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component: Add common helper for compare/release functions

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The component requires the compare/release functions, there are so many
copies in current kernel. Just define four common helpers for them.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Link: https://lore.kernel.org/r/20220214060819.7334-2-yong.wu@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yong Wu 2022-02-14 14:07:57 +08:00 committed by Greg Kroah-Hartman
parent 36744c117a
commit 2502960fba
2 changed files with 64 additions and 0 deletions
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58
drivers/base/component.c
View File

@ -6,6 +6,7 @@
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
@ -283,6 +284,63 @@ static void take_down_aggregate_device(struct aggregate_device *adev)
}
}
/**
* component_compare_of - A common component compare function for of_node
* @dev: component device
* @data: @compare_data from component_match_add_release()
*
* A common compare function when compare_data is device of_node. e.g.
* component_match_add_release(masterdev, &match, component_release_of,
* component_compare_of, component_dev_of_node)
*/
int component_compare_of(struct device *dev, void *data)
{
return device_match_of_node(dev, data);
}
EXPORT_SYMBOL_GPL(component_compare_of);
/**
* component_release_of - A common component release function for of_node
* @dev: component device
* @data: @compare_data from component_match_add_release()
*
* About the example, Please see component_compare_of().
*/
void component_release_of(struct device *dev, void *data)
{
of_node_put(data);
}
EXPORT_SYMBOL_GPL(component_release_of);
/**
* component_compare_dev - A common component compare function for dev
* @dev: component device
* @data: @compare_data from component_match_add_release()
*
* A common compare function when compare_data is struce device. e.g.
* component_match_add(masterdev, &match, component_compare_dev, component_dev)
*/
int component_compare_dev(struct device *dev, void *data)
{
return dev == data;
}
EXPORT_SYMBOL_GPL(component_compare_dev);
/**
* component_compare_dev_name - A common component compare function for device name
* @dev: component device
* @data: @compare_data from component_match_add_release()
*
* A common compare function when compare_data is device name string. e.g.
* component_match_add(masterdev, &match, component_compare_dev_name,
* "component_dev_name")
*/
int component_compare_dev_name(struct device *dev, void *data)
{
return device_match_name(dev, data);
}
EXPORT_SYMBOL_GPL(component_compare_dev_name);
static void devm_component_match_release(struct device *parent, void *res)
{
struct component_match *match = res;

6
include/linux/component.h
View File

@ -82,6 +82,12 @@ struct component_master_ops {
void (*unbind)(struct device *master);
};
/* A set helper functions for component compare/release */
int component_compare_of(struct device *dev, void *data);
void component_release_of(struct device *dev, void *data);
int component_compare_dev(struct device *dev, void *data);
int component_compare_dev_name(struct device *dev, void *data);
void component_master_del(struct device *,
const struct component_master_ops *);