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.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 enum {
 149         EXTCON_CABLE_USB = 0,
 150         EXTCON_CABLE_USB_HOST,
 151         EXTCON_CABLE_TA,
 152         EXTCON_CABLE_FAST_CHARGER,
 153         EXTCON_CABLE_SLOW_CHARGER,
 154         EXTCON_CABLE_CHARGE_DOWNSTREAM,
 155         EXTCON_CABLE_MHL,
 156         EXTCON_CABLE_DOCK,
 157         EXTCON_CABLE_JIG,
 158
 159         _EXTCON_CABLE_NUM,
 160 };
 161
 162 static const char *max8997_extcon_cable[] = {
 163         [EXTCON_CABLE_USB]                      = "USB",
 164         [EXTCON_CABLE_USB_HOST]                 = "USB-Host",
 165         [EXTCON_CABLE_TA]                       = "TA",
 166         [EXTCON_CABLE_FAST_CHARGER]             = "Fast-charger",
 167         [EXTCON_CABLE_SLOW_CHARGER]             = "Slow-charger",
 168         [EXTCON_CABLE_CHARGE_DOWNSTREAM]        = "Charge-downstream",
 169         [EXTCON_CABLE_MHL]                      = "MHL",
 170         [EXTCON_CABLE_DOCK]                     = "DOCK",
 171         [EXTCON_CABLE_JIG]                      = "JIG",
 172
 173         NULL,
 174 };
 175
 176 /*
 177  * max8997_muic_set_debounce_time - Set the debounce time of ADC
 178  * @info: the instance including private data of max8997 MUIC
 179  * @time: the debounce time of ADC
 180  */
 181 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
 182                 enum max8997_muic_adc_debounce_time time)
 183 {
 184         int ret;
 185
 186         switch (time) {
 187         case ADC_DEBOUNCE_TIME_0_5MS:
 188         case ADC_DEBOUNCE_TIME_10MS:
 189         case ADC_DEBOUNCE_TIME_25MS:
 190         case ADC_DEBOUNCE_TIME_38_62MS:
 191                 ret = max8997_update_reg(info->muic,
 192                                           MAX8997_MUIC_REG_CONTROL3,
 193                                           time << CONTROL3_ADCDBSET_SHIFT,
 194                                           CONTROL3_ADCDBSET_MASK);
 195                 if (ret) {
 196                         dev_err(info->dev, "failed to set ADC debounce time\n");
 197                         return ret;
 198                 }
 199                 break;
 200         default:
 201                 dev_err(info->dev, "invalid ADC debounce time\n");
 202                 return -EINVAL;
 203         }
 204
 205         return 0;
 206 };
 207
 208 /*
 209  * max8997_muic_set_path - Set hardware line according to attached cable
 210  * @info: the instance including private data of max8997 MUIC
 211  * @value: the path according to attached cable
 212  * @attached: the state of cable (true:attached, false:detached)
 213  *
 214  * The max8997 MUIC device share outside H/W line among a varity of cables,
 215  * so this function set internal path of H/W line according to the type of
 216  * attached cable.
 217  */
 218 static int max8997_muic_set_path(struct max8997_muic_info *info,
 219                 u8 val, bool attached)
 220 {
 221         int ret = 0;
 222         u8 ctrl1, ctrl2 = 0;
 223
 224         if (attached)
 225                 ctrl1 = val;
 226         else
 227                 ctrl1 = CONTROL1_SW_OPEN;
 228
 229         ret = max8997_update_reg(info->muic,
 230                         MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
 231         if (ret < 0) {
 232                 dev_err(info->dev, "failed to update MUIC register\n");
 233                 return ret;
 234         }
 235
 236         if (attached)
 237                 ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
 238         else
 239                 ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
 240
 241         ret = max8997_update_reg(info->muic,
 242                         MAX8997_MUIC_REG_CONTROL2, ctrl2,
 243                         CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
 244         if (ret < 0) {
 245                 dev_err(info->dev, "failed to update MUIC register\n");
 246                 return ret;
 247         }
 248
 249         dev_info(info->dev,
 250                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 251                 ctrl1, ctrl2, attached ? "attached" : "detached");
 252
 253         return 0;
 254 }
 255
 256 /*
 257  * max8997_muic_get_cable_type - Return cable type and check cable state
 258  * @info: the instance including private data of max8997 MUIC
 259  * @group: the path according to attached cable
 260  * @attached: store cable state and return
 261  *
 262  * This function check the cable state either attached or detached,
 263  * and then divide precise type of cable according to cable group.
