drivers/extcon/extcon-rt8973a.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches
   4  *
   5  * Copyright (c) 2014 Samsung Electronics Co., Ltd
   6  * Author: Chanwoo Choi <cw00.choi@samsung.com>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/i2c.h>
  11 #include <linux/input.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/irqdomain.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/slab.h>
  19 #include <linux/extcon-provider.h>
  20
  21 #include "extcon-rt8973a.h"
  22
  23 #define DELAY_MS_DEFAULT                20000   /* unit: millisecond */
  24
  25 struct muic_irq {
  26         unsigned int irq;
  27         const char *name;
  28         unsigned int virq;
  29 };
  30
  31 struct reg_data {
  32         u8 reg;
  33         u8 mask;
  34         u8 val;
  35         bool invert;
  36 };
  37
  38 struct rt8973a_muic_info {
  39         struct device *dev;
  40         struct extcon_dev *edev;
  41
  42         struct i2c_client *i2c;
  43         struct regmap *regmap;
  44
  45         struct regmap_irq_chip_data *irq_data;
  46         struct muic_irq *muic_irqs;
  47         unsigned int num_muic_irqs;
  48         int irq;
  49         bool irq_attach;
  50         bool irq_detach;
  51         bool irq_ovp;
  52         bool irq_otp;
  53         struct work_struct irq_work;
  54
  55         struct reg_data *reg_data;
  56         unsigned int num_reg_data;
  57         bool auto_config;
  58
  59         struct mutex mutex;
  60
  61         /*
  62          * Use delayed workqueue to detect cable state and then
  63          * notify cable state to notifiee/platform through uevent.
  64          * After completing the booting of platform, the extcon provider
  65          * driver should notify cable state to upper layer.
  66          */
  67         struct delayed_work wq_detcable;
  68 };
  69
  70 /* Default value of RT8973A register to bring up MUIC device. */
  71 static struct reg_data rt8973a_reg_data[] = {
  72         {
  73                 .reg = RT8973A_REG_CONTROL1,
  74                 .mask = RT8973A_REG_CONTROL1_ADC_EN_MASK
  75                         | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
  76                         | RT8973A_REG_CONTROL1_CHGTYP_MASK
  77                         | RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK
  78                         | RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK
  79                         | RT8973A_REG_CONTROL1_INTM_MASK,
  80                 .val = RT8973A_REG_CONTROL1_ADC_EN_MASK
  81                         | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
  82                         | RT8973A_REG_CONTROL1_CHGTYP_MASK,
  83                 .invert = false,
  84         },
  85         { /* sentinel */ }
  86 };
  87
  88 /* List of detectable cables */
  89 static const unsigned int rt8973a_extcon_cable[] = {
  90         EXTCON_USB,
  91         EXTCON_USB_HOST,
  92         EXTCON_CHG_USB_SDP,
  93         EXTCON_CHG_USB_DCP,
  94         EXTCON_JIG,
  95         EXTCON_NONE,
  96 };
  97
  98 /* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
  99 enum rt8973a_event_type {
 100         RT8973A_EVENT_ATTACH = 1,
 101         RT8973A_EVENT_DETACH,
 102         RT8973A_EVENT_OVP,
 103         RT8973A_EVENT_OTP,
 104 };
 105
 106 /* Define supported accessory type */
 107 enum rt8973a_muic_acc_type {
 108         RT8973A_MUIC_ADC_OTG = 0x0,
 109         RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
 110         RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
 111         RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
 112         RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
 113         RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
 114         RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
 115         RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
 116         RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
 117         RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
 118         RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
 119         RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
 120         RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
 121         RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
 122         RT8973A_MUIC_ADC_RESERVED_ACC_1,
 123         RT8973A_MUIC_ADC_RESERVED_ACC_2,
 124         RT8973A_MUIC_ADC_RESERVED_ACC_3,
 125         RT8973A_MUIC_ADC_RESERVED_ACC_4,
 126         RT8973A_MUIC_ADC_RESERVED_ACC_5,
 127         RT8973A_MUIC_ADC_AUDIO_TYPE2,
 128         RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
 129         RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
 130         RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
 131         RT8973A_MUIC_ADC_TA,
 132         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
 133         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
 134         RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
 135         RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
 136         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
 137         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
 138         RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
 139         RT8973A_MUIC_ADC_OPEN = 0x1f,
 140
 141         /*
 142          * The below accessories has same ADC value (0x1f).
