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Subject[PATCH -mm 1/4] LED: Add LED Class
From
Date
From: Richard Purdie <rpurdie@rpsys.net>

Add the foundations of a new LEDs subsystem. This patch adds a class which
presents LED devices within sysfs and allows their brightness to be
controlled.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

Index: linux-2.6.16/arch/arm/Kconfig
===================================================================
--- linux-2.6.16.orig/arch/arm/Kconfig 2006-03-20 05:53:29.000000000 +0000
+++ linux-2.6.16/arch/arm/Kconfig 2006-03-27 23:36:45.000000000 +0100
@@ -809,6 +809,8 @@

source "drivers/mfd/Kconfig"

+source "drivers/leds/Kconfig"
+
source "drivers/media/Kconfig"

source "drivers/video/Kconfig"
Index: linux-2.6.16/drivers/Kconfig
===================================================================
--- linux-2.6.16.orig/drivers/Kconfig 2006-03-20 05:53:29.000000000 +0000
+++ linux-2.6.16/drivers/Kconfig 2006-03-27 23:36:45.000000000 +0100
@@ -64,6 +64,8 @@

source "drivers/mmc/Kconfig"

+source "drivers/leds/Kconfig"
+
source "drivers/infiniband/Kconfig"

source "drivers/sn/Kconfig"
Index: linux-2.6.16/drivers/leds/Kconfig
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.16/drivers/leds/Kconfig 2006-03-27 23:36:51.000000000 +0100
@@ -0,0 +1,18 @@
+
+menu "LED devices"
+
+config NEW_LEDS
+ bool "LED Support"
+ help
+ Say Y to enable Linux LED support. This is not related to standard
+ keyboard LEDs which are controlled via the input system.
+
+config LEDS_CLASS
+ tristate "LED Class Support"
+ depends NEW_LEDS
+ help
+ This option enables the led sysfs class in /sys/class/leds. You'll
+ need this to do anything useful with LEDs. If unsure, say N.
+
+endmenu
+
Index: linux-2.6.16/drivers/leds/led-class.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.16/drivers/leds/led-class.c 2006-03-28 13:16:55.000000000 +0100
@@ -0,0 +1,147 @@
+/*
+ * LED Class Core
+ *
+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
+ * Copyright (C) 2005-2006 Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/sysdev.h>
+#include <linux/timer.h>
+#include <linux/err.h>
+#include <linux/leds.h>
+#include "leds.h"
+
+static struct class *leds_class;
+
+static ssize_t led_brightness_show(struct class_device *dev, char *buf)
+{
+ struct led_classdev *led_cdev = class_get_devdata(dev);
+ ssize_t ret = 0;
+
+ /* no lock needed for this */
+ sprintf(buf, "%u\n", led_cdev->brightness);
+ ret = strlen(buf) + 1;
+
+ return ret;
+}
+
+static ssize_t led_brightness_store(struct class_device *dev,
+ const char *buf, size_t size)
+{
+ struct led_classdev *led_cdev = class_get_devdata(dev);
+ ssize_t ret = -EINVAL;
+ char *after;
+ unsigned long state = simple_strtoul(buf, &after, 10);
+
+ if (after - buf > 0) {
+ ret = after - buf;
+ led_set_brightness(led_cdev, state);
+ }
+
+ return ret;
+}
+
+static CLASS_DEVICE_ATTR(brightness, 0644, led_brightness_show,
+ led_brightness_store);
+
+/**
+ * led_classdev_suspend - suspend an led_classdev.
+ * @led_cdev: the led_classdev to suspend.
+ */
+void led_classdev_suspend(struct led_classdev *led_cdev)
+{
+ led_cdev->flags |= LED_SUSPENDED;
+ led_cdev->brightness_set(led_cdev, 0);
+}
+EXPORT_SYMBOL_GPL(led_classdev_suspend);
+
+/**
+ * led_classdev_resume - resume an led_classdev.
+ * @led_cdev: the led_classdev to resume.
+ */
+void led_classdev_resume(struct led_classdev *led_cdev)
+{
+ led_cdev->brightness_set(led_cdev, led_cdev->brightness);
+ led_cdev->flags &= ~LED_SUSPENDED;
+}
+EXPORT_SYMBOL_GPL(led_classdev_resume);
+
+/**
+ * led_classdev_register - register a new object of led_classdev class.
+ * @dev: The device to register.
+ * @led_cdev: the led_classdev structure for this device.
+ */
+int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
+{
+ led_cdev->class_dev = class_device_create(leds_class, NULL, 0,
+ parent, "%s", led_cdev->name);
+ if (unlikely(IS_ERR(led_cdev->class_dev)))
+ return PTR_ERR(led_cdev->class_dev);
+
+ class_set_devdata(led_cdev->class_dev, led_cdev);
+
+ /* register the attributes */
+ class_device_create_file(led_cdev->class_dev,
+ &class_device_attr_brightness);
+
+ /* add to the list of leds */
+ write_lock(&leds_list_lock);
+ list_add_tail(&led_cdev->node, &leds_list);
+ write_unlock(&leds_list_lock);
+
