drivers/extcon/extcon-sm5502.c - kernel/msm-4.9 - Gitiles

 /*
  * extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier to support USB switches
  *
  * Copyright (c) 2014 Samsung Electronics Co., Ltd
  * Author: 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.
  */

 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/extcon.h>

 #include "extcon-sm5502.h"

 #define	DELAY_MS_DEFAULT		17000	/* unit: millisecond */

 struct muic_irq {
 	unsigned int irq;
 	const char *name;
 	unsigned int virq;
 };

 struct reg_data {
 	u8 reg;
 	unsigned int val;
 	bool invert;
 };

 struct sm5502_muic_info {
 	struct device *dev;
 	struct extcon_dev *edev;

 	struct i2c_client *i2c;
 	struct regmap *regmap;

 	struct regmap_irq_chip_data *irq_data;
 	struct muic_irq *muic_irqs;
 	unsigned int num_muic_irqs;
 	int irq;
 	bool irq_attach;
 	bool irq_detach;
 	struct work_struct irq_work;

 	struct reg_data *reg_data;
 	unsigned int num_reg_data;

 	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 value of SM5502 register to bring up MUIC device. */
 static struct reg_data sm5502_reg_data[] = {
 	{
 		.reg = SM5502_REG_CONTROL,
 		.val = SM5502_REG_CONTROL_MASK_INT_MASK,
 		.invert = false,
 	}, {
 		.reg = SM5502_REG_INTMASK1,
 		.val = SM5502_REG_INTM1_KP_MASK
 			| SM5502_REG_INTM1_LKP_MASK
 			| SM5502_REG_INTM1_LKR_MASK,
 		.invert = true,
 	}, {
 		.reg = SM5502_REG_INTMASK2,
 		.val = SM5502_REG_INTM2_VBUS_DET_MASK
 			| SM5502_REG_INTM2_REV_ACCE_MASK
 			| SM5502_REG_INTM2_ADC_CHG_MASK
 			| SM5502_REG_INTM2_STUCK_KEY_MASK
 			| SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
 			| SM5502_REG_INTM2_MHL_MASK,
 		.invert = true,
 	},
 	{ }
 };

 /* List of detectable cables */
 enum {
 	EXTCON_CABLE_USB = 0,
 	EXTCON_CABLE_USB_HOST,
 	EXTCON_CABLE_TA,

 	EXTCON_CABLE_END,
 };

 static const char *sm5502_extcon_cable[] = {
 	[EXTCON_CABLE_USB]	= "USB",
 	[EXTCON_CABLE_USB_HOST]	= "USB-Host",
 	[EXTCON_CABLE_TA]	= "TA",
 	NULL,
 };

 /* Define supported accessory type */
 enum sm5502_muic_acc_type {
 	SM5502_MUIC_ADC_GROUND = 0x0,
 	SM5502_MUIC_ADC_SEND_END_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
 	SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
 	SM5502_MUIC_ADC_RESERVED_ACC_1,
 	SM5502_MUIC_ADC_RESERVED_ACC_2,
 	SM5502_MUIC_ADC_RESERVED_ACC_3,
 	SM5502_MUIC_ADC_RESERVED_ACC_4,
 	SM5502_MUIC_ADC_RESERVED_ACC_5,
 	SM5502_MUIC_ADC_AUDIO_TYPE2,
 	SM5502_MUIC_ADC_PHONE_POWERED_DEV,
 	SM5502_MUIC_ADC_TTY_CONVERTER,
 	SM5502_MUIC_ADC_UART_CABLE,
 	SM5502_MUIC_ADC_TYPE1_CHARGER,
 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
 	SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
 	SM5502_MUIC_ADC_TYPE2_CHARGER,
 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
 	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
 	SM5502_MUIC_ADC_AUDIO_TYPE1,
 	SM5502_MUIC_ADC_OPEN = 0x1f,

 	/* The below accessories have same ADC value (0x1f or 0x1e).
 	   So, Device type1 is used to separate specific accessory. */
 							/* |---------|--ADC| */
 							/* |    [7:5]|[4:0]| */
 	SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e,	/* |      001|11110| */
 	SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e,	/* |      010|11110| */
 							/* |Dev Type1|--ADC| */
 	SM5502_MUIC_ADC_OPEN_USB = 0x5f,		/* |      010|11111| */
 	SM5502_MUIC_ADC_OPEN_TA = 0xdf,			/* |      110|11111| */
 	SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff,		/* |      111|11111| */
 };

 /* List of supported interrupt for SM5502 */
 static struct muic_irq sm5502_muic_irqs[] = {
 	{ SM5502_IRQ_INT1_ATTACH,	"muic-attach" },
 	{ SM5502_IRQ_INT1_DETACH,	"muic-detach" },
 	{ SM5502_IRQ_INT1_KP,		"muic-kp" },
 	{ SM5502_IRQ_INT1_LKP,		"muic-lkp" },
 	{ SM5502_IRQ_INT1_LKR,		"muic-lkr" },
 	{ SM5502_IRQ_INT1_OVP_EVENT,	"muic-ovp-event" },
 	{ SM5502_IRQ_INT1_OCP_EVENT,	"muic-ocp-event" },
 	{ SM5502_IRQ_INT1_OVP_OCP_DIS,	"muic-ovp-ocp-dis" },
 	{ SM5502_IRQ_INT2_VBUS_DET,	"muic-vbus-det" },
 	{ SM5502_IRQ_INT2_REV_ACCE,	"muic-rev-acce" },
 	{ SM5502_IRQ_INT2_ADC_CHG,	"muic-adc-chg" },
 	{ SM5502_IRQ_INT2_STUCK_KEY,	"muic-stuck-key" },
 	{ SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
 	{ SM5502_IRQ_INT2_MHL,		"muic-mhl" },
 };