 143          * So, Device type1 is used to separate specific accessory.
 144          */
 145                                         /* |---------|--ADC| */
 146                                         /* |    [7:5]|[4:0]| */
 147         RT8973A_MUIC_ADC_USB = 0x3f,    /* |      001|11111| */
 148 };
 149
 150 /* List of supported interrupt for RT8973A */
 151 static struct muic_irq rt8973a_muic_irqs[] = {
 152         { RT8973A_INT1_ATTACH,          "muic-attach" },
 153         { RT8973A_INT1_DETACH,          "muic-detach" },
 154         { RT8973A_INT1_CHGDET,          "muic-chgdet" },
 155         { RT8973A_INT1_DCD_T,           "muic-dcd-t" },
 156         { RT8973A_INT1_OVP,             "muic-ovp" },
 157         { RT8973A_INT1_CONNECT,         "muic-connect" },
 158         { RT8973A_INT1_ADC_CHG,         "muic-adc-chg" },
 159         { RT8973A_INT1_OTP,             "muic-otp" },
 160         { RT8973A_INT2_UVLO,            "muic-uvlo" },
 161         { RT8973A_INT2_POR,             "muic-por" },
 162         { RT8973A_INT2_OTP_FET,         "muic-otp-fet" },
 163         { RT8973A_INT2_OVP_FET,         "muic-ovp-fet" },
 164         { RT8973A_INT2_OCP_LATCH,       "muic-ocp-latch" },
 165         { RT8973A_INT2_OCP,             "muic-ocp" },
 166         { RT8973A_INT2_OVP_OCP,         "muic-ovp-ocp" },
 167 };
 168
 169 /* Define interrupt list of RT8973A to register regmap_irq */
 170 static const struct regmap_irq rt8973a_irqs[] = {
 171         /* INT1 interrupts */
 172         { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
 173         { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
 174         { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
 175         { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
 176         { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
 177         { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
 178         { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
 179         { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
 180
 181         /* INT2 interrupts */
 182         { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
 183         { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
 184         { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
 185         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
 186         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
 187         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
 188         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
 189 };
 190
 191 static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
 192         .name                   = "rt8973a",
 193         .status_base            = RT8973A_REG_INT1,
 194         .mask_base              = RT8973A_REG_INTM1,
 195         .mask_invert            = false,
 196         .num_regs               = 2,
 197         .irqs                   = rt8973a_irqs,
 198         .num_irqs               = ARRAY_SIZE(rt8973a_irqs),
 199 };
 200
 201 /* Define regmap configuration of RT8973A for I2C communication  */
 202 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
 203 {
 204         switch (reg) {
 205         case RT8973A_REG_INTM1:
 206         case RT8973A_REG_INTM2:
 207                 return true;
 208         default:
 209                 break;
 210         }
 211         return false;
 212 }
 213
 214 static const struct regmap_config rt8973a_muic_regmap_config = {
 215         .reg_bits       = 8,
 216         .val_bits       = 8,
 217         .volatile_reg   = rt8973a_muic_volatile_reg,
 218         .max_register   = RT8973A_REG_END,
 219 };
 220
 221 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
 222 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
 223                                 unsigned int con_sw, bool attached)
 224 {
 225         int ret;
 226
 227         /*
 228          * Don't need to set h/w path according to cable type
 229          * if Auto-configuration mode of CONTROL1 register is true.
