/*
 * extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC
 *
 * Copyright (C) 2012 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/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/extcon.h>
#include <linux/regmap.h>
#include <linux/irqdomain.h>

#define DEV_NAME                        "max77693-muic"
#define DELAY_MS_DEFAULT                20000           /* unit: millisecond */

/*
 * Default value of MAX77693 register to bring up MUIC device.
 * If user don't set some initial value for MUIC device through platform data,
 * extcon-max77693 driver use 'default_init_data' to bring up base operation
 * of MAX77693 MUIC device.
 */
static struct max77693_reg_data default_init_data[] = {
        {
                /* STATUS2 - [3]ChgDetRun */
                .addr = MAX77693_MUIC_REG_STATUS2,
                .data = STATUS2_CHGDETRUN_MASK,
        }, {
                /* INTMASK1 - Unmask [3]ADC1KM,[0]ADCM */
                .addr = MAX77693_MUIC_REG_INTMASK1,
                .data = INTMASK1_ADC1K_MASK
                        | INTMASK1_ADC_MASK,
        }, {
                /* INTMASK2 - Unmask [0]ChgTypM */
                .addr = MAX77693_MUIC_REG_INTMASK2,
                .data = INTMASK2_CHGTYP_MASK,
        }, {
                /* INTMASK3 - Mask all of interrupts */
                .addr = MAX77693_MUIC_REG_INTMASK3,
                .data = 0x0,
        }, {
                /* CDETCTRL2 */
                .addr = MAX77693_MUIC_REG_CDETCTRL2,
                .data = CDETCTRL2_VIDRMEN_MASK
                        | CDETCTRL2_DXOVPEN_MASK,
        },
};

enum max77693_muic_adc_debounce_time {
        ADC_DEBOUNCE_TIME_5MS = 0,
        ADC_DEBOUNCE_TIME_10MS,
        ADC_DEBOUNCE_TIME_25MS,
        ADC_DEBOUNCE_TIME_38_62MS,
};

struct max77693_muic_info {
        struct device *dev;
        struct max77693_dev *max77693;
        struct extcon_dev *edev;
        int prev_cable_type;
        int prev_cable_type_gnd;
        int prev_chg_type;
        int prev_button_type;
        u8 status[2];

        int irq;
        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;

        /* Button of dock device */
        struct input_dev *dock;

        /*
         * 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 max77693_muic_cable_group {
        MAX77693_CABLE_GROUP_ADC = 0,
        MAX77693_CABLE_GROUP_ADC_GND,
        MAX77693_CABLE_GROUP_CHG,
        MAX77693_CABLE_GROUP_VBVOLT,
};

enum max77693_muic_charger_type {
        MAX77693_CHARGER_TYPE_NONE = 0,
        MAX77693_CHARGER_TYPE_USB,
        MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT,
        MAX77693_CHARGER_TYPE_DEDICATED_CHG,
        MAX77693_CHARGER_TYPE_APPLE_500MA,
        MAX77693_CHARGER_TYPE_APPLE_1A_2A,
        MAX77693_CHARGER_TYPE_DEAD_BATTERY = 7,
};

/**
 * struct max77693_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 max77693_muic_irq {
        unsigned int irq;
        const char *name;
        unsigned int virq;
};

static struct max77693_muic_irq muic_irqs[] = {
        { MAX77693_MUIC_IRQ_INT1_ADC,           "muic-ADC" },
        { MAX77693_MUIC_IRQ_INT1_ADC_LOW,       "muic-ADCLOW" },
        { MAX77693_MUIC_IRQ_INT1_ADC_ERR,       "muic-ADCError" },
        { MAX77693_MUIC_IRQ_INT1_ADC1K,         "muic-ADC1K" },
        { MAX77693_MUIC_IRQ_INT2_CHGTYP,        "muic-CHGTYP" },
        { MAX77693_MUIC_IRQ_INT2_CHGDETREUN,    "muic-CHGDETREUN" },
        { MAX77693_MUIC_IRQ_INT2_DCDTMR,        "muic-DCDTMR" },
        { MAX77693_MUIC_IRQ_INT2_DXOVP,         "muic-DXOVP" },
        { MAX77693_MUIC_IRQ_INT2_VBVOLT,        "muic-VBVOLT" },
        { MAX77693_MUIC_IRQ_INT2_VIDRM,         "muic-VIDRM" },
        { MAX77693_MUIC_IRQ_INT3_EOC,           "muic-EOC" },
        { MAX77693_MUIC_IRQ_INT3_CGMBC,         "muic-CGMBC" },
        { MAX77693_MUIC_IRQ_INT3_OVP,           "muic-OVP" },
        { MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR,    "muic-MBCCHG_ERR" },
        { MAX77693_MUIC_IRQ_INT3_CHG_ENABLED,   "muic-CHG_ENABLED" },
        { MAX77693_MUIC_IRQ_INT3_BAT_DET,       "muic-BAT_DET" },
};

