Add a script to mopdify the lighting on a Redragon K621 Horus keyboard, along with an option to turn off the lights when the monitor turns off
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#!/usr/bin/python3
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import argparse
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import atexit
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import dbus
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import dbus.mainloop.glib
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import gi.repository.GLib
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import pprint
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import sys
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import usb.core
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#import traceback
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# Redragon K621 Horus
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vendor=0x258a
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product=0x0049
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screensaver_list = [
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'org.gnome.ScreenSaver',
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'org.cinnamon.ScreenSaver',
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'org.kde.screensaver',
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'org.freedesktop.ScreenSaver'
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]
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def main():
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parser = argparse.ArgumentParser(
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description='Adjust backlight for Redgradon Horus K621',
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add_help=True,
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)
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parser.add_argument('--on', '-1', dest='switch', action='store_true',
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default=None, help='Turn keyboard backlight on')
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parser.add_argument('--off', '-0', dest='switch', action='store_false',
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default=None, help='Turn keyboard backlight off')
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parser.add_argument('--screensaver', '-s', dest='screensaver', action='store_true',
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default=None, help='Turn keyboard backlight off')
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args = parser.parse_args()
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if args.switch is None and args.screensaver is None:
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parser.print_help()
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sys.exit(1)
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if args.screensaver:
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dbus_loop = dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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session = dbus.SessionBus(mainloop=dbus_loop)
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for screensaver in screensaver_list:
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session.add_match_string_non_blocking("interface='{}'".format(screensaver))
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#session.add_match_string_non_blocking("interface='org.gnome.Mutter.IdleMonitor'")
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session.add_message_filter(message_callback)
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loop = gi.repository.GLib.MainLoop()
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loop.run()
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else:
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kbd = setup_usb()
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send_packets(kbd, args.switch)
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def message_callback(session, message):
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for screensaver in screensaver_list:
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if message.get_interface() == screensaver:
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pprint.pprint(message)
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# not supported in org.freedesktop.ScreenSaver:
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# Error org.freedesktop.DBus.Error.NotSupported: This method is not part of the idle inhibition specification: https://specifications.freedesktop.org/idle-inhibit-spec/latest/
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if message.get_member() == "ActiveChanged":
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screensaver_changed = bool(message.get_args_list()[0])
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#print("Screen saver {} changed. ActiveChanged: {}".format(screensaver, screensaver_changed))
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# Capture the GetActive method call in a try/except, or the screensavers that
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# don't support GetActive will block those that do
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try:
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screensaver_path = '/{0}'.format(screensaver.replace('.', '/'))
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screensaver_obj = session.get_object(screensaver, screensaver_path)
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screensaver_iface = dbus.Interface(screensaver_obj, screensaver)
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status = bool(screensaver_iface.GetActive())
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#print("Screen saver {} changed. GetActive: {}".format(screensaver, status))
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kbd = setup_usb()
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send_packets(kbd, not status)
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except:
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continue
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# Set up USB
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def setup_usb():
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kbd = usb.core.find(idVendor=vendor, idProduct=product)
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if kbd is None:
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raise ValueError('Keyboard not found; perhaps switch to USB mode?')
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print("Product: ", kbd.product)
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print("Manufacturer: ", kbd.manufacturer)
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return kbd
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# Send packet/s
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def send_packets(kbd, switch):
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if kbd is None:
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setup_usb()
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if switch is True:
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#pattern = 0x01 # solid white
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#pattern = 0x02 #
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#pattern = 0x03 #
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#pattern = 0x04 #
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#pattern = 0x05 #
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#pattern = 0x06 #
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#pattern = 0x07 #
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#pattern = 0x08 #
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pattern = 0x09 # shadow_disappear
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#pattern = 0x10 #
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#pattern = 0x11 #
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#pattern = 0x12 #
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#pattern = 0x13 #
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#pattern = 0x14 #
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#pattern = 0x20 # custom pattern
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else:
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pattern = 0x00 # off
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print("Sending pattern {} command".format(switch))
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# This message tweaks the pattern between OFF (0x0) and the white shadow_disappear pattern (0x9)
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# with brightness 1/4 and speed 3/4 (I think)
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#
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# To modify the "on" pattern, capture the packets from the K621-RGB app with wireshark and usbpcap,
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# and find the last SET_REPORT request of a set of 4 with size 1068 bytes (1031 data bytes);
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# the first 20 bytes are identical in all four packets.
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#
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# You may need the preceeding three packets as well, and possibly the preceeding SET_REPORT request
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#(of size 42; I think this is a request for current settings) and GET_REPORT response (of size 290 bytes).
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#
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msg = [ 0x06, 0x03, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5a, 0xa5, 0x03, 0x03, 0x00, 0x00, 0x00, pattern, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0x55, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x31, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x00, 0x31, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x07, 0x39, 0x5a, 0xa5, 0x00, 0x10, 0x07, 0x49, 0x07, 0x49, 0x07, 0x49, 0x07, 0x49, 0x07, 0x49, 0x07, 0x49, 0x07, 0x49, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5a, 0xa5, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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0x00, 0x00Line truncated
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try:
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ret = kbd.ctrl_transfer(0x21, 0x09, 0x0306, 1, msg)
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assert ret == len(msg)
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# Prevent [Errno 32] Pipe error
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#time.sleep(0.25)
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except usb.core.USBError as e:
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print(e)
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if e.errno == 16:
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print("This issue needs more investigation... it may simply be previous invalid commands")
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# May need to reconfigure the device, or detach/reattach kernel driver, either for interface 0 or 0 _and_ 1
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elif e.errno == 2:
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print("Try unplugging and replugging the keyboard...")
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sys.exit()
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if __name__ == '__main__':
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#atexit.register(cleanup)
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main()
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