linux-kernel - Re: USB mini-summit at LinuxCon Vancouver

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Date:	Wed, 10 Aug 2011 10:19:46 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Hans de Goede <hdegoede@...hat.com>
cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg KH <greg@...ah.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	<linux-usb@...r.kernel.org>, <linux-media@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<libusb-devel@...ts.sourceforge.net>,
	Alexander Graf <agraf@...e.de>,
	Gerd Hoffmann <kraxel@...hat.com>, <hector@...cansoft.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	<pbonzini@...hat.com>, Anthony Liguori <aliguori@...ibm.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Oliver Neukum <oliver@...kum.org>, Felipe Balbi <balbi@...com>,
	Clemens Ladisch <clemens@...isch.de>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Theodore Kilgore <kilgota@...ach.math.auburn.edu>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: USB mini-summit at LinuxCon Vancouver

On Tue, 9 Aug 2011, Hans de Goede wrote:

> Hi,
> 
> On 08/09/2011 04:19 PM, Alan Stern wrote:
> > On Tue, 9 Aug 2011, Hans de Goede wrote:
> > According to Theodore, we have developed 5 drivers for them because the
> > stillcam modes in different devices use four different vendor-specific
> > drivers.
> 
> Yes, but so the the webcam modes of the different devices, so for
> the 5 (not sure if that is the right number) dual-cam mode chipsets
> we support there will be 5 drivers, each supporting both the
> webcam and the access to pictures stored in memory of the chipset
> they support. So 5 chipsets -> 5 drivers each supporting 1 chipset,
> and both functions of the single logical device that chipset
> represents.
> 
> >  Does it really make sense to combine 5 drivers into one?
> 
> Right, that is not the plan. The plan is to simply stop having 2 drivers
> for 1 logical (and physical) block. So we go from 10 drivers, 5 stillcam
> + 5 webcam, to just 5 drivers. We will also likely be able to share
> code between the code for the 2 functionalities for things like generic
> set / get register functions, initialization, etc.

Okay, I didn't realize that the different cameras used different webcam 
drivers as well as different stillcam drivers.

As far as I can see, there's nothing to stop anybody from adding the 
stillcam functionality into the webcam drivers right now.  If some 
common code can be abstracted out into a shared source file, so much 
the better.

That would solve the problem, right?

Alan Stern

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