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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 <[email protected]>
7 *
8 * Copyright (C) 2012 Samsung Electronics
9 * Author: Donggeun Kim <[email protected]>
10 * Author: MyungJoo Ham <[email protected]>
11 *
12 * based on android/drivers/switch/switch_class.c
13 * Copyright (C) 2008 Google, Inc.
14 * Author: Mike Lockwood <[email protected]>
15 */
16
17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/idr.h>
20#include <linux/init.h>
21#include <linux/device.h>
22#include <linux/fs.h>
23#include <linux/err.h>
24#include <linux/of.h>
25#include <linux/slab.h>
26#include <linux/sysfs.h>
27
28#include "extcon.h"
29
30#define SUPPORTED_CABLE_MAX 32
31
32static const struct __extcon_info {
33 unsigned int type;
34 unsigned int id;
35 const char *name;
36
37} extcon_info[] = {
38 [EXTCON_NONE] = {
39 .type = EXTCON_TYPE_MISC,
40 .id = EXTCON_NONE,
41 .name = "NONE",
42 },
43
44 /* USB external connector */
45 [EXTCON_USB] = {
46 .type = EXTCON_TYPE_USB,
47 .id = EXTCON_USB,
48 .name = "USB",
49 },
50 [EXTCON_USB_HOST] = {
51 .type = EXTCON_TYPE_USB,
52 .id = EXTCON_USB_HOST,
53 .name = "USB-HOST",
54 },
55
56 /* Charging external connector */
57 [EXTCON_CHG_USB_SDP] = {
58 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
59 .id = EXTCON_CHG_USB_SDP,
60 .name = "SDP",
61 },
62 [EXTCON_CHG_USB_DCP] = {
63 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
64 .id = EXTCON_CHG_USB_DCP,
65 .name = "DCP",
66 },
67 [EXTCON_CHG_USB_CDP] = {
68 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
69 .id = EXTCON_CHG_USB_CDP,
70 .name = "CDP",
71 },
72 [EXTCON_CHG_USB_ACA] = {
73 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
74 .id = EXTCON_CHG_USB_ACA,
75 .name = "ACA",
76 },
77 [EXTCON_CHG_USB_FAST] = {
78 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
79 .id = EXTCON_CHG_USB_FAST,
80 .name = "FAST-CHARGER",
81 },
82 [EXTCON_CHG_USB_SLOW] = {
83 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
84 .id = EXTCON_CHG_USB_SLOW,
85 .name = "SLOW-CHARGER",
86 },
87 [EXTCON_CHG_WPT] = {
88 .type = EXTCON_TYPE_CHG,
89 .id = EXTCON_CHG_WPT,
90 .name = "WPT",
91 },
92 [EXTCON_CHG_USB_PD] = {
93 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
94 .id = EXTCON_CHG_USB_PD,
95 .name = "PD",
96 },
97
98 /* Jack external connector */
99 [EXTCON_JACK_MICROPHONE] = {
100 .type = EXTCON_TYPE_JACK,
101 .id = EXTCON_JACK_MICROPHONE,
102 .name = "MICROPHONE",
103 },
104 [EXTCON_JACK_HEADPHONE] = {
105 .type = EXTCON_TYPE_JACK,
106 .id = EXTCON_JACK_HEADPHONE,
107 .name = "HEADPHONE",
108 },
109 [EXTCON_JACK_LINE_IN] = {
110 .type = EXTCON_TYPE_JACK,
111 .id = EXTCON_JACK_LINE_IN,
112 .name = "LINE-IN",
113 },
114 [EXTCON_JACK_LINE_OUT] = {
115 .type = EXTCON_TYPE_JACK,
116 .id = EXTCON_JACK_LINE_OUT,
117 .name = "LINE-OUT",
118 },
119 [EXTCON_JACK_VIDEO_IN] = {
120 .type = EXTCON_TYPE_JACK,
121 .id = EXTCON_JACK_VIDEO_IN,
122 .name = "VIDEO-IN",
123 },
124 [EXTCON_JACK_VIDEO_OUT] = {
125 .type = EXTCON_TYPE_JACK,
126 .id = EXTCON_JACK_VIDEO_OUT,
127 .name = "VIDEO-OUT",
128 },
129 [EXTCON_JACK_SPDIF_IN] = {
130 .type = EXTCON_TYPE_JACK,
131 .id = EXTCON_JACK_SPDIF_IN,
132 .name = "SPDIF-IN",
133 },
134 [EXTCON_JACK_SPDIF_OUT] = {
135 .type = EXTCON_TYPE_JACK,
136 .id = EXTCON_JACK_SPDIF_OUT,
137 .name = "SPDIF-OUT",
138 },
139
140 /* Display external connector */
141 [EXTCON_DISP_HDMI] = {
142 .type = EXTCON_TYPE_DISP,
143 .id = EXTCON_DISP_HDMI,
144 .name = "HDMI",
145 },
146 [EXTCON_DISP_MHL] = {
147 .type = EXTCON_TYPE_DISP,
148 .id = EXTCON_DISP_MHL,
149 .name = "MHL",
150 },
151 [EXTCON_DISP_DVI] = {
152 .type = EXTCON_TYPE_DISP,
153 .id = EXTCON_DISP_DVI,
154 .name = "DVI",
155 },
156 [EXTCON_DISP_VGA] = {
157 .type = EXTCON_TYPE_DISP,
158 .id = EXTCON_DISP_VGA,
159 .name = "VGA",
160 },
161 [EXTCON_DISP_DP] = {
162 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
163 .id = EXTCON_DISP_DP,
164 .name = "DP",
165 },
166 [EXTCON_DISP_HMD] = {
167 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
168 .id = EXTCON_DISP_HMD,
169 .name = "HMD",
170 },
171 [EXTCON_DISP_CVBS] = {
172 .type = EXTCON_TYPE_DISP,
173 .id = EXTCON_DISP_CVBS,
174 .name = "CVBS",
175 },
176 [EXTCON_DISP_EDP] = {
177 .type = EXTCON_TYPE_DISP,
178 .id = EXTCON_DISP_EDP,
179 .name = "EDP",
180 },
181
182 /* Miscellaneous external connector */
183 [EXTCON_DOCK] = {
184 .type = EXTCON_TYPE_MISC,
185 .id = EXTCON_DOCK,
186 .name = "DOCK",
187 },
188 [EXTCON_JIG] = {
189 .type = EXTCON_TYPE_MISC,
190 .id = EXTCON_JIG,
191 .name = "JIG",
192 },
193 [EXTCON_MECHANICAL] = {
194 .type = EXTCON_TYPE_MISC,
195 .id = EXTCON_MECHANICAL,
196 .name = "MECHANICAL",
197 },
198
199 { /* sentinel */ }
200};
201
202/**
203 * struct extcon_cable - An internal data for an external connector.
