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#!/bin/env python
# switch k780 logitech keyboard Fn keys
import sys
import time
import usb.core
import atexit

DEVINDEX=2 # index of the device in unifying receiver
           # 0xff for the receiver

class HIDpp:
    def __init__(self, req_type, request, value, index):
        self.__rt = req_type
        self.__r = request
        self.__v = value
        self.__i = index
        self.dev = None
        atexit.register(self.clean)

    def clean(self):
        self.dev.reset()
        if self.reattach:
            self.dev.attach_kernel_driver(self.__i)

    def set_device(self, device):
        if self.dev is not None:
            self.clean()
        self.dev = device
        cfg = dev[0]
        self.iface = cfg[(self.__i,0)]
        self.reattach = self.dev.is_kernel_driver_active(self.__i)
        if self.reattach:
            dev.detach_kernel_driver(self.__i)

    def send_short(self, subid, *args):
        """
        subid: 0-7f = reports & notifications // 80-ff = registers
        """
        report_id = 0x10 # short, 0x11 = long
        data = [report_id, DEVINDEX, subid] + list(args)
        self.dev.ctrl_transfer(self.__rt, self.__r, self.__v, self.__i, data)

    def read(self):
        return self.iface[0].read(1000, 10000)

activate = len(sys.argv) == 1

# find unifying receiver
dev = usb.core.find(idVendor=0x046d, idProduct=0xc52b)

if dev is None:
  raise ValueError('Keyboard not found')

kbd = HIDpp(0x21, 0x9, 0x0210, 2)

kbd.set_device(dev)

if activate:
    kbd.send_short(0x0c, 0x1e, 0, 0, 0)
else:
    kbd.send_short(0x0c, 0x1e, 1, 0, 0)

kbd.read()
time.sleep(1)