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@@ -0,0 +1,147 @@
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+/*
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+ * LED Class Core
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+ *
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+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
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+ * Copyright (C) 2005-2006 Richard Purdie <rpurdie@openedhand.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/config.h>
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/list.h>
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+#include <linux/spinlock.h>
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+#include <linux/device.h>
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+#include <linux/sysdev.h>
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+#include <linux/timer.h>
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+#include <linux/err.h>
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+#include <linux/leds.h>
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+#include "leds.h"
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+
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+static struct class *leds_class;
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+
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+static ssize_t led_brightness_show(struct class_device *dev, char *buf)
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+{
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+ struct led_classdev *led_cdev = class_get_devdata(dev);
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+ ssize_t ret = 0;
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+
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+ /* no lock needed for this */
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+ sprintf(buf, "%u\n", led_cdev->brightness);
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+ ret = strlen(buf) + 1;
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+
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+ return ret;
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+}
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+
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+static ssize_t led_brightness_store(struct class_device *dev,
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+ const char *buf, size_t size)
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+{
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+ struct led_classdev *led_cdev = class_get_devdata(dev);
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+ ssize_t ret = -EINVAL;
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+ char *after;
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+ unsigned long state = simple_strtoul(buf, &after, 10);
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+
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+ if (after - buf > 0) {
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+ ret = after - buf;
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+ led_set_brightness(led_cdev, state);
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+ }
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+
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+ return ret;
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+}
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+
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+static CLASS_DEVICE_ATTR(brightness, 0644, led_brightness_show,
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+ led_brightness_store);
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+
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+/**
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+ * led_classdev_suspend - suspend an led_classdev.
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+ * @led_cdev: the led_classdev to suspend.
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+ */
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+void led_classdev_suspend(struct led_classdev *led_cdev)
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+{
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+ led_cdev->flags |= LED_SUSPENDED;
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+ led_cdev->brightness_set(led_cdev, 0);
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+}
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+EXPORT_SYMBOL_GPL(led_classdev_suspend);
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+
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+/**
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+ * led_classdev_resume - resume an led_classdev.
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+ * @led_cdev: the led_classdev to resume.
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+ */
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+void led_classdev_resume(struct led_classdev *led_cdev)
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+{
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+ led_cdev->brightness_set(led_cdev, led_cdev->brightness);
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+ led_cdev->flags &= ~LED_SUSPENDED;
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+}
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+EXPORT_SYMBOL_GPL(led_classdev_resume);
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+
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+/**
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+ * led_classdev_register - register a new object of led_classdev class.
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+ * @dev: The device to register.
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+ * @led_cdev: the led_classdev structure for this device.
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+ */
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+int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
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+{
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+ led_cdev->class_dev = class_device_create(leds_class, NULL, 0,
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+ parent, "%s", led_cdev->name);
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+ if (unlikely(IS_ERR(led_cdev->class_dev)))
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+ return PTR_ERR(led_cdev->class_dev);
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+
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+ class_set_devdata(led_cdev->class_dev, led_cdev);
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+
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+ /* register the attributes */
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+ class_device_create_file(led_cdev->class_dev,
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+ &class_device_attr_brightness);
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+
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+ /* add to the list of leds */
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+ write_lock(&leds_list_lock);
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+ list_add_tail(&led_cdev->node, &leds_list);
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+ write_unlock(&leds_list_lock);
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+
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+ printk(KERN_INFO "Registered led device: %s\n",
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+ led_cdev->class_dev->class_id);
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(led_classdev_register);
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+
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+/**
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+ * led_classdev_unregister - unregisters a object of led_properties class.
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+ * @led_cdev: the led device to unreigister
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+ *
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+ * Unregisters a previously registered via led_classdev_register object.
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+ */
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+void led_classdev_unregister(struct led_classdev *led_cdev)
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+{
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+ class_device_remove_file(led_cdev->class_dev,
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+ &class_device_attr_brightness);
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+
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+ class_device_unregister(led_cdev->class_dev);
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+
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+ write_lock(&leds_list_lock);
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+ list_del(&led_cdev->node);
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+ write_unlock(&leds_list_lock);
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+}
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+EXPORT_SYMBOL_GPL(led_classdev_unregister);
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+
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+static int __init leds_init(void)
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+{
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+ leds_class = class_create(THIS_MODULE, "leds");
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+ if (IS_ERR(leds_class))
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+ return PTR_ERR(leds_class);
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+ return 0;
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+}
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+
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+static void __exit leds_exit(void)
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+{
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+ class_destroy(leds_class);
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+}
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+
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+subsys_initcall(leds_init);
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+module_exit(leds_exit);
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+
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+MODULE_AUTHOR("John Lenz, Richard Purdie");
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("LED Class Interface");
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Richard Purdie