linux-kernel - Re: [PATCH] HID: fix A4Tech horizontal scrolling

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Date:   Fri, 3 May 2019 11:22:12 +0200
From:   Błażej Szczygieł <spaz16@...pl>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     igorkuo@...il.com, 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,

I used the hid-record tool and my results are here:
https://gitlab.com/snippets/1853568

Cheers,
Błażej

> 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.
> 
> 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
> 
>> ---
>>   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
>>