds) * nfds);
-	if (!fds) {
-		usbi_mutex_unlock(&ctx->pollfds_lock);
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	list_for_each_entry(ipollfd, &ctx->pollfds, list, struct usbi_pollfd) {
-		struct libusb_pollfd *pollfd = &ipollfd->pollfd;
-		int fd = pollfd->fd;
-		i++;
-		fds[i].fd = fd;
-		fds[i].events = pollfd->events;
-		fds[i].revents = 0;
-	}
-	usbi_mutex_unlock(&ctx->pollfds_lock);
-
-	timeout_ms = (int)(tv->tv_sec * 1000) + (tv->tv_usec / 1000);
-
-	/* round up to next millisecond */
-	if (tv->tv_usec % 1000)
-		timeout_ms++;
-
-	usbi_dbg("poll() %d fds with timeout in %dms", nfds, timeout_ms);
-	r = usbi_poll(fds, nfds, timeout_ms);
-	usbi_dbg("poll() returned %d", r);
-	if (r == 0) {
-		free(fds);
-		return handle_timeouts(ctx);
-	} else if (r == -1 && errno == EINTR) {
-		free(fds);
-		return LIBUSB_ERROR_INTERRUPTED;
-	} else if (r < 0) {
-		free(fds);
-		usbi_err(ctx, "poll failed %d err=%d\n", r, errno);
-		return LIBUSB_ERROR_IO;
-	}
-
-	/* fd[0] is always the ctrl pipe */
-	if (fds[0].revents) {
-		/* another thread wanted to interrupt event handling, and it succeeded!
-		 * handle any other events that cropped up at the same time, and
-		 * simply return */
-		usbi_dbg("caught a fish on the control pipe");
-
-		if (r == 1) {
-			r = 0;
-			goto handled;
-		} else {
-			/* prevent OS backend from trying to handle events on ctrl pipe */
-			fds[0].revents = 0;
-			r--;
-		}
-	}
-
-	/* fd[1] is always the hotplug pipe */
-	if (libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG) && fds[1].revents) {
-		libusb_hotplug_message message;
-		ssize_t ret;
-
-		usbi_dbg("caught a fish on the hotplug pipe");
-
-		/* read the message from the hotplug thread */
-		ret = usbi_read(ctx->hotplug_pipe[0], &message, sizeof (message));
-		if (ret < sizeof(message)) {
-			usbi_err(ctx, "hotplug pipe read error %d < %d",
-				 ret, sizeof(message));
-			r = LIBUSB_ERROR_OTHER;
-			goto handled;
-		}
-
-		usbi_hotplug_match(ctx, message.device, message.event);
-
-		/* the device left. dereference the device */
-		if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == message.event)
-			libusb_unref_device(message.device);
-
-		fds[1].revents = 0;
-		if (1 == r--)
-			goto handled;
-	} /* else there shouldn't be anything on this pipe */
-
-#ifdef USBI_TIMERFD_AVAILABLE
-	/* on timerfd configurations, fds[2] is the timerfd */
-	if (usbi_using_timerfd(ctx) && fds[2].revents) {
-		/* timerfd indicates that a timeout has expired */
-		int ret;
-		usbi_dbg("timerfd triggered");
-
-		ret = handle_timerfd_trigger(ctx);
-		if (ret < 0) {
-			/* return error code */
-			r = ret;
-			goto handled;
-		} else if (r == 1) {
-			/* no more active file descriptors, nothing more to do */
-			r = 0;
-			goto handled;
-		} else {
-			/* more events pending...
-			 * prevent OS backend from trying to handle events on timerfd */
-			fds[2].revents = 0;
-			r--;
-		}
-	}
-#endif
-
-	r = usbi_backend->handle_events(ctx, fds, nfds, r);
-	if (r)
-		usbi_err(ctx, "backend handle_events failed with error %d", r);
-
-handled:
-	free(fds);
-	return r;
-}
-
-/* returns the smallest of:
- *  1. timeout of next URB
- *  2. user-supplied timeout
- * returns 1 if there is an already-expired timeout, otherwise returns 0
- * and populates out
- */
-static int get_next_timeout(libusb_context *ctx, struct timeval *tv,
-	struct timeval *out)
-{
-	struct timeval timeout;
-	int r = libusb_get_next_timeout(ctx, &timeout);
-	if (r) {
-		/* timeout already expired? */
-		if (!timerisset(&timeout))
-			return 1;
-
-		/* choose the smallest of next URB timeout or user specified timeout */
-		if (timercmp(&timeout, tv, <))
-			*out = timeout;
-		else
-			*out = *tv;
-	} else {
-		*out = *tv;
-	}
-	return 0;
-}
-
-/** \ingroup poll
- * Handle any pending events.
- *
- * libusbx determines "pending events" by checking if any timeouts have expired
- * and by checking the set of file descriptors for activity.
- *
- * If a zero timeval is passed, this function will handle any already-pending
- * events and then immediately return in non-blocking style.
- *
- * If a non-zero timeval is passed and no events are currently pending, this
- * function will block waiting for events to handle up until the specified
- * timeout. If an event arrives or a signal is raised, this function will
- * return early.
- *
- * If the parameter completed is not NULL then <em>after obtaining the event
- * handling lock</em> this function will return immediately if the integer
- * pointed to is not 0. This allows for race free waiting for the completion
- * of a specific transfer.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param tv the maximum time to block waiting for events, or an all zero
- * timeval struct for non-blocking mode
- * \param completed pointer to completion integer to check, or NULL
- * \returns 0 on success, or a LIBUSB_ERROR code on failure
- * \see \ref mtasync
- */
-int API_EXPORTED libusb_handle_events_timeout_completed(libusb_context *ctx,
-	struct timeval *tv, int *completed)
-{
-	int r;
-	struct timeval poll_timeout;
-
-	USBI_GET_CONTEXT(ctx);
-	r = get_next_timeout(ctx, tv, &poll_timeout);
-	if (r) {
-		/* timeout already expired */
-		return handle_timeouts(ctx);
-	}
-
-retry:
-	if (libusb_try_lock_events(ctx) == 0) {
-		if (completed == NULL || !*completed) {
-			/* we obtained the event lock: do our own event handling */
-			usbi_dbg("doing our own event handling");
-			r = handle_events(ctx, &poll_timeout);
-		}
-		libusb_unlock_events(ctx);
-		return r;
-	}
-
-	/* another thread is doing event handling. wait for thread events that
-	 * notify event completion. */
-	libusb_lock_event_waiters(ctx);
-
-	if (completed && *completed)
-		goto already_done;
-
-	if (!libusb_event_handler_active(ctx)) {
-		/* we hit a race: whoever was event handling earlier finished in the
-		 * time it took us to reach this point. try the cycle again. */
-		libusb_unlock_event_waiters(ctx);
-		usbi_dbg("event handler was active but went away, retrying");
-		goto retry;
-	}
-
-	usbi_dbg("another thread is doing event handling");
-	r = libusb_wait_for_event(ctx, &poll_timeout);
-
-already_done:
-	libusb_unlock_event_waiters(ctx);
-
-	if (r < 0)
-		return r;
-	else if (r == 1)
-		return handle_timeouts(ctx);
-	else
-		return 0;
-}
-
-/** \ingroup poll
- * Handle any pending events
- *
- * Like libusb_handle_events_timeout_completed(), but without the completed
- * parameter, calling this function is equivalent to calling
- * libusb_handle_events_timeout_completed() with a NULL completed parameter.
- *
- * This function is kept primarily for backwards compatibility.
- * All new code should call libusb_handle_events_completed() or
- * libusb_handle_events_timeout_completed() to avoid race conditions.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param tv the maximum time to block waiting for events, or an all zero
- * timeval struct for non-blocking mode
- * \returns 0 on success, or a LIBUSB_ERROR code on failure
- */
-int API_EXPORTED libusb_handle_events_timeout(libusb_context *ctx,
-	struct timeval *tv)
-{
-	return libusb_handle_events_timeout_completed(ctx, tv, NULL);
-}
-
-/** \ingroup poll
- * Handle any pending events in blocking mode. There is currently a timeout
- * hardcoded at 60 seconds but we plan to make it unlimited in future. For
- * finer control over whether this function is blocking or non-blocking, or
- * for control over the timeout, use libusb_handle_events_timeout_completed()
- * instead.
- *
- * This function is kept primarily for backwards compatibility.
- * All new code should call libusb_handle_events_completed() or
- * libusb_handle_events_timeout_completed() to avoid race conditions.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \returns 0 on success, or a LIBUSB_ERROR code on failure
- */
-int API_EXPORTED libusb_handle_events(libusb_context *ctx)
-{
-	struct timeval tv;
-	tv.tv_sec = 60;
-	tv.tv_usec = 0;
-	return libusb_handle_events_timeout_completed(ctx, &tv, NULL);
-}
-
-/** \ingroup poll
- * Handle any pending events in blocking mode.
- *
- * Like libusb_handle_events(), with the addition of a completed parameter
- * to allow for race free waiting for the completion of a specific transfer.
- *
- * See libusb_handle_events_timeout_completed() for details on the completed
- * parameter.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param completed pointer to completion integer to check, or NULL
- * \returns 0 on success, or a LIBUSB_ERROR code on failure
- * \see \ref mtasync
- */
-int API_EXPORTED libusb_handle_events_completed(libusb_context *ctx,
-	int *completed)
-{
-	struct timeval tv;
-	tv.tv_sec = 60;
-	tv.tv_usec = 0;
-	return libusb_handle_events_timeout_completed(ctx, &tv, completed);
-}
-
-/** \ingroup poll
- * Handle any pending events by polling file descriptors, without checking if
- * any other threads are already doing so. Must be called with the event lock
- * held, see libusb_lock_events().
- *
- * This function is designed to be called under the situation where you have
- * taken the event lock and are calling poll()/select() directly on libusbx's
- * file descriptors (as opposed to using libusb_handle_events() or similar).
- * You detect events on libusbx's descriptors, so you then call this function
- * with a zero timeout value (while still holding the event lock).
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param tv the maximum time to block waiting for events, or zero for
- * non-blocking mode
- * \returns 0 on success, or a LIBUSB_ERROR code on failure
- * \see \ref mtasync
- */
-int API_EXPORTED libusb_handle_events_locked(libusb_context *ctx,
-	struct timeval *tv)
-{
-	int r;
-	struct timeval poll_timeout;
-
-	USBI_GET_CONTEXT(ctx);
-	r = get_next_timeout(ctx, tv, &poll_timeout);
-	if (r) {
-		/* timeout already expired */
-		return handle_timeouts(ctx);
-	}
-
-	return handle_events(ctx, &poll_timeout);
-}
-
-/** \ingroup poll
- * Determines whether your application must apply special timing considerations
- * when monitoring libusbx's file descriptors.
- *
- * This function is only useful for applications which retrieve and poll
- * libusbx's file descriptors in their own main loop (\ref pollmain).
- *
- * Ordinarily, libusbx's event handler needs to be called into at specific
- * moments in time (in addition to times when there is activity on the file
- * descriptor set). The usual approach is to use libusb_get_next_timeout()
- * to learn about when the next timeout occurs, and to adjust your
- * poll()/select() timeout accordingly so that you can make a call into the
- * library at that time.
- *
- * Some platforms supported by libusbx do not come with this baggage - any
- * events relevant to timing will be represented by activity on the file
- * descriptor set, and libusb_get_next_timeout() will always return 0.
- * This function allows you to detect whether you are running on such a
- * platform.
- *
- * Since v1.0.5.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \returns 0 if you must call into libusbx at times determined by
- * libusb_get_next_timeout(), or 1 if all timeout events are handled internally
- * or through regular activity on the file descriptors.
- * \see \ref pollmain "Polling libusbx file descriptors for event handling"
- */
-int API_EXPORTED libusb_pollfds_handle_timeouts(libusb_context *ctx)
-{
-#if defined(USBI_TIMERFD_AVAILABLE)
-	USBI_GET_CONTEXT(ctx);
-	return usbi_using_timerfd(ctx);
-#else
-	(void)ctx;
-	return 0;
-#endif
-}
-
-/** \ingroup poll
- * Determine the next internal timeout that libusbx needs to handle. You only
- * need to use this function if you are calling poll() or select() or similar
- * on libusbx's file descriptors yourself - you do not need to use it if you
- * are calling libusb_handle_events() or a variant directly.
- *
- * You should call this function in your main loop in order to determine how
- * long to wait for select() or poll() to return results. libusbx needs to be
- * called into at this timeout, so you should use it as an upper bound on
- * your select() or poll() call.
- *
- * When the timeout has expired, call into libusb_handle_events_timeout()
- * (perhaps in non-blocking mode) so that libusbx can handle the timeout.
- *
- * This function may return 1 (success) and an all-zero timeval. If this is
- * the case, it indicates that libusbx has a timeout that has already expired
- * so you should call libusb_handle_events_timeout() or similar immediately.
- * A return code of 0 indicates that there are no pending timeouts.
- *
- * On some platforms, this function will always returns 0 (no pending
- * timeouts). See \ref polltime.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param tv output location for a relative time against the current
- * clock in which libusbx must be called into in order to process timeout events
- * \returns 0 if there are no pending timeouts, 1 if a timeout was returned,
- * or LIBUSB_ERROR_OTHER on failure
- */
-int API_EXPORTED libusb_get_next_timeout(libusb_context *ctx,
-	struct timeval *tv)
-{
-	struct usbi_transfer *transfer;
-	struct timespec cur_ts;
-	struct timeval cur_tv;
-	struct timeval *next_timeout;
-	int r;
-	int found = 0;
-
-	USBI_GET_CONTEXT(ctx);
-	if (usbi_using_timerfd(ctx))
-		return 0;
-
-	usbi_mutex_lock(&ctx->flying_transfers_lock);
-	if (list_empty(&ctx->flying_transfers)) {
-		usbi_mutex_unlock(&ctx->flying_transfers_lock);
-		usbi_dbg("no URBs, no timeout!");
-		return 0;
-	}
-
-	/* find next transfer which hasn't already been processed as timed out */
-	list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
-		if (transfer->flags & (USBI_TRANSFER_TIMED_OUT | USBI_TRANSFER_OS_HANDLES_TIMEOUT))
-			continue;
-
-		/* no timeout for this transfer? */
-		if (!timerisset(&transfer->timeout))
-			continue;
-
-		found = 1;
-		break;
-	}
-	usbi_mutex_unlock(&ctx->flying_transfers_lock);
-
-	if (!found) {
-		usbi_dbg("no URB with timeout or all handled by OS; no timeout!");
-		return 0;
-	}
-
-	next_timeout = &transfer->timeout;
-
-	r = usbi_backend->clock_gettime(USBI_CLOCK_MONOTONIC, &cur_ts);
-	if (r < 0) {
-		usbi_err(ctx, "failed to read monotonic clock, errno=%d", errno);
-		return 0;
-	}
-	TIMESPEC_TO_TIMEVAL(&cur_tv, &cur_ts);
-
-	if (!timercmp(&cur_tv, next_timeout, <)) {
-		usbi_dbg("first timeout already expired");
-		timerclear(tv);
-	} else {
-		timersub(next_timeout, &cur_tv, tv);
-		usbi_dbg("next timeout in %d.%06ds", tv->tv_sec, tv->tv_usec);
-	}
-
-	return 1;
-}
-
-/** \ingroup poll
- * Register notification functions for file descriptor additions/removals.
- * These functions will be invoked for every new or removed file descriptor
- * that libusbx uses as an event source.
- *
- * To remove notifiers, pass NULL values for the function pointers.
- *
- * Note that file descriptors may have been added even before you register
- * these notifiers (e.g. at libusb_init() time).
- *
- * Additionally, note that the removal notifier may be called during
- * libusb_exit() (e.g. when it is closing file descriptors that were opened
- * and added to the poll set at libusb_init() time). If you don't want this,
- * remove the notifiers immediately before calling libusb_exit().
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \param added_cb pointer to function for addition notifications
- * \param removed_cb pointer to function for removal notifications
- * \param user_data User data to be passed back to callbacks (useful for
- * passing context information)
- */
-void API_EXPORTED libusb_set_pollfd_notifiers(libusb_context *ctx,
-	libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,
-	void *user_data)
-{
-	USBI_GET_CONTEXT(ctx);
-	ctx->fd_added_cb = added_cb;
-	ctx->fd_removed_cb = removed_cb;
-	ctx->fd_cb_user_data = user_data;
-}
-
-/* Add a file descriptor to the list of file descriptors to be monitored.
- * events should be specified as a bitmask of events passed to poll(), e.g.
- * POLLIN and/or POLLOUT. */
-int usbi_add_pollfd(struct libusb_context *ctx, int fd, short events)
-{
-	struct usbi_pollfd *ipollfd = malloc(sizeof(*ipollfd));
-	if (!ipollfd)
-		return LIBUSB_ERROR_NO_MEM;
-
-	usbi_dbg("add fd %d events %d", fd, events);
-	ipollfd->pollfd.fd = fd;
-	ipollfd->pollfd.events = events;
-	usbi_mutex_lock(&ctx->pollfds_lock);
-	list_add_tail(&ipollfd->list, &ctx->pollfds);
-	usbi_mutex_unlock(&ctx->pollfds_lock);
-
-	if (ctx->fd_added_cb)
-		ctx->fd_added_cb(fd, events, ctx->fd_cb_user_data);
-	return 0;
-}
-
-/* Remove a file descriptor from the list of file descriptors to be polled. */
-void usbi_remove_pollfd(struct libusb_context *ctx, int fd)
-{
-	struct usbi_pollfd *ipollfd;
-	int found = 0;
-
-	usbi_dbg("remove fd %d", fd);
-	usbi_mutex_lock(&ctx->pollfds_lock);
-	list_for_each_entry(ipollfd, &ctx->pollfds, list, struct usbi_pollfd)
-		if (ipollfd->pollfd.fd == fd) {
-			found = 1;
-			break;
-		}
-
-	if (!found) {
-		usbi_dbg("couldn't find fd %d to remove", fd);
-		usbi_mutex_unlock(&ctx->pollfds_lock);
-		return;
-	}
-
-	list_del(&ipollfd->list);
-	usbi_mutex_unlock(&ctx->pollfds_lock);
-	free(ipollfd);
-	if (ctx->fd_removed_cb)
-		ctx->fd_removed_cb(fd, ctx->fd_cb_user_data);
-}
-
-/** \ingroup poll
- * Retrieve a list of file descriptors that should be polled by your main loop
- * as libusbx event sources.
- *
- * The returned list is NULL-terminated and should be freed with free() when
- * done. The actual list contents must not be touched.
- *
- * As file descriptors are a Unix-specific concept, this function is not
- * available on Windows and will always return NULL.
- *
- * \param ctx the context to operate on, or NULL for the default context
- * \returns a NULL-terminated list of libusb_pollfd structures
- * \returns NULL on error
- * \returns NULL on platforms where the functionality is not available
- */
-DEFAULT_VISIBILITY
-const struct libusb_pollfd ** LIBUSB_CALL libusb_get_pollfds(
-	libusb_context *ctx)
-{
-#ifndef OS_WINDOWS
-	struct libusb_pollfd **ret = NULL;
-	struct usbi_pollfd *ipollfd;
-	size_t i = 0;
-	size_t cnt = 0;
-	USBI_GET_CONTEXT(ctx);
-
-	usbi_mutex_lock(&ctx->pollfds_lock);
-	list_for_each_entry(ipollfd, &ctx->pollfds, list, struct usbi_pollfd)
-		cnt++;
-
-	ret = calloc(cnt + 1, sizeof(struct libusb_pollfd *));
-	if (!ret)
-		goto out;
-
-	list_for_each_entry(ipollfd, &ctx->pollfds, list, struct usbi_pollfd)
-		ret[i++] = (struct libusb_pollfd *) ipollfd;
-	ret[cnt] = NULL;
-
-out:
-	usbi_mutex_unlock(&ctx->pollfds_lock);
-	return (const struct libusb_pollfd **) ret;
-#else
-	usbi_err(ctx, "external polling of libusbx's internal descriptors "\
-		"is not yet supported on Windows platforms");
-	return NULL;
-#endif
-}
-
-/* Backends may call this from handle_events to report disconnection of a
- * device. This function ensures transfers get cancelled appropriately.
- * Callers of this function must hold the events_lock.
- */
-void usbi_handle_disconnect(struct libusb_device_handle *handle)
-{
-	struct usbi_transfer *cur;
-	struct usbi_transfer *to_cancel;
-
-	usbi_dbg("device %d.%d",
-		handle->dev->bus_number, handle->dev->device_address);
-
-	/* terminate all pending transfers with the LIBUSB_TRANSFER_NO_DEVICE
-	 * status code.
-	 *
-	 * this is a bit tricky because:
-	 * 1. we can't do transfer completion while holding flying_transfers_lock
-	 *    because the completion handler may try to re-submit the transfer
-	 * 2. the transfers list can change underneath us - if we were to build a
-	 *    list of transfers to complete (while holding lock), the situation
-	 *    might be different by the time we come to free them
-	 *
-	 * so we resort to a loop-based approach as below
-	 *
-	 * This is safe because transfers are only removed from the
-	 * flying_transfer list by usbi_handle_transfer_completion and
-	 * libusb_close, both of which hold the events_lock while doing so,
-	 * so usbi_handle_disconnect cannot be running at the same time.
-	 *
-	 * Note that libusb_submit_transfer also removes the transfer from
-	 * the flying_transfer list on submission failure, but it keeps the
-	 * flying_transfer list locked between addition and removal, so
-	 * usbi_handle_disconnect never sees such transfers.
-	 */
-
-	while (1) {
-		usbi_mutex_lock(&HANDLE_CTX(handle)->flying_transfers_lock);
-		to_cancel = NULL;
-		list_for_each_entry(cur, &HANDLE_CTX(handle)->flying_transfers, list, struct usbi_transfer)
-			if (USBI_TRANSFER_TO_LIBUSB_TRANSFER(cur)->dev_handle == handle) {
-				to_cancel = cur;
-				break;
-			}
-		usbi_mutex_unlock(&HANDLE_CTX(handle)->flying_transfers_lock);
-
-		if (!to_cancel)
-			break;
-
-		usbi_dbg("cancelling transfer %p from disconnect",
-			 USBI_TRANSFER_TO_LIBUSB_TRANSFER(to_cancel));
-
-		usbi_backend->clear_transfer_priv(to_cancel);
-		usbi_handle_transfer_completion(to_cancel, LIBUSB_TRANSFER_NO_DEVICE);
-	}
-
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/libusb-1.0.def b/src/3rd_party-static/libusbx-1.0.16/libusb/libusb-1.0.def
deleted file mode 100644
index cb0e32ab93..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/libusb-1.0.def
+++ /dev/null
@@ -1,158 +0,0 @@
-LIBRARY "libusb-1.0.dll"
-EXPORTS
-  libusb_alloc_transfer
-  libusb_alloc_transfer@4 = libusb_alloc_transfer
-  libusb_attach_kernel_driver
-  libusb_attach_kernel_driver@8 = libusb_attach_kernel_driver
-  libusb_bulk_transfer
-  libusb_bulk_transfer@24 = libusb_bulk_transfer
-  libusb_cancel_transfer
-  libusb_cancel_transfer@4 = libusb_cancel_transfer
-  libusb_claim_interface
-  libusb_claim_interface@8 = libusb_claim_interface
-  libusb_clear_halt
-  libusb_clear_halt@8 = libusb_clear_halt
-  libusb_close
-  libusb_close@4 = libusb_close
-  libusb_control_transfer
-  libusb_control_transfer@32 = libusb_control_transfer
-  libusb_detach_kernel_driver
-  libusb_detach_kernel_driver@8 = libusb_detach_kernel_driver
-  libusb_error_name
-  libusb_error_name@4 = libusb_error_name
-  libusb_event_handler_active
-  libusb_event_handler_active@4 = libusb_event_handler_active
-  libusb_event_handling_ok
-  libusb_event_handling_ok@4 = libusb_event_handling_ok
-  libusb_exit
-  libusb_exit@4 = libusb_exit
-  libusb_free_bos_descriptor
-  libusb_free_bos_descriptor@4 = libusb_free_bos_descriptor
-  libusb_free_config_descriptor
-  libusb_free_config_descriptor@4 = libusb_free_config_descriptor
-  libusb_free_container_id_descriptor
-  libusb_free_container_id_descriptor@4 = libusb_free_container_id_descriptor
-  libusb_free_device_list
-  libusb_free_device_list@8 = libusb_free_device_list
-  libusb_free_ss_endpoint_companion_descriptor
-  libusb_free_ss_endpoint_companion_descriptor@4 = libusb_free_ss_endpoint_companion_descriptor
-  libusb_free_ss_usb_device_capability_descriptor
-  libusb_free_ss_usb_device_capability_descriptor@4 = libusb_free_ss_usb_device_capability_descriptor
-  libusb_free_transfer
-  libusb_free_transfer@4 = libusb_free_transfer
-  libusb_free_usb_2_0_extension_descriptor
-  libusb_free_usb_2_0_extension_descriptor@4 = libusb_free_usb_2_0_extension_descriptor
-  libusb_get_active_config_descriptor
-  libusb_get_active_config_descriptor@8 = libusb_get_active_config_descriptor
-  libusb_get_bos_descriptor
-  libusb_get_bos_descriptor@8 = libusb_get_bos_descriptor
-  libusb_get_bus_number
-  libusb_get_bus_number@4 = libusb_get_bus_number
-  libusb_get_config_descriptor
-  libusb_get_config_descriptor@12 = libusb_get_config_descriptor
-  libusb_get_config_descriptor_by_value
-  libusb_get_config_descriptor_by_value@12 = libusb_get_config_descriptor_by_value
-  libusb_get_configuration
-  libusb_get_configuration@8 = libusb_get_configuration
-  libusb_get_container_id_descriptor
-  libusb_get_container_id_descriptor@12 = libusb_get_container_id_descriptor
-  libusb_get_device
-  libusb_get_device@4 = libusb_get_device
-  libusb_get_device_address
-  libusb_get_device_address@4 = libusb_get_device_address
-  libusb_get_device_descriptor
-  libusb_get_device_descriptor@8 = libusb_get_device_descriptor
-  libusb_get_device_list
-  libusb_get_device_list@8 = libusb_get_device_list
-  libusb_get_device_speed
-  libusb_get_device_speed@4 = libusb_get_device_speed
-  libusb_get_max_iso_packet_size
-  libusb_get_max_iso_packet_size@8 = libusb_get_max_iso_packet_size
-  libusb_get_max_packet_size
-  libusb_get_max_packet_size@8 = libusb_get_max_packet_size
-  libusb_get_next_timeout
-  libusb_get_next_timeout@8 = libusb_get_next_timeout
-  libusb_get_parent
-  libusb_get_parent@4 = libusb_get_parent
-  libusb_get_pollfds
-  libusb_get_pollfds@4 = libusb_get_pollfds
-  libusb_get_port_number
-  libusb_get_port_number@4 = libusb_get_port_number
-  libusb_get_port_numbers
-  libusb_get_port_numbers@12 = libusb_get_port_numbers
-  libusb_get_port_path
-  libusb_get_port_path@16 = libusb_get_port_path
-  libusb_get_ss_endpoint_companion_descriptor
-  libusb_get_ss_endpoint_companion_descriptor@12 = libusb_get_ss_endpoint_companion_descriptor
-  libusb_get_ss_usb_device_capability_descriptor
-  libusb_get_ss_usb_device_capability_descriptor@12 = libusb_get_ss_usb_device_capability_descriptor
-  libusb_get_string_descriptor_ascii
-  libusb_get_string_descriptor_ascii@16 = libusb_get_string_descriptor_ascii
-  libusb_get_usb_2_0_extension_descriptor
-  libusb_get_usb_2_0_extension_descriptor@12 = libusb_get_usb_2_0_extension_descriptor
-  libusb_get_version
-  libusb_get_version@0 = libusb_get_version
-  libusb_handle_events
-  libusb_handle_events@4 = libusb_handle_events
-  libusb_handle_events_completed
-  libusb_handle_events_completed@8 = libusb_handle_events_completed
-  libusb_handle_events_locked
-  libusb_handle_events_locked@8 = libusb_handle_events_locked
-  libusb_handle_events_timeout
-  libusb_handle_events_timeout@8 = libusb_handle_events_timeout
-  libusb_handle_events_timeout_completed
-  libusb_handle_events_timeout_completed@12 = libusb_handle_events_timeout_completed
-  libusb_has_capability
-  libusb_has_capability@4 = libusb_has_capability
-  libusb_hotplug_deregister_callback
-  libusb_hotplug_deregister_callback@8 = libusb_hotplug_deregister_callback
-  libusb_hotplug_register_callback
-  libusb_hotplug_register_callback@36 = libusb_hotplug_register_callback
-  libusb_init
-  libusb_init@4 = libusb_init
-  libusb_interrupt_transfer
-  libusb_interrupt_transfer@24 = libusb_interrupt_transfer
-  libusb_kernel_driver_active
-  libusb_kernel_driver_active@8 = libusb_kernel_driver_active
-  libusb_lock_event_waiters
-  libusb_lock_event_waiters@4 = libusb_lock_event_waiters
-  libusb_lock_events
-  libusb_lock_events@4 = libusb_lock_events
-  libusb_open
-  libusb_open@8 = libusb_open
-  libusb_open_device_with_vid_pid
-  libusb_open_device_with_vid_pid@12 = libusb_open_device_with_vid_pid
-  libusb_pollfds_handle_timeouts
-  libusb_pollfds_handle_timeouts@4 = libusb_pollfds_handle_timeouts
-  libusb_ref_device
-  libusb_ref_device@4 = libusb_ref_device
-  libusb_release_interface
-  libusb_release_interface@8 = libusb_release_interface
-  libusb_reset_device
-  libusb_reset_device@4 = libusb_reset_device
-  libusb_set_auto_detach_kernel_driver
-  libusb_set_auto_detach_kernel_driver@8 = libusb_set_auto_detach_kernel_driver
-  libusb_set_configuration
-  libusb_set_configuration@8 = libusb_set_configuration
-  libusb_set_debug
-  libusb_set_debug@8 = libusb_set_debug
-  libusb_set_interface_alt_setting
-  libusb_set_interface_alt_setting@12 = libusb_set_interface_alt_setting
-  libusb_set_pollfd_notifiers
-  libusb_set_pollfd_notifiers@16 = libusb_set_pollfd_notifiers
-  libusb_setlocale
-  libusb_setlocale@4 = libusb_setlocale
-  libusb_strerror
-  libusb_strerror@4 = libusb_strerror
-  libusb_submit_transfer
-  libusb_submit_transfer@4 = libusb_submit_transfer
-  libusb_try_lock_events
-  libusb_try_lock_events@4 = libusb_try_lock_events
-  libusb_unlock_event_waiters
-  libusb_unlock_event_waiters@4 = libusb_unlock_event_waiters
-  libusb_unlock_events
-  libusb_unlock_events@4 = libusb_unlock_events
-  libusb_unref_device
-  libusb_unref_device@4 = libusb_unref_device
-  libusb_wait_for_event
-  libusb_wait_for_event@8 = libusb_wait_for_event
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/libusb-1.0.rc b/src/3rd_party-static/libusbx-1.0.16/libusb/libusb-1.0.rc
deleted file mode 100644
index ae49757cc1..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/libusb-1.0.rc
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * For Windows: input this file to the Resoure Compiler to produce a binary
- * .res file. This is then embedded in the resultant library (like any other
- * compilation object).
- * The information can then be queried using standard APIs and can also be
- * viewed with utilities such as Windows Explorer.
- */
-#ifndef _WIN32_WCE
-#include "winresrc.h"
-#endif
-
-#include "version.h"
-#ifndef LIBUSB_VERSIONSTRING
-#define LU_STR(s) #s
-#define LU_XSTR(s) LU_STR(s)
-#if LIBUSB_NANO > 0
-#define LIBUSB_VERSIONSTRING \
-	LU_XSTR(LIBUSB_MAJOR) "." LU_XSTR(LIBUSB_MINOR) "." \
-	LU_XSTR(LIBUSB_MICRO) "." LU_XSTR(LIBUSB_NANO) LIBUSB_RC "\0"
-#else
-#define LIBUSB_VERSIONSTRING \
-	LU_XSTR(LIBUSB_MAJOR) "." LU_XSTR(LIBUSB_MINOR) "." \
-	LU_XSTR(LIBUSB_MICRO) LIBUSB_RC "\0"
-#endif
-#endif
-
-VS_VERSION_INFO VERSIONINFO
- FILEVERSION LIBUSB_MAJOR,LIBUSB_MINOR,LIBUSB_MICRO,LIBUSB_NANO
- PRODUCTVERSION LIBUSB_MAJOR,LIBUSB_MINOR,LIBUSB_MICRO,LIBUSB_NANO
- FILEFLAGSMASK 0x3fL
-#ifdef _DEBUG
- FILEFLAGS 0x1L
-#else
- FILEFLAGS 0x0L
-#endif
- FILEOS 0x40004L
- FILETYPE 0x2L
- FILESUBTYPE 0x0L
-BEGIN
-	BLOCK "StringFileInfo"
-	BEGIN
-		BLOCK "040904b0"
-		BEGIN
-			VALUE "CompanyName", "libusbx.org\0"
-			VALUE "FileDescription", "C library for writing portable USB drivers in userspace\0"
-			VALUE "FileVersion", LIBUSB_VERSIONSTRING
-			VALUE "InternalName", "libusb\0"
-			VALUE "LegalCopyright", "See individual source files, GNU LGPL v2.1 or later.\0"
-			VALUE "LegalTrademarks", "http://www.gnu.org/licenses/lgpl-2.1.html\0"
-			VALUE "OriginalFilename", "libusb-1.0.dll\0"
-			VALUE "PrivateBuild", "\0"
-			VALUE "ProductName", "libusb-1.0\0"
-			VALUE "ProductVersion", LIBUSB_VERSIONSTRING
-			VALUE "SpecialBuild", "\0"
-		END
-	END
-	BLOCK "VarFileInfo"
-	BEGIN
-		VALUE "Translation", 0x409, 1200
-	END
-END
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/libusb.h b/src/3rd_party-static/libusbx-1.0.16/libusb/libusb.h
deleted file mode 100644
index e8e120162f..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/libusb.h
+++ /dev/null
@@ -1,1941 +0,0 @@
-/*
- * Public libusbx header file
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- * Copyright © 2007-2008 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2012 Pete Batard <pete@akeo.ie>
- * Copyright © 2012 Nathan Hjelm <hjelmn@cs.unm.edu>
- * For more information, please visit: http://libusbx.org
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef LIBUSB_H
-#define LIBUSB_H
-
-#ifdef _MSC_VER
-/* on MS environments, the inline keyword is available in C++ only */
-#if !defined(__cplusplus)
-#define inline __inline
-#endif
-/* ssize_t is also not available (copy/paste from MinGW) */
-#ifndef _SSIZE_T_DEFINED
-#define _SSIZE_T_DEFINED
-#undef ssize_t
-#ifdef _WIN64
-  typedef __int64 ssize_t;
-#else
-  typedef int ssize_t;
-#endif /* _WIN64 */
-#endif /* _SSIZE_T_DEFINED */
-#endif /* _MSC_VER */
-
-/* stdint.h is not available on older MSVC */
-#if defined(_MSC_VER) && (_MSC_VER < 1600) && (!defined(_STDINT)) && (!defined(_STDINT_H))
-typedef unsigned __int8   uint8_t;
-typedef unsigned __int16  uint16_t;
-typedef unsigned __int32  uint32_t;
-#else
-#include <stdint.h>
-#endif
-
-#if !defined(_WIN32_WCE)
-#include <sys/types.h>
-#endif
-
-#if defined(__linux) || defined(__APPLE__) || defined(__CYGWIN__)
-#include <sys/time.h>
-#endif
-
-#include <time.h>
-#include <limits.h>
-
-/* 'interface' might be defined as a macro on Windows, so we need to
- * undefine it so as not to break the current libusbx API, because
- * libusb_config_descriptor has an 'interface' member
- * As this can be problematic if you include windows.h after libusb.h
- * in your sources, we force windows.h to be included first. */
-#if defined(_WIN32) || defined(__CYGWIN__) || defined(_WIN32_WCE)
-#include <windows.h>
-#if defined(interface)
-#undef interface
-#endif
-#if !defined(__CYGWIN__)
-#include <winsock.h>
-#endif
-#endif
-
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
-#define LIBUSB_DEPRECATED_FOR(f) \
-  __attribute__((deprecated("Use " #f " instead")))
-#else
-#define LIBUSB_DEPRECATED_FOR(f)
-#endif /* __GNUC__ */
-
-/** \def LIBUSB_CALL
- * \ingroup misc
- * libusbx's Windows calling convention.
- *
- * Under Windows, the selection of available compilers and configurations
- * means that, unlike other platforms, there is not <em>one true calling
- * convention</em> (calling convention: the manner in which parameters are
- * passed to funcions in the generated assembly code).
- *
- * Matching the Windows API itself, libusbx uses the WINAPI convention (which
- * translates to the <tt>stdcall</tt> convention) and guarantees that the
- * library is compiled in this way. The public header file also includes
- * appropriate annotations so that your own software will use the right
- * convention, even if another convention is being used by default within
- * your codebase.
- *
- * The one consideration that you must apply in your software is to mark
- * all functions which you use as libusbx callbacks with this LIBUSB_CALL
- * annotation, so that they too get compiled for the correct calling
- * convention.
- *
- * On non-Windows operating systems, this macro is defined as nothing. This
- * means that you can apply it to your code without worrying about
- * cross-platform compatibility.
- */
-/* LIBUSB_CALL must be defined on both definition and declaration of libusbx
- * functions. You'd think that declaration would be enough, but cygwin will
- * complain about conflicting types unless both are marked this way.
- * The placement of this macro is important too; it must appear after the
- * return type, before the function name. See internal documentation for
- * API_EXPORTED.
- */
-#if defined(_WIN32) || defined(__CYGWIN__) || defined(_WIN32_WCE)
-#define LIBUSB_CALL WINAPI
-#else
-#define LIBUSB_CALL
-#endif
-
-/** \def LIBUSBX_API_VERSION
- * \ingroup misc
- * libusbx's API version.
- *
- * Since version 1.0.13, to help with feature detection, libusbx defines
- * a LIBUSBX_API_VERSION macro that gets increased every time there is a
- * significant change to the API, such as the introduction of a new call,
- * the definition of a new macro/enum member, or any other element that
- * libusbx applications may want to detect at compilation time.
- *
- * The macro is typically used in an application as follows:
- * \code
- * #if defined(LIBUSBX_API_VERSION) && (LIBUSBX_API_VERSION >= 0x01001234)
- * // Use one of the newer features from the libusbx API
- * #endif
- * \endcode
- *
- * Another feature of LIBUSBX_API_VERSION is that it can be used to detect
- * whether you are compiling against the libusb or the libusbx library.
- *
- * Internally, LIBUSBX_API_VERSION is defined as follows:
- * (libusbx major << 24) | (libusbx minor << 16) | (16 bit incremental)
- */
-#define LIBUSBX_API_VERSION 0x01000102
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/** \def libusb_cpu_to_le16
- * \ingroup misc
- * Convert a 16-bit value from host-endian to little-endian format. On
- * little endian systems, this function does nothing. On big endian systems,
- * the bytes are swapped.
- * \param x the host-endian value to convert
- * \returns the value in little-endian byte order
- */
-static inline uint16_t libusb_cpu_to_le16(const uint16_t x)
-{
-	union {
-		uint8_t  b8[2];
-		uint16_t b16;
-	} _tmp;
-	_tmp.b8[1] = (uint8_t) (x >> 8);
-	_tmp.b8[0] = (uint8_t) (x & 0xff);
-	return _tmp.b16;
-}
-
-/** \def libusb_le16_to_cpu
- * \ingroup misc
- * Convert a 16-bit value from little-endian to host-endian format. On
- * little endian systems, this function does nothing. On big endian systems,
- * the bytes are swapped.
- * \param x the little-endian value to convert
- * \returns the value in host-endian byte order
- */
-#define libusb_le16_to_cpu libusb_cpu_to_le16
-
-/* standard USB stuff */
-
-/** \ingroup desc
- * Device and/or Interface Class codes */
-enum libusb_class_code {
-	/** In the context of a \ref libusb_device_descriptor "device descriptor",
-	 * this bDeviceClass value indicates that each interface specifies its
-	 * own class information and all interfaces operate independently.
-	 */
-	LIBUSB_CLASS_PER_INTERFACE = 0,
-
-	/** Audio class */
-	LIBUSB_CLASS_AUDIO = 1,
-
-	/** Communications class */
-	LIBUSB_CLASS_COMM = 2,
-
-	/** Human Interface Device class */
-	LIBUSB_CLASS_HID = 3,
-
-	/** Physical */
-	LIBUSB_CLASS_PHYSICAL = 5,
-
-	/** Printer class */
-	LIBUSB_CLASS_PRINTER = 7,
-
-	/** Image class */
-	LIBUSB_CLASS_PTP = 6, /* legacy name from libusb-0.1 usb.h */
-	LIBUSB_CLASS_IMAGE = 6,
-
-	/** Mass storage class */
-	LIBUSB_CLASS_MASS_STORAGE = 8,
-
-	/** Hub class */
-	LIBUSB_CLASS_HUB = 9,
-
-	/** Data class */
-	LIBUSB_CLASS_DATA = 10,
-
-	/** Smart Card */
-	LIBUSB_CLASS_SMART_CARD = 0x0b,
-
-	/** Content Security */
-	LIBUSB_CLASS_CONTENT_SECURITY = 0x0d,
-
-	/** Video */
-	LIBUSB_CLASS_VIDEO = 0x0e,
-
-	/** Personal Healthcare */
-	LIBUSB_CLASS_PERSONAL_HEALTHCARE = 0x0f,
-
-	/** Diagnostic Device */
-	LIBUSB_CLASS_DIAGNOSTIC_DEVICE = 0xdc,
-
-	/** Wireless class */
-	LIBUSB_CLASS_WIRELESS = 0xe0,
-
-	/** Application class */
-	LIBUSB_CLASS_APPLICATION = 0xfe,
-
-	/** Class is vendor-specific */
-	LIBUSB_CLASS_VENDOR_SPEC = 0xff
-};
-
-/** \ingroup desc
- * Descriptor types as defined by the USB specification. */
-enum libusb_descriptor_type {
-	/** Device descriptor. See libusb_device_descriptor. */
-	LIBUSB_DT_DEVICE = 0x01,
-
-	/** Configuration descriptor. See libusb_config_descriptor. */
-	LIBUSB_DT_CONFIG = 0x02,
-
-	/** String descriptor */
-	LIBUSB_DT_STRING = 0x03,
-
-	/** Interface descriptor. See libusb_interface_descriptor. */
-	LIBUSB_DT_INTERFACE = 0x04,
-
-	/** Endpoint descriptor. See libusb_endpoint_descriptor. */
-	LIBUSB_DT_ENDPOINT = 0x05,
-
-	/** BOS descriptor */
-	LIBUSB_DT_BOS = 0x0f,
-
-	/** Device Capability descriptor */
-	LIBUSB_DT_DEVICE_CAPABILITY = 0x10,
-
-	/** HID descriptor */
-	LIBUSB_DT_HID = 0x21,
-
-	/** HID report descriptor */
-	LIBUSB_DT_REPORT = 0x22,
-
-	/** Physical descriptor */
-	LIBUSB_DT_PHYSICAL = 0x23,
-
-	/** Hub descriptor */
-	LIBUSB_DT_HUB = 0x29,
-
-	/** SuperSpeed Hub descriptor */
-	LIBUSB_DT_SUPERSPEED_HUB = 0x2a,
-
-	/** SuperSpeed Endpoint Companion descriptor */
-	LIBUSB_DT_SS_ENDPOINT_COMPANION = 0x30
-};
-
-/* Descriptor sizes per descriptor type */
-#define LIBUSB_DT_DEVICE_SIZE			18
-#define LIBUSB_DT_CONFIG_SIZE			9
-#define LIBUSB_DT_INTERFACE_SIZE		9
-#define LIBUSB_DT_ENDPOINT_SIZE			7
-#define LIBUSB_DT_ENDPOINT_AUDIO_SIZE		9	/* Audio extension */
-#define LIBUSB_DT_HUB_NONVAR_SIZE		7
-#define LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE	6
-#define LIBUSB_DT_BOS_SIZE			5
-#define LIBUSB_DT_DEVICE_CAPABILITY_SIZE	3
-
-/* BOS descriptor sizes */
-#define LIBUSB_BT_USB_2_0_EXTENSION_SIZE	7
-#define LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE	10
-#define LIBUSB_BT_CONTAINER_ID_SIZE		20
-
-/* We unwrap the BOS => define its max size */
-#define LIBUSB_DT_BOS_MAX_SIZE		((LIBUSB_DT_BOS_SIZE)     +\
-					(LIBUSB_BT_USB_2_0_EXTENSION_SIZE)       +\
-					(LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE) +\
-					(LIBUSB_BT_CONTAINER_ID_SIZE))
-
-#define LIBUSB_ENDPOINT_ADDRESS_MASK	0x0f    /* in bEndpointAddress */
-#define LIBUSB_ENDPOINT_DIR_MASK		0x80
-
-/** \ingroup desc
- * Endpoint direction. Values for bit 7 of the
- * \ref libusb_endpoint_descriptor::bEndpointAddress "endpoint address" scheme.
- */
-enum libusb_endpoint_direction {
-	/** In: device-to-host */
-	LIBUSB_ENDPOINT_IN = 0x80,
-
-	/** Out: host-to-device */
-	LIBUSB_ENDPOINT_OUT = 0x00
-};
-
-#define LIBUSB_TRANSFER_TYPE_MASK			0x03    /* in bmAttributes */
-
-/** \ingroup desc
- * Endpoint transfer type. Values for bits 0:1 of the
- * \ref libusb_endpoint_descriptor::bmAttributes "endpoint attributes" field.
- */
-enum libusb_transfer_type {
-	/** Control endpoint */
-	LIBUSB_TRANSFER_TYPE_CONTROL = 0,
-
-	/** Isochronous endpoint */
-	LIBUSB_TRANSFER_TYPE_ISOCHRONOUS = 1,
-
-	/** Bulk endpoint */
-	LIBUSB_TRANSFER_TYPE_BULK = 2,
-
-	/** Interrupt endpoint */
-	LIBUSB_TRANSFER_TYPE_INTERRUPT = 3
-};
-
-/** \ingroup misc
- * Standard requests, as defined in table 9-5 of the USB 3.0 specifications */
-enum libusb_standard_request {
-	/** Request status of the specific recipient */
-	LIBUSB_REQUEST_GET_STATUS = 0x00,
-
-	/** Clear or disable a specific feature */
-	LIBUSB_REQUEST_CLEAR_FEATURE = 0x01,
-
-	/* 0x02 is reserved */
-
-	/** Set or enable a specific feature */
-	LIBUSB_REQUEST_SET_FEATURE = 0x03,
-
-	/* 0x04 is reserved */
-
-	/** Set device address for all future accesses */
-	LIBUSB_REQUEST_SET_ADDRESS = 0x05,
-
-	/** Get the specified descriptor */
-	LIBUSB_REQUEST_GET_DESCRIPTOR = 0x06,
-
-	/** Used to update existing descriptors or add new descriptors */
-	LIBUSB_REQUEST_SET_DESCRIPTOR = 0x07,
-
-	/** Get the current device configuration value */
-	LIBUSB_REQUEST_GET_CONFIGURATION = 0x08,
-
-	/** Set device configuration */
-	LIBUSB_REQUEST_SET_CONFIGURATION = 0x09,
-
-	/** Return the selected alternate setting for the specified interface */
-	LIBUSB_REQUEST_GET_INTERFACE = 0x0A,
-
-	/** Select an alternate interface for the specified interface */
-	LIBUSB_REQUEST_SET_INTERFACE = 0x0B,
-
-	/** Set then report an endpoint's synchronization frame */
-	LIBUSB_REQUEST_SYNCH_FRAME = 0x0C,
-
-	/** Sets both the U1 and U2 Exit Latency */
-	LIBUSB_REQUEST_SET_SEL = 0x30,
-
-	/** Delay from the time a host transmits a packet to the time it is
-	  * received by the device. */
-	LIBUSB_SET_ISOCH_DELAY = 0x31,
-};
-
-/** \ingroup misc
- * Request type bits of the
- * \ref libusb_control_setup::bmRequestType "bmRequestType" field in control
- * transfers. */
-enum libusb_request_type {
-	/** Standard */
-	LIBUSB_REQUEST_TYPE_STANDARD = (0x00 << 5),
-
-	/** Class */
-	LIBUSB_REQUEST_TYPE_CLASS = (0x01 << 5),
-
-	/** Vendor */
-	LIBUSB_REQUEST_TYPE_VENDOR = (0x02 << 5),
-
-	/** Reserved */
-	LIBUSB_REQUEST_TYPE_RESERVED = (0x03 << 5)
-};
-
-/** \ingroup misc
- * Recipient bits of the
- * \ref libusb_control_setup::bmRequestType "bmRequestType" field in control
- * transfers. Values 4 through 31 are reserved. */
-enum libusb_request_recipient {
-	/** Device */
-	LIBUSB_RECIPIENT_DEVICE = 0x00,
-
-	/** Interface */
-	LIBUSB_RECIPIENT_INTERFACE = 0x01,
-
-	/** Endpoint */
-	LIBUSB_RECIPIENT_ENDPOINT = 0x02,
-
-	/** Other */
-	LIBUSB_RECIPIENT_OTHER = 0x03,
-};
-
-#define LIBUSB_ISO_SYNC_TYPE_MASK		0x0C
-
-/** \ingroup desc
- * Synchronization type for isochronous endpoints. Values for bits 2:3 of the
- * \ref libusb_endpoint_descriptor::bmAttributes "bmAttributes" field in
- * libusb_endpoint_descriptor.
- */
-enum libusb_iso_sync_type {
-	/** No synchronization */
-	LIBUSB_ISO_SYNC_TYPE_NONE = 0,
-
-	/** Asynchronous */
-	LIBUSB_ISO_SYNC_TYPE_ASYNC = 1,
-
-	/** Adaptive */
-	LIBUSB_ISO_SYNC_TYPE_ADAPTIVE = 2,
-
-	/** Synchronous */
-	LIBUSB_ISO_SYNC_TYPE_SYNC = 3
-};
-
-#define LIBUSB_ISO_USAGE_TYPE_MASK 0x30
-
-/** \ingroup desc
- * Usage type for isochronous endpoints. Values for bits 4:5 of the
- * \ref libusb_endpoint_descriptor::bmAttributes "bmAttributes" field in
- * libusb_endpoint_descriptor.
- */
-enum libusb_iso_usage_type {
-	/** Data endpoint */
-	LIBUSB_ISO_USAGE_TYPE_DATA = 0,
-
-	/** Feedback endpoint */
-	LIBUSB_ISO_USAGE_TYPE_FEEDBACK = 1,
-
-	/** Implicit feedback Data endpoint */
-	LIBUSB_ISO_USAGE_TYPE_IMPLICIT = 2,
-};
-
-/** \ingroup desc
- * A structure representing the standard USB device descriptor. This
- * descriptor is documented in section 9.6.1 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_device_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_DEVICE LIBUSB_DT_DEVICE in this
-	 * context. */
-	uint8_t  bDescriptorType;
-
-	/** USB specification release number in binary-coded decimal. A value of
-	 * 0x0200 indicates USB 2.0, 0x0110 indicates USB 1.1, etc. */
-	uint16_t bcdUSB;
-
-	/** USB-IF class code for the device. See \ref libusb_class_code. */
-	uint8_t  bDeviceClass;
-
-	/** USB-IF subclass code for the device, qualified by the bDeviceClass
-	 * value */
-	uint8_t  bDeviceSubClass;
-
-	/** USB-IF protocol code for the device, qualified by the bDeviceClass and
-	 * bDeviceSubClass values */
-	uint8_t  bDeviceProtocol;
-
-	/** Maximum packet size for endpoint 0 */
-	uint8_t  bMaxPacketSize0;
-
-	/** USB-IF vendor ID */
-	uint16_t idVendor;
-
-	/** USB-IF product ID */
-	uint16_t idProduct;
-
-	/** Device release number in binary-coded decimal */
-	uint16_t bcdDevice;
-
-	/** Index of string descriptor describing manufacturer */
-	uint8_t  iManufacturer;
-
-	/** Index of string descriptor describing product */
-	uint8_t  iProduct;
-
-	/** Index of string descriptor containing device serial number */
-	uint8_t  iSerialNumber;
-
-	/** Number of possible configurations */
-	uint8_t  bNumConfigurations;
-};
-
-/** \ingroup desc
- * A structure representing the standard USB endpoint descriptor. This
- * descriptor is documented in section 9.6.6 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_endpoint_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_ENDPOINT LIBUSB_DT_ENDPOINT in
-	 * this context. */
-	uint8_t  bDescriptorType;
-
-	/** The address of the endpoint described by this descriptor. Bits 0:3 are
-	 * the endpoint number. Bits 4:6 are reserved. Bit 7 indicates direction,
-	 * see \ref libusb_endpoint_direction.
-	 */
-	uint8_t  bEndpointAddress;
-
-	/** Attributes which apply to the endpoint when it is configured using
-	 * the bConfigurationValue. Bits 0:1 determine the transfer type and
-	 * correspond to \ref libusb_transfer_type. Bits 2:3 are only used for
-	 * isochronous endpoints and correspond to \ref libusb_iso_sync_type.
-	 * Bits 4:5 are also only used for isochronous endpoints and correspond to
-	 * \ref libusb_iso_usage_type. Bits 6:7 are reserved.
-	 */
-	uint8_t  bmAttributes;
-
-	/** Maximum packet size this endpoint is capable of sending/receiving. */
-	uint16_t wMaxPacketSize;
-
-	/** Interval for polling endpoint for data transfers. */
-	uint8_t  bInterval;
-
-	/** For audio devices only: the rate at which synchronization feedback
-	 * is provided. */
-	uint8_t  bRefresh;
-
-	/** For audio devices only: the address if the synch endpoint */
-	uint8_t  bSynchAddress;
-
-	/** Extra descriptors. If libusbx encounters unknown endpoint descriptors,
-	 * it will store them here, should you wish to parse them. */
-	const unsigned char *extra;
-
-	/** Length of the extra descriptors, in bytes. */
-	int extra_length;
-};
-
-/** \ingroup desc
- * A structure representing the standard USB interface descriptor. This
- * descriptor is documented in section 9.6.5 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_interface_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_INTERFACE LIBUSB_DT_INTERFACE
-	 * in this context. */
-	uint8_t  bDescriptorType;
-
-	/** Number of this interface */
-	uint8_t  bInterfaceNumber;
-
-	/** Value used to select this alternate setting for this interface */
-	uint8_t  bAlternateSetting;
-
-	/** Number of endpoints used by this interface (excluding the control
-	 * endpoint). */
-	uint8_t  bNumEndpoints;
-
-	/** USB-IF class code for this interface. See \ref libusb_class_code. */
-	uint8_t  bInterfaceClass;
-
-	/** USB-IF subclass code for this interface, qualified by the
-	 * bInterfaceClass value */
-	uint8_t  bInterfaceSubClass;
-
-	/** USB-IF protocol code for this interface, qualified by the
-	 * bInterfaceClass and bInterfaceSubClass values */
-	uint8_t  bInterfaceProtocol;
-
-	/** Index of string descriptor describing this interface */
-	uint8_t  iInterface;
-
-	/** Array of endpoint descriptors. This length of this array is determined
-	 * by the bNumEndpoints field. */
-	const struct libusb_endpoint_descriptor *endpoint;
-
-	/** Extra descriptors. If libusbx encounters unknown interface descriptors,
-	 * it will store them here, should you wish to parse them. */
-	const unsigned char *extra;
-
-	/** Length of the extra descriptors, in bytes. */
-	int extra_length;
-};
-
-/** \ingroup desc
- * A collection of alternate settings for a particular USB interface.
- */
-struct libusb_interface {
-	/** Array of interface descriptors. The length of this array is determined
-	 * by the num_altsetting field. */
-	const struct libusb_interface_descriptor *altsetting;
-
-	/** The number of alternate settings that belong to this interface */
-	int num_altsetting;
-};
-
-/** \ingroup desc
- * A structure representing the standard USB configuration descriptor. This
- * descriptor is documented in section 9.6.3 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_config_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_CONFIG LIBUSB_DT_CONFIG
-	 * in this context. */
-	uint8_t  bDescriptorType;
-
-	/** Total length of data returned for this configuration */
-	uint16_t wTotalLength;
-
-	/** Number of interfaces supported by this configuration */
-	uint8_t  bNumInterfaces;
-
-	/** Identifier value for this configuration */
-	uint8_t  bConfigurationValue;
-
-	/** Index of string descriptor describing this configuration */
-	uint8_t  iConfiguration;
-
-	/** Configuration characteristics */
-	uint8_t  bmAttributes;
-
-	/** Maximum power consumption of the USB device from this bus in this
-	 * configuration when the device is fully opreation. Expressed in units
-	 * of 2 mA. */
-	uint8_t  MaxPower;
-
-	/** Array of interfaces supported by this configuration. The length of
-	 * this array is determined by the bNumInterfaces field. */
-	const struct libusb_interface *interface;
-
-	/** Extra descriptors. If libusbx encounters unknown configuration
-	 * descriptors, it will store them here, should you wish to parse them. */
-	const unsigned char *extra;
-
-	/** Length of the extra descriptors, in bytes. */
-	int extra_length;
-};
-
-/** \ingroup desc
- * A structure representing the superspeed endpoint companion
- * descriptor. This descriptor is documented in section 9.6.7 of
- * the USB 3.0 specification. All multiple-byte fields are represented in
- * host-endian format.
- */
-struct libusb_ss_endpoint_companion_descriptor {
-
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_SS_ENDPOINT_COMPANION in
-	 * this context. */
-	uint8_t  bDescriptorType;
-
-
-	/** The maximum number of packets the endpoint can send or
-	 *  recieve as part of a burst. */
-	uint8_t  bMaxBurst;
-
-	/** In bulk EP:	bits 4:0 represents the	maximum	number of
-	 *  streams the	EP supports. In	isochronous EP:	bits 1:0
-	 *  represents the Mult	- a zero based value that determines
-	 *  the	maximum	number of packets within a service interval  */
-	uint8_t  bmAttributes;
-
-	/** The	total number of bytes this EP will transfer every
-	 *  service interval. valid only for periodic EPs. */
-	uint16_t wBytesPerInterval;
-};
-
-/** \ingroup desc
- * A generic representation of a BOS Device Capability descriptor. It is
- * advised to check bDevCapabilityType and call the matching
- * libusb_get_*_descriptor function to get a structure fully matching the type.
- */
-struct libusb_bos_dev_capability_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t bLength;
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_DEVICE_CAPABILITY
-	 * LIBUSB_DT_DEVICE_CAPABILITY in this context. */
-	uint8_t bDescriptorType;
-	/** Device Capability type */
-	uint8_t bDevCapabilityType;
-	/** Device Capability data (bLength - 3 bytes) */
-	uint8_t dev_capability_data
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-	[] /* valid C99 code */
-#else
-	[0] /* non-standard, but usually working code */
-#endif
-	;
-};
-
-/** \ingroup desc
- * A structure representing the Binary Device Object Store (BOS) descriptor.
- * This descriptor is documented in section 9.6.2 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_bos_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_BOS LIBUSB_DT_BOS
-	 * in this context. */
-	uint8_t  bDescriptorType;
-
-	/** Length of this descriptor and all of its sub descriptors */
-	uint16_t wTotalLength;
-
-	/** The number of separate device capability descriptors in
-	 * the BOS */
-	uint8_t  bNumDeviceCaps;
-
-	/** bNumDeviceCap Device Capability Descriptors */
-	struct libusb_bos_dev_capability_descriptor *dev_capability
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-	[] /* valid C99 code */
-#else
-	[0] /* non-standard, but usually working code */
-#endif
-	;
-};
-
-/** \ingroup desc
- * A structure representing the USB 2.0 Extension descriptor
- * This descriptor is documented in section 9.6.2.1 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_usb_2_0_extension_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_DEVICE_CAPABILITY
-	 * LIBUSB_DT_DEVICE_CAPABILITY in this context. */
-	uint8_t  bDescriptorType;
-
-	/** Capability type. Will have value
-	 * \ref libusb_capability_type::LIBUSB_BT_USB_2_0_EXTENSION
-	 * LIBUSB_BT_USB_2_0_EXTENSION in this context. */
-	uint8_t  bDevCapabilityType;
-
-	/** Bitmap encoding of supported device level features.
-	 * A value of one in a bit location indicates a feature is
-	 * supported; a value of zero indicates it is not supported.
-	 * See \ref libusb_usb_2_0_extension_attributes. */
-	uint32_t  bmAttributes;
-};
-
-/** \ingroup desc
- * A structure representing the SuperSpeed USB Device Capability descriptor
- * This descriptor is documented in section 9.6.2.2 of the USB 3.0 specification.
- * All multiple-byte fields are represented in host-endian format.
- */
-struct libusb_ss_usb_device_capability_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_DEVICE_CAPABILITY
-	 * LIBUSB_DT_DEVICE_CAPABILITY in this context. */
-	uint8_t  bDescriptorType;
-
-	/** Capability type. Will have value
-	 * \ref libusb_capability_type::LIBUSB_BT_SS_USB_DEVICE_CAPABILITY
-	 * LIBUSB_BT_SS_USB_DEVICE_CAPABILITY in this context. */
-	uint8_t  bDevCapabilityType;
-
-	/** Bitmap encoding of supported device level features.
-	 * A value of one in a bit location indicates a feature is
-	 * supported; a value of zero indicates it is not supported.
-	 * See \ref libusb_ss_usb_device_capability_attributes. */
-	uint8_t  bmAttributes;
-
-	/** Bitmap encoding of the speed supported by this device when
-	 * operating in SuperSpeed mode. See \ref libusb_supported_speed. */
-	uint16_t wSpeedSupported;
-
-	/** The lowest speed at which all the functionality supported
-	 * by the device is available to the user. For example if the
-	 * device supports all its functionality when connected at
-	 * full speed and above then it sets this value to 1. */
-	uint8_t  bFunctionalitySupport;
-
-	/** U1 Device Exit Latency. */
-	uint8_t  bU1DevExitLat;
-
-	/** U2 Device Exit Latency. */
-	uint16_t bU2DevExitLat;
-};
-
-/** \ingroup desc
- * A structure representing the Container ID descriptor.
- * This descriptor is documented in section 9.6.2.3 of the USB 3.0 specification.
- * All multiple-byte fields, except UUIDs, are represented in host-endian format.
- */
-struct libusb_container_id_descriptor {
-	/** Size of this descriptor (in bytes) */
-	uint8_t  bLength;
-
-	/** Descriptor type. Will have value
-	 * \ref libusb_descriptor_type::LIBUSB_DT_DEVICE_CAPABILITY
-	 * LIBUSB_DT_DEVICE_CAPABILITY in this context. */
-	uint8_t  bDescriptorType;
-
-	/** Capability type. Will have value
-	 * \ref libusb_capability_type::LIBUSB_BT_CONTAINER_ID
-	 * LIBUSB_BT_CONTAINER_ID in this context. */
-	uint8_t  bDevCapabilityType;
-
-	/** Reserved field */
-	uint8_t bReserved;
-
-	/** 128 bit UUID */
-	uint8_t  ContainerID[16];
-};
-
-/** \ingroup asyncio
- * Setup packet for control transfers. */
-struct libusb_control_setup {
-	/** Request type. Bits 0:4 determine recipient, see
-	 * \ref libusb_request_recipient. Bits 5:6 determine type, see
-	 * \ref libusb_request_type. Bit 7 determines data transfer direction, see
-	 * \ref libusb_endpoint_direction.
-	 */
-	uint8_t  bmRequestType;
-
-	/** Request. If the type bits of bmRequestType are equal to
-	 * \ref libusb_request_type::LIBUSB_REQUEST_TYPE_STANDARD
-	 * "LIBUSB_REQUEST_TYPE_STANDARD" then this field refers to
-	 * \ref libusb_standard_request. For other cases, use of this field is
-	 * application-specific. */
-	uint8_t  bRequest;
-
-	/** Value. Varies according to request */
-	uint16_t wValue;
-
-	/** Index. Varies according to request, typically used to pass an index
-	 * or offset */
-	uint16_t wIndex;
-
-	/** Number of bytes to transfer */
-	uint16_t wLength;
-};
-
-#define LIBUSB_CONTROL_SETUP_SIZE (sizeof(struct libusb_control_setup))
-
-/* libusbx */
-
-struct libusb_context;
-struct libusb_device;
-struct libusb_device_handle;
-struct libusb_hotplug_callback;
-
-/** \ingroup lib
- * Structure providing the version of the libusbx runtime
- */
-struct libusb_version {
-	/** Library major version. */
-	const uint16_t major;
-
-	/** Library minor version. */
-	const uint16_t minor;
-
-	/** Library micro version. */
-	const uint16_t micro;
-
-	/** Library nano version. */
-	const uint16_t nano;
-
-	/** Library release candidate suffix string, e.g. "-rc4". */
-	const char *rc;
-
-	/** For ABI compatibility only. */
-	const char* describe;
-};
-
-/** \ingroup lib
- * Structure representing a libusbx session. The concept of individual libusbx
- * sessions allows for your program to use two libraries (or dynamically
- * load two modules) which both independently use libusb. This will prevent
- * interference between the individual libusbx users - for example
- * libusb_set_debug() will not affect the other user of the library, and
- * libusb_exit() will not destroy resources that the other user is still
- * using.
- *
- * Sessions are created by libusb_init() and destroyed through libusb_exit().
- * If your application is guaranteed to only ever include a single libusbx
- * user (i.e. you), you do not have to worry about contexts: pass NULL in
- * every function call where a context is required. The default context
- * will be used.
- *
- * For more information, see \ref contexts.
- */
-typedef struct libusb_context libusb_context;
-
-/** \ingroup dev
- * Structure representing a USB device detected on the system. This is an
- * opaque type for which you are only ever provided with a pointer, usually
- * originating from libusb_get_device_list().
- *
- * Certain operations can be performed on a device, but in order to do any
- * I/O you will have to first obtain a device handle using libusb_open().
- *
- * Devices are reference counted with libusb_ref_device() and
- * libusb_unref_device(), and are freed when the reference count reaches 0.
- * New devices presented by libusb_get_device_list() have a reference count of
- * 1, and libusb_free_device_list() can optionally decrease the reference count
- * on all devices in the list. libusb_open() adds another reference which is
- * later destroyed by libusb_close().
- */
-typedef struct libusb_device libusb_device;
-
-
-/** \ingroup dev
- * Structure representing a handle on a USB device. This is an opaque type for
- * which you are only ever provided with a pointer, usually originating from
- * libusb_open().
- *
- * A device handle is used to perform I/O and other operations. When finished
- * with a device handle, you should call libusb_close().
- */
-typedef struct libusb_device_handle libusb_device_handle;
-
-/** \ingroup dev
- * Speed codes. Indicates the speed at which the device is operating.
- */
-enum libusb_speed {
-	/** The OS doesn't report or know the device speed. */
-	LIBUSB_SPEED_UNKNOWN = 0,
-
-	/** The device is operating at low speed (1.5MBit/s). */
-	LIBUSB_SPEED_LOW = 1,
-
-	/** The device is operating at full speed (12MBit/s). */
-	LIBUSB_SPEED_FULL = 2,
-
-	/** The device is operating at high speed (480MBit/s). */
-	LIBUSB_SPEED_HIGH = 3,
-
-	/** The device is operating at super speed (5000MBit/s). */
-	LIBUSB_SPEED_SUPER = 4,
-};
-
-/** \ingroup dev
- * Supported speeds (wSpeedSupported) bitfield. Indicates what
- * speeds the device supports.
- */
-enum libusb_supported_speed {
-	/** Low speed operation supported (1.5MBit/s). */
-	LIBUSB_LOW_SPEED_OPERATION   = 1,
-
-	/** Full speed operation supported (12MBit/s). */
-	LIBUSB_FULL_SPEED_OPERATION  = 2,
-
-	/** High speed operation supported (480MBit/s). */
-	LIBUSB_HIGH_SPEED_OPERATION  = 4,
-
-	/** Superspeed operation supported (5000MBit/s). */
-	LIBUSB_SUPER_SPEED_OPERATION = 8,
-};
-
-/** \ingroup dev
- * Masks for the bits of the
- * \ref libusb_usb_2_0_extension_descriptor::bmAttributes "bmAttributes" field
- * of the USB 2.0 Extension descriptor.
- */
-enum libusb_usb_2_0_extension_attributes {
-	/** Supports Link Power Management (LPM) */
-	LIBUSB_BM_LPM_SUPPORT = 2,
-};
-
-/** \ingroup dev
- * Masks for the bits of the
- * \ref libusb_ss_usb_device_capability_descriptor::bmAttributes "bmAttributes" field
- * field of the SuperSpeed USB Device Capability descriptor.
- */
-enum libusb_ss_usb_device_capability_attributes {
-	/** Supports Latency Tolerance Messages (LTM) */
-	LIBUSB_BM_LTM_SUPPORT = 2,
-};
-
-/** \ingroup dev
- * USB capability types
- */
-enum libusb_bos_type {
-	/** Wireless USB device capability */
-	LIBUSB_BT_WIRELESS_USB_DEVICE_CAPABILITY	= 1,
-
-	/** USB 2.0 extensions */
-	LIBUSB_BT_USB_2_0_EXTENSION			= 2,
-
-	/** SuperSpeed USB device capability */
-	LIBUSB_BT_SS_USB_DEVICE_CAPABILITY		= 3,
-
-	/** Container ID type */
-	LIBUSB_BT_CONTAINER_ID				= 4,
-};
-
-/** \ingroup misc
- * Error codes. Most libusbx functions return 0 on success or one of these
- * codes on failure.
- * You can call libusb_error_name() to retrieve a string representation of an
- * error code or libusb_strerror() to get an end-user suitable description of
- * an error code.
- */
-enum libusb_error {
-	/** Success (no error) */
-	LIBUSB_SUCCESS = 0,
-
-	/** Input/output error */
-	LIBUSB_ERROR_IO = -1,
-
-	/** Invalid parameter */
-	LIBUSB_ERROR_INVALID_PARAM = -2,
-
-	/** Access denied (insufficient permissions) */
-	LIBUSB_ERROR_ACCESS = -3,
-
-	/** No such device (it may have been disconnected) */
-	LIBUSB_ERROR_NO_DEVICE = -4,
-
-	/** Entity not found */
-	LIBUSB_ERROR_NOT_FOUND = -5,
-
-	/** Resource busy */
-	LIBUSB_ERROR_BUSY = -6,
-
-	/** Operation timed out */
-	LIBUSB_ERROR_TIMEOUT = -7,
-
-	/** Overflow */
-	LIBUSB_ERROR_OVERFLOW = -8,
-
-	/** Pipe error */
-	LIBUSB_ERROR_PIPE = -9,
-
-	/** System call interrupted (perhaps due to signal) */
-	LIBUSB_ERROR_INTERRUPTED = -10,
-
-	/** Insufficient memory */
-	LIBUSB_ERROR_NO_MEM = -11,
-
-	/** Operation not supported or unimplemented on this platform */
-	LIBUSB_ERROR_NOT_SUPPORTED = -12,
-
-	/* NB: Remember to update LIBUSB_ERROR_COUNT below as well as the
-	   message strings in strerror.c when adding new error codes here. */
-
-	/** Other error */
-	LIBUSB_ERROR_OTHER = -99,
-};
-
-/* Total number of error codes in enum libusb_error */
-#define LIBUSB_ERROR_COUNT 14
-
-/** \ingroup asyncio
- * Transfer status codes */
-enum libusb_transfer_status {
-	/** Transfer completed without error. Note that this does not indicate
-	 * that the entire amount of requested data was transferred. */
-	LIBUSB_TRANSFER_COMPLETED,
-
-	/** Transfer failed */
-	LIBUSB_TRANSFER_ERROR,
-
-	/** Transfer timed out */
-	LIBUSB_TRANSFER_TIMED_OUT,
-
-	/** Transfer was cancelled */
-	LIBUSB_TRANSFER_CANCELLED,
-
-	/** For bulk/interrupt endpoints: halt condition detected (endpoint
-	 * stalled). For control endpoints: control request not supported. */
-	LIBUSB_TRANSFER_STALL,
-
-	/** Device was disconnected */
-	LIBUSB_TRANSFER_NO_DEVICE,
-
-	/** Device sent more data than requested */
-	LIBUSB_TRANSFER_OVERFLOW,
-
-	/* NB! Remember to update libusb_error_name()
-	   when adding new status codes here. */
-};
-
-/** \ingroup asyncio
- * libusb_transfer.flags values */
-enum libusb_transfer_flags {
-	/** Report short frames as errors */
-	LIBUSB_TRANSFER_SHORT_NOT_OK = 1<<0,
-
-	/** Automatically free() transfer buffer during libusb_free_transfer() */
-	LIBUSB_TRANSFER_FREE_BUFFER = 1<<1,
-
-	/** Automatically call libusb_free_transfer() after callback returns.
-	 * If this flag is set, it is illegal to call libusb_free_transfer()
-	 * from your transfer callback, as this will result in a double-free
-	 * when this flag is acted upon. */
-	LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2,
-
-	/** Terminate transfers that are a multiple of the endpoint's
-	 * wMaxPacketSize with an extra zero length packet. This is useful
-	 * when a device protocol mandates that each logical request is
-	 * terminated by an incomplete packet (i.e. the logical requests are
-	 * not separated by other means).
-	 *
-	 * This flag only affects host-to-device transfers to bulk and interrupt
-	 * endpoints. In other situations, it is ignored.
-	 *
-	 * This flag only affects transfers with a length that is a multiple of
-	 * the endpoint's wMaxPacketSize. On transfers of other lengths, this
-	 * flag has no effect. Therefore, if you are working with a device that
-	 * needs a ZLP whenever the end of the logical request falls on a packet
-	 * boundary, then it is sensible to set this flag on <em>every</em>
-	 * transfer (you do not have to worry about only setting it on transfers
-	 * that end on the boundary).
-	 *
-	 * This flag is currently only supported on Linux.
-	 * On other systems, libusb_submit_transfer() will return
-	 * LIBUSB_ERROR_NOT_SUPPORTED for every transfer where this flag is set.
-	 *
-	 * Available since libusb-1.0.9.
-	 */
-	LIBUSB_TRANSFER_ADD_ZERO_PACKET = 1 << 3,
-};
-
-/** \ingroup asyncio
- * Isochronous packet descriptor. */
-struct libusb_iso_packet_descriptor {
-	/** Length of data to request in this packet */
-	unsigned int length;
-
-	/** Amount of data that was actually transferred */
-	unsigned int actual_length;
-
-	/** Status code for this packet */
-	enum libusb_transfer_status status;
-};
-
-struct libusb_transfer;
-
-/** \ingroup asyncio
- * Asynchronous transfer callback function type. When submitting asynchronous
- * transfers, you pass a pointer to a callback function of this type via the
- * \ref libusb_transfer::callback "callback" member of the libusb_transfer
- * structure. libusbx will call this function later, when the transfer has
- * completed or failed. See \ref asyncio for more information.
- * \param transfer The libusb_transfer struct the callback function is being
- * notified about.
- */
-typedef void (LIBUSB_CALL *libusb_transfer_cb_fn)(struct libusb_transfer *transfer);
-
-/** \ingroup asyncio
- * The generic USB transfer structure. The user populates this structure and
- * then submits it in order to request a transfer. After the transfer has
- * completed, the library populates the transfer with the results and passes
- * it back to the user.
- */
-struct libusb_transfer {
-	/** Handle of the device that this transfer will be submitted to */
-	libusb_device_handle *dev_handle;
-
-	/** A bitwise OR combination of \ref libusb_transfer_flags. */
-	uint8_t flags;
-
-	/** Address of the endpoint where this transfer will be sent. */
-	unsigned char endpoint;
-
-	/** Type of the endpoint from \ref libusb_transfer_type */
-	unsigned char type;
-
-	/** Timeout for this transfer in millseconds. A value of 0 indicates no
-	 * timeout. */
-	unsigned int timeout;
-
-	/** The status of the transfer. Read-only, and only for use within
-	 * transfer callback function.
-	 *
-	 * If this is an isochronous transfer, this field may read COMPLETED even
-	 * if there were errors in the frames. Use the
-	 * \ref libusb_iso_packet_descriptor::status "status" field in each packet
-	 * to determine if errors occurred. */
-	enum libusb_transfer_status status;
-
-	/** Length of the data buffer */
-	int length;
-
-	/** Actual length of data that was transferred. Read-only, and only for
-	 * use within transfer callback function. Not valid for isochronous
-	 * endpoint transfers. */
-	int actual_length;
-
-	/** Callback function. This will be invoked when the transfer completes,
-	 * fails, or is cancelled. */
-	libusb_transfer_cb_fn callback;
-
-	/** User context data to pass to the callback function. */
-	void *user_data;
-
-	/** Data buffer */
-	unsigned char *buffer;
-
-	/** Number of isochronous packets. Only used for I/O with isochronous
-	 * endpoints. */
-	int num_iso_packets;
-
-	/** Isochronous packet descriptors, for isochronous transfers only. */
-	struct libusb_iso_packet_descriptor iso_packet_desc
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-	[] /* valid C99 code */
-#else
-	[0] /* non-standard, but usually working code */
-#endif
-	;
-};
-
-/** \ingroup misc
- * Capabilities supported by an instance of libusb on the current running
- * platform. Test if the loaded library supports a given capability by calling
- * \ref libusb_has_capability().
- */
-enum libusb_capability {
-	/** The libusb_has_capability() API is available. */
-	LIBUSB_CAP_HAS_CAPABILITY = 0x0000,
-	/** Hotplug support is available on this platform. */
-	LIBUSB_CAP_HAS_HOTPLUG = 0x0001,
-	/** The library can access HID devices without requiring user intervention.
-	 * Note that before being able to actually access an HID device, you may
-	 * still have to call additional libusbx functions such as
-	 * \ref libusb_detach_kernel_driver(). */
-	LIBUSB_CAP_HAS_HID_ACCESS = 0x0100,
-	/** The library supports detaching of the default USB driver, using 
-	 * \ref libusb_detach_kernel_driver(), if one is set by the OS kernel */
-	LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER = 0x0101
-};
-
-/** \ingroup lib
- *  Log message levels.
- *  - LIBUSB_LOG_LEVEL_NONE (0)    : no messages ever printed by the library (default)
- *  - LIBUSB_LOG_LEVEL_ERROR (1)   : error messages are printed to stderr
- *  - LIBUSB_LOG_LEVEL_WARNING (2) : warning and error messages are printed to stderr
- *  - LIBUSB_LOG_LEVEL_INFO (3)    : informational messages are printed to stdout, warning
- *    and error messages are printed to stderr
- *  - LIBUSB_LOG_LEVEL_DEBUG (4)   : debug and informational messages are printed to stdout,
- *    warnings and errors to stderr
- */
-enum libusb_log_level {
-	LIBUSB_LOG_LEVEL_NONE = 0,
-	LIBUSB_LOG_LEVEL_ERROR,
-	LIBUSB_LOG_LEVEL_WARNING,
-	LIBUSB_LOG_LEVEL_INFO,
-	LIBUSB_LOG_LEVEL_DEBUG,
-};
-
-int LIBUSB_CALL libusb_init(libusb_context **ctx);
-void LIBUSB_CALL libusb_exit(libusb_context *ctx);
-void LIBUSB_CALL libusb_set_debug(libusb_context *ctx, int level);
-const struct libusb_version * LIBUSB_CALL libusb_get_version(void);
-int LIBUSB_CALL libusb_has_capability(uint32_t capability);
-const char * LIBUSB_CALL libusb_error_name(int errcode);
-int LIBUSB_CALL libusb_setlocale(const char *locale);
-const char * LIBUSB_CALL libusb_strerror(enum libusb_error errcode);
-
-ssize_t LIBUSB_CALL libusb_get_device_list(libusb_context *ctx,
-	libusb_device ***list);
-void LIBUSB_CALL libusb_free_device_list(libusb_device **list,
-	int unref_devices);
-libusb_device * LIBUSB_CALL libusb_ref_device(libusb_device *dev);
-void LIBUSB_CALL libusb_unref_device(libusb_device *dev);
-
-int LIBUSB_CALL libusb_get_configuration(libusb_device_handle *dev,
-	int *config);
-int LIBUSB_CALL libusb_get_device_descriptor(libusb_device *dev,
-	struct libusb_device_descriptor *desc);
-int LIBUSB_CALL libusb_get_active_config_descriptor(libusb_device *dev,
-	struct libusb_config_descriptor **config);
-int LIBUSB_CALL libusb_get_config_descriptor(libusb_device *dev,
-	uint8_t config_index, struct libusb_config_descriptor **config);
-int LIBUSB_CALL libusb_get_config_descriptor_by_value(libusb_device *dev,
-	uint8_t bConfigurationValue, struct libusb_config_descriptor **config);
-void LIBUSB_CALL libusb_free_config_descriptor(
-	struct libusb_config_descriptor *config);
-int LIBUSB_CALL libusb_get_ss_endpoint_companion_descriptor(
-	struct libusb_context *ctx,
-	const struct libusb_endpoint_descriptor *endpoint,
-	struct libusb_ss_endpoint_companion_descriptor **ep_comp);
-void LIBUSB_CALL libusb_free_ss_endpoint_companion_descriptor(
-	struct libusb_ss_endpoint_companion_descriptor *ep_comp);
-int LIBUSB_CALL libusb_get_bos_descriptor(libusb_device_handle *handle,
-	struct libusb_bos_descriptor **bos);
-void LIBUSB_CALL libusb_free_bos_descriptor(struct libusb_bos_descriptor *bos);
-int LIBUSB_CALL libusb_get_usb_2_0_extension_descriptor(
-	struct libusb_context *ctx,
-	struct libusb_bos_dev_capability_descriptor *dev_cap,
-	struct libusb_usb_2_0_extension_descriptor **usb_2_0_extension);
-void LIBUSB_CALL libusb_free_usb_2_0_extension_descriptor(
-	struct libusb_usb_2_0_extension_descriptor *usb_2_0_extension);
-int LIBUSB_CALL libusb_get_ss_usb_device_capability_descriptor(
-	struct libusb_context *ctx,
-	struct libusb_bos_dev_capability_descriptor *dev_cap,
-	struct libusb_ss_usb_device_capability_descriptor **ss_usb_device_cap);
-void LIBUSB_CALL libusb_free_ss_usb_device_capability_descriptor(
-	struct libusb_ss_usb_device_capability_descriptor *ss_usb_device_cap);
-int LIBUSB_CALL libusb_get_container_id_descriptor(struct libusb_context *ctx,
-	struct libusb_bos_dev_capability_descriptor *dev_cap,
-	struct libusb_container_id_descriptor **container_id);
-void LIBUSB_CALL libusb_free_container_id_descriptor(
-	struct libusb_container_id_descriptor *container_id);
-uint8_t LIBUSB_CALL libusb_get_bus_number(libusb_device *dev);
-uint8_t LIBUSB_CALL libusb_get_port_number(libusb_device *dev);
-int LIBUSB_CALL libusb_get_port_numbers(libusb_device *dev, uint8_t* port_numbers, int port_numbers_len);
-LIBUSB_DEPRECATED_FOR(libusb_get_port_numbers)
-int LIBUSB_CALL libusb_get_port_path(libusb_context *ctx, libusb_device *dev, uint8_t* path, uint8_t path_length);
-libusb_device * LIBUSB_CALL libusb_get_parent(libusb_device *dev);
-uint8_t LIBUSB_CALL libusb_get_device_address(libusb_device *dev);
-int LIBUSB_CALL libusb_get_device_speed(libusb_device *dev);
-int LIBUSB_CALL libusb_get_max_packet_size(libusb_device *dev,
-	unsigned char endpoint);
-int LIBUSB_CALL libusb_get_max_iso_packet_size(libusb_device *dev,
-	unsigned char endpoint);
-
-int LIBUSB_CALL libusb_open(libusb_device *dev, libusb_device_handle **handle);
-void LIBUSB_CALL libusb_close(libusb_device_handle *dev_handle);
-libusb_device * LIBUSB_CALL libusb_get_device(libusb_device_handle *dev_handle);
-
-int LIBUSB_CALL libusb_set_configuration(libusb_device_handle *dev,
-	int configuration);
-int LIBUSB_CALL libusb_claim_interface(libusb_device_handle *dev,
-	int interface_number);
-int LIBUSB_CALL libusb_release_interface(libusb_device_handle *dev,
-	int interface_number);
-
-libusb_device_handle * LIBUSB_CALL libusb_open_device_with_vid_pid(
-	libusb_context *ctx, uint16_t vendor_id, uint16_t product_id);
-
-int LIBUSB_CALL libusb_set_interface_alt_setting(libusb_device_handle *dev,
-	int interface_number, int alternate_setting);
-int LIBUSB_CALL libusb_clear_halt(libusb_device_handle *dev,
-	unsigned char endpoint);
-int LIBUSB_CALL libusb_reset_device(libusb_device_handle *dev);
-
-int LIBUSB_CALL libusb_kernel_driver_active(libusb_device_handle *dev,
-	int interface_number);
-int LIBUSB_CALL libusb_detach_kernel_driver(libusb_device_handle *dev,
-	int interface_number);
-int LIBUSB_CALL libusb_attach_kernel_driver(libusb_device_handle *dev,
-	int interface_number);
-int LIBUSB_CALL libusb_set_auto_detach_kernel_driver(
-	libusb_device_handle *dev, int enable);
-
-/* async I/O */
-
-/** \ingroup asyncio
- * Get the data section of a control transfer. This convenience function is here
- * to remind you that the data does not start until 8 bytes into the actual
- * buffer, as the setup packet comes first.
- *
- * Calling this function only makes sense from a transfer callback function,
- * or situations where you have already allocated a suitably sized buffer at
- * transfer->buffer.
- *
- * \param transfer a transfer
- * \returns pointer to the first byte of the data section
- */
-static inline unsigned char *libusb_control_transfer_get_data(
-	struct libusb_transfer *transfer)
-{
-	return transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
-}
-
-/** \ingroup asyncio
- * Get the control setup packet of a control transfer. This convenience
- * function is here to remind you that the control setup occupies the first
- * 8 bytes of the transfer data buffer.
- *
- * Calling this function only makes sense from a transfer callback function,
- * or situations where you have already allocated a suitably sized buffer at
- * transfer->buffer.
- *
- * \param transfer a transfer
- * \returns a casted pointer to the start of the transfer data buffer
- */
-static inline struct libusb_control_setup *libusb_control_transfer_get_setup(
-	struct libusb_transfer *transfer)
-{
-	return (struct libusb_control_setup *) transfer->buffer;
-}
-
-/** \ingroup asyncio
- * Helper function to populate the setup packet (first 8 bytes of the data
- * buffer) for a control transfer. The wIndex, wValue and wLength values should
- * be given in host-endian byte order.
- *
- * \param buffer buffer to output the setup packet into
- * \param bmRequestType see the
- * \ref libusb_control_setup::bmRequestType "bmRequestType" field of
- * \ref libusb_control_setup
- * \param bRequest see the
- * \ref libusb_control_setup::bRequest "bRequest" field of
- * \ref libusb_control_setup
- * \param wValue see the
- * \ref libusb_control_setup::wValue "wValue" field of
- * \ref libusb_control_setup
- * \param wIndex see the
- * \ref libusb_control_setup::wIndex "wIndex" field of
- * \ref libusb_control_setup
- * \param wLength see the
- * \ref libusb_control_setup::wLength "wLength" field of
- * \ref libusb_control_setup
- */
-static inline void libusb_fill_control_setup(unsigned char *buffer,
-	uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
-	uint16_t wLength)
-{
-	struct libusb_control_setup *setup = (struct libusb_control_setup *) buffer;
-	setup->bmRequestType = bmRequestType;
-	setup->bRequest = bRequest;
-	setup->wValue = libusb_cpu_to_le16(wValue);
-	setup->wIndex = libusb_cpu_to_le16(wIndex);
-	setup->wLength = libusb_cpu_to_le16(wLength);
-}
-
-struct libusb_transfer * LIBUSB_CALL libusb_alloc_transfer(int iso_packets);
-int LIBUSB_CALL libusb_submit_transfer(struct libusb_transfer *transfer);
-int LIBUSB_CALL libusb_cancel_transfer(struct libusb_transfer *transfer);
-void LIBUSB_CALL libusb_free_transfer(struct libusb_transfer *transfer);
-
-/** \ingroup asyncio
- * Helper function to populate the required \ref libusb_transfer fields
- * for a control transfer.
- *
- * If you pass a transfer buffer to this function, the first 8 bytes will
- * be interpreted as a control setup packet, and the wLength field will be
- * used to automatically populate the \ref libusb_transfer::length "length"
- * field of the transfer. Therefore the recommended approach is:
- * -# Allocate a suitably sized data buffer (including space for control setup)
- * -# Call libusb_fill_control_setup()
- * -# If this is a host-to-device transfer with a data stage, put the data
- *    in place after the setup packet
- * -# Call this function
- * -# Call libusb_submit_transfer()
- *
- * It is also legal to pass a NULL buffer to this function, in which case this
- * function will not attempt to populate the length field. Remember that you
- * must then populate the buffer and length fields later.
- *
- * \param transfer the transfer to populate
- * \param dev_handle handle of the device that will handle the transfer
- * \param buffer data buffer. If provided, this function will interpret the
- * first 8 bytes as a setup packet and infer the transfer length from that.
- * \param callback callback function to be invoked on transfer completion
- * \param user_data user data to pass to callback function
- * \param timeout timeout for the transfer in milliseconds
- */
-static inline void libusb_fill_control_transfer(
-	struct libusb_transfer *transfer, libusb_device_handle *dev_handle,
-	unsigned char *buffer, libusb_transfer_cb_fn callback, void *user_data,
-	unsigned int timeout)
-{
-	struct libusb_control_setup *setup = (struct libusb_control_setup *) buffer;
-	transfer->dev_handle = dev_handle;
-	transfer->endpoint = 0;
-	transfer->type = LIBUSB_TRANSFER_TYPE_CONTROL;
-	transfer->timeout = timeout;
-	transfer->buffer = buffer;
-	if (setup)
-		transfer->length = (int) (LIBUSB_CONTROL_SETUP_SIZE
-			+ libusb_le16_to_cpu(setup->wLength));
-	transfer->user_data = user_data;
-	transfer->callback = callback;
-}
-
-/** \ingroup asyncio
- * Helper function to populate the required \ref libusb_transfer fields
- * for a bulk transfer.
- *
- * \param transfer the transfer to populate
- * \param dev_handle handle of the device that will handle the transfer
- * \param endpoint address of the endpoint where this transfer will be sent
- * \param buffer data buffer
- * \param length length of data buffer
- * \param callback callback function to be invoked on transfer completion
- * \param user_data user data to pass to callback function
- * \param timeout timeout for the transfer in milliseconds
- */
-static inline void libusb_fill_bulk_transfer(struct libusb_transfer *transfer,
-	libusb_device_handle *dev_handle, unsigned char endpoint,
-	unsigned char *buffer, int length, libusb_transfer_cb_fn callback,
-	void *user_data, unsigned int timeout)
-{
-	transfer->dev_handle = dev_handle;
-	transfer->endpoint = endpoint;
-	transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
-	transfer->timeout = timeout;
-	transfer->buffer = buffer;
-	transfer->length = length;
-	transfer->user_data = user_data;
-	transfer->callback = callback;
-}
-
-/** \ingroup asyncio
- * Helper function to populate the required \ref libusb_transfer fields
- * for an interrupt transfer.
- *
- * \param transfer the transfer to populate
- * \param dev_handle handle of the device that will handle the transfer
- * \param endpoint address of the endpoint where this transfer will be sent
- * \param buffer data buffer
- * \param length length of data buffer
- * \param callback callback function to be invoked on transfer completion
- * \param user_data user data to pass to callback function
- * \param timeout timeout for the transfer in milliseconds
- */
-static inline void libusb_fill_interrupt_transfer(
-	struct libusb_transfer *transfer, libusb_device_handle *dev_handle,
-	unsigned char endpoint, unsigned char *buffer, int length,
-	libusb_transfer_cb_fn callback, void *user_data, unsigned int timeout)
-{
-	transfer->dev_handle = dev_handle;
-	transfer->endpoint = endpoint;
-	transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT;
-	transfer->timeout = timeout;
-	transfer->buffer = buffer;
-	transfer->length = length;
-	transfer->user_data = user_data;
-	transfer->callback = callback;
-}
-
-/** \ingroup asyncio
- * Helper function to populate the required \ref libusb_transfer fields
- * for an isochronous transfer.
- *
- * \param transfer the transfer to populate
- * \param dev_handle handle of the device that will handle the transfer
- * \param endpoint address of the endpoint where this transfer will be sent
- * \param buffer data buffer
- * \param length length of data buffer
- * \param num_iso_packets the number of isochronous packets
- * \param callback callback function to be invoked on transfer completion
- * \param user_data user data to pass to callback function
- * \param timeout timeout for the transfer in milliseconds
- */
-static inline void libusb_fill_iso_transfer(struct libusb_transfer *transfer,
-	libusb_device_handle *dev_handle, unsigned char endpoint,
-	unsigned char *buffer, int length, int num_iso_packets,
-	libusb_transfer_cb_fn callback, void *user_data, unsigned int timeout)
-{
-	transfer->dev_handle = dev_handle;
-	transfer->endpoint = endpoint;
-	transfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
-	transfer->timeout = timeout;
-	transfer->buffer = buffer;
-	transfer->length = length;
-	transfer->num_iso_packets = num_iso_packets;
-	transfer->user_data = user_data;
-	transfer->callback = callback;
-}
-
-/** \ingroup asyncio
- * Convenience function to set the length of all packets in an isochronous
- * transfer, based on the num_iso_packets field in the transfer structure.
- *
- * \param transfer a transfer
- * \param length the length to set in each isochronous packet descriptor
- * \see libusb_get_max_packet_size()
- */
-static inline void libusb_set_iso_packet_lengths(
-	struct libusb_transfer *transfer, unsigned int length)
-{
-	int i;
-	for (i = 0; i < transfer->num_iso_packets; i++)
-		transfer->iso_packet_desc[i].length = length;
-}
-
-/** \ingroup asyncio
- * Convenience function to locate the position of an isochronous packet
- * within the buffer of an isochronous transfer.
- *
- * This is a thorough function which loops through all preceding packets,
- * accumulating their lengths to find the position of the specified packet.
- * Typically you will assign equal lengths to each packet in the transfer,
- * and hence the above method is sub-optimal. You may wish to use
- * libusb_get_iso_packet_buffer_simple() instead.
- *
- * \param transfer a transfer
- * \param packet the packet to return the address of
- * \returns the base address of the packet buffer inside the transfer buffer,
- * or NULL if the packet does not exist.
- * \see libusb_get_iso_packet_buffer_simple()
- */
-static inline unsigned char *libusb_get_iso_packet_buffer(
-	struct libusb_transfer *transfer, unsigned int packet)
-{
-	int i;
-	size_t offset = 0;
-	int _packet;
-
-	/* oops..slight bug in the API. packet is an unsigned int, but we use
-	 * signed integers almost everywhere else. range-check and convert to
-	 * signed to avoid compiler warnings. FIXME for libusb-2. */
-	if (packet > INT_MAX)
-		return NULL;
-	_packet = (int) packet;
-
-	if (_packet >= transfer->num_iso_packets)
-		return NULL;
-
-	for (i = 0; i < _packet; i++)
-		offset += transfer->iso_packet_desc[i].length;
-
-	return transfer->buffer + offset;
-}
-
-/** \ingroup asyncio
- * Convenience function to locate the position of an isochronous packet
- * within the buffer of an isochronous transfer, for transfers where each
- * packet is of identical size.
- *
- * This function relies on the assumption that every packet within the transfer
- * is of identical size to the first packet. Calculating the location of
- * the packet buffer is then just a simple calculation:
- * <tt>buffer + (packet_size * packet)</tt>
- *
- * Do not use this function on transfers other than those that have identical
- * packet lengths for each packet.
- *
- * \param transfer a transfer
- * \param packet the packet to return the address of
- * \returns the base address of the packet buffer inside the transfer buffer,
- * or NULL if the packet does not exist.
- * \see libusb_get_iso_packet_buffer()
- */
-static inline unsigned char *libusb_get_iso_packet_buffer_simple(
-	struct libusb_transfer *transfer, unsigned int packet)
-{
-	int _packet;
-
-	/* oops..slight bug in the API. packet is an unsigned int, but we use
-	 * signed integers almost everywhere else. range-check and convert to
-	 * signed to avoid compiler warnings. FIXME for libusb-2. */
-	if (packet > INT_MAX)
-		return NULL;
-	_packet = (int) packet;
-
-	if (_packet >= transfer->num_iso_packets)
-		return NULL;
-
-	return transfer->buffer + ((int) transfer->iso_packet_desc[0].length * _packet);
-}
-
-/* sync I/O */
-
-int LIBUSB_CALL libusb_control_transfer(libusb_device_handle *dev_handle,
-	uint8_t request_type, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
-	unsigned char *data, uint16_t wLength, unsigned int timeout);
-
-int LIBUSB_CALL libusb_bulk_transfer(libusb_device_handle *dev_handle,
-	unsigned char endpoint, unsigned char *data, int length,
-	int *actual_length, unsigned int timeout);
-
-int LIBUSB_CALL libusb_interrupt_transfer(libusb_device_handle *dev_handle,
-	unsigned char endpoint, unsigned char *data, int length,
-	int *actual_length, unsigned int timeout);
-
-/** \ingroup desc
- * Retrieve a descriptor from the default control pipe.
- * This is a convenience function which formulates the appropriate control
- * message to retrieve the descriptor.
- *
- * \param dev a device handle
- * \param desc_type the descriptor type, see \ref libusb_descriptor_type
- * \param desc_index the index of the descriptor to retrieve
- * \param data output buffer for descriptor
- * \param length size of data buffer
- * \returns number of bytes returned in data, or LIBUSB_ERROR code on failure
- */
-static inline int libusb_get_descriptor(libusb_device_handle *dev,
-	uint8_t desc_type, uint8_t desc_index, unsigned char *data, int length)
-{
-	return libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
-		LIBUSB_REQUEST_GET_DESCRIPTOR, (uint16_t) ((desc_type << 8) | desc_index),
-		0, data, (uint16_t) length, 1000);
-}
-
-/** \ingroup desc
- * Retrieve a descriptor from a device.
- * This is a convenience function which formulates the appropriate control
- * message to retrieve the descriptor. The string returned is Unicode, as
- * detailed in the USB specifications.
- *
- * \param dev a device handle
- * \param desc_index the index of the descriptor to retrieve
- * \param langid the language ID for the string descriptor
- * \param data output buffer for descriptor
- * \param length size of data buffer
- * \returns number of bytes returned in data, or LIBUSB_ERROR code on failure
- * \see libusb_get_string_descriptor_ascii()
- */
-static inline int libusb_get_string_descriptor(libusb_device_handle *dev,
-	uint8_t desc_index, uint16_t langid, unsigned char *data, int length)
-{
-	return libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
-		LIBUSB_REQUEST_GET_DESCRIPTOR, (uint16_t)((LIBUSB_DT_STRING << 8) | desc_index),
-		langid, data, (uint16_t) length, 1000);
-}
-
-int LIBUSB_CALL libusb_get_string_descriptor_ascii(libusb_device_handle *dev,
-	uint8_t desc_index, unsigned char *data, int length);
-
-/* polling and timeouts */
-
-int LIBUSB_CALL libusb_try_lock_events(libusb_context *ctx);
-void LIBUSB_CALL libusb_lock_events(libusb_context *ctx);
-void LIBUSB_CALL libusb_unlock_events(libusb_context *ctx);
-int LIBUSB_CALL libusb_event_handling_ok(libusb_context *ctx);
-int LIBUSB_CALL libusb_event_handler_active(libusb_context *ctx);
-void LIBUSB_CALL libusb_lock_event_waiters(libusb_context *ctx);
-void LIBUSB_CALL libusb_unlock_event_waiters(libusb_context *ctx);
-int LIBUSB_CALL libusb_wait_for_event(libusb_context *ctx, struct timeval *tv);
-
-int LIBUSB_CALL libusb_handle_events_timeout(libusb_context *ctx,
-	struct timeval *tv);
-int LIBUSB_CALL libusb_handle_events_timeout_completed(libusb_context *ctx,
-	struct timeval *tv, int *completed);
-int LIBUSB_CALL libusb_handle_events(libusb_context *ctx);
-int LIBUSB_CALL libusb_handle_events_completed(libusb_context *ctx, int *completed);
-int LIBUSB_CALL libusb_handle_events_locked(libusb_context *ctx,
-	struct timeval *tv);
-int LIBUSB_CALL libusb_pollfds_handle_timeouts(libusb_context *ctx);
-int LIBUSB_CALL libusb_get_next_timeout(libusb_context *ctx,
-	struct timeval *tv);
-
-/** \ingroup poll
- * File descriptor for polling
- */
-struct libusb_pollfd {
-	/** Numeric file descriptor */
-	int fd;
-
-	/** Event flags to poll for from <poll.h>. POLLIN indicates that you
-	 * should monitor this file descriptor for becoming ready to read from,
-	 * and POLLOUT indicates that you should monitor this file descriptor for
-	 * nonblocking write readiness. */
-	short events;
-};
-
-/** \ingroup poll
- * Callback function, invoked when a new file descriptor should be added
- * to the set of file descriptors monitored for events.
- * \param fd the new file descriptor
- * \param events events to monitor for, see \ref libusb_pollfd for a
- * description
- * \param user_data User data pointer specified in
- * libusb_set_pollfd_notifiers() call
- * \see libusb_set_pollfd_notifiers()
- */
-typedef void (LIBUSB_CALL *libusb_pollfd_added_cb)(int fd, short events,
-	void *user_data);
-
-/** \ingroup poll
- * Callback function, invoked when a file descriptor should be removed from
- * the set of file descriptors being monitored for events. After returning
- * from this callback, do not use that file descriptor again.
- * \param fd the file descriptor to stop monitoring
- * \param user_data User data pointer specified in
- * libusb_set_pollfd_notifiers() call
- * \see libusb_set_pollfd_notifiers()
- */
-typedef void (LIBUSB_CALL *libusb_pollfd_removed_cb)(int fd, void *user_data);
-
-const struct libusb_pollfd ** LIBUSB_CALL libusb_get_pollfds(
-	libusb_context *ctx);
-void LIBUSB_CALL libusb_set_pollfd_notifiers(libusb_context *ctx,
-	libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,
-	void *user_data);
-
-/** \ingroup hotplug
- * Callback handle.
- *
- * Callbacks handles are generated by libusb_hotplug_register_callback()
- * and can be used to deregister callbacks. Callback handles are unique
- * per libusb_context and it is safe to call libusb_hotplug_deregister_callback()
- * on an already deregisted callback.
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- *
- * For more information, see \ref hotplug.
- */
-typedef int libusb_hotplug_callback_handle;
-
-/** \ingroup hotplug
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- *
- * Flags for hotplug events */
-typedef enum {
-	/** Arm the callback and fire it for all matching currently attached devices. */
-	LIBUSB_HOTPLUG_ENUMERATE = 1,
-} libusb_hotplug_flag;
-
-/** \ingroup hotplug
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- *
- * Hotplug events */
-typedef enum {
-	/** A device has been plugged in and is ready to use */
-	LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED = 0x01,
-
-	/** A device has left and is no longer available.
-	 * It is the user's responsibility to call libusb_close on any handle associated with a disconnected device.
-	 * It is safe to call libusb_get_device_descriptor on a device that has left */
-	LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT    = 0x02,
-} libusb_hotplug_event;
-
-/** \ingroup hotplug
- * Wildcard matching for hotplug events */
-#define LIBUSB_HOTPLUG_MATCH_ANY -1
-
-/** \ingroup hotplug
- * Hotplug callback function type. When requesting hotplug event notifications,
- * you pass a pointer to a callback function of this type.
- *
- * This callback may be called by an internal event thread and as such it is
- * recommended the callback do minimal processing before returning.
- *
- * libusbx will call this function later, when a matching event had happened on
- * a matching device. See \ref hotplug for more information.
- *
- * It is safe to call either libusb_hotplug_register_callback() or
- * libusb_hotplug_deregister_callback() from within a callback function.
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- *
- * \param libusb_context context of this notification
- * \param device         libusb_device this event occurred on
- * \param event          event that occurred
- * \param user_data      user data provided when this callback was registered
- * \returns bool whether this callback is finished processing events.
- *                       returning 1 will cause this callback to be deregistered
- */
-typedef int (LIBUSB_CALL *libusb_hotplug_callback_fn)(libusb_context *ctx,
-						libusb_device *device,
-						libusb_hotplug_event event,
-						void *user_data);
-
-/** \ingroup hotplug
- * Register a hotplug callback function
- *
- * Register a callback with the libusb_context. The callback will fire
- * when a matching event occurs on a matching device. The callback is
- * armed until either it is deregistered with libusb_hotplug_deregister_callback()
- * or the supplied callback returns 1 to indicate it is finished processing events.
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- *
- * \param[in] ctx context to register this callback with
- * \param[in] events bitwise or of events that will trigger this callback. See \ref
- *            libusb_hotplug_event
- * \param[in] flags hotplug callback flags. See \ref libusb_hotplug_flag
- * \param[in] vendor_id the vendor id to match or \ref LIBUSB_HOTPLUG_MATCH_ANY
- * \param[in] product_id the product id to match or \ref LIBUSB_HOTPLUG_MATCH_ANY
- * \param[in] dev_class the device class to match or \ref LIBUSB_HOTPLUG_MATCH_ANY
- * \param[in] cb_fn the function to be invoked on a matching event/device
- * \param[in] user_data user data to pass to the callback function
- * \param[out] handle pointer to store the handle of the allocated callback (can be NULL)
- * \returns LIBUSB_SUCCESS on success LIBUSB_ERROR code on failure
- */
-int LIBUSB_CALL libusb_hotplug_register_callback(libusb_context *ctx,
-						libusb_hotplug_event events,
-						libusb_hotplug_flag flags,
-						int vendor_id, int product_id,
-						int dev_class,
-						libusb_hotplug_callback_fn cb_fn,
-						void *user_data,
-						libusb_hotplug_callback_handle *handle);
-
-/** \ingroup hotplug
- * Deregisters a hotplug callback.
- *
- * Deregister a callback from a libusb_context. This function is safe to call from within
- * a hotplug callback.
- *
- * Since version 1.0.16, \ref LIBUSBX_API_VERSION >= 0x01000102
- *
- * \param[in] ctx context this callback is registered with
- * \param[in] handle the handle of the callback to deregister
- */
-void LIBUSB_CALL libusb_hotplug_deregister_callback(libusb_context *ctx,
-						libusb_hotplug_callback_handle handle);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/libusbi.h b/src/3rd_party-static/libusbx-1.0.16/libusb/libusbi.h