 /* Define interrupt list of SM5502 to register regmap_irq */
 static const struct regmap_irq sm5502_irqs[] = {
 	/* INT1 interrupts */
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
 	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },

 	/* INT2 interrupts */
 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
 	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
 };

 static const struct regmap_irq_chip sm5502_muic_irq_chip = {
 	.name			= "sm5502",
 	.status_base		= SM5502_REG_INT1,
 	.mask_base		= SM5502_REG_INTMASK1,
 	.mask_invert		= false,
 	.num_regs		= 2,
 	.irqs			= sm5502_irqs,
 	.num_irqs		= ARRAY_SIZE(sm5502_irqs),
 };

 /* Define regmap configuration of SM5502 for I2C communication  */
 static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case SM5502_REG_INTMASK1:
 	case SM5502_REG_INTMASK2:
 		return true;
 	default:
 		break;
 	}
 	return false;
 }

 static const struct regmap_config sm5502_muic_regmap_config = {
 	.reg_bits	= 8,
 	.val_bits	= 8,
 	.volatile_reg	= sm5502_muic_volatile_reg,
 	.max_register	= SM5502_REG_END,
 };

 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
 static int sm5502_muic_set_path(struct sm5502_muic_info *info,
 				unsigned int con_sw, unsigned int vbus_sw,
 				bool attached)
 {
 	int ret;

 	if (!attached) {
 		con_sw	= DM_DP_SWITCH_OPEN;
 		vbus_sw	= VBUSIN_SWITCH_OPEN;
 	}

 	switch (con_sw) {
 	case DM_DP_SWITCH_OPEN:
 	case DM_DP_SWITCH_USB:
 	case DM_DP_SWITCH_AUDIO:
 	case DM_DP_SWITCH_UART:
 		ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
 					 SM5502_REG_MANUAL_SW1_DP_MASK |
 					 SM5502_REG_MANUAL_SW1_DM_MASK,
 					 con_sw);
 		if (ret < 0) {
 			dev_err(info->dev,
 				"cannot update DM_CON/DP_CON switch\n");
 			return ret;
 		}
 		break;
 	default:
 		dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
 				con_sw);
 		return -EINVAL;
 	};

 	switch (vbus_sw) {
 	case VBUSIN_SWITCH_OPEN:
 	case VBUSIN_SWITCH_VBUSOUT:
 	case VBUSIN_SWITCH_MIC:
 	case VBUSIN_SWITCH_VBUSOUT_WITH_USB:
 		ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
 					 SM5502_REG_MANUAL_SW1_VBUSIN_MASK,
 					 vbus_sw);
 		if (ret < 0) {
 			dev_err(info->dev,
 				"cannot update VBUSIN switch\n");
 			return ret;
 		}
 		break;
 	default:
 		dev_err(info->dev, "Unknown VBUS switch type (%d)\n", vbus_sw);
 		return -EINVAL;
 	};

 	return 0;
 }

 /* Return cable type of attached or detached accessories */
 static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
 {
 	unsigned int cable_type = -1, adc, dev_type1;
 	int ret;

 	/* Read ADC value according to external cable or button */
 	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
 	if (ret) {
 		dev_err(info->dev, "failed to read ADC register\n");
 		return ret;
 	}

 	/*
 	 * If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
 	 * connected with to MUIC device.
 	 */
 	cable_type = adc & SM5502_REG_ADC_MASK;
 	if (cable_type == SM5502_MUIC_ADC_GROUND)
 		return SM5502_MUIC_ADC_GROUND;

 	switch (cable_type) {
 	case SM5502_MUIC_ADC_GROUND:
 	case SM5502_MUIC_ADC_SEND_END_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
 	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
 	case SM5502_MUIC_ADC_RESERVED_ACC_1:
 	case SM5502_MUIC_ADC_RESERVED_ACC_2:
 	case SM5502_MUIC_ADC_RESERVED_ACC_3:
 	case SM5502_MUIC_ADC_RESERVED_ACC_4:
 	case SM5502_MUIC_ADC_RESERVED_ACC_5:
 	case SM5502_MUIC_ADC_AUDIO_TYPE2:
 	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
 	case SM5502_MUIC_ADC_TTY_CONVERTER:
 	case SM5502_MUIC_ADC_UART_CABLE:
 	case SM5502_MUIC_ADC_TYPE1_CHARGER:
 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
 	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
 	case SM5502_MUIC_ADC_TYPE2_CHARGER:
 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
 	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
 		break;
 	case SM5502_MUIC_ADC_AUDIO_TYPE1:
 		/*
 		 * Check whether cable type is
 		 * SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
 		 * or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
 		 * by using Button event.
 		 */
 		break;
 	case SM5502_MUIC_ADC_OPEN:
 		ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
 				  &dev_type1);
 		if (ret) {
 			dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
 			return ret;
 		}

