| // 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_name(chip), offset); |
| gpiod_chip_close(chip); |
| return EXIT_SUCCESS; |
| } |
| } |
| |
| return EXIT_FAILURE; |
| } |