[mirror_ubuntu-hirsute-kernel.git] / drivers / input / touchscreen / ili210x.c

// SPDX-License-Identifier: GPL-2.0-only
#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_device.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#define ILI210X_TOUCHES		2
#define ILI211X_TOUCHES		10
#define ILI251X_TOUCHES		10

#define ILI2XXX_POLL_PERIOD	20

/* Touchscreen commands */
#define REG_TOUCHDATA		0x10
#define REG_PANEL_INFO		0x20
#define REG_FIRMWARE_VERSION	0x40
#define REG_CALIBRATE		0xcc

struct firmware_version {
	u8 id;
	u8 major;
	u8 minor;
} __packed;

enum ili2xxx_model {
	MODEL_ILI210X,
	MODEL_ILI211X,
	MODEL_ILI251X,
};

struct ili210x {
	struct i2c_client *client;
	struct input_dev *input;
	struct gpio_desc *reset_gpio;
	struct touchscreen_properties prop;
	enum ili2xxx_model model;
	unsigned int max_touches;
	bool stop;
};

static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
			    size_t len)
{
	struct ili210x *priv = i2c_get_clientdata(client);
	struct i2c_msg msg[2] = {
		{
			.addr	= client->addr,
			.flags	= 0,
			.len	= 1,
			.buf	= &reg,
		},
		{
			.addr	= client->addr,
			.flags	= I2C_M_RD,
			.len	= len,
			.buf	= buf,
		}
	};

	if (priv->model == MODEL_ILI251X) {
		if (i2c_transfer(client->adapter, msg, 1) != 1) {
			dev_err(&client->dev, "i2c transfer failed\n");
			return -EIO;
		}

		usleep_range(5000, 5500);

		if (i2c_transfer(client->adapter, msg + 1, 1) != 1) {
			dev_err(&client->dev, "i2c transfer failed\n");
			return -EIO;
		}
	} else {
		if (i2c_transfer(client->adapter, msg, 2) != 2) {
			dev_err(&client->dev, "i2c transfer failed\n");
			return -EIO;
		}
	}

	return 0;
}

static int ili210x_read(struct i2c_client *client, void *buf, size_t len)
{
	struct i2c_msg msg = {
		.addr	= client->addr,
		.flags	= I2C_M_RD,
		.len	= len,
		.buf	= buf,
	};

	if (i2c_transfer(client->adapter, &msg, 1) != 1) {
		dev_err(&client->dev, "i2c transfer failed\n");
		return -EIO;
	}

	return 0;
}

static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
					unsigned int finger,
					unsigned int *x, unsigned int *y)
{
	if (finger >= ILI210X_TOUCHES)
		return false;

	if (touchdata[0] & BIT(finger))
		return false;

	*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
	*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);

	return true;
}

static bool ili211x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
					unsigned int finger,
					unsigned int *x, unsigned int *y)
{
	u32 data;

	if (finger >= ILI211X_TOUCHES)
		return false;

	data = get_unaligned_be32(touchdata + 1 + (finger * 4) + 0);
	if (data == 0xffffffff)	/* Finger up */
		return false;

	*x = ((touchdata[1 + (finger * 4) + 0] & 0xf0) << 4) |
	     touchdata[1 + (finger * 4) + 1];
	*y = ((touchdata[1 + (finger * 4) + 0] & 0x0f) << 8) |
	     touchdata[1 + (finger * 4) + 2];

	return true;
}

static bool ili251x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
					unsigned int finger,
					unsigned int *x, unsigned int *y)
{
	if (finger >= ILI251X_TOUCHES)
		return false;

	*x = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
	if (!(*x & BIT(15)))	/* Touch indication */
		return false;

