drivers/extcon/extcon-max8997.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
   4 //
   5 //  Copyright (C) 2012 Samsung Electronics
   6 //  Donggeun Kim <[email protected]>
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/i2c.h>
  11 #include <linux/slab.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/kobject.h>
  16 #include <linux/mfd/max8997.h>
  17 #include <linux/mfd/max8997-private.h>
  18 #include <linux/extcon-provider.h>
  19 #include <linux/irqdomain.h>
  20
  21 #define DEV_NAME                        "max8997-muic"
  22 #define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
  23
  24 enum max8997_muic_adc_debounce_time {
  25         ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
  26         ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
  27         ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
  28         ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
  29 };
  30
  31 struct max8997_muic_irq {
  32         unsigned int irq;
  33         const char *name;
  34         unsigned int virq;
  35 };
  36
  37 static struct max8997_muic_irq muic_irqs[] = {
  38         { MAX8997_MUICIRQ_ADCError,     "muic-ADCERROR" },
  39         { MAX8997_MUICIRQ_ADCLow,       "muic-ADCLOW" },
  40         { MAX8997_MUICIRQ_ADC,          "muic-ADC" },
  41         { MAX8997_MUICIRQ_VBVolt,       "muic-VBVOLT" },
  42         { MAX8997_MUICIRQ_DBChg,        "muic-DBCHG" },
  43         { MAX8997_MUICIRQ_DCDTmr,       "muic-DCDTMR" },
  44         { MAX8997_MUICIRQ_ChgDetRun,    "muic-CHGDETRUN" },
  45         { MAX8997_MUICIRQ_ChgTyp,       "muic-CHGTYP" },
  46         { MAX8997_MUICIRQ_OVP,          "muic-OVP" },
  47         { MAX8997_PMICIRQ_CHGINS,       "pmic-CHGINS" },
  48         { MAX8997_PMICIRQ_CHGRM,        "pmic-CHGRM" },
  49 };
  50
  51 /* Define supported cable type */
  52 enum max8997_muic_acc_type {
  53         MAX8997_MUIC_ADC_GROUND = 0x0,
  54         MAX8997_MUIC_ADC_MHL,                   /* MHL*/
  55         MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
  56         MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
  57         MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
  58         MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
  59         MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
  60         MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
  61         MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
  62         MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
  63         MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
  64         MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
  65         MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
  66         MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
  67         MAX8997_MUIC_ADC_RESERVED_ACC_1,
  68         MAX8997_MUIC_ADC_RESERVED_ACC_2,
  69         MAX8997_MUIC_ADC_RESERVED_ACC_3,
  70         MAX8997_MUIC_ADC_RESERVED_ACC_4,
  71         MAX8997_MUIC_ADC_RESERVED_ACC_5,
  72         MAX8997_MUIC_ADC_CEA936_AUDIO,
  73         MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
  74         MAX8997_MUIC_ADC_TTY_CONVERTER,
  75         MAX8997_MUIC_ADC_UART_CABLE,
  76         MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
  77         MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,  /* JIG-USB-OFF */
  78         MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,   /* JIG-USB-ON */
  79         MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,       /* DESKDOCK */
  80         MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
  81         MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
  82         MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,  /* CARDOCK */
  83         MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
  84         MAX8997_MUIC_ADC_OPEN,                  /* OPEN */
  85 };
  86
  87 enum max8997_muic_cable_group {
  88         MAX8997_CABLE_GROUP_ADC = 0,
  89         MAX8997_CABLE_GROUP_ADC_GND,
  90         MAX8997_CABLE_GROUP_CHG,
  91         MAX8997_CABLE_GROUP_VBVOLT,
  92 };
  93
  94 enum max8997_muic_usb_type {
  95         MAX8997_USB_HOST,
  96         MAX8997_USB_DEVICE,
  97 };
  98
  99 enum max8997_muic_charger_type {
 100         MAX8997_CHARGER_TYPE_NONE = 0,
 101         MAX8997_CHARGER_TYPE_USB,
 102         MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
 103         MAX8997_CHARGER_TYPE_DEDICATED_CHG,
 104         MAX8997_CHARGER_TYPE_500MA,
 105         MAX8997_CHARGER_TYPE_1A,
 106         MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
 107 };
 108
 109 struct max8997_muic_info {
 110         struct device *dev;
 111         struct i2c_client *muic;
 112         struct extcon_dev *edev;
 113         int prev_cable_type;
 114         int prev_chg_type;
 115         u8 status[2];
 116
 117         int irq;
 118         struct work_struct irq_work;
 119         struct mutex mutex;
 120
 121         struct max8997_muic_platform_data *muic_pdata;
 122         enum max8997_muic_charger_type pre_charger_type;
 123
 124         /*
 125          * Use delayed workqueue to detect cable state and then
 126          * notify cable state to notifiee/platform through uevent.