204 * @edev: the extcon device
205 * @cable_index: the index of this cable in the edev
206 * @attr_g: the attribute group for the cable
207 * @attr_name: "name" sysfs entry
208 * @attr_state: "state" sysfs entry
209 * @attrs: the array pointing to attr_name and attr_state for attr_g
210 * @usb_propval: the array of USB connector properties
211 * @chg_propval: the array of charger connector properties
212 * @jack_propval: the array of jack connector properties
213 * @disp_propval: the array of display connector properties
214 * @usb_bits: the bit array of the USB connector property capabilities
215 * @chg_bits: the bit array of the charger connector property capabilities
216 * @jack_bits: the bit array of the jack connector property capabilities
217 * @disp_bits: the bit array of the display connector property capabilities
218 */
219struct extcon_cable {
220 struct extcon_dev *edev;
221 int cable_index;
222
223 struct attribute_group attr_g;
224 struct device_attribute attr_name;
225 struct device_attribute attr_state;
226
227 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
228
229 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
230 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
231 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
232 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
233
234 DECLARE_BITMAP(usb_bits, EXTCON_PROP_USB_CNT);
235 DECLARE_BITMAP(chg_bits, EXTCON_PROP_CHG_CNT);
236 DECLARE_BITMAP(jack_bits, EXTCON_PROP_JACK_CNT);
237 DECLARE_BITMAP(disp_bits, EXTCON_PROP_DISP_CNT);
238};
239
240static struct class *extcon_class;
241
242static DEFINE_IDA(extcon_dev_ids);
243static LIST_HEAD(extcon_dev_list);
244static DEFINE_MUTEX(extcon_dev_list_lock);
245
246static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
247{
248 int i;
249
250 if (!edev->mutually_exclusive)
251 return 0;
252
253 for (i = 0; edev->mutually_exclusive[i]; i++) {
254 int weight;
255 u32 correspondants = new_state & edev->mutually_exclusive[i];
256
257 /* calculate the total number of bits set */
258 weight = hweight32(correspondants);
259 if (weight > 1)
260 return i + 1;
261 }
262
263 return 0;
264}
265
266static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
267{
268 int i;
269
270 /* Find the index of extcon cable in edev->supported_cable */
271 for (i = 0; i < edev->max_supported; i++) {
272 if (edev->supported_cable[i] == id)
273 return i;
274 }
275
276 return -EINVAL;
277}
278
279static int get_extcon_type(unsigned int prop)
280{
281 switch (prop) {
282 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
283 return EXTCON_TYPE_USB;
284 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
285 return EXTCON_TYPE_CHG;
286 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
287 return EXTCON_TYPE_JACK;
288 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
289 return EXTCON_TYPE_DISP;
290 default:
291 return -EINVAL;
292 }
293}
294
295static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
296{
297 return !!(edev->state & BIT(index));
298}
299
300static bool is_extcon_changed(struct extcon_dev *edev, int index,
301 bool new_state)
302{
303 int state = !!(edev->state & BIT(index));
304 return (state != new_state);
305}
306
307static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
308{
309 int type;
310
311 /* Check whether the property is supported or not. */
312 type = get_extcon_type(prop);
313 if (type < 0)
314 return false;
315
316 /* Check whether a specific extcon id supports the property or not. */
317 return !!(extcon_info[id].type & type);
318}
319
320static int is_extcon_property_capability(struct extcon_dev *edev,
321 unsigned int id, int index,unsigned int prop)
322{
323 struct extcon_cable *cable;
324 int type, ret;
325
326 /* Check whether the property is supported or not. */
327 type = get_extcon_type(prop);
328 if (type < 0)
329 return type;
330
331 cable = &edev->cables[index];
332
333 switch (type) {
334 case EXTCON_TYPE_USB:
335 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
336 break;
337 case EXTCON_TYPE_CHG:
338 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
339 break;
340 case EXTCON_TYPE_JACK:
341 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
342 break;
343 case EXTCON_TYPE_DISP:
344 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
345 break;
346 default:
347 ret = -EINVAL;
348 }
349
350 return ret;
351}
352
353static void init_property(struct extcon_dev *edev, unsigned int id, int index)
354{
355 unsigned int type = extcon_info[id].type;
356 struct extcon_cable *cable = &edev->cables[index];
357
358 if (EXTCON_TYPE_USB & type)
359 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
360 if (EXTCON_TYPE_CHG & type)
361 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
362 if (EXTCON_TYPE_JACK & type)
363 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
364 if (EXTCON_TYPE_DISP & type)
365 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
366}
367
