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android-kvm / linux / 62210f7509e13a2caa7b080722a45229b8f17a0a / . / drivers / power / supply / charger-manager.c
blob: 96f0a7fbf10518c838c36f3c24bbcbe22765b3b1 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2011 Samsung Electronics Co., Ltd.
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This driver enables to monitor battery health and control charger
* during suspend-to-mem.
* Charger manager depends on other devices. Register this later than
* the depending devices.
*
**/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/io.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power/charger-manager.h>
#include <linux/regulator/consumer.h>
#include <linux/sysfs.h>
#include <linux/of.h>
#include <linux/thermal.h>
static struct {
const char *name;
u64 extcon_type;
} extcon_mapping[] = {
/* Current textual representations */
{ "USB", EXTCON_USB },
{ "USB-HOST", EXTCON_USB_HOST },
{ "SDP", EXTCON_CHG_USB_SDP },
{ "DCP", EXTCON_CHG_USB_DCP },
{ "CDP", EXTCON_CHG_USB_CDP },
{ "ACA", EXTCON_CHG_USB_ACA },
{ "FAST-CHARGER", EXTCON_CHG_USB_FAST },
{ "SLOW-CHARGER", EXTCON_CHG_USB_SLOW },
{ "WPT", EXTCON_CHG_WPT },
{ "PD", EXTCON_CHG_USB_PD },
{ "DOCK", EXTCON_DOCK },
{ "JIG", EXTCON_JIG },
{ "MECHANICAL", EXTCON_MECHANICAL },
/* Deprecated textual representations */
{ "TA", EXTCON_CHG_USB_SDP },
{ "CHARGE-DOWNSTREAM", EXTCON_CHG_USB_CDP },
};
/*
* Default temperature threshold for charging.
* Every temperature units are in tenth of centigrade.
*/
#define CM_DEFAULT_RECHARGE_TEMP_DIFF 50
#define CM_DEFAULT_CHARGE_TEMP_MAX 500
/*
* Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
* delayed works so that we can run delayed works with CM_JIFFIES_SMALL
* without any delays.
*/
#define CM_JIFFIES_SMALL (2)
/* If y is valid (> 0) and smaller than x, do x = y */
#define CM_MIN_VALID(x, y) x = (((y > 0) && ((x) > (y))) ? (y) : (x))
/*
* Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
* rtc alarm. It should be 2 or larger
*/
#define CM_RTC_SMALL (2)
static LIST_HEAD(cm_list);
static DEFINE_MUTEX(cm_list_mtx);
/* About in-suspend (suspend-again) monitoring */
static struct alarm *cm_timer;
static bool cm_suspended;
static bool cm_timer_set;
static unsigned long cm_suspend_duration_ms;
/* About normal (not suspended) monitoring */
static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
static unsigned long next_polling; /* Next appointed polling time */
static struct workqueue_struct *cm_wq; /* init at driver add */
static struct delayed_work cm_monitor_work; /* init at driver add */
/**
* is_batt_present - See if the battery presents in place.
* @cm: the Charger Manager representing the battery.
*/
static bool is_batt_present(struct charger_manager *cm)
{
union power_supply_propval val;
struct power_supply *psy;
bool present = false;
int i, ret;
switch (cm->desc->battery_present) {
case CM_BATTERY_PRESENT:
present = true;
break;
case CM_NO_BATTERY:
break;
case CM_FUEL_GAUGE:
psy = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!psy)
break;
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_PRESENT,
&val);
if (ret == 0 && val.intval)
present = true;
power_supply_put(psy);
break;
case CM_CHARGER_STAT:
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
psy = power_supply_get_by_name(
cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
ret = power_supply_get_property(psy,
POWER_SUPPLY_PROP_PRESENT, &val);
power_supply_put(psy);
if (ret == 0 && val.intval) {
present = true;
break;
}
}
break;
}
return present;
}
/**
* is_ext_pwr_online - See if an external power source is attached to charge
* @cm: the Charger Manager representing the battery.
*
* Returns true if at least one of the chargers of the battery has an external
* power source attached to charge the battery regardless of whether it is
* actually charging or not.
*/
static bool is_ext_pwr_online(struct charger_manager *cm)
{
union power_supply_propval val;
struct power_supply *psy;
bool online = false;
int i, ret;
/* If at least one of them has one, it's yes. */
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
&val);
power_supply_put(psy);
if (ret == 0 && val.intval) {
online = true;
break;
}
}
return online;
}
/**
* get_batt_uV - Get the voltage level of the battery
* @cm: the Charger Manager representing the battery.
* @uV: the voltage level returned.
*
* Returns 0 if there is no error.
* Returns a negative value on error.
*/
static int get_batt_uV(struct charger_manager *cm, int *uV)
{
union power_supply_propval val;
struct power_supply *fuel_gauge;
int ret;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return -ENODEV;
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
power_supply_put(fuel_gauge);
if (ret)
return ret;
*uV = val.intval;
return 0;
}
/**
* is_charging - Returns true if the battery is being charged.
* @cm: the Charger Manager representing the battery.
