[linux-pm] States we need to represent

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On Wed, 2004-11-03 at 02:17 +0100, Pavel Machek wrote:

> How would you define this if you wanted to make it "event"? It does
> not really change state of driver. State of driver is still ON, but
> something alocated, etc.

Well... where did we say that "events" had to change the state of a
driver ? Some do ... but we can define some that don't and are purely
informational...

For example, the ability for userland to force-trigger driver local PM
policy could be implemented by calling a suspend with a special event,
that sort of thing...

> Hmm, maybe that list-based callback is not so bad idea after
> all. Because otherwise we'd need to deal with suspend / resume
> nesting, and that looks ugly. Oops.

Not really. I've done it in the past for pmac before the driver model
was there. As long as the common code doesn't keep a state, it's fine.

Ben.




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