368static ssize_t state_show(struct device *dev, struct device_attribute *attr,
369 char *buf)
370{
371 int i, count = 0;
372 struct extcon_dev *edev = dev_get_drvdata(dev);
373
374 if (edev->max_supported == 0)
375 return sysfs_emit(buf, "%u\n", edev->state);
376
377 for (i = 0; i < edev->max_supported; i++) {
378 count += sysfs_emit_at(buf, count, "%s=%d\n",
379 extcon_info[edev->supported_cable[i]].name,
380 !!(edev->state & BIT(i)));
381 }
382
383 return count;
384}
385static DEVICE_ATTR_RO(state);
386
387static ssize_t name_show(struct device *dev, struct device_attribute *attr,
388 char *buf)
389{
390 struct extcon_dev *edev = dev_get_drvdata(dev);
391
392 return sysfs_emit(buf, "%s\n", edev->name);
393}
394static DEVICE_ATTR_RO(name);
395
396static ssize_t cable_name_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
398{
399 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
400 attr_name);
401 int i = cable->cable_index;
402
403 return sysfs_emit(buf, "%s\n",
404 extcon_info[cable->edev->supported_cable[i]].name);
405}
406
407static ssize_t cable_state_show(struct device *dev,
408 struct device_attribute *attr, char *buf)
409{
410 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
411 attr_state);
412
413 int i = cable->cable_index;
414
415 return sysfs_emit(buf, "%d\n",
416 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
417}
418
419/**
420 * extcon_sync() - Synchronize the state for an external connector.
421 * @edev: the extcon device
422 * @id: the unique id indicating an external connector
423 *
424 * Note that this function send a notification in order to synchronize
425 * the state and property of an external connector.
426 *
427 * Returns 0 if success or error number if fail.
428 */
429int extcon_sync(struct extcon_dev *edev, unsigned int id)
430{
431 char name_buf[120];
432 char state_buf[120];
433 char *prop_buf;
434 char *envp[3];
435 int env_offset = 0;
436 int length;
437 int index;
438 int state;
439 unsigned long flags;
440
441 if (!edev)
442 return -EINVAL;
443
444 index = find_cable_index_by_id(edev, id);
445 if (index < 0)
446 return index;
447
448 spin_lock_irqsave(&edev->lock, flags);
449 state = !!(edev->state & BIT(index));
450 spin_unlock_irqrestore(&edev->lock, flags);
451
452 /*
453 * Call functions in a raw notifier chain for the specific one
454 * external connector.
455 */
456 raw_notifier_call_chain(&edev->nh[index], state, edev);
457
458 /*
459 * Call functions in a raw notifier chain for the all supported
460 * external connectors.
461 */
462 raw_notifier_call_chain(&edev->nh_all, state, edev);
463
464 spin_lock_irqsave(&edev->lock, flags);
465 /* This could be in interrupt handler */
466 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
467 if (!prop_buf) {
468 /* Unlock early before uevent */
469 spin_unlock_irqrestore(&edev->lock, flags);
470
471 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
472 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
473
474 return -ENOMEM;
475 }
476
477 length = name_show(&edev->dev, NULL, prop_buf);
478 if (length > 0) {
479 if (prop_buf[length - 1] == '\n')
480 prop_buf[length - 1] = 0;
481 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
482 envp[env_offset++] = name_buf;
483 }
484
485 length = state_show(&edev->dev, NULL, prop_buf);
486 if (length > 0) {
487 if (prop_buf[length - 1] == '\n')
488 prop_buf[length - 1] = 0;
489 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
490 envp[env_offset++] = state_buf;
491 }
492 envp[env_offset] = NULL;
493
494 /* Unlock early before uevent */
495 spin_unlock_irqrestore(&edev->lock, flags);
496 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
497 free_page((unsigned long)prop_buf);
498
499 return 0;
500}
501EXPORT_SYMBOL_GPL(extcon_sync);
502
503/**
504 * extcon_get_state() - Get the state of an external connector.
505 * @edev: the extcon device
506 * @id: the unique id indicating an external connector
507 *
508 * Returns 0 if success or error number if fail.
509 */
510int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
511{
512 int index, state;
513 unsigned long flags;
514
515 if (!edev)
516 return -EINVAL;
517
518 index = find_cable_index_by_id(edev, id);
519 if (index < 0)
520 return index;
521
522 spin_lock_irqsave(&edev->lock, flags);
523 state = is_extcon_attached(edev, index);
524 spin_unlock_irqrestore(&edev->lock, flags);
525
526 return state;
527}
528EXPORT_SYMBOL_GPL(extcon_get_state);
529
530/**
531 * extcon_set_state() - Set the state of an external connector.
532 * @edev: the extcon device
533 * @id: the unique id indicating an external connector
534 * @state: the new state of an external connector.
535 * the default semantics is true: attached / false: detached.
536 *
537 * Note that this function set the state of an external connector without
538 * a notification. To synchronize the state of an external connector,
539 * have to use extcon_set_state_sync() and extcon_sync().
540 *
541 * Returns 0 if success or error number if fail.
