[linux-2.6-block.git] / drivers / input / touchscreen / st1232.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ST1232 Touchscreen Controller Driver
 *
 * Copyright (C) 2010 Renesas Solutions Corp.
 *	Tony SIM <chinyeow.sim.xt@renesas.com>
 *
 * Using code from:
 *  - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
 *	Copyright (C) 2007 Google, Inc.
 */

#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/types.h>

#define ST1232_TS_NAME	"st1232-ts"
#define ST1633_TS_NAME	"st1633-ts"

#define REG_STATUS		0x01	/* Device Status | Error Code */

#define STATUS_NORMAL		0x00
#define STATUS_INIT		0x01
#define STATUS_ERROR		0x02
#define STATUS_AUTO_TUNING	0x03
#define STATUS_IDLE		0x04
#define STATUS_POWER_DOWN	0x05

#define ERROR_NONE		0x00
#define ERROR_INVALID_ADDRESS	0x10
#define ERROR_INVALID_VALUE	0x20
#define ERROR_INVALID_PLATFORM	0x30

#define REG_XY_RESOLUTION	0x04
#define REG_XY_COORDINATES	0x12
#define ST_TS_MAX_FINGERS	10

struct st_chip_info {
	bool	have_z;
	u16	max_area;
	u16	max_fingers;
};

struct st1232_ts_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	struct touchscreen_properties prop;
	struct dev_pm_qos_request low_latency_req;
	struct gpio_desc *reset_gpio;
	const struct st_chip_info *chip_info;
	int read_buf_len;
	u8 *read_buf;
};

static int st1232_ts_read_data(struct st1232_ts_data *ts, u8 reg,
			       unsigned int n)
{
	struct i2c_client *client = ts->client;
	struct i2c_msg msg[] = {
		{
			.addr	= client->addr,
			.len	= sizeof(reg),
			.buf	= &reg,
		},
		{
			.addr	= client->addr,
			.flags	= I2C_M_RD | I2C_M_DMA_SAFE,
			.len	= n,
			.buf	= ts->read_buf,
		}
	};
	int ret;

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret != ARRAY_SIZE(msg))
		return ret < 0 ? ret : -EIO;

	return 0;
}

static int st1232_ts_wait_ready(struct st1232_ts_data *ts)
{
	unsigned int retries;
	int error;

	for (retries = 100; retries; retries--) {
		error = st1232_ts_read_data(ts, REG_STATUS, 1);
		if (!error) {
			switch (ts->read_buf[0]) {
			case STATUS_NORMAL | ERROR_NONE:
			case STATUS_IDLE | ERROR_NONE:
				return 0;
			}
		}

		usleep_range(1000, 2000);
	}

	return -ENXIO;
}

static int st1232_ts_read_resolution(struct st1232_ts_data *ts, u16 *max_x,
				     u16 *max_y)
{
	u8 *buf;
	int error;

	/* select resolution register */
	error = st1232_ts_read_data(ts, REG_XY_RESOLUTION, 3);
	if (error)
		return error;

	buf = ts->read_buf;

	*max_x = (((buf[0] & 0x0070) << 4) | buf[1]) - 1;
	*max_y = (((buf[0] & 0x0007) << 8) | buf[2]) - 1;

	return 0;
}

static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
{
	struct input_dev *input = ts->input_dev;
	struct input_mt_pos pos[ST_TS_MAX_FINGERS];
	u8 z[ST_TS_MAX_FINGERS];
	int slots[ST_TS_MAX_FINGERS];
	int n_contacts = 0;
	int i;

	for (i = 0; i < ts->chip_info->max_fingers; i++) {
		u8 *buf = &ts->read_buf[i * 4];

		if (buf[0] & BIT(7)) {
			unsigned int x = ((buf[0] & 0x70) << 4) | buf[1];
			unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];

			touchscreen_set_mt_pos(&pos[n_contacts],
					       &ts->prop, x, y);

