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/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Common battery presence checking for Volteer family.
* Each board should implement board_battery_info[] to define the specific
* battery packs supported.
*/
#include <stdbool.h>
#include "battery.h"
#include "battery_smart.h"
#include "gpio.h"
static enum battery_present batt_pres_prev = BP_NOT_SURE;
enum battery_present battery_hw_present(void)
{
/* The GPIO is low when the battery is physically present */
return gpio_get_level(GPIO_EC_BATT_PRES_ODL) ? BP_NO : BP_YES;
}
static bool battery_init(void)
{
int batt_status;
return battery_status(&batt_status) ?
0 :
!!(batt_status & STATUS_INITIALIZED);
}
__overridable bool board_battery_is_initialized(void)
{
/*
* Set default to return true
*/
return true;
}
/*
* Physical detection of battery.
*/
static enum battery_present battery_check_present_status(void)
{
enum battery_present batt_pres;
bool batt_initialization_state;
/* 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;
/*
* Check battery initialization. If the battery is not initialized,
* then return BP_NOT_SURE. Battery could be in ship
* mode and might require pre-charge current to wake it up. BP_NO is not
* returned here because charger state machine will not provide
* pre-charge current assuming that battery is not present.
*/
batt_initialization_state = board_battery_is_initialized();
if (!batt_initialization_state)
return BP_NOT_SURE;
/*
* Ensure that battery is:
* 1. Not in cutoff
* 2. Initialized
*/
if (battery_is_cut_off() || !battery_init())
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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