drivers/extcon/extcon-sm5502.c

   1 /*
   2  * extcon-sm5502.c - Silicon Mitus SM5502 extcon drvier 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  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/err.h>
  19 #include <linux/i2c.h>
  20 #include <linux/input.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irqdomain.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/regmap.h>
  27 #include <linux/slab.h>
  28 #include <linux/extcon.h>
  29 #include <linux/extcon/sm5502.h>
  30
  31 #define DELAY_MS_DEFAULT                17000   /* unit: millisecond */
  32
  33 struct muic_irq {
  34         unsigned int irq;
  35         const char *name;
  36         unsigned int virq;
  37 };
  38
  39 struct reg_data {
  40         u8 reg;
  41         unsigned int val;
  42         bool invert;
  43 };
  44
  45 struct sm5502_muic_info {
  46         struct device *dev;
  47         struct extcon_dev *edev;
  48
  49         struct i2c_client *i2c;
  50         struct regmap *regmap;
  51
  52         struct regmap_irq_chip_data *irq_data;
  53         struct muic_irq *muic_irqs;
  54         unsigned int num_muic_irqs;
  55         int irq;
  56         bool irq_attach;
  57         bool irq_detach;
  58         struct work_struct irq_work;
  59
  60         struct reg_data *reg_data;
  61         unsigned int num_reg_data;
  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 SM5502 register to bring up MUIC device. */
  75 static struct reg_data sm5502_reg_data[] = {
  76         {
  77                 .reg = SM5502_REG_CONTROL,
  78                 .val = SM5502_REG_CONTROL_MASK_INT_MASK,
  79                 .invert = false,
  80         }, {
  81                 .reg = SM5502_REG_INTMASK1,
  82                 .val = SM5502_REG_INTM1_KP_MASK
  83                         | SM5502_REG_INTM1_LKP_MASK
  84                         | SM5502_REG_INTM1_LKR_MASK,
  85                 .invert = true,
  86         }, {
  87                 .reg = SM5502_REG_INTMASK2,
  88                 .val = SM5502_REG_INTM2_VBUS_DET_MASK
  89                         | SM5502_REG_INTM2_REV_ACCE_MASK
  90                         | SM5502_REG_INTM2_ADC_CHG_MASK
  91                         | SM5502_REG_INTM2_STUCK_KEY_MASK
  92                         | SM5502_REG_INTM2_STUCK_KEY_RCV_MASK
  93                         | SM5502_REG_INTM2_MHL_MASK,
  94                 .invert = true,
  95         },
  96         { }
  97 };
  98
  99 /* List of detectable cables */
 100 enum {
 101         EXTCON_CABLE_USB = 0,
 102         EXTCON_CABLE_USB_HOST,
 103         EXTCON_CABLE_TA,
 104
 105         EXTCON_CABLE_END,
 106 };
 107
 108 static const char *sm5502_extcon_cable[] = {
 109         [EXTCON_CABLE_USB]      = "USB",
 110         [EXTCON_CABLE_USB_HOST] = "USB-Host",
 111         [EXTCON_CABLE_TA]       = "TA",
 112         NULL,
 113 };
 114
 115 /* Define supported accessory type */
 116 enum sm5502_muic_acc_type {
 117         SM5502_MUIC_ADC_GROUND = 0x0,
 118         SM5502_MUIC_ADC_SEND_END_BUTTON,
 119         SM5502_MUIC_ADC_REMOTE_S1_BUTTON,
 120         SM5502_MUIC_ADC_REMOTE_S2_BUTTON,
 121         SM5502_MUIC_ADC_REMOTE_S3_BUTTON,
 122         SM5502_MUIC_ADC_REMOTE_S4_BUTTON,
 123         SM5502_MUIC_ADC_REMOTE_S5_BUTTON,
 124         SM5502_MUIC_ADC_REMOTE_S6_BUTTON,
 125         SM5502_MUIC_ADC_REMOTE_S7_BUTTON,
 126         SM5502_MUIC_ADC_REMOTE_S8_BUTTON,
 127         SM5502_MUIC_ADC_REMOTE_S9_BUTTON,
 128         SM5502_MUIC_ADC_REMOTE_S10_BUTTON,
 129         SM5502_MUIC_ADC_REMOTE_S11_BUTTON,
 130         SM5502_MUIC_ADC_REMOTE_S12_BUTTON,
 131         SM5502_MUIC_ADC_RESERVED_ACC_1,
 132         SM5502_MUIC_ADC_RESERVED_ACC_2,
 133         SM5502_MUIC_ADC_RESERVED_ACC_3,
 134         SM5502_MUIC_ADC_RESERVED_ACC_4,
 135         SM5502_MUIC_ADC_RESERVED_ACC_5,
 136         SM5502_MUIC_ADC_AUDIO_TYPE2,
 137         SM5502_MUIC_ADC_PHONE_POWERED_DEV,
 138         SM5502_MUIC_ADC_TTY_CONVERTER,
 139         SM5502_MUIC_ADC_UART_CABLE,
 140         SM5502_MUIC_ADC_TYPE1_CHARGER,
 141         SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
 142         SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
 143         SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE,
 144         SM5502_MUIC_ADC_TYPE2_CHARGER,
 145         SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
 146         SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
 147         SM5502_MUIC_ADC_AUDIO_TYPE1,
 148         SM5502_MUIC_ADC_OPEN = 0x1f,
 149
 150         /* The below accessories have same ADC value (0x1f or 0x1e).
