linux-kernel - Re: [RFC PATCHv2] usb: USB Type-C Connector Class

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Message-ID: <20160525145957.GA19413@roeck-us.net>
Date:	Wed, 25 May 2016 07:59:57 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Oliver Neukum <oneukum@...e.com>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Rajaram R <rajaram.officemail@...il.com>,
	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [RFC PATCHv2] usb: USB Type-C Connector Class

On Wed, May 25, 2016 at 04:20:56PM +0200, Oliver Neukum wrote:
> On Wed, 2016-05-25 at 17:04 +0300, Heikki Krogerus wrote:
> 
> > I'm not against leaving the responsibility of registering the alternate
> > modes to the drivers. I'm a little bit worried about relying then on
> > the drivers to also handle the unregistering accordingly, but I can
> > live with that. But we just shouldn't share the responsibility of
> > un/registering them between the class and the drivers, so the driver
> > should then handle the registration always.
> > 
> > Oliver, what do you think?
> 
> Either will do for me. Registration by the drivers is a bit better.
> But it has to be the one or the other. Mixing is indeed bad.
> 
Same here. I don't have any problems handling unregistering
from the driver. I just have to keep track of the state and call
typec_unregister_altmodes() before calling typec_disconnect().

Having to wait for mode discovery to complete before calling
typec_connect() is much more complicated, at least with my current
code.

Guenter