drivers/extcon/extcon-max14577.c

   1 /*
   2  * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
   3  *
   4  * Copyright (C) 2013,2014 Samsung Electronics
   5  * Chanwoo Choi <cw00.choi@samsung.com>
   6  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/i2c.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/mfd/max14577.h>
  25 #include <linux/mfd/max14577-private.h>
  26 #include <linux/extcon.h>
  27
  28 #define DELAY_MS_DEFAULT                17000           /* unit: millisecond */
  29
  30 enum max14577_muic_adc_debounce_time {
  31         ADC_DEBOUNCE_TIME_5MS = 0,
  32         ADC_DEBOUNCE_TIME_10MS,
  33         ADC_DEBOUNCE_TIME_25MS,
  34         ADC_DEBOUNCE_TIME_38_62MS,
  35 };
  36
  37 enum max14577_muic_status {
  38         MAX14577_MUIC_STATUS1 = 0,
  39         MAX14577_MUIC_STATUS2 = 1,
  40         MAX14577_MUIC_STATUS_END,
  41 };
  42
  43 /**
  44  * struct max14577_muic_irq
  45  * @irq: the index of irq list of MUIC device.
  46  * @name: the name of irq.
  47  * @virq: the virtual irq to use irq domain
  48  */
  49 struct max14577_muic_irq {
  50         unsigned int irq;
  51         const char *name;
  52         unsigned int virq;
  53 };
  54
  55 static struct max14577_muic_irq max14577_muic_irqs[] = {
  56         { MAX14577_IRQ_INT1_ADC,        "muic-ADC" },
  57         { MAX14577_IRQ_INT1_ADCLOW,     "muic-ADCLOW" },
  58         { MAX14577_IRQ_INT1_ADCERR,     "muic-ADCError" },
  59         { MAX14577_IRQ_INT2_CHGTYP,     "muic-CHGTYP" },
  60         { MAX14577_IRQ_INT2_CHGDETRUN,  "muic-CHGDETRUN" },
  61         { MAX14577_IRQ_INT2_DCDTMR,     "muic-DCDTMR" },
  62         { MAX14577_IRQ_INT2_DBCHG,      "muic-DBCHG" },
  63         { MAX14577_IRQ_INT2_VBVOLT,     "muic-VBVOLT" },
  64 };
  65
  66 static struct max14577_muic_irq max77836_muic_irqs[] = {
  67         { MAX14577_IRQ_INT1_ADC,        "muic-ADC" },
  68         { MAX14577_IRQ_INT1_ADCLOW,     "muic-ADCLOW" },
  69         { MAX14577_IRQ_INT1_ADCERR,     "muic-ADCError" },
  70         { MAX77836_IRQ_INT1_ADC1K,      "muic-ADC1K" },
  71         { MAX14577_IRQ_INT2_CHGTYP,     "muic-CHGTYP" },
  72         { MAX14577_IRQ_INT2_CHGDETRUN,  "muic-CHGDETRUN" },
  73         { MAX14577_IRQ_INT2_DCDTMR,     "muic-DCDTMR" },
  74         { MAX14577_IRQ_INT2_DBCHG,      "muic-DBCHG" },
  75         { MAX14577_IRQ_INT2_VBVOLT,     "muic-VBVOLT" },
  76         { MAX77836_IRQ_INT2_VIDRM,      "muic-VIDRM" },
  77 };
  78
  79 struct max14577_muic_info {
  80         struct device *dev;
  81         struct max14577 *max14577;
  82         struct extcon_dev *edev;
  83         int prev_cable_type;
  84         int prev_chg_type;
  85         u8 status[MAX14577_MUIC_STATUS_END];
  86
  87         struct max14577_muic_irq *muic_irqs;
  88         unsigned int muic_irqs_num;
  89         bool irq_adc;
  90         bool irq_chg;
  91         struct work_struct irq_work;
  92         struct mutex mutex;
  93
  94         /*
  95          * Use delayed workqueue to detect cable state and then
  96          * notify cable state to notifiee/platform through uevent.
  97          * After completing the booting of platform, the extcon provider
  98          * driver should notify cable state to upper layer.
  99          */
 100         struct delayed_work wq_detcable;
 101
 102         /*
 103          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 104          * h/w path of COMP2/COMN1 on CONTROL1 register.
