drivers/input/touchscreen/atmel_mxt_ts.c

/*
 * Atmel maXTouch Touchscreen driver
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/i2c/atmel_mxt_ts.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>

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

/* Family ID */
#define MXT224_ID	0x80
#define MXT1386_ID	0xA0

/* Version */
#define MXT_VER_20		20
#define MXT_VER_21		21
#define MXT_VER_22		22

/* Slave addresses */
#define MXT_APP_LOW		0x4a
#define MXT_APP_HIGH		0x4b
#define MXT_BOOT_LOW		0x24
#define MXT_BOOT_HIGH		0x25

/* Firmware */
#define MXT_FW_NAME		"maxtouch.fw"

/* Registers */
#define MXT_FAMILY_ID		0x00
#define MXT_VARIANT_ID		0x01
#define MXT_VERSION		0x02
#define MXT_BUILD		0x03
#define MXT_MATRIX_X_SIZE	0x04
#define MXT_MATRIX_Y_SIZE	0x05
#define MXT_OBJECT_NUM		0x06
#define MXT_OBJECT_START	0x07

#define MXT_OBJECT_SIZE		6

/* Object types */
#define MXT_DEBUG_DIAGNOSTIC_T37	37
#define MXT_GEN_MESSAGE_T5		5
#define MXT_GEN_COMMAND_T6		6
#define MXT_GEN_POWER_T7		7
#define MXT_GEN_ACQUIRE_T8		8
#define MXT_GEN_DATASOURCE_T53		53
#define MXT_TOUCH_MULTI_T9		9
#define MXT_TOUCH_KEYARRAY_T15		15
#define MXT_TOUCH_PROXIMITY_T23		23
#define MXT_TOUCH_PROXKEY_T52		52
#define MXT_PROCI_GRIPFACE_T20		20
#define MXT_PROCG_NOISE_T22		22
#define MXT_PROCI_ONETOUCH_T24		24
#define MXT_PROCI_TWOTOUCH_T27		27
#define MXT_PROCI_GRIP_T40		40
#define MXT_PROCI_PALM_T41		41
#define MXT_PROCI_TOUCHSUPPRESSION_T42	42
#define MXT_PROCI_STYLUS_T47		47
#define MXT_PROCG_NOISESUPPRESSION_T48	48
#define MXT_SPT_COMMSCONFIG_T18		18
#define MXT_SPT_GPIOPWM_T19		19
#define MXT_SPT_SELFTEST_T25		25
#define MXT_SPT_CTECONFIG_T28		28
#define MXT_SPT_USERDATA_T38		38
#define MXT_SPT_DIGITIZER_T43		43
#define MXT_SPT_MESSAGECOUNT_T44	44
#define MXT_SPT_CTECONFIG_T46		46

/* MXT_GEN_COMMAND_T6 field */
#define MXT_COMMAND_RESET	0
#define MXT_COMMAND_BACKUPNV	1
#define MXT_COMMAND_CALIBRATE	2
#define MXT_COMMAND_REPORTALL	3
#define MXT_COMMAND_DIAGNOSTIC	5

/* MXT_GEN_POWER_T7 field */
#define MXT_POWER_IDLEACQINT	0
#define MXT_POWER_ACTVACQINT	1
#define MXT_POWER_ACTV2IDLETO	2

/* MXT_GEN_ACQUIRE_T8 field */
#define MXT_ACQUIRE_CHRGTIME	0
#define MXT_ACQUIRE_TCHDRIFT	2
#define MXT_ACQUIRE_DRIFTST	3
#define MXT_ACQUIRE_TCHAUTOCAL	4
#define MXT_ACQUIRE_SYNC	5
#define MXT_ACQUIRE_ATCHCALST	6
#define MXT_ACQUIRE_ATCHCALSTHR	7

/* MXT_TOUCH_MULT_T9 field */
#define MXT_TOUCH_CTRL		0
#define MXT_TOUCH_XORIGIN	1
#define MXT_TOUCH_YORIGIN	2
#define MXT_TOUCH_XSIZE		3
#define MXT_TOUCH_YSIZE		4
#define MXT_TOUCH_BLEN		6
#define MXT_TOUCH_TCHTHR	7
#define MXT_TOUCH_TCHDI		8
#define MXT_TOUCH_ORIENT	9
#define MXT_TOUCH_MOVHYSTI	11
#define MXT_TOUCH_MOVHYSTN	12
#define MXT_TOUCH_NUMTOUCH	14
#define MXT_TOUCH_MRGHYST	15
#define MXT_TOUCH_MRGTHR	16
#define MXT_TOUCH_AMPHYST	17
#define MXT_TOUCH_XRANGE_LSB	18
#define MXT_TOUCH_XRANGE_MSB	19
#define MXT_TOUCH_YRANGE_LSB	20
#define MXT_TOUCH_YRANGE_MSB	21
#define MXT_TOUCH_XLOCLIP	22
#define MXT_TOUCH_XHICLIP	23
#define MXT_TOUCH_YLOCLIP	24
#define MXT_TOUCH_YHICLIP	25
#define MXT_TOUCH_XEDGECTRL	26
#define MXT_TOUCH_XEDGEDIST	27
#define MXT_TOUCH_YEDGECTRL	28
#define MXT_TOUCH_YEDGEDIST	29
#define MXT_TOUCH_JUMPLIMIT	30

/* MXT_PROCI_GRIPFACE_T20 field */
#define MXT_GRIPFACE_CTRL	0
#define MXT_GRIPFACE_XLOGRIP	1
#define MXT_GRIPFACE_XHIGRIP	2
#define MXT_GRIPFACE_YLOGRIP	3
#define MXT_GRIPFACE_YHIGRIP	4
#define MXT_GRIPFACE_MAXTCHS	5
#define MXT_GRIPFACE_SZTHR1	7
#define MXT_GRIPFACE_SZTHR2	8
#define MXT_GRIPFACE_SHPTHR1	9
#define MXT_GRIPFACE_SHPTHR2	10
#define MXT_GRIPFACE_SUPEXTTO	11

