I believe USB HID drivers have been in userspace for quite some time, in part precisely to provide a stable interface. I'm not sure why the Wacom drivers are an

I believe USB HID drivers have been in userspace for quite some time, in part precisely to provide a stable interface. I'm not sure why the Wacom drivers are an exception though: https://linuxwacom.github.io/ https://linuxwacom.github.io/