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 [EXTCON_DISP_CVBS] = {
171 .type = EXTCON_TYPE_DISP,
172 .id = EXTCON_DISP_CVBS,
173 .name = "CVBS",
174 },
175 [EXTCON_DISP_EDP] = {
176 .type = EXTCON_TYPE_DISP,
177 .id = EXTCON_DISP_EDP,
178 .name = "EDP",
179 },
180
181 /* Miscellaneous external connector */
182 [EXTCON_DOCK] = {
183 .type = EXTCON_TYPE_MISC,
184 .id = EXTCON_DOCK,
185 .name = "DOCK",
186 },
187 [EXTCON_JIG] = {
188 .type = EXTCON_TYPE_MISC,
189 .id = EXTCON_JIG,
190 .name = "JIG",
191 },
192 [EXTCON_MECHANICAL] = {
193 .type = EXTCON_TYPE_MISC,
194 .id = EXTCON_MECHANICAL,
195 .name = "MECHANICAL",
196 },
197
198 { /* sentinel */ }
199 };
200
201 /**
202 * struct extcon_cable - An internal data for an external connector.
203 * @edev: the extcon device
204 * @cable_index: the index of this cable in the edev
205 * @attr_g: the attribute group for the cable
206 * @attr_name: "name" sysfs entry
207 * @attr_state: "state" sysfs entry
208 * @attrs: the array pointing to attr_name and attr_state for attr_g
209 * @usb_propval: the array of USB connector properties
210 * @chg_propval: the array of charger connector properties
211 * @jack_propval: the array of jack connector properties
212 * @disp_propval: the array of display connector properties
213 * @usb_bits: the bit array of the USB connector property capabilities
214 * @chg_bits: the bit array of the charger connector property capabilities
215 * @jack_bits: the bit array of the jack connector property capabilities
216 * @disp_bits: the bit array of the display connector property capabilities
217 */
218 struct extcon_cable {
219 struct extcon_dev *edev;
220 int cable_index;
221
222 struct attribute_group attr_g;
223 struct device_attribute attr_name;
224 struct device_attribute attr_state;
225
226 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
227
228 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
229 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
230 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
231 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
232
233 unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
234 unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
235 unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
236 unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
237 };
238
239 static struct class *extcon_class;
240
241 static LIST_HEAD(extcon_dev_list);
242 static DEFINE_MUTEX(extcon_dev_list_lock);
243
check_mutually_exclusive(struct extcon_dev * edev,u32 new_state)244 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
245 {
246 int i = 0;
247
248 if (!edev->mutually_exclusive)
249 return 0;
250
251 for (i = 0; edev->mutually_exclusive[i]; i++) {
252 int weight;
253 u32 correspondants = new_state & edev->mutually_exclusive[i];
254
255 /* calculate the total number of bits set */
256 weight = hweight32(correspondants);
257 if (weight > 1)
258 return i + 1;
259 }
260
261 return 0;
262 }
263
find_cable_index_by_id(struct extcon_dev * edev,const unsigned int id)264 static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
265 {
266 int i;
267
268 /* Find the the index of extcon cable in edev->supported_cable */
269 for (i = 0; i < edev->max_supported; i++) {
270 if (edev->supported_cable[i] == id)
271 return i;
272 }
273
274 return -EINVAL;
275 }
276
get_extcon_type(unsigned int prop)277 static int get_extcon_type(unsigned int prop)
278 {
279 switch (prop) {
280 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
281 return EXTCON_TYPE_USB;
282 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
283 return EXTCON_TYPE_CHG;
284 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
285 return EXTCON_TYPE_JACK;
286 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
287 return EXTCON_TYPE_DISP;
288 default:
289 return -EINVAL;
290 }
291 }
292
is_extcon_attached(struct extcon_dev * edev,unsigned int index)293 static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
294 {
295 return !!(edev->state & BIT(index));
296 }
297
is_extcon_changed(struct extcon_dev * edev,int index,bool new_state)298 static bool is_extcon_changed(struct extcon_dev *edev, int index,
299 bool new_state)
300 {
301 int state = !!(edev->state & BIT(index));
302 return (state != new_state);
303 }
304
is_extcon_property_supported(unsigned int id,unsigned int prop)305 static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
306 {
307 int type;
308
309 /* Check whether the property is supported or not. */
310 type = get_extcon_type(prop);
311 if (type < 0)
312 return false;
313
314 /* Check whether a specific extcon id supports the property or not. */
315 return !!(extcon_info[id].type & type);
316 }
317
is_extcon_property_capability(struct extcon_dev * edev,unsigned int id,int index,unsigned int prop)318 static int is_extcon_property_capability(struct extcon_dev *edev,
319 unsigned int id, int index,unsigned int prop)
320 {
321 struct extcon_cable *cable;
322 int type, ret;
323
324 /* Check whether the property is supported or not. */
325 type = get_extcon_type(prop);
326 if (type < 0)
327 return type;
328
329 cable = &edev->cables[index];
330
331 switch (type) {
332 case EXTCON_TYPE_USB:
