extcon: max77843: Add max77843 MUIC driver

This patch adds MAX77843 extcon driver to support for MUIC(Micro
USB Interface Controller) device by using EXTCON subsystem to handle
various external connectors.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

3 files changed, 892 insertions, 0 deletions

diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index e4c01ab..fdc0bf0 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -55,6 +55,16 @@ config EXTCON_MAX77693
 	  Maxim MAX77693 PMIC. The MAX77693 MUIC is a USB port accessory
 	  detector and switch.
 
+config EXTCON_MAX77843
+	tristate "MAX77843 EXTCON Support"
+	depends on MFD_MAX77843
+	select IRQ_DOMAIN
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the MUIC device of
+	  Maxim MAX77843. The MAX77843 MUIC is a USB port accessory
+	  detector add switch.
+
 config EXTCON_MAX8997
 	tristate "MAX8997 EXTCON Support"
 	depends on MFD_MAX8997 && IRQ_DOMAIN
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 6a08a98..e1eb2d5 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o
 obj-$(CONFIG_EXTCON_GPIO)	+= extcon-gpio.o
 obj-$(CONFIG_EXTCON_MAX14577)	+= extcon-max14577.o
 obj-$(CONFIG_EXTCON_MAX77693)	+= extcon-max77693.o
+obj-$(CONFIG_EXTCON_MAX77843)	+= extcon-max77843.o
 obj-$(CONFIG_EXTCON_MAX8997)	+= extcon-max8997.o
 obj-$(CONFIG_EXTCON_PALMAS)	+= extcon-palmas.o
 obj-$(CONFIG_EXTCON_RT8973A)	+= extcon-rt8973a.o
diff --git a/drivers/extcon/extcon-max77843.c b/drivers/extcon/extcon-max77843.c
new file mode 100644
index 0000000..598a017
--- /dev/null
+++ b/drivers/extcon/extcon-max77843.c
@@ -0,0 +1,881 @@
+/*
+ * extcon-max77843.c - Maxim MAX77843 extcon driver to support
+ *			MUIC(Micro USB Interface Controller)
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Author: Jaewon Kim <jaewon02.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.
+ */
+
+#include <linux/extcon.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/max77843-private.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#define DELAY_MS_DEFAULT		15000	/* unit: millisecond */
+
+enum max77843_muic_status {
+	MAX77843_MUIC_STATUS1 = 0,
+	MAX77843_MUIC_STATUS2,
+	MAX77843_MUIC_STATUS3,
+
+	MAX77843_MUIC_STATUS_NUM,
+};
+
+struct max77843_muic_info {
+	struct device *dev;
+	struct max77843 *max77843;
+	struct extcon_dev *edev;
+
+	struct mutex mutex;
+	struct work_struct irq_work;
+	struct delayed_work wq_detcable;
+
+	u8 status[MAX77843_MUIC_STATUS_NUM];
+	int prev_cable_type;
+	int prev_chg_type;
+	int prev_gnd_type;
+
+	bool irq_adc;
+	bool irq_chg;
+};
+
+enum max77843_muic_cable_group {
+	MAX77843_CABLE_GROUP_ADC = 0,
+	MAX77843_CABLE_GROUP_ADC_GND,
+	MAX77843_CABLE_GROUP_CHG,
+};
+
+enum max77843_muic_adc_debounce_time {
+	MAX77843_DEBOUNCE_TIME_5MS = 0,
+	MAX77843_DEBOUNCE_TIME_10MS,
+	MAX77843_DEBOUNCE_TIME_25MS,
+	MAX77843_DEBOUNCE_TIME_38_62MS,
+};
+
+/* Define accessory cable type */
+enum max77843_muic_accessory_type {
+	MAX77843_MUIC_ADC_GROUND = 0,
+	MAX77843_MUIC_ADC_SEND_END_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
+	MAX77843_MUIC_ADC_RESERVED_ACC_1,
+	MAX77843_MUIC_ADC_RESERVED_ACC_2,
+	MAX77843_MUIC_ADC_RESERVED_ACC_3,
+	MAX77843_MUIC_ADC_RESERVED_ACC_4,
+	MAX77843_MUIC_ADC_RESERVED_ACC_5,
+	MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
+	MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
+	MAX77843_MUIC_ADC_TTY_CONVERTER,
+	MAX77843_MUIC_ADC_UART_CABLE,
+	MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
