drivers/extcon/extcon-max14577.c - kernel/msm-4.9 - Gitiles

 /*
  * extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC
  *
  * Copyright (C) 2013 Samsung Electrnoics
  * Chanwoo Choi <cw00.choi@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/max14577.h>
 #include <linux/mfd/max14577-private.h>
 #include <linux/extcon.h>

 #define	DEV_NAME			"max14577-muic"
 #define	DELAY_MS_DEFAULT		17000		/* unit: millisecond */

 enum max14577_muic_adc_debounce_time {
 	ADC_DEBOUNCE_TIME_5MS = 0,
 	ADC_DEBOUNCE_TIME_10MS,
 	ADC_DEBOUNCE_TIME_25MS,
 	ADC_DEBOUNCE_TIME_38_62MS,
 };

 enum max14577_muic_status {
 	MAX14577_MUIC_STATUS1 = 0,
 	MAX14577_MUIC_STATUS2 = 1,
 	MAX14577_MUIC_STATUS_END,
 };

 struct max14577_muic_info {
 	struct device *dev;
 	struct max14577 *max14577;
 	struct extcon_dev *edev;
 	int prev_cable_type;
 	int prev_chg_type;
 	u8 status[MAX14577_MUIC_STATUS_END];

 	bool irq_adc;
 	bool irq_chg;
 	struct work_struct irq_work;
 	struct mutex mutex;

 	/*
 	 * Use delayed workqueue to detect cable state and then
 	 * notify cable state to notifiee/platform through uevent.
 	 * After completing the booting of platform, the extcon provider
 	 * driver should notify cable state to upper layer.
 	 */
 	struct delayed_work wq_detcable;

 	/*
 	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 	 * h/w path of COMP2/COMN1 on CONTROL1 register.
 	 */
 	int path_usb;
 	int path_uart;
 };

 enum max14577_muic_cable_group {
 	MAX14577_CABLE_GROUP_ADC = 0,
 	MAX14577_CABLE_GROUP_CHG,
 };

 /**
  * struct max14577_muic_irq
  * @irq: the index of irq list of MUIC device.
  * @name: the name of irq.
  * @virq: the virtual irq to use irq domain
  */
 struct max14577_muic_irq {
 	unsigned int irq;
 	const char *name;
 	unsigned int virq;
 };

 static struct max14577_muic_irq muic_irqs[] = {
 	{ MAX14577_IRQ_INT1_ADC,	"muic-ADC" },
 	{ MAX14577_IRQ_INT1_ADCLOW,	"muic-ADCLOW" },
 	{ MAX14577_IRQ_INT1_ADCERR,	"muic-ADCError" },
 	{ MAX14577_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
 	{ MAX14577_IRQ_INT2_CHGDETRUN,	"muic-CHGDETRUN" },
 	{ MAX14577_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
 	{ MAX14577_IRQ_INT2_DBCHG,	"muic-DBCHG" },
 	{ MAX14577_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
 };

 /* Define supported accessory type */
 enum max14577_muic_acc_type {
 	MAX14577_MUIC_ADC_GROUND = 0x0,
 	MAX14577_MUIC_ADC_SEND_END_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
 	MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
 	MAX14577_MUIC_ADC_RESERVED_ACC_1,
 	MAX14577_MUIC_ADC_RESERVED_ACC_2,
 	MAX14577_MUIC_ADC_RESERVED_ACC_3,
 	MAX14577_MUIC_ADC_RESERVED_ACC_4,
 	MAX14577_MUIC_ADC_RESERVED_ACC_5,
 	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
 	MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
 	MAX14577_MUIC_ADC_TTY_CONVERTER,
 	MAX14577_MUIC_ADC_UART_CABLE,
 	MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
 	MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
 	MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
 	MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
 	MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
 	MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
 	MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
 	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
 	MAX14577_MUIC_ADC_OPEN,
 };

 /* max14577 MUIC device support below list of accessories(external connector) */
 enum {
 	EXTCON_CABLE_USB = 0,
 	EXTCON_CABLE_TA,
 	EXTCON_CABLE_FAST_CHARGER,
 	EXTCON_CABLE_SLOW_CHARGER,
 	EXTCON_CABLE_CHARGE_DOWNSTREAM,
 	EXTCON_CABLE_JIG_USB_ON,
 	EXTCON_CABLE_JIG_USB_OFF,
 	EXTCON_CABLE_JIG_UART_OFF,
 	EXTCON_CABLE_JIG_UART_ON,

 	_EXTCON_CABLE_NUM,
 };

 static const char *max14577_extcon_cable[] = {
 	[EXTCON_CABLE_USB]			= "USB",
 	[EXTCON_CABLE_TA]			= "TA",
 	[EXTCON_CABLE_FAST_CHARGER]		= "Fast-charger",
 	[EXTCON_CABLE_SLOW_CHARGER]		= "Slow-charger",
 	[EXTCON_CABLE_CHARGE_DOWNSTREAM]	= "Charge-downstream",
 	[EXTCON_CABLE_JIG_USB_ON]		= "JIG-USB-ON",
 	[EXTCON_CABLE_JIG_USB_OFF]		= "JIG-USB-OFF",
 	[EXTCON_CABLE_JIG_UART_OFF]		= "JIG-UART-OFF",
 	[EXTCON_CABLE_JIG_UART_ON]		= "JIG-UART-ON",

