drivers/extcon/extcon-max14577.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
   4 //
   5 // Copyright (C) 2013,2014 Samsung Electronics
   6 // Chanwoo Choi <cw00.choi@samsung.com>
   7 // Krzysztof Kozlowski <krzk@kernel.org>
   8
   9 #include <linux/devm-helpers.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/i2c.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/mfd/max14577.h>
  16 #include <linux/mfd/max14577-private.h>
  17 #include <linux/extcon-provider.h>
  18
  19 #define DELAY_MS_DEFAULT                17000           /* unit: millisecond */
  20
  21 enum max14577_muic_adc_debounce_time {
  22         ADC_DEBOUNCE_TIME_5MS = 0,
  23         ADC_DEBOUNCE_TIME_10MS,
  24         ADC_DEBOUNCE_TIME_25MS,
  25         ADC_DEBOUNCE_TIME_38_62MS,
  26 };
  27
  28 enum max14577_muic_status {
  29         MAX14577_MUIC_STATUS1 = 0,
  30         MAX14577_MUIC_STATUS2 = 1,
  31         MAX14577_MUIC_STATUS_END,
  32 };
  33
  34 /**
  35  * struct max14577_muic_irq
  36  * @irq: the index of irq list of MUIC device.
  37  * @name: the name of irq.
  38  * @virq: the virtual irq to use irq domain
  39  */
  40 struct max14577_muic_irq {
  41         unsigned int irq;
  42         const char *name;
  43         unsigned int virq;
  44 };
  45
  46 static struct max14577_muic_irq max14577_muic_irqs[] = {
  47         { MAX14577_IRQ_INT1_ADC,        "muic-ADC" },
  48         { MAX14577_IRQ_INT1_ADCLOW,     "muic-ADCLOW" },
  49         { MAX14577_IRQ_INT1_ADCERR,     "muic-ADCError" },
  50         { MAX14577_IRQ_INT2_CHGTYP,     "muic-CHGTYP" },
  51         { MAX14577_IRQ_INT2_CHGDETRUN,  "muic-CHGDETRUN" },
  52         { MAX14577_IRQ_INT2_DCDTMR,     "muic-DCDTMR" },
  53         { MAX14577_IRQ_INT2_DBCHG,      "muic-DBCHG" },
  54         { MAX14577_IRQ_INT2_VBVOLT,     "muic-VBVOLT" },
  55 };
  56
  57 static struct max14577_muic_irq max77836_muic_irqs[] = {
  58         { MAX14577_IRQ_INT1_ADC,        "muic-ADC" },
  59         { MAX14577_IRQ_INT1_ADCLOW,     "muic-ADCLOW" },
  60         { MAX14577_IRQ_INT1_ADCERR,     "muic-ADCError" },
  61         { MAX77836_IRQ_INT1_ADC1K,      "muic-ADC1K" },
  62         { MAX14577_IRQ_INT2_CHGTYP,     "muic-CHGTYP" },
  63         { MAX14577_IRQ_INT2_CHGDETRUN,  "muic-CHGDETRUN" },
  64         { MAX14577_IRQ_INT2_DCDTMR,     "muic-DCDTMR" },
  65         { MAX14577_IRQ_INT2_DBCHG,      "muic-DBCHG" },
  66         { MAX14577_IRQ_INT2_VBVOLT,     "muic-VBVOLT" },
  67         { MAX77836_IRQ_INT2_VIDRM,      "muic-VIDRM" },
  68 };
  69
  70 struct max14577_muic_info {
  71         struct device *dev;
  72         struct max14577 *max14577;
  73         struct extcon_dev *edev;
  74         int prev_cable_type;
  75         int prev_chg_type;
  76         u8 status[MAX14577_MUIC_STATUS_END];
  77
  78         struct max14577_muic_irq *muic_irqs;
  79         unsigned int muic_irqs_num;
  80         bool irq_adc;
  81         bool irq_chg;
  82         struct work_struct irq_work;
  83         struct mutex mutex;
  84
  85         /*
  86          * Use delayed workqueue to detect cable state and then
  87          * notify cable state to notifiee/platform through uevent.
  88          * After completing the booting of platform, the extcon provider
  89          * driver should notify cable state to upper layer.
  90          */
  91         struct delayed_work wq_detcable;
  92
  93         /*
  94          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
  95          * h/w path of COMP2/COMN1 on CONTROL1 register.
