blob: 32b78529c8c204adbda9cb117437485da5ed5d50 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
#include <dirent.h>
#include <errno.h>
#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)
{
int i, num_chips, optc, opti, offset;
struct gpiod_chip *chip;
struct dirent **entries;
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");
num_chips = scandir("/dev/", &entries, chip_dir_filter, alphasort);
if (num_chips < 0)
die_perror("unable to scan /dev");
for (i = 0; i < num_chips; i++) {
chip = chip_open_by_name(entries[i]->d_name);
if (!chip) {
if (errno == EACCES)
continue;
die_perror("unable to open %s", entries[i]->d_name);
}
offset = gpiod_chip_find_line(chip, argv[0]);
if (offset >= 0) {
printf("%s %u\n",
gpiod_chip_get_name(chip), offset);
gpiod_chip_unref(chip);
return EXIT_SUCCESS;
}
}
return EXIT_FAILURE;
}