 		switch (dev_type1) {
 		case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
 			cable_type = SM5502_MUIC_ADC_OPEN_USB;
 			break;
 		case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
 			cable_type = SM5502_MUIC_ADC_OPEN_TA;
 			break;
 		case SM5502_REG_DEV_TYPE1_USB_OTG_MASK:
 			cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
 			break;
 		default:
 			dev_dbg(info->dev,
 				"cannot identify the cable type: adc(0x%x) "
 				"dev_type1(0x%x)\n", adc, dev_type1);
 			return -EINVAL;
 		};
 		break;
 	default:
 		dev_err(info->dev,
 			"failed to identify the cable type: adc(0x%x)\n", adc);
 		return -EINVAL;
 	};

 	return cable_type;
 }

 static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
 				     bool attached)
 {
 	static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
 	const char **cable_names = info->edev->supported_cable;
 	unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
 	unsigned int con_sw = DM_DP_SWITCH_OPEN;
 	unsigned int vbus_sw = VBUSIN_SWITCH_OPEN;
 	unsigned int idx = 0;
 	int ret;

 	if (!cable_names)
 		return 0;

 	/* Get the type of attached or detached cable */
 	if (attached)
 		cable_type = sm5502_muic_get_cable_type(info);
 	else
 		cable_type = prev_cable_type;
 	prev_cable_type = cable_type;

 	switch (cable_type) {
 	case SM5502_MUIC_ADC_OPEN_USB:
 		idx	= EXTCON_CABLE_USB;
 		con_sw	= DM_DP_SWITCH_USB;
 		vbus_sw	= VBUSIN_SWITCH_VBUSOUT_WITH_USB;
 		break;
 	case SM5502_MUIC_ADC_OPEN_TA:
 		idx	= EXTCON_CABLE_TA;
 		con_sw	= DM_DP_SWITCH_OPEN;
 		vbus_sw	= VBUSIN_SWITCH_VBUSOUT;
 		break;
 	case SM5502_MUIC_ADC_OPEN_USB_OTG:
 		idx	= EXTCON_CABLE_USB_HOST;
 		con_sw	= DM_DP_SWITCH_USB;
 		vbus_sw	= VBUSIN_SWITCH_OPEN;
 		break;
 	default:
 		dev_dbg(info->dev,
 			"cannot handle this cable_type (0x%x)\n", cable_type);
 		return 0;
 	};

 	/* Change internal hardware path(DM_CON/DP_CON, VBUSIN) */
 	ret = sm5502_muic_set_path(info, con_sw, vbus_sw, attached);
 	if (ret < 0)
 		return ret;

 	/* Change the state of external accessory */
 	extcon_set_cable_state(info->edev, cable_names[idx], attached);

 	return 0;
 }

 static void sm5502_muic_irq_work(struct work_struct *work)
 {
 	struct sm5502_muic_info *info = container_of(work,
 			struct sm5502_muic_info, irq_work);
 	int ret = 0;

 	if (!info->edev)
 		return;

 	mutex_lock(&info->mutex);

 	/* Detect attached or detached cables */
 	if (info->irq_attach) {
 		ret = sm5502_muic_cable_handler(info, true);
 		info->irq_attach = false;
 	}
 	if (info->irq_detach) {
 		ret = sm5502_muic_cable_handler(info, false);
 		info->irq_detach = false;
 	}

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

 	mutex_unlock(&info->mutex);
 }

 /*
  * Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
  * Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
  */
 static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
 {
 	switch (irq_type) {
 	case SM5502_IRQ_INT1_ATTACH:
 		info->irq_attach = true;
 		break;
 	case SM5502_IRQ_INT1_DETACH:
 		info->irq_detach = true;
 		break;
 	case SM5502_IRQ_INT1_KP:
 	case SM5502_IRQ_INT1_LKP:
 	case SM5502_IRQ_INT1_LKR:
 	case SM5502_IRQ_INT1_OVP_EVENT:
 	case SM5502_IRQ_INT1_OCP_EVENT:
 	case SM5502_IRQ_INT1_OVP_OCP_DIS:
 	case SM5502_IRQ_INT2_VBUS_DET:
 	case SM5502_IRQ_INT2_REV_ACCE:
 	case SM5502_IRQ_INT2_ADC_CHG:
 	case SM5502_IRQ_INT2_STUCK_KEY:
 	case SM5502_IRQ_INT2_STUCK_KEY_RCV:
 	case SM5502_IRQ_INT2_MHL:
 	default:
 		break;
 	}

 	return 0;
 }

 static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
 {
 	struct sm5502_muic_info *info = data;
 	int i, irq_type = -1, ret;

 	for (i = 0; i < info->num_muic_irqs; i++)
 		if (irq == info->muic_irqs[i].virq)
 			irq_type = info->muic_irqs[i].irq;

 	ret = sm5502_parse_irq(info, irq_type);
 	if (ret < 0) {
 		dev_warn(info->dev, "cannot handle is interrupt:%d\n",
 				    irq_type);
 		return IRQ_HANDLED;
 	}
 	schedule_work(&info->irq_work);

 	return IRQ_HANDLED;
 }

 static void sm5502_muic_detect_cable_wq(struct work_struct *work)
 {
 	struct sm5502_muic_info *info = container_of(to_delayed_work(work),
 				struct sm5502_muic_info, wq_detcable);
 	int ret;