  96          */
  97         int path_usb;
  98         int path_uart;
  99 };
 100
 101 enum max14577_muic_cable_group {
 102         MAX14577_CABLE_GROUP_ADC = 0,
 103         MAX14577_CABLE_GROUP_CHG,
 104 };
 105
 106 /* Define supported accessory type */
 107 enum max14577_muic_acc_type {
 108         MAX14577_MUIC_ADC_GROUND = 0x0,
 109         MAX14577_MUIC_ADC_SEND_END_BUTTON,
 110         MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
 111         MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
 112         MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
 113         MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
 114         MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
 115         MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
 116         MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
 117         MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
 118         MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
 119         MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
 120         MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
 121         MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
 122         MAX14577_MUIC_ADC_RESERVED_ACC_1,
 123         MAX14577_MUIC_ADC_RESERVED_ACC_2,
 124         MAX14577_MUIC_ADC_RESERVED_ACC_3,
 125         MAX14577_MUIC_ADC_RESERVED_ACC_4,
 126         MAX14577_MUIC_ADC_RESERVED_ACC_5,
 127         MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
 128         MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
 129         MAX14577_MUIC_ADC_TTY_CONVERTER,
 130         MAX14577_MUIC_ADC_UART_CABLE,
 131         MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
 132         MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
 133         MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
 134         MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
 135         MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
 136         MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
 137         MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
 138         MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
 139         MAX14577_MUIC_ADC_OPEN,
 140 };
 141
 142 static const unsigned int max14577_extcon_cable[] = {
 143         EXTCON_USB,
 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_JIG,
 150         EXTCON_NONE,
 151 };
 152
 153 /*
 154  * max14577_muic_set_debounce_time - Set the debounce time of ADC
 155  * @info: the instance including private data of max14577 MUIC
 156  * @time: the debounce time of ADC
 157  */
 158 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
 159                 enum max14577_muic_adc_debounce_time time)
 160 {
 161         u8 ret;
 162
 163         switch (time) {
 164         case ADC_DEBOUNCE_TIME_5MS:
 165         case ADC_DEBOUNCE_TIME_10MS:
 166         case ADC_DEBOUNCE_TIME_25MS:
 167         case ADC_DEBOUNCE_TIME_38_62MS:
 168                 ret = max14577_update_reg(info->max14577->regmap,
 169                                           MAX14577_MUIC_REG_CONTROL3,
 170                                           CTRL3_ADCDBSET_MASK,
 171                                           time << CTRL3_ADCDBSET_SHIFT);
 172                 if (ret) {
 173                         dev_err(info->dev, "failed to set ADC debounce time\n");
 174                         return ret;
 175                 }
 176                 break;
 177         default:
 178                 dev_err(info->dev, "invalid ADC debounce time\n");
 179                 return -EINVAL;
 180         }
 181
 182         return 0;
 183 };
 184
 185 /*
 186  * max14577_muic_set_path - Set hardware line according to attached cable
 187  * @info: the instance including private data of max14577 MUIC
 188  * @value: the path according to attached cable
 189  * @attached: the state of cable (true:attached, false:detached)
 190  *
 191  * The max14577 MUIC device share outside H/W line among a varity of cables
 192  * so, this function set internal path of H/W line according to the type of
 193  * attached cable.
 194  */
 195 static int max14577_muic_set_path(struct max14577_muic_info *info,
 196                 u8 val, bool attached)
 197 {
 198         u8 ctrl1, ctrl2 = 0;
 199         int ret;
 200
 201         /* Set open state to path before changing hw path */
 202         ret = max14577_update_reg(info->max14577->regmap,
 203                                 MAX14577_MUIC_REG_CONTROL1,
 204                                 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
 205         if (ret < 0) {
 206                 dev_err(info->dev, "failed to update MUIC register\n");
 207                 return ret;
 208         }
 209
 210         if (attached)
 211                 ctrl1 = val;
 212         else
 213                 ctrl1 = CTRL1_SW_OPEN;
 214
 215         ret = max14577_update_reg(info->max14577->regmap,
 216                                 MAX14577_MUIC_REG_CONTROL1,
 217                                 CLEAR_IDBEN_MICEN_MASK, ctrl1);
 218         if (ret < 0) {
 219                 dev_err(info->dev, "failed to update MUIC register\n");
 220                 return ret;
 221         }
 222
 223         if (attached)
 224                 ctrl2 |= CTRL2_CPEN_MASK;       /* LowPwr=0, CPEn=1 */
 225         else
 226                 ctrl2 |= CTRL2_LOWPWR_MASK;     /* LowPwr=1, CPEn=0 */
 227
 228         ret = max14577_update_reg(info->max14577->regmap,
 229                         MAX14577_REG_CONTROL2,
 230                         CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
 231         if (ret < 0) {
 232                 dev_err(info->dev, "failed to update MUIC register\n");
 233                 return ret;
 234         }
 235
 236         dev_dbg(info->dev,
 237                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 238                 ctrl1, ctrl2, attached ? "attached" : "detached");
 239
 240         return 0;
 241 }
 242
 243 /*
 244  * max14577_muic_get_cable_type - Return cable type and check cable state
 245  * @info: the instance including private data of max14577 MUIC
 246  * @group: the path according to attached cable
 247  * @attached: store cable state and return
 248  *
 249  * This function check the cable state either attached or detached,
 250  * and then divide precise type of cable according to cable group.
