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charge_manager is intended to manage charge limits from various tasks (typically PD charge tasks and USB / BC 1.2 charge tasks). These tasks can update the charge limit of a port by calling charge_manager_update (thread-safe function). If the charge limit has changed, charge_manager_refresh will be queued as a deferred task, which will select the "best" charge port and set the proper charge limit. In order to use charge_manager, a board needs to do the following: 1. Declare PD_PORT_COUNT in usb_pd_config.h 2. Implement board_set_charge_limit 3. Implement board_set_active_charge_port 4. Call charge_manager_update whenever the available charge on a port changes. BUG=chrome-os-partner:31361 TEST=Manual on samus_pd, with subsequent commit. Insert and remove various chargers, check console to verify PD charger always has priority and correct current limit is set based upon 'best' charger. BRANCH=samus Change-Id: Iede120b69e0b46ed329bcf9b7e07c39ba5e9f77b Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/222723 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