/* Define supported accessory type */
enum max77693_muic_acc_type {
        MAX77693_MUIC_ADC_GROUND = 0x0,
        MAX77693_MUIC_ADC_SEND_END_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S1_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S2_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S3_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S4_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S5_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S6_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S7_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S8_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S9_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S10_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S11_BUTTON,
        MAX77693_MUIC_ADC_REMOTE_S12_BUTTON,
        MAX77693_MUIC_ADC_RESERVED_ACC_1,
        MAX77693_MUIC_ADC_RESERVED_ACC_2,
        MAX77693_MUIC_ADC_RESERVED_ACC_3,
        MAX77693_MUIC_ADC_RESERVED_ACC_4,
        MAX77693_MUIC_ADC_RESERVED_ACC_5,
        MAX77693_MUIC_ADC_CEA936_AUDIO,
        MAX77693_MUIC_ADC_PHONE_POWERED_DEV,
        MAX77693_MUIC_ADC_TTY_CONVERTER,
        MAX77693_MUIC_ADC_UART_CABLE,
        MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG,
        MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF,
        MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON,
        MAX77693_MUIC_ADC_AV_CABLE_NOLOAD,
        MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG,
        MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF,
        MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON,
        MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE,
        MAX77693_MUIC_ADC_OPEN,

        /* The below accessories have same ADC value so ADCLow and
           ADC1K bit is used to separate specific accessory */
        MAX77693_MUIC_GND_USB_OTG = 0x100,      /* ADC:0x0, VBVolot:0, ADCLow:0, ADC1K:0 */
        MAX77693_MUIC_GND_USB_OTG_VB = 0x104,   /* ADC:0x0, VBVolot:1, ADCLow:0, ADC1K:0 */
        MAX77693_MUIC_GND_AV_CABLE_LOAD = 0x102,/* ADC:0x0, VBVolot:0, ADCLow:1, ADC1K:0 */
        MAX77693_MUIC_GND_MHL = 0x103,          /* ADC:0x0, VBVolot:0, ADCLow:1, ADC1K:1 */
        MAX77693_MUIC_GND_MHL_VB = 0x107,       /* ADC:0x0, VBVolot:1, ADCLow:1, ADC1K:1 */
};

/* MAX77693 MUIC device support below list of accessories(external connector) */
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_MHL_TA,
        EXTCON_CABLE_JIG_USB_ON,
        EXTCON_CABLE_JIG_USB_OFF,
        EXTCON_CABLE_JIG_UART_OFF,
        EXTCON_CABLE_JIG_UART_ON,
        EXTCON_CABLE_DOCK_SMART,
        EXTCON_CABLE_DOCK_DESK,
        EXTCON_CABLE_DOCK_AUDIO,

        _EXTCON_CABLE_NUM,
};

static const char *max77693_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_MHL_TA]                   = "MHL_TA",
        [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]              = "Dock-Car",
        [EXTCON_CABLE_DOCK_SMART]               = "Dock-Smart",
        [EXTCON_CABLE_DOCK_DESK]                = "Dock-Desk",
        [EXTCON_CABLE_DOCK_AUDIO]               = "Dock-Audio",

        NULL,
};

/*
 * max77693_muic_set_debounce_time - Set the debounce time of ADC
 * @info: the instance including private data of max77693 MUIC
 * @time: the debounce time of ADC
 */
static int max77693_muic_set_debounce_time(struct max77693_muic_info *info,
                enum max77693_muic_adc_debounce_time time)
{
        int 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 = max77693_update_reg(info->max77693->regmap_muic,
                                          MAX77693_MUIC_REG_CTRL3,
                                          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;
};

/*
 * max77693_muic_set_path - Set hardware line according to attached cable
 * @info: the instance including private data of max77693 MUIC
 * @value: the path according to attached cable
 * @attached: the state of cable (true:attached, false:detached)
 *
 * The max77693 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 max77693_muic_set_path(struct max77693_muic_info *info,
                u8 val, bool attached)
{
        int ret = 0;
        u8 ctrl1, ctrl2 = 0;

        if (attached)
                ctrl1 = val;
        else
                ctrl1 = CONTROL1_SW_OPEN;

        ret = max77693_update_reg(info->max77693->regmap_muic,
                        MAX77693_MUIC_REG_CTRL1, 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 = max77693_update_reg(info->max77693->regmap_muic,
                        MAX77693_MUIC_REG_CTRL2, 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;
}

