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[Bug 1001024] STM32 USB driver and proposed USB API change
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: ecos-patches at ecos dot sourceware dot org
- Date: Thu, 21 Oct 2010 16:40:23 +0100
- Subject: [Bug 1001024] STM32 USB driver and proposed USB API change
- Auto-submitted: auto-generated
- References: <bug-1001024-104@http.bugs.ecos.sourceware.org/>
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Alan Bowman <alan.bowman@datong.co.uk> changed:
What |Removed |Added
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CC| |alan.bowman@datong.co.uk
--- Comment #31 from Alan Bowman <alan.bowman@datong.co.uk> 2010-10-21 16:40:19 BST ---
> I don't think this scenario is supported by the USB spec - a single end device
> can only ever implement a single class driver, as identified by the device
> descriptor. To get multiple class drivers running behind a single USB
> connector, you would need to emulate a USB hub and hang the class drivers off
> the back of that - one per virtual USB slave device.
While I haven't looked through the spec for a while, I believe that you _can_
have multiple class drivers on a single device without using a virtual hub. I
think it's called a composite device. The descriptor arrangement is a bit more
complicated, but it's still possible.
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