 	/* Notify the state of connector cable or not  */
 	ret = sm5502_muic_cable_handler(info, true);
 	if (ret < 0)
 		dev_warn(info->dev, "failed to detect cable state\n");
 }

 static void sm5502_init_dev_type(struct sm5502_muic_info *info)
 {
 	unsigned int reg_data, vendor_id, version_id;
 	int i, ret;

 	/* To test I2C, Print version_id and vendor_id of SM5502 */
 	ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
 	if (ret) {
 		dev_err(info->dev,
 			"failed to read DEVICE_ID register: %d\n", ret);
 		return;
 	}

 	vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
 				SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
 	version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
 				SM5502_REG_DEVICE_ID_VERSION_SHIFT);

 	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 			    version_id, vendor_id);

 	/* Initiazle the register of SM5502 device to bring-up */
 	for (i = 0; i < info->num_reg_data; i++) {
 		unsigned int val = 0;

 		if (!info->reg_data[i].invert)
 			val |= ~info->reg_data[i].val;
 		else
 			val = info->reg_data[i].val;
 		regmap_write(info->regmap, info->reg_data[i].reg, val);
 	}
 }

 static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
 				 const struct i2c_device_id *id)
 {
 	struct device_node *np = i2c->dev.of_node;
 	struct sm5502_muic_info *info;
 	int i, ret, irq_flags;

 	if (!np)
 		return -EINVAL;

 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 	i2c_set_clientdata(i2c, info);

 	info->dev = &i2c->dev;
 	info->i2c = i2c;
 	info->irq = i2c->irq;
 	info->muic_irqs = sm5502_muic_irqs;
 	info->num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs);
 	info->reg_data = sm5502_reg_data;
 	info->num_reg_data = ARRAY_SIZE(sm5502_reg_data);

 	mutex_init(&info->mutex);

 	INIT_WORK(&info->irq_work, sm5502_muic_irq_work);

 	info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
 	if (IS_ERR(info->regmap)) {
 		ret = PTR_ERR(info->regmap);
 		dev_err(info->dev, "failed to allocate register map: %d\n",
 				   ret);
 		return ret;
 	}

 	/* Support irq domain for SM5502 MUIC device */
 	irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
 				  &sm5502_muic_irq_chip, &info->irq_data);
 	if (ret != 0) {
 		dev_err(info->dev, "failed to request IRQ %d: %d\n",
 				    info->irq, ret);
 		return ret;
 	}

 	for (i = 0; i < info->num_muic_irqs; i++) {
 		struct muic_irq *muic_irq = &info->muic_irqs[i];
 		unsigned int virq = 0;

 		virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
 		if (virq <= 0)
 			return -EINVAL;
 		muic_irq->virq = virq;

 		ret = devm_request_threaded_irq(info->dev, virq, NULL,
 						sm5502_muic_irq_handler,
 						IRQF_NO_SUSPEND,
 						muic_irq->name, info);
 		if (ret) {
 			dev_err(info->dev,
 				"failed: irq request (IRQ: %d, error :%d)\n",
 				muic_irq->irq, ret);
 			return ret;
 		}
 	}

 	/* Allocate extcon device */
 	info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
 	if (IS_ERR(info->edev)) {
 		dev_err(info->dev, "failed to allocate memory for extcon\n");
 		return -ENOMEM;
 	}
 	info->edev->name = np->name;

 	/* Register extcon device */
 	ret = devm_extcon_dev_register(info->dev, info->edev);
 	if (ret) {
 		dev_err(info->dev, "failed to register extcon device\n");
 		return ret;
 	}

 	/*
 	 * 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, sm5502_muic_detect_cable_wq);
 	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 			msecs_to_jiffies(DELAY_MS_DEFAULT));

 	/* Initialize SM5502 device and print vendor id and version id */
 	sm5502_init_dev_type(info);

 	return 0;
 }

 static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
 {
 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

 	regmap_del_irq_chip(info->irq, info->irq_data);

 	return 0;
 }

 static struct of_device_id sm5502_dt_match[] = {
 	{ .compatible = "siliconmitus,sm5502-muic" },
 	{ },
 };

