/*
 *  Copyright (C) 2012-2013 Freescale Semiconductor, Inc. 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.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pm.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/input-polldev.h>
#include <linux/miscdevice.h>
#include <linux/poll.h>

/*register define*/
#define FXOS8700_STATUS 		0x00
#define FXOS8700_OUT_X_MSB 		0x01
#define FXOS8700_OUT_X_LSB 		0x02
#define FXOS8700_OUT_Y_MSB 		0x03
#define FXOS8700_OUT_Y_LSB 		0x04
#define FXOS8700_OUT_Z_MSB 		0x05
#define FXOS8700_OUT_Z_LSB 		0x06
#define FXOS8700_F_SETUP 		0x09
#define FXOS8700_TRIG_CFG 		0x0a
#define FXOS8700_SYSMOD			0x0B
#define FXOS8700_INT_SOURCE		0x0c
#define FXOS8700_WHO_AM_I		0x0d
#define FXOS8700_XYZ_DATA_CFG		0x0e
#define FXOS8700_HP_FILTER_CUTOFF	0x0f
#define FXOS8700_PL_STATUS 		0x10
#define FXOS8700_PL_CFG 		0x11
#define FXOS8700_PL_COUNT		0x12
#define FXOS8700_PL_BF_ZCOMP		0x13
#define FXOS8700_PL_P_L_THS_REG		0x14
#define FXOS8700_FFMT_CFG		0x15
#define FXOS8700_FFMT_SRC		0x16
#define FXOS8700_FFMT_THS		0x17
#define FXOS8700_FFMT_COUNT		0x18
#define FXOS8700_TRANSIDENT1_CFG	0x1d
#define FXOS8700_TRANSIDENT1_SRC	0x1e
#define FXOS8700_TRANSIDENT1_THS	0x1f
#define FXOS8700_TRANSIDENT1_COUNT	0x20
#define FXOS8700_PULSE_CFG		0x21
#define FXOS8700_PULSE_SRC		0x22
#define FXOS8700_PULSE_THSX		0x23
#define FXOS8700_PULSE_THSY		0x24
#define FXOS8700_PULSE_THSZ		0x25
#define FXOS8700_PULSE_TMLT		0x26
#define FXOS8700_PULSE_LTCY		0x27
#define FXOS8700_PULSE_WIND		0x28
#define FXOS8700_ATSLP_COUNT		0x29
#define FXOS8700_CTRL_REG1		0x2a
#define FXOS8700_CTRL_REG2		0x2b
#define FXOS8700_CTRL_REG3		0x2c
#define FXOS8700_CTRL_REG4		0x2d
#define FXOS8700_CTRL_REG5		0x2e
#define FXOS8700_OFF_X			0x2f
#define FXOS8700_OFF_Y			0x30
#define FXOS8700_OFF_Z			0x31
#define FXOS8700_M_DR_STATUS		0x32
#define FXOS8700_M_OUT_X_MSB       	0x33
#define FXOS8700_M_OUT_X_LSB       	0x34
#define FXOS8700_M_OUT_Y_MSB       	0x35
#define FXOS8700_M_OUT_Y_LSB       	0x36
#define FXOS8700_M_OUT_Z_MSB       	0x37
#define FXOS8700_M_OUT_Z_LSB       	0x38
#define FXOS8700_CMP_X_MSB       	0x39
#define FXOS8700_CMP_X_LSB       	0x3a
#define FXOS8700_CMP_Y_MSB       	0x3b
#define FXOS8700_CMP_Y_LSB       	0x3c
#define FXOS8700_CMP_Z_MSB       	0x3d
#define FXOS8700_CMP_Z_LSB       	0x3e
#define FXOS8700_M_OFF_X_MSB       	0x3f
#define FXOS8700_M_OFF_X_LSB       	0x40
#define FXOS8700_M_OFF_Y_MSB       	0x41
#define FXOS8700_M_OFF_Y_LSB       	0x42
