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

/* -------------------------------------------------------------------------
 * Copyright (C) 2014-2015, Intel Corporation
 *
 * Derived from:
 *  gslX68X.c
 *  Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * -------------------------------------------------------------------------
 */

#include <linux/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 = request_firmware(&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 },
	{ }
};
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");
Commit	Line	Data
3197704c RD	1	/* -------------------------------------------------------------------------
	2	* Copyright (C) 2014-2015, Intel Corporation
	3	*
	4	* Derived from:
	5	* gslX68X.c
	6	* Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	* -------------------------------------------------------------------------
	18	*/
	19
	20	#include <linux/i2c.h>
	21	#include <linux/module.h>
	22	#include <linux/acpi.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/gpio/consumer.h>
	25	#include <linux/delay.h>
	26	#include <linux/firmware.h>
	27	#include <linux/input.h>
	28	#include <linux/input/mt.h>
	29	#include <linux/input/touchscreen.h>
	30	#include <linux/pm.h>
	31	#include <linux/irq.h>
6f6deb48	32	#include <linux/regulator/consumer.h>
3197704c RD	33
	34	#include <asm/unaligned.h>
	35
	36	#define SILEAD_TS_NAME "silead_ts"
	37
	38	#define SILEAD_REG_RESET 0xE0
	39	#define SILEAD_REG_DATA 0x80
	40	#define SILEAD_REG_TOUCH_NR 0x80
	41	#define SILEAD_REG_POWER 0xBC
	42	#define SILEAD_REG_CLOCK 0xE4
	43	#define SILEAD_REG_STATUS 0xB0
	44	#define SILEAD_REG_ID 0xFC
	45	#define SILEAD_REG_MEM_CHECK 0xB0
	46
	47	#define SILEAD_STATUS_OK 0x5A5A5A5A
	48	#define SILEAD_TS_DATA_LEN 44
	49	#define SILEAD_CLOCK 0x04
	50
	51	#define SILEAD_CMD_RESET 0x88
	52	#define SILEAD_CMD_START 0x00
	53
	54	#define SILEAD_POINT_DATA_LEN 0x04
	55	#define SILEAD_POINT_Y_OFF 0x00
	56	#define SILEAD_POINT_Y_MSB_OFF 0x01
	57	#define SILEAD_POINT_X_OFF 0x02
	58	#define SILEAD_POINT_X_MSB_OFF 0x03
eca3be9b	59	#define SILEAD_EXTRA_DATA_MASK 0xF0
3197704c RD	60
	61	#define SILEAD_CMD_SLEEP_MIN 10000
	62	#define SILEAD_CMD_SLEEP_MAX 20000
	63	#define SILEAD_POWER_SLEEP 20
	64	#define SILEAD_STARTUP_SLEEP 30
	65
	66	#define SILEAD_MAX_FINGERS 10
	67
	68	enum silead_ts_power {
	69	SILEAD_POWER_ON = 1,
	70	SILEAD_POWER_OFF = 0
	71	};
	72
	73	struct silead_ts_data {
	74	struct i2c_client *client;
	75	struct gpio_desc *gpio_power;
	76	struct input_dev *input;
6f6deb48	77	struct regulator_bulk_data regulators[2];
3197704c RD	78	char fw_name[64];
	79	struct touchscreen_properties prop;
	80	u32 max_fingers;
	81	u32 chip_id;
	82	struct input_mt_pos pos[SILEAD_MAX_FINGERS];
	83	int slots[SILEAD_MAX_FINGERS];
	84	int id[SILEAD_MAX_FINGERS];
	85	};
	86
	87	struct silead_fw_data {
	88	u32 offset;
	89	u32 val;
	90	};
	91
	92	static int silead_ts_request_input_dev(struct silead_ts_data *data)
	93	{
	94	struct device *dev = &data->client->dev;
	95	int error;
	96
	97	data->input = devm_input_allocate_device(dev);
	98	if (!data->input) {
	99	dev_err(dev,
	100	"Failed to allocate input device\n");
	101	return -ENOMEM;
	102	}
	103
	104	input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
	105	input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
	106	touchscreen_parse_properties(data->input, true, &data->prop);
	107
	108	input_mt_init_slots(data->input, data->max_fingers,
	109	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED \|
	110	INPUT_MT_TRACK);
	111
eca3be9b HG	112	if (device_property_read_bool(dev, "silead,home-button"))
	113	input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
	114
3197704c RD	115	data->input->name = SILEAD_TS_NAME;
