drivers/extcon/extcon.c

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