Quelle  charger-manager.c   Sprache: C

// 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/string_choices.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 should 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", str_enabled_disabled(state));
}

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 void cm_timer_func(struct alarm *alarm, ktime_t now)
{
 cm_timer_set = false;
}

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 = 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 ");
MODULE_DESCRIPTION("Charger Manager");
MODULE_LICENSE("GPL");