333 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
334 break;
335 case EXTCON_TYPE_CHG:
336 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
337 break;
338 case EXTCON_TYPE_JACK:
339 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
340 break;
341 case EXTCON_TYPE_DISP:
342 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
343 break;
344 default:
345 ret = -EINVAL;
346 }
347
348 return ret;
349 }
350
init_property(struct extcon_dev * edev,unsigned int id,int index)351 static void init_property(struct extcon_dev *edev, unsigned int id, int index)
352 {
353 unsigned int type = extcon_info[id].type;
354 struct extcon_cable *cable = &edev->cables[index];
355
356 if (EXTCON_TYPE_USB & type)
357 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
358 if (EXTCON_TYPE_CHG & type)
359 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
360 if (EXTCON_TYPE_JACK & type)
361 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
362 if (EXTCON_TYPE_DISP & type)
363 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
364 }
365
state_show(struct device * dev,struct device_attribute * attr,char * buf)366 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
367 char *buf)
368 {
369 int i, count = 0;
370 struct extcon_dev *edev = dev_get_drvdata(dev);
371
372 if (edev->max_supported == 0)
373 return sprintf(buf, "%u\n", edev->state);
374
375 for (i = 0; i < edev->max_supported; i++) {
376 count += sprintf(buf + count, "%s=%d\n",
377 extcon_info[edev->supported_cable[i]].name,
378 !!(edev->state & BIT(i)));
379 }
380
381 return count;
382 }
383 static DEVICE_ATTR_RO(state);
384
name_show(struct device * dev,struct device_attribute * attr,char * buf)385 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
386 char *buf)
387 {
388 struct extcon_dev *edev = dev_get_drvdata(dev);
389
390 return sprintf(buf, "%s\n", edev->name);
391 }
392 static DEVICE_ATTR_RO(name);
393
cable_name_show(struct device * dev,struct device_attribute * attr,char * buf)394 static ssize_t cable_name_show(struct device *dev,
395 struct device_attribute *attr, char *buf)
396 {
397 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
398 attr_name);
399 int i = cable->cable_index;
400
401 return sprintf(buf, "%s\n",
402 extcon_info[cable->edev->supported_cable[i]].name);
403 }
404
cable_state_show(struct device * dev,struct device_attribute * attr,char * buf)405 static ssize_t cable_state_show(struct device *dev,
406 struct device_attribute *attr, char *buf)
407 {
408 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
409 attr_state);
410
411 int i = cable->cable_index;
412
413 return sprintf(buf, "%d\n",
414 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
415 }
416
417 /**
418 * extcon_sync() - Synchronize the state for an external connector.
419 * @edev: the extcon device
420 *
421 * Note that this function send a notification in order to synchronize
422 * the state and property of an external connector.
423 *
424 * Returns 0 if success or error number if fail.
425 */
extcon_sync(struct extcon_dev * edev,unsigned int id)426 int extcon_sync(struct extcon_dev *edev, unsigned int id)
427 {
428 char name_buf[120];
429 char state_buf[120];
430 char *prop_buf;
431 char *envp[3];
432 int env_offset = 0;
433 int length;
434 int index;
435 int state;
436 unsigned long flags;
437
438 if (!edev)
439 return -EINVAL;
440
441 index = find_cable_index_by_id(edev, id);
442 if (index < 0)
443 return index;
444
445 spin_lock_irqsave(&edev->lock, flags);
446 state = !!(edev->state & BIT(index));
447 spin_unlock_irqrestore(&edev->lock, flags);
448
449 /*
450 * Call functions in a raw notifier chain for the specific one
451 * external connector.
452 */
453 raw_notifier_call_chain(&edev->nh[index], state, edev);
454
455 /*
456 * Call functions in a raw notifier chain for the all supported
457 * external connectors.
458 */
459 raw_notifier_call_chain(&edev->nh_all, state, edev);
460
461 spin_lock_irqsave(&edev->lock, flags);
462 /* This could be in interrupt handler */
463 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
464 if (!prop_buf) {
465 /* Unlock early before uevent */
466 spin_unlock_irqrestore(&edev->lock, flags);
467
468 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
469 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
470
471 return -ENOMEM;
472 }
473
474 length = name_show(&edev->dev, NULL, prop_buf);
475 if (length > 0) {
476 if (prop_buf[length - 1] == '\n')
477 prop_buf[length - 1] = 0;
478 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
479 envp[env_offset++] = name_buf;
480 }
481
482 length = state_show(&edev->dev, NULL, prop_buf);
483 if (length > 0) {
484 if (prop_buf[length - 1] == '\n')
485 prop_buf[length - 1] = 0;
486 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
487 envp[env_offset++] = state_buf;
488 }
489 envp[env_offset] = NULL;
490
491 /* Unlock early before uevent */
492 spin_unlock_irqrestore(&edev->lock, flags);
493 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
494 free_page((unsigned long)prop_buf);
495
496 return 0;
497 }
498 EXPORT_SYMBOL_GPL(extcon_sync);
499
500 /**
501 * extcon_get_state() - Get the state of an external connector.
