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md-cluster: Fix potential error pointer dereference in resize_bitmaps()
[linux/fpc-iii.git] / drivers / extcon / extcon.c
blobe055893fd5c393893d678e4e581e03721d3d9ba5
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 */
200 struct extcon_cable {
201 struct extcon_dev *edev;
202 int cable_index;
203
204 struct attribute_group attr_g;
205 struct device_attribute attr_name;
206 struct device_attribute attr_state;
207
208 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
209
210 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
211 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
212 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
213 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
214
215 unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
216 unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
217 unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
218 unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
219 };
220
221 static struct class *extcon_class;
222
223 static LIST_HEAD(extcon_dev_list);
224 static DEFINE_MUTEX(extcon_dev_list_lock);
225
226 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
227 {
228 int i = 0;
229
230 if (!edev->mutually_exclusive)
231 return 0;
232
233 for (i = 0; edev->mutually_exclusive[i]; i++) {
234 int weight;
235 u32 correspondants = new_state & edev->mutually_exclusive[i];
236
237 /* calculate the total number of bits set */
238 weight = hweight32(correspondants);
239 if (weight > 1)
240 return i + 1;
241 }
242
243 return 0;
244 }
245
246 static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
247 {
248 int i;
249
250 /* Find the the index of extcon cable in edev->supported_cable */
251 for (i = 0; i < edev->max_supported; i++) {
252 if (edev->supported_cable[i] == id)
253 return i;
254 }
255
256 return -EINVAL;
257 }
258
259 static int get_extcon_type(unsigned int prop)
260 {
261 switch (prop) {
262 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
263 return EXTCON_TYPE_USB;
264 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
265 return EXTCON_TYPE_CHG;
266 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
267 return EXTCON_TYPE_JACK;
268 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
269 return EXTCON_TYPE_DISP;
270 default:
271 return -EINVAL;
272 }
273 }
274
275 static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
276 {
277 return !!(edev->state & BIT(index));
278 }
279
280 static bool is_extcon_changed(struct extcon_dev *edev, int index,
281 bool new_state)
282 {
283 int state = !!(edev->state & BIT(index));
284 return (state != new_state);
285 }
286
287 static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
288 {
289 int type;
290
291 /* Check whether the property is supported or not. */
292 type = get_extcon_type(prop);
293 if (type < 0)
294 return false;
295
296 /* Check whether a specific extcon id supports the property or not. */
297 return !!(extcon_info[id].type & type);
298 }
299
300 static int is_extcon_property_capability(struct extcon_dev *edev,
301 unsigned int id, int index,unsigned int prop)
302 {
303 struct extcon_cable *cable;
304 int type, ret;
305
306 /* Check whether the property is supported or not. */
307 type = get_extcon_type(prop);
308 if (type < 0)
309 return type;
310
311 cable = &edev->cables[index];
312
313 switch (type) {
314 case EXTCON_TYPE_USB:
315 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
316 break;
317 case EXTCON_TYPE_CHG:
318 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
319 break;
320 case EXTCON_TYPE_JACK:
321 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
322 break;
323 case EXTCON_TYPE_DISP:
324 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
325 break;
326 default:
327 ret = -EINVAL;
328 }
329
330 return ret;
331 }
332
333 static void init_property(struct extcon_dev *edev, unsigned int id, int index)
334 {
335 unsigned int type = extcon_info[id].type;
336 struct extcon_cable *cable = &edev->cables[index];
337
338 if (EXTCON_TYPE_USB & type)
339 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
340 if (EXTCON_TYPE_CHG & type)
341 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
342 if (EXTCON_TYPE_JACK & type)
343 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
344 if (EXTCON_TYPE_DISP & type)
345 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
346 }
347
348 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
349 char *buf)
350 {
351 int i, count = 0;
352 struct extcon_dev *edev = dev_get_drvdata(dev);
353
354 if (edev->max_supported == 0)
355 return sprintf(buf, "%u\n", edev->state);
356
357 for (i = 0; i < edev->max_supported; i++) {
358 count += sprintf(buf + count, "%s=%d\n",
359 extcon_info[edev->supported_cable[i]].name,
360 !!(edev->state & BIT(i)));
361 }
362
363 return count;
364 }
365 static DEVICE_ATTR_RO(state);
366
367 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
368 char *buf)
369 {
370 struct extcon_dev *edev = dev_get_drvdata(dev);
371
372 return sprintf(buf, "%s\n", edev->name);
373 }
374 static DEVICE_ATTR_RO(name);
375
376 static ssize_t cable_name_show(struct device *dev,
377 struct device_attribute *attr, char *buf)
378 {
379 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
380 attr_name);
381 int i = cable->cable_index;
382
383 return sprintf(buf, "%s\n",
384 extcon_info[cable->edev->supported_cable[i]].name);
385 }
386
387 static ssize_t cable_state_show(struct device *dev,
388 struct device_attribute *attr, char *buf)
389 {
390 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
391 attr_state);
392
393 int i = cable->cable_index;
394
395 return sprintf(buf, "%d\n",
396 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
397 }
398
399 /**
400 * extcon_sync() - Synchronize the state for an external connector.