 105          */
 106         int path_usb;
 107         int path_uart;
 108 };
 109
 110 enum max14577_muic_cable_group {
 111         MAX14577_CABLE_GROUP_ADC = 0,
 112         MAX14577_CABLE_GROUP_CHG,
 113 };
 114
 115 /* Define supported accessory type */
 116 enum max14577_muic_acc_type {
 117         MAX14577_MUIC_ADC_GROUND = 0x0,
 118         MAX14577_MUIC_ADC_SEND_END_BUTTON,
 119         MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
 120         MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
 121         MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
 122         MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
 123         MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
 124         MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
 125         MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
 126         MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
 127         MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
 128         MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
 129         MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
 130         MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
 131         MAX14577_MUIC_ADC_RESERVED_ACC_1,
 132         MAX14577_MUIC_ADC_RESERVED_ACC_2,
 133         MAX14577_MUIC_ADC_RESERVED_ACC_3,
 134         MAX14577_MUIC_ADC_RESERVED_ACC_4,
 135         MAX14577_MUIC_ADC_RESERVED_ACC_5,
 136         MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
 137         MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
 138         MAX14577_MUIC_ADC_TTY_CONVERTER,
 139         MAX14577_MUIC_ADC_UART_CABLE,
 140         MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
 141         MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
 142         MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
 143         MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
 144         MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
 145         MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
 146         MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
 147         MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
 148         MAX14577_MUIC_ADC_OPEN,
 149 };
 150
 151 static const unsigned int max14577_extcon_cable[] = {
 152         EXTCON_USB,
 153         EXTCON_CHG_USB_DCP,
 154         EXTCON_CHG_USB_FAST,
 155         EXTCON_CHG_USB_SLOW,
 156         EXTCON_CHG_USB_CDP,
 157         EXTCON_JIG,
 158         EXTCON_NONE,
 159 };
 160
 161 /*
 162  * max14577_muic_set_debounce_time - Set the debounce time of ADC
 163  * @info: the instance including private data of max14577 MUIC
 164  * @time: the debounce time of ADC
 165  */
 166 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
 167                 enum max14577_muic_adc_debounce_time time)
 168 {
 169         u8 ret;
 170
 171         switch (time) {
 172         case ADC_DEBOUNCE_TIME_5MS:
 173         case ADC_DEBOUNCE_TIME_10MS:
 174         case ADC_DEBOUNCE_TIME_25MS:
 175         case ADC_DEBOUNCE_TIME_38_62MS:
 176                 ret = max14577_update_reg(info->max14577->regmap,
 177                                           MAX14577_MUIC_REG_CONTROL3,
 178                                           CTRL3_ADCDBSET_MASK,
 179                                           time << CTRL3_ADCDBSET_SHIFT);
 180                 if (ret) {
 181                         dev_err(info->dev, "failed to set ADC debounce time\n");
 182                         return ret;
 183                 }
 184                 break;
 185         default:
 186                 dev_err(info->dev, "invalid ADC debounce time\n");
 187                 return -EINVAL;
 188         }
 189
 190         return 0;
 191 };
 192
 193 /*
 194  * max14577_muic_set_path - Set hardware line according to attached cable
 195  * @info: the instance including private data of max14577 MUIC
 196  * @value: the path according to attached cable
 197  * @attached: the state of cable (true:attached, false:detached)
 198  *
 199  * The max14577 MUIC device share outside H/W line among a varity of cables
 200  * so, this function set internal path of H/W line according to the type of
 201  * attached cable.
