[mirror_ubuntu-eoan-kernel.git] / drivers / input / touchscreen / tsc2007_core.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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
 */

#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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
50b6f1f4 KL	2	/*
	3	* drivers/input/touchscreen/tsc2007.c
	4	*
	5	* Copyright (c) 2008 MtekVision Co., Ltd.
	6	* Kwangwoo Lee <kwlee@mtekvision.com>
	7	*
	8	* Using code from:
	9	* - ads7846.c
	10	* Copyright (c) 2005 David Brownell
	11	* Copyright (c) 2006 Nokia Corporation
	12	* - corgi_ts.c
	13	* Copyright (C) 2004-2005 Richard Purdie
	14	* - omap_ts.[hc], ads7846.h, ts_osk.c
	15	* Copyright (C) 2002 MontaVista Software
	16	* Copyright (C) 2004 Texas Instruments
	17	* Copyright (C) 2005 Dirk Behme
50b6f1f4 KL	18	*/
	19
	20	#include <linux/module.h>
50b6f1f4 KL	21	#include <linux/slab.h>
	22	#include <linux/input.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/i2c.h>
07f9e5cf	25	#include <linux/of_device.h>
07f9e5cf	26	#include <linux/of_gpio.h>
8fd70815	27	#include <linux/platform_data/tsc2007.h>
f1443404	28	#include "tsc2007.h"
50b6f1f4	29
f1443404	30	int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
50b6f1f4 KL	31	{
	32	s32 data;
	33	u16 val;
	34
	35	data = i2c_smbus_read_word_data(tsc->client, cmd);
	36	if (data < 0) {
	37	dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
	38	return data;
	39	}
	40
	41	/* The protocol and raw data format from i2c interface:
	42	* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
	43	* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 \| Dummy 4bit].
	44	*/
	45	val = swab16(data) >> 4;
	46
	47	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
	48
	49	return val;
	50	}
	51
d570e9ef	52	static void tsc2007_read_values(struct tsc2007 tsc, struct ts_event tc)
50b6f1f4	53	{
d570e9ef DT	54	/* y- still on; turn on only y+ (and ADC) */
	55	tc->y = tsc2007_xfer(tsc, READ_Y);
	56
	57	/* turn y- off, x+ on, then leave in lowpower */
	58	tc->x = tsc2007_xfer(tsc, READ_X);
	59
	60	/* turn y+ off, x- on; we'll use formula #1 */
	61	tc->z1 = tsc2007_xfer(tsc, READ_Z1);
	62	tc->z2 = tsc2007_xfer(tsc, READ_Z2);
	63
	64	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
	65	tsc2007_xfer(tsc, PWRDOWN);
	66	}
50b6f1f4	67
deec586d	68	u32 tsc2007_calculate_resistance(struct tsc2007 tsc, struct ts_event tc)
d570e9ef DT	69	{
d570e9ef DT	70	u32 rt = 0;
50b6f1f4 KL	71
50b6f1f4 KL	72	/* range filtering */
d570e9ef DT	73	if (tc->x == MAX_12BIT)
d570e9ef DT	74	tc->x = 0;
50b6f1f4	75
d570e9ef	76	if (likely(tc->x && tc->z1)) {
deec586d	77	/* compute touch resistance using equation #1 */
d570e9ef DT	78	rt = tc->z2 - tc->z1;
	79	rt *= tc->x;
	80	rt *= tsc->x_plate_ohms;
	81	rt /= tc->z1;
50b6f1f4	82	rt = (rt + 2047) >> 12;
50b6f1f4 KL	83	}
50b6f1f4 KL	84
d570e9ef DT	85	return rt;
	86	}
	87
f1443404	88	bool tsc2007_is_pen_down(struct tsc2007 *ts)
d570e9ef	89	{
141586bc DT	90	/*
141586bc DT	91	* NOTE: We can't rely on the pressure to determine the pen down
d570e9ef DT	92	* state, even though this controller has a pressure sensor.
	93	* The pressure value can fluctuate for quite a while after
	94	* lifting the pen and in some cases may not even settle at the
	95	* expected value.
50b6f1f4 KL	96	*
50b6f1f4 KL	97	* The only safe way to check for the pen up condition is in the
d570e9ef DT	98	* work function by reading the pen signal state (it's a GPIO
d570e9ef DT	99	* and IRQ). Unfortunately such callback is not always available,
377dc553 DT	100	* in that case we assume that the pen is down and expect caller
377dc553 DT	101	* to fall back on the pressure reading.
