drivers/input/touchscreen/ft5x06_ts.c

/*
 *
 * FocalTech ft5x06 TouchScreen driver.
 *
 * Copyright (c) 2010  Focal tech Ltd.
 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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/input.h>
#include <linux/input/mt.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/firmware.h>
#include <linux/debugfs.h>
#include <linux/input/ft5x06_ts.h>

#if defined(CONFIG_FB)
#include <linux/notifier.h>
#include <linux/fb.h>

#elif defined(CONFIG_HAS_EARLYSUSPEND)
#include <linux/earlysuspend.h>
/* Early-suspend level */
#define FT_SUSPEND_LEVEL 1
#endif

#define FT_DRIVER_VERSION	0x02

#define FT_META_REGS		3
#define FT_ONE_TCH_LEN		6
#define FT_TCH_LEN(x)		(FT_META_REGS + FT_ONE_TCH_LEN * x)

#define FT_PRESS		0x7F
#define FT_MAX_ID		0x0F
#define FT_TOUCH_X_H_POS	3
#define FT_TOUCH_X_L_POS	4
#define FT_TOUCH_Y_H_POS	5
#define FT_TOUCH_Y_L_POS	6
#define FT_TD_STATUS		2
#define FT_TOUCH_EVENT_POS	3
#define FT_TOUCH_ID_POS		5
#define FT_TOUCH_DOWN		0
#define FT_TOUCH_CONTACT	2

/*register address*/
#define FT_REG_DEV_MODE		0x00
#define FT_DEV_MODE_REG_CAL	0x02
#define FT_REG_ID		0xA3
#define FT_REG_PMODE		0xA5
#define FT_REG_FW_VER		0xA6
#define FT_REG_POINT_RATE	0x88
#define FT_REG_THGROUP		0x80
#define FT_REG_ECC		0xCC
#define FT_REG_RESET_FW		0x07
#define FT_REG_FW_MAJ_VER	0xB1
#define FT_REG_FW_MIN_VER	0xB2
#define FT_REG_FW_SUB_MIN_VER	0xB3

/* power register bits*/
#define FT_PMODE_ACTIVE		0x00
#define FT_PMODE_MONITOR	0x01
#define FT_PMODE_STANDBY	0x02
#define FT_PMODE_HIBERNATE	0x03
#define FT_FACTORYMODE_VALUE	0x40
#define FT_WORKMODE_VALUE	0x00
#define FT_RST_CMD_REG1		0xFC
#define FT_RST_CMD_REG2		0xBC
#define FT_READ_ID_REG		0x90
#define FT_ERASE_APP_REG	0x61
#define FT_ERASE_PANEL_REG	0x63
#define FT_FW_START_REG		0xBF

#define FT_STATUS_NUM_TP_MASK	0x0F

#define FT_VTG_MIN_UV		2600000
#define FT_VTG_MAX_UV		3300000
#define FT_I2C_VTG_MIN_UV	1800000
#define FT_I2C_VTG_MAX_UV	1800000

#define FT_COORDS_ARR_SIZE	4
#define MAX_BUTTONS		4

#define FT_8BIT_SHIFT		8
#define FT_4BIT_SHIFT		4
#define FT_FW_NAME_MAX_LEN	50

#define FT5316_ID		0x0A
#define FT5306I_ID		0x55
#define FT6X06_ID		0x06

#define FT_UPGRADE_AA		0xAA
#define FT_UPGRADE_55		0x55

#define FT_FW_MIN_SIZE		8
#define FT_FW_MAX_SIZE		32768

/* Firmware file is not supporting minor and sub minor so use 0 */
#define FT_FW_FILE_MAJ_VER(x)	((x)->data[(x)->size - 2])
#define FT_FW_FILE_MIN_VER(x)	0
#define FT_FW_FILE_SUB_MIN_VER(x) 0

#define FT_FW_CHECK(x)		\
	(((x)->data[(x)->size - 8] ^ (x)->data[(x)->size - 6]) == 0xFF \
	&& (((x)->data[(x)->size - 7] ^ (x)->data[(x)->size - 5]) == 0xFF \
	&& (((x)->data[(x)->size - 3] ^ (x)->data[(x)->size - 4]) == 0xFF)))

#define FT_MAX_TRIES		5
#define FT_RETRY_DLY		20

#define FT_MAX_WR_BUF		10
#define FT_MAX_RD_BUF		2
#define FT_FW_PKT_LEN		128
#define FT_FW_PKT_META_LEN	6
#define FT_FW_PKT_DLY_MS	20
#define FT_FW_LAST_PKT		0x6ffa
#define FT_EARSE_DLY_MS		100

#define FT_UPGRADE_LOOP		10
#define FT_CAL_START		0x04
#define FT_CAL_FIN		0x00
#define FT_CAL_STORE		0x05
#define FT_CAL_RETRY		100
#define FT_REG_CAL		0x00
#define FT_CAL_MASK		0x70

#define FT_INFO_MAX_LEN		512

#define FT_STORE_TS_INFO(buf, id, name, max_tch, group_id, fw_vkey_support, \
			fw_name, fw_maj, fw_min, fw_sub_min) \
			snprintf(buf, FT_INFO_MAX_LEN, \
				"controller\t= focaltech\n" \
				"model\t\t= 0x%x\n" \
				"name\t\t= %s\n" \
				"max_touches\t= %d\n" \
				"drv_ver\t\t= 0x%x\n" \
				"group_id\t= 0x%x\n" \
				"fw_vkey_support\t= %s\n" \
				"fw_name\t\t= %s\n" \
				"fw_ver\t\t= %d.%d.%d\n", id, name, \
				max_tch, FT_DRIVER_VERSION, group_id, \
				fw_vkey_support, fw_name, fw_maj, fw_min, \
				fw_sub_min)

#define FT_DEBUG_DIR_NAME	"ts_debug"

struct ft5x06_ts_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	const struct ft5x06_ts_platform_data *pdata;
	struct regulator *vdd;
	struct regulator *vcc_i2c;
	char fw_name[FT_FW_NAME_MAX_LEN];
	bool loading_fw;
	u8 family_id;
	struct dentry *dir;
	u16 addr;
	bool suspended;
	char *ts_info;
	u8 *tch_data;
	u32 tch_data_len;
	u8 fw_ver[3];
#if defined(CONFIG_FB)
	struct notifier_block fb_notif;
#elif defined(CONFIG_HAS_EARLYSUSPEND)
	struct early_suspend early_suspend;
#endif
};

static int ft5x06_i2c_read(struct i2c_client *client, char *writebuf,
			   int writelen, char *readbuf, int readlen)
{
	int ret;

