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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * thermal.h ($Revision: 0 $)
- *
- * Copyright (C) 2008 Intel Corp
- * Copyright (C) 2008 Zhang Rui <[email protected]>
- * Copyright (C) 2008 Sujith Thomas <[email protected]>
- */
- #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 <linux/android_kabi.h>
- #include <uapi/linux/thermal.h>
- /* 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 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 *);
- ANDROID_KABI_RESERVE(1);
- };
- /**
- * struct thermal_trip - representation of a point in temperature domain
- * @temperature: temperature value in miliCelsius
- * @hysteresis: relative hysteresis in miliCelsius
- * @type: trip point type
- */
- struct thermal_trip {
- int temperature;
- int hysteresis;
- enum thermal_trip_type 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 *, u32 *);
- int (*state2power)(struct thermal_cooling_device *, unsigned long, u32 *);
- int (*power2state)(struct thermal_cooling_device *, u32, unsigned long *);
- ANDROID_KABI_RESERVE(1);
- };
- struct thermal_cooling_device {
- int id;
- 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;
- ANDROID_KABI_RESERVE(1);
- };
- /**
- * 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: an array of struct thermal_trip
- * @num_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;
- struct thermal_trip *trips;
- int num_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;
- ANDROID_KABI_RESERVE(1);
- };
- /**
- * 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;
- ANDROID_KABI_RESERVE(1);
- };
- /* 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);
- ANDROID_KABI_RESERVE(1);
- };
- /* 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;
- ANDROID_KABI_RESERVE(1);
- };
- /* Function declarations */
- #ifdef CONFIG_THERMAL_OF
- struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor, int id, void *data,
- const struct thermal_zone_device_ops *ops);
- struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
- const struct thermal_zone_device_ops *ops);
- void thermal_of_zone_unregister(struct thermal_zone_device *tz);
- void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
- void thermal_of_zone_unregister(struct thermal_zone_device *tz);
- #else
- static inline
- struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor, int id, void *data,
- const struct thermal_zone_device_ops *ops)
- {
- return ERR_PTR(-ENOTSUPP);
- }
- 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 thermal_of_zone_unregister(struct thermal_zone_device *tz)
- {
- }
- static inline void devm_thermal_of_zone_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 *);
- struct thermal_zone_device *
- thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int, int,
- void *, struct thermal_zone_device_ops *,
- struct thermal_zone_params *, int, int);
- 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__ */
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