linux/drivers/extcon/extcon-max8997.c
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   1/*
   2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
   3 *
   4 *  Copyright (C) 2012 Samsung Electronics
   5 *  Donggeun Kim <dg77.kim@samsung.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/i2c.h>
  21#include <linux/slab.h>
  22#include <linux/interrupt.h>
  23#include <linux/err.h>
  24#include <linux/platform_device.h>
  25#include <linux/kobject.h>
  26#include <linux/mfd/max8997.h>
  27#include <linux/mfd/max8997-private.h>
  28#include <linux/extcon.h>
  29#include <linux/irqdomain.h>
  30
  31#define DEV_NAME                        "max8997-muic"
  32#define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
  33
  34enum max8997_muic_adc_debounce_time {
  35        ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
  36        ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
  37        ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
  38        ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
  39};
  40
  41struct max8997_muic_irq {
  42        unsigned int irq;
  43        const char *name;
  44        unsigned int virq;
  45};
  46
  47static struct max8997_muic_irq muic_irqs[] = {
  48        { MAX8997_MUICIRQ_ADCError,     "muic-ADCERROR" },
  49        { MAX8997_MUICIRQ_ADCLow,       "muic-ADCLOW" },
  50        { MAX8997_MUICIRQ_ADC,          "muic-ADC" },
  51        { MAX8997_MUICIRQ_VBVolt,       "muic-VBVOLT" },
  52        { MAX8997_MUICIRQ_DBChg,        "muic-DBCHG" },
  53        { MAX8997_MUICIRQ_DCDTmr,       "muic-DCDTMR" },
  54        { MAX8997_MUICIRQ_ChgDetRun,    "muic-CHGDETRUN" },
  55        { MAX8997_MUICIRQ_ChgTyp,       "muic-CHGTYP" },
  56        { MAX8997_MUICIRQ_OVP,          "muic-OVP" },
  57};
  58
  59/* Define supported cable type */
  60enum max8997_muic_acc_type {
  61        MAX8997_MUIC_ADC_GROUND = 0x0,
  62        MAX8997_MUIC_ADC_MHL,                   /* MHL*/
  63        MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
  64        MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
  65        MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
  66        MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
  67        MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
  68        MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
  69        MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
  70        MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
  71        MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
  72        MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
  73        MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
  74        MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
  75        MAX8997_MUIC_ADC_RESERVED_ACC_1,
  76        MAX8997_MUIC_ADC_RESERVED_ACC_2,
  77        MAX8997_MUIC_ADC_RESERVED_ACC_3,
  78        MAX8997_MUIC_ADC_RESERVED_ACC_4,
  79        MAX8997_MUIC_ADC_RESERVED_ACC_5,
  80        MAX8997_MUIC_ADC_CEA936_AUDIO,
  81        MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
  82        MAX8997_MUIC_ADC_TTY_CONVERTER,
  83        MAX8997_MUIC_ADC_UART_CABLE,
  84        MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
  85        MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,  /* JIG-USB-OFF */
  86        MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,   /* JIG-USB-ON */
  87        MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,       /* DESKDOCK */
  88        MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
  89        MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
  90        MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,  /* CARDOCK */
  91        MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
  92        MAX8997_MUIC_ADC_OPEN,                  /* OPEN */
  93};
  94
  95enum max8997_muic_cable_group {
  96        MAX8997_CABLE_GROUP_ADC = 0,
  97        MAX8997_CABLE_GROUP_ADC_GND,
  98        MAX8997_CABLE_GROUP_CHG,
  99        MAX8997_CABLE_GROUP_VBVOLT,
 100};
 101
 102enum max8997_muic_usb_type {
 103        MAX8997_USB_HOST,
 104        MAX8997_USB_DEVICE,
 105};
 106
 107enum max8997_muic_charger_type {
 108        MAX8997_CHARGER_TYPE_NONE = 0,
 109        MAX8997_CHARGER_TYPE_USB,
 110        MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
 111        MAX8997_CHARGER_TYPE_DEDICATED_CHG,
 112        MAX8997_CHARGER_TYPE_500MA,
 113        MAX8997_CHARGER_TYPE_1A,
 114        MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
 115};
 116
 117struct max8997_muic_info {
 118        struct device *dev;
 119        struct i2c_client *muic;
 120        struct extcon_dev *edev;
 121        int prev_cable_type;
 122        int prev_chg_type;
 123        u8 status[2];
 124
 125        int irq;
 126        struct work_struct irq_work;
 127        struct mutex mutex;
 128
 129        struct max8997_muic_platform_data *muic_pdata;
 130        enum max8997_muic_charger_type pre_charger_type;
 131
 132        /*
 133         * Use delayed workqueue to detect cable state and then
 134         * notify cable state to notifiee/platform through uevent.