502 * @edev: the extcon device
503 * @id: the unique id indicating an external connector
504 *
505 * Returns 0 if success or error number if fail.
506 */
extcon_get_state(struct extcon_dev * edev,unsigned int id)507 int extcon_get_state(struct extcon_dev *edev, unsigned int id)
508 {
509 int index, state;
510 unsigned long flags;
511
512 if (!edev)
513 return -EINVAL;
514
515 index = find_cable_index_by_id(edev, id);
516 if (index < 0)
517 return index;
518
519 spin_lock_irqsave(&edev->lock, flags);
520 state = is_extcon_attached(edev, index);
521 spin_unlock_irqrestore(&edev->lock, flags);
522
523 return state;
524 }
525 EXPORT_SYMBOL_GPL(extcon_get_state);
526
527 /**
528 * extcon_set_state() - Set the state of an external connector.
529 * @edev: the extcon device
530 * @id: the unique id indicating an external connector
531 * @state: the new state of an external connector.
532 * the default semantics is true: attached / false: detached.
533 *
534 * Note that this function set the state of an external connector without
535 * a notification. To synchronize the state of an external connector,
536 * have to use extcon_set_state_sync() and extcon_sync().
537 *
538 * Returns 0 if success or error number if fail.
539 */
extcon_set_state(struct extcon_dev * edev,unsigned int id,bool state)540 int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
541 {
542 unsigned long flags;
543 int index, ret = 0;
544
545 if (!edev)
546 return -EINVAL;
547
548 index = find_cable_index_by_id(edev, id);
549 if (index < 0)
550 return index;
551
552 spin_lock_irqsave(&edev->lock, flags);
553
554 /* Check whether the external connector's state is changed. */
555 if (!is_extcon_changed(edev, index, state))
556 goto out;
557
558 if (check_mutually_exclusive(edev,
559 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
560 ret = -EPERM;
561 goto out;
562 }
563
564 /*
565 * Initialize the value of extcon property before setting
566 * the detached state for an external connector.
567 */
568 if (!state)
569 init_property(edev, id, index);
570
571 /* Update the state for an external connector. */
572 if (state)
573 edev->state |= BIT(index);
574 else
575 edev->state &= ~(BIT(index));
576 out:
577 spin_unlock_irqrestore(&edev->lock, flags);
578
579 return ret;
580 }
581 EXPORT_SYMBOL_GPL(extcon_set_state);
582
583 /**
584 * extcon_set_state_sync() - Set the state of an external connector with sync.
585 * @edev: the extcon device
586 * @id: the unique id indicating an external connector
587 * @state: the new state of external connector.
588 * the default semantics is true: attached / false: detached.
589 *
590 * Note that this function set the state of external connector
591 * and synchronize the state by sending a notification.
592 *
593 * Returns 0 if success or error number if fail.
594 */
extcon_set_state_sync(struct extcon_dev * edev,unsigned int id,bool state)595 int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
596 {
597 int ret, index;
598 unsigned long flags;
599
600 index = find_cable_index_by_id(edev, id);
601 if (index < 0)
602 return index;
603
604 /* Check whether the external connector's state is changed. */
605 spin_lock_irqsave(&edev->lock, flags);
606 ret = is_extcon_changed(edev, index, state);
607 spin_unlock_irqrestore(&edev->lock, flags);
608 if (!ret)
609 return 0;
610
611 ret = extcon_set_state(edev, id, state);
612 if (ret < 0)
613 return ret;
614
615 return extcon_sync(edev, id);
616 }
617 EXPORT_SYMBOL_GPL(extcon_set_state_sync);
618
619 /**
620 * extcon_get_property() - Get the property value of an external connector.
621 * @edev: the extcon device
622 * @id: the unique id indicating an external connector
623 * @prop: the property id indicating an extcon property
624 * @prop_val: the pointer which store the value of extcon property
625 *
626 * Note that when getting the property value of external connector,
627 * the external connector should be attached. If detached state, function
628 * return 0 without property value. Also, the each property should be
629 * included in the list of supported properties according to extcon type.
630 *
631 * Returns 0 if success or error number if fail.
632 */
extcon_get_property(struct extcon_dev * edev,unsigned int id,unsigned int prop,union extcon_property_value * prop_val)633 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
634 unsigned int prop,
635 union extcon_property_value *prop_val)
636 {
637 struct extcon_cable *cable;
638 unsigned long flags;
639 int index, ret = 0;
640
641 *prop_val = (union extcon_property_value){0};
642
643 if (!edev)
644 return -EINVAL;
645
646 /* Check whether the property is supported or not */
647 if (!is_extcon_property_supported(id, prop))
648 return -EINVAL;
649
650 /* Find the cable index of external connector by using id */
651 index = find_cable_index_by_id(edev, id);
652 if (index < 0)
653 return index;
654
655 spin_lock_irqsave(&edev->lock, flags);
656
657 /* Check whether the property is available or not. */
658 if (!is_extcon_property_capability(edev, id, index, prop)) {
659 spin_unlock_irqrestore(&edev->lock, flags);
660 return -EPERM;
661 }
662
663 /*
664 * Check whether the external connector is attached.