 230          */
 231         if (info->auto_config)
 232                 return 0;
 233
 234         if (!attached)
 235                 con_sw  = DM_DP_SWITCH_UART;
 236
 237         switch (con_sw) {
 238         case DM_DP_SWITCH_OPEN:
 239         case DM_DP_SWITCH_USB:
 240         case DM_DP_SWITCH_UART:
 241                 ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
 242                                         RT8973A_REG_MANUAL_SW1_DP_MASK |
 243                                         RT8973A_REG_MANUAL_SW1_DM_MASK,
 244                                         con_sw);
 245                 if (ret < 0) {
 246                         dev_err(info->dev,
 247                                 "cannot update DM_CON/DP_CON switch\n");
 248                         return ret;
 249                 }
 250                 break;
 251         default:
 252                 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
 253                                 con_sw);
 254                 return -EINVAL;
 255         }
 256
 257         return 0;
 258 }
 259
 260 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
 261 {
 262         unsigned int adc, dev1;
 263         int ret, cable_type;
 264
 265         /* Read ADC value according to external cable or button */
 266         ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
 267         if (ret) {
 268                 dev_err(info->dev, "failed to read ADC register\n");
 269                 return ret;
 270         }
 271         cable_type = adc & RT8973A_REG_ADC_MASK;
 272
 273         /* Read Device 1 reigster to identify correct cable type */
 274         ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
 275         if (ret) {
 276                 dev_err(info->dev, "failed to read DEV1 register\n");
 277                 return ret;
 278         }
 279
 280         switch (adc) {
 281         case RT8973A_MUIC_ADC_OPEN:
 282                 if (dev1 & RT8973A_REG_DEV1_USB_MASK)
 283                         cable_type = RT8973A_MUIC_ADC_USB;
 284                 else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
 285                         cable_type = RT8973A_MUIC_ADC_TA;
 286                 else
 287                         cable_type = RT8973A_MUIC_ADC_OPEN;
 288                 break;
 289         default:
 290                 break;
 291         }
 292
 293         return cable_type;
 294 }
 295
 296 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
 297                                         enum rt8973a_event_type event)
 298 {
 299         static unsigned int prev_cable_type;
 300         unsigned int con_sw = DM_DP_SWITCH_UART;
 301         int ret, cable_type;
 302         unsigned int id;
 303         bool attached = false;
 304
 305         switch (event) {
 306         case RT8973A_EVENT_ATTACH:
 307                 cable_type = rt8973a_muic_get_cable_type(info);
 308                 attached = true;
 309                 break;
 310         case RT8973A_EVENT_DETACH:
 311                 cable_type = prev_cable_type;
 312                 attached = false;
 313                 break;
 314         case RT8973A_EVENT_OVP:
 315         case RT8973A_EVENT_OTP:
 316                 dev_warn(info->dev,
 317                         "happen Over %s issue. Need to disconnect all cables\n",
 318                         event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
 319                 cable_type = prev_cable_type;
 320                 attached = false;
 321                 break;
 322         default:
 323                 dev_err(info->dev,
 324                         "Cannot handle this event (event:%d)\n", event);
 325                 return -EINVAL;
 326         }
 327         prev_cable_type = cable_type;
 328
 329         switch (cable_type) {
 330         case RT8973A_MUIC_ADC_OTG:
 331                 id = EXTCON_USB_HOST;
 332                 con_sw = DM_DP_SWITCH_USB;
 333                 break;
 334         case RT8973A_MUIC_ADC_TA:
 335                 id = EXTCON_CHG_USB_DCP;
 336                 con_sw = DM_DP_SWITCH_OPEN;
 337                 break;
 338         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
 339         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
 340                 id = EXTCON_JIG;
 341                 con_sw = DM_DP_SWITCH_USB;
 342                 break;
 343         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
 344         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
 345                 id = EXTCON_JIG;
 346                 con_sw = DM_DP_SWITCH_UART;
 347                 break;
 348         case RT8973A_MUIC_ADC_USB:
 349                 id = EXTCON_USB;
 350                 con_sw = DM_DP_SWITCH_USB;
 351                 break;
