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 <dg77.kim@samsung.com>
   7
   8 #include <linux/devm-helpers.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/i2c.h>
  12 #include <linux/slab.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/err.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/kobject.h>
  17 #include <linux/mfd/max8997.h>
  18 #include <linux/mfd/max8997-private.h>
  19 #include <linux/extcon-provider.h>
  20 #include <linux/irqdomain.h>
  21
  22 #define DEV_NAME                        "max8997-muic"
  23 #define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
  24
  25 enum max8997_muic_adc_debounce_time {
  26         ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
  27         ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
  28         ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
  29         ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
  30 };
  31
  32 struct max8997_muic_irq {
  33         unsigned int irq;
  34         const char *name;
  35         unsigned int virq;
  36 };
  37
  38 static struct max8997_muic_irq muic_irqs[] = {
  39         { MAX8997_MUICIRQ_ADCError,     "muic-ADCERROR" },
  40         { MAX8997_MUICIRQ_ADCLow,       "muic-ADCLOW" },
  41         { MAX8997_MUICIRQ_ADC,          "muic-ADC" },
  42         { MAX8997_MUICIRQ_VBVolt,       "muic-VBVOLT" },
  43         { MAX8997_MUICIRQ_DBChg,        "muic-DBCHG" },
  44         { MAX8997_MUICIRQ_DCDTmr,       "muic-DCDTMR" },
  45         { MAX8997_MUICIRQ_ChgDetRun,    "muic-CHGDETRUN" },
  46         { MAX8997_MUICIRQ_ChgTyp,       "muic-CHGTYP" },
  47         { MAX8997_MUICIRQ_OVP,          "muic-OVP" },
  48         { MAX8997_PMICIRQ_CHGINS,       "pmic-CHGINS" },
  49         { MAX8997_PMICIRQ_CHGRM,        "pmic-CHGRM" },
  50 };
  51
  52 /* Define supported cable type */
  53 enum max8997_muic_acc_type {
  54         MAX8997_MUIC_ADC_GROUND = 0x0,
  55         MAX8997_MUIC_ADC_MHL,                   /* MHL*/
  56         MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
  57         MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
  58         MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
  59         MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
  60         MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
  61         MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
  62         MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
  63         MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
  64         MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
  65         MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
  66         MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
  67         MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
  68         MAX8997_MUIC_ADC_RESERVED_ACC_1,
  69         MAX8997_MUIC_ADC_RESERVED_ACC_2,
  70         MAX8997_MUIC_ADC_RESERVED_ACC_3,
  71         MAX8997_MUIC_ADC_RESERVED_ACC_4,
  72         MAX8997_MUIC_ADC_RESERVED_ACC_5,
  73         MAX8997_MUIC_ADC_CEA936_AUDIO,
  74         MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
  75         MAX8997_MUIC_ADC_TTY_CONVERTER,
  76         MAX8997_MUIC_ADC_UART_CABLE,
  77         MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
  78         MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,  /* JIG-USB-OFF */
  79         MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,   /* JIG-USB-ON */
  80         MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,       /* DESKDOCK */
  81         MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
  82         MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
  83         MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,  /* CARDOCK */
  84         MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
  85         MAX8997_MUIC_ADC_OPEN,                  /* OPEN */
  86 };
  87
  88 enum max8997_muic_cable_group {
  89         MAX8997_CABLE_GROUP_ADC = 0,
  90         MAX8997_CABLE_GROUP_ADC_GND,
  91         MAX8997_CABLE_GROUP_CHG,
  92         MAX8997_CABLE_GROUP_VBVOLT,
  93 };
  94
  95 enum max8997_muic_usb_type {
  96         MAX8997_USB_HOST,
  97         MAX8997_USB_DEVICE,
  98 };
  99
 100 enum max8997_muic_charger_type {
 101         MAX8997_CHARGER_TYPE_NONE = 0,
 102         MAX8997_CHARGER_TYPE_USB,
 103         MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
 104         MAX8997_CHARGER_TYPE_DEDICATED_CHG,
 105         MAX8997_CHARGER_TYPE_500MA,
 106         MAX8997_CHARGER_TYPE_1A,
 107         MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
 108 };
 109
 110 struct max8997_muic_info {
 111         struct device *dev;
 112         struct i2c_client *muic;
 113         struct extcon_dev *edev;
 114         int prev_cable_type;
 115         int prev_chg_type;
 116         u8 status[2];
 117
 118         int irq;
 119         struct work_struct irq_work;
 120         struct mutex mutex;
 121
 122         struct max8997_muic_platform_data *muic_pdata;
 123         enum max8997_muic_charger_type pre_charger_type;
 124
 125         /*
 126          * Use delayed workqueue to detect cable state and then
 127          * notify cable state to notifiee/platform through uevent.