 202  */
 203 static int max14577_muic_set_path(struct max14577_muic_info *info,
 204                 u8 val, bool attached)
 205 {
 206         int ret = 0;
 207         u8 ctrl1, ctrl2 = 0;
 208
 209         /* Set open state to path before changing hw path */
 210         ret = max14577_update_reg(info->max14577->regmap,
 211                                 MAX14577_MUIC_REG_CONTROL1,
 212                                 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
 213         if (ret < 0) {
 214                 dev_err(info->dev, "failed to update MUIC register\n");
 215                 return ret;
 216         }
 217
 218         if (attached)
 219                 ctrl1 = val;
 220         else
 221                 ctrl1 = CTRL1_SW_OPEN;
 222
 223         ret = max14577_update_reg(info->max14577->regmap,
 224                                 MAX14577_MUIC_REG_CONTROL1,
 225                                 CLEAR_IDBEN_MICEN_MASK, ctrl1);
 226         if (ret < 0) {
 227                 dev_err(info->dev, "failed to update MUIC register\n");
 228                 return ret;
 229         }
 230
 231         if (attached)
 232                 ctrl2 |= CTRL2_CPEN_MASK;       /* LowPwr=0, CPEn=1 */
 233         else
 234                 ctrl2 |= CTRL2_LOWPWR_MASK;     /* LowPwr=1, CPEn=0 */
 235
 236         ret = max14577_update_reg(info->max14577->regmap,
 237                         MAX14577_REG_CONTROL2,
 238                         CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
 239         if (ret < 0) {
 240                 dev_err(info->dev, "failed to update MUIC register\n");
 241                 return ret;
 242         }
 243
 244         dev_dbg(info->dev,
 245                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 246                 ctrl1, ctrl2, attached ? "attached" : "detached");
 247
 248         return 0;
 249 }
 250
 251 /*
 252  * max14577_muic_get_cable_type - Return cable type and check cable state
 253  * @info: the instance including private data of max14577 MUIC
 254  * @group: the path according to attached cable
 255  * @attached: store cable state and return
 256  *
 257  * This function check the cable state either attached or detached,
 258  * and then divide precise type of cable according to cable group.
 259  *      - max14577_CABLE_GROUP_ADC
 260  *      - max14577_CABLE_GROUP_CHG
 261  */
 262 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
 263                 enum max14577_muic_cable_group group, bool *attached)
 264 {
 265         int cable_type = 0;
 266         int adc;
 267         int chg_type;
 268
 269         switch (group) {
 270         case MAX14577_CABLE_GROUP_ADC:
 271                 /*
 272                  * Read ADC value to check cable type and decide cable state
 273                  * according to cable type
 274                  */
 275                 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
 276                 adc >>= STATUS1_ADC_SHIFT;
 277
 278                 /*
 279                  * Check current cable state/cable type and store cable type
 280                  * (info->prev_cable_type) for handling cable when cable is
 281                  * detached.
 282                  */
 283                 if (adc == MAX14577_MUIC_ADC_OPEN) {
 284                         *attached = false;
 285
 286                         cable_type = info->prev_cable_type;
 287                         info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
 288                 } else {
 289                         *attached = true;
 290
 291                         cable_type = info->prev_cable_type = adc;
 292                 }
 293                 break;
 294         case MAX14577_CABLE_GROUP_CHG:
 295                 /*
 296                  * Read charger type to check cable type and decide cable state
 297                  * according to type of charger cable.
 298                  */
 299                 chg_type = info->status[MAX14577_MUIC_STATUS2] &
 300                         STATUS2_CHGTYP_MASK;
 301                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 302
 303                 if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
 304                         *attached = false;
 305
 306                         cable_type = info->prev_chg_type;
 307                         info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
 308                 } else {
 309                         *attached = true;
 310
 311                         /*
 312                          * Check current cable state/cable type and store cable
 313                          * type(info->prev_chg_type) for handling cable when
 314                          * charger cable is detached.
 315                          */
 316                         cable_type = info->prev_chg_type = chg_type;
 317                 }
 318
 319                 break;
 320         default:
 321                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 322                 cable_type = -EINVAL;
 323                 break;
 324         }
 325
 326         return cable_type;
 327 }
 328
 329 static int max14577_muic_jig_handler(struct max14577_muic_info *info,
 330                 int cable_type, bool attached)
 331 {
 332         int ret = 0;
 333         u8 path = CTRL1_SW_OPEN;
 334
 335         dev_dbg(info->dev,
 336                 "external connector is %s (adc:0x%02x)\n",
 337                 attached ? "attached" : "detached", cable_type);
 338
 339         switch (cable_type) {
 340         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:    /* ADC_JIG_USB_OFF */
 341         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:     /* ADC_JIG_USB_ON */
 342                 /* PATH:AP_USB */
 343                 path = CTRL1_SW_USB;
 344                 break;
 345         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:   /* ADC_JIG_UART_OFF */
 346                 /* PATH:AP_UART */
 347                 path = CTRL1_SW_UART;
 348                 break;
 349         default:
 350                 dev_err(info->dev, "failed to detect %s jig cable\n",
 351                         attached ? "attached" : "detached");
 352                 return -EINVAL;
 353         }
 354
 355         ret = max14577_muic_set_path(info, path, attached);
 356         if (ret < 0)
 357                 return ret;
 358
 359         extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
 360
 361         return 0;
 362 }
 363
 364 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
 365 {
 366         int cable_type;
 367         bool attached;
 368         int ret = 0;
 369
 370         /* Check accessory state which is either detached or attached */
 371         cable_type = max14577_muic_get_cable_type(info,
 372                                 MAX14577_CABLE_GROUP_ADC, &attached);
