kernel/drivers/extcon/extcon-max77843.c

   1 /*
   2  * extcon-max77843.c - Maxim MAX77843 extcon driver to support
   3  *                      MUIC(Micro USB Interface Controller)
   4  *
   5  * Copyright (C) 2015 Samsung Electronics
   6  * Author: Jaewon Kim <jaewon02.kim@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/extcon.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mfd/max77843-private.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/workqueue.h>
  22
  23 #define DELAY_MS_DEFAULT                15000   /* unit: millisecond */
  24
  25 enum max77843_muic_status {
  26         MAX77843_MUIC_STATUS1 = 0,
  27         MAX77843_MUIC_STATUS2,
  28         MAX77843_MUIC_STATUS3,
  29
  30         MAX77843_MUIC_STATUS_NUM,
  31 };
  32
  33 struct max77843_muic_info {
  34         struct device *dev;
  35         struct max77843 *max77843;
  36         struct extcon_dev *edev;
  37
  38         struct mutex mutex;
  39         struct work_struct irq_work;
  40         struct delayed_work wq_detcable;
  41
  42         u8 status[MAX77843_MUIC_STATUS_NUM];
  43         int prev_cable_type;
  44         int prev_chg_type;
  45         int prev_gnd_type;
  46
  47         bool irq_adc;
  48         bool irq_chg;
  49 };
  50
  51 enum max77843_muic_cable_group {
  52         MAX77843_CABLE_GROUP_ADC = 0,
  53         MAX77843_CABLE_GROUP_ADC_GND,
  54         MAX77843_CABLE_GROUP_CHG,
  55 };
  56
  57 enum max77843_muic_adc_debounce_time {
  58         MAX77843_DEBOUNCE_TIME_5MS = 0,
  59         MAX77843_DEBOUNCE_TIME_10MS,
  60         MAX77843_DEBOUNCE_TIME_25MS,
  61         MAX77843_DEBOUNCE_TIME_38_62MS,
  62 };
  63
  64 /* Define accessory cable type */
  65 enum max77843_muic_accessory_type {
  66         MAX77843_MUIC_ADC_GROUND = 0,
  67         MAX77843_MUIC_ADC_SEND_END_BUTTON,
  68         MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
  69         MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
  70         MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
  71         MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
  72         MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
  73         MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
  74         MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
  75         MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
  76         MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
  77         MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
  78         MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
  79         MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
  80         MAX77843_MUIC_ADC_RESERVED_ACC_1,
  81         MAX77843_MUIC_ADC_RESERVED_ACC_2,
  82         MAX77843_MUIC_ADC_RESERVED_ACC_3,
  83         MAX77843_MUIC_ADC_RESERVED_ACC_4,
  84         MAX77843_MUIC_ADC_RESERVED_ACC_5,
  85         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
  86         MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
  87         MAX77843_MUIC_ADC_TTY_CONVERTER,
  88         MAX77843_MUIC_ADC_UART_CABLE,
  89         MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
  90         MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
  91         MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
  92         MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
  93         MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
  94         MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
  95         MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
  96         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
  97         MAX77843_MUIC_ADC_OPEN,
  98
  99         /* The blow accessories should check
 100            not only ADC value but also ADC1K and VBVolt value. */
 101                                                 /* Offset|ADC1K|VBVolt| */
 102         MAX77843_MUIC_GND_USB_HOST = 0x100,     /*    0x1|    0|     0| */
 103         MAX77843_MUIC_GND_USB_HOST_VB = 0x101,  /*    0x1|    0|     1| */
 104         MAX77843_MUIC_GND_MHL = 0x102,          /*    0x1|    1|     0| */
 105         MAX77843_MUIC_GND_MHL_VB = 0x103,       /*    0x1|    1|     1| */
 106 };
 107
 108 /* Define charger cable type */
 109 enum max77843_muic_charger_type {
 110         MAX77843_MUIC_CHG_NONE = 0,
 111         MAX77843_MUIC_CHG_USB,
 112         MAX77843_MUIC_CHG_DOWNSTREAM,
 113         MAX77843_MUIC_CHG_DEDICATED,
 114         MAX77843_MUIC_CHG_SPECIAL_500MA,
 115         MAX77843_MUIC_CHG_SPECIAL_1A,
 116         MAX77843_MUIC_CHG_SPECIAL_BIAS,
 117         MAX77843_MUIC_CHG_RESERVED,
 118         MAX77843_MUIC_CHG_GND,
 119 };
 120
 121 enum {
 122         MAX77843_CABLE_USB = 0,
 123         MAX77843_CABLE_USB_HOST,
 124         MAX77843_CABLE_TA,
 125         MAX77843_CABLE_CHARGE_DOWNSTREAM,
 126         MAX77843_CABLE_FAST_CHARGER,
 127         MAX77843_CABLE_SLOW_CHARGER,
 128         MAX77843_CABLE_MHL,
 129         MAX77843_CABLE_MHL_TA,
 130         MAX77843_CABLE_JIG_USB_ON,
 131         MAX77843_CABLE_JIG_USB_OFF,
 132         MAX77843_CABLE_JIG_UART_ON,
 133         MAX77843_CABLE_JIG_UART_OFF,
 134
 135         MAX77843_CABLE_NUM,
 136 };
 137
 138 static const char *max77843_extcon_cable[] = {
 139         [MAX77843_CABLE_USB]                    = "USB",
 140         [MAX77843_CABLE_USB_HOST]               = "USB-HOST",
 141         [MAX77843_CABLE_TA]                     = "TA",
 142         [MAX77843_CABLE_CHARGE_DOWNSTREAM]      = "CHARGER-DOWNSTREAM",
 143         [MAX77843_CABLE_FAST_CHARGER]           = "FAST-CHARGER",
 144         [MAX77843_CABLE_SLOW_CHARGER]           = "SLOW-CHARGER",
 145         [MAX77843_CABLE_MHL]                    = "MHL",
