linux-kernel - Re: [v4l-dvb-maintainer] Re: [PATCH] V4L: struct video

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Date:	Fri, 21 Jul 2006 15:55:41 -0700 (PDT)
From:	Trent Piepho <xyzzy@...akeasy.org>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
cc:	v4l-dvb maintainer list <v4l-dvb-maintainer@...uxtv.org>,
	Linux and Kernel Video <video4linux-list@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [v4l-dvb-maintainer] Re: [PATCH] V4L: struct video_device
 corruption

On Fri, 21 Jul 2006, Mauro Carvalho Chehab wrote:
> config VIDEO_BT848
>         tristate "BT848 Video For Linux"
>         depends on VIDEO_DEV && PCI && I2C && VIDEO_V4L2
>
> Argh! it should be V4L1 instead!

You can compile and use bt848 without V4L1 turned on.  It still has some
V4L1 functions defined.

> > All these files include v4l2-dev.h and have HAVE_V4L1 defined when V4L1 is
> > not turned on in Kconfig.  There files are all buildable when V4L1 is off;
> > they don't depend on it in Kconfig.
> Some of the above drivers are V4L2, like tda9887, tuner-core,
> tuner-simple, msp3400, cs53l32a, tveeprom, wm87xx. Maybe they are just
> including the wrong headers. We should try to change to videodev2.h and
> see what happens with all those drivers. The ones that break should me
> marked with the proper requirement on Kconfig.
>
> Some of they need some #ifdef inside. For example, compat_ioctl32 should
> handle both APIs, since it is a generic code to fix 32 bit calls to 64
> bit kernel.

I think this is pretty much what I've been saying.  Drivers should:
A. Not include videodev.h, but use videodev2.h
B. Include videodev.h, but be marked V4L1 in Kconfig
C. #ifdef around videodev.h (and code that needs videodev.h), so it
   is not included or needed when V4L1 is turned off.
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