*/
static bool is_charging(struct charger_manager *cm)
{
int i, ret;
bool charging = false;
struct power_supply *psy;
union power_supply_propval val;
/* If there is no battery, it cannot be charged */
if (!is_batt_present(cm))
return false;
/* If at least one of the charger is charging, return yes */
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
/* 1. The charger sholuld not be DISABLED */
if (cm->emergency_stop)
continue;
if (!cm->charger_enabled)
continue;
psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
/* 2. The charger should be online (ext-power) */
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
&val);
if (ret) {
dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
cm->desc->psy_charger_stat[i]);
power_supply_put(psy);
continue;
}
if (val.intval == 0) {
power_supply_put(psy);
continue;
}
/*
* 3. The charger should not be FULL, DISCHARGING,
* or NOT_CHARGING.
*/
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
&val);
power_supply_put(psy);
if (ret) {
dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
cm->desc->psy_charger_stat[i]);
continue;
}
if (val.intval == POWER_SUPPLY_STATUS_FULL ||
val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
continue;
/* Then, this is charging. */
charging = true;
break;
}
return charging;
}
/**
* is_full_charged - Returns true if the battery is fully charged.
* @cm: the Charger Manager representing the battery.
*/
static bool is_full_charged(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
union power_supply_propval val;
struct power_supply *fuel_gauge;
bool is_full = false;
int ret = 0;
int uV;
/* If there is no battery, it cannot be charged */
if (!is_batt_present(cm))
return false;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return false;
/* Full, if it's over the fullbatt voltage */
if (desc->fullbatt_uV > 0) {
ret = get_batt_uV(cm, &uV);
if (!ret) {
/* Battery is already full, checks voltage drop. */
if (cm->battery_status == POWER_SUPPLY_STATUS_FULL
&& desc->fullbatt_vchkdrop_uV)
uV += desc->fullbatt_vchkdrop_uV;
if (uV >= desc->fullbatt_uV)
return true;
}
}
if (desc->fullbatt_full_capacity > 0) {
val.intval = 0;
/* Not full if capacity of fuel gauge isn't full */
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_FULL, &val);
if (!ret && val.intval > desc->fullbatt_full_capacity) {
is_full = true;
goto out;
}
}
/* Full, if the capacity is more than fullbatt_soc */
if (desc->fullbatt_soc > 0) {
val.intval = 0;
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CAPACITY, &val);
if (!ret && val.intval >= desc->fullbatt_soc) {
is_full = true;
goto out;
}
}
out:
power_supply_put(fuel_gauge);
return is_full;
}
/**
* is_polling_required - Return true if need to continue polling for this CM.
* @cm: the Charger Manager representing the battery.
*/
static bool is_polling_required(struct charger_manager *cm)
{
switch (cm->desc->polling_mode) {
case CM_POLL_DISABLE:
return false;
case CM_POLL_ALWAYS:
return true;
case CM_POLL_EXTERNAL_POWER_ONLY:
return is_ext_pwr_online(cm);
case CM_POLL_CHARGING_ONLY:
return is_charging(cm);
default:
dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
cm->desc->polling_mode);
}
return false;
}
/**
* try_charger_enable - Enable/Disable chargers altogether
* @cm: the Charger Manager representing the battery.
* @enable: true: enable / false: disable
*
* Note that Charger Manager keeps the charger enabled regardless whether
* the charger is charging or not (because battery is full or no external
* power source exists) except when CM needs to disable chargers forcibly
* because of emergency causes; when the battery is overheated or too cold.
*/
static int try_charger_enable(struct charger_manager *cm, bool enable)
{
int err = 0, i;
struct charger_desc *desc = cm->desc;
/* Ignore if it's redundant command */
if (enable == cm->charger_enabled)
return 0;
if (enable) {
if (cm->emergency_stop)
return -EAGAIN;
/*
* Save start time of charging to limit
* maximum possible charging time.
*/
cm->charging_start_time = ktime_to_ms(ktime_get());
cm->charging_end_time = 0;
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
if (desc->charger_regulators[i].externally_control)
continue;
err = regulator_enable(desc->charger_regulators[i].consumer);
if (err < 0) {
dev_warn(cm->dev, "Cannot enable %s regulator\n",
desc->charger_regulators[i].regulator_name);
}
}
} else {
/*
* Save end time of charging to maintain fully charged state
* of battery after full-batt.
*/
cm->charging_start_time = 0;
cm->charging_end_time = ktime_to_ms(ktime_get());
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
if (desc->charger_regulators[i].externally_control)
continue;
err = regulator_disable(desc->charger_regulators[i].consumer);
if (err < 0) {
dev_warn(cm->dev, "Cannot disable %s regulator\n",
desc->charger_regulators[i].regulator_name);
}
}
/*
* Abnormal battery state - Stop charging forcibly,
* even if charger was enabled at the other places
*/
for (i = 0; i < desc->num_charger_regulators; i++) {
if (regulator_is_enabled(
desc->charger_regulators[i].consumer)) {
regulator_force_disable(
desc->charger_regulators[i].consumer);
dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
desc->charger_regulators[i].regulator_name);
}
}
}
if (!err)
cm->charger_enabled = enable;
return err;
}
/**
* check_charging_duration - Monitor charging/discharging duration
* @cm: the Charger Manager representing the battery.
*
* If whole charging duration exceed 'charging_max_duration_ms',
* cm stop charging to prevent overcharge/overheat. If discharging
* duration exceed 'discharging _max_duration_ms', charger cable is
* attached, after full-batt, cm start charging to maintain fully
* charged state for battery.
