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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 * External connector (extcon) class driver
5 *
6 * Copyright (C) 2015 Samsung Electronics
7 * Author: Chanwoo Choi <cw00.choi@samsung.com>
8 *
9 * Copyright (C) 2012 Samsung Electronics
10 * Author: Donggeun Kim <dg77.kim@samsung.com>
11 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
12 *
13 * based on android/drivers/switch/switch_class.c
14 * Copyright (C) 2008 Google, Inc.
15 * Author: Mike Lockwood <lockwood@android.com>
16 *
17 * This software is licensed under the terms of the GNU General Public
18 * License version 2, as published by the Free Software Foundation, and
19 * may be copied, distributed, and modified under those terms.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 */
26
27#include <linux/module.h>
28#include <linux/types.h>
29#include <linux/init.h>
30#include <linux/device.h>
31#include <linux/fs.h>
32#include <linux/err.h>
33#include <linux/extcon.h>
34#include <linux/of.h>
35#include <linux/slab.h>
36#include <linux/sysfs.h>
37
38#define SUPPORTED_CABLE_MAX 32
39#define CABLE_NAME_MAX 30
40
41struct __extcon_info {
42 unsigned int type;
43 unsigned int id;
44 const char *name;
45
46} extcon_info[] = {
47 [EXTCON_NONE] = {
48 .type = EXTCON_TYPE_MISC,
49 .id = EXTCON_NONE,
50 .name = "NONE",
51 },
52
53 /* USB external connector */
54 [EXTCON_USB] = {
55 .type = EXTCON_TYPE_USB,
56 .id = EXTCON_USB,
57 .name = "USB",
58 },
59 [EXTCON_USB_HOST] = {
60 .type = EXTCON_TYPE_USB,
61 .id = EXTCON_USB_HOST,
62 .name = "USB_HOST",
63 },
64
65 /* Charging external connector */
66 [EXTCON_CHG_USB_SDP] = {
67 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
68 .id = EXTCON_CHG_USB_SDP,
69 .name = "SDP",
70 },
71 [EXTCON_CHG_USB_DCP] = {
72 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
73 .id = EXTCON_CHG_USB_DCP,
74 .name = "DCP",
75 },
76 [EXTCON_CHG_USB_CDP] = {
77 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
78 .id = EXTCON_CHG_USB_CDP,
79 .name = "CDP",
80 },
81 [EXTCON_CHG_USB_ACA] = {
82 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
83 .id = EXTCON_CHG_USB_ACA,
84 .name = "ACA",
85 },
86 [EXTCON_CHG_USB_FAST] = {
87 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
88 .id = EXTCON_CHG_USB_FAST,
89 .name = "FAST-CHARGER",
90 },
91 [EXTCON_CHG_USB_SLOW] = {
92 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
93 .id = EXTCON_CHG_USB_SLOW,
94 .name = "SLOW-CHARGER",
95 },
96 [EXTCON_CHG_WPT] = {
97 .type = EXTCON_TYPE_CHG,
98 .id = EXTCON_CHG_WPT,
99 .name = "WPT",
100 },
101
102 /* Jack external connector */
103 [EXTCON_JACK_MICROPHONE] = {
104 .type = EXTCON_TYPE_JACK,
105 .id = EXTCON_JACK_MICROPHONE,
106 .name = "MICROPHONE",
107 },
108 [EXTCON_JACK_HEADPHONE] = {
109 .type = EXTCON_TYPE_JACK,
110 .id = EXTCON_JACK_HEADPHONE,
111 .name = "HEADPHONE",
112 },
113 [EXTCON_JACK_LINE_IN] = {
114 .type = EXTCON_TYPE_JACK,
115 .id = EXTCON_JACK_LINE_IN,
116 .name = "LINE-IN",
117 },
118 [EXTCON_JACK_LINE_OUT] = {
119 .type = EXTCON_TYPE_JACK,
120 .id = EXTCON_JACK_LINE_OUT,
121 .name = "LINE-OUT",
122 },
123 [EXTCON_JACK_VIDEO_IN] = {
124 .type = EXTCON_TYPE_JACK,
125 .id = EXTCON_JACK_VIDEO_IN,
126 .name = "VIDEO-IN",
127 },
128 [EXTCON_JACK_VIDEO_OUT] = {
129 .type = EXTCON_TYPE_JACK,
130 .id = EXTCON_JACK_VIDEO_OUT,
131 .name = "VIDEO-OUT",
132 },
133 [EXTCON_JACK_SPDIF_IN] = {
134 .type = EXTCON_TYPE_JACK,
135 .id = EXTCON_JACK_SPDIF_IN,
136 .name = "SPDIF-IN",
137 },
138 [EXTCON_JACK_SPDIF_OUT] = {
139 .type = EXTCON_TYPE_JACK,
140 .id = EXTCON_JACK_SPDIF_OUT,
141 .name = "SPDIF-OUT",
142 },
143
144 /* Display external connector */
145 [EXTCON_DISP_HDMI] = {
146 .type = EXTCON_TYPE_DISP,
147 .id = EXTCON_DISP_HDMI,
148 .name = "HDMI",
149 },
150 [EXTCON_DISP_MHL] = {
151 .type = EXTCON_TYPE_DISP,
152 .id = EXTCON_DISP_MHL,
153 .name = "MHL",
154 },
155 [EXTCON_DISP_DVI] = {
156 .type = EXTCON_TYPE_DISP,
157 .id = EXTCON_DISP_DVI,
158 .name = "DVI",
159 },
160 [EXTCON_DISP_VGA] = {
161 .type = EXTCON_TYPE_DISP,
162 .id = EXTCON_DISP_VGA,
163 .name = "VGA",
164 },
165 [EXTCON_DISP_DP] = {
166 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
167 .id = EXTCON_DISP_DP,
168 .name = "DP",
169 },
170 [EXTCON_DISP_HMD] = {
171 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
172 .id = EXTCON_DISP_HMD,
173 .name = "HMD",
174 },
175
176 /* Miscellaneous external connector */
177 [EXTCON_DOCK] = {
178 .type = EXTCON_TYPE_MISC,
179 .id = EXTCON_DOCK,
180 .name = "DOCK",
181 },
182 [EXTCON_JIG] = {
183 .type = EXTCON_TYPE_MISC,
184 .id = EXTCON_JIG,
185 .name = "JIG",
186 },
187 [EXTCON_MECHANICAL] = {
188 .type = EXTCON_TYPE_MISC,
189 .id = EXTCON_MECHANICAL,
