linux/drivers/extcon/extcon-max8997.c
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   1/*
   2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
   3 *
   4 *  Copyright (C) 2012 Samsung Electronics
   5 *  Donggeun Kim <dg77.kim@samsung.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/i2c.h>
  21#include <linux/slab.h>
  22#include <linux/interrupt.h>
  23#include <linux/err.h>
  24#include <linux/platform_device.h>
  25#include <linux/kobject.h>
  26#include <linux/mfd/max8997.h>
  27#include <linux/mfd/max8997-private.h>
  28#include <linux/extcon.h>
  29#include <linux/irqdomain.h>
  30
  31#define DEV_NAME                        "max8997-muic"
  32#define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
  33
  34enum max8997_muic_adc_debounce_time {
  35        ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
  36        ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
  37        ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
  38        ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
  39};
  40
  41struct max8997_muic_irq {
  42        unsigned int irq;
  43        const char *name;
  44        unsigned int virq;
  45};
  46
  47static struct max8997_muic_irq muic_irqs[] = {
  48        { MAX8997_MUICIRQ_ADCError,     "muic-ADCERROR" },
  49        { MAX8997_MUICIRQ_ADCLow,       "muic-ADCLOW" },
  50        { MAX8997_MUICIRQ_ADC,          "muic-ADC" },
  51        { MAX8997_MUICIRQ_VBVolt,       "muic-VBVOLT" },
  52        { MAX8997_MUICIRQ_DBChg,        "muic-DBCHG" },
  53        { MAX8997_MUICIRQ_DCDTmr,       "muic-DCDTMR" },
  54        { MAX8997_MUICIRQ_ChgDetRun,    "muic-CHGDETRUN" },
  55        { MAX8997_MUICIRQ_ChgTyp,       "muic-CHGTYP" },
  56        { MAX8997_MUICIRQ_OVP,          "muic-OVP" },
  57};
  58
  59/* Define supported cable type */
  60enum max8997_muic_acc_type {
  61        MAX8997_MUIC_ADC_GROUND = 0x0,
  62        MAX8997_MUIC_ADC_MHL,                   /* MHL*/
  63        MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
  64        MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
  65        MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
  66        MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
  67        MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
  68        MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
  69        MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
  70        MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
  71        MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
  72        MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
  73        MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
  74        MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
  75        MAX8997_MUIC_ADC_RESERVED_ACC_1,
  76        MAX8997_MUIC_ADC_RESERVED_ACC_2,
  77        MAX8997_MUIC_ADC_RESERVED_ACC_3,
  78        MAX8997_MUIC_ADC_RESERVED_ACC_4,
  79        MAX8997_MUIC_ADC_RESERVED_ACC_5,
  80        MAX8997_MUIC_ADC_CEA936_AUDIO,
  81        MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
  82        MAX8997_MUIC_ADC_TTY_CONVERTER,
  83        MAX8997_MUIC_ADC_UART_CABLE,
  84        MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
  85        MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF,  /* JIG-USB-OFF */
  86        MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON,   /* JIG-USB-ON */
  87        MAX8997_MUIC_ADC_AV_CABLE_NOLOAD,       /* DESKDOCK */
  88        MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
  89        MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
  90        MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON,  /* CARDOCK */
  91        MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
  92        MAX8997_MUIC_ADC_OPEN,                  /* OPEN */
  93};
  94
  95enum max8997_muic_cable_group {
  96        MAX8997_CABLE_GROUP_ADC = 0,
  97        MAX8997_CABLE_GROUP_ADC_GND,
  98        MAX8997_CABLE_GROUP_CHG,
  99        MAX8997_CABLE_GROUP_VBVOLT,
 100};
 101
 102enum max8997_muic_usb_type {
 103        MAX8997_USB_HOST,
 104        MAX8997_USB_DEVICE,
 105};
 106
 107enum max8997_muic_charger_type {
 108        MAX8997_CHARGER_TYPE_NONE = 0,
 109        MAX8997_CHARGER_TYPE_USB,
 110        MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
 111        MAX8997_CHARGER_TYPE_DEDICATED_CHG,
 112        MAX8997_CHARGER_TYPE_500MA,
 113        MAX8997_CHARGER_TYPE_1A,
 114        MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
 115};
 116
 117struct max8997_muic_info {
 118        struct device *dev;
 119        struct i2c_client *muic;
 120        struct extcon_dev *edev;
 121        int prev_cable_type;
 122        int prev_chg_type;
 123        u8 status[2];
 124
 125        int irq;
 126        struct work_struct irq_work;
 127        struct mutex mutex;
 128
 129        struct max8997_muic_platform_data *muic_pdata;
 130        enum max8997_muic_charger_type pre_charger_type;
 131
 132        /*
 133         * Use delayed workqueue to detect cable state and then
 134         * notify cable state to notifiee/platform through uevent.
