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 <[email protected]>
   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         /*
 101          * The below accessories should check
 102          * not only ADC value but also ADC1K and VBVolt value.
 103          */
 104                                                 /* Offset|ADC1K|VBVolt| */
 105         MAX77843_MUIC_GND_USB_HOST = 0x100,     /*    0x1|    0|     0| */
 106         MAX77843_MUIC_GND_USB_HOST_VB = 0x101,  /*    0x1|    0|     1| */
 107         MAX77843_MUIC_GND_MHL = 0x102,          /*    0x1|    1|     0| */
 108         MAX77843_MUIC_GND_MHL_VB = 0x103,       /*    0x1|    1|     1| */
 109 };
 110
 111 /* Define charger cable type */
 112 enum max77843_muic_charger_type {
 113         MAX77843_MUIC_CHG_NONE = 0,
 114         MAX77843_MUIC_CHG_USB,
 115         MAX77843_MUIC_CHG_DOWNSTREAM,
 116         MAX77843_MUIC_CHG_DEDICATED,
 117         MAX77843_MUIC_CHG_SPECIAL_500MA,
 118         MAX77843_MUIC_CHG_SPECIAL_1A,
 119         MAX77843_MUIC_CHG_SPECIAL_BIAS,
 120         MAX77843_MUIC_CHG_RESERVED,
 121         MAX77843_MUIC_CHG_GND,
 122 };
 123
 124 static const unsigned int max77843_extcon_cable[] = {
 125         EXTCON_USB,
 126         EXTCON_USB_HOST,
 127         EXTCON_CHG_USB_SDP,
 128         EXTCON_CHG_USB_DCP,
 129         EXTCON_CHG_USB_CDP,
 130         EXTCON_CHG_USB_FAST,
 131         EXTCON_CHG_USB_SLOW,
 132         EXTCON_DISP_MHL,
 133         EXTCON_JIG,
 134         EXTCON_NONE,
 135 };
 136
 137 struct max77843_muic_irq {
 138         unsigned int irq;
 139         const char *name;
 140         unsigned int virq;
 141 };
 142
 143 static struct max77843_muic_irq max77843_muic_irqs[] = {
 144         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 145         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 146         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 147         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 148         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 149         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 150         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 151         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 152         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 153         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 154         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 155         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 156         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 157         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 158         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 159         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 160 };
 161
 162 static const struct regmap_config max77843_muic_regmap_config = {
 163         .reg_bits       = 8,
 164         .val_bits       = 8,
 165         .max_register   = MAX77843_MUIC_REG_END,
 166 };
 167
 168 static const struct regmap_irq max77843_muic_irq[] = {
 169         /* INT1 interrupt */
 170         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 171         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 172         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 173
 174         /* INT2 interrupt */
 175         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 176         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 177         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 178         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 179         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 180
 181         /* INT3 interrupt */
 182         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 183         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 184         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 185         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 186         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 187         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 188         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 189         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 190 };
 191
 192 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 193         .name           = "max77843-muic",
 194         .status_base    = MAX77843_MUIC_REG_INT1,
 195         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 196         .mask_invert    = true,
 197         .num_regs       = 3,
 198         .irqs           = max77843_muic_irq,
 199         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 200 };
 201
 202 static int max77843_muic_set_path(struct max77843_muic_info *info,
 203                 u8 val, bool attached)
 204 {
 205         struct max77693_dev *max77843 = info->max77843;
 206         int ret = 0;
 207         unsigned int ctrl1, ctrl2;
 208
 209         if (attached)
 210                 ctrl1 = val;
 211         else
 212                 ctrl1 = MAX77843_MUIC_CONTROL1_SW_OPEN;
 213
 214         ret = regmap_update_bits(max77843->regmap_muic,
 215                         MAX77843_MUIC_REG_CONTROL1,
 216                         MAX77843_MUIC_CONTROL1_COM_SW, ctrl1);
 217         if (ret < 0) {
 218                 dev_err(info->dev, "Cannot switch MUIC port\n");
 219                 return ret;
 220         }
 221
 222         if (attached)
 223                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 224         else
 225                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 226
 227         ret = regmap_update_bits(max77843->regmap_muic,
 228                         MAX77843_MUIC_REG_CONTROL2,