 373
 374         dev_dbg(info->dev,
 375                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 376                 attached ? "attached" : "detached", cable_type,
 377                 info->prev_cable_type);
 378
 379         switch (cable_type) {
 380         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
 381         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
 382         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
 383                 /* JIG */
 384                 ret = max14577_muic_jig_handler(info, cable_type, attached);
 385                 if (ret < 0)
 386                         return ret;
 387                 break;
 388         case MAX14577_MUIC_ADC_GROUND:
 389         case MAX14577_MUIC_ADC_SEND_END_BUTTON:
 390         case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
 391         case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
 392         case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
 393         case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
 394         case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
 395         case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
 396         case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
 397         case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
 398         case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
 399         case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
 400         case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
 401         case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
 402         case MAX14577_MUIC_ADC_RESERVED_ACC_1:
 403         case MAX14577_MUIC_ADC_RESERVED_ACC_2:
 404         case MAX14577_MUIC_ADC_RESERVED_ACC_3:
 405         case MAX14577_MUIC_ADC_RESERVED_ACC_4:
 406         case MAX14577_MUIC_ADC_RESERVED_ACC_5:
 407         case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 408         case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
 409         case MAX14577_MUIC_ADC_TTY_CONVERTER:
 410         case MAX14577_MUIC_ADC_UART_CABLE:
 411         case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
 412         case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
 413         case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
 414         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
 415         case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 416                 /*
 417                  * This accessory isn't used in general case if it is specially
 418                  * needed to detect additional accessory, should implement
 419                  * proper operation when this accessory is attached/detached.
 420                  */
 421                 dev_info(info->dev,
 422                         "accessory is %s but it isn't used (adc:0x%x)\n",
 423                         attached ? "attached" : "detached", cable_type);
 424                 return -EAGAIN;
 425         default:
 426                 dev_err(info->dev,
 427                         "failed to detect %s accessory (adc:0x%x)\n",
 428                         attached ? "attached" : "detached", cable_type);
 429                 return -EINVAL;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
 436 {
 437         int chg_type;
 438         bool attached;
 439         int ret = 0;
 440
 441         chg_type = max14577_muic_get_cable_type(info,
 442                                 MAX14577_CABLE_GROUP_CHG, &attached);
 443
 444         dev_dbg(info->dev,
 445                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 446                         attached ? "attached" : "detached",
 447                         chg_type, info->prev_chg_type);
 448
 449         switch (chg_type) {
 450         case MAX14577_CHARGER_TYPE_USB:
 451                 /* PATH:AP_USB */
 452                 ret = max14577_muic_set_path(info, info->path_usb, attached);
 453                 if (ret < 0)
 454                         return ret;
 455
 456                 extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
 457                 break;
 458         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 459                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP,
 460                                         attached);
 461                 break;
 462         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 463                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_CDP,
 464                                         attached);
 465                 break;
 466         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 467                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SLOW,
 468                                         attached);
 469                 break;
 470         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 471                 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_FAST,
 472                                         attached);
 473                 break;
 474         case MAX14577_CHARGER_TYPE_NONE:
 475         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 476                 break;
 477         default:
 478                 dev_err(info->dev,
 479                         "failed to detect %s accessory (chg_type:0x%x)\n",
 480                         attached ? "attached" : "detached", chg_type);
 481                 return -EINVAL;
 482         }
 483
 484         return 0;
 485 }
 486
 487 static void max14577_muic_irq_work(struct work_struct *work)
 488 {
 489         struct max14577_muic_info *info = container_of(work,
 490                         struct max14577_muic_info, irq_work);
 491         int ret = 0;
 492
 493         if (!info->edev)
 494                 return;
 495
 496         mutex_lock(&info->mutex);
 497
 498         ret = max14577_bulk_read(info->max14577->regmap,
 499                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 500         if (ret) {
 501                 dev_err(info->dev, "failed to read MUIC register\n");
 502                 mutex_unlock(&info->mutex);
 503                 return;
 504         }
 505
 506         if (info->irq_adc) {
 507                 ret = max14577_muic_adc_handler(info);
 508                 info->irq_adc = false;
 509         }
 510         if (info->irq_chg) {
 511                 ret = max14577_muic_chg_handler(info);
 512                 info->irq_chg = false;
 513         }
 514
 515         if (ret < 0)
 516                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 517
 518         mutex_unlock(&info->mutex);
 519 }
 520
 521 /*
 522  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
 523  * Returns 0 if irq_type does not match registered IRQ for this device type.