+	MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
+	MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
+	MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
+	MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
+	MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
+	MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
+	MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
+	MAX77843_MUIC_ADC_OPEN,
+
+	/* The blow accessories should check
+	   not only ADC value but also ADC1K and VBVolt value. */
+						/* Offset|ADC1K|VBVolt| */
+	MAX77843_MUIC_GND_USB_HOST = 0x100,	/*    0x1|    0|     0| */
+	MAX77843_MUIC_GND_USB_HOST_VB = 0x101,	/*    0x1|    0|     1| */
+	MAX77843_MUIC_GND_MHL = 0x102,		/*    0x1|    1|     0| */
+	MAX77843_MUIC_GND_MHL_VB = 0x103,	/*    0x1|    1|     1| */
+};
+
+/* Define charger cable type */
+enum max77843_muic_charger_type {
+	MAX77843_MUIC_CHG_NONE = 0,
+	MAX77843_MUIC_CHG_USB,
+	MAX77843_MUIC_CHG_DOWNSTREAM,
+	MAX77843_MUIC_CHG_DEDICATED,
+	MAX77843_MUIC_CHG_SPECIAL_500MA,
+	MAX77843_MUIC_CHG_SPECIAL_1A,
+	MAX77843_MUIC_CHG_SPECIAL_BIAS,
+	MAX77843_MUIC_CHG_RESERVED,
+	MAX77843_MUIC_CHG_GND,
+};
+
+enum {
+	MAX77843_CABLE_USB = 0,
+	MAX77843_CABLE_USB_HOST,
+	MAX77843_CABLE_TA,
+	MAX77843_CABLE_CHARGE_DOWNSTREAM,
+	MAX77843_CABLE_FAST_CHARGER,
+	MAX77843_CABLE_SLOW_CHARGER,
+	MAX77843_CABLE_MHL,
+	MAX77843_CABLE_MHL_TA,
+	MAX77843_CABLE_JIG_USB_ON,
+	MAX77843_CABLE_JIG_USB_OFF,
+	MAX77843_CABLE_JIG_UART_ON,
+	MAX77843_CABLE_JIG_UART_OFF,
+
+	MAX77843_CABLE_NUM,
+};
+
+static const char *max77843_extcon_cable[] = {
+	[MAX77843_CABLE_USB]			= "USB",
+	[MAX77843_CABLE_USB_HOST]		= "USB-HOST",
+	[MAX77843_CABLE_TA]			= "TA",
+	[MAX77843_CABLE_CHARGE_DOWNSTREAM]	= "CHARGER-DOWNSTREAM",
+	[MAX77843_CABLE_FAST_CHARGER]		= "FAST-CHARGER",
+	[MAX77843_CABLE_SLOW_CHARGER]		= "SLOW-CHARGER",
+	[MAX77843_CABLE_MHL]			= "MHL",
+	[MAX77843_CABLE_MHL_TA]			= "MHL-TA",
+	[MAX77843_CABLE_JIG_USB_ON]		= "JIG-USB-ON",
+	[MAX77843_CABLE_JIG_USB_OFF]		= "JIG-USB-OFF",
+	[MAX77843_CABLE_JIG_UART_ON]		= "JIG-UART-ON",
+	[MAX77843_CABLE_JIG_UART_OFF]		= "JIG-UART-OFF",
+};
+
+struct max77843_muic_irq {
+	unsigned int irq;
+	const char *name;
+	unsigned int virq;
+};
+
+static struct max77843_muic_irq max77843_muic_irqs[] = {
+	{ MAX77843_MUIC_IRQ_INT1_ADC,		"MUIC-ADC" },
+	{ MAX77843_MUIC_IRQ_INT1_ADCERROR,	"MUIC-ADC_ERROR" },
+	{ MAX77843_MUIC_IRQ_INT1_ADC1K,		"MUIC-ADC1K" },
+	{ MAX77843_MUIC_IRQ_INT2_CHGTYP,	"MUIC-CHGTYP" },
+	{ MAX77843_MUIC_IRQ_INT2_CHGDETRUN,	"MUIC-CHGDETRUN" },
+	{ MAX77843_MUIC_IRQ_INT2_DCDTMR,	"MUIC-DCDTMR" },
+	{ MAX77843_MUIC_IRQ_INT2_DXOVP,		"MUIC-DXOVP" },
+	{ MAX77843_MUIC_IRQ_INT2_VBVOLT,	"MUIC-VBVOLT" },
+	{ MAX77843_MUIC_IRQ_INT3_VBADC,		"MUIC-VBADC" },
+	{ MAX77843_MUIC_IRQ_INT3_VDNMON,	"MUIC-VDNMON" },
+	{ MAX77843_MUIC_IRQ_INT3_DNRES,		"MUIC-DNRES" },
+	{ MAX77843_MUIC_IRQ_INT3_MPNACK,	"MUIC-MPNACK"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXBUFOW,	"MUIC-MRXBUFOW"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXTRF,	"MUIC-MRXTRF"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXPERR,	"MUIC-MRXPERR"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXRDY,	"MUIC-MRXRDY"},
+};
+
+static const struct regmap_config max77843_muic_regmap_config = {
+	.reg_bits       = 8,
+	.val_bits       = 8,
+	.max_register   = MAX77843_MUIC_REG_END,
+};
+
+static const struct regmap_irq max77843_muic_irq[] = {
+	/* INT1 interrupt */
