[mirror_ubuntu-eoan-kernel.git] / drivers / input / touchscreen / tsc2007_core.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/of_device.h>
#include <linux/of_gpio.h>
#include <linux/platform_data/tsc2007.h>
#include "tsc2007.h"

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);
}

u32 tsc2007_calculate_resistance(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 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;
}

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(&ts->client->dev);
}

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 */

		mutex_lock(&ts->mlock);
		tsc2007_read_values(ts, &tc);
		mutex_unlock(&ts->mlock);

		rt = tsc2007_calculate_resistance(ts, &tc);

		if (!rt && !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), resistance (%4u)\n",
				tc.x, tc.y, rt);

			rt = ts->max_rt - 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, 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 (tsc2007_is_pen_down(ts))
		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);
}

#ifdef CONFIG_OF
static int tsc2007_get_pendown_state_gpio(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct tsc2007 *ts = i2c_get_clientdata(client);

	return !gpio_get_value(ts->gpio);
}

static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
{
	struct device_node *np = client->dev.of_node;
	u32 val32;
	u64 val64;

	if (!np) {
		dev_err(&client->dev, "missing device tree data\n");
		return -EINVAL;
	}

	if (!of_property_read_u32(np, "ti,max-rt", &val32))
		ts->max_rt = val32;
	else
		ts->max_rt = MAX_12BIT;

	if (!of_property_read_u32(np, "ti,fuzzx", &val32))
		ts->fuzzx = val32;

	if (!of_property_read_u32(np, "ti,fuzzy", &val32))
		ts->fuzzy = val32;

	if (!of_property_read_u32(np, "ti,fuzzz", &val32))
		ts->fuzzz = val32;

	if (!of_property_read_u64(np, "ti,poll-period", &val64))
		ts->poll_period = msecs_to_jiffies(val64);
	else
		ts->poll_period = msecs_to_jiffies(1);

	if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
		ts->x_plate_ohms = val32;
	} else {
		dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
		return -EINVAL;
	}

	ts->gpio = of_get_gpio(np, 0);
	if (gpio_is_valid(ts->gpio))
		ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
	else
		dev_warn(&client->dev,
			 "GPIO not specified in DT (of_get_gpio returned %d)\n",
			 ts->gpio);

	return 0;
}
#else
static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
{
	dev_err(&client->dev, "platform data is required!\n");
	return -EINVAL;
}
#endif

static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts,
			      const struct tsc2007_platform_data *pdata,
			      const struct i2c_device_id *id)
{
	ts->model             = pdata->model;
	ts->x_plate_ohms      = pdata->x_plate_ohms;
	ts->max_rt            = pdata->max_rt ? : MAX_12BIT;
	ts->poll_period       = msecs_to_jiffies(pdata->poll_period ? : 1);
	ts->get_pendown_state = pdata->get_pendown_state;
	ts->clear_penirq      = pdata->clear_penirq;
	ts->fuzzx             = pdata->fuzzx;
	ts->fuzzy             = pdata->fuzzy;
	ts->fuzzz             = pdata->fuzzz;

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

	return 0;
}

static void tsc2007_call_exit_platform_hw(void *data)
{
	struct device *dev = data;
	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);

	pdata->exit_platform_hw();
}

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

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

	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
	if (!ts)
		return -ENOMEM;

	if (pdata)
		err = tsc2007_probe_pdev(client, ts, pdata, id);
	else
		err = tsc2007_probe_dt(client, ts);
	if (err)
		return err;

	input_dev = devm_input_allocate_device(&client->dev);
	if (!input_dev)
		return -ENOMEM;

	i2c_set_clientdata(client, ts);

	ts->client = client;
	ts->irq = client->irq;
	ts->input = input_dev;

	init_waitqueue_head(&ts->wait);
	mutex_init(&ts->mlock);

	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_set_capability(input_dev, EV_KEY, BTN_TOUCH);

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

	if (pdata) {
		if (pdata->exit_platform_hw) {
			err = devm_add_action(&client->dev,
					      tsc2007_call_exit_platform_hw,
					      &client->dev);
			if (err) {
				dev_err(&client->dev,
					"Failed to register exit_platform_hw action, %d\n",
					err);
				return err;
			}
		}

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

	err = devm_request_threaded_irq(&client->dev, ts->irq,
					tsc2007_hard_irq, tsc2007_soft_irq,
					IRQF_ONESHOT,
					client->dev.driver->name, ts);
	if (err) {
		dev_err(&client->dev, "Failed to request irq %d: %d\n",
			ts->irq, err);
		return err;
	}

	tsc2007_stop(ts);

