[mirror_ubuntu-bionic-kernel.git] / drivers / input / touchscreen / st1232.c

/*
 * 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.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

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

#define ST1232_TS_NAME	"st1232-ts"

#define MIN_X		0x00
#define MIN_Y		0x00
#define MAX_X		0x31f	/* (800 - 1) */
#define MAX_Y		0x1df	/* (480 - 1) */
#define MAX_AREA	0xff
#define MAX_FINGERS	2

struct st1232_ts_finger {
	u16 x;
	u16 y;
	u8 t;
	bool is_valid;
};

struct st1232_ts_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	struct st1232_ts_finger finger[MAX_FINGERS];
	struct dev_pm_qos_request low_latency_req;
	int reset_gpio;
};

static int st1232_ts_read_data(struct st1232_ts_data *ts)
{
	struct st1232_ts_finger *finger = ts->finger;
	struct i2c_client *client = ts->client;
	struct i2c_msg msg[2];
	int error;
	u8 start_reg;
	u8 buf[10];

	/* read touchscreen data from ST1232 */
	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = &start_reg;
	start_reg = 0x10;

	msg[1].addr = ts->client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].len = sizeof(buf);
	msg[1].buf = buf;

	error = i2c_transfer(client->adapter, msg, 2);
	if (error < 0)
		return error;

	/* get "valid" bits */
	finger[0].is_valid = buf[2] >> 7;
	finger[1].is_valid = buf[5] >> 7;

	/* get xy coordinate */
	if (finger[0].is_valid) {
		finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
		finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
		finger[0].t = buf[8];
	}

	if (finger[1].is_valid) {
		finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
		finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
		finger[1].t = buf[9];
	}

	return 0;
}

static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
{
	struct st1232_ts_data *ts = dev_id;
	struct st1232_ts_finger *finger = ts->finger;
	struct input_dev *input_dev = ts->input_dev;
	int count = 0;
	int i, ret;

	ret = st1232_ts_read_data(ts);
	if (ret < 0)
		goto end;

	/* multi touch protocol */
	for (i = 0; i < MAX_FINGERS; i++) {
		if (!finger[i].is_valid)
			continue;

		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
		input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
		input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
		input_mt_sync(input_dev);
		count++;
	}

	/* SYN_MT_REPORT only if no contact */
	if (!count) {
		input_mt_sync(input_dev);
		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);
	}

	/* SYN_REPORT */
	input_sync(input_dev);

end:
	return IRQ_HANDLED;
}

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

static int st1232_ts_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct st1232_ts_data *ts;
	struct input_dev *input_dev;
	int error;

	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;

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

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

	ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
	if (gpio_is_valid(ts->reset_gpio)) {
		error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
		if (error) {
			dev_err(&client->dev,
				"Unable to request GPIO pin %d.\n",
				ts->reset_gpio);
				return error;
		}
	}

	st1232_ts_power(ts, true);

	input_dev->name = "st1232-touchscreen";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
	__set_bit(EV_SYN, input_dev->evbit);
	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(EV_ABS, input_dev->evbit);

	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);

	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);
	device_init_wakeup(&client->dev, 1);

	return 0;
}

static int st1232_ts_remove(struct i2c_client *client)
{
	struct st1232_ts_data *ts = i2c_get_clientdata(client);

	st1232_ts_power(ts, false);

	return 0;
}

static int __maybe_unused st1232_ts_suspend(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)) {
		enable_irq_wake(client->irq);
	} else {
		disable_irq(client->irq);
		st1232_ts_power(ts, false);
	}

	return 0;
}

static int __maybe_unused 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)) {
		disable_irq_wake(client->irq);
	} else {
		st1232_ts_power(ts, true);
		enable_irq(client->irq);
	}

	return 0;
}

static 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, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, st1232_ts_id);

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

static struct i2c_driver st1232_ts_driver = {
	.probe		= st1232_ts_probe,
	.remove		= st1232_ts_remove,
	.id_table	= st1232_ts_id,
	.driver = {
		.name	= ST1232_TS_NAME,
		.of_match_table = st1232_ts_dt_ids,
		.pm	= &st1232_ts_pm_ops,
	},
};

module_i2c_driver(st1232_ts_driver);

MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
56a8bd6d TS	1	/*
	2	* ST1232 Touchscreen Controller Driver
	3	*
	4	* Copyright (C) 2010 Renesas Solutions Corp.
	5	* Tony SIM <chinyeow.sim.xt@renesas.com>
	6	*
	7	* Using code from:
	8	* - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
	9	* Copyright (C) 2007 Google, Inc.
	10	*
	11	* This software is licensed under the terms of the GNU General Public
	12	* License version 2, as published by the Free Software Foundation, and
	13	* may be copied, distributed, and modified under those terms.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*/
	20
	21	#include <linux/delay.h>
e6a90810	22	#include <linux/gpio.h>
56a8bd6d TS	23	#include <linux/i2c.h>
	24	#include <linux/input.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/module.h>
4d6e4826	27	#include <linux/of.h>
e6a90810	28	#include <linux/of_gpio.h>
9ee27ffb	29	#include <linux/pm_qos.h>
56a8bd6d TS	30	#include <linux/slab.h>
	31	#include <linux/types.h>
	32
	33	#define ST1232_TS_NAME "st1232-ts"
	34
	35	#define MIN_X 0x00
	36	#define MIN_Y 0x00
	37	#define MAX_X 0x31f /* (800 - 1) */
	38	#define MAX_Y 0x1df /* (480 - 1) */
	39	#define MAX_AREA 0xff
	40	#define MAX_FINGERS 2
	41
	42	struct st1232_ts_finger {
	43	u16 x;
	44	u16 y;
	45	u8 t;
	46	bool is_valid;
	47	};
	48
	49	struct st1232_ts_data {
	50	struct i2c_client *client;
	51	struct input_dev *input_dev;
	52	struct st1232_ts_finger finger[MAX_FINGERS];
9ee27ffb	53	struct dev_pm_qos_request low_latency_req;
e6a90810	54	int reset_gpio;
56a8bd6d TS	55	};
	56
	57	static int st1232_ts_read_data(struct st1232_ts_data *ts)
	58	{
	59	struct st1232_ts_finger *finger = ts->finger;
	60	struct i2c_client *client = ts->client;
	61	struct i2c_msg msg[2];
	62	int error;
	63	u8 start_reg;
	64	u8 buf[10];
	65
	66	/* read touchscreen data from ST1232 */
	67	msg[0].addr = client->addr;
	68	msg[0].flags = 0;
	69	msg[0].len = 1;
	70	msg[0].buf = &start_reg;
	71	start_reg = 0x10;
	72
	73	msg[1].addr = ts->client->addr;
	74	msg[1].flags = I2C_M_RD;
	75	msg[1].len = sizeof(buf);
	76	msg[1].buf = buf;
	77
	78	error = i2c_transfer(client->adapter, msg, 2);
	79	if (error < 0)
	80	return error;
	81
	82	/* get "valid" bits */
	83	finger[0].is_valid = buf[2] >> 7;
	84	finger[1].is_valid = buf[5] >> 7;
	85
	86	/* get xy coordinate */
	87	if (finger[0].is_valid) {
	88	finger[0].x = ((buf[2] & 0x0070) << 4) \| buf[3];
	89	finger[0].y = ((buf[2] & 0x0007) << 8) \| buf[4];
	90	finger[0].t = buf[8];
	91	}
	92
	93	if (finger[1].is_valid) {
	94	finger[1].x = ((buf[5] & 0x0070) << 4) \| buf[6];
	95	finger[1].y = ((buf[5] & 0x0007) << 8) \| buf[7];
	96	finger[1].t = buf[9];
	97	}
	98
	99	return 0;
	100	}
	101
	102	static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
	103	{
	104	struct st1232_ts_data *ts = dev_id;
	105	struct st1232_ts_finger *finger = ts->finger;
	106	struct input_dev *input_dev = ts->input_dev;
	107	int count = 0;
	108	int i, ret;
	109
	110	ret = st1232_ts_read_data(ts);
	111	if (ret < 0)
	112	goto end;
	113
	114	/* multi touch protocol */
	115	for (i = 0; i < MAX_FINGERS; i++) {
	116	if (!finger[i].is_valid)
	117	continue;
	118
119	input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
120	input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
121	input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
122	input_mt_sync(input_dev);
123	count++;
124	}
125
126	/* SYN_MT_REPORT only if no contact */
9ee27ffb	127	if (!count) {
56a8bd6d	128	input_mt_sync(input_dev);
9ee27ffb RW	129	if (ts->low_latency_req.dev) {
	130	dev_pm_qos_remove_request(&ts->low_latency_req);
	131	ts->low_latency_req.dev = NULL;
	132	}
	133	} else if (!ts->low_latency_req.dev) {
	134	/* First contact, request 100 us latency. */
	135	dev_pm_qos_add_ancestor_request(&ts->client->dev,
71d821fd RW	136	&ts->low_latency_req,
71d821fd RW	137	DEV_PM_QOS_RESUME_LATENCY, 100);
9ee27ffb	138	}
56a8bd6d TS	139
	140	/* SYN_REPORT */
	141	input_sync(input_dev);
	142
	143	end:
	144	return IRQ_HANDLED;
	145	}
	146
e6a90810 BH	147	static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
	148	{
	149	if (gpio_is_valid(ts->reset_gpio))
	150	gpio_direction_output(ts->reset_gpio, poweron);
	151	}
	152
5298cc4c	153	static int st1232_ts_probe(struct i2c_client *client,
4a1a57df	154	const struct i2c_device_id *id)
56a8bd6d TS	155	{
	156	struct st1232_ts_data *ts;
	157	struct input_dev *input_dev;
	158	int error;
	159
