linux-kernel - Re: ALPS Trackpoint & pressure

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Message-ID: <20180205224955.GB46524@dtor-ws>
Date:   Mon, 5 Feb 2018 14:49:55 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Pali Rohár <pali.rohar@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>
Cc:     Masaki Ota <masaki.ota@...alps.com>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: ALPS Trackpoint & pressure

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