V4L/DVB: v4l2: Add illuminator controls

Some media devices (microscopes) may have one or many illuminators.
This patch makes them controlable by the applications.

Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/v4l/controls.xml

@@ -311,11 +311,18 @@ minimum value disables backlight compensation.</entry>
 	    bits 8-15 Green color information, bits 16-23 Blue color
 	    information and bits 24-31 must be zero.</entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_CID_ILLUMINATORS_1</constant>
+		<constant>V4L2_CID_ILLUMINATORS_2</constant></entry>
+	    <entry>boolean</entry>
+	    <entry>Switch on or off the illuminator 1 or 2 of the device
+		(usually a microscope).</entry>
+	  </row>
 	  <row>
 	    <entry><constant>V4L2_CID_LASTP1</constant></entry>
 	    <entry></entry>
 	    <entry>End of the predefined control IDs (currently
-<constant>V4L2_CID_BG_COLOR</constant> + 1).</entry>
+<constant>V4L2_CID_ILLUMINATORS_2</constant> + 1).</entry>
 	  </row>
 	  <row>
 	    <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry>

drivers/media/video/v4l2-ctrls.c

@@ -305,6 +305,8 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_ROTATE:			return "Rotate";
 	case V4L2_CID_BG_COLOR:			return "Background Color";
 	case V4L2_CID_CHROMA_GAIN:		return "Chroma Gain";
+	case V4L2_CID_ILLUMINATORS_1:		return "Illuminator 1";
+	case V4L2_CID_ILLUMINATORS_2:		return "Illuminator 2";
 
 	/* MPEG controls */
 	/* Keep the order of the 'case's the same as in videodev2.h! */
@@ -419,6 +421,8 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_AUDIO_LIMITER_ENABLED:
 	case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
 	case V4L2_CID_PILOT_TONE_ENABLED:
+	case V4L2_CID_ILLUMINATORS_1:
+	case V4L2_CID_ILLUMINATORS_2:
 		*type = V4L2_CTRL_TYPE_BOOLEAN;
 		*min = 0;
 		*max = *step = 1;

include/linux/videodev2.h

@@ -1047,8 +1047,11 @@ enum v4l2_colorfx {
 
 #define V4L2_CID_CHROMA_GAIN                    (V4L2_CID_BASE+36)
 
+#define V4L2_CID_ILLUMINATORS_1			(V4L2_CID_BASE+37)
+#define V4L2_CID_ILLUMINATORS_2			(V4L2_CID_BASE+38)
+
 /* last CID + 1 */
-#define V4L2_CID_LASTP1                         (V4L2_CID_BASE+37)
+#define V4L2_CID_LASTP1                         (V4L2_CID_BASE+39)
 
 /*  MPEG-class control IDs defined by V4L2 */
 #define V4L2_CID_MPEG_BASE 			(V4L2_CTRL_CLASS_MPEG | 0x900)