drivers/extcon/extcon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * drivers/extcon/extcon.c - External Connector (extcon) framework.
   4  *
   5  * Copyright (C) 2015 Samsung Electronics
   6  * Author: Chanwoo Choi <cw00.choi@samsung.com>
   7  *
   8  * Copyright (C) 2012 Samsung Electronics
   9  * Author: Donggeun Kim <dg77.kim@samsung.com>
  10  * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
  11  *
  12  * based on android/drivers/switch/switch_class.c
  13  * Copyright (C) 2008 Google, Inc.
  14  * Author: Mike Lockwood <lockwood@android.com>
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/idr.h>
  20 #include <linux/init.h>
  21 #include <linux/device.h>
  22 #include <linux/fs.h>
  23 #include <linux/err.h>
  24 #include <linux/of.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysfs.h>
  27
  28 #include "extcon.h"
  29
  30 #define SUPPORTED_CABLE_MAX     32
  31
  32 static const struct __extcon_info {
  33         unsigned int type;
  34         unsigned int id;
  35         const char *name;
  36
  37 } extcon_info[] = {
  38         [EXTCON_NONE] = {
  39                 .type = EXTCON_TYPE_MISC,
  40                 .id = EXTCON_NONE,
  41                 .name = "NONE",
  42         },
  43
  44         /* USB external connector */
  45         [EXTCON_USB] = {
  46                 .type = EXTCON_TYPE_USB,
  47                 .id = EXTCON_USB,
  48                 .name = "USB",
  49         },
  50         [EXTCON_USB_HOST] = {
  51                 .type = EXTCON_TYPE_USB,
  52                 .id = EXTCON_USB_HOST,
  53                 .name = "USB-HOST",
  54         },
  55
  56         /* Charging external connector */
  57         [EXTCON_CHG_USB_SDP] = {
  58                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  59                 .id = EXTCON_CHG_USB_SDP,
  60                 .name = "SDP",
  61         },
  62         [EXTCON_CHG_USB_DCP] = {
  63                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  64                 .id = EXTCON_CHG_USB_DCP,
  65                 .name = "DCP",
  66         },
  67         [EXTCON_CHG_USB_CDP] = {
  68                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  69                 .id = EXTCON_CHG_USB_CDP,
  70                 .name = "CDP",
  71         },
  72         [EXTCON_CHG_USB_ACA] = {
  73                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  74                 .id = EXTCON_CHG_USB_ACA,
  75                 .name = "ACA",
  76         },
  77         [EXTCON_CHG_USB_FAST] = {
  78                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  79                 .id = EXTCON_CHG_USB_FAST,
  80                 .name = "FAST-CHARGER",
  81         },
  82         [EXTCON_CHG_USB_SLOW] = {
  83                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  84                 .id = EXTCON_CHG_USB_SLOW,
  85                 .name = "SLOW-CHARGER",
  86         },
  87         [EXTCON_CHG_WPT] = {
  88                 .type = EXTCON_TYPE_CHG,
  89                 .id = EXTCON_CHG_WPT,
  90                 .name = "WPT",
  91         },
  92         [EXTCON_CHG_USB_PD] = {
  93                 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
  94                 .id = EXTCON_CHG_USB_PD,
  95                 .name = "PD",
  96         },
  97
  98         /* Jack external connector */
  99         [EXTCON_JACK_MICROPHONE] = {
 100                 .type = EXTCON_TYPE_JACK,
 101                 .id = EXTCON_JACK_MICROPHONE,
 102                 .name = "MICROPHONE",
 103         },
 104         [EXTCON_JACK_HEADPHONE] = {
 105                 .type = EXTCON_TYPE_JACK,
 106                 .id = EXTCON_JACK_HEADPHONE,
 107                 .name = "HEADPHONE",
 108         },
 109         [EXTCON_JACK_LINE_IN] = {
 110                 .type = EXTCON_TYPE_JACK,
 111                 .id = EXTCON_JACK_LINE_IN,
 112                 .name = "LINE-IN",
 113         },
 114         [EXTCON_JACK_LINE_OUT] = {
 115                 .type = EXTCON_TYPE_JACK,
 116                 .id = EXTCON_JACK_LINE_OUT,
 117                 .name = "LINE-OUT",
 118         },
 119         [EXTCON_JACK_VIDEO_IN] = {
 120                 .type = EXTCON_TYPE_JACK,
 121                 .id = EXTCON_JACK_VIDEO_IN,
 122                 .name = "VIDEO-IN",
 123         },
 124         [EXTCON_JACK_VIDEO_OUT] = {
 125                 .type = EXTCON_TYPE_JACK,
 126                 .id = EXTCON_JACK_VIDEO_OUT,
 127                 .name = "VIDEO-OUT",
 128         },
 129         [EXTCON_JACK_SPDIF_IN] = {
 130                 .type = EXTCON_TYPE_JACK,
 131                 .id = EXTCON_JACK_SPDIF_IN,
 132                 .name = "SPDIF-IN",
 133         },
 134         [EXTCON_JACK_SPDIF_OUT] = {
 135                 .type = EXTCON_TYPE_JACK,
 136                 .id = EXTCON_JACK_SPDIF_OUT,
 137                 .name = "SPDIF-OUT",
 138         },
 139
 140         /* Display external connector */
 141         [EXTCON_DISP_HDMI] = {
 142                 .type = EXTCON_TYPE_DISP,
 143                 .id = EXTCON_DISP_HDMI,
 144                 .name = "HDMI",
 145         },
 146         [EXTCON_DISP_MHL] = {
 147                 .type = EXTCON_TYPE_DISP,
 148                 .id = EXTCON_DISP_MHL,
 149                 .name = "MHL",
 150         },
 151         [EXTCON_DISP_DVI] = {
 152                 .type = EXTCON_TYPE_DISP,
 153                 .id = EXTCON_DISP_DVI,
 154                 .name = "DVI",
 155         },
 156         [EXTCON_DISP_VGA] = {
 157                 .type = EXTCON_TYPE_DISP,
 158                 .id = EXTCON_DISP_VGA,
 159                 .name = "VGA",
 160         },
 161         [EXTCON_DISP_DP] = {
 162                 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
 163                 .id = EXTCON_DISP_DP,
 164                 .name = "DP",
 165         },
 166         [EXTCON_DISP_HMD] = {
 167                 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
 168                 .id = EXTCON_DISP_HMD,
 169                 .name = "HMD",
 170         },
 171         [EXTCON_DISP_CVBS] = {
 172                 .type = EXTCON_TYPE_DISP,
 173                 .id = EXTCON_DISP_CVBS,
 174                 .name = "CVBS",
 175         },
 176         [EXTCON_DISP_EDP] = {
 177                 .type = EXTCON_TYPE_DISP,
 178                 .id = EXTCON_DISP_EDP,
 179                 .name = "EDP",
 180         },
 181
 182         /* Miscellaneous external connector */
 183         [EXTCON_DOCK] = {
 184                 .type = EXTCON_TYPE_MISC,
 185                 .id = EXTCON_DOCK,
 186                 .name = "DOCK",
 187         },
 188         [EXTCON_JIG] = {
 189                 .type = EXTCON_TYPE_MISC,
 190                 .id = EXTCON_JIG,
 191                 .name = "JIG",
 192         },
 193         [EXTCON_MECHANICAL] = {
 194                 .type = EXTCON_TYPE_MISC,
 195                 .id = EXTCON_MECHANICAL,
 196                 .name = "MECHANICAL",
 197         },
 198
 199         { /* sentinel */ }
 200 };
 201
 202 /**
 203  * struct extcon_cable - An internal data for an external connector.
