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/* Copyright 2019 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 "timer.h"
#include "util.h"
enum battery_present batt_pres_prev = BP_NOT_SURE;
/*
* Physical detection of battery.
*/
static enum battery_present battery_check_present_status(void)
{
enum battery_present batt_pres = BP_NOT_SURE;
#ifdef CONFIG_BATTERY_HW_PRESENT_CUSTOM
/* Get the physical hardware status */
batt_pres = battery_hw_present();
#endif
/*
* If the battery is not physically connected, then no need to perform
* any more checks.
*/
if (batt_pres == BP_NO)
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 disconnect status. If we are unable to read battery
* disconnect status, 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 (battery_get_disconnect_state() == BATTERY_DISCONNECT_ERROR)
return BP_NOT_SURE;
/* Ensure the battery is not in cutoff state */
if (battery_is_cut_off() != BATTERY_CUTOFF_STATE_NORMAL)
return BP_NO;
return batt_pres;
}
enum battery_present battery_is_present(void)
{
batt_pres_prev = battery_check_present_status();
return batt_pres_prev;
}
#ifdef CONFIG_I2C_BITBANG
static void fix_single_param(int flag, int *cached, int *curr)
{
if (flag)
*curr = *cached;
else
*cached = *curr;
}
#define CACHE_INVALIDATION_TIME_US (5 * SECOND)
/*
* b:144195782: bitbang fails randomly, and there's no way to
* notify kernel side that bitbang read failed.
* Thus, if any value in batt_params is bad, replace it with a cached
* good value, to make sure we never send random numbers to kernel
* side.
*/
__override void board_battery_compensate_params(struct batt_params *batt)
{
static struct batt_params batt_cache = { 0 };
static timestamp_t deadline;
/*
* If battery keeps failing for 5 seconds, stop hiding the error and
* report back to host.
*/
if (batt->flags & BATT_FLAG_BAD_ANY) {
if (timestamp_expired(deadline, NULL))
return;
} else {
deadline.val = get_time().val + CACHE_INVALIDATION_TIME_US;
}
/* return cached values for at most CACHE_INVALIDATION_TIME_US */
fix_single_param(batt->flags & BATT_FLAG_BAD_STATE_OF_CHARGE,
&batt_cache.state_of_charge,
&batt->state_of_charge);
fix_single_param(batt->flags & BATT_FLAG_BAD_VOLTAGE,
&batt_cache.voltage,
&batt->voltage);
fix_single_param(batt->flags & BATT_FLAG_BAD_CURRENT,
&batt_cache.current,
&batt->current);
fix_single_param(batt->flags & BATT_FLAG_BAD_DESIRED_VOLTAGE,
&batt_cache.desired_voltage,
&batt->desired_voltage);
fix_single_param(batt->flags & BATT_FLAG_BAD_DESIRED_CURRENT,
&batt_cache.desired_current,
&batt->desired_current);
fix_single_param(batt->flags & BATT_FLAG_BAD_REMAINING_CAPACITY,
&batt_cache.remaining_capacity,
&batt->remaining_capacity);
fix_single_param(batt->flags & BATT_FLAG_BAD_FULL_CAPACITY,
&batt_cache.full_capacity,
&batt->full_capacity);
fix_single_param(batt->flags & BATT_FLAG_BAD_STATUS,
&batt_cache.status,
&batt->status);
fix_single_param(batt->flags & BATT_FLAG_BAD_TEMPERATURE,
&batt_cache.temperature,
&batt->temperature);
/*
* If battery_compensate_params() didn't calculate display_charge
* for us, also update it with last good value.
*/
fix_single_param(batt->display_charge == 0,
&batt_cache.display_charge,
&batt->display_charge);
/* remove bad flags after applying cached values */
batt->flags &= ~BATT_FLAG_BAD_ANY;
}
#endif /* CONFIG_I2C_BITBANG */
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