/* MXT_PROCI_NOISE field */
#define MXT_NOISE_CTRL		0
#define MXT_NOISE_OUTFLEN	1
#define MXT_NOISE_GCAFUL_LSB	3
#define MXT_NOISE_GCAFUL_MSB	4
#define MXT_NOISE_GCAFLL_LSB	5
#define MXT_NOISE_GCAFLL_MSB	6
#define MXT_NOISE_ACTVGCAFVALID	7
#define MXT_NOISE_NOISETHR	8
#define MXT_NOISE_FREQHOPSCALE	10
#define MXT_NOISE_FREQ0		11
#define MXT_NOISE_FREQ1		12
#define MXT_NOISE_FREQ2		13
#define MXT_NOISE_FREQ3		14
#define MXT_NOISE_FREQ4		15
#define MXT_NOISE_IDLEGCAFVALID	16

/* MXT_SPT_COMMSCONFIG_T18 */
#define MXT_COMMS_CTRL		0
#define MXT_COMMS_CMD		1

/* MXT_SPT_CTECONFIG_T28 field */
#define MXT_CTE_CTRL		0
#define MXT_CTE_CMD		1
#define MXT_CTE_MODE		2
#define MXT_CTE_IDLEGCAFDEPTH	3
#define MXT_CTE_ACTVGCAFDEPTH	4
#define MXT_CTE_VOLTAGE		5

#define MXT_VOLTAGE_DEFAULT	2700000
#define MXT_VOLTAGE_STEP	10000

/* Analog voltage @2.7 V */
#define MXT_VTG_MIN_UV		2700000
#define MXT_VTG_MAX_UV		3300000
#define MXT_ACTIVE_LOAD_UA	15000
#define MXT_LPM_LOAD_UA		10
/* Digital voltage @1.8 V */
#define MXT_VTG_DIG_MIN_UV	1800000
#define MXT_VTG_DIG_MAX_UV	1800000
#define MXT_ACTIVE_LOAD_DIG_UA	10000
#define MXT_LPM_LOAD_DIG_UA	10

#define MXT_I2C_VTG_MIN_UV	1800000
#define MXT_I2C_VTG_MAX_UV	1800000
#define MXT_I2C_LOAD_UA		10000
#define MXT_I2C_LPM_LOAD_UA	10

/* Define for MXT_GEN_COMMAND_T6 */
#define MXT_BOOT_VALUE		0xa5
#define MXT_BACKUP_VALUE	0x55
#define MXT_BACKUP_TIME		25	/* msec */
#define MXT224_RESET_TIME		65	/* msec */
#define MXT1386_RESET_TIME		250	/* msec */
#define MXT_RESET_TIME		250	/* msec */
#define MXT_RESET_NOCHGREAD		400	/* msec */

#define MXT_FWRESET_TIME	175	/* msec */

#define MXT_WAKE_TIME		25

/* Command to unlock bootloader */
#define MXT_UNLOCK_CMD_MSB	0xaa
#define MXT_UNLOCK_CMD_LSB	0xdc

/* Bootloader mode status */
#define MXT_WAITING_BOOTLOAD_CMD	0xc0	/* valid 7 6 bit only */
#define MXT_WAITING_FRAME_DATA	0x80	/* valid 7 6 bit only */
#define MXT_FRAME_CRC_CHECK	0x02
#define MXT_FRAME_CRC_FAIL	0x03
#define MXT_FRAME_CRC_PASS	0x04
#define MXT_APP_CRC_FAIL	0x40	/* valid 7 8 bit only */
#define MXT_BOOT_STATUS_MASK	0x3f

/* Touch status */
#define MXT_SUPPRESS		(1 << 1)
#define MXT_AMP			(1 << 2)
#define MXT_VECTOR		(1 << 3)
#define MXT_MOVE		(1 << 4)
#define MXT_RELEASE		(1 << 5)
#define MXT_PRESS		(1 << 6)
#define MXT_DETECT		(1 << 7)

/* Touch orient bits */
#define MXT_XY_SWITCH		(1 << 0)
#define MXT_X_INVERT		(1 << 1)
#define MXT_Y_INVERT		(1 << 2)

/* Touchscreen absolute values */
#define MXT_MAX_AREA		0xff

#define MXT_MAX_FINGER		10

#define T7_DATA_SIZE		3
#define MXT_MAX_RW_TRIES	3
#define MXT_BLOCK_SIZE		256

struct mxt_info {
	u8 family_id;
	u8 variant_id;
	u8 version;
	u8 build;
	u8 matrix_xsize;
	u8 matrix_ysize;
	u8 object_num;
};

struct mxt_object {
	u8 type;
	u16 start_address;
	u8 size;
	u8 instances;
	u8 num_report_ids;

	/* to map object and message */
	u8 max_reportid;
};

struct mxt_message {
	u8 reportid;
	u8 message[7];
	u8 checksum;
};

struct mxt_finger {
	int status;
	int x;
	int y;
	int area;
	int pressure;
};

/* Each client has this additional data */
struct mxt_data {
	struct i2c_client *client;
	struct input_dev *input_dev;
	const struct mxt_platform_data *pdata;
	struct mxt_object *object_table;
	struct mxt_info info;
	struct mxt_finger finger[MXT_MAX_FINGER];
	unsigned int irq;
	struct regulator *vcc_ana;
	struct regulator *vcc_dig;
	struct regulator *vcc_i2c;
#if defined(CONFIG_HAS_EARLYSUSPEND)
	struct early_suspend early_suspend;
#endif

	u8 t7_data[T7_DATA_SIZE];
	u16 t7_start_addr;
	u8 t9_ctrl;
};

static bool mxt_object_readable(unsigned int type)
{
	switch (type) {
	case MXT_GEN_MESSAGE_T5:
	case MXT_GEN_COMMAND_T6:
	case MXT_GEN_POWER_T7:
	case MXT_GEN_ACQUIRE_T8:
	case MXT_GEN_DATASOURCE_T53:
	case MXT_TOUCH_MULTI_T9:
	case MXT_TOUCH_KEYARRAY_T15:
	case MXT_TOUCH_PROXIMITY_T23:
	case MXT_TOUCH_PROXKEY_T52:
	case MXT_PROCI_GRIPFACE_T20:
	case MXT_PROCG_NOISE_T22:
	case MXT_PROCI_ONETOUCH_T24:
	case MXT_PROCI_TWOTOUCH_T27:
	case MXT_PROCI_GRIP_T40:
	case MXT_PROCI_PALM_T41:
	case MXT_PROCI_TOUCHSUPPRESSION_T42:
	case MXT_PROCI_STYLUS_T47:
	case MXT_PROCG_NOISESUPPRESSION_T48:
	case MXT_SPT_COMMSCONFIG_T18:
	case MXT_SPT_GPIOPWM_T19:
	case MXT_SPT_SELFTEST_T25:
	case MXT_SPT_CTECONFIG_T28:
	case MXT_SPT_USERDATA_T38:
	case MXT_SPT_DIGITIZER_T43:
	case MXT_SPT_CTECONFIG_T46:
		return true;
	default:
		return false;
	}
}

