kernel/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_OFF_USB,
  98         EXTCON_CABLE_JIG_ON_USB,
  99         EXTCON_CABLE_JIG_OFF_UART,
 100         EXTCON_CABLE_JIG_ON_UART,
 101
 102         EXTCON_CABLE_END,
 103 };
 104
 105 static const char *rt8973a_extcon_cable[] = {
 106         [EXTCON_CABLE_USB]              = "USB",
 107         [EXTCON_CABLE_USB_HOST]         = "USB-Host",
 108         [EXTCON_CABLE_TA]               = "TA",
 109         [EXTCON_CABLE_JIG_OFF_USB]      = "JIG-USB-OFF",
 110         [EXTCON_CABLE_JIG_ON_USB]       = "JIG-USB-ON",
 111         [EXTCON_CABLE_JIG_OFF_UART]     = "JIG-UART-OFF",
 112         [EXTCON_CABLE_JIG_ON_UART]      = "JIG-UART-ON",
 113         NULL,
 114 };
 115
 116 /* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
 117 enum rt8973a_event_type {
 118         RT8973A_EVENT_ATTACH = 1,
 119         RT8973A_EVENT_DETACH,
 120         RT8973A_EVENT_OVP,
 121         RT8973A_EVENT_OTP,
 122 };
 123
 124 /* Define supported accessory type */
 125 enum rt8973a_muic_acc_type {
 126         RT8973A_MUIC_ADC_OTG = 0x0,
 127         RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
 128         RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
 129         RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
 130         RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
 131         RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
 132         RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
 133         RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
 134         RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
 135         RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
 136         RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
 137         RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
 138         RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
 139         RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
 140         RT8973A_MUIC_ADC_RESERVED_ACC_1,
 141         RT8973A_MUIC_ADC_RESERVED_ACC_2,
 142         RT8973A_MUIC_ADC_RESERVED_ACC_3,
 143         RT8973A_MUIC_ADC_RESERVED_ACC_4,
 144         RT8973A_MUIC_ADC_RESERVED_ACC_5,
 145         RT8973A_MUIC_ADC_AUDIO_TYPE2,
 146         RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
 147         RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
 148         RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
 149         RT8973A_MUIC_ADC_TA,
 150         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
 151         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
 152         RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
 153         RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
 154         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
 155         RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
 156         RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
 157         RT8973A_MUIC_ADC_OPEN = 0x1f,
 158
 159         /* The below accessories has same ADC value (0x1f).
 160            So, Device type1 is used to separate specific accessory. */
 161                                         /* |---------|--ADC| */
 162                                         /* |    [7:5]|[4:0]| */
 163         RT8973A_MUIC_ADC_USB = 0x3f,    /* |      001|11111| */
 164 };
 165
 166 /* List of supported interrupt for RT8973A */
 167 static struct muic_irq rt8973a_muic_irqs[] = {
 168         { RT8973A_INT1_ATTACH,          "muic-attach" },
 169         { RT8973A_INT1_DETACH,          "muic-detach" },
 170         { RT8973A_INT1_CHGDET,          "muic-chgdet" },
 171         { RT8973A_INT1_DCD_T,           "muic-dcd-t" },
 172         { RT8973A_INT1_OVP,             "muic-ovp" },
 173         { RT8973A_INT1_CONNECT,         "muic-connect" },
 174         { RT8973A_INT1_ADC_CHG,         "muic-adc-chg" },
 175         { RT8973A_INT1_OTP,             "muic-otp" },
 176         { RT8973A_INT2_UVLO,            "muic-uvlo" },
 177         { RT8973A_INT2_POR,             "muic-por" },
 178         { RT8973A_INT2_OTP_FET,         "muic-otp-fet" },
 179         { RT8973A_INT2_OVP_FET,         "muic-ovp-fet" },
 180         { RT8973A_INT2_OCP_LATCH,       "muic-ocp-latch" },
 181         { RT8973A_INT2_OCP,             "muic-ocp" },
 182         { RT8973A_INT2_OVP_OCP,         "muic-ovp-ocp" },
 183 };
 184
 185 /* Define interrupt list of RT8973A to register regmap_irq */
 186 static const struct regmap_irq rt8973a_irqs[] = {
 187         /* INT1 interrupts */
 188         { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
 189         { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
 190         { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
 191         { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
 192         { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
 193         { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
 194         { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
 195         { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
 196
 197         /* INT2 interrupts */
 198         { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
 199         { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
 200         { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
