From: David Brownell <david-b@pacbell.net>
To: Janne Grunau <j@jannau.net>
Cc: Hans de Goede <hdegoede@redhat.com>,
Hans Verkuil <hverkuil@xs4all.nl>,
Laurent Pinchart <laurent.pinchart@skynet.be>,
linux-media@vger.kernel.org,
Ricardo Jorge da Fonseca Marques Ferreira <storm@sys49152.net>,
linux-usb@vger.kernel.org
Subject: Re: v4l parent for usb device interface or device?
Date: Thu, 26 Mar 2009 18:31:55 -0700 [thread overview]
Message-ID: <200903261831.55746.david-b@pacbell.net> (raw)
In-Reply-To: <20090327005124.GD2349@aniel>
On Thursday 26 March 2009, Janne Grunau wrote:
>
> While I generally agree that setting parent to the usb interface is
> probably correct for multifunction devices
Make that "all" devices. :)
> I noticed a problem after
> changing the hdpvr driver accordingly.
>
> With parent set to the usb interface there is no longer easy access to
> the usb device properties like the serial number through sysfs. I know
> that a couple of user with more than one device use the serial number
> to set static device nodes through udev.
The serial number is still available, but it's coupled to the USB
device not its interface. Make your udev script hop up a level or
two in the driver model tree, as appropriate.
next prev parent reply other threads:[~2009-03-27 1:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-25 14:58 v4l parent for usb device interface or device? Hans Verkuil
2009-03-26 12:29 ` Hans de Goede
2009-03-26 18:14 ` Theodore Kilgore
2009-03-27 0:51 ` Janne Grunau
2009-03-27 1:31 ` David Brownell [this message]
2009-03-27 20:59 ` Janne Grunau
-- strict thread matches above, loose matches on Subject: below --
2009-03-25 10:18 Hans de Goede
2009-03-25 14:51 ` Laurent Pinchart
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