Commit 2539f319 authored by Xiangwei Li's avatar Xiangwei Li Committed by Ma Wupeng
Browse files

PM / devfreq: event: Add devfreq_event_get_edev_by_dev function 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBC4SJ



--------------------------------

When there is no devicetree association between devfreq device and
devfreq-events device, devfreq_event_dev cannot be obtained through the
devfreq_event_get_edev_by_phandle function.

Therefore, a new interface is added to obtain struct devfreq_event_dev
through the specified device.

Signed-off-by: default avatarXiangwei Li <liwei728@huawei.com>
parent 3ff0de83

drivers/devfreq/devfreq-event.c

+32 −0
Original line number Diff line number Diff line
@@ -256,6 +256,38 @@ struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(struct device *dev, 
}

EXPORT_SYMBOL_GPL(devfreq_event_get_edev_by_phandle);



/**

 * devfreq_event_get_edev_by_dev() - Get the devfreq-event dev from

 *					 specified device.

 * @dev		: the pointer to the given device

 *

 * Note that this function return the pointer of devfreq-event device.

 */

struct devfreq_event_dev *devfreq_event_get_edev_by_dev(struct device *dev)

{

	struct devfreq_event_dev *edev;



	if (!dev)

		return ERR_PTR(-EINVAL);



	mutex_lock(&devfreq_event_list_lock);

	list_for_each_entry(edev, &devfreq_event_list, node) {

		if (edev->dev.parent == dev)

			goto out;

	}



	edev = NULL;

out:

	mutex_unlock(&devfreq_event_list_lock);



	if (!edev) {

		return ERR_PTR(-ENODEV);

	}



	return edev;

}

EXPORT_SYMBOL_GPL(devfreq_event_get_edev_by_dev);



/**

 * devfreq_event_get_edev_count() - Get the count of devfreq-event dev

 * @dev		: the pointer to the given device

include/linux/devfreq-event.h

+8 −0
Original line number Diff line number Diff line
@@ -109,6 +109,8 @@ extern struct devfreq_event_dev *devfreq_event_get_edev_by_phandle( 
				struct device *dev,

				const char *phandle_name,

				int index);

extern struct devfreq_event_dev *devfreq_event_get_edev_by_dev(

				struct device *dev);

extern int devfreq_event_get_edev_count(struct device *dev,

				const char *phandle_name);

extern struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
@@ -162,6 +164,12 @@ static inline struct devfreq_event_dev *devfreq_event_get_edev_by_phandle( 
	return ERR_PTR(-EINVAL);

}



static inline struct devfreq_event_dev *devfreq_event_get_edev_by_dev(

					struct device *dev)

{

	return ERR_PTR(-EINVAL);

}



static inline int devfreq_event_get_edev_count(struct device *dev,

					const char *phandle_name)

{