drivers/extcon/extcon-max77843.c

   1 /*
   2  * extcon-max77843.c - Maxim MAX77843 extcon driver to support
   3  *                      MUIC(Micro USB Interface Controller)
   4  *
   5  * Copyright (C) 2015 Samsung Electronics
   6  * Author: Jaewon Kim <jaewon02.kim@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
  14 #include <linux/extcon.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mfd/max77843-private.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/workqueue.h>
  22
  23 #define DELAY_MS_DEFAULT                15000   /* unit: millisecond */
  24
  25 enum max77843_muic_status {
  26         MAX77843_MUIC_STATUS1 = 0,
  27         MAX77843_MUIC_STATUS2,
  28         MAX77843_MUIC_STATUS3,
  29
  30         MAX77843_MUIC_STATUS_NUM,
  31 };
  32
  33 struct max77843_muic_info {
  34         struct device *dev;
  35         struct max77843 *max77843;
  36         struct extcon_dev *edev;
  37
  38         struct mutex mutex;
  39         struct work_struct irq_work;
  40         struct delayed_work wq_detcable;
  41
  42         u8 status[MAX77843_MUIC_STATUS_NUM];
  43         int prev_cable_type;
  44         int prev_chg_type;
  45         int prev_gnd_type;
  46
  47         bool irq_adc;
  48         bool irq_chg;
  49 };
  50
  51 enum max77843_muic_cable_group {
  52         MAX77843_CABLE_GROUP_ADC = 0,
  53         MAX77843_CABLE_GROUP_ADC_GND,
  54         MAX77843_CABLE_GROUP_CHG,
  55 };
  56
  57 enum max77843_muic_adc_debounce_time {
  58         MAX77843_DEBOUNCE_TIME_5MS = 0,
  59         MAX77843_DEBOUNCE_TIME_10MS,
  60         MAX77843_DEBOUNCE_TIME_25MS,
  61         MAX77843_DEBOUNCE_TIME_38_62MS,
  62 };
  63
  64 /* Define accessory cable type */
  65 enum max77843_muic_accessory_type {
  66         MAX77843_MUIC_ADC_GROUND = 0,
  67         MAX77843_MUIC_ADC_SEND_END_BUTTON,
  68         MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
  69         MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
  70         MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
  71         MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
  72         MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
  73         MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
  74         MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
  75         MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
  76         MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
  77         MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
  78         MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
  79         MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
  80         MAX77843_MUIC_ADC_RESERVED_ACC_1,
  81         MAX77843_MUIC_ADC_RESERVED_ACC_2,
  82         MAX77843_MUIC_ADC_RESERVED_ACC_3,
  83         MAX77843_MUIC_ADC_RESERVED_ACC_4,
  84         MAX77843_MUIC_ADC_RESERVED_ACC_5,
  85         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
  86         MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
  87         MAX77843_MUIC_ADC_TTY_CONVERTER,
  88         MAX77843_MUIC_ADC_UART_CABLE,
  89         MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
  90         MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
  91         MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
  92         MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
  93         MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
  94         MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
  95         MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
  96         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
  97         MAX77843_MUIC_ADC_OPEN,
  98
  99         /* The blow accessories should check
 100            not only ADC value but also ADC1K and VBVolt value. */
 101                                                 /* Offset|ADC1K|VBVolt| */
 102         MAX77843_MUIC_GND_USB_HOST = 0x100,     /*    0x1|    0|     0| */
 103         MAX77843_MUIC_GND_USB_HOST_VB = 0x101,  /*    0x1|    0|     1| */
 104         MAX77843_MUIC_GND_MHL = 0x102,          /*    0x1|    1|     0| */
 105         MAX77843_MUIC_GND_MHL_VB = 0x103,       /*    0x1|    1|     1| */
 106 };
 107
 108 /* Define charger cable type */
 109 enum max77843_muic_charger_type {
 110         MAX77843_MUIC_CHG_NONE = 0,
 111         MAX77843_MUIC_CHG_USB,
 112         MAX77843_MUIC_CHG_DOWNSTREAM,
 113         MAX77843_MUIC_CHG_DEDICATED,
 114         MAX77843_MUIC_CHG_SPECIAL_500MA,
 115         MAX77843_MUIC_CHG_SPECIAL_1A,
 116         MAX77843_MUIC_CHG_SPECIAL_BIAS,
 117         MAX77843_MUIC_CHG_RESERVED,
 118         MAX77843_MUIC_CHG_GND,
 119 };
 120
 121 enum {
 122         MAX77843_CABLE_USB = 0,
 123         MAX77843_CABLE_USB_HOST,
 124         MAX77843_CABLE_TA,
 125         MAX77843_CABLE_CHARGE_DOWNSTREAM,
 126         MAX77843_CABLE_FAST_CHARGER,
 127         MAX77843_CABLE_SLOW_CHARGER,
 128         MAX77843_CABLE_MHL,
 129         MAX77843_CABLE_MHL_TA,
 130         MAX77843_CABLE_JIG,
 131
 132         MAX77843_CABLE_NUM,
 133 };
 134
 135 static const char *max77843_extcon_cable[] = {
 136         [MAX77843_CABLE_USB]                    = "USB",
 137         [MAX77843_CABLE_USB_HOST]               = "USB-HOST",
 138         [MAX77843_CABLE_TA]                     = "TA",
 139         [MAX77843_CABLE_CHARGE_DOWNSTREAM]      = "CHARGER-DOWNSTREAM",
 140         [MAX77843_CABLE_FAST_CHARGER]           = "FAST-CHARGER",
 141         [MAX77843_CABLE_SLOW_CHARGER]           = "SLOW-CHARGER",
 142         [MAX77843_CABLE_MHL]                    = "MHL",
 143         [MAX77843_CABLE_MHL_TA]                 = "MHL-TA",
 144         [MAX77843_CABLE_JIG]                    = "JIG",
 145 };
 146
 147 struct max77843_muic_irq {
 148         unsigned int irq;
 149         const char *name;
 150         unsigned int virq;
 151 };
 152
 153 static struct max77843_muic_irq max77843_muic_irqs[] = {
