[mirror_ubuntu-bionic-kernel.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>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/of_gpio.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_period; /* in jiffies */
	int			fuzzx;
	int			fuzzy;
	int			fuzzz;

	unsigned		gpio;
	int			irq;

	wait_queue_head_t	wait;
	bool			stopped;

	int			(*get_pendown_state)(struct device *);
	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(&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 */
		tsc2007_read_values(ts, &tc);

		rt = tsc2007_calculate_pressure(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), 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, 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);

	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, 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);

	err = input_register_device(input_dev);
	if (err) {
		dev_err(&client->dev,
			"Failed to register input device: %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 = {
		.owner	= THIS_MODULE,
		.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 DC	29	#include <linux/of_device.h>
	30	#include <linux/of.h>
	31	#include <linux/of_gpio.h>
50b6f1f4	32
50b6f1f4 KL	33	#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
	34	#define TSC2007_MEASURE_AUX (0x2 << 4)
	35	#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
	36	#define TSC2007_ACTIVATE_XN (0x8 << 4)
	37	#define TSC2007_ACTIVATE_YN (0x9 << 4)
	38	#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
	39	#define TSC2007_SETUP (0xb << 4)
	40	#define TSC2007_MEASURE_X (0xc << 4)
	41	#define TSC2007_MEASURE_Y (0xd << 4)
	42	#define TSC2007_MEASURE_Z1 (0xe << 4)
	43	#define TSC2007_MEASURE_Z2 (0xf << 4)
	44
	45	#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
	46	#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
	47	#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
	48	#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
	49
	50	#define TSC2007_12BIT (0x0 << 1)
	51	#define TSC2007_8BIT (0x1 << 1)
	52
	53	#define MAX_12BIT ((1 << 12) - 1)
	54
	55	#define ADC_ON_12BIT (TSC2007_12BIT \| TSC2007_ADC_ON_IRQ_DIS0)
	56
	57	#define READ_Y (ADC_ON_12BIT \| TSC2007_MEASURE_Y)
	58	#define READ_Z1 (ADC_ON_12BIT \| TSC2007_MEASURE_Z1)
	59	#define READ_Z2 (ADC_ON_12BIT \| TSC2007_MEASURE_Z2)
	60	#define READ_X (ADC_ON_12BIT \| TSC2007_MEASURE_X)
	61	#define PWRDOWN (TSC2007_12BIT \| TSC2007_POWER_OFF_IRQ_EN)
	62
	63	struct ts_event {
	64	u16 x;
	65	u16 y;
	66	u16 z1, z2;
	67	};
	68
	69	struct tsc2007 {
	70	struct input_dev *input;
	71	char phys[32];
50b6f1f4 KL	72
	73	struct i2c_client *client;
	74
50b6f1f4 KL	75	u16 model;
50b6f1f4 KL	76	u16 x_plate_ohms;
84005eb5	77	u16 max_rt;
bbdb38a2	78	unsigned long poll_period; /* in jiffies */
07f9e5cf DC	79	int fuzzx;
	80	int fuzzy;
	81	int fuzzz;
50b6f1f4	82
07f9e5cf	83	unsigned gpio;
50b6f1f4 KL	84	int irq;
50b6f1f4 KL	85
377dc553 DT	86	wait_queue_head_t wait;
	87	bool stopped;
	88
07f9e5cf	89	int (get_pendown_state)(struct device );
50b6f1f4 KL	90	void (*clear_penirq)(void);
	91	};
	92
	93	static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
	94	{
	95	s32 data;
	96	u16 val;
	97
	98	data = i2c_smbus_read_word_data(tsc->client, cmd);
	99	if (data < 0) {
	100	dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
	101	return data;
	102	}
	103
	104	/* The protocol and raw data format from i2c interface:
	105	* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
	106	* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 \| Dummy 4bit].