190 .name = "MECHANICAL",
191 },
192
193 { /* sentinel */ }
194};
195
196/**
197 * struct extcon_cable - An internal data for each cable of extcon device.
198 * @edev: The extcon device
199 * @cable_index: Index of this cable in the edev
200 * @attr_g: Attribute group for the cable
201 * @attr_name: "name" sysfs entry
202 * @attr_state: "state" sysfs entry
203 * @attrs: Array pointing to attr_name and attr_state for attr_g
204 */
205struct extcon_cable {
206 struct extcon_dev *edev;
207 int cable_index;
208
209 struct attribute_group attr_g;
210 struct device_attribute attr_name;
211 struct device_attribute attr_state;
212
213 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
214
215 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
216 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
217 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
218 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
219
220 unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
221 unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
222 unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
223 unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
224};
225
226static struct class *extcon_class;
227#if defined(CONFIG_ANDROID)
228static struct class_compat *switch_class;
229#endif /* CONFIG_ANDROID */
230
231static LIST_HEAD(extcon_dev_list);
232static DEFINE_MUTEX(extcon_dev_list_lock);
233
234/**
235 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
236 * condition.
237 * @edev: the extcon device
238 * @new_state: new cable attach status for @edev
239 *
240 * Returns 0 if nothing violates. Returns the index + 1 for the first
241 * violated condition.
242 */
243static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
244{
245 int i = 0;
246
247 if (!edev->mutually_exclusive)
248 return 0;
249
250 for (i = 0; edev->mutually_exclusive[i]; i++) {
251 int weight;
252 u32 correspondants = new_state & edev->mutually_exclusive[i];
253
254 /* calculate the total number of bits set */
255 weight = hweight32(correspondants);
256 if (weight > 1)
257 return i + 1;
258 }
259
260 return 0;
261}
262
263static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
264{
265 int i;
266
267 /* Find the the index of extcon cable in edev->supported_cable */
268 for (i = 0; i < edev->max_supported; i++) {
269 if (edev->supported_cable[i] == id)
270 return i;
271 }
272
273 return -EINVAL;
274}
275
276static int get_extcon_type(unsigned int prop)
277{
278 switch (prop) {
279 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
280 return EXTCON_TYPE_USB;
281 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
282 return EXTCON_TYPE_CHG;
283 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
284 return EXTCON_TYPE_JACK;
285 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
286 return EXTCON_TYPE_DISP;
287 default:
288 return -EINVAL;
289 }
290}
291
292static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
293{
294 return !!(edev->state & BIT(index));
295}
296
297static bool is_extcon_changed(struct extcon_dev *edev, int index,
298 bool new_state)
299{
300 int state = !!(edev->state & BIT(index));
301 return (state != new_state);
302}
303
304static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
305{
306 int type;
307
308 /* Check whether the property is supported or not. */
309 type = get_extcon_type(prop);
310 if (type < 0)
311 return false;
312
313 /* Check whether a specific extcon id supports the property or not. */
314 return !!(extcon_info[id].type & type);
315}
316
317static int is_extcon_property_capability(struct extcon_dev *edev,
318 unsigned int id, int index,unsigned int prop)
319{
320 struct extcon_cable *cable;
321 int type, ret;
322
323 /* Check whether the property is supported or not. */
324 type = get_extcon_type(prop);
325 if (type < 0)
326 return type;
327
328 cable = &edev->cables[index];
329
330 switch (type) {
331 case EXTCON_TYPE_USB:
332 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
333 break;
334 case EXTCON_TYPE_CHG:
335 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
336 break;
337 case EXTCON_TYPE_JACK:
338 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
339 break;
340 case EXTCON_TYPE_DISP:
341 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
342 break;
343 default:
344 ret = -EINVAL;
345 }
346
347 return ret;
348}
349
350static void init_property(struct extcon_dev *edev, unsigned int id, int index)
351{
352 unsigned int type = extcon_info[id].type;
353 struct extcon_cable *cable = &edev->cables[index];
354
355 if (EXTCON_TYPE_USB & type)
356 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
357 if (EXTCON_TYPE_CHG & type)
