Am Donnerstag, 4. Januar 2007 12:26 schrieb David Brownell:
> On Thursday 04 January 2007 12:27 am, Oliver Neukum wrote:
>
> > > I'll check tomorrow and see. Does HUB electronics include over-current
> > > sensing to detect that a device that says it wants 100ma is in fact
> > > attemping to draw 500ma ?
> >
> > No, protection is per hub, not port.
>
> ... on some hardware, yes it can be ganged.
> On other hardware, the reporting is per-port.
>
> The hub descriptor says which kind the hub uses.
> But there are wierd cases too, like when power
> switching is ganged but OC reporting isn't, and
> those cases aren't visible in the descriptors.
Yes, if this hack works, I'll add a function that requests additional
power to usbcore. It'll fail in the bus powered case. This is much
nicer than to mess with device initialisation.
> That magic command thing is an ugly hack, and I've
> not seen such a thing before. Better would be to
> just have two different configurations.
Definitely. But wishes don't help for existing hardware.
Regards
Oliver
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