[PATCH v4] media: v4l2-ctrls: add control for test pattern

[Prabhakar <prabhakar.csengg@gmail.com>]

From: Lad, Prabhakar <prabhakar.lad@ti.com>

add V4L2_CID_TEST_PATTERN of type menu, which determines
the internal test pattern selected by the device.

Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Rob Landley <rob@landley.net>
---
 This patches has one checkpatch warning for line over
 80 characters altough it can be avoided I have kept it
 for consistency.

 Changes for v4:
 1: Fixed some grammar/style issues, pointed by Hans.

 Changes for v3:
 1: Removed the menu for test pattern, pointed by Sakari.

 Changes for v2:
 1: Included display devices in the description for test pattern
   as pointed by Hans.
 2: In the menu replaced 'Test Pattern Disabled' by 'Disabled' as
   pointed by Sylwester.
 3: Removed the test patterns from menu as the are hardware specific
   as pointed by Sakari.

 Documentation/DocBook/media/v4l/controls.xml |   10 ++++++++++
 drivers/media/v4l2-core/v4l2-ctrls.c         |    2 ++
 include/linux/videodev2.h                    |    1 +
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index f0fb08d..5450d31 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -4313,6 +4313,16 @@ interface and may change in the future.</para>
 	      </tbody>
 	    </entrytbl>
 	  </row>
+	  <row>
+	    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN</constant></entry>
+	    <entry>menu</entry>
+	  </row>
+	  <row id="v4l2-test-pattern">
+	    <entry spanname="descr"> Some capture/display/sensor devices have
+	    the capability to generate test pattern images. These hardware
+	    specific test patterns can be used to test if a device is working
+	    properly.</entry>
+	  </row>
 	<row><entry></entry></row>
 	</tbody>
       </tgroup>
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 8f2f40b..41b7732 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -740,6 +740,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_LINK_FREQ:		return "Link Frequency";
 	case V4L2_CID_PIXEL_RATE:		return "Pixel Rate";
 	case V4L2_CID_DPCM_PREDICTOR:		return "DPCM Predictor";
+	case V4L2_CID_TEST_PATTERN:		return "Test Pattern";
 
 	default:
 		return NULL;
@@ -841,6 +842,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_EXPOSURE_METERING:
 	case V4L2_CID_SCENE_MODE:
 	case V4L2_CID_DPCM_PREDICTOR:
+	case V4L2_CID_TEST_PATTERN:
 		*type = V4L2_CTRL_TYPE_MENU;
 		break;
 	case V4L2_CID_LINK_FREQ:
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index ca9fb78..7014c0b 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -2005,6 +2005,7 @@ enum v4l2_dpcm_predictor {
 	V4L2_DPCM_PREDICTOR_SIMPLE	= 0,
 	V4L2_DPCM_PREDICTOR_ADVANCED	= 1,
 };
+#define V4L2_CID_TEST_PATTERN			(V4L2_CID_IMAGE_PROC_CLASS_BASE + 4)
 
 /*
  *	T U N I N G
-- 
1.7.4.1