665 * If external connector is detached, the user can not
666 * get the property value.
667 */
668 if (!is_extcon_attached(edev, index)) {
669 spin_unlock_irqrestore(&edev->lock, flags);
670 return 0;
671 }
672
673 cable = &edev->cables[index];
674
675 /* Get the property value according to extcon type */
676 switch (prop) {
677 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
678 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
679 break;
680 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
681 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
682 break;
683 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
684 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
685 break;
686 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
687 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
688 break;
689 default:
690 ret = -EINVAL;
691 break;
692 }
693
694 spin_unlock_irqrestore(&edev->lock, flags);
695
696 return ret;
697 }
698 EXPORT_SYMBOL_GPL(extcon_get_property);
699
700 /**
701 * extcon_set_property() - Set the property value of an external connector.
702 * @edev: the extcon device
703 * @id: the unique id indicating an external connector
704 * @prop: the property id indicating an extcon property
705 * @prop_val: the pointer including the new value of extcon property
706 *
707 * Note that each property should be included in the list of supported
708 * properties according to the extcon type.
709 *
710 * Returns 0 if success or error number if fail.
711 */
extcon_set_property(struct extcon_dev * edev,unsigned int id,unsigned int prop,union extcon_property_value prop_val)712 int extcon_set_property(struct extcon_dev *edev, unsigned int id,
713 unsigned int prop,
714 union extcon_property_value prop_val)
715 {
716 struct extcon_cable *cable;
717 unsigned long flags;
718 int index, ret = 0;
719
720 if (!edev)
721 return -EINVAL;
722
723 /* Check whether the property is supported or not */
724 if (!is_extcon_property_supported(id, prop))
725 return -EINVAL;
726
727 /* Find the cable index of external connector by using id */
728 index = find_cable_index_by_id(edev, id);
729 if (index < 0)
730 return index;
731
732 spin_lock_irqsave(&edev->lock, flags);
733
734 /* Check whether the property is available or not. */
735 if (!is_extcon_property_capability(edev, id, index, prop)) {
736 spin_unlock_irqrestore(&edev->lock, flags);
737 return -EPERM;
738 }
739
740 cable = &edev->cables[index];
741
742 /* Set the property value according to extcon type */
743 switch (prop) {
744 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
745 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
746 break;
747 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
748 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
749 break;
750 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
751 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
752 break;
753 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
754 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
755 break;
756 default:
757 ret = -EINVAL;
758 break;
759 }
760
761 spin_unlock_irqrestore(&edev->lock, flags);
762
763 return ret;
764 }
765 EXPORT_SYMBOL_GPL(extcon_set_property);
766
767 /**
768 * extcon_set_property_sync() - Set property of an external connector with sync.
769 * @prop_val: the pointer including the new value of extcon property
770 *
771 * Note that when setting the property value of external connector,
772 * the external connector should be attached. The each property should
773 * be included in the list of supported properties according to extcon type.
774 *
775 * Returns 0 if success or error number if fail.
776 */
extcon_set_property_sync(struct extcon_dev * edev,unsigned int id,unsigned int prop,union extcon_property_value prop_val)777 int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
778 unsigned int prop,
779 union extcon_property_value prop_val)
780 {
781 int ret;
782
783 ret = extcon_set_property(edev, id, prop, prop_val);
784 if (ret < 0)
785 return ret;
786
787 return extcon_sync(edev, id);
788 }
789 EXPORT_SYMBOL_GPL(extcon_set_property_sync);
790
791 /**
792 * extcon_get_property_capability() - Get the capability of the property
793 * for an external connector.
794 * @edev: the extcon device
795 * @id: the unique id indicating an external connector
796 * @prop: the property id indicating an extcon property
797 *
798 * Returns 1 if the property is available or 0 if not available.
799 */
extcon_get_property_capability(struct extcon_dev * edev,unsigned int id,unsigned int prop)800 int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
801 unsigned int prop)
802 {
803 int index;
804
805 if (!edev)
806 return -EINVAL;
807
808 /* Check whether the property is supported or not */
809 if (!is_extcon_property_supported(id, prop))
810 return -EINVAL;
811
812 /* Find the cable index of external connector by using id */
813 index = find_cable_index_by_id(edev, id);
814 if (index < 0)
815 return index;
816
817 return is_extcon_property_capability(edev, id, index, prop);
818 }
819 EXPORT_SYMBOL_GPL(extcon_get_property_capability);
820
821 /**
822 * extcon_set_property_capability() - Set the capability of the property
823 * for an external connector.
824 * @edev: the extcon device
825 * @id: the unique id indicating an external connector
826 * @prop: the property id indicating an extcon property
827 *
828 * Note that this function set the capability of the property
829 * for an external connector in order to mark the bit in capability
830 * bitmap which mean the available state of the property.
831 *
832 * Returns 0 if success or error number if fail.
