lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] LED: add LED trigger tupport

Browse Source 
Add support for LED triggers to the LED subsystem.  "Triggers" are events
which change the state of an LED.  Two kinds of trigger are available, simple
ones which can be added to exising code with minimum disruption and complex
ones for implementing new or more complex functionality.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Richard Purdie
2006-03-31 02:31:05 -08:00
committed by Linus Torvalds
parent c72a1d608d
commit c3bc9956ec
6 changed files with 333 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/leds/led-class.c
View File

@ -54,6 +54,9 @@ static ssize_t led_brightness_store(struct class_device *dev,
static CLASS_DEVICE_ATTR(brightness, 0644, led_brightness_show,
led_brightness_store);
#ifdef CONFIG_LEDS_TRIGGERS
static CLASS_DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
#endif
/**
* led_classdev_suspend - suspend an led_classdev.
@ -100,6 +103,15 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
list_add_tail(&led_cdev->node, &leds_list);
write_unlock(&leds_list_lock);
#ifdef CONFIG_LEDS_TRIGGERS
rwlock_init(&led_cdev->trigger_lock);
led_trigger_set_default(led_cdev);
class_device_create_file(led_cdev->class_dev,
&class_device_attr_trigger);
#endif
printk(KERN_INFO "Registered led device: %s\n",
led_cdev->class_dev->class_id);
@ -117,6 +129,14 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
{
class_device_remove_file(led_cdev->class_dev,
&class_device_attr_brightness);
#ifdef CONFIG_LEDS_TRIGGERS
class_device_remove_file(led_cdev->class_dev,
&class_device_attr_trigger);
write_lock(&led_cdev->trigger_lock);
if (led_cdev->trigger)
led_trigger_set(led_cdev, NULL);
write_unlock(&led_cdev->trigger_lock);
#endif
class_device_unregister(led_cdev->class_dev);