Re: [Linux-fbdev-devel] Re: New API

[Patrick M. <mo...@in...>]

I am only half-paying attention and I saw my name...


On Fri, 16 Nov 2001, James Simmons wrote:

> 
> > >Where can I find this work or is it vaporware? As how stable is it? Will
> > >it be the final solution that will go in? I like to port a few subsystems
> > >in my CVS to it.
> > > 
> > >> Speaking of this.. do you know what the plans for ddfs are?
> > >
> > >Yet another device filesystem? The nice thing about a new unified device
> > >interface is it will make the device filesystems I plan to work much
> > >easier to implement.
> > 
> > Ask Patrick and the linux mailing list. AFAIK, His current patches not
> > only provide the unified struct device with PM hooks, but also the
> > device filesystem.
> 
> Good. I sent out the email. Also if he has a very mature device filesystem
> that will make our lives easier.

The code lives on kernel.org:

	ftp://ftp.kernel.org/pub/linux/kernel/people/mochel/device

There is a document that should be relatively up to date describing what's
going on. 

The gist of it is that it provides a unified device tree based on
locality. Nodes are added by the bus drivers on which a device sits. So,
the PCI layer adds nodes for all devices that it finds when probing the
bus. 

There is also a filesystem that goes along with it and presents this
unified view to userspace.

The power management code is not explicitly included in that code. I have
implemented one suspend/resume transition, but it is in the ACPI
subsystem, which you can get from Intel:

	http://developer.intel.com/technology/IAPC/acpi/index.htm

I have thought about doing a general PM imeplementation, but probably will
not, since there are too many platform-specific things that you must worry
about to make it elegant..

	-pat