kernel/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_DESK,
 157         EXTCON_CABLE_DOCK_CARD,
 158         EXTCON_CABLE_JIG,
 159
 160         _EXTCON_CABLE_NUM,
 161 };
 162
 163 static const char *max8997_extcon_cable[] = {
 164         [EXTCON_CABLE_USB]                      = "USB",
 165         [EXTCON_CABLE_USB_HOST]                 = "USB-Host",
 166         [EXTCON_CABLE_TA]                       = "TA",
 167         [EXTCON_CABLE_FAST_CHARGER]             = "Fast-charger",
 168         [EXTCON_CABLE_SLOW_CHARGER]             = "Slow-charger",
 169         [EXTCON_CABLE_CHARGE_DOWNSTREAM]        = "Charge-downstream",
 170         [EXTCON_CABLE_MHL]                      = "MHL",
 171         [EXTCON_CABLE_DOCK_DESK]                = "Dock-Desk",
 172         [EXTCON_CABLE_DOCK_CARD]                = "Dock-Card",
 173         [EXTCON_CABLE_JIG]                      = "JIG",
 174
 175         NULL,
 176 };
 177
 178 /*
 179  * max8997_muic_set_debounce_time - Set the debounce time of ADC
 180  * @info: the instance including private data of max8997 MUIC
 181  * @time: the debounce time of ADC
 182  */
 183 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
 184                 enum max8997_muic_adc_debounce_time time)
 185 {
 186         int ret;
 187
 188         switch (time) {
 189         case ADC_DEBOUNCE_TIME_0_5MS:
 190         case ADC_DEBOUNCE_TIME_10MS:
 191         case ADC_DEBOUNCE_TIME_25MS:
 192         case ADC_DEBOUNCE_TIME_38_62MS:
 193                 ret = max8997_update_reg(info->muic,
 194                                           MAX8997_MUIC_REG_CONTROL3,
 195                                           time << CONTROL3_ADCDBSET_SHIFT,
 196                                           CONTROL3_ADCDBSET_MASK);
 197                 if (ret) {
 198                         dev_err(info->dev, "failed to set ADC debounce time\n");
 199                         return ret;
 200                 }
 201                 break;
 202         default:
 203                 dev_err(info->dev, "invalid ADC debounce time\n");
 204                 return -EINVAL;
 205         }
 206
 207         return 0;
 208 };
 209
 210 /*
 211  * max8997_muic_set_path - Set hardware line according to attached cable
 212  * @info: the instance including private data of max8997 MUIC
 213  * @value: the path according to attached cable
 214  * @attached: the state of cable (true:attached, false:detached)
 215  *
 216  * The max8997 MUIC device share outside H/W line among a varity of cables,
 217  * so this function set internal path of H/W line according to the type of
 218  * attached cable.
 219  */
 220 static int max8997_muic_set_path(struct max8997_muic_info *info,
 221                 u8 val, bool attached)
 222 {
 223         int ret = 0;
 224         u8 ctrl1, ctrl2 = 0;
 225
 226         if (attached)
 227                 ctrl1 = val;
 228         else
 229                 ctrl1 = CONTROL1_SW_OPEN;
 230
 231         ret = max8997_update_reg(info->muic,
 232                         MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
 233         if (ret < 0) {
 234                 dev_err(info->dev, "failed to update MUIC register\n");
 235                 return ret;
 236         }
 237
 238         if (attached)
 239                 ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
 240         else
 241                 ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
 242
 243         ret = max8997_update_reg(info->muic,
 244                         MAX8997_MUIC_REG_CONTROL2, ctrl2,
 245                         CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
 246         if (ret < 0) {
 247                 dev_err(info->dev, "failed to update MUIC register\n");
 248                 return ret;
 249         }
 250
 251         dev_info(info->dev,
 252                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 253                 ctrl1, ctrl2, attached ? "attached" : "detached");
 254
 255         return 0;
 256 }
 257
 258 /*
 259  * max8997_muic_get_cable_type - Return cable type and check cable state
 260  * @info: the instance including private data of max8997 MUIC
 261  * @group: the path according to attached cable
 262  * @attached: store cable state and return
 263  *
 264  * This function check the cable state either attached or detached,
 265  * and then divide precise type of cable according to cable group.
 266  *      - MAX8997_CABLE_GROUP_ADC
 267  *      - MAX8997_CABLE_GROUP_CHG
 268  */
 269 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
 270                 enum max8997_muic_cable_group group, bool *attached)
 271 {
 272         int cable_type = 0;
 273         int adc;
 274         int chg_type;
 275
 276         switch (group) {
 277         case MAX8997_CABLE_GROUP_ADC:
 278                 /*
 279                  * Read ADC value to check cable type and decide cable state
 280                  * according to cable type
 281                  */
 282                 adc = info->status[0] & STATUS1_ADC_MASK;
 283                 adc >>= STATUS1_ADC_SHIFT;
 284
 285                 /*
 286                  * Check current cable state/cable type and store cable type
 287                  * (info->prev_cable_type) for handling cable when cable is
 288                  * detached.
 289                  */
 290                 if (adc == MAX8997_MUIC_ADC_OPEN) {
 291                         *attached = false;
 292
 293                         cable_type = info->prev_cable_type;
 294                         info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
 295                 } else {
 296                         *attached = true;
 297
 298                         cable_type = info->prev_cable_type = adc;
 299                 }
 300                 break;
 301         case MAX8997_CABLE_GROUP_CHG:
 302                 /*
 303                  * Read charger type to check cable type and decide cable state
 304                  * according to type of charger cable.
 305                  */
 306                 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
 307                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 308
 309                 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
 310                         *attached = false;
 311
 312                         cable_type = info->prev_chg_type;
 313                         info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
 314                 } else {
 315                         *attached = true;
 316
 317                         /*
 318                          * Check current cable state/cable type and store cable
 319                          * type(info->prev_chg_type) for handling cable when
 320                          * charger cable is detached.
 321                          */
 322                         cable_type = info->prev_chg_type = chg_type;
 323                 }
 324
 325                 break;
 326         default:
 327                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 328                 cable_type = -EINVAL;
 329                 break;
 330         }
 331
 332         return cable_type;
 333 }
 334
 335 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 336                         enum max8997_muic_usb_type usb_type, bool attached)
 337 {
 338         int ret = 0;
 339
 340         if (usb_type == MAX8997_USB_HOST) {
 341                 ret = max8997_muic_set_path(info, info->path_usb, attached);
 342                 if (ret < 0) {
 343                         dev_err(info->dev, "failed to update muic register\n");
 344                         return ret;
 345                 }
 346         }
 347
 348         switch (usb_type) {
 349         case MAX8997_USB_HOST:
 350                 extcon_set_cable_state(info->edev, "USB-Host", attached);
 351                 break;
 352         case MAX8997_USB_DEVICE:
 353                 extcon_set_cable_state(info->edev, "USB", attached);
 354                 break;
 355         default:
 356                 dev_err(info->dev, "failed to detect %s usb cable\n",
 357                         attached ? "attached" : "detached");
 358                 return -EINVAL;
 359         }
 360
 361         return 0;
 362 }
 363
 364 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 365                         int cable_type, bool attached)
 366 {
 367         int ret = 0;
 368
 369         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 370         if (ret) {
 371                 dev_err(info->dev, "failed to update muic register\n");
 372                 return ret;
 373         }
 374
 375         switch (cable_type) {
 376         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 377                 extcon_set_cable_state(info->edev, "Dock-desk", attached);
 378                 break;
 379         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 380                 extcon_set_cable_state(info->edev, "Dock-card", attached);
 381                 break;
 382         default:
 383                 dev_err(info->dev, "failed to detect %s dock device\n",
 384                         attached ? "attached" : "detached");
 385                 return -EINVAL;
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 392                         bool attached)
 393 {
 394         int ret = 0;
 395
 396         /* switch to UART */
 397         ret = max8997_muic_set_path(info, info->path_uart, attached);
 398         if (ret) {
 399                 dev_err(info->dev, "failed to update muic register\n");
 400                 return ret;
 401         }
 402
 403         extcon_set_cable_state(info->edev, "JIG", attached);
 404
 405         return 0;
 406 }
 407
