/*********************************************************************************
 *      Copyright:  (C) 2024 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  relay.h
 *    Description:  This file is used to control relay
 *
 ********************************************************************************/

#ifndef  _RELAY_H_
#define  _RELAY_H_

#include "gpiod.h"

#define DELAY     300

#define ON        1
#define OFF       0

/* relay number */
enum
{
    RELAY1 = 0,
    RELAY_CNT,
};

enum
{
    ACTIVE_HIGH, /* High level will turn relay on */
    ACTIVE_LOW,  /* Low level will turn relay on */
};

/* relay hardware information */
typedef struct relay_s
{
    const char               *name;      /* relay name  */
    int                       chip_num;  /* relay connect chip */
    int                       gpio_num;  /* relay connect line */
    int                       active;    /* relay active level */
    int                       status;    /* relay current status */
    struct gpiod_line_request *request;  /* libgpiod gpio request handler */
} relay_t;

/* relay structure */
typedef struct relays_s
{
    relay_t             *relays;/* relay pointer to relays_info */
    int                  count; /* relay count */
} relays_t;

/* initial relays */
int init_relay(void);

/* terminate relays   */
int term_relay(void);

/* turn $which relay ON/OFF */
int turn_relay(int which, int cmd);

/* toggle $which relay status */
int toggle_relay(int which);

#endif