Commit a748941c authored by Michael Welling's avatar Michael Welling Committed by Dmitry Torokhov
Browse files

Input: tsc2004 - add support for tsc2004 



This adds support for the i2c based tsc2004 touchscreen controller.

Signed-off-by: default avatarMichael Welling <mwelling@ieee.org>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent ef3b98c2

Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt

+28 −6
Original line number Diff line number Diff line 
* Texas Instruments tsc2005 touchscreen controller

* Texas Instruments tsc2004 and tsc2005 touchscreen controllers



Required properties:

 - compatible		      : "ti,tsc2005"

 - reg			      : SPI device address

 - spi-max-frequency	      : Maximal SPI speed

 - compatible		      : "ti,tsc2004" or "ti,tsc2005"

 - reg			      : Device address

 - interrupts		      : IRQ specifier

 - reset-gpios		      : GPIO specifier

 - vio-supply                 : Regulator specifier

 - spi-max-frequency	      : Maximum SPI clocking speed of the device

			        (for tsc2005)



Optional properties:

 - vio-supply		      : Regulator specifier

 - reset-gpios		      : GPIO specifier for the controller reset line

 - ti,x-plate-ohms	      : integer, resistance of the touchscreen's X plates

				in ohm (defaults to 280)

 - ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
@@ -18,6 +19,27 @@ Optional properties: 


Example:



&i2c3 {

	tsc2004@48 {

		compatible = "ti,tsc2004";

		reg = <0x48>;

		vio-supply = <&vio>;



		reset-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>;

		interrupts-extended = <&gpio1 27 IRQ_TYPE_EDGE_RISING>;



		touchscreen-fuzz-x = <4>;

		touchscreen-fuzz-y = <7>;

		touchscreen-fuzz-pressure = <2>;

		touchscreen-size-x = <4096>;

		touchscreen-size-y = <4096>;

		touchscreen-max-pressure = <2048>;



		ti,x-plate-ohms = <280>;

		ti,esd-recovery-timeout-ms = <8000>;

	};

}



&mcspi1 {

	tsc2005@0 {

		compatible = "ti,tsc2005";

drivers/input/touchscreen/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -942,6 +942,19 @@ config TOUCHSCREEN_TSC_SERIO 
config TOUCHSCREEN_TSC200X_CORE

	tristate



config TOUCHSCREEN_TSC2004

	tristate "TSC2004 based touchscreens"

	depends on I2C

	select REGMAP_I2C

	select TOUCHSCREEN_TSC200X_CORE

	help

	  Say Y here if you have a TSC2004 based touchscreen.



	  If unsure, say N.



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

	  module will be called tsc2004.



config TOUCHSCREEN_TSC2005

	tristate "TSC2005 based touchscreens"

	depends on SPI_MASTER

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o 
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o

obj-$(CONFIG_TOUCHSCREEN_TSC_SERIO)	+= tsc40.o

obj-$(CONFIG_TOUCHSCREEN_TSC200X_CORE)	+= tsc200x-core.o

obj-$(CONFIG_TOUCHSCREEN_TSC2004)	+= tsc2004.o

obj-$(CONFIG_TOUCHSCREEN_TSC2005)	+= tsc2005.o

obj-$(CONFIG_TOUCHSCREEN_TSC2007)	+= tsc2007.o

obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o

drivers/input/touchscreen/tsc2004.c

0 → 100644
+83 −0
Original line number Diff line number Diff line 
/*

 * TSC2004 touchscreen driver

 *

 * Copyright (C) 2015 QWERTY Embedded Design

 * Copyright (C) 2015 EMAC Inc.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 */



#include <linux/module.h>

#include <linux/input.h>

#include <linux/of.h>

#include <linux/i2c.h>

#include <linux/regmap.h>

#include "tsc200x-core.h"



static int tsc2004_cmd(struct device *dev, u8 cmd)

{

	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;

	s32 data;

	struct i2c_client *i2c = to_i2c_client(dev);



	data = i2c_smbus_write_byte(i2c, tx);

	if (data < 0) {

		dev_err(dev, "%s: failed, command: %x i2c error: %d\n",

			__func__, cmd, data);

		return data;

	}



	return 0;

}



static int tsc2004_probe(struct i2c_client *i2c,

			 const struct i2c_device_id *id)



{

	return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,

			     devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),

			     tsc2004_cmd);

}



static int tsc2004_remove(struct i2c_client *i2c)

{

	return tsc200x_remove(&i2c->dev);

}



static const struct i2c_device_id tsc2004_idtable[] = {

	{ "tsc2004", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);



#ifdef CONFIG_OF

static const struct of_device_id tsc2004_of_match[] = {

	{ .compatible = "ti,tsc2004" },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(of, tsc2004_of_match);

#endif



static struct i2c_driver tsc2004_driver = {

	.driver = {

		.name   = "tsc2004",

		.of_match_table = of_match_ptr(tsc2004_of_match),

		.pm     = &tsc200x_pm_ops,

	},

	.id_table       = tsc2004_idtable,

	.probe          = tsc2004_probe,

	.remove         = tsc2004_remove,

};

module_i2c_driver(tsc2004_driver);



MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");

MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");

MODULE_LICENSE("GPL");