 	NULL,
 };

 /*
  * max14577_muic_set_debounce_time - Set the debounce time of ADC
  * @info: the instance including private data of max14577 MUIC
  * @time: the debounce time of ADC
  */
 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
 		enum max14577_muic_adc_debounce_time time)
 {
 	u8 ret;

 	switch (time) {
 	case ADC_DEBOUNCE_TIME_5MS:
 	case ADC_DEBOUNCE_TIME_10MS:
 	case ADC_DEBOUNCE_TIME_25MS:
 	case ADC_DEBOUNCE_TIME_38_62MS:
 		ret = max14577_update_reg(info->max14577->regmap,
 					  MAX14577_MUIC_REG_CONTROL3,
 					  CTRL3_ADCDBSET_MASK,
 					  time << CTRL3_ADCDBSET_SHIFT);
 		if (ret) {
 			dev_err(info->dev, "failed to set ADC debounce time\n");
 			return ret;
 		}
 		break;
 	default:
 		dev_err(info->dev, "invalid ADC debounce time\n");
 		return -EINVAL;
 	}

 	return 0;
 };

 /*
  * max14577_muic_set_path - Set hardware line according to attached cable
  * @info: the instance including private data of max14577 MUIC
  * @value: the path according to attached cable
  * @attached: the state of cable (true:attached, false:detached)
  *
  * The max14577 MUIC device share outside H/W line among a varity of cables
  * so, this function set internal path of H/W line according to the type of
  * attached cable.
  */
 static int max14577_muic_set_path(struct max14577_muic_info *info,
 		u8 val, bool attached)
 {
 	int ret = 0;
 	u8 ctrl1, ctrl2 = 0;

 	/* Set open state to path before changing hw path */
 	ret = max14577_update_reg(info->max14577->regmap,
 				MAX14577_MUIC_REG_CONTROL1,
 				CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
 	if (ret < 0) {
 		dev_err(info->dev, "failed to update MUIC register\n");
 		return ret;
 	}

 	if (attached)
 		ctrl1 = val;
 	else
 		ctrl1 = CTRL1_SW_OPEN;

 	ret = max14577_update_reg(info->max14577->regmap,
 				MAX14577_MUIC_REG_CONTROL1,
 				CLEAR_IDBEN_MICEN_MASK, ctrl1);
 	if (ret < 0) {
 		dev_err(info->dev, "failed to update MUIC register\n");
 		return ret;
 	}

 	if (attached)
 		ctrl2 |= CTRL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
 	else
 		ctrl2 |= CTRL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */

 	ret = max14577_update_reg(info->max14577->regmap,
 			MAX14577_REG_CONTROL2,
 			CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
 	if (ret < 0) {
 		dev_err(info->dev, "failed to update MUIC register\n");
 		return ret;
 	}

 	dev_dbg(info->dev,
 		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 		ctrl1, ctrl2, attached ? "attached" : "detached");

 	return 0;
 }

 /*
  * max14577_muic_get_cable_type - Return cable type and check cable state
  * @info: the instance including private data of max14577 MUIC
  * @group: the path according to attached cable
  * @attached: store cable state and return
  *
  * This function check the cable state either attached or detached,
  * and then divide precise type of cable according to cable group.
  *	- max14577_CABLE_GROUP_ADC
  *	- max14577_CABLE_GROUP_CHG
  */
 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
 		enum max14577_muic_cable_group group, bool *attached)
 {
 	int cable_type = 0;
 	int adc;
 	int chg_type;

 	switch (group) {
 	case MAX14577_CABLE_GROUP_ADC:
 		/*
 		 * Read ADC value to check cable type and decide cable state
 		 * according to cable type
 		 */
 		adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
 		adc >>= STATUS1_ADC_SHIFT;

 		/*
 		 * Check current cable state/cable type and store cable type
 		 * (info->prev_cable_type) for handling cable when cable is
 		 * detached.
 		 */
 		if (adc == MAX14577_MUIC_ADC_OPEN) {
 			*attached = false;

 			cable_type = info->prev_cable_type;
 			info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
 		} else {
 			*attached = true;

 			cable_type = info->prev_cable_type = adc;
 		}
 		break;
 	case MAX14577_CABLE_GROUP_CHG:
 		/*
 		 * Read charger type to check cable type and decide cable state
 		 * according to type of charger cable.
 		 */
 		chg_type = info->status[MAX14577_MUIC_STATUS2] &
 			STATUS2_CHGTYP_MASK;
 		chg_type >>= STATUS2_CHGTYP_SHIFT;

 		if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
 			*attached = false;

 			cable_type = info->prev_chg_type;
 			info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
 		} else {
 			*attached = true;

 			/*
 			 * Check current cable state/cable type and store cable
 			 * type(info->prev_chg_type) for handling cable when
 			 * charger cable is detached.
 			 */
 			cable_type = info->prev_chg_type = chg_type;
 		}

 		break;
 	default:
 		dev_err(info->dev, "Unknown cable group (%d)\n", group);
 		cable_type = -EINVAL;
 		break;
 	}

 	return cable_type;
 }

 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
 		int cable_type, bool attached)
 {
 	char cable_name[32];
 	int ret = 0;
 	u8 path = CTRL1_SW_OPEN;

 	dev_dbg(info->dev,
 		"external connector is %s (adc:0x%02x)\n",
 		attached ? "attached" : "detached", cable_type);

 	switch (cable_type) {
 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:	/* ADC_JIG_USB_OFF */
 		/* PATH:AP_USB */
 		strcpy(cable_name, "JIG-USB-OFF");
 		path = CTRL1_SW_USB;
 		break;
 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:	/* ADC_JIG_USB_ON */
 		/* PATH:AP_USB */
 		strcpy(cable_name, "JIG-USB-ON");
 		path = CTRL1_SW_USB;
 		break;
 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:	/* ADC_JIG_UART_OFF */
 		/* PATH:AP_UART */
 		strcpy(cable_name, "JIG-UART-OFF");
 		path = CTRL1_SW_UART;
 		break;
 	default:
 		dev_err(info->dev, "failed to detect %s jig cable\n",
 			attached ? "attached" : "detached");
 		return -EINVAL;
 	}

 	ret = max14577_muic_set_path(info, path, attached);
 	if (ret < 0)
 		return ret;

 	extcon_set_cable_state(info->edev, cable_name, attached);

 	return 0;
 }

 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
 {
 	int cable_type;
 	bool attached;
 	int ret = 0;

 	/* Check accessory state which is either detached or attached */
 	cable_type = max14577_muic_get_cable_type(info,
 				MAX14577_CABLE_GROUP_ADC, &attached);

 	dev_dbg(info->dev,
 		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 		attached ? "attached" : "detached", cable_type,
 		info->prev_cable_type);

 	switch (cable_type) {
 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
 	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
 		/* JIG */
 		ret = max14577_muic_jig_handler(info, cable_type, attached);
 		if (ret < 0)
 			return ret;
 		break;
 	case MAX14577_MUIC_ADC_GROUND:
 	case MAX14577_MUIC_ADC_SEND_END_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
 	case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
 	case MAX14577_MUIC_ADC_RESERVED_ACC_1:
 	case MAX14577_MUIC_ADC_RESERVED_ACC_2:
 	case MAX14577_MUIC_ADC_RESERVED_ACC_3:
 	case MAX14577_MUIC_ADC_RESERVED_ACC_4:
 	case MAX14577_MUIC_ADC_RESERVED_ACC_5:
 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 	case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
 	case MAX14577_MUIC_ADC_TTY_CONVERTER:
 	case MAX14577_MUIC_ADC_UART_CABLE:
 	case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
 	case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
 	case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
 	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
 	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 		/*
 		 * This accessory isn't used in general case if it is specially
 		 * needed to detect additional accessory, should implement
 		 * proper operation when this accessory is attached/detached.
 		 */
 		dev_info(info->dev,
 			"accessory is %s but it isn't used (adc:0x%x)\n",
 			attached ? "attached" : "detached", cable_type);
 		return -EAGAIN;
 	default:
 		dev_err(info->dev,
 			"failed to detect %s accessory (adc:0x%x)\n",
 			attached ? "attached" : "detached", cable_type);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
 {
 	int chg_type;
 	bool attached;
 	int ret = 0;

 	chg_type = max14577_muic_get_cable_type(info,
 				MAX14577_CABLE_GROUP_CHG, &attached);

 	dev_dbg(info->dev,
 		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 			attached ? "attached" : "detached",
 			chg_type, info->prev_chg_type);

 	switch (chg_type) {
 	case MAX14577_CHARGER_TYPE_USB:
 		/* PATH:AP_USB */
 		ret = max14577_muic_set_path(info, info->path_usb, attached);
 		if (ret < 0)
 			return ret;

 		extcon_set_cable_state(info->edev, "USB", attached);
 		break;
 	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 		extcon_set_cable_state(info->edev, "TA", attached);
 		break;
 	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 		extcon_set_cable_state(info->edev,
 				"Charge-downstream", attached);
 		break;
 	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 		extcon_set_cable_state(info->edev, "Slow-charger", attached);
 		break;
 	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 		extcon_set_cable_state(info->edev, "Fast-charger", attached);
 		break;
 	case MAX14577_CHARGER_TYPE_NONE:
 	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 		break;
 	default:
 		dev_err(info->dev,
 			"failed to detect %s accessory (chg_type:0x%x)\n",
 			attached ? "attached" : "detached", chg_type);
 		return -EINVAL;
 	}

 	return 0;
 }

 static void max14577_muic_irq_work(struct work_struct *work)
 {
 	struct max14577_muic_info *info = container_of(work,
 			struct max14577_muic_info, irq_work);
 	int ret = 0;

 	if (!info->edev)
 		return;

 	mutex_lock(&info->mutex);

 	ret = max14577_bulk_read(info->max14577->regmap,
 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
 	if (ret) {
 		dev_err(info->dev, "failed to read MUIC register\n");
 		mutex_unlock(&info->mutex);
 		return;
 	}

 	if (info->irq_adc) {
 		ret = max14577_muic_adc_handler(info);
 		info->irq_adc = false;
 	}
 	if (info->irq_chg) {
 		ret = max14577_muic_chg_handler(info);
 		info->irq_chg = false;
 	}

 	if (ret < 0)
 		dev_err(info->dev, "failed to handle MUIC interrupt\n");

 	mutex_unlock(&info->mutex);

 	return;
 }

 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
 {
 	struct max14577_muic_info *info = data;
 	int i, irq_type = -1;

 	/*
 	 * We may be called multiple times for different nested IRQ-s.
 	 * Including changes in INT1_ADC and INT2_CGHTYP at once.
 	 * However we only need to know whether it was ADC, charger
 	 * or both interrupts so decode IRQ and turn on proper flags.
 	 */
 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 		if (irq == muic_irqs[i].virq)
 			irq_type = muic_irqs[i].irq;

 	switch (irq_type) {
 	case MAX14577_IRQ_INT1_ADC:
 	case MAX14577_IRQ_INT1_ADCLOW:
 	case MAX14577_IRQ_INT1_ADCERR:
 		/* Handle all of accessory except for
 		   type of charger accessory */
 		info->irq_adc = true;
 		break;
 	case MAX14577_IRQ_INT2_CHGTYP:
 	case MAX14577_IRQ_INT2_CHGDETRUN:
 	case MAX14577_IRQ_INT2_DCDTMR:
 	case MAX14577_IRQ_INT2_DBCHG:
 	case MAX14577_IRQ_INT2_VBVOLT:
 		/* Handle charger accessory */
 		info->irq_chg = true;
 		break;
 	default:
 		dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
 				irq_type);
 		return IRQ_HANDLED;
 	}
 	schedule_work(&info->irq_work);

 	return IRQ_HANDLED;
 }

 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
 {
 	int ret = 0;
 	int adc;
 	int chg_type;
 	bool attached;

 	mutex_lock(&info->mutex);

 	/* Read STATUSx register to detect accessory */
 	ret = max14577_bulk_read(info->max14577->regmap,
 			MAX14577_MUIC_REG_STATUS1, info->status, 2);
 	if (ret) {
 		dev_err(info->dev, "failed to read MUIC register\n");
 		mutex_unlock(&info->mutex);
 		return ret;
 	}

 	adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
 					&attached);
 	if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
 		ret = max14577_muic_adc_handler(info);
 		if (ret < 0) {
 			dev_err(info->dev, "Cannot detect accessory\n");
 			mutex_unlock(&info->mutex);
 			return ret;
 		}
 	}

 	chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
 					&attached);
 	if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
 		ret = max14577_muic_chg_handler(info);
 		if (ret < 0) {
 			dev_err(info->dev, "Cannot detect charger accessory\n");
 			mutex_unlock(&info->mutex);
 			return ret;
 		}
 	}

 	mutex_unlock(&info->mutex);

 	return 0;
 }

 static void max14577_muic_detect_cable_wq(struct work_struct *work)
 {
 	struct max14577_muic_info *info = container_of(to_delayed_work(work),
 				struct max14577_muic_info, wq_detcable);

 	max14577_muic_detect_accessory(info);
 }

 static int max14577_muic_probe(struct platform_device *pdev)
 {
 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 	struct max14577_muic_info *info;
 	int delay_jiffies;
 	int ret;
 	int i;
 	u8 id;

 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		dev_err(&pdev->dev, "failed to allocate memory\n");
 		return -ENOMEM;
 	}
 	info->dev = &pdev->dev;
 	info->max14577 = max14577;

 	platform_set_drvdata(pdev, info);
 	mutex_init(&info->mutex);

 	INIT_WORK(&info->irq_work, max14577_muic_irq_work);

 	/* Support irq domain for max14577 MUIC device */
 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 		struct max14577_muic_irq *muic_irq = &muic_irqs[i];
 		unsigned int virq = 0;

 		virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
 		if (!virq)
 			return -EINVAL;
 		muic_irq->virq = virq;

 		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 				max14577_muic_irq_handler,
 				IRQF_NO_SUSPEND,
 				muic_irq->name, info);
 		if (ret) {
 			dev_err(&pdev->dev,
 				"failed: irq request (IRQ: %d,"
 				" error :%d)\n",
 				muic_irq->irq, ret);
 			return ret;
 		}
 	}

 	/* Initialize extcon device */
 	info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL);
 	if (!info->edev) {
 		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 		return -ENOMEM;
 	}
 	info->edev->name = DEV_NAME;
 	info->edev->supported_cable = max14577_extcon_cable;
 	ret = extcon_dev_register(info->edev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register extcon device\n");
 		return ret;
 	}

 	/* Default h/w line path */
 	info->path_usb = CTRL1_SW_USB;
 	info->path_uart = CTRL1_SW_UART;
 	delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);

 	/* Set initial path for UART */
 	max14577_muic_set_path(info, info->path_uart, true);

 	/* Check revision number of MUIC device*/
 	ret = max14577_read_reg(info->max14577->regmap,
 			MAX14577_REG_DEVICEID, &id);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to read revision number\n");
 		goto err_extcon;
 	}
 	dev_info(info->dev, "device ID : 0x%x\n", id);

 	/* Set ADC debounce time */
 	max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);

 	/*
 	 * Detect accessory after completing the initialization of platform
 	 *
 	 * - Use delayed workqueue to detect cable state and then
 	 * notify cable state to notifiee/platform through uevent.
 	 * After completing the booting of platform, the extcon provider
 	 * driver should notify cable state to upper layer.
 	 */
 	INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
 	ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 			delay_jiffies);
 	if (ret < 0) {
 		dev_err(&pdev->dev,
 			"failed to schedule delayed work for cable detect\n");
 		goto err_extcon;
 	}

 	return ret;

 err_extcon:
 	extcon_dev_unregister(info->edev);
 	return ret;
 }

 static int max14577_muic_remove(struct platform_device *pdev)
 {
 	struct max14577_muic_info *info = platform_get_drvdata(pdev);

 	cancel_work_sync(&info->irq_work);
 	extcon_dev_unregister(info->edev);

 	return 0;
 }

 static struct platform_driver max14577_muic_driver = {
 	.driver		= {
 		.name	= DEV_NAME,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= max14577_muic_probe,
 	.remove		= max14577_muic_remove,
 };

 module_platform_driver(max14577_muic_driver);

 MODULE_DESCRIPTION("MAXIM 14577 Extcon driver");
 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:extcon-max14577");
	/*
	* extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC
	*
	* Copyright (C) 2013 Samsung Electrnoics
	* Chanwoo Choi <cw00.choi@samsung.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/max14577.h>
	#include <linux/mfd/max14577-private.h>
	#include <linux/extcon.h>

	#define DEV_NAME "max14577-muic"
	#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */

	enum max14577_muic_adc_debounce_time {
	ADC_DEBOUNCE_TIME_5MS = 0,
	ADC_DEBOUNCE_TIME_10MS,
	ADC_DEBOUNCE_TIME_25MS,
	ADC_DEBOUNCE_TIME_38_62MS,
	};

	enum max14577_muic_status {
	MAX14577_MUIC_STATUS1 = 0,
	MAX14577_MUIC_STATUS2 = 1,
	MAX14577_MUIC_STATUS_END,
	};

	struct max14577_muic_info {
	struct device *dev;
	struct max14577 *max14577;
	struct extcon_dev *edev;
	int prev_cable_type;
	int prev_chg_type;
	u8 status[MAX14577_MUIC_STATUS_END];

	bool irq_adc;
	bool irq_chg;
	struct work_struct irq_work;
	struct mutex mutex;

	/*
	* Use delayed workqueue to detect cable state and then
	* notify cable state to notifiee/platform through uevent.
	* After completing the booting of platform, the extcon provider
	* driver should notify cable state to upper layer.
	*/
	struct delayed_work wq_detcable;

	/*
	* Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
	* h/w path of COMP2/COMN1 on CONTROL1 register.
	*/
	int path_usb;
	int path_uart;
	};

	enum max14577_muic_cable_group {
	MAX14577_CABLE_GROUP_ADC = 0,
	MAX14577_CABLE_GROUP_CHG,
	};

	/**
	* struct max14577_muic_irq
	* @irq: the index of irq list of MUIC device.
	* @name: the name of irq.
	* @virq: the virtual irq to use irq domain
	*/
	struct max14577_muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
	};

	static struct max14577_muic_irq muic_irqs[] = {
	{ MAX14577_IRQ_INT1_ADC, "muic-ADC" },
	{ MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
	{ MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
	{ MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
	{ MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
	{ MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
	{ MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
	{ MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
	};

	/* Define supported accessory type */
	enum max14577_muic_acc_type {
	MAX14577_MUIC_ADC_GROUND = 0x0,
	MAX14577_MUIC_ADC_SEND_END_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
	MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
	MAX14577_MUIC_ADC_RESERVED_ACC_1,
	MAX14577_MUIC_ADC_RESERVED_ACC_2,
	MAX14577_MUIC_ADC_RESERVED_ACC_3,
	MAX14577_MUIC_ADC_RESERVED_ACC_4,
	MAX14577_MUIC_ADC_RESERVED_ACC_5,
	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
	MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
	MAX14577_MUIC_ADC_TTY_CONVERTER,
	MAX14577_MUIC_ADC_UART_CABLE,
	MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
	MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
	MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
	MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
	MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
	MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
	MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
	MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
	MAX14577_MUIC_ADC_OPEN,
	};

	/* max14577 MUIC device support below list of accessories(external connector) */
	enum {
	EXTCON_CABLE_USB = 0,
	EXTCON_CABLE_TA,
	EXTCON_CABLE_FAST_CHARGER,
	EXTCON_CABLE_SLOW_CHARGER,
	EXTCON_CABLE_CHARGE_DOWNSTREAM,
	EXTCON_CABLE_JIG_USB_ON,
	EXTCON_CABLE_JIG_USB_OFF,
	EXTCON_CABLE_JIG_UART_OFF,
	EXTCON_CABLE_JIG_UART_ON,

	_EXTCON_CABLE_NUM,
	};

	static const char *max14577_extcon_cable[] = {
	[EXTCON_CABLE_USB] = "USB",
	[EXTCON_CABLE_TA] = "TA",
	[EXTCON_CABLE_FAST_CHARGER] = "Fast-charger",
	[EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger",
	[EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream",
	[EXTCON_CABLE_JIG_USB_ON] = "JIG-USB-ON",
	[EXTCON_CABLE_JIG_USB_OFF] = "JIG-USB-OFF",
	[EXTCON_CABLE_JIG_UART_OFF] = "JIG-UART-OFF",
	[EXTCON_CABLE_JIG_UART_ON] = "JIG-UART-ON",

	NULL,
	};

