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

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

On Fri, 2006-08-25 at 21:22 +0200, Jan Zwiegers wrote:
> > > > 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.

> Do you say that I need to look at how I implemented the
> class_device_create_file? Mine seems the same as others. Do you think this
> is the cause of my problem? 

I'm just guessing, but I expect you create the file with the name "dev"
which contains the major/minor number yourself in your driver. If that's
the case, you shouldn't do that and just set the dev_t value in the
device structure before registering the device, that will instruct the
driver core to create that file, along with environment variables needed
for udev to create a node.

The best way to do this, would probably be to use the class_device_create() function in /linux/drivers/base/class.c, which expects all the needed values as parameters.

Kay


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