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.

avnet	Avnet, Inc.

axentia	Axentia Technologies AB

axentia	Axentia Technologies AB

axis	Axis Communications AB

axis	Axis Communications AB

azoteq	Azoteq (Pty) Ltd

bananapi BIPAI KEJI LIMITED

bananapi BIPAI KEJI LIMITED

bhf	Beckhoff Automation GmbH & Co. KG

bhf	Beckhoff Automation GmbH & Co. KG

bitmain	Bitmain Technologies

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

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

	  module will be called bu21023_ts.

	  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
 
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_COLIBRI_VF50)	+= colibri-vf50-ts.o

obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023)	+= rohm_bu21023.o

obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023)	+= rohm_bu21023.o

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

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

obj-$(CONFIG_TOUCHSCREEN_IQS5XX)	+= iqs5xx.o

drivers/input/touchscreen/iqs5xx.c

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