 151            So, Device type1 is used to separate specific accessory. */
 152                                                         /* |---------|--ADC| */
 153                                                         /* |    [7:5]|[4:0]| */
 154         SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE = 0x3e, /* |      001|11110| */
 155         SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END = 0x5e,    /* |      010|11110| */
 156                                                         /* |Dev Type1|--ADC| */
 157         SM5502_MUIC_ADC_OPEN_USB = 0x5f,                /* |      010|11111| */
 158         SM5502_MUIC_ADC_OPEN_TA = 0xdf,                 /* |      110|11111| */
 159         SM5502_MUIC_ADC_OPEN_USB_OTG = 0xff,            /* |      111|11111| */
 160 };
 161
 162 /* List of supported interrupt for SM5502 */
 163 static struct muic_irq sm5502_muic_irqs[] = {
 164         { SM5502_IRQ_INT1_ATTACH,       "muic-attach" },
 165         { SM5502_IRQ_INT1_DETACH,       "muic-detach" },
 166         { SM5502_IRQ_INT1_KP,           "muic-kp" },
 167         { SM5502_IRQ_INT1_LKP,          "muic-lkp" },
 168         { SM5502_IRQ_INT1_LKR,          "muic-lkr" },
 169         { SM5502_IRQ_INT1_OVP_EVENT,    "muic-ovp-event" },
 170         { SM5502_IRQ_INT1_OCP_EVENT,    "muic-ocp-event" },
 171         { SM5502_IRQ_INT1_OVP_OCP_DIS,  "muic-ovp-ocp-dis" },
 172         { SM5502_IRQ_INT2_VBUS_DET,     "muic-vbus-det" },
 173         { SM5502_IRQ_INT2_REV_ACCE,     "muic-rev-acce" },
 174         { SM5502_IRQ_INT2_ADC_CHG,      "muic-adc-chg" },
 175         { SM5502_IRQ_INT2_STUCK_KEY,    "muic-stuck-key" },
 176         { SM5502_IRQ_INT2_STUCK_KEY_RCV, "muic-stuck-key-rcv" },
 177         { SM5502_IRQ_INT2_MHL,          "muic-mhl" },
 178 };
 179
 180 /* Define interrupt list of SM5502 to register regmap_irq */
 181 static const struct regmap_irq sm5502_irqs[] = {
 182         /* INT1 interrupts */
 183         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_ATTACH_MASK, },
 184         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_DETACH_MASK, },
 185         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_KP_MASK, },
 186         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKP_MASK, },
 187         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_LKR_MASK, },
 188         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_EVENT_MASK, },
 189         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_OCP_EVENT_MASK, },
 190         { .reg_offset = 0, .mask = SM5502_IRQ_INT1_OVP_OCP_DIS_MASK, },
 191
 192         /* INT2 interrupts */
 193         { .reg_offset = 1, .mask = SM5502_IRQ_INT2_VBUS_DET_MASK,},
 194         { .reg_offset = 1, .mask = SM5502_IRQ_INT2_REV_ACCE_MASK, },
 195         { .reg_offset = 1, .mask = SM5502_IRQ_INT2_ADC_CHG_MASK, },
 196         { .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_MASK, },
 197         { .reg_offset = 1, .mask = SM5502_IRQ_INT2_STUCK_KEY_RCV_MASK, },
 198         { .reg_offset = 1, .mask = SM5502_IRQ_INT2_MHL_MASK, },
 199 };
 200
 201 static const struct regmap_irq_chip sm5502_muic_irq_chip = {
 202         .name                   = "sm5502",
 203         .status_base            = SM5502_REG_INT1,
 204         .mask_base              = SM5502_REG_INTMASK1,
 205         .mask_invert            = false,
 206         .num_regs               = 2,
 207         .irqs                   = sm5502_irqs,
 208         .num_irqs               = ARRAY_SIZE(sm5502_irqs),
 209 };
