| 1 | /* |
| 2 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
| 3 | * |
| 4 | * External connector (extcon) class driver |
| 5 | * |
| 6 | * Copyright (C) 2015 Samsung Electronics |
| 7 | * Author: Chanwoo Choi <cw00.choi@samsung.com> |
| 8 | * |
| 9 | * Copyright (C) 2012 Samsung Electronics |
| 10 | * Author: Donggeun Kim <dg77.kim@samsung.com> |
| 11 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> |
| 12 | * |
| 13 | * based on android/drivers/switch/switch_class.c |
| 14 | * Copyright (C) 2008 Google, Inc. |
| 15 | * Author: Mike Lockwood <lockwood@android.com> |
| 16 | * |
| 17 | * This software is licensed under the terms of the GNU General Public |
| 18 | * License version 2, as published by the Free Software Foundation, and |
| 19 | * may be copied, distributed, and modified under those terms. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | * GNU General Public License for more details. |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/types.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/device.h> |
| 31 | #include <linux/fs.h> |
| 32 | #include <linux/err.h> |
| 33 | #include <linux/extcon.h> |
| 34 | #include <linux/of.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/sysfs.h> |
| 37 | |
| 38 | #define SUPPORTED_CABLE_MAX 32 |
| 39 | #define CABLE_NAME_MAX 30 |
| 40 | |
| 41 | static const char *extcon_name[] = { |
| 42 | [EXTCON_NONE] = "NONE", |
| 43 | |
| 44 | /* USB external connector */ |
| 45 | [EXTCON_USB] = "USB", |
| 46 | [EXTCON_USB_HOST] = "USB-HOST", |
| 47 | |
| 48 | /* Charging external connector */ |
| 49 | [EXTCON_CHG_USB_SDP] = "SDP", |
| 50 | [EXTCON_CHG_USB_DCP] = "DCP", |
| 51 | [EXTCON_CHG_USB_CDP] = "CDP", |
| 52 | [EXTCON_CHG_USB_ACA] = "ACA", |
| 53 | [EXTCON_CHG_USB_FAST] = "FAST-CHARGER", |
| 54 | [EXTCON_CHG_USB_SLOW] = "SLOW-CHARGER", |
| 55 | |
| 56 | /* Jack external connector */ |
| 57 | [EXTCON_JACK_MICROPHONE] = "MICROPHONE", |
| 58 | [EXTCON_JACK_HEADPHONE] = "HEADPHONE", |
| 59 | [EXTCON_JACK_LINE_IN] = "LINE-IN", |
| 60 | [EXTCON_JACK_LINE_OUT] = "LINE-OUT", |
| 61 | [EXTCON_JACK_VIDEO_IN] = "VIDEO-IN", |
| 62 | [EXTCON_JACK_VIDEO_OUT] = "VIDEO-OUT", |
| 63 | [EXTCON_JACK_SPDIF_IN] = "SPDIF-IN", |
| 64 | [EXTCON_JACK_SPDIF_OUT] = "SPDIF-OUT", |
| 65 | |
| 66 | /* Display external connector */ |
| 67 | [EXTCON_DISP_HDMI] = "HDMI", |
| 68 | [EXTCON_DISP_MHL] = "MHL", |
| 69 | [EXTCON_DISP_DVI] = "DVI", |
| 70 | [EXTCON_DISP_VGA] = "VGA", |
| 71 | |
| 72 | /* Miscellaneous external connector */ |
| 73 | [EXTCON_DOCK] = "DOCK", |
| 74 | [EXTCON_JIG] = "JIG", |
| 75 | [EXTCON_MECHANICAL] = "MECHANICAL", |
| 76 | |
| 77 | NULL, |
| 78 | }; |
| 79 | |
| 80 | static struct class *extcon_class; |
| 81 | #if defined(CONFIG_ANDROID) |
| 82 | static struct class_compat *switch_class; |
| 83 | #endif /* CONFIG_ANDROID */ |
| 84 | |
| 85 | static LIST_HEAD(extcon_dev_list); |
| 86 | static DEFINE_MUTEX(extcon_dev_list_lock); |
| 87 | |
| 88 | /** |
| 89 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive |
| 90 | * condition. |
| 91 | * @edev: the extcon device |
| 92 | * @new_state: new cable attach status for @edev |
| 93 | * |
| 94 | * Returns 0 if nothing violates. Returns the index + 1 for the first |
| 95 | * violated condition. |
| 96 | */ |
| 97 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) |
| 98 | { |
| 99 | int i = 0; |
| 100 | |
| 101 | if (!edev->mutually_exclusive) |
| 102 | return 0; |
| 103 | |
| 104 | for (i = 0; edev->mutually_exclusive[i]; i++) { |
| 105 | int weight; |
| 106 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
| 107 | |
| 108 | /* calculate the total number of bits set */ |
| 109 | weight = hweight32(correspondants); |
| 110 | if (weight > 1) |
| 111 | return i + 1; |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
| 118 | { |
| 119 | int i; |
| 120 | |
| 121 | /* Find the the index of extcon cable in edev->supported_cable */ |
| 122 | for (i = 0; i < edev->max_supported; i++) { |
| 123 | if (edev->supported_cable[i] == id) |
| 124 | return i; |
| 125 | } |
| 126 | |
| 127 | return -EINVAL; |
| 128 | } |
| 129 | |
| 130 | static int find_cable_id_by_name(struct extcon_dev *edev, const char *name) |
| 131 | { |
| 132 | int id = -EINVAL; |
| 133 | int i = 0; |
| 134 | |
| 135 | /* Find the id of extcon cable */ |
| 136 | while (extcon_name[i]) { |
| 137 | if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { |
| 138 | id = i; |
| 139 | break; |
| 140 | } |
| 141 | i++; |
| 142 | } |
| 143 | |
| 144 | return id; |
| 145 | } |
| 146 | |
| 147 | static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) |
| 148 | { |
| 149 | int id; |
| 150 | |
| 151 | if (edev->max_supported == 0) |
| 152 | return -EINVAL; |
| 153 | |
| 154 | /* Find the the number of extcon cable */ |
| 155 | id = find_cable_id_by_name(edev, name); |
| 156 | if (id < 0) |
| 157 | return id; |
| 158 | |
