/*
	$License:
	Copyright (C) 2011 InvenSense Corporation, 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, see <http://www.gnu.org/licenses/>.
	$
 */

/**
 *  @addtogroup ACCELDL
 *  @brief      Accelerometer setup and handling methods for Kionix KXTF9.
 *
 *  @{
 *      @file   kxtf9.c
 *      @brief  Accelerometer setup and handling methods for Kionix KXTF9.
*/

/* -------------------------------------------------------------------------- */

#undef MPL_LOG_NDEBUG
#define MPL_LOG_NDEBUG 1

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "mpu-dev.h"

#include <log.h>
#include <linux/mpu.h>
#include "mlsl.h"
#include "mldl_cfg.h"
#undef MPL_LOG_TAG
#define MPL_LOG_TAG "MPL-acc"

#define KXTF9_XOUT_HPF_L                (0x00)	/* 0000 0000 */
#define KXTF9_XOUT_HPF_H                (0x01)	/* 0000 0001 */
#define KXTF9_YOUT_HPF_L                (0x02)	/* 0000 0010 */
#define KXTF9_YOUT_HPF_H                (0x03)	/* 0000 0011 */
#define KXTF9_ZOUT_HPF_L                (0x04)	/* 0001 0100 */
#define KXTF9_ZOUT_HPF_H                (0x05)	/* 0001 0101 */
#define KXTF9_XOUT_L                    (0x06)	/* 0000 0110 */
#define KXTF9_XOUT_H                    (0x07)	/* 0000 0111 */
#define KXTF9_YOUT_L                    (0x08)	/* 0000 1000 */
#define KXTF9_YOUT_H                    (0x09)	/* 0000 1001 */
#define KXTF9_ZOUT_L                    (0x0A)	/* 0001 1010 */
#define KXTF9_ZOUT_H                    (0x0B)	/* 0001 1011 */
#define KXTF9_ST_RESP                   (0x0C)	/* 0000 1100 */
#define KXTF9_WHO_AM_I                  (0x0F)	/* 0000 1111 */
#define KXTF9_TILT_POS_CUR              (0x10)	/* 0001 0000 */
#define KXTF9_TILT_POS_PRE              (0x11)	/* 0001 0001 */
#define KXTF9_INT_SRC_REG1              (0x15)	/* 0001 0101 */
#define KXTF9_INT_SRC_REG2              (0x16)	/* 0001 0110 */
#define KXTF9_STATUS_REG                (0x18)	/* 0001 1000 */
#define KXTF9_INT_REL                   (0x1A)	/* 0001 1010 */
#define KXTF9_CTRL_REG1                 (0x1B)	/* 0001 1011 */
#define KXTF9_CTRL_REG2                 (0x1C)	/* 0001 1100 */
#define KXTF9_CTRL_REG3                 (0x1D)	/* 0001 1101 */
#define KXTF9_INT_CTRL_REG1             (0x1E)	/* 0001 1110 */
#define KXTF9_INT_CTRL_REG2             (0x1F)	/* 0001 1111 */
#define KXTF9_INT_CTRL_REG3             (0x20)	/* 0010 0000 */
#define KXTF9_DATA_CTRL_REG             (0x21)	/* 0010 0001 */
#define KXTF9_TILT_TIMER                (0x28)	/* 0010 1000 */
#define KXTF9_WUF_TIMER                 (0x29)	/* 0010 1001 */
#define KXTF9_TDT_TIMER                 (0x2B)	/* 0010 1011 */
#define KXTF9_TDT_H_THRESH              (0x2C)	/* 0010 1100 */
#define KXTF9_TDT_L_THRESH              (0x2D)	/* 0010 1101 */
#define KXTF9_TDT_TAP_TIMER             (0x2E)	/* 0010 1110 */
#define KXTF9_TDT_TOTAL_TIMER           (0x2F)	/* 0010 1111 */
#define KXTF9_TDT_LATENCY_TIMER         (0x30)	/* 0011 0000 */
#define KXTF9_TDT_WINDOW_TIMER          (0x31)	/* 0011 0001 */
#define KXTF9_WUF_THRESH                (0x5A)	/* 0101 1010 */
#define KXTF9_TILT_ANGLE                (0x5C)	/* 0101 1100 */
#define KXTF9_HYST_SET                  (0x5F)	/* 0101 1111 */