*/
static int check_charging_duration(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
u64 curr = ktime_to_ms(ktime_get());
u64 duration;
int ret = false;
if (!desc->charging_max_duration_ms &&
!desc->discharging_max_duration_ms)
return ret;
if (cm->charger_enabled) {
duration = curr - cm->charging_start_time;
if (duration > desc->charging_max_duration_ms) {
dev_info(cm->dev, "Charging duration exceed %ums\n",
desc->charging_max_duration_ms);
ret = true;
}
} else if (cm->battery_status == POWER_SUPPLY_STATUS_NOT_CHARGING) {
duration = curr - cm->charging_end_time;
if (duration > desc->discharging_max_duration_ms) {
dev_info(cm->dev, "Discharging duration exceed %ums\n",
desc->discharging_max_duration_ms);
ret = true;
}
}
return ret;
}
static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
int *temp)
{
struct power_supply *fuel_gauge;
int ret;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return -ENODEV;
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_TEMP,
(union power_supply_propval *)temp);
power_supply_put(fuel_gauge);
return ret;
}
static int cm_get_battery_temperature(struct charger_manager *cm,
int *temp)
{
int ret;
if (!cm->desc->measure_battery_temp)
return -ENODEV;
#ifdef CONFIG_THERMAL
if (cm->tzd_batt) {
ret = thermal_zone_get_temp(cm->tzd_batt, temp);
if (!ret)
/* Calibrate temperature unit */
*temp /= 100;
} else
#endif
{
/* if-else continued from CONFIG_THERMAL */
ret = cm_get_battery_temperature_by_psy(cm, temp);
}
return ret;
}
static int cm_check_thermal_status(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
int temp, upper_limit, lower_limit;
int ret = 0;
ret = cm_get_battery_temperature(cm, &temp);
if (ret) {
/* FIXME:
* No information of battery temperature might
* occur hazardous result. We have to handle it
* depending on battery type.
*/
dev_err(cm->dev, "Failed to get battery temperature\n");
return 0;
}
upper_limit = desc->temp_max;
lower_limit = desc->temp_min;
if (cm->emergency_stop) {
upper_limit -= desc->temp_diff;
lower_limit += desc->temp_diff;
}
if (temp > upper_limit)
ret = CM_BATT_OVERHEAT;
else if (temp < lower_limit)
ret = CM_BATT_COLD;
else
ret = CM_BATT_OK;
cm->emergency_stop = ret;
return ret;
}
/**
* cm_get_target_status - Check current status and get next target status.
* @cm: the Charger Manager representing the battery.
*/
static int cm_get_target_status(struct charger_manager *cm)
{
if (!is_ext_pwr_online(cm))
return POWER_SUPPLY_STATUS_DISCHARGING;
if (cm_check_thermal_status(cm)) {
/* Check if discharging duration exceeds limit. */
if (check_charging_duration(cm))
goto charging_ok;
return POWER_SUPPLY_STATUS_NOT_CHARGING;
}
switch (cm->battery_status) {
case POWER_SUPPLY_STATUS_CHARGING:
/* Check if charging duration exceeds limit. */
if (check_charging_duration(cm))
return POWER_SUPPLY_STATUS_FULL;
fallthrough;
case POWER_SUPPLY_STATUS_FULL:
if (is_full_charged(cm))
return POWER_SUPPLY_STATUS_FULL;
fallthrough;
default:
break;
}
charging_ok:
/* Charging is allowed. */
return POWER_SUPPLY_STATUS_CHARGING;
}
/**
* _cm_monitor - Monitor the temperature and return true for exceptions.
* @cm: the Charger Manager representing the battery.
*
* Returns true if there is an event to notify for the battery.
* (True if the status of "emergency_stop" changes)
*/
static bool _cm_monitor(struct charger_manager *cm)
{
int target;
target = cm_get_target_status(cm);
try_charger_enable(cm, (target == POWER_SUPPLY_STATUS_CHARGING));
if (cm->battery_status != target) {
cm->battery_status = target;
power_supply_changed(cm->charger_psy);
}
return (cm->battery_status == POWER_SUPPLY_STATUS_NOT_CHARGING);
}
/**
* cm_monitor - Monitor every battery.
*
* Returns true if there is an event to notify from any of the batteries.
* (True if the status of "emergency_stop" changes)
*/
static bool cm_monitor(void)
{
bool stop = false;
struct charger_manager *cm;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (_cm_monitor(cm))
stop = true;
}
mutex_unlock(&cm_list_mtx);
return stop;
}
/**
* _setup_polling - Setup the next instance of polling.
* @work: work_struct of the function _setup_polling.
*/
static void _setup_polling(struct work_struct *work)
{
unsigned long min = ULONG_MAX;
struct charger_manager *cm;
bool keep_polling = false;
unsigned long _next_polling;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
keep_polling = true;
if (min > cm->desc->polling_interval_ms)
min = cm->desc->polling_interval_ms;
}
}
polling_jiffy = msecs_to_jiffies(min);
if (polling_jiffy <= CM_JIFFIES_SMALL)
polling_jiffy = CM_JIFFIES_SMALL + 1;
if (!keep_polling)
polling_jiffy = ULONG_MAX;
if (polling_jiffy == ULONG_MAX)
goto out;
WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
". try it later. %s\n", __func__);
/*
* Use mod_delayed_work() iff the next polling interval should
* occur before the currently scheduled one. If @cm_monitor_work
* isn't active, the end result is the same, so no need to worry
* about stale @next_polling.
*/
_next_polling = jiffies + polling_jiffy;
if (time_before(_next_polling, next_polling)) {
mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
next_polling = _next_polling;
} else {
if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
next_polling = _next_polling;
}
out:
mutex_unlock(&cm_list_mtx);
}
static DECLARE_WORK(setup_polling, _setup_polling);
/**
* cm_monitor_poller - The Monitor / Poller.
