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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 <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/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(sizeof(*edev), GFP_KERNEL);
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 = kcalloc(edev->max_supported, sizeof(*edev->cables),
1102 GFP_KERNEL);
1103 if (!edev->cables)
1104 return -ENOMEM;
1105
1106 for (index = 0; index < edev->max_supported; index++) {
1107 cable = &edev->cables[index];
1108
1109 str = kasprintf(GFP_KERNEL, "cable.%d", index);
1110 if (!str) {
1111 for (index--; index >= 0; index--) {
1112 cable = &edev->cables[index];
1113 kfree(cable->attr_g.name);
1114 }
1115
1116 kfree(edev->cables);
1117 return -ENOMEM;
1118 }
1119
1120 cable->edev = edev;
1121 cable->cable_index = index;
1122 cable->attrs[0] = &cable->attr_name.attr;
1123 cable->attrs[1] = &cable->attr_state.attr;
1124 cable->attrs[2] = NULL;
1125 cable->attr_g.name = str;
1126 cable->attr_g.attrs = cable->attrs;
1127
1128 sysfs_attr_init(&cable->attr_name.attr);
1129 cable->attr_name.attr.name = "name";
1130 cable->attr_name.attr.mode = 0444;
1131 cable->attr_name.show = cable_name_show;
1132
1133 sysfs_attr_init(&cable->attr_state.attr);
1134 cable->attr_state.attr.name = "state";
1135 cable->attr_state.attr.mode = 0444;
1136 cable->attr_state.show = cable_state_show;
1137 }
1138
1139 return 0;
1140}
1141
1142/**
1143 * extcon_alloc_muex() - alloc the mutual exclusive for extcon device
1144 * @edev: extcon device
1145 *
1146 * Returns 0 if success or error number if fail.
1147 */
1148static int extcon_alloc_muex(struct extcon_dev *edev)
1149{
1150 char *name;
1151 int index;
1152
1153 if (!edev)
1154 return -EINVAL;
1155
1156 if (!(edev->max_supported && edev->mutually_exclusive))
1157 return 0;
1158
1159 /* Count the size of mutually_exclusive array */
1160 for (index = 0; edev->mutually_exclusive[index]; index++)
1161 ;
1162
1163 edev->attrs_muex = kcalloc(index + 1, sizeof(*edev->attrs_muex),
1164 GFP_KERNEL);
1165 if (!edev->attrs_muex)
1166 return -ENOMEM;
1167
1168 edev->d_attrs_muex = kcalloc(index, sizeof(*edev->d_attrs_muex),
1169 GFP_KERNEL);
1170 if (!edev->d_attrs_muex) {
1171 kfree(edev->attrs_muex);
1172 return -ENOMEM;
1173 }
1174
1175 for (index = 0; edev->mutually_exclusive[index]; index++) {
1176 name = kasprintf(GFP_KERNEL, "0x%x",
1177 edev->mutually_exclusive[index]);
1178 if (!name) {
1179 for (index--; index >= 0; index--)
1180 kfree(edev->d_attrs_muex[index].attr.name);
1181
1182 kfree(edev->d_attrs_muex);
1183 kfree(edev->attrs_muex);
1184 return -ENOMEM;
1185 }
1186 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1187 edev->d_attrs_muex[index].attr.name = name;
1188 edev->d_attrs_muex[index].attr.mode = 0000;
1189 edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr;
1190 }
1191 edev->attr_g_muex.name = muex_name;
1192 edev->attr_g_muex.attrs = edev->attrs_muex;
1193
1194 return 0;
1195}
1196
1197/**
1198 * extcon_alloc_groups() - alloc the groups for extcon device
1199 * @edev: extcon device
1200 *
1201 * Returns 0 if success or error number if fail.
1202 */
1203static int extcon_alloc_groups(struct extcon_dev *edev)
1204{
1205 int index;
1206
1207 if (!edev)
1208 return -EINVAL;
1209
1210 if (!edev->max_supported)
1211 return 0;
1212
1213 edev->extcon_dev_type.groups = kcalloc(edev->max_supported + 2,
1214 sizeof(*edev->extcon_dev_type.groups),
1215 GFP_KERNEL);
1216 if (!edev->extcon_dev_type.groups)
1217 return -ENOMEM;
1218
1219 edev->extcon_dev_type.name = dev_name(&edev->dev);
1220 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1221
1222 for (index = 0; index < edev->max_supported; index++)
1223 edev->extcon_dev_type.groups[index] = &edev->cables[index].attr_g;
1224
1225 if (edev->mutually_exclusive)
1226 edev->extcon_dev_type.groups[index] = &edev->attr_g_muex;
1227
1228 edev->dev.type = &edev->extcon_dev_type;
1229
1230 return 0;
1231}
1232
1233/**
1234 * extcon_dev_register() - Register an new extcon device
1235 * @edev: the extcon device to be registered
1236 *
1237 * Among the members of edev struct, please set the "user initializing data"
1238 * do not set the values of "internal data", which are initialized by
1239 * this function.
1240 *
1241 * Note that before calling this funciton, have to allocate the memory
1242 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1243 * dev should include the supported_cable information.
1244 *
1245 * Returns 0 if success or error number if fail.