50b6f1f4	102	*/
d570e9ef	103
377dc553 DT	104	if (!ts->get_pendown_state)
377dc553 DT	105	return true;
d570e9ef	106
07f9e5cf	107	return ts->get_pendown_state(&ts->client->dev);
377dc553	108	}
d570e9ef	109
377dc553 DT	110	static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
	111	{
	112	struct tsc2007 *ts = handle;
	113	struct input_dev *input = ts->input;
	114	struct ts_event tc;
	115	u32 rt;
d570e9ef	116
377dc553 DT	117	while (!ts->stopped && tsc2007_is_pen_down(ts)) {
	118
	119	/* pen is down, continue with the measurement */
f1443404 NS	120
f1443404 NS	121	mutex_lock(&ts->mlock);
377dc553	122	tsc2007_read_values(ts, &tc);
f1443404	123	mutex_unlock(&ts->mlock);
d570e9ef	124
deec586d	125	rt = tsc2007_calculate_resistance(ts, &tc);
50b6f1f4	126
07f9e5cf	127	if (!rt && !ts->get_pendown_state) {
377dc553 DT	128	/*
	129	* If pressure reported is 0 and we don't have
	130	* callback to check pendown state, we have to
	131	* assume that pen was lifted up.
	132	*/
	133	break;
	134	}
	135
	136	if (rt <= ts->max_rt) {
	137	dev_dbg(&ts->client->dev,
deec586d	138	"DOWN point(%4d,%4d), resistance (%4u)\n",
377dc553	139	tc.x, tc.y, rt);
50b6f1f4	140
db4572ff NS	141	rt = ts->max_rt - rt;
db4572ff NS	142
50b6f1f4	143	input_report_key(input, BTN_TOUCH, 1);
377dc553 DT	144	input_report_abs(input, ABS_X, tc.x);
	145	input_report_abs(input, ABS_Y, tc.y);
	146	input_report_abs(input, ABS_PRESSURE, rt);
	147
	148	input_sync(input);
	149
	150	} else {
	151	/*
	152	* Sample found inconsistent by debouncing or pressure is
	153	* beyond the maximum. Don't report it to user space,
	154	* repeat at least once more the measurement.
	155	*/
	156	dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
50b6f1f4 KL	157	}
50b6f1f4 KL	158
bbdb38a2	159	wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);
377dc553	160	}
50b6f1f4	161
377dc553	162	dev_dbg(&ts->client->dev, "UP\n");
50b6f1f4	163
377dc553 DT	164	input_report_key(input, BTN_TOUCH, 0);
	165	input_report_abs(input, ABS_PRESSURE, 0);
	166	input_sync(input);
50b6f1f4	167
377dc553 DT	168	if (ts->clear_penirq)
377dc553 DT	169	ts->clear_penirq();
141586bc	170
377dc553	171	return IRQ_HANDLED;
50b6f1f4 KL	172	}
50b6f1f4 KL	173
377dc553	174	static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
50b6f1f4 KL	175	{
50b6f1f4 KL	176	struct tsc2007 *ts = handle;
50b6f1f4	177
07f9e5cf	178	if (tsc2007_is_pen_down(ts))
377dc553	179	return IRQ_WAKE_THREAD;
50b6f1f4 KL	180
	181	if (ts->clear_penirq)
	182	ts->clear_penirq();
	183
50b6f1f4 KL	184	return IRQ_HANDLED;
	185	}
	186
d3654d7e	187	static void tsc2007_stop(struct tsc2007 *ts)
141586bc	188	{
377dc553 DT	189	ts->stopped = true;
	190	mb();
	191	wake_up(&ts->wait);
d3654d7e DT	192
	193	disable_irq(ts->irq);
	194	}
	195
	196	static int tsc2007_open(struct input_dev *input_dev)
	197	{
	198	struct tsc2007 *ts = input_get_drvdata(input_dev);
	199	int err;
	200
	201	ts->stopped = false;
	202	mb();
	203
	204	enable_irq(ts->irq);
	205
	206	/* Prepare for touch readings - power down ADC and enable PENIRQ */
	207	err = tsc2007_xfer(ts, PWRDOWN);
	208	if (err < 0) {
	209	tsc2007_stop(ts);
	210	return err;
	211	}
	212
	213	return 0;
	214	}
	215
	216	static void tsc2007_close(struct input_dev *input_dev)
	217	{
	218	struct tsc2007 *ts = input_get_drvdata(input_dev);
	219
	220	tsc2007_stop(ts);
141586bc DT	221	}
141586bc DT	222
07f9e5cf DC	223	#ifdef CONFIG_OF
07f9e5cf DC	224	static int tsc2007_get_pendown_state_gpio(struct device *dev)
50b6f1f4	225	{