 204  * @edev:               the extcon device
 205  * @cable_index:        the index of this cable in the edev
 206  * @attr_g:             the attribute group for the cable
 207  * @attr_name:          "name" sysfs entry
 208  * @attr_state:         "state" sysfs entry
 209  * @attrs:              the array pointing to attr_name and attr_state for attr_g
 210  * @usb_propval:        the array of USB connector properties
 211  * @chg_propval:        the array of charger connector properties
 212  * @jack_propval:       the array of jack connector properties
 213  * @disp_propval:       the array of display connector properties
 214  * @usb_bits:           the bit array of the USB connector property capabilities
 215  * @chg_bits:           the bit array of the charger connector property capabilities
 216  * @jack_bits:          the bit array of the jack connector property capabilities
 217  * @disp_bits:          the bit array of the display connector property capabilities
 218  */
 219 struct extcon_cable {
 220         struct extcon_dev *edev;
 221         int cable_index;
 222
 223         struct attribute_group attr_g;
 224         struct device_attribute attr_name;
 225         struct device_attribute attr_state;
 226
 227         struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
 228
 229         union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
 230         union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
 231         union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
 232         union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
 233
 234         DECLARE_BITMAP(usb_bits, EXTCON_PROP_USB_CNT);
 235         DECLARE_BITMAP(chg_bits, EXTCON_PROP_CHG_CNT);
 236         DECLARE_BITMAP(jack_bits, EXTCON_PROP_JACK_CNT);
 237         DECLARE_BITMAP(disp_bits, EXTCON_PROP_DISP_CNT);
 238 };
 239
 240 static struct class *extcon_class;
 241
 242 static DEFINE_IDA(extcon_dev_ids);
 243 static LIST_HEAD(extcon_dev_list);
 244 static DEFINE_MUTEX(extcon_dev_list_lock);
 245
 246 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
 247 {
 248         int i;
 249
 250         if (!edev->mutually_exclusive)
 251                 return 0;
 252
 253         for (i = 0; edev->mutually_exclusive[i]; i++) {
 254                 int weight;
 255                 u32 correspondants = new_state & edev->mutually_exclusive[i];
 256
 257                 /* calculate the total number of bits set */
 258                 weight = hweight32(correspondants);
 259                 if (weight > 1)
 260                         return i + 1;
 261         }
 262
 263         return 0;
 264 }
 265
 266 static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
 267 {
 268         int i;
 269
 270         /* Find the index of extcon cable in edev->supported_cable */
 271         for (i = 0; i < edev->max_supported; i++) {
 272                 if (edev->supported_cable[i] == id)
 273                         return i;
 274         }
 275
 276         return -EINVAL;
 277 }
 278
 279 static int get_extcon_type(unsigned int prop)
 280 {
 281         switch (prop) {
 282         case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
 283                 return EXTCON_TYPE_USB;
 284         case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
 285                 return EXTCON_TYPE_CHG;
 286         case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
 287                 return EXTCON_TYPE_JACK;
 288         case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
 289                 return EXTCON_TYPE_DISP;
 290         default:
 291                 return -EINVAL;
 292         }
 293 }
 294
 295 static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
 296 {
 297         return !!(edev->state & BIT(index));
 298 }
 299
 300 static bool is_extcon_changed(struct extcon_dev *edev, int index,
 301                                 bool new_state)
 302 {
 303         int state = !!(edev->state & BIT(index));
 304         return (state != new_state);
 305 }
 306
 307 static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
 308 {
 309         int type;
 310
 311         /* Check whether the property is supported or not. */
 312         type = get_extcon_type(prop);
 313         if (type < 0)
 314                 return false;
 315
 316         /* Check whether a specific extcon id supports the property or not. */
 317         return !!(extcon_info[id].type & type);
 318 }
 319
 320 static int is_extcon_property_capability(struct extcon_dev *edev,
 321                                 unsigned int id, int index,unsigned int prop)
 322 {
 323         struct extcon_cable *cable;
 324         int type, ret;
 325
 326         /* Check whether the property is supported or not. */
 327         type = get_extcon_type(prop);
 328         if (type < 0)
 329                 return type;
 330
 331         cable = &edev->cables[index];
 332
 333         switch (type) {
 334         case EXTCON_TYPE_USB:
 335                 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
 336                 break;
 337         case EXTCON_TYPE_CHG:
 338                 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
 339                 break;
 340         case EXTCON_TYPE_JACK:
 341                 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
 342                 break;
 343         case EXTCON_TYPE_DISP:
 344                 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
 345                 break;
 346         default:
 347                 ret = -EINVAL;
 348         }
 349
 350         return ret;
 351 }
 352
 353 static void init_property(struct extcon_dev *edev, unsigned int id, int index)
 354 {
 355         unsigned int type = extcon_info[id].type;
 356         struct extcon_cable *cable = &edev->cables[index];
 357
 358         if (EXTCON_TYPE_USB & type)
 359                 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
 360         if (EXTCON_TYPE_CHG & type)
 361                 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
 362         if (EXTCON_TYPE_JACK & type)
 363                 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
 364         if (EXTCON_TYPE_DISP & type)
 365                 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
 366 }
 367
 368 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 369                           char *buf)
 370 {
 371         int i, count = 0;
 372         struct extcon_dev *edev = dev_get_drvdata(dev);
 373
 374         if (edev->max_supported == 0)
 375                 return sysfs_emit(buf, "%u\n", edev->state);
 376
 377         for (i = 0; i < edev->max_supported; i++) {
 378                 count += sysfs_emit_at(buf, count, "%s=%d\n",
 379                                        extcon_info[edev->supported_cable[i]].name,
 380                                        !!(edev->state & BIT(i)));
 381         }
 382
 383         return count;
 384 }
 385 static DEVICE_ATTR_RO(state);
 386
 387 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 388                 char *buf)
 389 {
 390         struct extcon_dev *edev = dev_get_drvdata(dev);
 391
 392         return sysfs_emit(buf, "%s\n", edev->name);
 393 }
 394 static DEVICE_ATTR_RO(name);
 395
 396 static ssize_t cable_name_show(struct device *dev,
 397                                struct device_attribute *attr, char *buf)
 398 {
 399         struct extcon_cable *cable = container_of(attr, struct extcon_cable,
 400                                                   attr_name);
 401         int i = cable->cable_index;
 402
 403         return sysfs_emit(buf, "%s\n",
 404                           extcon_info[cable->edev->supported_cable[i]].name);
 405 }
 406
 407 static ssize_t cable_state_show(struct device *dev,
 408                                 struct device_attribute *attr, char *buf)
 409 {
 410         struct extcon_cable *cable = container_of(attr, struct extcon_cable,
 411                                                   attr_state);
 412
 413         int i = cable->cable_index;
 414
 415         return sysfs_emit(buf, "%d\n",
 416                           extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
 417 }
 418
 419 /**
 420  * extcon_sync() - Synchronize the state for an external connector.
 421  * @edev:       the extcon device
 422  * @id:         the unique id indicating an external connector
 423  *
 424  * Note that this function send a notification in order to synchronize
 425  * the state and property of an external connector.
 426  *
 427  * Returns 0 if success or error number if fail.
 428  */
 429 int extcon_sync(struct extcon_dev *edev, unsigned int id)
 430 {
 431         char name_buf[120];
 432         char state_buf[120];
 433         char *prop_buf;
 434         char *envp[3];
 435         int env_offset = 0;
 436         int length;
 437         int index;
 438         int state;
 439         unsigned long flags;
 440
 441         if (!edev)
 442                 return -EINVAL;
 443
 444         index = find_cable_index_by_id(edev, id);
 445         if (index < 0)
 446                 return index;
 447
 448         spin_lock_irqsave(&edev->lock, flags);
 449         state = !!(edev->state & BIT(index));
 450         spin_unlock_irqrestore(&edev->lock, flags);
 451
 452         /*
 453          * Call functions in a raw notifier chain for the specific one
 454          * external connector.
 455          */
 456         raw_notifier_call_chain(&edev->nh[index], state, edev);
 457
 458         /*
 459          * Call functions in a raw notifier chain for the all supported
 460          * external connectors.
 461          */
 462         raw_notifier_call_chain(&edev->nh_all, state, edev);
 463
 464         spin_lock_irqsave(&edev->lock, flags);
 465         /* This could be in interrupt handler */
 466         prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
 467         if (!prop_buf) {
 468                 /* Unlock early before uevent */
 469                 spin_unlock_irqrestore(&edev->lock, flags);
 470
 471                 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
 472                 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
 473
 474                 return -ENOMEM;
 475         }
 476
 477         length = name_show(&edev->dev, NULL, prop_buf);
 478         if (length > 0) {
 479                 if (prop_buf[length - 1] == '\n')
 480                         prop_buf[length - 1] = 0;
 481                 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
 482                 envp[env_offset++] = name_buf;
 483         }
 484
 485         length = state_show(&edev->dev, NULL, prop_buf);
 486         if (length > 0) {
 487                 if (prop_buf[length - 1] == '\n')
 488                         prop_buf[length - 1] = 0;
 489                 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
 490                 envp[env_offset++] = state_buf;
 491         }
 492         envp[env_offset] = NULL;
 493
 494         /* Unlock early before uevent */
 495         spin_unlock_irqrestore(&edev->lock, flags);
 496         kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
 497         free_page((unsigned long)prop_buf);
 498
 499         return 0;
 500 }
 501 EXPORT_SYMBOL_GPL(extcon_sync);
 502
 503 /**
 504  * extcon_get_state() - Get the state of an external connector.
 505  * @edev:       the extcon device
 506  * @id:         the unique id indicating an external connector
 507  *
 508  * Returns 0 if success or error number if fail.
 509  */
 510 int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
 511 {
 512         int index, state;
 513         unsigned long flags;
 514
 515         if (!edev)
 516                 return -EINVAL;
 517
 518         index = find_cable_index_by_id(edev, id);
 519         if (index < 0)
 520                 return index;
 521
 522         spin_lock_irqsave(&edev->lock, flags);
 523         state = is_extcon_attached(edev, index);
 524         spin_unlock_irqrestore(&edev->lock, flags);
 525
 526         return state;
 527 }
 528 EXPORT_SYMBOL_GPL(extcon_get_state);
 529
 530 /**
 531  * extcon_set_state() - Set the state of an external connector.
 532  * @edev:       the extcon device
 533  * @id:         the unique id indicating an external connector
 534  * @state:      the new state of an external connector.
 535  *              the default semantics is true: attached / false: detached.
 536  *
 537  * Note that this function set the state of an external connector without
 538  * a notification. To synchronize the state of an external connector,
 539  * have to use extcon_set_state_sync() and extcon_sync().
 540  *
 541  * Returns 0 if success or error number if fail.
 542  */
 543 int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
 544 {
 545         unsigned long flags;
 546         int index, ret = 0;
 547
 548         if (!edev)
 549                 return -EINVAL;
 550
 551         index = find_cable_index_by_id(edev, id);
 552         if (index < 0)
 553                 return index;
 554
 555         spin_lock_irqsave(&edev->lock, flags);
 556
 557         /* Check whether the external connector's state is changed. */
 558         if (!is_extcon_changed(edev, index, state))
 559                 goto out;
 560
 561         if (check_mutually_exclusive(edev,
 562                 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
 563                 ret = -EPERM;
 564                 goto out;
 565         }
 566
 567         /*
 568          * Initialize the value of extcon property before setting
 569          * the detached state for an external connector.
 570          */
 571         if (!state)
 572                 init_property(edev, id, index);
 573
 574         /* Update the state for an external connector. */
 575         if (state)
 576                 edev->state |= BIT(index);
 577         else
 578                 edev->state &= ~(BIT(index));
 579 out:
 580         spin_unlock_irqrestore(&edev->lock, flags);
 581
 582         return ret;
 583 }
 584 EXPORT_SYMBOL_GPL(extcon_set_state);
 585
 586 /**
 587  * extcon_set_state_sync() - Set the state of an external connector with sync.
 588  * @edev:       the extcon device
 589  * @id:         the unique id indicating an external connector
 590  * @state:      the new state of external connector.
 591  *              the default semantics is true: attached / false: detached.
 592  *
 593  * Note that this function set the state of external connector
 594  * and synchronize the state by sending a notification.
 595  *
 596  * Returns 0 if success or error number if fail.
 597  */
 598 int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
 599 {
 600         int ret;
 601
 602         ret = extcon_set_state(edev, id, state);
 603         if (ret < 0)
 604                 return ret;
 605
 606         return extcon_sync(edev, id);
 607 }
 608 EXPORT_SYMBOL_GPL(extcon_set_state_sync);
 609
 610 /**
 611  * extcon_get_property() - Get the property value of an external connector.
 612  * @edev:       the extcon device
 613  * @id:         the unique id indicating an external connector
 614  * @prop:       the property id indicating an extcon property
 615  * @prop_val:   the pointer which store the value of extcon property
 616  *
 617  * Note that when getting the property value of external connector,
 618  * the external connector should be attached. If detached state, function
 619  * return 0 without property value. Also, the each property should be
 620  * included in the list of supported properties according to extcon type.
 621  *
 622  * Returns 0 if success or error number if fail.
 623  */
 624 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
 625                                 unsigned int prop,
 626                                 union extcon_property_value *prop_val)
 627 {
 628         struct extcon_cable *cable;
 629         unsigned long flags;
 630         int index, ret = 0;
 631
 632         *prop_val = (union extcon_property_value){0};
 633
 634         if (!edev)
 635                 return -EINVAL;
 636
 637         /* Check whether the property is supported or not */
 638         if (!is_extcon_property_supported(id, prop))
 639                 return -EINVAL;
 640
 641         /* Find the cable index of external connector by using id */
 642         index = find_cable_index_by_id(edev, id);
 643         if (index < 0)
 644                 return index;
 645
 646         spin_lock_irqsave(&edev->lock, flags);
 647
 648         /* Check whether the property is available or not. */
 649         if (!is_extcon_property_capability(edev, id, index, prop)) {
 650                 spin_unlock_irqrestore(&edev->lock, flags);
 651                 return -EPERM;
 652         }
 653
 654         /*
 655          * Check whether the external connector is attached.
 656          * If external connector is detached, the user can not
 657          * get the property value.
 658          */
 659         if (!is_extcon_attached(edev, index)) {
 660                 spin_unlock_irqrestore(&edev->lock, flags);
 661                 return 0;
 662         }
 663
 664         cable = &edev->cables[index];
 665
 666         /* Get the property value according to extcon type */
 667         switch (prop) {
 668         case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
 669                 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
 670                 break;
 671         case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
 672                 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
 673                 break;
 674         case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
 675                 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
 676                 break;
 677         case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
 678                 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
 679                 break;
 680         default:
 681                 ret = -EINVAL;
 682                 break;
 683         }
 684
 685         spin_unlock_irqrestore(&edev->lock, flags);
 686
 687         return ret;
 688 }
 689 EXPORT_SYMBOL_GPL(extcon_get_property);
 690
 691 /**
 692  * extcon_set_property() - Set the property value of an external connector.
 693  * @edev:       the extcon device
 694  * @id:         the unique id indicating an external connector
 695  * @prop:       the property id indicating an extcon property
 696  * @prop_val:   the pointer including the new value of extcon property
 697  *
 698  * Note that each property should be included in the list of supported
 699  * properties according to the extcon type.
 700  *
 701  * Returns 0 if success or error number if fail.
 702  */
 703 int extcon_set_property(struct extcon_dev *edev, unsigned int id,
 704                                 unsigned int prop,
 705                                 union extcon_property_value prop_val)
 706 {
 707         struct extcon_cable *cable;
 708         unsigned long flags;
 709         int index, ret = 0;
 710
 711         if (!edev)
 712                 return -EINVAL;
 713
 714         /* Check whether the property is supported or not */
 715         if (!is_extcon_property_supported(id, prop))
 716                 return -EINVAL;
 717
 718         /* Find the cable index of external connector by using id */
 719         index = find_cable_index_by_id(edev, id);
 720         if (index < 0)
 721                 return index;
 722
 723         spin_lock_irqsave(&edev->lock, flags);
 724
 725         /* Check whether the property is available or not. */
 726         if (!is_extcon_property_capability(edev, id, index, prop)) {
 727                 spin_unlock_irqrestore(&edev->lock, flags);
 728                 return -EPERM;
 729         }
 730
 731         cable = &edev->cables[index];
 732
 733         /* Set the property value according to extcon type */
 734         switch (prop) {
 735         case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
 736                 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
 737                 break;
 738         case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
 739                 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
 740                 break;
 741         case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
 742                 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
 743                 break;
 744         case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
 745                 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
 746                 break;
 747         default:
 748                 ret = -EINVAL;
 749                 break;
 750         }
 751
 752         spin_unlock_irqrestore(&edev->lock, flags);
 753
 754         return ret;
 755 }
 756 EXPORT_SYMBOL_GPL(extcon_set_property);
 757
 758 /**
 759  * extcon_set_property_sync() - Set property of an external connector with sync.