1246 */
1247int extcon_dev_register(struct extcon_dev *edev)
1248{
1249 int ret, index;
1250
1251 ret = create_extcon_class();
1252 if (ret < 0)
1253 return ret;
1254
1255 if (!edev || !edev->supported_cable)
1256 return -EINVAL;
1257
1258 for (index = 0; edev->supported_cable[index] != EXTCON_NONE; index++);
1259
1260 edev->max_supported = index;
1261 if (index > SUPPORTED_CABLE_MAX) {
1262 dev_err(&edev->dev,
1263 "exceed the maximum number of supported cables\n");
1264 return -EINVAL;
1265 }
1266
1267 edev->dev.class = extcon_class;
1268 edev->dev.release = extcon_dev_release;
1269
1270 edev->name = dev_name(edev->dev.parent);
1271 if (IS_ERR_OR_NULL(edev->name)) {
1272 dev_err(&edev->dev,
1273 "extcon device name is null\n");
1274 return -EINVAL;
1275 }
1276
1277 ret = ida_alloc(&extcon_dev_ids, GFP_KERNEL);
1278 if (ret < 0)
1279 return ret;
1280
1281 edev->id = ret;
1282
1283 ret = extcon_alloc_cables(edev);
1284 if (ret < 0)
1285 goto err_alloc_cables;
1286
1287 ret = extcon_alloc_muex(edev);
1288 if (ret < 0)
1289 goto err_alloc_muex;
1290
1291 ret = extcon_alloc_groups(edev);
1292 if (ret < 0)
1293 goto err_alloc_groups;
1294
1295 spin_lock_init(&edev->lock);
1296 if (edev->max_supported) {
1297 edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh),
1298 GFP_KERNEL);
1299 if (!edev->nh) {
1300 ret = -ENOMEM;
1301 goto err_alloc_nh;
1302 }
1303 }
1304
1305 for (index = 0; index < edev->max_supported; index++)
1306 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1307
1308 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1309
1310 dev_set_drvdata(&edev->dev, edev);
1311 dev_set_name(&edev->dev, "extcon%d", edev->id);
1312 edev->state = 0;
1313
1314 ret = device_register(&edev->dev);
1315 if (ret) {
1316 put_device(&edev->dev);
1317 goto err_dev;
1318 }
1319
1320 mutex_lock(&extcon_dev_list_lock);
1321 list_add(&edev->entry, &extcon_dev_list);
1322 mutex_unlock(&extcon_dev_list_lock);
1323
1324 return 0;
1325
1326err_dev:
1327 if (edev->max_supported)
1328 kfree(edev->nh);
1329err_alloc_nh:
1330 if (edev->max_supported)
1331 kfree(edev->extcon_dev_type.groups);
1332err_alloc_groups:
1333 if (edev->max_supported && edev->mutually_exclusive) {
1334 for (index = 0; edev->mutually_exclusive[index]; index++)
1335 kfree(edev->d_attrs_muex[index].attr.name);
1336 kfree(edev->d_attrs_muex);
1337 kfree(edev->attrs_muex);
1338 }
1339err_alloc_muex:
1340 for (index = 0; index < edev->max_supported; index++)
1341 kfree(edev->cables[index].attr_g.name);
1342 if (edev->max_supported)
1343 kfree(edev->cables);
1344err_alloc_cables:
1345 ida_free(&extcon_dev_ids, edev->id);
1346
1347 return ret;
1348}
1349EXPORT_SYMBOL_GPL(extcon_dev_register);
1350
1351/**
1352 * extcon_dev_unregister() - Unregister the extcon device.
1353 * @edev: the extcon device to be unregistered.
1354 *
1355 * Note that this does not call kfree(edev) because edev was not allocated
1356 * by this class.
1357 */
1358void extcon_dev_unregister(struct extcon_dev *edev)
1359{
1360 int index;
1361
1362 if (!edev)
1363 return;
1364
1365 mutex_lock(&extcon_dev_list_lock);
1366 list_del(&edev->entry);
1367 mutex_unlock(&extcon_dev_list_lock);
1368
1369 if (!get_device(&edev->dev)) {
1370 dev_err(&edev->dev, "Failed to unregister extcon_dev\n");
1371 return;
1372 }
1373
1374 ida_free(&extcon_dev_ids, edev->id);
1375
1376 device_unregister(&edev->dev);
1377
1378 if (edev->mutually_exclusive && edev->max_supported) {
1379 for (index = 0; edev->mutually_exclusive[index];
1380 index++)
1381 kfree(edev->d_attrs_muex[index].attr.name);
1382 kfree(edev->d_attrs_muex);
1383 kfree(edev->attrs_muex);
1384 }
1385
1386 for (index = 0; index < edev->max_supported; index++)
1387 kfree(edev->cables[index].attr_g.name);
1388
1389 if (edev->max_supported) {
1390 kfree(edev->extcon_dev_type.groups);
1391 kfree(edev->cables);
1392 kfree(edev->nh);
1393 }
1394
1395 put_device(&edev->dev);
1396}
1397EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1398
1399#ifdef CONFIG_OF
1400
1401/*
1402 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1403 * @node : OF node identifying edev
1404 *
1405 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1406 */
1407struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1408{
1409 struct extcon_dev *edev;
1410
1411 mutex_lock(&extcon_dev_list_lock);
1412 list_for_each_entry(edev, &extcon_dev_list, entry)
1413 if (edev->dev.parent && device_match_of_node(edev->dev.parent, node))
1414 goto out;
1415 edev = ERR_PTR(-EPROBE_DEFER);
1416out:
1417 mutex_unlock(&extcon_dev_list_lock);
1418
1419 return edev;
1420}
1421
1422/*
1423 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1424 * @dev : the instance to the given device
1425 * @index : the index into list of extcon_dev
1426 *
1427 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1428 */
1429struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1430{
1431 struct device_node *node, *np = dev_of_node(dev);
1432 struct extcon_dev *edev;
1433
1434 if (!np) {
1435 dev_dbg(dev, "device does not have a device node entry\n");
1436 return ERR_PTR(-EINVAL);
1437 }
1438
1439 node = of_parse_phandle(np, "extcon", index);
1440 if (!node) {
1441 dev_dbg(dev, "failed to get phandle in %pOF node\n", np);
1442 return ERR_PTR(-ENODEV);
1443 }
1444
1445 edev = extcon_find_edev_by_node(node);
1446 of_node_put(node);
1447
1448 return edev;
1449}
1450
1451#else
1452
1453struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1454{
1455 return ERR_PTR(-ENOSYS);
1456}
1457
1458struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1459{
1460 return ERR_PTR(-ENOSYS);
1461}
1462
1463#endif /* CONFIG_OF */
1464
1465EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1466EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1467
1468/**
1469 * extcon_get_edev_name() - Get the name of the extcon device.
1470 * @edev: the extcon device
1471 */
1472const char *extcon_get_edev_name(struct extcon_dev *edev)
1473{
1474 return !edev ? NULL : edev->name;
1475}
1476EXPORT_SYMBOL_GPL(extcon_get_edev_name);
1477
1478static int __init extcon_class_init(void)
1479{
1480 return create_extcon_class();
1481}
1482module_init(extcon_class_init);
1483
1484static void __exit extcon_class_exit(void)
1485{
1486 class_destroy(extcon_class);
1487}
1488module_exit(extcon_class_exit);
1489
1490MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1491MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1492MODULE_DESCRIPTION("External Connector (extcon) framework");
1493MODULE_LICENSE("GPL v2");
1/*
2 * drivers/extcon/extcon.c - External Connector (extcon) framework.
3 *
4 * Copyright (C) 2015 Samsung Electronics
5 * Author: Chanwoo Choi <cw00.choi@samsung.com>
6 *
7 * Copyright (C) 2012 Samsung Electronics
8 * Author: Donggeun Kim <dg77.kim@samsung.com>
9 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
10 *
11 * based on android/drivers/switch/switch_class.c
12 * Copyright (C) 2008 Google, Inc.
13 * Author: Mike Lockwood <lockwood@android.com>
14 *
15 * This software is licensed under the terms of the GNU General Public
16 * License version 2, as published by the Free Software Foundation, and
17 * may be copied, distributed, and modified under those terms.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 */
24
25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/init.h>
28#include <linux/device.h>
29#include <linux/fs.h>
30#include <linux/err.h>
31#include <linux/of.h>
32#include <linux/slab.h>
33#include <linux/sysfs.h>
34
35#include "extcon.h"
36
37#define SUPPORTED_CABLE_MAX 32
38
39static const struct __extcon_info {
40 unsigned int type;
41 unsigned int id;
42 const char *name;
43
44} extcon_info[] = {
45 [EXTCON_NONE] = {
46 .type = EXTCON_TYPE_MISC,
47 .id = EXTCON_NONE,
48 .name = "NONE",
49 },
50
51 /* USB external connector */
52 [EXTCON_USB] = {
53 .type = EXTCON_TYPE_USB,
54 .id = EXTCON_USB,
55 .name = "USB",
56 },
57 [EXTCON_USB_HOST] = {
58 .type = EXTCON_TYPE_USB,
59 .id = EXTCON_USB_HOST,
60 .name = "USB-HOST",
61 },
62
63 /* Charging external connector */
64 [EXTCON_CHG_USB_SDP] = {
65 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
66 .id = EXTCON_CHG_USB_SDP,
67 .name = "SDP",
68 },
69 [EXTCON_CHG_USB_DCP] = {
70 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
71 .id = EXTCON_CHG_USB_DCP,
72 .name = "DCP",
73 },
74 [EXTCON_CHG_USB_CDP] = {
75 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
76 .id = EXTCON_CHG_USB_CDP,
77 .name = "CDP",
78 },
79 [EXTCON_CHG_USB_ACA] = {
80 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
81 .id = EXTCON_CHG_USB_ACA,
82 .name = "ACA",
83 },
84 [EXTCON_CHG_USB_FAST] = {
85 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
86 .id = EXTCON_CHG_USB_FAST,
87 .name = "FAST-CHARGER",
88 },
89 [EXTCON_CHG_USB_SLOW] = {
90 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
91 .id = EXTCON_CHG_USB_SLOW,
92 .name = "SLOW-CHARGER",
93 },
94 [EXTCON_CHG_WPT] = {
95 .type = EXTCON_TYPE_CHG,
96 .id = EXTCON_CHG_WPT,
97 .name = "WPT",
98 },
99 [EXTCON_CHG_USB_PD] = {
100 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
101 .id = EXTCON_CHG_USB_PD,
102 .name = "PD",
103 },
104
105 /* Jack external connector */
106 [EXTCON_JACK_MICROPHONE] = {
107 .type = EXTCON_TYPE_JACK,
108 .id = EXTCON_JACK_MICROPHONE,
109 .name = "MICROPHONE",
110 },
111 [EXTCON_JACK_HEADPHONE] = {
112 .type = EXTCON_TYPE_JACK,
113 .id = EXTCON_JACK_HEADPHONE,
114 .name = "HEADPHONE",
115 },
116 [EXTCON_JACK_LINE_IN] = {
117 .type = EXTCON_TYPE_JACK,
118 .id = EXTCON_JACK_LINE_IN,
119 .name = "LINE-IN",
120 },
121 [EXTCON_JACK_LINE_OUT] = {
122 .type = EXTCON_TYPE_JACK,
123 .id = EXTCON_JACK_LINE_OUT,
124 .name = "LINE-OUT",
125 },
126 [EXTCON_JACK_VIDEO_IN] = {
127 .type = EXTCON_TYPE_JACK,
128 .id = EXTCON_JACK_VIDEO_IN,
129 .name = "VIDEO-IN",
130 },
131 [EXTCON_JACK_VIDEO_OUT] = {
132 .type = EXTCON_TYPE_JACK,
133 .id = EXTCON_JACK_VIDEO_OUT,
134 .name = "VIDEO-OUT",
135 },
136 [EXTCON_JACK_SPDIF_IN] = {
137 .type = EXTCON_TYPE_JACK,
138 .id = EXTCON_JACK_SPDIF_IN,
139 .name = "SPDIF-IN",
140 },
141 [EXTCON_JACK_SPDIF_OUT] = {
142 .type = EXTCON_TYPE_JACK,
143 .id = EXTCON_JACK_SPDIF_OUT,
144 .name = "SPDIF-OUT",
145 },
146
147 /* Display external connector */
148 [EXTCON_DISP_HDMI] = {
149 .type = EXTCON_TYPE_DISP,
150 .id = EXTCON_DISP_HDMI,
151 .name = "HDMI",
152 },
153 [EXTCON_DISP_MHL] = {
154 .type = EXTCON_TYPE_DISP,
155 .id = EXTCON_DISP_MHL,
156 .name = "MHL",
157 },
158 [EXTCON_DISP_DVI] = {
159 .type = EXTCON_TYPE_DISP,
160 .id = EXTCON_DISP_DVI,
161 .name = "DVI",
162 },
163 [EXTCON_DISP_VGA] = {
164 .type = EXTCON_TYPE_DISP,
165 .id = EXTCON_DISP_VGA,
166 .name = "VGA",
167 },
168 [EXTCON_DISP_DP] = {
169 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
170 .id = EXTCON_DISP_DP,
171 .name = "DP",
172 },
173 [EXTCON_DISP_HMD] = {
174 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
175 .id = EXTCON_DISP_HMD,
176 .name = "HMD",
177 },
178
179 /* Miscellaneous external connector */
180 [EXTCON_DOCK] = {
181 .type = EXTCON_TYPE_MISC,
182 .id = EXTCON_DOCK,
183 .name = "DOCK",
184 },
185 [EXTCON_JIG] = {
186 .type = EXTCON_TYPE_MISC,
187 .id = EXTCON_JIG,
188 .name = "JIG",
189 },
190 [EXTCON_MECHANICAL] = {
191 .type = EXTCON_TYPE_MISC,
192 .id = EXTCON_MECHANICAL,
193 .name = "MECHANICAL",
194 },
195
196 { /* sentinel */ }
197};
198
199/**
200 * struct extcon_cable - An internal data for an external connector.
201 * @edev: the extcon device
202 * @cable_index: the index of this cable in the edev
203 * @attr_g: the attribute group for the cable
204 * @attr_name: "name" sysfs entry
205 * @attr_state: "state" sysfs entry
206 * @attrs: the array pointing to attr_name and attr_state for attr_g
207 */
208struct extcon_cable {
209 struct extcon_dev *edev;
210 int cable_index;
211
212 struct attribute_group attr_g;
213 struct device_attribute attr_name;
214 struct device_attribute attr_state;
215
216 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
217
218 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
219 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
220 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
221 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
222
223 unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
224 unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
225 unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
226 unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
227};
228
229static struct class *extcon_class;
230
231static LIST_HEAD(extcon_dev_list);
232static DEFINE_MUTEX(extcon_dev_list_lock);
233
234static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
235{
236 int i = 0;
237
238 if (!edev->mutually_exclusive)
239 return 0;
240
241 for (i = 0; edev->mutually_exclusive[i]; i++) {
242 int weight;
243 u32 correspondants = new_state & edev->mutually_exclusive[i];
244
245 /* calculate the total number of bits set */
246 weight = hweight32(correspondants);
247 if (weight > 1)
248 return i + 1;
249 }
250
251 return 0;
252}
253
254static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
255{
256 int i;
257
258 /* Find the the index of extcon cable in edev->supported_cable */
259 for (i = 0; i < edev->max_supported; i++) {
260 if (edev->supported_cable[i] == id)
261 return i;
262 }
263
264 return -EINVAL;
265}
266
267static int get_extcon_type(unsigned int prop)
268{
269 switch (prop) {
270 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
271 return EXTCON_TYPE_USB;
272 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
273 return EXTCON_TYPE_CHG;
274 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
275 return EXTCON_TYPE_JACK;
276 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
277 return EXTCON_TYPE_DISP;
278 default:
279 return -EINVAL;
280 }
281}
282
283static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
284{
285 return !!(edev->state & BIT(index));
286}
287
288static bool is_extcon_changed(struct extcon_dev *edev, int index,
289 bool new_state)
290{
291 int state = !!(edev->state & BIT(index));
292 return (state != new_state);
293}
294
295static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
296{
297 int type;
298
299 /* Check whether the property is supported or not. */
300 type = get_extcon_type(prop);
301 if (type < 0)
302 return false;
303
304 /* Check whether a specific extcon id supports the property or not. */
305 return !!(extcon_info[id].type & type);
306}
307
308static int is_extcon_property_capability(struct extcon_dev *edev,
309 unsigned int id, int index,unsigned int prop)
310{
311 struct extcon_cable *cable;
312 int type, ret;
313
314 /* Check whether the property is supported or not. */
315 type = get_extcon_type(prop);
316 if (type < 0)
317 return type;
318
319 cable = &edev->cables[index];
320
321 switch (type) {
322 case EXTCON_TYPE_USB:
323 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
324 break;
325 case EXTCON_TYPE_CHG:
326 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
327 break;
328 case EXTCON_TYPE_JACK:
329 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
330 break;
331 case EXTCON_TYPE_DISP:
332 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
333 break;
334 default:
335 ret = -EINVAL;
336 }
337
338 return ret;
339}
340
341static void init_property(struct extcon_dev *edev, unsigned int id, int index)
342{
343 unsigned int type = extcon_info[id].type;
344 struct extcon_cable *cable = &edev->cables[index];
345
346 if (EXTCON_TYPE_USB & type)
347 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
348 if (EXTCON_TYPE_CHG & type)
349 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
350 if (EXTCON_TYPE_JACK & type)
351 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
352 if (EXTCON_TYPE_DISP & type)
353 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
354}
355
356static ssize_t state_show(struct device *dev, struct device_attribute *attr,
357 char *buf)
358{
359 int i, count = 0;
360 struct extcon_dev *edev = dev_get_drvdata(dev);
361
362 if (edev->max_supported == 0)
363 return sprintf(buf, "%u\n", edev->state);
364
365 for (i = 0; i < edev->max_supported; i++) {
366 count += sprintf(buf + count, "%s=%d\n",
367 extcon_info[edev->supported_cable[i]].name,
368 !!(edev->state & BIT(i)));
369 }
370
371 return count;
372}
373static DEVICE_ATTR_RO(state);
374
375static ssize_t name_show(struct device *dev, struct device_attribute *attr,
376 char *buf)
377{
378 struct extcon_dev *edev = dev_get_drvdata(dev);
379
380 return sprintf(buf, "%s\n", edev->name);
381}
382static DEVICE_ATTR_RO(name);
383
384static ssize_t cable_name_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
386{
387 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
388 attr_name);
389 int i = cable->cable_index;
390
391 return sprintf(buf, "%s\n",
392 extcon_info[cable->edev->supported_cable[i]].name);
393}
394
395static ssize_t cable_state_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
399 attr_state);
400
401 int i = cable->cable_index;
402
403 return sprintf(buf, "%d\n",
404 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
405}
406
407/**
408 * extcon_sync() - Synchronize the state for an external connector.
409 * @edev: the extcon device
410 *
411 * Note that this function send a notification in order to synchronize
412 * the state and property of an external connector.
413 *
414 * Returns 0 if success or error number if fail.
415 */
416int extcon_sync(struct extcon_dev *edev, unsigned int id)
417{
418 char name_buf[120];
419 char state_buf[120];
420 char *prop_buf;
421 char *envp[3];
422 int env_offset = 0;
423 int length;
424 int index;
425 int state;
426 unsigned long flags;
427
428 if (!edev)
429 return -EINVAL;
430
431 index = find_cable_index_by_id(edev, id);
432 if (index < 0)
433 return index;
434
435 spin_lock_irqsave(&edev->lock, flags);
436
437 state = !!(edev->state & BIT(index));
438
439 /*
440 * Call functions in a raw notifier chain for the specific one
441 * external connector.
