1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * drivers/extcon/extcon.c - External Connector (extcon) framework.
4 *
5 * Copyright (C) 2015 Samsung Electronics
6 * Author: Chanwoo Choi <cw00.choi@samsung.com>
7 *
8 * Copyright (C) 2012 Samsung Electronics
9 * Author: Donggeun Kim <dg77.kim@samsung.com>
10 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
11 *
12 * based on android/drivers/switch/switch_class.c
13 * Copyright (C) 2008 Google, Inc.
14 * Author: Mike Lockwood <lockwood@android.com>
15 */
16
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/fs.h>
22 #include <linux/err.h>
23 #include <linux/of.h>
24 #include <linux/slab.h>
25 #include <linux/sysfs.h>
26
27 #include "extcon.h"
28
29 #define SUPPORTED_CABLE_MAX 32
30
31 static const struct __extcon_info {
32 unsigned int type;
33 unsigned int id;
34 const char *name;
35
36 } extcon_info[] = {
37 [EXTCON_NONE] = {
38 .type = EXTCON_TYPE_MISC,
39 .id = EXTCON_NONE,
40 .name = "NONE",
41 },
42
43 /* USB external connector */
44 [EXTCON_USB] = {
45 .type = EXTCON_TYPE_USB,
46 .id = EXTCON_USB,
47 .name = "USB",
48 },
49 [EXTCON_USB_HOST] = {
50 .type = EXTCON_TYPE_USB,
51 .id = EXTCON_USB_HOST,
52 .name = "USB-HOST",
53 },
54
55 /* Charging external connector */
56 [EXTCON_CHG_USB_SDP] = {
57 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
58 .id = EXTCON_CHG_USB_SDP,
59 .name = "SDP",
60 },
61 [EXTCON_CHG_USB_DCP] = {
62 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
63 .id = EXTCON_CHG_USB_DCP,
64 .name = "DCP",
65 },
66 [EXTCON_CHG_USB_CDP] = {
67 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
68 .id = EXTCON_CHG_USB_CDP,
69 .name = "CDP",
70 },
71 [EXTCON_CHG_USB_ACA] = {
72 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
73 .id = EXTCON_CHG_USB_ACA,
74 .name = "ACA",
75 },
76 [EXTCON_CHG_USB_FAST] = {
77 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
78 .id = EXTCON_CHG_USB_FAST,
79 .name = "FAST-CHARGER",
80 },
81 [EXTCON_CHG_USB_SLOW] = {
82 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
83 .id = EXTCON_CHG_USB_SLOW,
84 .name = "SLOW-CHARGER",
85 },
86 [EXTCON_CHG_WPT] = {
87 .type = EXTCON_TYPE_CHG,
88 .id = EXTCON_CHG_WPT,
89 .name = "WPT",
90 },
91 [EXTCON_CHG_USB_PD] = {
92 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
93 .id = EXTCON_CHG_USB_PD,
94 .name = "PD",
95 },
96
97 /* Jack external connector */
98 [EXTCON_JACK_MICROPHONE] = {
99 .type = EXTCON_TYPE_JACK,
100 .id = EXTCON_JACK_MICROPHONE,
101 .name = "MICROPHONE",
102 },
103 [EXTCON_JACK_HEADPHONE] = {
104 .type = EXTCON_TYPE_JACK,
105 .id = EXTCON_JACK_HEADPHONE,
106 .name = "HEADPHONE",
107 },
108 [EXTCON_JACK_LINE_IN] = {
109 .type = EXTCON_TYPE_JACK,
110 .id = EXTCON_JACK_LINE_IN,
111 .name = "LINE-IN",
112 },
113 [EXTCON_JACK_LINE_OUT] = {
114 .type = EXTCON_TYPE_JACK,
115 .id = EXTCON_JACK_LINE_OUT,
116 .name = "LINE-OUT",
117 },
118 [EXTCON_JACK_VIDEO_IN] = {
119 .type = EXTCON_TYPE_JACK,
120 .id = EXTCON_JACK_VIDEO_IN,
121 .name = "VIDEO-IN",
122 },
123 [EXTCON_JACK_VIDEO_OUT] = {
124 .type = EXTCON_TYPE_JACK,
125 .id = EXTCON_JACK_VIDEO_OUT,
126 .name = "VIDEO-OUT",
127 },
128 [EXTCON_JACK_SPDIF_IN] = {
129 .type = EXTCON_TYPE_JACK,
130 .id = EXTCON_JACK_SPDIF_IN,
131 .name = "SPDIF-IN",
132 },
133 [EXTCON_JACK_SPDIF_OUT] = {
134 .type = EXTCON_TYPE_JACK,
135 .id = EXTCON_JACK_SPDIF_OUT,
136 .name = "SPDIF-OUT",
137 },
138
139 /* Display external connector */
140 [EXTCON_DISP_HDMI] = {
141 .type = EXTCON_TYPE_DISP,
142 .id = EXTCON_DISP_HDMI,
143 .name = "HDMI",
144 },
145 [EXTCON_DISP_MHL] = {
146 .type = EXTCON_TYPE_DISP,
147 .id = EXTCON_DISP_MHL,
148 .name = "MHL",
149 },
150 [EXTCON_DISP_DVI] = {
151 .type = EXTCON_TYPE_DISP,
152 .id = EXTCON_DISP_DVI,
153 .name = "DVI",
154 },
155 [EXTCON_DISP_VGA] = {
156 .type = EXTCON_TYPE_DISP,
157 .id = EXTCON_DISP_VGA,
158 .name = "VGA",
159 },
160 [EXTCON_DISP_DP] = {
161 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
162 .id = EXTCON_DISP_DP,
163 .name = "DP",
164 },
165 [EXTCON_DISP_HMD] = {
166 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
167 .id = EXTCON_DISP_HMD,
168 .name = "HMD",
169 },
170
171 /* Miscellaneous external connector */
172 [EXTCON_DOCK] = {
173 .type = EXTCON_TYPE_MISC,
174 .id = EXTCON_DOCK,
175 .name = "DOCK",
176 },
177 [EXTCON_JIG] = {
178 .type = EXTCON_TYPE_MISC,
179 .id = EXTCON_JIG,
180 .name = "JIG",
181 },
182 [EXTCON_MECHANICAL] = {
183 .type = EXTCON_TYPE_MISC,
