/*
   *  max77823_charger.c
   *  Samsung MAX77823 Charger Driver
   *
   *  Copyright (C) 2012 Samsung Electronics
   *
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/mfd/max77823.h>
  #include <linux/mfd/max77823-private.h>
  #include <linux/debugfs.h>
  #include <linux/regulator/consumer.h>
  #include <linux/seq_file.h>
  //#include <linux/usb_notify.h>
  #include <linux/battery/charger/max77823_charger.h>
  #ifdef CONFIG_EXTCON_MAX77828
  #include <linux/mfd/max77828-private.h>
  #endif
  
  #define ENABLE 1
  #define DISABLE 0
  
  #define SIOP_INPUT_LIMIT_CURRENT                1200
  #define SIOP_CHARGING_LIMIT_CURRENT             1000
  #define SIOP_WIRELESS_INPUT_LIMIT_CURRENT		660
  #define SIOP_WIRELESS_CHARGING_LIMIT_CURRENT	780
  #define SLOW_CHARGING_CURRENT_STANDARD          400
  #define INPUT_CURRENT_1000mA                    0x1E
  
  static enum power_supply_property max77823_charger_props[] = {
  	POWER_SUPPLY_PROP_STATUS,
  	POWER_SUPPLY_PROP_PRESENT,
  	POWER_SUPPLY_PROP_CHARGING_ENABLED,
  	POWER_SUPPLY_PROP_CHARGE_TYPE,
  	POWER_SUPPLY_PROP_HEALTH,
  	POWER_SUPPLY_PROP_ONLINE,
  	POWER_SUPPLY_PROP_CURRENT_MAX,
  	POWER_SUPPLY_PROP_CURRENT_AVG,
  	POWER_SUPPLY_PROP_CURRENT_NOW,
  	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
  };
  static enum power_supply_property max77823_otg_props[] = {
  	POWER_SUPPLY_PROP_ONLINE,
  };
  
  static const char* const psy_names[] = {
  [PS_BATT] = "battery",
  [PS_PS] = "ps",
  [PS_WIRELESS] = "wireless",
  };
  
  static int psy_get_prop(struct max77823_charger_data *charger, enum ps_id id, enum power_supply_property property, union power_supply_propval *value)
  {
  	struct power_supply *psy = charger->psy_ref[id];
  	int ret = -EINVAL;
  
  	value->intval = 0;
  	if (!psy) {
  		unsigned long timeout = jiffies + msecs_to_jiffies(500);
  		do {
  			psy = power_supply_get_by_name(psy_names[id]);
  			if (psy) {
  				charger->psy_ref[id] = psy;
  				break;
  			}
  			if (time_after(jiffies, timeout)) {
  				pr_err("%s: charger Failed %s
  ",  __func__, psy_names[id]);
  				return -ENODEV;
  			}
  			msleep(1);
  		} while (1);
  	}
  	if (psy->get_property) {
  		ret = psy->get_property(psy, property, value);
  		if (ret < 0)
  			pr_err("%s: charger Fail to get %s(%d=>%d)
  ", __func__, psy_names[id], property, ret);
  	}
  	return ret;
  }
  
  static int psy_set_prop(struct max77823_charger_data *charger, enum ps_id id, enum power_supply_property property, union power_supply_propval *value)
  {
  	struct power_supply *psy = charger->psy_ref[id];
  	int ret = -EINVAL;
  
  	if (!psy) {
  		unsigned long timeout = jiffies + msecs_to_jiffies(500);
  		do {
  			psy = power_supply_get_by_name(psy_names[id]);
  			if (psy) {
  				charger->psy_ref[id] = psy;
  				break;
  			}
  			if (time_after(jiffies, timeout)) {
  				pr_err("%s: charger Failed %s
  ",  __func__, psy_names[id]);
  				return -ENODEV;
  			}
  			msleep(1);
  		} while (1);
  	}
  	if (psy->set_property) {
  		ret = psy->set_property(psy, property, value);
  		if (ret < 0)
  			pr_err("%s: charger Fail to set %s(%d=>%d)
  ", __func__, psy_names[id], property, ret);
  	}
  	return ret;
  }
  
  static struct sec_charging_current *get_charging_info(struct max77823_charger_data *charger, int index)
  {
  	struct sec_battery_platform_data *pdata = charger->pdata;
  	if (index >= pdata->charging_current_entries) {
  		pr_err("%s: invalid index %d
  ", __func__, index);
  		index = POWER_SUPPLY_TYPE_UNKNOWN;	/* 0 */
  	}
  	return &pdata->charging_current[index];
  }
  
  static void max77823_charger_initialize(struct max77823_charger_data *charger);
  static int max77823_get_vbus_state(struct max77823_charger_data *charger);
  static int max77823_get_charger_state(struct max77823_charger_data *charger);
  static bool max77823_charger_unlock(struct max77823_charger_data *charger)
  {
  	struct i2c_client *i2c = charger->i2c;
  	u8 reg_data;
  	u8 chgprot;
  	int retry_cnt = 0;
  	bool need_init = false;
  
  	do {
  		max77823_read_reg(i2c, MAX77823_CHG_CNFG_06, &reg_data);
  		chgprot = ((reg_data & 0x0C) >> 2);
  		if (chgprot != 0x03) {
  			pr_err("%s: unlock err, chgprot(0x%x), retry(%d)
  ",
  					__func__, chgprot, retry_cnt);
  			max77823_write_reg(i2c, MAX77823_CHG_CNFG_06,
  					   (0x03 << 2));
  			need_init = true;
  			msleep(20);
  		} else {
  			pr_debug("%s: unlock success, chgprot(0x%x)
  ",
  				__func__, chgprot);
  			break;
  		}
  	} while ((chgprot != 0x03) && (++retry_cnt < 10));
  
  	return need_init;
  }
  
  static void check_charger_unlock_state(struct max77823_charger_data *charger)
  {
  	bool need_reg_init;
  	pr_debug("%s
  ", __func__);
  
  	need_reg_init = max77823_charger_unlock(charger);
  	if (need_reg_init) {
  		pr_err("%s: charger locked state, reg init
  ", __func__);
  		max77823_charger_initialize(charger);
  	}
  }
  
  static void max77823_test_read(struct max77823_charger_data *charger)
  {
  	u8 data = 0;
  	u32 addr = 0;
  	for (addr = 0xB0; addr <= 0xC3; addr++) {
  		max77823_read_reg(charger->i2c, addr, &data);
  		pr_debug("MAX77823 addr : 0x%02x data : 0x%02x
  ", addr, data);
  	}
  }
  
  static int max77823_get_vbus_state(struct max77823_charger_data *charger)
  {
  	u8 reg_data;
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_DETAILS_00, &reg_data);
  
  	if (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS)
  		reg_data = ((reg_data & MAX77823_WCIN_DTLS) >>
  			    MAX77823_WCIN_DTLS_SHIFT);
  	else
  		reg_data = ((reg_data & MAX77823_CHGIN_DTLS) >>
  			    MAX77823_CHGIN_DTLS_SHIFT);
  
  	switch (reg_data) {
  	case 0x00:
  		pr_debug("%s: VBUS is invalid. CHGIN < CHGIN_UVLO
  ",
  			__func__);
  		break;
  	case 0x01:
  		pr_info("%s: VBUS is invalid. CHGIN < MBAT+CHGIN2SYS" \
  			"and CHGIN > CHGIN_UVLO
  ", __func__);
  		break;
  	case 0x02:
  		pr_info("%s: VBUS is invalid. CHGIN > CHGIN_OVLO",
  			__func__);
  		break;
  	case 0x03:
  		pr_debug("%s: VBUS is valid. CHGIN < CHGIN_OVLO", __func__);
  		break;
  	default:
  		break;
  	}
  
  	return reg_data;
  }
  
  static int max77823_get_charger_state(struct max77823_charger_data *charger)
  {
  	int status = POWER_SUPPLY_STATUS_UNKNOWN;
  	u8 reg_data;
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_DETAILS_01, &reg_data);
  
  	pr_info("%s : charger status (0x%02x)
  ", __func__, reg_data);
  
  	reg_data &= 0x0f;
  
