drivers/extcon/extcon-rt8973a.c

   1 /*
   2  * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches
   3  *
   4  * Copyright (c) 2014 Samsung Electronics Co., Ltd
   5  * Author: Chanwoo Choi <cw00.choi@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/input.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irqdomain.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regmap.h>
  22 #include <linux/slab.h>
  23 #include <linux/extcon.h>
  24
  25 #include "extcon-rt8973a.h"
  26
  27 #define DELAY_MS_DEFAULT                20000   /* unit: millisecond */
  28
  29 struct muic_irq {
  30         unsigned int irq;
  31         const char *name;
  32         unsigned int virq;
  33 };
  34
  35 struct reg_data {
  36         u8 reg;
  37         u8 mask;
  38         u8 val;
  39         bool invert;
  40 };
  41
  42 struct rt8973a_muic_info {
  43         struct device *dev;
  44         struct extcon_dev *edev;
  45
  46         struct i2c_client *i2c;
  47         struct regmap *regmap;
  48
  49         struct regmap_irq_chip_data *irq_data;
  50         struct muic_irq *muic_irqs;
  51         unsigned int num_muic_irqs;
  52         int irq;
  53         bool irq_attach;
  54         bool irq_detach;
  55         bool irq_ovp;
  56         bool irq_otp;
  57         struct work_struct irq_work;
  58
  59         struct reg_data *reg_data;
  60         unsigned int num_reg_data;
  61         bool auto_config;
  62
  63         struct mutex mutex;
  64
  65         /*
  66          * Use delayed workqueue to detect cable state and then
  67          * notify cable state to notifiee/platform through uevent.
  68          * After completing the booting of platform, the extcon provider
  69          * driver should notify cable state to upper layer.
  70          */
  71         struct delayed_work wq_detcable;
  72 };
  73
  74 /* Default value of RT8973A register to bring up MUIC device. */
  75 static struct reg_data rt8973a_reg_data[] = {
  76         {
  77                 .reg = RT8973A_REG_CONTROL1,
  78                 .mask = RT8973A_REG_CONTROL1_ADC_EN_MASK
  79                         | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
  80                         | RT8973A_REG_CONTROL1_CHGTYP_MASK
  81                         | RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK
  82                         | RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK
  83                         | RT8973A_REG_CONTROL1_INTM_MASK,
  84                 .val = RT8973A_REG_CONTROL1_ADC_EN_MASK
  85                         | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
  86                         | RT8973A_REG_CONTROL1_CHGTYP_MASK,
  87                 .invert = false,
  88         },
  89         { /* sentinel */ }
  90 };
  91
  92 /* List of detectable cables */
  93 enum {
  94         EXTCON_CABLE_USB = 0,
  95         EXTCON_CABLE_USB_HOST,
  96         EXTCON_CABLE_TA,
  97         EXTCON_CABLE_JIG,
  98
  99         EXTCON_CABLE_END,
 100 };
 101
 102 static const char *rt8973a_extcon_cable[] = {
 103         [EXTCON_CABLE_USB]              = "USB",
 104         [EXTCON_CABLE_USB_HOST]         = "USB-Host",
 105         [EXTCON_CABLE_TA]               = "TA",
 106         [EXTCON_CABLE_JIG]              = "JIG",
 107         NULL,
 108 };
 109
 110 /* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
 111 enum rt8973a_event_type {
 112         RT8973A_EVENT_ATTACH = 1,
 113         RT8973A_EVENT_DETACH,
 114         RT8973A_EVENT_OVP,
 115         RT8973A_EVENT_OTP,
 116 };
 117
 118 /* Define supported accessory type */
 119 enum rt8973a_muic_acc_type {
 120         RT8973A_MUIC_ADC_OTG = 0x0,
 121         RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
 122         RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
 123         RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
 124         RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
 125         RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
 126         RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
 127         RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
 128         RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
 129         RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
 130         RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
 131         RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
 132         RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
 133         RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
 134         RT8973A_MUIC_ADC_RESERVED_ACC_1,
 135         RT8973A_MUIC_ADC_RESERVED_ACC_2,
 136         RT8973A_MUIC_ADC_RESERVED_ACC_3,
 137         RT8973A_MUIC_ADC_RESERVED_ACC_4,
 138         RT8973A_MUIC_ADC_RESERVED_ACC_5,
 139         RT8973A_MUIC_ADC_AUDIO_TYPE2,
 140         RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
 141         RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
 142         RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
 143         RT8973A_MUIC_ADC_TA,
 144         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
 145         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
 146         RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
 147         RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
 148         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
 149         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
 150         RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
 151         RT8973A_MUIC_ADC_OPEN = 0x1f,
 152
 153         /* The below accessories has same ADC value (0x1f).
