[linux-2.6-block.git] / drivers / input / touchscreen / tsc2007.c

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

#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 i2c_client	*client;

	u16			model;
	u16			x_plate_ohms;
	u16			max_rt;
	unsigned long		poll_delay;
	unsigned long		poll_period;

	int			irq;

	wait_queue_head_t	wait;
	bool			stopped;

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

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

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

	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
	tsc2007_xfer(tsc, PWRDOWN);
}

static u32 tsc2007_calculate_pressure(struct tsc2007 *tsc, struct ts_event *tc)
{
	u32 rt = 0;

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

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

	return rt;
}

static bool tsc2007_is_pen_down(struct tsc2007 *ts)
{
	/*
	 * NOTE: We can't rely on the pressure to determine the pen down
	 * state, even though 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
	 * work function by reading the pen signal state (it's a GPIO
	 * and IRQ). Unfortunately such callback is not always available,
	 * in that case we assume that the pen is down and expect caller
	 * to fall back on the pressure reading.
	 */

	if (!ts->get_pendown_state)
		return true;

	return ts->get_pendown_state();
}

static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
{
	struct tsc2007 *ts = handle;
	struct input_dev *input = ts->input;
	struct ts_event tc;
	u32 rt;

	while (!ts->stopped && tsc2007_is_pen_down(ts)) {

		/* pen is down, continue with the measurement */
		tsc2007_read_values(ts, &tc);

		rt = tsc2007_calculate_pressure(ts, &tc);

		if (rt == 0 && !ts->get_pendown_state) {
			/*
			 * If pressure reported is 0 and we don't have
			 * callback to check pendown state, we have to
			 * assume that pen was lifted up.
			 */
			break;
		}

		if (rt <= ts->max_rt) {
			dev_dbg(&ts->client->dev,
				"DOWN point(%4d,%4d), pressure (%4u)\n",
				tc.x, tc.y, rt);

			input_report_key(input, BTN_TOUCH, 1);
			input_report_abs(input, ABS_X, tc.x);
			input_report_abs(input, ABS_Y, tc.y);
			input_report_abs(input, ABS_PRESSURE, rt);

			input_sync(input);

		} else {
			/*
			 * 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.
			 */
			dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
		}

		wait_event_timeout(ts->wait, ts->stopped,
				   msecs_to_jiffies(ts->poll_period));
	}

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

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

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

	return IRQ_HANDLED;
}

static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
{
	struct tsc2007 *ts = handle;

	if (!ts->get_pendown_state || likely(ts->get_pendown_state()))
		return IRQ_WAKE_THREAD;

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

	return IRQ_HANDLED;
}

static void tsc2007_stop(struct tsc2007 *ts)
{
	ts->stopped = true;
	mb();
	wake_up(&ts->wait);

	disable_irq(ts->irq);
}

static int tsc2007_open(struct input_dev *input_dev)
{
	struct tsc2007 *ts = input_get_drvdata(input_dev);
	int err;

	ts->stopped = false;
	mb();

	enable_irq(ts->irq);

	/* Prepare for touch readings - power down ADC and enable PENIRQ */
	err = tsc2007_xfer(ts, PWRDOWN);
	if (err < 0) {
		tsc2007_stop(ts);
		return err;
	}

	return 0;
}

static void tsc2007_close(struct input_dev *input_dev)
{
	struct tsc2007 *ts = input_get_drvdata(input_dev);

	tsc2007_stop(ts);
}

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

	if (!pdata) {
		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;
	ts->irq = client->irq;
	ts->input = input_dev;
	init_waitqueue_head(&ts->wait);

	ts->model             = pdata->model;
	ts->x_plate_ohms      = pdata->x_plate_ohms;
	ts->max_rt            = pdata->max_rt ? : MAX_12BIT;
	ts->poll_delay        = pdata->poll_delay ? : 1;
	ts->poll_period       = pdata->poll_period ? : 1;
	ts->get_pendown_state = pdata->get_pendown_state;
	ts->clear_penirq      = pdata->clear_penirq;

	if (pdata->x_plate_ohms == 0) {
		dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
		err = -EINVAL;
		goto err_free_mem;
	}

	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->open = tsc2007_open;
	input_dev->close = tsc2007_close;

	input_set_drvdata(input_dev, ts);

