leds: Add managed API to get a LED from a device driver (e389240a) · Commits · 戴 / test

drivers/leds/led-class.c

+49 −0

Original line number	Diff line number	Diff line
		@@ -258,6 +258,55 @@ void led_put(struct led_classdev *led_cdev)
		}
		EXPORT_SYMBOL_GPL(led_put);

		static void devm_led_release(struct device dev, void res)
		{
		struct led_classdev **p = res;

		led_put(*p);
		}

		/**
		* devm_of_led_get - Resource-managed request of a LED device
		* @dev: LED consumer
		* @index: index of the LED to obtain in the consumer
		*
		* The device node of the device is parse to find the request LED device.
		* The LED device returned from this function is automatically released
		* on driver detach.
		*
		* @return a pointer to a LED device or ERR_PTR(errno) on failure.
		*/
		struct led_classdev __must_check devm_of_led_get(struct device dev,
		int index)
		{
		struct led_classdev *led;
		struct led_classdev **dr;

		if (!dev)
		return ERR_PTR(-EINVAL);

		/* Not using device tree? */
		if (!IS_ENABLED(CONFIG_OF) \|\| !dev->of_node)
		return ERR_PTR(-ENOTSUPP);

		led = of_led_get(dev->of_node, index);
		if (IS_ERR(led))
		return led;

		dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *),
		GFP_KERNEL);
		if (!dr) {
		led_put(led);
		return ERR_PTR(-ENOMEM);
		}

		*dr = led;
		devres_add(dev, dr);

		return led;
		}
		EXPORT_SYMBOL_GPL(devm_of_led_get);

		static int led_classdev_next_name(const char init_name, char name,
		size_t len)
		{

+2 −0

Original line number	Diff line number	Diff line
		@@ -199,6 +199,8 @@ void led_classdev_resume(struct led_classdev *led_cdev);

		extern struct led_classdev of_led_get(struct device_node np, int index);
		extern void led_put(struct led_classdev *led_cdev);
		struct led_classdev __must_check devm_of_led_get(struct device dev,
		int index);

		/**
		* led_blink_set - set blinking with software fallback