[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/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.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;
};

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, 100);
	}

	/* SYN_REPORT */
	input_sync(input_dev);

end:
	return IRQ_HANDLED;
}

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;

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

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int st1232_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);
	else
		disable_irq(client->irq);

	return 0;
}

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

	if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);
	else
		enable_irq(client->irq);

	return 0;
}

#endif

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,
		.owner	= THIS_MODULE,
		.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>
	22	#include <linux/i2c.h>
	23	#include <linux/input.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/module.h>
9ee27ffb	26	#include <linux/pm_qos.h>
56a8bd6d TS	27	#include <linux/slab.h>
	28	#include <linux/types.h>
	29
	30	#define ST1232_TS_NAME "st1232-ts"
	31
	32	#define MIN_X 0x00
	33	#define MIN_Y 0x00
	34	#define MAX_X 0x31f /* (800 - 1) */
	35	#define MAX_Y 0x1df /* (480 - 1) */
	36	#define MAX_AREA 0xff
	37	#define MAX_FINGERS 2
	38
	39	struct st1232_ts_finger {
	40	u16 x;
	41	u16 y;
	42	u8 t;
	43	bool is_valid;
	44	};
	45
	46	struct st1232_ts_data {
	47	struct i2c_client *client;
	48	struct input_dev *input_dev;
	49	struct st1232_ts_finger finger[MAX_FINGERS];
9ee27ffb	50	struct dev_pm_qos_request low_latency_req;
56a8bd6d TS	51	};
	52
	53	static int st1232_ts_read_data(struct st1232_ts_data *ts)
	54	{
	55	struct st1232_ts_finger *finger = ts->finger;
	56	struct i2c_client *client = ts->client;
	57	struct i2c_msg msg[2];
	58	int error;
	59	u8 start_reg;
	60	u8 buf[10];
	61
	62	/* read touchscreen data from ST1232 */
	63	msg[0].addr = client->addr;
	64	msg[0].flags = 0;
	65	msg[0].len = 1;
	66	msg[0].buf = &start_reg;
	67	start_reg = 0x10;
	68
	69	msg[1].addr = ts->client->addr;
	70	msg[1].flags = I2C_M_RD;
	71	msg[1].len = sizeof(buf);
	72	msg[1].buf = buf;
	73
	74	error = i2c_transfer(client->adapter, msg, 2);
	75	if (error < 0)
	76	return error;
	77
	78	/* get "valid" bits */
	79	finger[0].is_valid = buf[2] >> 7;
	80	finger[1].is_valid = buf[5] >> 7;
	81
	82	/* get xy coordinate */
	83	if (finger[0].is_valid) {
	84	finger[0].x = ((buf[2] & 0x0070) << 4) \| buf[3];
	85	finger[0].y = ((buf[2] & 0x0007) << 8) \| buf[4];
	86	finger[0].t = buf[8];
	87	}
	88
	89	if (finger[1].is_valid) {
	90	finger[1].x = ((buf[5] & 0x0070) << 4) \| buf[6];
	91	finger[1].y = ((buf[5] & 0x0007) << 8) \| buf[7];
	92	finger[1].t = buf[9];
	93	}
	94
	95	return 0;
	96	}
	97
	98	static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
	99	{
	100	struct st1232_ts_data *ts = dev_id;
	101	struct st1232_ts_finger *finger = ts->finger;
	102	struct input_dev *input_dev = ts->input_dev;
	103	int count = 0;
	104	int i, ret;
	105
	106	ret = st1232_ts_read_data(ts);
	107	if (ret < 0)
	108	goto end;
	109
	110	/* multi touch protocol */
	111	for (i = 0; i < MAX_FINGERS; i++) {
	112	if (!finger[i].is_valid)
	113	continue;
	114
115	input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
116	input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
117	input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
118	input_mt_sync(input_dev);
119	count++;
120	}
121
122	/* SYN_MT_REPORT only if no contact */
9ee27ffb	123	if (!count) {
56a8bd6d	124	input_mt_sync(input_dev);
9ee27ffb RW	125	if (ts->low_latency_req.dev) {
	126	dev_pm_qos_remove_request(&ts->low_latency_req);
	127	ts->low_latency_req.dev = NULL;
	128	}
	129	} else if (!ts->low_latency_req.dev) {
	130	/* First contact, request 100 us latency. */
	131	dev_pm_qos_add_ancestor_request(&ts->client->dev,
	132	&ts->low_latency_req, 100);
	133	}
