Release 4.12 drivers/devfreq/governor.h

/*
 * 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 */
Overall Contributors
Person
Tokens
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CommitProp
Rajagopal Venkat
76
38.00%
2
33.33%
Chanwoo Choi
73
36.50%
2
33.33%
MyungJoo Ham
31
15.50%
1
16.67%
Nishanth Menon
20
10.00%
1
16.67%
Total
200
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6
100.00%
Directory: drivers/devfreq

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