833 */
extcon_set_property_capability(struct extcon_dev * edev,unsigned int id,unsigned int prop)834 int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
835 unsigned int prop)
836 {
837 struct extcon_cable *cable;
838 int index, type, ret = 0;
839
840 if (!edev)
841 return -EINVAL;
842
843 /* Check whether the property is supported or not. */
844 if (!is_extcon_property_supported(id, prop))
845 return -EINVAL;
846
847 /* Find the cable index of external connector by using id. */
848 index = find_cable_index_by_id(edev, id);
849 if (index < 0)
850 return index;
851
852 type = get_extcon_type(prop);
853 if (type < 0)
854 return type;
855
856 cable = &edev->cables[index];
857
858 switch (type) {
859 case EXTCON_TYPE_USB:
860 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
861 break;
862 case EXTCON_TYPE_CHG:
863 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
864 break;
865 case EXTCON_TYPE_JACK:
866 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
867 break;
868 case EXTCON_TYPE_DISP:
869 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
870 break;
871 default:
872 ret = -EINVAL;
873 }
874
875 return ret;
876 }
877 EXPORT_SYMBOL_GPL(extcon_set_property_capability);
878
879 /**
880 * extcon_get_extcon_dev() - Get the extcon device instance from the name.
881 * @extcon_name: the extcon name provided with extcon_dev_register()
882 *
883 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
884 * NOTE: This function returns -EPROBE_DEFER so it may only be called from
885 * probe() functions.
886 */
extcon_get_extcon_dev(const char * extcon_name)887 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
888 {
889 struct extcon_dev *sd;
890
891 if (!extcon_name)
892 return ERR_PTR(-EINVAL);
893
894 mutex_lock(&extcon_dev_list_lock);
895 list_for_each_entry(sd, &extcon_dev_list, entry) {
896 if (!strcmp(sd->name, extcon_name))
897 goto out;
898 }
899 sd = ERR_PTR(-EPROBE_DEFER);
900 out:
901 mutex_unlock(&extcon_dev_list_lock);
902 return sd;
903 }
904 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
905
906 /**
907 * extcon_register_notifier() - Register a notifier block to get notified by
908 * any state changes from the extcon.
909 * @edev: the extcon device
910 * @id: the unique id indicating an external connector
911 * @nb: a notifier block to be registered
912 *
913 * Note that the second parameter given to the callback of nb (val) is
914 * the current state of an external connector and the third pameter
915 * is the pointer of extcon device.
916 *
917 * Returns 0 if success or error number if fail.
918 */
extcon_register_notifier(struct extcon_dev * edev,unsigned int id,struct notifier_block * nb)919 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
920 struct notifier_block *nb)
921 {
922 unsigned long flags;
923 int ret, idx;
924
925 if (!edev || !nb)
926 return -EINVAL;
927
928 idx = find_cable_index_by_id(edev, id);
929 if (idx < 0)
930 return idx;
931
932 spin_lock_irqsave(&edev->lock, flags);
933 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
934 spin_unlock_irqrestore(&edev->lock, flags);
935
936 return ret;
937 }
938 EXPORT_SYMBOL_GPL(extcon_register_notifier);
939
940 /**
941 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
942 * @edev: the extcon device
943 * @id: the unique id indicating an external connector
944 * @nb: a notifier block to be registered
945 *
946 * Returns 0 if success or error number if fail.
947 */
extcon_unregister_notifier(struct extcon_dev * edev,unsigned int id,struct notifier_block * nb)948 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
949 struct notifier_block *nb)
950 {
951 unsigned long flags;
952 int ret, idx;
953
954 if (!edev || !nb)
955 return -EINVAL;
956
957 idx = find_cable_index_by_id(edev, id);
958 if (idx < 0)
959 return idx;
960
961 spin_lock_irqsave(&edev->lock, flags);
962 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
963 spin_unlock_irqrestore(&edev->lock, flags);
964
965 return ret;
966 }
967 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
968
969 /**
970 * extcon_register_notifier_all() - Register a notifier block for all connectors.
971 * @edev: the extcon device
972 * @nb: a notifier block to be registered
973 *
974 * Note that this function registers a notifier block in order to receive
975 * the state change of all supported external connectors from extcon device.
976 * And the second parameter given to the callback of nb (val) is
977 * the current state and the third pameter is the pointer of extcon device.
978 *
979 * Returns 0 if success or error number if fail.
980 */
extcon_register_notifier_all(struct extcon_dev * edev,struct notifier_block * nb)981 int extcon_register_notifier_all(struct extcon_dev *edev,
982 struct notifier_block *nb)
983 {
984 unsigned long flags;
985 int ret;
986
987 if (!edev || !nb)
988 return -EINVAL;
989
990 spin_lock_irqsave(&edev->lock, flags);
991 ret = raw_notifier_chain_register(&edev->nh_all, nb);
992 spin_unlock_irqrestore(&edev->lock, flags);
993
994 return ret;
995 }
996 EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
997
998 /**
999 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
1000 * @edev: the extcon device
1001 * @nb: a notifier block to be registered
1002 *
1003 * Returns 0 if success or error number if fail.