  	switch (reg_data)
  	{
  	case 0x00:
  	case 0x01:
  	case 0x02:
  		status = POWER_SUPPLY_STATUS_CHARGING;
  		break;
  	case 0x03:
  	case 0x04:
  		status = POWER_SUPPLY_STATUS_FULL;
  		break;
  	case 0x05:
  	case 0x06:
  	case 0x07:
  		status = POWER_SUPPLY_STATUS_NOT_CHARGING;
  		break;
  	case 0x08:
  	case 0xA:
  	case 0xB:
  		status = POWER_SUPPLY_STATUS_DISCHARGING;
  		break;
  	default:
  		status = POWER_SUPPLY_STATUS_UNKNOWN;
  		break;
  	}
  
  	return (int)status;
  }
  
  static int max77823_get_charger_present(struct max77823_charger_data *charger)
  {
  	u8 reg_data;
  	int ret;
  
  	ret = max77823_read_reg(charger->i2c, MAX77823_CHG_INT_OK, &reg_data);
  	if (ret < 0)
  		return 1;
  	pr_debug("%s:(0x%02x)
  ", __func__, reg_data);
  	return (reg_data >> MAX77823_DETBAT_SHIFT) & 1;
  }
  
  static int max77823_get_charging_health(struct max77823_charger_data *charger)
  {
  	int state;
  	int vbus_state;
  	int retry_cnt;
  	u8 chg_dtls_00, chg_dtls, reg_data;
  	u8 chg_cnfg_00, chg_cnfg_01 ,chg_cnfg_02, chg_cnfg_04, chg_cnfg_09, chg_cnfg_12;
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_DETAILS_01, &reg_data);
  	reg_data = ((reg_data & MAX77823_BAT_DTLS) >> MAX77823_BAT_DTLS_SHIFT);
  
  	pr_debug("%s: reg_data(0x%x)
  ", __func__, reg_data);
  	switch (reg_data) {
  	case 0x00:
  		pr_info("%s: No battery and the charger is suspended
  ",
  			__func__);
  		state = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
  		break;
  	case 0x01:
  		pr_info("%s: battery is okay "
  			"but its voltage is low(~VPQLB)
  ", __func__);
  		state = POWER_SUPPLY_HEALTH_GOOD;
  		break;
  	case 0x02:
  		pr_info("%s: battery dead
  ", __func__);
  		state = POWER_SUPPLY_HEALTH_DEAD;
  		break;
  	case 0x03:
  		state = POWER_SUPPLY_HEALTH_GOOD;
  		break;
  	case 0x04:
  		pr_info("%s: battery is okay " \
  			"but its voltage is low
  ", __func__);
  		state = POWER_SUPPLY_HEALTH_GOOD;
  		break;
  	case 0x05:
  		pr_info("%s: battery ovp
  ", __func__);
  		state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
  		break;
  	default:
  		pr_info("%s: battery unknown : 0x%d
  ", __func__, reg_data);
  		state = POWER_SUPPLY_HEALTH_UNKNOWN;
  		break;
  	}
  
  	if (state == POWER_SUPPLY_HEALTH_GOOD) {
  		/* VBUS OVP state return battery OVP state */
  		vbus_state = max77823_get_vbus_state(charger);
  		/* read CHG_DTLS and detecting battery terminal error */
  		max77823_read_reg(charger->i2c,
  				  MAX77823_CHG_DETAILS_01, &chg_dtls);
  		chg_dtls = ((chg_dtls & MAX77823_CHG_DTLS) >>
  			    MAX77823_CHG_DTLS_SHIFT);
  		max77823_read_reg(charger->i2c,
  				  MAX77823_CHG_CNFG_00, &chg_cnfg_00);
  
  		/* print the log at the abnormal case */
  		if((charger->is_charging == 1) && (chg_dtls & 0x08)) {
  			max77823_read_reg(charger->i2c,
  				MAX77823_CHG_DETAILS_00, &chg_dtls_00);
  			max77823_read_reg(charger->i2c,
  				MAX77823_CHG_CNFG_01, &chg_cnfg_01);
  			max77823_read_reg(charger->i2c,
  				MAX77823_CHG_CNFG_02, &chg_cnfg_02);
  			max77823_read_reg(charger->i2c,
  				MAX77823_CHG_CNFG_04, &chg_cnfg_04);
  			max77823_read_reg(charger->i2c,
  					MAX77823_CHG_CNFG_09, &chg_cnfg_09);
  			max77823_read_reg(charger->i2c,
  					MAX77823_CHG_CNFG_12, &chg_cnfg_12);
  
  			pr_info("%s: CHG_DTLS_00(0x%x), CHG_DTLS_01(0x%x), CHG_CNFG_00(0x%x)
  ",
  				__func__, chg_dtls_00, chg_dtls, chg_cnfg_00);
  			pr_info("%s:  CHG_CNFG_01(0x%x), CHG_CNFG_02(0x%x), CHG_CNFG_04(0x%x)
  ",
  				__func__, chg_cnfg_01, chg_cnfg_02, chg_cnfg_04);
  			pr_info("%s:  CHG_CNFG_09(0x%x), CHG_CNFG_12(0x%x)
  ",
  				__func__, chg_cnfg_09, chg_cnfg_12);
  		}
  
  		pr_debug("%s: vbus_state : 0x%x, chg_dtls : 0x%x chg_cnfg_00=0x%x
  ",
  				__func__, vbus_state, chg_dtls, chg_cnfg_00);
  		/*  OVP is higher priority */
  		if (vbus_state == 0x02) { /*  CHGIN_OVLO */
  			pr_info("%s: vbus ovp
  ", __func__);
  			state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
  			if (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS) {
  				retry_cnt = 0;
  				do {
  					msleep(50);
  					vbus_state = max77823_get_vbus_state(charger);
  				} while((retry_cnt++ < 2) && (vbus_state == 0x02));
  				if (vbus_state == 0x02) {
  					state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
  					pr_info("%s: wpc and over-voltage
  ", __func__);
  				} else
  					state = POWER_SUPPLY_HEALTH_GOOD;
  			}
  		} else if (((vbus_state == 0x0) || (vbus_state == 0x01)) &&(chg_dtls & 0x08) &&
  //				(chg_cnfg_00 & MAX77823_MODE_BUCK) &&
  //				(chg_cnfg_00 & MAX77823_MODE_CHGR) &&
  				(charger->cable_type != POWER_SUPPLY_TYPE_WIRELESS)) {
  			pr_info("%s: vbus is under
  ", __func__);
  			state = POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
  		}
  	}
  
  	max77823_test_read(charger);
  
  	return (int)state;
  }
  
  static u8 max77823_get_float_voltage_data(int float_voltage)
  {
  	u8 data;
  
  	if (float_voltage >= 4350)
  		data = (float_voltage - 3650) / 25 + 1;
  	else if (float_voltage == 4340)
  		data = 0x1c;
  	else
  		data = (float_voltage - 3650) / 25;
  
  	return data;
  }
  
  static int max77823_get_input_current(struct max77823_charger_data *charger)
  {
  	u8 reg_data;
  	int get_current = 0;
  
  	if (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS) {
  		max77823_read_reg(charger->i2c,
  			MAX77823_CHG_CNFG_10, &reg_data);
  		/* AND operation for removing the formal 2bit  */
  		reg_data = reg_data & 0x3F;
  
  		if (reg_data <= 0x3)
  			get_current = 60;
  		else
  			get_current = reg_data * 20;
  	} else {
  		max77823_read_reg(charger->i2c,
  			MAX77823_CHG_CNFG_09, &reg_data);
  		/* AND operation for removing the formal 1bit  */
  		reg_data = reg_data & 0x7F;
  
  		if (reg_data <= 0x3)
  			get_current = 100;
  		else if (reg_data >= 0x78)
  			get_current = 4000;
  		else {
  			int quotient, remainder;
  			quotient = reg_data / 3;
  			remainder = reg_data % 3;
  			if (remainder == 0)
  				get_current = quotient * 100;
  			else if (remainder == 1)
  				get_current = quotient * 100 + 33;
  			else
  				get_current = quotient * 100 + 67;
  		}
  	}
  
  	return get_current;
  }
  
  static void max77823_set_buck(struct max77823_charger_data *charger,
  		int enable)
  {
  	u8 reg_data;
  
  	max77823_read_reg(charger->i2c          ,
  		MAX77823_CHG_CNFG_00, &reg_data);
  
  	if (enable)
  		reg_data |= MAX77823_MODE_BUCK;
  	else
  		reg_data &= ~MAX77823_MODE_BUCK;
  