	160	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	161	dev_err(&client->dev, "need I2C_FUNC_I2C\n");
	162	return -EIO;
	163	}
	164
	165	if (!client->irq) {
	166	dev_err(&client->dev, "no IRQ?\n");
	167	return -EINVAL;
	168	}
	169
95b24d22 LP	170	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
	171	if (!ts)
	172	return -ENOMEM;
56a8bd6d	173
95b24d22 LP	174	input_dev = devm_input_allocate_device(&client->dev);
	175	if (!input_dev)
	176	return -ENOMEM;
56a8bd6d TS	177
	178	ts->client = client;
	179	ts->input_dev = input_dev;
	180
4a1a57df	181	ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
e6a90810 BH	182	if (gpio_is_valid(ts->reset_gpio)) {
	183	error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
	184	if (error) {
	185	dev_err(&client->dev,
	186	"Unable to request GPIO pin %d.\n",
	187	ts->reset_gpio);
	188	return error;
	189	}
	190	}
	191
	192	st1232_ts_power(ts, true);
	193
56a8bd6d TS	194	input_dev->name = "st1232-touchscreen";
	195	input_dev->id.bustype = BUS_I2C;
	196	input_dev->dev.parent = &client->dev;
	197
7458616b	198	__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
56a8bd6d TS	199	__set_bit(EV_SYN, input_dev->evbit);
	200	__set_bit(EV_KEY, input_dev->evbit);
	201	__set_bit(EV_ABS, input_dev->evbit);
	202
	203	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
	204	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
	205	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
	206
95b24d22 LP	207	error = devm_request_threaded_irq(&client->dev, client->irq,
	208	NULL, st1232_ts_irq_handler,
	209	IRQF_ONESHOT,
	210	client->name, ts);
56a8bd6d TS	211	if (error) {
56a8bd6d TS	212	dev_err(&client->dev, "Failed to register interrupt\n");
95b24d22	213	return error;
56a8bd6d TS	214	}
	215
	216	error = input_register_device(ts->input_dev);
	217	if (error) {
	218	dev_err(&client->dev, "Unable to register %s input device\n",
	219	input_dev->name);
95b24d22	220	return error;
56a8bd6d TS	221	}
	222
	223	i2c_set_clientdata(client, ts);
	224	device_init_wakeup(&client->dev, 1);
	225
	226	return 0;
56a8bd6d TS	227	}
56a8bd6d TS	228
e2619cf7	229	static int st1232_ts_remove(struct i2c_client *client)
56a8bd6d	230	{
e6a90810 BH	231	struct st1232_ts_data *ts = i2c_get_clientdata(client);
e6a90810 BH	232
e6a90810	233	st1232_ts_power(ts, false);
56a8bd6d TS	234
	235	return 0;
	236	}
	237
02b6a58b	238	static int __maybe_unused st1232_ts_suspend(struct device *dev)
56a8bd6d TS	239	{
56a8bd6d TS	240	struct i2c_client *client = to_i2c_client(dev);
e6a90810	241	struct st1232_ts_data *ts = i2c_get_clientdata(client);
56a8bd6d	242
e6a90810	243	if (device_may_wakeup(&client->dev)) {
56a8bd6d	244	enable_irq_wake(client->irq);
e6a90810	245	} else {
56a8bd6d	246	disable_irq(client->irq);
e6a90810 BH	247	st1232_ts_power(ts, false);
e6a90810 BH	248	}
56a8bd6d TS	249
	250	return 0;
	251	}
	252
02b6a58b	253	static int __maybe_unused st1232_ts_resume(struct device *dev)
56a8bd6d TS	254	{
56a8bd6d TS	255	struct i2c_client *client = to_i2c_client(dev);
e6a90810	256	struct st1232_ts_data *ts = i2c_get_clientdata(client);
56a8bd6d	257
e6a90810	258	if (device_may_wakeup(&client->dev)) {
56a8bd6d	259	disable_irq_wake(client->irq);
e6a90810 BH	260	} else {
e6a90810 BH	261	st1232_ts_power(ts, true);
56a8bd6d	262	enable_irq(client->irq);
e6a90810	263	}
56a8bd6d TS	264
	265	return 0;
	266	}
	267
b3571400 DT	268	static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
	269	st1232_ts_suspend, st1232_ts_resume);
	270
56a8bd6d TS	271	static const struct i2c_device_id st1232_ts_id[] = {
	272	{ ST1232_TS_NAME, 0 },
	273	{ }
	274	};
	275	MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
	276
78f50c24	277	static const struct of_device_id st1232_ts_dt_ids[] = {
e6293d2f MD	278	{ .compatible = "sitronix,st1232", },
	279	{ }
	280	};
	281	MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
e6293d2f	282
56a8bd6d TS	283	static struct i2c_driver st1232_ts_driver = {
56a8bd6d TS	284	.probe = st1232_ts_probe,
1cb0aa88	285	.remove = st1232_ts_remove,
56a8bd6d TS	286	.id_table = st1232_ts_id,
	287	.driver = {
	288	.name = ST1232_TS_NAME,
4a1a57df	289	.of_match_table = st1232_ts_dt_ids,
56a8bd6d	290	.pm = &st1232_ts_pm_ops,
56a8bd6d TS	291	},
	292	};
	293
1b92c1cf	294	module_i2c_driver(st1232_ts_driver);
56a8bd6d TS	295
	296	MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
	297	MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
	298	MODULE_LICENSE("GPL");