73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*
|
|
* governor.h - internal header for devfreq governors.
|
|
*
|
|
* Copyright (C) 2011 Samsung Electronics
|
|
* MyungJoo Ham <myungjoo.ham@samsung.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This header is for devfreq governors in drivers/devfreq/
|
|
*/
|
|
|
|
#ifndef _GOVERNOR_H
|
|
#define _GOVERNOR_H
|
|
|
|
#include <linux/devfreq.h>
|
|
|
|
#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
|
|
|
|
/* Devfreq events */
|
|
#define DEVFREQ_GOV_START 0x1
|
|
#define DEVFREQ_GOV_STOP 0x2
|
|
#define DEVFREQ_GOV_INTERVAL 0x3
|
|
#define DEVFREQ_GOV_SUSPEND 0x4
|
|
#define DEVFREQ_GOV_RESUME 0x5
|
|
|
|
/**
|
|
* struct devfreq_governor - Devfreq policy governor
|
|
* @node: list node - contains registered devfreq governors
|
|
* @name: Governor's name
|
|
* @immutable: Immutable flag for governor. If the value is 1,
|
|
* this govenror is never changeable to other governor.
|
|
* @get_target_freq: Returns desired operating frequency for the device.
|
|
* Basically, get_target_freq will run
|
|
* devfreq_dev_profile.get_dev_status() to get the
|
|
* status of the device (load = busy_time / total_time).
|
|
* If no_central_polling is set, this callback is called
|
|
* only with update_devfreq() notified by OPP.
|
|
* @event_handler: Callback for devfreq core framework to notify events
|
|
* to governors. Events include per device governor
|
|
* init and exit, opp changes out of devfreq, suspend
|
|
* and resume of per device devfreq during device idle.
|
|
*
|
|
* Note that the callbacks are called with devfreq->lock locked by devfreq.
|
|
*/
|
|
struct devfreq_governor {
|
|
struct list_head node;
|
|
|
|
const char name[DEVFREQ_NAME_LEN];
|
|
const unsigned int immutable;
|
|
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
|
|
int (*event_handler)(struct devfreq *devfreq,
|
|
unsigned int event, void *data);
|
|
};
|
|
|
|
/* Caution: devfreq->lock must be locked before calling update_devfreq */
|
|
extern int update_devfreq(struct devfreq *devfreq);
|
|
|
|
extern void devfreq_monitor_start(struct devfreq *devfreq);
|
|
extern void devfreq_monitor_stop(struct devfreq *devfreq);
|
|
extern void devfreq_monitor_suspend(struct devfreq *devfreq);
|
|
extern void devfreq_monitor_resume(struct devfreq *devfreq);
|
|
extern void devfreq_interval_update(struct devfreq *devfreq,
|
|
unsigned int *delay);
|
|
|
|
extern int devfreq_add_governor(struct devfreq_governor *governor);
|
|
extern int devfreq_remove_governor(struct devfreq_governor *governor);
|
|
|
|
extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
|
|
|
|
#endif /* _GOVERNOR_H */
|