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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Charge input current limit ramp module for Chrome EC */
#include "charge_manager.h"
#include "common.h"
#include "system.h"
#include "usb_charge.h"
#include "util.h"
test_mockable int chg_ramp_allowed(int port, int supplier)
{
/* Don't allow ramping in RO when write protected. */
if (!system_is_in_rw() && system_is_locked())
return 0;
switch (supplier) {
/* Use ramping for USB-C DTS suppliers (debug accessory eg suzy-q). */
case CHARGE_SUPPLIER_TYPEC_DTS:
return 1;
/*
* Use HW ramping for USB-C chargers. Don't use SW ramping since the
* slow ramp causes issues with auto power on (b/169634979).
*/
case CHARGE_SUPPLIER_PD:
case CHARGE_SUPPLIER_TYPEC:
return IS_ENABLED(CONFIG_CHARGE_RAMP_HW);
/* default: fall through */
}
/* Otherwise ask the BC1.2 detect module */
return usb_charger_ramp_allowed(port, supplier);
}
test_mockable int chg_ramp_max(int port, int supplier, int sup_curr)
{
switch (supplier) {
case CHARGE_SUPPLIER_PD:
case CHARGE_SUPPLIER_TYPEC:
case CHARGE_SUPPLIER_TYPEC_DTS:
/*
* We should not ramp DTS beyond what they advertise, otherwise
* we may brownout the systems they are connected to.
*/
return sup_curr;
/* default: fall through */
}
/* Otherwise ask the BC1.2 detect module */
return usb_charger_ramp_max(port, supplier, sup_curr);
}
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