	if (writelen > 0) {
		struct i2c_msg msgs[] = {
			{
				 .addr = client->addr,
				 .flags = 0,
				 .len = writelen,
				 .buf = writebuf,
			 },
			{
				 .addr = client->addr,
				 .flags = I2C_M_RD,
				 .len = readlen,
				 .buf = readbuf,
			 },
		};
		ret = i2c_transfer(client->adapter, msgs, 2);
		if (ret < 0)
			dev_err(&client->dev, "%s: i2c read error.\n",
				__func__);
	} else {
		struct i2c_msg msgs[] = {
			{
				 .addr = client->addr,
				 .flags = I2C_M_RD,
				 .len = readlen,
				 .buf = readbuf,
			 },
		};
		ret = i2c_transfer(client->adapter, msgs, 1);
		if (ret < 0)
			dev_err(&client->dev, "%s:i2c read error.\n", __func__);
	}
	return ret;
}

static int ft5x06_i2c_write(struct i2c_client *client, char *writebuf,
			    int writelen)
{
	int ret;

	struct i2c_msg msgs[] = {
		{
			 .addr = client->addr,
			 .flags = 0,
			 .len = writelen,
			 .buf = writebuf,
		 },
	};
	ret = i2c_transfer(client->adapter, msgs, 1);
	if (ret < 0)
		dev_err(&client->dev, "%s: i2c write error.\n", __func__);

	return ret;
}

static int ft5x0x_write_reg(struct i2c_client *client, u8 addr, const u8 val)
{
	u8 buf[2] = {0};

	buf[0] = addr;
	buf[1] = val;

	return ft5x06_i2c_write(client, buf, sizeof(buf));
}

static int ft5x0x_read_reg(struct i2c_client *client, u8 addr, u8 *val)
{
	return ft5x06_i2c_read(client, &addr, 1, val, 1);
}

static void ft5x06_update_fw_ver(struct ft5x06_ts_data *data)
{
	struct i2c_client *client = data->client;
	u8 reg_addr;
	int err;

	reg_addr = FT_REG_FW_MAJ_VER;
	err = ft5x06_i2c_read(client, &reg_addr, 1, &data->fw_ver[0], 1);
	if (err < 0)
		dev_err(&client->dev, "fw major version read failed");

	reg_addr = FT_REG_FW_MIN_VER;
	err = ft5x06_i2c_read(client, &reg_addr, 1, &data->fw_ver[1], 1);
	if (err < 0)
		dev_err(&client->dev, "fw minor version read failed");

	reg_addr = FT_REG_FW_SUB_MIN_VER;
	err = ft5x06_i2c_read(client, &reg_addr, 1, &data->fw_ver[2], 1);
	if (err < 0)
		dev_err(&client->dev, "fw sub minor version read failed");

	dev_info(&client->dev, "Firmware version = %d.%d.%d\n",
		data->fw_ver[0], data->fw_ver[1], data->fw_ver[2]);
}

static irqreturn_t ft5x06_ts_interrupt(int irq, void *dev_id)
{
	struct ft5x06_ts_data *data = dev_id;
	struct input_dev *ip_dev;
	int rc, i;
	u32 id, x, y, pressure, status, num_touches;
	u8 reg = 0x00, *buf;
	bool update_input = false;

	if (!data) {
		pr_err("%s: Invalid data\n", __func__);
		return IRQ_HANDLED;
	}

	ip_dev = data->input_dev;
	buf = data->tch_data;

	rc = ft5x06_i2c_read(data->client, &reg, 1,
			buf, data->tch_data_len);
	if (rc < 0) {
		dev_err(&data->client->dev, "%s: read data fail\n", __func__);
		return IRQ_HANDLED;
	}

	for (i = 0; i < data->pdata->num_max_touches; i++) {
		id = (buf[FT_TOUCH_ID_POS + FT_ONE_TCH_LEN * i]) >> 4;
		if (id >= FT_MAX_ID)
			break;

		update_input = true;

		x = (buf[FT_TOUCH_X_H_POS + FT_ONE_TCH_LEN * i] & 0x0F) << 8 |
			(buf[FT_TOUCH_X_L_POS + FT_ONE_TCH_LEN * i]);
		y = (buf[FT_TOUCH_Y_H_POS + FT_ONE_TCH_LEN * i] & 0x0F) << 8 |
			(buf[FT_TOUCH_Y_L_POS + FT_ONE_TCH_LEN * i]);

		status = buf[FT_TOUCH_EVENT_POS + FT_ONE_TCH_LEN * i] >> 6;

		num_touches = buf[FT_TD_STATUS] & FT_STATUS_NUM_TP_MASK;

		/* invalid combination */
		if (!num_touches && !status && !id)
			break;

		input_mt_slot(ip_dev, id);
		if (status == FT_TOUCH_DOWN || status == FT_TOUCH_CONTACT) {
			pressure = FT_PRESS;
			input_mt_report_slot_state(ip_dev, MT_TOOL_FINGER, 1);
			input_report_abs(ip_dev, ABS_MT_POSITION_X, x);
			input_report_abs(ip_dev, ABS_MT_POSITION_Y, y);
			input_report_abs(ip_dev, ABS_MT_PRESSURE, pressure);
		} else {
			input_mt_report_slot_state(ip_dev, MT_TOOL_FINGER, 0);
			input_report_abs(ip_dev, ABS_MT_PRESSURE, 0);
		}
	}

	if (update_input) {
		input_mt_report_pointer_emulation(ip_dev, false);
		input_sync(ip_dev);
	}

	return IRQ_HANDLED;
}

static int ft5x06_power_on(struct ft5x06_ts_data *data, bool on)
{
	int rc;

	if (!on)
		goto power_off;

	rc = regulator_enable(data->vdd);
	if (rc) {
		dev_err(&data->client->dev,
			"Regulator vdd enable failed rc=%d\n", rc);
		return rc;
	}

	rc = regulator_enable(data->vcc_i2c);
	if (rc) {
		dev_err(&data->client->dev,
			"Regulator vcc_i2c enable failed rc=%d\n", rc);
		regulator_disable(data->vdd);
	}

	return rc;

power_off:
	rc = regulator_disable(data->vdd);
	if (rc) {
		dev_err(&data->client->dev,
			"Regulator vdd disable failed rc=%d\n", rc);
		return rc;
	}

	rc = regulator_disable(data->vcc_i2c);
	if (rc) {
		dev_err(&data->client->dev,
			"Regulator vcc_i2c disable failed rc=%d\n", rc);
		regulator_enable(data->vdd);
	}

	return rc;
}

static int ft5x06_power_init(struct ft5x06_ts_data *data, bool on)
{
	int rc;

	if (!on)
		goto pwr_deinit;

	data->vdd = regulator_get(&data->client->dev, "vdd");
	if (IS_ERR(data->vdd)) {
		rc = PTR_ERR(data->vdd);
		dev_err(&data->client->dev,
			"Regulator get failed vdd rc=%d\n", rc);
		return rc;
	}

