/* SPDX-License-Identifier: GPL-2.0 */
/*
* thermal . h ( $ Revision : 0 $ )
*
* Copyright ( C ) 2008 Intel Corp
* Copyright ( C ) 2008 Zhang Rui < rui . zhang @ intel . com >
* Copyright ( C ) 2008 Sujith Thomas < sujith . thomas @ intel . com >
*/
#ifndef __THERMAL_H__
#define __THERMAL_H__
#include <linux/of.h>
#include <linux/idr.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/workqueue.h>
#include <uapi/linux/thermal.h>
/* invalid cooling state */
#define THERMAL_CSTATE_INVALID -1 UL
/* No upper/lower limit requirement */
#define THERMAL_NO_LIMIT ((u32)~0 )
/* Default weight of a bound cooling device */
#define THERMAL_WEIGHT_DEFAULT 0
/* use value, which < 0K, to indicate an invalid/uninitialized temperature */
#define THERMAL_TEMP_INVALID -274000
struct thermal_zone_device;
struct thermal_cooling_device;
struct thermal_instance;
struct thermal_debugfs;
struct thermal_attr;
enum thermal_trend {
THERMAL_TREND_STABLE, /* temperature is stable */
THERMAL_TREND_RAISING, /* temperature is raising */
THERMAL_TREND_DROPPING, /* temperature is dropping */
};
/* Thermal notification reason */
enum thermal_notify_event {
THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
THERMAL_DEVICE_DOWN, /* Thermal device is down */
THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
THERMAL_EVENT_KEEP_ALIVE, /* Request for user space handler to respond */
THERMAL_TZ_BIND_CDEV, /* Cooling dev is bind to the thermal zone */
THERMAL_TZ_UNBIND_CDEV, /* Cooling dev is unbind from the thermal zone */
THERMAL_INSTANCE_WEIGHT_CHANGED, /* Thermal instance weight changed */
THERMAL_TZ_RESUME, /* Thermal zone is resuming after system sleep */
THERMAL_TZ_ADD_THRESHOLD, /* Threshold added */
THERMAL_TZ_DEL_THRESHOLD, /* Threshold deleted */
THERMAL_TZ_FLUSH_THRESHOLDS, /* All thresholds deleted */
};
/**
* struct thermal_trip - representation of a point in temperature domain
* @ temperature : temperature value in miliCelsius
* @ hysteresis : relative hysteresis in miliCelsius
* @ type : trip point type
* @ priv : pointer to driver data associated with this trip
* @ flags : flags representing binary properties of the trip
*/
struct thermal_trip {
int temperature;
int hysteresis;
enum thermal_trip_type type;
u8 flags;
void *priv;
};
#define THERMAL_TRIP_FLAG_RW_TEMP BIT(0 )
#define THERMAL_TRIP_FLAG_RW_HYST BIT(1 )
#define THERMAL_TRIP_FLAG_RW (THERMAL_TRIP_FLAG_RW_TEMP | \
THERMAL_TRIP_FLAG_RW_HYST)
#define THERMAL_TRIP_PRIV_TO_INT(_val_) (uintptr_t)(_val_)
#define THERMAL_INT_TO_TRIP_PRIV(_val_) (void *)(uintptr_t)(_val_)
struct cooling_spec {
unsigned long upper; /* Highest cooling state */
unsigned long lower; /* Lowest cooling state */
unsigned int weight; /* Cooling device weight */
};
struct thermal_zone_device_ops {
bool (*should_bind) (struct thermal_zone_device *,
const struct thermal_trip *,
struct thermal_cooling_device *,
struct cooling_spec *);
int (*get_temp) (struct thermal_zone_device *, int *);
int (*set_trips) (struct thermal_zone_device *, int , int );
int (*change_mode) (struct thermal_zone_device *,
enum thermal_device_mode);
int (*set_trip_temp) (struct thermal_zone_device *,
const struct thermal_trip *, int );
int (*get_crit_temp) (struct thermal_zone_device *, int *);
int (*set_emul_temp) (struct thermal_zone_device *, int );
int (*get_trend) (struct thermal_zone_device *,
const struct thermal_trip *, enum thermal_trend *);
void (*hot)(struct thermal_zone_device *);
void (*critical)(struct thermal_zone_device *);
};
struct thermal_cooling_device_ops {
int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
int (*set_cur_state) (struct thermal_cooling_device *, unsigned long );
int (*get_requested_power)(struct thermal_cooling_device *, u32 *);
int (*state2power)(struct thermal_cooling_device *, unsigned long , u32 *);
int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
};
struct thermal_cooling_device {
int id;
const char *type;
unsigned long max_state;
struct device device;
struct device_node *np;
void *devdata;
void *stats;
const struct thermal_cooling_device_ops *ops;
bool updated; /* true if the cooling device does not need update */
struct mutex lock; /* protect thermal_instances list */
struct list_head thermal_instances;
struct list_head node;
#ifdef CONFIG_THERMAL_DEBUGFS
struct thermal_debugfs *debugfs;
#endif
};
DEFINE_GUARD(cooling_dev, struct thermal_cooling_device *, mutex_lock(&_T->lock),
mutex_unlock(&_T->lock))
/* Structure to define Thermal Zone parameters */
struct thermal_zone_params {
const char *governor_name;
/*
* a boolean to indicate if the thermal to hwmon sysfs interface
* is required . when no_hwmon = = false , a hwmon sysfs interface
* will be created . when no_hwmon = = true , nothing will be done
*/
bool no_hwmon;
/*
* Sustainable power ( heat ) that this thermal zone can dissipate in
* mW
*/
u32 sustainable_power;
/*
* Proportional parameter of the PID controller when
* overshooting ( i . e . , when temperature is below the target )
*/
s32 k_po;
/*
* Proportional parameter of the PID controller when
* undershooting
*/
s32 k_pu;
/* Integral parameter of the PID controller */
s32 k_i;
/* Derivative parameter of the PID controller */
s32 k_d;
/* threshold below which the error is no longer accumulated */
s32 integral_cutoff;
/*
* @ slope : slope of a linear temperature adjustment curve .
