the generic thermal sysfs driver
The Generic Thermal sysfs driver for thermal management. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Thomas Sujith <sujith.thomas@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>hifive-unleashed-5.1
Zhang Rui
Len Brown
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aa62999269
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203d3d4aa4
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Generic Thermal Sysfs driver How To
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=========================
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Written by Sujith Thomas <sujith.thomas@intel.com>, Zhang Rui <rui.zhang@intel.com>
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Updated: 2 January 2008
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Copyright (c) 2008 Intel Corporation
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0. Introduction
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The generic thermal sysfs provides a set of interfaces for thermal zone devices (sensors)
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and thermal cooling devices (fan, processor...) to register with the thermal management
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solution and to be a part of it.
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This how-to focusses on enabling new thermal zone and cooling devices to participate
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in thermal management.
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This solution is platform independent and any type of thermal zone devices and
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cooling devices should be able to make use of the infrastructure.
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The main task of the thermal sysfs driver is to expose thermal zone attributes as well
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as cooling device attributes to the user space.
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An intelligent thermal management application can make decisions based on inputs
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from thermal zone attributes (the current temperature and trip point temperature)
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and throttle appropriate devices.
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[0-*] denotes any positive number starting from 0
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[1-*] denotes any positive number starting from 1
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1. thermal sysfs driver interface functions
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1.1 thermal zone device interface
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1.1.1 struct thermal_zone_device *thermal_zone_device_register(char *name, int trips,
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void *devdata, struct thermal_zone_device_ops *ops)
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This interface function adds a new thermal zone device (sensor) to
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/sys/class/thermal folder as thermal_zone[0-*].
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It tries to bind all the thermal cooling devices registered at the same time.
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name: the thermal zone name.
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trips: the total number of trip points this thermal zone supports.
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devdata: device private data
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ops: thermal zone device callbacks.
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.bind: bind the thermal zone device with a thermal cooling device.
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.unbind: unbing the thermal zone device with a thermal cooling device.
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.get_temp: get the current temperature of the thermal zone.
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.get_mode: get the current mode (user/kernel) of the thermal zone.
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"kernel" means thermal management is done in kernel.
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"user" will prevent kernel thermal driver actions upon trip points
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so that user applications can take charge of thermal management.
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.set_mode: set the mode (user/kernel) of the thermal zone.
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.get_trip_type: get the type of certain trip point.
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.get_trip_temp: get the temperature above which the certain trip point
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will be fired.
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1.1.2 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
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This interface function removes the thermal zone device.
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It deletes the corresponding entry form /sys/class/thermal folder and unbind all
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the thermal cooling devices it uses.
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1.2 thermal cooling device interface
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1.2.1 struct thermal_cooling_device *thermal_cooling_device_register(char *name,
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void *devdata, struct thermal_cooling_device_ops *)
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This interface function adds a new thermal cooling device (fan/processor/...) to
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/sys/class/thermal/ folder as cooling_device[0-*].
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It tries to bind itself to all the thermal zone devices register at the same time.
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name: the cooling device name.
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devdata: device private data.
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ops: thermal cooling devices callbacks.
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.get_max_state: get the Maximum throttle state of the cooling device.
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.get_cur_state: get the Current throttle state of the cooling device.
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.set_cur_state: set the Current throttle state of the cooling device.
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1.2.2 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
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This interface function remove the thermal cooling device.
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It deletes the corresponding entry form /sys/class/thermal folder and unbind
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itself from all the thermal zone devices using it.
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1.3 interface for binding a thermal zone device with a thermal cooling device
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1.3.1 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
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int trip, struct thermal_cooling_device *cdev);
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This interface function bind a thermal cooling device to the certain trip point
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of a thermal zone device.
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This function is usually called in the thermal zone device .bind callback.
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tz: the thermal zone device
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cdev: thermal cooling device
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trip: indicates which trip point the cooling devices is associated with
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in this thermal zone.
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1.3.2 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
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int trip, struct thermal_cooling_device *cdev);
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This interface function unbind a thermal cooling device from the certain trip point
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of a thermal zone device.
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This function is usually called in the thermal zone device .unbind callback.
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tz: the thermal zone device
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cdev: thermal cooling device
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trip: indicates which trip point the cooling devices is associated with
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in this thermal zone.
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2. sysfs attributes structure
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RO read only value
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RW read/write value
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All thermal sysfs attributes will be represented under /sys/class/thermal
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/sys/class/thermal/
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Thermal zone device sys I/F, created once it's registered:
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|thermal_zone[0-*]:
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|-----type: Type of the thermal zone
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|-----temp: Current temperature
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|-----mode: Working mode of the thermal zone
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|-----trip_point_[0-*]_temp: Trip point temperature
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|-----trip_point_[0-*]_type: Trip point type
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Thermal cooling device sys I/F, created once it's registered:
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|cooling_device[0-*]:
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|-----type : Type of the cooling device(processor/fan/...)
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|-----max_state: Maximum cooling state of the cooling device
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|-----cur_state: Current cooling state of the cooling device
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These two dynamic attributes are created/removed in pairs.
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They represent the relationship between a thermal zone and its associated cooling device.
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They are created/removed for each
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thermal_zone_bind_cooling_device/thermal_zone_unbind_cooling_device successful exection.
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|thermal_zone[0-*]
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|-----cdev[0-*]: The [0-*]th cooling device in the current thermal zone
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|-----cdev[0-*]_trip_point: Trip point that cdev[0-*] is associated with
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***************************
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* Thermal zone attributes *
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***************************
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type Strings which represent the thermal zone type.
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This is given by thermal zone driver as part of registration.
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Eg: "ACPI thermal zone" indicates it's a ACPI thermal device
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RO
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Optional
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temp Current temperature as reported by thermal zone (sensor)
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Unit: degree celsius
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RO
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Required
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mode One of the predifned values in [kernel, user]
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This file gives information about the algorithm
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that is currently managing the thermal zone.
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It can be either default kernel based algorithm
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or user space application.
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RW
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Optional
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kernel = Thermal management in kernel thermal zone driver.
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user = Preventing kernel thermal zone driver actions upon
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trip points so that user application can take full
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charge of the thermal management.
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trip_point_[0-*]_temp The temperature above which trip point will be fired
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Unit: degree celsius
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RO
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Optional
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trip_point_[0-*]_type Strings which indicate the type of the trip point
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Eg. it can be one of critical, hot, passive,
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active[0-*] for ACPI thermal zone.
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RO
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Optional
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cdev[0-*] Sysfs link to the thermal cooling device node where the sys I/F
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for cooling device throttling control represents.
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RO
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Optional
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cdev[0-*]_trip_point The trip point with which cdev[0-*] is assocated in this thermal zone
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-1 means the cooling device is not associated with any trip point.
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RO
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Optional
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******************************
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* Cooling device attributes *
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******************************
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type String which represents the type of device
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eg: For generic ACPI: this should be "Fan",
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"Processor" or "LCD"
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eg. For memory controller device on intel_menlow platform:
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this should be "Memory controller"
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RO
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Optional
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max_state The maximum permissible cooling state of this cooling device.
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RO
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Required
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cur_state The current cooling state of this cooling device.
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the value can any integer numbers between 0 and max_state,
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cur_state == 0 means no cooling
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cur_state == max_state means the maximum cooling.
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RW
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Required
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3. A simple implementation
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ACPI thermal zone may support multiple trip points like critical/hot/passive/active.
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If an ACPI thermal zone supports critical, passive, active[0] and active[1] at the same time,
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it may register itself as a thermale_zone_device (thermal_zone1) with 4 trip points in all.
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It has one processor and one fan, which are both registered as thermal_cooling_device.
