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