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SubjectRe: [PATCHv3 1/5] Input: add common DT binding for touchscreens
* Sebastian Reichel <sre@kernel.org> [140425 16:56]:
> Add common DT binding documentation for touchscreen devices and
> implement input_parse_touchscreen_of_params, which parses the common
> properties and configures the input device accordingly.
>
> The method currently does not interpret the axis inversion properties,
> since there is no matching flag in the generic linux input device.
>
> Signed-off-by: Sebastian Reichel <sre@kernel.org>
> ---
> .../bindings/input/touchscreen/touchscreen.txt | 27 +++++++++++++++++
> drivers/input/input.c | 34 ++++++++++++++++++++++
> include/linux/input.h | 8 +++++
> 3 files changed, 69 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> new file mode 100644
> index 0000000..d8e0616
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> @@ -0,0 +1,27 @@
> +General Touchscreen Properties:
> +
> +Optional properties for Touchscreens:
> + - touchscreen-size-x : horizontal resolution of touchscreen
> + (in pixels)
> + - touchscreen-size-y : vertical resolution of touchscreen
> + (in pixels)
> + - touchscreen-max-pressure : maximum reported pressure (arbitrary range
> + dependent on the controller)
> + - touchscreen-fuzz-x : horizontal noise value of the absolute input
> + device (in pixels)
> + - touchscreen-fuzz-y : vertical noise value of the absolute input
> + device (in pixels)
> + - touchscreen-fuzz-pressure : pressure noise value of the absolute input
> + device (arbitrary range dependent on the
> + controller)
> + - touchscreen-inverted-x : X axis is inverted (boolean)
> + - touchscreen-inverted-y : Y axis is inverted (boolean)

We probably also need something to swap x and y depending on the
display orientation in addition to the touchscreen-inverted-x and y.
Just swapping x and y is not enough depending if we rotate by 270
degrees instead of 90 degrees.

Naturally that part can be added later.

Regards,

That


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