static bool mxt_object_writable(unsigned int type)
{
	switch (type) {
	case MXT_GEN_COMMAND_T6:
	case MXT_GEN_POWER_T7:
	case MXT_GEN_ACQUIRE_T8:
	case MXT_TOUCH_MULTI_T9:
	case MXT_TOUCH_KEYARRAY_T15:
	case MXT_TOUCH_PROXIMITY_T23:
	case MXT_TOUCH_PROXKEY_T52:
	case MXT_PROCI_GRIPFACE_T20:
	case MXT_PROCG_NOISE_T22:
	case MXT_PROCI_ONETOUCH_T24:
	case MXT_PROCI_TWOTOUCH_T27:
	case MXT_PROCI_GRIP_T40:
	case MXT_PROCI_PALM_T41:
	case MXT_PROCI_TOUCHSUPPRESSION_T42:
	case MXT_PROCI_STYLUS_T47:
	case MXT_PROCG_NOISESUPPRESSION_T48:
	case MXT_SPT_COMMSCONFIG_T18:
	case MXT_SPT_GPIOPWM_T19:
	case MXT_SPT_SELFTEST_T25:
	case MXT_SPT_CTECONFIG_T28:
	case MXT_SPT_USERDATA_T38:
	case MXT_SPT_DIGITIZER_T43:
	case MXT_SPT_CTECONFIG_T46:
		return true;
	default:
		return false;
	}
}

static void mxt_dump_message(struct device *dev,
				  struct mxt_message *message)
{
	dev_dbg(dev, "reportid:\t0x%x\n", message->reportid);
	dev_dbg(dev, "message1:\t0x%x\n", message->message[0]);
	dev_dbg(dev, "message2:\t0x%x\n", message->message[1]);
	dev_dbg(dev, "message3:\t0x%x\n", message->message[2]);
	dev_dbg(dev, "message4:\t0x%x\n", message->message[3]);
	dev_dbg(dev, "message5:\t0x%x\n", message->message[4]);
	dev_dbg(dev, "message6:\t0x%x\n", message->message[5]);
	dev_dbg(dev, "message7:\t0x%x\n", message->message[6]);
	dev_dbg(dev, "checksum:\t0x%x\n", message->checksum);
}

static int mxt_check_bootloader(struct i2c_client *client,
				     unsigned int state)
{
	u8 val;

recheck:
	if (i2c_master_recv(client, &val, 1) != 1) {
		dev_err(&client->dev, "%s: i2c recv failed\n", __func__);
		return -EIO;
	}

	switch (state) {
	case MXT_WAITING_BOOTLOAD_CMD:
	case MXT_WAITING_FRAME_DATA:
		val &= ~MXT_BOOT_STATUS_MASK;
		break;
	case MXT_FRAME_CRC_PASS:
		if (val == MXT_FRAME_CRC_CHECK)
			goto recheck;
		break;
	default:
		return -EINVAL;
	}

	if (val != state) {
		dev_err(&client->dev, "Unvalid bootloader mode state\n");
		return -EINVAL;
	}

	return 0;
}

static int mxt_unlock_bootloader(struct i2c_client *client)
{
	u8 buf[2];

	buf[0] = MXT_UNLOCK_CMD_LSB;
	buf[1] = MXT_UNLOCK_CMD_MSB;

	if (i2c_master_send(client, buf, 2) != 2) {
		dev_err(&client->dev, "%s: i2c send failed\n", __func__);
		return -EIO;
	}

	return 0;
}

static int mxt_fw_write(struct i2c_client *client,
			     const u8 *data, unsigned int frame_size)
{
	if (i2c_master_send(client, data, frame_size) != frame_size) {
		dev_err(&client->dev, "%s: i2c send failed\n", __func__);
		return -EIO;
	}

	return 0;
}

static int __mxt_read_reg(struct i2c_client *client,
			       u16 reg, u16 len, void *val)
{
	struct i2c_msg xfer[2];
	u8 buf[2];
	int i = 0;

	buf[0] = reg & 0xff;
	buf[1] = (reg >> 8) & 0xff;

	/* Write register */
	xfer[0].addr = client->addr;
	xfer[0].flags = 0;
	xfer[0].len = 2;
	xfer[0].buf = buf;

	/* Read data */
	xfer[1].addr = client->addr;
	xfer[1].flags = I2C_M_RD;
	xfer[1].len = len;
	xfer[1].buf = val;

	do {
		if (i2c_transfer(client->adapter, xfer, 2) == 2)
			return 0;
		msleep(MXT_WAKE_TIME);
	} while (++i < MXT_MAX_RW_TRIES);

	dev_err(&client->dev, "%s: i2c transfer failed\n", __func__);
	return -EIO;
}

static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val)
{
	return __mxt_read_reg(client, reg, 1, val);
}

static int __mxt_write_reg(struct i2c_client *client,
		    u16 addr, u16 length, u8 *value)
{
	u8 buf[MXT_BLOCK_SIZE + 2];
	int i, tries = 0;

	if (length > MXT_BLOCK_SIZE)
		return -EINVAL;

	buf[0] = addr & 0xff;
	buf[1] = (addr >> 8) & 0xff;
	for (i = 0; i < length; i++)
		buf[i + 2] = *value++;

	do {
		if (i2c_master_send(client, buf, length + 2) == (length + 2))
			return 0;
		msleep(MXT_WAKE_TIME);
	} while (++tries < MXT_MAX_RW_TRIES);

	dev_err(&client->dev, "%s: i2c send failed\n", __func__);
	return -EIO;
}

static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
	return __mxt_write_reg(client, reg, 1, &val);
}

static int mxt_read_object_table(struct i2c_client *client,
				      u16 reg, u8 *object_buf)
{
	return __mxt_read_reg(client, reg, MXT_OBJECT_SIZE,
				   object_buf);
}

static struct mxt_object *
mxt_get_object(struct mxt_data *data, u8 type)
{
	struct mxt_object *object;
	int i;