 135         * After completing the booting of platform, the extcon provider
 136         * driver should notify cable state to upper layer.
 137         */
 138        struct delayed_work wq_detcable;
 139
 140        /*
 141         * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 142         * h/w path of COMP2/COMN1 on CONTROL1 register.
 143         */
 144        int path_usb;
 145        int path_uart;
 146};
 147
 148static const unsigned int max8997_extcon_cable[] = {
 149        EXTCON_USB,
 150        EXTCON_USB_HOST,
 151        EXTCON_CHG_USB_SDP,
 152        EXTCON_CHG_USB_DCP,
 153        EXTCON_CHG_USB_FAST,
 154        EXTCON_CHG_USB_SLOW,
 155        EXTCON_CHG_USB_CDP,
 156        EXTCON_DISP_MHL,
 157        EXTCON_DOCK,
 158        EXTCON_JIG,
 159        EXTCON_NONE,
 160};
 161
 162/*
 163 * max8997_muic_set_debounce_time - Set the debounce time of ADC
 164 * @info: the instance including private data of max8997 MUIC
 165 * @time: the debounce time of ADC
 166 */
 167static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
 168                enum max8997_muic_adc_debounce_time time)
 169{
 170        int ret;
 171
 172        switch (time) {
 173        case ADC_DEBOUNCE_TIME_0_5MS:
 174        case ADC_DEBOUNCE_TIME_10MS:
 175        case ADC_DEBOUNCE_TIME_25MS:
 176        case ADC_DEBOUNCE_TIME_38_62MS:
 177                ret = max8997_update_reg(info->muic,
 178                                          MAX8997_MUIC_REG_CONTROL3,
 179                                          time << CONTROL3_ADCDBSET_SHIFT,
 180                                          CONTROL3_ADCDBSET_MASK);
 181                if (ret) {
 182                        dev_err(info->dev, "failed to set ADC debounce time\n");
 183                        return ret;
 184                }
 185                break;
 186        default:
 187                dev_err(info->dev, "invalid ADC debounce time\n");
 188                return -EINVAL;
 189        }
 190
 191        return 0;
 192};
 193
 194/*
 195 * max8997_muic_set_path - Set hardware line according to attached cable
 196 * @info: the instance including private data of max8997 MUIC
 197 * @value: the path according to attached cable
 198 * @attached: the state of cable (true:attached, false:detached)
 199 *
 200 * The max8997 MUIC device share outside H/W line among a varity of cables,
 201 * so this function set internal path of H/W line according to the type of
 202 * attached cable.
 203 */
 204static int max8997_muic_set_path(struct max8997_muic_info *info,
 205                u8 val, bool attached)
 206{
 207        int ret = 0;
 208        u8 ctrl1, ctrl2 = 0;
 209
 210        if (attached)
 211                ctrl1 = val;
 212        else
 213                ctrl1 = CONTROL1_SW_OPEN;
 214
 215        ret = max8997_update_reg(info->muic,
 216                        MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
 217        if (ret < 0) {
 218                dev_err(info->dev, "failed to update MUIC register\n");
 219                return ret;
 220        }
 221
 222        if (attached)
 223                ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
 224        else
 225                ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
 226
 227        ret = max8997_update_reg(info->muic,
 228                        MAX8997_MUIC_REG_CONTROL2, ctrl2,
 229                        CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
 230        if (ret < 0) {
 231                dev_err(info->dev, "failed to update MUIC register\n");
 232                return ret;
 233        }
 234
 235        dev_info(info->dev,
 236                "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 237                ctrl1, ctrl2, attached ? "attached" : "detached");
 238
 239        return 0;
 240}
 241
 242/*
 243 * max8997_muic_get_cable_type - Return cable type and check cable state
 244 * @info: the instance including private data of max8997 MUIC
 245 * @group: the path according to attached cable
 246 * @attached: store cable state and return
 247 *
 248 * This function check the cable state either attached or detached,
 249 * and then divide precise type of cable according to cable group.
