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tegrakernel/kernel/nvidia/include/linux/mpu.h

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/*
* Copyright (C) 2012 Invensense, Inc.
* Copyright (c) 2013-2014 NVIDIA CORPORATION. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/**
* @addtogroup DRIVERS
* @brief Hardware drivers.
*
* @{
* @file mpu.h
* @brief mpu definition
*/
#ifndef __MPU_H_
#define __MPU_H_
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/ioctl.h>
#elif defined LINUX
#include <sys/ioctl.h>
#include <linux/types.h>
#else
#include "mltypes.h"
#endif
/*********************************************************************/
/* DEBUG INTERFACE
* Adds SYSFS attributes to read/write MPU registers from ADB
* shell:
* dbg_reg = REGISTER
* A write to dbg_reg sets the device register to use.
* A read reads the current value of dbg_reg.
* dbg_dat = DATA
* A write to dbg_dat initiates an I2C write transaction
* to the device register defined by dbg_reg with the
* data defined by dbg_dat
* A read to dbg_dat initiates an I2C read transaction
* to the device register defined by dbg_reg.
* dbg_i2c_addr = I2C device address
* If set to 0 (default) the MPU I2C address is used.
* Other devices can be accessed by setting this to
* that device's I2C address. When used after enabling
* bypass mode, devices behind the MPU can be accessed.
**********************************************************************/
#define DEBUG_SYSFS_INTERFACE 1
/* Mount maxtices for mount orientation.
* MTMAT_XXX_CCW_YYY
* XXX : mount position. TOP for top and BOT for bottom.
* YYY : couter-clockwise rotation angle in degree.
*/
#define MTMAT_TOP_CCW_0 { 1, 0, 0, 0, 1, 0, 0, 0, 1 }
#define MTMAT_TOP_CCW_90 { 0, -1, 0, 1, 0, 0, 0, 0, 1 }
#define MTMAT_TOP_CCW_180 { -1, 0, 0, 0, -1, 0, 0, 0, 1 }
#define MTMAT_TOP_CCW_270 { 0, 1, 0, -1, 0, 0, 0, 0, 1 }
#define MTMAT_BOT_CCW_0 { -1, 0, 0, 0, 1, 0, 0, 0, -1 }
#define MTMAT_BOT_CCW_90 { 0, -1, 0, -1, 0, 0, 0, 0, -1 }
#define MTMAT_BOT_CCW_180 { 1, 0, 0, 0, -1, 0, 0, 0, -1 }
#define MTMAT_BOT_CCW_270 { 0, 1, 0, 1, 0, 0, 0, 0, -1 }
/*********************************************************************/
/* Structure and function prototypes */
/*********************************************************************/
struct mpu_read_write {
/* Memory address or register address depending on ioctl */
__u16 address;
__u16 length;
__u8 *data;
};
enum mpuirq_data_type {
MPUIRQ_DATA_TYPE_MPU_DATA_READY_IRQ,
MPUIRQ_DATA_TYPE_MPU_FIFO_READY_IRQ,
MPUIRQ_DATA_TYPE_SLAVE_IRQ,
MPUIRQ_DATA_TYPE_PM_EVENT,
MPUIRQ_DATA_TYPE_NUM_TYPES,
