From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755910AbcEEDFy (ORCPT ); Wed, 4 May 2016 23:05:54 -0400 Received: from bh-25.webhostbox.net ([208.91.199.152]:45082 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755853AbcEEDFw (ORCPT ); Wed, 4 May 2016 23:05:52 -0400 Date: Wed, 4 May 2016 20:05:44 -0700 From: Guenter Roeck To: Heikki Krogerus Cc: Greg KH , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Mathias Nyman , Felipe Balbi Subject: Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Message-ID: <20160505030544.GA25632@roeck-us.net> References: <1455037283-106479-1-git-send-email-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1455037283-106479-1-git-send-email-heikki.krogerus@linux.intel.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-Authenticated_sender: guenter@roeck-us.net X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-Get-Message-Sender-Via: bh-25.webhostbox.net: authenticated_id: guenter@roeck-us.net X-Authenticated-Sender: bh-25.webhostbox.net: guenter@roeck-us.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 09, 2016 at 07:01:20PM +0200, Heikki Krogerus wrote: > Hi, > > The OS, or more precisely the user space, needs to be able to control > a few things regarding USB Type-C ports. The first thing that must be > allowed to be controlled is the data role. USB Type-C ports will > select the data role randomly with DRP ports. When USB PD is > supported, also independent (from data role) power role swapping can > be supported together with Alternate Mode control. > > I'm proposing with this set a Class for the Type-C connectors that > gives the user space control over those things on top of getting basic > details about the USB Type-C connectors and also partners. The details > include the capabilities of the port, the supported data and power > roles, supported accessories (audio and debug), supported Alternate > Modes, USB PD support and of course the type of the partner (USB, Alt > Mode, Accessory or Charger), and more or less the same details about > the partner. > > I'm not considering cables with this Class, and I have deliberately > left out some more technical details, like cable orientation, firstly > because I did not see much use for the user space from knowing that > an secondly because that kind of details are not always available for > example with UCSI. > > So the interface to the user space is kept as simple as I dared to > make it. > > NOTE: In case there is somebody wondering, this is not adding USB PD > support to Linux kernel. This is just about USB Type-C. > Hello Heikki, we have implemented a prototype TCPM (USB Type-C Protocol Manager) software on top of your patch set. It will support TCPCI as well as other USB-C controllers such as FUSB302. The plan is to use this software in systems where no separate controller is available. Is there any chance to advance this patch set ? It would be instrumental to get a unified interface to user space. Thanks, Guenter