			/* st1232 includes a z-axis / touch strength */
			if (ts->chip_info->have_z)
				z[n_contacts] = ts->read_buf[i + 6];

			n_contacts++;
		}
	}

	input_mt_assign_slots(input, slots, pos, n_contacts, 0);
	for (i = 0; i < n_contacts; i++) {
		input_mt_slot(input, slots[i]);
		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
		input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
		input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
		if (ts->chip_info->have_z)
			input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]);
	}

	input_mt_sync_frame(input);
	input_sync(input);

	return n_contacts;
}

static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
{
	struct st1232_ts_data *ts = dev_id;
	int count;
	int error;

	error = st1232_ts_read_data(ts, REG_XY_COORDINATES, ts->read_buf_len);
	if (error)
		goto out;

	count = st1232_ts_parse_and_report(ts);
	if (!count) {
		if (ts->low_latency_req.dev) {
			dev_pm_qos_remove_request(&ts->low_latency_req);
			ts->low_latency_req.dev = NULL;
		}
	} else if (!ts->low_latency_req.dev) {
		/* First contact, request 100 us latency. */
		dev_pm_qos_add_ancestor_request(&ts->client->dev,
						&ts->low_latency_req,
						DEV_PM_QOS_RESUME_LATENCY, 100);
	}

out:
	return IRQ_HANDLED;
}

static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
{
	if (ts->reset_gpio)
		gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
}

static void st1232_ts_power_off(void *data)
{
	st1232_ts_power(data, false);
}

static const struct st_chip_info st1232_chip_info = {
	.have_z		= true,
	.max_area	= 0xff,
	.max_fingers	= 2,
};

static const struct st_chip_info st1633_chip_info = {
	.have_z		= false,
	.max_area	= 0x00,
	.max_fingers	= 5,
};

static int st1232_ts_probe(struct i2c_client *client)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(client);
	const struct st_chip_info *match;
	struct st1232_ts_data *ts;
	struct input_dev *input_dev;
	u16 max_x, max_y;
	int error;

	match = device_get_match_data(&client->dev);
	if (!match && id)
		match = (const void *)id->driver_data;
	if (!match) {
		dev_err(&client->dev, "unknown device model\n");
		return -ENODEV;
	}

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "need I2C_FUNC_I2C\n");
		return -EIO;
	}

	if (!client->irq) {
		dev_err(&client->dev, "no IRQ?\n");
		return -EINVAL;
	}

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

	ts->chip_info = match;

	/* allocate a buffer according to the number of registers to read */
	ts->read_buf_len = ts->chip_info->max_fingers * 4;
	ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
	if (!ts->read_buf)
		return -ENOMEM;

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

	ts->client = client;
	ts->input_dev = input_dev;

	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
						 GPIOD_OUT_HIGH);
	if (IS_ERR(ts->reset_gpio)) {
		error = PTR_ERR(ts->reset_gpio);
		dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
			error);
		return error;
	}

	st1232_ts_power(ts, true);

	error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
	if (error) {
		dev_err(&client->dev,
			"Failed to install power off action: %d\n", error);
		return error;
	}

	input_dev->name = "st1232-touchscreen";
	input_dev->id.bustype = BUS_I2C;

	/* Wait until device is ready */
	error = st1232_ts_wait_ready(ts);
	if (error)
		return error;

	/* Read resolution from the chip */
	error = st1232_ts_read_resolution(ts, &max_x, &max_y);
	if (error) {
		dev_err(&client->dev,
			"Failed to read resolution: %d\n", error);
		return error;
	}

	if (ts->chip_info->have_z)
		input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
				     ts->chip_info->max_area, 0, 0);

	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
			     0, max_x, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
			     0, max_y, 0, 0);

	touchscreen_parse_properties(input_dev, true, &ts->prop);

	error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers,
				    INPUT_MT_DIRECT | INPUT_MT_TRACK |
					INPUT_MT_DROP_UNUSED);
	if (error) {
		dev_err(&client->dev, "failed to initialize MT slots\n");
		return error;
	}

	error = devm_request_threaded_irq(&client->dev, client->irq,
					  NULL, st1232_ts_irq_handler,
					  IRQF_ONESHOT,
					  client->name, ts);
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		return error;
	}

	error = input_register_device(ts->input_dev);
	if (error) {
		dev_err(&client->dev, "Unable to register %s input device\n",
			input_dev->name);
		return error;
	}

	i2c_set_clientdata(client, ts);

	return 0;
}

static int st1232_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct st1232_ts_data *ts = i2c_get_clientdata(client);

	disable_irq(client->irq);

	if (!device_may_wakeup(&client->dev))
		st1232_ts_power(ts, false);

	return 0;
}

static int st1232_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct st1232_ts_data *ts = i2c_get_clientdata(client);

	if (!device_may_wakeup(&client->dev))
		st1232_ts_power(ts, true);

	enable_irq(client->irq);