542 */
543int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
544{
545 unsigned long flags;
546 int index, ret = 0;
547
548 if (!edev)
549 return -EINVAL;
550
551 index = find_cable_index_by_id(edev, id);
552 if (index < 0)
553 return index;
554
555 spin_lock_irqsave(&edev->lock, flags);
556
557 /* Check whether the external connector's state is changed. */
558 if (!is_extcon_changed(edev, index, state))
559 goto out;
560
561 if (check_mutually_exclusive(edev,
562 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
563 ret = -EPERM;
564 goto out;
565 }
566
567 /*
568 * Initialize the value of extcon property before setting
569 * the detached state for an external connector.
570 */
571 if (!state)
572 init_property(edev, id, index);
573
574 /* Update the state for an external connector. */
575 if (state)
576 edev->state |= BIT(index);
577 else
578 edev->state &= ~(BIT(index));
579out:
580 spin_unlock_irqrestore(&edev->lock, flags);
581
582 return ret;
583}
584EXPORT_SYMBOL_GPL(extcon_set_state);
585
586/**
587 * extcon_set_state_sync() - Set the state of an external connector with sync.
588 * @edev: the extcon device
589 * @id: the unique id indicating an external connector
590 * @state: the new state of external connector.
591 * the default semantics is true: attached / false: detached.
592 *
593 * Note that this function set the state of external connector
594 * and synchronize the state by sending a notification.
595 *
596 * Returns 0 if success or error number if fail.
597 */
598int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
599{
600 int ret;
601
602 ret = extcon_set_state(edev, id, state);
603 if (ret < 0)
604 return ret;
605
606 return extcon_sync(edev, id);
607}
608EXPORT_SYMBOL_GPL(extcon_set_state_sync);
609
610/**
611 * extcon_get_property() - Get the property value of an external connector.
612 * @edev: the extcon device
613 * @id: the unique id indicating an external connector
614 * @prop: the property id indicating an extcon property
615 * @prop_val: the pointer which store the value of extcon property
616 *
617 * Note that when getting the property value of external connector,
618 * the external connector should be attached. If detached state, function
619 * return 0 without property value. Also, the each property should be
620 * included in the list of supported properties according to extcon type.
621 *
622 * Returns 0 if success or error number if fail.
623 */
624int extcon_get_property(struct extcon_dev *edev, unsigned int id,
625 unsigned int prop,
626 union extcon_property_value *prop_val)
627{
628 struct extcon_cable *cable;
629 unsigned long flags;
630 int index, ret = 0;
631
632 *prop_val = (union extcon_property_value){0};
633
634 if (!edev)
635 return -EINVAL;
636
637 /* Check whether the property is supported or not */
638 if (!is_extcon_property_supported(id, prop))
639 return -EINVAL;
640
641 /* Find the cable index of external connector by using id */
642 index = find_cable_index_by_id(edev, id);
643 if (index < 0)
644 return index;
645
646 spin_lock_irqsave(&edev->lock, flags);
647
648 /* Check whether the property is available or not. */
649 if (!is_extcon_property_capability(edev, id, index, prop)) {
650 spin_unlock_irqrestore(&edev->lock, flags);
651 return -EPERM;
652 }
653
654 /*
655 * Check whether the external connector is attached.
656 * If external connector is detached, the user can not
657 * get the property value.
658 */
659 if (!is_extcon_attached(edev, index)) {
660 spin_unlock_irqrestore(&edev->lock, flags);
661 return 0;
662 }
663
664 cable = &edev->cables[index];
665
666 /* Get the property value according to extcon type */
667 switch (prop) {
668 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
669 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
670 break;
671 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
672 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
673 break;
674 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
675 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
676 break;
677 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
678 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
679 break;
680 default:
681 ret = -EINVAL;
682 break;
683 }
684
685 spin_unlock_irqrestore(&edev->lock, flags);
686
687 return ret;
688}
689EXPORT_SYMBOL_GPL(extcon_get_property);
690
691/**
692 * extcon_set_property() - Set the property value of an external connector.
693 * @edev: the extcon device
694 * @id: the unique id indicating an external connector
695 * @prop: the property id indicating an extcon property
696 * @prop_val: the pointer including the new value of extcon property
697 *
698 * Note that each property should be included in the list of supported
699 * properties according to the extcon type.
700 *
701 * Returns 0 if success or error number if fail.
702 */
703int extcon_set_property(struct extcon_dev *edev, unsigned int id,
704 unsigned int prop,
705 union extcon_property_value prop_val)
706{
707 struct extcon_cable *cable;
708 unsigned long flags;
709 int index, ret = 0;
710
711 if (!edev)
712 return -EINVAL;
713
714 /* Check whether the property is supported or not */
715 if (!is_extcon_property_supported(id, prop))
716 return -EINVAL;
717
718 /* Find the cable index of external connector by using id */
719 index = find_cable_index_by_id(edev, id);
720 if (index < 0)
721 return index;
722
723 spin_lock_irqsave(&edev->lock, flags);
724
725 /* Check whether the property is available or not. */
726 if (!is_extcon_property_capability(edev, id, index, prop)) {
727 spin_unlock_irqrestore(&edev->lock, flags);
728 return -EPERM;
729 }
730
731 cable = &edev->cables[index];
732
733 /* Set the property value according to extcon type */
734 switch (prop) {
735 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
736 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
737 break;
738 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
739 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
740 break;
741 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
742 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
743 break;
744 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
745 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
746 break;
747 default:
748 ret = -EINVAL;
749 break;
750 }
751
752 spin_unlock_irqrestore(&edev->lock, flags);
753
754 return ret;
755}
756EXPORT_SYMBOL_GPL(extcon_set_property);
757
758/**
759 * extcon_set_property_sync() - Set property of an external connector with sync.
