drivers/extcon/extcon-max8997.c

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