int charger_set_current(int current)
{
current = charger_closest_current(current);
return i2c_write16(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_CHARGE_CURRENT, CURRENT_TO_REG(current, R_SNS));
}
/**
* Idle state handler
*
* - both charger and battery are online
* - detect charger and battery status change
* - new states: CHARGE, INIT
*/
static enum charge_state state_idle(struct charge_state_context *ctx)
{
struct batt_params *batt = &ctx->curr.batt;
/* If we are forcing idle mode, then just stay in IDLE. */
if (state_machine_force_idle)
return PWR_STATE_UNCHANGE;
if (!ctx->curr.ac)
return PWR_STATE_REINIT;
if (ctx->curr.error)
return PWR_STATE_ERROR;
/* Prevent charging in idle mode */
if (ctx->curr.charging_voltage ||
ctx->curr.charging_current)
return PWR_STATE_REINIT;
if (batt->state_of_charge >= BATTERY_LEVEL_FULL)
return PWR_STATE_UNCHANGE;
/* Configure init charger state and switch to charge state */
if (batt->flags & BATT_FLAG_WANT_CHARGE) {
int want_current =
charger_closest_current(batt->desired_current);
CPRINTS("Charge start %dmV %dmA",
batt->desired_voltage, want_current);
if (charge_request(batt->desired_voltage, want_current))
return PWR_STATE_ERROR;
update_charger_time(ctx, get_time());
if (ctx->curr.batt.state_of_charge < BATTERY_LEVEL_NEAR_FULL)
return PWR_STATE_CHARGE;
else
return PWR_STATE_CHARGE_NEAR_FULL;
}
return PWR_STATE_UNCHANGE;
}
int charger_set_current(int current)
{
current = charger_closest_current(current);
return sbc_write(SB_CHARGING_CURRENT, CURRENT_TO_REG(current, R_SNS));
}
/* Main loop */
void charger_task(void)
{
int sleep_usec;
int need_static = 1;
const struct charger_info * const info = charger_get_info();
/* Get the battery-specific values */
batt_info = battery_get_info();
prev_ac = prev_charge = -1;
chg_ctl_mode = CHARGE_CONTROL_NORMAL;
shutdown_warning_time.val = 0UL;
battery_seems_to_be_dead = 0;
/*
* If system is not locked and we don't have a battery to live on,
* then use max input current limit so that we can pull as much power
* as needed.
*/
battery_get_params(&curr.batt);
prev_bp = curr.batt.is_present;
curr.desired_input_current = get_desired_input_current(prev_bp, info);
while (1) {
#ifdef CONFIG_SB_FIRMWARE_UPDATE
if (sb_fw_update_in_progress()) {
task_wait_event(CHARGE_MAX_SLEEP_USEC);
continue;
}
#endif
/* Let's see what's going on... */
curr.ts = get_time();
sleep_usec = 0;
problems_exist = 0;
curr.ac = extpower_is_present();
if (curr.ac != prev_ac) {
if (curr.ac) {
/*
* Some chargers are unpowered when the AC is
* off, so we'll reinitialize it when AC
* comes back and set the input current limit.
* Try again if it fails.
*/
int rv = charger_post_init();
if (rv != EC_SUCCESS) {
problem(PR_POST_INIT, rv);
} else {
if (curr.desired_input_current !=
CHARGE_CURRENT_UNINITIALIZED)
rv = charger_set_input_current(
curr.desired_input_current);
if (rv != EC_SUCCESS)
problem(PR_SET_INPUT_CURR, rv);
else
prev_ac = curr.ac;
}
} else {
/* Some things are only meaningful on AC */
chg_ctl_mode = CHARGE_CONTROL_NORMAL;
battery_seems_to_be_dead = 0;
prev_ac = curr.ac;
}
}
charger_get_params(&curr.chg);
battery_get_params(&curr.batt);
if (prev_bp != curr.batt.is_present) {
prev_bp = curr.batt.is_present;
/* Update battery info due to change of battery */
batt_info = battery_get_info();
need_static = 1;
curr.desired_input_current =
get_desired_input_current(prev_bp, info);
if (curr.desired_input_current !=
CHARGE_CURRENT_UNINITIALIZED)
charger_set_input_current(
curr.desired_input_current);
hook_notify(HOOK_BATTERY_SOC_CHANGE);
}
/*
* TODO(crosbug.com/p/27527). Sometimes the battery thinks its
* temperature is 6280C, which seems a bit high. Let's ignore
* anything above the boiling point of tungsten until this bug
* is fixed. If the battery is really that warm, we probably
* have more urgent problems.