358 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
359 if (EXTCON_TYPE_JACK & type)
360 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
361 if (EXTCON_TYPE_DISP & type)
362 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
363}
364
365static ssize_t state_show(struct device *dev, struct device_attribute *attr,
366 char *buf)
367{
368 int i, count = 0;
369 struct extcon_dev *edev = dev_get_drvdata(dev);
370
371 if (edev->max_supported == 0)
372 return sprintf(buf, "%u\n", edev->state);
373
374 for (i = 0; i < edev->max_supported; i++) {
375 count += sprintf(buf + count, "%s=%d\n",
376 extcon_info[edev->supported_cable[i]].name,
377 !!(edev->state & (1 << i)));
378 }
379
380 return count;
381}
382static DEVICE_ATTR_RO(state);
383
384static ssize_t name_show(struct device *dev, struct device_attribute *attr,
385 char *buf)
386{
387 struct extcon_dev *edev = dev_get_drvdata(dev);
388
389 return sprintf(buf, "%s\n", edev->name);
390}
391static DEVICE_ATTR_RO(name);
392
393static ssize_t cable_name_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395{
396 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
397 attr_name);
398 int i = cable->cable_index;
399
400 return sprintf(buf, "%s\n",
401 extcon_info[cable->edev->supported_cable[i]].name);
402}
403
404static ssize_t cable_state_show(struct device *dev,
405 struct device_attribute *attr, char *buf)
406{
407 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
408 attr_state);
409
410 int i = cable->cable_index;
411
412 return sprintf(buf, "%d\n",
413 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
414}
415
416/**
417 * extcon_sync() - Synchronize the states for both the attached/detached
418 * @edev: the extcon device that has the cable.
419 *
420 * This function send a notification to synchronize the all states of a
421 * specific external connector
422 */
423int extcon_sync(struct extcon_dev *edev, unsigned int id)
424{
425 char name_buf[120];
426 char state_buf[120];
427 char *prop_buf;
428 char *envp[3];
429 int env_offset = 0;
430 int length;
431 int index;
432 int state;
433 unsigned long flags;
434
435 if (!edev)
436 return -EINVAL;
437
438 index = find_cable_index_by_id(edev, id);
439 if (index < 0)
440 return index;
441
442 spin_lock_irqsave(&edev->lock, flags);
443
444 state = !!(edev->state & BIT(index));
445 raw_notifier_call_chain(&edev->nh[index], state, edev);
446
447 /* This could be in interrupt handler */
448 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
449 if (!prop_buf) {
450 /* Unlock early before uevent */
451 spin_unlock_irqrestore(&edev->lock, flags);
452
453 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
454 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
455
456 return -ENOMEM;
457 }
458
459 length = name_show(&edev->dev, NULL, prop_buf);
460 if (length > 0) {
461 if (prop_buf[length - 1] == '\n')
462 prop_buf[length - 1] = 0;
463 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
464 envp[env_offset++] = name_buf;
465 }
466
467 length = state_show(&edev->dev, NULL, prop_buf);
468 if (length > 0) {
469 if (prop_buf[length - 1] == '\n')
470 prop_buf[length - 1] = 0;
471 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
472 envp[env_offset++] = state_buf;
473 }
474 envp[env_offset] = NULL;
475
476 /* Unlock early before uevent */
477 spin_unlock_irqrestore(&edev->lock, flags);
478 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
479 free_page((unsigned long)prop_buf);
480
481 return 0;
482}
483EXPORT_SYMBOL_GPL(extcon_sync);
484
485/**
486 * extcon_get_state() - Get the state of a external connector.
487 * @edev: the extcon device that has the cable.
488 * @id: the unique id of each external connector in extcon enumeration.
489 */
490int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
491{
492 int index, state;
493 unsigned long flags;
494
495 if (!edev)
496 return -EINVAL;
497
498 index = find_cable_index_by_id(edev, id);
499 if (index < 0)
500 return index;
501
502 spin_lock_irqsave(&edev->lock, flags);
503 state = is_extcon_attached(edev, index);
504 spin_unlock_irqrestore(&edev->lock, flags);
505
506 return state;
507}
508EXPORT_SYMBOL_GPL(extcon_get_state);
509
510/**
511 * extcon_set_state() - Set the state of a external connector.
512 * without a notification.
513 * @edev: the extcon device that has the cable.
514 * @id: the unique id of each external connector
515 * in extcon enumeration.
516 * @state: the new cable status. The default semantics is
517 * true: attached / false: detached.
518 *
519 * This function only set the state of a external connector without
520 * a notification. To synchronize the data of a external connector,
521 * use extcon_set_state_sync() and extcon_sync().
