[deliverable/linux.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>
#include <linux/platform_data/st1232_pdata.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 st1232_pdata *pdata = dev_get_platdata(&client->dev);
	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;

	if (pdata)
		ts->reset_gpio = pdata->reset_gpio;
	else if (client->dev.of_node)
		ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
	else
		ts->reset_gpio = -ENODEV;

	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(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);

	device_init_wakeup(&client->dev, 0);
	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);

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

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 = of_match_ptr(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>
56a8bd6d TS	31	#include <linux/types.h>
e6a90810	32	#include <linux/platform_data/st1232_pdata.h>
56a8bd6d TS	33
	34	#define ST1232_TS_NAME "st1232-ts"
	35
	36	#define MIN_X 0x00
	37	#define MIN_Y 0x00
	38	#define MAX_X 0x31f /* (800 - 1) */
	39	#define MAX_Y 0x1df /* (480 - 1) */
	40	#define MAX_AREA 0xff
	41	#define MAX_FINGERS 2
	42
	43	struct st1232_ts_finger {
	44	u16 x;
	45	u16 y;
	46	u8 t;
	47	bool is_valid;
	48	};
	49
	50	struct st1232_ts_data {
	51	struct i2c_client *client;
	52	struct input_dev *input_dev;
	53	struct st1232_ts_finger finger[MAX_FINGERS];
9ee27ffb	54	struct dev_pm_qos_request low_latency_req;
e6a90810	55	int reset_gpio;
56a8bd6d TS	56	};
	57
	58	static int st1232_ts_read_data(struct st1232_ts_data *ts)
	59	{
	60	struct st1232_ts_finger *finger = ts->finger;
	61	struct i2c_client *client = ts->client;
	62	struct i2c_msg msg[2];
	63	int error;
	64	u8 start_reg;
	65	u8 buf[10];
	66
	67	/* read touchscreen data from ST1232 */
	68	msg[0].addr = client->addr;
	69	msg[0].flags = 0;
	70	msg[0].len = 1;
	71	msg[0].buf = &start_reg;
	72	start_reg = 0x10;
	73
	74	msg[1].addr = ts->client->addr;
	75	msg[1].flags = I2C_M_RD;
	76	msg[1].len = sizeof(buf);
	77	msg[1].buf = buf;
	78
	79	error = i2c_transfer(client->adapter, msg, 2);
	80	if (error < 0)
	81	return error;
	82
	83	/* get "valid" bits */
	84	finger[0].is_valid = buf[2] >> 7;
	85	finger[1].is_valid = buf[5] >> 7;
	86
	87	/* get xy coordinate */
	88	if (finger[0].is_valid) {
	89	finger[0].x = ((buf[2] & 0x0070) << 4) \| buf[3];
	90	finger[0].y = ((buf[2] & 0x0007) << 8) \| buf[4];
	91	finger[0].t = buf[8];
	92	}
	93
	94	if (finger[1].is_valid) {
	95	finger[1].x = ((buf[5] & 0x0070) << 4) \| buf[6];
	96	finger[1].y = ((buf[5] & 0x0007) << 8) \| buf[7];
	97	finger[1].t = buf[9];
	98	}
	99
	100	return 0;
	101	}
	102
	103	static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
	104	{
	105	struct st1232_ts_data *ts = dev_id;
	106	struct st1232_ts_finger *finger = ts->finger;
	107	struct input_dev *input_dev = ts->input_dev;
	108	int count = 0;
	109	int i, ret;
	110
	111	ret = st1232_ts_read_data(ts);
	112	if (ret < 0)
	113	goto end;
	114
	115	/* multi touch protocol */
	116	for (i = 0; i < MAX_FINGERS; i++) {
	117	if (!finger[i].is_valid)
	118	continue;
	119
120	input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
121	input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
122	input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
123	input_mt_sync(input_dev);
124	count++;
125	}
126
127	/* SYN_MT_REPORT only if no contact */
9ee27ffb	128	if (!count) {
56a8bd6d	129	input_mt_sync(input_dev);
9ee27ffb RW	130	if (ts->low_latency_req.dev) {
	131	dev_pm_qos_remove_request(&ts->low_latency_req);
	132	ts->low_latency_req.dev = NULL;
	133	}
	134	} else if (!ts->low_latency_req.dev) {
	135	/* First contact, request 100 us latency. */
	136	dev_pm_qos_add_ancestor_request(&ts->client->dev,
71d821fd RW	137	&ts->low_latency_req,
71d821fd RW	138	DEV_PM_QOS_RESUME_LATENCY, 100);
9ee27ffb	139	}
56a8bd6d TS	140
	141	/* SYN_REPORT */
	142	input_sync(input_dev);
	143
	144	end:
	145	return IRQ_HANDLED;
	146	}
	147
e6a90810 BH	148	static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
	149	{
	150	if (gpio_is_valid(ts->reset_gpio))
	151	gpio_direction_output(ts->reset_gpio, poweron);
	152	}
	153
5298cc4c	154	static int st1232_ts_probe(struct i2c_client *client,
56a8bd6d TS	155	const struct i2c_device_id *id)
	156	{
	157	struct st1232_ts_data *ts;
c838cb3d	158	struct st1232_pdata *pdata = dev_get_platdata(&client->dev);
56a8bd6d TS	159	struct input_dev *input_dev;
	160	int error;
	161
	162	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	163	dev_err(&client->dev, "need I2C_FUNC_I2C\n");