*/
if (curr.batt.temperature > CELSIUS_TO_DECI_KELVIN(5660)) {
CPRINTS("ignoring ridiculous batt.temp of %dC",
DECI_KELVIN_TO_CELSIUS(curr.batt.temperature));
curr.batt.flags |= BATT_FLAG_BAD_TEMPERATURE;
}
/* If the battery thinks it's above 100%, don't believe it */
if (curr.batt.state_of_charge > 100) {
CPRINTS("ignoring ridiculous batt.soc of %d%%",
curr.batt.state_of_charge);
curr.batt.flags |= BATT_FLAG_BAD_STATE_OF_CHARGE;
}
/*
* Now decide what we want to do about it. We'll normally just
* pass along whatever the battery wants to the charger. Note
* that if battery_get_params() can't get valid values from the
* battery it uses (0, 0), which is probably safer than blindly
* applying power to a battery we can't talk to.
*/
curr.requested_voltage = curr.batt.desired_voltage;
curr.requested_current = curr.batt.desired_current;
/* If we *know* there's no battery, wait for one to appear. */
if (curr.batt.is_present == BP_NO) {
ASSERT(curr.ac); /* How are we running? */
curr.state = ST_IDLE;
curr.batt_is_charging = 0;
battery_was_removed = 1;
goto wait_for_it;
}
/*
* If we had trouble talking to the battery or the charger, we
* should probably do nothing for a bit, and if it doesn't get
* better then flag it as an error.
*/
if (curr.chg.flags & CHG_FLAG_BAD_ANY)
problem(PR_CHG_FLAGS, curr.chg.flags);
if (curr.batt.flags & BATT_FLAG_BAD_ANY)
problem(PR_BATT_FLAGS, curr.batt.flags);
/*
* If AC is present, check if input current is sufficient to
* actually charge battery.
*/
curr.batt_is_charging = curr.ac && (curr.batt.current >= 0);
/* Don't let the battery hurt itself. */
shutdown_on_critical_battery();
if (!curr.ac) {
curr.state = ST_DISCHARGE;
goto wait_for_it;
}
/* Okay, we're on AC and we should have a battery. */
/* Used for factory tests. */
if (chg_ctl_mode != CHARGE_CONTROL_NORMAL) {
curr.state = ST_IDLE;
goto wait_for_it;
}
/* If the battery is not responsive, try to wake it up. */
if (!(curr.batt.flags & BATT_FLAG_RESPONSIVE)) {
if (battery_seems_to_be_dead || battery_is_cut_off()) {
/* It's dead, do nothing */
curr.state = ST_IDLE;
curr.requested_voltage = 0;
curr.requested_current = 0;
} else if (curr.state == ST_PRECHARGE &&
(get_time().val > precharge_start_time.val +
PRECHARGE_TIMEOUT_US)) {
/* We've tried long enough, give up */
CPRINTS("battery seems to be dead");
battery_seems_to_be_dead = 1;
curr.state = ST_IDLE;
curr.requested_voltage = 0;
curr.requested_current = 0;
} else {
/* See if we can wake it up */
if (curr.state != ST_PRECHARGE) {
CPRINTS("try to wake battery");
precharge_start_time = get_time();
need_static = 1;
}
curr.state = ST_PRECHARGE;
curr.requested_voltage =
batt_info->voltage_max;
curr.requested_current =
batt_info->precharge_current;
}
goto wait_for_it;
} else {
/* The battery is responding. Yay. Try to use it. */
#ifdef CONFIG_BATTERY_REQUESTS_NIL_WHEN_DEAD
/*