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If the processor is listed in _PSL method, and the fan is listed in _AL0 method,
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the sys I/F structure will be built like this:
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/sys/class/thermal:
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|thermal_zone1:
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|-----type: ACPI thermal zone
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|-----temp: 37
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|-----mode: kernel
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|-----trip_point_0_temp: 100
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|-----trip_point_0_type: critical
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|-----trip_point_1_temp: 80
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|-----trip_point_1_type: passive
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|-----trip_point_2_temp: 70
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|-----trip_point_2_type: active[0]
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|-----trip_point_3_temp: 60
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|-----trip_point_3_type: active[1]
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|-----cdev0: --->/sys/class/thermal/cooling_device0
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|-----cdev0_trip_point: 1 /* cdev0 can be used for passive */
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|-----cdev1: --->/sys/class/thermal/cooling_device3
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|-----cdev1_trip_point: 2 /* cdev1 can be used for active[0]*/
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|cooling_device0:
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|-----type: Processor
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|-----max_state: 8
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|-----cur_state: 0
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|cooling_device3:
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|-----type: Fan
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|-----max_state: 2
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|-----cur_state: 0
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@ -58,6 +58,8 @@ source "drivers/power/Kconfig"
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source "drivers/hwmon/Kconfig"
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source "drivers/thermal/Kconfig"
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source "drivers/watchdog/Kconfig"
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source "drivers/ssb/Kconfig"
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@ -64,6 +64,7 @@ obj-y += i2c/
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obj-$(CONFIG_W1) += w1/
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obj-$(CONFIG_POWER_SUPPLY) += power/
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obj-$(CONFIG_HWMON) += hwmon/
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obj-$(CONFIG_THERMAL) += thermal/
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obj-$(CONFIG_WATCHDOG) += watchdog/
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obj-$(CONFIG_PHONE) += telephony/
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obj-$(CONFIG_MD) += md/
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#
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# Generic thermal sysfs drivers configuration
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#
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menuconfig THERMAL
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bool "Generic Thermal sysfs driver"
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default y
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help
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Generic Thermal Sysfs driver offers a generic mechanism for
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thermal management. Usually it's made up of one or more thermal
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zone and cooling device.
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each thermal zone contains its own temperature, trip points,
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cooling devices.
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All platforms with ACPI thermal support can use this driver.
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If you want this support, you should say Y here
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#
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# Makefile for sensor chip drivers.
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#
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obj-$(CONFIG_THERMAL) += thermal.o
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/*
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* thermal.c - Generic Thermal Management Sysfs support.
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kdev_t.h>
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#include <linux/idr.h>
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#include <linux/thermal.h>
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#include <linux/spinlock.h>
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MODULE_AUTHOR("Zhang Rui")
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MODULE_DESCRIPTION("Generic thermal management sysfs support");
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MODULE_LICENSE("GPL");
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#define PREFIX "Thermal: "
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struct thermal_cooling_device_instance {
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int id;
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char name[THERMAL_NAME_LENGTH];
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *cdev;
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int trip;
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char attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute attr;
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struct list_head node;
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};
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static DEFINE_IDR(thermal_tz_idr);
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static DEFINE_IDR(thermal_cdev_idr);
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static DEFINE_MUTEX(thermal_idr_lock);
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static LIST_HEAD(thermal_tz_list);
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static LIST_HEAD(thermal_cdev_list);
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static DEFINE_MUTEX(thermal_list_lock);
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static int get_idr(struct idr *idr, struct mutex *lock, int *id)
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{
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int err;
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again:
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if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
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return -ENOMEM;
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if (lock)
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mutex_lock(lock);
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err = idr_get_new(idr, NULL, id);
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if (lock)
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mutex_unlock(lock);
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if (unlikely(err == -EAGAIN))
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goto again;
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else if (unlikely(err))
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return err;
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*id = *id & MAX_ID_MASK;
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return 0;
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}
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static void release_idr(struct idr *idr, struct mutex *lock, int id)
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{
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if (lock)
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mutex_lock(lock);
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idr_remove(idr, id);
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if (lock)
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mutex_unlock(lock);
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}
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/* sys I/F for thermal zone */
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#define to_thermal_zone(_dev) \
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container_of(_dev, struct thermal_zone_device, device)
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static ssize_t
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type_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%s\n", tz->type);
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}
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static ssize_t
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temp_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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if (!tz->ops->get_temp)
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return -EPERM;
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return tz->ops->get_temp(tz, buf);
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}
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static ssize_t
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mode_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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if (!tz->ops->get_mode)
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return -EPERM;
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return tz->ops->get_mode(tz, buf);
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}
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static ssize_t
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mode_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int result;
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if (!tz->ops->set_mode)
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return -EPERM;
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result = tz->ops->set_mode(tz, buf);
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if (result)
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return result;
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return count;
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}
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static ssize_t
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trip_point_type_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip;
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if (!tz->ops->get_trip_type)
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return -EPERM;
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if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
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return -EINVAL;
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return tz->ops->get_trip_type(tz, trip, buf);
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}
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static ssize_t
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trip_point_temp_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip;
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if (!tz->ops->get_trip_temp)
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return -EPERM;
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if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
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return -EINVAL;
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return tz->ops->get_trip_temp(tz, trip, buf);
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}
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static DEVICE_ATTR(type, 0444, type_show, NULL);
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static DEVICE_ATTR(temp, 0444, temp_show, NULL);
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static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
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static struct device_attribute trip_point_attrs[] = {
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__ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
|
||||
__ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
|
||||
__ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
|
||||
__ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
|
||||
__ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
|
||||
__ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
|
||||
__ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
|
||||
__ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
|
||||
};
|
||||
|
||||
#define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
|
||||
do { \
|
||||
result = device_create_file(_dev, \
|
||||
&trip_point_attrs[_index * 2]); \
|
||||
if (result) \
|
||||
break; \
|
||||
result = device_create_file(_dev, \
|
||||
&trip_point_attrs[_index * 2 + 1]); \
|
||||
} while (0)
|
||||
|
||||
#define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
|
||||
do { \
|
||||
device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
|
||||
device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
|
||||
} while (0)
|
||||
|
||||
/* sys I/F for cooling device */
|
||||
#define to_cooling_device(_dev) \
|
||||
container_of(_dev, struct thermal_cooling_device, device)
|
||||
|
||||
static ssize_t
|
||||
thermal_cooling_device_type_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
||||
|
||||
return sprintf(buf, "%s\n", cdev->type);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
thermal_cooling_device_max_state_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
||||
|
||||
return cdev->ops->get_max_state(cdev, buf);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
thermal_cooling_device_cur_state_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
||||
|
||||
return cdev->ops->get_cur_state(cdev, buf);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
thermal_cooling_device_cur_state_store(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
||||
int state;
|
||||
int result;
|
||||
|
||||
if (!sscanf(buf, "%d\n", &state))
|
||||
return -EINVAL;
|
||||
|
||||
if (state < 0)
|
||||
return -EINVAL;
|
||||
|
||||
result = cdev->ops->set_cur_state(cdev, state);
|
||||
if (result)
|
||||
return result;
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct device_attribute dev_attr_cdev_type =
|
||||
__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
|
||||
static DEVICE_ATTR(max_state, 0444,
|
||||
thermal_cooling_device_max_state_show, NULL);
|
||||
static DEVICE_ATTR(cur_state, 0644,
|
||||
thermal_cooling_device_cur_state_show,
|
||||
thermal_cooling_device_cur_state_store);
|
||||
|
||||
static ssize_t
|
||||
thermal_cooling_device_trip_point_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct thermal_cooling_device_instance *instance;
|
||||
|
||||
instance =
|
||||
container_of(attr, struct thermal_cooling_device_instance, attr);
|
||||
|
||||
if (instance->trip == THERMAL_TRIPS_NONE)
|
||||
return sprintf(buf, "-1\n");
|
||||
else
|
||||
return sprintf(buf, "%d\n", instance->trip);
|
||||
}
|
||||
|
||||
/* Device management */
|
||||
|
||||
/**
|
||||
* thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
|
||||
* this function is usually called in the thermal zone device .bind callback.
|
||||
* @tz: thermal zone device
|
||||
* @trip: indicates which trip point the cooling devices is
|
||||
* associated with in this thermal zone.