};
/* User space PM event notification */
#define MPU_PM_EVENT_SUSPEND_PREPARE (3)
#define MPU_PM_EVENT_POST_SUSPEND (4)
/**
* struct mpuirq_data - structure to report what and when
* @interruptcount : The number of times this IRQ has occured since open
* @irqtime : monotonic time of the IRQ in ns
* @data_type : The type of this IRQ enum mpuirq_data_type
* @data : Data associated with this IRQ
*/
struct mpuirq_data {
__u32 interruptcount;
__s64 irqtime_ns;
__u32 data_type;
__s32 data;
};
enum ext_slave_config_key {
/* TODO: Remove these first six. */
MPU_SLAVE_CONFIG_ODR_SUSPEND,
MPU_SLAVE_CONFIG_ODR_RESUME,
MPU_SLAVE_CONFIG_FSR_SUSPEND,
MPU_SLAVE_CONFIG_FSR_RESUME,
MPU_SLAVE_CONFIG_IRQ_SUSPEND,
MPU_SLAVE_CONFIG_IRQ_RESUME,
MPU_SLAVE_CONFIG_ODR,
MPU_SLAVE_CONFIG_FSR,
MPU_SLAVE_CONFIG_MOT_THS,
MPU_SLAVE_CONFIG_NMOT_THS,
MPU_SLAVE_CONFIG_MOT_DUR,
MPU_SLAVE_CONFIG_NMOT_DUR,
MPU_SLAVE_CONFIG_IRQ,
MPU_SLAVE_WRITE_REGISTERS,
MPU_SLAVE_READ_REGISTERS,
MPU_SLAVE_CONFIG_INTERNAL_REFERENCE,
/* AMI 306 specific config keys */
MPU_SLAVE_PARAM,
MPU_SLAVE_WINDOW,
MPU_SLAVE_READWINPARAMS,
MPU_SLAVE_SEARCHOFFSET,
/* MPU3050 and MPU6050 Keys */
MPU_SLAVE_INT_CONFIG,
MPU_SLAVE_EXT_SYNC,
MPU_SLAVE_FULL_SCALE,
MPU_SLAVE_LPF,
MPU_SLAVE_CLK_SRC,
MPU_SLAVE_DIVIDER,
MPU_SLAVE_DMP_ENABLE,
MPU_SLAVE_FIFO_ENABLE,
MPU_SLAVE_DMP_CFG1,
MPU_SLAVE_DMP_CFG2,
MPU_SLAVE_TC,
MPU_SLAVE_GYRO,
MPU_SLAVE_ADDR,
MPU_SLAVE_PRODUCT_REVISION,
MPU_SLAVE_SILICON_REVISION,
MPU_SLAVE_PRODUCT_ID,
MPU_SLAVE_GYRO_SENS_TRIM,
MPU_SLAVE_ACCEL_SENS_TRIM,
MPU_SLAVE_RAM,
/* -------------------------- */
MPU_SLAVE_CONFIG_NUM_CONFIG_KEYS
};
/* For the MPU_SLAVE_CONFIG_IRQ_SUSPEND and MPU_SLAVE_CONFIG_IRQ_RESUME */
enum ext_slave_config_irq_type {
MPU_SLAVE_IRQ_TYPE_NONE,
MPU_SLAVE_IRQ_TYPE_MOTION,
MPU_SLAVE_IRQ_TYPE_DATA_READY,
};
/* Structure for the following IOCTS's
* MPU_CONFIG_GYRO
* MPU_CONFIG_ACCEL
* MPU_CONFIG_COMPASS
* MPU_CONFIG_PRESSURE
* MPU_GET_CONFIG_GYRO
* MPU_GET_CONFIG_ACCEL
* MPU_GET_CONFIG_COMPASS
* MPU_GET_CONFIG_PRESSURE
*
* @key one of enum ext_slave_config_key
* @len length of data pointed to by data
* @apply zero if communication with the chip is not necessary, false otherwise
* This flag can be used to select cached data or to refresh cashed data
* cache data to be pushed later or push immediately. If true and the
* slave is on the secondary bus the MPU will first enger bypass mode
* before calling the slaves .config or .get_config funcion
* @data pointer to the data to confgure or get
*/
struct ext_slave_config {
__u8 key;
__u16 len;
__u8 apply;
void *data;
};