| 159 | return find_cable_index_by_id(edev, id); |
| 160 | } |
| 161 | |
| 162 | static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached) |
| 163 | { |
| 164 | if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) { |
| 165 | *attached = ((new >> idx) & 0x1) ? true : false; |
| 166 | return true; |
| 167 | } |
| 168 | |
| 169 | return false; |
| 170 | } |
| 171 | |
| 172 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
| 173 | char *buf) |
| 174 | { |
| 175 | int i, count = 0; |
| 176 | struct extcon_dev *edev = dev_get_drvdata(dev); |
| 177 | |
| 178 | if (edev->max_supported == 0) |
| 179 | return sprintf(buf, "%u\n", edev->state); |
| 180 | |
| 181 | for (i = 0; i < edev->max_supported; i++) { |
| 182 | count += sprintf(buf + count, "%s=%d\n", |
| 183 | extcon_name[edev->supported_cable[i]], |
| 184 | !!(edev->state & (1 << i))); |
| 185 | } |
| 186 | |
| 187 | return count; |
| 188 | } |
| 189 | |
| 190 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
| 191 | const char *buf, size_t count) |
| 192 | { |
| 193 | u32 state; |
| 194 | ssize_t ret = 0; |
| 195 | struct extcon_dev *edev = dev_get_drvdata(dev); |
| 196 | |
| 197 | ret = sscanf(buf, "0x%x", &state); |
| 198 | if (ret == 0) |
| 199 | ret = -EINVAL; |
| 200 | else |
| 201 | ret = extcon_set_state(edev, state); |
| 202 | |
| 203 | if (ret < 0) |
| 204 | return ret; |
| 205 | |
| 206 | return count; |
| 207 | } |
| 208 | static DEVICE_ATTR_RW(state); |
| 209 | |
| 210 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
| 211 | char *buf) |
| 212 | { |
| 213 | struct extcon_dev *edev = dev_get_drvdata(dev); |
| 214 | |
| 215 | return sprintf(buf, "%s\n", edev->name); |
| 216 | } |
| 217 | static DEVICE_ATTR_RO(name); |
| 218 | |
| 219 | static ssize_t cable_name_show(struct device *dev, |
| 220 | struct device_attribute *attr, char *buf) |
| 221 | { |
| 222 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, |
| 223 | attr_name); |
| 224 | int i = cable->cable_index; |
| 225 | |
| 226 | return sprintf(buf, "%s\n", |
| 227 | extcon_name[cable->edev->supported_cable[i]]); |
| 228 | } |
| 229 | |
| 230 | static ssize_t cable_state_show(struct device *dev, |
| 231 | struct device_attribute *attr, char *buf) |
| 232 | { |
| 233 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, |
| 234 | attr_state); |
| 235 | |
| 236 | int i = cable->cable_index; |
| 237 | |
| 238 | return sprintf(buf, "%d\n", |
| 239 | extcon_get_cable_state_(cable->edev, |
| 240 | cable->edev->supported_cable[i])); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * extcon_update_state() - Update the cable attach states of the extcon device |
| 245 | * only for the masked bits. |
| 246 | * @edev: the extcon device |
| 247 | * @mask: the bit mask to designate updated bits. |
| 248 | * @state: new cable attach status for @edev |
| 249 | * |
| 250 | * Changing the state sends uevent with environment variable containing |
| 251 | * the name of extcon device (envp[0]) and the state output (envp[1]). |
| 252 | * Tizen uses this format for extcon device to get events from ports. |
| 253 | * Android uses this format as well. |
| 254 | * |
| 255 | * Note that the notifier provides which bits are changed in the state |
| 256 | * variable with the val parameter (second) to the callback. |
| 257 | */ |
| 258 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
| 259 | { |
| 260 | char name_buf[120]; |
| 261 | char state_buf[120]; |
| 262 | char *prop_buf; |
| 263 | char *envp[3]; |
| 264 | int env_offset = 0; |
| 265 | int length; |
| 266 | int index; |
| 267 | unsigned long flags; |
| 268 | bool attached; |
| 269 | |
| 270 | if (!edev) |
| 271 | return -EINVAL; |
| 272 | |
| 273 | spin_lock_irqsave(&edev->lock, flags); |
| 274 | |
| 275 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
| 276 | u32 old_state; |
| 277 | |
| 278 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
| 279 | (state & mask))) { |
| 280 | spin_unlock_irqrestore(&edev->lock, flags); |
| 281 | return -EPERM; |
| 282 | } |
| 283 | |
| 284 | old_state = edev->state; |
| 285 | edev->state &= ~mask; |
| 286 | edev->state |= state & mask; |
| 287 | |
| 288 | for (index = 0; index < edev->max_supported; index++) { |
| 289 | if (is_extcon_changed(old_state, edev->state, index, |
| 290 | &attached)) |
| 291 | raw_notifier_call_chain(&edev->nh[index], |
| 292 | attached, edev); |
| 293 | } |
| 294 | |
| 295 | /* This could be in interrupt handler */ |
| 296 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); |
| 297 | if (prop_buf) { |
| 298 | length = name_show(&edev->dev, NULL, prop_buf); |
| 299 | if (length > 0) { |
| 300 | if (prop_buf[length - 1] == '\n') |
| 301 | prop_buf[length - 1] = 0; |
| 302 | snprintf(name_buf, sizeof(name_buf), |
| 303 | "NAME=%s", prop_buf); |
| 304 | envp[env_offset++] = name_buf; |
| 305 | } |
| 306 | length = state_show(&edev->dev, NULL, prop_buf); |