 146         [MAX77843_CABLE_MHL_TA]                 = "MHL-TA",
 147         [MAX77843_CABLE_JIG_USB_ON]             = "JIG-USB-ON",
 148         [MAX77843_CABLE_JIG_USB_OFF]            = "JIG-USB-OFF",
 149         [MAX77843_CABLE_JIG_UART_ON]            = "JIG-UART-ON",
 150         [MAX77843_CABLE_JIG_UART_OFF]           = "JIG-UART-OFF",
 151 };
 152
 153 struct max77843_muic_irq {
 154         unsigned int irq;
 155         const char *name;
 156         unsigned int virq;
 157 };
 158
 159 static struct max77843_muic_irq max77843_muic_irqs[] = {
 160         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 161         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 162         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 163         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 164         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 165         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 166         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 167         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 168         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 169         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 170         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 171         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 172         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 173         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 174         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 175         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 176 };
 177
 178 static const struct regmap_config max77843_muic_regmap_config = {
 179         .reg_bits       = 8,
 180         .val_bits       = 8,
 181         .max_register   = MAX77843_MUIC_REG_END,
 182 };
 183
 184 static const struct regmap_irq max77843_muic_irq[] = {
 185         /* INT1 interrupt */
 186         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 187         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 188         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 189
 190         /* INT2 interrupt */
 191         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 192         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 193         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 194         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 195         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 196
 197         /* INT3 interrupt */
 198         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 199         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 200         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 201         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 202         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 203         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 204         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 205         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 206 };
 207
 208 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 209         .name           = "max77843-muic",
 210         .status_base    = MAX77843_MUIC_REG_INT1,
 211         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 212         .mask_invert    = true,
 213         .num_regs       = 3,
 214         .irqs           = max77843_muic_irq,
 215         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 216 };
 217
 218 static int max77843_muic_set_path(struct max77843_muic_info *info,
 219                 u8 val, bool attached)
 220 {
 221         struct max77843 *max77843 = info->max77843;
 222         int ret = 0;
 223         unsigned int ctrl1, ctrl2;
 224
 225         if (attached)
 226                 ctrl1 = val;
 227         else
 228                 ctrl1 = CONTROL1_SW_OPEN;
 229
 230         ret = regmap_update_bits(max77843->regmap_muic,
 231                         MAX77843_MUIC_REG_CONTROL1,
 232                         CONTROL1_COM_SW, ctrl1);
 233         if (ret < 0) {
 234                 dev_err(info->dev, "Cannot switch MUIC port\n");
 235                 return ret;
 236         }
 237
 238         if (attached)
 239                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 240         else
 241                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 242
 243         ret = regmap_update_bits(max77843->regmap_muic,
 244                         MAX77843_MUIC_REG_CONTROL2,
 245                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 246                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 247         if (ret < 0) {
 248                 dev_err(info->dev, "Cannot update lowpower mode\n");
 249                 return ret;
 250         }
 251
 252         dev_dbg(info->dev,
 253                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 254                 ctrl1, ctrl2, attached ? "attached" : "detached");
 255
 256         return 0;
 257 }
 258
 259 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 260                 enum max77843_muic_cable_group group, bool *attached)
 261 {
 262         int adc, chg_type, cable_type, gnd_type;
 263
 264         adc = info->status[MAX77843_MUIC_STATUS1] &
 265                         MAX77843_MUIC_STATUS1_ADC_MASK;
 266         adc >>= STATUS1_ADC_SHIFT;
 267
 268         switch (group) {
 269         case MAX77843_CABLE_GROUP_ADC:
 270                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 271                         *attached = false;
 272                         cable_type = info->prev_cable_type;
 273                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 274                 } else {