401 * @edev: the extcon device
402 *
403 * Note that this function send a notification in order to synchronize
404 * the state and property of an external connector.
405 *
406 * Returns 0 if success or error number if fail.
407 */
408 int extcon_sync(struct extcon_dev *edev, unsigned int id)
409 {
410 char name_buf[120];
411 char state_buf[120];
412 char *prop_buf;
413 char *envp[3];
414 int env_offset = 0;
415 int length;
416 int index;
417 int state;
418 unsigned long flags;
419
420 if (!edev)
421 return -EINVAL;
422
423 index = find_cable_index_by_id(edev, id);
424 if (index < 0)
425 return index;
426
427 spin_lock_irqsave(&edev->lock, flags);
428 state = !!(edev->state & BIT(index));
429 spin_unlock_irqrestore(&edev->lock, flags);
430
431 /*
432 * Call functions in a raw notifier chain for the specific one
433 * external connector.
434 */
435 raw_notifier_call_chain(&edev->nh[index], state, edev);
436
437 /*
438 * Call functions in a raw notifier chain for the all supported
439 * external connectors.
440 */
441 raw_notifier_call_chain(&edev->nh_all, state, edev);
442
443 spin_lock_irqsave(&edev->lock, flags);
444 /* This could be in interrupt handler */
445 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
446 if (!prop_buf) {
447 /* Unlock early before uevent */
448 spin_unlock_irqrestore(&edev->lock, flags);
449
450 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
451 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
452
453 return -ENOMEM;
454 }
455
456 length = name_show(&edev->dev, NULL, prop_buf);
457 if (length > 0) {
458 if (prop_buf[length - 1] == '\n')
459 prop_buf[length - 1] = 0;
460 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
461 envp[env_offset++] = name_buf;
462 }
463
464 length = state_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(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
469 envp[env_offset++] = state_buf;
470 }
471 envp[env_offset] = NULL;
472
473 /* Unlock early before uevent */
474 spin_unlock_irqrestore(&edev->lock, flags);
475 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
476 free_page((unsigned long)prop_buf);
477
478 return 0;
479 }
480 EXPORT_SYMBOL_GPL(extcon_sync);
481
482 /**
483 * extcon_get_state() - Get the state of an external connector.
484 * @edev: the extcon device
485 * @id: the unique id indicating an external connector
486 *
487 * Returns 0 if success or error number if fail.
488 */
489 int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
490 {
491 int index, state;
492 unsigned long flags;
493
494 if (!edev)
495 return -EINVAL;
496
497 index = find_cable_index_by_id(edev, id);
498 if (index < 0)
499 return index;
500
501 spin_lock_irqsave(&edev->lock, flags);
502 state = is_extcon_attached(edev, index);
503 spin_unlock_irqrestore(&edev->lock, flags);
504
505 return state;
506 }
507 EXPORT_SYMBOL_GPL(extcon_get_state);
508
509 /**
510 * extcon_set_state() - Set the state of an external connector.
511 * @edev: the extcon device
512 * @id: the unique id indicating an external connector
513 * @state: the new state of an external connector.
514 * the default semantics is true: attached / false: detached.
515 *
516 * Note that this function set the state of an external connector without
517 * a notification. To synchronize the state of an external connector,
518 * have to use extcon_set_state_sync() and extcon_sync().
519 *
520 * Returns 0 if success or error number if fail.
521 */
522 int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
523 {
524 unsigned long flags;
525 int index, ret = 0;
526
527 if (!edev)
528 return -EINVAL;
529
530 index = find_cable_index_by_id(edev, id);
531 if (index < 0)
532 return index;
533
534 spin_lock_irqsave(&edev->lock, flags);
535
536 /* Check whether the external connector's state is changed. */
537 if (!is_extcon_changed(edev, index, state))
538 goto out;
539
540 if (check_mutually_exclusive(edev,
541 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
542 ret = -EPERM;
543 goto out;
544 }
545
546 /*
547 * Initialize the value of extcon property before setting
548 * the detached state for an external connector.
549 */
550 if (!state)
551 init_property(edev, id, index);
552
553 /* Update the state for an external connector. */
554 if (state)
555 edev->state |= BIT(index);
556 else
557 edev->state &= ~(BIT(index));
558 out:
559 spin_unlock_irqrestore(&edev->lock, flags);
560
561 return ret;
562 }
563 EXPORT_SYMBOL_GPL(extcon_set_state);
564
565 /**
566 * extcon_set_state_sync() - Set the state of an external connector with sync.
567 * @edev: the extcon device
568 * @id: the unique id indicating an external connector
569 * @state: the new state of external connector.
570 * the default semantics is true: attached / false: detached.
571 *
572 * Note that this function set the state of external connector
573 * and synchronize the state by sending a notification.
574 *
575 * Returns 0 if success or error number if fail.
576 */
577 int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
578 {
579 int ret, index;
580 unsigned long flags;
581
582 index = find_cable_index_by_id(edev, id);
583 if (index < 0)
584 return index;
585
586 /* Check whether the external connector's state is changed. */
587 spin_lock_irqsave(&edev->lock, flags);
588 ret = is_extcon_changed(edev, index, state);
589 spin_unlock_irqrestore(&edev->lock, flags);
590 if (!ret)
591 return 0;
592
593 ret = extcon_set_state(edev, id, state);
594 if (ret < 0)
595 return ret;
596
597 return extcon_sync(edev, id);
598 }
599 EXPORT_SYMBOL_GPL(extcon_set_state_sync);
600
601 /**
602 * extcon_get_property() - Get the property value of an external connector.
603 * @edev: the extcon device
604 * @id: the unique id indicating an external connector
605 * @prop: the property id indicating an extcon property
606 * @prop_val: the pointer which store the value of extcon property
607 *
608 * Note that when getting the property value of external connector,
609 * the external connector should be attached. If detached state, function
610 * return 0 without property value. Also, the each property should be
611 * included in the list of supported properties according to extcon type.
612 *
613 * Returns 0 if success or error number if fail.
614 */
615 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
616 unsigned int prop,
617 union extcon_property_value *prop_val)
618 {
619 struct extcon_cable *cable;
620 unsigned long flags;
621 int index, ret = 0;
622
623 *prop_val = (union extcon_property_value){0};
624
625 if (!edev)
626 return -EINVAL;
627
628 /* Check whether the property is supported or not */
629 if (!is_extcon_property_supported(id, prop))
630 return -EINVAL;
631
632 /* Find the cable index of external connector by using id */
633 index = find_cable_index_by_id(edev, id);
634 if (index < 0)
635 return index;
636
637 spin_lock_irqsave(&edev->lock, flags);
638
639 /* Check whether the property is available or not. */
640 if (!is_extcon_property_capability(edev, id, index, prop)) {
641 spin_unlock_irqrestore(&edev->lock, flags);
642 return -EPERM;
643 }
644
645 /*
646 * Check whether the external connector is attached.
647 * If external connector is detached, the user can not
648 * get the property value.
649 */
650 if (!is_extcon_attached(edev, index)) {
651 spin_unlock_irqrestore(&edev->lock, flags);
652 return 0;
653 }
654
655 cable = &edev->cables[index];
656
657 /* Get the property value according to extcon type */
658 switch (prop) {
659 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
660 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
661 break;
662 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
663 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
664 break;
665 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
666 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
667 break;
668 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
669 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
670 break;
671 default:
672 ret = -EINVAL;
673 break;
674 }
675
676 spin_unlock_irqrestore(&edev->lock, flags);
677
678 return ret;
679 }
680 EXPORT_SYMBOL_GPL(extcon_get_property);
681
682 /**
683 * extcon_set_property() - Set the property value of an external connector.
684 * @edev: the extcon device
685 * @id: the unique id indicating an external connector
686 * @prop: the property id indicating an extcon property
687 * @prop_val: the pointer including the new value of extcon property
688 *
689 * Note that each property should be included in the list of supported
690 * properties according to the extcon type.
691 *
692 * Returns 0 if success or error number if fail.
693 */
694 int extcon_set_property(struct extcon_dev *edev, unsigned int id,
695 unsigned int prop,
696 union extcon_property_value prop_val)
697 {
698 struct extcon_cable *cable;
699 unsigned long flags;
700 int index, ret = 0;
701
702 if (!edev)
703 return -EINVAL;
704
705 /* Check whether the property is supported or not */
706 if (!is_extcon_property_supported(id, prop))
707 return -EINVAL;
708
709 /* Find the cable index of external connector by using id */
710 index = find_cable_index_by_id(edev, id);
711 if (index < 0)
712 return index;
713
714 spin_lock_irqsave(&edev->lock, flags);
715
716 /* Check whether the property is available or not. */
717 if (!is_extcon_property_capability(edev, id, index, prop)) {
718 spin_unlock_irqrestore(&edev->lock, flags);
719 return -EPERM;
720 }
721
722 cable = &edev->cables[index];
723
724 /* Set the property value according to extcon type */
725 switch (prop) {
726 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
727 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
728 break;
729 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
730 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
731 break;
732 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
733 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
734 break;
735 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
736 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
737 break;
738 default:
739 ret = -EINVAL;
740 break;
741 }
742
743 spin_unlock_irqrestore(&edev->lock, flags);
744
745 return ret;
746 }
747 EXPORT_SYMBOL_GPL(extcon_set_property);
748
749 /**
750 * extcon_set_property_sync() - Set property of an external connector with sync.
751 * @prop_val: the pointer including the new value of extcon property
752 *
753 * Note that when setting the property value of external connector,
754 * the external connector should be attached. The each property should
755 * be included in the list of supported properties according to extcon type.
756 *
757 * Returns 0 if success or error number if fail.
758 */
759 int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
760 unsigned int prop,
761 union extcon_property_value prop_val)
762 {
763 int ret;
764
765 ret = extcon_set_property(edev, id, prop, prop_val);
766 if (ret < 0)
767 return ret;
768
769 return extcon_sync(edev, id);
770 }
771 EXPORT_SYMBOL_GPL(extcon_set_property_sync);
772
773 /**
774 * extcon_get_property_capability() - Get the capability of the property
775 * for an external connector.
776 * @edev: the extcon device
777 * @id: the unique id indicating an external connector
778 * @prop: the property id indicating an extcon property
779 *
780 * Returns 1 if the property is available or 0 if not available.
781 */
782 int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
783 unsigned int prop)
784 {
785 int index;
786
787 if (!edev)
788 return -EINVAL;
789
790 /* Check whether the property is supported or not */
791 if (!is_extcon_property_supported(id, prop))
792 return -EINVAL;
793
794 /* Find the cable index of external connector by using id */
795 index = find_cable_index_by_id(edev, id);
796 if (index < 0)
797 return index;
798
799 return is_extcon_property_capability(edev, id, index, prop);
800 }
801 EXPORT_SYMBOL_GPL(extcon_get_property_capability);
802
803 /**
804 * extcon_set_property_capability() - Set the capability of the property
805 * for an external connector.
806 * @edev: the extcon device
807 * @id: the unique id indicating an external connector
808 * @prop: the property id indicating an extcon property
809 *
810 * Note that this function set the capability of the property
811 * for an external connector in order to mark the bit in capability
812 * bitmap which mean the available state of the property.
813 *
814 * Returns 0 if success or error number if fail.