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
				st1232_ts_suspend, st1232_ts_resume);

static const struct i2c_device_id st1232_ts_id[] = {
	{ ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
	{ ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
	{ }
};
MODULE_DEVICE_TABLE(i2c, st1232_ts_id);

static const struct of_device_id st1232_ts_dt_ids[] = {
	{ .compatible = "sitronix,st1232", .data = &st1232_chip_info },
	{ .compatible = "sitronix,st1633", .data = &st1633_chip_info },
	{ }
};
MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);

static struct i2c_driver st1232_ts_driver = {
	.probe		= st1232_ts_probe,
	.id_table	= st1232_ts_id,
	.driver = {
		.name	= ST1232_TS_NAME,
		.of_match_table = st1232_ts_dt_ids,
		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
		.pm	= pm_sleep_ptr(&st1232_ts_pm_ops),
	},
};

module_i2c_driver(st1232_ts_driver);

MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
4aeba641	1	// SPDX-License-Identifier: GPL-2.0
56a8bd6d TS	2	/*
	3	* ST1232 Touchscreen Controller Driver
	4	*
	5	* Copyright (C) 2010 Renesas Solutions Corp.
	6	* Tony SIM <chinyeow.sim.xt@renesas.com>
	7	*
	8	* Using code from:
	9	* - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
	10	* Copyright (C) 2007 Google, Inc.
56a8bd6d TS	11	*/
	12
	13	#include <linux/delay.h>
e3dd12f0	14	#include <linux/gpio/consumer.h>
56a8bd6d TS	15	#include <linux/i2c.h>
56a8bd6d TS	16	#include <linux/input.h>
a1b92973 DT	17	#include <linux/input/mt.h>
a1b92973 DT	18	#include <linux/input/touchscreen.h>
56a8bd6d TS	19	#include <linux/interrupt.h>
56a8bd6d TS	20	#include <linux/module.h>
4d6e4826	21	#include <linux/of.h>
9ee27ffb	22	#include <linux/pm_qos.h>
56a8bd6d TS	23	#include <linux/slab.h>
	24	#include <linux/types.h>
	25
	26	#define ST1232_TS_NAME "st1232-ts"
351e0592	27	#define ST1633_TS_NAME "st1633-ts"
56a8bd6d	28
f605be6a GU	29	#define REG_STATUS 0x01 /* Device Status \| Error Code */
	30
	31	#define STATUS_NORMAL 0x00
	32	#define STATUS_INIT 0x01
	33	#define STATUS_ERROR 0x02
	34	#define STATUS_AUTO_TUNING 0x03
	35	#define STATUS_IDLE 0x04
	36	#define STATUS_POWER_DOWN 0x05
	37
	38	#define ERROR_NONE 0x00
	39	#define ERROR_INVALID_ADDRESS 0x10
	40	#define ERROR_INVALID_VALUE 0x20
	41	#define ERROR_INVALID_PLATFORM 0x30
	42
3a54a215 AV	43	#define REG_XY_RESOLUTION 0x04
3a54a215 AV	44	#define REG_XY_COORDINATES 0x12
a1b92973	45	#define ST_TS_MAX_FINGERS 10
56a8bd6d	46
351e0592 MK	47	struct st_chip_info {
351e0592 MK	48	bool have_z;
351e0592 MK	49	u16 max_area;
351e0592 MK	50	u16 max_fingers;
351e0592 MK	51	};
351e0592 MK	52
56a8bd6d TS	53	struct st1232_ts_data {
	54	struct i2c_client *client;
	55	struct input_dev *input_dev;
16ab4f43	56	struct touchscreen_properties prop;
9ee27ffb	57	struct dev_pm_qos_request low_latency_req;
e3dd12f0	58	struct gpio_desc *reset_gpio;
351e0592 MK	59	const struct st_chip_info *chip_info;
	60	int read_buf_len;
	61	u8 *read_buf;
56a8bd6d TS	62	};
56a8bd6d TS	63
b999dbea GU	64	static int st1232_ts_read_data(struct st1232_ts_data *ts, u8 reg,
b999dbea GU	65	unsigned int n)
56a8bd6d	66	{
56a8bd6d	67	struct i2c_client *client = ts->client;
95c9ea96 DT	68	struct i2c_msg msg[] = {
	69	{
	70	.addr = client->addr,
3a54a215 AV	71	.len = sizeof(reg),
3a54a215 AV	72	.buf = &reg,
95c9ea96 DT	73	},
	74	{
	75	.addr = client->addr,
833c2c08	76	.flags = I2C_M_RD \| I2C_M_DMA_SAFE,
b999dbea	77	.len = n,
95c9ea96 DT	78	.buf = ts->read_buf,
	79	}
	80	};