 135         * After completing the booting of platform, the extcon provider
 136         * driver should notify cable state to upper layer.
 137         */
 138        struct delayed_work wq_detcable;
 139
 140        /*
 141         * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 142         * h/w path of COMP2/COMN1 on CONTROL1 register.
 143         */
 144        int path_usb;
 145        int path_uart;
 146};
 147
 148enum {
 149        EXTCON_CABLE_USB = 0,
 150        EXTCON_CABLE_USB_HOST,
 151        EXTCON_CABLE_TA,
 152        EXTCON_CABLE_FAST_CHARGER,
 153        EXTCON_CABLE_SLOW_CHARGER,
 154        EXTCON_CABLE_CHARGE_DOWNSTREAM,
 155        EXTCON_CABLE_MHL,
 156        EXTCON_CABLE_DOCK_DESK,
 157        EXTCON_CABLE_DOCK_CARD,
 158        EXTCON_CABLE_JIG,
 159
 160        _EXTCON_CABLE_NUM,
 161};
 162
 163static const char *max8997_extcon_cable[] = {
 164        [EXTCON_CABLE_USB]                      = "USB",
 165        [EXTCON_CABLE_USB_HOST]                 = "USB-Host",
 166        [EXTCON_CABLE_TA]                       = "TA",
 167        [EXTCON_CABLE_FAST_CHARGER]             = "Fast-charger",
 168        [EXTCON_CABLE_SLOW_CHARGER]             = "Slow-charger",
 169        [EXTCON_CABLE_CHARGE_DOWNSTREAM]        = "Charge-downstream",
 170        [EXTCON_CABLE_MHL]                      = "MHL",
 171        [EXTCON_CABLE_DOCK_DESK]                = "Dock-Desk",
 172        [EXTCON_CABLE_DOCK_CARD]                = "Dock-Card",
 173        [EXTCON_CABLE_JIG]                      = "JIG",
 174
 175        NULL,
 176};
 177
 178/*
 179 * max8997_muic_set_debounce_time - Set the debounce time of ADC
 180 * @info: the instance including private data of max8997 MUIC
 181 * @time: the debounce time of ADC
 182 */
 183static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
 184                enum max8997_muic_adc_debounce_time time)
 185{
 186        int ret;
 187
 188        switch (time) {
 189        case ADC_DEBOUNCE_TIME_0_5MS:
 190        case ADC_DEBOUNCE_TIME_10MS:
 191        case ADC_DEBOUNCE_TIME_25MS:
 192        case ADC_DEBOUNCE_TIME_38_62MS:
 193                ret = max8997_update_reg(info->muic,
 194                                          MAX8997_MUIC_REG_CONTROL3,
 195                                          time << CONTROL3_ADCDBSET_SHIFT,
 196                                          CONTROL3_ADCDBSET_MASK);
 197                if (ret) {
 198                        dev_err(info->dev, "failed to set ADC debounce time\n");
 199                        return ret;
 200                }
 201                break;
 202        default:
 203                dev_err(info->dev, "invalid ADC debounce time\n");
 204                return -EINVAL;
 205        }
 206
 207        return 0;
 208};
 209
 210/*
 211 * max8997_muic_set_path - Set hardware line according to attached cable
 212 * @info: the instance including private data of max8997 MUIC
 213 * @value: the path according to attached cable
 214 * @attached: the state of cable (true:attached, false:detached)
 215 *
 216 * The max8997 MUIC device share outside H/W line among a varity of cables,
 217 * so this function set internal path of H/W line according to the type of
 218 * attached cable.