 229                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 230                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 231         if (ret < 0) {
 232                 dev_err(info->dev, "Cannot update lowpower mode\n");
 233                 return ret;
 234         }
 235
 236         dev_dbg(info->dev,
 237                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 238                 ctrl1, ctrl2, attached ? "attached" : "detached");
 239
 240         return 0;
 241 }
 242
 243 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 244                 enum max77843_muic_cable_group group, bool *attached)
 245 {
 246         int adc, chg_type, cable_type, gnd_type;
 247
 248         adc = info->status[MAX77843_MUIC_STATUS1] &
 249                         MAX77843_MUIC_STATUS1_ADC_MASK;
 250         adc >>= MAX77843_MUIC_STATUS1_ADC_SHIFT;
 251
 252         switch (group) {
 253         case MAX77843_CABLE_GROUP_ADC:
 254                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 255                         *attached = false;
 256                         cable_type = info->prev_cable_type;
 257                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 258                 } else {
 259                         *attached = true;
 260                         cable_type = info->prev_cable_type = adc;
 261                 }
 262                 break;
 263         case MAX77843_CABLE_GROUP_CHG:
 264                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 265                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 266
 267                 /* Check GROUND accessory with charger cable */
 268                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 269                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 270                                 /*
 271                                  * The following state when charger cable is
 272                                  * disconnected but the GROUND accessory still
 273                                  * connected.
 274                                  */
 275                                 *attached = false;
 276                                 cable_type = info->prev_chg_type;
 277                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 278                         } else {
 279
 280                                 /*
 281                                  * The following state when charger cable is
 282                                  * connected on the GROUND accessory.
 283                                  */
 284                                 *attached = true;
 285                                 cable_type = MAX77843_MUIC_CHG_GND;
 286                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 287                         }
 288                         break;
 289                 }
 290
 291                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 292                         *attached = false;
 293                         cable_type = info->prev_chg_type;
 294                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 295                 } else {
 296                         *attached = true;
 297                         cable_type = info->prev_chg_type = chg_type;
 298                 }
 299                 break;
 300         case MAX77843_CABLE_GROUP_ADC_GND:
 301                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 302                         *attached = false;
 303                         cable_type = info->prev_gnd_type;
 304                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 305                 } else {
 306                         *attached = true;
 307
 308                         /*
 309                          * Offset|ADC1K|VBVolt|
 310                          *    0x1|    0|     0| USB-HOST
 311                          *    0x1|    0|     1| USB-HOST with VB
 312                          *    0x1|    1|     0| MHL
 313                          *    0x1|    1|     1| MHL with VB
 314                          */
 315                         /* Get ADC1K register bit */
 316                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 317                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 318
 319                         /* Get VBVolt register bit */
 320                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 321                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 322                         gnd_type >>= MAX77843_MUIC_STATUS2_VBVOLT_SHIFT;
 323
 324                         /* Offset of GND cable */
 325                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 326                         cable_type = info->prev_gnd_type = gnd_type;
 327                 }
 328                 break;
 329         default:
 330                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 331                 cable_type = -EINVAL;
 332                 break;
 333         }
 334
 335         return cable_type;
 336 }
 337
 338 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 339 {
 340         int ret, gnd_cable_type;
 341         bool attached;
 342
 343         gnd_cable_type = max77843_muic_get_cable_type(info,
 344                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 345         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 346                         attached ? "attached" : "detached", gnd_cable_type);
 347
 348         switch (gnd_cable_type) {
 349         case MAX77843_MUIC_GND_USB_HOST:
 350         case MAX77843_MUIC_GND_USB_HOST_VB:
 351                 ret = max77843_muic_set_path(info,
 352                                              MAX77843_MUIC_CONTROL1_SW_USB,
 353                                              attached);
 354                 if (ret < 0)
 355                         return ret;
 356
 357                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
 358                 break;
 359         case MAX77843_MUIC_GND_MHL_VB:
 360         case MAX77843_MUIC_GND_MHL:
 361                 ret = max77843_muic_set_path(info,
 362                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 363                                              attached);
 364                 if (ret < 0)
 365                         return ret;
 366
 367                 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
 368                 break;
 369         default:
 370                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 371                         attached ? "attached" : "detached", gnd_cable_type);
 372                 return -EINVAL;
 373         }
 374
 375         return 0;
 376 }
 377
 378 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 379                 int cable_type, bool attached)
 380 {
 381         int ret;
 382         u8 path = MAX77843_MUIC_CONTROL1_SW_OPEN;
 383
 384         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 385                         attached ? "attached" : "detached", cable_type);
 386
 387         switch (cable_type) {
 388         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 389         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 390                 path = MAX77843_MUIC_CONTROL1_SW_USB;
 391                 break;
 392         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 393                 path = MAX77843_MUIC_CONTROL1_SW_UART;
 394                 break;
 395         default:
 396                 return -EINVAL;
 397         }
 398
 399         ret = max77843_muic_set_path(info, path, attached);
 400         if (ret < 0)
 401                 return ret;
 402
 403         extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
 404
 405         return 0;
 406 }
 407
 408 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 409 {
 410         int ret, cable_type;
 411         bool attached;
 412
 413         cable_type = max77843_muic_get_cable_type(info,
 414                         MAX77843_CABLE_GROUP_ADC, &attached);
 415
 416         dev_dbg(info->dev,
 417                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 418                 attached ? "attached" : "detached", cable_type,
 419                 info->prev_cable_type);
 420
 421         switch (cable_type) {
 422         case MAX77843_MUIC_ADC_GROUND:
 423                 ret = max77843_muic_adc_gnd_handler(info);
 424                 if (ret < 0)
 425                         return ret;
 426                 break;
 427         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 428         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 429         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 430                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 431                 if (ret < 0)
 432                         return ret;
 433                 break;
 434         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 435         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 436         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 437         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 438         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 439         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 440         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 441         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 442         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 443         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 444         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 445         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 446         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 447         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 448         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 449         case MAX77843_MUIC_ADC_RESERVED_ACC_3:
 450         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 451         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 452         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 453         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 454         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 455         case MAX77843_MUIC_ADC_UART_CABLE:
 456         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 457         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 458         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 459         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 460         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 461         case MAX77843_MUIC_ADC_OPEN:
 462                 dev_err(info->dev,
 463                         "accessory is %s but it isn't used (adc:0x%x)\n",
 464                         attached ? "attached" : "detached", cable_type);
 465                 return -EAGAIN;
 466         default:
 467                 dev_err(info->dev,
 468                         "failed to detect %s accessory (adc:0x%x)\n",
 469                         attached ? "attached" : "detached", cable_type);
 470                 return -EINVAL;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 477 {
 478         int ret, chg_type, gnd_type;
 479         bool attached;
 480