 264  *      - MAX8997_CABLE_GROUP_ADC
 265  *      - MAX8997_CABLE_GROUP_CHG
 266  */
 267 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
 268                 enum max8997_muic_cable_group group, bool *attached)
 269 {
 270         int cable_type = 0;
 271         int adc;
 272         int chg_type;
 273
 274         switch (group) {
 275         case MAX8997_CABLE_GROUP_ADC:
 276                 /*
 277                  * Read ADC value to check cable type and decide cable state
 278                  * according to cable type
 279                  */
 280                 adc = info->status[0] & STATUS1_ADC_MASK;
 281                 adc >>= STATUS1_ADC_SHIFT;
 282
 283                 /*
 284                  * Check current cable state/cable type and store cable type
 285                  * (info->prev_cable_type) for handling cable when cable is
 286                  * detached.
 287                  */
 288                 if (adc == MAX8997_MUIC_ADC_OPEN) {
 289                         *attached = false;
 290
 291                         cable_type = info->prev_cable_type;
 292                         info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
 293                 } else {
 294                         *attached = true;
 295
 296                         cable_type = info->prev_cable_type = adc;
 297                 }
 298                 break;
 299         case MAX8997_CABLE_GROUP_CHG:
 300                 /*
 301                  * Read charger type to check cable type and decide cable state
 302                  * according to type of charger cable.
 303                  */
 304                 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
 305                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 306
 307                 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
 308                         *attached = false;
 309
 310                         cable_type = info->prev_chg_type;
 311                         info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
 312                 } else {
 313                         *attached = true;
 314
 315                         /*
 316                          * Check current cable state/cable type and store cable
 317                          * type(info->prev_chg_type) for handling cable when
 318                          * charger cable is detached.
 319                          */
 320                         cable_type = info->prev_chg_type = chg_type;
 321                 }
 322
 323                 break;
 324         default:
 325                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 326                 cable_type = -EINVAL;
 327                 break;
 328         }
 329
 330         return cable_type;
 331 }
 332
 333 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 334                         enum max8997_muic_usb_type usb_type, bool attached)
 335 {
 336         int ret = 0;
 337
 338         if (usb_type == MAX8997_USB_HOST) {
 339                 ret = max8997_muic_set_path(info, info->path_usb, attached);
 340                 if (ret < 0) {
 341                         dev_err(info->dev, "failed to update muic register\n");
 342                         return ret;
 343                 }
 344         }
 345
 346         switch (usb_type) {
 347         case MAX8997_USB_HOST:
 348                 extcon_set_cable_state(info->edev, "USB-Host", attached);
 349                 break;
 350         case MAX8997_USB_DEVICE:
 351                 extcon_set_cable_state(info->edev, "USB", attached);
 352                 break;
 353         default:
 354                 dev_err(info->dev, "failed to detect %s usb cable\n",
 355                         attached ? "attached" : "detached");
 356                 return -EINVAL;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 363                         int cable_type, bool attached)
 364 {
 365         int ret = 0;
 366
 367         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 368         if (ret) {
 369                 dev_err(info->dev, "failed to update muic register\n");
 370                 return ret;
 371         }
 372
 373         switch (cable_type) {
 374         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 375         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 376                 extcon_set_cable_state(info->edev, "DOCK", attached);
 377                 break;
 378         default:
 379                 dev_err(info->dev, "failed to detect %s dock device\n",
 380                         attached ? "attached" : "detached");
 381                 return -EINVAL;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 388                         bool attached)
 389 {
 390         int ret = 0;
 391
 392         /* switch to UART */
 393         ret = max8997_muic_set_path(info, info->path_uart, attached);
 394         if (ret) {
 395                 dev_err(info->dev, "failed to update muic register\n");
 396                 return ret;
 397         }
 398
 399         extcon_set_cable_state(info->edev, "JIG", attached);
 400
 401         return 0;
 402 }
 403
 404 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 405 {
 406         int cable_type;
 407         bool attached;
 408         int ret = 0;
 409