 219 */
 220static int max8997_muic_set_path(struct max8997_muic_info *info,
 221                u8 val, bool attached)
 222{
 223        int ret = 0;
 224        u8 ctrl1, ctrl2 = 0;
 225
 226        if (attached)
 227                ctrl1 = val;
 228        else
 229                ctrl1 = CONTROL1_SW_OPEN;
 230
 231        ret = max8997_update_reg(info->muic,
 232                        MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
 233        if (ret < 0) {
 234                dev_err(info->dev, "failed to update MUIC register\n");
 235                return ret;
 236        }
 237
 238        if (attached)
 239                ctrl2 |= CONTROL2_CPEN_MASK;    /* LowPwr=0, CPEn=1 */
 240        else
 241                ctrl2 |= CONTROL2_LOWPWR_MASK;  /* LowPwr=1, CPEn=0 */
 242
 243        ret = max8997_update_reg(info->muic,
 244                        MAX8997_MUIC_REG_CONTROL2, ctrl2,
 245                        CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
 246        if (ret < 0) {
 247                dev_err(info->dev, "failed to update MUIC register\n");
 248                return ret;
 249        }
 250
 251        dev_info(info->dev,
 252                "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 253                ctrl1, ctrl2, attached ? "attached" : "detached");
 254
 255        return 0;
 256}
 257
 258/*
 259 * max8997_muic_get_cable_type - Return cable type and check cable state
 260 * @info: the instance including private data of max8997 MUIC
 261 * @group: the path according to attached cable
 262 * @attached: store cable state and return
 263 *
 264 * This function check the cable state either attached or detached,
 265 * and then divide precise type of cable according to cable group.
 266 *      - MAX8997_CABLE_GROUP_ADC
 267 *      - MAX8997_CABLE_GROUP_CHG
 268 */
 269static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
 270                enum max8997_muic_cable_group group, bool *attached)
 271{
 272        int cable_type = 0;
 273        int adc;
 274        int chg_type;
 275
 276        switch (group) {
 277        case MAX8997_CABLE_GROUP_ADC:
 278                /*
 279                 * Read ADC value to check cable type and decide cable state
 280                 * according to cable type
 281                 */
 282                adc = info->status[0] & STATUS1_ADC_MASK;
 283                adc >>= STATUS1_ADC_SHIFT;
 284
 285                /*
 286                 * Check current cable state/cable type and store cable type
 287                 * (info->prev_cable_type) for handling cable when cable is
 288                 * detached.
 289                 */
 290                if (adc == MAX8997_MUIC_ADC_OPEN) {
 291                        *attached = false;
 292
 293                        cable_type = info->prev_cable_type;
 294                        info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
 295                } else {
 296                        *attached = true;
 297
 298                        cable_type = info->prev_cable_type = adc;
 299                }
 300                break;
 301        case MAX8997_CABLE_GROUP_CHG:
 302                /*
 303                 * Read charger type to check cable type and decide cable state
 304                 * according to type of charger cable.
 305                 */
 306                chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
 307                chg_type >>= STATUS2_CHGTYP_SHIFT;
 308
 309                if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
 310                        *attached = false;
 311
 312                        cable_type = info->prev_chg_type;
 313                        info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
 314                } else {
 315                        *attached = true;
 316
 317                        /*
 318                         * Check current cable state/cable type and store cable
 319                         * type(info->prev_chg_type) for handling cable when
 320                         * charger cable is detached.