 154         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 155         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 156         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 157         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 158         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 159         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 160         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 161         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 162         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 163         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 164         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 165         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 166         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 167         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 168         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 169         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 170 };
 171
 172 static const struct regmap_config max77843_muic_regmap_config = {
 173         .reg_bits       = 8,
 174         .val_bits       = 8,
 175         .max_register   = MAX77843_MUIC_REG_END,
 176 };
 177
 178 static const struct regmap_irq max77843_muic_irq[] = {
 179         /* INT1 interrupt */
 180         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 181         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 182         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 183
 184         /* INT2 interrupt */
 185         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 186         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 187         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 188         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 189         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 190
 191         /* INT3 interrupt */
 192         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 193         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 194         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 195         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 196         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 197         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 198         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 199         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 200 };
 201
 202 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 203         .name           = "max77843-muic",
 204         .status_base    = MAX77843_MUIC_REG_INT1,
 205         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 206         .mask_invert    = true,
 207         .num_regs       = 3,
 208         .irqs           = max77843_muic_irq,
 209         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 210 };
 211
 212 static int max77843_muic_set_path(struct max77843_muic_info *info,
 213                 u8 val, bool attached)
 214 {
 215         struct max77843 *max77843 = info->max77843;
 216         int ret = 0;
 217         unsigned int ctrl1, ctrl2;
 218
 219         if (attached)
 220                 ctrl1 = val;
 221         else
 222                 ctrl1 = CONTROL1_SW_OPEN;
 223
 224         ret = regmap_update_bits(max77843->regmap_muic,
 225                         MAX77843_MUIC_REG_CONTROL1,
 226                         CONTROL1_COM_SW, ctrl1);
 227         if (ret < 0) {
 228                 dev_err(info->dev, "Cannot switch MUIC port\n");
 229                 return ret;
 230         }
 231
 232         if (attached)
 233                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 234         else
 235                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 236
 237         ret = regmap_update_bits(max77843->regmap_muic,
 238                         MAX77843_MUIC_REG_CONTROL2,
 239                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 240                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 241         if (ret < 0) {
 242                 dev_err(info->dev, "Cannot update lowpower mode\n");
 243                 return ret;
 244         }
 245
 246         dev_dbg(info->dev,
 247                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 248                 ctrl1, ctrl2, attached ? "attached" : "detached");
 249
 250         return 0;
 251 }
 252
 253 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 254                 enum max77843_muic_cable_group group, bool *attached)
 255 {
 256         int adc, chg_type, cable_type, gnd_type;
 257
 258         adc = info->status[MAX77843_MUIC_STATUS1] &
 259                         MAX77843_MUIC_STATUS1_ADC_MASK;
 260         adc >>= STATUS1_ADC_SHIFT;
 261
 262         switch (group) {
 263         case MAX77843_CABLE_GROUP_ADC:
 264                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 265                         *attached = false;
 266                         cable_type = info->prev_cable_type;
 267                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 268                 } else {
 269                         *attached = true;
 270                         cable_type = info->prev_cable_type = adc;
 271                 }
 272                 break;
 273         case MAX77843_CABLE_GROUP_CHG:
 274                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 275                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 276
 277                 /* Check GROUND accessory with charger cable */
 278                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 279                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 280                                 /* The following state when charger cable is
 281                                  * disconnected but the GROUND accessory still
 282                                  * connected */
 283                                 *attached = false;
 284                                 cable_type = info->prev_chg_type;
