keyboards/jj40/tools/usb_detach.c

   1 /* Found at https://www.linuxquestions.org/questions/linux-hardware-18/how-to-unclaim-usb-device-558138/#post3406986 */
   2 #include <stdio.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <fcntl.h>
   6 #include <linux/ioctl.h>
   7 #include <linux/usbdevice_fs.h>
   8
   9 int main(int argc, char**argv)
  10 {
  11         struct usbdevfs_ioctl command;
  12         int ret;
  13         int fd;
  14         int i;
  15         if (argc>1) {
  16                 fd = open(argv[1],O_RDWR);
  17                 if (fd<1){
  18                         perror("unable to open file");
  19                         return 1;
  20                 }
  21                 for (i=0;i<255;i++){ // hack: should fetch how many interface there is.
  22                         command.ifno = i;
  23                         command.ioctl_code = USBDEVFS_DISCONNECT;
  24                         command.data = NULL;
  25                         ret = ioctl(fd, USBDEVFS_IOCTL, &command);
  26                         if(ret!=-1)
  27                                 printf("un claimed interface %d %d\n",i,ret);
  28                 }
  29         } else {
  30                 printf ("usage: %s /dev/bus/usb/BUS/DEVICE\n",argv[0]);
  31                 printf("Release all interfaces of this usb device for usage in virtualisation\n");
  32         }
  33 }