522 */
523int extcon_set_state(struct extcon_dev *edev, unsigned int id,
524 bool cable_state)
525{
526 unsigned long flags;
527 int index, ret = 0;
528
529 if (!edev)
530 return -EINVAL;
531
532 index = find_cable_index_by_id(edev, id);
533 if (index < 0)
534 return index;
535
536 spin_lock_irqsave(&edev->lock, flags);
537
538 /* Check whether the external connector's state is changed. */
539 if (!is_extcon_changed(edev, index, cable_state))
540 goto out;
541
542 if (check_mutually_exclusive(edev,
543 (edev->state & ~BIT(index)) | (cable_state & BIT(index)))) {
544 ret = -EPERM;
545 goto out;
546 }
547
548 /*
549 * Initialize the value of extcon property before setting
550 * the detached state for an external connector.
551 */
552 if (!cable_state)
553 init_property(edev, id, index);
554
555 /* Update the state for a external connector. */
556 if (cable_state)
557 edev->state |= BIT(index);
558 else
559 edev->state &= ~(BIT(index));
560out:
561 spin_unlock_irqrestore(&edev->lock, flags);
562
563 return ret;
564}
565EXPORT_SYMBOL_GPL(extcon_set_state);
566
567/**
568 * extcon_set_state_sync() - Set the state of a external connector
569 * with a notification.
570 * @edev: the extcon device that has the cable.
571 * @id: the unique id of each external connector
572 * in extcon enumeration.
573 * @state: the new cable status. The default semantics is
574 * true: attached / false: detached.
575 *
576 * This function set the state of external connector and synchronize the data
577 * by usning a notification.
578 */
579int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
580 bool cable_state)
581{
582 int ret, index;
583 unsigned long flags;
584
585 index = find_cable_index_by_id(edev, id);
586 if (index < 0)
587 return index;
588
589 /* Check whether the external connector's state is changed. */
590 spin_lock_irqsave(&edev->lock, flags);
591 ret = is_extcon_changed(edev, index, cable_state);
592 spin_unlock_irqrestore(&edev->lock, flags);
593 if (!ret)
594 return 0;
595
596 ret = extcon_set_state(edev, id, cable_state);
597 if (ret < 0)
598 return ret;
599
600 return extcon_sync(edev, id);
601}
602EXPORT_SYMBOL_GPL(extcon_set_state_sync);
603
604/**
605 * extcon_get_property() - Get the property value of a specific cable.
606 * @edev: the extcon device that has the cable.
607 * @id: the unique id of each external connector
608 * in extcon enumeration.
609 * @prop: the property id among enum extcon_property.
610 * @prop_val: the pointer which store the value of property.
611 *
612 * When getting the property value of external connector, the external connector
613 * should be attached. If detached state, function just return 0 without
614 * property value. Also, the each property should be included in the list of
615 * supported properties according to the type of external connectors.
616 *
617 * Returns 0 if success or error number if fail
618 */
619int extcon_get_property(struct extcon_dev *edev, unsigned int id,
620 unsigned int prop,
621 union extcon_property_value *prop_val)
622{
623 struct extcon_cable *cable;
624 unsigned long flags;
625 int index, ret = 0;
626
627 *prop_val = (union extcon_property_value)(0);
628
629 if (!edev)
630 return -EINVAL;
631
632 /* Check whether the property is supported or not */
633 if (!is_extcon_property_supported(id, prop))
634 return -EINVAL;
635
636 /* Find the cable index of external connector by using id */
637 index = find_cable_index_by_id(edev, id);
638 if (index < 0)
639 return index;
640
641 spin_lock_irqsave(&edev->lock, flags);
642
643 /* Check whether the property is available or not. */
644 if (!is_extcon_property_capability(edev, id, index, prop)) {
645 spin_unlock_irqrestore(&edev->lock, flags);
646 return -EPERM;
647 }
648
649 /*
650 * Check whether the external connector is attached.
651 * If external connector is detached, the user can not
652 * get the property value.
653 */
654 if (!is_extcon_attached(edev, index)) {
655 spin_unlock_irqrestore(&edev->lock, flags);
656 return 0;
657 }
658
659 cable = &edev->cables[index];
660
661 /* Get the property value according to extcon type */
662 switch (prop) {
663 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
664 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
665 break;
666 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
667 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
668 break;
669 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
670 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
671 break;
672 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
673 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
674 break;
675 default:
676 ret = -EINVAL;
677 break;
678 }
679
680 spin_unlock_irqrestore(&edev->lock, flags);
681
682 return ret;
683}
684EXPORT_SYMBOL_GPL(extcon_get_property);
685
686/**
687 * extcon_set_property() - Set the property value of a specific cable.
688 * @edev: the extcon device that has the cable.
689 * @id: the unique id of each external connector
690 * in extcon enumeration.
691 * @prop: the property id among enum extcon_property.
692 * @prop_val: the pointer including the new value of property.
693 *
694 * The each property should be included in the list of supported properties
695 * according to the type of external connectors.