 408 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 409 {
 410         int cable_type;
 411         bool attached;
 412         int ret = 0;
 413
 414         /* Check cable state which is either detached or attached */
 415         cable_type = max8997_muic_get_cable_type(info,
 416                                 MAX8997_CABLE_GROUP_ADC, &attached);
 417
 418         switch (cable_type) {
 419         case MAX8997_MUIC_ADC_GROUND:
 420                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 421                 if (ret < 0)
 422                         return ret;
 423                 break;
 424         case MAX8997_MUIC_ADC_MHL:
 425                 extcon_set_cable_state(info->edev, "MHL", attached);
 426                 break;
 427         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 428         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 429                 ret = max8997_muic_handle_usb(info,
 430                                              MAX8997_USB_DEVICE, attached);
 431                 if (ret < 0)
 432                         return ret;
 433                 break;
 434         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 435         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 436                 ret = max8997_muic_handle_dock(info, cable_type, attached);
 437                 if (ret < 0)
 438                         return ret;
 439                 break;
 440         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 441                 ret = max8997_muic_handle_jig_uart(info, attached);
 442                 break;
 443         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 444         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 445         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 446         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 447         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 448         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 449         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 450         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 451         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 452         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 453         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 454         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 455         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 456         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 457         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 458         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 459         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 460         case MAX8997_MUIC_ADC_CEA936_AUDIO:
 461         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 462         case MAX8997_MUIC_ADC_TTY_CONVERTER:
 463         case MAX8997_MUIC_ADC_UART_CABLE:
 464         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 465         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 466         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 467                 /*
 468                  * This cable isn't used in general case if it is specially
 469                  * needed to detect additional cable, should implement
 470                  * proper operation when this cable is attached/detached.
 471                  */
 472                 dev_info(info->dev,
 473                         "cable is %s but it isn't used (type:0x%x)\n",
 474                         attached ? "attached" : "detached", cable_type);
 475                 return -EAGAIN;
 476         default:
 477                 dev_err(info->dev,
 478                         "failed to detect %s unknown cable (type:0x%x)\n",
 479                         attached ? "attached" : "detached", cable_type);
 480                 return -EINVAL;
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 487 {
 488         int chg_type;
 489         bool attached;
 490         int adc;
 491
 492         chg_type = max8997_muic_get_cable_type(info,
 493                                 MAX8997_CABLE_GROUP_CHG, &attached);
 494
 495         switch (chg_type) {
 496         case MAX8997_CHARGER_TYPE_NONE:
 497                 break;
 498         case MAX8997_CHARGER_TYPE_USB:
 499                 adc = info->status[0] & STATUS1_ADC_MASK;
 500                 adc >>= STATUS1_ADC_SHIFT;
 501
 502                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 503                         max8997_muic_handle_usb(info,
 504                                         MAX8997_USB_DEVICE, attached);
 505                 }
 506                 break;
 507         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 508                 extcon_set_cable_state(info->edev,
 509                                       "Charge-downstream", attached);
 510                 break;
 511         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 512                 extcon_set_cable_state(info->edev, "TA", attached);
 513                 break;
 514         case MAX8997_CHARGER_TYPE_500MA:
 515                 extcon_set_cable_state(info->edev, "Slow-charger", attached);
 516                 break;
 517         case MAX8997_CHARGER_TYPE_1A:
 518                 extcon_set_cable_state(info->edev, "Fast-charger", attached);