	107	*/
	108	val = swab16(data) >> 4;
	109
	110	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
	111
	112	return val;
	113	}
	114
d570e9ef	115	static void tsc2007_read_values(struct tsc2007 tsc, struct ts_event tc)
50b6f1f4	116	{
d570e9ef DT	117	/* y- still on; turn on only y+ (and ADC) */
	118	tc->y = tsc2007_xfer(tsc, READ_Y);
	119
	120	/* turn y- off, x+ on, then leave in lowpower */
	121	tc->x = tsc2007_xfer(tsc, READ_X);
	122
	123	/* turn y+ off, x- on; we'll use formula #1 */
	124	tc->z1 = tsc2007_xfer(tsc, READ_Z1);
	125	tc->z2 = tsc2007_xfer(tsc, READ_Z2);
	126
	127	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
	128	tsc2007_xfer(tsc, PWRDOWN);
	129	}
50b6f1f4	130
d570e9ef DT	131	static u32 tsc2007_calculate_pressure(struct tsc2007 tsc, struct ts_event tc)
	132	{
	133	u32 rt = 0;
50b6f1f4 KL	134
50b6f1f4 KL	135	/* range filtering */
d570e9ef DT	136	if (tc->x == MAX_12BIT)
d570e9ef DT	137	tc->x = 0;
50b6f1f4	138
d570e9ef	139	if (likely(tc->x && tc->z1)) {
50b6f1f4	140	/* compute touch pressure resistance using equation #1 */
d570e9ef DT	141	rt = tc->z2 - tc->z1;
	142	rt *= tc->x;
	143	rt *= tsc->x_plate_ohms;
	144	rt /= tc->z1;
50b6f1f4	145	rt = (rt + 2047) >> 12;
50b6f1f4 KL	146	}
50b6f1f4 KL	147
d570e9ef DT	148	return rt;
	149	}
	150
377dc553	151	static bool tsc2007_is_pen_down(struct tsc2007 *ts)
d570e9ef	152	{
141586bc DT	153	/*
141586bc DT	154	* NOTE: We can't rely on the pressure to determine the pen down
d570e9ef DT	155	* state, even though this controller has a pressure sensor.
	156	* The pressure value can fluctuate for quite a while after
	157	* lifting the pen and in some cases may not even settle at the
	158	* expected value.
50b6f1f4 KL	159	*
50b6f1f4 KL	160	* The only safe way to check for the pen up condition is in the
d570e9ef DT	161	* work function by reading the pen signal state (it's a GPIO
d570e9ef DT	162	* and IRQ). Unfortunately such callback is not always available,
377dc553 DT	163	* in that case we assume that the pen is down and expect caller
377dc553 DT	164	* to fall back on the pressure reading.
50b6f1f4	165	*/
d570e9ef	166
377dc553 DT	167	if (!ts->get_pendown_state)
377dc553 DT	168	return true;
d570e9ef	169
07f9e5cf	170	return ts->get_pendown_state(&ts->client->dev);
377dc553	171	}
d570e9ef	172
377dc553 DT	173	static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
	174	{
	175	struct tsc2007 *ts = handle;
	176	struct input_dev *input = ts->input;
	177	struct ts_event tc;
	178	u32 rt;
d570e9ef	179
377dc553 DT	180	while (!ts->stopped && tsc2007_is_pen_down(ts)) {
	181
	182	/* pen is down, continue with the measurement */
	183	tsc2007_read_values(ts, &tc);
d570e9ef	184
377dc553	185	rt = tsc2007_calculate_pressure(ts, &tc);
50b6f1f4	186
07f9e5cf	187	if (!rt && !ts->get_pendown_state) {
377dc553 DT	188	/*
	189	* If pressure reported is 0 and we don't have
	190	* callback to check pendown state, we have to
	191	* assume that pen was lifted up.