 275                         *attached = true;
 276                         cable_type = info->prev_cable_type = adc;
 277                 }
 278                 break;
 279         case MAX77843_CABLE_GROUP_CHG:
 280                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 281                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 282
 283                 /* Check GROUND accessory with charger cable */
 284                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 285                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 286                                 /* The following state when charger cable is
 287                                  * disconnected but the GROUND accessory still
 288                                  * connected */
 289                                 *attached = false;
 290                                 cable_type = info->prev_chg_type;
 291                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 292                         } else {
 293
 294                                 /* The following state when charger cable is
 295                                  * connected on the GROUND accessory */
 296                                 *attached = true;
 297                                 cable_type = MAX77843_MUIC_CHG_GND;
 298                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 299                         }
 300                         break;
 301                 }
 302
 303                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 304                         *attached = false;
 305                         cable_type = info->prev_chg_type;
 306                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 307                 } else {
 308                         *attached = true;
 309                         cable_type = info->prev_chg_type = chg_type;
 310                 }
 311                 break;
 312         case MAX77843_CABLE_GROUP_ADC_GND:
 313                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 314                         *attached = false;
 315                         cable_type = info->prev_gnd_type;
 316                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 317                 } else {
 318                         *attached = true;
 319
 320                         /* Offset|ADC1K|VBVolt|
 321                          *    0x1|    0|     0| USB-HOST
 322                          *    0x1|    0|     1| USB-HOST with VB
 323                          *    0x1|    1|     0| MHL
 324                          *    0x1|    1|     1| MHL with VB */
 325                         /* Get ADC1K register bit */
 326                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 327                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 328
 329                         /* Get VBVolt register bit */
 330                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 331                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 332                         gnd_type >>= STATUS2_VBVOLT_SHIFT;
 333
 334                         /* Offset of GND cable */
 335                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 336                         cable_type = info->prev_gnd_type = gnd_type;
 337                 }
 338                 break;
 339         default:
 340                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 341                 cable_type = -EINVAL;
 342                 break;
 343         }
 344
 345         return cable_type;
 346 }
 347
 348 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 349 {
 350         int ret, gnd_cable_type;
 351         bool attached;
 352
 353         gnd_cable_type = max77843_muic_get_cable_type(info,
 354                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 355         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 356                         attached ? "attached" : "detached", gnd_cable_type);
 357
 358         switch (gnd_cable_type) {
 359         case MAX77843_MUIC_GND_USB_HOST:
 360         case MAX77843_MUIC_GND_USB_HOST_VB:
 361                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 362                 if (ret < 0)
 363                         return ret;
 364
 365                 extcon_set_cable_state(info->edev, "USB-HOST", attached);
 366                 break;
 367         case MAX77843_MUIC_GND_MHL_VB:
 368         case MAX77843_MUIC_GND_MHL:
 369                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 370                 if (ret < 0)
 371                         return ret;
 372
 373                 extcon_set_cable_state(info->edev, "MHL", attached);
 374                 break;
 375         default:
 376                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 377                         attached ? "attached" : "detached", gnd_cable_type);
 378                 return -EINVAL;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 385                 int cable_type, bool attached)
 386 {
 387         int ret;
 388
 389         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 390                         attached ? "attached" : "detached", cable_type);
 391
 392         switch (cable_type) {
 393         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 394                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 395                 if (ret < 0)
 396                         return ret;
 397                 extcon_set_cable_state(info->edev, "JIG-USB-OFF", attached);
 398                 break;
 399         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 400                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 401                 if (ret < 0)
 402                         return ret;
 403                 extcon_set_cable_state(info->edev, "JIG-USB-ON", attached);
 404                 break;
 405         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 406                 ret = max77843_muic_set_path(info, CONTROL1_SW_UART, attached);
 407                 if (ret < 0)
 408                         return ret;
 409                 extcon_set_cable_state(info->edev, "JIG-UART-OFF", attached);
 410                 break;
 411         default:
 412                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 413                 if (ret < 0)
 414                         return ret;
 415                 break;
 416         }
 417
 418         return 0;
 419 }
 420
 421 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 422 {
 423         int ret, cable_type;
 424         bool attached;
 425
 426         cable_type = max77843_muic_get_cable_type(info,
 427                         MAX77843_CABLE_GROUP_ADC, &attached);
 428
 429         dev_dbg(info->dev,
 430                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 431                 attached ? "attached" : "detached", cable_type,
 432                 info->prev_cable_type);
 433
 434         switch (cable_type) {
 435         case MAX77843_MUIC_ADC_GROUND:
 436                 ret = max77843_muic_adc_gnd_handler(info);
 437                 if (ret < 0)
 438                         return ret;
 439                 break;
 440         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 441         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 442         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 443                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 444                 if (ret < 0)
 445                         return ret;
 446                 break;
 447         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 448         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 449         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 450         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 451         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 452         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 453         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 454         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 455         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 456         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 457         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 458         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 459         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 460         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 461         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 462         case MAX77843_MUIC_ADC_RESERVED_ACC_3:
 463         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 464         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 465         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 466         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 467         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 468         case MAX77843_MUIC_ADC_UART_CABLE:
 469         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 470         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 471         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 472         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 473         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 474         case MAX77843_MUIC_ADC_OPEN:
 475                 dev_err(info->dev,
 476                         "accessory is %s but it isn't used (adc:0x%x)\n",
 477                         attached ? "attached" : "detached", cable_type);
 478                 return -EAGAIN;
 479         default:
 480                 dev_err(info->dev,
 481                         "failed to detect %s accessory (adc:0x%x)\n",
 482                         attached ? "attached" : "detached", cable_type);
 483                 return -EINVAL;
 484         }
 485
 486         return 0;
 487 }
 488
 489 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 490 {
 491         int ret, chg_type, gnd_type;
 492         bool attached;
 493
 494         chg_type = max77843_muic_get_cable_type(info,
 495                         MAX77843_CABLE_GROUP_CHG, &attached);
 496
 497         dev_dbg(info->dev,
 498                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 499                 attached ? "attached" : "detached",
 500                 chg_type, info->prev_chg_type);
 501
 502         switch (chg_type) {
 503         case MAX77843_MUIC_CHG_USB:
 504                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 505                 if (ret < 0)
 506                         return ret;
 507
 508                 extcon_set_cable_state(info->edev, "USB", attached);
 509                 break;
 510         case MAX77843_MUIC_CHG_DOWNSTREAM:
 511                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 512                 if (ret < 0)
 513                         return ret;
 514
 515                 extcon_set_cable_state(info->edev,
 516                                 "CHARGER-DOWNSTREAM", attached);
 517                 break;
 518         case MAX77843_MUIC_CHG_DEDICATED:
 519                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 520                 if (ret < 0)
 521                         return ret;
 522
 523                 extcon_set_cable_state(info->edev, "TA", attached);
 524                 break;
