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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>
39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef __CHARGE_MANAGER_H
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#define __CHARGE_MANAGER_H
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/* Charge port that indicates no active port */
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#define CHARGE_PORT_NONE -1
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/* Initial charge state */
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#define CHARGE_CURRENT_UNINITIALIZED -1
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#define CHARGE_VOLTAGE_UNINITIALIZED -1
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#define POWER(charge_port) ((charge_port.current) * (charge_port.voltage))
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/* Charge suppliers, sorted by priority */
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enum charge_supplier {
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CHARGE_SUPPLIER_NONE = -1,
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/* Highest priority supplier first */
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CHARGE_SUPPLIER_PD = 0,
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CHARGE_SUPPLIER_TYPEC = 1,
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CHARGE_SUPPLIER_BC12 = 2,
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CHARGE_SUPPLIER_COUNT
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};
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/* Charge tasks report available current and voltage */
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struct charge_port_info {
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int current;
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int voltage;
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};
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/* Called by charging tasks to update their available charge */
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void charge_manager_update(enum charge_supplier supplier,
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int charge_port,
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struct charge_port_info *charge);
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#endif /* __CHARGE_MANAGER_H */
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