  	pr_info("%s: CHG_CNFG_00(0x%02x)
  ", __func__, reg_data);
  	max77823_write_reg(charger->i2c,
  			   MAX77823_CHG_CNFG_00, reg_data);
  }
  
  static void max77823_chg_cable_work(struct work_struct *work)
  {
  	struct max77823_charger_data *charger =
  	container_of(work, struct max77823_charger_data,chg_cable_work.work);
  	int quotient, remainder;
  	u8 reg_data;
  
  	pr_info("[2][NOT HV TA]
  ");
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_CNFG_09, &reg_data);
  
  	pr_debug("[%s]VALUE(%d)DATA(0x%x)
  ",
  		__func__, charger->charging_current_max,
  		reg_data);
  
  	quotient = (charger->charging_current_max - 1000) / 100;
  	remainder = (charger->charging_current_max - 1000) % 100;
  
  	if (remainder >= 67)
  		reg_data += ((quotient * 3) + 2);
  	else if (remainder >= 33)
  		reg_data += ((quotient * 3) + 1);
  	else if (remainder < 33)
  		reg_data += (quotient * 3);
  
  	max77823_write_reg(charger->i2c,
  			   MAX77823_CHG_CNFG_09, reg_data);
  
  	pr_info("[%s]VALUE(%d)DATA(0x%x)
  ",
  		__func__, charger->charging_current_max,
  		reg_data);
  }
  
  static void max77823_set_input_current(struct max77823_charger_data *charger,
  				       int input_current)
  {
  	u8 reg_data = 0;
  	int quotient, remainder;
  
  	/* disable only buck because power onoff test issue */
  	if (input_current <= 0) {
  		max77823_write_reg(charger->i2c,
  				   MAX77823_CHG_CNFG_09, 0x0F);
  		max77823_set_buck(charger, DISABLE);
  		return;
  	}
  	else
  		max77823_set_buck(charger, ENABLE);
  
  	if (charger->cable_type == POWER_SUPPLY_TYPE_MAINS) {
  		reg_data |= INPUT_CURRENT_1000mA;
  		max77823_write_reg(charger->i2c,
  				   MAX77823_CHG_CNFG_09, reg_data);
  
  		pr_info("[1][TA][0x%x]
  ", reg_data);
  		schedule_delayed_work(&charger->chg_cable_work, msecs_to_jiffies(2000));
  	} else if (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS) {
  		quotient = input_current / 20;
  		reg_data |= quotient;
  		max77823_write_reg(charger->i2c,
  				   MAX77823_CHG_CNFG_10, reg_data);
  	} else {
  		/* HV TA, etc */
  		cancel_delayed_work_sync(&charger->chg_cable_work);
  
  		quotient = input_current / 100;
  		remainder = input_current % 100;
  
  		if (remainder >= 67)
  			reg_data |= (quotient * 3) + 2;
  		else if (remainder >= 33)
  			reg_data |= (quotient * 3) + 1;
  		else if (remainder < 33)
  			reg_data |= quotient * 3;
  
  		max77823_write_reg(charger->i2c,
  				   MAX77823_CHG_CNFG_09, reg_data);
  
  		pr_info("[3][HV TA, etc][0x%x]
  ", reg_data);
  	}
  }
  
  static void max77823_set_charge_current(struct max77823_charger_data *charger,
  					int fast_charging_current)
  {
  	int curr_step = 50;
  	u8 reg_data;
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_CNFG_02, &reg_data);
  	reg_data &= ~MAX77823_CHG_CC;
  
  	if (!fast_charging_current) {
  		max77823_write_reg(charger->i2c,
  				   MAX77823_CHG_CNFG_02, reg_data);
  	} else {
  		reg_data |= (fast_charging_current / curr_step);
  
  		max77823_write_reg(charger->i2c,MAX77823_CHG_CNFG_02, reg_data);
  	}
  	pr_info("%s: reg_data(0x%02x), charging current(%d)
  ",
  		__func__, reg_data, fast_charging_current);
  
  }
  
  static void max77823_set_topoff_current(struct max77823_charger_data *charger,
  					int termination_current,
  					int termination_time)
  {
  	u8 reg_data;
  
  	if (termination_current >= 350)
  		reg_data = 0x07;
  	else if (termination_current >= 300)
  		reg_data = 0x06;
  	else if (termination_current >= 250)
  		reg_data = 0x05;
  	else if (termination_current >= 200)
  		reg_data = 0x04;
  	else if (termination_current >= 175)
  		reg_data = 0x03;
  	else if (termination_current >= 150)
  		reg_data = 0x02;
  	else if (termination_current >= 125)
  		reg_data = 0x01;
  	else
  		reg_data = 0x00;
  
  	/* the unit of timeout is second*/
  	termination_time = termination_time / 60;
  	reg_data |= ((termination_time / 10) << 3);
  	pr_info("%s: reg_data(0x%02x), topoff(%d)
  ",
  		__func__, reg_data, termination_current);
  
  	max77823_write_reg(charger->i2c,
  			   MAX77823_CHG_CNFG_03, reg_data);
  
  }
  
  static void max77823_set_charger_state(struct max77823_charger_data *charger,
  	int enable)
  {
  	u8 reg_data;
  
  	max77823_read_reg(charger->i2c, MAX77823_CHG_CNFG_00, &reg_data);
  
  	if (enable)
  		reg_data |= MAX77823_MODE_CHGR;
  	else
  		reg_data &= ~MAX77823_MODE_CHGR;
  
  	pr_debug("%s : CHG_CNFG_00(0x%02x)
  ", __func__, reg_data);
  
  	max77823_write_reg(charger->i2c,MAX77823_CHG_CNFG_00, reg_data);
  }
  
  static void max77823_charger_function_control(
  				struct max77823_charger_data *charger)
  {
  	const int usb_charging_current = get_charging_info(charger, POWER_SUPPLY_TYPE_USB)->fast_charging_current;
  	int set_charging_current, set_charging_current_max;
  	u8 chg_cnfg_00;
  
  	pr_info("####%s####
  ", __func__);
  
  	if (charger->cable_type == POWER_SUPPLY_TYPE_BATTERY) {
  		charger->is_charging = false;
  		charger->aicl_on = false;
  		set_charging_current = 0;
  		set_charging_current_max =
  			get_charging_info(charger, POWER_SUPPLY_TYPE_BATTERY)->input_current_limit;
  
  		max77823_read_reg(charger->i2c,
  				  MAX77823_CHG_CNFG_00, &chg_cnfg_00);
  		chg_cnfg_00 &= ~(CHG_CNFG_00_CHG_MASK
  				 | CHG_CNFG_00_OTG_MASK
  				 | CHG_CNFG_00_BUCK_MASK
  				 | CHG_CNFG_00_BOOST_MASK);
  
  		set_charging_current_max =
  			get_charging_info(charger, POWER_SUPPLY_TYPE_USB)->input_current_limit;
  		charger->charging_current = set_charging_current;
  		charger->charging_current_max = set_charging_current_max;
  
  		max77823_write_reg(charger->i2c,
  			MAX77823_CHG_CNFG_00, chg_cnfg_00);
  	} else {
  		charger->is_charging = true;
  		charger->charging_current_max =
  			get_charging_info(charger, charger->cable_type)->input_current_limit;
  		charger->charging_current =
  			get_charging_info(charger, charger->cable_type)->fast_charging_current;
  		/* decrease the charging current according to siop level */
  		set_charging_current =
  			charger->charging_current * charger->siop_level / 100;
  		if (set_charging_current > 0 &&
  		    set_charging_current < usb_charging_current)
  			set_charging_current = usb_charging_current;
  
  		set_charging_current_max =
  			charger->charging_current_max;
  
  		if (charger->siop_level < 100) {
  			if (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS) {
  				if (set_charging_current_max > SIOP_WIRELESS_INPUT_LIMIT_CURRENT) {
  					set_charging_current_max = SIOP_WIRELESS_INPUT_LIMIT_CURRENT;
  					if (set_charging_current > SIOP_WIRELESS_CHARGING_LIMIT_CURRENT)
  						set_charging_current = SIOP_WIRELESS_CHARGING_LIMIT_CURRENT;
  				}
  			} else {
  				if (set_charging_current_max > SIOP_INPUT_LIMIT_CURRENT) {
  					set_charging_current_max = SIOP_INPUT_LIMIT_CURRENT;
  					if (set_charging_current > SIOP_CHARGING_LIMIT_CURRENT)
  						set_charging_current = SIOP_CHARGING_LIMIT_CURRENT;
  				}
  			}
  		}
  	}
  
  	max77823_set_charger_state(charger, charger->is_charging);
  