184 .id = EXTCON_MECHANICAL,
185 .name = "MECHANICAL",
186 },
187
188 { /* sentinel */ }
189 };
190
191 /**
192 * struct extcon_cable - An internal data for an external connector.
193 * @edev: the extcon device
194 * @cable_index: the index of this cable in the edev
195 * @attr_g: the attribute group for the cable
196 * @attr_name: "name" sysfs entry
197 * @attr_state: "state" sysfs entry
198 * @attrs: the array pointing to attr_name and attr_state for attr_g
199 * @usb_propval: the array of USB connector properties
200 * @chg_propval: the array of charger connector properties
201 * @jack_propval: the array of jack connector properties
202 * @disp_propval: the array of display connector properties
203 * @usb_bits: the bit array of the USB connector property capabilities
204 * @chg_bits: the bit array of the charger connector property capabilities
205 * @jack_bits: the bit array of the jack connector property capabilities
206 * @disp_bits: the bit array of the display connector property capabilities
207 */
208 struct 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
229 static struct class *extcon_class;
230
231 static LIST_HEAD(extcon_dev_list);
232 static DEFINE_MUTEX(extcon_dev_list_lock);
233
check_mutually_exclusive(struct extcon_dev * edev,u32 new_state)234 static 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
find_cable_index_by_id(struct extcon_dev * edev,const unsigned int id)254 static 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
get_extcon_type(unsigned int prop)267 static 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
is_extcon_attached(struct extcon_dev * edev,unsigned int index)283 static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
284 {
285 return !!(edev->state & BIT(index));
286 }
287
is_extcon_changed(struct extcon_dev * edev,int index,bool new_state)288 static 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
is_extcon_property_supported(unsigned int id,unsigned int prop)295 static 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
is_extcon_property_capability(struct extcon_dev * edev,unsigned int id,int index,unsigned int prop)308 static 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
init_property(struct extcon_dev * edev,unsigned int id,int index)341 static 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
state_show(struct device * dev,struct device_attribute * attr,char * buf)356 static 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 }
373 static DEVICE_ATTR_RO(state);
374
name_show(struct device * dev,struct device_attribute * attr,char * buf)375 static 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 }
382 static DEVICE_ATTR_RO(name);
383
cable_name_show(struct device * dev,struct device_attribute * attr,char * buf)384 static 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
cable_state_show(struct device * dev,struct device_attribute * attr,char * buf)395 static 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 */
extcon_sync(struct extcon_dev * edev,unsigned int id)416 int 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 state = !!(edev->state & BIT(index));
437 spin_unlock_irqrestore(&edev->lock, flags);
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 spin_lock_irqsave(&edev->lock, flags);
452 /* This could be in interrupt handler */
453 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
454 if (!prop_buf) {
455 /* Unlock early before uevent */
456 spin_unlock_irqrestore(&edev->lock, flags);
457
458 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
459 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
460
461 return -ENOMEM;
462 }
463
464 length = name_show(&edev->dev, NULL, prop_buf);
465 if (length > 0) {
466 if (prop_buf[length - 1] == '\n')
467 prop_buf[length - 1] = 0;
468 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
469 envp[env_offset++] = name_buf;
470 }
471
472 length = state_show(&edev->dev, NULL, prop_buf);
473 if (length > 0) {
474 if (prop_buf[length - 1] == '\n')
475 prop_buf[length - 1] = 0;
476 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
477 envp[env_offset++] = state_buf;
478 }
479 envp[env_offset] = NULL;
480
481 /* Unlock early before uevent */
482 spin_unlock_irqrestore(&edev->lock, flags);
483 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
484 free_page((unsigned long)prop_buf);
485
486 return 0;
487 }
488 EXPORT_SYMBOL_GPL(extcon_sync);
489
490 /**
491 * extcon_get_state() - Get the state of an external connector.
