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authorLars-Peter Clausen <lars@metafoo.de>2016-09-23 17:19:41 +0200
committerJonathan Cameron <jic23@kernel.org>2016-09-27 20:32:55 +0100
commit43ece27e70b2c756e45306791955507f0533e248 (patch)
tree00290483da0ec9100df02fb4a65f04ea47170212 /drivers/iio/industrialio-trigger.c
parent38e442fc8ba11b32e57f4837e1aa695f3751b99c (diff)
downloadlinux-43ece27e70b2c756e45306791955507f0533e248.tar.gz
iio:trigger: Add helper function to verify that a trigger belongs to the same device
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>
Diffstat (limited to 'drivers/iio/industrialio-trigger.c')
-rw-r--r--drivers/iio/industrialio-trigger.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index e1e104845e38..978729f6d7c4 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -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++] =