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