	if (regulator_count_voltages(data->vdd) > 0) {
		rc = regulator_set_voltage(data->vdd, FT_VTG_MIN_UV,
					   FT_VTG_MAX_UV);
		if (rc) {
			dev_err(&data->client->dev,
				"Regulator set_vtg failed vdd rc=%d\n", rc);
			goto reg_vdd_put;
		}
	}

	data->vcc_i2c = regulator_get(&data->client->dev, "vcc_i2c");
	if (IS_ERR(data->vcc_i2c)) {
		rc = PTR_ERR(data->vcc_i2c);
		dev_err(&data->client->dev,
			"Regulator get failed vcc_i2c rc=%d\n", rc);
		goto reg_vdd_set_vtg;
	}

	if (regulator_count_voltages(data->vcc_i2c) > 0) {
		rc = regulator_set_voltage(data->vcc_i2c, FT_I2C_VTG_MIN_UV,
					   FT_I2C_VTG_MAX_UV);
		if (rc) {
			dev_err(&data->client->dev,
			"Regulator set_vtg failed vcc_i2c rc=%d\n", rc);
			goto reg_vcc_i2c_put;
		}
	}

	return 0;

reg_vcc_i2c_put:
	regulator_put(data->vcc_i2c);
reg_vdd_set_vtg:
	if (regulator_count_voltages(data->vdd) > 0)
		regulator_set_voltage(data->vdd, 0, FT_VTG_MAX_UV);
reg_vdd_put:
	regulator_put(data->vdd);
	return rc;

pwr_deinit:
	if (regulator_count_voltages(data->vdd) > 0)
		regulator_set_voltage(data->vdd, 0, FT_VTG_MAX_UV);

	regulator_put(data->vdd);

	if (regulator_count_voltages(data->vcc_i2c) > 0)
		regulator_set_voltage(data->vcc_i2c, 0, FT_I2C_VTG_MAX_UV);

	regulator_put(data->vcc_i2c);
	return 0;
}

#ifdef CONFIG_PM
static int ft5x06_ts_suspend(struct device *dev)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	char txbuf[2], i;
	int err;

	if (data->loading_fw) {
		dev_info(dev, "Firmware loading in process...\n");
		return 0;
	}

	if (data->suspended) {
		dev_info(dev, "Already in suspend state\n");
		return 0;
	}

	disable_irq(data->client->irq);

	/* release all touches */
	for (i = 0; i < data->pdata->num_max_touches; i++) {
		input_mt_slot(data->input_dev, i);
		input_mt_report_slot_state(data->input_dev, MT_TOOL_FINGER, 0);
	}
	input_report_key(data->input_dev, BTN_TOUCH, 0);
	input_sync(data->input_dev);

	if (gpio_is_valid(data->pdata->reset_gpio)) {
		txbuf[0] = FT_REG_PMODE;
		txbuf[1] = FT_PMODE_HIBERNATE;
		ft5x06_i2c_write(data->client, txbuf, sizeof(txbuf));
	}

	if (data->pdata->power_on) {
		err = data->pdata->power_on(false);
		if (err) {
			dev_err(dev, "power off failed");
			goto pwr_off_fail;
		}
	} else {
		err = ft5x06_power_on(data, false);
		if (err) {
			dev_err(dev, "power off failed");
			goto pwr_off_fail;
		}
	}

	data->suspended = true;

	return 0;

pwr_off_fail:
	if (gpio_is_valid(data->pdata->reset_gpio)) {
		gpio_set_value_cansleep(data->pdata->reset_gpio, 0);
		msleep(data->pdata->hard_rst_dly);
		gpio_set_value_cansleep(data->pdata->reset_gpio, 1);
	}
	enable_irq(data->client->irq);
	return err;
}

static int ft5x06_ts_resume(struct device *dev)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	int err;

	if (!data->suspended) {
		dev_dbg(dev, "Already in awake state\n");
		return 0;
	}

	if (data->pdata->power_on) {
		err = data->pdata->power_on(true);
		if (err) {
			dev_err(dev, "power on failed");
			return err;
		}
	} else {
		err = ft5x06_power_on(data, true);
		if (err) {
			dev_err(dev, "power on failed");
			return err;
		}
	}

	if (gpio_is_valid(data->pdata->reset_gpio)) {
		gpio_set_value_cansleep(data->pdata->reset_gpio, 0);
		msleep(data->pdata->hard_rst_dly);
		gpio_set_value_cansleep(data->pdata->reset_gpio, 1);
	}

	msleep(data->pdata->soft_rst_dly);

	enable_irq(data->client->irq);

	data->suspended = false;

	return 0;
}

#if defined(CONFIG_FB)
static int fb_notifier_callback(struct notifier_block *self,
				 unsigned long event, void *data)
{
	struct fb_event *evdata = data;
	int *blank;
	struct ft5x06_ts_data *ft5x06_data =
		container_of(self, struct ft5x06_ts_data, fb_notif);

	if (evdata && evdata->data && event == FB_EVENT_BLANK &&
			ft5x06_data && ft5x06_data->client) {
		blank = evdata->data;
		if (*blank == FB_BLANK_UNBLANK)
			ft5x06_ts_resume(&ft5x06_data->client->dev);
		else if (*blank == FB_BLANK_POWERDOWN)
			ft5x06_ts_suspend(&ft5x06_data->client->dev);
	}

	return 0;
}
#elif defined(CONFIG_HAS_EARLYSUSPEND)
static void ft5x06_ts_early_suspend(struct early_suspend *handler)
{
	struct ft5x06_ts_data *data = container_of(handler,
						   struct ft5x06_ts_data,
						   early_suspend);

	ft5x06_ts_suspend(&data->client->dev);
}

static void ft5x06_ts_late_resume(struct early_suspend *handler)
{
	struct ft5x06_ts_data *data = container_of(handler,
						   struct ft5x06_ts_data,
						   early_suspend);

	ft5x06_ts_resume(&data->client->dev);
}
#endif

static const struct dev_pm_ops ft5x06_ts_pm_ops = {
#if (!defined(CONFIG_FB) && !defined(CONFIG_HAS_EARLYSUSPEND))
	.suspend = ft5x06_ts_suspend,
	.resume = ft5x06_ts_resume,
#endif
};
#endif

static int ft5x06_auto_cal(struct i2c_client *client)
{
	struct ft5x06_ts_data *data = i2c_get_clientdata(client);
	u8 temp = 0, i;

	/* set to factory mode */
	msleep(2 * data->pdata->soft_rst_dly);
	ft5x0x_write_reg(client, FT_REG_DEV_MODE, FT_FACTORYMODE_VALUE);
	msleep(data->pdata->soft_rst_dly);

	/* start calibration */
	ft5x0x_write_reg(client, FT_DEV_MODE_REG_CAL, FT_CAL_START);
	msleep(2 * data->pdata->soft_rst_dly);
	for (i = 0; i < FT_CAL_RETRY; i++) {
		ft5x0x_read_reg(client, FT_REG_CAL, &temp);
		/*return to normal mode, calibration finish */
		if (((temp & FT_CAL_MASK) >> FT_4BIT_SHIFT) == FT_CAL_FIN)
			break;
	}