696 *
697 * Returns 0 if success or error number if fail
698 */
699int extcon_set_property(struct extcon_dev *edev, unsigned int id,
700 unsigned int prop,
701 union extcon_property_value prop_val)
702{
703 struct extcon_cable *cable;
704 unsigned long flags;
705 int index, ret = 0;
706
707 if (!edev)
708 return -EINVAL;
709
710 /* Check whether the property is supported or not */
711 if (!is_extcon_property_supported(id, prop))
712 return -EINVAL;
713
714 /* Find the cable index of external connector by using id */
715 index = find_cable_index_by_id(edev, id);
716 if (index < 0)
717 return index;
718
719 spin_lock_irqsave(&edev->lock, flags);
720
721 /* Check whether the property is available or not. */
722 if (!is_extcon_property_capability(edev, id, index, prop)) {
723 spin_unlock_irqrestore(&edev->lock, flags);
724 return -EPERM;
725 }
726
727 cable = &edev->cables[index];
728
729 /* Set the property value according to extcon type */
730 switch (prop) {
731 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
732 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
733 break;
734 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
735 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
736 break;
737 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
738 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
739 break;
740 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
741 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
742 break;
743 default:
744 ret = -EINVAL;
745 break;
746 }
747
748 spin_unlock_irqrestore(&edev->lock, flags);
749
750 return ret;
751}
752EXPORT_SYMBOL_GPL(extcon_set_property);
753
754/**
755 * extcon_set_property_sync() - Set the property value of a specific cable
756 with a notification.
757 * @prop_val: the pointer including the new value of property.
758 *
759 * When setting the property value of external connector, the external connector
760 * should be attached. The each property should be included in the list of
761 * supported properties according to the type of external connectors.
762 *
763 * Returns 0 if success or error number if fail
764 */
765int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
766 unsigned int prop,
767 union extcon_property_value prop_val)
768{
769 int ret;
770
771 ret = extcon_set_property(edev, id, prop, prop_val);
772 if (ret < 0)
773 return ret;
774
775 return extcon_sync(edev, id);
776}
777EXPORT_SYMBOL_GPL(extcon_set_property_sync);
778
779/**
780 * extcon_get_property_capability() - Get the capability of property
781 * of an external connector.
782 * @edev: the extcon device that has the cable.
783 * @id: the unique id of each external connector
784 * in extcon enumeration.
785 * @prop: the property id among enum 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 a property
812 * of an external connector.
813 * @edev: the extcon device that has the cable.
814 * @id: the unique id of each external connector
815 * in extcon enumeration.
816 * @prop: the property id among enum extcon_property.
817 *
818 * This function set the capability of a property for an external connector
819 * to mark the bit in capability bitmap which mean the available state of
820 * a property.
821 *
822 * Returns 0 if success or error number if fail
823 */
824int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
825 unsigned int prop)
826{
827 struct extcon_cable *cable;
828 int index, type, ret = 0;
829
830 if (!edev)
831 return -EINVAL;
832
833 /* Check whether the property is supported or not. */
834 if (!is_extcon_property_supported(id, prop))
835 return -EINVAL;
836
837 /* Find the cable index of external connector by using id. */
838 index = find_cable_index_by_id(edev, id);
839 if (index < 0)
840 return index;
841
842 type = get_extcon_type(prop);
843 if (type < 0)
844 return type;
845
846 cable = &edev->cables[index];
847
848 switch (type) {
849 case EXTCON_TYPE_USB:
850 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
851 break;
852 case EXTCON_TYPE_CHG:
853 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
854 break;
855 case EXTCON_TYPE_JACK:
856 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
857 break;
858 case EXTCON_TYPE_DISP:
859 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
860 break;
861 default:
862 ret = -EINVAL;
863 }
864
865 return ret;
866}
867EXPORT_SYMBOL_GPL(extcon_set_property_capability);
868
869/**
870 * extcon_get_extcon_dev() - Get the extcon device instance from the name
871 * @extcon_name: The extcon name provided with extcon_dev_register()
872 */
873struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
874{
875 struct extcon_dev *sd;
876
877 if (!extcon_name)
878 return ERR_PTR(-EINVAL);
879
880 mutex_lock(&extcon_dev_list_lock);
881 list_for_each_entry(sd, &extcon_dev_list, entry) {
882 if (!strcmp(sd->name, extcon_name))
883 goto out;
884 }
885 sd = NULL;
886out:
887 mutex_unlock(&extcon_dev_list_lock);
888 return sd;
889}
890EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
891
892/**
893 * extcon_register_notifier() - Register a notifiee to get notified by
894 * any attach status changes from the extcon.
895 * @edev: the extcon device that has the external connecotr.
896 * @id: the unique id of each external connector in extcon enumeration.
897 * @nb: a notifier block to be registered.
898 *
899 * Note that the second parameter given to the callback of nb (val) is
900 * "old_state", not the current state. The current state can be retrieved
901 * by looking at the third pameter (edev pointer)'s state value.