#define KXTF9_MAX_DUR (0xFF)
#define KXTF9_MAX_THS (0xFF)
#define KXTF9_THS_COUNTS_P_G (32)

/* -------------------------------------------------------------------------- */

struct kxtf9_config {
	unsigned long odr;	/* Output data rate mHz */
	unsigned int fsr;	/* full scale range mg */
	unsigned int ths;	/* Motion no-motion thseshold mg */
	unsigned int dur;	/* Motion no-motion duration ms */
	unsigned int irq_type;
	unsigned char reg_ths;
	unsigned char reg_dur;
	unsigned char reg_odr;
	unsigned char reg_int_cfg1;
	unsigned char reg_int_cfg2;
	unsigned char ctrl_reg1;
};

struct kxtf9_private_data {
	struct kxtf9_config suspend;
	struct kxtf9_config resume;
};

static int kxtf9_set_ths(void *mlsl_handle,
			 struct ext_slave_platform_data *pdata,
			 struct kxtf9_config *config, int apply, long ths)
{
	int result = INV_SUCCESS;
	if ((ths * KXTF9_THS_COUNTS_P_G / 1000) > KXTF9_MAX_THS)
		ths = (long)(KXTF9_MAX_THS * 1000) / KXTF9_THS_COUNTS_P_G;

	if (ths < 0)
		ths = 0;

	config->ths = ths;
	config->reg_ths = (unsigned char)
	    ((long)(ths * KXTF9_THS_COUNTS_P_G) / 1000);
	MPL_LOGV("THS: %d, 0x%02x\n", config->ths, (int)config->reg_ths);
	if (apply)
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_WUF_THRESH,
						 config->reg_ths);
	return result;
}

static int kxtf9_set_dur(void *mlsl_handle,
			 struct ext_slave_platform_data *pdata,
			 struct kxtf9_config *config, int apply, long dur)
{
	int result = INV_SUCCESS;
	long reg_dur = (dur * config->odr) / 1000000L;
	config->dur = dur;

	if (reg_dur > KXTF9_MAX_DUR)
		reg_dur = KXTF9_MAX_DUR;

	config->reg_dur = (unsigned char)reg_dur;
	MPL_LOGV("DUR: %d, 0x%02x\n", config->dur, (int)config->reg_dur);
	if (apply)
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_WUF_TIMER,
						 (unsigned char)reg_dur);
	return result;
}

/**
 * Sets the IRQ to fire when one of the IRQ events occur.  Threshold and
 * duration will not be used uless the type is MOT or NMOT.
 *
 * @param config configuration to apply to, suspend or resume
 * @param irq_type The type of IRQ.  Valid values are
 * - MPU_SLAVE_IRQ_TYPE_NONE
 * - MPU_SLAVE_IRQ_TYPE_MOTION
 * - MPU_SLAVE_IRQ_TYPE_DATA_READY
 */
static int kxtf9_set_irq(void *mlsl_handle,
			 struct ext_slave_platform_data *pdata,
			 struct kxtf9_config *config, int apply, long irq_type)
{
	int result = INV_SUCCESS;
	struct kxtf9_private_data *private_data = pdata->private_data;

	config->irq_type = (unsigned char)irq_type;
	config->ctrl_reg1 &= ~0x22;
	if (irq_type == MPU_SLAVE_IRQ_TYPE_DATA_READY) {
		config->ctrl_reg1 |= 0x20;
		config->reg_int_cfg1 = 0x38;
		config->reg_int_cfg2 = 0x00;
	} else if (irq_type == MPU_SLAVE_IRQ_TYPE_MOTION) {
		config->ctrl_reg1 |= 0x02;
		if ((unsigned long)config ==
		    (unsigned long)&private_data->suspend)
			config->reg_int_cfg1 = 0x34;
		else
			config->reg_int_cfg1 = 0x24;
		config->reg_int_cfg2 = 0xE0;
	} else {
		config->reg_int_cfg1 = 0x00;
		config->reg_int_cfg2 = 0x00;
	}

