drivers/input/touchscreen/himax_hx83112b.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for Himax hx83112b touchscreens
  *
  * Copyright (C) 2022 Job Noorman <job@noorman.info>
  *
  * HX83100A support
  * Copyright (C) 2024 Felix Kaechele <felix@kaechele.ca>
  *
  * This code is based on "Himax Android Driver Sample Code for QCT platform":
  *
  * Copyright (C) 2017 Himax Corporation.
  */

 #include <linux/delay.h>
 #include <linux/err.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/kernel.h>
 #include <linux/regmap.h>

 #define HIMAX_MAX_POINTS		10

 #define HIMAX_AHB_ADDR_BYTE_0			0x00
 #define HIMAX_AHB_ADDR_RDATA_BYTE_0		0x08
 #define HIMAX_AHB_ADDR_ACCESS_DIRECTION		0x0c
 #define HIMAX_AHB_ADDR_INCR4			0x0d
 #define HIMAX_AHB_ADDR_CONTI			0x13
 #define HIMAX_AHB_ADDR_EVENT_STACK		0x30

 #define HIMAX_AHB_CMD_ACCESS_DIRECTION_READ	0x00
 #define HIMAX_AHB_CMD_INCR4			0x10
 #define HIMAX_AHB_CMD_CONTI			0x31

 #define HIMAX_REG_ADDR_ICID			0x900000d0

 #define HX83100A_REG_FW_EVENT_STACK		0x90060000

 #define HIMAX_INVALID_COORD		0xffff

 struct himax_event_point {
 	__be16 x;
 	__be16 y;
 } __packed;

 struct himax_event {
 	struct himax_event_point points[HIMAX_MAX_POINTS];
 	u8 majors[HIMAX_MAX_POINTS];
 	u8 pad0[2];
 	u8 num_points;
 	u8 pad1[2];
 	u8 checksum_fix;
 } __packed;

 static_assert(sizeof(struct himax_event) == 56);

 struct himax_ts_data;
 struct himax_chip {
 	u32 id;
 	int (*check_id)(struct himax_ts_data *ts);
 	int (*read_events)(struct himax_ts_data *ts, struct himax_event *event,
 			   size_t length);
 };

 struct himax_ts_data {
 	const struct himax_chip *chip;
 	struct gpio_desc *gpiod_rst;
 	struct input_dev *input_dev;
 	struct i2c_client *client;
 	struct regmap *regmap;
 	struct touchscreen_properties props;
 };

 static const struct regmap_config himax_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 32,
 	.val_format_endian = REGMAP_ENDIAN_LITTLE,
 };

 static int himax_bus_enable_burst(struct himax_ts_data *ts)
 {
 	int error;

 	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_CONTI,
 			     HIMAX_AHB_CMD_CONTI);
 	if (error)
 		return error;

 	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_INCR4,
 			     HIMAX_AHB_CMD_INCR4);
 	if (error)
 		return error;

 	return 0;
 }

 static int himax_bus_read(struct himax_ts_data *ts, u32 address, void *dst,
 			  size_t length)
 {
 	int error;

 	if (length > 4) {
 		error = himax_bus_enable_burst(ts);
 		if (error)
 			return error;
 	}

 	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_BYTE_0, address);
 	if (error)
 		return error;

 	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_ACCESS_DIRECTION,
 			     HIMAX_AHB_CMD_ACCESS_DIRECTION_READ);
 	if (error)
 		return error;

 	if (length > 4)
 		error = regmap_noinc_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0,
 					  dst, length);
 	else
 		error = regmap_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0,
 				    dst);
 	if (error)
 		return error;

 	return 0;
 }

 static int himax_read_mcu(struct himax_ts_data *ts, u32 address, u32 *dst)
 {
 	int error;

 	error = himax_bus_read(ts, address, dst, sizeof(dst));
 	if (error)
 		return error;

 	return 0;
 }

 static void himax_reset(struct himax_ts_data *ts)
 {
 	gpiod_set_value_cansleep(ts->gpiod_rst, 1);