	164	return -EIO;
	165	}
	166
	167	if (!client->irq) {
	168	dev_err(&client->dev, "no IRQ?\n");
	169	return -EINVAL;
	170	}
	171
95b24d22 LP	172	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
	173	if (!ts)
	174	return -ENOMEM;
56a8bd6d	175
95b24d22 LP	176	input_dev = devm_input_allocate_device(&client->dev);
	177	if (!input_dev)
	178	return -ENOMEM;
56a8bd6d TS	179
	180	ts->client = client;
	181	ts->input_dev = input_dev;
	182
e6a90810 BH	183	if (pdata)
	184	ts->reset_gpio = pdata->reset_gpio;
	185	else if (client->dev.of_node)
	186	ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
	187	else
	188	ts->reset_gpio = -ENODEV;
	189
	190	if (gpio_is_valid(ts->reset_gpio)) {
	191	error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
	192	if (error) {
	193	dev_err(&client->dev,
	194	"Unable to request GPIO pin %d.\n",
	195	ts->reset_gpio);
	196	return error;
	197	}
	198	}
	199
	200	st1232_ts_power(ts, true);
	201
56a8bd6d TS	202	input_dev->name = "st1232-touchscreen";
	203	input_dev->id.bustype = BUS_I2C;
	204	input_dev->dev.parent = &client->dev;
	205
	206	__set_bit(EV_SYN, input_dev->evbit);
	207	__set_bit(EV_KEY, input_dev->evbit);
	208	__set_bit(EV_ABS, input_dev->evbit);
	209
	210	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
	211	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
	212	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
	213
95b24d22 LP	214	error = devm_request_threaded_irq(&client->dev, client->irq,
	215	NULL, st1232_ts_irq_handler,
	216	IRQF_ONESHOT,
	217	client->name, ts);
56a8bd6d TS	218	if (error) {
56a8bd6d TS	219	dev_err(&client->dev, "Failed to register interrupt\n");
95b24d22	220	return error;
56a8bd6d TS	221	}
	222
	223	error = input_register_device(ts->input_dev);
	224	if (error) {
	225	dev_err(&client->dev, "Unable to register %s input device\n",
	226	input_dev->name);
95b24d22	227	return error;
56a8bd6d TS	228	}
	229
	230	i2c_set_clientdata(client, ts);
	231	device_init_wakeup(&client->dev, 1);
	232
	233	return 0;
56a8bd6d TS	234	}
56a8bd6d TS	235
e2619cf7	236	static int st1232_ts_remove(struct i2c_client *client)
56a8bd6d	237	{
e6a90810 BH	238	struct st1232_ts_data *ts = i2c_get_clientdata(client);
e6a90810 BH	239
56a8bd6d	240	device_init_wakeup(&client->dev, 0);
e6a90810	241	st1232_ts_power(ts, false);
56a8bd6d TS	242
	243	return 0;
	244	}
	245
02b6a58b	246	static int __maybe_unused st1232_ts_suspend(struct device *dev)
56a8bd6d TS	247	{
56a8bd6d TS	248	struct i2c_client *client = to_i2c_client(dev);
e6a90810	249	struct st1232_ts_data *ts = i2c_get_clientdata(client);
56a8bd6d	250
e6a90810	251	if (device_may_wakeup(&client->dev)) {
56a8bd6d	252	enable_irq_wake(client->irq);
e6a90810	253	} else {
56a8bd6d	254	disable_irq(client->irq);
e6a90810 BH	255	st1232_ts_power(ts, false);
e6a90810 BH	256	}
56a8bd6d TS	257
	258	return 0;
	259	}
	260
02b6a58b	261	static int __maybe_unused st1232_ts_resume(struct device *dev)
56a8bd6d TS	262	{
56a8bd6d TS	263	struct i2c_client *client = to_i2c_client(dev);
e6a90810	264	struct st1232_ts_data *ts = i2c_get_clientdata(client);
56a8bd6d	265
e6a90810	266	if (device_may_wakeup(&client->dev)) {
56a8bd6d	267	disable_irq_wake(client->irq);
e6a90810 BH	268	} else {
e6a90810 BH	269	st1232_ts_power(ts, true);
56a8bd6d	270	enable_irq(client->irq);
e6a90810	271	}
56a8bd6d TS	272
	273	return 0;
	274	}
	275
b3571400 DT	276	static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
	277	st1232_ts_suspend, st1232_ts_resume);
	278
56a8bd6d TS	279	static const struct i2c_device_id st1232_ts_id[] = {
	280	{ ST1232_TS_NAME, 0 },
	281	{ }
	282	};
	283	MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
	284
e6293d2f	285	#ifdef CONFIG_OF
78f50c24	286	static const struct of_device_id st1232_ts_dt_ids[] = {
e6293d2f MD	287	{ .compatible = "sitronix,st1232", },
	288	{ }
	289	};
	290	MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
	291	#endif
	292
56a8bd6d TS	293	static struct i2c_driver st1232_ts_driver = {
56a8bd6d TS	294	.probe = st1232_ts_probe,
1cb0aa88	295	.remove = st1232_ts_remove,
56a8bd6d TS	296	.id_table = st1232_ts_id,
	297	.driver = {
	298	.name = ST1232_TS_NAME,
e6293d2f	299	.of_match_table = of_match_ptr(st1232_ts_dt_ids),
56a8bd6d	300	.pm = &st1232_ts_pm_ops,
56a8bd6d TS	301	},
	302	};
	303
1b92c1cf	304	module_i2c_driver(st1232_ts_driver);
56a8bd6d TS	305
	306	MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
	307	MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
	308	MODULE_LICENSE("GPL");