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Add screen idle timeout and power button screen toggle

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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>
This commit is contained in:
Michael Smith
2026-02-13 21:34:43 +01:00
parent 06daec791e
commit 2142ed7629
4 changed files with 173 additions and 3 deletions
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19
docs/rg35xx-plus.md
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@@ -104,6 +104,22 @@ The `app_scheduling` function in `dmenu_ln` runs the selected binary. If it exit
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`.
## Backlight Control
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:
| Ioctl | Number | Description |
| :------------------ | :------- | :----------------------------------- |
| `DISP_SET_BRIGHTNESS` | `0x102` | Set backlight brightness (0–255) |
| `DISP_GET_BRIGHTNESS` | `0x103` | Get current backlight brightness |
Both ioctls take an argument buffer of 4 unsigned longs (`struct { unsigned long args[4]; }`):
- `args[0]` = screen index (always 0)
- `args[1]` = brightness value (for SET; ignored for GET)
- Return value (for GET) is in `args[0]` after the ioctl call
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.
## Stock Firmware Assets
Shutdown-related assets in `/mnt/vendor/res1/shutdown/`:
@@ -123,11 +139,12 @@ The `dmenu_ln` script already supports switching the startup binary via config f
### Setup
1. **Copy the binary and wrapper** to the device:
1. **Copy the binary, wrapper, and screen monitor** to the device:
```sh
scp build/sdlamp2 root@rg35xx:/mnt/vendor/bin/sdlamp2
scp tools/rg35xx-wrapper.sh root@rg35xx:/mnt/vendor/bin/rg35xx-wrapper.sh
scp tools/rg35xx-screen-monitor.py root@rg35xx:/mnt/vendor/bin/rg35xx-screen-monitor.py
```
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:

7
docs/sdlamp2-fsd.md
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@@ -43,6 +43,13 @@ This document specifies the functional requirements for an SDL2 based media play
## 6. Changelog
### 2026-02-13 — Screen idle timeout and power button toggle
- **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.
- **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.
- **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.
- **Wrapper integration**: `rg35xx-wrapper.sh` launches the screen monitor alongside sdlamp2 and kills it during cleanup.
### 2026-02-13 — Hold-to-shutdown with stock shutdown screen
- **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.