442 */
443 raw_notifier_call_chain(&edev->nh[index], state, edev);
444
445 /*
446 * Call functions in a raw notifier chain for the all supported
447 * external connectors.
448 */
449 raw_notifier_call_chain(&edev->nh_all, state, edev);
450
451 /* This could be in interrupt handler */
452 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
453 if (!prop_buf) {
454 /* Unlock early before uevent */
455 spin_unlock_irqrestore(&edev->lock, flags);
456
457 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
458 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
459
460 return -ENOMEM;
461 }
462
463 length = name_show(&edev->dev, NULL, prop_buf);
464 if (length > 0) {
465 if (prop_buf[length - 1] == '\n')
466 prop_buf[length - 1] = 0;
467 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
468 envp[env_offset++] = name_buf;
469 }
470
471 length = state_show(&edev->dev, NULL, prop_buf);
472 if (length > 0) {
473 if (prop_buf[length - 1] == '\n')
474 prop_buf[length - 1] = 0;
475 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
476 envp[env_offset++] = state_buf;
477 }
478 envp[env_offset] = NULL;
479
480 /* Unlock early before uevent */
481 spin_unlock_irqrestore(&edev->lock, flags);
482 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
483 free_page((unsigned long)prop_buf);
484
485 return 0;
486}
487EXPORT_SYMBOL_GPL(extcon_sync);
488
489/**
490 * extcon_get_state() - Get the state of an external connector.
491 * @edev: the extcon device
492 * @id: the unique id indicating an external connector
493 *
494 * Returns 0 if success or error number if fail.
495 */
496int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
497{
498 int index, state;
499 unsigned long flags;
500
501 if (!edev)
502 return -EINVAL;
503
504 index = find_cable_index_by_id(edev, id);
505 if (index < 0)
506 return index;
507
508 spin_lock_irqsave(&edev->lock, flags);
509 state = is_extcon_attached(edev, index);
510 spin_unlock_irqrestore(&edev->lock, flags);
511
512 return state;
513}
514EXPORT_SYMBOL_GPL(extcon_get_state);
515
516/**
517 * extcon_set_state() - Set the state of an external connector.
518 * @edev: the extcon device
519 * @id: the unique id indicating an external connector
520 * @state: the new state of an external connector.
521 * the default semantics is true: attached / false: detached.
522 *
523 * Note that this function set the state of an external connector without
524 * a notification. To synchronize the state of an external connector,
525 * have to use extcon_set_state_sync() and extcon_sync().
526 *
527 * Returns 0 if success or error number if fail.
528 */
529int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
530{
531 unsigned long flags;
532 int index, ret = 0;
533
534 if (!edev)
535 return -EINVAL;
536
537 index = find_cable_index_by_id(edev, id);
538 if (index < 0)
539 return index;
540
541 spin_lock_irqsave(&edev->lock, flags);
542
543 /* Check whether the external connector's state is changed. */
544 if (!is_extcon_changed(edev, index, state))
545 goto out;
546
547 if (check_mutually_exclusive(edev,
548 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
549 ret = -EPERM;
550 goto out;
551 }
552
553 /*
554 * Initialize the value of extcon property before setting
555 * the detached state for an external connector.
556 */
557 if (!state)
558 init_property(edev, id, index);
559
560 /* Update the state for an external connector. */
561 if (state)
562 edev->state |= BIT(index);
563 else
564 edev->state &= ~(BIT(index));
565out:
566 spin_unlock_irqrestore(&edev->lock, flags);
567
568 return ret;
569}
570EXPORT_SYMBOL_GPL(extcon_set_state);
571
572/**
573 * extcon_set_state_sync() - Set the state of an external connector with sync.
574 * @edev: the extcon device
575 * @id: the unique id indicating an external connector
576 * @state: the new state of external connector.
577 * the default semantics is true: attached / false: detached.
578 *
579 * Note that this function set the state of external connector
580 * and synchronize the state by sending a notification.
581 *
582 * Returns 0 if success or error number if fail.
583 */
584int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
585{
586 int ret, index;
587 unsigned long flags;
588
589 index = find_cable_index_by_id(edev, id);
590 if (index < 0)
591 return index;
592
593 /* Check whether the external connector's state is changed. */
594 spin_lock_irqsave(&edev->lock, flags);
595 ret = is_extcon_changed(edev, index, state);
596 spin_unlock_irqrestore(&edev->lock, flags);
597 if (!ret)
598 return 0;
599
600 ret = extcon_set_state(edev, id, state);
601 if (ret < 0)
602 return ret;
603
604 return extcon_sync(edev, id);
605}
606EXPORT_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 */
622int 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}
687EXPORT_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 */
701int 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}
754EXPORT_SYMBOL_GPL(extcon_set_property);
755
756/**
757 * extcon_set_property_sync() - Set property of an external connector with sync.
758 * @prop_val: the pointer including the new value of extcon property
759 *
760 * Note that when setting the property value of external connector,
761 * the external connector should be attached. The each property should
762 * be included in the list of supported properties according to extcon type.
763 *
764 * Returns 0 if success or error number if fail.
765 */
766int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
767 unsigned int prop,
768 union extcon_property_value prop_val)
769{
770 int ret;
771
772 ret = extcon_set_property(edev, id, prop, prop_val);
773 if (ret < 0)
774 return ret;
775
776 return extcon_sync(edev, id);
777}
778EXPORT_SYMBOL_GPL(extcon_set_property_sync);
779
780/**
781 * extcon_get_property_capability() - Get the capability of the property
782 * for an external connector.
783 * @edev: the extcon device
784 * @id: the unique id indicating an external connector
785 * @prop: the property id indicating an extcon property
786 *
787 * Returns 1 if the property is available or 0 if not available.
788 */
789int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
790 unsigned int prop)
791{
792 int index;
793
794 if (!edev)
795 return -EINVAL;
796
797 /* Check whether the property is supported or not */
798 if (!is_extcon_property_supported(id, prop))
799 return -EINVAL;
800
801 /* Find the cable index of external connector by using id */
802 index = find_cable_index_by_id(edev, id);
803 if (index < 0)
804 return index;
805
806 return is_extcon_property_capability(edev, id, index, prop);
807}
808EXPORT_SYMBOL_GPL(extcon_get_property_capability);
809
810/**
811 * extcon_set_property_capability() - Set the capability of the property
812 * for an external connector.