	81	int ret;
56a8bd6d	82
95c9ea96 DT	83	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	84	if (ret != ARRAY_SIZE(msg))
	85	return ret < 0 ? ret : -EIO;
56a8bd6d	86
a1b92973 DT	87	return 0;
	88	}
	89
f605be6a GU	90	static int st1232_ts_wait_ready(struct st1232_ts_data *ts)
	91	{
	92	unsigned int retries;
	93	int error;
	94
2667f6b7	95	for (retries = 100; retries; retries--) {
f605be6a	96	error = st1232_ts_read_data(ts, REG_STATUS, 1);
1bff77f4 GU	97	if (!error) {
	98	switch (ts->read_buf[0]) {
	99	case STATUS_NORMAL \| ERROR_NONE:
	100	case STATUS_IDLE \| ERROR_NONE:
	101	return 0;
	102	}
	103	}
f605be6a GU	104
	105	usleep_range(1000, 2000);
	106	}
	107
	108	return -ENXIO;
	109	}
	110
3a54a215 AV	111	static int st1232_ts_read_resolution(struct st1232_ts_data ts, u16 max_x,
	112	u16 *max_y)
	113	{
	114	u8 *buf;
	115	int error;
	116
	117	/* select resolution register */
b999dbea	118	error = st1232_ts_read_data(ts, REG_XY_RESOLUTION, 3);
3a54a215 AV	119	if (error)
	120	return error;
	121
	122	buf = ts->read_buf;
	123
928eedf0 GU	124	*max_x = (((buf[0] & 0x0070) << 4) \| buf[1]) - 1;
928eedf0 GU	125	*max_y = (((buf[0] & 0x0007) << 8) \| buf[2]) - 1;
3a54a215 AV	126
	127	return 0;
	128	}
	129
a1b92973 DT	130	static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
	131	{
	132	struct input_dev *input = ts->input_dev;
	133	struct input_mt_pos pos[ST_TS_MAX_FINGERS];
	134	u8 z[ST_TS_MAX_FINGERS];
	135	int slots[ST_TS_MAX_FINGERS];
	136	int n_contacts = 0;
	137	int i;
	138
95c9ea96	139	for (i = 0; i < ts->chip_info->max_fingers; i++) {
a1b92973 DT	140	u8 buf = &ts->read_buf[i 4];
	141
	142	if (buf[0] & BIT(7)) {
	143	unsigned int x = ((buf[0] & 0x70) << 4) \| buf[1];
	144	unsigned int y = ((buf[0] & 0x07) << 8) \| buf[2];
	145
	146	touchscreen_set_mt_pos(&pos[n_contacts],
	147	&ts->prop, x, y);
56a8bd6d	148
351e0592 MK	149	/* st1232 includes a z-axis / touch strength */
351e0592 MK	150	if (ts->chip_info->have_z)
a1b92973 DT	151	z[n_contacts] = ts->read_buf[i + 6];
	152
	153	n_contacts++;
351e0592	154	}
56a8bd6d TS	155	}
56a8bd6d TS	156
a1b92973 DT	157	input_mt_assign_slots(input, slots, pos, n_contacts, 0);
	158	for (i = 0; i < n_contacts; i++) {
	159	input_mt_slot(input, slots[i]);
	160	input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
	161	input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
	162	input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
	163	if (ts->chip_info->have_z)
	164	input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]);
	165	}
	166
	167	input_mt_sync_frame(input);
	168	input_sync(input);
	169
	170	return n_contacts;
56a8bd6d TS	171	}
	172
	173	static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
	174	{
	175	struct st1232_ts_data *ts = dev_id;
a1b92973 DT	176	int count;
a1b92973 DT	177	int error;
56a8bd6d	178
b999dbea	179	error = st1232_ts_read_data(ts, REG_XY_COORDINATES, ts->read_buf_len);
a1b92973 DT	180	if (error)
a1b92973 DT	181	goto out;
351e0592	182
a1b92973	183	count = st1232_ts_parse_and_report(ts);
9ee27ffb	184	if (!count) {
9ee27ffb RW	185	if (ts->low_latency_req.dev) {
	186	dev_pm_qos_remove_request(&ts->low_latency_req);
	187	ts->low_latency_req.dev = NULL;
	188	}
	189	} else if (!ts->low_latency_req.dev) {
	190	/* First contact, request 100 us latency. */
	191	dev_pm_qos_add_ancestor_request(&ts->client->dev,
71d821fd RW	192	&ts->low_latency_req,
71d821fd RW	193	DEV_PM_QOS_RESUME_LATENCY, 100);
9ee27ffb	194	}
56a8bd6d	195