	*x &= 0x3fff;
	*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);

	return true;
}

static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
{
	struct input_dev *input = priv->input;
	int i;
	bool contact = false, touch = false;
	unsigned int x = 0, y = 0;

	for (i = 0; i < priv->max_touches; i++) {
		if (priv->model == MODEL_ILI210X) {
			touch = ili210x_touchdata_to_coords(priv, touchdata,
							    i, &x, &y);
		} else if (priv->model == MODEL_ILI211X) {
			touch = ili211x_touchdata_to_coords(priv, touchdata,
							    i, &x, &y);
		} else if (priv->model == MODEL_ILI251X) {
			touch = ili251x_touchdata_to_coords(priv, touchdata,
							    i, &x, &y);
			if (touch)
				contact = true;
		}

		input_mt_slot(input, i);
		input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
		if (!touch)
			continue;
		touchscreen_report_pos(input, &priv->prop, x, y,
				       true);
	}

	input_mt_report_pointer_emulation(input, false);
	input_sync(input);

	if (priv->model == MODEL_ILI210X)
		contact = touchdata[0] & 0xf3;

	return contact;
}

static irqreturn_t ili210x_irq(int irq, void *irq_data)
{
	struct ili210x *priv = irq_data;
	struct i2c_client *client = priv->client;
	u8 touchdata[64] = { 0 };
	s16 sum = 0;
	bool touch;
	int i;
	int error;

	do {
		if (priv->model == MODEL_ILI210X) {
			error = ili210x_read_reg(client, REG_TOUCHDATA,
						 touchdata, sizeof(touchdata));
		} else if (priv->model == MODEL_ILI211X) {
			error = ili210x_read(client, touchdata, 43);
			if (!error) {
				/*
				 * This chip uses custom checksum at the end
				 * of data.
				 */
				for (i = 0; i <= 41; i++)
					sum = (sum + touchdata[i]) & 0xff;
				if ((-sum & 0xff) != touchdata[42]) {
					dev_err(&client->dev,
						"CRC error (crc=0x%02x expected=0x%02x)\n",
						sum, touchdata[42]);
					break;
				}
			}
		} else if (priv->model == MODEL_ILI251X) {
			error = ili210x_read_reg(client, REG_TOUCHDATA,
						 touchdata, 31);
			if (!error && touchdata[0] == 2)
				error = ili210x_read(client,
						     &touchdata[31], 20);
		}

		if (error) {
			dev_err(&client->dev,
				"Unable to get touchdata, err = %d\n", error);
			break;
		}

		touch = ili210x_report_events(priv, touchdata);
		if (touch)
			msleep(ILI2XXX_POLL_PERIOD);
	} while (!priv->stop && touch);

	return IRQ_HANDLED;
}

static ssize_t ili210x_calibrate(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ili210x *priv = i2c_get_clientdata(client);
	unsigned long calibrate;
	int rc;
	u8 cmd = REG_CALIBRATE;

	if (kstrtoul(buf, 10, &calibrate))
		return -EINVAL;

	if (calibrate > 1)
		return -EINVAL;

	if (calibrate) {
		rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
		if (rc != sizeof(cmd))
			return -EIO;
	}

	return count;
}
static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);

static struct attribute *ili210x_attributes[] = {
	&dev_attr_calibrate.attr,
	NULL,
};

static const struct attribute_group ili210x_attr_group = {
	.attrs = ili210x_attributes,
};

static void ili210x_power_down(void *data)
{
	struct gpio_desc *reset_gpio = data;

	gpiod_set_value_cansleep(reset_gpio, 1);
}

static void ili210x_stop(void *data)
{
	struct ili210x *priv = data;

	/* Tell ISR to quit even if there is a contact. */
	priv->stop = true;
}

static int ili210x_i2c_probe(struct i2c_client *client,
				       const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct ili210x *priv;
	struct gpio_desc *reset_gpio;
	struct input_dev *input;
	struct firmware_version firmware;
	enum ili2xxx_model model;
	int error;

	model = (enum ili2xxx_model)id->driver_data;

	dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");

	if (client->irq <= 0) {
		dev_err(dev, "No IRQ!\n");
		return -EINVAL;
	}

	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(reset_gpio))
		return PTR_ERR(reset_gpio);

	if (reset_gpio) {
		error = devm_add_action_or_reset(dev, ili210x_power_down,
						 reset_gpio);
		if (error)
			return error;

		usleep_range(50, 100);
		gpiod_set_value_cansleep(reset_gpio, 0);
		msleep(100);
	}

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	input = devm_input_allocate_device(dev);
	if (!input)
		return -ENOMEM;

	priv->client = client;
	priv->input = input;
	priv->reset_gpio = reset_gpio;
	priv->model = model;
	if (model == MODEL_ILI210X)
		priv->max_touches = ILI210X_TOUCHES;
	if (model == MODEL_ILI211X)
		priv->max_touches = ILI211X_TOUCHES;
	if (model == MODEL_ILI251X)
		priv->max_touches = ILI251X_TOUCHES;

	i2c_set_clientdata(client, priv);

