drivers/extcon/extcon-max14577.c

   1 /*
   2  * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
   3  *
   4  * Copyright (C) 2013,2014 Samsung Electronics
   5  * Chanwoo Choi <cw00.choi@samsung.com>
   6  * Krzysztof Kozlowski <k.kozlowski@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  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/i2c.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/mfd/max14577.h>
  25 #include <linux/mfd/max14577-private.h>
  26 #include <linux/extcon.h>
  27
  28 #define DELAY_MS_DEFAULT                17000           /* unit: millisecond */
  29
  30 enum max14577_muic_adc_debounce_time {
  31         ADC_DEBOUNCE_TIME_5MS = 0,
  32         ADC_DEBOUNCE_TIME_10MS,
  33         ADC_DEBOUNCE_TIME_25MS,
  34         ADC_DEBOUNCE_TIME_38_62MS,
  35 };
  36
  37 enum max14577_muic_status {
  38         MAX14577_MUIC_STATUS1 = 0,
  39         MAX14577_MUIC_STATUS2 = 1,
  40         MAX14577_MUIC_STATUS_END,
  41 };
  42
  43 /**
  44  * struct max14577_muic_irq
  45  * @irq: the index of irq list of MUIC device.
  46  * @name: the name of irq.
  47  * @virq: the virtual irq to use irq domain
  48  */
  49 struct max14577_muic_irq {
  50         unsigned int irq;
  51         const char *name;
  52         unsigned int virq;
  53 };
  54
  55 static struct max14577_muic_irq max14577_muic_irqs[] = {
  56         { MAX14577_IRQ_INT1_ADC,        "muic-ADC" },
  57         { MAX14577_IRQ_INT1_ADCLOW,     "muic-ADCLOW" },
  58         { MAX14577_IRQ_INT1_ADCERR,     "muic-ADCError" },
  59         { MAX14577_IRQ_INT2_CHGTYP,     "muic-CHGTYP" },
  60         { MAX14577_IRQ_INT2_CHGDETRUN,  "muic-CHGDETRUN" },
  61         { MAX14577_IRQ_INT2_DCDTMR,     "muic-DCDTMR" },
  62         { MAX14577_IRQ_INT2_DBCHG,      "muic-DBCHG" },
  63         { MAX14577_IRQ_INT2_VBVOLT,     "muic-VBVOLT" },
  64 };
  65
  66 static struct max14577_muic_irq max77836_muic_irqs[] = {
  67         { MAX14577_IRQ_INT1_ADC,        "muic-ADC" },
  68         { MAX14577_IRQ_INT1_ADCLOW,     "muic-ADCLOW" },
  69         { MAX14577_IRQ_INT1_ADCERR,     "muic-ADCError" },
  70         { MAX77836_IRQ_INT1_ADC1K,      "muic-ADC1K" },
  71         { MAX14577_IRQ_INT2_CHGTYP,     "muic-CHGTYP" },
  72         { MAX14577_IRQ_INT2_CHGDETRUN,  "muic-CHGDETRUN" },
  73         { MAX14577_IRQ_INT2_DCDTMR,     "muic-DCDTMR" },
  74         { MAX14577_IRQ_INT2_DBCHG,      "muic-DBCHG" },
  75         { MAX14577_IRQ_INT2_VBVOLT,     "muic-VBVOLT" },
  76         { MAX77836_IRQ_INT2_VIDRM,      "muic-VIDRM" },
  77 };
  78
  79 struct max14577_muic_info {
  80         struct device *dev;
  81         struct max14577 *max14577;
  82         struct extcon_dev *edev;
  83         int prev_cable_type;
  84         int prev_chg_type;
  85         u8 status[MAX14577_MUIC_STATUS_END];
  86
  87         struct max14577_muic_irq *muic_irqs;
  88         unsigned int muic_irqs_num;
  89         bool irq_adc;
  90         bool irq_chg;
  91         struct work_struct irq_work;
  92         struct mutex mutex;
  93
  94         /*
  95          * Use delayed workqueue to detect cable state and then
  96          * notify cable state to notifiee/platform through uevent.
