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

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Message-ID: <Pine.LNX.4.44L0.1108091016380.1949-100000@iolanthe.rowland.org>
Date:	Tue, 9 Aug 2011 10:19:23 -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:

> I would really like to see the dual mode camera and TV tuner discussion
> separated. They are 2 different issues AFAIK.
> 
> 1) Dual mode cameras:
> 
> In the case of the dual mode camera we have 1 single device (both at
> the hardware level and at the logical block level), which can do 2 things,
> but not at the same time. It can stream live video data from a sensor,
> or it can retrieve earlier taken pictures from some picture memory.
> 
> Unfortunately even though these 2 functions live in a single logical block,
> historically we've developed 2 drivers for them. This leads to fighting
> over device ownership (surprise surprise), and to me the solution is
> very clear, 1 logical block == 1 driver.

According to Theodore, we have developed 5 drivers for them because the
stillcam modes in different devices use four different vendor-specific
drivers.  Does it really make sense to combine 5 drivers into one?  I 
think some sort of sharing protocol would work out better.

Alan Stern

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