[linux-2.6-block.git] / drivers / devfreq / governor.h

/* 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 DEVFREQ_NAME_LEN			16

#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

/*
 * Definition of the governor feature flags
 * - DEVFREQ_GOV_FLAG_IMMUTABLE
 *   : This governor is never changeable to other governors.
 * - DEVFREQ_GOV_FLAG_IRQ_DRIVEN
 *   : The devfreq won't schedule the work for this governor.
 */
#define DEVFREQ_GOV_FLAG_IMMUTABLE			BIT(0)
#define DEVFREQ_GOV_FLAG_IRQ_DRIVEN			BIT(1)

/*
 * Definition of governor attribute flags except for common sysfs attributes
 * - DEVFREQ_GOV_ATTR_POLLING_INTERVAL
 *   : Indicate polling_interval sysfs attribute
 * - DEVFREQ_GOV_ATTR_TIMER
 *   : Indicate timer sysfs attribute
 */
#define DEVFREQ_GOV_ATTR_POLLING_INTERVAL		BIT(0)
#define DEVFREQ_GOV_ATTR_TIMER				BIT(1)

/**
 * struct devfreq_governor - Devfreq policy governor
 * @node:		list node - contains registered devfreq governors
 * @name:		Governor's name
 * @attrs:		Governor's sysfs attribute flags
 * @flags:		Governor's feature flags
 * @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).
 * @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 u64 attrs;
	const u64 flags;
	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 devm_devfreq_add_governor(struct device *dev,
			      struct devfreq_governor *governor);

int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);

static inline int devfreq_update_stats(struct devfreq *df)
{
	if (!df->profile->get_dev_status)
		return -EINVAL;

	return df->profile->get_dev_status(df->dev.parent, &df->last_status);
}
#endif /* _GOVERNOR_H */
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
96ffcdf2 CC	16	#define DEVFREQ_NAME_LEN 16
96ffcdf2 CC	17
a3c98b8b MH	18	#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
a3c98b8b MH	19
7e6fdd4b RV	20	/* Devfreq events */
	21	#define DEVFREQ_GOV_START 0x1
	22	#define DEVFREQ_GOV_STOP 0x2
3a1ec2e8	23	#define DEVFREQ_GOV_UPDATE_INTERVAL 0x3
206c30cf RV	24	#define DEVFREQ_GOV_SUSPEND 0x4
206c30cf RV	25	#define DEVFREQ_GOV_RESUME 0x5
7e6fdd4b	26
6ff66e2a MK	27	#define DEVFREQ_MIN_FREQ 0
	28	#define DEVFREQ_MAX_FREQ ULONG_MAX
	29
0dd25a0d CC	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
5f1a9066 CC	40	/*
	41	* Definition of governor attribute flags except for common sysfs attributes
	42	* - DEVFREQ_GOV_ATTR_POLLING_INTERVAL
f40d8123	43	* : Indicate polling_interval sysfs attribute
5f1a9066 CC	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
3ea6b700 CC	50	/**
	51	* struct devfreq_governor - Devfreq policy governor
	52	* @node: list node - contains registered devfreq governors
	53	* @name: Governor's name
5f1a9066	54	* @attrs: Governor's sysfs attribute flags
0dd25a0d	55	* @flags: Governor's feature flags
3ea6b700 CC	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).
3ea6b700 CC	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	*/
	67	struct devfreq_governor {
	68	struct list_head node;
	69
	70	const char name[DEVFREQ_NAME_LEN];
5f1a9066	71	const u64 attrs;
0dd25a0d	72	const u64 flags;
3ea6b700 CC	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
6d743493 CC	78	void devfreq_monitor_start(struct devfreq *devfreq);
	79	void devfreq_monitor_stop(struct devfreq *devfreq);
	80	void devfreq_monitor_suspend(struct devfreq *devfreq);
	81	void devfreq_monitor_resume(struct devfreq *devfreq);
3a1ec2e8	82	void devfreq_update_interval(struct devfreq devfreq, unsigned int delay);
3aa173b8	83
6d743493 CC	84	int devfreq_add_governor(struct devfreq_governor *governor);
6d743493 CC	85	int devfreq_remove_governor(struct devfreq_governor *governor);
3aa173b8	86
1cc55204 DO	87	int devm_devfreq_add_governor(struct device *dev,
	88	struct devfreq_governor *governor);
	89
6d743493	90	int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
b4365423	91	int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
30582c25	92
f75b0afa CC	93	static inline int devfreq_update_stats(struct devfreq *df)
f75b0afa CC	94	{
b19e1346 DA	95	if (!df->profile->get_dev_status)
	96	return -EINVAL;
	97
f75b0afa CC	98	return df->profile->get_dev_status(df->dev.parent, &df->last_status);
f75b0afa CC	99	}
a3c98b8b	100	#endif /* _GOVERNOR_H */