	/*calibration OK */
	msleep(2 * data->pdata->soft_rst_dly);
	ft5x0x_write_reg(client, FT_REG_DEV_MODE, FT_FACTORYMODE_VALUE);
	msleep(data->pdata->soft_rst_dly);

	/* store calibration data */
	ft5x0x_write_reg(client, FT_DEV_MODE_REG_CAL, FT_CAL_STORE);
	msleep(2 * data->pdata->soft_rst_dly);

	/* set to normal mode */
	ft5x0x_write_reg(client, FT_REG_DEV_MODE, FT_WORKMODE_VALUE);
	msleep(2 * data->pdata->soft_rst_dly);

	return 0;
}

static int ft5x06_fw_upgrade_start(struct i2c_client *client,
			const u8 *data, u32 data_len)
{
	struct ft5x06_ts_data *ts_data = i2c_get_clientdata(client);
	struct fw_upgrade_info info = ts_data->pdata->info;
	u8 reset_reg;
	u8 w_buf[FT_MAX_WR_BUF] = {0}, r_buf[FT_MAX_RD_BUF] = {0};
	u8 pkt_buf[FT_FW_PKT_LEN + FT_FW_PKT_META_LEN];
	int rc, i, j, temp;
	u32 pkt_num, pkt_len;
	u8 fw_ecc;

	for (i = 0, j = 0; i < FT_UPGRADE_LOOP; i++) {
		/* reset - write 0xaa and 0x55 to reset register */
		if (ts_data->family_id == FT6X06_ID)
			reset_reg = FT_RST_CMD_REG2;
		else
			reset_reg = FT_RST_CMD_REG1;

		ft5x0x_write_reg(client, reset_reg, FT_UPGRADE_AA);
		msleep(info.delay_aa);

		ft5x0x_write_reg(client, reset_reg, FT_UPGRADE_55);
		msleep(info.delay_55);

		/* Enter upgrade mode */
		w_buf[0] = FT_UPGRADE_55;
		w_buf[1] = FT_UPGRADE_AA;
		do {
			j++;
			rc = ft5x06_i2c_write(client, w_buf, 2);
			msleep(FT_RETRY_DLY);
		} while (rc <= 0 && j < FT_MAX_TRIES);

		/* check READ_ID */
		msleep(info.delay_readid);
		w_buf[0] = FT_READ_ID_REG;
		w_buf[1] = 0x00;
		w_buf[2] = 0x00;
		w_buf[3] = 0x00;

		ft5x06_i2c_read(client, w_buf, 4, r_buf, 2);

		if (r_buf[0] != info.upgrade_id_1
			|| r_buf[1] != info.upgrade_id_2) {
			dev_err(&client->dev, "Upgrade ID mismatch(%d)\n", i);
		} else
			break;
	}

	if (i >= FT_UPGRADE_LOOP) {
		dev_err(&client->dev, "Abort upgrade\n");
		return -EIO;
	}

	/* erase app and panel paramenter area */
	w_buf[0] = FT_ERASE_APP_REG;
	ft5x06_i2c_write(client, w_buf, 1);
	msleep(info.delay_erase_flash);

	w_buf[0] = FT_ERASE_PANEL_REG;
	ft5x06_i2c_write(client, w_buf, 1);
	msleep(FT_EARSE_DLY_MS);

	/* program firmware */
	data_len = data_len - 8;
	pkt_num = (data_len) / FT_FW_PKT_LEN;
	pkt_len = FT_FW_PKT_LEN;
	pkt_buf[0] = FT_FW_START_REG;
	pkt_buf[1] = 0x00;
	fw_ecc = 0;

	for (i = 0; i < pkt_num; i++) {
		temp = i * FT_FW_PKT_LEN;
		pkt_buf[2] = (u8) (temp >> FT_8BIT_SHIFT);
		pkt_buf[3] = (u8) temp;
		pkt_buf[4] = (u8) (pkt_len >> FT_8BIT_SHIFT);
		pkt_buf[5] = (u8) pkt_len;

		for (j = 0; j < FT_FW_PKT_LEN; j++) {
			pkt_buf[6 + j] = data[i * FT_FW_PKT_LEN + j];
			fw_ecc ^= pkt_buf[6 + j];
		}

		ft5x06_i2c_write(client, pkt_buf,
				FT_FW_PKT_LEN + FT_FW_PKT_META_LEN);
		msleep(FT_FW_PKT_DLY_MS);
	}

	/* send remaining bytes */
	if ((data_len) % FT_FW_PKT_LEN > 0) {
		temp = pkt_num * FT_FW_PKT_LEN;
		pkt_buf[2] = (u8) (temp >> FT_8BIT_SHIFT);
		pkt_buf[3] = (u8) temp;
		temp = (data_len) % FT_FW_PKT_LEN;
		pkt_buf[4] = (u8) (temp >> FT_8BIT_SHIFT);
		pkt_buf[5] = (u8) temp;

		for (i = 0; i < temp; i++) {
			pkt_buf[6 + i] = data[pkt_num * FT_FW_PKT_LEN + i];
			fw_ecc ^= pkt_buf[6 + i];
		}

		ft5x06_i2c_write(client, pkt_buf, temp + FT_FW_PKT_META_LEN);
		msleep(FT_FW_PKT_DLY_MS);
	}

	/* send the finishing packet */
	for (i = 0; i < 6; i++) {
		temp = FT_FW_LAST_PKT + i;
		pkt_buf[2] = (u8) (temp >> 8);
		pkt_buf[3] = (u8) temp;
		temp = 1;
		pkt_buf[4] = (u8) (temp >> 8);
		pkt_buf[5] = (u8) temp;
		pkt_buf[6] = data[data_len + i];
		fw_ecc ^= pkt_buf[6];
		ft5x06_i2c_write(client, pkt_buf, temp + FT_FW_PKT_META_LEN);
		msleep(FT_FW_PKT_DLY_MS);
	}

	/* verify checksum */
	w_buf[0] = FT_REG_ECC;
	ft5x06_i2c_read(client, w_buf, 1, r_buf, 1);
	if (r_buf[0] != fw_ecc) {
		dev_err(&client->dev, "ECC error! dev_ecc=%02x fw_ecc=%02x\n",
					r_buf[0], fw_ecc);
		return -EIO;
	}

