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Commit dd4cae8b authored by Christian Gmeiner's avatar Christian Gmeiner Committed by Dmitry Torokhov
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Input: Add Microchip AR1021 i2c touchscreen 

This patch adds support for the ar1021 i2c based touchscreen.
The driver is quite simple and only supports the Touch
Reporting Protocol.

This is the final version for an RFC patch send a while ago.
http://www.spinics.net/lists/linux-input/msg29419.html



Signed-off-by: default avatarChristian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 3f1fe73b

drivers/input/touchscreen/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -90,6 +90,18 @@ config TOUCHSCREEN_AD7879_SPI 
	  To compile this driver as a module, choose M here: the

	  module will be called ad7879-spi.



config TOUCHSCREEN_AR1021_I2C

	tristate "Microchip AR1021 i2c touchscreen"

	depends on I2C && OF

	help

	  Say Y here if you have the Microchip AR1021 touchscreen controller

	  chip in your system.



	  If unsure, say N.



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

	  module will be called ar1021_i2c.



config TOUCHSCREEN_ATMEL_MXT

	tristate "Atmel mXT I2C Touchscreen"

	depends on I2C

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o 
obj-$(CONFIG_TOUCHSCREEN_AD7879_I2C)	+= ad7879-i2c.o

obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI)	+= ad7879-spi.o

obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o

obj-$(CONFIG_TOUCHSCREEN_AR1021_I2C)	+= ar1021_i2c.o

obj-$(CONFIG_TOUCHSCREEN_ATMEL_MXT)	+= atmel_mxt_ts.o

obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR)	+= auo-pixcir-ts.o

obj-$(CONFIG_TOUCHSCREEN_BU21013)	+= bu21013_ts.o

drivers/input/touchscreen/ar1021_i2c.c

0 → 100644
+181 −0
Original line number Diff line number Diff line 
/*

 * Microchip AR1021 driver for I2C

 *

 * Author: Christian Gmeiner <christian.gmeiner@gmail.com>

 *

 * License: GPLv2 as published by the FSF.

 */



#include <linux/module.h>

#include <linux/input.h>

#include <linux/of.h>

#include <linux/i2c.h>

#include <linux/irq.h>

#include <linux/interrupt.h>



#define AR1021_TOCUH_PKG_SIZE	5



#define AR1021_MAX_X	4095

#define AR1021_MAX_Y	4095



struct ar1021_i2c {

	struct i2c_client *client;

	struct input_dev *input;

	u8 data[AR1021_TOCUH_PKG_SIZE];

};



static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id)

{

	struct ar1021_i2c *ar1021 = dev_id;

	struct input_dev *input = ar1021->input;

	u8 *data = ar1021->data;

	unsigned int x, y, button;

	int retval;



	retval = i2c_master_recv(ar1021->client,

				ar1021->data, sizeof(ar1021->data));

	if (retval != sizeof(ar1021->data))

		goto out;



	/* sync bit set ? */

	if ((data[0] & 0x80) == 0)

		goto out;



	button = data[0] & BIT(0);

	x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f);

	y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f);



	input_report_abs(input, ABS_X, x);

	input_report_abs(input, ABS_Y, y);

	input_report_key(input, BTN_TOUCH, button);

	input_sync(input);



out:

	return IRQ_HANDLED;

}



static int ar1021_i2c_open(struct input_dev *dev)

{

	struct ar1021_i2c *ar1021 = input_get_drvdata(dev);

	struct i2c_client *client = ar1021->client;



	enable_irq(client->irq);



	return 0;

}



static void ar1021_i2c_close(struct input_dev *dev)

{

	struct ar1021_i2c *ar1021 = input_get_drvdata(dev);

	struct i2c_client *client = ar1021->client;



	disable_irq(client->irq);

}



static int ar1021_i2c_probe(struct i2c_client *client,

				     const struct i2c_device_id *id)

{

	struct ar1021_i2c *ar1021;

	struct input_dev *input;

	int error;



	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {

		dev_err(&client->dev, "i2c_check_functionality error\n");

		return -ENXIO;

	}



	ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL);

	if (!ar1021)

		return -ENOMEM;



	input = devm_input_allocate_device(&client->dev);

	if (!input)

		return -ENOMEM;



	ar1021->client = client;

	ar1021->input = input;



	input->name = "ar1021 I2C Touchscreen";

	input->id.bustype = BUS_I2C;

	input->dev.parent = &client->dev;

	input->open = ar1021_i2c_open;

	input->close = ar1021_i2c_close;



	input_set_capability(input, EV_KEY, BTN_TOUCH);

	input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0);

	input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0);



	input_set_drvdata(input, ar1021);



	error = devm_request_threaded_irq(&client->dev, client->irq,

					  NULL, ar1021_i2c_irq,

					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,

					  "ar1021_i2c", ar1021);

	if (error) {

		dev_err(&client->dev,

			"Failed to enable IRQ, error: %d\n", error);

		return error;

	}



	/* Disable the IRQ, we'll enable it in ar1021_i2c_open() */

	disable_irq(client->irq);



	error = input_register_device(ar1021->input);

	if (error) {

		dev_err(&client->dev,

			"Failed to register input device, error: %d\n", error);

		return error;

	}



	i2c_set_clientdata(client, ar1021);

	return 0;

}



static int __maybe_unused ar1021_i2c_suspend(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);



	disable_irq(client->irq);



	return 0;

}



static int __maybe_unused ar1021_i2c_resume(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);



	enable_irq(client->irq);



	return 0;

}



static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume);



static const struct i2c_device_id ar1021_i2c_id[] = {

	{ "MICROCHIP_AR1021_I2C", 0 },

	{ },

};

MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id);



static struct of_device_id ar1021_i2c_of_match[] = {

	{ .compatible = "microchip,ar1021-i2c", },

	{ }

};

MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match);



static struct i2c_driver ar1021_i2c_driver = {

	.driver	= {

		.name	= "ar1021_i2c",

		.owner	= THIS_MODULE,

		.pm	= &ar1021_i2c_pm,

		.of_match_table = ar1021_i2c_of_match,

	},



	.probe		= ar1021_i2c_probe,

	.id_table	= ar1021_i2c_id,

};

module_i2c_driver(ar1021_i2c_driver);



MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");

MODULE_DESCRIPTION("Microchip AR1021 I2C Driver");

MODULE_LICENSE("GPL");