linux/drivers/extcon/devres.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/extcon/devres.c - EXTCON device's resource management
 *
 * Copyright (C) 2016 Samsung Electronics
 * Author: Chanwoo Choi <[email protected]>
 */

#include "extcon.h"

static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
{ … }

static void devm_extcon_dev_release(struct device *dev, void *res)
{ … }


static void devm_extcon_dev_unreg(struct device *dev, void *res)
{ … }

struct extcon_dev_notifier_devres { … };

static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res)
{ … }

static void devm_extcon_dev_notifier_all_unreg(struct device *dev, void *res)
{ … }

/**
 * devm_extcon_dev_allocate - Allocate managed extcon device
 * @dev:		the device owning the extcon device being created
 * @supported_cable:	the array of the supported external connectors
 *			ending with EXTCON_NONE.
 *
 * This function manages automatically the memory of extcon device using device
 * resource management and simplify the control of freeing the memory of extcon
 * device.
 *
 * Returns the pointer memory of allocated extcon_dev if success
 * or ERR_PTR(err) if fail
 */
struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
					const unsigned int *supported_cable)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * devm_extcon_dev_free() - Resource-managed extcon_dev_unregister()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device to be freed
 *
 * Free the memory that is allocated with devm_extcon_dev_allocate()
 * function.
 */
void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device to be registered
 *
 * this function, that extcon device is automatically unregistered on driver
 * detach. Internally this function calls extcon_dev_register() function.
 * To get more information, refer that function.
 *
 * If extcon device is registered with this function and the device needs to be
 * unregistered separately, devm_extcon_dev_unregister() should be used.
 *
 * Returns 0 if success or negaive error number if failure.
 */
int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device to unregistered
 *
 * Unregister extcon device that is registered with devm_extcon_dev_register()
 * function.
 */
void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device
 * @id:		the unique id among the 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)
{ … }
EXPORT_SYMBOL(…);

/**
 * devm_extcon_unregister_notifier()
 *			- Resource-managed extcon_unregister_notifier()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device
 * @id:		the unique id among the 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)
{ … }
EXPORT_SYMBOL(…);

/**
 * devm_extcon_register_notifier_all()
 *		- Resource-managed extcon_register_notifier_all()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device
 * @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. To get more information, refer that function.
 *
 * Returns 0 if success or negaive error number if failure.
 */
int devm_extcon_register_notifier_all(struct device *dev, struct extcon_dev *edev,
				struct notifier_block *nb)
{ … }
EXPORT_SYMBOL(…);

/**
 * devm_extcon_unregister_notifier_all()
 *		- Resource-managed extcon_unregister_notifier_all()
 * @dev:	the device owning the extcon device being created
 * @edev:	the extcon device
 * @nb:		a notifier block to be registered
 */
void devm_extcon_unregister_notifier_all(struct device *dev,
				struct extcon_dev *edev,
				struct notifier_block *nb)
{ … }
EXPORT_SYMBOL(…);