 210
 211 /* Define regmap configuration of SM5502 for I2C communication  */
 212 static bool sm5502_muic_volatile_reg(struct device *dev, unsigned int reg)
 213 {
 214         switch (reg) {
 215         case SM5502_REG_INTMASK1:
 216         case SM5502_REG_INTMASK2:
 217                 return true;
 218         default:
 219                 break;
 220         }
 221         return false;
 222 }
 223
 224 static const struct regmap_config sm5502_muic_regmap_config = {
 225         .reg_bits       = 8,
 226         .val_bits       = 8,
 227         .volatile_reg   = sm5502_muic_volatile_reg,
 228         .max_register   = SM5502_REG_END,
 229 };
 230
 231 /* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
 232 static int sm5502_muic_set_path(struct sm5502_muic_info *info,
 233                                 unsigned int con_sw, unsigned int vbus_sw,
 234                                 bool attached)
 235 {
 236         int ret;
 237
 238         if (!attached) {
 239                 con_sw  = DM_DP_SWITCH_OPEN;
 240                 vbus_sw = VBUSIN_SWITCH_OPEN;
 241         }
 242
 243         switch (con_sw) {
 244         case DM_DP_SWITCH_OPEN:
 245         case DM_DP_SWITCH_USB:
 246         case DM_DP_SWITCH_AUDIO:
 247         case DM_DP_SWITCH_UART:
 248                 ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
 249                                          SM5502_REG_MANUAL_SW1_DP_MASK |
 250                                          SM5502_REG_MANUAL_SW1_DM_MASK,
 251                                          con_sw);
 252                 if (ret < 0) {
 253                         dev_err(info->dev,
 254                                 "cannot update DM_CON/DP_CON switch\n");
 255                         return ret;
 256                 }
 257                 break;
 258         default:
 259                 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
 260                                 con_sw);
 261                 return -EINVAL;
 262         };
 263
 264         switch (vbus_sw) {
 265         case VBUSIN_SWITCH_OPEN:
 266         case VBUSIN_SWITCH_VBUSOUT:
 267         case VBUSIN_SWITCH_MIC:
 268         case VBUSIN_SWITCH_VBUSOUT_WITH_USB:
 269                 ret = regmap_update_bits(info->regmap, SM5502_REG_MANUAL_SW1,
 270                                          SM5502_REG_MANUAL_SW1_VBUSIN_MASK,
 271                                          vbus_sw);
 272                 if (ret < 0) {
 273                         dev_err(info->dev,
 274                                 "cannot update VBUSIN switch\n");
 275                         return ret;
 276                 }
 277                 break;
 278         default:
 279                 dev_err(info->dev, "Unknown VBUS switch type (%d)\n", vbus_sw);
 280                 return -EINVAL;
 281         };
 282
 283         return 0;
 284 }
 285
 286 /* Return cable type of attached or detached accessories */
 287 static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
 288 {
 289         unsigned int cable_type = -1, adc, dev_type1;
 290         int ret;
 291
 292         /* Read ADC value according to external cable or button */
 293         ret = regmap_read(info->regmap, SM5502_REG_ADC, &adc);
 294         if (ret) {
 295                 dev_err(info->dev, "failed to read ADC register\n");
 296                 return ret;
 297         }
 298
 299         /*
 300          * If ADC is SM5502_MUIC_ADC_GROUND(0x0), external cable hasn't
 301          * connected with to MUIC device.
