Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1770 insertions, 0 deletions

diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c
new file mode 100644
index 0000000000..5fa6ba7f41
--- /dev/null
+++ b/drivers/power/supply/charger-manager.c
@@ -0,0 +1,1770 @@
+// 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)
+		strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
+	else
+		strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
+	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 int 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);
+
+	return 0;
+}
+
+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 = 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");