linux-kernel - Re: [RFC v1 0/4] Input: support virtual objects on touchscreens

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Date:   Tue, 25 Apr 2023 17:29:39 +0200
From:   Thomas Weißschuh <thomas@...ch.de>
To:     Javier Carrasco <javier.carrasco@...fvision.net>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Henrik Rydberg <rydberg@...math.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Stephen Boyd <sboyd@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Uwe Kleine-g <u.kleine-koenig@...gutronix.de>,
        Bastian Hecht <hechtb@...il.com>,
        Michael Riesch <michael.riesch@...fvision.net>
Subject: Re: [RFC v1 0/4] Input: support virtual objects on touchscreens

Hi Javier,

On 2023-04-25 13:50:45+0200, Javier Carrasco wrote:
> Some touchscreens are shipped with a physical layer on top of them where
> a number of buttons and a resized touchscreen surface might be available.
> 
> In order to generate proper key events by overlay buttons and adjust the
> touch events to a clipped surface, these patches offer a documented,
> device-tree-based solution by means of helper functions.
> An implementation for a specific touchscreen driver is also included.
> 
> The functions in ts-virtobj provide a simple workflow to acquire
> physical objects from the device tree, map them into the device driver
> structures as virtual objects and generate events according to
> the object descriptions.
> 
> This solution has been tested with a JT240MHQS-E3 display, which uses
> the st1624 as a touchscreen and provides two overly buttons and a frame
> that clips its effective surface.

There are quite a few of notebooks from Asus that feature a printed
numpad on their touchpad [0]. The mapping from the touch events to the
numpad events needs to happen in software.

Do you think your solution is general enough to also support this
usecase?

The differences I see are
* not device-tree based
* touchpads instead of touchscreens

> [..]

[0] https://unix.stackexchange.com/q/494400