492 * @edev: the extcon device
493 * @id: the unique id indicating an external connector
494 *
495 * Returns 0 if success or error number if fail.
496 */
extcon_get_state(struct extcon_dev * edev,unsigned int id)497 int extcon_get_state(struct extcon_dev *edev, unsigned int id)
498 {
499 int index, state;
500 unsigned long flags;
501
502 if (!edev)
503 return -EINVAL;
504
505 index = find_cable_index_by_id(edev, id);
506 if (index < 0)
507 return index;
508
509 spin_lock_irqsave(&edev->lock, flags);
510 state = is_extcon_attached(edev, index);
511 spin_unlock_irqrestore(&edev->lock, flags);
512
513 return state;
514 }
515 EXPORT_SYMBOL_GPL(extcon_get_state);
516
517 /**
518 * extcon_set_state() - Set the state of an external connector.
519 * @edev: the extcon device
520 * @id: the unique id indicating an external connector
521 * @state: the new state of an external connector.
522 * the default semantics is true: attached / false: detached.
523 *
524 * Note that this function set the state of an external connector without
525 * a notification. To synchronize the state of an external connector,
526 * have to use extcon_set_state_sync() and extcon_sync().
527 *
528 * Returns 0 if success or error number if fail.
529 */
extcon_set_state(struct extcon_dev * edev,unsigned int id,bool state)530 int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
531 {
532 unsigned long flags;
533 int index, ret = 0;
534
535 if (!edev)
536 return -EINVAL;
537
538 index = find_cable_index_by_id(edev, id);
539 if (index < 0)
540 return index;
541
542 spin_lock_irqsave(&edev->lock, flags);
543
544 /* Check whether the external connector's state is changed. */
545 if (!is_extcon_changed(edev, index, state))
546 goto out;
547
548 if (check_mutually_exclusive(edev,
549 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
550 ret = -EPERM;
551 goto out;
552 }
553
554 /*
555 * Initialize the value of extcon property before setting
556 * the detached state for an external connector.
557 */
558 if (!state)
559 init_property(edev, id, index);
560
561 /* Update the state for an external connector. */
562 if (state)
563 edev->state |= BIT(index);
564 else
565 edev->state &= ~(BIT(index));
566 out:
567 spin_unlock_irqrestore(&edev->lock, flags);
568
569 return ret;
570 }
571 EXPORT_SYMBOL_GPL(extcon_set_state);
572
573 /**
574 * extcon_set_state_sync() - Set the state of an external connector with sync.
575 * @edev: the extcon device
576 * @id: the unique id indicating an external connector
577 * @state: the new state of external connector.
578 * the default semantics is true: attached / false: detached.
579 *
580 * Note that this function set the state of external connector
581 * and synchronize the state by sending a notification.
582 *
583 * Returns 0 if success or error number if fail.
584 */
extcon_set_state_sync(struct extcon_dev * edev,unsigned int id,bool state)585 int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
586 {
587 int ret, index;
588 unsigned long flags;
589
590 index = find_cable_index_by_id(edev, id);
591 if (index < 0)
592 return index;
593
594 /* Check whether the external connector's state is changed. */
595 spin_lock_irqsave(&edev->lock, flags);
596 ret = is_extcon_changed(edev, index, state);
597 spin_unlock_irqrestore(&edev->lock, flags);
598 if (!ret)
599 return 0;
600
601 ret = extcon_set_state(edev, id, state);
602 if (ret < 0)
603 return ret;
604
605 return extcon_sync(edev, id);
606 }
607 EXPORT_SYMBOL_GPL(extcon_set_state_sync);
608
609 /**
610 * extcon_get_property() - Get the property value of an external connector.
611 * @edev: the extcon device
612 * @id: the unique id indicating an external connector
613 * @prop: the property id indicating an extcon property
614 * @prop_val: the pointer which store the value of extcon property
615 *
616 * Note that when getting the property value of external connector,
617 * the external connector should be attached. If detached state, function
618 * return 0 without property value. Also, the each property should be
619 * included in the list of supported properties according to extcon type.
620 *
621 * Returns 0 if success or error number if fail.
