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Move shutdown screen to wrapper, reuse stock firmware goodbye.png

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The in-app shutdown visual didn't work because SDL cleanup wiped the
framebuffer. Instead of hacking around that, move the shutdown display
to the device wrapper where it belongs. The wrapper now decodes the
stock firmware's goodbye.png with Python3+PIL and writes raw BGRA
pixels directly to /dev/fb0 before calling poweroff.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Michael Smith
2026-02-13 21:07:03 +01:00
parent 3728e9499c
commit 06daec791e
4 changed files with 86 additions and 31 deletions
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6
docs/sdlamp2-fsd.md
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@@ -43,9 +43,11 @@ This document specifies the functional requirements for an SDL2 based media play
## 6. Changelog
### 2026-02-13 — Power button monitor in device wrapper
### 2026-02-13 — Hold-to-shutdown with stock shutdown screen
- **Power button handling**: The `rg35xx-wrapper.sh` script now monitors `/dev/input/event0` (`axp2202-pek`) for `KEY_POWER` press events via `evtest`. On power button press, sends SIGTERM to sdlamp2 (which saves position and volume), waits 1 second, then calls `poweroff` for a clean shutdown.
- **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.
- **Stock shutdown screen**: The wrapper displays the stock firmware's `goodbye.png` (`/mnt/vendor/res1/shutdown/goodbye.png`) by decoding it with Python3+PIL and writing raw BGRA pixels to `/dev/fb0`. This reuses the same shutdown image that `dmenu.bin` shows, keeping the experience consistent. The shutdown display is handled entirely in the wrapper — sdlamp2 just exits cleanly on SIGTERM.
- **Restart loop blocked**: The wrapper uses a `/tmp/.sdlamp2_shutdown` flag file to distinguish shutdown from normal exit. On shutdown, the wrapper calls `poweroff` and blocks (sleep 30), preventing `loadapp.sh`'s restart loop from relaunching `dmenu_ln` and overwriting the shutdown screen.
### 2026-02-13 — Clean shutdown on SIGTERM/SIGINT