	/*
	* max14577_muic_set_debounce_time - Set the debounce time of ADC
	* @info: the instance including private data of max14577 MUIC
	* @time: the debounce time of ADC
	*/
	static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
	enum max14577_muic_adc_debounce_time time)
	{
	u8 ret;

	switch (time) {
	case ADC_DEBOUNCE_TIME_5MS:
	case ADC_DEBOUNCE_TIME_10MS:
	case ADC_DEBOUNCE_TIME_25MS:
	case ADC_DEBOUNCE_TIME_38_62MS:
	ret = max14577_update_reg(info->max14577->regmap,
	MAX14577_MUIC_REG_CONTROL3,
	CTRL3_ADCDBSET_MASK,
	time << CTRL3_ADCDBSET_SHIFT);
	if (ret) {
	dev_err(info->dev, "failed to set ADC debounce time\n");
	return ret;
	}
	break;
	default:
	dev_err(info->dev, "invalid ADC debounce time\n");
	return -EINVAL;
	}

	return 0;
	};

	/*
	* max14577_muic_set_path - Set hardware line according to attached cable
	* @info: the instance including private data of max14577 MUIC
	* @value: the path according to attached cable
	* @attached: the state of cable (true:attached, false:detached)
	*
	* The max14577 MUIC device share outside H/W line among a varity of cables
	* so, this function set internal path of H/W line according to the type of
	* attached cable.
	*/
	static int max14577_muic_set_path(struct max14577_muic_info *info,
	u8 val, bool attached)
	{
	int ret = 0;
	u8 ctrl1, ctrl2 = 0;

	/* Set open state to path before changing hw path */
	ret = max14577_update_reg(info->max14577->regmap,
	MAX14577_MUIC_REG_CONTROL1,
	CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
	if (ret < 0) {
	dev_err(info->dev, "failed to update MUIC register\n");
	return ret;
	}

	if (attached)
	ctrl1 = val;
	else
	ctrl1 = CTRL1_SW_OPEN;

	ret = max14577_update_reg(info->max14577->regmap,
	MAX14577_MUIC_REG_CONTROL1,
	CLEAR_IDBEN_MICEN_MASK, ctrl1);
	if (ret < 0) {
	dev_err(info->dev, "failed to update MUIC register\n");
	return ret;
	}

	if (attached)
	ctrl2 \|= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
	else
	ctrl2 \|= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */

	ret = max14577_update_reg(info->max14577->regmap,
	MAX14577_REG_CONTROL2,
	CTRL2_LOWPWR_MASK \| CTRL2_CPEN_MASK, ctrl2);
	if (ret < 0) {
	dev_err(info->dev, "failed to update MUIC register\n");
	return ret;
	}

	dev_dbg(info->dev,
	"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
	ctrl1, ctrl2, attached ? "attached" : "detached");

	return 0;
	}

	/*
	* max14577_muic_get_cable_type - Return cable type and check cable state
	* @info: the instance including private data of max14577 MUIC
	* @group: the path according to attached cable
	* @attached: store cable state and return
	*
	* This function check the cable state either attached or detached,
	* and then divide precise type of cable according to cable group.
	* - max14577_CABLE_GROUP_ADC
	* - max14577_CABLE_GROUP_CHG
	*/
	static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
	enum max14577_muic_cable_group group, bool *attached)
	{
	int cable_type = 0;
	int adc;
	int chg_type;

	switch (group) {
	case MAX14577_CABLE_GROUP_ADC:
	/*
	* Read ADC value to check cable type and decide cable state
	* according to cable type
	*/
	adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
	adc >>= STATUS1_ADC_SHIFT;

	/*
	* Check current cable state/cable type and store cable type
	* (info->prev_cable_type) for handling cable when cable is
	* detached.
	*/
	if (adc == MAX14577_MUIC_ADC_OPEN) {
	*attached = false;

	cable_type = info->prev_cable_type;
	info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
	} else {
	*attached = true;

	cable_type = info->prev_cable_type = adc;
	}
	break;
	case MAX14577_CABLE_GROUP_CHG:
	/*
	* Read charger type to check cable type and decide cable state
	* according to type of charger cable.
	*/
	chg_type = info->status[MAX14577_MUIC_STATUS2] &
	STATUS2_CHGTYP_MASK;
	chg_type >>= STATUS2_CHGTYP_SHIFT;

	if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
	*attached = false;

	cable_type = info->prev_chg_type;
	info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
	} else {
	*attached = true;

	/*
	* Check current cable state/cable type and store cable
	* type(info->prev_chg_type) for handling cable when
	* charger cable is detached.
	*/
	cable_type = info->prev_chg_type = chg_type;
	}

	break;
	default:
	dev_err(info->dev, "Unknown cable group (%d)\n", group);
	cable_type = -EINVAL;
	break;
	}

	return cable_type;
	}

	static int max14577_muic_jig_handler(struct max14577_muic_info *info,
	int cable_type, bool attached)
	{
	char cable_name[32];
	int ret = 0;
	u8 path = CTRL1_SW_OPEN;

	dev_dbg(info->dev,
	"external connector is %s (adc:0x%02x)\n",
	attached ? "attached" : "detached", cable_type);

	switch (cable_type) {
	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */
	/* PATH:AP_USB */
	strcpy(cable_name, "JIG-USB-OFF");
	path = CTRL1_SW_USB;
	break;
	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */
	/* PATH:AP_USB */
	strcpy(cable_name, "JIG-USB-ON");
	path = CTRL1_SW_USB;
	break;
	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */
	/* PATH:AP_UART */
	strcpy(cable_name, "JIG-UART-OFF");
	path = CTRL1_SW_UART;
	break;
	default:
	dev_err(info->dev, "failed to detect %s jig cable\n",
	attached ? "attached" : "detached");
	return -EINVAL;
	}

	ret = max14577_muic_set_path(info, path, attached);
	if (ret < 0)
	return ret;

	extcon_set_cable_state(info->edev, cable_name, attached);

	return 0;
	}

	static int max14577_muic_adc_handler(struct max14577_muic_info *info)
	{
	int cable_type;
	bool attached;
	int ret = 0;