760 * @edev: the extcon device
761 * @id: the unique id indicating an external connector
762 * @prop: the property id indicating an extcon property
763 * @prop_val: the pointer including the new value of extcon property
764 *
765 * Note that when setting the property value of external connector,
766 * the external connector should be attached. The each property should
767 * be included in the list of supported properties according to extcon type.
768 *
769 * Returns 0 if success or error number if fail.
770 */
771int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
772 unsigned int prop,
773 union extcon_property_value prop_val)
774{
775 int ret;
776
777 ret = extcon_set_property(edev, id, prop, prop_val);
778 if (ret < 0)
779 return ret;
780
781 return extcon_sync(edev, id);
782}
783EXPORT_SYMBOL_GPL(extcon_set_property_sync);
784
785/**
786 * extcon_get_property_capability() - Get the capability of the property
787 * for an external connector.
788 * @edev: the extcon device
789 * @id: the unique id indicating an external connector
790 * @prop: the property id indicating an extcon property
791 *
792 * Returns 1 if the property is available or 0 if not available.
793 */
794int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
795 unsigned int prop)
796{
797 int index;
798
799 if (!edev)
800 return -EINVAL;
801
802 /* Check whether the property is supported or not */
803 if (!is_extcon_property_supported(id, prop))
804 return -EINVAL;
805
806 /* Find the cable index of external connector by using id */
807 index = find_cable_index_by_id(edev, id);
808 if (index < 0)
809 return index;
810
811 return is_extcon_property_capability(edev, id, index, prop);
812}
813EXPORT_SYMBOL_GPL(extcon_get_property_capability);
814
815/**
816 * extcon_set_property_capability() - Set the capability of the property
817 * for an external connector.
818 * @edev: the extcon device
819 * @id: the unique id indicating an external connector
820 * @prop: the property id indicating an extcon property
821 *
822 * Note that this function set the capability of the property
823 * for an external connector in order to mark the bit in capability
824 * bitmap which mean the available state of the property.
825 *
826 * Returns 0 if success or error number if fail.
827 */
828int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
829 unsigned int prop)
830{
831 struct extcon_cable *cable;
832 int index, type, ret = 0;
833
834 if (!edev)
835 return -EINVAL;
836
837 /* Check whether the property is supported or not. */
838 if (!is_extcon_property_supported(id, prop))
839 return -EINVAL;
840
841 /* Find the cable index of external connector by using id. */
842 index = find_cable_index_by_id(edev, id);
843 if (index < 0)
844 return index;
845
846 type = get_extcon_type(prop);
847 if (type < 0)
848 return type;
849
850 cable = &edev->cables[index];
851
852 switch (type) {
853 case EXTCON_TYPE_USB:
854 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
855 break;
856 case EXTCON_TYPE_CHG:
857 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
858 break;
859 case EXTCON_TYPE_JACK:
860 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
861 break;
862 case EXTCON_TYPE_DISP:
863 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
864 break;
865 default:
866 ret = -EINVAL;
867 }
868
869 return ret;
870}
871EXPORT_SYMBOL_GPL(extcon_set_property_capability);
872
873/**
874 * extcon_get_extcon_dev() - Get the extcon device instance from the name.
875 * @extcon_name: the extcon name provided with extcon_dev_register()
876 *
877 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
878 * NOTE: This function returns -EPROBE_DEFER so it may only be called from
879 * probe() functions.
880 */
881struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
882{
883 struct extcon_dev *sd;
884
885 if (!extcon_name)
886 return ERR_PTR(-EINVAL);
887
888 mutex_lock(&extcon_dev_list_lock);
889 list_for_each_entry(sd, &extcon_dev_list, entry) {
890 if (!strcmp(sd->name, extcon_name))
891 goto out;
892 }
893 sd = ERR_PTR(-EPROBE_DEFER);
894out:
895 mutex_unlock(&extcon_dev_list_lock);
896 return sd;
897}
898EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
899
900/**
901 * extcon_register_notifier() - Register a notifier block to get notified by
902 * any state changes from the extcon.
903 * @edev: the extcon device
904 * @id: the unique id indicating an external connector
905 * @nb: a notifier block to be registered
906 *
907 * Note that the second parameter given to the callback of nb (val) is
908 * the current state of an external connector and the third pameter
909 * is the pointer of extcon device.
910 *
911 * Returns 0 if success or error number if fail.
912 */
913int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
914 struct notifier_block *nb)
915{
916 unsigned long flags;
917 int ret, idx;
918
919 if (!edev || !nb)
920 return -EINVAL;
921
922 idx = find_cable_index_by_id(edev, id);
923 if (idx < 0)
924 return idx;
925
926 spin_lock_irqsave(&edev->lock, flags);
927 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
928 spin_unlock_irqrestore(&edev->lock, flags);
929
930 return ret;
931}
932EXPORT_SYMBOL_GPL(extcon_register_notifier);
933
934/**
935 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
936 * @edev: the extcon device
937 * @id: the unique id indicating an external connector
938 * @nb: a notifier block to be registered
939 *
940 * Returns 0 if success or error number if fail.
941 */
942int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
943 struct notifier_block *nb)
944{
945 unsigned long flags;
946 int ret, idx;
947
948 if (!edev || !nb)
949 return -EINVAL;
950
951 idx = find_cable_index_by_id(edev, id);
952 if (idx < 0)
953 return idx;
954
955 spin_lock_irqsave(&edev->lock, flags);
956 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
957 spin_unlock_irqrestore(&edev->lock, flags);
958
959 return ret;
960}
961EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
962
963/**
964 * extcon_register_notifier_all() - Register a notifier block for all connectors.
