Release 4.7 include/linux/thermal.h

/*
 *  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>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#ifndef __THERMAL_H__

#define __THERMAL_H__

#include <linux/of.h>
#include <linux/idr.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <uapi/linux/thermal.h>


#define THERMAL_TRIPS_NONE	-1

#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

/* Unit conversion macros */

#define DECI_KELVIN_TO_CELSIUS(t)	({                      \
        long _t = (t);                                          \
        ((_t-2732 >= 0) ? (_t-2732+5)/10 : (_t-2732-5)/10);     \
})

#define CELSIUS_TO_DECI_KELVIN(t)	((t)*10+2732)

#define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)

#define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)

#define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))

#define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)

/* 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"
#endif

struct thermal_zone_device;
struct thermal_cooling_device;
struct thermal_instance;


enum thermal_device_mode {
	
THERMAL_DEVICE_DISABLED = 0,
	
THERMAL_DEVICE_ENABLED,
};


enum thermal_trip_type {
	
THERMAL_TRIP_ACTIVE = 0,
	
THERMAL_TRIP_PASSIVE,
	
THERMAL_TRIP_HOT,
	
THERMAL_TRIP_CRITICAL,
};


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 */
};


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 (*get_mode) (struct thermal_zone_device *,
			 enum thermal_device_mode *);
	
int (*set_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 *);
	
int (*notify) (struct thermal_zone_device *, int,
		       enum thermal_trip_type);
};


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 *,
				   struct thermal_zone_device *, u32 *);
	
int (*state2power)(struct thermal_cooling_device *,
			   struct thermal_zone_device *, unsigned long, u32 *);
	
int (*power2state)(struct thermal_cooling_device *,
			   struct thermal_zone_device *, u32, unsigned long *);
};


struct thermal_cooling_device {
	
int id;
	
char type[THERMAL_NAME_LENGTH];
	
struct device device;
	
struct device_node *np;
	
void *devdata;
	
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_attr {
	
struct device_attribute attr;
	
char name[THERMAL_NAME_LENGTH];
};

/**
 * 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
 * @devdata:    private pointer for device private data
 * @trips:      number of trip points the thermal zone supports
 * @trips_disabled;     bitmap for disabled trips
 * @passive_delay:      number of milliseconds to wait between polls when
 *                      performing passive cooling.
 * @polling_delay:      number of milliseconds 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.
 * @forced_passive:     If > 0, temperature at which to switch on all ACPI
 *                      processor cooling devices.  Currently only used by the
 *                      step-wise governor.
 * @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
 * @idr:        &struct idr 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
 */

struct thermal_zone_device {
	
int id;
	
char type[THERMAL_NAME_LENGTH];
	
struct device device;
	
struct thermal_attr *trip_temp_attrs;
	
struct thermal_attr *trip_type_attrs;
	
struct thermal_attr *trip_hyst_attrs;
	
void *devdata;
	
int trips;
	
unsigned long trips_disabled;	/* bitmap for disabled trips */
	
int passive_delay;
	
int polling_delay;
	
int temperature;
	
int last_temperature;
	
int emul_temperature;
	
int passive;
	
unsigned int forced_passive;
	
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 idr idr;
	
struct mutex lock;
	
struct list_head node;
	
struct delayed_work poll_queue;
};

/**
 * 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/thermal/sysfs-api.txt 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/thermal/sysfs-api.txt 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_genl_event {
	
u32 orig;
	
enum events event;
};

/**
 * struct thermal_zone_of_device_ops - scallbacks 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_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.
 */

struct thermal_zone_of_device_ops {
	
int (*get_temp)(void *, int *);
	
int (*get_trend)(void *, long *);
	
int (*set_emul_temp)(void *, int);
	
int (*set_trip_temp)(void *, int, int);
};

/**
 * struct thermal_trip - representation of a point in temperature domain
 * @np: pointer to struct device_node that this trip point was created from
 * @temperature: temperature value in miliCelsius
 * @hysteresis: relative hysteresis in miliCelsius
 * @type: trip point type
 */


struct thermal_trip {
	
struct device_node *np;
	
int temperature;
	
int hysteresis;
	
enum thermal_trip_type type;
};

/* Function declarations */
#ifdef CONFIG_THERMAL_OF
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 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);
}

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static inline

void thermal_zone_of_sensor_unregister(struct device *dev,
				       struct thermal_zone_device *tz)
{
}

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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);
}

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static inline

void devm_thermal_zone_of_sensor_unregister(struct device *dev,
					    struct thermal_zone_device *tz)
{
}

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#endif

#if IS_ENABLED(CONFIG_THERMAL)