 #ifdef CONFIG_PM_SLEEP
 static int sm5502_muic_suspend(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

 	enable_irq_wake(info->irq);

 	return 0;
 }

 static int sm5502_muic_resume(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

 	disable_irq_wake(info->irq);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
 			 sm5502_muic_suspend, sm5502_muic_resume);

 static const struct i2c_device_id sm5502_i2c_id[] = {
 	{ "sm5502", TYPE_SM5502 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);

 static struct i2c_driver sm5502_muic_i2c_driver = {
 	.driver		= {
 		.name	= "sm5502",
 		.owner	= THIS_MODULE,
 		.pm	= &sm5502_muic_pm_ops,
 		.of_match_table = sm5502_dt_match,
 	},
 	.probe	= sm5022_muic_i2c_probe,
 	.remove	= sm5502_muic_i2c_remove,
 	.id_table = sm5502_i2c_id,
 };

 static int __init sm5502_muic_i2c_init(void)
 {
 	return i2c_add_driver(&sm5502_muic_i2c_driver);
 }
 subsys_initcall(sm5502_muic_i2c_init);

 MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 MODULE_LICENSE("GPL");
	/*
	* extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier to support USB switches
	*
	* Copyright (c) 2014 Samsung Electronics Co., Ltd
	* Author: 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.
	*/

	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/irqdomain.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <linux/extcon.h>

	#include "extcon-sm5502.h"

	#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */

	struct muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
	};

	struct reg_data {
	u8 reg;
	unsigned int val;
	bool invert;
	};

	struct sm5502_muic_info {
	struct device *dev;
	struct extcon_dev *edev;

	struct i2c_client *i2c;
	struct regmap *regmap;

	struct regmap_irq_chip_data *irq_data;
	struct muic_irq *muic_irqs;
	unsigned int num_muic_irqs;
	int irq;
	bool irq_attach;
	bool irq_detach;
	struct work_struct irq_work;

	struct reg_data *reg_data;
	unsigned int num_reg_data;

	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 value of SM5502 register to bring up MUIC device. */
	static struct reg_data sm5502_reg_data[] = {
	{
	.reg = SM5502_REG_CONTROL,
	.val = SM5502_REG_CONTROL_MASK_INT_MASK,
	.invert = false,
	}, {
	.reg = SM5502_REG_INTMASK1,
	.val = SM5502_REG_INTM1_KP_MASK
	\| SM5502_REG_INTM1_LKP_MASK
	\| SM5502_REG_INTM1_LKR_MASK,
	.invert = true,
	}, {
	.reg = SM5502_REG_INTMASK2,
	.val = SM5502_REG_INTM2_VBUS_DET_MASK
	\| SM5502_REG_INTM2_REV_ACCE_MASK
	\| SM5502_REG_INTM2_ADC_CHG_MASK
	\| SM5502_REG_INTM2_STUCK_KEY_MASK
	\| SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
	\| SM5502_REG_INTM2_MHL_MASK,
	.invert = true,
	},
	{ }
	};

	/* List of detectable cables */
	enum {
	EXTCON_CABLE_USB = 0,
	EXTCON_CABLE_USB_HOST,
	EXTCON_CABLE_TA,

	EXTCON_CABLE_END,
	};

	static const char *sm5502_extcon_cable[] = {
	[EXTCON_CABLE_USB] = "USB",
	[EXTCON_CABLE_USB_HOST] = "USB-Host",
	[EXTCON_CABLE_TA] = "TA",
	NULL,
	};

	/* Define supported accessory type */
	enum sm5502_muic_acc_type {
	SM5502_MUIC_ADC_GROUND = 0x0,
	SM5502_MUIC_ADC_SEND_END_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
	SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
	SM5502_MUIC_ADC_RESERVED_ACC_1,
	SM5502_MUIC_ADC_RESERVED_ACC_2,
	SM5502_MUIC_ADC_RESERVED_ACC_3,
	SM5502_MUIC_ADC_RESERVED_ACC_4,
	SM5502_MUIC_ADC_RESERVED_ACC_5,
	SM5502_MUIC_ADC_AUDIO_TYPE2,
	SM5502_MUIC_ADC_PHONE_POWERED_DEV,
	SM5502_MUIC_ADC_TTY_CONVERTER,
	SM5502_MUIC_ADC_UART_CABLE,
	SM5502_MUIC_ADC_TYPE1_CHARGER,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
	SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
	SM5502_MUIC_ADC_TYPE2_CHARGER,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
	SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
	SM5502_MUIC_ADC_AUDIO_TYPE1,
	SM5502_MUIC_ADC_OPEN = 0x1f,

	/* The below accessories have same ADC value (0x1f or 0x1e).
	So, Device type1 is used to separate specific accessory. */
	/* \|---------\|--ADC\| */
	/* \| [7:5]\|[4:0]\| */
	SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e, /* \| 001\|11110\| */
	SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e, /* \| 010\|11110\| */
	/* \|Dev Type1\|--ADC\| */
	SM5502_MUIC_ADC_OPEN_USB = 0x5f, /* \| 010\|11111\| */
	SM5502_MUIC_ADC_OPEN_TA = 0xdf, /* \| 110\|11111\| */
	SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff, /* \| 111\|11111\| */
	};

