Re: USB port power off discussion

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On Monday, September 24, 2012, Arjan van de Ven wrote:
> On 9/24/2012 12:13 AM, Alan Stern wrote:
> > Therefore all we need is an API for individual devices, not for
> > domains.  Of course, userspace may want to know which devices all
> > belong to the same power domain.
> 
> agreed on both.
> 
> I'd like PowerTOP to be able to report at least who keeps power alive and such.. ;-)

Sure enough.

That's not so simple in general, though, because there may be a hierarchy of
power domains and it doesn't need to be a tree (there are domains having two
"parents", for example).  Exposing _that_ to user space in a straightforward
way may be sort of challenging.

Thanks,
Rafael
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