622 */
extcon_get_property(struct extcon_dev * edev,unsigned int id,unsigned int prop,union extcon_property_value * prop_val)623 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
624 unsigned int prop,
625 union extcon_property_value *prop_val)
626 {
627 struct extcon_cable *cable;
628 unsigned long flags;
629 int index, ret = 0;
630
631 *prop_val = (union extcon_property_value){0};
632
633 if (!edev)
634 return -EINVAL;
635
636 /* Check whether the property is supported or not */
637 if (!is_extcon_property_supported(id, prop))
638 return -EINVAL;
639
640 /* Find the cable index of external connector by using id */
641 index = find_cable_index_by_id(edev, id);
642 if (index < 0)
643 return index;
644
645 spin_lock_irqsave(&edev->lock, flags);
646
647 /* Check whether the property is available or not. */
648 if (!is_extcon_property_capability(edev, id, index, prop)) {
649 spin_unlock_irqrestore(&edev->lock, flags);
650 return -EPERM;
651 }
652
653 /*
654 * Check whether the external connector is attached.
655 * If external connector is detached, the user can not
656 * get the property value.
657 */
658 if (!is_extcon_attached(edev, index)) {
659 spin_unlock_irqrestore(&edev->lock, flags);
660 return 0;
661 }
662
663 cable = &edev->cables[index];
664
665 /* Get the property value according to extcon type */
666 switch (prop) {
667 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
668 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
669 break;
670 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
671 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
672 break;
673 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
674 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
675 break;
676 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
677 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
678 break;
679 default:
680 ret = -EINVAL;
681 break;
682 }
683
684 spin_unlock_irqrestore(&edev->lock, flags);
685
686 return ret;
687 }
688 EXPORT_SYMBOL_GPL(extcon_get_property);
689
690 /**
691 * extcon_set_property() - Set the property value of an external connector.
692 * @edev: the extcon device
693 * @id: the unique id indicating an external connector
694 * @prop: the property id indicating an extcon property
695 * @prop_val: the pointer including the new value of extcon property
696 *
697 * Note that each property should be included in the list of supported
698 * properties according to the extcon type.
699 *
700 * Returns 0 if success or error number if fail.
701 */
extcon_set_property(struct extcon_dev * edev,unsigned int id,unsigned int prop,union extcon_property_value prop_val)702 int extcon_set_property(struct extcon_dev *edev, unsigned int id,
703 unsigned int prop,
704 union extcon_property_value prop_val)
705 {
706 struct extcon_cable *cable;
707 unsigned long flags;
708 int index, ret = 0;
709
710 if (!edev)
711 return -EINVAL;
712
713 /* Check whether the property is supported or not */
714 if (!is_extcon_property_supported(id, prop))
715 return -EINVAL;
716
717 /* Find the cable index of external connector by using id */
718 index = find_cable_index_by_id(edev, id);
719 if (index < 0)
720 return index;
721
722 spin_lock_irqsave(&edev->lock, flags);
723
724 /* Check whether the property is available or not. */
725 if (!is_extcon_property_capability(edev, id, index, prop)) {
726 spin_unlock_irqrestore(&edev->lock, flags);
727 return -EPERM;
728 }
729
730 cable = &edev->cables[index];
731
732 /* Set the property value according to extcon type */
733 switch (prop) {
734 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
735 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
736 break;
737 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
738 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
739 break;
740 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
741 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
742 break;
743 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
744 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
745 break;
746 default:
747 ret = -EINVAL;
748 break;
749 }
750
751 spin_unlock_irqrestore(&edev->lock, flags);
752
753 return ret;
754 }
755 EXPORT_SYMBOL_GPL(extcon_set_property);
756
757 /**
758 * extcon_set_property_sync() - Set property of an external connector with sync.
759 * @prop_val: the pointer including the new value of extcon property
760 *
761 * Note that when setting the property value of external connector,
762 * the external connector should be attached. The each property should
763 * be included in the list of supported properties according to extcon type.
764 *
765 * Returns 0 if success or error number if fail.
766 */
extcon_set_property_sync(struct extcon_dev * edev,unsigned int id,unsigned int prop,union extcon_property_value prop_val)767 int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
768 unsigned int prop,
769 union extcon_property_value prop_val)
770 {
771 int ret;
772
773 ret = extcon_set_property(edev, id, prop, prop_val);
774 if (ret < 0)
775 return ret;
776
777 return extcon_sync(edev, id);
778 }
779 EXPORT_SYMBOL_GPL(extcon_set_property_sync);
780
781 /**
782 * extcon_get_property_capability() - Get the capability of the property
783 * for an external connector.
784 * @edev: the extcon device
785 * @id: the unique id indicating an external connector
786 * @prop: the property id indicating an extcon property
787 *
788 * Returns 1 if the property is available or 0 if not available.
