On Sun, Feb 04, 2018 at 04:08:39PM +0100, Pali Rohár wrote:

Hi! Now playing again with trackpoint connected to ALPS rushmore
touchpad and I'm seeking a nice feature. Via ALPS PS/2 protocol it
reports pressure of trackpoint. Parser for it is already implemented in
alps.c and value is assigned to variable "z". When I just move
trackpoint z is zero, when I push trackpoint while moving, then z is
number higher, maximally 32. Variable "z" is set, but unused.

Do we have some input interface which can be used to report this
pressure of trackpoint to userspace? I can use this feature e.g. as
additional button...

We could either do the conversion in kernel and emit BTN_LEFT, or
report ABS_PRESSURE and see if userspace will be able to handle
REL_X/REL_Y/ABS_PRESSURE device.

Adding Peter.

-- 
Dmitry