 154            So, Device type1 is used to separate specific accessory. */
 155                                         /* |---------|--ADC| */
 156                                         /* |    [7:5]|[4:0]| */
 157         RT8973A_MUIC_ADC_USB = 0x3f,    /* |      001|11111| */
 158 };
 159
 160 /* List of supported interrupt for RT8973A */
 161 static struct muic_irq rt8973a_muic_irqs[] = {
 162         { RT8973A_INT1_ATTACH,          "muic-attach" },
 163         { RT8973A_INT1_DETACH,          "muic-detach" },
 164         { RT8973A_INT1_CHGDET,          "muic-chgdet" },
 165         { RT8973A_INT1_DCD_T,           "muic-dcd-t" },
 166         { RT8973A_INT1_OVP,             "muic-ovp" },
 167         { RT8973A_INT1_CONNECT,         "muic-connect" },
 168         { RT8973A_INT1_ADC_CHG,         "muic-adc-chg" },
 169         { RT8973A_INT1_OTP,             "muic-otp" },
 170         { RT8973A_INT2_UVLO,            "muic-uvlo" },
 171         { RT8973A_INT2_POR,             "muic-por" },
 172         { RT8973A_INT2_OTP_FET,         "muic-otp-fet" },
 173         { RT8973A_INT2_OVP_FET,         "muic-ovp-fet" },
 174         { RT8973A_INT2_OCP_LATCH,       "muic-ocp-latch" },
 175         { RT8973A_INT2_OCP,             "muic-ocp" },
 176         { RT8973A_INT2_OVP_OCP,         "muic-ovp-ocp" },
 177 };
 178
 179 /* Define interrupt list of RT8973A to register regmap_irq */
 180 static const struct regmap_irq rt8973a_irqs[] = {
 181         /* INT1 interrupts */
 182         { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
 183         { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
 184         { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
 185         { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
 186         { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
 187         { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
 188         { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
 189         { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
 190
 191         /* INT2 interrupts */
 192         { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
 193         { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
 194         { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
 195         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
 196         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
 197         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
 198         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
 199 };
 200
 201 static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
 202         .name                   = "rt8973a",
 203         .status_base            = RT8973A_REG_INT1,
 204         .mask_base              = RT8973A_REG_INTM1,
 205         .mask_invert            = false,
 206         .num_regs               = 2,
 207         .irqs                   = rt8973a_irqs,
 208         .num_irqs               = ARRAY_SIZE(rt8973a_irqs),
 209 };
 210
 211 /* Define regmap configuration of RT8973A for I2C communication  */
 212 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
 213 {
 214         switch (reg) {
 215         case RT8973A_REG_INTM1:
 216         case RT8973A_REG_INTM2:
 217                 return true;
 218         default:
 219                 break;
 220         }
 221         return false;
 222 }
 223
 224 static const struct regmap_config rt8973a_muic_regmap_config = {
 225         .reg_bits       = 8,
 226         .val_bits       = 8,
 227         .volatile_reg   = rt8973a_muic_volatile_reg,
 228         .max_register   = RT8973A_REG_END,
 229 };
 230
 231 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
 232 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
 233                                 unsigned int con_sw, bool attached)
 234 {
 235         int ret;
 236
 237         /*
 238          * Don't need to set h/w path according to cable type
 239          * if Auto-configuration mode of CONTROL1 register is true.
