Re: device model?

[Matthew Wilcox <willy-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>]

On Thu, Jun 12, 2003 at 08:23:41AM -0700, Patrick Mochel wrote:
> > Why doesn't struct acpi_device contain a struct device?
> 
> Because they are not devices, only the firmware representation of them. :) 

Umm.  OK, smartypants :-P

But I have some devices which _only_ have a firmware representation.
For example, there's a couple of serial ports on this workstation which
can't be found any other way.  Then there's the SBA and LBA devices I
mention below.  These devices have basically nothing in common except
that they only have an acpi_device to represent them.

> struct acpi_device contains a kobject that is registered in 
> drivers/acpi/scan.c. The hierarchy is represented in 
> /sys/firmware/acpi/namespace.
> 
> Ideally, when an ACPI namespace object is found, the bus on which the 
> device belongs will be notified of a found device, so that it may probe,
> intiialize, and register the device properly. That will give it 
> representation in /sys/devices, and ACPI could then provide a symlink 
> between its object's directory and the device's directory. 
> 
> But, it hasn't happened yet.

hmm.  so you want a serial_object, an lba_object and an sba_object?
then we can tie them together through the namespaces?  I feel lost in
a maze of pointers, all subtly different.

-- 
"It's not Hollywood.  War is real, war is primarily not about defeat or
victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk


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