 760  * @edev:       the extcon device
 761  * @id:         the unique id indicating an external connector
 762  * @prop:       the property id indicating an extcon property
 763  * @prop_val:   the pointer including the new value of extcon property
 764  *
 765  * Note that when setting the property value of external connector,
 766  * the external connector should be attached. The each property should
 767  * be included in the list of supported properties according to extcon type.
 768  *
 769  * Returns 0 if success or error number if fail.
 770  */
 771 int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
 772                                 unsigned int prop,
 773                                 union extcon_property_value prop_val)
 774 {
 775         int ret;
 776
 777         ret = extcon_set_property(edev, id, prop, prop_val);
 778         if (ret < 0)
 779                 return ret;
 780
 781         return extcon_sync(edev, id);
 782 }
 783 EXPORT_SYMBOL_GPL(extcon_set_property_sync);
 784
 785 /**
 786  * extcon_get_property_capability() - Get the capability of the property
 787  *                                      for an external connector.
 788  * @edev:       the extcon device
 789  * @id:         the unique id indicating an external connector
 790  * @prop:       the property id indicating an extcon property
 791  *
 792  * Returns 1 if the property is available or 0 if not available.
 793  */
 794 int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
 795                                         unsigned int prop)
 796 {
 797         int index;
 798
 799         if (!edev)
 800                 return -EINVAL;
 801
 802         /* Check whether the property is supported or not */
 803         if (!is_extcon_property_supported(id, prop))
 804                 return -EINVAL;
 805
 806         /* Find the cable index of external connector by using id */
 807         index = find_cable_index_by_id(edev, id);
 808         if (index < 0)
 809                 return index;
 810
 811         return is_extcon_property_capability(edev, id, index, prop);
 812 }
 813 EXPORT_SYMBOL_GPL(extcon_get_property_capability);
 814
 815 /**
 816  * extcon_set_property_capability() - Set the capability of the property
 817  *                                      for an external connector.
 818  * @edev:       the extcon device
 819  * @id:         the unique id indicating an external connector
 820  * @prop:       the property id indicating an extcon property
 821  *
 822  * Note that this function set the capability of the property
 823  * for an external connector in order to mark the bit in capability
 824  * bitmap which mean the available state of the property.
 825  *
 826  * Returns 0 if success or error number if fail.
 827  */
 828 int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
 829                                         unsigned int prop)
 830 {
 831         struct extcon_cable *cable;
 832         int index, type, ret = 0;
 833
 834         if (!edev)
 835                 return -EINVAL;
 836
 837         /* Check whether the property is supported or not. */
 838         if (!is_extcon_property_supported(id, prop))
 839                 return -EINVAL;
 840
 841         /* Find the cable index of external connector by using id. */
 842         index = find_cable_index_by_id(edev, id);
 843         if (index < 0)
 844                 return index;
 845
 846         type = get_extcon_type(prop);
 847         if (type < 0)
 848                 return type;
 849
 850         cable = &edev->cables[index];
 851
 852         switch (type) {
 853         case EXTCON_TYPE_USB:
 854                 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
 855                 break;
 856         case EXTCON_TYPE_CHG:
 857                 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
 858                 break;
 859         case EXTCON_TYPE_JACK:
 860                 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
 861                 break;
 862         case EXTCON_TYPE_DISP:
 863                 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
 864                 break;
 865         default:
 866                 ret = -EINVAL;
 867         }
 868
 869         return ret;
 870 }
 871 EXPORT_SYMBOL_GPL(extcon_set_property_capability);
 872
 873 /**
 874  * extcon_get_extcon_dev() - Get the extcon device instance from the name.
 875  * @extcon_name:        the extcon name provided with extcon_dev_register()
 876  *
 877  * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
 878  * NOTE: This function returns -EPROBE_DEFER so it may only be called from
 879  * probe() functions.
 880  */
 881 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
 882 {
 883         struct extcon_dev *sd;
 884
 885         if (!extcon_name)
 886                 return ERR_PTR(-EINVAL);
 887
 888         mutex_lock(&extcon_dev_list_lock);
 889         list_for_each_entry(sd, &extcon_dev_list, entry) {
 890                 if (!strcmp(sd->name, extcon_name))
 891                         goto out;
 892         }
 893         sd = ERR_PTR(-EPROBE_DEFER);
 894 out:
 895         mutex_unlock(&extcon_dev_list_lock);
 896         return sd;
 897 }
 898 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
 899
 900 /**
 901  * extcon_register_notifier() - Register a notifier block to get notified by
 902  *                              any state changes from the extcon.
 903  * @edev:       the extcon device
 904  * @id:         the unique id indicating an external connector
 905  * @nb:         a notifier block to be registered
 906  *
 907  * Note that the second parameter given to the callback of nb (val) is
 908  * the current state of an external connector and the third pameter
 909  * is the pointer of extcon device.
 910  *
 911  * Returns 0 if success or error number if fail.
 912  */
 913 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
 914                              struct notifier_block *nb)
 915 {
 916         unsigned long flags;
 917         int ret, idx;
 918
 919         if (!edev || !nb)
 920                 return -EINVAL;
 921
 922         idx = find_cable_index_by_id(edev, id);
 923         if (idx < 0)
 924                 return idx;
 925
 926         spin_lock_irqsave(&edev->lock, flags);
 927         ret = raw_notifier_chain_register(&edev->nh[idx], nb);
 928         spin_unlock_irqrestore(&edev->lock, flags);
 929
 930         return ret;
 931 }
 932 EXPORT_SYMBOL_GPL(extcon_register_notifier);
 933
 934 /**
 935  * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
 936  * @edev:       the extcon device
 937  * @id:         the unique id indicating an external connector
 938  * @nb:         a notifier block to be registered
 939  *
 940  * Returns 0 if success or error number if fail.
