drivers/input/touchscreen/tsc2007.c - kernel/windcharger - Git at Google

 /*
  * drivers/input/touchscreen/tsc2007.c
  *
  * Copyright (c) 2008 MtekVision Co., Ltd.
  *	Kwangwoo Lee <kwlee@mtekvision.com>
  *
  * Using code from:
  *  - ads7846.c
  *	Copyright (c) 2005 David Brownell
  *	Copyright (c) 2006 Nokia Corporation
  *  - corgi_ts.c
  *	Copyright (C) 2004-2005 Richard Purdie
  *  - omap_ts.[hc], ads7846.h, ts_osk.c
  *	Copyright (C) 2002 MontaVista Software
  *	Copyright (C) 2004 Texas Instruments
  *	Copyright (C) 2005 Dirk Behme
  *
  *  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.
  */

 #include <linux/module.h>
 #include <linux/hrtimer.h>
 #include <linux/slab.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
 #include <linux/i2c/tsc2007.h>

 #define TS_POLL_DELAY	(10 * 1000)	/* ns delay before the first sample */
 #define TS_POLL_PERIOD	(5 * 1000)	/* ns delay between samples */

 #define TSC2007_MEASURE_TEMP0		(0x0 << 4)
 #define TSC2007_MEASURE_AUX		(0x2 << 4)
 #define TSC2007_MEASURE_TEMP1		(0x4 << 4)
 #define TSC2007_ACTIVATE_XN		(0x8 << 4)
 #define TSC2007_ACTIVATE_YN		(0x9 << 4)
 #define TSC2007_ACTIVATE_YP_XN		(0xa << 4)
 #define TSC2007_SETUP			(0xb << 4)
 #define TSC2007_MEASURE_X		(0xc << 4)
 #define TSC2007_MEASURE_Y		(0xd << 4)
 #define TSC2007_MEASURE_Z1		(0xe << 4)
 #define TSC2007_MEASURE_Z2		(0xf << 4)

 #define TSC2007_POWER_OFF_IRQ_EN	(0x0 << 2)
 #define TSC2007_ADC_ON_IRQ_DIS0		(0x1 << 2)
 #define TSC2007_ADC_OFF_IRQ_EN		(0x2 << 2)
 #define TSC2007_ADC_ON_IRQ_DIS1		(0x3 << 2)

 #define TSC2007_12BIT			(0x0 << 1)
 #define TSC2007_8BIT			(0x1 << 1)

 #define	MAX_12BIT			((1 << 12) - 1)

 #define ADC_ON_12BIT	(TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)

 #define READ_Y		(ADC_ON_12BIT | TSC2007_MEASURE_Y)
 #define READ_Z1		(ADC_ON_12BIT | TSC2007_MEASURE_Z1)
 #define READ_Z2		(ADC_ON_12BIT | TSC2007_MEASURE_Z2)
 #define READ_X		(ADC_ON_12BIT | TSC2007_MEASURE_X)
 #define PWRDOWN		(TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)

 struct ts_event {
 	u16	x;
 	u16	y;
 	u16	z1, z2;
 };

 struct tsc2007 {
 	struct input_dev	*input;
 	char			phys[32];
 	struct hrtimer		timer;
 	struct ts_event		tc;

 	struct i2c_client	*client;

 	spinlock_t		lock;

 	u16			model;
 	u16			x_plate_ohms;

 	unsigned		pendown;
 	int			irq;

 	int			(*get_pendown_state)(void);
 	void			(*clear_penirq)(void);
 };

 static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
 {
 	s32 data;
 	u16 val;

 	data = i2c_smbus_read_word_data(tsc->client, cmd);
 	if (data < 0) {
 		dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
 		return data;
 	}

 	/* The protocol and raw data format from i2c interface:
 	 * S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
 	 * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
 	 */
 	val = swab16(data) >> 4;

 	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);

 	return val;
 }

 static void tsc2007_send_event(void *tsc)
 {
 	struct tsc2007	*ts = tsc;
 	u32		rt;
 	u16		x, y, z1, z2;

 	x = ts->tc.x;
 	y = ts->tc.y;
 	z1 = ts->tc.z1;
 	z2 = ts->tc.z2;