	/* reset */
	w_buf[0] = FT_REG_RESET_FW;
	ft5x06_i2c_write(client, w_buf, 1);
	msleep(ts_data->pdata->soft_rst_dly);

	dev_info(&client->dev, "Firmware upgrade successful\n");

	return 0;
}

static int ft5x06_fw_upgrade(struct device *dev, bool force)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	const struct firmware *fw = NULL;
	int rc;
	u8 fw_file_maj, fw_file_min, fw_file_sub_min;
	bool fw_upgrade = false;

	rc = request_firmware(&fw, data->fw_name, dev);
	if (rc < 0) {
		dev_err(dev, "Request firmware failed - %s (%d)\n",
						data->fw_name, rc);
		return rc;
	}

	if (fw->size < FT_FW_MIN_SIZE || fw->size > FT_FW_MAX_SIZE) {
		dev_err(dev, "Invalid firmware size (%d)\n", fw->size);
		rc = -EIO;
		goto rel_fw;
	}

	fw_file_maj = FT_FW_FILE_MAJ_VER(fw);
	fw_file_min = FT_FW_FILE_MIN_VER(fw);
	fw_file_sub_min = FT_FW_FILE_SUB_MIN_VER(fw);

	dev_info(dev, "Current firmware: %d.%d.%d", data->fw_ver[0],
				data->fw_ver[1], data->fw_ver[2]);
	dev_info(dev, "New firmware: %d.%d.%d", fw_file_maj,
				fw_file_min, fw_file_sub_min);

	if (force) {
		fw_upgrade = true;
	} else if (data->fw_ver[0] == fw_file_maj) {
			if (data->fw_ver[1] < fw_file_min)
				fw_upgrade = true;
			else if (data->fw_ver[2] < fw_file_sub_min)
				fw_upgrade = true;
			else
				dev_info(dev, "No need to upgrade\n");
	} else
		dev_info(dev, "Firmware versions do not match\n");

	if (!fw_upgrade) {
		dev_info(dev, "Exiting fw upgrade...\n");
		rc = -EFAULT;
		goto rel_fw;
	}

	/* start firmware upgrade */
	if (FT_FW_CHECK(fw)) {
		rc = ft5x06_fw_upgrade_start(data->client, fw->data, fw->size);
		if (rc < 0)
			dev_err(dev, "update failed (%d). try later...\n", rc);
		else if (data->pdata->info.auto_cal)
			ft5x06_auto_cal(data->client);
	} else {
		dev_err(dev, "FW format error\n");
		rc = -EIO;
	}

	ft5x06_update_fw_ver(data);

	FT_STORE_TS_INFO(data->ts_info, data->family_id, data->pdata->name,
			data->pdata->num_max_touches, data->pdata->group_id,
			data->pdata->fw_vkey_support ? "yes" : "no",
			data->pdata->fw_name, data->fw_ver[0],
			data->fw_ver[1], data->fw_ver[2]);
rel_fw:
	release_firmware(fw);
	return rc;
}

static ssize_t ft5x06_update_fw_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	return snprintf(buf, 2, "%d\n", data->loading_fw);
}

static ssize_t ft5x06_update_fw_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t size)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int rc;

	if (size > 2)
		return -EINVAL;

	rc = kstrtoul(buf, 10, &val);
	if (rc != 0)
		return rc;

	if (data->suspended) {
		dev_info(dev, "In suspend state, try again later...\n");
		return size;
	}

	mutex_lock(&data->input_dev->mutex);
	if (!data->loading_fw  && val) {
		data->loading_fw = true;
		ft5x06_fw_upgrade(dev, false);
		data->loading_fw = false;
	}
	mutex_unlock(&data->input_dev->mutex);

	return size;
}

static DEVICE_ATTR(update_fw, 0664, ft5x06_update_fw_show,
				ft5x06_update_fw_store);

static ssize_t ft5x06_force_update_fw_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t size)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int rc;

	if (size > 2)
		return -EINVAL;

	rc = kstrtoul(buf, 10, &val);
	if (rc != 0)
		return rc;

	mutex_lock(&data->input_dev->mutex);
	if (!data->loading_fw  && val) {
		data->loading_fw = true;
		ft5x06_fw_upgrade(dev, true);
		data->loading_fw = false;
	}
	mutex_unlock(&data->input_dev->mutex);

	return size;
}

static DEVICE_ATTR(force_update_fw, 0664, ft5x06_update_fw_show,
				ft5x06_force_update_fw_store);

static ssize_t ft5x06_fw_name_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);
	return snprintf(buf, FT_FW_NAME_MAX_LEN - 1, "%s\n", data->fw_name);
}

static ssize_t ft5x06_fw_name_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t size)
{
	struct ft5x06_ts_data *data = dev_get_drvdata(dev);

	if (size > FT_FW_NAME_MAX_LEN - 1)
		return -EINVAL;

	strlcpy(data->fw_name, buf, size);
	if (data->fw_name[size-1] == '\n')
		data->fw_name[size-1] = 0;

	return size;
}

static DEVICE_ATTR(fw_name, 0664, ft5x06_fw_name_show, ft5x06_fw_name_store);

static bool ft5x06_debug_addr_is_valid(int addr)
{
	if (addr < 0 || addr > 0xFF) {
		pr_err("FT reg address is invalid: 0x%x\n", addr);
		return false;
	}

	return true;
}

static int ft5x06_debug_data_set(void *_data, u64 val)
{
	struct ft5x06_ts_data *data = _data;

	mutex_lock(&data->input_dev->mutex);

	if (ft5x06_debug_addr_is_valid(data->addr))
		dev_info(&data->client->dev,
			"Writing into FT registers not supported\n");

	mutex_unlock(&data->input_dev->mutex);

	return 0;
}

static int ft5x06_debug_data_get(void *_data, u64 *val)
{
	struct ft5x06_ts_data *data = _data;
	int rc;
	u8 reg;

	mutex_lock(&data->input_dev->mutex);

	if (ft5x06_debug_addr_is_valid(data->addr)) {
		rc = ft5x0x_read_reg(data->client, data->addr, &reg);
		if (rc < 0)
			dev_err(&data->client->dev,
				"FT read register 0x%x failed (%d)\n",
				data->addr, rc);
		else
			*val = reg;
	}

	mutex_unlock(&data->input_dev->mutex);

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(debug_data_fops, ft5x06_debug_data_get,
			ft5x06_debug_data_set, "0x%02llX\n");

static int ft5x06_debug_addr_set(void *_data, u64 val)
{
	struct ft5x06_ts_data *data = _data;

	if (ft5x06_debug_addr_is_valid(val)) {
		mutex_lock(&data->input_dev->mutex);
		data->addr = val;
		mutex_unlock(&data->input_dev->mutex);
	}

	return 0;
}

static int ft5x06_debug_addr_get(void *_data, u64 *val)
{
	struct ft5x06_ts_data *data = _data;

	mutex_lock(&data->input_dev->mutex);

	if (ft5x06_debug_addr_is_valid(data->addr))
		*val = data->addr;

	mutex_unlock(&data->input_dev->mutex);

