Hi Guenter, Guenter Roeck <linux@xxxxxxxxxxxx> writes: > 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. A newer version of $subject is already in Greg's queue [1] [1] https://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=0c1849a8c7af652c92ad0265a7ca5934fd773c69 -- balbi
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