| /* |
| * 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 */ |