drivers/input/touchscreen/silead.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /* -------------------------------------------------------------------------
  * Copyright (C) 2014-2015, Intel Corporation
  *
  * Derived from:
  *  gslX68X.c
  *  Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
  *
  * -------------------------------------------------------------------------
  */

 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/acpi.h>
 #include <linux/interrupt.h>
 #include <linux/gpio/consumer.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/input.h>
 #include <linux/input/mt.h>
 #include <linux/input/touchscreen.h>
 #include <linux/pm.h>
 #include <linux/irq.h>
 #include <linux/regulator/consumer.h>

 #include <asm/unaligned.h>

 #define SILEAD_TS_NAME		"silead_ts"

 #define SILEAD_REG_RESET	0xE0
 #define SILEAD_REG_DATA		0x80
 #define SILEAD_REG_TOUCH_NR	0x80
 #define SILEAD_REG_POWER	0xBC
 #define SILEAD_REG_CLOCK	0xE4
 #define SILEAD_REG_STATUS	0xB0
 #define SILEAD_REG_ID		0xFC
 #define SILEAD_REG_MEM_CHECK	0xB0

 #define SILEAD_STATUS_OK	0x5A5A5A5A
 #define SILEAD_TS_DATA_LEN	44
 #define SILEAD_CLOCK		0x04

 #define SILEAD_CMD_RESET	0x88
 #define SILEAD_CMD_START	0x00

 #define SILEAD_POINT_DATA_LEN	0x04
 #define SILEAD_POINT_Y_OFF      0x00
 #define SILEAD_POINT_Y_MSB_OFF	0x01
 #define SILEAD_POINT_X_OFF	0x02
 #define SILEAD_POINT_X_MSB_OFF	0x03
 #define SILEAD_EXTRA_DATA_MASK	0xF0

 #define SILEAD_CMD_SLEEP_MIN	10000
 #define SILEAD_CMD_SLEEP_MAX	20000
 #define SILEAD_POWER_SLEEP	20
 #define SILEAD_STARTUP_SLEEP	30

 #define SILEAD_MAX_FINGERS	10

 enum silead_ts_power {
 	SILEAD_POWER_ON  = 1,
 	SILEAD_POWER_OFF = 0
 };

 struct silead_ts_data {
 	struct i2c_client *client;
 	struct gpio_desc *gpio_power;
 	struct input_dev *input;
 	struct regulator_bulk_data regulators[2];
 	char fw_name[64];
 	struct touchscreen_properties prop;
 	u32 max_fingers;
 	u32 chip_id;
 	struct input_mt_pos pos[SILEAD_MAX_FINGERS];
 	int slots[SILEAD_MAX_FINGERS];
 	int id[SILEAD_MAX_FINGERS];
 };

 struct silead_fw_data {
 	u32 offset;
 	u32 val;
 };

 static int silead_ts_request_input_dev(struct silead_ts_data *data)
 {
 	struct device *dev = &data->client->dev;
 	int error;

 	data->input = devm_input_allocate_device(dev);
 	if (!data->input) {
 		dev_err(dev,
 			"Failed to allocate input device\n");
 		return -ENOMEM;
 	}

 	input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
 	input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
 	touchscreen_parse_properties(data->input, true, &data->prop);

 	input_mt_init_slots(data->input, data->max_fingers,
 			    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
 			    INPUT_MT_TRACK);

 	if (device_property_read_bool(dev, "silead,home-button"))
 		input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);

 	data->input->name = SILEAD_TS_NAME;
 	data->input->phys = "input/ts";
 	data->input->id.bustype = BUS_I2C;

 	error = input_register_device(data->input);
 	if (error) {
 		dev_err(dev, "Failed to register input device: %d\n", error);
 		return error;
 	}

 	return 0;
 }

 static void silead_ts_set_power(struct i2c_client *client,
 				enum silead_ts_power state)
 {
 	struct silead_ts_data *data = i2c_get_clientdata(client);

 	if (data->gpio_power) {
 		gpiod_set_value_cansleep(data->gpio_power, state);
 		msleep(SILEAD_POWER_SLEEP);
 	}
 }

 static void silead_ts_read_data(struct i2c_client *client)
 {
 	struct silead_ts_data *data = i2c_get_clientdata(client);
 	struct input_dev *input = data->input;
 	struct device *dev = &client->dev;
 	u8 *bufp, buf[SILEAD_TS_DATA_LEN];
 	int touch_nr, softbutton, error, i;
 	bool softbutton_pressed = false;

