usbreset.c

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <fcntl.h>
   4 #include <errno.h>
   5 #include <sys/ioctl.h>
   6
   7 #include <linux/usbdevice_fs.h>
   8
   9 int main(int argc, char **argv) {
  10         int fd, err=0;
  11         if (argc != 2) {
  12                 printf("usbreset - send a port reset to an USB device\n"
  13                        "this should be equivalent to physically unplugging and replugging a device\n\n"
  14                        "usage: usbreset /dev/bus/usb/busid/deviceid\n"
  15                        "e.g.   usbreset /dev/bus/usb/002/001\n"
  16                        "(see lsusb output for bus id and device id)\n");
  17                 return 1;
  18         }
  19         if((fd = open(argv[1], O_WRONLY)) == -1) {;
  20                 perror("open");
  21                 return 1;
  22         }
  23
  24         printf("resetting USB device %s\n", argv[1]);
  25
  26         if(ioctl(fd, USBDEVFS_RESET, 0) == -1) {
  27                 perror("ioctl");
  28                 err = 1;
  29         } else printf("reset successful\n");
  30
  31         close(fd);
  32         return err;
  33 }
  34