  	/* if battery full, only disable charging  */
  	if ((charger->status == POWER_SUPPLY_STATUS_CHARGING) ||
  	    (charger->status == POWER_SUPPLY_STATUS_FULL) ||
  	    (charger->status == POWER_SUPPLY_STATUS_DISCHARGING)) {
  		/* current setting */
  		max77823_set_charge_current(charger,
  					    set_charging_current);
  		/* if battery is removed, disable input current and reenable input current
  		 *  to enable buck always */
  		max77823_set_input_current(charger,
  					   set_charging_current_max);
  		max77823_set_topoff_current(charger,
  					    get_charging_info(charger, charger->cable_type)->full_check_current_1st,
  					    get_charging_info(charger, charger->cable_type)->full_check_current_2nd);
  	}
  
  	pr_info("charging = %d, fc = %d, il = %d, t1 = %d, t2 = %d, cable = %d
  ",
  		charger->is_charging,
  		charger->charging_current,
  		charger->charging_current_max,
  		get_charging_info(charger, charger->cable_type)->full_check_current_1st,
  		get_charging_info(charger, charger->cable_type)->full_check_current_2nd,
  		charger->cable_type);
  
  	max77823_test_read(charger);
  
  }
  
  static void max77823_charger_initialize(struct max77823_charger_data *charger)
  {
  	u8 reg_data;
  	pr_info("%s
  ", __func__);
  
  	/* unmasked: CHGIN_I, WCIN_I, BATP_I, BYP_I	*/
  	max77823_write_reg(charger->i2c, MAX77823_CHG_INT_MASK, 0x9a);
  
  	/* unlock charger setting protect */
  	reg_data = (0x03 << 2);
  	max77823_write_reg(charger->i2c, MAX77823_CHG_CNFG_06, reg_data);
  
  	/*
  	 * fast charge timer disable
  	 * restart threshold disable
  	 * pre-qual charge enable(default)
  	 */
  	reg_data = (0x08 << 0) | (0x03 << 4);
  	max77823_write_reg(charger->i2c, MAX77823_CHG_CNFG_01, reg_data);
  
  	/*
  	 * charge current 466mA(default)
  	 * otg current limit 900mA
  	 */
  	max77823_read_reg(charger->i2c, MAX77823_CHG_CNFG_02, &reg_data);
  	reg_data |= (1 << 6);
  	max77823_write_reg(charger->i2c, MAX77823_CHG_CNFG_02, reg_data);
  
  	/*
  	 * top off current 100mA
  	 * top off timer 70min
  	 */
  	reg_data = 0x38;
  	max77823_write_reg(charger->i2c, MAX77823_CHG_CNFG_03, reg_data);
  
  	/*
  	 * cv voltage 4.2V or 4.35V
  	 * MINVSYS 3.6V(default)
  	 */
  	reg_data = max77823_get_float_voltage_data(charger->pdata->chg_float_voltage);
  	max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_04,
  			(reg_data << CHG_CNFG_04_CHG_CV_PRM_SHIFT),
  			CHG_CNFG_04_CHG_CV_PRM_MASK);
  	max77823_read_reg(charger->i2c, MAX77823_CHG_CNFG_04, &reg_data);
  	pr_info("%s: battery cv voltage 0x%x
  ", __func__, reg_data);
  
  	max77823_test_read(charger);
  
  }
  
  static int max77823_chg_get_property(struct power_supply *psy,
  			      enum power_supply_property psp,
  			      union power_supply_propval *val)
  {
  	struct max77823_charger_data *charger =
  		container_of(psy, struct max77823_charger_data, psy_chg);
  	u8 reg_data;
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_ONLINE:
  		val->intval = POWER_SUPPLY_TYPE_BATTERY;
  		if (max77823_read_reg(charger->i2c,
  			MAX77823_CHG_INT_OK, &reg_data) == 0) {
  			if (reg_data & MAX77823_WCIN_OK) {
  				val->intval = POWER_SUPPLY_TYPE_WIRELESS;
  				charger->wc_w_state = 1;
  			} else if (reg_data & MAX77823_CHGIN_OK) {
  				val->intval = POWER_SUPPLY_TYPE_MAINS;
  			}
  		}
  		break;
  	case POWER_SUPPLY_PROP_STATUS:
  		val->intval = max77823_get_charger_state(charger);
  		break;
  	case POWER_SUPPLY_PROP_PRESENT:
  		val->intval = max77823_get_charger_present(charger);
  		break;
  	case POWER_SUPPLY_PROP_CHARGE_TYPE:
  		if (!charger->is_charging)
  			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
  		else if (charger->aicl_on)
  		{
  			val->intval = POWER_SUPPLY_CHARGE_TYPE_SLOW;
  			pr_info("%s: slow-charging mode
  ", __func__);
  		}
  		else
  			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
  		break;
  	case POWER_SUPPLY_PROP_HEALTH:
  		val->intval = max77823_get_charging_health(charger);
  		break;
  	case POWER_SUPPLY_PROP_CHARGING_ENABLED:
  		val->intval = 0;
  		if (max77823_read_reg(charger->i2c, MAX77823_CHG_CNFG_12, &reg_data) == 0)
  			val->intval = (reg_data >> 5) & 1;
  		break;
  	case POWER_SUPPLY_PROP_CURRENT_MAX:
  	case POWER_SUPPLY_PROP_CURRENT_AVG:
  		val->intval = max77823_get_input_current(charger);
  		break;
  	case POWER_SUPPLY_PROP_CURRENT_NOW:
  		val->intval = max77823_get_input_current(charger);
  		pr_debug("%s : set-current(%dmA), current now(%dmA)
  ",
  			__func__, charger->charging_current, val->intval);
  		break;
  	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int max77823_chg_property_is_writeable(struct power_supply *psy,
                                                  enum power_supply_property psp)
  {
  	switch (psp) {
  	case POWER_SUPPLY_PROP_ONLINE:
  	case POWER_SUPPLY_PROP_CHARGING_ENABLED:
  	case POWER_SUPPLY_PROP_CURRENT_MAX:
  	case POWER_SUPPLY_PROP_CURRENT_NOW:
  		return 1;
  	default:
  		break;
  	}
  	return 0;
  }
  
  static int max77823_otg_regulator_nb(struct notifier_block *nb, unsigned long event, void *data)
  {
  	struct max77823_charger_data *charger = container_of(nb, struct max77823_charger_data, otg_regulator_nb);
  
  	if (event & (REGULATOR_EVENT_DISABLE | REGULATOR_EVENT_ENABLE | REGULATOR_EVENT_PRE_ENABLE)) {
  		max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_12,
  			(event & REGULATOR_EVENT_DISABLE) ? 0x20 : 0, 0x20);
  		if (event & REGULATOR_EVENT_DISABLE)
  			max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_00,
  				CHG_CNFG_00_CHG_MASK, CHG_CNFG_00_CHG_MASK);
  	}
  	return 0;
  }
  
  static void max77823_set_online(struct max77823_charger_data *charger, int type)
  {
  	union power_supply_propval value;
  
  	if (type == POWER_SUPPLY_TYPE_POWER_SHARING) {
  		psy_get_prop(charger, PS_PS, POWER_SUPPLY_PROP_STATUS, &value);
  		max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_00,
  				(value.intval) ? CHG_CNFG_00_OTG_CTRL : 0, CHG_CNFG_00_OTG_CTRL);
  		return;
  	}
  	charger->cable_type = type;
  	max77823_charger_function_control(charger);
  }
  
  static int max77823_chg_set_property(struct power_supply *psy,
  			  enum power_supply_property psp,
  			  const union power_supply_propval *val)
  {
  	struct max77823_charger_data *charger =
  		container_of(psy, struct max77823_charger_data, psy_chg);
  	int set_charging_current_max;
  	const int usb_charging_current = get_charging_info(charger, POWER_SUPPLY_TYPE_USB)->fast_charging_current;
  
  	switch (psp) {
  	/* val->intval : type */
  	case POWER_SUPPLY_PROP_STATUS:
  		charger->status = val->intval;
  		break;
  	case POWER_SUPPLY_PROP_ONLINE:
  		max77823_set_online(charger, val->intval);
  		break;
  
  	case POWER_SUPPLY_PROP_CHARGING_ENABLED:
  		max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_12,
  			val->intval ? 0x20 : 0, 0x20);
  		break;
  