 321                         */
 322                        cable_type = info->prev_chg_type = chg_type;
 323                }
 324
 325                break;
 326        default:
 327                dev_err(info->dev, "Unknown cable group (%d)\n", group);
 328                cable_type = -EINVAL;
 329                break;
 330        }
 331
 332        return cable_type;
 333}
 334
 335static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 336                        enum max8997_muic_usb_type usb_type, bool attached)
 337{
 338        int ret = 0;
 339
 340        if (usb_type == MAX8997_USB_HOST) {
 341                ret = max8997_muic_set_path(info, info->path_usb, attached);
 342                if (ret < 0) {
 343                        dev_err(info->dev, "failed to update muic register\n");
 344                        return ret;
 345                }
 346        }
 347
 348        switch (usb_type) {
 349        case MAX8997_USB_HOST:
 350                extcon_set_cable_state(info->edev, "USB-Host", attached);
 351                break;
 352        case MAX8997_USB_DEVICE:
 353                extcon_set_cable_state(info->edev, "USB", attached);
 354                break;
 355        default:
 356                dev_err(info->dev, "failed to detect %s usb cable\n",
 357                        attached ? "attached" : "detached");
 358                return -EINVAL;
 359        }
 360
 361        return 0;
 362}
 363
 364static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 365                        int cable_type, bool attached)
 366{
 367        int ret = 0;
 368
 369        ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
 370        if (ret) {
 371                dev_err(info->dev, "failed to update muic register\n");
 372                return ret;
 373        }
 374
 375        switch (cable_type) {
 376        case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 377                extcon_set_cable_state(info->edev, "Dock-desk", attached);
 378                break;
 379        case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 380                extcon_set_cable_state(info->edev, "Dock-card", attached);
 381                break;
 382        default:
 383                dev_err(info->dev, "failed to detect %s dock device\n",
 384                        attached ? "attached" : "detached");
 385                return -EINVAL;
 386        }
 387
 388        return 0;
 389}
 390
 391static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 392                        bool attached)
 393{
 394        int ret = 0;
 395
 396        /* switch to UART */
 397        ret = max8997_muic_set_path(info, info->path_uart, attached);
 398        if (ret) {
 399                dev_err(info->dev, "failed to update muic register\n");
 400                return ret;
 401        }
 402
 403        extcon_set_cable_state(info->edev, "JIG", attached);
 404
 405        return 0;
 406}
 407
 408static int max8997_muic_adc_handler(struct max8997_muic_info *info)
 409{
 410        int cable_type;
 411        bool attached;
 412        int ret = 0;
 413
 414        /* Check cable state which is either detached or attached */
 415        cable_type = max8997_muic_get_cable_type(info,
 416                                MAX8997_CABLE_GROUP_ADC, &attached);
 417
 418        switch (cable_type) {
 419        case MAX8997_MUIC_ADC_GROUND:
 420                ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
 421                if (ret < 0)
 422                        return ret;
 423                break;
 424        case MAX8997_MUIC_ADC_MHL:
 425                extcon_set_cable_state(info->edev, "MHL", attached);
 426                break;
 427        case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
 428        case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
 429                ret = max8997_muic_handle_usb(info,
 430                                             MAX8997_USB_DEVICE, attached);
 431                if (ret < 0)
 432                        return ret;
 433                break;
 434        case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
 435        case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
 436                ret = max8997_muic_handle_dock(info, cable_type, attached);
 437                if (ret < 0)
 438                        return ret;
 439                break;
 440        case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
 441                ret = max8997_muic_handle_jig_uart(info, attached);
 442                break;
 443        case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
 444        case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
 445        case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
 446        case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
 447        case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
 448        case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
 449        case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
 450        case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
 451        case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
 452        case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
 453        case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
 454        case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
 455        case MAX8997_MUIC_ADC_RESERVED_ACC_1:
 456        case MAX8997_MUIC_ADC_RESERVED_ACC_2:
 457        case MAX8997_MUIC_ADC_RESERVED_ACC_3:
 458        case MAX8997_MUIC_ADC_RESERVED_ACC_4:
 459        case MAX8997_MUIC_ADC_RESERVED_ACC_5:
 460        case MAX8997_MUIC_ADC_CEA936_AUDIO:
 461        case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
 462        case MAX8997_MUIC_ADC_TTY_CONVERTER:
 463        case MAX8997_MUIC_ADC_UART_CABLE:
 464        case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
 465        case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
 466        case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
 467                /*
 468                 * This cable isn't used in general case if it is specially
 469                 * needed to detect additional cable, should implement
 470                 * proper operation when this cable is attached/detached.