| 307 | if (length > 0) { |
| 308 | if (prop_buf[length - 1] == '\n') |
| 309 | prop_buf[length - 1] = 0; |
| 310 | snprintf(state_buf, sizeof(state_buf), |
| 311 | "STATE=%s", prop_buf); |
| 312 | envp[env_offset++] = state_buf; |
| 313 | } |
| 314 | envp[env_offset] = NULL; |
| 315 | /* Unlock early before uevent */ |
| 316 | spin_unlock_irqrestore(&edev->lock, flags); |
| 317 | |
| 318 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
| 319 | free_page((unsigned long)prop_buf); |
| 320 | } else { |
| 321 | /* Unlock early before uevent */ |
| 322 | spin_unlock_irqrestore(&edev->lock, flags); |
| 323 | |
| 324 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
| 325 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); |
| 326 | } |
| 327 | } else { |
| 328 | /* No changes */ |
| 329 | spin_unlock_irqrestore(&edev->lock, flags); |
| 330 | } |
| 331 | |
| 332 | return 0; |
| 333 | } |
| 334 | EXPORT_SYMBOL_GPL(extcon_update_state); |
| 335 | |
| 336 | /** |
| 337 | * extcon_set_state() - Set the cable attach states of the extcon device. |
| 338 | * @edev: the extcon device |
| 339 | * @state: new cable attach status for @edev |
| 340 | * |
| 341 | * Note that notifier provides which bits are changed in the state |
| 342 | * variable with the val parameter (second) to the callback. |
| 343 | */ |
| 344 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
| 345 | { |
| 346 | if (!edev) |
| 347 | return -EINVAL; |
| 348 | |
| 349 | return extcon_update_state(edev, 0xffffffff, state); |
| 350 | } |
| 351 | EXPORT_SYMBOL_GPL(extcon_set_state); |
| 352 | |
| 353 | /** |
| 354 | * extcon_get_cable_state_() - Get the status of a specific cable. |
| 355 | * @edev: the extcon device that has the cable. |
| 356 | * @id: the unique id of each external connector in extcon enumeration. |
| 357 | */ |
| 358 | int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) |
| 359 | { |
| 360 | int index; |
| 361 | |
| 362 | if (!edev) |
| 363 | return -EINVAL; |
| 364 | |
| 365 | index = find_cable_index_by_id(edev, id); |
| 366 | if (index < 0) |
| 367 | return index; |
| 368 | |
| 369 | if (edev->max_supported && edev->max_supported <= index) |
| 370 | return -EINVAL; |
| 371 | |
| 372 | return !!(edev->state & (1 << index)); |
| 373 | } |
| 374 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); |
| 375 | |
| 376 | /** |
| 377 | * extcon_get_cable_state() - Get the status of a specific cable. |
| 378 | * @edev: the extcon device that has the cable. |
| 379 | * @cable_name: cable name. |
| 380 | * |
| 381 | * Note that this is slower than extcon_get_cable_state_. |
| 382 | */ |
| 383 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) |
| 384 | { |
| 385 | int id; |
| 386 | |
| 387 | id = find_cable_id_by_name(edev, cable_name); |
| 388 | if (id < 0) |
| 389 | return id; |
| 390 | |
| 391 | return extcon_get_cable_state_(edev, id); |
| 392 | } |
| 393 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); |
| 394 | |
| 395 | /** |
| 396 | * extcon_set_cable_state_() - Set the status of a specific cable. |
| 397 | * @edev: the extcon device that has the cable. |
| 398 | * @id: the unique id of each external connector |
| 399 | * in extcon enumeration. |
| 400 | * @state: the new cable status. The default semantics is |
| 401 | * true: attached / false: detached. |
| 402 | */ |
| 403 | int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, |
| 404 | bool cable_state) |
| 405 | { |
| 406 | u32 state; |
| 407 | int index; |
| 408 | |
| 409 | if (!edev) |
| 410 | return -EINVAL; |
| 411 | |
| 412 | index = find_cable_index_by_id(edev, id); |
| 413 | if (index < 0) |
| 414 | return index; |
| 415 | |
| 416 | if (edev->max_supported && edev->max_supported <= index) |
| 417 | return -EINVAL; |
| 418 | |
| 419 | state = cable_state ? (1 << index) : 0; |
| 420 | return extcon_update_state(edev, 1 << index, state); |
| 421 | } |
| 422 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); |
| 423 | |
| 424 | /** |
| 425 | * extcon_set_cable_state() - Set the status of a specific cable. |
| 426 | * @edev: the extcon device that has the cable. |
| 427 | * @cable_name: cable name. |
| 428 | * @cable_state: the new cable status. The default semantics is |
| 429 | * true: attached / false: detached. |
| 430 | * |
| 431 | * Note that this is slower than extcon_set_cable_state_. |
| 432 | */ |
| 433 | int extcon_set_cable_state(struct extcon_dev *edev, |
| 434 | const char *cable_name, bool cable_state) |
| 435 | { |
| 436 | int id; |
| 437 | |
| 438 | id = find_cable_id_by_name(edev, cable_name); |
| 439 | if (id < 0) |
| 440 | return id; |
| 441 | |
| 442 | return extcon_set_cable_state_(edev, id, cable_state); |
| 443 | } |
| 444 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); |
| 445 | |
| 446 | /** |
| 447 | * extcon_get_extcon_dev() - Get the extcon device instance from the name |
