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 static const unsigned int rt8973a_extcon_cable[] = {
  94         EXTCON_USB,
  95         EXTCON_USB_HOST,
  96         EXTCON_CHG_USB_SDP,
  97         EXTCON_CHG_USB_DCP,
  98         EXTCON_JIG,
  99         EXTCON_NONE,
 100 };
 101
 102 /* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
 103 enum rt8973a_event_type {
 104         RT8973A_EVENT_ATTACH = 1,
 105         RT8973A_EVENT_DETACH,
 106         RT8973A_EVENT_OVP,
 107         RT8973A_EVENT_OTP,
 108 };
 109
 110 /* Define supported accessory type */
 111 enum rt8973a_muic_acc_type {
 112         RT8973A_MUIC_ADC_OTG = 0x0,
 113         RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
 114         RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
 115         RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
 116         RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
 117         RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
 118         RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
 119         RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
 120         RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
 121         RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
 122         RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
 123         RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
 124         RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
 125         RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
 126         RT8973A_MUIC_ADC_RESERVED_ACC_1,
 127         RT8973A_MUIC_ADC_RESERVED_ACC_2,
 128         RT8973A_MUIC_ADC_RESERVED_ACC_3,
 129         RT8973A_MUIC_ADC_RESERVED_ACC_4,
 130         RT8973A_MUIC_ADC_RESERVED_ACC_5,
 131         RT8973A_MUIC_ADC_AUDIO_TYPE2,
 132         RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
 133         RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
 134         RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
 135         RT8973A_MUIC_ADC_TA,
 136         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
 137         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
 138         RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
 139         RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
 140         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
 141         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
 142         RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
 143         RT8973A_MUIC_ADC_OPEN = 0x1f,
 144
 145         /* The below accessories has same ADC value (0x1f).
 146            So, Device type1 is used to separate specific accessory. */
 147                                         /* |---------|--ADC| */
 148                                         /* |    [7:5]|[4:0]| */
 149         RT8973A_MUIC_ADC_USB = 0x3f,    /* |      001|11111| */
 150 };
 151
 152 /* List of supported interrupt for RT8973A */
 153 static struct muic_irq rt8973a_muic_irqs[] = {
 154         { RT8973A_INT1_ATTACH,          "muic-attach" },
 155         { RT8973A_INT1_DETACH,          "muic-detach" },
 156         { RT8973A_INT1_CHGDET,          "muic-chgdet" },
 157         { RT8973A_INT1_DCD_T,           "muic-dcd-t" },
 158         { RT8973A_INT1_OVP,             "muic-ovp" },
 159         { RT8973A_INT1_CONNECT,         "muic-connect" },
 160         { RT8973A_INT1_ADC_CHG,         "muic-adc-chg" },
 161         { RT8973A_INT1_OTP,             "muic-otp" },
 162         { RT8973A_INT2_UVLO,            "muic-uvlo" },
 163         { RT8973A_INT2_POR,             "muic-por" },
 164         { RT8973A_INT2_OTP_FET,         "muic-otp-fet" },
 165         { RT8973A_INT2_OVP_FET,         "muic-ovp-fet" },
 166         { RT8973A_INT2_OCP_LATCH,       "muic-ocp-latch" },
 167         { RT8973A_INT2_OCP,             "muic-ocp" },
 168         { RT8973A_INT2_OVP_OCP,         "muic-ovp-ocp" },
 169 };
 170
 171 /* Define interrupt list of RT8973A to register regmap_irq */
 172 static const struct regmap_irq rt8973a_irqs[] = {
 173         /* INT1 interrupts */
 174         { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
 175         { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
 176         { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
 177         { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
 178         { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
 179         { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
 180         { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
 181         { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
 182
 183         /* INT2 interrupts */
 184         { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
 185         { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
 186         { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
 187         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
 188         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
 189         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
 190         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
 191 };
 192
 193 static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
 194         .name                   = "rt8973a",
 195         .status_base            = RT8973A_REG_INT1,
 196         .mask_base              = RT8973A_REG_INTM1,
 197         .mask_invert            = false,
 198         .num_regs               = 2,
 199         .irqs                   = rt8973a_irqs,
 200         .num_irqs               = ARRAY_SIZE(rt8973a_irqs),
 201 };
 202
 203 /* Define regmap configuration of RT8973A for I2C communication  */
 204 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
 205 {
 206         switch (reg) {
 207         case RT8973A_REG_INTM1:
 208         case RT8973A_REG_INTM2:
 209                 return true;
 210         default:
 211                 break;
 212         }
 213         return false;
 214 }
 215
 216 static const struct regmap_config rt8973a_muic_regmap_config = {
 217         .reg_bits       = 8,
 218         .val_bits       = 8,
 219         .volatile_reg   = rt8973a_muic_volatile_reg,
 220         .max_register   = RT8973A_REG_END,
 221 };
 222
 223 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
 224 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
 225                                 unsigned int con_sw, bool attached)
 226 {
 227         int ret;
 228
 229         /*
 230          * Don't need to set h/w path according to cable type
 231          * if Auto-configuration mode of CONTROL1 register is true.