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

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int power_actor_get_max_power(struct thermal_cooling_device *,
			      struct thermal_zone_device *tz, u32 *max_power);
int power_actor_get_min_power(struct thermal_cooling_device *,
			      struct thermal_zone_device *tz, u32 *min_power);
int power_actor_set_power(struct thermal_cooling_device *,
			  struct thermal_instance *, u32);
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 *);

struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
		const struct thermal_cooling_device_ops *);
struct thermal_cooling_device *
thermal_of_cooling_device_register(struct device_node *np, char *, void *,
				   const struct thermal_cooling_device_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 get_tz_trend(struct thermal_zone_device *, int);
struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
		struct thermal_cooling_device *, int);
void thermal_cdev_update(struct thermal_cooling_device *);
void thermal_notify_framework(struct thermal_zone_device *, int);
#else


static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
{ return false; }
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static inline int power_actor_get_max_power(struct thermal_cooling_device *cdev,
			      struct thermal_zone_device *tz, u32 *max_power)
{ return 0; }
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static inline int power_actor_get_min_power(struct thermal_cooling_device *cdev,
					    struct thermal_zone_device *tz,
					    u32 *min_power)
{ return -ENODEV; }
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static inline int power_actor_set_power(struct thermal_cooling_device *cdev,
			  struct thermal_instance *tz, u32 power)
{ return 0; }
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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,
	const struct thermal_zone_params *tzp,
	int passive_delay, int polling_delay)
{ return ERR_PTR(-ENODEV); }
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static inline void thermal_zone_device_unregister(
	struct thermal_zone_device *tz)
{ }
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static inline int thermal_zone_bind_cooling_device(
	struct thermal_zone_device *tz, int trip,
	struct thermal_cooling_device *cdev,
	unsigned long upper, unsigned long lower,
	unsigned int weight)
{ return -ENODEV; }
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static inline int thermal_zone_unbind_cooling_device(
	struct thermal_zone_device *tz, int trip,
	struct thermal_cooling_device *cdev)
{ return -ENODEV; }
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static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
{ }
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static inline struct thermal_cooling_device *

thermal_cooling_device_register(char *type, void *devdata,
	const struct thermal_cooling_device_ops *ops)
{ return ERR_PTR(-ENODEV); }
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static inline struct thermal_cooling_device *

thermal_of_cooling_device_register(struct device_node *np,
	char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
{ return ERR_PTR(-ENODEV); }
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static inline void thermal_cooling_device_unregister(
	struct thermal_cooling_device *cdev)
{ }
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static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
		const char *name)
{ return ERR_PTR(-ENODEV); }
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static inline int thermal_zone_get_temp(
		struct thermal_zone_device *tz, int *temp)
{ return -ENODEV; }
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static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
{ return -ENODEV; }
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static inline struct thermal_instance *

get_thermal_instance(struct thermal_zone_device *tz,
	struct thermal_cooling_device *cdev, int trip)
{ return ERR_PTR(-ENODEV); }
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static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
{ }
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static inline void thermal_notify_framework(struct thermal_zone_device *tz,
	int trip)
{ }
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#endif /* CONFIG_THERMAL */

#if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
						enum events event);
#else


static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
						enum events event)
{
	return 0;
}
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#endif

#endif /* __THERMAL_H__ */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
442
23.66%
14
21.88%
nishanth menon
nishanth menon
336
17.99%
1
1.56%
javi merino
javi merino
293
15.69%
5
7.81%
durgadoss r
durgadoss r
269
14.40%
10
15.62%
eduardo valentin
eduardo valentin
208
11.13%
10
15.62%
laxman dewangan
laxman dewangan
88
4.71%
1
1.56%
matthew garrett
matthew garrett
85
4.55%
3
4.69%
aaron lu
aaron lu
32
1.71%
2
3.12%
lukasz majewski
lukasz majewski
23
1.23%
2
3.12%
rafael j. wysocki
rafael j. wysocki
18
0.96%
1
1.56%
amit daniel kachhap
amit daniel kachhap
15
0.80%
1
1.56%
ni wade
ni wade
14
0.75%
1
1.56%
sascha hauer
sascha hauer
11
0.59%
1
1.56%
kapileshwar singh
kapileshwar singh
8
0.43%
1
1.56%
punit agrawal
punit agrawal
6
0.32%
2
3.12%
arnd bergmann
arnd bergmann
4
0.21%
1
1.56%
chen yu
chen yu
3
0.16%
1
1.56%
rasmus villemoes
rasmus villemoes
3
0.16%
1
1.56%
florian fainelli
florian fainelli
3
0.16%
1
1.56%
alan cox
alan cox
2
0.11%
1
1.56%
jean delvare
jean delvare
2
0.11%
1
1.56%
ezequiel garcia
ezequiel garcia
1
0.05%
1
1.56%
caesar wang
caesar wang
1
0.05%
1
1.56%
anton vorontsov
anton vorontsov
1
0.05%
1
1.56%
Total
1868
100.00%
64
100.00%
  
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