Messages in this thread | | | Date | Wed, 14 Aug 2013 10:27:26 -0400 (EDT) | From | Alan Stern <> | Subject | Re: Non-enumerable devices on USB and other enumerable buses |
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On Wed, 14 Aug 2013, Mark Brown wrote:
> On Mon, Aug 12, 2013 at 09:04:00PM -0400, Alan Stern wrote: > > > The bus code would need hooks installed wherever the platform wants to > > do something extra. This could end up growing to a lot of hooks. How > > can the whole thing be done in a reasonable fashion? > > I'd expect that we're just looking at hooks around connection and > disconnection here here - if we're looking at much more it seems like we > must be doing something wrong.
Connection and disconnection of what?
In the example mentioned earlier, the GPIOs to power an on-board USB hub would have to be initialized when the host controller was started. You wouldn't want to wait for the on-board hub to be detected, because without those GPIOs set properly, it never would be discovered on the USB bus. Right?
Perhaps the platform-level code would need to hook into the places where the discoverable bus is registered and unregistered.
Alan Stern
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