450 lines
16 KiB
C
450 lines
16 KiB
C
/* 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>
|
|
|
|
#define THERMAL_MAX_TRIPS 12
|
|
|
|
/* invalid cooling state */
|
|
#define THERMAL_CSTATE_INVALID -1UL
|
|
|
|
/* 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_attr;
|
|
|
|
enum thermal_trend {
|
|
THERMAL_TREND_STABLE, /* temperature is stable */
|
|
THERMAL_TREND_RAISING, /* temperature is raising */
|
|
THERMAL_TREND_DROPPING, /* temperature is dropping */
|
|
THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
|
|
THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
|
|
};
|
|
|
|
/* 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 */
|
|
};
|
|
|
|
struct thermal_zone_device_ops {
|
|
int (*bind) (struct thermal_zone_device *,
|
|
struct thermal_cooling_device *);
|
|
int (*unbind) (struct thermal_zone_device *,
|
|
struct thermal_cooling_device *);
|
|
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 (*get_trip_type) (struct thermal_zone_device *, int,
|
|
enum thermal_trip_type *);
|
|
int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
|
|
int (*set_trip_temp) (struct thermal_zone_device *, int, int);
|
|
int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
|
|
int (*set_trip_hyst) (struct thermal_zone_device *, int, 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 *, int,
|
|
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;
|
|
char *type;
|
|
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;
|
|
};
|
|
|
|
/**
|
|
* struct thermal_zone_device - structure for a thermal zone
|
|
* @id: unique id number for each thermal zone
|
|
* @type: the thermal zone device type
|
|
* @device: &struct device for this thermal zone
|
|
* @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
|
|
* @trip_type_attrs: attributes for trip points for sysfs: trip type
|
|
* @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
|
|
* @mode: current mode of this thermal zone
|
|
* @devdata: private pointer for device private data
|
|
* @trips: number of trip points the thermal zone supports
|
|
* @trips_disabled; bitmap for disabled trips
|
|
* @passive_delay_jiffies: number of jiffies to wait between polls when
|
|
* performing passive cooling.
|
|
* @polling_delay_jiffies: number of jiffies to wait between polls when
|
|
* checking whether trip points have been crossed (0 for
|
|
* interrupt driven systems)
|
|
* @temperature: current temperature. This is only for core code,
|
|
* drivers should use thermal_zone_get_temp() to get the
|
|
* current temperature
|
|
* @last_temperature: previous temperature read
|
|
* @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
|
|
* @passive: 1 if you've crossed a passive trip point, 0 otherwise.
|
|
* @prev_low_trip: the low current temperature if you've crossed a passive
|
|
trip point.
|
|
* @prev_high_trip: the above current temperature if you've crossed a
|
|
passive trip point.
|
|
* @need_update: if equals 1, thermal_zone_device_update needs to be invoked.
|
|
* @ops: operations this &thermal_zone_device supports
|
|
* @tzp: thermal zone parameters
|
|
* @governor: pointer to the governor for this thermal zone
|
|
* @governor_data: private pointer for governor data
|
|
* @thermal_instances: list of &struct thermal_instance of this thermal zone
|
|
* @ida: &struct ida to generate unique id for this zone's cooling
|
|
* devices
|
|
* @lock: lock to protect thermal_instances list
|
|
* @node: node in thermal_tz_list (in thermal_core.c)
|
|
* @poll_queue: delayed work for polling
|
|
* @notify_event: Last notification event
|
|
*/
|
|
struct thermal_zone_device {
|
|
int id;
|
|
char type[THERMAL_NAME_LENGTH];
|
|
struct device device;
|
|
struct attribute_group trips_attribute_group;
|
|
struct thermal_attr *trip_temp_attrs;
|
|
struct thermal_attr *trip_type_attrs;
|
|
struct thermal_attr *trip_hyst_attrs;
|
|
enum thermal_device_mode mode;
|
|
void *devdata;
|
|
int trips;
|
|
unsigned long trips_disabled; /* bitmap for disabled trips */
|
|
unsigned long passive_delay_jiffies;
|
|
unsigned long polling_delay_jiffies;
|
|
int temperature;
|
|
int last_temperature;
|
|
int emul_temperature;
|
|
int passive;
|
|
int prev_low_trip;
|
|
int prev_high_trip;
|
|
atomic_t need_update;
|
|
struct thermal_zone_device_ops *ops;
|
|
struct thermal_zone_params *tzp;
|
|
struct thermal_governor *governor;
|
|
void *governor_data;
|
|
struct list_head thermal_instances;
|
|
struct ida ida;
|
|
struct mutex lock;
|
|
struct list_head node;
|
|
struct delayed_work poll_queue;
|
|
enum thermal_notify_event notify_event;
|
|
};
|
|
|
|
/**
|
|
* struct thermal_governor - structure that holds thermal governor information
|
|
* @name: name of the governor
|
|
* @bind_to_tz: callback called when binding to a thermal zone. If it
|
|
* returns 0, the governor is bound to the thermal zone,
|
|
* otherwise it fails.
|
|
* @unbind_from_tz: callback called when a governor is unbound from a
|
|
* thermal zone.
