[media] cx25821: switch to v4l2_fh, add event and prio handling

It is now possible to remove cx25821_fh and replace it with v4l2_fh,
which in turn makes event handling and core prio handling possible.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/pci/cx25821/cx25821-video.h

@@ -39,6 +39,7 @@
 #include "cx25821.h"
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
+#include <media/v4l2-event.h>
 
 #define VIDEO_DEBUG 0
 

drivers/media/pci/cx25821/cx25821.h

@@ -116,15 +116,6 @@ struct cx25821_tvnorm {
 	u32 cxoformat;
 };
 
-struct cx25821_fh {
-	struct cx25821_dev *dev;
-
-	enum v4l2_priority prio;
-
-	/* video capture */
-	int channel_id;
-};
-
 enum cx25821_itype {
 	CX25821_VMUX_COMPOSITE = 1,
 	CX25821_VMUX_SVIDEO,
@@ -207,8 +198,7 @@ struct cx25821_dev;
 struct cx25821_channel {
 	unsigned id;
 	struct cx25821_dev *dev;
-	struct cx25821_fh *streaming_fh;
-	struct v4l2_prio_state prio;
+	struct v4l2_fh *streaming_fh;
 
 	struct v4l2_ctrl_handler hdl;
 	struct cx25821_data timeout_data;
@@ -360,7 +350,6 @@ struct cx25821_dev {
 	int pixel_format;
 	int channel_select;
 	int command;
-	int channel_opened;
 };
 
 struct upstream_user_struct {