 127          * After completing the booting of platform, the extcon provider
 128          * driver should notify cable state to upper layer.
 129          */
 130         struct delayed_work wq_detcable;
 131
 132         /*
 133          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 134          * h/w path of COMP2/COMN1 on CONTROL1 register.
 135          */
 136         int path_usb;
 137         int path_uart;
 138 };
 139
 140 static const unsigned int max8997_extcon_cable[] = {
 141         EXTCON_USB,
 142         EXTCON_USB_HOST,
 143         EXTCON_CHG_USB_SDP,
 144         EXTCON_CHG_USB_DCP,
 145         EXTCON_CHG_USB_FAST,
 146         EXTCON_CHG_USB_SLOW,
 147         EXTCON_CHG_USB_CDP,
 148         EXTCON_DISP_MHL,
 149         EXTCON_DOCK,
 150         EXTCON_JIG,
 151         EXTCON_NONE,
 152 };
 153
 154 /*
 155  * max8997_muic_set_debounce_time - Set the debounce time of ADC
 156  * @info: the instance including private data of max8997 MUIC
 157  * @time: the debounce time of ADC
 158  */
 159 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
 160                 enum max8997_muic_adc_debounce_time time)
 161 {
 162         int ret;
 163
 164         switch (time) {
 165         case ADC_DEBOUNCE_TIME_0_5MS:
 166         case ADC_DEBOUNCE_TIME_10MS:
 167         case ADC_DEBOUNCE_TIME_25MS:
 168         case ADC_DEBOUNCE_TIME_38_62MS:
 169                 ret = max8997_update_reg(info->muic,
 170                                           MAX8997_MUIC_REG_CONTROL3,
 171                                           time << CONTROL3_ADCDBSET_SHIFT,
 172                                           CONTROL3_ADCDBSET_MASK);
 173                 if (ret) {
 174                         dev_err(info->dev, "failed to set ADC debounce time\n");
 175                         return ret;
 176                 }
 177                 break;
 178         default:
 179                 dev_err(info->dev, "invalid ADC debounce time\n");
 180                 return -EINVAL;
 181         }
 182
 183         return 0;
 184 };
 185
 186 /*
 187  * max8997_muic_set_path - Set hardware line according to attached cable
 188  * @info: the instance including private data of max8997 MUIC
 189  * @value: the path according to attached cable
 190  * @attached: the state of cable (true:attached, false:detached)
 191  *
 192  * The max8997 MUIC device share outside H/W line among a varity of cables,
 193  * so this function set internal path of H/W line according to the type of
 194  * attached cable.
 195  */
 196 static int max8997_muic_set_path(struct max8997_muic_info *info,
 197                 u8 val, bool attached)
 198 {
 199         int ret;
 200         u8 ctrl1, ctrl2 = 0;
 201
 202         if (attached)
 203                 ctrl1 = val;
 204         else
 205                 ctrl1 = CONTROL1_SW_OPEN;
 206
 207         ret = max8997_update_reg(info->muic,
 208                         MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
 209         if (ret < 0) {
 210                 dev_err(info->dev, "failed to update MUIC register\n");
 211                 return ret;
 212         }
 213
 214         if (attached)
 215                 ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
 216         else
 217                 ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
 218
 219         ret = max8997_update_reg(info->muic,
 220                         MAX8997_MUIC_REG_CONTROL2, ctrl2,
 221                         CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
 222         if (ret < 0) {
 223                 dev_err(info->dev, "failed to update MUIC register\n");
 224                 return ret;
 225         }
 226
 227         dev_info(info->dev,
 228                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 229                 ctrl1, ctrl2, attached ? "attached" : "detached");
 230
 231         return 0;
 232 }
 233
 234 /*
 235  * max8997_muic_get_cable_type - Return cable type and check cable state
 236  * @info: the instance including private data of max8997 MUIC
 237  * @group: the path according to attached cable
 238  * @attached: store cable state and return
 239  *
 240  * This function check the cable state either attached or detached,
 241  * and then divide precise type of cable according to cable group.