 285                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 286                         } else {
 287
 288                                 /* The following state when charger cable is
 289                                  * connected on the GROUND accessory */
 290                                 *attached = true;
 291                                 cable_type = MAX77843_MUIC_CHG_GND;
 292                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 293                         }
 294                         break;
 295                 }
 296
 297                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 298                         *attached = false;
 299                         cable_type = info->prev_chg_type;
 300                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 301                 } else {
 302                         *attached = true;
 303                         cable_type = info->prev_chg_type = chg_type;
 304                 }
 305                 break;
 306         case MAX77843_CABLE_GROUP_ADC_GND:
 307                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 308                         *attached = false;
 309                         cable_type = info->prev_gnd_type;
 310                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 311                 } else {
 312                         *attached = true;
 313
 314                         /* Offset|ADC1K|VBVolt|
 315                          *    0x1|    0|     0| USB-HOST
 316                          *    0x1|    0|     1| USB-HOST with VB
 317                          *    0x1|    1|     0| MHL
 318                          *    0x1|    1|     1| MHL with VB */
 319                         /* Get ADC1K register bit */
 320                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 321                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 322
 323                         /* Get VBVolt register bit */
 324                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 325                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 326                         gnd_type >>= STATUS2_VBVOLT_SHIFT;
 327
 328                         /* Offset of GND cable */
 329                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 330                         cable_type = info->prev_gnd_type = gnd_type;
 331                 }
 332                 break;
 333         default:
 334                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 335                 cable_type = -EINVAL;
 336                 break;
 337         }
 338
 339         return cable_type;
 340 }
 341
 342 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 343 {
 344         int ret, gnd_cable_type;
 345         bool attached;
 346
 347         gnd_cable_type = max77843_muic_get_cable_type(info,
 348                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 349         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 350                         attached ? "attached" : "detached", gnd_cable_type);
 351
 352         switch (gnd_cable_type) {
 353         case MAX77843_MUIC_GND_USB_HOST:
 354         case MAX77843_MUIC_GND_USB_HOST_VB:
 355                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 356                 if (ret < 0)
 357                         return ret;
 358
 359                 extcon_set_cable_state(info->edev, "USB-HOST", attached);
 360                 break;
 361         case MAX77843_MUIC_GND_MHL_VB:
 362         case MAX77843_MUIC_GND_MHL:
 363                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 364                 if (ret < 0)
 365                         return ret;
 366
 367                 extcon_set_cable_state(info->edev, "MHL", attached);
 368                 break;
 369         default:
 370                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 371                         attached ? "attached" : "detached", gnd_cable_type);
 372                 return -EINVAL;
 373         }
 374
 375         return 0;
 376 }
 377
 378 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 379                 int cable_type, bool attached)
 380 {
 381         int ret;
 382         u8 path = CONTROL1_SW_OPEN;
 383
 384         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 385                         attached ? "attached" : "detached", cable_type);
 386
 387         switch (cable_type) {
 388         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 389         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 390                 path = CONTROL1_SW_USB;
 391                 break;
 392         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 393                 path = CONTROL1_SW_UART;
 394                 break;
 395         default:
 396                 return -EINVAL;
 397         }
 398
 399         ret = max77843_muic_set_path(info, path, attached);
 400         if (ret < 0)
 401                 return ret;
 402
 403         extcon_set_cable_state(info->edev, "JIG", attached);
 404
 405         return 0;
 406 }
 407
 408 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 409 {
 410         int ret, cable_type;
 411         bool attached;
 412
 413         cable_type = max77843_muic_get_cable_type(info,
 414                         MAX77843_CABLE_GROUP_ADC, &attached);
 415
 416         dev_dbg(info->dev,
 417                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 418                 attached ? "attached" : "detached", cable_type,
 419                 info->prev_cable_type);
 420
 421         switch (cable_type) {
 422         case MAX77843_MUIC_ADC_GROUND:
 423                 ret = max77843_muic_adc_gnd_handler(info);
 424                 if (ret < 0)
 425                         return ret;
 426                 break;
 427         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 428         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 429         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 430                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 431                 if (ret < 0)