 232          */
 233         if (info->auto_config)
 234                 return 0;
 235
 236         if (!attached)
 237                 con_sw  = DM_DP_SWITCH_UART;
 238
 239         switch (con_sw) {
 240         case DM_DP_SWITCH_OPEN:
 241         case DM_DP_SWITCH_USB:
 242         case DM_DP_SWITCH_UART:
 243                 ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
 244                                         RT8973A_REG_MANUAL_SW1_DP_MASK |
 245                                         RT8973A_REG_MANUAL_SW1_DM_MASK,
 246                                         con_sw);
 247                 if (ret < 0) {
 248                         dev_err(info->dev,
 249                                 "cannot update DM_CON/DP_CON switch\n");
 250                         return ret;
 251                 }
 252                 break;
 253         default:
 254                 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
 255                                 con_sw);
 256                 return -EINVAL;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
 263 {
 264         unsigned int adc, dev1;
 265         int ret, cable_type;
 266
 267         /* Read ADC value according to external cable or button */
 268         ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
 269         if (ret) {
 270                 dev_err(info->dev, "failed to read ADC register\n");
 271                 return ret;
 272         }
 273         cable_type = adc & RT8973A_REG_ADC_MASK;
 274
 275         /* Read Device 1 reigster to identify correct cable type */
 276         ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
 277         if (ret) {
 278                 dev_err(info->dev, "failed to read DEV1 register\n");
 279                 return ret;
 280         }
 281
 282         switch (adc) {
 283         case RT8973A_MUIC_ADC_OPEN:
 284                 if (dev1 & RT8973A_REG_DEV1_USB_MASK)
 285                         cable_type = RT8973A_MUIC_ADC_USB;
 286                 else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
 287                         cable_type = RT8973A_MUIC_ADC_TA;
 288                 else
 289                         cable_type = RT8973A_MUIC_ADC_OPEN;
 290                 break;
 291         default:
 292                 break;
 293         }
 294
 295         return cable_type;
 296 }
 297
 298 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
 299                                         enum rt8973a_event_type event)
 300 {
 301         static unsigned int prev_cable_type;
 302         unsigned int con_sw = DM_DP_SWITCH_UART;
 303         int ret, cable_type;
 304         unsigned int id;
 305         bool attached = false;
 306
 307         switch (event) {
 308         case RT8973A_EVENT_ATTACH:
 309                 cable_type = rt8973a_muic_get_cable_type(info);
 310                 attached = true;
 311                 break;
 312         case RT8973A_EVENT_DETACH:
 313                 cable_type = prev_cable_type;
 314                 attached = false;
 315                 break;
 316         case RT8973A_EVENT_OVP:
 317         case RT8973A_EVENT_OTP:
 318                 dev_warn(info->dev,
 319                         "happen Over %s issue. Need to disconnect all cables\n",
 320                         event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
 321                 cable_type = prev_cable_type;
 322                 attached = false;
 323                 break;
 324         default:
 325                 dev_err(info->dev,
 326                         "Cannot handle this event (event:%d)\n", event);
 327                 return -EINVAL;
 328         }
 329         prev_cable_type = cable_type;
 330
 331         switch (cable_type) {
 332         case RT8973A_MUIC_ADC_OTG:
 333                 id = EXTCON_USB_HOST;
 334                 con_sw = DM_DP_SWITCH_USB;
 335                 break;
 336         case RT8973A_MUIC_ADC_TA:
 337                 id = EXTCON_CHG_USB_DCP;
 338                 con_sw = DM_DP_SWITCH_OPEN;
 339                 break;
 340         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
 341         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
 342                 id = EXTCON_JIG;
 343                 con_sw = DM_DP_SWITCH_USB;
 344                 break;
 345         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
 346         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
 347                 id = EXTCON_JIG;
 348                 con_sw = DM_DP_SWITCH_UART;
 349                 break;
 350         case RT8973A_MUIC_ADC_USB:
 351                 id = EXTCON_USB;
 352                 con_sw = DM_DP_SWITCH_USB;
 353                 break;
 354         case RT8973A_MUIC_ADC_OPEN:
 355                 return 0;
 356         case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
 357         case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
 358         case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
 359         case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
 360         case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
 361                 dev_warn(info->dev,
 362                         "Unknown accessory type (adc:0x%x)\n", cable_type);
 363                 return 0;
 364         case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
 365         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
 366         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
 367         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
 368         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
 369         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
 370         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
 371         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
 372         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
 373         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
 374         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
 375         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
 376         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
 377         case RT8973A_MUIC_ADC_AUDIO_TYPE2:
 378                 dev_warn(info->dev,
 379                         "Audio device/button type (adc:0x%x)\n", cable_type);
 380                 return 0;
 381         case RT8973A_MUIC_ADC_RESERVED_ACC_1:
 382         case RT8973A_MUIC_ADC_RESERVED_ACC_2:
 383         case RT8973A_MUIC_ADC_RESERVED_ACC_3:
 384         case RT8973A_MUIC_ADC_RESERVED_ACC_4:
 385         case RT8973A_MUIC_ADC_RESERVED_ACC_5:
 386         case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
 387                 return 0;
 388         default:
 389                 dev_err(info->dev,
 390                         "Cannot handle this cable_type (adc:0x%x)\n",
 391                         cable_type);
 392                 return -EINVAL;
 393         }
 394
 395         /* Change internal hardware path(DM_CON/DP_CON) */
 396         ret = rt8973a_muic_set_path(info, con_sw, attached);
 397         if (ret < 0)
 398                 return ret;
 399
 400         /* Change the state of external accessory */
 401         extcon_set_state_sync(info->edev, id, attached);
 402         if (id == EXTCON_USB)
 403                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 404                                         attached);
 405
 406         return 0;
 407 }
 408
 409 static void rt8973a_muic_irq_work(struct work_struct *work)
 410 {
 411         struct rt8973a_muic_info *info = container_of(work,
 412                         struct rt8973a_muic_info, irq_work);
 413         int ret = 0;
 414
 415         if (!info->edev)
 416                 return;
 417
 418         mutex_lock(&info->mutex);
 419
 420         /* Detect attached or detached cables */
 421         if (info->irq_attach) {
 422                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 423                 info->irq_attach = false;
 424         }
 425
 426         if (info->irq_detach) {
 427                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
 428                 info->irq_detach = false;
 429         }
 430
 431         if (info->irq_ovp) {
 432                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
 433                 info->irq_ovp = false;
 434         }
 435
 436         if (info->irq_otp) {
 437                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
 438                 info->irq_otp = false;
 439         }
 440
 441         if (ret < 0)
 442                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 443
 444         mutex_unlock(&info->mutex);
 445 }
 446
 447 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
 448 {
 449         struct rt8973a_muic_info *info = data;
 450         int i, irq_type = -1;
 451
 452         for (i = 0; i < info->num_muic_irqs; i++)
 453                 if (irq == info->muic_irqs[i].virq)
 454                         irq_type = info->muic_irqs[i].irq;
 455
 456         switch (irq_type) {
 457         case RT8973A_INT1_ATTACH:
 458                 info->irq_attach = true;
 459                 break;
 460         case RT8973A_INT1_DETACH:
 461                 info->irq_detach = true;
 462                 break;
 463         case RT8973A_INT1_OVP:
 464                 info->irq_ovp = true;
 465                 break;
 466         case RT8973A_INT1_OTP:
 467                 info->irq_otp = true;
 468                 break;