|
||||
* @cdev: thermal cooling device
|
||||
*/
|
||||
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
|
||||
int trip,
|
||||
struct thermal_cooling_device *cdev)
|
||||
{
|
||||
struct thermal_cooling_device_instance *dev;
|
||||
struct thermal_cooling_device_instance *pos;
|
||||
int result;
|
||||
|
||||
if (trip >= tz->trips ||
|
||||
(trip < 0 && trip != THERMAL_TRIPS_NONE))
|
||||
return -EINVAL;
|
||||
|
||||
if (!tz || !cdev)
|
||||
return -EINVAL;
|
||||
|
||||
dev =
|
||||
kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
|
||||
if (!dev)
|
||||
return -ENOMEM;
|
||||
dev->tz = tz;
|
||||
dev->cdev = cdev;
|
||||
dev->trip = trip;
|
||||
result = get_idr(&tz->idr, &tz->lock, &dev->id);
|
||||
if (result)
|
||||
goto free_mem;
|
||||
|
||||
sprintf(dev->name, "cdev%d", dev->id);
|
||||
result =
|
||||
sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
|
||||
if (result)
|
||||
goto release_idr;
|
||||
|
||||
sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
|
||||
dev->attr.attr.name = dev->attr_name;
|
||||
dev->attr.attr.mode = 0444;
|
||||
dev->attr.show = thermal_cooling_device_trip_point_show;
|
||||
result = device_create_file(&tz->device, &dev->attr);
|
||||
if (result)
|
||||
goto remove_symbol_link;
|
||||
|
||||
mutex_lock(&tz->lock);
|
||||
list_for_each_entry(pos, &tz->cooling_devices, node)
|
||||
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
||||
result = -EEXIST;
|
||||
break;
|
||||
}
|
||||
if (!result)
|
||||
list_add_tail(&dev->node, &tz->cooling_devices);
|
||||
mutex_unlock(&tz->lock);
|
||||
|
||||
if (!result)
|
||||
return 0;
|
||||
|
||||
device_remove_file(&tz->device, &dev->attr);
|
||||
remove_symbol_link:
|
||||
sysfs_remove_link(&tz->device.kobj, dev->name);
|
||||
release_idr:
|
||||
release_idr(&tz->idr, &tz->lock, dev->id);
|
||||
free_mem:
|
||||
kfree(dev);
|
||||
return result;
|
||||
}
|
||||
EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
|
||||
|
||||
/**
|
||||
* thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
|
||||
* this function is usually called in the thermal zone device .unbind callback.
|
||||
* @tz: thermal zone device
|
||||
* @trip: indicates which trip point the cooling devices is
|
||||
* associated with in this thermal zone.
|
||||
* @cdev: thermal cooling device
|
||||
*/
|
||||
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
|
||||
int trip,
|
||||
struct thermal_cooling_device *cdev)
|
||||
{
|
||||
struct thermal_cooling_device_instance *pos, *next;
|
||||
|
||||
mutex_lock(&tz->lock);
|
||||
list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
|
||||
if (pos->tz == tz && pos->trip == trip
|
||||
&& pos->cdev == cdev) {
|
||||
list_del(&pos->node);
|
||||
mutex_unlock(&tz->lock);
|
||||
goto unbind;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&tz->lock);
|
||||
|
||||
return -ENODEV;
|
||||
|
||||
unbind:
|
||||
device_remove_file(&tz->device, &pos->attr);
|
||||
sysfs_remove_link(&tz->device.kobj, pos->name);
|
||||
release_idr(&tz->idr, &tz->lock, pos->id);
|
||||
kfree(pos);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
|
||||
|
||||
static void thermal_release(struct device *dev)
|
||||
{
|
||||
struct thermal_zone_device *tz;
|
||||
struct thermal_cooling_device *cdev;
|
||||
|
||||
if (!strncmp(dev->bus_id, "thermal_zone", sizeof "thermal_zone" - 1)) {
|
||||
tz = to_thermal_zone(dev);
|
||||
kfree(tz);
|
||||
} else {
|
||||
cdev = to_cooling_device(dev);
|
||||
kfree(cdev);
|
||||
}
|
||||
}
|
||||
|
||||
static struct class thermal_class = {
|
||||
.name = "thermal",
|
||||
.dev_release = thermal_release,
|
||||
};
|
||||
|
||||
/**
|
||||
* thermal_cooling_device_register - register a new thermal cooling device
|
||||
* @type: the thermal cooling device type.
|
||||
* @devdata: device private data.
|
||||
* @ops: standard thermal cooling devices callbacks.