	/* List of supported interrupt for SM5502 */
	static struct muic_irq sm5502_muic_irqs[] = {
	{ SM5502_IRQ_INT1_ATTACH, "muic-attach" },
	{ SM5502_IRQ_INT1_DETACH, "muic-detach" },
	{ SM5502_IRQ_INT1_KP, "muic-kp" },
	{ SM5502_IRQ_INT1_LKP, "muic-lkp" },
	{ SM5502_IRQ_INT1_LKR, "muic-lkr" },
	{ SM5502_IRQ_INT1_OVP_EVENT, "muic-ovp-event" },
	{ SM5502_IRQ_INT1_OCP_EVENT, "muic-ocp-event" },
	{ SM5502_IRQ_INT1_OVP_OCP_DIS, "muic-ovp-ocp-dis" },
	{ SM5502_IRQ_INT2_VBUS_DET, "muic-vbus-det" },
	{ SM5502_IRQ_INT2_REV_ACCE, "muic-rev-acce" },
	{ SM5502_IRQ_INT2_ADC_CHG, "muic-adc-chg" },
	{ SM5502_IRQ_INT2_STUCK_KEY, "muic-stuck-key" },
	{ SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
	{ SM5502_IRQ_INT2_MHL, "muic-mhl" },
	};

	/* Define interrupt list of SM5502 to register regmap_irq */
	static const struct regmap_irq sm5502_irqs[] = {
	/* INT1 interrupts */
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
	{ .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },

	/* INT2 interrupts */
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
	{ .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
	};

	static const struct regmap_irq_chip sm5502_muic_irq_chip = {
	.name = "sm5502",
	.status_base = SM5502_REG_INT1,
	.mask_base = SM5502_REG_INTMASK1,
	.mask_invert = false,
	.num_regs = 2,
	.irqs = sm5502_irqs,
	.num_irqs = ARRAY_SIZE(sm5502_irqs),
	};

	/* Define regmap configuration of SM5502 for I2C communication */
	static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case SM5502_REG_INTMASK1:
	case SM5502_REG_INTMASK2:
	return true;
	default:
	break;
	}
	return false;
	}

	static const struct regmap_config sm5502_muic_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = sm5502_muic_volatile_reg,
	.max_register = SM5502_REG_END,
	};

	/* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
	static int sm5502_muic_set_path(struct sm5502_muic_info *info,
	unsigned int con_sw, unsigned int vbus_sw,
	bool attached)
	{
	int ret;

	if (!attached) {
	con_sw = DM_DP_SWITCH_OPEN;
	vbus_sw = VBUSIN_SWITCH_OPEN;
	}

	switch (con_sw) {
	case DM_DP_SWITCH_OPEN:
	case DM_DP_SWITCH_USB:
	case DM_DP_SWITCH_AUDIO:
	case DM_DP_SWITCH_UART:
	ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
	SM5502_REG_MANUAL_SW1_DP_MASK \|
	SM5502_REG_MANUAL_SW1_DM_MASK,
	con_sw);
	if (ret < 0) {
	dev_err(info->dev,
	"cannot update DM_CON/DP_CON switch\n");
	return ret;
	}
	break;
	default:
	dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
	con_sw);
	return -EINVAL;
	};

	switch (vbus_sw) {
	case VBUSIN_SWITCH_OPEN:
	case VBUSIN_SWITCH_VBUSOUT:
	case VBUSIN_SWITCH_MIC:
	case VBUSIN_SWITCH_VBUSOUT_WITH_USB:
	ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
	SM5502_REG_MANUAL_SW1_VBUSIN_MASK,
	vbus_sw);
	if (ret < 0) {
	dev_err(info->dev,
	"cannot update VBUSIN switch\n");
	return ret;
	}
	break;
	default:
	dev_err(info->dev, "Unknown VBUS switch type (%d)\n", vbus_sw);
	return -EINVAL;
	};

	return 0;
	}

	/* Return cable type of attached or detached accessories */
	static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
	{
	unsigned int cable_type = -1, adc, dev_type1;
	int ret;

	/* Read ADC value according to external cable or button */
	ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
	if (ret) {
	dev_err(info->dev, "failed to read ADC register\n");
	return ret;
	}

	/*
	* If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
	* connected with to MUIC device.
	*/
	cable_type = adc & SM5502_REG_ADC_MASK;
	if (cable_type == SM5502_MUIC_ADC_GROUND)
	return SM5502_MUIC_ADC_GROUND;

	switch (cable_type) {
	case SM5502_MUIC_ADC_GROUND:
	case SM5502_MUIC_ADC_SEND_END_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
	case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
	case SM5502_MUIC_ADC_RESERVED_ACC_1:
	case SM5502_MUIC_ADC_RESERVED_ACC_2:
	case SM5502_MUIC_ADC_RESERVED_ACC_3:
	case SM5502_MUIC_ADC_RESERVED_ACC_4:
	case SM5502_MUIC_ADC_RESERVED_ACC_5:
	case SM5502_MUIC_ADC_AUDIO_TYPE2:
	case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
	case SM5502_MUIC_ADC_TTY_CONVERTER:
	case SM5502_MUIC_ADC_UART_CABLE:
	case SM5502_MUIC_ADC_TYPE1_CHARGER:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
	case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
	case SM5502_MUIC_ADC_TYPE2_CHARGER:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
	case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
	break;
	case SM5502_MUIC_ADC_AUDIO_TYPE1:
	/*
	* Check whether cable type is
	* SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
	* or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
	* by using Button event.
	*/
	break;
	case SM5502_MUIC_ADC_OPEN:
	ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
	&dev_type1);
	if (ret) {
	dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
	return ret;
	}

