1 files changed, 20 insertions, 0 deletions

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index c45bf40e080d..de68a59c7d84 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -169,6 +169,7 @@ struct v4l2_ctrl_ref {
   *		control is needed multiple times, so this is a simple
   *		optimization.
   * @buckets:	Buckets for the hashing. Allows for quick control lookup.
+  * @nr_of_refs: Total number of control references in the list.
   * @nr_of_buckets: Total number of buckets in the array.
   * @error:	The error code of the first failed control addition.
   */
@@ -178,6 +179,7 @@ struct v4l2_ctrl_handler {
 	struct list_head ctrl_refs;
 	struct v4l2_ctrl_ref *cached;
 	struct v4l2_ctrl_ref **buckets;
+	u16 nr_of_refs;
 	u16 nr_of_buckets;
 	int error;
 };
@@ -494,11 +496,29 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
   */
 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
 
+/* Internal helper functions that deal with control events. */
 void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
 		struct v4l2_ctrl_fh *ctrl_fh,
 		struct v4l2_event_subscription *sub);
 void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh);
 
+/** v4l2_ctrl_subscribe_fh() - Helper function that subscribes a control event.
+  * @fh:	The file handler that subscribed the control event.
+  * @sub:	The event to subscribe (type must be V4L2_EVENT_CTRL).
+  * @n:		How many events should be allocated? (Passed to v4l2_event_alloc).
+  *		Recommended to set to twice the number of controls plus whatever
+  *		is needed for other events. This function will set n to
+  *		max(n, 2 * fh->ctrl_handler->nr_of_refs).
+  *
+  * A helper function that initializes the fh for events, allocates the
+  * list of events and subscribes the control event.
+  *
+  * Typically called in the handler of VIDIOC_SUBSCRIBE_EVENT in the
+  * V4L2_EVENT_CTRL case.
+  */
+int v4l2_ctrl_subscribe_fh(struct v4l2_fh *fh,
+			struct v4l2_event_subscription *sub, unsigned n);
+
 /* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);