  	/* val->intval : input charging current */
  	case POWER_SUPPLY_PROP_CURRENT_MAX:
  		charger->charging_current_max = val->intval;
  		break;
  	/*  val->intval : charging current */
  	case POWER_SUPPLY_PROP_CURRENT_AVG:
  		charger->charging_current = val->intval;
  		break;
  	/* val->intval : charging current */
  	case POWER_SUPPLY_PROP_CURRENT_NOW:
  		charger->charging_current = val->intval;
  		max77823_set_charge_current(charger, val->intval);
  		break;
  	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
  		charger->siop_level = val->intval;
  		if (charger->is_charging) {
  			/* decrease the charging current according to siop level */
  			int current_now =
  				charger->charging_current * val->intval / 100;
  
  			/* do forced set charging current */
  			if (current_now > 0 &&
  					current_now < usb_charging_current)
  				current_now = usb_charging_current;
  
  			if (charger->cable_type == POWER_SUPPLY_TYPE_MAINS || \
  				charger->cable_type == POWER_SUPPLY_TYPE_HV_MAINS) {
  				if (charger->siop_level < 100 ) {
  					set_charging_current_max = SIOP_INPUT_LIMIT_CURRENT;
  				} else {
  					set_charging_current_max =
  						charger->charging_current_max;
  				}
  
  				if (charger->siop_level < 100 &&
  				    current_now > SIOP_CHARGING_LIMIT_CURRENT)
  					current_now = SIOP_CHARGING_LIMIT_CURRENT;
  				max77823_set_input_current(charger,
  						   set_charging_current_max);
  			} else if (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS) {
  				if (charger->siop_level < 100 ) {
  					set_charging_current_max = SIOP_WIRELESS_INPUT_LIMIT_CURRENT;
  				} else {
  					set_charging_current_max =
  						charger->charging_current_max;
  				}
  
  				if (charger->siop_level < 100 &&
  						current_now > SIOP_WIRELESS_CHARGING_LIMIT_CURRENT)
  					current_now = SIOP_WIRELESS_CHARGING_LIMIT_CURRENT;
  				max77823_set_input_current(charger,
  					set_charging_current_max);
  			}
  
  			max77823_set_charge_current(charger, current_now);
  
  		}
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int max77823_otg_get_property(struct power_supply *psy,
  				enum power_supply_property psp,
  				union power_supply_propval *val)
  {
  	struct max77823_charger_data *charger =
  		container_of(psy, struct max77823_charger_data, psy_otg);
  	u8 data;
  
  	val->intval = 0;
  	switch (psp) {
  	case POWER_SUPPLY_PROP_ONLINE:
  		max77823_read_reg(charger->i2c, MAX77823_CHG_CNFG_00, &data);
  		val->intval = (0xc400 >> (data & 0x0f)) & 1;
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int max77823_otg_set_property(struct power_supply *psy,
  				enum power_supply_property psp,
  				const union power_supply_propval *val)
  {
  	struct max77823_charger_data *charger =
  		container_of(psy, struct max77823_charger_data, psy_otg);
  	static u8 chg_int_state;
  	u8 chg_cnfg_00;
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_ONLINE:
  		pr_info("%s: OTG %s
  ", __func__, val->intval > 0 ? "on" : "off");
  
  		if (val->intval) {
  			max77823_read_reg(charger->i2c, MAX77823_CHG_INT_MASK,
  				&chg_int_state);
  
  			/* disable charger interrupt: CHG_I, CHGIN_I */
  			/* enable charger interrupt: BYP_I */
  			max77823_update_reg(charger->i2c, MAX77823_CHG_INT_MASK,
  				MAX77823_CHG_IM | MAX77823_CHGIN_IM,
  				MAX77823_CHG_IM | MAX77823_CHGIN_IM | MAX77823_BYP_IM);
  			/* disable charger detection */
  #ifdef CONFIG_EXTCON_MAX77828
  			max77828_muic_set_chgdeten(DISABLE);
  #endif
  			/* OTG on, boost on */
  			max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_00,
  				CHG_CNFG_00_OTG_CTRL, CHG_CNFG_00_OTG_CTRL);
  
  			/* Update CHG_CNFG_11 to 0x50(5V) */
  			max77823_write_reg(charger->i2c,
  				MAX77823_CHG_CNFG_11, 0x50);
  		} else {
  			/* OTG off, boost off, (buck on) */
  			max77823_update_reg(charger->i2c, MAX77823_CHG_CNFG_00,
  				CHG_CNFG_00_BUCK_MASK, CHG_CNFG_00_BUCK_MASK | CHG_CNFG_00_OTG_CTRL);
  
  			/* Update CHG_CNFG_11 to 0x00(3V) */
  			max77823_write_reg(charger->i2c,
  				MAX77823_CHG_CNFG_11, 0x00);
  			mdelay(50);
  #ifdef CONFIG_EXTCON_MAX77828
  			max77828_muic_set_chgdeten(ENABLE);
  #endif
  			/* enable charger interrupt */
  			max77823_write_reg(charger->i2c,
  				MAX77823_CHG_INT_MASK, chg_int_state);
  		}
  		max77823_read_reg(charger->i2c, MAX77823_CHG_INT_MASK,
  			&chg_int_state);
  		max77823_read_reg(charger->i2c, MAX77823_CHG_CNFG_00,
  			&chg_cnfg_00);
  		pr_debug("%s: INT_MASK(0x%x), CHG_CNFG_00(0x%x)
  ",
  			__func__, chg_int_state, chg_cnfg_00);
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int max77823_debugfs_show(struct seq_file *s, void *data)
  {
  	struct max77823_charger_data *charger = s->private;
  	u8 reg;
  	u8 reg_data;
  
  	seq_printf(s, "MAX77823 CHARGER IC :
  ");
  	seq_printf(s, "===================
  ");
  	for (reg = 0xB0; reg <= 0xC3; reg++) {
  		max77823_read_reg(charger->i2c, reg, &reg_data);
  		seq_printf(s, "0x%02x:\t0x%02x
  ", reg, reg_data);
  	}
  
  	seq_printf(s, "
  ");
  	return 0;
  }
  
  static int max77823_debugfs_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, max77823_debugfs_show, inode->i_private);
  }
  
  static const struct file_operations max77823_debugfs_fops = {
  	.open           = max77823_debugfs_open,
  	.read           = seq_read,
  	.llseek         = seq_lseek,
  	.release        = single_release,
  };
  
  static void max77823_chg_isr_work(struct work_struct *work)
  {
  	struct max77823_charger_data *charger =
  		container_of(work, struct max77823_charger_data, isr_work.work);
  
  	union power_supply_propval val;
  
  	if (charger->pdata->full_check_type ==
  	    SEC_BATTERY_FULLCHARGED_CHGINT) {
  
  		val.intval = max77823_get_charger_state(charger);
  
  		switch (val.intval) {
  		case POWER_SUPPLY_STATUS_DISCHARGING:
  			pr_err("%s: Interrupted but Discharging
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_STATUS_NOT_CHARGING:
  			pr_err("%s: Interrupted but NOT Charging
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_STATUS_FULL:
  			pr_info("%s: Interrupted by Full
  ", __func__);
  			psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_STATUS, &val);
  			break;
  
  		case POWER_SUPPLY_STATUS_CHARGING:
  			pr_err("%s: Interrupted but Charging
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_STATUS_UNKNOWN:
  		default:
  			pr_err("%s: Invalid Charger Status
  ", __func__);
  			break;
  		}
  	}
  
  	if (charger->pdata->ovp_uvlo_check_type ==
  		SEC_BATTERY_OVP_UVLO_CHGINT) {
  		val.intval = max77823_get_charging_health(charger);
  		switch (val.intval) {
  		case POWER_SUPPLY_HEALTH_OVERHEAT:
  		case POWER_SUPPLY_HEALTH_COLD:
  			pr_err("%s: Interrupted but Hot/Cold
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_HEALTH_DEAD:
  			pr_err("%s: Interrupted but Dead
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
  		case POWER_SUPPLY_HEALTH_UNDERVOLTAGE:
  			pr_info("%s: Interrupted by OVP/UVLO
  ", __func__);
  			psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_HEALTH, &val);
  			break;
  