	switch (dev_type1) {
	case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
	cable_type = SM5502_MUIC_ADC_OPEN_USB;
	break;
	case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
	cable_type = SM5502_MUIC_ADC_OPEN_TA;
	break;
	case SM5502_REG_DEV_TYPE1_USB_OTG_MASK:
	cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
	break;
	default:
	dev_dbg(info->dev,
	"cannot identify the cable type: adc(0x%x) "
	"dev_type1(0x%x)\n", adc, dev_type1);
	return -EINVAL;
	};
	break;
	default:
	dev_err(info->dev,
	"failed to identify the cable type: adc(0x%x)\n", adc);
	return -EINVAL;
	};

	return cable_type;
	}

	static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
	bool attached)
	{
	static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
	const char **cable_names = info->edev->supported_cable;
	unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
	unsigned int con_sw = DM_DP_SWITCH_OPEN;
	unsigned int vbus_sw = VBUSIN_SWITCH_OPEN;
	unsigned int idx = 0;
	int ret;

	if (!cable_names)
	return 0;

	/* Get the type of attached or detached cable */
	if (attached)
	cable_type = sm5502_muic_get_cable_type(info);
	else
	cable_type = prev_cable_type;
	prev_cable_type = cable_type;

	switch (cable_type) {
	case SM5502_MUIC_ADC_OPEN_USB:
	idx = EXTCON_CABLE_USB;
	con_sw = DM_DP_SWITCH_USB;
	vbus_sw = VBUSIN_SWITCH_VBUSOUT_WITH_USB;
	break;
	case SM5502_MUIC_ADC_OPEN_TA:
	idx = EXTCON_CABLE_TA;
	con_sw = DM_DP_SWITCH_OPEN;
	vbus_sw = VBUSIN_SWITCH_VBUSOUT;
	break;
	case SM5502_MUIC_ADC_OPEN_USB_OTG:
	idx = EXTCON_CABLE_USB_HOST;
	con_sw = DM_DP_SWITCH_USB;
	vbus_sw = VBUSIN_SWITCH_OPEN;
	break;
	default:
	dev_dbg(info->dev,
	"cannot handle this cable_type (0x%x)\n", cable_type);
	return 0;
	};

	/* Change internal hardware path(DM_CON/DP_CON, VBUSIN) */
	ret = sm5502_muic_set_path(info, con_sw, vbus_sw, attached);
	if (ret < 0)
	return ret;

	/* Change the state of external accessory */
	extcon_set_cable_state(info->edev, cable_names[idx], attached);

	return 0;
	}

	static void sm5502_muic_irq_work(struct work_struct *work)
	{
	struct sm5502_muic_info *info = container_of(work,
	struct sm5502_muic_info, irq_work);
	int ret = 0;

	if (!info->edev)
	return;

	mutex_lock(&info->mutex);

	/* Detect attached or detached cables */
	if (info->irq_attach) {
	ret = sm5502_muic_cable_handler(info, true);
	info->irq_attach = false;
	}
	if (info->irq_detach) {
	ret = sm5502_muic_cable_handler(info, false);
	info->irq_detach = false;
	}

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

	mutex_unlock(&info->mutex);
	}

	/*
	* Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
	* Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
	*/
	static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
	{
	switch (irq_type) {
	case SM5502_IRQ_INT1_ATTACH:
	info->irq_attach = true;
	break;
	case SM5502_IRQ_INT1_DETACH:
	info->irq_detach = true;
	break;
	case SM5502_IRQ_INT1_KP:
	case SM5502_IRQ_INT1_LKP:
	case SM5502_IRQ_INT1_LKR:
	case SM5502_IRQ_INT1_OVP_EVENT:
	case SM5502_IRQ_INT1_OCP_EVENT:
	case SM5502_IRQ_INT1_OVP_OCP_DIS:
	case SM5502_IRQ_INT2_VBUS_DET:
	case SM5502_IRQ_INT2_REV_ACCE:
	case SM5502_IRQ_INT2_ADC_CHG:
	case SM5502_IRQ_INT2_STUCK_KEY:
	case SM5502_IRQ_INT2_STUCK_KEY_RCV:
	case SM5502_IRQ_INT2_MHL:
	default:
	break;
	}

	return 0;
	}

	static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
	{
	struct sm5502_muic_info *info = data;
	int i, irq_type = -1, ret;

	for (i = 0; i < info->num_muic_irqs; i++)
	if (irq == info->muic_irqs[i].virq)
	irq_type = info->muic_irqs[i].irq;

	ret = sm5502_parse_irq(info, irq_type);
	if (ret < 0) {
	dev_warn(info->dev, "cannot handle is interrupt:%d\n",
	irq_type);
	return IRQ_HANDLED;
	}
	schedule_work(&info->irq_work);

	return IRQ_HANDLED;
	}

	static void sm5502_muic_detect_cable_wq(struct work_struct *work)
	{
	struct sm5502_muic_info *info = container_of(to_delayed_work(work),
	struct sm5502_muic_info, wq_detcable);
	int ret;