* @work: work_struct of the function cm_monitor_poller
*
* During non-suspended state, cm_monitor_poller is used to poll and monitor
* the batteries.
*/
static void cm_monitor_poller(struct work_struct *work)
{
cm_monitor();
schedule_work(&setup_polling);
}
static int charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct charger_manager *cm = power_supply_get_drvdata(psy);
struct charger_desc *desc = cm->desc;
struct power_supply *fuel_gauge = NULL;
int ret = 0;
int uV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = cm->battery_status;
break;
case POWER_SUPPLY_PROP_HEALTH:
if (cm->emergency_stop == CM_BATT_OVERHEAT)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (cm->emergency_stop == CM_BATT_COLD)
val->intval = POWER_SUPPLY_HEALTH_COLD;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_PRESENT:
if (is_batt_present(cm))
val->intval = 1;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = get_batt_uV(cm, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CURRENT_NOW, val);
break;
case POWER_SUPPLY_PROP_TEMP:
return cm_get_battery_temperature(cm, &val->intval);
case POWER_SUPPLY_PROP_CAPACITY:
if (!is_batt_present(cm)) {
/* There is no battery. Assume 100% */
val->intval = 100;
break;
}
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CAPACITY, val);
if (ret)
break;
if (val->intval > 100) {
val->intval = 100;
break;
}
if (val->intval < 0)
val->intval = 0;
/* Do not adjust SOC when charging: voltage is overrated */
if (is_charging(cm))
break;
/*
* If the capacity value is inconsistent, calibrate it base on
* the battery voltage values and the thresholds given as desc
*/
ret = get_batt_uV(cm, &uV);
if (ret) {
/* Voltage information not available. No calibration */
ret = 0;
break;
}
if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
!is_charging(cm)) {
val->intval = 100;
break;
}
break;
case POWER_SUPPLY_PROP_ONLINE:
if (is_ext_pwr_online(cm))
val->intval = 1;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_CHARGE_NOW:
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = power_supply_get_property(fuel_gauge, psp, val);
break;
default:
return -EINVAL;
}
if (fuel_gauge)
power_supply_put(fuel_gauge);
return ret;
}
#define NUM_CHARGER_PSY_OPTIONAL (4)
static enum power_supply_property default_charger_props[] = {
/* Guaranteed to provide */
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_ONLINE,
/*
* Optional properties are:
* POWER_SUPPLY_PROP_CHARGE_FULL,
* POWER_SUPPLY_PROP_CHARGE_NOW,
* POWER_SUPPLY_PROP_CURRENT_NOW,
* POWER_SUPPLY_PROP_TEMP,
*/
};
static const struct power_supply_desc psy_default = {
.name = "battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = default_charger_props,
.num_properties = ARRAY_SIZE(default_charger_props),
.get_property = charger_get_property,
.no_thermal = true,
};
/**
* cm_setup_timer - For in-suspend monitoring setup wakeup alarm
* for suspend_again.
*
* Returns true if the alarm is set for Charger Manager to use.
* Returns false if
* cm_setup_timer fails to set an alarm,
* cm_setup_timer does not need to set an alarm for Charger Manager,
* or an alarm previously configured is to be used.
*/
static bool cm_setup_timer(void)
{
struct charger_manager *cm;
unsigned int wakeup_ms = UINT_MAX;
int timer_req = 0;
if (time_after(next_polling, jiffies))
CM_MIN_VALID(wakeup_ms,
jiffies_to_msecs(next_polling - jiffies));
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
/* Skip if polling is not required for this CM */
if (!is_polling_required(cm) && !cm->emergency_stop)
continue;
timer_req++;
if (cm->desc->polling_interval_ms == 0)
continue;
CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
}
mutex_unlock(&cm_list_mtx);
if (timer_req && cm_timer) {
ktime_t now, add;
/*
* Set alarm with the polling interval (wakeup_ms)
* The alarm time should be NOW + CM_RTC_SMALL or later.
*/
if (wakeup_ms == UINT_MAX ||
wakeup_ms < CM_RTC_SMALL * MSEC_PER_SEC)
wakeup_ms = 2 * CM_RTC_SMALL * MSEC_PER_SEC;
pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
now = ktime_get_boottime();
add = ktime_set(wakeup_ms / MSEC_PER_SEC,
(wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
alarm_start(cm_timer, ktime_add(now, add));
cm_suspend_duration_ms = wakeup_ms;
return true;
}
return false;
}
/**
* charger_extcon_work - enable/diable charger according to the state
* of charger cable
*
* @work: work_struct of the function charger_extcon_work.
*/
static void charger_extcon_work(struct work_struct *work)
{
struct charger_cable *cable =
container_of(work, struct charger_cable, wq);
int ret;
if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
ret = regulator_set_current_limit(cable->charger->consumer,
cable->min_uA, cable->max_uA);
if (ret < 0) {
pr_err("Cannot set current limit of %s (%s)\n",
cable->charger->regulator_name, cable->name);
return;
}
pr_info("Set current limit of %s : %duA ~ %duA\n",
cable->charger->regulator_name,
cable->min_uA, cable->max_uA);
}
cancel_delayed_work(&cm_monitor_work);
queue_delayed_work(cm_wq, &cm_monitor_work, 0);
}
/**
* charger_extcon_notifier - receive the state of charger cable
* when registered cable is attached or detached.
*
* @self: the notifier block of the charger_extcon_notifier.
* @event: the cable state.
* @ptr: the data pointer of notifier block.
*/
static int charger_extcon_notifier(struct notifier_block *self,
unsigned long event, void *ptr)
{
struct charger_cable *cable =
container_of(self, struct charger_cable, nb);
/*
* The newly state of charger cable.
* If cable is attached, cable->attached is true.
*/
cable->attached = event;
/*
* Setup work for controlling charger(regulator)
* according to charger cable.
*/
schedule_work(&cable->wq);
return NOTIFY_DONE;
}
/**
* charger_extcon_init - register external connector to use it
* as the charger cable
*
* @cm: the Charger Manager representing the battery.
* @cable: the Charger cable representing the external connector.
*/
static int charger_extcon_init(struct charger_manager *cm,
struct charger_cable *cable)
{
int ret, i;
u64 extcon_type = EXTCON_NONE;
/*
* Charger manager use Extcon framework to identify
* the charger cable among various external connector
* cable (e.g., TA, USB, MHL, Dock).
*/
INIT_WORK(&cable->wq, charger_extcon_work);
cable->nb.notifier_call = charger_extcon_notifier;
cable->extcon_dev = extcon_get_extcon_dev(cable->extcon_name);
if (IS_ERR(cable->extcon_dev)) {
pr_err("Cannot find extcon_dev for %s (cable: %s)\n",
cable->extcon_name, cable->name);
return PTR_ERR(cable->extcon_dev);
}
for (i = 0; i < ARRAY_SIZE(extcon_mapping); i++) {
if (!strcmp(cable->name, extcon_mapping[i].name)) {
extcon_type = extcon_mapping[i].extcon_type;
break;
}
}
if (extcon_type == EXTCON_NONE) {
pr_err("Cannot find cable for type %s", cable->name);
return -EINVAL;
}
cable->extcon_type = extcon_type;
ret = devm_extcon_register_notifier(cm->dev, cable->extcon_dev,
cable->extcon_type, &cable->nb);
if (ret < 0) {
pr_err("Cannot register extcon_dev for %s (cable: %s)\n",
cable->extcon_name, cable->name);
return ret;
}
return 0;
}
/**
* charger_manager_register_extcon - Register extcon device to receive state
* of charger cable.
* @cm: the Charger Manager representing the battery.
*
* This function support EXTCON(External Connector) subsystem to detect the
* state of charger cables for enabling or disabling charger(regulator) and
* select the charger cable for charging among a number of external cable
* according to policy of H/W board.
*/
static int charger_manager_register_extcon(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
struct charger_regulator *charger;
unsigned long event;
int ret;
int i;
int j;
for (i = 0; i < desc->num_charger_regulators; i++) {
charger = &desc->charger_regulators[i];
charger->consumer = regulator_get(cm->dev,
charger->regulator_name);
if (IS_ERR(charger->consumer)) {
dev_err(cm->dev, "Cannot find charger(%s)\n",
charger->regulator_name);
return PTR_ERR(charger->consumer);
}
charger->cm = cm;
for (j = 0; j < charger->num_cables; j++) {
struct charger_cable *cable = &charger->cables[j];
ret = charger_extcon_init(cm, cable);
if (ret < 0) {
dev_err(cm->dev, "Cannot initialize charger(%s)\n",
charger->regulator_name);
return ret;
}
cable->charger = charger;
cable->cm = cm;
event = extcon_get_state(cable->extcon_dev,
cable->extcon_type);
charger_extcon_notifier(&cable->nb,
event, NULL);
}
}
return 0;
}
/* help function of sysfs node to control charger(regulator) */
static ssize_t charger_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator, attr_name);
return sysfs_emit(buf, "%s\n", charger->regulator_name);
}
static ssize_t charger_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator, attr_state);
int state = 0;
if (!charger->externally_control)
state = regulator_is_enabled(charger->consumer);
return sysfs_emit(buf, "%s\n", state ? "enabled" : "disabled");
}
static ssize_t charger_externally_control_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger = container_of(attr,
struct charger_regulator, attr_externally_control);
return sysfs_emit(buf, "%d\n", charger->externally_control);
}
static ssize_t charger_externally_control_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator,
attr_externally_control);
struct charger_manager *cm = charger->cm;
struct charger_desc *desc = cm->desc;
int i;
int ret;
int externally_control;
int chargers_externally_control = 1;
ret = sscanf(buf, "%d", &externally_control);
if (ret == 0) {
ret = -EINVAL;
return ret;
}
if (!externally_control) {
charger->externally_control = 0;
return count;
}
for (i = 0; i < desc->num_charger_regulators; i++) {
if (&desc->charger_regulators[i] != charger &&
!desc->charger_regulators[i].externally_control) {
/*
* At least, one charger is controlled by
* charger-manager
*/
chargers_externally_control = 0;
break;
}
}
if (!chargers_externally_control) {
if (cm->charger_enabled) {
try_charger_enable(charger->cm, false);
charger->externally_control = externally_control;
try_charger_enable(charger->cm, true);
} else {
charger->externally_control = externally_control;
}
} else {
dev_warn(cm->dev,
"'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
charger->regulator_name);
}
return count;
}
/**
* charger_manager_prepare_sysfs - Prepare sysfs entry for each charger
* @cm: the Charger Manager representing the battery.