deleted file mode 100644
index 02efae300d..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/libusbi.h
+++ /dev/null
@@ -1,1004 +0,0 @@
-/*
- * Internal header for libusbx
- * Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef LIBUSBI_H
-#define LIBUSBI_H
-
-#include "config.h"
-
-#include <stddef.h>
-#include <stdint.h>
-#include <time.h>
-#include <stdarg.h>
-#ifdef HAVE_POLL_H
-#include <poll.h>
-#endif
-
-#ifdef HAVE_MISSING_H
-#include "missing.h"
-#endif
-#include "libusb.h"
-#include "version.h"
-
-/* Inside the libusbx code, mark all public functions as follows:
- *   return_type API_EXPORTED function_name(params) { ... }
- * But if the function returns a pointer, mark it as follows:
- *   DEFAULT_VISIBILITY return_type * LIBUSB_CALL function_name(params) { ... }
- * In the libusbx public header, mark all declarations as:
- *   return_type LIBUSB_CALL function_name(params);
- */
-#define API_EXPORTED LIBUSB_CALL DEFAULT_VISIBILITY
-
-#define DEVICE_DESC_LENGTH		18
-
-#define USB_MAXENDPOINTS	32
-#define USB_MAXINTERFACES	32
-#define USB_MAXCONFIG		8
-
-/* Backend specific capabilities */
-#define USBI_CAP_HAS_HID_ACCESS					0x00010000
-#define USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER	0x00020000
-
-/* Maximum number of bytes in a log line */
-#define USBI_MAX_LOG_LEN	1024
-/* Terminator for log lines */
-#define USBI_LOG_LINE_END	"\n"
-
-/* The following is used to silence warnings for unused variables */
-#define UNUSED(var)			do { (void)(var); } while(0)
-
-#if !defined(ARRAYSIZE)
-#define ARRAYSIZE(array) (sizeof(array)/sizeof(array[0]))
-#endif
-
-struct list_head {
-	struct list_head *prev, *next;
-};
-
-/* Get an entry from the list
- *  ptr - the address of this list_head element in "type"
- *  type - the data type that contains "member"
- *  member - the list_head element in "type"
- */
-#define list_entry(ptr, type, member) \
-	((type *)((uintptr_t)(ptr) - (uintptr_t)offsetof(type, member)))
-
-/* Get each entry from a list
- *  pos - A structure pointer has a "member" element
- *  head - list head
- *  member - the list_head element in "pos"
- *  type - the type of the first parameter
- */
-#define list_for_each_entry(pos, head, member, type)			\
-	for (pos = list_entry((head)->next, type, member);			\
-		 &pos->member != (head);								\
-		 pos = list_entry(pos->member.next, type, member))
-
-#define list_for_each_entry_safe(pos, n, head, member, type)	\
-	for (pos = list_entry((head)->next, type, member),			\
-		 n = list_entry(pos->member.next, type, member);		\
-		 &pos->member != (head);								\
-		 pos = n, n = list_entry(n->member.next, type, member))
-
-#define list_empty(entry) ((entry)->next == (entry))
-
-static inline void list_init(struct list_head *entry)
-{
-	entry->prev = entry->next = entry;
-}
-
-static inline void list_add(struct list_head *entry, struct list_head *head)
-{
-	entry->next = head->next;
-	entry->prev = head;
-
-	head->next->prev = entry;
-	head->next = entry;
-}
-
-static inline void list_add_tail(struct list_head *entry,
-	struct list_head *head)
-{
-	entry->next = head;
-	entry->prev = head->prev;
-
-	head->prev->next = entry;
-	head->prev = entry;
-}
-
-static inline void list_del(struct list_head *entry)
-{
-	entry->next->prev = entry->prev;
-	entry->prev->next = entry->next;
-	entry->next = entry->prev = NULL;
-}
-
-static inline void *usbi_reallocf(void *ptr, size_t size)
-{
-	void *ret = realloc(ptr, size);
-	if (!ret)
-		free(ptr);
-	return ret;
-}
-
-#define container_of(ptr, type, member) ({                      \
-        const typeof( ((type *)0)->member ) *mptr = (ptr);    \
-        (type *)( (char *)mptr - offsetof(type,member) );})
-
-#define MIN(a, b)	((a) < (b) ? (a) : (b))
-#define MAX(a, b)	((a) > (b) ? (a) : (b))
-
-#define TIMESPEC_IS_SET(ts) ((ts)->tv_sec != 0 || (ts)->tv_nsec != 0)
-
-void usbi_log(struct libusb_context *ctx, enum libusb_log_level level,
-	const char *function, const char *format, ...);
-
-void usbi_log_v(struct libusb_context *ctx, enum libusb_log_level level,
-	const char *function, const char *format, va_list args);
-
-#if !defined(_MSC_VER) || _MSC_VER >= 1400
-
-#ifdef ENABLE_LOGGING
-#define _usbi_log(ctx, level, ...) usbi_log(ctx, level, __FUNCTION__, __VA_ARGS__)
-#define usbi_dbg(...) _usbi_log(NULL, LIBUSB_LOG_LEVEL_DEBUG, __VA_ARGS__)
-#else
-#define _usbi_log(ctx, level, ...) do { (void)(ctx); } while(0)
-#define usbi_dbg(...) do {} while(0)
-#endif
-
-#define usbi_info(ctx, ...) _usbi_log(ctx, LIBUSB_LOG_LEVEL_INFO, __VA_ARGS__)
-#define usbi_warn(ctx, ...) _usbi_log(ctx, LIBUSB_LOG_LEVEL_WARNING, __VA_ARGS__)
-#define usbi_err(ctx, ...) _usbi_log(ctx, LIBUSB_LOG_LEVEL_ERROR, __VA_ARGS__)
-
-#else /* !defined(_MSC_VER) || _MSC_VER >= 1400 */
-
-#ifdef ENABLE_LOGGING
-#define LOG_BODY(ctxt, level) \
-{                             \
-	va_list args;             \
-	va_start (args, format);  \
-	usbi_log_v(ctxt, level, "", format, args); \
-	va_end(args);             \
-}
-#else
-#define LOG_BODY(ctxt, level) do { (void)(ctxt); } while(0)
-#endif
-
-static inline void usbi_info(struct libusb_context *ctx, const char *format,
-	...)
-	LOG_BODY(ctx,LIBUSB_LOG_LEVEL_INFO)
-static inline void usbi_warn(struct libusb_context *ctx, const char *format,
-	...)
-	LOG_BODY(ctx,LIBUSB_LOG_LEVEL_WARNING)
-static inline void usbi_err( struct libusb_context *ctx, const char *format,
-	...)
-	LOG_BODY(ctx,LIBUSB_LOG_LEVEL_ERROR)
-
-static inline void usbi_dbg(const char *format, ...)
-	LOG_BODY(NULL,LIBUSB_LOG_LEVEL_DEBUG)
-
-#endif /* !defined(_MSC_VER) || _MSC_VER >= 1400 */
-
-#define USBI_GET_CONTEXT(ctx) if (!(ctx)) (ctx) = usbi_default_context
-#define DEVICE_CTX(dev) ((dev)->ctx)
-#define HANDLE_CTX(handle) (DEVICE_CTX((handle)->dev))
-#define TRANSFER_CTX(transfer) (HANDLE_CTX((transfer)->dev_handle))
-#define ITRANSFER_CTX(transfer) \
-	(TRANSFER_CTX(USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer)))
-
-#define IS_EPIN(ep) (0 != ((ep) & LIBUSB_ENDPOINT_IN))
-#define IS_EPOUT(ep) (!IS_EPIN(ep))
-#define IS_XFERIN(xfer) (0 != ((xfer)->endpoint & LIBUSB_ENDPOINT_IN))
-#define IS_XFEROUT(xfer) (!IS_XFERIN(xfer))
-
-/* Internal abstraction for thread synchronization */
-#if defined(THREADS_POSIX)
-#include "os/threads_posix.h"
-#elif defined(OS_WINDOWS) || defined(OS_WINCE)
-#include <os/threads_windows.h>
-#endif
-
-extern struct libusb_context *usbi_default_context;
-
-struct libusb_context {
-	int debug;
-	int debug_fixed;
-
-	/* internal control pipe, used for interrupting event handling when
-	 * something needs to modify poll fds. */
-	int ctrl_pipe[2];
-
-	struct list_head usb_devs;
-	usbi_mutex_t usb_devs_lock;
-
-	/* A list of open handles. Backends are free to traverse this if required.
-	 */
-	struct list_head open_devs;
-	usbi_mutex_t open_devs_lock;
-
-	/* A list of registered hotplug callbacks */
-	struct list_head hotplug_cbs;
-	usbi_mutex_t hotplug_cbs_lock;
-	int hotplug_pipe[2];
-
-	/* this is a list of in-flight transfer handles, sorted by timeout
-	 * expiration. URBs to timeout the soonest are placed at the beginning of
-	 * the list, URBs that will time out later are placed after, and urbs with
-	 * infinite timeout are always placed at the very end. */
-	struct list_head flying_transfers;
-	usbi_mutex_t flying_transfers_lock;
-
-	/* list of poll fds */
-	struct list_head pollfds;
-	usbi_mutex_t pollfds_lock;
-
-	/* a counter that is set when we want to interrupt event handling, in order
-	 * to modify the poll fd set. and a lock to protect it. */
-	unsigned int pollfd_modify;
-	usbi_mutex_t pollfd_modify_lock;
-
-	/* user callbacks for pollfd changes */
-	libusb_pollfd_added_cb fd_added_cb;
-	libusb_pollfd_removed_cb fd_removed_cb;
-	void *fd_cb_user_data;
-
-	/* ensures that only one thread is handling events at any one time */
-	usbi_mutex_t events_lock;
-
-	/* used to see if there is an active thread doing event handling */
-	int event_handler_active;
-
-	/* used to wait for event completion in threads other than the one that is
-	 * event handling */
-	usbi_mutex_t event_waiters_lock;
-	usbi_cond_t event_waiters_cond;
-
-#ifdef USBI_TIMERFD_AVAILABLE
-	/* used for timeout handling, if supported by OS.
-	 * this timerfd is maintained to trigger on the next pending timeout */
-	int timerfd;
-#endif
-
-	struct list_head list;
-};
-
-#ifdef USBI_TIMERFD_AVAILABLE
-#define usbi_using_timerfd(ctx) ((ctx)->timerfd >= 0)
-#else
-#define usbi_using_timerfd(ctx) (0)
-#endif
-
-struct libusb_device {
-	/* lock protects refcnt, everything else is finalized at initialization
-	 * time */
-	usbi_mutex_t lock;
-	int refcnt;
-
-	struct libusb_context *ctx;
-
-	uint8_t bus_number;
-	uint8_t port_number;
-	struct libusb_device* parent_dev;
-	uint8_t device_address;
-	uint8_t num_configurations;
-	enum libusb_speed speed;
-
-	struct list_head list;
-	unsigned long session_data;
-
-	struct libusb_device_descriptor device_descriptor;
-	int attached;
-
-	unsigned char os_priv
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-	[] /* valid C99 code */
-#else
-	[0] /* non-standard, but usually working code */
-#endif
-	;
-};
-
-struct libusb_device_handle {
-	/* lock protects claimed_interfaces */
-	usbi_mutex_t lock;
-	unsigned long claimed_interfaces;
-
-	struct list_head list;
-	struct libusb_device *dev;
-	int auto_detach_kernel_driver;
-	unsigned char os_priv
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-	[] /* valid C99 code */
-#else
-	[0] /* non-standard, but usually working code */
-#endif
-	;
-};
-
-enum {
-  USBI_CLOCK_MONOTONIC,
-  USBI_CLOCK_REALTIME
-};
-
-/* in-memory transfer layout:
- *
- * 1. struct usbi_transfer
- * 2. struct libusb_transfer (which includes iso packets) [variable size]
- * 3. os private data [variable size]
- *
- * from a libusb_transfer, you can get the usbi_transfer by rewinding the
- * appropriate number of bytes.
- * the usbi_transfer includes the number of allocated packets, so you can
- * determine the size of the transfer and hence the start and length of the
- * OS-private data.
- */
-
-struct usbi_transfer {
-	int num_iso_packets;
-	struct list_head list;
-	struct timeval timeout;
-	int transferred;
-	uint8_t flags;
-
-	/* this lock is held during libusb_submit_transfer() and
-	 * libusb_cancel_transfer() (allowing the OS backend to prevent duplicate
-	 * cancellation, submission-during-cancellation, etc). the OS backend
-	 * should also take this lock in the handle_events path, to prevent the user
-	 * cancelling the transfer from another thread while you are processing
-	 * its completion (presumably there would be races within your OS backend
-	 * if this were possible). */
-	usbi_mutex_t lock;
-};
-
-enum usbi_transfer_flags {
-	/* The transfer has timed out */
-	USBI_TRANSFER_TIMED_OUT = 1 << 0,
-
-	/* Set by backend submit_transfer() if the OS handles timeout */
-	USBI_TRANSFER_OS_HANDLES_TIMEOUT = 1 << 1,
-
-	/* Cancellation was requested via libusb_cancel_transfer() */
-	USBI_TRANSFER_CANCELLING = 1 << 2,
-
-	/* Operation on the transfer failed because the device disappeared */
-	USBI_TRANSFER_DEVICE_DISAPPEARED = 1 << 3,
-
-	/* Set by backend submit_transfer() if the fds in use have been updated */
-	USBI_TRANSFER_UPDATED_FDS = 1 << 4,
-};
-
-#define USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer) \
-	((struct libusb_transfer *)(((unsigned char *)(transfer)) \
-		+ sizeof(struct usbi_transfer)))
-#define LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer) \
-	((struct usbi_transfer *)(((unsigned char *)(transfer)) \
-		- sizeof(struct usbi_transfer)))
-
-static inline void *usbi_transfer_get_os_priv(struct usbi_transfer *transfer)
-{
-	return ((unsigned char *)transfer) + sizeof(struct usbi_transfer)
-		+ sizeof(struct libusb_transfer)
-		+ (transfer->num_iso_packets
-			* sizeof(struct libusb_iso_packet_descriptor));
-}
-
-/* bus structures */
-
-/* All standard descriptors have these 2 fields in common */
-struct usb_descriptor_header {
-	uint8_t  bLength;
-	uint8_t  bDescriptorType;
-};
-
-/* shared data and functions */
-
-int usbi_io_init(struct libusb_context *ctx);
-void usbi_io_exit(struct libusb_context *ctx);
-
-struct libusb_device *usbi_alloc_device(struct libusb_context *ctx,
-	unsigned long session_id);
-struct libusb_device *usbi_get_device_by_session_id(struct libusb_context *ctx,
-	unsigned long session_id);
-int usbi_sanitize_device(struct libusb_device *dev);
-void usbi_handle_disconnect(struct libusb_device_handle *handle);
-
-int usbi_handle_transfer_completion(struct usbi_transfer *itransfer,
-	enum libusb_transfer_status status);
-int usbi_handle_transfer_cancellation(struct usbi_transfer *transfer);
-
-int usbi_parse_descriptor(const unsigned char *source, const char *descriptor,
-	void *dest, int host_endian);
-int usbi_device_cache_descriptor(libusb_device *dev);
-int usbi_get_config_index_by_value(struct libusb_device *dev,
-	uint8_t bConfigurationValue, int *idx);
-
-void usbi_connect_device (struct libusb_device *dev);
-void usbi_disconnect_device (struct libusb_device *dev);
-
-/* Internal abstraction for poll (needs struct usbi_transfer on Windows) */
-#if defined(OS_LINUX) || defined(OS_DARWIN) || defined(OS_OPENBSD)
-#include <unistd.h>
-#include "os/poll_posix.h"
-#elif defined(OS_WINDOWS) || defined(OS_WINCE)
-#include "os/poll_windows.h"
-#endif
-
-#if (defined(OS_WINDOWS) || defined(OS_WINCE)) && !defined(__GNUC__)
-#define snprintf _snprintf
-#define vsnprintf _vsnprintf
-int usbi_gettimeofday(struct timeval *tp, void *tzp);
-#define LIBUSB_GETTIMEOFDAY_WIN32
-#define HAVE_USBI_GETTIMEOFDAY
-#else
-#ifdef HAVE_GETTIMEOFDAY
-#define usbi_gettimeofday(tv, tz) gettimeofday((tv), (tz))
-#define HAVE_USBI_GETTIMEOFDAY
-#endif
-#endif
-
-struct usbi_pollfd {
-	/* must come first */
-	struct libusb_pollfd pollfd;
-
-	struct list_head list;
-};
-
-int usbi_add_pollfd(struct libusb_context *ctx, int fd, short events);
-void usbi_remove_pollfd(struct libusb_context *ctx, int fd);
-void usbi_fd_notification(struct libusb_context *ctx);
-
-/* device discovery */
-
-/* we traverse usbfs without knowing how many devices we are going to find.
- * so we create this discovered_devs model which is similar to a linked-list
- * which grows when required. it can be freed once discovery has completed,
- * eliminating the need for a list node in the libusb_device structure
- * itself. */
-struct discovered_devs {
-	size_t len;
-	size_t capacity;
-	struct libusb_device *devices
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
-	[] /* valid C99 code */
-#else
-	[0] /* non-standard, but usually working code */
-#endif
-	;
-};
-
-struct discovered_devs *discovered_devs_append(
-	struct discovered_devs *discdevs, struct libusb_device *dev);
-
-/* OS abstraction */
-
-/* This is the interface that OS backends need to implement.
- * All fields are mandatory, except ones explicitly noted as optional. */
-struct usbi_os_backend {
-	/* A human-readable name for your backend, e.g. "Linux usbfs" */
-	const char *name;
-
-	/* Binary mask for backend specific capabilities */
-	uint32_t caps;
-
-	/* Perform initialization of your backend. You might use this function
-	 * to determine specific capabilities of the system, allocate required
-	 * data structures for later, etc.
-	 *
-	 * This function is called when a libusbx user initializes the library
-	 * prior to use.
-	 *
-	 * Return 0 on success, or a LIBUSB_ERROR code on failure.
-	 */
-	int (*init)(struct libusb_context *ctx);
-
-	/* Deinitialization. Optional. This function should destroy anything
-	 * that was set up by init.
-	 *
-	 * This function is called when the user deinitializes the library.
-	 */
-	void (*exit)(void);
-
-	/* Enumerate all the USB devices on the system, returning them in a list
-	 * of discovered devices.
-	 *
-	 * Your implementation should enumerate all devices on the system,
-	 * regardless of whether they have been seen before or not.
-	 *
-	 * When you have found a device, compute a session ID for it. The session
-	 * ID should uniquely represent that particular device for that particular
-	 * connection session since boot (i.e. if you disconnect and reconnect a
-	 * device immediately after, it should be assigned a different session ID).
-	 * If your OS cannot provide a unique session ID as described above,
-	 * presenting a session ID of (bus_number << 8 | device_address) should
-	 * be sufficient. Bus numbers and device addresses wrap and get reused,
-	 * but that is an unlikely case.
-	 *
-	 * After computing a session ID for a device, call
-	 * usbi_get_device_by_session_id(). This function checks if libusbx already
-	 * knows about the device, and if so, it provides you with a libusb_device
-	 * structure for it.
-	 *
-	 * If usbi_get_device_by_session_id() returns NULL, it is time to allocate
-	 * a new device structure for the device. Call usbi_alloc_device() to
-	 * obtain a new libusb_device structure with reference count 1. Populate
-	 * the bus_number and device_address attributes of the new device, and
-	 * perform any other internal backend initialization you need to do. At
-	 * this point, you should be ready to provide device descriptors and so
-	 * on through the get_*_descriptor functions. Finally, call
-	 * usbi_sanitize_device() to perform some final sanity checks on the
-	 * device. Assuming all of the above succeeded, we can now continue.
-	 * If any of the above failed, remember to unreference the device that
-	 * was returned by usbi_alloc_device().
-	 *
-	 * At this stage we have a populated libusb_device structure (either one
-	 * that was found earlier, or one that we have just allocated and
-	 * populated). This can now be added to the discovered devices list
-	 * using discovered_devs_append(). Note that discovered_devs_append()
-	 * may reallocate the list, returning a new location for it, and also
-	 * note that reallocation can fail. Your backend should handle these
-	 * error conditions appropriately.
-	 *
-	 * This function should not generate any bus I/O and should not block.
-	 * If I/O is required (e.g. reading the active configuration value), it is
-	 * OK to ignore these suggestions :)
-	 *
-	 * This function is executed when the user wishes to retrieve a list
-	 * of USB devices connected to the system.
-	 *
-	 * If the backend has hotplug support, this function is not used!
-	 *
-	 * Return 0 on success, or a LIBUSB_ERROR code on failure.
-	 */
-	int (*get_device_list)(struct libusb_context *ctx,
-		struct discovered_devs **discdevs);
-
-	/* Apps which were written before hotplug support, may listen for
-	 * hotplug events on their own and call libusb_get_device_list on
-	 * device addition. In this case libusb_get_device_list will likely
-	 * return a list without the new device in there, as the hotplug
-	 * event thread will still be busy enumerating the device, which may
-	 * take a while, or may not even have seen the event yet.
-	 *
-	 * To avoid this libusb_get_device_list will call this optional
-	 * function for backends with hotplug support before copying
-	 * ctx->usb_devs to the user. In this function the backend should
-	 * ensure any pending hotplug events are fully processed before
-	 * returning.
-	 *
-	 * Optional, should be implemented by backends with hotplug support.
-	 */
-	void (*hotplug_poll)(void);
-
-	/* Open a device for I/O and other USB operations. The device handle
-	 * is preallocated for you, you can retrieve the device in question
-	 * through handle->dev.
-	 *
-	 * Your backend should allocate any internal resources required for I/O
-	 * and other operations so that those operations can happen (hopefully)
-	 * without hiccup. This is also a good place to inform libusbx that it
-	 * should monitor certain file descriptors related to this device -
-	 * see the usbi_add_pollfd() function.
-	 *
-	 * This function should not generate any bus I/O and should not block.
-	 *
-	 * This function is called when the user attempts to obtain a device
-	 * handle for a device.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_ACCESS if the user has insufficient permissions
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since
-	 *   discovery
-	 * - another LIBUSB_ERROR code on other failure
-	 *
-	 * Do not worry about freeing the handle on failed open, the upper layers
-	 * do this for you.
-	 */
-	int (*open)(struct libusb_device_handle *handle);
-
-	/* Close a device such that the handle cannot be used again. Your backend
-	 * should destroy any resources that were allocated in the open path.
-	 * This may also be a good place to call usbi_remove_pollfd() to inform
-	 * libusbx of any file descriptors associated with this device that should
-	 * no longer be monitored.
-	 *
-	 * This function is called when the user closes a device handle.
-	 */
-	void (*close)(struct libusb_device_handle *handle);
-
-	/* Retrieve the device descriptor from a device.
-	 *
-	 * The descriptor should be retrieved from memory, NOT via bus I/O to the
-	 * device. This means that you may have to cache it in a private structure
-	 * during get_device_list enumeration. Alternatively, you may be able
-	 * to retrieve it from a kernel interface (some Linux setups can do this)
-	 * still without generating bus I/O.
-	 *
-	 * This function is expected to write DEVICE_DESC_LENGTH (18) bytes into
-	 * buffer, which is guaranteed to be big enough.
-	 *
-	 * This function is called when sanity-checking a device before adding
-	 * it to the list of discovered devices, and also when the user requests
-	 * to read the device descriptor.
-	 *
-	 * This function is expected to return the descriptor in bus-endian format
-	 * (LE). If it returns the multi-byte values in host-endian format,
-	 * set the host_endian output parameter to "1".
-	 *
-	 * Return 0 on success or a LIBUSB_ERROR code on failure.
-	 */
-	int (*get_device_descriptor)(struct libusb_device *device,
-		unsigned char *buffer, int *host_endian);
-
-	/* Get the ACTIVE configuration descriptor for a device.
-	 *
-	 * The descriptor should be retrieved from memory, NOT via bus I/O to the
-	 * device. This means that you may have to cache it in a private structure
-	 * during get_device_list enumeration. You may also have to keep track
-	 * of which configuration is active when the user changes it.
-	 *
-	 * This function is expected to write len bytes of data into buffer, which
-	 * is guaranteed to be big enough. If you can only do a partial write,
-	 * return an error code.
-	 *
-	 * This function is expected to return the descriptor in bus-endian format
-	 * (LE). If it returns the multi-byte values in host-endian format,
-	 * set the host_endian output parameter to "1".
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if the device is in unconfigured state
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*get_active_config_descriptor)(struct libusb_device *device,
-		unsigned char *buffer, size_t len, int *host_endian);
-
-	/* Get a specific configuration descriptor for a device.
-	 *
-	 * The descriptor should be retrieved from memory, NOT via bus I/O to the
-	 * device. This means that you may have to cache it in a private structure
-	 * during get_device_list enumeration.
-	 *
-	 * The requested descriptor is expressed as a zero-based index (i.e. 0
-	 * indicates that we are requesting the first descriptor). The index does
-	 * not (necessarily) equal the bConfigurationValue of the configuration
-	 * being requested.
-	 *
-	 * This function is expected to write len bytes of data into buffer, which
-	 * is guaranteed to be big enough. If you can only do a partial write,
-	 * return an error code.
-	 *
-	 * This function is expected to return the descriptor in bus-endian format
-	 * (LE). If it returns the multi-byte values in host-endian format,
-	 * set the host_endian output parameter to "1".
-	 *
-	 * Return 0 on success or a LIBUSB_ERROR code on failure.
-	 */
-	int (*get_config_descriptor)(struct libusb_device *device,
-		uint8_t config_index, unsigned char *buffer, size_t len,
-		int *host_endian);
-
-	/* Like get_config_descriptor but then by bConfigurationValue instead
-	 * of by index.
-	 *
-	 * Optional, if not present the core will call get_config_descriptor
-	 * for all configs until it finds the desired bConfigurationValue.
-	 *
-	 * Returns a pointer to the raw-descriptor in *buffer, this memory
-	 * is valid as long as device is valid.
-	 *
-	 * Returns the length of the returned raw-descriptor on success,
-	 * or a LIBUSB_ERROR code on failure.
-	 */
-	int (*get_config_descriptor_by_value)(struct libusb_device *device,
-		uint8_t bConfigurationValue, unsigned char **buffer,
-		int *host_endian);
-
-	/* Get the bConfigurationValue for the active configuration for a device.
-	 * Optional. This should only be implemented if you can retrieve it from
-	 * cache (don't generate I/O).
-	 *
-	 * If you cannot retrieve this from cache, either do not implement this
-	 * function, or return LIBUSB_ERROR_NOT_SUPPORTED. This will cause
-	 * libusbx to retrieve the information through a standard control transfer.
-	 *
-	 * This function must be non-blocking.
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - LIBUSB_ERROR_NOT_SUPPORTED if the value cannot be retrieved without
-	 *   blocking
-	 * - another LIBUSB_ERROR code on other failure.
-	 */
-	int (*get_configuration)(struct libusb_device_handle *handle, int *config);
-
-	/* Set the active configuration for a device.
-	 *
-	 * A configuration value of -1 should put the device in unconfigured state.
-	 *
-	 * This function can block.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
-	 * - LIBUSB_ERROR_BUSY if interfaces are currently claimed (and hence
-	 *   configuration cannot be changed)
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure.
-	 */
-	int (*set_configuration)(struct libusb_device_handle *handle, int config);
-
-	/* Claim an interface. When claimed, the application can then perform
-	 * I/O to an interface's endpoints.
-	 *
-	 * This function should not generate any bus I/O and should not block.
-	 * Interface claiming is a logical operation that simply ensures that
-	 * no other drivers/applications are using the interface, and after
-	 * claiming, no other drivers/applicatiosn can use the interface because
-	 * we now "own" it.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if the interface does not exist
-	 * - LIBUSB_ERROR_BUSY if the interface is in use by another driver/app
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*claim_interface)(struct libusb_device_handle *handle, int interface_number);
-
-	/* Release a previously claimed interface.
-	 *
-	 * This function should also generate a SET_INTERFACE control request,
-	 * resetting the alternate setting of that interface to 0. It's OK for
-	 * this function to block as a result.
-	 *
-	 * You will only ever be asked to release an interface which was
-	 * successfully claimed earlier.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*release_interface)(struct libusb_device_handle *handle, int interface_number);
-
-	/* Set the alternate setting for an interface.
-	 *
-	 * You will only ever be asked to set the alternate setting for an
-	 * interface which was successfully claimed earlier.
-	 *
-	 * It's OK for this function to block.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if the alternate setting does not exist
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*set_interface_altsetting)(struct libusb_device_handle *handle,
-		int interface_number, int altsetting);
-
-	/* Clear a halt/stall condition on an endpoint.
-	 *
-	 * It's OK for this function to block.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*clear_halt)(struct libusb_device_handle *handle,
-		unsigned char endpoint);
-
-	/* Perform a USB port reset to reinitialize a device.
-	 *
-	 * If possible, the handle should still be usable after the reset
-	 * completes, assuming that the device descriptors did not change during
-	 * reset and all previous interface state can be restored.
-	 *
-	 * If something changes, or you cannot easily locate/verify the resetted
-	 * device, return LIBUSB_ERROR_NOT_FOUND. This prompts the application
-	 * to close the old handle and re-enumerate the device.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if re-enumeration is required, or if the device
-	 *   has been disconnected since it was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*reset_device)(struct libusb_device_handle *handle);
-
-	/* Determine if a kernel driver is active on an interface. Optional.
-	 *
-	 * The presence of a kernel driver on an interface indicates that any
-	 * calls to claim_interface would fail with the LIBUSB_ERROR_BUSY code.
-	 *
-	 * Return:
-	 * - 0 if no driver is active
-	 * - 1 if a driver is active
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*kernel_driver_active)(struct libusb_device_handle *handle,
-		int interface_number);
-
-	/* Detach a kernel driver from an interface. Optional.
-	 *
-	 * After detaching a kernel driver, the interface should be available
-	 * for claim.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if no kernel driver was active
-	 * - LIBUSB_ERROR_INVALID_PARAM if the interface does not exist
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*detach_kernel_driver)(struct libusb_device_handle *handle,
-		int interface_number);
-
-	/* Attach a kernel driver to an interface. Optional.
-	 *
-	 * Reattach a kernel driver to the device.
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NOT_FOUND if no kernel driver was active
-	 * - LIBUSB_ERROR_INVALID_PARAM if the interface does not exist
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected since it
-	 *   was opened
-	 * - LIBUSB_ERROR_BUSY if a program or driver has claimed the interface,
-	 *   preventing reattachment
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*attach_kernel_driver)(struct libusb_device_handle *handle,
-		int interface_number);
-
-	/* Destroy a device. Optional.
-	 *
-	 * This function is called when the last reference to a device is
-	 * destroyed. It should free any resources allocated in the get_device_list
-	 * path.
-	 */
-	void (*destroy_device)(struct libusb_device *dev);
-
-	/* Submit a transfer. Your implementation should take the transfer,
-	 * morph it into whatever form your platform requires, and submit it
-	 * asynchronously.
-	 *
-	 * This function must not block.
-	 *
-	 * This function gets called with the flying_transfers_lock locked!
-	 *
-	 * Return:
-	 * - 0 on success
-	 * - LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
-	 * - another LIBUSB_ERROR code on other failure
-	 */
-	int (*submit_transfer)(struct usbi_transfer *itransfer);
-
-	/* Cancel a previously submitted transfer.
-	 *
-	 * This function must not block. The transfer cancellation must complete
-	 * later, resulting in a call to usbi_handle_transfer_cancellation()
-	 * from the context of handle_events.
-	 */
-	int (*cancel_transfer)(struct usbi_transfer *itransfer);
-
-	/* Clear a transfer as if it has completed or cancelled, but do not
-	 * report any completion/cancellation to the library. You should free
-	 * all private data from the transfer as if you were just about to report
-	 * completion or cancellation.
-	 *
-	 * This function might seem a bit out of place. It is used when libusbx
-	 * detects a disconnected device - it calls this function for all pending
-	 * transfers before reporting completion (with the disconnect code) to
-	 * the user. Maybe we can improve upon this internal interface in future.
-	 */
-	void (*clear_transfer_priv)(struct usbi_transfer *itransfer);
-
-	/* Handle any pending events. This involves monitoring any active
-	 * transfers and processing their completion or cancellation.
-	 *
-	 * The function is passed an array of pollfd structures (size nfds)
-	 * as a result of the poll() system call. The num_ready parameter
-	 * indicates the number of file descriptors that have reported events
-	 * (i.e. the poll() return value). This should be enough information
-	 * for you to determine which actions need to be taken on the currently
-	 * active transfers.
-	 *
-	 * For any cancelled transfers, call usbi_handle_transfer_cancellation().
-	 * For completed transfers, call usbi_handle_transfer_completion().
-	 * For control/bulk/interrupt transfers, populate the "transferred"
-	 * element of the appropriate usbi_transfer structure before calling the
-	 * above functions. For isochronous transfers, populate the status and
-	 * transferred fields of the iso packet descriptors of the transfer.
-	 *
-	 * This function should also be able to detect disconnection of the
-	 * device, reporting that situation with usbi_handle_disconnect().
-	 *
-	 * When processing an event related to a transfer, you probably want to
-	 * take usbi_transfer.lock to prevent races. See the documentation for
-	 * the usbi_transfer structure.
-	 *
-	 * Return 0 on success, or a LIBUSB_ERROR code on failure.
-	 */
-	int (*handle_events)(struct libusb_context *ctx,
-		struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready);
-
-	/* Get time from specified clock. At least two clocks must be implemented
-	   by the backend: USBI_CLOCK_REALTIME, and USBI_CLOCK_MONOTONIC.
-
-	   Description of clocks:
-	     USBI_CLOCK_REALTIME : clock returns time since system epoch.
-	     USBI_CLOCK_MONOTONIC: clock returns time since unspecified start
-	                             time (usually boot).
-	 */
-	int (*clock_gettime)(int clkid, struct timespec *tp);
-
-#ifdef USBI_TIMERFD_AVAILABLE
-	/* clock ID of the clock that should be used for timerfd */
-	clockid_t (*get_timerfd_clockid)(void);
-#endif
-
-	/* Number of bytes to reserve for per-device private backend data.
-	 * This private data area is accessible through the "os_priv" field of
-	 * struct libusb_device. */
-	size_t device_priv_size;
-
-	/* Number of bytes to reserve for per-handle private backend data.
-	 * This private data area is accessible through the "os_priv" field of
-	 * struct libusb_device. */
-	size_t device_handle_priv_size;
-
-	/* Number of bytes to reserve for per-transfer private backend data.
-	 * This private data area is accessible by calling
-	 * usbi_transfer_get_os_priv() on the appropriate usbi_transfer instance.
-	 */
-	size_t transfer_priv_size;
-
-	/* Mumber of additional bytes for os_priv for each iso packet.
-	 * Can your backend use this? */
-	/* FIXME: linux can't use this any more. if other OS's cannot either,
-	 * then remove this */
-	size_t add_iso_packet_size;
-};
-
-extern const struct usbi_os_backend * const usbi_backend;
-
-extern const struct usbi_os_backend linux_usbfs_backend;
-extern const struct usbi_os_backend darwin_backend;
-extern const struct usbi_os_backend openbsd_backend;
-extern const struct usbi_os_backend windows_backend;
-extern const struct usbi_os_backend wince_backend;
-
-extern struct list_head active_contexts_list;
-extern usbi_mutex_static_t active_contexts_lock;
-
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/darwin_usb.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/darwin_usb.c
deleted file mode 100644
index a24558cb59..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/darwin_usb.c
+++ /dev/null
@@ -1,1903 +0,0 @@
-/* -*- Mode: C; indent-tabs-mode:nil -*- */
-/*
- * darwin backend for libusbx 1.0
- * Copyright © 2008-2013 Nathan Hjelm <hjelmn@users.sourceforge.net>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-#include <ctype.h>
-#include <errno.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <libkern/OSAtomic.h>
-
-#include <mach/clock.h>
-#include <mach/clock_types.h>
-#include <mach/mach_host.h>
-#include <mach/mach_port.h>
-
-#include <AvailabilityMacros.h>
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
-  #include <objc/objc-auto.h>
-#endif
-
-#include "darwin_usb.h"
-
-/* async event thread */
-static pthread_mutex_t libusb_darwin_at_mutex = PTHREAD_MUTEX_INITIALIZER;
-static pthread_cond_t  libusb_darwin_at_cond = PTHREAD_COND_INITIALIZER;
-
-static clock_serv_t clock_realtime;
-static clock_serv_t clock_monotonic;
-
-static CFRunLoopRef libusb_darwin_acfl = NULL; /* event cf loop */
-static volatile int32_t initCount = 0;
-
-static usbi_mutex_t darwin_cached_devices_lock = PTHREAD_MUTEX_INITIALIZER;
-static struct list_head darwin_cached_devices = {&darwin_cached_devices, &darwin_cached_devices};
-
-#define DARWIN_CACHED_DEVICE(a) ((struct darwin_cached_device *) (((struct darwin_device_priv *)((a)->os_priv))->dev))
-
-/* async event thread */
-static pthread_t libusb_darwin_at;
-
-static int darwin_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian);
-static int darwin_claim_interface(struct libusb_device_handle *dev_handle, int iface);
-static int darwin_release_interface(struct libusb_device_handle *dev_handle, int iface);
-static int darwin_reset_device(struct libusb_device_handle *dev_handle);
-static void darwin_async_io_callback (void *refcon, IOReturn result, void *arg0);
-
-static int darwin_scan_devices(struct libusb_context *ctx);
-static int process_new_device (struct libusb_context *ctx, io_service_t service);
-
-#if defined(ENABLE_LOGGING)
-static const char *darwin_error_str (int result) {
-  switch (result) {
-  case kIOReturnSuccess:
-    return "no error";
-  case kIOReturnNotOpen:
-    return "device not opened for exclusive access";
-  case kIOReturnNoDevice:
-    return "no connection to an IOService";
-  case kIOUSBNoAsyncPortErr:
-    return "no async port has been opened for interface";
-  case kIOReturnExclusiveAccess:
-    return "another process has device opened for exclusive access";
-  case kIOUSBPipeStalled:
-    return "pipe is stalled";
-  case kIOReturnError:
-    return "could not establish a connection to the Darwin kernel";
-  case kIOUSBTransactionTimeout:
-    return "transaction timed out";
-  case kIOReturnBadArgument:
-    return "invalid argument";
-  case kIOReturnAborted:
-    return "transaction aborted";
-  case kIOReturnNotResponding:
-    return "device not responding";
-  case kIOReturnOverrun:
-    return "data overrun";
-  case kIOReturnCannotWire:
-    return "physical memory can not be wired down";
-  case kIOReturnNoResources:
-    return "out of resources";
-  case kIOUSBHighSpeedSplitError:
-    return "high speed split error";
-  default:
-    return "unknown error";
-  }
-}
-#endif
-
-static int darwin_to_libusb (int result) {
-  switch (result) {
-  case kIOReturnUnderrun:
-  case kIOReturnSuccess:
-    return LIBUSB_SUCCESS;
-  case kIOReturnNotOpen:
-  case kIOReturnNoDevice:
-    return LIBUSB_ERROR_NO_DEVICE;
-  case kIOReturnExclusiveAccess:
-    return LIBUSB_ERROR_ACCESS;
-  case kIOUSBPipeStalled:
-    return LIBUSB_ERROR_PIPE;
-  case kIOReturnBadArgument:
-    return LIBUSB_ERROR_INVALID_PARAM;
-  case kIOUSBTransactionTimeout:
-    return LIBUSB_ERROR_TIMEOUT;
-  case kIOReturnNotResponding:
-  case kIOReturnAborted:
-  case kIOReturnError:
-  case kIOUSBNoAsyncPortErr:
-  default:
-    return LIBUSB_ERROR_OTHER;
-  }
-}
-
-/* this function must be called with the darwin_cached_devices_lock held */
-static void darwin_deref_cached_device(struct darwin_cached_device *cached_dev) {
-  cached_dev->refcount--;
-  /* free the device and remove it from the cache */
-  if (0 == cached_dev->refcount) {
-    list_del(&cached_dev->list);
-
-    (*(cached_dev->device))->Release(cached_dev->device);
-    free (cached_dev);
-  }
-}
-
-static void darwin_ref_cached_device(struct darwin_cached_device *cached_dev) {
-  cached_dev->refcount++;
-}
-
-static int ep_to_pipeRef(struct libusb_device_handle *dev_handle, uint8_t ep, uint8_t *pipep, uint8_t *ifcp) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-
-  /* current interface */
-  struct darwin_interface *cInterface;
-
-  int8_t i, iface;
-
-  usbi_dbg ("converting ep address 0x%02x to pipeRef and interface", ep);
-
-  for (iface = 0 ; iface < USB_MAXINTERFACES ; iface++) {
-    cInterface = &priv->interfaces[iface];
-
-    if (dev_handle->claimed_interfaces & (1 << iface)) {
-      for (i = 0 ; i < cInterface->num_endpoints ; i++) {
-        if (cInterface->endpoint_addrs[i] == ep) {
-          *pipep = i + 1;
-          *ifcp = iface;
-          usbi_dbg ("pipe %d on interface %d matches", *pipep, *ifcp);
-          return 0;
-        }
-      }
-    }
-  }
-
-  /* No pipe found with the correct endpoint address */
-  usbi_warn (HANDLE_CTX(dev_handle), "no pipeRef found with endpoint address 0x%02x.", ep);
-
-  return -1;
-}
-
-static int usb_setup_device_iterator (io_iterator_t *deviceIterator, UInt32 location) {
-  CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName);
-
-  if (!matchingDict)
-    return kIOReturnError;
-
-  if (location) {
-    CFMutableDictionaryRef propertyMatchDict = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
-                                                                         &kCFTypeDictionaryKeyCallBacks,
-                                                                         &kCFTypeDictionaryValueCallBacks);
-
-    if (propertyMatchDict) {
-      /* there are no unsigned CFNumber types so treat the value as signed. the os seems to do this
-         internally (CFNumberType of locationID is 3) */
-      CFTypeRef locationCF = CFNumberCreate (NULL, kCFNumberSInt32Type, &location);
-
-      CFDictionarySetValue (propertyMatchDict, CFSTR(kUSBDevicePropertyLocationID), locationCF);
-      /* release our reference to the CFNumber (CFDictionarySetValue retains it) */
-      CFRelease (locationCF);
-
-      CFDictionarySetValue (matchingDict, CFSTR(kIOPropertyMatchKey), propertyMatchDict);
-      /* release out reference to the CFMutableDictionaryRef (CFDictionarySetValue retains it) */
-      CFRelease (propertyMatchDict);
-    }
-    /* else we can still proceed as long as the caller accounts for the possibility of other devices in the iterator */
-  }
-
-  return IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, deviceIterator);
-}
-
-static int get_ioregistry_value_number (io_service_t service, CFStringRef property, CFNumberType type, void *p) {
-  CFTypeRef cfNumber = IORegistryEntryCreateCFProperty (service, property, kCFAllocatorDefault, 0);
-  int ret = 0;
-
-  if (cfNumber) {
-    if (CFGetTypeID(cfNumber) == CFNumberGetTypeID()) {
-      ret = CFNumberGetValue(cfNumber, type, p);
-    }
-
-    CFRelease (cfNumber);
-  }
-
-  return ret;
-}
-
-static usb_device_t **darwin_device_from_service (io_service_t service)
-{
-  io_cf_plugin_ref_t *plugInInterface = NULL;
-  usb_device_t **device;
-  kern_return_t result;
-  SInt32 score;
-
-  result = IOCreatePlugInInterfaceForService(service, kIOUSBDeviceUserClientTypeID,
-                                             kIOCFPlugInInterfaceID, &plugInInterface,
-                                             &score);
-
-  if (kIOReturnSuccess != result || !plugInInterface) {
-    usbi_dbg ("could not set up plugin for service: %s\n", darwin_error_str (result));
-    return NULL;
-  }
-
-  (void)(*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(DeviceInterfaceID),
-                                           (LPVOID)&device);
-  /* Use release instead of IODestroyPlugInInterface to avoid stopping IOServices associated with this device */
-  (*plugInInterface)->Release (plugInInterface);
-
-  return device;
-}
-
-static void darwin_devices_attached (void *ptr, io_iterator_t add_devices) {
-  struct libusb_context *ctx;
-  io_service_t service;
-
-  usbi_mutex_lock(&active_contexts_lock);
-
-  while ((service = IOIteratorNext(add_devices))) {
-    /* add this device to each active context's device list */
-    list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
-      process_new_device (ctx, service);;
-    }
-
-    IOObjectRelease(service);
-  }
-
-  usbi_mutex_unlock(&active_contexts_lock);
-}
-
-static void darwin_devices_detached (void *ptr, io_iterator_t rem_devices) {
-  struct libusb_device *dev = NULL;
-  struct libusb_context *ctx;
-
-  io_service_t device;
-  UInt64 session;
-  int ret;
-
-  while ((device = IOIteratorNext (rem_devices)) != 0) {
-    /* get the location from the i/o registry */
-    ret = get_ioregistry_value_number (device, CFSTR("sessionID"), kCFNumberSInt64Type, &session);
-    IOObjectRelease (device);
-    if (!ret)
-      continue;
-
-    usbi_mutex_lock(&active_contexts_lock);
-
-    list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
-      usbi_dbg ("notifying context %p of device disconnect", ctx);
-
-      dev = usbi_get_device_by_session_id(ctx, session);
-      if (dev) {
-        /* signal the core that this device has been disconnected. the core will tear down this device
-           when the reference count reaches 0 */
-        usbi_disconnect_device(dev);
-      }
-    }
-
-    usbi_mutex_unlock(&active_contexts_lock);
-  }
-}
-
-static void darwin_clear_iterator (io_iterator_t iter) {
-  io_service_t device;
-
-  while ((device = IOIteratorNext (iter)) != 0)
-    IOObjectRelease (device);
-}
-
-static void *darwin_event_thread_main (void *arg0) {
-  IOReturn kresult;
-  struct libusb_context *ctx = (struct libusb_context *)arg0;
-  CFRunLoopRef runloop;
-
-  /* Set this thread's name, so it can be seen in the debugger
-     and crash reports. */
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
-  pthread_setname_np ("org.libusb.device-hotplug");
-
-  /* Tell the Objective-C garbage collector about this thread.
-     This is required because, unlike NSThreads, pthreads are
-     not automatically registered. Although we don't use
-     Objective-C, we use CoreFoundation, which does. */
-  objc_registerThreadWithCollector();
-#endif
-
-  /* hotplug (device arrival/removal) sources */
-  CFRunLoopSourceRef     libusb_notification_cfsource;
-  io_notification_port_t libusb_notification_port;
-  io_iterator_t          libusb_rem_device_iterator;
-  io_iterator_t          libusb_add_device_iterator;
-
-  usbi_dbg ("creating hotplug event source");
-
-  runloop = CFRunLoopGetCurrent ();
-  CFRetain (runloop);
-
-  /* add the notification port to the run loop */
-  libusb_notification_port     = IONotificationPortCreate (kIOMasterPortDefault);
-  libusb_notification_cfsource = IONotificationPortGetRunLoopSource (libusb_notification_port);
-  CFRunLoopAddSource(runloop, libusb_notification_cfsource, kCFRunLoopDefaultMode);
-
-  /* create notifications for removed devices */
-  kresult = IOServiceAddMatchingNotification (libusb_notification_port, kIOTerminatedNotification,
-                                              IOServiceMatching(kIOUSBDeviceClassName),
-                                              (IOServiceMatchingCallback)darwin_devices_detached,
-                                              (void *)ctx, &libusb_rem_device_iterator);
-
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (ctx, "could not add hotplug event source: %s", darwin_error_str (kresult));
-
-    pthread_exit (NULL);
-  }
-
-  /* create notifications for attached devices */
-  kresult = IOServiceAddMatchingNotification(libusb_notification_port, kIOFirstMatchNotification,
-                                              IOServiceMatching(kIOUSBDeviceClassName),
-                                              (IOServiceMatchingCallback)darwin_devices_attached,
-                                              (void *)ctx, &libusb_add_device_iterator);
-
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (ctx, "could not add hotplug event source: %s", darwin_error_str (kresult));
-
-    pthread_exit (NULL);
-  }
-
-  /* arm notifiers */
-  darwin_clear_iterator (libusb_rem_device_iterator);
-  darwin_clear_iterator (libusb_add_device_iterator);
-
-  usbi_dbg ("darwin event thread ready to receive events");
-
-  /* signal the main thread that the hotplug runloop has been created. */
-  pthread_mutex_lock (&libusb_darwin_at_mutex);
-  libusb_darwin_acfl = runloop;
-  pthread_cond_signal (&libusb_darwin_at_cond);
-  pthread_mutex_unlock (&libusb_darwin_at_mutex);
-
-  /* run the runloop */
-  CFRunLoopRun();
-
-  usbi_dbg ("darwin event thread exiting");
-
-  /* remove the notification cfsource */
-  CFRunLoopRemoveSource(runloop, libusb_notification_cfsource, kCFRunLoopDefaultMode);
-
-  /* delete notification port */
-  IONotificationPortDestroy (libusb_notification_port);
-
-  /* delete iterators */
-  IOObjectRelease (libusb_rem_device_iterator);
-  IOObjectRelease (libusb_add_device_iterator);
-
-  CFRelease (runloop);
-
-  libusb_darwin_acfl = NULL;
-
-  pthread_exit (NULL);
-}
-
-static void _darwin_finalize(void) {
-  struct darwin_cached_device *dev, *next;
-
-  usbi_mutex_lock(&darwin_cached_devices_lock);
-  list_for_each_entry_safe(dev, next, &darwin_cached_devices, list, struct darwin_cached_device) {
-    darwin_deref_cached_device(dev);
-  }
-  usbi_mutex_unlock(&darwin_cached_devices_lock);
-}
-
-static int darwin_init(struct libusb_context *ctx) {
-  host_name_port_t host_self;
-  static int initted = 0;
-  int rc;
-
-  rc = darwin_scan_devices (ctx);
-  if (LIBUSB_SUCCESS != rc) {
-    return rc;
-  }
-
-  if (OSAtomicIncrement32Barrier(&initCount) == 1) {
-    /* create the clocks that will be used */
-
-    if (!initted) {
-      initted = 1;
-      atexit(_darwin_finalize);
-    }
-
-    host_self = mach_host_self();
-    host_get_clock_service(host_self, CALENDAR_CLOCK, &clock_realtime);
-    host_get_clock_service(host_self, SYSTEM_CLOCK, &clock_monotonic);
-    mach_port_deallocate(mach_task_self(), host_self);
-
-    pthread_create (&libusb_darwin_at, NULL, darwin_event_thread_main, (void *)ctx);
-
-    pthread_mutex_lock (&libusb_darwin_at_mutex);
-    while (!libusb_darwin_acfl)
-      pthread_cond_wait (&libusb_darwin_at_cond, &libusb_darwin_at_mutex);
-    pthread_mutex_unlock (&libusb_darwin_at_mutex);
-  }
-
-  return rc;
-}
-
-static void darwin_exit (void) {
-  if (OSAtomicDecrement32Barrier(&initCount) == 0) {
-    mach_port_deallocate(mach_task_self(), clock_realtime);
-    mach_port_deallocate(mach_task_self(), clock_monotonic);
-
-    /* stop the event runloop and wait for the thread to terminate. */
-    CFRunLoopStop (libusb_darwin_acfl);
-    pthread_join (libusb_darwin_at, NULL);
-  }
-}
-
-static int darwin_get_device_descriptor(struct libusb_device *dev, unsigned char *buffer, int *host_endian) {
-  struct darwin_cached_device *priv = DARWIN_CACHED_DEVICE(dev);
-
-  /* return cached copy */
-  memmove (buffer, &(priv->dev_descriptor), DEVICE_DESC_LENGTH);
-
-  *host_endian = 0;
-
-  return 0;
-}
-
-static int get_configuration_index (struct libusb_device *dev, int config_value) {
-  struct darwin_cached_device *priv = DARWIN_CACHED_DEVICE(dev);
-  UInt8 i, numConfig;
-  IOUSBConfigurationDescriptorPtr desc;
-  IOReturn kresult;
-
-  /* is there a simpler way to determine the index? */
-  kresult = (*(priv->device))->GetNumberOfConfigurations (priv->device, &numConfig);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  for (i = 0 ; i < numConfig ; i++) {
-    (*(priv->device))->GetConfigurationDescriptorPtr (priv->device, i, &desc);
-
-    if (desc->bConfigurationValue == config_value)
-      return i;
-  }
-
-  /* configuration not found */
-  return LIBUSB_ERROR_NOT_FOUND;
-}
-
-static int darwin_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len, int *host_endian) {
-  struct darwin_cached_device *priv = DARWIN_CACHED_DEVICE(dev);
-  int config_index;
-
-  if (0 == priv->active_config)
-    return LIBUSB_ERROR_NOT_FOUND;
-
-  config_index = get_configuration_index (dev, priv->active_config);
-  if (config_index < 0)
-    return config_index;
-
-  return darwin_get_config_descriptor (dev, config_index, buffer, len, host_endian);
-}
-
-static int darwin_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian) {
-  struct darwin_cached_device *priv = DARWIN_CACHED_DEVICE(dev);
-  IOUSBConfigurationDescriptorPtr desc;
-  IOReturn kresult;
-  int ret;
-
-  if (!priv || !priv->device)
-    return LIBUSB_ERROR_OTHER;
-
-  kresult = (*priv->device)->GetConfigurationDescriptorPtr (priv->device, config_index, &desc);
-  if (kresult == kIOReturnSuccess) {
-    /* copy descriptor */
-    if (libusb_le16_to_cpu(desc->wTotalLength) < len)
-      len = libusb_le16_to_cpu(desc->wTotalLength);
-
-    memmove (buffer, desc, len);
-
-    /* GetConfigurationDescriptorPtr returns the descriptor in USB bus order */
-    *host_endian = 0;
-  }
-
-  ret = darwin_to_libusb (kresult);
-  if (ret != LIBUSB_SUCCESS)
-    return ret;
-
-  return len;
-}
-
-/* check whether the os has configured the device */
-static int darwin_check_configuration (struct libusb_context *ctx, struct darwin_cached_device *dev) {
-  usb_device_t **darwin_device = dev->device;
-
-  IOUSBConfigurationDescriptorPtr configDesc;
-  IOUSBFindInterfaceRequest request;
-  kern_return_t             kresult;
-  io_iterator_t             interface_iterator;
-  io_service_t              firstInterface;
-
-  if (dev->dev_descriptor.bNumConfigurations < 1) {
-    usbi_err (ctx, "device has no configurations");
-    return LIBUSB_ERROR_OTHER; /* no configurations at this speed so we can't use it */
-  }
-
-  /* find the first configuration */
-  kresult = (*darwin_device)->GetConfigurationDescriptorPtr (darwin_device, 0, &configDesc);
-  dev->first_config = (kIOReturnSuccess == kresult) ? configDesc->bConfigurationValue : 1;
-
-  /* check if the device is already configured. there is probably a better way than iterating over the
-     to accomplish this (the trick is we need to avoid a call to GetConfigurations since buggy devices
-     might lock up on the device request) */
-
-  /* Setup the Interface Request */
-  request.bInterfaceClass    = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
-  request.bAlternateSetting  = kIOUSBFindInterfaceDontCare;
-
-  kresult = (*(darwin_device))->CreateInterfaceIterator(darwin_device, &request, &interface_iterator);
-  if (kresult)
-    return darwin_to_libusb (kresult);
-
-  /* iterate once */
-  firstInterface = IOIteratorNext(interface_iterator);
-
-  /* done with the interface iterator */
-  IOObjectRelease(interface_iterator);
-
-  if (firstInterface) {
-    IOObjectRelease (firstInterface);
-
-    /* device is configured */
-    if (dev->dev_descriptor.bNumConfigurations == 1)
-      /* to avoid problems with some devices get the configurations value from the configuration descriptor */
-      dev->active_config = dev->first_config;
-    else
-      /* devices with more than one configuration should work with GetConfiguration */
-      (*darwin_device)->GetConfiguration (darwin_device, &dev->active_config);
-  } else
-    /* not configured */
-    dev->active_config = 0;
-  
-  usbi_dbg ("active config: %u, first config: %u", dev->active_config, dev->first_config);
-
-  return 0;
-}
-
-static int darwin_request_descriptor (usb_device_t **device, UInt8 desc, UInt8 desc_index, void *buffer, size_t buffer_size) {
-  IOUSBDevRequestTO req;
-
-  memset (buffer, 0, buffer_size);
-
-  /* Set up request for descriptor/ */
-  req.bmRequestType = USBmakebmRequestType(kUSBIn, kUSBStandard, kUSBDevice);
-  req.bRequest      = kUSBRqGetDescriptor;
-  req.wValue        = desc << 8;
-  req.wIndex        = desc_index;
-  req.wLength       = buffer_size;
-  req.pData         = buffer;
-  req.noDataTimeout = 20;
-  req.completionTimeout = 100;
-
-  return (*device)->DeviceRequestTO (device, &req);
-}
-
-static int darwin_cache_device_descriptor (struct libusb_context *ctx, struct darwin_cached_device *dev) {
-  usb_device_t **device = dev->device;
-  int retries = 1, delay = 30000;
-  int unsuspended = 0, try_unsuspend = 1, try_reconfigure = 1;
-  int is_open = 0;
-  int ret = 0, ret2;
-  UInt8 bDeviceClass;
-  UInt16 idProduct, idVendor;
-
-  dev->can_enumerate = 0;
-
-  (*device)->GetDeviceClass (device, &bDeviceClass);
-  (*device)->GetDeviceProduct (device, &idProduct);
-  (*device)->GetDeviceVendor (device, &idVendor);
-
-  /* According to Apple's documentation the device must be open for DeviceRequest but we may not be able to open some
-   * devices and Apple's USB Prober doesn't bother to open the device before issuing a descriptor request.  Still,
-   * to follow the spec as closely as possible, try opening the device */
-  is_open = ((*device)->USBDeviceOpenSeize(device) == kIOReturnSuccess);
-
-  do {
-    /**** retrieve device descriptor ****/
-    ret = darwin_request_descriptor (device, kUSBDeviceDesc, 0, &dev->dev_descriptor, sizeof(dev->dev_descriptor));
-
-    if (kIOReturnOverrun == ret && kUSBDeviceDesc == dev->dev_descriptor.bDescriptorType)
-      /* received an overrun error but we still received a device descriptor */
-      ret = kIOReturnSuccess;
-
-    if (kIOUSBVendorIDAppleComputer == idVendor) {
-      /* NTH: don't bother retrying or unsuspending Apple devices */
-      break;
-    }
-
-    if (kIOReturnSuccess == ret && (0 == dev->dev_descriptor.bNumConfigurations ||
-                                    0 == dev->dev_descriptor.bcdUSB)) {
-      /* work around for incorrectly configured devices */
-      if (try_reconfigure && is_open) {
-        usbi_dbg("descriptor appears to be invalid. resetting configuration before trying again...");
-
-        /* set the first configuration */
-        (*device)->SetConfiguration(device, 1);
-
-        /* don't try to reconfigure again */
-        try_reconfigure = 0;
-      }
-
-      ret = kIOUSBPipeStalled;
-    }
-
-    if (kIOReturnSuccess != ret && is_open && try_unsuspend) {
-      /* device may be suspended. unsuspend it and try again */
-#if DeviceVersion >= 320
-      UInt32 info = 0;
-
-      /* IOUSBFamily 320+ provides a way to detect device suspension but earlier versions do not */
-      (void)(*device)->GetUSBDeviceInformation (device, &info);
-
-      /* note that the device was suspended */
-      if (info & (1 << kUSBInformationDeviceIsSuspendedBit) || 0 == info)
-        try_unsuspend = 1;
-#endif
-
-      if (try_unsuspend) {
-        /* try to unsuspend the device */
-        ret2 = (*device)->USBDeviceSuspend (device, 0);
-        if (kIOReturnSuccess != ret2) {
-          /* prevent log spew from poorly behaving devices.  this indicates the
-             os actually had trouble communicating with the device */
-          usbi_dbg("could not retrieve device descriptor. failed to unsuspend: %s",darwin_error_str(ret2));
-        } else
-          unsuspended = 1;
-
-        try_unsuspend = 0;
-      }
-    }
-
-    if (kIOReturnSuccess != ret) {
-      usbi_dbg("kernel responded with code: 0x%08x. sleeping for %d ms before trying again", ret, delay/1000);
-      /* sleep for a little while before trying again */
-      usleep (delay);
-    }
-  } while (kIOReturnSuccess != ret && retries--);
-
-  if (unsuspended)
-    /* resuspend the device */
-    (void)(*device)->USBDeviceSuspend (device, 1);
-
-  if (is_open)
-    (void) (*device)->USBDeviceClose (device);
-
-  if (ret != kIOReturnSuccess) {
-    /* a debug message was already printed out for this error */
-    if (LIBUSB_CLASS_HUB == bDeviceClass)
-      usbi_dbg ("could not retrieve device descriptor %.4x:%.4x: %s (%x). skipping device",
-                idVendor, idProduct, darwin_error_str (ret), ret);
-    else
-      usbi_warn (ctx, "could not retrieve device descriptor %.4x:%.4x: %s (%x). skipping device",
-                 idVendor, idProduct, darwin_error_str (ret), ret);
-    return -1;
-  }
-
-  /* catch buggy hubs (which appear to be virtual). Apple's own USB prober has problems with these devices. */
-  if (libusb_le16_to_cpu (dev->dev_descriptor.idProduct) != idProduct) {
-    /* not a valid device */
-    usbi_warn (ctx, "idProduct from iokit (%04x) does not match idProduct in descriptor (%04x). skipping device",
-               idProduct, libusb_le16_to_cpu (dev->dev_descriptor.idProduct));
-    return -1;
-  }
-
-  usbi_dbg ("cached device descriptor:");
-  usbi_dbg ("  bDescriptorType:    0x%02x", dev->dev_descriptor.bDescriptorType);
-  usbi_dbg ("  bcdUSB:             0x%04x", dev->dev_descriptor.bcdUSB);
-  usbi_dbg ("  bDeviceClass:       0x%02x", dev->dev_descriptor.bDeviceClass);
-  usbi_dbg ("  bDeviceSubClass:    0x%02x", dev->dev_descriptor.bDeviceSubClass);
-  usbi_dbg ("  bDeviceProtocol:    0x%02x", dev->dev_descriptor.bDeviceProtocol);
-  usbi_dbg ("  bMaxPacketSize0:    0x%02x", dev->dev_descriptor.bMaxPacketSize0);
-  usbi_dbg ("  idVendor:           0x%04x", dev->dev_descriptor.idVendor);
-  usbi_dbg ("  idProduct:          0x%04x", dev->dev_descriptor.idProduct);
-  usbi_dbg ("  bcdDevice:          0x%04x", dev->dev_descriptor.bcdDevice);
-  usbi_dbg ("  iManufacturer:      0x%02x", dev->dev_descriptor.iManufacturer);
-  usbi_dbg ("  iProduct:           0x%02x", dev->dev_descriptor.iProduct);
-  usbi_dbg ("  iSerialNumber:      0x%02x", dev->dev_descriptor.iSerialNumber);
-  usbi_dbg ("  bNumConfigurations: 0x%02x", dev->dev_descriptor.bNumConfigurations);
-
-  dev->can_enumerate = 1;
-
-  return 0;
-}
-
-static int darwin_get_cached_device(struct libusb_context *ctx, io_service_t service,
-                                    struct darwin_cached_device **cached_out) {
-  struct darwin_cached_device *new_device;
-  UInt64 sessionID, parent_sessionID;
-  int ret = LIBUSB_SUCCESS;
-  usb_device_t **device;
-  io_service_t parent;
-  kern_return_t result;
-  UInt8 port = 0;
-
-  *cached_out = NULL;
-
-  /* get some info from the io registry */
-  (void) get_ioregistry_value_number (service, CFSTR("sessionID"), kCFNumberSInt64Type, &sessionID);
-  (void) get_ioregistry_value_number (service, CFSTR("PortNum"), kCFNumberSInt8Type, &port);
-
-  usbi_dbg("finding cached device for sessionID 0x\n" PRIx64, sessionID);
-
-  result = IORegistryEntryGetParentEntry (service, kIOUSBPlane, &parent);
-
-  if (kIOReturnSuccess == result) {
-    (void) get_ioregistry_value_number (parent, CFSTR("sessionID"), kCFNumberSInt64Type, &parent_sessionID);
-    IOObjectRelease(parent);
-  }
-
-  usbi_mutex_lock(&darwin_cached_devices_lock);
-  do {
-    list_for_each_entry(new_device, &darwin_cached_devices, list, struct darwin_cached_device) {
-      usbi_dbg("matching sessionID 0x%x against cached device with sessionID 0x%x", sessionID, new_device->session);
-      if (new_device->session == sessionID) {
-        usbi_dbg("using cached device for device");
-        *cached_out = new_device;
-        break;
-      }
-    }
-
-    if (*cached_out)
-      break;
-
-    usbi_dbg("caching new device with sessionID 0x%x\n", sessionID);
-
-    new_device = calloc (1, sizeof (*new_device));
-    if (!new_device) {
-      ret = LIBUSB_ERROR_NO_MEM;
-      break;
-    }
-
-    device = darwin_device_from_service (service);
-    if (!device) {
-      ret = LIBUSB_ERROR_NO_DEVICE;
-      free (new_device);
-      new_device = NULL;
-      break;
-    }
-
-    /* add this device to the cached device list */
-    list_add(&new_device->list, &darwin_cached_devices);
-
-    (*device)->GetDeviceAddress (device, (USBDeviceAddress *)&new_device->address);
-
-    /* keep a reference to this device */
-    darwin_ref_cached_device(new_device);
-
-    new_device->device = device;
-    new_device->session = sessionID;
-    (*device)->GetLocationID (device, &new_device->location);
-    new_device->port = port;
-    new_device->parent_session = parent_sessionID;
-
-    /* cache the device descriptor */
-    ret = darwin_cache_device_descriptor(ctx, new_device);
-    if (ret)
-      break;
-
-    if (new_device->can_enumerate) {
-      snprintf(new_device->sys_path, 20, "%03i-%04x-%04x-%02x-%02x", new_device->address,
-               new_device->dev_descriptor.idVendor, new_device->dev_descriptor.idProduct,
-               new_device->dev_descriptor.bDeviceClass, new_device->dev_descriptor.bDeviceSubClass);
-    }
-  } while (0);
-
-  usbi_mutex_unlock(&darwin_cached_devices_lock);
-
-  /* keep track of devices regardless of if we successfully enumerate them to
-     prevent them from being enumerated multiple times */
-
-  *cached_out = new_device;
-
-  return ret;
-}
-
-static int process_new_device (struct libusb_context *ctx, io_service_t service) {
-  struct darwin_device_priv *priv;
-  struct libusb_device *dev = NULL;
-  struct darwin_cached_device *cached_device;
-  UInt8 devSpeed;
-  int ret = 0;
-
-  do {
-    ret = darwin_get_cached_device (ctx, service, &cached_device);
-
-    if (ret < 0 || (cached_device && !cached_device->can_enumerate)) {
-      return ret;
-    }
-
-    /* check current active configuration (and cache the first configuration value--
-       which may be used by claim_interface) */
-    ret = darwin_check_configuration (ctx, cached_device);
-    if (ret)
-      break;
-
-    usbi_dbg ("allocating new device in context %p for with session 0x%08x",
-              ctx, cached_device->session);
-
-    dev = usbi_alloc_device(ctx, cached_device->session);
-    if (!dev) {
-      return LIBUSB_ERROR_NO_MEM;
-    }
-
-    priv = (struct darwin_device_priv *)dev->os_priv;
-
-    priv->dev = cached_device;
-    darwin_ref_cached_device (priv->dev);
-
-    if (cached_device->parent_session > 0) {
-      dev->parent_dev = usbi_get_device_by_session_id (ctx, cached_device->parent_session);
-    } else {
-      dev->parent_dev = NULL;
-    }
-    dev->port_number    = cached_device->port;
-    dev->bus_number     = cached_device->location >> 24;
-    dev->device_address = cached_device->address;
-
-    /* need to add a reference to the parent device */
-    if (dev->parent_dev) {
-      libusb_ref_device(dev->parent_dev);
-    }
-
-    (*(priv->dev->device))->GetDeviceSpeed (priv->dev->device, &devSpeed);
-
-    switch (devSpeed) {
-    case kUSBDeviceSpeedLow: dev->speed = LIBUSB_SPEED_LOW; break;
-    case kUSBDeviceSpeedFull: dev->speed = LIBUSB_SPEED_FULL; break;
-    case kUSBDeviceSpeedHigh: dev->speed = LIBUSB_SPEED_HIGH; break;
-#if DeviceVersion >= 500
-    case kUSBDeviceSpeedSuper: dev->speed = LIBUSB_SPEED_SUPER; break;
-#endif
-    default:
-      usbi_warn (ctx, "Got unknown device speed %d", devSpeed);
-    }
-
-    ret = usbi_sanitize_device (dev);
-    if (ret < 0)
-      break;
-
-    usbi_dbg ("found device with address %d port = %d parent = %p at %p", dev->device_address,
-              dev->port_number, (void *) dev->parent_dev, priv->dev->sys_path);
-  } while (0);
-
-  if (0 == ret) {
-    usbi_connect_device (dev);
-  } else {
-    libusb_unref_device (dev);
-  }
-
-  return ret;
-}
-
-static int darwin_scan_devices(struct libusb_context *ctx) {
-  io_iterator_t deviceIterator;
-  io_service_t service;
-  kern_return_t kresult;
-
-  kresult = usb_setup_device_iterator (&deviceIterator, 0);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  while ((service = IOIteratorNext (deviceIterator))) {
-    (void) process_new_device (ctx, service);
-
-    IOObjectRelease(service);
-  }
-
-  IOObjectRelease(deviceIterator);
-
-  return 0;
-}
-
-static int darwin_open (struct libusb_device_handle *dev_handle) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-  IOReturn kresult;
-
-  if (0 == dpriv->open_count) {
-    /* try to open the device */
-    kresult = (*(dpriv->device))->USBDeviceOpenSeize (dpriv->device);
-    if (kresult != kIOReturnSuccess) {
-      usbi_warn (HANDLE_CTX (dev_handle), "USBDeviceOpen: %s", darwin_error_str(kresult));
-
-      if (kIOReturnExclusiveAccess != kresult) {
-        return darwin_to_libusb (kresult);
-      }
-
-      /* it is possible to perform some actions on a device that is not open so do not return an error */
-      priv->is_open = 0;
-    } else {
-      priv->is_open = 1;
-    }
-
-    /* create async event source */
-    kresult = (*(dpriv->device))->CreateDeviceAsyncEventSource (dpriv->device, &priv->cfSource);
-    if (kresult != kIOReturnSuccess) {
-      usbi_err (HANDLE_CTX (dev_handle), "CreateDeviceAsyncEventSource: %s", darwin_error_str(kresult));
-
-      if (priv->is_open) {
-        (*(dpriv->device))->USBDeviceClose (dpriv->device);
-      }
-
-      priv->is_open = 0;
-
-      return darwin_to_libusb (kresult);
-    }
-
-    CFRetain (libusb_darwin_acfl);
-
-    /* add the cfSource to the aync run loop */
-    CFRunLoopAddSource(libusb_darwin_acfl, priv->cfSource, kCFRunLoopCommonModes);
-  }
-
-  /* device opened successfully */
-  dpriv->open_count++;
-
-  /* create a file descriptor for notifications */
-  pipe (priv->fds);
-
-  /* set the pipe to be non-blocking */
-  fcntl (priv->fds[1], F_SETFD, O_NONBLOCK);
-
-  usbi_add_pollfd(HANDLE_CTX(dev_handle), priv->fds[0], POLLIN);
-
-  usbi_dbg ("device open for access");
-
-  return 0;
-}
-
-static void darwin_close (struct libusb_device_handle *dev_handle) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-  IOReturn kresult;
-  int i;
-
-  if (dpriv->open_count == 0) {
-    /* something is probably very wrong if this is the case */
-    usbi_err (HANDLE_CTX (dev_handle), "Close called on a device that was not open!\n");
-    return;
-  }
-
-  dpriv->open_count--;
-
-  /* make sure all interfaces are released */
-  for (i = 0 ; i < USB_MAXINTERFACES ; i++)
-    if (dev_handle->claimed_interfaces & (1 << i))
-      libusb_release_interface (dev_handle, i);
-
-  if (0 == dpriv->open_count) {
-    /* delete the device's async event source */
-    if (priv->cfSource) {
-      CFRunLoopRemoveSource (libusb_darwin_acfl, priv->cfSource, kCFRunLoopDefaultMode);
-      CFRelease (priv->cfSource);
-      priv->cfSource = NULL;
-      CFRelease (libusb_darwin_acfl);
-    }
-
-    if (priv->is_open) {
-      /* close the device */
-      kresult = (*(dpriv->device))->USBDeviceClose(dpriv->device);
-      if (kresult) {
-        /* Log the fact that we had a problem closing the file, however failing a
-         * close isn't really an error, so return success anyway */
-        usbi_warn (HANDLE_CTX (dev_handle), "USBDeviceClose: %s", darwin_error_str(kresult));
-      }
-    }
-  }
-
-  /* file descriptors are maintained per-instance */
-  usbi_remove_pollfd (HANDLE_CTX (dev_handle), priv->fds[0]);
-  close (priv->fds[1]);
-  close (priv->fds[0]);
-
-  priv->fds[0] = priv->fds[1] = -1;
-}
-
-static int darwin_get_configuration(struct libusb_device_handle *dev_handle, int *config) {
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-
-  *config = (int) dpriv->active_config;
-
-  return 0;
-}
-
-static int darwin_set_configuration(struct libusb_device_handle *dev_handle, int config) {
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-  IOReturn kresult;
-  int i;
-
-  /* Setting configuration will invalidate the interface, so we need
-     to reclaim it. First, dispose of existing interfaces, if any. */
-  for (i = 0 ; i < USB_MAXINTERFACES ; i++)
-    if (dev_handle->claimed_interfaces & (1 << i))
-      darwin_release_interface (dev_handle, i);
-
-  kresult = (*(dpriv->device))->SetConfiguration (dpriv->device, config);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  /* Reclaim any interfaces. */
-  for (i = 0 ; i < USB_MAXINTERFACES ; i++)
-    if (dev_handle->claimed_interfaces & (1 << i))
-      darwin_claim_interface (dev_handle, i);
-
-  dpriv->active_config = config;
-
-  return 0;
-}
-
-static int darwin_get_interface (usb_device_t **darwin_device, uint8_t ifc, io_service_t *usbInterfacep) {
-  IOUSBFindInterfaceRequest request;
-  kern_return_t             kresult;
-  io_iterator_t             interface_iterator;
-  UInt8                     bInterfaceNumber;
-  int                       ret;
-
-  *usbInterfacep = IO_OBJECT_NULL;
-
-  /* Setup the Interface Request */
-  request.bInterfaceClass    = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
-  request.bAlternateSetting  = kIOUSBFindInterfaceDontCare;
-
-  kresult = (*(darwin_device))->CreateInterfaceIterator(darwin_device, &request, &interface_iterator);
-  if (kresult)
-    return kresult;
-
-  while ((*usbInterfacep = IOIteratorNext(interface_iterator))) {
-    /* find the interface number */
-    ret = get_ioregistry_value_number (*usbInterfacep, CFSTR("bInterfaceNumber"), kCFNumberSInt8Type,
-                                       &bInterfaceNumber);
-
-    if (ret && bInterfaceNumber == ifc) {
-      break;
-    }
-
-    (void) IOObjectRelease (*usbInterfacep);
-  }
-
-  /* done with the interface iterator */
-  IOObjectRelease(interface_iterator);
-
-  return 0;
-}
-
-static int get_endpoints (struct libusb_device_handle *dev_handle, int iface) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-
-  /* current interface */
-  struct darwin_interface *cInterface = &priv->interfaces[iface];
-
-  kern_return_t kresult;
-
-  u_int8_t numep, direction, number;
-  u_int8_t dont_care1, dont_care3;
-  u_int16_t dont_care2;
-  int i;
-
-  usbi_dbg ("building table of endpoints.");
-
-  /* retrieve the total number of endpoints on this interface */
-  kresult = (*(cInterface->interface))->GetNumEndpoints(cInterface->interface, &numep);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "can't get number of endpoints for interface: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  /* iterate through pipe references */
-  for (i = 1 ; i <= numep ; i++) {
-    kresult = (*(cInterface->interface))->GetPipeProperties(cInterface->interface, i, &direction, &number, &dont_care1,
-                                                            &dont_care2, &dont_care3);
-
-    if (kresult != kIOReturnSuccess) {
-      usbi_err (HANDLE_CTX (dev_handle), "error getting pipe information for pipe %d: %s", i, darwin_error_str(kresult));
-
-      return darwin_to_libusb (kresult);
-    }
-
-    usbi_dbg ("interface: %i pipe %i: dir: %i number: %i", iface, i, direction, number);
-
-    cInterface->endpoint_addrs[i - 1] = ((direction << 7 & LIBUSB_ENDPOINT_DIR_MASK) | (number & LIBUSB_ENDPOINT_ADDRESS_MASK));
-  }
-
-  cInterface->num_endpoints = numep;
-
-  return 0;
-}
-
-static int darwin_claim_interface(struct libusb_device_handle *dev_handle, int iface) {
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  io_service_t          usbInterface = IO_OBJECT_NULL;
-  IOReturn kresult;
-  IOCFPlugInInterface **plugInInterface = NULL;
-  SInt32                score;
-
-  /* current interface */
-  struct darwin_interface *cInterface = &priv->interfaces[iface];
-
-  kresult = darwin_get_interface (dpriv->device, iface, &usbInterface);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  /* make sure we have an interface */
-  if (!usbInterface && dpriv->first_config != 0) {
-    usbi_info (HANDLE_CTX (dev_handle), "no interface found; setting configuration: %d", dpriv->first_config);
-
-    /* set the configuration */
-    kresult = darwin_set_configuration (dev_handle, dpriv->first_config);
-    if (kresult != LIBUSB_SUCCESS) {
-      usbi_err (HANDLE_CTX (dev_handle), "could not set configuration");
-      return kresult;
-    }
-
-    kresult = darwin_get_interface (dpriv->device, iface, &usbInterface);
-    if (kresult) {
-      usbi_err (HANDLE_CTX (dev_handle), "darwin_get_interface: %s", darwin_error_str(kresult));
-      return darwin_to_libusb (kresult);
-    }
-  }
-
-  if (!usbInterface) {
-    usbi_err (HANDLE_CTX (dev_handle), "interface not found");
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  /* get an interface to the device's interface */
-  kresult = IOCreatePlugInInterfaceForService (usbInterface, kIOUSBInterfaceUserClientTypeID,
-                                               kIOCFPlugInInterfaceID, &plugInInterface, &score);
-
-  /* ignore release error */
-  (void)IOObjectRelease (usbInterface);
-
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "IOCreatePlugInInterfaceForService: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  if (!plugInInterface) {
-    usbi_err (HANDLE_CTX (dev_handle), "plugin interface not found");
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  /* Do the actual claim */
-  kresult = (*plugInInterface)->QueryInterface(plugInInterface,
-                                               CFUUIDGetUUIDBytes(kIOUSBInterfaceInterfaceID),
-                                               (LPVOID)&cInterface->interface);
-  /* We no longer need the intermediate plug-in */
-  /* Use release instead of IODestroyPlugInInterface to avoid stopping IOServices associated with this device */
-  (*plugInInterface)->Release (plugInInterface);
-  if (kresult || !cInterface->interface) {
-    usbi_err (HANDLE_CTX (dev_handle), "QueryInterface: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  /* claim the interface */
-  kresult = (*(cInterface->interface))->USBInterfaceOpen(cInterface->interface);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "USBInterfaceOpen: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  /* update list of endpoints */
-  kresult = get_endpoints (dev_handle, iface);
-  if (kresult) {
-    /* this should not happen */
-    darwin_release_interface (dev_handle, iface);
-    usbi_err (HANDLE_CTX (dev_handle), "could not build endpoint table");
-    return kresult;
-  }
-
-  cInterface->cfSource = NULL;
-
-  /* create async event source */
-  kresult = (*(cInterface->interface))->CreateInterfaceAsyncEventSource (cInterface->interface, &cInterface->cfSource);
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (HANDLE_CTX (dev_handle), "could not create async event source");
-
-    /* can't continue without an async event source */
-    (void)darwin_release_interface (dev_handle, iface);
-
-    return darwin_to_libusb (kresult);
-  }
-
-  /* add the cfSource to the async thread's run loop */
-  CFRunLoopAddSource(libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
-
-  usbi_dbg ("interface opened");
-
-  return 0;
-}
-
-static int darwin_release_interface(struct libusb_device_handle *dev_handle, int iface) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  IOReturn kresult;
-
-  /* current interface */
-  struct darwin_interface *cInterface = &priv->interfaces[iface];
-
-  /* Check to see if an interface is open */
-  if (!cInterface->interface)
-    return LIBUSB_SUCCESS;
-
-  /* clean up endpoint data */
-  cInterface->num_endpoints = 0;
-
-  /* delete the interface's async event source */
-  if (cInterface->cfSource) {
-    CFRunLoopRemoveSource (libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
-    CFRelease (cInterface->cfSource);
-  }
-
-  kresult = (*(cInterface->interface))->USBInterfaceClose(cInterface->interface);
-  if (kresult)
-    usbi_warn (HANDLE_CTX (dev_handle), "USBInterfaceClose: %s", darwin_error_str(kresult));
-
-  kresult = (*(cInterface->interface))->Release(cInterface->interface);
-  if (kresult != kIOReturnSuccess)
-    usbi_warn (HANDLE_CTX (dev_handle), "Release: %s", darwin_error_str(kresult));
-
-  cInterface->interface = IO_OBJECT_NULL;
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_set_interface_altsetting(struct libusb_device_handle *dev_handle, int iface, int altsetting) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  IOReturn kresult;
-
-  /* current interface */
-  struct darwin_interface *cInterface = &priv->interfaces[iface];
-
-  if (!cInterface->interface)
-    return LIBUSB_ERROR_NO_DEVICE;
-
-  kresult = (*(cInterface->interface))->SetAlternateInterface (cInterface->interface, altsetting);
-  if (kresult != kIOReturnSuccess)
-    darwin_reset_device (dev_handle);
-
-  /* update list of endpoints */
-  kresult = get_endpoints (dev_handle, iface);
-  if (kresult) {
-    /* this should not happen */
-    darwin_release_interface (dev_handle, iface);
-    usbi_err (HANDLE_CTX (dev_handle), "could not build endpoint table");
-    return kresult;
-  }
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-
-  /* current interface */
-  struct darwin_interface *cInterface;
-  uint8_t pipeRef, iface;
-  IOReturn kresult;
-
-  /* determine the interface/endpoint to use */
-  if (ep_to_pipeRef (dev_handle, endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (HANDLE_CTX (dev_handle), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  /* newer versions of darwin support clearing additional bits on the device's endpoint */
-  kresult = (*(cInterface->interface))->ClearPipeStallBothEnds(cInterface->interface, pipeRef);
-  if (kresult)
-    usbi_warn (HANDLE_CTX (dev_handle), "ClearPipeStall: %s", darwin_error_str (kresult));
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_reset_device(struct libusb_device_handle *dev_handle) {
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-  IOUSBDeviceDescriptor descriptor;
-  IOUSBConfigurationDescriptorPtr cached_configuration;
-  IOUSBConfigurationDescriptor configuration;
-  bool reenumerate = false;
-  IOReturn kresult;
-  int i;
-
-  kresult = (*(dpriv->device))->ResetDevice (dpriv->device);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "ResetDevice: %s", darwin_error_str (kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  do {
-    usbi_dbg ("darwin/reset_device: checking if device descriptor changed");
-
-    /* ignore return code. if we can't get a descriptor it might be worthwhile re-enumerating anway */
-    (void) darwin_request_descriptor (dpriv->device, kUSBDeviceDesc, 0, &descriptor, sizeof (descriptor));
-
-    /* check if the device descriptor has changed */
-    if (0 != memcmp (&dpriv->dev_descriptor, &descriptor, sizeof (descriptor))) {
-      reenumerate = true;
-      break;
-    }
-
-    /* check if any configuration descriptor has changed */
-    for (i = 0 ; i < descriptor.bNumConfigurations ; ++i) {
-      usbi_dbg ("darwin/reset_device: checking if configuration descriptor %d changed", i);
-
-      (void) darwin_request_descriptor (dpriv->device, kUSBConfDesc, i, &configuration, sizeof (configuration));
-      (*(dpriv->device))->GetConfigurationDescriptorPtr (dpriv->device, i, &cached_configuration);
-
-      if (!cached_configuration || 0 != memcmp (cached_configuration, &configuration, sizeof (configuration))) {
-        reenumerate = true;
-        break;
-      }
-    }
-  } while (0);
-
-  if (reenumerate) {
-    usbi_dbg ("darwin/reset_device: device requires reenumeration");
-    (void) (*(dpriv->device))->USBDeviceReEnumerate (dpriv->device, 0);
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  usbi_dbg ("darwin/reset_device: device reset complete");
-
-  return LIBUSB_SUCCESS;
-}
-
-static int darwin_kernel_driver_active(struct libusb_device_handle *dev_handle, int interface) {
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(dev_handle->dev);
-  io_service_t usbInterface;
-  CFTypeRef driver;
-  IOReturn kresult;
-
-  kresult = darwin_get_interface (dpriv->device, interface, &usbInterface);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "darwin_get_interface: %s", darwin_error_str(kresult));
-
-    return darwin_to_libusb (kresult);
-  }
-
-  driver = IORegistryEntryCreateCFProperty (usbInterface, kIOBundleIdentifierKey, kCFAllocatorDefault, 0);
-  IOObjectRelease (usbInterface);
-
-  if (driver) {
-    CFRelease (driver);
-
-    return 1;
-  }
-
-  /* no driver */
-  return 0;
-}
-
-/* attaching/detaching kernel drivers is not currently supported (maybe in the future?) */
-static int darwin_attach_kernel_driver (struct libusb_device_handle *dev_handle, int interface) {
-  (void)dev_handle;
-  (void)interface;
-  return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static int darwin_detach_kernel_driver (struct libusb_device_handle *dev_handle, int interface) {
-  (void)dev_handle;
-  (void)interface;
-  return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static void darwin_destroy_device(struct libusb_device *dev) {
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *) dev->os_priv;
-
-  if (dpriv->dev) {
-    /* need to hold the lock in case this is the last reference to the device */
-    usbi_mutex_lock(&darwin_cached_devices_lock);
-    darwin_deref_cached_device (dpriv->dev);
-    dpriv->dev = NULL;
-    usbi_mutex_unlock(&darwin_cached_devices_lock);
-  }
-}
-
-static int submit_bulk_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-
-  IOReturn               ret;
-  uint8_t                transferType;
-  /* None of the values below are used in libusbx for bulk transfers */
-  uint8_t                direction, number, interval, pipeRef, iface;
-  uint16_t               maxPacketSize;
-
-  struct darwin_interface *cInterface;
-
-  if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
-                                                 &transferType, &maxPacketSize, &interval);
-
-  if (0 != (transfer->length % maxPacketSize)) {
-    /* do not need a zero packet */
-    transfer->flags &= ~LIBUSB_TRANSFER_ADD_ZERO_PACKET;
-  }
-
-  /* submit the request */
-  /* timeouts are unavailable on interrupt endpoints */
-  if (transferType == kUSBInterrupt) {
-    if (IS_XFERIN(transfer))
-      ret = (*(cInterface->interface))->ReadPipeAsync(cInterface->interface, pipeRef, transfer->buffer,
-                                                      transfer->length, darwin_async_io_callback, itransfer);
-    else
-      ret = (*(cInterface->interface))->WritePipeAsync(cInterface->interface, pipeRef, transfer->buffer,
-                                                       transfer->length, darwin_async_io_callback, itransfer);
-  } else {
-    itransfer->flags |= USBI_TRANSFER_OS_HANDLES_TIMEOUT;
-
-    if (IS_XFERIN(transfer))
-      ret = (*(cInterface->interface))->ReadPipeAsyncTO(cInterface->interface, pipeRef, transfer->buffer,
-                                                        transfer->length, transfer->timeout, transfer->timeout,
-                                                        darwin_async_io_callback, (void *)itransfer);
-    else
-      ret = (*(cInterface->interface))->WritePipeAsyncTO(cInterface->interface, pipeRef, transfer->buffer,
-                                                         transfer->length, transfer->timeout, transfer->timeout,
-                                                         darwin_async_io_callback, (void *)itransfer);
-  }
-
-  if (ret)
-    usbi_err (TRANSFER_CTX (transfer), "bulk transfer failed (dir = %s): %s (code = 0x%08x)", IS_XFERIN(transfer) ? "In" : "Out",
-               darwin_error_str(ret), ret);
-
-  return darwin_to_libusb (ret);
-}
-
-static int submit_iso_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-
-  IOReturn kresult;
-  uint8_t direction, number, interval, pipeRef, iface, transferType;
-  uint16_t maxPacketSize;
-  UInt64 frame;
-  AbsoluteTime atTime;
-  int i;
-
-  struct darwin_interface *cInterface;
-
-  /* construct an array of IOUSBIsocFrames, reuse the old one if possible */
-  if (tpriv->isoc_framelist && tpriv->num_iso_packets != transfer->num_iso_packets) {
-    free(tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-  }
-
-  if (!tpriv->isoc_framelist) {
-    tpriv->num_iso_packets = transfer->num_iso_packets;
-    tpriv->isoc_framelist = (IOUSBIsocFrame*) calloc (transfer->num_iso_packets, sizeof(IOUSBIsocFrame));
-    if (!tpriv->isoc_framelist)
-      return LIBUSB_ERROR_NO_MEM;
-  }
-
-  /* copy the frame list from the libusbx descriptor (the structures differ only is member order) */
-  for (i = 0 ; i < transfer->num_iso_packets ; i++)
-    tpriv->isoc_framelist[i].frReqCount = transfer->iso_packet_desc[i].length;
-
-  /* determine the interface/endpoint to use */
-  if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  /* determine the properties of this endpoint and the speed of the device */
-  (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
-                                                 &transferType, &maxPacketSize, &interval);
-
-  /* Last but not least we need the bus frame number */
-  kresult = (*(cInterface->interface))->GetBusFrameNumber(cInterface->interface, &frame, &atTime);
-  if (kresult) {
-    usbi_err (TRANSFER_CTX (transfer), "failed to get bus frame number: %d", kresult);
-    free(tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-
-    return darwin_to_libusb (kresult);
-  }
-
-  (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
-                                                 &transferType, &maxPacketSize, &interval);
-
-  /* schedule for a frame a little in the future */
-  frame += 4;
-
-  if (cInterface->frames[transfer->endpoint] && frame < cInterface->frames[transfer->endpoint])
-    frame = cInterface->frames[transfer->endpoint];
-
-  /* submit the request */
-  if (IS_XFERIN(transfer))
-    kresult = (*(cInterface->interface))->ReadIsochPipeAsync(cInterface->interface, pipeRef, transfer->buffer, frame,
-                                                             transfer->num_iso_packets, tpriv->isoc_framelist, darwin_async_io_callback,
-                                                             itransfer);
-  else
-    kresult = (*(cInterface->interface))->WriteIsochPipeAsync(cInterface->interface, pipeRef, transfer->buffer, frame,
-                                                              transfer->num_iso_packets, tpriv->isoc_framelist, darwin_async_io_callback,
-                                                              itransfer);
-
-  if (LIBUSB_SPEED_FULL == transfer->dev_handle->dev->speed)
-    /* Full speed */
-    cInterface->frames[transfer->endpoint] = frame + transfer->num_iso_packets * (1 << (interval - 1));
-  else
-    /* High/super speed */
-    cInterface->frames[transfer->endpoint] = frame + transfer->num_iso_packets * (1 << (interval - 1)) / 8;
-
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (TRANSFER_CTX (transfer), "isochronous transfer failed (dir: %s): %s", IS_XFERIN(transfer) ? "In" : "Out",
-               darwin_error_str(kresult));
-    free (tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-  }
-
-  return darwin_to_libusb (kresult);
-}
-
-static int submit_control_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct libusb_control_setup *setup = (struct libusb_control_setup *) transfer->buffer;
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(transfer->dev_handle->dev);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-
-  IOReturn               kresult;
-
-  bzero(&tpriv->req, sizeof(tpriv->req));
-
-  /* IOUSBDeviceInterface expects the request in cpu endianess */
-  tpriv->req.bmRequestType     = setup->bmRequestType;
-  tpriv->req.bRequest          = setup->bRequest;
-  /* these values should be in bus order from libusb_fill_control_setup */
-  tpriv->req.wValue            = OSSwapLittleToHostInt16 (setup->wValue);
-  tpriv->req.wIndex            = OSSwapLittleToHostInt16 (setup->wIndex);
-  tpriv->req.wLength           = OSSwapLittleToHostInt16 (setup->wLength);
-  /* data is stored after the libusbx control block */
-  tpriv->req.pData             = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
-  tpriv->req.completionTimeout = transfer->timeout;
-  tpriv->req.noDataTimeout     = transfer->timeout;
-
-  itransfer->flags |= USBI_TRANSFER_OS_HANDLES_TIMEOUT;
-
-  /* all transfers in libusb-1.0 are async */
-
-  if (transfer->endpoint) {
-    struct darwin_interface *cInterface;
-    uint8_t                 pipeRef, iface;
-
-    if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-      usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-      return LIBUSB_ERROR_NOT_FOUND;
-    }
-
-    cInterface = &priv->interfaces[iface];
-
-    kresult = (*(cInterface->interface))->ControlRequestAsyncTO (cInterface->interface, pipeRef, &(tpriv->req), darwin_async_io_callback, itransfer);
-  } else
-    /* control request on endpoint 0 */
-    kresult = (*(dpriv->device))->DeviceRequestAsyncTO(dpriv->device, &(tpriv->req), darwin_async_io_callback, itransfer);
-
-  if (kresult != kIOReturnSuccess)
-    usbi_err (TRANSFER_CTX (transfer), "control request failed: %s", darwin_error_str(kresult));
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_submit_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-  switch (transfer->type) {
-  case LIBUSB_TRANSFER_TYPE_CONTROL:
-    return submit_control_transfer(itransfer);
-  case LIBUSB_TRANSFER_TYPE_BULK:
-  case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-    return submit_bulk_transfer(itransfer);
-  case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-    return submit_iso_transfer(itransfer);
-  default:
-    usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-    return LIBUSB_ERROR_INVALID_PARAM;
-  }
-}
-
-static int cancel_control_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(transfer->dev_handle->dev);
-  IOReturn kresult;
-
-  usbi_warn (ITRANSFER_CTX (itransfer), "aborting all transactions control pipe");
-
-  if (!dpriv->device)
-    return LIBUSB_ERROR_NO_DEVICE;
-
-  kresult = (*(dpriv->device))->USBDeviceAbortPipeZero (dpriv->device);
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_abort_transfers (struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_cached_device *dpriv = DARWIN_CACHED_DEVICE(transfer->dev_handle->dev);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-  struct darwin_interface *cInterface;
-  uint8_t pipeRef, iface;
-  IOReturn kresult;
-
-  if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  if (!dpriv->device)
-    return LIBUSB_ERROR_NO_DEVICE;
-
-  usbi_warn (ITRANSFER_CTX (itransfer), "aborting all transactions on interface %d pipe %d", iface, pipeRef);
-
-  /* abort transactions */
-  (*(cInterface->interface))->AbortPipe (cInterface->interface, pipeRef);
-
-  usbi_dbg ("calling clear pipe stall to clear the data toggle bit");
-
-  /* newer versions of darwin support clearing additional bits on the device's endpoint */
-  kresult = (*(cInterface->interface))->ClearPipeStallBothEnds(cInterface->interface, pipeRef);
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_cancel_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-  switch (transfer->type) {
-  case LIBUSB_TRANSFER_TYPE_CONTROL:
-    return cancel_control_transfer(itransfer);
-  case LIBUSB_TRANSFER_TYPE_BULK:
-  case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-  case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-    return darwin_abort_transfers (itransfer);
-  default:
-    usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-    return LIBUSB_ERROR_INVALID_PARAM;
-  }
-}
-
-static void darwin_clear_transfer_priv (struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-
-  if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS && tpriv->isoc_framelist) {
-    free (tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-  }
-}
-
-static void darwin_async_io_callback (void *refcon, IOReturn result, void *arg0) {
-  struct usbi_transfer *itransfer = (struct usbi_transfer *)refcon;
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-  struct darwin_msg_async_io_complete message = {.itransfer = itransfer, .result = result,
-                                                 .size = (UInt32) (uintptr_t) arg0};
-
-  usbi_dbg ("an async io operation has completed");
-
-  /* if requested write a zero packet */
-  if (kIOReturnSuccess == result && IS_XFEROUT(transfer) && transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
-    struct darwin_interface *cInterface;
-    uint8_t iface, pipeRef;
-
-    (void) ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface);
-    cInterface = &priv->interfaces[iface];
-
-    (*(cInterface->interface))->WritePipe (cInterface->interface, pipeRef, transfer->buffer, 0);
-  }
-
-  /* send a completion message to the device's file descriptor */
-  write (priv->fds[1], &message, sizeof (message));
-}
-
-static int darwin_transfer_status (struct usbi_transfer *itransfer, kern_return_t result) {
-  if (itransfer->flags & USBI_TRANSFER_TIMED_OUT)
-    result = kIOUSBTransactionTimeout;
-
-  switch (result) {
-  case kIOReturnUnderrun:
-  case kIOReturnSuccess:
-    return LIBUSB_TRANSFER_COMPLETED;
-  case kIOReturnAborted:
-    return LIBUSB_TRANSFER_CANCELLED;
-  case kIOUSBPipeStalled:
-    usbi_dbg ("transfer error: pipe is stalled");
-    return LIBUSB_TRANSFER_STALL;
-  case kIOReturnOverrun:
-    usbi_warn (ITRANSFER_CTX (itransfer), "transfer error: data overrun");
-    return LIBUSB_TRANSFER_OVERFLOW;
-  case kIOUSBTransactionTimeout:
-    usbi_warn (ITRANSFER_CTX (itransfer), "transfer error: timed out");
-    itransfer->flags |= USBI_TRANSFER_TIMED_OUT;
-    return LIBUSB_TRANSFER_TIMED_OUT;
-  default:
-    usbi_warn (ITRANSFER_CTX (itransfer), "transfer error: %s (value = 0x%08x)", darwin_error_str (result), result);
-    return LIBUSB_TRANSFER_ERROR;
-  }
-}
-
-static void darwin_handle_callback (struct usbi_transfer *itransfer, kern_return_t result, UInt32 io_size) {
-  struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-  int isIsoc      = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS == transfer->type;
-  int isBulk      = LIBUSB_TRANSFER_TYPE_BULK == transfer->type;
-  int isControl   = LIBUSB_TRANSFER_TYPE_CONTROL == transfer->type;
-  int isInterrupt = LIBUSB_TRANSFER_TYPE_INTERRUPT == transfer->type;
-  int i;
-
-  if (!isIsoc && !isBulk && !isControl && !isInterrupt) {
-    usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-    return;
-  }
-
-  usbi_dbg ("handling %s completion with kernel status %d",
-             isControl ? "control" : isBulk ? "bulk" : isIsoc ? "isoc" : "interrupt", result);
-
-  if (kIOReturnSuccess == result || kIOReturnUnderrun == result) {
-    if (isIsoc && tpriv->isoc_framelist) {
-      /* copy isochronous results back */
-
-      for (i = 0; i < transfer->num_iso_packets ; i++) {
-        struct libusb_iso_packet_descriptor *lib_desc = &transfer->iso_packet_desc[i];
-        lib_desc->status = darwin_to_libusb (tpriv->isoc_framelist[i].frStatus);
-        lib_desc->actual_length = tpriv->isoc_framelist[i].frActCount;
-      }
-    } else if (!isIsoc)
-      itransfer->transferred += io_size;
-  }
-
-  /* it is ok to handle cancelled transfers without calling usbi_handle_transfer_cancellation (we catch timeout transfers) */
