Initial import

1 files changed, 801 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c
new file mode 100644
index 000000000..5774e56c6
--- /dev/null
+++ b/drivers/extcon/extcon-max8997.c
@@ -0,0 +1,801 @@
+/*
+ * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
+ *
+ *  Copyright (C) 2012 Samsung Electronics
+ *  Donggeun Kim <dg77.kim@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/slab.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/kobject.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+#include <linux/extcon.h>
+#include <linux/irqdomain.h>
+
+#define	DEV_NAME			"max8997-muic"
+#define	DELAY_MS_DEFAULT		20000		/* unit: millisecond */
+
+enum max8997_muic_adc_debounce_time {
+	ADC_DEBOUNCE_TIME_0_5MS = 0,	/* 0.5ms */
+	ADC_DEBOUNCE_TIME_10MS,		/* 10ms */
+	ADC_DEBOUNCE_TIME_25MS,		/* 25ms */
+	ADC_DEBOUNCE_TIME_38_62MS,	/* 38.62ms */
+};
+
+struct max8997_muic_irq {
+	unsigned int irq;
+	const char *name;
+	unsigned int virq;
+};
+
+static struct max8997_muic_irq muic_irqs[] = {
+	{ MAX8997_MUICIRQ_ADCError,	"muic-ADCERROR" },
+	{ MAX8997_MUICIRQ_ADCLow,	"muic-ADCLOW" },
+	{ MAX8997_MUICIRQ_ADC,		"muic-ADC" },
+	{ MAX8997_MUICIRQ_VBVolt,	"muic-VBVOLT" },
+	{ MAX8997_MUICIRQ_DBChg,	"muic-DBCHG" },
+	{ MAX8997_MUICIRQ_DCDTmr,	"muic-DCDTMR" },
+	{ MAX8997_MUICIRQ_ChgDetRun,	"muic-CHGDETRUN" },
+	{ MAX8997_MUICIRQ_ChgTyp,	"muic-CHGTYP" },
+	{ MAX8997_MUICIRQ_OVP,		"muic-OVP" },
+};
+
+/* Define supported cable type */
+enum max8997_muic_acc_type {
+	MAX8997_MUIC_ADC_GROUND = 0x0,
+	MAX8997_MUIC_ADC_MHL,			/* MHL*/
+	MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
+	MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
+	MAX8997_MUIC_ADC_RESERVED_ACC_1,
+	MAX8997_MUIC_ADC_RESERVED_ACC_2,
+	MAX8997_MUIC_ADC_RESERVED_ACC_3,
+	MAX8997_MUIC_ADC_RESERVED_ACC_4,
+	MAX8997_MUIC_ADC_RESERVED_ACC_5,
+	MAX8997_MUIC_ADC_CEA936_AUDIO,
+	MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
+	MAX8997_MUIC_ADC_TTY_CONVERTER,
+	MAX8997_MUIC_ADC_UART_CABLE,
+	MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
+	MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,	/* JIG-USB-OFF */
+	MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,	/* JIG-USB-ON */
+	MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,	/* DESKDOCK */
+	MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
+	MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF,	/* JIG-UART */
+	MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,	/* CARDOCK */
+	MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
+	MAX8997_MUIC_ADC_OPEN,			/* OPEN */
+};
+
+enum max8997_muic_cable_group {
+	MAX8997_CABLE_GROUP_ADC = 0,
+	MAX8997_CABLE_GROUP_ADC_GND,
+	MAX8997_CABLE_GROUP_CHG,
+	MAX8997_CABLE_GROUP_VBVOLT,
+};
+
+enum max8997_muic_usb_type {
+	MAX8997_USB_HOST,
+	MAX8997_USB_DEVICE,
+};
+
+enum max8997_muic_charger_type {
+	MAX8997_CHARGER_TYPE_NONE = 0,
+	MAX8997_CHARGER_TYPE_USB,
+	MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
+	MAX8997_CHARGER_TYPE_DEDICATED_CHG,
+	MAX8997_CHARGER_TYPE_500MA,
+	MAX8997_CHARGER_TYPE_1A,
+	MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
+};
+
+struct max8997_muic_info {
+	struct device *dev;