 432                         return ret;
 433                 break;
 434         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 435         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 436         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 437         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 438         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 439         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 440         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 441         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 442         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 443         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 444         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 445         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 446         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 447         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 448         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 449         case MAX77843_MUIC_ADC_RESERVED_ACC_3:
 450         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 451         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 452         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 453         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 454         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 455         case MAX77843_MUIC_ADC_UART_CABLE:
 456         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 457         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 458         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 459         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 460         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 461         case MAX77843_MUIC_ADC_OPEN:
 462                 dev_err(info->dev,
 463                         "accessory is %s but it isn't used (adc:0x%x)\n",
 464                         attached ? "attached" : "detached", cable_type);
 465                 return -EAGAIN;
 466         default:
 467                 dev_err(info->dev,
 468                         "failed to detect %s accessory (adc:0x%x)\n",
 469                         attached ? "attached" : "detached", cable_type);
 470                 return -EINVAL;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 477 {
 478         int ret, chg_type, gnd_type;
 479         bool attached;
 480
 481         chg_type = max77843_muic_get_cable_type(info,
 482                         MAX77843_CABLE_GROUP_CHG, &attached);
 483
 484         dev_dbg(info->dev,
 485                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 486                 attached ? "attached" : "detached",
 487                 chg_type, info->prev_chg_type);
 488
 489         switch (chg_type) {
 490         case MAX77843_MUIC_CHG_USB:
 491                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 492                 if (ret < 0)
 493                         return ret;
 494
 495                 extcon_set_cable_state(info->edev, "USB", attached);
 496                 break;
 497         case MAX77843_MUIC_CHG_DOWNSTREAM:
 498                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 499                 if (ret < 0)
 500                         return ret;
 501
 502                 extcon_set_cable_state(info->edev,
 503                                 "CHARGER-DOWNSTREAM", attached);
 504                 break;
 505         case MAX77843_MUIC_CHG_DEDICATED:
 506                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 507                 if (ret < 0)
 508                         return ret;
 509
 510                 extcon_set_cable_state(info->edev, "TA", attached);
 511                 break;
 512         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 513                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 514                 if (ret < 0)
 515                         return ret;
 516
 517                 extcon_set_cable_state(info->edev, "SLOW-CHAREGER", attached);
 518                 break;
 519         case MAX77843_MUIC_CHG_SPECIAL_1A:
 520                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 521                 if (ret < 0)
 522                         return ret;
 523
 524                 extcon_set_cable_state(info->edev, "FAST-CHARGER", attached);
 525                 break;
 526         case MAX77843_MUIC_CHG_GND:
 527                 gnd_type = max77843_muic_get_cable_type(info,
 528                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 529
 530                 /* Charger cable on MHL accessory is attach or detach */
 531                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 532                         extcon_set_cable_state(info->edev, "MHL-TA", true);
 533                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 534                         extcon_set_cable_state(info->edev, "MHL-TA", false);
 535                 break;
 536         case MAX77843_MUIC_CHG_NONE:
 537                 break;
 538         default:
 539                 dev_err(info->dev,
 540                         "failed to detect %s accessory (chg_type:0x%x)\n",
 541                         attached ? "attached" : "detached", chg_type);
 542
 543                 max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 544                 return -EINVAL;
 545         }
 546
 547         return 0;
 548 }
 549
 550 static void max77843_muic_irq_work(struct work_struct *work)
 551 {
 552         struct max77843_muic_info *info = container_of(work,
 553                         struct max77843_muic_info, irq_work);
 554         struct max77843 *max77843 = info->max77843;
 555         int ret = 0;
 556
 557         mutex_lock(&info->mutex);
 558
 559         ret = regmap_bulk_read(max77843->regmap_muic,
 560                         MAX77843_MUIC_REG_STATUS1, info->status,
