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 #define MAX77843_MUIC_IRQ_NUM           3
  25
  26 enum max77843_muic_status {
  27         MAX77843_MUIC_STATUS1 = 0,
  28         MAX77843_MUIC_STATUS2,
  29         MAX77843_MUIC_STATUS3,
  30
  31         MAX77843_MUIC_STATUS_NUM,
  32 };
  33
  34 struct max77843_muic_info {
  35         struct device *dev;
  36         struct max77843 *max77843;
  37         struct extcon_dev *edev;
  38
  39         struct mutex mutex;
  40         struct work_struct irq_work;
  41         struct delayed_work wq_detcable;
  42
  43         u8 status[MAX77843_MUIC_STATUS_NUM];
  44         int prev_cable_type;
  45         int prev_chg_type;
  46         int prev_gnd_type;
  47
  48         bool irq_adc;
  49         bool irq_chg;
  50 };
  51
  52 enum max77843_muic_cable_group {
  53         MAX77843_CABLE_GROUP_ADC = 0,
  54         MAX77843_CABLE_GROUP_ADC_GND,
  55         MAX77843_CABLE_GROUP_CHG,
  56 };
  57
  58 enum max77843_muic_adc_debounce_time {
  59         MAX77843_DEBOUNCE_TIME_5MS = 0,
  60         MAX77843_DEBOUNCE_TIME_10MS,
  61         MAX77843_DEBOUNCE_TIME_25MS,
  62         MAX77843_DEBOUNCE_TIME_38_62MS,
  63 };
  64
  65 /* Define accessory cable type */
  66 enum max77843_muic_accessory_type {
  67         MAX77843_MUIC_ADC_GROUND = 0,
  68         MAX77843_MUIC_ADC_SEND_END_BUTTON,
  69         MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
  70         MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
  71         MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
  72         MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
  73         MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
  74         MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
  75         MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
  76         MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
  77         MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
  78         MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
  79         MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
  80         MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
  81         MAX77843_MUIC_ADC_RESERVED_ACC_1,
  82         MAX77843_MUIC_ADC_RESERVED_ACC_2,
  83         MAX77843_MUIC_ADC_RESERVED_ACC_3, /* SmartDock */
  84         MAX77843_MUIC_ADC_RESERVED_ACC_4,
  85         MAX77843_MUIC_ADC_RESERVED_ACC_5,
  86         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
  87         MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
  88         MAX77843_MUIC_ADC_TTY_CONVERTER,
  89         MAX77843_MUIC_ADC_UART_CABLE,
  90         MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
  91         MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
  92         MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
  93         MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
  94         MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
  95         MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
  96         MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
  97         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
  98         MAX77843_MUIC_ADC_OPEN,
  99
 100         /* The blow accessories should check
 101            not only ADC value but also ADC1K and VBVolt value. */
 102                                                 /* Offset|ADC1K|VBVolt| */
 103         MAX77843_MUIC_GND_USB_HOST = 0x100,     /*    0x1|    0|     0| */
 104         MAX77843_MUIC_GND_USB_HOST_VB = 0x101,  /*    0x1|    0|     1| */
 105         MAX77843_MUIC_GND_MHL = 0x102,          /*    0x1|    1|     0| */
 106         MAX77843_MUIC_GND_MHL_VB = 0x103,       /*    0x1|    1|     1| */
 107 };
 108
 109 /* Define charger cable type */
 110 enum max77843_muic_charger_type {
 111         MAX77843_MUIC_CHG_NONE = 0,
 112         MAX77843_MUIC_CHG_USB,
 113         MAX77843_MUIC_CHG_DOWNSTREAM,
 114         MAX77843_MUIC_CHG_DEDICATED,
 115         MAX77843_MUIC_CHG_SPECIAL_500MA,
 116         MAX77843_MUIC_CHG_SPECIAL_1A,
 117         MAX77843_MUIC_CHG_SPECIAL_BIAS,
 118         MAX77843_MUIC_CHG_RESERVED,
 119         MAX77843_MUIC_CHG_GND,
 120         MAX77843_MUIC_CHG_DOCK,
 121 };
 122
 123 enum {
 124         MAX77843_CABLE_USB = 0,
 125         MAX77843_CABLE_USB_HOST,
 126         MAX77843_CABLE_TA,
 127         MAX77843_CABLE_CHARGE_DOWNSTREAM,
 128         MAX77843_CABLE_FAST_CHARGER,
 129         MAX77843_CABLE_SLOW_CHARGER,
 130         MAX77843_CABLE_MHL,
 131         MAX77843_CABLE_DOCK,
 132         MAX77843_CABLE_JIG_USB_ON,
 133         MAX77843_CABLE_JIG_USB_OFF,
 134         MAX77843_CABLE_JIG_UART_ON,
 135         MAX77843_CABLE_JIG_UART_OFF,
 136
 137         MAX77843_CABLE_NUM,
 138 };
 139
 140 static const char *max77843_extcon_cable[] = {
 141         [MAX77843_CABLE_USB]                    = "USB",
 142         [MAX77843_CABLE_USB_HOST]               = "USB-HOST",
 143         [MAX77843_CABLE_TA]                     = "TA",
 144         [MAX77843_CABLE_CHARGE_DOWNSTREAM]      = "CHARGER-DOWNSTREAM",
 145         [MAX77843_CABLE_FAST_CHARGER]           = "FAST-CHARGER",
 146         [MAX77843_CABLE_SLOW_CHARGER]           = "SLOW-CHARGER",
