/*
* 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)
+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);
+ down_write(&led_cdev->trigger_lock);
led_trigger_set(led_cdev, NULL);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
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;
}
-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;
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);
}
int led_trigger_register(struct led_trigger *trigger)
INIT_LIST_HEAD(&trigger->led_cdevs);
/* Add to the list of led triggers */
- write_lock(&triggers_list_lock);
+ down_write(&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);
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);
void led_trigger_register_simple(const char *name, struct led_trigger **tp)
{
struct led_trigger *trigger;
+ int err;
trigger = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
if (trigger) {
trigger->name = name;
- led_trigger_register(trigger);
- }
+ err = led_trigger_register(trigger);
+ if (err < 0)
+ printk(KERN_WARNING "LED trigger %s failed to register"
+ " (%d)\n", name, err);
+ } else
+ printk(KERN_WARNING "LED trigger %s failed to register"
+ " (no memory)\n", name);
+
*tp = trigger;
}
struct led_classdev *led_cdev;
/* Remove from the list of led triggers */
- write_lock(&triggers_list_lock);
+ down_write(&triggers_list_lock);
list_del(&trigger->next_trig);
- write_unlock(&triggers_list_lock);
+ up_write(&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);
+ down_write(&led_cdev->trigger_lock);
if (led_cdev->trigger == trigger)
led_trigger_set(led_cdev, NULL);
- write_unlock(&led_cdev->trigger_lock);
+ up_write(&led_cdev->trigger_lock);
}
read_unlock(&leds_list_lock);
}
void led_trigger_unregister_simple(struct led_trigger *trigger)
{
- led_trigger_unregister(trigger);
+ if (trigger)
+ led_trigger_unregister(trigger);
kfree(trigger);
}