 524  */
 525 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
 526 {
 527         switch (irq_type) {
 528         case MAX14577_IRQ_INT1_ADC:
 529         case MAX14577_IRQ_INT1_ADCLOW:
 530         case MAX14577_IRQ_INT1_ADCERR:
 531                 /* Handle all of accessory except for
 532                    type of charger accessory */
 533                 info->irq_adc = true;
 534                 return 1;
 535         case MAX14577_IRQ_INT2_CHGTYP:
 536         case MAX14577_IRQ_INT2_CHGDETRUN:
 537         case MAX14577_IRQ_INT2_DCDTMR:
 538         case MAX14577_IRQ_INT2_DBCHG:
 539         case MAX14577_IRQ_INT2_VBVOLT:
 540                 /* Handle charger accessory */
 541                 info->irq_chg = true;
 542                 return 1;
 543         default:
 544                 return 0;
 545         }
 546 }
 547
 548 /*
 549  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
 550  * Returns 0 if irq_type does not match registered IRQ for this device type.
 551  */
 552 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
 553 {
 554         /* First check common max14577 interrupts */
 555         if (max14577_parse_irq(info, irq_type))
 556                 return 1;
 557
 558         switch (irq_type) {
 559         case MAX77836_IRQ_INT1_ADC1K:
 560                 info->irq_adc = true;
 561                 return 1;
 562         case MAX77836_IRQ_INT2_VIDRM:
 563                 /* Handle charger accessory */
 564                 info->irq_chg = true;
 565                 return 1;
 566         default:
 567                 return 0;
 568         }
 569 }
 570
 571 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
 572 {
 573         struct max14577_muic_info *info = data;
 574         int i, irq_type = -1;
 575         bool irq_parsed;
 576
 577         /*
 578          * We may be called multiple times for different nested IRQ-s.
 579          * Including changes in INT1_ADC and INT2_CGHTYP at once.
 580          * However we only need to know whether it was ADC, charger
 581          * or both interrupts so decode IRQ and turn on proper flags.
 582          */
 583         for (i = 0; i < info->muic_irqs_num; i++)
 584                 if (irq == info->muic_irqs[i].virq)
 585                         irq_type = info->muic_irqs[i].irq;
 586
 587         switch (info->max14577->dev_type) {
 588         case MAXIM_DEVICE_TYPE_MAX77836:
 589                 irq_parsed = max77836_parse_irq(info, irq_type);
 590                 break;
 591         case MAXIM_DEVICE_TYPE_MAX14577:
 592         default:
 593                 irq_parsed = max14577_parse_irq(info, irq_type);
 594                 break;
 595         }
 596
 597         if (!irq_parsed) {
 598                 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
 599                                 irq_type);
 600                 return IRQ_HANDLED;
 601         }
 602         schedule_work(&info->irq_work);
 603
 604         return IRQ_HANDLED;
 605 }
 606
 607 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
 608 {
 609         int ret = 0;
 610         int adc;
 611         int chg_type;
 612         bool attached;
 613
 614         mutex_lock(&info->mutex);
 615
 616         /* Read STATUSx register to detect accessory */
 617         ret = max14577_bulk_read(info->max14577->regmap,
 618                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 619         if (ret) {
 620                 dev_err(info->dev, "failed to read MUIC register\n");
 621                 mutex_unlock(&info->mutex);
 622                 return ret;
 623         }
 624
 625         adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
 626                                         &attached);
 627         if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
 628                 ret = max14577_muic_adc_handler(info);
 629                 if (ret < 0) {
 630                         dev_err(info->dev, "Cannot detect accessory\n");
 631                         mutex_unlock(&info->mutex);
 632                         return ret;
 633                 }
 634         }
 635
 636         chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
 637                                         &attached);
 638         if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
 639                 ret = max14577_muic_chg_handler(info);
 640                 if (ret < 0) {
 641                         dev_err(info->dev, "Cannot detect charger accessory\n");
 642                         mutex_unlock(&info->mutex);
 643                         return ret;
 644                 }
 645         }
 646
 647         mutex_unlock(&info->mutex);
 648
 649         return 0;
 650 }
 651
 652 static void max14577_muic_detect_cable_wq(struct work_struct *work)
 653 {
 654         struct max14577_muic_info *info = container_of(to_delayed_work(work),
 655                                 struct max14577_muic_info, wq_detcable);
 656
 657         max14577_muic_detect_accessory(info);
 658 }
 659
 660 static int max14577_muic_probe(struct platform_device *pdev)
 661 {