 302          */
 303         cable_type &= SM5502_REG_ADC_MASK;
 304         if (cable_type == SM5502_MUIC_ADC_GROUND)
 305                 return SM5502_MUIC_ADC_GROUND;
 306
 307         switch (cable_type) {
 308         case SM5502_MUIC_ADC_GROUND:
 309         case SM5502_MUIC_ADC_SEND_END_BUTTON:
 310         case SM5502_MUIC_ADC_REMOTE_S1_BUTTON:
 311         case SM5502_MUIC_ADC_REMOTE_S2_BUTTON:
 312         case SM5502_MUIC_ADC_REMOTE_S3_BUTTON:
 313         case SM5502_MUIC_ADC_REMOTE_S4_BUTTON:
 314         case SM5502_MUIC_ADC_REMOTE_S5_BUTTON:
 315         case SM5502_MUIC_ADC_REMOTE_S6_BUTTON:
 316         case SM5502_MUIC_ADC_REMOTE_S7_BUTTON:
 317         case SM5502_MUIC_ADC_REMOTE_S8_BUTTON:
 318         case SM5502_MUIC_ADC_REMOTE_S9_BUTTON:
 319         case SM5502_MUIC_ADC_REMOTE_S10_BUTTON:
 320         case SM5502_MUIC_ADC_REMOTE_S11_BUTTON:
 321         case SM5502_MUIC_ADC_REMOTE_S12_BUTTON:
 322         case SM5502_MUIC_ADC_RESERVED_ACC_1:
 323         case SM5502_MUIC_ADC_RESERVED_ACC_2:
 324         case SM5502_MUIC_ADC_RESERVED_ACC_3:
 325         case SM5502_MUIC_ADC_RESERVED_ACC_4:
 326         case SM5502_MUIC_ADC_RESERVED_ACC_5:
 327         case SM5502_MUIC_ADC_AUDIO_TYPE2:
 328         case SM5502_MUIC_ADC_PHONE_POWERED_DEV:
 329         case SM5502_MUIC_ADC_TTY_CONVERTER:
 330         case SM5502_MUIC_ADC_UART_CABLE:
 331         case SM5502_MUIC_ADC_TYPE1_CHARGER:
 332         case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
 333         case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
 334         case SM5502_MUIC_ADC_AUDIO_VIDEO_CABLE:
 335         case SM5502_MUIC_ADC_TYPE2_CHARGER:
 336         case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
 337         case SM5502_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
 338                 break;
 339         case SM5502_MUIC_ADC_AUDIO_TYPE1:
 340                 /*
 341                  * Check whether cable type is
 342                  * SM5502_MUIC_ADC_AUDIO_TYPE1_FULL_REMOTE
 343                  * or SM5502_MUIC_ADC_AUDIO_TYPE1_SEND_END
 344                  * by using Button event.
 345                  */
 346                 break;
 347         case SM5502_MUIC_ADC_OPEN:
 348                 ret = regmap_read(info->regmap, SM5502_REG_DEV_TYPE1,
 349                                   &dev_type1);
 350                 if (ret) {
 351                         dev_err(info->dev, "failed to read DEV_TYPE1 reg\n");
 352                         return ret;
 353                 }
 354
 355                 switch (dev_type1) {
 356                 case SM5502_REG_DEV_TYPE1_USB_SDP_MASK:
 357                         cable_type = SM5502_MUIC_ADC_OPEN_USB;
 358                         break;
 359                 case SM5502_REG_DEV_TYPE1_DEDICATED_CHG_MASK:
 360                         cable_type = SM5502_MUIC_ADC_OPEN_TA;
 361                         break;
 362                 case SM5502_REG_DEV_TYPE1_USB_OTG_MASK:
 363                         cable_type = SM5502_MUIC_ADC_OPEN_USB_OTG;
 364                         break;
 365                 default:
 366                         dev_dbg(info->dev,
 367                                 "cannot identify the cable type: adc(0x%x) "
 368                                 "dev_type1(0x%x)\n", adc, dev_type1);
 369                         return -EINVAL;
 370                 };
 371                 break;
 372         default:
 373                 dev_err(info->dev,
 374                         "failed to identify the cable type: adc(0x%x)\n", adc);
 375                 return -EINVAL;
 376         };
 377
 378         return cable_type;
 379 }
 380
 381 static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
 382                                      bool attached)
 383 {
 384         static unsigned int prev_cable_type = SM5502_MUIC_ADC_GROUND;
 385         const char **cable_names = info->edev->supported_cable;
 386         unsigned int cable_type = SM5502_MUIC_ADC_GROUND;
 387         unsigned int con_sw = DM_DP_SWITCH_OPEN;
 388         unsigned int vbus_sw = VBUSIN_SWITCH_OPEN;
 389         unsigned int idx = 0;
 390         int ret;
 391
 392         if (!cable_names)
 393                 return 0;
 394
 395         /* Get the type of attached or detached cable */
 396         if (attached)
 397                 cable_type = sm5502_muic_get_cable_type(info);
 398         else if (!attached)
 399                 cable_type = prev_cable_type;
 400         prev_cable_type = cable_type;
 401
 402         switch (cable_type) {
 403         case SM5502_MUIC_ADC_OPEN_USB:
 404                 idx     = EXTCON_CABLE_USB;
 405                 con_sw  = DM_DP_SWITCH_USB;
 406                 vbus_sw = VBUSIN_SWITCH_VBUSOUT_WITH_USB;
 407                 break;
 408         case SM5502_MUIC_ADC_OPEN_TA:
 409                 idx     = EXTCON_CABLE_TA;
 410                 con_sw  = DM_DP_SWITCH_OPEN;
 411                 vbus_sw = VBUSIN_SWITCH_VBUSOUT;
 412                 break;
 413         case SM5502_MUIC_ADC_OPEN_USB_OTG:
 414                 idx     = EXTCON_CABLE_USB_HOST;
 415                 con_sw  = DM_DP_SWITCH_USB;
 416                 vbus_sw = VBUSIN_SWITCH_OPEN;
 417                 break;
 418         default:
 419                 dev_dbg(info->dev,
 420                         "cannot handle this cable_type (0x%x)\n", cable_type);
 421                 return 0;
 422         };
 423
 424         /* Change internal hardware path(DM_CON/DP_CON, VBUSIN) */
 425         ret = sm5502_muic_set_path(info, con_sw, vbus_sw, attached);
 426         if (ret < 0)
 427                 return ret;
 428
 429         /* Change the state of external accessory */
 430         extcon_set_cable_state(info->edev, cable_names[idx], attached);
 431
 432         return 0;
 433 }
 434
 435 static void sm5502_muic_irq_work(struct work_struct *work)
 436 {
 437         struct sm5502_muic_info *info = container_of(work,
 438                         struct sm5502_muic_info, irq_work);
 439         int ret = 0;
 440
 441         if (!info->edev)
 442                 return;
 443
 444         mutex_lock(&info->mutex);
 445
 446         /* Detect attached or detached cables */
 447         if (info->irq_attach) {
 448                 ret = sm5502_muic_cable_handler(info, true);
 449                 info->irq_attach = false;
 450         }
 451         if (info->irq_detach) {
 452                 ret = sm5502_muic_cable_handler(info, false);
 453                 info->irq_detach = false;
 454         }
 455
 456         if (ret < 0)
 457                 dev_err(info->dev, "failed to handle MUIC interrupt\n");
 458
 459         mutex_unlock(&info->mutex);
 460
 461         return;
 462 }
 463
 464 /*
 465  * Sets irq_attach or irq_detach in sm5502_muic_info and returns 0.
 466  * Returns -ESRCH if irq_type does not match registered IRQ for this dev type.
 467  */
 468 static int sm5502_parse_irq(struct sm5502_muic_info *info, int irq_type)
 469 {
 470         switch (irq_type) {
 471         case SM5502_IRQ_INT1_ATTACH:
 472                 info->irq_attach = true;
 473                 break;
 474         case SM5502_IRQ_INT1_DETACH:
 475                 info->irq_detach = true;
 476                 break;
 477         case SM5502_IRQ_INT1_KP:
 478         case SM5502_IRQ_INT1_LKP:
 479         case SM5502_IRQ_INT1_LKR:
 480         case SM5502_IRQ_INT1_OVP_EVENT:
 481         case SM5502_IRQ_INT1_OCP_EVENT:
 482         case SM5502_IRQ_INT1_OVP_OCP_DIS:
 483         case SM5502_IRQ_INT2_VBUS_DET:
 484         case SM5502_IRQ_INT2_REV_ACCE:
 485         case SM5502_IRQ_INT2_ADC_CHG:
 486         case SM5502_IRQ_INT2_STUCK_KEY:
 487         case SM5502_IRQ_INT2_STUCK_KEY_RCV:
 488         case SM5502_IRQ_INT2_MHL:
 489         default:
 490                 break;
 491         }
 492
 493         return 0;
 494 }
 495
 496 static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
 497 {
 498         struct sm5502_muic_info *info = data;
 499         int i, irq_type = -1, ret;
 500
 501         for (i = 0; i < info->num_muic_irqs; i++)
 502                 if (irq == info->muic_irqs[i].virq)
 503                         irq_type = info->muic_irqs[i].irq;
 504
 505         ret = sm5502_parse_irq(info, irq_type);
 506         if (ret < 0) {
 507                 dev_warn(info->dev, "cannot handle is interrupt:%d\n",
 508                                     irq_type);
 509                 return IRQ_HANDLED;
 510         }
 511         schedule_work(&info->irq_work);
 512
 513         return IRQ_HANDLED;
 514 }
 515
 516 static void sm5502_muic_detect_cable_wq(struct work_struct *work)
 517 {
 518         struct sm5502_muic_info *info = container_of(to_delayed_work(work),
 519                                 struct sm5502_muic_info, wq_detcable);
 520         int ret;
 521
 522         /* Notify the state of connector cable or not  */
 523         ret = sm5502_muic_cable_handler(info, true);
 524         if (ret < 0)
 525                 dev_warn(info->dev, "failed to detect cable state\n");
 526 }
 527
 528 static void sm5502_init_dev_type(struct sm5502_muic_info *info)
 529 {
 530         unsigned int reg_data, vendor_id, version_id;
 531         int i, ret;
 532
 533         /* To test I2C, Print version_id and vendor_id of SM5502 */
 534         ret = regmap_read(info->regmap, SM5502_REG_DEVICE_ID, &reg_data);
 535         if (ret) {
 536                 dev_err(info->dev,
 537                         "failed to read DEVICE_ID register: %d\n", ret);
 538                 return;
 539         }
 540
 541         vendor_id = ((reg_data & SM5502_REG_DEVICE_ID_VENDOR_MASK) >>
 542                                 SM5502_REG_DEVICE_ID_VENDOR_SHIFT);
 543         version_id = ((reg_data & SM5502_REG_DEVICE_ID_VERSION_MASK) >>
 544                                 SM5502_REG_DEVICE_ID_VERSION_SHIFT);
 545
 546         dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
 547                             version_id, vendor_id);
 548
 549         /* Initiazle the register of SM5502 device to bring-up */
 550         for (i = 0; i < info->num_reg_data; i++) {
 551                 unsigned int val = 0;
 552
 553                 if (!info->reg_data[i].invert)
 554                         val |= ~info->reg_data[i].val;
 555                 else
 556                         val = info->reg_data[i].val;
 557                 regmap_write(info->regmap, info->reg_data[i].reg, val);
 558         }
 559 }
 560
 561 static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
 562                                  const struct i2c_device_id *id)
 563 {
 564         struct device_node *np = i2c->dev.of_node;
 565         struct sm5502_muic_info *info;
 566         int i, ret, irq_flags;
 567
 568         if (!np)
 569                 return -EINVAL;
 570
 571         info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
 572         if (!info)
 573                 return -ENOMEM;
 574         i2c_set_clientdata(i2c, info);
 575
 576         info->dev = &i2c->dev;
 577         info->i2c = i2c;
 578         info->irq = i2c->irq;
 579         info->muic_irqs = sm5502_muic_irqs;
 580         info->num_muic_irqs = ARRAY_SIZE(sm5502_muic_irqs);
 581         info->reg_data = sm5502_reg_data;
 582         info->num_reg_data = ARRAY_SIZE(sm5502_reg_data);
 583
 584         mutex_init(&info->mutex);
 585
 586         INIT_WORK(&info->irq_work, sm5502_muic_irq_work);
 587
 588         info->regmap = devm_regmap_init_i2c(i2c, &sm5502_muic_regmap_config);
 589         if (IS_ERR(info->regmap)) {
 590                 ret = PTR_ERR(info->regmap);
 591                 dev_err(info->dev, "failed to allocate register map: %d\n",
 592                                    ret);
 593                 return ret;
 594         }
 595