+	struct i2c_client *muic;
+	struct extcon_dev *edev;
+	int prev_cable_type;
+	int prev_chg_type;
+	u8 status[2];
+
+	int irq;
+	struct work_struct irq_work;
+	struct mutex mutex;
+
+	struct max8997_muic_platform_data *muic_pdata;
+	enum max8997_muic_charger_type pre_charger_type;
+
+	/*
+	 * 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 {
+	EXTCON_CABLE_USB = 0,
+	EXTCON_CABLE_USB_HOST,
+	EXTCON_CABLE_TA,
+	EXTCON_CABLE_FAST_CHARGER,
+	EXTCON_CABLE_SLOW_CHARGER,
+	EXTCON_CABLE_CHARGE_DOWNSTREAM,
+	EXTCON_CABLE_MHL,
+	EXTCON_CABLE_DOCK_DESK,
+	EXTCON_CABLE_DOCK_CARD,
+	EXTCON_CABLE_JIG,
+
+	_EXTCON_CABLE_NUM,
+};
+
+static const char *max8997_extcon_cable[] = {
+	[EXTCON_CABLE_USB]			= "USB",
+	[EXTCON_CABLE_USB_HOST]			= "USB-Host",
+	[EXTCON_CABLE_TA]			= "TA",
+	[EXTCON_CABLE_FAST_CHARGER]		= "Fast-charger",
+	[EXTCON_CABLE_SLOW_CHARGER]		= "Slow-charger",
+	[EXTCON_CABLE_CHARGE_DOWNSTREAM]	= "Charge-downstream",
+	[EXTCON_CABLE_MHL]			= "MHL",
+	[EXTCON_CABLE_DOCK_DESK]		= "Dock-Desk",
+	[EXTCON_CABLE_DOCK_CARD]		= "Dock-Card",
+	[EXTCON_CABLE_JIG]			= "JIG",
+
+	NULL,
+};
+
+/*
+ * max8997_muic_set_debounce_time - Set the debounce time of ADC
+ * @info: the instance including private data of max8997 MUIC
+ * @time: the debounce time of ADC
+ */
+static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
+		enum max8997_muic_adc_debounce_time time)
+{
+	int ret;
+
+	switch (time) {
+	case ADC_DEBOUNCE_TIME_0_5MS:
+	case ADC_DEBOUNCE_TIME_10MS:
+	case ADC_DEBOUNCE_TIME_25MS:
+	case ADC_DEBOUNCE_TIME_38_62MS:
+		ret = max8997_update_reg(info->muic,
+					  MAX8997_MUIC_REG_CONTROL3,
+					  time << CONTROL3_ADCDBSET_SHIFT,
+					  CONTROL3_ADCDBSET_MASK);
+		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;
+};
+
+/*
+ * max8997_muic_set_path - Set hardware line according to attached cable
+ * @info: the instance including private data of max8997 MUIC
+ * @value: the path according to attached cable
+ * @attached: the state of cable (true:attached, false:detached)
+ *
+ * The max8997 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 max8997_muic_set_path(struct max8997_muic_info *info,
+		u8 val, bool attached)
+{
+	int ret = 0;
+	u8 ctrl1, ctrl2 = 0;
+
+	if (attached)
+		ctrl1 = val;
+	else
+		ctrl1 = CONTROL1_SW_OPEN;
+
+	ret = max8997_update_reg(info->muic,
+			MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
+	if (ret < 0) {
+		dev_err(info->dev, "failed to update MUIC register\n");
+		return ret;
+	}
+
+	if (attached)
+		ctrl2 |= CONTROL2_CPEN_MASK;	/* LowPwr=0, CPEn=1 */
+	else
+		ctrl2 |= CONTROL2_LOWPWR_MASK;	/* LowPwr=1, CPEn=0 */
+
+	ret = max8997_update_reg(info->muic,
+			MAX8997_MUIC_REG_CONTROL2, ctrl2,
+			CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
+	if (ret < 0) {
+		dev_err(info->dev, "failed to update MUIC register\n");
+		return ret;
+	}
+
+	dev_info(info->dev,
+		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
+		ctrl1, ctrl2, attached ? "attached" : "detached");
+
+	return 0;
+}
+
+/*
+ * max8997_muic_get_cable_type - Return cable type and check cable state
+ * @info: the instance including private data of max8997 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.
+ *	- MAX8997_CABLE_GROUP_ADC
+ *	- MAX8997_CABLE_GROUP_CHG
+ */
+static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
+		enum max8997_muic_cable_group group, bool *attached)
+{
+	int cable_type = 0;
+	int adc;
+	int chg_type;
+
+	switch (group) {
+	case MAX8997_CABLE_GROUP_ADC:
+		/*
+		 * Read ADC value to check cable type and decide cable state
+		 * according to cable type
+		 */
+		adc = info->status[0] & 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 == MAX8997_MUIC_ADC_OPEN) {
+			*attached = false;
+
+			cable_type = info->prev_cable_type;
+			info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
+		} else {
+			*attached = true;
+
+			cable_type = info->prev_cable_type = adc;
+		}
+		break;
+	case MAX8997_CABLE_GROUP_CHG:
+		/*
+		 * Read charger type to check cable type and decide cable state
+		 * according to type of charger cable.
+		 */
+		chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
+		chg_type >>= STATUS2_CHGTYP_SHIFT;
+
+		if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
+			*attached = false;
+
+			cable_type = info->prev_chg_type;
+			info->prev_chg_type = MAX8997_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 max8997_muic_handle_usb(struct max8997_muic_info *info,
+			enum max8997_muic_usb_type usb_type, bool attached)
+{
+	int ret = 0;
+
+	if (usb_type == MAX8997_USB_HOST) {
+		ret = max8997_muic_set_path(info, info->path_usb, attached);
+		if (ret < 0) {
+			dev_err(info->dev, "failed to update muic register\n");
+			return ret;
+		}
+	}
+
+	switch (usb_type) {
+	case MAX8997_USB_HOST:
+		extcon_set_cable_state(info->edev, "USB-Host", attached);
+		break;
+	case MAX8997_USB_DEVICE:
+		extcon_set_cable_state(info->edev, "USB", attached);
+		break;
+	default:
+		dev_err(info->dev, "failed to detect %s usb cable\n",
+			attached ? "attached" : "detached");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max8997_muic_handle_dock(struct max8997_muic_info *info,
+			int cable_type, bool attached)
+{
+	int ret = 0;
+
+	ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
+	if (ret) {
+		dev_err(info->dev, "failed to update muic register\n");
+		return ret;
+	}
+
+	switch (cable_type) {
+	case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
+		extcon_set_cable_state(info->edev, "Dock-desk", attached);
+		break;
+	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
+		extcon_set_cable_state(info->edev, "Dock-card", attached);
+		break;
+	default:
+		dev_err(info->dev, "failed to detect %s dock device\n",
+			attached ? "attached" : "detached");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
+			bool attached)
+{
+	int ret = 0;
+
+	/* switch to UART */
+	ret = max8997_muic_set_path(info, info->path_uart, attached);
+	if (ret) {
+		dev_err(info->dev, "failed to update muic register\n");
+		return ret;
+	}
+
+	extcon_set_cable_state(info->edev, "JIG", attached);
+
+	return 0;
+}
+
+static int max8997_muic_adc_handler(struct max8997_muic_info *info)
+{
+	int cable_type;
+	bool attached;
+	int ret = 0;
+
+	/* Check cable state which is either detached or attached */
+	cable_type = max8997_muic_get_cable_type(info,
+				MAX8997_CABLE_GROUP_ADC, &attached);
+
+	switch (cable_type) {
+	case MAX8997_MUIC_ADC_GROUND:
+		ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX8997_MUIC_ADC_MHL:
+		extcon_set_cable_state(info->edev, "MHL", attached);
+		break;
+	case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
+	case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
+		ret = max8997_muic_handle_usb(info,
+					     MAX8997_USB_DEVICE, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
+	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
+		ret = max8997_muic_handle_dock(info, cable_type, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
+		ret = max8997_muic_handle_jig_uart(info, attached);
+		break;
+	case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
+	case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
+	case MAX8997_MUIC_ADC_RESERVED_ACC_1:
+	case MAX8997_MUIC_ADC_RESERVED_ACC_2:
+	case MAX8997_MUIC_ADC_RESERVED_ACC_3:
+	case MAX8997_MUIC_ADC_RESERVED_ACC_4:
+	case MAX8997_MUIC_ADC_RESERVED_ACC_5:
+	case MAX8997_MUIC_ADC_CEA936_AUDIO:
+	case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
+	case MAX8997_MUIC_ADC_TTY_CONVERTER:
+	case MAX8997_MUIC_ADC_UART_CABLE:
+	case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
+	case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
+	case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
+		/*
+		 * This cable isn't used in general case if it is specially
+		 * needed to detect additional cable, should implement
+		 * proper operation when this cable is attached/detached.
+		 */
+		dev_info(info->dev,
+			"cable is %s but it isn't used (type:0x%x)\n",
+			attached ? "attached" : "detached", cable_type);
+		return -EAGAIN;
+	default:
+		dev_err(info->dev,
+			"failed to detect %s unknown cable (type:0x%x)\n",
+			attached ? "attached" : "detached", cable_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max8997_muic_chg_handler(struct max8997_muic_info *info)
+{
+	int chg_type;
+	bool attached;
+	int adc;
+
+	chg_type = max8997_muic_get_cable_type(info,
+				MAX8997_CABLE_GROUP_CHG, &attached);
+
+	switch (chg_type) {
+	case MAX8997_CHARGER_TYPE_NONE:
+		break;
+	case MAX8997_CHARGER_TYPE_USB:
+		adc = info->status[0] & STATUS1_ADC_MASK;
+		adc >>= STATUS1_ADC_SHIFT;
+
+		if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
+			max8997_muic_handle_usb(info,
+					MAX8997_USB_DEVICE, attached);
+		}
+		break;
+	case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
+		extcon_set_cable_state(info->edev,
+				      "Charge-downstream", attached);
+		break;
+	case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
+		extcon_set_cable_state(info->edev, "TA", attached);
+		break;
+	case MAX8997_CHARGER_TYPE_500MA:
+		extcon_set_cable_state(info->edev, "Slow-charger", attached);
+		break;
+	case MAX8997_CHARGER_TYPE_1A:
+		extcon_set_cable_state(info->edev, "Fast-charger", attached);
+		break;
+	default:
+		dev_err(info->dev,
+			"failed to detect %s unknown chg cable (type:0x%x)\n",
+			attached ? "attached" : "detached", chg_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void max8997_muic_irq_work(struct work_struct *work)
+{
+	struct max8997_muic_info *info = container_of(work,
+			struct max8997_muic_info, irq_work);
+	int irq_type = 0;
+	int i, ret;
+
+	if (!info->edev)
+		return;
+
+	mutex_lock(&info->mutex);
+
+	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
+		if (info->irq == muic_irqs[i].virq)
+			irq_type = muic_irqs[i].irq;
+
+	ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
+				2, info->status);
+	if (ret) {
+		dev_err(info->dev, "failed to read muic register\n");
+		mutex_unlock(&info->mutex);
+		return;
+	}
+
+	switch (irq_type) {
+	case MAX8997_MUICIRQ_ADCError:
+	case MAX8997_MUICIRQ_ADCLow:
+	case MAX8997_MUICIRQ_ADC:
+		/* Handle all of cable except for charger cable */
+		ret = max8997_muic_adc_handler(info);
+		break;
+	case MAX8997_MUICIRQ_VBVolt:
+	case MAX8997_MUICIRQ_DBChg:
+	case MAX8997_MUICIRQ_DCDTmr:
+	case MAX8997_MUICIRQ_ChgDetRun:
+	case MAX8997_MUICIRQ_ChgTyp:
+		/* Handle charger cable */
+		ret = max8997_muic_chg_handler(info);
+		break;
+	case MAX8997_MUICIRQ_OVP:
+		break;
+	default:
+		dev_info(info->dev, "misc interrupt: irq %d occurred\n",
+				irq_type);
+		mutex_unlock(&info->mutex);
+		return;
+	}
+
+	if (ret < 0)
+		dev_err(info->dev, "failed to handle MUIC interrupt\n");
+
+	mutex_unlock(&info->mutex);
+}
+
+static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
+{
+	struct max8997_muic_info *info = data;
+
+	dev_dbg(info->dev, "irq:%d\n", irq);
+	info->irq = irq;
+
+	schedule_work(&info->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static int max8997_muic_detect_dev(struct max8997_muic_info *info)
+{
+	int ret = 0;
+	int adc;
+	int chg_type;
+	bool attached;
+
+	mutex_lock(&info->mutex);
+
+	/* Read STATUSx register to detect accessory */
+	ret = max8997_bulk_read(info->muic,
+			MAX8997_MUIC_REG_STATUS1, 2, info->status);
+	if (ret) {
+		dev_err(info->dev, "failed to read MUIC register\n");
+		mutex_unlock(&info->mutex);
+		return ret;
+	}
+
+	adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
+					&attached);
+	if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
+		ret = max8997_muic_adc_handler(info);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot detect ADC cable\n");
+			mutex_unlock(&info->mutex);
+			return ret;
+		}
+	}
+
+	chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
+					&attached);
