LED: Add led command

This patch allows controlling LEDs via the command line.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 98 insertions, 0 deletions

diff --git a/commands/Kconfig b/commands/Kconfig
index 54160737b8..64e08bb3bf 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -372,4 +372,11 @@ config CMD_I2C
 	  include i2c_probe, i2c_read and i2c_write commands to communicate
 	  on i2c bus.
 
+config CMD_LED
+	bool
+	depends on LED
+	prompt "led command"
+	help
+	  include led command to control LEDs
+
 endmenu
diff --git a/commands/Makefile b/commands/Makefile
index ca30b5f44d..0820483fd6 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -53,3 +53,4 @@ obj-$(CONFIG_CMD_UBI)		+= ubi.o
 obj-$(CONFIG_CMD_MENU)		+= menu.o
 obj-$(CONFIG_CMD_PASSWD)	+= passwd.o
 obj-$(CONFIG_CMD_LOGIN)		+= login.o
+obj-$(CONFIG_CMD_LED)		+= led.o
diff --git a/commands/led.c b/commands/led.c
new file mode 100644
index 0000000000..360ce7c77f
--- /dev/null
+++ b/commands/led.c
@@ -0,0 +1,90 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <led.h>
+#include <command.h>
+#include <getopt.h>
+#include <errno.h>
+
+static int do_led(struct command *cmdtp, int argc, char *argv[])
+{
+	unsigned long value;
+	struct led *led;
+	int ret;
+
+	if (argc == 1) {
+		int i = 0;
+
+		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;
+}
+
+/**
+ * @page led_command
+
+The exact meaning of <value> is unspecified. It can be a color in case of rgb
+LEDs or a brightness if this is controllable. In most cases only 1 for enabled
+is allowed.
+
+*/
+
+BAREBOX_CMD_HELP_START(led)
+BAREBOX_CMD_HELP_USAGE("led <led> <value>\n")
+BAREBOX_CMD_HELP_SHORT("control the value of a LED. a value of 0 means disabled\n")
+BAREBOX_CMD_HELP_SHORT("without arguments the available LEDs are listed\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(led)
+	.cmd		= do_led,
+	.usage		= "led <led> <value>",
+	BAREBOX_CMD_HELP(cmd_led_help)
+BAREBOX_CMD_END