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