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/*
* Copyright (c) 2016 - 2021, Broadcom
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef I2C_H
#define I2C_H
#include <stdint.h>
#define I2C_SPEED_100KHz 100000
#define I2C_SPEED_400KHz 400000
#define I2C_SPEED_DEFAULT I2C_SPEED_100KHz
/*
* Function Name: i2c_probe
*
* Description:
* This function probes the I2C bus for the existence of the specified
* device.
*
* Parameters:
* bus_id - I2C bus ID
* devaddr - Device Address
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_probe(uint32_t bus_id, uint8_t devaddr);
/*
* Function Name: i2c_init
*
* Description:
* This function initializes the SMBUS.
*
* Parameters:
* bus_id - I2C bus ID
* speed - I2C bus speed in Hz
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_init(uint32_t bus_id, int speed);
/*
* Function Name: i2c_set_bus_speed
*
* Description:
* This function configures the SMBUS speed
*
* Parameters:
* bus_id - I2C bus ID
* speed - I2C bus speed in Hz
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_set_bus_speed(uint32_t bus_id, uint32_t speed);
/*
* Function Name: i2c_get_bus_speed
*
* Description:
* This function returns the SMBUS speed.
*
* Parameters:
* bus_id - I2C bus ID
*
* Return:
* Bus speed in Hz, 0 on failure
*/
uint32_t i2c_get_bus_speed(uint32_t bus_id);
/*
* Function Name: i2c_recv_byte
*
* Description:
* This function reads I2C data from a device without specifying
* a command register.
*
* Parameters:
* bus_id - I2C bus ID
* devaddr - Device Address
* value - Data Read
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_recv_byte(uint32_t bus_id, uint8_t devaddr, uint8_t *value);
/*
* Function Name: i2c_send_byte
*
* Description:
* This function send I2C data to a device without specifying
* a command register.
*
* Parameters:
* bus_id - I2C bus ID
* devaddr - Device Address
* value - Data Send
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_send_byte(uint32_t bus_id, uint8_t devaddr, uint8_t value);
/*
* Function Name: i2c_read
*
* Description:
* This function reads I2C data from a device with a designated
* command register
*
* Parameters:
* bus_id - I2C bus ID
* devaddr - Device Address
* addr - Register Offset
* alen - Address Length, 1 for byte, 2 for word (not supported)
* buffer - Data Buffer
* len - Data Length in bytes
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_read(uint32_t bus_id,
uint8_t devaddr,
uint32_t addr,
int alen,
uint8_t *buffer,
int len);
/*
* Function Name: i2c_write
*
* Description:
* This function write I2C data to a device with a designated
* command register
*
* Parameters:
* bus_id - I2C bus ID
* devaddr - Device Address
* addr - Register Offset
* alen - Address Length, 1 for byte, 2 for word (not supported)
* buffer - Data Buffer
* len - Data Length in bytes
*
* Return:
* 0 on success, or -1 on failure.
*/
int i2c_write(uint32_t bus_id,
uint8_t devaddr,
uint32_t addr,
int alen,
uint8_t *buffer,
int len);
#endif /* I2C_H */
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