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

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Date:   Sun, 26 Apr 2020 20:15:45 +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 08:45:14PM +0300, Dmitry Osipenko wrote:
> 26.04.2020 20:29, Michał Mirosław пишет:
> > 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.
> 
> Yes, the touchscreen_parse_properties() takes bool multitouch for the
> argument, and thus, it needs to be applied to both MT/non-MT cases.
> 
> https://elixir.bootlin.com/linux/v5.7-rc2/source/drivers/input/touchscreen/of_touchscreen.c#L64

input_mt_init_slots() should copy MT axes to non-MT if they are
described before the call.

With v5 applied, I can see in evtest MT and non-MT events.

Best Regards,
Michał Mirosław