 242  *      - MAX8997_CABLE_GROUP_ADC
 243  *      - MAX8997_CABLE_GROUP_CHG
 244  */
 245 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
 246                 enum max8997_muic_cable_group group, bool *attached)
 247 {
 248         int cable_type = 0;
 249         int adc;
 250         int chg_type;
 251
 252         switch (group) {
 253         case MAX8997_CABLE_GROUP_ADC:
 254                 /*
 255                  * Read ADC value to check cable type and decide cable state
 256                  * according to cable type
 257                  */
 258                 adc = info->status[0] & STATUS1_ADC_MASK;
 259                 adc >>= STATUS1_ADC_SHIFT;
 260
 261                 /*
 262                  * Check current cable state/cable type and store cable type
 263                  * (info->prev_cable_type) for handling cable when cable is
 264                  * detached.
 265                  */
 266                 if (adc == MAX8997_MUIC_ADC_OPEN) {
 267                         *attached = false;
 268
 269                         cable_type = info->prev_cable_type;
 270                         info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
 271                 } else {
 272                         *attached = true;
 273
 274                         cable_type = info->prev_cable_type = adc;
 275                 }
 276                 break;
 277         case MAX8997_CABLE_GROUP_CHG:
 278                 /*
 279                  * Read charger type to check cable type and decide cable state
 280                  * according to type of charger cable.
 281                  */
 282                 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
 283                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 284
 285                 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
 286                         *attached = false;
 287
 288                         cable_type = info->prev_chg_type;
 289                         info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
 290                 } else {
 291                         *attached = true;
 292
 293                         /*
 294                          * Check current cable state/cable type and store cable
 295                          * type(info->prev_chg_type) for handling cable when
 296                          * charger cable is detached.
 297                          */
 298                         cable_type = info->prev_chg_type = chg_type;
 299                 }
 300
 301                 break;
 302         default:
 303                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 304                 cable_type = -EINVAL;
 305                 break;
 306         }
 307
 308         return cable_type;
 309 }
 310
 311 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 312                         enum max8997_muic_usb_type usb_type, bool attached)
 313 {
 314         int ret = 0;
 315
 316         ret = max8997_muic_set_path(info, info->path_usb, attached);
 317         if (ret < 0) {
 318                 dev_err(info->dev, "failed to update muic register\n");
 319                 return ret;
 320         }
 321
 322         switch (usb_type) {
 323         case MAX8997_USB_HOST:
 324                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
 325                 break;
 326         case MAX8997_USB_DEVICE:
 327                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
 328                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 329                                         attached);
 330                 break;
 331         default:
 332                 dev_err(info->dev, "failed to detect %s usb cable\n",
 333                         attached ? "attached" : "detached");
 334                 return -EINVAL;
 335         }
 336
 337         return 0;
 338 }
 339
 340 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 341                         int cable_type, bool attached)
 342 {
 343         int ret = 0;
 344
 345         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 346         if (ret) {
 347                 dev_err(info->dev, "failed to update muic register\n");
 348                 return ret;
 349         }
 350
 351         switch (cable_type) {
 352         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 353         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 354                 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
 355                 break;
 356         default:
 357                 dev_err(info->dev, "failed to detect %s dock device\n",
 358                         attached ? "attached" : "detached");
 359                 return -EINVAL;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 366                         bool attached)
 367 {
 368         int ret = 0;
 369
 370         /* switch to UART */
 371         ret = max8997_muic_set_path(info, info->path_uart, attached);
 372         if (ret) {
 373                 dev_err(info->dev, "failed to update muic register\n");
 374                 return ret;
 375         }
 376
 377         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
 378
 379         return 0;
 380 }
 381
 382 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 383 {
 384         int cable_type;
 385         bool attached;
 386         int ret = 0;
 387
 388         /* Check cable state which is either detached or attached */
 389         cable_type = max8997_muic_get_cable_type(info,
