Re: [PATCH/RFC 2/5] usb:dummy_hcd: connect/disconnect test support

From: Alan Stern
Date: Thu Jun 16 2011 - 13:06:16 EST

On Thu, 16 Jun 2011, Felipe Balbi wrote:

> Hi,
> On Thu, Jun 16, 2011 at 11:06:47AM -0400, Alan Stern wrote:
> > On Thu, 16 Jun 2011, Tatyana Brokhman wrote:
> >
> > > This implementation adds a new proprietary device control requests (to be
> > > handled by the dummy_hcd) that initiates a connect/disconnect sequence.
> > > The bRequest value of the new control request is 0x52.
> > > It is used by the user-space Unit testing application.
> >
> > This is not a bad idea. On the other hand, it is slightly peculiar --
> > it you're testing with real UDC hardware, you would do the
> > disconnect/reconnect sequence by hand (unplug and replug the USB
> > cable), not in software.
> actually, this is quite useful. Specially for the controllers which
> _can_ do soft-connect by toggling data pullups. I would rather have
> these sort of thing maybe in composite.c, so that we can build tests
> with all gadget drivers/controllers, not only dummy_hcd.

It sounds like you don't understand the point of this patch. It allows
the _host_ to control the pullup settings.

Alan Stern

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