#define FXOS8700_M_OFF_Z_MSB       	0x43
#define FXOS8700_M_OFF_Z_LSB       	0x44
#define FXOS8700_MAX_X_MSB       	0x45
#define FXOS8700_MAX_X_LSB      	0x46
#define FXOS8700_MAX_Y_MSB       	0x47
#define FXOS8700_MAX_Y_LSB       	0x48
#define FXOS8700_MAX_Z_MSB       	0x49
#define FXOS8700_MAX_Z_LSB       	0x4a
#define FXOS8700_MIN_X_MSB       	0x4b
#define FXOS8700_MIN_X_LSB       	0x4c
#define FXOS8700_MIN_Y_MSB       	0x4d
#define FXOS8700_MIN_Y_LSB       	0x4e
#define FXOS8700_MIN_Z_MSB       	0x4f
#define FXOS8700_MIN_Z_LSB       	0x50
#define FXOS8700_M_TEMP       		0x51
#define FXOS8700_MAG_THS_CFG 		0x52
#define FXOS8700_MAG_THS_SRC 		0x53
#define FXOS8700_MAG_THS_THS_X1 	0x54
#define FXOS8700_MAG_THS_THS_X0 	0x55
#define FXOS8700_MAG_THS_THS_Y1 	0x56
#define FXOS8700_MAG_THS_THS_Y0 	0x57
#define FXOS8700_MAG_THS_THS_Z1 	0x58
#define FXOS8700_MAG_THS_THS_Z0 	0x59
#define FXOS8700_MAG_THS_CUNT		0x5a
#define FXOS8700_M_CTRL_REG1		0x5b
#define FXOS8700_M_CTRL_REG2		0x5c
#define FXOS8700_M_CTRL_REG3		0x5d
#define FXOS8700_M_INT_SOURCE		0x5e
#define FXOS8700_G_VECM_CFG  		0x5f
#define FXOS8700_G_VECM_THS_MSB  	0x60
#define FXOS8700_G_VECM_THS_LSB  	0x61
#define FXOS8700_G_VECM_CNT  		0x62
#define FXOS8700_G_VECM_INITX_MSB  	0x63
#define FXOS8700_G_VECM_INITX_LSB  	0x64
#define FXOS8700_G_VECM_INITY_MSB  	0x65
#define FXOS8700_G_VECM_INITY_LSB  	0x66
#define FXOS8700_G_VECM_INITZ_MSB  	0x67
#define FXOS8700_G_VECM_INITZ_LSB  	0x68
#define FXOS8700_M_VECM_CFG  		0x69
#define FXOS8700_M_VECM_THS_MSB 	0x6a
#define FXOS8700_M_VECM_THS_LSB  	0x6b
#define FXOS8700_M_VECM_CNT  		0x6d
#define FXOS8700_M_VECM_INITX_MSB  	0x6d
#define FXOS8700_M_VECM_INITX_LSB  	0x6e
#define FXOS8700_M_VECM_INITY_MSB  	0x6f
#define FXOS8700_M_VECM_INITY_LSB  	0x70
#define FXOS8700_M_VECM_INITZ_MSB  	0x71
#define FXOS8700_M_VECM_INITZ_LSB  	0x72
#define FXOS8700_G_FFMT_THS_X1  	0x73
#define FXOS8700_G_FFMT_THS_X0 		0x74
#define FXOS8700_G_FFMT_THS_Y1  	0x75
#define FXOS8700_G_FFMT_THS_Y0  	0x76
#define FXOS8700_G_FFMT_THS_Z1  	0x77
#define FXOS8700_G_FFMT_THS_Z0  	0x78
#define FXOS8700_G_TRAN_INIT_MSB  	0x79
#define FXOS8700_G_TRAN_INIT_LSB_X 	0x7a
#define FXOS8700_G_TRAN_INIT_LSB_Y 	0x7b
#define FXOS8700_G_TRAN_INIT_LSB_Z 	0x7d
#define FXOS8700_TM_NVM_LOCK 		0x7e
#define FXOS8700_NVM_DATA0_35		0x80
#define FXOS8700_NVM_DATA_BNK3		0xa4
#define FXOS8700_NVM_DATA_BNK2		0xa5
#define FXOS8700_NVM_DATA_BNK1		0xa6
#define FXOS8700_NVM_DATA_BNK0		0xa7