 390                                 MAX8997_CABLE_GROUP_ADC, &attached);
 391
 392         switch (cable_type) {
 393         case MAX8997_MUIC_ADC_GROUND:
 394                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 395                 if (ret < 0)
 396                         return ret;
 397                 break;
 398         case MAX8997_MUIC_ADC_MHL:
 399                 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
 400                 break;
 401         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 402         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 403                 ret = max8997_muic_handle_usb(info,
 404                                              MAX8997_USB_DEVICE, attached);
 405                 if (ret < 0)
 406                         return ret;
 407                 break;
 408         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 409         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 410                 ret = max8997_muic_handle_dock(info, cable_type, attached);
 411                 if (ret < 0)
 412                         return ret;
 413                 break;
 414         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 415                 ret = max8997_muic_handle_jig_uart(info, attached);
 416                 break;
 417         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 418         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 419         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 420         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 421         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 422         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 423         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 424         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 425         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 426         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 427         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 428         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 429         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 430         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 431         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 432         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 433         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 434         case MAX8997_MUIC_ADC_CEA936_AUDIO:
 435         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 436         case MAX8997_MUIC_ADC_TTY_CONVERTER:
 437         case MAX8997_MUIC_ADC_UART_CABLE:
 438         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 439         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 440         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 441                 /*
 442                  * This cable isn't used in general case if it is specially
 443                  * needed to detect additional cable, should implement
 444                  * proper operation when this cable is attached/detached.
 445                  */
 446                 dev_info(info->dev,
 447                         "cable is %s but it isn't used (type:0x%x)\n",
 448                         attached ? "attached" : "detached", cable_type);
 449                 return -EAGAIN;
 450         default:
 451                 dev_err(info->dev,
 452                         "failed to detect %s unknown cable (type:0x%x)\n",
 453                         attached ? "attached" : "detached", cable_type);
 454                 return -EINVAL;
 455         }
 456
 457         return 0;
 458 }
 459
 460 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 461 {
 462         int chg_type;
 463         bool attached;
 464         int adc;
 465
 466         chg_type = max8997_muic_get_cable_type(info,
 467                                 MAX8997_CABLE_GROUP_CHG, &attached);
 468
 469         switch (chg_type) {
 470         case MAX8997_CHARGER_TYPE_NONE:
 471                 break;
 472         case MAX8997_CHARGER_TYPE_USB:
 473                 adc = info->status[0] & STATUS1_ADC_MASK;
 474                 adc >>= STATUS1_ADC_SHIFT;
 475
 476                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 477                         max8997_muic_handle_usb(info,
 478                                         MAX8997_USB_DEVICE, attached);
 479                 }
 480                 break;
 481         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 482                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
 483                                         attached);
 484                 break;
 485         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 486                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 487                                         attached);
 488                 break;
 489         case MAX8997_CHARGER_TYPE_500MA:
 490                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
 491                                         attached);
 492                 break;
 493         case MAX8997_CHARGER_TYPE_1A:
 494                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
 495                                         attached);
 496                 break;
 497         default:
 498                 dev_err(info->dev,
 499                         "failed to detect %s unknown chg cable (type:0x%x)\n",
 500                         attached ? "attached" : "detached", chg_type);