|
||||
*/
|
||||
struct thermal_cooling_device *thermal_cooling_device_register(char *type,
|
||||
void *devdata, struct thermal_cooling_device_ops *ops)
|
||||
{
|
||||
struct thermal_cooling_device *cdev;
|
||||
struct thermal_zone_device *pos;
|
||||
int result;
|
||||
|
||||
if (strlen(type) >= THERMAL_NAME_LENGTH)
|
||||
return NULL;
|
||||
|
||||
if (!ops || !ops->get_max_state || !ops->get_cur_state ||
|
||||
!ops->set_cur_state)
|
||||
return NULL;
|
||||
|
||||
cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
|
||||
if (!cdev)
|
||||
return NULL;
|
||||
|
||||
result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
|
||||
if (result) {
|
||||
kfree(cdev);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
strcpy(cdev->type, type);
|
||||
cdev->ops = ops;
|
||||
cdev->device.class = &thermal_class;
|
||||
cdev->devdata = devdata;
|
||||
sprintf(cdev->device.bus_id, "cooling_device%d", cdev->id);
|
||||
result = device_register(&cdev->device);
|
||||
if (result) {
|
||||
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
||||
kfree(cdev);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* sys I/F */
|
||||
if (type) {
|
||||
result = device_create_file(&cdev->device,
|
||||
&dev_attr_cdev_type);
|
||||
if (result)
|
||||
goto unregister;
|
||||
}
|
||||
|
||||
result = device_create_file(&cdev->device, &dev_attr_max_state);
|
||||
if (result)
|
||||
goto unregister;
|
||||
|
||||
result = device_create_file(&cdev->device, &dev_attr_cur_state);
|
||||
if (result)
|
||||
goto unregister;
|
||||
|
||||
mutex_lock(&thermal_list_lock);
|
||||
list_add(&cdev->node, &thermal_cdev_list);
|
||||
list_for_each_entry(pos, &thermal_tz_list, node) {
|
||||
if (!pos->ops->bind)
|
||||
continue;
|
||||
result = pos->ops->bind(pos, cdev);
|
||||
if (result)
|
||||
break;
|
||||
|
||||
}
|
||||
mutex_unlock(&thermal_list_lock);
|
||||
|
||||
if (!result)
|
||||
return cdev;
|
||||
|
||||
unregister:
|
||||
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
||||
device_unregister(&cdev->device);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(thermal_cooling_device_register);
|
||||
|
||||
/**
|
||||
* thermal_cooling_device_unregister - removes the registered thermal cooling device
|
||||
*
|
||||
* @cdev: the thermal cooling device to remove.
|
||||
*
|
||||
* thermal_cooling_device_unregister() must be called when the device is no
|
||||
* longer needed.
|
||||
*/
|
||||
void thermal_cooling_device_unregister(struct
|
||||
thermal_cooling_device
|
||||
*cdev)
|
||||
{
|
||||
struct thermal_zone_device *tz;
|
||||
struct thermal_cooling_device *pos = NULL;
|
||||
|
||||
if (!cdev)
|
||||
return;
|
||||
|
||||
mutex_lock(&thermal_list_lock);
|
||||
list_for_each_entry(pos, &thermal_cdev_list, node)
|
||||
if (pos == cdev)
|
||||
break;
|
||||
if (pos != cdev) {
|
||||
/* thermal cooling device not found */
|
||||
mutex_unlock(&thermal_list_lock);
|
||||
return;
|
||||
}
|
||||
list_del(&cdev->node);
|
||||
list_for_each_entry(tz, &thermal_tz_list, node) {
|
||||
if (!tz->ops->unbind)
|
||||
continue;
|
||||
tz->ops->unbind(tz, cdev);
|
||||
}
|
||||
mutex_unlock(&thermal_list_lock);
|
||||
if (cdev->type[0])
|
||||
device_remove_file(&cdev->device,
|
||||
&dev_attr_cdev_type);
|
||||
device_remove_file(&cdev->device, &dev_attr_max_state);
|
||||
device_remove_file(&cdev->device, &dev_attr_cur_state);
|
||||
|
||||
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
||||
device_unregister(&cdev->device);
|
||||
return;
|
||||
}
|
||||
EXPORT_SYMBOL(thermal_cooling_device_unregister);
|
||||
|
||||
/**
|
||||
* thermal_zone_device_register - register a new thermal zone device
|
||||
* @type: the thermal zone device type
|
||||
* @trips: the number of trip points the thermal zone support
|
||||
* @devdata: private device data
|
||||
* @ops: standard thermal zone device callbacks
|
||||
*
|
||||
* thermal_zone_device_unregister() must be called when the device is no
|
||||
* longer needed.