#define	SENSOR_IOCTL_BASE		'S'
#define	SENSOR_GET_MODEL_NAME		_IOR(SENSOR_IOCTL_BASE, 0, char *)
#define	SENSOR_GET_POWER_STATUS		_IOR(SENSOR_IOCTL_BASE, 2, int)
#define	SENSOR_SET_POWER_STATUS		_IOR(SENSOR_IOCTL_BASE, 3, int)
#define	SENSOR_GET_DELAY_TIME		_IOR(SENSOR_IOCTL_BASE, 4, int)
#define	SENSOR_SET_DELAY_TIME		_IOR(SENSOR_IOCTL_BASE, 5, int)
#define	SENSOR_GET_RAW_DATA		_IOR(SENSOR_IOCTL_BASE, 6, short[3])

#define FXOS8700_I2C_ADDR		0x1E
#define FXOS8700_DEVICE_ID		0xC7
#define FXOS8700_PRE_DEVICE_ID 		0xC4
#define FXOS8700_DATA_BUF_SIZE		6
#define FXOS8700_DELAY_DEFAULT		200 	/* msecs */
#define FXOS8700_POSITION_DEFAULT	1 	/* msecs */

#define FXOS8700_TYPE_ACC 	0x00
#define FXOS8700_TYPE_MAG 	0x01
#define FXOS8700_STANDBY 	0x00
#define FXOS8700_ACTIVED 	0x01

#define ABS_STATUS		ABS_WHEEL
#define FXOS8700_DRIVER		"fxos8700"

#define ABSMAX_ACC_VAL          0x01FF
#define ABSMIN_ACC_VAL          -(ABSMAX_ACC_VAL)
#define FXOS8700_POLL_INTERVAL	400
#define FXOS8700_POLL_MAX	800
#define FXOS8700_POLL_MIN	100

enum { MODE_2G = 0, MODE_4G, MODE_8G,
};

struct fxos8700_data_axis {
	short x;
	short y;
	short z;
};

struct fxos8700_data {
	struct i2c_client *client;
	struct input_polled_dev *input_polled;
	struct miscdevice *acc_miscdev;
	struct miscdevice *mag_miscdev;
	atomic_t acc_delay;
	atomic_t mag_delay;
	atomic_t acc_active;
	atomic_t acc_active_poll;
	atomic_t mag_active_poll;
	atomic_t mag_active;
	atomic_t position;
	atomic_t range;
};

static struct fxos8700_data *g_fxos8700_data;
static int fxos8700_position_settings[8][3][3] = {
	{ { 0, -1, 0}, { 1, 0, 0}, {0, 0, 1} },
	{ {-1, 0, 0}, { 0, -1, 0}, {0, 0, 1} },
	{ { 0, 1, 0}, {-1, 0, 0}, {0, 0, 1} },
	{ { 1, 0, 0}, { 0, 1, 0}, {0, 0, 1} },
	{ { 0, -1, 0}, {-1, 0, 0}, {0, 0, -1} },
	{ {-1, 0, 0}, { 0, 1, 0}, {0, 0, -1} },
	{ { 0, 1, 0}, { 1, 0, 0}, {0, 0, -1} },
	{ { 1, 0, 0}, { 0, -1, 0}, {0, 0, -1} },
};

static int fxos8700_data_convert(struct fxos8700_data_axis *axis_data, int position)
{
	short rawdata[3], data[3];
	int i, j;
	if (position < 0 || position > 7)
		position = 0;
	rawdata[0] = axis_data->x;
	rawdata[1] = axis_data->y;
	rawdata[2] = axis_data->z;
	for (i = 0; i < 3 ; i++) {
		data[i] = 0;
		for (j = 0; j < 3; j++)
			data[i] += rawdata[j] * fxos8700_position_settings[position][i][j];
	}

	axis_data->x = data[0];
	axis_data->y = data[1];
	axis_data->z = data[2];
	return 0;
}

static int fxos8700_change_mode(struct i2c_client *client, int type, int active)
{
	u8 data;
	int acc_act, mag_act;
	struct fxos8700_data *pdata =  i2c_get_clientdata(client);

	acc_act = atomic_read(&pdata->acc_active);
	mag_act = atomic_read(&pdata->mag_active);
	data = i2c_smbus_read_byte_data(client, FXOS8700_CTRL_REG1);
	if (type == FXOS8700_TYPE_ACC)
		acc_act = active;
	else
		mag_act = active;
	if (acc_act ==  FXOS8700_ACTIVED || mag_act == FXOS8700_ACTIVED)
		data |= 0x01;
	else
		data &= ~0x01;
	i2c_smbus_write_byte_data(client, FXOS8700_CTRL_REG1, data);

	return 0;
}

static int fxos8700_change_range(struct i2c_client *client, int range)
{
	int ret;

	ret = i2c_smbus_write_byte_data(client, FXOS8700_XYZ_DATA_CFG, range);

	return ret;
}
static int fxos8700_set_odr(struct i2c_client *client, int type, int delay)
{
	return 0;
}

static int fxos8700_device_init(struct i2c_client *client)
{
	int result;
	struct fxos8700_data *pdata =  i2c_get_clientdata(client);