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(debug_addr_fops, ft5x06_debug_addr_get,
			ft5x06_debug_addr_set, "0x%02llX\n");

static int ft5x06_debug_suspend_set(void *_data, u64 val)
{
	struct ft5x06_ts_data *data = _data;

	mutex_lock(&data->input_dev->mutex);

	if (val)
		ft5x06_ts_suspend(&data->client->dev);
	else
		ft5x06_ts_resume(&data->client->dev);

	mutex_unlock(&data->input_dev->mutex);

	return 0;
}

static int ft5x06_debug_suspend_get(void *_data, u64 *val)
{
	struct ft5x06_ts_data *data = _data;

	mutex_lock(&data->input_dev->mutex);
	*val = data->suspended;
	mutex_unlock(&data->input_dev->mutex);

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(debug_suspend_fops, ft5x06_debug_suspend_get,
			ft5x06_debug_suspend_set, "%lld\n");

static int ft5x06_debug_dump_info(struct seq_file *m, void *v)
{
	struct ft5x06_ts_data *data = m->private;

	seq_printf(m, "%s\n", data->ts_info);

	return 0;
}

static int debugfs_dump_info_open(struct inode *inode, struct file *file)
{
	return single_open(file, ft5x06_debug_dump_info, inode->i_private);
}

static const struct file_operations debug_dump_info_fops = {
	.owner		= THIS_MODULE,
	.open		= debugfs_dump_info_open,
	.read		= seq_read,
	.release	= single_release,
};

#ifdef CONFIG_OF
static int ft5x06_get_dt_coords(struct device *dev, char *name,
				struct ft5x06_ts_platform_data *pdata)
{
	u32 coords[FT_COORDS_ARR_SIZE];
	struct property *prop;
	struct device_node *np = dev->of_node;
	int coords_size, rc;

	prop = of_find_property(np, name, NULL);
	if (!prop)
		return -EINVAL;
	if (!prop->value)
		return -ENODATA;

	coords_size = prop->length / sizeof(u32);
	if (coords_size != FT_COORDS_ARR_SIZE) {
		dev_err(dev, "invalid %s\n", name);
		return -EINVAL;
	}

	rc = of_property_read_u32_array(np, name, coords, coords_size);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read %s\n", name);
		return rc;
	}

	if (!strcmp(name, "focaltech,panel-coords")) {
		pdata->panel_minx = coords[0];
		pdata->panel_miny = coords[1];
		pdata->panel_maxx = coords[2];
		pdata->panel_maxy = coords[3];
	} else if (!strcmp(name, "focaltech,display-coords")) {
		pdata->x_min = coords[0];
		pdata->y_min = coords[1];
		pdata->x_max = coords[2];
		pdata->y_max = coords[3];
	} else {
		dev_err(dev, "unsupported property %s\n", name);
		return -EINVAL;
	}

	return 0;
}

static int ft5x06_parse_dt(struct device *dev,
			struct ft5x06_ts_platform_data *pdata)
{
	int rc;
	struct device_node *np = dev->of_node;
	struct property *prop;
	u32 temp_val, num_buttons;
	u32 button_map[MAX_BUTTONS];

	pdata->name = "focaltech";
	rc = of_property_read_string(np, "focaltech,name", &pdata->name);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read name\n");
		return rc;
	}

	rc = ft5x06_get_dt_coords(dev, "focaltech,panel-coords", pdata);
	if (rc && (rc != -EINVAL))
		return rc;

	rc = ft5x06_get_dt_coords(dev, "focaltech,display-coords", pdata);
	if (rc)
		return rc;

	pdata->i2c_pull_up = of_property_read_bool(np,
						"focaltech,i2c-pull-up");

	pdata->no_force_update = of_property_read_bool(np,
						"focaltech,no-force-update");
	/* reset, irq gpio info */
	pdata->reset_gpio = of_get_named_gpio_flags(np, "focaltech,reset-gpio",
				0, &pdata->reset_gpio_flags);
	if (pdata->reset_gpio < 0)
		return pdata->reset_gpio;

	pdata->irq_gpio = of_get_named_gpio_flags(np, "focaltech,irq-gpio",
				0, &pdata->irq_gpio_flags);
	if (pdata->irq_gpio < 0)
		return pdata->irq_gpio;

	pdata->fw_name = "ft_fw.bin";
	rc = of_property_read_string(np, "focaltech,fw-name", &pdata->fw_name);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw name\n");
		return rc;
	}

	rc = of_property_read_u32(np, "focaltech,group-id", &temp_val);
	if (!rc)
		pdata->group_id = temp_val;
	else
		return rc;

	rc = of_property_read_u32(np, "focaltech,hard-reset-delay-ms",
							&temp_val);
	if (!rc)
		pdata->hard_rst_dly = temp_val;
	else
		return rc;

	rc = of_property_read_u32(np, "focaltech,soft-reset-delay-ms",
							&temp_val);
	if (!rc)
		pdata->soft_rst_dly = temp_val;
	else
		return rc;

	rc = of_property_read_u32(np, "focaltech,num-max-touches", &temp_val);
	if (!rc)
		pdata->num_max_touches = temp_val;
	else
		return rc;

	rc = of_property_read_u32(np, "focaltech,fw-delay-aa-ms", &temp_val);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw delay aa\n");
		return rc;
	} else if (rc != -EINVAL)
		pdata->info.delay_aa =  temp_val;

	rc = of_property_read_u32(np, "focaltech,fw-delay-55-ms", &temp_val);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw delay 55\n");
		return rc;
	} else if (rc != -EINVAL)
		pdata->info.delay_55 =  temp_val;

	rc = of_property_read_u32(np, "focaltech,fw-upgrade-id1", &temp_val);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw upgrade id1\n");
		return rc;
	} else if (rc != -EINVAL)
		pdata->info.upgrade_id_1 =  temp_val;

	rc = of_property_read_u32(np, "focaltech,fw-upgrade-id2", &temp_val);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw upgrade id2\n");
		return rc;
	} else if (rc != -EINVAL)
		pdata->info.upgrade_id_2 =  temp_val;

	rc = of_property_read_u32(np, "focaltech,fw-delay-readid-ms",
							&temp_val);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw delay read id\n");
		return rc;
	} else if (rc != -EINVAL)
		pdata->info.delay_readid =  temp_val;

	rc = of_property_read_u32(np, "focaltech,fw-delay-era-flsh-ms",
							&temp_val);
	if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read fw delay erase flash\n");
		return rc;
	} else if (rc != -EINVAL)
		pdata->info.delay_erase_flash =  temp_val;

	pdata->info.auto_cal = of_property_read_bool(np,
					"focaltech,fw-auto-cal");

	pdata->fw_vkey_support = of_property_read_bool(np,
						"focaltech,fw-vkey-support");

	rc = of_property_read_u32(np, "focaltech,family-id", &temp_val);
	if (!rc)
		pdata->family_id = temp_val;
	else
		return rc;