 251  *      - max14577_CABLE_GROUP_ADC
 252  *      - max14577_CABLE_GROUP_CHG
 253  */
 254 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
 255                 enum max14577_muic_cable_group group, bool *attached)
 256 {
 257         int cable_type = 0;
 258         int adc;
 259         int chg_type;
 260
 261         switch (group) {
 262         case MAX14577_CABLE_GROUP_ADC:
 263                 /*
 264                  * Read ADC value to check cable type and decide cable state
 265                  * according to cable type
 266                  */
 267                 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
 268                 adc >>= STATUS1_ADC_SHIFT;
 269
 270                 /*
 271                  * Check current cable state/cable type and store cable type
 272                  * (info->prev_cable_type) for handling cable when cable is
 273                  * detached.
 274                  */
 275                 if (adc == MAX14577_MUIC_ADC_OPEN) {
 276                         *attached = false;
 277
 278                         cable_type = info->prev_cable_type;
 279                         info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
 280                 } else {
 281                         *attached = true;
 282
 283                         cable_type = info->prev_cable_type = adc;
 284                 }
 285                 break;
 286         case MAX14577_CABLE_GROUP_CHG:
 287                 /*
 288                  * Read charger type to check cable type and decide cable state
 289                  * according to type of charger cable.
 290                  */
 291                 chg_type = info->status[MAX14577_MUIC_STATUS2] &
 292                         STATUS2_CHGTYP_MASK;
 293                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 294
 295                 if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
 296                         *attached = false;
 297
 298                         cable_type = info->prev_chg_type;
 299                         info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
 300                 } else {
 301                         *attached = true;
 302
 303                         /*
 304                          * Check current cable state/cable type and store cable
 305                          * type(info->prev_chg_type) for handling cable when
 306                          * charger cable is detached.
 307                          */
 308                         cable_type = info->prev_chg_type = chg_type;
 309                 }
 310
 311                 break;
 312         default:
 313                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 314                 cable_type = -EINVAL;
 315                 break;
 316         }
 317
 318         return cable_type;
 319 }
 320
 321 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
 322                 int cable_type, bool attached)
 323 {
 324         int ret = 0;
 325         u8 path = CTRL1_SW_OPEN;
 326
 327         dev_dbg(info->dev,
 328                 "external connector is %s (adc:0x%02x)\n",
 329                 attached ? "attached" : "detached", cable_type);
 330
 331         switch (cable_type) {
 332         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:    /* ADC_JIG_USB_OFF */
 333         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:     /* ADC_JIG_USB_ON */
 334                 /* PATH:AP_USB */
 335                 path = CTRL1_SW_USB;
 336                 break;
 337         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:   /* ADC_JIG_UART_OFF */
 338                 /* PATH:AP_UART */
 339                 path = CTRL1_SW_UART;
 340                 break;
 341         default:
 342                 dev_err(info->dev, "failed to detect %s jig cable\n",
 343                         attached ? "attached" : "detached");
 344                 return -EINVAL;
 345         }
 346
 347         ret = max14577_muic_set_path(info, path, attached);
 348         if (ret < 0)
 349                 return ret;
 350
 351         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
 352
 353         return 0;
 354 }
 355
 356 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
 357 {
 358         int cable_type;
 359         bool attached;
 360         int ret = 0;
 361
 362         /* Check accessory state which is either detached or attached */
 363         cable_type = max14577_muic_get_cable_type(info,
 364                                 MAX14577_CABLE_GROUP_ADC, &attached);
 365
 366         dev_dbg(info->dev,
 367                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 368                 attached ? "attached" : "detached", cable_type,
 369                 info->prev_cable_type);
 370
 371         switch (cable_type) {
 372         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
 373         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
 374         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
 375                 /* JIG */
 376                 ret = max14577_muic_jig_handler(info, cable_type, attached);
 377                 if (ret < 0)
 378                         return ret;
 379                 break;
 380         case MAX14577_MUIC_ADC_GROUND:
 381         case MAX14577_MUIC_ADC_SEND_END_BUTTON:
 382         case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
 383         case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
 384         case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
 385         case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
 386         case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
 387         case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
 388         case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
 389         case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
 390         case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
 391         case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
 392         case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
 393         case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
 394         case MAX14577_MUIC_ADC_RESERVED_ACC_1:
 395         case MAX14577_MUIC_ADC_RESERVED_ACC_2:
 396         case MAX14577_MUIC_ADC_RESERVED_ACC_3:
 397         case MAX14577_MUIC_ADC_RESERVED_ACC_4:
 398         case MAX14577_MUIC_ADC_RESERVED_ACC_5:
 399         case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 400         case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
 401         case MAX14577_MUIC_ADC_TTY_CONVERTER:
 402         case MAX14577_MUIC_ADC_UART_CABLE:
 403         case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
 404         case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
 405         case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
 406         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
 407         case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 408                 /*
 409                  * This accessory isn't used in general case if it is specially
 410                  * needed to detect additional accessory, should implement
 411                  * proper operation when this accessory is attached/detached.
 412                  */
 413                 dev_info(info->dev,
 414                         "accessory is %s but it isn't used (adc:0x%x)\n",
 415                         attached ? "attached" : "detached", cable_type);
 416                 return -EAGAIN;
 417         default:
 418                 dev_err(info->dev,
 419                         "failed to detect %s accessory (adc:0x%x)\n",
 420                         attached ? "attached" : "detached", cable_type);
 421                 return -EINVAL;
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
 428 {
 429         int chg_type;
 430         bool attached;
 431         int ret = 0;
 432
 433         chg_type = max14577_muic_get_cable_type(info,
 434                                 MAX14577_CABLE_GROUP_CHG, &attached);
 435
 436         dev_dbg(info->dev,
 437                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 438                         attached ? "attached" : "detached",
 439                         chg_type, info->prev_chg_type);
 440
 441         switch (chg_type) {
 442         case MAX14577_CHARGER_TYPE_USB:
 443                 /* PATH:AP_USB */
 444                 ret = max14577_muic_set_path(info, info->path_usb, attached);
 445                 if (ret < 0)
 446                         return ret;
 447
 448                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
 449                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 450                                         attached);
 451                 break;
 452         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 453                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 454                                         attached);
 455                 break;
 456         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 457                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
 458                                         attached);
 459                 break;
 460         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 461                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
 462                                         attached);
 463                 break;
 464         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 465                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
 466                                         attached);
 467                 break;
 468         case MAX14577_CHARGER_TYPE_NONE:
 469         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 470                 break;
 471         default:
 472                 dev_err(info->dev,
 473                         "failed to detect %s accessory (chg_type:0x%x)\n",
 474                         attached ? "attached" : "detached", chg_type);
 475                 return -EINVAL;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static void max14577_muic_irq_work(struct work_struct *work)
 482 {
 483         struct max14577_muic_info *info = container_of(work,
 484                         struct max14577_muic_info, irq_work);
 485         int ret = 0;
 486
 487         if (!info->edev)
 488                 return;
 489
 490         mutex_lock(&info->mutex);
 491
 492         ret = max14577_bulk_read(info->max14577->regmap,
 493                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 494         if (ret) {
 495                 dev_err(info->dev, "failed to read MUIC register\n");
 496                 mutex_unlock(&info->mutex);
 497                 return;
 498         }
 499
 500         if (info->irq_adc) {
 501                 ret = max14577_muic_adc_handler(info);
 502                 info->irq_adc = false;
 503         }
 504         if (info->irq_chg) {
 505                 ret = max14577_muic_chg_handler(info);
 506                 info->irq_chg = false;
 507         }
 508
 509         if (ret < 0)
 510                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 511
 512         mutex_unlock(&info->mutex);
 513 }
 514
 515 /*
 516  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
 517  * Returns 0 if irq_type does not match registered IRQ for this device type.
 518  */
 519 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
 520 {
 521         switch (irq_type) {
 522         case MAX14577_IRQ_INT1_ADC:
 523         case MAX14577_IRQ_INT1_ADCLOW:
 524         case MAX14577_IRQ_INT1_ADCERR:
 525                 /*
 526                  * Handle all of accessory except for
 527                  * type of charger accessory.