 250 *      - MAX8997_CABLE_GROUP_ADC
 251 *      - MAX8997_CABLE_GROUP_CHG
 252 */
 253static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
 254                enum max8997_muic_cable_group group, bool *attached)
 255{
 256        int cable_type = 0;
 257        int adc;
 258        int chg_type;
 259
 260        switch (group) {
 261        case MAX8997_CABLE_GROUP_ADC:
 262                /*
 263                 * Read ADC value to check cable type and decide cable state
 264                 * according to cable type
 265                 */
 266                adc = info->status[0] & STATUS1_ADC_MASK;
 267                adc >>= STATUS1_ADC_SHIFT;
 268
 269                /*
 270                 * Check current cable state/cable type and store cable type
 271                 * (info->prev_cable_type) for handling cable when cable is
 272                 * detached.
 273                 */
 274                if (adc == MAX8997_MUIC_ADC_OPEN) {
 275                        *attached = false;
 276
 277                        cable_type = info->prev_cable_type;
 278                        info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
 279                } else {
 280                        *attached = true;
 281
 282                        cable_type = info->prev_cable_type = adc;
 283                }
 284                break;
 285        case MAX8997_CABLE_GROUP_CHG:
 286                /*
 287                 * Read charger type to check cable type and decide cable state
 288                 * according to type of charger cable.
 289                 */
 290                chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
 291                chg_type >>= STATUS2_CHGTYP_SHIFT;
 292
 293                if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
 294                        *attached = false;
 295
 296                        cable_type = info->prev_chg_type;
 297                        info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
 298                } else {
 299                        *attached = true;
 300
 301                        /*
 302                         * Check current cable state/cable type and store cable
 303                         * type(info->prev_chg_type) for handling cable when
 304                         * charger cable is detached.
 305                         */
 306                        cable_type = info->prev_chg_type = chg_type;
 307                }
 308
 309                break;
 310        default:
 311                dev_err(info->dev, "Unknown cable group (%d)\n", group);
 312                cable_type = -EINVAL;
 313                break;
 314        }
 315
 316        return cable_type;
 317}
 318
 319static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 320                        enum max8997_muic_usb_type usb_type, bool attached)
 321{
 322        int ret = 0;
 323
 324        if (usb_type == MAX8997_USB_HOST) {
 325                ret = max8997_muic_set_path(info, info->path_usb, attached);
 326                if (ret < 0) {
 327                        dev_err(info->dev, "failed to update muic register\n");
 328                        return ret;
 329                }
 330        }
 331
 332        switch (usb_type) {
 333        case MAX8997_USB_HOST:
 334                extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, attached);
 335                break;
 336        case MAX8997_USB_DEVICE:
 337                extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
 338                extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SDP,
 339                                        attached);
 340                break;
 341        default:
 342                dev_err(info->dev, "failed to detect %s usb cable\n",
 343                        attached ? "attached" : "detached");
 344                return -EINVAL;
 345        }
 346
 347        return 0;
 348}
 349
 350static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 351                        int cable_type, bool attached)
 352{
 353        int ret = 0;
 354
 355        ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 356        if (ret) {
 357                dev_err(info->dev, "failed to update muic register\n");
 358                return ret;
 359        }
 360
 361        switch (cable_type) {
 362        case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 363        case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 364                extcon_set_cable_state_(info->edev, EXTCON_DOCK, attached);
 365                break;
 366        default:
 367                dev_err(info->dev, "failed to detect %s dock device\n",
 368                        attached ? "attached" : "detached");
 369                return -EINVAL;
 370        }
 371
 372        return 0;
 373}
 374
 375static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 376                        bool attached)
 377{
 378        int ret = 0;
 379
 380        /* switch to UART */
 381        ret = max8997_muic_set_path(info, info->path_uart, attached);
 382        if (ret) {
 383                dev_err(info->dev, "failed to update muic register\n");
 384                return ret;
 385        }
 386
 387        extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
 388
 389        return 0;
 390}
 391
 392static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 393{