07f9e5cf DC	226	struct i2c_client *client = to_i2c_client(dev);
	227	struct tsc2007 *ts = i2c_get_clientdata(client);
	228
	229	return !gpio_get_value(ts->gpio);
	230	}
	231
	232	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	233	{
	234	struct device_node *np = client->dev.of_node;
	235	u32 val32;
	236	u64 val64;
50b6f1f4	237
07f9e5cf DC	238	if (!np) {
07f9e5cf DC	239	dev_err(&client->dev, "missing device tree data\n");
50b6f1f4 KL	240	return -EINVAL;
	241	}
	242
07f9e5cf DC	243	if (!of_property_read_u32(np, "ti,max-rt", &val32))
	244	ts->max_rt = val32;
	245	else
	246	ts->max_rt = MAX_12BIT;
50b6f1f4	247
07f9e5cf DC	248	if (!of_property_read_u32(np, "ti,fuzzx", &val32))
	249	ts->fuzzx = val32;
	250
	251	if (!of_property_read_u32(np, "ti,fuzzy", &val32))
	252	ts->fuzzy = val32;
	253
	254	if (!of_property_read_u32(np, "ti,fuzzz", &val32))
	255	ts->fuzzz = val32;
	256
	257	if (!of_property_read_u64(np, "ti,poll-period", &val64))
bbdb38a2	258	ts->poll_period = msecs_to_jiffies(val64);
07f9e5cf	259	else
bbdb38a2	260	ts->poll_period = msecs_to_jiffies(1);
07f9e5cf DC	261
	262	if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
	263	ts->x_plate_ohms = val32;
	264	} else {
	265	dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
	266	return -EINVAL;
50b6f1f4 KL	267	}
50b6f1f4 KL	268
07f9e5cf DC	269	ts->gpio = of_get_gpio(np, 0);
	270	if (gpio_is_valid(ts->gpio))
	271	ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
	272	else
	273	dev_warn(&client->dev,
	274	"GPIO not specified in DT (of_get_gpio returned %d)\n",
	275	ts->gpio);
50b6f1f4	276
07f9e5cf DC	277	return 0;
	278	}
	279	#else
	280	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	281	{
	282	dev_err(&client->dev, "platform data is required!\n");
	283	return -EINVAL;
	284	}
	285	#endif
	286
	287	static int tsc2007_probe_pdev(struct i2c_client client, struct tsc2007 ts,
	288	const struct tsc2007_platform_data *pdata,
	289	const struct i2c_device_id *id)
	290	{
50b6f1f4 KL	291	ts->model = pdata->model;
50b6f1f4 KL	292	ts->x_plate_ohms = pdata->x_plate_ohms;
84005eb5	293	ts->max_rt = pdata->max_rt ? : MAX_12BIT;
bbdb38a2	294	ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1);
50b6f1f4 KL	295	ts->get_pendown_state = pdata->get_pendown_state;
50b6f1f4 KL	296	ts->clear_penirq = pdata->clear_penirq;
07f9e5cf DC	297	ts->fuzzx = pdata->fuzzx;
	298	ts->fuzzy = pdata->fuzzy;
	299	ts->fuzzz = pdata->fuzzz;
50b6f1f4	300
341deefe PR	301	if (pdata->x_plate_ohms == 0) {
341deefe PR	302	dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
07f9e5cf	303	return -EINVAL;
341deefe PR	304	}
341deefe PR	305
07f9e5cf DC	306	return 0;
	307	}
	308
fd91a5f0 DT	309	static void tsc2007_call_exit_platform_hw(void *data)
	310	{
	311	struct device *dev = data;
	312	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
	313
	314	pdata->exit_platform_hw();
	315	}
	316
07f9e5cf DC	317	static int tsc2007_probe(struct i2c_client *client,
	318	const struct i2c_device_id *id)
	319	{
f1443404 NS	320	const struct tsc2007_platform_data *pdata =
f1443404 NS	321	dev_get_platdata(&client->dev);
07f9e5cf DC	322	struct tsc2007 *ts;
	323	struct input_dev *input_dev;
	324	int err;
	325
	326	if (!i2c_check_functionality(client->adapter,
	327	I2C_FUNC_SMBUS_READ_WORD_DATA))
	328	return -EIO;
	329
	330	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
	331	if (!ts)
	332	return -ENOMEM;
	333
	334	if (pdata)
	335	err = tsc2007_probe_pdev(client, ts, pdata, id);
	336	else
	337	err = tsc2007_probe_dt(client, ts);
