linux-kernel - Re: [PATCH v3] media: v4l2-ctrls: add control for test pattern

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Date:	Mon, 24 Sep 2012 15:37:17 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	davinci-linux-open-source@...ux.davincidsp.com
Cc:	Prabhakar <prabhakar.csengg@...il.com>,
	LMML <linux-media@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	LDOC <linux-doc@...r.kernel.org>,
	VGER <linux-kernel@...r.kernel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>
Subject: Re: [PATCH v3] media: v4l2-ctrls: add control for test pattern

On Mon September 24 2012 14:53:41 Prabhakar wrote:
> From: Lad, Prabhakar <prabhakar.lad@...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@...com>
> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
> Acked-by: Sakari Ailus <sakari.ailus@....fi>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Mauro Carvalho Chehab <mchehab@...radead.org>
> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Rob Landley <rob@...dley.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 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..51e9c4e 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"> The Capture/Display/Sensors have the capability
> +	    to generate internal test patterns and this are hardware specific. This
> +	    test patterns are used to test a device is properly working and can generate
> +	    the desired waveforms that it supports.</entry>

Some grammar/style fixes:

	    <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
> 

Regards,

	Hans
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