+	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
+	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
+	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
+
+	/* INT2 interrupt */
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
+
+	/* INT3 interrupt */
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
+};
+
+static const struct regmap_irq_chip max77843_muic_irq_chip = {
+	.name           = "max77843-muic",
+	.status_base    = MAX77843_MUIC_REG_INT1,
+	.mask_base      = MAX77843_MUIC_REG_INTMASK1,
+	.mask_invert    = true,
+	.num_regs       = 3,
+	.irqs           = max77843_muic_irq,
+	.num_irqs       = ARRAY_SIZE(max77843_muic_irq),
+};
+
+static int max77843_muic_set_path(struct max77843_muic_info *info,
+		u8 val, bool attached)
+{
+	struct max77843 *max77843 = info->max77843;
+	int ret = 0;
+	unsigned int ctrl1, ctrl2;
+
+	if (attached)
+		ctrl1 = val;
+	else
+		ctrl1 = CONTROL1_SW_OPEN;
+
+	ret = regmap_update_bits(max77843->regmap_muic,
+			MAX77843_MUIC_REG_CONTROL1,
+			CONTROL1_COM_SW, ctrl1);
+	if (ret < 0) {
+		dev_err(info->dev, "Cannot switch MUIC port\n");
+		return ret;
+	}
+
+	if (attached)
+		ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
+	else
+		ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
+
+	ret = regmap_update_bits(max77843->regmap_muic,
+			MAX77843_MUIC_REG_CONTROL2,
+			MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
+			MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
+	if (ret < 0) {
+		dev_err(info->dev, "Cannot update lowpower mode\n");
+		return ret;
+	}
+
+	dev_dbg(info->dev,
+		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
+		ctrl1, ctrl2, attached ? "attached" : "detached");
+
+	return 0;
+}
+
+static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
+		enum max77843_muic_cable_group group, bool *attached)
+{
+	int adc, chg_type, cable_type, gnd_type;
+
+	adc = info->status[MAX77843_MUIC_STATUS1] &
+			MAX77843_MUIC_STATUS1_ADC_MASK;
+	adc >>= STATUS1_ADC_SHIFT;
+
+	switch (group) {
+	case MAX77843_CABLE_GROUP_ADC:
+		if (adc == MAX77843_MUIC_ADC_OPEN) {
+			*attached = false;
+			cable_type = info->prev_cable_type;
+			info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
+		} else {
+			*attached = true;
+			cable_type = info->prev_cable_type = adc;
+		}
+		break;
+	case MAX77843_CABLE_GROUP_CHG:
+		chg_type = info->status[MAX77843_MUIC_STATUS2] &
+				MAX77843_MUIC_STATUS2_CHGTYP_MASK;
+
+		/* Check GROUND accessory with charger cable */
+		if (adc == MAX77843_MUIC_ADC_GROUND) {
+			if (chg_type == MAX77843_MUIC_CHG_NONE) {
+				/* The following state when charger cable is
+				 * disconnected but the GROUND accessory still
+				 * connected */
+				*attached = false;
+				cable_type = info->prev_chg_type;
+				info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
+			} else {
+
+				/* The following state when charger cable is
+				 * connected on the GROUND accessory */
+				*attached = true;
+				cable_type = MAX77843_MUIC_CHG_GND;
+				info->prev_chg_type = MAX77843_MUIC_CHG_GND;
+			}
+			break;
+		}
+
+		if (chg_type == MAX77843_MUIC_CHG_NONE) {
+			*attached = false;
+			cable_type = info->prev_chg_type;
+			info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
+		} else {
+			*attached = true;
+			cable_type = info->prev_chg_type = chg_type;
+		}
+		break;
+	case MAX77843_CABLE_GROUP_ADC_GND:
+		if (adc == MAX77843_MUIC_ADC_OPEN) {
+			*attached = false;
+			cable_type = info->prev_gnd_type;
+			info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
+		} else {
+			*attached = true;
+
+			/* Offset|ADC1K|VBVolt|
+			 *    0x1|    0|     0| USB-HOST
+			 *    0x1|    0|     1| USB-HOST with VB
+			 *    0x1|    1|     0| MHL
+			 *    0x1|    1|     1| MHL with VB */
+			/* Get ADC1K register bit */
+			gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
+					MAX77843_MUIC_STATUS1_ADC1K_MASK);
+
+			/* Get VBVolt register bit */
+			gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
+					MAX77843_MUIC_STATUS2_VBVOLT_MASK);
+			gnd_type >>= STATUS2_VBVOLT_SHIFT;
+
+			/* Offset of GND cable */
+			gnd_type |= MAX77843_MUIC_GND_USB_HOST;
+			cable_type = info->prev_gnd_type = gnd_type;
+		}
+		break;
+	default:
+		dev_err(info->dev, "Unknown cable group (%d)\n", group);
+		cable_type = -EINVAL;
+		break;
+	}
+
+	return cable_type;
+}
+
+static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
+{
+	int ret, gnd_cable_type;
+	bool attached;
+
+	gnd_cable_type = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_ADC_GND, &attached);
+	dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
+			attached ? "attached" : "detached", gnd_cable_type);
+
+	switch (gnd_cable_type) {
+	case MAX77843_MUIC_GND_USB_HOST:
+	case MAX77843_MUIC_GND_USB_HOST_VB:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "USB-HOST", attached);
+		break;
+	case MAX77843_MUIC_GND_MHL_VB:
+	case MAX77843_MUIC_GND_MHL:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "MHL", attached);
+		break;
+	default:
+		dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
+			attached ? "attached" : "detached", gnd_cable_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77843_muic_jig_handler(struct max77843_muic_info *info,
+		int cable_type, bool attached)
+{
+	int ret;
+
+	dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
+			attached ? "attached" : "detached", cable_type);
+
+	switch (cable_type) {
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+		extcon_set_cable_state(info->edev, "JIG-USB-OFF", attached);
+		break;
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+		extcon_set_cable_state(info->edev, "JIG-USB-ON", attached);
+		break;
+	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_UART, attached);
+		if (ret < 0)
+			return ret;
+		extcon_set_cable_state(info->edev, "JIG-UART-OFF", attached);
+		break;
+	default:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	}
+
+	return 0;
+}
+
+static int max77843_muic_adc_handler(struct max77843_muic_info *info)
+{
+	int ret, cable_type;
+	bool attached;
+
+	cable_type = max77843_muic_get_cable_type(info,
+			MAX77843_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 MAX77843_MUIC_ADC_GROUND:
+		ret = max77843_muic_adc_gnd_handler(info);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
+	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
+		ret = max77843_muic_jig_handler(info, cable_type, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX77843_MUIC_ADC_SEND_END_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_1:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_2:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_3:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_4:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_5:
+	case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
+	case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
+	case MAX77843_MUIC_ADC_TTY_CONVERTER:
+	case MAX77843_MUIC_ADC_UART_CABLE:
+	case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
+	case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
+	case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
+	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
+	case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
+	case MAX77843_MUIC_ADC_OPEN:
+		dev_err(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 max77843_muic_chg_handler(struct max77843_muic_info *info)
+{
+	int ret, chg_type, gnd_type;
+	bool attached;
+
+	chg_type = max77843_muic_get_cable_type(info,
+			MAX77843_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 MAX77843_MUIC_CHG_USB:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "USB", attached);
+		break;
+	case MAX77843_MUIC_CHG_DOWNSTREAM:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev,
+				"CHARGER-DOWNSTREAM", attached);
+		break;
+	case MAX77843_MUIC_CHG_DEDICATED:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "TA", attached);
+		break;
+	case MAX77843_MUIC_CHG_SPECIAL_500MA:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "SLOW-CHAREGER", attached);
+		break;
+	case MAX77843_MUIC_CHG_SPECIAL_1A:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "FAST-CHARGER", attached);
+		break;
+	case MAX77843_MUIC_CHG_GND:
+		gnd_type = max77843_muic_get_cable_type(info,
+				MAX77843_CABLE_GROUP_ADC_GND, &attached);
+
+		/* Charger cable on MHL accessory is attach or detach */
+		if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
+			extcon_set_cable_state(info->edev, "MHL-TA", true);
+		else if (gnd_type == MAX77843_MUIC_GND_MHL)
+			extcon_set_cable_state(info->edev, "MHL-TA", false);
+		break;
+	case MAX77843_MUIC_CHG_NONE:
+		break;
+	default:
+		dev_err(info->dev,
+			"failed to detect %s accessory (chg_type:0x%x)\n",
+			attached ? "attached" : "detached", chg_type);
+
+		max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void max77843_muic_irq_work(struct work_struct *work)
+{
+	struct max77843_muic_info *info = container_of(work,
+			struct max77843_muic_info, irq_work);
+	struct max77843 *max77843 = info->max77843;
+	int ret = 0;
+
+	mutex_lock(&info->mutex);
+
+	ret = regmap_bulk_read(max77843->regmap_muic,
+			MAX77843_MUIC_REG_STATUS1, info->status,
+			MAX77843_MUIC_STATUS_NUM);
+	if (ret) {
+		dev_err(info->dev, "Cannot read STATUS registers\n");
+		mutex_unlock(&info->mutex);
+		return;
+	}
+
+	if (info->irq_adc) {
+		ret = max77843_muic_adc_handler(info);
+		if (ret)
+			dev_err(info->dev, "Unknown cable type\n");
+		info->irq_adc = false;
+	}
+
+	if (info->irq_chg) {
+		ret = max77843_muic_chg_handler(info);
+		if (ret)
+			dev_err(info->dev, "Unknown charger type\n");
+		info->irq_chg = false;
+	}
+
+	mutex_unlock(&info->mutex);
+}
+
+static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
+{
+	struct max77843_muic_info *info = data;
+	int i, irq_type = -1;
+
+	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
+		if (irq == max77843_muic_irqs[i].virq)
+			irq_type = max77843_muic_irqs[i].irq;
+
+	switch (irq_type) {
+	case MAX77843_MUIC_IRQ_INT1_ADC:
+	case MAX77843_MUIC_IRQ_INT1_ADCERROR:
+	case MAX77843_MUIC_IRQ_INT1_ADC1K:
+		info->irq_adc = true;
+		break;
+	case MAX77843_MUIC_IRQ_INT2_CHGTYP:
+	case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
+	case MAX77843_MUIC_IRQ_INT2_DCDTMR:
+	case MAX77843_MUIC_IRQ_INT2_DXOVP:
+	case MAX77843_MUIC_IRQ_INT2_VBVOLT:
+		info->irq_chg = true;
+		break;
+	case MAX77843_MUIC_IRQ_INT3_VBADC:
+	case MAX77843_MUIC_IRQ_INT3_VDNMON:
+	case MAX77843_MUIC_IRQ_INT3_DNRES:
+	case MAX77843_MUIC_IRQ_INT3_MPNACK:
+	case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
+	case MAX77843_MUIC_IRQ_INT3_MRXTRF:
+	case MAX77843_MUIC_IRQ_INT3_MRXPERR:
+	case MAX77843_MUIC_IRQ_INT3_MRXRDY:
+		break;
+	default:
+		dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
+		break;
+	}
+
+	schedule_work(&info->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static void max77843_muic_detect_cable_wq(struct work_struct *work)
+{
+	struct max77843_muic_info *info = container_of(to_delayed_work(work),
+			struct max77843_muic_info, wq_detcable);
+	struct max77843 *max77843 = info->max77843;
+	int chg_type, adc, ret;
+	bool attached;
+
+	mutex_lock(&info->mutex);
+
+	ret = regmap_bulk_read(max77843->regmap_muic,
+			MAX77843_MUIC_REG_STATUS1, info->status,
+			MAX77843_MUIC_STATUS_NUM);
+	if (ret) {
+		dev_err(info->dev, "Cannot read STATUS registers\n");
+		goto err_cable_wq;
+	}
+
+	adc = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_ADC, &attached);
+	if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
+		ret = max77843_muic_adc_handler(info);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot detect accessory\n");
+			goto err_cable_wq;
+		}
+	}
+
+	chg_type = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_CHG, &attached);
+	if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
+		ret = max77843_muic_chg_handler(info);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot detect charger accessory\n");
+			goto err_cable_wq;
+		}
+	}
+
+err_cable_wq:
+	mutex_unlock(&info->mutex);
+}
+
+static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
+		enum max77843_muic_adc_debounce_time time)
+{
+	struct max77843 *max77843 = info->max77843;
+	unsigned int ret;
+
+	switch (time) {
+	case MAX77843_DEBOUNCE_TIME_5MS:
+	case MAX77843_DEBOUNCE_TIME_10MS:
+	case MAX77843_DEBOUNCE_TIME_25MS:
+	case MAX77843_DEBOUNCE_TIME_38_62MS:
+		ret = regmap_update_bits(max77843->regmap_muic,
+				MAX77843_MUIC_REG_CONTROL4,
+				MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
+				time << CONTROL4_ADCDBSET_SHIFT);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot write MUIC regmap\n");
+			return ret;
+		}
+		break;
+	default:
+		dev_err(info->dev, "Invalid ADC debounce time\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77843_init_muic_regmap(struct max77843 *max77843)
+{
+	int ret;
+
+	max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
+			I2C_ADDR_MUIC);
+	if (!max77843->i2c_muic) {
+		dev_err(&max77843->i2c->dev,
+				"Cannot allocate I2C device for MUIC\n");
+		return PTR_ERR(max77843->i2c_muic);
+	}
+
+	i2c_set_clientdata(max77843->i2c_muic, max77843);
+
+	max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
+			&max77843_muic_regmap_config);
+	if (IS_ERR(max77843->regmap_muic)) {
+		ret = PTR_ERR(max77843->regmap_muic);
+		goto err_muic_i2c;
+	}
+
+	ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
+			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
+			0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
+	if (ret < 0) {
+		dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
+		goto err_muic_i2c;
+	}
+
+	return 0;
+
+err_muic_i2c:
+	i2c_unregister_device(max77843->i2c_muic);
+
+	return ret;
+}
+
+static int max77843_muic_probe(struct platform_device *pdev)
+{
+	struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
+	struct max77843_muic_info *info;
+	unsigned int id;