 941  */
 942 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
 943                                 struct notifier_block *nb)
 944 {
 945         unsigned long flags;
 946         int ret, idx;
 947
 948         if (!edev || !nb)
 949                 return -EINVAL;
 950
 951         idx = find_cable_index_by_id(edev, id);
 952         if (idx < 0)
 953                 return idx;
 954
 955         spin_lock_irqsave(&edev->lock, flags);
 956         ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
 957         spin_unlock_irqrestore(&edev->lock, flags);
 958
 959         return ret;
 960 }
 961 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
 962
 963 /**
 964  * extcon_register_notifier_all() - Register a notifier block for all connectors.
 965  * @edev:       the extcon device
 966  * @nb:         a notifier block to be registered
 967  *
 968  * Note that this function registers a notifier block in order to receive
 969  * the state change of all supported external connectors from extcon device.
 970  * And the second parameter given to the callback of nb (val) is
 971  * the current state and the third pameter is the pointer of extcon device.
 972  *
 973  * Returns 0 if success or error number if fail.
 974  */
 975 int extcon_register_notifier_all(struct extcon_dev *edev,
 976                                 struct notifier_block *nb)
 977 {
 978         unsigned long flags;
 979         int ret;
 980
 981         if (!edev || !nb)
 982                 return -EINVAL;
 983
 984         spin_lock_irqsave(&edev->lock, flags);
 985         ret = raw_notifier_chain_register(&edev->nh_all, nb);
 986         spin_unlock_irqrestore(&edev->lock, flags);
 987
 988         return ret;
 989 }
 990 EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
 991
 992 /**
 993  * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
 994  * @edev:       the extcon device
 995  * @nb:         a notifier block to be registered
 996  *
 997  * Returns 0 if success or error number if fail.
 998  */
 999 int extcon_unregister_notifier_all(struct extcon_dev *edev,
1000                                 struct notifier_block *nb)
1001 {
1002         unsigned long flags;
1003         int ret;
1004
1005         if (!edev || !nb)
1006                 return -EINVAL;
1007
1008         spin_lock_irqsave(&edev->lock, flags);
1009         ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
1010         spin_unlock_irqrestore(&edev->lock, flags);
1011
1012         return ret;
1013 }
1014 EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1015
1016 static struct attribute *extcon_attrs[] = {
1017         &dev_attr_state.attr,
1018         &dev_attr_name.attr,
1019         NULL,
1020 };
1021 ATTRIBUTE_GROUPS(extcon);
1022
1023 static int create_extcon_class(void)
1024 {
1025         if (extcon_class)
1026                 return 0;
1027
1028         extcon_class = class_create("extcon");
1029         if (IS_ERR(extcon_class))
1030                 return PTR_ERR(extcon_class);
1031         extcon_class->dev_groups = extcon_groups;
1032
1033         return 0;
1034 }
1035
1036 static void extcon_dev_release(struct device *dev)
1037 {
1038 }
1039
1040 static const char *muex_name = "mutually_exclusive";
1041 static void dummy_sysfs_dev_release(struct device *dev)
1042 {
1043 }
1044
1045 /*
1046  * extcon_dev_allocate() - Allocate the memory of extcon device.
1047  * @supported_cable:    the array of the supported external connectors
1048  *                      ending with EXTCON_NONE.
1049  *
1050  * Note that this function allocates the memory for extcon device
1051  * and initialize default setting for the extcon device.
1052  *
1053  * Returns the pointer memory of allocated extcon_dev if success
1054  * or ERR_PTR(err) if fail.
1055  */
1056 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1057 {
1058         struct extcon_dev *edev;
1059
1060         if (!supported_cable)
1061                 return ERR_PTR(-EINVAL);
1062
1063         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1064         if (!edev)
1065                 return ERR_PTR(-ENOMEM);
1066
1067         edev->max_supported = 0;
1068         edev->supported_cable = supported_cable;
1069
1070         return edev;
1071 }
1072
1073 /*
1074  * extcon_dev_free() - Free the memory of extcon device.
1075  * @edev:       the extcon device
1076  */
1077 void extcon_dev_free(struct extcon_dev *edev)
1078 {
1079         kfree(edev);
1080 }
1081 EXPORT_SYMBOL_GPL(extcon_dev_free);
1082
1083 /**
1084  * extcon_alloc_cables() - alloc the cables for extcon device
1085  * @edev:       extcon device which has cables
1086  *
1087  * Returns 0 if success or error number if fail.
1088  */
1089 static int extcon_alloc_cables(struct extcon_dev *edev)
1090 {
1091         int index;
1092         char *str;
1093         struct extcon_cable *cable;
1094
1095         if (!edev)
1096                 return -EINVAL;
1097
1098         if (!edev->max_supported)
1099                 return 0;
1100
1101         edev->cables = kcalloc(edev->max_supported, sizeof(*edev->cables),
1102                                GFP_KERNEL);
1103         if (!edev->cables)
1104                 return -ENOMEM;
1105
1106         for (index = 0; index < edev->max_supported; index++) {
1107                 cable = &edev->cables[index];
1108
1109                 str = kasprintf(GFP_KERNEL, "cable.%d", index);
1110                 if (!str) {
1111                         for (index--; index >= 0; index--) {
1112                                 cable = &edev->cables[index];
1113                                 kfree(cable->attr_g.name);
1114                         }
1115
1116                         kfree(edev->cables);
1117                         return -ENOMEM;
1118                 }
1119
1120                 cable->edev = edev;
1121                 cable->cable_index = index;
1122                 cable->attrs[0] = &cable->attr_name.attr;
1123                 cable->attrs[1] = &cable->attr_state.attr;
1124                 cable->attrs[2] = NULL;
1125                 cable->attr_g.name = str;
1126                 cable->attr_g.attrs = cable->attrs;
1127
1128                 sysfs_attr_init(&cable->attr_name.attr);
1129                 cable->attr_name.attr.name = "name";
1130                 cable->attr_name.attr.mode = 0444;
1131                 cable->attr_name.show = cable_name_show;
1132
1133                 sysfs_attr_init(&cable->attr_state.attr);
1134                 cable->attr_state.attr.name = "state";
1135                 cable->attr_state.attr.mode = 0444;
1136                 cable->attr_state.show = cable_state_show;
1137         }
1138
1139         return 0;
1140 }
1141
1142 /**
1143  * extcon_alloc_muex() - alloc the mutual exclusive for extcon device
1144  * @edev:       extcon device
1145  *
1146  * Returns 0 if success or error number if fail.
1147  */
1148 static int extcon_alloc_muex(struct extcon_dev *edev)
1149 {
1150         char *name;
1151         int index;
1152
1153         if (!edev)
1154                 return -EINVAL;
1155
1156         if (!(edev->max_supported && edev->mutually_exclusive))
1157                 return 0;
1158
1159         /* Count the size of mutually_exclusive array */
1160         for (index = 0; edev->mutually_exclusive[index]; index++)
1161                 ;
1162
1163         edev->attrs_muex = kcalloc(index + 1, sizeof(*edev->attrs_muex),
1164                                    GFP_KERNEL);
1165         if (!edev->attrs_muex)
1166                 return -ENOMEM;
1167
1168         edev->d_attrs_muex = kcalloc(index, sizeof(*edev->d_attrs_muex),
1169                                      GFP_KERNEL);
1170         if (!edev->d_attrs_muex) {
1171                 kfree(edev->attrs_muex);
1172                 return -ENOMEM;
1173         }
1174
1175         for (index = 0; edev->mutually_exclusive[index]; index++) {
1176                 name = kasprintf(GFP_KERNEL, "0x%x",
1177                                  edev->mutually_exclusive[index]);
1178                 if (!name) {
1179                         for (index--; index >= 0; index--)
1180                                 kfree(edev->d_attrs_muex[index].attr.name);
1181
1182                         kfree(edev->d_attrs_muex);
1183                         kfree(edev->attrs_muex);
1184                         return -ENOMEM;
1185                 }
1186                 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1187                 edev->d_attrs_muex[index].attr.name = name;
1188                 edev->d_attrs_muex[index].attr.mode = 0000;
1189                 edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr;
1190         }
1191         edev->attr_g_muex.name = muex_name;
1192         edev->attr_g_muex.attrs = edev->attrs_muex;
1193
1194         return 0;
1195 }
1196
1197 /**
1198  * extcon_alloc_groups() - alloc the groups for extcon device
1199  * @edev:       extcon device
1200  *
1201  * Returns 0 if success or error number if fail.
1202  */
1203 static int extcon_alloc_groups(struct extcon_dev *edev)
1204 {
1205         int index;
1206
1207         if (!edev)
1208                 return -EINVAL;
1209
1210         if (!edev->max_supported)
1211                 return 0;
1212
1213         edev->extcon_dev_type.groups = kcalloc(edev->max_supported + 2,
1214                                           sizeof(*edev->extcon_dev_type.groups),
1215                                           GFP_KERNEL);
1216         if (!edev->extcon_dev_type.groups)
1217                 return -ENOMEM;
1218
1219         edev->extcon_dev_type.name = dev_name(&edev->dev);
1220         edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1221
1222         for (index = 0; index < edev->max_supported; index++)
1223                 edev->extcon_dev_type.groups[index] = &edev->cables[index].attr_g;
1224
1225         if (edev->mutually_exclusive)
1226                 edev->extcon_dev_type.groups[index] = &edev->attr_g_muex;
1227
1228         edev->dev.type = &edev->extcon_dev_type;
1229
1230         return 0;
1231 }
1232
1233 /**
1234  * extcon_dev_register() - Register an new extcon device
1235  * @edev:       the extcon device to be registered
1236  *
1237  * Among the members of edev struct, please set the "user initializing data"
1238  * do not set the values of "internal data", which are initialized by
1239  * this function.
1240  *
1241  * Note that before calling this funciton, have to allocate the memory
1242  * of an extcon device by using the extcon_dev_allocate(). And the extcon
1243  * dev should include the supported_cable information.
1244  *
1245  * Returns 0 if success or error number if fail.
1246  */
1247 int extcon_dev_register(struct extcon_dev *edev)
1248 {
1249         int ret, index;
1250
1251         ret = create_extcon_class();
1252         if (ret < 0)
1253                 return ret;
1254
1255         if (!edev || !edev->supported_cable)
1256                 return -EINVAL;
1257
1258         for (index = 0; edev->supported_cable[index] != EXTCON_NONE; index++);
1259
1260         edev->max_supported = index;
1261         if (index > SUPPORTED_CABLE_MAX) {
1262                 dev_err(&edev->dev,
1263                         "exceed the maximum number of supported cables\n");
1264                 return -EINVAL;
1265         }
1266
1267         edev->dev.class = extcon_class;
1268         edev->dev.release = extcon_dev_release;
1269
1270         edev->name = dev_name(edev->dev.parent);
1271         if (IS_ERR_OR_NULL(edev->name)) {
1272                 dev_err(&edev->dev,
1273                         "extcon device name is null\n");
1274                 return -EINVAL;
1275         }
1276
1277         ret = ida_alloc(&extcon_dev_ids, GFP_KERNEL);
1278         if (ret < 0)
1279                 return ret;
1280
1281         edev->id = ret;
1282
1283         ret = extcon_alloc_cables(edev);
1284         if (ret < 0)
1285                 goto err_alloc_cables;
1286
1287         ret = extcon_alloc_muex(edev);
1288         if (ret < 0)
1289                 goto err_alloc_muex;
1290
1291         ret = extcon_alloc_groups(edev);
1292         if (ret < 0)
1293                 goto err_alloc_groups;
1294
1295         spin_lock_init(&edev->lock);
1296         if (edev->max_supported) {
1297                 edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh),
1298                                 GFP_KERNEL);
1299                 if (!edev->nh) {
1300                         ret = -ENOMEM;
1301                         goto err_alloc_nh;
1302                 }
1303         }
1304
1305         for (index = 0; index < edev->max_supported; index++)
1306                 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1307
1308         RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1309
1310         dev_set_drvdata(&edev->dev, edev);
1311         dev_set_name(&edev->dev, "extcon%d", edev->id);
1312         edev->state = 0;
1313
1314         ret = device_register(&edev->dev);
1315         if (ret) {
1316                 put_device(&edev->dev);
1317                 goto err_dev;
1318         }
1319
1320         mutex_lock(&extcon_dev_list_lock);
1321         list_add(&edev->entry, &extcon_dev_list);
1322         mutex_unlock(&extcon_dev_list_lock);
1323
1324         return 0;
1325
1326 err_dev:
1327         if (edev->max_supported)
1328                 kfree(edev->nh);
1329 err_alloc_nh:
1330         if (edev->max_supported)
1331                 kfree(edev->extcon_dev_type.groups);
1332 err_alloc_groups:
1333         if (edev->max_supported && edev->mutually_exclusive) {
1334                 for (index = 0; edev->mutually_exclusive[index]; index++)
1335                         kfree(edev->d_attrs_muex[index].attr.name);
1336                 kfree(edev->d_attrs_muex);
1337                 kfree(edev->attrs_muex);
1338         }
1339 err_alloc_muex:
1340         for (index = 0; index < edev->max_supported; index++)
1341                 kfree(edev->cables[index].attr_g.name);
1342         if (edev->max_supported)
1343                 kfree(edev->cables);
1344 err_alloc_cables:
1345         ida_free(&extcon_dev_ids, edev->id);
1346
1347         return ret;
1348 }
1349 EXPORT_SYMBOL_GPL(extcon_dev_register);
1350
1351 /**
1352  * extcon_dev_unregister() - Unregister the extcon device.
1353  * @edev:       the extcon device to be unregistered.
1354  *
1355  * Note that this does not call kfree(edev) because edev was not allocated
1356  * by this class.
1357  */
1358 void extcon_dev_unregister(struct extcon_dev *edev)
1359 {
1360         int index;
1361
1362         if (!edev)
1363                 return;
1364
1365         mutex_lock(&extcon_dev_list_lock);
1366         list_del(&edev->entry);
1367         mutex_unlock(&extcon_dev_list_lock);
1368
1369         if (!get_device(&edev->dev)) {
1370                 dev_err(&edev->dev, "Failed to unregister extcon_dev\n");
1371                 return;
1372         }
1373
1374         ida_free(&extcon_dev_ids, edev->id);
1375
1376         device_unregister(&edev->dev);
1377
1378         if (edev->mutually_exclusive && edev->max_supported) {
1379                 for (index = 0; edev->mutually_exclusive[index];
1380                                 index++)
1381                         kfree(edev->d_attrs_muex[index].attr.name);
1382                 kfree(edev->d_attrs_muex);
1383                 kfree(edev->attrs_muex);
1384         }
1385
1386         for (index = 0; index < edev->max_supported; index++)
1387                 kfree(edev->cables[index].attr_g.name);
1388
1389         if (edev->max_supported) {
1390                 kfree(edev->extcon_dev_type.groups);
1391                 kfree(edev->cables);
1392                 kfree(edev->nh);
1393         }
1394
1395         put_device(&edev->dev);
1396 }
1397 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1398
1399 #ifdef CONFIG_OF
1400
1401 /*
1402  * extcon_find_edev_by_node - Find the extcon device from devicetree.
1403  * @node        : OF node identifying edev
1404  *
1405  * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1406  */
1407 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1408 {
1409         struct extcon_dev *edev;
1410
1411         mutex_lock(&extcon_dev_list_lock);
1412         list_for_each_entry(edev, &extcon_dev_list, entry)
1413                 if (edev->dev.parent && device_match_of_node(edev->dev.parent, node))
1414                         goto out;
1415         edev = ERR_PTR(-EPROBE_DEFER);
1416 out:
1417         mutex_unlock(&extcon_dev_list_lock);
1418
1419         return edev;
1420 }
1421
1422 /*
1423  * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1424  * @dev         : the instance to the given device
1425  * @index       : the index into list of extcon_dev
1426  *
1427  * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1428  */
1429 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1430 {
1431         struct device_node *node, *np = dev_of_node(dev);
1432         struct extcon_dev *edev;
1433
1434         if (!np) {
1435                 dev_dbg(dev, "device does not have a device node entry\n");
1436                 return ERR_PTR(-EINVAL);
1437         }
1438
1439         node = of_parse_phandle(np, "extcon", index);
1440         if (!node) {
1441                 dev_dbg(dev, "failed to get phandle in %pOF node\n", np);
1442                 return ERR_PTR(-ENODEV);
1443         }
1444
1445         edev = extcon_find_edev_by_node(node);
1446         of_node_put(node);
1447
1448         return edev;
1449 }
1450
1451 #else
1452
1453 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1454 {
1455         return ERR_PTR(-ENOSYS);
1456 }
1457
1458 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1459 {
1460         return ERR_PTR(-ENOSYS);
1461 }
1462
1463 #endif /* CONFIG_OF */
1464
1465 EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1466 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1467
1468 /**
1469  * extcon_get_edev_name() - Get the name of the extcon device.
1470  * @edev:       the extcon device
1471  */
1472 const char *extcon_get_edev_name(struct extcon_dev *edev)
1473 {
1474         return !edev ? NULL : edev->name;
1475 }
1476 EXPORT_SYMBOL_GPL(extcon_get_edev_name);
1477
1478 static int __init extcon_class_init(void)
1479 {
1480         return create_extcon_class();
1481 }
1482 module_init(extcon_class_init);
1483
1484 static void __exit extcon_class_exit(void)
1485 {
1486         class_destroy(extcon_class);
1487 }
1488 module_exit(extcon_class_exit);
1489
1490 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1491 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1492 MODULE_DESCRIPTION("External Connector (extcon) framework");
1493 MODULE_LICENSE("GPL v2");