 394        int cable_type;
 395        bool attached;
 396        int ret = 0;
 397
 398        /* Check cable state which is either detached or attached */
 399        cable_type = max8997_muic_get_cable_type(info,
 400                                MAX8997_CABLE_GROUP_ADC, &attached);
 401
 402        switch (cable_type) {
 403        case MAX8997_MUIC_ADC_GROUND:
 404                ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 405                if (ret < 0)
 406                        return ret;
 407                break;
 408        case MAX8997_MUIC_ADC_MHL:
 409                extcon_set_cable_state_(info->edev, EXTCON_DISP_MHL, attached);
 410                break;
 411        case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 412        case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 413                ret = max8997_muic_handle_usb(info,
 414                                             MAX8997_USB_DEVICE, attached);
 415                if (ret < 0)
 416                        return ret;
 417                break;
 418        case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 419        case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 420                ret = max8997_muic_handle_dock(info, cable_type, attached);
 421                if (ret < 0)
 422                        return ret;
 423                break;
 424        case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 425                ret = max8997_muic_handle_jig_uart(info, attached);
 426                break;
 427        case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 428        case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 429        case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 430        case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 431        case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 432        case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 433        case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 434        case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 435        case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 436        case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 437        case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 438        case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 439        case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 440        case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 441        case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 442        case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 443        case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 444        case MAX8997_MUIC_ADC_CEA936_AUDIO:
 445        case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 446        case MAX8997_MUIC_ADC_TTY_CONVERTER:
 447        case MAX8997_MUIC_ADC_UART_CABLE:
 448        case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 449        case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 450        case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 451                /*
 452                 * This cable isn't used in general case if it is specially
 453                 * needed to detect additional cable, should implement
 454                 * proper operation when this cable is attached/detached.
 455                 */
 456                dev_info(info->dev,
 457                        "cable is %s but it isn't used (type:0x%x)\n",
 458                        attached ? "attached" : "detached", cable_type);
 459                return -EAGAIN;
 460        default:
 461                dev_err(info->dev,
 462                        "failed to detect %s unknown cable (type:0x%x)\n",
 463                        attached ? "attached" : "detached", cable_type);
 464                return -EINVAL;
 465        }
 466
 467        return 0;
 468}
 469
 470static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 471{
 472        int chg_type;
 473        bool attached;
 474        int adc;
 475
 476        chg_type = max8997_muic_get_cable_type(info,
 477                                MAX8997_CABLE_GROUP_CHG, &attached);
 478
 479        switch (chg_type) {
 480        case MAX8997_CHARGER_TYPE_NONE:
 481                break;
 482        case MAX8997_CHARGER_TYPE_USB:
 483                adc = info->status[0] & STATUS1_ADC_MASK;
 484                adc >>= STATUS1_ADC_SHIFT;
 485
 486                if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 487                        max8997_muic_handle_usb(info,
 488                                        MAX8997_USB_DEVICE, attached);
 489                }
 490                break;
 491        case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 492                extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_CDP,
 493                                        attached);
 494                break;
 495        case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 496                extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP,
 497                                        attached);
 498                break;
 499        case MAX8997_CHARGER_TYPE_500MA:
 500                extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SLOW,
 501                                        attached);
