#!/usr/bin/python3

import usb.core
import usb.util

VENDOR_ID = 0x046d
PRODUCT_ID = 0xc640

# find the USB device
device = usb.core.find(idVendor=VENDOR_ID,
                       idProduct=PRODUCT_ID)

# use the first/default configuration
device.set_configuration()

if device is None:
    print ("device not found")

leds_on = {0x04,0x1F}
ret = device.ctrl_transfer(0x22,0x9,0x204,0x0,leds_on,0x2)
print (ret)