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    Subject[PATCH v9 0/4] Input: support overlay objects on touchscreens
    Date
    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, this series offers a documented,
    device-tree-based solution by means of helper functions.
    An implementation for a specific touchscreen driver is also included.

    The functions in touch-overlay provide a simple workflow to acquire
    physical objects from the device tree, map them into a list and generate
    events according to the object descriptions.

    This feature has been tested with a JT240MHQS-E3 display, which consists
    of an st1624 as the base touchscreen and an overlay with two buttons and
    a frame that clips its effective surface mounted on it.

    To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    To: Rob Herring <robh@kernel.org>
    To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
    To: Conor Dooley <conor+dt@kernel.org>
    To: Bastian Hecht <hechtb@gmail.com>
    To: Michael Riesch <michael.riesch@wolfvision.net>
    Cc: linux-input@vger.kernel.org
    Cc: devicetree@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net>

    Changes in v9:
    - touch-overlay.c: trigger a button release if the finger slides out of
    the button segment to be consistent with the button press when sliding
    into a button segment (see touch_overlay_button_event()).
    - touch-overlay.c: (nit) remove braces in if with a single statement in
    touch_overaly_process_event().
    - Link to v8: https://lore.kernel.org/r/20240320-feature-ts_virtobj_patch-v8-0-cab6e7dcb1f6@wolfvision.net

    Changes in v8:
    - touchscreen bindings: fix description formatting.
    - Link to v7: https://lore.kernel.org/r/20240119-feature-ts_virtobj_patch-v7-0-eda70985808f@wolfvision.net

    Changes in v7:
    - General: return to a single input device implementation.
    - touchscreen bindings: segment instead of button in the label
    description.
    - touch-overlay.c: define button-specific data inside segment struct.
    - touch-overlay.c: remove fwnode_property_present() and check return
    value of fwnode_property_read_u32() in touch_overlay_get_segment().
    - touch-overlay.c: simplify return path in touch_overlay_map().
    - Link to v6: https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v6-0-d8a605975153@wolfvision.net

    Changes in v6:
    - General: use a single list to manage a single type of object.
    - General: swap patches to have bindings preceding the code.
    - touch-overlay.c: minor code-sytle fixes.
    - Link to v5: https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v5-0-ff6b5c4db693@wolfvision.net

    Changes in v5:
    - touchscreen bindings: move overlay common properties to a $def entry (Rob Herring)
    - st1232 bindings: move overlays to the existing example instead of
    making a new one (Rob Herring)
    - Link to v4: https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v4-0-5c6c0fc1eed6@wolfvision.net

    Changes in v4:
    - General: rename "touchscreen" to "touch" to include other consumers.
    - PATCH 1/4: move touch-overlay feature to input core.
    - PATCH 1/4, 3/4: set key caps and report key events without consumer's
    intervention.
    - PATCH 2/4: add missing 'required' field with the required properties.
    - Link to v3: https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v3-0-b4fb7fc4bab7@wolfvision.net

    Changes in v3:
    - General: rename "virtobj" and "virtual" to "overlay"
    - PATCH 1/4: Make feature bool instead of tristate (selected by
    supported touchscreens)
    - Link to v2: https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v2-0-f68a6bfe7a0f@wolfvision.net

    Changes in v2:
    - PATCH 1/4: remove preprocessor directives (the module is selected by
    the drivers that support the feature). Typo in the commit message.
    - PATCH 2/4: more detailed documentation. Images and examples were added.
    - PATCH 3/4: select ts-virtobj automatically.
    - Link to v1: https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v1-0-5ae5e81bc264@wolfvision.net

    ---
    Javier Carrasco (4):
    dt-bindings: touchscreen: add touch-overlay property
    Input: touch-overlay - Add touchscreen overlay handling
    dt-bindings: input: touchscreen: st1232: add touch-overlay example
    Input: st1232 - add touch overlays handling

    .../input/touchscreen/sitronix,st1232.yaml | 29 +++
    .../bindings/input/touchscreen/touchscreen.yaml | 119 ++++++++++
    MAINTAINERS | 7 +
    drivers/input/Makefile | 2 +-
    drivers/input/touch-overlay.c | 263 +++++++++++++++++++++
    drivers/input/touchscreen/st1232.c | 48 ++--
    include/linux/input/touch-overlay.h | 22 ++
    7 files changed, 475 insertions(+), 15 deletions(-)
    ---
    base-commit: 0bbac3facb5d6cc0171c45c9873a2dc96bea9680
    change-id: 20230510-feature-ts_virtobj_patch-e267540aae74

    Best regards,
    --
    Javier Carrasco <javier.carrasco@wolfvision.net>


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