  97          * After completing the booting of platform, the extcon provider
  98          * driver should notify cable state to upper layer.
  99          */
 100         struct delayed_work wq_detcable;
 101
 102         /*
 103          * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 104          * h/w path of COMP2/COMN1 on CONTROL1 register.
 105          */
 106         int path_usb;
 107         int path_uart;
 108 };
 109
 110 enum max14577_muic_cable_group {
 111         MAX14577_CABLE_GROUP_ADC = 0,
 112         MAX14577_CABLE_GROUP_CHG,
 113 };
 114
 115 /* Define supported accessory type */
 116 enum max14577_muic_acc_type {
 117         MAX14577_MUIC_ADC_GROUND = 0x0,
 118         MAX14577_MUIC_ADC_SEND_END_BUTTON,
 119         MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
 120         MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
 121         MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
 122         MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
 123         MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
 124         MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
 125         MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
 126         MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
 127         MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
 128         MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
 129         MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
 130         MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
 131         MAX14577_MUIC_ADC_RESERVED_ACC_1,
 132         MAX14577_MUIC_ADC_RESERVED_ACC_2,
 133         MAX14577_MUIC_ADC_RESERVED_ACC_3,
 134         MAX14577_MUIC_ADC_RESERVED_ACC_4,
 135         MAX14577_MUIC_ADC_RESERVED_ACC_5,
 136         MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
 137         MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
 138         MAX14577_MUIC_ADC_TTY_CONVERTER,
 139         MAX14577_MUIC_ADC_UART_CABLE,
 140         MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
 141         MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
 142         MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
 143         MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
 144         MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
 145         MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
 146         MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
 147         MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
 148         MAX14577_MUIC_ADC_OPEN,
 149 };
 150
 151 static const unsigned int max14577_extcon_cable[] = {
 152         EXTCON_USB,
 153         EXTCON_TA,
 154         EXTCON_FAST_CHARGER,
 155         EXTCON_SLOW_CHARGER,
 156         EXTCON_CHARGE_DOWNSTREAM,
 157         EXTCON_JIG,
 158         EXTCON_NONE,
 159 };
 160
 161 /*
 162  * max14577_muic_set_debounce_time - Set the debounce time of ADC
 163  * @info: the instance including private data of max14577 MUIC
 164  * @time: the debounce time of ADC
 165  */
 166 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
 167                 enum max14577_muic_adc_debounce_time time)
 168 {
 169         u8 ret;
 170
 171         switch (time) {
 172         case ADC_DEBOUNCE_TIME_5MS:
 173         case ADC_DEBOUNCE_TIME_10MS:
 174         case ADC_DEBOUNCE_TIME_25MS:
 175         case ADC_DEBOUNCE_TIME_38_62MS:
 176                 ret = max14577_update_reg(info->max14577->regmap,
 177                                           MAX14577_MUIC_REG_CONTROL3,
 178                                           CTRL3_ADCDBSET_MASK,
 179                                           time << CTRL3_ADCDBSET_SHIFT);
 180                 if (ret) {
 181                         dev_err(info->dev, "failed to set ADC debounce time\n");
 182                         return ret;
 183                 }
 184                 break;
 185         default:
 186                 dev_err(info->dev, "invalid ADC debounce time\n");
 187                 return -EINVAL;
 188         }
 189
 190         return 0;
 191 };
 192
 193 /*
 194  * max14577_muic_set_path - Set hardware line according to attached cable
 195  * @info: the instance including private data of max14577 MUIC
 196  * @value: the path according to attached cable
 197  * @attached: the state of cable (true:attached, false:detached)
 198  *
 199  * The max14577 MUIC device share outside H/W line among a varity of cables
 200  * so, this function set internal path of H/W line according to the type of
 201  * attached cable.
 202  */
 203 static int max14577_muic_set_path(struct max14577_muic_info *info,
 204                 u8 val, bool attached)
 205 {
 206         int ret = 0;
 207         u8 ctrl1, ctrl2 = 0;
 208
 209         /* Set open state to path before changing hw path */
 210         ret = max14577_update_reg(info->max14577->regmap,
 211                                 MAX14577_MUIC_REG_CONTROL1,
 212                                 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
 213         if (ret < 0) {
 214                 dev_err(info->dev, "failed to update MUIC register\n");
 215                 return ret;
 216         }
 217
 218         if (attached)
 219                 ctrl1 = val;
 220         else
 221                 ctrl1 = CTRL1_SW_OPEN;
 222
 223         ret = max14577_update_reg(info->max14577->regmap,
 224                                 MAX14577_MUIC_REG_CONTROL1,
 225                                 CLEAR_IDBEN_MICEN_MASK, ctrl1);
 226         if (ret < 0) {
 227                 dev_err(info->dev, "failed to update MUIC register\n");
 228                 return ret;
 229         }
 230
 231         if (attached)
 232                 ctrl2 |= CTRL2_CPEN_MASK;       /* LowPwr=0, CPEn=1 */
 233         else
 234                 ctrl2 |= CTRL2_LOWPWR_MASK;     /* LowPwr=1, CPEn=0 */
 235
 236         ret = max14577_update_reg(info->max14577->regmap,
 237                         MAX14577_REG_CONTROL2,
 238                         CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
 239         if (ret < 0) {
 240                 dev_err(info->dev, "failed to update MUIC register\n");
 241                 return ret;
 242         }
 243
 244         dev_dbg(info->dev,
 245                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 246                 ctrl1, ctrl2, attached ? "attached" : "detached");
 247
 248         return 0;
 249 }
 250
 251 /*
 252  * max14577_muic_get_cable_type - Return cable type and check cable state
 253  * @info: the instance including private data of max14577 MUIC
 254  * @group: the path according to attached cable
 255  * @attached: store cable state and return
 256  *
 257  * This function check the cable state either attached or detached,
 258  * and then divide precise type of cable according to cable group.
 259  *      - max14577_CABLE_GROUP_ADC
 260  *      - max14577_CABLE_GROUP_CHG
 261  */
 262 static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
 263                 enum max14577_muic_cable_group group, bool *attached)
 264 {
 265         int cable_type = 0;
 266         int adc;
 267         int chg_type;
 268
 269         switch (group) {
 270         case MAX14577_CABLE_GROUP_ADC:
 271                 /*
 272                  * Read ADC value to check cable type and decide cable state
 273                  * according to cable type
 274                  */
 275                 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK;
 276                 adc >>= STATUS1_ADC_SHIFT;
 277
 278                 /*
 279                  * Check current cable state/cable type and store cable type
 280                  * (info->prev_cable_type) for handling cable when cable is
 281                  * detached.
 282                  */
 283                 if (adc == MAX14577_MUIC_ADC_OPEN) {
 284                         *attached = false;
 285
 286                         cable_type = info->prev_cable_type;
 287                         info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
 288                 } else {
 289                         *attached = true;
 290
 291                         cable_type = info->prev_cable_type = adc;
 292                 }
 293                 break;
 294         case MAX14577_CABLE_GROUP_CHG:
 295                 /*
 296                  * Read charger type to check cable type and decide cable state
 297                  * according to type of charger cable.
 298                  */
 299                 chg_type = info->status[MAX14577_MUIC_STATUS2] &
 300                         STATUS2_CHGTYP_MASK;
 301                 chg_type >>= STATUS2_CHGTYP_SHIFT;
 302
 303                 if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
 304                         *attached = false;
 305
 306                         cable_type = info->prev_chg_type;
 307                         info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE;
 308                 } else {
 309                         *attached = true;
 310
 311                         /*
 312                          * Check current cable state/cable type and store cable
 313                          * type(info->prev_chg_type) for handling cable when
 314                          * charger cable is detached.
