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thermal: of-thermal: Add devm version of thermal_zone_of_sensor_register

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Add resource managed version of thermal_zone_of_sensor_register() and
thermal_zone_of_sensor_unregister().

This helps in reducing the code size in error path, remove of
driver remove callbacks and making proper sequence for deallocations.

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 18:40:06 +05:30 committed by Eduardo Valentin
parent 3a7fd9c737
commit e498b4984d
2 changed files with 99 additions and 0 deletions
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81
drivers/thermal/of-thermal.c
View file

@ -555,6 +555,87 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
}
EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
{
thermal_zone_of_sensor_unregister(dev,
*(struct thermal_zone_device **)res);
}
static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
void *data)
{
struct thermal_zone_device **r = res;
if (WARN_ON(!r || !*r))
return 0;
return *r == data;
}
/**
* devm_thermal_zone_of_sensor_register - Resource managed version of
* thermal_zone_of_sensor_register()
* @dev: a valid struct device pointer of a sensor device. Must contain
* a valid .of_node, for the sensor 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 *. Must contain at least .get_temp.
*
* Refer thermal_zone_of_sensor_register() for more details.
*
* Return: On success returns a valid struct thermal_zone_device,
* otherwise, it returns a corresponding ERR_PTR(). Caller must
* check the return value with help of IS_ERR() helper.
* Registered hermal_zone_device device will automatically be
* released when device is unbounded.
*/
struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
struct device *dev, int sensor_id,
void *data, const struct thermal_zone_of_device_ops *ops)
{
struct thermal_zone_device **ptr, *tzd;
ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
if (IS_ERR(tzd)) {
devres_free(ptr);
return tzd;
}
*ptr = tzd;
devres_add(dev, ptr);
return tzd;
}
EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
/**
* devm_thermal_zone_of_sensor_unregister - Resource managed version of
* thermal_zone_of_sensor_unregister().
* @dev: Device for which which resource was allocated.
* @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
*
* This function removes the sensor callbacks and private data from the
* thermal zone device registered with devm_thermal_zone_of_sensor_register()
* API. It will also silent the zone by remove the .get_temp() and .get_trend()
* thermal zone device callbacks.
* Normally this function will not need to be called and the resource
* management code will ensure that the resource is freed.
*/
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tzd)
{
WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
devm_thermal_zone_of_sensor_match, tzd));
}
EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
/*** functions parsing device tree nodes ***/
/**

18
include/linux/thermal.h
View file

@ -362,6 +362,11 @@ thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops);
void thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops);
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
#else
static inline struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
@ -376,6 +381,19 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
{
}
static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops)
{
return ERR_PTR(-ENODEV);
}
static inline
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz)
{
}
#endif
#if IS_ENABLED(CONFIG_THERMAL)