 	/* range filtering */
 	if (x == MAX_12BIT)
 		x = 0;

 	if (likely(x && z1)) {
 		/* compute touch pressure resistance using equation #1 */
 		rt = z2;
 		rt -= z1;
 		rt *= x;
 		rt *= ts->x_plate_ohms;
 		rt /= z1;
 		rt = (rt + 2047) >> 12;
 	} else
 		rt = 0;

 	/* Sample found inconsistent by debouncing or pressure is beyond
 	 * the maximum. Don't report it to user space, repeat at least
 	 * once more the measurement
 	 */
 	if (rt > MAX_12BIT) {
 		dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);

 		hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 			      HRTIMER_MODE_REL);
 		return;
 	}

 	/* NOTE: We can't rely on the pressure to determine the pen down
 	 * state, even this controller has a pressure sensor.  The pressure
 	 * value can fluctuate for quite a while after lifting the pen and
 	 * in some cases may not even settle at the expected value.
 	 *
 	 * The only safe way to check for the pen up condition is in the
 	 * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 	 */
 	if (rt) {
 		struct input_dev *input = ts->input;

 		if (!ts->pendown) {
 			dev_dbg(&ts->client->dev, "DOWN\n");

 			input_report_key(input, BTN_TOUCH, 1);
 			ts->pendown = 1;
 		}

 		input_report_abs(input, ABS_X, x);
 		input_report_abs(input, ABS_Y, y);
 		input_report_abs(input, ABS_PRESSURE, rt);

 		input_sync(input);

 		dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n",
 			x, y, rt);
 	}

 	hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 			HRTIMER_MODE_REL);
 }

 static int tsc2007_read_values(struct tsc2007 *tsc)
 {
 	/* y- still on; turn on only y+ (and ADC) */
 	tsc->tc.y = tsc2007_xfer(tsc, READ_Y);

 	/* turn y- off, x+ on, then leave in lowpower */
 	tsc->tc.x = tsc2007_xfer(tsc, READ_X);

 	/* turn y+ off, x- on; we'll use formula #1 */
 	tsc->tc.z1 = tsc2007_xfer(tsc, READ_Z1);
 	tsc->tc.z2 = tsc2007_xfer(tsc, READ_Z2);

 	/* power down */
 	tsc2007_xfer(tsc, PWRDOWN);

 	return 0;
 }

 static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle)
 {
 	struct tsc2007 *ts = container_of(handle, struct tsc2007, timer);
 	unsigned long flags;

 	spin_lock_irqsave(&ts->lock, flags);

 	if (unlikely(!ts->get_pendown_state() && ts->pendown)) {
 		struct input_dev *input = ts->input;

 		dev_dbg(&ts->client->dev, "UP\n");

 		input_report_key(input, BTN_TOUCH, 0);
 		input_report_abs(input, ABS_PRESSURE, 0);
 		input_sync(input);

 		ts->pendown = 0;
 		enable_irq(ts->irq);
 	} else {
 		/* pen is still down, continue with the measurement */
 		dev_dbg(&ts->client->dev, "pen is still down\n");

 		tsc2007_read_values(ts);
 		tsc2007_send_event(ts);
 	}

 	spin_unlock_irqrestore(&ts->lock, flags);

 	return HRTIMER_NORESTART;
 }

 static irqreturn_t tsc2007_irq(int irq, void *handle)
 {
 	struct tsc2007 *ts = handle;
 	unsigned long flags;

 	spin_lock_irqsave(&ts->lock, flags);

 	if (likely(ts->get_pendown_state())) {
 		disable_irq_nosync(ts->irq);
 		hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 					HRTIMER_MODE_REL);
 	}

 	if (ts->clear_penirq)
 		ts->clear_penirq();

 	spin_unlock_irqrestore(&ts->lock, flags);

 	return IRQ_HANDLED;
 }

 static int tsc2007_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct tsc2007 *ts;
 	struct tsc2007_platform_data *pdata = pdata = client->dev.platform_data;
 	struct input_dev *input_dev;
 	int err;

 	if (!pdata || !pdata->get_pendown_state) {
 		dev_err(&client->dev, "platform data is required!\n");
 		return -EINVAL;
 	}