 	/* Delay copied from downstream driver */
 	msleep(20);
 	gpiod_set_value_cansleep(ts->gpiod_rst, 0);

 	/*
 	 * The downstream driver doesn't contain this delay but is seems safer
 	 * to include it. The range is just a guess that seems to work well.
 	 */
 	usleep_range(1000, 1100);
 }

 static int himax_read_product_id(struct himax_ts_data *ts, u32 *product_id)
 {
 	int error;

 	error = himax_read_mcu(ts, HIMAX_REG_ADDR_ICID, product_id);
 	if (error)
 		return error;

 	*product_id >>= 8;
 	return 0;
 }

 static int himax_check_product_id(struct himax_ts_data *ts)
 {
 	int error;
 	u32 product_id;

 	error = himax_read_product_id(ts, &product_id);
 	if (error)
 		return error;

 	dev_dbg(&ts->client->dev, "Product id: %x\n", product_id);

 	if (product_id == ts->chip->id)
 		return 0;

 	dev_err(&ts->client->dev, "Unknown product id: %x\n",
 		product_id);
 	return -EINVAL;
 }

 static int himax_input_register(struct himax_ts_data *ts)
 {
 	int error;

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

 	ts->input_dev->name = "Himax Touchscreen";

 	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
 	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
 	input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 200, 0, 0);
 	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 200, 0, 0);

 	touchscreen_parse_properties(ts->input_dev, true, &ts->props);

 	error = input_mt_init_slots(ts->input_dev, HIMAX_MAX_POINTS,
 				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 	if (error) {
 		dev_err(&ts->client->dev,
 			"Failed to initialize MT slots: %d\n", error);
 		return error;
 	}

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

 	return 0;
 }

 static u8 himax_event_get_num_points(const struct himax_event *event)
 {
 	if (event->num_points == 0xff)
 		return 0;
 	else
 		return event->num_points & 0x0f;
 }

 static bool himax_process_event_point(struct himax_ts_data *ts,
 				      const struct himax_event *event,
 				      int point_index)
 {
 	const struct himax_event_point *point = &event->points[point_index];
 	u16 x = be16_to_cpu(point->x);
 	u16 y = be16_to_cpu(point->y);
 	u8 w = event->majors[point_index];

 	if (x == HIMAX_INVALID_COORD || y == HIMAX_INVALID_COORD)
 		return false;

 	input_mt_slot(ts->input_dev, point_index);
 	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
 	touchscreen_report_pos(ts->input_dev, &ts->props, x, y, true);
 	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, w);
 	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, w);
 	return true;
 }

 static void himax_process_event(struct himax_ts_data *ts,
 				const struct himax_event *event)
 {
 	int i;
 	int num_points_left = himax_event_get_num_points(event);

 	for (i = 0; i < HIMAX_MAX_POINTS && num_points_left > 0; i++) {
 		if (himax_process_event_point(ts, event, i))
 			num_points_left--;
 	}

 	input_mt_sync_frame(ts->input_dev);
 	input_sync(ts->input_dev);
 }

 static bool himax_verify_checksum(struct himax_ts_data *ts,
 				  const struct himax_event *event)
 {
 	u8 *data = (u8 *)event;
 	int i;
 	u16 checksum = 0;

 	for (i = 0; i < sizeof(*event); i++)
 		checksum += data[i];

 	if ((checksum & 0x00ff) != 0) {
 		dev_err(&ts->client->dev, "Wrong event checksum: %04x\n",
 			checksum);
 		return false;
 	}

 	return true;
 }

 static int himax_read_events(struct himax_ts_data *ts,
 			     struct himax_event *event, size_t length)
 {
 	return regmap_raw_read(ts->regmap, HIMAX_AHB_ADDR_EVENT_STACK, event,
 			       length);
 }

 static int hx83100a_read_events(struct himax_ts_data *ts,
 				struct himax_event *event, size_t length)
 {
 	return himax_bus_read(ts, HX83100A_REG_FW_EVENT_STACK, event, length);
 };

 static int himax_handle_input(struct himax_ts_data *ts)
 {
 	int error;
 	struct himax_event event;

 	error = ts->chip->read_events(ts, &event, sizeof(event));
 	if (error) {
 		dev_err(&ts->client->dev, "Failed to read input event: %d\n",
 			error);
 		return error;
 	}

