drivers/input/touchscreen/cy8ctmg110_ts.c - linux - Git at Google

 /*
  * Driver for cypress touch screen controller
  *
  * Copyright (c) 2009 Aava Mobile
  *
  * Some cleanups by Alan Cox <alan@linux.intel.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/i2c.h>
 #include <linux/gpio.h>
 #include <linux/input/cy8ctmg110_pdata.h>

 #define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"

 /* Touch coordinates */
 #define CY8CTMG110_X_MIN		0
 #define CY8CTMG110_Y_MIN		0
 #define CY8CTMG110_X_MAX		759
 #define CY8CTMG110_Y_MAX		465


 /* cy8ctmg110 register definitions */
 #define CY8CTMG110_TOUCH_WAKEUP_TIME	0
 #define CY8CTMG110_TOUCH_SLEEP_TIME	2
 #define CY8CTMG110_TOUCH_X1		3
 #define CY8CTMG110_TOUCH_Y1		5
 #define CY8CTMG110_TOUCH_X2		7
 #define CY8CTMG110_TOUCH_Y2		9
 #define CY8CTMG110_FINGERS		11
 #define CY8CTMG110_GESTURE		12
 #define CY8CTMG110_REG_MAX		13


 /*
  * The touch driver structure.
  */
 struct cy8ctmg110 {
 	struct input_dev *input;
 	char phys[32];
 	struct i2c_client *client;
 	int reset_pin;
 	int irq_pin;
 };

 /*
  * cy8ctmg110_power is the routine that is called when touch hardware
  * will powered off or on.
  */
 static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
 {
 	if (ts->reset_pin)
 		gpio_direction_output(ts->reset_pin, 1 - poweron);
 }

 static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
 		unsigned char len, unsigned char *value)
 {
 	struct i2c_client *client = tsc->client;
 	int ret;
 	unsigned char i2c_data[6];

 	BUG_ON(len > 5);

 	i2c_data[0] = reg;
 	memcpy(i2c_data + 1, value, len);

 	ret = i2c_master_send(client, i2c_data, len + 1);
 	if (ret != len + 1) {
 		dev_err(&client->dev, "i2c write data cmd failed\n");
 		return ret < 0 ? ret : -EIO;
 	}

 	return 0;
 }

 static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
 		unsigned char *data, unsigned char len, unsigned char cmd)
 {
 	struct i2c_client *client = tsc->client;
 	int ret;
 	struct i2c_msg msg[2] = {
 		/* first write slave position to i2c devices */
 		{
 			.addr = client->addr,
 			.len = 1,
 			.buf = &cmd
 		},
 		/* Second read data from position */
 		{
 			.addr = client->addr,
 			.flags = I2C_M_RD,
 			.len = len,
 			.buf = data
 		}
 	};

 	ret = i2c_transfer(client->adapter, msg, 2);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
 {
 	struct input_dev *input = tsc->input;
 	unsigned char reg_p[CY8CTMG110_REG_MAX];
 	int x, y;

 	memset(reg_p, 0, CY8CTMG110_REG_MAX);

 	/* Reading coordinates */
 	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
 		return -EIO;

 	y = reg_p[2] << 8 | reg_p[3];
 	x = reg_p[0] << 8 | reg_p[1];

 	/* Number of touch */
 	if (reg_p[8] == 0) {
 		input_report_key(input, BTN_TOUCH, 0);
 	} else  {
 		input_report_key(input, BTN_TOUCH, 1);
 		input_report_abs(input, ABS_X, x);
 		input_report_abs(input, ABS_Y, y);
 	}

 	input_sync(input);

 	return 0;
 }

 static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
 {
 	unsigned char reg_p[3];

 	if (sleep) {
 		reg_p[0] = 0x00;
 		reg_p[1] = 0xff;
 		reg_p[2] = 5;
 	} else {
 		reg_p[0] = 0x10;
 		reg_p[1] = 0xff;
 		reg_p[2] = 0;
 	}

 	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
 }

 static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
 {
 	struct cy8ctmg110 *tsc = dev_id;

 	cy8ctmg110_touch_pos(tsc);

 	return IRQ_HANDLED;
 }

 static int cy8ctmg110_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
 	const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
 	struct cy8ctmg110 *ts;
 	struct input_dev *input_dev;
 	int err;