 525         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 526                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 527                 if (ret < 0)
 528                         return ret;
 529
 530                 extcon_set_cable_state(info->edev, "SLOW-CHAREGER", attached);
 531                 break;
 532         case MAX77843_MUIC_CHG_SPECIAL_1A:
 533                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 534                 if (ret < 0)
 535                         return ret;
 536
 537                 extcon_set_cable_state(info->edev, "FAST-CHARGER", attached);
 538                 break;
 539         case MAX77843_MUIC_CHG_GND:
 540                 gnd_type = max77843_muic_get_cable_type(info,
 541                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 542
 543                 /* Charger cable on MHL accessory is attach or detach */
 544                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 545                         extcon_set_cable_state(info->edev, "MHL-TA", true);
 546                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 547                         extcon_set_cable_state(info->edev, "MHL-TA", false);
 548                 break;
 549         case MAX77843_MUIC_CHG_NONE:
 550                 break;
 551         default:
 552                 dev_err(info->dev,
 553                         "failed to detect %s accessory (chg_type:0x%x)\n",
 554                         attached ? "attached" : "detached", chg_type);
 555
 556                 max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 557                 return -EINVAL;
 558         }
 559
 560         return 0;
 561 }
 562
 563 static void max77843_muic_irq_work(struct work_struct *work)
 564 {
 565         struct max77843_muic_info *info = container_of(work,
 566                         struct max77843_muic_info, irq_work);
 567         struct max77843 *max77843 = info->max77843;
 568         int ret = 0;
 569
 570         mutex_lock(&info->mutex);
 571
 572         ret = regmap_bulk_read(max77843->regmap_muic,
 573                         MAX77843_MUIC_REG_STATUS1, info->status,
 574                         MAX77843_MUIC_STATUS_NUM);
 575         if (ret) {
 576                 dev_err(info->dev, "Cannot read STATUS registers\n");
 577                 mutex_unlock(&info->mutex);
 578                 return;
 579         }
 580
 581         if (info->irq_adc) {
 582                 ret = max77843_muic_adc_handler(info);
 583                 if (ret)
 584                         dev_err(info->dev, "Unknown cable type\n");
 585                 info->irq_adc = false;
 586         }
 587
 588         if (info->irq_chg) {
 589                 ret = max77843_muic_chg_handler(info);
 590                 if (ret)
 591                         dev_err(info->dev, "Unknown charger type\n");
 592                 info->irq_chg = false;
 593         }
 594
 595         mutex_unlock(&info->mutex);
 596 }
 597
 598 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 599 {
 600         struct max77843_muic_info *info = data;
 601         int i, irq_type = -1;
 602
 603         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 604                 if (irq == max77843_muic_irqs[i].virq)
 605                         irq_type = max77843_muic_irqs[i].irq;
 606
 607         switch (irq_type) {
 608         case MAX77843_MUIC_IRQ_INT1_ADC:
 609         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 610         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 611                 info->irq_adc = true;
 612                 break;
 613         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 614         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 615         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 616         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 617         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 618                 info->irq_chg = true;
 619                 break;
 620         case MAX77843_MUIC_IRQ_INT3_VBADC:
 621         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 622         case MAX77843_MUIC_IRQ_INT3_DNRES:
 623         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 624         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 625         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 626         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 627         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 628                 break;
 629         default:
 630                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 631                 break;
 632         }
 633
 634         schedule_work(&info->irq_work);
 635
 636         return IRQ_HANDLED;
 637 }
 638
 639 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 640 {
 641         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 642                         struct max77843_muic_info, wq_detcable);
 643         struct max77843 *max77843 = info->max77843;
 644         int chg_type, adc, ret;
 645         bool attached;
 646
 647         mutex_lock(&info->mutex);
 648
 649         ret = regmap_bulk_read(max77843->regmap_muic,
 650                         MAX77843_MUIC_REG_STATUS1, info->status,
 651                         MAX77843_MUIC_STATUS_NUM);
 652         if (ret) {
 653                 dev_err(info->dev, "Cannot read STATUS registers\n");
 654                 goto err_cable_wq;
 655         }
 656
 657         adc = max77843_muic_get_cable_type(info,
 658                         MAX77843_CABLE_GROUP_ADC, &attached);
 659         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 660                 ret = max77843_muic_adc_handler(info);
 661                 if (ret < 0) {