	/* standby mode */
	result = i2c_smbus_write_byte_data(client, FXOS8700_CTRL_REG1, 0x00);
	if (result < 0)
		goto out;
	result = i2c_smbus_write_byte_data(client, FXOS8700_M_CTRL_REG1, 0x1F);
	if (result < 0)
		goto out;
	result = i2c_smbus_write_byte_data(client, FXOS8700_M_CTRL_REG2, 0x5c);
	if (result < 0)
		goto out;
	result = i2c_smbus_write_byte_data(client, FXOS8700_CTRL_REG1, 0x03 << 3);
	if (result < 0)
		goto out;
	result = i2c_smbus_write_byte_data(client, FXOS8700_XYZ_DATA_CFG,
					   MODE_2G);
	if (result < 0)
		goto out;

	atomic_set(&pdata->acc_active, FXOS8700_STANDBY);
	atomic_set(&pdata->mag_active, FXOS8700_STANDBY);
	atomic_set(&pdata->position, FXOS8700_POSITION_DEFAULT);
	atomic_set(&pdata->range, MODE_2G);
	return 0;
out:
	dev_err(&client->dev, "Error when init fxos8700 device:(%d)", result);
	return result;
}

static int fxos8700_device_stop(struct i2c_client *client)
{
	i2c_smbus_write_byte_data(client, FXOS8700_CTRL_REG1, 0x00);
	return 0;
}

static int
fxos8700_read_data(struct i2c_client *client, struct fxos8700_data_axis *data, int type)
{
	u8 tmp_data[FXOS8700_DATA_BUF_SIZE];
	int ret;
	u8 reg;

	if (type == FXOS8700_TYPE_ACC)
		reg = FXOS8700_OUT_X_MSB;
	else
		reg = FXOS8700_M_OUT_X_MSB;

	ret = i2c_smbus_read_i2c_block_data(client, reg, FXOS8700_DATA_BUF_SIZE, tmp_data);
	if (ret < FXOS8700_DATA_BUF_SIZE) {
		dev_err(&client->dev, "i2c block read %s failed\n",
			(type == FXOS8700_TYPE_ACC ? "acc" : "mag"));
		return -EIO;
	}
	data->x = ((tmp_data[0] << 8) & 0xff00) | tmp_data[1];
	data->y = ((tmp_data[2] << 8) & 0xff00) | tmp_data[3];
	data->z = ((tmp_data[4] << 8) & 0xff00) | tmp_data[5];
	return 0;
}

static long fxos8700_acc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct fxos8700_data *pdata = file->private_data;
	void __user *argp = (void __user *)arg;
	struct fxos8700_data_axis data;
	long ret = 0;
	short sdata[3];
	int enable;
	int delay;
	int position;

	if (!pdata) {
		printk(KERN_ERR "fxos8700 struct datt point is NULL.");
		return -EFAULT;
	}

	switch (cmd) {
	case SENSOR_GET_MODEL_NAME:
		if (copy_to_user(argp, "FXOS8700 ACC", strlen("FXOS8700 ACC") + 1)) {
			printk(KERN_ERR "SENSOR_GET_MODEL_NAME copy_to_user failed.");
			ret = -EFAULT;
		}
		break;
	case SENSOR_GET_POWER_STATUS:
		enable = atomic_read(&pdata->acc_active);
		if (copy_to_user(argp, &enable, sizeof(int))) {
			printk(KERN_ERR "SENSOR_SET_POWER_STATUS copy_to_user failed.");
			ret = -EFAULT;
		}
		break;
	case SENSOR_SET_POWER_STATUS:
		if (copy_from_user(&enable, argp, sizeof(int))) {
			printk(KERN_ERR "SENSOR_SET_POWER_STATUS copy_to_user failed.");
			ret = -EFAULT;
		}
		if (pdata->client) {
			ret = fxos8700_change_mode(pdata->client, FXOS8700_TYPE_ACC,
						   enable ? FXOS8700_ACTIVED : FXOS8700_STANDBY);
			if (!ret)
				atomic_set(&pdata->acc_active, enable);
		}
		break;
	case SENSOR_GET_DELAY_TIME:
		delay = atomic_read(&pdata->acc_delay);
		if (copy_to_user(argp, &delay, sizeof(delay))) {
			printk(KERN_ERR "SENSOR_GET_DELAY_TIME copy_to_user failed.");
			return -EFAULT;
		}
		break;
	case SENSOR_SET_DELAY_TIME:
		if (copy_from_user(&delay, argp, sizeof(int))) {
			printk(KERN_ERR "SENSOR_SET_DELAY_TIME copy_to_user failed.");
			ret = -EFAULT;
		}
		if (pdata->client && delay > 0 && delay <= 500) {
			ret = fxos8700_set_odr(pdata->client, FXOS8700_TYPE_ACC, delay);
			if (!ret)
				atomic_set(&pdata->acc_delay, delay);
		}
		break;
	case SENSOR_GET_RAW_DATA:
		position = atomic_read(&pdata->position);
		ret = fxos8700_read_data(pdata->client, &data, FXOS8700_TYPE_ACC);
		if (!ret) {
			fxos8700_data_convert(&data, position);
			sdata[0] = data.x;
			sdata[1] = data.y;
			sdata[2] = data.z;
			if (copy_to_user(argp, sdata, sizeof(sdata))) {
				printk(KERN_ERR "SENSOR_GET_RAW_DATA copy_to_user failed.");
				ret = -EFAULT;
			}
		}
		break;
	default:
		ret = -1;
	}
	return ret;
}

static int fxos8700_acc_open(struct inode *inode, struct file *file)
{
	file->private_data = g_fxos8700_data;
	return nonseekable_open(inode, file);
}

static int fxos8700_acc_release(struct inode *inode, struct file *file)
{
	/* note: releasing the wdt in NOWAYOUT-mode does not stop it */
	return 0;
}

static const struct file_operations fxos8700_acc_fops = {
	.owner = THIS_MODULE,
	.open = fxos8700_acc_open,
	.release = fxos8700_acc_release,
	.unlocked_ioctl = fxos8700_acc_ioctl,
};

/* mag char miscdevice */
static long fxos8700_mag_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct fxos8700_data *pdata = file->private_data;
	void __user *argp = (void __user *)arg;
	struct fxos8700_data_axis data;
	long ret = 0;
	short sdata[3];
	int enable;
	int delay;
	int position;

	if (!pdata) {
		printk(KERN_ERR "fxos8700 struct datt point is NULL.");
		return -EFAULT;
	}

	switch (cmd) {
	case SENSOR_GET_MODEL_NAME:
		if (copy_to_user(argp, "FXOS8700 MAG", strlen("FXOS8700 MAG") + 1)) {
			printk(KERN_ERR "SENSOR_GET_MODEL_NAME copy_to_user failed.");
			ret = -EFAULT;
		}
		break;
	case SENSOR_GET_POWER_STATUS:
		enable = atomic_read(&pdata->mag_active);
		if (copy_to_user(argp, &enable, sizeof(int))) {
			printk(KERN_ERR "SENSOR_SET_POWER_STATUS copy_to_user failed.");
			ret = -EFAULT;
		}
		break;
	case SENSOR_SET_POWER_STATUS:
		if (copy_from_user(&enable, argp, sizeof(int))) {
			printk(KERN_ERR "SENSOR_SET_POWER_STATUS copy_to_user failed.");
			ret = -EFAULT;
		}
		if (pdata->client) {
			ret = fxos8700_change_mode(pdata->client, FXOS8700_TYPE_MAG,
						   enable ? FXOS8700_ACTIVED : FXOS8700_STANDBY);
			if (!ret)
				atomic_set(&pdata->mag_active, enable);
		}
		break;
	case SENSOR_GET_DELAY_TIME:
		delay = atomic_read(&pdata->mag_delay);
		if (copy_to_user(argp, &delay, sizeof(delay))) {
			printk(KERN_ERR "SENSOR_GET_DELAY_TIME copy_to_user failed.");
			return -EFAULT;
		}
		break;
	case SENSOR_SET_DELAY_TIME:
		if (copy_from_user(&delay, argp, sizeof(int))) {
			printk(KERN_ERR "SENSOR_SET_DELAY_TIME copy_to_user failed.");
			ret = -EFAULT;
		}
		if (pdata->client && delay > 0 && delay <= 500) {
			ret = fxos8700_set_odr(pdata->client, FXOS8700_TYPE_MAG, delay);
			if (!ret)
				atomic_set(&pdata->mag_delay, delay);
		}
		break;
	case SENSOR_GET_RAW_DATA:
		position = atomic_read(&pdata->position);
		ret = fxos8700_read_data(pdata->client, &data, FXOS8700_TYPE_MAG);
		if (!ret) {
			fxos8700_data_convert(&data, position);
			sdata[0] = data.x;
			sdata[1] = data.y;
			sdata[2] = data.z;
			if (copy_to_user(argp, sdata, sizeof(sdata))) {
				printk(KERN_ERR "SENSOR_GET_RAW_DATA copy_to_user failed.");
				ret = -EFAULT;
			}
		}
		break;
	default:
		ret = -1;
	}
	return ret;
}

static int fxos8700_mag_open(struct inode *inode, struct file *file)
{
	file->private_data = g_fxos8700_data;
	return nonseekable_open(inode, file);
}

static int fxos8700_mag_release(struct inode *inode, struct file *file)
{
	/* note: releasing the wdt in NOWAYOUT-mode does not stop it */
	return 0;
}

static const struct file_operations fxos8700_mag_fops = {
	.owner = THIS_MODULE,
	.open = fxos8700_mag_open,
	.release = fxos8700_mag_release,
	.unlocked_ioctl = fxos8700_mag_ioctl,
};

