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Implement the following required features in the USB PD Rev. 3.0 specification. Not_supported control message: Inform a port partner that a particular message is not supported. Battery capabilities extended message: Report battery design capacity and last full charge capacity. Battery status data message: Report battery state of charge Collision avoidance: New scheme to avoid collisions caused when both source and sink want to send messages. Cable communication: Only the VCONN source can communicate with the cable plug. This is NOT implemented because although the drivers have the capability of communicating with a cable plug, the PD stack doesn't currently need to talk to a cable plug. This is okay since the current PD design doesn't source or sink more than 3 amps and all Type-C cables are required to be 3 amp capable. BUG=b:64411727 BRANCH=None TEST=`make -j buildall` Passed relevant PD Rev 2.0 compliance tests Successful PD negotiation with PD Rev 2.0 and 3.0 chargers Tested with low power none PD charger. Modified a Kevin to operate as a PD 3.0 charger and sent all required messages and verified the return messages. Also tested collision avoidance by verifying that a sink only transmits when the source indicates it's okay. Used Twinkie to verify that PD was operating as v3.0. Signed-off-by: Sam Hurst <shurst@chromium.org> Change-Id: Ifd77e92ec4e9106236f9221393d2bfb97263d979 Reviewed-on: https://chromium-review.googlesource.com/603003 Commit-Ready: Sam Hurst <shurst@google.com> Tested-by: Sam Hurst <shurst@google.com> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
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