813 * @edev: the extcon device
814 * @id: the unique id indicating an external connector
815 * @prop: the property id indicating an extcon property
816 *
817 * Note that this function set the capability of the property
818 * for an external connector in order to mark the bit in capability
819 * bitmap which mean the available state of the property.
820 *
821 * Returns 0 if success or error number if fail.
822 */
823int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
824 unsigned int prop)
825{
826 struct extcon_cable *cable;
827 int index, type, ret = 0;
828
829 if (!edev)
830 return -EINVAL;
831
832 /* Check whether the property is supported or not. */
833 if (!is_extcon_property_supported(id, prop))
834 return -EINVAL;
835
836 /* Find the cable index of external connector by using id. */
837 index = find_cable_index_by_id(edev, id);
838 if (index < 0)
839 return index;
840
841 type = get_extcon_type(prop);
842 if (type < 0)
843 return type;
844
845 cable = &edev->cables[index];
846
847 switch (type) {
848 case EXTCON_TYPE_USB:
849 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
850 break;
851 case EXTCON_TYPE_CHG:
852 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
853 break;
854 case EXTCON_TYPE_JACK:
855 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
856 break;
857 case EXTCON_TYPE_DISP:
858 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
859 break;
860 default:
861 ret = -EINVAL;
862 }
863
864 return ret;
865}
866EXPORT_SYMBOL_GPL(extcon_set_property_capability);
867
868/**
869 * extcon_get_extcon_dev() - Get the extcon device instance from the name.
870 * @extcon_name: the extcon name provided with extcon_dev_register()
871 *
872 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
873 */
874struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
875{
876 struct extcon_dev *sd;
877
878 if (!extcon_name)
879 return ERR_PTR(-EINVAL);
880
881 mutex_lock(&extcon_dev_list_lock);
882 list_for_each_entry(sd, &extcon_dev_list, entry) {
883 if (!strcmp(sd->name, extcon_name))
884 goto out;
885 }
886 sd = NULL;
887out:
888 mutex_unlock(&extcon_dev_list_lock);
889 return sd;
890}
891EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
892
893/**
894 * extcon_register_notifier() - Register a notifier block to get notified by
895 * any state changes from the extcon.
896 * @edev: the extcon device
897 * @id: the unique id indicating an external connector
898 * @nb: a notifier block to be registered
899 *
900 * Note that the second parameter given to the callback of nb (val) is
901 * the current state of an external connector and the third pameter
902 * is the pointer of extcon device.
903 *
904 * Returns 0 if success or error number if fail.
905 */
906int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
907 struct notifier_block *nb)
908{
909 unsigned long flags;
910 int ret, idx = -EINVAL;
911
912 if (!edev || !nb)
913 return -EINVAL;
914
915 idx = find_cable_index_by_id(edev, id);
916 if (idx < 0)
917 return idx;
918
919 spin_lock_irqsave(&edev->lock, flags);
920 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
921 spin_unlock_irqrestore(&edev->lock, flags);
922
923 return ret;
924}
925EXPORT_SYMBOL_GPL(extcon_register_notifier);
926
927/**
928 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
929 * @edev: the extcon device
930 * @id: the unique id indicating an external connector
931 * @nb: a notifier block to be registered
932 *
933 * Returns 0 if success or error number if fail.
934 */
935int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
936 struct notifier_block *nb)
937{
938 unsigned long flags;
939 int ret, idx;
940
941 if (!edev || !nb)
942 return -EINVAL;
943
944 idx = find_cable_index_by_id(edev, id);
945 if (idx < 0)
946 return idx;
947
948 spin_lock_irqsave(&edev->lock, flags);
949 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
950 spin_unlock_irqrestore(&edev->lock, flags);
951
952 return ret;
953}
954EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
955
956/**
957 * extcon_register_notifier_all() - Register a notifier block for all connectors.
958 * @edev: the extcon device
959 * @nb: a notifier block to be registered
960 *
961 * Note that this function registers a notifier block in order to receive
962 * the state change of all supported external connectors from extcon device.
963 * And the second parameter given to the callback of nb (val) is
964 * the current state and the third pameter is the pointer of extcon device.
965 *
966 * Returns 0 if success or error number if fail.
967 */
968int extcon_register_notifier_all(struct extcon_dev *edev,
969 struct notifier_block *nb)
970{
971 unsigned long flags;
972 int ret;
973
974 if (!edev || !nb)
975 return -EINVAL;
976
977 spin_lock_irqsave(&edev->lock, flags);
978 ret = raw_notifier_chain_register(&edev->nh_all, nb);
979 spin_unlock_irqrestore(&edev->lock, flags);
980
981 return ret;
982}
983EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
984
985/**
986 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
987 * @edev: the extcon device
988 * @nb: a notifier block to be registered
989 *
990 * Returns 0 if success or error number if fail.
991 */
992int extcon_unregister_notifier_all(struct extcon_dev *edev,
993 struct notifier_block *nb)
994{
995 unsigned long flags;
996 int ret;
997
998 if (!edev || !nb)
999 return -EINVAL;
1000
1001 spin_lock_irqsave(&edev->lock, flags);
1002 ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
1003 spin_unlock_irqrestore(&edev->lock, flags);
1004
1005 return ret;
1006}
1007EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1008
1009static struct attribute *extcon_attrs[] = {
1010 &dev_attr_state.attr,
1011 &dev_attr_name.attr,
1012 NULL,
1013};
1014ATTRIBUTE_GROUPS(extcon);
1015
1016static int create_extcon_class(void)
1017{
1018 if (!extcon_class) {
1019 extcon_class = class_create(THIS_MODULE, "extcon");
1020 if (IS_ERR(extcon_class))
1021 return PTR_ERR(extcon_class);
1022 extcon_class->dev_groups = extcon_groups;
1023 }
1024
1025 return 0;
1026}
1027
1028static void extcon_dev_release(struct device *dev)
1029{
1030}
1031
1032static const char *muex_name = "mutually_exclusive";
1033static void dummy_sysfs_dev_release(struct device *dev)
1034{
1035}
1036
1037/*
1038 * extcon_dev_allocate() - Allocate the memory of extcon device.
