[PATCH 0/2] V4L: add "function" sysfs attribute to v4l devices

[Kees Cook <kees@xxxxxxxxxxx>]

Hello!

Two patches follow, related to discussions[1][2] on the hotplug mailing
list, in an attempt to solve enumeration problems when multiple v4l
devices are present in a system and the resulting init order was not
guaranteed to be the same from boot-to-boot (video0 isn't always the
same device).  The goal is to create things like this with udev:
    pci-0000:01:06.0-video-mpeg-cap -> ../../video0
    pci-0000:01:07.0-video-yuv-cap -> ../../video1
    pci-0000:01:06.0-video-yuv-cap -> ../../video24

First patch is the sysfs infrastructure to support exporting a
"function" string.  This value is related to the existing "type" field,
but is singular in use and not designed for internal driver use, as
"type" seems to be.

Second patch is a first stab at providing "function" entries for
hardware I have access to.

Thanks,

-Kees

[1] http://marc.info/?t=118591155400012&r=1&w=2
[2] some recent discussion on the new hotplug list, but I can't find an
    archive link since it moved to vger...

-- 
Kees Cook                                            @outflux.net

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