linux-kernel - Re: [PATCH v2 2/6] HID: generic: create one input report per application type

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Message-ID: <CAKdAkRRsca1Q2Ltqr=yyZ-rr7vxkty1cGVYjFB5bcC87UtWDSw@mail.gmail.com>
Date:   Fri, 24 Aug 2018 08:44:51 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jikos@...nel.org>
Cc:     Peter Hutterer <peter.hutterer@...-t.net>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] HID: generic: create one input report per
 application type

Hi Benjamin, Jiri,

On Tue, Apr 24, 2018 at 1:04 AM Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
>
> It is not a good idea to try to fit all types of applications in the
> same input report. There are a lot of devices that are needing
> the quirk HID_MULTI_INPUT but this quirk doesn't match the actual HID
> description as it is based on the report ID.
>
> Given that most devices with MULTI_INPUT I can think of split nicely
> the devices inputs into application, it is a good thing to split the
> devices by default based on this assumption.
>
> Also make hid-multitouch following this rule, to not have to deal
> with too many input created.
>
> While we are at it, fix some checkpatch complaints about converting
> 'unsigned' to 'unsigned int'.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> ---

I see a spike of user reports on Bugzilla with HID devices being
broken on 4.18 that seem to point to this commit. For example:
https://bugzilla.kernel.org/show_bug.cgi?id=200849

Thanks.

-- 
Dmitry