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

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Message-ID: <CAO-hwJLbFv3S9M5N+BKBuafj8H-vToy=2VQd=cvohmaTHLMC3A@mail.gmail.com>
Date:   Fri, 3 May 2019 09:36:41 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Błażej Szczygieł <spaz16@...pl>
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,

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
>