 201         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
 202         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
 203         { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
 204         { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
 205 };
 206
 207 static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
 208         .name                   = "rt8973a",
 209         .status_base            = RT8973A_REG_INT1,
 210         .mask_base              = RT8973A_REG_INTM1,
 211         .mask_invert            = false,
 212         .num_regs               = 2,
 213         .irqs                   = rt8973a_irqs,
 214         .num_irqs               = ARRAY_SIZE(rt8973a_irqs),
 215 };
 216
 217 /* Define regmap configuration of RT8973A for I2C communication  */
 218 static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
 219 {
 220         switch (reg) {
 221         case RT8973A_REG_INTM1:
 222         case RT8973A_REG_INTM2:
 223                 return true;
 224         default:
 225                 break;
 226         }
 227         return false;
 228 }
 229
 230 static const struct regmap_config rt8973a_muic_regmap_config = {
 231         .reg_bits       = 8,
 232         .val_bits       = 8,
 233         .volatile_reg   = rt8973a_muic_volatile_reg,
 234         .max_register   = RT8973A_REG_END,
 235 };
 236
 237 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
 238 static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
 239                                 unsigned int con_sw, bool attached)
 240 {
 241         int ret;
 242
 243         /*
 244          * Don't need to set h/w path according to cable type
 245          * if Auto-configuration mode of CONTROL1 register is true.
 246          */
 247         if (info->auto_config)
 248                 return 0;
 249
 250         if (!attached)
 251                 con_sw  = DM_DP_SWITCH_UART;
 252
 253         switch (con_sw) {
 254         case DM_DP_SWITCH_OPEN:
 255         case DM_DP_SWITCH_USB:
 256         case DM_DP_SWITCH_UART:
 257                 ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
 258                                         RT8973A_REG_MANUAL_SW1_DP_MASK |
 259                                         RT8973A_REG_MANUAL_SW1_DM_MASK,
 260                                         con_sw);
 261                 if (ret < 0) {
 262                         dev_err(info->dev,
 263                                 "cannot update DM_CON/DP_CON switch\n");
 264                         return ret;
 265                 }
 266                 break;
 267         default:
 268                 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
 269                                 con_sw);
 270                 return -EINVAL;
 271         }
 272
 273         return 0;
 274 }
 275
 276 static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
 277 {
 278         unsigned int adc, dev1;
 279         int ret, cable_type;
 280
 281         /* Read ADC value according to external cable or button */
 282         ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
 283         if (ret) {
 284                 dev_err(info->dev, "failed to read ADC register\n");
 285                 return ret;
 286         }
 287         cable_type = adc & RT8973A_REG_ADC_MASK;
 288
 289         /* Read Device 1 reigster to identify correct cable type */
 290         ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
 291         if (ret) {
 292                 dev_err(info->dev, "failed to read DEV1 register\n");
 293                 return ret;
 294         }
 295
 296         switch (adc) {
 297         case RT8973A_MUIC_ADC_OPEN:
 298                 if (dev1 & RT8973A_REG_DEV1_USB_MASK)
 299                         cable_type = RT8973A_MUIC_ADC_USB;
 300                 else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
 301                         cable_type = RT8973A_MUIC_ADC_TA;
 302                 else
 303                         cable_type = RT8973A_MUIC_ADC_OPEN;
 304                 break;
 305         default:
 306                 break;
 307         }
 308
 309         return cable_type;
 310 }
 311
 312 static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
 313                                         enum rt8973a_event_type event)
 314 {
 315         static unsigned int prev_cable_type;
 316         const char **cable_names = info->edev->supported_cable;
 317         unsigned int con_sw = DM_DP_SWITCH_UART;
 318         int ret, idx = 0, cable_type;
 319         bool attached = false;
 320
 321         if (!cable_names)
 322                 return 0;
 323
 324         switch (event) {
 325         case RT8973A_EVENT_ATTACH:
 326                 cable_type = rt8973a_muic_get_cable_type(info);
 327                 attached = true;
 328                 break;
 329         case RT8973A_EVENT_DETACH:
 330                 cable_type = prev_cable_type;
 331                 attached = false;
 332                 break;
 333         case RT8973A_EVENT_OVP:
 334         case RT8973A_EVENT_OTP:
 335                 dev_warn(info->dev,
 336                         "happen Over %s issue. Need to disconnect all cables\n",
 337                         event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