 471                 */
 472                dev_info(info->dev,
 473                        "cable is %s but it isn't used (type:0x%x)\n",
 474                        attached ? "attached" : "detached", cable_type);
 475                return -EAGAIN;
 476        default:
 477                dev_err(info->dev,
 478                        "failed to detect %s unknown cable (type:0x%x)\n",
 479                        attached ? "attached" : "detached", cable_type);
 480                return -EINVAL;
 481        }
 482
 483        return 0;
 484}
 485
 486static int max8997_muic_chg_handler(struct max8997_muic_info *info)
 487{
 488        int chg_type;
 489        bool attached;
 490        int adc;
 491
 492        chg_type = max8997_muic_get_cable_type(info,
 493                                MAX8997_CABLE_GROUP_CHG, &attached);
 494
 495        switch (chg_type) {
 496        case MAX8997_CHARGER_TYPE_NONE:
 497                break;
 498        case MAX8997_CHARGER_TYPE_USB:
 499                adc = info->status[0] & STATUS1_ADC_MASK;
 500                adc >>= STATUS1_ADC_SHIFT;
 501
 502                if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
 503                        max8997_muic_handle_usb(info,
 504                                        MAX8997_USB_DEVICE, attached);
 505                }
 506                break;
 507        case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 508                extcon_set_cable_state(info->edev,
 509                                      "Charge-downstream", attached);
 510                break;
 511        case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 512                extcon_set_cable_state(info->edev, "TA", attached);
 513                break;
 514        case MAX8997_CHARGER_TYPE_500MA:
 515                extcon_set_cable_state(info->edev, "Slow-charger", attached);
 516                break;
 517        case MAX8997_CHARGER_TYPE_1A:
 518                extcon_set_cable_state(info->edev, "Fast-charger", attached);
 519                break;
 520        default:
 521                dev_err(info->dev,
 522                        "failed to detect %s unknown chg cable (type:0x%x)\n",
 523                        attached ? "attached" : "detached", chg_type);
 524                return -EINVAL;
 525        }
 526
 527        return 0;
 528}
 529
 530static void max8997_muic_irq_work(struct work_struct *work)
 531{
 532        struct max8997_muic_info *info = container_of(work,
 533                        struct max8997_muic_info, irq_work);
 534        int irq_type = 0;
 535        int i, ret;
 536
 537        if (!info->edev)
 538                return;
 539
 540        mutex_lock(&info->mutex);
 541
 542        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 543                if (info->irq == muic_irqs[i].virq)
 544                        irq_type = muic_irqs[i].irq;
 545
 546        ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 547                                2, info->status);
 548        if (ret) {
 549                dev_err(info->dev, "failed to read muic register\n");
 550                mutex_unlock(&info->mutex);
 551                return;
 552        }
 553
 554        switch (irq_type) {
 555        case MAX8997_MUICIRQ_ADCError:
 556        case MAX8997_MUICIRQ_ADCLow:
 557        case MAX8997_MUICIRQ_ADC:
 558                /* Handle all of cable except for charger cable */
 559                ret = max8997_muic_adc_handler(info);
 560                break;
 561        case MAX8997_MUICIRQ_VBVolt:
 562        case MAX8997_MUICIRQ_DBChg:
 563        case MAX8997_MUICIRQ_DCDTmr:
 564        case MAX8997_MUICIRQ_ChgDetRun:
 565        case MAX8997_MUICIRQ_ChgTyp:
 566                /* Handle charger cable */
 567                ret = max8997_muic_chg_handler(info);
 568                break;
 569        case MAX8997_MUICIRQ_OVP:
 570                break;
 571        default:
 572                dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 573                                irq_type);
 574                mutex_unlock(&info->mutex);
 575                return;
 576        }
 577
 578        if (ret < 0)
 579                dev_err(info->dev, "failed to handle MUIC interrupt\n");
 580
 581        mutex_unlock(&info->mutex);
 582
 583        return;