	/* Check accessory state which is either detached or attached */
	cable_type = max14577_muic_get_cable_type(info,
	MAX14577_CABLE_GROUP_ADC, &attached);

	dev_dbg(info->dev,
	"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
	attached ? "attached" : "detached", cable_type,
	info->prev_cable_type);

	switch (cable_type) {
	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
	case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
	/* JIG */
	ret = max14577_muic_jig_handler(info, cable_type, attached);
	if (ret < 0)
	return ret;
	break;
	case MAX14577_MUIC_ADC_GROUND:
	case MAX14577_MUIC_ADC_SEND_END_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
	case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
	case MAX14577_MUIC_ADC_RESERVED_ACC_1:
	case MAX14577_MUIC_ADC_RESERVED_ACC_2:
	case MAX14577_MUIC_ADC_RESERVED_ACC_3:
	case MAX14577_MUIC_ADC_RESERVED_ACC_4:
	case MAX14577_MUIC_ADC_RESERVED_ACC_5:
	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
	case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
	case MAX14577_MUIC_ADC_TTY_CONVERTER:
	case MAX14577_MUIC_ADC_UART_CABLE:
	case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
	case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
	case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
	case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
	case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
	/*
	* This accessory isn't used in general case if it is specially
	* needed to detect additional accessory, should implement
	* proper operation when this accessory is attached/detached.
	*/
	dev_info(info->dev,
	"accessory is %s but it isn't used (adc:0x%x)\n",
	attached ? "attached" : "detached", cable_type);
	return -EAGAIN;
	default:
	dev_err(info->dev,
	"failed to detect %s accessory (adc:0x%x)\n",
	attached ? "attached" : "detached", cable_type);
	return -EINVAL;
	}

	return 0;
	}

	static int max14577_muic_chg_handler(struct max14577_muic_info *info)
	{
	int chg_type;
	bool attached;
	int ret = 0;

	chg_type = max14577_muic_get_cable_type(info,
	MAX14577_CABLE_GROUP_CHG, &attached);

	dev_dbg(info->dev,
	"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
	attached ? "attached" : "detached",
	chg_type, info->prev_chg_type);

	switch (chg_type) {
	case MAX14577_CHARGER_TYPE_USB:
	/* PATH:AP_USB */
	ret = max14577_muic_set_path(info, info->path_usb, attached);
	if (ret < 0)
	return ret;

	extcon_set_cable_state(info->edev, "USB", attached);
	break;
	case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
	extcon_set_cable_state(info->edev, "TA", attached);
	break;
	case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
	extcon_set_cable_state(info->edev,
	"Charge-downstream", attached);
	break;
	case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
	extcon_set_cable_state(info->edev, "Slow-charger", attached);
	break;
	case MAX14577_CHARGER_TYPE_SPECIAL_1A:
	extcon_set_cable_state(info->edev, "Fast-charger", attached);
	break;
	case MAX14577_CHARGER_TYPE_NONE:
	case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
	break;
	default:
	dev_err(info->dev,
	"failed to detect %s accessory (chg_type:0x%x)\n",
	attached ? "attached" : "detached", chg_type);
	return -EINVAL;
	}

	return 0;
	}

	static void max14577_muic_irq_work(struct work_struct *work)
	{
	struct max14577_muic_info *info = container_of(work,
	struct max14577_muic_info, irq_work);
	int ret = 0;

	if (!info->edev)
	return;

	mutex_lock(&info->mutex);

	ret = max14577_bulk_read(info->max14577->regmap,
	MAX14577_MUIC_REG_STATUS1, info->status, 2);
	if (ret) {
	dev_err(info->dev, "failed to read MUIC register\n");
	mutex_unlock(&info->mutex);
	return;
	}

	if (info->irq_adc) {
	ret = max14577_muic_adc_handler(info);
	info->irq_adc = false;
	}
	if (info->irq_chg) {
	ret = max14577_muic_chg_handler(info);
	info->irq_chg = false;
	}

	if (ret < 0)
	dev_err(info->dev, "failed to handle MUIC interrupt\n");

	mutex_unlock(&info->mutex);

	return;
	}

	static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
	{
	struct max14577_muic_info *info = data;
	int i, irq_type = -1;