965 * @edev: the extcon device
966 * @nb: a notifier block to be registered
967 *
968 * Note that this function registers a notifier block in order to receive
969 * the state change of all supported external connectors from extcon device.
970 * And the second parameter given to the callback of nb (val) is
971 * the current state and the third pameter is the pointer of extcon device.
972 *
973 * Returns 0 if success or error number if fail.
974 */
975int extcon_register_notifier_all(struct extcon_dev *edev,
976 struct notifier_block *nb)
977{
978 unsigned long flags;
979 int ret;
980
981 if (!edev || !nb)
982 return -EINVAL;
983
984 spin_lock_irqsave(&edev->lock, flags);
985 ret = raw_notifier_chain_register(&edev->nh_all, nb);
986 spin_unlock_irqrestore(&edev->lock, flags);
987
988 return ret;
989}
990EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
991
992/**
993 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
994 * @edev: the extcon device
995 * @nb: a notifier block to be registered
996 *
997 * Returns 0 if success or error number if fail.
998 */
999int extcon_unregister_notifier_all(struct extcon_dev *edev,
1000 struct notifier_block *nb)
1001{
1002 unsigned long flags;
1003 int ret;
1004
1005 if (!edev || !nb)
1006 return -EINVAL;
1007
1008 spin_lock_irqsave(&edev->lock, flags);
1009 ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
1010 spin_unlock_irqrestore(&edev->lock, flags);
1011
1012 return ret;
1013}
1014EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1015
1016static struct attribute *extcon_attrs[] = {
1017 &dev_attr_state.attr,
1018 &dev_attr_name.attr,
1019 NULL,
1020};
1021ATTRIBUTE_GROUPS(extcon);
1022
1023static int create_extcon_class(void)
1024{
1025 if (extcon_class)
1026 return 0;
1027
1028 extcon_class = class_create("extcon");
1029 if (IS_ERR(extcon_class))
1030 return PTR_ERR(extcon_class);
1031 extcon_class->dev_groups = extcon_groups;
1032
1033 return 0;
1034}
1035
1036static void extcon_dev_release(struct device *dev)
1037{
1038}
1039
1040static const char *muex_name = "mutually_exclusive";
1041static void dummy_sysfs_dev_release(struct device *dev)
1042{
1043}
1044
1045/*
1046 * extcon_dev_allocate() - Allocate the memory of extcon device.
1047 * @supported_cable: the array of the supported external connectors
1048 * ending with EXTCON_NONE.
1049 *
1050 * Note that this function allocates the memory for extcon device
1051 * and initialize default setting for the extcon device.
1052 *
1053 * Returns the pointer memory of allocated extcon_dev if success
1054 * or ERR_PTR(err) if fail.
1055 */
1056struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1057{
1058 struct extcon_dev *edev;
1059
1060 if (!supported_cable)
1061 return ERR_PTR(-EINVAL);
1062
1063 edev = kzalloc_obj(*edev);
1064 if (!edev)
1065 return ERR_PTR(-ENOMEM);
1066
1067 edev->max_supported = 0;
1068 edev->supported_cable = supported_cable;
1069
1070 return edev;
1071}
1072
1073/*
1074 * extcon_dev_free() - Free the memory of extcon device.
1075 * @edev: the extcon device
1076 */
1077void extcon_dev_free(struct extcon_dev *edev)
1078{
1079 kfree(edev);
1080}
1081EXPORT_SYMBOL_GPL(extcon_dev_free);
1082
1083/**
1084 * extcon_alloc_cables() - alloc the cables for extcon device
1085 * @edev: extcon device which has cables
1086 *
1087 * Returns 0 if success or error number if fail.
1088 */
1089static int extcon_alloc_cables(struct extcon_dev *edev)
1090{
1091 int index;
1092 char *str;
1093 struct extcon_cable *cable;
1094
1095 if (!edev)
1096 return -EINVAL;
1097
1098 if (!edev->max_supported)
1099 return 0;
1100
1101 edev->cables = kzalloc_objs(*edev->cables, edev->max_supported);
1102 if (!edev->cables)
1103 return -ENOMEM;
1104
1105 for (index = 0; index < edev->max_supported; index++) {
1106 cable = &edev->cables[index];
1107
1108 str = kasprintf(GFP_KERNEL, "cable.%d", index);
1109 if (!str) {
1110 for (index--; index >= 0; index--) {
1111 cable = &edev->cables[index];
1112 kfree(cable->attr_g.name);
1113 }
1114
1115 kfree(edev->cables);
1116 return -ENOMEM;
1117 }
1118
1119 cable->edev = edev;
1120 cable->cable_index = index;
1121 cable->attrs[0] = &cable->attr_name.attr;
1122 cable->attrs[1] = &cable->attr_state.attr;
1123 cable->attrs[2] = NULL;
1124 cable->attr_g.name = str;
1125 cable->attr_g.attrs = cable->attrs;
1126
1127 sysfs_attr_init(&cable->attr_name.attr);
1128 cable->attr_name.attr.name = "name";
1129 cable->attr_name.attr.mode = 0444;
1130 cable->attr_name.show = cable_name_show;
1131
1132 sysfs_attr_init(&cable->attr_state.attr);
1133 cable->attr_state.attr.name = "state";
1134 cable->attr_state.attr.mode = 0444;
1135 cable->attr_state.show = cable_state_show;
1136 }
1137
1138 return 0;
1139}
1140
1141/**
1142 * extcon_alloc_muex() - alloc the mutual exclusive for extcon device
1143 * @edev: extcon device
1144 *
1145 * Returns 0 if success or error number if fail.