/*
 * max77693_muic_get_cable_type - Return cable type and check cable state
 * @info: the instance including private data of max77693 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.
 *      - MAX77693_CABLE_GROUP_ADC
 *      - MAX77693_CABLE_GROUP_ADC_GND
 *      - MAX77693_CABLE_GROUP_CHG
 *      - MAX77693_CABLE_GROUP_VBVOLT
 */
static int max77693_muic_get_cable_type(struct max77693_muic_info *info,
                enum max77693_muic_cable_group group, bool *attached)
{
        int cable_type = 0;
        int adc;
        int adc1k;
        int adclow;
        int vbvolt;
        int chg_type;

        switch (group) {
        case MAX77693_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 == MAX77693_MUIC_ADC_OPEN) {
                        *attached = false;

                        cable_type = info->prev_cable_type;
                        info->prev_cable_type = MAX77693_MUIC_ADC_OPEN;
                } else {
                        *attached = true;

                        cable_type = info->prev_cable_type = adc;
                }
                break;
        case MAX77693_CABLE_GROUP_ADC_GND:
                /*
                 * 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/_gnd) for handling cable when cable
                 * is detached.
                 */
                if (adc == MAX77693_MUIC_ADC_OPEN) {
                        *attached = false;

                        cable_type = info->prev_cable_type_gnd;
                        info->prev_cable_type_gnd = MAX77693_MUIC_ADC_OPEN;
                } else {
                        *attached = true;

                        adclow = info->status[0] & STATUS1_ADCLOW_MASK;
                        adclow >>= STATUS1_ADCLOW_SHIFT;
                        adc1k = info->status[0] & STATUS1_ADC1K_MASK;
                        adc1k >>= STATUS1_ADC1K_SHIFT;

                        vbvolt = info->status[1] & STATUS2_VBVOLT_MASK;
                        vbvolt >>= STATUS2_VBVOLT_SHIFT;

                        /**
                         * [0x1][VBVolt][ADCLow][ADC1K]
                         * [0x1    0       0       0  ] : USB_OTG
                         * [0x1    1       0       0  ] : USB_OTG_VB
                         * [0x1    0       1       0  ] : Audio Video Cable with load
                         * [0x1    0       1       1  ] : MHL without charging connector
                         * [0x1    1       1       1  ] : MHL with charging connector
                         */
                        cable_type = ((0x1 << 8)
                                        | (vbvolt << 2)
                                        | (adclow << 1)
                                        | adc1k);

                        info->prev_cable_type = adc;
                        info->prev_cable_type_gnd = cable_type;
                }

                break;
        case MAX77693_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 == MAX77693_CHARGER_TYPE_NONE) {
                        *attached = false;

                        cable_type = info->prev_chg_type;
                        info->prev_chg_type = MAX77693_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;
        case MAX77693_CABLE_GROUP_VBVOLT:
                /*
                 * 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;
                chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
                chg_type >>= STATUS2_CHGTYP_SHIFT;

                if (adc == MAX77693_MUIC_ADC_OPEN
                                && chg_type == MAX77693_CHARGER_TYPE_NONE)
                        *attached = false;
                else
                        *attached = true;

                /*
                 * Read vbvolt field, if vbvolt is 1,
                 * this cable is used for charging.
                 */
                vbvolt = info->status[1] & STATUS2_VBVOLT_MASK;
                vbvolt >>= STATUS2_VBVOLT_SHIFT;

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

        return cable_type;
}

static int max77693_muic_dock_handler(struct max77693_muic_info *info,
                int cable_type, bool attached)
{
        int ret = 0;
        int vbvolt;
        bool cable_attached;
        char dock_name[CABLE_NAME_MAX];

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

        switch (cable_type) {
        case MAX77693_MUIC_ADC_RESERVED_ACC_3:          /* Dock-Smart */
                /*
                 * Check power cable whether attached or detached state.
                 * The Dock-Smart device need surely external power supply.
                 * If power cable(USB/TA) isn't connected to Dock device,
                 * user can't use Dock-Smart for desktop mode.
                 */
                vbvolt = max77693_muic_get_cable_type(info,
                                MAX77693_CABLE_GROUP_VBVOLT, &cable_attached);
                if (attached && !vbvolt) {
                        dev_warn(info->dev,
                                "Cannot detect external power supply\n");
                        return 0;
                }