	116	data->input->phys = "input/ts";
	117	data->input->id.bustype = BUS_I2C;
	118
	119	error = input_register_device(data->input);
	120	if (error) {
	121	dev_err(dev, "Failed to register input device: %d\n", error);
	122	return error;
	123	}
	124
	125	return 0;
	126	}
	127
	128	static void silead_ts_set_power(struct i2c_client *client,
	129	enum silead_ts_power state)
	130	{
	131	struct silead_ts_data *data = i2c_get_clientdata(client);
	132
	133	if (data->gpio_power) {
	134	gpiod_set_value_cansleep(data->gpio_power, state);
	135	msleep(SILEAD_POWER_SLEEP);
	136	}
	137	}
	138
	139	static void silead_ts_read_data(struct i2c_client *client)
	140	{
	141	struct silead_ts_data *data = i2c_get_clientdata(client);
	142	struct input_dev *input = data->input;
	143	struct device *dev = &client->dev;
	144	u8 *bufp, buf[SILEAD_TS_DATA_LEN];
eca3be9b HG	145	int touch_nr, softbutton, error, i;
eca3be9b HG	146	bool softbutton_pressed = false;
3197704c RD	147
	148	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
	149	SILEAD_TS_DATA_LEN, buf);
	150	if (error < 0) {
	151	dev_err(dev, "Data read error %d\n", error);
	152	return;
	153	}
	154
eca3be9b	155	if (buf[0] > data->max_fingers) {
3197704c	156	dev_warn(dev, "More touches reported then supported %d > %d\n",
eca3be9b HG	157	buf[0], data->max_fingers);
eca3be9b HG	158	buf[0] = data->max_fingers;
3197704c RD	159	}
3197704c RD	160
eca3be9b	161	touch_nr = 0;
3197704c	162	bufp = buf + SILEAD_POINT_DATA_LEN;
eca3be9b HG	163	for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
	164	softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
	165	SILEAD_EXTRA_DATA_MASK) >> 4;
	166
	167	if (softbutton) {
	168	/*
	169	* For now only respond to softbutton == 0x01, some
	170	* tablets without a capacative button send 0x04
	171	* when crossing the edges of the screen.
	172	*/
	173	if (softbutton == 0x01)
	174	softbutton_pressed = true;
	175
	176	continue;
	177	}
	178
	179	/*
	180	* Bits 4-7 are the touch id, note not all models have
	181	* hardware touch ids so atm we don't use these.
	182	*/
	183	data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
	184	SILEAD_EXTRA_DATA_MASK) >> 4;
	185	touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
3197704c RD	186	get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
3197704c RD	187	get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
eca3be9b	188	touch_nr++;
3197704c RD	189	}
	190
	191	input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
	192
	193	for (i = 0; i < touch_nr; i++) {
	194	input_mt_slot(input, data->slots[i]);
	195	input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
	196	input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
	197	input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
	198
	199	dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
	200	data->pos[i].y, data->id[i], data->slots[i]);
	201	}
	202
	203	input_mt_sync_frame(input);
eca3be9b	204	input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
3197704c RD	205	input_sync(input);
	206	}
	207
	208	static int silead_ts_init(struct i2c_client *client)
	209	{
	210	struct silead_ts_data *data = i2c_get_clientdata(client);
	211	int error;
	212
	213	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
	214	SILEAD_CMD_RESET);
	215	if (error)
	216	goto i2c_write_err;
	217	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	218
	219	error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
	220	data->max_fingers);
	221	if (error)
	222	goto i2c_write_err;
	223	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	224
	225	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
	226	SILEAD_CLOCK);
	227	if (error)
	228	goto i2c_write_err;