 147         [MAX77843_CABLE_MHL]                    = "MHL",
 148         [MAX77843_CABLE_DOCK]                   = "DOCK",
 149         [MAX77843_CABLE_JIG_USB_ON]             = "JIG-USB-ON",
 150         [MAX77843_CABLE_JIG_USB_OFF]            = "JIG-USB-OFF",
 151         [MAX77843_CABLE_JIG_UART_ON]            = "JIG-UART-ON",
 152         [MAX77843_CABLE_JIG_UART_OFF]           = "JIG-UART-OFF",
 153         NULL,
 154 };
 155
 156 struct max77843_muic_irq {
 157         unsigned int irq;
 158         const char *name;
 159         unsigned int virq;
 160 };
 161
 162 static struct max77843_muic_irq max77843_muic_irqs[] = {
 163         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 164         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 165         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 166         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 167         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 168         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 169         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 170         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 171         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 172         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 173         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 174         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 175         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 176         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 177         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 178         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 179 };
 180
 181 static const struct regmap_config max77843_muic_regmap_config = {
 182         .reg_bits       = 8,
 183         .val_bits       = 8,
 184         .max_register   = MAX77843_MUIC_REG_END,
 185 };
 186
 187 static const struct regmap_irq max77843_muic_irq[] = {
 188         /* INT1 interrupt */
 189         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 190         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 191         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 192
 193         /* INT2 interrupt */
 194         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 195         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 196         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 197         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 198         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 199
 200         /* INT3 interrupt */
 201         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 202         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 203         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 204         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 205         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 206         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 207         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 208         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 209 };
 210
 211 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 212         .name           = "max77843-muic",
 213         .status_base    = MAX77843_MUIC_REG_INT1,
 214         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 215         .mask_invert    = true,
 216         .num_regs       = 3,
 217         .irqs           = max77843_muic_irq,
 218         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 219 };
 220
 221 static int max77843_muic_set_path(struct max77843_muic_info *info,
 222                 u8 val, bool attached, bool nobccomp)
 223 {
 224         struct max77843 *max77843 = info->max77843;
 225         int ret = 0;
 226         unsigned int ctrl1, ctrl2;
 227
 228         if (attached)
 229                 ctrl1 = val;
 230         else
 231                 ctrl1 = CONTROL1_SW_OPEN;
 232
 233         if (nobccomp) {
 234                 /* Disable BC1.2 protocol and force manual switch control */
 235                 ctrl1 |= MAX77843_MUIC_CONTROL1_NOBCCOMP_MASK;
 236         }
 237
 238         ret = regmap_update_bits(max77843->regmap_muic,
 239                         MAX77843_MUIC_REG_CONTROL1,
 240                         CONTROL1_COM_SW | MAX77843_MUIC_CONTROL1_NOBCCOMP_MASK,
 241                         ctrl1);
 242         if (ret < 0) {
 243                 dev_err(info->dev, "Cannot switch MUIC port\n");
 244                 return ret;
 245         }
 246
 247         if (attached)
 248                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 249         else
 250                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 251
 252         ret = regmap_update_bits(max77843->regmap_muic,
 253                         MAX77843_MUIC_REG_CONTROL2,
 254                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 255                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 256         if (ret < 0) {
 257                 dev_err(info->dev, "Cannot update lowpower mode\n");
 258                 return ret;
 259         }
 260
 261         dev_dbg(info->dev,
