[Errno 16] Resource busy

Hi guys, I’m not sure if i made a mistake… I’m always getting this error and no solution worked for me 😦 My software: Python 2.7.8, libusb 1.0.19-1 and the current PyUSB version from this rep… I’m working on Arch Linux Arm (Raspberry Pi model B) Her’s my udev rule:

UBSYSTEMS=="usb", ATTRS{idVendor}=="04f2", ATTRS{idProduct}=="0402", GROUP=users", MODE="0660"

From https://github.com/itdaniher/WeDoMore/issues/4

And a testcode:

#!/usr/bin/python2

import usb.core
import usb.util
import sys

def getData():
    VENDOR_ID = 0x04f2
    PRODUCT_ID = 0x0402
    DATA_SIZE = 1
    device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
    if device is None:
        sys.exit("Could not find Keyboard")

    if device.is_kernel_driver_active(0):
        try:
                device.detach_kernel_driver(0)
                print "kernel driver detached"
        except usb.core.USBError as e:
                sys.exit("Could not detach kernel driver: %s" % str(e))
    else:
        print "no kernel driver attached"
    try:
        usb.util.claim_interface(device, 0)
        print "claimed device"
    except:
        sys.exit("Could not claim the device: %s" % str(e))
    try:
        device.set_configuration()
        device.reset()
    except usb.core.USBError as e:
        sys.exit("Could not set configuration: %s" % str(e))

When I execute my script:

$sudo python2 ./test.py
no kernel driver attached
claimed device
Could not set configuration: [Errno 16] Resource busy

Can you tell me whats wrong? Thanks 😃

[Sam-Hall]

This should cure most “Resource busy” issues for newbies…

for cfg in device:
  for intf in cfg:
    if device.is_kernel_driver_active(intf.bInterfaceNumber):
      try:
        device.detach_kernel_driver(intf.bInterfaceNumber)
      except usb.core.USBError as e:
        sys.exit("Could not detatch kernel driver from interface({0}): {1}".format(intf.bInterfaceNumber, str(e)))

[walac]

@Aswin21 You need to detach the kernel driver before issuing a set_configuration.