Add screen idle timeout and power button screen toggle
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>
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@ -104,6 +104,22 @@ The `app_scheduling` function in `dmenu_ln` runs the selected binary. If it exit
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No standard framebuffer image tools (`fbv`, `fbi`, `psplash`) are installed. To display a PNG on the framebuffer, decode with Python3+PIL and write raw BGRA pixels to `/dev/fb0`.
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## Backlight Control
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There is no sysfs backlight interface (`/sys/class/backlight/` is empty) and the stock `brightCtrl.bin` daemon does not expose a usable control mechanism. The backlight is controlled via the Allwinner `/dev/disp` ioctl interface:
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| Ioctl | Number | Description |
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| :------------------ | :------- | :----------------------------------- |
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| `DISP_SET_BRIGHTNESS` | `0x102` | Set backlight brightness (0–255) |
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| `DISP_GET_BRIGHTNESS` | `0x103` | Get current backlight brightness |
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Both ioctls take an argument buffer of 4 unsigned longs (`struct { unsigned long args[4]; }`):
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- `args[0]` = screen index (always 0)
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- `args[1]` = brightness value (for SET; ignored for GET)
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- Return value (for GET) is in `args[0]` after the ioctl call
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Setting brightness to 0 turns the screen off completely. The original value (typically ~50) can be restored to turn it back on. This is used by `rg35xx-screen-monitor.py` for idle timeout and power button toggle.
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## Stock Firmware Assets
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Shutdown-related assets in `/mnt/vendor/res1/shutdown/`:
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@ -123,11 +139,12 @@ The `dmenu_ln` script already supports switching the startup binary via config f
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### Setup
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1. **Copy the binary and wrapper** to the device:
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1. **Copy the binary, wrapper, and screen monitor** to the device:
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```sh
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scp build/sdlamp2 root@rg35xx:/mnt/vendor/bin/sdlamp2
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scp tools/rg35xx-wrapper.sh root@rg35xx:/mnt/vendor/bin/rg35xx-wrapper.sh
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scp tools/rg35xx-screen-monitor.py root@rg35xx:/mnt/vendor/bin/rg35xx-screen-monitor.py
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```
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2. **Add the config check** to `/mnt/vendor/ctrl/dmenu_ln`. In the section where `CMD` overrides are checked (after the existing `muos.ini` / `vpRun.ini` checks, before the `app_scheduling` call), add:
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@ -43,6 +43,13 @@ This document specifies the functional requirements for an SDL2 based media play
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## 6. Changelog
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### 2026-02-13 — Screen idle timeout and power button toggle
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- **Screen idle timeout**: New Python screen monitor (`rg35xx-screen-monitor.py`) turns off the display after 15 seconds of no input on any device. Audio continues playing. Any button press wakes the screen.
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- **Power button screen toggle**: A short press (<2s) of the power button toggles the screen on/off. Long press (3s+) still triggers shutdown via the existing wrapper logic.
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- **Allwinner /dev/disp backlight**: Uses `SET_BRIGHTNESS` / `GET_BRIGHTNESS` ioctls on `/dev/disp` since the device has no sysfs backlight interface. Brightness is restored on SIGTERM so the shutdown screen remains visible.
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- **Wrapper integration**: `rg35xx-wrapper.sh` launches the screen monitor alongside sdlamp2 and kills it during cleanup.
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### 2026-02-13 — Hold-to-shutdown with stock shutdown screen
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- **Hold-to-shutdown**: The power button monitor in `rg35xx-wrapper.sh` requires a 3-second hold before triggering shutdown. A quick tap does nothing — a background timer subshell starts on press and is cancelled on release. If held past 3 seconds, sends SIGTERM to sdlamp2 then triggers shutdown.
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138
tools/rg35xx-screen-monitor.py
Executable file
138
tools/rg35xx-screen-monitor.py
Executable file
@ -0,0 +1,138 @@
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#!/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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@ -6,13 +6,15 @@
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# concerns that don't belong in the player binary:
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# 1. Monitor power button and trigger clean shutdown
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# 2. Display the stock firmware's shutdown screen (goodbye.png → /dev/fb0)
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# 3. Launch sdlamp2 as the main process
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# 3. Screen idle timeout (off after 15s) and power button screen toggle
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# 4. Launch sdlamp2 as the main process
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#
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# Install: copy to /mnt/vendor/bin/rg35xx-wrapper.sh
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# Config: set CMD in dmenu_ln to point here instead of sdlamp2 directly
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SDLAMP2="/mnt/vendor/bin/sdlamp2"
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AUDIO_DIR="/mnt/sdcard/Music"
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SCREEN_MONITOR="/mnt/vendor/bin/rg35xx-screen-monitor.py"
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# --- WiFi hotspot ---
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# Deprioritized: connecting the device as a WiFi client to a shared network
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@ -45,6 +47,10 @@ monitor_power_button() {
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done
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}
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# --- Screen idle timeout + power button screen toggle ---
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python3 "$SCREEN_MONITOR" &
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SCREEN_MONITOR_PID=$!
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# --- Launch sdlamp2 ---
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# Run in background so we can capture PID for the power button monitor.
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"$SDLAMP2" "$AUDIO_DIR" &
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@ -58,7 +64,9 @@ wait "$SDLAMP2_PID"
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SDLAMP2_EXIT=$?
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# --- Cleanup ---
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# Kill the power button monitor if it's still running
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# Kill the screen monitor (SIGTERM restores brightness) and power button monitor.
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kill "$SCREEN_MONITOR_PID" 2>/dev/null
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wait "$SCREEN_MONITOR_PID" 2>/dev/null
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kill "$MONITOR_PID" 2>/dev/null
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# If this was a shutdown, call poweroff and block so the loadapp.sh restart
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