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

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Message-ID: <20110812111112.722cce3a@lxorguk.ukuu.org.uk>
Date:	Fri, 12 Aug 2011 11:11:12 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Theodore Kilgore <kilgota@...ach.math.auburn.edu>,
	Alan Stern <stern@...land.harvard.edu>,
	Hans de Goede <hdegoede@...hat.com>,
	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

> 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().

How will you handle the permission model, what about devices where you
need the V4L2 controls to take the picture in the first place ?

It seems it should really be the same device and just a minor tweak to
the API. V4L2 already provides frame reading and mapping functionality
and the media layer provides post processing services which I could
conceive some setups needing to use.

gphoto would just open the v4l device ask for still image stuff and
discover it wasn't available.
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