 410         /* Check cable state which is either detached or attached */
 411         cable_type = max8997_muic_get_cable_type(info,
 412                                 MAX8997_CABLE_GROUP_ADC, &attached);
 413
 414         switch (cable_type) {
 415         case MAX8997_MUIC_ADC_GROUND:
 416                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 417                 if (ret < 0)
 418                         return ret;
 419                 break;
 420         case MAX8997_MUIC_ADC_MHL:
 421                 extcon_set_cable_state(info->edev, "MHL", attached);
 422                 break;
 423         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 424         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 425                 ret = max8997_muic_handle_usb(info,
 426                                              MAX8997_USB_DEVICE, attached);
 427                 if (ret < 0)
 428                         return ret;
 429                 break;
 430         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 431         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 432                 ret = max8997_muic_handle_dock(info, cable_type, attached);
 433                 if (ret < 0)
 434                         return ret;
 435                 break;
 436         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 437                 ret = max8997_muic_handle_jig_uart(info, attached);
 438                 break;
 439         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 440         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 441         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 442         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 443         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 444         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 445         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 446         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 447         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 448         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 449         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 450         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 451         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 452         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 453         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 454         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 455         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 456         case MAX8997_MUIC_ADC_CEA936_AUDIO:
 457         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 458         case MAX8997_MUIC_ADC_TTY_CONVERTER:
 459         case MAX8997_MUIC_ADC_UART_CABLE:
 460         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 461         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 462         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 463                 /*
 464                  * This cable isn't used in general case if it is specially
 465                  * needed to detect additional cable, should implement
 466                  * proper operation when this cable is attached/detached.
 467                  */
 468                 dev_info(info->dev,
 469                         "cable is %s but it isn't used (type:0x%x)\n",
 470                         attached ? "attached" : "detached", cable_type);
 471                 return -EAGAIN;
 472         default:
 473                 dev_err(info->dev,
 474                         "failed to detect %s unknown cable (type:0x%x)\n",
 475                         attached ? "attached" : "detached", cable_type);
 476                 return -EINVAL;
 477         }
 478
 479         return 0;
 480 }
 481
 482 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 483 {
 484         int chg_type;
 485         bool attached;
 486         int adc;
 487
 488         chg_type = max8997_muic_get_cable_type(info,
 489                                 MAX8997_CABLE_GROUP_CHG, &attached);
 490
 491         switch (chg_type) {
 492         case MAX8997_CHARGER_TYPE_NONE:
 493                 break;
 494         case MAX8997_CHARGER_TYPE_USB:
 495                 adc = info->status[0] & STATUS1_ADC_MASK;
 496                 adc >>= STATUS1_ADC_SHIFT;
 497
 498                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 499                         max8997_muic_handle_usb(info,
 500                                         MAX8997_USB_DEVICE, attached);
 501                 }
 502                 break;
 503         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 504                 extcon_set_cable_state(info->edev,
 505                                       "Charge-downstream", attached);
 506                 break;
 507         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 508                 extcon_set_cable_state(info->edev, "TA", attached);
 509                 break;
 510         case MAX8997_CHARGER_TYPE_500MA:
 511                 extcon_set_cable_state(info->edev, "Slow-charger", attached);
 512                 break;
 513         case MAX8997_CHARGER_TYPE_1A:
 514                 extcon_set_cable_state(info->edev, "Fast-charger", attached);
 515                 break;
 516         default:
