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Commit ca1bb4ee authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Bryan Wu
Browse files

leds: Introduce devres helper for led_classdev_register 



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

Suggested-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent eb2294c3

Documentation/driver-model/devres.txt

+4 −0
Original line number Diff line number Diff line
@@ -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()

drivers/leds/led-class.c

+57 −0
Original line number Diff line number Diff line
@@ -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");

include/linux/leds.h

+4 −0
Original line number Diff line number Diff line
@@ -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);