 	/*
 	 * Only process the current event when it has a valid checksum but
 	 * don't consider it a fatal error when it doesn't.
 	 */
 	if (himax_verify_checksum(ts, &event))
 		himax_process_event(ts, &event);

 	return 0;
 }

 static irqreturn_t himax_irq_handler(int irq, void *dev_id)
 {
 	int error;
 	struct himax_ts_data *ts = dev_id;

 	error = himax_handle_input(ts);
 	if (error)
 		return IRQ_NONE;

 	return IRQ_HANDLED;
 }

 static int himax_probe(struct i2c_client *client)
 {
 	int error;
 	struct device *dev = &client->dev;
 	struct himax_ts_data *ts;

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

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

 	i2c_set_clientdata(client, ts);
 	ts->client = client;
 	ts->chip = i2c_get_match_data(client);

 	ts->regmap = devm_regmap_init_i2c(client, &himax_regmap_config);
 	error = PTR_ERR_OR_ZERO(ts->regmap);
 	if (error) {
 		dev_err(dev, "Failed to initialize regmap: %d\n", error);
 		return error;
 	}

 	ts->gpiod_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 	error = PTR_ERR_OR_ZERO(ts->gpiod_rst);
 	if (error) {
 		dev_err(dev, "Failed to get reset GPIO: %d\n", error);
 		return error;
 	}

 	himax_reset(ts);

 	if (ts->chip->check_id) {
 		error = himax_check_product_id(ts);
 		if (error)
 			return error;
 	}

 	error = himax_input_register(ts);
 	if (error)
 		return error;

 	error = devm_request_threaded_irq(dev, client->irq, NULL,
 					  himax_irq_handler, IRQF_ONESHOT,
 					  client->name, ts);
 	if (error)
 		return error;

 	return 0;
 }

 static int himax_suspend(struct device *dev)
 {
 	struct himax_ts_data *ts = dev_get_drvdata(dev);

 	disable_irq(ts->client->irq);
 	return 0;
 }

 static int himax_resume(struct device *dev)
 {
 	struct himax_ts_data *ts = dev_get_drvdata(dev);

 	enable_irq(ts->client->irq);
 	return 0;
 }

 static DEFINE_SIMPLE_DEV_PM_OPS(himax_pm_ops, himax_suspend, himax_resume);

 static const struct himax_chip hx83100a_chip = {
 	.read_events = hx83100a_read_events,
 };

 static const struct himax_chip hx83112b_chip = {
 	.id = 0x83112b,
 	.check_id = himax_check_product_id,
 	.read_events = himax_read_events,
 };

 static const struct i2c_device_id himax_ts_id[] = {
 	{ "hx83100a", (kernel_ulong_t)&hx83100a_chip },
 	{ "hx83112b", (kernel_ulong_t)&hx83112b_chip },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(i2c, himax_ts_id);

 #ifdef CONFIG_OF
 static const struct of_device_id himax_of_match[] = {
 	{ .compatible = "himax,hx83100a", .data = &hx83100a_chip },
 	{ .compatible = "himax,hx83112b", .data = &hx83112b_chip },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, himax_of_match);
 #endif

 static struct i2c_driver himax_ts_driver = {
 	.probe = himax_probe,
 	.id_table = himax_ts_id,
 	.driver = {
 		.name = "Himax-hx83112b-TS",
 		.of_match_table = of_match_ptr(himax_of_match),
 		.pm = pm_sleep_ptr(&himax_pm_ops),
 	},
 };
 module_i2c_driver(himax_ts_driver);