	338	if (err)
	339	return err;
	340
fd91a5f0 DT	341	input_dev = devm_input_allocate_device(&client->dev);
	342	if (!input_dev)
	343	return -ENOMEM;
07f9e5cf DC	344
	345	i2c_set_clientdata(client, ts);
	346
	347	ts->client = client;
	348	ts->irq = client->irq;
	349	ts->input = input_dev;
f1443404	350
07f9e5cf	351	init_waitqueue_head(&ts->wait);
f1443404	352	mutex_init(&ts->mlock);
07f9e5cf	353
4e8718a1 KS	354	snprintf(ts->phys, sizeof(ts->phys),
4e8718a1 KS	355	"%s/input0", dev_name(&client->dev));
50b6f1f4 KL	356
	357	input_dev->name = "TSC2007 Touchscreen";
	358	input_dev->phys = ts->phys;
	359	input_dev->id.bustype = BUS_I2C;
	360
d3654d7e DT	361	input_dev->open = tsc2007_open;
	362	input_dev->close = tsc2007_close;
	363
	364	input_set_drvdata(input_dev, ts);
	365
c61ebe83	366	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
50b6f1f4	367
07f9e5cf DC	368	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
07f9e5cf DC	369	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
891e376b	370	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
07f9e5cf	371	ts->fuzzz, 0);
50b6f1f4	372
fd91a5f0 DT	373	if (pdata) {
	374	if (pdata->exit_platform_hw) {
	375	err = devm_add_action(&client->dev,
	376	tsc2007_call_exit_platform_hw,
	377	&client->dev);
	378	if (err) {
	379	dev_err(&client->dev,
	380	"Failed to register exit_platform_hw action, %d\n",
	381	err);
	382	return err;
	383	}
	384	}
	385
	386	if (pdata->init_platform_hw)
	387	pdata->init_platform_hw();
	388	}
75fba3b0	389
fd91a5f0 DT	390	err = devm_request_threaded_irq(&client->dev, ts->irq,
	391	tsc2007_hard_irq, tsc2007_soft_irq,
	392	IRQF_ONESHOT,
	393	client->dev.driver->name, ts);
	394	if (err) {
	395	dev_err(&client->dev, "Failed to request irq %d: %d\n",
	396	ts->irq, err);
	397	return err;
50b6f1f4 KL	398	}
50b6f1f4 KL	399
d3654d7e	400	tsc2007_stop(ts);
cf5f439b	401
934df231 NS	402	/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
	403	err = tsc2007_xfer(ts, PWRDOWN);
	404	if (err < 0) {
	405	dev_err(&client->dev,
	406	"Failed to setup chip: %d\n", err);
f1443404	407	return err; /* chip does not respond */
934df231 NS	408	}
934df231 NS	409
50b6f1f4	410	err = input_register_device(input_dev);
fd91a5f0 DT	411	if (err) {
	412	dev_err(&client->dev,
	413	"Failed to register input device: %d\n", err);
	414	return err;
	415	}
50b6f1f4	416
f1443404 NS	417	err = tsc2007_iio_configure(ts);
	418	if (err) {
	419	dev_err(&client->dev,
	420	"Failed to register with IIO: %d\n", err);
	421	return err;
	422	}
	423
50b6f1f4 KL	424	return 0;
	425	}
	426
ce7b39a1	427	static const struct i2c_device_id tsc2007_idtable[] = {
50b6f1f4 KL	428	{ "tsc2007", 0 },
	429	{ }
	430	};
	431
	432	MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
	433
07f9e5cf DC	434	#ifdef CONFIG_OF
	435	static const struct of_device_id tsc2007_of_match[] = {
	436	{ .compatible = "ti,tsc2007" },
	437	{ /* sentinel */ }
	438	};
	439	MODULE_DEVICE_TABLE(of, tsc2007_of_match);
	440	#endif
	441
50b6f1f4 KL	442	static struct i2c_driver tsc2007_driver = {
50b6f1f4 KL	443	.driver = {
07f9e5cf DC	444	.name = "tsc2007",
07f9e5cf DC	445	.of_match_table = of_match_ptr(tsc2007_of_match),
50b6f1f4 KL	446	},
	447	.id_table = tsc2007_idtable,
	448	.probe = tsc2007_probe,
50b6f1f4 KL	449	};
50b6f1f4 KL	450
1b92c1cf	451	module_i2c_driver(tsc2007_driver);
50b6f1f4 KL	452
	453	MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
	454	MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
	455	MODULE_LICENSE("GPL");