Re: Udev, hal and loading of modules

[David Zeuthen <david@fubar.dk>]

On Tue, 2007-02-06 at 22:45 +0100, Kay Sievers wrote:
> On 2/6/07, Erik Andrén <erik.andren@gmail.com> wrote:
> > I've recently developed an addon for hal enabling backlight on dell
> > machines to be controlled via dbus/hal. The catch right now is that the
> > "dcdbas" linux kernel module needs to be loaded for the addon to work.
> >
> > My question is if there is a way for hal to suggest to udev what modules
> > to load? Or are there better alternatives, such as udev probing the
> > smbios (via dmidecode) and load the module that way?
> 
> Udev loads only modules, which are suggested by a MODALIAS value
> supplied by the kernel. There is no generic infrastructure in udev to
> load any module depending on other properties. 

Supposedly 

 - the kernel could export some node in sysfs describing the system
   (akin to HAL's computer root object); for smbios it would contain
   some DMI data; for other machine types it would contain something
   else (e.g. EFI)

 - modules like dcdbas could suggest a MODALIAS value and we could
   match this on the system node

 - udev would load the driver on matches

How about that?

> Unfortunately, there is
> no solution today; it's up to the distro tools to add an entry to some
> file to load such modules unconditionally.

This sucks and therefore we should change it.

     David




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