/* * 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 #define DEVFREQ_MIN_FREQ 0 #define DEVFREQ_MAX_FREQ ULONG_MAX /** * 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); }; 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 */