* TODO (crosbug.com/p/29467): remove this workaround
* for dead battery that requests no voltage/current
*/
if (curr.requested_voltage == 0 &&
curr.requested_current == 0 &&
curr.batt.state_of_charge == 0) {
/* Battery is dead, give precharge current */
curr.requested_voltage =
batt_info->voltage_max;
curr.requested_current =
batt_info->precharge_current;
} else
#endif
#ifdef CONFIG_BATTERY_REVIVE_DISCONNECT
battery_seems_to_be_disconnected = 0;
if (curr.requested_voltage == 0 &&
curr.requested_current == 0 &&
battery_get_disconnect_state() ==
BATTERY_DISCONNECTED) {
/*
* Battery is in disconnect state. Apply a
* current to kick it out of this state.
*/
CPRINTS("found battery in disconnect state");
curr.requested_voltage =
batt_info->voltage_max;
curr.requested_current =
batt_info->precharge_current;
battery_seems_to_be_disconnected = 1;
} else
#endif
if (curr.state == ST_PRECHARGE ||
battery_seems_to_be_dead ||
battery_was_removed) {
CPRINTS("battery woke up");
/* Update the battery-specific values */
batt_info = battery_get_info();
need_static = 1;
}
battery_seems_to_be_dead = battery_was_removed = 0;
curr.state = ST_CHARGE;
}
/*
* TODO(crosbug.com/p/27643): Quit trying if charging too long
* without getting full (CONFIG_CHARGER_TIMEOUT_HOURS).
*/
wait_for_it:
#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
sleep_usec = charger_profile_override(&curr);
if (sleep_usec < 0)
problem(PR_CUSTOM, sleep_usec);
#endif
/* Keep the AP informed */
if (need_static)
need_static = update_static_battery_info();
/* Wait on the dynamic info until the static info is good. */
if (!need_static)
update_dynamic_battery_info();
notify_host_of_low_battery();
/* And the EC console */
is_full = calc_is_full();
if ((!(curr.batt.flags & BATT_FLAG_BAD_STATE_OF_CHARGE) &&
curr.batt.state_of_charge != prev_charge) ||
(is_full != prev_full)) {
show_charging_progress();
prev_charge = curr.batt.state_of_charge;
hook_notify(HOOK_BATTERY_SOC_CHANGE);
}
prev_full = is_full;
/* Turn charger off if it's not needed */
if (curr.state == ST_IDLE || curr.state == ST_DISCHARGE) {
curr.requested_voltage = 0;
curr.requested_current = 0;
}
/* Apply external limits */
if (curr.requested_current > user_current_limit)
curr.requested_current = user_current_limit;
/* Round to valid values */
curr.requested_voltage =
charger_closest_voltage(curr.requested_voltage);
curr.requested_current =
charger_closest_current(curr.requested_current);
/* Charger only accpets request when AC is on. */
if (curr.ac) {
/*
* Some batteries would wake up after cut-off if we keep
* charging it. Thus, we only charge when AC is on and
* battery is not cut off yet.
*/
if (battery_is_cut_off())
charge_request(0, 0);
/*
* As a safety feature, some chargers will stop
* charging if we don't communicate with it frequently
* enough. In manual mode, we'll just tell it what it
* knows.
