[linux-2.6-block.git] / drivers / input / touchscreen / cy8ctmg110_ts.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for cypress touch screen controller
 *
 * Copyright (c) 2009 Aava Mobile
 *
 * Some cleanups by Alan Cox <alan@linux.intel.com>
 */

#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/byteorder.h>

#define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"

/* Touch coordinates */
#define CY8CTMG110_X_MIN		0
#define CY8CTMG110_Y_MIN		0
#define CY8CTMG110_X_MAX		759
#define CY8CTMG110_Y_MAX		465


/* cy8ctmg110 register definitions */
#define CY8CTMG110_TOUCH_WAKEUP_TIME	0
#define CY8CTMG110_TOUCH_SLEEP_TIME	2
#define CY8CTMG110_TOUCH_X1		3
#define CY8CTMG110_TOUCH_Y1		5
#define CY8CTMG110_TOUCH_X2		7
#define CY8CTMG110_TOUCH_Y2		9
#define CY8CTMG110_FINGERS		11
#define CY8CTMG110_GESTURE		12
#define CY8CTMG110_REG_MAX		13


/*
 * The touch driver structure.
 */
struct cy8ctmg110 {
	struct input_dev *input;
	char phys[32];
	struct i2c_client *client;
	struct gpio_desc *reset_gpio;
};

/*
 * cy8ctmg110_power is the routine that is called when touch hardware
 * is being powered off or on. When powering on this routine de-asserts
 * the RESET line, when powering off reset line is asserted.
 */
static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
{
	if (ts->reset_gpio)
		gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
}

static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
		unsigned char len, unsigned char *value)
{
	struct i2c_client *client = tsc->client;
	int ret;
	unsigned char i2c_data[6];

	BUG_ON(len > 5);

	i2c_data[0] = reg;
	memcpy(i2c_data + 1, value, len);

	ret = i2c_master_send(client, i2c_data, len + 1);
	if (ret != len + 1) {
		dev_err(&client->dev, "i2c write data cmd failed\n");
		return ret < 0 ? ret : -EIO;
	}

	return 0;
}

static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
		unsigned char *data, unsigned char len, unsigned char cmd)
{
	struct i2c_client *client = tsc->client;
	int ret;
	struct i2c_msg msg[2] = {
		/* first write slave position to i2c devices */
		{
			.addr = client->addr,
			.len = 1,
			.buf = &cmd
		},
		/* Second read data from position */
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = len,
			.buf = data
		}
	};

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

	return 0;
}

static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
{
	struct input_dev *input = tsc->input;
	unsigned char reg_p[CY8CTMG110_REG_MAX];

	memset(reg_p, 0, CY8CTMG110_REG_MAX);

	/* Reading coordinates */
	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
		return -EIO;

	/* Number of touch */
	if (reg_p[8] == 0) {
		input_report_key(input, BTN_TOUCH, 0);
	} else  {
		input_report_key(input, BTN_TOUCH, 1);
		input_report_abs(input, ABS_X,
				 be16_to_cpup((__be16 *)(reg_p + 0)));
		input_report_abs(input, ABS_Y,
				 be16_to_cpup((__be16 *)(reg_p + 2)));
	}

	input_sync(input);

	return 0;
}

static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
{
	unsigned char reg_p[3];

	if (sleep) {
		reg_p[0] = 0x00;
		reg_p[1] = 0xff;
		reg_p[2] = 5;
	} else {
		reg_p[0] = 0x10;
		reg_p[1] = 0xff;
		reg_p[2] = 0;
	}

	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
}

static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
{
	struct cy8ctmg110 *tsc = dev_id;

	cy8ctmg110_touch_pos(tsc);

	return IRQ_HANDLED;
}

static void cy8ctmg110_shut_off(void *_ts)
{
	struct cy8ctmg110 *ts = _ts;

	cy8ctmg110_set_sleepmode(ts, true);
	cy8ctmg110_power(ts, false);
}

static int cy8ctmg110_probe(struct i2c_client *client)
{
	struct cy8ctmg110 *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(*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 = input_dev;

	snprintf(ts->phys, sizeof(ts->phys),
		 "%s/input0", dev_name(&client->dev));

	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_I2C;

	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
	input_set_abs_params(input_dev, ABS_X,
			CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
	input_set_abs_params(input_dev, ABS_Y,
			CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);

