barebox/commands/led.c

/*
 * LED command support for barebox
 *
 * (C) Copyright 2010 Sascha Hauer, Pengutronix
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>
#include <led.h>
#include <command.h>
#include <getopt.h>
#include <errno.h>

static int do_led(int argc, char *argv[])
{
	unsigned long value;
	struct led *led;
	int ret;

	if (argc == 1) {
		int i = 0;

		led = led_by_number(i);
		if (!led) {
			printf("no registered LEDs\n");
			return COMMAND_ERROR;
		}

		printf("registered LEDs:\n");

		while ((led = led_by_number(i))) {
			printf("%-2d: name: %-10s max_value: %d\n",
					i, led->name ? led->name : "none",
					led->max_value);
			i++;
		}
		return 0;
	}

	if (argc != 3)
		return COMMAND_ERROR_USAGE;

	led = led_by_name_or_number(argv[1]);
	if (!led) {
		printf("no such LED: %s\n", argv[1]);
		return 1;
	}

	value = simple_strtoul(argv[optind + 1], NULL, 0);

	ret = led_set(led, value);
	if (ret < 0) {
		perror("led");
		return 1;
	}

	return 0;
}

BAREBOX_CMD_HELP_START(led)
BAREBOX_CMD_HELP_TEXT("Control the value of a LED. The exact meaning of VALUE is unspecified,")
BAREBOX_CMD_HELP_TEXT("it can be a brightness, or a color. Most often a value of '1' means on")
BAREBOX_CMD_HELP_TEXT("and '0' means off.")
BAREBOX_CMD_HELP_TEXT("")
BAREBOX_CMD_HELP_TEXT("Without arguments the available LEDs are listed.")
BAREBOX_CMD_HELP_END

BAREBOX_CMD_START(led)
	.cmd		= do_led,
	BAREBOX_CMD_DESC("control LEDs")
	BAREBOX_CMD_OPTS("LED VALUE")
	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
	BAREBOX_CMD_HELP(cmd_led_help)
BAREBOX_CMD_END