	/* Get firmware version */
	error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
				 &firmware, sizeof(firmware));
	if (error) {
		dev_err(dev, "Failed to get firmware version, err: %d\n",
			error);
		return error;
	}

	/* Setup input device */
	input->name = "ILI210x Touchscreen";
	input->id.bustype = BUS_I2C;

	/* Multi touch */
	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 0xffff, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 0xffff, 0, 0);
	touchscreen_parse_properties(input, true, &priv->prop);

	error = input_mt_init_slots(input, priv->max_touches, INPUT_MT_DIRECT);
	if (error) {
		dev_err(dev, "Unable to set up slots, err: %d\n", error);
		return error;
	}

	error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq,
					  IRQF_ONESHOT, client->name, priv);
	if (error) {
		dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
			error);
		return error;
	}

	error = devm_add_action_or_reset(dev, ili210x_stop, priv);
	if (error)
		return error;

	error = devm_device_add_group(dev, &ili210x_attr_group);
	if (error) {
		dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
			error);
		return error;
	}

	error = input_register_device(priv->input);
	if (error) {
		dev_err(dev, "Cannot register input device, err: %d\n", error);
		return error;
	}

	device_init_wakeup(dev, 1);

	dev_dbg(dev,
		"ILI210x initialized (IRQ: %d), firmware version %d.%d.%d",
		client->irq, firmware.id, firmware.major, firmware.minor);

	return 0;
}

static int __maybe_unused ili210x_i2c_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

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

	return 0;
}

static int __maybe_unused ili210x_i2c_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

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

	return 0;
}

static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
			 ili210x_i2c_suspend, ili210x_i2c_resume);

static const struct i2c_device_id ili210x_i2c_id[] = {
	{ "ili210x", MODEL_ILI210X },
	{ "ili2117", MODEL_ILI211X },
	{ "ili251x", MODEL_ILI251X },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);

static const struct of_device_id ili210x_dt_ids[] = {
	{ .compatible = "ilitek,ili210x", .data = (void *)MODEL_ILI210X },
	{ .compatible = "ilitek,ili2117", .data = (void *)MODEL_ILI211X },
	{ .compatible = "ilitek,ili251x", .data = (void *)MODEL_ILI251X },
	{ },
};
MODULE_DEVICE_TABLE(of, ili210x_dt_ids);

static struct i2c_driver ili210x_ts_driver = {
	.driver = {
		.name = "ili210x_i2c",
		.pm = &ili210x_i2c_pm,
		.of_match_table = ili210x_dt_ids,
	},
	.id_table = ili210x_i2c_id,
	.probe = ili210x_i2c_probe,
};

module_i2c_driver(ili210x_ts_driver);

MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
71f8e38a DT	2	#include <linux/delay.h>
71f8e38a DT	3	#include <linux/gpio/consumer.h>
5c6a7a62	4	#include <linux/i2c.h>
5c6a7a62 OS	5	#include <linux/input.h>
5c6a7a62 OS	6	#include <linux/input/mt.h>
f67cc3e9	7	#include <linux/input/touchscreen.h>
71f8e38a DT	8	#include <linux/interrupt.h>
71f8e38a DT	9	#include <linux/module.h>
49588917	10	#include <linux/of_device.h>
71f8e38a	11	#include <linux/slab.h>
e3559442	12	#include <asm/unaligned.h>
5c6a7a62	13
49588917	14	#define ILI210X_TOUCHES 2
eb91ecc9	15	#define ILI211X_TOUCHES 10
49588917	16	#define ILI251X_TOUCHES 10
71f8e38a DT	17
71f8e38a DT	18	#define ILI2XXX_POLL_PERIOD 20
5c6a7a62 OS	19
	20	/* Touchscreen commands */
	21	#define REG_TOUCHDATA 0x10
	22	#define REG_PANEL_INFO 0x20
	23	#define REG_FIRMWARE_VERSION 0x40
	24	#define REG_CALIBRATE 0xcc
	25
5c6a7a62 OS	26	struct firmware_version {
	27	u8 id;
	28	u8 major;
	29	u8 minor;
	30	} __packed;
	31
49588917 MV	32	enum ili2xxx_model {
49588917 MV	33	MODEL_ILI210X,
eb91ecc9	34	MODEL_ILI211X,
49588917 MV	35	MODEL_ILI251X,
	36	};
	37
5c6a7a62 OS	38	struct ili210x {
	39	struct i2c_client *client;
	40	struct input_dev *input;
201f3c80	41	struct gpio_desc *reset_gpio;
f67cc3e9	42	struct touchscreen_properties prop;
49588917 MV	43	enum ili2xxx_model model;
49588917 MV	44	unsigned int max_touches;
71f8e38a	45	bool stop;
5c6a7a62 OS	46	};
	47
	48	static int ili210x_read_reg(struct i2c_client client, u8 reg, void buf,
	49	size_t len)
	50	{
49588917	51	struct ili210x *priv = i2c_get_clientdata(client);
5c6a7a62 OS	52	struct i2c_msg msg[2] = {
	53	{
	54	.addr = client->addr,
	55	.flags = 0,
	56	.len = 1,
	57	.buf = &reg,
	58	},
	59	{
	60	.addr = client->addr,
	61	.flags = I2C_M_RD,
	62	.len = len,
	63	.buf = buf,
	64	}
	65	};
	66
49588917 MV	67	if (priv->model == MODEL_ILI251X) {
	68	if (i2c_transfer(client->adapter, msg, 1) != 1) {
	69	dev_err(&client->dev, "i2c transfer failed\n");
	70	return -EIO;
	71	}
	72
	73	usleep_range(5000, 5500);
	74
	75	if (i2c_transfer(client->adapter, msg + 1, 1) != 1) {
	76	dev_err(&client->dev, "i2c transfer failed\n");
	77	return -EIO;
	78	}
	79	} else {
	80	if (i2c_transfer(client->adapter, msg, 2) != 2) {
	81	dev_err(&client->dev, "i2c transfer failed\n");
	82	return -EIO;
	83	}
	84	}
	85
	86	return 0;
	87	}
	88
	89	static int ili210x_read(struct i2c_client client, void buf, size_t len)
	90	{
	91	struct i2c_msg msg = {
	92	.addr = client->addr,
	93	.flags = I2C_M_RD,
	94	.len = len,
	95	.buf = buf,
	96	};
	97
	98	if (i2c_transfer(client->adapter, &msg, 1) != 1) {
5c6a7a62 OS	99	dev_err(&client->dev, "i2c transfer failed\n");
	100	return -EIO;
	101	}
	102
	103	return 0;
	104	}
	105
e3559442 MV	106	static bool ili210x_touchdata_to_coords(struct ili210x priv, u8 touchdata,
	107	unsigned int finger,
	108	unsigned int x, unsigned int y)
	109	{
49588917	110	if (finger >= ILI210X_TOUCHES)
e3559442 MV	111	return false;
	112
	113	if (touchdata[0] & BIT(finger))
	114	return false;
	115
	116	x = get_unaligned_be16(touchdata + 1 + (finger 4) + 0);
	117	y = get_unaligned_be16(touchdata + 1 + (finger 4) + 2);
	118
	119	return true;
	120	}
	121
eb91ecc9 MV	122	static bool ili211x_touchdata_to_coords(struct ili210x priv, u8 touchdata,
	123	unsigned int finger,
	124	unsigned int x, unsigned int y)
	125	{
	126	u32 data;
	127
	128	if (finger >= ILI211X_TOUCHES)
	129	return false;
	130
	131	data = get_unaligned_be32(touchdata + 1 + (finger * 4) + 0);
