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/* Copyright 2017 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.
*
* Placeholder values for temporary battery pack.
*/
#include "battery.h"
#include "battery_smart.h"
#include "charge_state.h"
#include "console.h"
#include "ec_commands.h"
#include "extpower.h"
#include "gpio.h"
#include "util.h"
static enum battery_present batt_pres_prev = BP_NOT_SURE;
/* Shutdown mode parameters to write to manufacturer access register */
#define SB_SHIP_MODE_REG SB_MANUFACTURER_ACCESS
#define SB_SHUTDOWN_DATA 0x0010
/*
* Unlike other smart batteries, Nautilus battery uses different bit fields
* in manufacturer access register for the conditions of the CHG/DSG FETs.
*/
#define BATFETS_SHIFT (14)
#define BATFETS_MASK (0x3)
#define BATFETS_DISABLED (0x2)
#define CHARGING_VOLTAGE_MV_SAFE 8400
#define CHARGING_CURRENT_MA_SAFE 1500
static const struct battery_info info = {
.voltage_max = 8700,
.voltage_normal = 7700,
.voltage_min = 6000,
/* Pre-charge values. */
.precharge_current = 200, /* mA */
.start_charging_min_c = 0,
.start_charging_max_c = 45,
.charging_min_c = 0,
.charging_max_c = 50,
.discharging_min_c = -20,
.discharging_max_c = 70,
};
const struct battery_info *battery_get_info(void)
{
return &info;
}
int board_cut_off_battery(void)
{
int rv;
/* Ship mode command must be sent twice to take effect */
rv = sb_write(SB_SHIP_MODE_REG, SB_SHUTDOWN_DATA);
if (rv != EC_SUCCESS)
return rv;
return sb_write(SB_SHIP_MODE_REG, SB_SHUTDOWN_DATA);
}
int charger_profile_override(struct charge_state_data *curr)
{
int current;
int voltage;
/* battery temp in 0.1 deg C */
int bat_temp_c;
/*
* Keep track of battery temperature range:
*
* ZONE_0 ZONE_1 ZONE_2 ZONE_3
* ---+------+--------+--------+------+--- Temperature (C)
* 0 5 12 45 50
*/
enum {
TEMP_ZONE_0, /* 0 <= bat_temp_c <= 5 */
TEMP_ZONE_1, /* 5 < bat_temp_c <= 12 */
TEMP_ZONE_2, /* 12 < bat_temp_c <= 45 */
TEMP_ZONE_3, /* 45 < bat_temp_c <= 50 */
TEMP_ZONE_COUNT,
TEMP_OUT_OF_RANGE = TEMP_ZONE_COUNT
} temp_zone;
current = curr->requested_current;
voltage = curr->requested_voltage;
bat_temp_c = curr->batt.temperature - 2731;
/*
* If the temperature reading is bad, assume the temperature
* is out of allowable range.
*/
if ((curr->batt.flags & BATT_FLAG_BAD_TEMPERATURE) ||
(bat_temp_c < 0) || (bat_temp_c > 500))
temp_zone = TEMP_OUT_OF_RANGE;
else if (bat_temp_c <= 50)
temp_zone = TEMP_ZONE_0;
else if (bat_temp_c <= 120)
temp_zone = TEMP_ZONE_1;
else if (bat_temp_c <= 450)
temp_zone = TEMP_ZONE_2;
else
temp_zone = TEMP_ZONE_3;
switch (temp_zone) {
case TEMP_ZONE_0:
voltage = CHARGING_VOLTAGE_MV_SAFE;
current = CHARGING_CURRENT_MA_SAFE;
break;
case TEMP_ZONE_1:
current = CHARGING_CURRENT_MA_SAFE;
break;
case TEMP_ZONE_2:
break;
case TEMP_ZONE_3:
voltage = CHARGING_VOLTAGE_MV_SAFE;
break;
case TEMP_OUT_OF_RANGE:
/* Don't charge if outside of allowable temperature range */
current = 0;
voltage = 0;
curr->batt.flags &= ~BATT_FLAG_WANT_CHARGE;
curr->state = ST_IDLE;
break;
}
curr->requested_voltage = MIN(curr->requested_voltage, voltage);
curr->requested_current = MIN(curr->requested_current, current);
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)
{
return EC_RES_INVALID_PARAM;
}
enum ec_status charger_profile_override_set_param(uint32_t param,
uint32_t value)
{
return EC_RES_INVALID_PARAM;
}
enum battery_present battery_hw_present(void)
{
/* The GPIO is low when the battery is physically present */
return gpio_get_level(GPIO_BATTERY_PRESENT_L) ? BP_NO : BP_YES;
}
static int battery_init(void)
{
int batt_status;
return battery_status(&batt_status) ? 0 :
!!(batt_status & STATUS_INITIALIZED);
}
/*
* Check for case where both XCHG and XDSG bits are set indicating that even
* though the FG can be read from the battery, the battery is not able to be
* charged or discharged. This situation might happen when power is reconnected
* to a battery pack in sleep mode. In this transient siuation, the FG can be
* read, but the battery is still not able to provide power to the system. The
* calling function returns batt_pres = BP_NO, which instructs the charging
* state machine to prevent powering up the AP on battery alone which could lead
* to a brownout event when the battery isn't able yet to provide power to the
* system.
*/
static int battery_check_disconnect(void)
{
int rv;
int batt_mfgacc;
/* Check if battery charging + discharging is disabled. */
rv = sb_read(SB_MANUFACTURER_ACCESS, &batt_mfgacc);
if (rv)
return BATTERY_DISCONNECT_ERROR;
if (((batt_mfgacc >> BATFETS_SHIFT) & BATFETS_MASK) ==
BATFETS_DISABLED)
return BATTERY_DISCONNECTED;
return BATTERY_NOT_DISCONNECTED;
}
enum battery_present battery_is_present(void)
{
enum battery_present batt_pres;
/* Get the physical hardware status */
batt_pres = battery_hw_present();
/*
* Make sure battery status is implemented, I2C transactions are
* successful & the battery status is initialized to find out if it
* is a working battery and it is not in the cut-off mode.
*
* If battery I2C fails but VBATT is high, battery is booting from
* cut-off mode.
*
* FETs are turned off after Power Shutdown time.
* The device will wake up when a voltage is applied to PACK.
* Battery status will be inactive until it is initialized.
*/
if (batt_pres == BP_YES && batt_pres_prev != batt_pres &&
(battery_is_cut_off() != BATTERY_CUTOFF_STATE_NORMAL ||
battery_check_disconnect() != BATTERY_NOT_DISCONNECTED ||
battery_init() == 0)) {
batt_pres = BP_NO;
}
batt_pres_prev = batt_pres;
return batt_pres;
}
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