static struct miscdevice fxos8700_acc_device = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "FreescaleAccelerometer",
	.fops = &fxos8700_acc_fops,
};

static struct miscdevice fxos8700_mag_device = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "FreescaleMagnetometer",
	.fops = &fxos8700_mag_fops,
};

static ssize_t fxos8700_enable_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct miscdevice *misc_dev = dev_get_drvdata(dev);
	struct fxos8700_data *pdata = g_fxos8700_data;
	int enable = 0;

	if (pdata->acc_miscdev == misc_dev)
		enable = atomic_read(&pdata->acc_active);
	if (pdata->mag_miscdev == misc_dev)
		enable = atomic_read(&pdata->mag_active);

	return sprintf(buf, "%d\n", enable);
}

static ssize_t fxos8700_enable_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	struct miscdevice *misc_dev = dev_get_drvdata(dev);
	struct fxos8700_data *pdata = g_fxos8700_data;
	struct i2c_client *client = pdata->client;
	unsigned long enable;
	int type;
	int ret;

	if (kstrtoul(buf, 10, &enable) < 0)
		return -EINVAL;

	if (misc_dev == pdata->acc_miscdev)
		type = FXOS8700_TYPE_ACC;
	if (misc_dev == pdata->mag_miscdev)
		type = FXOS8700_TYPE_MAG;
	enable = (enable > 0 ? FXOS8700_ACTIVED : FXOS8700_STANDBY);
	ret = fxos8700_change_mode(client, type, enable);
	if (!ret) {
		if (type == FXOS8700_TYPE_ACC) {
			atomic_set(&pdata->acc_active, enable);
			atomic_set(&pdata->acc_active_poll, enable);
		} else {
			atomic_set(&pdata->mag_active, enable);
			atomic_set(&pdata->mag_active_poll, enable);
		}
	}
	return count;
}

static ssize_t fxos8700_poll_delay_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct miscdevice *misc_dev = dev_get_drvdata(dev);
	struct fxos8700_data *pdata = g_fxos8700_data;
	int poll_delay = 0;

	if (pdata->acc_miscdev == misc_dev)
		poll_delay = atomic_read(&pdata->acc_delay);
	if (pdata->mag_miscdev == misc_dev)
		poll_delay = atomic_read(&pdata->mag_delay);

	return sprintf(buf, "%d\n", poll_delay);
}


static ssize_t fxos8700_poll_delay_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	struct miscdevice *misc_dev = dev_get_drvdata(dev);
	struct fxos8700_data *pdata = g_fxos8700_data;
	struct i2c_client *client = pdata->client;
	unsigned long delay;
	int type;
	int ret;

	if (kstrtoul(buf, 10, &delay) < 0)
		return -EINVAL;

	if (misc_dev == pdata->acc_miscdev)
		type = FXOS8700_TYPE_ACC;
	if (misc_dev == pdata->mag_miscdev)
		type = FXOS8700_TYPE_MAG;
	ret = fxos8700_set_odr(client, type, delay);
	if (!ret) {
		if (type == FXOS8700_TYPE_ACC)
			atomic_set(&pdata->acc_delay, delay);
		else
			atomic_set(&pdata->mag_delay, delay);
	}
	return count;
}

static ssize_t fxos8700_position_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct fxos8700_data *pdata = g_fxos8700_data;
	unsigned long position = atomic_read(&pdata->position);

	return sprintf(buf, "%ld\n", position);
}

static ssize_t fxos8700_position_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	unsigned long position;
	struct fxos8700_data *pdata = g_fxos8700_data;

	if (kstrtoul(buf, 10, &position) < 0)
		return -EINVAL;

	atomic_set(&pdata->position, position);
	return count;
}

static ssize_t fxos8700_range_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct fxos8700_data *pdata = g_fxos8700_data;
	unsigned long range = atomic_read(&pdata->range);

	return sprintf(buf, "%ld\n", range);
}

static ssize_t fxos8700_range_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	unsigned long range;
	struct fxos8700_data *pdata = g_fxos8700_data;
	struct i2c_client *client = pdata->client;
	int ret;

	if (kstrtoul(buf, 10, &range) < 0)
		return -EINVAL;

	if (range == atomic_read(&pdata->range))
		return count;

	if (atomic_read(&pdata->acc_active) | atomic_read(&pdata->mag_active))
		printk(KERN_INFO "Pls set the sensor standby and then actived\n");
	ret = fxos8700_change_range(client, range);
	if (!ret)
		atomic_set(&pdata->range, range);