1004 */
extcon_unregister_notifier_all(struct extcon_dev * edev,struct notifier_block * nb)1005 int extcon_unregister_notifier_all(struct extcon_dev *edev,
1006 struct notifier_block *nb)
1007 {
1008 unsigned long flags;
1009 int ret;
1010
1011 if (!edev || !nb)
1012 return -EINVAL;
1013
1014 spin_lock_irqsave(&edev->lock, flags);
1015 ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
1016 spin_unlock_irqrestore(&edev->lock, flags);
1017
1018 return ret;
1019 }
1020 EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1021
1022 static struct attribute *extcon_attrs[] = {
1023 &dev_attr_state.attr,
1024 &dev_attr_name.attr,
1025 NULL,
1026 };
1027 ATTRIBUTE_GROUPS(extcon);
1028
create_extcon_class(void)1029 static int create_extcon_class(void)
1030 {
1031 if (!extcon_class) {
1032 extcon_class = class_create(THIS_MODULE, "extcon");
1033 if (IS_ERR(extcon_class))
1034 return PTR_ERR(extcon_class);
1035 extcon_class->dev_groups = extcon_groups;
1036 }
1037
1038 return 0;
1039 }
1040
extcon_dev_release(struct device * dev)1041 static void extcon_dev_release(struct device *dev)
1042 {
1043 }
1044
1045 static const char *muex_name = "mutually_exclusive";
dummy_sysfs_dev_release(struct device * dev)1046 static void dummy_sysfs_dev_release(struct device *dev)
1047 {
1048 }
1049
1050 /*
1051 * extcon_dev_allocate() - Allocate the memory of extcon device.
1052 * @supported_cable: the array of the supported external connectors
1053 * ending with EXTCON_NONE.
1054 *
1055 * Note that this function allocates the memory for extcon device
1056 * and initialize default setting for the extcon device.
1057 *
1058 * Returns the pointer memory of allocated extcon_dev if success
1059 * or ERR_PTR(err) if fail.
1060 */
extcon_dev_allocate(const unsigned int * supported_cable)1061 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1062 {
1063 struct extcon_dev *edev;
1064
1065 if (!supported_cable)
1066 return ERR_PTR(-EINVAL);
1067
1068 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1069 if (!edev)
1070 return ERR_PTR(-ENOMEM);
1071
1072 edev->max_supported = 0;
1073 edev->supported_cable = supported_cable;
1074
1075 return edev;
1076 }
1077
1078 /*
1079 * extcon_dev_free() - Free the memory of extcon device.
1080 * @edev: the extcon device
1081 */
extcon_dev_free(struct extcon_dev * edev)1082 void extcon_dev_free(struct extcon_dev *edev)
1083 {
1084 kfree(edev);
1085 }
1086 EXPORT_SYMBOL_GPL(extcon_dev_free);
1087
1088 /**
1089 * extcon_dev_register() - Register an new extcon device
1090 * @edev: the extcon device to be registered
1091 *
1092 * Among the members of edev struct, please set the "user initializing data"
1093 * do not set the values of "internal data", which are initialized by
1094 * this function.
1095 *
1096 * Note that before calling this funciton, have to allocate the memory
1097 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1098 * dev should include the supported_cable information.
1099 *
1100 * Returns 0 if success or error number if fail.
1101 */
extcon_dev_register(struct extcon_dev * edev)1102 int extcon_dev_register(struct extcon_dev *edev)
1103 {
1104 int ret, index = 0;
1105 static atomic_t edev_no = ATOMIC_INIT(-1);
1106
1107 if (!extcon_class) {
1108 ret = create_extcon_class();
1109 if (ret < 0)
1110 return ret;
1111 }
1112
1113 if (!edev || !edev->supported_cable)
1114 return -EINVAL;
1115
1116 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1117
1118 edev->max_supported = index;
1119 if (index > SUPPORTED_CABLE_MAX) {
1120 dev_err(&edev->dev,
1121 "exceed the maximum number of supported cables\n");
1122 return -EINVAL;
1123 }
1124
1125 edev->dev.class = extcon_class;
1126 edev->dev.release = extcon_dev_release;
1127
1128 edev->name = dev_name(edev->dev.parent);
1129 if (IS_ERR_OR_NULL(edev->name)) {
1130 dev_err(&edev->dev,
1131 "extcon device name is null\n");
1132 return -EINVAL;
1133 }
1134 dev_set_name(&edev->dev, "extcon%lu",
1135 (unsigned long)atomic_inc_return(&edev_no));
1136
1137 if (edev->max_supported) {
1138 char *str;
1139 struct extcon_cable *cable;
1140
1141 edev->cables = kcalloc(edev->max_supported,
1142 sizeof(struct extcon_cable),
1143 GFP_KERNEL);
1144 if (!edev->cables) {
1145 ret = -ENOMEM;
1146 goto err_sysfs_alloc;
1147 }
1148 for (index = 0; index < edev->max_supported; index++) {
1149 cable = &edev->cables[index];
1150
1151 str = kasprintf(GFP_KERNEL, "cable.%d", index);
