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Set input current limit based on the max current from the PD negotiation. For samus, this information is passed to the EC as a host command. For ryu, the max current is set directly following a negotiation. CONFIG_CHARGER_INPUT_CURRENT is now just the default limit, but after a successful PD negotiation, the limit can be raised. Note, for now the input current limit for samus is set to 2/3 of the value negotiated for. This is due to hardware problems measuring input current on p2b boards. BUG=chrome-os-partner:28532, chrome-os-partner:24461 BRANCH=none TEST=tested on a samus. Verified input current limit using "charger" console command from EC. Input current limit after a reboot is 512. When zinger is plugged in, it jumps to the appropriate value (currently 1280mA), and when the negotiation is changed using the "pd 0 dev 5" command on the PD console, the input current limit is adjusted to match (2000mA). Change-Id: Iab9186a0f9814655e3240217a9baf4a38f15f84d Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/211023 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