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

 	ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!ts || !input_dev) {
 		err = -ENOMEM;
 		goto err_free_mem;
 	}

 	ts->client = client;
 	i2c_set_clientdata(client, ts);

 	ts->input = input_dev;

 	hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	ts->timer.function = tsc2007_timer;

 	spin_lock_init(&ts->lock);

 	ts->model             = pdata->model;
 	ts->x_plate_ohms      = pdata->x_plate_ohms;
 	ts->get_pendown_state = pdata->get_pendown_state;
 	ts->clear_penirq      = pdata->clear_penirq;

 	pdata->init_platform_hw();

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

 	input_dev->name = "TSC2007 Touchscreen";
 	input_dev->phys = ts->phys;
 	input_dev->id.bustype = BUS_I2C;

 	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, 0, MAX_12BIT, 0, 0);
 	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
 	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);

 	tsc2007_read_values(ts);

 	ts->irq = client->irq;

 	err = request_irq(ts->irq, tsc2007_irq, 0,
 			client->dev.driver->name, ts);
 	if (err < 0) {
 		dev_err(&client->dev, "irq %d busy?\n", ts->irq);
 		goto err_free_mem;
 	}

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

 	dev_info(&client->dev, "registered with irq (%d)\n", ts->irq);

 	return 0;

  err_free_irq:
 	free_irq(ts->irq, ts);
 	hrtimer_cancel(&ts->timer);
  err_free_mem:
 	input_free_device(input_dev);
 	kfree(ts);
 	return err;
 }

 static int tsc2007_remove(struct i2c_client *client)
 {
 	struct tsc2007	*ts = i2c_get_clientdata(client);
 	struct tsc2007_platform_data *pdata;

 	pdata = client->dev.platform_data;
 	pdata->exit_platform_hw();

 	free_irq(ts->irq, ts);
 	hrtimer_cancel(&ts->timer);
 	input_unregister_device(ts->input);
 	kfree(ts);

 	return 0;
 }

 static struct i2c_device_id tsc2007_idtable[] = {
 	{ "tsc2007", 0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);

 static struct i2c_driver tsc2007_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "tsc2007"
 	},
 	.id_table	= tsc2007_idtable,
 	.probe		= tsc2007_probe,
 	.remove		= tsc2007_remove,
 };

 static int __init tsc2007_init(void)
 {
 	return i2c_add_driver(&tsc2007_driver);
 }

 static void __exit tsc2007_exit(void)
 {
 	i2c_del_driver(&tsc2007_driver);
 }

 module_init(tsc2007_init);
 module_exit(tsc2007_exit);

 MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
 MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
 MODULE_LICENSE("GPL");
	/*
	* drivers/input/touchscreen/tsc2007.c
	*
	* Copyright (c) 2008 MtekVision Co., Ltd.
	* Kwangwoo Lee <kwlee@mtekvision.com>
	*
	* Using code from:
	* - ads7846.c
	* Copyright (c) 2005 David Brownell
	* Copyright (c) 2006 Nokia Corporation
	* - corgi_ts.c
	* Copyright (C) 2004-2005 Richard Purdie
	* - omap_ts.[hc], ads7846.h, ts_osk.c
	* Copyright (C) 2002 MontaVista Software
	* Copyright (C) 2004 Texas Instruments
	* Copyright (C) 2005 Dirk Behme
	*
	* 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.
	*/

	#include <linux/module.h>
	#include <linux/hrtimer.h>
	#include <linux/slab.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/i2c.h>
	#include <linux/i2c/tsc2007.h>

	#define TS_POLL_DELAY (10 * 1000) /* ns delay before the first sample */
	#define TS_POLL_PERIOD (5 * 1000) /* ns delay between samples */

	#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
	#define TSC2007_MEASURE_AUX (0x2 << 4)
	#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
	#define TSC2007_ACTIVATE_XN (0x8 << 4)
	#define TSC2007_ACTIVATE_YN (0x9 << 4)
	#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
	#define TSC2007_SETUP (0xb << 4)
	#define TSC2007_MEASURE_X (0xc << 4)
	#define TSC2007_MEASURE_Y (0xd << 4)
	#define TSC2007_MEASURE_Z1 (0xe << 4)
	#define TSC2007_MEASURE_Z2 (0xf << 4)