 128          * After completing the booting of platform, the extcon provider
 129          * driver should notify cable state to upper layer.
 130          */
 131         struct delayed_work wq_detcable;
 132
 133         /*
 134          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 135          * h/w path of COMP2/COMN1 on CONTROL1 register.
 136          */
 137         int path_usb;
 138         int path_uart;
 139 };
 140
 141 static const unsigned int max8997_extcon_cable[] = {
 142         EXTCON_USB,
 143         EXTCON_USB_HOST,
 144         EXTCON_CHG_USB_SDP,
 145         EXTCON_CHG_USB_DCP,
 146         EXTCON_CHG_USB_FAST,
 147         EXTCON_CHG_USB_SLOW,
 148         EXTCON_CHG_USB_CDP,
 149         EXTCON_DISP_MHL,
 150         EXTCON_DOCK,
 151         EXTCON_JIG,
 152         EXTCON_NONE,
 153 };
 154
 155 /*
 156  * max8997_muic_set_debounce_time - Set the debounce time of ADC
 157  * @info: the instance including private data of max8997 MUIC
 158  * @time: the debounce time of ADC
 159  */
 160 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
 161                 enum max8997_muic_adc_debounce_time time)
 162 {
 163         int ret;
 164
 165         switch (time) {
 166         case ADC_DEBOUNCE_TIME_0_5MS:
 167         case ADC_DEBOUNCE_TIME_10MS:
 168         case ADC_DEBOUNCE_TIME_25MS:
 169         case ADC_DEBOUNCE_TIME_38_62MS:
 170                 ret = max8997_update_reg(info->muic,
 171                                           MAX8997_MUIC_REG_CONTROL3,
 172                                           time << CONTROL3_ADCDBSET_SHIFT,
 173                                           CONTROL3_ADCDBSET_MASK);
 174                 if (ret) {
 175                         dev_err(info->dev, "failed to set ADC debounce time\n");
 176                         return ret;
 177                 }
 178                 break;
 179         default:
 180                 dev_err(info->dev, "invalid ADC debounce time\n");
 181                 return -EINVAL;
 182         }
 183
 184         return 0;
 185 };
 186
 187 /*
 188  * max8997_muic_set_path - Set hardware line according to attached cable
 189  * @info: the instance including private data of max8997 MUIC
 190  * @value: the path according to attached cable
 191  * @attached: the state of cable (true:attached, false:detached)
 192  *
 193  * The max8997 MUIC device share outside H/W line among a varity of cables,
 194  * so this function set internal path of H/W line according to the type of
 195  * attached cable.
 196  */
 197 static int max8997_muic_set_path(struct max8997_muic_info *info,
 198                 u8 val, bool attached)
 199 {
 200         int ret;
 201         u8 ctrl1, ctrl2 = 0;
 202
 203         if (attached)
 204                 ctrl1 = val;
 205         else
 206                 ctrl1 = CONTROL1_SW_OPEN;
 207
 208         ret = max8997_update_reg(info->muic,
 209                         MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
 210         if (ret < 0) {
 211                 dev_err(info->dev, "failed to update MUIC register\n");
 212                 return ret;
 213         }
 214
 215         if (attached)
 216                 ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
 217         else
 218                 ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
 219
 220         ret = max8997_update_reg(info->muic,
 221                         MAX8997_MUIC_REG_CONTROL2, ctrl2,
 222                         CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
 223         if (ret < 0) {
 224                 dev_err(info->dev, "failed to update MUIC register\n");
 225                 return ret;
 226         }
 227
 228         dev_info(info->dev,
 229                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 230                 ctrl1, ctrl2, attached ? "attached" : "detached");
 231
 232         return 0;
 233 }
 234
 235 /*
 236  * max8997_muic_get_cable_type - Return cable type and check cable state
 237  * @info: the instance including private data of max8997 MUIC
 238  * @group: the path according to attached cable
 239  * @attached: store cable state and return
 240  *
 241  * This function check the cable state either attached or detached,
 242  * and then divide precise type of cable according to cable group.
