On Wed, Aug 14, 2013 at 10:27:26AM -0400, Alan Stern wrote: > On Wed, 14 Aug 2013, Mark Brown wrote: > > 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? The device on the bus. > 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? Yes, so you'd want callbacks when the device actually appears and disappears. > Perhaps the platform-level code would need to hook into the places > where the discoverable bus is registered and unregistered. We'd need some way to get information to the drivers still, and to handle drivers that want to stop and start things.
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