 596         /* Support irq domain for SM5502 MUIC device */
 597         irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
 598         ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
 599                                   &sm5502_muic_irq_chip, &info->irq_data);
 600         if (ret != 0) {
 601                 dev_err(info->dev, "failed to request IRQ %d: %d\n",
 602                                     info->irq, ret);
 603                 return ret;
 604         }
 605
 606         for (i = 0; i < info->num_muic_irqs; i++) {
 607                 struct muic_irq *muic_irq = &info->muic_irqs[i];
 608                 unsigned int virq = 0;
 609
 610                 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
 611                 if (virq <= 0)
 612                         return -EINVAL;
 613                 muic_irq->virq = virq;
 614
 615                 ret = devm_request_threaded_irq(info->dev, virq, NULL,
 616                                                 sm5502_muic_irq_handler,
 617                                                 IRQF_NO_SUSPEND,
 618                                                 muic_irq->name, info);
 619                 if (ret) {
 620                         dev_err(info->dev, "failed: irq request (IRQ: %d,"
 621                                 " error :%d)\n", muic_irq->irq, ret);
 622                         return ret;
 623                 }
 624         }
 625
 626         /* Allocate extcon device */
 627         info->edev = devm_extcon_dev_allocate(info->dev, sm5502_extcon_cable);
 628         if (IS_ERR(info->edev)) {
 629                 dev_err(info->dev, "failed to allocate memory for extcon\n");
 630                 return -ENOMEM;
 631         }
 632         info->edev->name = np->name;
 633
 634         /* Register extcon device */
 635         ret = devm_extcon_dev_register(info->dev, info->edev);
 636         if (ret) {
 637                 dev_err(info->dev, "failed to register extcon device\n");
 638                 return ret;
 639         }
 640
 641         /*
 642          * Detect accessory after completing the initialization of platform
 643          *
 644          * - Use delayed workqueue to detect cable state and then
 645          * notify cable state to notifiee/platform through uevent.
 646          * After completing the booting of platform, the extcon provider
 647          * driver should notify cable state to upper layer.
 648          */
 649         INIT_DELAYED_WORK(&info->wq_detcable, sm5502_muic_detect_cable_wq);
 650         queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 651                         msecs_to_jiffies(DELAY_MS_DEFAULT));
 652
 653         /* Initialize SM5502 device and print vendor id and version id */
 654         sm5502_init_dev_type(info);
 655
 656         return 0;
 657 }
 658
 659 static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
 660 {
 661         struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
 662
 663         regmap_del_irq_chip(info->irq, info->irq_data);
 664
 665         return 0;
 666 }
 667
 668 static struct of_device_id sm5502_dt_match[] = {
 669         { .compatible = "siliconmitus,sm5502-muic" },
 670         { },
 671 };
 672
 673 #ifdef CONFIG_PM_SLEEP
 674 static int sm5502_muic_suspend(struct device *dev)
 675 {
 676         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 677         struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
 678
 679         enable_irq_wake(info->irq);
 680
 681         return 0;
 682 }
 683
 684 static int sm5502_muic_resume(struct device *dev)
 685 {
 686         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 687         struct sm5502_muic_info *info = i2c_get_clientdata(i2c);
 688
 689         disable_irq_wake(info->irq);
 690
 691         return 0;
 692 }
 693 #endif
 694
 695 static SIMPLE_DEV_PM_OPS(sm5502_muic_pm_ops,
 696                          sm5502_muic_suspend, sm5502_muic_resume);
 697
 698 static const struct i2c_device_id sm5502_i2c_id[] = {
 699         { "sm5502", TYPE_SM5502 },
 700         { }
 701 };
 702 MODULE_DEVICE_TABLE(i2c, sm5502_i2c_id);
 703
 704 static struct i2c_driver sm5502_muic_i2c_driver = {
 705         .driver         = {
 706                 .name   = "sm5502",
 707                 .owner  = THIS_MODULE,
 708                 .pm     = &sm5502_muic_pm_ops,
 709                 .of_match_table = sm5502_dt_match,
 710         },
 711         .probe  = sm5022_muic_i2c_probe,
 712         .remove = sm5502_muic_i2c_remove,
 713         .id_table = sm5502_i2c_id,
 714 };
 715
 716 static int __init sm5502_muic_i2c_init(void)
 717 {
 718         return i2c_add_driver(&sm5502_muic_i2c_driver);
 719 }
 720 subsys_initcall(sm5502_muic_i2c_init);
 721
 722 MODULE_DESCRIPTION("Silicon Mitus SM5502 Extcon driver");
 723 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 724 MODULE_LICENSE("GPL");