	229	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	230
	231	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
	232	SILEAD_CMD_START);
	233	if (error)
	234	goto i2c_write_err;
	235	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	236
	237	return 0;
	238
	239	i2c_write_err:
	240	dev_err(&client->dev, "Registers clear error %d\n", error);
	241	return error;
	242	}
	243
	244	static int silead_ts_reset(struct i2c_client *client)
	245	{
	246	int error;
	247
	248	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
	249	SILEAD_CMD_RESET);
	250	if (error)
	251	goto i2c_write_err;
	252	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	253
	254	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
	255	SILEAD_CLOCK);
	256	if (error)
	257	goto i2c_write_err;
	258	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	259
	260	error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
	261	SILEAD_CMD_START);
	262	if (error)
	263	goto i2c_write_err;
	264	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
	265
	266	return 0;
	267
	268	i2c_write_err:
269	dev_err(&client->dev, "Chip reset error %d\n", error);
270	return error;
271	}
272
273	static int silead_ts_startup(struct i2c_client *client)
274	{
275	int error;
276
277	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
278	if (error) {
279	dev_err(&client->dev, "Startup error %d\n", error);
280	return error;
281	}
282
283	msleep(SILEAD_STARTUP_SLEEP);
284
285	return 0;
286	}
287
288	static int silead_ts_load_fw(struct i2c_client *client)
289	{
290	struct device *dev = &client->dev;
291	struct silead_ts_data *data = i2c_get_clientdata(client);
292	unsigned int fw_size, i;
293	const struct firmware *fw;
294	struct silead_fw_data *fw_data;
295	int error;
296
297	dev_dbg(dev, "Firmware file name: %s", data->fw_name);
298
299	error = request_firmware(&fw, data->fw_name, dev);
300	if (error) {
301	dev_err(dev, "Firmware request error %d\n", error);
302	return error;
303	}
304
305	fw_size = fw->size / sizeof(*fw_data);
306	fw_data = (struct silead_fw_data *)fw->data;
307
308	for (i = 0; i < fw_size; i++) {
309	error = i2c_smbus_write_i2c_block_data(client,
310	fw_data[i].offset,
311	4,
312	(u8 *)&fw_data[i].val);
313	if (error) {
314	dev_err(dev, "Firmware load error %d\n", error);
315	break;
316	}
317	}
318
319	release_firmware(fw);
320	return error ?: 0;
321	}
322
323	static u32 silead_ts_get_status(struct i2c_client *client)
324	{
325	int error;
326	__le32 status;
327
328	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
329	sizeof(status), (u8 *)&status);
330	if (error < 0) {
331	dev_err(&client->dev, "Status read error %d\n", error);
332	return error;
333	}
334
335	return le32_to_cpu(status);
336	}
337
338	static int silead_ts_get_id(struct i2c_client *client)
339	{
340	struct silead_ts_data *data = i2c_get_clientdata(client);
341	__le32 chip_id;
342	int error;
343
344	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
345	sizeof(chip_id), (u8 *)&chip_id);
346	if (error < 0) {
347	dev_err(&client->dev, "Chip ID read error %d\n", error);
348	return error;
349	}
350
351	data->chip_id = le32_to_cpu(chip_id);
352	dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
353
354	return 0;
355	}
356
357	static int silead_ts_setup(struct i2c_client *client)
358	{
359	int error;
360	u32 status;
361
362	silead_ts_set_power(client, SILEAD_POWER_OFF);
363	silead_ts_set_power(client, SILEAD_POWER_ON);
364
365	error = silead_ts_get_id(client);
366	if (error)
367	return error;
368
369	error = silead_ts_init(client);
370	if (error)
371	return error;
372
373	error = silead_ts_reset(client);
374	if (error)
375	return error;
376
377	error = silead_ts_load_fw(client);
378	if (error)
379	return error;
380
381	error = silead_ts_startup(client);