	if (apply) {
		/* Must clear bit 7 before writing new configuration */
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_CTRL_REG1, 0x40);
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_INT_CTRL_REG1,
						 config->reg_int_cfg1);
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_INT_CTRL_REG2,
						 config->reg_int_cfg2);
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_CTRL_REG1,
						 config->ctrl_reg1);
	}
	MPL_LOGV("CTRL_REG1: %lx, INT_CFG1: %lx, INT_CFG2: %lx\n",
		 (unsigned long)config->ctrl_reg1,
		 (unsigned long)config->reg_int_cfg1,
		 (unsigned long)config->reg_int_cfg2);

	return result;
}

/**
 * Set the Output data rate for the particular configuration
 *
 * @param config Config to modify with new ODR
 * @param odr Output data rate in units of 1/1000Hz
 */
static int kxtf9_set_odr(void *mlsl_handle,
			 struct ext_slave_platform_data *pdata,
			 struct kxtf9_config *config, int apply, long odr)
{
	unsigned char bits;
	int result = INV_SUCCESS;

	/* Data sheet says there is 12.5 hz, but that seems to produce a single
	 * correct data value, thus we remove it from the table */
	if (odr > 400000L) {
		config->odr = 800000L;
		bits = 0x06;
	} else if (odr > 200000L) {
		config->odr = 400000L;
		bits = 0x05;
	} else if (odr > 100000L) {
		config->odr = 200000L;
		bits = 0x04;
	} else if (odr > 50000) {
		config->odr = 100000L;
		bits = 0x03;
	} else if (odr > 25000) {
		config->odr = 50000;
		bits = 0x02;
	} else if (odr != 0) {
		config->odr = 25000;
		bits = 0x01;
	} else {
		config->odr = 0;
		bits = 0;
	}

	if (odr != 0)
		config->ctrl_reg1 |= 0x80;
	else
		config->ctrl_reg1 &= ~0x80;

	config->reg_odr = bits;
	kxtf9_set_dur(mlsl_handle, pdata, config, apply, config->dur);
	MPL_LOGV("ODR: %ld, 0x%02x\n", config->odr, (int)config->ctrl_reg1);
	if (apply) {
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_DATA_CTRL_REG,
						 config->reg_odr);
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_CTRL_REG1, 0x40);
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_CTRL_REG1,
						 config->ctrl_reg1);
	}
	return result;
}

/**
 * Set the full scale range of the accels
 *
 * @param config pointer to configuration
 * @param fsr requested full scale range
 */
static int kxtf9_set_fsr(void *mlsl_handle,
			 struct ext_slave_platform_data *pdata,
			 struct kxtf9_config *config, int apply, long fsr)
{
	int result = INV_SUCCESS;

	config->ctrl_reg1 = (config->ctrl_reg1 & 0xE7);
	if (fsr <= 2000) {
		config->fsr = 2000;
		config->ctrl_reg1 |= 0x00;
	} else if (fsr <= 4000) {
		config->fsr = 4000;
		config->ctrl_reg1 |= 0x08;
	} else {
		config->fsr = 8000;
		config->ctrl_reg1 |= 0x10;
	}

	MPL_LOGV("FSR: %d\n", config->fsr);
	if (apply) {
		/* Must clear bit 7 before writing new configuration */
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_CTRL_REG1, 0x40);
		result = inv_serial_single_write(mlsl_handle, pdata->address,
						 KXTF9_CTRL_REG1,
						 config->ctrl_reg1);
	}
	return result;
}

static int kxtf9_suspend(void *mlsl_handle,
			 struct ext_slave_descr *slave,
			 struct ext_slave_platform_data *pdata)
{
	int result;
	unsigned char data;
	struct kxtf9_private_data *private_data = pdata->private_data;