 352         case RT8973A_MUIC_ADC_OPEN:
 353                 return 0;
 354         case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
 355         case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
 356         case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
 357         case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
 358         case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
 359                 dev_warn(info->dev,
 360                         "Unknown accessory type (adc:0x%x)\n", cable_type);
 361                 return 0;
 362         case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
 363         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
 364         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
 365         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
 366         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
 367         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
 368         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
 369         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
 370         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
 371         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
 372         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
 373         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
 374         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
 375         case RT8973A_MUIC_ADC_AUDIO_TYPE2:
 376                 dev_warn(info->dev,
 377                         "Audio device/button type (adc:0x%x)\n", cable_type);
 378                 return 0;
 379         case RT8973A_MUIC_ADC_RESERVED_ACC_1:
 380         case RT8973A_MUIC_ADC_RESERVED_ACC_2:
 381         case RT8973A_MUIC_ADC_RESERVED_ACC_3:
 382         case RT8973A_MUIC_ADC_RESERVED_ACC_4:
 383         case RT8973A_MUIC_ADC_RESERVED_ACC_5:
 384         case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
 385                 return 0;
 386         default:
 387                 dev_err(info->dev,
 388                         "Cannot handle this cable_type (adc:0x%x)\n",
 389                         cable_type);
 390                 return -EINVAL;
 391         }
 392
 393         /* Change internal hardware path(DM_CON/DP_CON) */
 394         ret = rt8973a_muic_set_path(info, con_sw, attached);
 395         if (ret < 0)
 396                 return ret;
 397
 398         /* Change the state of external accessory */
 399         extcon_set_state_sync(info->edev, id, attached);
 400         if (id == EXTCON_USB)
 401                 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
 402                                         attached);
 403
 404         return 0;
 405 }
 406
 407 static void rt8973a_muic_irq_work(struct work_struct *work)
 408 {
 409         struct rt8973a_muic_info *info = container_of(work,
 410                         struct rt8973a_muic_info, irq_work);
 411         int ret = 0;
 412
 413         if (!info->edev)
 414                 return;
 415
 416         mutex_lock(&info->mutex);
 417
 418         /* Detect attached or detached cables */
 419         if (info->irq_attach) {
 420                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 421                 info->irq_attach = false;
 422         }
 423
 424         if (info->irq_detach) {
 425                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
 426                 info->irq_detach = false;
 427         }
 428
 429         if (info->irq_ovp) {
 430                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
 431                 info->irq_ovp = false;
 432         }
 433
 434         if (info->irq_otp) {
 435                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
 436                 info->irq_otp = false;
 437         }
 438
 439         if (ret < 0)
 440                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 441
 442         mutex_unlock(&info->mutex);
 443 }
 444
 445 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
 446 {
 447         struct rt8973a_muic_info *info = data;
 448         int i, irq_type = -1;
 449
 450         for (i = 0; i < info->num_muic_irqs; i++)
 451                 if (irq == info->muic_irqs[i].virq)
 452                         irq_type = info->muic_irqs[i].irq;
 453
 454         switch (irq_type) {
 455         case RT8973A_INT1_ATTACH:
 456                 info->irq_attach = true;
 457                 break;
 458         case RT8973A_INT1_DETACH:
 459                 info->irq_detach = true;
 460                 break;
 461         case RT8973A_INT1_OVP:
 462                 info->irq_ovp = true;
 463                 break;
 464         case RT8973A_INT1_OTP:
 465                 info->irq_otp = true;