 MODULE_AUTHOR("Job Noorman <job@noorman.info>");
 MODULE_DESCRIPTION("Himax hx83112b touchscreen driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Driver for Himax hx83112b touchscreens
	*
	* Copyright (C) 2022 Job Noorman <job@noorman.info>
	*
	* HX83100A support
	* Copyright (C) 2024 Felix Kaechele <felix@kaechele.ca>
	*
	* This code is based on "Himax Android Driver Sample Code for QCT platform":
	*
	* Copyright (C) 2017 Himax Corporation.
	*/

	#include <linux/delay.h>
	#include <linux/err.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/kernel.h>
	#include <linux/regmap.h>

	#define HIMAX_MAX_POINTS 10

	#define HIMAX_AHB_ADDR_BYTE_0 0x00
	#define HIMAX_AHB_ADDR_RDATA_BYTE_0 0x08
	#define HIMAX_AHB_ADDR_ACCESS_DIRECTION 0x0c
	#define HIMAX_AHB_ADDR_INCR4 0x0d
	#define HIMAX_AHB_ADDR_CONTI 0x13
	#define HIMAX_AHB_ADDR_EVENT_STACK 0x30

	#define HIMAX_AHB_CMD_ACCESS_DIRECTION_READ 0x00
	#define HIMAX_AHB_CMD_INCR4 0x10
	#define HIMAX_AHB_CMD_CONTI 0x31

	#define HIMAX_REG_ADDR_ICID 0x900000d0

	#define HX83100A_REG_FW_EVENT_STACK 0x90060000

	#define HIMAX_INVALID_COORD 0xffff

	struct himax_event_point {
	__be16 x;
	__be16 y;
	} __packed;

	struct himax_event {
	struct himax_event_point points[HIMAX_MAX_POINTS];
	u8 majors[HIMAX_MAX_POINTS];
	u8 pad0[2];
	u8 num_points;
	u8 pad1[2];
	u8 checksum_fix;
	} __packed;

	static_assert(sizeof(struct himax_event) == 56);

	struct himax_ts_data;
	struct himax_chip {
	u32 id;
	int (check_id)(struct himax_ts_data ts);
	int (read_events)(struct himax_ts_data ts, struct himax_event *event,
	size_t length);
	};

	struct himax_ts_data {
	const struct himax_chip *chip;
	struct gpio_desc *gpiod_rst;
	struct input_dev *input_dev;
	struct i2c_client *client;
	struct regmap *regmap;
	struct touchscreen_properties props;
	};

	static const struct regmap_config himax_regmap_config = {
	.reg_bits = 8,
	.val_bits = 32,
	.val_format_endian = REGMAP_ENDIAN_LITTLE,
	};

	static int himax_bus_enable_burst(struct himax_ts_data *ts)
	{
	int error;

	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_CONTI,
	HIMAX_AHB_CMD_CONTI);
	if (error)
	return error;

	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_INCR4,
	HIMAX_AHB_CMD_INCR4);
	if (error)
	return error;

	return 0;
	}

	static int himax_bus_read(struct himax_ts_data ts, u32 address, void dst,
	size_t length)
	{
	int error;

	if (length > 4) {
	error = himax_bus_enable_burst(ts);
	if (error)
	return error;
	}

	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_BYTE_0, address);
	if (error)
	return error;

	error = regmap_write(ts->regmap, HIMAX_AHB_ADDR_ACCESS_DIRECTION,
	HIMAX_AHB_CMD_ACCESS_DIRECTION_READ);
	if (error)
	return error;

	if (length > 4)
	error = regmap_noinc_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0,
	dst, length);
	else
	error = regmap_read(ts->regmap, HIMAX_AHB_ADDR_RDATA_BYTE_0,
	dst);
	if (error)
	return error;

	return 0;
	}

	static int himax_read_mcu(struct himax_ts_data ts, u32 address, u32 dst)
	{
	int error;

	error = himax_bus_read(ts, address, dst, sizeof(dst));
	if (error)
	return error;

	return 0;
	}

	static void himax_reset(struct himax_ts_data *ts)
	{
	gpiod_set_value_cansleep(ts->gpiod_rst, 1);

