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