 481         chg_type = max77843_muic_get_cable_type(info,
 482                         MAX77843_CABLE_GROUP_CHG, &attached);
 483
 484         dev_dbg(info->dev,
 485                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 486                 attached ? "attached" : "detached",
 487                 chg_type, info->prev_chg_type);
 488
 489         switch (chg_type) {
 490         case MAX77843_MUIC_CHG_USB:
 491                 ret = max77843_muic_set_path(info,
 492                                              MAX77843_MUIC_CONTROL1_SW_USB,
 493                                              attached);
 494                 if (ret < 0)
 495                         return ret;
 496
 497                 extcon_set_state_sync(info->edev, EXTCON_USB, attached);
 498                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 499                                         attached);
 500                 break;
 501         case MAX77843_MUIC_CHG_DOWNSTREAM:
 502                 ret = max77843_muic_set_path(info,
 503                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 504                                              attached);
 505                 if (ret < 0)
 506                         return ret;
 507
 508                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
 509                                         attached);
 510                 break;
 511         case MAX77843_MUIC_CHG_DEDICATED:
 512                 ret = max77843_muic_set_path(info,
 513                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 514                                              attached);
 515                 if (ret < 0)
 516                         return ret;
 517
 518                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 519                                         attached);
 520                 break;
 521         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 522                 ret = max77843_muic_set_path(info,
 523                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 524                                              attached);
 525                 if (ret < 0)
 526                         return ret;
 527
 528                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
 529                                         attached);
 530                 break;
 531         case MAX77843_MUIC_CHG_SPECIAL_1A:
 532                 ret = max77843_muic_set_path(info,
 533                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
 534                                              attached);
 535                 if (ret < 0)
 536                         return ret;
 537
 538                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
 539                                         attached);
 540                 break;
 541         case MAX77843_MUIC_CHG_GND:
 542                 gnd_type = max77843_muic_get_cable_type(info,
 543                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 544
 545                 /* Charger cable on MHL accessory is attach or detach */
 546                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 547                         extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 548                                                 true);
 549                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 550                         extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
 551                                                 false);
 552                 break;
 553         case MAX77843_MUIC_CHG_NONE:
 554                 break;
 555         default:
 556                 dev_err(info->dev,
 557                         "failed to detect %s accessory (chg_type:0x%x)\n",
 558                         attached ? "attached" : "detached", chg_type);
 559
 560                 max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_OPEN,
 561                                        attached);
 562                 return -EINVAL;
 563         }
 564
 565         return 0;
 566 }
 567
 568 static void max77843_muic_irq_work(struct work_struct *work)
 569 {
 570         struct max77843_muic_info *info = container_of(work,
 571                         struct max77843_muic_info, irq_work);
 572         struct max77693_dev *max77843 = info->max77843;
 573         int ret = 0;
 574
 575         mutex_lock(&info->mutex);
 576
 577         ret = regmap_bulk_read(max77843->regmap_muic,
 578                         MAX77843_MUIC_REG_STATUS1, info->status,
 579                         MAX77843_MUIC_STATUS_NUM);
 580         if (ret) {
 581                 dev_err(info->dev, "Cannot read STATUS registers\n");
 582                 mutex_unlock(&info->mutex);
 583                 return;
 584         }
 585
 586         if (info->irq_adc) {
 587                 ret = max77843_muic_adc_handler(info);
 588                 if (ret)
 589                         dev_err(info->dev, "Unknown cable type\n");
 590                 info->irq_adc = false;
 591         }
 592
 593         if (info->irq_chg) {
 594                 ret = max77843_muic_chg_handler(info);
 595                 if (ret)
 596                         dev_err(info->dev, "Unknown charger type\n");
 597                 info->irq_chg = false;
 598         }
 599
 600         mutex_unlock(&info->mutex);
 601 }
 602
 603 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 604 {
 605         struct max77843_muic_info *info = data;
 606         int i, irq_type = -1;
 607
 608         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 609                 if (irq == max77843_muic_irqs[i].virq)
