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96 lines
3.2 KiB
96 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* governor.h - internal header for devfreq governors. |
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* |
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* Copyright (C) 2011 Samsung Electronics |
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* MyungJoo Ham <[email protected]> |
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* |
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* This header is for devfreq governors in drivers/devfreq/ |
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*/ |
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#ifndef _GOVERNOR_H |
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#define _GOVERNOR_H |
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#include <linux/devfreq.h> |
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#define DEVFREQ_NAME_LEN 16 |
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#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev) |
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/* Devfreq events */ |
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#define DEVFREQ_GOV_START 0x1 |
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#define DEVFREQ_GOV_STOP 0x2 |
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#define DEVFREQ_GOV_UPDATE_INTERVAL 0x3 |
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#define DEVFREQ_GOV_SUSPEND 0x4 |
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#define DEVFREQ_GOV_RESUME 0x5 |
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#define DEVFREQ_MIN_FREQ 0 |
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#define DEVFREQ_MAX_FREQ ULONG_MAX |
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/* |
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* Definition of the governor feature flags |
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* - DEVFREQ_GOV_FLAG_IMMUTABLE |
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* : This governor is never changeable to other governors. |
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* - DEVFREQ_GOV_FLAG_IRQ_DRIVEN |
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* : The devfreq won't schedule the work for this governor. |
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*/ |
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#define DEVFREQ_GOV_FLAG_IMMUTABLE BIT(0) |
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#define DEVFREQ_GOV_FLAG_IRQ_DRIVEN BIT(1) |
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/* |
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* Definition of governor attribute flags except for common sysfs attributes |
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* - DEVFREQ_GOV_ATTR_POLLING_INTERVAL |
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* : Indicate polling_interval sysfs attribute |
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* - DEVFREQ_GOV_ATTR_TIMER |
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* : Indicate timer sysfs attribute |
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*/ |
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#define DEVFREQ_GOV_ATTR_POLLING_INTERVAL BIT(0) |
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#define DEVFREQ_GOV_ATTR_TIMER BIT(1) |
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/** |
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* struct devfreq_governor - Devfreq policy governor |
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* @node: list node - contains registered devfreq governors |
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* @name: Governor's name |
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* @attrs: Governor's sysfs attribute flags |
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* @flags: Governor's feature flags |
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* @get_target_freq: Returns desired operating frequency for the device. |
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* Basically, get_target_freq will run |
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* devfreq_dev_profile.get_dev_status() to get the |
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* status of the device (load = busy_time / total_time). |
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* If no_central_polling is set, this callback is called |
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* only with update_devfreq() notified by OPP. |
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* @event_handler: Callback for devfreq core framework to notify events |
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* to governors. Events include per device governor |
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* init and exit, opp changes out of devfreq, suspend |
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* and resume of per device devfreq during device idle. |
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* |
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* Note that the callbacks are called with devfreq->lock locked by devfreq. |
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*/ |
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struct devfreq_governor { |
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struct list_head node; |
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const char name[DEVFREQ_NAME_LEN]; |
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const u64 attrs; |
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const u64 flags; |
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int (*get_target_freq)(struct devfreq *this, unsigned long *freq); |
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int (*event_handler)(struct devfreq *devfreq, |
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unsigned int event, void *data); |
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}; |
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void devfreq_monitor_start(struct devfreq *devfreq); |
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void devfreq_monitor_stop(struct devfreq *devfreq); |
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void devfreq_monitor_suspend(struct devfreq *devfreq); |
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void devfreq_monitor_resume(struct devfreq *devfreq); |
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void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay); |
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int devfreq_add_governor(struct devfreq_governor *governor); |
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int devfreq_remove_governor(struct devfreq_governor *governor); |
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int devfreq_update_status(struct devfreq *devfreq, unsigned long freq); |
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int devfreq_update_target(struct devfreq *devfreq, unsigned long freq); |
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static inline int devfreq_update_stats(struct devfreq *df) |
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{ |
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return df->profile->get_dev_status(df->dev.parent, &df->last_status); |
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} |
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#endif /* _GOVERNOR_H */
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