	/* Request and assert reset line */
	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
						 GPIOD_OUT_HIGH);
	if (IS_ERR(ts->reset_gpio)) {
		err = PTR_ERR(ts->reset_gpio);
		dev_err(&client->dev,
			"Unable to request reset GPIO: %d\n", err);
		return err;
	}

	cy8ctmg110_power(ts, true);
	cy8ctmg110_set_sleepmode(ts, false);

	err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts);
	if (err)
		return err;

	err = devm_request_threaded_irq(&client->dev, client->irq,
					NULL, cy8ctmg110_irq_thread,
					IRQF_ONESHOT, "touch_reset_key", ts);
	if (err) {
		dev_err(&client->dev,
			"irq %d busy? error %d\n", client->irq, err);
		return err;
	}

	err = input_register_device(input_dev);
	if (err)
		return err;

	i2c_set_clientdata(client, ts);

	return 0;
}

static int cy8ctmg110_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (!device_may_wakeup(&client->dev)) {
		cy8ctmg110_set_sleepmode(ts, true);
		cy8ctmg110_power(ts, false);
	}

	return 0;
}

static int cy8ctmg110_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct cy8ctmg110 *ts = i2c_get_clientdata(client);

	if (!device_may_wakeup(&client->dev)) {
		cy8ctmg110_power(ts, true);
		cy8ctmg110_set_sleepmode(ts, false);
	}

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(cy8ctmg110_pm,
				cy8ctmg110_suspend, cy8ctmg110_resume);

static const struct i2c_device_id cy8ctmg110_idtable[] = {
	{ CY8CTMG110_DRIVER_NAME, 1 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);

static struct i2c_driver cy8ctmg110_driver = {
	.driver		= {
		.name	= CY8CTMG110_DRIVER_NAME,
		.pm	= pm_sleep_ptr(&cy8ctmg110_pm),
	},
	.id_table	= cy8ctmg110_idtable,
	.probe		= cy8ctmg110_probe,
};

module_i2c_driver(cy8ctmg110_driver);

MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
82c29810	1	// SPDX-License-Identifier: GPL-2.0-only
60347c19 SK	2	/*
	3	* Driver for cypress touch screen controller
	4	*
	5	* Copyright (c) 2009 Aava Mobile
	6	*
	7	* Some cleanups by Alan Cox <alan@linux.intel.com>
60347c19 SK	8	*/
60347c19 SK	9
83b41248	10	#include <linux/i2c.h>
60347c19	11	#include <linux/input.h>
60347c19	12	#include <linux/interrupt.h>
83b41248 DT	13	#include <linux/gpio/consumer.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/slab.h>
1c68b7cf	17	#include <asm/byteorder.h>
60347c19 SK	18
	19	#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
	20
	21	/* Touch coordinates */
	22	#define CY8CTMG110_X_MIN 0
	23	#define CY8CTMG110_Y_MIN 0
	24	#define CY8CTMG110_X_MAX 759
	25	#define CY8CTMG110_Y_MAX 465
	26
	27
	28	/* cy8ctmg110 register definitions */
	29	#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
	30	#define CY8CTMG110_TOUCH_SLEEP_TIME 2
	31	#define CY8CTMG110_TOUCH_X1 3
	32	#define CY8CTMG110_TOUCH_Y1 5
	33	#define CY8CTMG110_TOUCH_X2 7
	34	#define CY8CTMG110_TOUCH_Y2 9
	35	#define CY8CTMG110_FINGERS 11
	36	#define CY8CTMG110_GESTURE 12
	37	#define CY8CTMG110_REG_MAX 13
	38
	39
	40	/*
	41	* The touch driver structure.
	42	*/
	43	struct cy8ctmg110 {
	44	struct input_dev *input;
	45	char phys[32];
	46	struct i2c_client *client;
83b41248	47	struct gpio_desc *reset_gpio;
60347c19 SK	48	};
	49
	50	/*
	51	* cy8ctmg110_power is the routine that is called when touch hardware
83b41248 DT	52	* is being powered off or on. When powering on this routine de-asserts
83b41248 DT	53	* the RESET line, when powering off reset line is asserted.
60347c19 SK	54	*/
	55	static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
	56	{
83b41248 DT	57	if (ts->reset_gpio)
83b41248 DT	58	gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
60347c19 SK	59	}
	60
	61	static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
	62	unsigned char len, unsigned char *value)
	63	{
	64	struct i2c_client *client = tsc->client;
f1b50760	65	int ret;
60347c19 SK	66	unsigned char i2c_data[6];
	67
	68	BUG_ON(len > 5);
	69
	70	i2c_data[0] = reg;
	71	memcpy(i2c_data + 1, value, len);
	72
	73	ret = i2c_master_send(client, i2c_data, len + 1);
21184c4e	74	if (ret != len + 1) {
60347c19	75	dev_err(&client->dev, "i2c write data cmd failed\n");
21184c4e	76	return ret < 0 ? ret : -EIO;
60347c19 SK	77	}
	78
	79	return 0;
	80	}
	81
	82	static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
	83	unsigned char *data, unsigned char len, unsigned char cmd)
	84	{
	85	struct i2c_client *client = tsc->client;
f1b50760	86	int ret;
60347c19 SK	87	struct i2c_msg msg[2] = {
60347c19 SK	88	/* first write slave position to i2c devices */
9493d974 SD	89	{
	90	.addr = client->addr,
	91	.len = 1,
	92	.buf = &cmd
	93	},
60347c19	94	/* Second read data from position */
9493d974 SD	95	{
	96	.addr = client->addr,
	97	.flags = I2C_M_RD,
	98	.len = len,
	99	.buf = data
	100	}
60347c19 SK	101	};
	102
	103	ret = i2c_transfer(client->adapter, msg, 2);
	104	if (ret < 0)
	105	return ret;
	106
	107	return 0;
	108	}
	109
	110	static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
	111	{
	112	struct input_dev *input = tsc->input;
	113	unsigned char reg_p[CY8CTMG110_REG_MAX];
60347c19 SK	114
	115	memset(reg_p, 0, CY8CTMG110_REG_MAX);
	116
	117	/* Reading coordinates */
	118	if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
	119	return -EIO;
	120
60347c19 SK	121	/* Number of touch */
	122	if (reg_p[8] == 0) {
	123	input_report_key(input, BTN_TOUCH, 0);
	124	} else {
	125	input_report_key(input, BTN_TOUCH, 1);
1c68b7cf DT	126	input_report_abs(input, ABS_X,
	127	be16_to_cpup((__be16 *)(reg_p + 0)));
	128	input_report_abs(input, ABS_Y,
	129	be16_to_cpup((__be16 *)(reg_p + 2)));
60347c19 SK	130	}
	131
	132	input_sync(input);
	133
	134	return 0;
	135	}
	136
	137	static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
	138	{
	139	unsigned char reg_p[3];
	140
	141	if (sleep) {
	142	reg_p[0] = 0x00;
	143	reg_p[1] = 0xff;
	144	reg_p[2] = 5;
	145	} else {
	146	reg_p[0] = 0x10;
	147	reg_p[1] = 0xff;
	148	reg_p[2] = 0;
	149	}
	150
	151	return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
	152	}
	153
	154	static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