*/
else if (manual_mode) {
charge_request(curr.chg.voltage,
curr.chg.current);
} else {
charge_request(curr.requested_voltage,
curr.requested_current);
}
} else {
charge_request(
charger_closest_voltage(
curr.batt.voltage + info->voltage_step), -1);
}
/* How long to sleep? */
if (problems_exist)
/* If there are errors, don't wait very long. */
sleep_usec = CHARGE_POLL_PERIOD_SHORT;
else if (sleep_usec <= 0) {
/* default values depend on the state */
if (curr.state == ST_IDLE ||
curr.state == ST_DISCHARGE) {
/* If AP is off, we can sleep a long time */
if (chipset_in_state(CHIPSET_STATE_ANY_OFF |
CHIPSET_STATE_SUSPEND))
sleep_usec =
CHARGE_POLL_PERIOD_VERY_LONG;
else
/* Discharging, not too urgent */
sleep_usec = CHARGE_POLL_PERIOD_LONG;
} else {
/* Charging, so pay closer attention */
sleep_usec = CHARGE_POLL_PERIOD_CHARGE;
}
}
/* Adjust for time spent in this loop */
sleep_usec -= (int)(get_time().val - curr.ts.val);
if (sleep_usec < CHARGE_MIN_SLEEP_USEC)
sleep_usec = CHARGE_MIN_SLEEP_USEC;
else if (sleep_usec > CHARGE_MAX_SLEEP_USEC)
sleep_usec = CHARGE_MAX_SLEEP_USEC;
task_wait_event(sleep_usec);
}
}
static int charge_command_charge_state(struct host_cmd_handler_args *args)
{
const struct ec_params_charge_state *in = args->params;
struct ec_response_charge_state *out = args->response;
uint32_t val;
int rv = EC_RES_SUCCESS;
switch (in->cmd) {
case CHARGE_STATE_CMD_GET_STATE:
out->get_state.ac = curr.ac;
out->get_state.chg_voltage = curr.chg.voltage;
out->get_state.chg_current = curr.chg.current;
out->get_state.chg_input_current = curr.chg.input_current;
out->get_state.batt_state_of_charge = curr.batt.state_of_charge;
args->response_size = sizeof(out->get_state);
break;
case CHARGE_STATE_CMD_GET_PARAM:
val = 0;
#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
/* custom profile params */
if (in->get_param.param >= CS_PARAM_CUSTOM_PROFILE_MIN &&
in->get_param.param <= CS_PARAM_CUSTOM_PROFILE_MAX) {
rv = charger_profile_override_get_param(
in->get_param.param, &val);
} else
#endif
/* standard params */
switch (in->get_param.param) {
case CS_PARAM_CHG_VOLTAGE:
val = curr.chg.voltage;
break;
case CS_PARAM_CHG_CURRENT:
val = curr.chg.current;
break;
case CS_PARAM_CHG_INPUT_CURRENT:
val = curr.chg.input_current;
break;
case CS_PARAM_CHG_STATUS:
val = curr.chg.status;
break;
case CS_PARAM_CHG_OPTION:
val = curr.chg.option;
break;
case CS_PARAM_LIMIT_POWER:
#ifdef CONFIG_CHARGER_LIMIT_POWER_THRESH_BAT_PCT
/*
* LIMIT_POWER status is based on battery level
* and external charger power.
