[PATCH 3/8] basic LED support

[Sascha Hauer <s.hauer@pengutronix.de>]

This patch adds core functionality for controlling LEDs.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/Kconfig      |    1 +
 drivers/Makefile     |    1 +
 drivers/led/Kconfig  |    6 ++
 drivers/led/Makefile |    1 +
 drivers/led/core.c   |  157 ++++++++++++++++++++++++++++++++++++++++++++++++++
 include/led.h        |   27 +++++++++
 6 files changed, 193 insertions(+), 0 deletions(-)
 create mode 100644 drivers/led/Kconfig
 create mode 100644 drivers/led/Makefile
 create mode 100644 drivers/led/core.c
 create mode 100644 include/led.h

diff --git a/drivers/Kconfig b/drivers/Kconfig
index d94017b..86d8fb5 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -12,5 +12,6 @@ source "drivers/video/Kconfig"
 source "drivers/mci/Kconfig"
 source "drivers/clk/Kconfig"
 source "drivers/mfd/Kconfig"
+source "drivers/led/Kconfig"
 
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 242a564..b1b402f 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_MCI) += mci/
 obj-$(CONFIG_VIDEO) += video/
 obj-y	+= clk/
 obj-y	+= mfd/
+obj-$(CONFIG_LED) += led/
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
new file mode 100644
index 0000000..964626c
--- /dev/null
+++ b/drivers/led/Kconfig
@@ -0,0 +1,6 @@
+menuconfig LED
+	bool "LED support"
+
+if LED
+
+endif
diff --git a/drivers/led/Makefile b/drivers/led/Makefile
new file mode 100644
index 0000000..0c1a6b6
--- /dev/null
+++ b/drivers/led/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_LED) += core.o
diff --git a/drivers/led/core.c b/drivers/led/core.c
new file mode 100644
index 0000000..748a978
--- /dev/null
+++ b/drivers/led/core.c
@@ -0,0 +1,157 @@
+/*
+ * core LED 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 <command.h>
+#include <linux/list.h>
+#include <errno.h>
+#include <asm/gpio.h>
+#include <led.h>
+#include <poller.h>
+#include <clock.h>
+#include <linux/ctype.h>
+
+/**
+ * @file
+ * @brief LED framework
+ *
+ * This file contains the core LED framework for barebox.
+ *
+ * Each LED can be set to a value where 0 means disabled and values
+ * > 0 mean enabled. LEDs can have different enable values where the
+ * exact meaning depends on the LED, for example a gpio controlled rgb
+ * LED can have enable values from 1 to 7 which correspond to different
+ * colors. value could also mean a brightness.
+ * Each LED is assigned a number. numbers start with 0 and are increased
+ * with each registered LED. The number stays the same during lifecycle,
+ * gaps because of unregistered LEDs are not filled up.
+ */
+
+static LIST_HEAD(leds);
+static int num_leds;
+
+/**
+ * led_by_number - get the number of a LED
+ * @param num number of the LED to return
+ */
+struct led *led_by_number(int num)
+{
+	struct led *led;
+
+	list_for_each_entry(led, &leds, list) {
+		if (led->num == num)
+			return led;
+	}
+
+	return NULL;
+}
+
+/**
+ * led_by_name - get a LED with its name
+ * @param name	name of the LED
+ */
+struct led *led_by_name(const char *name)
+{
+	struct led *led;
+
+	list_for_each_entry(led, &leds, list) {
+		if (led->name && !strcmp(led->name, name))
+			return led;
+	}
+
+	return NULL;
+}
+
+/**
+ * led_by_name_or_number - get a LED with its name or number
+ * @param str	if first character of str is a digit led_by_number
+ *		is returned, led_by_name otherwise.
+ */
+struct led *led_by_name_or_number(const char *str)
+{
+	if (isdigit(*str)) {
+		int l;
+
+		l = simple_strtoul(str, NULL, 0);
+
+		return led_by_number(l);
+	} else {
+		return led_by_name(str);
+	}
+}
+
+/**
+ * led_set - set the value of a LED
+ * @param led	the led
+ * @param value	the value of the LED (0 is disabled)
+ */
+int led_set(struct led *led, unsigned int value)
+{
+	if (value > led->max_value)
+		value = led->max_value;
+
+	led->set(led, value);
+
+	return 0;
+}
+
+/**
+ * led_set_num - set the value of a LED
+ * @param num	the number of the LED
+ * @param value	the value of the LED (0 is disabled)
+ */
+int led_set_num(int num, unsigned int value)
+{
+	struct led *led = led_by_number(num);
+
+	if (!led)
+		return -ENODEV;
+
+	return led_set(led, value);
+}
+
+/**
+ * led_register - Register a LED
+ * @param led	the led
+ */
+int led_register(struct led *led)
+{
+	if (led->name && led_by_name(led->name))
+		return -EBUSY;
+
+	led->num = num_leds++;
+
+	list_add_tail(&led->list, &leds);
+
+	return 0;
+}
+
+/**
+ * led_unregister - Unegister a LED
+ * @param led	the led
+ */
+void led_unregister(struct led *led)
+{
+	list_del(&led->list);
+}
diff --git a/include/led.h b/include/led.h
new file mode 100644
index 0000000..3e7b1d9
--- /dev/null
+++ b/include/led.h
@@ -0,0 +1,27 @@
+#ifndef __LED_H
+#define __LED_H
+
+struct led {
+	void (*set)(struct led *, unsigned int value);
+	int max_value;
+	char *name;
+	int num;
+	struct list_head list;
+};
+
+struct led *led_by_number(int no);
+struct led *led_by_name(const char *name);
+struct led *led_by_name_or_number(const char *str);
+
+static inline int led_get_number(struct led *led)
+{
+	return led->num;
+}
+
+int led_set_num(int num, unsigned int value);
+int led_set(struct led *led, unsigned int value);
+int led_register(struct led *led);
+void led_unregister(struct led *led);
+void led_unregister(struct led *led);
+
+#endif /* __LED_H */
-- 
1.7.2.3


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