 315                          */
 316                         cable_type = info->prev_chg_type = chg_type;
 317                 }
 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 max14577_muic_jig_handler(struct max14577_muic_info *info,
 330                 int cable_type, bool attached)
 331 {
 332         int ret = 0;
 333         u8 path = CTRL1_SW_OPEN;
 334
 335         dev_dbg(info->dev,
 336                 "external connector is %s (adc:0x%02x)\n",
 337                 attached ? "attached" : "detached", cable_type);
 338
 339         switch (cable_type) {
 340         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:    /* ADC_JIG_USB_OFF */
 341         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:     /* ADC_JIG_USB_ON */
 342                 /* PATH:AP_USB */
 343                 path = CTRL1_SW_USB;
 344                 break;
 345         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:   /* ADC_JIG_UART_OFF */
 346                 /* PATH:AP_UART */
 347                 path = CTRL1_SW_UART;
 348                 break;
 349         default:
 350                 dev_err(info->dev, "failed to detect %s jig cable\n",
 351                         attached ? "attached" : "detached");
 352                 return -EINVAL;
 353         }
 354
 355         ret = max14577_muic_set_path(info, path, attached);
 356         if (ret < 0)
 357                 return ret;
 358
 359         extcon_set_cable_state_(info->edev, EXTCON_JIG, attached);
 360
 361         return 0;
 362 }
 363
 364 static int max14577_muic_adc_handler(struct max14577_muic_info *info)
 365 {
 366         int cable_type;
 367         bool attached;
 368         int ret = 0;
 369
 370         /* Check accessory state which is either detached or attached */
 371         cable_type = max14577_muic_get_cable_type(info,
 372                                 MAX14577_CABLE_GROUP_ADC, &attached);
 373
 374         dev_dbg(info->dev,
 375                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 376                 attached ? "attached" : "detached", cable_type,
 377                 info->prev_cable_type);
 378
 379         switch (cable_type) {
 380         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
 381         case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
 382         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
 383                 /* JIG */
 384                 ret = max14577_muic_jig_handler(info, cable_type, attached);
 385                 if (ret < 0)
 386                         return ret;
 387                 break;
 388         case MAX14577_MUIC_ADC_GROUND:
 389         case MAX14577_MUIC_ADC_SEND_END_BUTTON:
 390         case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
 391         case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
 392         case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
 393         case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
 394         case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
 395         case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
 396         case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
 397         case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
 398         case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
 399         case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
 400         case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
 401         case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
 402         case MAX14577_MUIC_ADC_RESERVED_ACC_1:
 403         case MAX14577_MUIC_ADC_RESERVED_ACC_2:
 404         case MAX14577_MUIC_ADC_RESERVED_ACC_3:
 405         case MAX14577_MUIC_ADC_RESERVED_ACC_4:
 406         case MAX14577_MUIC_ADC_RESERVED_ACC_5:
 407         case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 408         case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
 409         case MAX14577_MUIC_ADC_TTY_CONVERTER:
 410         case MAX14577_MUIC_ADC_UART_CABLE:
 411         case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
 412         case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
 413         case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
 414         case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
 415         case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 416                 /*
 417                  * This accessory isn't used in general case if it is specially
 418                  * needed to detect additional accessory, should implement
 419                  * proper operation when this accessory is attached/detached.
