/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies Inc.
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************/

/**
 * @file i2c.c
 * @author Nations
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */

#ifndef __I2C_H__
#define __I2C_H__

#include <rtthread.h>

#ifdef __cplusplus
extern "C" {
#endif

#define RT_I2C_WR                0x0000
#define RT_I2C_RD               (1u << 0)
#define RT_I2C_ADDR_10BIT       (1u << 2)  /* this is a ten bit chip address */
#define RT_I2C_NO_START         (1u << 4)
#define RT_I2C_IGNORE_NACK      (1u << 5)
#define RT_I2C_NO_READ_ACK      (1u << 6)  /* when I2C reading, we do not ACK */

struct rt_i2c_msg
{
    rt_uint16_t addr;
    rt_uint16_t flags;
    rt_uint16_t len;
    rt_uint8_t  *buf;
};

struct rt_i2c_bus_device;

struct rt_i2c_bus_device_ops
{
    rt_size_t (*master_xfer)(struct rt_i2c_bus_device *bus,
                             struct rt_i2c_msg msgs[],
                             rt_uint32_t num);
    rt_size_t (*slave_xfer)(struct rt_i2c_bus_device *bus,
                            struct rt_i2c_msg msgs[],
                            rt_uint32_t num);
    rt_err_t (*i2c_bus_control)(struct rt_i2c_bus_device *bus,
                                rt_uint32_t,
                                rt_uint32_t);
};

/*for i2c bus driver*/
struct rt_i2c_bus_device
{
    struct rt_device parent;
    const struct rt_i2c_bus_device_ops *ops;
    rt_uint16_t  flags;
    rt_uint16_t  addr;
    struct rt_mutex lock;
    rt_uint32_t  timeout;
    rt_uint32_t  retries;
    void *priv;
};

struct rt_i2c_client
{
    struct rt_device               parent;
    struct rt_i2c_bus_device       *bus;
    rt_uint16_t                    client_addr;
};

rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
                                    const char               *bus_name);
struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name);
rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
                          struct rt_i2c_msg         msgs[],
                          rt_uint32_t               num);
rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
                             rt_uint16_t               addr,
                             rt_uint16_t               flags,
                             const rt_uint8_t         *buf,
                             rt_uint32_t               count);
rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
                             rt_uint16_t               addr,
                             rt_uint16_t               flags,
                             rt_uint8_t               *buf,
                             rt_uint32_t               count);
int rt_i2c_core_init(void);

#ifdef __cplusplus
}
#endif

#endif