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  * @usb_propval:        the array of USB connector properties
 208  * @chg_propval:        the array of charger connector properties
 209  * @jack_propval:       the array of jack connector properties
 210  * @disp_propval:       the array of display connector properties
 211  * @usb_bits:           the bit array of the USB connector property capabilities
 212  * @chg_bits:           the bit array of the charger connector property capabilities
 213  * @jack_bits:          the bit array of the jack connector property capabilities
 214  * @disp_bits:          the bit array of the display connector property capabilities
 215  */
 216 struct extcon_cable {
 217         struct extcon_dev *edev;
 218         int cable_index;
 219
 220         struct attribute_group attr_g;
 221         struct device_attribute attr_name;
 222         struct device_attribute attr_state;
 223
 224         struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
 225
 226         union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
 227         union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
 228         union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
 229         union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
 230
 231         unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
 232         unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
 233         unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
 234         unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
 235 };
 236
 237 static struct class *extcon_class;
 238
 239 static LIST_HEAD(extcon_dev_list);
 240 static DEFINE_MUTEX(extcon_dev_list_lock);
 241
 242 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
 243 {
 244         int i = 0;
 245
 246         if (!edev->mutually_exclusive)
 247                 return 0;
 248
 249         for (i = 0; edev->mutually_exclusive[i]; i++) {
 250                 int weight;
 251                 u32 correspondants = new_state & edev->mutually_exclusive[i];
 252
 253                 /* calculate the total number of bits set */
 254                 weight = hweight32(correspondants);
 255                 if (weight > 1)
 256                         return i + 1;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
 263 {
 264         int i;
 265
 266         /* Find the the index of extcon cable in edev->supported_cable */
 267         for (i = 0; i < edev->max_supported; i++) {
 268                 if (edev->supported_cable[i] == id)
 269                         return i;
 270         }
 271
 272         return -EINVAL;
 273 }
 274
 275 static int get_extcon_type(unsigned int prop)
 276 {
 277         switch (prop) {
 278         case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
 279                 return EXTCON_TYPE_USB;
 280         case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
 281                 return EXTCON_TYPE_CHG;
 282         case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
 283                 return EXTCON_TYPE_JACK;
 284         case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
 285                 return EXTCON_TYPE_DISP;
 286         default:
 287                 return -EINVAL;
 288         }
 289 }
 290
 291 static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
 292 {
 293         return !!(edev->state & BIT(index));
 294 }
 295
 296 static bool is_extcon_changed(struct extcon_dev *edev, int index,
 297                                 bool new_state)
 298 {
 299         int state = !!(edev->state & BIT(index));
 300         return (state != new_state);
 301 }
 302
 303 static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
 304 {
 305         int type;
 306
 307         /* Check whether the property is supported or not. */
 308         type = get_extcon_type(prop);
 309         if (type < 0)
 310                 return false;
 311
 312         /* Check whether a specific extcon id supports the property or not. */
 313         return !!(extcon_info[id].type & type);
 314 }
 315
 316 static int is_extcon_property_capability(struct extcon_dev *edev,
 317                                 unsigned int id, int index,unsigned int prop)
 318 {
 319         struct extcon_cable *cable;
 320         int type, ret;
 321
 322         /* Check whether the property is supported or not. */
 323         type = get_extcon_type(prop);
 324         if (type < 0)
 325                 return type;
 326
 327         cable = &edev->cables[index];
 328
 329         switch (type) {
 330         case EXTCON_TYPE_USB:
 331                 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
 332                 break;
 333         case EXTCON_TYPE_CHG:
 334                 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
 335                 break;
 336         case EXTCON_TYPE_JACK:
 337                 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
 338                 break;
 339         case EXTCON_TYPE_DISP:
 340                 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
 341                 break;
 342         default:
 343                 ret = -EINVAL;
 344         }
 345
 346         return ret;
 347 }
 348
 349 static void init_property(struct extcon_dev *edev, unsigned int id, int index)
 350 {
 351         unsigned int type = extcon_info[id].type;
