linux-kernel - Re: [PATCH v2 03/11] Input: add INPUT_PROP_HAPTIC

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Message-ID: <e508ebb0-809f-4245-81c7-98e8de6ffdaa@infradead.org>
Date: Mon, 18 Aug 2025 09:31:22 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Jonathan Denose <jdenose@...gle.com>, Jiri Kosina <jikos@...nel.org>,
 Benjamin Tissoires <bentiss@...nel.org>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Jonathan Corbet
 <corbet@....net>, Henrik Rydberg <rydberg@...math.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, Angela Czubak <aczubak@...gle.com>,
 Sean O'Brien <seobrien@...gle.com>
Subject: Re: [PATCH v2 03/11] Input: add INPUT_PROP_HAPTIC_TOUCHPAD



On 8/18/25 7:28 AM, Jonathan Denose wrote:
> From: Angela Czubak <aczubak@...gle.com>
> 
> INPUT_PROP_HAPTIC_TOUCHPAD property is to be set for a device with simple
> haptic capabilities.
> 
> Signed-off-by: Angela Czubak <aczubak@...gle.com>
> Co-developed-by: Jonathan Denose <jdenose@...gle.com>
> Signed-off-by: Jonathan Denose <jdenose@...gle.com>
> ---
>  Documentation/input/event-codes.rst    | 14 ++++++++++++++
>  include/uapi/linux/input-event-codes.h |  1 +
>  2 files changed, 15 insertions(+)
> 
> diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst
> index b4557462edd7b3fef9e9cd6c2c3cb2d05bb531ab..6f7aa9e8207c4aa825d9694ad891f4d105fe8196 100644
> --- a/Documentation/input/event-codes.rst
> +++ b/Documentation/input/event-codes.rst
> @@ -400,6 +400,20 @@ can report through the rotational axes (absolute and/or relative rx, ry, rz).
>  All other axes retain their meaning. A device must not mix
>  regular directional axes and accelerometer axes on the same event node.
>  
> +INPUT_PROP_HAPTIC_TOUCHPAD
> +--------------------------
> +
> +The INPUT_PROP_HAPTIC_TOUCHPAD property indicates that device:
> +- supports simple haptic auto and manual triggering
> +- can differentiate between at least 5 fingers
> +- uses correct resolution for the X/Y (units and value)
> +- report correct force per touch, and correct units for them (newtons or grams)

     reports

> +- follows the MT protocol type B
> +
> +Summing up, such devices follow the MS spec for input devices in


-- 
~Randy