Hi Vincent, On Fri, Aug 26, 2016 at 03:16:16PM +0200, Vincent Palatin wrote: > >> > +What: /sys/class/typec/<port>/current_vconn_role > >> > +Date: June 2016 > >> > +Contact: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> > >> > +Description: > >> > + Shows the current VCONN role of the port. This attribute can be > >> > + used to request VCONN role swap on the port when the port > >> > + supports USB Power Delivery. > >> > + > >> > + Valid values are: > >> > + - source > >> > + - sink > >> > >> > >> either we are currently sourcing vconn or not, but even if you are > >> not, you are probably not a vconn sink either (ie only vconn-powered > >> accessory are, your usual linux-powered laptop/phone is probably not) > > > > It's not relevant to know whether the vconn is being actually used or > > not here. I'm not sure what's your point? > > > My point was: saying we are a VCONN "sink" just because we are not > currently sourcing vconn is usually not true. OK, I understand your point now. You are correct. I think we need to change this attribute and call it "vconn_source" that reports "1" or "0". I'll change that and send one more version of these on Monday (hopefully the last one) unless somebody disagrees. > >> > +What: /sys/class/typec/<port>-partner/type > >> > +Date: June 2016 > >> > +Contact: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> > >> > +Description: > >> > + Shows the type of the partner. Can be one of the following: > >> > + - USB - When the partner is normal USB host/peripheral. > >> > + - Charger - When the partner has been identified as dedicated > >> > + charger. > >> > + - Alternate Mode - When the partner supports Alternate Modes. > >> > + - Accessory - When the partner is one of the accessories with > >> > + specific Accessory Mode defined in USB Type-C > >> > + specification. > >> > >> > >> where a dock would be classified ? > > > > A dock is just USB PD capable device with a bunch of alternate modes > > that is attached to the port. There is no specific identifier for a > > "dock". > > My remark was a bit too stern, > I meant a dock might be 'USB' 'Charger' 'Alternate Mode' , all at the > same time or alternately depending what you plug in. > I don't really see those types as mutually exclusive. So USB type means the partner does not have alternate modes (I'll clear that in the documentation), Charger is a dedicated charger and therefore can not be anything else (no USB, no alternate modes). To answer your original question, a dock would be reported as Alternate Mode. Thanks, -- heikki -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