* Used by thermal zone drivers .
*/
int slope;
/*
* @ offset : offset of a linear temperature adjustment curve .
* Used by thermal zone drivers ( default 0 ) .
*/
int offset;
};
/* Function declarations */
#ifdef CONFIG_THERMAL_OF
struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
const struct thermal_zone_device_ops *ops);
void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
#else
static inline
struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
const struct thermal_zone_device_ops *ops)
{
return ERR_PTR(-ENOTSUPP);
}
static inline void devm_thermal_of_zone_unregister(struct device *dev,
struct thermal_zone_device *tz)
{
}
#endif
int for_each_thermal_trip(struct thermal_zone_device *tz,
int (*cb)(struct thermal_trip *, void *),
void *data);
int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
int (*cb)(struct thermal_trip *, void *),
void *data);
void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
struct thermal_trip *trip, int temp);
int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp);
#ifdef CONFIG_THERMAL
struct thermal_zone_device *thermal_zone_device_register_with_trips(
const char *type,
const struct thermal_trip *trips,
int num_trips, void *devdata,
const struct thermal_zone_device_ops *ops,
const struct thermal_zone_params *tzp,
unsigned int passive_delay,
unsigned int polling_delay);
struct thermal_zone_device *thermal_tripless_zone_device_register(
const char *type,
void *devdata,
const struct thermal_zone_device_ops *ops,
const struct thermal_zone_params *tzp);
void thermal_zone_device_unregister(struct thermal_zone_device *tz);
void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
int thermal_zone_device_id(struct thermal_zone_device *tzd);
struct device *thermal_zone_device(struct thermal_zone_device *tzd);
void thermal_zone_device_update(struct thermal_zone_device *,
enum thermal_notify_event);
struct thermal_cooling_device *thermal_cooling_device_register(const char *,
void *, const struct thermal_cooling_device_ops *);
struct thermal_cooling_device *
thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
const struct thermal_cooling_device_ops *);
struct thermal_cooling_device *
devm_thermal_of_cooling_device_register(struct device *dev,
struct device_node *np,
const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops);
void thermal_cooling_device_update(struct thermal_cooling_device *);
void thermal_cooling_device_unregister(struct thermal_cooling_device *);
struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
int thermal_zone_get_slope(struct thermal_zone_device *tz);
int thermal_zone_get_offset(struct thermal_zone_device *tz);
bool thermal_trip_is_bound_to_cdev(struct thermal_zone_device *tz,
const struct thermal_trip *trip,
struct thermal_cooling_device *cdev);
int thermal_zone_device_enable(struct thermal_zone_device *tz);
int thermal_zone_device_disable(struct thermal_zone_device *tz);
void thermal_zone_device_critical(struct thermal_zone_device *tz);
#else
static inline struct thermal_zone_device *thermal_zone_device_register_with_trips(
const char *type,
const struct thermal_trip *trips,
int num_trips, void *devdata,
const struct thermal_zone_device_ops *ops,
const struct thermal_zone_params *tzp,
int passive_delay, int polling_delay)
{ return ERR_PTR(-ENODEV); }
static inline struct thermal_zone_device *thermal_tripless_zone_device_register(
const char *type,
void *devdata,
struct thermal_zone_device_ops *ops,
const struct thermal_zone_params *tzp)
{ return ERR_PTR(-ENODEV); }
static inline void thermal_zone_device_unregister(struct thermal_zone_device *tz)
{ }
static inline void thermal_zone_device_update(struct thermal_zone_device *tz,
enum thermal_notify_event event)
{ }
static inline struct thermal_cooling_device *
thermal_cooling_device_register(const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{ return ERR_PTR(-ENODEV); }
static inline struct thermal_cooling_device *
thermal_of_cooling_device_register(struct device_node *np,
const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{ return ERR_PTR(-ENODEV); }
static inline struct thermal_cooling_device *
devm_thermal_of_cooling_device_register(struct device *dev,
struct device_node *np,
const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
return ERR_PTR(-ENODEV);
}
static inline void thermal_cooling_device_unregister(
struct thermal_cooling_device *cdev)
{ }
static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
const char *name)
{ return ERR_PTR(-ENODEV); }
static inline int thermal_zone_get_temp(
struct thermal_zone_device *tz, int *temp)
{ return -ENODEV; }
static inline int thermal_zone_get_slope(
struct thermal_zone_device *tz)
{ return -ENODEV; }
static inline int thermal_zone_get_offset(
struct thermal_zone_device *tz)
{ return -ENODEV; }
static inline void *thermal_zone_device_priv(struct thermal_zone_device *tz)
{
return NULL;
}
static inline const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
{
return NULL;
}
static inline int thermal_zone_device_id(struct thermal_zone_device *tzd)
{
return -ENODEV;
}
static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
{ return -ENODEV; }
static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
{ return -ENODEV; }
#endif /* CONFIG_THERMAL */
#endif /* __THERMAL_H__ */
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