	#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
	#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
	#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
	#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)

	#define TSC2007_12BIT (0x0 << 1)
	#define TSC2007_8BIT (0x1 << 1)

	#define MAX_12BIT ((1 << 12) - 1)

	#define ADC_ON_12BIT (TSC2007_12BIT \| TSC2007_ADC_ON_IRQ_DIS0)

	#define READ_Y (ADC_ON_12BIT \| TSC2007_MEASURE_Y)
	#define READ_Z1 (ADC_ON_12BIT \| TSC2007_MEASURE_Z1)
	#define READ_Z2 (ADC_ON_12BIT \| TSC2007_MEASURE_Z2)
	#define READ_X (ADC_ON_12BIT \| TSC2007_MEASURE_X)
	#define PWRDOWN (TSC2007_12BIT \| TSC2007_POWER_OFF_IRQ_EN)

	struct ts_event {
	u16 x;
	u16 y;
	u16 z1, z2;
	};

	struct tsc2007 {
	struct input_dev *input;
	char phys[32];
	struct hrtimer timer;
	struct ts_event tc;

	struct i2c_client *client;

	spinlock_t lock;

	u16 model;
	u16 x_plate_ohms;

	unsigned pendown;
	int irq;

	int (*get_pendown_state)(void);
	void (*clear_penirq)(void);
	};

	static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
	{
	s32 data;
	u16 val;

	data = i2c_smbus_read_word_data(tsc->client, cmd);
	if (data < 0) {
	dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
	return data;
	}

	/* The protocol and raw data format from i2c interface:
	* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
	* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 \| Dummy 4bit].
	*/
	val = swab16(data) >> 4;

	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);

	return val;
	}

	static void tsc2007_send_event(void *tsc)
	{
	struct tsc2007 *ts = tsc;
	u32 rt;
	u16 x, y, z1, z2;

	x = ts->tc.x;
	y = ts->tc.y;
	z1 = ts->tc.z1;
	z2 = ts->tc.z2;

	/* range filtering */
	if (x == MAX_12BIT)
	x = 0;

	if (likely(x && z1)) {
	/* compute touch pressure resistance using equation #1 */
	rt = z2;
	rt -= z1;
	rt *= x;
	rt *= ts->x_plate_ohms;
	rt /= z1;
	rt = (rt + 2047) >> 12;
	} else
	rt = 0;

	/* Sample found inconsistent by debouncing or pressure is beyond
	* the maximum. Don't report it to user space, repeat at least
	* once more the measurement
	*/
	if (rt > MAX_12BIT) {
	dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);

	hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
	HRTIMER_MODE_REL);
	return;
	}

	/* NOTE: We can't rely on the pressure to determine the pen down
	* state, even this controller has a pressure sensor. The pressure
	* value can fluctuate for quite a while after lifting the pen and
	* in some cases may not even settle at the expected value.
	*
	* The only safe way to check for the pen up condition is in the
	* timer by reading the pen signal state (it's a GPIO _and_ IRQ).
	*/
	if (rt) {
	struct input_dev *input = ts->input;

	if (!ts->pendown) {
	dev_dbg(&ts->client->dev, "DOWN\n");

	input_report_key(input, BTN_TOUCH, 1);
	ts->pendown = 1;
	}

	input_report_abs(input, ABS_X, x);
	input_report_abs(input, ABS_Y, y);
	input_report_abs(input, ABS_PRESSURE, rt);

	input_sync(input);

	dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n",
	x, y, rt);
	}

	hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
	HRTIMER_MODE_REL);
	}

	static int tsc2007_read_values(struct tsc2007 *tsc)
	{
	/* y- still on; turn on only y+ (and ADC) */
	tsc->tc.y = tsc2007_xfer(tsc, READ_Y);

	/* turn y- off, x+ on, then leave in lowpower */
	tsc->tc.x = tsc2007_xfer(tsc, READ_X);

	/* turn y+ off, x- on; we'll use formula #1 */
	tsc->tc.z1 = tsc2007_xfer(tsc, READ_Z1);
	tsc->tc.z2 = tsc2007_xfer(tsc, READ_Z2);