-  usbi_handle_transfer_completion (itransfer, darwin_transfer_status (itransfer, result));
-}
-
-static int op_handle_events(struct libusb_context *ctx, struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready) {
-  struct darwin_msg_async_io_complete message;
-  POLL_NFDS_TYPE i = 0;
-  ssize_t ret;
-
-  usbi_mutex_lock(&ctx->open_devs_lock);
-
-  for (i = 0; i < nfds && num_ready > 0; i++) {
-    struct pollfd *pollfd = &fds[i];
-
-    usbi_dbg ("checking fd %i with revents = %x", pollfd->fd, pollfd->revents);
-
-    if (!pollfd->revents)
-      continue;
-
-    num_ready--;
-
-    if (pollfd->revents & POLLERR) {
-      /* this probably will never happen so ignore the error an move on. */
-      continue;
-    }
-
-    /* there is only one type of message */
-    ret = read (pollfd->fd, &message, sizeof (message));
-    if (ret < (ssize_t) sizeof (message)) {
-      usbi_dbg ("WARNING: short read on async io completion pipe\n");
-      continue;
-    }
-
-    darwin_handle_callback (message.itransfer, message.result, message.size);
-  }
-
-  usbi_mutex_unlock(&ctx->open_devs_lock);
-
-  return 0;
-}
-
-static int darwin_clock_gettime(int clk_id, struct timespec *tp) {
-  mach_timespec_t sys_time;
-  clock_serv_t clock_ref;
-
-  switch (clk_id) {
-  case USBI_CLOCK_REALTIME:
-    /* CLOCK_REALTIME represents time since the epoch */
-    clock_ref = clock_realtime;
-    break;
-  case USBI_CLOCK_MONOTONIC:
-    /* use system boot time as reference for the monotonic clock */
-    clock_ref = clock_monotonic;
-    break;
-  default:
-    return LIBUSB_ERROR_INVALID_PARAM;
-  }
-
-  clock_get_time (clock_ref, &sys_time);
-
-  tp->tv_sec  = sys_time.tv_sec;
-  tp->tv_nsec = sys_time.tv_nsec;
-
-  return 0;
-}
-
-const struct usbi_os_backend darwin_backend = {
-        .name = "Darwin",
-        .caps = 0,
-        .init = darwin_init,
-        .exit = darwin_exit,
-        .get_device_list = NULL, /* not needed */
-        .get_device_descriptor = darwin_get_device_descriptor,
-        .get_active_config_descriptor = darwin_get_active_config_descriptor,
-        .get_config_descriptor = darwin_get_config_descriptor,
-
-        .open = darwin_open,
-        .close = darwin_close,
-        .get_configuration = darwin_get_configuration,
-        .set_configuration = darwin_set_configuration,
-        .claim_interface = darwin_claim_interface,
-        .release_interface = darwin_release_interface,
-
-        .set_interface_altsetting = darwin_set_interface_altsetting,
-        .clear_halt = darwin_clear_halt,
-        .reset_device = darwin_reset_device,
-
-        .kernel_driver_active = darwin_kernel_driver_active,
-        .detach_kernel_driver = darwin_detach_kernel_driver,
-        .attach_kernel_driver = darwin_attach_kernel_driver,
-
-        .destroy_device = darwin_destroy_device,
-
-        .submit_transfer = darwin_submit_transfer,
-        .cancel_transfer = darwin_cancel_transfer,
-        .clear_transfer_priv = darwin_clear_transfer_priv,
-
-        .handle_events = op_handle_events,
-
-        .clock_gettime = darwin_clock_gettime,
-
-        .device_priv_size = sizeof(struct darwin_device_priv),
-        .device_handle_priv_size = sizeof(struct darwin_device_handle_priv),
-        .transfer_priv_size = sizeof(struct darwin_transfer_priv),
-        .add_iso_packet_size = 0,
-};
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/darwin_usb.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/darwin_usb.h
deleted file mode 100644
index 53b8542b13..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/darwin_usb.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/*
- * darwin backend for libusbx 1.0
- * Copyright © 2008-2013 Nathan Hjelm <hjelmn@users.sourceforge.net>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#if !defined(LIBUSB_DARWIN_H)
-#define LIBUSB_DARWIN_H
-
-#include "libusbi.h"
-
-#include <IOKit/IOTypes.h>
-#include <IOKit/IOCFBundle.h>
-#include <IOKit/usb/IOUSBLib.h>
-#include <IOKit/IOCFPlugIn.h>
-
-/* IOUSBInterfaceInferface */
-#if defined (kIOUSBInterfaceInterfaceID550)
-
-#define usb_interface_t IOUSBInterfaceInterface550
-#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID550
-#define InterfaceVersion 550
-
-#elif defined (kIOUSBInterfaceInterfaceID500)
-
-#define usb_interface_t IOUSBInterfaceInterface500
-#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID500
-#define InterfaceVersion 500
-
-#elif defined (kIOUSBInterfaceInterfaceID300)
-
-#define usb_interface_t IOUSBInterfaceInterface300
-#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID300
-#define InterfaceVersion 300
-
-#elif defined (kIOUSBInterfaceInterfaceID245)
-
-#define usb_interface_t IOUSBInterfaceInterface245
-#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID245
-#define InterfaceVersion 245
-
-#elif defined (kIOUSBInterfaceInterfaceID220)
-
-#define usb_interface_t IOUSBInterfaceInterface220
-#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID220
-#define InterfaceVersion 220
-
-#else
-
-#error "IOUSBFamily is too old. Please upgrade your OS"
-
-#endif
-
-/* IOUSBDeviceInterface */
-#if defined (kIOUSBDeviceInterfaceID500)
-
-#define usb_device_t    IOUSBDeviceInterface500
-#define DeviceInterfaceID kIOUSBDeviceInterfaceID500
-#define DeviceVersion 500
-
-#elif defined (kIOUSBDeviceInterfaceID320)
-
-#define usb_device_t    IOUSBDeviceInterface320
-#define DeviceInterfaceID kIOUSBDeviceInterfaceID320
-#define DeviceVersion 320
-
-#elif defined (kIOUSBDeviceInterfaceID300)
-
-#define usb_device_t    IOUSBDeviceInterface300
-#define DeviceInterfaceID kIOUSBDeviceInterfaceID300
-#define DeviceVersion 300
-
-#elif defined (kIOUSBDeviceInterfaceID245)
-
-#define usb_device_t    IOUSBDeviceInterface245
-#define DeviceInterfaceID kIOUSBDeviceInterfaceID245
-#define DeviceVersion 245
-
-#elif defined (kIOUSBDeviceInterfaceID220)
-#define usb_device_t    IOUSBDeviceInterface197
-#define DeviceInterfaceID kIOUSBDeviceInterfaceID197
-#define DeviceVersion 197
-
-#else
-
-#error "IOUSBFamily is too old. Please upgrade your OS"
-
-#endif
-
-#if !defined(IO_OBJECT_NULL)
-#define IO_OBJECT_NULL ((io_object_t) 0)
-#endif
-
-typedef IOCFPlugInInterface *io_cf_plugin_ref_t;
-typedef IONotificationPortRef io_notification_port_t;
-
-/* private structures */
-struct darwin_cached_device {
-  struct list_head      list;
-  IOUSBDeviceDescriptor dev_descriptor;
-  UInt32                location;
-  UInt64                parent_session;
-  UInt64                session;
-  UInt16                address;
-  char                  sys_path[21];
-  usb_device_t        **device;
-  int                   open_count;
-  UInt8                 first_config, active_config, port;  
-  int                   can_enumerate;
-  int                   refcount;
-};
-
-struct darwin_device_priv {
-  struct darwin_cached_device *dev;
-};
-
-struct darwin_device_handle_priv {
-  int                  is_open;
-  CFRunLoopSourceRef   cfSource;
-  int                  fds[2];
-
-  struct darwin_interface {
-    usb_interface_t    **interface;
-    uint8_t              num_endpoints;
-    CFRunLoopSourceRef   cfSource;
-    uint64_t             frames[256];
-    uint8_t            endpoint_addrs[USB_MAXENDPOINTS];
-  } interfaces[USB_MAXINTERFACES];
-};
-
-struct darwin_transfer_priv {
-  /* Isoc */
-  IOUSBIsocFrame *isoc_framelist;
-  int num_iso_packets;
-
-  /* Control */
-  IOUSBDevRequestTO req;
-
-  /* Bulk */
-};
-
-/* structure for signaling io completion */
-struct darwin_msg_async_io_complete {
-  struct usbi_transfer *itransfer;
-  IOReturn result;
-  UInt32 size;
-};
-
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_netlink.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_netlink.c
deleted file mode 100644
index 3a68f69d9c..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_netlink.c
+++ /dev/null
@@ -1,254 +0,0 @@
-/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
-/*
- * Linux usbfs backend for libusb
- * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
- * Copyright (c) 2013 Nathan Hjelm <hjelmn@mac.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <arpa/inet.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-#include "linux_usbfs.h"
-
-#include <linux/netlink.h>
-#include <linux/filter.h>
-
-#define KERNEL 1
-
-static int linux_netlink_socket = -1;
-static pthread_t libusb_linux_event_thread;
-
-static void *linux_netlink_event_thread_main(void *arg);
-
-struct sockaddr_nl snl = { .nl_family=AF_NETLINK, .nl_groups=KERNEL };
-
-int linux_netlink_start_event_monitor(void)
-{
-	int ret;
-
-	snl.nl_groups = KERNEL;
-
-	linux_netlink_socket = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_KOBJECT_UEVENT);
-	if (-1 == linux_netlink_socket) {
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	ret = bind(linux_netlink_socket, (struct sockaddr *) &snl, sizeof(snl));
-	if (0 != ret) {
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	/* TODO -- add authentication */
-	/* setsockopt(linux_netlink_socket, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); */
-
-	ret = pthread_create(&libusb_linux_event_thread, NULL, linux_netlink_event_thread_main, NULL);
-	if (0 != ret) {
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-int linux_netlink_stop_event_monitor(void)
-{
-	int r;
-
-	if (-1 == linux_netlink_socket) {
-		/* already closed. nothing to do */
-		return LIBUSB_SUCCESS;
-	}
-
-	r = close(linux_netlink_socket);
-	if (0 > r) {
-		usbi_err(NULL, "error closing netlink socket. %s", strerror(errno));
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	pthread_cancel(libusb_linux_event_thread);
-
-	linux_netlink_socket = -1;
-
-	return LIBUSB_SUCCESS;
-}
-
-static const char *netlink_message_parse (const char *buffer, size_t len, const char *key)
-{
-	size_t keylen = strlen(key);
-	size_t offset;
-
-	for (offset = 0 ; offset < len && '\0' != buffer[offset] ; offset += strlen(buffer + offset) + 1) {
-		if (0 == strncmp(buffer + offset, key, keylen) &&
-		    '=' == buffer[offset + keylen]) {
-			return buffer + offset + keylen + 1;
-		}
-	}
-
-	return NULL;
-}
-
-/* parse parts of netlink message common to both libudev and the kernel */
-static int linux_netlink_parse(char *buffer, size_t len, int *detached, const char **sys_name,
-			       uint8_t *busnum, uint8_t *devaddr) {
-	const char *tmp;
-	int i;
-
-	errno = 0;
-
-	*sys_name = NULL;
-	*detached = 0;
-	*busnum   = 0;
-	*devaddr  = 0;
-
-	tmp = netlink_message_parse((const char *) buffer, len, "ACTION");
-	if (tmp == NULL)
-		return -1;
-	if (0 == strcmp(tmp, "remove")) {
-		*detached = 1;
-	} else if (0 != strcmp(tmp, "add")) {
-		usbi_dbg("unknown device action %s", tmp);
-		return -1;
-	}
-
-	/* check that this is a usb message */
-	tmp = netlink_message_parse(buffer, len, "SUBSYSTEM");
-	if (NULL == tmp || 0 != strcmp(tmp, "usb")) {
-		/* not usb. ignore */
-		return -1;
-	}
-
-	tmp = netlink_message_parse(buffer, len, "BUSNUM");
-	if (NULL == tmp) {
-		/* no bus number (likely a usb interface). ignore*/
-		return -1;
-	}
-
-	*busnum = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
-	if (errno) {
-		errno = 0;
-		return -1;
-	}
-
-	tmp = netlink_message_parse(buffer, len, "DEVNUM");
-	if (NULL == tmp) {
-		return -1;
-	}
-
-	*devaddr = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
-	if (errno) {
-		errno = 0;
-		return -1;
-	}
-
-	tmp = netlink_message_parse(buffer, len, "DEVPATH");
-	if (NULL == tmp) {
-		return -1;
-	}
-
-	for (i = strlen(tmp) - 1 ; i ; --i) {
-		if ('/' ==tmp[i]) {
-			*sys_name = tmp + i + 1;
-			break;
-		}
-	}
-
-	/* found a usb device */
-	return 0;
-}
-
-static int linux_netlink_read_message(void)
-{
-	unsigned char buffer[1024];
-	struct iovec iov = {.iov_base = buffer, .iov_len = sizeof(buffer)};
-	struct msghdr meh = { .msg_iov=&iov, .msg_iovlen=1,
-			     .msg_name=&snl, .msg_namelen=sizeof(snl) };
-	const char *sys_name = NULL;
-	uint8_t busnum, devaddr;
-	int detached, r;
-	size_t len;
-
-	/* read netlink message */
-	memset(buffer, 0, sizeof(buffer));
-	len = recvmsg(linux_netlink_socket, &meh, 0);
-	if (len < 32) {
-		if (errno != EAGAIN)
-			usbi_dbg("error recieving message from netlink");
-		return -1;
-	}
-
-	/* TODO -- authenticate this message is from the kernel or udevd */
-
-	r = linux_netlink_parse(buffer, len, &detached, &sys_name,
-				&busnum, &devaddr);
-	if (r)
-		return r;
-
-	usbi_dbg("netlink hotplug found device busnum: %hhu, devaddr: %hhu, sys_name: %s, removed: %s",
-		 busnum, devaddr, sys_name, detached ? "yes" : "no");
-
-	/* signal device is available (or not) to all contexts */
-	if (detached)
-		linux_hotplug_disconnected(busnum, devaddr, sys_name);
-	else
-		linux_hotplug_enumerate(busnum, devaddr, sys_name);
-
-	return 0;
-}
-
-static void *linux_netlink_event_thread_main(void *arg)
-{
-	struct pollfd fds = {.fd = linux_netlink_socket,
-			     .events = POLLIN};
-
-	/* silence compiler warning */
-	(void) arg;
-
-	while (1 == poll(&fds, 1, -1)) {
-		if (POLLIN != fds.revents) {
-			break;
-		}
-
-		usbi_mutex_static_lock(&linux_hotplug_lock);
-		linux_netlink_read_message();
-		usbi_mutex_static_unlock(&linux_hotplug_lock);
-	}
-
-	return NULL;
-}
-
-void linux_netlink_hotplug_poll(void)
-{
-	int r;
-
-	usbi_mutex_static_lock(&linux_hotplug_lock);
-	do {
-		r = linux_netlink_read_message();
-	} while (r == 0);
-	usbi_mutex_static_unlock(&linux_hotplug_lock);
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_udev.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_udev.c
deleted file mode 100644
index 5a2aadfd44..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_udev.c
+++ /dev/null
@@ -1,273 +0,0 @@
-/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
-/*
- * Linux usbfs backend for libusb
- * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
- * Copyright (c) 2012-2013 Nathan Hjelm <hjelmn@mac.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-
-#include <assert.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/utsname.h>
-#include <sys/socket.h>
-#include <unistd.h>
-#include <libudev.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-#include "linux_usbfs.h"
-
-/* udev context */
-static struct udev *udev_ctx = NULL;
-static int udev_monitor_fd = -1;
-static struct udev_monitor *udev_monitor = NULL;
-static pthread_t linux_event_thread;
-
-static void udev_hotplug_event(struct udev_device* udev_dev);
-static void *linux_udev_event_thread_main(void *arg);
-
-int linux_udev_start_event_monitor(void)
-{
-	int r;
-
-	assert(udev_ctx == NULL);
-	udev_ctx = udev_new();
-	if (!udev_ctx) {
-		usbi_err(NULL, "could not create udev context");
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	udev_monitor = udev_monitor_new_from_netlink(udev_ctx, "udev");
-	if (!udev_monitor) {
-		usbi_err(NULL, "could not initialize udev monitor");
-		goto err_free_ctx;
-	}
-
-	r = udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "usb", 0);
-	if (r) {
-		usbi_err(NULL, "could not initialize udev monitor filter for \"usb\" subsystem");
-		goto err_free_monitor;
-	}
-
-	if (udev_monitor_enable_receiving(udev_monitor)) {
-		usbi_err(NULL, "failed to enable the udev monitor");
-		goto err_free_monitor;
-	}
-
-	udev_monitor_fd = udev_monitor_get_fd(udev_monitor);
-
-	/* Some older versions of udev are not non-blocking by default,
-	 * so make sure this is set */
-	r = fcntl(udev_monitor_fd, F_GETFL);
-	if (r == -1) {
-		usbi_err(NULL, "getting udev monitor fd flags (%d)", errno);
-		goto err_free_monitor;
-	}
-	r = fcntl(udev_monitor_fd, F_SETFL, r | O_NONBLOCK);
-	if (r) {
-		usbi_err(NULL, "setting udev monitor fd flags (%d)", errno);
-		goto err_free_monitor;
-	}
-
-	r = pthread_create(&linux_event_thread, NULL, linux_udev_event_thread_main, NULL);
-	if (r) {
-		usbi_err(NULL, "creating hotplug event thread (%d)", r);
-		goto err_free_monitor;
-	}
-
-	return LIBUSB_SUCCESS;
-
-err_free_monitor:
-	udev_monitor_unref(udev_monitor);
-	udev_monitor = NULL;
-	udev_monitor_fd = -1;
-err_free_ctx:
-	udev_unref(udev_ctx);
-	udev_ctx = NULL;
-	return LIBUSB_ERROR_OTHER;
-}
-
-int linux_udev_stop_event_monitor(void)
-{
-	assert(udev_ctx != NULL);
-	assert(udev_monitor != NULL);
-	assert(udev_monitor_fd != -1);
-
-	/* Cancel the event thread. This is the only way to guarantee the
-	   thread exits since closing the monitor fd won't necessarily cause
-	   poll to return. */
-	pthread_cancel(linux_event_thread);
-	pthread_join(linux_event_thread, NULL);
-
-	/* Release the udev monitor */
-	udev_monitor_unref(udev_monitor);
-	udev_monitor = NULL;
-	udev_monitor_fd = -1;
-
-	/* Clean up the udev context */
-	udev_unref(udev_ctx);
-	udev_ctx = NULL;
-
-	return LIBUSB_SUCCESS;
-}
-
-static void *linux_udev_event_thread_main(void *arg)
-{
-	struct udev_device* udev_dev;
-	struct pollfd fds = {.fd = udev_monitor_fd,
-			     .events = POLLIN};
-
-	usbi_dbg("udev event thread entering.");
-
-	while (1 == poll(&fds, 1, -1)) {
-		if (NULL == udev_monitor || POLLIN != fds.revents) {
-			break;
-		}
-
-		usbi_mutex_static_lock(&linux_hotplug_lock);
-		udev_dev = udev_monitor_receive_device(udev_monitor);
-		if (udev_dev)
-			udev_hotplug_event(udev_dev);
-		usbi_mutex_static_unlock(&linux_hotplug_lock);
-	}
-
-	usbi_dbg("udev event thread exiting");
-
-	return NULL;
-}
-
-static int udev_device_info(struct libusb_context *ctx, int detached,
-			    struct udev_device *udev_dev, uint8_t *busnum,
-			    uint8_t *devaddr, const char **sys_name) {
-	const char *dev_node;
-
-	dev_node = udev_device_get_devnode(udev_dev);
-	if (!dev_node) {
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	*sys_name = udev_device_get_sysname(udev_dev);
-	if (!*sys_name) {
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	return linux_get_device_address(ctx, detached, busnum, devaddr,
-					dev_node, *sys_name);
-}
-
-static void udev_hotplug_event(struct udev_device* udev_dev)
-{
-	const char* udev_action;
-	const char* sys_name = NULL;
-	uint8_t busnum = 0, devaddr = 0;
-	int detached;
-	int r;
-
-	do {
-		udev_action = udev_device_get_action(udev_dev);
-		if (!udev_action) {
-			break;
-		}
-
-		detached = !strncmp(udev_action, "remove", 6);
-
-		r = udev_device_info(NULL, detached, udev_dev, &busnum, &devaddr, &sys_name);
-		if (LIBUSB_SUCCESS != r) {
-			break;
-		}
-
-		usbi_dbg("udev hotplug event. action: %s.", udev_action);
-
-		if (strncmp(udev_action, "add", 3) == 0) {
-			linux_hotplug_enumerate(busnum, devaddr, sys_name);
-		} else if (detached) {
-			linux_hotplug_disconnected(busnum, devaddr, sys_name);
-		} else {
-			usbi_err(NULL, "ignoring udev action %s", udev_action);
-		}
-	} while (0);
-
-	udev_device_unref(udev_dev);
-}
-
-int linux_udev_scan_devices(struct libusb_context *ctx)
-{
-	struct udev_enumerate *enumerator;
-	struct udev_list_entry *devices, *entry;
-	struct udev_device *udev_dev;
-	const char *sys_name;
-	int r;
-
-	assert(udev_ctx != NULL);
-
-	enumerator = udev_enumerate_new(udev_ctx);
-	if (NULL == enumerator) {
-		usbi_err(ctx, "error creating udev enumerator");
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	udev_enumerate_add_match_subsystem(enumerator, "usb");
-	udev_enumerate_scan_devices(enumerator);
-	devices = udev_enumerate_get_list_entry(enumerator);
-
-	udev_list_entry_foreach(entry, devices) {
-		const char *path = udev_list_entry_get_name(entry);
-		uint8_t busnum = 0, devaddr = 0;
-
-		udev_dev = udev_device_new_from_syspath(udev_ctx, path);
-
-		r = udev_device_info(ctx, 0, udev_dev, &busnum, &devaddr, &sys_name);
-		if (r) {
-			udev_device_unref(udev_dev);
-			continue;
-		}
-
-		linux_enumerate_device(ctx, busnum, devaddr, sys_name);
-		udev_device_unref(udev_dev);
-	}
-
-	udev_enumerate_unref(enumerator);
-
-	return LIBUSB_SUCCESS;
-}
-
-void linux_udev_hotplug_poll(void)
-{
-	struct udev_device* udev_dev;
-
-	usbi_mutex_static_lock(&linux_hotplug_lock);
-	do {
-		udev_dev = udev_monitor_receive_device(udev_monitor);
-		if (udev_dev) {
-			usbi_dbg("Handling hotplug event from hotplug_poll");
-			udev_hotplug_event(udev_dev);
-		}
-	} while (udev_dev);
-	usbi_mutex_static_unlock(&linux_hotplug_lock);
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_usbfs.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_usbfs.c
deleted file mode 100644
index 09288af719..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_usbfs.c
+++ /dev/null
@@ -1,2568 +0,0 @@
-/*
- * Linux usbfs backend for libusbx
- * Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- * Copyright © 2013 Nathan Hjelm <hjelmn@mac.com>
- * Copyright © 2012-2013 Hans de Goede <hdegoede@redhat.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-
-#include <assert.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/utsname.h>
-#include <unistd.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-#include "linux_usbfs.h"
-
-/* sysfs vs usbfs:
- * opening a usbfs node causes the device to be resumed, so we attempt to
- * avoid this during enumeration.
- *
- * sysfs allows us to read the kernel's in-memory copies of device descriptors
- * and so forth, avoiding the need to open the device:
- *  - The binary "descriptors" file contains all config descriptors since
- *    2.6.26, commit 217a9081d8e69026186067711131b77f0ce219ed 
- *  - The binary "descriptors" file was added in 2.6.23, commit
- *    69d42a78f935d19384d1f6e4f94b65bb162b36df, but it only contains the
- *    active config descriptors
- *  - The "busnum" file was added in 2.6.22, commit
- *    83f7d958eab2fbc6b159ee92bf1493924e1d0f72
- *  - The "devnum" file has been present since pre-2.6.18
- *  - the "bConfigurationValue" file has been present since pre-2.6.18
- *
- * If we have bConfigurationValue, busnum, and devnum, then we can determine
- * the active configuration without having to open the usbfs node in RDWR mode.
- * The busnum file is important as that is the only way we can relate sysfs
- * devices to usbfs nodes.
- *
- * If we also have all descriptors, we can obtain the device descriptor and
- * configuration without touching usbfs at all.
- */
-
-/* endianness for multi-byte fields:
- *
- * Descriptors exposed by usbfs have the multi-byte fields in the device
- * descriptor as host endian. Multi-byte fields in the other descriptors are
- * bus-endian. The kernel documentation says otherwise, but it is wrong.
- *
- * In sysfs all descriptors are bus-endian.
- */
-
-static const char *usbfs_path = NULL;
-
-/* use usbdev*.* device names in /dev instead of the usbfs bus directories */
-static int usbdev_names = 0;
-
-/* Linux 2.6.32 adds support for a bulk continuation URB flag. this basically
- * allows us to mark URBs as being part of a specific logical transfer when
- * we submit them to the kernel. then, on any error except a cancellation, all
- * URBs within that transfer will be cancelled and no more URBs will be
- * accepted for the transfer, meaning that no more data can creep in.
- *
- * The BULK_CONTINUATION flag must be set on all URBs within a bulk transfer
- * (in either direction) except the first.
- * For IN transfers, we must also set SHORT_NOT_OK on all URBs except the
- * last; it means that the kernel should treat a short reply as an error.
- * For OUT transfers, SHORT_NOT_OK must not be set. it isn't needed (OUT
- * transfers can't be short unless there's already some sort of error), and
- * setting this flag is disallowed (a kernel with USB debugging enabled will
- * reject such URBs).
- */
-static int supports_flag_bulk_continuation = -1;
-
-/* Linux 2.6.31 fixes support for the zero length packet URB flag. This
- * allows us to mark URBs that should be followed by a zero length data
- * packet, which can be required by device- or class-specific protocols.
- */
-static int supports_flag_zero_packet = -1;
-
-/* clock ID for monotonic clock, as not all clock sources are available on all
- * systems. appropriate choice made at initialization time. */
-static clockid_t monotonic_clkid = -1;
-
-/* Linux 2.6.22 (commit 83f7d958eab2fbc6b159ee92bf1493924e1d0f72) adds a busnum
- * to sysfs, so we can relate devices. This also implies that we can read
- * the active configuration through bConfigurationValue */
-static int sysfs_can_relate_devices = -1;
-
-/* Linux 2.6.26 (commit 217a9081d8e69026186067711131b77f0ce219ed) adds all
- * config descriptors (rather then just the active config) to the sysfs
- * descriptors file, so from then on we can use them. */
-static int sysfs_has_descriptors = -1;
-
-/* how many times have we initted (and not exited) ? */
-static volatile int init_count = 0;
-
-/* Serialize hotplug start/stop, scan-devices, event-thread, and poll */
-usbi_mutex_static_t linux_hotplug_lock = USBI_MUTEX_INITIALIZER;
-
-static int linux_start_event_monitor(void);
-static int linux_stop_event_monitor(void);
-static int linux_scan_devices(struct libusb_context *ctx);
-static int sysfs_scan_device(struct libusb_context *ctx, const char *devname);
-static int detach_kernel_driver_and_claim(struct libusb_device_handle *, int);
-
-#if !defined(USE_UDEV)
-static int linux_default_scan_devices (struct libusb_context *ctx);
-#endif
-
-struct linux_device_priv {
-	char *sysfs_dir;
-	unsigned char *descriptors;
-	int descriptors_len;
-	int active_config; /* cache val for !sysfs_can_relate_devices  */
-};
-
-struct linux_device_handle_priv {
-	int fd;
-	uint32_t caps;
-};
-
-enum reap_action {
-	NORMAL = 0,
-	/* submission failed after the first URB, so await cancellation/completion
-	 * of all the others */
-	SUBMIT_FAILED,
-
-	/* cancelled by user or timeout */
-	CANCELLED,
-
-	/* completed multi-URB transfer in non-final URB */
-	COMPLETED_EARLY,
-
-	/* one or more urbs encountered a low-level error */
-	ERROR,
-};
-
-struct linux_transfer_priv {
-	union {
-		struct usbfs_urb *urbs;
-		struct usbfs_urb **iso_urbs;
-	};
-
-	enum reap_action reap_action;
-	int num_urbs;
-	int num_retired;
-	enum libusb_transfer_status reap_status;
-
-	/* next iso packet in user-supplied transfer to be populated */
-	int iso_packet_offset;
-};
-
-static int _get_usbfs_fd(struct libusb_device *dev, mode_t mode, int silent)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	char path[PATH_MAX];
-	int fd;
-
-	if (usbdev_names)
-		snprintf(path, PATH_MAX, "%s/usbdev%d.%d",
-			usbfs_path, dev->bus_number, dev->device_address);
-	else
-		snprintf(path, PATH_MAX, "%s/%03d/%03d",
-			usbfs_path, dev->bus_number, dev->device_address);
-
-	fd = open(path, mode);
-	if (fd != -1)
-		return fd; /* Success */
-
-	if (!silent) {
-		usbi_err(ctx, "libusbx couldn't open USB device %s: %s",
-			 path, strerror(errno));
-		if (errno == EACCES && mode == O_RDWR)
-			usbi_err(ctx, "libusbx requires write access to USB "
-				      "device nodes.");
-	}
-
-	if (errno == EACCES)
-		return LIBUSB_ERROR_ACCESS;
-	if (errno == ENOENT)
-		return LIBUSB_ERROR_NO_DEVICE;
-	return LIBUSB_ERROR_IO;
-}
-
-static struct linux_device_priv *_device_priv(struct libusb_device *dev)
-{
-	return (struct linux_device_priv *) dev->os_priv;
-}
-
-static struct linux_device_handle_priv *_device_handle_priv(
-	struct libusb_device_handle *handle)
-{
-	return (struct linux_device_handle_priv *) handle->os_priv;
-}
-
-/* check dirent for a /dev/usbdev%d.%d name
- * optionally return bus/device on success */
-static int _is_usbdev_entry(struct dirent *entry, int *bus_p, int *dev_p)
-{
-	int busnum, devnum;
-
-	if (sscanf(entry->d_name, "usbdev%d.%d", &busnum, &devnum) != 2)
-		return 0;
-
-	usbi_dbg("found: %s", entry->d_name);
-	if (bus_p != NULL)
-		*bus_p = busnum;
-	if (dev_p != NULL)
-		*dev_p = devnum;
-	return 1;
-}
-
-static int check_usb_vfs(const char *dirname)
-{
-	DIR *dir;
-	struct dirent *entry;
-	int found = 0;
-
-	dir = opendir(dirname);
-	if (!dir)
-		return 0;
-
-	while ((entry = readdir(dir)) != NULL) {
-		if (entry->d_name[0] == '.')
-			continue;
-
-		/* We assume if we find any files that it must be the right place */
-		found = 1;
-		break;
-	}
-
-	closedir(dir);
-	return found;
-}
-
-static const char *find_usbfs_path(void)
-{
-	const char *path = "/dev/bus/usb";
-	const char *ret = NULL;
-
-	if (check_usb_vfs(path)) {
-		ret = path;
-	} else {
-		path = "/proc/bus/usb";
-		if (check_usb_vfs(path))
-			ret = path;
-	}
-
-	/* look for /dev/usbdev*.* if the normal places fail */
-	if (ret == NULL) {
-		struct dirent *entry;
-		DIR *dir;
-
-		path = "/dev";
-		dir = opendir(path);
-		if (dir != NULL) {
-			while ((entry = readdir(dir)) != NULL) {
-				if (_is_usbdev_entry(entry, NULL, NULL)) {
-					/* found one; that's enough */
-					ret = path;
-					usbdev_names = 1;
-					break;
-				}
-			}
-			closedir(dir);
-		}
-	}
-
-	if (ret != NULL)
-		usbi_dbg("found usbfs at %s", ret);
-
-	return ret;
-}
-
-/* the monotonic clock is not usable on all systems (e.g. embedded ones often
- * seem to lack it). fall back to REALTIME if we have to. */
-static clockid_t find_monotonic_clock(void)
-{
-#ifdef CLOCK_MONOTONIC
-	struct timespec ts;
-	int r;
-
-	/* Linux 2.6.28 adds CLOCK_MONOTONIC_RAW but we don't use it
-	 * because it's not available through timerfd */
-	r = clock_gettime(CLOCK_MONOTONIC, &ts);
-	if (r == 0)
-		return CLOCK_MONOTONIC;
-	usbi_dbg("monotonic clock doesn't work, errno %d", errno);
-#endif
-
-	return CLOCK_REALTIME;
-}
-
-static int kernel_version_ge(int major, int minor, int sublevel)
-{
-	struct utsname uts;
-	int atoms, kmajor, kminor, ksublevel;
-
-	if (uname(&uts) < 0)
-		return -1;
-	atoms = sscanf(uts.release, "%d.%d.%d", &kmajor, &kminor, &ksublevel);
-	if (atoms < 1)
-		return -1;
-
-	if (kmajor > major)
-		return 1;
-	if (kmajor < major)
-		return 0;
-
-	/* kmajor == major */
-	if (atoms < 2)
-		return 0 == minor && 0 == sublevel;
-	if (kminor > minor)
-		return 1;
-	if (kminor < minor)
-		return 0;
-
-	/* kminor == minor */
-	if (atoms < 3)
-		return 0 == sublevel;
-
-	return ksublevel >= sublevel;
-}
-
-static int op_init(struct libusb_context *ctx)
-{
-	struct stat statbuf;
-	int r;
-
-	usbfs_path = find_usbfs_path();
-	if (!usbfs_path) {
-		usbi_err(ctx, "could not find usbfs");
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	if (monotonic_clkid == -1)
-		monotonic_clkid = find_monotonic_clock();
-
-	if (supports_flag_bulk_continuation == -1) {
-		/* bulk continuation URB flag available from Linux 2.6.32 */
-		supports_flag_bulk_continuation = kernel_version_ge(2,6,32);
-		if (supports_flag_bulk_continuation == -1) {
-			usbi_err(ctx, "error checking for bulk continuation support");
-			return LIBUSB_ERROR_OTHER;
-		}
-	}
-
-	if (supports_flag_bulk_continuation)
-		usbi_dbg("bulk continuation flag supported");
-
-	if (-1 == supports_flag_zero_packet) {
-		/* zero length packet URB flag fixed since Linux 2.6.31 */
-		supports_flag_zero_packet = kernel_version_ge(2,6,31);
-		if (-1 == supports_flag_zero_packet) {
-			usbi_err(ctx, "error checking for zero length packet support");
-			return LIBUSB_ERROR_OTHER;
-		}
-	}
-
-	if (supports_flag_zero_packet)
-		usbi_dbg("zero length packet flag supported");
-
-	if (-1 == sysfs_has_descriptors) {
-		/* sysfs descriptors has all descriptors since Linux 2.6.26 */
-		sysfs_has_descriptors = kernel_version_ge(2,6,26);
-		if (-1 == sysfs_has_descriptors) {
-			usbi_err(ctx, "error checking for sysfs descriptors");
-			return LIBUSB_ERROR_OTHER;
-		}
-	}
-
-	if (-1 == sysfs_can_relate_devices) {
-		/* sysfs has busnum since Linux 2.6.22 */
-		sysfs_can_relate_devices = kernel_version_ge(2,6,22);
-		if (-1 == sysfs_can_relate_devices) {
-			usbi_err(ctx, "error checking for sysfs busnum");
-			return LIBUSB_ERROR_OTHER;
-		}
-	}
-
-	if (sysfs_can_relate_devices || sysfs_has_descriptors) {
-		r = stat(SYSFS_DEVICE_PATH, &statbuf);
-		if (r != 0 || !S_ISDIR(statbuf.st_mode)) {
-			usbi_warn(ctx, "sysfs not mounted");
-			sysfs_can_relate_devices = 0;
-			sysfs_has_descriptors = 0;
-		}
-	}
-
-	if (sysfs_can_relate_devices)
-		usbi_dbg("sysfs can relate devices");
-
-	if (sysfs_has_descriptors)
-		usbi_dbg("sysfs has complete descriptors");
-
-	usbi_mutex_static_lock(&linux_hotplug_lock);
-	r = LIBUSB_SUCCESS;
-	if (init_count == 0) {
-		/* start up hotplug event handler */
-		r = linux_start_event_monitor();
-	}
-	if (r == LIBUSB_SUCCESS) {
-		r = linux_scan_devices(ctx);
-		if (r == LIBUSB_SUCCESS)
-			init_count++;
-		else if (init_count == 0)
-			linux_stop_event_monitor();
-	} else
-		usbi_err(ctx, "error starting hotplug event monitor");
-	usbi_mutex_static_unlock(&linux_hotplug_lock);
-
-	return r;
-}
-
-static void op_exit(void)
-{
-	usbi_mutex_static_lock(&linux_hotplug_lock);
-	assert(init_count != 0);
-	if (!--init_count) {
-		/* tear down event handler */
-		(void)linux_stop_event_monitor();
-	}
-	usbi_mutex_static_unlock(&linux_hotplug_lock);
-}
-
-static int linux_start_event_monitor(void)
-{
-#if defined(USE_UDEV)
-	return linux_udev_start_event_monitor();
-#else
-	return linux_netlink_start_event_monitor();
-#endif
-}
-
-static int linux_stop_event_monitor(void)
-{
-#if defined(USE_UDEV)
-	return linux_udev_stop_event_monitor();
-#else
-	return linux_netlink_stop_event_monitor();
-#endif
-}
-
-static int linux_scan_devices(struct libusb_context *ctx)
-{
-#if defined(USE_UDEV)
-	return linux_udev_scan_devices(ctx);
-#else
-	return linux_default_scan_devices(ctx);
-#endif
-}
-
-static void op_hotplug_poll(void)
-{
-#if defined(USE_UDEV)
-	linux_udev_hotplug_poll();
-#else
-	linux_netlink_hotplug_poll();
-#endif
-}
-
-static int _open_sysfs_attr(struct libusb_device *dev, const char *attr)
-{
-	struct linux_device_priv *priv = _device_priv(dev);
-	char filename[PATH_MAX];
-	int fd;
-
-	snprintf(filename, PATH_MAX, "%s/%s/%s",
-		SYSFS_DEVICE_PATH, priv->sysfs_dir, attr);
-	fd = open(filename, O_RDONLY);
-	if (fd < 0) {
-		usbi_err(DEVICE_CTX(dev),
-			"open %s failed ret=%d errno=%d", filename, fd, errno);
-		return LIBUSB_ERROR_IO;
-	}
-
-	return fd;
-}
-
-/* Note only suitable for attributes which always read >= 0, < 0 is error */
-static int __read_sysfs_attr(struct libusb_context *ctx,
-	const char *devname, const char *attr)
-{
-	char filename[PATH_MAX];
-	FILE *f;
-	int r, value;
-
-	snprintf(filename, PATH_MAX, "%s/%s/%s", SYSFS_DEVICE_PATH,
-		 devname, attr);
-	f = fopen(filename, "r");
-	if (f == NULL) {
-		if (errno == ENOENT) {
-			/* File doesn't exist. Assume the device has been
-			   disconnected (see trac ticket #70). */
-			return LIBUSB_ERROR_NO_DEVICE;
-		}
-		usbi_err(ctx, "open %s failed errno=%d", filename, errno);
-		return LIBUSB_ERROR_IO;
-	}
-
-	r = fscanf(f, "%d", &value);
-	fclose(f);
-	if (r != 1) {
-		usbi_err(ctx, "fscanf %s returned %d, errno=%d", attr, r, errno);
-		return LIBUSB_ERROR_NO_DEVICE; /* For unplug race (trac #70) */
-	}
-	if (value < 0) {
-		usbi_err(ctx, "%s contains a negative value", filename);
-		return LIBUSB_ERROR_IO;
-	}
-
-	return value;
-}
-
-static int op_get_device_descriptor(struct libusb_device *dev,
-	unsigned char *buffer, int *host_endian)
-{
-	struct linux_device_priv *priv = _device_priv(dev);
-
-	*host_endian = sysfs_has_descriptors ? 0 : 1;
-	memcpy(buffer, priv->descriptors, DEVICE_DESC_LENGTH);
-
-	return 0;
-}
-
-/* read the bConfigurationValue for a device */
-static int sysfs_get_active_config(struct libusb_device *dev, int *config)
-{
-	char *endptr;
-	char tmp[4] = {0, 0, 0, 0};
-	long num;
-	int fd;
-	ssize_t r;
-
-	fd = _open_sysfs_attr(dev, "bConfigurationValue");
-	if (fd < 0)
-		return fd;
-
-	r = read(fd, tmp, sizeof(tmp));
-	close(fd);
-	if (r < 0) {
-		usbi_err(DEVICE_CTX(dev), 
-			"read bConfigurationValue failed ret=%d errno=%d", r, errno);
-		return LIBUSB_ERROR_IO;
-	} else if (r == 0) {
-		usbi_dbg("device unconfigured");
-		*config = -1;
-		return 0;
-	}
-
-	if (tmp[sizeof(tmp) - 1] != 0) {
-		usbi_err(DEVICE_CTX(dev), "not null-terminated?");
-		return LIBUSB_ERROR_IO;
-	} else if (tmp[0] == 0) {
-		usbi_err(DEVICE_CTX(dev), "no configuration value?");
-		return LIBUSB_ERROR_IO;
-	}
-
-	num = strtol(tmp, &endptr, 10);
-	if (endptr == tmp) {
-		usbi_err(DEVICE_CTX(dev), "error converting '%s' to integer", tmp);
-		return LIBUSB_ERROR_IO;
-	}
-
-	*config = (int) num;
-	return 0;
-}
-
-int linux_get_device_address (struct libusb_context *ctx, int detached,
-	uint8_t *busnum, uint8_t *devaddr,const char *dev_node,
-	const char *sys_name)
-{
-	usbi_dbg("getting address for device: %s detached: %d", sys_name, detached);
-	/* can't use sysfs to read the bus and device number if the
-	 * device has been detached */
-	if (!sysfs_can_relate_devices || detached || NULL == sys_name) {
-		if (NULL == dev_node) {
-			return LIBUSB_ERROR_OTHER;
-		}
-
-		/* will this work with all supported kernel versions? */
-		if (!strncmp(dev_node, "/dev/bus/usb", 12)) {
-			sscanf (dev_node, "/dev/bus/usb/%hhd/%hhd", busnum, devaddr);
-		} else if (!strncmp(dev_node, "/proc/bus/usb", 13)) {
-			sscanf (dev_node, "/proc/bus/usb/%hhd/%hhd", busnum, devaddr);
-		}
-
-		return LIBUSB_SUCCESS;
-	}
-
-	usbi_dbg("scan %s", sys_name);
-
-	*busnum = __read_sysfs_attr(ctx, sys_name, "busnum");
-	if (0 > *busnum)
-		return *busnum;
-
-	*devaddr = __read_sysfs_attr(ctx, sys_name, "devnum");
-	if (0 > *devaddr)
-		return *devaddr;
-
-	usbi_dbg("bus=%d dev=%d", *busnum, *devaddr);
-	if (*busnum > 255 || *devaddr > 255)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	return LIBUSB_SUCCESS;
-}
-
-/* Return offset of the next descriptor with the given type */
-static int seek_to_next_descriptor(struct libusb_context *ctx,
-	uint8_t descriptor_type, unsigned char *buffer, int size)
-{
-	struct usb_descriptor_header header;
-	int i;
-
-	for (i = 0; size >= 0; i += header.bLength, size -= header.bLength) {
-		if (size == 0)
-			return LIBUSB_ERROR_NOT_FOUND;
-
-		if (size < 2) {
-			usbi_err(ctx, "short descriptor read %d/2", size);
-			return LIBUSB_ERROR_IO;
-		}
-		usbi_parse_descriptor(buffer + i, "bb", &header, 0);
-
-		if (i && header.bDescriptorType == descriptor_type)
-			return i;
-	}
-	usbi_err(ctx, "bLength overflow by %d bytes", -size);
-	return LIBUSB_ERROR_IO;
-}
-
-/* Return offset to next config */
-static int seek_to_next_config(struct libusb_context *ctx,
-	unsigned char *buffer, int size)
-{
-	struct libusb_config_descriptor config;
-
-	if (size == 0)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	if (size < LIBUSB_DT_CONFIG_SIZE) {
-		usbi_err(ctx, "short descriptor read %d/%d",
-			 size, LIBUSB_DT_CONFIG_SIZE);
-		return LIBUSB_ERROR_IO;
-	}
-
-	usbi_parse_descriptor(buffer, "bbwbbbbb", &config, 0);
-	if (config.bDescriptorType != LIBUSB_DT_CONFIG) {
-		usbi_err(ctx, "descriptor is not a config desc (type 0x%02x)",
-			 config.bDescriptorType);
-		return LIBUSB_ERROR_IO;
-	}
-
-	/*
-	 * In usbfs the config descriptors are config.wTotalLength bytes apart,
-	 * with any short reads from the device appearing as holes in the file.
-	 *
-	 * In sysfs wTotalLength is ignored, instead the kernel returns a
-	 * config descriptor with verified bLength fields, with descriptors
-	 * with an invalid bLength removed.
-	 */
-	if (sysfs_has_descriptors) {
-		int next = seek_to_next_descriptor(ctx, LIBUSB_DT_CONFIG,
-						   buffer, size);
-		if (next == LIBUSB_ERROR_NOT_FOUND)
-			next = size;
-		if (next < 0)
-			return next;
-
-		if (next != config.wTotalLength)
-			usbi_warn(ctx, "config length mismatch wTotalLength "
-				  "%d real %d", config.wTotalLength, next);
-		return next;
-	} else {
-		if (config.wTotalLength < LIBUSB_DT_CONFIG_SIZE) {
-			usbi_err(ctx, "invalid wTotalLength %d",
-				 config.wTotalLength);
-			return LIBUSB_ERROR_IO;
-		} else if (config.wTotalLength > size) {
-			usbi_warn(ctx, "short descriptor read %d/%d",
-				  size, config.wTotalLength);
-			return size;
-		} else
-			return config.wTotalLength;
-	}
-}
-
-static int op_get_config_descriptor_by_value(struct libusb_device *dev,
-	uint8_t value, unsigned char **buffer, int *host_endian)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	struct linux_device_priv *priv = _device_priv(dev);
-	unsigned char *descriptors = priv->descriptors;
-	int size = priv->descriptors_len;
-	struct libusb_config_descriptor *config;
-
-	*buffer = NULL;
-	/* Unlike the device desc. config descs. are always in raw format */
-	*host_endian = 0;
-
-	/* Skip device header */
-	descriptors += DEVICE_DESC_LENGTH;
-	size -= DEVICE_DESC_LENGTH;
-
-	/* Seek till the config is found, or till "EOF" */
-	while (1) {
-		int next = seek_to_next_config(ctx, descriptors, size);
-		if (next < 0)
-			return next;
-		config = (struct libusb_config_descriptor *)descriptors;
-		if (config->bConfigurationValue == value) {
-			*buffer = descriptors;
-			return next;
-		}
-		size -= next;
-		descriptors += next;
-	}
-}
-
-static int op_get_active_config_descriptor(struct libusb_device *dev,
-	unsigned char *buffer, size_t len, int *host_endian)
-{
-	int r, config;
-	unsigned char *config_desc;
-
-	if (sysfs_can_relate_devices) {
-		r = sysfs_get_active_config(dev, &config);
-		if (r < 0)
-			return r;
-	} else {
-		/* Use cached bConfigurationValue */
-		struct linux_device_priv *priv = _device_priv(dev);
-		config = priv->active_config;
-	}
-	if (config == -1)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	r = op_get_config_descriptor_by_value(dev, config, &config_desc,
-					      host_endian);
-	if (r < 0)
-		return r;
-
-	len = MIN(len, r);
-	memcpy(buffer, config_desc, len);
-	return len;
-}
-
-static int op_get_config_descriptor(struct libusb_device *dev,
-	uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
-{
-	struct linux_device_priv *priv = _device_priv(dev);
-	unsigned char *descriptors = priv->descriptors;
-	int i, r, size = priv->descriptors_len;
-
-	/* Unlike the device desc. config descs. are always in raw format */
-	*host_endian = 0;
-
-	/* Skip device header */
-	descriptors += DEVICE_DESC_LENGTH;
-	size -= DEVICE_DESC_LENGTH;
-
-	/* Seek till the config is found, or till "EOF" */
-	for (i = 0; ; i++) {
-		r = seek_to_next_config(DEVICE_CTX(dev), descriptors, size);
-		if (r < 0)
-			return r;
-		if (i == config_index)
-			break;
-		size -= r;
-		descriptors += r;
-	}
-
-	len = MIN(len, r);
-	memcpy(buffer, descriptors, len);
-	return len;
-}
-
-/* send a control message to retrieve active configuration */
-static int usbfs_get_active_config(struct libusb_device *dev, int fd)
-{
-	unsigned char active_config = 0;
-	int r;
-
-	struct usbfs_ctrltransfer ctrl = {
-		.bmRequestType = LIBUSB_ENDPOINT_IN,
-		.bRequest = LIBUSB_REQUEST_GET_CONFIGURATION,
-		.wValue = 0,
-		.wIndex = 0,
-		.wLength = 1,
-		.timeout = 1000,
-		.data = &active_config
-	};
-
-	r = ioctl(fd, IOCTL_USBFS_CONTROL, &ctrl);
-	if (r < 0) {
-		if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		/* we hit this error path frequently with buggy devices :( */
-		usbi_warn(DEVICE_CTX(dev),
-			"get_configuration failed ret=%d errno=%d", r, errno);
-		return LIBUSB_ERROR_IO;
-	}
-
-	return active_config;
-}
-
-static int initialize_device(struct libusb_device *dev, uint8_t busnum,
-	uint8_t devaddr, const char *sysfs_dir)
-{
-	struct linux_device_priv *priv = _device_priv(dev);
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	int descriptors_size = 512; /* Begin with a 1024 byte alloc */
-	int fd, speed;
-	ssize_t r;
-
-	dev->bus_number = busnum;
-	dev->device_address = devaddr;
-
-	if (sysfs_dir) {
-		priv->sysfs_dir = malloc(strlen(sysfs_dir) + 1);
-		if (!priv->sysfs_dir)
-			return LIBUSB_ERROR_NO_MEM;
-		strcpy(priv->sysfs_dir, sysfs_dir);
-
-		/* Note speed can contain 1.5, in this case __read_sysfs_attr
-		   will stop parsing at the '.' and return 1 */
-		speed = __read_sysfs_attr(DEVICE_CTX(dev), sysfs_dir, "speed");
-		if (speed >= 0) {
-			switch (speed) {
-			case     1: dev->speed = LIBUSB_SPEED_LOW; break;
-			case    12: dev->speed = LIBUSB_SPEED_FULL; break;
-			case   480: dev->speed = LIBUSB_SPEED_HIGH; break;
-			case  5000: dev->speed = LIBUSB_SPEED_SUPER; break;
-			default:
-				usbi_warn(DEVICE_CTX(dev), "Unknown device speed: %d Mbps", speed);
-			}
-		}
-	}
-
-	/* cache descriptors in memory */
-	if (sysfs_has_descriptors)
-		fd = _open_sysfs_attr(dev, "descriptors");
-	else
-		fd = _get_usbfs_fd(dev, O_RDONLY, 0);
-	if (fd < 0)
-		return fd;
-
-	do {
-		descriptors_size *= 2;
-		priv->descriptors = usbi_reallocf(priv->descriptors,
-						  descriptors_size);
-		if (!priv->descriptors) {
-			close(fd);
-			return LIBUSB_ERROR_NO_MEM;
-		}
-		/* usbfs has holes in the file */
-		if (!sysfs_has_descriptors) {
-			memset(priv->descriptors + priv->descriptors_len,
-			       0, descriptors_size - priv->descriptors_len);
-		}
-		r = read(fd, priv->descriptors + priv->descriptors_len,
-			 descriptors_size - priv->descriptors_len);
-		if (r < 0) {
-			usbi_err(ctx, "read descriptor failed ret=%d errno=%d",
-				 fd, errno);
-			close(fd);
-			return LIBUSB_ERROR_IO;
-		}
-		priv->descriptors_len += r;
-	} while (priv->descriptors_len == descriptors_size);
-	
-	close(fd);
-
-	if (priv->descriptors_len < DEVICE_DESC_LENGTH) {
-		usbi_err(ctx, "short descriptor read (%d)",
-			 priv->descriptors_len);
-		return LIBUSB_ERROR_IO;
-	}
-
-	if (sysfs_can_relate_devices)
-		return LIBUSB_SUCCESS;
-
-	/* cache active config */
-	fd = _get_usbfs_fd(dev, O_RDWR, 1);
-	if (fd < 0) {
-		/* cannot send a control message to determine the active
-		 * config. just assume the first one is active. */
-		usbi_warn(ctx, "Missing rw usbfs access; cannot determine "
-			       "active configuration descriptor");
-		if (priv->descriptors_len >=
-				(DEVICE_DESC_LENGTH + LIBUSB_DT_CONFIG_SIZE)) {
-			struct libusb_config_descriptor config;
-			usbi_parse_descriptor(
-				priv->descriptors + DEVICE_DESC_LENGTH,
-				"bbwbbbbb", &config, 0);
-			priv->active_config = config.bConfigurationValue;
-		} else
-			priv->active_config = -1; /* No config dt */
-
-		return LIBUSB_SUCCESS;
-	}
-
-	r = usbfs_get_active_config(dev, fd);
-	if (r > 0) {
-		priv->active_config = r;
-		r = LIBUSB_SUCCESS;
-	} else if (r == 0) {
-		/* some buggy devices have a configuration 0, but we're
-		 * reaching into the corner of a corner case here, so let's
-		 * not support buggy devices in these circumstances.
-		 * stick to the specs: a configuration value of 0 means
-		 * unconfigured. */
-		usbi_dbg("active cfg 0? assuming unconfigured device");
-		priv->active_config = -1;
-		r = LIBUSB_SUCCESS;
-	} else if (r == LIBUSB_ERROR_IO) {
-		/* buggy devices sometimes fail to report their active config.
-		 * assume unconfigured and continue the probing */
-		usbi_warn(ctx, "couldn't query active configuration, assuming"
-			       " unconfigured");
-		priv->active_config = -1;
-		r = LIBUSB_SUCCESS;
-	} /* else r < 0, just return the error code */
-
-	close(fd);
-	return r;
-}
-
-static int linux_get_parent_info(struct libusb_device *dev, const char *sysfs_dir)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	struct libusb_device *it;
-	char *parent_sysfs_dir, *tmp;
-	int ret, add_parent = 1;
-
-	/* XXX -- can we figure out the topology when using usbfs? */
-	if (NULL == sysfs_dir || 0 == strncmp(sysfs_dir, "usb", 3)) {
-		/* either using usbfs or finding the parent of a root hub */
-		return LIBUSB_SUCCESS;
-	}
-
-	parent_sysfs_dir = strdup(sysfs_dir);
-	if (NULL != (tmp = strrchr(parent_sysfs_dir, '.')) ||
-	    NULL != (tmp = strrchr(parent_sysfs_dir, '-'))) {
-	        dev->port_number = atoi(tmp + 1);
-		*tmp = '\0';
-	} else {
-		usbi_warn(ctx, "Can not parse sysfs_dir: %s, no parent info",
-			  parent_sysfs_dir);
-		free (parent_sysfs_dir);
-		return LIBUSB_SUCCESS;
-	}
-
-	/* is the parent a root hub? */
-	if (NULL == strchr(parent_sysfs_dir, '-')) {
-		tmp = parent_sysfs_dir;
-		ret = asprintf (&parent_sysfs_dir, "usb%s", tmp);
-		free (tmp);
-		if (0 > ret) {
-			return LIBUSB_ERROR_NO_MEM;
-		}
-	}
-
-retry:
-	/* find the parent in the context */
-	usbi_mutex_lock(&ctx->usb_devs_lock);
-	list_for_each_entry(it, &ctx->usb_devs, list, struct libusb_device) {
-		struct linux_device_priv *priv = _device_priv(it);
-		if (0 == strcmp (priv->sysfs_dir, parent_sysfs_dir)) {
-			dev->parent_dev = libusb_ref_device(it);
-			break;
-		}
-	}
-	usbi_mutex_unlock(&ctx->usb_devs_lock);
-
-	if (!dev->parent_dev && add_parent) {
-		usbi_dbg("parent_dev %s not enumerated yet, enumerating now",
-			 parent_sysfs_dir);
-		sysfs_scan_device(ctx, parent_sysfs_dir);
-		add_parent = 0;
-		goto retry;
-	}
-
-	usbi_dbg("Dev %p (%s) has parent %p (%s) port %d", dev, sysfs_dir,
-		 dev->parent_dev, parent_sysfs_dir, dev->port_number);
-
-	free (parent_sysfs_dir);
-
-	return LIBUSB_SUCCESS;
-}
-
-int linux_enumerate_device(struct libusb_context *ctx,
-	uint8_t busnum, uint8_t devaddr, const char *sysfs_dir)
-{
-	unsigned long session_id;
-	struct libusb_device *dev;
-	int r = 0;
-
-	/* FIXME: session ID is not guaranteed unique as addresses can wrap and
-	 * will be reused. instead we should add a simple sysfs attribute with
-	 * a session ID. */
-	session_id = busnum << 8 | devaddr;
-	usbi_dbg("busnum %d devaddr %d session_id %ld", busnum, devaddr,
-		session_id);
-
-	if (usbi_get_device_by_session_id(ctx, session_id)) {
-		/* device already exists in the context */
-		usbi_dbg("session_id %ld already exists", session_id);
-		return LIBUSB_SUCCESS;
-	}
-
-	usbi_dbg("allocating new device for %d/%d (session %ld)",
-		 busnum, devaddr, session_id);
-	dev = usbi_alloc_device(ctx, session_id);
-	if (!dev)
-		return LIBUSB_ERROR_NO_MEM;
-
-	r = initialize_device(dev, busnum, devaddr, sysfs_dir);
-	if (r < 0)
-		goto out;
-	r = usbi_sanitize_device(dev);
-	if (r < 0)
-		goto out;
-
-	r = linux_get_parent_info(dev, sysfs_dir);
-	if (r < 0)
-		goto out;
-out:
-	if (r < 0)
-		libusb_unref_device(dev);
-	else
-		usbi_connect_device(dev);
-
-	return r;
-}
-
-void linux_hotplug_enumerate(uint8_t busnum, uint8_t devaddr, const char *sys_name)
-{
-	struct libusb_context *ctx;
-
-	usbi_mutex_static_lock(&active_contexts_lock);
-	list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
-		linux_enumerate_device(ctx, busnum, devaddr, sys_name);
-	}
-	usbi_mutex_static_unlock(&active_contexts_lock);
-}
-
-void linux_hotplug_disconnected(uint8_t busnum, uint8_t devaddr, const char *sys_name)
-{
-	struct libusb_context *ctx;
-	struct libusb_device *dev;
-	unsigned long session_id = busnum << 8 | devaddr;
-
-	usbi_mutex_static_lock(&active_contexts_lock);
-	list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
-		dev = usbi_get_device_by_session_id (ctx, session_id);
-		if (NULL != dev) {
-			usbi_disconnect_device (dev);
-		} else {
-			usbi_dbg("device not found for session %x", session_id);
-		}
-	}
-	usbi_mutex_static_unlock(&active_contexts_lock);
-}
-
-#if !defined(USE_UDEV)
-/* open a bus directory and adds all discovered devices to the context */
-static int usbfs_scan_busdir(struct libusb_context *ctx, uint8_t busnum)
-{
-	DIR *dir;
-	char dirpath[PATH_MAX];
-	struct dirent *entry;
-	int r = LIBUSB_ERROR_IO;
-
-	snprintf(dirpath, PATH_MAX, "%s/%03d", usbfs_path, busnum);
-	usbi_dbg("%s", dirpath);
-	dir = opendir(dirpath);
-	if (!dir) {
-		usbi_err(ctx, "opendir '%s' failed, errno=%d", dirpath, errno);
-		/* FIXME: should handle valid race conditions like hub unplugged
-		 * during directory iteration - this is not an error */
-		return r;
-	}
-
-	while ((entry = readdir(dir))) {
-		int devaddr;
-
-		if (entry->d_name[0] == '.')
-			continue;
-
-		devaddr = atoi(entry->d_name);
-		if (devaddr == 0) {
-			usbi_dbg("unknown dir entry %s", entry->d_name);
-			continue;
-		}
-
-		if (linux_enumerate_device(ctx, busnum, (uint8_t) devaddr, NULL)) {
-			usbi_dbg("failed to enumerate dir entry %s", entry->d_name);
-			continue;
-		}
-
-		r = 0;
-	}
-
-	closedir(dir);
-	return r;
-}
-
-static int usbfs_get_device_list(struct libusb_context *ctx)
-{
-	struct dirent *entry;
-	DIR *buses = opendir(usbfs_path);
-	int r = 0;
-
-	if (!buses) {
-		usbi_err(ctx, "opendir buses failed errno=%d", errno);
-		return LIBUSB_ERROR_IO;
-	}
-
-	while ((entry = readdir(buses))) {
-		int busnum;
-
-		if (entry->d_name[0] == '.')
-			continue;
-
-		if (usbdev_names) {
-			int devaddr;
-			if (!_is_usbdev_entry(entry, &busnum, &devaddr))
-				continue;
-
-			r = linux_enumerate_device(ctx, busnum, (uint8_t) devaddr, NULL);
-			if (r < 0) {
-				usbi_dbg("failed to enumerate dir entry %s", entry->d_name);
-				continue;
-			}
-		} else {
-			busnum = atoi(entry->d_name);
-			if (busnum == 0) {
-				usbi_dbg("unknown dir entry %s", entry->d_name);
-				continue;
-			}
-
-			r = usbfs_scan_busdir(ctx, busnum);
-			if (r < 0)
-				break;
-		}
-	}
-
-	closedir(buses);
-	return r;
-
-}
-#endif
-
-static int sysfs_scan_device(struct libusb_context *ctx, const char *devname)
-{
-	uint8_t busnum, devaddr;
-	int ret;
-
-	ret = linux_get_device_address (ctx, 0, &busnum, &devaddr, NULL, devname);
-	if (LIBUSB_SUCCESS != ret) {
-		return ret;
-	}
-
-	return linux_enumerate_device(ctx, busnum & 0xff, devaddr & 0xff,
-		devname);
-}
-
-#if !defined(USE_UDEV)
-static int sysfs_get_device_list(struct libusb_context *ctx)
-{
-	DIR *devices = opendir(SYSFS_DEVICE_PATH);
-	struct dirent *entry;
-	int r = LIBUSB_ERROR_IO;
-
-	if (!devices) {
-		usbi_err(ctx, "opendir devices failed errno=%d", errno);
-		return r;
-	}
-
-	while ((entry = readdir(devices))) {
-		if ((!isdigit(entry->d_name[0]) && strncmp(entry->d_name, "usb", 3))
-				|| strchr(entry->d_name, ':'))
-			continue;
-
-		if (sysfs_scan_device(ctx, entry->d_name)) {
-			usbi_dbg("failed to enumerate dir entry %s", entry->d_name);
-			continue;
-		}
-
-		r = 0;
-	}
-
-	closedir(devices);
-	return r;
-}
-
-static int linux_default_scan_devices (struct libusb_context *ctx)
-{
-	/* we can retrieve device list and descriptors from sysfs or usbfs.
-	 * sysfs is preferable, because if we use usbfs we end up resuming
-	 * any autosuspended USB devices. however, sysfs is not available
-	 * everywhere, so we need a usbfs fallback too.
-	 *
-	 * as described in the "sysfs vs usbfs" comment at the top of this
-	 * file, sometimes we have sysfs but not enough information to
-	 * relate sysfs devices to usbfs nodes.  op_init() determines the
-	 * adequacy of sysfs and sets sysfs_can_relate_devices.
-	 */
-	if (sysfs_can_relate_devices != 0)
-		return sysfs_get_device_list(ctx);
-	else
-		return usbfs_get_device_list(ctx);
-}
-#endif
-
-static int op_open(struct libusb_device_handle *handle)
-{
-	struct linux_device_handle_priv *hpriv = _device_handle_priv(handle);
-	int r;
-
-	hpriv->fd = _get_usbfs_fd(handle->dev, O_RDWR, 0);
-	if (hpriv->fd < 0)
-		return hpriv->fd;
-
-	r = ioctl(hpriv->fd, IOCTL_USBFS_GET_CAPABILITIES, &hpriv->caps);
-	if (r < 0) {
-		if (errno == ENOTTY)
-			usbi_dbg("getcap not available");
-		else
-			usbi_err(HANDLE_CTX(handle), "getcap failed (%d)", errno);
-		hpriv->caps = 0;
-		if (supports_flag_zero_packet)
-			hpriv->caps |= USBFS_CAP_ZERO_PACKET;
-		if (supports_flag_bulk_continuation)
-			hpriv->caps |= USBFS_CAP_BULK_CONTINUATION;
-	}
-
-	return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->fd, POLLOUT);
-}
-
-static void op_close(struct libusb_device_handle *dev_handle)
-{
-	int fd = _device_handle_priv(dev_handle)->fd;
-	usbi_remove_pollfd(HANDLE_CTX(dev_handle), fd);
-	close(fd);
-}
-
-static int op_get_configuration(struct libusb_device_handle *handle,
-	int *config)
-{
-	int r;
-
-	if (sysfs_can_relate_devices) {
-		r = sysfs_get_active_config(handle->dev, config);
-	} else {
-		r = usbfs_get_active_config(handle->dev,
-					    _device_handle_priv(handle)->fd);
-	}
-	if (r < 0)
-		return r;
-
-	if (*config == -1) {
-		usbi_err(HANDLE_CTX(handle), "device unconfigured");
-		*config = 0;
-	}
-
-	return 0;
-}
-
-static int op_set_configuration(struct libusb_device_handle *handle, int config)
-{
-	struct linux_device_priv *priv = _device_priv(handle->dev);
-	int fd = _device_handle_priv(handle)->fd;
-	int r = ioctl(fd, IOCTL_USBFS_SETCONFIG, &config);
-	if (r) {
-		if (errno == EINVAL)
-			return LIBUSB_ERROR_NOT_FOUND;
-		else if (errno == EBUSY)
-			return LIBUSB_ERROR_BUSY;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle), "failed, error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	/* update our cached active config descriptor */
-	priv->active_config = config;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int claim_interface(struct libusb_device_handle *handle, int iface)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	int r = ioctl(fd, IOCTL_USBFS_CLAIMINTF, &iface);
-	if (r) {
-		if (errno == ENOENT)
-			return LIBUSB_ERROR_NOT_FOUND;
-		else if (errno == EBUSY)
-			return LIBUSB_ERROR_BUSY;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle),
-			"claim interface failed, error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-	return 0;
-}
-
-static int release_interface(struct libusb_device_handle *handle, int iface)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	int r = ioctl(fd, IOCTL_USBFS_RELEASEINTF, &iface);
-	if (r) {
-		if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle),
-			"release interface failed, error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-	return 0;
-}
-
-static int op_set_interface(struct libusb_device_handle *handle, int iface,
-	int altsetting)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	struct usbfs_setinterface setintf;
-	int r;
-
-	setintf.interface = iface;
-	setintf.altsetting = altsetting;
-	r = ioctl(fd, IOCTL_USBFS_SETINTF, &setintf);
-	if (r) {
-		if (errno == EINVAL)
-			return LIBUSB_ERROR_NOT_FOUND;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle),
-			"setintf failed error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	return 0;
-}
-
-static int op_clear_halt(struct libusb_device_handle *handle,
-	unsigned char endpoint)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	unsigned int _endpoint = endpoint;
-	int r = ioctl(fd, IOCTL_USBFS_CLEAR_HALT, &_endpoint);
-	if (r) {
-		if (errno == ENOENT)
-			return LIBUSB_ERROR_NOT_FOUND;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle),
-			"clear_halt failed error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	return 0;
-}
-
-static int op_reset_device(struct libusb_device_handle *handle)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	int i, r, ret = 0;
-
-	/* Doing a device reset will cause the usbfs driver to get unbound
-	   from any interfaces it is bound to. By voluntarily unbinding
-	   the usbfs driver ourself, we stop the kernel from rebinding
-	   the interface after reset (which would end up with the interface
-	   getting bound to the in kernel driver if any). */
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
-		if (handle->claimed_interfaces & (1L << i)) {
-			release_interface(handle, i);
-		}
-	}
-
-	usbi_mutex_lock(&handle->lock);
-	r = ioctl(fd, IOCTL_USBFS_RESET, NULL);
-	if (r) {
-		if (errno == ENODEV) {
-			ret = LIBUSB_ERROR_NOT_FOUND;
-			goto out;
-		}
-
-		usbi_err(HANDLE_CTX(handle),
-			"reset failed error %d errno %d", r, errno);
-		ret = LIBUSB_ERROR_OTHER;
-		goto out;
-	}
-
-	/* And re-claim any interfaces which were claimed before the reset */
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
-		if (handle->claimed_interfaces & (1L << i)) {
-			/*
-			 * A driver may have completed modprobing during
-			 * IOCTL_USBFS_RESET, and bound itself as soon as
-			 * IOCTL_USBFS_RESET released the device lock
-			 */
-			r = detach_kernel_driver_and_claim(handle, i);
-			if (r) {
-				usbi_warn(HANDLE_CTX(handle),
-					"failed to re-claim interface %d after reset: %s",
-					i, libusb_error_name(r));
-				handle->claimed_interfaces &= ~(1L << i);
-				ret = LIBUSB_ERROR_NOT_FOUND;
-			}
-		}
-	}
-out:
-	usbi_mutex_unlock(&handle->lock);
-	return ret;
-}
-
-static int op_kernel_driver_active(struct libusb_device_handle *handle,
-	int interface)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	struct usbfs_getdriver getdrv;
-	int r;
-
-	getdrv.interface = interface;
-	r = ioctl(fd, IOCTL_USBFS_GETDRIVER, &getdrv);
-	if (r) {
-		if (errno == ENODATA)
-			return 0;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle),
-			"get driver failed error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	return (strcmp(getdrv.driver, "usbfs") == 0) ? 0 : 1;
-}
-
-static int op_detach_kernel_driver(struct libusb_device_handle *handle,
-	int interface)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	struct usbfs_ioctl command;
-	struct usbfs_getdriver getdrv;
-	int r;
-
-	command.ifno = interface;
-	command.ioctl_code = IOCTL_USBFS_DISCONNECT;
-	command.data = NULL;
-
-	getdrv.interface = interface;
-	r = ioctl(fd, IOCTL_USBFS_GETDRIVER, &getdrv);
-	if (r == 0 && strcmp(getdrv.driver, "usbfs") == 0)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	r = ioctl(fd, IOCTL_USBFS_IOCTL, &command);
-	if (r) {
-		if (errno == ENODATA)
-			return LIBUSB_ERROR_NOT_FOUND;
-		else if (errno == EINVAL)
-			return LIBUSB_ERROR_INVALID_PARAM;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle),
-			"detach failed error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	return 0;
-}
-
-static int op_attach_kernel_driver(struct libusb_device_handle *handle,
-	int interface)
-{
-	int fd = _device_handle_priv(handle)->fd;
-	struct usbfs_ioctl command;
-	int r;
-
-	command.ifno = interface;
-	command.ioctl_code = IOCTL_USBFS_CONNECT;
-	command.data = NULL;
-
-	r = ioctl(fd, IOCTL_USBFS_IOCTL, &command);
-	if (r < 0) {
-		if (errno == ENODATA)
-			return LIBUSB_ERROR_NOT_FOUND;
-		else if (errno == EINVAL)
-			return LIBUSB_ERROR_INVALID_PARAM;
-		else if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-		else if (errno == EBUSY)
-			return LIBUSB_ERROR_BUSY;
-
-		usbi_err(HANDLE_CTX(handle),
-			"attach failed error %d errno %d", r, errno);
-		return LIBUSB_ERROR_OTHER;
-	} else if (r == 0) {
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	return 0;
-}
-
-static int detach_kernel_driver_and_claim(struct libusb_device_handle *handle,
-	int interface)
-{
-	struct usbfs_disconnect_claim dc;
-	int r, fd = _device_handle_priv(handle)->fd;
-
-	dc.interface = interface;
-	strcpy(dc.driver, "usbfs");
-	dc.flags = USBFS_DISCONNECT_CLAIM_EXCEPT_DRIVER;
-	r = ioctl(fd, IOCTL_USBFS_DISCONNECT_CLAIM, &dc);
-	if (r == 0 || (r != 0 && errno != ENOTTY)) {
-		if (r == 0)
-			return 0;
-
-		switch (errno) {
-		case EBUSY:
-			return LIBUSB_ERROR_BUSY;
-		case EINVAL:
-			return LIBUSB_ERROR_INVALID_PARAM;
-		case ENODEV:
-			return LIBUSB_ERROR_NO_DEVICE;
-		}
-		usbi_err(HANDLE_CTX(handle),
-			"disconnect-and-claim failed errno %d", errno);
-		return LIBUSB_ERROR_OTHER;
-	}
-
-	/* Fallback code for kernels which don't support the
-	   disconnect-and-claim ioctl */
-	r = op_detach_kernel_driver(handle, interface);
-	if (r != 0 && r != LIBUSB_ERROR_NOT_FOUND)
-		return r;
-
-	return claim_interface(handle, interface);
-}
-
-static int op_claim_interface(struct libusb_device_handle *handle, int iface)
-{
-	if (handle->auto_detach_kernel_driver)
-		return detach_kernel_driver_and_claim(handle, iface);
-	else
-		return claim_interface(handle, iface);
-}
-
-static int op_release_interface(struct libusb_device_handle *handle, int iface)
-{
-	int r;
-
-	r = release_interface(handle, iface);
-	if (r)
-		return r;
-
-	if (handle->auto_detach_kernel_driver)
-		op_attach_kernel_driver(handle, iface);
-
-	return 0;
-}
-
-static void op_destroy_device(struct libusb_device *dev)
-{
-	struct linux_device_priv *priv = _device_priv(dev);
-	if (priv->descriptors)
-		free(priv->descriptors);
-	if (priv->sysfs_dir)
-		free(priv->sysfs_dir);
-}
-
-/* URBs are discarded in reverse order of submission to avoid races. */
-static int discard_urbs(struct usbi_transfer *itransfer, int first, int last_plus_one)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct linux_transfer_priv *tpriv =
-		usbi_transfer_get_os_priv(itransfer);
-	struct linux_device_handle_priv *dpriv =
-		_device_handle_priv(transfer->dev_handle);
-	int i, ret = 0;
-	struct usbfs_urb *urb;
-
-	for (i = last_plus_one - 1; i >= first; i--) {
-		if (LIBUSB_TRANSFER_TYPE_ISOCHRONOUS == transfer->type)
-			urb = tpriv->iso_urbs[i];
-		else
-			urb = &tpriv->urbs[i];
-
-		if (0 == ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, urb))
-			continue;
-
-		if (EINVAL == errno) {
-			usbi_dbg("URB not found --> assuming ready to be reaped");
-			if (i == (last_plus_one - 1))
-				ret = LIBUSB_ERROR_NOT_FOUND;
-		} else if (ENODEV == errno) {
-			usbi_dbg("Device not found for URB --> assuming ready to be reaped");
-			ret = LIBUSB_ERROR_NO_DEVICE;
-		} else {
-			usbi_warn(TRANSFER_CTX(transfer),
-				"unrecognised discard errno %d", errno);
-			ret = LIBUSB_ERROR_OTHER;
-		}
-	}
-	return ret;
-}
-
-static void free_iso_urbs(struct linux_transfer_priv *tpriv)
-{
-	int i;
-	for (i = 0; i < tpriv->num_urbs; i++) {
-		struct usbfs_urb *urb = tpriv->iso_urbs[i];
-		if (!urb)
-			break;
-		free(urb);
-	}
-
-	free(tpriv->iso_urbs);
-	tpriv->iso_urbs = NULL;
-}
-
-static int submit_bulk_transfer(struct usbi_transfer *itransfer,
-	unsigned char urb_type)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	struct linux_device_handle_priv *dpriv =
-		_device_handle_priv(transfer->dev_handle);
-	struct usbfs_urb *urbs;
-	int is_out = (transfer->endpoint & LIBUSB_ENDPOINT_DIR_MASK)
-		== LIBUSB_ENDPOINT_OUT;
-	int bulk_buffer_len, use_bulk_continuation;
-	int r;
-	int i;
-	size_t alloc_size;
-
-	if (tpriv->urbs)
-		return LIBUSB_ERROR_BUSY;
-
-	if (is_out && (transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) &&
-			!(dpriv->caps & USBFS_CAP_ZERO_PACKET))
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-
-	/*
-	 * Older versions of usbfs place a 16kb limit on bulk URBs. We work
-	 * around this by splitting large transfers into 16k blocks, and then
-	 * submit all urbs at once. it would be simpler to submit one urb at
-	 * a time, but there is a big performance gain doing it this way.
-	 *
-	 * Newer versions lift the 16k limit (USBFS_CAP_NO_PACKET_SIZE_LIM),
-	 * using arbritary large transfers can still be a bad idea though, as
-	 * the kernel needs to allocate physical contiguous memory for this,
-	 * which may fail for large buffers.
-	 *
-	 * The kernel solves this problem by splitting the transfer into
-	 * blocks itself when the host-controller is scatter-gather capable
-	 * (USBFS_CAP_BULK_SCATTER_GATHER), which most controllers are.
-	 *
-	 * Last, there is the issue of short-transfers when splitting, for
-	 * short split-transfers to work reliable USBFS_CAP_BULK_CONTINUATION
-	 * is needed, but this is not always available.
-	 */
-	if (dpriv->caps & USBFS_CAP_BULK_SCATTER_GATHER) {
-		/* Good! Just submit everything in one go */
-		bulk_buffer_len = transfer->length ? transfer->length : 1;
-		use_bulk_continuation = 0;
-	} else if (dpriv->caps & USBFS_CAP_BULK_CONTINUATION) {
-		/* Split the transfers and use bulk-continuation to
-		   avoid issues with short-transfers */
-		bulk_buffer_len = MAX_BULK_BUFFER_LENGTH;
-		use_bulk_continuation = 1;
-	} else if (dpriv->caps & USBFS_CAP_NO_PACKET_SIZE_LIM) {
-		/* Don't split, assume the kernel can alloc the buffer
-		   (otherwise the submit will fail with -ENOMEM) */
-		bulk_buffer_len = transfer->length ? transfer->length : 1;
-		use_bulk_continuation = 0;
-	} else {
-		/* Bad, splitting without bulk-continuation, short transfers
-		   which end before the last urb will not work reliable! */
-		/* Note we don't warn here as this is "normal" on kernels <
-		   2.6.32 and not a problem for most applications */
-		bulk_buffer_len = MAX_BULK_BUFFER_LENGTH;
-		use_bulk_continuation = 0;
-	}
-
-	int num_urbs = transfer->length / bulk_buffer_len;
-	int last_urb_partial = 0;
-
-	if (transfer->length == 0) {
-		num_urbs = 1;
-	} else if ((transfer->length % bulk_buffer_len) > 0) {
-		last_urb_partial = 1;
-		num_urbs++;
-	}
-	usbi_dbg("need %d urbs for new transfer with length %d", num_urbs,
-		transfer->length);
-	alloc_size = num_urbs * sizeof(struct usbfs_urb);
-	urbs = calloc(1, alloc_size);
-	if (!urbs)
-		return LIBUSB_ERROR_NO_MEM;
-	tpriv->urbs = urbs;
-	tpriv->num_urbs = num_urbs;
-	tpriv->num_retired = 0;
-	tpriv->reap_action = NORMAL;
-	tpriv->reap_status = LIBUSB_TRANSFER_COMPLETED;
-
-	for (i = 0; i < num_urbs; i++) {
-		struct usbfs_urb *urb = &urbs[i];
-		urb->usercontext = itransfer;
-		urb->type = urb_type;
-		urb->endpoint = transfer->endpoint;
-		urb->buffer = transfer->buffer + (i * bulk_buffer_len);
-		/* don't set the short not ok flag for the last URB */
-		if (use_bulk_continuation && !is_out && (i < num_urbs - 1))
-			urb->flags = USBFS_URB_SHORT_NOT_OK;
-		if (i == num_urbs - 1 && last_urb_partial)
-			urb->buffer_length = transfer->length % bulk_buffer_len;
-		else if (transfer->length == 0)
-			urb->buffer_length = 0;
-		else
-			urb->buffer_length = bulk_buffer_len;
-
-		if (i > 0 && use_bulk_continuation)
-			urb->flags |= USBFS_URB_BULK_CONTINUATION;
-
-		/* we have already checked that the flag is supported */
-		if (is_out && i == num_urbs - 1 &&
-		    transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET)
-			urb->flags |= USBFS_URB_ZERO_PACKET;
-
-		r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
-		if (r < 0) {
-			if (errno == ENODEV) {
-				r = LIBUSB_ERROR_NO_DEVICE;
-			} else {
-				usbi_err(TRANSFER_CTX(transfer),
-					"submiturb failed error %d errno=%d", r, errno);
-				r = LIBUSB_ERROR_IO;
-			}
-	
-			/* if the first URB submission fails, we can simply free up and
-			 * return failure immediately. */
-			if (i == 0) {
-				usbi_dbg("first URB failed, easy peasy");
-				free(urbs);
-				tpriv->urbs = NULL;
-				return r;
-			}
-
-			/* if it's not the first URB that failed, the situation is a bit
-			 * tricky. we may need to discard all previous URBs. there are
-			 * complications:
-			 *  - discarding is asynchronous - discarded urbs will be reaped
-			 *    later. the user must not have freed the transfer when the
-			 *    discarded URBs are reaped, otherwise libusbx will be using
-			 *    freed memory.
-			 *  - the earlier URBs may have completed successfully and we do
-			 *    not want to throw away any data.
-			 *  - this URB failing may be no error; EREMOTEIO means that
-			 *    this transfer simply didn't need all the URBs we submitted
-			 * so, we report that the transfer was submitted successfully and
-			 * in case of error we discard all previous URBs. later when
-			 * the final reap completes we can report error to the user,
-			 * or success if an earlier URB was completed successfully.
-			 */
-			tpriv->reap_action = EREMOTEIO == errno ? COMPLETED_EARLY : SUBMIT_FAILED;
-
-			/* The URBs we haven't submitted yet we count as already
-			 * retired. */
-			tpriv->num_retired += num_urbs - i;
-
-			/* If we completed short then don't try to discard. */
-			if (COMPLETED_EARLY == tpriv->reap_action)
-				return 0;
-
-			discard_urbs(itransfer, 0, i);
-
-			usbi_dbg("reporting successful submission but waiting for %d "
-				"discards before reporting error", i);
-			return 0;
-		}
-	}
-
-	return 0;
-}
-
-static int submit_iso_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	struct linux_device_handle_priv *dpriv =
-		_device_handle_priv(transfer->dev_handle);
-	struct usbfs_urb **urbs;
-	size_t alloc_size;
-	int num_packets = transfer->num_iso_packets;
-	int i;
-	int this_urb_len = 0;
-	int num_urbs = 1;
-	int packet_offset = 0;
-	unsigned int packet_len;
-	unsigned char *urb_buffer = transfer->buffer;
-
-	if (tpriv->iso_urbs)
-		return LIBUSB_ERROR_BUSY;
-
-	/* usbfs places a 32kb limit on iso URBs. we divide up larger requests
-	 * into smaller units to meet such restriction, then fire off all the
-	 * units at once. it would be simpler if we just fired one unit at a time,
-	 * but there is a big performance gain through doing it this way.
-	 *
-	 * Newer kernels lift the 32k limit (USBFS_CAP_NO_PACKET_SIZE_LIM),
-	 * using arbritary large transfers is still be a bad idea though, as
-	 * the kernel needs to allocate physical contiguous memory for this,
-	 * which may fail for large buffers.
-	 */
-
-	/* calculate how many URBs we need */
-	for (i = 0; i < num_packets; i++) {
-		unsigned int space_remaining = MAX_ISO_BUFFER_LENGTH - this_urb_len;
-		packet_len = transfer->iso_packet_desc[i].length;
-
-		if (packet_len > space_remaining) {
-			num_urbs++;
-			this_urb_len = packet_len;
-		} else {
-			this_urb_len += packet_len;
-		}
-	}
-	usbi_dbg("need %d 32k URBs for transfer", num_urbs);
-
-	alloc_size = num_urbs * sizeof(*urbs);
-	urbs = calloc(1, alloc_size);
-	if (!urbs)
-		return LIBUSB_ERROR_NO_MEM;
-
-	tpriv->iso_urbs = urbs;
-	tpriv->num_urbs = num_urbs;
-	tpriv->num_retired = 0;
-	tpriv->reap_action = NORMAL;
-	tpriv->iso_packet_offset = 0;
-
-	/* allocate + initialize each URB with the correct number of packets */
-	for (i = 0; i < num_urbs; i++) {
-		struct usbfs_urb *urb;
-		unsigned int space_remaining_in_urb = MAX_ISO_BUFFER_LENGTH;
-		int urb_packet_offset = 0;
-		unsigned char *urb_buffer_orig = urb_buffer;
-		int j;
-		int k;
-
-		/* swallow up all the packets we can fit into this URB */
-		while (packet_offset < transfer->num_iso_packets) {
-			packet_len = transfer->iso_packet_desc[packet_offset].length;
-			if (packet_len <= space_remaining_in_urb) {
-				/* throw it in */
-				urb_packet_offset++;
-				packet_offset++;
-				space_remaining_in_urb -= packet_len;
-				urb_buffer += packet_len;
-			} else {
-				/* it can't fit, save it for the next URB */
-				break;
-			}
-		}
-
-		alloc_size = sizeof(*urb)
-			+ (urb_packet_offset * sizeof(struct usbfs_iso_packet_desc));
-		urb = calloc(1, alloc_size);
-		if (!urb) {
-			free_iso_urbs(tpriv);
-			return LIBUSB_ERROR_NO_MEM;
-		}
-		urbs[i] = urb;
-
-		/* populate packet lengths */
-		for (j = 0, k = packet_offset - urb_packet_offset;
-				k < packet_offset; k++, j++) {
-			packet_len = transfer->iso_packet_desc[k].length;
-			urb->iso_frame_desc[j].length = packet_len;
-		}
-
-		urb->usercontext = itransfer;
-		urb->type = USBFS_URB_TYPE_ISO;
-		/* FIXME: interface for non-ASAP data? */
-		urb->flags = USBFS_URB_ISO_ASAP;
-		urb->endpoint = transfer->endpoint;
-		urb->number_of_packets = urb_packet_offset;
-		urb->buffer = urb_buffer_orig;
-	}
-
-	/* submit URBs */
-	for (i = 0; i < num_urbs; i++) {
-		int r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urbs[i]);
-		if (r < 0) {
-			if (errno == ENODEV) {
-				r = LIBUSB_ERROR_NO_DEVICE;
-			} else {
-				usbi_err(TRANSFER_CTX(transfer),
-					"submiturb failed error %d errno=%d", r, errno);
-				r = LIBUSB_ERROR_IO;
-			}
-
-			/* if the first URB submission fails, we can simply free up and
-			 * return failure immediately. */
-			if (i == 0) {
-				usbi_dbg("first URB failed, easy peasy");
-				free_iso_urbs(tpriv);
-				return r;
-			}
-
-			/* if it's not the first URB that failed, the situation is a bit
-			 * tricky. we must discard all previous URBs. there are
-			 * complications:
-			 *  - discarding is asynchronous - discarded urbs will be reaped
-			 *    later. the user must not have freed the transfer when the
-			 *    discarded URBs are reaped, otherwise libusbx will be using
-			 *    freed memory.
-			 *  - the earlier URBs may have completed successfully and we do
-			 *    not want to throw away any data.
-			 * so, in this case we discard all the previous URBs BUT we report
-			 * that the transfer was submitted successfully. then later when
-			 * the final discard completes we can report error to the user.
-			 */
-			tpriv->reap_action = SUBMIT_FAILED;
-
-			/* The URBs we haven't submitted yet we count as already
-			 * retired. */
-			tpriv->num_retired = num_urbs - i;
-			discard_urbs(itransfer, 0, i);
-
-			usbi_dbg("reporting successful submission but waiting for %d "
-				"discards before reporting error", i);
-			return 0;
-		}
-	}
-
-	return 0;
-}
-
-static int submit_control_transfer(struct usbi_transfer *itransfer)
-{
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct linux_device_handle_priv *dpriv =
-		_device_handle_priv(transfer->dev_handle);
-	struct usbfs_urb *urb;
-	int r;
-
-	if (tpriv->urbs)
-		return LIBUSB_ERROR_BUSY;
-
-	if (transfer->length - LIBUSB_CONTROL_SETUP_SIZE > MAX_CTRL_BUFFER_LENGTH)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	urb = calloc(1, sizeof(struct usbfs_urb));
-	if (!urb)
-		return LIBUSB_ERROR_NO_MEM;
-	tpriv->urbs = urb;
-	tpriv->num_urbs = 1;
-	tpriv->reap_action = NORMAL;
-
-	urb->usercontext = itransfer;
-	urb->type = USBFS_URB_TYPE_CONTROL;
-	urb->endpoint = transfer->endpoint;
-	urb->buffer = transfer->buffer;
-	urb->buffer_length = transfer->length;
-
-	r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
-	if (r < 0) {
-		free(urb);
-		tpriv->urbs = NULL;
-		if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(TRANSFER_CTX(transfer),
-			"submiturb failed error %d errno=%d", r, errno);
-		return LIBUSB_ERROR_IO;
-	}
-	return 0;
-}
-
-static int op_submit_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-		return submit_control_transfer(itransfer);
-	case LIBUSB_TRANSFER_TYPE_BULK:
-		return submit_bulk_transfer(itransfer, USBFS_URB_TYPE_BULK);
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-		return submit_bulk_transfer(itransfer, USBFS_URB_TYPE_INTERRUPT);
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		return submit_iso_transfer(itransfer);
-	default:
-		usbi_err(TRANSFER_CTX(transfer),
-			"unknown endpoint type %d", transfer->type);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-}
-
-static int op_cancel_transfer(struct usbi_transfer *itransfer)
-{
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_BULK:
-		if (tpriv->reap_action == ERROR)
-			break;
-		/* else, fall through */
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		tpriv->reap_action = CANCELLED;
-		break;
-	default:
-		usbi_err(TRANSFER_CTX(transfer),
-			"unknown endpoint type %d", transfer->type);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	if (!tpriv->urbs)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	return discard_urbs(itransfer, 0, tpriv->num_urbs);
-}
-
-static void op_clear_transfer_priv(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-
-	/* urbs can be freed also in submit_transfer so lock mutex first */
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-		usbi_mutex_lock(&itransfer->lock);
-		if (tpriv->urbs)
-			free(tpriv->urbs);
-		tpriv->urbs = NULL;
-		usbi_mutex_unlock(&itransfer->lock);
-		break;
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		usbi_mutex_lock(&itransfer->lock);
-		if (tpriv->iso_urbs)
-			free_iso_urbs(tpriv);
-		usbi_mutex_unlock(&itransfer->lock);
-		break;
-	default:
-		usbi_err(TRANSFER_CTX(transfer),
-			"unknown endpoint type %d", transfer->type);
-	}
-}
-
-static int handle_bulk_completion(struct usbi_transfer *itransfer,
-	struct usbfs_urb *urb)
-{
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	int urb_idx = urb - tpriv->urbs;
-
-	usbi_mutex_lock(&itransfer->lock);
-	usbi_dbg("handling completion status %d of bulk urb %d/%d", urb->status,
-		urb_idx + 1, tpriv->num_urbs);
-
-	tpriv->num_retired++;
-
-	if (tpriv->reap_action != NORMAL) {
-		/* cancelled, submit_fail, or completed early */
-		usbi_dbg("abnormal reap: urb status %d", urb->status);
-
-		/* even though we're in the process of cancelling, it's possible that
-		 * we may receive some data in these URBs that we don't want to lose.
-		 * examples:
-		 * 1. while the kernel is cancelling all the packets that make up an
-		 *    URB, a few of them might complete. so we get back a successful
-		 *    cancellation *and* some data.
-		 * 2. we receive a short URB which marks the early completion condition,
-		 *    so we start cancelling the remaining URBs. however, we're too
-		 *    slow and another URB completes (or at least completes partially).
-		 *    (this can't happen since we always use BULK_CONTINUATION.)
-		 *
-		 * When this happens, our objectives are not to lose any "surplus" data,
-		 * and also to stick it at the end of the previously-received data
-		 * (closing any holes), so that libusbx reports the total amount of
-		 * transferred data and presents it in a contiguous chunk.
-		 */
-		if (urb->actual_length > 0) {
-			unsigned char *target = transfer->buffer + itransfer->transferred;
-			usbi_dbg("received %d bytes of surplus data", urb->actual_length);
-			if (urb->buffer != target) {
-				usbi_dbg("moving surplus data from offset %d to offset %d",
-					(unsigned char *) urb->buffer - transfer->buffer,
-					target - transfer->buffer);
-				memmove(target, urb->buffer, urb->actual_length);
-			}
-			itransfer->transferred += urb->actual_length;
-		}
-
-		if (tpriv->num_retired == tpriv->num_urbs) {
-			usbi_dbg("abnormal reap: last URB handled, reporting");
-			if (tpriv->reap_action != COMPLETED_EARLY &&
-			    tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
-				tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
-			goto completed;
-		}
-		goto out_unlock;
-	}
-
-	itransfer->transferred += urb->actual_length;
-
-	/* Many of these errors can occur on *any* urb of a multi-urb
-	 * transfer.  When they do, we tear down the rest of the transfer.
-	 */
-	switch (urb->status) {
-	case 0:
-		break;
-	case -EREMOTEIO: /* short transfer */
-		break;
-	case -ENOENT: /* cancelled */
-	case -ECONNRESET:
-		break;
-	case -ENODEV:
-	case -ESHUTDOWN:
-		usbi_dbg("device removed");
-		tpriv->reap_status = LIBUSB_TRANSFER_NO_DEVICE;
-		goto cancel_remaining;
-	case -EPIPE:
-		usbi_dbg("detected endpoint stall");
-		if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
-			tpriv->reap_status = LIBUSB_TRANSFER_STALL;
-		goto cancel_remaining;
-	case -EOVERFLOW:
-		/* overflow can only ever occur in the last urb */
-		usbi_dbg("overflow, actual_length=%d", urb->actual_length);
-		if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
-			tpriv->reap_status = LIBUSB_TRANSFER_OVERFLOW;
-		goto completed;
-	case -ETIME:
-	case -EPROTO:
-	case -EILSEQ:
-	case -ECOMM:
-	case -ENOSR:
-		usbi_dbg("low level error %d", urb->status);
-		tpriv->reap_action = ERROR;
-		goto cancel_remaining;
-	default:
-		usbi_warn(ITRANSFER_CTX(itransfer),
-			"unrecognised urb status %d", urb->status);
-		tpriv->reap_action = ERROR;
-		goto cancel_remaining;
-	}
-
-	/* if we're the last urb or we got less data than requested then we're
-	 * done */
-	if (urb_idx == tpriv->num_urbs - 1) {
-		usbi_dbg("last URB in transfer --> complete!");
-		goto completed;
-	} else if (urb->actual_length < urb->buffer_length) {
-		usbi_dbg("short transfer %d/%d --> complete!",
-			urb->actual_length, urb->buffer_length);
-		if (tpriv->reap_action == NORMAL)
-			tpriv->reap_action = COMPLETED_EARLY;
-	} else
-		goto out_unlock;
-
-cancel_remaining:
-	if (ERROR == tpriv->reap_action && LIBUSB_TRANSFER_COMPLETED == tpriv->reap_status)
-		tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
-
-	if (tpriv->num_retired == tpriv->num_urbs) /* nothing to cancel */
-		goto completed;
-
-	/* cancel remaining urbs and wait for their completion before
-	 * reporting results */
-	discard_urbs(itransfer, urb_idx + 1, tpriv->num_urbs);
-
-out_unlock:
-	usbi_mutex_unlock(&itransfer->lock);
-	return 0;
-
-completed:
-	free(tpriv->urbs);
-	tpriv->urbs = NULL;
-	usbi_mutex_unlock(&itransfer->lock);
-	return CANCELLED == tpriv->reap_action ?
-		usbi_handle_transfer_cancellation(itransfer) :
-		usbi_handle_transfer_completion(itransfer, tpriv->reap_status);
-}
-
-static int handle_iso_completion(struct usbi_transfer *itransfer,
-	struct usbfs_urb *urb)
-{
-	struct libusb_transfer *transfer =
-		USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	int num_urbs = tpriv->num_urbs;
-	int urb_idx = 0;
-	int i;
-	enum libusb_transfer_status status = LIBUSB_TRANSFER_COMPLETED;
-
-	usbi_mutex_lock(&itransfer->lock);
-	for (i = 0; i < num_urbs; i++) {
-		if (urb == tpriv->iso_urbs[i]) {
-			urb_idx = i + 1;
-			break;
-		}
-	}
-	if (urb_idx == 0) {
-		usbi_err(TRANSFER_CTX(transfer), "could not locate urb!");
-		usbi_mutex_unlock(&itransfer->lock);
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	usbi_dbg("handling completion status %d of iso urb %d/%d", urb->status,
-		urb_idx, num_urbs);
-
-	/* copy isochronous results back in */
-
-	for (i = 0; i < urb->number_of_packets; i++) {
-		struct usbfs_iso_packet_desc *urb_desc = &urb->iso_frame_desc[i];
-		struct libusb_iso_packet_descriptor *lib_desc =
-			&transfer->iso_packet_desc[tpriv->iso_packet_offset++];
-		lib_desc->status = LIBUSB_TRANSFER_COMPLETED;
-		switch (urb_desc->status) {
-		case 0:
-			break;
-		case -ENOENT: /* cancelled */
-		case -ECONNRESET:
-			break;
-		case -ENODEV:
-		case -ESHUTDOWN:
-			usbi_dbg("device removed");
-			lib_desc->status = LIBUSB_TRANSFER_NO_DEVICE;
-			break;
-		case -EPIPE:
-			usbi_dbg("detected endpoint stall");
-			lib_desc->status = LIBUSB_TRANSFER_STALL;
-			break;
-		case -EOVERFLOW:
-			usbi_dbg("overflow error");
-			lib_desc->status = LIBUSB_TRANSFER_OVERFLOW;
-			break;
-		case -ETIME:
-		case -EPROTO:
-		case -EILSEQ:
-		case -ECOMM:
-		case -ENOSR:
-		case -EXDEV:
-			usbi_dbg("low-level USB error %d", urb_desc->status);
-			lib_desc->status = LIBUSB_TRANSFER_ERROR;
-			break;
-		default:
-			usbi_warn(TRANSFER_CTX(transfer),
-				"unrecognised urb status %d", urb_desc->status);
-			lib_desc->status = LIBUSB_TRANSFER_ERROR;
-			break;
-		}
-		lib_desc->actual_length = urb_desc->actual_length;
-	}
-
-	tpriv->num_retired++;
-
-	if (tpriv->reap_action != NORMAL) { /* cancelled or submit_fail */
-		usbi_dbg("CANCEL: urb status %d", urb->status);
-
-		if (tpriv->num_retired == num_urbs) {
-			usbi_dbg("CANCEL: last URB handled, reporting");
-			free_iso_urbs(tpriv);
-			if (tpriv->reap_action == CANCELLED) {
-				usbi_mutex_unlock(&itransfer->lock);
-				return usbi_handle_transfer_cancellation(itransfer);
-			} else {
-				usbi_mutex_unlock(&itransfer->lock);
-				return usbi_handle_transfer_completion(itransfer,
-					LIBUSB_TRANSFER_ERROR);
-			}
-		}
-		goto out;
-	}
-
-	switch (urb->status) {
-	case 0:
-		break;
-	case -ENOENT: /* cancelled */
-	case -ECONNRESET:
-		break;
-	case -ESHUTDOWN:
-		usbi_dbg("device removed");
-		status = LIBUSB_TRANSFER_NO_DEVICE;
-		break;
-	default:
-		usbi_warn(TRANSFER_CTX(transfer),
-			"unrecognised urb status %d", urb->status);
-		status = LIBUSB_TRANSFER_ERROR;
-		break;
-	}
-
-	/* if we're the last urb then we're done */
-	if (urb_idx == num_urbs) {
-		usbi_dbg("last URB in transfer --> complete!");
-		free_iso_urbs(tpriv);
-		usbi_mutex_unlock(&itransfer->lock);
-		return usbi_handle_transfer_completion(itransfer, status);
-	}
-
-out:
-	usbi_mutex_unlock(&itransfer->lock);
-	return 0;
-}
-
-static int handle_control_completion(struct usbi_transfer *itransfer,
-	struct usbfs_urb *urb)
-{
-	struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-	int status;
-
-	usbi_mutex_lock(&itransfer->lock);
-	usbi_dbg("handling completion status %d", urb->status);
-
-	itransfer->transferred += urb->actual_length;
-
-	if (tpriv->reap_action == CANCELLED) {
-		if (urb->status != 0 && urb->status != -ENOENT)
-			usbi_warn(ITRANSFER_CTX(itransfer),
-				"cancel: unrecognised urb status %d", urb->status);
-		free(tpriv->urbs);
-		tpriv->urbs = NULL;
-		usbi_mutex_unlock(&itransfer->lock);
-		return usbi_handle_transfer_cancellation(itransfer);
-	}
-
-	switch (urb->status) {
-	case 0:
-		status = LIBUSB_TRANSFER_COMPLETED;
-		break;
-	case -ENOENT: /* cancelled */
-		status = LIBUSB_TRANSFER_CANCELLED;
-		break;
-	case -ENODEV:
-	case -ESHUTDOWN:
-		usbi_dbg("device removed");
-		status = LIBUSB_TRANSFER_NO_DEVICE;
-		break;
-	case -EPIPE:
-		usbi_dbg("unsupported control request");
-		status = LIBUSB_TRANSFER_STALL;
-		break;
-	case -EOVERFLOW:
-		usbi_dbg("control overflow error");
-		status = LIBUSB_TRANSFER_OVERFLOW;
-		break;
-	case -ETIME:
-	case -EPROTO:
-	case -EILSEQ:
-	case -ECOMM:
-	case -ENOSR:
-		usbi_dbg("low-level bus error occurred");
-		status = LIBUSB_TRANSFER_ERROR;
-		break;
-	default:
-		usbi_warn(ITRANSFER_CTX(itransfer),
-			"unrecognised urb status %d", urb->status);
-		status = LIBUSB_TRANSFER_ERROR;
-		break;
-	}
-
-	free(tpriv->urbs);
-	tpriv->urbs = NULL;
-	usbi_mutex_unlock(&itransfer->lock);
-	return usbi_handle_transfer_completion(itransfer, status);
-}
-
-static int reap_for_handle(struct libusb_device_handle *handle)
-{
-	struct linux_device_handle_priv *hpriv = _device_handle_priv(handle);
-	int r;
-	struct usbfs_urb *urb;
-	struct usbi_transfer *itransfer;
-	struct libusb_transfer *transfer;
-
-	r = ioctl(hpriv->fd, IOCTL_USBFS_REAPURBNDELAY, &urb);
-	if (r == -1 && errno == EAGAIN)
-		return 1;
-	if (r < 0) {
-		if (errno == ENODEV)
-			return LIBUSB_ERROR_NO_DEVICE;
-
-		usbi_err(HANDLE_CTX(handle), "reap failed error %d errno=%d",
-			r, errno);
-		return LIBUSB_ERROR_IO;
-	}
-
-	itransfer = urb->usercontext;
-	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	usbi_dbg("urb type=%d status=%d transferred=%d", urb->type, urb->status,
-		urb->actual_length);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		return handle_iso_completion(itransfer, urb);
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-		return handle_bulk_completion(itransfer, urb);
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-		return handle_control_completion(itransfer, urb);
-	default:
-		usbi_err(HANDLE_CTX(handle), "unrecognised endpoint type %x",
-			transfer->type);
-		return LIBUSB_ERROR_OTHER;
-	}
-}
-
-static int op_handle_events(struct libusb_context *ctx,
-	struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
-{
-	int r;
-	unsigned int i = 0;
-
-	usbi_mutex_lock(&ctx->open_devs_lock);
-	for (i = 0; i < nfds && num_ready > 0; i++) {
-		struct pollfd *pollfd = &fds[i];
-		struct libusb_device_handle *handle;
-		struct linux_device_handle_priv *hpriv = NULL;
-
-		if (!pollfd->revents)
-			continue;
-
-		num_ready--;
-		list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
-			hpriv = _device_handle_priv(handle);
-			if (hpriv->fd == pollfd->fd)
-				break;
-		}
-
-		if (pollfd->revents & POLLERR) {
-			usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->fd);
-			usbi_handle_disconnect(handle);
-			continue;
-		}
-
-		do {
-			r = reap_for_handle(handle);
-		} while (r == 0);
-		if (r == 1 || r == LIBUSB_ERROR_NO_DEVICE)
-			continue;
-		else if (r < 0)
-			goto out;
-	}
-
-	r = 0;
-out:
-	usbi_mutex_unlock(&ctx->open_devs_lock);
-	return r;
-}
-
-static int op_clock_gettime(int clk_id, struct timespec *tp)
-{
-	switch (clk_id) {
-	case USBI_CLOCK_MONOTONIC:
-		return clock_gettime(monotonic_clkid, tp);
-	case USBI_CLOCK_REALTIME:
-		return clock_gettime(CLOCK_REALTIME, tp);
-	default:
-		return LIBUSB_ERROR_INVALID_PARAM;
-  }
-}
-
-#ifdef USBI_TIMERFD_AVAILABLE
-static clockid_t op_get_timerfd_clockid(void)
-{
-	return monotonic_clkid;
-
-}
-#endif
-
-const struct usbi_os_backend linux_usbfs_backend = {
-	.name = "Linux usbfs",
-	.caps = USBI_CAP_HAS_HID_ACCESS|USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER,
-	.init = op_init,
-	.exit = op_exit,
-	.get_device_list = NULL,
-	.hotplug_poll = op_hotplug_poll,
-	.get_device_descriptor = op_get_device_descriptor,
-	.get_active_config_descriptor = op_get_active_config_descriptor,
-	.get_config_descriptor = op_get_config_descriptor,
-	.get_config_descriptor_by_value = op_get_config_descriptor_by_value,
-
-	.open = op_open,
-	.close = op_close,
-	.get_configuration = op_get_configuration,
-	.set_configuration = op_set_configuration,
-	.claim_interface = op_claim_interface,
-	.release_interface = op_release_interface,
-
-	.set_interface_altsetting = op_set_interface,
-	.clear_halt = op_clear_halt,
-	.reset_device = op_reset_device,
-
-	.kernel_driver_active = op_kernel_driver_active,
-	.detach_kernel_driver = op_detach_kernel_driver,
-	.attach_kernel_driver = op_attach_kernel_driver,
-
-	.destroy_device = op_destroy_device,
-
-	.submit_transfer = op_submit_transfer,
-	.cancel_transfer = op_cancel_transfer,
-	.clear_transfer_priv = op_clear_transfer_priv,
-
-	.handle_events = op_handle_events,
-
-	.clock_gettime = op_clock_gettime,
-
-#ifdef USBI_TIMERFD_AVAILABLE
-	.get_timerfd_clockid = op_get_timerfd_clockid,
-#endif
-
-	.device_priv_size = sizeof(struct linux_device_priv),
-	.device_handle_priv_size = sizeof(struct linux_device_handle_priv),
-	.transfer_priv_size = sizeof(struct linux_transfer_priv),
-	.add_iso_packet_size = 0,
-};
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_usbfs.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_usbfs.h
deleted file mode 100644
index 499bab78e8..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/linux_usbfs.h
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * usbfs header structures
- * Copyright © 2007 Daniel Drake <dsd@gentoo.org>
- * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef LIBUSB_USBFS_H
-#define LIBUSB_USBFS_H
-
-#include <linux/types.h>
-
-#define SYSFS_DEVICE_PATH "/sys/bus/usb/devices"
-
-struct usbfs_ctrltransfer {
-	/* keep in sync with usbdevice_fs.h:usbdevfs_ctrltransfer */
-	uint8_t  bmRequestType;
-	uint8_t  bRequest;
-	uint16_t wValue;
-	uint16_t wIndex;
-	uint16_t wLength;
-
-	uint32_t timeout;	/* in milliseconds */
-
-	/* pointer to data */
-	void *data;
-};
-
-struct usbfs_bulktransfer {
-	/* keep in sync with usbdevice_fs.h:usbdevfs_bulktransfer */
-	unsigned int ep;
-	unsigned int len;
-	unsigned int timeout;	/* in milliseconds */
-
-	/* pointer to data */
-	void *data;
-};
-
-struct usbfs_setinterface {
-	/* keep in sync with usbdevice_fs.h:usbdevfs_setinterface */
-	unsigned int interface;
-	unsigned int altsetting;
-};
-
-#define USBFS_MAXDRIVERNAME 255
-
-struct usbfs_getdriver {
-	unsigned int interface;
-	char driver[USBFS_MAXDRIVERNAME + 1];
-};
-
-#define USBFS_URB_SHORT_NOT_OK		0x01
-#define USBFS_URB_ISO_ASAP			0x02
-#define USBFS_URB_BULK_CONTINUATION	0x04
-#define USBFS_URB_QUEUE_BULK		0x10
-#define USBFS_URB_ZERO_PACKET		0x40
-
-enum usbfs_urb_type {
-	USBFS_URB_TYPE_ISO = 0,
-	USBFS_URB_TYPE_INTERRUPT = 1,
-	USBFS_URB_TYPE_CONTROL = 2,
-	USBFS_URB_TYPE_BULK = 3,
-};
-
-struct usbfs_iso_packet_desc {
-	unsigned int length;
-	unsigned int actual_length;
-	unsigned int status;
-};
-
-#define MAX_ISO_BUFFER_LENGTH		32768
-#define MAX_BULK_BUFFER_LENGTH		16384
-#define MAX_CTRL_BUFFER_LENGTH		4096
-
-struct usbfs_urb {
-	unsigned char type;
-	unsigned char endpoint;
-	int status;
-	unsigned int flags;
-	void *buffer;
-	int buffer_length;
-	int actual_length;
-	int start_frame;
-	int number_of_packets;
-	int error_count;
-	unsigned int signr;
-	void *usercontext;
-	struct usbfs_iso_packet_desc iso_frame_desc[0];
-};
-
-struct usbfs_connectinfo {
-	unsigned int devnum;
-	unsigned char slow;
-};
-
-struct usbfs_ioctl {
-	int ifno;	/* interface 0..N ; negative numbers reserved */
-	int ioctl_code;	/* MUST encode size + direction of data so the
-			 * macros in <asm/ioctl.h> give correct values */
-	void *data;	/* param buffer (in, or out) */
-};
-
-struct usbfs_hub_portinfo {
-	unsigned char numports;
-	unsigned char port[127];	/* port to device num mapping */
-};
-
-#define USBFS_CAP_ZERO_PACKET		0x01
-#define USBFS_CAP_BULK_CONTINUATION	0x02
-#define USBFS_CAP_NO_PACKET_SIZE_LIM	0x04
-#define USBFS_CAP_BULK_SCATTER_GATHER	0x08
-
-#define USBFS_DISCONNECT_CLAIM_IF_DRIVER	0x01
-#define USBFS_DISCONNECT_CLAIM_EXCEPT_DRIVER	0x02
-
-struct usbfs_disconnect_claim {
-	unsigned int interface;
-	unsigned int flags;
-	char driver[USBFS_MAXDRIVERNAME + 1];
-};
-
-#define IOCTL_USBFS_CONTROL	_IOWR('U', 0, struct usbfs_ctrltransfer)
-#define IOCTL_USBFS_BULK		_IOWR('U', 2, struct usbfs_bulktransfer)
-#define IOCTL_USBFS_RESETEP	_IOR('U', 3, unsigned int)
-#define IOCTL_USBFS_SETINTF	_IOR('U', 4, struct usbfs_setinterface)
-#define IOCTL_USBFS_SETCONFIG	_IOR('U', 5, unsigned int)
-#define IOCTL_USBFS_GETDRIVER	_IOW('U', 8, struct usbfs_getdriver)
-#define IOCTL_USBFS_SUBMITURB	_IOR('U', 10, struct usbfs_urb)
-#define IOCTL_USBFS_DISCARDURB	_IO('U', 11)
-#define IOCTL_USBFS_REAPURB	_IOW('U', 12, void *)
-#define IOCTL_USBFS_REAPURBNDELAY	_IOW('U', 13, void *)
-#define IOCTL_USBFS_CLAIMINTF	_IOR('U', 15, unsigned int)
-#define IOCTL_USBFS_RELEASEINTF	_IOR('U', 16, unsigned int)
-#define IOCTL_USBFS_CONNECTINFO	_IOW('U', 17, struct usbfs_connectinfo)
-#define IOCTL_USBFS_IOCTL         _IOWR('U', 18, struct usbfs_ioctl)
-#define IOCTL_USBFS_HUB_PORTINFO	_IOR('U', 19, struct usbfs_hub_portinfo)
-#define IOCTL_USBFS_RESET		_IO('U', 20)
-#define IOCTL_USBFS_CLEAR_HALT	_IOR('U', 21, unsigned int)
-#define IOCTL_USBFS_DISCONNECT	_IO('U', 22)
-#define IOCTL_USBFS_CONNECT	_IO('U', 23)
-#define IOCTL_USBFS_CLAIM_PORT	_IOR('U', 24, unsigned int)
-#define IOCTL_USBFS_RELEASE_PORT	_IOR('U', 25, unsigned int)
-#define IOCTL_USBFS_GET_CAPABILITIES	_IOR('U', 26, __u32)
-#define IOCTL_USBFS_DISCONNECT_CLAIM	_IOR('U', 27, struct usbfs_disconnect_claim)
-
-extern usbi_mutex_static_t linux_hotplug_lock;
-
-#if defined(HAVE_LIBUDEV)
-int linux_udev_start_event_monitor(void);
-int linux_udev_stop_event_monitor(void);
-int linux_udev_scan_devices(struct libusb_context *ctx);
-void linux_udev_hotplug_poll(void);
-#else
-int linux_netlink_start_event_monitor(void);
-int linux_netlink_stop_event_monitor(void);
-void linux_netlink_hotplug_poll(void);
-#endif
-
-void linux_hotplug_enumerate(uint8_t busnum, uint8_t devaddr, const char *sys_name);
-void linux_hotplug_disconnected(uint8_t busnum, uint8_t devaddr, const char *sys_name);
-
-int linux_get_device_address (struct libusb_context *ctx, int detached,
-	uint8_t *busnum, uint8_t *devaddr, const char *dev_node,
-	const char *sys_name);
-int linux_enumerate_device(struct libusb_context *ctx,
-	uint8_t busnum, uint8_t devaddr, const char *sysfs_dir);
-
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/openbsd_usb.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/openbsd_usb.c
deleted file mode 100644
index f4fd4543a6..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/openbsd_usb.c
+++ /dev/null
@@ -1,734 +0,0 @@
-/*
