Disable and enable a specific USB device.

reset_usb_device.py

#! /usr/bin/python3
import os
import argparse
from time import sleep

PATH = '/sys/bus/usb/devices/'

def reset_device(key, value, coerce, sleep_time):
    for device_dir, dirs, files in os.walk(PATH, followlinks=True):
        if device_dir != PATH:
            dirs[:] = []
        if key in files:
            with open(os.path.join(device_dir, key), 'r') as f:
                d = coerce(f.read().strip())
                if d == value:
                    break
    else:
        print("No such device")
        return

    print('Device found at: ' + device_dir)

    if input('Sure you want to reset? (y/n): ').lower() == 'y':
        reset_file = os.path.join(device_dir, 'authorized')
        with open(reset_file, 'wb') as f:
            f.write(b'0')

        if sleep_time:
            sleep(sleep_time)

        with open(reset_file, 'wb') as f:
            f.write(b'1')


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-d', type=int, help="the device number of the device to reset (as seen in lsusb)")
    parser.add_argument('-s', type=str, help="the device serial number (as seen in v4l)")
    parser.add_argument('-t', type=float, default=0, help="the seconds to disable the device for")
    args = parser.parse_args()

    if args.d is not None:
        reset_device('devnum', args.d, int, args.t)
    elif args.s is not None:
        reset_device('serial', args.s, str, args.t)
    else:
        parser.print_help()

if __name__=='__main__':
    main()