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