	/*
	* We may be called multiple times for different nested IRQ-s.
	* Including changes in INT1_ADC and INT2_CGHTYP at once.
	* However we only need to know whether it was ADC, charger
	* or both interrupts so decode IRQ and turn on proper flags.
	*/
	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
	if (irq == muic_irqs[i].virq)
	irq_type = muic_irqs[i].irq;

	switch (irq_type) {
	case MAX14577_IRQ_INT1_ADC:
	case MAX14577_IRQ_INT1_ADCLOW:
	case MAX14577_IRQ_INT1_ADCERR:
	/* Handle all of accessory except for
	type of charger accessory */
	info->irq_adc = true;
	break;
	case MAX14577_IRQ_INT2_CHGTYP:
	case MAX14577_IRQ_INT2_CHGDETRUN:
	case MAX14577_IRQ_INT2_DCDTMR:
	case MAX14577_IRQ_INT2_DBCHG:
	case MAX14577_IRQ_INT2_VBVOLT:
	/* Handle charger accessory */
	info->irq_chg = true;
	break;
	default:
	dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
	irq_type);
	return IRQ_HANDLED;
	}
	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
	}

	static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
	{
	int ret = 0;
	int adc;
	int chg_type;
	bool attached;

	mutex_lock(&info->mutex);

	/* Read STATUSx register to detect accessory */
	ret = max14577_bulk_read(info->max14577->regmap,
	MAX14577_MUIC_REG_STATUS1, info->status, 2);
	if (ret) {
	dev_err(info->dev, "failed to read MUIC register\n");
	mutex_unlock(&info->mutex);
	return ret;
	}

	adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
	&attached);
	if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
	ret = max14577_muic_adc_handler(info);
	if (ret < 0) {
	dev_err(info->dev, "Cannot detect accessory\n");
	mutex_unlock(&info->mutex);
	return ret;
	}
	}

	chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
	&attached);
	if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
	ret = max14577_muic_chg_handler(info);
	if (ret < 0) {
	dev_err(info->dev, "Cannot detect charger accessory\n");
	mutex_unlock(&info->mutex);
	return ret;
	}
	}

	mutex_unlock(&info->mutex);

	return 0;
	}

	static void max14577_muic_detect_cable_wq(struct work_struct *work)
	{
	struct max14577_muic_info *info = container_of(to_delayed_work(work),
	struct max14577_muic_info, wq_detcable);

	max14577_muic_detect_accessory(info);
	}

	static int max14577_muic_probe(struct platform_device *pdev)
	{
	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	struct max14577_muic_info *info;
	int delay_jiffies;
	int ret;
	int i;
	u8 id;

	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	if (!info) {
	dev_err(&pdev->dev, "failed to allocate memory\n");
	return -ENOMEM;
	}
	info->dev = &pdev->dev;
	info->max14577 = max14577;

	platform_set_drvdata(pdev, info);
	mutex_init(&info->mutex);

	INIT_WORK(&info->irq_work, max14577_muic_irq_work);

	/* Support irq domain for max14577 MUIC device */
	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
	struct max14577_muic_irq *muic_irq = &muic_irqs[i];
	unsigned int virq = 0;

	virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
	if (!virq)
	return -EINVAL;
	muic_irq->virq = virq;

	ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
	max14577_muic_irq_handler,
	IRQF_NO_SUSPEND,
	muic_irq->name, info);
	if (ret) {
	dev_err(&pdev->dev,
	"failed: irq request (IRQ: %d,"
	" error :%d)\n",
	muic_irq->irq, ret);
	return ret;
	}
	}

	/* Initialize extcon device */
	info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL);
	if (!info->edev) {
	dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
	return -ENOMEM;
	}
	info->edev->name = DEV_NAME;
	info->edev->supported_cable = max14577_extcon_cable;
	ret = extcon_dev_register(info->edev);
	if (ret) {
	dev_err(&pdev->dev, "failed to register extcon device\n");
	return ret;
	}

	/* Default h/w line path */
	info->path_usb = CTRL1_SW_USB;
	info->path_uart = CTRL1_SW_UART;
	delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);

	/* Set initial path for UART */
	max14577_muic_set_path(info, info->path_uart, true);

	/* Check revision number of MUIC device*/
	ret = max14577_read_reg(info->max14577->regmap,
	MAX14577_REG_DEVICEID, &id);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to read revision number\n");
	goto err_extcon;
	}
	dev_info(info->dev, "device ID : 0x%x\n", id);

	/* Set ADC debounce time */
	max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);

	/*
	* Detect accessory after completing the initialization of platform
	*
	* - Use delayed workqueue to detect cable state and then
	* notify cable state to notifiee/platform through uevent.
	* After completing the booting of platform, the extcon provider
	* driver should notify cable state to upper layer.
	*/
	INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
	ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
	delay_jiffies);
	if (ret < 0) {
	dev_err(&pdev->dev,
	"failed to schedule delayed work for cable detect\n");
	goto err_extcon;
	}

	return ret;

	err_extcon:
	extcon_dev_unregister(info->edev);
	return ret;
	}

	static int max14577_muic_remove(struct platform_device *pdev)
	{
	struct max14577_muic_info *info = platform_get_drvdata(pdev);

	cancel_work_sync(&info->irq_work);
	extcon_dev_unregister(info->edev);

	return 0;
	}

	static struct platform_driver max14577_muic_driver = {
	.driver = {
	.name = DEV_NAME,
	.owner = THIS_MODULE,
	},
	.probe = max14577_muic_probe,
	.remove = max14577_muic_remove,
	};

	module_platform_driver(max14577_muic_driver);

	MODULE_DESCRIPTION("MAXIM 14577 Extcon driver");
	MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:extcon-max14577");