	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, pdata->fuzzx, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, pdata->fuzzy, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
			pdata->fuzzz, 0);

	if (pdata->init_platform_hw)
		pdata->init_platform_hw();

	err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq,
				   IRQF_ONESHOT, client->dev.driver->name, ts);
	if (err < 0) {
		dev_err(&client->dev, "irq %d busy?\n", ts->irq);
		goto err_free_mem;
	}

	tsc2007_stop(ts);

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

	i2c_set_clientdata(client, ts);

	return 0;

 err_free_irq:
	free_irq(ts->irq, ts);
	if (pdata->exit_platform_hw)
		pdata->exit_platform_hw();
 err_free_mem:
	input_free_device(input_dev);
	kfree(ts);
	return err;
}

static int __devexit tsc2007_remove(struct i2c_client *client)
{
	struct tsc2007	*ts = i2c_get_clientdata(client);
	struct tsc2007_platform_data *pdata = client->dev.platform_data;

	free_irq(ts->irq, ts);

	if (pdata->exit_platform_hw)
		pdata->exit_platform_hw();

	input_unregister_device(ts->input);
	kfree(ts);

	return 0;
}

static const 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,
};

module_i2c_driver(tsc2007_driver);

MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
50b6f1f4 KL	1	/*
	2	* drivers/input/touchscreen/tsc2007.c
	3	*
	4	* Copyright (c) 2008 MtekVision Co., Ltd.
	5	* Kwangwoo Lee <kwlee@mtekvision.com>
	6	*
	7	* Using code from:
	8	* - ads7846.c
	9	* Copyright (c) 2005 David Brownell
	10	* Copyright (c) 2006 Nokia Corporation
	11	* - corgi_ts.c
	12	* Copyright (C) 2004-2005 Richard Purdie
	13	* - omap_ts.[hc], ads7846.h, ts_osk.c
	14	* Copyright (C) 2002 MontaVista Software
	15	* Copyright (C) 2004 Texas Instruments
	16	* Copyright (C) 2005 Dirk Behme
	17	*
	18	* This program is free software; you can redistribute it and/or modify
	19	* it under the terms of the GNU General Public License version 2 as
	20	* published by the Free Software Foundation.
	21	*/
	22
	23	#include <linux/module.h>
50b6f1f4 KL	24	#include <linux/slab.h>
	25	#include <linux/input.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/i2c.h>
	28	#include <linux/i2c/tsc2007.h>
	29
50b6f1f4 KL	30	#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
	31	#define TSC2007_MEASURE_AUX (0x2 << 4)
	32	#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
	33	#define TSC2007_ACTIVATE_XN (0x8 << 4)
	34	#define TSC2007_ACTIVATE_YN (0x9 << 4)
	35	#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
	36	#define TSC2007_SETUP (0xb << 4)
	37	#define TSC2007_MEASURE_X (0xc << 4)
	38	#define TSC2007_MEASURE_Y (0xd << 4)
	39	#define TSC2007_MEASURE_Z1 (0xe << 4)
	40	#define TSC2007_MEASURE_Z2 (0xf << 4)
	41
	42	#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
	43	#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
	44	#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
	45	#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
	46
	47	#define TSC2007_12BIT (0x0 << 1)
	48	#define TSC2007_8BIT (0x1 << 1)
	49
	50	#define MAX_12BIT ((1 << 12) - 1)
	51
	52	#define ADC_ON_12BIT (TSC2007_12BIT \| TSC2007_ADC_ON_IRQ_DIS0)
	53
	54	#define READ_Y (ADC_ON_12BIT \| TSC2007_MEASURE_Y)
	55	#define READ_Z1 (ADC_ON_12BIT \| TSC2007_MEASURE_Z1)
	56	#define READ_Z2 (ADC_ON_12BIT \| TSC2007_MEASURE_Z2)
	57	#define READ_X (ADC_ON_12BIT \| TSC2007_MEASURE_X)
	58	#define PWRDOWN (TSC2007_12BIT \| TSC2007_POWER_OFF_IRQ_EN)
	59
	60	struct ts_event {
	61	u16 x;
	62	u16 y;
	63	u16 z1, z2;
	64	};
	65
	66	struct tsc2007 {
	67	struct input_dev *input;
	68	char phys[32];
50b6f1f4 KL	69
	70	struct i2c_client *client;
	71
50b6f1f4 KL	72	u16 model;
50b6f1f4 KL	73	u16 x_plate_ohms;
84005eb5	74	u16 max_rt;
2d137c7e	75	unsigned long poll_delay;
1af38eac	76	unsigned long poll_period;
50b6f1f4	77
50b6f1f4 KL	78	int irq;
50b6f1f4 KL	79
377dc553 DT	80	wait_queue_head_t wait;
	81	bool stopped;
	82
50b6f1f4 KL	83	int (*get_pendown_state)(void);
	84	void (*clear_penirq)(void);
	85	};
	86
	87	static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
	88	{
	89	s32 data;
	90	u16 val;
	91
	92	data = i2c_smbus_read_word_data(tsc->client, cmd);
	93	if (data < 0) {
	94	dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
	95	return data;
	96	}
	97
	98	/* The protocol and raw data format from i2c interface:
	99	* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
	100	* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 \| Dummy 4bit].
	101	*/
	102	val = swab16(data) >> 4;
	103
	104	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
	105
	106	return val;
	107	}
	108
d570e9ef	109	static void tsc2007_read_values(struct tsc2007 tsc, struct ts_event tc)
50b6f1f4	110	{
d570e9ef DT	111	/* y- still on; turn on only y+ (and ADC) */
	112	tc->y = tsc2007_xfer(tsc, READ_Y);
	113
	114	/* turn y- off, x+ on, then leave in lowpower */
	115	tc->x = tsc2007_xfer(tsc, READ_X);
	116
	117	/* turn y+ off, x- on; we'll use formula #1 */
	118	tc->z1 = tsc2007_xfer(tsc, READ_Z1);
	119	tc->z2 = tsc2007_xfer(tsc, READ_Z2);
	120
	121	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
	122	tsc2007_xfer(tsc, PWRDOWN);
	123	}
50b6f1f4	124
d570e9ef DT	125	static u32 tsc2007_calculate_pressure(struct tsc2007 tsc, struct ts_event tc)
	126	{
	127	u32 rt = 0;
50b6f1f4 KL	128
50b6f1f4 KL	129	/* range filtering */
d570e9ef DT	130	if (tc->x == MAX_12BIT)
d570e9ef DT	131	tc->x = 0;
50b6f1f4	132
d570e9ef	133	if (likely(tc->x && tc->z1)) {
50b6f1f4	134	/* compute touch pressure resistance using equation #1 */
d570e9ef DT	135	rt = tc->z2 - tc->z1;
	136	rt *= tc->x;
	137	rt *= tsc->x_plate_ohms;
	138	rt /= tc->z1;
50b6f1f4	139	rt = (rt + 2047) >> 12;
50b6f1f4 KL	140	}
50b6f1f4 KL	141
d570e9ef DT	142	return rt;
	143	}
	144
377dc553	145	static bool tsc2007_is_pen_down(struct tsc2007 *ts)
d570e9ef	146	{
141586bc DT	147	/*
141586bc DT	148	* NOTE: We can't rely on the pressure to determine the pen down
d570e9ef DT	149	* state, even though this controller has a pressure sensor.
	150	* The pressure value can fluctuate for quite a while after
	151	* lifting the pen and in some cases may not even settle at the
	152	* expected value.
50b6f1f4 KL	153	*
50b6f1f4 KL	154	* The only safe way to check for the pen up condition is in the
d570e9ef DT	155	* work function by reading the pen signal state (it's a GPIO
d570e9ef DT	156	* and IRQ). Unfortunately such callback is not always available,
377dc553 DT	157	* in that case we assume that the pen is down and expect caller
377dc553 DT	158	* to fall back on the pressure reading.
50b6f1f4	159	*/
d570e9ef	160
377dc553 DT	161	if (!ts->get_pendown_state)
377dc553 DT	162	return true;
d570e9ef	163
377dc553 DT	164	return ts->get_pendown_state();
377dc553 DT	165	}
d570e9ef	166
377dc553 DT	167	static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
	168	{
	169	struct tsc2007 *ts = handle;
	170	struct input_dev *input = ts->input;
	171	struct ts_event tc;
	172	u32 rt;
d570e9ef	173
377dc553 DT	174	while (!ts->stopped && tsc2007_is_pen_down(ts)) {
