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If multiple TCPCs are present on a system then we may have multiple alert signals, each of which alerts us to the status of a different TCPC. Make boards with external non cros-ec TCPCs define tcpc_get_alert_status, which returns alert status based upon any alert GPIOs present, and then service only ports which are alerting. BUG=chromium:551683,chrome-os-partner:47851 TEST=Verify snoball PDCMD task sleeps appropriately when no devices are inserted, and verify ports go to PD_DISCOVERY state when we attach samus. Also verify that glados / glados_pd can still negotiate PD. BRANCH=None Change-Id: Iae6c4e1ef4d6685cb5bf7feef713505925a07c8c Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/313209 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Alec Berg <alecaberg@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit