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Commit a4054596 authored by Roger Quadros's avatar Roger Quadros Committed by Dmitry Torokhov
Browse files

Input: pixcir_i2c_ts - add device tree support 



Provide device tree support and binding information.  Also provide support
for a new chip "pixcir_tangoc".

Signed-off-by: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 36874c7e

Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt

0 → 100644
+26 −0
Original line number Diff line number Diff line 
* Pixcir I2C touchscreen controllers



Required properties:

- compatible: must be "pixcir,pixcir_ts" or "pixcir,pixcir_tangoc"

- reg: I2C address of the chip

- interrupts: interrupt to which the chip is connected

- attb-gpio: GPIO connected to the ATTB line of the chip

- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)

- touchscreen-size-y: vertical resolution of touchscreen (in pixels)



Example:



	i2c@00000000 {

		/* ... */



		pixcir_ts@5c {

			compatible = "pixcir,pixcir_ts";

			reg = <0x5c>;

			interrupts = <2 0>;

			attb-gpio = <&gpf 2 0 2>;

			touchscreen-size-x = <800>;

			touchscreen-size-y = <600>;

		};



		/* ... */

	};

Documentation/devicetree/bindings/vendor-prefixes.txt

+1 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ panasonic Panasonic Corporation 
phytec	PHYTEC Messtechnik GmbH

picochip	Picochip Ltd

plathome	Plat'Home Co., Ltd.

pixcir  PIXCIR MICROELECTRONICS Co., Ltd

powervr	PowerVR (deprecated, use img)

qca	Qualcomm Atheros, Inc.

qcom	Qualcomm Technologies, Inc

drivers/input/touchscreen/pixcir_i2c_ts.c

+77 −0
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ 
#include <linux/input/mt.h>

#include <linux/input/pixcir_ts.h>

#include <linux/gpio.h>

#include <linux/of.h>

#include <linux/of_gpio.h>

#include <linux/of_device.h>



#define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
@@ -407,16 +410,69 @@ unlock: 
static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,

			 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);



#ifdef CONFIG_OF

static const struct of_device_id pixcir_of_match[];



static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)

{

	struct pixcir_ts_platform_data *pdata;

	struct device_node *np = dev->of_node;

	const struct of_device_id *match;



	match = of_match_device(of_match_ptr(pixcir_of_match), dev);

	if (!match)

		return ERR_PTR(-EINVAL);



	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);

	if (!pdata)

		return ERR_PTR(-ENOMEM);



	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;



	pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);

	/* gpio_attb validity is checked in probe */



	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {

		dev_err(dev, "Failed to get touchscreen-size-x property\n");

		return ERR_PTR(-EINVAL);

	}

	pdata->x_max -= 1;



	if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {

		dev_err(dev, "Failed to get touchscreen-size-y property\n");

		return ERR_PTR(-EINVAL);

	}

	pdata->y_max -= 1;



	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,

		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);



	return pdata;

}

#else

static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)

{

	return ERR_PTR(-EINVAL);

}

#endif



static int pixcir_i2c_ts_probe(struct i2c_client *client,

					 const struct i2c_device_id *id)

{

	const struct pixcir_ts_platform_data *pdata =

			dev_get_platdata(&client->dev);

	struct device *dev = &client->dev;

	struct device_node *np = dev->of_node;

	struct pixcir_i2c_ts_data *tsdata;

	struct input_dev *input;

	int error;



	if (np && !pdata) {

		pdata = pixcir_parse_dt(dev);

		if (IS_ERR(pdata))

			return PTR_ERR(pdata);

	}



	if (!pdata) {

		dev_err(&client->dev, "platform data not defined\n");

		return -EINVAL;
@@ -522,15 +578,36 @@ static int pixcir_i2c_ts_remove(struct i2c_client *client) 


static const struct i2c_device_id pixcir_i2c_ts_id[] = {

	{ "pixcir_ts", 0 },

	{ "pixcir_tangoc", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);



#ifdef CONFIG_OF

static const struct pixcir_i2c_chip_data pixcir_ts_data = {

	.max_fingers = 2,

	/* no hw id support */

};



static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {

	.max_fingers = 5,

	.has_hw_ids = true,

};



static const struct of_device_id pixcir_of_match[] = {

	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },

	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },

	{ }

};

MODULE_DEVICE_TABLE(of, pixcir_of_match);

#endif



static struct i2c_driver pixcir_i2c_ts_driver = {

	.driver = {

		.owner	= THIS_MODULE,

		.name	= "pixcir_ts",

		.pm	= &pixcir_dev_pm_ops,

		.of_match_table = of_match_ptr(pixcir_of_match),

	},

	.probe		= pixcir_i2c_ts_probe,

	.remove		= pixcir_i2c_ts_remove,