1039 * @supported_cable: the array of the supported external connectors
1040 * ending with EXTCON_NONE.
1041 *
1042 * Note that this function allocates the memory for extcon device
1043 * and initialize default setting for the extcon device.
1044 *
1045 * Returns the pointer memory of allocated extcon_dev if success
1046 * or ERR_PTR(err) if fail.
1047 */
1048struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1049{
1050 struct extcon_dev *edev;
1051
1052 if (!supported_cable)
1053 return ERR_PTR(-EINVAL);
1054
1055 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1056 if (!edev)
1057 return ERR_PTR(-ENOMEM);
1058
1059 edev->max_supported = 0;
1060 edev->supported_cable = supported_cable;
1061
1062 return edev;
1063}
1064
1065/*
1066 * extcon_dev_free() - Free the memory of extcon device.
1067 * @edev: the extcon device
1068 */
1069void extcon_dev_free(struct extcon_dev *edev)
1070{
1071 kfree(edev);
1072}
1073EXPORT_SYMBOL_GPL(extcon_dev_free);
1074
1075/**
1076 * extcon_dev_register() - Register an new extcon device
1077 * @edev: the extcon device to be registered
1078 *
1079 * Among the members of edev struct, please set the "user initializing data"
1080 * do not set the values of "internal data", which are initialized by
1081 * this function.
1082 *
1083 * Note that before calling this funciton, have to allocate the memory
1084 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1085 * dev should include the supported_cable information.
1086 *
1087 * Returns 0 if success or error number if fail.
1088 */
1089int extcon_dev_register(struct extcon_dev *edev)
1090{
1091 int ret, index = 0;
1092 static atomic_t edev_no = ATOMIC_INIT(-1);
1093
1094 if (!extcon_class) {
1095 ret = create_extcon_class();
1096 if (ret < 0)
1097 return ret;
1098 }
1099
1100 if (!edev || !edev->supported_cable)
1101 return -EINVAL;
1102
1103 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1104
1105 edev->max_supported = index;
1106 if (index > SUPPORTED_CABLE_MAX) {
1107 dev_err(&edev->dev,
1108 "exceed the maximum number of supported cables\n");
1109 return -EINVAL;
1110 }
1111
1112 edev->dev.class = extcon_class;
1113 edev->dev.release = extcon_dev_release;
1114
1115 edev->name = dev_name(edev->dev.parent);
1116 if (IS_ERR_OR_NULL(edev->name)) {
1117 dev_err(&edev->dev,
1118 "extcon device name is null\n");
1119 return -EINVAL;
1120 }
1121 dev_set_name(&edev->dev, "extcon%lu",
1122 (unsigned long)atomic_inc_return(&edev_no));
1123
1124 if (edev->max_supported) {
1125 char buf[10];
1126 char *str;
1127 struct extcon_cable *cable;
1128
1129 edev->cables = kzalloc(sizeof(struct extcon_cable) *
1130 edev->max_supported, GFP_KERNEL);
1131 if (!edev->cables) {
1132 ret = -ENOMEM;
1133 goto err_sysfs_alloc;
1134 }
1135 for (index = 0; index < edev->max_supported; index++) {
1136 cable = &edev->cables[index];
1137
1138 snprintf(buf, 10, "cable.%d", index);
1139 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
1140 GFP_KERNEL);
1141 if (!str) {
1142 for (index--; index >= 0; index--) {
1143 cable = &edev->cables[index];
1144 kfree(cable->attr_g.name);
1145 }
1146 ret = -ENOMEM;
1147
1148 goto err_alloc_cables;
1149 }
1150 strcpy(str, buf);
1151
1152 cable->edev = edev;
1153 cable->cable_index = index;
1154 cable->attrs[0] = &cable->attr_name.attr;
1155 cable->attrs[1] = &cable->attr_state.attr;
1156 cable->attrs[2] = NULL;
1157 cable->attr_g.name = str;
1158 cable->attr_g.attrs = cable->attrs;
1159
1160 sysfs_attr_init(&cable->attr_name.attr);
1161 cable->attr_name.attr.name = "name";
1162 cable->attr_name.attr.mode = 0444;
1163 cable->attr_name.show = cable_name_show;
1164
1165 sysfs_attr_init(&cable->attr_state.attr);
1166 cable->attr_state.attr.name = "state";
1167 cable->attr_state.attr.mode = 0444;
1168 cable->attr_state.show = cable_state_show;
1169 }
1170 }
1171
1172 if (edev->max_supported && edev->mutually_exclusive) {
1173 char buf[80];
1174 char *name;
1175
1176 /* Count the size of mutually_exclusive array */
1177 for (index = 0; edev->mutually_exclusive[index]; index++)
1178 ;
1179
1180 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
1181 (index + 1), GFP_KERNEL);
1182 if (!edev->attrs_muex) {
1183 ret = -ENOMEM;
1184 goto err_muex;
1185 }
1186
1187 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
1188 index, GFP_KERNEL);
1189 if (!edev->d_attrs_muex) {
1190 ret = -ENOMEM;
1191 kfree(edev->attrs_muex);
1192 goto err_muex;
1193 }
1194
1195 for (index = 0; edev->mutually_exclusive[index]; index++) {
1196 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
1197 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
1198 GFP_KERNEL);
1199 if (!name) {
1200 for (index--; index >= 0; index--) {
1201 kfree(edev->d_attrs_muex[index].attr.