 610                         irq_type = max77843_muic_irqs[i].irq;
 611
 612         switch (irq_type) {
 613         case MAX77843_MUIC_IRQ_INT1_ADC:
 614         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 615         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 616                 info->irq_adc = true;
 617                 break;
 618         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 619         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 620         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 621         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 622         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 623                 info->irq_chg = true;
 624                 break;
 625         case MAX77843_MUIC_IRQ_INT3_VBADC:
 626         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 627         case MAX77843_MUIC_IRQ_INT3_DNRES:
 628         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 629         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 630         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 631         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 632         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 633                 break;
 634         default:
 635                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 636                 break;
 637         }
 638
 639         schedule_work(&info->irq_work);
 640
 641         return IRQ_HANDLED;
 642 }
 643
 644 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 645 {
 646         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 647                         struct max77843_muic_info, wq_detcable);
 648         struct max77693_dev *max77843 = info->max77843;
 649         int chg_type, adc, ret;
 650         bool attached;
 651
 652         mutex_lock(&info->mutex);
 653
 654         ret = regmap_bulk_read(max77843->regmap_muic,
 655                         MAX77843_MUIC_REG_STATUS1, info->status,
 656                         MAX77843_MUIC_STATUS_NUM);
 657         if (ret) {
 658                 dev_err(info->dev, "Cannot read STATUS registers\n");
 659                 goto err_cable_wq;
 660         }
 661
 662         adc = max77843_muic_get_cable_type(info,
 663                         MAX77843_CABLE_GROUP_ADC, &attached);
 664         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 665                 ret = max77843_muic_adc_handler(info);
 666                 if (ret < 0) {
 667                         dev_err(info->dev, "Cannot detect accessory\n");
 668                         goto err_cable_wq;
 669                 }
 670         }
 671
 672         chg_type = max77843_muic_get_cable_type(info,
 673                         MAX77843_CABLE_GROUP_CHG, &attached);
 674         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 675                 ret = max77843_muic_chg_handler(info);
 676                 if (ret < 0) {
 677                         dev_err(info->dev, "Cannot detect charger accessory\n");
 678                         goto err_cable_wq;
 679                 }
 680         }
 681
 682 err_cable_wq:
 683         mutex_unlock(&info->mutex);
 684 }
 685
 686 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 687                 enum max77843_muic_adc_debounce_time time)
 688 {
 689         struct max77693_dev *max77843 = info->max77843;
 690         int ret;
 691
 692         switch (time) {
 693         case MAX77843_DEBOUNCE_TIME_5MS:
 694         case MAX77843_DEBOUNCE_TIME_10MS:
 695         case MAX77843_DEBOUNCE_TIME_25MS:
 696         case MAX77843_DEBOUNCE_TIME_38_62MS:
 697                 ret = regmap_update_bits(max77843->regmap_muic,
 698                                 MAX77843_MUIC_REG_CONTROL4,
 699                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 700                                 time << MAX77843_MUIC_CONTROL4_ADCDBSET_SHIFT);
 701                 if (ret < 0) {
 702                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 703                         return ret;
 704                 }
 705                 break;
 706         default:
 707                 dev_err(info->dev, "Invalid ADC debounce time\n");
 708                 return -EINVAL;
 709         }
 710
 711         return 0;
 712 }
 713
 714 static int max77843_init_muic_regmap(struct max77693_dev *max77843)
 715 {
 716         int ret;
 717
 718         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 719                         I2C_ADDR_MUIC);
 720         if (!max77843->i2c_muic) {
 721                 dev_err(&max77843->i2c->dev,
 722                                 "Cannot allocate I2C device for MUIC\n");
 723                 return -ENOMEM;
 724         }
 725
 726         i2c_set_clientdata(max77843->i2c_muic, max77843);
 727
 728         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 729                         &max77843_muic_regmap_config);
 730         if (IS_ERR(max77843->regmap_muic)) {
 731                 ret = PTR_ERR(max77843->regmap_muic);
 732                 goto err_muic_i2c;
 733         }
 734
 735         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 736                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 737                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 738         if (ret < 0) {
 739                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 740                 goto err_muic_i2c;
 741         }
 742
 743         return 0;
 744
 745 err_muic_i2c:
 746         i2c_unregister_device(max77843->i2c_muic);
 747
 748         return ret;
 749 }
 750
 751 static int max77843_muic_probe(struct platform_device *pdev)
