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

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Date:	Fri, 12 Aug 2011 09:16:00 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
CC:	Theodore Kilgore <kilgota@...ach.math.auburn.edu>,
	Alan Stern <stern@...land.harvard.edu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg KH <greg@...ah.com>, 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>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: USB mini-summit at LinuxCon Vancouver

Hi,

On 08/11/2011 10:32 PM, Mauro Carvalho Chehab wrote:

<snip stuff I agree with>

> instead of using the V4L2 device node to access the stored images, it probably makes
> more sense to use a separate device for that, that will handle a separate set of
> ioctl's, and just use read() to retrieve the image data, after selecting the desired
> image number, via ioctl().

I don't see a lot of added value in doing things this way. We can simply
have a set of new ioctls on the /dev/video# node for this and a new
V4L2_CAP_STILL_IMAGE to indicate the availability of these ioctls. This will keep
the driver a lot simpler then doing 2 separate device nodes for 1 device.

Regards,

Hans
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