- * Copyright © 2011 Martin Pieuchot <mpi@openbsd.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <sys/time.h>
-#include <sys/types.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <dev/usb/usb.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-
-struct device_priv {
-	char devnode[16];
-	int fd;
-
-	unsigned char *cdesc;			/* active config descriptor */
-	usb_device_descriptor_t ddesc;		/* usb device descriptor */
-};
-
-struct handle_priv {
-	int pipe[2];				/* for event notification */
-	int endpoints[USB_MAX_ENDPOINTS];
-};
-
-/*
- * Backend functions
- */
-static int obsd_get_device_list(struct libusb_context *,
-    struct discovered_devs **);
-static int obsd_open(struct libusb_device_handle *);
-static void obsd_close(struct libusb_device_handle *);
-
-static int obsd_get_device_descriptor(struct libusb_device *, unsigned char *,
-    int *);
-static int obsd_get_active_config_descriptor(struct libusb_device *,
-    unsigned char *, size_t, int *);
-static int obsd_get_config_descriptor(struct libusb_device *, uint8_t,
-    unsigned char *, size_t, int *);
-
-static int obsd_get_configuration(struct libusb_device_handle *, int *);
-static int obsd_set_configuration(struct libusb_device_handle *, int);
-
-static int obsd_claim_interface(struct libusb_device_handle *, int);
-static int obsd_release_interface(struct libusb_device_handle *, int);
-
-static int obsd_set_interface_altsetting(struct libusb_device_handle *, int,
-    int);
-static int obsd_clear_halt(struct libusb_device_handle *, unsigned char);
-static int obsd_reset_device(struct libusb_device_handle *);
-static void obsd_destroy_device(struct libusb_device *);
-
-static int obsd_submit_transfer(struct usbi_transfer *);
-static int obsd_cancel_transfer(struct usbi_transfer *);
-static void obsd_clear_transfer_priv(struct usbi_transfer *);
-static int obsd_handle_events(struct libusb_context *ctx, struct pollfd *,
-    nfds_t, int);
-static int obsd_clock_gettime(int, struct timespec *);
-
-/*
- * Private functions
- */
-static int _errno_to_libusb(int);
-static int _cache_active_config_descriptor(struct libusb_device *, int);
-static int _sync_control_transfer(struct usbi_transfer *);
-static int _sync_gen_transfer(struct usbi_transfer *);
-static int _access_endpoint(struct libusb_transfer *);
-
-const struct usbi_os_backend openbsd_backend = {
-	"Synchronous OpenBSD backend",
-	0,
-	NULL,				/* init() */
-	NULL,				/* exit() */
-	obsd_get_device_list,
-	NULL,				/* hotplug_poll */
-	obsd_open,
-	obsd_close,
-
-	obsd_get_device_descriptor,
-	obsd_get_active_config_descriptor,
-	obsd_get_config_descriptor,
-	NULL,				/* get_config_descriptor_by_value() */
-
-	obsd_get_configuration,
-	obsd_set_configuration,
-
-	obsd_claim_interface,
-	obsd_release_interface,
-
-	obsd_set_interface_altsetting,
-	obsd_clear_halt,
-	obsd_reset_device,
-
-	NULL,				/* kernel_driver_active() */
-	NULL,				/* detach_kernel_driver() */
-	NULL,				/* attach_kernel_driver() */
-
-	obsd_destroy_device,
-
-	obsd_submit_transfer,
-	obsd_cancel_transfer,
-	obsd_clear_transfer_priv,
-
-	obsd_handle_events,
-
-	obsd_clock_gettime,
-	sizeof(struct device_priv),
-	sizeof(struct handle_priv),
-	0,				/* transfer_priv_size */
-	0,				/* add_iso_packet_size */
-};
-
-int
-obsd_get_device_list(struct libusb_context * ctx,
-	struct discovered_devs **discdevs)
-{
-	struct libusb_device *dev;
-	struct device_priv *dpriv;
-	struct usb_device_info di;
-	unsigned long session_id;
-	char devnode[16];
-	int fd, err, i;
-
-	usbi_dbg("");
-
-	/* Only ugen(4) is supported */
-	for (i = 0; i < USB_MAX_DEVICES; i++) {
-		/* Control endpoint is always .00 */
-		snprintf(devnode, sizeof(devnode), "/dev/ugen%d.00", i);
-
-		if ((fd = open(devnode, O_RDONLY)) < 0) {
-			if (errno != ENOENT && errno != ENXIO)
-				usbi_err(ctx, "could not open %s", devnode);
-			continue;
-		}
-
-		if (ioctl(fd, USB_GET_DEVICEINFO, &di) < 0)
-			continue;
-
-		session_id = (di.udi_bus << 8 | di.udi_addr);
-		dev = usbi_get_device_by_session_id(ctx, session_id);
-
-		if (dev) {
-			dev = libusb_ref_device(dev);
-		} else {
-			dev = usbi_alloc_device(ctx, session_id);
-			if (dev == NULL)
-				return (LIBUSB_ERROR_NO_MEM);
-
-			dev->bus_number = di.udi_bus;
-			dev->device_address = di.udi_addr;
-			dev->speed = di.udi_speed;
-
-			dpriv = (struct device_priv *)dev->os_priv;
-			strlcpy(dpriv->devnode, devnode, sizeof(devnode));
-			dpriv->fd = -1;
-
-			if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
-				err = errno;
-				goto error;
-			}
-
-			dpriv->cdesc = NULL;
-			if (_cache_active_config_descriptor(dev, fd)) {
-				err = errno;
-				goto error;
-			}
-
-			if ((err = usbi_sanitize_device(dev)))
-				goto error;
-		}
-		close(fd);
-
-		if (discovered_devs_append(*discdevs, dev) == NULL)
-			return (LIBUSB_ERROR_NO_MEM);
-
-		libusb_unref_device(dev);
-	}
-
-	return (LIBUSB_SUCCESS);
-
-error:
-	close(fd);
-	libusb_unref_device(dev);
-	return _errno_to_libusb(err);
-}
-
-int
-obsd_open(struct libusb_device_handle *handle)
-{
-	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
-	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
-
-	dpriv->fd = open(dpriv->devnode, O_RDWR);
-	if (dpriv->fd < 0) {
-		dpriv->fd = open(dpriv->devnode, O_RDONLY);
-		if (dpriv->fd < 0)
-			return _errno_to_libusb(errno);
-	}
-
-	usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
-
-	if (pipe(hpriv->pipe) < 0)
-		return _errno_to_libusb(errno);
-
-	return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
-}
-
-void
-obsd_close(struct libusb_device_handle *handle)
-{
-	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
-	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
-
-	usbi_dbg("close: fd %d", dpriv->fd);
-
-	close(dpriv->fd);
-	dpriv->fd = -1;
-
-	usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
-
-	close(hpriv->pipe[0]);
-	close(hpriv->pipe[1]);
-}
-
-int
-obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
-    int *host_endian)
-{
-	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
-
-	usbi_dbg("");
-
-	memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
-
-	*host_endian = 0;
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_get_active_config_descriptor(struct libusb_device *dev,
-    unsigned char *buf, size_t len, int *host_endian)
-{
-	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
-	usb_config_descriptor_t *ucd;
-
-	ucd = (usb_config_descriptor_t *) dpriv->cdesc;
-	len = MIN(len, UGETW(ucd->wTotalLength));
-
-	usbi_dbg("len %d", len);
-
-	memcpy(buf, dpriv->cdesc, len);
-
-	*host_endian = 0;
-
-	return len;
-}
-
-int
-obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
-    unsigned char *buf, size_t len, int *host_endian)
-{
-	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
-	struct usb_full_desc ufd;
-	int fd, err;
-
-	usbi_dbg("index %d, len %d", idx, len);
-
-	/* A config descriptor may be requested before opening the device */
-	if (dpriv->fd >= 0) {
-		fd = dpriv->fd;
-	} else {
-		fd = open(dpriv->devnode, O_RDONLY);
-		if (fd < 0)
-			return _errno_to_libusb(errno);
-	}
-
-	ufd.ufd_config_index = idx;
-	ufd.ufd_size = len;
-	ufd.ufd_data = buf;
-
-	if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
-		err = errno;
-		if (dpriv->fd < 0)
-			close(fd);
-		return _errno_to_libusb(err);
-	}
-
-	if (dpriv->fd < 0)
-		close(fd);
-
-	*host_endian = 0;
-
-	return len;
-}
-
-int
-obsd_get_configuration(struct libusb_device_handle *handle, int *config)
-{
-	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
-
-	usbi_dbg("");
-
-	if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
-		return _errno_to_libusb(errno);
-
-	usbi_dbg("configuration %d", *config);
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_set_configuration(struct libusb_device_handle *handle, int config)
-{
-	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
-
-	usbi_dbg("configuration %d", config);
-
-	if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
-		return _errno_to_libusb(errno);
-
-	return _cache_active_config_descriptor(handle->dev, dpriv->fd);
-}
-
-int
-obsd_claim_interface(struct libusb_device_handle *handle, int iface)
-{
-	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
-	int i;
-
-	for (i = 0; i < USB_MAX_ENDPOINTS; i++)
-		hpriv->endpoints[i] = -1;
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_release_interface(struct libusb_device_handle *handle, int iface)
-{
-	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
-	int i;
-
-	for (i = 0; i < USB_MAX_ENDPOINTS; i++)
-		if (hpriv->endpoints[i] >= 0)
-			close(hpriv->endpoints[i]);
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
-    int altsetting)
-{
-	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
-	struct usb_alt_interface intf;
-
-	usbi_dbg("iface %d, setting %d", iface, altsetting);
-
-	memset(&intf, 0, sizeof(intf));
-
-	intf.uai_interface_index = iface;
-	intf.uai_alt_no = altsetting;
-
-	if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
-		return _errno_to_libusb(errno);
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
-{
-	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
-	struct usb_ctl_request req;
-
-	usbi_dbg("");
-
-	req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
-	req.ucr_request.bRequest = UR_CLEAR_FEATURE;
-	USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
-	USETW(req.ucr_request.wIndex, endpoint);
-	USETW(req.ucr_request.wLength, 0);
-
-	if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
-		return _errno_to_libusb(errno);
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_reset_device(struct libusb_device_handle *handle)
-{
-	usbi_dbg("");
-
-	return (LIBUSB_ERROR_NOT_SUPPORTED);
-}
-
-void
-obsd_destroy_device(struct libusb_device *dev)
-{
-	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
-
-	usbi_dbg("");
-
-	free(dpriv->cdesc);
-}
-
-int
-obsd_submit_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer;
-	struct handle_priv *hpriv;
-	int err = 0;
-
-	usbi_dbg("");
-
-	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-		err = _sync_control_transfer(itransfer);
-		break;
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		if (IS_XFEROUT(transfer)) {
-			/* Isochronous write is not supported */
-			err = LIBUSB_ERROR_NOT_SUPPORTED;
-			break;
-		}
-		err = _sync_gen_transfer(itransfer);
-		break;
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-		if (IS_XFEROUT(transfer) &&
-		    transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
-			err = LIBUSB_ERROR_NOT_SUPPORTED;
-			break;
-		}
-		err = _sync_gen_transfer(itransfer);
-		break;
-	}
-
-	if (err)
-		return (err);
-
-	if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
-		return _errno_to_libusb(errno);
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_cancel_transfer(struct usbi_transfer *itransfer)
-{
-	usbi_dbg("");
-
-	return (LIBUSB_ERROR_NOT_SUPPORTED);
-}
-
-void
-obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
-{
-	usbi_dbg("");
-
-	/* Nothing to do */
-}
-
-int
-obsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
-    int num_ready)
-{
-	struct libusb_device_handle *handle;
-	struct handle_priv *hpriv = NULL;
-	struct usbi_transfer *itransfer;
-	struct pollfd *pollfd;
-	int i, err = 0;
-
-	usbi_dbg("");
-
-	pthread_mutex_lock(&ctx->open_devs_lock);
-	for (i = 0; i < nfds && num_ready > 0; i++) {
-		pollfd = &fds[i];
-
-		if (!pollfd->revents)
-			continue;
-
-		hpriv = NULL;
-		num_ready--;
-		list_for_each_entry(handle, &ctx->open_devs, list,
-		    struct libusb_device_handle) {
-			hpriv = (struct handle_priv *)handle->os_priv;
-
-			if (hpriv->pipe[0] == pollfd->fd)
-				break;
-
-			hpriv = NULL;
-		}
-
-		if (NULL == hpriv) {
-			usbi_dbg("fd %d is not an event pipe!", pollfd->fd);
-			err = ENOENT;
-			break;
-		}
-
-		if (pollfd->revents & POLLERR) {
-			usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
-			usbi_handle_disconnect(handle);
-			continue;
-		}
-
-		if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
-			err = errno;
-			break;
-		}
-
-		if ((err = usbi_handle_transfer_completion(itransfer,
-		    LIBUSB_TRANSFER_COMPLETED)))
-			break;
-	}
-	pthread_mutex_unlock(&ctx->open_devs_lock);
-
-	if (err)
-		return _errno_to_libusb(err);
-
-	return (LIBUSB_SUCCESS);
-}
-
-int
-obsd_clock_gettime(int clkid, struct timespec *tp)
-{
-	usbi_dbg("clock %d", clkid);
-
-	if (clkid == USBI_CLOCK_REALTIME)
-		return clock_gettime(CLOCK_REALTIME, tp);
-
-	if (clkid == USBI_CLOCK_MONOTONIC)
-		return clock_gettime(CLOCK_MONOTONIC, tp);
-
-	return (LIBUSB_ERROR_INVALID_PARAM);
-}
-
-int
-_errno_to_libusb(int err)
-{
-	switch (err) {
-	case EIO:
-		return (LIBUSB_ERROR_IO);
-	case EACCES:
-		return (LIBUSB_ERROR_ACCESS);
-	case ENOENT:
-		return (LIBUSB_ERROR_NO_DEVICE);
-	case ENOMEM:
-		return (LIBUSB_ERROR_NO_MEM);
-	}
-
-	usbi_dbg("error: %s", strerror(err));
-
-	return (LIBUSB_ERROR_OTHER);
-}
-
-int
-_cache_active_config_descriptor(struct libusb_device *dev, int fd)
-{
-	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
-	struct usb_config_desc ucd;
-	struct usb_full_desc ufd;
-	unsigned char* buf;
-	int len;
-
-	usbi_dbg("fd %d", fd);
-
-	ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
-
-	if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
-		return _errno_to_libusb(errno);
-
-	usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
-
-	len = UGETW(ucd.ucd_desc.wTotalLength);
-	buf = malloc(len);
-	if (buf == NULL)
-		return (LIBUSB_ERROR_NO_MEM);
-
-	ufd.ufd_config_index = ucd.ucd_config_index;
-	ufd.ufd_size = len;
-	ufd.ufd_data = buf;
-
-	usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
-
-	if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
-		free(buf);
-		return _errno_to_libusb(errno);
-	}
-
-	if (dpriv->cdesc)
-		free(dpriv->cdesc);
-	dpriv->cdesc = buf;
-
-	return (0);
-}
-
-int
-_sync_control_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer;
-	struct libusb_control_setup *setup;
-	struct device_priv *dpriv;
-	struct usb_ctl_request req;
-
-	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
-	setup = (struct libusb_control_setup *)transfer->buffer;
-
-	usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
-	    setup->bmRequestType, setup->bRequest,
-	    libusb_le16_to_cpu(setup->wValue),
-	    libusb_le16_to_cpu(setup->wIndex),
-	    libusb_le16_to_cpu(setup->wLength), transfer->timeout);
-
-	req.ucr_request.bmRequestType = setup->bmRequestType;
-	req.ucr_request.bRequest = setup->bRequest;
-	/* Don't use USETW, libusbx already deals with the endianness */
-	(*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
-	(*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
-	(*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
-	req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
-
-	if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
-		req.ucr_flags = USBD_SHORT_XFER_OK;
-
-	if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
-		return _errno_to_libusb(errno);
-
-	if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
-		return _errno_to_libusb(errno);
-
-	itransfer->transferred = req.ucr_actlen;
-
-	usbi_dbg("transferred %d", itransfer->transferred);
-
-	return (0);
-}
-
-int
-_access_endpoint(struct libusb_transfer *transfer)
-{
-	struct handle_priv *hpriv;
-	struct device_priv *dpriv;
-	char *s, devnode[16];
-	int fd, endpt;
-	mode_t mode;
-
-	hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
-	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
-
-	endpt = UE_GET_ADDR(transfer->endpoint);
-	mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
-
-	usbi_dbg("endpoint %d mode %d", endpt, mode);
-
-	if (hpriv->endpoints[endpt] < 0) {
-		/* Pick the right node given the control one */
-		strlcpy(devnode, dpriv->devnode, sizeof(devnode));
-		s = strchr(devnode, '.');
-		snprintf(s, 4, ".%02d", endpt);
-
-		/* We may need to read/write to the same endpoint later. */
-		if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
-			if ((fd = open(devnode, mode)) < 0)
-				return (-1);
-
-		hpriv->endpoints[endpt] = fd;
-	}
-
-	return (hpriv->endpoints[endpt]);
-}
-
-int
-_sync_gen_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer;
-	int fd, nr = 1;
-
-	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	/*
-	 * Bulk, Interrupt or Isochronous transfer depends on the
-	 * endpoint and thus the node to open.
-	 */
-	if ((fd = _access_endpoint(transfer)) < 0)
-		return _errno_to_libusb(errno);
-
-	if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
-		return _errno_to_libusb(errno);
-
-	if (IS_XFERIN(transfer)) {
-		if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
-			if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
-				return _errno_to_libusb(errno);
-
-		nr = read(fd, transfer->buffer, transfer->length);
-	} else {
-		nr = write(fd, transfer->buffer, transfer->length);
-	}
-
-	if (nr < 0)
-		return _errno_to_libusb(errno);
-
-	itransfer->transferred = nr;
-
-	return (0);
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_posix.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_posix.c
deleted file mode 100644
index eeaf5dce49..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_posix.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * poll_posix: poll compatibility wrapper for POSIX systems
- * Copyright © 2013 RealVNC Ltd.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <stdlib.h>
-
-#include "libusbi.h"
-
-int usbi_pipe(int pipefd[2])
-{
-	int ret = pipe(pipefd);
-	if (ret != 0) {
-		return ret;
-	}
-	ret = fcntl(pipefd[1], F_GETFL);
-	if (ret == -1) {
-		usbi_dbg("Failed to get pipe fd flags: %d", errno);
-		goto err_close_pipe;
-	}
-	ret = fcntl(pipefd[1], F_SETFL, ret | O_NONBLOCK);
-	if (ret != 0) {
-		usbi_dbg("Failed to set non-blocking on new pipe: %d", errno);
-		goto err_close_pipe;
-	}
-
-	return 0;
-
-err_close_pipe:
-	usbi_close(pipefd[0]);
-	usbi_close(pipefd[1]);
-	return ret;
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_posix.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_posix.h
deleted file mode 100644
index 5b4b2c905e..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_posix.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#ifndef LIBUSB_POLL_POSIX_H
-#define LIBUSB_POLL_POSIX_H
-
-#define usbi_write write
-#define usbi_read read
-#define usbi_close close
-#define usbi_poll poll
-
-int usbi_pipe(int pipefd[2]);
-
-#endif /* LIBUSB_POLL_POSIX_H */
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_windows.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_windows.c
deleted file mode 100644
index 7ed19ba324..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_windows.c
+++ /dev/null
@@ -1,726 +0,0 @@
-/*
- * poll_windows: poll compatibility wrapper for Windows
- * Copyright © 2012-2013 RealVNC Ltd.
- * Copyright © 2009-2010 Pete Batard <pete@akeo.ie>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of poll implementation from libusb-win32, by Stephan Meyer et al.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-
-/*
- * poll() and pipe() Windows compatibility layer for libusbx 1.0
- *
- * The way this layer works is by using OVERLAPPED with async I/O transfers, as
- * OVERLAPPED have an associated event which is flagged for I/O completion.
- *
- * For USB pollable async I/O, you would typically:
- * - obtain a Windows HANDLE to a file or device that has been opened in
- *   OVERLAPPED mode
- * - call usbi_create_fd with this handle to obtain a custom fd.
- *   Note that if you need simultaneous R/W access, you need to call create_fd
- *   twice, once in RW_READ and once in RW_WRITE mode to obtain 2 separate
- *   pollable fds
- * - leave the core functions call the poll routine and flag POLLIN/POLLOUT
- *
- * The pipe pollable synchronous I/O works using the overlapped event associated
- * with a fake pipe. The read/write functions are only meant to be used in that
- * context.
- */
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "libusbi.h"
-
-// Uncomment to debug the polling layer
-//#define DEBUG_POLL_WINDOWS
-#if defined(DEBUG_POLL_WINDOWS)
-#define poll_dbg usbi_dbg
-#else
-// MSVC++ < 2005 cannot use a variadic argument and non MSVC
-// compilers produce warnings if parenthesis are ommitted.
-#if defined(_MSC_VER) && (_MSC_VER < 1400)
-#define poll_dbg
-#else
-#define poll_dbg(...)
-#endif
-#endif
-
-#if defined(_PREFAST_)
-#pragma warning(disable:28719)
-#endif
-
-#define CHECK_INIT_POLLING do {if(!is_polling_set) init_polling();} while(0)
-
-// public fd data
-const struct winfd INVALID_WINFD = {-1, INVALID_HANDLE_VALUE, NULL, NULL, NULL, RW_NONE};
-struct winfd poll_fd[MAX_FDS];
-// internal fd data
-struct {
-	CRITICAL_SECTION mutex; // lock for fds
-	// Additional variables for XP CancelIoEx partial emulation
-	HANDLE original_handle;
-	DWORD thread_id;
-} _poll_fd[MAX_FDS];
-
-// globals
-BOOLEAN is_polling_set = FALSE;
-LONG pipe_number = 0;
-static volatile LONG compat_spinlock = 0;
-
-#if !defined(_WIN32_WCE)
-// CancelIoEx, available on Vista and later only, provides the ability to cancel
-// a single transfer (OVERLAPPED) when used. As it may not be part of any of the
-// platform headers, we hook into the Kernel32 system DLL directly to seek it.
-static BOOL (__stdcall *pCancelIoEx)(HANDLE, LPOVERLAPPED) = NULL;
-#define Use_Duplicate_Handles (pCancelIoEx == NULL)
-
-static inline void setup_cancel_io(void)
-{
-	HMODULE hKernel32 = GetModuleHandleA("KERNEL32");
-	if (hKernel32 != NULL) {
-		pCancelIoEx = (BOOL (__stdcall *)(HANDLE,LPOVERLAPPED))
-			GetProcAddress(hKernel32, "CancelIoEx");
-	}
-	usbi_dbg("Will use CancelIo%s for I/O cancellation",
-		Use_Duplicate_Handles?"":"Ex");
-}
-
-static inline BOOL cancel_io(int _index)
-{
-	if ((_index < 0) || (_index >= MAX_FDS)) {
-		return FALSE;
-	}
-
-	if ( (poll_fd[_index].fd < 0) || (poll_fd[_index].handle == INVALID_HANDLE_VALUE)
-	  || (poll_fd[_index].handle == 0) || (poll_fd[_index].overlapped == NULL) ) {
-		return TRUE;
-	}
-	if (poll_fd[_index].itransfer && poll_fd[_index].cancel_fn) {
-		// Cancel outstanding transfer via the specific callback
-		(*poll_fd[_index].cancel_fn)(poll_fd[_index].itransfer);
-		return TRUE;
-	}
-	if (pCancelIoEx != NULL) {
-		return (*pCancelIoEx)(poll_fd[_index].handle, poll_fd[_index].overlapped);
-	}
-	if (_poll_fd[_index].thread_id == GetCurrentThreadId()) {
-		return CancelIo(poll_fd[_index].handle);
-	}
-	usbi_warn(NULL, "Unable to cancel I/O that was started from another thread");
-	return FALSE;
-}
-#else
-#define Use_Duplicate_Handles FALSE
-
-static __inline void setup_cancel_io()
-{
-	// No setup needed on WinCE
-}
-
-static __inline BOOL cancel_io(int _index)
-{
-	if ((_index < 0) || (_index >= MAX_FDS)) {
-		return FALSE;
-	}
-	if ( (poll_fd[_index].fd < 0) || (poll_fd[_index].handle == INVALID_HANDLE_VALUE)
-	  || (poll_fd[_index].handle == 0) || (poll_fd[_index].overlapped == NULL) ) {
-		return TRUE;
-	}
-	if (poll_fd[_index].itransfer && poll_fd[_index].cancel_fn) {
-		// Cancel outstanding transfer via the specific callback
-		(*poll_fd[_index].cancel_fn)(poll_fd[_index].itransfer);
-	}
-	return TRUE;
-}
-#endif
-
-// Init
-void init_polling(void)
-{
-	int i;
-
-	while (InterlockedExchange((LONG *)&compat_spinlock, 1) == 1) {
-		SleepEx(0, TRUE);
-	}
-	if (!is_polling_set) {
-		setup_cancel_io();
-		for (i=0; i<MAX_FDS; i++) {
-			poll_fd[i] = INVALID_WINFD;
-			_poll_fd[i].original_handle = INVALID_HANDLE_VALUE;
-			_poll_fd[i].thread_id = 0;
-			InitializeCriticalSection(&_poll_fd[i].mutex);
-		}
-		is_polling_set = TRUE;
-	}
-	InterlockedExchange((LONG *)&compat_spinlock, 0);
-}
-
-// Internal function to retrieve the table index (and lock the fd mutex)
-static int _fd_to_index_and_lock(int fd)
-{
-	int i;
-
-	if (fd < 0)
-		return -1;
-
-	for (i=0; i<MAX_FDS; i++) {
-		if (poll_fd[i].fd == fd) {
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			// fd might have changed before we got to critical
-			if (poll_fd[i].fd != fd) {
-				LeaveCriticalSection(&_poll_fd[i].mutex);
-				continue;
-			}
-			return i;
-		}
-	}
-	return -1;
-}
-
-static OVERLAPPED *create_overlapped(void)
-{
-	OVERLAPPED *overlapped = (OVERLAPPED*) calloc(1, sizeof(OVERLAPPED));
-	if (overlapped == NULL) {
-		return NULL;
-	}
-	overlapped->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
-	if(overlapped->hEvent == NULL) {
-		free (overlapped);
-		return NULL;
-	}
-	return overlapped;
-}
-
-static void free_overlapped(OVERLAPPED *overlapped)
-{
-	if (overlapped == NULL)
-		return;
-
-	if ( (overlapped->hEvent != 0)
-	  && (overlapped->hEvent != INVALID_HANDLE_VALUE) ) {
-		CloseHandle(overlapped->hEvent);
-	}
-	free(overlapped);
-}
-
-void exit_polling(void)
-{
-	int i;
-
-	while (InterlockedExchange((LONG *)&compat_spinlock, 1) == 1) {
-		SleepEx(0, TRUE);
-	}
-	if (is_polling_set) {
-		is_polling_set = FALSE;
-
-		for (i=0; i<MAX_FDS; i++) {
-			// Cancel any async I/O (handle can be invalid)
-			cancel_io(i);
-			// If anything was pending on that I/O, it should be
-			// terminating, and we should be able to access the fd
-			// mutex lock before too long
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			free_overlapped(poll_fd[i].overlapped);
-			if (Use_Duplicate_Handles) {
-				// Close duplicate handle
-				if (_poll_fd[i].original_handle != INVALID_HANDLE_VALUE) {
-					CloseHandle(poll_fd[i].handle);
-				}
-			}
-			poll_fd[i] = INVALID_WINFD;
-			LeaveCriticalSection(&_poll_fd[i].mutex);
-			DeleteCriticalSection(&_poll_fd[i].mutex);
-		}
-	}
-	InterlockedExchange((LONG *)&compat_spinlock, 0);
-}
-
-/*
- * Create a fake pipe.
- * As libusbx only uses pipes for signaling, all we need from a pipe is an
- * event. To that extent, we create a single wfd and overlapped as a means
- * to access that event.
- */
-int usbi_pipe(int filedes[2])
-{
-	int i;
-	OVERLAPPED* overlapped;
-
-	CHECK_INIT_POLLING;
-
-	overlapped = create_overlapped();
-
-	if (overlapped == NULL) {
-		return -1;
-	}
-	// The overlapped must have status pending for signaling to work in poll
-	overlapped->Internal = STATUS_PENDING;
-	overlapped->InternalHigh = 0;
-
-	for (i=0; i<MAX_FDS; i++) {
-		if (poll_fd[i].fd < 0) {
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			// fd might have been allocated before we got to critical
-			if (poll_fd[i].fd >= 0) {
-				LeaveCriticalSection(&_poll_fd[i].mutex);
-				continue;
-			}
-
-			// Use index as the unique fd number
-			poll_fd[i].fd = i;
-			// Read end of the "pipe"
-			filedes[0] = poll_fd[i].fd;
-			// We can use the same handle for both ends
-			filedes[1] = filedes[0];
-
-			poll_fd[i].handle = DUMMY_HANDLE;
-			poll_fd[i].overlapped = overlapped;
-			// There's no polling on the write end, so we just use READ for our needs
-			poll_fd[i].rw = RW_READ;
-			_poll_fd[i].original_handle = INVALID_HANDLE_VALUE;
-			LeaveCriticalSection(&_poll_fd[i].mutex);
-			return 0;
-		}
-	}
-	free_overlapped(overlapped);
-	return -1;
-}
-
-/*
- * Create both an fd and an OVERLAPPED from an open Windows handle, so that
- * it can be used with our polling function
- * The handle MUST support overlapped transfers (usually requires CreateFile
- * with FILE_FLAG_OVERLAPPED)
- * Return a pollable file descriptor struct, or INVALID_WINFD on error
- *
- * Note that the fd returned by this function is a per-transfer fd, rather
- * than a per-session fd and cannot be used for anything else but our
- * custom functions (the fd itself points to the NUL: device)
- * if you plan to do R/W on the same handle, you MUST create 2 fds: one for
- * read and one for write. Using a single R/W fd is unsupported and will
- * produce unexpected results
- */
-struct winfd usbi_create_fd(HANDLE handle, int access_mode, struct usbi_transfer *itransfer, cancel_transfer *cancel_fn)
-{
-	int i;
-	struct winfd wfd = INVALID_WINFD;
-	OVERLAPPED* overlapped = NULL;
-
-	CHECK_INIT_POLLING;
-
-	if ((handle == 0) || (handle == INVALID_HANDLE_VALUE)) {
-		return INVALID_WINFD;
-	}
-
-	wfd.itransfer = itransfer;
-	wfd.cancel_fn = cancel_fn;
-
-	if ((access_mode != RW_READ) && (access_mode != RW_WRITE)) {
-		usbi_warn(NULL, "only one of RW_READ or RW_WRITE are supported.\n"
-			"If you want to poll for R/W simultaneously, create multiple fds from the same handle.");
-		return INVALID_WINFD;
-	}
-	if (access_mode == RW_READ) {
-		wfd.rw = RW_READ;
-	} else {
-		wfd.rw = RW_WRITE;
-	}
-
-	overlapped = create_overlapped();
-	if(overlapped == NULL) {
-		return INVALID_WINFD;
-	}
-
-	for (i=0; i<MAX_FDS; i++) {
-		if (poll_fd[i].fd < 0) {
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			// fd might have been removed before we got to critical
-			if (poll_fd[i].fd >= 0) {
-				LeaveCriticalSection(&_poll_fd[i].mutex);
-				continue;
-			}
-			// Use index as the unique fd number
-			wfd.fd = i;
-			// Attempt to emulate some of the CancelIoEx behaviour on platforms
-			// that don't have it
-			if (Use_Duplicate_Handles) {
-				_poll_fd[i].thread_id = GetCurrentThreadId();
-				if (!DuplicateHandle(GetCurrentProcess(), handle, GetCurrentProcess(),
-					&wfd.handle, 0, TRUE, DUPLICATE_SAME_ACCESS)) {
-					usbi_dbg("could not duplicate handle for CancelIo - using original one");
-					wfd.handle = handle;
-					// Make sure we won't close the original handle on fd deletion then
-					_poll_fd[i].original_handle = INVALID_HANDLE_VALUE;
-				} else {
-					_poll_fd[i].original_handle = handle;
-				}
-			} else {
-				wfd.handle = handle;
-			}
-			wfd.overlapped = overlapped;
-			memcpy(&poll_fd[i], &wfd, sizeof(struct winfd));
-			LeaveCriticalSection(&_poll_fd[i].mutex);
-			return wfd;
-		}
-	}
-	free_overlapped(overlapped);
-	return INVALID_WINFD;
-}
-
-static void _free_index(int _index)
-{
-	// Cancel any async IO (Don't care about the validity of our handles for this)
-	cancel_io(_index);
-	// close the duplicate handle (if we have an actual duplicate)
-	if (Use_Duplicate_Handles) {
-		if (_poll_fd[_index].original_handle != INVALID_HANDLE_VALUE) {
-			CloseHandle(poll_fd[_index].handle);
-		}
-		_poll_fd[_index].original_handle = INVALID_HANDLE_VALUE;
-		_poll_fd[_index].thread_id = 0;
-	}
-	free_overlapped(poll_fd[_index].overlapped);
-	poll_fd[_index] = INVALID_WINFD;
-}
-
-/*
- * Release a pollable file descriptor.
- *
- * Note that the associated Windows handle is not closed by this call
- */
-void usbi_free_fd(struct winfd *wfd)
-{
-	int _index;
-
-	CHECK_INIT_POLLING;
-
-	_index = _fd_to_index_and_lock(wfd->fd);
-	if (_index < 0) {
-		return;
-	}
-	_free_index(_index);
-	*wfd = INVALID_WINFD;
-	LeaveCriticalSection(&_poll_fd[_index].mutex);
-}
-
-/*
- * The functions below perform various conversions between fd, handle and OVERLAPPED
- */
-struct winfd fd_to_winfd(int fd)
-{
-	int i;
-	struct winfd wfd;
-
-	CHECK_INIT_POLLING;
-
-	if (fd <= 0)
-		return INVALID_WINFD;
-
-	for (i=0; i<MAX_FDS; i++) {
-		if (poll_fd[i].fd == fd) {
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			// fd might have been deleted before we got to critical
-			if (poll_fd[i].fd != fd) {
-				LeaveCriticalSection(&_poll_fd[i].mutex);
-				continue;
-			}
-			memcpy(&wfd, &poll_fd[i], sizeof(struct winfd));
-			LeaveCriticalSection(&_poll_fd[i].mutex);
-			return wfd;
-		}
-	}
-	return INVALID_WINFD;
-}
-
-struct winfd handle_to_winfd(HANDLE handle)
-{
-	int i;
-	struct winfd wfd;
-
-	CHECK_INIT_POLLING;
-
-	if ((handle == 0) || (handle == INVALID_HANDLE_VALUE))
-		return INVALID_WINFD;
-
-	for (i=0; i<MAX_FDS; i++) {
-		if (poll_fd[i].handle == handle) {
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			// fd might have been deleted before we got to critical
-			if (poll_fd[i].handle != handle) {
-				LeaveCriticalSection(&_poll_fd[i].mutex);
-				continue;
-			}
-			memcpy(&wfd, &poll_fd[i], sizeof(struct winfd));
-			LeaveCriticalSection(&_poll_fd[i].mutex);
-			return wfd;
-		}
-	}
-	return INVALID_WINFD;
-}
-
-struct winfd overlapped_to_winfd(OVERLAPPED* overlapped)
-{
-	int i;
-	struct winfd wfd;
-
-	CHECK_INIT_POLLING;
-
-	if (overlapped == NULL)
-		return INVALID_WINFD;
-
-	for (i=0; i<MAX_FDS; i++) {
-		if (poll_fd[i].overlapped == overlapped) {
-			EnterCriticalSection(&_poll_fd[i].mutex);
-			// fd might have been deleted before we got to critical
-			if (poll_fd[i].overlapped != overlapped) {
-				LeaveCriticalSection(&_poll_fd[i].mutex);
-				continue;
-			}
-			memcpy(&wfd, &poll_fd[i], sizeof(struct winfd));
-			LeaveCriticalSection(&_poll_fd[i].mutex);
-			return wfd;
-		}
-	}
-	return INVALID_WINFD;
-}
-
-/*
- * POSIX poll equivalent, using Windows OVERLAPPED
- * Currently, this function only accepts one of POLLIN or POLLOUT per fd
- * (but you can create multiple fds from the same handle for read and write)
- */
-int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout)
-{
-	unsigned i;
-	int _index, object_index, triggered;
-	HANDLE *handles_to_wait_on;
-	int *handle_to_index;
-	DWORD nb_handles_to_wait_on = 0;
-	DWORD ret;
-
-	CHECK_INIT_POLLING;
-
-	triggered = 0;
-	handles_to_wait_on = (HANDLE*) calloc(nfds+1, sizeof(HANDLE));	// +1 for fd_update
-	handle_to_index = (int*) calloc(nfds, sizeof(int));
-	if ((handles_to_wait_on == NULL) || (handle_to_index == NULL)) {
-		errno = ENOMEM;
-		triggered = -1;
-		goto poll_exit;
-	}
-
-	for (i = 0; i < nfds; ++i) {
-		fds[i].revents = 0;
-
-		// Only one of POLLIN or POLLOUT can be selected with this version of poll (not both)
-		if ((fds[i].events & ~POLLIN) && (!(fds[i].events & POLLOUT))) {
-			fds[i].revents |= POLLERR;
-			errno = EACCES;
-			usbi_warn(NULL, "unsupported set of events");
-			triggered = -1;
-			goto poll_exit;
-		}
-
-		_index = _fd_to_index_and_lock(fds[i].fd);
-		poll_dbg("fd[%d]=%d: (overlapped=%p) got events %04X", i, poll_fd[_index].fd, poll_fd[_index].overlapped, fds[i].events);
-
-		if ( (_index < 0) || (poll_fd[_index].handle == INVALID_HANDLE_VALUE)
-		  || (poll_fd[_index].handle == 0) || (poll_fd[_index].overlapped == NULL)) {
-			fds[i].revents |= POLLNVAL | POLLERR;
-			errno = EBADF;
-			if (_index >= 0) {
-				LeaveCriticalSection(&_poll_fd[_index].mutex);
-			}
-			usbi_warn(NULL, "invalid fd");
-			triggered = -1;
-			goto poll_exit;
-		}
-
-		// IN or OUT must match our fd direction
-		if ((fds[i].events & POLLIN) && (poll_fd[_index].rw != RW_READ)) {
-			fds[i].revents |= POLLNVAL | POLLERR;
-			errno = EBADF;
-			usbi_warn(NULL, "attempted POLLIN on fd without READ access");
-			LeaveCriticalSection(&_poll_fd[_index].mutex);
-			triggered = -1;
-			goto poll_exit;
-		}
-
-		if ((fds[i].events & POLLOUT) && (poll_fd[_index].rw != RW_WRITE)) {
-			fds[i].revents |= POLLNVAL | POLLERR;
-			errno = EBADF;
-			usbi_warn(NULL, "attempted POLLOUT on fd without WRITE access");
-			LeaveCriticalSection(&_poll_fd[_index].mutex);
-			triggered = -1;
-			goto poll_exit;
-		}
-
-		// The following macro only works if overlapped I/O was reported pending
-		if ( (HasOverlappedIoCompleted(poll_fd[_index].overlapped))
-		  || (HasOverlappedIoCompletedSync(poll_fd[_index].overlapped)) ) {
-			poll_dbg("  completed");
-			// checks above should ensure this works:
-			fds[i].revents = fds[i].events;
-			triggered++;
-		} else {
-			handles_to_wait_on[nb_handles_to_wait_on] = poll_fd[_index].overlapped->hEvent;
-			handle_to_index[nb_handles_to_wait_on] = i;
-			nb_handles_to_wait_on++;
-		}
-		LeaveCriticalSection(&_poll_fd[_index].mutex);
-	}
-
-	// If nothing was triggered, wait on all fds that require it
-	if ((timeout != 0) && (triggered == 0) && (nb_handles_to_wait_on != 0)) {
-		if (timeout < 0) {
-			poll_dbg("starting infinite wait for %d handles...", (int)nb_handles_to_wait_on);
-		} else {
-			poll_dbg("starting %d ms wait for %d handles...", timeout, (int)nb_handles_to_wait_on);
-		}
-		ret = WaitForMultipleObjects(nb_handles_to_wait_on, handles_to_wait_on,
-			FALSE, (timeout<0)?INFINITE:(DWORD)timeout);
-		object_index = ret-WAIT_OBJECT_0;
-		if ((object_index >= 0) && ((DWORD)object_index < nb_handles_to_wait_on)) {
-			poll_dbg("  completed after wait");
-			i = handle_to_index[object_index];
-			_index = _fd_to_index_and_lock(fds[i].fd);
-			fds[i].revents = fds[i].events;
-			triggered++;
-			if (_index >= 0) {
-				LeaveCriticalSection(&_poll_fd[_index].mutex);
-			}
-		} else if (ret == WAIT_TIMEOUT) {
-			poll_dbg("  timed out");
-			triggered = 0;	// 0 = timeout
-		} else {
-			errno = EIO;
-			triggered = -1;	// error
-		}
-	}
-
-poll_exit:
-	if (handles_to_wait_on != NULL) {
-		free(handles_to_wait_on);
-	}
-	if (handle_to_index != NULL) {
-		free(handle_to_index);
-	}
-	return triggered;
-}
-
-/*
- * close a fake pipe fd
- */
-int usbi_close(int fd)
-{
-	int _index;
-	int r = -1;
-
-	CHECK_INIT_POLLING;
-
-	_index = _fd_to_index_and_lock(fd);
-
-	if (_index < 0) {
-		errno = EBADF;
-	} else {
-		free_overlapped(poll_fd[_index].overlapped);
-		poll_fd[_index] = INVALID_WINFD;
-		LeaveCriticalSection(&_poll_fd[_index].mutex);
-	}
-	return r;
-}
-
-/*
- * synchronous write for fake "pipe" signaling
- */
-ssize_t usbi_write(int fd, const void *buf, size_t count)
-{
-	int _index;
-	UNUSED(buf);
-
-	CHECK_INIT_POLLING;
-
-	if (count != sizeof(unsigned char)) {
-		usbi_err(NULL, "this function should only used for signaling");
-		return -1;
-	}
-
-	_index = _fd_to_index_and_lock(fd);
-
-	if ( (_index < 0) || (poll_fd[_index].overlapped == NULL) ) {
-		errno = EBADF;
-		if (_index >= 0) {
-			LeaveCriticalSection(&_poll_fd[_index].mutex);
-		}
-		return -1;
-	}
-
-	poll_dbg("set pipe event (fd = %d, thread = %08X)", _index, GetCurrentThreadId());
-	SetEvent(poll_fd[_index].overlapped->hEvent);
-	poll_fd[_index].overlapped->Internal = STATUS_WAIT_0;
-	// If two threads write on the pipe at the same time, we need to
-	// process two separate reads => use the overlapped as a counter
-	poll_fd[_index].overlapped->InternalHigh++;
-
-	LeaveCriticalSection(&_poll_fd[_index].mutex);
-	return sizeof(unsigned char);
-}
-
-/*
- * synchronous read for fake "pipe" signaling
- */
-ssize_t usbi_read(int fd, void *buf, size_t count)
-{
-	int _index;
-	ssize_t r = -1;
-	UNUSED(buf);
-
-	CHECK_INIT_POLLING;
-
-	if (count != sizeof(unsigned char)) {
-		usbi_err(NULL, "this function should only used for signaling");
-		return -1;
-	}
-
-	_index = _fd_to_index_and_lock(fd);
-
-	if (_index < 0) {
-		errno = EBADF;
-		return -1;
-	}
-
-	if (WaitForSingleObject(poll_fd[_index].overlapped->hEvent, INFINITE) != WAIT_OBJECT_0) {
-		usbi_warn(NULL, "waiting for event failed: %d", (int)GetLastError());
-		errno = EIO;
-		goto out;
-	}
-
-	poll_dbg("clr pipe event (fd = %d, thread = %08X)", _index, GetCurrentThreadId());
-	poll_fd[_index].overlapped->InternalHigh--;
-	// Don't reset unless we don't have any more events to process
-	if (poll_fd[_index].overlapped->InternalHigh <= 0) {
-		ResetEvent(poll_fd[_index].overlapped->hEvent);
-		poll_fd[_index].overlapped->Internal = STATUS_PENDING;
-	}
-
-	r = sizeof(unsigned char);
-
-out:
-	LeaveCriticalSection(&_poll_fd[_index].mutex);
-	return r;
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_windows.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_windows.h
deleted file mode 100644
index deed206444..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/poll_windows.h
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- * Windows compat: POSIX compatibility wrapper
- * Copyright © 2012-2013 RealVNC Ltd.
- * Copyright © 2009-2010 Pete Batard <pete@akeo.ie>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of poll implementation from libusb-win32, by Stephan Meyer et al.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-#pragma once
-
-#if defined(_MSC_VER)
-// disable /W4 MSVC warnings that are benign
-#pragma warning(disable:4127) // conditional expression is constant
-#endif
-
-// Handle synchronous completion through the overlapped structure
-#if !defined(STATUS_REPARSE)	// reuse the REPARSE status code
-#define STATUS_REPARSE ((LONG)0x00000104L)
-#endif
-#define STATUS_COMPLETED_SYNCHRONOUSLY	STATUS_REPARSE
-#if defined(_WIN32_WCE)
-// WinCE doesn't have a HasOverlappedIoCompleted() macro, so attempt to emulate it
-#define HasOverlappedIoCompleted(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) != STATUS_PENDING)
-#endif
-#define HasOverlappedIoCompletedSync(lpOverlapped)	(((DWORD)(lpOverlapped)->Internal) == STATUS_COMPLETED_SYNCHRONOUSLY)
-
-#define DUMMY_HANDLE ((HANDLE)(LONG_PTR)-2)
-
-enum windows_version {
-	WINDOWS_UNSUPPORTED,
-	WINDOWS_CE,
-	WINDOWS_XP,
-	WINDOWS_2003,	// also includes XP 64
-	WINDOWS_VISTA_AND_LATER,
-};
-extern enum windows_version windows_version;
-
-#define MAX_FDS     256
-
-#define POLLIN      0x0001    /* There is data to read */
-#define POLLPRI     0x0002    /* There is urgent data to read */
-#define POLLOUT     0x0004    /* Writing now will not block */
-#define POLLERR     0x0008    /* Error condition */
-#define POLLHUP     0x0010    /* Hung up */
-#define POLLNVAL    0x0020    /* Invalid request: fd not open */
-
-struct pollfd {
-    int fd;           /* file descriptor */
-    short events;     /* requested events */
-    short revents;    /* returned events */
-};
-
-// access modes
-enum rw_type {
-	RW_NONE,
-	RW_READ,
-	RW_WRITE,
-};
-
-// fd struct that can be used for polling on Windows
-typedef int cancel_transfer(struct usbi_transfer *itransfer);
-
-struct winfd {
-	int fd;							// what's exposed to libusb core
-	HANDLE handle;					// what we need to attach overlapped to the I/O op, so we can poll it
-	OVERLAPPED* overlapped;			// what will report our I/O status
-	struct usbi_transfer *itransfer;		// Associated transfer, or NULL if completed
-	cancel_transfer *cancel_fn;		// Function pointer to cancel transfer API
-	enum rw_type rw;				// I/O transfer direction: read *XOR* write (NOT BOTH)
-};
-extern const struct winfd INVALID_WINFD;
-
-int usbi_pipe(int pipefd[2]);
-int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout);
-ssize_t usbi_write(int fd, const void *buf, size_t count);
-ssize_t usbi_read(int fd, void *buf, size_t count);
-int usbi_close(int fd);
-
-void init_polling(void);
-void exit_polling(void);
-struct winfd usbi_create_fd(HANDLE handle, int access_mode, 
-	struct usbi_transfer *transfer, cancel_transfer *cancel_fn);
-void usbi_free_fd(struct winfd* winfd);
-struct winfd fd_to_winfd(int fd);
-struct winfd handle_to_winfd(HANDLE handle);
-struct winfd overlapped_to_winfd(OVERLAPPED* overlapped);
-
-/*
- * Timeval operations
- */
-#if defined(DDKBUILD)
-#include <winsock.h>	// defines timeval functions on DDK
-#endif
-
-#if !defined(TIMESPEC_TO_TIMEVAL)
-#define TIMESPEC_TO_TIMEVAL(tv, ts) {                   \
-	(tv)->tv_sec = (long)(ts)->tv_sec;                  \
-	(tv)->tv_usec = (long)(ts)->tv_nsec / 1000;         \
-}
-#endif
-#if !defined(timersub)
-#define timersub(a, b, result)                          \
-do {                                                    \
-	(result)->tv_sec = (a)->tv_sec - (b)->tv_sec;       \
-	(result)->tv_usec = (a)->tv_usec - (b)->tv_usec;    \
-	if ((result)->tv_usec < 0) {                        \
-		--(result)->tv_sec;                             \
-		(result)->tv_usec += 1000000;                   \
-	}                                                   \
-} while (0)
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_posix.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_posix.c
deleted file mode 100644
index 9769f58367..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_posix.c
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
- * libusbx synchronization using POSIX Threads
- *
- * Copyright © 2011 Vitali Lovich <vlovich@aliph.com>
- * Copyright © 2011 Peter Stuge <peter@stuge.se>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#if defined(__linux__) || defined(__OpenBSD__)
-# if defined(__linux__)
-#  define _GNU_SOURCE
-# else
-#  define _BSD_SOURCE
-# endif
-# include <unistd.h>
-# include <sys/syscall.h>
-#elif defined(__APPLE__)
-# include <mach/mach.h>
-#elif defined(__CYGWIN__)
-# include <windows.h>
-#endif
-
-#include "threads_posix.h"
-
-int usbi_mutex_init_recursive(pthread_mutex_t *mutex, pthread_mutexattr_t *attr)
-{
-	int err;
-	pthread_mutexattr_t stack_attr;
-	if (!attr) {
-		attr = &stack_attr;
-		err = pthread_mutexattr_init(&stack_attr);
-		if (err != 0)
-			return err;
-	}
-
-	/* mutexattr_settype requires _GNU_SOURCE or _XOPEN_SOURCE >= 500 on Linux */
-	err = pthread_mutexattr_settype(attr, PTHREAD_MUTEX_RECURSIVE);
-	if (err != 0)
-		goto finish;
-
-	err = pthread_mutex_init(mutex, attr);
-
-finish:
-	if (attr == &stack_attr)
-		pthread_mutexattr_destroy(&stack_attr);
-
-	return err;
-}
-
-int usbi_get_tid(void)
-{
-	int ret = -1;
-#if defined(__linux__)
-	ret = syscall(SYS_gettid);
-#elif defined(__OpenBSD__)
-	/* The following only works with OpenBSD > 5.1 as it requires
-	   real thread support. For 5.1 and earlier, -1 is returned. */
-	ret = syscall(SYS_getthrid);
-#elif defined(__APPLE__)
-	ret = mach_thread_self();
-	mach_port_deallocate(mach_task_self(), ret);
-#elif defined(__CYGWIN__)
-	ret = GetCurrentThreadId();
-#endif
-/* TODO: NetBSD thread ID support */
-	return ret;
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_posix.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_posix.h
deleted file mode 100644
index 0b6a71a552..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_posix.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * libusbx synchronization using POSIX Threads
- *
- * Copyright © 2010 Peter Stuge <peter@stuge.se>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef LIBUSB_THREADS_POSIX_H
-#define LIBUSB_THREADS_POSIX_H
-
-#include <pthread.h>
-
-#define usbi_mutex_static_t		pthread_mutex_t
-#define USBI_MUTEX_INITIALIZER		PTHREAD_MUTEX_INITIALIZER
-#define usbi_mutex_static_lock		pthread_mutex_lock
-#define usbi_mutex_static_unlock	pthread_mutex_unlock
-
-#define usbi_mutex_t			pthread_mutex_t
-#define usbi_mutex_init			pthread_mutex_init
-#define usbi_mutex_lock			pthread_mutex_lock
-#define usbi_mutex_unlock		pthread_mutex_unlock
-#define usbi_mutex_trylock		pthread_mutex_trylock
-#define usbi_mutex_destroy		pthread_mutex_destroy
-
-#define usbi_cond_t			pthread_cond_t
-#define usbi_cond_init			pthread_cond_init
-#define usbi_cond_wait			pthread_cond_wait
-#define usbi_cond_timedwait		pthread_cond_timedwait
-#define usbi_cond_broadcast		pthread_cond_broadcast
-#define usbi_cond_destroy		pthread_cond_destroy
-#define usbi_cond_signal		pthread_cond_signal
-
-extern int usbi_mutex_init_recursive(pthread_mutex_t *mutex, pthread_mutexattr_t *attr);
-
-int usbi_get_tid(void);
-
-#endif /* LIBUSB_THREADS_POSIX_H */
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_windows.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_windows.c
deleted file mode 100644
index cad27e9ea0..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_windows.c
+++ /dev/null
@@ -1,212 +0,0 @@
-/*
- * libusbx synchronization on Microsoft Windows
- *
- * Copyright © 2010 Michael Plante <michael.plante@gmail.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <config.h>
-#include <objbase.h>
-#include <errno.h>
-#include <stdarg.h>
-
-#include "libusbi.h"
-
-extern const uint64_t epoch_time;
-
-int usbi_mutex_init(usbi_mutex_t *mutex,
-					const usbi_mutexattr_t *attr) {
-	UNUSED(attr);
-	if(! mutex) return ((errno=EINVAL));
-	*mutex = CreateMutex(NULL, FALSE, NULL);
-	if(!*mutex) return ((errno=ENOMEM));
-	return 0;
-}
-int usbi_mutex_destroy(usbi_mutex_t *mutex) {
-	// It is not clear if CloseHandle failure is due to failure to unlock.
-	//   If so, this should be errno=EBUSY.
-	if(!mutex || !CloseHandle(*mutex)) return ((errno=EINVAL));
-	*mutex = NULL;
-	return 0;
-}
-int usbi_mutex_trylock(usbi_mutex_t *mutex) {
-	DWORD result;
-	if(!mutex) return ((errno=EINVAL));
-	result = WaitForSingleObject(*mutex, 0);
-	if(result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
-		return 0; // acquired (ToDo: check that abandoned is ok)
-	if(result == WAIT_TIMEOUT)
-		return ((errno=EBUSY));
-	return ((errno=EINVAL)); // don't know how this would happen
-							 //   so don't know proper errno
-}
-int usbi_mutex_lock(usbi_mutex_t *mutex) {
-	DWORD result;
-	if(!mutex) return ((errno=EINVAL));
-	result = WaitForSingleObject(*mutex, INFINITE);
-	if(result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
-		return 0; // acquired (ToDo: check that abandoned is ok)
-	return ((errno=EINVAL)); // don't know how this would happen
-							 //   so don't know proper errno
-}
-int usbi_mutex_unlock(usbi_mutex_t *mutex) {
-	if(!mutex)                return ((errno=EINVAL));
-	if(!ReleaseMutex(*mutex)) return ((errno=EPERM ));
-	return 0;
-}
-
-int usbi_mutex_static_lock(usbi_mutex_static_t *mutex) {
-	if(!mutex)               return ((errno=EINVAL));
-	while (InterlockedExchange((LONG *)mutex, 1) == 1) {
-		SleepEx(0, TRUE);
-	}
-	return 0;
-}
-int usbi_mutex_static_unlock(usbi_mutex_static_t *mutex) {
-	if(!mutex)               return ((errno=EINVAL));
-	*mutex = 0;
-	return 0;
-}
-
-int usbi_cond_init(usbi_cond_t *cond,
-				   const usbi_condattr_t *attr) {
-	UNUSED(attr);
-	if(!cond)           return ((errno=EINVAL));
-	list_init(&cond->waiters    );
-	list_init(&cond->not_waiting);
-	return 0;
-}
-int usbi_cond_destroy(usbi_cond_t *cond) {
-	// This assumes no one is using this anymore.  The check MAY NOT BE safe.
-	struct usbi_cond_perthread *pos, *next_pos = NULL;
-	if(!cond) return ((errno=EINVAL));
-	if(!list_empty(&cond->waiters)) return ((errno=EBUSY )); // (!see above!)
-	list_for_each_entry_safe(pos, next_pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
-		CloseHandle(pos->event);
-		list_del(&pos->list);
-		free(pos);
-	}
-
-	return 0;
-}
-
-int usbi_cond_broadcast(usbi_cond_t *cond) {
-	// Assumes mutex is locked; this is not in keeping with POSIX spec, but
-	//   libusb does this anyway, so we simplify by not adding more sync
-	//   primitives to the CV definition!
-	int fail = 0;
-	struct usbi_cond_perthread *pos;
-	if(!cond)                      return ((errno=EINVAL));
-	list_for_each_entry(pos, &cond->waiters, list, struct usbi_cond_perthread) {
-		if(!SetEvent(pos->event))
-			fail = 1;
-	}
-	// The wait function will remove its respective item from the list.
-	return fail ? ((errno=EINVAL)) : 0;
-}
-int usbi_cond_signal(usbi_cond_t *cond) {
-	// Assumes mutex is locked; this is not in keeping with POSIX spec, but
-	//   libusb does this anyway, so we simplify by not adding more sync
-	//   primitives to the CV definition!
-	struct usbi_cond_perthread *pos;
-	if(!cond)                      return ((errno=EINVAL));
-	if(list_empty(&cond->waiters)) return 0; // no one to wakeup.
-	pos = list_entry(&cond->waiters.next, struct usbi_cond_perthread, list);
-	// The wait function will remove its respective item from the list.
-	return SetEvent(pos->event) ? 0 : ((errno=EINVAL));
-}
-__inline static int usbi_cond_intwait(usbi_cond_t *cond,
-									  usbi_mutex_t *mutex,
-									  DWORD timeout_ms) {
-	struct usbi_cond_perthread *pos;
-	int found = 0, r;
-	DWORD r2,tid = GetCurrentThreadId();
-	if(!cond || !mutex) return ((errno=EINVAL));
-	list_for_each_entry(pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
-		if(tid == pos->tid) {
-			found = 1;
-			break;
-		}
-	}
-	if(!found) {
-		pos      = (struct usbi_cond_perthread*) calloc(1, sizeof(struct usbi_cond_perthread));
-		if(!pos) return ((errno=ENOMEM)); // This errno is not POSIX-allowed.
-		pos->tid = tid;
-		pos->event = CreateEvent(NULL, FALSE, FALSE, NULL); // auto-reset.
-		if(!pos->event) {
-			free(pos);
-			return      ((errno=ENOMEM));
-		}
-		list_add(&pos->list, &cond->not_waiting);
-	}
-
-	list_del(&pos->list); // remove from not_waiting list.
-	list_add(&pos->list, &cond->waiters);
-
-	r  = usbi_mutex_unlock(mutex);
-	if(r) return r;
-	r2 = WaitForSingleObject(pos->event, timeout_ms);
-	r  = usbi_mutex_lock(mutex);
-	if(r) return r;
-
-	list_del(&pos->list);
-	list_add(&pos->list, &cond->not_waiting);
-
-	if(r2 == WAIT_TIMEOUT) return ((errno=ETIMEDOUT));
-
-	return 0;
-}
-// N.B.: usbi_cond_*wait() can also return ENOMEM, even though pthread_cond_*wait cannot!
-int usbi_cond_wait(usbi_cond_t *cond, usbi_mutex_t *mutex) {
-	return usbi_cond_intwait(cond, mutex, INFINITE);
-}
-int usbi_cond_timedwait(usbi_cond_t *cond,
-						usbi_mutex_t *mutex,
-						const struct timespec *abstime) {
-	FILETIME filetime;
-	ULARGE_INTEGER rtime;
-	struct timeval targ_time, cur_time, delta_time;
-	struct timespec cur_time_ns;
-	DWORD millis;
-
-	// GetSystemTimeAsFileTime() is not available on CE
-	SYSTEMTIME st;
-	GetSystemTime(&st);
-	SystemTimeToFileTime(&st, &filetime);
-	rtime.LowPart   = filetime.dwLowDateTime;
-	rtime.HighPart  = filetime.dwHighDateTime;
-	rtime.QuadPart -= epoch_time;
-	cur_time_ns.tv_sec = (long)(rtime.QuadPart / 10000000);
-	cur_time_ns.tv_nsec = (long)((rtime.QuadPart % 10000000)*100);
-	TIMESPEC_TO_TIMEVAL(&cur_time, &cur_time_ns);
-
-	TIMESPEC_TO_TIMEVAL(&targ_time, abstime);
-	timersub(&targ_time, &cur_time, &delta_time);
-	if(delta_time.tv_sec < 0) // abstime already passed?
-		millis = 0;
-	else {
-		millis  = delta_time.tv_usec/1000;
-		millis += delta_time.tv_sec *1000;
-		if (delta_time.tv_usec % 1000) // round up to next millisecond
-			millis++;
-	}
-
-	return usbi_cond_intwait(cond, mutex, millis);
-}
-
-int usbi_get_tid(void) {
-	return GetCurrentThreadId();
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_windows.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_windows.h
deleted file mode 100644
index df8a0eeb03..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/threads_windows.h
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * libusbx synchronization on Microsoft Windows
- *
- * Copyright © 2010 Michael Plante <michael.plante@gmail.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef LIBUSB_THREADS_WINDOWS_H
-#define LIBUSB_THREADS_WINDOWS_H
-
-#define usbi_mutex_static_t     volatile LONG
-#define USBI_MUTEX_INITIALIZER  0
-
-#define usbi_mutex_t            HANDLE
-
-struct usbi_cond_perthread {
-	struct list_head list;
-	DWORD            tid;
-	HANDLE           event;
-};
-struct usbi_cond_t_ {
-	// Every time a thread touches the CV, it winds up in one of these lists.
-	//   It stays there until the CV is destroyed, even if the thread
-	//   terminates.
-	struct list_head waiters;
-	struct list_head not_waiting;
-};
-typedef struct usbi_cond_t_ usbi_cond_t;
-
-// We *were* getting timespec from pthread.h:
-#if (!defined(HAVE_STRUCT_TIMESPEC) && !defined(_TIMESPEC_DEFINED))
-#define HAVE_STRUCT_TIMESPEC 1
-#define _TIMESPEC_DEFINED 1
-struct timespec {
-		long tv_sec;
-		long tv_nsec;
-};
-#endif /* HAVE_STRUCT_TIMESPEC | _TIMESPEC_DEFINED */
-
-// We *were* getting ETIMEDOUT from pthread.h:
-#ifndef ETIMEDOUT
-#  define ETIMEDOUT 10060     /* This is the value in winsock.h. */
-#endif
-
-#define usbi_mutexattr_t void
-#define usbi_condattr_t  void
-
-// all Windows mutexes are recursive
-#define usbi_mutex_init_recursive(mutex, attr) usbi_mutex_init((mutex), (attr))
-
-int usbi_mutex_static_lock(usbi_mutex_static_t *mutex);
-int usbi_mutex_static_unlock(usbi_mutex_static_t *mutex);
-
-
-int usbi_mutex_init(usbi_mutex_t *mutex,
-					const usbi_mutexattr_t *attr);
-int usbi_mutex_lock(usbi_mutex_t *mutex);
-int usbi_mutex_unlock(usbi_mutex_t *mutex);
-int usbi_mutex_trylock(usbi_mutex_t *mutex);
-int usbi_mutex_destroy(usbi_mutex_t *mutex);
-
-int usbi_cond_init(usbi_cond_t *cond,
-				   const usbi_condattr_t *attr);
-int usbi_cond_destroy(usbi_cond_t *cond);
-int usbi_cond_wait(usbi_cond_t *cond, usbi_mutex_t *mutex);
-int usbi_cond_timedwait(usbi_cond_t *cond,
-						usbi_mutex_t *mutex,
-						const struct timespec *abstime);
-int usbi_cond_broadcast(usbi_cond_t *cond);
-int usbi_cond_signal(usbi_cond_t *cond);
-
-int usbi_get_tid(void);
-
-#endif /* LIBUSB_THREADS_WINDOWS_H */
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/wince_usb.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/wince_usb.c
deleted file mode 100644
index e4a66331e5..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/wince_usb.c
+++ /dev/null
@@ -1,1015 +0,0 @@
-/*
- * Windows CE backend for libusbx 1.0
- * Copyright © 2011-2013 RealVNC Ltd.
- * Large portions taken from Windows backend, which is
- * Copyright © 2009-2010 Pete Batard <pbatard@gmail.com>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
- * Major code testing contribution by Xiaofan Chen
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <libusbi.h>
-
-#include <stdint.h>
-#include <errno.h>
-#include <inttypes.h>
-
-#include "wince_usb.h"
-
-// Forward declares
-static int wince_clock_gettime(int clk_id, struct timespec *tp);
-unsigned __stdcall wince_clock_gettime_threaded(void* param);
-
-// Global variables
-uint64_t hires_frequency, hires_ticks_to_ps;
-int errno;
-const uint64_t epoch_time = UINT64_C(116444736000000000);       // 1970.01.01 00:00:000 in MS Filetime
-enum windows_version windows_version = WINDOWS_CE;
-static int concurrent_usage = -1;
-// Timer thread
-// NB: index 0 is for monotonic and 1 is for the thread exit event
-HANDLE timer_thread = NULL;
-HANDLE timer_mutex = NULL;
-struct timespec timer_tp;
-volatile LONG request_count[2] = {0, 1};	// last one must be > 0
-HANDLE timer_request[2] = { NULL, NULL };
-HANDLE timer_response = NULL;
-HANDLE driver_handle = INVALID_HANDLE_VALUE;
-
-/*
- * Converts a windows error to human readable string
- * uses retval as errorcode, or, if 0, use GetLastError()
- */
-#if defined(ENABLE_LOGGING)
-static char* windows_error_str(uint32_t retval)
-{
-	static TCHAR wErr_string[ERR_BUFFER_SIZE];
-	static char err_string[ERR_BUFFER_SIZE];
-
-	DWORD size;
-	size_t i;
-	uint32_t error_code, format_error;
-
-	error_code = retval?retval:GetLastError();
-	
-	safe_stprintf(wErr_string, ERR_BUFFER_SIZE, _T("[%d] "), error_code);
-	
-	size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error_code,
-		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &wErr_string[safe_tcslen(wErr_string)],
-		ERR_BUFFER_SIZE - (DWORD)safe_tcslen(wErr_string), NULL);
-	if (size == 0) {
-		format_error = GetLastError();
-		if (format_error)
-			safe_stprintf(wErr_string, ERR_BUFFER_SIZE,
-				_T("Windows error code %u (FormatMessage error code %u)"), error_code, format_error);
-		else
-			safe_stprintf(wErr_string, ERR_BUFFER_SIZE, _T("Unknown error code %u"), error_code);
-	} else {
-		// Remove CR/LF terminators
-		for (i=safe_tcslen(wErr_string)-1; ((wErr_string[i]==0x0A) || (wErr_string[i]==0x0D)); i--) {
-			wErr_string[i] = 0;
-		}
-	}
-	if (WideCharToMultiByte(CP_ACP, 0, wErr_string, -1, err_string, ERR_BUFFER_SIZE, NULL, NULL) < 0)
-	{
-		strcpy(err_string, "Unable to convert error string");
-	}
-	return err_string;
-}
-#endif
-
-static struct wince_device_priv *_device_priv(struct libusb_device *dev)
-{
-        return (struct wince_device_priv *) dev->os_priv;
-}
-
-// ceusbkwrapper to libusb error code mapping
-static int translate_driver_error(int error) 
-{
-	switch (error) {
-		case ERROR_INVALID_PARAMETER:
-			return LIBUSB_ERROR_INVALID_PARAM;
-		case ERROR_CALL_NOT_IMPLEMENTED:
-		case ERROR_NOT_SUPPORTED:
-			return LIBUSB_ERROR_NOT_SUPPORTED;
-		case ERROR_NOT_ENOUGH_MEMORY:
-			return LIBUSB_ERROR_NO_MEM;
-		case ERROR_INVALID_HANDLE:
-			return LIBUSB_ERROR_NO_DEVICE;
-		case ERROR_BUSY:
-			return LIBUSB_ERROR_BUSY;
-
-		// Error codes that are either unexpected, or have 
-		// no suitable LIBUSB_ERROR equivilant.
-		case ERROR_CANCELLED:
-		case ERROR_INTERNAL_ERROR:
-		default:
-			return LIBUSB_ERROR_OTHER;
-	}
-}
-
-static int init_dllimports()
-{
-	DLL_LOAD(ceusbkwrapper.dll, UkwOpenDriver, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwGetDeviceList, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwReleaseDeviceList, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwGetDeviceAddress, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwGetDeviceDescriptor, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwGetConfigDescriptor, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwCloseDriver, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwCancelTransfer, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwIssueControlTransfer, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwClaimInterface, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwReleaseInterface, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwSetInterfaceAlternateSetting, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwClearHaltHost, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwClearHaltDevice, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwGetConfig, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwSetConfig, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwResetDevice, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwKernelDriverActive, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwAttachKernelDriver, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwDetachKernelDriver, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwIssueBulkTransfer, TRUE);
-	DLL_LOAD(ceusbkwrapper.dll, UkwIsPipeHalted, TRUE);
-	return LIBUSB_SUCCESS;
-}
-
-static int init_device(struct libusb_device *dev, UKW_DEVICE drv_dev,
-					   unsigned char bus_addr, unsigned char dev_addr)
-{
-	struct wince_device_priv *priv = _device_priv(dev);
-	int r = LIBUSB_SUCCESS;
-
-	dev->bus_number = bus_addr;
-	dev->device_address = dev_addr;
-	priv->dev = drv_dev;
-
-	if (!UkwGetDeviceDescriptor(priv->dev, &(priv->desc))) {
-		r = translate_driver_error(GetLastError());
-	}
-	return r;
-}
-
-// Internal API functions
-static int wince_init(struct libusb_context *ctx)
-{
-	int i, r = LIBUSB_ERROR_OTHER;
-	HANDLE semaphore;
-	TCHAR sem_name[11+1+8]; // strlen(libusb_init)+'\0'+(32-bit hex PID)
-
-	_stprintf(sem_name, _T("libusb_init%08X"), (unsigned int)GetCurrentProcessId()&0xFFFFFFFF);
-	semaphore = CreateSemaphore(NULL, 1, 1, sem_name);
-	if (semaphore == NULL) {
-		usbi_err(ctx, "could not create semaphore: %s", windows_error_str(0));
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	// A successful wait brings our semaphore count to 0 (unsignaled)
-	// => any concurent wait stalls until the semaphore's release
-	if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
-		usbi_err(ctx, "failure to access semaphore: %s", windows_error_str(0));
-		CloseHandle(semaphore);
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	// NB: concurrent usage supposes that init calls are equally balanced with
-	// exit calls. If init is called more than exit, we will not exit properly
-	if ( ++concurrent_usage == 0 ) {	// First init?
-		// Initialize pollable file descriptors
-		init_polling();
-
-		// Load DLL imports
-		if (init_dllimports() != LIBUSB_SUCCESS) {
-			usbi_err(ctx, "could not resolve DLL functions");
-			r = LIBUSB_ERROR_NOT_SUPPORTED;
-			goto init_exit;
-		}
-
-		// try to open a handle to the driver
-		driver_handle = UkwOpenDriver();
-		if (driver_handle == INVALID_HANDLE_VALUE) {
-			usbi_err(ctx, "could not connect to driver");
-			r = LIBUSB_ERROR_NOT_SUPPORTED;
-			goto init_exit;
-		}
-
-		// Windows CE doesn't have a way of specifying thread affinity, so this code
-		// just has  to hope QueryPerformanceCounter doesn't report different values when
-		// running on different cores.
-		r = LIBUSB_ERROR_NO_MEM;
-		for (i = 0; i < 2; i++) {
-			timer_request[i] = CreateEvent(NULL, TRUE, FALSE, NULL);
-			if (timer_request[i] == NULL) {
-				usbi_err(ctx, "could not create timer request event %d - aborting", i);
-				goto init_exit;
-			}
-		}
-		timer_response = CreateSemaphore(NULL, 0, MAX_TIMER_SEMAPHORES, NULL);
-		if (timer_response == NULL) {
-			usbi_err(ctx, "could not create timer response semaphore - aborting");
-			goto init_exit;
-		}
-		timer_mutex = CreateMutex(NULL, FALSE, NULL);
-		if (timer_mutex == NULL) {
-			usbi_err(ctx, "could not create timer mutex - aborting");
-			goto init_exit;
-		}
-		timer_thread = CreateThread(NULL, 0, wince_clock_gettime_threaded, NULL, 0, NULL);
-		if (timer_thread == NULL) {
-			usbi_err(ctx, "Unable to create timer thread - aborting");
-			goto init_exit;
-		}
-	}
-	// At this stage, either we went through full init successfully, or didn't need to
-	r = LIBUSB_SUCCESS;
-
-init_exit: // Holds semaphore here.
-	if (!concurrent_usage && r != LIBUSB_SUCCESS) { // First init failed?
-		if (driver_handle != INVALID_HANDLE_VALUE) {
-			UkwCloseDriver(driver_handle);
-			driver_handle = INVALID_HANDLE_VALUE;
-		}
-		if (timer_thread) {
-			SetEvent(timer_request[1]); // actually the signal to quit the thread.
-			if (WAIT_OBJECT_0 != WaitForSingleObject(timer_thread, INFINITE)) {
-				usbi_warn(ctx, "could not wait for timer thread to quit");
-				TerminateThread(timer_thread, 1); // shouldn't happen, but we're destroying
-												  // all objects it might have held anyway.
-			}
-			CloseHandle(timer_thread);
-			timer_thread = NULL;
-		}
-		for (i = 0; i < 2; i++) {
-			if (timer_request[i]) {
-				CloseHandle(timer_request[i]);
-				timer_request[i] = NULL;
-			}
-		}
-		if (timer_response) {
-			CloseHandle(timer_response);
-			timer_response = NULL;
-		}
-		if (timer_mutex) {
-			CloseHandle(timer_mutex);
-			timer_mutex = NULL;
-		}
-	}
-
-	if (r != LIBUSB_SUCCESS)
-		--concurrent_usage; // Not expected to call libusb_exit if we failed.
-
-	ReleaseSemaphore(semaphore, 1, NULL);	// increase count back to 1
-	CloseHandle(semaphore);
-	return r;
-}
-
-static void wince_exit(void)
-{
-	int i;
-	HANDLE semaphore;
-	TCHAR sem_name[11+1+8]; // strlen(libusb_init)+'\0'+(32-bit hex PID)
-
-	_stprintf(sem_name, _T("libusb_init%08X"), (unsigned int)GetCurrentProcessId()&0xFFFFFFFF);
-	semaphore = CreateSemaphore(NULL, 1, 1, sem_name);
-	if (semaphore == NULL) {
-		return;
-	}
-
-	// A successful wait brings our semaphore count to 0 (unsignaled)
-	// => any concurent wait stalls until the semaphore release
-	if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
-		CloseHandle(semaphore);
-		return;
-	}
-
-	// Only works if exits and inits are balanced exactly
-	if (--concurrent_usage < 0) {	// Last exit
-		exit_polling();
-
-		if (timer_thread) {
-			SetEvent(timer_request[1]); // actually the signal to quit the thread.
-			if (WAIT_OBJECT_0 != WaitForSingleObject(timer_thread, INFINITE)) {
-				usbi_dbg("could not wait for timer thread to quit");
-				TerminateThread(timer_thread, 1);
-			}
-			CloseHandle(timer_thread);
-			timer_thread = NULL;
-		}
-		for (i = 0; i < 2; i++) {
-			if (timer_request[i]) {
-				CloseHandle(timer_request[i]);
-				timer_request[i] = NULL;
-			}
-		}
-		if (timer_response) {
-			CloseHandle(timer_response);
-			timer_response = NULL;
-		}
-		if (timer_mutex) {
-			CloseHandle(timer_mutex);
-			timer_mutex = NULL;
-		}
-		if (driver_handle != INVALID_HANDLE_VALUE) {
-			UkwCloseDriver(driver_handle);
-			driver_handle = INVALID_HANDLE_VALUE;
-		}
-	}
-
-	ReleaseSemaphore(semaphore, 1, NULL);	// increase count back to 1
-	CloseHandle(semaphore);
-}
-
-static int wince_get_device_list(
-	struct libusb_context *ctx,
-	struct discovered_devs **discdevs)
-{
-	UKW_DEVICE devices[MAX_DEVICE_COUNT];
-	struct discovered_devs * new_devices = *discdevs;
-	DWORD count = 0, i;
-	struct libusb_device *dev = NULL;
-	unsigned char bus_addr, dev_addr;
-	unsigned long session_id;
-	BOOL success;
-	DWORD release_list_offset = 0;
-	int r = LIBUSB_SUCCESS;
-
-	success = UkwGetDeviceList(driver_handle, devices, MAX_DEVICE_COUNT, &count);
-	if (!success) {
-		int libusbErr = translate_driver_error(GetLastError());
-		usbi_err(ctx, "could not get devices: %s", windows_error_str(0));
-		return libusbErr;
-	}
-	for(i = 0; i < count; ++i) {
-		release_list_offset = i;
-		success = UkwGetDeviceAddress(devices[i], &bus_addr, &dev_addr, &session_id);
-		if (!success) {
-			r = translate_driver_error(GetLastError());
-			usbi_err(ctx, "could not get device address for %d: %s", i, windows_error_str(0));
-			goto err_out;
-		}
-		dev = usbi_get_device_by_session_id(ctx, session_id);
-		if (dev) {
-			usbi_dbg("using existing device for %d/%d (session %ld)",
-					bus_addr, dev_addr, session_id);
-			libusb_ref_device(dev);
-			// Release just this element in the device list (as we already hold a 
-			// reference to it).
-			UkwReleaseDeviceList(driver_handle, &devices[i], 1);
-			release_list_offset++;
-		} else {
-			usbi_dbg("allocating new device for %d/%d (session %ld)",
-					bus_addr, dev_addr, session_id);
-			dev = usbi_alloc_device(ctx, session_id);
-			if (!dev) {
-				r = LIBUSB_ERROR_NO_MEM;
-				goto err_out;
-			}
-			r = init_device(dev, devices[i], bus_addr, dev_addr);
-			if (r < 0)
-				goto err_out;
-			r = usbi_sanitize_device(dev);
-			if (r < 0)
-				goto err_out;
-		}
-		new_devices = discovered_devs_append(new_devices, dev);
-		if (!discdevs) {
-			r = LIBUSB_ERROR_NO_MEM;
-			goto err_out;
-		}
-		safe_unref_device(dev);
-	}
-	*discdevs = new_devices;
-	return r;
-err_out:
-	*discdevs = new_devices;
-	safe_unref_device(dev);
-	// Release the remainder of the unprocessed device list.
-	// The devices added to new_devices already will still be passed up to libusb, 
-	// which can dispose of them at its leisure.
-	UkwReleaseDeviceList(driver_handle, &devices[release_list_offset], count - release_list_offset);
-	return r;
-}
-
-static int wince_open(struct libusb_device_handle *handle)
-{
-	// Nothing to do to open devices as a handle to it has
-	// been retrieved by wince_get_device_list
-	return LIBUSB_SUCCESS;
-}
-
-static void wince_close(struct libusb_device_handle *handle)
-{
-	// Nothing to do as wince_open does nothing.
-}
-
-static int wince_get_device_descriptor(
-   struct libusb_device *device,
-   unsigned char *buffer, int *host_endian)
-{
-	struct wince_device_priv *priv = _device_priv(device);
-
-	*host_endian = 1;
-	memcpy(buffer, &priv->desc, DEVICE_DESC_LENGTH);
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_get_active_config_descriptor(
-	struct libusb_device *device,
-	unsigned char *buffer, size_t len, int *host_endian)
-{
-	struct wince_device_priv *priv = _device_priv(device);
-	DWORD actualSize = len;
-	*host_endian = 0;
-	if (!UkwGetConfigDescriptor(priv->dev, UKW_ACTIVE_CONFIGURATION, buffer, len, &actualSize)) {
-		return translate_driver_error(GetLastError());
-	}
-	return actualSize;
-}
-
-static int wince_get_config_descriptor(
-	struct libusb_device *device,
-	uint8_t config_index,
-	unsigned char *buffer, size_t len, int *host_endian)
-{
-	struct wince_device_priv *priv = _device_priv(device);
-	DWORD actualSize = len;
-	*host_endian = 0;
-	if (!UkwGetConfigDescriptor(priv->dev, config_index, buffer, len, &actualSize)) {
-		return translate_driver_error(GetLastError());
-	}
-	return actualSize;
-}
-
-static int wince_get_configuration(
-   struct libusb_device_handle *handle,
-   int *config)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	UCHAR cv = 0;
-	if (!UkwGetConfig(priv->dev, &cv)) {
-		return translate_driver_error(GetLastError());
-	}
-	(*config) = cv;
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_set_configuration(
-	struct libusb_device_handle *handle,
-	int config)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	// Setting configuration 0 places the device in Address state.
-	// This should correspond to the "unconfigured state" required by
-	// libusb when the specified configuration is -1.
-	UCHAR cv = (config < 0) ? 0 : config;
-	if (!UkwSetConfig(priv->dev, cv)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_claim_interface(
-	struct libusb_device_handle *handle,
-	int interface_number)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwClaimInterface(priv->dev, interface_number)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_release_interface(
-	struct libusb_device_handle *handle,
-	int interface_number)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwSetInterfaceAlternateSetting(priv->dev, interface_number, 0)) {
-		return translate_driver_error(GetLastError());
-	}
-	if (!UkwReleaseInterface(priv->dev, interface_number)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_set_interface_altsetting(
-	struct libusb_device_handle *handle,
-	int interface_number, int altsetting)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwSetInterfaceAlternateSetting(priv->dev, interface_number, altsetting)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_clear_halt(
-	struct libusb_device_handle *handle,
-	unsigned char endpoint)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwClearHaltHost(priv->dev, endpoint)) {
-		return translate_driver_error(GetLastError());
-	}
-	if (!UkwClearHaltDevice(priv->dev, endpoint)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_reset_device(
-	struct libusb_device_handle *handle)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwResetDevice(priv->dev)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_kernel_driver_active(
-	struct libusb_device_handle *handle,
-	int interface_number)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	BOOL result = FALSE;
-	if (!UkwKernelDriverActive(priv->dev, interface_number, &result)) {
-		return translate_driver_error(GetLastError());
-	}
-	return result ? 1 : 0;
-}
-
-static int wince_detach_kernel_driver(
-	struct libusb_device_handle *handle,
-	int interface_number)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwDetachKernelDriver(priv->dev, interface_number)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_attach_kernel_driver(
-	struct libusb_device_handle *handle,
-	int interface_number)
-{
-	struct wince_device_priv *priv = _device_priv(handle->dev);
-	if (!UkwAttachKernelDriver(priv->dev, interface_number)) {
-		return translate_driver_error(GetLastError());
-	}	
-	return LIBUSB_SUCCESS;
-}
-
-static void wince_destroy_device(
-	struct libusb_device *dev)
-{
-	struct wince_device_priv *priv = _device_priv(dev);
-	UkwReleaseDeviceList(driver_handle, &priv->dev, 1);
-}
-
-static void wince_clear_transfer_priv(
-	struct usbi_transfer *itransfer)
-{
-	struct wince_transfer_priv *transfer_priv = (struct wince_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct winfd wfd = fd_to_winfd(transfer_priv->pollable_fd.fd);
-	// No need to cancel transfer as it is either complete or abandoned
-	wfd.itransfer = NULL;
-	CloseHandle(wfd.handle);
-	usbi_free_fd(&transfer_priv->pollable_fd);
-}
-
-static int wince_cancel_transfer(
-	struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	struct wince_transfer_priv *transfer_priv = (struct wince_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	
-	if (!UkwCancelTransfer(priv->dev, transfer_priv->pollable_fd.overlapped, UKW_TF_NO_WAIT)) {
-		return translate_driver_error(GetLastError());
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_submit_control_or_bulk_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct wince_transfer_priv *transfer_priv = (struct wince_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	BOOL direction_in, ret;
-	struct winfd wfd;
-	DWORD flags;
-	HANDLE eventHandle;
-	PUKW_CONTROL_HEADER setup = NULL;
-	const BOOL control_transfer = transfer->type == LIBUSB_TRANSFER_TYPE_CONTROL;
-
-	transfer_priv->pollable_fd = INVALID_WINFD;
-	if (control_transfer) {
-		setup = (PUKW_CONTROL_HEADER) transfer->buffer;
-		direction_in = setup->bmRequestType & LIBUSB_ENDPOINT_IN;
-	} else {
-		direction_in = transfer->endpoint & LIBUSB_ENDPOINT_IN;
-	}
-	flags = direction_in ? UKW_TF_IN_TRANSFER : UKW_TF_OUT_TRANSFER;
-	flags |= UKW_TF_SHORT_TRANSFER_OK;
-
-	eventHandle = CreateEvent(NULL, FALSE, FALSE, NULL);
-	if (eventHandle == NULL) {
-		usbi_err(ctx, "Failed to create event for async transfer");
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	wfd = usbi_create_fd(eventHandle, direction_in ? RW_READ : RW_WRITE, itransfer, &wince_cancel_transfer);
-	if (wfd.fd < 0) {
-		CloseHandle(eventHandle);
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	transfer_priv->pollable_fd = wfd;
-	if (control_transfer) {
-		// Split out control setup header and data buffer
-		DWORD bufLen = transfer->length - sizeof(UKW_CONTROL_HEADER);
-		PVOID buf = (PVOID) &transfer->buffer[sizeof(UKW_CONTROL_HEADER)];
-
-		ret = UkwIssueControlTransfer(priv->dev, flags, setup, buf, bufLen, &transfer->actual_length, wfd.overlapped);
-	} else {
-		ret = UkwIssueBulkTransfer(priv->dev, flags, transfer->endpoint, transfer->buffer, 
-			transfer->length, &transfer->actual_length, wfd.overlapped);
-	}
-	if (!ret) {
-		int libusbErr = translate_driver_error(GetLastError());
-		usbi_err(ctx, "UkwIssue%sTransfer failed: error %d",
-			control_transfer ? "Control" : "Bulk", GetLastError());
-		wince_clear_transfer_priv(itransfer);
-		return libusbErr;
-	}
-	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, direction_in ? POLLIN : POLLOUT);
-	itransfer->flags |= USBI_TRANSFER_UPDATED_FDS;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int wince_submit_iso_transfer(struct usbi_transfer *itransfer)
-{
-	return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static int wince_submit_transfer(
-	struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-		return wince_submit_control_or_bulk_transfer(itransfer);
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		return wince_submit_iso_transfer(itransfer);
-	default:
-		usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-}
-
-static void wince_transfer_callback(struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct wince_transfer_priv *transfer_priv = (struct wince_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int status;
-
-	usbi_dbg("handling I/O completion with errcode %d", io_result);
-
-	if (io_result == ERROR_NOT_SUPPORTED && 
-		transfer->type != LIBUSB_TRANSFER_TYPE_CONTROL) {
-		/* For functional stalls, the WinCE USB layer (and therefore the USB Kernel Wrapper 
-		 * Driver) will report USB_ERROR_STALL/ERROR_NOT_SUPPORTED in situations where the 
-		 * endpoint isn't actually stalled.
-		 *
-		 * One example of this is that some devices will occasionally fail to reply to an IN
-		 * token. The WinCE USB layer carries on with the transaction until it is completed
-		 * (or cancelled) but then completes it with USB_ERROR_STALL.
-		 *
-		 * This code therefore needs to confirm that there really is a stall error, by both
-		 * checking the pipe status and requesting the endpoint status from the device.
-		 */
-		BOOL halted = FALSE;
-		usbi_dbg("checking I/O completion with errcode ERROR_NOT_SUPPORTED is really a stall");
-		if (UkwIsPipeHalted(priv->dev, transfer->endpoint, &halted)) {
-			/* Pipe status retrieved, so now request endpoint status by sending a GET_STATUS
-			 * control request to the device. This is done synchronously, which is a bit 
-			 * naughty, but this is a special corner case.
-			 */
-			WORD wStatus = 0;
-			DWORD written = 0;
-			UKW_CONTROL_HEADER ctrlHeader;
-			ctrlHeader.bmRequestType = LIBUSB_REQUEST_TYPE_STANDARD |
-				LIBUSB_ENDPOINT_IN | LIBUSB_RECIPIENT_ENDPOINT;
-			ctrlHeader.bRequest = LIBUSB_REQUEST_GET_STATUS;
-			ctrlHeader.wValue = 0;
-			ctrlHeader.wIndex = transfer->endpoint;
-			ctrlHeader.wLength = sizeof(wStatus);
-			if (UkwIssueControlTransfer(priv->dev,
-					UKW_TF_IN_TRANSFER | UKW_TF_SEND_TO_ENDPOINT,
-					&ctrlHeader, &wStatus, sizeof(wStatus), &written, NULL)) {
-				if (written == sizeof(wStatus) &&
-						(wStatus & STATUS_HALT_FLAG) == 0) {
-					if (!halted || UkwClearHaltHost(priv->dev, transfer->endpoint)) {
-						usbi_dbg("Endpoint doesn't appear to be stalled, overriding error with success");
-						io_result = ERROR_SUCCESS;
-					} else {
-						usbi_dbg("Endpoint doesn't appear to be stalled, but the host is halted, changing error");
-						io_result = ERROR_IO_DEVICE;
-					}
-				}
-			}
-		}
-	}
-
-	switch(io_result) {
-	case ERROR_SUCCESS:
-		itransfer->transferred += io_size;
-		status = LIBUSB_TRANSFER_COMPLETED;
-		break;
-	case ERROR_CANCELLED:
-		usbi_dbg("detected transfer cancel");
-		status = LIBUSB_TRANSFER_CANCELLED;
-		break;
-	case ERROR_NOT_SUPPORTED:
-	case ERROR_GEN_FAILURE:
-		usbi_dbg("detected endpoint stall");
-		status = LIBUSB_TRANSFER_STALL;
-		break;
-	case ERROR_SEM_TIMEOUT:
-		usbi_dbg("detected semaphore timeout");
-		status = LIBUSB_TRANSFER_TIMED_OUT;
-		break;
-	case ERROR_OPERATION_ABORTED:
-		if (itransfer->flags & USBI_TRANSFER_TIMED_OUT) {
-			usbi_dbg("detected timeout");
-			status = LIBUSB_TRANSFER_TIMED_OUT;
-		} else {
-			usbi_dbg("detected operation aborted");
-			status = LIBUSB_TRANSFER_CANCELLED;
-		}
-		break;
-	default:
-		usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error: %s", windows_error_str(io_result));
-		status = LIBUSB_TRANSFER_ERROR;
-		break;
-	}
-	wince_clear_transfer_priv(itransfer);
-	if (status == LIBUSB_TRANSFER_CANCELLED) {
-		usbi_handle_transfer_cancellation(itransfer);
-	} else {
-		usbi_handle_transfer_completion(itransfer, (enum libusb_transfer_status)status);
-	}
-}
-
-static void wince_handle_callback (struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		wince_transfer_callback (itransfer, io_result, io_size);
-		break;
-	default:
-		usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
-	}
-}
-
-static int wince_handle_events(
-	struct libusb_context *ctx,
-	struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
-{
-	struct wince_transfer_priv* transfer_priv = NULL;
-	POLL_NFDS_TYPE i = 0;
-	BOOL found = FALSE;
-	struct usbi_transfer *transfer;
-	DWORD io_size, io_result;
-
-	usbi_mutex_lock(&ctx->open_devs_lock);
-	for (i = 0; i < nfds && num_ready > 0; i++) {
-
-		usbi_dbg("checking fd %d with revents = %04x", fds[i].fd, fds[i].revents);
-
-		if (!fds[i].revents) {
-			continue;
-		}
-
-		num_ready--;
-
-		// Because a Windows OVERLAPPED is used for poll emulation,
-		// a pollable fd is created and stored with each transfer
-		usbi_mutex_lock(&ctx->flying_transfers_lock);
-		list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
-			transfer_priv = usbi_transfer_get_os_priv(transfer);
-			if (transfer_priv->pollable_fd.fd == fds[i].fd) {
-				found = TRUE;
-				break;
-			}
-		}
-		usbi_mutex_unlock(&ctx->flying_transfers_lock);
-
-		if (found && HasOverlappedIoCompleted(transfer_priv->pollable_fd.overlapped)) {
-			io_result = (DWORD)transfer_priv->pollable_fd.overlapped->Internal;
-			io_size = (DWORD)transfer_priv->pollable_fd.overlapped->InternalHigh;
-			usbi_remove_pollfd(ctx, transfer_priv->pollable_fd.fd);
-			// let handle_callback free the event using the transfer wfd
-			// If you don't use the transfer wfd, you run a risk of trying to free a
-			// newly allocated wfd that took the place of the one from the transfer.
-			wince_handle_callback(transfer, io_result, io_size);
-		} else if (found) {
-			usbi_err(ctx, "matching transfer for fd %x has not completed", fds[i]);
-			return LIBUSB_ERROR_OTHER;
-		} else {
-			usbi_err(ctx, "could not find a matching transfer for fd %x", fds[i]);
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-	}
-
-	usbi_mutex_unlock(&ctx->open_devs_lock);
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * Monotonic and real time functions
- */
-unsigned __stdcall wince_clock_gettime_threaded(void* param)
-{
-	LARGE_INTEGER hires_counter, li_frequency;
-	LONG nb_responses;
-	int timer_index;
-
-	// Init - find out if we have access to a monotonic (hires) timer
-	if (!QueryPerformanceFrequency(&li_frequency)) {
-		usbi_dbg("no hires timer available on this platform");
-		hires_frequency = 0;
-		hires_ticks_to_ps = UINT64_C(0);
-	} else {
-		hires_frequency = li_frequency.QuadPart;
-		// The hires frequency can go as high as 4 GHz, so we'll use a conversion
-		// to picoseconds to compute the tv_nsecs part in clock_gettime
-		hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
-		usbi_dbg("hires timer available (Frequency: %"PRIu64" Hz)", hires_frequency);
-	}
-
-	// Main loop - wait for requests
-	while (1) {
-		timer_index = WaitForMultipleObjects(2, timer_request, FALSE, INFINITE) - WAIT_OBJECT_0;
-		if ( (timer_index != 0) && (timer_index != 1) ) {
-			usbi_dbg("failure to wait on requests: %s", windows_error_str(0));
-			continue;
-		}
-		if (request_count[timer_index] == 0) {
-			// Request already handled
-			ResetEvent(timer_request[timer_index]);
-			// There's still a possiblity that a thread sends a request between the
-			// time we test request_count[] == 0 and we reset the event, in which case
-			// the request would be ignored. The simple solution to that is to test
-			// request_count again and process requests if non zero.
-			if (request_count[timer_index] == 0)
-				continue;
-		}
-		switch (timer_index) {
-		case 0:
-			WaitForSingleObject(timer_mutex, INFINITE);
-			// Requests to this thread are for hires always
-			if (QueryPerformanceCounter(&hires_counter) != 0) {
-				timer_tp.tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
-				timer_tp.tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency)/1000) * hires_ticks_to_ps);
-			} else {
-				// Fallback to real-time if we can't get monotonic value
-				// Note that real-time clock does not wait on the mutex or this thread.
-				wince_clock_gettime(USBI_CLOCK_REALTIME, &timer_tp);
-			}
-			ReleaseMutex(timer_mutex);
-
-			nb_responses = InterlockedExchange((LONG*)&request_count[0], 0);
-			if ( (nb_responses)
-			  && (ReleaseSemaphore(timer_response, nb_responses, NULL) == 0) ) {
-				usbi_dbg("unable to release timer semaphore %d: %s", windows_error_str(0));
-			}
-			continue;
-		case 1: // time to quit
-			usbi_dbg("timer thread quitting");
-			return 0;
-		}
-	}
-	usbi_dbg("ERROR: broken timer thread");
-	return 1;
-}
-
-static int wince_clock_gettime(int clk_id, struct timespec *tp)
-{
-	FILETIME filetime;
-	ULARGE_INTEGER rtime;
-	DWORD r;
-	SYSTEMTIME st;
-	switch(clk_id) {
-	case USBI_CLOCK_MONOTONIC:
-		if (hires_frequency != 0) {
-			while (1) {
-				InterlockedIncrement((LONG*)&request_count[0]);
-				SetEvent(timer_request[0]);
-				r = WaitForSingleObject(timer_response, TIMER_REQUEST_RETRY_MS);
-				switch(r) {
-				case WAIT_OBJECT_0:
-					WaitForSingleObject(timer_mutex, INFINITE);
-					*tp = timer_tp;
-					ReleaseMutex(timer_mutex);
-					return LIBUSB_SUCCESS;
-				case WAIT_TIMEOUT:
-					usbi_dbg("could not obtain a timer value within reasonable timeframe - too much load?");
-					break; // Retry until successful
-				default:
-					usbi_dbg("WaitForSingleObject failed: %s", windows_error_str(0));
-					return LIBUSB_ERROR_OTHER;
-				}
-			}
-		}
-		// Fall through and return real-time if monotonic was not detected @ timer init
-	case USBI_CLOCK_REALTIME:
-		// We follow http://msdn.microsoft.com/en-us/library/ms724928%28VS.85%29.aspx
-		// with a predef epoch_time to have an epoch that starts at 1970.01.01 00:00
-		// Note however that our resolution is bounded by the Windows system time
-		// functions and is at best of the order of 1 ms (or, usually, worse)
-		GetSystemTime(&st);
-		SystemTimeToFileTime(&st, &filetime);
-		rtime.LowPart = filetime.dwLowDateTime;
-		rtime.HighPart = filetime.dwHighDateTime;
-		rtime.QuadPart -= epoch_time;
-		tp->tv_sec = (long)(rtime.QuadPart / 10000000);
-		tp->tv_nsec = (long)((rtime.QuadPart % 10000000)*100);
-		return LIBUSB_SUCCESS;
-	default:
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-}
-
-const struct usbi_os_backend wince_backend = {
-        "Windows CE",
-        0,
-        wince_init,
-        wince_exit,
-
-        wince_get_device_list,
-	NULL,				/* hotplug_poll */
-        wince_open,
-        wince_close,
-
-        wince_get_device_descriptor,
-        wince_get_active_config_descriptor,
-        wince_get_config_descriptor,
-	NULL,				/* get_config_descriptor_by_value() */
-
-        wince_get_configuration,
-        wince_set_configuration,
-        wince_claim_interface,
-        wince_release_interface,
-
-        wince_set_interface_altsetting,
-        wince_clear_halt,
-        wince_reset_device,
-
-        wince_kernel_driver_active,
-        wince_detach_kernel_driver,
-        wince_attach_kernel_driver,
-
-        wince_destroy_device,
-
-        wince_submit_transfer,
-        wince_cancel_transfer,
-        wince_clear_transfer_priv,
-
-        wince_handle_events,
-
-        wince_clock_gettime,
-        sizeof(struct wince_device_priv),
-        sizeof(struct wince_device_handle_priv),
-        sizeof(struct wince_transfer_priv),
-        0,
-};
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/wince_usb.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/wince_usb.h
deleted file mode 100644
index 3db9693a13..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/wince_usb.h
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * Windows CE backend for libusbx 1.0
- * Copyright © 2011-2013 RealVNC Ltd.
- * Portions taken from Windows backend, which is
- * Copyright © 2009-2010 Pete Batard <pbatard@gmail.com>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
- * Major code testing contribution by Xiaofan Chen
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#pragma once
-
-#include "windows_common.h"
-
-#include <windows.h>
-#include "poll_windows.h"
-
-#define MAX_DEVICE_COUNT            256
-
-// This is a modified dump of the types in the ceusbkwrapper.h library header
-// with functions transformed into extern pointers.
-//
-// This backend dynamically loads ceusbkwrapper.dll and doesn't include
-// ceusbkwrapper.h directly to simplify the build process. The kernel
-// side wrapper driver is built using the platform image build tools,
-// which makes it difficult to reference directly from the libusbx build
-// system.
-struct UKW_DEVICE_PRIV;
-typedef struct UKW_DEVICE_PRIV *UKW_DEVICE;
-typedef UKW_DEVICE *PUKW_DEVICE, *LPUKW_DEVICE;
-
-typedef struct {
-	UINT8 bLength;
-	UINT8 bDescriptorType;
-	UINT16 bcdUSB;
-	UINT8 bDeviceClass;
-	UINT8 bDeviceSubClass;
-	UINT8 bDeviceProtocol;
-	UINT8 bMaxPacketSize0;
-	UINT16 idVendor;
-	UINT16 idProduct;
-	UINT16 bcdDevice;
-	UINT8 iManufacturer;
-	UINT8 iProduct;
-	UINT8 iSerialNumber;
-	UINT8 bNumConfigurations;
-} UKW_DEVICE_DESCRIPTOR, *PUKW_DEVICE_DESCRIPTOR, *LPUKW_DEVICE_DESCRIPTOR;
-
-typedef struct {
-	UINT8 bmRequestType;
-	UINT8 bRequest;
-	UINT16 wValue;
-	UINT16 wIndex;
-	UINT16 wLength;
-} UKW_CONTROL_HEADER, *PUKW_CONTROL_HEADER, *LPUKW_CONTROL_HEADER;
-
-// Collection of flags which can be used when issuing transfer requests
-/* Indicates that the transfer direction is 'in' */
-#define UKW_TF_IN_TRANSFER        0x00000001
-/* Indicates that the transfer direction is 'out' */
-#define UKW_TF_OUT_TRANSFER       0x00000000
-/* Specifies that the transfer should complete as soon as possible,
- * even if no OVERLAPPED structure has been provided. */
-#define UKW_TF_NO_WAIT            0x00000100
-/* Indicates that transfers shorter than the buffer are ok */
-#define UKW_TF_SHORT_TRANSFER_OK  0x00000200
-#define UKW_TF_SEND_TO_DEVICE     0x00010000
-#define UKW_TF_SEND_TO_INTERFACE  0x00020000
-#define UKW_TF_SEND_TO_ENDPOINT   0x00040000
-/* Don't block when waiting for memory allocations */
-#define UKW_TF_DONT_BLOCK_FOR_MEM 0x00080000
-
-/* Value to use when dealing with configuration values, such as UkwGetConfigDescriptor, 
- * to specify the currently active configuration for the device. */
-#define UKW_ACTIVE_CONFIGURATION -1
-
-DLL_DECLARE(WINAPI, HANDLE, UkwOpenDriver, ());
-DLL_DECLARE(WINAPI, BOOL, UkwGetDeviceList, (HANDLE, LPUKW_DEVICE, DWORD, LPDWORD));
-DLL_DECLARE(WINAPI, void, UkwReleaseDeviceList, (HANDLE, LPUKW_DEVICE, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwGetDeviceAddress, (UKW_DEVICE, unsigned char*, unsigned char*, unsigned long*));
-DLL_DECLARE(WINAPI, BOOL, UkwGetDeviceDescriptor, (UKW_DEVICE, LPUKW_DEVICE_DESCRIPTOR));
-DLL_DECLARE(WINAPI, BOOL, UkwGetConfigDescriptor, (UKW_DEVICE, DWORD, LPVOID, DWORD, LPDWORD));
-DLL_DECLARE(WINAPI, void, UkwCloseDriver, (HANDLE));
-DLL_DECLARE(WINAPI, BOOL, UkwCancelTransfer, (UKW_DEVICE, LPOVERLAPPED, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwIssueControlTransfer, (UKW_DEVICE, DWORD, LPUKW_CONTROL_HEADER, LPVOID, DWORD, LPDWORD, LPOVERLAPPED));
-DLL_DECLARE(WINAPI, BOOL, UkwClaimInterface, (UKW_DEVICE, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwReleaseInterface, (UKW_DEVICE, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwSetInterfaceAlternateSetting, (UKW_DEVICE, DWORD, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwClearHaltHost, (UKW_DEVICE, UCHAR));
-DLL_DECLARE(WINAPI, BOOL, UkwClearHaltDevice, (UKW_DEVICE, UCHAR));
-DLL_DECLARE(WINAPI, BOOL, UkwGetConfig, (UKW_DEVICE, PUCHAR));
-DLL_DECLARE(WINAPI, BOOL, UkwSetConfig, (UKW_DEVICE, UCHAR));
-DLL_DECLARE(WINAPI, BOOL, UkwResetDevice, (UKW_DEVICE));
-DLL_DECLARE(WINAPI, BOOL, UkwKernelDriverActive, (UKW_DEVICE, DWORD, PBOOL));
-DLL_DECLARE(WINAPI, BOOL, UkwAttachKernelDriver, (UKW_DEVICE, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwDetachKernelDriver, (UKW_DEVICE, DWORD));
-DLL_DECLARE(WINAPI, BOOL, UkwIssueBulkTransfer, (UKW_DEVICE, DWORD, UCHAR, LPVOID, DWORD, LPDWORD, LPOVERLAPPED));
-DLL_DECLARE(WINAPI, BOOL, UkwIsPipeHalted, (UKW_DEVICE, UCHAR, LPBOOL));
-
-// Used to determine if an endpoint status really is halted on a failed transfer.
-#define STATUS_HALT_FLAG 0x1
-
-struct wince_device_priv {
-	UKW_DEVICE dev;
-	UKW_DEVICE_DESCRIPTOR desc;
-};
-
-struct wince_device_handle_priv {
-	// This member isn't used, but only exists to avoid an empty structure
-	// for private data for the device handle.
-	int reserved;
-};
-
-struct wince_transfer_priv {
-	struct winfd pollable_fd;
-	uint8_t interface_number;
-};
-
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_common.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_common.h
deleted file mode 100644
index 1da72bd9f8..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_common.h
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * Windows backend common header for libusbx 1.0
- *
- * This file brings together header code common between
- * the desktop Windows and Windows CE backends.
- * Copyright © 2012-2013 RealVNC Ltd.
- * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
- * Major code testing contribution by Xiaofan Chen
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#pragma once
-
-// Windows API default is uppercase - ugh!
-#if !defined(bool)
-#define bool BOOL
-#endif
-#if !defined(true)
-#define true TRUE
-#endif
-#if !defined(false)
-#define false FALSE
-#endif
-
-#define safe_free(p) do {if (p != NULL) {free((void*)p); p = NULL;}} while(0)
-#define safe_closehandle(h) do {if (h != INVALID_HANDLE_VALUE) {CloseHandle(h); h = INVALID_HANDLE_VALUE;}} while(0)
-#define safe_min(a, b) min((size_t)(a), (size_t)(b))
-#define safe_strcp(dst, dst_max, src, count) do {memcpy(dst, src, safe_min(count, dst_max)); \
-	((char*)dst)[safe_min(count, dst_max)-1] = 0;} while(0)
-#define safe_strcpy(dst, dst_max, src) safe_strcp(dst, dst_max, src, safe_strlen(src)+1)
-#define safe_strncat(dst, dst_max, src, count) strncat(dst, src, safe_min(count, dst_max - safe_strlen(dst) - 1))
-#define safe_strcat(dst, dst_max, src) safe_strncat(dst, dst_max, src, safe_strlen(src)+1)
-#define safe_strcmp(str1, str2) strcmp(((str1==NULL)?"<NULL>":str1), ((str2==NULL)?"<NULL>":str2))
-#define safe_stricmp(str1, str2) _stricmp(((str1==NULL)?"<NULL>":str1), ((str2==NULL)?"<NULL>":str2))
-#define safe_strncmp(str1, str2, count) strncmp(((str1==NULL)?"<NULL>":str1), ((str2==NULL)?"<NULL>":str2), count)
-#define safe_strlen(str) ((str==NULL)?0:strlen(str))
-#define safe_sprintf(dst, count, ...) do {_snprintf(dst, count, __VA_ARGS__); (dst)[(count)-1] = 0; } while(0)
-#define safe_stprintf _sntprintf
-#define safe_tcslen(str) ((str==NULL)?0:_tcslen(str))
-#define safe_unref_device(dev) do {if (dev != NULL) {libusb_unref_device(dev); dev = NULL;}} while(0)
-#define wchar_to_utf8_ms(wstr, str, strlen) WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, strlen, NULL, NULL)
-#ifndef ARRAYSIZE
-#define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
-#endif
-
-#define ERR_BUFFER_SIZE             256
-#define TIMER_REQUEST_RETRY_MS      100
-#define MAX_TIMER_SEMAPHORES        128
-
-
-/*
- * API macros - from libusb-win32 1.x
- */
-#define DLL_DECLARE_PREFIXNAME(api, ret, prefixname, name, args)    \
-	typedef ret (api * __dll_##name##_t)args;                       \
-	static __dll_##name##_t prefixname = NULL
-
-#ifndef _WIN32_WCE
-#define DLL_STRINGIFY(dll) #dll
-#define DLL_GET_MODULE_HANDLE(dll) GetModuleHandleA(DLL_STRINGIFY(dll))
-#define DLL_LOAD_LIBRARY(dll) LoadLibraryA(DLL_STRINGIFY(dll))
-#else
-#define DLL_STRINGIFY(dll) L#dll
-#define DLL_GET_MODULE_HANDLE(dll) GetModuleHandle(DLL_STRINGIFY(dll))
-#define DLL_LOAD_LIBRARY(dll) LoadLibrary(DLL_STRINGIFY(dll))
-#endif
-
-#define DLL_LOAD_PREFIXNAME(dll, prefixname, name, ret_on_failure) \
-	do {                                                           \
-		HMODULE h = DLL_GET_MODULE_HANDLE(dll);                    \
-	if (!h)                                                        \
-		h = DLL_LOAD_LIBRARY(dll);                                 \
-	if (!h) {                                                      \
-		if (ret_on_failure) { return LIBUSB_ERROR_NOT_FOUND; }     \
-		else { break; }                                            \
-	}                                                              \
-	prefixname = (__dll_##name##_t)GetProcAddress(h,               \
-	                        DLL_STRINGIFY(name));                  \
-	if (prefixname) break;                                         \
-	prefixname = (__dll_##name##_t)GetProcAddress(h,               \
-	                        DLL_STRINGIFY(name) DLL_STRINGIFY(A)); \
-	if (prefixname) break;                                         \
-	prefixname = (__dll_##name##_t)GetProcAddress(h,               \
-	                        DLL_STRINGIFY(name) DLL_STRINGIFY(W)); \
-	if (prefixname) break;                                         \
-	if(ret_on_failure)                                             \
-		return LIBUSB_ERROR_NOT_FOUND;                             \
-	} while(0)
-
-#define DLL_DECLARE(api, ret, name, args)   DLL_DECLARE_PREFIXNAME(api, ret, name, name, args)
-#define DLL_LOAD(dll, name, ret_on_failure) DLL_LOAD_PREFIXNAME(dll, name, name, ret_on_failure)
-#define DLL_DECLARE_PREFIXED(api, ret, prefix, name, args)   DLL_DECLARE_PREFIXNAME(api, ret, prefix##name, name, args)
-#define DLL_LOAD_PREFIXED(dll, prefix, name, ret_on_failure) DLL_LOAD_PREFIXNAME(dll, prefix##name, name, ret_on_failure)
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_usb.c b/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_usb.c
deleted file mode 100644
index 63357b1a21..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_usb.c
+++ /dev/null
@@ -1,4393 +0,0 @@
-/*
- * windows backend for libusbx 1.0
- * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
- * HID Reports IOCTLs inspired from HIDAPI by Alan Ott, Signal 11 Software
- * Hash table functions adapted from glibc, by Ulrich Drepper et al.
- * Major code testing contribution by Xiaofan Chen
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <config.h>
-#include <windows.h>
-#include <setupapi.h>
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <process.h>
-#include <stdio.h>
-#include <inttypes.h>
-#include <objbase.h>
-#include <winioctl.h>
-
-#include "libusbi.h"
-#include "poll_windows.h"
-#include "windows_usb.h"
-
-// The 2 macros below are used in conjunction with safe loops.
-#define LOOP_CHECK(fcall) { r=fcall; if (r != LIBUSB_SUCCESS) continue; }
-#define LOOP_BREAK(err) { r=err; continue; }
-
-// Helper prototypes
-static int windows_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len, int *host_endian);
-static int windows_clock_gettime(int clk_id, struct timespec *tp);
-unsigned __stdcall windows_clock_gettime_threaded(void* param);
-// Common calls
-static int common_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-
-// WinUSB-like API prototypes
-static int winusbx_init(int sub_api, struct libusb_context *ctx);
-static int winusbx_exit(int sub_api);
-static int winusbx_open(int sub_api, struct libusb_device_handle *dev_handle);
-static void winusbx_close(int sub_api, struct libusb_device_handle *dev_handle);
-static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting);
-static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
-static int winusbx_abort_transfers(int sub_api, struct usbi_transfer *itransfer);
-static int winusbx_abort_control(int sub_api, struct usbi_transfer *itransfer);
-static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_handle);
-static int winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size);
-// HID API prototypes
-static int hid_init(int sub_api, struct libusb_context *ctx);
-static int hid_exit(int sub_api);
-static int hid_open(int sub_api, struct libusb_device_handle *dev_handle);
-static void hid_close(int sub_api, struct libusb_device_handle *dev_handle);
-static int hid_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int hid_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int hid_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting);
-static int hid_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int hid_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int hid_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
-static int hid_abort_transfers(int sub_api, struct usbi_transfer *itransfer);
-static int hid_reset_device(int sub_api, struct libusb_device_handle *dev_handle);
-static int hid_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size);
-// Composite API prototypes
-static int composite_init(int sub_api, struct libusb_context *ctx);
-static int composite_exit(int sub_api);
-static int composite_open(int sub_api, struct libusb_device_handle *dev_handle);
-static void composite_close(int sub_api, struct libusb_device_handle *dev_handle);
-static int composite_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int composite_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting);
-static int composite_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-static int composite_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int composite_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int composite_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer);
-static int composite_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
-static int composite_abort_transfers(int sub_api, struct usbi_transfer *itransfer);
-static int composite_abort_control(int sub_api, struct usbi_transfer *itransfer);
-static int composite_reset_device(int sub_api, struct libusb_device_handle *dev_handle);
-static int composite_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size);
-
-
-// Global variables
-uint64_t hires_frequency, hires_ticks_to_ps;
-const uint64_t epoch_time = UINT64_C(116444736000000000);	// 1970.01.01 00:00:000 in MS Filetime
-enum windows_version windows_version = WINDOWS_UNSUPPORTED;
-// Concurrency
-static int concurrent_usage = -1;
-usbi_mutex_t autoclaim_lock;
-// Timer thread
-// NB: index 0 is for monotonic and 1 is for the thread exit event
-HANDLE timer_thread = NULL;
-HANDLE timer_mutex = NULL;
-struct timespec timer_tp;
-volatile LONG request_count[2] = {0, 1};	// last one must be > 0
-HANDLE timer_request[2] = { NULL, NULL };
-HANDLE timer_response = NULL;
-// API globals
-#define CHECK_WINUSBX_AVAILABLE(sub_api) do { if (sub_api == SUB_API_NOTSET) sub_api = priv->sub_api; \
-	if (!WinUSBX[sub_api].initialized) return LIBUSB_ERROR_ACCESS; } while(0)
-static struct winusb_interface WinUSBX[SUB_API_MAX];
-const char* sub_api_name[SUB_API_MAX] = WINUSBX_DRV_NAMES;
-bool api_hid_available = false;
-#define CHECK_HID_AVAILABLE do { if (!api_hid_available) return LIBUSB_ERROR_ACCESS; } while (0)
-
-static inline BOOLEAN guid_eq(const GUID *guid1, const GUID *guid2) {
-	if ((guid1 != NULL) && (guid2 != NULL)) {
-		return (memcmp(guid1, guid2, sizeof(GUID)) == 0);
-	}
-	return false;
-}
-
-#if defined(ENABLE_LOGGING)
-static char* guid_to_string(const GUID* guid)
-{
-	static char guid_string[MAX_GUID_STRING_LENGTH];
-
-	if (guid == NULL) return NULL;
-	sprintf(guid_string, "{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
-		(unsigned int)guid->Data1, guid->Data2, guid->Data3,
-		guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3],
-		guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
-	return guid_string;
-}
-#endif
-
-/*
- * Converts a windows error to human readable string
- * uses retval as errorcode, or, if 0, use GetLastError()
- */
-#if defined(ENABLE_LOGGING)
-static char *windows_error_str(uint32_t retval)
-{
-static char err_string[ERR_BUFFER_SIZE];
-
-	DWORD size;
-	ssize_t i;
-	uint32_t error_code, format_error;
-
-	error_code = retval?retval:GetLastError();
-
-	safe_sprintf(err_string, ERR_BUFFER_SIZE, "[%u] ", error_code);
-
-	size = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error_code,
-		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &err_string[safe_strlen(err_string)],
-		ERR_BUFFER_SIZE - (DWORD)safe_strlen(err_string), NULL);
-	if (size == 0) {
-		format_error = GetLastError();
-		if (format_error)
-			safe_sprintf(err_string, ERR_BUFFER_SIZE,
-				"Windows error code %u (FormatMessage error code %u)", error_code, format_error);
-		else
-			safe_sprintf(err_string, ERR_BUFFER_SIZE, "Unknown error code %u", error_code);
-	} else {
-		// Remove CR/LF terminators
-		for (i=safe_strlen(err_string)-1; (i>=0) && ((err_string[i]==0x0A) || (err_string[i]==0x0D)); i--) {
-			err_string[i] = 0;
-		}
-	}
-	return err_string;
-}
-#endif
-
-/*
- * Sanitize Microsoft's paths: convert to uppercase, add prefix and fix backslashes.
- * Return an allocated sanitized string or NULL on error.
- */
-static char* sanitize_path(const char* path)
-{
-	const char root_prefix[] = "\\\\.\\";
-	size_t j, size, root_size;
-	char* ret_path = NULL;
-	size_t add_root = 0;
-
-	if (path == NULL)
-		return NULL;
-
-	size = safe_strlen(path)+1;
-	root_size = sizeof(root_prefix)-1;
-
-	// Microsoft indiscriminatly uses '\\?\', '\\.\', '##?#" or "##.#" for root prefixes.
-	if (!((size > 3) && (((path[0] == '\\') && (path[1] == '\\') && (path[3] == '\\')) ||
-		((path[0] == '#') && (path[1] == '#') && (path[3] == '#'))))) {
-		add_root = root_size;
-		size += add_root;
-	}
-
-	if ((ret_path = (char*) calloc(size, 1)) == NULL)
-		return NULL;
-
-	safe_strcpy(&ret_path[add_root], size-add_root, path);
-
-	// Ensure consistancy with root prefix
-	for (j=0; j<root_size; j++)
-		ret_path[j] = root_prefix[j];
-
-	// Same goes for '\' and '#' after the root prefix. Ensure '#' is used
-	for(j=root_size; j<size; j++) {
-		ret_path[j] = (char)toupper((int)ret_path[j]);	// Fix case too
-		if (ret_path[j] == '\\')
-			ret_path[j] = '#';
-	}
-
-	return ret_path;
-}
-
-/*
- * Cfgmgr32, OLE32 and SetupAPI DLL functions
- */
-static int init_dlls(void)
-{
-	DLL_LOAD(Cfgmgr32.dll, CM_Get_Parent, TRUE);
-	DLL_LOAD(Cfgmgr32.dll, CM_Get_Child, TRUE);
-	DLL_LOAD(Cfgmgr32.dll, CM_Get_Sibling, TRUE);
-	DLL_LOAD(Cfgmgr32.dll, CM_Get_Device_IDA, TRUE);
-	// Prefixed to avoid conflict with header files
-	DLL_LOAD_PREFIXED(OLE32.dll, p, CLSIDFromString, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiGetClassDevsA, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiEnumDeviceInfo, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiEnumDeviceInterfaces, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiGetDeviceInterfaceDetailA, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiDestroyDeviceInfoList, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiOpenDevRegKey, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiGetDeviceRegistryPropertyA, TRUE);
-	DLL_LOAD_PREFIXED(SetupAPI.dll, p, SetupDiOpenDeviceInterfaceRegKey, TRUE);
-	DLL_LOAD_PREFIXED(AdvAPI32.dll, p, RegQueryValueExW, TRUE);
-	DLL_LOAD_PREFIXED(AdvAPI32.dll, p, RegCloseKey, TRUE);
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * enumerate interfaces for the whole USB class
- *
- * Parameters:
- * dev_info: a pointer to a dev_info list
- * dev_info_data: a pointer to an SP_DEVINFO_DATA to be filled (or NULL if not needed)
- * usb_class: the generic USB class for which to retrieve interface details
- * index: zero based index of the interface in the device info list
- *
- * Note: it is the responsibility of the caller to free the DEVICE_INTERFACE_DETAIL_DATA
- * structure returned and call this function repeatedly using the same guid (with an
- * incremented index starting at zero) until all interfaces have been returned.
- */
-static bool get_devinfo_data(struct libusb_context *ctx,
-	HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, const char* usb_class, unsigned _index)
-{
-	if (_index <= 0) {
-		*dev_info = pSetupDiGetClassDevsA(NULL, usb_class, NULL, DIGCF_PRESENT|DIGCF_ALLCLASSES);
-		if (*dev_info == INVALID_HANDLE_VALUE) {
-			return false;
-		}
-	}
-
-	dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA);
-	if (!pSetupDiEnumDeviceInfo(*dev_info, _index, dev_info_data)) {
-		if (GetLastError() != ERROR_NO_MORE_ITEMS) {
-			usbi_err(ctx, "Could not obtain device info data for index %u: %s",
-				_index, windows_error_str(0));
-		}
-		pSetupDiDestroyDeviceInfoList(*dev_info);
-		*dev_info = INVALID_HANDLE_VALUE;
-		return false;
-	}
-	return true;
-}
-
-/*
- * enumerate interfaces for a specific GUID
- *
- * Parameters:
- * dev_info: a pointer to a dev_info list
- * dev_info_data: a pointer to an SP_DEVINFO_DATA to be filled (or NULL if not needed)
- * guid: the GUID for which to retrieve interface details
- * index: zero based index of the interface in the device info list
- *
- * Note: it is the responsibility of the caller to free the DEVICE_INTERFACE_DETAIL_DATA
- * structure returned and call this function repeatedly using the same guid (with an
- * incremented index starting at zero) until all interfaces have been returned.
- */
-static SP_DEVICE_INTERFACE_DETAIL_DATA_A *get_interface_details(struct libusb_context *ctx,
-	HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, const GUID* guid, unsigned _index)
-{
-	SP_DEVICE_INTERFACE_DATA dev_interface_data;
-	SP_DEVICE_INTERFACE_DETAIL_DATA_A *dev_interface_details = NULL;
-	DWORD size;
-
-	if (_index <= 0) {
-		*dev_info = pSetupDiGetClassDevsA(guid, NULL, NULL, DIGCF_PRESENT|DIGCF_DEVICEINTERFACE);
-	}
-
-	if (dev_info_data != NULL) {
-		dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA);
-		if (!pSetupDiEnumDeviceInfo(*dev_info, _index, dev_info_data)) {
-			if (GetLastError() != ERROR_NO_MORE_ITEMS) {
-				usbi_err(ctx, "Could not obtain device info data for index %u: %s",
-					_index, windows_error_str(0));
-			}
-			pSetupDiDestroyDeviceInfoList(*dev_info);
-			*dev_info = INVALID_HANDLE_VALUE;
-			return NULL;
-		}
-	}
-
-	dev_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
-	if (!pSetupDiEnumDeviceInterfaces(*dev_info, NULL, guid, _index, &dev_interface_data)) {
-		if (GetLastError() != ERROR_NO_MORE_ITEMS) {
-			usbi_err(ctx, "Could not obtain interface data for index %u: %s",
-				_index, windows_error_str(0));
-		}
-		pSetupDiDestroyDeviceInfoList(*dev_info);
-		*dev_info = INVALID_HANDLE_VALUE;
-		return NULL;
-	}
-
-	// Read interface data (dummy + actual) to access the device path
-	if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data, NULL, 0, &size, NULL)) {
-		// The dummy call should fail with ERROR_INSUFFICIENT_BUFFER
-		if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-			usbi_err(ctx, "could not access interface data (dummy) for index %u: %s",
-				_index, windows_error_str(0));
-			goto err_exit;
-		}
-	} else {
-		usbi_err(ctx, "program assertion failed - http://msdn.microsoft.com/en-us/library/ms792901.aspx is wrong.");
-		goto err_exit;
-	}
-
-	if ((dev_interface_details = (SP_DEVICE_INTERFACE_DETAIL_DATA_A*) calloc(size, 1)) == NULL) {
-		usbi_err(ctx, "could not allocate interface data for index %u.", _index);
-		goto err_exit;
-	}
-
-	dev_interface_details->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A);
-	if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data,
-		dev_interface_details, size, &size, NULL)) {
-		usbi_err(ctx, "could not access interface data (actual) for index %u: %s",
-			_index, windows_error_str(0));
-	}
-
-	return dev_interface_details;
-
-err_exit:
-	pSetupDiDestroyDeviceInfoList(*dev_info);
-	*dev_info = INVALID_HANDLE_VALUE;
-	return NULL;
-}
-
-/* For libusb0 filter */
-static SP_DEVICE_INTERFACE_DETAIL_DATA_A *get_interface_details_filter(struct libusb_context *ctx,
-	HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, const GUID* guid, unsigned _index, char* filter_path){
-	SP_DEVICE_INTERFACE_DATA dev_interface_data;
-	SP_DEVICE_INTERFACE_DETAIL_DATA_A *dev_interface_details = NULL;
-	DWORD size;
-	if (_index <= 0) {
-		*dev_info = pSetupDiGetClassDevsA(guid, NULL, NULL, DIGCF_PRESENT|DIGCF_DEVICEINTERFACE);
-	}
-	if (dev_info_data != NULL) {
-		dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA);
-		if (!pSetupDiEnumDeviceInfo(*dev_info, _index, dev_info_data)) {
-			if (GetLastError() != ERROR_NO_MORE_ITEMS) {
-				usbi_err(ctx, "Could not obtain device info data for index %u: %s",
-					_index, windows_error_str(0));
-			}
-			pSetupDiDestroyDeviceInfoList(*dev_info);
-			*dev_info = INVALID_HANDLE_VALUE;
-			return NULL;
-		}
-	}
-	dev_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
-	if (!pSetupDiEnumDeviceInterfaces(*dev_info, NULL, guid, _index, &dev_interface_data)) {
-		if (GetLastError() != ERROR_NO_MORE_ITEMS) {
-			usbi_err(ctx, "Could not obtain interface data for index %u: %s",
-				_index, windows_error_str(0));
-		}
-		pSetupDiDestroyDeviceInfoList(*dev_info);
-		*dev_info = INVALID_HANDLE_VALUE;
-		return NULL;
-	}
-	// Read interface data (dummy + actual) to access the device path
-	if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data, NULL, 0, &size, NULL)) {
-		// The dummy call should fail with ERROR_INSUFFICIENT_BUFFER
-		if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-			usbi_err(ctx, "could not access interface data (dummy) for index %u: %s",
-				_index, windows_error_str(0));
-			goto err_exit;
-		}
-	} else {
-		usbi_err(ctx, "program assertion failed - http://msdn.microsoft.com/en-us/library/ms792901.aspx is wrong.");
-		goto err_exit;
-	}
-	if ((dev_interface_details = malloc(size)) == NULL) {
-		usbi_err(ctx, "could not allocate interface data for index %u.", _index);
-		goto err_exit;
-	}
-	dev_interface_details->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A);
-	if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data,
-		dev_interface_details, size, &size, NULL)) {
-		usbi_err(ctx, "could not access interface data (actual) for index %u: %s",
-			_index, windows_error_str(0));
-	}
-	// [trobinso] lookup the libusb0 symbolic index.
-	if (dev_interface_details) {
-		HKEY hkey_device_interface=pSetupDiOpenDeviceInterfaceRegKey(*dev_info,&dev_interface_data,0,KEY_READ);
-		if (hkey_device_interface != INVALID_HANDLE_VALUE) {
-			DWORD libusb0_symboliclink_index=0;
-			DWORD value_length=sizeof(DWORD);
-			DWORD value_type=0;
-			LONG status;
-			status = pRegQueryValueExW(hkey_device_interface, L"LUsb0", NULL, &value_type,
-				(LPBYTE) &libusb0_symboliclink_index, &value_length);
-			if (status == ERROR_SUCCESS) {
-				if (libusb0_symboliclink_index < 256) {
-					// libusb0.sys is connected to this device instance.
-					// If the the device interface guid is {F9F3FF14-AE21-48A0-8A25-8011A7A931D9} then it's a filter.
-					safe_sprintf(filter_path, sizeof("\\\\.\\libusb0-0000"), "\\\\.\\libusb0-%04d", libusb0_symboliclink_index);
-					usbi_dbg("assigned libusb0 symbolic link %s", filter_path);
-				} else {
-					// libusb0.sys was connected to this device instance at one time; but not anymore.
-				}
-			}
-			pRegCloseKey(hkey_device_interface);
-		}
-	}
-	return dev_interface_details;
-err_exit:
-	pSetupDiDestroyDeviceInfoList(*dev_info);
-	*dev_info = INVALID_HANDLE_VALUE;
-	return NULL;}
-
-/* Hash table functions - modified From glibc 2.3.2:
-   [Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986
-   [Knuth]            The Art of Computer Programming, part 3 (6.4)  */
-typedef struct htab_entry {
-	unsigned long used;
-	char* str;
-} htab_entry;
-htab_entry* htab_table = NULL;
-usbi_mutex_t htab_write_mutex = NULL;
-unsigned long htab_size, htab_filled;
-
-/* For the used double hash method the table size has to be a prime. To
-   correct the user given table size we need a prime test.  This trivial
-   algorithm is adequate because the code is called only during init and
-   the number is likely to be small  */
-static int isprime(unsigned long number)
-{
-	// no even number will be passed
-	unsigned int divider = 3;
-
-	while((divider * divider < number) && (number % divider != 0))
-		divider += 2;
-
-	return (number % divider != 0);
-}
-
-/* Before using the hash table we must allocate memory for it.
-   We allocate one element more as the found prime number says.
-   This is done for more effective indexing as explained in the
-   comment for the hash function.  */
-static int htab_create(struct libusb_context *ctx, unsigned long nel)
-{
-	if (htab_table != NULL) {
-		usbi_err(ctx, "hash table already allocated");
-	}
-
-	// Create a mutex
-	usbi_mutex_init(&htab_write_mutex, NULL);
-
-	// Change nel to the first prime number not smaller as nel.
-	nel |= 1;
-	while(!isprime(nel))
-		nel += 2;
-
-	htab_size = nel;
-	usbi_dbg("using %d entries hash table", nel);
-	htab_filled = 0;
-
-	// allocate memory and zero out.
-	htab_table = (htab_entry*) calloc(htab_size + 1, sizeof(htab_entry));
-	if (htab_table == NULL) {
-		usbi_err(ctx, "could not allocate space for hash table");
-		return 0;
-	}
-
-	return 1;
-}
-
-/* After using the hash table it has to be destroyed.  */
-static void htab_destroy(void)
-{
-	size_t i;
-	if (htab_table == NULL) {
-		return;
-	}
-
-	for (i=0; i<htab_size; i++) {
-		if (htab_table[i].used) {
-			safe_free(htab_table[i].str);
-		}
-	}
-	usbi_mutex_destroy(&htab_write_mutex);
-	safe_free(htab_table);
-}
-
-/* This is the search function. It uses double hashing with open addressing.
-   We use an trick to speed up the lookup. The table is created with one
-   more element available. This enables us to use the index zero special.
-   This index will never be used because we store the first hash index in
-   the field used where zero means not used. Every other value means used.
-   The used field can be used as a first fast comparison for equality of
-   the stored and the parameter value. This helps to prevent unnecessary
-   expensive calls of strcmp.  */
-static unsigned long htab_hash(char* str)
-{
-	unsigned long hval, hval2;
-	unsigned long idx;
-	unsigned long r = 5381;
-	int c;
-	char* sz = str;
-
-	if (str == NULL)
-		return 0;
-
-	// Compute main hash value (algorithm suggested by Nokia)
-	while ((c = *sz++) != 0)
-		r = ((r << 5) + r) + c;
-	if (r == 0)
-		++r;
-
-	// compute table hash: simply take the modulus
-	hval = r % htab_size;
-	if (hval == 0)
-		++hval;
-
-	// Try the first index
-	idx = hval;
-
-	if (htab_table[idx].used) {
-		if ( (htab_table[idx].used == hval)
-		  && (safe_strcmp(str, htab_table[idx].str) == 0) ) {
-			// existing hash
-			return idx;
-		}
-		usbi_dbg("hash collision ('%s' vs '%s')", str, htab_table[idx].str);
-
-		// Second hash function, as suggested in [Knuth]
-		hval2 = 1 + hval % (htab_size - 2);
-
-		do {
-			// Because size is prime this guarantees to step through all available indexes
-			if (idx <= hval2) {
-				idx = htab_size + idx - hval2;
-			} else {
-				idx -= hval2;
-			}
-
-			// If we visited all entries leave the loop unsuccessfully
-			if (idx == hval) {
-				break;
-			}
-
-			// If entry is found use it.
-			if ( (htab_table[idx].used == hval)
-			  && (safe_strcmp(str, htab_table[idx].str) == 0) ) {
-				return idx;
-			}
-		}
-		while (htab_table[idx].used);
-	}
-
-	// Not found => New entry
-
-	// If the table is full return an error
-	if (htab_filled >= htab_size) {
-		usbi_err(NULL, "hash table is full (%d entries)", htab_size);
-		return 0;
-	}
-
-	// Concurrent threads might be storing the same entry at the same time
-	// (eg. "simultaneous" enums from different threads) => use a mutex
-	usbi_mutex_lock(&htab_write_mutex);
-	// Just free any previously allocated string (which should be the same as
-	// new one). The possibility of concurrent threads storing a collision
-	// string (same hash, different string) at the same time is extremely low
-	safe_free(htab_table[idx].str);
-	htab_table[idx].used = hval;
-	htab_table[idx].str = (char*) malloc(safe_strlen(str)+1);
-	if (htab_table[idx].str == NULL) {
-		usbi_err(NULL, "could not duplicate string for hash table");
-		usbi_mutex_unlock(&htab_write_mutex);
-		return 0;
-	}
-	memcpy(htab_table[idx].str, str, safe_strlen(str)+1);
-	++htab_filled;
-	usbi_mutex_unlock(&htab_write_mutex);
-
-	return idx;
-}
-
-/*
- * Returns the session ID of a device's nth level ancestor
- * If there's no device at the nth level, return 0
- */
-static unsigned long get_ancestor_session_id(DWORD devinst, unsigned level)
-{
-	DWORD parent_devinst;
-	unsigned long session_id = 0;
-	char* sanitized_path = NULL;
-	char path[MAX_PATH_LENGTH];
-	unsigned i;
-
-	if (level < 1) return 0;
-	for (i = 0; i<level; i++) {
-		if (CM_Get_Parent(&parent_devinst, devinst, 0) != CR_SUCCESS) {
-			return 0;
-		}
-		devinst = parent_devinst;
-	}
-	if (CM_Get_Device_IDA(devinst, path, MAX_PATH_LENGTH, 0) != CR_SUCCESS) {
-		return 0;
-	}
-	// TODO: (post hotplug): try without sanitizing
-	sanitized_path = sanitize_path(path);
-	if (sanitized_path == NULL) {
-		return 0;
-	}
-	session_id = htab_hash(sanitized_path);
-	safe_free(sanitized_path);
-	return session_id;
-}
-
-/*
- * Populate the endpoints addresses of the device_priv interface helper structs
- */
-static int windows_assign_endpoints(struct libusb_device_handle *dev_handle, int iface, int altsetting)
-{
-	int i, r;
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	struct libusb_config_descriptor *conf_desc;
-	const struct libusb_interface_descriptor *if_desc;
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-
-	r = libusb_get_config_descriptor(dev_handle->dev, 0, &conf_desc);
-	if (r != LIBUSB_SUCCESS) {
-		usbi_warn(ctx, "could not read config descriptor: error %d", r);
-		return r;
-	}
-
-	if_desc = &conf_desc->interface[iface].altsetting[altsetting];
-	safe_free(priv->usb_interface[iface].endpoint);
-
-	if (if_desc->bNumEndpoints == 0) {
-		usbi_dbg("no endpoints found for interface %d", iface);
-		return LIBUSB_SUCCESS;
-	}
-
-	priv->usb_interface[iface].endpoint = (uint8_t*) malloc(if_desc->bNumEndpoints);
-	if (priv->usb_interface[iface].endpoint == NULL) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	priv->usb_interface[iface].nb_endpoints = if_desc->bNumEndpoints;
-	for (i=0; i<if_desc->bNumEndpoints; i++) {
-		priv->usb_interface[iface].endpoint[i] = if_desc->endpoint[i].bEndpointAddress;
-		usbi_dbg("(re)assigned endpoint %02X to interface %d", priv->usb_interface[iface].endpoint[i], iface);
-	}
-	libusb_free_config_descriptor(conf_desc);
-
-	// Extra init may be required to configure endpoints
-	return priv->apib->configure_endpoints(SUB_API_NOTSET, dev_handle, iface);
-}
-
-// Lookup for a match in the list of API driver names
-// return -1 if not found, driver match number otherwise
-static int get_sub_api(char* driver, int api){
-	int i;
-	const char sep_str[2] = {LIST_SEPARATOR, 0};
-	char *tok, *tmp_str;
-	size_t len = safe_strlen(driver);
-
-	if (len == 0) return SUB_API_NOTSET;
-	tmp_str = (char*) calloc(len+1, 1);
-	if (tmp_str == NULL) return SUB_API_NOTSET;
-	memcpy(tmp_str, driver, len+1);
-	tok = strtok(tmp_str, sep_str);
-	while (tok != NULL) {
-		for (i=0; i<usb_api_backend[api].nb_driver_names; i++) {
-			if (safe_stricmp(tok, usb_api_backend[api].driver_name_list[i]) == 0) {
-				free(tmp_str);
-				return i;
-			}
-		}
-		tok = strtok(NULL, sep_str);
-	}
-	free (tmp_str);
-	return SUB_API_NOTSET;
-}
-
-/*
- * auto-claiming and auto-release helper functions
- */
-static int auto_claim(struct libusb_transfer *transfer, int *interface_number, int api_type)
-{
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(
-		transfer->dev_handle);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int current_interface = *interface_number;
-	int r = LIBUSB_SUCCESS;
-
-	switch(api_type) {
-	case USB_API_WINUSBX:
-	case USB_API_HID:
-		break;
-	default:
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	usbi_mutex_lock(&autoclaim_lock);
-	if (current_interface < 0)	// No serviceable interface was found
-	{
-		for (current_interface=0; current_interface<USB_MAXINTERFACES; current_interface++) {
-			// Must claim an interface of the same API type
-			if ( (priv->usb_interface[current_interface].apib->id == api_type)
-			  && (libusb_claim_interface(transfer->dev_handle, current_interface) == LIBUSB_SUCCESS) ) {
-				usbi_dbg("auto-claimed interface %d for control request", current_interface);
-				if (handle_priv->autoclaim_count[current_interface] != 0) {
-					usbi_warn(ctx, "program assertion failed - autoclaim_count was nonzero");
-				}
-				handle_priv->autoclaim_count[current_interface]++;
-				break;
-			}
-		}
-		if (current_interface == USB_MAXINTERFACES) {
-			usbi_err(ctx, "could not auto-claim any interface");
-			r = LIBUSB_ERROR_NOT_FOUND;
-		}
-	} else {
-		// If we have a valid interface that was autoclaimed, we must increment
-		// its autoclaim count so that we can prevent an early release.
-		if (handle_priv->autoclaim_count[current_interface] != 0) {
-			handle_priv->autoclaim_count[current_interface]++;
-		}
-	}
-	usbi_mutex_unlock(&autoclaim_lock);
-
-	*interface_number = current_interface;
-	return r;
-
-}
-
-static void auto_release(struct usbi_transfer *itransfer)
-{
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	libusb_device_handle *dev_handle = transfer->dev_handle;
-	struct windows_device_handle_priv* handle_priv = _device_handle_priv(dev_handle);
-	int r;
-
-	usbi_mutex_lock(&autoclaim_lock);
-	if (handle_priv->autoclaim_count[transfer_priv->interface_number] > 0) {
-		handle_priv->autoclaim_count[transfer_priv->interface_number]--;
-		if (handle_priv->autoclaim_count[transfer_priv->interface_number] == 0) {
-			r = libusb_release_interface(dev_handle, transfer_priv->interface_number);
-			if (r == LIBUSB_SUCCESS) {
-				usbi_dbg("auto-released interface %d", transfer_priv->interface_number);
-			} else {
-				usbi_dbg("failed to auto-release interface %d (%s)",
-					transfer_priv->interface_number, libusb_error_name((enum libusb_error)r));
-			}
-		}
-	}
-	usbi_mutex_unlock(&autoclaim_lock);
-}
-
-/*
- * init: libusbx backend init function
- *
- * This function enumerates the HCDs (Host Controller Drivers) and populates our private HCD list
- * In our implementation, we equate Windows' "HCD" to libusbx's "bus". Note that bus is zero indexed.
- * HCDs are not expected to change after init (might not hold true for hot pluggable USB PCI card?)
- */
-static int windows_init(struct libusb_context *ctx)
-{
-	int i, r = LIBUSB_ERROR_OTHER;
-	OSVERSIONINFO os_version;
-	HANDLE semaphore;
-	char sem_name[11+1+8]; // strlen(libusb_init)+'\0'+(32-bit hex PID)
-
-	sprintf(sem_name, "libusb_init%08X", (unsigned int)GetCurrentProcessId()&0xFFFFFFFF);
-	semaphore = CreateSemaphoreA(NULL, 1, 1, sem_name);
-	if (semaphore == NULL) {
-		usbi_err(ctx, "could not create semaphore: %s", windows_error_str(0));
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	// A successful wait brings our semaphore count to 0 (unsignaled)
-	// => any concurent wait stalls until the semaphore's release
-	if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
-		usbi_err(ctx, "failure to access semaphore: %s", windows_error_str(0));
-		CloseHandle(semaphore);
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	// NB: concurrent usage supposes that init calls are equally balanced with
-	// exit calls. If init is called more than exit, we will not exit properly
-	if ( ++concurrent_usage == 0 ) {	// First init?
-		// Detect OS version
-		memset(&os_version, 0, sizeof(OSVERSIONINFO));
-		os_version.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
-		windows_version = WINDOWS_UNSUPPORTED;
-		if ((GetVersionEx(&os_version) != 0) && (os_version.dwPlatformId == VER_PLATFORM_WIN32_NT)) {
-			if ((os_version.dwMajorVersion == 5) && (os_version.dwMinorVersion == 1)) {
-				windows_version = WINDOWS_XP;
-			} else if ((os_version.dwMajorVersion == 5) && (os_version.dwMinorVersion == 2)) {
-				windows_version = WINDOWS_2003;	// also includes XP 64
-			} else if (os_version.dwMajorVersion >= 6) {
-				windows_version = WINDOWS_VISTA_AND_LATER;
-			}
-		}
-		if (windows_version == WINDOWS_UNSUPPORTED) {
-			usbi_err(ctx, "This version of Windows is NOT supported");
-			r = LIBUSB_ERROR_NOT_SUPPORTED;
-			goto init_exit;
-		}
-
-		// We need a lock for proper auto-release
-		usbi_mutex_init(&autoclaim_lock, NULL);
-
-		// Initialize pollable file descriptors
-		init_polling();
-
-		// Load DLL imports
-		if (init_dlls() != LIBUSB_SUCCESS) {
-			usbi_err(ctx, "could not resolve DLL functions");
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-
-		// Initialize the low level APIs (we don't care about errors at this stage)
-		for (i=0; i<USB_API_MAX; i++) {
-			usb_api_backend[i].init(SUB_API_NOTSET, ctx);
-		}
-
-		// Because QueryPerformanceCounter might report different values when
-		// running on different cores, we create a separate thread for the timer
-		// calls, which we glue to the first core always to prevent timing discrepancies.
-		r = LIBUSB_ERROR_NO_MEM;
-		for (i = 0; i < 2; i++) {
-			timer_request[i] = CreateEvent(NULL, TRUE, FALSE, NULL);
-			if (timer_request[i] == NULL) {
-				usbi_err(ctx, "could not create timer request event %d - aborting", i);
-				goto init_exit;
-			}
-		}
-		timer_response = CreateSemaphore(NULL, 0, MAX_TIMER_SEMAPHORES, NULL);
-		if (timer_response == NULL) {
-			usbi_err(ctx, "could not create timer response semaphore - aborting");
-			goto init_exit;
-		}
-		timer_mutex = CreateMutex(NULL, FALSE, NULL);
-		if (timer_mutex == NULL) {
-			usbi_err(ctx, "could not create timer mutex - aborting");
-			goto init_exit;
-		}
-		timer_thread = (HANDLE)_beginthreadex(NULL, 0, windows_clock_gettime_threaded, NULL, 0, NULL);
-		if (timer_thread == NULL) {
-			usbi_err(ctx, "Unable to create timer thread - aborting");
-			goto init_exit;
-		}
-		SetThreadAffinityMask(timer_thread, 0);
-
-		// Create a hash table to store session ids. Second parameter is better if prime
-		htab_create(ctx, HTAB_SIZE);
-	}
-	// At this stage, either we went through full init successfully, or didn't need to
-	r = LIBUSB_SUCCESS;
-
-init_exit: // Holds semaphore here.
-	if (!concurrent_usage && r != LIBUSB_SUCCESS) { // First init failed?
-		if (timer_thread) {
-			SetEvent(timer_request[1]); // actually the signal to quit the thread.
-			if (WAIT_OBJECT_0 != WaitForSingleObject(timer_thread, INFINITE)) {
-				usbi_warn(ctx, "could not wait for timer thread to quit");
-				TerminateThread(timer_thread, 1); // shouldn't happen, but we're destroying
-												  // all objects it might have held anyway.
-			}
-			CloseHandle(timer_thread);
-			timer_thread = NULL;
-		}
-		for (i = 0; i < 2; i++) {
-			if (timer_request[i]) {
-				CloseHandle(timer_request[i]);
-				timer_request[i] = NULL;
-			}
-		}
-		if (timer_response) {
-			CloseHandle(timer_response);
-			timer_response = NULL;
-		}
-		if (timer_mutex) {
-			CloseHandle(timer_mutex);
-			timer_mutex = NULL;
-		}
-		htab_destroy();
-	}
-
-	if (r != LIBUSB_SUCCESS)
-		--concurrent_usage; // Not expected to call libusb_exit if we failed.
-
-	ReleaseSemaphore(semaphore, 1, NULL);	// increase count back to 1
-	CloseHandle(semaphore);
-	return r;
-}
-
-/*
- * HCD (root) hubs need to have their device descriptor manually populated
- *
- * Note that, like Microsoft does in the device manager, we populate the
- * Vendor and Device ID for HCD hubs with the ones from the PCI HCD device.
- */
-static int force_hcd_device_descriptor(struct libusb_device *dev)
-{
-	struct windows_device_priv *parent_priv, *priv = _device_priv(dev);
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	int vid, pid;
-
-	dev->num_configurations = 1;
-	priv->dev_descriptor.bLength = sizeof(USB_DEVICE_DESCRIPTOR);
-	priv->dev_descriptor.bDescriptorType = USB_DEVICE_DESCRIPTOR_TYPE;
-	priv->dev_descriptor.bNumConfigurations = 1;
-	priv->active_config = 1;
-
-	if (priv->parent_dev == NULL) {
-		usbi_err(ctx, "program assertion failed - HCD hub has no parent");
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-	parent_priv = _device_priv(priv->parent_dev);
-	if (sscanf(parent_priv->path, "\\\\.\\PCI#VEN_%04x&DEV_%04x%*s", &vid, &pid) == 2) {
-		priv->dev_descriptor.idVendor = (uint16_t)vid;
-		priv->dev_descriptor.idProduct = (uint16_t)pid;
-	} else {
-		usbi_warn(ctx, "could not infer VID/PID of HCD hub from '%s'", parent_priv->path);
-		priv->dev_descriptor.idVendor = 0x1d6b;		// Linux Foundation root hub
-		priv->dev_descriptor.idProduct = 1;
-	}
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * fetch and cache all the config descriptors through I/O
- */
-static int cache_config_descriptors(struct libusb_device *dev, HANDLE hub_handle, char* device_id)
-{
-	DWORD size, ret_size;
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	struct windows_device_priv *priv = _device_priv(dev);
-	int r;
-	uint8_t i;
-
-	USB_CONFIGURATION_DESCRIPTOR_SHORT cd_buf_short;    // dummy request
-	PUSB_DESCRIPTOR_REQUEST cd_buf_actual = NULL;       // actual request
-	PUSB_CONFIGURATION_DESCRIPTOR cd_data = NULL;
-
-	if (dev->num_configurations == 0)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	priv->config_descriptor = (unsigned char**) calloc(dev->num_configurations, sizeof(unsigned char*));
-	if (priv->config_descriptor == NULL)
-		return LIBUSB_ERROR_NO_MEM;
-	for (i=0; i<dev->num_configurations; i++)
-		priv->config_descriptor[i] = NULL;
-
-	for (i=0, r=LIBUSB_SUCCESS; ; i++)
-	{
-		// safe loop: release all dynamic resources
-		safe_free(cd_buf_actual);
-
-		// safe loop: end of loop condition
-		if ((i >= dev->num_configurations) || (r != LIBUSB_SUCCESS))
-			break;
-
-		size = sizeof(USB_CONFIGURATION_DESCRIPTOR_SHORT);
-		memset(&cd_buf_short, 0, size);
-
-		cd_buf_short.req.ConnectionIndex = (ULONG)priv->port;
-		cd_buf_short.req.SetupPacket.bmRequest = LIBUSB_ENDPOINT_IN;
-		cd_buf_short.req.SetupPacket.bRequest = USB_REQUEST_GET_DESCRIPTOR;
-		cd_buf_short.req.SetupPacket.wValue = (USB_CONFIGURATION_DESCRIPTOR_TYPE << 8) | i;
-		cd_buf_short.req.SetupPacket.wIndex = i;
-		cd_buf_short.req.SetupPacket.wLength = (USHORT)(size - sizeof(USB_DESCRIPTOR_REQUEST));
-
-		// Dummy call to get the required data size. Initial failures are reported as info rather
-		// than error as they can occur for non-penalizing situations, such as with some hubs.
-		if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, &cd_buf_short, size,
-			&cd_buf_short, size, &ret_size, NULL)) {
-			usbi_info(ctx, "could not access configuration descriptor (dummy) for '%s': %s", device_id, windows_error_str(0));
-			LOOP_BREAK(LIBUSB_ERROR_IO);
-		}
-
-		if ((ret_size != size) || (cd_buf_short.data.wTotalLength < sizeof(USB_CONFIGURATION_DESCRIPTOR))) {
-			usbi_info(ctx, "unexpected configuration descriptor size (dummy) for '%s'.", device_id);
-			LOOP_BREAK(LIBUSB_ERROR_IO);
-		}
-
-		size = sizeof(USB_DESCRIPTOR_REQUEST) + cd_buf_short.data.wTotalLength;
-		if ((cd_buf_actual = (PUSB_DESCRIPTOR_REQUEST) calloc(1, size)) == NULL) {
-			usbi_err(ctx, "could not allocate configuration descriptor buffer for '%s'.", device_id);
-			LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
-		}
-		memset(cd_buf_actual, 0, size);
-
-		// Actual call
-		cd_buf_actual->ConnectionIndex = (ULONG)priv->port;
-		cd_buf_actual->SetupPacket.bmRequest = LIBUSB_ENDPOINT_IN;
-		cd_buf_actual->SetupPacket.bRequest = USB_REQUEST_GET_DESCRIPTOR;
-		cd_buf_actual->SetupPacket.wValue = (USB_CONFIGURATION_DESCRIPTOR_TYPE << 8) | i;
-		cd_buf_actual->SetupPacket.wIndex = i;
-		cd_buf_actual->SetupPacket.wLength = (USHORT)(size - sizeof(USB_DESCRIPTOR_REQUEST));
-
-		if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, cd_buf_actual, size,
-			cd_buf_actual, size, &ret_size, NULL)) {
-			usbi_err(ctx, "could not access configuration descriptor (actual) for '%s': %s", device_id, windows_error_str(0));
-			LOOP_BREAK(LIBUSB_ERROR_IO);
-		}
-
-		cd_data = (PUSB_CONFIGURATION_DESCRIPTOR)((UCHAR*)cd_buf_actual+sizeof(USB_DESCRIPTOR_REQUEST));
-
-		if ((size != ret_size) || (cd_data->wTotalLength != cd_buf_short.data.wTotalLength)) {
-			usbi_err(ctx, "unexpected configuration descriptor size (actual) for '%s'.", device_id);
-			LOOP_BREAK(LIBUSB_ERROR_IO);
-		}
-
-		if (cd_data->bDescriptorType != USB_CONFIGURATION_DESCRIPTOR_TYPE) {
-			usbi_err(ctx, "not a configuration descriptor for '%s'", device_id);
-			LOOP_BREAK(LIBUSB_ERROR_IO);
-		}
-
-		usbi_dbg("cached config descriptor %d (bConfigurationValue=%d, %d bytes)",
-			i, cd_data->bConfigurationValue, cd_data->wTotalLength);
-
-		// Cache the descriptor
-		priv->config_descriptor[i] = (unsigned char*) malloc(cd_data->wTotalLength);
-		if (priv->config_descriptor[i] == NULL)
-			return LIBUSB_ERROR_NO_MEM;
-		memcpy(priv->config_descriptor[i], cd_data, cd_data->wTotalLength);
-	}
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * Populate a libusbx device structure
- */
-static int init_device(struct libusb_device* dev, struct libusb_device* parent_dev,
-					   uint8_t port_number, char* device_id, DWORD devinst)
-{
-	HANDLE handle;
-	DWORD size;
-	USB_NODE_CONNECTION_INFORMATION_EX conn_info;
-	struct windows_device_priv *priv, *parent_priv;
-	struct libusb_context *ctx = DEVICE_CTX(dev);
-	struct libusb_device* tmp_dev;
-	unsigned i;
-
-	if ((dev == NULL) || (parent_dev == NULL)) {
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-	priv = _device_priv(dev);
-	parent_priv = _device_priv(parent_dev);
-	if (parent_priv->apib->id != USB_API_HUB) {
-		usbi_warn(ctx, "parent for device '%s' is not a hub", device_id);
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	// It is possible for the parent hub not to have been initialized yet
-	// If that's the case, lookup the ancestors to set the bus number
-	if (parent_dev->bus_number == 0) {
-		for (i=2; ; i++) {
-			tmp_dev = usbi_get_device_by_session_id(ctx, get_ancestor_session_id(devinst, i));
-			if (tmp_dev == NULL) break;
-			if (tmp_dev->bus_number != 0) {
-				usbi_dbg("got bus number from ancestor #%d", i);
-				parent_dev->bus_number = tmp_dev->bus_number;
-				break;
-			}
-		}
-	}
-	if (parent_dev->bus_number == 0) {
-		usbi_err(ctx, "program assertion failed: unable to find ancestor bus number for '%s'", device_id);
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-	dev->bus_number = parent_dev->bus_number;
-	priv->port = port_number;
-	dev->port_number = port_number;
-	priv->depth = parent_priv->depth + 1;
-	priv->parent_dev = parent_dev;
-	dev->parent_dev = libusb_ref_device(parent_dev);
-
-	// If the device address is already set, we can stop here
-	if (dev->device_address != 0) {
-		return LIBUSB_SUCCESS;
-	}
-	memset(&conn_info, 0, sizeof(conn_info));
-	if (priv->depth != 0) {	// Not a HCD hub
-		handle = CreateFileA(parent_priv->path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
-			FILE_FLAG_OVERLAPPED, NULL);
-		if (handle == INVALID_HANDLE_VALUE) {
-			usbi_warn(ctx, "could not open hub %s: %s", parent_priv->path, windows_error_str(0));
-			return LIBUSB_ERROR_ACCESS;
-		}
-		size = sizeof(conn_info);
-		conn_info.ConnectionIndex = (ULONG)port_number;
-		if (!DeviceIoControl(handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX, &conn_info, size,
-			&conn_info, size, &size, NULL)) {
-			usbi_warn(ctx, "could not get node connection information for device '%s': %s",
-				device_id, windows_error_str(0));
-			safe_closehandle(handle);
-			return LIBUSB_ERROR_NO_DEVICE;
-		}
-		if (conn_info.ConnectionStatus == NoDeviceConnected) {
-			usbi_err(ctx, "device '%s' is no longer connected!", device_id);
-			safe_closehandle(handle);
-			return LIBUSB_ERROR_NO_DEVICE;
-		}
-		memcpy(&priv->dev_descriptor, &(conn_info.DeviceDescriptor), sizeof(USB_DEVICE_DESCRIPTOR));
-		dev->num_configurations = priv->dev_descriptor.bNumConfigurations;
-		priv->active_config = conn_info.CurrentConfigurationValue;
-		usbi_dbg("found %d configurations (active conf: %d)", dev->num_configurations, priv->active_config);
-		// If we can't read the config descriptors, just set the number of confs to zero
-		if (cache_config_descriptors(dev, handle, device_id) != LIBUSB_SUCCESS) {
-			dev->num_configurations = 0;
-			priv->dev_descriptor.bNumConfigurations = 0;
-		}
-		safe_closehandle(handle);
-
-		if (conn_info.DeviceAddress > UINT8_MAX) {
-			usbi_err(ctx, "program assertion failed: device address overflow");
-		}
-		dev->device_address = (uint8_t)conn_info.DeviceAddress + 1;
-		if (dev->device_address == 1) {
-			usbi_err(ctx, "program assertion failed: device address collision with root hub");
-		}
-		switch (conn_info.Speed) {
-		case 0: dev->speed = LIBUSB_SPEED_LOW; break;
-		case 1: dev->speed = LIBUSB_SPEED_FULL; break;
-		case 2: dev->speed = LIBUSB_SPEED_HIGH; break;
-		case 3: dev->speed = LIBUSB_SPEED_SUPER; break;
-		default:
-			usbi_warn(ctx, "Got unknown device speed %d", conn_info.Speed);
-			break;
-		}
-	} else {
-		dev->device_address = 1;	// root hubs are set to use device number 1
-		force_hcd_device_descriptor(dev);
-	}
-
-	usbi_sanitize_device(dev);
-
-	usbi_dbg("(bus: %d, addr: %d, depth: %d, port: %d): '%s'",
-		dev->bus_number, dev->device_address, priv->depth, priv->port, device_id);
-
-	return LIBUSB_SUCCESS;
-}
-
-// Returns the api type, or 0 if not found/unsupported
-static void get_api_type(struct libusb_context *ctx, HDEVINFO *dev_info,
-	SP_DEVINFO_DATA *dev_info_data, int *api, int *sub_api)
-{
-	// Precedence for filter drivers vs driver is in the order of this array
-	struct driver_lookup lookup[3] = {
-		{"\0\0", SPDRP_SERVICE, "driver"},
-		{"\0\0", SPDRP_UPPERFILTERS, "upper filter driver"},
-		{"\0\0", SPDRP_LOWERFILTERS, "lower filter driver"}
-	};
-	DWORD size, reg_type;
-	unsigned k, l;
-	int i, j;
-
-	*api = USB_API_UNSUPPORTED;
-	*sub_api = SUB_API_NOTSET;
-	// Check the service & filter names to know the API we should use
-	for (k=0; k<3; k++) {
-		if (pSetupDiGetDeviceRegistryPropertyA(*dev_info, dev_info_data, lookup[k].reg_prop,
-			&reg_type, (BYTE*)lookup[k].list, MAX_KEY_LENGTH, &size)) {
-			// Turn the REG_SZ SPDRP_SERVICE into REG_MULTI_SZ
-			if (lookup[k].reg_prop == SPDRP_SERVICE) {
-				// our buffers are MAX_KEY_LENGTH+1 so we can overflow if needed
-				lookup[k].list[safe_strlen(lookup[k].list)+1] = 0;
-			}
-			// MULTI_SZ is a pain to work with. Turn it into something much more manageable
-			// NB: none of the driver names we check against contain LIST_SEPARATOR,
-			// (currently ';'), so even if an unsuported one does, it's not an issue
-			for (l=0; (lookup[k].list[l] != 0) || (lookup[k].list[l+1] != 0); l++) {
-				if (lookup[k].list[l] == 0) {
-					lookup[k].list[l] = LIST_SEPARATOR;
-				}
-			}
-			usbi_dbg("%s(s): %s", lookup[k].designation, lookup[k].list);
-		} else {
-			if (GetLastError() != ERROR_INVALID_DATA) {
-				usbi_dbg("could not access %s: %s", lookup[k].designation, windows_error_str(0));
-			}
-			lookup[k].list[0] = 0;
-		}
-	}
-
-	for (i=1; i<USB_API_MAX; i++) {
-		for (k=0; k<3; k++) {
-			j = get_sub_api(lookup[k].list, i);
-			if (j >= 0) {
-				usbi_dbg("matched %s name against %s API", 
-					lookup[k].designation, (i!=USB_API_WINUSBX)?usb_api_backend[i].designation:sub_api_name[j]);
-				*api = i;
-				*sub_api = j;
-				return;
-			}
-		}
-	}
-}
-
-static int set_composite_interface(struct libusb_context* ctx, struct libusb_device* dev,
-							char* dev_interface_path, char* device_id, int api, int sub_api)
-{
-	unsigned i;
-	struct windows_device_priv *priv = _device_priv(dev);
-	int interface_number;
-
-	if (priv->apib->id != USB_API_COMPOSITE) {
-		usbi_err(ctx, "program assertion failed: '%s' is not composite", device_id);
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	// Because MI_## are not necessarily in sequential order (some composite
-	// devices will have only MI_00 & MI_03 for instance), we retrieve the actual
-	// interface number from the path's MI value
-	interface_number = 0;
-	for (i=0; device_id[i] != 0; ) {
-		if ( (device_id[i++] == 'M') && (device_id[i++] == 'I')
-		  && (device_id[i++] == '_') ) {
-			interface_number = (device_id[i++] - '0')*10;
-			interface_number += device_id[i] - '0';
-			break;
-		}
-	}
-
-	if (device_id[i] == 0) {
-		usbi_warn(ctx, "failure to read interface number for %s. Using default value %d",
-			device_id, interface_number);
-	}
-
-	if (priv->usb_interface[interface_number].path != NULL) {
-		if (api == USB_API_HID) {
-			// HID devices can have multiple collections (COL##) for each MI_## interface
-			usbi_dbg("interface[%d] already set - ignoring HID collection: %s",
-				interface_number, device_id);
-			return LIBUSB_ERROR_ACCESS;
-		}
-		// In other cases, just use the latest data
-		safe_free(priv->usb_interface[interface_number].path);
-	}
-
-	usbi_dbg("interface[%d] = %s", interface_number, dev_interface_path);
-	priv->usb_interface[interface_number].path = dev_interface_path;
-	priv->usb_interface[interface_number].apib = &usb_api_backend[api];
-	priv->usb_interface[interface_number].sub_api = sub_api;
-	if ((api == USB_API_HID) && (priv->hid == NULL)) {
-		priv->hid = (struct hid_device_priv*) calloc(1, sizeof(struct hid_device_priv));
-		if (priv->hid == NULL)
-			return LIBUSB_ERROR_NO_MEM;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-static int set_hid_interface(struct libusb_context* ctx, struct libusb_device* dev,
-							char* dev_interface_path)
-{
-	int i;
-	struct windows_device_priv *priv = _device_priv(dev);
-
-	if (priv->hid == NULL) {
-		usbi_err(ctx, "program assertion failed: parent is not HID");
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-	if (priv->hid->nb_interfaces == USB_MAXINTERFACES) {
-		usbi_err(ctx, "program assertion failed: max USB interfaces reached for HID device");
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-	for (i=0; i<priv->hid->nb_interfaces; i++) {
-		if (safe_strcmp(priv->usb_interface[i].path, dev_interface_path) == 0) {
-			usbi_dbg("interface[%d] already set to %s", i, dev_interface_path);
-			return LIBUSB_SUCCESS;
-		}
-	}
-
-	priv->usb_interface[priv->hid->nb_interfaces].path = dev_interface_path;
-	priv->usb_interface[priv->hid->nb_interfaces].apib = &usb_api_backend[USB_API_HID];
-	usbi_dbg("interface[%d] = %s", priv->hid->nb_interfaces, dev_interface_path);
-	priv->hid->nb_interfaces++;
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * get_device_list: libusbx backend device enumeration function
- */
-static int windows_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs)
-{
-	struct discovered_devs *discdevs;
-	HDEVINFO dev_info = { 0 };
-	const char* usb_class[] = {"USB", "NUSB3", "IUSB3"};
-	SP_DEVINFO_DATA dev_info_data = { 0 };
-	SP_DEVICE_INTERFACE_DETAIL_DATA_A *dev_interface_details = NULL;
-	GUID hid_guid;
-#define MAX_ENUM_GUIDS 64
-	const GUID* guid[MAX_ENUM_GUIDS];
-#define HCD_PASS 0
-#define HUB_PASS 1
-#define GEN_PASS 2
-#define DEV_PASS 3
-#define HID_PASS 4
-	int r = LIBUSB_SUCCESS;
-	int api, sub_api;
-	size_t class_index = 0;
-	unsigned int nb_guids, pass, i, j, ancestor;
-	char path[MAX_PATH_LENGTH];
-	char strbuf[MAX_PATH_LENGTH];
-	struct libusb_device *dev, *parent_dev;
-	struct windows_device_priv *priv, *parent_priv;
-	char* dev_interface_path = NULL;
-	char* dev_id_path = NULL;
-	unsigned long session_id;
-	DWORD size, reg_type, port_nr, install_state;
-	HKEY key;
-	WCHAR guid_string_w[MAX_GUID_STRING_LENGTH];
-	GUID* if_guid;
-	LONG s;
-	// Keep a list of newly allocated devs to unref
-	libusb_device** unref_list;
-	unsigned int unref_size = 64;
-	unsigned int unref_cur = 0;
-
-	// PASS 1 : (re)enumerate HCDs (allows for HCD hotplug)
-	// PASS 2 : (re)enumerate HUBS
-	// PASS 3 : (re)enumerate generic USB devices (including driverless)
-	//           and list additional USB device interface GUIDs to explore
-	// PASS 4 : (re)enumerate master USB devices that have a device interface
-	// PASS 5+: (re)enumerate device interfaced GUIDs (including HID) and
-	//           set the device interfaces.
-
-	// Init the GUID table
-	guid[HCD_PASS] = &GUID_DEVINTERFACE_USB_HOST_CONTROLLER;
-	guid[HUB_PASS] = &GUID_DEVINTERFACE_USB_HUB;
-	guid[GEN_PASS] = NULL;
-	guid[DEV_PASS] = &GUID_DEVINTERFACE_USB_DEVICE;
-	HidD_GetHidGuid(&hid_guid);
-	guid[HID_PASS] = &hid_guid;
-	nb_guids = HID_PASS+1;
-
-	unref_list = (libusb_device**) calloc(unref_size, sizeof(libusb_device*));
-	if (unref_list == NULL) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	for (pass = 0; ((pass < nb_guids) && (r == LIBUSB_SUCCESS)); pass++) {
-//#define ENUM_DEBUG
-#ifdef ENUM_DEBUG
-		const char *passname[] = { "HCD", "HUB", "GEN", "DEV", "HID", "EXT" };
-		usbi_dbg("\n#### PROCESSING %ss %s", passname[(pass<=HID_PASS)?pass:HID_PASS+1],
-			(pass!=GEN_PASS)?guid_to_string(guid[pass]):"");
-#endif
-		for (i = 0; ; i++) {
-			// safe loop: free up any (unprotected) dynamic resource
-			// NB: this is always executed before breaking the loop
-			safe_free(dev_interface_details);
-			safe_free(dev_interface_path);
-			safe_free(dev_id_path);
-			priv = parent_priv = NULL;
-			dev = parent_dev = NULL;
-
-			// Safe loop: end of loop conditions
-			if (r != LIBUSB_SUCCESS) {
-				break;
-			}
-			if ((pass == HCD_PASS) && (i == UINT8_MAX)) {
-				usbi_warn(ctx, "program assertion failed - found more than %d buses, skipping the rest.", UINT8_MAX);
-				break;
-			}
-			if (pass != GEN_PASS) {
-				// Except for GEN, all passes deal with device interfaces
-				dev_interface_details = get_interface_details(ctx, &dev_info, &dev_info_data, guid[pass], i);
-				if (dev_interface_details == NULL) {
-					break;
-				} else {
-					dev_interface_path = sanitize_path(dev_interface_details->DevicePath);
-					if (dev_interface_path == NULL) {
-						usbi_warn(ctx, "could not sanitize device interface path for '%s'", dev_interface_details->DevicePath);
-						continue;
-					}
-				}
-			} else {
-				// Workaround for a Nec/Renesas USB 3.0 driver bug where root hubs are
-				// being listed under the "NUSB3" PnP Symbolic Name rather than "USB".
-				// The Intel USB 3.0 driver behaves similar, but uses "IUSB3"
-				for (; class_index < ARRAYSIZE(usb_class); class_index++) {
-					if (get_devinfo_data(ctx, &dev_info, &dev_info_data, usb_class[class_index], i))
-						break;
-					i = 0;
-				}
-				if (class_index >= ARRAYSIZE(usb_class))
-					break;
-			}
-
-			// Read the Device ID path. This is what we'll use as UID
-			// Note that if the device is plugged in a different port or hub, the Device ID changes
-			if (CM_Get_Device_IDA(dev_info_data.DevInst, path, sizeof(path), 0) != CR_SUCCESS) {
-				usbi_warn(ctx, "could not read the device id path for devinst %X, skipping",
-					dev_info_data.DevInst);
-				continue;
-			}
-			dev_id_path = sanitize_path(path);
-			if (dev_id_path == NULL) {
-				usbi_warn(ctx, "could not sanitize device id path for devinst %X, skipping",
-					dev_info_data.DevInst);
-				continue;
-			}
-#ifdef ENUM_DEBUG
-			usbi_dbg("PRO: %s", dev_id_path);
-#endif
-
-			// The SPDRP_ADDRESS for USB devices is the device port number on the hub
-			port_nr = 0;
-			if ((pass >= HUB_PASS) && (pass <= GEN_PASS)) {
-				if ( (!pSetupDiGetDeviceRegistryPropertyA(dev_info, &dev_info_data, SPDRP_ADDRESS,
-					&reg_type, (BYTE*)&port_nr, 4, &size))
-				  || (size != 4) ) {
-					usbi_warn(ctx, "could not retrieve port number for device '%s', skipping: %s",
-						dev_id_path, windows_error_str(0));
-					continue;
-				}
-			}
-
-			// Set API to use or get additional data from generic pass
-			api = USB_API_UNSUPPORTED;
-			sub_api = SUB_API_NOTSET;
-			switch (pass) {
-			case HCD_PASS:
-				break;
-			case GEN_PASS:
-				// We use the GEN pass to detect driverless devices...
-				size = sizeof(strbuf);
-				if (!pSetupDiGetDeviceRegistryPropertyA(dev_info, &dev_info_data, SPDRP_DRIVER,
-					&reg_type, (BYTE*)strbuf, size, &size)) {
-						usbi_info(ctx, "The following device has no driver: '%s'", dev_id_path);
-						usbi_info(ctx, "libusbx will not be able to access it.");
-				}
-				// ...and to add the additional device interface GUIDs
-				key = pSetupDiOpenDevRegKey(dev_info, &dev_info_data, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_READ);
-				if (key != INVALID_HANDLE_VALUE) {
-					size = sizeof(guid_string_w);
-					s = pRegQueryValueExW(key, L"DeviceInterfaceGUIDs", NULL, &reg_type,
-						(BYTE*)guid_string_w, &size);
-					pRegCloseKey(key);
-					if (s == ERROR_SUCCESS) {
-						if (nb_guids >= MAX_ENUM_GUIDS) {
-							// If this assert is ever reported, grow a GUID table dynamically
-							usbi_err(ctx, "program assertion failed: too many GUIDs");
-							LOOP_BREAK(LIBUSB_ERROR_OVERFLOW);
-						}
-						if_guid = (GUID*) calloc(1, sizeof(GUID));
-						pCLSIDFromString(guid_string_w, if_guid);
-						guid[nb_guids++] = if_guid;
-						usbi_dbg("extra GUID: %s", guid_to_string(if_guid));
-					}
-				}
-				break;
-			case HID_PASS:
-				api = USB_API_HID;
-				break;
-			default:
-				// Get the API type (after checking that the driver installation is OK)
-				if ( (!pSetupDiGetDeviceRegistryPropertyA(dev_info, &dev_info_data, SPDRP_INSTALL_STATE,
-					&reg_type, (BYTE*)&install_state, 4, &size))
-				  || (size != 4) ){
-					usbi_warn(ctx, "could not detect installation state of driver for '%s': %s",
-						dev_id_path, windows_error_str(0));
-				} else if (install_state != 0) {
-					usbi_warn(ctx, "driver for device '%s' is reporting an issue (code: %d) - skipping",
-						dev_id_path, install_state);
-					continue;
-				}
-				get_api_type(ctx, &dev_info, &dev_info_data, &api, &sub_api);
-				break;
-			}
-
-			// Find parent device (for the passes that need it)
-			switch (pass) {
-			case HCD_PASS:
-			case DEV_PASS:
-			case HUB_PASS:
-				break;
-			default:
-				// Go through the ancestors until we see a face we recognize
-				parent_dev = NULL;
-				for (ancestor = 1; parent_dev == NULL; ancestor++) {
-					session_id = get_ancestor_session_id(dev_info_data.DevInst, ancestor);
-					if (session_id == 0) {
-						break;
-					}
-					parent_dev = usbi_get_device_by_session_id(ctx, session_id);
-				}
-				if (parent_dev == NULL) {
-					usbi_dbg("unlisted ancestor for '%s' (non USB HID, newly connected, etc.) - ignoring", dev_id_path);
-					continue;
-				}
-				parent_priv = _device_priv(parent_dev);
-				// virtual USB devices are also listed during GEN - don't process these yet
-				if ( (pass == GEN_PASS) && (parent_priv->apib->id != USB_API_HUB) ) {
-					continue;
-				}
-				break;
-			}
-
-			// Create new or match existing device, using the (hashed) device_id as session id
-			if (pass <= DEV_PASS) {	// For subsequent passes, we'll lookup the parent
-				// These are the passes that create "new" devices
-				session_id = htab_hash(dev_id_path);
-				dev = usbi_get_device_by_session_id(ctx, session_id);
-				if (dev == NULL) {
-					if (pass == DEV_PASS) {
-						// This can occur if the OS only reports a newly plugged device after we started enum
-						usbi_warn(ctx, "'%s' was only detected in late pass (newly connected device?)"
-							" - ignoring", dev_id_path);
-						continue;
-					}
-					usbi_dbg("allocating new device for session [%X]", session_id);
-					if ((dev = usbi_alloc_device(ctx, session_id)) == NULL) {
-						LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
-					}
-					windows_device_priv_init(dev);
-					// Keep track of devices that need unref
-					unref_list[unref_cur++] = dev;
-					if (unref_cur >= unref_size) {
-						unref_size += 64;
-						unref_list = usbi_reallocf(unref_list, unref_size*sizeof(libusb_device*));
-						if (unref_list == NULL) {
-							usbi_err(ctx, "could not realloc list for unref - aborting.");
-							LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
-						}
-					}
-				} else {
-					usbi_dbg("found existing device for session [%X] (%d.%d)",
-						session_id, dev->bus_number, dev->device_address);
-				}
-				priv = _device_priv(dev);
-			}
-
-			// Setup device
-			switch (pass) {
-			case HCD_PASS:
-				dev->bus_number = (uint8_t)(i + 1);	// bus 0 is reserved for disconnected
-				dev->device_address = 0;
-				dev->num_configurations = 0;
-				priv->apib = &usb_api_backend[USB_API_HUB];
-				priv->sub_api = SUB_API_NOTSET;
-				priv->depth = UINT8_MAX;	// Overflow to 0 for HCD Hubs
-				priv->path = dev_interface_path; dev_interface_path = NULL;
-				break;
-			case HUB_PASS:
-			case DEV_PASS:
-				// If the device has already been setup, don't do it again
-				if (priv->path != NULL)
-					break;
-				// Take care of API initialization
-				priv->path = dev_interface_path; dev_interface_path = NULL;
-				priv->apib = &usb_api_backend[api];
-				priv->sub_api = sub_api;
-				switch(api) {
-				case USB_API_COMPOSITE:
-				case USB_API_HUB:
-					break;
-				case USB_API_HID:
-					priv->hid = calloc(1, sizeof(struct hid_device_priv));
-					if (priv->hid == NULL) {
-						LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
-					}
-					priv->hid->nb_interfaces = 0;
-					break;
-				default:
-					// For other devices, the first interface is the same as the device
-					priv->usb_interface[0].path = (char*) calloc(safe_strlen(priv->path)+1, 1);
-					if (priv->usb_interface[0].path != NULL) {
-						safe_strcpy(priv->usb_interface[0].path, safe_strlen(priv->path)+1, priv->path);
-					} else {
-						usbi_warn(ctx, "could not duplicate interface path '%s'", priv->path);
-					}
-					// The following is needed if we want API calls to work for both simple
-					// and composite devices.
-					for(j=0; j<USB_MAXINTERFACES; j++) {
-						priv->usb_interface[j].apib = &usb_api_backend[api];
-					}
-					break;
-				}
-				break;
-			case GEN_PASS:
-				r = init_device(dev, parent_dev, (uint8_t)port_nr, dev_id_path, dev_info_data.DevInst);
-				if (r == LIBUSB_SUCCESS) {
-					// Append device to the list of discovered devices
-					discdevs = discovered_devs_append(*_discdevs, dev);
-					if (!discdevs) {
-						LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
-					}
-					*_discdevs = discdevs;
-				} else if (r == LIBUSB_ERROR_NO_DEVICE) {
-					// This can occur if the device was disconnected but Windows hasn't
-					// refreshed its enumeration yet - in that case, we ignore the device
-					r = LIBUSB_SUCCESS;
-				}
-				break;
-			default:	// HID_PASS and later
-				if (parent_priv->apib->id == USB_API_HID) {
-					usbi_dbg("setting HID interface for [%lX]:", parent_dev->session_data);
-					r = set_hid_interface(ctx, parent_dev, dev_interface_path);
-					if (r != LIBUSB_SUCCESS) LOOP_BREAK(r);
-					dev_interface_path = NULL;
-				} else if (parent_priv->apib->id == USB_API_COMPOSITE) {
-					usbi_dbg("setting composite interface for [%lX]:", parent_dev->session_data);
-					switch (set_composite_interface(ctx, parent_dev, dev_interface_path, dev_id_path, api, sub_api)) {
-					case LIBUSB_SUCCESS:
-						dev_interface_path = NULL;
-						break;
-					case LIBUSB_ERROR_ACCESS:
-						// interface has already been set => make sure dev_interface_path is freed then
-						break;
-					default:
-						LOOP_BREAK(r);
-						break;
-					}
-				}
-				break;
-			}
-		}
-	}
-
-	// Free any additional GUIDs
-	for (pass = HID_PASS+1; pass < nb_guids; pass++) {
-		safe_free(guid[pass]);
-	}
-
-	// Unref newly allocated devs
-	for (i=0; i<unref_cur; i++) {
-		safe_unref_device(unref_list[i]);
-	}
-	safe_free(unref_list);
-
-	return r;
-}
-
-/*
- * exit: libusbx backend deinitialization function
- */
-static void windows_exit(void)
-{
-	int i;
-	HANDLE semaphore;
-	char sem_name[11+1+8]; // strlen(libusb_init)+'\0'+(32-bit hex PID)
-
-	sprintf(sem_name, "libusb_init%08X", (unsigned int)GetCurrentProcessId()&0xFFFFFFFF);
-	semaphore = CreateSemaphoreA(NULL, 1, 1, sem_name);
-	if (semaphore == NULL) {
-		return;
-	}
-
-	// A successful wait brings our semaphore count to 0 (unsignaled)
-	// => any concurent wait stalls until the semaphore release
-	if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
-		CloseHandle(semaphore);
-		return;
-	}
-
-	// Only works if exits and inits are balanced exactly
-	if (--concurrent_usage < 0) {	// Last exit
-		for (i=0; i<USB_API_MAX; i++) {
-			usb_api_backend[i].exit(SUB_API_NOTSET);
-		}
-		exit_polling();
-
-		if (timer_thread) {
-			SetEvent(timer_request[1]); // actually the signal to quit the thread.
-			if (WAIT_OBJECT_0 != WaitForSingleObject(timer_thread, INFINITE)) {
-				usbi_dbg("could not wait for timer thread to quit");
-				TerminateThread(timer_thread, 1);
-			}
-			CloseHandle(timer_thread);
-			timer_thread = NULL;
-		}
-		for (i = 0; i < 2; i++) {
-			if (timer_request[i]) {
-				CloseHandle(timer_request[i]);
-				timer_request[i] = NULL;
-			}
-		}
-		if (timer_response) {
-			CloseHandle(timer_response);
-			timer_response = NULL;
-		}
-		if (timer_mutex) {
-			CloseHandle(timer_mutex);
-			timer_mutex = NULL;
-		}
-		htab_destroy();
-	}
-
-	ReleaseSemaphore(semaphore, 1, NULL);	// increase count back to 1
-	CloseHandle(semaphore);
-}
-
-static int windows_get_device_descriptor(struct libusb_device *dev, unsigned char *buffer, int *host_endian)
-{
-	struct windows_device_priv *priv = _device_priv(dev);
-
-	memcpy(buffer, &(priv->dev_descriptor), DEVICE_DESC_LENGTH);
-	*host_endian = 0;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int windows_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
-{
-	struct windows_device_priv *priv = _device_priv(dev);
-	PUSB_CONFIGURATION_DESCRIPTOR config_header;
-	size_t size;
-
-	// config index is zero based
-	if (config_index >= dev->num_configurations)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	if ((priv->config_descriptor == NULL) || (priv->config_descriptor[config_index] == NULL))
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	config_header = (PUSB_CONFIGURATION_DESCRIPTOR)priv->config_descriptor[config_index];
-
-	size = min(config_header->wTotalLength, len);
-	memcpy(buffer, priv->config_descriptor[config_index], size);
-	*host_endian = 0;
-
-	return size;
-}
-
-/*
- * return the cached copy of the active config descriptor
- */
-static int windows_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len, int *host_endian)
-{
-	struct windows_device_priv *priv = _device_priv(dev);
-
-	if (priv->active_config == 0)
-		return LIBUSB_ERROR_NOT_FOUND;
-
-	// config index is zero based
-	return windows_get_config_descriptor(dev, (uint8_t)(priv->active_config-1), buffer, len, host_endian);
-}
-
-static int windows_open(struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-
-	if (priv->apib == NULL) {
-		usbi_err(ctx, "program assertion failed - device is not initialized");
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	return priv->apib->open(SUB_API_NOTSET, dev_handle);
-}
-
-static void windows_close(struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	priv->apib->close(SUB_API_NOTSET, dev_handle);
-}
-
-static int windows_get_configuration(struct libusb_device_handle *dev_handle, int *config)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	if (priv->active_config == 0) {
-		*config = 0;
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	*config = priv->active_config;
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * from http://msdn.microsoft.com/en-us/library/ms793522.aspx: "The port driver
- * does not currently expose a service that allows higher-level drivers to set
- * the configuration."
- */
-static int windows_set_configuration(struct libusb_device_handle *dev_handle, int config)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	int r = LIBUSB_SUCCESS;
-
-	if (config >= USB_MAXCONFIG)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	r = libusb_control_transfer(dev_handle, LIBUSB_ENDPOINT_OUT |
-		LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
-		LIBUSB_REQUEST_SET_CONFIGURATION, (uint16_t)config,
-		0, NULL, 0, 1000);
-
-	if (r == LIBUSB_SUCCESS) {
-		priv->active_config = (uint8_t)config;
-	}
-	return r;
-}
-
-static int windows_claim_interface(struct libusb_device_handle *dev_handle, int iface)
-{
-	int r = LIBUSB_SUCCESS;
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	if (iface >= USB_MAXINTERFACES)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	safe_free(priv->usb_interface[iface].endpoint);
-	priv->usb_interface[iface].nb_endpoints= 0;
-
-	r = priv->apib->claim_interface(SUB_API_NOTSET, dev_handle, iface);
-
-	if (r == LIBUSB_SUCCESS) {
-		r = windows_assign_endpoints(dev_handle, iface, 0);
-	}
-
-	return r;
-}
-
-static int windows_set_interface_altsetting(struct libusb_device_handle *dev_handle, int iface, int altsetting)
-{
-	int r = LIBUSB_SUCCESS;
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	safe_free(priv->usb_interface[iface].endpoint);
-	priv->usb_interface[iface].nb_endpoints= 0;
-
-	r = priv->apib->set_interface_altsetting(SUB_API_NOTSET, dev_handle, iface, altsetting);
-
-	if (r == LIBUSB_SUCCESS) {
-		r = windows_assign_endpoints(dev_handle, iface, altsetting);
-	}
-
-	return r;
-}
-
-static int windows_release_interface(struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	return priv->apib->release_interface(SUB_API_NOTSET, dev_handle, iface);
-}
-
-static int windows_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	return priv->apib->clear_halt(SUB_API_NOTSET, dev_handle, endpoint);
-}
-
-static int windows_reset_device(struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	return priv->apib->reset_device(SUB_API_NOTSET, dev_handle);
-}
-
-// The 3 functions below are unlikely to ever get supported on Windows
-static int windows_kernel_driver_active(struct libusb_device_handle *dev_handle, int iface)
-{
-	return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static int windows_attach_kernel_driver(struct libusb_device_handle *dev_handle, int iface)
-{
-	return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static int windows_detach_kernel_driver(struct libusb_device_handle *dev_handle, int iface)
-{
-	return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static void windows_destroy_device(struct libusb_device *dev)
-{
-	windows_device_priv_release(dev);
-}
-
-static void windows_clear_transfer_priv(struct usbi_transfer *itransfer)
-{
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-
-	usbi_free_fd(&transfer_priv->pollable_fd);
-	safe_free(transfer_priv->hid_buffer);
-	// When auto claim is in use, attempt to release the auto-claimed interface
-	auto_release(itransfer);
-}
-
-static int submit_bulk_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int r;
-
-	r = priv->apib->submit_bulk_transfer(SUB_API_NOTSET, itransfer);
-	if (r != LIBUSB_SUCCESS) {
-		return r;
-	}
-
-	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd,
-		(short)(IS_XFERIN(transfer) ? POLLIN : POLLOUT));
-
-	itransfer->flags |= USBI_TRANSFER_UPDATED_FDS;
-	return LIBUSB_SUCCESS;
-}
-
-static int submit_iso_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int r;
-
-	r = priv->apib->submit_iso_transfer(SUB_API_NOTSET, itransfer);
-	if (r != LIBUSB_SUCCESS) {
-		return r;
-	}
-
-	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd,
-		(short)(IS_XFERIN(transfer) ? POLLIN : POLLOUT));
-
-	itransfer->flags |= USBI_TRANSFER_UPDATED_FDS;
-	return LIBUSB_SUCCESS;
-}
-
-static int submit_control_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int r;
-
-	r = priv->apib->submit_control_transfer(SUB_API_NOTSET, itransfer);
-	if (r != LIBUSB_SUCCESS) {
-		return r;
-	}
-
-	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, POLLIN);
-
-	itransfer->flags |= USBI_TRANSFER_UPDATED_FDS;
-	return LIBUSB_SUCCESS;
-
-}
-
-static int windows_submit_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-		return submit_control_transfer(itransfer);
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-		if (IS_XFEROUT(transfer) &&
-		    transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET)
-			return LIBUSB_ERROR_NOT_SUPPORTED;
-		return submit_bulk_transfer(itransfer);
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		return submit_iso_transfer(itransfer);
-	default:
-		usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-}
-
-static int windows_abort_control(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-
-	return priv->apib->abort_control(SUB_API_NOTSET, itransfer);
-}
-
-static int windows_abort_transfers(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-
-	return priv->apib->abort_transfers(SUB_API_NOTSET, itransfer);
-}
-
-static int windows_cancel_transfer(struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-		return windows_abort_control(itransfer);
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		return windows_abort_transfers(itransfer);
-	default:
-		usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-}
-
-static void windows_transfer_callback(struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int status, istatus;
-
-	usbi_dbg("handling I/O completion with errcode %d, size %d", io_result, io_size);
-
-	switch(io_result) {
-	case NO_ERROR:
-		status = priv->apib->copy_transfer_data(SUB_API_NOTSET, itransfer, io_size);
-		break;
-	case ERROR_GEN_FAILURE:
-		usbi_dbg("detected endpoint stall");
-		status = LIBUSB_TRANSFER_STALL;
-		break;
-	case ERROR_SEM_TIMEOUT:
-		usbi_dbg("detected semaphore timeout");
-		status = LIBUSB_TRANSFER_TIMED_OUT;
-		break;
-	case ERROR_OPERATION_ABORTED:
-		istatus = priv->apib->copy_transfer_data(SUB_API_NOTSET, itransfer, io_size);
-		if (istatus != LIBUSB_TRANSFER_COMPLETED) {
-			usbi_dbg("Failed to copy partial data in aborted operation: %d", istatus);
-		}
-		if (itransfer->flags & USBI_TRANSFER_TIMED_OUT) {
-			usbi_dbg("detected timeout");
-			status = LIBUSB_TRANSFER_TIMED_OUT;
-		} else {
-			usbi_dbg("detected operation aborted");
-			status = LIBUSB_TRANSFER_CANCELLED;
-		}
-		break;
-	default:
-		usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error %d: %s", io_result, windows_error_str(0));
-		status = LIBUSB_TRANSFER_ERROR;
-		break;
-	}
-	windows_clear_transfer_priv(itransfer);	// Cancel polling
-	usbi_handle_transfer_completion(itransfer, (enum libusb_transfer_status)status);
-}
-
-static void windows_handle_callback (struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-	switch (transfer->type) {
-	case LIBUSB_TRANSFER_TYPE_CONTROL:
-	case LIBUSB_TRANSFER_TYPE_BULK:
-	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-		windows_transfer_callback (itransfer, io_result, io_size);
-		break;
-	default:
-		usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
-	}
-}
-
-static int windows_handle_events(struct libusb_context *ctx, struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
-{
-	struct windows_transfer_priv* transfer_priv = NULL;
-	POLL_NFDS_TYPE i = 0;
-	bool found = false;
-	struct usbi_transfer *transfer;
-	DWORD io_size, io_result;
-
-	usbi_mutex_lock(&ctx->open_devs_lock);
-	for (i = 0; i < nfds && num_ready > 0; i++) {
-
-		usbi_dbg("checking fd %d with revents = %04x", fds[i].fd, fds[i].revents);
-
-		if (!fds[i].revents) {
-			continue;
-		}
-
-		num_ready--;
-
-		// Because a Windows OVERLAPPED is used for poll emulation,
-		// a pollable fd is created and stored with each transfer
-		usbi_mutex_lock(&ctx->flying_transfers_lock);
-		list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
-			transfer_priv = usbi_transfer_get_os_priv(transfer);
-			if (transfer_priv->pollable_fd.fd == fds[i].fd) {
-				found = true;
-				break;
-			}
-		}
-		usbi_mutex_unlock(&ctx->flying_transfers_lock);
-
-		if (found) {
-			// Handle async requests that completed synchronously first
-			if (HasOverlappedIoCompletedSync(transfer_priv->pollable_fd.overlapped)) {
-				io_result = NO_ERROR;
-				io_size = (DWORD)transfer_priv->pollable_fd.overlapped->InternalHigh;
-			// Regular async overlapped
-			} else if (GetOverlappedResult(transfer_priv->pollable_fd.handle,
-				transfer_priv->pollable_fd.overlapped, &io_size, false)) {
-				io_result = NO_ERROR;
-			} else {
-				io_result = GetLastError();
-			}
-			usbi_remove_pollfd(ctx, transfer_priv->pollable_fd.fd);
-			// let handle_callback free the event using the transfer wfd
-			// If you don't use the transfer wfd, you run a risk of trying to free a
-			// newly allocated wfd that took the place of the one from the transfer.
-			windows_handle_callback(transfer, io_result, io_size);
-		} else {
-			usbi_err(ctx, "could not find a matching transfer for fd %x", fds[i]);
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-	}
-
-	usbi_mutex_unlock(&ctx->open_devs_lock);
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * Monotonic and real time functions
- */
-unsigned __stdcall windows_clock_gettime_threaded(void* param)
-{
-	LARGE_INTEGER hires_counter, li_frequency;
-	LONG nb_responses;
-	int timer_index;
-
-	// Init - find out if we have access to a monotonic (hires) timer
-	if (!QueryPerformanceFrequency(&li_frequency)) {
-		usbi_dbg("no hires timer available on this platform");
-		hires_frequency = 0;
-		hires_ticks_to_ps = UINT64_C(0);
-	} else {
-		hires_frequency = li_frequency.QuadPart;
-		// The hires frequency can go as high as 4 GHz, so we'll use a conversion
-		// to picoseconds to compute the tv_nsecs part in clock_gettime
-		hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
-		usbi_dbg("hires timer available (Frequency: %"PRIu64" Hz)", hires_frequency);
-	}
-
-	// Main loop - wait for requests
-	while (1) {
-		timer_index = WaitForMultipleObjects(2, timer_request, FALSE, INFINITE) - WAIT_OBJECT_0;
-		if ( (timer_index != 0) && (timer_index != 1) ) {
-			usbi_dbg("failure to wait on requests: %s", windows_error_str(0));
-			continue;
-		}
-		if (request_count[timer_index] == 0) {
-			// Request already handled
-			ResetEvent(timer_request[timer_index]);
-			// There's still a possiblity that a thread sends a request between the
-			// time we test request_count[] == 0 and we reset the event, in which case
-			// the request would be ignored. The simple solution to that is to test
-			// request_count again and process requests if non zero.
-			if (request_count[timer_index] == 0)
-				continue;
-		}
-		switch (timer_index) {
-		case 0:
-			WaitForSingleObject(timer_mutex, INFINITE);
-			// Requests to this thread are for hires always
-			if (QueryPerformanceCounter(&hires_counter) != 0) {
-				timer_tp.tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
-				timer_tp.tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency)/1000) * hires_ticks_to_ps);
-			} else {
-				// Fallback to real-time if we can't get monotonic value
-				// Note that real-time clock does not wait on the mutex or this thread.
-				windows_clock_gettime(USBI_CLOCK_REALTIME, &timer_tp);
-			}
-			ReleaseMutex(timer_mutex);
-
-			nb_responses = InterlockedExchange((LONG*)&request_count[0], 0);
-			if ( (nb_responses)
-			  && (ReleaseSemaphore(timer_response, nb_responses, NULL) == 0) ) {
-				usbi_dbg("unable to release timer semaphore %d: %s", windows_error_str(0));
-			}
-			continue;
-		case 1: // time to quit
-			usbi_dbg("timer thread quitting");
-			return 0;
-		}
-	}
-}
-
-static int windows_clock_gettime(int clk_id, struct timespec *tp)
-{
-	FILETIME filetime;
-	ULARGE_INTEGER rtime;
-	DWORD r;
-	switch(clk_id) {
-	case USBI_CLOCK_MONOTONIC:
-		if (hires_frequency != 0) {
-			while (1) {
-				InterlockedIncrement((LONG*)&request_count[0]);
-				SetEvent(timer_request[0]);
-				r = WaitForSingleObject(timer_response, TIMER_REQUEST_RETRY_MS);
-				switch(r) {
-				case WAIT_OBJECT_0:
-					WaitForSingleObject(timer_mutex, INFINITE);
-					*tp = timer_tp;
-					ReleaseMutex(timer_mutex);
-					return LIBUSB_SUCCESS;
-				case WAIT_TIMEOUT:
-					usbi_dbg("could not obtain a timer value within reasonable timeframe - too much load?");
-					break; // Retry until successful
-				default:
-					usbi_dbg("WaitForSingleObject failed: %s", windows_error_str(0));
-					return LIBUSB_ERROR_OTHER;
-				}
-			}
-		}
-		// Fall through and return real-time if monotonic was not detected @ timer init
-	case USBI_CLOCK_REALTIME:
-		// We follow http://msdn.microsoft.com/en-us/library/ms724928%28VS.85%29.aspx
-		// with a predef epoch_time to have an epoch that starts at 1970.01.01 00:00
-		// Note however that our resolution is bounded by the Windows system time
-		// functions and is at best of the order of 1 ms (or, usually, worse)
-		GetSystemTimeAsFileTime(&filetime);
-		rtime.LowPart = filetime.dwLowDateTime;
-		rtime.HighPart = filetime.dwHighDateTime;
-		rtime.QuadPart -= epoch_time;
-		tp->tv_sec = (long)(rtime.QuadPart / 10000000);
-		tp->tv_nsec = (long)((rtime.QuadPart % 10000000)*100);
-		return LIBUSB_SUCCESS;
-	default:
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-}
-
-
-// NB: MSVC6 does not support named initializers.
-const struct usbi_os_backend windows_backend = {
-	"Windows",
-	USBI_CAP_HAS_HID_ACCESS,
-	windows_init,
-	windows_exit,
-
-	windows_get_device_list,
-	NULL,				/* hotplug_poll */
-	windows_open,
-	windows_close,
-
-	windows_get_device_descriptor,
-	windows_get_active_config_descriptor,
-	windows_get_config_descriptor,
-	NULL,				/* get_config_descriptor_by_value() */
-
-	windows_get_configuration,
-	windows_set_configuration,
-	windows_claim_interface,
-	windows_release_interface,
-
-	windows_set_interface_altsetting,
-	windows_clear_halt,
-	windows_reset_device,
-
-	windows_kernel_driver_active,
-	windows_detach_kernel_driver,
-	windows_attach_kernel_driver,
-
-	windows_destroy_device,
-
-	windows_submit_transfer,
-	windows_cancel_transfer,
-	windows_clear_transfer_priv,
-
-	windows_handle_events,
-
-	windows_clock_gettime,
-#if defined(USBI_TIMERFD_AVAILABLE)
-	NULL,
-#endif
-	sizeof(struct windows_device_priv),
-	sizeof(struct windows_device_handle_priv),
-	sizeof(struct windows_transfer_priv),
-	0,
-};
-
-
-/*
- * USB API backends
- */
-static int unsupported_init(int sub_api, struct libusb_context *ctx) {
-	return LIBUSB_SUCCESS;
-}
-static int unsupported_exit(int sub_api) {
-	return LIBUSB_SUCCESS;
-}
-static int unsupported_open(int sub_api, struct libusb_device_handle *dev_handle) {
-	PRINT_UNSUPPORTED_API(open);
-}
-static void unsupported_close(int sub_api, struct libusb_device_handle *dev_handle) {
-	usbi_dbg("unsupported API call for 'close'");
-}
-static int unsupported_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface) {
-	PRINT_UNSUPPORTED_API(configure_endpoints);
-}
-static int unsupported_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) {
-	PRINT_UNSUPPORTED_API(claim_interface);
-}
-static int unsupported_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting) {
-	PRINT_UNSUPPORTED_API(set_interface_altsetting);
-}
-static int unsupported_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) {
-	PRINT_UNSUPPORTED_API(release_interface);
-}
-static int unsupported_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint) {
-	PRINT_UNSUPPORTED_API(clear_halt);
-}
-static int unsupported_reset_device(int sub_api, struct libusb_device_handle *dev_handle) {
-	PRINT_UNSUPPORTED_API(reset_device);
-}
-static int unsupported_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer) {
-	PRINT_UNSUPPORTED_API(submit_bulk_transfer);
-}
-static int unsupported_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer) {
-	PRINT_UNSUPPORTED_API(submit_iso_transfer);
-}
-static int unsupported_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer) {
-	PRINT_UNSUPPORTED_API(submit_control_transfer);
-}
-static int unsupported_abort_control(int sub_api, struct usbi_transfer *itransfer) {
-	PRINT_UNSUPPORTED_API(abort_control);
-}
-static int unsupported_abort_transfers(int sub_api, struct usbi_transfer *itransfer) {
-	PRINT_UNSUPPORTED_API(abort_transfers);
-}
-static int unsupported_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size) {
-	PRINT_UNSUPPORTED_API(copy_transfer_data);
-}
-static int common_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface) {
-	return LIBUSB_SUCCESS;
-}
-// These names must be uppercase
-const char* hub_driver_names[] = {"USBHUB", "USBHUB3", "NUSB3HUB", "RUSB3HUB", "FLXHCIH", "TIHUB3", "ETRONHUB3", "VIAHUB3", "ASMTHUB3", "IUSB3HUB"};
-const char* composite_driver_names[] = {"USBCCGP"};
-const char* winusbx_driver_names[] = WINUSBX_DRV_NAMES;
-const char* hid_driver_names[] = {"HIDUSB", "MOUHID", "KBDHID"};
-const struct windows_usb_api_backend usb_api_backend[USB_API_MAX] = {
-	{
-		USB_API_UNSUPPORTED,
-		"Unsupported API",
-		NULL,
-		0,
-		unsupported_init,
-		unsupported_exit,
-		unsupported_open,
-		unsupported_close,
-		unsupported_configure_endpoints,
-		unsupported_claim_interface,
-		unsupported_set_interface_altsetting,
-		unsupported_release_interface,
-		unsupported_clear_halt,
-		unsupported_reset_device,
-		unsupported_submit_bulk_transfer,
-		unsupported_submit_iso_transfer,
-		unsupported_submit_control_transfer,
-		unsupported_abort_control,
-		unsupported_abort_transfers,
-		unsupported_copy_transfer_data,
-	}, {
-		USB_API_HUB,
-		"HUB API",
-		hub_driver_names,
-		ARRAYSIZE(hub_driver_names),
-		unsupported_init,
-		unsupported_exit,
-		unsupported_open,
-		unsupported_close,
-		unsupported_configure_endpoints,
-		unsupported_claim_interface,
-		unsupported_set_interface_altsetting,
-		unsupported_release_interface,
-		unsupported_clear_halt,
-		unsupported_reset_device,
-		unsupported_submit_bulk_transfer,
-		unsupported_submit_iso_transfer,
-		unsupported_submit_control_transfer,
-		unsupported_abort_control,
-		unsupported_abort_transfers,
-		unsupported_copy_transfer_data,
-	}, {
-		USB_API_COMPOSITE,
-		"Composite API",
-		composite_driver_names,
-		ARRAYSIZE(composite_driver_names),
-		composite_init,
-		composite_exit,
-		composite_open,
-		composite_close,
-		common_configure_endpoints,
-		composite_claim_interface,
-		composite_set_interface_altsetting,
-		composite_release_interface,
-		composite_clear_halt,
-		composite_reset_device,
-		composite_submit_bulk_transfer,
-		composite_submit_iso_transfer,
-		composite_submit_control_transfer,
-		composite_abort_control,
-		composite_abort_transfers,
-		composite_copy_transfer_data,
-	}, {
-		USB_API_WINUSBX,
-		"WinUSB-like APIs",
-		winusbx_driver_names,
-		ARRAYSIZE(winusbx_driver_names),
-		winusbx_init,
-		winusbx_exit,
-		winusbx_open,
-		winusbx_close,
-		winusbx_configure_endpoints,
-		winusbx_claim_interface,
-		winusbx_set_interface_altsetting,
-		winusbx_release_interface,
-		winusbx_clear_halt,
-		winusbx_reset_device,
-		winusbx_submit_bulk_transfer,
-		unsupported_submit_iso_transfer,
-		winusbx_submit_control_transfer,
-		winusbx_abort_control,
-		winusbx_abort_transfers,
-		winusbx_copy_transfer_data,
-	}, {
-		USB_API_HID,
-		"HID API",
-		hid_driver_names,
-		ARRAYSIZE(hid_driver_names),
-		hid_init,
-		hid_exit,
-		hid_open,
-		hid_close,
-		common_configure_endpoints,
-		hid_claim_interface,
-		hid_set_interface_altsetting,
-		hid_release_interface,
-		hid_clear_halt,
-		hid_reset_device,
-		hid_submit_bulk_transfer,
-		unsupported_submit_iso_transfer,
-		hid_submit_control_transfer,
-		hid_abort_transfers,
-		hid_abort_transfers,
-		hid_copy_transfer_data,
-	},
-};
-
-
-/*
- * WinUSB-like (WinUSB, libusb0/libusbK through libusbk DLL) API functions
- */
-#define WinUSBX_Set(fn) do { if (native_winusb) WinUSBX[i].fn = (WinUsb_##fn##_t) GetProcAddress(h, "WinUsb_" #fn); \
-	else pLibK_GetProcAddress((PVOID*)&WinUSBX[i].fn, i, KUSB_FNID_##fn); } while (0)
-
-static int winusbx_init(int sub_api, struct libusb_context *ctx)
-{
-	HMODULE h = NULL;
-	bool native_winusb = false;
-	int i;
-	KLIB_VERSION LibK_Version;
-	LibK_GetProcAddress_t pLibK_GetProcAddress = NULL;
-	LibK_GetVersion_t pLibK_GetVersion = NULL;
-
-	h = GetModuleHandleA("libusbK");
-	if (h == NULL) {
-		h = LoadLibraryA("libusbK");
-	}
-	if (h == NULL) {
-		usbi_info(ctx, "libusbK DLL is not available, will use native WinUSB");
-		h = GetModuleHandleA("WinUSB");
-		if (h == NULL) {
-			h = LoadLibraryA("WinUSB");
-		}		if (h == NULL) {
-			usbi_warn(ctx, "WinUSB DLL is not available either,\n"
-				"you will not be able to access devices outside of enumeration");
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-	} else {
-		usbi_dbg("using libusbK DLL for universal access");
-		pLibK_GetVersion = (LibK_GetVersion_t) GetProcAddress(h, "LibK_GetVersion");
-		if (pLibK_GetVersion != NULL) {
-			pLibK_GetVersion(&LibK_Version);
-			usbi_dbg("libusbK version: %d.%d.%d.%d", LibK_Version.Major, LibK_Version.Minor,
-				LibK_Version.Micro, LibK_Version.Nano);
-		}
-		pLibK_GetProcAddress = (LibK_GetProcAddress_t) GetProcAddress(h, "LibK_GetProcAddress");
-		if (pLibK_GetProcAddress == NULL) {
-			usbi_err(ctx, "LibK_GetProcAddress() not found in libusbK DLL");
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-	}
-	native_winusb = (pLibK_GetProcAddress == NULL);
-	for (i=SUB_API_LIBUSBK; i<SUB_API_MAX; i++) {
-		WinUSBX_Set(AbortPipe);
-		WinUSBX_Set(ControlTransfer);
-		WinUSBX_Set(FlushPipe);
-		WinUSBX_Set(Free);
-		WinUSBX_Set(GetAssociatedInterface);
-		WinUSBX_Set(GetCurrentAlternateSetting);
-		WinUSBX_Set(GetDescriptor);
-		WinUSBX_Set(GetOverlappedResult);
-		WinUSBX_Set(GetPipePolicy);
-		WinUSBX_Set(GetPowerPolicy);
-		WinUSBX_Set(Initialize);
-		WinUSBX_Set(QueryDeviceInformation);
-		WinUSBX_Set(QueryInterfaceSettings);
-		WinUSBX_Set(QueryPipe);
-		WinUSBX_Set(ReadPipe);
-		WinUSBX_Set(ResetPipe);
-		WinUSBX_Set(SetCurrentAlternateSetting);
-		WinUSBX_Set(SetPipePolicy);
-		WinUSBX_Set(SetPowerPolicy);
-		WinUSBX_Set(WritePipe);
-		if (!native_winusb) {
-			WinUSBX_Set(ResetDevice);
-		}
-		if (WinUSBX[i].Initialize != NULL) {
-			WinUSBX[i].initialized = true;
-			usbi_dbg("initalized sub API %s", sub_api_name[i]);
-		} else {
-			usbi_warn(ctx, "Failed to initalize sub API %s", sub_api_name[i]);
-			WinUSBX[i].initialized = false;
-		}
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_exit(int sub_api)
-{
-	return LIBUSB_SUCCESS;
-}
-
-// NB: open and close must ensure that they only handle interface of
-// the right API type, as these functions can be called wholesale from
-// composite_open(), with interfaces belonging to different APIs
-static int winusbx_open(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-
-	HANDLE file_handle;
-	int i;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	// WinUSB requires a seperate handle for each interface
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
-		if ( (priv->usb_interface[i].path != NULL)
-		  && (priv->usb_interface[i].apib->id == USB_API_WINUSBX) ) {
-			file_handle = CreateFileA(priv->usb_interface[i].path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ,
-				NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
-			if (file_handle == INVALID_HANDLE_VALUE) {
-				usbi_err(ctx, "could not open device %s (interface %d): %s", priv->usb_interface[i].path, i, windows_error_str(0));
-				switch(GetLastError()) {
-				case ERROR_FILE_NOT_FOUND:	// The device was disconnected
-					return LIBUSB_ERROR_NO_DEVICE;
-				case ERROR_ACCESS_DENIED:
-					return LIBUSB_ERROR_ACCESS;
-				default:
-					return LIBUSB_ERROR_IO;
-				}
-			}
-			handle_priv->interface_handle[i].dev_handle = file_handle;
-		}
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-static void winusbx_close(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	HANDLE file_handle;
-	int i;
-
-	if (sub_api == SUB_API_NOTSET)
-		sub_api = priv->sub_api;
-	if (!WinUSBX[sub_api].initialized)
-		return;
-
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
-		if (priv->usb_interface[i].apib->id == USB_API_WINUSBX) {
-			file_handle = handle_priv->interface_handle[i].dev_handle;
-			if ( (file_handle != 0) && (file_handle != INVALID_HANDLE_VALUE)) {
-				CloseHandle(file_handle);
-			}
-		}
-	}
-}
-
-static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	HANDLE winusb_handle = handle_priv->interface_handle[iface].api_handle;
-	UCHAR policy;
-	ULONG timeout = 0;
-	uint8_t endpoint_address;
-	int i;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	// With handle and enpoints set (in parent), we can setup the default pipe properties
-	// see http://download.microsoft.com/download/D/1/D/D1DD7745-426B-4CC3-A269-ABBBE427C0EF/DVC-T705_DDC08.pptx
-	for (i=-1; i<priv->usb_interface[iface].nb_endpoints; i++) {
-		endpoint_address =(i==-1)?0:priv->usb_interface[iface].endpoint[i];
-		if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
-			PIPE_TRANSFER_TIMEOUT, sizeof(ULONG), &timeout)) {
-			usbi_dbg("failed to set PIPE_TRANSFER_TIMEOUT for control endpoint %02X", endpoint_address);
-		}
-		if ((i == -1) || (sub_api == SUB_API_LIBUSB0)) {
-			continue;	// Other policies don't apply to control endpoint or libusb0
-		}
-		policy = false;
-		if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
-			SHORT_PACKET_TERMINATE, sizeof(UCHAR), &policy)) {
-			usbi_dbg("failed to disable SHORT_PACKET_TERMINATE for endpoint %02X", endpoint_address);
-		}
-		if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
-			IGNORE_SHORT_PACKETS, sizeof(UCHAR), &policy)) {
-			usbi_dbg("failed to disable IGNORE_SHORT_PACKETS for endpoint %02X", endpoint_address);
-		}
-		policy = true;
-		/* ALLOW_PARTIAL_READS must be enabled due to likely libusbK bug. See:
-		   https://sourceforge.net/mailarchive/message.php?msg_id=29736015 */
-		if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
-			ALLOW_PARTIAL_READS, sizeof(UCHAR), &policy)) {
-			usbi_dbg("failed to enable ALLOW_PARTIAL_READS for endpoint %02X", endpoint_address);
-		}
-		if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
-			AUTO_CLEAR_STALL, sizeof(UCHAR), &policy)) {
-			usbi_dbg("failed to enable AUTO_CLEAR_STALL for endpoint %02X", endpoint_address);
-		}
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	bool is_using_usbccgp = (priv->apib->id == USB_API_COMPOSITE);
-	HANDLE file_handle, winusb_handle;
-	DWORD err;
-	int i;
-	SP_DEVICE_INTERFACE_DETAIL_DATA_A *dev_interface_details = NULL;
-	HDEVINFO dev_info = INVALID_HANDLE_VALUE;
-	SP_DEVINFO_DATA dev_info_data;
-	char* dev_path_no_guid = NULL;
-	char filter_path[] = "\\\\.\\libusb0-0000";
-	bool found_filter = false;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	// If the device is composite, but using the default Windows composite parent driver (usbccgp)
-	// or if it's the first WinUSB-like interface, we get a handle through Initialize().
-	if ((is_using_usbccgp) || (iface == 0)) {
-		// composite device (independent interfaces) or interface 0
-		file_handle = handle_priv->interface_handle[iface].dev_handle;
-		if ((file_handle == 0) || (file_handle == INVALID_HANDLE_VALUE)) {
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-
-		if (!WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) {
-			handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE;
-			err = GetLastError();
-			switch(err) {
-			case ERROR_BAD_COMMAND:
-				// The device was disconnected
-				usbi_err(ctx, "could not access interface %d: %s", iface, windows_error_str(0));
-				return LIBUSB_ERROR_NO_DEVICE;
-			default:
-				// it may be that we're using the libusb0 filter driver.
-				// TODO: can we move this whole business into the K/0 DLL?
-				for (i = 0; ; i++) {
-					safe_free(dev_interface_details);
-					safe_free(dev_path_no_guid);
-					dev_interface_details = get_interface_details_filter(ctx, &dev_info, &dev_info_data, &GUID_DEVINTERFACE_LIBUSB0_FILTER, i, filter_path);
-					if ((found_filter) || (dev_interface_details == NULL)) {
-						break;
-					}
-					// ignore GUID part
-					dev_path_no_guid = sanitize_path(strtok(dev_interface_details->DevicePath, "{"));
-					if (safe_strncmp(dev_path_no_guid, priv->usb_interface[iface].path, safe_strlen(dev_path_no_guid)) == 0) {
-						file_handle = CreateFileA(filter_path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ,
-							NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
-						if (file_handle == INVALID_HANDLE_VALUE) {
-							usbi_err(ctx, "could not open device %s: %s", filter_path, windows_error_str(0));
-						} else {
-							WinUSBX[sub_api].Free(winusb_handle);
-							if (!WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) {
-								continue;
-							}
-							found_filter = true;
-							break;
-						}
-					}
-				}
-				if (!found_filter) {
-					usbi_err(ctx, "could not access interface %d: %s", iface, windows_error_str(err));
-					return LIBUSB_ERROR_ACCESS;
-				}
-			}
-		}
-		handle_priv->interface_handle[iface].api_handle = winusb_handle;
-	} else {
-		// For all other interfaces, use GetAssociatedInterface()
-		winusb_handle = handle_priv->interface_handle[0].api_handle;
-		// It is a requirement for multiple interface devices on Windows that, to you
-		// must first claim the first interface before you claim the others
-		if ((winusb_handle == 0) || (winusb_handle == INVALID_HANDLE_VALUE)) {
-			file_handle = handle_priv->interface_handle[0].dev_handle;
-			if (WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) {
-				handle_priv->interface_handle[0].api_handle = winusb_handle;
-				usbi_warn(ctx, "auto-claimed interface 0 (required to claim %d with WinUSB)", iface);
-			} else {
-				usbi_warn(ctx, "failed to auto-claim interface 0 (required to claim %d with WinUSB): %s", iface, windows_error_str(0));
-				return LIBUSB_ERROR_ACCESS;
-			}
-		}
-		if (!WinUSBX[sub_api].GetAssociatedInterface(winusb_handle, (UCHAR)(iface-1),
-			&handle_priv->interface_handle[iface].api_handle)) {
-			handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE;
-			switch(GetLastError()) {
-			case ERROR_NO_MORE_ITEMS:   // invalid iface
-				return LIBUSB_ERROR_NOT_FOUND;
-			case ERROR_BAD_COMMAND:     // The device was disconnected
-				return LIBUSB_ERROR_NO_DEVICE;
-			case ERROR_ALREADY_EXISTS:  // already claimed
-				return LIBUSB_ERROR_BUSY;
-			default:
-				usbi_err(ctx, "could not claim interface %d: %s", iface, windows_error_str(0));
-				return LIBUSB_ERROR_ACCESS;
-			}
-		}
-	}
-	usbi_dbg("claimed interface %d", iface);
-	handle_priv->active_interface = iface;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	HANDLE winusb_handle;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	winusb_handle = handle_priv->interface_handle[iface].api_handle;
-	if ((winusb_handle == 0) || (winusb_handle == INVALID_HANDLE_VALUE)) {
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	WinUSBX[sub_api].Free(winusb_handle);
-	handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE;
-
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * Return the first valid interface (of the same API type), for control transfers
- */
-static int get_valid_interface(struct libusb_device_handle *dev_handle, int api_id)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	int i;
-
-	if ((api_id < USB_API_WINUSBX) || (api_id > USB_API_HID)) {
-		usbi_dbg("unsupported API ID");
-		return -1;
-	}
-
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		if ( (handle_priv->interface_handle[i].dev_handle != 0)
-		  && (handle_priv->interface_handle[i].dev_handle != INVALID_HANDLE_VALUE)
-		  && (handle_priv->interface_handle[i].api_handle != 0)
-		  && (handle_priv->interface_handle[i].api_handle != INVALID_HANDLE_VALUE)
