blob: 931ac40db3134044bed5acf231fb0dbb585955f7 [file] [log] [blame]
// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* This file is part of libgpiod.
*
* Copyright (C) 2017-2018 Bartosz Golaszewski <bartekgola@gmail.com>
*/
#include <getopt.h>
#include <gpiod.h>
#include <stdio.h>
#include <string.h>
#include "tools-common.h"
static const struct option longopts[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'v' },
{ GETOPT_NULL_LONGOPT },
};
static const char *const shortopts = "+hv";
static void print_help(void)
{
printf("Usage: %s [OPTIONS] <name>\n", get_progname());
printf("\n");
printf("Find a GPIO line by name. The output of this command can be used as input for gpioget/set.\n");
printf("\n");
printf("Options:\n");
printf(" -h, --help:\t\tdisplay this message and exit\n");
printf(" -v, --version:\tdisplay the version and exit\n");
}
int main(int argc, char **argv)
{
unsigned int offset;
int optc, opti, rv;
char chip[32];
for (;;) {
optc = getopt_long(argc, argv, shortopts, longopts, &opti);
if (optc < 0)
break;
switch (optc) {
case 'h':
print_help();
return EXIT_SUCCESS;
case 'v':
print_version();
return EXIT_SUCCESS;
case '?':
die("try %s --help", get_progname());
default:
abort();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
die("exactly one GPIO line name must be specified");
rv = gpiod_ctxless_find_line(argv[0], chip, sizeof(chip), &offset);
if (rv < 0)
die_perror("error performing the line lookup");
else if (rv == 0)
return EXIT_FAILURE;
printf("%s %u\n", chip, offset);
return EXIT_SUCCESS;
}