Lines Matching +full:cooling +full:- +full:device

16 devices (sensors) and thermal cooling devices (fan, processor...) to register
19 This how-to focuses on enabling new thermal zone and cooling devices to
22 and cooling devices should be able to make use of the infrastructure.
25 as well as cooling device attributes to the user space.
30 - `[0-*]` denotes any positive number starting from 0
31 - `[1-*]` denotes any positive number starting from 1
36 1.1 thermal zone device interface
37 ---------------------------------
48 This interface function adds a new thermal zone device (sensor) to
49 /sys/class/thermal folder as `thermal_zone[0-*]`. It tries to bind all the
50 thermal cooling devices registered at the same time.
59 device private data
61 thermal zone device call-backs.
64 bind the thermal zone device with a thermal cooling device.
66 unbind the thermal zone device with a thermal cooling device.
76 - "enabled" means the kernel thermal management is
78 - "disabled" will prevent kernel thermal driver action
95 performing passive cooling.
104 This interface function removes the thermal zone device.
106 unbinds all the thermal cooling devices it uses.
111 *thermal_zone_of_sensor_register(struct device *dev, int sensor_id,
117 device tree and look for the zone that refer to the sensor device
118 pointed by dev->of_node as temperature providers. For the zone
120 thermal zone device.
125 Device node of sensor containing valid node pointer in
126 dev->of_node.
154 It returns error pointer if fails otherwise valid thermal zone device
160 void thermal_zone_of_sensor_unregister(struct device *dev,
166 thermal zone device registered with thermal_zone_of_sensor_register()
168 get_trend() thermal zone device callbacks.
173 *devm_thermal_zone_of_sensor_register(struct device *dev,
191 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
206 for the thermal zone device, which might be useful for platform
214 for the thermal zone device, which might be useful for platform
217 1.2 thermal cooling device interface
218 ------------------------------------
227 This interface function adds a new thermal cooling device (fan/processor/...)
228 to /sys/class/thermal/ folder as `cooling_device[0-*]`. It tries to bind itself
232 the cooling device name.
234 device private data.
236 thermal cooling devices call-backs.
239 get the Maximum throttle state of the cooling device.
242 cooling device.
244 set the Current throttle state of the cooling device.
250 This interface function removes the thermal cooling device.
254 1.3 interface for binding a thermal zone device with a thermal cooling device
255 -----------------------------------------------------------------------------
263 This interface function binds a thermal cooling device to a particular trip
264 point of a thermal zone device.
266 This function is usually called in the thermal zone device .bind callback.
269 the thermal zone device
271 thermal cooling device
273 indicates which trip point in this thermal zone the cooling device
276 the Maximum cooling state for this trip point.
278 and the cooling device can be in max_state.
280 the Minimum cooling state can be used for this trip point.
282 and the cooling device can be in cooling state 0.
284 the influence of this cooling device in this thermal
292 This interface function unbinds a thermal cooling device from a particular
293 trip point of a thermal zone device. This function is usually called in
294 the thermal zone device .unbind callback.
297 the thermal zone device
299 thermal cooling device
301 indicates which trip point in this thermal zone the cooling device
305 ---------------------------
338 Thermal zone device sys I/F, created once it's registered::
340 /sys/class/thermal/thermal_zone[0-*]:
341 |---type: Type of the thermal zone
342 |---temp: Current temperature
343 |---mode: Working mode of the thermal zone
344 |---policy: Thermal governor used for this zone
345 |---available_policies: Available thermal governors for this zone
346 |---trip_point_[0-*]_temp: Trip point temperature
347 |---trip_point_[0-*]_type: Trip point type
348 |---trip_point_[0-*]_hyst: Hysteresis value for this trip point
349 |---emul_temp: Emulated temperature set node
350 |---sustainable_power: Sustainable dissipatable power
351 |---k_po: Proportional term during temperature overshoot
352 |---k_pu: Proportional term during temperature undershoot
353 |---k_i: PID's integral term in the power allocator gov
354 |---k_d: PID's derivative term in the power allocator
355 |---integral_cutoff: Offset above which errors are accumulated
356 |---slope: Slope constant applied as linear extrapolation
357 |---offset: Offset constant applied as linear extrapolation
359 Thermal cooling device sys I/F, created once it's registered::
361 /sys/class/thermal/cooling_device[0-*]:
362 |---type: Type of the cooling device(processor/fan/...)
363 |---max_state: Maximum cooling state of the cooling device
364 |---cur_state: Current cooling state of the cooling device
365 |---stats: Directory containing cooling device's statistics
366 |---stats/reset: Writing any value resets the statistics
367 |---stats/time_in_state_ms: Time (msec) spent in various cooling states
368 |---stats/total_trans: Total number of times cooling state is changed
369 |---stats/trans_table: Cooling state transition table
373 the relationship between a thermal zone and its associated cooling device.
379 /sys/class/thermal/thermal_zone[0-*]:
380 |---cdev[0-*]: [0-*]th cooling device in current thermal zone
381 |---cdev[0-*]_trip_point: Trip point that cdev[0-*] is associated with
382 |---cdev[0-*]_weight: Influence of the cooling device in
385 Besides the thermal zone device sysfs I/F and cooling device sysfs I/F,
387 of thermal zone device. E.g. the generic thermal driver registers one hwmon
388 class device and build the associated hwmon sysfs I/F for all the registered
391 Please read Documentation/ABI/testing/sysfs-class-thermal for thermal
392 zone and cooling device attribute details.
396 /sys/class/hwmon/hwmon[0-*]:
397 |---name: The type of the thermal zone devices
398 |---temp[1-*]_input: The current temperature of thermal zone [1-*]
399 |---temp[1-*]_critical: The critical trip point of thermal zone [1-*]
401 Please read Documentation/hwmon/sysfs-interface.rst for additional information.
412 effectiveness in cooling the thermal zone.
419 |---type: acpitz
420 |---temp: 37000
421 |---mode: enabled
422 |---policy: step_wise
423 |---available_policies: step_wise fair_share
424 |---trip_point_0_temp: 100000
425 |---trip_point_0_type: critical
426 |---trip_point_1_temp: 80000
427 |---trip_point_1_type: passive
428 |---trip_point_2_temp: 70000
429 |---trip_point_2_type: active0
430 |---trip_point_3_temp: 60000
431 |---trip_point_3_type: active1
432 |---cdev0: --->/sys/class/thermal/cooling_device0
433 |---cdev0_trip_point: 1 /* cdev0 can be used for passive */
434 |---cdev0_weight: 1024
435 |---cdev1: --->/sys/class/thermal/cooling_device3
436 |---cdev1_trip_point: 2 /* cdev1 can be used for active[0]*/
437 |---cdev1_weight: 1024
440 |---type: Processor
441 |---max_state: 8
442 |---cur_state: 0
445 |---type: Fan
446 |---max_state: 2
447 |---cur_state: 0
451 |---name: acpitz
452 |---temp1_input: 37000
453 |---temp1_crit: 100000
459 -----------------
468 -------------------------
475 ------------------------
477 This function serves as an arbitrator to set the state of a cooling
478 device. It sets the cooling device to the deepest cooling state if
487 but accepts a delay after which it proceeds doing a forced power-off
494 carefully profiled non-zero positive value is a must for emergency