-		  && (priv->usb_interface[i].apib->id == api_id) ) {
-			return i;
-		}
-	}
-	return -1;
-}
-
-/*
- * Lookup interface by endpoint address. -1 if not found
- */
-static int interface_by_endpoint(struct windows_device_priv *priv,
-	struct windows_device_handle_priv *handle_priv, uint8_t endpoint_address)
-{
-	int i, j;
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		if (handle_priv->interface_handle[i].api_handle == INVALID_HANDLE_VALUE)
-			continue;
-		if (handle_priv->interface_handle[i].api_handle == 0)
-			continue;
-		if (priv->usb_interface[i].endpoint == NULL)
-			continue;
-		for (j=0; j<priv->usb_interface[i].nb_endpoints; j++) {
-			if (priv->usb_interface[i].endpoint[j] == endpoint_address) {
-				return i;
-			}
-		}
-	}
-	return -1;
-}
-
-static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(
-		transfer->dev_handle);
-	WINUSB_SETUP_PACKET *setup = (WINUSB_SETUP_PACKET *) transfer->buffer;
-	ULONG size;
-	HANDLE winusb_handle;
-	int current_interface;
-	struct winfd wfd;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	transfer_priv->pollable_fd = INVALID_WINFD;
-	size = transfer->length - LIBUSB_CONTROL_SETUP_SIZE;
-
-	if (size > MAX_CTRL_BUFFER_LENGTH)
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	current_interface = get_valid_interface(transfer->dev_handle, USB_API_WINUSBX);
-	if (current_interface < 0) {
-		if (auto_claim(transfer, &current_interface, USB_API_WINUSBX) != LIBUSB_SUCCESS) {
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-	}
-
-	usbi_dbg("will use interface %d", current_interface);
-	winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
-
-	wfd = usbi_create_fd(winusb_handle, RW_READ, NULL, NULL);
-	// Always use the handle returned from usbi_create_fd (wfd.handle)
-	if (wfd.fd < 0) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	// Sending of set configuration control requests from WinUSB creates issues
-	if ( ((setup->request_type & (0x03 << 5)) == LIBUSB_REQUEST_TYPE_STANDARD)
-	  && (setup->request == LIBUSB_REQUEST_SET_CONFIGURATION) ) {
-		if (setup->value != priv->active_config) {
-			usbi_warn(ctx, "cannot set configuration other than the default one");
-			usbi_free_fd(&wfd);
-			return LIBUSB_ERROR_INVALID_PARAM;
-		}
-		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
-		wfd.overlapped->InternalHigh = 0;
-	} else {
-		if (!WinUSBX[sub_api].ControlTransfer(wfd.handle, *setup, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, size, NULL, wfd.overlapped)) {
-			if(GetLastError() != ERROR_IO_PENDING) {
-				usbi_warn(ctx, "ControlTransfer failed: %s", windows_error_str(0));
-				usbi_free_fd(&wfd);
-				return LIBUSB_ERROR_IO;
-			}
-		} else {
-			wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
-			wfd.overlapped->InternalHigh = (DWORD)size;
-		}
-	}
-
-	// Use priv_transfer to store data needed for async polling
-	transfer_priv->pollable_fd = wfd;
-	transfer_priv->interface_number = (uint8_t)current_interface;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	HANDLE winusb_handle;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	if (altsetting > 255) {
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	winusb_handle = handle_priv->interface_handle[iface].api_handle;
-	if ((winusb_handle == 0) || (winusb_handle == INVALID_HANDLE_VALUE)) {
-		usbi_err(ctx, "interface must be claimed first");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	if (!WinUSBX[sub_api].SetCurrentAlternateSetting(winusb_handle, (UCHAR)altsetting)) {
-		usbi_err(ctx, "SetCurrentAlternateSetting failed: %s", windows_error_str(0));
-		return LIBUSB_ERROR_IO;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	HANDLE winusb_handle;
-	bool ret;
-	int current_interface;
-	struct winfd wfd;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	transfer_priv->pollable_fd = INVALID_WINFD;
-
-	current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface);
-
-	winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
-
-	wfd = usbi_create_fd(winusb_handle, IS_XFERIN(transfer) ? RW_READ : RW_WRITE, NULL, NULL);
-	// Always use the handle returned from usbi_create_fd (wfd.handle)
-	if (wfd.fd < 0) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	if (IS_XFERIN(transfer)) {
-		usbi_dbg("reading %d bytes", transfer->length);
-		ret = WinUSBX[sub_api].ReadPipe(wfd.handle, transfer->endpoint, transfer->buffer, transfer->length, NULL, wfd.overlapped);
-	} else {
-		usbi_dbg("writing %d bytes", transfer->length);
-		ret = WinUSBX[sub_api].WritePipe(wfd.handle, transfer->endpoint, transfer->buffer, transfer->length, NULL, wfd.overlapped);
-	}
-	if (!ret) {
-		if(GetLastError() != ERROR_IO_PENDING) {
-			usbi_err(ctx, "ReadPipe/WritePipe failed: %s", windows_error_str(0));
-			usbi_free_fd(&wfd);
-			return LIBUSB_ERROR_IO;
-		}
-	} else {
-		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
-		wfd.overlapped->InternalHigh = (DWORD)transfer->length;
-	}
-
-	transfer_priv->pollable_fd = wfd;
-	transfer_priv->interface_number = (uint8_t)current_interface;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	HANDLE winusb_handle;
-	int current_interface;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	current_interface = interface_by_endpoint(priv, handle_priv, endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cannot clear");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	usbi_dbg("matched endpoint %02X with interface %d", endpoint, current_interface);
-	winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
-
-	if (!WinUSBX[sub_api].ResetPipe(winusb_handle, endpoint)) {
-		usbi_err(ctx, "ResetPipe failed: %s", windows_error_str(0));
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * from http://www.winvistatips.com/winusb-bugchecks-t335323.html (confirmed
- * through testing as well):
- * "You can not call WinUsb_AbortPipe on control pipe. You can possibly cancel
- * the control transfer using CancelIo"
- */
-static int winusbx_abort_control(int sub_api, struct usbi_transfer *itransfer)
-{
-	// Cancelling of the I/O is done in the parent
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_abort_transfers(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	HANDLE winusb_handle;
-	int current_interface;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	current_interface = transfer_priv->interface_number;
-	if ((current_interface < 0) || (current_interface >= USB_MAXINTERFACES)) {
-		usbi_err(ctx, "program assertion failed: invalid interface_number");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-	usbi_dbg("will use interface %d", current_interface);
-
-	winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
-
-	if (!WinUSBX[sub_api].AbortPipe(winusb_handle, transfer->endpoint)) {
-		usbi_err(ctx, "AbortPipe failed: %s", windows_error_str(0));
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-/*
- * from the "How to Use WinUSB to Communicate with a USB Device" Microsoft white paper
- * (http://www.microsoft.com/whdc/connect/usb/winusb_howto.mspx):
- * "WinUSB does not support host-initiated reset port and cycle port operations" and
- * IOCTL_INTERNAL_USB_CYCLE_PORT is only available in kernel mode and the
- * IOCTL_USB_HUB_CYCLE_PORT ioctl was removed from Vista => the best we can do is
- * cycle the pipes (and even then, the control pipe can not be reset using WinUSB)
- */
-// TODO: (post hotplug): see if we can force eject the device and redetect it (reuse hotplug?)
-static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	struct winfd wfd;
-	HANDLE winusb_handle;
-	int i, j;
-
-	CHECK_WINUSBX_AVAILABLE(sub_api);
-
-	// Reset any available pipe (except control)
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		winusb_handle = handle_priv->interface_handle[i].api_handle;
-		for (wfd = handle_to_winfd(winusb_handle); wfd.fd > 0;)
-		{
-			// Cancel any pollable I/O
-			usbi_remove_pollfd(ctx, wfd.fd);
-			usbi_free_fd(&wfd);
-			wfd = handle_to_winfd(winusb_handle);
-		}
-
-		if ( (winusb_handle != 0) && (winusb_handle != INVALID_HANDLE_VALUE)) {
-			for (j=0; j<priv->usb_interface[i].nb_endpoints; j++) {
-				usbi_dbg("resetting ep %02X", priv->usb_interface[i].endpoint[j]);
-				if (!WinUSBX[sub_api].AbortPipe(winusb_handle, priv->usb_interface[i].endpoint[j])) {
-					usbi_err(ctx, "AbortPipe (pipe address %02X) failed: %s",
-						priv->usb_interface[i].endpoint[j], windows_error_str(0));
-				}
-				// FlushPipe seems to fail on OUT pipes
-				if (IS_EPIN(priv->usb_interface[i].endpoint[j])
-				  && (!WinUSBX[sub_api].FlushPipe(winusb_handle, priv->usb_interface[i].endpoint[j])) ) {
-					usbi_err(ctx, "FlushPipe (pipe address %02X) failed: %s",
-						priv->usb_interface[i].endpoint[j], windows_error_str(0));
-				}
-				if (!WinUSBX[sub_api].ResetPipe(winusb_handle, priv->usb_interface[i].endpoint[j])) {
-					usbi_err(ctx, "ResetPipe (pipe address %02X) failed: %s",
-						priv->usb_interface[i].endpoint[j], windows_error_str(0));
-				}
-			}
-		}
-	}
-
-	// libusbK & libusb0 have the ability to issue an actual device reset
-	if (WinUSBX[sub_api].ResetDevice != NULL) {
-		winusb_handle = handle_priv->interface_handle[0].api_handle;
-		if ( (winusb_handle != 0) && (winusb_handle != INVALID_HANDLE_VALUE)) {
-			WinUSBX[sub_api].ResetDevice(winusb_handle);
-		}
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size)
-{
-	itransfer->transferred += io_size;
-	return LIBUSB_TRANSFER_COMPLETED;
-}
-
-/*
- * Internal HID Support functions (from libusb-win32)
- * Note that functions that complete data transfer synchronously must return
- * LIBUSB_COMPLETED instead of LIBUSB_SUCCESS
- */
-static int _hid_get_hid_descriptor(struct hid_device_priv* dev, void *data, size_t *size);
-static int _hid_get_report_descriptor(struct hid_device_priv* dev, void *data, size_t *size);
-
-static int _hid_wcslen(WCHAR *str)
-{
-	int i = 0;
-	while (str[i] && (str[i] != 0x409)) {
-		i++;
-	}
-	return i;
-}
-
-static int _hid_get_device_descriptor(struct hid_device_priv* dev, void *data, size_t *size)
-{
-	struct libusb_device_descriptor d;
-
-	d.bLength = LIBUSB_DT_DEVICE_SIZE;
-	d.bDescriptorType = LIBUSB_DT_DEVICE;
-	d.bcdUSB = 0x0200; /* 2.00 */
-	d.bDeviceClass = 0;
-	d.bDeviceSubClass = 0;
-	d.bDeviceProtocol = 0;
-	d.bMaxPacketSize0 = 64; /* fix this! */
-	d.idVendor = (uint16_t)dev->vid;
-	d.idProduct = (uint16_t)dev->pid;
-	d.bcdDevice = 0x0100;
-	d.iManufacturer = dev->string_index[0];
-	d.iProduct = dev->string_index[1];
-	d.iSerialNumber = dev->string_index[2];
-	d.bNumConfigurations = 1;
-
-	if (*size > LIBUSB_DT_DEVICE_SIZE)
-		*size = LIBUSB_DT_DEVICE_SIZE;
-	memcpy(data, &d, *size);
-	return LIBUSB_COMPLETED;
-}
-
-static int _hid_get_config_descriptor(struct hid_device_priv* dev, void *data, size_t *size)
-{
-	char num_endpoints = 0;
-	size_t config_total_len = 0;
-	char tmp[HID_MAX_CONFIG_DESC_SIZE];
-	struct libusb_config_descriptor *cd;
-	struct libusb_interface_descriptor *id;
-	struct libusb_hid_descriptor *hd;
-	struct libusb_endpoint_descriptor *ed;
-	size_t tmp_size;
-
-	if (dev->input_report_size)
-		num_endpoints++;
-	if (dev->output_report_size)
-		num_endpoints++;
-
-	config_total_len = LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE
-		+ LIBUSB_DT_HID_SIZE + num_endpoints * LIBUSB_DT_ENDPOINT_SIZE;
-
-
-	cd = (struct libusb_config_descriptor *)tmp;
-	id = (struct libusb_interface_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE);
-	hd = (struct libusb_hid_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE
-		+ LIBUSB_DT_INTERFACE_SIZE);
-	ed = (struct libusb_endpoint_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE
-		+ LIBUSB_DT_INTERFACE_SIZE
-		+ LIBUSB_DT_HID_SIZE);
-
-	cd->bLength = LIBUSB_DT_CONFIG_SIZE;
-	cd->bDescriptorType = LIBUSB_DT_CONFIG;
-	cd->wTotalLength = (uint16_t) config_total_len;
-	cd->bNumInterfaces = 1;
-	cd->bConfigurationValue = 1;
-	cd->iConfiguration = 0;
-	cd->bmAttributes = 1 << 7; /* bus powered */
-	cd->MaxPower = 50;
-
-	id->bLength = LIBUSB_DT_INTERFACE_SIZE;
-	id->bDescriptorType = LIBUSB_DT_INTERFACE;
-	id->bInterfaceNumber = 0;
-	id->bAlternateSetting = 0;
-	id->bNumEndpoints = num_endpoints;
-	id->bInterfaceClass = 3;
-	id->bInterfaceSubClass = 0;
-	id->bInterfaceProtocol = 0;
-	id->iInterface = 0;
-
-	tmp_size = LIBUSB_DT_HID_SIZE;
-	_hid_get_hid_descriptor(dev, hd, &tmp_size);
-
-	if (dev->input_report_size) {
-		ed->bLength = LIBUSB_DT_ENDPOINT_SIZE;
-		ed->bDescriptorType = LIBUSB_DT_ENDPOINT;
-		ed->bEndpointAddress = HID_IN_EP;
-		ed->bmAttributes = 3;
-		ed->wMaxPacketSize = dev->input_report_size - 1;
-		ed->bInterval = 10;
-		ed = (struct libusb_endpoint_descriptor *)((char*)ed + LIBUSB_DT_ENDPOINT_SIZE);
-	}
-
-	if (dev->output_report_size) {
-		ed->bLength = LIBUSB_DT_ENDPOINT_SIZE;
-		ed->bDescriptorType = LIBUSB_DT_ENDPOINT;
-		ed->bEndpointAddress = HID_OUT_EP;
-		ed->bmAttributes = 3;
-		ed->wMaxPacketSize = dev->output_report_size - 1;
-		ed->bInterval = 10;
-	}
-
-	if (*size > config_total_len)
-		*size = config_total_len;
-	memcpy(data, tmp, *size);
-	return LIBUSB_COMPLETED;
-}
-
-static int _hid_get_string_descriptor(struct hid_device_priv* dev, int _index,
-									  void *data, size_t *size)
-{
-	void *tmp = NULL;
-	size_t tmp_size = 0;
-	int i;
-
-	/* language ID, EN-US */
-	char string_langid[] = {
-		0x09,
-		0x04
-	};
-
-	if ((*size < 2) || (*size > 255)) {
-		return LIBUSB_ERROR_OVERFLOW;
-	}
-
-	if (_index == 0) {
-		tmp = string_langid;
-		tmp_size = sizeof(string_langid)+2;
-	} else {
-		for (i=0; i<3; i++) {
-			if (_index == (dev->string_index[i])) {
-				tmp = dev->string[i];
-				tmp_size = (_hid_wcslen(dev->string[i])+1) * sizeof(WCHAR);
-				break;
-			}
-		}
-		if (i == 3) {	// not found
-			return LIBUSB_ERROR_INVALID_PARAM;
-		}
-	}
-
-	if(!tmp_size) {
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	if (tmp_size < *size) {
-		*size = tmp_size;
-	}
-	// 2 byte header
-	((uint8_t*)data)[0] = (uint8_t)*size;
-	((uint8_t*)data)[1] = LIBUSB_DT_STRING;
-	memcpy((uint8_t*)data+2, tmp, *size-2);
-	return LIBUSB_COMPLETED;
-}
-
-static int _hid_get_hid_descriptor(struct hid_device_priv* dev, void *data, size_t *size)
-{
-	struct libusb_hid_descriptor d;
-	uint8_t tmp[MAX_HID_DESCRIPTOR_SIZE];
-	size_t report_len = MAX_HID_DESCRIPTOR_SIZE;
-
-	_hid_get_report_descriptor(dev, tmp, &report_len);
-
-	d.bLength = LIBUSB_DT_HID_SIZE;
-	d.bDescriptorType = LIBUSB_DT_HID;
-	d.bcdHID = 0x0110; /* 1.10 */
-	d.bCountryCode = 0;
-	d.bNumDescriptors = 1;
-	d.bClassDescriptorType = LIBUSB_DT_REPORT;
-	d.wClassDescriptorLength = (uint16_t)report_len;
-
-	if (*size > LIBUSB_DT_HID_SIZE)
-		*size = LIBUSB_DT_HID_SIZE;
-	memcpy(data, &d, *size);
-	return LIBUSB_COMPLETED;
-}
-
-static int _hid_get_report_descriptor(struct hid_device_priv* dev, void *data, size_t *size)
-{
-	uint8_t d[MAX_HID_DESCRIPTOR_SIZE];
-	size_t i = 0;
-
-	/* usage page (0xFFA0 == vendor defined) */
-	d[i++] = 0x06; d[i++] = 0xA0; d[i++] = 0xFF;
-	/* usage (vendor defined) */
-	d[i++] = 0x09; d[i++] = 0x01;
-	/* start collection (application) */
-	d[i++] = 0xA1; d[i++] = 0x01;
-	/* input report */
-	if (dev->input_report_size) {
-		/* usage (vendor defined) */
-		d[i++] = 0x09; d[i++] = 0x01;
-		/* logical minimum (0) */
-		d[i++] = 0x15; d[i++] = 0x00;
-		/* logical maximum (255) */
-		d[i++] = 0x25; d[i++] = 0xFF;
-		/* report size (8 bits) */
-		d[i++] = 0x75; d[i++] = 0x08;
-		/* report count */
-		d[i++] = 0x95; d[i++] = (uint8_t)dev->input_report_size - 1;
-		/* input (data, variable, absolute) */
-		d[i++] = 0x81; d[i++] = 0x00;
-	}
-	/* output report */
-	if (dev->output_report_size) {
-		/* usage (vendor defined) */
-		d[i++] = 0x09; d[i++] = 0x02;
-		/* logical minimum (0) */
-		d[i++] = 0x15; d[i++] = 0x00;
-		/* logical maximum (255) */
-		d[i++] = 0x25; d[i++] = 0xFF;
-		/* report size (8 bits) */
-		d[i++] = 0x75; d[i++] = 0x08;
-		/* report count */
-		d[i++] = 0x95; d[i++] = (uint8_t)dev->output_report_size - 1;
-		/* output (data, variable, absolute) */
-		d[i++] = 0x91; d[i++] = 0x00;
-	}
-	/* feature report */
-	if (dev->feature_report_size) {
-		/* usage (vendor defined) */
-		d[i++] = 0x09; d[i++] = 0x03;
-		/* logical minimum (0) */
-		d[i++] = 0x15; d[i++] = 0x00;
-		/* logical maximum (255) */
-		d[i++] = 0x25; d[i++] = 0xFF;
-		/* report size (8 bits) */
-		d[i++] = 0x75; d[i++] = 0x08;
-		/* report count */
-		d[i++] = 0x95; d[i++] = (uint8_t)dev->feature_report_size - 1;
-		/* feature (data, variable, absolute) */
-		d[i++] = 0xb2; d[i++] = 0x02; d[i++] = 0x01;
-	}
-
-	/* end collection */
-	d[i++] = 0xC0;
-
-	if (*size > i)
-		*size = i;
-	memcpy(data, d, *size);
-	return LIBUSB_COMPLETED;
-}
-
-static int _hid_get_descriptor(struct hid_device_priv* dev, HANDLE hid_handle, int recipient,
-							   int type, int _index, void *data, size_t *size)
-{
-	switch(type) {
-	case LIBUSB_DT_DEVICE:
-		usbi_dbg("LIBUSB_DT_DEVICE");
-		return _hid_get_device_descriptor(dev, data, size);
-	case LIBUSB_DT_CONFIG:
-		usbi_dbg("LIBUSB_DT_CONFIG");
-		if (!_index)
-			return _hid_get_config_descriptor(dev, data, size);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	case LIBUSB_DT_STRING:
-		usbi_dbg("LIBUSB_DT_STRING");
-		return _hid_get_string_descriptor(dev, _index, data, size);
-	case LIBUSB_DT_HID:
-		usbi_dbg("LIBUSB_DT_HID");
-		if (!_index)
-			return _hid_get_hid_descriptor(dev, data, size);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	case LIBUSB_DT_REPORT:
-		usbi_dbg("LIBUSB_DT_REPORT");
-		if (!_index)
-			return _hid_get_report_descriptor(dev, data, size);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	case LIBUSB_DT_PHYSICAL:
-		usbi_dbg("LIBUSB_DT_PHYSICAL");
-		if (HidD_GetPhysicalDescriptor(hid_handle, data, (ULONG)*size))
-			return LIBUSB_COMPLETED;
-		return LIBUSB_ERROR_OTHER;
-	}
-	usbi_dbg("unsupported");
-	return LIBUSB_ERROR_INVALID_PARAM;
-}
-
-static int _hid_get_report(struct hid_device_priv* dev, HANDLE hid_handle, int id, void *data,
-						   struct windows_transfer_priv *tp, size_t *size, OVERLAPPED* overlapped,
-						   int report_type)
-{
-	uint8_t *buf;
-	DWORD ioctl_code, read_size, expected_size = (DWORD)*size;
-	int r = LIBUSB_SUCCESS;
-
-	if (tp->hid_buffer != NULL) {
-		usbi_dbg("program assertion failed: hid_buffer is not NULL");
-	}
-
-	if ((*size == 0) || (*size > MAX_HID_REPORT_SIZE)) {
-		usbi_dbg("invalid size (%d)", *size);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	switch (report_type) {
-		case HID_REPORT_TYPE_INPUT:
-			ioctl_code = IOCTL_HID_GET_INPUT_REPORT;
-			break;
-		case HID_REPORT_TYPE_FEATURE:
-			ioctl_code = IOCTL_HID_GET_FEATURE;
-			break;
-		default:
-			usbi_dbg("unknown HID report type %d", report_type);
-			return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	// Add a trailing byte to detect overflows
-	buf = (uint8_t*)calloc(expected_size+1, 1);
-	if (buf == NULL) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-	buf[0] = (uint8_t)id;	// Must be set always
-	usbi_dbg("report ID: 0x%02X", buf[0]);
-
-	tp->hid_expected_size = expected_size;
-	read_size = expected_size;
-
-	// NB: The size returned by DeviceIoControl doesn't include report IDs when not in use (0)
-	if (!DeviceIoControl(hid_handle, ioctl_code, buf, expected_size+1,
-		buf, expected_size+1, &read_size, overlapped)) {
-		if (GetLastError() != ERROR_IO_PENDING) {
-			usbi_dbg("Failed to Read HID Report: %s", windows_error_str(0));
-			safe_free(buf);
-			return LIBUSB_ERROR_IO;
-		}
-		// Asynchronous wait
-		tp->hid_buffer = buf;
-		tp->hid_dest = (uint8_t*)data; // copy dest, as not necessarily the start of the transfer buffer
-		return LIBUSB_SUCCESS;
-	}
-
-	// Transfer completed synchronously => copy and discard extra buffer
-	if (read_size == 0) {
-		usbi_warn(NULL, "program assertion failed - read completed synchronously, but no data was read");
-		*size = 0;
-	} else {
-		if (buf[0] != id) {
-			usbi_warn(NULL, "mismatched report ID (data is %02X, parameter is %02X)", buf[0], id);
-		}
-		if ((size_t)read_size > expected_size) {
-			r = LIBUSB_ERROR_OVERFLOW;
-			usbi_dbg("OVERFLOW!");
-		} else {
-			r = LIBUSB_COMPLETED;
-		}
-
-		*size = MIN((size_t)read_size, *size);
-		if (id == 0) {
-			// Discard report ID
-			memcpy(data, buf+1, *size);
-		} else {
-			memcpy(data, buf, *size);
-		}
-	}
-	safe_free(buf);
-	return r;
-}
-
-static int _hid_set_report(struct hid_device_priv* dev, HANDLE hid_handle, int id, void *data,
-						   struct windows_transfer_priv *tp, size_t *size, OVERLAPPED* overlapped,
-						   int report_type)
-{
-	uint8_t *buf = NULL;
-	DWORD ioctl_code, write_size= (DWORD)*size;
-
-	if (tp->hid_buffer != NULL) {
-		usbi_dbg("program assertion failed: hid_buffer is not NULL");
-	}
-
-	if ((*size == 0) || (*size > MAX_HID_REPORT_SIZE)) {
-		usbi_dbg("invalid size (%d)", *size);
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	switch (report_type) {
-		case HID_REPORT_TYPE_OUTPUT:
-			ioctl_code = IOCTL_HID_SET_OUTPUT_REPORT;
-			break;
-		case HID_REPORT_TYPE_FEATURE:
-			ioctl_code = IOCTL_HID_SET_FEATURE;
-			break;
-		default:
-			usbi_dbg("unknown HID report type %d", report_type);
-			return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	usbi_dbg("report ID: 0x%02X", id);
-	// When report IDs are not used (i.e. when id == 0), we must add
-	// a null report ID. Otherwise, we just use original data buffer
-	if (id == 0) {
-		write_size++;
-	}
-	buf = (uint8_t*) malloc(write_size);
-	if (buf == NULL) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-	if (id == 0) {
-		buf[0] = 0;
-		memcpy(buf + 1, data, *size);
-	} else {
-		// This seems like a waste, but if we don't duplicate the
-		// data, we'll get issues when freeing hid_buffer
-		memcpy(buf, data, *size);
-		if (buf[0] != id) {
-			usbi_warn(NULL, "mismatched report ID (data is %02X, parameter is %02X)", buf[0], id);
-		}
-	}
-
-	// NB: The size returned by DeviceIoControl doesn't include report IDs when not in use (0)
-	if (!DeviceIoControl(hid_handle, ioctl_code, buf, write_size,
-		buf, write_size, &write_size, overlapped)) {
-		if (GetLastError() != ERROR_IO_PENDING) {
-			usbi_dbg("Failed to Write HID Output Report: %s", windows_error_str(0));
-			safe_free(buf);
-			return LIBUSB_ERROR_IO;
-		}
-		tp->hid_buffer = buf;
-		tp->hid_dest = NULL;
-		return LIBUSB_SUCCESS;
-	}
-
-	// Transfer completed synchronously
-	*size = write_size;
-	if (write_size == 0) {
-		usbi_dbg("program assertion failed - write completed synchronously, but no data was written");
-	}
-	safe_free(buf);
-	return LIBUSB_COMPLETED;
-}
-
-static int _hid_class_request(struct hid_device_priv* dev, HANDLE hid_handle, int request_type,
-							  int request, int value, int _index, void *data, struct windows_transfer_priv *tp,
-							  size_t *size, OVERLAPPED* overlapped)
-{
-	int report_type = (value >> 8) & 0xFF;
-	int report_id = value & 0xFF;
-
-	if ( (LIBUSB_REQ_RECIPIENT(request_type) != LIBUSB_RECIPIENT_INTERFACE)
-	  && (LIBUSB_REQ_RECIPIENT(request_type) != LIBUSB_RECIPIENT_DEVICE) )
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	if (LIBUSB_REQ_OUT(request_type) && request == HID_REQ_SET_REPORT)
-		return _hid_set_report(dev, hid_handle, report_id, data, tp, size, overlapped, report_type);
-
-	if (LIBUSB_REQ_IN(request_type) && request == HID_REQ_GET_REPORT)
-		return _hid_get_report(dev, hid_handle, report_id, data, tp, size, overlapped, report_type);
-
-	return LIBUSB_ERROR_INVALID_PARAM;
-}
-
-
-/*
- * HID API functions
- */
-static int hid_init(int sub_api, struct libusb_context *ctx)
-{
-	DLL_LOAD(hid.dll, HidD_GetAttributes, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetHidGuid, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetPreparsedData, TRUE);
-	DLL_LOAD(hid.dll, HidD_FreePreparsedData, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetManufacturerString, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetProductString, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetSerialNumberString, TRUE);
-	DLL_LOAD(hid.dll, HidP_GetCaps, TRUE);
-	DLL_LOAD(hid.dll, HidD_SetNumInputBuffers, TRUE);
-	DLL_LOAD(hid.dll, HidD_SetFeature, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetFeature, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetPhysicalDescriptor, TRUE);
-	DLL_LOAD(hid.dll, HidD_GetInputReport, FALSE);
-	DLL_LOAD(hid.dll, HidD_SetOutputReport, FALSE);
-	DLL_LOAD(hid.dll, HidD_FlushQueue, TRUE);
-	DLL_LOAD(hid.dll, HidP_GetValueCaps, TRUE);
-
-	api_hid_available = true;
-	return LIBUSB_SUCCESS;
-}
-
-static int hid_exit(int sub_api)
-{
-	return LIBUSB_SUCCESS;
-}
-
-// NB: open and close must ensure that they only handle interface of
-// the right API type, as these functions can be called wholesale from
-// composite_open(), with interfaces belonging to different APIs
-static int hid_open(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-
-	HIDD_ATTRIBUTES hid_attributes;
-	PHIDP_PREPARSED_DATA preparsed_data = NULL;
-	HIDP_CAPS capabilities;
-	HIDP_VALUE_CAPS *value_caps;
-
-	HANDLE hid_handle = INVALID_HANDLE_VALUE;
-	int i, j;
-	// report IDs handling
-	ULONG size[3];
-	const char* type[3] = {"input", "output", "feature"};
-	int nb_ids[2];	// zero and nonzero report IDs
-
-	CHECK_HID_AVAILABLE;
-	if (priv->hid == NULL) {
-		usbi_err(ctx, "program assertion failed - private HID structure is unitialized");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
-		if ( (priv->usb_interface[i].path != NULL)
-		  && (priv->usb_interface[i].apib->id == USB_API_HID) ) {
-			hid_handle = CreateFileA(priv->usb_interface[i].path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ,
-				NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
-			/*
-			 * http://www.lvr.com/hidfaq.htm: Why do I receive "Access denied" when attempting to access my HID?
-			 * "Windows 2000 and later have exclusive read/write access to HIDs that are configured as a system
-			 * keyboards or mice. An application can obtain a handle to a system keyboard or mouse by not
-			 * requesting READ or WRITE access with CreateFile. Applications can then use HidD_SetFeature and
-			 * HidD_GetFeature (if the device supports Feature reports)."
-			 */
-			if (hid_handle == INVALID_HANDLE_VALUE) {
-				usbi_warn(ctx, "could not open HID device in R/W mode (keyboard or mouse?) - trying without");
-				hid_handle = CreateFileA(priv->usb_interface[i].path, 0, FILE_SHARE_WRITE | FILE_SHARE_READ,
-					NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
-				if (hid_handle == INVALID_HANDLE_VALUE) {
-					usbi_err(ctx, "could not open device %s (interface %d): %s", priv->path, i, windows_error_str(0));
-					switch(GetLastError()) {
-					case ERROR_FILE_NOT_FOUND:	// The device was disconnected
-						return LIBUSB_ERROR_NO_DEVICE;
-					case ERROR_ACCESS_DENIED:
-						return LIBUSB_ERROR_ACCESS;
-					default:
-						return LIBUSB_ERROR_IO;
-					}
-				}
-				priv->usb_interface[i].restricted_functionality = true;
-			}
-			handle_priv->interface_handle[i].api_handle = hid_handle;
-		}
-	}
-
-	hid_attributes.Size = sizeof(hid_attributes);
-	do {
-		if (!HidD_GetAttributes(hid_handle, &hid_attributes)) {
-			usbi_err(ctx, "could not gain access to HID top collection (HidD_GetAttributes)");
-			break;
-		}
-
-		priv->hid->vid = hid_attributes.VendorID;
-		priv->hid->pid = hid_attributes.ProductID;
-
-		// Set the maximum available input buffer size
-		for (i=32; HidD_SetNumInputBuffers(hid_handle, i); i*=2);
-		usbi_dbg("set maximum input buffer size to %d", i/2);
-
-		// Get the maximum input and output report size
-		if (!HidD_GetPreparsedData(hid_handle, &preparsed_data) || !preparsed_data) {
-			usbi_err(ctx, "could not read HID preparsed data (HidD_GetPreparsedData)");
-			break;
-		}
-		if (HidP_GetCaps(preparsed_data, &capabilities) != HIDP_STATUS_SUCCESS) {
-			usbi_err(ctx, "could not parse HID capabilities (HidP_GetCaps)");
-			break;
-		}
-
-		// Find out if interrupt will need report IDs
-		size[0] = capabilities.NumberInputValueCaps;
-		size[1] = capabilities.NumberOutputValueCaps;
-		size[2] = capabilities.NumberFeatureValueCaps;
-		for (j=HidP_Input; j<=HidP_Feature; j++) {
-			usbi_dbg("%d HID %s report value(s) found", size[j], type[j]);
-			priv->hid->uses_report_ids[j] = false;
-			if (size[j] > 0) {
-				value_caps = (HIDP_VALUE_CAPS*) calloc(size[j], sizeof(HIDP_VALUE_CAPS));
-				if ( (value_caps != NULL)
-				  && (HidP_GetValueCaps((HIDP_REPORT_TYPE)j, value_caps, &size[j], preparsed_data) == HIDP_STATUS_SUCCESS)
-				  && (size[j] >= 1) ) {
-					nb_ids[0] = 0;
-					nb_ids[1] = 0;
-					for (i=0; i<(int)size[j]; i++) {
-						usbi_dbg("  Report ID: 0x%02X", value_caps[i].ReportID);
-						if (value_caps[i].ReportID != 0) {
-							nb_ids[1]++;
-						} else {
-							nb_ids[0]++;
-						}
-					}
-					if (nb_ids[1] != 0) {
-						if (nb_ids[0] != 0) {
-							usbi_warn(ctx, "program assertion failed: zero and nonzero report IDs used for %s",
-								type[j]);
-						}
-						priv->hid->uses_report_ids[j] = true;
-					}
-				} else {
-					usbi_warn(ctx, "  could not process %s report IDs", type[j]);
-				}
-				safe_free(value_caps);
-			}
-		}
-
-		// Set the report sizes
-		priv->hid->input_report_size = capabilities.InputReportByteLength;
-		priv->hid->output_report_size = capabilities.OutputReportByteLength;
-		priv->hid->feature_report_size = capabilities.FeatureReportByteLength;
-
-		// Fetch string descriptors
-		priv->hid->string_index[0] = priv->dev_descriptor.iManufacturer;
-		if (priv->hid->string_index[0] != 0) {
-			HidD_GetManufacturerString(hid_handle, priv->hid->string[0],
-				sizeof(priv->hid->string[0]));
-		} else {
-			priv->hid->string[0][0] = 0;
-		}
-		priv->hid->string_index[1] = priv->dev_descriptor.iProduct;
-		if (priv->hid->string_index[1] != 0) {
-			HidD_GetProductString(hid_handle, priv->hid->string[1],
-				sizeof(priv->hid->string[1]));
-		} else {
-			priv->hid->string[1][0] = 0;
-		}
-		priv->hid->string_index[2] = priv->dev_descriptor.iSerialNumber;
-		if (priv->hid->string_index[2] != 0) {
-			HidD_GetSerialNumberString(hid_handle, priv->hid->string[2],
-				sizeof(priv->hid->string[2]));
-		} else {
-			priv->hid->string[2][0] = 0;
-		}
-	} while(0);
-
-	if (preparsed_data) {
-		HidD_FreePreparsedData(preparsed_data);
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-static void hid_close(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	HANDLE file_handle;
-	int i;
-
-	if (!api_hid_available)
-		return;
-
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
-		if (priv->usb_interface[i].apib->id == USB_API_HID) {
-			file_handle = handle_priv->interface_handle[i].api_handle;
-			if ( (file_handle != 0) && (file_handle != INVALID_HANDLE_VALUE)) {
-				CloseHandle(file_handle);
-			}
-		}
-	}
-}
-
-static int hid_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	CHECK_HID_AVAILABLE;
-
-	// NB: Disconnection detection is not possible in this function
-	if (priv->usb_interface[iface].path == NULL) {
-		return LIBUSB_ERROR_NOT_FOUND;	// invalid iface
-	}
-
-	// We use dev_handle as a flag for interface claimed
-	if (handle_priv->interface_handle[iface].dev_handle == INTERFACE_CLAIMED) {
-		return LIBUSB_ERROR_BUSY;	// already claimed
-	}
-
-	handle_priv->interface_handle[iface].dev_handle = INTERFACE_CLAIMED;
-
-	usbi_dbg("claimed interface %d", iface);
-	handle_priv->active_interface = iface;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int hid_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-
-	CHECK_HID_AVAILABLE;
-
-	if (priv->usb_interface[iface].path == NULL) {
-		return LIBUSB_ERROR_NOT_FOUND;	// invalid iface
-	}
-
-	if (handle_priv->interface_handle[iface].dev_handle != INTERFACE_CLAIMED) {
-		return LIBUSB_ERROR_NOT_FOUND;	// invalid iface
-	}
-
-	handle_priv->interface_handle[iface].dev_handle = INVALID_HANDLE_VALUE;
-
-	return LIBUSB_SUCCESS;
-}
-
-static int hid_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-
-	CHECK_HID_AVAILABLE;
-
-	if (altsetting > 255) {
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	if (altsetting != 0) {
-		usbi_err(ctx, "set interface altsetting not supported for altsetting >0");
-		return LIBUSB_ERROR_NOT_SUPPORTED;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-static int hid_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	WINUSB_SETUP_PACKET *setup = (WINUSB_SETUP_PACKET *) transfer->buffer;
-	HANDLE hid_handle;
-	struct winfd wfd;
-	int current_interface, config;
-	size_t size;
-	int r = LIBUSB_ERROR_INVALID_PARAM;
-
-	CHECK_HID_AVAILABLE;
-
-	transfer_priv->pollable_fd = INVALID_WINFD;
-	safe_free(transfer_priv->hid_buffer);
-	transfer_priv->hid_dest = NULL;
-	size = transfer->length - LIBUSB_CONTROL_SETUP_SIZE;
-
-	if (size > MAX_CTRL_BUFFER_LENGTH) {
-		return LIBUSB_ERROR_INVALID_PARAM;
-	}
-
-	current_interface = get_valid_interface(transfer->dev_handle, USB_API_HID);
-	if (current_interface < 0) {
-		if (auto_claim(transfer, &current_interface, USB_API_HID) != LIBUSB_SUCCESS) {
-			return LIBUSB_ERROR_NOT_FOUND;
-		}
-	}
-
-	usbi_dbg("will use interface %d", current_interface);
-	hid_handle = handle_priv->interface_handle[current_interface].api_handle;
-	// Always use the handle returned from usbi_create_fd (wfd.handle)
-	wfd = usbi_create_fd(hid_handle, RW_READ, NULL, NULL);
-	if (wfd.fd < 0) {
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	switch(LIBUSB_REQ_TYPE(setup->request_type)) {
-	case LIBUSB_REQUEST_TYPE_STANDARD:
-		switch(setup->request) {
-		case LIBUSB_REQUEST_GET_DESCRIPTOR:
-			r = _hid_get_descriptor(priv->hid, wfd.handle, LIBUSB_REQ_RECIPIENT(setup->request_type),
-				(setup->value >> 8) & 0xFF, setup->value & 0xFF, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, &size);
-			break;
-		case LIBUSB_REQUEST_GET_CONFIGURATION:
-			r = windows_get_configuration(transfer->dev_handle, &config);
-			if (r == LIBUSB_SUCCESS) {
-				size = 1;
-				((uint8_t*)transfer->buffer)[LIBUSB_CONTROL_SETUP_SIZE] = (uint8_t)config;
-				r = LIBUSB_COMPLETED;
-			}
-			break;
-		case LIBUSB_REQUEST_SET_CONFIGURATION:
-			if (setup->value == priv->active_config) {
-				r = LIBUSB_COMPLETED;
-			} else {
-				usbi_warn(ctx, "cannot set configuration other than the default one");
-				r = LIBUSB_ERROR_INVALID_PARAM;
-			}
-			break;
-		case LIBUSB_REQUEST_GET_INTERFACE:
-			size = 1;
-			((uint8_t*)transfer->buffer)[LIBUSB_CONTROL_SETUP_SIZE] = 0;
-			r = LIBUSB_COMPLETED;
-			break;
-		case LIBUSB_REQUEST_SET_INTERFACE:
-			r = hid_set_interface_altsetting(0, transfer->dev_handle, setup->index, setup->value);
-			if (r == LIBUSB_SUCCESS) {
-				r = LIBUSB_COMPLETED;
-			}
-			break;
-		default:
-			usbi_warn(ctx, "unsupported HID control request");
-			r = LIBUSB_ERROR_INVALID_PARAM;
-			break;
-		}
-		break;
-	case LIBUSB_REQUEST_TYPE_CLASS:
-		r =_hid_class_request(priv->hid, wfd.handle, setup->request_type, setup->request, setup->value,
-			setup->index, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, transfer_priv,
-			&size, wfd.overlapped);
-		break;
-	default:
-		usbi_warn(ctx, "unsupported HID control request");
-		r = LIBUSB_ERROR_INVALID_PARAM;
-		break;
-	}
-
-	if (r == LIBUSB_COMPLETED) {
-		// Force request to be completed synchronously. Transferred size has been set by previous call
-		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
-		// http://msdn.microsoft.com/en-us/library/ms684342%28VS.85%29.aspx
-		// set InternalHigh to the number of bytes transferred
-		wfd.overlapped->InternalHigh = (DWORD)size;
-		r = LIBUSB_SUCCESS;
-	}
-
-	if (r == LIBUSB_SUCCESS) {
-		// Use priv_transfer to store data needed for async polling
-		transfer_priv->pollable_fd = wfd;
-		transfer_priv->interface_number = (uint8_t)current_interface;
-	} else {
-		usbi_free_fd(&wfd);
-	}
-
-	return r;
-}
-
-static int hid_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer) {
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	struct winfd wfd;
-	HANDLE hid_handle;
-	bool direction_in, ret;
-	int current_interface, length;
-	DWORD size;
-	int r = LIBUSB_SUCCESS;
-
-	CHECK_HID_AVAILABLE;
-
-	transfer_priv->pollable_fd = INVALID_WINFD;
-	transfer_priv->hid_dest = NULL;
-	safe_free(transfer_priv->hid_buffer);
-
-	current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface);
-
-	hid_handle = handle_priv->interface_handle[current_interface].api_handle;
-	direction_in = transfer->endpoint & LIBUSB_ENDPOINT_IN;
-
-	wfd = usbi_create_fd(hid_handle, direction_in?RW_READ:RW_WRITE, NULL, NULL);
-	// Always use the handle returned from usbi_create_fd (wfd.handle)
-	if (wfd.fd < 0) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	// If report IDs are not in use, an extra prefix byte must be added
-	if ( ((direction_in) && (!priv->hid->uses_report_ids[0]))
-	  || ((!direction_in) && (!priv->hid->uses_report_ids[1])) ) {
-		length = transfer->length+1;
-	} else {
-		length = transfer->length;
-	}
-	// Add a trailing byte to detect overflows on input
-	transfer_priv->hid_buffer = (uint8_t*)calloc(length+1, 1);
-	if (transfer_priv->hid_buffer == NULL) {
-		return LIBUSB_ERROR_NO_MEM;
-	}
-	transfer_priv->hid_expected_size = length;
-
-	if (direction_in) {
-		transfer_priv->hid_dest = transfer->buffer;
-		usbi_dbg("reading %d bytes (report ID: 0x00)", length);
-		ret = ReadFile(wfd.handle, transfer_priv->hid_buffer, length+1, &size, wfd.overlapped);
-	} else {
-		if (!priv->hid->uses_report_ids[1]) {
-			memcpy(transfer_priv->hid_buffer+1, transfer->buffer, transfer->length);
-		} else {
-			// We could actually do without the calloc and memcpy in this case
-			memcpy(transfer_priv->hid_buffer, transfer->buffer, transfer->length);
-		}
-		usbi_dbg("writing %d bytes (report ID: 0x%02X)", length, transfer_priv->hid_buffer[0]);
-		ret = WriteFile(wfd.handle, transfer_priv->hid_buffer, length, &size, wfd.overlapped);
-	}
-	if (!ret) {
-		if (GetLastError() != ERROR_IO_PENDING) {
-			usbi_err(ctx, "HID transfer failed: %s", windows_error_str(0));
-			usbi_free_fd(&wfd);
-			safe_free(transfer_priv->hid_buffer);
-			return LIBUSB_ERROR_IO;
-		}
-	} else {
-		// Only write operations that completed synchronously need to free up
-		// hid_buffer. For reads, copy_transfer_data() handles that process.
-		if (!direction_in) {
-			safe_free(transfer_priv->hid_buffer);
-		}
-		if (size == 0) {
-			usbi_err(ctx, "program assertion failed - no data was transferred");
-			size = 1;
-		}
-		if (size > (size_t)length) {
-			usbi_err(ctx, "OVERFLOW!");
-			r = LIBUSB_ERROR_OVERFLOW;
-		}
-		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
-		wfd.overlapped->InternalHigh = size;
-	}
-
-	transfer_priv->pollable_fd = wfd;
-	transfer_priv->interface_number = (uint8_t)current_interface;
-
-	return r;
-}
-
-static int hid_abort_transfers(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_transfer_priv *transfer_priv = (struct windows_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	HANDLE hid_handle;
-	int current_interface;
-
-	CHECK_HID_AVAILABLE;
-
-	current_interface = transfer_priv->interface_number;
-	hid_handle = handle_priv->interface_handle[current_interface].api_handle;
-	CancelIo(hid_handle);
-
-	return LIBUSB_SUCCESS;
-}
-
-static int hid_reset_device(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	HANDLE hid_handle;
-	int current_interface;
-
-	CHECK_HID_AVAILABLE;
-
-	// Flushing the queues on all interfaces is the best we can achieve
-	for (current_interface = 0; current_interface < USB_MAXINTERFACES; current_interface++) {
-		hid_handle = handle_priv->interface_handle[current_interface].api_handle;
-		if ((hid_handle != 0) && (hid_handle != INVALID_HANDLE_VALUE)) {
-			HidD_FlushQueue(hid_handle);
-		}
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int hid_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	HANDLE hid_handle;
-	int current_interface;
-
-	CHECK_HID_AVAILABLE;
-
-	current_interface = interface_by_endpoint(priv, handle_priv, endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cannot clear");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	usbi_dbg("matched endpoint %02X with interface %d", endpoint, current_interface);
-	hid_handle = handle_priv->interface_handle[current_interface].api_handle;
-
-	// No endpoint selection with Microsoft's implementation, so we try to flush the
-	// whole interface. Should be OK for most case scenarios
-	if (!HidD_FlushQueue(hid_handle)) {
-		usbi_err(ctx, "Flushing of HID queue failed: %s", windows_error_str(0));
-		// Device was probably disconnected
-		return LIBUSB_ERROR_NO_DEVICE;
-	}
-
-	return LIBUSB_SUCCESS;
-}
-
-// This extra function is only needed for HID
-static int hid_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size) {
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
-	int r = LIBUSB_TRANSFER_COMPLETED;
-	uint32_t corrected_size = io_size;
-
-	if (transfer_priv->hid_buffer != NULL) {
-		// If we have a valid hid_buffer, it means the transfer was async
-		if (transfer_priv->hid_dest != NULL) {	// Data readout
-			// First, check for overflow
-			if (corrected_size > transfer_priv->hid_expected_size) {
-				usbi_err(ctx, "OVERFLOW!");
-				corrected_size = (uint32_t)transfer_priv->hid_expected_size;
-				r = LIBUSB_TRANSFER_OVERFLOW;
-			}
-
-			if (transfer_priv->hid_buffer[0] == 0) {
-				// Discard the 1 byte report ID prefix
-				corrected_size--;
-				memcpy(transfer_priv->hid_dest, transfer_priv->hid_buffer+1, corrected_size);
-			} else {
-				memcpy(transfer_priv->hid_dest, transfer_priv->hid_buffer, corrected_size);
-			}
-			transfer_priv->hid_dest = NULL;
-		}
-		// For write, we just need to free the hid buffer
-		safe_free(transfer_priv->hid_buffer);
-	}
-	itransfer->transferred += corrected_size;
-	return r;
-}
-
-
-/*
- * Composite API functions
- */
-static int composite_init(int sub_api, struct libusb_context *ctx)
-{
-	return LIBUSB_SUCCESS;
-}
-
-static int composite_exit(int sub_api)
-{
-	return LIBUSB_SUCCESS;
-}
-
-static int composite_open(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	int r = LIBUSB_ERROR_NOT_FOUND;
-	uint8_t i;
-	// SUB_API_MAX+1 as the SUB_API_MAX pos is used to indicate availability of HID
-	bool available[SUB_API_MAX+1] = {0};
-
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		switch (priv->usb_interface[i].apib->id) {
-		case USB_API_WINUSBX:
-			if (priv->usb_interface[i].sub_api != SUB_API_NOTSET)
-				available[priv->usb_interface[i].sub_api] = true;
-			break;
-		case USB_API_HID:
-			available[SUB_API_MAX] = true;
-			break;
-		default:
-			break;
-		}
-	}
-
-	for (i=0; i<SUB_API_MAX; i++) {	// WinUSB-like drivers
-		if (available[i]) {
-			r = usb_api_backend[USB_API_WINUSBX].open(i, dev_handle);
-			if (r != LIBUSB_SUCCESS) {
-				return r;
-			}
-		}
-	}
-	if (available[SUB_API_MAX]) {	// HID driver
-		r = hid_open(SUB_API_NOTSET, dev_handle);
-	}
-	return r;
-}
-
-static void composite_close(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	uint8_t i;
-	bool available[SUB_API_MAX];
-
-	for (i = 0; i<SUB_API_MAX; i++) {
-		available[i] = false;
-	}
-
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		if ( (priv->usb_interface[i].apib->id == USB_API_WINUSBX)
-		  && (priv->usb_interface[i].sub_api != SUB_API_NOTSET) ) {
-			available[priv->usb_interface[i].sub_api] = true;
-		}
-	}
-
-	for (i=0; i<SUB_API_MAX; i++) {
-		if (available[i]) {
-			usb_api_backend[USB_API_WINUSBX].close(i, dev_handle);
-		}
-	}
-}
-
-static int composite_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	return priv->usb_interface[iface].apib->
-		claim_interface(priv->usb_interface[iface].sub_api, dev_handle, iface);
-}
-
-static int composite_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	return priv->usb_interface[iface].apib->
-		set_interface_altsetting(priv->usb_interface[iface].sub_api, dev_handle, iface, altsetting);
-}
-
-static int composite_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	return priv->usb_interface[iface].apib->
-		release_interface(priv->usb_interface[iface].sub_api, dev_handle, iface);
-}
-
-static int composite_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int i, pass;
-
-	// Interface shouldn't matter for control, but it does in practice, with Windows'
-	// restrictions with regards to accessing HID keyboards and mice. Try a 2 pass approach
-	for (pass = 0; pass < 2; pass++) {
-		for (i=0; i<USB_MAXINTERFACES; i++) {
-			if (priv->usb_interface[i].path != NULL) {
-				if ((pass == 0) && (priv->usb_interface[i].restricted_functionality)) {
-					usbi_dbg("trying to skip restricted interface #%d (HID keyboard or mouse?)", i);
-					continue;
-				}
-				usbi_dbg("using interface %d", i);
-				return priv->usb_interface[i].apib->submit_control_transfer(priv->usb_interface[i].sub_api, itransfer);
-			}
-		}
-	}
-
-	usbi_err(ctx, "no libusbx supported interfaces to complete request");
-	return LIBUSB_ERROR_NOT_FOUND;
-}
-
-static int composite_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer) {
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int current_interface;
-
-	current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	return priv->usb_interface[current_interface].apib->
-		submit_bulk_transfer(priv->usb_interface[current_interface].sub_api, itransfer);}
-
-static int composite_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer) {
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-	int current_interface;
-
-	current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	return priv->usb_interface[current_interface].apib->
-		submit_iso_transfer(priv->usb_interface[current_interface].sub_api, itransfer);}
-
-static int composite_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint)
-{
-	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
-	struct windows_device_handle_priv *handle_priv = _device_handle_priv(dev_handle);
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	int current_interface;
-
-	current_interface = interface_by_endpoint(priv, handle_priv, endpoint);
-	if (current_interface < 0) {
-		usbi_err(ctx, "unable to match endpoint to an open interface - cannot clear");
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	return priv->usb_interface[current_interface].apib->
-		clear_halt(priv->usb_interface[current_interface].sub_api, dev_handle, endpoint);}
-
-static int composite_abort_control(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-
-	return priv->usb_interface[transfer_priv->interface_number].apib->
-		abort_control(priv->usb_interface[transfer_priv->interface_number].sub_api, itransfer);}
-
-static int composite_abort_transfers(int sub_api, struct usbi_transfer *itransfer)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-
-	return priv->usb_interface[transfer_priv->interface_number].apib->
-		abort_transfers(priv->usb_interface[transfer_priv->interface_number].sub_api, itransfer);}
-
-static int composite_reset_device(int sub_api, struct libusb_device_handle *dev_handle)
-{
-	struct windows_device_priv *priv = _device_priv(dev_handle->dev);
-	int r;
-	uint8_t i; 
-	bool available[SUB_API_MAX];
-	for (i = 0; i<SUB_API_MAX; i++) {
-		available[i] = false;
-	}
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		if ( (priv->usb_interface[i].apib->id == USB_API_WINUSBX)
-		  && (priv->usb_interface[i].sub_api != SUB_API_NOTSET) ) {
-			available[priv->usb_interface[i].sub_api] = true;
-		}
-	}
-	for (i=0; i<SUB_API_MAX; i++) {
-		if (available[i]) {
-			r = usb_api_backend[USB_API_WINUSBX].reset_device(i, dev_handle);
-			if (r != LIBUSB_SUCCESS) {
-				return r;
-			}
-		}
-	}
-	return LIBUSB_SUCCESS;
-}
-
-static int composite_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size)
-{
-	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-	struct windows_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
-	struct windows_device_priv *priv = _device_priv(transfer->dev_handle->dev);
-
-	return priv->usb_interface[transfer_priv->interface_number].apib->
-		copy_transfer_data(priv->usb_interface[transfer_priv->interface_number].sub_api, itransfer, io_size);
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_usb.h b/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_usb.h
deleted file mode 100644
index 5d67a562e8..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/os/windows_usb.h
+++ /dev/null
@@ -1,918 +0,0 @@
-/*
- * Windows backend for libusbx 1.0
- * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
- * Major code testing contribution by Xiaofan Chen
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#pragma once
-
-#include "windows_common.h"
-
-#if defined(_MSC_VER)
-// disable /W4 MSVC warnings that are benign
-#pragma warning(disable:4127) // conditional expression is constant
-#pragma warning(disable:4100) // unreferenced formal parameter
-#pragma warning(disable:4214) // bit field types other than int
-#pragma warning(disable:4201) // nameless struct/union
-#endif
-
-// Missing from MSVC6 setupapi.h
-#if !defined(SPDRP_ADDRESS)
-#define SPDRP_ADDRESS	28
-#endif
-#if !defined(SPDRP_INSTALL_STATE)
-#define SPDRP_INSTALL_STATE	34
-#endif
-
-#if defined(__CYGWIN__ )
-#define _stricmp stricmp
-// cygwin produces a warning unless these prototypes are defined
-extern int _snprintf(char *buffer, size_t count, const char *format, ...);
-extern char *_strdup(const char *strSource);
-// _beginthreadex is MSVCRT => unavailable for cygwin. Fallback to using CreateThread
-#define _beginthreadex(a, b, c, d, e, f) CreateThread(a, b, (LPTHREAD_START_ROUTINE)c, d, e, f)
-#endif
-
-#define MAX_CTRL_BUFFER_LENGTH      4096
-#define MAX_USB_DEVICES             256
-#define MAX_USB_STRING_LENGTH       128
-#define MAX_HID_REPORT_SIZE         1024
-#define MAX_HID_DESCRIPTOR_SIZE     256
-#define MAX_GUID_STRING_LENGTH      40
-#define MAX_PATH_LENGTH             128
-#define MAX_KEY_LENGTH              256
-#define LIST_SEPARATOR              ';'
-#define HTAB_SIZE                   1021
-
-// Handle code for HID interface that have been claimed ("dibs")
-#define INTERFACE_CLAIMED           ((HANDLE)(intptr_t)0xD1B5)
-// Additional return code for HID operations that completed synchronously
-#define LIBUSB_COMPLETED            (LIBUSB_SUCCESS + 1)
-
-// http://msdn.microsoft.com/en-us/library/ff545978.aspx
-// http://msdn.microsoft.com/en-us/library/ff545972.aspx
-// http://msdn.microsoft.com/en-us/library/ff545982.aspx
-#if !defined(GUID_DEVINTERFACE_USB_HOST_CONTROLLER)
-const GUID GUID_DEVINTERFACE_USB_HOST_CONTROLLER = { 0x3ABF6F2D, 0x71C4, 0x462A, {0x8A, 0x92, 0x1E, 0x68, 0x61, 0xE6, 0xAF, 0x27} };
-#endif
-#if !defined(GUID_DEVINTERFACE_USB_DEVICE)
-const GUID GUID_DEVINTERFACE_USB_DEVICE = { 0xA5DCBF10, 0x6530, 0x11D2, {0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED} };
-#endif
-#if !defined(GUID_DEVINTERFACE_USB_HUB)
-const GUID GUID_DEVINTERFACE_USB_HUB = { 0xF18A0E88, 0xC30C, 0x11D0, {0x88, 0x15, 0x00, 0xA0, 0xC9, 0x06, 0xBE, 0xD8} };
-#endif
-#if !defined(GUID_DEVINTERFACE_LIBUSB0_FILTER)
-const GUID GUID_DEVINTERFACE_LIBUSB0_FILTER = { 0xF9F3FF14, 0xAE21, 0x48A0, {0x8A, 0x25, 0x80, 0x11, 0xA7, 0xA9, 0x31, 0xD9} };
-#endif
-
-
-/*
- * Multiple USB API backend support
- */
-#define USB_API_UNSUPPORTED 0
-#define USB_API_HUB         1
-#define USB_API_COMPOSITE   2
-#define USB_API_WINUSBX     3
-#define USB_API_HID         4
-#define USB_API_MAX         5
-// The following is used to indicate if the HID or composite extra props have already been set.
-#define USB_API_SET         (1<<USB_API_MAX) 
-
-// Sub-APIs for WinUSB-like driver APIs (WinUSB, libusbK, libusb-win32 through the libusbK DLL)
-// Must have the same values as the KUSB_DRVID enum from libusbk.h
-#define SUB_API_NOTSET      -1
-#define SUB_API_LIBUSBK     0
-#define SUB_API_LIBUSB0     1
-#define SUB_API_WINUSB      2
-#define SUB_API_MAX         3
-
-#define WINUSBX_DRV_NAMES   { "libusbK", "libusb0", "WinUSB"}
-
-struct windows_usb_api_backend {
-	const uint8_t id;
-	const char* designation;
-	const char **driver_name_list; // Driver name, without .sys, e.g. "usbccgp"
-	const uint8_t nb_driver_names;
-	int (*init)(int sub_api, struct libusb_context *ctx);
-	int (*exit)(int sub_api);
-	int (*open)(int sub_api, struct libusb_device_handle *dev_handle);
-	void (*close)(int sub_api, struct libusb_device_handle *dev_handle);
-	int (*configure_endpoints)(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-	int (*claim_interface)(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-	int (*set_interface_altsetting)(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting);
-	int (*release_interface)(int sub_api, struct libusb_device_handle *dev_handle, int iface);
-	int (*clear_halt)(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
-	int (*reset_device)(int sub_api, struct libusb_device_handle *dev_handle);
-	int (*submit_bulk_transfer)(int sub_api, struct usbi_transfer *itransfer);
-	int (*submit_iso_transfer)(int sub_api, struct usbi_transfer *itransfer);
-	int (*submit_control_transfer)(int sub_api, struct usbi_transfer *itransfer);
-	int (*abort_control)(int sub_api, struct usbi_transfer *itransfer);
-	int (*abort_transfers)(int sub_api, struct usbi_transfer *itransfer);
-	int (*copy_transfer_data)(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size);
-};
-
-extern const struct windows_usb_api_backend usb_api_backend[USB_API_MAX];
-
-#define PRINT_UNSUPPORTED_API(fname)              \
-	usbi_dbg("unsupported API call for '"         \
-		#fname "' (unrecognized device driver)"); \
-	return LIBUSB_ERROR_NOT_SUPPORTED;
-
-/*
- * private structures definition
- * with inline pseudo constructors/destructors
- */
-
-// TODO (v2+): move hid desc to libusb.h?
-struct libusb_hid_descriptor {
-	uint8_t  bLength;
-	uint8_t  bDescriptorType;
-	uint16_t bcdHID;
-	uint8_t  bCountryCode;
-	uint8_t  bNumDescriptors;
-	uint8_t  bClassDescriptorType;
-	uint16_t wClassDescriptorLength;
-};
-#define LIBUSB_DT_HID_SIZE              9
-#define HID_MAX_CONFIG_DESC_SIZE (LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE \
-	+ LIBUSB_DT_HID_SIZE + 2 * LIBUSB_DT_ENDPOINT_SIZE)
-#define HID_MAX_REPORT_SIZE             1024
-#define HID_IN_EP                       0x81
-#define HID_OUT_EP                      0x02
-#define LIBUSB_REQ_RECIPIENT(request_type) ((request_type) & 0x1F)
-#define LIBUSB_REQ_TYPE(request_type) ((request_type) & (0x03 << 5))
-#define LIBUSB_REQ_IN(request_type) ((request_type) & LIBUSB_ENDPOINT_IN)
-#define LIBUSB_REQ_OUT(request_type) (!LIBUSB_REQ_IN(request_type))
-
-// The following are used for HID reports IOCTLs
-#define HID_CTL_CODE(id) \
-  CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_NEITHER, FILE_ANY_ACCESS)
-#define HID_BUFFER_CTL_CODE(id) \
-  CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_BUFFERED, FILE_ANY_ACCESS)
-#define HID_IN_CTL_CODE(id) \
-  CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_IN_DIRECT, FILE_ANY_ACCESS)
-#define HID_OUT_CTL_CODE(id) \
-  CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_OUT_DIRECT, FILE_ANY_ACCESS)
-
-#define IOCTL_HID_GET_FEATURE                 HID_OUT_CTL_CODE(100)
-#define IOCTL_HID_GET_INPUT_REPORT            HID_OUT_CTL_CODE(104)
-#define IOCTL_HID_SET_FEATURE                 HID_IN_CTL_CODE(100)
-#define IOCTL_HID_SET_OUTPUT_REPORT           HID_IN_CTL_CODE(101)
-
-enum libusb_hid_request_type {
-	HID_REQ_GET_REPORT = 0x01,
-	HID_REQ_GET_IDLE = 0x02,
-	HID_REQ_GET_PROTOCOL = 0x03,
-	HID_REQ_SET_REPORT = 0x09,
-	HID_REQ_SET_IDLE = 0x0A,
-	HID_REQ_SET_PROTOCOL = 0x0B
-};
-
-enum libusb_hid_report_type {
-	HID_REPORT_TYPE_INPUT = 0x01,
-	HID_REPORT_TYPE_OUTPUT = 0x02,
-	HID_REPORT_TYPE_FEATURE = 0x03
-};
-
-struct hid_device_priv {
-	uint16_t vid;
-	uint16_t pid;
-	uint8_t config;
-	uint8_t nb_interfaces;
-	bool uses_report_ids[3];	// input, ouptput, feature
-	uint16_t input_report_size;
-	uint16_t output_report_size;
-	uint16_t feature_report_size;
-	WCHAR string[3][MAX_USB_STRING_LENGTH];
-	uint8_t string_index[3];	// man, prod, ser
-};
-
-typedef struct libusb_device_descriptor USB_DEVICE_DESCRIPTOR, *PUSB_DEVICE_DESCRIPTOR;
-struct windows_device_priv {
-	uint8_t depth;						// distance to HCD
-	uint8_t port;						// port number on the hub
-	uint8_t active_config;
-	struct libusb_device *parent_dev;	// access to parent is required for usermode ops
-	struct windows_usb_api_backend const *apib;
-	char *path;							// device interface path
-	int sub_api;						// for WinUSB-like APIs
-	struct {
-		char *path;						// each interface needs a device interface path,
-		struct windows_usb_api_backend const *apib; // an API backend (multiple drivers support),
-		int sub_api;
-		int8_t nb_endpoints;			// and a set of endpoint addresses (USB_MAXENDPOINTS)
-		uint8_t *endpoint;
-		bool restricted_functionality;	// indicates if the interface functionality is restricted
-										// by Windows (eg. HID keyboards or mice cannot do R/W)
-	} usb_interface[USB_MAXINTERFACES];
-	struct hid_device_priv *hid;
-	USB_DEVICE_DESCRIPTOR dev_descriptor;
-	unsigned char **config_descriptor;	// list of pointers to the cached config descriptors
-};
-
-static inline struct windows_device_priv *_device_priv(struct libusb_device *dev) {
-	return (struct windows_device_priv *)dev->os_priv;
-}
-
-static inline void windows_device_priv_init(libusb_device* dev) {
-	struct windows_device_priv* p = _device_priv(dev);
-	int i;
-	p->depth = 0;
-	p->port = 0;
-	p->parent_dev = NULL;
-	p->path = NULL;
-	p->apib = &usb_api_backend[USB_API_UNSUPPORTED];
-	p->sub_api = SUB_API_NOTSET;
-	p->hid = NULL;
-	p->active_config = 0;
-	p->config_descriptor = NULL;
-	memset(&(p->dev_descriptor), 0, sizeof(USB_DEVICE_DESCRIPTOR));
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		p->usb_interface[i].path = NULL;
-		p->usb_interface[i].apib = &usb_api_backend[USB_API_UNSUPPORTED];
-		p->usb_interface[i].sub_api = SUB_API_NOTSET;
-		p->usb_interface[i].nb_endpoints = 0;
-		p->usb_interface[i].endpoint = NULL;
-		p->usb_interface[i].restricted_functionality = false;
-	}
-}
-
-static inline void windows_device_priv_release(libusb_device* dev) {
-	struct windows_device_priv* p = _device_priv(dev);
-	int i;
-	safe_free(p->path);
-	if ((dev->num_configurations > 0) && (p->config_descriptor != NULL)) {
-		for (i=0; i < dev->num_configurations; i++)
-			safe_free(p->config_descriptor[i]);
-	}
-	safe_free(p->config_descriptor);
-	safe_free(p->hid);
-	for (i=0; i<USB_MAXINTERFACES; i++) {
-		safe_free(p->usb_interface[i].path);
-		safe_free(p->usb_interface[i].endpoint);
-	}
-}
-
-struct interface_handle_t {
-	HANDLE dev_handle; // WinUSB needs an extra handle for the file
-	HANDLE api_handle; // used by the API to communicate with the device
-};
-
-struct windows_device_handle_priv {
-	int active_interface;
-	struct interface_handle_t interface_handle[USB_MAXINTERFACES];
-	int autoclaim_count[USB_MAXINTERFACES]; // For auto-release
-};
-
-static inline struct windows_device_handle_priv *_device_handle_priv(
-	struct libusb_device_handle *handle)
-{
-	return (struct windows_device_handle_priv *) handle->os_priv;
-}
-
-// used for async polling functions
-struct windows_transfer_priv {
-	struct winfd pollable_fd;
-	uint8_t interface_number;
-	uint8_t *hid_buffer; // 1 byte extended data buffer, required for HID
-	uint8_t *hid_dest;   // transfer buffer destination, required for HID
-	size_t hid_expected_size;
-};
-
-// used to match a device driver (including filter drivers) against a supported API
-struct driver_lookup {
-	char list[MAX_KEY_LENGTH+1];// REG_MULTI_SZ list of services (driver) names
-	const DWORD reg_prop;		// SPDRP registry key to use to retreive list
-	const char* designation;	// internal designation (for debug output)
-};
-
-/* OLE32 dependency */
-DLL_DECLARE_PREFIXED(WINAPI, HRESULT, p, CLSIDFromString, (LPCOLESTR, LPCLSID));
-
-/* SetupAPI dependencies */
-DLL_DECLARE_PREFIXED(WINAPI, HDEVINFO, p, SetupDiGetClassDevsA, (const GUID*, PCSTR, HWND, DWORD));
-DLL_DECLARE_PREFIXED(WINAPI, BOOL, p, SetupDiEnumDeviceInfo, (HDEVINFO, DWORD, PSP_DEVINFO_DATA));
-DLL_DECLARE_PREFIXED(WINAPI, BOOL, p, SetupDiEnumDeviceInterfaces, (HDEVINFO, PSP_DEVINFO_DATA,
-			const GUID*, DWORD, PSP_DEVICE_INTERFACE_DATA));
-DLL_DECLARE_PREFIXED(WINAPI, BOOL, p, SetupDiGetDeviceInterfaceDetailA, (HDEVINFO, PSP_DEVICE_INTERFACE_DATA,
-			PSP_DEVICE_INTERFACE_DETAIL_DATA_A, DWORD, PDWORD, PSP_DEVINFO_DATA));
-DLL_DECLARE_PREFIXED(WINAPI, BOOL, p, SetupDiDestroyDeviceInfoList, (HDEVINFO));
-DLL_DECLARE_PREFIXED(WINAPI, HKEY, p, SetupDiOpenDevRegKey, (HDEVINFO, PSP_DEVINFO_DATA, DWORD, DWORD, DWORD, REGSAM));
-DLL_DECLARE_PREFIXED(WINAPI, BOOL, p, SetupDiGetDeviceRegistryPropertyA, (HDEVINFO,
-			PSP_DEVINFO_DATA, DWORD, PDWORD, PBYTE, DWORD, PDWORD));
-DLL_DECLARE_PREFIXED(WINAPI, HKEY, p, SetupDiOpenDeviceInterfaceRegKey, (HDEVINFO, PSP_DEVICE_INTERFACE_DATA, DWORD, DWORD));
-DLL_DECLARE_PREFIXED(WINAPI, LONG, p, RegQueryValueExW, (HKEY, LPCWSTR, LPDWORD, LPDWORD, LPBYTE, LPDWORD));
-DLL_DECLARE_PREFIXED(WINAPI, LONG, p, RegCloseKey, (HKEY));
-
-/*
- * Windows DDK API definitions. Most of it copied from MinGW's includes
- */
-typedef DWORD DEVNODE, DEVINST;
-typedef DEVNODE *PDEVNODE, *PDEVINST;
-typedef DWORD RETURN_TYPE;
-typedef RETURN_TYPE CONFIGRET;
-
-#define CR_SUCCESS                              0x00000000
-#define CR_NO_SUCH_DEVNODE                      0x0000000D
-
-#define USB_DEVICE_DESCRIPTOR_TYPE              LIBUSB_DT_DEVICE
-#define USB_CONFIGURATION_DESCRIPTOR_TYPE       LIBUSB_DT_CONFIG
-#define USB_STRING_DESCRIPTOR_TYPE              LIBUSB_DT_STRING
-#define USB_INTERFACE_DESCRIPTOR_TYPE           LIBUSB_DT_INTERFACE
-#define USB_ENDPOINT_DESCRIPTOR_TYPE            LIBUSB_DT_ENDPOINT
-
-#define USB_REQUEST_GET_STATUS                  LIBUSB_REQUEST_GET_STATUS
-#define USB_REQUEST_CLEAR_FEATURE               LIBUSB_REQUEST_CLEAR_FEATURE
-#define USB_REQUEST_SET_FEATURE                 LIBUSB_REQUEST_SET_FEATURE
-#define USB_REQUEST_SET_ADDRESS                 LIBUSB_REQUEST_SET_ADDRESS
-#define USB_REQUEST_GET_DESCRIPTOR              LIBUSB_REQUEST_GET_DESCRIPTOR
-#define USB_REQUEST_SET_DESCRIPTOR              LIBUSB_REQUEST_SET_DESCRIPTOR
-#define USB_REQUEST_GET_CONFIGURATION           LIBUSB_REQUEST_GET_CONFIGURATION
-#define USB_REQUEST_SET_CONFIGURATION           LIBUSB_REQUEST_SET_CONFIGURATION
-#define USB_REQUEST_GET_INTERFACE               LIBUSB_REQUEST_GET_INTERFACE
-#define USB_REQUEST_SET_INTERFACE               LIBUSB_REQUEST_SET_INTERFACE
-#define USB_REQUEST_SYNC_FRAME                  LIBUSB_REQUEST_SYNCH_FRAME
-
-#define USB_GET_NODE_INFORMATION                258
-#define USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION 260
-#define USB_GET_NODE_CONNECTION_NAME            261
-#define USB_GET_HUB_CAPABILITIES                271
-#if !defined(USB_GET_NODE_CONNECTION_INFORMATION_EX)
-#define USB_GET_NODE_CONNECTION_INFORMATION_EX  274
-#endif
-#if !defined(USB_GET_HUB_CAPABILITIES_EX)
-#define USB_GET_HUB_CAPABILITIES_EX             276
-#endif
-
-#ifndef METHOD_BUFFERED
-#define METHOD_BUFFERED                         0
-#endif
-#ifndef FILE_ANY_ACCESS
-#define FILE_ANY_ACCESS                         0x00000000
-#endif
-#ifndef FILE_DEVICE_UNKNOWN
-#define FILE_DEVICE_UNKNOWN                     0x00000022
-#endif
-#ifndef FILE_DEVICE_USB
-#define FILE_DEVICE_USB                         FILE_DEVICE_UNKNOWN
-#endif
-
-#ifndef CTL_CODE
-#define CTL_CODE(DeviceType, Function, Method, Access)( \
-  ((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method))
-#endif
-
-typedef enum USB_CONNECTION_STATUS {
-	NoDeviceConnected,
-	DeviceConnected,
-	DeviceFailedEnumeration,
-	DeviceGeneralFailure,
-	DeviceCausedOvercurrent,
-	DeviceNotEnoughPower,
-	DeviceNotEnoughBandwidth,
-	DeviceHubNestedTooDeeply,
-	DeviceInLegacyHub
-} USB_CONNECTION_STATUS, *PUSB_CONNECTION_STATUS;
-
-typedef enum USB_HUB_NODE {
-	UsbHub,
-	UsbMIParent
-} USB_HUB_NODE;
-
-/* Cfgmgr32.dll interface */
-DLL_DECLARE(WINAPI, CONFIGRET, CM_Get_Parent, (PDEVINST, DEVINST, ULONG));
-DLL_DECLARE(WINAPI, CONFIGRET, CM_Get_Child, (PDEVINST, DEVINST, ULONG));
-DLL_DECLARE(WINAPI, CONFIGRET, CM_Get_Sibling, (PDEVINST, DEVINST, ULONG));
-DLL_DECLARE(WINAPI, CONFIGRET, CM_Get_Device_IDA, (DEVINST, PCHAR, ULONG, ULONG));
-
-#define IOCTL_USB_GET_HUB_CAPABILITIES_EX \
-  CTL_CODE( FILE_DEVICE_USB, USB_GET_HUB_CAPABILITIES_EX, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_HUB_CAPABILITIES \
-  CTL_CODE(FILE_DEVICE_USB, USB_GET_HUB_CAPABILITIES, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION \
-  CTL_CODE(FILE_DEVICE_USB, USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_ROOT_HUB_NAME \
-  CTL_CODE(FILE_DEVICE_USB, HCD_GET_ROOT_HUB_NAME, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_NODE_INFORMATION \
-  CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_INFORMATION, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX \
-  CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_INFORMATION_EX, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_NODE_CONNECTION_ATTRIBUTES \
-  CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_ATTRIBUTES, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-#define IOCTL_USB_GET_NODE_CONNECTION_NAME \
-  CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_NAME, METHOD_BUFFERED, FILE_ANY_ACCESS)
-
-// Most of the structures below need to be packed
-#pragma pack(push, 1)
-
-typedef struct USB_INTERFACE_DESCRIPTOR {
-  UCHAR  bLength;
-  UCHAR  bDescriptorType;
-  UCHAR  bInterfaceNumber;
-  UCHAR  bAlternateSetting;
-  UCHAR  bNumEndpoints;
-  UCHAR  bInterfaceClass;
-  UCHAR  bInterfaceSubClass;
-  UCHAR  bInterfaceProtocol;
-  UCHAR  iInterface;
-} USB_INTERFACE_DESCRIPTOR, *PUSB_INTERFACE_DESCRIPTOR;
-
-typedef struct USB_CONFIGURATION_DESCRIPTOR {
-  UCHAR  bLength;
-  UCHAR  bDescriptorType;
-  USHORT wTotalLength;
-  UCHAR  bNumInterfaces;
-  UCHAR  bConfigurationValue;
-  UCHAR  iConfiguration;
-  UCHAR  bmAttributes;
-  UCHAR  MaxPower;
-} USB_CONFIGURATION_DESCRIPTOR, *PUSB_CONFIGURATION_DESCRIPTOR;
-
-typedef struct USB_CONFIGURATION_DESCRIPTOR_SHORT {
-	struct {
-		ULONG ConnectionIndex;
-		struct {
-			UCHAR bmRequest;
-			UCHAR bRequest;
-			USHORT wValue;
-			USHORT wIndex;
-			USHORT wLength;
-		} SetupPacket;
-	} req;
-	USB_CONFIGURATION_DESCRIPTOR data;
-} USB_CONFIGURATION_DESCRIPTOR_SHORT;
-
-typedef struct USB_ENDPOINT_DESCRIPTOR {
-  UCHAR  bLength;
-  UCHAR  bDescriptorType;
-  UCHAR  bEndpointAddress;
-  UCHAR  bmAttributes;
-  USHORT  wMaxPacketSize;
-  UCHAR  bInterval;
-} USB_ENDPOINT_DESCRIPTOR, *PUSB_ENDPOINT_DESCRIPTOR;
-
-typedef struct USB_DESCRIPTOR_REQUEST {
-	ULONG  ConnectionIndex;
-	struct {
-		UCHAR  bmRequest;
-		UCHAR  bRequest;
-		USHORT  wValue;
-		USHORT  wIndex;
-		USHORT  wLength;
-	} SetupPacket;
-//	UCHAR  Data[0];
-} USB_DESCRIPTOR_REQUEST, *PUSB_DESCRIPTOR_REQUEST;
-
-typedef struct USB_HUB_DESCRIPTOR {
-	UCHAR  bDescriptorLength;
-	UCHAR  bDescriptorType;
-	UCHAR  bNumberOfPorts;
-	USHORT  wHubCharacteristics;
-	UCHAR  bPowerOnToPowerGood;
-	UCHAR  bHubControlCurrent;
-	UCHAR  bRemoveAndPowerMask[64];
-} USB_HUB_DESCRIPTOR, *PUSB_HUB_DESCRIPTOR;
-
-typedef struct USB_ROOT_HUB_NAME {
-	ULONG  ActualLength;
-	WCHAR  RootHubName[1];
-} USB_ROOT_HUB_NAME, *PUSB_ROOT_HUB_NAME;
-
-typedef struct USB_ROOT_HUB_NAME_FIXED {
-	ULONG ActualLength;
-	WCHAR RootHubName[MAX_PATH_LENGTH];
-} USB_ROOT_HUB_NAME_FIXED;
-
-typedef struct USB_NODE_CONNECTION_NAME {
-	ULONG  ConnectionIndex;
-	ULONG  ActualLength;
-	WCHAR  NodeName[1];
-} USB_NODE_CONNECTION_NAME, *PUSB_NODE_CONNECTION_NAME;
-
-typedef struct USB_NODE_CONNECTION_NAME_FIXED {
-	ULONG ConnectionIndex;
-	ULONG ActualLength;
-	WCHAR NodeName[MAX_PATH_LENGTH];
-} USB_NODE_CONNECTION_NAME_FIXED;
-
-typedef struct USB_HUB_NAME_FIXED {
-	union {
-		USB_ROOT_HUB_NAME_FIXED root;
-		USB_NODE_CONNECTION_NAME_FIXED node;
-	} u;
-} USB_HUB_NAME_FIXED;
-
-typedef struct USB_HUB_INFORMATION {
-	USB_HUB_DESCRIPTOR  HubDescriptor;
-	BOOLEAN  HubIsBusPowered;
-} USB_HUB_INFORMATION, *PUSB_HUB_INFORMATION;
-
-typedef struct USB_MI_PARENT_INFORMATION {
-  ULONG  NumberOfInterfaces;
-} USB_MI_PARENT_INFORMATION, *PUSB_MI_PARENT_INFORMATION;
-
-typedef struct USB_NODE_INFORMATION {
-	USB_HUB_NODE  NodeType;
-	union {
-		USB_HUB_INFORMATION  HubInformation;
-		USB_MI_PARENT_INFORMATION  MiParentInformation;
-	} u;
-} USB_NODE_INFORMATION, *PUSB_NODE_INFORMATION;
-
-typedef struct USB_PIPE_INFO {
-	USB_ENDPOINT_DESCRIPTOR  EndpointDescriptor;
-	ULONG  ScheduleOffset;
-} USB_PIPE_INFO, *PUSB_PIPE_INFO;
-
-typedef struct USB_NODE_CONNECTION_INFORMATION_EX {
-	ULONG  ConnectionIndex;
-	USB_DEVICE_DESCRIPTOR  DeviceDescriptor;
-	UCHAR  CurrentConfigurationValue;
-	UCHAR  Speed;
-	BOOLEAN  DeviceIsHub;
-	USHORT  DeviceAddress;
-	ULONG  NumberOfOpenPipes;
-	USB_CONNECTION_STATUS  ConnectionStatus;
-//	USB_PIPE_INFO  PipeList[0];
-} USB_NODE_CONNECTION_INFORMATION_EX, *PUSB_NODE_CONNECTION_INFORMATION_EX;
-
-typedef struct USB_HUB_CAP_FLAGS {
-	ULONG HubIsHighSpeedCapable:1;
-	ULONG HubIsHighSpeed:1;
-	ULONG HubIsMultiTtCapable:1;
-	ULONG HubIsMultiTt:1;
-	ULONG HubIsRoot:1;
-	ULONG HubIsArmedWakeOnConnect:1;
-	ULONG ReservedMBZ:26;
-} USB_HUB_CAP_FLAGS, *PUSB_HUB_CAP_FLAGS;
-
-typedef struct USB_HUB_CAPABILITIES {
-  ULONG  HubIs2xCapable : 1;
-} USB_HUB_CAPABILITIES, *PUSB_HUB_CAPABILITIES;
-
-typedef struct USB_HUB_CAPABILITIES_EX {
-	USB_HUB_CAP_FLAGS CapabilityFlags;
-} USB_HUB_CAPABILITIES_EX, *PUSB_HUB_CAPABILITIES_EX;
-
-#pragma pack(pop)
-
-/* winusb.dll interface */
-
-#define SHORT_PACKET_TERMINATE  0x01
-#define AUTO_CLEAR_STALL        0x02
-#define PIPE_TRANSFER_TIMEOUT   0x03
-#define IGNORE_SHORT_PACKETS    0x04
-#define ALLOW_PARTIAL_READS     0x05
-#define AUTO_FLUSH              0x06
-#define RAW_IO                  0x07
-#define MAXIMUM_TRANSFER_SIZE   0x08
-#define AUTO_SUSPEND            0x81
-#define SUSPEND_DELAY           0x83
-#define DEVICE_SPEED            0x01
-#define LowSpeed                0x01
-#define FullSpeed               0x02
-#define HighSpeed               0x03
-
-typedef enum USBD_PIPE_TYPE {
-	UsbdPipeTypeControl,
-	UsbdPipeTypeIsochronous,
-	UsbdPipeTypeBulk,
-	UsbdPipeTypeInterrupt
-} USBD_PIPE_TYPE;
-
-typedef struct {
-  USBD_PIPE_TYPE PipeType;
-  UCHAR          PipeId;
-  USHORT         MaximumPacketSize;
-  UCHAR          Interval;
-} WINUSB_PIPE_INFORMATION, *PWINUSB_PIPE_INFORMATION;
-
-#pragma pack(1)
-typedef struct {
-  UCHAR  request_type;
-  UCHAR  request;
-  USHORT value;
-  USHORT index;
-  USHORT length;
-} WINUSB_SETUP_PACKET, *PWINUSB_SETUP_PACKET;
-#pragma pack()
-
-typedef void *WINUSB_INTERFACE_HANDLE, *PWINUSB_INTERFACE_HANDLE;
-
-typedef BOOL (WINAPI *WinUsb_AbortPipe_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID
-);
-typedef BOOL (WINAPI *WinUsb_ControlTransfer_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	WINUSB_SETUP_PACKET SetupPacket,
-	PUCHAR Buffer,
-	ULONG BufferLength,
-	PULONG LengthTransferred,
-	LPOVERLAPPED Overlapped
-);
-typedef BOOL (WINAPI *WinUsb_FlushPipe_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID
-);
-typedef BOOL (WINAPI *WinUsb_Free_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle
-);
-typedef BOOL (WINAPI *WinUsb_GetAssociatedInterface_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR AssociatedInterfaceIndex,
-	PWINUSB_INTERFACE_HANDLE AssociatedInterfaceHandle
-);
-typedef BOOL (WINAPI *WinUsb_GetCurrentAlternateSetting_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	PUCHAR AlternateSetting
-);
-typedef BOOL (WINAPI *WinUsb_GetDescriptor_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR DescriptorType,
-	UCHAR Index,
-	USHORT LanguageID,
-	PUCHAR Buffer,
-	ULONG BufferLength,
-	PULONG LengthTransferred
-);
-typedef BOOL (WINAPI *WinUsb_GetOverlappedResult_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	LPOVERLAPPED lpOverlapped,
-	LPDWORD lpNumberOfBytesTransferred,
-	BOOL bWait
-);
-typedef BOOL (WINAPI *WinUsb_GetPipePolicy_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID,
-	ULONG PolicyType,
-	PULONG ValueLength,
-	PVOID Value
-);
-typedef BOOL (WINAPI *WinUsb_GetPowerPolicy_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	ULONG PolicyType,
-	PULONG ValueLength,
-	PVOID Value
-);
-typedef BOOL (WINAPI *WinUsb_Initialize_t)(
-	HANDLE DeviceHandle,
-	PWINUSB_INTERFACE_HANDLE InterfaceHandle
-);
-typedef BOOL (WINAPI *WinUsb_QueryDeviceInformation_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	ULONG InformationType,
-	PULONG BufferLength,
-	PVOID Buffer
-);
-typedef BOOL (WINAPI *WinUsb_QueryInterfaceSettings_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR AlternateSettingNumber,
-	PUSB_INTERFACE_DESCRIPTOR UsbAltInterfaceDescriptor
-);
-typedef BOOL (WINAPI *WinUsb_QueryPipe_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR AlternateInterfaceNumber,
-	UCHAR PipeIndex,
-	PWINUSB_PIPE_INFORMATION PipeInformation
-);
-typedef BOOL (WINAPI *WinUsb_ReadPipe_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID,
-	PUCHAR Buffer,
-	ULONG BufferLength,
-	PULONG LengthTransferred,
-	LPOVERLAPPED Overlapped
-);
-typedef BOOL (WINAPI *WinUsb_ResetPipe_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID
-);
-typedef BOOL (WINAPI *WinUsb_SetCurrentAlternateSetting_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR AlternateSetting
-);
-typedef BOOL (WINAPI *WinUsb_SetPipePolicy_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID,
-	ULONG PolicyType,
-	ULONG ValueLength,
-	PVOID Value
-);
-typedef BOOL (WINAPI *WinUsb_SetPowerPolicy_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	ULONG PolicyType,
-	ULONG ValueLength,
-	PVOID Value
-);
-typedef BOOL (WINAPI *WinUsb_WritePipe_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle,
-	UCHAR PipeID,
-	PUCHAR Buffer,
-	ULONG BufferLength,
-	PULONG LengthTransferred,
-	LPOVERLAPPED Overlapped
-);
-typedef BOOL (WINAPI *WinUsb_ResetDevice_t)(
-	WINUSB_INTERFACE_HANDLE InterfaceHandle
-);
-
-/* /!\ These must match the ones from the official libusbk.h */
-typedef enum _KUSB_FNID
-{
-	KUSB_FNID_Init,
-	KUSB_FNID_Free,
-	KUSB_FNID_ClaimInterface,
-	KUSB_FNID_ReleaseInterface,
-	KUSB_FNID_SetAltInterface,
-	KUSB_FNID_GetAltInterface,
-	KUSB_FNID_GetDescriptor,
-	KUSB_FNID_ControlTransfer,
-	KUSB_FNID_SetPowerPolicy,
-	KUSB_FNID_GetPowerPolicy,
-	KUSB_FNID_SetConfiguration,
-	KUSB_FNID_GetConfiguration,
-	KUSB_FNID_ResetDevice,
-	KUSB_FNID_Initialize,
-	KUSB_FNID_SelectInterface,
-	KUSB_FNID_GetAssociatedInterface,
-	KUSB_FNID_Clone,
-	KUSB_FNID_QueryInterfaceSettings,
-	KUSB_FNID_QueryDeviceInformation,
-	KUSB_FNID_SetCurrentAlternateSetting,
-	KUSB_FNID_GetCurrentAlternateSetting,
-	KUSB_FNID_QueryPipe,
-	KUSB_FNID_SetPipePolicy,
-	KUSB_FNID_GetPipePolicy,
-	KUSB_FNID_ReadPipe,
-	KUSB_FNID_WritePipe,
-	KUSB_FNID_ResetPipe,
-	KUSB_FNID_AbortPipe,
-	KUSB_FNID_FlushPipe,
-	KUSB_FNID_IsoReadPipe,
-	KUSB_FNID_IsoWritePipe,
-	KUSB_FNID_GetCurrentFrameNumber,
-	KUSB_FNID_GetOverlappedResult,
-	KUSB_FNID_GetProperty,
-	KUSB_FNID_COUNT,
-} KUSB_FNID; 
-
-typedef struct _KLIB_VERSION {
-	INT Major;
-	INT Minor;
-	INT Micro;
-	INT Nano;
-} KLIB_VERSION;
-typedef KLIB_VERSION* PKLIB_VERSION;
-
-typedef BOOL (WINAPI *LibK_GetProcAddress_t)(
-	PVOID* ProcAddress,
-	ULONG DriverID,
-	ULONG FunctionID
-);
-
-typedef VOID (WINAPI *LibK_GetVersion_t)(
-	PKLIB_VERSION Version
-);
-
-struct winusb_interface {
-	bool initialized;
-	WinUsb_AbortPipe_t AbortPipe;
-	WinUsb_ControlTransfer_t ControlTransfer;
-	WinUsb_FlushPipe_t FlushPipe;
-	WinUsb_Free_t Free;
-	WinUsb_GetAssociatedInterface_t GetAssociatedInterface;
-	WinUsb_GetCurrentAlternateSetting_t GetCurrentAlternateSetting;
-	WinUsb_GetDescriptor_t GetDescriptor;
-	WinUsb_GetOverlappedResult_t GetOverlappedResult;
-	WinUsb_GetPipePolicy_t GetPipePolicy;
-	WinUsb_GetPowerPolicy_t GetPowerPolicy;
-	WinUsb_Initialize_t Initialize;
-	WinUsb_QueryDeviceInformation_t QueryDeviceInformation;
-	WinUsb_QueryInterfaceSettings_t QueryInterfaceSettings;
-	WinUsb_QueryPipe_t QueryPipe;
-	WinUsb_ReadPipe_t ReadPipe;
-	WinUsb_ResetPipe_t ResetPipe;
-	WinUsb_SetCurrentAlternateSetting_t SetCurrentAlternateSetting;
-	WinUsb_SetPipePolicy_t SetPipePolicy;
-	WinUsb_SetPowerPolicy_t SetPowerPolicy;
-	WinUsb_WritePipe_t WritePipe;
-	WinUsb_ResetDevice_t ResetDevice;
-};
-
-/* hid.dll interface */
-
-#define HIDP_STATUS_SUCCESS  0x110000
-typedef void* PHIDP_PREPARSED_DATA;
-
-#pragma pack(1)
-typedef struct {
-	ULONG Size;
-	USHORT VendorID;
-	USHORT ProductID;
-	USHORT VersionNumber;
-} HIDD_ATTRIBUTES, *PHIDD_ATTRIBUTES;
-#pragma pack()
-
-typedef USHORT USAGE;
-typedef struct {
-  USAGE Usage;
-  USAGE UsagePage;
-  USHORT InputReportByteLength;
-  USHORT OutputReportByteLength;
-  USHORT FeatureReportByteLength;
-  USHORT Reserved[17];
-  USHORT NumberLinkCollectionNodes;
-  USHORT NumberInputButtonCaps;
-  USHORT NumberInputValueCaps;
-  USHORT NumberInputDataIndices;
-  USHORT NumberOutputButtonCaps;
-  USHORT NumberOutputValueCaps;
-  USHORT NumberOutputDataIndices;
-  USHORT NumberFeatureButtonCaps;
-  USHORT NumberFeatureValueCaps;
-  USHORT NumberFeatureDataIndices;
-} HIDP_CAPS, *PHIDP_CAPS;
-
-typedef enum _HIDP_REPORT_TYPE {
-  HidP_Input,
-  HidP_Output,
-  HidP_Feature
-} HIDP_REPORT_TYPE;
-
-typedef struct _HIDP_VALUE_CAPS {
-  USAGE  UsagePage;
-  UCHAR  ReportID;
-  BOOLEAN  IsAlias;
-  USHORT  BitField;
-  USHORT  LinkCollection;
-  USAGE  LinkUsage;
-  USAGE  LinkUsagePage;
-  BOOLEAN  IsRange;
-  BOOLEAN  IsStringRange;
-  BOOLEAN  IsDesignatorRange;
-  BOOLEAN  IsAbsolute;
-  BOOLEAN  HasNull;
-  UCHAR  Reserved;
-  USHORT  BitSize;
-  USHORT  ReportCount;
-  USHORT  Reserved2[5];
-  ULONG  UnitsExp;
-  ULONG  Units;
-  LONG  LogicalMin, LogicalMax;
-  LONG  PhysicalMin, PhysicalMax;
-	union {
-	  struct {
-		USAGE  UsageMin, UsageMax;
-		USHORT  StringMin, StringMax;
-		USHORT  DesignatorMin, DesignatorMax;
-		USHORT  DataIndexMin, DataIndexMax;
-	  } Range;
-	  struct {
-		USAGE  Usage, Reserved1;
-		USHORT  StringIndex, Reserved2;
-		USHORT  DesignatorIndex, Reserved3;
-		USHORT  DataIndex, Reserved4;
-	  } NotRange;
-	} u;
-} HIDP_VALUE_CAPS, *PHIDP_VALUE_CAPS;
-
-DLL_DECLARE(WINAPI, BOOL, HidD_GetAttributes, (HANDLE, PHIDD_ATTRIBUTES));
-DLL_DECLARE(WINAPI, VOID, HidD_GetHidGuid, (LPGUID));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetPreparsedData, (HANDLE, PHIDP_PREPARSED_DATA *));
-DLL_DECLARE(WINAPI, BOOL, HidD_FreePreparsedData, (PHIDP_PREPARSED_DATA));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetManufacturerString, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetProductString, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetSerialNumberString, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, LONG, HidP_GetCaps, (PHIDP_PREPARSED_DATA, PHIDP_CAPS));
-DLL_DECLARE(WINAPI, BOOL, HidD_SetNumInputBuffers, (HANDLE, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_SetFeature, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetFeature, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetPhysicalDescriptor, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_GetInputReport, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_SetOutputReport, (HANDLE, PVOID, ULONG));
-DLL_DECLARE(WINAPI, BOOL, HidD_FlushQueue, (HANDLE));
-DLL_DECLARE(WINAPI, BOOL, HidP_GetValueCaps, (HIDP_REPORT_TYPE, PHIDP_VALUE_CAPS, PULONG, PHIDP_PREPARSED_DATA));
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/strerror.c b/src/3rd_party-static/libusbx-1.0.16/libusb/strerror.c
deleted file mode 100644
index a3c3afa3fc..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/strerror.c
+++ /dev/null
@@ -1,184 +0,0 @@
-/*
- * libusb strerror code
- * Copyright © 2013 Hans de Goede <hdegoede@redhat.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#include "config.h"
-
-#include <locale.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-
-#if defined(_MSC_VER)
-#define strncasecmp _strnicmp
-#endif
-
-static size_t usbi_locale = 0;
-
-/** \ingroup misc
- * How to add a new \ref libusb_strerror() translation:
- * <ol>
- * <li> Download the latest \c strerror.c from:<br>
- *      https://raw.github.com/libusbx/libusbx/master/libusb/sterror.c </li>
- * <li> Open the file in an UTF-8 capable editor </li>
- * <li> Add the 2 letter <a href="http://en.wikipedia.org/wiki/List_of_ISO_639-1_codes">ISO 639-1</a>
- *      code for your locale at the end of \c usbi_locale_supported[]<br>
- *    Eg. for Chinese, you would add "zh" so that:
- *    \code... usbi_locale_supported[] = { "en", "nl", "fr" };\endcode
- *    becomes:
- *    \code... usbi_locale_supported[] = { "en", "nl", "fr", "zh" };\endcode </li>
- * <li> Copy the <tt>{ / * English (en) * / ... }</tt> section and add it at the end of \c usbi_localized_errors<br>
- *    Eg. for Chinese, the last section of \c usbi_localized_errors could look like:
- *    \code
- *     }, { / * Chinese (zh) * /
- *         "Success",
- *         ...
- *         "Other error",
- *     }
- * };\endcode </li>
- * <li> Translate each of the English messages from the section you copied into your language </li>
- * <li> Save the file (in UTF-8 format) and send it to \c libusbx-devel@lists.sourceforge.net </li>
- * </ol>
- */
-
-static const char* usbi_locale_supported[] = { "en", "nl", "fr" };
-static const char* usbi_localized_errors[ARRAYSIZE(usbi_locale_supported)][LIBUSB_ERROR_COUNT] = {
-	{ /* English (en) */
-		"Success",
-		"Input/Output Error",
-		"Invalid parameter",
-		"Access denied (insufficient permissions)",
-		"No such device (it may have been disconnected)",
-		"Entity not found",
-		"Resource busy",
-		"Operation timed out",
-		"Overflow",
-		"Pipe error",
-		"System call interrupted (perhaps due to signal)",
-		"Insufficient memory",
-		"Operation not supported or unimplemented on this platform",
-		"Other error",
-	}, { /* Dutch (nl) */
-		"Gelukt",
-		"Invoer-/uitvoerfout",
-		"Ongeldig argument",
-		"Toegang geweigerd (onvoldoende toegangsrechten)",
-		"Apparaat bestaat niet (verbinding met apparaat verbroken?)",
-		"Niet gevonden",
-		"Apparaat of hulpbron is bezig",
-		"Bewerking verlopen",
-		"Waarde is te groot",
-		"Gebroken pijp",
-		"Onderbroken systeemaanroep",
-		"Onvoldoende geheugen beschikbaar",
-		"Bewerking wordt niet ondersteund",
-		"Andere fout",
-	}, { /* French (fr) */
-		"Succès",
-		"Erreur d'entrée/sortie",
-		"Paramètre invalide",
-		"Accès refusé (permissions insuffisantes)",
-		"Périphérique introuvable (peut-être déconnecté)",
-		"Elément introuvable",
-		"Resource déjà occupée",
-		"Operation expirée",
-		"Débordement",
-		"Erreur de pipe",
-		"Appel système abandonné (peut-être à cause d’un signal)",
-		"Mémoire insuffisante",
-		"Opération non supportée or non implémentée sur cette plateforme",
-		"Autre erreur"
-	}
-};
-
-/** \ingroup misc
- * Set the language, and only the language, not the encoding! used for
- * translatable libusb messages.
- *
- * This takes a locale string in the default setlocale format: lang[-region]
- * or lang[_country_region][.codeset]. Only the lang part of the string is
- * used, and only 2 letter ISO 639-1 codes are accepted for it, such as "de".
- * The optional region, country_region or codeset parts are ignored. This
- * means that functions which return translatable strings will NOT honor the
- * specified encoding. 
- * All strings returned are encoded as UTF-8 strings.
- *
- * If libusb_setlocale() is not called, all messages will be in English.
- *
- * The following functions return translatable strings: libusb_strerror().
- * Note that the libusb log messages controlled through libusb_set_debug()
- * are not translated, they are always in English.
- *
- * For POSIX UTF-8 environments if you want libusb to follow the standard
- * locale settings, call libusb_setlocale(setlocale(LC_MESSAGES, NULL)),
- * after your app has done its locale setup.
- *
- * \param locale locale-string in the form of lang[_country_region][.codeset]
- * or lang[-region], where lang is a 2 letter ISO 639-1 code
- * \returns LIBUSB_SUCCESS on success
- * \returns LIBUSB_ERROR_INVALID_PARAM if the locale doesn't meet the requirements
- * \returns LIBUSB_ERROR_NOT_FOUND if the requested language is not supported
- * \returns a LIBUSB_ERROR code on other errors
- */
-
-int API_EXPORTED libusb_setlocale(const char *locale)
-{
-	size_t i;
-
-	if ( (locale == NULL) || (strlen(locale) < 2)
-	  || ((strlen(locale) > 2) && (locale[2] != '-') && (locale[2] != '_') && (locale[2] != '.')) )
-		return LIBUSB_ERROR_INVALID_PARAM;
-
-	for (i=0; i<ARRAYSIZE(usbi_locale_supported); i++) {
-		if (strncasecmp(usbi_locale_supported[i], locale, 2) == 0)
-			break;
-	}
-	if (i >= ARRAYSIZE(usbi_locale_supported)) {
-		return LIBUSB_ERROR_NOT_FOUND;
-	}
-
-	usbi_locale = i;
-
-	return LIBUSB_SUCCESS;
-}
-
-/** \ingroup misc
- * Returns a constant string with a short description of the given error code,
- * this description is intended for displaying to the end user and will be in
- * the language set by libusb_setlocale().
- *
- * The returned string is encoded in UTF-8.
- *
- * The messages always start with a capital letter and end without any dot.
- * The caller must not free() the returned string.
- *
- * \param errcode the error code whose description is desired
- * \returns a short description of the error code in UTF-8 encoding
- */
-DEFAULT_VISIBILITY const char* LIBUSB_CALL libusb_strerror(enum libusb_error errcode)
-{
-	int errcode_index = -errcode;
-
-	if ((errcode_index < 0) || (errcode_index >= LIBUSB_ERROR_COUNT)) {
-		/* "Other Error", which should always be our last message, is returned */
-		errcode_index = LIBUSB_ERROR_COUNT - 1;
-	}
-
-	return usbi_localized_errors[usbi_locale][errcode_index];
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/sync.c b/src/3rd_party-static/libusbx-1.0.16/libusb/sync.c
deleted file mode 100644
index 42e486db39..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/sync.c
+++ /dev/null
@@ -1,307 +0,0 @@
-/*
- * Synchronous I/O functions for libusbx
- * Copyright © 2007-2008 Daniel Drake <dsd@gentoo.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-#include <errno.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "libusbi.h"
-
-/**
- * @defgroup syncio Synchronous device I/O
- *
- * This page documents libusbx's synchronous (blocking) API for USB device I/O.
- * This interface is easy to use but has some limitations. More advanced users
- * may wish to consider using the \ref asyncio "asynchronous I/O API" instead.
- */
-
-static void LIBUSB_CALL sync_transfer_cb(struct libusb_transfer *transfer)
-{
-	int *completed = transfer->user_data;
-	*completed = 1;
-	usbi_dbg("actual_length=%d", transfer->actual_length);
-	/* caller interprets result and frees transfer */
-}
-
-static void sync_transfer_wait_for_completion(struct libusb_transfer *transfer)
-{
-	int r, *completed = transfer->user_data;
-	struct libusb_context *ctx = HANDLE_CTX(transfer->dev_handle);
-
-	while (!*completed) {
-		r = libusb_handle_events_completed(ctx, completed);
-		if (r < 0) {
-			if (r == LIBUSB_ERROR_INTERRUPTED)
-				continue;
-			usbi_err(ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
-				 libusb_error_name(r));
-			libusb_cancel_transfer(transfer);
-			continue;
-		}
-	}
-}
-
-/** \ingroup syncio
- * Perform a USB control transfer.
- *
- * The direction of the transfer is inferred from the bmRequestType field of
- * the setup packet.
- *
- * The wValue, wIndex and wLength fields values should be given in host-endian
- * byte order.
- *
- * \param dev_handle a handle for the device to communicate with
- * \param bmRequestType the request type field for the setup packet
- * \param bRequest the request field for the setup packet
- * \param wValue the value field for the setup packet
- * \param wIndex the index field for the setup packet
- * \param data a suitably-sized data buffer for either input or output
- * (depending on direction bits within bmRequestType)
- * \param wLength the length field for the setup packet. The data buffer should
- * be at least this size.
- * \param timeout timeout (in millseconds) that this function should wait
- * before giving up due to no response being received. For an unlimited
- * timeout, use value 0.
- * \returns on success, the number of bytes actually transferred
- * \returns LIBUSB_ERROR_TIMEOUT if the transfer timed out
- * \returns LIBUSB_ERROR_PIPE if the control request was not supported by the
- * device
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failures
- */
-int API_EXPORTED libusb_control_transfer(libusb_device_handle *dev_handle,
-	uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
-	unsigned char *data, uint16_t wLength, unsigned int timeout)
-{
-	struct libusb_transfer *transfer = libusb_alloc_transfer(0);
-	unsigned char *buffer;
-	int completed = 0;
-	int r;
-
-	if (!transfer)
-		return LIBUSB_ERROR_NO_MEM;
-
-	buffer = (unsigned char*) malloc(LIBUSB_CONTROL_SETUP_SIZE + wLength);
-	if (!buffer) {
-		libusb_free_transfer(transfer);
-		return LIBUSB_ERROR_NO_MEM;
-	}
-
-	libusb_fill_control_setup(buffer, bmRequestType, bRequest, wValue, wIndex,
-		wLength);
-	if ((bmRequestType & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_OUT)
-		memcpy(buffer + LIBUSB_CONTROL_SETUP_SIZE, data, wLength);
-
-	libusb_fill_control_transfer(transfer, dev_handle, buffer,
-		sync_transfer_cb, &completed, timeout);
-	transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;
-	r = libusb_submit_transfer(transfer);
-	if (r < 0) {
-		libusb_free_transfer(transfer);
-		return r;
-	}
-
-	sync_transfer_wait_for_completion(transfer);
-
-	if ((bmRequestType & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_IN)
-		memcpy(data, libusb_control_transfer_get_data(transfer),
-			transfer->actual_length);
-
-	switch (transfer->status) {
-	case LIBUSB_TRANSFER_COMPLETED:
-		r = transfer->actual_length;
-		break;
-	case LIBUSB_TRANSFER_TIMED_OUT:
-		r = LIBUSB_ERROR_TIMEOUT;
-		break;
-	case LIBUSB_TRANSFER_STALL:
-		r = LIBUSB_ERROR_PIPE;
-		break;
-	case LIBUSB_TRANSFER_NO_DEVICE:
-		r = LIBUSB_ERROR_NO_DEVICE;
-		break;
-	case LIBUSB_TRANSFER_OVERFLOW:
-		r = LIBUSB_ERROR_OVERFLOW;
-		break;
-	case LIBUSB_TRANSFER_ERROR:
-	case LIBUSB_TRANSFER_CANCELLED:
-		r = LIBUSB_ERROR_IO;
-		break;
-	default:
-		usbi_warn(HANDLE_CTX(dev_handle),
-			"unrecognised status code %d", transfer->status);
-		r = LIBUSB_ERROR_OTHER;
-	}
-
-	libusb_free_transfer(transfer);
-	return r;
-}
-
-static int do_sync_bulk_transfer(struct libusb_device_handle *dev_handle,
-	unsigned char endpoint, unsigned char *buffer, int length,
-	int *transferred, unsigned int timeout, unsigned char type)
-{
-	struct libusb_transfer *transfer = libusb_alloc_transfer(0);
-	int completed = 0;
-	int r;
-
-	if (!transfer)
-		return LIBUSB_ERROR_NO_MEM;
-
-	libusb_fill_bulk_transfer(transfer, dev_handle, endpoint, buffer, length,
-		sync_transfer_cb, &completed, timeout);
-	transfer->type = type;
-
-	r = libusb_submit_transfer(transfer);
-	if (r < 0) {
-		libusb_free_transfer(transfer);
-		return r;
-	}
-
-	sync_transfer_wait_for_completion(transfer);
-
-	*transferred = transfer->actual_length;
-	switch (transfer->status) {
-	case LIBUSB_TRANSFER_COMPLETED:
-		r = 0;
-		break;
-	case LIBUSB_TRANSFER_TIMED_OUT:
-		r = LIBUSB_ERROR_TIMEOUT;
-		break;
-	case LIBUSB_TRANSFER_STALL:
-		r = LIBUSB_ERROR_PIPE;
-		break;
-	case LIBUSB_TRANSFER_OVERFLOW:
-		r = LIBUSB_ERROR_OVERFLOW;
-		break;
-	case LIBUSB_TRANSFER_NO_DEVICE:
-		r = LIBUSB_ERROR_NO_DEVICE;
-		break;
-	case LIBUSB_TRANSFER_ERROR:
-	case LIBUSB_TRANSFER_CANCELLED:
-		r = LIBUSB_ERROR_IO;
-		break;
-	default:
-		usbi_warn(HANDLE_CTX(dev_handle),
-			"unrecognised status code %d", transfer->status);
-		r = LIBUSB_ERROR_OTHER;
-	}
-
-	libusb_free_transfer(transfer);
-	return r;
-}
-
-/** \ingroup syncio
- * Perform a USB bulk transfer. The direction of the transfer is inferred from
- * the direction bits of the endpoint address.
- *
- * For bulk reads, the <tt>length</tt> field indicates the maximum length of
- * data you are expecting to receive. If less data arrives than expected,
- * this function will return that data, so be sure to check the
- * <tt>transferred</tt> output parameter.
- *
- * You should also check the <tt>transferred</tt> parameter for bulk writes.
- * Not all of the data may have been written.
- *
- * Also check <tt>transferred</tt> when dealing with a timeout error code.
- * libusbx may have to split your transfer into a number of chunks to satisfy
- * underlying O/S requirements, meaning that the timeout may expire after
- * the first few chunks have completed. libusbx is careful not to lose any data
- * that may have been transferred; do not assume that timeout conditions
- * indicate a complete lack of I/O.
- *
- * \param dev_handle a handle for the device to communicate with
- * \param endpoint the address of a valid endpoint to communicate with
- * \param data a suitably-sized data buffer for either input or output
- * (depending on endpoint)
- * \param length for bulk writes, the number of bytes from data to be sent. for
- * bulk reads, the maximum number of bytes to receive into the data buffer.
- * \param transferred output location for the number of bytes actually
- * transferred.
- * \param timeout timeout (in millseconds) that this function should wait
- * before giving up due to no response being received. For an unlimited
- * timeout, use value 0.
- *
- * \returns 0 on success (and populates <tt>transferred</tt>)
- * \returns LIBUSB_ERROR_TIMEOUT if the transfer timed out (and populates
- * <tt>transferred</tt>)
- * \returns LIBUSB_ERROR_PIPE if the endpoint halted
- * \returns LIBUSB_ERROR_OVERFLOW if the device offered more data, see
- * \ref packetoverflow
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other failures
- */
-int API_EXPORTED libusb_bulk_transfer(struct libusb_device_handle *dev_handle,
-	unsigned char endpoint, unsigned char *data, int length, int *transferred,
-	unsigned int timeout)
-{
-	return do_sync_bulk_transfer(dev_handle, endpoint, data, length,
-		transferred, timeout, LIBUSB_TRANSFER_TYPE_BULK);
-}
-
-/** \ingroup syncio
- * Perform a USB interrupt transfer. The direction of the transfer is inferred
- * from the direction bits of the endpoint address.
- *
- * For interrupt reads, the <tt>length</tt> field indicates the maximum length
- * of data you are expecting to receive. If less data arrives than expected,
- * this function will return that data, so be sure to check the
- * <tt>transferred</tt> output parameter.
- *
- * You should also check the <tt>transferred</tt> parameter for interrupt
- * writes. Not all of the data may have been written.
- *
- * Also check <tt>transferred</tt> when dealing with a timeout error code.
- * libusbx may have to split your transfer into a number of chunks to satisfy
- * underlying O/S requirements, meaning that the timeout may expire after
- * the first few chunks have completed. libusbx is careful not to lose any data
- * that may have been transferred; do not assume that timeout conditions
- * indicate a complete lack of I/O.
- *
- * The default endpoint bInterval value is used as the polling interval.
- *
- * \param dev_handle a handle for the device to communicate with
- * \param endpoint the address of a valid endpoint to communicate with
- * \param data a suitably-sized data buffer for either input or output
- * (depending on endpoint)
- * \param length for bulk writes, the number of bytes from data to be sent. for
- * bulk reads, the maximum number of bytes to receive into the data buffer.
- * \param transferred output location for the number of bytes actually
- * transferred.
- * \param timeout timeout (in millseconds) that this function should wait
- * before giving up due to no response being received. For an unlimited
- * timeout, use value 0.
- *
- * \returns 0 on success (and populates <tt>transferred</tt>)
- * \returns LIBUSB_ERROR_TIMEOUT if the transfer timed out
- * \returns LIBUSB_ERROR_PIPE if the endpoint halted
- * \returns LIBUSB_ERROR_OVERFLOW if the device offered more data, see
- * \ref packetoverflow
- * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
- * \returns another LIBUSB_ERROR code on other error
- */
-int API_EXPORTED libusb_interrupt_transfer(
-	struct libusb_device_handle *dev_handle, unsigned char endpoint,
-	unsigned char *data, int length, int *transferred, unsigned int timeout)
-{
-	return do_sync_bulk_transfer(dev_handle, endpoint, data, length,
-		transferred, timeout, LIBUSB_TRANSFER_TYPE_INTERRUPT);
-}
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/version.h b/src/3rd_party-static/libusbx-1.0.16/libusb/version.h
deleted file mode 100644
index cf37de97a5..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/version.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* This file is parsed by m4 and windres and RC.EXE so please keep it simple. */
-#include "version_nano.h"
-#ifndef LIBUSB_MAJOR
-#define LIBUSB_MAJOR 1
-#endif
-#ifndef LIBUSB_MINOR
-#define LIBUSB_MINOR 0
-#endif
-#ifndef LIBUSB_MICRO
-#define LIBUSB_MICRO 16
-#endif
-#ifndef LIBUSB_NANO
-#define LIBUSB_NANO 0
-#endif
-/* LIBUSB_RC is the release candidate suffix. Should normally be empty. */
-#ifndef LIBUSB_RC
-#define LIBUSB_RC ""
-#endif
diff --git a/src/3rd_party-static/libusbx-1.0.16/libusb/version_nano.h b/src/3rd_party-static/libusbx-1.0.16/libusb/version_nano.h
deleted file mode 100644
index 525cd7d52d..0000000000
--- a/src/3rd_party-static/libusbx-1.0.16/libusb/version_nano.h
+++ /dev/null
@@ -1 +0,0 @@
-#define LIBUSB_NANO 10774
diff --git a/src/appMain/CMakeLists.txt b/src/appMain/CMakeLists.txt
index 88c2d75dad..24d97f5597 100644
--- a/src/appMain/CMakeLists.txt
+++ b/src/appMain/CMakeLists.txt
@@ -85,7 +85,6 @@ cmake_policy(PUSH)
 # make link_directories() treat paths relative to the source dir
 # info: cmake --help-policy CMP0015
 cmake_policy(SET CMP0015 NEW)
-link_directories(${LIBUSB_LIBS_DIRECTORY})
 cmake_policy(POP)
 
