Re: [PATCH] HID: fix A4Tech horizontal scrolling

[Błażej Szczygieł <spaz16@xxxxx>]

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@xxxxx> 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@xxxxx>
>
> 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