 502                break;
 503        case MAX8997_CHARGER_TYPE_1A:
 504                extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_FAST,
 505                                        attached);
 506                break;
 507        default:
 508                dev_err(info->dev,
 509                        "failed to detect %s unknown chg cable (type:0x%x)\n",
 510                        attached ? "attached" : "detached", chg_type);
 511                return -EINVAL;
 512        }
 513
 514        return 0;
 515}
 516
 517static void max8997_muic_irq_work(struct work_struct *work)
 518{
 519        struct max8997_muic_info *info = container_of(work,
 520                        struct max8997_muic_info, irq_work);
 521        int irq_type = 0;
 522        int i, ret;
 523
 524        if (!info->edev)
 525                return;
 526
 527        mutex_lock(&info->mutex);
 528
 529        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 530                if (info->irq == muic_irqs[i].virq)
 531                        irq_type = muic_irqs[i].irq;
 532
 533        ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 534                                2, info->status);
 535        if (ret) {
 536                dev_err(info->dev, "failed to read muic register\n");
 537                mutex_unlock(&info->mutex);
 538                return;
 539        }
 540
 541        switch (irq_type) {
 542        case MAX8997_MUICIRQ_ADCError:
 543        case MAX8997_MUICIRQ_ADCLow:
 544        case MAX8997_MUICIRQ_ADC:
 545                /* Handle all of cable except for charger cable */
 546                ret = max8997_muic_adc_handler(info);
 547                break;
 548        case MAX8997_MUICIRQ_VBVolt:
 549        case MAX8997_MUICIRQ_DBChg:
 550        case MAX8997_MUICIRQ_DCDTmr:
 551        case MAX8997_MUICIRQ_ChgDetRun:
 552        case MAX8997_MUICIRQ_ChgTyp:
 553                /* Handle charger cable */
 554                ret = max8997_muic_chg_handler(info);
 555                break;
 556        case MAX8997_MUICIRQ_OVP:
 557                break;
 558        default:
 559                dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 560                                irq_type);
 561                mutex_unlock(&info->mutex);
 562                return;
 563        }
 564
 565        if (ret < 0)
 566                dev_err(info->dev, "failed to handle MUIC interrupt\n");
 567
 568        mutex_unlock(&info->mutex);
 569}
 570
 571static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 572{
 573        struct max8997_muic_info *info = data;
 574
 575        dev_dbg(info->dev, "irq:%d\n", irq);
 576        info->irq = irq;
 577
 578        schedule_work(&info->irq_work);
 579
 580        return IRQ_HANDLED;
 581}
 582
 583static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 584{
 585        int ret = 0;
 586        int adc;
 587        int chg_type;
 588        bool attached;
 589
 590        mutex_lock(&info->mutex);
 591
 592        /* Read STATUSx register to detect accessory */
 593        ret = max8997_bulk_read(info->muic,
 594                        MAX8997_MUIC_REG_STATUS1, 2, info->status);
 595        if (ret) {
 596                dev_err(info->dev, "failed to read MUIC register\n");
 597                mutex_unlock(&info->mutex);
 598                return ret;
 599        }
 600
 601        adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 602                                        &attached);
 603        if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 604                ret = max8997_muic_adc_handler(info);
 605                if (ret < 0) {
 606                        dev_err(info->dev, "Cannot detect ADC cable\n");
 607                        mutex_unlock(&info->mutex);
 608                        return ret;
 609                }
 610        }
 611
 612        chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 613                                        &attached);
 614        if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 615                ret = max8997_muic_chg_handler(info);
 616                if (ret < 0) {
 617                        dev_err(info->dev, "Cannot detect charger cable\n");
 618                        mutex_unlock(&info->mutex);
 619                        return ret;
 620                }
 621        }
 622
 623        mutex_unlock(&info->mutex);
 624
 625        return 0;
 626}
 627
 628static void max8997_muic_detect_cable_wq(struct work_struct *work)
 629{
 630        struct max8997_muic_info *info = container_of(to_delayed_work(work),
 631                                struct max8997_muic_info, wq_detcable);
 632        int ret;
 633
 634        ret = max8997_muic_detect_dev(info);
 635        if (ret < 0)
 636                dev_err(info->dev, "failed to detect cable type\n");
 637}
 638
 639static int max8997_muic_probe(struct platform_device *pdev)
 640{
 641        struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 642        struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 643        struct max8997_muic_info *info;
 644        int delay_jiffies;
 645        int ret, i;
 646
 647        info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 648                            GFP_KERNEL);
 649        if (!info)
 650                return -ENOMEM;
 651
 652        info->dev = &pdev->dev;
