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/max77693-common.h>
  19 #include <linux/mfd/max77843-private.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/workqueue.h>
  23
  24 #define DELAY_MS_DEFAULT                15000   /* unit: millisecond */
  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 max77693_dev *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,
  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 };
 121
 122 static const unsigned int max77843_extcon_cable[] = {
 123         EXTCON_USB,
 124         EXTCON_USB_HOST,
 125         EXTCON_CHG_USB_SDP,
 126         EXTCON_CHG_USB_DCP,
 127         EXTCON_CHG_USB_CDP,
 128         EXTCON_CHG_USB_FAST,
 129         EXTCON_CHG_USB_SLOW,
 130         EXTCON_DISP_MHL,
 131         EXTCON_JIG,
 132         EXTCON_NONE,
 133 };
 134
 135 struct max77843_muic_irq {
 136         unsigned int irq;
 137         const char *name;
 138         unsigned int virq;
 139 };
 140
 141 static struct max77843_muic_irq max77843_muic_irqs[] = {
 142         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 143         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 144         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 145         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 146         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 147         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 148         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 149         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 150         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 151         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 152         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 153         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 154         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 155         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 156         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 157         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 158 };
 159
 160 static const struct regmap_config max77843_muic_regmap_config = {
 161         .reg_bits       = 8,
 162         .val_bits       = 8,
 163         .max_register   = MAX77843_MUIC_REG_END,
 164 };
 165
 166 static const struct regmap_irq max77843_muic_irq[] = {
 167         /* INT1 interrupt */
 168         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 169         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 170         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 171
 172         /* INT2 interrupt */
 173         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 174         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 175         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 176         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 177         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 178
 179         /* INT3 interrupt */
 180         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 181         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 182         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 183         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 184         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 185         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 186         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 187         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 188 };
 189
 190 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 191         .name           = "max77843-muic",
 192         .status_base    = MAX77843_MUIC_REG_INT1,
 193         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 194         .mask_invert    = true,
 195         .num_regs       = 3,
 196         .irqs           = max77843_muic_irq,
 197         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 198 };
 199
 200 static int max77843_muic_set_path(struct max77843_muic_info *info,
 201                 u8 val, bool attached)
 202 {
 203         struct max77693_dev *max77843 = info->max77843;
 204         int ret = 0;
 205         unsigned int ctrl1, ctrl2;
 206
 207         if (attached)
 208                 ctrl1 = val;
 209         else
 210                 ctrl1 = MAX77843_MUIC_CONTROL1_SW_OPEN;
 211
 212         ret = regmap_update_bits(max77843->regmap_muic,
 213                         MAX77843_MUIC_REG_CONTROL1,
 214                         MAX77843_MUIC_CONTROL1_COM_SW, ctrl1);
 215         if (ret < 0) {
 216                 dev_err(info->dev, "Cannot switch MUIC port\n");
 217                 return ret;
 218         }
 219
 220         if (attached)
 221                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 222         else
 223                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 224
 225         ret = regmap_update_bits(max77843->regmap_muic,
 226                         MAX77843_MUIC_REG_CONTROL2,
 227                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 228                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 229         if (ret < 0) {
 230                 dev_err(info->dev, "Cannot update lowpower mode\n");
 231                 return ret;
 232         }
 233
 234         dev_dbg(info->dev,
 235                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 236                 ctrl1, ctrl2, attached ? "attached" : "detached");
 237
 238         return 0;
 239 }
 240
 241 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 242                 enum max77843_muic_cable_group group, bool *attached)
 243 {
 244         int adc, chg_type, cable_type, gnd_type;
 245
 246         adc = info->status[MAX77843_MUIC_STATUS1] &
 247                         MAX77843_MUIC_STATUS1_ADC_MASK;
 248         adc >>= MAX77843_MUIC_STATUS1_ADC_SHIFT;
 249
 250         switch (group) {
 251         case MAX77843_CABLE_GROUP_ADC:
 252                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 253                         *attached = false;
 254                         cable_type = info->prev_cable_type;
 255                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 256                 } else {
 257                         *attached = true;
 258                         cable_type = info->prev_cable_type = adc;
 259                 }
 260                 break;
 261         case MAX77843_CABLE_GROUP_CHG:
 262                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 263                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 264
 265                 /* Check GROUND accessory with charger cable */
 266                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 267                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 268                                 /* The following state when charger cable is
 269                                  * disconnected but the GROUND accessory still
 270                                  * connected */
 271                                 *attached = false;
 272                                 cable_type = info->prev_chg_type;
 273                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 274                         } else {
 275
 276                                 /* The following state when charger cable is
 277                                  * connected on the GROUND accessory */
 278                                 *attached = true;
 279                                 cable_type = MAX77843_MUIC_CHG_GND;
 280                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 281                         }
 282                         break;
 283                 }
 284
 285                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 286                         *attached = false;
 287                         cable_type = info->prev_chg_type;
 288                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 289                 } else {
 290                         *attached = true;
 291                         cable_type = info->prev_chg_type = chg_type;
 292                 }
 293                 break;
 294         case MAX77843_CABLE_GROUP_ADC_GND:
 295                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 296                         *attached = false;
 297                         cable_type = info->prev_gnd_type;
 298                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 299                 } else {
 300                         *attached = true;
 301
 302                         /* Offset|ADC1K|VBVolt|
 303                          *    0x1|    0|     0| USB-HOST
 304                          *    0x1|    0|     1| USB-HOST with VB
 305                          *    0x1|    1|     0| MHL
 306                          *    0x1|    1|     1| MHL with VB */
 307                         /* Get ADC1K register bit */
 308                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 309                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 310
 311                         /* Get VBVolt register bit */
 312                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 313                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 314                         gnd_type >>= MAX77843_MUIC_STATUS2_VBVOLT_SHIFT;
 315
 316                         /* Offset of GND cable */
 317                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 318                         cable_type = info->prev_gnd_type = gnd_type;
 319                 }
 320                 break;
 321         default:
 322                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 323                 cable_type = -EINVAL;
 324                 break;
 325         }
 326
 327         return cable_type;
 328 }
 329
 330 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 331 {
 332         int ret, gnd_cable_type;
 333         bool attached;
 334
 335         gnd_cable_type = max77843_muic_get_cable_type(info,
 336                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 337         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 338                         attached ? "attached" : "detached", gnd_cable_type);
 339
 340         switch (gnd_cable_type) {
 341         case MAX77843_MUIC_GND_USB_HOST:
 342         case MAX77843_MUIC_GND_USB_HOST_VB:
 343                 ret = max77843_muic_set_path(info,
 344                                              MAX77843_MUIC_CONTROL1_SW_USB,
 345                                              attached);
 346                 if (ret < 0)
 347                         return ret;
 348
 349                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
 350                 break;
 351         case MAX77843_MUIC_GND_MHL_VB:
 352         case MAX77843_MUIC_GND_MHL:
 353                 ret = max77843_muic_set_path(info,
 354                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 355                                              attached);
 356                 if (ret < 0)
 357                         return ret;
 358
 359                 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
 360                 break;
 361         default:
 362                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 363                         attached ? "attached" : "detached", gnd_cable_type);
 364                 return -EINVAL;
 365         }
 366
 367         return 0;
 368 }
 369
 370 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 371                 int cable_type, bool attached)
 372 {
 373         int ret;
 374         u8 path = MAX77843_MUIC_CONTROL1_SW_OPEN;
 375
 376         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 377                         attached ? "attached" : "detached", cable_type);
 378
 379         switch (cable_type) {
 380         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 381         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 382                 path = MAX77843_MUIC_CONTROL1_SW_USB;
 383                 break;
 384         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 385                 path = MAX77843_MUIC_CONTROL1_SW_UART;
 386                 break;
 387         default:
 388                 return -EINVAL;
 389         }
 390
 391         ret = max77843_muic_set_path(info, path, attached);
 392         if (ret < 0)
 393                 return ret;
 394
 395         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
 396
 397         return 0;
 398 }
 399
 400 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 401 {
 402         int ret, cable_type;
 403         bool attached;
 404
 405         cable_type = max77843_muic_get_cable_type(info,
 406                         MAX77843_CABLE_GROUP_ADC, &attached);
 407
 408         dev_dbg(info->dev,
 409                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 410                 attached ? "attached" : "detached", cable_type,
 411                 info->prev_cable_type);
 412
 413         switch (cable_type) {
 414         case MAX77843_MUIC_ADC_GROUND:
 415                 ret = max77843_muic_adc_gnd_handler(info);
 416                 if (ret < 0)
 417                         return ret;
 418                 break;
 419         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 420         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 421         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 422                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 423                 if (ret < 0)
 424                         return ret;
 425                 break;
 426         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 427         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 428         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 429         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 430         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 431         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 432         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 433         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 434         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 435         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 436         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 437         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 438         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 439         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 440         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 441         case MAX77843_MUIC_ADC_RESERVED_ACC_3:
 442         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 443         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 444         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 445         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 446         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 447         case MAX77843_MUIC_ADC_UART_CABLE:
 448         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 449         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 450         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 451         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 452         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 453         case MAX77843_MUIC_ADC_OPEN:
 454                 dev_err(info->dev,
 455                         "accessory is %s but it isn't used (adc:0x%x)\n",
 456                         attached ? "attached" : "detached", cable_type);
 457                 return -EAGAIN;
 458         default:
 459                 dev_err(info->dev,
 460                         "failed to detect %s accessory (adc:0x%x)\n",
 461                         attached ? "attached" : "detached", cable_type);
 462                 return -EINVAL;
 463         }
 464
 465         return 0;
 466 }
 467
 468 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 469 {
 470         int ret, chg_type, gnd_type;
 471         bool attached;
 472
 473         chg_type = max77843_muic_get_cable_type(info,
 474                         MAX77843_CABLE_GROUP_CHG, &attached);
 475
 476         dev_dbg(info->dev,
 477                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 478                 attached ? "attached" : "detached",
 479                 chg_type, info->prev_chg_type);
 480
 481         switch (chg_type) {
 482         case MAX77843_MUIC_CHG_USB:
 483                 ret = max77843_muic_set_path(info,
 484                                              MAX77843_MUIC_CONTROL1_SW_USB,
 485                                              attached);
 486                 if (ret < 0)
 487                         return ret;
 488
 489                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
 490                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 491                                         attached);
 492                 break;
 493         case MAX77843_MUIC_CHG_DOWNSTREAM:
 494                 ret = max77843_muic_set_path(info,
 495                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 496                                              attached);
 497                 if (ret < 0)
 498                         return ret;
 499
 500                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
 501                                         attached);
 502                 break;
 503         case MAX77843_MUIC_CHG_DEDICATED:
 504                 ret = max77843_muic_set_path(info,
 505                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 506                                              attached);
 507                 if (ret < 0)
 508                         return ret;
 509
 510                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 511                                         attached);
 512                 break;
 513         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 514                 ret = max77843_muic_set_path(info,
 515                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 516                                              attached);
 517                 if (ret < 0)
 518                         return ret;
 519
 520                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
 521                                         attached);
 522                 break;
 523         case MAX77843_MUIC_CHG_SPECIAL_1A:
 524                 ret = max77843_muic_set_path(info,
 525                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 526                                              attached);
 527                 if (ret < 0)
 528                         return ret;
 529
 530                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
 531                                         attached);
 532                 break;
 533         case MAX77843_MUIC_CHG_GND:
 534                 gnd_type = max77843_muic_get_cable_type(info,
 535                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 536
 537                 /* Charger cable on MHL accessory is attach or detach */
 538                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 539                         extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 540                                                 true);
 541                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 542                         extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 543                                                 false);
 544                 break;
 545         case MAX77843_MUIC_CHG_NONE:
 546                 break;
 547         default:
 548                 dev_err(info->dev,
 549                         "failed to detect %s accessory (chg_type:0x%x)\n",
 550                         attached ? "attached" : "detached", chg_type);
 551
 552                 max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_OPEN,
 553                                        attached);
 554                 return -EINVAL;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static void max77843_muic_irq_work(struct work_struct *work)
 561 {
 562         struct max77843_muic_info *info = container_of(work,
 563                         struct max77843_muic_info, irq_work);
 564         struct max77693_dev *max77843 = info->max77843;
 565         int ret = 0;
 566
 567         mutex_lock(&info->mutex);
 568
 569         ret = regmap_bulk_read(max77843->regmap_muic,
 570                         MAX77843_MUIC_REG_STATUS1, info->status,
 571                         MAX77843_MUIC_STATUS_NUM);
 572         if (ret) {
 573                 dev_err(info->dev, "Cannot read STATUS registers\n");
 574                 mutex_unlock(&info->mutex);
 575                 return;
 576         }
 577
 578         if (info->irq_adc) {
 579                 ret = max77843_muic_adc_handler(info);
 580                 if (ret)
 581                         dev_err(info->dev, "Unknown cable type\n");
 582                 info->irq_adc = false;
 583         }
 584
 585         if (info->irq_chg) {
 586                 ret = max77843_muic_chg_handler(info);
 587                 if (ret)
 588                         dev_err(info->dev, "Unknown charger type\n");
 589                 info->irq_chg = false;
 590         }
 591
 592         mutex_unlock(&info->mutex);
 593 }
 594
 595 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 596 {
 597         struct max77843_muic_info *info = data;
 598         int i, irq_type = -1;
 599
 600         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 601                 if (irq == max77843_muic_irqs[i].virq)
 602                         irq_type = max77843_muic_irqs[i].irq;
 603
 604         switch (irq_type) {
 605         case MAX77843_MUIC_IRQ_INT1_ADC:
 606         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 607         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 608                 info->irq_adc = true;
 609                 break;
 610         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 611         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 612         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 613         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 614         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 615                 info->irq_chg = true;
 616                 break;
 617         case MAX77843_MUIC_IRQ_INT3_VBADC:
 618         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 619         case MAX77843_MUIC_IRQ_INT3_DNRES:
 620         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 621         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 622         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 623         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 624         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 625                 break;
 626         default:
 627                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 628                 break;
 629         }
 630
 631         schedule_work(&info->irq_work);
 632
 633         return IRQ_HANDLED;
 634 }
 635
 636 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 637 {
 638         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 639                         struct max77843_muic_info, wq_detcable);
 640         struct max77693_dev *max77843 = info->max77843;
 641         int chg_type, adc, ret;
 642         bool attached;
 643
 644         mutex_lock(&info->mutex);
 645
 646         ret = regmap_bulk_read(max77843->regmap_muic,
 647                         MAX77843_MUIC_REG_STATUS1, info->status,
 648                         MAX77843_MUIC_STATUS_NUM);
 649         if (ret) {
 650                 dev_err(info->dev, "Cannot read STATUS registers\n");
 651                 goto err_cable_wq;
 652         }
 653
 654         adc = max77843_muic_get_cable_type(info,
 655                         MAX77843_CABLE_GROUP_ADC, &attached);
 656         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 657                 ret = max77843_muic_adc_handler(info);
 658                 if (ret < 0) {
 659                         dev_err(info->dev, "Cannot detect accessory\n");
 660                         goto err_cable_wq;
 661                 }
 662         }
 663
 664         chg_type = max77843_muic_get_cable_type(info,
 665                         MAX77843_CABLE_GROUP_CHG, &attached);
 666         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 667                 ret = max77843_muic_chg_handler(info);
 668                 if (ret < 0) {
 669                         dev_err(info->dev, "Cannot detect charger accessory\n");
 670                         goto err_cable_wq;
 671                 }
 672         }
 673
 674 err_cable_wq:
 675         mutex_unlock(&info->mutex);
 676 }
 677
 678 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 679                 enum max77843_muic_adc_debounce_time time)
 680 {
 681         struct max77693_dev *max77843 = info->max77843;
 682         int ret;
 683
 684         switch (time) {
 685         case MAX77843_DEBOUNCE_TIME_5MS:
 686         case MAX77843_DEBOUNCE_TIME_10MS:
 687         case MAX77843_DEBOUNCE_TIME_25MS:
 688         case MAX77843_DEBOUNCE_TIME_38_62MS:
 689                 ret = regmap_update_bits(max77843->regmap_muic,
 690                                 MAX77843_MUIC_REG_CONTROL4,
 691                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 692                                 time << MAX77843_MUIC_CONTROL4_ADCDBSET_SHIFT);
 693                 if (ret < 0) {
 694                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 695                         return ret;
 696                 }
 697                 break;
 698         default:
 699                 dev_err(info->dev, "Invalid ADC debounce time\n");
 700                 return -EINVAL;
 701         }
 702
 703         return 0;
 704 }
 705
 706 static int max77843_init_muic_regmap(struct max77693_dev *max77843)
 707 {
 708         int ret;
 709
 710         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 711                         I2C_ADDR_MUIC);
 712         if (!max77843->i2c_muic) {
 713                 dev_err(&max77843->i2c->dev,
 714                                 "Cannot allocate I2C device for MUIC\n");
 715                 return -ENOMEM;
 716         }
 717
 718         i2c_set_clientdata(max77843->i2c_muic, max77843);
 719
 720         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 721                         &max77843_muic_regmap_config);
 722         if (IS_ERR(max77843->regmap_muic)) {
 723                 ret = PTR_ERR(max77843->regmap_muic);
 724                 goto err_muic_i2c;
 725         }
 726
 727         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 728                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 729                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 730         if (ret < 0) {
 731                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 732                 goto err_muic_i2c;
 733         }
 734
 735         return 0;
 736
 737 err_muic_i2c:
 738         i2c_unregister_device(max77843->i2c_muic);
 739
 740         return ret;
 741 }
 742
 743 static int max77843_muic_probe(struct platform_device *pdev)
 744 {
 745         struct max77693_dev *max77843 = dev_get_drvdata(pdev->dev.parent);
 746         struct max77843_muic_info *info;
 747         unsigned int id;
 748         int i, ret;
 749
 750         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 751         if (!info)
 752                 return -ENOMEM;
 753
 754         info->dev = &pdev->dev;
 755         info->max77843 = max77843;
 756
 757         platform_set_drvdata(pdev, info);
 758         mutex_init(&info->mutex);
 759
 760         /* Initialize i2c and regmap */
 761         ret = max77843_init_muic_regmap(max77843);
 762         if (ret) {
 763                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 764                 return ret;
 765         }
 766
 767         /* Turn off auto detection configuration */
 768         ret = regmap_update_bits(max77843->regmap_muic,
 769                         MAX77843_MUIC_REG_CONTROL4,
 770                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 771                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 772                         CONTROL4_AUTO_DISABLE);
 773
 774         /* Initialize extcon device */
 775         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 776                         max77843_extcon_cable);
 777         if (IS_ERR(info->edev)) {
 778                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 779                 ret = -ENODEV;
 780                 goto err_muic_irq;
 781         }
 782
 783         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 784         if (ret) {
 785                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 786                 goto err_muic_irq;
 787         }
 788
 789         /* Set ADC debounce time */
 790         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 791
 792         /* Set initial path for UART */
 793         max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_UART, true);
 794
 795         /* Check revision number of MUIC device */
 796         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 797         if (ret < 0) {
 798                 dev_err(&pdev->dev, "Failed to read revision number\n");
 799                 goto err_muic_irq;
 800         }
 801         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 802
 803         /* Support virtual irq domain for max77843 MUIC device */
 804         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 805
 806         /* Clear IRQ bits before request IRQs */
 807         ret = regmap_bulk_read(max77843->regmap_muic,
 808                         MAX77843_MUIC_REG_INT1, info->status,
 809                         MAX77843_MUIC_STATUS_NUM);
 810         if (ret) {
 811                 dev_err(&pdev->dev, "Failed to Clear IRQ bits\n");
 812                 goto err_muic_irq;
 813         }
 814
 815         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 816                 struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
 817                 int virq = 0;
 818
 819                 virq = regmap_irq_get_virq(max77843->irq_data_muic,
 820                                 muic_irq->irq);
 821                 if (virq <= 0) {
 822                         ret = -EINVAL;
 823                         goto err_muic_irq;
 824                 }
 825                 muic_irq->virq = virq;
 826
 827                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 828                                 max77843_muic_irq_handler, IRQF_NO_SUSPEND,
 829                                 muic_irq->name, info);
 830                 if (ret) {
 831                         dev_err(&pdev->dev,
 832                                 "Failed to request irq (IRQ: %d, error: %d)\n",
 833                                 muic_irq->irq, ret);
 834                         goto err_muic_irq;
 835                 }
 836         }
 837
 838         /* Detect accessory after completing the initialization of platform */
 839         INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
 840         queue_delayed_work(system_power_efficient_wq,
 841                         &info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
 842
 843         return 0;
 844
 845 err_muic_irq:
 846         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 847         i2c_unregister_device(max77843->i2c_muic);
 848
 849         return ret;
 850 }
 851
 852 static int max77843_muic_remove(struct platform_device *pdev)
 853 {
 854         struct max77843_muic_info *info = platform_get_drvdata(pdev);
 855         struct max77693_dev *max77843 = info->max77843;
 856
 857         cancel_work_sync(&info->irq_work);
 858         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 859         i2c_unregister_device(max77843->i2c_muic);
 860
 861         return 0;
 862 }
 863
 864 static const struct platform_device_id max77843_muic_id[] = {
 865         { "max77843-muic", },
 866         { /* sentinel */ },
 867 };
 868 MODULE_DEVICE_TABLE(platform, max77843_muic_id);
 869
 870 static struct platform_driver max77843_muic_driver = {
 871         .driver         = {
 872                 .name           = "max77843-muic",
 873         },
 874         .probe          = max77843_muic_probe,
 875         .remove         = max77843_muic_remove,
 876         .id_table       = max77843_muic_id,
 877 };
 878
 879 static int __init max77843_muic_init(void)
 880 {
 881         return platform_driver_register(&max77843_muic_driver);
 882 }
 883 subsys_initcall(max77843_muic_init);
 884
 885 MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
 886 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 887 MODULE_LICENSE("GPL");