1 files changed, 64 insertions, 1 deletions

diff --git a/include/media/v4l2-mc.h b/include/media/v4l2-mc.h
index 431380eb408b..5cbc20923faf 100644
--- a/include/media/v4l2-mc.h
+++ b/include/media/v4l2-mc.h
@@ -18,6 +18,7 @@
 #define _V4L2_MC_H
 
 #include <media/media-device.h>
+#include <media/v4l2-dev.h>
 
 /**
  * enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER
@@ -116,11 +117,73 @@ struct usb_device;
  */
 int v4l2_mc_create_media_graph(struct media_device *mdev);
 
+/**
+ * v4l_enable_media_source() -	Hold media source for exclusive use
+ *				if free
+ *
+ * @vdev - poniter to struct video_device
+ *
+ * This interface calls enable_source handler to determine if
+ * media source is free for use. The enable_source handler is
+ * responsible for checking is the media source is free and
+ * start a pipeline between the media source and the media
+ * entity associated with the video device. This interface
+ * should be called from v4l2-core and dvb-core interfaces
+ * that change the source configuration.
+ *
+ * Return: returns zero on success or a negative error code.
+ */
+int v4l_enable_media_source(struct video_device *vdev);
+
+/**
+ * v4l_disable_media_source() -	Release media source
+ *
+ * @vdev - poniter to struct video_device
+ *
+ * This interface calls disable_source handler to release
+ * the media source. The disable_source handler stops the
+ * active media pipeline between the media source and the
+ * media entity associated with the video device.
+ *
+ * Return: returns zero on success or a negative error code.
+ */
+void v4l_disable_media_source(struct video_device *vdev);
+
+/*
+ * v4l_vb2q_enable_media_tuner -  Hold media source for exclusive use
+ *				  if free.
+ * @q - pointer to struct vb2_queue
+ *
+ * Wrapper for v4l_enable_media_source(). This function should
+ * be called from v4l2-core to enable the media source with
+ * pointer to struct vb2_queue as the input argument. Some
+ * v4l2-core interfaces don't have access to video device and
+ * this interface finds the struct video_device for the q and
+ * calls v4l_enable_media_source().
+ */
+int v4l_vb2q_enable_media_source(struct vb2_queue *q);
+
 #else
+
 static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
 {
 	return 0;
 }
 
+static int v4l_enable_media_source(struct video_device *vdev)
+{
+	return 0;
+}
+
+static void v4l_disable_media_source(struct video_device *vdev)
+{
+	return;
+}
+
+static int v4l_vb2q_enable_media_source(struct vb2_queue *q)
+{
+	return 0;
+}
+
 #endif
-#endif
+#endif /* _V4L2_MC_H */