	prop = of_find_property(np, "focaltech,button-map", NULL);
	if (prop) {
		num_buttons = prop->length / sizeof(temp_val);
		if (num_buttons > MAX_BUTTONS)
			return -EINVAL;

		rc = of_property_read_u32_array(np,
			"focaltech,button-map", button_map,
			num_buttons);
		if (rc) {
			dev_err(dev, "Unable to read key codes\n");
			return rc;
		}
	}

	return 0;
}
#else
static int ft5x06_parse_dt(struct device *dev,
			struct ft5x06_ts_platform_data *pdata)
{
	return -ENODEV;
}
#endif

static int ft5x06_ts_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct ft5x06_ts_platform_data *pdata;
	struct ft5x06_ts_data *data;
	struct input_dev *input_dev;
	struct dentry *temp;
	u8 reg_value;
	u8 reg_addr;
	int err, len;

	if (client->dev.of_node) {
		pdata = devm_kzalloc(&client->dev,
			sizeof(struct ft5x06_ts_platform_data), GFP_KERNEL);
		if (!pdata) {
			dev_err(&client->dev, "Failed to allocate memory\n");
			return -ENOMEM;
		}

		err = ft5x06_parse_dt(&client->dev, pdata);
		if (err) {
			dev_err(&client->dev, "DT parsing failed\n");
			return err;
		}
	} else
		pdata = client->dev.platform_data;

	if (!pdata) {
		dev_err(&client->dev, "Invalid pdata\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "I2C not supported\n");
		return -ENODEV;
	}

	data = devm_kzalloc(&client->dev,
			sizeof(struct ft5x06_ts_data), GFP_KERNEL);
	if (!data) {
		dev_err(&client->dev, "Not enough memory\n");
		return -ENOMEM;
	}

	if (pdata->fw_name) {
		len = strlen(pdata->fw_name);
		if (len > FT_FW_NAME_MAX_LEN - 1) {
			dev_err(&client->dev, "Invalid firmware name\n");
			return -EINVAL;
		}

		strlcpy(data->fw_name, pdata->fw_name, len + 1);
	}

	data->tch_data_len = FT_TCH_LEN(pdata->num_max_touches);
	data->tch_data = devm_kzalloc(&client->dev,
				data->tch_data_len, GFP_KERNEL);
	if (!data) {
		dev_err(&client->dev, "Not enough memory\n");
		return -ENOMEM;
	}

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

	data->input_dev = input_dev;
	data->client = client;
	data->pdata = pdata;

	input_dev->name = "ft5x06_ts";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	input_set_drvdata(input_dev, data);
	i2c_set_clientdata(client, data);

	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(EV_ABS, input_dev->evbit);
	__set_bit(BTN_TOUCH, input_dev->keybit);
	__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);

	input_mt_init_slots(input_dev, pdata->num_max_touches);
	input_set_abs_params(input_dev, ABS_MT_POSITION_X, pdata->x_min,
			     pdata->x_max, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, pdata->y_min,
			     pdata->y_max, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, FT_PRESS, 0, 0);

	err = input_register_device(input_dev);
	if (err) {
		dev_err(&client->dev, "Input device registration failed\n");
		goto free_inputdev;
	}

	if (pdata->power_init) {
		err = pdata->power_init(true);
		if (err) {
			dev_err(&client->dev, "power init failed");
			goto unreg_inputdev;
		}
	} else {
		err = ft5x06_power_init(data, true);
		if (err) {
			dev_err(&client->dev, "power init failed");
			goto unreg_inputdev;
		}
	}

	if (pdata->power_on) {
		err = pdata->power_on(true);
		if (err) {
			dev_err(&client->dev, "power on failed");
			goto pwr_deinit;
		}
	} else {
		err = ft5x06_power_on(data, true);
		if (err) {
			dev_err(&client->dev, "power on failed");
			goto pwr_deinit;
		}
	}

	if (gpio_is_valid(pdata->irq_gpio)) {
		err = gpio_request(pdata->irq_gpio, "ft5x06_irq_gpio");
		if (err) {
			dev_err(&client->dev, "irq gpio request failed");
			goto pwr_off;
		}
		err = gpio_direction_input(pdata->irq_gpio);
		if (err) {
			dev_err(&client->dev,
				"set_direction for irq gpio failed\n");
			goto free_irq_gpio;
		}
	}

	if (gpio_is_valid(pdata->reset_gpio)) {
		err = gpio_request(pdata->reset_gpio, "ft5x06_reset_gpio");
		if (err) {
			dev_err(&client->dev, "reset gpio request failed");
			goto free_irq_gpio;
		}

		err = gpio_direction_output(pdata->reset_gpio, 0);
		if (err) {
			dev_err(&client->dev,
				"set_direction for reset gpio failed\n");
			goto free_reset_gpio;
		}
		msleep(data->pdata->hard_rst_dly);
		gpio_set_value_cansleep(data->pdata->reset_gpio, 1);
	}

	/* make sure CTP already finish startup process */
	msleep(data->pdata->soft_rst_dly);

	/* check the controller id */
	reg_addr = FT_REG_ID;
	err = ft5x06_i2c_read(client, &reg_addr, 1, &reg_value, 1);
	if (err < 0) {
		dev_err(&client->dev, "version read failed");
		goto free_reset_gpio;
	}

	dev_info(&client->dev, "Device ID = 0x%x\n", reg_value);

	if (pdata->family_id != reg_value) {
		dev_err(&client->dev, "%s:Unsupported controller\n", __func__);
		goto free_reset_gpio;
	}

	data->family_id = reg_value;

	err = request_threaded_irq(client->irq, NULL,
				   ft5x06_ts_interrupt, pdata->irqflags,
				   client->dev.driver->name, data);
	if (err) {
		dev_err(&client->dev, "request irq failed\n");
		goto free_reset_gpio;
	}

	err = device_create_file(&client->dev, &dev_attr_fw_name);
	if (err) {
		dev_err(&client->dev, "sys file creation failed\n");
		goto irq_free;
	}

	err = device_create_file(&client->dev, &dev_attr_update_fw);
	if (err) {
		dev_err(&client->dev, "sys file creation failed\n");
		goto free_fw_name_sys;
	}

	err = device_create_file(&client->dev, &dev_attr_force_update_fw);
	if (err) {
		dev_err(&client->dev, "sys file creation failed\n");
		goto free_update_fw_sys;
	}

	data->dir = debugfs_create_dir(FT_DEBUG_DIR_NAME, NULL);
	if (data->dir == NULL || IS_ERR(data->dir)) {
		pr_err("debugfs_create_dir failed(%ld)\n", PTR_ERR(data->dir));
		err = PTR_ERR(data->dir);
		goto free_force_update_fw_sys;
	}

	temp = debugfs_create_file("addr", S_IRUSR | S_IWUSR, data->dir, data,
				   &debug_addr_fops);
	if (temp == NULL || IS_ERR(temp)) {
		pr_err("debugfs_create_file failed: rc=%ld\n", PTR_ERR(temp));
		err = PTR_ERR(temp);
		goto free_debug_dir;
	}

	temp = debugfs_create_file("data", S_IRUSR | S_IWUSR, data->dir, data,
				   &debug_data_fops);
	if (temp == NULL || IS_ERR(temp)) {
		pr_err("debugfs_create_file failed: rc=%ld\n", PTR_ERR(temp));
		err = PTR_ERR(temp);
		goto free_debug_dir;
	}

	temp = debugfs_create_file("suspend", S_IRUSR | S_IWUSR, data->dir,
					data, &debug_suspend_fops);
	if (temp == NULL || IS_ERR(temp)) {
		pr_err("debugfs_create_file failed: rc=%ld\n", PTR_ERR(temp));
		err = PTR_ERR(temp);
		goto free_debug_dir;
	}

	temp = debugfs_create_file("dump_info", S_IRUSR | S_IWUSR, data->dir,
					data, &debug_dump_info_fops);
	if (temp == NULL || IS_ERR(temp)) {
		pr_err("debugfs_create_file failed: rc=%ld\n", PTR_ERR(temp));
		err = PTR_ERR(temp);
		goto free_debug_dir;
	}

	data->ts_info = devm_kzalloc(&client->dev,
				FT_INFO_MAX_LEN, GFP_KERNEL);
	if (!data->ts_info) {
		dev_err(&client->dev, "Not enough memory\n");
		goto free_debug_dir;
	}

	/*get some register information */
	reg_addr = FT_REG_POINT_RATE;
	ft5x06_i2c_read(client, &reg_addr, 1, &reg_value, 1);
	if (err < 0)
		dev_err(&client->dev, "report rate read failed");

	dev_info(&client->dev, "report rate = %dHz\n", reg_value * 10);

	reg_addr = FT_REG_THGROUP;
	err = ft5x06_i2c_read(client, &reg_addr, 1, &reg_value, 1);
	if (err < 0)
		dev_err(&client->dev, "threshold read failed");

	dev_dbg(&client->dev, "touch threshold = %d\n", reg_value * 4);

	ft5x06_update_fw_ver(data);

	FT_STORE_TS_INFO(data->ts_info, data->family_id, data->pdata->name,
			data->pdata->num_max_touches, data->pdata->group_id,
			data->pdata->fw_vkey_support ? "yes" : "no",
			data->pdata->fw_name, data->fw_ver[0],
			data->fw_ver[1], data->fw_ver[2]);

#if defined(CONFIG_FB)
	data->fb_notif.notifier_call = fb_notifier_callback;

	err = fb_register_client(&data->fb_notif);

	if (err)
		dev_err(&client->dev, "Unable to register fb_notifier: %d\n",
			err);
#elif defined(CONFIG_HAS_EARLYSUSPEND)
	data->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN +
						    FT_SUSPEND_LEVEL;
	data->early_suspend.suspend = ft5x06_ts_early_suspend;
	data->early_suspend.resume = ft5x06_ts_late_resume;
	register_early_suspend(&data->early_suspend);
#endif

	return 0;

free_debug_dir:
	debugfs_remove_recursive(data->dir);
free_force_update_fw_sys:
	device_remove_file(&client->dev, &dev_attr_force_update_fw);
free_update_fw_sys:
	device_remove_file(&client->dev, &dev_attr_update_fw);
free_fw_name_sys:
	device_remove_file(&client->dev, &dev_attr_fw_name);
irq_free:
	free_irq(client->irq, data);
free_reset_gpio:
	if (gpio_is_valid(pdata->reset_gpio))
		gpio_free(pdata->reset_gpio);
free_irq_gpio:
	if (gpio_is_valid(pdata->irq_gpio))
		gpio_free(pdata->irq_gpio);
pwr_off:
	if (pdata->power_on)
		pdata->power_on(false);
	else
		ft5x06_power_on(data, false);
pwr_deinit:
	if (pdata->power_init)
		pdata->power_init(false);
	else
		ft5x06_power_init(data, false);
unreg_inputdev:
	input_unregister_device(input_dev);
	input_dev = NULL;
free_inputdev:
	input_free_device(input_dev);
	return err;
}

static int __devexit ft5x06_ts_remove(struct i2c_client *client)
{
	struct ft5x06_ts_data *data = i2c_get_clientdata(client);

	debugfs_remove_recursive(data->dir);
	device_remove_file(&client->dev, &dev_attr_force_update_fw);
	device_remove_file(&client->dev, &dev_attr_update_fw);
	device_remove_file(&client->dev, &dev_attr_fw_name);

#if defined(CONFIG_FB)
	if (fb_unregister_client(&data->fb_notif))
		dev_err(&client->dev, "Error occurred while unregistering fb_notifier.\n");
#elif defined(CONFIG_HAS_EARLYSUSPEND)
	unregister_early_suspend(&data->early_suspend);
#endif
	free_irq(client->irq, data);

	if (gpio_is_valid(data->pdata->reset_gpio))
		gpio_free(data->pdata->reset_gpio);

	if (gpio_is_valid(data->pdata->irq_gpio))
		gpio_free(data->pdata->irq_gpio);

	if (data->pdata->power_on)
		data->pdata->power_on(false);
	else
		ft5x06_power_on(data, false);

	if (data->pdata->power_init)
		data->pdata->power_init(false);
	else
		ft5x06_power_init(data, false);

	input_unregister_device(data->input_dev);

	return 0;
}

static const struct i2c_device_id ft5x06_ts_id[] = {
	{"ft5x06_ts", 0},
	{},
};

MODULE_DEVICE_TABLE(i2c, ft5x06_ts_id);

#ifdef CONFIG_OF
static struct of_device_id ft5x06_match_table[] = {
	{ .compatible = "focaltech,5x06",},
	{ },
};
#else
#define ft5x06_match_table NULL
#endif

static struct i2c_driver ft5x06_ts_driver = {
	.probe = ft5x06_ts_probe,
	.remove = __devexit_p(ft5x06_ts_remove),
	.driver = {
		   .name = "ft5x06_ts",
		   .owner = THIS_MODULE,
		.of_match_table = ft5x06_match_table,
#ifdef CONFIG_PM
		   .pm = &ft5x06_ts_pm_ops,
#endif
		   },
	.id_table = ft5x06_ts_id,
};

static int __init ft5x06_ts_init(void)
{
	return i2c_add_driver(&ft5x06_ts_driver);
}
module_init(ft5x06_ts_init);

static void __exit ft5x06_ts_exit(void)
{
	i2c_del_driver(&ft5x06_ts_driver);
}
module_exit(ft5x06_ts_exit);

MODULE_DESCRIPTION("FocalTech ft5x06 TouchScreen driver");
MODULE_LICENSE("GPL v2");