projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| a3c98b8b MH |
2 | /* |
| 3 | * governor.h - internal header for devfreq governors. | |
| 4 | * | |
| 5 | * Copyright (C) 2011 Samsung Electronics | |
| 6 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
| 7 | * | |
| a3c98b8b MH |
8 | * This header is for devfreq governors in drivers/devfreq/ |
| 9 | */ | |
| 10 | ||
| 11 | #ifndef _GOVERNOR_H | |
| 12 | #define _GOVERNOR_H | |
| 13 | ||
| 14 | #include <linux/devfreq.h> | |
| 15 | ||
| 16 | #define to_devfreq(DEV) container_of((DEV), struct devfreq, dev) | |
| 17 | ||
| 7e6fdd4b RV |
18 | /* Devfreq events */ |
| 19 | #define DEVFREQ_GOV_START 0x1 | |
| 20 | #define DEVFREQ_GOV_STOP 0x2 | |
| 21 | #define DEVFREQ_GOV_INTERVAL 0x3 | |
| 206c30cf RV |
22 | #define DEVFREQ_GOV_SUSPEND 0x4 |
| 23 | #define DEVFREQ_GOV_RESUME 0x5 | |
| 7e6fdd4b | 24 | |
| 6ff66e2a MK |
25 | #define DEVFREQ_MIN_FREQ 0 |
| 26 | #define DEVFREQ_MAX_FREQ ULONG_MAX | |
| 27 | ||
| 3ea6b700 CC |
28 | /** |
| 29 | * struct devfreq_governor - Devfreq policy governor | |
| 30 | * @node: list node - contains registered devfreq governors | |
| 31 | * @name: Governor's name | |
| 32 | * @immutable: Immutable flag for governor. If the value is 1, | |
| 33 | * this govenror is never changeable to other governor. | |
| 34 | * @get_target_freq: Returns desired operating frequency for the device. | |
| 35 | * Basically, get_target_freq will run | |
| 36 | * devfreq_dev_profile.get_dev_status() to get the | |
| 37 | * status of the device (load = busy_time / total_time). | |
| 38 | * If no_central_polling is set, this callback is called | |
| 39 | * only with update_devfreq() notified by OPP. | |
| 40 | * @event_handler: Callback for devfreq core framework to notify events | |
| 41 | * to governors. Events include per device governor | |
| 42 | * init and exit, opp changes out of devfreq, suspend | |
| 43 | * and resume of per device devfreq during device idle. | |
| 44 | * | |
| 45 | * Note that the callbacks are called with devfreq->lock locked by devfreq. | |
| 46 | */ | |
| 47 | struct devfreq_governor { | |
| 48 | struct list_head node; | |
| 49 | ||
| 50 | const char name[DEVFREQ_NAME_LEN]; | |
| 51 | const unsigned int immutable; | |
| 52 | int (*get_target_freq)(struct devfreq *this, unsigned long *freq); | |
| 53 | int (*event_handler)(struct devfreq *devfreq, | |
| 54 | unsigned int event, void *data); | |
| 55 | }; | |
| 56 | ||
| 7e6fdd4b RV |
57 | extern void devfreq_monitor_start(struct devfreq *devfreq); |
| 58 | extern void devfreq_monitor_stop(struct devfreq *devfreq); | |
| 59 | extern void devfreq_monitor_suspend(struct devfreq *devfreq); | |
| 60 | extern void devfreq_monitor_resume(struct devfreq *devfreq); | |
| 61 | extern void devfreq_interval_update(struct devfreq *devfreq, | |
| 62 | unsigned int *delay); | |
| 3aa173b8 NM |
63 | |
| 64 | extern int devfreq_add_governor(struct devfreq_governor *governor); | |
| 65 | extern int devfreq_remove_governor(struct devfreq_governor *governor); | |
| 66 | ||
| 30582c25 CC |
67 | extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq); |
| 68 | ||
| f75b0afa CC |
69 | static inline int devfreq_update_stats(struct devfreq *df) |
| 70 | { | |
| 71 | return df->profile->get_dev_status(df->dev.parent, &df->last_status); | |
| 72 | } | |
| a3c98b8b | 73 | #endif /* _GOVERNOR_H */ |