device-powersave: turn on powersave mode for devices except USB HID ones

device-powersave

#!/usr/bin/python3

import os
import glob

def main():
  patterns = [
    '/sys/block/*/device/power/control',
    '/sys/bus/i2c/devices/*/device/power/control',
    '/sys/bus/pci/devices/*/power/control',
    '/sys/bus/pci/devices/*/*/power/control',
  ]

  for pattern in patterns:
    for file in glob.glob(pattern):
      make_auto(file)

  usbhid = set()
  usb_driver_pattern = '/sys/bus/usb/devices/*:*/driver'
  for file in glob.glob(usb_driver_pattern):
    target = os.readlink(file)
    driver = target.rsplit('/', 1)[1]
    if driver == 'usbhid':
      bus = file.split('/')[5].split(':', 1)[0]
      usbhid.add(bus)

  usb_pattern = '/sys/bus/usb/devices/*/power/control'
  for file in glob.glob(usb_pattern):
    bus = file.split('/')[5]
    if bus not in usbhid:
      make_auto(file)

def make_auto(control):
  with open(control, 'w') as f:
    f.write('auto\n')

if __name__ == '__main__':
  main()