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For the dual data role, when the state is UFP assert the otg pins to activate the usb device controller. This will enable usb gadget mode and the board will act as usb device instead of host. For DFP state, de-assert the otg pins to activate the host mode. BUG=b:74339386 BRANCH=NONE TEST=Connect two Eve boards with the usb type c cable. On ec console, type the command usb pd 0 swap data. pd 0 state should return UFP mode. Verify that the otg pins are high (USB2_OTG_ID and USB2_OTG_VBUSSENSE). Change-Id: I0efb08ae3946ff09ce9dfeb89cff049e551fe000 Signed-off-by: Jagadish Krishnamoorthy <jagadish.krishnamoorthy@intel.com> Reviewed-on: https://chromium-review.googlesource.com/961381 Reviewed-by: Divya S Sasidharan <divya.s.sasidharan@intel.com> Reviewed-by: Duncan Laurie <dlaurie@google.com>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly