/*
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* governor.h - internal header for devfreq governors.
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*
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@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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* This header is for devfreq governors in drivers/devfreq/
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*/
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#ifndef _GOVERNOR_H
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#define _GOVERNOR_H
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#include <linux/devfreq.h>
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#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
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/* Devfreq events */
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#define DEVFREQ_GOV_START 0x1
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#define DEVFREQ_GOV_STOP 0x2
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#define DEVFREQ_GOV_INTERVAL 0x3
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#define DEVFREQ_GOV_SUSPEND 0x4
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#define DEVFREQ_GOV_RESUME 0x5
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#define DEVFREQ_MIN_FREQ 0
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#define DEVFREQ_MAX_FREQ ULONG_MAX
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/**
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* struct devfreq_governor - Devfreq policy governor
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* @node: list node - contains registered devfreq governors
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* @name: Governor's name
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* @immutable: Immutable flag for governor. If the value is 1,
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* this govenror is never changeable to other governor.
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* @get_target_freq: Returns desired operating frequency for the device.
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* Basically, get_target_freq will run
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* devfreq_dev_profile.get_dev_status() to get the
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* status of the device (load = busy_time / total_time).
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* If no_central_polling is set, this callback is called
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* only with update_devfreq() notified by OPP.
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* @event_handler: Callback for devfreq core framework to notify events
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* to governors. Events include per device governor
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* init and exit, opp changes out of devfreq, suspend
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* and resume of per device devfreq during device idle.
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*
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* Note that the callbacks are called with devfreq->lock locked by devfreq.
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*/
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struct devfreq_governor {
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struct list_head node;
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const char name[DEVFREQ_NAME_LEN];
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const unsigned int immutable;
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int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
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int (*event_handler)(struct devfreq *devfreq,
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unsigned int event, void *data);
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};
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/* Caution: devfreq->lock must be locked before calling update_devfreq */
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extern int update_devfreq(struct devfreq *devfreq);
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extern void devfreq_monitor_start(struct devfreq *devfreq);
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extern void devfreq_monitor_stop(struct devfreq *devfreq);
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extern void devfreq_monitor_suspend(struct devfreq *devfreq);
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extern void devfreq_monitor_resume(struct devfreq *devfreq);
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extern void devfreq_interval_update(struct devfreq *devfreq,
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unsigned int *delay);
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extern int devfreq_add_governor(struct devfreq_governor *governor);
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extern int devfreq_remove_governor(struct devfreq_governor *governor);
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extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
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static inline int devfreq_update_stats(struct devfreq *df)
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{
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return df->profile->get_dev_status(df->dev.parent, &df->last_status);
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}
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#endif /* _GOVERNOR_H */
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