enum ext_slave_type {
EXT_SLAVE_TYPE_GYROSCOPE,
EXT_SLAVE_TYPE_ACCEL,
EXT_SLAVE_TYPE_COMPASS,
EXT_SLAVE_TYPE_PRESSURE,
/*EXT_SLAVE_TYPE_TEMPERATURE */
EXT_SLAVE_NUM_TYPES
};
enum secondary_slave_type {
SECONDARY_SLAVE_TYPE_NONE,
SECONDARY_SLAVE_TYPE_ACCEL,
SECONDARY_SLAVE_TYPE_COMPASS,
SECONDARY_SLAVE_TYPE_PRESSURE,
SECONDARY_SLAVE_TYPE_TYPES
};
enum ext_slave_id {
ID_INVALID = 0,
GYRO_ID_MPU3050,
GYRO_ID_MPU6050A2,
GYRO_ID_MPU6050B1,
GYRO_ID_MPU6050B1_NO_ACCEL,
GYRO_ID_ITG3500,
ACCEL_ID_LIS331,
ACCEL_ID_LSM303DLX,
ACCEL_ID_LIS3DH,
ACCEL_ID_KXSD9,
ACCEL_ID_KXTF9,
ACCEL_ID_BMA150,
ACCEL_ID_BMA222,
ACCEL_ID_BMA250,
ACCEL_ID_ADXL34X,
ACCEL_ID_MMA8450,
ACCEL_ID_MMA845X,
ACCEL_ID_MPU6050,
COMPASS_ID_AK8963,
COMPASS_ID_AK8975,
COMPASS_ID_AK8972,
COMPASS_ID_AMI30X,
COMPASS_ID_AMI306,
COMPASS_ID_YAS529,
COMPASS_ID_YAS530,
COMPASS_ID_HMC5883,
COMPASS_ID_LSM303DLH,
COMPASS_ID_LSM303DLM,
COMPASS_ID_MMC314X,
COMPASS_ID_HSCDTD002B,
COMPASS_ID_HSCDTD004A,
PRESSURE_ID_BMA085,
};
#define INV_PROD_KEY(ver, rev) (ver * 100 + rev)
enum ext_slave_endian {
EXT_SLAVE_BIG_ENDIAN,
EXT_SLAVE_LITTLE_ENDIAN,
EXT_SLAVE_FS8_BIG_ENDIAN,
EXT_SLAVE_FS16_BIG_ENDIAN,
};
enum ext_slave_bus {
EXT_SLAVE_BUS_INVALID = -1,
EXT_SLAVE_BUS_PRIMARY = 0,
EXT_SLAVE_BUS_SECONDARY = 1
};
/**
* struct ext_slave_platform_data - Platform data for mpu3050 and mpu6050
* slave devices
*
* @type: the type of slave device based on the enum ext_slave_type
* definitions.
* @irq: the irq number attached to the slave if any.
* @adapt_num: the I2C adapter number.
* @bus: the bus the slave is attached to: enum ext_slave_bus
* @address: the I2C slave address of the slave device.
* @orientation: the mounting matrix of the device relative to MPU.
* @irq_data: private data for the slave irq handler
* @private_data: additional data, user customizable. Not touched by the MPU
* driver.
*
* The orientation matricies are 3x3 rotation matricies
* that are applied to the data to rotate from the mounting orientation to the
* platform orientation. The values must be one of 0, 1, or -1 and each row and
* column should have exactly 1 non-zero value.
*/
struct ext_slave_platform_data {
__u8 type;
__u32 irq;
__u32 adapt_num;
__u32 bus;
__u8 address;
__s8 orientation[9];
void *irq_data;
void *private_data;
};
struct fix_pnt_range {
__s32 mantissa;
__s32 fraction;
};
static inline long range_fixedpoint_to_long_mg(struct fix_pnt_range rng)
{
return (long)(rng.mantissa * 1000 + rng.fraction / 10);
}
struct ext_slave_read_trigger {
__u8 reg;
__u8 value;
};
/**
* struct ext_slave_descr - Description of the slave device for programming.