 561                         MAX77843_MUIC_STATUS_NUM);
 562         if (ret) {
 563                 dev_err(info->dev, "Cannot read STATUS registers\n");
 564                 mutex_unlock(&info->mutex);
 565                 return;
 566         }
 567
 568         if (info->irq_adc) {
 569                 ret = max77843_muic_adc_handler(info);
 570                 if (ret)
 571                         dev_err(info->dev, "Unknown cable type\n");
 572                 info->irq_adc = false;
 573         }
 574
 575         if (info->irq_chg) {
 576                 ret = max77843_muic_chg_handler(info);
 577                 if (ret)
 578                         dev_err(info->dev, "Unknown charger type\n");
 579                 info->irq_chg = false;
 580         }
 581
 582         mutex_unlock(&info->mutex);
 583 }
 584
 585 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 586 {
 587         struct max77843_muic_info *info = data;
 588         int i, irq_type = -1;
 589
 590         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 591                 if (irq == max77843_muic_irqs[i].virq)
 592                         irq_type = max77843_muic_irqs[i].irq;
 593
 594         switch (irq_type) {
 595         case MAX77843_MUIC_IRQ_INT1_ADC:
 596         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 597         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 598                 info->irq_adc = true;
 599                 break;
 600         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 601         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 602         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 603         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 604         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 605                 info->irq_chg = true;
 606                 break;
 607         case MAX77843_MUIC_IRQ_INT3_VBADC:
 608         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 609         case MAX77843_MUIC_IRQ_INT3_DNRES:
 610         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 611         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 612         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 613         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 614         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 615                 break;
 616         default:
 617                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 618                 break;
 619         }
 620
 621         schedule_work(&info->irq_work);
 622
 623         return IRQ_HANDLED;
 624 }
 625
 626 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 627 {
 628         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 629                         struct max77843_muic_info, wq_detcable);
 630         struct max77843 *max77843 = info->max77843;
 631         int chg_type, adc, ret;
 632         bool attached;
 633
 634         mutex_lock(&info->mutex);
 635
 636         ret = regmap_bulk_read(max77843->regmap_muic,
 637                         MAX77843_MUIC_REG_STATUS1, info->status,
 638                         MAX77843_MUIC_STATUS_NUM);
 639         if (ret) {
 640                 dev_err(info->dev, "Cannot read STATUS registers\n");
 641                 goto err_cable_wq;
 642         }
 643
 644         adc = max77843_muic_get_cable_type(info,
 645                         MAX77843_CABLE_GROUP_ADC, &attached);
 646         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 647                 ret = max77843_muic_adc_handler(info);
 648                 if (ret < 0) {
 649                         dev_err(info->dev, "Cannot detect accessory\n");
 650                         goto err_cable_wq;
 651                 }
 652         }
 653
 654         chg_type = max77843_muic_get_cable_type(info,
 655                         MAX77843_CABLE_GROUP_CHG, &attached);
 656         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 657                 ret = max77843_muic_chg_handler(info);
 658                 if (ret < 0) {
 659                         dev_err(info->dev, "Cannot detect charger accessory\n");
 660                         goto err_cable_wq;
 661                 }
 662         }
 663
 664 err_cable_wq:
 665         mutex_unlock(&info->mutex);
 666 }
 667
 668 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 669                 enum max77843_muic_adc_debounce_time time)
 670 {
 671         struct max77843 *max77843 = info->max77843;
 672         int ret;
 673
 674         switch (time) {
 675         case MAX77843_DEBOUNCE_TIME_5MS:
 676         case MAX77843_DEBOUNCE_TIME_10MS:
 677         case MAX77843_DEBOUNCE_TIME_25MS:
 678         case MAX77843_DEBOUNCE_TIME_38_62MS:
 679                 ret = regmap_update_bits(max77843->regmap_muic,
 680                                 MAX77843_MUIC_REG_CONTROL4,
 681                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 682                                 time << CONTROL4_ADCDBSET_SHIFT);
 683                 if (ret < 0) {
 684                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 685                         return ret;
 686                 }
 687                 break;
 688         default:
 689                 dev_err(info->dev, "Invalid ADC debounce time\n");
 690                 return -EINVAL;
 691         }
 692
 693         return 0;
 694 }
 695
 696 static int max77843_init_muic_regmap(struct max77843 *max77843)
 697 {
 698         int ret;
 699
 700         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 701                         I2C_ADDR_MUIC);
 702         if (!max77843->i2c_muic) {
 703                 dev_err(&max77843->i2c->dev,
 704                                 "Cannot allocate I2C device for MUIC\n");
 705                 return -ENOMEM;
 706         }
 707
 708         i2c_set_clientdata(max77843->i2c_muic, max77843);
 709
 710         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 711                         &max77843_muic_regmap_config);
