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thermal: doc: Add details of thermal_zone_of_sensor_{register,unregister}

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Add details of the interface thermal_zone_of_sensor_register() and
thermal_zone_of_sensor_unregister() in the thermal/sysfs-api.txt.

The details describes the functionality and parameter which
are passed to these interfaces.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Laxman Dewangan 2016-03-09 18:40:05 +05:30 committed by Eduardo Valentin
parent 74e5053cd7
commit 3a7fd9c737
1 changed files with 45 additions and 0 deletions
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45
Documentation/thermal/sysfs-api.txt
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@ -72,6 +72,51 @@ temperature) and throttle appropriate devices.
It deletes the corresponding entry form /sys/class/thermal folder and
unbind all the thermal cooling devices it uses.
1.1.3 struct thermal_zone_device *thermal_zone_of_sensor_register(
struct device *dev, int sensor_id, void *data,
const struct thermal_zone_of_device_ops *ops)
This interface adds a new sensor to a DT thermal zone.
This function will search the list of thermal zones described in
device tree and look for the zone that refer to the sensor device
pointed by dev->of_node as temperature providers. For the zone
pointing to the sensor node, the sensor will be added to the DT
thermal zone device.
The parameters for this interface are:
dev: Device node of sensor containing valid node pointer in
dev->of_node.
sensor_id: a sensor identifier, in case the sensor IP has more
than one sensors
data: a private pointer (owned by the caller) that will be
passed back, when a temperature reading is needed.
ops: struct thermal_zone_of_device_ops *.
get_temp: a pointer to a function that reads the
sensor temperature. This is mandatory
callback provided by sensor driver.
get_trend: a pointer to a function that reads the
sensor temperature trend.
set_emul_temp: a pointer to a function that sets
sensor emulated temperature.
The thermal zone temperature is provided by the get_temp() function
pointer of thermal_zone_of_device_ops. When called, it will
have the private pointer @data back.
It returns error pointer if fails otherwise valid thermal zone device
handle. Caller should check the return handle with IS_ERR() for finding
whether success or not.
1.1.4 void thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tzd)
This interface unregisters a sensor from a DT thermal zone which was
successfully added by interface thermal_zone_of_sensor_register().
This function removes the sensor callbacks and private data from the
thermal zone device registered with thermal_zone_of_sensor_register()
interface. It will also silent the zone by remove the .get_temp() and
get_trend() thermal zone device callbacks.
1.2 thermal cooling device interface
1.2.1 struct thermal_cooling_device *thermal_cooling_device_register(char *name,
void *devdata, struct thermal_cooling_device_ops *)