1 files changed, 40 insertions, 3 deletions

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 776605f1cbe..801adb466bd 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -384,14 +384,28 @@ struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
   * @hdl:	The control handler.
   * @add:	The control handler whose controls you want to add to
   *		the @hdl control handler.
+  * @filter:	This function will filter which controls should be added.
   *
-  * Does nothing if either of the two is a NULL pointer.
+  * Does nothing if either of the two handlers is a NULL pointer.
+  * If @filter is NULL, then all controls are added. Otherwise only those
+  * controls for which @filter returns true will be added.
   * In case of an error @hdl->error will be set to the error code (if it
   * wasn't set already).
   */
 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
-			  struct v4l2_ctrl_handler *add);
+			  struct v4l2_ctrl_handler *add,
+			  bool (*filter)(const struct v4l2_ctrl *ctrl));
 
+/** v4l2_ctrl_radio_filter() - Standard filter for radio controls.
+  * @ctrl:	The control that is filtered.
+  *
+  * This will return true for any controls that are valid for radio device
+  * nodes. Those are all of the V4L2_CID_AUDIO_* user controls and all FM
+  * transmitter class controls.
+  *
+  * This function is to be used with v4l2_ctrl_add_handler().
+  */
+bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl);
 
 /** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster.
   * @ncontrols:	The number of controls in this cluster.
@@ -511,6 +525,29 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
   */
 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
 
+/** v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value from within a driver.
+  * @ctrl:	The control.
+  *
+  * This returns the control's value safely by going through the control
+  * framework. This function will lock the control's handler, so it cannot be
+  * used from within the &v4l2_ctrl_ops functions.
+  *
+  * This function is for 64-bit integer type controls only.
+  */
+s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
+
+/** v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value from within a driver.
+  * @ctrl:	The control.
+  * @val:	The new value.
+  *
+  * This set the control's new value safely by going through the control
+  * framework. This function will lock the control's handler, so it cannot be
+  * used from within the &v4l2_ctrl_ops functions.
+  *
+  * This function is for 64-bit integer type controls only.
+  */
+int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
+
 /* Internal helper functions that deal with control events. */
 extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;
 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new);
@@ -523,7 +560,7 @@ int v4l2_ctrl_log_status(struct file *file, void *fh);
 /* Can be used as a vidioc_subscribe_event function that just subscribes
    control events. */
 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
-				struct v4l2_event_subscription *sub);
+				const struct v4l2_event_subscription *sub);
 
 /* Can be used as a poll function that just polls for control events. */
 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);