*
* This function add sysfs entry for charger(regulator) to control charger from
* user-space. If some development board use one more chargers for charging
* but only need one charger on specific case which is dependent on user
* scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
* class/power_supply/battery/charger.[index]/externally_control'. For example,
* if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
* externally_control, this charger isn't controlled from charger-manager and
* always stay off state of regulator.
*/
static int charger_manager_prepare_sysfs(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
struct charger_regulator *charger;
int chargers_externally_control = 1;
char *name;
int i;
/* Create sysfs entry to control charger(regulator) */
for (i = 0; i < desc->num_charger_regulators; i++) {
charger = &desc->charger_regulators[i];
name = devm_kasprintf(cm->dev, GFP_KERNEL, "charger.%d", i);
if (!name)
return -ENOMEM;
charger->attrs[0] = &charger->attr_name.attr;
charger->attrs[1] = &charger->attr_state.attr;
charger->attrs[2] = &charger->attr_externally_control.attr;
charger->attrs[3] = NULL;
charger->attr_grp.name = name;
charger->attr_grp.attrs = charger->attrs;
desc->sysfs_groups[i] = &charger->attr_grp;
sysfs_attr_init(&charger->attr_name.attr);
charger->attr_name.attr.name = "name";
charger->attr_name.attr.mode = 0444;
charger->attr_name.show = charger_name_show;
sysfs_attr_init(&charger->attr_state.attr);
charger->attr_state.attr.name = "state";
charger->attr_state.attr.mode = 0444;
charger->attr_state.show = charger_state_show;
sysfs_attr_init(&charger->attr_externally_control.attr);
charger->attr_externally_control.attr.name
= "externally_control";
charger->attr_externally_control.attr.mode = 0644;
charger->attr_externally_control.show
= charger_externally_control_show;
charger->attr_externally_control.store
= charger_externally_control_store;
if (!desc->charger_regulators[i].externally_control ||
!chargers_externally_control)
chargers_externally_control = 0;
dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
charger->regulator_name, charger->externally_control);
}
if (chargers_externally_control) {
dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
return -EINVAL;
}
return 0;
}
static int cm_init_thermal_data(struct charger_manager *cm,
struct power_supply *fuel_gauge,
enum power_supply_property *properties,
size_t *num_properties)
{
struct charger_desc *desc = cm->desc;
union power_supply_propval val;
int ret;
/* Verify whether fuel gauge provides battery temperature */
ret = power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_TEMP, &val);
if (!ret) {
properties[*num_properties] = POWER_SUPPLY_PROP_TEMP;
(*num_properties)++;
cm->desc->measure_battery_temp = true;
}
#ifdef CONFIG_THERMAL
if (ret && desc->thermal_zone) {
cm->tzd_batt =
thermal_zone_get_zone_by_name(desc->thermal_zone);
if (IS_ERR(cm->tzd_batt))
return PTR_ERR(cm->tzd_batt);
/* Use external thermometer */
properties[*num_properties] = POWER_SUPPLY_PROP_TEMP;
(*num_properties)++;
cm->desc->measure_battery_temp = true;
ret = 0;
}
#endif
if (cm->desc->measure_battery_temp) {
/* NOTICE : Default allowable minimum charge temperature is 0 */
if (!desc->temp_max)
desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
if (!desc->temp_diff)
desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
}
return ret;
}
static const struct of_device_id charger_manager_match[] = {
{
.compatible = "charger-manager",
},
{},
};
MODULE_DEVICE_TABLE(of, charger_manager_match);
static struct charger_desc *of_cm_parse_desc(struct device *dev)
{
struct charger_desc *desc;
struct device_node *np = dev->of_node;
u32 poll_mode = CM_POLL_DISABLE;
u32 battery_stat = CM_NO_BATTERY;
int num_chgs = 0;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return ERR_PTR(-ENOMEM);
of_property_read_string(np, "cm-name", &desc->psy_name);
of_property_read_u32(np, "cm-poll-mode", &poll_mode);
desc->polling_mode = poll_mode;
of_property_read_u32(np, "cm-poll-interval",
&desc->polling_interval_ms);
of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
&desc->fullbatt_vchkdrop_uV);
of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
of_property_read_u32(np, "cm-fullbatt-capacity",
&desc->fullbatt_full_capacity);
of_property_read_u32(np, "cm-battery-stat", &battery_stat);
desc->battery_present = battery_stat;
/* chargers */
num_chgs = of_property_count_strings(np, "cm-chargers");
if (num_chgs > 0) {
int i;
/* Allocate empty bin at the tail of array */
desc->psy_charger_stat = devm_kcalloc(dev,
num_chgs + 1,
sizeof(char *),
GFP_KERNEL);
if (!desc->psy_charger_stat)
return ERR_PTR(-ENOMEM);
for (i = 0; i < num_chgs; i++)
of_property_read_string_index(np, "cm-chargers",
i, &desc->psy_charger_stat[i]);
}
of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
if (of_property_read_bool(np, "cm-battery-cold-in-minus"))
desc->temp_min *= -1;
of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
of_property_read_u32(np, "cm-charging-max",