 338                 cable_type = prev_cable_type;
 339                 attached = false;
 340                 break;
 341         default:
 342                 dev_err(info->dev,
 343                         "Cannot handle this event (event:%d)\n", event);
 344                 return -EINVAL;
 345         }
 346         prev_cable_type = cable_type;
 347
 348         switch (cable_type) {
 349         case RT8973A_MUIC_ADC_OTG:
 350                 idx = EXTCON_CABLE_USB_HOST;
 351                 con_sw = DM_DP_SWITCH_USB;
 352                 break;
 353         case RT8973A_MUIC_ADC_TA:
 354                 idx = EXTCON_CABLE_TA;
 355                 con_sw = DM_DP_SWITCH_OPEN;
 356                 break;
 357         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
 358                 idx = EXTCON_CABLE_JIG_OFF_USB;
 359                 con_sw = DM_DP_SWITCH_UART;
 360                 break;
 361         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
 362                 idx = EXTCON_CABLE_JIG_ON_USB;
 363                 con_sw = DM_DP_SWITCH_UART;
 364                 break;
 365         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
 366                 idx = EXTCON_CABLE_JIG_OFF_UART;
 367                 con_sw = DM_DP_SWITCH_UART;
 368                 break;
 369         case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
 370                 idx = EXTCON_CABLE_JIG_ON_UART;
 371                 con_sw = DM_DP_SWITCH_UART;
 372                 break;
 373         case RT8973A_MUIC_ADC_USB:
 374                 idx = EXTCON_CABLE_USB;
 375                 con_sw = DM_DP_SWITCH_USB;
 376                 break;
 377         case RT8973A_MUIC_ADC_OPEN:
 378                 return 0;
 379         case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
 380         case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
 381         case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
 382         case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
 383         case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
 384                 dev_warn(info->dev,
 385                         "Unknown accessory type (adc:0x%x)\n", cable_type);
 386                 return 0;
 387         case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
 388         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
 389         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
 390         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
 391         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
 392         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
 393         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
 394         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
 395         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
 396         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
 397         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
 398         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
 399         case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
 400         case RT8973A_MUIC_ADC_AUDIO_TYPE2:
 401                 dev_warn(info->dev,
 402                         "Audio device/button type (adc:0x%x)\n", cable_type);
 403                 return 0;
 404         case RT8973A_MUIC_ADC_RESERVED_ACC_1:
 405         case RT8973A_MUIC_ADC_RESERVED_ACC_2:
 406         case RT8973A_MUIC_ADC_RESERVED_ACC_3:
 407         case RT8973A_MUIC_ADC_RESERVED_ACC_4:
 408         case RT8973A_MUIC_ADC_RESERVED_ACC_5:
 409         case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
 410                 return 0;
 411         default:
 412                 dev_err(info->dev,
 413                         "Cannot handle this cable_type (adc:0x%x)\n",
 414                         cable_type);
 415                 return -EINVAL;
 416         }
 417
 418         /* Change internal hardware path(DM_CON/DP_CON) */
 419         ret = rt8973a_muic_set_path(info, con_sw, attached);
 420         if (ret < 0)
 421                 return ret;
 422
 423         /* Change the state of external accessory */
 424         extcon_set_cable_state(info->edev, cable_names[idx], attached);
 425
 426         return 0;
 427 }
 428
 429 static void rt8973a_muic_irq_work(struct work_struct *work)
 430 {
 431         struct rt8973a_muic_info *info = container_of(work,
 432                         struct rt8973a_muic_info, irq_work);
 433         int ret = 0;
 434
 435         if (!info->edev)
 436                 return;
 437
 438         mutex_lock(&info->mutex);
 439
 440         /* Detect attached or detached cables */
 441         if (info->irq_attach) {
 442                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 443                 info->irq_attach = false;
 444         }
 445
 446         if (info->irq_detach) {
 447                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
 448                 info->irq_detach = false;
 449         }
 450
 451         if (info->irq_ovp) {
 452                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
 453                 info->irq_ovp = false;
 454         }
 455
 456         if (info->irq_otp) {
 457                 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
