drivers/extcon/extcon-max8997.c

   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-provider.h>
  29 #include <linux/irqdomain.h>
  30
  31 #define DEV_NAME                        "max8997-muic"
  32 #define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
  33
  34 enum 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
  41 struct max8997_muic_irq {
  42         unsigned int irq;
  43         const char *name;
  44         unsigned int virq;
  45 };
  46
  47 static 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 */
  60 enum 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
  95 enum 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
 102 enum max8997_muic_usb_type {
 103         MAX8997_USB_HOST,
 104         MAX8997_USB_DEVICE,
 105 };
 106
 107 enum 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
 117 struct 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
 148 static 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  */
 167 static 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  */
 204 static int max8997_muic_set_path(struct max8997_muic_info *info,
 205                 u8 val, bool attached)
 206 {
 207         int ret;
 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  */
 253 static 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
 319 static 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         ret = max8997_muic_set_path(info, info->path_usb, attached);
 325         if (ret < 0) {
 326                 dev_err(info->dev, "failed to update muic register\n");
 327                 return ret;
 328         }
 329
 330         switch (usb_type) {
 331         case MAX8997_USB_HOST:
 332                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
 333                 break;
 334         case MAX8997_USB_DEVICE:
 335                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
 336                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 337                                         attached);
 338                 break;
 339         default:
 340                 dev_err(info->dev, "failed to detect %s usb cable\n",
 341                         attached ? "attached" : "detached");
 342                 return -EINVAL;
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 349                         int cable_type, bool attached)
 350 {
 351         int ret = 0;
 352
 353         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 354         if (ret) {
 355                 dev_err(info->dev, "failed to update muic register\n");
 356                 return ret;
 357         }
 358
 359         switch (cable_type) {
 360         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 361         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 362                 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
 363                 break;
 364         default:
 365                 dev_err(info->dev, "failed to detect %s dock device\n",
 366                         attached ? "attached" : "detached");
 367                 return -EINVAL;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 374                         bool attached)
 375 {
 376         int ret = 0;
 377
 378         /* switch to UART */
 379         ret = max8997_muic_set_path(info, info->path_uart, attached);
 380         if (ret) {
 381                 dev_err(info->dev, "failed to update muic register\n");
 382                 return ret;
 383         }
 384
 385         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
 386
 387         return 0;
 388 }
 389
 390 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 391 {
 392         int cable_type;
 393         bool attached;
 394         int ret = 0;
 395
 396         /* Check cable state which is either detached or attached */
 397         cable_type = max8997_muic_get_cable_type(info,
 398                                 MAX8997_CABLE_GROUP_ADC, &attached);
 399
 400         switch (cable_type) {
 401         case MAX8997_MUIC_ADC_GROUND:
 402                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 403                 if (ret < 0)
 404                         return ret;
 405                 break;
 406         case MAX8997_MUIC_ADC_MHL:
 407                 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
 408                 break;
 409         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 410         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 411                 ret = max8997_muic_handle_usb(info,
 412                                              MAX8997_USB_DEVICE, attached);
 413                 if (ret < 0)
 414                         return ret;
 415                 break;
 416         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 417         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 418                 ret = max8997_muic_handle_dock(info, cable_type, attached);
 419                 if (ret < 0)
 420                         return ret;
 421                 break;
 422         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 423                 ret = max8997_muic_handle_jig_uart(info, attached);
 424                 break;
 425         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 426         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 427         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 428         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 429         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 430         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 431         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 432         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 433         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 434         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 435         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 436         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 437         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 438         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 439         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 440         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 441         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 442         case MAX8997_MUIC_ADC_CEA936_AUDIO:
 443         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 444         case MAX8997_MUIC_ADC_TTY_CONVERTER:
 445         case MAX8997_MUIC_ADC_UART_CABLE:
 446         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 447         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 448         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 449                 /*
 450                  * This cable isn't used in general case if it is specially
 451                  * needed to detect additional cable, should implement
 452                  * proper operation when this cable is attached/detached.