 240          */
 241         if (info->auto_config)
 242                 return 0;
 243
 244         if (!attached)
 245                 con_sw  = DM_DP_SWITCH_UART;
 246
 247         switch (con_sw) {
 248         case DM_DP_SWITCH_OPEN:
 249         case DM_DP_SWITCH_USB:
 250         case DM_DP_SWITCH_UART:
 251                 ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
 252                                         RT8973A_REG_MANUAL_SW1_DP_MASK |
 253                                         RT8973A_REG_MANUAL_SW1_DM_MASK,
 254                                         con_sw);
 255                 if (ret < 0) {
 256                         dev_err(info->dev,
 257                                 "cannot update DM_CON/DP_CON switch\n");
 258                         return ret;
 259                 }
 260                 break;
 261         default:
 262                 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
 263                                 con_sw);
 264                 return -EINVAL;
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
 271 {
 272         unsigned int adc, dev1;
 273         int ret, cable_type;
 274
 275         /* Read ADC value according to external cable or button */
 276         ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
 277         if (ret) {
 278                 dev_err(info->dev, "failed to read ADC register\n");
 279                 return ret;
 280         }
 281         cable_type = adc & RT8973A_REG_ADC_MASK;
 282
 283         /* Read Device 1 reigster to identify correct cable type */
 284         ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
 285         if (ret) {
 286                 dev_err(info->dev, "failed to read DEV1 register\n");
 287                 return ret;
 288         }
 289
 290         switch (adc) {
 291         case RT8973A_MUIC_ADC_OPEN:
 292                 if (dev1 & RT8973A_REG_DEV1_USB_MASK)
 293                         cable_type = RT8973A_MUIC_ADC_USB;
 294                 else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
 295                         cable_type = RT8973A_MUIC_ADC_TA;
 296                 else
 297                         cable_type = RT8973A_MUIC_ADC_OPEN;
 298                 break;
 299         default:
 300                 break;
 301         }
 302
 303         return cable_type;
 304 }
 305
 306 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
 307                                         enum rt8973a_event_type event)
 308 {
 309         static unsigned int prev_cable_type;
 310         const char **cable_names = info->edev->supported_cable;
 311         unsigned int con_sw = DM_DP_SWITCH_UART;
 312         int ret, idx = 0, cable_type;
 313         bool attached = false;
 314
 315         if (!cable_names)
 316                 return 0;
 317
 318         switch (event) {
 319         case RT8973A_EVENT_ATTACH:
 320                 cable_type = rt8973a_muic_get_cable_type(info);
 321                 attached = true;
 322                 break;
 323         case RT8973A_EVENT_DETACH:
 324                 cable_type = prev_cable_type;
 325                 attached = false;
 326                 break;
 327         case RT8973A_EVENT_OVP:
 328         case RT8973A_EVENT_OTP:
 329                 dev_warn(info->dev,
 330                         "happen Over %s issue. Need to disconnect all cables\n",
 331                         event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
 332                 cable_type = prev_cable_type;
 333                 attached = false;
 334                 break;
 335         default:
 336                 dev_err(info->dev,
 337                         "Cannot handle this event (event:%d)\n", event);
 338                 return -EINVAL;
 339         }
 340         prev_cable_type = cable_type;
 341
 342         switch (cable_type) {
 343         case RT8973A_MUIC_ADC_OTG:
 344                 idx = EXTCON_CABLE_USB_HOST;
 345                 con_sw = DM_DP_SWITCH_USB;
 346                 break;
 347         case RT8973A_MUIC_ADC_TA:
 348                 idx = EXTCON_CABLE_TA;
 349                 con_sw = DM_DP_SWITCH_OPEN;
 350                 break;
 351         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
 352         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
 353                 idx = EXTCON_CABLE_JIG;
 354                 con_sw = DM_DP_SWITCH_USB;
 355                 break;
 356         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
 357         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
 358                 idx = EXTCON_CABLE_JIG;
 359                 con_sw = DM_DP_SWITCH_UART;
 360                 break;
 361         case RT8973A_MUIC_ADC_USB:
 362                 idx = EXTCON_CABLE_USB;
