xref: /openbmc/linux/drivers/thermal/thermal_core.h (revision 7d7ae873b5e0f46d19e5dc818d1a7809e4b7cc81)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  thermal_core.h
 *
 *  Copyright (C) 2012  Intel Corp
 *  Author: Durgadoss R <durgadoss.r@intel.com>
 */

#ifndef __THERMAL_CORE_H__
#define __THERMAL_CORE_H__

#include <linux/device.h>
#include <linux/thermal.h>

#include "thermal_netlink.h"

/* Default Thermal Governor */
#if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
#define DEFAULT_THERMAL_GOVERNOR       "step_wise"
#elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
#define DEFAULT_THERMAL_GOVERNOR       "fair_share"
#elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
#define DEFAULT_THERMAL_GOVERNOR       "user_space"
#elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
#define DEFAULT_THERMAL_GOVERNOR       "power_allocator"
#elif defined(CONFIG_THERMAL_DEFAULT_GOV_BANG_BANG)
#define DEFAULT_THERMAL_GOVERNOR       "bang_bang"
#endif

/* Initial state of a cooling device during binding */
#define THERMAL_NO_TARGET -1UL

/* Init section thermal table */
extern struct thermal_governor *__governor_thermal_table[];
extern struct thermal_governor *__governor_thermal_table_end[];

#define THERMAL_TABLE_ENTRY(table, name)			\
	static typeof(name) *__thermal_table_entry_##name	\
	__used __section("__" #table "_thermal_table") = &name

#define THERMAL_GOVERNOR_DECLARE(name)	THERMAL_TABLE_ENTRY(governor, name)

#define for_each_governor_table(__governor)		\
	for (__governor = __governor_thermal_table;	\
	     __governor < __governor_thermal_table_end;	\
	     __governor++)

int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
			  void *);

int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
					      void *), void *);

int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
			      void *thermal_governor);

struct thermal_zone_device *thermal_zone_get_by_id(int id);

struct thermal_attr {
	struct device_attribute attr;
	char name[THERMAL_NAME_LENGTH];
};

static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
{
	return cdev->ops->get_requested_power && cdev->ops->state2power &&
		cdev->ops->power2state;
}

void thermal_cdev_update(struct thermal_cooling_device *);
void __thermal_cdev_update(struct thermal_cooling_device *cdev);

int get_tz_trend(struct thermal_zone_device *tz, int trip_index);

struct thermal_instance *
get_thermal_instance(struct thermal_zone_device *tz,
		     struct thermal_cooling_device *cdev,
		     int trip);

/*
 * This structure is used to describe the behavior of
 * a certain cooling device on a certain trip point
 * in a certain thermal zone
 */
struct thermal_instance {
	int id;
	char name[THERMAL_NAME_LENGTH];
	struct thermal_zone_device *tz;
	struct thermal_cooling_device *cdev;
	const struct thermal_trip *trip;
	bool initialized;
	unsigned long upper;	/* Highest cooling state for this trip point */
	unsigned long lower;	/* Lowest cooling state for this trip point */
	unsigned long target;	/* expected cooling state */
	char attr_name[THERMAL_NAME_LENGTH];
	struct device_attribute attr;
	char weight_attr_name[THERMAL_NAME_LENGTH];
	struct device_attribute weight_attr;
	struct list_head tz_node; /* node in tz->thermal_instances */
	struct list_head cdev_node; /* node in cdev->thermal_instances */
	unsigned int weight; /* The weight of the cooling device */
	bool upper_no_limit;
};

#define to_thermal_zone(_dev) \
	container_of(_dev, struct thermal_zone_device, device)

#define to_cooling_device(_dev)	\
	container_of(_dev, struct thermal_cooling_device, device)

int thermal_register_governor(struct thermal_governor *);
void thermal_unregister_governor(struct thermal_governor *);
int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
int thermal_build_list_of_policies(char *buf);
void __thermal_zone_device_update(struct thermal_zone_device *tz,
				  enum thermal_notify_event event);

/* Helpers */
void __thermal_zone_set_trips(struct thermal_zone_device *tz);
int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
			    struct thermal_trip *trip);
int thermal_zone_trip_id(struct thermal_zone_device *tz,
			 const struct thermal_trip *trip);
int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);

/* sysfs I/F */
int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev);
/* used only at binding time */
ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
ssize_t weight_show(struct device *, struct device_attribute *, char *);
ssize_t weight_store(struct device *, struct device_attribute *, const char *,
		     size_t);

#ifdef CONFIG_THERMAL_STATISTICS
void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
					 unsigned long new_state);
#else
static inline void
thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
				    unsigned long new_state) {}
#endif /* CONFIG_THERMAL_STATISTICS */

/* device tree support */
int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);

#endif /* __THERMAL_CORE_H__ */