1146 */
1147static int extcon_alloc_muex(struct extcon_dev *edev)
1148{
1149 char *name;
1150 int index;
1151
1152 if (!edev)
1153 return -EINVAL;
1154
1155 if (!(edev->max_supported && edev->mutually_exclusive))
1156 return 0;
1157
1158 /* Count the size of mutually_exclusive array */
1159 for (index = 0; edev->mutually_exclusive[index]; index++)
1160 ;
1161
1162 edev->attrs_muex = kzalloc_objs(*edev->attrs_muex, index + 1);
1163 if (!edev->attrs_muex)
1164 return -ENOMEM;
1165
1166 edev->d_attrs_muex = kzalloc_objs(*edev->d_attrs_muex, index);
1167 if (!edev->d_attrs_muex) {
1168 kfree(edev->attrs_muex);
1169 return -ENOMEM;
1170 }
1171
1172 for (index = 0; edev->mutually_exclusive[index]; index++) {
1173 name = kasprintf(GFP_KERNEL, "0x%x",
1174 edev->mutually_exclusive[index]);
1175 if (!name) {
1176 for (index--; index >= 0; index--)
1177 kfree(edev->d_attrs_muex[index].attr.name);
1178
1179 kfree(edev->d_attrs_muex);
1180 kfree(edev->attrs_muex);
1181 return -ENOMEM;
1182 }
1183 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1184 edev->d_attrs_muex[index].attr.name = name;
1185 edev->d_attrs_muex[index].attr.mode = 0000;
1186 edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr;
1187 }
1188 edev->attr_g_muex.name = muex_name;
1189 edev->attr_g_muex.attrs = edev->attrs_muex;
1190
1191 return 0;
1192}
1193
1194/**
1195 * extcon_alloc_groups() - alloc the groups for extcon device
1196 * @edev: extcon device
1197 *
1198 * Returns 0 if success or error number if fail.
1199 */
1200static int extcon_alloc_groups(struct extcon_dev *edev)
1201{
1202 int index;
1203
1204 if (!edev)
1205 return -EINVAL;
1206
1207 if (!edev->max_supported)
1208 return 0;
1209
1210 edev->extcon_dev_type.groups = kzalloc_objs(*edev->extcon_dev_type.groups,
1211 edev->max_supported + 2);
1212 if (!edev->extcon_dev_type.groups)
1213 return -ENOMEM;
1214
1215 edev->extcon_dev_type.name = dev_name(&edev->dev);
1216 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1217
1218 for (index = 0; index < edev->max_supported; index++)
1219 edev->extcon_dev_type.groups[index] = &edev->cables[index].attr_g;
1220
1221 if (edev->mutually_exclusive)
1222 edev->extcon_dev_type.groups[index] = &edev->attr_g_muex;
1223
1224 edev->dev.type = &edev->extcon_dev_type;
1225
1226 return 0;
1227}
1228
1229/**
1230 * extcon_dev_register() - Register an new extcon device
1231 * @edev: the extcon device to be registered
1232 *
1233 * Among the members of edev struct, please set the "user initializing data"
1234 * do not set the values of "internal data", which are initialized by
1235 * this function.
1236 *
1237 * Note that before calling this funciton, have to allocate the memory
1238 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1239 * dev should include the supported_cable information.
1240 *
1241 * Returns 0 if success or error number if fail.
1242 */
1243int extcon_dev_register(struct extcon_dev *edev)
1244{
1245 int ret, index;
1246
1247 ret = create_extcon_class();
1248 if (ret < 0)
1249 return ret;
1250
1251 if (!edev || !edev->supported_cable)
1252 return -EINVAL;
1253
1254 for (index = 0; edev->supported_cable[index] != EXTCON_NONE; index++);
1255
1256 edev->max_supported = index;
1257 if (index > SUPPORTED_CABLE_MAX) {
1258 dev_err(&edev->dev,
1259 "exceed the maximum number of supported cables\n");
1260 return -EINVAL;
1261 }
1262
1263 edev->dev.class = extcon_class;
1264 edev->dev.release = extcon_dev_release;
1265
1266 edev->name = dev_name(edev->dev.parent);
1267 if (IS_ERR_OR_NULL(edev->name)) {
1268 dev_err(&edev->dev,
1269 "extcon device name is null\n");
1270 return -EINVAL;
1271 }
1272
1273 ret = ida_alloc(&extcon_dev_ids, GFP_KERNEL);
1274 if (ret < 0)
1275 return ret;
1276
1277 edev->id = ret;
1278
1279 ret = extcon_alloc_cables(edev);
1280 if (ret < 0)
1281 goto err_alloc_cables;
1282
1283 ret = extcon_alloc_muex(edev);
1284 if (ret < 0)
1285 goto err_alloc_muex;
1286
1287 ret = extcon_alloc_groups(edev);
1288 if (ret < 0)
1289 goto err_alloc_groups;
1290
1291 spin_lock_init(&edev->lock);
1292 if (edev->max_supported) {
1293 edev->nh = kzalloc_objs(*edev->nh, edev->max_supported);
1294 if (!edev->nh) {
1295 ret = -ENOMEM;
1296 goto err_alloc_nh;
1297 }
1298 }
1299
1300 for (index = 0; index < edev->max_supported; index++)
1301 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1302
1303 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1304
1305 dev_set_drvdata(&edev->dev, edev);
1306 dev_set_name(&edev->dev, "extcon%d", edev->id);
1307 edev->state = 0;
1308
1309 ret = device_register(&edev->dev);
1310 if (ret) {
1311 put_device(&edev->dev);
1312 goto err_dev;
1313 }
1314
1315 mutex_lock(&extcon_dev_list_lock);
1316 list_add(&edev->entry, &extcon_dev_list);
1317 mutex_unlock(&extcon_dev_list_lock);
1318
1319 return 0;
1320
1321err_dev:
1322 if (edev->max_supported)
1323 kfree(edev->nh);
1324err_alloc_nh:
1325 if (edev->max_supported)
1326 kfree(edev->extcon_dev_type.groups);
1327err_alloc_groups:
1328 if (edev->max_supported && edev->mutually_exclusive) {
1329 for (index = 0; edev->mutually_exclusive[index]; index++)
1330 kfree(edev->d_attrs_muex[index].attr.name);
1331 kfree(edev->d_attrs_muex);
1332 kfree(edev->attrs_muex);
1333 }
1334err_alloc_muex:
1335 for (index = 0; index < edev->max_supported; index++)
1336 kfree(edev->cables[index].attr_g.name);
1337 if (edev->max_supported)
1338 kfree(edev->cables);
1339err_alloc_cables:
1340 ida_free(&extcon_dev_ids, edev->id);
1341
1342 return ret;
1343}
1344EXPORT_SYMBOL_GPL(extcon_dev_register);
1345
1346/**
1347 * extcon_dev_unregister() - Unregister the extcon device.
