drivers/touch/cst816: add palm gesture to turn off backlight - #1979
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josiahcbloomer wants to merge 2 commits into
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josiahcbloomer wants to merge 2 commits into
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based on my testing, the CST816 appears to report a palm covering the screen as gesture 0xAA. it is not in the documented gesture list; it was found by dumping the chip's register block on device while I tried a number of different touch gestures. this is now reported by the driver Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Signed-off-by: Josiah <josiah@bloomer.cc>
adds a new global touch gesture and corresponding settings toggle - tapping the screen with your palm now immediately turns off the backlight, as if the timer expired. this mirrors the gesture functionality of many mainstream smartwatches. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Signed-off-by: Josiah <josiah@bloomer.cc>
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Adapt coredevices#1979 by Josiah Bloomer, preserving its CST816 palm detection and backlight preference. Dismiss ordinary popups and return to the selected watchface without restarting it. Keep system apps, low-power mode, reset, critical dialogs and alarms protected from the return action. Add regression tests for return behavior, palm event delivery and backlight wake after dismissal. Document Time 2 sideloading. Co-authored-by: Josiah <josiah@bloomer.cc> Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Co-authored-by: GPT-6 Astra <noreply@openai.com> Signed-off-by: devuterian <49933873+devuterian@users.noreply.github.com>
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Please, open first a new PR to add support for the gesture only. |
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Summary
Tap the screen with your palm and the backlight turns off, mirroring a gesture found on many major smartwatches on the market. Adds a new option: Settings → Display → Backlight → "Palm to sleep", which is on by default.
How the palm is detected
The CST816 seems to report this itself. Register
0x01reads0xAAfor a palm, and doesn't seem to be for anything else. it isn't in the documented gesture list and nothing in the tree referenced it. Found by dumping the chip's register block on device and testing repeatedly on my PT2.I would love if some more people would build and test on their watches.
Tests
Built for obelix@pvt. tests pass.
Tested on my Core Time 2. Haven't noticed any false positives yet.
Co-authored with Claude.