 752 {
 753         struct max77693_dev *max77843 = dev_get_drvdata(pdev->dev.parent);
 754         struct max77843_muic_info *info;
 755         unsigned int id;
 756         int i, ret;
 757
 758         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 759         if (!info)
 760                 return -ENOMEM;
 761
 762         info->dev = &pdev->dev;
 763         info->max77843 = max77843;
 764
 765         platform_set_drvdata(pdev, info);
 766         mutex_init(&info->mutex);
 767
 768         /* Initialize i2c and regmap */
 769         ret = max77843_init_muic_regmap(max77843);
 770         if (ret) {
 771                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 772                 return ret;
 773         }
 774
 775         /* Turn off auto detection configuration */
 776         ret = regmap_update_bits(max77843->regmap_muic,
 777                         MAX77843_MUIC_REG_CONTROL4,
 778                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 779                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 780                         CONTROL4_AUTO_DISABLE);
 781
 782         /* Initialize extcon device */
 783         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 784                         max77843_extcon_cable);
 785         if (IS_ERR(info->edev)) {
 786                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 787                 ret = -ENODEV;
 788                 goto err_muic_irq;
 789         }
 790
 791         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 792         if (ret) {
 793                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 794                 goto err_muic_irq;
 795         }
 796
 797         /* Set ADC debounce time */
 798         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 799
 800         /* Set initial path for UART */
 801         max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_UART, true);
 802
 803         /* Check revision number of MUIC device */
 804         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 805         if (ret < 0) {
 806                 dev_err(&pdev->dev, "Failed to read revision number\n");
 807                 goto err_muic_irq;
 808         }
 809         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 810
 811         /* Support virtual irq domain for max77843 MUIC device */
 812         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 813
 814         /* Clear IRQ bits before request IRQs */
 815         ret = regmap_bulk_read(max77843->regmap_muic,
 816                         MAX77843_MUIC_REG_INT1, info->status,
 817                         MAX77843_MUIC_STATUS_NUM);
 818         if (ret) {
 819                 dev_err(&pdev->dev, "Failed to Clear IRQ bits\n");
 820                 goto err_muic_irq;
 821         }
 822
 823         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 824                 struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
 825                 int virq = 0;
 826
 827                 virq = regmap_irq_get_virq(max77843->irq_data_muic,
 828                                 muic_irq->irq);
 829                 if (virq <= 0) {
 830                         ret = -EINVAL;
 831                         goto err_muic_irq;
 832                 }
 833                 muic_irq->virq = virq;
 834
 835                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 836                                 max77843_muic_irq_handler, IRQF_NO_SUSPEND,
 837                                 muic_irq->name, info);
 838                 if (ret) {
 839                         dev_err(&pdev->dev,
 840                                 "Failed to request irq (IRQ: %d, error: %d)\n",
 841                                 muic_irq->irq, ret);
 842                         goto err_muic_irq;
 843                 }
 844         }
 845
 846         /* Detect accessory after completing the initialization of platform */
 847         INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
 848         queue_delayed_work(system_power_efficient_wq,
 849                         &info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
 850
 851         return 0;
 852
 853 err_muic_irq:
 854         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 855         i2c_unregister_device(max77843->i2c_muic);
 856
 857         return ret;
 858 }
 859
 860 static int max77843_muic_remove(struct platform_device *pdev)
 861 {
 862         struct max77843_muic_info *info = platform_get_drvdata(pdev);
 863         struct max77693_dev *max77843 = info->max77843;
 864
 865         cancel_work_sync(&info->irq_work);
 866         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 867         i2c_unregister_device(max77843->i2c_muic);
 868
 869         return 0;
 870 }
 871
 872 static const struct platform_device_id max77843_muic_id[] = {
 873         { "max77843-muic", },
 874         { /* sentinel */ },
 875 };
 876 MODULE_DEVICE_TABLE(platform, max77843_muic_id);
 877
 878 static struct platform_driver max77843_muic_driver = {
 879         .driver         = {
 880                 .name           = "max77843-muic",
 881         },
 882         .probe          = max77843_muic_probe,
 883         .remove         = max77843_muic_remove,
 884         .id_table       = max77843_muic_id,
 885 };
 886
 887 static int __init max77843_muic_init(void)
 888 {
 889         return platform_driver_register(&max77843_muic_driver);
 890 }
 891 subsys_initcall(max77843_muic_init);
 892
 893 MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
 894 MODULE_AUTHOR("Jaewon Kim <[email protected]>");
 895 MODULE_LICENSE("GPL");