iio: trigger: Add filter callback

[deliverable/linux.git] / drivers / staging / iio / iio.h

diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h
index 78a0927c9fdfc421ff0e955393b73ffb0b9e9604..6e51baaaa7544762bb409c71c58b0dfce150d216 100644 (file)
--- a/drivers/staging/iio/iio.h
+++ b/drivers/staging/iio/iio.h
@@ -204,6 +204,8 @@ static inline s64 iio_get_time_ns(void)
 #define IIO_VAL_INT_PLUS_MICRO 2
 #define IIO_VAL_INT_PLUS_NANO 3
 
+struct iio_trigger; /* forward declaration */
+
 /**
  * struct iio_info - constant information about device
  * @driver_module:     module structure used to ensure correct
@@ -224,6 +226,8 @@ static inline s64 iio_get_time_ns(void)
  *                     is event dependant. event_code specifies which event.
  * @write_event_value: write the value associate with the event.
  *                     Meaning is event dependent.
+ * @validate_trigger:  function to validate the trigger when the
+ *                     current trigger gets changed.
  **/
 struct iio_info {
        struct module                   *driver_module;
@@ -256,6 +260,9 @@ struct iio_info {
        int (*write_event_value)(struct iio_dev *indio_dev,
                                 int event_code,
                                 int val);
+       int (*validate_trigger)(struct iio_dev *indio_dev,
+                               struct iio_trigger *trig);
+
 };
 
 /**