 519                 break;
 520         default:
 521                 dev_err(info->dev,
 522                         "failed to detect %s unknown chg cable (type:0x%x)\n",
 523                         attached ? "attached" : "detached", chg_type);
 524                 return -EINVAL;
 525         }
 526
 527         return 0;
 528 }
 529
 530 static void max8997_muic_irq_work(struct work_struct *work)
 531 {
 532         struct max8997_muic_info *info = container_of(work,
 533                         struct max8997_muic_info, irq_work);
 534         int irq_type = 0;
 535         int i, ret;
 536
 537         if (!info->edev)
 538                 return;
 539
 540         mutex_lock(&info->mutex);
 541
 542         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 543                 if (info->irq == muic_irqs[i].virq)
 544                         irq_type = muic_irqs[i].irq;
 545
 546         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 547                                 2, info->status);
 548         if (ret) {
 549                 dev_err(info->dev, "failed to read muic register\n");
 550                 mutex_unlock(&info->mutex);
 551                 return;
 552         }
 553
 554         switch (irq_type) {
 555         case MAX8997_MUICIRQ_ADCError:
 556         case MAX8997_MUICIRQ_ADCLow:
 557         case MAX8997_MUICIRQ_ADC:
 558                 /* Handle all of cable except for charger cable */
 559                 ret = max8997_muic_adc_handler(info);
 560                 break;
 561         case MAX8997_MUICIRQ_VBVolt:
 562         case MAX8997_MUICIRQ_DBChg:
 563         case MAX8997_MUICIRQ_DCDTmr:
 564         case MAX8997_MUICIRQ_ChgDetRun:
 565         case MAX8997_MUICIRQ_ChgTyp:
 566                 /* Handle charger cable */
 567                 ret = max8997_muic_chg_handler(info);
 568                 break;
 569         case MAX8997_MUICIRQ_OVP:
 570                 break;
 571         default:
 572                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 573                                 irq_type);
 574                 mutex_unlock(&info->mutex);
 575                 return;
 576         }
 577
 578         if (ret < 0)
 579                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 580
 581         mutex_unlock(&info->mutex);
 582 }
 583
 584 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 585 {
 586         struct max8997_muic_info *info = data;
 587
 588         dev_dbg(info->dev, "irq:%d\n", irq);
 589         info->irq = irq;
 590
 591         schedule_work(&info->irq_work);
 592
 593         return IRQ_HANDLED;
 594 }
 595
 596 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 597 {
 598         int ret = 0;
 599         int adc;
 600         int chg_type;
 601         bool attached;
 602
 603         mutex_lock(&info->mutex);
 604
 605         /* Read STATUSx register to detect accessory */
 606         ret = max8997_bulk_read(info->muic,
 607                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
 608         if (ret) {
 609                 dev_err(info->dev, "failed to read MUIC register\n");
 610                 mutex_unlock(&info->mutex);
 611                 return ret;
 612         }
 613
 614         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 615                                         &attached);
 616         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 617                 ret = max8997_muic_adc_handler(info);
 618                 if (ret < 0) {
 619                         dev_err(info->dev, "Cannot detect ADC cable\n");
 620                         mutex_unlock(&info->mutex);
 621                         return ret;
 622                 }
 623         }
 624
 625         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 626                                         &attached);
 627         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 628                 ret = max8997_muic_chg_handler(info);
 629                 if (ret < 0) {
 630                         dev_err(info->dev, "Cannot detect charger cable\n");
 631                         mutex_unlock(&info->mutex);
 632                         return ret;
 633                 }
 634         }
 635
 636         mutex_unlock(&info->mutex);
 637
 638         return 0;
 639 }
 640
 641 static void max8997_muic_detect_cable_wq(struct work_struct *work)
 642 {
 643         struct max8997_muic_info *info = container_of(to_delayed_work(work),
 644                                 struct max8997_muic_info, wq_detcable);
 645         int ret;
 646
 647         ret = max8997_muic_detect_dev(info);
 648         if (ret < 0)
 649                 dev_err(info->dev, "failed to detect cable type\n");
 650 }
 651
 652 static int max8997_muic_probe(struct platform_device *pdev)
 653 {
 654         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 655         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 656         struct max8997_muic_info *info;
 657         int delay_jiffies;
 658         int ret, i;
 659
 660         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 661                             GFP_KERNEL);
 662         if (!info)
 663                 return -ENOMEM;
 664
 665         info->dev = &pdev->dev;
 666         info->muic = max8997->muic;
 667
 668         platform_set_drvdata(pdev, info);