*
* @suspend: function pointer to put the device in suspended state
* @resume: function pointer to put the device in running state
* @read: function that reads the device data
* @init: function used to preallocate memory used by the driver
* @exit: function used to free memory allocated for the driver
* @config: function used to configure the device
* @get_config:function used to get the device's configuration
*
* @name: text name of the device
* @type: device type. enum ext_slave_type
* @id: enum ext_slave_id
* @read_reg: starting register address to retrieve data.
* @read_len: length in bytes of the sensor data. Typically 6.
* @endian: byte order of the data. enum ext_slave_endian
* @range: full scale range of the slave ouput: struct fix_pnt_range
* @trigger: If reading data first requires writing a register this is the
* data to write.
*
* Defines the functions and information about the slave the mpu3050 and
* mpu6050 needs to use the slave device.
*/
struct ext_slave_descr {
int (*init) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata);
int (*exit) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata);
int (*suspend) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata);
int (*resume) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata);
int (*read) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
__u8 *data);
int (*config) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
struct ext_slave_config *config);
int (*get_config) (void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
struct ext_slave_config *config);
char *name;
__u8 type;
__u8 id;
__u8 read_reg;
__u8 read_len;
__u8 endian;
struct fix_pnt_range range;
struct ext_slave_read_trigger *trigger;
};
#define NVI_CONFIG_BOOT_AUTO (0) /* auto detect connection to MPU */
#define NVI_CONFIG_BOOT_MPU (1) /* connected to MPU */
#define NVI_CONFIG_BOOT_HOST (2) /* connected to host */
#define NVI_CONFIG_BOOT_MASK (0x03)
/**
* struct mpu_platform_data - Platform data for the mpu driver
* @int_config: Bits [7:3] of the int config register.
* @level_shifter: 0: VLogic, 1: VDD
* @orientation: Orientation matrix of the gyroscope
* @sec_slave_type: secondary slave device type, can be compass, accel, etc
* @sec_slave_id: id of the secondary slave device
* @secondary_i2c_address: secondary device's i2c address
* @secondary_orientation: secondary device's orientation matrix
* @config: the selection determines the device behavior.
* Select from the NVI_CONFIG_BOOT_ defines.
*
* Contains platform specific information on how to configure the MPU3050 to
* work on this platform. The orientation matricies are 3x3 rotation matricies
* that are applied to the data to rotate from the mounting orientation to the
* platform orientation. The values must be one of 0, 1, or -1 and each row and
* column should have exactly 1 non-zero value.
*/
struct mpu_platform_data {
__u8 int_config;
__u8 level_shifter;
__s8 orientation[9];
enum secondary_slave_type sec_slave_type;
enum ext_slave_id sec_slave_id;
__u16 secondary_i2c_addr;
__u8 secondary_read_reg;
__s8 secondary_orientation[9];
__u8 key[16];
__u8 config;
};
/**
* struct nvi_mpu_port: Allows an external driver to use the MPU
* auxiliary I2C master by providing the details for the I2C
* polling of a device connected to the MPU.
* - addr: The 6:0 I2C address of the device connected to
* the MPU.
* 7:7 = 0 if the port is to do write transactions.
* = 1 if the port is to do read transactions.
* - reg: The device register the I2C transaction will
* use.
* - ctrl: The number of consecutive registers to read in
* 3:0. If the port is to do write transactions then this
* value must be 1. See MPU documentation for the other
* bits in I2C_SLVx_CTRL that can be applied by this byte.
* - data_out: The data byte written if the port is configured
* to do writes (addr 7:7 = 0).
* - delay_ms: The polling delay time between I2C transactions
* in ms. Note that the MPU HW only supports one delay
* time so the longest delay of all the MPU ports enabled
* is used.
* - delay_us: The delay at which the read data is reported.
* - shutdown_bypass: set if a connection to the host is needed
* when the system is shutdown. The MPU API will be
* disabled as part of its shutdown but it will enable the
* bypass if this is true.