 	/* No pdata no way forward */
 	if (pdata == NULL) {
 		dev_err(&client->dev, "no pdata\n");
 		return -ENODEV;
 	}

 	if (!i2c_check_functionality(client->adapter,
 					I2C_FUNC_SMBUS_READ_WORD_DATA))
 		return -EIO;

 	ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!ts || !input_dev) {
 		err = -ENOMEM;
 		goto err_free_mem;
 	}

 	ts->client = client;
 	ts->input = input_dev;
 	ts->reset_pin = pdata->reset_pin;
 	ts->irq_pin = pdata->irq_pin;

 	snprintf(ts->phys, sizeof(ts->phys),
 		 "%s/input0", dev_name(&client->dev));

 	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
 	input_dev->phys = ts->phys;
 	input_dev->id.bustype = BUS_I2C;
 	input_dev->dev.parent = &client->dev;

 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

 	input_set_abs_params(input_dev, ABS_X,
 			CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
 	input_set_abs_params(input_dev, ABS_Y,
 			CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);

 	if (ts->reset_pin) {
 		err = gpio_request(ts->reset_pin, NULL);
 		if (err) {
 			dev_err(&client->dev,
 				"Unable to request GPIO pin %d.\n",
 				ts->reset_pin);
 			goto err_free_mem;
 		}
 	}

 	cy8ctmg110_power(ts, true);
 	cy8ctmg110_set_sleepmode(ts, false);

 	err = gpio_request(ts->irq_pin, "touch_irq_key");
 	if (err < 0) {
 		dev_err(&client->dev,
 			"Failed to request GPIO %d, error %d\n",
 			ts->irq_pin, err);
 		goto err_shutoff_device;
 	}

 	err = gpio_direction_input(ts->irq_pin);
 	if (err < 0) {
 		dev_err(&client->dev,
 			"Failed to configure input direction for GPIO %d, error %d\n",
 			ts->irq_pin, err);
 		goto err_free_irq_gpio;
 	}

 	client->irq = gpio_to_irq(ts->irq_pin);
 	if (client->irq < 0) {
 		err = client->irq;
 		dev_err(&client->dev,
 			"Unable to get irq number for GPIO %d, error %d\n",
 			ts->irq_pin, err);
 		goto err_free_irq_gpio;
 	}

 	err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
 				   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 				   "touch_reset_key", ts);
 	if (err < 0) {
 		dev_err(&client->dev,
 			"irq %d busy? error %d\n", client->irq, err);
 		goto err_free_irq_gpio;
 	}

 	err = input_register_device(input_dev);
 	if (err)
 		goto err_free_irq;

 	i2c_set_clientdata(client, ts);
 	device_init_wakeup(&client->dev, 1);
 	return 0;

 err_free_irq:
 	free_irq(client->irq, ts);
 err_free_irq_gpio:
 	gpio_free(ts->irq_pin);
 err_shutoff_device:
 	cy8ctmg110_set_sleepmode(ts, true);
 	cy8ctmg110_power(ts, false);
 	if (ts->reset_pin)
 		gpio_free(ts->reset_pin);
 err_free_mem:
 	input_free_device(input_dev);
 	kfree(ts);
 	return err;
 }

 static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

 	if (device_may_wakeup(&client->dev))
 		enable_irq_wake(client->irq);
 	else {
 		cy8ctmg110_set_sleepmode(ts, true);
 		cy8ctmg110_power(ts, false);
 	}
 	return 0;
 }

 static int __maybe_unused cy8ctmg110_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

 	if (device_may_wakeup(&client->dev))
 		disable_irq_wake(client->irq);
 	else {
 		cy8ctmg110_power(ts, true);
 		cy8ctmg110_set_sleepmode(ts, false);
 	}
 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);

 static int cy8ctmg110_remove(struct i2c_client *client)
 {
 	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

 	cy8ctmg110_set_sleepmode(ts, true);
 	cy8ctmg110_power(ts, false);

 	free_irq(client->irq, ts);
 	input_unregister_device(ts->input);
 	gpio_free(ts->irq_pin);
 	if (ts->reset_pin)
 		gpio_free(ts->reset_pin);
 	kfree(ts);

 	return 0;
 }

 static const struct i2c_device_id cy8ctmg110_idtable[] = {
 	{ CY8CTMG110_DRIVER_NAME, 1 },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);

 static struct i2c_driver cy8ctmg110_driver = {
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= CY8CTMG110_DRIVER_NAME,
 		.pm	= &cy8ctmg110_pm,
 	},
 	.id_table	= cy8ctmg110_idtable,
 	.probe		= cy8ctmg110_probe,
 	.remove		= cy8ctmg110_remove,
 };

 module_i2c_driver(cy8ctmg110_driver);

 MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
 MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Driver for cypress touch screen controller
	*
	* Copyright (c) 2009 Aava Mobile
	*
	* Some cleanups by Alan Cox <alan@linux.intel.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/input.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/i2c.h>
	#include <linux/gpio.h>
	#include <linux/input/cy8ctmg110_pdata.h>

	#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"

	/* Touch coordinates */
	#define CY8CTMG110_X_MIN 0
	#define CY8CTMG110_Y_MIN 0
	#define CY8CTMG110_X_MAX 759
	#define CY8CTMG110_Y_MAX 465


	/* cy8ctmg110 register definitions */
	#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
	#define CY8CTMG110_TOUCH_SLEEP_TIME 2
	#define CY8CTMG110_TOUCH_X1 3
	#define CY8CTMG110_TOUCH_Y1 5
	#define CY8CTMG110_TOUCH_X2 7
	#define CY8CTMG110_TOUCH_Y2 9
	#define CY8CTMG110_FINGERS 11
	#define CY8CTMG110_GESTURE 12
	#define CY8CTMG110_REG_MAX 13


	/*
	* The touch driver structure.
	*/
	struct cy8ctmg110 {
	struct input_dev *input;
	char phys[32];
	struct i2c_client *client;
	int reset_pin;
	int irq_pin;
	};

	/*
	* cy8ctmg110_power is the routine that is called when touch hardware
	* will powered off or on.
	*/
	static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
	{
	if (ts->reset_pin)
	gpio_direction_output(ts->reset_pin, 1 - poweron);
	}

	static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
	unsigned char len, unsigned char *value)
	{
	struct i2c_client *client = tsc->client;
	int ret;
	unsigned char i2c_data[6];

	BUG_ON(len > 5);

	i2c_data[0] = reg;
	memcpy(i2c_data + 1, value, len);

	ret = i2c_master_send(client, i2c_data, len + 1);
	if (ret != len + 1) {
	dev_err(&client->dev, "i2c write data cmd failed\n");
	return ret < 0 ? ret : -EIO;
	}

	return 0;
	}

	static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
	unsigned char *data, unsigned char len, unsigned char cmd)
	{
	struct i2c_client *client = tsc->client;
	int ret;
	struct i2c_msg msg[2] = {
	/* first write slave position to i2c devices */
	{
	.addr = client->addr,
	.len = 1,
	.buf = &cmd
	},
	/* Second read data from position */
	{
	.addr = client->addr,
	.flags = I2C_M_RD,
	.len = len,
	.buf = data
	}
	};

	ret = i2c_transfer(client->adapter, msg, 2);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
	{
	struct input_dev *input = tsc->input;
	unsigned char reg_p[CY8CTMG110_REG_MAX];
	int x, y;

	memset(reg_p, 0, CY8CTMG110_REG_MAX);

	/* Reading coordinates */
	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
	return -EIO;

	y = reg_p[2] << 8 \| reg_p[3];
	x = reg_p[0] << 8 \| reg_p[1];

	/* Number of touch */
	if (reg_p[8] == 0) {
	input_report_key(input, BTN_TOUCH, 0);
	} else {
	input_report_key(input, BTN_TOUCH, 1);
	input_report_abs(input, ABS_X, x);
	input_report_abs(input, ABS_Y, y);
	}

	input_sync(input);

	return 0;
	}

	static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
	{
	unsigned char reg_p[3];

	if (sleep) {
	reg_p[0] = 0x00;
	reg_p[1] = 0xff;
	reg_p[2] = 5;
	} else {
	reg_p[0] = 0x10;
	reg_p[1] = 0xff;
	reg_p[2] = 0;
	}

