/*********************************************************************************
 *      Copyright:  (C) 2019 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  infrared.c
 *    Description:  This file 
 *                 
 *     pi@raspberrypi:~ $ gpio readall     #show BCM and wPi pinmap  
 *
 *             PIN          #PIN        BCM           wPi 
 *           VCC(left) ----  2   ----   5v     ----   5v
 *         I/O(indoor) ----  16  ----   23     ----   4
 *        I/O(hallway) ----  18  ----   24     ----   5
 *          GND(right) ----  34  ----   0v     ----   0v
 *
 *        Version:  1.0.0(30/01/19)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "30/01/19 03:37:16"
 *                 
 ********************************************************************************/

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

//#define CONFIG_USE_WIRINGPI

#ifdef CONFIG_USE_WIRINGPI

#include <wiringPi.h>

#define INFRARED_PIN           4
//#define INFRARED_PIN           5

int main (int argc, char **argv)
{
    wiringPiSetup();
    pinMode(INFRARED_PIN, INPUT);

    while(1)
    {
        printf("Infrared monitor: %s\n", digitalRead(INFRARED_PIN)? "Someone is closing!":"No one nearby!");
        sleep(1);
    }

    return 0;
}

#else

#include <gpiod.h>

#define INFRARED_PIN           23
//#define INFRARED_PIN           24

int main (int argc, char **argv)
{
    struct gpiod_chip*       chip;
    struct gpiod_line*       line;
    int                      rv = 0;
    struct gpiod_line_event  event;

    chip = gpiod_chip_open_by_name("gpiochip0");
    if( !chip )
    {
        printf("gpiod open chip failure, maybe you need running as root\n");
        return 1;
    }

    line = gpiod_chip_get_line(chip, INFRARED_PIN);
    if( !line )
    {
        printf("gpiod get line[%d] failure\n", INFRARED_PIN);
        rv = 2;
        goto cleanup;
    }


    //if( gpiod_line_request_rising_edge_events(line, "infrared") < 0 )
    if( gpiod_line_request_falling_edge_events(line, "infrared") < 0 )
    {
        printf("gpiod request rising edge event failure: %s\n", strerror(errno));
        rv = 3;
        goto cleanup;
    }

    while(1)
    {
        /* This function will block, must call it to setup */
        printf("Start gpiod_line_event_wait...\n");
        if( gpiod_line_event_wait(line, NULL) < 0 )
        {
            printf("gpiod line wait event failure!\n");
        }

        /* This function will block, must read to clear the event  */
        printf("Start gpiod_line_event_read...\n");
        if (gpiod_line_event_read(line, &event) < 0)
        {
            printf("gpiod line wait event failure!\n");
        }

        if (event.event_type == GPIOD_LINE_EVENT_RISING_EDGE)
        {
            printf("Infrared monitor: Someone is closing!\n");
        }
    }

cleanup:
    gpiod_chip_close(chip);
    return rv;
}


#endif