 352         struct extcon_cable *cable = &edev->cables[index];
 353
 354         if (EXTCON_TYPE_USB & type)
 355                 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
 356         if (EXTCON_TYPE_CHG & type)
 357                 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
 358         if (EXTCON_TYPE_JACK & type)
 359                 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
 360         if (EXTCON_TYPE_DISP & type)
 361                 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
 362 }
 363
 364 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 365                           char *buf)
 366 {
 367         int i, count = 0;
 368         struct extcon_dev *edev = dev_get_drvdata(dev);
 369
 370         if (edev->max_supported == 0)
 371                 return sprintf(buf, "%u\n", edev->state);
 372
 373         for (i = 0; i < edev->max_supported; i++) {
 374                 count += sprintf(buf + count, "%s=%d\n",
 375                                 extcon_info[edev->supported_cable[i]].name,
 376                                  !!(edev->state & BIT(i)));
 377         }
 378
 379         return count;
 380 }
 381 static DEVICE_ATTR_RO(state);
 382
 383 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 384                 char *buf)
 385 {
 386         struct extcon_dev *edev = dev_get_drvdata(dev);
 387
 388         return sprintf(buf, "%s\n", edev->name);
 389 }
 390 static DEVICE_ATTR_RO(name);
 391
 392 static ssize_t cable_name_show(struct device *dev,
 393                                struct device_attribute *attr, char *buf)
 394 {
 395         struct extcon_cable *cable = container_of(attr, struct extcon_cable,
 396                                                   attr_name);
 397         int i = cable->cable_index;
 398
 399         return sprintf(buf, "%s\n",
 400                         extcon_info[cable->edev->supported_cable[i]].name);
 401 }
 402
 403 static ssize_t cable_state_show(struct device *dev,
 404                                 struct device_attribute *attr, char *buf)
 405 {
 406         struct extcon_cable *cable = container_of(attr, struct extcon_cable,
 407                                                   attr_state);
 408
 409         int i = cable->cable_index;
 410
 411         return sprintf(buf, "%d\n",
 412                 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
 413 }
 414
 415 /**
 416  * extcon_sync() - Synchronize the state for an external connector.
 417  * @edev:       the extcon device
 418  *
 419  * Note that this function send a notification in order to synchronize
 420  * the state and property of an external connector.
 421  *
 422  * Returns 0 if success or error number if fail.
 423  */
 424 int extcon_sync(struct extcon_dev *edev, unsigned int id)
 425 {
 426         char name_buf[120];
 427         char state_buf[120];
 428         char *prop_buf;
 429         char *envp[3];
 430         int env_offset = 0;
 431         int length;
 432         int index;
 433         int state;
 434         unsigned long flags;
 435
 436         if (!edev)
 437                 return -EINVAL;
 438
 439         index = find_cable_index_by_id(edev, id);
 440         if (index < 0)
 441                 return index;
 442
 443         spin_lock_irqsave(&edev->lock, flags);
 444         state = !!(edev->state & BIT(index));
 445         spin_unlock_irqrestore(&edev->lock, flags);
 446
 447         /*
 448          * Call functions in a raw notifier chain for the specific one
 449          * external connector.
 450          */
 451         raw_notifier_call_chain(&edev->nh[index], state, edev);
 452
 453         /*
 454          * Call functions in a raw notifier chain for the all supported
 455          * external connectors.
 456          */
 457         raw_notifier_call_chain(&edev->nh_all, state, edev);
 458
 459         spin_lock_irqsave(&edev->lock, flags);
 460         /* This could be in interrupt handler */
 461         prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
 462         if (!prop_buf) {
 463                 /* Unlock early before uevent */
 464                 spin_unlock_irqrestore(&edev->lock, flags);
 465
 466                 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
 467                 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
 468
 469                 return -ENOMEM;
 470         }
 471
 472         length = name_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(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
 477                 envp[env_offset++] = name_buf;
 478         }
 479
 480         length = state_show(&edev->dev, NULL, prop_buf);
 481         if (length > 0) {
 482                 if (prop_buf[length - 1] == '\n')
 483                         prop_buf[length - 1] = 0;
 484                 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
 485                 envp[env_offset++] = state_buf;
 486         }
 487         envp[env_offset] = NULL;
 488
 489         /* Unlock early before uevent */
 490         spin_unlock_irqrestore(&edev->lock, flags);
 491         kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
 492         free_page((unsigned long)prop_buf);
 493
 494         return 0;
 495 }
 496 EXPORT_SYMBOL_GPL(extcon_sync);
 497
 498 /**
 499  * extcon_get_state() - Get the state of an external connector.