                /*
                 * Notify Dock-Smart/MHL state.
                 * - Dock-Smart device include three type of cable which
                 * are HDMI, USB for mouse/keyboard and micro-usb port
                 * for USB/TA cable. Dock-Smart device need always exteranl
                 * power supply(USB/TA cable through micro-usb cable). Dock-
                 * Smart device support screen output of target to separate
                 * monitor and mouse/keyboard for desktop mode.
                 *
                 * Features of 'USB/TA cable with Dock-Smart device'
                 * - Support MHL
                 * - Support external output feature of audio
                 * - Support charging through micro-usb port without data
                 *           connection if TA cable is connected to target.
                 * - Support charging and data connection through micro-usb port
                 *           if USB cable is connected between target and host
                 *           device.
                 * - Support OTG device (Mouse/Keyboard)
                 */
                ret = max77693_muic_set_path(info, info->path_usb, attached);
                if (ret < 0)
                        return ret;

                extcon_set_cable_state(info->edev, "Dock-Smart", attached);
                extcon_set_cable_state(info->edev, "MHL", attached);
                goto out;
        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:    /* Dock-Car */
                strcpy(dock_name, "Dock-Car");
                break;
        case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:       /* Dock-Desk */
                strcpy(dock_name, "Dock-Desk");
                break;
        case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:         /* Dock-Audio */
                strcpy(dock_name, "Dock-Audio");
                if (!attached)
                        extcon_set_cable_state(info->edev, "USB", false);
                break;
        default:
                dev_err(info->dev, "failed to detect %s dock device\n",
                        attached ? "attached" : "detached");
                return -EINVAL;
        }

        /* Dock-Car/Desk/Audio, PATH:AUDIO */
        ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
        if (ret < 0)
                return ret;
        extcon_set_cable_state(info->edev, dock_name, attached);

out:
        return 0;
}

static int max77693_muic_dock_button_handler(struct max77693_muic_info *info,
                int button_type, bool attached)
{
        struct input_dev *dock = info->dock;
        unsigned int code;

        switch (button_type) {
        case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON-1
                ... MAX77693_MUIC_ADC_REMOTE_S3_BUTTON+1:
                /* DOCK_KEY_PREV */
                code = KEY_PREVIOUSSONG;
                break;
        case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON-1
                ... MAX77693_MUIC_ADC_REMOTE_S7_BUTTON+1:
                /* DOCK_KEY_NEXT */
                code = KEY_NEXTSONG;
                break;
        case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:
                /* DOCK_VOL_DOWN */
                code = KEY_VOLUMEDOWN;
                break;
        case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:
                /* DOCK_VOL_UP */
                code = KEY_VOLUMEUP;
                break;
        case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON-1
                ... MAX77693_MUIC_ADC_REMOTE_S12_BUTTON+1:
                /* DOCK_KEY_PLAY_PAUSE */
                code = KEY_PLAYPAUSE;
                break;
        default:
                dev_err(info->dev,
                        "failed to detect %s key (adc:0x%x)\n",
                        attached ? "pressed" : "released", button_type);
                return -EINVAL;
        }

        input_event(dock, EV_KEY, code, attached);
        input_sync(dock);

        return 0;
}

static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)
{
        int cable_type_gnd;
        int ret = 0;
        bool attached;

        cable_type_gnd = max77693_muic_get_cable_type(info,
                                MAX77693_CABLE_GROUP_ADC_GND, &attached);

        switch (cable_type_gnd) {
        case MAX77693_MUIC_GND_USB_OTG:
        case MAX77693_MUIC_GND_USB_OTG_VB:
                /* USB_OTG, PATH: AP_USB */
                ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
                if (ret < 0)
                        return ret;
                extcon_set_cable_state(info->edev, "USB-Host", attached);
                break;
        case MAX77693_MUIC_GND_AV_CABLE_LOAD:
                /* Audio Video Cable with load, PATH:AUDIO */
                ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
                if (ret < 0)
                        return ret;
                extcon_set_cable_state(info->edev,
                                "Audio-video-load", attached);
                break;
        case MAX77693_MUIC_GND_MHL:
        case MAX77693_MUIC_GND_MHL_VB:
                /* MHL or MHL with USB/TA cable */
                extcon_set_cable_state(info->edev, "MHL", attached);
                break;
        default:
                dev_err(info->dev, "failed to detect %s cable of gnd type\n",
                        attached ? "attached" : "detached");
                return -EINVAL;
        }

        return 0;
}

static int max77693_muic_jig_handler(struct max77693_muic_info *info,
                int cable_type, bool attached)
{
        char cable_name[32];
        int ret = 0;
        u8 path = CONTROL1_SW_OPEN;

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

        switch (cable_type) {
        case MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF:    /* ADC_JIG_USB_OFF */
                /* PATH:AP_USB */
                strcpy(cable_name, "JIG-USB-OFF");
                path = CONTROL1_SW_USB;
                break;
        case MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON:     /* ADC_JIG_USB_ON */
                /* PATH:AP_USB */
                strcpy(cable_name, "JIG-USB-ON");
                path = CONTROL1_SW_USB;
                break;
        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF:   /* ADC_JIG_UART_OFF */
                /* PATH:AP_UART */
                strcpy(cable_name, "JIG-UART-OFF");
                path = CONTROL1_SW_UART;
                break;
        default:
                dev_err(info->dev, "failed to detect %s jig cable\n",
                        attached ? "attached" : "detached");
                return -EINVAL;
        }

        ret = max77693_muic_set_path(info, path, attached);
        if (ret < 0)
                return ret;