	/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
	err = tsc2007_xfer(ts, PWRDOWN);
	if (err < 0) {
		dev_err(&client->dev,
			"Failed to setup chip: %d\n", err);
		return err;	/* chip does not respond */
	}

	err = input_register_device(input_dev);
	if (err) {
		dev_err(&client->dev,
			"Failed to register input device: %d\n", err);
		return err;
	}

	err =  tsc2007_iio_configure(ts);
	if (err) {
		dev_err(&client->dev,
			"Failed to register with IIO: %d\n", err);
		return err;
	}

	return 0;
}

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

MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);

#ifdef CONFIG_OF
static const struct of_device_id tsc2007_of_match[] = {
	{ .compatible = "ti,tsc2007" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tsc2007_of_match);
#endif

static struct i2c_driver tsc2007_driver = {
	.driver = {
		.name	= "tsc2007",
		.of_match_table = of_match_ptr(tsc2007_of_match),
	},
	.id_table	= tsc2007_idtable,
	.probe		= tsc2007_probe,
};

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>
07f9e5cf	28	#include <linux/of_device.h>
07f9e5cf	29	#include <linux/of_gpio.h>
8fd70815	30	#include <linux/platform_data/tsc2007.h>
f1443404	31	#include "tsc2007.h"
50b6f1f4	32
f1443404	33	int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
50b6f1f4 KL	34	{
	35	s32 data;
	36	u16 val;
	37
	38	data = i2c_smbus_read_word_data(tsc->client, cmd);
	39	if (data < 0) {
	40	dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
	41	return data;
	42	}
	43
	44	/* The protocol and raw data format from i2c interface:
	45	* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
	46	* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 \| Dummy 4bit].
	47	*/
	48	val = swab16(data) >> 4;
	49
	50	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
	51
	52	return val;
	53	}
	54
d570e9ef	55	static void tsc2007_read_values(struct tsc2007 tsc, struct ts_event tc)
50b6f1f4	56	{
d570e9ef DT	57	/* y- still on; turn on only y+ (and ADC) */
	58	tc->y = tsc2007_xfer(tsc, READ_Y);
	59
	60	/* turn y- off, x+ on, then leave in lowpower */
	61	tc->x = tsc2007_xfer(tsc, READ_X);
	62
	63	/* turn y+ off, x- on; we'll use formula #1 */
	64	tc->z1 = tsc2007_xfer(tsc, READ_Z1);
	65	tc->z2 = tsc2007_xfer(tsc, READ_Z2);
	66
	67	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
	68	tsc2007_xfer(tsc, PWRDOWN);
	69	}
50b6f1f4	70
deec586d	71	u32 tsc2007_calculate_resistance(struct tsc2007 tsc, struct ts_event tc)
d570e9ef DT	72	{
d570e9ef DT	73	u32 rt = 0;
50b6f1f4 KL	74
50b6f1f4 KL	75	/* range filtering */
d570e9ef DT	76	if (tc->x == MAX_12BIT)
d570e9ef DT	77	tc->x = 0;
50b6f1f4	78
d570e9ef	79	if (likely(tc->x && tc->z1)) {
deec586d	80	/* compute touch resistance using equation #1 */
d570e9ef DT	81	rt = tc->z2 - tc->z1;
	82	rt *= tc->x;
	83	rt *= tsc->x_plate_ohms;
	84	rt /= tc->z1;
50b6f1f4	85	rt = (rt + 2047) >> 12;
50b6f1f4 KL	86	}
50b6f1f4 KL	87
d570e9ef DT	88	return rt;
	89	}
	90
f1443404	91	bool tsc2007_is_pen_down(struct tsc2007 *ts)
d570e9ef	92	{
141586bc DT	93	/*
141586bc DT	94	* NOTE: We can't rely on the pressure to determine the pen down
d570e9ef DT	95	* state, even though this controller has a pressure sensor.
	96	* The pressure value can fluctuate for quite a while after
	97	* lifting the pen and in some cases may not even settle at the
	98	* expected value.
50b6f1f4 KL	99	*
50b6f1f4 KL	100	* The only safe way to check for the pen up condition is in the
d570e9ef DT	101	* work function by reading the pen signal state (it's a GPIO
