[media] v4l2-ctrls: Teach v4l2-ctrls that V4L2_CID_AUTOBRIGHTNESS is a boolean

And document V4L2_CID_AUTOBRIGHTNESS.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/media/v4l/controls.xml

@@ -372,6 +372,11 @@ minimum value disables backlight compensation.</entry>
 	    Cr component, bits [15:8] as Cb component and bits [31:16] must be zero.
 	  </entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_CID_AUTOBRIGHTNESS</constant></entry>
+	    <entry>boolean</entry>
+	    <entry>Enable Automatic Brightness.</entry>
+	  </row>
 	  <row>
 	    <entry><constant>V4L2_CID_ROTATE</constant></entry>
 	    <entry>integer</entry>

drivers/media/video/v4l2-ctrls.c

@@ -755,6 +755,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_HUE_AUTO:
 	case V4L2_CID_CHROMA_AGC:
 	case V4L2_CID_COLOR_KILLER:
+	case V4L2_CID_AUTOBRIGHTNESS:
 	case V4L2_CID_MPEG_AUDIO_MUTE:
 	case V4L2_CID_MPEG_VIDEO_MUTE:
 	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: