#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char **argv)
{
        char *chipname = "gpiochip4";
        unsigned int line_num = 24;
        int val;
        struct gpiod_chip *chip;
        struct gpiod_line *line;
        int i, ret;

        chip = gpiod_chip_open_by_name(chipname);
        if (!chip) {
                perror("Open chip failed\n");
                goto end;
        }

        line = gpiod_chip_get_line(chip, line_num);
        if (!line) {
                perror("Get line failed\n");
                goto close_chip;
        }

        ret = gpiod_line_request_input(line, "me");
        if (ret < 0) {
                perror("Request line as input failed\n");
                goto release_line;
        }

        val = gpiod_line_get_value(line);
        if (val < 0) {
                perror("Read line input failed\n");
                goto release_line;
        }

        printf("GPIO %d is %d\n", line_num, val);
release_line:
        gpiod_line_release(line);
close_chip:
        gpiod_chip_close(chip);
end:
        return 0;
}