 584}
 585
 586static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 587{
 588        struct max8997_muic_info *info = data;
 589
 590        dev_dbg(info->dev, "irq:%d\n", irq);
 591        info->irq = irq;
 592
 593        schedule_work(&info->irq_work);
 594
 595        return IRQ_HANDLED;
 596}
 597
 598static int max8997_muic_detect_dev(struct max8997_muic_info *info)
 599{
 600        int ret = 0;
 601        int adc;
 602        int chg_type;
 603        bool attached;
 604
 605        mutex_lock(&info->mutex);
 606
 607        /* Read STATUSx register to detect accessory */
 608        ret = max8997_bulk_read(info->muic,
 609                        MAX8997_MUIC_REG_STATUS1, 2, info->status);
 610        if (ret) {
 611                dev_err(info->dev, "failed to read MUIC register\n");
 612                mutex_unlock(&info->mutex);
 613                return ret;
 614        }
 615
 616        adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
 617                                        &attached);
 618        if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
 619                ret = max8997_muic_adc_handler(info);
 620                if (ret < 0) {
 621                        dev_err(info->dev, "Cannot detect ADC cable\n");
 622                        mutex_unlock(&info->mutex);
 623                        return ret;
 624                }
 625        }
 626
 627        chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
 628                                        &attached);
 629        if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
 630                ret = max8997_muic_chg_handler(info);
 631                if (ret < 0) {
 632                        dev_err(info->dev, "Cannot detect charger cable\n");
 633                        mutex_unlock(&info->mutex);
 634                        return ret;
 635                }
 636        }
 637
 638        mutex_unlock(&info->mutex);
 639
 640        return 0;
 641}
 642
 643static void max8997_muic_detect_cable_wq(struct work_struct *work)
 644{
 645        struct max8997_muic_info *info = container_of(to_delayed_work(work),
 646                                struct max8997_muic_info, wq_detcable);
 647        int ret;
 648
 649        ret = max8997_muic_detect_dev(info);
 650        if (ret < 0)
 651                dev_err(info->dev, "failed to detect cable type\n");
 652}
 653
 654static int max8997_muic_probe(struct platform_device *pdev)
 655{
 656        struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 657        struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 658        struct max8997_muic_info *info;
 659        int delay_jiffies;
 660        int ret, i;
 661
 662        info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
 663                            GFP_KERNEL);
 664        if (!info) {
 665                dev_err(&pdev->dev, "failed to allocate memory\n");
 666                return -ENOMEM;
 667        }
 668
 669        info->dev = &pdev->dev;
 670        info->muic = max8997->muic;
 671
 672        platform_set_drvdata(pdev, info);
 673        mutex_init(&info->mutex);
 674
 675        INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 676
 677        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 678                struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 679                unsigned int virq = 0;
 680
 681                virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 682                if (!virq) {
 683                        ret = -EINVAL;
 684                        goto err_irq;
 685                }
 686                muic_irq->virq = virq;
 687
 688                ret = request_threaded_irq(virq, NULL,
 689                                max8997_muic_irq_handler,
 690                                IRQF_NO_SUSPEND,
 691                                muic_irq->name, info);
 692                if (ret) {
 693                        dev_err(&pdev->dev,
 694                                "failed: irq request (IRQ: %d,"
 695                                " error :%d)\n",
 696                                muic_irq->irq, ret);
 697                        goto err_irq;
 698                }
 699        }
 700
 701        /* External connector */
 702        info->edev = devm_kzalloc(&pdev->dev, sizeof(struct extcon_dev),
