[mirror_ubuntu-bionic-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/i2c/tsc2007.h>
#include <linux/of_device.h>
#include <linux/of_gpio.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);

			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>
	28	#include <linux/i2c/tsc2007.h>
07f9e5cf	29	#include <linux/of_device.h>
07f9e5cf	30	#include <linux/of_gpio.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 KL	143
50b6f1f4 KL	144	input_report_key(input, BTN_TOUCH, 1);
377dc553 DT	145	input_report_abs(input, ABS_X, tc.x);
	146	input_report_abs(input, ABS_Y, tc.y);
	147	input_report_abs(input, ABS_PRESSURE, rt);
	148
	149	input_sync(input);
	150
	151	} else {
	152	/*
	153	* Sample found inconsistent by debouncing or pressure is
	154	* beyond the maximum. Don't report it to user space,
	155	* repeat at least once more the measurement.
	156	*/
	157	dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
50b6f1f4 KL	158	}
50b6f1f4 KL	159
bbdb38a2	160	wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);
377dc553	161	}
50b6f1f4	162
377dc553	163	dev_dbg(&ts->client->dev, "UP\n");
50b6f1f4	164
377dc553 DT	165	input_report_key(input, BTN_TOUCH, 0);
	166	input_report_abs(input, ABS_PRESSURE, 0);
	167	input_sync(input);
50b6f1f4	168
377dc553 DT	169	if (ts->clear_penirq)
377dc553 DT	170	ts->clear_penirq();
141586bc	171
377dc553	172	return IRQ_HANDLED;
50b6f1f4 KL	173	}
50b6f1f4 KL	174
377dc553	175	static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
50b6f1f4 KL	176	{
50b6f1f4 KL	177	struct tsc2007 *ts = handle;
50b6f1f4	178
07f9e5cf	179	if (tsc2007_is_pen_down(ts))
377dc553	180	return IRQ_WAKE_THREAD;
50b6f1f4 KL	181
	182	if (ts->clear_penirq)
	183	ts->clear_penirq();
	184
50b6f1f4 KL	185	return IRQ_HANDLED;
	186	}
	187
d3654d7e	188	static void tsc2007_stop(struct tsc2007 *ts)
141586bc	189	{
377dc553 DT	190	ts->stopped = true;
	191	mb();
	192	wake_up(&ts->wait);
d3654d7e DT	193
	194	disable_irq(ts->irq);
	195	}
	196
	197	static int tsc2007_open(struct input_dev *input_dev)
	198	{
	199	struct tsc2007 *ts = input_get_drvdata(input_dev);
	200	int err;
	201
	202	ts->stopped = false;
	203	mb();
	204
	205	enable_irq(ts->irq);
	206
	207	/* Prepare for touch readings - power down ADC and enable PENIRQ */
	208	err = tsc2007_xfer(ts, PWRDOWN);
	209	if (err < 0) {
	210	tsc2007_stop(ts);
	211	return err;
	212	}
	213
	214	return 0;
	215	}
	216
	217	static void tsc2007_close(struct input_dev *input_dev)
	218	{
	219	struct tsc2007 *ts = input_get_drvdata(input_dev);
	220
	221	tsc2007_stop(ts);
141586bc DT	222	}
141586bc DT	223
07f9e5cf DC	224	#ifdef CONFIG_OF
07f9e5cf DC	225	static int tsc2007_get_pendown_state_gpio(struct device *dev)
50b6f1f4	226	{
07f9e5cf DC	227	struct i2c_client *client = to_i2c_client(dev);
	228	struct tsc2007 *ts = i2c_get_clientdata(client);
	229
	230	return !gpio_get_value(ts->gpio);
	231	}
	232
	233	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	234	{
	235	struct device_node *np = client->dev.of_node;
	236	u32 val32;
	237	u64 val64;
50b6f1f4	238
07f9e5cf DC	239	if (!np) {
07f9e5cf DC	240	dev_err(&client->dev, "missing device tree data\n");
50b6f1f4 KL	241	return -EINVAL;
	242	}
	243
07f9e5cf DC	244	if (!of_property_read_u32(np, "ti,max-rt", &val32))
