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iio: core: Implement devm_iio_device_{register,unregister} 

Add device managed devm_iio_device_{register,unregister}()
to automatically unregister IIO drivers thus leading to
simplified IIO driver code.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Sachin Kamat 2013-10-29 11:39:00 +00:00 committed by Jonathan Cameron
parent 2461fc9f3f
commit 8caa07c0e5
3 changed files with 64 additions and 0 deletions
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2
Documentation/driver-model/devres.txt
View File

@ -242,6 +242,8 @@ IIO
devm_iio_device_free()
devm_iio_trigger_alloc()
devm_iio_trigger_free()
devm_iio_device_register()
devm_iio_device_unregister()
IO region
devm_request_region()

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

@ -1161,6 +1161,65 @@ void iio_device_unregister(struct iio_dev *indio_dev)
mutex_unlock(&indio_dev->info_exist_lock);
}
EXPORT_SYMBOL(iio_device_unregister);
static void devm_iio_device_unreg(struct device *dev, void *res)
{
iio_device_unregister(*(struct iio_dev **)res);
}
/**
* devm_iio_device_register - Resource-managed iio_device_register()
* @dev: Device to allocate iio_dev for
* @indio_dev: Device structure filled by the device driver
*
* Managed iio_device_register. The IIO device registered with this
* function is automatically unregistered on driver detach. This function
* calls iio_device_register() internally. Refer to that function for more
* information.
*
* If an iio_dev registered with this function needs to be unregistered
* separately, devm_iio_device_unregister() must be used.
*
* RETURNS:
* 0 on success, negative error number on failure.
*/
int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev)
{
struct iio_dev **ptr;
int ret;
ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
*ptr = indio_dev;
ret = iio_device_register(indio_dev);
if (!ret)
devres_add(dev, ptr);
else
devres_free(ptr);
return ret;
}
EXPORT_SYMBOL_GPL(devm_iio_device_register);
/**
* devm_iio_device_unregister - Resource-managed iio_device_unregister()
* @dev: Device this iio_dev belongs to
* @indio_dev: the iio_dev associated with the device
*
* Unregister iio_dev registered with devm_iio_device_register().
*/
void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
{
int rc;
rc = devres_release(dev, devm_iio_device_unreg,
devm_iio_device_match, indio_dev);
WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
subsys_initcall(iio_init);
module_exit(iio_exit);

3
include/linux/iio/iio.h
View File

@ -510,6 +510,9 @@ int iio_device_register(struct iio_dev *indio_dev);
**/
void iio_device_unregister(struct iio_dev *indio_dev);
int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev);
void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev);
/**
* iio_push_event() - try to add event to the list for userspace reading
* @indio_dev: IIO device structure