	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;
		if (object->type == type)
			return object;
	}

	dev_err(&data->client->dev, "Invalid object type\n");
	return NULL;
}

static int mxt_read_message(struct mxt_data *data,
				 struct mxt_message *message)
{
	struct mxt_object *object;
	u16 reg;

	object = mxt_get_object(data, MXT_GEN_MESSAGE_T5);
	if (!object)
		return -EINVAL;

	reg = object->start_address;
	return __mxt_read_reg(data->client, reg,
			sizeof(struct mxt_message), message);
}

static int mxt_read_object(struct mxt_data *data,
				u8 type, u8 offset, u8 *val)
{
	struct mxt_object *object;
	u16 reg;

	object = mxt_get_object(data, type);
	if (!object)
		return -EINVAL;

	reg = object->start_address;
	return __mxt_read_reg(data->client, reg + offset, 1, val);
}

static int mxt_write_object(struct mxt_data *data,
				 u8 type, u8 offset, u8 val)
{
	struct mxt_object *object;
	u16 reg;

	object = mxt_get_object(data, type);
	if (!object)
		return -EINVAL;

	reg = object->start_address;
	return mxt_write_reg(data->client, reg + offset, val);
}

static void mxt_input_report(struct mxt_data *data, int single_id)
{
	struct mxt_finger *finger = data->finger;
	struct input_dev *input_dev = data->input_dev;
	int status = finger[single_id].status;
	int finger_num = 0;
	int id;

	for (id = 0; id < MXT_MAX_FINGER; id++) {
		if (!finger[id].status)
			continue;

		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
				finger[id].status != MXT_RELEASE ?
				finger[id].area : 0);
		input_report_abs(input_dev, ABS_MT_POSITION_X,
				finger[id].x);
		input_report_abs(input_dev, ABS_MT_POSITION_Y,
				finger[id].y);
		input_report_abs(input_dev, ABS_MT_PRESSURE,
					finger[id].pressure);
		input_mt_sync(input_dev);

		if (finger[id].status == MXT_RELEASE)
			finger[id].status = 0;
		else
			finger_num++;
	}

	input_report_key(input_dev, BTN_TOUCH, finger_num > 0);

	if (status != MXT_RELEASE) {
		input_report_abs(input_dev, ABS_X, finger[single_id].x);
		input_report_abs(input_dev, ABS_Y, finger[single_id].y);
		input_report_abs(input_dev,
			ABS_PRESSURE, finger[single_id].pressure);
	}

	input_sync(input_dev);
}

static void mxt_input_touchevent(struct mxt_data *data,
				      struct mxt_message *message, int id)
{
	struct mxt_finger *finger = data->finger;
	struct device *dev = &data->client->dev;
	u8 status = message->message[0];
	int x;
	int y;
	int area;
	int pressure;

	/* Check the touch is present on the screen */
	if (!(status & MXT_DETECT)) {
		if (status & MXT_RELEASE) {
			dev_dbg(dev, "[%d] released\n", id);

			finger[id].status = MXT_RELEASE;
			mxt_input_report(data, id);
		}
		return;
	}

	/* Check only AMP detection */
	if (!(status & (MXT_PRESS | MXT_MOVE)))
		return;

	x = (message->message[1] << 4) | ((message->message[3] >> 4) & 0xf);
	y = (message->message[2] << 4) | ((message->message[3] & 0xf));
	if (data->pdata->x_size < 1024)
		x = x >> 2;
	if (data->pdata->y_size < 1024)
		y = y >> 2;

	area = message->message[4];
	pressure = message->message[5];

	dev_dbg(dev, "[%d] %s x: %d, y: %d, area: %d\n", id,
		status & MXT_MOVE ? "moved" : "pressed",
		x, y, area);

	finger[id].status = status & MXT_MOVE ?
				MXT_MOVE : MXT_PRESS;
	finger[id].x = x;
	finger[id].y = y;
	finger[id].area = area;
	finger[id].pressure = pressure;

	mxt_input_report(data, id);
}

static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
	struct mxt_data *data = dev_id;
	struct mxt_message message;
	struct mxt_object *object;
	struct device *dev = &data->client->dev;
	int id;
	u8 reportid;
	u8 max_reportid;
	u8 min_reportid;

	do {
		if (mxt_read_message(data, &message)) {
			dev_err(dev, "Failed to read message\n");
			goto end;
		}
		reportid = message.reportid;

		/* whether reportid is thing of MXT_TOUCH_MULTI_T9 */
		object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
		if (!object)
			goto end;
		max_reportid = object->max_reportid;
		min_reportid = max_reportid - object->num_report_ids + 1;
		id = reportid - min_reportid;

		if (reportid >= min_reportid && reportid <= max_reportid)
			mxt_input_touchevent(data, &message, id);
		else
			mxt_dump_message(dev, &message);
	} while (reportid != 0xff);

end:
	return IRQ_HANDLED;
}

static int mxt_check_reg_init(struct mxt_data *data)
{
	const struct mxt_platform_data *pdata = data->pdata;
	struct mxt_object *object;
	struct device *dev = &data->client->dev;
	int index = 0;
	int i, j, config_offset;

	if (!pdata->config) {
		dev_dbg(dev, "No cfg data defined, skipping reg init\n");
		return 0;
	}

	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;

		if (!mxt_object_writable(object->type))
			continue;

		for (j = 0; j < object->size + 1; j++) {
			config_offset = index + j;
			if (config_offset > pdata->config_length) {
				dev_err(dev, "Not enough config data!\n");
				return -EINVAL;
			}
			mxt_write_object(data, object->type, j,
					 pdata->config[config_offset]);
		}
		index += object->size + 1;
	}

	return 0;
}

static int mxt_make_highchg(struct mxt_data *data)
{
	struct device *dev = &data->client->dev;
	struct mxt_message message;
	int count = 10;
	int error;