	return count;
}

static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO, fxos8700_enable_show, fxos8700_enable_store);
static DEVICE_ATTR(poll_delay, S_IWUSR | S_IRUGO, fxos8700_poll_delay_show, fxos8700_poll_delay_store);
static DEVICE_ATTR(position, S_IWUSR | S_IRUGO, fxos8700_position_show, fxos8700_position_store);
static DEVICE_ATTR(range, S_IWUSR | S_IRUGO, fxos8700_range_show, fxos8700_range_store);

static struct attribute *fxos8700_attributes[] = {
	&dev_attr_enable.attr,
	&dev_attr_poll_delay.attr,
	&dev_attr_position.attr,
	&dev_attr_range.attr,
	NULL
};

static const struct attribute_group fxos8700_attr_group = {
	.attrs = fxos8700_attributes,
};

static int fxos8700_register_sysfs_device(struct fxos8700_data *pdata)
{
	struct miscdevice *misc_dev = NULL;
	int err = -1;

	/* register sysfs for acc */
	misc_dev = pdata->acc_miscdev;
	err = sysfs_create_group(&misc_dev->this_device->kobj, &fxos8700_attr_group);
	if (err)
		goto out;

	/* register sysfs for mag */
	misc_dev = pdata->mag_miscdev;
	err = sysfs_create_group(&misc_dev->this_device->kobj, &fxos8700_attr_group);
	if (err)
		goto err_register_sysfs;
	return 0;
err_register_sysfs:
	misc_dev = pdata->acc_miscdev;
	sysfs_remove_group(&misc_dev->this_device->kobj, &fxos8700_attr_group);
	printk("reigster mag sysfs error\n");
out:
	printk("reigster acc sysfs error\n");
	return err;
}

static int fxos8700_unregister_sysfs_device(struct fxos8700_data *pdata)
{
	struct miscdevice *misc_dev;
	misc_dev =  pdata->acc_miscdev;
	sysfs_remove_group(&misc_dev->this_device->kobj, &fxos8700_attr_group);

	misc_dev = pdata->mag_miscdev;
	sysfs_remove_group(&misc_dev->this_device->kobj, &fxos8700_attr_group);
	return 0;
}

static void fxos8700_report(struct input_polled_dev *dev, int type)
{
	struct fxos8700_data_axis data;
	struct fxos8700_data *pdata = g_fxos8700_data;
	struct input_dev *idev = pdata->input_polled->input;
	int position;
	int ret;

	position = atomic_read(&pdata->position);
	ret = fxos8700_read_data(pdata->client, &data, type);
	if (!ret) {
		fxos8700_data_convert(&data, position);
		input_report_abs(idev, ABS_X, data.x);
		input_report_abs(idev, ABS_Y, data.y);
		input_report_abs(idev, ABS_Z, data.z);
		input_sync(idev);
	}
}

static void fxos8700_poll(struct input_polled_dev *dev)
{
	struct fxos8700_data *pdata = g_fxos8700_data;
	int type;

	if (!(atomic_read(&pdata->acc_active_poll) ||
	    atomic_read(&pdata->mag_active_poll)))
		return;

	if (atomic_read(&pdata->acc_active_poll))
		type = FXOS8700_TYPE_ACC;
	if (atomic_read(&pdata->mag_active_poll))
		type =FXOS8700_TYPE_MAG;
	fxos8700_report(dev, type);
}

static int fxo8700_register_polled_device(struct fxos8700_data *pdata)
{
	struct input_polled_dev *ipoll_dev;
	struct input_dev *idev;
	int error;

	ipoll_dev = input_allocate_polled_device();
	if (!ipoll_dev)
		return -ENOMEM;

	ipoll_dev->private = pdata;
	ipoll_dev->poll = fxos8700_poll;
	ipoll_dev->poll_interval = FXOS8700_POLL_INTERVAL;
	ipoll_dev->poll_interval_min = FXOS8700_POLL_MIN;
	ipoll_dev->poll_interval_max = FXOS8700_POLL_MAX;
	idev = ipoll_dev->input;
	idev->name = FXOS8700_DRIVER;
	idev->id.bustype = BUS_I2C;
	idev->dev.parent = &pdata->client->dev;

	idev->evbit[0] = BIT_MASK(EV_ABS);
	input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
	input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
	input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);

	error = input_register_polled_device(ipoll_dev);
	if (error) {
		input_free_polled_device(ipoll_dev);
		return error;
	}

	pdata->input_polled = ipoll_dev;

	return 0;
}

static int fxos8700_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	int result, client_id;
	struct fxos8700_data *pdata;
	struct i2c_adapter *adapter;

	adapter = to_i2c_adapter(client->dev.parent);
	result = i2c_check_functionality(adapter,
					 I2C_FUNC_SMBUS_BYTE |
					 I2C_FUNC_SMBUS_BYTE_DATA);
	if (!result)
		goto err_out;