 	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
 					      SILEAD_TS_DATA_LEN, buf);
 	if (error < 0) {
 		dev_err(dev, "Data read error %d\n", error);
 		return;
 	}

 	if (buf[0] > data->max_fingers) {
 		dev_warn(dev, "More touches reported then supported %d > %d\n",
 			 buf[0], data->max_fingers);
 		buf[0] = data->max_fingers;
 	}

 	touch_nr = 0;
 	bufp = buf + SILEAD_POINT_DATA_LEN;
 	for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
 		softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
 			      SILEAD_EXTRA_DATA_MASK) >> 4;

 		if (softbutton) {
 			/*
 			 * For now only respond to softbutton == 0x01, some
 			 * tablets *without* a capacative button send 0x04
 			 * when crossing the edges of the screen.
 			 */
 			if (softbutton == 0x01)
 				softbutton_pressed = true;

 			continue;
 		}

 		/*
 		 * Bits 4-7 are the touch id, note not all models have
 		 * hardware touch ids so atm we don't use these.
 		 */
 		data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
 				      SILEAD_EXTRA_DATA_MASK) >> 4;
 		touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
 			get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
 			get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
 		touch_nr++;
 	}

 	input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);

 	for (i = 0; i < touch_nr; i++) {
 		input_mt_slot(input, data->slots[i]);
 		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 		input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
 		input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);

 		dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
 			data->pos[i].y, data->id[i], data->slots[i]);
 	}

 	input_mt_sync_frame(input);
 	input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
 	input_sync(input);
 }

 static int silead_ts_init(struct i2c_client *client)
 {
 	struct silead_ts_data *data = i2c_get_clientdata(client);
 	int error;

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
 					  SILEAD_CMD_RESET);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
 					data->max_fingers);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
 					  SILEAD_CLOCK);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
 					  SILEAD_CMD_START);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	return 0;

 i2c_write_err:
 	dev_err(&client->dev, "Registers clear error %d\n", error);
 	return error;
 }

 static int silead_ts_reset(struct i2c_client *client)
 {
 	int error;

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
 					  SILEAD_CMD_RESET);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
 					  SILEAD_CLOCK);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
 					  SILEAD_CMD_START);
 	if (error)
 		goto i2c_write_err;
 	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

 	return 0;

 i2c_write_err:
 	dev_err(&client->dev, "Chip reset error %d\n", error);
 	return error;
 }

 static int silead_ts_startup(struct i2c_client *client)
 {
 	int error;

 	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
 	if (error) {
 		dev_err(&client->dev, "Startup error %d\n", error);
 		return error;
 	}

 	msleep(SILEAD_STARTUP_SLEEP);

 	return 0;
 }

 static int silead_ts_load_fw(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct silead_ts_data *data = i2c_get_clientdata(client);
 	unsigned int fw_size, i;
 	const struct firmware *fw;
 	struct silead_fw_data *fw_data;
 	int error;

 	dev_dbg(dev, "Firmware file name: %s", data->fw_name);

 	error = firmware_request_platform(&fw, data->fw_name, dev);
 	if (error) {
 		dev_err(dev, "Firmware request error %d\n", error);
 		return error;
 	}

 	fw_size = fw->size / sizeof(*fw_data);
 	fw_data = (struct silead_fw_data *)fw->data;

 	for (i = 0; i < fw_size; i++) {
 		error = i2c_smbus_write_i2c_block_data(client,
 						       fw_data[i].offset,
 						       4,
 						       (u8 *)&fw_data[i].val);
 		if (error) {
 			dev_err(dev, "Firmware load error %d\n", error);
 			break;
 		}
 	}

 	release_firmware(fw);
 	return error ?: 0;
 }

 static u32 silead_ts_get_status(struct i2c_client *client)
 {
 	int error;
 	__le32 status;