d570e9ef DT	102	* and IRQ). Unfortunately such callback is not always available,
377dc553 DT	103	* in that case we assume that the pen is down and expect caller
377dc553 DT	104	* to fall back on the pressure reading.
50b6f1f4	105	*/
d570e9ef	106
377dc553 DT	107	if (!ts->get_pendown_state)
377dc553 DT	108	return true;
d570e9ef	109
07f9e5cf	110	return ts->get_pendown_state(&ts->client->dev);
377dc553	111	}
d570e9ef	112
377dc553 DT	113	static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
	114	{
	115	struct tsc2007 *ts = handle;
	116	struct input_dev *input = ts->input;
	117	struct ts_event tc;
	118	u32 rt;
d570e9ef	119
377dc553 DT	120	while (!ts->stopped && tsc2007_is_pen_down(ts)) {
	121
	122	/* pen is down, continue with the measurement */
f1443404 NS	123
f1443404 NS	124	mutex_lock(&ts->mlock);
377dc553	125	tsc2007_read_values(ts, &tc);
f1443404	126	mutex_unlock(&ts->mlock);
d570e9ef	127
deec586d	128	rt = tsc2007_calculate_resistance(ts, &tc);
50b6f1f4	129
07f9e5cf	130	if (!rt && !ts->get_pendown_state) {
377dc553 DT	131	/*
	132	* If pressure reported is 0 and we don't have
	133	* callback to check pendown state, we have to
	134	* assume that pen was lifted up.
	135	*/
	136	break;
	137	}
	138
	139	if (rt <= ts->max_rt) {
	140	dev_dbg(&ts->client->dev,
deec586d	141	"DOWN point(%4d,%4d), resistance (%4u)\n",
377dc553	142	tc.x, tc.y, rt);
50b6f1f4	143
db4572ff NS	144	rt = ts->max_rt - rt;
db4572ff NS	145
50b6f1f4	146	input_report_key(input, BTN_TOUCH, 1);
377dc553 DT	147	input_report_abs(input, ABS_X, tc.x);
	148	input_report_abs(input, ABS_Y, tc.y);
	149	input_report_abs(input, ABS_PRESSURE, rt);
	150
	151	input_sync(input);
	152
	153	} else {
	154	/*
	155	* Sample found inconsistent by debouncing or pressure is
	156	* beyond the maximum. Don't report it to user space,
	157	* repeat at least once more the measurement.
	158	*/
	159	dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
50b6f1f4 KL	160	}
50b6f1f4 KL	161
bbdb38a2	162	wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);
377dc553	163	}
50b6f1f4	164
377dc553	165	dev_dbg(&ts->client->dev, "UP\n");
50b6f1f4	166
377dc553 DT	167	input_report_key(input, BTN_TOUCH, 0);
	168	input_report_abs(input, ABS_PRESSURE, 0);
	169	input_sync(input);
50b6f1f4	170
377dc553 DT	171	if (ts->clear_penirq)
377dc553 DT	172	ts->clear_penirq();
141586bc	173
377dc553	174	return IRQ_HANDLED;
50b6f1f4 KL	175	}
50b6f1f4 KL	176
377dc553	177	static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
50b6f1f4 KL	178	{
50b6f1f4 KL	179	struct tsc2007 *ts = handle;
50b6f1f4	180
07f9e5cf	181	if (tsc2007_is_pen_down(ts))
377dc553	182	return IRQ_WAKE_THREAD;
50b6f1f4 KL	183
	184	if (ts->clear_penirq)
	185	ts->clear_penirq();
	186
50b6f1f4 KL	187	return IRQ_HANDLED;
	188	}
	189
d3654d7e	190	static void tsc2007_stop(struct tsc2007 *ts)
141586bc	191	{
377dc553 DT	192	ts->stopped = true;
	193	mb();
	194	wake_up(&ts->wait);
d3654d7e DT	195
	196	disable_irq(ts->irq);
	197	}
	198
	199	static int tsc2007_open(struct input_dev *input_dev)
	200	{
	201	struct tsc2007 *ts = input_get_drvdata(input_dev);
	202	int err;
	203
	204	ts->stopped = false;
	205	mb();
	206
	207	enable_irq(ts->irq);
	208
	209	/* Prepare for touch readings - power down ADC and enable PENIRQ */
	210	err = tsc2007_xfer(ts, PWRDOWN);
	211	if (err < 0) {
	212	tsc2007_stop(ts);
	213	return err;
	214	}
	215
	216	return 0;
	217	}
	218
	219	static void tsc2007_close(struct input_dev *input_dev)
	220	{
	221	struct tsc2007 *ts = input_get_drvdata(input_dev);
	222
	223	tsc2007_stop(ts);
141586bc DT	224	}
141586bc DT	225
07f9e5cf DC	226	#ifdef CONFIG_OF