*/
if ((curr.batt.is_present != BP_YES ||
curr.batt.state_of_charge <
CONFIG_CHARGER_LIMIT_POWER_THRESH_BAT_PCT)
&& charge_manager_get_power_limit_uw() <
CONFIG_CHARGER_LIMIT_POWER_THRESH_CHG_MW
* 1000 && system_is_locked())
val = 1;
else
#endif
val = 0;
break;
default:
rv = EC_RES_INVALID_PARAM;
}
/* got something */
out->get_param.value = val;
args->response_size = sizeof(out->get_param);
break;
case CHARGE_STATE_CMD_SET_PARAM:
val = in->set_param.value;
#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
/* custom profile params */
if (in->set_param.param >= CS_PARAM_CUSTOM_PROFILE_MIN &&
in->set_param.param <= CS_PARAM_CUSTOM_PROFILE_MAX) {
rv = charger_profile_override_set_param(
in->set_param.param, val);
} else
#endif
switch (in->set_param.param) {
case CS_PARAM_CHG_VOLTAGE:
val = charger_closest_voltage(val);
if (charge_request(val, -1))
rv = EC_RES_ERROR;
manual_mode = 1;
break;
case CS_PARAM_CHG_CURRENT:
val = charger_closest_current(val);
if (charge_request(-1, val))
rv = EC_RES_ERROR;
manual_mode = 1;
break;
case CS_PARAM_CHG_INPUT_CURRENT:
if (charger_set_input_current(val))
rv = EC_RES_ERROR;
break;
case CS_PARAM_CHG_STATUS:
case CS_PARAM_LIMIT_POWER:
/* Can't set this */
rv = EC_RES_ACCESS_DENIED;
break;
case CS_PARAM_CHG_OPTION:
if (charger_set_option(val))
rv = EC_RES_ERROR;
break;
default:
rv = EC_RES_INVALID_PARAM;
}
break;
default:
CPRINTS("EC_CMD_CHARGE_STATE: bad cmd 0x%x", in->cmd);
rv = EC_RES_INVALID_PARAM;
}
return rv;
}
/**
* Charge state handler
*
* - detect battery status change
* - new state: INIT
*/
static enum charge_state state_charge(struct charge_state_context *ctx)
{
struct charge_state_data *curr = &ctx->curr;
struct batt_params *batt = &ctx->curr.batt;
int debounce = 0;
int want_current;
int want_voltage;
timestamp_t now;
if (curr->error)
return PWR_STATE_ERROR;
/*
* Some chargers will reset out from underneath us. If this happens,
* reinitialize charging.
*/
if (curr->charging_voltage == 0 ||
curr->charging_current == 0)
return PWR_STATE_REINIT;
if (!curr->ac)
return PWR_STATE_REINIT;
/* Stop charging if charging is no longer allowed */
if (!(batt->flags & BATT_FLAG_WANT_CHARGE)) {
if (charge_request(0, 0))
return PWR_STATE_ERROR;
return PWR_STATE_IDLE;
}
now = get_time();
/*
* Adjust desired voltage to one the charger can actually supply
* or else we'll keep asking for a voltage the charger can't actually
* supply.
*/
want_voltage = charger_closest_voltage(batt->desired_voltage);
if (want_voltage != curr->charging_voltage) {
CPRINTS("Charge voltage %dmV", want_voltage);
if (charge_request(want_voltage, -1))
return PWR_STATE_ERROR;
update_charger_time(ctx, now);
}
/*
* Adjust desired current to one the charger can actually supply before
* we do debouncing, or else we'll keep asking for a current the
* charger can't actually supply.
*/
want_current = charger_closest_current(batt->desired_current);
if (want_current == curr->charging_current) {
/* Tick charger watchdog */
if (!is_charger_expired(ctx, now))
return PWR_STATE_UNCHANGE;
} else if (want_current > curr->charging_current) {
if (!timestamp_expired(ctx->voltage_debounce_time, &now))
return PWR_STATE_UNCHANGE;
} else {
debounce = 1;
}
if (want_current != curr->charging_current) {
CPRINTS("Charge current %dmA @ %dmV",
want_current, batt->desired_voltage);
}
if (charge_request(-1, want_current))
return PWR_STATE_ERROR;
/* Update charger watchdog timer and debounce timer */
update_charger_time(ctx, now);
if (debounce)
ctx->voltage_debounce_time.val = now.val + DEBOUNCE_TIME;
return PWR_STATE_UNCHANGE;
}
int charger_set_current(int current)
{
current = charger_closest_current(current);
return raw_write16(REG_CHARGE_CURRENT, CURRENT_TO_REG(current, R_SNS));
}