 	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
 					      sizeof(status), (u8 *)&status);
 	if (error < 0) {
 		dev_err(&client->dev, "Status read error %d\n", error);
 		return error;
 	}

 	return le32_to_cpu(status);
 }

 static int silead_ts_get_id(struct i2c_client *client)
 {
 	struct silead_ts_data *data = i2c_get_clientdata(client);
 	__le32 chip_id;
 	int error;

 	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
 					      sizeof(chip_id), (u8 *)&chip_id);
 	if (error < 0) {
 		dev_err(&client->dev, "Chip ID read error %d\n", error);
 		return error;
 	}

 	data->chip_id = le32_to_cpu(chip_id);
 	dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);

 	return 0;
 }

 static int silead_ts_setup(struct i2c_client *client)
 {
 	int error;
 	u32 status;

 	silead_ts_set_power(client, SILEAD_POWER_OFF);
 	silead_ts_set_power(client, SILEAD_POWER_ON);

 	error = silead_ts_get_id(client);
 	if (error)
 		return error;

 	error = silead_ts_init(client);
 	if (error)
 		return error;

 	error = silead_ts_reset(client);
 	if (error)
 		return error;

 	error = silead_ts_load_fw(client);
 	if (error)
 		return error;

 	error = silead_ts_startup(client);
 	if (error)
 		return error;

 	status = silead_ts_get_status(client);
 	if (status != SILEAD_STATUS_OK) {
 		dev_err(&client->dev,
 			"Initialization error, status: 0x%X\n", status);
 		return -ENODEV;
 	}

 	return 0;
 }

 static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
 {
 	struct silead_ts_data *data = id;
 	struct i2c_client *client = data->client;

 	silead_ts_read_data(client);

 	return IRQ_HANDLED;
 }

 static void silead_ts_read_props(struct i2c_client *client)
 {
 	struct silead_ts_data *data = i2c_get_clientdata(client);
 	struct device *dev = &client->dev;
 	const char *str;
 	int error;

 	error = device_property_read_u32(dev, "silead,max-fingers",
 					 &data->max_fingers);
 	if (error) {
 		dev_dbg(dev, "Max fingers read error %d\n", error);
 		data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
 	}

 	error = device_property_read_string(dev, "firmware-name", &str);
 	if (!error)
 		snprintf(data->fw_name, sizeof(data->fw_name),
 			 "silead/%s", str);
 	else
 		dev_dbg(dev, "Firmware file name read error. Using default.");
 }

 #ifdef CONFIG_ACPI
 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
 					 const struct i2c_device_id *id)
 {
 	const struct acpi_device_id *acpi_id;
 	struct device *dev = &data->client->dev;
 	int i;

 	if (ACPI_HANDLE(dev)) {
 		acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
 		if (!acpi_id)
 			return -ENODEV;

 		snprintf(data->fw_name, sizeof(data->fw_name),
 			 "silead/%s.fw", acpi_id->id);

 		for (i = 0; i < strlen(data->fw_name); i++)
 			data->fw_name[i] = tolower(data->fw_name[i]);
 	} else {
 		snprintf(data->fw_name, sizeof(data->fw_name),
 			 "silead/%s.fw", id->name);
 	}

 	return 0;
 }
 #else
 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
 					 const struct i2c_device_id *id)
 {
 	snprintf(data->fw_name, sizeof(data->fw_name),
 		 "silead/%s.fw", id->name);
 	return 0;
 }
 #endif

 static void silead_disable_regulator(void *arg)
 {
 	struct silead_ts_data *data = arg;

 	regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
 }

 static int silead_ts_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
 	struct silead_ts_data *data;
 	struct device *dev = &client->dev;
 	int error;

 	if (!i2c_check_functionality(client->adapter,
 				     I2C_FUNC_I2C |
 				     I2C_FUNC_SMBUS_READ_I2C_BLOCK |
 				     I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
 		dev_err(dev, "I2C functionality check failed\n");
 		return -ENXIO;
 	}

