linux-kernel - Re: [PATCH v5 10/10] [media] v4l: Forbid usage of V4L2_MBUS

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Date:	Mon, 10 Nov 2014 12:09:19 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org, Sakari Ailus <sakari.ailus@....fi>
CC:	linux-arm-kernel@...ts.infradead.org, linux-api@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH v5 10/10] [media] v4l: Forbid usage of V4L2_MBUS_FMT definitions
 inside the kernel

On 11/08/2014 04:47 PM, Boris Brezillon wrote:
> Place v4l2_mbus_pixelcode in a #ifndef __KERNEL__ section so that kernel
> users don't have access to these definitions.
> 
> We have to keep this definition for user-space users even though they're
> encouraged to move to the new media_bus_format enum.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> ---
>  include/uapi/linux/v4l2-mediabus.h | 45 ++++++++++++++++++++++++--------------
>  1 file changed, 28 insertions(+), 17 deletions(-)
> 
> diff --git a/include/uapi/linux/v4l2-mediabus.h b/include/uapi/linux/v4l2-mediabus.h
> index d712df8..5c9410d 100644
> --- a/include/uapi/linux/v4l2-mediabus.h
> +++ b/include/uapi/linux/v4l2-mediabus.h
> @@ -15,6 +15,33 @@
>  #include <linux/types.h>
>  #include <linux/videodev2.h>
>  
> +/**
> + * struct v4l2_mbus_framefmt - frame format on the media bus
> + * @width:	frame width
> + * @height:	frame height
> + * @code:	data format code (from enum v4l2_mbus_pixelcode)
> + * @field:	used interlacing type (from enum v4l2_field)
> + * @colorspace:	colorspace of the data (from enum v4l2_colorspace)
> + */
> +struct v4l2_mbus_framefmt {
> +	__u32			width;
> +	__u32			height;
> +	__u32			code;
> +	__u32			field;
> +	__u32			colorspace;
> +	__u32			reserved[7];
> +};
> +
> +#ifndef __KERNEL__
> +/*
> + * enum v4l2_mbus_pixelcode and its definitions are now deprecated, and
> + * MEDIA_BUS_FMT_ definitions (defined in media-bus-format.h) should be
> + * used instead.
> + *
> + * New defines should only be added to media-bus-format.h. The
> + * v4l2_mbus_pixelcode enum is frozen.
> + */
> +
>  #define V4L2_MBUS_FROM_MEDIA_BUS_FMT(name)	\
>  	MEDIA_BUS_FMT_ ## name = V4L2_MBUS_FMT_ ## name

Shouldn't this be the other way around?

  	V4L2_MBUS_FMT_ ## name = MEDIA_BUS_FMT_ ## name

Regards,

	Hans

>  
> @@ -102,22 +129,6 @@ enum v4l2_mbus_pixelcode {
>  
>  	V4L2_MBUS_FROM_MEDIA_BUS_FMT(AHSV8888_1X32),
>  };
> -
> -/**
> - * struct v4l2_mbus_framefmt - frame format on the media bus
> - * @width:	frame width
> - * @height:	frame height
> - * @code:	data format code (from enum v4l2_mbus_pixelcode)
> - * @field:	used interlacing type (from enum v4l2_field)
> - * @colorspace:	colorspace of the data (from enum v4l2_colorspace)
> - */
> -struct v4l2_mbus_framefmt {
> -	__u32			width;
> -	__u32			height;
> -	__u32			code;
> -	__u32			field;
> -	__u32			colorspace;
> -	__u32			reserved[7];
> -};
> +#endif /* __KERNEL__ */
>  
>  #endif
> 

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