 500  * @edev:       the extcon device
 501  * @id:         the unique id indicating an external connector
 502  *
 503  * Returns 0 if success or error number if fail.
 504  */
 505 int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
 506 {
 507         int index, state;
 508         unsigned long flags;
 509
 510         if (!edev)
 511                 return -EINVAL;
 512
 513         index = find_cable_index_by_id(edev, id);
 514         if (index < 0)
 515                 return index;
 516
 517         spin_lock_irqsave(&edev->lock, flags);
 518         state = is_extcon_attached(edev, index);
 519         spin_unlock_irqrestore(&edev->lock, flags);
 520
 521         return state;
 522 }
 523 EXPORT_SYMBOL_GPL(extcon_get_state);
 524
 525 /**
 526  * extcon_set_state() - Set the state of an external connector.
 527  * @edev:       the extcon device
 528  * @id:         the unique id indicating an external connector
 529  * @state:      the new state of an external connector.
 530  *              the default semantics is true: attached / false: detached.
 531  *
 532  * Note that this function set the state of an external connector without
 533  * a notification. To synchronize the state of an external connector,
 534  * have to use extcon_set_state_sync() and extcon_sync().
 535  *
 536  * Returns 0 if success or error number if fail.
 537  */
 538 int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool 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, state))
 554                 goto out;
 555
 556         if (check_mutually_exclusive(edev,
 557                 (edev->state & ~BIT(index)) | (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 (!state)
 567                 init_property(edev, id, index);
 568
 569         /* Update the state for an external connector. */
 570         if (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 an external connector with sync.
 583  * @edev:       the extcon device
 584  * @id:         the unique id indicating an external connector
 585  * @state:      the new state of external connector.
 586  *              the default semantics is true: attached / false: detached.
 587  *
 588  * Note that this function set the state of external connector
 589  * and synchronize the state by sending a notification.
 590  *
 591  * Returns 0 if success or error number if fail.
 592  */
 593 int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
 594 {
 595         int ret, index;
 596         unsigned long flags;
 597
 598         index = find_cable_index_by_id(edev, id);
 599         if (index < 0)
 600                 return index;
 601
 602         /* Check whether the external connector's state is changed. */
 603         spin_lock_irqsave(&edev->lock, flags);
 604         ret = is_extcon_changed(edev, index, state);
 605         spin_unlock_irqrestore(&edev->lock, flags);
 606         if (!ret)
 607                 return 0;
 608
 609         ret = extcon_set_state(edev, id, state);
 610         if (ret < 0)
 611                 return ret;
 612
 613         return extcon_sync(edev, id);
 614 }
 615 EXPORT_SYMBOL_GPL(extcon_set_state_sync);
 616
 617 /**
 618  * extcon_get_property() - Get the property value of an external connector.
 619  * @edev:       the extcon device
 620  * @id:         the unique id indicating an external connector
 621  * @prop:       the property id indicating an extcon property
 622  * @prop_val:   the pointer which store the value of extcon property
 623  *
 624  * Note that when getting the property value of external connector,
 625  * the external connector should be attached. If detached state, function
 626  * return 0 without property value. Also, the each property should be
 627  * included in the list of supported properties according to extcon type.
 628  *
 629  * Returns 0 if success or error number if fail.
 630  */
 631 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
 632                                 unsigned int prop,
 633                                 union extcon_property_value *prop_val)
 634 {
 635         struct extcon_cable *cable;
 636         unsigned long flags;
 637         int index, ret = 0;
 638
 639         *prop_val = (union extcon_property_value)(0);
 640
 641         if (!edev)
 642                 return -EINVAL;
 643
 644         /* Check whether the property is supported or not */
 645         if (!is_extcon_property_supported(id, prop))
 646                 return -EINVAL;
 647
 648         /* Find the cable index of external connector by using id */
 649         index = find_cable_index_by_id(edev, id);
 650         if (index < 0)
 651                 return index;
 652
 653         spin_lock_irqsave(&edev->lock, flags);
 654
 655         /* Check whether the property is available or not. */
 656         if (!is_extcon_property_capability(edev, id, index, prop)) {
 657                 spin_unlock_irqrestore(&edev->lock, flags);
 658                 return -EPERM;
 659         }
 660
 661         /*
 662          * Check whether the external connector is attached.
 663          * If external connector is detached, the user can not
 664          * get the property value.
 665          */
 666         if (!is_extcon_attached(edev, index)) {
 667                 spin_unlock_irqrestore(&edev->lock, flags);
 668                 return 0;
 669         }
 670
 671         cable = &edev->cables[index];
 672
 673         /* Get the property value according to extcon type */
 674         switch (prop) {
 675         case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
 676                 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
 677                 break;
 678         case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
 679                 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
 680                 break;
 681         case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
 682                 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
 683                 break;
 684         case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
 685                 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
 686                 break;
 687         default:
 688                 ret = -EINVAL;
 689                 break;
 690         }
 691
 692         spin_unlock_irqrestore(&edev->lock, flags);
 693
 694         return ret;
 695 }
 696 EXPORT_SYMBOL_GPL(extcon_get_property);
 697
 698 /**
 699  * extcon_set_property() - Set the property value of an external connector.
 700  * @edev:       the extcon device
 701  * @id:         the unique id indicating an external connector
 702  * @prop:       the property id indicating an extcon property
 703  * @prop_val:   the pointer including the new value of extcon property
 704  *
 705  * Note that each property should be included in the list of supported
 706  * properties according to the extcon type.
 707  *
 708  * Returns 0 if success or error number if fail.
 709  */
 710 int extcon_set_property(struct extcon_dev *edev, unsigned int id,
 711                                 unsigned int prop,
 712                                 union extcon_property_value prop_val)
 713 {
 714         struct extcon_cable *cable;
 715         unsigned long flags;
 716         int index, ret = 0;
 717
 718         if (!edev)
 719                 return -EINVAL;
 720
 721         /* Check whether the property is supported or not */
 722         if (!is_extcon_property_supported(id, prop))
 723                 return -EINVAL;
 724
 725         /* Find the cable index of external connector by using id */
 726         index = find_cable_index_by_id(edev, id);
 727         if (index < 0)
 728                 return index;
 729
 730         spin_lock_irqsave(&edev->lock, flags);
 731
 732         /* Check whether the property is available or not. */
 733         if (!is_extcon_property_capability(edev, id, index, prop)) {
 734                 spin_unlock_irqrestore(&edev->lock, flags);
 735                 return -EPERM;
 736         }
 737
 738         cable = &edev->cables[index];
 739
 740         /* Set the property value according to extcon type */
 741         switch (prop) {
 742         case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
 743                 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
 744                 break;
 745         case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
 746                 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
 747                 break;
 748         case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
 749                 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
 750                 break;
 751         case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
 752                 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
 753                 break;
 754         default:
 755                 ret = -EINVAL;
 756                 break;
 757         }
 758
 759         spin_unlock_irqrestore(&edev->lock, flags);
 760
 761         return ret;
 762 }
 763 EXPORT_SYMBOL_GPL(extcon_set_property);
 764
 765 /**
 766  * extcon_set_property_sync() - Set property of an external connector with sync.
 767  * @prop_val:   the pointer including the new value of extcon property
 768  *
 769  * Note that when setting the property value of external connector,
 770  * the external connector should be attached. The each property should
 771  * be included in the list of supported properties according to extcon type.
 772  *
 773  * Returns 0 if success or error number if fail.
 774  */
 775 int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
 776                                 unsigned int prop,
 777                                 union extcon_property_value prop_val)
 778 {
 779         int ret;
 780
 781         ret = extcon_set_property(edev, id, prop, prop_val);
 782         if (ret < 0)
 783                 return ret;
 784
 785         return extcon_sync(edev, id);
 786 }
 787 EXPORT_SYMBOL_GPL(extcon_set_property_sync);
 788
 789 /**
 790  * extcon_get_property_capability() - Get the capability of the property
 791  *                                      for an external connector.
 792  * @edev:       the extcon device
 793  * @id:         the unique id indicating an external connector
 794  * @prop:       the property id indicating an extcon property
 795  *
 796  * Returns 1 if the property is available or 0 if not available.
