/*
* LED Triggers Core
*
- * Copyright 2005-2006 Openedhand Ltd.
+ * Copyright 2005-2007 Openedhand Ltd.
*
* Author: Richard Purdie <rpurdie@openedhand.com>
*
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
+#include <linux/rwsem.h>
#include <linux/leds.h>
#include "leds.h"
/*
* Nests outside led_cdev->trigger_lock
*/
-static DEFINE_RWLOCK(triggers_list_lock);
+static DECLARE_RWSEM(triggers_list_lock);
static LIST_HEAD(trigger_list);
-ssize_t led_trigger_store(struct class_device *dev, const char *buf,
- size_t count)
+ /* Used by LED Class */
+
+ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
{
- struct led_classdev *led_cdev = class_get_devdata(dev);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
char trigger_name[TRIG_NAME_MAX];
struct led_trigger *trig;
size_t len;
trigger_name[len - 1] = '\0';
if (!strcmp(trigger_name, "none")) {
- write_lock(&led_cdev->trigger_lock);
- led_trigger_set(led_cdev, NULL);
- write_unlock(&led_cdev->trigger_lock);
+ led_trigger_remove(led_cdev);
return count;
}
- read_lock(&triggers_list_lock);
+ down_read(&triggers_list_lock);
list_for_each_entry(trig, &trigger_list, next_trig) {
if (!strcmp(trigger_name, trig->name)) {
- write_lock(&led_cdev->trigger_lock);
+ down_write(&led_cdev->trigger_lock);
led_trigger_set(led_cdev, trig);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
- read_unlock(&triggers_list_lock);
+ up_read(&triggers_list_lock);
return count;
}
}
- read_unlock(&triggers_list_lock);
+ up_read(&triggers_list_lock);
return -EINVAL;
}
+EXPORT_SYMBOL_GPL(led_trigger_store);
-
-ssize_t led_trigger_show(struct class_device *dev, char *buf)
+ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- struct led_classdev *led_cdev = class_get_devdata(dev);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct led_trigger *trig;
int len = 0;
- read_lock(&triggers_list_lock);
- read_lock(&led_cdev->trigger_lock);
+ down_read(&triggers_list_lock);
+ down_read(&led_cdev->trigger_lock);
if (!led_cdev->trigger)
len += sprintf(buf+len, "[none] ");
else
len += sprintf(buf+len, "%s ", trig->name);
}
- read_unlock(&led_cdev->trigger_lock);
- read_unlock(&triggers_list_lock);
+ up_read(&led_cdev->trigger_lock);
+ up_read(&triggers_list_lock);
len += sprintf(len+buf, "\n");
return len;
}
-
-void led_trigger_event(struct led_trigger *trigger,
- enum led_brightness brightness)
-{
- struct list_head *entry;
-
- if (!trigger)
- return;
-
- read_lock(&trigger->leddev_list_lock);
- list_for_each(entry, &trigger->led_cdevs) {
- struct led_classdev *led_cdev;
-
- led_cdev = list_entry(entry, struct led_classdev, trig_list);
- led_set_brightness(led_cdev, brightness);
- }
- read_unlock(&trigger->leddev_list_lock);
-}
+EXPORT_SYMBOL_GPL(led_trigger_show);
/* Caller must ensure led_cdev->trigger_lock held */
void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
if (led_cdev->trigger) {
write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
list_del(&led_cdev->trig_list);
- write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags);
+ write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
+ flags);
if (led_cdev->trigger->deactivate)
led_cdev->trigger->deactivate(led_cdev);
+ led_cdev->trigger = NULL;
led_set_brightness(led_cdev, LED_OFF);
}
if (trigger) {
write_lock_irqsave(&trigger->leddev_list_lock, flags);
list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs);
write_unlock_irqrestore(&trigger->leddev_list_lock, flags);
+ led_cdev->trigger = trigger;
if (trigger->activate)
trigger->activate(led_cdev);
}
- led_cdev->trigger = trigger;
}
+EXPORT_SYMBOL_GPL(led_trigger_set);
+
+void led_trigger_remove(struct led_classdev *led_cdev)
+{
+ down_write(&led_cdev->trigger_lock);
+ led_trigger_set(led_cdev, NULL);
+ up_write(&led_cdev->trigger_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_remove);
void led_trigger_set_default(struct led_classdev *led_cdev)
{
if (!led_cdev->default_trigger)
return;
- read_lock(&triggers_list_lock);
- write_lock(&led_cdev->trigger_lock);
+ down_read(&triggers_list_lock);
+ down_write(&led_cdev->trigger_lock);