	175
	176	/* pen is down, continue with the measurement */
	177	tsc2007_read_values(ts, &tc);
d570e9ef	178
377dc553	179	rt = tsc2007_calculate_pressure(ts, &tc);
50b6f1f4	180
377dc553 DT	181	if (rt == 0 && !ts->get_pendown_state) {
	182	/*
	183	* If pressure reported is 0 and we don't have
	184	* callback to check pendown state, we have to
	185	* assume that pen was lifted up.
	186	*/
	187	break;
	188	}
	189
	190	if (rt <= ts->max_rt) {
	191	dev_dbg(&ts->client->dev,
	192	"DOWN point(%4d,%4d), pressure (%4u)\n",
	193	tc.x, tc.y, rt);
50b6f1f4 KL	194
50b6f1f4 KL	195	input_report_key(input, BTN_TOUCH, 1);
377dc553 DT	196	input_report_abs(input, ABS_X, tc.x);
	197	input_report_abs(input, ABS_Y, tc.y);
	198	input_report_abs(input, ABS_PRESSURE, rt);
	199
	200	input_sync(input);
	201
	202	} else {
	203	/*
	204	* Sample found inconsistent by debouncing or pressure is
	205	* beyond the maximum. Don't report it to user space,
	206	* repeat at least once more the measurement.
	207	*/
	208	dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
50b6f1f4 KL	209	}
50b6f1f4 KL	210
377dc553 DT	211	wait_event_timeout(ts->wait, ts->stopped,
	212	msecs_to_jiffies(ts->poll_period));
	213	}
50b6f1f4	214
377dc553	215	dev_dbg(&ts->client->dev, "UP\n");
50b6f1f4	216
377dc553 DT	217	input_report_key(input, BTN_TOUCH, 0);
	218	input_report_abs(input, ABS_PRESSURE, 0);
	219	input_sync(input);
50b6f1f4	220
377dc553 DT	221	if (ts->clear_penirq)
377dc553 DT	222	ts->clear_penirq();
141586bc	223
377dc553	224	return IRQ_HANDLED;
50b6f1f4 KL	225	}
50b6f1f4 KL	226
377dc553	227	static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
50b6f1f4 KL	228	{
50b6f1f4 KL	229	struct tsc2007 *ts = handle;
50b6f1f4	230
377dc553 DT	231	if (!ts->get_pendown_state \|\| likely(ts->get_pendown_state()))
377dc553 DT	232	return IRQ_WAKE_THREAD;
50b6f1f4 KL	233
	234	if (ts->clear_penirq)
	235	ts->clear_penirq();
	236
50b6f1f4 KL	237	return IRQ_HANDLED;
	238	}
	239
d3654d7e	240	static void tsc2007_stop(struct tsc2007 *ts)
141586bc	241	{
377dc553 DT	242	ts->stopped = true;
	243	mb();
	244	wake_up(&ts->wait);
d3654d7e DT	245
	246	disable_irq(ts->irq);
	247	}
	248
	249	static int tsc2007_open(struct input_dev *input_dev)
	250	{
	251	struct tsc2007 *ts = input_get_drvdata(input_dev);
	252	int err;
	253
	254	ts->stopped = false;
	255	mb();
	256
	257	enable_irq(ts->irq);
	258
	259	/* Prepare for touch readings - power down ADC and enable PENIRQ */
	260	err = tsc2007_xfer(ts, PWRDOWN);
	261	if (err < 0) {
	262	tsc2007_stop(ts);
	263	return err;
	264	}
	265
	266	return 0;
	267	}
	268
	269	static void tsc2007_close(struct input_dev *input_dev)
	270	{
	271	struct tsc2007 *ts = input_get_drvdata(input_dev);
	272
	273	tsc2007_stop(ts);
141586bc DT	274	}
	275
	276	static int __devinit tsc2007_probe(struct i2c_client *client,
	277	const struct i2c_device_id *id)
50b6f1f4 KL	278	{
50b6f1f4 KL	279	struct tsc2007 *ts;
b496acb7	280	struct tsc2007_platform_data *pdata = client->dev.platform_data;
50b6f1f4 KL	281	struct input_dev *input_dev;
	282	int err;
	283
d570e9ef	284	if (!pdata) {
50b6f1f4 KL	285	dev_err(&client->dev, "platform data is required!\n");
	286	return -EINVAL;
	287	}
	288
	289	if (!i2c_check_functionality(client->adapter,
	290	I2C_FUNC_SMBUS_READ_WORD_DATA))
	291	return -EIO;
	292
	293	ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
	294	input_dev = input_allocate_device();
	295	if (!ts \|\| !input_dev) {
	296	err = -ENOMEM;
	297	goto err_free_mem;
	298	}
	299