789 */
extcon_get_property_capability(struct extcon_dev * edev,unsigned int id,unsigned int prop)790 int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
791 unsigned int prop)
792 {
793 int index;
794
795 if (!edev)
796 return -EINVAL;
797
798 /* Check whether the property is supported or not */
799 if (!is_extcon_property_supported(id, prop))
800 return -EINVAL;
801
802 /* Find the cable index of external connector by using id */
803 index = find_cable_index_by_id(edev, id);
804 if (index < 0)
805 return index;
806
807 return is_extcon_property_capability(edev, id, index, prop);
808 }
809 EXPORT_SYMBOL_GPL(extcon_get_property_capability);
810
811 /**
812 * extcon_set_property_capability() - Set the capability of the property
813 * for an external connector.
814 * @edev: the extcon device
815 * @id: the unique id indicating an external connector
816 * @prop: the property id indicating an extcon property
817 *
818 * Note that this function set the capability of the property
819 * for an external connector in order to mark the bit in capability
820 * bitmap which mean the available state of the property.
821 *
822 * Returns 0 if success or error number if fail.
823 */
extcon_set_property_capability(struct extcon_dev * edev,unsigned int id,unsigned int prop)824 int 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 }
867 EXPORT_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 *
873 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
874 */
extcon_get_extcon_dev(const char * extcon_name)875 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
876 {
877 struct extcon_dev *sd;
878
879 if (!extcon_name)
880 return ERR_PTR(-EINVAL);
881
882 mutex_lock(&extcon_dev_list_lock);
883 list_for_each_entry(sd, &extcon_dev_list, entry) {
884 if (!strcmp(sd->name, extcon_name))
885 goto out;
886 }
887 sd = NULL;
888 out:
889 mutex_unlock(&extcon_dev_list_lock);
890 return sd;
891 }
892 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
893
894 /**
895 * extcon_register_notifier() - Register a notifier block to get notified by
896 * any state changes from the extcon.
897 * @edev: the extcon device
898 * @id: the unique id indicating an external connector
899 * @nb: a notifier block to be registered
900 *
901 * Note that the second parameter given to the callback of nb (val) is
902 * the current state of an external connector and the third pameter
903 * is the pointer of extcon device.
904 *
905 * Returns 0 if success or error number if fail.
906 */
extcon_register_notifier(struct extcon_dev * edev,unsigned int id,struct notifier_block * nb)907 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
908 struct notifier_block *nb)
909 {
910 unsigned long flags;
911 int ret, idx;
912
913 if (!edev || !nb)
914 return -EINVAL;
915
916 idx = find_cable_index_by_id(edev, id);
917 if (idx < 0)
918 return idx;
919
920 spin_lock_irqsave(&edev->lock, flags);
921 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
922 spin_unlock_irqrestore(&edev->lock, flags);
923
924 return ret;
925 }
926 EXPORT_SYMBOL_GPL(extcon_register_notifier);
927
928 /**
929 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
930 * @edev: the extcon device
931 * @id: the unique id indicating an external connector
932 * @nb: a notifier block to be registered
933 *
934 * Returns 0 if success or error number if fail.
935 */
extcon_unregister_notifier(struct extcon_dev * edev,unsigned int id,struct notifier_block * nb)936 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
937 struct notifier_block *nb)
938 {
939 unsigned long flags;
940 int ret, idx;
941
942 if (!edev || !nb)
943 return -EINVAL;
944
945 idx = find_cable_index_by_id(edev, id);
946 if (idx < 0)
947 return idx;
948
949 spin_lock_irqsave(&edev->lock, flags);
950 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
951 spin_unlock_irqrestore(&edev->lock, flags);
952
953 return ret;
954 }
955 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
956
957 /**
958 * extcon_register_notifier_all() - Register a notifier block for all connectors.
959 * @edev: the extcon device
960 * @nb: a notifier block to be registered
961 *
962 * Note that this function registers a notifier block in order to receive
963 * the state change of all supported external connectors from extcon device.
964 * And the second parameter given to the callback of nb (val) is
965 * the current state and the third pameter is the pointer of extcon device.
966 *
967 * Returns 0 if success or error number if fail.
968 */
extcon_register_notifier_all(struct extcon_dev * edev,struct notifier_block * nb)969 int extcon_register_notifier_all(struct extcon_dev *edev,
970 struct notifier_block *nb)
971 {
972 unsigned long flags;
973 int ret;
974
975 if (!edev || !nb)
976 return -EINVAL;
977
978 spin_lock_irqsave(&edev->lock, flags);
979 ret = raw_notifier_chain_register(&edev->nh_all, nb);
980 spin_unlock_irqrestore(&edev->lock, flags);
981
982 return ret;
983 }
984 EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
985
986 /**
987 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
988 * @edev: the extcon device
989 * @nb: a notifier block to be registered
990 *
991 * Returns 0 if success or error number if fail.