	245	ts->max_rt = val32;
	246	else
	247	ts->max_rt = MAX_12BIT;
50b6f1f4	248
07f9e5cf DC	249	if (!of_property_read_u32(np, "ti,fuzzx", &val32))
	250	ts->fuzzx = val32;
	251
	252	if (!of_property_read_u32(np, "ti,fuzzy", &val32))
	253	ts->fuzzy = val32;
	254
	255	if (!of_property_read_u32(np, "ti,fuzzz", &val32))
	256	ts->fuzzz = val32;
	257
	258	if (!of_property_read_u64(np, "ti,poll-period", &val64))
bbdb38a2	259	ts->poll_period = msecs_to_jiffies(val64);
07f9e5cf	260	else
bbdb38a2	261	ts->poll_period = msecs_to_jiffies(1);
07f9e5cf DC	262
	263	if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
	264	ts->x_plate_ohms = val32;
	265	} else {
	266	dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
	267	return -EINVAL;
50b6f1f4 KL	268	}
50b6f1f4 KL	269
07f9e5cf DC	270	ts->gpio = of_get_gpio(np, 0);
	271	if (gpio_is_valid(ts->gpio))
	272	ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
	273	else
	274	dev_warn(&client->dev,
	275	"GPIO not specified in DT (of_get_gpio returned %d)\n",
	276	ts->gpio);
50b6f1f4	277
07f9e5cf DC	278	return 0;
	279	}
	280	#else
	281	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	282	{
	283	dev_err(&client->dev, "platform data is required!\n");
	284	return -EINVAL;
	285	}
	286	#endif
	287
	288	static int tsc2007_probe_pdev(struct i2c_client client, struct tsc2007 ts,
	289	const struct tsc2007_platform_data *pdata,
	290	const struct i2c_device_id *id)
	291	{
50b6f1f4 KL	292	ts->model = pdata->model;
50b6f1f4 KL	293	ts->x_plate_ohms = pdata->x_plate_ohms;
84005eb5	294	ts->max_rt = pdata->max_rt ? : MAX_12BIT;
bbdb38a2	295	ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1);
50b6f1f4 KL	296	ts->get_pendown_state = pdata->get_pendown_state;
50b6f1f4 KL	297	ts->clear_penirq = pdata->clear_penirq;
07f9e5cf DC	298	ts->fuzzx = pdata->fuzzx;
	299	ts->fuzzy = pdata->fuzzy;
	300	ts->fuzzz = pdata->fuzzz;
50b6f1f4	301
341deefe PR	302	if (pdata->x_plate_ohms == 0) {
341deefe PR	303	dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
07f9e5cf	304	return -EINVAL;
341deefe PR	305	}
341deefe PR	306
07f9e5cf DC	307	return 0;
	308	}
	309
fd91a5f0 DT	310	static void tsc2007_call_exit_platform_hw(void *data)
	311	{
	312	struct device *dev = data;
	313	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
	314
	315	pdata->exit_platform_hw();
	316	}
	317
07f9e5cf DC	318	static int tsc2007_probe(struct i2c_client *client,
	319	const struct i2c_device_id *id)
	320	{
f1443404 NS	321	const struct tsc2007_platform_data *pdata =
f1443404 NS	322	dev_get_platdata(&client->dev);
07f9e5cf DC	323	struct tsc2007 *ts;
	324	struct input_dev *input_dev;
	325	int err;
	326
	327	if (!i2c_check_functionality(client->adapter,
	328	I2C_FUNC_SMBUS_READ_WORD_DATA))
	329	return -EIO;
	330
	331	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
	332	if (!ts)
	333	return -ENOMEM;
	334
	335	if (pdata)
	336	err = tsc2007_probe_pdev(client, ts, pdata, id);
	337	else
	338	err = tsc2007_probe_dt(client, ts);
	339	if (err)
	340	return err;
	341
fd91a5f0 DT	342	input_dev = devm_input_allocate_device(&client->dev);
	343	if (!input_dev)
	344	return -ENOMEM;
07f9e5cf DC	345
	346	i2c_set_clientdata(client, ts);
	347
	348	ts->client = client;
	349	ts->irq = client->irq;
