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usb_reset.c
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usb_reset.c
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/* (c) Valentin Dudouyt, 2013 - 2017
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* usbreset -- send a USB port reset to a USB device
* based on code by Alan Stern (http://marc.info/?l=linux-usb&m=121459435621262&w=2) */
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <libusb.h>
#include <stdlib.h>
void print_help_and_exit(char **argv) {
fprintf(stderr, "Usage: %s <vid>:<pid> [<filename>]\n", argv[0]);
exit(-1);
}
int main(int argc, char **argv)
{
const char *filename;
int fd;
int rc;
if (argc != 2)
print_help_and_exit(argv);
int result, vid, pid;
result = sscanf(argv[1], "%x:%x", &vid, &pid);
if(!result)
print_help_and_exit(argv);
libusb_init(NULL);
libusb_device_handle *handle = libusb_open_device_with_vid_pid(NULL, vid, pid);
if(!handle) {
fprintf(stderr, "Couldn't open device\n");
return 1;
}
result = libusb_reset_device(handle);
if(!handle) {
fprintf(stderr, "Couldn't reset device\n");
return 1;
}
return 0;
}