| 448 | * @extcon_name: The extcon name provided with extcon_dev_register() |
| 449 | */ |
| 450 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) |
| 451 | { |
| 452 | struct extcon_dev *sd; |
| 453 | |
| 454 | if (!extcon_name) |
| 455 | return ERR_PTR(-EINVAL); |
| 456 | |
| 457 | mutex_lock(&extcon_dev_list_lock); |
| 458 | list_for_each_entry(sd, &extcon_dev_list, entry) { |
| 459 | if (!strcmp(sd->name, extcon_name)) |
| 460 | goto out; |
| 461 | } |
| 462 | sd = NULL; |
| 463 | out: |
| 464 | mutex_unlock(&extcon_dev_list_lock); |
| 465 | return sd; |
| 466 | } |
| 467 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); |
| 468 | |
| 469 | /** |
| 470 | * extcon_register_interest() - Register a notifier for a state change of a |
| 471 | * specific cable, not an entier set of cables of a |
| 472 | * extcon device. |
| 473 | * @obj: an empty extcon_specific_cable_nb object to be returned. |
| 474 | * @extcon_name: the name of extcon device. |
| 475 | * if NULL, extcon_register_interest will register |
| 476 | * every cable with the target cable_name given. |
| 477 | * @cable_name: the target cable name. |
| 478 | * @nb: the notifier block to get notified. |
| 479 | * |
| 480 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets |
| 481 | * the struct for you. |
| 482 | * |
| 483 | * extcon_register_interest is a helper function for those who want to get |
| 484 | * notification for a single specific cable's status change. If a user wants |
| 485 | * to get notification for any changes of all cables of a extcon device, |
| 486 | * he/she should use the general extcon_register_notifier(). |
| 487 | * |
| 488 | * Note that the second parameter given to the callback of nb (val) is |
| 489 | * "old_state", not the current state. The current state can be retrieved |
| 490 | * by looking at the third pameter (edev pointer)'s state value. |
| 491 | */ |
| 492 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, |
| 493 | const char *extcon_name, const char *cable_name, |
| 494 | struct notifier_block *nb) |
| 495 | { |
| 496 | unsigned long flags; |
| 497 | int ret; |
| 498 | |
| 499 | if (!obj || !cable_name || !nb) |
| 500 | return -EINVAL; |
| 501 | |
| 502 | if (extcon_name) { |
| 503 | obj->edev = extcon_get_extcon_dev(extcon_name); |
| 504 | if (!obj->edev) |
| 505 | return -ENODEV; |
| 506 | |
| 507 | obj->cable_index = find_cable_index_by_name(obj->edev, |
| 508 | cable_name); |
| 509 | if (obj->cable_index < 0) |
| 510 | return obj->cable_index; |
| 511 | |
| 512 | obj->user_nb = nb; |
| 513 | |
| 514 | spin_lock_irqsave(&obj->edev->lock, flags); |
| 515 | ret = raw_notifier_chain_register( |
| 516 | &obj->edev->nh[obj->cable_index], |
| 517 | obj->user_nb); |
| 518 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
| 519 | } else { |
| 520 | struct class_dev_iter iter; |
| 521 | struct extcon_dev *extd; |
| 522 | struct device *dev; |
| 523 | |
| 524 | if (!extcon_class) |
| 525 | return -ENODEV; |
| 526 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); |
| 527 | while ((dev = class_dev_iter_next(&iter))) { |
| 528 | extd = dev_get_drvdata(dev); |
| 529 | |
| 530 | if (find_cable_index_by_name(extd, cable_name) < 0) |
| 531 | continue; |
| 532 | |
| 533 | class_dev_iter_exit(&iter); |
| 534 | return extcon_register_interest(obj, extd->name, |
| 535 | cable_name, nb); |
| 536 | } |
| 537 | |
| 538 | ret = -ENODEV; |
| 539 | } |
| 540 | |
| 541 | return ret; |
| 542 | } |
| 543 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
| 544 | |
| 545 | /** |
| 546 | * extcon_unregister_interest() - Unregister the notifier registered by |
| 547 | * extcon_register_interest(). |
| 548 | * @obj: the extcon_specific_cable_nb object returned by |
| 549 | * extcon_register_interest(). |
| 550 | */ |
| 551 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) |
| 552 | { |
| 553 | unsigned long flags; |
| 554 | int ret; |
| 555 | |
| 556 | if (!obj) |
| 557 | return -EINVAL; |
| 558 | |
| 559 | spin_lock_irqsave(&obj->edev->lock, flags); |
| 560 | ret = raw_notifier_chain_unregister( |
| 561 | &obj->edev->nh[obj->cable_index], obj->user_nb); |
| 562 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
| 563 | |
| 564 | return ret; |
| 565 | } |
| 566 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
| 567 | |
| 568 | /** |
| 569 | * extcon_register_notifier() - Register a notifiee to get notified by |
| 570 | * any attach status changes from the extcon. |
| 571 | * @edev: the extcon device that has the external connecotr. |
| 572 | * @id: the unique id of each external connector in extcon enumeration. |
| 573 | * @nb: a notifier block to be registered. |
| 574 | * |
| 575 | * Note that the second parameter given to the callback of nb (val) is |
| 576 | * "old_state", not the current state. The current state can be retrieved |
| 577 | * by looking at the third pameter (edev pointer)'s state value. |
