I already have pen testing application for Windows that use WM_POINTER API.
Pen operation is not big problem because it use HID protocol that already handled in Haiku (but hardcoded to USB). Most complex problem is getting I2C controller working. First, I need to find ACPI device with _HID
= “808622C1” and get working MMIO ranges. Currently threre are no drivers in Haiku that use MMIO from ACPI table. I’m not sure that it actually working.