linux-imx

/*

 * lsgpio - example on how to list the GPIO lines on a system

 *

 * Copyright (C) 2015 Linus Walleij

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * Usage:

 *  lsgpio <-n device-name>

 */

​

#include <unistd.h>

#include <stdlib.h>

#include <stdbool.h>

#include <stdio.h>

#include <dirent.h>

#include <errno.h>

#include <string.h>

#include <poll.h>

#include <fcntl.h>

#include <getopt.h>

#include <sys/ioctl.h>

#include <linux/gpio.h>

​

#include "gpio-utils.h"

​

struct gpio_flag {

    char *name;

    unsigned long mask;

};

​

struct gpio_flag flagnames[] = {

    {

        .name = "kernel",

        .mask = GPIOLINE_FLAG_KERNEL,

    },

    {

        .name = "output",

        .mask = GPIOLINE_FLAG_IS_OUT,

    },

    {

        .name = "active-low",

        .mask = GPIOLINE_FLAG_ACTIVE_LOW,

    },

    {

        .name = "open-drain",

        .mask = GPIOLINE_FLAG_OPEN_DRAIN,

    },

    {

        .name = "open-source",

        .mask = GPIOLINE_FLAG_OPEN_SOURCE,

    },

};

​

void print_flags(unsigned long flags)

{

    int i;

    int printed = 0;

​

    for (i = 0; i < ARRAY_SIZE(flagnames); i++) {

        if (flags & flagnames[i].mask) {