 243  *      - MAX8997_CABLE_GROUP_ADC
 244  *      - MAX8997_CABLE_GROUP_CHG
 245  */
 246 static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
 247                 enum max8997_muic_cable_group group, bool *attached)
 248 {
 249         int cable_type = 0;
 250         int adc;
 251         int chg_type;
 252
 253         switch (group) {
 254         case MAX8997_CABLE_GROUP_ADC:
 255                 /*
 256                  * Read ADC value to check cable type and decide cable state
 257                  * according to cable type
 258                  */
 259                 adc = info->status[0] & STATUS1_ADC_MASK;
 260                 adc >>= STATUS1_ADC_SHIFT;
 261
 262                 /*
 263                  * Check current cable state/cable type and store cable type
 264                  * (info->prev_cable_type) for handling cable when cable is
 265                  * detached.
 266                  */
 267                 if (adc == MAX8997_MUIC_ADC_OPEN) {
 268                         *attached = false;
 269
 270                         cable_type = info->prev_cable_type;
 271                         info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
 272                 } else {
 273                         *attached = true;
 274
 275                         cable_type = info->prev_cable_type = adc;
 276                 }
 277                 break;
 278         case MAX8997_CABLE_GROUP_CHG:
 279                 /*
 280                  * Read charger type to check cable type and decide cable state
 281                  * according to type of charger cable.
 282                  */
 283                 chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
 284                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 285
 286                 if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
 287                         *attached = false;
 288
 289                         cable_type = info->prev_chg_type;
 290                         info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
 291                 } else {
 292                         *attached = true;
 293
 294                         /*
 295                          * Check current cable state/cable type and store cable
 296                          * type(info->prev_chg_type) for handling cable when
 297                          * charger cable is detached.
 298                          */
 299                         cable_type = info->prev_chg_type = chg_type;
 300                 }
 301
 302                 break;
 303         default:
 304                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 305                 cable_type = -EINVAL;
 306                 break;
 307         }
 308
 309         return cable_type;
 310 }
 311
 312 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 313                         enum max8997_muic_usb_type usb_type, bool attached)
 314 {
 315         int ret = 0;
 316
 317         ret = max8997_muic_set_path(info, info->path_usb, attached);
 318         if (ret < 0) {
 319                 dev_err(info->dev, "failed to update muic register\n");
 320                 return ret;
 321         }
 322
 323         switch (usb_type) {
 324         case MAX8997_USB_HOST:
 325                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
 326                 break;
 327         case MAX8997_USB_DEVICE:
 328                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
 329                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 330                                         attached);
 331                 break;
 332         default:
 333                 dev_err(info->dev, "failed to detect %s usb cable\n",
 334                         attached ? "attached" : "detached");
 335                 return -EINVAL;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 342                         int cable_type, bool attached)
 343 {
 344         int ret = 0;
 345
 346         ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 347         if (ret) {
 348                 dev_err(info->dev, "failed to update muic register\n");
 349                 return ret;
 350         }
 351
 352         switch (cable_type) {
 353         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 354         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 355                 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
 356                 break;
 357         default:
 358                 dev_err(info->dev, "failed to detect %s dock device\n",
 359                         attached ? "attached" : "detached");
 360                 return -EINVAL;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 367                         bool attached)
 368 {
 369         int ret = 0;
 370
 371         /* switch to UART */
 372         ret = max8997_muic_set_path(info, info->path_uart, attached);
 373         if (ret) {
 374                 dev_err(info->dev, "failed to update muic register\n");
 375                 return ret;
 376         }
 377
 378         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
 379
 380         return 0;
 381 }
 382
 383 static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 384 {
 385         int cable_type;
 386         bool attached;
 387         int ret = 0;
 388
 389         /* Check cable state which is either detached or attached */
 390         cable_type = max8997_muic_get_cable_type(info,
