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