 453                  */
 454                 dev_info(info->dev,
 455                         "cable is %s but it isn't used (type:0x%x)\n",
 456                         attached ? "attached" : "detached", cable_type);
 457                 return -EAGAIN;
 458         default:
 459                 dev_err(info->dev,
 460                         "failed to detect %s unknown cable (type:0x%x)\n",
 461                         attached ? "attached" : "detached", cable_type);
 462                 return -EINVAL;
 463         }
 464
 465         return 0;
 466 }
 467
 468 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 469 {
 470         int chg_type;
 471         bool attached;
 472         int adc;
 473
 474         chg_type = max8997_muic_get_cable_type(info,
 475                                 MAX8997_CABLE_GROUP_CHG, &attached);
 476
 477         switch (chg_type) {
 478         case MAX8997_CHARGER_TYPE_NONE:
 479                 break;
 480         case MAX8997_CHARGER_TYPE_USB:
 481                 adc = info->status[0] & STATUS1_ADC_MASK;
 482                 adc >>= STATUS1_ADC_SHIFT;
 483
 484                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 485                         max8997_muic_handle_usb(info,
 486                                         MAX8997_USB_DEVICE, attached);
 487                 }
 488                 break;
 489         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 490                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
 491                                         attached);
 492                 break;
 493         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 494                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 495                                         attached);
 496                 break;
 497         case MAX8997_CHARGER_TYPE_500MA:
 498                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
 499                                         attached);
 500                 break;
 501         case MAX8997_CHARGER_TYPE_1A:
 502                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
 503                                         attached);
 504                 break;
 505         default:
 506                 dev_err(info->dev,
 507                         "failed to detect %s unknown chg cable (type:0x%x)\n",
 508                         attached ? "attached" : "detached", chg_type);
 509                 return -EINVAL;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static void max8997_muic_irq_work(struct work_struct *work)
 516 {
 517         struct max8997_muic_info *info = container_of(work,
 518                         struct max8997_muic_info, irq_work);
 519         int irq_type = 0;
 520         int i, ret;
 521
 522         if (!info->edev)
 523                 return;
 524
 525         mutex_lock(&info->mutex);
 526
 527         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 528                 if (info->irq == muic_irqs[i].virq)
 529                         irq_type = muic_irqs[i].irq;
 530
 531         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 532                                 2, info->status);
 533         if (ret) {
 534                 dev_err(info->dev, "failed to read muic register\n");
 535                 mutex_unlock(&info->mutex);
 536                 return;
 537         }
 538
 539         switch (irq_type) {
 540         case MAX8997_MUICIRQ_ADCError:
 541         case MAX8997_MUICIRQ_ADCLow:
 542         case MAX8997_MUICIRQ_ADC:
 543                 /* Handle all of cable except for charger cable */
 544                 ret = max8997_muic_adc_handler(info);
 545                 break;
 546         case MAX8997_MUICIRQ_VBVolt:
 547         case MAX8997_MUICIRQ_DBChg:
 548         case MAX8997_MUICIRQ_DCDTmr:
 549         case MAX8997_MUICIRQ_ChgDetRun:
 550         case MAX8997_MUICIRQ_ChgTyp:
 551                 /* Handle charger cable */
 552                 ret = max8997_muic_chg_handler(info);
 553                 break;
 554         case MAX8997_MUICIRQ_OVP:
 555                 break;
 556         default:
 557                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 558                                 irq_type);
 559                 mutex_unlock(&info->mutex);
 560                 return;
 561         }
 562
 563         if (ret < 0)
 564                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 565
 566         mutex_unlock(&info->mutex);
 567 }
 568
 569 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 570 {
 571         struct max8997_muic_info *info = data;
 572
 573         dev_dbg(info->dev, "irq:%d\n", irq);
 574         info->irq = irq;
 575
 576         schedule_work(&info->irq_work);
 577
 578         return IRQ_HANDLED;
 579 }
 580
 581 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 582 {
 583         int ret = 0;
 584         int adc;
 585         int chg_type;
 586         bool attached;
 587
 588         mutex_lock(&info->mutex);
 589
 590         /* Read STATUSx register to detect accessory */
 591         ret = max8997_bulk_read(info->muic,
 592                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
 593         if (ret) {
 594                 dev_err(info->dev, "failed to read MUIC register\n");
 595                 mutex_unlock(&info->mutex);
 596                 return ret;
 597         }
 598
 599         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 600                                         &attached);
 601         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 602                 ret = max8997_muic_adc_handler(info);
 603                 if (ret < 0) {
 604                         dev_err(info->dev, "Cannot detect ADC cable\n");
 605                         mutex_unlock(&info->mutex);
 606                         return ret;
 607                 }
 608         }
 609
 610         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 611                                         &attached);
 612         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 613                 ret = max8997_muic_chg_handler(info);
 614                 if (ret < 0) {
 615                         dev_err(info->dev, "Cannot detect charger cable\n");
 616                         mutex_unlock(&info->mutex);
 617                         return ret;
 618                 }
 619         }
 620