 if (TELEMETRY_MONITOR)
@@ -137,7 +136,7 @@ endif()
 
 if (BUILD_USB_SUPPORT)
   if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    list(APPEND LIBRARIES Libusb-1.0.16)
+    list(APPEND LIBRARIES libusb-1.0.so)
   endif()
 endif()
 
diff --git a/src/components/telemetry_monitor/test/CMakeLists.txt b/src/components/telemetry_monitor/test/CMakeLists.txt
index d72b89f0e1..960985e45c 100644
--- a/src/components/telemetry_monitor/test/CMakeLists.txt
+++ b/src/components/telemetry_monitor/test/CMakeLists.txt
@@ -65,7 +65,7 @@ set(LIBRARIES
 )
 
 if (BUILD_USB_SUPPORT)
-  list(APPEND LIBRARIES Libusb-1.0.16)
+  list(APPEND LIBRARIES libusb-1.0.so)
 endif()
 
 if (BUILD_BT_SUPPORT)
diff --git a/src/components/transport_manager/CMakeLists.txt b/src/components/transport_manager/CMakeLists.txt
index 8c7980a96a..e738bbaeb7 100644
--- a/src/components/transport_manager/CMakeLists.txt
+++ b/src/components/transport_manager/CMakeLists.txt
@@ -40,7 +40,6 @@ include_directories (
   ${COMPONENTS_DIR}/resumption/include
   ${POLICY_GLOBAL_INCLUDE_PATH}/
   ${JSONCPP_INCLUDE_DIRECTORY}
-  ${LIBUSB_INCLUDE_DIRECTORY}
   ${LOG4CXX_INCLUDE_DIRECTORY}
 )
 