992 */
extcon_unregister_notifier_all(struct extcon_dev * edev,struct notifier_block * nb)993 int extcon_unregister_notifier_all(struct extcon_dev *edev,
994 struct notifier_block *nb)
995 {
996 unsigned long flags;
997 int ret;
998
999 if (!edev || !nb)
1000 return -EINVAL;
1001
1002 spin_lock_irqsave(&edev->lock, flags);
1003 ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
1004 spin_unlock_irqrestore(&edev->lock, flags);
1005
1006 return ret;
1007 }
1008 EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1009
1010 static struct attribute *extcon_attrs[] = {
1011 &dev_attr_state.attr,
1012 &dev_attr_name.attr,
1013 NULL,
1014 };
1015 ATTRIBUTE_GROUPS(extcon);
1016
create_extcon_class(void)1017 static int create_extcon_class(void)
1018 {
1019 if (!extcon_class) {
1020 extcon_class = class_create(THIS_MODULE, "extcon");
1021 if (IS_ERR(extcon_class))
1022 return PTR_ERR(extcon_class);
1023 extcon_class->dev_groups = extcon_groups;
1024 }
1025
1026 return 0;
1027 }
1028
extcon_dev_release(struct device * dev)1029 static void extcon_dev_release(struct device *dev)
1030 {
1031 }
1032
1033 static const char *muex_name = "mutually_exclusive";
dummy_sysfs_dev_release(struct device * dev)1034 static void dummy_sysfs_dev_release(struct device *dev)
1035 {
1036 }
1037
1038 /*
1039 * extcon_dev_allocate() - Allocate the memory of extcon device.
1040 * @supported_cable: the array of the supported external connectors
1041 * ending with EXTCON_NONE.
1042 *
1043 * Note that this function allocates the memory for extcon device
1044 * and initialize default setting for the extcon device.
1045 *
1046 * Returns the pointer memory of allocated extcon_dev if success
1047 * or ERR_PTR(err) if fail.
1048 */
extcon_dev_allocate(const unsigned int * supported_cable)1049 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1050 {
1051 struct extcon_dev *edev;
1052
1053 if (!supported_cable)
1054 return ERR_PTR(-EINVAL);
1055
1056 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1057 if (!edev)
1058 return ERR_PTR(-ENOMEM);
1059
1060 edev->max_supported = 0;
1061 edev->supported_cable = supported_cable;
1062
1063 return edev;
1064 }
1065
1066 /*
1067 * extcon_dev_free() - Free the memory of extcon device.
1068 * @edev: the extcon device
1069 */
extcon_dev_free(struct extcon_dev * edev)1070 void extcon_dev_free(struct extcon_dev *edev)
1071 {
1072 kfree(edev);
1073 }
1074 EXPORT_SYMBOL_GPL(extcon_dev_free);
1075
1076 /**
1077 * extcon_dev_register() - Register an new extcon device
1078 * @edev: the extcon device to be registered
1079 *
1080 * Among the members of edev struct, please set the "user initializing data"
1081 * do not set the values of "internal data", which are initialized by
1082 * this function.
1083 *
1084 * Note that before calling this funciton, have to allocate the memory
1085 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1086 * dev should include the supported_cable information.
1087 *
1088 * Returns 0 if success or error number if fail.
1089 */
extcon_dev_register(struct extcon_dev * edev)1090 int extcon_dev_register(struct extcon_dev *edev)
1091 {
1092 int ret, index = 0;
1093 static atomic_t edev_no = ATOMIC_INIT(-1);
1094
1095 if (!extcon_class) {
1096 ret = create_extcon_class();
1097 if (ret < 0)
1098 return ret;
1099 }
1100
1101 if (!edev || !edev->supported_cable)
1102 return -EINVAL;
1103
1104 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1105
1106 edev->max_supported = index;
1107 if (index > SUPPORTED_CABLE_MAX) {
1108 dev_err(&edev->dev,
1109 "exceed the maximum number of supported cables\n");
1110 return -EINVAL;
1111 }
1112
1113 edev->dev.class = extcon_class;
1114 edev->dev.release = extcon_dev_release;
1115
1116 edev->name = dev_name(edev->dev.parent);
1117 if (IS_ERR_OR_NULL(edev->name)) {
1118 dev_err(&edev->dev,
1119 "extcon device name is null\n");
1120 return -EINVAL;
1121 }
1122 dev_set_name(&edev->dev, "extcon%lu",
1123 (unsigned long)atomic_inc_return(&edev_no));
1124
1125 if (edev->max_supported) {
1126 char *str;
1127 struct extcon_cable *cable;
1128
1129 edev->cables = kcalloc(edev->max_supported,
1130 sizeof(struct extcon_cable),
1131 GFP_KERNEL);
1132 if (!edev->cables) {
1133 ret = -ENOMEM;
1134 goto err_sysfs_alloc;
1135 }
1136 for (index = 0; index < edev->max_supported; index++) {
1137 cable = &edev->cables[index];