 262                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 263                 ctrl1, ctrl2, attached ? "attached" : "detached");
 264
 265         return 0;
 266 }
 267
 268 static void max77843_charger_set_otg_vbus(struct max77843_muic_info *info,
 269                  bool on)
 270 {
 271         struct max77843 *max77843 = info->max77843;
 272
 273         /* OTG Cable attached */
 274         if (on) {
 275                 regmap_update_bits(max77843->regmap_chg,
 276                         MAX77843_CHG_REG_CHG_CNFG_00,
 277                         MAX77843_CHG_MODE_MASK,
 278                         MAX77843_CHG_OTG_MASK | MAX77843_CHG_BOOST_MASK);
 279         } else {
 280                 /* OTG Cable detached */
 281                 regmap_update_bits(max77843->regmap_chg,
 282                         MAX77843_CHG_REG_CHG_CNFG_00,
 283                         MAX77843_CHG_MODE_MASK,
 284                         MAX77843_CHG_ENABLE | MAX77843_CHG_BUCK_MASK);
 285         }
 286 }
 287
 288 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 289                 enum max77843_muic_cable_group group, bool *attached)
 290 {
 291         int adc, chg_type, cable_type, gnd_type;
 292
 293         adc = info->status[MAX77843_MUIC_STATUS1] &
 294                         MAX77843_MUIC_STATUS1_ADC_MASK;
 295         adc >>= STATUS1_ADC_SHIFT;
 296
 297         switch (group) {
 298         case MAX77843_CABLE_GROUP_ADC:
 299                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 300                         *attached = false;
 301                         cable_type = info->prev_cable_type;
 302                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 303                 } else {
 304                         *attached = true;
 305                         cable_type = info->prev_cable_type = adc;
 306                 }
 307                 break;
 308         case MAX77843_CABLE_GROUP_CHG:
 309                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 310                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 311
 312                 /* Check GROUND accessory with charger cable */
 313                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 314                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 315                                 /* The following state when charger cable is
 316                                  * disconnected but the GROUND accessory still
 317                                  * connected */
 318                                 *attached = false;
 319                                 cable_type = info->prev_chg_type;
 320                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 321                         } else {
 322
 323                                 /* The following state when charger cable is
 324                                  * connected on the GROUND accessory */
 325                                 *attached = true;
 326                                 cable_type = MAX77843_MUIC_CHG_GND;
 327                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 328                         }
 329                         break;
 330                 }
 331
 332                 if (adc == MAX77843_MUIC_ADC_RESERVED_ACC_3) { /* SmartDock */
 333                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 334                                 *attached = false;
 335                                 cable_type = info->prev_chg_type;
 336                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 337                         } else {
 338                                 *attached = true;
 339                                 cable_type = MAX77843_MUIC_CHG_DOCK;
 340                                 info->prev_chg_type = MAX77843_MUIC_CHG_DOCK;
 341                         }
 342                         break;
 343                 }
 344
 345                 if (adc == MAX77843_MUIC_ADC_RESERVED_ACC_4) {
 346                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 347                                 *attached = false;
 348                                 cable_type = info->prev_chg_type;
 349                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 350                         } else {
 351                                 *attached = true;
 352                                 cable_type = MAX77843_MUIC_CHG_NONE;
 353                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 354                         }
 355                         break;
 356                 }
 357
 358                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 359                         *attached = false;
 360                         cable_type = info->prev_chg_type;
 361                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 362                 } else {
 363                         *attached = true;
 364                         cable_type = info->prev_chg_type = chg_type;
 365                 }
 366                 break;
 367         case MAX77843_CABLE_GROUP_ADC_GND:
 368                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 369                         *attached = false;
 370                         cable_type = info->prev_gnd_type;
 371                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 372                 } else {
 373                         *attached = true;
 374
 375                         /* Offset|ADC1K|VBVolt|
 376                          *    0x1|    0|     0| USB-HOST
 377                          *    0x1|    0|     1| USB-HOST with VB
 378                          *    0x1|    1|     0| MHL
 379                          *    0x1|    1|     1| MHL with VB */
 380                         /* Get ADC1K register bit */
 381                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 382                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 383
 384                         /* Get VBVolt register bit */
 385                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 386                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 387                         gnd_type >>= STATUS2_VBVOLT_SHIFT;
 388
 389                         /* Offset of GND cable */
 390                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 391                         cable_type = info->prev_gnd_type = gnd_type;
 392                 }
 393                 break;
 394         default:
 395                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 396                 cable_type = -EINVAL;
 397                 break;
 398         }
 399
 400         return cable_type;
 401 }
 402
 403 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 404 {
 405         int ret, gnd_cable_type;
 406         bool attached;
 407
 408         gnd_cable_type = max77843_muic_get_cable_type(info,
 409                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 410         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 411                         attached ? "attached" : "detached", gnd_cable_type);
 412
 413         switch (gnd_cable_type) {
 414         case MAX77843_MUIC_GND_USB_HOST:
 415         case MAX77843_MUIC_GND_USB_HOST_VB:
 416                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached,
 417                                              false);
 418                 if (ret < 0)
 419                         return ret;
 420
 421                 extcon_set_cable_state(info->edev, "USB-HOST", attached);
 422                 max77843_charger_set_otg_vbus(info, attached);
 423                 break;
 424         case MAX77843_MUIC_GND_MHL_VB:
 425         case MAX77843_MUIC_GND_MHL:
 426                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached,
 427                                              false);
 428                 if (ret < 0)
 429                         return ret;
 430
 431                 extcon_set_cable_state(info->edev, "MHL", attached);
 432                 break;
 433         default:
 434                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 435                         attached ? "attached" : "detached", gnd_cable_type);
 436                 return -EINVAL;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 443                 int cable_type, bool attached)
 444 {
 445         int ret;
 446
 447         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 448                         attached ? "attached" : "detached", cable_type);
 449
 450         switch (cable_type) {
 451         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 452                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached,
 453                                              false);
 454                 if (ret < 0)
 455                         return ret;
 456                 extcon_set_cable_state(info->edev, "JIG-USB-OFF", attached);
 457                 break;
 458         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 459                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached,
 460                                              false);
 461                 if (ret < 0)
 462                         return ret;
 463                 extcon_set_cable_state(info->edev, "JIG-USB-ON", attached);
 464                 break;
 465         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 466                 ret = max77843_muic_set_path(info, CONTROL1_SW_UART, attached,
 467                                              false);
 468                 if (ret < 0)
 469                         return ret;
 470                 extcon_set_cable_state(info->edev, "JIG-UART-OFF", attached);
 471                 break;
 472         default:
 473                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached,
 474                                              false);
 475                 if (ret < 0)
 476                         return ret;
 477                 break;
 478         }
 479
 480         return 0;
 481 }
 482
 483 static int max77843_muic_dock_handler(struct max77843_muic_info *info,
 484                 bool attached)
 485 {
 486         int ret;
 487
 488         dev_dbg(info->dev, "external connector is %s (adc: 0x10)\n",
 489                         attached ? "attached" : "detached");
 490
 491         ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached,
 492                                      attached);
 493         if (ret < 0)
 494                 return ret;
 495
 496         extcon_set_cable_state(info->edev, "MHL", attached);
 497         extcon_set_cable_state(info->edev, "USB-HOST", attached);
 498         extcon_set_cable_state(info->edev, "DOCK", attached);
 499
 500         return 0;
 501 }
 502
 503 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 504 {
 505         int ret, cable_type;
 506         bool attached;
 507
 508         cable_type = max77843_muic_get_cable_type(info,
 509                         MAX77843_CABLE_GROUP_ADC, &attached);
 510
 511         dev_dbg(info->dev,
 512                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 513                 attached ? "attached" : "detached", cable_type,
 514                 info->prev_cable_type);
 515
 516         switch (cable_type) {
 517         case MAX77843_MUIC_ADC_RESERVED_ACC_3: /* SmartDock */
 518                 ret = max77843_muic_dock_handler(info, attached);
 519                 if (ret < 0)
 520                         return ret;
 521                 break;
 522         case MAX77843_MUIC_ADC_GROUND:
 523         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 524                 ret = max77843_muic_adc_gnd_handler(info);
 525                 if (ret < 0)
 526                         return ret;
 527                 break;
 528         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 529         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 530         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 531                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 532                 if (ret < 0)
 533                         return ret;
 534                 break;
 535         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 536         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 537         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 538         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 539         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 540         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 541         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 542         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 543         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 544         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 545         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 546         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 547         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 548         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 549         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 550         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 551         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 552         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 553         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 554         case MAX77843_MUIC_ADC_UART_CABLE:
 555         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 556         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 557         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 558         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 559         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 560         case MAX77843_MUIC_ADC_OPEN:
 561                 dev_err(info->dev,
 562                         "accessory is %s but it isn't used (adc:0x%x)\n",
 563                         attached ? "attached" : "detached", cable_type);
 564                 return -EAGAIN;
 565         default:
 566                 dev_err(info->dev,
 567                         "failed to detect %s accessory (adc:0x%x)\n",
 568                         attached ? "attached" : "detached", cable_type);
 569                 return -EINVAL;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 576 {
 577         int ret, chg_type, gnd_type;
 578         bool attached;
 579
 580         chg_type = max77843_muic_get_cable_type(info,
 581                         MAX77843_CABLE_GROUP_CHG, &attached);
 582
 583         dev_dbg(info->dev,
 584                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 585                 attached ? "attached" : "detached",
 586                 chg_type, info->prev_chg_type);
 587
 588         switch (chg_type) {
 589         case MAX77843_MUIC_CHG_USB:
 590                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached,
 591                                              false);
 592                 if (ret < 0)
 593                         return ret;
 594
 595                 extcon_set_cable_state(info->edev, "USB", attached);
 596                 break;
 597         case MAX77843_MUIC_CHG_DOWNSTREAM:
 598                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached,
 599                                              false);
 600                 if (ret < 0)
 601                         return ret;
 602
 603                 extcon_set_cable_state(info->edev,
 604                                 "CHARGER-DOWNSTREAM", attached);
 605                 break;
 606         case MAX77843_MUIC_CHG_DEDICATED:
 607                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached,
 608                                              false);
 609                 if (ret < 0)
 610                         return ret;
 611
 612                 extcon_set_cable_state(info->edev, "TA", attached);
 613                 break;
 614         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 615                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached,
 616                                              false);
 617                 if (ret < 0)
 618                         return ret;
 619
 620                 extcon_set_cable_state(info->edev, "SLOW-CHAREGER", attached);
 621                 break;
 622         case MAX77843_MUIC_CHG_SPECIAL_1A:
 623                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached,
 624                                              false);
 625                 if (ret < 0)
 626                         return ret;
 627
 628                 extcon_set_cable_state(info->edev, "FAST-CHARGER", attached);
 629                 break;
 630         case MAX77843_MUIC_CHG_GND:
 631                 gnd_type = max77843_muic_get_cable_type(info,
 632                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 633
 634                 /* Charger cable on MHL accessory is attach or detach */
 635                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 636                         extcon_set_cable_state(info->edev, "TA", true);
 637                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 638                         extcon_set_cable_state(info->edev, "TA", false);
 639                 break;
 640         case MAX77843_MUIC_CHG_DOCK:
 641                 extcon_set_cable_state(info->edev, "TA", attached);
 642                 break;
 643         case MAX77843_MUIC_CHG_NONE:
 644                 break;
 645         default:
 646                 dev_err(info->dev,
 647                         "failed to detect %s accessory (chg_type:0x%x)\n",
 648                         attached ? "attached" : "detached", chg_type);
 649
 650                 max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached, false);
 651                 return -EINVAL;
 652         }
 653
 654         return 0;
 655 }
 656
 657 static void max77843_muic_irq_work(struct work_struct *work)
 658 {
 659         struct max77843_muic_info *info = container_of(work,
 660                         struct max77843_muic_info, irq_work);
 661         struct max77843 *max77843 = info->max77843;
 662         int ret = 0;
 663
 664         mutex_lock(&info->mutex);
 665
 666         ret = regmap_bulk_read(max77843->regmap_muic,
 667                         MAX77843_MUIC_REG_STATUS1, info->status,
 668                         MAX77843_MUIC_STATUS_NUM);
 669         if (ret) {
 670                 dev_err(info->dev, "Cannot read STATUS registers\n");
 671                 mutex_unlock(&info->mutex);
 672                 return;
 673         }
 674
 675         if (info->irq_adc) {
 676                 ret = max77843_muic_adc_handler(info);
 677                 if (ret)
 678                         dev_err(info->dev, "Unknown cable type\n");
 679                 info->irq_adc = false;
 680         }
 681
 682         if (info->irq_chg) {
 683                 ret = max77843_muic_chg_handler(info);
 684                 if (ret)
 685                         dev_err(info->dev, "Unknown charger type\n");
 686                 info->irq_chg = false;
 687         }
 688
 689         mutex_unlock(&info->mutex);
 690 }
 691
 692 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 693 {
 694         struct max77843_muic_info *info = data;
 695         int i, irq_type = -1;
 696
 697         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 698                 if (irq == max77843_muic_irqs[i].virq)
 699                         irq_type = max77843_muic_irqs[i].irq;
 700
 701         switch (irq_type) {
 702         case MAX77843_MUIC_IRQ_INT1_ADC:
 703         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 704         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 705                 info->irq_adc = true;
 706                 break;
 707         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 708         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 709         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 710         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 711         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 712                 info->irq_chg = true;
 713                 break;
 714         case MAX77843_MUIC_IRQ_INT3_VBADC:
 715         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 716         case MAX77843_MUIC_IRQ_INT3_DNRES:
 717         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 718         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 719         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 720         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 721         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 722                 break;
 723         default:
 724                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 725                 break;
 726         }
 727
 728         schedule_work(&info->irq_work);
 729
 730         return IRQ_HANDLED;
 731 }
 732
 733 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 734 {
 735         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 736                         struct max77843_muic_info, wq_detcable);
 737         struct max77843 *max77843 = info->max77843;
 738         int chg_type, adc, ret;
 739         bool attached;
 740
 741         mutex_lock(&info->mutex);
 742
 743         ret = regmap_bulk_read(max77843->regmap_muic,
 744                         MAX77843_MUIC_REG_STATUS1, info->status,
 745                         MAX77843_MUIC_STATUS_NUM);
 746         if (ret) {
 747                 dev_err(info->dev, "Cannot read STATUS registers\n");
 748                 goto err_cable_wq;
 749         }
 750
 751         adc = max77843_muic_get_cable_type(info,
 752                         MAX77843_CABLE_GROUP_ADC, &attached);
 753         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 754                 ret = max77843_muic_adc_handler(info);
 755                 if (ret < 0) {
 756                         dev_err(info->dev, "Cannot detect accessory\n");
 757                         goto err_cable_wq;
 758                 }
 759         }
 760
 761         chg_type = max77843_muic_get_cable_type(info,
 762                         MAX77843_CABLE_GROUP_CHG, &attached);
 763         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 764                 ret = max77843_muic_chg_handler(info);
 765                 if (ret < 0) {
 766                         dev_err(info->dev, "Cannot detect charger accessory\n");
 767                         goto err_cable_wq;
 768                 }
 769         }
 770
 771 err_cable_wq:
 772         mutex_unlock(&info->mutex);
 773 }
 774
 775 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 776                 enum max77843_muic_adc_debounce_time time)
 777 {
 778         struct max77843 *max77843 = info->max77843;
 779         int ret;
 780
 781         switch (time) {
 782         case MAX77843_DEBOUNCE_TIME_5MS:
 783         case MAX77843_DEBOUNCE_TIME_10MS:
 784         case MAX77843_DEBOUNCE_TIME_25MS:
 785         case MAX77843_DEBOUNCE_TIME_38_62MS:
 786                 ret = regmap_update_bits(max77843->regmap_muic,
 787                                 MAX77843_MUIC_REG_CONTROL4,
 788                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 789                                 time << CONTROL4_ADCDBSET_SHIFT);
 790                 if (ret < 0) {
 791                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 792                         return ret;
 793                 }
 794                 break;
 795         default:
 796                 dev_err(info->dev, "Invalid ADC debounce time\n");
 797                 return -EINVAL;
 798         }
 799
 800         return 0;
 801 }
 802
 803 static int max77843_init_muic_regmap(struct max77843 *max77843)
 804 {
 805         int ret;
 806
 807         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 808                         I2C_ADDR_MUIC);
 809         if (!max77843->i2c_muic) {
 810                 dev_err(&max77843->i2c->dev,
 811                                 "Cannot allocate I2C device for MUIC\n");
 812                 return -ENOMEM;
 813         }
 814
 815         i2c_set_clientdata(max77843->i2c_muic, max77843);
 816
 817         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 818                         &max77843_muic_regmap_config);
 819         if (IS_ERR(max77843->regmap_muic)) {
 820                 ret = PTR_ERR(max77843->regmap_muic);
 821                 goto err_muic_i2c;
 822         }
 823
 824         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 825                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 826                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 827         if (ret < 0) {
 828                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 829                 goto err_muic_i2c;
 830         }
 831
 832         return 0;
 833
 834 err_muic_i2c:
 835         i2c_unregister_device(max77843->i2c_muic);
 836
 837         return ret;
 838 }
 839
 840 static int max77843_muic_probe(struct platform_device *pdev)
 841 {
 842         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 843         struct max77843_muic_info *info;
 844         unsigned int id;
 845         int i, ret;
 846         u8 temp_reg[MAX77843_MUIC_IRQ_NUM];
 847
 848         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 849         if (!info)
 850                 return -ENOMEM;
 851
 852         info->dev = &pdev->dev;
 853         info->max77843 = max77843;
 854
 855         platform_set_drvdata(pdev, info);
 856         mutex_init(&info->mutex);
 857
 858         /* Initialize i2c and regmap */
 859         ret = max77843_init_muic_regmap(max77843);
 860         if (ret) {
 861                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 862                 return ret;
 863         }
 864
 865         /* JIG pin controlled by Auto detection */
 866         ret = regmap_update_bits(max77843->regmap_muic,