  		case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
  			pr_err("%s: Interrupted but Unspec
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_HEALTH_GOOD:
  			pr_err("%s: Interrupted but Good
  ", __func__);
  			break;
  
  		case POWER_SUPPLY_HEALTH_UNKNOWN:
  		default:
  			pr_err("%s: Invalid Charger Health
  ", __func__);
  			break;
  		}
  	}
  }
  
  static irqreturn_t max77823_chg_irq_thread(int irq, void *irq_data)
  {
  	struct max77823_charger_data *charger = irq_data;
  
  	pr_info("%s: Charger interrupt occured
  ", __func__);
  
  	if ((charger->pdata->full_check_type ==
  	     SEC_BATTERY_FULLCHARGED_CHGINT) ||
  	    (charger->pdata->ovp_uvlo_check_type ==
  	     SEC_BATTERY_OVP_UVLO_CHGINT))
  		schedule_delayed_work(&charger->isr_work, 0);
  
  	return IRQ_HANDLED;
  }
  
  static void wpc_detect_work(struct work_struct *work)
  {
  	struct max77823_charger_data *charger = container_of(work,
  						struct max77823_charger_data,
  						wpc_work.work);
  	int wc_w_state;
  	int retry_cnt;
  	union power_supply_propval value;
  	u8 reg_data;
  
  	pr_info("%s
  ", __func__);
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_INT_MASK, &reg_data);
  	reg_data &= ~(1 << 5);
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_INT_MASK, reg_data);
  
  	/* check and unlock */
  	check_charger_unlock_state(charger);
  
  	retry_cnt = 0;
  	do {
  		max77823_read_reg(charger->i2c,
  				  MAX77823_CHG_INT_OK, &reg_data);
  		wc_w_state = (reg_data & MAX77823_WCIN_OK)
  			>> MAX77823_WCIN_OK_SHIFT;
  		msleep(50);
  	} while((retry_cnt++ < 2) && (wc_w_state == 0));
  
  	if ((charger->wc_w_state == 0) && (wc_w_state == 1)) {
  		value.intval = 1;
  		psy_set_prop(charger, PS_WIRELESS, POWER_SUPPLY_PROP_ONLINE,
  				&value);
  		value.intval = POWER_SUPPLY_TYPE_WIRELESS;
  		pr_info("%s: wpc activated, set V_INT as PN
  ",
  				__func__);
  	} else if ((charger->wc_w_state == 1) && (wc_w_state == 0)) {
  		if (!charger->is_charging)
  			max77823_set_charger_state(charger, true);
  
  		retry_cnt = 0;
  		do {
  			max77823_read_reg(charger->i2c,
  					  MAX77823_CHG_DETAILS_01, &reg_data);
  			reg_data = ((reg_data & MAX77823_CHG_DTLS)
  				    >> MAX77823_CHG_DTLS_SHIFT);
  			msleep(50);
  		} while((retry_cnt++ < 2) && (reg_data == 0x8));
  		pr_info("%s: reg_data: 0x%x, charging: %d
  ", __func__,
  			reg_data, charger->is_charging);
  		if (!charger->is_charging)
  			max77823_set_charger_state(charger, false);
  		if ((reg_data != 0x08)
  		    && (charger->cable_type == POWER_SUPPLY_TYPE_WIRELESS)) {
  			pr_info("%s: wpc uvlo, but charging
  ", __func__);
  			queue_delayed_work(charger->wqueue, &charger->wpc_work,
  					   msecs_to_jiffies(500));
  			return;
  		} else {
  			value.intval = 0;
  			psy_set_prop(charger, PS_WIRELESS,
  					POWER_SUPPLY_PROP_ONLINE, &value);
  			pr_info("%s: wpc deactivated, set V_INT as PD
  ",
  					__func__);
  		}
  	}
  	pr_info("%s: w(%d to %d)
  ", __func__,
  		charger->wc_w_state, wc_w_state);
  
  	charger->wc_w_state = wc_w_state;
  
  	wake_unlock(&charger->wpc_wake_lock);
  }
  
  static irqreturn_t wpc_charger_irq(int irq, void *data)
  {
  	struct max77823_charger_data *charger = data;
  	unsigned long delay;
  	u8 reg_data;
  
  	max77823_read_reg(charger->i2c,
  		MAX77823_CHG_INT_MASK, &reg_data);
  	reg_data |= (1 << 5);
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_INT_MASK, reg_data);
  
  	wake_lock(&charger->wpc_wake_lock);
  #ifdef CONFIG_SAMSUNG_BATTERY_FACTORY
  	delay = msecs_to_jiffies(0);
  #else
  	if (charger->wc_w_state)
  		delay = msecs_to_jiffies(500);
  	else
  		delay = msecs_to_jiffies(0);
  #endif
  	queue_delayed_work(charger->wqueue, &charger->wpc_work,
  			delay);
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t max77823_bypass_irq(int irq, void *data)
  {
  	struct max77823_charger_data *charger = data;
  //	struct otg_notify *n = get_otg_notify();
  	u8 dtls_02;
  	u8 byp_dtls;
  	u8 chg_cnfg_00;
  	u8 vbus_state;
  
  	pr_info("%s: irq(%d)
  ", __func__, irq);
  
  	/* check and unlock */
  	check_charger_unlock_state(charger);
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_DETAILS_02,
  			  &dtls_02);
  
  	byp_dtls = ((dtls_02 & MAX77823_BYP_DTLS) >>
  				MAX77823_BYP_DTLS_SHIFT);
  	pr_info("%s: BYP_DTLS(0x%02x)
  ", __func__, byp_dtls);
  	vbus_state = max77823_get_vbus_state(charger);
  
  	if (byp_dtls & 0x1) {
  		pr_info("%s: bypass overcurrent limit
  ", __func__);
  //		send_otg_notify(n, NOTIFY_EVENT_OVERCURRENT, 0);
  
  		/* disable the register values just related to OTG and
  		   keep the values about the charging */
  		max77823_read_reg(charger->i2c,
  			MAX77823_CHG_CNFG_00, &chg_cnfg_00);
  		chg_cnfg_00 &= ~(CHG_CNFG_00_OTG_MASK
  				| CHG_CNFG_00_BOOST_MASK);
  		max77823_write_reg(charger->i2c,
  					MAX77823_CHG_CNFG_00,
  					chg_cnfg_00);
  	}
  	return IRQ_HANDLED;
  }
  
  static void max77823_chgin_isr_work(struct work_struct *work)
  {
  	struct max77823_charger_data *charger = container_of(work,
  				struct max77823_charger_data, chgin_work);
  	u8 chgin_dtls, chg_dtls, chg_cnfg_00, reg_data;
  	u8 prev_chgin_dtls = 0xff;
  	int bat_health;
  	union power_supply_propval value;
  	int stable_count = 0;
  
  	wake_lock(&charger->chgin_wake_lock);
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_INT_MASK, &reg_data);
  	reg_data |= (1 << 6);
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_INT_MASK, reg_data);
  
  	while (1) {
  		psy_get_prop(charger, PS_BATT, POWER_SUPPLY_PROP_HEALTH, &value);
  		bat_health = value.intval;
  
  		max77823_read_reg(charger->i2c, MAX77823_CHG_DETAILS_00,
  				&chgin_dtls);
  		chgin_dtls = ((chgin_dtls & MAX77823_CHGIN_DTLS) >>
  				MAX77823_CHGIN_DTLS_SHIFT);
  		max77823_read_reg(charger->i2c,
  				MAX77823_CHG_DETAILS_01, &chg_dtls);
  		chg_dtls = ((chg_dtls & MAX77823_CHG_DTLS) >>
  				MAX77823_CHG_DTLS_SHIFT);
  		max77823_read_reg(charger->i2c,
  			MAX77823_CHG_CNFG_00, &chg_cnfg_00);
  
