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

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Date:   Sun, 26 Apr 2020 20:45:14 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
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

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

> [...]
>> 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?

==== vanilla v4 (doesn't work) ====

Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "Elan Touchscreen"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        9
    Event code 48 (ABS_MT_TOUCH_MAJOR)
      Value      0
      Min        0
      Max      255
      Resolution       1
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     1279
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     2111
    Event code 55 (ABS_MT_TOOL_TYPE)
      Value      0
      Min        0
      Max        2
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
    Event code 58 (ABS_MT_PRESSURE)
      Value      0
      Min        0
      Max      255

Event: time 1587922487.077439, type 3 (EV_ABS), code 57
(ABS_MT_TRACKING_ID), value 64
Event: time 1587922487.077439, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 855
Event: time 1587922487.077439, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 893
Event: time 1587922487.077439, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 47
Event: time 1587922487.077439, type 1 (EV_KEY), code 330 (BTN_TOUCH),
value 1
Event: time 1587922487.077439, -------------- SYN_REPORT ------------
Event: time 1587922487.089144, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 899
Event: time 1587922487.089144, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 124
Event: time 1587922487.089144, type 3 (EV_ABS), code 48
(ABS_MT_TOUCH_MAJOR), value 11
Event: time 1587922487.089144, -------------- SYN_REPORT ------------
Event: time 1587922487.100292, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 854
Event: time 1587922487.100292, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 911
Event: time 1587922487.100292, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 166
Event: time 1587922487.100292, -------------- SYN_REPORT ------------
Event: time 1587922487.109238, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 851
Event: time 1587922487.109238, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 922
Event: time 1587922487.109238, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 180
Event: time 1587922487.109238, -------------- SYN_REPORT ------------
Event: time 1587922487.117997, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 847
Event: time 1587922487.117997, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 936
Event: time 1587922487.117997, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 187
Event: time 1587922487.117997, -------------- SYN_REPORT ------------
Event: time 1587922487.126925, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 841
Event: time 1587922487.126925, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 947
Event: time 1587922487.126925, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 199
Event: time 1587922487.126925, -------------- SYN_REPORT ------------
Event: time 1587922487.139066, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 836
Event: time 1587922487.139066, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 958
Event: time 1587922487.139066, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 204
Event: time 1587922487.139066, -------------- SYN_REPORT ------------
Event: time 1587922487.150355, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 829
Event: time 1587922487.150355, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 969
Event: time 1587922487.150355, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 207
Event: time 1587922487.150355, -------------- SYN_REPORT ------------
Event: time 1587922487.172261, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 826
Event: time 1587922487.172261, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 977
Event: time 1587922487.172261, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 183
Event: time 1587922487.172261, -------------- SYN_REPORT ------------
Event: time 1587922487.205326, type 3 (EV_ABS), code 57
(ABS_MT_TRACKING_ID), value -1
Event: time 1587922487.205326, type 1 (EV_KEY), code 330 (BTN_TOUCH),
value 0
Event: time 1587922487.205326, -------------- SYN_REPORT ------------


==== v4 with reverted patch #3 + my hunk applied (works) ====

Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "Elan Touchscreen"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value      0
      Min        0
      Max     1279
    Event code 1 (ABS_Y)
      Value      0
      Min        0
      Max     2111
    Event code 24 (ABS_PRESSURE)
      Value      0
      Min        0
      Max      255
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        9
    Event code 48 (ABS_MT_TOUCH_MAJOR)
      Value      0
      Min        0
      Max      255
      Resolution       1
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     1279
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     2111
    Event code 55 (ABS_MT_TOOL_TYPE)
      Value      0
      Min        0
      Max        2
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
    Event code 58 (ABS_MT_PRESSURE)
      Value      0
      Min        0
      Max      255
Testing ... (interrupt to exit)
Event: time 1587922846.335151, type 3 (EV_ABS), code 57
(ABS_MT_TRACKING_ID), value 0
Event: time 1587922846.335151, type 3 (EV_ABS), code 53
(ABS_MT_POSITION_X), value 565
Event: time 1587922846.335151, type 3 (EV_ABS), code 54
(ABS_MT_POSITION_Y), value 423
Event: time 1587922846.335151, type 3 (EV_ABS), code 58
(ABS_MT_PRESSURE), value 39
Event: time 1587922846.335151, type 3 (EV_ABS), code 48
(ABS_MT_TOUCH_MAJOR), value 10
Event: time 1587922846.335151, type 1 (EV_KEY), code 330 (BTN_TOUCH),
value 1
Event: time 1587922846.335151, type 3 (EV_ABS), code 0 (ABS_X), value 565
Event: time 1587922846.335151, type 3 (EV_ABS), code 1 (ABS_Y), value 423
Event: time 1587922846.335151, type 3 (EV_ABS), code 24 (ABS_PRESSURE),
value 39
Event: time 1587922846.335151, -------------- SYN_REPORT ------------
Event: time 1587922846.464426, type 3 (EV_ABS), code 57
(ABS_MT_TRACKING_ID), value -1
Event: time 1587922846.464426, type 1 (EV_KEY), code 330 (BTN_TOUCH),
value 0
Event: time 1587922846.464426, type 3 (EV_ABS), code 24 (ABS_PRESSURE),
value 0
Event: time 1587922846.464426, -------------- SYN_REPORT ------------