linux/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2019 TDK-InvenSense, Inc.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/delay.h>

#include "inv_mpu_aux.h"
#include "inv_mpu_iio.h"

/*
 * i2c master auxiliary bus transfer function.
 * Requires the i2c operations to be correctly setup before.
 */
static int inv_mpu_i2c_master_xfer(const struct inv_mpu6050_state *st)
{ … }

/**
 * inv_mpu_aux_init() - init i2c auxiliary bus
 * @st: driver internal state
 *
 * Returns 0 on success, a negative error code otherwise.
 */
int inv_mpu_aux_init(const struct inv_mpu6050_state *st)
{ … }

/**
 * inv_mpu_aux_read() - read register function for i2c auxiliary bus
 * @st: driver internal state.
 * @addr: chip i2c Address
 * @reg: chip register address
 * @val: buffer for storing read bytes
 * @size: number of bytes to read
 *
 *  Returns 0 on success, a negative error code otherwise.
 */
int inv_mpu_aux_read(const struct inv_mpu6050_state *st, uint8_t addr,
		     uint8_t reg, uint8_t *val, size_t size)
{ … }

/**
 * inv_mpu_aux_write() - write register function for i2c auxiliary bus
 * @st: driver internal state.
 * @addr: chip i2c Address
 * @reg: chip register address
 * @val: 1 byte value to write
 *
 *  Returns 0 on success, a negative error code otherwise.
 */
int inv_mpu_aux_write(const struct inv_mpu6050_state *st, uint8_t addr,
		      uint8_t reg, uint8_t val)
{ … }