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

        return 0;
}

static int max77693_muic_adc_handler(struct max77693_muic_info *info)
{
        int cable_type;
        int button_type;
        bool attached;
        int ret = 0;

        /* Check accessory state which is either detached or attached */
        cable_type = max77693_muic_get_cable_type(info,
                                MAX77693_CABLE_GROUP_ADC, &attached);

        dev_info(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 MAX77693_MUIC_ADC_GROUND:
                /* USB_OTG/MHL/Audio */
                max77693_muic_adc_ground_handler(info);
                break;
        case MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF:
        case MAX77693_MUIC_ADC_FACTORY_MODE_USB_ON:
        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF:
                /* JIG */
                ret = max77693_muic_jig_handler(info, cable_type, attached);
                if (ret < 0)
                        return ret;
                break;
        case MAX77693_MUIC_ADC_RESERVED_ACC_3:          /* Dock-Smart */
        case MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON:    /* Dock-Car */
        case MAX77693_MUIC_ADC_AUDIO_MODE_REMOTE:       /* Dock-Desk */
        case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:         /* Dock-Audio */
                /*
                 * DOCK device
                 *
                 * The MAX77693 MUIC device can detect total 34 cable type
                 * except of charger cable and MUIC device didn't define
                 * specfic role of cable in the range of from 0x01 to 0x12
                 * of ADC value. So, can use/define cable with no role according
                 * to schema of hardware board.
                 */
                ret = max77693_muic_dock_handler(info, cable_type, attached);
                if (ret < 0)
                        return ret;
                break;
        case MAX77693_MUIC_ADC_REMOTE_S3_BUTTON:        /* DOCK_KEY_PREV */
        case MAX77693_MUIC_ADC_REMOTE_S7_BUTTON:        /* DOCK_KEY_NEXT */
        case MAX77693_MUIC_ADC_REMOTE_S9_BUTTON:        /* DOCK_VOL_DOWN */
        case MAX77693_MUIC_ADC_REMOTE_S10_BUTTON:       /* DOCK_VOL_UP */
        case MAX77693_MUIC_ADC_REMOTE_S12_BUTTON:       /* DOCK_KEY_PLAY_PAUSE */
                /*
                 * Button of DOCK device
                 * - the Prev/Next/Volume Up/Volume Down/Play-Pause button
                 *
                 * The MAX77693 MUIC device can detect total 34 cable type
                 * except of charger cable and MUIC device didn't define
                 * specfic role of cable in the range of from 0x01 to 0x12
                 * of ADC value. So, can use/define cable with no role according
                 * to schema of hardware board.
                 */
                if (attached)
                        button_type = info->prev_button_type = cable_type;
                else
                        button_type = info->prev_button_type;

                ret = max77693_muic_dock_button_handler(info, button_type,
                                                        attached);
                if (ret < 0)
                        return ret;
                break;
        case MAX77693_MUIC_ADC_SEND_END_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S1_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S2_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S4_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S5_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S6_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S8_BUTTON:
        case MAX77693_MUIC_ADC_REMOTE_S11_BUTTON:
        case MAX77693_MUIC_ADC_RESERVED_ACC_1:
        case MAX77693_MUIC_ADC_RESERVED_ACC_2:
        case MAX77693_MUIC_ADC_RESERVED_ACC_4:
        case MAX77693_MUIC_ADC_RESERVED_ACC_5:
        case MAX77693_MUIC_ADC_CEA936_AUDIO:
        case MAX77693_MUIC_ADC_PHONE_POWERED_DEV:
        case MAX77693_MUIC_ADC_TTY_CONVERTER:
        case MAX77693_MUIC_ADC_UART_CABLE:
        case MAX77693_MUIC_ADC_CEA936A_TYPE1_CHG:
        case MAX77693_MUIC_ADC_CEA936A_TYPE2_CHG:
                /*
                 * 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 max77693_muic_chg_handler(struct max77693_muic_info *info)
{
        int chg_type;
        int cable_type_gnd;
        int cable_type;
        bool attached;
        bool cable_attached;
        int ret = 0;

        chg_type = max77693_muic_get_cable_type(info,
                                MAX77693_CABLE_GROUP_CHG, &attached);

