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tablet: Missing support for "scroll wheel" dials

XP-PEN tablets, unlike other tablet devices do not have "rings" or "strips" but instead scrollwheels or dials:

image

These are exposed as EV_REL events (like a mouse scrollwheel) and currently nothing in the stack (wayland-protocols, libinput, compositors, etc) is prepared to use them. Unfortunately almost all of the XP-PEN line uses this dial as far as I know, and even some have two of them! I plan on working on adding support for these. This issue is for tracking support on the wayland protocol layer, since it involves modifying the unstable tablet protocol which only exposes pen scrollwheel delta, rings, and strips.

Tasks

  • [] Propose changes to tablet v2 in the protocol
  • [] Add reference implementation in KWin
Edited by Joshua Goins
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