  		if (prev_chgin_dtls == chgin_dtls) {
  			stable_count++;
  		} else {
  			stable_count = 0;
  			prev_chgin_dtls = chgin_dtls;
  		}
  		if (stable_count > 10)
  			break;
  		msleep(100);
  	}
  	pr_info("%s: irq(%d), chgin(0x%x), chg_dtls(0x%x) is_charging %d"
  			", bat_health=0x%x
  ",
  			__func__, charger->irq_chgin, chgin_dtls, chg_dtls,
  			charger->is_charging, bat_health);
  	if (charger->is_charging) {
  		if ((chgin_dtls == 0x02) && \
  			(bat_health != POWER_SUPPLY_HEALTH_OVERVOLTAGE)) {
  			pr_info("%s: charger is over voltage
  ", __func__);
  			value.intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
  			psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_HEALTH,
  					&value);
  		} else if (((chgin_dtls == 0x0) || (chgin_dtls == 0x01)) &&
  				(chg_dtls & 0x08) && \
  				(chg_cnfg_00 & MAX77823_MODE_BUCK) && \
  				(chg_cnfg_00 & MAX77823_MODE_CHGR) && \
  				(bat_health != POWER_SUPPLY_HEALTH_UNDERVOLTAGE) && \
  				(charger->cable_type != POWER_SUPPLY_TYPE_WIRELESS)) {
  			pr_info("%s, vbus_state : 0x%d, chg_state : 0x%d
  ",
  					__func__, chgin_dtls, chg_dtls);
  			pr_info("%s: vBus is undervoltage
  ", __func__);
  			value.intval = POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
  			psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_HEALTH,
  					&value);
  		} else if ((bat_health == POWER_SUPPLY_HEALTH_OVERVOLTAGE) &&
  				(chgin_dtls != 0x02)) {
  			pr_info("%s: vbus_state : 0x%d, chg_state : 0x%d
  ",
  					__func__, chgin_dtls, chg_dtls);
  			pr_info("%s: overvoltage->normal
  ", __func__);
  			value.intval = POWER_SUPPLY_HEALTH_GOOD;
  			psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_HEALTH,
  					&value);
  		} else if ((bat_health == POWER_SUPPLY_HEALTH_UNDERVOLTAGE) &&
  				!((chgin_dtls == 0) || (chgin_dtls == 1))) {
  			pr_info("%s: vbus_state : 0x%d, chg_state : 0x%d
  ",
  					__func__, chgin_dtls, chg_dtls);
  			pr_info("%s: undervoltage->normal
  ", __func__);
  			value.intval = POWER_SUPPLY_HEALTH_GOOD;
  			psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_HEALTH,
  					&value);
  			max77823_set_input_current(charger,
  					charger->charging_current_max);
  		}
  	}
  	max77823_read_reg(charger->i2c,
  		MAX77823_CHG_INT_MASK, &reg_data);
  	reg_data &= ~(1 << 6);
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_INT_MASK, reg_data);
  	wake_unlock(&charger->chgin_wake_lock);
  }
  
  static irqreturn_t max77823_chgin_irq(int irq, void *data)
  {
  	struct max77823_charger_data *charger = data;
  	queue_work(charger->wqueue, &charger->chgin_work);
  
  	return IRQ_HANDLED;
  }
  
  /* register chgin isr after sec_battery_probe */
  static void max77823_chgin_init_work(struct work_struct *work)
  {
  	struct max77823_charger_data *charger = container_of(work,
  						struct max77823_charger_data,
  						chgin_init_work.work);
  	int ret;
  	union power_supply_propval value;
  
  	pr_info("%s 
  ", __func__);
  	queue_work(charger->wqueue, &charger->chgin_work);
  	ret = request_threaded_irq(charger->irq_chgin, NULL,
  			max77823_chgin_irq, 0, "chgin-irq", charger);
  	if (ret < 0) {
  		pr_err("%s: fail to request chgin IRQ: %d: %d
  ",
  				__func__, charger->irq_chgin, ret);
  	}
  	value.intval = POWER_SUPPLY_TYPE_HV_MAINS;
  	psy_set_prop(charger, PS_BATT, POWER_SUPPLY_PROP_ONLINE, &value);
  	max77823_set_online(charger, value.intval);
  }
  
  #ifdef CONFIG_OF
  static int sec_charger_read_u32_index_dt(const struct device_node *np,
  				       const char *propname,
  				       u32 index, u32 *out_value)
  {
  	struct property *prop = of_find_property(np, propname, NULL);
  	u32 len = (index + 1) * sizeof(*out_value);
  
  	if (!prop)
  		return (-EINVAL);
  	if (!prop->value)
  		return (-ENODATA);
  	if (len > prop->length)
  		return (-EOVERFLOW);
  
  	*out_value = be32_to_cpup(((__be32 *)prop->value) + index);
  
  	return 0;
  }
  
  static int max77823_charger_parse_dt(struct max77823_charger_data *charger, struct device_node *np)
  {
  	sec_battery_platform_data_t *pdata = charger->pdata;
  	int ret = 0;
  
  	if (np == NULL) {
  		pr_err("%s np NULL
  ", __func__);
  		return -1;
  	} else {
  		int i, len;
  		const u32 *p;
  
  		ret = of_property_read_u32(np, "battery,chg_float_voltage",
  					&pdata->chg_float_voltage);
  		ret = of_property_read_u32(np, "battery,ovp_uvlo_check_type",
  					&pdata->ovp_uvlo_check_type);
  		ret = of_property_read_u32(np, "battery,full_check_type",
  					&pdata->full_check_type);
  
  		if (!pdata->charging_current) {
  			p = of_get_property(np, "battery,input_current_limit", &len);
  			len = len / sizeof(u32);
  			pdata->charging_current = kzalloc(sizeof(sec_charging_current_t) * len,
  						  GFP_KERNEL);
  
  			pdata->charging_current_entries = len;
  			for(i = 0; i < len; i++) {
  				struct sec_charging_current *scc = &pdata->charging_current[i];
  
  				ret = sec_charger_read_u32_index_dt(np,
  					 "battery,input_current_limit", i,
  					 &scc->input_current_limit);
  				ret = sec_charger_read_u32_index_dt(np,
  					 "battery,fast_charging_current", i,
  					 &scc->fast_charging_current);
  				ret = sec_charger_read_u32_index_dt(np,
  					 "battery,full_check_current_1st", i,
  					 &scc->full_check_current_1st);
  				ret = sec_charger_read_u32_index_dt(np,
  					 "battery,full_check_current_2nd", i,
  					 &scc->full_check_current_2nd);
  			}
  		}
  	}
  
  	return ret;
  }
  #endif
  
  static int max77823_charger_probe(struct platform_device *pdev)
  {
  	struct max77823_dev *max77823 = dev_get_drvdata(pdev->dev.parent);
  	struct max77823_platform_data *pdata = dev_get_platdata(max77823->dev);
  	struct max77823_charger_data *charger;
  	int ret = 0;
  	u8 reg_data;
  	struct regulator *reg_otg;
  
  	pr_info("%s: Max77823 Charger Driver Loading
  ", __func__);
  
  	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
  	if (!charger)
  		return -ENOMEM;
  
  	pdata->charger_data = kzalloc(sizeof(sec_battery_platform_data_t), GFP_KERNEL);
  	if (!pdata->charger_data) {
  		ret = -ENOMEM;
  		goto err_free;
  	}
  
  	mutex_init(&charger->charger_mutex);
  	charger->dev = &pdev->dev;
  	charger->i2c = max77823->charger;
  	charger->pdata = pdata->charger_data;
  	charger->aicl_on = false;
  	charger->siop_level = 100;
  
  #if defined(CONFIG_OF)
  	ret = max77823_charger_parse_dt(charger, pdev->dev.of_node);
  	if (ret < 0) {
  		pr_err("%s:dt error! ret[%d]
  ", __func__, ret);
  		goto err_free;
  	}
  #endif
  
  	platform_set_drvdata(pdev, charger);
  
  	reg_otg = devm_regulator_get(&pdev->dev, "usbotg");
  	if (PTR_ERR(reg_otg) == -EPROBE_DEFER) {
  		dev_err(&pdev->dev, "usbotg not ready, retry
  ");
  		ret = PTR_ERR(reg_otg);
  		goto err_free;
  	}
  	if (!IS_ERR(reg_otg)) {
  		charger->otg_regulator_nb.notifier_call =
  				max77823_otg_regulator_nb;
  		ret = regulator_register_notifier(reg_otg,
  				&charger->otg_regulator_nb);
  		if (ret != 0) {
  			dev_err(&pdev->dev,
  				"Failed to register regulator notifier: %d
  ",
  				ret);
  		} else {
  			dev_err(&pdev->dev, "usbotg notifier success
  ");
  		}
  	}
  
  	charger->psy_chg.name		= "max77823-charger";
  	charger->psy_chg.type		= POWER_SUPPLY_TYPE_UNKNOWN;
  	charger->psy_chg.get_property	= max77823_chg_get_property;
  	charger->psy_chg.set_property	= max77823_chg_set_property;
  	charger->psy_chg.properties	= max77823_charger_props;
  	charger->psy_chg.num_properties	= ARRAY_SIZE(max77823_charger_props);
  	charger->psy_chg.property_is_writeable  = max77823_chg_property_is_writeable;
  
  	charger->psy_otg.name		= "otg";
  	charger->psy_otg.type		= POWER_SUPPLY_TYPE_OTG;
  	charger->psy_otg.get_property	= max77823_otg_get_property;
  	charger->psy_otg.set_property	= max77823_otg_set_property;
  	charger->psy_otg.properties		= max77823_otg_props;
  	charger->psy_otg.num_properties	= ARRAY_SIZE(max77823_otg_props);
  
  	max77823_charger_initialize(charger);
  
