Michael Smith
2142ed7629
New Python screen monitor uses Allwinner /dev/disp ioctls to turn off the display after 15s of no input and toggle it with a short power button press. Launched by the wrapper alongside sdlamp2. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
139 lines
4.4 KiB
Python
Executable File
139 lines
4.4 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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Screen idle timeout and power button toggle for RG35XX Plus.
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Monitors /dev/input/event{0,1,2} for activity. Turns off the screen
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(via Allwinner /dev/disp SET_BRIGHTNESS ioctl) after 15s of no input.
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Any button press wakes the screen. A short power button press (<2s)
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toggles the screen on/off.
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Launched by rg35xx-wrapper.sh alongside sdlamp2. Killed on cleanup.
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"""
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import fcntl
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import os
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import signal
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import struct
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import sys
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import time
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IDLE_TIMEOUT = 15 # seconds
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POWER_HOLD_THRESHOLD = 2.0 # seconds — short press if released before this
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# Allwinner /dev/disp ioctl commands
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DISP_GET_BRIGHTNESS = 0x103
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DISP_SET_BRIGHTNESS = 0x102
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# Input event constants
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EV_KEY = 1
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KEY_POWER = 116
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# struct input_event on aarch64: struct timeval (2x long=8 bytes each) + __u16 type + __u16 code + __s32 value
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INPUT_EVENT_FORMAT = "@llHHi"
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INPUT_EVENT_SIZE = struct.calcsize(INPUT_EVENT_FORMAT)
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EVENT_DEVICES = ["/dev/input/event0", "/dev/input/event1", "/dev/input/event2"]
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def disp_ioctl(fd, cmd, screen=0, value=0):
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# Allwinner disp ioctls take an array of 4 unsigned longs as arg
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args = struct.pack("@4L", screen, value, 0, 0)
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result = fcntl.ioctl(fd, cmd, args)
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return struct.unpack("@4L", result)[0]
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def get_brightness(disp_fd):
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return disp_ioctl(disp_fd, DISP_GET_BRIGHTNESS)
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def set_brightness(disp_fd, value):
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disp_ioctl(disp_fd, DISP_SET_BRIGHTNESS, value=value)
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def main():
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disp_fd = os.open("/dev/disp", os.O_RDWR)
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original_brightness = get_brightness(disp_fd)
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if original_brightness == 0:
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original_brightness = 50 # sensible default if already off
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screen_on = True
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power_press_time = None
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# Restore brightness on exit so goodbye.png is visible during shutdown
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def restore_and_exit(signum, frame):
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if not screen_on:
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set_brightness(disp_fd, original_brightness)
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os.close(disp_fd)
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sys.exit(0)
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signal.signal(signal.SIGTERM, restore_and_exit)
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signal.signal(signal.SIGINT, restore_and_exit)
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# Open input devices (non-blocking)
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event_fds = []
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for path in EVENT_DEVICES:
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try:
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fd = os.open(path, os.O_RDONLY | os.O_NONBLOCK)
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event_fds.append(fd)
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except OSError as e:
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print(f"screen-monitor: cannot open {path}: {e}", file=sys.stderr)
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if not event_fds:
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print("screen-monitor: no input devices available, exiting", file=sys.stderr)
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os.close(disp_fd)
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sys.exit(1)
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import select
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while True:
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readable, _, _ = select.select(event_fds, [], [], IDLE_TIMEOUT)
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if not readable:
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# Timeout — no input for IDLE_TIMEOUT seconds
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if screen_on:
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set_brightness(disp_fd, 0)
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screen_on = False
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continue
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# Process input events from all readable fds
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for fd in readable:
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while True:
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try:
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data = os.read(fd, INPUT_EVENT_SIZE)
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except BlockingIOError:
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break
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if len(data) < INPUT_EVENT_SIZE:
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break
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_sec, _usec, ev_type, ev_code, ev_value = struct.unpack(
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INPUT_EVENT_FORMAT, data
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)
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if ev_type != EV_KEY:
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continue
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# Power button handling
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if ev_code == KEY_POWER:
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if ev_value == 1: # press
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power_press_time = time.monotonic()
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elif ev_value == 0 and power_press_time is not None: # release
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hold_duration = time.monotonic() - power_press_time
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power_press_time = None
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if hold_duration < POWER_HOLD_THRESHOLD:
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# Short press — toggle screen
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if screen_on:
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set_brightness(disp_fd, 0)
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screen_on = False
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else:
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set_brightness(disp_fd, original_brightness)
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screen_on = True
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continue
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# Any other key press — wake screen if off
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if ev_value == 1 and not screen_on:
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set_brightness(disp_fd, original_brightness)
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screen_on = True
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if __name__ == "__main__":
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main()
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