	192	*/
	193	break;
	194	}
	195
	196	if (rt <= ts->max_rt) {
	197	dev_dbg(&ts->client->dev,
	198	"DOWN point(%4d,%4d), pressure (%4u)\n",
	199	tc.x, tc.y, rt);
50b6f1f4 KL	200
50b6f1f4 KL	201	input_report_key(input, BTN_TOUCH, 1);
377dc553 DT	202	input_report_abs(input, ABS_X, tc.x);
	203	input_report_abs(input, ABS_Y, tc.y);
	204	input_report_abs(input, ABS_PRESSURE, rt);
	205
	206	input_sync(input);
	207
	208	} else {
	209	/*
	210	* Sample found inconsistent by debouncing or pressure is
	211	* beyond the maximum. Don't report it to user space,
	212	* repeat at least once more the measurement.
	213	*/
	214	dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
50b6f1f4 KL	215	}
50b6f1f4 KL	216
bbdb38a2	217	wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);
377dc553	218	}
50b6f1f4	219
377dc553	220	dev_dbg(&ts->client->dev, "UP\n");
50b6f1f4	221
377dc553 DT	222	input_report_key(input, BTN_TOUCH, 0);
	223	input_report_abs(input, ABS_PRESSURE, 0);
	224	input_sync(input);
50b6f1f4	225
377dc553 DT	226	if (ts->clear_penirq)
377dc553 DT	227	ts->clear_penirq();
141586bc	228
377dc553	229	return IRQ_HANDLED;
50b6f1f4 KL	230	}
50b6f1f4 KL	231
377dc553	232	static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
50b6f1f4 KL	233	{
50b6f1f4 KL	234	struct tsc2007 *ts = handle;
50b6f1f4	235
07f9e5cf	236	if (tsc2007_is_pen_down(ts))
377dc553	237	return IRQ_WAKE_THREAD;
50b6f1f4 KL	238
	239	if (ts->clear_penirq)
	240	ts->clear_penirq();
	241
50b6f1f4 KL	242	return IRQ_HANDLED;
	243	}
	244
d3654d7e	245	static void tsc2007_stop(struct tsc2007 *ts)
141586bc	246	{
377dc553 DT	247	ts->stopped = true;
	248	mb();
	249	wake_up(&ts->wait);
d3654d7e DT	250
	251	disable_irq(ts->irq);
	252	}
	253
	254	static int tsc2007_open(struct input_dev *input_dev)
	255	{
	256	struct tsc2007 *ts = input_get_drvdata(input_dev);
	257	int err;
	258
	259	ts->stopped = false;
	260	mb();
	261
	262	enable_irq(ts->irq);
	263
	264	/* Prepare for touch readings - power down ADC and enable PENIRQ */
	265	err = tsc2007_xfer(ts, PWRDOWN);
	266	if (err < 0) {
	267	tsc2007_stop(ts);
	268	return err;
	269	}
	270
	271	return 0;
	272	}
	273
	274	static void tsc2007_close(struct input_dev *input_dev)
	275	{
	276	struct tsc2007 *ts = input_get_drvdata(input_dev);
	277
	278	tsc2007_stop(ts);
141586bc DT	279	}
141586bc DT	280
07f9e5cf DC	281	#ifdef CONFIG_OF
07f9e5cf DC	282	static int tsc2007_get_pendown_state_gpio(struct device *dev)
50b6f1f4	283	{
07f9e5cf DC	284	struct i2c_client *client = to_i2c_client(dev);
	285	struct tsc2007 *ts = i2c_get_clientdata(client);
	286
	287	return !gpio_get_value(ts->gpio);
	288	}
	289
	290	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	291	{
	292	struct device_node *np = client->dev.of_node;
	293	u32 val32;
	294	u64 val64;
50b6f1f4	295
07f9e5cf DC	296	if (!np) {
07f9e5cf DC	297	dev_err(&client->dev, "missing device tree data\n");
50b6f1f4 KL	298	return -EINVAL;
	299	}
	300
07f9e5cf DC	301	if (!of_property_read_u32(np, "ti,max-rt", &val32))