1138
1139 str = kasprintf(GFP_KERNEL, "cable.%d", index);
1140 if (!str) {
1141 for (index--; index >= 0; index--) {
1142 cable = &edev->cables[index];
1143 kfree(cable->attr_g.name);
1144 }
1145 ret = -ENOMEM;
1146
1147 goto err_alloc_cables;
1148 }
1149
1150 cable->edev = edev;
1151 cable->cable_index = index;
1152 cable->attrs[0] = &cable->attr_name.attr;
1153 cable->attrs[1] = &cable->attr_state.attr;
1154 cable->attrs[2] = NULL;
1155 cable->attr_g.name = str;
1156 cable->attr_g.attrs = cable->attrs;
1157
1158 sysfs_attr_init(&cable->attr_name.attr);
1159 cable->attr_name.attr.name = "name";
1160 cable->attr_name.attr.mode = 0444;
1161 cable->attr_name.show = cable_name_show;
1162
1163 sysfs_attr_init(&cable->attr_state.attr);
1164 cable->attr_state.attr.name = "state";
1165 cable->attr_state.attr.mode = 0444;
1166 cable->attr_state.show = cable_state_show;
1167 }
1168 }
1169
1170 if (edev->max_supported && edev->mutually_exclusive) {
1171 char *name;
1172
1173 /* Count the size of mutually_exclusive array */
1174 for (index = 0; edev->mutually_exclusive[index]; index++)
1175 ;
1176
1177 edev->attrs_muex = kcalloc(index + 1,
1178 sizeof(struct attribute *),
1179 GFP_KERNEL);
1180 if (!edev->attrs_muex) {
1181 ret = -ENOMEM;
1182 goto err_muex;
1183 }
1184
1185 edev->d_attrs_muex = kcalloc(index,
1186 sizeof(struct device_attribute),
1187 GFP_KERNEL);
1188 if (!edev->d_attrs_muex) {
1189 ret = -ENOMEM;
1190 kfree(edev->attrs_muex);
1191 goto err_muex;
1192 }
1193
1194 for (index = 0; edev->mutually_exclusive[index]; index++) {
1195 name = kasprintf(GFP_KERNEL, "0x%x",
1196 edev->mutually_exclusive[index]);
1197 if (!name) {
1198 for (index--; index >= 0; index--) {
1199 kfree(edev->d_attrs_muex[index].attr.
1200 name);
1201 }
1202 kfree(edev->d_attrs_muex);
1203 kfree(edev->attrs_muex);
1204 ret = -ENOMEM;
1205 goto err_muex;
1206 }
1207 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1208 edev->d_attrs_muex[index].attr.name = name;
1209 edev->d_attrs_muex[index].attr.mode = 0000;
1210 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1211 .attr;
1212 }
1213 edev->attr_g_muex.name = muex_name;
1214 edev->attr_g_muex.attrs = edev->attrs_muex;
1215
1216 }
1217
1218 if (edev->max_supported) {
1219 edev->extcon_dev_type.groups =
1220 kcalloc(edev->max_supported + 2,
1221 sizeof(struct attribute_group *),
1222 GFP_KERNEL);
1223 if (!edev->extcon_dev_type.groups) {
1224 ret = -ENOMEM;
1225 goto err_alloc_groups;
1226 }
1227
1228 edev->extcon_dev_type.name = dev_name(&edev->dev);
1229 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1230
1231 for (index = 0; index < edev->max_supported; index++)
1232 edev->extcon_dev_type.groups[index] =
1233 &edev->cables[index].attr_g;
1234 if (edev->mutually_exclusive)
1235 edev->extcon_dev_type.groups[index] =
1236 &edev->attr_g_muex;
1237
1238 edev->dev.type = &edev->extcon_dev_type;
1239 }
1240
1241 spin_lock_init(&edev->lock);
1242 if (edev->max_supported) {
1243 edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh),
1244 GFP_KERNEL);
1245 if (!edev->nh) {
1246 ret = -ENOMEM;
1247 goto err_alloc_nh;
1248 }
1249 }
1250
1251 for (index = 0; index < edev->max_supported; index++)
1252 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1253
1254 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1255
1256 dev_set_drvdata(&edev->dev, edev);
1257 edev->state = 0;
1258
1259 ret = device_register(&edev->dev);
1260 if (ret) {
1261 put_device(&edev->dev);
1262 goto err_dev;
1263 }
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
1271 err_dev:
1272 if (edev->max_supported)
1273 kfree(edev->nh);
1274 err_alloc_nh:
1275 if (edev->max_supported)
1276 kfree(edev->extcon_dev_type.groups);
1277 err_alloc_groups:
1278 if (edev->max_supported && edev->mutually_exclusive) {
1279 for (index = 0; edev->mutually_exclusive[index]; index++)
1280 kfree(edev->d_attrs_muex[index].attr.name);
1281 kfree(edev->d_attrs_muex);
1282 kfree(edev->attrs_muex);
1283 }
1284 err_muex:
1285 for (index = 0; index < edev->max_supported; index++)
1286 kfree(edev->cables[index].attr_g.name);
1287 err_alloc_cables:
1288 if (edev->max_supported)
1289 kfree(edev->cables);
1290 err_sysfs_alloc:
1291 return ret;
1292 }
1293 EXPORT_SYMBOL_GPL(extcon_dev_register);
1294
1295 /**
1296 * extcon_dev_unregister() - Unregister the extcon device.
1297 * @edev: the extcon device to be unregistered.
1298 *
1299 * Note that this does not call kfree(edev) because edev was not allocated
1300 * by this class.
1301 */
extcon_dev_unregister(struct extcon_dev * edev)1302 void extcon_dev_unregister(struct extcon_dev *edev)
1303 {
1304 int index;
1305
1306 if (!edev)
1307 return;
1308
1309 mutex_lock(&extcon_dev_list_lock);
1310 list_del(&edev->entry);
1311 mutex_unlock(&extcon_dev_list_lock);
1312
1313 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1314 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1315 dev_name(&edev->dev));
1316 return;
1317 }
1318
1319 device_unregister(&edev->dev);
1320
1321 if (edev->mutually_exclusive && edev->max_supported) {
1322 for (index = 0; edev->mutually_exclusive[index];
1323 index++)
1324 kfree(edev->d_attrs_muex[index].attr.name);
1325 kfree(edev->d_attrs_muex);
1326 kfree(edev->attrs_muex);
1327 }
1328
1329 for (index = 0; index < edev->max_supported; index++)
1330 kfree(edev->cables[index].attr_g.name);
1331
1332 if (edev->max_supported) {
1333 kfree(edev->extcon_dev_type.groups);
1334 kfree(edev->cables);
1335 kfree(edev->nh);
1336 }
1337
1338 put_device(&edev->dev);
1339 }
1340 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1341
1342 #ifdef CONFIG_OF
1343
1344 /*
1345 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1346 * @node : OF node identifying edev
1347 *
1348 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1349 */
extcon_find_edev_by_node(struct device_node * node)1350 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1351 {
1352 struct extcon_dev *edev;
1353
1354 mutex_lock(&extcon_dev_list_lock);
1355 list_for_each_entry(edev, &extcon_dev_list, entry)
1356 if (edev->dev.parent && edev->dev.parent->of_node == node)
1357 goto out;
1358 edev = ERR_PTR(-EPROBE_DEFER);
1359 out:
1360 mutex_unlock(&extcon_dev_list_lock);
1361
1362 return edev;
1363 }
1364
1365 /*
1366 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1367 * @dev : the instance to the given device
1368 * @index : the index into list of extcon_dev
1369 *
1370 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1371 */
extcon_get_edev_by_phandle(struct device * dev,int index)1372 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1373 {
1374 struct device_node *node;
1375 struct extcon_dev *edev;
1376
1377 if (!dev)
1378 return ERR_PTR(-EINVAL);
1379
1380 if (!dev->of_node) {
1381 dev_dbg(dev, "device does not have a device node entry\n");
1382 return ERR_PTR(-EINVAL);
1383 }
1384
1385 node = of_parse_phandle(dev->of_node, "extcon", index);
1386 if (!node) {
1387 dev_dbg(dev, "failed to get phandle in %pOF node\n",
1388 dev->of_node);
1389 return ERR_PTR(-ENODEV);
1390 }
1391
1392 edev = extcon_find_edev_by_node(node);
1393 of_node_put(node);
1394
1395 return edev;
1396 }
1397
1398 #else
1399
extcon_find_edev_by_node(struct device_node * node)1400 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1401 {
1402 return ERR_PTR(-ENOSYS);
1403 }
1404
extcon_get_edev_by_phandle(struct device * dev,int index)1405 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1406 {
1407 return ERR_PTR(-ENOSYS);
1408 }
1409
1410 #endif /* CONFIG_OF */
1411
1412 EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1413 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1414
1415 /**
1416 * extcon_get_edev_name() - Get the name of the extcon device.
1417 * @edev: the extcon device
1418 */
extcon_get_edev_name(struct extcon_dev * edev)1419 const char *extcon_get_edev_name(struct extcon_dev *edev)
1420 {
1421 return !edev ? NULL : edev->name;
1422 }
1423 EXPORT_SYMBOL_GPL(extcon_get_edev_name);
1424
extcon_class_init(void)1425 static int __init extcon_class_init(void)
1426 {
1427 return create_extcon_class();
1428 }
1429 module_init(extcon_class_init);
1430
extcon_class_exit(void)1431 static void __exit extcon_class_exit(void)
1432 {
1433 class_destroy(extcon_class);
1434 }
1435 module_exit(extcon_class_exit);
1436
1437 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1438 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1439 MODULE_DESCRIPTION("External Connector (extcon) framework");
1440 MODULE_LICENSE("GPL v2");
1441