382	if (error)
383	return error;
384
385	status = silead_ts_get_status(client);
386	if (status != SILEAD_STATUS_OK) {
387	dev_err(&client->dev,
388	"Initialization error, status: 0x%X\n", status);
389	return -ENODEV;
390	}
391
392	return 0;
393	}
394
395	static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
396	{
397	struct silead_ts_data *data = id;
398	struct i2c_client *client = data->client;
399
400	silead_ts_read_data(client);
401
402	return IRQ_HANDLED;
403	}
404
405	static void silead_ts_read_props(struct i2c_client *client)
406	{
407	struct silead_ts_data *data = i2c_get_clientdata(client);
408	struct device *dev = &client->dev;
409	const char *str;
410	int error;
411
412	error = device_property_read_u32(dev, "silead,max-fingers",
413	&data->max_fingers);
414	if (error) {
415	dev_dbg(dev, "Max fingers read error %d\n", error);
416	data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
417	}
418
43ba5883	419	error = device_property_read_string(dev, "firmware-name", &str);
3197704c	420	if (!error)
43ba5883 HG	421	snprintf(data->fw_name, sizeof(data->fw_name),
43ba5883 HG	422	"silead/%s", str);
3197704c RD	423	else
	424	dev_dbg(dev, "Firmware file name read error. Using default.");
	425	}
	426
	427	#ifdef CONFIG_ACPI
	428	static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
	429	const struct i2c_device_id *id)
	430	{
	431	const struct acpi_device_id *acpi_id;
	432	struct device *dev = &data->client->dev;
	433	int i;
	434
	435	if (ACPI_HANDLE(dev)) {
	436	acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
	437	if (!acpi_id)
	438	return -ENODEV;
	439
4af2ff91 HG	440	snprintf(data->fw_name, sizeof(data->fw_name),
4af2ff91 HG	441	"silead/%s.fw", acpi_id->id);
3197704c RD	442
	443	for (i = 0; i < strlen(data->fw_name); i++)
	444	data->fw_name[i] = tolower(data->fw_name[i]);
	445	} else {
4af2ff91 HG	446	snprintf(data->fw_name, sizeof(data->fw_name),
4af2ff91 HG	447	"silead/%s.fw", id->name);
3197704c RD	448	}
	449
	450	return 0;
	451	}
	452	#else
	453	static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
	454	const struct i2c_device_id *id)
	455	{
4af2ff91 HG	456	snprintf(data->fw_name, sizeof(data->fw_name),
4af2ff91 HG	457	"silead/%s.fw", id->name);
3197704c RD	458	return 0;
	459	}
	460	#endif
	461
6f6deb48 HG	462	static void silead_disable_regulator(void *arg)
	463	{
	464	struct silead_ts_data *data = arg;
	465
	466	regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
	467	}
	468
3197704c RD	469	static int silead_ts_probe(struct i2c_client *client,
	470	const struct i2c_device_id *id)
	471	{
	472	struct silead_ts_data *data;
	473	struct device *dev = &client->dev;
	474	int error;
	475
	476	if (!i2c_check_functionality(client->adapter,
	477	I2C_FUNC_I2C \|
	478	I2C_FUNC_SMBUS_READ_I2C_BLOCK \|
	479	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
	480	dev_err(dev, "I2C functionality check failed\n");
	481	return -ENXIO;
	482	}
	483
	484	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	485	if (!data)
	486	return -ENOMEM;
	487
	488	i2c_set_clientdata(client, data);
	489	data->client = client;
	490
	491	error = silead_ts_set_default_fw_name(data, id);
	492	if (error)
	493	return error;
	494
	495	silead_ts_read_props(client);
	496
	497	/* We must have the IRQ provided by DT or ACPI subsytem */
	498	if (client->irq <= 0)
	499	return -ENODEV;
	500
6f6deb48 HG	501	data->regulators[0].supply = "vddio";
	502	data->regulators[1].supply = "avdd";
	503	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
	504	data->regulators);
	505	if (error)
	506	return error;
	507
	508	/*
	509	* Enable regulators at probe and disable them at remove, we need
	510	* to keep the chip powered otherwise it forgets its firmware.
