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Commit 7b5bb55d authored by Jeff LaBundy's avatar Jeff LaBundy Committed by Dmitry Torokhov
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Input: add support for Azoteq IQS550/572/525 

This patch adds support for the Azoteq IQS550/572/525 family of
trackpad/touchscreen controllers.

The driver has been tested with an IQS550EV02 evaluation board. A
demonstration of the driver's capabilities is available here:

https://youtu.be/sRNNx4XZBts



Signed-off-by: default avatarJeff LaBundy <jeff@labundy.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 13bda2d0

Documentation/devicetree/bindings/input/touchscreen/iqs5xx.txt

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Azoteq IQS550/572/525 Trackpad/Touchscreen Controller



Required properties:



- compatible			: Must be equal to one of the following:

				  "azoteq,iqs550"

				  "azoteq,iqs572"

				  "azoteq,iqs525"



- reg				: I2C slave address for the device.



- interrupts			: GPIO to which the device's active-high RDY

				  output is connected (see [0]).



- reset-gpios			: GPIO to which the device's active-low NRST

				  input is connected (see [1]).



Optional properties:



- touchscreen-min-x		: See [2].



- touchscreen-min-y		: See [2].



- touchscreen-size-x		: See [2]. If this property is omitted, the

				  maximum x-coordinate is specified by the

				  device's "X Resolution" register.



- touchscreen-size-y		: See [2]. If this property is omitted, the

				  maximum y-coordinate is specified by the

				  device's "Y Resolution" register.



- touchscreen-max-pressure	: See [2]. Pressure is expressed as the sum of

				  the deltas across all channels impacted by a

				  touch event. A channel's delta is calculated

				  as its count value minus a reference, where

				  the count value is inversely proportional to

				  the channel's capacitance.



- touchscreen-fuzz-x		: See [2].



- touchscreen-fuzz-y		: See [2].



- touchscreen-fuzz-pressure	: See [2].



- touchscreen-inverted-x	: See [2]. Inversion is applied relative to that

				  which may already be specified by the device's

				  FLIP_X and FLIP_Y register fields.



- touchscreen-inverted-y	: See [2]. Inversion is applied relative to that

				  which may already be specified by the device's

				  FLIP_X and FLIP_Y register fields.



- touchscreen-swapped-x-y	: See [2]. Swapping is applied relative to that

				  which may already be specified by the device's

				  SWITCH_XY_AXIS register field.



[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

[1]: Documentation/devicetree/bindings/gpio/gpio.txt

[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt



Example:



	&i2c1 {

		/* ... */



		touchscreen@74 {

			compatible = "azoteq,iqs550";

			reg = <0x74>;

			interrupt-parent = <&gpio>;

			interrupts = <17 4>;

			reset-gpios = <&gpio 27 1>;



			touchscreen-size-x = <640>;

			touchscreen-size-y = <480>;



			touchscreen-max-pressure = <16000>;

		};



		/* ... */

	};

Documentation/devicetree/bindings/vendor-prefixes.txt

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@@ -53,6 +53,7 @@ avic Shanghai AVIC Optoelectronics Co., Ltd. 
avnet	Avnet, Inc.

axentia	Axentia Technologies AB

axis	Axis Communications AB

azoteq	Azoteq (Pty) Ltd

bananapi BIPAI KEJI LIMITED

bhf	Beckhoff Automation GmbH & Co. KG

bitmain	Bitmain Technologies

drivers/input/touchscreen/Kconfig

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@@ -1311,4 +1311,14 @@ config TOUCHSCREEN_ROHM_BU21023 
	  To compile this driver as a module, choose M here: the

	  module will be called bu21023_ts.



config TOUCHSCREEN_IQS5XX

	tristate "Azoteq IQS550/572/525 trackpad/touchscreen controller"

	depends on I2C

	help

	  Say Y to enable support for the Azoteq IQS550/572/525

	  family of trackpad/touchscreen controllers.



	  To compile this driver as a module, choose M here: the

	  module will be called iqs5xx.



endif

drivers/input/touchscreen/Makefile

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@@ -110,3 +110,4 @@ obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o 
obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50)	+= colibri-vf50-ts.o

obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023)	+= rohm_bu21023.o

obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_FW)	+= raspberrypi-ts.o

obj-$(CONFIG_TOUCHSCREEN_IQS5XX)	+= iqs5xx.o

drivers/input/touchscreen/iqs5xx.c

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