 501                 return -EINVAL;
 502         }
 503
 504         return 0;
 505 }
 506
 507 static void max8997_muic_irq_work(struct work_struct *work)
 508 {
 509         struct max8997_muic_info *info = container_of(work,
 510                         struct max8997_muic_info, irq_work);
 511         int irq_type = 0;
 512         int i, ret;
 513
 514         if (!info->edev)
 515                 return;
 516
 517         mutex_lock(&info->mutex);
 518
 519         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 520                 if (info->irq == muic_irqs[i].virq)
 521                         irq_type = muic_irqs[i].irq;
 522
 523         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 524                                 2, info->status);
 525         if (ret) {
 526                 dev_err(info->dev, "failed to read muic register\n");
 527                 mutex_unlock(&info->mutex);
 528                 return;
 529         }
 530
 531         switch (irq_type) {
 532         case MAX8997_MUICIRQ_ADCError:
 533         case MAX8997_MUICIRQ_ADCLow:
 534         case MAX8997_MUICIRQ_ADC:
 535                 /* Handle all of cable except for charger cable */
 536                 ret = max8997_muic_adc_handler(info);
 537                 break;
 538         case MAX8997_MUICIRQ_VBVolt:
 539         case MAX8997_MUICIRQ_DBChg:
 540         case MAX8997_MUICIRQ_DCDTmr:
 541         case MAX8997_MUICIRQ_ChgDetRun:
 542         case MAX8997_MUICIRQ_ChgTyp:
 543         case MAX8997_PMICIRQ_CHGINS:
 544         case MAX8997_PMICIRQ_CHGRM:
 545                 /* Handle charger cable */
 546                 ret = max8997_muic_chg_handler(info);
 547                 break;
 548         case MAX8997_MUICIRQ_OVP:
 549                 break;
 550         default:
 551                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 552                                 irq_type);
 553                 mutex_unlock(&info->mutex);
 554                 return;
 555         }
 556
 557         if (ret < 0)
 558                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 559
 560         mutex_unlock(&info->mutex);
 561 }
 562
 563 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 564 {
 565         struct max8997_muic_info *info = data;
 566
 567         dev_dbg(info->dev, "irq:%d\n", irq);
 568         info->irq = irq;
 569
 570         schedule_work(&info->irq_work);
 571
 572         return IRQ_HANDLED;
 573 }
 574
 575 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 576 {
 577         int ret = 0;
 578         int adc;
 579         int chg_type;
 580         bool attached;
 581
 582         mutex_lock(&info->mutex);
 583
 584         /* Read STATUSx register to detect accessory */
 585         ret = max8997_bulk_read(info->muic,
 586                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
 587         if (ret) {
 588                 dev_err(info->dev, "failed to read MUIC register\n");
 589                 mutex_unlock(&info->mutex);
 590                 return ret;
 591         }
 592
 593         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 594                                         &attached);
 595         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 596                 ret = max8997_muic_adc_handler(info);
 597                 if (ret < 0) {
 598                         dev_err(info->dev, "Cannot detect ADC cable\n");
 599                         mutex_unlock(&info->mutex);
 600                         return ret;
 601                 }
 602         }
 603
 604         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 605                                         &attached);
 606         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 607                 ret = max8997_muic_chg_handler(info);
 608                 if (ret < 0) {
 609                         dev_err(info->dev, "Cannot detect charger cable\n");
 610                         mutex_unlock(&info->mutex);
 611                         return ret;
 612                 }
 613         }
 614
 615         mutex_unlock(&info->mutex);
 616
 617         return 0;
 618 }
 619
 620 static void max8997_muic_detect_cable_wq(struct work_struct *work)
 621 {
 622         struct max8997_muic_info *info = container_of(to_delayed_work(work),
 623                                 struct max8997_muic_info, wq_detcable);
 624         int ret;
 625
 626         ret = max8997_muic_detect_dev(info);
 627         if (ret < 0)
 628                 dev_err(info->dev, "failed to detect cable type\n");
 629 }
 630
 631 static int max8997_muic_probe(struct platform_device *pdev)
 632 {
 633         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 634         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 635         struct max8997_muic_info *info;
 636         int delay_jiffies;
 637         int cable_type;
 638         bool attached;
 639         int ret, i;
 640
 641         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 642                             GFP_KERNEL);
 643         if (!info)
 644                 return -ENOMEM;
 645
 646         info->dev = &pdev->dev;
 647         info->muic = max8997->muic;
 648
 649         platform_set_drvdata(pdev, info);
 650         mutex_init(&info->mutex);
 651
 652         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 653
 654         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 655                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 656                 unsigned int virq = 0;