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

 	i2c_set_clientdata(client, data);
 	data->client = client;

 	error = silead_ts_set_default_fw_name(data, id);
 	if (error)
 		return error;

 	silead_ts_read_props(client);

 	/* We must have the IRQ provided by DT or ACPI subsytem */
 	if (client->irq <= 0)
 		return -ENODEV;

 	data->regulators[0].supply = "vddio";
 	data->regulators[1].supply = "avdd";
 	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
 					data->regulators);
 	if (error)
 		return error;

 	/*
 	 * Enable regulators at probe and disable them at remove, we need
 	 * to keep the chip powered otherwise it forgets its firmware.
 	 */
 	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
 				      data->regulators);
 	if (error)
 		return error;

 	error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
 	if (error)
 		return error;

 	/* Power GPIO pin */
 	data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
 	if (IS_ERR(data->gpio_power)) {
 		if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
 			dev_err(dev, "Shutdown GPIO request failed\n");
 		return PTR_ERR(data->gpio_power);
 	}

 	error = silead_ts_setup(client);
 	if (error)
 		return error;

 	error = silead_ts_request_input_dev(data);
 	if (error)
 		return error;

 	error = devm_request_threaded_irq(dev, client->irq,
 					  NULL, silead_ts_threaded_irq_handler,
 					  IRQF_ONESHOT, client->name, data);
 	if (error) {
 		if (error != -EPROBE_DEFER)
 			dev_err(dev, "IRQ request failed %d\n", error);
 		return error;
 	}

 	return 0;
 }

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

 	disable_irq(client->irq);
 	silead_ts_set_power(client, SILEAD_POWER_OFF);
 	return 0;
 }

 static int __maybe_unused silead_ts_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	bool second_try = false;
 	int error, status;

 	silead_ts_set_power(client, SILEAD_POWER_ON);

  retry:
 	error = silead_ts_reset(client);
 	if (error)
 		return error;

 	if (second_try) {
 		error = silead_ts_load_fw(client);
 		if (error)
 			return error;
 	}

 	error = silead_ts_startup(client);
 	if (error)
 		return error;

 	status = silead_ts_get_status(client);
 	if (status != SILEAD_STATUS_OK) {
 		if (!second_try) {
 			second_try = true;
 			dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
 			goto retry;
 		}
 		dev_err(dev, "Resume error, status: 0x%02x\n", status);
 		return -ENODEV;
 	}

 	enable_irq(client->irq);

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);

 static const struct i2c_device_id silead_ts_id[] = {
 	{ "gsl1680", 0 },
 	{ "gsl1688", 0 },
 	{ "gsl3670", 0 },
 	{ "gsl3675", 0 },
 	{ "gsl3692", 0 },
 	{ "mssl1680", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, silead_ts_id);

 #ifdef CONFIG_ACPI
 static const struct acpi_device_id silead_ts_acpi_match[] = {
 	{ "GSL1680", 0 },
 	{ "GSL1688", 0 },
 	{ "GSL3670", 0 },
 	{ "GSL3675", 0 },
 	{ "GSL3692", 0 },
 	{ "MSSL1680", 0 },
 	{ "MSSL0001", 0 },
 	{ "MSSL0002", 0 },
 	{ "MSSL0017", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
 #endif

 #ifdef CONFIG_OF
 static const struct of_device_id silead_ts_of_match[] = {
 	{ .compatible = "silead,gsl1680" },
 	{ .compatible = "silead,gsl1688" },
 	{ .compatible = "silead,gsl3670" },
 	{ .compatible = "silead,gsl3675" },
 	{ .compatible = "silead,gsl3692" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, silead_ts_of_match);
 #endif

 static struct i2c_driver silead_ts_driver = {
 	.probe = silead_ts_probe,
 	.id_table = silead_ts_id,
 	.driver = {
 		.name = SILEAD_TS_NAME,
 		.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
 		.of_match_table = of_match_ptr(silead_ts_of_match),
 		.pm = &silead_ts_pm,
 	},
 };
 module_i2c_driver(silead_ts_driver);

 MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
 MODULE_DESCRIPTION("Silead I2C touchscreen driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/* -------------------------------------------------------------------------
	* Copyright (C) 2014-2015, Intel Corporation
	*
	* Derived from:
	* gslX68X.c
	* Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
	*
	* -------------------------------------------------------------------------
	*/

	#include <linux/i2c.h>
	#include <linux/module.h>
	#include <linux/acpi.h>
	#include <linux/interrupt.h>
	#include <linux/gpio/consumer.h>
	#include <linux/delay.h>
	#include <linux/firmware.h>
	#include <linux/input.h>
	#include <linux/input/mt.h>
	#include <linux/input/touchscreen.h>
	#include <linux/pm.h>
	#include <linux/irq.h>
	#include <linux/regulator/consumer.h>

	#include <asm/unaligned.h>

	#define SILEAD_TS_NAME "silead_ts"

	#define SILEAD_REG_RESET 0xE0
	#define SILEAD_REG_DATA 0x80
	#define SILEAD_REG_TOUCH_NR 0x80
	#define SILEAD_REG_POWER 0xBC
	#define SILEAD_REG_CLOCK 0xE4
	#define SILEAD_REG_STATUS 0xB0
	#define SILEAD_REG_ID 0xFC
	#define SILEAD_REG_MEM_CHECK 0xB0

	#define SILEAD_STATUS_OK 0x5A5A5A5A
	#define SILEAD_TS_DATA_LEN 44
	#define SILEAD_CLOCK 0x04

	#define SILEAD_CMD_RESET 0x88
	#define SILEAD_CMD_START 0x00

	#define SILEAD_POINT_DATA_LEN 0x04
	#define SILEAD_POINT_Y_OFF 0x00
	#define SILEAD_POINT_Y_MSB_OFF 0x01
	#define SILEAD_POINT_X_OFF 0x02
	#define SILEAD_POINT_X_MSB_OFF 0x03
	#define SILEAD_EXTRA_DATA_MASK 0xF0

	#define SILEAD_CMD_SLEEP_MIN 10000
	#define SILEAD_CMD_SLEEP_MAX 20000
	#define SILEAD_POWER_SLEEP 20
	#define SILEAD_STARTUP_SLEEP 30

	#define SILEAD_MAX_FINGERS 10

	enum silead_ts_power {
	SILEAD_POWER_ON = 1,
	SILEAD_POWER_OFF = 0
	};

	struct silead_ts_data {
	struct i2c_client *client;
	struct gpio_desc *gpio_power;
	struct input_dev *input;
	struct regulator_bulk_data regulators[2];
	char fw_name[64];
	struct touchscreen_properties prop;
	u32 max_fingers;
	u32 chip_id;
	struct input_mt_pos pos[SILEAD_MAX_FINGERS];
	int slots[SILEAD_MAX_FINGERS];
	int id[SILEAD_MAX_FINGERS];
	};

	struct silead_fw_data {
	u32 offset;
	u32 val;
	};

	static int silead_ts_request_input_dev(struct silead_ts_data *data)
	{
	struct device *dev = &data->client->dev;
	int error;

	data->input = devm_input_allocate_device(dev);
	if (!data->input) {
	dev_err(dev,
	"Failed to allocate input device\n");
	return -ENOMEM;
	}

	input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
	input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
	touchscreen_parse_properties(data->input, true, &data->prop);

	input_mt_init_slots(data->input, data->max_fingers,
	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED \|
	INPUT_MT_TRACK);

	if (device_property_read_bool(dev, "silead,home-button"))
	input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);

	data->input->name = SILEAD_TS_NAME;
	data->input->phys = "input/ts";
	data->input->id.bustype = BUS_I2C;