815 */
816 int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
817 unsigned int prop)
818 {
819 struct extcon_cable *cable;
820 int index, type, ret = 0;
821
822 if (!edev)
823 return -EINVAL;
824
825 /* Check whether the property is supported or not. */
826 if (!is_extcon_property_supported(id, prop))
827 return -EINVAL;
828
829 /* Find the cable index of external connector by using id. */
830 index = find_cable_index_by_id(edev, id);
831 if (index < 0)
832 return index;
833
834 type = get_extcon_type(prop);
835 if (type < 0)
836 return type;
837
838 cable = &edev->cables[index];
839
840 switch (type) {
841 case EXTCON_TYPE_USB:
842 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
843 break;
844 case EXTCON_TYPE_CHG:
845 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
846 break;
847 case EXTCON_TYPE_JACK:
848 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
849 break;
850 case EXTCON_TYPE_DISP:
851 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
852 break;
853 default:
854 ret = -EINVAL;
855 }
856
857 return ret;
858 }
859 EXPORT_SYMBOL_GPL(extcon_set_property_capability);
860
861 /**
862 * extcon_get_extcon_dev() - Get the extcon device instance from the name.
863 * @extcon_name: the extcon name provided with extcon_dev_register()
864 *
865 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
866 */
867 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
868 {
869 struct extcon_dev *sd;
870
871 if (!extcon_name)
872 return ERR_PTR(-EINVAL);
873
874 mutex_lock(&extcon_dev_list_lock);
875 list_for_each_entry(sd, &extcon_dev_list, entry) {
876 if (!strcmp(sd->name, extcon_name))
877 goto out;
878 }
879 sd = NULL;
880 out:
881 mutex_unlock(&extcon_dev_list_lock);
882 return sd;
883 }
884 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
885
886 /**
887 * extcon_register_notifier() - Register a notifier block to get notified by
888 * any state changes from the extcon.
889 * @edev: the extcon device
890 * @id: the unique id indicating an external connector
891 * @nb: a notifier block to be registered
892 *
893 * Note that the second parameter given to the callback of nb (val) is
894 * the current state of an external connector and the third pameter
895 * is the pointer of extcon device.
896 *
897 * Returns 0 if success or error number if fail.
898 */
899 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
900 struct notifier_block *nb)
901 {
902 unsigned long flags;
903 int ret, idx = -EINVAL;
904
905 if (!edev || !nb)
906 return -EINVAL;
907
908 idx = find_cable_index_by_id(edev, id);
909 if (idx < 0)
910 return idx;
911
912 spin_lock_irqsave(&edev->lock, flags);
913 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
914 spin_unlock_irqrestore(&edev->lock, flags);
915
916 return ret;
917 }
918 EXPORT_SYMBOL_GPL(extcon_register_notifier);
919
920 /**
921 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
922 * @edev: the extcon device
923 * @id: the unique id indicating an external connector
924 * @nb: a notifier block to be registered
925 *
926 * Returns 0 if success or error number if fail.
927 */
928 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
929 struct notifier_block *nb)
930 {
931 unsigned long flags;
932 int ret, idx;
933
934 if (!edev || !nb)
935 return -EINVAL;
936
937 idx = find_cable_index_by_id(edev, id);
938 if (idx < 0)
939 return idx;
940
941 spin_lock_irqsave(&edev->lock, flags);
942 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
943 spin_unlock_irqrestore(&edev->lock, flags);
944
945 return ret;
946 }
947 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
948
949 /**
950 * extcon_register_notifier_all() - Register a notifier block for all connectors.
951 * @edev: the extcon device
952 * @nb: a notifier block to be registered
953 *
954 * Note that this function registers a notifier block in order to receive
955 * the state change of all supported external connectors from extcon device.
956 * And the second parameter given to the callback of nb (val) is
957 * the current state and the third pameter is the pointer of extcon device.
958 *
959 * Returns 0 if success or error number if fail.
960 */
961 int extcon_register_notifier_all(struct extcon_dev *edev,
962 struct notifier_block *nb)
963 {
964 unsigned long flags;
965 int ret;
966
967 if (!edev || !nb)
968 return -EINVAL;
969
970 spin_lock_irqsave(&edev->lock, flags);
971 ret = raw_notifier_chain_register(&edev->nh_all, nb);
972 spin_unlock_irqrestore(&edev->lock, flags);
973
974 return ret;
975 }
976 EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
977
978 /**
979 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
980 * @edev: the extcon device
981 * @nb: a notifier block to be registered
982 *
983 * Returns 0 if success or error number if fail.