 391                                 MAX8997_CABLE_GROUP_ADC, &attached);
 392
 393         switch (cable_type) {
 394         case MAX8997_MUIC_ADC_GROUND:
 395                 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 396                 if (ret < 0)
 397                         return ret;
 398                 break;
 399         case MAX8997_MUIC_ADC_MHL:
 400                 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
 401                 break;
 402         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 403         case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 404                 ret = max8997_muic_handle_usb(info,
 405                                              MAX8997_USB_DEVICE, attached);
 406                 if (ret < 0)
 407                         return ret;
 408                 break;
 409         case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 410         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 411                 ret = max8997_muic_handle_dock(info, cable_type, attached);
 412                 if (ret < 0)
 413                         return ret;
 414                 break;
 415         case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 416                 ret = max8997_muic_handle_jig_uart(info, attached);
 417                 break;
 418         case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 419         case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 420         case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 421         case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 422         case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 423         case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 424         case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 425         case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 426         case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 427         case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 428         case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 429         case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 430         case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 431         case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 432         case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 433         case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 434         case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 435         case MAX8997_MUIC_ADC_CEA936_AUDIO:
 436         case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 437         case MAX8997_MUIC_ADC_TTY_CONVERTER:
 438         case MAX8997_MUIC_ADC_UART_CABLE:
 439         case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 440         case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 441         case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 442                 /*
 443                  * This cable isn't used in general case if it is specially
 444                  * needed to detect additional cable, should implement
 445                  * proper operation when this cable is attached/detached.
 446                  */
 447                 dev_info(info->dev,
 448                         "cable is %s but it isn't used (type:0x%x)\n",
 449                         attached ? "attached" : "detached", cable_type);
 450                 return -EAGAIN;
 451         default:
 452                 dev_err(info->dev,
 453                         "failed to detect %s unknown cable (type:0x%x)\n",
 454                         attached ? "attached" : "detached", cable_type);
 455                 return -EINVAL;
 456         }
 457
 458         return 0;
 459 }
 460
 461 static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 462 {
 463         int chg_type;
 464         bool attached;
 465         int adc;
 466
 467         chg_type = max8997_muic_get_cable_type(info,
 468                                 MAX8997_CABLE_GROUP_CHG, &attached);
 469
 470         switch (chg_type) {
 471         case MAX8997_CHARGER_TYPE_NONE:
 472                 break;
 473         case MAX8997_CHARGER_TYPE_USB:
 474                 adc = info->status[0] & STATUS1_ADC_MASK;
 475                 adc >>= STATUS1_ADC_SHIFT;
 476
 477                 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 478                         max8997_muic_handle_usb(info,
 479                                         MAX8997_USB_DEVICE, attached);
 480                 }
 481                 break;
 482         case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 483                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
 484                                         attached);
 485                 break;
 486         case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 487                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 488                                         attached);
 489                 break;
 490         case MAX8997_CHARGER_TYPE_500MA:
 491                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
 492                                         attached);
 493                 break;
 494         case MAX8997_CHARGER_TYPE_1A:
 495                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
 496                                         attached);
 497                 break;
 498         default:
 499                 dev_err(info->dev,