 797  */
 798 int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
 799                                         unsigned int prop)
 800 {
 801         int index;
 802
 803         if (!edev)
 804                 return -EINVAL;
 805
 806         /* Check whether the property is supported or not */
 807         if (!is_extcon_property_supported(id, prop))
 808                 return -EINVAL;
 809
 810         /* Find the cable index of external connector by using id */
 811         index = find_cable_index_by_id(edev, id);
 812         if (index < 0)
 813                 return index;
 814
 815         return is_extcon_property_capability(edev, id, index, prop);
 816 }
 817 EXPORT_SYMBOL_GPL(extcon_get_property_capability);
 818
 819 /**
 820  * extcon_set_property_capability() - Set the capability of the property
 821  *                                      for an external connector.
 822  * @edev:       the extcon device
 823  * @id:         the unique id indicating an external connector
 824  * @prop:       the property id indicating an extcon property
 825  *
 826  * Note that this function set the capability of the property
 827  * for an external connector in order to mark the bit in capability
 828  * bitmap which mean the available state of the property.
 829  *
 830  * Returns 0 if success or error number if fail.
 831  */
 832 int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
 833                                         unsigned int prop)
 834 {
 835         struct extcon_cable *cable;
 836         int index, type, ret = 0;
 837
 838         if (!edev)
 839                 return -EINVAL;
 840
 841         /* Check whether the property is supported or not. */
 842         if (!is_extcon_property_supported(id, prop))
 843                 return -EINVAL;
 844
 845         /* Find the cable index of external connector by using id. */
 846         index = find_cable_index_by_id(edev, id);
 847         if (index < 0)
 848                 return index;
 849
 850         type = get_extcon_type(prop);
 851         if (type < 0)
 852                 return type;
 853
 854         cable = &edev->cables[index];
 855
 856         switch (type) {
 857         case EXTCON_TYPE_USB:
 858                 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
 859                 break;
 860         case EXTCON_TYPE_CHG:
 861                 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
 862                 break;
 863         case EXTCON_TYPE_JACK:
 864                 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
 865                 break;
 866         case EXTCON_TYPE_DISP:
 867                 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
 868                 break;
 869         default:
 870                 ret = -EINVAL;
 871         }
 872
 873         return ret;
 874 }
 875 EXPORT_SYMBOL_GPL(extcon_set_property_capability);
 876
 877 /**
 878  * extcon_get_extcon_dev() - Get the extcon device instance from the name.
 879  * @extcon_name:        the extcon name provided with extcon_dev_register()
 880  *
 881  * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
 882  */
 883 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
 884 {
 885         struct extcon_dev *sd;
 886
 887         if (!extcon_name)
 888                 return ERR_PTR(-EINVAL);
 889
 890         mutex_lock(&extcon_dev_list_lock);
 891         list_for_each_entry(sd, &extcon_dev_list, entry) {
 892                 if (!strcmp(sd->name, extcon_name))
 893                         goto out;
 894         }
 895         sd = NULL;
 896 out:
 897         mutex_unlock(&extcon_dev_list_lock);
 898         return sd;
 899 }
 900 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
 901
 902 /**
 903  * extcon_register_notifier() - Register a notifier block to get notified by
 904  *                              any state changes from the extcon.
 905  * @edev:       the extcon device
 906  * @id:         the unique id indicating an external connector
 907  * @nb:         a notifier block to be registered
 908  *
 909  * Note that the second parameter given to the callback of nb (val) is
 910  * the current state of an external connector and the third pameter
 911  * is the pointer of extcon device.
 912  *
 913  * Returns 0 if success or error number if fail.
 914  */
 915 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
 916                              struct notifier_block *nb)
 917 {
 918         unsigned long flags;
 919         int ret, idx = -EINVAL;
 920
 921         if (!edev || !nb)
 922                 return -EINVAL;
 923
 924         idx = find_cable_index_by_id(edev, id);
 925         if (idx < 0)
 926                 return idx;
 927
 928         spin_lock_irqsave(&edev->lock, flags);
 929         ret = raw_notifier_chain_register(&edev->nh[idx], nb);
 930         spin_unlock_irqrestore(&edev->lock, flags);
 931
 932         return ret;
 933 }
 934 EXPORT_SYMBOL_GPL(extcon_register_notifier);
 935
 936 /**
 937  * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
 938  * @edev:       the extcon device
 939  * @id:         the unique id indicating an external connector
 940  * @nb:         a notifier block to be registered
 941  *
 942  * Returns 0 if success or error number if fail.
 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
 968  * @nb:         a notifier block to be registered
 969  *
 970  * Note that this function registers a notifier block in order to receive
 971  * the state 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 the third pameter is the pointer of extcon device.
 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
 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:    the array of the supported external connectors
1049  *                      ending with EXTCON_NONE.
1050  *
1051  * Note that this function allocates the memory for extcon device
1052  * and initialize default setting for the extcon device.
1053  *
1054  * Returns the pointer memory of allocated extcon_dev if success
1055  * or ERR_PTR(err) if fail.
1056  */
1057 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1058 {
1059         struct extcon_dev *edev;
1060
1061         if (!supported_cable)
1062                 return ERR_PTR(-EINVAL);
1063
1064         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1065         if (!edev)
1066                 return ERR_PTR(-ENOMEM);
1067
1068         edev->max_supported = 0;
1069         edev->supported_cable = supported_cable;
1070
1071         return edev;
1072 }
1073
1074 /*
1075  * extcon_dev_free() - Free the memory of extcon device.
1076  * @edev:       the extcon device
1077  */
1078 void extcon_dev_free(struct extcon_dev *edev)
1079 {
1080         kfree(edev);
1081 }
1082 EXPORT_SYMBOL_GPL(extcon_dev_free);
1083
1084 /**
1085  * extcon_dev_register() - Register an new extcon device
1086  * @edev:       the extcon device to be registered
1087  *
1088  * Among the members of edev struct, please set the "user initializing data"
1089  * do not set the values of "internal data", which are initialized by
1090  * this function.
1091  *
1092  * Note that before calling this funciton, have to allocate the memory
1093  * of an extcon device by using the extcon_dev_allocate(). And the extcon
1094  * dev should include the supported_cable information.
1095  *
1096  * Returns 0 if success or error number if fail.
1097  */
1098 int extcon_dev_register(struct extcon_dev *edev)
1099 {
1100         int ret, index = 0;
1101         static atomic_t edev_no = ATOMIC_INIT(-1);
1102
1103         if (!extcon_class) {
1104                 ret = create_extcon_class();
1105                 if (ret < 0)
1106                         return ret;
1107         }
1108
1109         if (!edev || !edev->supported_cable)
1110                 return -EINVAL;
1111
1112         for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1113
1114         edev->max_supported = index;
1115         if (index > SUPPORTED_CABLE_MAX) {
1116                 dev_err(&edev->dev,
1117                         "exceed the maximum number of supported cables\n");
1118                 return -EINVAL;
1119         }
1120
1121         edev->dev.class = extcon_class;
1122         edev->dev.release = extcon_dev_release;
1123
1124         edev->name = dev_name(edev->dev.parent);
1125         if (IS_ERR_OR_NULL(edev->name)) {
1126                 dev_err(&edev->dev,
1127                         "extcon device name is null\n");
1128                 return -EINVAL;
1129         }
1130         dev_set_name(&edev->dev, "extcon%lu",
1131                         (unsigned long)atomic_inc_return(&edev_no));
1132
1133         if (edev->max_supported) {
1134                 char buf[10];
1135                 char *str;
1136                 struct extcon_cable *cable;
1137
1138                 edev->cables = kzalloc(sizeof(struct extcon_cable) *
1139                                        edev->max_supported, GFP_KERNEL);
1140                 if (!edev->cables) {
1141                         ret = -ENOMEM;
1142                         goto err_sysfs_alloc;
1143                 }
1144                 for (index = 0; index < edev->max_supported; index++) {
1145                         cable = &edev->cables[index];
1146
1147                         snprintf(buf, 10, "cable.%d", index);
1148                         str = kzalloc(sizeof(char) * (strlen(buf) + 1),
1149                                       GFP_KERNEL);
1150                         if (!str) {
1151                                 for (index--; index >= 0; index--) {
1152                                         cable = &edev->cables[index];
1153                                         kfree(cable->attr_g.name);
1154                                 }
1155                                 ret = -ENOMEM;
1156
1157                                 goto err_alloc_cables;
1158                         }
1159                         strcpy(str, buf);
1160
1161                         cable->edev = edev;
1162                         cable->cable_index = index;
1163                         cable->attrs[0] = &cable->attr_name.attr;
1164                         cable->attrs[1] = &cable->attr_state.attr;
1165                         cable->attrs[2] = NULL;
1166                         cable->attr_g.name = str;
1167                         cable->attr_g.attrs = cable->attrs;
1168
1169                         sysfs_attr_init(&cable->attr_name.attr);
1170                         cable->attr_name.attr.name = "name";
1171                         cable->attr_name.attr.mode = 0444;
1172                         cable->attr_name.show = cable_name_show;
1173
1174                         sysfs_attr_init(&cable->attr_state.attr);
1175                         cable->attr_state.attr.name = "state";
1176                         cable->attr_state.attr.mode = 0444;
1177                         cable->attr_state.show = cable_state_show;
1178                 }
1179         }
1180
1181         if (edev->max_supported && edev->mutually_exclusive) {
1182                 char buf[80];
1183                 char *name;
1184
1185                 /* Count the size of mutually_exclusive array */
1186                 for (index = 0; edev->mutually_exclusive[index]; index++)
1187                         ;
1188
1189                 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
1190                                            (index + 1), GFP_KERNEL);
1191                 if (!edev->attrs_muex) {
1192                         ret = -ENOMEM;
1193                         goto err_muex;
1194                 }
1195
1196                 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
1197                                              index, GFP_KERNEL);
1198                 if (!edev->d_attrs_muex) {
1199                         ret = -ENOMEM;
1200                         kfree(edev->attrs_muex);
1201                         goto err_muex;
1202                 }
1203
1204                 for (index = 0; edev->mutually_exclusive[index]; index++) {
1205                         sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
1206                         name = kzalloc(sizeof(char) * (strlen(buf) + 1),
1207                                        GFP_KERNEL);
1208                         if (!name) {
1209                                 for (index--; index >= 0; index--) {
1210                                         kfree(edev->d_attrs_muex[index].attr.
1211                                               name);
1212                                 }
1213                                 kfree(edev->d_attrs_muex);
1214                                 kfree(edev->attrs_muex);
1215                                 ret = -ENOMEM;
1216                                 goto err_muex;
1217                         }
1218                         strcpy(name, buf);
1219                         sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1220                         edev->d_attrs_muex[index].attr.name = name;
1221                         edev->d_attrs_muex[index].attr.mode = 0000;
1222                         edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1223                                                         .attr;
1224                 }
1225                 edev->attr_g_muex.name = muex_name;
1226                 edev->attr_g_muex.attrs = edev->attrs_muex;
1227
1228         }
1229
1230         if (edev->max_supported) {
1231                 edev->extcon_dev_type.groups =
1232                         kzalloc(sizeof(struct attribute_group *) *
1233                                 (edev->max_supported + 2), GFP_KERNEL);
1234                 if (!edev->extcon_dev_type.groups) {
1235                         ret = -ENOMEM;
1236                         goto err_alloc_groups;
1237                 }
1238
1239                 edev->extcon_dev_type.name = dev_name(&edev->dev);
1240                 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1241
1242                 for (index = 0; index < edev->max_supported; index++)
1243                         edev->extcon_dev_type.groups[index] =
1244                                 &edev->cables[index].attr_g;
1245                 if (edev->mutually_exclusive)
1246                         edev->extcon_dev_type.groups[index] =
1247                                 &edev->attr_g_muex;
1248
1249                 edev->dev.type = &edev->extcon_dev_type;
1250         }
1251
1252         spin_lock_init(&edev->lock);
1253         if (edev->max_supported) {
1254                 edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh),
1255                                 GFP_KERNEL);
1256                 if (!edev->nh) {
1257                         ret = -ENOMEM;
1258                         goto err_alloc_nh;
1259                 }
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         ret = device_register(&edev->dev);
1271         if (ret) {
1272                 put_device(&edev->dev);
1273                 goto err_dev;
1274         }
1275
1276         mutex_lock(&extcon_dev_list_lock);
1277         list_add(&edev->entry, &extcon_dev_list);
1278         mutex_unlock(&extcon_dev_list_lock);
1279
1280         return 0;
1281
1282 err_dev:
1283         if (edev->max_supported)
1284                 kfree(edev->nh);
1285 err_alloc_nh:
1286         if (edev->max_supported)
1287                 kfree(edev->extcon_dev_type.groups);
1288 err_alloc_groups:
1289         if (edev->max_supported && edev->mutually_exclusive) {
1290                 for (index = 0; edev->mutually_exclusive[index]; index++)
1291                         kfree(edev->d_attrs_muex[index].attr.name);
1292                 kfree(edev->d_attrs_muex);
1293                 kfree(edev->attrs_muex);
1294         }
1295 err_muex:
1296         for (index = 0; index < edev->max_supported; index++)
1297                 kfree(edev->cables[index].attr_g.name);
1298 err_alloc_cables:
1299         if (edev->max_supported)
1300                 kfree(edev->cables);
1301 err_sysfs_alloc:
1302         return ret;
1303 }
1304 EXPORT_SYMBOL_GPL(extcon_dev_register);
1305
1306 /**
1307  * extcon_dev_unregister() - Unregister the extcon device.
1308  * @edev:       the extcon device to be unregistered.
1309  *
1310  * Note that this does not call kfree(edev) because edev was not allocated
1311  * by this class.
1312  */
1313 void extcon_dev_unregister(struct extcon_dev *edev)
1314 {
1315         int index;
1316
1317         if (!edev)
1318                 return;
1319
1320         mutex_lock(&extcon_dev_list_lock);
1321         list_del(&edev->entry);
1322         mutex_unlock(&extcon_dev_list_lock);
1323
1324         if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1325                 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1326                                 dev_name(&edev->dev));
1327                 return;
1328         }
1329
1330         device_unregister(&edev->dev);
1331
1332         if (edev->mutually_exclusive && edev->max_supported) {
1333                 for (index = 0; edev->mutually_exclusive[index];
1334                                 index++)
1335                         kfree(edev->d_attrs_muex[index].attr.name);
1336                 kfree(edev->d_attrs_muex);
1337                 kfree(edev->attrs_muex);
1338         }
1339
1340         for (index = 0; index < edev->max_supported; index++)
1341                 kfree(edev->cables[index].attr_g.name);
1342
1343         if (edev->max_supported) {
1344                 kfree(edev->extcon_dev_type.groups);
1345                 kfree(edev->cables);
1346                 kfree(edev->nh);
1347         }
1348
1349         put_device(&edev->dev);
1350 }
1351 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1352
1353 #ifdef CONFIG_OF
1354 /*
1355  * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1356  * @dev         : the instance to the given device
1357  * @index       : the index into list of extcon_dev
1358  *
1359  * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1360  */
1361 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1362 {
1363         struct device_node *node;
1364         struct extcon_dev *edev;
1365
1366         if (!dev)
1367                 return ERR_PTR(-EINVAL);
1368
1369         if (!dev->of_node) {
1370                 dev_dbg(dev, "device does not have a device node entry\n");
1371                 return ERR_PTR(-EINVAL);
1372         }
1373
1374         node = of_parse_phandle(dev->of_node, "extcon", index);
1375         if (!node) {
1376                 dev_dbg(dev, "failed to get phandle in %pOF node\n",
1377                         dev->of_node);
1378                 return ERR_PTR(-ENODEV);
1379         }
1380
1381         mutex_lock(&extcon_dev_list_lock);
1382         list_for_each_entry(edev, &extcon_dev_list, entry) {
1383                 if (edev->dev.parent && edev->dev.parent->of_node == node) {
1384                         mutex_unlock(&extcon_dev_list_lock);
1385                         of_node_put(node);
1386                         return edev;
1387                 }
1388         }
1389         mutex_unlock(&extcon_dev_list_lock);
1390         of_node_put(node);
1391
1392         return ERR_PTR(-EPROBE_DEFER);
1393 }
1394 #else
1395 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1396 {
1397         return ERR_PTR(-ENOSYS);
1398 }
1399 #endif /* CONFIG_OF */
1400 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1401
1402 /**
1403  * extcon_get_edev_name() - Get the name of the extcon device.
1404  * @edev:       the extcon device
1405  */
1406 const char *extcon_get_edev_name(struct extcon_dev *edev)
1407 {
1408         return !edev ? NULL : edev->name;
1409 }
1410
1411 static int __init extcon_class_init(void)
1412 {
1413         return create_extcon_class();
1414 }
1415 module_init(extcon_class_init);
1416
1417 static void __exit extcon_class_exit(void)
1418 {
1419         class_destroy(extcon_class);
1420 }
1421 module_exit(extcon_class_exit);
1422
1423 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1424 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1425 MODULE_DESCRIPTION("External Connector (extcon) framework");
1426 MODULE_LICENSE("GPL v2");