 466                 break;
 467         case RT8973A_INT1_CHGDET:
 468         case RT8973A_INT1_DCD_T:
 469         case RT8973A_INT1_CONNECT:
 470         case RT8973A_INT1_ADC_CHG:
 471         case RT8973A_INT2_UVLO:
 472         case RT8973A_INT2_POR:
 473         case RT8973A_INT2_OTP_FET:
 474         case RT8973A_INT2_OVP_FET:
 475         case RT8973A_INT2_OCP_LATCH:
 476         case RT8973A_INT2_OCP:
 477         case RT8973A_INT2_OVP_OCP:
 478         default:
 479                 dev_dbg(info->dev,
 480                         "Cannot handle this interrupt (%d)\n", irq_type);
 481                 break;
 482         }
 483
 484         schedule_work(&info->irq_work);
 485
 486         return IRQ_HANDLED;
 487 }
 488
 489 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
 490 {
 491         struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
 492                                 struct rt8973a_muic_info, wq_detcable);
 493         int ret;
 494
 495         /* Notify the state of connector cable or not  */
 496         ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 497         if (ret < 0)
 498                 dev_warn(info->dev, "failed to detect cable state\n");
 499 }
 500
 501 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
 502 {
 503         unsigned int data, vendor_id, version_id;
 504         int i, ret;
 505
 506         /* To test I2C, Print version_id and vendor_id of RT8973A */
 507         ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
 508         if (ret) {
 509                 dev_err(info->dev,
 510                         "failed to read DEVICE_ID register: %d\n", ret);
 511                 return;
 512         }
 513
 514         vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
 515                                 RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
 516         version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
 517                                 RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
 518
 519         dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 520                             version_id, vendor_id);
 521
 522         /* Initiazle the register of RT8973A device to bring-up */
 523         for (i = 0; i < info->num_reg_data; i++) {
 524                 u8 reg = info->reg_data[i].reg;
 525                 u8 mask = info->reg_data[i].mask;
 526                 u8 val = 0;
 527
 528                 if (info->reg_data[i].invert)
 529                         val = ~info->reg_data[i].val;
 530                 else
 531                         val = info->reg_data[i].val;
 532
 533                 regmap_update_bits(info->regmap, reg, mask, val);
 534         }
 535
 536         /* Check whether RT8973A is auto switching mode or not */
 537         ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
 538         if (ret) {
 539                 dev_err(info->dev,
 540                         "failed to read CONTROL1 register: %d\n", ret);
 541                 return;
 542         }
 543
 544         data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
 545         if (data) {
 546                 info->auto_config = true;
 547                 dev_info(info->dev,
 548                         "Enable Auto-configuration for internal path\n");
 549         }
 550 }
 551
 552 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
 553                                  const struct i2c_device_id *id)
 554 {
 555         struct device_node *np = i2c->dev.of_node;
 556         struct rt8973a_muic_info *info;
 557         int i, ret, irq_flags;
 558
 559         if (!np)
 560                 return -EINVAL;
 561
 562         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 563         if (!info)
 564                 return -ENOMEM;
 565         i2c_set_clientdata(i2c, info);
 566
 567         info->dev = &i2c->dev;
 568         info->i2c = i2c;
 569         info->irq = i2c->irq;
 570         info->muic_irqs = rt8973a_muic_irqs;
 571         info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
 572         info->reg_data = rt8973a_reg_data;
 573         info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
 574
 575         mutex_init(&info->mutex);
 576
 577         INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
 578
 579         info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
 580         if (IS_ERR(info->regmap)) {
 581                 ret = PTR_ERR(info->regmap);
 582                 dev_err(info->dev, "failed to allocate register map: %d\n",
 583                                    ret);
 584                 return ret;
 585         }
 586
 587         /* Support irq domain for RT8973A MUIC device */