 500                         "failed to detect %s unknown chg cable (type:0x%x)\n",
 501                         attached ? "attached" : "detached", chg_type);
 502                 return -EINVAL;
 503         }
 504
 505         return 0;
 506 }
 507
 508 static void max8997_muic_irq_work(struct work_struct *work)
 509 {
 510         struct max8997_muic_info *info = container_of(work,
 511                         struct max8997_muic_info, irq_work);
 512         int irq_type = 0;
 513         int i, ret;
 514
 515         if (!info->edev)
 516                 return;
 517
 518         mutex_lock(&info->mutex);
 519
 520         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 521                 if (info->irq == muic_irqs[i].virq)
 522                         irq_type = muic_irqs[i].irq;
 523
 524         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 525                                 2, info->status);
 526         if (ret) {
 527                 dev_err(info->dev, "failed to read muic register\n");
 528                 mutex_unlock(&info->mutex);
 529                 return;
 530         }
 531
 532         switch (irq_type) {
 533         case MAX8997_MUICIRQ_ADCError:
 534         case MAX8997_MUICIRQ_ADCLow:
 535         case MAX8997_MUICIRQ_ADC:
 536                 /* Handle all of cable except for charger cable */
 537                 ret = max8997_muic_adc_handler(info);
 538                 break;
 539         case MAX8997_MUICIRQ_VBVolt:
 540         case MAX8997_MUICIRQ_DBChg:
 541         case MAX8997_MUICIRQ_DCDTmr:
 542         case MAX8997_MUICIRQ_ChgDetRun:
 543         case MAX8997_MUICIRQ_ChgTyp:
 544         case MAX8997_PMICIRQ_CHGINS:
 545         case MAX8997_PMICIRQ_CHGRM:
 546                 /* Handle charger cable */
 547                 ret = max8997_muic_chg_handler(info);
 548                 break;
 549         case MAX8997_MUICIRQ_OVP:
 550                 break;
 551         default:
 552                 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 553                                 irq_type);
 554                 mutex_unlock(&info->mutex);
 555                 return;
 556         }
 557
 558         if (ret < 0)
 559                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 560
 561         mutex_unlock(&info->mutex);
 562 }
 563
 564 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 565 {
 566         struct max8997_muic_info *info = data;
 567
 568         dev_dbg(info->dev, "irq:%d\n", irq);
 569         info->irq = irq;
 570
 571         schedule_work(&info->irq_work);
 572
 573         return IRQ_HANDLED;
 574 }
 575
 576 static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 577 {
 578         int ret = 0;
 579         int adc;
 580         int chg_type;
 581         bool attached;
 582
 583         mutex_lock(&info->mutex);
 584
 585         /* Read STATUSx register to detect accessory */
 586         ret = max8997_bulk_read(info->muic,
 587                         MAX8997_MUIC_REG_STATUS1, 2, info->status);
 588         if (ret) {
 589                 dev_err(info->dev, "failed to read MUIC register\n");
 590                 mutex_unlock(&info->mutex);
 591                 return ret;
 592         }
 593
 594         adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 595                                         &attached);
 596         if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 597                 ret = max8997_muic_adc_handler(info);
 598                 if (ret < 0) {
 599                         dev_err(info->dev, "Cannot detect ADC cable\n");
 600                         mutex_unlock(&info->mutex);
 601                         return ret;
 602                 }
 603         }
 604
 605         chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 606                                         &attached);
 607         if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 608                 ret = max8997_muic_chg_handler(info);
 609                 if (ret < 0) {
 610                         dev_err(info->dev, "Cannot detect charger cable\n");
 611                         mutex_unlock(&info->mutex);
 612                         return ret;
 613                 }
 614         }
 615
 616         mutex_unlock(&info->mutex);
 617
 618         return 0;
 619 }
 620
 621 static void max8997_muic_detect_cable_wq(struct work_struct *work)
 622 {
 623         struct max8997_muic_info *info = container_of(to_delayed_work(work),
 624                                 struct max8997_muic_info, wq_detcable);
 625         int ret;
 626
 627         ret = max8997_muic_detect_dev(info);
 628         if (ret < 0)
 629                 dev_err(info->dev, "failed to detect cable type\n");
 630 }
 631
 632 static int max8997_muic_probe(struct platform_device *pdev)
 633 {
 634         struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 635         struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 636         struct max8997_muic_info *info;
 637         int delay_jiffies;
 638         int cable_type;
 639         bool attached;
 640         int ret, i;
 641
 642         info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 643                             GFP_KERNEL);
 644         if (!info)
 645                 return -ENOMEM;
 646
 647         info->dev = &pdev->dev;
 648         info->muic = max8997->muic;
 649
 650         platform_set_drvdata(pdev, info);
 651         mutex_init(&info->mutex);
