131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/* Copyright 2018 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Placeholder values for temporary battery pack.
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*/
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#include "battery.h"
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#include "battery_smart.h"
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#include "charge_state.h"
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#include "console.h"
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#include "ec_commands.h"
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#include "extpower.h"
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#include "gpio.h"
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#include "util.h"
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static enum battery_present batt_pres_prev = BP_NOT_SURE;
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/* Shutdown mode parameters to write to manufacturer access register */
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#define SB_SHIP_MODE_REG SB_MANUFACTURER_ACCESS
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#define SB_SHUTDOWN_DATA 0x0010
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static const struct battery_info info = {
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.voltage_max = 13200,
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.voltage_normal = 11550,
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.voltage_min = 9000,
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/* Pre-charge values. */
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.precharge_current = 256, /* mA */
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.start_charging_min_c = 0,
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.start_charging_max_c = 45,
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.charging_min_c = 0,
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.charging_max_c = 60,
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.discharging_min_c = 0,
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.discharging_max_c = 60,
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};
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const struct battery_info *battery_get_info(void)
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{
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return &info;
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}
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int board_cut_off_battery(void)
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{
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int rv;
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/* Ship mode command must be sent twice to take effect */
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rv = sb_write(SB_SHIP_MODE_REG, SB_SHUTDOWN_DATA);
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if (rv != EC_SUCCESS)
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return rv;
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return sb_write(SB_SHIP_MODE_REG, SB_SHUTDOWN_DATA);
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}
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enum battery_present battery_hw_present(void)
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{
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/* The GPIO is low when the battery is physically present */
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return gpio_get_level(GPIO_BATT_PRES_L) ? BP_NO : BP_YES;
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}
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static int battery_init(void)
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{
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int batt_status;
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return battery_status(&batt_status) ? 0 :
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!!(batt_status & STATUS_INITIALIZED);
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}
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/*
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* Check for case where both XCHG and XDSG bits are set indicating that even
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* though the FG can be read from the battery, the battery is not able to be
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* charged or discharged. This situation will happen if a battery disconnect was
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* intiaited via H1 setting the DISCONN signal to the battery. This will put the
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* battery pack into a sleep state and when power is reconnected, the FG can be
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* read, but the battery is still not able to provide power to the system. The
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* calling function returns batt_pres = BP_NO, which instructs the charging
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* state machine to prevent powering up the AP on battery alone which could lead
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* to a brownout event when the battery isn't able yet to provide power to the
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* system. .
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*/
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static int battery_check_disconnect(void)
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{
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int rv;
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uint8_t data[6];
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/* Check if battery charging + discharging is disabled. */
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rv = sb_read_mfgacc(PARAM_OPERATION_STATUS,
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SB_ALT_MANUFACTURER_ACCESS, data, sizeof(data));
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if (rv)
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return BATTERY_DISCONNECT_ERROR;
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if ((data[3] & (BATTERY_DISCHARGING_DISABLED |
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BATTERY_CHARGING_DISABLED)) ==
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(BATTERY_DISCHARGING_DISABLED | BATTERY_CHARGING_DISABLED))
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return BATTERY_DISCONNECTED;
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return BATTERY_NOT_DISCONNECTED;
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}
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enum battery_present battery_is_present(void)
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{
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enum battery_present batt_pres;
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/* Get the physical hardware status */
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batt_pres = battery_hw_present();
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/*
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* Make sure battery status is implemented, I2C transactions are
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* successful & the battery status is initialized to find out if it
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* is a working battery and it is not in the cut-off mode.
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*
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* If battery I2C fails but VBATT is high, battery is booting from
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* cut-off mode.
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*
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* FETs are turned off after Power Shutdown time.
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* The device will wake up when a voltage is applied to PACK.
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* Battery status will be inactive until it is initialized.
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*/
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if (batt_pres == BP_YES && batt_pres_prev != batt_pres &&
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(battery_is_cut_off() != BATTERY_CUTOFF_STATE_NORMAL ||
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battery_check_disconnect() != BATTERY_NOT_DISCONNECTED ||
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battery_init() == 0)) {
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batt_pres = BP_NO;
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}
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batt_pres_prev = batt_pres;
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return batt_pres;
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}
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