linux-kernel - Re: [PATCH v9 0/4] Input: support overlay objects on touchscreens

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Date: Mon, 22 Apr 2024 13:28:29 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Gregor Riepl <onitake@...il.com>,
 Javier Carrasco <javier.carrasco@...fvision.net>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Jeff LaBundy
 <jeff@...undy.com>, Conor Dooley <conor+dt@...nel.org>,
 Bastian Hecht <hechtb@...il.com>,
 Michael Riesch <michael.riesch@...fvision.net>
Subject: Re: [PATCH v9 0/4] Input: support overlay objects on touchscreens

Hi Gregor,

On 4/22/24 1:22 PM, Gregor Riepl wrote:
>> In order to generate proper key events by overlay buttons and adjust the
>> touch events to a clipped surface, this series offers a documented,
>> device-tree-based solution by means of helper functions.
>> An implementation for a specific touchscreen driver is also included.
> 
> I believe there's at least some x86 tablets that have such a layout, so maybe ACPI bindings would also make sense? Or can this be supported by your DT-based solution?
> 
> I'm not sure if it would really be needed for existing devices, though. It's possible they were all handled by touchscreen controller firmware so far.
> 
> Hans, do you remember if we've encountered any Silead or Goodix devices where the soft button overlay didn't work due to missing firmware support?

The x86 devices with Silead or Goodix touchscreens with soft buttons which are
part of the touchscreen digitizer that I know off all handle the soft buttons
in firmware and do not report regular touches for the soft buttons area.

So I don't think that something like this is necessary for x86 devices atm.

Regards,

Hans