 458                 info->irq_otp = false;
 459         }
 460
 461         if (ret < 0)
 462                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 463
 464         mutex_unlock(&info->mutex);
 465 }
 466
 467 static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
 468 {
 469         struct rt8973a_muic_info *info = data;
 470         int i, irq_type = -1;
 471
 472         for (i = 0; i < info->num_muic_irqs; i++)
 473                 if (irq == info->muic_irqs[i].virq)
 474                         irq_type = info->muic_irqs[i].irq;
 475
 476         switch (irq_type) {
 477         case RT8973A_INT1_ATTACH:
 478                 info->irq_attach = true;
 479                 break;
 480         case RT8973A_INT1_DETACH:
 481                 info->irq_detach = true;
 482                 break;
 483         case RT8973A_INT1_OVP:
 484                 info->irq_ovp = true;
 485                 break;
 486         case RT8973A_INT1_OTP:
 487                 info->irq_otp = true;
 488                 break;
 489         case RT8973A_INT1_CHGDET:
 490         case RT8973A_INT1_DCD_T:
 491         case RT8973A_INT1_CONNECT:
 492         case RT8973A_INT1_ADC_CHG:
 493         case RT8973A_INT2_UVLO:
 494         case RT8973A_INT2_POR:
 495         case RT8973A_INT2_OTP_FET:
 496         case RT8973A_INT2_OVP_FET:
 497         case RT8973A_INT2_OCP_LATCH:
 498         case RT8973A_INT2_OCP:
 499         case RT8973A_INT2_OVP_OCP:
 500         default:
 501                 dev_dbg(info->dev,
 502                         "Cannot handle this interrupt (%d)\n", irq_type);
 503                 break;
 504         }
 505
 506         schedule_work(&info->irq_work);
 507
 508         return IRQ_HANDLED;
 509 }
 510
 511 static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
 512 {
 513         struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
 514                                 struct rt8973a_muic_info, wq_detcable);
 515         int ret;
 516
 517         /* Notify the state of connector cable or not  */
 518         ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
 519         if (ret < 0)
 520                 dev_warn(info->dev, "failed to detect cable state\n");
 521 }
 522
 523 static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
 524 {
 525         unsigned int data, vendor_id, version_id;
 526         int i, ret;
 527
 528         /* To test I2C, Print version_id and vendor_id of RT8973A */
 529         ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
 530         if (ret) {
 531                 dev_err(info->dev,
 532                         "failed to read DEVICE_ID register: %d\n", ret);
 533                 return;
 534         }
 535
 536         vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
 537                                 RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
 538         version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
 539                                 RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
 540
 541         dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 542                             version_id, vendor_id);
 543
 544         /* Initiazle the register of RT8973A device to bring-up */
 545         for (i = 0; i < info->num_reg_data; i++) {
 546                 u8 reg = info->reg_data[i].reg;
 547                 u8 mask = info->reg_data[i].mask;
 548                 u8 val = 0;
 549
 550                 if (info->reg_data[i].invert)
 551                         val = ~info->reg_data[i].val;
 552                 else
 553                         val = info->reg_data[i].val;
 554
 555                 regmap_update_bits(info->regmap, reg, mask, val);
 556         }
 557
 558         /* Check whether RT8973A is auto swithcing mode or not */
 559         ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
 560         if (ret) {
 561                 dev_err(info->dev,
 562                         "failed to read CONTROL1 register: %d\n", ret);
 563                 return;
 564         }
 565
 566         data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
 567         if (data) {
 568                 info->auto_config = true;
 569                 dev_info(info->dev,
 570                         "Enable Auto-configuration for internal path\n");
 571         }
 572 }
 573
 574 static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
 575                                  const struct i2c_device_id *id)
 576 {
 577         struct device_node *np = i2c->dev.of_node;
 578         struct rt8973a_muic_info *info;
 579         int i, ret, irq_flags;
 580
 581         if (!np)
 582                 return -EINVAL;
 583
 584         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 585         if (!info)
 586                 return -ENOMEM;
 587         i2c_set_clientdata(i2c, info);
 588
 589         info->dev = &i2c->dev;
 590         info->i2c = i2c;
 591         info->irq = i2c->irq;
 592         info->muic_irqs = rt8973a_muic_irqs;
 593         info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
 594         info->reg_data = rt8973a_reg_data;
 595         info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
 596
 597         mutex_init(&info->mutex);
 598
 599         INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
