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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "battery.h"
#include "battery_smart.h"
#include "common.h"
#include <zephyr/drivers/gpio.h>
static enum battery_present batt_pres_prev = BP_NOT_SURE;
__overridable bool board_battery_is_initialized(void)
{
int batt_status;
return battery_status(&batt_status) != EC_SUCCESS ?
false :
!!(batt_status & STATUS_INITIALIZED);
}
/*
* Physical detection of battery.
*/
static enum battery_present battery_check_present_status(void)
{
enum battery_present batt_pres;
if (battery_is_cut_off())
return BP_NO;
/* 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_NO)
return BP_NO;
/*
* If the battery is present now and was present last time we checked,
* return early.
*/
if ((batt_pres == BP_YES) && (batt_pres == batt_pres_prev))
return BP_YES;
/*
* 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.
*/
if (!board_battery_is_initialized())
return BP_NOT_SURE;
return BP_YES;
}
enum battery_present battery_is_present(void)
{
batt_pres_prev = battery_check_present_status();
return batt_pres_prev;
}
enum battery_present battery_hw_present(void)
{
const struct gpio_dt_spec *batt_pres;
batt_pres = GPIO_DT_FROM_NODELABEL(gpio_ec_batt_pres_odl);
/*
* The GPIO is low when the battery is physically present.
* But if battery cell voltage < 2.5V, it will not able to
* pull down EC_BATT_PRES_ODL. So we need to set pre-charge
* current even EC_BATT_PRES_ODL is high.
*/
return gpio_pin_get_dt(batt_pres) ? BP_NOT_SURE : BP_YES;
}
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