You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
277 lines
7.9 KiB
277 lines
7.9 KiB
/*
|
|
* drivers/extcon/devres.c - EXTCON device's resource management
|
|
*
|
|
* Copyright (C) 2016 Samsung Electronics
|
|
* Author: Chanwoo Choi <cw00.choi@samsung.com>
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include "extcon.h"
|
|
|
|
static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct extcon_dev **r = res;
|
|
|
|
if (WARN_ON(!r || !*r))
|
|
return 0;
|
|
|
|
return *r == data;
|
|
}
|
|
|
|
static void devm_extcon_dev_release(struct device *dev, void *res)
|
|
{
|
|
extcon_dev_free(*(struct extcon_dev **)res);
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
static void devm_extcon_dev_notifier_all_unreg(struct device *dev, void *res)
|
|
{
|
|
struct extcon_dev_notifier_devres *this = res;
|
|
|
|
extcon_unregister_notifier_all(this->edev, this->nb);
|
|
}
|
|
|
|
/**
|
|
* devm_extcon_dev_allocate - Allocate managed extcon device
|
|
* @dev: device owning the extcon device being created
|
|
* @supported_cable: Array of supported extcon ending with EXTCON_NONE.
|
|
* If supported_cable is NULL, cable name related APIs
|
|
* are disabled.
|
|
*
|
|
* 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)
|
|
{
|
|
struct extcon_dev **ptr, *edev;
|
|
|
|
ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
edev = extcon_dev_allocate(supported_cable);
|
|
if (IS_ERR(edev)) {
|
|
devres_free(ptr);
|
|
return edev;
|
|
}
|
|
|
|
edev->dev.parent = dev;
|
|
|
|
*ptr = edev;
|
|
devres_add(dev, ptr);
|
|
|
|
return edev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
|
|
|
|
/**
|
|
* devm_extcon_dev_free() - Resource-managed extcon_dev_unregister()
|
|
* @dev: device the extcon belongs to
|
|
* @edev: the extcon device to unregister
|
|
*
|
|
* Free the memory that is allocated with devm_extcon_dev_allocate()
|
|
* function.
|
|
*/
|
|
void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_extcon_dev_release,
|
|
devm_extcon_dev_match, edev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
|
|
|
|
/**
|
|
* devm_extcon_dev_register() - Resource-managed extcon_dev_register()
|
|
* @dev: device to allocate extcon device
|
|
* @edev: the new extcon device to register
|
|
*
|
|
* Managed extcon_dev_register() function. If extcon device is attached with
|
|
* 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)
|
|
{
|
|
struct extcon_dev **ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = extcon_dev_register(edev);
|
|
if (ret) {
|
|
devres_free(ptr);
|
|
return ret;
|
|
}
|
|
|
|
*ptr = edev;
|
|
devres_add(dev, ptr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
|
|
|
|
/**
|
|
* devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
|
|
* @dev: device the extcon belongs to
|
|
* @edev: the extcon device to unregister
|
|
*
|
|
* Unregister extcon device that is registered with devm_extcon_dev_register()
|
|
* function.
|
|
*/
|
|
void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
|
|
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);
|
|
|
|
/**
|
|
* devm_extcon_register_notifier_all()
|
|
* - Resource-managed extcon_register_notifier_all()
|
|
* @dev: device to allocate extcon device
|
|
* @edev: the extcon device that has the external connecotr.
|
|
* @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)
|
|
{
|
|
struct extcon_dev_notifier_devres *ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_extcon_dev_notifier_all_unreg, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = extcon_register_notifier_all(edev, nb);
|
|
if (ret) {
|
|
devres_free(ptr);
|
|
return ret;
|
|
}
|
|
|
|
ptr->edev = edev;
|
|
ptr->nb = nb;
|
|
devres_add(dev, ptr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devm_extcon_register_notifier_all);
|
|
|
|
/**
|
|
* devm_extcon_unregister_notifier_all()
|
|
* - Resource-managed extcon_unregister_notifier_all()
|
|
* @dev: device to allocate extcon device
|
|
* @edev: the extcon device that has the external connecotr.
|
|
* @nb: a notifier block to be registered.
|
|
*/
|
|
void devm_extcon_unregister_notifier_all(struct device *dev,
|
|
struct extcon_dev *edev,
|
|
struct notifier_block *nb)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_extcon_dev_notifier_all_unreg,
|
|
devm_extcon_dev_match, edev));
|
|
}
|
|
EXPORT_SYMBOL(devm_extcon_unregister_notifier_all);
|
|
|