 703                                  GFP_KERNEL);
 704        if (!info->edev) {
 705                dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 706                ret = -ENOMEM;
 707                goto err_irq;
 708        }
 709        info->edev->name = DEV_NAME;
 710        info->edev->dev.parent = &pdev->dev;
 711        info->edev->supported_cable = max8997_extcon_cable;
 712        ret = extcon_dev_register(info->edev);
 713        if (ret) {
 714                dev_err(&pdev->dev, "failed to register extcon device\n");
 715                goto err_irq;
 716        }
 717
 718        if (pdata->muic_pdata) {
 719                struct max8997_muic_platform_data *muic_pdata
 720                        = pdata->muic_pdata;
 721
 722                /* Initialize registers according to platform data */
 723                for (i = 0; i < muic_pdata->num_init_data; i++) {
 724                        max8997_write_reg(info->muic,
 725                                        muic_pdata->init_data[i].addr,
 726                                        muic_pdata->init_data[i].data);
 727                }
 728
 729                /*
 730                 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
 731                 * h/w path of COMP2/COMN1 on CONTROL1 register.
 732                 */
 733                if (muic_pdata->path_uart)
 734                        info->path_uart = muic_pdata->path_uart;
 735                else
 736                        info->path_uart = CONTROL1_SW_UART;
 737
 738                if (muic_pdata->path_usb)
 739                        info->path_usb = muic_pdata->path_usb;
 740                else
 741                        info->path_usb = CONTROL1_SW_USB;
 742
 743                /*
 744                 * Default delay time for detecting cable state
 745                 * after certain time.
 746                 */
 747                if (muic_pdata->detcable_delay_ms)
 748                        delay_jiffies =
 749                                msecs_to_jiffies(muic_pdata->detcable_delay_ms);
 750                else
 751                        delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 752        } else {
 753                info->path_uart = CONTROL1_SW_UART;
 754                info->path_usb = CONTROL1_SW_USB;
 755                delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
 756        }
 757
 758        /* Set initial path for UART */
 759         max8997_muic_set_path(info, info->path_uart, true);
 760
 761        /* Set ADC debounce time */
 762        max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 763
 764        /*
 765         * Detect accessory after completing the initialization of platform
 766         *
 767         * - Use delayed workqueue to detect cable state and then
 768         * notify cable state to notifiee/platform through uevent.
 769         * After completing the booting of platform, the extcon provider
 770         * driver should notify cable state to upper layer.
 771         */
 772        INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
 773        schedule_delayed_work(&info->wq_detcable, delay_jiffies);
 774
 775        return 0;
 776
 777err_irq:
 778        while (--i >= 0)
 779                free_irq(muic_irqs[i].virq, info);
 780        return ret;
 781}
 782
 783static int max8997_muic_remove(struct platform_device *pdev)
 784{
 785        struct max8997_muic_info *info = platform_get_drvdata(pdev);
 786        int i;
 787
 788        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 789                free_irq(muic_irqs[i].virq, info);
 790        cancel_work_sync(&info->irq_work);
 791
 792        extcon_dev_unregister(info->edev);
 793
 794        return 0;
 795}
 796
 797static struct platform_driver max8997_muic_driver = {
 798        .driver         = {
 799                .name   = DEV_NAME,
 800                .owner  = THIS_MODULE,
 801        },
 802        .probe          = max8997_muic_probe,
 803        .remove         = max8997_muic_remove,
 804};
 805
 806module_platform_driver(max8997_muic_driver);
 807
 808MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 809MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 810MODULE_LICENSE("GPL");
 811
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