iio: trigger: allow immutable triggers to be assigned
There are times when an assigned trigger to a device shouldn't ever
change after intialization.
Examples of this being used is when an provider device has a trigger
that is assigned to an ADC, which uses it populate data into a callback
buffer.
Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 854e2da..786952c 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -483,6 +483,7 @@
* @scan_timestamp: [INTERN] set if any buffers have requested timestamp
* @scan_index_timestamp:[INTERN] cache of the index to the timestamp
* @trig: [INTERN] current device trigger (buffer modes)
+ * @trig_readonly [INTERN] mark the current trigger immutable
* @pollfunc: [DRIVER] function run on trigger being received
* @pollfunc_event: [DRIVER] function run on events trigger being received
* @channels: [DRIVER] channel specification structure table
@@ -523,6 +524,7 @@
bool scan_timestamp;
unsigned scan_index_timestamp;
struct iio_trigger *trig;
+ bool trig_readonly;
struct iio_poll_func *pollfunc;
struct iio_poll_func *pollfunc_event;
diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
index 1c9e028..a122bdd 100644
--- a/include/linux/iio/trigger.h
+++ b/include/linux/iio/trigger.h
@@ -132,6 +132,15 @@
void iio_trigger_unregister(struct iio_trigger *trig_info);
/**
+ * iio_trigger_set_immutable() - set an immutable trigger on destination
+ *
+ * @indio_dev - IIO device structure containing the device
+ * @trig - trigger to assign to device
+ *
+ **/
+int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);
+
+/**
* iio_trigger_poll() - called on a trigger occurring
* @trig: trigger which occurred
*