+	if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
+		ret = max8997_muic_chg_handler(info);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot detect charger cable\n");
+			mutex_unlock(&info->mutex);
+			return ret;
+		}
+	}
+
+	mutex_unlock(&info->mutex);
+
+	return 0;
+}
+
+static void max8997_muic_detect_cable_wq(struct work_struct *work)
+{
+	struct max8997_muic_info *info = container_of(to_delayed_work(work),
+				struct max8997_muic_info, wq_detcable);
+	int ret;
+
+	ret = max8997_muic_detect_dev(info);
+	if (ret < 0)
+		dev_err(info->dev, "failed to detect cable type\n");
+}
+
+static int max8997_muic_probe(struct platform_device *pdev)
+{
+	struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
+	struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
+	struct max8997_muic_info *info;
+	int delay_jiffies;
+	int ret, i;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+	info->muic = max8997->muic;
+
+	platform_set_drvdata(pdev, info);
+	mutex_init(&info->mutex);
+
+	INIT_WORK(&info->irq_work, max8997_muic_irq_work);
+
+	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
+		struct max8997_muic_irq *muic_irq = &muic_irqs[i];
+		unsigned int virq = 0;
+
+		virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
+		if (!virq) {
+			ret = -EINVAL;
+			goto err_irq;
+		}
+		muic_irq->virq = virq;
+
+		ret = request_threaded_irq(virq, NULL,
+				max8997_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);
+			goto err_irq;
+		}
+	}
+
+	/* External connector */
+	info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
+	if (IS_ERR(info->edev)) {
+		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
+		ret = -ENOMEM;
+		goto err_irq;
+	}
+	info->edev->name = DEV_NAME;
+
+	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register extcon device\n");
+		goto err_irq;
+	}
+
+	if (pdata && pdata->muic_pdata) {
+		struct max8997_muic_platform_data *muic_pdata
+			= pdata->muic_pdata;
+
+		/* Initialize registers according to platform data */
+		for (i = 0; i < muic_pdata->num_init_data; i++) {
+			max8997_write_reg(info->muic,
+					muic_pdata->init_data[i].addr,
+					muic_pdata->init_data[i].data);
+		}
+
+		/*
+		 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
+		 * h/w path of COMP2/COMN1 on CONTROL1 register.
+		 */
+		if (muic_pdata->path_uart)
+			info->path_uart = muic_pdata->path_uart;
+		else
+			info->path_uart = CONTROL1_SW_UART;
+
+		if (muic_pdata->path_usb)
+			info->path_usb = muic_pdata->path_usb;
+		else
+			info->path_usb = CONTROL1_SW_USB;
+
+		/*
+		 * Default delay time for detecting cable state
+		 * after certain time.
+		 */
+		if (muic_pdata->detcable_delay_ms)
+			delay_jiffies =
+				msecs_to_jiffies(muic_pdata->detcable_delay_ms);
+		else
+			delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
+	} else {
+		info->path_uart = CONTROL1_SW_UART;
+		info->path_usb = CONTROL1_SW_USB;
+		delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
+	}
+
+	/* Set initial path for UART */
+	 max8997_muic_set_path(info, info->path_uart, true);
+
+	/* Set ADC debounce time */
+	max8997_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, max8997_muic_detect_cable_wq);
+	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+			delay_jiffies);
+
+	return 0;
+
+err_irq:
+	while (--i >= 0)
+		free_irq(muic_irqs[i].virq, info);
+	return ret;
+}
+
+static int max8997_muic_remove(struct platform_device *pdev)
+{
+	struct max8997_muic_info *info = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
+		free_irq(muic_irqs[i].virq, info);
+	cancel_work_sync(&info->irq_work);
+
+	return 0;
+}
+
+static struct platform_driver max8997_muic_driver = {
+	.driver		= {
+		.name	= DEV_NAME,
+	},
+	.probe		= max8997_muic_probe,
+	.remove		= max8997_muic_remove,
+};
+
+module_platform_driver(max8997_muic_driver);
+
+MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
+MODULE_LICENSE("GPL");