 669         mutex_init(&info->mutex);
 670
 671         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 672
 673         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 674                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 675                 unsigned int virq = 0;
 676
 677                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 678                 if (!virq) {
 679                         ret = -EINVAL;
 680                         goto err_irq;
 681                 }
 682                 muic_irq->virq = virq;
 683
 684                 ret = request_threaded_irq(virq, NULL,
 685                                 max8997_muic_irq_handler,
 686                                 IRQF_NO_SUSPEND,
 687                                 muic_irq->name, info);
 688                 if (ret) {
 689                         dev_err(&pdev->dev,
 690                                 "failed: irq request (IRQ: %d, error :%d)\n",
 691                                 muic_irq->irq, ret);
 692                         goto err_irq;
 693                 }
 694         }
 695
 696         /* External connector */
 697         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 698         if (IS_ERR(info->edev)) {
 699                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 700                 ret = -ENOMEM;
 701                 goto err_irq;
 702         }
 703         info->edev->name = DEV_NAME;
 704
 705         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 706         if (ret) {
 707                 dev_err(&pdev->dev, "failed to register extcon device\n");
 708                 goto err_irq;
 709         }
 710
 711         if (pdata && pdata->muic_pdata) {
 712                 struct max8997_muic_platform_data *muic_pdata
 713                         = pdata->muic_pdata;
 714
 715                 /* Initialize registers according to platform data */
 716                 for (i = 0; i < muic_pdata->num_init_data; i++) {
 717                         max8997_write_reg(info->muic,
 718                                         muic_pdata->init_data[i].addr,
 719                                         muic_pdata->init_data[i].data);
 720                 }
 721
 722                 /*
 723                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 724                  * h/w path of COMP2/COMN1 on CONTROL1 register.
 725                  */
 726                 if (muic_pdata->path_uart)
 727                         info->path_uart = muic_pdata->path_uart;
 728                 else
 729                         info->path_uart = CONTROL1_SW_UART;
 730
 731                 if (muic_pdata->path_usb)
 732                         info->path_usb = muic_pdata->path_usb;
 733                 else
 734                         info->path_usb = CONTROL1_SW_USB;
 735
 736                 /*
 737                  * Default delay time for detecting cable state
 738                  * after certain time.
 739                  */
 740                 if (muic_pdata->detcable_delay_ms)
 741                         delay_jiffies =
 742                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 743                 else
 744                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 745         } else {
 746                 info->path_uart = CONTROL1_SW_UART;
 747                 info->path_usb = CONTROL1_SW_USB;
 748                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 749         }
 750
 751         /* Set initial path for UART */
 752          max8997_muic_set_path(info, info->path_uart, true);
 753
 754         /* Set ADC debounce time */
 755         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 756
 757         /*
 758          * Detect accessory after completing the initialization of platform
 759          *
 760          * - Use delayed workqueue to detect cable state and then
 761          * notify cable state to notifiee/platform through uevent.
 762          * After completing the booting of platform, the extcon provider
 763          * driver should notify cable state to upper layer.
 764          */
 765         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 766         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 767                         delay_jiffies);
 768
 769         return 0;
 770
 771 err_irq:
 772         while (--i >= 0)
 773                 free_irq(muic_irqs[i].virq, info);
 774         return ret;
 775 }
 776
 777 static int max8997_muic_remove(struct platform_device *pdev)
 778 {
 779         struct max8997_muic_info *info = platform_get_drvdata(pdev);
 780         int i;
 781
 782         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 783                 free_irq(muic_irqs[i].virq, info);
 784         cancel_work_sync(&info->irq_work);
 785
 786         return 0;
 787 }
 788
 789 static struct platform_driver max8997_muic_driver = {
 790         .driver         = {
 791                 .name   = DEV_NAME,
 792         },
 793         .probe          = max8997_muic_probe,
 794         .remove         = max8997_muic_remove,
 795 };
 796
 797 module_platform_driver(max8997_muic_driver);
 798
 799 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 800 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 801 MODULE_LICENSE("GPL");