ctnd/appl/power/power.c

#include "plt.h"

#define DEV_PATH "/sys/class/gpio/gpio129/value"        // 输入输出电平值设备
#define EXPORT_PATH "/sys/class/gpio/export"            // GPIO设备导出设备
#define DIRECT_PATH "/sys/class/gpio/gpio129/direction" // GPIO输入输出控制设备
#define IN "in"
#define GPIO "129" // GPIO5_1

int fd_dev, fd_export, fd_dir, ret;

int device_power_on = 1;
int power_detection_init()
{
    char buf[10];
    fd_export = open(EXPORT_PATH, O_WRONLY); // 打开GPIO设备导出设备
    if (fd_export < 0)
    {
        perror("open export:");
        return -1;
    }
    write(fd_export, GPIO, strlen(GPIO));
    fd_dev = open(DEV_PATH, O_RDWR); // 打开输入输出电平值设备
    if (fd_dev < 0)
    {
        perror("open gpio:");
        return -1;
    }
    fd_dir = open(DIRECT_PATH, O_RDWR); // 打开GPIO输入输出控制设备
    if (fd_dir < 0)
    {
        perror("open direction:");
        return -1;
    }
    strcpy(buf, IN);
    ret = write(fd_dir, buf, strlen(IN));
    if (ret < 0)
    {
        perror("write direction:");
        close(fd_export);
        close(fd_dir);
        close(fd_dev);
        return -1;
    }
    return 0;
}

int power_detection_exe()
{
    static char last[10] = {0};
    static char buf[10] = {0};
    memset(buf, 0, sizeof(buf));
    lseek(fd_dev, 0, SEEK_SET);
    ret = read(fd_dev, buf, sizeof(buf)); // 读取GPIO5_1输入电平值
    if (ret < 0)
    {
        log_dbg("ERROR : failed to read power on/off detection");
        // close(fd_export);
        // close(fd_dir);
        // close(fd_dev);
        // return -1;
    }
    else
    {
        if (buf[0] == '1')
        {
            if (strcmp(buf, last) != 0)
            {
                strcpy(last, buf);
                tb_send_telemetry("power:1");
                log_dbg("Power on");
            }
            device_power_on = 1;
        }
        else
        {
            if (strcmp(buf, last) != 0)
            {
                strcpy(last, buf);
                tb_send_telemetry("power:0");
                log_dbg("Power off");
            }
            device_power_on = 0;
        }
    }
}