* - *handler: The pointer to the function called when the data
* is available. This can be NULL if the port is
* configured for write transactions.
* The function is called with the following parameters:
* - *data: The pointer to the data to read.
* - length: The number of bytes to be read (same value as
* length above).
* - timestamp: The timestamp of when the data was polled.
* - *pointer: A generic pointer defined next below. Note
* that this can be NULL if this will be a write I2C
* transaction.
* - *ext_driver: A generic pointer that can be used by the
* external driver. Note that this is specifically for the
* external driver and not used by the MPU.
*/
struct nvi_mpu_port {
u8 addr;
u8 reg;
u8 ctrl;
u8 data_out;
unsigned int delay_ms;
unsigned long delay_us;
bool shutdown_bypass;
void (*handler)(u8 *data, unsigned int len,
long long timestamp, void *ext_driver);
void *ext_driver;
};
/**
* Expected use of the nvi_mpu_ routines are as follows:
* - nvi_input_mpu_dev_valid: Use to validate whether a device
* is connected to the MPU.
* - nvi_input_mpu_port_alloc: Request a connection to the
* device. If successful, a port number will be returned to
* identify the connection. The port number is then used
* for all further communication with the connection.
* - nvi_input_mpu_port_free: Use to close the port connection.
* - nvi_input_mpu_enable: Use to enable/disable a port.
* The enable and FIFO enable is disabled by default so
* this will be required after a port is assigned.
* - nvi_input_mpu_delay_us: Use to set the sampling rate in
* microseconds. The fastest rate of all the enabled MPU
* devices will be used that does not exceed the
* nvi_input_mpu_delay_ms setting of an enabled device.
* - nvi_input_mpu_delay_ms: Use to change the port polling
* delay at runtime. There is only one HW delay so the
* delay used will be the longest delay of all the enabled
* ports. This is separate from the sampling rate
* (nvi_input_mpu_delay_us). See function notes below.
* - nvi_input_mpu_data_out: Use to change the data written at
* runtime for ports that are configured as I2C write
* transactions.
* - nvi_input_mpu_bypass request/release: Use to
* connect/disconnect the MPU host from the device. When
* bypass is enabled, the connection from the device to the
* MPU will then be connected to the host (that the MPU is
* connected to). This is a global connection switch
* affecting all ports so a mechanism is in place of
* whether the request is honored or not. See the function
* notes for nvi_input_mpu_bypass_request.
*/
/**
* Use to validate a device connected to the MPU I2C master.
* The function works by doing a single byte read or write to
* the device and detecting a NACK. Typically, the call would
* be set up to read a byte ID of the device.
* @param struct nvi_mpu_port *nmp
* Only the following is needed in nmp:
* - addr
* - reg
* - ctrl
* - data_out if a write transaction
* @param *val: pointer for read data. Can be NULL if write.
* @return int error
* Possible return value or errors are:
* - 0: device is connected to MPU.
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -ENODEV: The device is not connected to the MPU.
* - -EINVAL: Problem with input parameters.
* - -EIO: The device is connected but responded with
* a NACK.
*/
int nvi_input_mpu_dev_valid(struct nvi_mpu_port *nmp, u8 *data);
/**
* Request a port.
* @param struct nvi_mpu_port *nmp
* - addr: device I2C address 6:0.
* 7:7 = 0 if the port is to do writes.
* 7:7 = 1 if the port is to do reads.
* - reg: the starting register to write or read.
* - ctrl: number of bytes to read. Use 1 if port
* is configured to do writes.
* - data_out: only valid if port is configured to do
* writes.
* - delay: polling delay
* - handler: function to call when data is read. This
* should be NULL if the port is configured to do
* writes.
* - ext_driver: this pointer is passed in handler for
* use by external driver. This should be NULL
* if the port is configured for writes.