902 */
903int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
904 struct notifier_block *nb)
905{
906 unsigned long flags;
907 int ret, idx = -EINVAL;
908
909 if (!nb)
910 return -EINVAL;
911
912 if (edev) {
913 idx = find_cable_index_by_id(edev, id);
914 if (idx < 0)
915 return idx;
916
917 spin_lock_irqsave(&edev->lock, flags);
918 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
919 spin_unlock_irqrestore(&edev->lock, flags);
920 } else {
921 struct extcon_dev *extd;
922
923 mutex_lock(&extcon_dev_list_lock);
924 list_for_each_entry(extd, &extcon_dev_list, entry) {
925 idx = find_cable_index_by_id(extd, id);
926 if (idx >= 0)
927 break;
928 }
929 mutex_unlock(&extcon_dev_list_lock);
930
931 if (idx >= 0) {
932 edev = extd;
933 return extcon_register_notifier(extd, id, nb);
934 } else {
935 ret = -ENODEV;
936 }
937 }
938
939 return ret;
940}
941EXPORT_SYMBOL_GPL(extcon_register_notifier);
942
943/**
944 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
945 * @edev: the extcon device that has the external connecotr.
946 * @id: the unique id of each external connector in extcon enumeration.
947 * @nb: a notifier block to be registered.
948 */
949int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
950 struct notifier_block *nb)
951{
952 unsigned long flags;
953 int ret, idx;
954
955 if (!edev || !nb)
956 return -EINVAL;
957
958 idx = find_cable_index_by_id(edev, id);
959 if (idx < 0)
960 return idx;
961
962 spin_lock_irqsave(&edev->lock, flags);
963 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
964 spin_unlock_irqrestore(&edev->lock, flags);
965
966 return ret;
967}
968EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
969
970static struct attribute *extcon_attrs[] = {
971 &dev_attr_state.attr,
972 &dev_attr_name.attr,
973 NULL,
974};
975ATTRIBUTE_GROUPS(extcon);
976
977static int create_extcon_class(void)
978{
979 if (!extcon_class) {
980 extcon_class = class_create(THIS_MODULE, "extcon");
981 if (IS_ERR(extcon_class))
982 return PTR_ERR(extcon_class);
983 extcon_class->dev_groups = extcon_groups;
984
985#if defined(CONFIG_ANDROID)
986 switch_class = class_compat_register("switch");
987 if (WARN(!switch_class, "cannot allocate"))
988 return -ENOMEM;
989#endif /* CONFIG_ANDROID */
990 }
991
992 return 0;
993}
994
995static void extcon_dev_release(struct device *dev)
996{
997}
998
999static const char *muex_name = "mutually_exclusive";
1000static void dummy_sysfs_dev_release(struct device *dev)
1001{
1002}
1003
1004/*
1005 * extcon_dev_allocate() - Allocate the memory of extcon device.
1006 * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
1007 * If supported_cable is NULL, cable name related APIs
1008 * are disabled.
1009 *
1010 * This function allocates the memory for extcon device without allocating
1011 * memory in each extcon provider driver and initialize default setting for
1012 * extcon device.
1013 *
1014 * Return the pointer of extcon device if success or ERR_PTR(err) if fail
1015 */
1016struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1017{
1018 struct extcon_dev *edev;
1019
1020 if (!supported_cable)
1021 return ERR_PTR(-EINVAL);
1022
1023 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1024 if (!edev)
1025 return ERR_PTR(-ENOMEM);
1026
1027 edev->max_supported = 0;
1028 edev->supported_cable = supported_cable;
1029
1030 return edev;
1031}
1032
1033/*
1034 * extcon_dev_free() - Free the memory of extcon device.
1035 * @edev: the extcon device to free
1036 */
1037void extcon_dev_free(struct extcon_dev *edev)
1038{
1039 kfree(edev);
1040}
1041EXPORT_SYMBOL_GPL(extcon_dev_free);
1042
1043/**
1044 * extcon_dev_register() - Register a new extcon device
1045 * @edev : the new extcon device (should be allocated before calling)
1046 *
1047 * Among the members of edev struct, please set the "user initializing data"
1048 * in any case and set the "optional callbacks" if required. However, please
1049 * do not set the values of "internal data", which are initialized by
1050 * this function.