	132	if (data == 0xffffffff) /* Finger up */
	133	return false;
	134
	135	x = ((touchdata[1 + (finger 4) + 0] & 0xf0) << 4) \|
	136	touchdata[1 + (finger * 4) + 1];
	137	y = ((touchdata[1 + (finger 4) + 0] & 0x0f) << 8) \|
	138	touchdata[1 + (finger * 4) + 2];
	139
	140	return true;
	141	}
	142
49588917 MV	143	static bool ili251x_touchdata_to_coords(struct ili210x priv, u8 touchdata,
	144	unsigned int finger,
	145	unsigned int x, unsigned int y)
	146	{
	147	if (finger >= ILI251X_TOUCHES)
	148	return false;
	149
	150	x = get_unaligned_be16(touchdata + 1 + (finger 5) + 0);
	151	if (!(x & BIT(15))) / Touch indication */
	152	return false;
	153
	154	*x &= 0x3fff;
	155	y = get_unaligned_be16(touchdata + 1 + (finger 5) + 2);
	156
	157	return true;
	158	}
	159
e3559442	160	static bool ili210x_report_events(struct ili210x priv, u8 touchdata)
5c6a7a62	161	{
e3559442	162	struct input_dev *input = priv->input;
5c6a7a62	163	int i;
49588917 MV	164	bool contact = false, touch = false;
49588917 MV	165	unsigned int x = 0, y = 0;
5c6a7a62	166
49588917	167	for (i = 0; i < priv->max_touches; i++) {
49588917 MV	168	if (priv->model == MODEL_ILI210X) {
	169	touch = ili210x_touchdata_to_coords(priv, touchdata,
	170	i, &x, &y);
eb91ecc9 MV	171	} else if (priv->model == MODEL_ILI211X) {
	172	touch = ili211x_touchdata_to_coords(priv, touchdata,
	173	i, &x, &y);
49588917 MV	174	} else if (priv->model == MODEL_ILI251X) {
	175	touch = ili251x_touchdata_to_coords(priv, touchdata,
	176	i, &x, &y);
	177	if (touch)
	178	contact = true;
	179	}
	180
f67cc3e9	181	input_mt_slot(input, i);
5c6a7a62	182	input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
f67cc3e9 MV	183	if (!touch)
	184	continue;
	185	touchscreen_report_pos(input, &priv->prop, x, y,
	186	true);
5c6a7a62 OS	187	}
	188
	189	input_mt_report_pointer_emulation(input, false);
	190	input_sync(input);
e3559442	191
49588917 MV	192	if (priv->model == MODEL_ILI210X)
	193	contact = touchdata[0] & 0xf3;
	194
	195	return contact;
5c6a7a62 OS	196	}
5c6a7a62 OS	197
71f8e38a	198	static irqreturn_t ili210x_irq(int irq, void *irq_data)
5c6a7a62	199	{
71f8e38a	200	struct ili210x *priv = irq_data;
5c6a7a62	201	struct i2c_client *client = priv->client;
49588917	202	u8 touchdata[64] = { 0 };
eb91ecc9	203	s16 sum = 0;
e3559442	204	bool touch;
71f8e38a DT	205	int i;
	206	int error;
	207
	208	do {
	209	if (priv->model == MODEL_ILI210X) {
	210	error = ili210x_read_reg(client, REG_TOUCHDATA,
	211	touchdata, sizeof(touchdata));
	212	} else if (priv->model == MODEL_ILI211X) {
	213	error = ili210x_read(client, touchdata, 43);
	214	if (!error) {
	215	/*
	216	* This chip uses custom checksum at the end
	217	* of data.
	218	*/
	219	for (i = 0; i <= 41; i++)
	220	sum = (sum + touchdata[i]) & 0xff;
	221	if ((-sum & 0xff) != touchdata[42]) {
	222	dev_err(&client->dev,
	223	"CRC error (crc=0x%02x expected=0x%02x)\n",
	224	sum, touchdata[42]);
	225	break;
	226	}
eb91ecc9	227	}
71f8e38a DT	228	} else if (priv->model == MODEL_ILI251X) {
	229	error = ili210x_read_reg(client, REG_TOUCHDATA,
	230	touchdata, 31);
	231	if (!error && touchdata[0] == 2)
	232	error = ili210x_read(client,
	233	&touchdata[31], 20);
eb91ecc9	234	}
5c6a7a62	235
71f8e38a DT	236	if (error) {
	237	dev_err(&client->dev,
	238	"Unable to get touchdata, err = %d\n", error);
	239	break;
	240	}
5c6a7a62	241
71f8e38a DT	242	touch = ili210x_report_events(priv, touchdata);
	243	if (touch)
	244	msleep(ILI2XXX_POLL_PERIOD);
