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leds: core: add managed version of led_trigger_register 

Complementing devm_led_classdev_register add a managed version of
led_trigger_register.

I omit a managed version of led_classdev_unregister as the equivalent
devm_led_classdev_unregister isn't used in the kernel as of today.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
hifive-unleashed-5.1
Heiner Kallweit 2016-01-02 01:36:41 +01:00 committed by Jacek Anaszewski
parent 1259efaab8
commit 9534cc31dd
2 changed files with 30 additions and 0 deletions
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28
drivers/leds/led-triggers.c
View File

@ -249,6 +249,34 @@ void led_trigger_unregister(struct led_trigger *trig)
}
EXPORT_SYMBOL_GPL(led_trigger_unregister);
static void devm_led_trigger_release(struct device *dev, void *res)
{
led_trigger_unregister(*(struct led_trigger **)res);
}
int devm_led_trigger_register(struct device *dev,
struct led_trigger *trig)
{
struct led_trigger **dr;
int rc;
dr = devres_alloc(devm_led_trigger_release, sizeof(*dr),
GFP_KERNEL);
if (!dr)
return -ENOMEM;
*dr = trig;
rc = led_trigger_register(trig);
if (rc)
devres_free(dr);
else
devres_add(dev, dr);
return rc;
}
EXPORT_SYMBOL_GPL(devm_led_trigger_register);
/* Simple LED Tigger Interface */
void led_trigger_event(struct led_trigger *trig,

2
include/linux/leds.h
View File

@ -246,6 +246,8 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
/* Registration functions for complex triggers */
extern int led_trigger_register(struct led_trigger *trigger);
extern void led_trigger_unregister(struct led_trigger *trigger);
extern int devm_led_trigger_register(struct device *dev,
struct led_trigger *trigger);
extern void led_trigger_register_simple(const char *name,
struct led_trigger **trigger);