 588         irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 589         ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
 590                                   &rt8973a_muic_irq_chip, &info->irq_data);
 591         if (ret != 0) {
 592                 dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
 593                                     info->irq, ret);
 594                 return ret;
 595         }
 596
 597         for (i = 0; i < info->num_muic_irqs; i++) {
 598                 struct muic_irq *muic_irq = &info->muic_irqs[i];
 599                 int virq = 0;
 600
 601                 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
 602                 if (virq <= 0)
 603                         return -EINVAL;
 604                 muic_irq->virq = virq;
 605
 606                 ret = devm_request_threaded_irq(info->dev, virq, NULL,
 607                                                 rt8973a_muic_irq_handler,
 608                                                 IRQF_NO_SUSPEND | IRQF_ONESHOT,
 609                                                 muic_irq->name, info);
 610                 if (ret) {
 611                         dev_err(info->dev,
 612                                 "failed: irq request (IRQ: %d, error :%d)\n",
 613                                 muic_irq->irq, ret);
 614                         return ret;
 615                 }
 616         }
 617
 618         /* Allocate extcon device */
 619         info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
 620         if (IS_ERR(info->edev)) {
 621                 dev_err(info->dev, "failed to allocate memory for extcon\n");
 622                 return -ENOMEM;
 623         }
 624
 625         /* Register extcon device */
 626         ret = devm_extcon_dev_register(info->dev, info->edev);
 627         if (ret) {
 628                 dev_err(info->dev, "failed to register extcon device\n");
 629                 return ret;
 630         }
 631
 632         /*
 633          * Detect accessory after completing the initialization of platform
 634          *
 635          * - Use delayed workqueue to detect cable state and then
 636          * notify cable state to notifiee/platform through uevent.
 637          * After completing the booting of platform, the extcon provider
 638          * driver should notify cable state to upper layer.
 639          */
 640         INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
 641         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 642                         msecs_to_jiffies(DELAY_MS_DEFAULT));
 643
 644         /* Initialize RT8973A device and print vendor id and version id */
 645         rt8973a_init_dev_type(info);
 646
 647         return 0;
 648 }
 649
 650 static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
 651 {
 652         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 653
 654         regmap_del_irq_chip(info->irq, info->irq_data);
 655
 656         return 0;
 657 }
 658
 659 static const struct of_device_id rt8973a_dt_match[] = {
 660         { .compatible = "richtek,rt8973a-muic" },
 661         { },
 662 };
 663 MODULE_DEVICE_TABLE(of, rt8973a_dt_match);
 664
 665 #ifdef CONFIG_PM_SLEEP
 666 static int rt8973a_muic_suspend(struct device *dev)
 667 {
 668         struct i2c_client *i2c = to_i2c_client(dev);
 669         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 670
 671         enable_irq_wake(info->irq);
 672
 673         return 0;
 674 }
 675
 676 static int rt8973a_muic_resume(struct device *dev)
 677 {
 678         struct i2c_client *i2c = to_i2c_client(dev);
 679         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 680
 681         disable_irq_wake(info->irq);
 682
 683         return 0;
 684 }
 685 #endif
 686
 687 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
 688                          rt8973a_muic_suspend, rt8973a_muic_resume);
 689
 690 static const struct i2c_device_id rt8973a_i2c_id[] = {
 691         { "rt8973a", TYPE_RT8973A },
 692         { }
 693 };
 694 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
 695
 696 static struct i2c_driver rt8973a_muic_i2c_driver = {
 697         .driver         = {
 698                 .name   = "rt8973a",
 699                 .pm     = &rt8973a_muic_pm_ops,
 700                 .of_match_table = rt8973a_dt_match,
 701         },
 702         .probe  = rt8973a_muic_i2c_probe,
 703         .remove = rt8973a_muic_i2c_remove,
 704         .id_table = rt8973a_i2c_id,
 705 };
 706
 707 static int __init rt8973a_muic_i2c_init(void)
 708 {
 709         return i2c_add_driver(&rt8973a_muic_i2c_driver);
 710 }
 711 subsys_initcall(rt8973a_muic_i2c_init);
 712
 713 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
 714 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 715 MODULE_LICENSE("GPL");