 621         mutex_unlock(&info->mutex);
 622
 623         return 0;
 624 }
 625
 626 static void max8997_muic_detect_cable_wq(struct work_struct *work)
 627 {
 628         struct max8997_muic_info *info = container_of(to_delayed_work(work),
 629                                 struct max8997_muic_info, wq_detcable);
 630         int ret;
 631
 632         ret = max8997_muic_detect_dev(info);
 633         if (ret < 0)
 634                 dev_err(info->dev, "failed to detect cable type\n");
 635 }
 636
 637 static int max8997_muic_probe(struct platform_device *pdev)
 638 {
 639         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 640         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 641         struct max8997_muic_info *info;
 642         int delay_jiffies;
 643         int ret, i;
 644
 645         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 646                             GFP_KERNEL);
 647         if (!info)
 648                 return -ENOMEM;
 649
 650         info->dev = &pdev->dev;
 651         info->muic = max8997->muic;
 652
 653         platform_set_drvdata(pdev, info);
 654         mutex_init(&info->mutex);
 655
 656         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 657
 658         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 659                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 660                 unsigned int virq = 0;
 661
 662                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 663                 if (!virq) {
 664                         ret = -EINVAL;
 665                         goto err_irq;
 666                 }
 667                 muic_irq->virq = virq;
 668
 669                 ret = request_threaded_irq(virq, NULL,
 670                                 max8997_muic_irq_handler,
 671                                 IRQF_NO_SUSPEND,
 672                                 muic_irq->name, info);
 673                 if (ret) {
 674                         dev_err(&pdev->dev,
 675                                 "failed: irq request (IRQ: %d, error :%d)\n",
 676                                 muic_irq->irq, ret);
 677                         goto err_irq;
 678                 }
 679         }
 680
 681         /* External connector */
 682         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 683         if (IS_ERR(info->edev)) {
 684                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 685                 ret = -ENOMEM;
 686                 goto err_irq;
 687         }
 688
 689         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 690         if (ret) {
 691                 dev_err(&pdev->dev, "failed to register extcon device\n");
 692                 goto err_irq;
 693         }
 694
 695         if (pdata && pdata->muic_pdata) {
 696                 struct max8997_muic_platform_data *muic_pdata
 697                         = pdata->muic_pdata;
 698
 699                 /* Initialize registers according to platform data */
 700                 for (i = 0; i < muic_pdata->num_init_data; i++) {
 701                         max8997_write_reg(info->muic,
 702                                         muic_pdata->init_data[i].addr,
 703                                         muic_pdata->init_data[i].data);
 704                 }
 705
 706                 /*
 707                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 708                  * h/w path of COMP2/COMN1 on CONTROL1 register.
 709                  */
 710                 if (muic_pdata->path_uart)
 711                         info->path_uart = muic_pdata->path_uart;
 712                 else
 713                         info->path_uart = CONTROL1_SW_UART;
 714
 715                 if (muic_pdata->path_usb)
 716                         info->path_usb = muic_pdata->path_usb;
 717                 else
 718                         info->path_usb = CONTROL1_SW_USB;
 719
 720                 /*
 721                  * Default delay time for detecting cable state
 722                  * after certain time.
 723                  */
 724                 if (muic_pdata->detcable_delay_ms)
 725                         delay_jiffies =
 726                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 727                 else
 728                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 729         } else {
 730                 info->path_uart = CONTROL1_SW_UART;
 731                 info->path_usb = CONTROL1_SW_USB;
 732                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 733         }
 734
 735         /* Set initial path for UART */
 736          max8997_muic_set_path(info, info->path_uart, true);
 737
 738         /* Set ADC debounce time */
 739         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 740
 741         /*
 742          * Detect accessory after completing the initialization of platform
 743          *
 744          * - Use delayed workqueue to detect cable state and then
 745          * notify cable state to notifiee/platform through uevent.
 746          * After completing the booting of platform, the extcon provider
 747          * driver should notify cable state to upper layer.
 748          */
 749         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 750         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 751                         delay_jiffies);
 752
 753         return 0;
 754
 755 err_irq:
 756         while (--i >= 0)
 757                 free_irq(muic_irqs[i].virq, info);
 758         return ret;
 759 }
 760
 761 static int max8997_muic_remove(struct platform_device *pdev)
 762 {
 763         struct max8997_muic_info *info = platform_get_drvdata(pdev);
 764         int i;
 765
 766         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 767                 free_irq(muic_irqs[i].virq, info);
 768         cancel_work_sync(&info->irq_work);
 769
 770         return 0;
 771 }
 772
 773 static struct platform_driver max8997_muic_driver = {
 774         .driver         = {
 775                 .name   = DEV_NAME,
 776         },
 777         .probe          = max8997_muic_probe,
 778         .remove         = max8997_muic_remove,
 779 };
 780
 781 module_platform_driver(max8997_muic_driver);
 782
 783 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 784 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 785 MODULE_LICENSE("GPL");
 786 MODULE_ALIAS("platform:max8997-muic");