drivers/extcon/extcon.c

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