| /* | |
| * 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); | |
| static inline int devfreq_update_stats(struct devfreq *df) | |
| { | |
| return df->profile->get_dev_status(df->dev.parent, &df->last_status); | |
| } | |
| #endif /* _GOVERNOR_H */ |