07f9e5cf DC	227	static int tsc2007_get_pendown_state_gpio(struct device *dev)
50b6f1f4	228	{
07f9e5cf DC	229	struct i2c_client *client = to_i2c_client(dev);
	230	struct tsc2007 *ts = i2c_get_clientdata(client);
	231
	232	return !gpio_get_value(ts->gpio);
	233	}
	234
	235	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	236	{
	237	struct device_node *np = client->dev.of_node;
	238	u32 val32;
	239	u64 val64;
50b6f1f4	240
07f9e5cf DC	241	if (!np) {
07f9e5cf DC	242	dev_err(&client->dev, "missing device tree data\n");
50b6f1f4 KL	243	return -EINVAL;
	244	}
	245
07f9e5cf DC	246	if (!of_property_read_u32(np, "ti,max-rt", &val32))
	247	ts->max_rt = val32;
	248	else
	249	ts->max_rt = MAX_12BIT;
50b6f1f4	250
07f9e5cf DC	251	if (!of_property_read_u32(np, "ti,fuzzx", &val32))
	252	ts->fuzzx = val32;
	253
	254	if (!of_property_read_u32(np, "ti,fuzzy", &val32))
	255	ts->fuzzy = val32;
	256
	257	if (!of_property_read_u32(np, "ti,fuzzz", &val32))
	258	ts->fuzzz = val32;
	259
	260	if (!of_property_read_u64(np, "ti,poll-period", &val64))
bbdb38a2	261	ts->poll_period = msecs_to_jiffies(val64);
07f9e5cf	262	else
bbdb38a2	263	ts->poll_period = msecs_to_jiffies(1);
07f9e5cf DC	264
	265	if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
	266	ts->x_plate_ohms = val32;
	267	} else {
	268	dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
	269	return -EINVAL;
50b6f1f4 KL	270	}
50b6f1f4 KL	271
07f9e5cf DC	272	ts->gpio = of_get_gpio(np, 0);
	273	if (gpio_is_valid(ts->gpio))
	274	ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
	275	else
	276	dev_warn(&client->dev,
	277	"GPIO not specified in DT (of_get_gpio returned %d)\n",
	278	ts->gpio);
50b6f1f4	279
07f9e5cf DC	280	return 0;
	281	}
	282	#else
	283	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	284	{
	285	dev_err(&client->dev, "platform data is required!\n");
	286	return -EINVAL;
	287	}
	288	#endif
	289
	290	static int tsc2007_probe_pdev(struct i2c_client client, struct tsc2007 ts,
	291	const struct tsc2007_platform_data *pdata,
	292	const struct i2c_device_id *id)
	293	{
50b6f1f4 KL	294	ts->model = pdata->model;
50b6f1f4 KL	295	ts->x_plate_ohms = pdata->x_plate_ohms;
84005eb5	296	ts->max_rt = pdata->max_rt ? : MAX_12BIT;
bbdb38a2	297	ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1);
50b6f1f4 KL	298	ts->get_pendown_state = pdata->get_pendown_state;
50b6f1f4 KL	299	ts->clear_penirq = pdata->clear_penirq;
07f9e5cf DC	300	ts->fuzzx = pdata->fuzzx;
	301	ts->fuzzy = pdata->fuzzy;
	302	ts->fuzzz = pdata->fuzzz;
50b6f1f4	303
341deefe PR	304	if (pdata->x_plate_ohms == 0) {
341deefe PR	305	dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
07f9e5cf	306	return -EINVAL;
341deefe PR	307	}
341deefe PR	308
07f9e5cf DC	309	return 0;
	310	}
	311
fd91a5f0 DT	312	static void tsc2007_call_exit_platform_hw(void *data)
	313	{
	314	struct device *dev = data;
	315	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
	316
	317	pdata->exit_platform_hw();
	318	}
	319
07f9e5cf DC	320	static int tsc2007_probe(struct i2c_client *client,
	321	const struct i2c_device_id *id)
	322	{
f1443404 NS	323	const struct tsc2007_platform_data *pdata =
f1443404 NS	324	dev_get_platdata(&client->dev);
07f9e5cf DC	325	struct tsc2007 *ts;
	326	struct input_dev *input_dev;
	327	int err;
	328
	329	if (!i2c_check_functionality(client->adapter,
	330	I2C_FUNC_SMBUS_READ_WORD_DATA))
	331	return -EIO;
	332
	333	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
	334	if (!ts)
	335	return -ENOMEM;
	336
	337	if (pdata)
	338	err = tsc2007_probe_pdev(client, ts, pdata, id);
