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/* Copyright (c) 2012 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_smart.h"
#include "charge_state.h"
#include "console.h"
#include "ec_commands.h"
#include "extpower.h"
#include "util.h"
static const struct battery_info info = {
/*
* Design voltage
* max = 8.4V
* normal = 7.4V
* min = 6.0V
*/
.voltage_max = 8400,
.voltage_normal = 7400,
.voltage_min = 6000,
/* Pre-charge current: I <= 0.01C */
.precharge_current = 64, /* mA */
/*
* Operational temperature range
* 0 <= T_charge <= 50 deg C
* -20 <= T_discharge <= 60 deg C
*/
.start_charging_min_c = 0,
.start_charging_max_c = 50,
.charging_min_c = 0,
.charging_max_c = 50,
.discharging_min_c = -20,
.discharging_max_c = 60,
};
const struct battery_info *battery_get_info(void)
{
return &info;
}
#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
static int fast_charging_allowed;
/*
* 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)
{
/* We only want to override how we charge, nothing else. */
if (curr->state != ST_CHARGE)
return 0;
/* Do we want to mess with the charge profile too? */
if (!fast_charging_allowed)
return 0;
/* Okay, impose our custom will */
curr->requested_current = 9000;
curr->requested_voltage = 8300;
if (curr->batt.current <= 6300) {
curr->requested_current = 6300;
curr->requested_voltage = 8400;
} else if (curr->batt.current <= 4500) {
curr->requested_current = 4500;
curr->requested_voltage = 8500;
} else if (curr->batt.current <= 2700) {
curr->requested_current = 2700;
curr->requested_voltage = 8700;
} else if (curr->batt.current <= 475) {
/*
* Should we stop? If so, how do we start again?
* For now, just use the battery's profile.
*/
curr->requested_current = curr->batt.desired_current;
curr->requested_voltage = curr->batt.desired_voltage;
}
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",
NULL);
#endif /* CONFIG_CHARGER_PROFILE_OVERRIDE */
#ifdef CONFIG_BATTERY_REVIVE_DISCONNECT
/*
* Check if battery is in disconnect state, a state entered by pulling
* BATT_DISCONN_N low, and clear that state if we have external power plugged
* and no battery faults are detected. Disconnect state resembles battery
* shutdown mode, but extra steps must be taken to get the battery out of this
* mode.
*/
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_write(SB_MANUFACTURER_ACCESS, PARAM_OPERATION_STATUS);
if (rv)
return BATTERY_DISCONNECT_ERROR;
rv = sb_read_string(I2C_PORT_BATTERY, BATTERY_ADDR,
SB_ALT_MANUFACTURER_ACCESS, data, 6);
if (rv || !(data[3] & BATTERY_DISCHARGING_DISABLED) ||
!(data[3] & 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_write(SB_MANUFACTURER_ACCESS, PARAM_SAFETY_STATUS);
if (rv)
return BATTERY_DISCONNECT_ERROR;
rv = sb_read_string(I2C_PORT_BATTERY, BATTERY_ADDR,
SB_ALT_MANUFACTURER_ACCESS, data, 6);
if (rv || data[2] || data[3] || data[4] || data[5])
return BATTERY_DISCONNECT_ERROR;
else
/* No safety fault -- clear disconnect state. */
return BATTERY_DISCONNECTED;
}
not_disconnected = 1;
return BATTERY_NOT_DISCONNECTED;
}
#endif /* CONFIG_BATTERY_REVIVE_DISCONNECT */
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