code.delx.au - monosys/blob - usb-reset

   1 #!/usr/bin/env python2
   2
   3 import fcntl
   4 import os
   5 import subprocess
   6 import sys
   7 import time
   8
   9 if not sys.platform.startswith("linux"):
  10     print >>sys.stderr, "Sorry, this tool requires Linux"
  11     sys.exit(1)
  12
  13 try:
  14     search_usb_id = sys.argv[1].lower()
  15 except IndexError:
  16     print >>sys.stderr, "Usage: %s vendorid:devid" % sys.argv[0]
  17     print >>sys.stderr, "\nThis tool will reset all USB devices with the given ID (eg 1f4d:a803)"
  18     sys.exit(1)
  19
  20
  21 USBDEVFS_RESET = 21780
  22
  23 os.umask(0007)
  24
  25 p = subprocess.Popen(["lsusb"], stdout=subprocess.PIPE)
  26 for line in p.stdout:
  27     line = line.split()
  28     usb_id = line[5].lower()
  29     if usb_id != search_usb_id:
  30         continue
  31     bus = line[1]
  32     dev = line[3].replace(":", "")
  33
  34     filename = "/dev/bus/usb/%s/%s" % (bus, dev)
  35     print "Resetting", filename, "...",
  36     sys.stdout.flush()
  37     fd = os.open(filename, os.O_WRONLY)
  38     ret = fcntl.ioctl(fd, USBDEVFS_RESET, 0)
  39     if ret < 0:
  40         print >>sys.stderr, "\nError in ioctl:", ret
  41         sys.exit(1)
  42     os.close(fd)
  43     time.sleep(1)
  44     print "done"
  45