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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/