	/* Read dummy message to make high CHG pin */
	do {
		error = mxt_read_message(data, &message);
		if (error)
			return error;
	} while (message.reportid != 0xff && --count);

	if (!count) {
		dev_err(dev, "CHG pin isn't cleared\n");
		return -EBUSY;
	}

	return 0;
}

static int mxt_get_info(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	struct mxt_info *info = &data->info;
	int error;
	u8 val;

	error = mxt_read_reg(client, MXT_FAMILY_ID, &val);
	if (error)
		return error;
	info->family_id = val;

	error = mxt_read_reg(client, MXT_VARIANT_ID, &val);
	if (error)
		return error;
	info->variant_id = val;

	error = mxt_read_reg(client, MXT_VERSION, &val);
	if (error)
		return error;
	info->version = val;

	error = mxt_read_reg(client, MXT_BUILD, &val);
	if (error)
		return error;
	info->build = val;

	error = mxt_read_reg(client, MXT_OBJECT_NUM, &val);
	if (error)
		return error;
	info->object_num = val;

	return 0;
}

static int mxt_get_object_table(struct mxt_data *data)
{
	int error;
	int i;
	u16 reg;
	u8 reportid = 0;
	u8 buf[MXT_OBJECT_SIZE];

	for (i = 0; i < data->info.object_num; i++) {
		struct mxt_object *object = data->object_table + i;

		reg = MXT_OBJECT_START + MXT_OBJECT_SIZE * i;
		error = mxt_read_object_table(data->client, reg, buf);
		if (error)
			return error;

		object->type = buf[0];
		object->start_address = (buf[2] << 8) | buf[1];
		object->size = buf[3];
		object->instances = buf[4];
		object->num_report_ids = buf[5];

		if (object->num_report_ids) {
			reportid += object->num_report_ids *
					(object->instances + 1);
			object->max_reportid = reportid;
		}
	}

	return 0;
}

static void mxt_reset_delay(struct mxt_data *data)
{
	struct mxt_info *info = &data->info;

	switch (info->family_id) {
	case MXT224_ID:
		msleep(MXT224_RESET_TIME);
		break;
	case MXT1386_ID:
		msleep(MXT1386_RESET_TIME);
		break;
	default:
		msleep(MXT_RESET_TIME);
	}
}

static int mxt_initialize(struct mxt_data *data)
{
	struct i2c_client *client = data->client;
	struct mxt_info *info = &data->info;
	int error;
	int timeout_counter = 0;
	u8 val;
	u8 command_register;
	struct mxt_object *t7_object;

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

	data->object_table = kcalloc(info->object_num,
				     sizeof(struct mxt_object),
				     GFP_KERNEL);
	if (!data->object_table) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		return -ENOMEM;
	}

	/* Get object table information */
	error = mxt_get_object_table(data);
	if (error)
		goto free_object_table;

	/* Check register init values */
	error = mxt_check_reg_init(data);
	if (error)
		goto free_object_table;

	/* Store T7 and T9 locally, used in suspend/resume operations */
	t7_object = mxt_get_object(data, MXT_GEN_POWER_T7);
	if (!t7_object) {
		dev_err(&client->dev, "Failed to get T7 object\n");
		error = -EINVAL;
		goto free_object_table;
	}

	data->t7_start_addr = t7_object->start_address;
	error = __mxt_read_reg(client, data->t7_start_addr,
				T7_DATA_SIZE, data->t7_data);
	if (error < 0) {
		dev_err(&client->dev,
			"Failed to save current power state\n");
		goto free_object_table;
	}
	error = mxt_read_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL,
			&data->t9_ctrl);
	if (error < 0) {
		dev_err(&client->dev, "Failed to save current touch object\n");
		goto free_object_table;
	}

	/* Backup to memory */
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
			MXT_COMMAND_BACKUPNV,
			MXT_BACKUP_VALUE);
	msleep(MXT_BACKUP_TIME);
	do {
		error =  mxt_read_object(data, MXT_GEN_COMMAND_T6,
					MXT_COMMAND_BACKUPNV,
					&command_register);
		if (error)
			goto free_object_table;
		usleep_range(1000, 2000);
	} while ((command_register != 0) && (++timeout_counter <= 100));
	if (timeout_counter > 100) {
		dev_err(&client->dev, "No response after backup!\n");
		error = -EIO;
		goto free_object_table;
	}


	/* Soft reset */
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
			MXT_COMMAND_RESET, 1);

	mxt_reset_delay(data);

	/* Update matrix size at info struct */
	error = mxt_read_reg(client, MXT_MATRIX_X_SIZE, &val);
	if (error)
		goto free_object_table;
	info->matrix_xsize = val;

	error = mxt_read_reg(client, MXT_MATRIX_Y_SIZE, &val);
	if (error)
		goto free_object_table;
	info->matrix_ysize = val;

	dev_info(&client->dev,
			"Family ID: %d Variant ID: %d Version: %d Build: %d\n",
			info->family_id, info->variant_id, info->version,
			info->build);

	dev_info(&client->dev,
			"Matrix X Size: %d Matrix Y Size: %d Object Num: %d\n",
			info->matrix_xsize, info->matrix_ysize,
			info->object_num);

	return 0;

free_object_table:
	kfree(data->object_table);
	return error;
}

static ssize_t mxt_object_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_object *object;
	int count = 0;
	int i, j;
	int error;
	u8 val;

	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;

		count += snprintf(buf + count, PAGE_SIZE - count,
				"Object[%d] (Type %d)\n",
				i + 1, object->type);
		if (count >= PAGE_SIZE)
			return PAGE_SIZE - 1;

		if (!mxt_object_readable(object->type)) {
			count += snprintf(buf + count, PAGE_SIZE - count,
					"\n");
			if (count >= PAGE_SIZE)
				return PAGE_SIZE - 1;
			continue;
		}

		for (j = 0; j < object->size + 1; j++) {
			error = mxt_read_object(data,
						object->type, j, &val);
			if (error)
				return error;

			count += snprintf(buf + count, PAGE_SIZE - count,
					"\t[%2d]: %02x (%d)\n", j, val, val);
			if (count >= PAGE_SIZE)
				return PAGE_SIZE - 1;
		}

		count += snprintf(buf + count, PAGE_SIZE - count, "\n");
		if (count >= PAGE_SIZE)
			return PAGE_SIZE - 1;
	}

	return count;
}

static int mxt_load_fw(struct device *dev, const char *fn)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	const struct firmware *fw = NULL;
	unsigned int frame_size;
	unsigned int pos = 0;
	int ret;

	ret = request_firmware(&fw, fn, dev);
	if (ret) {
		dev_err(dev, "Unable to open firmware %s\n", fn);
		return ret;
	}