 528                  */
 529                 info->irq_adc = true;
 530                 return 1;
 531         case MAX14577_IRQ_INT2_CHGTYP:
 532         case MAX14577_IRQ_INT2_CHGDETRUN:
 533         case MAX14577_IRQ_INT2_DCDTMR:
 534         case MAX14577_IRQ_INT2_DBCHG:
 535         case MAX14577_IRQ_INT2_VBVOLT:
 536                 /* Handle charger accessory */
 537                 info->irq_chg = true;
 538                 return 1;
 539         default:
 540                 return 0;
 541         }
 542 }
 543
 544 /*
 545  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
 546  * Returns 0 if irq_type does not match registered IRQ for this device type.
 547  */
 548 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
 549 {
 550         /* First check common max14577 interrupts */
 551         if (max14577_parse_irq(info, irq_type))
 552                 return 1;
 553
 554         switch (irq_type) {
 555         case MAX77836_IRQ_INT1_ADC1K:
 556                 info->irq_adc = true;
 557                 return 1;
 558         case MAX77836_IRQ_INT2_VIDRM:
 559                 /* Handle charger accessory */
 560                 info->irq_chg = true;
 561                 return 1;
 562         default:
 563                 return 0;
 564         }
 565 }
 566
 567 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
 568 {
 569         struct max14577_muic_info *info = data;
 570         int i, irq_type = -1;
 571         bool irq_parsed;
 572
 573         /*
 574          * We may be called multiple times for different nested IRQ-s.
 575          * Including changes in INT1_ADC and INT2_CGHTYP at once.
 576          * However we only need to know whether it was ADC, charger
 577          * or both interrupts so decode IRQ and turn on proper flags.
 578          */
 579         for (i = 0; i < info->muic_irqs_num; i++)
 580                 if (irq == info->muic_irqs[i].virq)
 581                         irq_type = info->muic_irqs[i].irq;
 582
 583         switch (info->max14577->dev_type) {
 584         case MAXIM_DEVICE_TYPE_MAX77836:
 585                 irq_parsed = max77836_parse_irq(info, irq_type);
 586                 break;
 587         case MAXIM_DEVICE_TYPE_MAX14577:
 588         default:
 589                 irq_parsed = max14577_parse_irq(info, irq_type);
 590                 break;
 591         }
 592
 593         if (!irq_parsed) {
 594                 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
 595                                 irq_type);
 596                 return IRQ_HANDLED;
 597         }
 598         schedule_work(&info->irq_work);
 599
 600         return IRQ_HANDLED;
 601 }
 602
 603 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
 604 {
 605         int ret = 0;
 606         int adc;
 607         int chg_type;
 608         bool attached;
 609
 610         mutex_lock(&info->mutex);
 611
 612         /* Read STATUSx register to detect accessory */
 613         ret = max14577_bulk_read(info->max14577->regmap,
 614                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 615         if (ret) {
 616                 dev_err(info->dev, "failed to read MUIC register\n");
 617                 mutex_unlock(&info->mutex);
 618                 return ret;
 619         }
 620
 621         adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
 622                                         &attached);
 623         if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
 624                 ret = max14577_muic_adc_handler(info);
 625                 if (ret < 0) {
 626                         dev_err(info->dev, "Cannot detect accessory\n");
 627                         mutex_unlock(&info->mutex);
 628                         return ret;
 629                 }
 630         }
 631
 632         chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
 633                                         &attached);
 634         if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
 635                 ret = max14577_muic_chg_handler(info);
 636                 if (ret < 0) {
 637                         dev_err(info->dev, "Cannot detect charger accessory\n");
 638                         mutex_unlock(&info->mutex);
 639                         return ret;
 640                 }
 641         }
 642
 643         mutex_unlock(&info->mutex);
 644
 645         return 0;
 646 }
 647
 648 static void max14577_muic_detect_cable_wq(struct work_struct *work)
 649 {
 650         struct max14577_muic_info *info = container_of(to_delayed_work(work),
 651                                 struct max14577_muic_info, wq_detcable);
 652
 653         max14577_muic_detect_accessory(info);
 654 }
 655
 656 static int max14577_muic_probe(struct platform_device *pdev)
 657 {
 658         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 659         struct max14577_muic_info *info;
 660         int delay_jiffies;
 661         int cable_type;
 662         bool attached;
 663         int ret;
 664         int i;
 665         u8 id;
 666
 667         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 668         if (!info)
 669                 return -ENOMEM;
 670
 671         info->dev = &pdev->dev;
 672         info->max14577 = max14577;
 673
 674         platform_set_drvdata(pdev, info);
 675         mutex_init(&info->mutex);
 676
 677         ret = devm_work_autocancel(&pdev->dev, &info->irq_work,
 678                                    max14577_muic_irq_work);
