[PATCH 0/4] Input: support virtual objects on touchscreens

From: Javier Carrasco
Date: Wed May 10 2023 - 09:52:44 EST

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 overlay buttons and a frame
that clips its effective surface.

Signed-off-by: Javier Carrasco <javier.carrasco@xxxxxxxxxxxxxx>
Javier Carrasco (4):
Input: ts-virtobj - Add touchsreen virtual object handling
dt-bindings: touchscreen: add virtual-touchscreen and virtual-buttons properties
Input: st1232 - add virtual touchscreen and buttons handling
dt-bindings: input: touchscreen: st1232: add example with ts-virtobj

.../input/touchscreen/sitronix,st1232.yaml | 40 +++
.../bindings/input/touchscreen/touchscreen.yaml | 54 ++++
drivers/input/touchscreen/Kconfig | 9 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/st1232.c | 87 +++--
drivers/input/touchscreen/ts-virtobj.c | 360 +++++++++++++++++++++
include/linux/input/ts-virtobj.h | 95 ++++++
8 files changed, 635 insertions(+), 18 deletions(-)
base-commit: ac9a78681b921877518763ba0e89202254349d1b
change-id: 20230510-feature-ts_virtobj_patch-e267540aae74

Best regards,
Javier Carrasco <javier.carrasco@xxxxxxxxxxxxxx>