usbreset/usbreset.c

   1 /* usbreset -- send a USB port reset to a USB device */
   2
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <fcntl.h>
   6 #include <errno.h>
   7 #include <sys/ioctl.h>
   8
   9 #include <linux/usbdevice_fs.h>
  10
  11 int main(int argc, char **argv)
  12 {
  13         const char *filename;
  14         int fd;
  15         int rc;
  16
  17         if (argc != 2) {
  18                 fprintf(stderr, "Usage: usbreset device-filename\n");
  19                 return 1;
  20         }
  21         filename = argv[1];
  22
  23         fd = open(filename, O_WRONLY);
  24         if (fd < 0) {
  25                 perror("Error opening output file");
  26                 return 1;
  27         }
  28
  29         printf("Resetting USB device %s\n", filename);
  30         rc = ioctl(fd, USBDEVFS_RESET, 0);
  31         if (rc < 0) {
  32                 perror("Error in ioctl");
  33                 return 1;
  34         }
  35         printf("Reset successful\n");
  36
  37         close(fd);
  38         return 0;
  39 }