 712         if (IS_ERR(max77843->regmap_muic)) {
 713                 ret = PTR_ERR(max77843->regmap_muic);
 714                 goto err_muic_i2c;
 715         }
 716
 717         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 718                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 719                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 720         if (ret < 0) {
 721                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 722                 goto err_muic_i2c;
 723         }
 724
 725         return 0;
 726
 727 err_muic_i2c:
 728         i2c_unregister_device(max77843->i2c_muic);
 729
 730         return ret;
 731 }
 732
 733 static int max77843_muic_probe(struct platform_device *pdev)
 734 {
 735         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 736         struct max77843_muic_info *info;
 737         unsigned int id;
 738         int i, ret;
 739
 740         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 741         if (!info)
 742                 return -ENOMEM;
 743
 744         info->dev = &pdev->dev;
 745         info->max77843 = max77843;
 746
 747         platform_set_drvdata(pdev, info);
 748         mutex_init(&info->mutex);
 749
 750         /* Initialize i2c and regmap */
 751         ret = max77843_init_muic_regmap(max77843);
 752         if (ret) {
 753                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 754                 return ret;
 755         }
 756
 757         /* Turn off auto detection configuration */
 758         ret = regmap_update_bits(max77843->regmap_muic,
 759                         MAX77843_MUIC_REG_CONTROL4,
 760                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 761                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 762                         CONTROL4_AUTO_DISABLE);
 763
 764         /* Initialize extcon device */
 765         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 766                         max77843_extcon_cable);
 767         if (IS_ERR(info->edev)) {
 768                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 769                 ret = -ENODEV;
 770                 goto err_muic_irq;
 771         }
 772
 773         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 774         if (ret) {
 775                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 776                 goto err_muic_irq;
 777         }
 778
 779         /* Set ADC debounce time */
 780         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 781
 782         /* Set initial path for UART */
 783         max77843_muic_set_path(info, CONTROL1_SW_UART, true);
 784
 785         /* Check revision number of MUIC device */
 786         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 787         if (ret < 0) {
 788                 dev_err(&pdev->dev, "Failed to read revision number\n");
 789                 goto err_muic_irq;
 790         }
 791         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 792
 793         /* Support virtual irq domain for max77843 MUIC device */
 794         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 795
 796         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 797                 struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
 798                 unsigned int virq = 0;
 799
 800                 virq = regmap_irq_get_virq(max77843->irq_data_muic,
 801                                 muic_irq->irq);
 802                 if (virq <= 0) {
 803                         ret = -EINVAL;
 804                         goto err_muic_irq;
 805                 }
 806                 muic_irq->virq = virq;
 807
 808                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 809                                 max77843_muic_irq_handler, IRQF_NO_SUSPEND,
 810                                 muic_irq->name, info);
 811                 if (ret) {
 812                         dev_err(&pdev->dev,
 813                                 "Failed to request irq (IRQ: %d, error: %d)\n",
 814                                 muic_irq->irq, ret);
 815                         goto err_muic_irq;
 816                 }
 817         }
 818
 819         /* Detect accessory after completing the initialization of platform */
 820         INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
 821         queue_delayed_work(system_power_efficient_wq,
 822                         &info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
 823
 824         return 0;
 825
 826 err_muic_irq:
 827         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 828         i2c_unregister_device(max77843->i2c_muic);
 829
 830         return ret;
 831 }
 832
 833 static int max77843_muic_remove(struct platform_device *pdev)
 834 {
 835         struct max77843_muic_info *info = platform_get_drvdata(pdev);
 836         struct max77843 *max77843 = info->max77843;
 837
 838         cancel_work_sync(&info->irq_work);
 839         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 840         i2c_unregister_device(max77843->i2c_muic);
 841
 842         return 0;
 843 }
 844
 845 static const struct platform_device_id max77843_muic_id[] = {
 846         { "max77843-muic", },
 847         { /* sentinel */ },
 848 };
 849 MODULE_DEVICE_TABLE(platform, max77843_muic_id);
 850
 851 static struct platform_driver max77843_muic_driver = {
 852         .driver         = {
 853                 .name           = "max77843-muic",
 854         },
 855         .probe          = max77843_muic_probe,
 856         .remove         = max77843_muic_remove,
 857         .id_table       = max77843_muic_id,
 858 };
 859
 860 static int __init max77843_muic_init(void)
 861 {
 862         return platform_driver_register(&max77843_muic_driver);
 863 }
 864 subsys_initcall(max77843_muic_init);
 865
 866 MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
 867 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 868 MODULE_LICENSE("GPL");