/*
* itg3200.h -- support InvenSense ITG3200
* Digital 3-Axis Gyroscope driver
*
* Copyright (c) 2011 Christian Strobel <[email protected]>
* Copyright (c) 2011 Manuel Stahl <[email protected]>
* Copyright (c) 2012 Thorsten Nowak <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/

#ifndef I2C_ITG3200_H_
#define I2C_ITG3200_H_

#include <linux/iio/iio.h>

/* Register with I2C address (34h) */
#define ITG3200_REG_ADDRESS 0x00

/* Sample rate divider
* Range: 0 to 255
* Default value: 0x00 */
#define ITG3200_REG_SAMPLE_RATE_DIV 0x15

/* Digital low pass filter settings */
#define ITG3200_REG_DLPF 0x16
/* DLPF full scale range */
#define ITG3200_DLPF_FS_SEL_2000 0x18
/* Bandwidth (Hz) and internal sample rate
* (kHz) of DLPF */
#define ITG3200_DLPF_256_8 0x00
#define ITG3200_DLPF_188_1 0x01
#define ITG3200_DLPF_98_1 0x02
#define ITG3200_DLPF_42_1 0x03
#define ITG3200_DLPF_20_1 0x04
#define ITG3200_DLPF_10_1 0x05
#define ITG3200_DLPF_5_1 0x06

#define ITG3200_DLPF_CFG_MASK 0x07

/* Configuration for interrupt operations */
#define ITG3200_REG_IRQ_CONFIG 0x17
/* Logic level */
#define ITG3200_IRQ_ACTIVE_LOW 0x80
#define ITG3200_IRQ_ACTIVE_HIGH 0x00
/* Drive type */
#define ITG3200_IRQ_OPEN_DRAIN 0x40
#define ITG3200_IRQ_PUSH_PULL 0x00
/* Latch mode */
#define ITG3200_IRQ_LATCH_UNTIL_CLEARED 0x20
#define ITG3200_IRQ_LATCH_50US_PULSE 0x00
/* Latch clear method */
#define ITG3200_IRQ_LATCH_CLEAR_ANY 0x10
#define ITG3200_IRQ_LATCH_CLEAR_STATUS 0x00
/* Enable interrupt when device is ready */
#define ITG3200_IRQ_DEVICE_RDY_ENABLE 0x04
/* Enable interrupt when data is available */
#define ITG3200_IRQ_DATA_RDY_ENABLE 0x01

/* Determine the status of ITG-3200 interrupts */
#define ITG3200_REG_IRQ_STATUS 0x1A
/* Status of 'device is ready'-interrupt */
#define ITG3200_IRQ_DEVICE_RDY_STATUS 0x04
/* Status of 'data is available'-interrupt */
#define ITG3200_IRQ_DATA_RDY_STATUS 0x01

/* Sensor registers */
#define ITG3200_REG_TEMP_OUT_H 0x1B
#define ITG3200_REG_TEMP_OUT_L 0x1C
#define ITG3200_REG_GYRO_XOUT_H 0x1D
#define ITG3200_REG_GYRO_XOUT_L 0x1E
#define ITG3200_REG_GYRO_YOUT_H 0x1F
#define ITG3200_REG_GYRO_YOUT_L 0x20
#define ITG3200_REG_GYRO_ZOUT_H 0x21
#define ITG3200_REG_GYRO_ZOUT_L 0x22

/* Power management */
#define ITG3200_REG_POWER_MANAGEMENT 0x3E
/* Reset device and internal registers to the
* power-up-default settings */
#define ITG3200_RESET 0x80
/* Enable low power sleep mode */
#define ITG3200_SLEEP 0x40
/* Put according gyroscope in standby mode */
#define ITG3200_STANDBY_GYRO_X 0x20
#define ITG3200_STANDBY_GYRO_Y 0x10
#define ITG3200_STANDBY_GYRO_Z 0x08
/* Determine the device clock source */
#define ITG3200_CLK_INTERNAL 0x00
#define ITG3200_CLK_GYRO_X 0x01
#define ITG3200_CLK_GYRO_Y 0x02
#define ITG3200_CLK_GYRO_Z 0x03
#define ITG3200_CLK_EXT_32K 0x04
#define ITG3200_CLK_EXT_19M 0x05


/**
* struct itg3200 - device instance specific data
* @i2c: actual i2c_client
* @trig: data ready trigger from itg3200 pin
**/
struct itg3200 {
struct i2c_client *i2c;
struct iio_trigger *trig;
};

enum ITG3200_SCAN_INDEX {
ITG3200_SCAN_TEMP,
ITG3200_SCAN_GYRO_X,
ITG3200_SCAN_GYRO_Y,
ITG3200_SCAN_GYRO_Z,
ITG3200_SCAN_ELEMENTS,
};

int itg3200_write_reg_8(struct iio_dev *indio_dev,
u8 reg_address, u8 val);

int itg3200_read_reg_8(struct iio_dev *indio_dev,
u8 reg_address, u8 *val);


#ifdef CONFIG_IIO_BUFFER

void itg3200_remove_trigger(struct iio_dev *indio_dev);
int itg3200_probe_trigger(struct iio_dev *indio_dev);

int itg3200_buffer_configure(struct iio_dev *indio_dev);
void itg3200_buffer_unconfigure(struct iio_dev *indio_dev);

#else /* CONFIG_IIO_BUFFER */

static inline void itg3200_remove_trigger(struct iio_dev *indio_dev)
{
}

static inline int itg3200_probe_trigger(struct iio_dev *indio_dev)
{
return 0;
}

static inline int itg3200_buffer_configure(struct iio_dev *indio_dev)
{
return 0;
}

static inline void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
{
}

#endif /* CONFIG_IIO_BUFFER */

#endif /* ITG3200_H_ */