| 578 | */ |
| 579 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
| 580 | struct notifier_block *nb) |
| 581 | { |
| 582 | unsigned long flags; |
| 583 | int ret, idx; |
| 584 | |
| 585 | if (!edev || !nb) |
| 586 | return -EINVAL; |
| 587 | |
| 588 | idx = find_cable_index_by_id(edev, id); |
| 589 | |
| 590 | spin_lock_irqsave(&edev->lock, flags); |
| 591 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); |
| 592 | spin_unlock_irqrestore(&edev->lock, flags); |
| 593 | |
| 594 | return ret; |
| 595 | } |
| 596 | EXPORT_SYMBOL_GPL(extcon_register_notifier); |
| 597 | |
| 598 | /** |
| 599 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
| 600 | * @edev: the extcon device that has the external connecotr. |
| 601 | * @id: the unique id of each external connector in extcon enumeration. |
| 602 | * @nb: a notifier block to be registered. |
| 603 | */ |
| 604 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
| 605 | struct notifier_block *nb) |
| 606 | { |
| 607 | unsigned long flags; |
| 608 | int ret, idx; |
| 609 | |
| 610 | if (!edev || !nb) |
| 611 | return -EINVAL; |
| 612 | |
| 613 | idx = find_cable_index_by_id(edev, id); |
| 614 | |
| 615 | spin_lock_irqsave(&edev->lock, flags); |
| 616 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
| 617 | spin_unlock_irqrestore(&edev->lock, flags); |
| 618 | |
| 619 | return ret; |
| 620 | } |
| 621 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); |
| 622 | |
| 623 | static struct attribute *extcon_attrs[] = { |
| 624 | &dev_attr_state.attr, |
| 625 | &dev_attr_name.attr, |
| 626 | NULL, |
| 627 | }; |
| 628 | ATTRIBUTE_GROUPS(extcon); |
| 629 | |
| 630 | static int create_extcon_class(void) |
| 631 | { |
| 632 | if (!extcon_class) { |
| 633 | extcon_class = class_create(THIS_MODULE, "extcon"); |
| 634 | if (IS_ERR(extcon_class)) |
| 635 | return PTR_ERR(extcon_class); |
| 636 | extcon_class->dev_groups = extcon_groups; |
| 637 | |
| 638 | #if defined(CONFIG_ANDROID) |
| 639 | switch_class = class_compat_register("switch"); |
| 640 | if (WARN(!switch_class, "cannot allocate")) |
| 641 | return -ENOMEM; |
| 642 | #endif /* CONFIG_ANDROID */ |
| 643 | } |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | static void extcon_dev_release(struct device *dev) |
| 649 | { |
| 650 | } |
| 651 | |
| 652 | static const char *muex_name = "mutually_exclusive"; |
| 653 | static void dummy_sysfs_dev_release(struct device *dev) |
| 654 | { |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * extcon_dev_allocate() - Allocate the memory of extcon device. |
| 659 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
| 660 | * If supported_cable is NULL, cable name related APIs |
| 661 | * are disabled. |
| 662 | * |
| 663 | * This function allocates the memory for extcon device without allocating |
| 664 | * memory in each extcon provider driver and initialize default setting for |
| 665 | * extcon device. |
| 666 | * |
| 667 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail |
| 668 | */ |
| 669 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
| 670 | { |
| 671 | struct extcon_dev *edev; |
| 672 | |
| 673 | if (!supported_cable) |
| 674 | return ERR_PTR(-EINVAL); |
| 675 | |
| 676 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
| 677 | if (!edev) |
| 678 | return ERR_PTR(-ENOMEM); |
| 679 | |
| 680 | edev->max_supported = 0; |
| 681 | edev->supported_cable = supported_cable; |
| 682 | |
| 683 | return edev; |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * extcon_dev_free() - Free the memory of extcon device. |
| 688 | * @edev: the extcon device to free |
| 689 | */ |
| 690 | void extcon_dev_free(struct extcon_dev *edev) |
| 691 | { |
| 692 | kfree(edev); |
| 693 | } |
| 694 | EXPORT_SYMBOL_GPL(extcon_dev_free); |
| 695 | |
| 696 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) |
| 697 | { |
| 698 | struct extcon_dev **r = res; |
| 699 | |
| 700 | if (WARN_ON(!r || !*r)) |
| 701 | return 0; |
| 702 | |
| 703 | return *r == data; |
| 704 | } |
| 705 | |
| 706 | static void devm_extcon_dev_release(struct device *dev, void *res) |
| 707 | { |
| 708 | extcon_dev_free(*(struct extcon_dev **)res); |
| 709 | } |
| 710 | |
| 711 | /** |
| 712 | * devm_extcon_dev_allocate - Allocate managed extcon device |
| 713 | * @dev: device owning the extcon device being created |
| 714 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
| 715 | * If supported_cable is NULL, cable name related APIs |
| 716 | * are disabled. |
| 717 | * |
| 718 | * This function manages automatically the memory of extcon device using device |
| 719 | * resource management and simplify the control of freeing the memory of extcon |
| 720 | * device. |
| 721 | * |
| 722 | * Returns the pointer memory of allocated extcon_dev if success |
| 723 | * or ERR_PTR(err) if fail |
| 724 | */ |
| 725 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, |
