Python script to reset a USB device on Linux

diff --git a/scripts/usbreset.py b/scripts/usbreset.py
new file mode 100755 (executable)
index 0000000..3875b39
--- /dev/null
+++ b/scripts/usbreset.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+import fcntl
+import os
+import subprocess
+import sys
+
+if not sys.platform.startswith("linux"):
+       print >>sys.stderr, "Sorry, this tool requires Linux"
+       sys.exit(1)
+
+try:
+       search_usb_id = sys.argv[1].lower()
+except IndexError:
+       print >>sys.stderr, "Usage: %s vendorid:devid" % sys.argv[0]
+       print >>sys.stderr, "\nThis tool will reset all USB devices with the given ID (eg 1f4d:a803)"
+       sys.exit(1)
+
+
+USBDEVFS_RESET = 21780
+
+p = subprocess.Popen(["lsusb"], stdout=subprocess.PIPE)
+for line in p.stdout:
+       line = line.split()
+       usb_id = line[5].lower()
+       if usb_id != search_usb_id:
+               continue
+       bus = line[1]
+       dev = line[3].replace(":", "")
+
+       filename = "/dev/bus/usb/%s/%s" % (bus, dev)
+       print "Resetting", filename, "...",
+       fd = os.open(filename, os.O_WRONLY)
+       ret = fcntl.ioctl(fd, USBDEVFS_RESET, 0)
+       if ret < 0:
+               print >>sys.stderr, "\nError in ioctl:", ret
+               sys.exit(1)
+       os.close(fd)
+       print "done"
+