1051 */
1052int extcon_dev_register(struct extcon_dev *edev)
1053{
1054 int ret, index = 0;
1055 static atomic_t edev_no = ATOMIC_INIT(-1);
1056
1057 if (!extcon_class) {
1058 ret = create_extcon_class();
1059 if (ret < 0)
1060 return ret;
1061 }
1062
1063 if (!edev || !edev->supported_cable)
1064 return -EINVAL;
1065
1066 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1067
1068 edev->max_supported = index;
1069 if (index > SUPPORTED_CABLE_MAX) {
1070 dev_err(&edev->dev,
1071 "exceed the maximum number of supported cables\n");
1072 return -EINVAL;
1073 }
1074
1075 edev->dev.class = extcon_class;
1076 edev->dev.release = extcon_dev_release;
1077
1078 edev->name = dev_name(edev->dev.parent);
1079 if (IS_ERR_OR_NULL(edev->name)) {
1080 dev_err(&edev->dev,
1081 "extcon device name is null\n");
1082 return -EINVAL;
1083 }
1084 dev_set_name(&edev->dev, "extcon%lu",
1085 (unsigned long)atomic_inc_return(&edev_no));
1086
1087 if (edev->max_supported) {
1088 char buf[10];
1089 char *str;
1090 struct extcon_cable *cable;
1091
1092 edev->cables = kzalloc(sizeof(struct extcon_cable) *
1093 edev->max_supported, GFP_KERNEL);
1094 if (!edev->cables) {
1095 ret = -ENOMEM;
1096 goto err_sysfs_alloc;
1097 }
1098 for (index = 0; index < edev->max_supported; index++) {
1099 cable = &edev->cables[index];
1100
1101 snprintf(buf, 10, "cable.%d", index);
1102 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
1103 GFP_KERNEL);
1104 if (!str) {
1105 for (index--; index >= 0; index--) {
1106 cable = &edev->cables[index];
1107 kfree(cable->attr_g.name);
1108 }
1109 ret = -ENOMEM;
1110
1111 goto err_alloc_cables;
1112 }
1113 strcpy(str, buf);
1114
1115 cable->edev = edev;
1116 cable->cable_index = index;
1117 cable->attrs[0] = &cable->attr_name.attr;
1118 cable->attrs[1] = &cable->attr_state.attr;
1119 cable->attrs[2] = NULL;
1120 cable->attr_g.name = str;
1121 cable->attr_g.attrs = cable->attrs;
1122
1123 sysfs_attr_init(&cable->attr_name.attr);
1124 cable->attr_name.attr.name = "name";
1125 cable->attr_name.attr.mode = 0444;
1126 cable->attr_name.show = cable_name_show;
1127
1128 sysfs_attr_init(&cable->attr_state.attr);
1129 cable->attr_state.attr.name = "state";
1130 cable->attr_state.attr.mode = 0444;
1131 cable->attr_state.show = cable_state_show;
1132 }
1133 }
1134
1135 if (edev->max_supported && edev->mutually_exclusive) {
1136 char buf[80];
1137 char *name;
1138
1139 /* Count the size of mutually_exclusive array */
1140 for (index = 0; edev->mutually_exclusive[index]; index++)
1141 ;
1142
1143 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
1144 (index + 1), GFP_KERNEL);
1145 if (!edev->attrs_muex) {
1146 ret = -ENOMEM;
1147 goto err_muex;
1148 }
1149
1150 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
1151 index, GFP_KERNEL);
1152 if (!edev->d_attrs_muex) {
1153 ret = -ENOMEM;
1154 kfree(edev->attrs_muex);
1155 goto err_muex;
1156 }
1157
1158 for (index = 0; edev->mutually_exclusive[index]; index++) {
1159 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
1160 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
1161 GFP_KERNEL);
1162 if (!name) {
1163 for (index--; index >= 0; index--) {
1164 kfree(edev->d_attrs_muex[index].attr.
1165 name);
1166 }
1167 kfree(edev->d_attrs_muex);
1168 kfree(edev->attrs_muex);
1169 ret = -ENOMEM;
1170 goto err_muex;
1171 }
1172 strcpy(name, buf);
1173 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1174 edev->d_attrs_muex[index].attr.name = name;
1175 edev->d_attrs_muex[index].attr.mode = 0000;
1176 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1177 .attr;
1178 }
1179 edev->attr_g_muex.name = muex_name;
1180 edev->attr_g_muex.attrs = edev->attrs_muex;
1181
1182 }
1183
1184 if (edev->max_supported) {
1185 edev->extcon_dev_type.groups =
1186 kzalloc(sizeof(struct attribute_group *) *
1187 (edev->max_supported + 2), GFP_KERNEL);
1188 if (!edev->extcon_dev_type.groups) {
1189 ret = -ENOMEM;
1190 goto err_alloc_groups;
1191 }
1192
1193 edev->extcon_dev_type.name = dev_name(&edev->dev);
1194 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1195
1196 for (index = 0; index < edev->max_supported; index++)
1197 edev->extcon_dev_type.groups[index] =
1198 &edev->cables[index].attr_g;
1199 if (edev->mutually_exclusive)
1200 edev->extcon_dev_type.groups[index] =
1201 &edev->attr_g_muex;
1202
1203 edev->dev.type = &edev->extcon_dev_type;
1204 }
1205
1206 ret = device_register(&edev->dev);
1207 if (ret) {
1208 put_device(&edev->dev);
1209 goto err_dev;
1210 }
1211#if defined(CONFIG_ANDROID)
1212 if (switch_class)
1213 ret = class_compat_create_link(switch_class, &edev->dev, NULL);
1214#endif /* CONFIG_ANDROID */
1215
1216 spin_lock_init(&edev->lock);
1217
1218 edev->nh = devm_kzalloc(&edev->dev,
1219 sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL);
1220 if (!edev->nh) {
1221 ret = -ENOMEM;
1222 goto err_dev;
1223 }
1224
1225 for (index = 0; index < edev->max_supported; index++)
1226 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1227
1228 dev_set_drvdata(&edev->dev, edev);
1229 edev->state = 0;
1230
1231 mutex_lock(&extcon_dev_list_lock);
1232 list_add(&edev->entry, &extcon_dev_list);
1233 mutex_unlock(&extcon_dev_list_lock);
1234
1235 return 0;
1236
1237err_dev:
1238 if (edev->max_supported)
1239 kfree(edev->extcon_dev_type.groups);
1240err_alloc_groups:
1241 if (edev->max_supported && edev->mutually_exclusive) {
1242 for (index = 0; edev->mutually_exclusive[index]; index++)
1243 kfree(edev->d_attrs_muex[index].attr.name);
1244 kfree(edev->d_attrs_muex);
1245 kfree(edev->attrs_muex);
1246 }
1247err_muex:
1248 for (index = 0; index < edev->max_supported; index++)
1249 kfree(edev->cables[index].attr_g.name);
1250err_alloc_cables:
1251 if (edev->max_supported)
1252 kfree(edev->cables);
1253err_sysfs_alloc:
1254 return ret;
1255}
1256EXPORT_SYMBOL_GPL(extcon_dev_register);
1257
1258/**
1259 * extcon_dev_unregister() - Unregister the extcon device.
