linux-kernel - Re: [PATCH v2] HID: input: fix a4tech horizontal wheel custom usage

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Date:   Thu, 01 Aug 2019 12:56:51 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     dmitry.torokhov@...il.com, wbauer@....at,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: input: fix a4tech horizontal wheel custom usage

On Tue, 2019-06-11 at 14:13 +0200, Nicolas Saenz Julienne wrote:
> Some a4tech mice use the 'GenericDesktop.00b8' usage to inform whether
> the previous wheel report was horizontal or vertical. Before
> c01908a14bf73 ("HID: input: add mapping for "Toggle Display" key") this
> usage was being mapped to 'Relative.Misc'. After the patch it's simply
> ignored (usage->type == 0 & usage->code == 0). Which ultimately makes
> hid-a4tech ignore the WHEEL/HWHEEL selection event, as it has no
> usage->type.
> 
> We shouldn't rely on a mapping for that usage as it's nonstandard and
> doesn't really map to an input event. So we bypass the mapping and make
> sure the custom event handling properly handles both reports.
> 
> Fixes: c01908a14bf73 ("HID: input: add mapping for "Toggle Display" key")
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---

It would be nice for this patch not to get lost. It fixes issues both repoted
on opensuse and fedora.

I can resubmit it if needed.

Regards,
Nicolas


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