 517                 dev_err(info->dev,
 518                         "failed to detect %s unknown chg cable (type:0x%x)\n",
 519                         attached ? "attached" : "detached", chg_type);
 520                 return -EINVAL;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static void max8997_muic_irq_work(struct work_struct *work)
 527 {
 528         struct max8997_muic_info *info = container_of(work,
 529                         struct max8997_muic_info, irq_work);
 530         int irq_type = 0;
 531         int i, ret;
 532
 533         if (!info->edev)
 534                 return;
 535
 536         mutex_lock(&info->mutex);
 537
 538         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 539                 if (info->irq == muic_irqs[i].virq)
 540                         irq_type = muic_irqs[i].irq;
 541
 542         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 543                                 2, info->status);
 544         if (ret) {
 545                 dev_err(info->dev, "failed to read muic register\n");
 546                 mutex_unlock(&info->mutex);
 547                 return;
 548         }
 549
 550         switch (irq_type) {
 551         case MAX8997_MUICIRQ_ADCError:
 552         case MAX8997_MUICIRQ_ADCLow:
 553         case MAX8997_MUICIRQ_ADC:
 554                 /* Handle all of cable except for charger cable */
 555                 ret = max8997_muic_adc_handler(info);
 556                 break;
 557         case MAX8997_MUICIRQ_VBVolt:
 558         case MAX8997_MUICIRQ_DBChg:
 559         case MAX8997_MUICIRQ_DCDTmr:
 560         case MAX8997_MUICIRQ_ChgDetRun:
 561         case MAX8997_MUICIRQ_ChgTyp:
 562                 /* Handle charger cable */
 563                 ret = max8997_muic_chg_handler(info);
 564                 break;
 565         case MAX8997_MUICIRQ_OVP:
 566                 break;
 567         default:
 568                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 569                                 irq_type);
 570                 mutex_unlock(&info->mutex);
 571                 return;
 572         }
 573
 574         if (ret < 0)
 575                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 576
 577         mutex_unlock(&info->mutex);
 578 }
 579
 580 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 581 {
 582         struct max8997_muic_info *info = data;
 583
 584         dev_dbg(info->dev, "irq:%d\n", irq);
 585         info->irq = irq;
 586
 587         schedule_work(&info->irq_work);
 588
 589         return IRQ_HANDLED;
 590 }
 591
 592 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 593 {
 594         int ret = 0;
 595         int adc;
 596         int chg_type;
 597         bool attached;
 598
 599         mutex_lock(&info->mutex);
 600
 601         /* Read STATUSx register to detect accessory */
 602         ret = max8997_bulk_read(info->muic,
 603                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
 604         if (ret) {
 605                 dev_err(info->dev, "failed to read MUIC register\n");
 606                 mutex_unlock(&info->mutex);
 607                 return ret;
 608         }
 609
 610         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 611                                         &attached);
 612         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 613                 ret = max8997_muic_adc_handler(info);
 614                 if (ret < 0) {
 615                         dev_err(info->dev, "Cannot detect ADC cable\n");
 616                         mutex_unlock(&info->mutex);
 617                         return ret;
 618                 }
 619         }
 620
 621         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 622                                         &attached);
 623         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 624                 ret = max8997_muic_chg_handler(info);
 625                 if (ret < 0) {
 626                         dev_err(info->dev, "Cannot detect charger cable\n");
 627                         mutex_unlock(&info->mutex);
 628                         return ret;
 629                 }
 630         }
 631
 632         mutex_unlock(&info->mutex);
 633
 634         return 0;
 635 }
 636
 637 static void max8997_muic_detect_cable_wq(struct work_struct *work)
 638 {
 639         struct max8997_muic_info *info = container_of(to_delayed_work(work),
 640                                 struct max8997_muic_info, wq_detcable);
 641         int ret;
 642
 643         ret = max8997_muic_detect_dev(info);
 644         if (ret < 0)
 645                 dev_err(info->dev, "failed to detect cable type\n");
 646 }
 647
 648 static int max8997_muic_probe(struct platform_device *pdev)
 649 {
 650         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 651         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 652         struct max8997_muic_info *info;
 653         int delay_jiffies;
 654         int ret, i;
 655
 656         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 657                             GFP_KERNEL);
 658         if (!info)
 659                 return -ENOMEM;
 660
 661         info->dev = &pdev->dev;
 662         info->muic = max8997->muic;
 663
 664         platform_set_drvdata(pdev, info);