	/* Change to the bootloader mode */
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
			MXT_COMMAND_RESET, MXT_BOOT_VALUE);

	mxt_reset_delay(data);

	/* Change to slave address of bootloader */
	if (client->addr == MXT_APP_LOW)
		client->addr = MXT_BOOT_LOW;
	else
		client->addr = MXT_BOOT_HIGH;

	ret = mxt_check_bootloader(client, MXT_WAITING_BOOTLOAD_CMD);
	if (ret)
		goto out;

	/* Unlock bootloader */
	mxt_unlock_bootloader(client);

	while (pos < fw->size) {
		ret = mxt_check_bootloader(client,
						MXT_WAITING_FRAME_DATA);
		if (ret)
			goto out;

		frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));

		/* We should add 2 at frame size as the the firmware data is not
		 * included the CRC bytes.
		 */
		frame_size += 2;

		/* Write one frame to device */
		mxt_fw_write(client, fw->data + pos, frame_size);

		ret = mxt_check_bootloader(client,
						MXT_FRAME_CRC_PASS);
		if (ret)
			goto out;

		pos += frame_size;

		dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size);
	}

out:
	release_firmware(fw);

	/* Change to slave address of application */
	if (client->addr == MXT_BOOT_LOW)
		client->addr = MXT_APP_LOW;
	else
		client->addr = MXT_APP_HIGH;

	return ret;
}

static ssize_t mxt_update_fw_store(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	int error;

	disable_irq(data->irq);

	error = mxt_load_fw(dev, MXT_FW_NAME);
	if (error) {
		dev_err(dev, "The firmware update failed(%d)\n", error);
		count = error;
	} else {
		dev_dbg(dev, "The firmware update succeeded\n");

		/* Wait for reset */
		msleep(MXT_FWRESET_TIME);

		kfree(data->object_table);
		data->object_table = NULL;

		mxt_initialize(data);
	}

	enable_irq(data->irq);

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

	return count;
}

static DEVICE_ATTR(object, 0444, mxt_object_show, NULL);
static DEVICE_ATTR(update_fw, 0664, NULL, mxt_update_fw_store);

static struct attribute *mxt_attrs[] = {
	&dev_attr_object.attr,
	&dev_attr_update_fw.attr,
	NULL
};

static const struct attribute_group mxt_attr_group = {
	.attrs = mxt_attrs,
};

static int mxt_start(struct mxt_data *data)
{
	int error;

	/* restore the old power state values and reenable touch */
	error = __mxt_write_reg(data->client, data->t7_start_addr,
				T7_DATA_SIZE, data->t7_data);
	if (error < 0) {
		dev_err(&data->client->dev,
			"failed to restore old power state\n");
		return error;
	}

	error = mxt_write_object(data,
			MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, data->t9_ctrl);
	if (error < 0) {
		dev_err(&data->client->dev, "failed to restore touch\n");
		return error;
	}

	return 0;
}

static int mxt_stop(struct mxt_data *data)
{
	int error;
	u8 t7_data[T7_DATA_SIZE] = {0};

	/* disable touch and configure deep sleep mode */
	error = mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0);
	if (error < 0) {
		dev_err(&data->client->dev, "failed to disable touch\n");
		return error;
	}

	error = __mxt_write_reg(data->client, data->t7_start_addr,
				T7_DATA_SIZE, t7_data);
	if (error < 0) {
		dev_err(&data->client->dev,
			"failed to configure deep sleep mode\n");
		return error;
	}

	return 0;
}

static int mxt_input_open(struct input_dev *dev)
{
	struct mxt_data *data = input_get_drvdata(dev);
	int error;

	error = mxt_start(data);
	if (error < 0) {
		dev_err(&data->client->dev, "mxt_start failed in input_open\n");
		return error;
	}

	return 0;
}

static void mxt_input_close(struct input_dev *dev)
{
	struct mxt_data *data = input_get_drvdata(dev);
	int error;

	error = mxt_stop(data);
	if (error < 0)
		dev_err(&data->client->dev, "mxt_stop failed in input_close\n");

}

static int mxt_power_on(struct mxt_data *data, bool on)
{
	int rc;

	if (on == false)
		goto power_off;

	rc = regulator_set_optimum_mode(data->vcc_ana, MXT_ACTIVE_LOAD_UA);
	if (rc < 0) {
		dev_err(&data->client->dev,
			"Regulator vcc_ana set_opt failed rc=%d\n", rc);
		return rc;
	}

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

	if (data->pdata->digital_pwr_regulator) {
		rc = regulator_set_optimum_mode(data->vcc_dig,
						MXT_ACTIVE_LOAD_DIG_UA);
		if (rc < 0) {
			dev_err(&data->client->dev,
				"Regulator vcc_dig set_opt failed rc=%d\n",
				rc);
			goto error_reg_opt_vcc_dig;
		}

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

	if (data->pdata->i2c_pull_up) {
		rc = regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LOAD_UA);
		if (rc < 0) {
			dev_err(&data->client->dev,
				"Regulator vcc_i2c set_opt failed rc=%d\n", rc);
			goto error_reg_opt_i2c;
		}

		rc = regulator_enable(data->vcc_i2c);
		if (rc) {
			dev_err(&data->client->dev,
				"Regulator vcc_i2c enable failed rc=%d\n", rc);
			goto error_reg_en_vcc_i2c;
		}
	}

	msleep(130);

	return 0;

error_reg_en_vcc_i2c:
	if (data->pdata->i2c_pull_up)
		regulator_set_optimum_mode(data->vcc_i2c, 0);
error_reg_opt_i2c:
	if (data->pdata->digital_pwr_regulator)
		regulator_disable(data->vcc_dig);
error_reg_en_vcc_dig:
	if (data->pdata->digital_pwr_regulator)
		regulator_set_optimum_mode(data->vcc_dig, 0);
error_reg_opt_vcc_dig:
	regulator_disable(data->vcc_ana);
error_reg_en_vcc_ana:
	regulator_set_optimum_mode(data->vcc_ana, 0);
	return rc;

power_off:
	regulator_set_optimum_mode(data->vcc_ana, 0);
	regulator_disable(data->vcc_ana);
	if (data->pdata->digital_pwr_regulator) {
		regulator_set_optimum_mode(data->vcc_dig, 0);
		regulator_disable(data->vcc_dig);
	}
	if (data->pdata->i2c_pull_up) {
		regulator_set_optimum_mode(data->vcc_i2c, 0);
		regulator_disable(data->vcc_i2c);
	}
	msleep(50);
	return 0;
}

static int mxt_regulator_configure(struct mxt_data *data, bool on)
{
	int rc;

	if (on == false)
		goto hw_shutdown;