list_for_each_entry(trig, &trigger_list, next_trig) {
if (!strcmp(led_cdev->default_trigger, trig->name))
led_trigger_set(led_cdev, trig);
}
- write_unlock(&led_cdev->trigger_lock);
- read_unlock(&triggers_list_lock);
+ up_write(&led_cdev->trigger_lock);
+ up_read(&triggers_list_lock);
}
+EXPORT_SYMBOL_GPL(led_trigger_set_default);
+
+/* LED Trigger Interface */
int led_trigger_register(struct led_trigger *trigger)
{
struct led_classdev *led_cdev;
+ struct led_trigger *trig;
rwlock_init(&trigger->leddev_list_lock);
INIT_LIST_HEAD(&trigger->led_cdevs);
+ down_write(&triggers_list_lock);
+ /* Make sure the trigger's name isn't already in use */
+ list_for_each_entry(trig, &trigger_list, next_trig) {
+ if (!strcmp(trig->name, trigger->name)) {
+ up_write(&triggers_list_lock);
+ return -EEXIST;
+ }
+ }
/* Add to the list of led triggers */
- write_lock(&triggers_list_lock);
list_add_tail(&trigger->next_trig, &trigger_list);
- write_unlock(&triggers_list_lock);
+ up_write(&triggers_list_lock);
/* Register with any LEDs that have this as a default trigger */
- read_lock(&leds_list_lock);
+ down_read(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
- write_lock(&led_cdev->trigger_lock);
+ down_write(&led_cdev->trigger_lock);
if (!led_cdev->trigger && led_cdev->default_trigger &&
!strcmp(led_cdev->default_trigger, trigger->name))
led_trigger_set(led_cdev, trigger);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
}
- read_unlock(&leds_list_lock);
+ up_read(&leds_list_lock);
return 0;
}
+EXPORT_SYMBOL_GPL(led_trigger_register);
+
+void led_trigger_unregister(struct led_trigger *trigger)
+{
+ struct led_classdev *led_cdev;
+
+ /* Remove from the list of led triggers */
+ down_write(&triggers_list_lock);
+ list_del(&trigger->next_trig);
+ up_write(&triggers_list_lock);
+
+ /* Remove anyone actively using this trigger */
+ down_read(&leds_list_lock);
+ list_for_each_entry(led_cdev, &leds_list, node) {
+ down_write(&led_cdev->trigger_lock);
+ if (led_cdev->trigger == trigger)
+ led_trigger_set(led_cdev, NULL);
+ up_write(&led_cdev->trigger_lock);
+ }
+ up_read(&leds_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_unregister);
+
+/* Simple LED Tigger Interface */
+
+void led_trigger_event(struct led_trigger *trigger,
+ enum led_brightness brightness)
+{
+ struct list_head *entry;
+
+ if (!trigger)
+ return;
+
+ read_lock(&trigger->leddev_list_lock);
+ list_for_each(entry, &trigger->led_cdevs) {
+ struct led_classdev *led_cdev;
+
+ led_cdev = list_entry(entry, struct led_classdev, trig_list);
+ led_set_brightness(led_cdev, brightness);
+ }
+ read_unlock(&trigger->leddev_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_event);
void led_trigger_register_simple(const char *name, struct led_trigger **tp)
{
*tp = trigger;
}
-
-void led_trigger_unregister(struct led_trigger *trigger)
-{
- struct led_classdev *led_cdev;
-
- /* Remove from the list of led triggers */
- write_lock(&triggers_list_lock);
- list_del(&trigger->next_trig);
- write_unlock(&triggers_list_lock);
-
- /* Remove anyone actively using this trigger */
- read_lock(&leds_list_lock);
- list_for_each_entry(led_cdev, &leds_list, node) {
- write_lock(&led_cdev->trigger_lock);
- if (led_cdev->trigger == trigger)
- led_trigger_set(led_cdev, NULL);
- write_unlock(&led_cdev->trigger_lock);
- }
- read_unlock(&leds_list_lock);
-}
+EXPORT_SYMBOL_GPL(led_trigger_register_simple);
void led_trigger_unregister_simple(struct led_trigger *trigger)
{
led_trigger_unregister(trigger);
kfree(trigger);
}
-
-/* Used by LED Class */
-EXPORT_SYMBOL_GPL(led_trigger_set);
-EXPORT_SYMBOL_GPL(led_trigger_set_default);
-EXPORT_SYMBOL_GPL(led_trigger_show);
-EXPORT_SYMBOL_GPL(led_trigger_store);
-
-/* LED Trigger Interface */
-EXPORT_SYMBOL_GPL(led_trigger_register);
-EXPORT_SYMBOL_GPL(led_trigger_unregister);
-
-/* Simple LED Tigger Interface */
-EXPORT_SYMBOL_GPL(led_trigger_register_simple);
EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);
-EXPORT_SYMBOL_GPL(led_trigger_event);
MODULE_AUTHOR("Richard Purdie");
MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff