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_TA,
 126         EXTCON_CHARGE_DOWNSTREAM,
 127         EXTCON_FAST_CHARGER,
 128         EXTCON_SLOW_CHARGER,
 129         EXTCON_MHL,
 130         EXTCON_JIG,
 131         EXTCON_NONE,
 132 };
 133
 134 struct max77843_muic_irq {
 135         unsigned int irq;
 136         const char *name;
 137         unsigned int virq;
 138 };
 139
 140 static struct max77843_muic_irq max77843_muic_irqs[] = {
 141         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 142         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 143         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 144         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 145         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 146         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 147         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 148         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 149         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 150         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 151         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 152         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 153         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 154         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 155         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 156         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 157 };
 158
 159 static const struct regmap_config max77843_muic_regmap_config = {
 160         .reg_bits       = 8,
 161         .val_bits       = 8,
 162         .max_register   = MAX77843_MUIC_REG_END,
 163 };
 164
 165 static const struct regmap_irq max77843_muic_irq[] = {
 166         /* INT1 interrupt */
 167         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 168         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 169         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 170
 171         /* INT2 interrupt */
 172         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 173         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 174         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 175         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 176         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 177
 178         /* INT3 interrupt */
 179         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 180         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 181         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 182         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 183         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 184         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 185         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 186         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 187 };
 188
 189 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 190         .name           = "max77843-muic",
 191         .status_base    = MAX77843_MUIC_REG_INT1,
 192         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 193         .mask_invert    = true,
 194         .num_regs       = 3,
 195         .irqs           = max77843_muic_irq,
 196         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 197 };
 198
 199 static int max77843_muic_set_path(struct max77843_muic_info *info,
 200                 u8 val, bool attached)
 201 {
 202         struct max77693_dev *max77843 = info->max77843;
 203         int ret = 0;
 204         unsigned int ctrl1, ctrl2;
 205
 206         if (attached)
 207                 ctrl1 = val;
 208         else
 209                 ctrl1 = MAX77843_MUIC_CONTROL1_SW_OPEN;
 210
 211         ret = regmap_update_bits(max77843->regmap_muic,
 212                         MAX77843_MUIC_REG_CONTROL1,
 213                         MAX77843_MUIC_CONTROL1_COM_SW, ctrl1);
 214         if (ret < 0) {
 215                 dev_err(info->dev, "Cannot switch MUIC port\n");
 216                 return ret;
 217         }
 218
 219         if (attached)
 220                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 221         else
 222                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 223
 224         ret = regmap_update_bits(max77843->regmap_muic,
 225                         MAX77843_MUIC_REG_CONTROL2,
 226                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 227                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 228         if (ret < 0) {
 229                 dev_err(info->dev, "Cannot update lowpower mode\n");
 230                 return ret;
 231         }
 232
 233         dev_dbg(info->dev,
 234                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 235                 ctrl1, ctrl2, attached ? "attached" : "detached");
 236
 237         return 0;
 238 }
 239
 240 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 241                 enum max77843_muic_cable_group group, bool *attached)
 242 {
 243         int adc, chg_type, cable_type, gnd_type;
 244
 245         adc = info->status[MAX77843_MUIC_STATUS1] &
 246                         MAX77843_MUIC_STATUS1_ADC_MASK;
 247         adc >>= MAX77843_MUIC_STATUS1_ADC_SHIFT;
 248
 249         switch (group) {
 250         case MAX77843_CABLE_GROUP_ADC:
 251                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 252                         *attached = false;
 253                         cable_type = info->prev_cable_type;
 254                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 255                 } else {
 256                         *attached = true;
 257                         cable_type = info->prev_cable_type = adc;
 258                 }
 259                 break;
 260         case MAX77843_CABLE_GROUP_CHG:
 261                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 262                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 263
 264                 /* Check GROUND accessory with charger cable */
 265                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 266                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 267                                 /* The following state when charger cable is
 268                                  * disconnected but the GROUND accessory still
 269                                  * connected */
 270                                 *attached = false;
 271                                 cable_type = info->prev_chg_type;
 272                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 273                         } else {
 274
 275                                 /* The following state when charger cable is
 276                                  * connected on the GROUND accessory */
 277                                 *attached = true;
 278                                 cable_type = MAX77843_MUIC_CHG_GND;
 279                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 280                         }
 281                         break;
 282                 }
 283
 284                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 285                         *attached = false;
 286                         cable_type = info->prev_chg_type;
 287                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 288                 } else {
 289                         *attached = true;
 290                         cable_type = info->prev_chg_type = chg_type;
 291                 }
 292                 break;
 293         case MAX77843_CABLE_GROUP_ADC_GND:
 294                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 295                         *attached = false;
 296                         cable_type = info->prev_gnd_type;
 297                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 298                 } else {
 299                         *attached = true;
 300
 301                         /* Offset|ADC1K|VBVolt|
 302                          *    0x1|    0|     0| USB-HOST
 303                          *    0x1|    0|     1| USB-HOST with VB
 304                          *    0x1|    1|     0| MHL
 305                          *    0x1|    1|     1| MHL with VB */
 306                         /* Get ADC1K register bit */
 307                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 308                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 309
 310                         /* Get VBVolt register bit */
 311                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 312                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 313                         gnd_type >>= MAX77843_MUIC_STATUS2_VBVOLT_SHIFT;
 314
 315                         /* Offset of GND cable */
 316                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 317                         cable_type = info->prev_gnd_type = gnd_type;
 318                 }
 319                 break;
 320         default:
 321                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 322                 cable_type = -EINVAL;
 323                 break;
 324         }
 325
 326         return cable_type;
 327 }
 328
 329 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 330 {
 331         int ret, gnd_cable_type;
 332         bool attached;
 333
 334         gnd_cable_type = max77843_muic_get_cable_type(info,
 335                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 336         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 337                         attached ? "attached" : "detached", gnd_cable_type);
 338
 339         switch (gnd_cable_type) {
 340         case MAX77843_MUIC_GND_USB_HOST:
 341         case MAX77843_MUIC_GND_USB_HOST_VB:
 342                 ret = max77843_muic_set_path(info,
 343                                              MAX77843_MUIC_CONTROL1_SW_USB,
 344                                              attached);
 345                 if (ret < 0)
 346                         return ret;
 347
 348                 extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, attached);
 349                 break;
 350         case MAX77843_MUIC_GND_MHL_VB:
 351         case MAX77843_MUIC_GND_MHL:
 352                 ret = max77843_muic_set_path(info,
 353                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 354                                              attached);
 355                 if (ret < 0)
 356                         return ret;
 357
 358                 extcon_set_cable_state_(info->edev, EXTCON_MHL, attached);
 359                 break;
 360         default:
 361                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 362                         attached ? "attached" : "detached", gnd_cable_type);
 363                 return -EINVAL;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 370                 int cable_type, bool attached)
 371 {
 372         int ret;
 373         u8 path = MAX77843_MUIC_CONTROL1_SW_OPEN;
 374
 375         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 376                         attached ? "attached" : "detached", cable_type);
 377
 378         switch (cable_type) {
 379         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 380         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 381                 path = MAX77843_MUIC_CONTROL1_SW_USB;
 382                 break;
 383         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 384                 path = MAX77843_MUIC_CONTROL1_SW_UART;
 385                 break;
 386         default:
 387                 return -EINVAL;
 388         }
 389
 390         ret = max77843_muic_set_path(info, path, attached);
 391         if (ret < 0)
 392                 return ret;
 393
 394         extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
 395
 396         return 0;
 397 }
 398
 399 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 400 {
 401         int ret, cable_type;
 402         bool attached;
 403
 404         cable_type = max77843_muic_get_cable_type(info,
 405                         MAX77843_CABLE_GROUP_ADC, &attached);
 406
 407         dev_dbg(info->dev,
 408                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 409                 attached ? "attached" : "detached", cable_type,
 410                 info->prev_cable_type);
 411
 412         switch (cable_type) {
 413         case MAX77843_MUIC_ADC_GROUND:
 414                 ret = max77843_muic_adc_gnd_handler(info);
 415                 if (ret < 0)
 416                         return ret;
 417                 break;
 418         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 419         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 420         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 421                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 422                 if (ret < 0)
 423                         return ret;
 424                 break;
 425         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 426         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 427         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 428         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 429         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 430         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 431         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 432         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 433         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 434         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 435         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 436         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 437         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 438         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 439         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 440         case MAX77843_MUIC_ADC_RESERVED_ACC_3:
 441         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 442         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 443         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 444         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 445         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 446         case MAX77843_MUIC_ADC_UART_CABLE:
 447         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 448         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 449         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 450         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 451         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 452         case MAX77843_MUIC_ADC_OPEN:
 453                 dev_err(info->dev,
 454                         "accessory is %s but it isn't used (adc:0x%x)\n",
 455                         attached ? "attached" : "detached", cable_type);
 456                 return -EAGAIN;
 457         default:
 458                 dev_err(info->dev,
 459                         "failed to detect %s accessory (adc:0x%x)\n",
 460                         attached ? "attached" : "detached", cable_type);
 461                 return -EINVAL;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 468 {
 469         int ret, chg_type, gnd_type;
 470         bool attached;
 471
 472         chg_type = max77843_muic_get_cable_type(info,
 473                         MAX77843_CABLE_GROUP_CHG, &attached);
 474
 475         dev_dbg(info->dev,
 476                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 477                 attached ? "attached" : "detached",
 478                 chg_type, info->prev_chg_type);
 479
 480         switch (chg_type) {
 481         case MAX77843_MUIC_CHG_USB:
 482                 ret = max77843_muic_set_path(info,
 483                                              MAX77843_MUIC_CONTROL1_SW_USB,
 484                                              attached);
 485                 if (ret < 0)
 486                         return ret;
 487
 488                 extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
 489                 break;
 490         case MAX77843_MUIC_CHG_DOWNSTREAM:
 491                 ret = max77843_muic_set_path(info,
 492                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 493                                              attached);
 494                 if (ret < 0)
 495                         return ret;
 496
 497                 extcon_set_cable_state_(info->edev, EXTCON_CHARGE_DOWNSTREAM,
 498                                         attached);
 499                 break;
 500         case MAX77843_MUIC_CHG_DEDICATED:
 501                 ret = max77843_muic_set_path(info,
 502                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 503                                              attached);
 504                 if (ret < 0)
 505                         return ret;
 506
 507                 extcon_set_cable_state_(info->edev, EXTCON_TA, attached);
 508                 break;
 509         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 510                 ret = max77843_muic_set_path(info,
 511                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 512                                              attached);
 513                 if (ret < 0)
 514                         return ret;
 515
 516                 extcon_set_cable_state_(info->edev, EXTCON_SLOW_CHARGER,
 517                                         attached);
 518                 break;
 519         case MAX77843_MUIC_CHG_SPECIAL_1A:
 520                 ret = max77843_muic_set_path(info,
 521                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 522                                              attached);
 523                 if (ret < 0)
 524                         return ret;
 525
 526                 extcon_set_cable_state_(info->edev, EXTCON_FAST_CHARGER,
 527                                         attached);
 528                 break;
 529         case MAX77843_MUIC_CHG_GND:
 530                 gnd_type = max77843_muic_get_cable_type(info,
 531                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 532
 533                 /* Charger cable on MHL accessory is attach or detach */
 534                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 535                         extcon_set_cable_state_(info->edev, EXTCON_TA, true);
 536                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 537                         extcon_set_cable_state_(info->edev, EXTCON_TA, false);
 538                 break;
 539         case MAX77843_MUIC_CHG_NONE:
 540                 break;
 541         default:
 542                 dev_err(info->dev,
 543                         "failed to detect %s accessory (chg_type:0x%x)\n",
 544                         attached ? "attached" : "detached", chg_type);
 545
 546                 max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_OPEN,
 547                                        attached);
 548                 return -EINVAL;
 549         }
 550
 551         return 0;
 552 }
 553
 554 static void max77843_muic_irq_work(struct work_struct *work)
 555 {
 556         struct max77843_muic_info *info = container_of(work,
 557                         struct max77843_muic_info, irq_work);
 558         struct max77693_dev *max77843 = info->max77843;
 559         int ret = 0;
 560
 561         mutex_lock(&info->mutex);
 562
 563         ret = regmap_bulk_read(max77843->regmap_muic,
 564                         MAX77843_MUIC_REG_STATUS1, info->status,
 565                         MAX77843_MUIC_STATUS_NUM);
 566         if (ret) {
 567                 dev_err(info->dev, "Cannot read STATUS registers\n");
 568                 mutex_unlock(&info->mutex);
 569                 return;
 570         }
 571
 572         if (info->irq_adc) {
 573                 ret = max77843_muic_adc_handler(info);
 574                 if (ret)
 575                         dev_err(info->dev, "Unknown cable type\n");
 576                 info->irq_adc = false;
 577         }
 578
 579         if (info->irq_chg) {
 580                 ret = max77843_muic_chg_handler(info);
 581                 if (ret)
 582                         dev_err(info->dev, "Unknown charger type\n");
 583                 info->irq_chg = false;
 584         }
 585
 586         mutex_unlock(&info->mutex);
 587 }
 588
 589 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 590 {
 591         struct max77843_muic_info *info = data;
 592         int i, irq_type = -1;
 593
 594         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 595                 if (irq == max77843_muic_irqs[i].virq)
 596                         irq_type = max77843_muic_irqs[i].irq;
 597
 598         switch (irq_type) {
 599         case MAX77843_MUIC_IRQ_INT1_ADC:
 600         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 601         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 602                 info->irq_adc = true;
 603                 break;
 604         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 605         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 606         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 607         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 608         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 609                 info->irq_chg = true;
 610                 break;
 611         case MAX77843_MUIC_IRQ_INT3_VBADC:
 612         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 613         case MAX77843_MUIC_IRQ_INT3_DNRES:
 614         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 615         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 616         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 617         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 618         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 619                 break;
 620         default:
 621                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 622                 break;
 623         }
 624
 625         schedule_work(&info->irq_work);
 626
 627         return IRQ_HANDLED;
 628 }
 629
 630 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 631 {
 632         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 633                         struct max77843_muic_info, wq_detcable);
 634         struct max77693_dev *max77843 = info->max77843;
 635         int chg_type, adc, ret;
 636         bool attached;
 637
 638         mutex_lock(&info->mutex);
 639
 640         ret = regmap_bulk_read(max77843->regmap_muic,
 641                         MAX77843_MUIC_REG_STATUS1, info->status,
 642                         MAX77843_MUIC_STATUS_NUM);
 643         if (ret) {
 644                 dev_err(info->dev, "Cannot read STATUS registers\n");
 645                 goto err_cable_wq;
 646         }
 647
 648         adc = max77843_muic_get_cable_type(info,
 649                         MAX77843_CABLE_GROUP_ADC, &attached);
 650         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 651                 ret = max77843_muic_adc_handler(info);
 652                 if (ret < 0) {
 653                         dev_err(info->dev, "Cannot detect accessory\n");
 654                         goto err_cable_wq;
 655                 }
 656         }
 657
 658         chg_type = max77843_muic_get_cable_type(info,
 659                         MAX77843_CABLE_GROUP_CHG, &attached);
 660         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 661                 ret = max77843_muic_chg_handler(info);
 662                 if (ret < 0) {
 663                         dev_err(info->dev, "Cannot detect charger accessory\n");
 664                         goto err_cable_wq;
 665                 }
 666         }
 667
 668 err_cable_wq:
 669         mutex_unlock(&info->mutex);
 670 }
 671
 672 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 673                 enum max77843_muic_adc_debounce_time time)
 674 {
 675         struct max77693_dev *max77843 = info->max77843;
 676         int ret;
 677
 678         switch (time) {
 679         case MAX77843_DEBOUNCE_TIME_5MS:
 680         case MAX77843_DEBOUNCE_TIME_10MS:
 681         case MAX77843_DEBOUNCE_TIME_25MS:
 682         case MAX77843_DEBOUNCE_TIME_38_62MS:
 683                 ret = regmap_update_bits(max77843->regmap_muic,
 684                                 MAX77843_MUIC_REG_CONTROL4,
 685                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 686                                 time << MAX77843_MUIC_CONTROL4_ADCDBSET_SHIFT);
 687                 if (ret < 0) {
 688                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 689                         return ret;
 690                 }
 691                 break;
 692         default:
 693                 dev_err(info->dev, "Invalid ADC debounce time\n");
 694                 return -EINVAL;
 695         }
 696
 697         return 0;
 698 }
 699
 700 static int max77843_init_muic_regmap(struct max77693_dev *max77843)
 701 {
 702         int ret;
 703
 704         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 705                         I2C_ADDR_MUIC);
 706         if (!max77843->i2c_muic) {
 707                 dev_err(&max77843->i2c->dev,
 708                                 "Cannot allocate I2C device for MUIC\n");
 709                 return -ENOMEM;
 710         }
 711
 712         i2c_set_clientdata(max77843->i2c_muic, max77843);
 713
 714         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 715                         &max77843_muic_regmap_config);
 716         if (IS_ERR(max77843->regmap_muic)) {
 717                 ret = PTR_ERR(max77843->regmap_muic);
 718                 goto err_muic_i2c;
 719         }
 720
 721         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 722                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 723                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 724         if (ret < 0) {
 725                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 726                 goto err_muic_i2c;
 727         }
 728
 729         return 0;
 730
 731 err_muic_i2c:
 732         i2c_unregister_device(max77843->i2c_muic);
 733
 734         return ret;
 735 }
 736
 737 static int max77843_muic_probe(struct platform_device *pdev)
 738 {
 739         struct max77693_dev *max77843 = dev_get_drvdata(pdev->dev.parent);
 740         struct max77843_muic_info *info;
 741         unsigned int id;
 742         int i, ret;
 743
 744         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 745         if (!info)
 746                 return -ENOMEM;
 747
 748         info->dev = &pdev->dev;
 749         info->max77843 = max77843;
 750
 751         platform_set_drvdata(pdev, info);
 752         mutex_init(&info->mutex);
 753
 754         /* Initialize i2c and regmap */
 755         ret = max77843_init_muic_regmap(max77843);
 756         if (ret) {
 757                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 758                 return ret;
 759         }
 760
 761         /* Turn off auto detection configuration */
 762         ret = regmap_update_bits(max77843->regmap_muic,
 763                         MAX77843_MUIC_REG_CONTROL4,
 764                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 765                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 766                         CONTROL4_AUTO_DISABLE);
 767
 768         /* Initialize extcon device */
 769         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 770                         max77843_extcon_cable);
 771         if (IS_ERR(info->edev)) {
 772                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 773                 ret = -ENODEV;
 774                 goto err_muic_irq;
 775         }
 776
 777         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 778         if (ret) {
 779                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 780                 goto err_muic_irq;
 781         }
 782
 783         /* Set ADC debounce time */
 784         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 785
 786         /* Set initial path for UART */
 787         max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_UART, true);
 788
 789         /* Check revision number of MUIC device */
 790         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 791         if (ret < 0) {
 792                 dev_err(&pdev->dev, "Failed to read revision number\n");
 793                 goto err_muic_irq;
 794         }
 795         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 796
 797         /* Support virtual irq domain for max77843 MUIC device */
 798         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 799
 800         /* Clear IRQ bits before request IRQs */
 801         ret = regmap_bulk_read(max77843->regmap_muic,
 802                         MAX77843_MUIC_REG_INT1, info->status,
 803                         MAX77843_MUIC_IRQ_NUM);
 804         if (ret) {
 805                 dev_err(&pdev->dev, "Failed to Clear IRQ bits\n");
 806                 goto err_muic_irq;
 807         }
 808
 809         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 810                 struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
 811                 unsigned int virq = 0;
 812
 813                 virq = regmap_irq_get_virq(max77843->irq_data_muic,
 814                                 muic_irq->irq);
 815                 if (virq <= 0) {
 816                         ret = -EINVAL;
 817                         goto err_muic_irq;
 818                 }
 819                 muic_irq->virq = virq;
 820
 821                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 822                                 max77843_muic_irq_handler, IRQF_NO_SUSPEND,
 823                                 muic_irq->name, info);
 824                 if (ret) {
 825                         dev_err(&pdev->dev,
 826                                 "Failed to request irq (IRQ: %d, error: %d)\n",
 827                                 muic_irq->irq, ret);
 828                         goto err_muic_irq;
 829                 }
 830         }
 831
 832         /* Detect accessory after completing the initialization of platform */
 833         INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
 834         queue_delayed_work(system_power_efficient_wq,
 835                         &info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
 836
 837         return 0;
 838
 839 err_muic_irq:
 840         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 841         i2c_unregister_device(max77843->i2c_muic);
 842
 843         return ret;
 844 }
 845
 846 static int max77843_muic_remove(struct platform_device *pdev)
 847 {
 848         struct max77843_muic_info *info = platform_get_drvdata(pdev);
 849         struct max77693_dev *max77843 = info->max77843;
 850
 851         cancel_work_sync(&info->irq_work);
 852         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 853         i2c_unregister_device(max77843->i2c_muic);
 854
 855         return 0;
 856 }
 857
 858 static const struct platform_device_id max77843_muic_id[] = {
 859         { "max77843-muic", },
 860         { /* sentinel */ },
 861 };
 862 MODULE_DEVICE_TABLE(platform, max77843_muic_id);
 863
 864 static struct platform_driver max77843_muic_driver = {
 865         .driver         = {
 866                 .name           = "max77843-muic",
 867         },
 868         .probe          = max77843_muic_probe,
 869         .remove         = max77843_muic_remove,
 870         .id_table       = max77843_muic_id,
 871 };
 872
 873 static int __init max77843_muic_init(void)
 874 {
 875         return platform_driver_register(&max77843_muic_driver);
 876 }
 877 subsys_initcall(max77843_muic_init);
 878
 879 MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
 880 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 881 MODULE_LICENSE("GPL");