drivers/extcon/extcon.c

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