	350	ts->input = input_dev;
f1443404	351
07f9e5cf	352	init_waitqueue_head(&ts->wait);
f1443404	353	mutex_init(&ts->mlock);
07f9e5cf	354
4e8718a1 KS	355	snprintf(ts->phys, sizeof(ts->phys),
4e8718a1 KS	356	"%s/input0", dev_name(&client->dev));
50b6f1f4 KL	357
	358	input_dev->name = "TSC2007 Touchscreen";
	359	input_dev->phys = ts->phys;
	360	input_dev->id.bustype = BUS_I2C;
	361
d3654d7e DT	362	input_dev->open = tsc2007_open;
	363	input_dev->close = tsc2007_close;
	364
	365	input_set_drvdata(input_dev, ts);
	366
c61ebe83	367	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
50b6f1f4	368
07f9e5cf DC	369	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
07f9e5cf DC	370	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
891e376b	371	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
07f9e5cf	372	ts->fuzzz, 0);
50b6f1f4	373
fd91a5f0 DT	374	if (pdata) {
	375	if (pdata->exit_platform_hw) {
	376	err = devm_add_action(&client->dev,
	377	tsc2007_call_exit_platform_hw,
	378	&client->dev);
	379	if (err) {
	380	dev_err(&client->dev,
	381	"Failed to register exit_platform_hw action, %d\n",
	382	err);
	383	return err;
	384	}
	385	}
	386
	387	if (pdata->init_platform_hw)
	388	pdata->init_platform_hw();
	389	}
75fba3b0	390
fd91a5f0 DT	391	err = devm_request_threaded_irq(&client->dev, ts->irq,
	392	tsc2007_hard_irq, tsc2007_soft_irq,
	393	IRQF_ONESHOT,
	394	client->dev.driver->name, ts);
	395	if (err) {
	396	dev_err(&client->dev, "Failed to request irq %d: %d\n",
	397	ts->irq, err);
	398	return err;
50b6f1f4 KL	399	}
50b6f1f4 KL	400
d3654d7e	401	tsc2007_stop(ts);
cf5f439b	402
934df231 NS	403	/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
	404	err = tsc2007_xfer(ts, PWRDOWN);
	405	if (err < 0) {
	406	dev_err(&client->dev,
	407	"Failed to setup chip: %d\n", err);
f1443404	408	return err; /* chip does not respond */
934df231 NS	409	}
934df231 NS	410
50b6f1f4	411	err = input_register_device(input_dev);
fd91a5f0 DT	412	if (err) {
	413	dev_err(&client->dev,
	414	"Failed to register input device: %d\n", err);
	415	return err;
	416	}
50b6f1f4	417
f1443404 NS	418	err = tsc2007_iio_configure(ts);
	419	if (err) {
	420	dev_err(&client->dev,
	421	"Failed to register with IIO: %d\n", err);
	422	return err;
	423	}
	424
50b6f1f4 KL	425	return 0;
	426	}
	427
ce7b39a1	428	static const struct i2c_device_id tsc2007_idtable[] = {
50b6f1f4 KL	429	{ "tsc2007", 0 },
	430	{ }
	431	};
	432
	433	MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
	434
07f9e5cf DC	435	#ifdef CONFIG_OF
	436	static const struct of_device_id tsc2007_of_match[] = {
	437	{ .compatible = "ti,tsc2007" },
	438	{ /* sentinel */ }
	439	};
	440	MODULE_DEVICE_TABLE(of, tsc2007_of_match);
	441	#endif
	442
50b6f1f4 KL	443	static struct i2c_driver tsc2007_driver = {
50b6f1f4 KL	444	.driver = {
07f9e5cf DC	445	.name = "tsc2007",
07f9e5cf DC	446	.of_match_table = of_match_ptr(tsc2007_of_match),
50b6f1f4 KL	447	},
	448	.id_table = tsc2007_idtable,
	449	.probe = tsc2007_probe,
50b6f1f4 KL	450	};
50b6f1f4 KL	451
1b92c1cf	452	module_i2c_driver(tsc2007_driver);
50b6f1f4 KL	453
	454	MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
	455	MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
	456	MODULE_LICENSE("GPL");