|
|
* @throttle: callback called for every trip point even if temperature is
|
|
* below the trip point temperature
|
|
* @governor_list: node in thermal_governor_list (in thermal_core.c)
|
|
*/
|
|
struct thermal_governor {
|
|
char name[THERMAL_NAME_LENGTH];
|
|
int (*bind_to_tz)(struct thermal_zone_device *tz);
|
|
void (*unbind_from_tz)(struct thermal_zone_device *tz);
|
|
int (*throttle)(struct thermal_zone_device *tz, int trip);
|
|
struct list_head governor_list;
|
|
};
|
|
|
|
/* Structure that holds binding parameters for a zone */
|
|
struct thermal_bind_params {
|
|
struct thermal_cooling_device *cdev;
|
|
|
|
/*
|
|
* This is a measure of 'how effectively these devices can
|
|
* cool 'this' thermal zone. It shall be determined by
|
|
* platform characterization. This value is relative to the
|
|
* rest of the weights so a cooling device whose weight is
|
|
* double that of another cooling device is twice as
|
|
* effective. See Documentation/driver-api/thermal/sysfs-api.rst for more
|
|
* information.
|
|
*/
|
|
int weight;
|
|
|
|
/*
|
|
* This is a bit mask that gives the binding relation between this
|
|
* thermal zone and cdev, for a particular trip point.
|
|
* See Documentation/driver-api/thermal/sysfs-api.rst for more information.
|
|
*/
|
|
int trip_mask;
|
|
|
|
/*
|
|
* This is an array of cooling state limits. Must have exactly
|
|
* 2 * thermal_zone.number_of_trip_points. It is an array consisting
|
|
* of tuples <lower-state upper-state> of state limits. Each trip
|
|
* will be associated with one state limit tuple when binding.
|
|
* A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
|
|
* on all trips.
|
|
*/
|
|
unsigned long *binding_limits;
|
|
int (*match) (struct thermal_zone_device *tz,
|
|
struct thermal_cooling_device *cdev);
|
|
};
|
|
|
|
/* Structure to define Thermal Zone parameters */
|
|
struct thermal_zone_params {
|
|
char governor_name[THERMAL_NAME_LENGTH];
|
|
|
|
/*
|
|
* 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;
|
|
|
|
int num_tbps; /* Number of tbp entries */
|
|
struct thermal_bind_params *tbp;
|
|
|
|
/*
|
|
* 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;
|
|
};
|
|
|
|
/**
|
|
* struct thermal_zone_of_device_ops - callbacks for handling DT based zones
|
|
*
|
|
* Mandatory:
|
|
* @get_temp: a pointer to a function that reads the sensor temperature.
|
|
*
|
|
* Optional:
|
|
* @get_trend: a pointer to a function that reads the sensor temperature trend.
|
|
* @set_trips: a pointer to a function that sets a temperature window. When
|
|
* this window is left the driver must inform the thermal core via
|
|
* thermal_zone_device_update.
|
|
* @set_emul_temp: a pointer to a function that sets sensor emulated
|
|
* temperature.
|
|
* @set_trip_temp: a pointer to a function that sets the trip temperature on
|
|
* hardware.
|
|
* @change_mode: a pointer to a function that notifies the thermal zone
|
|
* mode change.
|
|
*/
|
|
struct thermal_zone_of_device_ops {
|
|
int (*get_temp)(void *, int *);
|
|
int (*get_trend)(void *, int, enum thermal_trend *);
|
|
int (*set_trips)(void *, int, int);
|
|
int (*set_emul_temp)(void *, int);
|
|
int (*set_trip_temp)(void *, int, int);
|
|
int (*change_mode) (void *, enum thermal_device_mode);
|
|
};
|
|
|
|
/* Function declarations */
|
|
#ifdef CONFIG_THERMAL_OF
|
|
int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
|
|
struct device_node *sensor_np,
|
|
u32 *id);
|
|
struct thermal_zone_device *
|
|
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
|
|
const struct thermal_zone_of_device_ops *ops);
|
|
void thermal_zone_of_sensor_unregister(struct device *dev,
|
|
struct thermal_zone_device *tz);
|
|
struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
|
|
struct device *dev, int id, void *data,
|
|
const struct thermal_zone_of_device_ops *ops);
|
|
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
|
|
struct thermal_zone_device *tz);
|
|
#else
|
|
|
|
static inline int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
|
|
struct device_node *sensor_np,
|
|
u32 *id)
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
static inline struct thermal_zone_device *
|
|
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
|
|
const struct thermal_zone_of_device_ops *ops)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline
|
|
void thermal_zone_of_sensor_unregister(struct device *dev,
|
|
struct thermal_zone_device *tz)
|
|
{
|
|
}
|
|
|
|
static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
|
|
struct device *dev, int id, void *data,
|
|
const struct thermal_zone_of_device_ops *ops)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline
|
|
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
|
|
struct thermal_zone_device *tz)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_THERMAL
|
|
struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
|
|
void *, struct thermal_zone_device_ops *,
|
|
struct thermal_zone_params *, int, int);
|
|
void thermal_zone_device_unregister(struct thermal_zone_device *);
|
|
|
|
int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
|
|
struct thermal_cooling_device *,
|
|
unsigned long, unsigned long,
|
|
unsigned int);
|
|
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
|
|
struct thermal_cooling_device *);
|
|
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,
|
|
char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops);
|
|
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);
|
|
|
|
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(
|
|
const char *type, int trips, int mask, void *devdata,
|
|
struct thermal_zone_device_ops *ops,
|
|
struct thermal_zone_params *tzp,
|
|
int passive_delay, int polling_delay)
|
|
{ return ERR_PTR(-ENODEV); }
|
|
static inline void thermal_zone_device_unregister(
|
|
struct thermal_zone_device *tz)
|
|
{ }
|
|
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,
|
|
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 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__ */
|