 867                         MAX77843_MUIC_REG_CONTROL3,
 868                         MAX77843_MUIC_CONTROL3_JIGSET_MASK,
 869                         0 << CONTROL3_JIGSET_SHIFT);
 870         if (ret)
 871                 dev_warn(&pdev->dev, "Failed to update MUIC_REG_CONTRO3\n");
 872
 873         /* Turn off auto detection configuration */
 874         ret = regmap_update_bits(max77843->regmap_muic,
 875                         MAX77843_MUIC_REG_CONTROL4,
 876                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 877                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 878                         CONTROL4_AUTO_DISABLE);
 879
 880         /* Initialize extcon device */
 881         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 882                         max77843_extcon_cable);
 883         if (IS_ERR(info->edev)) {
 884                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 885                 ret = -ENODEV;
 886                 goto err_muic_irq;
 887         }
 888
 889         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 890         if (ret) {
 891                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 892                 goto err_muic_irq;
 893         }
 894
 895         /* Set ADC debounce time */
 896         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 897
 898         /* Set initial path for UART */
 899         max77843_muic_set_path(info, CONTROL1_SW_UART, true, false);
 900
 901         /* Check revision number of MUIC device */
 902         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 903         if (ret < 0) {
 904                 dev_err(&pdev->dev, "Failed to read revision number\n");
 905                 goto err_muic_irq;
 906         }
 907         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 908
 909         /* Support virtual irq domain for max77843 MUIC device */
 910         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 911
 912         /* Clear IRQ bits before request IRQs */
 913         ret = regmap_bulk_read(max77843->regmap_muic,
 914                         MAX77843_MUIC_REG_INT1, temp_reg,
 915                         MAX77843_MUIC_IRQ_NUM);
 916         if (ret) {
 917                 dev_err(&pdev->dev, "Failed to Clear IRQ bits\n");
 918                 goto err_muic_irq;
 919         }
 920
 921         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 922                 struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
 923                 unsigned int virq = 0;
 924
 925                 virq = regmap_irq_get_virq(max77843->irq_data_muic,
 926                                 muic_irq->irq);
 927                 if (virq <= 0) {
 928                         ret = -EINVAL;
 929                         goto err_muic_irq;
 930                 }
 931                 muic_irq->virq = virq;
 932
 933                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 934                                 max77843_muic_irq_handler, IRQF_NO_SUSPEND,
 935                                 muic_irq->name, info);
 936                 if (ret) {
 937                         dev_err(&pdev->dev,
 938                                 "Failed to request irq (IRQ: %d, error: %d)\n",
 939                                 muic_irq->irq, ret);
 940                         goto err_muic_irq;
 941                 }
 942         }
 943
 944         /* Detect accessory after completing the initialization of platform */
 945         INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
 946         queue_delayed_work(system_power_efficient_wq,
 947                         &info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
 948
 949         return 0;
 950
 951 err_muic_irq:
 952         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 953         i2c_unregister_device(max77843->i2c_muic);
 954
 955         return ret;
 956 }
 957
 958 static int max77843_muic_remove(struct platform_device *pdev)
 959 {
 960         struct max77843_muic_info *info = platform_get_drvdata(pdev);
 961         struct max77843 *max77843 = info->max77843;
 962
 963         cancel_work_sync(&info->irq_work);
 964         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 965         i2c_unregister_device(max77843->i2c_muic);
 966
 967         return 0;
 968 }
 969
 970 static const struct platform_device_id max77843_muic_id[] = {
 971         { "max77843-muic", },
 972         { /* sentinel */ },
 973 };
 974 MODULE_DEVICE_TABLE(platform, max77843_muic_id);
 975
 976 static struct platform_driver max77843_muic_driver = {
 977         .driver         = {
 978                 .name           = "max77843-muic",
 979         },
 980         .probe          = max77843_muic_probe,
 981         .remove         = max77843_muic_remove,
 982         .id_table       = max77843_muic_id,
 983 };
 984
 985 static int __init max77843_muic_init(void)
 986 {
 987         return platform_driver_register(&max77843_muic_driver);
 988 }
 989 subsys_initcall(max77843_muic_init);
 990
 991 MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
 992 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 993 MODULE_LICENSE("GPL");