1152 if (!str) {
1153 for (index--; index >= 0; index--) {
1154 cable = &edev->cables[index];
1155 kfree(cable->attr_g.name);
1156 }
1157 ret = -ENOMEM;
1158
1159 goto err_alloc_cables;
1160 }
1161
1162 cable->edev = edev;
1163 cable->cable_index = index;
1164 cable->attrs[0] = &cable->attr_name.attr;
1165 cable->attrs[1] = &cable->attr_state.attr;
1166 cable->attrs[2] = NULL;
1167 cable->attr_g.name = str;
1168 cable->attr_g.attrs = cable->attrs;
1169
1170 sysfs_attr_init(&cable->attr_name.attr);
1171 cable->attr_name.attr.name = "name";
1172 cable->attr_name.attr.mode = 0444;
1173 cable->attr_name.show = cable_name_show;
1174
1175 sysfs_attr_init(&cable->attr_state.attr);
1176 cable->attr_state.attr.name = "state";
1177 cable->attr_state.attr.mode = 0444;
1178 cable->attr_state.show = cable_state_show;
1179 }
1180 }
1181
1182 if (edev->max_supported && edev->mutually_exclusive) {
1183 char *name;
1184
1185 /* Count the size of mutually_exclusive array */
1186 for (index = 0; edev->mutually_exclusive[index]; index++)
1187 ;
1188
1189 edev->attrs_muex = kcalloc(index + 1,
1190 sizeof(struct attribute *),
1191 GFP_KERNEL);
1192 if (!edev->attrs_muex) {
1193 ret = -ENOMEM;
1194 goto err_muex;
1195 }
1196
1197 edev->d_attrs_muex = kcalloc(index,
1198 sizeof(struct device_attribute),
1199 GFP_KERNEL);
1200 if (!edev->d_attrs_muex) {
1201 ret = -ENOMEM;
1202 kfree(edev->attrs_muex);
1203 goto err_muex;
1204 }
1205
1206 for (index = 0; edev->mutually_exclusive[index]; index++) {
1207 name = kasprintf(GFP_KERNEL, "0x%x",
1208 edev->mutually_exclusive[index]);
1209 if (!name) {
1210 for (index--; index >= 0; index--) {
1211 kfree(edev->d_attrs_muex[index].attr.
1212 name);
1213 }
1214 kfree(edev->d_attrs_muex);
1215 kfree(edev->attrs_muex);
1216 ret = -ENOMEM;
1217 goto err_muex;
1218 }
1219 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1220 edev->d_attrs_muex[index].attr.name = name;
1221 edev->d_attrs_muex[index].attr.mode = 0000;
1222 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1223 .attr;
1224 }
1225 edev->attr_g_muex.name = muex_name;
1226 edev->attr_g_muex.attrs = edev->attrs_muex;
1227
1228 }
1229
1230 if (edev->max_supported) {
1231 edev->extcon_dev_type.groups =
1232 kcalloc(edev->max_supported + 2,
1233 sizeof(struct attribute_group *),
1234 GFP_KERNEL);
1235 if (!edev->extcon_dev_type.groups) {
1236 ret = -ENOMEM;
1237 goto err_alloc_groups;
1238 }
1239
1240 edev->extcon_dev_type.name = dev_name(&edev->dev);
1241 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1242
1243 for (index = 0; index < edev->max_supported; index++)
1244 edev->extcon_dev_type.groups[index] =
1245 &edev->cables[index].attr_g;
1246 if (edev->mutually_exclusive)
1247 edev->extcon_dev_type.groups[index] =
1248 &edev->attr_g_muex;
1249
1250 edev->dev.type = &edev->extcon_dev_type;
1251 }
1252
1253 spin_lock_init(&edev->lock);
1254 if (edev->max_supported) {
1255 edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh),
1256 GFP_KERNEL);
1257 if (!edev->nh) {
1258 ret = -ENOMEM;
1259 goto err_alloc_nh;
1260 }
1261 }
1262
1263 for (index = 0; index < edev->max_supported; index++)
1264 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1265
1266 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1267
1268 dev_set_drvdata(&edev->dev, edev);
1269 edev->state = 0;
1270
1271 ret = device_register(&edev->dev);
1272 if (ret) {
1273 put_device(&edev->dev);
1274 goto err_dev;
1275 }
1276
1277 mutex_lock(&extcon_dev_list_lock);
1278 list_add(&edev->entry, &extcon_dev_list);
1279 mutex_unlock(&extcon_dev_list_lock);
1280
1281 return 0;
1282
1283 err_dev:
1284 if (edev->max_supported)
1285 kfree(edev->nh);
1286 err_alloc_nh:
1287 if (edev->max_supported)
1288 kfree(edev->extcon_dev_type.groups);
1289 err_alloc_groups:
1290 if (edev->max_supported && edev->mutually_exclusive) {
1291 for (index = 0; edev->mutually_exclusive[index]; index++)
1292 kfree(edev->d_attrs_muex[index].attr.name);
1293 kfree(edev->d_attrs_muex);
1294 kfree(edev->attrs_muex);
1295 }
1296 err_muex:
1297 for (index = 0; index < edev->max_supported; index++)
1298 kfree(edev->cables[index].attr_g.name);
1299 err_alloc_cables:
1300 if (edev->max_supported)
1301 kfree(edev->cables);
1302 err_sysfs_alloc:
1303 return ret;
1304 }
1305 EXPORT_SYMBOL_GPL(extcon_dev_register);
1306
1307 /**
1308 * extcon_dev_unregister() - Unregister the extcon device.