 420                  */
 421                 dev_info(info->dev,
 422                         "accessory is %s but it isn't used (adc:0x%x)\n",
 423                         attached ? "attached" : "detached", cable_type);
 424                 return -EAGAIN;
 425         default:
 426                 dev_err(info->dev,
 427                         "failed to detect %s accessory (adc:0x%x)\n",
 428                         attached ? "attached" : "detached", cable_type);
 429                 return -EINVAL;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int max14577_muic_chg_handler(struct max14577_muic_info *info)
 436 {
 437         int chg_type;
 438         bool attached;
 439         int ret = 0;
 440
 441         chg_type = max14577_muic_get_cable_type(info,
 442                                 MAX14577_CABLE_GROUP_CHG, &attached);
 443
 444         dev_dbg(info->dev,
 445                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 446                         attached ? "attached" : "detached",
 447                         chg_type, info->prev_chg_type);
 448
 449         switch (chg_type) {
 450         case MAX14577_CHARGER_TYPE_USB:
 451                 /* PATH:AP_USB */
 452                 ret = max14577_muic_set_path(info, info->path_usb, attached);
 453                 if (ret < 0)
 454                         return ret;
 455
 456                 extcon_set_cable_state_(info->edev, EXTCON_USB, attached);
 457                 break;
 458         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 459                 extcon_set_cable_state_(info->edev, EXTCON_TA, attached);
 460                 break;
 461         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 462                 extcon_set_cable_state_(info->edev, EXTCON_CHARGE_DOWNSTREAM,
 463                                         attached);
 464                 break;
 465         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 466                 extcon_set_cable_state_(info->edev, EXTCON_SLOW_CHARGER,
 467                                         attached);
 468                 break;
 469         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 470                 extcon_set_cable_state_(info->edev, EXTCON_FAST_CHARGER,
 471                                         attached);
 472                 break;
 473         case MAX14577_CHARGER_TYPE_NONE:
 474         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 475                 break;
 476         default:
 477                 dev_err(info->dev,
 478                         "failed to detect %s accessory (chg_type:0x%x)\n",
 479                         attached ? "attached" : "detached", chg_type);
 480                 return -EINVAL;
 481         }
 482
 483         return 0;
 484 }
 485
 486 static void max14577_muic_irq_work(struct work_struct *work)
 487 {
 488         struct max14577_muic_info *info = container_of(work,
 489                         struct max14577_muic_info, irq_work);
 490         int ret = 0;
 491
 492         if (!info->edev)
 493                 return;
 494
 495         mutex_lock(&info->mutex);
 496
 497         ret = max14577_bulk_read(info->max14577->regmap,
 498                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 499         if (ret) {
 500                 dev_err(info->dev, "failed to read MUIC register\n");
 501                 mutex_unlock(&info->mutex);
 502                 return;
 503         }
 504
 505         if (info->irq_adc) {
 506                 ret = max14577_muic_adc_handler(info);
 507                 info->irq_adc = false;
 508         }
 509         if (info->irq_chg) {
 510                 ret = max14577_muic_chg_handler(info);
 511                 info->irq_chg = false;
 512         }
 513
 514         if (ret < 0)
 515                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 516
 517         mutex_unlock(&info->mutex);
 518 }
 519
 520 /*
 521  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
 522  * Returns 0 if irq_type does not match registered IRQ for this device type.
 523  */
 524 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type)
 525 {
 526         switch (irq_type) {
 527         case MAX14577_IRQ_INT1_ADC:
 528         case MAX14577_IRQ_INT1_ADCLOW:
 529         case MAX14577_IRQ_INT1_ADCERR:
 530                 /* Handle all of accessory except for
 531                    type of charger accessory */
 532                 info->irq_adc = true;
 533                 return 1;
 534         case MAX14577_IRQ_INT2_CHGTYP:
 535         case MAX14577_IRQ_INT2_CHGDETRUN:
 536         case MAX14577_IRQ_INT2_DCDTMR:
 537         case MAX14577_IRQ_INT2_DBCHG:
 538         case MAX14577_IRQ_INT2_VBVOLT:
 539                 /* Handle charger accessory */
 540                 info->irq_chg = true;
 541                 return 1;
 542         default:
 543                 return 0;
 544         }
 545 }
 546
 547 /*
 548  * Sets irq_adc or irq_chg in max14577_muic_info and returns 1.