 600
 601         info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
 602         if (IS_ERR(info->regmap)) {
 603                 ret = PTR_ERR(info->regmap);
 604                 dev_err(info->dev, "failed to allocate register map: %d\n",
 605                                    ret);
 606                 return ret;
 607         }
 608
 609         /* Support irq domain for RT8973A MUIC device */
 610         irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 611         ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
 612                                   &rt8973a_muic_irq_chip, &info->irq_data);
 613         if (ret != 0) {
 614                 dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
 615                                     info->irq, ret);
 616                 return ret;
 617         }
 618
 619         for (i = 0; i < info->num_muic_irqs; i++) {
 620                 struct muic_irq *muic_irq = &info->muic_irqs[i];
 621                 unsigned int virq = 0;
 622
 623                 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
 624                 if (virq <= 0)
 625                         return -EINVAL;
 626                 muic_irq->virq = virq;
 627
 628                 ret = devm_request_threaded_irq(info->dev, virq, NULL,
 629                                                 rt8973a_muic_irq_handler,
 630                                                 IRQF_NO_SUSPEND,
 631                                                 muic_irq->name, info);
 632                 if (ret) {
 633                         dev_err(info->dev,
 634                                 "failed: irq request (IRQ: %d, error :%d)\n",
 635                                 muic_irq->irq, ret);
 636                         return ret;
 637                 }
 638         }
 639
 640         /* Allocate extcon device */
 641         info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
 642         if (IS_ERR(info->edev)) {
 643                 dev_err(info->dev, "failed to allocate memory for extcon\n");
 644                 return -ENOMEM;
 645         }
 646         info->edev->name = np->name;
 647
 648         /* Register extcon device */
 649         ret = devm_extcon_dev_register(info->dev, info->edev);
 650         if (ret) {
 651                 dev_err(info->dev, "failed to register extcon device\n");
 652                 return ret;
 653         }
 654
 655         /*
 656          * Detect accessory after completing the initialization of platform
 657          *
 658          * - Use delayed workqueue to detect cable state and then
 659          * notify cable state to notifiee/platform through uevent.
 660          * After completing the booting of platform, the extcon provider
 661          * driver should notify cable state to upper layer.
 662          */
 663         INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);
 664         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 665                         msecs_to_jiffies(DELAY_MS_DEFAULT));
 666
 667         /* Initialize RT8973A device and print vendor id and version id */
 668         rt8973a_init_dev_type(info);
 669
 670         return 0;
 671 }
 672
 673 static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
 674 {
 675         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 676
 677         regmap_del_irq_chip(info->irq, info->irq_data);
 678
 679         return 0;
 680 }
 681
 682 static const struct of_device_id rt8973a_dt_match[] = {
 683         { .compatible = "richtek,rt8973a-muic" },
 684         { },
 685 };
 686
 687 #ifdef CONFIG_PM_SLEEP
 688 static int rt8973a_muic_suspend(struct device *dev)
 689 {
 690         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 691         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 692
 693         enable_irq_wake(info->irq);
 694
 695         return 0;
 696 }
 697
 698 static int rt8973a_muic_resume(struct device *dev)
 699 {
 700         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 701         struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 702
 703         disable_irq_wake(info->irq);
 704
 705         return 0;
 706 }
 707 #endif
 708
 709 static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
 710                          rt8973a_muic_suspend, rt8973a_muic_resume);
 711
 712 static const struct i2c_device_id rt8973a_i2c_id[] = {
 713         { "rt8973a", TYPE_RT8973A },
 714         { }
 715 };
 716 MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
 717
 718 static struct i2c_driver rt8973a_muic_i2c_driver = {
 719         .driver         = {
 720                 .name   = "rt8973a",
 721                 .owner  = THIS_MODULE,
 722                 .pm     = &rt8973a_muic_pm_ops,
 723                 .of_match_table = rt8973a_dt_match,
 724         },
 725         .probe  = rt8973a_muic_i2c_probe,
 726         .remove = rt8973a_muic_i2c_remove,
 727         .id_table = rt8973a_i2c_id,
 728 };
 729
 730 static int __init rt8973a_muic_i2c_init(void)
 731 {
 732         return i2c_add_driver(&rt8973a_muic_i2c_driver);
 733 }
 734 subsys_initcall(rt8973a_muic_i2c_init);
 735
 736 MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
 737 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 738 MODULE_LICENSE("GPL");