|
||||
*/
|
||||
struct thermal_zone_device *thermal_zone_device_register(char *type,
|
||||
int trips, void *devdata,
|
||||
struct thermal_zone_device_ops *ops)
|
||||
{
|
||||
struct thermal_zone_device *tz;
|
||||
struct thermal_cooling_device *pos;
|
||||
int result;
|
||||
int count;
|
||||
|
||||
if (strlen(type) >= THERMAL_NAME_LENGTH)
|
||||
return NULL;
|
||||
|
||||
if (trips > THERMAL_MAX_TRIPS || trips < 0)
|
||||
return NULL;
|
||||
|
||||
if (!ops || !ops->get_temp)
|
||||
return NULL;
|
||||
|
||||
tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
|
||||
if (!tz)
|
||||
return NULL;
|
||||
|
||||
INIT_LIST_HEAD(&tz->cooling_devices);
|
||||
idr_init(&tz->idr);
|
||||
mutex_init(&tz->lock);
|
||||
result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
|
||||
if (result) {
|
||||
kfree(tz);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
strcpy(tz->type, type);
|
||||
tz->ops = ops;
|
||||
tz->device.class = &thermal_class;
|
||||
tz->devdata = devdata;
|
||||
tz->trips = trips;
|
||||
sprintf(tz->device.bus_id, "thermal_zone%d", tz->id);
|
||||
result = device_register(&tz->device);
|
||||
if (result) {
|
||||
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
|
||||
kfree(tz);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* sys I/F */
|
||||
if (type) {
|
||||
result = device_create_file(&tz->device, &dev_attr_type);
|
||||
if (result)
|
||||
goto unregister;
|
||||
}
|
||||
|
||||
result = device_create_file(&tz->device, &dev_attr_temp);
|
||||
if (result)
|
||||
goto unregister;
|
||||
|
||||
if (ops->get_mode) {
|
||||
result = device_create_file(&tz->device, &dev_attr_mode);
|
||||
if (result)
|
||||
goto unregister;
|
||||
}
|
||||
|
||||
for (count = 0; count < trips; count++) {
|
||||
TRIP_POINT_ATTR_ADD(&tz->device, count, result);
|
||||
if (result)
|
||||
goto unregister;
|
||||
}
|
||||
|
||||
mutex_lock(&thermal_list_lock);
|
||||
list_add_tail(&tz->node, &thermal_tz_list);
|
||||
if (ops->bind)
|
||||
list_for_each_entry(pos, &thermal_cdev_list, node) {
|
||||
result = ops->bind(tz, pos);
|
||||
if (result)
|
||||
break;
|
||||
}
|
||||
mutex_unlock(&thermal_list_lock);
|
||||
|
||||
if (!result)
|
||||
return tz;
|
||||
|
||||
unregister:
|
||||
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
|
||||
device_unregister(&tz->device);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(thermal_zone_device_register);
|
||||
|
||||
/**
|
||||
* thermal_device_unregister - removes the registered thermal zone device
|
||||
*
|
||||
* @tz: the thermal zone device to remove
|
||||
*/
|
||||
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
|
||||
{
|
||||
struct thermal_cooling_device *cdev;
|
||||
struct thermal_zone_device *pos = NULL;
|
||||
int count;
|
||||
|
||||
if (!tz)
|
||||
return;
|
||||
|
||||
mutex_lock(&thermal_list_lock);
|
||||
list_for_each_entry(pos, &thermal_tz_list, node)
|
||||
if (pos == tz)
|
||||
break;
|
||||
if (pos != tz) {
|
||||
/* thermal zone device not found */
|
||||
mutex_unlock(&thermal_list_lock);
|
||||
return;
|
||||
}
|
||||
list_del(&tz->node);
|
||||
if (tz->ops->unbind)
|
||||
list_for_each_entry(cdev, &thermal_cdev_list, node)
|
||||
tz->ops->unbind(tz, cdev);
|
||||
mutex_unlock(&thermal_list_lock);
|
||||
|
||||
if (tz->type[0])
|
||||
device_remove_file(&tz->device, &dev_attr_type);
|
||||
device_remove_file(&tz->device, &dev_attr_temp);
|
||||
