Re: udev rule for a 1394 port on a video card?

[Kay Sievers <kay.sievers@vrfy.org>]

On Mon, 2006-05-22 at 14:11 -0400, sean darcy wrote:
> On 5/22/06, Kay Sievers <kay.sievers@vrfy.org> wrote:
> > On Mon, 2006-05-22 at 13:10 -0400, sean wrote:
> > > I have a radeon dv video card, that has an ieee1394 port.
> > > The kernel finds it:

> > > dmesg | grep 1394
> > > ieee1394: Initialized config rom entry `ip1394'
> > > ohci1394: fw-host0: OHCI-1394 1.0 (PCI): IRQ=[193]
> > > MMIO=[f5000000-f50007ff]  Max Packet=[2048]  IR/IT
> > > contexts=[8/8]
> > > ieee1394: Host added: ID:BUS[0-00:1023]  GUID[0006bb0016051a55]
> > >
> > >
> > >   I'm trying to create /dev/dv1394 , raw1394.
> > >
> > > udev appears to find the port:
> > >
> > > udevtrigger --verbose | grep 1394
> > > /sys/bus/ieee1394/devices/0006bb0016051a55-0
> > > /sys/bus/ieee1394/devices/0006bb0016051a55
> > > /sys/bus/ieee1394/devices/fw-host0
> > > /sys/class/ieee1394/0006bb0016051a55-0
> > > /sys/class/ieee1394_node/0006bb0016051a55
> > > /sys/class/ieee1394_host/fw-host0
> > >
> > > but neither dv1394 or raw1394 are created, and I can't
> > > figure out what devices are created.
> >
> > What does:
> >   ls -l /sys/bus/ieee1394/devices/0006bb0016051a55-0
> >   (repeat for all devices you mentioned above)
> > print? Is there a "dev" file?
> >
>  Nope:
> find /sys/class/ieee1394 -name dev
> find /sys/bus/ieee1394 -name dev

Don't you have: /sys/class/ieee1394_protocol/ ?

> Since there are no "dev" files it's probably not a surprise
> udevmonitor showed no MAJOR/MINOR numbers:

Right, but I think the nodes are expected in ieee1394_protocol.

> So the *1394 drivers need to be fixed?  I'll post to the 1394 list.

Not sure.

> In the mean time, do I manually mknod the /dev/*1394? How does udev
> know to connect this physical device to those /dev files? Or is that
> the drivers' problem?

A device node has a major/minor number, that is passed to the kernel and
the kernel finds the matching driver with that number. Udev itself is
not involved with connecting anything, it just creates the nodes with
the right numbers.

Kay



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