1309 * @edev: the extcon device to be unregistered.
1310 *
1311 * Note that this does not call kfree(edev) because edev was not allocated
1312 * by this class.
1313 */
extcon_dev_unregister(struct extcon_dev * edev)1314 void extcon_dev_unregister(struct extcon_dev *edev)
1315 {
1316 int index;
1317
1318 if (!edev)
1319 return;
1320
1321 mutex_lock(&extcon_dev_list_lock);
1322 list_del(&edev->entry);
1323 mutex_unlock(&extcon_dev_list_lock);
1324
1325 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1326 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1327 dev_name(&edev->dev));
1328 return;
1329 }
1330
1331 device_unregister(&edev->dev);
1332
1333 if (edev->mutually_exclusive && edev->max_supported) {
1334 for (index = 0; edev->mutually_exclusive[index];
1335 index++)
1336 kfree(edev->d_attrs_muex[index].attr.name);
1337 kfree(edev->d_attrs_muex);
1338 kfree(edev->attrs_muex);
1339 }
1340
1341 for (index = 0; index < edev->max_supported; index++)
1342 kfree(edev->cables[index].attr_g.name);
1343
1344 if (edev->max_supported) {
1345 kfree(edev->extcon_dev_type.groups);
1346 kfree(edev->cables);
1347 kfree(edev->nh);
1348 }
1349
1350 put_device(&edev->dev);
1351 }
1352 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1353
1354 #ifdef CONFIG_OF
1355
1356 /*
1357 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1358 * @node : OF node identifying edev
1359 *
1360 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1361 */
extcon_find_edev_by_node(struct device_node * node)1362 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1363 {
1364 struct extcon_dev *edev;
1365
1366 mutex_lock(&extcon_dev_list_lock);
1367 list_for_each_entry(edev, &extcon_dev_list, entry)
1368 if (edev->dev.parent && edev->dev.parent->of_node == node)
1369 goto out;
1370 edev = ERR_PTR(-EPROBE_DEFER);
1371 out:
1372 mutex_unlock(&extcon_dev_list_lock);
1373
1374 return edev;
1375 }
1376
1377 /*
1378 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1379 * @dev : the instance to the given device
1380 * @index : the index into list of extcon_dev
1381 *
1382 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1383 */
extcon_get_edev_by_phandle(struct device * dev,int index)1384 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1385 {
1386 struct device_node *node;
1387 struct extcon_dev *edev;
1388
1389 if (!dev)
1390 return ERR_PTR(-EINVAL);
1391
1392 if (!dev->of_node) {
1393 dev_dbg(dev, "device does not have a device node entry\n");
1394 return ERR_PTR(-EINVAL);
1395 }
1396
1397 node = of_parse_phandle(dev->of_node, "extcon", index);
1398 if (!node) {
1399 dev_dbg(dev, "failed to get phandle in %pOF node\n",
1400 dev->of_node);
1401 return ERR_PTR(-ENODEV);
1402 }
1403
1404 edev = extcon_find_edev_by_node(node);
1405 of_node_put(node);
1406
1407 return edev;
1408 }
1409
1410 #else
1411
extcon_find_edev_by_node(struct device_node * node)1412 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1413 {
1414 return ERR_PTR(-ENOSYS);
1415 }
1416
extcon_get_edev_by_phandle(struct device * dev,int index)1417 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1418 {
1419 return ERR_PTR(-ENOSYS);
1420 }
1421
1422 #endif /* CONFIG_OF */
1423
1424 EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1425 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1426
1427 /**
1428 * extcon_get_edev_name() - Get the name of the extcon device.
1429 * @edev: the extcon device
1430 */
extcon_get_edev_name(struct extcon_dev * edev)1431 const char *extcon_get_edev_name(struct extcon_dev *edev)
1432 {
1433 return !edev ? NULL : edev->name;
1434 }
1435 EXPORT_SYMBOL_GPL(extcon_get_edev_name);
1436
extcon_class_init(void)1437 static int __init extcon_class_init(void)
1438 {
1439 return create_extcon_class();
1440 }
1441 module_init(extcon_class_init);
1442
extcon_class_exit(void)1443 static void __exit extcon_class_exit(void)
1444 {
1445 class_destroy(extcon_class);
1446 }
1447 module_exit(extcon_class_exit);
1448
1449 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1450 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1451 MODULE_DESCRIPTION("External Connector (extcon) framework");
1452 MODULE_LICENSE("GPL v2");
1453