From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758251AbcEFOIW (ORCPT ); Fri, 6 May 2016 10:08:22 -0400 Received: from bh-25.webhostbox.net ([208.91.199.152]:33391 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757430AbcEFOIU (ORCPT ); Fri, 6 May 2016 10:08:20 -0400 Subject: Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI To: Heikki Krogerus References: <1455037283-106479-1-git-send-email-heikki.krogerus@linux.intel.com> <20160505030544.GA25632@roeck-us.net> <20160506080840.GB29820@kuha.fi.intel.com> Cc: Greg KH , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Mathias Nyman , Felipe Balbi From: Guenter Roeck Message-ID: <572CA54C.6000204@roeck-us.net> Date: Fri, 6 May 2016 07:08:12 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 MIME-Version: 1.0 In-Reply-To: <20160506080840.GB29820@kuha.fi.intel.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Authenticated_sender: linux@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: linux@roeck-us.net X-Authenticated-Sender: bh-25.webhostbox.net: linux@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 05/06/2016 01:08 AM, Heikki Krogerus wrote: > Hi, > > On Wed, May 04, 2016 at 08:05:44PM -0700, Guenter Roeck wrote: >> 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. > > Interesting. So I'm guessing TCPM is actually an implementation USB PD > software stack, no? AFAIK FUSB302 has USB PD transceiver, right? > Yes, both correct. >> Is there any chance to advance this patch set ? It would be instrumental >> to get a unified interface to user space. > > I don't have not made any new code for the class driver yet, but I'm > attempting to prepare v2 next week. > Excellent! Please cc me - either this e-mail address or groeck@chromium.org. Thanks, Guenter