Re: [Linux-uvc-devel] V4L1 backwards compatibility

[Eduardo P. U. <edu...@uc...>]

I'm trying to make this driver work with applications like mplayer,
xawtv, vic, gnomemeeting but I can't get it working with any of these
applications.

I think the patch suggested by Mikael should be applied to support v4l1
only applications.

I'm attaching a patch that get some of the applications mentioned get
more ioctls working but still no luck.

Has anybody made this driver work with the mentioned applications?

I'm using a Logitech QuickCam Pro 5000

On 2006-02-06 22:59:08 +0100, Mikael Nilsson wrote:
> If I understand the kernel API correctly, something like this patch
> *should* bring V4L1 compatibility to the uvc driver. However, I don't
> get a picture in gnomemeeting (old version, not ekiga), and not in the
> proprietary app I talked about.
> 
> I suppose there might be a reson why this cannot work. Can anyone
> enlighten me?
> 
> Index: uvcvideo.c
> ===================================================================
> --- uvcvideo.c  (revision 17)
> +++ uvcvideo.c  (working copy)
> @@ -2139,7 +2139,8 @@
> 
>         default:
>                 uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
> -               return -ENOIOCTLCMD;
> +               return v4l_compat_translate_ioctl(inode,file,cmd,arg,
> +                                                 uvc_v4l2_do_ioctl);
>         }
> 
>         return 0;
> 
> lör 2006-02-04 klockan 23:23 +0100 skrev Mikael Nilsson:
> > lör 2006-02-04 klockan 23:05 +0100 skrev michel Xhaard:
> > > Mikael
> > > This driver design is v4l2 only . The v4L1 compat only works for old driver to 
> > > the new interface, but a young driver, like uvcvideo works directly on v4l2.
> > 
> > Hmmm? Are you sure? This is the text in v4l1-compat.c:
> > 
> >  *      Video for Linux Two
> >  *      Backward Compatibility Layer
> >  *
> >  *      Support subroutines for providing V4L2 drivers with backward
> >  *      compatibility with applications using the old API.
> >  *
> > 
> > I read this as support for *new* drivers and *old* applications, not the
> > other way around. But then again, I'm no expert...