        dev_info(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 MAX77693_CHARGER_TYPE_USB:
        case MAX77693_CHARGER_TYPE_DEDICATED_CHG:
        case MAX77693_CHARGER_TYPE_NONE:
                /* Check MAX77693_CABLE_GROUP_ADC_GND type */
                cable_type_gnd = max77693_muic_get_cable_type(info,
                                        MAX77693_CABLE_GROUP_ADC_GND,
                                        &cable_attached);
                switch (cable_type_gnd) {
                case MAX77693_MUIC_GND_MHL:
                case MAX77693_MUIC_GND_MHL_VB:
                        /*
                         * MHL cable with MHL_TA(USB/TA) cable
                         * - MHL cable include two port(HDMI line and separate micro-
                         * usb port. When the target connect MHL cable, extcon driver
                         * check whether MHL_TA(USB/TA) cable is connected. If MHL_TA
                         * cable is connected, extcon driver notify state to notifiee
                         * for charging battery.
                         *
                         * Features of 'MHL_TA(USB/TA) with MHL cable'
                         * - Support MHL
                         * - Support charging through micro-usb port without data connection
                         */
                        extcon_set_cable_state(info->edev, "MHL_TA", attached);
                        if (!cable_attached)
                                extcon_set_cable_state(info->edev, "MHL", cable_attached);
                        break;
                }

                /* Check MAX77693_CABLE_GROUP_ADC type */
                cable_type = max77693_muic_get_cable_type(info,
                                        MAX77693_CABLE_GROUP_ADC,
                                        &cable_attached);
                switch (cable_type) {
                case MAX77693_MUIC_ADC_AV_CABLE_NOLOAD:         /* Dock-Audio */
                        /*
                         * Dock-Audio device with USB/TA cable
                         * - Dock device include two port(Dock-Audio and micro-usb
                         * port). When the target connect Dock-Audio device, extcon
                         * driver check whether USB/TA cable is connected. If USB/TA
                         * cable is connected, extcon driver notify state to notifiee
                         * for charging battery.
                         *
                         * Features of 'USB/TA cable with Dock-Audio device'
                         * - Support external output feature of audio.
                         * - Support charging through micro-usb port without data
                         *           connection.
                         */
                        extcon_set_cable_state(info->edev, "USB", attached);

                        if (!cable_attached)
                                extcon_set_cable_state(info->edev, "Dock-Audio", cable_attached);
                        break;
                case MAX77693_MUIC_ADC_RESERVED_ACC_3:          /* Dock-Smart */
                        /*
                         * Dock-Smart device with USB/TA cable
                         * - Dock-Desk device include three type of cable which
                         * are HDMI, USB for mouse/keyboard and micro-usb port
                         * for USB/TA cable. Dock-Smart device need always exteranl
                         * power supply(USB/TA cable through micro-usb cable). Dock-
                         * Smart device support screen output of target to separate
                         * monitor and mouse/keyboard for desktop mode.
                         *
                         * Features of 'USB/TA cable with Dock-Smart device'
                         * - Support MHL
                         * - Support external output feature of audio
                         * - Support charging through micro-usb port without data
                         *           connection if TA cable is connected to target.
                         * - Support charging and data connection through micro-usb port
                         *           if USB cable is connected between target and host
                         *           device.
                         * - Support OTG device (Mouse/Keyboard)
                         */
                        ret = max77693_muic_set_path(info, info->path_usb, attached);
                        if (ret < 0)
                                return ret;

                        extcon_set_cable_state(info->edev, "Dock-Smart", attached);
                        extcon_set_cable_state(info->edev, "MHL", attached);

                        break;
                }

                /* Check MAX77693_CABLE_GROUP_CHG type */
                switch (chg_type) {
                case MAX77693_CHARGER_TYPE_NONE:
                        /*
                         * When MHL(with USB/TA cable) or Dock-Audio with USB/TA cable
                         * is attached, muic device happen below two interrupt.
                         * - 'MAX77693_MUIC_IRQ_INT1_ADC' for detecting MHL/Dock-Audio.
                         * - 'MAX77693_MUIC_IRQ_INT2_CHGTYP' for detecting USB/TA cable
                         *   connected to MHL or Dock-Audio.
                         * Always, happen eariler MAX77693_MUIC_IRQ_INT1_ADC interrupt
                         * than MAX77693_MUIC_IRQ_INT2_CHGTYP interrupt.
                         *
                         * If user attach MHL (with USB/TA cable and immediately detach
                         * MHL with USB/TA cable before MAX77693_MUIC_IRQ_INT2_CHGTYP
                         * interrupt is happened, USB/TA cable remain connected state to
                         * target. But USB/TA cable isn't connected to target. The user
                         * be face with unusual action. So, driver should check this
                         * situation in spite of, that previous charger type is N/A.
                         */
                        break;
                case MAX77693_CHARGER_TYPE_USB:
                        /* Only USB cable, PATH:AP_USB */
                        ret = max77693_muic_set_path(info, info->path_usb, attached);
                        if (ret < 0)
                                return ret;