	300	ts->client = client;
141586bc	301	ts->irq = client->irq;
50b6f1f4	302	ts->input = input_dev;
377dc553	303	init_waitqueue_head(&ts->wait);
50b6f1f4	304
50b6f1f4 KL	305	ts->model = pdata->model;
50b6f1f4 KL	306	ts->x_plate_ohms = pdata->x_plate_ohms;
84005eb5	307	ts->max_rt = pdata->max_rt ? : MAX_12BIT;
2d137c7e	308	ts->poll_delay = pdata->poll_delay ? : 1;
1af38eac	309	ts->poll_period = pdata->poll_period ? : 1;
50b6f1f4 KL	310	ts->get_pendown_state = pdata->get_pendown_state;
	311	ts->clear_penirq = pdata->clear_penirq;
	312
341deefe PR	313	if (pdata->x_plate_ohms == 0) {
	314	dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
	315	err = -EINVAL;
	316	goto err_free_mem;
	317	}
	318
4e8718a1 KS	319	snprintf(ts->phys, sizeof(ts->phys),
4e8718a1 KS	320	"%s/input0", dev_name(&client->dev));
50b6f1f4 KL	321
	322	input_dev->name = "TSC2007 Touchscreen";
	323	input_dev->phys = ts->phys;
	324	input_dev->id.bustype = BUS_I2C;
	325
d3654d7e DT	326	input_dev->open = tsc2007_open;
	327	input_dev->close = tsc2007_close;
	328
	329	input_set_drvdata(input_dev, ts);
	330
50b6f1f4 KL	331	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	332	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	333
891e376b TR	334	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, pdata->fuzzx, 0);
	335	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, pdata->fuzzy, 0);
	336	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
	337	pdata->fuzzz, 0);
50b6f1f4	338
cad065fd RR	339	if (pdata->init_platform_hw)
cad065fd RR	340	pdata->init_platform_hw();
75fba3b0	341
377dc553 DT	342	err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq,
377dc553 DT	343	IRQF_ONESHOT, client->dev.driver->name, ts);
50b6f1f4 KL	344	if (err < 0) {
	345	dev_err(&client->dev, "irq %d busy?\n", ts->irq);
	346	goto err_free_mem;
	347	}
	348
d3654d7e	349	tsc2007_stop(ts);
cf5f439b	350
50b6f1f4 KL	351	err = input_register_device(input_dev);
	352	if (err)
	353	goto err_free_irq;
	354
141586bc DT	355	i2c_set_clientdata(client, ts);
141586bc DT	356
50b6f1f4 KL	357	return 0;
	358
	359	err_free_irq:
d3654d7e	360	free_irq(ts->irq, ts);
cad065fd RR	361	if (pdata->exit_platform_hw)
cad065fd RR	362	pdata->exit_platform_hw();
50b6f1f4 KL	363	err_free_mem:
	364	input_free_device(input_dev);
	365	kfree(ts);
	366	return err;
	367	}
	368
141586bc	369	static int __devexit tsc2007_remove(struct i2c_client *client)
50b6f1f4 KL	370	{
50b6f1f4 KL	371	struct tsc2007 *ts = i2c_get_clientdata(client);
141586bc	372	struct tsc2007_platform_data *pdata = client->dev.platform_data;
50b6f1f4	373
d3654d7e	374	free_irq(ts->irq, ts);
75fba3b0	375
cad065fd RR	376	if (pdata->exit_platform_hw)
cad065fd RR	377	pdata->exit_platform_hw();
50b6f1f4	378
50b6f1f4 KL	379	input_unregister_device(ts->input);
	380	kfree(ts);
	381
	382	return 0;
	383	}
	384
ce7b39a1	385	static const struct i2c_device_id tsc2007_idtable[] = {
50b6f1f4 KL	386	{ "tsc2007", 0 },
	387	{ }
	388	};
	389
	390	MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
	391
	392	static struct i2c_driver tsc2007_driver = {
	393	.driver = {
	394	.owner = THIS_MODULE,
	395	.name = "tsc2007"
	396	},
	397	.id_table = tsc2007_idtable,
	398	.probe = tsc2007_probe,
1cb0aa88	399	.remove = tsc2007_remove,
50b6f1f4 KL	400	};
50b6f1f4 KL	401
1b92c1cf	402	module_i2c_driver(tsc2007_driver);
50b6f1f4 KL	403
	404	MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
	405	MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
	406	MODULE_LICENSE("GPL");