	/* Delay copied from downstream driver */
	msleep(20);
	gpiod_set_value_cansleep(ts->gpiod_rst, 0);

	/*
	* The downstream driver doesn't contain this delay but is seems safer
	* to include it. The range is just a guess that seems to work well.
	*/
	usleep_range(1000, 1100);
	}

	static int himax_read_product_id(struct himax_ts_data ts, u32 product_id)
	{
	int error;

	error = himax_read_mcu(ts, HIMAX_REG_ADDR_ICID, product_id);
	if (error)
	return error;

	*product_id >>= 8;
	return 0;
	}

	static int himax_check_product_id(struct himax_ts_data *ts)
	{
	int error;
	u32 product_id;

	error = himax_read_product_id(ts, &product_id);
	if (error)
	return error;

	dev_dbg(&ts->client->dev, "Product id: %x\n", product_id);

	if (product_id == ts->chip->id)
	return 0;

	dev_err(&ts->client->dev, "Unknown product id: %x\n",
	product_id);
	return -EINVAL;
	}

	static int himax_input_register(struct himax_ts_data *ts)
	{
	int error;

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

	ts->input_dev->name = "Himax Touchscreen";

	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
	input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 200, 0, 0);
	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 200, 0, 0);

	touchscreen_parse_properties(ts->input_dev, true, &ts->props);

	error = input_mt_init_slots(ts->input_dev, HIMAX_MAX_POINTS,
	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	if (error) {
	dev_err(&ts->client->dev,
	"Failed to initialize MT slots: %d\n", error);
	return error;
	}

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

	return 0;
	}

	static u8 himax_event_get_num_points(const struct himax_event *event)
	{
	if (event->num_points == 0xff)
	return 0;
	else
	return event->num_points & 0x0f;
	}

	static bool himax_process_event_point(struct himax_ts_data *ts,
	const struct himax_event *event,
	int point_index)
	{
	const struct himax_event_point *point = &event->points[point_index];
	u16 x = be16_to_cpu(point->x);
	u16 y = be16_to_cpu(point->y);
	u8 w = event->majors[point_index];

	if (x == HIMAX_INVALID_COORD \|\| y == HIMAX_INVALID_COORD)
	return false;

	input_mt_slot(ts->input_dev, point_index);
	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
	touchscreen_report_pos(ts->input_dev, &ts->props, x, y, true);
	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, w);
	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, w);
	return true;
	}

	static void himax_process_event(struct himax_ts_data *ts,
	const struct himax_event *event)
	{
	int i;
	int num_points_left = himax_event_get_num_points(event);

	for (i = 0; i < HIMAX_MAX_POINTS && num_points_left > 0; i++) {
	if (himax_process_event_point(ts, event, i))
	num_points_left--;
	}

	input_mt_sync_frame(ts->input_dev);
	input_sync(ts->input_dev);
	}

	static bool himax_verify_checksum(struct himax_ts_data *ts,
	const struct himax_event *event)
	{
	u8 data = (u8 )event;
	int i;
	u16 checksum = 0;

	for (i = 0; i < sizeof(*event); i++)
	checksum += data[i];

	if ((checksum & 0x00ff) != 0) {
	dev_err(&ts->client->dev, "Wrong event checksum: %04x\n",
	checksum);
	return false;
	}

	return true;
	}

	static int himax_read_events(struct himax_ts_data *ts,
	struct himax_event *event, size_t length)
	{
	return regmap_raw_read(ts->regmap, HIMAX_AHB_ADDR_EVENT_STACK, event,
	length);
	}

	static int hx83100a_read_events(struct himax_ts_data *ts,
	struct himax_event *event, size_t length)
	{
	return himax_bus_read(ts, HX83100A_REG_FW_EVENT_STACK, event, length);
	};

	static int himax_handle_input(struct himax_ts_data *ts)
	{
	int error;
	struct himax_event event;

	error = ts->chip->read_events(ts, &event, sizeof(event));
	if (error) {
	dev_err(&ts->client->dev, "Failed to read input event: %d\n",
	error);
	return error;
	}