	client_id = i2c_smbus_read_byte_data(client, FXOS8700_WHO_AM_I);
	if (client_id !=  FXOS8700_DEVICE_ID && client_id != FXOS8700_PRE_DEVICE_ID) {
		dev_err(&client->dev,
			"read chip ID 0x%x is not equal to 0x%x or 0x%x\n",
			result, FXOS8700_DEVICE_ID, FXOS8700_PRE_DEVICE_ID);
		result = -EINVAL;
		goto err_out;
	}
	pdata = kzalloc(sizeof(struct fxos8700_data), GFP_KERNEL);
	if (!pdata) {
		result = -ENOMEM;
		dev_err(&client->dev, "alloc data memory error!\n");
		goto err_out;
	}
	g_fxos8700_data = pdata;
	pdata->client = client;
	atomic_set(&pdata->acc_delay, FXOS8700_DELAY_DEFAULT);
	atomic_set(&pdata->mag_delay, FXOS8700_DELAY_DEFAULT);
	i2c_set_clientdata(client, pdata);

	result = misc_register(&fxos8700_acc_device);
	if (result != 0) {
		printk(KERN_ERR "register acc miscdevice error");
		goto err_regsiter_acc_misc;
	}
	pdata->acc_miscdev = &fxos8700_acc_device;

	result = misc_register(&fxos8700_mag_device);
	if (result != 0) {
		printk(KERN_ERR "register acc miscdevice error");
		goto err_regsiter_mag_misc;
	}
	pdata->mag_miscdev = &fxos8700_mag_device;

	/* for debug */
	if (client->irq <= 0) {
		result = fxo8700_register_polled_device(g_fxos8700_data);
		if (result)
			dev_err(&client->dev,
				"IRQ GPIO conf. error %d, error %d\n",
				client->irq, result);
	}

	result = fxos8700_register_sysfs_device(pdata);
	if (result) {
		dev_err(&client->dev, "create device file failed!\n");
		result = -EINVAL;
		goto err_register_sys;
	}
	fxos8700_device_init(client);
	printk("fxos8700 device driver probe successfully");
	return 0;
err_register_sys:
	misc_deregister(&fxos8700_mag_device);
	pdata->mag_miscdev = NULL;
err_regsiter_mag_misc:
	misc_deregister(&fxos8700_acc_device);
	pdata->acc_miscdev = NULL;
err_regsiter_acc_misc:
	i2c_set_clientdata(client, NULL);
	kfree(pdata);
err_out:
	return result;
}

static int fxos8700_remove(struct i2c_client *client)
{
	struct fxos8700_data *pdata =  i2c_get_clientdata(client);
	if (!pdata)
		return 0;
	fxos8700_device_stop(client);
	if (client->irq <= 0) {
		input_unregister_polled_device(pdata->input_polled);
		input_free_polled_device(pdata->input_polled);
	}
	fxos8700_unregister_sysfs_device(pdata);
	misc_deregister(&fxos8700_acc_device);
	misc_deregister(&fxos8700_mag_device);
	kfree(pdata);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int fxos8700_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct fxos8700_data *pdata = i2c_get_clientdata(client);
	if (atomic_read(&pdata->acc_active) || atomic_read(&pdata->mag_active))
		fxos8700_device_stop(client);
	return 0;
}

static int fxos8700_resume(struct device *dev)
{
    int ret = 0;
	struct i2c_client *client = to_i2c_client(dev);
	struct fxos8700_data *pdata =  i2c_get_clientdata(client);
	if (atomic_read(&pdata->acc_active))
		fxos8700_change_mode(client, FXOS8700_TYPE_ACC, FXOS8700_ACTIVED);
	if (atomic_read(&pdata->mag_active))
		fxos8700_change_mode(client, FXOS8700_TYPE_MAG, FXOS8700_ACTIVED);
	return ret;
}
#endif

static const struct i2c_device_id fxos8700_id[] = {
	{"fxos8700", 0},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, fxos8700_id);

static SIMPLE_DEV_PM_OPS(fxos8700_pm_ops, fxos8700_suspend, fxos8700_resume);
static struct i2c_driver fxos8700_driver = {
	.driver = {
		   .name = FXOS8700_DRIVER,
		   .owner = THIS_MODULE,
		   .pm = &fxos8700_pm_ops,
		   },
	.probe = fxos8700_probe,
	.remove = fxos8700_remove,
	.id_table = fxos8700_id,
};

module_i2c_driver(fxos8700_driver);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("FXOS8700 6-Axis Acc and Mag Combo Sensor driver");
MODULE_LICENSE("GPL");