217 lines
6.1 KiB
C
217 lines
6.1 KiB
C
/*
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* drivers/extcon/devres.c - EXTCON device's resource management
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*
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* Copyright (C) 2016 Samsung Electronics
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* Author: Chanwoo Choi <cw00.choi@samsung.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "extcon.h"
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static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
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{
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struct extcon_dev **r = res;
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if (WARN_ON(!r || !*r))
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return 0;
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return *r == data;
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}
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static void devm_extcon_dev_release(struct device *dev, void *res)
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{
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extcon_dev_free(*(struct extcon_dev **)res);
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}
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static void devm_extcon_dev_unreg(struct device *dev, void *res)
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{
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extcon_dev_unregister(*(struct extcon_dev **)res);
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}
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struct extcon_dev_notifier_devres {
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struct extcon_dev *edev;
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unsigned int id;
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struct notifier_block *nb;
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};
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static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res)
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{
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struct extcon_dev_notifier_devres *this = res;
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extcon_unregister_notifier(this->edev, this->id, this->nb);
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}
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/**
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* devm_extcon_dev_allocate - Allocate managed extcon device
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* @dev: device owning the extcon device being created
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* @supported_cable: Array of supported extcon ending with EXTCON_NONE.
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* If supported_cable is NULL, cable name related APIs
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* are disabled.
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*
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* This function manages automatically the memory of extcon device using device
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* resource management and simplify the control of freeing the memory of extcon
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* device.
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*
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* Returns the pointer memory of allocated extcon_dev if success
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* or ERR_PTR(err) if fail
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*/
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struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
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const unsigned int *supported_cable)
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{
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struct extcon_dev **ptr, *edev;
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ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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edev = extcon_dev_allocate(supported_cable);
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if (IS_ERR(edev)) {
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devres_free(ptr);
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return edev;
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}
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edev->dev.parent = dev;
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*ptr = edev;
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devres_add(dev, ptr);
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return edev;
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}
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EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
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/**
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* devm_extcon_dev_free() - Resource-managed extcon_dev_unregister()
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* @dev: device the extcon belongs to
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* @edev: the extcon device to unregister
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*
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* Free the memory that is allocated with devm_extcon_dev_allocate()
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* function.
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*/
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void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
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{
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WARN_ON(devres_release(dev, devm_extcon_dev_release,
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devm_extcon_dev_match, edev));
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}
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EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
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/**
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* devm_extcon_dev_register() - Resource-managed extcon_dev_register()
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* @dev: device to allocate extcon device
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* @edev: the new extcon device to register
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*
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* Managed extcon_dev_register() function. If extcon device is attached with
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* this function, that extcon device is automatically unregistered on driver
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* detach. Internally this function calls extcon_dev_register() function.
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* To get more information, refer that function.
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*
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* If extcon device is registered with this function and the device needs to be
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* unregistered separately, devm_extcon_dev_unregister() should be used.
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*
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* Returns 0 if success or negaive error number if failure.
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*/
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int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
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{
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struct extcon_dev **ptr;
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int ret;
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ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return -ENOMEM;
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ret = extcon_dev_register(edev);
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if (ret) {
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devres_free(ptr);
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return ret;
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}
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*ptr = edev;
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devres_add(dev, ptr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
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/**
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* devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
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* @dev: device the extcon belongs to
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* @edev: the extcon device to unregister
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*
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* Unregister extcon device that is registered with devm_extcon_dev_register()
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* function.
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*/
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void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
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{
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WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
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devm_extcon_dev_match, edev));
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}
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EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
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/**
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* devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
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* @dev: device to allocate extcon device
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* @edev: the extcon device that has the external connecotr.
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* @id: the unique id of each external connector in extcon enumeration.
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* @nb: a notifier block to be registered.
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*
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* This function manages automatically the notifier of extcon device using
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* device resource management and simplify the control of unregistering
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* the notifier of extcon device.
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*
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* Note that the second parameter given to the callback of nb (val) is
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* "old_state", not the current state. The current state can be retrieved
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* by looking at the third pameter (edev pointer)'s state value.
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*
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* Returns 0 if success or negaive error number if failure.
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*/
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int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev,
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unsigned int id, struct notifier_block *nb)
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{
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struct extcon_dev_notifier_devres *ptr;
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int ret;
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ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr),
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GFP_KERNEL);
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if (!ptr)
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return -ENOMEM;
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ret = extcon_register_notifier(edev, id, nb);
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if (ret) {
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devres_free(ptr);
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return ret;
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}
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ptr->edev = edev;
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ptr->id = id;
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ptr->nb = nb;
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devres_add(dev, ptr);
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return 0;
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}
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EXPORT_SYMBOL(devm_extcon_register_notifier);
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/**
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* devm_extcon_unregister_notifier()
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- Resource-managed extcon_unregister_notifier()
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* @dev: device to allocate extcon device
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* @edev: the extcon device that has the external connecotr.
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* @id: the unique id of each external connector in extcon enumeration.
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* @nb: a notifier block to be registered.
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*/
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void devm_extcon_unregister_notifier(struct device *dev,
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struct extcon_dev *edev, unsigned int id,
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struct notifier_block *nb)
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{
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WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg,
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devm_extcon_dev_match, edev));
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}
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EXPORT_SYMBOL(devm_extcon_unregister_notifier);
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