[media] em28xx: add media controller support

Add the needed bits to make em28xx to create a media
controller graph.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/em28xx/em28xx.h

@@ -26,7 +26,7 @@
 #ifndef _EM28XX_H
 #define _EM28XX_H
 
-#define EM28XX_VERSION "0.2.1"
+#define EM28XX_VERSION "0.2.2"
 #define DRIVER_DESC    "Empia em28xx device driver"
 
 #include <linux/workqueue.h>
@@ -552,6 +552,11 @@ struct em28xx_v4l2 {
 	bool top_field;
 	int vbi_read;
 	unsigned int field_count;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+	struct media_pad video_pad, vbi_pad;
+	struct media_entity *decoder;
+#endif
 };
 
 struct em28xx_audio {
@@ -712,6 +717,12 @@ struct em28xx {
 	/* Snapshot button input device */
 	char snapshot_button_path[30];	/* path of the input dev */
 	struct input_dev *sbutton_input_dev;
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+	struct media_device *media_dev;
+	struct media_entity input_ent[MAX_EM28XX_INPUT];
+	struct media_pad input_pad[MAX_EM28XX_INPUT];
+#endif
 };
 
 #define kref_to_dev(d) container_of(d, struct em28xx, ref)