 653        info->muic = max8997->muic;
 654
 655        platform_set_drvdata(pdev, info);
 656        mutex_init(&info->mutex);
 657
 658        INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 659
 660        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 661                struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 662                unsigned int virq = 0;
 663
 664                virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 665                if (!virq) {
 666                        ret = -EINVAL;
 667                        goto err_irq;
 668                }
 669                muic_irq->virq = virq;
 670
 671                ret = request_threaded_irq(virq, NULL,
 672                                max8997_muic_irq_handler,
 673                                IRQF_NO_SUSPEND,
 674                                muic_irq->name, info);
 675                if (ret) {
 676                        dev_err(&pdev->dev,
 677                                "failed: irq request (IRQ: %d, error :%d)\n",
 678                                muic_irq->irq, ret);
 679                        goto err_irq;
 680                }
 681        }
 682
 683        /* External connector */
 684        info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 685        if (IS_ERR(info->edev)) {
 686                dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 687                ret = -ENOMEM;
 688                goto err_irq;
 689        }
 690
 691        ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 692        if (ret) {
 693                dev_err(&pdev->dev, "failed to register extcon device\n");
 694                goto err_irq;
 695        }
 696
 697        if (pdata && pdata->muic_pdata) {
 698                struct max8997_muic_platform_data *muic_pdata
 699                        = pdata->muic_pdata;
 700
 701                /* Initialize registers according to platform data */
 702                for (i = 0; i < muic_pdata->num_init_data; i++) {
 703                        max8997_write_reg(info->muic,
 704                                        muic_pdata->init_data[i].addr,
 705                                        muic_pdata->init_data[i].data);
 706                }
 707
 708                /*
 709                 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 710                 * h/w path of COMP2/COMN1 on CONTROL1 register.
 711                 */
 712                if (muic_pdata->path_uart)
 713                        info->path_uart = muic_pdata->path_uart;
 714                else
 715                        info->path_uart = CONTROL1_SW_UART;
 716
 717                if (muic_pdata->path_usb)
 718                        info->path_usb = muic_pdata->path_usb;
 719                else
 720                        info->path_usb = CONTROL1_SW_USB;
 721
 722                /*
 723                 * Default delay time for detecting cable state
 724                 * after certain time.
 725                 */
 726                if (muic_pdata->detcable_delay_ms)
 727                        delay_jiffies =
 728                                msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 729                else
 730                        delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 731        } else {
 732                info->path_uart = CONTROL1_SW_UART;
 733                info->path_usb = CONTROL1_SW_USB;
 734                delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 735        }
 736
 737        /* Set initial path for UART */
 738         max8997_muic_set_path(info, info->path_uart, true);
 739
 740        /* Set ADC debounce time */
 741        max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 742
 743        /*
 744         * Detect accessory after completing the initialization of platform
 745         *
 746         * - Use delayed workqueue to detect cable state and then
 747         * notify cable state to notifiee/platform through uevent.
 748         * After completing the booting of platform, the extcon provider
 749         * driver should notify cable state to upper layer.
 750         */
 751        INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 752        queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 753                        delay_jiffies);
 754
 755        return 0;
 756
 757err_irq:
 758        while (--i >= 0)
 759                free_irq(muic_irqs[i].virq, info);
 760        return ret;
 761}
 762
 763static int max8997_muic_remove(struct platform_device *pdev)
 764{
 765        struct max8997_muic_info *info = platform_get_drvdata(pdev);
 766        int i;
 767
 768        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 769                free_irq(muic_irqs[i].virq, info);
 770        cancel_work_sync(&info->irq_work);
 771
 772        return 0;
 773}
 774
 775static struct platform_driver max8997_muic_driver = {
 776        .driver         = {
 777                .name   = DEV_NAME,
 778        },
 779        .probe          = max8997_muic_probe,
 780        .remove         = max8997_muic_remove,
 781};
 782
 783module_platform_driver(max8997_muic_driver);
 784
 785MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 786MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 787MODULE_LICENSE("GPL");
 788
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