Messages in this thread | | | Subject | Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI | From | Guenter Roeck <> | Date | Fri, 6 May 2016 07:08:12 -0700 |
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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
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