                        extcon_set_cable_state(info->edev, "USB", attached);
                        break;
                case MAX77693_CHARGER_TYPE_DEDICATED_CHG:
                        /* Only TA cable */
                        extcon_set_cable_state(info->edev, "TA", attached);
                        break;
                }
                break;
        case MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT:
                extcon_set_cable_state(info->edev,
                                "Charge-downstream", attached);
                break;
        case MAX77693_CHARGER_TYPE_APPLE_500MA:
                extcon_set_cable_state(info->edev, "Slow-charger", attached);
                break;
        case MAX77693_CHARGER_TYPE_APPLE_1A_2A:
                extcon_set_cable_state(info->edev, "Fast-charger", attached);
                break;
        case MAX77693_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 max77693_muic_irq_work(struct work_struct *work)
{
        struct max77693_muic_info *info = container_of(work,
                        struct max77693_muic_info, irq_work);
        int irq_type = -1;
        int i, ret = 0;

        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 = max77693_bulk_read(info->max77693->regmap_muic,
                        MAX77693_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 MAX77693_MUIC_IRQ_INT1_ADC:
        case MAX77693_MUIC_IRQ_INT1_ADC_LOW:
        case MAX77693_MUIC_IRQ_INT1_ADC_ERR:
        case MAX77693_MUIC_IRQ_INT1_ADC1K:
                /* Handle all of accessory except for
                   type of charger accessory */
                ret = max77693_muic_adc_handler(info);
                break;
        case MAX77693_MUIC_IRQ_INT2_CHGTYP:
        case MAX77693_MUIC_IRQ_INT2_CHGDETREUN:
        case MAX77693_MUIC_IRQ_INT2_DCDTMR:
        case MAX77693_MUIC_IRQ_INT2_DXOVP:
        case MAX77693_MUIC_IRQ_INT2_VBVOLT:
        case MAX77693_MUIC_IRQ_INT2_VIDRM:
                /* Handle charger accessory */
                ret = max77693_muic_chg_handler(info);
                break;
        case MAX77693_MUIC_IRQ_INT3_EOC:
        case MAX77693_MUIC_IRQ_INT3_CGMBC:
        case MAX77693_MUIC_IRQ_INT3_OVP:
        case MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR:
        case MAX77693_MUIC_IRQ_INT3_CHG_ENABLED:
        case MAX77693_MUIC_IRQ_INT3_BAT_DET:
                break;
        default:
                dev_err(info->dev, "muic 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);

        return;
}

static irqreturn_t max77693_muic_irq_handler(int irq, void *data)
{
        struct max77693_muic_info *info = data;

        info->irq = irq;
        schedule_work(&info->irq_work);

        return IRQ_HANDLED;
}

static struct regmap_config max77693_muic_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
};

static int max77693_muic_detect_accessory(struct max77693_muic_info *info)
{
        int ret = 0;
        int adc;
        int chg_type;
        bool attached;

        mutex_lock(&info->mutex);

        /* Read STATUSx register to detect accessory */
        ret = max77693_bulk_read(info->max77693->regmap_muic,
                        MAX77693_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 = max77693_muic_get_cable_type(info, MAX77693_CABLE_GROUP_ADC,
                                        &attached);
        if (attached && adc != MAX77693_MUIC_ADC_OPEN) {
                ret = max77693_muic_adc_handler(info);
                if (ret < 0) {
                        dev_err(info->dev, "Cannot detect accessory\n");
                        mutex_unlock(&info->mutex);
                        return ret;
                }
        }

        chg_type = max77693_muic_get_cable_type(info, MAX77693_CABLE_GROUP_CHG,
                                        &attached);
        if (attached && chg_type != MAX77693_CHARGER_TYPE_NONE) {
                ret = max77693_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 max77693_muic_detect_cable_wq(struct work_struct *work)
{
        struct max77693_muic_info *info = container_of(to_delayed_work(work),
                                struct max77693_muic_info, wq_detcable);

        max77693_muic_detect_accessory(info);
}

static int max77693_muic_probe(struct platform_device *pdev)
{
        struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
        struct max77693_platform_data *pdata = dev_get_platdata(max77693->dev);
        struct max77693_muic_info *info;
        struct max77693_reg_data *init_data;
        int num_init_data;
        int delay_jiffies;
        int ret;
        int i;
        u8 id;

        info = devm_kzalloc(&pdev->dev, sizeof(struct max77693_muic_info),
                                   GFP_KERNEL);
        if (!info) {
                dev_err(&pdev->dev, "failed to allocate memory\n");
                return -ENOMEM;
        }
        info->dev = &pdev->dev;
        info->max77693 = max77693;
        if (info->max77693->regmap_muic) {
                dev_dbg(&pdev->dev, "allocate register map\n");
        } else {
                info->max77693->regmap_muic = devm_regmap_init_i2c(
                                                info->max77693->muic,
                                                &max77693_muic_regmap_config);
                if (IS_ERR(info->max77693->regmap_muic)) {
                        ret = PTR_ERR(info->max77693->regmap_muic);
                        dev_err(max77693->dev,
                                "failed to allocate register map: %d\n", ret);
                        return ret;
                }
        }

