Date: Wed, 13 Aug 2003 09:56:35 -0700 From: John-Mark Gurney <gurney_j@efn.org> To: ticso@cicely.de Cc: hackers@freebsd.org Subject: Re: porting a webcam Message-ID: <20030813165635.GO10708@funkthat.com> In-Reply-To: <20030808160606.GA46866@cicely12.cicely.de> References: <20030808145626.80036.qmail@web14914.mail.yahoo.com> <20030808160606.GA46866@cicely12.cicely.de>
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Bernd Walter wrote this message on Fri, Aug 08, 2003 at 18:06 +0200:
> On Fri, Aug 08, 2003 at 07:56:26AM -0700, Paulo Roberto wrote:
> > * You guys think it is too difficult and I should just give up due to
> > my lack of experience? And if I manage to code properly, is it too
> > bureaucratic to get it into the FreeBSD kernel?
>
> I wouldn't write a kernel driver for a camera and use ugen(4) instead.
> The state of ugen is similar in 4.x and 5.x so you don't have to worry
> about a special version.
> The most important part is getting informations about the protocol
> used by your camera.
I second this. Another feature of using the ugen userland interface is
that you will get portability to Net/Open for free, and you won't have
to rewrite for -stable/-current either.
I believe that isochornous transfers do not work on -stable currently.
Now that PAE has been back ported to -stable, I will be working on
back porting the usb and busdma changes to -stable. This would also
include the isochornous support fixes. (btw, isochronous support was
working in 4.5-stable)
I have started work on defining a new multimedia interface, but I would
go ahead and write your driver and not wait for this. I'm a bit busy,
and haven't worked on it recently.
Another advantage of doing a userland program is that you can make a
simple port out of it, and don't have to work to get it into the kernel.
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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