 549  * Returns 0 if irq_type does not match registered IRQ for this device type.
 550  */
 551 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type)
 552 {
 553         /* First check common max14577 interrupts */
 554         if (max14577_parse_irq(info, irq_type))
 555                 return 1;
 556
 557         switch (irq_type) {
 558         case MAX77836_IRQ_INT1_ADC1K:
 559                 info->irq_adc = true;
 560                 return 1;
 561         case MAX77836_IRQ_INT2_VIDRM:
 562                 /* Handle charger accessory */
 563                 info->irq_chg = true;
 564                 return 1;
 565         default:
 566                 return 0;
 567         }
 568 }
 569
 570 static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
 571 {
 572         struct max14577_muic_info *info = data;
 573         int i, irq_type = -1;
 574         bool irq_parsed;
 575
 576         /*
 577          * We may be called multiple times for different nested IRQ-s.
 578          * Including changes in INT1_ADC and INT2_CGHTYP at once.
 579          * However we only need to know whether it was ADC, charger
 580          * or both interrupts so decode IRQ and turn on proper flags.
 581          */
 582         for (i = 0; i < info->muic_irqs_num; i++)
 583                 if (irq == info->muic_irqs[i].virq)
 584                         irq_type = info->muic_irqs[i].irq;
 585
 586         switch (info->max14577->dev_type) {
 587         case MAXIM_DEVICE_TYPE_MAX77836:
 588                 irq_parsed = max77836_parse_irq(info, irq_type);
 589                 break;
 590         case MAXIM_DEVICE_TYPE_MAX14577:
 591         default:
 592                 irq_parsed = max14577_parse_irq(info, irq_type);
 593                 break;
 594         }
 595
 596         if (!irq_parsed) {
 597                 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
 598                                 irq_type);
 599                 return IRQ_HANDLED;
 600         }
 601         schedule_work(&info->irq_work);
 602
 603         return IRQ_HANDLED;
 604 }
 605
 606 static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
 607 {
 608         int ret = 0;
 609         int adc;
 610         int chg_type;
 611         bool attached;
 612
 613         mutex_lock(&info->mutex);
 614
 615         /* Read STATUSx register to detect accessory */
 616         ret = max14577_bulk_read(info->max14577->regmap,
 617                         MAX14577_MUIC_REG_STATUS1, info->status, 2);
 618         if (ret) {
 619                 dev_err(info->dev, "failed to read MUIC register\n");
 620                 mutex_unlock(&info->mutex);
 621                 return ret;
 622         }
 623
 624         adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
 625                                         &attached);
 626         if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
 627                 ret = max14577_muic_adc_handler(info);
 628                 if (ret < 0) {
 629                         dev_err(info->dev, "Cannot detect accessory\n");
 630                         mutex_unlock(&info->mutex);
 631                         return ret;
 632                 }
 633         }
 634
 635         chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
 636                                         &attached);
 637         if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
 638                 ret = max14577_muic_chg_handler(info);
 639                 if (ret < 0) {
 640                         dev_err(info->dev, "Cannot detect charger accessory\n");
 641                         mutex_unlock(&info->mutex);
 642                         return ret;
 643                 }
 644         }
 645
 646         mutex_unlock(&info->mutex);
 647
 648         return 0;
 649 }
 650
 651 static void max14577_muic_detect_cable_wq(struct work_struct *work)
 652 {
 653         struct max14577_muic_info *info = container_of(to_delayed_work(work),
 654                                 struct max14577_muic_info, wq_detcable);
 655
 656         max14577_muic_detect_accessory(info);
 657 }
 658
 659 static int max14577_muic_probe(struct platform_device *pdev)
 660 {
 661         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 662         struct max14577_muic_info *info;
 663         int delay_jiffies;
 664         int ret;
 665         int i;
 666         u8 id;
 667
 668         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 669         if (!info)
 670                 return -ENOMEM;
 671
 672         info->dev = &pdev->dev;
 673         info->max14577 = max14577;
 674
 675         platform_set_drvdata(pdev, info);
 676         mutex_init(&info->mutex);