	511	*/
	512	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
	513	data->regulators);
	514	if (error)
	515	return error;
	516
	517	error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
	518	if (error)
	519	return error;
	520
3197704c	521	/* Power GPIO pin */
5cab4d84	522	data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
3197704c RD	523	if (IS_ERR(data->gpio_power)) {
	524	if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
	525	dev_err(dev, "Shutdown GPIO request failed\n");
	526	return PTR_ERR(data->gpio_power);
	527	}
	528
	529	error = silead_ts_setup(client);
	530	if (error)
	531	return error;
	532
	533	error = silead_ts_request_input_dev(data);
	534	if (error)
	535	return error;
	536
	537	error = devm_request_threaded_irq(dev, client->irq,
	538	NULL, silead_ts_threaded_irq_handler,
	539	IRQF_ONESHOT, client->name, data);
	540	if (error) {
	541	if (error != -EPROBE_DEFER)
	542	dev_err(dev, "IRQ request failed %d\n", error);
	543	return error;
	544	}
	545
	546	return 0;
	547	}
	548
	549	static int __maybe_unused silead_ts_suspend(struct device *dev)
	550	{
	551	struct i2c_client *client = to_i2c_client(dev);
	552
1943d172	553	disable_irq(client->irq);
3197704c RD	554	silead_ts_set_power(client, SILEAD_POWER_OFF);
	555	return 0;
	556	}
	557
	558	static int __maybe_unused silead_ts_resume(struct device *dev)
	559	{
	560	struct i2c_client *client = to_i2c_client(dev);
dde27443	561	bool second_try = false;
3197704c RD	562	int error, status;
	563
	564	silead_ts_set_power(client, SILEAD_POWER_ON);
	565
dde27443	566	retry:
3197704c RD	567	error = silead_ts_reset(client);
	568	if (error)
	569	return error;
	570
dde27443 JS	571	if (second_try) {
	572	error = silead_ts_load_fw(client);
	573	if (error)
	574	return error;
	575	}
	576
3197704c RD	577	error = silead_ts_startup(client);
	578	if (error)
	579	return error;
	580
	581	status = silead_ts_get_status(client);
	582	if (status != SILEAD_STATUS_OK) {
dde27443 JS	583	if (!second_try) {
	584	second_try = true;
	585	dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
	586	goto retry;
	587	}
3197704c RD	588	dev_err(dev, "Resume error, status: 0x%02x\n", status);
	589	return -ENODEV;
	590	}
	591
1943d172 HG	592	enable_irq(client->irq);
1943d172 HG	593
3197704c RD	594	return 0;
	595	}
	596
	597	static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
	598
	599	static const struct i2c_device_id silead_ts_id[] = {
	600	{ "gsl1680", 0 },
	601	{ "gsl1688", 0 },
	602	{ "gsl3670", 0 },
	603	{ "gsl3675", 0 },
	604	{ "gsl3692", 0 },
	605	{ "mssl1680", 0 },
	606	{ }
	607	};
	608	MODULE_DEVICE_TABLE(i2c, silead_ts_id);
	609
	610	#ifdef CONFIG_ACPI
	611	static const struct acpi_device_id silead_ts_acpi_match[] = {
	612	{ "GSL1680", 0 },
	613	{ "GSL1688", 0 },
	614	{ "GSL3670", 0 },
	615	{ "GSL3675", 0 },
	616	{ "GSL3692", 0 },
	617	{ "MSSL1680", 0 },
3993a163	618	{ "MSSL0001", 0 },
fc573af6	619	{ "MSSL0002", 0 },
3197704c RD	620	{ }
	621	};
	622	MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
	623	#endif
	624
483e55d9 JMC	625	#ifdef CONFIG_OF
	626	static const struct of_device_id silead_ts_of_match[] = {
	627	{ .compatible = "silead,gsl1680" },
	628	{ .compatible = "silead,gsl1688" },
	629	{ .compatible = "silead,gsl3670" },
	630	{ .compatible = "silead,gsl3675" },
	631	{ .compatible = "silead,gsl3692" },
	632	{ },
	633	};
	634	MODULE_DEVICE_TABLE(of, silead_ts_of_match);
	635	#endif
	636
3197704c RD	637	static struct i2c_driver silead_ts_driver = {
	638	.probe = silead_ts_probe,
	639	.id_table = silead_ts_id,
	640	.driver = {
	641	.name = SILEAD_TS_NAME,
	642	.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
483e55d9	643	.of_match_table = of_match_ptr(silead_ts_of_match),
3197704c RD	644	.pm = &silead_ts_pm,
	645	},
	646	};
	647	module_i2c_driver(silead_ts_driver);
	648
	649	MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
	650	MODULE_DESCRIPTION("Silead I2C touchscreen driver");
	651	MODULE_LICENSE("GPL");