/*********************************************************************************
 *      Copyright:  (C) 2019 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  relay.c
 *    Description:  This file 
 *                 
 *        Version:  1.0.0(30/01/19)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "30/01/19 08:44:30"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <libgen.h>
#include <string.h>

#include <gpiod.h>

#define ON              1
#define OFF             0

/* Relay    #Pin(29)    GPIO05(BCM 5)  */
#define relay_pin       5

int turn_relay(int cmd);

int main (int argc, char **argv)
{
    if( argc != 2 )
    {
        printf("Usage: %s [on/off]\n", basename(argv[0]));
        return -1;
    }

    if( !strstr(argv[1], "on") || !strstr(argv[1], "on") )
    {
        turn_relay(ON);
    }
    else if( !strstr(argv[1], "off") || !strstr(argv[1], "off") )
    {
        turn_relay(OFF);
    }

    return 0;
}

static void gpiod_ctxless_cb(void *data)
{
        sleep(3);
}

int turn_relay(int cmd)
{
        if( OFF == cmd )
                gpiod_ctxless_set_value("gpiochip0", relay_pin, 0, false, "relay", gpiod_ctxless_cb, NULL);
        else
                gpiod_ctxless_set_value("gpiochip0", relay_pin, 1, false, "relay", gpiod_ctxless_cb, NULL);
}