192 lines
5.6 KiB
C
192 lines
5.6 KiB
C
/*
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* devfreq-event: a framework to provide raw data and events of devfreq devices
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*
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* Copyright (C) 2014 Samsung Electronics
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* Author: Chanwoo Choi <cw00.choi@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_DEVFREQ_EVENT_H__
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#define __LINUX_DEVFREQ_EVENT_H__
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#include <linux/device.h>
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/**
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* struct devfreq_event_dev - the devfreq-event device
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*
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* @node : Contain the devfreq-event device that have been registered.
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* @dev : the device registered by devfreq-event class. dev.parent is
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* the device using devfreq-event.
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* @lock : a mutex to protect accessing devfreq-event.
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* @enable_count: the number of enable function have been called.
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* @desc : the description for devfreq-event device.
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*
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* This structure contains devfreq-event device information.
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*/
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struct devfreq_event_dev {
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struct list_head node;
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struct device dev;
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struct mutex lock;
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u32 enable_count;
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const struct devfreq_event_desc *desc;
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};
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/**
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* struct devfreq_event_data - the devfreq-event data
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*
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* @load_count : load count of devfreq-event device for the given period.
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* @total_count : total count of devfreq-event device for the given period.
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* each count may represent a clock cycle, a time unit
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* (ns/us/...), or anything the device driver wants.
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* Generally, utilization is load_count / total_count.
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*
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* This structure contains the data of devfreq-event device for polling period.
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*/
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struct devfreq_event_data {
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unsigned long load_count;
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unsigned long total_count;
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};
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/**
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* struct devfreq_event_ops - the operations of devfreq-event device
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*
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* @enable : Enable the devfreq-event device.
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* @disable : Disable the devfreq-event device.
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* @reset : Reset all setting of the devfreq-event device.
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* @set_event : Set the specific event type for the devfreq-event device.
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* @get_event : Get the result of the devfreq-event devie with specific
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* event type.
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*
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* This structure contains devfreq-event device operations which can be
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* implemented by devfreq-event device drivers.
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*/
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struct devfreq_event_ops {
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/* Optional functions */
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int (*enable)(struct devfreq_event_dev *edev);
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int (*disable)(struct devfreq_event_dev *edev);
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int (*reset)(struct devfreq_event_dev *edev);
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/* Mandatory functions */
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int (*set_event)(struct devfreq_event_dev *edev);
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int (*get_event)(struct devfreq_event_dev *edev,
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struct devfreq_event_data *edata);
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};
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/**
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* struct devfreq_event_desc - the descriptor of devfreq-event device
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*
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* @name : the name of devfreq-event device.
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* @driver_data : the private data for devfreq-event driver.
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* @ops : the operation to control devfreq-event device.
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*
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* Each devfreq-event device is described with a this structure.
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* This structure contains the various data for devfreq-event device.
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*/
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struct devfreq_event_desc {
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const char *name;
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void *driver_data;
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const struct devfreq_event_ops *ops;
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};
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#if defined(CONFIG_PM_DEVFREQ_EVENT)
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extern int devfreq_event_enable_edev(struct devfreq_event_dev *edev);
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extern int devfreq_event_disable_edev(struct devfreq_event_dev *edev);
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extern bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);
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extern int devfreq_event_set_event(struct devfreq_event_dev *edev);
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extern int devfreq_event_get_event(struct devfreq_event_dev *edev,
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struct devfreq_event_data *edata);
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extern int devfreq_event_reset_event(struct devfreq_event_dev *edev);
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extern struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(
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struct device *dev, int index);
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extern int devfreq_event_get_edev_count(struct device *dev);
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extern struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
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struct devfreq_event_desc *desc);
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extern int devfreq_event_remove_edev(struct devfreq_event_dev *edev);
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extern struct devfreq_event_dev *devm_devfreq_event_add_edev(struct device *dev,
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struct devfreq_event_desc *desc);
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extern void devm_devfreq_event_remove_edev(struct device *dev,
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struct devfreq_event_dev *edev);
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static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
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{
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return edev->desc->driver_data;
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}
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#else
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static inline int devfreq_event_enable_edev(struct devfreq_event_dev *edev)
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{
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return -EINVAL;
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}
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static inline int devfreq_event_disable_edev(struct devfreq_event_dev *edev)
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{
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return -EINVAL;
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}
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static inline bool devfreq_event_is_enabled(struct devfreq_event_dev *edev)
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{
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return false;
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}
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static inline int devfreq_event_set_event(struct devfreq_event_dev *edev)
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{
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return -EINVAL;
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}
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static inline int devfreq_event_get_event(struct devfreq_event_dev *edev,
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struct devfreq_event_data *edata)
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{
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return -EINVAL;
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}
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static inline int devfreq_event_reset_event(struct devfreq_event_dev *edev)
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{
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return -EINVAL;
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}
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static inline struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(
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struct device *dev, int index)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline int devfreq_event_get_edev_count(struct device *dev)
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{
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return -EINVAL;
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}
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static inline struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
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struct devfreq_event_desc *desc)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline int devfreq_event_remove_edev(struct devfreq_event_dev *edev)
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{
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return -EINVAL;
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}
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static inline struct devfreq_event_dev *devm_devfreq_event_add_edev(
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struct device *dev,
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struct devfreq_event_desc *desc)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline void devm_devfreq_event_remove_edev(struct device *dev,
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struct devfreq_event_dev *edev)
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{
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}
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static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
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{
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return NULL;
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}
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#endif /* CONFIG_PM_DEVFREQ_EVENT */
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#endif /* __LINUX_DEVFREQ_EVENT_H__ */
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