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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
*
* Copyright (C) 2010 Richard Hughes <richard@hughsie.com>
* Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
*
* SPDX-License-Identifier: LGPL-2.1+
*/
/**
* SECTION:gusb-source
* @short_description: GSource integration for libusb
*
* This object can be used to integrate libusb into the GLib main loop.
*/
#include "config.h"
#include <libusb-1.0/libusb.h>
#include <stdlib.h>
#include "gusb-context-private.h"
#include "gusb-context.h"
#include "gusb-source-private.h"
#include "gusb-source.h"
#include "gusb-util.h"
/* the <poll.h> header is not available on all platforms */
#ifndef POLLIN
#define POLLIN 0x0001
#define POLLOUT 0x0004
#endif
/**
* g_usb_source_error_quark:
*
* Return value: Our personal error quark.
*
* Since: 0.1.0
**/
GQuark
g_usb_source_error_quark(void)
{
static GQuark quark = 0;
if (!quark)
quark = g_quark_from_static_string("g_usb_source_error");
return quark;
}
struct _GUsbSource {
GSource source;
GSList *pollfds;
libusb_context *ctx;
};
static void
g_usb_source_pollfd_add(GUsbSource *self, int fd, short events)
{
GPollFD *pollfd = g_new0(GPollFD, 1);
pollfd->fd = fd;
pollfd->events = 0;
pollfd->revents = 0;
if (events & POLLIN)
pollfd->events |= G_IO_IN;
if (events & POLLOUT)
pollfd->events |= G_IO_OUT;
self->pollfds = g_slist_prepend(self->pollfds, pollfd);
g_source_add_poll((GSource *)self, pollfd);
}
static void
g_usb_source_pollfd_added_cb(int fd, short events, void *user_data)
{
GUsbSource *self = user_data;
g_usb_source_pollfd_add(self, fd, events);
}
static void
g_usb_source_pollfd_removed_cb(int fd, void *user_data)
{
GUsbSource *self = user_data;
/* find the pollfd in the list */
for (GSList *elem = self->pollfds; elem != NULL; elem = elem->next) {
GPollFD *pollfd = elem->data;
if (pollfd->fd == fd) {
g_source_remove_poll((GSource *)self, pollfd);
g_free(pollfd);
self->pollfds = g_slist_delete_link(self->pollfds, elem);
return;
}
}
g_warning("couldn't find fd %d in list", fd);
}
static gboolean
g_usb_source_prepare(GSource *source, gint *timeout)
{
GUsbSource *self = (GUsbSource *)source;
/* before the poll */
libusb_lock_events(self->ctx);
/* release the lock at least once per minute */
*timeout = 60000;
return FALSE;
}
static gboolean
g_usb_source_check(GSource *source)
{
GUsbSource *self = (GUsbSource *)source;
for (GSList *elem = self->pollfds; elem != NULL; elem = elem->next) {
GPollFD *pollfd = elem->data;
if (pollfd->revents)
return TRUE;
}
libusb_unlock_events(self->ctx);
return FALSE;
}
static gboolean
g_usb_source_dispatch(GSource *source, GSourceFunc callback, gpointer user_data)
{
GUsbSource *self = (GUsbSource *)source;
struct timeval tv = {0, 0};
gint rc;
rc = libusb_handle_events_locked(self->ctx, &tv);
libusb_unlock_events(self->ctx);
if (rc < 0)
g_warning("failed to handle event: %s [%i]", g_usb_strerror(rc), rc);
if (callback != NULL)
callback(user_data);
return G_SOURCE_CONTINUE;
}
static void
g_usb_source_finalize(GSource *source)
{
GUsbSource *self = (GUsbSource *)source;
g_slist_free(self->pollfds);
}
static GSourceFuncs usb_source_funcs = {g_usb_source_prepare,
g_usb_source_check,
g_usb_source_dispatch,
g_usb_source_finalize};
GUsbSource *
_g_usb_source_new(GMainContext *main_ctx, GUsbContext *gusb_ctx)
{
GUsbSource *self;
const struct libusb_pollfd **pollfds;
self = (GUsbSource *)g_source_new(&usb_source_funcs, sizeof(GUsbSource));
self->pollfds = NULL;
self->ctx = _g_usb_context_get_context(gusb_ctx);
/* watch the fd's already created */
pollfds = libusb_get_pollfds(self->ctx);
for (guint i = 0; pollfds != NULL && pollfds[i] != NULL; i++)
g_usb_source_pollfd_add(self, pollfds[i]->fd, pollfds[i]->events);
free(pollfds);
/* watch for PollFD changes */
g_source_attach((GSource *)self, main_ctx);
libusb_set_pollfd_notifiers(self->ctx,
g_usb_source_pollfd_added_cb,
g_usb_source_pollfd_removed_cb,
self);
return self;
}
static void
g_usb_source_pollfd_remove_cb(gpointer data, gpointer user_data)
{
GPollFD *pollfd = (GPollFD *)data;
GSource *source = (GSource *)user_data;
g_source_remove_poll(source, pollfd);
}
void
_g_usb_source_destroy(GUsbSource *self)
{
libusb_set_pollfd_notifiers(self->ctx, NULL, NULL, NULL);
g_slist_foreach(self->pollfds, g_usb_source_pollfd_remove_cb, self);
g_slist_free_full(g_steal_pointer(&self->pollfds), g_free);
g_source_destroy((GSource *)self);
}
/**
* g_usb_source_set_callback:
* @self: a #GUsbSource
* @func: a function to call
* @data: data to pass to @func
* @notify: a #GDestroyNotify
*
* Set a callback to be called when the source is dispatched.
*
* Since: 0.1.0
**/
void
g_usb_source_set_callback(GUsbSource *self, GSourceFunc func, gpointer data, GDestroyNotify notify)
{
g_source_set_callback((GSource *)self, func, data, notify);
}
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