 662         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 663         struct max14577_muic_info *info;
 664         int delay_jiffies;
 665         int ret;
 666         int i;
 667         u8 id;
 668
 669         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 670         if (!info)
 671                 return -ENOMEM;
 672
 673         info->dev = &pdev->dev;
 674         info->max14577 = max14577;
 675
 676         platform_set_drvdata(pdev, info);
 677         mutex_init(&info->mutex);
 678
 679         INIT_WORK(&info->irq_work, max14577_muic_irq_work);
 680
 681         switch (max14577->dev_type) {
 682         case MAXIM_DEVICE_TYPE_MAX77836:
 683                 info->muic_irqs = max77836_muic_irqs;
 684                 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
 685                 break;
 686         case MAXIM_DEVICE_TYPE_MAX14577:
 687         default:
 688                 info->muic_irqs = max14577_muic_irqs;
 689                 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
 690         }
 691
 692         /* Support irq domain for max14577 MUIC device */
 693         for (i = 0; i < info->muic_irqs_num; i++) {
 694                 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
 695                 unsigned int virq = 0;
 696
 697                 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
 698                 if (virq <= 0)
 699                         return -EINVAL;
 700                 muic_irq->virq = virq;
 701
 702                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 703                                 max14577_muic_irq_handler,
 704                                 IRQF_NO_SUSPEND,
 705                                 muic_irq->name, info);
 706                 if (ret) {
 707                         dev_err(&pdev->dev,
 708                                 "failed: irq request (IRQ: %d, error :%d)\n",
 709                                 muic_irq->irq, ret);
 710                         return ret;
 711                 }
 712         }
 713
 714         /* Initialize extcon device */
 715         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 716                                               max14577_extcon_cable);
 717         if (IS_ERR(info->edev)) {
 718                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 719                 return -ENOMEM;
 720         }
 721
 722         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 723         if (ret) {
 724                 dev_err(&pdev->dev, "failed to register extcon device\n");
 725                 return ret;
 726         }
 727
 728         /* Default h/w line path */
 729         info->path_usb = CTRL1_SW_USB;
 730         info->path_uart = CTRL1_SW_UART;
 731         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 732
 733         /* Set initial path for UART */
 734         max14577_muic_set_path(info, info->path_uart, true);
 735
 736         /* Check revision number of MUIC device*/
 737         ret = max14577_read_reg(info->max14577->regmap,
 738                         MAX14577_REG_DEVICEID, &id);
 739         if (ret < 0) {
 740                 dev_err(&pdev->dev, "failed to read revision number\n");
 741                 return ret;
 742         }
 743         dev_info(info->dev, "device ID : 0x%x\n", id);
 744
 745         /* Set ADC debounce time */
 746         max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 747
 748         /*
 749          * Detect accessory after completing the initialization of platform
 750          *
 751          * - Use delayed workqueue to detect cable state and then
 752          * notify cable state to notifiee/platform through uevent.
 753          * After completing the booting of platform, the extcon provider
 754          * driver should notify cable state to upper layer.
 755          */
 756         INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
 757         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 758                         delay_jiffies);
 759
 760         return ret;
 761 }
 762
 763 static int max14577_muic_remove(struct platform_device *pdev)
 764 {
 765         struct max14577_muic_info *info = platform_get_drvdata(pdev);
 766
 767         cancel_work_sync(&info->irq_work);
 768
 769         return 0;
 770 }
 771
 772 static const struct platform_device_id max14577_muic_id[] = {
 773         { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
 774         { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
 775         { }
 776 };
 777 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
 778
 779 static struct platform_driver max14577_muic_driver = {
 780         .driver         = {
 781                 .name   = "max14577-muic",
 782         },
 783         .probe          = max14577_muic_probe,
 784         .remove         = max14577_muic_remove,
 785         .id_table       = max14577_muic_id,
 786 };
 787
 788 module_platform_driver(max14577_muic_driver);
 789
 790 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
 791 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 792 MODULE_LICENSE("GPL");
 793 MODULE_ALIAS("platform:extcon-max14577");