 469         case RT8973A_INT1_CHGDET:
 470         case RT8973A_INT1_DCD_T:
 471         case RT8973A_INT1_CONNECT:
 472         case RT8973A_INT1_ADC_CHG:
 473         case RT8973A_INT2_UVLO:
 474         case RT8973A_INT2_POR:
 475         case RT8973A_INT2_OTP_FET:
 476         case RT8973A_INT2_OVP_FET:
 477         case RT8973A_INT2_OCP_LATCH:
 478         case RT8973A_INT2_OCP:
 479         case RT8973A_INT2_OVP_OCP:
 480         default:
 481                 dev_dbg(info->dev,
 482                         "Cannot handle this interrupt (%d)\n", irq_type);
 483                 break;
 484         }
 485
 486         schedule_work(&info->irq_work);
 487
 488         return IRQ_HANDLED;
 489 }
 490
 491 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
 492 {
 493         struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
 494                                 struct rt8973a_muic_info, wq_detcable);
 495         int ret;
 496
 497         /* Notify the state of connector cable or not  */
 498         ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 499         if (ret < 0)
 500                 dev_warn(info->dev, "failed to detect cable state\n");
 501 }
 502
 503 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
 504 {
 505         unsigned int data, vendor_id, version_id;
 506         int i, ret;
 507
 508         /* To test I2C, Print version_id and vendor_id of RT8973A */
 509         ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
 510         if (ret) {
 511                 dev_err(info->dev,
 512                         "failed to read DEVICE_ID register: %d\n", ret);
 513                 return;
 514         }
 515
 516         vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
 517                                 RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
 518         version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
 519                                 RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
 520
 521         dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 522                             version_id, vendor_id);
 523
 524         /* Initiazle the register of RT8973A device to bring-up */
 525         for (i = 0; i < info->num_reg_data; i++) {
 526                 u8 reg = info->reg_data[i].reg;
 527                 u8 mask = info->reg_data[i].mask;
 528                 u8 val = 0;
 529
 530                 if (info->reg_data[i].invert)
 531                         val = ~info->reg_data[i].val;
 532                 else
 533                         val = info->reg_data[i].val;
 534
 535                 regmap_update_bits(info->regmap, reg, mask, val);
 536         }
 537
 538         /* Check whether RT8973A is auto swithcing mode or not */
 539         ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
 540         if (ret) {
 541                 dev_err(info->dev,
 542                         "failed to read CONTROL1 register: %d\n", ret);
 543                 return;
 544         }
 545
 546         data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
 547         if (data) {
 548                 info->auto_config = true;
 549                 dev_info(info->dev,
 550                         "Enable Auto-configuration for internal path\n");
 551         }
 552 }
 553
 554 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
 555                                  const struct i2c_device_id *id)
 556 {
 557         struct device_node *np = i2c->dev.of_node;
 558         struct rt8973a_muic_info *info;
 559         int i, ret, irq_flags;
 560
 561         if (!np)
 562                 return -EINVAL;
 563
 564         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 565         if (!info)
 566                 return -ENOMEM;
 567         i2c_set_clientdata(i2c, info);
 568
 569         info->dev = &i2c->dev;
 570         info->i2c = i2c;
 571         info->irq = i2c->irq;
 572         info->muic_irqs = rt8973a_muic_irqs;
 573         info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
 574         info->reg_data = rt8973a_reg_data;
 575         info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
 576
 577         mutex_init(&info->mutex);
 578
 579         INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
 580
 581         info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
 582         if (IS_ERR(info->regmap)) {
 583                 ret = PTR_ERR(info->regmap);
 584                 dev_err(info->dev, "failed to allocate register map: %d\n",
 585                                    ret);
 586                 return ret;
 587         }
 588
 589         /* Support irq domain for RT8973A MUIC device */
 590         irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 591         ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