 363                 con_sw = DM_DP_SWITCH_USB;
 364                 break;
 365         case RT8973A_MUIC_ADC_OPEN:
 366                 return 0;
 367         case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
 368         case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
 369         case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
 370         case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
 371         case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
 372                 dev_warn(info->dev,
 373                         "Unknown accessory type (adc:0x%x)\n", cable_type);
 374                 return 0;
 375         case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
 376         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
 377         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
 378         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
 379         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
 380         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
 381         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
 382         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
 383         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
 384         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
 385         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
 386         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
 387         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
 388         case RT8973A_MUIC_ADC_AUDIO_TYPE2:
 389                 dev_warn(info->dev,
 390                         "Audio device/button type (adc:0x%x)\n", cable_type);
 391                 return 0;
 392         case RT8973A_MUIC_ADC_RESERVED_ACC_1:
 393         case RT8973A_MUIC_ADC_RESERVED_ACC_2:
 394         case RT8973A_MUIC_ADC_RESERVED_ACC_3:
 395         case RT8973A_MUIC_ADC_RESERVED_ACC_4:
 396         case RT8973A_MUIC_ADC_RESERVED_ACC_5:
 397         case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
 398                 return 0;
 399         default:
 400                 dev_err(info->dev,
 401                         "Cannot handle this cable_type (adc:0x%x)\n",
 402                         cable_type);
 403                 return -EINVAL;
 404         }
 405
 406         /* Change internal hardware path(DM_CON/DP_CON) */
 407         ret = rt8973a_muic_set_path(info, con_sw, attached);
 408         if (ret < 0)
 409                 return ret;
 410
 411         /* Change the state of external accessory */
 412         extcon_set_cable_state(info->edev, cable_names[idx], attached);
 413
 414         return 0;
 415 }
 416
 417 static void rt8973a_muic_irq_work(struct work_struct *work)
 418 {
 419         struct rt8973a_muic_info *info = container_of(work,
 420                         struct rt8973a_muic_info, irq_work);
 421         int ret = 0;
 422
 423         if (!info->edev)
 424                 return;
 425
 426         mutex_lock(&info->mutex);
 427
 428         /* Detect attached or detached cables */
 429         if (info->irq_attach) {
 430                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 431                 info->irq_attach = false;
 432         }
 433
 434         if (info->irq_detach) {
 435                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
 436                 info->irq_detach = false;
 437         }
 438
 439         if (info->irq_ovp) {
 440                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
 441                 info->irq_ovp = false;
 442         }
 443
 444         if (info->irq_otp) {
 445                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
 446                 info->irq_otp = false;
 447         }
 448
 449         if (ret < 0)
 450                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 451
 452         mutex_unlock(&info->mutex);
 453 }
 454
 455 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
 456 {
 457         struct rt8973a_muic_info *info = data;
 458         int i, irq_type = -1;
 459
 460         for (i = 0; i < info->num_muic_irqs; i++)
 461                 if (irq == info->muic_irqs[i].virq)
 462                         irq_type = info->muic_irqs[i].irq;
 463
 464         switch (irq_type) {
 465         case RT8973A_INT1_ATTACH:
 466                 info->irq_attach = true;
 467                 break;
 468         case RT8973A_INT1_DETACH:
 469                 info->irq_detach = true;
 470                 break;
 471         case RT8973A_INT1_OVP:
 472                 info->irq_ovp = true;
 473                 break;
 474         case RT8973A_INT1_OTP:
 475                 info->irq_otp = true;
 476                 break;