1348 * @edev: the extcon device to be unregistered.
1349 *
1350 * Note that this does not call kfree(edev) because edev was not allocated
1351 * by this class.
1352 */
1353void extcon_dev_unregister(struct extcon_dev *edev)
1354{
1355 int index;
1356
1357 if (!edev)
1358 return;
1359
1360 mutex_lock(&extcon_dev_list_lock);
1361 list_del(&edev->entry);
1362 mutex_unlock(&extcon_dev_list_lock);
1363
1364 if (!get_device(&edev->dev)) {
1365 dev_err(&edev->dev, "Failed to unregister extcon_dev\n");
1366 return;
1367 }
1368
1369 device_unregister(&edev->dev);
1370
1371 ida_free(&extcon_dev_ids, edev->id);
1372
1373 if (edev->mutually_exclusive && edev->max_supported) {
1374 for (index = 0; edev->mutually_exclusive[index];
1375 index++)
1376 kfree(edev->d_attrs_muex[index].attr.name);
1377 kfree(edev->d_attrs_muex);
1378 kfree(edev->attrs_muex);
1379 }
1380
1381 for (index = 0; index < edev->max_supported; index++)
1382 kfree(edev->cables[index].attr_g.name);
1383
1384 if (edev->max_supported) {
1385 kfree(edev->extcon_dev_type.groups);
1386 kfree(edev->cables);
1387 kfree(edev->nh);
1388 }
1389
1390 put_device(&edev->dev);
1391}
1392EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1393
1394#ifdef CONFIG_OF
1395
1396/*
1397 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1398 * @node : OF node identifying edev
1399 *
1400 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1401 */
1402struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1403{
1404 struct extcon_dev *edev;
1405
1406 mutex_lock(&extcon_dev_list_lock);
1407 list_for_each_entry(edev, &extcon_dev_list, entry)
1408 if (edev->dev.parent && device_match_of_node(edev->dev.parent, node))
1409 goto out;
1410 edev = ERR_PTR(-EPROBE_DEFER);
1411out:
1412 mutex_unlock(&extcon_dev_list_lock);
1413
1414 return edev;
1415}
1416
1417/*
1418 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1419 * @dev : the instance to the given device
1420 * @index : the index into list of extcon_dev
1421 *
1422 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1423 */
1424struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1425{
1426 struct device_node *node, *np = dev_of_node(dev);
1427 struct extcon_dev *edev;
1428
1429 if (!np) {
1430 dev_dbg(dev, "device does not have a device node entry\n");
1431 return ERR_PTR(-EINVAL);
1432 }
1433
1434 node = of_parse_phandle(np, "extcon", index);
1435 if (!node) {
1436 dev_dbg(dev, "failed to get phandle in %pOF node\n", np);
1437 return ERR_PTR(-ENODEV);
1438 }
1439
1440 edev = extcon_find_edev_by_node(node);
1441 of_node_put(node);
1442
1443 return edev;
1444}
1445
1446#else
1447
1448struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1449{
1450 return ERR_PTR(-ENOSYS);
1451}
1452
1453struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1454{
1455 return ERR_PTR(-ENOSYS);
1456}
1457
1458#endif /* CONFIG_OF */
1459
1460EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1461EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1462
1463/**
1464 * extcon_get_edev_name() - Get the name of the extcon device.
1465 * @edev: the extcon device
1466 */
1467const char *extcon_get_edev_name(struct extcon_dev *edev)
1468{
1469 return !edev ? NULL : edev->name;
1470}
1471EXPORT_SYMBOL_GPL(extcon_get_edev_name);
1472
1473static int __init extcon_class_init(void)
1474{
1475 return create_extcon_class();
1476}
1477module_init(extcon_class_init);
1478
1479static void __exit extcon_class_exit(void)
1480{
1481 class_destroy(extcon_class);
1482}
1483module_exit(extcon_class_exit);
1484
1485MODULE_AUTHOR("Chanwoo Choi <[email protected]>");
1486MODULE_AUTHOR("MyungJoo Ham <[email protected]>");
1487MODULE_DESCRIPTION("External Connector (extcon) framework");
1488MODULE_LICENSE("GPL v2");