linux-kernel - Re: [PATCH v2] HID: clamp input to logical range if no null state

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Message-ID: <alpine.LSU.2.20.1703211454240.31814@cbobk.fhfr.pm>
Date:   Tue, 21 Mar 2017 14:54:41 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Tomasz Kramkowski <tk@...-tk.com>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: clamp input to logical range if no null state

On Tue, 14 Mar 2017, Tomasz Kramkowski wrote:

> This patch fixes an issue in drivers/hid/hid-input.c where values
> outside of the logical range are not clamped when "null state" bit of
> the input control is not set.
> 
> This was discussed on the lists [1] and this change stems from the fact
> due to the ambiguity of the HID specification it might be appropriate to
> follow Microsoft's own interpretation of the specification. As noted in
> Microsoft's documentation [2] in the section titled "Required HID usages
> for digitizers" it is noted that values reported outside the logical
> range "will be considered as invalid data and the value will be changed
> to the nearest boundary value (logical min/max)."
> 
> This patch fixes an issue where the (1292:4745) Innomedia INNEX
> GENESIS/ATARI reports out of range values for its X and Y axis of the
> DPad which, due to the null state bit being unset, are forwarded to
> userspace as is. Now these values will get clamped to the logical range
> before being forwarded to userspace. This device was also used to test
> this patch.
> 
> This patch expands on commit 3f3752705dbd ("HID: reject input outside
> logical range only if null state is set").
> 
> Signed-off-by: Tomasz Kramkowski <tk@...-tk.com>
> Acked-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

I've added the forgotten references and applied to 
for-4.12/hid-core-null-state-handling. Thanks,

-- 
Jiri Kosina
SUSE Labs