	/* Wake up */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_CTRL_REG1, 0x40);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* INT_CTRL_REG1: */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_INT_CTRL_REG1,
					 private_data->suspend.reg_int_cfg1);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* WUF_THRESH: */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_WUF_THRESH,
					 private_data->suspend.reg_ths);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* DATA_CTRL_REG */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_DATA_CTRL_REG,
					 private_data->suspend.reg_odr);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* WUF_TIMER */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_WUF_TIMER,
					 private_data->suspend.reg_dur);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	/* Normal operation  */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_CTRL_REG1,
					 private_data->suspend.ctrl_reg1);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = inv_serial_read(mlsl_handle, pdata->address,
				 KXTF9_INT_REL, 1, &data);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	return result;
}

/* full scale setting - register and mask */
#define ACCEL_KIONIX_CTRL_REG      (0x1b)
#define ACCEL_KIONIX_CTRL_MASK     (0x18)

static int kxtf9_resume(void *mlsl_handle,
			struct ext_slave_descr *slave,
			struct ext_slave_platform_data *pdata)
{
	int result = INV_SUCCESS;
	unsigned char data;
	struct kxtf9_private_data *private_data = pdata->private_data;

	/* Wake up */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_CTRL_REG1, 0x40);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* INT_CTRL_REG1: */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_INT_CTRL_REG1,
					 private_data->resume.reg_int_cfg1);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* WUF_THRESH: */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_WUF_THRESH,
					 private_data->resume.reg_ths);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* DATA_CTRL_REG */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_DATA_CTRL_REG,
					 private_data->resume.reg_odr);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* WUF_TIMER */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_WUF_TIMER,
					 private_data->resume.reg_dur);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	/* Normal operation  */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_CTRL_REG1,
					 private_data->resume.ctrl_reg1);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = inv_serial_read(mlsl_handle, pdata->address,
				 KXTF9_INT_REL, 1, &data);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	return INV_SUCCESS;
}

static int kxtf9_init(void *mlsl_handle,
		      struct ext_slave_descr *slave,
		      struct ext_slave_platform_data *pdata)
{

	struct kxtf9_private_data *private_data;
	int result = INV_SUCCESS;

	private_data = (struct kxtf9_private_data *)
	    kzalloc(sizeof(struct kxtf9_private_data), GFP_KERNEL);

	if (!private_data)
		return INV_ERROR_MEMORY_EXAUSTED;

	/* RAM reset */
	/* Fastest Reset */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_CTRL_REG1, 0x40);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* Fastest Reset */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_DATA_CTRL_REG, 0x36);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	/* Reset */
	result = inv_serial_single_write(mlsl_handle, pdata->address,
					 KXTF9_CTRL_REG3, 0xcd);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	msleep(2);

	pdata->private_data = private_data;

	private_data->resume.ctrl_reg1 = 0xC0;
	private_data->suspend.ctrl_reg1 = 0x40;

	result = kxtf9_set_dur(mlsl_handle, pdata, &private_data->suspend,
			       false, 1000);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = kxtf9_set_dur(mlsl_handle, pdata, &private_data->resume,
			       false, 2540);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	result = kxtf9_set_odr(mlsl_handle, pdata, &private_data->suspend,
			       false, 50000);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = kxtf9_set_odr(mlsl_handle, pdata, &private_data->resume,
			       false, 200000L);

	result = kxtf9_set_fsr(mlsl_handle, pdata, &private_data->suspend,
			       false, 2000);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = kxtf9_set_fsr(mlsl_handle, pdata, &private_data->resume,
			       false, 2000);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	result = kxtf9_set_ths(mlsl_handle, pdata, &private_data->suspend,
			       false, 80);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = kxtf9_set_ths(mlsl_handle, pdata, &private_data->resume,
			       false, 40);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	result = kxtf9_set_irq(mlsl_handle, pdata, &private_data->suspend,
			       false, MPU_SLAVE_IRQ_TYPE_NONE);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	result = kxtf9_set_irq(mlsl_handle, pdata, &private_data->resume,
			       false, MPU_SLAVE_IRQ_TYPE_NONE);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	return result;
}

static int kxtf9_exit(void *mlsl_handle,
		      struct ext_slave_descr *slave,
		      struct ext_slave_platform_data *pdata)
{
	kfree(pdata->private_data);
	return INV_SUCCESS;
}