 677
 678         INIT_WORK(&info->irq_work, max14577_muic_irq_work);
 679
 680         switch (max14577->dev_type) {
 681         case MAXIM_DEVICE_TYPE_MAX77836:
 682                 info->muic_irqs = max77836_muic_irqs;
 683                 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs);
 684                 break;
 685         case MAXIM_DEVICE_TYPE_MAX14577:
 686         default:
 687                 info->muic_irqs = max14577_muic_irqs;
 688                 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs);
 689         }
 690
 691         /* Support irq domain for max14577 MUIC device */
 692         for (i = 0; i < info->muic_irqs_num; i++) {
 693                 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i];
 694                 unsigned int virq = 0;
 695
 696                 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
 697                 if (virq <= 0)
 698                         return -EINVAL;
 699                 muic_irq->virq = virq;
 700
 701                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 702                                 max14577_muic_irq_handler,
 703                                 IRQF_NO_SUSPEND,
 704                                 muic_irq->name, info);
 705                 if (ret) {
 706                         dev_err(&pdev->dev,
 707                                 "failed: irq request (IRQ: %d, error :%d)\n",
 708                                 muic_irq->irq, ret);
 709                         return ret;
 710                 }
 711         }
 712
 713         /* Initialize extcon device */
 714         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 715                                               max14577_extcon_cable);
 716         if (IS_ERR(info->edev)) {
 717                 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 718                 return -ENOMEM;
 719         }
 720
 721         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 722         if (ret) {
 723                 dev_err(&pdev->dev, "failed to register extcon device\n");
 724                 return ret;
 725         }
 726
 727         /* Default h/w line path */
 728         info->path_usb = CTRL1_SW_USB;
 729         info->path_uart = CTRL1_SW_UART;
 730         delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 731
 732         /* Set initial path for UART */
 733         max14577_muic_set_path(info, info->path_uart, true);
 734
 735         /* Check revision number of MUIC device*/
 736         ret = max14577_read_reg(info->max14577->regmap,
 737                         MAX14577_REG_DEVICEID, &id);
 738         if (ret < 0) {
 739                 dev_err(&pdev->dev, "failed to read revision number\n");
 740                 return ret;
 741         }
 742         dev_info(info->dev, "device ID : 0x%x\n", id);
 743
 744         /* Set ADC debounce time */
 745         max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 746
 747         /*
 748          * Detect accessory after completing the initialization of platform
 749          *
 750          * - Use delayed workqueue to detect cable state and then
 751          * notify cable state to notifiee/platform through uevent.
 752          * After completing the booting of platform, the extcon provider
 753          * driver should notify cable state to upper layer.
 754          */
 755         INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq);
 756         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 757                         delay_jiffies);
 758
 759         return ret;
 760 }
 761
 762 static int max14577_muic_remove(struct platform_device *pdev)
 763 {
 764         struct max14577_muic_info *info = platform_get_drvdata(pdev);
 765
 766         cancel_work_sync(&info->irq_work);
 767
 768         return 0;
 769 }
 770
 771 static const struct platform_device_id max14577_muic_id[] = {
 772         { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, },
 773         { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, },
 774         { }
 775 };
 776 MODULE_DEVICE_TABLE(platform, max14577_muic_id);
 777
 778 static struct platform_driver max14577_muic_driver = {
 779         .driver         = {
 780                 .name   = "max14577-muic",
 781         },
 782         .probe          = max14577_muic_probe,
 783         .remove         = max14577_muic_remove,
 784         .id_table       = max14577_muic_id,
 785 };
 786
 787 module_platform_driver(max14577_muic_driver);
 788
 789 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver");
 790 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 791 MODULE_LICENSE("GPL");
 792 MODULE_ALIAS("platform:extcon-max14577");