	302	ts->max_rt = val32;
	303	else
	304	ts->max_rt = MAX_12BIT;
50b6f1f4	305
07f9e5cf DC	306	if (!of_property_read_u32(np, "ti,fuzzx", &val32))
	307	ts->fuzzx = val32;
	308
	309	if (!of_property_read_u32(np, "ti,fuzzy", &val32))
	310	ts->fuzzy = val32;
	311
	312	if (!of_property_read_u32(np, "ti,fuzzz", &val32))
	313	ts->fuzzz = val32;
	314
	315	if (!of_property_read_u64(np, "ti,poll-period", &val64))
bbdb38a2	316	ts->poll_period = msecs_to_jiffies(val64);
07f9e5cf	317	else
bbdb38a2	318	ts->poll_period = msecs_to_jiffies(1);
07f9e5cf DC	319
	320	if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
	321	ts->x_plate_ohms = val32;
	322	} else {
	323	dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
	324	return -EINVAL;
50b6f1f4 KL	325	}
50b6f1f4 KL	326
07f9e5cf DC	327	ts->gpio = of_get_gpio(np, 0);
	328	if (gpio_is_valid(ts->gpio))
	329	ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
	330	else
	331	dev_warn(&client->dev,
	332	"GPIO not specified in DT (of_get_gpio returned %d)\n",
	333	ts->gpio);
50b6f1f4	334
07f9e5cf DC	335	return 0;
	336	}
	337	#else
	338	static int tsc2007_probe_dt(struct i2c_client client, struct tsc2007 ts)
	339	{
	340	dev_err(&client->dev, "platform data is required!\n");
	341	return -EINVAL;
	342	}
	343	#endif
	344
	345	static int tsc2007_probe_pdev(struct i2c_client client, struct tsc2007 ts,
	346	const struct tsc2007_platform_data *pdata,
	347	const struct i2c_device_id *id)
	348	{
50b6f1f4 KL	349	ts->model = pdata->model;
50b6f1f4 KL	350	ts->x_plate_ohms = pdata->x_plate_ohms;
84005eb5	351	ts->max_rt = pdata->max_rt ? : MAX_12BIT;
bbdb38a2	352	ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1);
50b6f1f4 KL	353	ts->get_pendown_state = pdata->get_pendown_state;
50b6f1f4 KL	354	ts->clear_penirq = pdata->clear_penirq;
07f9e5cf DC	355	ts->fuzzx = pdata->fuzzx;
	356	ts->fuzzy = pdata->fuzzy;
	357	ts->fuzzz = pdata->fuzzz;
50b6f1f4	358
341deefe PR	359	if (pdata->x_plate_ohms == 0) {
341deefe PR	360	dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
07f9e5cf	361	return -EINVAL;
341deefe PR	362	}
341deefe PR	363
07f9e5cf DC	364	return 0;
	365	}
	366
fd91a5f0 DT	367	static void tsc2007_call_exit_platform_hw(void *data)
	368	{
	369	struct device *dev = data;
	370	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
	371
	372	pdata->exit_platform_hw();
	373	}
	374
07f9e5cf DC	375	static int tsc2007_probe(struct i2c_client *client,
	376	const struct i2c_device_id *id)
	377	{
	378	const struct tsc2007_platform_data *pdata = dev_get_platdata(&client->dev);
	379	struct tsc2007 *ts;
	380	struct input_dev *input_dev;
	381	int err;
	382
	383	if (!i2c_check_functionality(client->adapter,
	384	I2C_FUNC_SMBUS_READ_WORD_DATA))
	385	return -EIO;
	386
	387	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
	388	if (!ts)
	389	return -ENOMEM;
	390
	391	if (pdata)
	392	err = tsc2007_probe_pdev(client, ts, pdata, id);
	393	else
	394	err = tsc2007_probe_dt(client, ts);
	395	if (err)
	396	return err;
	397