static int kxtf9_config(void *mlsl_handle,
			struct ext_slave_descr *slave,
			struct ext_slave_platform_data *pdata,
			struct ext_slave_config *data)
{
	struct kxtf9_private_data *private_data = pdata->private_data;
	if (!data->data)
		return INV_ERROR_INVALID_PARAMETER;

	switch (data->key) {
	case MPU_SLAVE_CONFIG_ODR_SUSPEND:
		return kxtf9_set_odr(mlsl_handle, pdata,
				     &private_data->suspend,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_ODR_RESUME:
		return kxtf9_set_odr(mlsl_handle, pdata,
				     &private_data->resume,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_FSR_SUSPEND:
		return kxtf9_set_fsr(mlsl_handle, pdata,
				     &private_data->suspend,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_FSR_RESUME:
		return kxtf9_set_fsr(mlsl_handle, pdata,
				     &private_data->resume,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_MOT_THS:
		return kxtf9_set_ths(mlsl_handle, pdata,
				     &private_data->suspend,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_NMOT_THS:
		return kxtf9_set_ths(mlsl_handle, pdata,
				     &private_data->resume,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_MOT_DUR:
		return kxtf9_set_dur(mlsl_handle, pdata,
				     &private_data->suspend,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_NMOT_DUR:
		return kxtf9_set_dur(mlsl_handle, pdata,
				     &private_data->resume,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_IRQ_SUSPEND:
		return kxtf9_set_irq(mlsl_handle, pdata,
				     &private_data->suspend,
				     data->apply, *((long *)data->data));
	case MPU_SLAVE_CONFIG_IRQ_RESUME:
		return kxtf9_set_irq(mlsl_handle, pdata,
				     &private_data->resume,
				     data->apply, *((long *)data->data));
	default:
		return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
	};

	return INV_SUCCESS;
}

static int kxtf9_get_config(void *mlsl_handle,
			    struct ext_slave_descr *slave,
			    struct ext_slave_platform_data *pdata,
			    struct ext_slave_config *data)
{
	struct kxtf9_private_data *private_data = pdata->private_data;
	if (!data->data)
		return INV_ERROR_INVALID_PARAMETER;

	switch (data->key) {
	case MPU_SLAVE_CONFIG_ODR_SUSPEND:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->suspend.odr;
		break;
	case MPU_SLAVE_CONFIG_ODR_RESUME:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->resume.odr;
		break;
	case MPU_SLAVE_CONFIG_FSR_SUSPEND:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->suspend.fsr;
		break;
	case MPU_SLAVE_CONFIG_FSR_RESUME:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->resume.fsr;
		break;
	case MPU_SLAVE_CONFIG_MOT_THS:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->suspend.ths;
		break;
	case MPU_SLAVE_CONFIG_NMOT_THS:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->resume.ths;
		break;
	case MPU_SLAVE_CONFIG_MOT_DUR:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->suspend.dur;
		break;
	case MPU_SLAVE_CONFIG_NMOT_DUR:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->resume.dur;
		break;
	case MPU_SLAVE_CONFIG_IRQ_SUSPEND:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->suspend.irq_type;
		break;
	case MPU_SLAVE_CONFIG_IRQ_RESUME:
		(*(unsigned long *)data->data) =
		    (unsigned long)private_data->resume.irq_type;
		break;
	default:
		return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
	};

	return INV_SUCCESS;
}

static int kxtf9_read(void *mlsl_handle,
		      struct ext_slave_descr *slave,
		      struct ext_slave_platform_data *pdata,
		      unsigned char *data)
{
	int result;
	unsigned char reg;
	result = inv_serial_read(mlsl_handle, pdata->address,
				 KXTF9_INT_SRC_REG2, 1, &reg);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}

	if (!(reg & 0x10))
		return INV_ERROR_ACCEL_DATA_NOT_READY;

	result = inv_serial_read(mlsl_handle, pdata->address,
				 slave->read_reg, slave->read_len, data);
	if (result) {
		LOG_RESULT_LOCATION(result);
		return result;
	}
	return result;
}

