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/* Copyright 2016 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 "bd9995x.h"
#include "charge_state.h"
#include "console.h"
#include "ec_commands.h"
#include "extpower.h"
#include "gpio.h"
#include "util.h"
/* Shutdown mode parameter to write to manufacturer access register */
#define SB_SHUTDOWN_DATA 0x0010
static enum battery_present batt_pres_prev = BP_NOT_SURE;
/* Battery info for proto */
static const struct battery_info info = {
.voltage_max = 8800, /* mV */
.voltage_normal = 7700,
.voltage_min = 6100, /* Add 100mV for charger accuracy */
.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;
/* Ship mode command must be sent twice to take effect */
rv = sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA);
if (rv != EC_SUCCESS)
return EC_RES_ERROR;
rv = sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA);
return rv ? EC_RES_ERROR : EC_RES_SUCCESS;
}
enum battery_disconnect_state battery_get_disconnect_state(void)
{
uint8_t data[6];
int rv;
/*
* Take note if we find that the battery isn't in disconnect state,
* and always return NOT_DISCONNECTED without probing the battery.
* This assumes the battery will not go to disconnect state during
* runtime.
*/
static int not_disconnected;
if (not_disconnected)
return BATTERY_NOT_DISCONNECTED;
if (extpower_is_present()) {
/* 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)) {
not_disconnected = 1;
return BATTERY_NOT_DISCONNECTED;
}
/*
* Battery is neither charging nor discharging. Verify that
* we didn't enter this state due to a safety fault.
*/
rv = sb_read_mfgacc(PARAM_SAFETY_STATUS,
SB_ALT_MANUFACTURER_ACCESS, data, sizeof(data));
if (rv || data[2] || data[3] || data[4] || data[5])
return BATTERY_DISCONNECT_ERROR;
/*
* Battery is present and also the status is initialized and
* no safety fault, battery is disconnected.
*/
if (battery_is_present() == BP_YES)
return BATTERY_DISCONNECTED;
}
not_disconnected = 1;
return BATTERY_NOT_DISCONNECTED;
}
int charger_profile_override(struct charge_state_data *curr)
{
const struct battery_info *batt_info;
/* battery temp in 0.1 deg C */
int bat_temp_c = curr->batt.temperature - 2731;
batt_info = battery_get_info();
/* Don't charge if outside of allowable temperature range */
if (bat_temp_c >= batt_info->charging_max_c * 10 ||
bat_temp_c < batt_info->charging_min_c * 10) {
curr->requested_current = 0;
curr->requested_voltage = 0;
curr->batt.flags &= ~BATT_FLAG_WANT_CHARGE;
curr->state = ST_IDLE;
}
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;
}
static inline 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);
}
/*
* Physical detection of battery.
*/
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
* success & 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_init()) {
batt_pres = BP_NO;
}
batt_pres_prev = batt_pres;
return batt_pres;
}
int board_battery_initialized(void)
{
return battery_hw_present() == batt_pres_prev;
}
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