a1b92973	196	out:
56a8bd6d TS	197	return IRQ_HANDLED;
	198	}
	199
e6a90810 BH	200	static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
e6a90810 BH	201	{
e3dd12f0 MK	202	if (ts->reset_gpio)
e3dd12f0 MK	203	gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
e6a90810 BH	204	}
e6a90810 BH	205
efd7bb08 DT	206	static void st1232_ts_power_off(void *data)
	207	{
	208	st1232_ts_power(data, false);
	209	}
	210
351e0592 MK	211	static const struct st_chip_info st1232_chip_info = {
351e0592 MK	212	.have_z = true,
351e0592 MK	213	.max_area = 0xff,
351e0592 MK	214	.max_fingers = 2,
351e0592 MK	215	};
	216
	217	static const struct st_chip_info st1633_chip_info = {
	218	.have_z = false,
351e0592 MK	219	.max_area = 0x00,
351e0592 MK	220	.max_fingers = 5,
351e0592 MK	221	};
351e0592 MK	222
8ff48be3	223	static int st1232_ts_probe(struct i2c_client *client)
56a8bd6d	224	{
8ff48be3	225	const struct i2c_device_id *id = i2c_client_get_device_id(client);
351e0592	226	const struct st_chip_info *match;
56a8bd6d TS	227	struct st1232_ts_data *ts;
56a8bd6d TS	228	struct input_dev *input_dev;
3a54a215	229	u16 max_x, max_y;
56a8bd6d TS	230	int error;
56a8bd6d TS	231
351e0592 MK	232	match = device_get_match_data(&client->dev);
	233	if (!match && id)
	234	match = (const void *)id->driver_data;
	235	if (!match) {
	236	dev_err(&client->dev, "unknown device model\n");
	237	return -ENODEV;
	238	}
	239
56a8bd6d TS	240	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	241	dev_err(&client->dev, "need I2C_FUNC_I2C\n");
	242	return -EIO;
	243	}
	244
	245	if (!client->irq) {
	246	dev_err(&client->dev, "no IRQ?\n");
	247	return -EINVAL;
	248	}
	249
a1b92973	250	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
95b24d22 LP	251	if (!ts)
95b24d22 LP	252	return -ENOMEM;
56a8bd6d	253
351e0592	254	ts->chip_info = match;
351e0592 MK	255
	256	/* allocate a buffer according to the number of registers to read */
	257	ts->read_buf_len = ts->chip_info->max_fingers * 4;
	258	ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
	259	if (!ts->read_buf)
	260	return -ENOMEM;
	261
95b24d22 LP	262	input_dev = devm_input_allocate_device(&client->dev);
	263	if (!input_dev)
	264	return -ENOMEM;
56a8bd6d TS	265
	266	ts->client = client;
	267	ts->input_dev = input_dev;
	268
e3dd12f0 MK	269	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
	270	GPIOD_OUT_HIGH);
	271	if (IS_ERR(ts->reset_gpio)) {
	272	error = PTR_ERR(ts->reset_gpio);
	273	dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
	274	error);
	275	return error;
e6a90810 BH	276	}
	277
	278	st1232_ts_power(ts, true);
	279
efd7bb08 DT	280	error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
	281	if (error) {
	282	dev_err(&client->dev,
	283	"Failed to install power off action: %d\n", error);
	284	return error;
	285	}
	286
56a8bd6d TS	287	input_dev->name = "st1232-touchscreen";
56a8bd6d TS	288	input_dev->id.bustype = BUS_I2C;
56a8bd6d	289
f605be6a GU	290	/* Wait until device is ready */
	291	error = st1232_ts_wait_ready(ts);
	292	if (error)
	293	return error;
	294
3a54a215 AV	295	/* Read resolution from the chip */
	296	error = st1232_ts_read_resolution(ts, &max_x, &max_y);
	297	if (error) {
	298	dev_err(&client->dev,
	299	"Failed to read resolution: %d\n", error);
	300	return error;
	301	}
	302
351e0592 MK	303	if (ts->chip_info->have_z)
	304	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
	305	ts->chip_info->max_area, 0, 0);
	306
