57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
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/* Copyright 2017 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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/* Charge input current limit ramp module for Chrome EC */
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#include "charge_manager.h"
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#include "common.h"
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#include "system.h"
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#include "usb_charge.h"
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#include "util.h"
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#define TYPEC_DTS_RAMP_MAX 2400
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test_mockable int chg_ramp_allowed(int supplier)
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{
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/* Don't allow ramping in RO when write protected. */
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if (!system_is_in_rw() && system_is_locked())
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return 0;
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switch (supplier) {
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case CHARGE_SUPPLIER_TYPEC_DTS:
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#ifdef CONFIG_CHARGE_RAMP_HW
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/* Need ramping for USB-C chargers as well to avoid voltage droops. */
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case CHARGE_SUPPLIER_PD:
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case CHARGE_SUPPLIER_TYPEC:
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#endif
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return 1;
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/* default: fall through */
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}
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/* Othewise ask the BC1.2 detect module */
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return usb_charger_ramp_allowed(supplier);
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}
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test_mockable int chg_ramp_max(int supplier, int sup_curr)
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{
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switch (supplier) {
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case CHARGE_SUPPLIER_TYPEC_DTS:
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/*
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* Ramp DTS suppliers to advertised current or predetermined
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* limit, whichever is greater.
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*/
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return MAX(TYPEC_DTS_RAMP_MAX, sup_curr);
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#ifdef CONFIG_CHARGE_RAMP_HW
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case CHARGE_SUPPLIER_PD:
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case CHARGE_SUPPLIER_TYPEC:
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return sup_curr;
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#endif
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/* default: fall through */
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}
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/* Otherwise ask the BC1.2 detect module */
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return usb_charger_ramp_max(supplier, sup_curr);
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}
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