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

	if (regulator_count_voltages(data->vcc_ana) > 0) {
		rc = regulator_set_voltage(data->vcc_ana, MXT_VTG_MIN_UV,
							MXT_VTG_MAX_UV);
		if (rc) {
			dev_err(&data->client->dev,
				"regulator set_vtg failed rc=%d\n", rc);
			goto error_set_vtg_vcc_ana;
		}
	}
	if (data->pdata->digital_pwr_regulator) {
		data->vcc_dig = regulator_get(&data->client->dev, "vdd_dig");
		if (IS_ERR(data->vcc_dig)) {
			rc = PTR_ERR(data->vcc_dig);
			dev_err(&data->client->dev,
				"Regulator get dig failed rc=%d\n", rc);
			goto error_get_vtg_vcc_dig;
		}

		if (regulator_count_voltages(data->vcc_dig) > 0) {
			rc = regulator_set_voltage(data->vcc_dig,
				MXT_VTG_DIG_MIN_UV, MXT_VTG_DIG_MAX_UV);
			if (rc) {
				dev_err(&data->client->dev,
					"regulator set_vtg failed rc=%d\n", rc);
				goto error_set_vtg_vcc_dig;
			}
		}
	}
	if (data->pdata->i2c_pull_up) {
		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 rc=%d\n",	rc);
			goto error_get_vtg_i2c;
		}
		if (regulator_count_voltages(data->vcc_i2c) > 0) {
			rc = regulator_set_voltage(data->vcc_i2c,
				MXT_I2C_VTG_MIN_UV, MXT_I2C_VTG_MAX_UV);
			if (rc) {
				dev_err(&data->client->dev,
					"regulator set_vtg failed rc=%d\n", rc);
				goto error_set_vtg_i2c;
			}
		}
	}

	return 0;

error_set_vtg_i2c:
	regulator_put(data->vcc_i2c);
error_get_vtg_i2c:
	if (data->pdata->digital_pwr_regulator)
		if (regulator_count_voltages(data->vcc_dig) > 0)
			regulator_set_voltage(data->vcc_dig, 0,
				MXT_VTG_DIG_MAX_UV);
error_set_vtg_vcc_dig:
	if (data->pdata->digital_pwr_regulator)
		regulator_put(data->vcc_dig);
error_get_vtg_vcc_dig:
	if (regulator_count_voltages(data->vcc_ana) > 0)
		regulator_set_voltage(data->vcc_ana, 0, MXT_VTG_MAX_UV);
error_set_vtg_vcc_ana:
	regulator_put(data->vcc_ana);
	return rc;

hw_shutdown:
	if (regulator_count_voltages(data->vcc_ana) > 0)
		regulator_set_voltage(data->vcc_ana, 0, MXT_VTG_MAX_UV);
	regulator_put(data->vcc_ana);
	if (data->pdata->digital_pwr_regulator) {
		if (regulator_count_voltages(data->vcc_dig) > 0)
			regulator_set_voltage(data->vcc_dig, 0,
						MXT_VTG_DIG_MAX_UV);
		regulator_put(data->vcc_dig);
	}
	if (data->pdata->i2c_pull_up) {
		if (regulator_count_voltages(data->vcc_i2c) > 0)
			regulator_set_voltage(data->vcc_i2c, 0,
						MXT_I2C_VTG_MAX_UV);
		regulator_put(data->vcc_i2c);
	}
	return 0;
}

#ifdef CONFIG_PM
static int mxt_regulator_lpm(struct mxt_data *data, bool on)
{

	int rc;

	if (on == false)
		goto regulator_hpm;

	rc = regulator_set_optimum_mode(data->vcc_ana, MXT_LPM_LOAD_UA);
	if (rc < 0) {
		dev_err(&data->client->dev,
			"Regulator vcc_ana set_opt failed rc=%d\n", rc);
		goto fail_regulator_lpm;
	}

	if (data->pdata->digital_pwr_regulator) {
		rc = regulator_set_optimum_mode(data->vcc_dig,
						MXT_LPM_LOAD_DIG_UA);
		if (rc < 0) {
			dev_err(&data->client->dev,
				"Regulator vcc_dig set_opt failed rc=%d\n", rc);
			goto fail_regulator_lpm;
		}
	}

	if (data->pdata->i2c_pull_up) {
		rc = regulator_set_optimum_mode(data->vcc_i2c,
						MXT_I2C_LPM_LOAD_UA);
		if (rc < 0) {
			dev_err(&data->client->dev,
				"Regulator vcc_i2c set_opt failed rc=%d\n", rc);
			goto fail_regulator_lpm;
		}
	}

	return 0;

regulator_hpm:

	rc = regulator_set_optimum_mode(data->vcc_ana, MXT_ACTIVE_LOAD_UA);
	if (rc < 0) {
		dev_err(&data->client->dev,
			"Regulator vcc_ana set_opt failed rc=%d\n", rc);
		goto fail_regulator_hpm;
	}

	if (data->pdata->digital_pwr_regulator) {
		rc = regulator_set_optimum_mode(data->vcc_dig,
						 MXT_ACTIVE_LOAD_DIG_UA);
		if (rc < 0) {
			dev_err(&data->client->dev,
				"Regulator vcc_dig set_opt failed rc=%d\n", rc);
			goto fail_regulator_hpm;
		}
	}

	if (data->pdata->i2c_pull_up) {
		rc = regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LOAD_UA);
		if (rc < 0) {
			dev_err(&data->client->dev,
				"Regulator vcc_i2c set_opt failed rc=%d\n", rc);
			goto fail_regulator_hpm;
		}
	}

	return 0;

fail_regulator_lpm:
	regulator_set_optimum_mode(data->vcc_ana, MXT_ACTIVE_LOAD_UA);
	if (data->pdata->digital_pwr_regulator)
		regulator_set_optimum_mode(data->vcc_dig,
						MXT_ACTIVE_LOAD_DIG_UA);
	if (data->pdata->i2c_pull_up)
		regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LOAD_UA);

	return rc;

fail_regulator_hpm:
	regulator_set_optimum_mode(data->vcc_ana, MXT_LPM_LOAD_UA);
	if (data->pdata->digital_pwr_regulator)
		regulator_set_optimum_mode(data->vcc_dig, MXT_LPM_LOAD_DIG_UA);
	if (data->pdata->i2c_pull_up)
		regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LPM_LOAD_UA);

	return rc;
}

static int mxt_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mxt_data *data = i2c_get_clientdata(client);
	struct input_dev *input_dev = data->input_dev;
	int error;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users) {
		error = mxt_stop(data);
		if (error < 0) {
			dev_err(dev, "mxt_stop failed in suspend\n");
			mutex_unlock(&input_dev->mutex);
			return error;
		}

