linux-kernel - Re: [PATCH v4 03/10] input: elants: remove unused axes

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Message-ID: <20200426172954.GA15436@qmqm.qmqm.pl>
Date:   Sun, 26 Apr 2020 19:29:54 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     David Heidelberg <david@...t.cz>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        James Chen <james.chen@....com.tw>,
        Johnny Chuang <johnny.chuang@....com.tw>,
        Rob Herring <robh+dt@...nel.org>,
        Scott Liu <scott.liu@....com.tw>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 03/10] input: elants: remove unused axes

On Sun, Apr 26, 2020 at 07:35:47PM +0300, Dmitry Osipenko wrote:
> 26.04.2020 19:11, Michał Mirosław пишет:
> > Driver only ever reports MT events and input_mt_init_slots() sets up
> > emulated axes already.  Clear the capabilities not generated directly
> > and move MT axes setup, so they are visible by input_mt_init_slots().
> > 
> > Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> > Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> > Tested-by: Dmitry Osipenko <digetx@...il.com>
> > ---
> > v4: reword commitmsg; reorder axis setup
> > ---
> 
> Legacy pointer emulation doesn't work using v4. I think it will be
> better to drop this patch for now and add this hunk to the patch #4:

Have you tried it together with the next patch? It adds
touchscreen_parse_properties() to initialize axes also from DT, and
should be equivalent to the hunk you proposed.

[...]
> Maybe input_mt_init_slots() could be changed to set up all the
> properties that are needed for the legacy pointer, but I'm not 100% sure
> because not very familiar with that code. Perhaps Dmitry Torokhov could
> clarify?

The code of input_mt_init_slots() looks like it does initialize the
properties needed. What does evtest return with and without the patches?

Best Regards
Michał Mirosław