 662                         dev_err(info->dev, "Cannot detect accessory\n");
 663                         goto err_cable_wq;
 664                 }
 665         }
 666
 667         chg_type = max77843_muic_get_cable_type(info,
 668                         MAX77843_CABLE_GROUP_CHG, &attached);
 669         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 670                 ret = max77843_muic_chg_handler(info);
 671                 if (ret < 0) {
 672                         dev_err(info->dev, "Cannot detect charger accessory\n");
 673                         goto err_cable_wq;
 674                 }
 675         }
 676
 677 err_cable_wq:
 678         mutex_unlock(&info->mutex);
 679 }
 680
 681 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 682                 enum max77843_muic_adc_debounce_time time)
 683 {
 684         struct max77843 *max77843 = info->max77843;
 685         int ret;
 686
 687         switch (time) {
 688         case MAX77843_DEBOUNCE_TIME_5MS:
 689         case MAX77843_DEBOUNCE_TIME_10MS:
 690         case MAX77843_DEBOUNCE_TIME_25MS:
 691         case MAX77843_DEBOUNCE_TIME_38_62MS:
 692                 ret = regmap_update_bits(max77843->regmap_muic,
 693                                 MAX77843_MUIC_REG_CONTROL4,
 694                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 695                                 time << CONTROL4_ADCDBSET_SHIFT);
 696                 if (ret < 0) {
 697                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 698                         return ret;
 699                 }
 700                 break;
 701         default:
 702                 dev_err(info->dev, "Invalid ADC debounce time\n");
 703                 return -EINVAL;
 704         }
 705
 706         return 0;
 707 }
 708
 709 static int max77843_init_muic_regmap(struct max77843 *max77843)
 710 {
 711         int ret;
 712
 713         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 714                         I2C_ADDR_MUIC);
 715         if (!max77843->i2c_muic) {
 716                 dev_err(&max77843->i2c->dev,
 717                                 "Cannot allocate I2C device for MUIC\n");
 718                 return -ENOMEM;
 719         }
 720
 721         i2c_set_clientdata(max77843->i2c_muic, max77843);
 722
 723         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 724                         &max77843_muic_regmap_config);
 725         if (IS_ERR(max77843->regmap_muic)) {
 726                 ret = PTR_ERR(max77843->regmap_muic);
 727                 goto err_muic_i2c;
 728         }
 729
 730         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 731                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 732                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 733         if (ret < 0) {
 734                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 735                 goto err_muic_i2c;
 736         }
 737
 738         return 0;
 739
 740 err_muic_i2c:
 741         i2c_unregister_device(max77843->i2c_muic);
 742
 743         return ret;
 744 }
 745
 746 static int max77843_muic_probe(struct platform_device *pdev)
 747 {
 748         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 749         struct max77843_muic_info *info;
 750         unsigned int id;
 751         int i, ret;
 752
 753         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 754         if (!info)
 755                 return -ENOMEM;
 756
 757         info->dev = &pdev->dev;
 758         info->max77843 = max77843;
 759
 760         platform_set_drvdata(pdev, info);
 761         mutex_init(&info->mutex);
 762
 763         /* Initialize i2c and regmap */
 764         ret = max77843_init_muic_regmap(max77843);
 765         if (ret) {
 766                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 767                 return ret;
 768         }
 769
 770         /* Turn off auto detection configuration */
 771         ret = regmap_update_bits(max77843->regmap_muic,
 772                         MAX77843_MUIC_REG_CONTROL4,
 773                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 774                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 775                         CONTROL4_AUTO_DISABLE);
 776
 777         /* Initialize extcon device */
 778         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 779                         max77843_extcon_cable);
 780         if (IS_ERR(info->edev)) {
 781                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 782                 ret = -ENODEV;
 783                 goto err_muic_irq;
 784         }
 785
 786         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 787         if (ret) {
 788                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 789                 goto err_muic_irq;
 790         }
 791
 792         /* Set ADC debounce time */
 793         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 794
 795         /* Set initial path for UART */
 796         max77843_muic_set_path(info, CONTROL1_SW_UART, true);
 797
 798         /* Check revision number of MUIC device */
 799         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 800         if (ret < 0) {
 801                 dev_err(&pdev->dev, "Failed to read revision number\n");
 802                 goto err_muic_irq;
 803         }
 804         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 805
 806         /* Support virtual irq domain for max77843 MUIC device */
 807         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 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 max77843 *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");