 665         mutex_init(&info->mutex);
 666
 667         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 668
 669         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 670                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 671                 unsigned int virq = 0;
 672
 673                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 674                 if (!virq) {
 675                         ret = -EINVAL;
 676                         goto err_irq;
 677                 }
 678                 muic_irq->virq = virq;
 679
 680                 ret = request_threaded_irq(virq, NULL,
 681                                 max8997_muic_irq_handler,
 682                                 IRQF_NO_SUSPEND,
 683                                 muic_irq->name, info);
 684                 if (ret) {
 685                         dev_err(&pdev->dev,
 686                                 "failed: irq request (IRQ: %d, error :%d)\n",
 687                                 muic_irq->irq, ret);
 688                         goto err_irq;
 689                 }
 690         }
 691
 692         /* External connector */
 693         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 694         if (IS_ERR(info->edev)) {
 695                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 696                 ret = -ENOMEM;
 697                 goto err_irq;
 698         }
 699         info->edev->name = DEV_NAME;
 700
 701         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 702         if (ret) {
 703                 dev_err(&pdev->dev, "failed to register extcon device\n");
 704                 goto err_irq;
 705         }
 706
 707         if (pdata && pdata->muic_pdata) {
 708                 struct max8997_muic_platform_data *muic_pdata
 709                         = pdata->muic_pdata;
 710
 711                 /* Initialize registers according to platform data */
 712                 for (i = 0; i < muic_pdata->num_init_data; i++) {
 713                         max8997_write_reg(info->muic,
 714                                         muic_pdata->init_data[i].addr,
 715                                         muic_pdata->init_data[i].data);
 716                 }
 717
 718                 /*
 719                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 720                  * h/w path of COMP2/COMN1 on CONTROL1 register.
 721                  */
 722                 if (muic_pdata->path_uart)
 723                         info->path_uart = muic_pdata->path_uart;
 724                 else
 725                         info->path_uart = CONTROL1_SW_UART;
 726
 727                 if (muic_pdata->path_usb)
 728                         info->path_usb = muic_pdata->path_usb;
 729                 else
 730                         info->path_usb = CONTROL1_SW_USB;
 731
 732                 /*
 733                  * Default delay time for detecting cable state
 734                  * after certain time.
 735                  */
 736                 if (muic_pdata->detcable_delay_ms)
 737                         delay_jiffies =
 738                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 739                 else
 740                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 741         } else {
 742                 info->path_uart = CONTROL1_SW_UART;
 743                 info->path_usb = CONTROL1_SW_USB;
 744                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 745         }
 746
 747         /* Set initial path for UART */
 748          max8997_muic_set_path(info, info->path_uart, true);
 749
 750         /* Set ADC debounce time */
 751         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 752
 753         /*
 754          * Detect accessory after completing the initialization of platform
 755          *
 756          * - Use delayed workqueue to detect cable state and then
 757          * notify cable state to notifiee/platform through uevent.
 758          * After completing the booting of platform, the extcon provider
 759          * driver should notify cable state to upper layer.
 760          */
 761         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 762         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 763                         delay_jiffies);
 764
 765         return 0;
 766
 767 err_irq:
 768         while (--i >= 0)
 769                 free_irq(muic_irqs[i].virq, info);
 770         return ret;
 771 }
 772
 773 static int max8997_muic_remove(struct platform_device *pdev)
 774 {
 775         struct max8997_muic_info *info = platform_get_drvdata(pdev);
 776         int i;
 777
 778         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 779                 free_irq(muic_irqs[i].virq, info);
 780         cancel_work_sync(&info->irq_work);
 781
 782         return 0;
 783 }
 784
 785 static struct platform_driver max8997_muic_driver = {
 786         .driver         = {
 787                 .name   = DEV_NAME,
 788         },
 789         .probe          = max8997_muic_probe,
 790         .remove         = max8997_muic_remove,
 791 };
 792
 793 module_platform_driver(max8997_muic_driver);
 794
 795 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 796 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 797 MODULE_LICENSE("GPL");