if (tz->ops->get_mode)
|
||||
device_remove_file(&tz->device, &dev_attr_mode);
|
||||
|
||||
for (count = 0; count < tz->trips; count++)
|
||||
TRIP_POINT_ATTR_REMOVE(&tz->device, count);
|
||||
|
||||
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
|
||||
idr_destroy(&tz->idr);
|
||||
mutex_destroy(&tz->lock);
|
||||
device_unregister(&tz->device);
|
||||
return;
|
||||
}
|
||||
EXPORT_SYMBOL(thermal_zone_device_unregister);
|
||||
|
||||
static int __init thermal_init(void)
|
||||
{
|
||||
int result = 0;
|
||||
|
||||
result = class_register(&thermal_class);
|
||||
if (result) {
|
||||
idr_destroy(&thermal_tz_idr);
|
||||
idr_destroy(&thermal_cdev_idr);
|
||||
mutex_destroy(&thermal_idr_lock);
|
||||
mutex_destroy(&thermal_list_lock);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
static void __exit thermal_exit(void)
|
||||
{
|
||||
class_unregister(&thermal_class);
|
||||
idr_destroy(&thermal_tz_idr);
|
||||
idr_destroy(&thermal_cdev_idr);
|
||||
mutex_destroy(&thermal_idr_lock);
|
||||
mutex_destroy(&thermal_list_lock);
|
||||
}
|
||||
|
||||
subsys_initcall(thermal_init);
|
||||
module_exit(thermal_exit);
|
||||
|
|
@ -0,0 +1,90 @@
|
|||
/*
|
||||
* 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/idr.h>
|
||||
#include <linux/device.h>
|
||||
|
||||
struct thermal_zone_device;
|
||||
struct thermal_cooling_device;
|
||||
|
||||
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 *, char *);
|
||||
int (*get_mode) (struct thermal_zone_device *, char *);
|
||||
int (*set_mode) (struct thermal_zone_device *, const char *);
|
||||
int (*get_trip_type) (struct thermal_zone_device *, int, char *);
|
||||
int (*get_trip_temp) (struct thermal_zone_device *, int, char *);
|
||||
};
|
||||
|
||||
struct thermal_cooling_device_ops {
|
||||
int (*get_max_state) (struct thermal_cooling_device *, char *);
|
||||
int (*get_cur_state) (struct thermal_cooling_device *, char *);
|
||||
int (*set_cur_state) (struct thermal_cooling_device *, unsigned int);
|
||||
};
|
||||
|
||||
#define THERMAL_TRIPS_NONE -1
|
||||
#define THERMAL_MAX_TRIPS 10
|
||||
#define THERMAL_NAME_LENGTH 20
|
||||
struct thermal_cooling_device {
|
||||
int id;
|
||||
char type[THERMAL_NAME_LENGTH];
|
||||
struct device device;
|
||||
void *devdata;
|
||||
struct thermal_cooling_device_ops *ops;
|
||||
struct list_head node;
|
||||
};
|
||||
|
||||
struct thermal_zone_device {
|
||||
int id;
|
||||
char type[THERMAL_NAME_LENGTH];
|
||||
struct device device;
|
||||
void *devdata;
|
||||
int trips;
|
||||
struct thermal_zone_device_ops *ops;
|
||||
struct list_head cooling_devices;
|
||||
struct idr idr;
|
||||
struct mutex lock; /* protect cooling devices list */
|
||||
struct list_head node;
|
||||
};
|
||||
|
||||
struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
|
||||
struct thermal_zone_device_ops *);
|
||||
void thermal_zone_device_unregister(struct thermal_zone_device *);
|
||||
|
||||
int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
|
||||
struct thermal_cooling_device *);
|
||||
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
|
||||
struct thermal_cooling_device *);
|
||||
|
||||
struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
|
||||
struct thermal_cooling_device_ops *);
|
||||
void thermal_cooling_device_unregister(struct thermal_cooling_device *);
|
||||
|
||||
#endif /* __THERMAL_H__ */
|
||||
Loading…
Reference in New Issue