RE: issues getting I/O device to work with udev....

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

On Fri, 2006-08-25 at 15:47 +0200, Jan Zwiegers wrote:
> > -----Original Message-----
> > From: linux-hotplug-devel-bounces@lists.sourceforge.net [mailto:linux-
> > hotplug-devel-bounces@lists.sourceforge.net] On Behalf Of Kay Sievers
> > Sent: 25 August 2006 03:00 PM
> > To: jan@eagle.co.za
> > Cc: 'John Thomas'; linux-hotplug-devel@lists.sourceforge.net; 'Ray
> > Schumacher'; md@Linux.IT
> > Subject: RE: issues getting I/O device to work with udev....
> > 
> > On Fri, 2006-08-25 at 13:38 +0200, Jan Zwiegers wrote:
> > > > > fact that the device gets created under /dev/edredaq/device0-99.
> > This
> > > > rules
> > > > > worked just fine on previous systems, but suddenly it started to
> > fail on
> > > > > newer distros.
> > 
> > > > > Can you guys maybe point me to a solution?
> > > >
> > > > Hmm, what exactly is the problem? What suddenly started to fail?
> > > > Can you paste the output of 'udevmonitor' when you load the kernel
> > > > module? Or the output when connect the USB device, if you only have it
> > > > built-in.
> > 
> > > The node /dev/edredaq/device0 never get created, or it does not show up
> > in
> > > the file system (maybe it's permission / security related).
> > Unfortunately I
> > > have left work already and cannot do the 'udevmonitor' for you.
> > 
> > Oh, that all sounds very much like you don't use the right driver core
> > functions and you create the "dev" file yourself in sysfs. You must use
> > the right functions in the kernel and pass the correct dev_t to the
> > device registration. That will automatically create the "dev" file and
> > add the needed data to the uevent environment, to let udev create the
> > node.
> > 
> > But again, to verify this, we need the output of "udevmonitor --env",
> > while you plug in a device or re-trigger the event by writing "add" to
> > the "uevent" file in the sysfs device directory.
> 
> 
> I just create a simple device class by making use of:
> 
> 'class_device_register' &
> 'class_device_createfile'
> to create /sys/class/edredaq/device0 &
> /sys/class/edredaq/device0/edredaq_nodename

See how class_device_create() works and fills in dev_t, you need to
convert to that function or do the same with the dev_t value. You also
need to set the 'device' pointer like that function does, to make
userspace happy.

Kay


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