        /* Register input device for button of dock device */
        info->dock = devm_input_allocate_device(&pdev->dev);
        if (!info->dock) {
                dev_err(&pdev->dev, "%s: failed to allocate input\n", __func__);
                return -ENOMEM;
        }
        info->dock->name = "max77693-muic/dock";
        info->dock->phys = "max77693-muic/extcon";
        info->dock->dev.parent = &pdev->dev;

        __set_bit(EV_REP, info->dock->evbit);

        input_set_capability(info->dock, EV_KEY, KEY_VOLUMEUP);
        input_set_capability(info->dock, EV_KEY, KEY_VOLUMEDOWN);
        input_set_capability(info->dock, EV_KEY, KEY_PLAYPAUSE);
        input_set_capability(info->dock, EV_KEY, KEY_PREVIOUSSONG);
        input_set_capability(info->dock, EV_KEY, KEY_NEXTSONG);

        ret = input_register_device(info->dock);
        if (ret < 0) {
                dev_err(&pdev->dev, "Cannot register input device error(%d)\n",
                                ret);
                return ret;
        }

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

        INIT_WORK(&info->irq_work, max77693_muic_irq_work);

        /* Support irq domain for MAX77693 MUIC device */
        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
                struct max77693_muic_irq *muic_irq = &muic_irqs[i];
                unsigned int virq = 0;

                virq = irq_create_mapping(max77693->irq_domain, muic_irq->irq);
                if (!virq) {
                        ret = -EINVAL;
                        goto err_irq;
                }
                muic_irq->virq = virq;

                ret = request_threaded_irq(virq, NULL,
                                max77693_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;
                }
        }

        /* Initialize extcon device */
        info->edev = devm_kzalloc(&pdev->dev, sizeof(struct extcon_dev),
                                  GFP_KERNEL);
        if (!info->edev) {
                dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
                ret = -ENOMEM;
                goto err_irq;
        }
        info->edev->name = DEV_NAME;
        info->edev->supported_cable = max77693_extcon_cable;
        ret = extcon_dev_register(info->edev, NULL);
        if (ret) {
                dev_err(&pdev->dev, "failed to register extcon device\n");
                goto err_irq;
        }


        /* Initialize MUIC register by using platform data or default data */
        if (pdata->muic_data) {
                init_data = pdata->muic_data->init_data;
                num_init_data = pdata->muic_data->num_init_data;
        } else {
                init_data = default_init_data;
                num_init_data = ARRAY_SIZE(default_init_data);
        }

        for (i = 0 ; i < num_init_data ; i++) {
                enum max77693_irq_source irq_src
                                = MAX77693_IRQ_GROUP_NR;

                max77693_write_reg(info->max77693->regmap_muic,
                                init_data[i].addr,
                                init_data[i].data);

                switch (init_data[i].addr) {
                case MAX77693_MUIC_REG_INTMASK1:
                        irq_src = MUIC_INT1;
                        break;
                case MAX77693_MUIC_REG_INTMASK2:
                        irq_src = MUIC_INT2;
                        break;
                case MAX77693_MUIC_REG_INTMASK3:
                        irq_src = MUIC_INT3;
                        break;
                }

                if (irq_src < MAX77693_IRQ_GROUP_NR)
                        info->max77693->irq_masks_cur[irq_src]
                                = init_data[i].data;
        }

        if (pdata->muic_data) {
                struct max77693_muic_platform_data *muic_pdata = pdata->muic_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_usb = CONTROL1_SW_USB;
                info->path_uart = CONTROL1_SW_UART;
                delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
        }

        /* Set initial path for UART */
         max77693_muic_set_path(info, info->path_uart, true);

        /* Check revision number of MUIC device*/
        ret = max77693_read_reg(info->max77693->regmap_muic,
                        MAX77693_MUIC_REG_ID, &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 */
        max77693_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, max77693_muic_detect_cable_wq);
        schedule_delayed_work(&info->wq_detcable, delay_jiffies);

        return ret;

err_extcon:
        extcon_dev_unregister(info->edev);
err_irq:
        while (--i >= 0)
                free_irq(muic_irqs[i].virq, info);
        return ret;
}

static int max77693_muic_remove(struct platform_device *pdev)
{
        struct max77693_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);
        input_unregister_device(info->dock);
        extcon_dev_unregister(info->edev);

        return 0;
}

static struct platform_driver max77693_muic_driver = {
        .driver         = {
                .name   = DEV_NAME,
                .owner  = THIS_MODULE,
        },
        .probe          = max77693_muic_probe,
        .remove         = max77693_muic_remove,
};

module_platform_driver(max77693_muic_driver);

MODULE_DESCRIPTION("Maxim MAX77693 Extcon driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:extcon-max77693");