[PATCH v3 2/5] iio: trigger: Add simple trigger_validation helper

[Matti Vaittinen]

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@xxxxxxxxxx>
Signed-off-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx>

---
Revision history
v2: => v3:
 - Fix title (space after iio:)
v2: New patch
---
 drivers/iio/industrialio-trigger.c | 22 +++++++++++++++++++++-
 include/linux/iio/trigger.h        |  1 +
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index 784dc1e00310..c616297aa754 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -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
diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
index 51f52c5c6092..bce3b1788199 100644
--- a/include/linux/iio/trigger.h
+++ b/include/linux/iio/trigger.h
@@ -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);
 
-- 
2.40.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]

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