 679         if (ret)
 680                 return ret;
 681
 682         switch (max14577->dev_type) {
 683         case MAXIM_DEVICE_TYPE_MAX77836:
 684                 info->muic_irqs = max77836_muic_irqs;
 685                 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
 686                 break;
 687         case MAXIM_DEVICE_TYPE_MAX14577:
 688         default:
 689                 info->muic_irqs = max14577_muic_irqs;
 690                 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
 691         }
 692
 693         /* Support irq domain for max14577 MUIC device */
 694         for (i = 0; i < info->muic_irqs_num; i++) {
 695                 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
 696                 int virq = 0;
 697
 698                 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
 699                 if (virq <= 0)
 700                         return -EINVAL;
 701                 muic_irq->virq = virq;
 702
 703                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 704                                 max14577_muic_irq_handler,
 705                                 IRQF_NO_SUSPEND,
 706                                 muic_irq->name, info);
 707                 if (ret) {
 708                         dev_err(&pdev->dev,
 709                                 "failed: irq request (IRQ: %d, error :%d)\n",
 710                                 muic_irq->irq, ret);
 711                         return ret;
 712                 }
 713         }
 714
 715         /* Initialize extcon device */
 716         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 717                                               max14577_extcon_cable);
 718         if (IS_ERR(info->edev)) {
 719                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 720                 return PTR_ERR(info->edev);
 721         }
 722
 723         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 724         if (ret) {
 725                 dev_err(&pdev->dev, "failed to register extcon device\n");
 726                 return ret;
 727         }
 728
 729         /* Default h/w line path */
 730         info->path_usb = CTRL1_SW_USB;
 731         info->path_uart = CTRL1_SW_UART;
 732         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 733
 734         /* Set initial path for UART when JIG is connected to get serial logs */
 735         ret = max14577_bulk_read(info->max14577->regmap,
 736                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 737         if (ret) {
 738                 dev_err(info->dev, "Cannot read STATUS registers\n");
 739                 return ret;
 740         }
 741         cable_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
 742                                          &attached);
 743         if (attached && cable_type == MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF)
 744                 max14577_muic_set_path(info, info->path_uart, true);
 745
 746         /* Check revision number of MUIC device*/
 747         ret = max14577_read_reg(info->max14577->regmap,
 748                         MAX14577_REG_DEVICEID, &id);
 749         if (ret < 0) {
 750                 dev_err(&pdev->dev, "failed to read revision number\n");
 751                 return ret;
 752         }
 753         dev_info(info->dev, "device ID : 0x%x\n", id);
 754
 755         /* Set ADC debounce time */
 756         max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 757
 758         /*
 759          * Detect accessory after completing the initialization of platform
 760          *
 761          * - Use delayed workqueue to detect cable state and then
 762          * notify cable state to notifiee/platform through uevent.
 763          * After completing the booting of platform, the extcon provider
 764          * driver should notify cable state to upper layer.
 765          */
 766         INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
 767         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 768                         delay_jiffies);
 769
 770         return ret;
 771 }
 772
 773 static const struct platform_device_id max14577_muic_id[] = {
 774         { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
 775         { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
 776         { }
 777 };
 778 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
 779
 780 static const struct of_device_id of_max14577_muic_dt_match[] = {
 781         { .compatible = "maxim,max14577-muic",
 782           .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, },
 783         { .compatible = "maxim,max77836-muic",
 784           .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, },
 785         { },
 786 };
 787 MODULE_DEVICE_TABLE(of, of_max14577_muic_dt_match);
 788
 789 static struct platform_driver max14577_muic_driver = {
 790         .driver         = {
 791                 .name   = "max14577-muic",
 792                 .of_match_table = of_max14577_muic_dt_match,
 793         },
 794         .probe          = max14577_muic_probe,
 795         .id_table       = max14577_muic_id,
 796 };
 797
 798 module_platform_driver(max14577_muic_driver);
 799
 800 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
 801 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
 802 MODULE_LICENSE("GPL");
 803 MODULE_ALIAS("platform:extcon-max14577");