&desc->charging_max_duration_ms);
of_property_read_u32(np, "cm-discharging-max",
&desc->discharging_max_duration_ms);
/* battery charger regulators */
desc->num_charger_regulators = of_get_child_count(np);
if (desc->num_charger_regulators) {
struct charger_regulator *chg_regs;
struct device_node *child;
chg_regs = devm_kcalloc(dev,
desc->num_charger_regulators,
sizeof(*chg_regs),
GFP_KERNEL);
if (!chg_regs)
return ERR_PTR(-ENOMEM);
desc->charger_regulators = chg_regs;
desc->sysfs_groups = devm_kcalloc(dev,
desc->num_charger_regulators + 1,
sizeof(*desc->sysfs_groups),
GFP_KERNEL);
if (!desc->sysfs_groups)
return ERR_PTR(-ENOMEM);
for_each_child_of_node(np, child) {
struct charger_cable *cables;
struct device_node *_child;
of_property_read_string(child, "cm-regulator-name",
&chg_regs->regulator_name);
/* charger cables */
chg_regs->num_cables = of_get_child_count(child);
if (chg_regs->num_cables) {
cables = devm_kcalloc(dev,
chg_regs->num_cables,
sizeof(*cables),
GFP_KERNEL);
if (!cables) {
of_node_put(child);
return ERR_PTR(-ENOMEM);
}
chg_regs->cables = cables;
for_each_child_of_node(child, _child) {
of_property_read_string(_child,
"cm-cable-name", &cables->name);
of_property_read_string(_child,
"cm-cable-extcon",
&cables->extcon_name);
of_property_read_u32(_child,
"cm-cable-min",
&cables->min_uA);
of_property_read_u32(_child,
"cm-cable-max",
&cables->max_uA);
cables++;
}
}
chg_regs++;
}
}
return desc;
}
static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
{
if (pdev->dev.of_node)
return of_cm_parse_desc(&pdev->dev);
return dev_get_platdata(&pdev->dev);
}
static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
{
cm_timer_set = false;
return ALARMTIMER_NORESTART;
}
static int charger_manager_probe(struct platform_device *pdev)
{
struct charger_desc *desc = cm_get_drv_data(pdev);
struct charger_manager *cm;
int ret, i = 0;
union power_supply_propval val;
struct power_supply *fuel_gauge;
enum power_supply_property *properties;
size_t num_properties;
struct power_supply_config psy_cfg = {};
if (IS_ERR(desc)) {
dev_err(&pdev->dev, "No platform data (desc) found\n");
return PTR_ERR(desc);
}
cm = devm_kzalloc(&pdev->dev, sizeof(*cm), GFP_KERNEL);
if (!cm)
return -ENOMEM;
/* Basic Values. Unspecified are Null or 0 */
cm->dev = &pdev->dev;
cm->desc = desc;
psy_cfg.drv_data = cm;
/* Initialize alarm timer */
if (alarmtimer_get_rtcdev()) {
cm_timer = devm_kzalloc(cm->dev, sizeof(*cm_timer), GFP_KERNEL);
if (!cm_timer)
return -ENOMEM;
alarm_init(cm_timer, ALARM_BOOTTIME, cm_timer_func);
}
/*
* Some of the following do not need to be errors.
* Users may intentionally ignore those features.
*/
if (desc->fullbatt_uV == 0) {
dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
}
if (!desc->fullbatt_vchkdrop_uV) {
dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
desc->fullbatt_vchkdrop_uV = 0;
}
if (desc->fullbatt_soc == 0) {
dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
}
if (desc->fullbatt_full_capacity == 0) {
dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
}
if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
dev_err(&pdev->dev, "charger_regulators undefined\n");
return -EINVAL;
}
if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
dev_err(&pdev->dev, "No power supply defined\n");
return -EINVAL;
}
if (!desc->psy_fuel_gauge) {
dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
return -EINVAL;
}
/* Check if charger's supplies are present at probe */
for (i = 0; desc->psy_charger_stat[i]; i++) {
struct power_supply *psy;
psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
if (!psy) {
dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
desc->psy_charger_stat[i]);
return -ENODEV;
}
power_supply_put(psy);
}
if (cm->desc->polling_mode != CM_POLL_DISABLE &&
(desc->polling_interval_ms == 0 ||
msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL)) {
dev_err(&pdev->dev, "polling_interval_ms is too small\n");
return -EINVAL;
}
if (!desc->charging_max_duration_ms ||
!desc->discharging_max_duration_ms) {
dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
desc->charging_max_duration_ms = 0;
desc->discharging_max_duration_ms = 0;
}
platform_set_drvdata(pdev, cm);
memcpy(&cm->charger_psy_desc, &psy_default, sizeof(psy_default));
if (!desc->psy_name)
strscpy(cm->psy_name_buf, psy_default.name,
sizeof(cm->psy_name_buf));
else
strscpy(cm->psy_name_buf, desc->psy_name,
sizeof(cm->psy_name_buf));
cm->charger_psy_desc.name = cm->psy_name_buf;
/* Allocate for psy properties because they may vary */
properties = devm_kcalloc(&pdev->dev,
ARRAY_SIZE(default_charger_props) +
NUM_CHARGER_PSY_OPTIONAL,
sizeof(*properties), GFP_KERNEL);
if (!properties)
return -ENOMEM;
memcpy(properties, default_charger_props,
sizeof(enum power_supply_property) *
ARRAY_SIZE(default_charger_props));
num_properties = ARRAY_SIZE(default_charger_props);
/* Find which optional psy-properties are available */
fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
if (!fuel_gauge) {
dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
desc->psy_fuel_gauge);
return -ENODEV;
}
if (!power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_FULL, &val)) {
properties[num_properties] =
POWER_SUPPLY_PROP_CHARGE_FULL;
num_properties++;
}
if (!power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
properties[num_properties] =
POWER_SUPPLY_PROP_CHARGE_NOW;
num_properties++;
}
if (!power_supply_get_property(fuel_gauge,
POWER_SUPPLY_PROP_CURRENT_NOW,
&val)) {
properties[num_properties] =
POWER_SUPPLY_PROP_CURRENT_NOW;
num_properties++;
}
ret = cm_init_thermal_data(cm, fuel_gauge, properties, &num_properties);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize thermal data\n");
cm->desc->measure_battery_temp = false;
}
power_supply_put(fuel_gauge);
cm->charger_psy_desc.properties = properties;
cm->charger_psy_desc.num_properties = num_properties;
/* Register sysfs entry for charger(regulator) */
ret = charger_manager_prepare_sysfs(cm);
if (ret < 0) {
dev_err(&pdev->dev,
"Cannot prepare sysfs entry of regulators\n");
return ret;
}
psy_cfg.attr_grp = desc->sysfs_groups;
cm->charger_psy = power_supply_register(&pdev->dev,
&cm->charger_psy_desc,
&psy_cfg);
if (IS_ERR(cm->charger_psy)) {
dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
cm->charger_psy_desc.name);
return PTR_ERR(cm->charger_psy);
}
/* Register extcon device for charger cable */
ret = charger_manager_register_extcon(cm);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot initialize extcon device\n");
goto err_reg_extcon;
}
/* Add to the list */
mutex_lock(&cm_list_mtx);
list_add(&cm->entry, &cm_list);
mutex_unlock(&cm_list_mtx);
/*
* Charger-manager is capable of waking up the system from sleep
* when event is happened through cm_notify_event()
*/
device_init_wakeup(&pdev->dev, true);
device_set_wakeup_capable(&pdev->dev, false);
/*
* Charger-manager have to check the charging state right after
* initialization of charger-manager and then update current charging
* state.
*/
cm_monitor();
schedule_work(&setup_polling);
return 0;
err_reg_extcon:
for (i = 0; i < desc->num_charger_regulators; i++)
regulator_put(desc->charger_regulators[i].consumer);
power_supply_unregister(cm->charger_psy);
return ret;
}
static void charger_manager_remove(struct platform_device *pdev)
{
struct charger_manager *cm = platform_get_drvdata(pdev);
struct charger_desc *desc = cm->desc;
int i = 0;
/* Remove from the list */
mutex_lock(&cm_list_mtx);
list_del(&cm->entry);
mutex_unlock(&cm_list_mtx);
cancel_work_sync(&setup_polling);
cancel_delayed_work_sync(&cm_monitor_work);
for (i = 0 ; i < desc->num_charger_regulators ; i++)
regulator_put(desc->charger_regulators[i].consumer);
power_supply_unregister(cm->charger_psy);
try_charger_enable(cm, false);
}
static const struct platform_device_id charger_manager_id[] = {
{ "charger-manager", 0 },
{ },
};
MODULE_DEVICE_TABLE(platform, charger_manager_id);
static int cm_suspend_noirq(struct device *dev)
{
if (device_may_wakeup(dev)) {
device_set_wakeup_capable(dev, false);
return -EAGAIN;
}
return 0;
}
static bool cm_need_to_awake(void)
{
struct charger_manager *cm;
if (cm_timer)
return false;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (is_charging(cm)) {
mutex_unlock(&cm_list_mtx);
return true;
}
}
mutex_unlock(&cm_list_mtx);
return false;
}
static int cm_suspend_prepare(struct device *dev)
{
if (cm_need_to_awake())
return -EBUSY;
if (!cm_suspended)
cm_suspended = true;
cm_timer_set = cm_setup_timer();
if (cm_timer_set) {
cancel_work_sync(&setup_polling);
cancel_delayed_work_sync(&cm_monitor_work);
}
return 0;
}
static void cm_suspend_complete(struct device *dev)
{
struct charger_manager *cm = dev_get_drvdata(dev);
if (cm_suspended)
cm_suspended = false;
if (cm_timer_set) {
ktime_t remain;
alarm_cancel(cm_timer);
cm_timer_set = false;
remain = alarm_expires_remaining(cm_timer);
cm_suspend_duration_ms -= ktime_to_ms(remain);
schedule_work(&setup_polling);
}
_cm_monitor(cm);
device_set_wakeup_capable(cm->dev, false);
}
static const struct dev_pm_ops charger_manager_pm = {
.prepare = cm_suspend_prepare,
.suspend_noirq = cm_suspend_noirq,
.complete = cm_suspend_complete,
};
static struct platform_driver charger_manager_driver = {
.driver = {
.name = "charger-manager",
.pm = &charger_manager_pm,
.of_match_table = charger_manager_match,
},
.probe = charger_manager_probe,
.remove_new = charger_manager_remove,
.id_table = charger_manager_id,
};
static int __init charger_manager_init(void)
{
cm_wq = create_freezable_workqueue("charger_manager");
if (unlikely(!cm_wq))
return -ENOMEM;
INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
return platform_driver_register(&charger_manager_driver);
}
late_initcall(charger_manager_init);
static void __exit charger_manager_cleanup(void)
{
destroy_workqueue(cm_wq);
cm_wq = NULL;
platform_driver_unregister(&charger_manager_driver);
}
module_exit(charger_manager_cleanup);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("Charger Manager");
MODULE_LICENSE("GPL");