Bring features of xinput list-props to libinput-list-devices

William Gathoye william at
Sun Jul 17 21:49:27 UTC 2016

Hello everyone,

I have just made a simple patch to libinput-list-devices.

The latter brings back a feature available in xinput when used in
combination with Xorg drivers instead of libinput.

- The maximum number of finger detected
- Reports if 3 fingers are detected

Just a few question though. In

xinput list-props "CyPS/2 Cypress Trackpad"
	Coordinate Transformation Matrix (140): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Scroll Methods Available (286):        1, 1, 0

what are the Coordinate Transformation Matrix about?

I assume "libinput Scroll Methods Available" bits are respectively for
two fingers, three fingers and four fingers scrolling detection right?

Also as I added the constant LIBINPUT_CONFIG_SCROLL_3FG, I had to adapt
the code which was using LIBINPUT_CONFIG_SCROLL_*2*FG. Also I don't know
if four, fingers, needs to be implemented.

I dont know if my changes are correct. Mr Hutterer, please correct me if
I'm wrong, this is a great exercise for me, as I'm always willing to learn.

Thanks for your answers.


William Gathoye
<william at>

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