	245	} while (!priv->stop && touch);
5c6a7a62 OS	246
	247	return IRQ_HANDLED;
	248	}
	249
	250	static ssize_t ili210x_calibrate(struct device *dev,
	251	struct device_attribute *attr,
	252	const char *buf, size_t count)
	253	{
	254	struct i2c_client *client = to_i2c_client(dev);
	255	struct ili210x *priv = i2c_get_clientdata(client);
	256	unsigned long calibrate;
	257	int rc;
	258	u8 cmd = REG_CALIBRATE;
	259
	260	if (kstrtoul(buf, 10, &calibrate))
	261	return -EINVAL;
	262
	263	if (calibrate > 1)
	264	return -EINVAL;
	265
	266	if (calibrate) {
	267	rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
	268	if (rc != sizeof(cmd))
	269	return -EIO;
	270	}
	271
	272	return count;
	273	}
b27c0d0c	274	static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);
5c6a7a62 OS	275
	276	static struct attribute *ili210x_attributes[] = {
	277	&dev_attr_calibrate.attr,
	278	NULL,
	279	};
	280
	281	static const struct attribute_group ili210x_attr_group = {
	282	.attrs = ili210x_attributes,
	283	};
	284
201f3c80 MV	285	static void ili210x_power_down(void *data)
	286	{
	287	struct gpio_desc *reset_gpio = data;
	288
	289	gpiod_set_value_cansleep(reset_gpio, 1);
	290	}
	291
71f8e38a	292	static void ili210x_stop(void *data)
1bdec5d9 MV	293	{
	294	struct ili210x *priv = data;
	295
71f8e38a DT	296	/* Tell ISR to quit even if there is a contact. */
71f8e38a DT	297	priv->stop = true;
1bdec5d9 MV	298	}
1bdec5d9 MV	299
5298cc4c	300	static int ili210x_i2c_probe(struct i2c_client *client,
5c6a7a62 OS	301	const struct i2c_device_id *id)
	302	{
	303	struct device *dev = &client->dev;
5c6a7a62	304	struct ili210x *priv;
201f3c80	305	struct gpio_desc *reset_gpio;
5c6a7a62	306	struct input_dev *input;
5c6a7a62	307	struct firmware_version firmware;
49588917	308	enum ili2xxx_model model;
5c6a7a62 OS	309	int error;
5c6a7a62 OS	310
49588917 MV	311	model = (enum ili2xxx_model)id->driver_data;
49588917 MV	312
5c6a7a62 OS	313	dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
5c6a7a62 OS	314
5c6a7a62 OS	315	if (client->irq <= 0) {
	316	dev_err(dev, "No IRQ!\n");
	317	return -EINVAL;
	318	}
	319
201f3c80 MV	320	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
	321	if (IS_ERR(reset_gpio))
	322	return PTR_ERR(reset_gpio);
	323
	324	if (reset_gpio) {
	325	error = devm_add_action_or_reset(dev, ili210x_power_down,
	326	reset_gpio);
	327	if (error)
	328	return error;
	329
	330	usleep_range(50, 100);
	331	gpiod_set_value_cansleep(reset_gpio, 0);
	332	msleep(100);
	333	}
	334
12294577 MV	335	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	336	if (!priv)
	337	return -ENOMEM;
	338
	339	input = devm_input_allocate_device(dev);
	340	if (!input)
	341	return -ENOMEM;
	342
	343	priv->client = client;
	344	priv->input = input;
12294577	345	priv->reset_gpio = reset_gpio;
49588917 MV	346	priv->model = model;
	347	if (model == MODEL_ILI210X)
	348	priv->max_touches = ILI210X_TOUCHES;
eb91ecc9 MV	349	if (model == MODEL_ILI211X)
eb91ecc9 MV	350	priv->max_touches = ILI211X_TOUCHES;
49588917 MV	351	if (model == MODEL_ILI251X)
49588917 MV	352	priv->max_touches = ILI251X_TOUCHES;
12294577 MV	353
	354	i2c_set_clientdata(client, priv);
	355
5c6a7a62 OS	356	/* Get firmware version */
	357	error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
	358	&firmware, sizeof(firmware));
	359	if (error) {
	360	dev_err(dev, "Failed to get firmware version, err: %d\n",
	361	error);
	362	return error;
	363	}
	364
5c6a7a62 OS	365	/* Setup input device */
