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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * governor.h - internal header for devfreq governors.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 *
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
18/* Devfreq events */
19#define DEVFREQ_GOV_START 0x1
20#define DEVFREQ_GOV_STOP 0x2
21#define DEVFREQ_GOV_INTERVAL 0x3
22#define DEVFREQ_GOV_SUSPEND 0x4
23#define DEVFREQ_GOV_RESUME 0x5
24
25#define DEVFREQ_MIN_FREQ 0
26#define DEVFREQ_MAX_FREQ ULONG_MAX
27
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 */
47struct 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
57extern void devfreq_monitor_start(struct devfreq *devfreq);
58extern void devfreq_monitor_stop(struct devfreq *devfreq);
59extern void devfreq_monitor_suspend(struct devfreq *devfreq);
60extern void devfreq_monitor_resume(struct devfreq *devfreq);
61extern void devfreq_interval_update(struct devfreq *devfreq,
62 unsigned int *delay);
63
64extern int devfreq_add_governor(struct devfreq_governor *governor);
65extern int devfreq_remove_governor(struct devfreq_governor *governor);
66
67extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
68
69static inline int devfreq_update_stats(struct devfreq *df)
70{
71 return df->profile->get_dev_status(df->dev.parent, &df->last_status);
72}
73#endif /* _GOVERNOR_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * governor.h - internal header for devfreq governors.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 *
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 DEVFREQ_NAME_LEN 16
17
18#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
19
20/* Devfreq events */
21#define DEVFREQ_GOV_START 0x1
22#define DEVFREQ_GOV_STOP 0x2
23#define DEVFREQ_GOV_UPDATE_INTERVAL 0x3
24#define DEVFREQ_GOV_SUSPEND 0x4
25#define DEVFREQ_GOV_RESUME 0x5
26
27#define DEVFREQ_MIN_FREQ 0
28#define DEVFREQ_MAX_FREQ ULONG_MAX
29
30/*
31 * Definition of the governor feature flags
32 * - DEVFREQ_GOV_FLAG_IMMUTABLE
33 * : This governor is never changeable to other governors.
34 * - DEVFREQ_GOV_FLAG_IRQ_DRIVEN
35 * : The devfreq won't schedule the work for this governor.
36 */
37#define DEVFREQ_GOV_FLAG_IMMUTABLE BIT(0)
38#define DEVFREQ_GOV_FLAG_IRQ_DRIVEN BIT(1)
39
40/*
41 * Definition of governor attribute flags except for common sysfs attributes
42 * - DEVFREQ_GOV_ATTR_POLLING_INTERVAL
43 * : Indicate polling_interval sysfs attribute
44 * - DEVFREQ_GOV_ATTR_TIMER
45 * : Indicate timer sysfs attribute
46 */
47#define DEVFREQ_GOV_ATTR_POLLING_INTERVAL BIT(0)
48#define DEVFREQ_GOV_ATTR_TIMER BIT(1)
49
50/**
51 * struct devfreq_governor - Devfreq policy governor
52 * @node: list node - contains registered devfreq governors
53 * @name: Governor's name
54 * @attrs: Governor's sysfs attribute flags
55 * @flags: Governor's feature flags
56 * @get_target_freq: Returns desired operating frequency for the device.
57 * Basically, get_target_freq will run
58 * devfreq_dev_profile.get_dev_status() to get the
59 * status of the device (load = busy_time / total_time).
60 * @event_handler: Callback for devfreq core framework to notify events
61 * to governors. Events include per device governor
62 * init and exit, opp changes out of devfreq, suspend
63 * and resume of per device devfreq during device idle.
64 *
65 * Note that the callbacks are called with devfreq->lock locked by devfreq.
66 */
67struct devfreq_governor {
68 struct list_head node;
69
70 const char name[DEVFREQ_NAME_LEN];
71 const u64 attrs;
72 const u64 flags;
73 int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
74 int (*event_handler)(struct devfreq *devfreq,
75 unsigned int event, void *data);
76};
77
78void devfreq_monitor_start(struct devfreq *devfreq);
79void devfreq_monitor_stop(struct devfreq *devfreq);
80void devfreq_monitor_suspend(struct devfreq *devfreq);
81void devfreq_monitor_resume(struct devfreq *devfreq);
82void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay);
83
84int devfreq_add_governor(struct devfreq_governor *governor);
85int devfreq_remove_governor(struct devfreq_governor *governor);
86
87int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
88int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
89
90static inline int devfreq_update_stats(struct devfreq *df)
91{
92 if (!df->profile->get_dev_status)
93 return -EINVAL;
94
95 return df->profile->get_dev_status(df->dev.parent, &df->last_status);
96}
97#endif /* _GOVERNOR_H */