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