1260 * @edev: the extcon device instance to be unregistered.
1261 *
1262 * Note that this does not call kfree(edev) because edev was not allocated
1263 * by this class.
1264 */
1265void extcon_dev_unregister(struct extcon_dev *edev)
1266{
1267 int index;
1268
1269 if (!edev)
1270 return;
1271
1272 mutex_lock(&extcon_dev_list_lock);
1273 list_del(&edev->entry);
1274 mutex_unlock(&extcon_dev_list_lock);
1275
1276 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1277 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1278 dev_name(&edev->dev));
1279 return;
1280 }
1281
1282 device_unregister(&edev->dev);
1283
1284 if (edev->mutually_exclusive && edev->max_supported) {
1285 for (index = 0; edev->mutually_exclusive[index];
1286 index++)
1287 kfree(edev->d_attrs_muex[index].attr.name);
1288 kfree(edev->d_attrs_muex);
1289 kfree(edev->attrs_muex);
1290 }
1291
1292 for (index = 0; index < edev->max_supported; index++)
1293 kfree(edev->cables[index].attr_g.name);
1294
1295 if (edev->max_supported) {
1296 kfree(edev->extcon_dev_type.groups);
1297 kfree(edev->cables);
1298 }
1299
1300#if defined(CONFIG_ANDROID)
1301 if (switch_class)
1302 class_compat_remove_link(switch_class, &edev->dev, NULL);
1303#endif
1304 put_device(&edev->dev);
1305}
1306EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1307
1308#ifdef CONFIG_OF
1309/*
1310 * extcon_get_edev_by_phandle - Get the extcon device from devicetree
1311 * @dev - instance to the given device
1312 * @index - index into list of extcon_dev
1313 *
1314 * return the instance of extcon device
1315 */
1316struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1317{
1318 struct device_node *node;
1319 struct extcon_dev *edev;
1320
1321 if (!dev)
1322 return ERR_PTR(-EINVAL);
1323
1324 if (!dev->of_node) {
1325 dev_dbg(dev, "device does not have a device node entry\n");
1326 return ERR_PTR(-EINVAL);
1327 }
1328
1329 node = of_parse_phandle(dev->of_node, "extcon", index);
1330 if (!node) {
1331 dev_dbg(dev, "failed to get phandle in %s node\n",
1332 dev->of_node->full_name);
1333 return ERR_PTR(-ENODEV);
1334 }
1335
1336 mutex_lock(&extcon_dev_list_lock);
1337 list_for_each_entry(edev, &extcon_dev_list, entry) {
1338 if (edev->dev.parent && edev->dev.parent->of_node == node) {
1339 mutex_unlock(&extcon_dev_list_lock);
1340 of_node_put(node);
1341 return edev;
1342 }
1343 }
1344 mutex_unlock(&extcon_dev_list_lock);
1345 of_node_put(node);
1346
1347 return ERR_PTR(-EPROBE_DEFER);
1348}
1349#else
1350struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1351{
1352 return ERR_PTR(-ENOSYS);
1353}
1354#endif /* CONFIG_OF */
1355EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1356
1357/**
1358 * extcon_get_edev_name() - Get the name of the extcon device.
1359 * @edev: the extcon device
1360 */
1361const char *extcon_get_edev_name(struct extcon_dev *edev)
1362{
1363 return !edev ? NULL : edev->name;
1364}
1365
1366static int __init extcon_class_init(void)
1367{
1368 return create_extcon_class();
1369}
1370module_init(extcon_class_init);
1371
1372static void __exit extcon_class_exit(void)
1373{
1374#if defined(CONFIG_ANDROID)
1375 class_compat_unregister(switch_class);
1376#endif
1377 class_destroy(extcon_class);
1378}
1379module_exit(extcon_class_exit);
1380
1381MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1382MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
1383MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
1384MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1385MODULE_DESCRIPTION("External connector (extcon) class driver");
1386MODULE_LICENSE("GPL");