| 726 | const unsigned int *supported_cable) |
| 727 | { |
| 728 | struct extcon_dev **ptr, *edev; |
| 729 | |
| 730 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); |
| 731 | if (!ptr) |
| 732 | return ERR_PTR(-ENOMEM); |
| 733 | |
| 734 | edev = extcon_dev_allocate(supported_cable); |
| 735 | if (IS_ERR(edev)) { |
| 736 | devres_free(ptr); |
| 737 | return edev; |
| 738 | } |
| 739 | |
| 740 | edev->dev.parent = dev; |
| 741 | |
| 742 | *ptr = edev; |
| 743 | devres_add(dev, ptr); |
| 744 | |
| 745 | return edev; |
| 746 | } |
| 747 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); |
| 748 | |
| 749 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) |
| 750 | { |
| 751 | WARN_ON(devres_release(dev, devm_extcon_dev_release, |
| 752 | devm_extcon_dev_match, edev)); |
| 753 | } |
| 754 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); |
| 755 | |
| 756 | /** |
| 757 | * extcon_dev_register() - Register a new extcon device |
| 758 | * @edev : the new extcon device (should be allocated before calling) |
| 759 | * |
| 760 | * Among the members of edev struct, please set the "user initializing data" |
| 761 | * in any case and set the "optional callbacks" if required. However, please |
| 762 | * do not set the values of "internal data", which are initialized by |
| 763 | * this function. |
| 764 | */ |
| 765 | int extcon_dev_register(struct extcon_dev *edev) |
| 766 | { |
| 767 | int ret, index = 0; |
| 768 | static atomic_t edev_no = ATOMIC_INIT(-1); |
| 769 | |
| 770 | if (!extcon_class) { |
| 771 | ret = create_extcon_class(); |
| 772 | if (ret < 0) |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | if (!edev || !edev->supported_cable) |
| 777 | return -EINVAL; |
| 778 | |
| 779 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); |
| 780 | |
| 781 | edev->max_supported = index; |
| 782 | if (index > SUPPORTED_CABLE_MAX) { |
| 783 | dev_err(&edev->dev, |
| 784 | "exceed the maximum number of supported cables\n"); |
| 785 | return -EINVAL; |
| 786 | } |
| 787 | |
| 788 | edev->dev.class = extcon_class; |
| 789 | edev->dev.release = extcon_dev_release; |
| 790 | |
| 791 | edev->name = dev_name(edev->dev.parent); |
| 792 | if (IS_ERR_OR_NULL(edev->name)) { |
| 793 | dev_err(&edev->dev, |
| 794 | "extcon device name is null\n"); |
| 795 | return -EINVAL; |
| 796 | } |
| 797 | dev_set_name(&edev->dev, "extcon%lu", |
| 798 | (unsigned long)atomic_inc_return(&edev_no)); |
| 799 | |
| 800 | if (edev->max_supported) { |
| 801 | char buf[10]; |
| 802 | char *str; |
| 803 | struct extcon_cable *cable; |
| 804 | |
| 805 | edev->cables = kzalloc(sizeof(struct extcon_cable) * |
| 806 | edev->max_supported, GFP_KERNEL); |
| 807 | if (!edev->cables) { |
| 808 | ret = -ENOMEM; |
| 809 | goto err_sysfs_alloc; |
| 810 | } |
| 811 | for (index = 0; index < edev->max_supported; index++) { |
| 812 | cable = &edev->cables[index]; |
| 813 | |
| 814 | snprintf(buf, 10, "cable.%d", index); |
| 815 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), |
| 816 | GFP_KERNEL); |
| 817 | if (!str) { |
| 818 | for (index--; index >= 0; index--) { |
| 819 | cable = &edev->cables[index]; |
| 820 | kfree(cable->attr_g.name); |
| 821 | } |
| 822 | ret = -ENOMEM; |
| 823 | |
| 824 | goto err_alloc_cables; |
| 825 | } |
| 826 | strcpy(str, buf); |
| 827 | |
| 828 | cable->edev = edev; |
| 829 | cable->cable_index = index; |
| 830 | cable->attrs[0] = &cable->attr_name.attr; |
| 831 | cable->attrs[1] = &cable->attr_state.attr; |
| 832 | cable->attrs[2] = NULL; |
| 833 | cable->attr_g.name = str; |
| 834 | cable->attr_g.attrs = cable->attrs; |
| 835 | |
| 836 | sysfs_attr_init(&cable->attr_name.attr); |
| 837 | cable->attr_name.attr.name = "name"; |
| 838 | cable->attr_name.attr.mode = 0444; |
| 839 | cable->attr_name.show = cable_name_show; |
| 840 | |
| 841 | sysfs_attr_init(&cable->attr_state.attr); |
| 842 | cable->attr_state.attr.name = "state"; |
| 843 | cable->attr_state.attr.mode = 0444; |
| 844 | cable->attr_state.show = cable_state_show; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | if (edev->max_supported && edev->mutually_exclusive) { |
| 849 | char buf[80]; |
| 850 | char *name; |
| 851 | |
| 852 | /* Count the size of mutually_exclusive array */ |
| 853 | for (index = 0; edev->mutually_exclusive[index]; index++) |
| 854 | ; |
| 855 | |
| 856 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * |
| 857 | (index + 1), GFP_KERNEL); |
| 858 | if (!edev->attrs_muex) { |
| 859 | ret = -ENOMEM; |
| 860 | goto err_muex; |
| 861 | } |
| 862 | |
| 863 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * |
| 864 | index, GFP_KERNEL); |
| 865 | if (!edev->d_attrs_muex) { |
| 866 | ret = -ENOMEM; |
| 867 | kfree(edev->attrs_muex); |
| 868 | goto err_muex; |
| 869 | } |
| 870 | |
| 871 | for (index = 0; edev->mutually_exclusive[index]; index++) { |
| 872 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); |