	339	else
	340	err = tsc2007_probe_dt(client, ts);
	341	if (err)
	342	return err;
	343
fd91a5f0 DT	344	input_dev = devm_input_allocate_device(&client->dev);
	345	if (!input_dev)
	346	return -ENOMEM;
07f9e5cf DC	347
	348	i2c_set_clientdata(client, ts);
	349
	350	ts->client = client;
	351	ts->irq = client->irq;
	352	ts->input = input_dev;
f1443404	353
07f9e5cf	354	init_waitqueue_head(&ts->wait);
f1443404	355	mutex_init(&ts->mlock);
07f9e5cf	356
4e8718a1 KS	357	snprintf(ts->phys, sizeof(ts->phys),
4e8718a1 KS	358	"%s/input0", dev_name(&client->dev));
50b6f1f4 KL	359
	360	input_dev->name = "TSC2007 Touchscreen";
	361	input_dev->phys = ts->phys;
	362	input_dev->id.bustype = BUS_I2C;
	363
d3654d7e DT	364	input_dev->open = tsc2007_open;
	365	input_dev->close = tsc2007_close;
	366
	367	input_set_drvdata(input_dev, ts);
	368
c61ebe83	369	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
50b6f1f4	370
07f9e5cf DC	371	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
07f9e5cf DC	372	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
891e376b	373	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
07f9e5cf	374	ts->fuzzz, 0);
50b6f1f4	375
fd91a5f0 DT	376	if (pdata) {
	377	if (pdata->exit_platform_hw) {
	378	err = devm_add_action(&client->dev,
	379	tsc2007_call_exit_platform_hw,
	380	&client->dev);
	381	if (err) {
	382	dev_err(&client->dev,
	383	"Failed to register exit_platform_hw action, %d\n",
	384	err);
	385	return err;
	386	}
	387	}
	388
	389	if (pdata->init_platform_hw)
	390	pdata->init_platform_hw();
	391	}
75fba3b0	392
fd91a5f0 DT	393	err = devm_request_threaded_irq(&client->dev, ts->irq,
	394	tsc2007_hard_irq, tsc2007_soft_irq,
	395	IRQF_ONESHOT,
	396	client->dev.driver->name, ts);
	397	if (err) {
	398	dev_err(&client->dev, "Failed to request irq %d: %d\n",
	399	ts->irq, err);
	400	return err;
50b6f1f4 KL	401	}
50b6f1f4 KL	402
d3654d7e	403	tsc2007_stop(ts);
cf5f439b	404
934df231 NS	405	/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
	406	err = tsc2007_xfer(ts, PWRDOWN);
	407	if (err < 0) {
	408	dev_err(&client->dev,
	409	"Failed to setup chip: %d\n", err);
f1443404	410	return err; /* chip does not respond */
934df231 NS	411	}
934df231 NS	412
50b6f1f4	413	err = input_register_device(input_dev);
fd91a5f0 DT	414	if (err) {
	415	dev_err(&client->dev,
	416	"Failed to register input device: %d\n", err);
	417	return err;
	418	}
50b6f1f4	419
f1443404 NS	420	err = tsc2007_iio_configure(ts);
	421	if (err) {
	422	dev_err(&client->dev,
	423	"Failed to register with IIO: %d\n", err);
	424	return err;
	425	}
	426
50b6f1f4 KL	427	return 0;
	428	}
	429
ce7b39a1	430	static const struct i2c_device_id tsc2007_idtable[] = {
50b6f1f4 KL	431	{ "tsc2007", 0 },
	432	{ }
	433	};
	434
	435	MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
	436
07f9e5cf DC	437	#ifdef CONFIG_OF
	438	static const struct of_device_id tsc2007_of_match[] = {
	439	{ .compatible = "ti,tsc2007" },
	440	{ /* sentinel */ }
	441	};
	442	MODULE_DEVICE_TABLE(of, tsc2007_of_match);
	443	#endif
	444
50b6f1f4 KL	445	static struct i2c_driver tsc2007_driver = {
50b6f1f4 KL	446	.driver = {
07f9e5cf DC	447	.name = "tsc2007",
07f9e5cf DC	448	.of_match_table = of_match_ptr(tsc2007_of_match),
50b6f1f4 KL	449	},
	450	.id_table = tsc2007_idtable,
	451	.probe = tsc2007_probe,
50b6f1f4 KL	452	};
50b6f1f4 KL	453
1b92c1cf	454	module_i2c_driver(tsc2007_driver);
50b6f1f4 KL	455
	456	MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
	457	MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
	458	MODULE_LICENSE("GPL");