i2c.h

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/*
 *   openMMC -- Open Source modular IPM Controller firmware
 *
 *   Copyright (C) 2015-2016  Henrique Silva <henrique.silva@lnls.br>
 *
 *   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 3 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/>.
 *
 *   @license GPL-3.0+ <http://spdx.org/licenses/GPL-3.0+>
 */
 
#ifndef I2C_H_
#define I2C_H_
 
#include "FreeRTOS.h"
#include "semphr.h"
#include <stdint.h>
#include <stdbool.h>
 
typedef struct i2c_chip_mapping {
    uint8_t bus_id;                 
    uint8_t i2c_address;            
} i2c_chip_mapping_t;
 
typedef struct i2c_bus_mapping {
    uint8_t i2c_interface;          
    int8_t mux_bus;                 
    uint8_t enabled;                
} i2c_bus_mapping_t;
 
typedef struct i2c_mux_state {
    uint8_t i2c_interface;         
    int8_t state;                   
    SemaphoreHandle_t semaphore;    
} i2c_mux_state_t;
 
void i2c_init( void );
 
bool i2c_set_mux_bus( uint8_t bus_id, i2c_mux_state_t *i2c_mux, int8_t new_state );
 
uint8_t i2c_get_mux_bus( uint8_t bus_id, i2c_mux_state_t *i2c_mux );
 
bool i2c_take_by_busid( uint8_t bus_id, uint8_t *i2c_interface, uint32_t timeout );
 
bool i2c_take_by_chipid( uint8_t chip_id, uint8_t *i2c_address, uint8_t * i2c_interface,  TickType_t timeout );
 
void i2c_give( uint8_t i2c_interface );
 
#endif