linux-imx

    fprintf(stderr, "Usage: lsgpio [options]...\n"

        "List GPIO chips, lines and states\n"

        "  -n <name>  List GPIOs on a named device\n"

        "  -?         This helptext\n"

    );

}

​

int main(int argc, char **argv)

{

    int ret;

    int c;

​

    while ((c = getopt(argc, argv, "n:")) != -1) {

        switch (c) {

        case 'n':

            device_name = optarg;

            break;

        case '?':

            print_usage();