Evdev touchscreen calibration?

[Simon Thum]

Florian Echtler wrote:
> Hello everyone,
> 
> I've recently written an input event driver for a touchscreen, and it's
> working out-of-the box with the evdev driver. However, the scaling is a
> bit off, so I'd like to do a four-point calibration and set the "Evdev
> Axis Calibration" property accordingly. Is there a tool which does that?
> I've only found ts_calibrate so far, which is just for framebuffer
> devices.
I don't think it could be written without XI2, since AFAIK you've got no
access to raw coordinates. One might exploit special assumptions/setups,
though.