HID: bpf: Add support for the Waltop Batteryless Tablet

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Several bugs as outlined in udev-hid-bpf#66 and udev-hid-bpf!198:
- pressure curve is far from linear
- tilt range is ±60, not ±127
- pressing the second button sets both tip down and
  barrel switch

Fix the second button by adding a Secondary Barrel Switch in the
existing padding and check for the tip down/barrel switch down combo.
When  both values become true at the same time, set the Secondary Barrel
Switch instead.

Implement a custom pressure curve that maps the hardware range 0-102
linearly to the logical range 0-1224, and maps the hardware range
103-2047 logarithmically to the logical range 1232-2047. This mapping
isn’t perfect, but it’s way more natural than the stock configuration.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Jan Felix Langenbach <JanFelix.Langenbach@protonmail.com>
Link: https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/merge_requests/200
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

...

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Benjamin Tissoires 2025-11-18 18:16:26 +01:00 • committed by Jiri Kosina

parent 029dff1c31

commit 040adbe801

1 changed files with 321 additions and 0 deletions

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drivers/hid/bpf/progs/WALTOP__Batteryless-Tablet.bpf.c

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