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/** @file
* @brief hid-dump - libusb API extensions
*
* Copyright (C) 2010 Nikolai Kondrashov
*
* This file is part of hid-dump.
*
* Hid-dump is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Hid-dump 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with hid-dump; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @author Nikolai Kondrashov <spbnick@gmail.com>
*
* @(#) $Id$
*/
#include "hid_dump/libusb.h"
#include <stdbool.h>
const char *
libusb_strerror(enum libusb_error err)
{
switch (err)
{
case LIBUSB_SUCCESS:
return "Success";
#define MAP(_name, _desc) \
case LIBUSB_ERROR_##_name: \
return _desc " (" #_name ")"
MAP(IO,
"Input/output error");
MAP(INVALID_PARAM,
"Invalid parameter");
MAP(ACCESS,
"Access denied (insufficient permissions)");
MAP(NO_DEVICE,
"No such device (it may have been disconnected)");
MAP(NOT_FOUND,
"Entity not found");
MAP(BUSY,
"Resource busy");
MAP(TIMEOUT,
"Operation timed out");
MAP(OVERFLOW,
"Overflow");
MAP(PIPE,
"Pipe error");
MAP(INTERRUPTED,
"System call interrupted (perhaps due to signal)");
MAP(NO_MEM,
"Insufficient memory");
MAP(NOT_SUPPORTED,
"Operation not supported or unimplemented on this platform");
MAP(OTHER, "Other error");
#undef MAP
default:
return "Unknown error code";
}
}
enum libusb_error
libusb_open_device_with_bus_dev(libusb_context *ctx,
uint8_t bus_num,
uint8_t dev_addr,
libusb_device_handle **phandle)
{
enum libusb_error err = LIBUSB_ERROR_OTHER;
libusb_device **list = NULL;
ssize_t num;
ssize_t idx;
libusb_device *dev;
libusb_device_handle *handle = NULL;
/* Retrieve device list */
num = libusb_get_device_list(ctx, &list);
if (num == LIBUSB_ERROR_NO_MEM)
{
err = num;
goto cleanup;
}
/* Find and open the device */
for (idx = 0; idx < num; idx++)
{
dev = list[idx];
if (libusb_get_bus_number(dev) == bus_num &&
libusb_get_device_address(dev) == dev_addr)
{
err = libusb_open(dev, &handle);
if (err != LIBUSB_SUCCESS)
goto cleanup;
break;
}
}
/* Free the device list freeing unused devices */
libusb_free_device_list(list, true);
list = NULL;
/* Check if the device is found */
if (handle == NULL)
{
err = LIBUSB_ERROR_NO_DEVICE;
goto cleanup;
}
/* Output the device handle */
if (phandle != NULL)
{
*phandle = handle;
handle = NULL;
}
err = LIBUSB_SUCCESS;
cleanup:
/* Free the device */
if (handle != NULL)
libusb_close(handle);
/* Free device list along with devices */
if (list != NULL)
libusb_free_device_list(list, true);
return err;
}
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