	/*
	* Only process the current event when it has a valid checksum but
	* don't consider it a fatal error when it doesn't.
	*/
	if (himax_verify_checksum(ts, &event))
	himax_process_event(ts, &event);

	return 0;
	}

	static irqreturn_t himax_irq_handler(int irq, void *dev_id)
	{
	int error;
	struct himax_ts_data *ts = dev_id;

	error = himax_handle_input(ts);
	if (error)
	return IRQ_NONE;

	return IRQ_HANDLED;
	}

	static int himax_probe(struct i2c_client *client)
	{
	int error;
	struct device *dev = &client->dev;
	struct himax_ts_data *ts;

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

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

	i2c_set_clientdata(client, ts);
	ts->client = client;
	ts->chip = i2c_get_match_data(client);

	ts->regmap = devm_regmap_init_i2c(client, &himax_regmap_config);
	error = PTR_ERR_OR_ZERO(ts->regmap);
	if (error) {
	dev_err(dev, "Failed to initialize regmap: %d\n", error);
	return error;
	}

	ts->gpiod_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	error = PTR_ERR_OR_ZERO(ts->gpiod_rst);
	if (error) {
	dev_err(dev, "Failed to get reset GPIO: %d\n", error);
	return error;
	}

	himax_reset(ts);

	if (ts->chip->check_id) {
	error = himax_check_product_id(ts);
	if (error)
	return error;
	}

	error = himax_input_register(ts);
	if (error)
	return error;

	error = devm_request_threaded_irq(dev, client->irq, NULL,
	himax_irq_handler, IRQF_ONESHOT,
	client->name, ts);
	if (error)
	return error;

	return 0;
	}

	static int himax_suspend(struct device *dev)
	{
	struct himax_ts_data *ts = dev_get_drvdata(dev);

	disable_irq(ts->client->irq);
	return 0;
	}

	static int himax_resume(struct device *dev)
	{
	struct himax_ts_data *ts = dev_get_drvdata(dev);

	enable_irq(ts->client->irq);
	return 0;
	}

	static DEFINE_SIMPLE_DEV_PM_OPS(himax_pm_ops, himax_suspend, himax_resume);

	static const struct himax_chip hx83100a_chip = {
	.read_events = hx83100a_read_events,
	};

	static const struct himax_chip hx83112b_chip = {
	.id = 0x83112b,
	.check_id = himax_check_product_id,
	.read_events = himax_read_events,
	};

	static const struct i2c_device_id himax_ts_id[] = {
	{ "hx83100a", (kernel_ulong_t)&hx83100a_chip },
	{ "hx83112b", (kernel_ulong_t)&hx83112b_chip },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(i2c, himax_ts_id);

	#ifdef CONFIG_OF
	static const struct of_device_id himax_of_match[] = {
	{ .compatible = "himax,hx83100a", .data = &hx83100a_chip },
	{ .compatible = "himax,hx83112b", .data = &hx83112b_chip },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, himax_of_match);
	#endif

	static struct i2c_driver himax_ts_driver = {
	.probe = himax_probe,
	.id_table = himax_ts_id,
	.driver = {
	.name = "Himax-hx83112b-TS",
	.of_match_table = of_match_ptr(himax_of_match),
	.pm = pm_sleep_ptr(&himax_pm_ops),
	},
	};
	module_i2c_driver(himax_ts_driver);

	MODULE_AUTHOR("Job Noorman <job@noorman.info>");
	MODULE_DESCRIPTION("Himax hx83112b touchscreen driver");
	MODULE_LICENSE("GPL");