Re: udev/hotplug and automatic /dev node creation

[Horst Schirmeier <horst@schirmeier.com>]

On Tue, 17 Jan 2006, Greg KH wrote:
> On Wed, Jan 18, 2006 at 03:47:10AM +0100, Horst Schirmeier wrote:
> > Hi,
> > 
> > I'm looking for documentation regarding how to write a Linux kernel
> > module that creates its own /dev node via udev/hotplug.
> > register_chrdev() and a simple udev/rules.d/ entry don't seem to be
> > sufficient...
> 
> Yes, register_chrdev() will do nothing for udev.
> 
> Take a look at the book, Linux Device Drivers, third edition (free
> online).  In the chapter about the driver model, there is a section
> about what udev needs.  The functions it says to use are no longer in
> the kernel, but it should point you in the right direction (hint, use
> class_device_create().)
> 
> If you have a pointer to your code, I can probably knock out a patch for
> you very quickly.

Now I'm using class_create() and class_device_create() (together with
class_device_destroy() and class_destroy()), which works fine on
2.6.15 and 2.6.16-rc1, and with some hackish LINUX_VERSION_CODE-checking
#define wrapper around class_device_create() also on 2.6.13 and
2.6.14...

But: Is there a common way to get this working on 2.6.12 or earlier?

Kind regards,
 Horst

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