  	(void) debugfs_create_file("max77823-regs",
  		S_IRUGO, NULL, (void *)charger, &max77823_debugfs_fops);
  
  	charger->wqueue =
  	    create_singlethread_workqueue(dev_name(&pdev->dev));
  	if (!charger->wqueue) {
  		pr_err("%s: Fail to Create Workqueue
  ", __func__);
  		kfree(pdata->charger_data);
  		ret = -ENOMEM;
  		goto err_free;
  	}
  	wake_lock_init(&charger->chgin_wake_lock, WAKE_LOCK_SUSPEND,
  			            "charger-chgin");
  	INIT_WORK(&charger->chgin_work, max77823_chgin_isr_work);
  	INIT_DELAYED_WORK(&charger->chgin_init_work, max77823_chgin_init_work);
  	INIT_DELAYED_WORK(&charger->chg_cable_work, max77823_chg_cable_work);
  	wake_lock_init(&charger->wpc_wake_lock, WAKE_LOCK_SUSPEND,
  					       "charger-wpc");
  	INIT_DELAYED_WORK(&charger->wpc_work, wpc_detect_work);
  	ret = power_supply_register(&pdev->dev, &charger->psy_otg);
  	if (ret) {
  		pr_err("%s: Failed to Register psy_otg
  ", __func__);
  		goto err_workqueue;
  	}
  	ret = power_supply_register(&pdev->dev, &charger->psy_chg);
  	if (ret) {
  		pr_err("%s: Failed to Register psy_chg
  ", __func__);
  		goto err_psy_unreg_otg;
  	}
  
  	if (charger->pdata->chg_irq) {
  		INIT_DELAYED_WORK(&charger->isr_work, max77823_chg_isr_work);
  
  		ret = request_threaded_irq(charger->pdata->chg_irq,
  				NULL, max77823_chg_irq_thread,
  				charger->pdata->chg_irq_attr,
  				"charger-irq", charger);
  		if (ret) {
  			pr_err("%s: Failed to Request IRQ
  ", __func__);
  			goto err_irq;
  		}
  
  			ret = enable_irq_wake(charger->pdata->chg_irq);
  			if (ret < 0)
  				pr_err("%s: Failed to Enable Wakeup Source(%d)
  ",
  					__func__, ret);
  		}
  
  	charger->wc_w_irq = pdata->irq_base + MAX77823_CHG_IRQ_WCIN_I;
  	ret = request_threaded_irq(charger->wc_w_irq,
  				   NULL, wpc_charger_irq,
  				   IRQF_TRIGGER_FALLING,
  				   "wpc-int", charger);
  	if (ret) {
  		pr_err("%s: Failed to Request IRQ
  ", __func__);
  		goto err_wc_irq;
  	}
  
  	max77823_read_reg(charger->i2c,
  			  MAX77823_CHG_INT_OK, &reg_data);
  	charger->wc_w_state = (reg_data & MAX77823_WCIN_OK)
  		>> MAX77823_WCIN_OK_SHIFT;
  
  	charger->irq_chgin = pdata->irq_base + MAX77823_CHG_IRQ_CHGIN_I;
  	/* enable chgin irq after sec_battery_probe */
  	queue_delayed_work(charger->wqueue, &charger->chgin_init_work,
  			msecs_to_jiffies(3000));
  
  	charger->irq_bypass = pdata->irq_base + MAX77823_CHG_IRQ_BYP_I;
  	ret = request_threaded_irq(charger->irq_bypass, NULL,
  			max77823_bypass_irq, 0, "bypass-irq", charger);
  	if (ret < 0)
  		pr_err("%s: fail to request bypass IRQ: %d: %d
  ",
  				__func__, charger->irq_bypass, ret);
  
  	pr_info("%s: MAX77823 Charger Driver Loaded
  ", __func__);
  
  	return 0;
  
  err_wc_irq:
  	if (charger->pdata->chg_irq)
  		free_irq(charger->pdata->chg_irq, NULL);
  err_irq:
  	power_supply_unregister(&charger->psy_chg);
  err_psy_unreg_otg:
  	power_supply_unregister(&charger->psy_otg);
  err_workqueue:
  	destroy_workqueue(charger->wqueue);
  err_free:
  	kfree(charger);
  
  	return ret;
  }
  
  static int max77823_charger_remove(struct platform_device *pdev)
  {
  	struct max77823_charger_data *charger =
  		platform_get_drvdata(pdev);
  //	int i;
  
  	destroy_workqueue(charger->wqueue);
  	free_irq(charger->wc_w_irq, NULL);
  	free_irq(charger->pdata->chg_irq, NULL);
  	power_supply_unregister(&charger->psy_chg);
  //	for (i = 0; i < ARRAY_SIZE(charger->psy_ref); i++)
  //		power_supply_put(charger->psy_ref[i]);
  	kfree(charger);
  
  	return 0;
  }
  
  #if defined CONFIG_PM
  static int max77823_charger_suspend(struct device *dev)
  {
  	return 0;
  }
  
  static int max77823_charger_resume(struct device *dev)
  {
  	return 0;
  }
  #else
  #define max77823_charger_suspend NULL
  #define max77823_charger_resume NULL
  #endif
  
  static void max77823_charger_shutdown(struct device *dev)
  {
  /*  No need to turn off charging when device is going to poweroff */
  #if 0
  	struct max77823_charger_data *charger =
  				dev_get_drvdata(dev);
  	u8 reg_data;
  
  	pr_info("%s: MAX77823 Charger driver shutdown
  ", __func__);
  	if (!charger->i2c) {
  		pr_err("%s: no max77823 i2c client
  ", __func__);
  		return;
  	}
  	reg_data = 0x04;
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_CNFG_00, reg_data);
  	reg_data = 0x0F;
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_CNFG_09, reg_data);
  	reg_data = 0x19;
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_CNFG_10, reg_data);
  	reg_data = 0x67;
  	max77823_write_reg(charger->i2c,
  		MAX77823_CHG_CNFG_12, reg_data);
  #endif
  	pr_info("func:%s 
  ", __func__);
  }
  
  #ifdef CONFIG_OF
  static struct of_device_id max77823_charger_dt_ids[] = {
  	{ .compatible = "samsung,max77823-charger" },
  	{ }
  };
  MODULE_DEVICE_TABLE(of, max77823_charger_dt_ids);
  #endif
  
  static SIMPLE_DEV_PM_OPS(max77823_charger_pm_ops, max77823_charger_suspend,
  			 max77823_charger_resume);
  
  static struct platform_driver max77823_charger_driver = {
  	.driver = {
  		.name = "max77823-charger",
  		.owner = THIS_MODULE,
  #ifdef CONFIG_PM
  		.pm = &max77823_charger_pm_ops,
  #endif
  		.shutdown = max77823_charger_shutdown,
  #ifdef CONFIG_OF
  		.of_match_table = max77823_charger_dt_ids,
  #endif
  	},
  	.probe = max77823_charger_probe,
  	.remove = max77823_charger_remove,
  };
  
  static int __init max77823_charger_init(void)
  {
  	pr_info("%s : 
  ", __func__);
  	return platform_driver_register(&max77823_charger_driver);
  }
  
  static void __exit max77823_charger_exit(void)
  {
  	platform_driver_unregister(&max77823_charger_driver);
  }
  
  module_init(max77823_charger_init);
  module_exit(max77823_charger_exit);
  
  MODULE_DESCRIPTION("Samsung MAX77823 Charger Driver");
  MODULE_AUTHOR("Samsung Electronics");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:max77823-charger");