	155	{
	156	struct cy8ctmg110 *tsc = dev_id;
	157
	158	cy8ctmg110_touch_pos(tsc);
	159
	160	return IRQ_HANDLED;
	161	}
	162
4e5220cb DT	163	static void cy8ctmg110_shut_off(void *_ts)
	164	{
	165	struct cy8ctmg110 *ts = _ts;
	166
	167	cy8ctmg110_set_sleepmode(ts, true);
	168	cy8ctmg110_power(ts, false);
	169	}
	170
520bc8fb	171	static int cy8ctmg110_probe(struct i2c_client *client)
60347c19	172	{
60347c19 SK	173	struct cy8ctmg110 *ts;
	174	struct input_dev *input_dev;
	175	int err;
	176
60347c19 SK	177	if (!i2c_check_functionality(client->adapter,
	178	I2C_FUNC_SMBUS_READ_WORD_DATA))
	179	return -EIO;
	180
4e5220cb DT	181	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
	182	if (!ts)
	183	return -ENOMEM;
	184
	185	input_dev = devm_input_allocate_device(&client->dev);
	186	if (!input_dev)
	187	return -ENOMEM;
60347c19 SK	188
	189	ts->client = client;
	190	ts->input = input_dev;
	191
	192	snprintf(ts->phys, sizeof(ts->phys),
	193	"%s/input0", dev_name(&client->dev));
	194
	195	input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
	196	input_dev->phys = ts->phys;
	197	input_dev->id.bustype = BUS_I2C;
60347c19	198
4e5220cb	199	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
60347c19	200	input_set_abs_params(input_dev, ABS_X,
a4e6aad6	201	CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
60347c19	202	input_set_abs_params(input_dev, ABS_Y,
a4e6aad6	203	CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
60347c19	204
83b41248 DT	205	/* Request and assert reset line */
	206	ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
	207	GPIOD_OUT_HIGH);
	208	if (IS_ERR(ts->reset_gpio)) {
	209	err = PTR_ERR(ts->reset_gpio);
	210	dev_err(&client->dev,
	211	"Unable to request reset GPIO: %d\n", err);
	212	return err;
60347c19 SK	213	}
	214
	215	cy8ctmg110_power(ts, true);
	216	cy8ctmg110_set_sleepmode(ts, false);
	217
4e5220cb DT	218	err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts);
	219	if (err)
	220	return err;
	221
	222	err = devm_request_threaded_irq(&client->dev, client->irq,
	223	NULL, cy8ctmg110_irq_thread,
	224	IRQF_ONESHOT, "touch_reset_key", ts);
	225	if (err) {
60347c19 SK	226	dev_err(&client->dev,
60347c19 SK	227	"irq %d busy? error %d\n", client->irq, err);
4e5220cb	228	return err;
60347c19 SK	229	}
	230
	231	err = input_register_device(input_dev);
	232	if (err)
4e5220cb	233	return err;
60347c19 SK	234
60347c19 SK	235	i2c_set_clientdata(client, ts);
2a15cebb	236
60347c19	237	return 0;
60347c19 SK	238	}
60347c19 SK	239
c5aa5183	240	static int cy8ctmg110_suspend(struct device *dev)
60347c19	241	{
93f38e91	242	struct i2c_client *client = to_i2c_client(dev);
60347c19 SK	243	struct cy8ctmg110 *ts = i2c_get_clientdata(client);
60347c19 SK	244
172b07a6	245	if (!device_may_wakeup(&client->dev)) {
60347c19 SK	246	cy8ctmg110_set_sleepmode(ts, true);
	247	cy8ctmg110_power(ts, false);
	248	}
172b07a6	249
60347c19 SK	250	return 0;
	251	}
	252
c5aa5183	253	static int cy8ctmg110_resume(struct device *dev)
60347c19	254	{
93f38e91	255	struct i2c_client *client = to_i2c_client(dev);
60347c19 SK	256	struct cy8ctmg110 *ts = i2c_get_clientdata(client);
60347c19 SK	257
172b07a6	258	if (!device_may_wakeup(&client->dev)) {
60347c19 SK	259	cy8ctmg110_power(ts, true);
	260	cy8ctmg110_set_sleepmode(ts, false);
	261	}
172b07a6	262
60347c19 SK	263	return 0;
60347c19 SK	264	}
93f38e91	265
c5aa5183 JC	266	static DEFINE_SIMPLE_DEV_PM_OPS(cy8ctmg110_pm,
c5aa5183 JC	267	cy8ctmg110_suspend, cy8ctmg110_resume);
60347c19	268
d448303a	269	static const struct i2c_device_id cy8ctmg110_idtable[] = {
60347c19 SK	270	{ CY8CTMG110_DRIVER_NAME, 1 },
	271	{ }
	272	};
	273
	274	MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
	275
	276	static struct i2c_driver cy8ctmg110_driver = {
	277	.driver = {
60347c19	278	.name = CY8CTMG110_DRIVER_NAME,
c5aa5183	279	.pm = pm_sleep_ptr(&cy8ctmg110_pm),
60347c19 SK	280	},
60347c19 SK	281	.id_table = cy8ctmg110_idtable,
d8bde56d	282	.probe = cy8ctmg110_probe,
60347c19 SK	283	};
60347c19 SK	284
1b92c1cf	285	module_i2c_driver(cy8ctmg110_driver);
60347c19 SK	286
	287	MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
	288	MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
	289	MODULE_LICENSE("GPL v2");