	error = input_register_device(data->input);
	if (error) {
	dev_err(dev, "Failed to register input device: %d\n", error);
	return error;
	}

	return 0;
	}

	static void silead_ts_set_power(struct i2c_client *client,
	enum silead_ts_power state)
	{
	struct silead_ts_data *data = i2c_get_clientdata(client);

	if (data->gpio_power) {
	gpiod_set_value_cansleep(data->gpio_power, state);
	msleep(SILEAD_POWER_SLEEP);
	}
	}

	static void silead_ts_read_data(struct i2c_client *client)
	{
	struct silead_ts_data *data = i2c_get_clientdata(client);
	struct input_dev *input = data->input;
	struct device *dev = &client->dev;
	u8 *bufp, buf[SILEAD_TS_DATA_LEN];
	int touch_nr, softbutton, error, i;
	bool softbutton_pressed = false;

	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
	SILEAD_TS_DATA_LEN, buf);
	if (error < 0) {
	dev_err(dev, "Data read error %d\n", error);
	return;
	}

	if (buf[0] > data->max_fingers) {
	dev_warn(dev, "More touches reported then supported %d > %d\n",
	buf[0], data->max_fingers);
	buf[0] = data->max_fingers;
	}

	touch_nr = 0;
	bufp = buf + SILEAD_POINT_DATA_LEN;
	for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
	softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
	SILEAD_EXTRA_DATA_MASK) >> 4;

	if (softbutton) {
	/*
	* For now only respond to softbutton == 0x01, some
	* tablets without a capacative button send 0x04
	* when crossing the edges of the screen.
	*/
	if (softbutton == 0x01)
	softbutton_pressed = true;

	continue;
	}

	/*
	* Bits 4-7 are the touch id, note not all models have
	* hardware touch ids so atm we don't use these.
	*/
	data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
	SILEAD_EXTRA_DATA_MASK) >> 4;
	touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
	get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
	get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
	touch_nr++;
	}

	input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);

	for (i = 0; i < touch_nr; i++) {
	input_mt_slot(input, data->slots[i]);
	input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
	input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
	input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);

	dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
	data->pos[i].y, data->id[i], data->slots[i]);
	}

	input_mt_sync_frame(input);
	input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
	input_sync(input);
	}

	static int silead_ts_init(struct i2c_client *client)
	{
	struct silead_ts_data *data = i2c_get_clientdata(client);
	int error;

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
	SILEAD_CMD_RESET);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
	data->max_fingers);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
	SILEAD_CLOCK);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
	SILEAD_CMD_START);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	return 0;

	i2c_write_err:
	dev_err(&client->dev, "Registers clear error %d\n", error);
	return error;
	}

	static int silead_ts_reset(struct i2c_client *client)
	{
	int error;

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
	SILEAD_CMD_RESET);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
	SILEAD_CLOCK);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
	SILEAD_CMD_START);
	if (error)
	goto i2c_write_err;
	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

	return 0;

	i2c_write_err:
	dev_err(&client->dev, "Chip reset error %d\n", error);
	return error;
	}

	static int silead_ts_startup(struct i2c_client *client)
	{
	int error;

	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
	if (error) {
	dev_err(&client->dev, "Startup error %d\n", error);
	return error;
	}

	msleep(SILEAD_STARTUP_SLEEP);

	return 0;
	}

	static int silead_ts_load_fw(struct i2c_client *client)
	{
	struct device *dev = &client->dev;
	struct silead_ts_data *data = i2c_get_clientdata(client);
	unsigned int fw_size, i;
	const struct firmware *fw;
	struct silead_fw_data *fw_data;
	int error;

	dev_dbg(dev, "Firmware file name: %s", data->fw_name);

	error = firmware_request_platform(&fw, data->fw_name, dev);
	if (error) {
	dev_err(dev, "Firmware request error %d\n", error);
	return error;
	}

	fw_size = fw->size / sizeof(*fw_data);
	fw_data = (struct silead_fw_data *)fw->data;

	for (i = 0; i < fw_size; i++) {
	error = i2c_smbus_write_i2c_block_data(client,
	fw_data[i].offset,
	4,
	(u8 *)&fw_data[i].val);
	if (error) {
	dev_err(dev, "Firmware load error %d\n", error);
	break;
	}
	}

	release_firmware(fw);
	return error ?: 0;
	}

	static u32 silead_ts_get_status(struct i2c_client *client)
	{
	int error;
	__le32 status;