 592                                   &rt8973a_muic_irq_chip, &info->irq_data);
 593         if (ret != 0) {
 594                 dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
 595                                     info->irq, ret);
 596                 return ret;
 597         }
 598
 599         for (i = 0; i < info->num_muic_irqs; i++) {
 600                 struct muic_irq *muic_irq = &info->muic_irqs[i];
 601                 int virq = 0;
 602
 603                 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
 604                 if (virq <= 0)
 605                         return -EINVAL;
 606                 muic_irq->virq = virq;
 607
 608                 ret = devm_request_threaded_irq(info->dev, virq, NULL,
 609                                                 rt8973a_muic_irq_handler,
 610                                                 IRQF_NO_SUSPEND | IRQF_ONESHOT,
 611                                                 muic_irq->name, info);
 612                 if (ret) {
 613                         dev_err(info->dev,
 614                                 "failed: irq request (IRQ: %d, error :%d)\n",
 615                                 muic_irq->irq, ret);
 616                         return ret;
 617                 }
 618         }
 619
 620         /* Allocate extcon device */
 621         info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
 622         if (IS_ERR(info->edev)) {
 623                 dev_err(info->dev, "failed to allocate memory for extcon\n");
 624                 return -ENOMEM;
 625         }
 626
 627         /* Register extcon device */
 628         ret = devm_extcon_dev_register(info->dev, info->edev);
 629         if (ret) {
 630                 dev_err(info->dev, "failed to register extcon device\n");
 631                 return ret;
 632         }
 633
 634         /*
 635          * Detect accessory after completing the initialization of platform
 636          *
 637          * - Use delayed workqueue to detect cable state and then
 638          * notify cable state to notifiee/platform through uevent.
 639          * After completing the booting of platform, the extcon provider
 640          * driver should notify cable state to upper layer.
 641          */
 642         INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
 643         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 644                         msecs_to_jiffies(DELAY_MS_DEFAULT));
 645
 646         /* Initialize RT8973A device and print vendor id and version id */
 647         rt8973a_init_dev_type(info);
 648
 649         return 0;
 650 }
 651
 652 static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
 653 {
 654         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 655
 656         regmap_del_irq_chip(info->irq, info->irq_data);
 657
 658         return 0;
 659 }
 660
 661 static const struct of_device_id rt8973a_dt_match[] = {
 662         { .compatible = "richtek,rt8973a-muic" },
 663         { },
 664 };
 665 MODULE_DEVICE_TABLE(of, rt8973a_dt_match);
 666
 667 #ifdef CONFIG_PM_SLEEP
 668 static int rt8973a_muic_suspend(struct device *dev)
 669 {
 670         struct i2c_client *i2c = to_i2c_client(dev);
 671         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 672
 673         enable_irq_wake(info->irq);
 674
 675         return 0;
 676 }
 677
 678 static int rt8973a_muic_resume(struct device *dev)
 679 {
 680         struct i2c_client *i2c = to_i2c_client(dev);
 681         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 682
 683         disable_irq_wake(info->irq);
 684
 685         return 0;
 686 }
 687 #endif
 688
 689 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
 690                          rt8973a_muic_suspend, rt8973a_muic_resume);
 691
 692 static const struct i2c_device_id rt8973a_i2c_id[] = {
 693         { "rt8973a", TYPE_RT8973A },
 694         { }
 695 };
 696 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
 697
 698 static struct i2c_driver rt8973a_muic_i2c_driver = {
 699         .driver         = {
 700                 .name   = "rt8973a",
 701                 .pm     = &rt8973a_muic_pm_ops,
 702                 .of_match_table = rt8973a_dt_match,
 703         },
 704         .probe  = rt8973a_muic_i2c_probe,
 705         .remove = rt8973a_muic_i2c_remove,
 706         .id_table = rt8973a_i2c_id,
 707 };
 708
 709 static int __init rt8973a_muic_i2c_init(void)
 710 {
 711         return i2c_add_driver(&rt8973a_muic_i2c_driver);
 712 }
 713 subsys_initcall(rt8973a_muic_i2c_init);
 714
 715 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
 716 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 717 MODULE_LICENSE("GPL");