linux-kernel - Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface

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Date:	Tue, 16 Feb 2016 14:39:47 +0100
From:	Oliver Neukum <oneukum@...e.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software
 Interface

On Tue, 2016-02-16 at 11:22 +0200, Heikki Krogerus wrote:
> > That question has not been answered. It would be awkward for the OS
> > to find itself in the slave role, which it is ill equipped for. So
> > the data role should be switched before the new device is announced
> > to user space. How is that handled?
> 
> In the class driver, once we add support for preselecting the role,
> when the connection happens we compare the initial role to the
> preselected one and execute swap if it differs. Only after that we
> notify userspace.

Yes, but we need an API. We can't keep adding to it. So if that
is to be supported, it needs to be defined now.

	Regards
		Oliver