linux-kernel - ALPS Trackpoint & pressure

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Message-ID: <20180204150839.b5qm4wb26vic35st@pali>
Date:   Sun, 4 Feb 2018 16:08:39 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Masaki Ota <masaki.ota@...alps.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: ALPS Trackpoint & pressure

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...

-- 
Pali Rohár
pali.rohar@...il.com

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