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/* Copyright (c) 2012 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_pack.h"
/*
* Design capacity
* Battery capacity = 8200 mAh
* 1C = 8200 mA
*/
#define DESIGN_CAPACITY 8200
#define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731)
enum {
TEMP_RANGE_10,
TEMP_RANGE_23,
TEMP_RANGE_35,
TEMP_RANGE_45,
TEMP_RANGE_50,
TEMP_RANGE_MAX
};
enum {
VOLT_RANGE_7200,
VOLT_RANGE_8000,
VOLT_RANGE_8400,
VOLT_RANGE_MAX
};
/*
* Vendor provided charging method
* temp : < 7.2V, 7.2V ~ 8.0V, 8.0V ~ 8.4V
* - 0 ~ 10 : 0.8A 1.6A 0.8A
* - 10 ~ 23 : 1.6A 4.0A 1.6A
* - 23 ~ 35 : 4.0A 4.0A 4.0A
* - 35 ~ 45 : 1.6A 4.0A 1.6A
* - 45 ~ 50 : 0.8A 1.6A 0.8A
*/
static const int const current_limit[TEMP_RANGE_MAX][VOLT_RANGE_MAX] = {
{ 800, 1600, 800},
{1600, 4000, 1600},
{4000, 4000, 4000},
{1600, 4000, 1600},
{ 800, 1600, 800},
};
static const struct battery_info info = {
/*
* Design voltage
* max = 8.4V
* normal = 7.4V
* min = 6.0V
*/
.voltage_max = 8400,
.voltage_normal = 7400,
.voltage_min = 6000,
/*
* Operational temperature range
* 0 <= T_charge <= 50 deg C
* -20 <= T_discharge <= 60 deg C
*/
.temp_charge_min = CELSIUS_TO_DECI_KELVIN(0),
.temp_charge_max = CELSIUS_TO_DECI_KELVIN(50),
.temp_discharge_min = CELSIUS_TO_DECI_KELVIN(-20),
.temp_discharge_max = CELSIUS_TO_DECI_KELVIN(60),
/* Pre-charge current: I <= 0.01C */
.precharge_current = (int)(DESIGN_CAPACITY * 0.01),
};
static inline void limit_value(int *val, int limit)
{
if (*val > limit)
*val = limit;
}
const struct battery_info *battery_get_info(void)
{
return &info;
}
void battery_vendor_params(struct batt_params *batt)
{
int *desired_current = &batt->desired_current;
int temp_range, volt_range;
/* Limit charging voltage */
if (batt->desired_voltage > info.voltage_max)
batt->desired_voltage = info.voltage_max;
/* Don't charge if outside of allowable temperature range */
if (batt->temperature >= info.temp_charge_max ||
batt->temperature <= info.temp_charge_min) {
batt->desired_voltage = 0;
batt->desired_current = 0;
return;
}
if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(10))
temp_range = TEMP_RANGE_10;
else if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(23))
temp_range = TEMP_RANGE_23;
else if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(35))
temp_range = TEMP_RANGE_35;
else if (batt->temperature <= CELSIUS_TO_DECI_KELVIN(45))
temp_range = TEMP_RANGE_45;
else
temp_range = TEMP_RANGE_50;
if (batt->voltage < 7200)
volt_range = VOLT_RANGE_7200;
else if (batt->voltage < 8000)
volt_range = VOLT_RANGE_8000;
else
volt_range = VOLT_RANGE_8400;
limit_value(desired_current, current_limit[temp_range][volt_range]);
#ifndef CONFIG_SLOW_PRECHARGE
/* If battery wants current, give it at least the precharge current */
if (*desired_current > 0 && *desired_current < info.precharge_current)
*desired_current = info.precharge_current;
#endif /* CONFIG_SLOW_PRECHARGE */
}
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