static int battery_discharging_range(int deci_k)
{
int8_t temp_c = DECI_KELVIN_TO_CELSIUS(deci_k);
const struct battery_info *info = battery_get_info();
return (temp_c >= info->discharging_min_c &&
temp_c < info->discharging_max_c);
}
int charge_temp_sensor_get_val(int idx, int *temp_ptr)
{
const struct batt_params *batt = &task_ctx.curr.batt;
if (!(batt->flags & BATT_FLAG_RESPONSIVE))
return EC_ERROR_UNKNOWN;
*temp_ptr = C_TO_K(DECI_KELVIN_TO_CELSIUS(batt->temperature));
return EC_SUCCESS;
}
/*
* Send host event to the AP if the battery is temperature or charge level
* is critical. Force-shutdown if the problem isn't corrected after timeout.
*/
static void shutdown_on_critical_battery(void)
{
int batt_temp_c;
int battery_critical = 0;
/*
* TODO(crosbug.com/p/27642): The thermal loop should watch the battery
* temp, so it can turn fans on.
*/
batt_temp_c = DECI_KELVIN_TO_CELSIUS(curr.batt.temperature);
if (battery_too_hot(batt_temp_c)) {
CPRINTS("Batt temp out of range: %dC", batt_temp_c);
battery_critical = 1;
}
if (battery_too_low() && !curr.batt_is_charging) {
CPRINTS("Low battery: %d%%, %dmV",
curr.batt.state_of_charge, curr.batt.voltage);
battery_critical = 1;
}
if (!battery_critical) {
/* Reset shutdown warning time */
shutdown_warning_time.val = 0;
return;
}
if (!shutdown_warning_time.val) {
CPRINTS("charge warn shutdown due to critical battery");
shutdown_warning_time = get_time();
if (!chipset_in_state(CHIPSET_STATE_ANY_OFF))
host_set_single_event(EC_HOST_EVENT_BATTERY_SHUTDOWN);
} else if (get_time().val > shutdown_warning_time.val +
CRITICAL_BATTERY_SHUTDOWN_TIMEOUT_US) {
if (chipset_in_state(CHIPSET_STATE_ANY_OFF)) {
#ifdef CONFIG_HIBERNATE
/* Timeout waiting for charger to provide more power */
CPRINTS(
"charge force EC hibernate due to critical battery");
system_hibernate(0, 0);
#elif defined(CONFIG_BATTERY_CRITICAL_SHUTDOWN_CUT_OFF)
CPRINTS(
"charge force battery cut-off due to critical level");
board_cut_off_battery();
#endif
} else {
/* Timeout waiting for AP to shut down, so kill it */
CPRINTS(
"charge force shutdown due to critical battery");
chipset_force_shutdown();
}
}
}
/**
* Discharge state handler
*
* - detect ac status
* - new state: INIT
*/
static enum charge_state state_discharge(struct charge_state_context *ctx)
{
struct batt_params *batt = &ctx->curr.batt;
int8_t bat_temp_c = DECI_KELVIN_TO_CELSIUS(batt->temperature);
if (ctx->curr.ac)
return PWR_STATE_REINIT;
if (ctx->curr.error)
return PWR_STATE_ERROR;
/* Handle overtemp in discharging state by powering off host */
if ((bat_temp_c >= ctx->battery->discharging_max_c ||
bat_temp_c < ctx->battery->discharging_min_c) &&
chipset_in_state(CHIPSET_STATE_ON)) {
CPRINTS("charge force shutdown due to battery temp");
chipset_force_shutdown();
host_set_single_event(EC_HOST_EVENT_BATTERY_SHUTDOWN);
}
return PWR_STATE_UNCHANGE;
}
static int acpi_thermal_add(struct acpi_device *device)
{
int result = 0;
struct acpi_thermal *tz = NULL;
if (!device)
return -EINVAL;
tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
if (!tz)
return -ENOMEM;
tz->device = device;
strcpy(tz->name, device->pnp.bus_id);
strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
device->driver_data = tz;
result = acpi_thermal_get_info(tz);
if (result)
goto free_memory;
acpi_thermal_guess_offset(tz);
result = acpi_thermal_register_thermal_zone(tz);
if (result)
goto free_memory;
INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
goto end;
free_memory:
kfree(tz);
end:
return result;
}
static void dump_charge_state(void)
{
#define DUMP(FLD, FMT) ccprintf(#FLD " = " FMT "\n", curr.FLD)
#define DUMP_CHG(FLD, FMT) ccprintf("\t" #FLD " = " FMT "\n", curr.chg. FLD)
#define DUMP_BATT(FLD, FMT) ccprintf("\t" #FLD " = " FMT "\n", curr.batt. FLD)
ccprintf("state = %s\n", state_list[curr.state]);
DUMP(ac, "%d");
DUMP(batt_is_charging, "%d");
ccprintf("chg.*:\n");
DUMP_CHG(voltage, "%dmV");
DUMP_CHG(current, "%dmA");
DUMP_CHG(input_current, "%dmA");
DUMP_CHG(status, "0x%x");
DUMP_CHG(option, "0x%x");
DUMP_CHG(flags, "0x%x");
ccprintf("batt.*:\n");
ccprintf("\ttemperature = %dC\n",
DECI_KELVIN_TO_CELSIUS(curr.batt.temperature));
DUMP_BATT(state_of_charge, "%d%%");
DUMP_BATT(voltage, "%dmV");
DUMP_BATT(current, "%dmA");
DUMP_BATT(desired_voltage, "%dmV");
DUMP_BATT(desired_current, "%dmA");
DUMP_BATT(flags, "0x%x");
DUMP_BATT(remaining_capacity, "%dmAh");
DUMP_BATT(full_capacity, "%dmAh");
ccprintf("\tis_present = %s\n", batt_pres[curr.batt.is_present]);
DUMP(requested_voltage, "%dmV");
DUMP(requested_current, "%dmA");
ccprintf("chg_ctl_mode = %d\n", chg_ctl_mode);
ccprintf("manual_mode = %d\n", manual_mode);
ccprintf("user_current_limit = %dmA\n", user_current_limit);
ccprintf("battery_seems_to_be_dead = %d\n", battery_seems_to_be_dead);
ccprintf("battery_seems_to_be_disconnected = %d\n",
battery_seems_to_be_disconnected);
ccprintf("battery_was_removed = %d\n", battery_was_removed);
ccprintf("debug output = %s\n", debugging ? "on" : "off");
#undef DUMP
}
/* 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 calc_next_state(int state)
{
struct batt_params batt;
int alarm;
battery_get_params_and_save_a_copy(&batt);
switch (state) {
case ST_IDLE0:
case ST_BAD_COND:
case ST_IDLE:
/* Check AC and chiset state */
if (!extpower_is_present()) {
if (chipset_in_state(CHIPSET_STATE_ON))
return ST_DISCHARGING;
return ST_IDLE;
}
/* Stay in idle mode if charger overtemp */
if (pmu_is_charger_alarm())
return ST_BAD_COND;
/* Enable charging when battery doesn't respond */
if (!(batt.flags & BATT_FLAG_RESPONSIVE))
return ST_PRE_CHARGING;
/* Turn off charger when battery temperature is out
* of the start charging range.
*/
if (!battery_start_charging_range(batt.temperature))
return ST_BAD_COND;
/* Turn off charger on battery over temperature alarm */
if (battery_status(&alarm) || (alarm & ALARM_OVER_TEMP))
return ST_BAD_COND;
/* Stop charging if the battery says it's charged */
if (alarm & ALARM_CHARGED)
return ST_IDLE;
/* Start charging only when battery charge lower than 100% */
if (!(batt.flags & BATT_FLAG_BAD_STATE_OF_CHARGE)) {
if (batt.state_of_charge < 100)
return ST_CHARGING;
}
return ST_IDLE;
case ST_PRE_CHARGING:
if (!extpower_is_present())
return ST_IDLE0;
/*
* If the battery goes online after enabling the charger, go
* into charging state.