	366	input->name = "ILI210x Touchscreen";
	367	input->id.bustype = BUS_I2C;
5c6a7a62	368
5c6a7a62	369	/* Multi touch */
f67cc3e9 MV	370	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 0xffff, 0, 0);
	371	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 0xffff, 0, 0);
	372	touchscreen_parse_properties(input, true, &priv->prop);
43f06a4c DT	373
	374	error = input_mt_init_slots(input, priv->max_touches, INPUT_MT_DIRECT);
	375	if (error) {
	376	dev_err(dev, "Unable to set up slots, err: %d\n", error);
	377	return error;
	378	}
5c6a7a62	379
71f8e38a DT	380	error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq,
71f8e38a DT	381	IRQF_ONESHOT, client->name, priv);
5c6a7a62 OS	382	if (error) {
	383	dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
	384	error);
1bdec5d9	385	return error;
5c6a7a62 OS	386	}
5c6a7a62 OS	387
71f8e38a DT	388	error = devm_add_action_or_reset(dev, ili210x_stop, priv);
	389	if (error)
	390	return error;
	391
576057bf	392	error = devm_device_add_group(dev, &ili210x_attr_group);
5c6a7a62 OS	393	if (error) {
	394	dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
	395	error);
1bdec5d9	396	return error;
5c6a7a62 OS	397	}
	398
	399	error = input_register_device(priv->input);
	400	if (error) {
971bd8fa	401	dev_err(dev, "Cannot register input device, err: %d\n", error);
576057bf	402	return error;
5c6a7a62 OS	403	}
5c6a7a62 OS	404
d7ddf154	405	device_init_wakeup(dev, 1);
5c6a7a62 OS	406
	407	dev_dbg(dev,
	408	"ILI210x initialized (IRQ: %d), firmware version %d.%d.%d",
	409	client->irq, firmware.id, firmware.major, firmware.minor);
	410
	411	return 0;
5c6a7a62 OS	412	}
5c6a7a62 OS	413
02b6a58b	414	static int __maybe_unused ili210x_i2c_suspend(struct device *dev)
5c6a7a62 OS	415	{
	416	struct i2c_client *client = to_i2c_client(dev);
	417
	418	if (device_may_wakeup(&client->dev))
	419	enable_irq_wake(client->irq);
	420
	421	return 0;
	422	}
	423
02b6a58b	424	static int __maybe_unused ili210x_i2c_resume(struct device *dev)
5c6a7a62 OS	425	{
	426	struct i2c_client *client = to_i2c_client(dev);
	427
	428	if (device_may_wakeup(&client->dev))
	429	disable_irq_wake(client->irq);
	430
	431	return 0;
	432	}
5c6a7a62 OS	433
	434	static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
	435	ili210x_i2c_suspend, ili210x_i2c_resume);
	436
	437	static const struct i2c_device_id ili210x_i2c_id[] = {
49588917	438	{ "ili210x", MODEL_ILI210X },
eb91ecc9	439	{ "ili2117", MODEL_ILI211X },
49588917	440	{ "ili251x", MODEL_ILI251X },
5c6a7a62 OS	441	{ }
	442	};
	443	MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
	444
c5d0e4b5	445	static const struct of_device_id ili210x_dt_ids[] = {
49588917	446	{ .compatible = "ilitek,ili210x", .data = (void *)MODEL_ILI210X },
eb91ecc9	447	{ .compatible = "ilitek,ili2117", .data = (void *)MODEL_ILI211X },
49588917	448	{ .compatible = "ilitek,ili251x", .data = (void *)MODEL_ILI251X },
c5d0e4b5 MV	449	{ },
	450	};
	451	MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
	452
5c6a7a62 OS	453	static struct i2c_driver ili210x_ts_driver = {
	454	.driver = {
	455	.name = "ili210x_i2c",
5c6a7a62	456	.pm = &ili210x_i2c_pm,
c5d0e4b5	457	.of_match_table = ili210x_dt_ids,
5c6a7a62 OS	458	},
	459	.id_table = ili210x_i2c_id,
	460	.probe = ili210x_i2c_probe,
5c6a7a62 OS	461	};
	462
	463	module_i2c_driver(ili210x_ts_driver);
	464
	465	MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
	466	MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
	467	MODULE_LICENSE("GPL");