	/* Notify the state of connector cable or not */
	ret = sm5502_muic_cable_handler(info, true);
	if (ret < 0)
	dev_warn(info->dev, "failed to detect cable state\n");
	}

	static void sm5502_init_dev_type(struct sm5502_muic_info *info)
	{
	unsigned int reg_data, vendor_id, version_id;
	int i, ret;

	/* To test I2C, Print version_id and vendor_id of SM5502 */
	ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
	if (ret) {
	dev_err(info->dev,
	"failed to read DEVICE_ID register: %d\n", ret);
	return;
	}

	vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
	SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
	version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
	SM5502_REG_DEVICE_ID_VERSION_SHIFT);

	dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
	version_id, vendor_id);

	/* Initiazle the register of SM5502 device to bring-up */
	for (i = 0; i < info->num_reg_data; i++) {
	unsigned int val = 0;

	if (!info->reg_data[i].invert)
	val \|= ~info->reg_data[i].val;
	else
	val = info->reg_data[i].val;
	regmap_write(info->regmap, info->reg_data[i].reg, val);
	}
	}

	static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct device_node *np = i2c->dev.of_node;
	struct sm5502_muic_info *info;
	int i, ret, irq_flags;

	if (!np)
	return -EINVAL;

	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;
	i2c_set_clientdata(i2c, info);

	info->dev = &i2c->dev;
	info->i2c = i2c;
	info->irq = i2c->irq;
	info->muic_irqs = sm5502_muic_irqs;
	info->num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs);
	info->reg_data = sm5502_reg_data;
	info->num_reg_data = ARRAY_SIZE(sm5502_reg_data);

	mutex_init(&info->mutex);

	INIT_WORK(&info->irq_work, sm5502_muic_irq_work);

	info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
	if (IS_ERR(info->regmap)) {
	ret = PTR_ERR(info->regmap);
	dev_err(info->dev, "failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	/* Support irq domain for SM5502 MUIC device */
	irq_flags = IRQF_TRIGGER_FALLING \| IRQF_ONESHOT \| IRQF_SHARED;
	ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
	&sm5502_muic_irq_chip, &info->irq_data);
	if (ret != 0) {
	dev_err(info->dev, "failed to request IRQ %d: %d\n",
	info->irq, ret);
	return ret;
	}

	for (i = 0; i < info->num_muic_irqs; i++) {
	struct muic_irq *muic_irq = &info->muic_irqs[i];
	unsigned int virq = 0;

	virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
	if (virq <= 0)
	return -EINVAL;
	muic_irq->virq = virq;

	ret = devm_request_threaded_irq(info->dev, virq, NULL,
	sm5502_muic_irq_handler,
	IRQF_NO_SUSPEND,
	muic_irq->name, info);
	if (ret) {
	dev_err(info->dev,
	"failed: irq request (IRQ: %d, error :%d)\n",
	muic_irq->irq, ret);
	return ret;
	}
	}

	/* Allocate extcon device */
	info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
	if (IS_ERR(info->edev)) {
	dev_err(info->dev, "failed to allocate memory for extcon\n");
	return -ENOMEM;
	}
	info->edev->name = np->name;

	/* Register extcon device */
	ret = devm_extcon_dev_register(info->dev, info->edev);
	if (ret) {
	dev_err(info->dev, "failed to register extcon device\n");
	return ret;
	}

	/*
	* 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, sm5502_muic_detect_cable_wq);
	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
	msecs_to_jiffies(DELAY_MS_DEFAULT));

	/* Initialize SM5502 device and print vendor id and version id */
	sm5502_init_dev_type(info);

	return 0;
	}

	static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
	{
	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

	regmap_del_irq_chip(info->irq, info->irq_data);

	return 0;
	}

	static struct of_device_id sm5502_dt_match[] = {
	{ .compatible = "siliconmitus,sm5502-muic" },
	{ },
	};

	#ifdef CONFIG_PM_SLEEP
	static int sm5502_muic_suspend(struct device *dev)
	{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

	enable_irq_wake(info->irq);

	return 0;
	}

	static int sm5502_muic_resume(struct device *dev)
	{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct sm5502_muic_info *info = i2c_get_clientdata(i2c);

	disable_irq_wake(info->irq);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
	sm5502_muic_suspend, sm5502_muic_resume);

	static const struct i2c_device_id sm5502_i2c_id[] = {
	{ "sm5502", TYPE_SM5502 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);

	static struct i2c_driver sm5502_muic_i2c_driver = {
	.driver = {
	.name = "sm5502",
	.owner = THIS_MODULE,
	.pm = &sm5502_muic_pm_ops,
	.of_match_table = sm5502_dt_match,
	},
	.probe = sm5022_muic_i2c_probe,
	.remove = sm5502_muic_i2c_remove,
	.id_table = sm5502_i2c_id,
	};

	static int __init sm5502_muic_i2c_init(void)
	{
	return i2c_add_driver(&sm5502_muic_i2c_driver);
	}
	subsys_initcall(sm5502_muic_i2c_init);

	MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
	MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
	MODULE_LICENSE("GPL");