56a8bd6d TS	134
	135	/* SYN_REPORT */
	136	input_sync(input_dev);
	137
	138	end:
	139	return IRQ_HANDLED;
	140	}
	141
5298cc4c	142	static int st1232_ts_probe(struct i2c_client *client,
56a8bd6d TS	143	const struct i2c_device_id *id)
	144	{
	145	struct st1232_ts_data *ts;
	146	struct input_dev *input_dev;
	147	int error;
	148
	149	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	150	dev_err(&client->dev, "need I2C_FUNC_I2C\n");
	151	return -EIO;
	152	}
	153
	154	if (!client->irq) {
	155	dev_err(&client->dev, "no IRQ?\n");
	156	return -EINVAL;
	157	}
	158
95b24d22 LP	159	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
	160	if (!ts)
	161	return -ENOMEM;
56a8bd6d	162
95b24d22 LP	163	input_dev = devm_input_allocate_device(&client->dev);
	164	if (!input_dev)
	165	return -ENOMEM;
56a8bd6d TS	166
	167	ts->client = client;
	168	ts->input_dev = input_dev;
	169
	170	input_dev->name = "st1232-touchscreen";
	171	input_dev->id.bustype = BUS_I2C;
	172	input_dev->dev.parent = &client->dev;
	173
	174	__set_bit(EV_SYN, input_dev->evbit);
	175	__set_bit(EV_KEY, input_dev->evbit);
	176	__set_bit(EV_ABS, input_dev->evbit);
	177
	178	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
	179	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
	180	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
	181
95b24d22 LP	182	error = devm_request_threaded_irq(&client->dev, client->irq,
	183	NULL, st1232_ts_irq_handler,
	184	IRQF_ONESHOT,
	185	client->name, ts);
56a8bd6d TS	186	if (error) {
56a8bd6d TS	187	dev_err(&client->dev, "Failed to register interrupt\n");
95b24d22	188	return error;
56a8bd6d TS	189	}
	190
	191	error = input_register_device(ts->input_dev);
	192	if (error) {
	193	dev_err(&client->dev, "Unable to register %s input device\n",
	194	input_dev->name);
95b24d22	195	return error;
56a8bd6d TS	196	}
	197
	198	i2c_set_clientdata(client, ts);
	199	device_init_wakeup(&client->dev, 1);
	200
	201	return 0;
56a8bd6d TS	202	}
56a8bd6d TS	203
e2619cf7	204	static int st1232_ts_remove(struct i2c_client *client)
56a8bd6d	205	{
56a8bd6d	206	device_init_wakeup(&client->dev, 0);
56a8bd6d TS	207
	208	return 0;
	209	}
	210
b3571400	211	#ifdef CONFIG_PM_SLEEP
56a8bd6d TS	212	static int st1232_ts_suspend(struct device *dev)
	213	{
	214	struct i2c_client *client = to_i2c_client(dev);
	215
	216	if (device_may_wakeup(&client->dev))
	217	enable_irq_wake(client->irq);
	218	else
	219	disable_irq(client->irq);
	220
	221	return 0;
	222	}
	223
	224	static int st1232_ts_resume(struct device *dev)
	225	{
	226	struct i2c_client *client = to_i2c_client(dev);
	227
	228	if (device_may_wakeup(&client->dev))
	229	disable_irq_wake(client->irq);
	230	else
	231	enable_irq(client->irq);
	232
	233	return 0;
	234	}
	235
56a8bd6d TS	236	#endif
56a8bd6d TS	237
b3571400 DT	238	static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
	239	st1232_ts_suspend, st1232_ts_resume);
	240
56a8bd6d TS	241	static const struct i2c_device_id st1232_ts_id[] = {
	242	{ ST1232_TS_NAME, 0 },
	243	{ }
	244	};
	245	MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
	246
e6293d2f	247	#ifdef CONFIG_OF
78f50c24	248	static const struct of_device_id st1232_ts_dt_ids[] = {
e6293d2f MD	249	{ .compatible = "sitronix,st1232", },
	250	{ }
	251	};
	252	MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
	253	#endif
	254
56a8bd6d TS	255	static struct i2c_driver st1232_ts_driver = {
56a8bd6d TS	256	.probe = st1232_ts_probe,
1cb0aa88	257	.remove = st1232_ts_remove,
56a8bd6d TS	258	.id_table = st1232_ts_id,
	259	.driver = {
	260	.name = ST1232_TS_NAME,
	261	.owner = THIS_MODULE,
e6293d2f	262	.of_match_table = of_match_ptr(st1232_ts_dt_ids),
56a8bd6d	263	.pm = &st1232_ts_pm_ops,
56a8bd6d TS	264	},
	265	};
	266
1b92c1cf	267	module_i2c_driver(st1232_ts_driver);
56a8bd6d TS	268
	269	MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
	270	MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
	271	MODULE_LICENSE("GPL");