	/* power down */
	tsc2007_xfer(tsc, PWRDOWN);

	return 0;
	}

	static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle)
	{
	struct tsc2007 *ts = container_of(handle, struct tsc2007, timer);
	unsigned long flags;

	spin_lock_irqsave(&ts->lock, flags);

	if (unlikely(!ts->get_pendown_state() && ts->pendown)) {
	struct input_dev *input = ts->input;

	dev_dbg(&ts->client->dev, "UP\n");

	input_report_key(input, BTN_TOUCH, 0);
	input_report_abs(input, ABS_PRESSURE, 0);
	input_sync(input);

	ts->pendown = 0;
	enable_irq(ts->irq);
	} else {
	/* pen is still down, continue with the measurement */
	dev_dbg(&ts->client->dev, "pen is still down\n");

	tsc2007_read_values(ts);
	tsc2007_send_event(ts);
	}

	spin_unlock_irqrestore(&ts->lock, flags);

	return HRTIMER_NORESTART;
	}

	static irqreturn_t tsc2007_irq(int irq, void *handle)
	{
	struct tsc2007 *ts = handle;
	unsigned long flags;

	spin_lock_irqsave(&ts->lock, flags);

	if (likely(ts->get_pendown_state())) {
	disable_irq_nosync(ts->irq);
	hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
	HRTIMER_MODE_REL);
	}

	if (ts->clear_penirq)
	ts->clear_penirq();

	spin_unlock_irqrestore(&ts->lock, flags);

	return IRQ_HANDLED;
	}

	static int tsc2007_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tsc2007 *ts;
	struct tsc2007_platform_data *pdata = pdata = client->dev.platform_data;
	struct input_dev *input_dev;
	int err;

	if (!pdata \|\| !pdata->get_pendown_state) {
	dev_err(&client->dev, "platform data is required!\n");
	return -EINVAL;
	}

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

	ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ts \|\| !input_dev) {
	err = -ENOMEM;
	goto err_free_mem;
	}

	ts->client = client;
	i2c_set_clientdata(client, ts);

	ts->input = input_dev;

	hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	ts->timer.function = tsc2007_timer;

	spin_lock_init(&ts->lock);

	ts->model = pdata->model;
	ts->x_plate_ohms = pdata->x_plate_ohms;
	ts->get_pendown_state = pdata->get_pendown_state;
	ts->clear_penirq = pdata->clear_penirq;

	pdata->init_platform_hw();

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

	input_dev->name = "TSC2007 Touchscreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_I2C;

	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, 0, MAX_12BIT, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);

	tsc2007_read_values(ts);

	ts->irq = client->irq;

	err = request_irq(ts->irq, tsc2007_irq, 0,
	client->dev.driver->name, ts);
	if (err < 0) {
	dev_err(&client->dev, "irq %d busy?\n", ts->irq);
	goto err_free_mem;
	}

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

	dev_info(&client->dev, "registered with irq (%d)\n", ts->irq);

	return 0;

	err_free_irq:
	free_irq(ts->irq, ts);
	hrtimer_cancel(&ts->timer);
	err_free_mem:
	input_free_device(input_dev);
	kfree(ts);
	return err;
	}

	static int tsc2007_remove(struct i2c_client *client)
	{
	struct tsc2007 *ts = i2c_get_clientdata(client);
	struct tsc2007_platform_data *pdata;

	pdata = client->dev.platform_data;
	pdata->exit_platform_hw();

	free_irq(ts->irq, ts);
	hrtimer_cancel(&ts->timer);
	input_unregister_device(ts->input);
	kfree(ts);

	return 0;
	}

	static struct i2c_device_id tsc2007_idtable[] = {
	{ "tsc2007", 0 },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);

	static struct i2c_driver tsc2007_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "tsc2007"
	},
	.id_table = tsc2007_idtable,
	.probe = tsc2007_probe,
	.remove = tsc2007_remove,
	};

	static int __init tsc2007_init(void)
	{
	return i2c_add_driver(&tsc2007_driver);
	}

	static void __exit tsc2007_exit(void)
	{
	i2c_del_driver(&tsc2007_driver);
	}

	module_init(tsc2007_init);
	module_exit(tsc2007_exit);

	MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
	MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
	MODULE_LICENSE("GPL");