 652
 653         INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 654         ret = devm_work_autocancel(&pdev->dev, &info->irq_work,
 655                                    max8997_muic_irq_work);
 656         if (ret)
 657                 return ret;
 658
 659         for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 660                 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 661                 unsigned int virq = 0;
 662
 663                 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 664                 if (!virq)
 665                         return -EINVAL;
 666
 667                 muic_irq->virq = virq;
 668
 669                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 670                                                 max8997_muic_irq_handler,
 671                                                 IRQF_NO_SUSPEND,
 672                                                 muic_irq->name, info);
 673                 if (ret) {
 674                         dev_err(&pdev->dev,
 675                                 "failed: irq request (IRQ: %d, error :%d)\n",
 676                                 muic_irq->irq, ret);
 677                         return ret;
 678                 }
 679         }
 680
 681         /* External connector */
 682         info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
 683         if (IS_ERR(info->edev)) {
 684                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 685                 return PTR_ERR(info->edev);
 686         }
 687
 688         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 689         if (ret) {
 690                 dev_err(&pdev->dev, "failed to register extcon device\n");
 691                 return ret;
 692         }
 693
 694         if (pdata && pdata->muic_pdata) {
 695                 struct max8997_muic_platform_data *muic_pdata
 696                         = pdata->muic_pdata;
 697
 698                 /* Initialize registers according to platform data */
 699                 for (i = 0; i < muic_pdata->num_init_data; i++) {
 700                         max8997_write_reg(info->muic,
 701                                         muic_pdata->init_data[i].addr,
 702                                         muic_pdata->init_data[i].data);
 703                 }
 704
 705                 /*
 706                  * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 707                  * h/w path of COMP2/COMN1 on CONTROL1 register.
 708                  */
 709                 if (muic_pdata->path_uart)
 710                         info->path_uart = muic_pdata->path_uart;
 711                 else
 712                         info->path_uart = CONTROL1_SW_UART;
 713
 714                 if (muic_pdata->path_usb)
 715                         info->path_usb = muic_pdata->path_usb;
 716                 else
 717                         info->path_usb = CONTROL1_SW_USB;
 718
 719                 /*
 720                  * Default delay time for detecting cable state
 721                  * after certain time.
 722                  */
 723                 if (muic_pdata->detcable_delay_ms)
 724                         delay_jiffies =
 725                                 msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 726                 else
 727                         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 728         } else {
 729                 info->path_uart = CONTROL1_SW_UART;
 730                 info->path_usb = CONTROL1_SW_USB;
 731                 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 732         }
 733
 734         /* Set initial path for UART when JIG is connected to get serial logs */
 735         ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 736                                 2, info->status);
 737         if (ret) {
 738                 dev_err(info->dev, "failed to read MUIC register\n");
 739                 return ret;
 740         }
 741         cable_type = max8997_muic_get_cable_type(info,
 742                                            MAX8997_CABLE_GROUP_ADC, &attached);
 743         if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
 744                 max8997_muic_set_path(info, info->path_uart, true);
 745
 746         /* Set ADC debounce time */
 747         max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 748
 749         /*
 750          * Detect accessory after completing the initialization of platform
 751          *
 752          * - Use delayed workqueue to detect cable state and then
 753          * notify cable state to notifiee/platform through uevent.
 754          * After completing the booting of platform, the extcon provider
 755          * driver should notify cable state to upper layer.
 756          */
 757         INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 758         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 759                         delay_jiffies);
 760
 761         return 0;
 762 }
 763
 764 static struct platform_driver max8997_muic_driver = {
 765         .driver         = {
 766                 .name   = DEV_NAME,
 767         },
 768         .probe          = max8997_muic_probe,
 769 };
 770
 771 module_platform_driver(max8997_muic_driver);
 772
 773 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 774 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 775 MODULE_LICENSE("GPL");
 776 MODULE_ALIAS("platform:max8997-muic");