fd91a5f0 DT	398	input_dev = devm_input_allocate_device(&client->dev);
	399	if (!input_dev)
	400	return -ENOMEM;
07f9e5cf DC	401
	402	i2c_set_clientdata(client, ts);
	403
	404	ts->client = client;
	405	ts->irq = client->irq;
	406	ts->input = input_dev;
	407	init_waitqueue_head(&ts->wait);
	408
4e8718a1 KS	409	snprintf(ts->phys, sizeof(ts->phys),
4e8718a1 KS	410	"%s/input0", dev_name(&client->dev));
50b6f1f4 KL	411
	412	input_dev->name = "TSC2007 Touchscreen";
	413	input_dev->phys = ts->phys;
	414	input_dev->id.bustype = BUS_I2C;
	415
d3654d7e DT	416	input_dev->open = tsc2007_open;
	417	input_dev->close = tsc2007_close;
	418
	419	input_set_drvdata(input_dev, ts);
	420
50b6f1f4 KL	421	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	422	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	423
07f9e5cf DC	424	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
07f9e5cf DC	425	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
891e376b	426	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
07f9e5cf	427	ts->fuzzz, 0);
50b6f1f4	428
fd91a5f0 DT	429	if (pdata) {
	430	if (pdata->exit_platform_hw) {
	431	err = devm_add_action(&client->dev,
	432	tsc2007_call_exit_platform_hw,
	433	&client->dev);
	434	if (err) {
	435	dev_err(&client->dev,
	436	"Failed to register exit_platform_hw action, %d\n",
	437	err);
	438	return err;
	439	}
	440	}
	441
	442	if (pdata->init_platform_hw)
	443	pdata->init_platform_hw();
	444	}
75fba3b0	445
fd91a5f0 DT	446	err = devm_request_threaded_irq(&client->dev, ts->irq,
	447	tsc2007_hard_irq, tsc2007_soft_irq,
	448	IRQF_ONESHOT,
	449	client->dev.driver->name, ts);
	450	if (err) {
	451	dev_err(&client->dev, "Failed to request irq %d: %d\n",
	452	ts->irq, err);
	453	return err;
50b6f1f4 KL	454	}
50b6f1f4 KL	455
d3654d7e	456	tsc2007_stop(ts);
cf5f439b	457
50b6f1f4	458	err = input_register_device(input_dev);
fd91a5f0 DT	459	if (err) {
	460	dev_err(&client->dev,
	461	"Failed to register input device: %d\n", err);
	462	return err;
	463	}
50b6f1f4 KL	464
	465	return 0;
	466	}
	467
ce7b39a1	468	static const struct i2c_device_id tsc2007_idtable[] = {
50b6f1f4 KL	469	{ "tsc2007", 0 },
	470	{ }
	471	};
	472
	473	MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
	474
07f9e5cf DC	475	#ifdef CONFIG_OF
	476	static const struct of_device_id tsc2007_of_match[] = {
	477	{ .compatible = "ti,tsc2007" },
	478	{ /* sentinel */ }
	479	};
	480	MODULE_DEVICE_TABLE(of, tsc2007_of_match);
	481	#endif
	482
50b6f1f4 KL	483	static struct i2c_driver tsc2007_driver = {
	484	.driver = {
	485	.owner = THIS_MODULE,
07f9e5cf DC	486	.name = "tsc2007",
07f9e5cf DC	487	.of_match_table = of_match_ptr(tsc2007_of_match),
50b6f1f4 KL	488	},
	489	.id_table = tsc2007_idtable,
	490	.probe = tsc2007_probe,
50b6f1f4 KL	491	};
50b6f1f4 KL	492
1b92c1cf	493	module_i2c_driver(tsc2007_driver);
50b6f1f4 KL	494
	495	MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
	496	MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
	497	MODULE_LICENSE("GPL");