extcon: Add resource-managed functions to register extcon notifier (58f38656) · Commits · 戴 / test

drivers/extcon/devres.c

+73 −0

Original line number	Diff line number	Diff line
		@@ -37,6 +37,19 @@ static void devm_extcon_dev_unreg(struct device dev, void res)
		extcon_dev_unregister((struct extcon_dev *)res);
		}

		struct extcon_dev_notifier_devres {
		struct extcon_dev *edev;
		unsigned int id;
		struct notifier_block *nb;
		};

		static void devm_extcon_dev_notifier_unreg(struct device dev, void res)
		{
		struct extcon_dev_notifier_devres *this = res;

		extcon_unregister_notifier(this->edev, this->id, this->nb);
		}

		/**
		* devm_extcon_dev_allocate - Allocate managed extcon device
		* @dev: device owning the extcon device being created
		@@ -141,3 +154,63 @@ void devm_extcon_dev_unregister(struct device dev, struct extcon_dev edev)
		devm_extcon_dev_match, edev));
		}
		EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);

		/**
		* devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
		* @dev: device to allocate extcon device
		* @edev: the extcon device that has the external connecotr.
		* @id: the unique id of each external connector in extcon enumeration.
		* @nb: a notifier block to be registered.
		*
		* This function manages automatically the notifier of extcon device using
		* device resource management and simplify the control of unregistering
		* the notifier of extcon device.
		*
		* Note that the second parameter given to the callback of nb (val) is
		* "old_state", not the current state. The current state can be retrieved
		* by looking at the third pameter (edev pointer)'s state value.
		*
		* Returns 0 if success or negaive error number if failure.
		*/
		int devm_extcon_register_notifier(struct device dev, struct extcon_dev edev,
		unsigned int id, struct notifier_block *nb)
		{
		struct extcon_dev_notifier_devres *ptr;
		int ret;

		ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr),
		GFP_KERNEL);
		if (!ptr)
		return -ENOMEM;

		ret = extcon_register_notifier(edev, id, nb);
		if (ret) {
		devres_free(ptr);
		return ret;
		}

		ptr->edev = edev;
		ptr->id = id;
		ptr->nb = nb;
		devres_add(dev, ptr);

		return 0;
		}
		EXPORT_SYMBOL(devm_extcon_register_notifier);

		/**
		* devm_extcon_unregister_notifier()
		- Resource-managed extcon_unregister_notifier()
		* @dev: device to allocate extcon device
		* @edev: the extcon device that has the external connecotr.
		* @id: the unique id of each external connector in extcon enumeration.
		* @nb: a notifier block to be registered.
		*/
		void devm_extcon_unregister_notifier(struct device *dev,
		struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb)
		{
		WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg,
		devm_extcon_dev_match, edev));
		}
		EXPORT_SYMBOL(devm_extcon_unregister_notifier);

include/linux/extcon.h

+17 −0

Original line number	Diff line number	Diff line
		@@ -182,6 +182,12 @@ extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb);
		extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb);
		extern int devm_extcon_register_notifier(struct device *dev,
		struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb);
		extern void devm_extcon_unregister_notifier(struct device *dev,
		struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb);

		/*
		* Following API get the extcon device from devicetree.
		@@ -273,6 +279,17 @@ static inline int extcon_unregister_notifier(struct extcon_dev *edev,
		return 0;
		}

		static inline int devm_extcon_register_notifier(struct device *dev,
		struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb)
		{
		return -ENOSYS;
		}

		static inline void devm_extcon_unregister_notifier(struct device *dev,
		struct extcon_dev *edev, unsigned int id,
		struct notifier_block *nb) { }

		static inline struct extcon_dev extcon_get_edev_by_phandle(struct device dev,
		int index)
		{

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