@@ -73,9 +72,7 @@ if(BUILD_USB_SUPPORT)
       ${COMPONENTS_DIR}/transport_manager/include/transport_manager/usb/qnx
       ${COMPONENTS_DIR}/transport_manager/src/usb/qnx
     )
-    list(APPEND LIBRARIES
-      Libusb-1.0.16
-    )
+
   elseif(CMAKE_SYSTEM_NAME STREQUAL "QNX")
     set(EXCLUDE_PATHS
       ${COMPONENTS_DIR}/transport_manager/include/transport_manager/usb/libusb
diff --git a/src/components/transport_manager/include/transport_manager/usb/libusb/platform_usb_device.h b/src/components/transport_manager/include/transport_manager/usb/libusb/platform_usb_device.h
index 1aa6881b38..baec1938b1 100644
--- a/src/components/transport_manager/include/transport_manager/usb/libusb/platform_usb_device.h
+++ b/src/components/transport_manager/include/transport_manager/usb/libusb/platform_usb_device.h
@@ -37,7 +37,7 @@
 #define SRC_COMPONENTS_TRANSPORT_MANAGER_INCLUDE_TRANSPORT_MANAGER_USB_LIBUSB_PLATFORM_USB_DEVICE_H_
 
 #include <string>
-#include <libusb/libusb.h>
+#include <libusb-1.0/libusb.h>
 
 namespace transport_manager {
 
diff --git a/src/components/transport_manager/include/transport_manager/usb/libusb/usb_handler.h b/src/components/transport_manager/include/transport_manager/usb/libusb/usb_handler.h
index b2ebd3a977..bed631ea2e 100644
--- a/src/components/transport_manager/include/transport_manager/usb/libusb/usb_handler.h
+++ b/src/components/transport_manager/include/transport_manager/usb/libusb/usb_handler.h
@@ -36,7 +36,7 @@
 #ifndef SRC_COMPONENTS_TRANSPORT_MANAGER_INCLUDE_TRANSPORT_MANAGER_USB_LIBUSB_USB_HANDLER_H_
 #define SRC_COMPONENTS_TRANSPORT_MANAGER_INCLUDE_TRANSPORT_MANAGER_USB_LIBUSB_USB_HANDLER_H_
 
-#include <libusb/libusb.h>
+#include <libusb-1.0/libusb.h>
 
 #include "transport_manager/transport_adapter/transport_adapter.h"
 #include "transport_manager/usb/usb_control_transfer.h"
diff --git a/src/components/transport_manager/src/usb/libusb/usb_connection.cc b/src/components/transport_manager/src/usb/libusb/usb_connection.cc
index 409209b2b2..584add463d 100644
--- a/src/components/transport_manager/src/usb/libusb/usb_connection.cc
+++ b/src/components/transport_manager/src/usb/libusb/usb_connection.cc
@@ -34,7 +34,7 @@
 #include <unistd.h>
 #include <iomanip>
 
-#include <libusb/libusb.h>
+#include <libusb-1.0/libusb.h>
 
 #include <sstream>
 
diff --git a/src/components/transport_manager/test/CMakeLists.txt b/src/components/transport_manager/test/CMakeLists.txt
index 184d546f15..41aae296ac 100644
--- a/src/components/transport_manager/test/CMakeLists.txt
+++ b/src/components/transport_manager/test/CMakeLists.txt
@@ -59,7 +59,7 @@ set(LIBRARIES
 )
 
 if (BUILD_USB_SUPPORT)
-  list(APPEND LIBRARIES Libusb-1.0.16)
+  list(APPEND LIBRARIES libusb-1.0.so)
 endif()
 
 if (BUILD_BT_SUPPORT)