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iio:trigger: add resource managed (un)register

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Add resource managed devm_iio_trigger_register() and
devm_iio_triger_unregister() to automatically clean up registered triggers
allocated by IIO drivers, thus leading to simplified IIO drivers code.

Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Gregor Boirie 2016-09-02 20:47:54 +02:00 committed by Jonathan Cameron
parent 2535cc7ae0
commit 9083325f11
3 changed files with 67 additions and 0 deletions
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2
Documentation/driver-model/devres.txt
View File

@ -268,6 +268,8 @@ IIO
devm_iio_kfifo_free()
devm_iio_trigger_alloc()
devm_iio_trigger_free()
devm_iio_trigger_register()
devm_iio_trigger_unregister()
devm_iio_channel_get()
devm_iio_channel_release()
devm_iio_channel_get_all()

59
drivers/iio/industrialio-trigger.c
View File

@ -642,6 +642,65 @@ void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig)
}
EXPORT_SYMBOL_GPL(devm_iio_trigger_free);
static void devm_iio_trigger_unreg(struct device *dev, void *res)
{
iio_trigger_unregister(*(struct iio_trigger **)res);
}
/**
* devm_iio_trigger_register - Resource-managed iio_trigger_register()
* @dev: device this trigger was allocated for
* @trig_info: trigger to register
*
* Managed iio_trigger_register(). The IIO trigger registered with this
* function is automatically unregistered on driver detach. This function
* calls iio_trigger_register() internally. Refer to that function for more
* information.
*
* If an iio_trigger registered with this function needs to be unregistered
* separately, devm_iio_trigger_unregister() must be used.
*
* RETURNS:
* 0 on success, negative error number on failure.
*/
int devm_iio_trigger_register(struct device *dev, struct iio_trigger *trig_info)
{
struct iio_trigger **ptr;
int ret;
ptr = devres_alloc(devm_iio_trigger_unreg, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
*ptr = trig_info;
ret = iio_trigger_register(trig_info);
if (!ret)
devres_add(dev, ptr);
else
devres_free(ptr);
return ret;
}
EXPORT_SYMBOL_GPL(devm_iio_trigger_register);
/**
* devm_iio_trigger_unregister - Resource-managed iio_trigger_unregister()
* @dev: device this iio_trigger belongs to
* @trig_info: the trigger associated with the device
*
* Unregister trigger registered with devm_iio_trigger_register().
*/
void devm_iio_trigger_unregister(struct device *dev,
struct iio_trigger *trig_info)
{
int rc;
rc = devres_release(dev, devm_iio_trigger_unreg, devm_iio_trigger_match,
trig_info);
WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_iio_trigger_unregister);
void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
{
indio_dev->groups[indio_dev->groupcounter++] =

6
include/linux/iio/trigger.h
View File

@ -125,12 +125,18 @@ static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig)
**/
int iio_trigger_register(struct iio_trigger *trig_info);
int devm_iio_trigger_register(struct device *dev,
struct iio_trigger *trig_info);
/**
* iio_trigger_unregister() - unregister a trigger from the core
* @trig_info: trigger to be unregistered
**/
void iio_trigger_unregister(struct iio_trigger *trig_info);
void devm_iio_trigger_unregister(struct device *dev,
struct iio_trigger *trig_info);
/**
* iio_trigger_set_immutable() - set an immutable trigger on destination
*