*/
if (batt.flags & BATT_FLAG_RESPONSIVE) {
if (!battery_start_charging_range(batt.temperature))
return ST_IDLE0;
if (!(batt.flags & BATT_FLAG_BAD_STATE_OF_CHARGE)) {
if (batt.state_of_charge >= 100)
return ST_IDLE0;
}
return ST_CHARGING;
}
return ST_PRE_CHARGING;
case ST_CHARGING:
/* Go back to idle state when AC is unplugged */
if (!extpower_is_present())
return ST_IDLE0;
/*
* Disable charging on battery access error, or charging
* temperature out of range.
*/
if (!(batt.flags & BATT_FLAG_RESPONSIVE)) {
CPRINTS("pmu charging: unable to get battery "
"temperature");
return ST_IDLE0;
} else if (!battery_charging_range(batt.temperature)) {
CPRINTS("pmu charging: temperature out of range "
"%dC",
DECI_KELVIN_TO_CELSIUS(batt.temperature));
return ST_CHARGING_ERROR;
}
/*
* Disable charging on battery alarm events or access error:
* - over temperature
* - over current
*/
if (battery_status(&alarm))
return ST_IDLE0;
if (alarm & ALARM_OVER_TEMP) {
CPRINTS("pmu charging: battery over temp");
return ST_CHARGING_ERROR;
}
/* Go to idle state if battery is fully charged */
if (alarm & ALARM_CHARGED)
return ST_IDLE;
/*
* Disable charging on charger alarm events:
* - charger over current
* - charger over temperature
*/
if (pmu_is_charger_alarm()) {
CPRINTS("pmu charging: charger alarm");
return ST_IDLE0;
}
return ST_CHARGING;
case ST_CHARGING_ERROR:
/*
* This state indicates AC is plugged but the battery is not
* charging. The conditions to exit this state:
* - battery detected
* - battery temperature is in start charging range
* - no battery alarm
*/
if (extpower_is_present()) {
if (battery_status(&alarm))
return ST_CHARGING_ERROR;
if (alarm & ALARM_OVER_TEMP)
return ST_CHARGING_ERROR;
if (!(batt.flags & BATT_FLAG_RESPONSIVE))
return ST_CHARGING_ERROR;
if (!battery_charging_range(batt.temperature))
return ST_CHARGING_ERROR;
return ST_CHARGING;
}
return ST_IDLE0;
case ST_DISCHARGING:
/* Go back to idle state when AC is plugged */
if (extpower_is_present())
return ST_IDLE0;
/* Prepare EC sleep after system stopped discharging */
if (chipset_in_state(CHIPSET_STATE_ANY_OFF))
return ST_IDLE0;
/* Check battery discharging temperature range */
if (batt.flags & BATT_FLAG_RESPONSIVE) {
if (!battery_discharging_range(batt.temperature)) {
CPRINTS("pmu discharging: temperature out of "
"range %dC",
DECI_KELVIN_TO_CELSIUS(
batt.temperature));
return system_off();
}
}
/* Check discharging alarm */
if (!battery_status(&alarm) && (alarm & ALARM_DISCHARGING)) {
CPRINTS("pmu discharging: battery alarm %016b", alarm);
return system_off();
}
/* Check remaining charge % */
if (!(batt.flags & BATT_FLAG_BAD_STATE_OF_CHARGE)) {
/*
* Shutdown AP when state of charge < 1.5%.
* Moving average is rounded to integer.
*/
if (rsoc_moving_average(batt.state_of_charge) < 2)
return system_off();
else if (batt.state_of_charge < 4)
notify_battery_low();
}
return ST_DISCHARGING;
}
return ST_IDLE0;
}