	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
	sizeof(status), (u8 *)&status);
	if (error < 0) {
	dev_err(&client->dev, "Status read error %d\n", error);
	return error;
	}

	return le32_to_cpu(status);
	}

	static int silead_ts_get_id(struct i2c_client *client)
	{
	struct silead_ts_data *data = i2c_get_clientdata(client);
	__le32 chip_id;
	int error;

	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
	sizeof(chip_id), (u8 *)&chip_id);
	if (error < 0) {
	dev_err(&client->dev, "Chip ID read error %d\n", error);
	return error;
	}

	data->chip_id = le32_to_cpu(chip_id);
	dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);

	return 0;
	}

	static int silead_ts_setup(struct i2c_client *client)
	{
	int error;
	u32 status;

	silead_ts_set_power(client, SILEAD_POWER_OFF);
	silead_ts_set_power(client, SILEAD_POWER_ON);

	error = silead_ts_get_id(client);
	if (error)
	return error;

	error = silead_ts_init(client);
	if (error)
	return error;

	error = silead_ts_reset(client);
	if (error)
	return error;

	error = silead_ts_load_fw(client);
	if (error)
	return error;

	error = silead_ts_startup(client);
	if (error)
	return error;

	status = silead_ts_get_status(client);
	if (status != SILEAD_STATUS_OK) {
	dev_err(&client->dev,
	"Initialization error, status: 0x%X\n", status);
	return -ENODEV;
	}

	return 0;
	}

	static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
	{
	struct silead_ts_data *data = id;
	struct i2c_client *client = data->client;

	silead_ts_read_data(client);

	return IRQ_HANDLED;
	}

	static void silead_ts_read_props(struct i2c_client *client)
	{
	struct silead_ts_data *data = i2c_get_clientdata(client);
	struct device *dev = &client->dev;
	const char *str;
	int error;

	error = device_property_read_u32(dev, "silead,max-fingers",
	&data->max_fingers);
	if (error) {
	dev_dbg(dev, "Max fingers read error %d\n", error);
	data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
	}

	error = device_property_read_string(dev, "firmware-name", &str);
	if (!error)
	snprintf(data->fw_name, sizeof(data->fw_name),
	"silead/%s", str);
	else
	dev_dbg(dev, "Firmware file name read error. Using default.");
	}

	#ifdef CONFIG_ACPI
	static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
	const struct i2c_device_id *id)
	{
	const struct acpi_device_id *acpi_id;
	struct device *dev = &data->client->dev;
	int i;

	if (ACPI_HANDLE(dev)) {
	acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
	if (!acpi_id)
	return -ENODEV;

	snprintf(data->fw_name, sizeof(data->fw_name),
	"silead/%s.fw", acpi_id->id);

	for (i = 0; i < strlen(data->fw_name); i++)
	data->fw_name[i] = tolower(data->fw_name[i]);
	} else {
	snprintf(data->fw_name, sizeof(data->fw_name),
	"silead/%s.fw", id->name);
	}

	return 0;
	}
	#else
	static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
	const struct i2c_device_id *id)
	{
	snprintf(data->fw_name, sizeof(data->fw_name),
	"silead/%s.fw", id->name);
	return 0;
	}
	#endif

	static void silead_disable_regulator(void *arg)
	{
	struct silead_ts_data *data = arg;

	regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
	}

	static int silead_ts_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct silead_ts_data *data;
	struct device *dev = &client->dev;
	int error;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_I2C \|
	I2C_FUNC_SMBUS_READ_I2C_BLOCK \|
	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
	dev_err(dev, "I2C functionality check failed\n");
	return -ENXIO;
	}

