On Thu, 2016-05-19 at 15:44 +0300, Heikki Krogerus wrote: > The purpose of this class is to provide unified interface for user > space to get the status and basic information about USB Type-C > Connectors in the system, control data role swapping, and when USB PD > is available, also power role swapping and Alternate Modes. > > Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> > --- > drivers/usb/Kconfig | 2 + > drivers/usb/Makefile | 2 + > drivers/usb/type-c/Kconfig | 7 + > drivers/usb/type-c/Makefile | 1 + > drivers/usb/type-c/typec.c | 957 ++++++++++++++++++++++++++++++++++++++++++++ > include/linux/usb/typec.h | 230 +++++++++++ > 6 files changed, 1199 insertions(+) > create mode 100644 drivers/usb/type-c/Kconfig > create mode 100644 drivers/usb/type-c/Makefile > create mode 100644 drivers/usb/type-c/typec.c > create mode 100644 include/linux/usb/typec.h > > Hi, > > Like I've told some of you guys, I'm trying to implement a bus for > the Alternate Modes, but I'm still nowhere near finished with that > one, so let's just get the class ready now. The altmode bus should in > any case not affect the userspace interface proposed in this patch. > > As you can see, the Alternate Modes are handled completely differently > compared to the original proposal. Every Alternate Mode will have > their own device instance (which will be then later bound to an > Alternate Mode specific driver once we have the bus), but also every > partner, cable and cable plug will have their own device instances > representing them. That raises a question. If I read the standard correctly, alternate modes could be combinable. So how do you represent that. > An other change is that the data role is now handled in two ways. > The current_data_role file will represent static mode of the port, and > it will use the names for the roles as they are defined in the spec: > DFP, UFP and DRP. This file should be used if the port needs to be > fixed to one specific role with DRP ports. So this approach will > replace the suggestions for "preferred" data role we had. The > current_usb_data_role will use values "host" and "device" and it will > be used for data role swapping when already connected. Please explain. How does that express DRP but prefered master? > I Hope I remembered to CC everybody interested. Alternate modes can be left involuntarily. So we need a method of notification. Regards Oliver -- 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