 657
 658                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 659                 if (!virq) {
 660                         ret = -EINVAL;
 661                         goto err_irq;
 662                 }
 663                 muic_irq->virq = virq;
 664
 665                 ret = request_threaded_irq(virq, NULL,
 666                                 max8997_muic_irq_handler,
 667                                 IRQF_NO_SUSPEND,
 668                                 muic_irq->name, info);
 669                 if (ret) {
 670                         dev_err(&pdev->dev,
 671                                 "failed: irq request (IRQ: %d, error :%d)\n",
 672                                 muic_irq->irq, ret);
 673                         goto err_irq;
 674                 }
 675         }
 676
 677         /* External connector */
 678         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 679         if (IS_ERR(info->edev)) {
 680                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 681                 ret = PTR_ERR(info->edev);
 682                 goto err_irq;
 683         }
 684
 685         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 686         if (ret) {
 687                 dev_err(&pdev->dev, "failed to register extcon device\n");
 688                 goto err_irq;
 689         }
 690
 691         if (pdata && pdata->muic_pdata) {
 692                 struct max8997_muic_platform_data *muic_pdata
 693                         = pdata->muic_pdata;
 694
 695                 /* Initialize registers according to platform data */
 696                 for (i = 0; i < muic_pdata->num_init_data; i++) {
 697                         max8997_write_reg(info->muic,
 698                                         muic_pdata->init_data[i].addr,
 699                                         muic_pdata->init_data[i].data);
 700                 }
 701
 702                 /*
 703                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 704                  * h/w path of COMP2/COMN1 on CONTROL1 register.
 705                  */
 706                 if (muic_pdata->path_uart)
 707                         info->path_uart = muic_pdata->path_uart;
 708                 else
 709                         info->path_uart = CONTROL1_SW_UART;
 710
 711                 if (muic_pdata->path_usb)
 712                         info->path_usb = muic_pdata->path_usb;
 713                 else
 714                         info->path_usb = CONTROL1_SW_USB;
 715
 716                 /*
 717                  * Default delay time for detecting cable state
 718                  * after certain time.
 719                  */
 720                 if (muic_pdata->detcable_delay_ms)
 721                         delay_jiffies =
 722                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 723                 else
 724                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 725         } else {
 726                 info->path_uart = CONTROL1_SW_UART;
 727                 info->path_usb = CONTROL1_SW_USB;
 728                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 729         }
 730
 731         /* Set initial path for UART when JIG is connected to get serial logs */
 732         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 733                                 2, info->status);
 734         if (ret) {
 735                 dev_err(info->dev, "failed to read MUIC register\n");
 736                 return ret;
 737         }
 738         cable_type = max8997_muic_get_cable_type(info,
 739                                            MAX8997_CABLE_GROUP_ADC, &attached);
 740         if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
 741                 max8997_muic_set_path(info, info->path_uart, true);
 742
 743         /* Set ADC debounce time */
 744         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 745
 746         /*
 747          * Detect accessory after completing the initialization of platform
 748          *
 749          * - Use delayed workqueue to detect cable state and then
 750          * notify cable state to notifiee/platform through uevent.
 751          * After completing the booting of platform, the extcon provider
 752          * driver should notify cable state to upper layer.
 753          */
 754         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 755         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 756                         delay_jiffies);
 757
 758         return 0;
 759
 760 err_irq:
 761         while (--i >= 0)
 762                 free_irq(muic_irqs[i].virq, info);
 763         return ret;
 764 }
 765
 766 static int max8997_muic_remove(struct platform_device *pdev)
 767 {
 768         struct max8997_muic_info *info = platform_get_drvdata(pdev);
 769         int i;
 770
 771         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 772                 free_irq(muic_irqs[i].virq, info);
 773         cancel_work_sync(&info->irq_work);
 774
 775         return 0;
 776 }
 777
 778 static struct platform_driver max8997_muic_driver = {
 779         .driver         = {
 780                 .name   = DEV_NAME,
 781         },
 782         .probe          = max8997_muic_probe,
 783         .remove         = max8997_muic_remove,
 784 };
 785
 786 module_platform_driver(max8997_muic_driver);
 787
 788 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 789 MODULE_AUTHOR("Donggeun Kim <[email protected]>");
 790 MODULE_LICENSE("GPL");