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/* Copyright 2015 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_smart.h"
#include "charge_state.h"
#include "console.h"
#include "ec_commands.h"
#include "i2c.h"
#include "util.h"
/* Shutdown mode parameter to write to manufacturer access register */
#define PARAM_CUT_OFF_LOW 0x10
#define PARAM_CUT_OFF_HIGH 0x00
/* Battery info for BQ40Z55 */
static const struct battery_info info = {
.voltage_max = 8700, /* mV */
.voltage_normal = 7600,
.voltage_min = 6000,
.precharge_current = 256, /* mA */
.start_charging_min_c = 0,
.start_charging_max_c = 46,
.charging_min_c = 0,
.charging_max_c = 60,
.discharging_min_c = 0,
.discharging_max_c = 60,
};
const struct battery_info *battery_get_info(void)
{
return &info;
}
int board_cut_off_battery(void)
{
int rv;
uint8_t buf[3];
/* Ship mode command must be sent twice to take effect */
buf[0] = SB_MANUFACTURER_ACCESS & 0xff;
buf[1] = PARAM_CUT_OFF_LOW;
buf[2] = PARAM_CUT_OFF_HIGH;
i2c_lock(I2C_PORT_BATTERY, 1);
rv = i2c_xfer_unlocked(I2C_PORT_BATTERY, BATTERY_ADDR_FLAGS,
buf, 3, NULL, 0, I2C_XFER_SINGLE);
rv |= i2c_xfer_unlocked(I2C_PORT_BATTERY, BATTERY_ADDR_FLAGS,
buf, 3, NULL, 0, I2C_XFER_SINGLE);
i2c_lock(I2C_PORT_BATTERY, 0);
return rv;
}
#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
static int fast_charging_allowed = 1;
/*
* This can override the smart battery's charging profile. To make a change,
* modify one or more of requested_voltage, requested_current, or state.
* Leave everything else unchanged.
*
* Return the next poll period in usec, or zero to use the default (which is
* state dependent).
*/
int charger_profile_override(struct charge_state_data *curr)
{
/* temp in 0.1 deg C */
int temp_c = curr->batt.temperature - 2731;
/* keep track of last temperature range for hysteresis */
static enum {
TEMP_RANGE_1,
TEMP_RANGE_2,
TEMP_RANGE_3,
TEMP_RANGE_4,
TEMP_RANGE_5,
} temp_range = TEMP_RANGE_3;
/* keep track of last voltage range for hysteresis */
static enum {
VOLTAGE_RANGE_LOW,
VOLTAGE_RANGE_HIGH,
} voltage_range = VOLTAGE_RANGE_LOW;
/* Current and previous battery voltage */
int batt_voltage;
static int prev_batt_voltage;
/*
* Determine temperature range. The five ranges are:
* < 10C
* 10-15C
* 15-23C
* 23-45C
* > 45C
*
* Add 0.2 degrees of hysteresis.
* If temp reading was bad, use last range.
*/
if (!(curr->batt.flags & BATT_FLAG_BAD_TEMPERATURE)) {
if (temp_c < 99)
temp_range = TEMP_RANGE_1;
else if (temp_c > 101 && temp_c < 149)
temp_range = TEMP_RANGE_2;
else if (temp_c > 151 && temp_c < 229)
temp_range = TEMP_RANGE_3;
else if (temp_c > 231 && temp_c < 449)
temp_range = TEMP_RANGE_4;
else if (temp_c > 451)
temp_range = TEMP_RANGE_5;
}
/*
* If battery voltage reading is bad, use the last reading. Otherwise,
* determine voltage range with hysteresis.
*/
if (curr->batt.flags & BATT_FLAG_BAD_VOLTAGE) {
batt_voltage = prev_batt_voltage;
} else {
batt_voltage = prev_batt_voltage = curr->batt.voltage;
if (batt_voltage < 8200)
voltage_range = VOLTAGE_RANGE_LOW;
else if (batt_voltage > 8300)
voltage_range = VOLTAGE_RANGE_HIGH;
}
/*
* If we are not charging or we aren't using fast charging profiles,
* then do not override desired current and voltage.
*/
if (curr->state != ST_CHARGE || !fast_charging_allowed)
return 0;
/*
* Okay, impose our custom will:
* When battery is 0-10C:
* CC at 486mA @ 8.7V
* CV at 8.7V
*
* When battery is <15C:
* CC at 1458mA @ 8.7V
* CV at 8.7V
*
* When battery is <23C:
* CC at 3402mA until 8.3V @ 8.7V
* CC at 2430mA @ 8.7V
* CV at 8.7V
*
* When battery is <45C:
* CC at 4860mA until 8.3V @ 8.7V
* CC at 2430mA @ 8.7V
* CV at 8.7V until current drops to 450mA
*
* When battery is >45C:
* CC at 2430mA @ 8.3V
* CV at 8.3V (when battery is hot we don't go to fully charged)
*/
switch (temp_range) {
case TEMP_RANGE_1:
curr->requested_current = 486;
curr->requested_voltage = 8700;
break;
case TEMP_RANGE_2:
curr->requested_current = 1458;
curr->requested_voltage = 8700;
break;
case TEMP_RANGE_3:
curr->requested_voltage = 8700;
if (voltage_range == VOLTAGE_RANGE_HIGH)
curr->requested_current = 2430;
else
curr->requested_current = 3402;
break;
case TEMP_RANGE_4:
curr->requested_voltage = 8700;
if (voltage_range == VOLTAGE_RANGE_HIGH)
curr->requested_current = 2430;
else
curr->requested_current = 4860;
break;
case TEMP_RANGE_5:
curr->requested_current = 2430;
curr->requested_voltage = 8300;
break;
}
return 0;
}
/* Customs options controllable by host command. */
#define PARAM_FASTCHARGE (CS_PARAM_CUSTOM_PROFILE_MIN + 0)
enum ec_status charger_profile_override_get_param(uint32_t param,
uint32_t *value)
{
if (param == PARAM_FASTCHARGE) {
*value = fast_charging_allowed;
return EC_RES_SUCCESS;
}
return EC_RES_INVALID_PARAM;
}
enum ec_status charger_profile_override_set_param(uint32_t param,
uint32_t value)
{
if (param == PARAM_FASTCHARGE) {
fast_charging_allowed = value;
return EC_RES_SUCCESS;
}
return EC_RES_INVALID_PARAM;
}
static int command_fastcharge(int argc, char **argv)
{
if (argc > 1 && !parse_bool(argv[1], &fast_charging_allowed))
return EC_ERROR_PARAM1;
ccprintf("fastcharge %s\n", fast_charging_allowed ? "on" : "off");
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(fastcharge, command_fastcharge,
"[on|off]",
"Get or set fast charging profile");
#endif /* CONFIG_CHARGER_PROFILE_OVERRIDE */
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