1202 name);
1203 }
1204 kfree(edev->d_attrs_muex);
1205 kfree(edev->attrs_muex);
1206 ret = -ENOMEM;
1207 goto err_muex;
1208 }
1209 strcpy(name, buf);
1210 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1211 edev->d_attrs_muex[index].attr.name = name;
1212 edev->d_attrs_muex[index].attr.mode = 0000;
1213 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1214 .attr;
1215 }
1216 edev->attr_g_muex.name = muex_name;
1217 edev->attr_g_muex.attrs = edev->attrs_muex;
1218
1219 }
1220
1221 if (edev->max_supported) {
1222 edev->extcon_dev_type.groups =
1223 kzalloc(sizeof(struct attribute_group *) *
1224 (edev->max_supported + 2), GFP_KERNEL);
1225 if (!edev->extcon_dev_type.groups) {
1226 ret = -ENOMEM;
1227 goto err_alloc_groups;
1228 }
1229
1230 edev->extcon_dev_type.name = dev_name(&edev->dev);
1231 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1232
1233 for (index = 0; index < edev->max_supported; index++)
1234 edev->extcon_dev_type.groups[index] =
1235 &edev->cables[index].attr_g;
1236 if (edev->mutually_exclusive)
1237 edev->extcon_dev_type.groups[index] =
1238 &edev->attr_g_muex;
1239
1240 edev->dev.type = &edev->extcon_dev_type;
1241 }
1242
1243 ret = device_register(&edev->dev);
1244 if (ret) {
1245 put_device(&edev->dev);
1246 goto err_dev;
1247 }
1248
1249 spin_lock_init(&edev->lock);
1250 edev->nh = devm_kcalloc(&edev->dev, edev->max_supported,
1251 sizeof(*edev->nh), GFP_KERNEL);
1252 if (!edev->nh) {
1253 ret = -ENOMEM;
1254 goto err_dev;
1255 }
1256
1257 for (index = 0; index < edev->max_supported; index++)
1258 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1259
1260 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1261
1262 dev_set_drvdata(&edev->dev, edev);
1263 edev->state = 0;
1264
1265 mutex_lock(&extcon_dev_list_lock);
1266 list_add(&edev->entry, &extcon_dev_list);
1267 mutex_unlock(&extcon_dev_list_lock);
1268
1269 return 0;
1270
1271err_dev:
1272 if (edev->max_supported)
1273 kfree(edev->extcon_dev_type.groups);
1274err_alloc_groups:
1275 if (edev->max_supported && edev->mutually_exclusive) {
1276 for (index = 0; edev->mutually_exclusive[index]; index++)
1277 kfree(edev->d_attrs_muex[index].attr.name);
1278 kfree(edev->d_attrs_muex);
1279 kfree(edev->attrs_muex);
1280 }
1281err_muex:
1282 for (index = 0; index < edev->max_supported; index++)
1283 kfree(edev->cables[index].attr_g.name);
1284err_alloc_cables:
1285 if (edev->max_supported)
1286 kfree(edev->cables);
1287err_sysfs_alloc:
1288 return ret;
1289}
1290EXPORT_SYMBOL_GPL(extcon_dev_register);
1291
1292/**
1293 * extcon_dev_unregister() - Unregister the extcon device.
1294 * @edev: the extcon device to be unregistered.
1295 *
1296 * Note that this does not call kfree(edev) because edev was not allocated
1297 * by this class.
1298 */
1299void extcon_dev_unregister(struct extcon_dev *edev)
1300{
1301 int index;
1302
1303 if (!edev)
1304 return;
1305
1306 mutex_lock(&extcon_dev_list_lock);
1307 list_del(&edev->entry);
1308 mutex_unlock(&extcon_dev_list_lock);
1309
1310 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1311 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1312 dev_name(&edev->dev));
1313 return;
1314 }
1315
1316 device_unregister(&edev->dev);
1317
1318 if (edev->mutually_exclusive && edev->max_supported) {
1319 for (index = 0; edev->mutually_exclusive[index];
1320 index++)
1321 kfree(edev->d_attrs_muex[index].attr.name);
1322 kfree(edev->d_attrs_muex);
1323 kfree(edev->attrs_muex);
1324 }
1325
1326 for (index = 0; index < edev->max_supported; index++)
1327 kfree(edev->cables[index].attr_g.name);
1328
1329 if (edev->max_supported) {
1330 kfree(edev->extcon_dev_type.groups);
1331 kfree(edev->cables);
1332 }
1333
1334 put_device(&edev->dev);
1335}
1336EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1337
1338#ifdef CONFIG_OF
1339
1340/*
1341 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1342 * @node : OF node identifying edev
1343 *
1344 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1345 */
1346struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1347{
1348 struct extcon_dev *edev;
1349
1350 mutex_lock(&extcon_dev_list_lock);
1351 list_for_each_entry(edev, &extcon_dev_list, entry)
1352 if (edev->dev.parent && edev->dev.parent->of_node == node)
1353 goto out;
1354 edev = ERR_PTR(-EPROBE_DEFER);
1355out:
1356 mutex_unlock(&extcon_dev_list_lock);
1357
1358 return edev;
1359}
1360
1361/*
1362 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1363 * @dev : the instance to the given device
1364 * @index : the index into list of extcon_dev
1365 *
1366 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1367 */
1368struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1369{
1370 struct device_node *node;
1371 struct extcon_dev *edev;
1372
1373 if (!dev)
1374 return ERR_PTR(-EINVAL);
1375
1376 if (!dev->of_node) {
1377 dev_dbg(dev, "device does not have a device node entry\n");
1378 return ERR_PTR(-EINVAL);
1379 }
1380
1381 node = of_parse_phandle(dev->of_node, "extcon", index);
1382 if (!node) {
1383 dev_dbg(dev, "failed to get phandle in %pOF node\n",
1384 dev->of_node);
1385 return ERR_PTR(-ENODEV);
1386 }
1387
1388 edev = extcon_find_edev_by_node(node);
1389 of_node_put(node);
1390
1391 return edev;
1392}
1393
1394#else
1395
1396struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1397{
1398 return ERR_PTR(-ENOSYS);
1399}
1400
1401struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1402{
1403 return ERR_PTR(-ENOSYS);
1404}
1405
1406#endif /* CONFIG_OF */
1407
1408EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1409EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1410
1411/**
1412 * extcon_get_edev_name() - Get the name of the extcon device.
1413 * @edev: the extcon device
1414 */
1415const char *extcon_get_edev_name(struct extcon_dev *edev)
1416{
1417 return !edev ? NULL : edev->name;
1418}
1419
1420static int __init extcon_class_init(void)
1421{
1422 return create_extcon_class();
1423}
1424module_init(extcon_class_init);
1425
1426static void __exit extcon_class_exit(void)
1427{
1428 class_destroy(extcon_class);
1429}
1430module_exit(extcon_class_exit);
1431
1432MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1433MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1434MODULE_DESCRIPTION("External Connector (extcon) framework");
1435MODULE_LICENSE("GPL v2");