| 873 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), |
| 874 | GFP_KERNEL); |
| 875 | if (!name) { |
| 876 | for (index--; index >= 0; index--) { |
| 877 | kfree(edev->d_attrs_muex[index].attr. |
| 878 | name); |
| 879 | } |
| 880 | kfree(edev->d_attrs_muex); |
| 881 | kfree(edev->attrs_muex); |
| 882 | ret = -ENOMEM; |
| 883 | goto err_muex; |
| 884 | } |
| 885 | strcpy(name, buf); |
| 886 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
| 887 | edev->d_attrs_muex[index].attr.name = name; |
| 888 | edev->d_attrs_muex[index].attr.mode = 0000; |
| 889 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] |
| 890 | .attr; |
| 891 | } |
| 892 | edev->attr_g_muex.name = muex_name; |
| 893 | edev->attr_g_muex.attrs = edev->attrs_muex; |
| 894 | |
| 895 | } |
| 896 | |
| 897 | if (edev->max_supported) { |
| 898 | edev->extcon_dev_type.groups = |
| 899 | kzalloc(sizeof(struct attribute_group *) * |
| 900 | (edev->max_supported + 2), GFP_KERNEL); |
| 901 | if (!edev->extcon_dev_type.groups) { |
| 902 | ret = -ENOMEM; |
| 903 | goto err_alloc_groups; |
| 904 | } |
| 905 | |
| 906 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
| 907 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
| 908 | |
| 909 | for (index = 0; index < edev->max_supported; index++) |
| 910 | edev->extcon_dev_type.groups[index] = |
| 911 | &edev->cables[index].attr_g; |
| 912 | if (edev->mutually_exclusive) |
| 913 | edev->extcon_dev_type.groups[index] = |
| 914 | &edev->attr_g_muex; |
| 915 | |
| 916 | edev->dev.type = &edev->extcon_dev_type; |
| 917 | } |
| 918 | |
| 919 | ret = device_register(&edev->dev); |
| 920 | if (ret) { |
| 921 | put_device(&edev->dev); |
| 922 | goto err_dev; |
| 923 | } |
| 924 | #if defined(CONFIG_ANDROID) |
| 925 | if (switch_class) |
| 926 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
| 927 | #endif /* CONFIG_ANDROID */ |
| 928 | |
| 929 | spin_lock_init(&edev->lock); |
| 930 | |
| 931 | edev->nh = devm_kzalloc(&edev->dev, |
| 932 | sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); |
| 933 | if (!edev->nh) { |
| 934 | ret = -ENOMEM; |
| 935 | goto err_dev; |
| 936 | } |
| 937 | |
| 938 | for (index = 0; index < edev->max_supported; index++) |
| 939 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); |
| 940 | |
| 941 | dev_set_drvdata(&edev->dev, edev); |
| 942 | edev->state = 0; |
| 943 | |
| 944 | mutex_lock(&extcon_dev_list_lock); |
| 945 | list_add(&edev->entry, &extcon_dev_list); |
| 946 | mutex_unlock(&extcon_dev_list_lock); |
| 947 | |
| 948 | return 0; |
| 949 | |
| 950 | err_dev: |
| 951 | if (edev->max_supported) |
| 952 | kfree(edev->extcon_dev_type.groups); |
| 953 | err_alloc_groups: |
| 954 | if (edev->max_supported && edev->mutually_exclusive) { |
| 955 | for (index = 0; edev->mutually_exclusive[index]; index++) |
| 956 | kfree(edev->d_attrs_muex[index].attr.name); |
| 957 | kfree(edev->d_attrs_muex); |
| 958 | kfree(edev->attrs_muex); |
| 959 | } |
| 960 | err_muex: |
| 961 | for (index = 0; index < edev->max_supported; index++) |
| 962 | kfree(edev->cables[index].attr_g.name); |
| 963 | err_alloc_cables: |
| 964 | if (edev->max_supported) |
| 965 | kfree(edev->cables); |
| 966 | err_sysfs_alloc: |
| 967 | return ret; |
| 968 | } |
| 969 | EXPORT_SYMBOL_GPL(extcon_dev_register); |
| 970 | |
| 971 | /** |
| 972 | * extcon_dev_unregister() - Unregister the extcon device. |
| 973 | * @edev: the extcon device instance to be unregistered. |
| 974 | * |
| 975 | * Note that this does not call kfree(edev) because edev was not allocated |
| 976 | * by this class. |
| 977 | */ |
| 978 | void extcon_dev_unregister(struct extcon_dev *edev) |
| 979 | { |
| 980 | int index; |
| 981 | |
| 982 | if (!edev) |
| 983 | return; |
| 984 | |
| 985 | mutex_lock(&extcon_dev_list_lock); |
| 986 | list_del(&edev->entry); |
| 987 | mutex_unlock(&extcon_dev_list_lock); |
| 988 | |
| 989 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
| 990 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", |
| 991 | dev_name(&edev->dev)); |
| 992 | return; |
| 993 | } |
| 994 | |
| 995 | device_unregister(&edev->dev); |
| 996 | |
| 997 | if (edev->mutually_exclusive && edev->max_supported) { |
| 998 | for (index = 0; edev->mutually_exclusive[index]; |
| 999 | index++) |
| 1000 | kfree(edev->d_attrs_muex[index].attr.name); |
| 1001 | kfree(edev->d_attrs_muex); |
| 1002 | kfree(edev->attrs_muex); |
| 1003 | } |
| 1004 | |
| 1005 | for (index = 0; index < edev->max_supported; index++) |
| 1006 | kfree(edev->cables[index].attr_g.name); |
| 1007 | |
| 1008 | if (edev->max_supported) { |
| 1009 | kfree(edev->extcon_dev_type.groups); |
| 1010 | kfree(edev->cables); |
| 1011 | } |
| 1012 | |
| 1013 | #if defined(CONFIG_ANDROID) |
| 1014 | if (switch_class) |
| 1015 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
| 1016 | #endif |
| 1017 | put_device(&edev->dev); |
| 1018 | } |
