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/* Copyright 2018 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
static const struct battery_info info = {
.voltage_max = 13200,
.voltage_normal = 11550,
.voltage_min = 9000,
/* Pre-charge values. */
.precharge_current = 256, /* mA */
.start_charging_min_c = 0,
.start_charging_max_c = 45,
.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;
/* 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);
}
enum battery_present battery_hw_present(void)
{
/* The GPIO is low when the battery is physically present */
return gpio_get_level(GPIO_BATT_PRES_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 will happen if a battery disconnect was
* intiaited via H1 setting the DISCONN signal to the battery. This will put the
* battery pack into a sleep state and when power is reconnected, 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;
uint8_t data[6];
/* Check if battery charging + discharging is disabled. */
rv = sb_read_mfgacc(PARAM_OPERATION_STATUS,
SB_ALT_MANUFACTURER_ACCESS, data, sizeof(data));
if (rv)
return BATTERY_DISCONNECT_ERROR;
if ((data[3] & (BATTERY_DISCHARGING_DISABLED |
BATTERY_CHARGING_DISABLED)) ==
(BATTERY_DISCHARGING_DISABLED | BATTERY_CHARGING_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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