 477         case RT8973A_INT1_CHGDET:
 478         case RT8973A_INT1_DCD_T:
 479         case RT8973A_INT1_CONNECT:
 480         case RT8973A_INT1_ADC_CHG:
 481         case RT8973A_INT2_UVLO:
 482         case RT8973A_INT2_POR:
 483         case RT8973A_INT2_OTP_FET:
 484         case RT8973A_INT2_OVP_FET:
 485         case RT8973A_INT2_OCP_LATCH:
 486         case RT8973A_INT2_OCP:
 487         case RT8973A_INT2_OVP_OCP:
 488         default:
 489                 dev_dbg(info->dev,
 490                         "Cannot handle this interrupt (%d)\n", irq_type);
 491                 break;
 492         }
 493
 494         schedule_work(&info->irq_work);
 495
 496         return IRQ_HANDLED;
 497 }
 498
 499 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
 500 {
 501         struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
 502                                 struct rt8973a_muic_info, wq_detcable);
 503         int ret;
 504
 505         /* Notify the state of connector cable or not  */
 506         ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 507         if (ret < 0)
 508                 dev_warn(info->dev, "failed to detect cable state\n");
 509 }
 510
 511 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
 512 {
 513         unsigned int data, vendor_id, version_id;
 514         int i, ret;
 515
 516         /* To test I2C, Print version_id and vendor_id of RT8973A */
 517         ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
 518         if (ret) {
 519                 dev_err(info->dev,
 520                         "failed to read DEVICE_ID register: %d\n", ret);
 521                 return;
 522         }
 523
 524         vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
 525                                 RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
 526         version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
 527                                 RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
 528
 529         dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 530                             version_id, vendor_id);
 531
 532         /* Initiazle the register of RT8973A device to bring-up */
 533         for (i = 0; i < info->num_reg_data; i++) {
 534                 u8 reg = info->reg_data[i].reg;
 535                 u8 mask = info->reg_data[i].mask;
 536                 u8 val = 0;
 537
 538                 if (info->reg_data[i].invert)
 539                         val = ~info->reg_data[i].val;
 540                 else
 541                         val = info->reg_data[i].val;
 542
 543                 regmap_update_bits(info->regmap, reg, mask, val);
 544         }
 545
 546         /* Check whether RT8973A is auto swithcing mode or not */
 547         ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
 548         if (ret) {
 549                 dev_err(info->dev,
 550                         "failed to read CONTROL1 register: %d\n", ret);
 551                 return;
 552         }
 553
 554         data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
 555         if (data) {
 556                 info->auto_config = true;
 557                 dev_info(info->dev,
 558                         "Enable Auto-configuration for internal path\n");
 559         }
 560 }
 561
 562 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
 563                                  const struct i2c_device_id *id)
 564 {
 565         struct device_node *np = i2c->dev.of_node;
 566         struct rt8973a_muic_info *info;
 567         int i, ret, irq_flags;
 568
 569         if (!np)
 570                 return -EINVAL;
 571
 572         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 573         if (!info)
 574                 return -ENOMEM;
 575         i2c_set_clientdata(i2c, info);
 576
 577         info->dev = &i2c->dev;
 578         info->i2c = i2c;
 579         info->irq = i2c->irq;
 580         info->muic_irqs = rt8973a_muic_irqs;
 581         info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
 582         info->reg_data = rt8973a_reg_data;
 583         info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
 584
 585         mutex_init(&info->mutex);
 586
 587         INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
 588
 589         info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
 590         if (IS_ERR(info->regmap)) {
 591                 ret = PTR_ERR(info->regmap);
 592                 dev_err(info->dev, "failed to allocate register map: %d\n",
 593                                    ret);
 594                 return ret;
 595         }
 596
 597         /* Support irq domain for RT8973A MUIC device */
 598         irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 599         ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
