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leds: Introduce devres helper for led_classdev_register 

(cooloney@gmail.com: add _unregister function into the document)

Suggested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Bjorn Andersson 2015-02-23 16:11:41 -08:00 committed by Bryan Wu
parent eb2294c343
commit ca1bb4ee4c
3 changed files with 65 additions and 0 deletions
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4
Documentation/driver-model/devres.txt
View File

@ -289,6 +289,10 @@ IRQ
devm_request_irq()
devm_request_threaded_irq()
LED
devm_led_classdev_register()
devm_led_classdev_unregister()
MDIO
devm_mdiobus_alloc()
devm_mdiobus_alloc_size()

57
drivers/leds/led-class.c
View File

@ -288,6 +288,63 @@ void led_classdev_unregister(struct led_classdev *led_cdev)
}
EXPORT_SYMBOL_GPL(led_classdev_unregister);
static void devm_led_classdev_release(struct device *dev, void *res)
{
led_classdev_unregister(*(struct led_classdev **)res);
}
/**
* devm_led_classdev_register - resource managed led_classdev_register()
* @parent: The device to register.
* @led_cdev: the led_classdev structure for this device.
*/
int devm_led_classdev_register(struct device *parent,
struct led_classdev *led_cdev)
{
struct led_classdev **dr;
int rc;
dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
rc = led_classdev_register(parent, led_cdev);
if (rc) {
devres_free(dr);
return rc;
}
*dr = led_cdev;
devres_add(parent, dr);
return 0;
}
EXPORT_SYMBOL_GPL(devm_led_classdev_register);
static int devm_led_classdev_match(struct device *dev, void *res, void *data)
{
struct led_cdev **p = res;
if (WARN_ON(!p || !*p))
return 0;
return *p == data;
}
/**
* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
* @parent: The device to unregister.
* @led_cdev: the led_classdev structure for this device.
*/
void devm_led_classdev_unregister(struct device *dev,
struct led_classdev *led_cdev)
{
WARN_ON(devres_release(dev,
devm_led_classdev_release,
devm_led_classdev_match, led_cdev));
}
EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
static int __init leds_init(void)
{
leds_class = class_create(THIS_MODULE, "leds");

4
include/linux/leds.h
View File

@ -105,7 +105,11 @@ struct led_classdev {
extern int led_classdev_register(struct device *parent,
struct led_classdev *led_cdev);
extern int devm_led_classdev_register(struct device *parent,
struct led_classdev *led_cdev);
extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern void devm_led_classdev_unregister(struct device *parent,
struct led_classdev *led_cdev);
extern void led_classdev_suspend(struct led_classdev *led_cdev);
extern void led_classdev_resume(struct led_classdev *led_cdev);