+ printk(KERN_INFO "Registered led device: %s\n",
+ led_cdev->class_dev->class_id);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(led_classdev_register);
+
+/**
+ * led_classdev_unregister - unregisters a object of led_properties class.
+ * @led_cdev: the led device to unreigister
+ *
+ * Unregisters a previously registered via led_classdev_register object.
+ */
+void led_classdev_unregister(struct led_classdev *led_cdev)
+{
+ class_device_remove_file(led_cdev->class_dev,
+ &class_device_attr_brightness);
+
+ class_device_unregister(led_cdev->class_dev);
+
+ write_lock(&leds_list_lock);
+ list_del(&led_cdev->node);
+ write_unlock(&leds_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_classdev_unregister);
+
+static int __init leds_init(void)
+{
+ leds_class = class_create(THIS_MODULE, "leds");
+ if (IS_ERR(leds_class))
+ return PTR_ERR(leds_class);
+ return 0;
+}
+
+static void __exit leds_exit(void)
+{
+ class_destroy(leds_class);
+}
+
+subsys_initcall(leds_init);
+module_exit(leds_exit);
+
+MODULE_AUTHOR("John Lenz, Richard Purdie");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LED Class Interface");
Index: linux-2.6.16/drivers/leds/led-core.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.16/drivers/leds/led-core.c 2006-03-23 22:10:48.000000000 +0000
@@ -0,0 +1,25 @@
+/*
+ * LED Class Core
+ *
+ * Copyright 2005-2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/leds.h>
+#include "leds.h"
+
+rwlock_t leds_list_lock = RW_LOCK_UNLOCKED;
+LIST_HEAD(leds_list);
+
+EXPORT_SYMBOL_GPL(leds_list);
+EXPORT_SYMBOL_GPL(leds_list_lock);
Index: linux-2.6.16/drivers/leds/leds.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.16/drivers/leds/leds.h 2006-03-28 13:17:36.000000000 +0100
@@ -0,0 +1,31 @@
+/*
+ * LED Core
+ *
+ * Copyright 2005 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#ifndef __LEDS_H_INCLUDED
+#define __LEDS_H_INCLUDED
+
+#include <linux/leds.h>
+
+static inline void led_set_brightness(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ if (value > LED_FULL)
+ value = LED_FULL;
+ led_cdev->brightness = value;
+ if (!(led_cdev->flags & LED_SUSPENDED))
+ led_cdev->brightness_set(led_cdev, value);
+}
+
+extern rwlock_t leds_list_lock;
+extern struct list_head leds_list;
+
+#endif /* __LEDS_H_INCLUDED */
Index: linux-2.6.16/drivers/leds/Makefile
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.16/drivers/leds/Makefile 2006-03-27 23:36:51.000000000 +0100
@@ -0,0 +1,4 @@
+
+# LED Core
+obj-$(CONFIG_NEW_LEDS) += led-core.o
+obj-$(CONFIG_LEDS_CLASS) += led-class.o
Index: linux-2.6.16/drivers/Makefile
===================================================================
--- linux-2.6.16.orig/drivers/Makefile 2006-03-20 05:53:29.000000000 +0000
+++ linux-2.6.16/drivers/Makefile 2006-03-27 23:36:45.000000000 +0100
@@ -68,6 +68,7 @@
obj-$(CONFIG_EISA) += eisa/
obj-$(CONFIG_CPU_FREQ) += cpufreq/
obj-$(CONFIG_MMC) += mmc/
+obj-$(CONFIG_NEW_LEDS) += leds/
obj-$(CONFIG_INFINIBAND) += infiniband/
obj-$(CONFIG_SGI_SN) += sn/
obj-y += firmware/
Index: linux-2.6.16/include/linux/leds.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.16/include/linux/leds.h 2006-03-28 13:14:37.000000000 +0100
@@ -0,0 +1,51 @@
+/*
+ * Driver model for leds and led triggers
+ *
+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
+ * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#ifndef __LINUX_LEDS_H_INCLUDED
+#define __LINUX_LEDS_H_INCLUDED
+
+struct device;
+struct class_device;
+/*
+ * LED Core
+ */
+
+enum led_brightness {
+ LED_OFF = 0,
+ LED_HALF = 127,
+ LED_FULL = 255,
+};
+
+struct led_classdev {
+ const char *name;
+ int brightness;
+ int flags;
+#define LED_SUSPENDED (1 << 0)
+
+ /* A function to set the brightness of the led */
+ void (*brightness_set)(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+
+ struct class_device *class_dev;
+ /* LED Device linked list */
+ struct list_head node;
+
+ /* Trigger data */
+ char *default_trigger;
+};
+
+extern int led_classdev_register(struct device *parent,
+ struct led_classdev *led_cdev);
+extern void led_classdev_unregister(struct led_classdev *led_cdev);
+extern void led_classdev_suspend(struct led_classdev *led_cdev);
+extern void led_classdev_resume(struct led_classdev *led_cdev);
+
+#endif /* __LINUX_LEDS_H_INCLUDED */

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