+	int i, ret;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+	info->max77843 = max77843;
+
+	platform_set_drvdata(pdev, info);
+	mutex_init(&info->mutex);
+
+	/* Initialize i2c and regmap */
+	ret = max77843_init_muic_regmap(max77843);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
+		return ret;
+	}
+
+	/* Turn off auto detection configuration */
+	ret = regmap_update_bits(max77843->regmap_muic,
+			MAX77843_MUIC_REG_CONTROL4,
+			MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
+			MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
+			CONTROL4_AUTO_DISABLE);
+
+	/* Initialize extcon device */
+	info->edev = devm_extcon_dev_allocate(&pdev->dev,
+			max77843_extcon_cable);
+	if (IS_ERR(info->edev)) {
+		dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
+		ret = -ENODEV;
+		goto err_muic_irq;
+	}
+
+	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register extcon device\n");
+		goto err_muic_irq;
+	}
+
+	/* Set ADC debounce time */
+	max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
+
+	/* Set initial path for UART */
+	max77843_muic_set_path(info, CONTROL1_SW_UART, true);
+
+	/* Check revision number of MUIC device */
+	ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to read revision number\n");
+		goto err_muic_irq;
+	}
+	dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
+
+	/* Support virtual irq domain for max77843 MUIC device */
+	INIT_WORK(&info->irq_work, max77843_muic_irq_work);
+
+	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
+		struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
+		unsigned int virq = 0;
+
+		virq = regmap_irq_get_virq(max77843->irq_data_muic,
+				muic_irq->irq);
+		if (virq <= 0) {
+			ret = -EINVAL;
+			goto err_muic_irq;
+		}
+		muic_irq->virq = virq;
+
+		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
+				max77843_muic_irq_handler, IRQF_NO_SUSPEND,
+				muic_irq->name, info);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Failed to request irq (IRQ: %d, error: %d)\n",
+				muic_irq->irq, ret);
+			goto err_muic_irq;
+		}
+	}
+
+	/* Detect accessory after completing the initialization of platform */
+	INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
+	queue_delayed_work(system_power_efficient_wq,
+			&info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
+
+	return 0;
+
+err_muic_irq:
+	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
+	i2c_unregister_device(max77843->i2c_muic);
+
+	return ret;
+}
+
+static int max77843_muic_remove(struct platform_device *pdev)
+{
+	struct max77843_muic_info *info = platform_get_drvdata(pdev);
+	struct max77843 *max77843 = info->max77843;
+
+	cancel_work_sync(&info->irq_work);
+	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
+	i2c_unregister_device(max77843->i2c_muic);
+
+	return 0;
+}
+
+static const struct platform_device_id max77843_muic_id[] = {
+	{ "max77843-muic", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(platform, max77843_muic_id);
+
+static struct platform_driver max77843_muic_driver = {
+	.driver		= {
+		.name		= "max77843-muic",
+	},
+	.probe		= max77843_muic_probe,
+	.remove		= max77843_muic_remove,
+	.id_table	= max77843_muic_id,
+};
+
+static int __init max77843_muic_init(void)
+{
+	return platform_driver_register(&max77843_muic_driver);
+}
+subsys_initcall(max77843_muic_init);
+
+MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
+MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
+MODULE_LICENSE("GPL");