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iio: trigger: Add simple trigger_validation helper

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Some triggers can only be attached to the IIO device that corresponds to
the same physical device. Implement generic helper which can be used as
a validate_trigger callback for such devices.

Suggested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/51cd3e3e74a6addf8d333f4a109fb9c5a11086ee.1683541225.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matti Vaittinen 2023-05-08 13:31:17 +03:00 committed by Jonathan Cameron
parent 4bef3adbd4
commit 517985ebc5
2 changed files with 22 additions and 1 deletions
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22
drivers/iio/industrialio-trigger.c
View file

@ -322,7 +322,7 @@ int iio_trigger_attach_poll_func(struct iio_trigger *trig,
* this is the case if the IIO device and the trigger device share the
* same parent device.
*/
if (pf->indio_dev->dev.parent == trig->dev.parent)
if (iio_validate_own_trigger(pf->indio_dev, trig))
trig->attached_own_device = true;
return ret;
@ -728,6 +728,26 @@ bool iio_trigger_using_own(struct iio_dev *indio_dev)
}
EXPORT_SYMBOL(iio_trigger_using_own);
/**
* iio_validate_own_trigger - Check if a trigger and IIO device belong to
* the same device
* @idev: the IIO device to check
* @trig: the IIO trigger to check
*
* This function can be used as the validate_trigger 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_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig)
{
if (idev->dev.parent != trig->dev.parent)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(iio_validate_own_trigger);
/**
* iio_trigger_validate_own_device - Check if a trigger and IIO device belong to
* the same device

1
include/linux/iio/trigger.h
View file

@ -171,6 +171,7 @@ void iio_trigger_free(struct iio_trigger *trig);
*/
bool iio_trigger_using_own(struct iio_dev *indio_dev);
int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig);
int iio_trigger_validate_own_device(struct iio_trigger *trig,
struct iio_dev *indio_dev);