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iio:trigger: Add helper function to verify that a trigger belongs to the same device

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Some triggers can only be attached to the IIO device that corresponds to
the same physical device. Currently each driver that requires this
implements its own trigger validation function.

Introduce a new helper function called iio_trigger_validate_own_device()
that can be used to do this check. Having a common implementation avoids
code duplication and unnecessary boiler-plate code.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2016-09-23 17:19:41 +02:00 committed by Jonathan Cameron
parent 38e442fc8b
commit 43ece27e70
2 changed files with 23 additions and 0 deletions
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21
drivers/iio/industrialio-trigger.c
View File

@ -717,6 +717,27 @@ bool iio_trigger_using_own(struct iio_dev *indio_dev)
}
EXPORT_SYMBOL(iio_trigger_using_own);
/**
* iio_trigger_validate_own_device - Check if a trigger and IIO device belong to
* the same device
* @trig: The IIO trigger to check
* @indio_dev: the IIO device to check
*
* This function can be used as the validate_device callback for triggers that
* can only be attached to their own device.
*
* Return: 0 if both the trigger and the IIO device belong to the same
* device, -EINVAL otherwise.
*/
int iio_trigger_validate_own_device(struct iio_trigger *trig,
struct iio_dev *indio_dev)
{
if (indio_dev->dev.parent != trig->dev.parent)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL(iio_trigger_validate_own_device);
void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
{
indio_dev->groups[indio_dev->groupcounter++] =

2
include/linux/iio/trigger.h
View File

@ -170,6 +170,8 @@ void iio_trigger_free(struct iio_trigger *trig);
*/
bool iio_trigger_using_own(struct iio_dev *indio_dev);
int iio_trigger_validate_own_device(struct iio_trigger *trig,
struct iio_dev *indio_dev);
#else
struct iio_trigger;