	}

	mutex_unlock(&input_dev->mutex);

	/* put regulators in low power mode */
	error = mxt_regulator_lpm(data, true);
	if (error < 0) {
		dev_err(dev, "failed to enter low power mode\n");
		return error;
	}

	return 0;
}

static int mxt_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mxt_data *data = i2c_get_clientdata(client);
	struct input_dev *input_dev = data->input_dev;
	int error;

	/* put regulators in high power mode */
	error = mxt_regulator_lpm(data, false);
	if (error < 0) {
		dev_err(dev, "failed to enter high power mode\n");
		return error;
	}

	mutex_lock(&input_dev->mutex);

	if (input_dev->users) {
		error = mxt_start(data);
		if (error < 0) {
			dev_err(dev, "mxt_start failed in resume\n");
			mutex_unlock(&input_dev->mutex);
			return error;
		}
	}

	mutex_unlock(&input_dev->mutex);

	return 0;
}

#if defined(CONFIG_HAS_EARLYSUSPEND)
static void mxt_early_suspend(struct early_suspend *h)
{
	struct mxt_data *data = container_of(h, struct mxt_data, early_suspend);

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

static void mxt_late_resume(struct early_suspend *h)
{
	struct mxt_data *data = container_of(h, struct mxt_data, early_suspend);

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

static const struct dev_pm_ops mxt_pm_ops = {
#ifndef CONFIG_HAS_EARLYSUSPEND
	.suspend	= mxt_suspend,
	.resume		= mxt_resume,
#endif
};
#endif

static int __devinit mxt_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	const struct mxt_platform_data *pdata = client->dev.platform_data;
	struct mxt_data *data;
	struct input_dev *input_dev;
	int error;

	if (!pdata)
		return -EINVAL;

	data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!data || !input_dev) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	input_dev->name = "Atmel maXTouch Touchscreen";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;
	input_dev->open = mxt_input_open;
	input_dev->close = mxt_input_close;

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

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

	/* For single touch */
	input_set_abs_params(input_dev, ABS_X,
			     0, data->pdata->x_size, 0, 0);
	input_set_abs_params(input_dev, ABS_Y,
			     0, data->pdata->y_size, 0, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE,
			     0, 255, 0, 0);

	/* For multi touch */
	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
			     0, MXT_MAX_AREA, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
			     0, data->pdata->x_size, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
			     0, data->pdata->y_size, 0, 0);
	input_set_abs_params(input_dev, ABS_MT_PRESSURE,
			     0, 255, 0, 0);

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

	if (pdata->init_hw)
		error = pdata->init_hw(true);
	else
		error = mxt_regulator_configure(data, true);
	if (error) {
		dev_err(&client->dev, "Failed to intialize hardware\n");
		goto err_free_mem;
	}

	if (pdata->power_on)
		error = pdata->power_on(true);
	else
		error = mxt_power_on(data, true);
	if (error) {
		dev_err(&client->dev, "Failed to power on hardware\n");
		goto err_regulator_on;
	}

	error = mxt_initialize(data);
	if (error)
		goto err_power_on;

	error = request_threaded_irq(client->irq, NULL, mxt_interrupt,
			pdata->irqflags, client->dev.driver->name, data);
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_object;
	}

	error = mxt_make_highchg(data);
	if (error)
		goto err_free_irq;

	error = input_register_device(input_dev);
	if (error)
		goto err_free_irq;

	error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
	if (error)
		goto err_unregister_device;

#if defined(CONFIG_HAS_EARLYSUSPEND)
	data->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN +
						MXT_SUSPEND_LEVEL;
	data->early_suspend.suspend = mxt_early_suspend;
	data->early_suspend.resume = mxt_late_resume;
	register_early_suspend(&data->early_suspend);
#endif

	return 0;

err_unregister_device:
	input_unregister_device(input_dev);
	input_dev = NULL;
err_free_irq:
	free_irq(client->irq, data);
err_free_object:
	kfree(data->object_table);
err_power_on:
	if (pdata->power_on)
		pdata->power_on(false);
	else
		mxt_power_on(data, false);
err_regulator_on:
	if (pdata->init_hw)
		pdata->init_hw(false);
	else
		mxt_regulator_configure(data, false);
err_free_mem:
	input_free_device(input_dev);
	kfree(data);
	return error;
}

static int __devexit mxt_remove(struct i2c_client *client)
{
	struct mxt_data *data = i2c_get_clientdata(client);

	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
	free_irq(data->irq, data);
	input_unregister_device(data->input_dev);
#if defined(CONFIG_HAS_EARLYSUSPEND)
	unregister_early_suspend(&data->early_suspend);
#endif

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

	if (data->pdata->init_hw)
		data->pdata->init_hw(false);
	else
		mxt_regulator_configure(data, false);

	kfree(data->object_table);
	kfree(data);

	return 0;
}

static const struct i2c_device_id mxt_id[] = {
	{ "qt602240_ts", 0 },
	{ "atmel_mxt_ts", 0 },
	{ "mXT224", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mxt_id);

static struct i2c_driver mxt_driver = {
	.driver = {
		.name	= "atmel_mxt_ts",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &mxt_pm_ops,
#endif
	},
	.probe		= mxt_probe,
	.remove		= __devexit_p(mxt_remove),
	.id_table	= mxt_id,
};

static int __init mxt_init(void)
{
	return i2c_add_driver(&mxt_driver);
}

static void __exit mxt_exit(void)
{
	i2c_del_driver(&mxt_driver);
}

module_init(mxt_init);
module_exit(mxt_exit);

/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
MODULE_LICENSE("GPL");