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

	i2c_set_clientdata(client, data);
	data->client = client;

	error = silead_ts_set_default_fw_name(data, id);
	if (error)
	return error;

	silead_ts_read_props(client);

	/* We must have the IRQ provided by DT or ACPI subsytem */
	if (client->irq <= 0)
	return -ENODEV;

	data->regulators[0].supply = "vddio";
	data->regulators[1].supply = "avdd";
	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
	data->regulators);
	if (error)
	return error;

	/*
	* Enable regulators at probe and disable them at remove, we need
	* to keep the chip powered otherwise it forgets its firmware.
	*/
	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
	data->regulators);
	if (error)
	return error;

	error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
	if (error)
	return error;

	/* Power GPIO pin */
	data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
	if (IS_ERR(data->gpio_power)) {
	if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
	dev_err(dev, "Shutdown GPIO request failed\n");
	return PTR_ERR(data->gpio_power);
	}

	error = silead_ts_setup(client);
	if (error)
	return error;

	error = silead_ts_request_input_dev(data);
	if (error)
	return error;

	error = devm_request_threaded_irq(dev, client->irq,
	NULL, silead_ts_threaded_irq_handler,
	IRQF_ONESHOT, client->name, data);
	if (error) {
	if (error != -EPROBE_DEFER)
	dev_err(dev, "IRQ request failed %d\n", error);
	return error;
	}

	return 0;
	}

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

	disable_irq(client->irq);
	silead_ts_set_power(client, SILEAD_POWER_OFF);
	return 0;
	}

	static int __maybe_unused silead_ts_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	bool second_try = false;
	int error, status;

	silead_ts_set_power(client, SILEAD_POWER_ON);

	retry:
	error = silead_ts_reset(client);
	if (error)
	return error;

	if (second_try) {
	error = silead_ts_load_fw(client);
	if (error)
	return error;
	}

	error = silead_ts_startup(client);
	if (error)
	return error;

	status = silead_ts_get_status(client);
	if (status != SILEAD_STATUS_OK) {
	if (!second_try) {
	second_try = true;
	dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
	goto retry;
	}
	dev_err(dev, "Resume error, status: 0x%02x\n", status);
	return -ENODEV;
	}

	enable_irq(client->irq);

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);

	static const struct i2c_device_id silead_ts_id[] = {
	{ "gsl1680", 0 },
	{ "gsl1688", 0 },
	{ "gsl3670", 0 },
	{ "gsl3675", 0 },
	{ "gsl3692", 0 },
	{ "mssl1680", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, silead_ts_id);

	#ifdef CONFIG_ACPI
	static const struct acpi_device_id silead_ts_acpi_match[] = {
	{ "GSL1680", 0 },
	{ "GSL1688", 0 },
	{ "GSL3670", 0 },
	{ "GSL3675", 0 },
	{ "GSL3692", 0 },
	{ "MSSL1680", 0 },
	{ "MSSL0001", 0 },
	{ "MSSL0002", 0 },
	{ "MSSL0017", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
	#endif

	#ifdef CONFIG_OF
	static const struct of_device_id silead_ts_of_match[] = {
	{ .compatible = "silead,gsl1680" },
	{ .compatible = "silead,gsl1688" },
	{ .compatible = "silead,gsl3670" },
	{ .compatible = "silead,gsl3675" },
	{ .compatible = "silead,gsl3692" },
	{ },
	};
	MODULE_DEVICE_TABLE(of, silead_ts_of_match);
	#endif

	static struct i2c_driver silead_ts_driver = {
	.probe = silead_ts_probe,
	.id_table = silead_ts_id,
	.driver = {
	.name = SILEAD_TS_NAME,
	.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
	.of_match_table = of_match_ptr(silead_ts_of_match),
	.pm = &silead_ts_pm,
	},
	};
	module_i2c_driver(silead_ts_driver);

	MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
	MODULE_DESCRIPTION("Silead I2C touchscreen driver");
	MODULE_LICENSE("GPL");