93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
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/* Copyright 2018 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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* Battery pack vendor provided charging profile
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*/
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#include "battery.h"
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#include "battery_fuel_gauge.h"
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#include "battery_smart.h"
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#include "gpio.h"
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#include "system.h"
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static enum battery_present batt_pres_prev = BP_NOT_SURE;
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enum battery_present battery_hw_present(void)
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{
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enum battery_present bp;
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/* The GPIO is low when the battery is physically present */
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/*
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* TODO(b/111704193): The signal GPIO_EC_BATT_PRES_ODL has an issue
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* where it's floating (?) at ~2V when it should be low when the battery
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* is connected. The signal will read correctly following a cold reset
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* and the battery is connected, but following a warm reboot, it reads
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* high. In order to allow charging to work, replacing this with the a
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* check that the Operation Status register can be read. Once the HW
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* issue is resolved then change this back to checking the physical
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* presence pin.
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*
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*/
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if (system_get_board_version() == 0)
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/* P0 boards can't use gpio signal */
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bp = (battery_get_disconnect_state() ==
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BATTERY_DISCONNECT_ERROR) ? BP_NO : BP_YES;
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else
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/* P1 boards can read presence from gpio signal */
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bp = gpio_get_level(GPIO_EC_BATT_PRES_ODL) ? BP_NO : BP_YES;
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return bp;
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}
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static int battery_init(void)
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{
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int batt_status;
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return battery_status(&batt_status) ? 0 :
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!!(batt_status & STATUS_INITIALIZED);
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}
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/*
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* Physical detection of battery.
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*/
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static enum battery_present battery_check_present_status(void)
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{
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enum battery_present batt_pres;
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/* Get the physical hardware status */
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batt_pres = battery_hw_present();
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/*
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* If the battery is not physically connected, then no need to perform
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* any more checks.
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*/
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if (batt_pres != BP_YES)
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return batt_pres;
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/*
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* If the battery is present now and was present last time we checked,
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* return early.
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*/
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if (batt_pres == batt_pres_prev)
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return batt_pres;
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/*
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* Ensure that battery is:
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* 1. Not in cutoff
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* 2. Initialized
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*/
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if (battery_is_cut_off() != BATTERY_CUTOFF_STATE_NORMAL ||
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battery_init() == 0) {
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batt_pres = BP_NO;
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}
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return batt_pres;
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}
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enum battery_present battery_is_present(void)
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{
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batt_pres_prev = battery_check_present_status();
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return batt_pres_prev;
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}
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