static struct ext_slave_descr kxtf9_descr = {
	.init             = kxtf9_init,
	.exit             = kxtf9_exit,
	.suspend          = kxtf9_suspend,
	.resume           = kxtf9_resume,
	.read             = kxtf9_read,
	.config           = kxtf9_config,
	.get_config       = kxtf9_get_config,
	.name             = "kxtf9",
	.type             = EXT_SLAVE_TYPE_ACCEL,
	.id               = ACCEL_ID_KXTF9,
	.read_reg         = 0x06,
	.read_len         = 6,
	.endian           = EXT_SLAVE_LITTLE_ENDIAN,
	.range            = {2, 0},
	.trigger          = NULL,
};

static
struct ext_slave_descr *kxtf9_get_slave_descr(void)
{
	return &kxtf9_descr;
}

/* -------------------------------------------------------------------------- */
struct kxtf9_mod_private_data {
	struct i2c_client *client;
	struct ext_slave_platform_data *pdata;
};

static unsigned short normal_i2c[] = { I2C_CLIENT_END };

static int kxtf9_mod_probe(struct i2c_client *client,
			   const struct i2c_device_id *devid)
{
	struct ext_slave_platform_data *pdata;
	struct kxtf9_mod_private_data *private_data;
	int result = 0;

	dev_info(&client->adapter->dev, "%s: %s\n", __func__, devid->name);

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		result = -ENODEV;
		goto out_no_free;
	}

	pdata = client->dev.platform_data;
	if (!pdata) {
		dev_err(&client->adapter->dev,
			"Missing platform data for slave %s\n", devid->name);
		result = -EFAULT;
		goto out_no_free;
	}

	private_data = kzalloc(sizeof(*private_data), GFP_KERNEL);
	if (!private_data) {
		result = -ENOMEM;
		goto out_no_free;
	}

	i2c_set_clientdata(client, private_data);
	private_data->client = client;
	private_data->pdata = pdata;

	result = inv_mpu_register_slave(THIS_MODULE, client, pdata,
					kxtf9_get_slave_descr);
	if (result) {
		dev_err(&client->adapter->dev,
			"Slave registration failed: %s, %d\n",
			devid->name, result);
		goto out_free_memory;
	}

	return result;

out_free_memory:
	kfree(private_data);
out_no_free:
	dev_err(&client->adapter->dev, "%s failed %d\n", __func__, result);
	return result;

}

static int kxtf9_mod_remove(struct i2c_client *client)
{
	struct kxtf9_mod_private_data *private_data =
		i2c_get_clientdata(client);

	dev_dbg(&client->adapter->dev, "%s\n", __func__);

	inv_mpu_unregister_slave(client, private_data->pdata,
				kxtf9_get_slave_descr);

	kfree(private_data);
	return 0;
}

static const struct i2c_device_id kxtf9_mod_id[] = {
	{ "kxtf9", ACCEL_ID_KXTF9 },
	{}
};

MODULE_DEVICE_TABLE(i2c, kxtf9_mod_id);

static struct i2c_driver kxtf9_mod_driver = {
	.class = I2C_CLASS_HWMON,
	.probe = kxtf9_mod_probe,
	.remove = kxtf9_mod_remove,
	.id_table = kxtf9_mod_id,
	.driver = {
		   .owner = THIS_MODULE,
		   .name = "kxtf9_mod",
		   },
	.address_list = normal_i2c,
};

static int __init kxtf9_mod_init(void)
{
	int res = i2c_add_driver(&kxtf9_mod_driver);
	pr_info("%s: Probe name %s\n", __func__, "kxtf9_mod");
	if (res)
		pr_err("%s failed\n", __func__);
	return res;
}

static void __exit kxtf9_mod_exit(void)
{
	pr_info("%s\n", __func__);
	i2c_del_driver(&kxtf9_mod_driver);
}

module_init(kxtf9_mod_init);
module_exit(kxtf9_mod_exit);

MODULE_AUTHOR("Invensense Corporation");
MODULE_DESCRIPTION("Driver to integrate KXTF9 sensor with the MPU");
MODULE_LICENSE("GPL");
MODULE_ALIAS("kxtf9_mod");

/**
 *  @}
 */