	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
	}

	static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
	{
	struct cy8ctmg110 *tsc = dev_id;

	cy8ctmg110_touch_pos(tsc);

	return IRQ_HANDLED;
	}

	static int cy8ctmg110_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
	struct cy8ctmg110 *ts;
	struct input_dev *input_dev;
	int err;

	/* No pdata no way forward */
	if (pdata == NULL) {
	dev_err(&client->dev, "no pdata\n");
	return -ENODEV;
	}

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_READ_WORD_DATA))
	return -EIO;

	ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ts \|\| !input_dev) {
	err = -ENOMEM;
	goto err_free_mem;
	}

	ts->client = client;
	ts->input = input_dev;
	ts->reset_pin = pdata->reset_pin;
	ts->irq_pin = pdata->irq_pin;

	snprintf(ts->phys, sizeof(ts->phys),
	"%s/input0", dev_name(&client->dev));

	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X,
	CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
	input_set_abs_params(input_dev, ABS_Y,
	CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);

	if (ts->reset_pin) {
	err = gpio_request(ts->reset_pin, NULL);
	if (err) {
	dev_err(&client->dev,
	"Unable to request GPIO pin %d.\n",
	ts->reset_pin);
	goto err_free_mem;
	}
	}

	cy8ctmg110_power(ts, true);
	cy8ctmg110_set_sleepmode(ts, false);

	err = gpio_request(ts->irq_pin, "touch_irq_key");
	if (err < 0) {
	dev_err(&client->dev,
	"Failed to request GPIO %d, error %d\n",
	ts->irq_pin, err);
	goto err_shutoff_device;
	}

	err = gpio_direction_input(ts->irq_pin);
	if (err < 0) {
	dev_err(&client->dev,
	"Failed to configure input direction for GPIO %d, error %d\n",
	ts->irq_pin, err);
	goto err_free_irq_gpio;
	}

	client->irq = gpio_to_irq(ts->irq_pin);
	if (client->irq < 0) {
	err = client->irq;
	dev_err(&client->dev,
	"Unable to get irq number for GPIO %d, error %d\n",
	ts->irq_pin, err);
	goto err_free_irq_gpio;
	}

	err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	"touch_reset_key", ts);
	if (err < 0) {
	dev_err(&client->dev,
	"irq %d busy? error %d\n", client->irq, err);
	goto err_free_irq_gpio;
	}

	err = input_register_device(input_dev);
	if (err)
	goto err_free_irq;

	i2c_set_clientdata(client, ts);
	device_init_wakeup(&client->dev, 1);
	return 0;

	err_free_irq:
	free_irq(client->irq, ts);
	err_free_irq_gpio:
	gpio_free(ts->irq_pin);
	err_shutoff_device:
	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);
	if (ts->reset_pin)
	gpio_free(ts->reset_pin);
	err_free_mem:
	input_free_device(input_dev);
	kfree(ts);
	return err;
	}

	static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
	enable_irq_wake(client->irq);
	else {
	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);
	}
	return 0;
	}

	static int __maybe_unused cy8ctmg110_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (device_may_wakeup(&client->dev))
	disable_irq_wake(client->irq);
	else {
	cy8ctmg110_power(ts, true);
	cy8ctmg110_set_sleepmode(ts, false);
	}
	return 0;
	}

	static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);

	static int cy8ctmg110_remove(struct i2c_client *client)
	{
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);

	free_irq(client->irq, ts);
	input_unregister_device(ts->input);
	gpio_free(ts->irq_pin);
	if (ts->reset_pin)
	gpio_free(ts->reset_pin);
	kfree(ts);

	return 0;
	}

	static const struct i2c_device_id cy8ctmg110_idtable[] = {
	{ CY8CTMG110_DRIVER_NAME, 1 },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);

	static struct i2c_driver cy8ctmg110_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = CY8CTMG110_DRIVER_NAME,
	.pm = &cy8ctmg110_pm,
	},
	.id_table = cy8ctmg110_idtable,
	.probe = cy8ctmg110_probe,
	.remove = cy8ctmg110_remove,
	};

	module_i2c_driver(cy8ctmg110_driver);

	MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
	MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
	MODULE_LICENSE("GPL v2");