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Date:   Fri, 3 May 2019 12:36:36 +0300
From:   Igor Kushnir <igorkuo@...il.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Błażej Szczygieł <spaz16@...pl>
Cc:     Jiri Kosina <jikos@...nel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] HID: fix A4Tech horizontal scrolling

Hi Benjamin,

On 5/3/19 10:36 AM, Benjamin Tissoires wrote:
> Hi,
> 
> On Thu, May 2, 2019 at 11:37 PM Błażej Szczygieł <spaz16@...pl> wrote:
>>
>> Since recent high resolution scrolling changes the A4Tech driver must
>> check for the "REL_WHEEL_HI_RES" usage code.
>>
>> Fixes: 2dc702c991e3774af9d7ce410eef410ca9e2357e (HID: input: use the
>> Resolution Multiplier for high-resolution scrolling)
>>
>> Signed-off-by: Błażej Szczygieł <spaz16@...pl>
> 
> Thanks for the patch. I do not doubt this fixes the issues, but I
> still wonder if we should not export REL_HWHEEL_HI_RES instead of
> REL_HWHEEL events.


If you mean exporting REL_HWHEEL_HI_RES instead of REL_HWHEEL from
hid-a4tech.c, then it makes sense to me, though I do not know the code
well enough to be certain.

Błażej and I have discussed the bug and the patch here:
https://bugzilla.kernel.org/show_bug.cgi?id=203369

In summary: the patch fixes the bug for both our mice;
the documentation in input/event-codes.rst states that
REL_WHEEL, REL_HWHEEL "are legacy codes and REL_WHEEL_HI_RES and
REL_HWHEEL_HI_RES should be preferred where available."

> Also, I can not figure out how the events are processed by the kernel.
> Could you attach a hid-recorder dump of the mouse wheels with
> hid-recorder from https://gitlab.freedesktop.org/libevdev/hid-tools ?
> 
> This should give me a better view of the mouse, and I could also add
> it to the regression tests I am running for each commit.
> 
> Cheers,
> Benjamin

After launching hid-recorder for my A4Tech WOP-49Z mouse under kernel
5.0.10 patched with Błażej's patch I:
* scrolled the vertical wheel down ("Wheel: -1");
* scrolled the vertical wheel up ("Wheel: 1");
* scrolled the horizontal wheel "left" ("Wheel: -1");
* scrolled the horizontal wheel "right" ("Wheel: 1").
Note that the horizontal wheel is physically scrolled just like the
vertical one in this mouse (forward/back), so "left" and "right" are the
effects these scrollings make in applications when the kernel supports
the mouse properly.

$ sudo ./hid-recorder /dev/hidraw1
# A4Tech PS/2+USB Mouse
# 0x05, 0x01,                    // Usage Page (Generic Desktop)        0
# 0x09, 0x02,                    // Usage (Mouse)                       2
# 0xa1, 0x01,                    // Collection (Application)            4
# 0x09, 0x01,                    //  Usage (Pointer)                    6
# 0xa1, 0x00,                    //  Collection (Physical)              8
# 0x05, 0x09,                    //   Usage Page (Button)               10
# 0x19, 0x01,                    //   Usage Minimum (1)                 12
# 0x29, 0x07,                    //   Usage Maximum (7)                 14
# 0x15, 0x00,                    //   Logical Minimum (0)               16
# 0x25, 0x01,                    //   Logical Maximum (1)               18
# 0x75, 0x01,                    //   Report Size (1)                   20
# 0x95, 0x07,                    //   Report Count (7)                  22
# 0x81, 0x02,                    //   Input (Data,Var,Abs)              24
# 0x75, 0x01,                    //   Report Size (1)                   26
# 0x95, 0x01,                    //   Report Count (1)                  28
# 0x81, 0x01,                    //   Input (Cnst,Arr,Abs)              30
# 0x05, 0x01,                    //   Usage Page (Generic Desktop)      32
# 0x09, 0x30,                    //   Usage (X)                         34
# 0x09, 0x31,                    //   Usage (Y)                         36
# 0x09, 0x38,                    //   Usage (Wheel)                     38
# 0x15, 0x81,                    //   Logical Minimum (-127)            40
# 0x25, 0x7f,                    //   Logical Maximum (127)             42
# 0x75, 0x08,                    //   Report Size (8)                   44
# 0x95, 0x03,                    //   Report Count (3)                  46
# 0x81, 0x06,                    //   Input (Data,Var,Rel)              48
# 0xc0,                          //  End Collection                     50
# 0xc0,                          // End Collection                      51
#
R: 52 05 01 09 02 a1 01 09 01 a1 00 05 09 19 01 29 07 15 00 25 01 75 01 
95 07 81 02 75 01 95 01 81 01 05 01 09 30 09 31 09 38 15 81 25 7f 75 08 
95 03 81 06 c0 c0
N: A4Tech PS/2+USB Mouse
I: 3 09da 0006
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000000.000000 4 00 00 00 ff
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000000.071952 4 00 00 00 ff
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000000.159957 4 00 00 00 ff
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:    1
E: 000002.912232 4 00 00 00 01
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:    1
E: 000002.952190 4 00 00 00 01
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:    1
E: 000004.512359 4 00 00 00 01
#  Button: 0  0  0  0  0  0  0 | # | X:    0 | Y:    0 | Wheel:    1
E: 000004.584332 4 00 00 00 01
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000007.528626 4 40 00 00 ff
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000007.568577 4 40 00 00 ff
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000008.256395 4 40 00 00 ff
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000008.336669 4 40 00 00 ff
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:   -1
E: 000008.400649 4 40 00 00 ff
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:    1
E: 000010.936908 4 40 00 00 01
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:    1
E: 000010.984864 4 40 00 00 01
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:    1
E: 000011.056897 4 40 00 00 01
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:    1
E: 000011.528936 4 40 00 00 01
#  Button: 0  0  0  0  0  0  1 | # | X:    0 | Y:    0 | Wheel:    1
E: 000011.616923 4 40 00 00 01

Cheers,
Igor

>> ---
>>   drivers/hid/hid-a4tech.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/hid/hid-a4tech.c b/drivers/hid/hid-a4tech.c
>> index 9428ea7cdf8a..fafb9fa558e7 100644
>> --- a/drivers/hid/hid-a4tech.c
>> +++ b/drivers/hid/hid-a4tech.c
>> @@ -38,7 +38,7 @@ static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
>>   {
>>          struct a4tech_sc *a4 = hid_get_drvdata(hdev);
>>
>> -       if (usage->type == EV_REL && usage->code == REL_WHEEL)
>> +       if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES)
>>                  set_bit(REL_HWHEEL, *bit);
>>
>>          if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
>> @@ -60,7 +60,7 @@ static int a4_event(struct hid_device *hdev, struct hid_field *field,
>>          input = field->hidinput->input;
>>
>>          if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
>> -               if (usage->type == EV_REL && usage->code == REL_WHEEL) {
>> +               if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
>>                          a4->delayed_value = value;
>>                          return 1;
>>                  }
>> @@ -77,7 +77,7 @@ static int a4_event(struct hid_device *hdev, struct hid_field *field,
>>                  return 1;
>>          }
>>
>> -       if (usage->code == REL_WHEEL && a4->hw_wheel) {
>> +       if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
>>                  input_event(input, usage->type, REL_HWHEEL, value);
>>                  return 1;
>>          }
>> --
>> 2.21.0
>>

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