| 1019 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); |
| 1020 | |
| 1021 | static void devm_extcon_dev_unreg(struct device *dev, void *res) |
| 1022 | { |
| 1023 | extcon_dev_unregister(*(struct extcon_dev **)res); |
| 1024 | } |
| 1025 | |
| 1026 | /** |
| 1027 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() |
| 1028 | * @dev: device to allocate extcon device |
| 1029 | * @edev: the new extcon device to register |
| 1030 | * |
| 1031 | * Managed extcon_dev_register() function. If extcon device is attached with |
| 1032 | * this function, that extcon device is automatically unregistered on driver |
| 1033 | * detach. Internally this function calls extcon_dev_register() function. |
| 1034 | * To get more information, refer that function. |
| 1035 | * |
| 1036 | * If extcon device is registered with this function and the device needs to be |
| 1037 | * unregistered separately, devm_extcon_dev_unregister() should be used. |
| 1038 | * |
| 1039 | * Returns 0 if success or negaive error number if failure. |
| 1040 | */ |
| 1041 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) |
| 1042 | { |
| 1043 | struct extcon_dev **ptr; |
| 1044 | int ret; |
| 1045 | |
| 1046 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); |
| 1047 | if (!ptr) |
| 1048 | return -ENOMEM; |
| 1049 | |
| 1050 | ret = extcon_dev_register(edev); |
| 1051 | if (ret) { |
| 1052 | devres_free(ptr); |
| 1053 | return ret; |
| 1054 | } |
| 1055 | |
| 1056 | *ptr = edev; |
| 1057 | devres_add(dev, ptr); |
| 1058 | |
| 1059 | return 0; |
| 1060 | } |
| 1061 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); |
| 1062 | |
| 1063 | /** |
| 1064 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() |
| 1065 | * @dev: device the extcon belongs to |
| 1066 | * @edev: the extcon device to unregister |
| 1067 | * |
| 1068 | * Unregister extcon device that is registered with devm_extcon_dev_register() |
| 1069 | * function. |
| 1070 | */ |
| 1071 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) |
| 1072 | { |
| 1073 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, |
| 1074 | devm_extcon_dev_match, edev)); |
| 1075 | } |
| 1076 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); |
| 1077 | |
| 1078 | #ifdef CONFIG_OF |
| 1079 | /* |
| 1080 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree |
| 1081 | * @dev - instance to the given device |
| 1082 | * @index - index into list of extcon_dev |
| 1083 | * |
| 1084 | * return the instance of extcon device |
| 1085 | */ |
| 1086 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
| 1087 | { |
| 1088 | struct device_node *node; |
| 1089 | struct extcon_dev *edev; |
| 1090 | |
| 1091 | if (!dev) |
| 1092 | return ERR_PTR(-EINVAL); |
| 1093 | |
| 1094 | if (!dev->of_node) { |
| 1095 | dev_err(dev, "device does not have a device node entry\n"); |
| 1096 | return ERR_PTR(-EINVAL); |
| 1097 | } |
| 1098 | |
| 1099 | node = of_parse_phandle(dev->of_node, "extcon", index); |
| 1100 | if (!node) { |
| 1101 | dev_err(dev, "failed to get phandle in %s node\n", |
| 1102 | dev->of_node->full_name); |
| 1103 | return ERR_PTR(-ENODEV); |
| 1104 | } |
| 1105 | |
| 1106 | mutex_lock(&extcon_dev_list_lock); |
| 1107 | list_for_each_entry(edev, &extcon_dev_list, entry) { |
| 1108 | if (edev->dev.parent && edev->dev.parent->of_node == node) { |
| 1109 | mutex_unlock(&extcon_dev_list_lock); |
| 1110 | return edev; |
| 1111 | } |
| 1112 | } |
| 1113 | mutex_unlock(&extcon_dev_list_lock); |
| 1114 | |
| 1115 | return ERR_PTR(-EPROBE_DEFER); |
| 1116 | } |
| 1117 | #else |
| 1118 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
| 1119 | { |
| 1120 | return ERR_PTR(-ENOSYS); |
| 1121 | } |
| 1122 | #endif /* CONFIG_OF */ |
| 1123 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); |
| 1124 | |
| 1125 | /** |
| 1126 | * extcon_get_edev_name() - Get the name of the extcon device. |
| 1127 | * @edev: the extcon device |
| 1128 | */ |
| 1129 | const char *extcon_get_edev_name(struct extcon_dev *edev) |
| 1130 | { |
| 1131 | return !edev ? NULL : edev->name; |
| 1132 | } |
| 1133 | |
| 1134 | static int __init extcon_class_init(void) |
| 1135 | { |
| 1136 | return create_extcon_class(); |
| 1137 | } |
| 1138 | module_init(extcon_class_init); |
| 1139 | |
| 1140 | static void __exit extcon_class_exit(void) |
| 1141 | { |
| 1142 | #if defined(CONFIG_ANDROID) |
| 1143 | class_compat_unregister(switch_class); |
| 1144 | #endif |
| 1145 | class_destroy(extcon_class); |
| 1146 | } |
| 1147 | module_exit(extcon_class_exit); |
| 1148 | |
| 1149 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
| 1150 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
| 1151 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); |
| 1152 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
| 1153 | MODULE_DESCRIPTION("External connector (extcon) class driver"); |
| 1154 | MODULE_LICENSE("GPL"); |