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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * governor.h - internal header for devfreq governors.
- *
- * Copyright (C) 2011 Samsung Electronics
- * MyungJoo Ham <myungjoo.ham@samsung.com>
- *
- * 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_UPDATE_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 governor is never changeable to other governor.
- * @interrupt_driven: Devfreq core won't schedule polling work for this
- * governor if value is set to 1.
- * @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;
- const unsigned int interrupt_driven;
- int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
- int (*event_handler)(struct devfreq *devfreq,
- unsigned int event, void *data);
- };
- void devfreq_monitor_start(struct devfreq *devfreq);
- void devfreq_monitor_stop(struct devfreq *devfreq);
- void devfreq_monitor_suspend(struct devfreq *devfreq);
- void devfreq_monitor_resume(struct devfreq *devfreq);
- void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay);
- int devfreq_add_governor(struct devfreq_governor *governor);
- int devfreq_remove_governor(struct devfreq_governor *governor);
- 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 */
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