	307	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
3a54a215	308	0, max_x, 0, 0);
351e0592	309	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
3a54a215	310	0, max_y, 0, 0);
56a8bd6d	311
16ab4f43 MF	312	touchscreen_parse_properties(input_dev, true, &ts->prop);
16ab4f43 MF	313
a1b92973 DT	314	error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers,
	315	INPUT_MT_DIRECT \| INPUT_MT_TRACK \|
	316	INPUT_MT_DROP_UNUSED);
	317	if (error) {
	318	dev_err(&client->dev, "failed to initialize MT slots\n");
	319	return error;
	320	}
	321
95b24d22 LP	322	error = devm_request_threaded_irq(&client->dev, client->irq,
	323	NULL, st1232_ts_irq_handler,
	324	IRQF_ONESHOT,
	325	client->name, ts);
56a8bd6d TS	326	if (error) {
56a8bd6d TS	327	dev_err(&client->dev, "Failed to register interrupt\n");
95b24d22	328	return error;
56a8bd6d TS	329	}
	330
	331	error = input_register_device(ts->input_dev);
	332	if (error) {
	333	dev_err(&client->dev, "Unable to register %s input device\n",
	334	input_dev->name);
95b24d22	335	return error;
56a8bd6d TS	336	}
	337
	338	i2c_set_clientdata(client, ts);
56a8bd6d TS	339
56a8bd6d TS	340	return 0;
56a8bd6d TS	341	}
56a8bd6d TS	342
7c8d436d	343	static int st1232_ts_suspend(struct device *dev)
56a8bd6d TS	344	{
56a8bd6d TS	345	struct i2c_client *client = to_i2c_client(dev);
e6a90810	346	struct st1232_ts_data *ts = i2c_get_clientdata(client);
56a8bd6d	347
95dc58a9 DT	348	disable_irq(client->irq);
	349
	350	if (!device_may_wakeup(&client->dev))
e6a90810	351	st1232_ts_power(ts, false);
56a8bd6d TS	352
	353	return 0;
	354	}
	355
7c8d436d	356	static int st1232_ts_resume(struct device *dev)
56a8bd6d TS	357	{
56a8bd6d TS	358	struct i2c_client *client = to_i2c_client(dev);
e6a90810	359	struct st1232_ts_data *ts = i2c_get_clientdata(client);
56a8bd6d	360
95dc58a9	361	if (!device_may_wakeup(&client->dev))
e6a90810	362	st1232_ts_power(ts, true);
95dc58a9 DT	363
95dc58a9 DT	364	enable_irq(client->irq);
56a8bd6d TS	365
	366	return 0;
	367	}
	368
7c8d436d JC	369	static DEFINE_SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
7c8d436d JC	370	st1232_ts_suspend, st1232_ts_resume);
b3571400	371
56a8bd6d	372	static const struct i2c_device_id st1232_ts_id[] = {
351e0592 MK	373	{ ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
351e0592 MK	374	{ ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
56a8bd6d TS	375	{ }
	376	};
	377	MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
	378
78f50c24	379	static const struct of_device_id st1232_ts_dt_ids[] = {
351e0592 MK	380	{ .compatible = "sitronix,st1232", .data = &st1232_chip_info },
351e0592 MK	381	{ .compatible = "sitronix,st1633", .data = &st1633_chip_info },
e6293d2f MD	382	{ }
	383	};
	384	MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
e6293d2f	385
56a8bd6d	386	static struct i2c_driver st1232_ts_driver = {
d8bde56d	387	.probe = st1232_ts_probe,
56a8bd6d TS	388	.id_table = st1232_ts_id,
	389	.driver = {
	390	.name = ST1232_TS_NAME,
4a1a57df	391	.of_match_table = st1232_ts_dt_ids,
b415ed4f	392	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
7c8d436d	393	.pm = pm_sleep_ptr(&st1232_ts_pm_ops),
56a8bd6d TS	394	},
	395	};
	396
1b92c1cf	397	module_i2c_driver(st1232_ts_driver);
56a8bd6d TS	398
56a8bd6d TS	399	MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
4dbb7119	400	MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
56a8bd6d	401	MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
4aeba641	402	MODULE_LICENSE("GPL v2");