* @return int error/port id
* if return >= 0 then this is the port ID. The ID
* will have a value of 0 to 3 (HW has 4 ports).
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -ENODEV: A port is not available. The only way
* to resolve this error is for a port to be
* freed.
* - -EINVAL: Problem with input parameters.
*/
int nvi_input_mpu_port_alloc(struct nvi_mpu_port *nmp);
/**
* Remove a port.
* @param port
* @return int error
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -EINVAL: Problem with input parameters.
*/
int nvi_input_mpu_port_free(int port);
/**
* Enable/disable a port.
* @param port
* @param enable
* @return int error
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -EINVAL: Problem with input parameters.
*/
int nvi_input_mpu_enable(int port, bool enable, bool fifo_enable);
/**
* Use to change the ports sampling delay in microseconds. The
* hardware only supports one sampling rate so the shortest time
* is used among all enabled ports, accelerometer, and gyro. If
* the requested rate is longer than the actual rate and the
* port is configured for reads, the data will be reported at
* the requested rate skipping the data polled at the faster
* rate. Setting this to zero causes other enabled devices to
* determine the sampling rate. If there are no other enabled
* devices, then the MPU default rate is used.
* @param port
* @param delay_us
* @return int error
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -EINVAL: Problem with input parameters.
*/
int nvi_input_mpu_delay_us(int port, unsigned long delay_us);
/**
* Use to change the ports polling delay in milliseconds.
* A delay value of 0 disables the delay for that port. The
* hardware only supports one delay value so the largest request
* of all the enabled ports is used. The polling delay is in
* addition to the sampling delay (nvi_input_mpu_delay_us).
* This is typically used to guarantee a delay after an I2C
* write to a device to allow the device to process the request
* and be read by another port before another write at the
* sampling delay.
*
* @param port
* @param delay_ms
* @return int error/delay used or 0 if request is to disable
* and is successful.
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -EINVAL: Problem with input parameters.
*/
int nvi_input_mpu_delay_ms(int port, u8 delay_ms);
/**
* Use to change the data written to the sensor.
* @param port
* @param data_out is the new data to be written
* @return int error
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
* - -EINVAL: Problem with input parameters.
*/
int nvi_input_mpu_data_out(int port, u8 data_out);
/**
* Enable/disable the MPU bypass mode. When enabled, the MPU
* will connect its auxiliary I2C ports to the host. This is
* typically used to initialize a device that requires more I2C
* transactions than the automated port polling can offer.
* EVERY nvi_input_mpu_bypass_request call must be balanced with
* a nvi_input_mpu_bypass_release call! A bypass request does
* not need a following ~enable call. The release call will
* automatically handle the correct bypass enable setting. The
* request locks the bypass setting if successful. The release
* unlocks and restores the setting if need be. Although odd,
* the purpose of the request call with the enable cleared to
* false is to allow an external driver to access its device
* that would normally conflict with a device behind the MPU.
* Note that this call must not be a permanent solution, i.e.
* delayed or no release call. When the MPU is in a shutdown
* state the return error will be
* -EPERM and bypass will be enabled to allow access from the
* host to the devices connected to the MPU for their own
* shutdown needs.
* @param enable
* @return int error: calls that return with an error must not
* be balanced with a release call.
* Possible errors are:
* - -EAGAIN: MPU is not initialized yet.
* - -EPERM: MPU is shutdown. MPU API won't be
* available until a system restart.
* - -EBUSY: MPU is busy with another request.
*/
int nvi_input_mpu_bypass_request(bool enable);
/**
* See the nvi_input_mpu_bypass_request notes.
* @return int 0: Always returns 0. The call return should be
* void but for backward compatibility it returns 0.
*/
int nvi_input_mpu_bypass_release(void);
/**
* Register the sysfs node from secondary i2c to mpu so that
* it can be managed together
*/
int nvi_input_mpu_sysfs_register(struct kobject *target, char *name);
#endif /* __MPU_H_ */
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