 600                                   &rt8973a_muic_irq_chip, &info->irq_data);
 601         if (ret != 0) {
 602                 dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
 603                                     info->irq, ret);
 604                 return ret;
 605         }
 606
 607         for (i = 0; i < info->num_muic_irqs; i++) {
 608                 struct muic_irq *muic_irq = &info->muic_irqs[i];
 609                 unsigned int virq = 0;
 610
 611                 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
 612                 if (virq <= 0)
 613                         return -EINVAL;
 614                 muic_irq->virq = virq;
 615
 616                 ret = devm_request_threaded_irq(info->dev, virq, NULL,
 617                                                 rt8973a_muic_irq_handler,
 618                                                 IRQF_NO_SUSPEND,
 619                                                 muic_irq->name, info);
 620                 if (ret) {
 621                         dev_err(info->dev,
 622                                 "failed: irq request (IRQ: %d, error :%d)\n",
 623                                 muic_irq->irq, ret);
 624                         return ret;
 625                 }
 626         }
 627
 628         /* Allocate extcon device */
 629         info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
 630         if (IS_ERR(info->edev)) {
 631                 dev_err(info->dev, "failed to allocate memory for extcon\n");
 632                 return -ENOMEM;
 633         }
 634
 635         /* Register extcon device */
 636         ret = devm_extcon_dev_register(info->dev, info->edev);
 637         if (ret) {
 638                 dev_err(info->dev, "failed to register extcon device\n");
 639                 return ret;
 640         }
 641
 642         /*
 643          * Detect accessory after completing the initialization of platform
 644          *
 645          * - Use delayed workqueue to detect cable state and then
 646          * notify cable state to notifiee/platform through uevent.
 647          * After completing the booting of platform, the extcon provider
 648          * driver should notify cable state to upper layer.
 649          */
 650         INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
 651         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 652                         msecs_to_jiffies(DELAY_MS_DEFAULT));
 653
 654         /* Initialize RT8973A device and print vendor id and version id */
 655         rt8973a_init_dev_type(info);
 656
 657         return 0;
 658 }
 659
 660 static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
 661 {
 662         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 663
 664         regmap_del_irq_chip(info->irq, info->irq_data);
 665
 666         return 0;
 667 }
 668
 669 static const struct of_device_id rt8973a_dt_match[] = {
 670         { .compatible = "richtek,rt8973a-muic" },
 671         { },
 672 };
 673
 674 #ifdef CONFIG_PM_SLEEP
 675 static int rt8973a_muic_suspend(struct device *dev)
 676 {
 677         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 678         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 679
 680         enable_irq_wake(info->irq);
 681
 682         return 0;
 683 }
 684
 685 static int rt8973a_muic_resume(struct device *dev)
 686 {
 687         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 688         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 689
 690         disable_irq_wake(info->irq);
 691
 692         return 0;
 693 }
 694 #endif
 695
 696 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
 697                          rt8973a_muic_suspend, rt8973a_muic_resume);
 698
 699 static const struct i2c_device_id rt8973a_i2c_id[] = {
 700         { "rt8973a", TYPE_RT8973A },
 701         { }
 702 };
 703 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
 704
 705 static struct i2c_driver rt8973a_muic_i2c_driver = {
 706         .driver         = {
 707                 .name   = "rt8973a",
 708                 .owner  = THIS_MODULE,
 709                 .pm     = &rt8973a_muic_pm_ops,
 710                 .of_match_table = rt8973a_dt_match,
 711         },
 712         .probe  = rt8973a_muic_i2c_probe,
 713         .remove = rt8973a_muic_i2c_remove,
 714         .id_table = rt8973a_i2c_id,
 715 };
 716
 717 static int __init rt8973a_muic_i2c_init(void)
 718 {
 719         return i2c_add_driver(&rt8973a_muic_i2c_driver);
 720 }
 721 subsys_initcall(rt8973a_muic_i2c_init);
 722
 723 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
 724 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 725 MODULE_LICENSE("GPL");