984 */
985 int extcon_unregister_notifier_all(struct extcon_dev *edev,
986 struct notifier_block *nb)
987 {
988 unsigned long flags;
989 int ret;
990
991 if (!edev || !nb)
992 return -EINVAL;
993
994 spin_lock_irqsave(&edev->lock, flags);
995 ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
996 spin_unlock_irqrestore(&edev->lock, flags);
997
998 return ret;
999 }
1000 EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1001
1002 static struct attribute *extcon_attrs[] = {
1003 &dev_attr_state.attr,
1004 &dev_attr_name.attr,
1005 NULL,
1006 };
1007 ATTRIBUTE_GROUPS(extcon);
1008
1009 static int create_extcon_class(void)
1010 {
1011 if (!extcon_class) {
1012 extcon_class = class_create(THIS_MODULE, "extcon");
1013 if (IS_ERR(extcon_class))
1014 return PTR_ERR(extcon_class);
1015 extcon_class->dev_groups = extcon_groups;
1016 }
1017
1018 return 0;
1019 }
1020
1021 static void extcon_dev_release(struct device *dev)
1022 {
1023 }
1024
1025 static const char *muex_name = "mutually_exclusive";
1026 static void dummy_sysfs_dev_release(struct device *dev)
1027 {
1028 }
1029
1030 /*
1031 * extcon_dev_allocate() - Allocate the memory of extcon device.
1032 * @supported_cable: the array of the supported external connectors
1033 * ending with EXTCON_NONE.
1034 *
1035 * Note that this function allocates the memory for extcon device
1036 * and initialize default setting for the extcon device.
1037 *
1038 * Returns the pointer memory of allocated extcon_dev if success
1039 * or ERR_PTR(err) if fail.
1040 */
1041 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1042 {
1043 struct extcon_dev *edev;
1044
1045 if (!supported_cable)
1046 return ERR_PTR(-EINVAL);
1047
1048 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1049 if (!edev)
1050 return ERR_PTR(-ENOMEM);
1051
1052 edev->max_supported = 0;
1053 edev->supported_cable = supported_cable;
1054
1055 return edev;
1056 }
1057
1058 /*
1059 * extcon_dev_free() - Free the memory of extcon device.
1060 * @edev: the extcon device
1061 */
1062 void extcon_dev_free(struct extcon_dev *edev)
1063 {
1064 kfree(edev);
1065 }
1066 EXPORT_SYMBOL_GPL(extcon_dev_free);
1067
1068 /**
1069 * extcon_dev_register() - Register an new extcon device
1070 * @edev: the extcon device to be registered
1071 *
1072 * Among the members of edev struct, please set the "user initializing data"
1073 * do not set the values of "internal data", which are initialized by
1074 * this function.
1075 *
1076 * Note that before calling this funciton, have to allocate the memory
1077 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1078 * dev should include the supported_cable information.
1079 *
1080 * Returns 0 if success or error number if fail.
1081 */
1082 int extcon_dev_register(struct extcon_dev *edev)
1083 {
1084 int ret, index = 0;
1085 static atomic_t edev_no = ATOMIC_INIT(-1);
1086
1087 if (!extcon_class) {
1088 ret = create_extcon_class();
1089 if (ret < 0)
1090 return ret;
1091 }
1092
1093 if (!edev || !edev->supported_cable)
1094 return -EINVAL;
1095
1096 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1097
1098 edev->max_supported = index;
1099 if (index > SUPPORTED_CABLE_MAX) {
1100 dev_err(&edev->dev,
1101 "exceed the maximum number of supported cables\n");
1102 return -EINVAL;
1103 }
1104
1105 edev->dev.class = extcon_class;
1106 edev->dev.release = extcon_dev_release;
1107
1108 edev->name = dev_name(edev->dev.parent);
1109 if (IS_ERR_OR_NULL(edev->name)) {
1110 dev_err(&edev->dev,
1111 "extcon device name is null\n");
1112 return -EINVAL;
1113 }
1114 dev_set_name(&edev->dev, "extcon%lu",
1115 (unsigned long)atomic_inc_return(&edev_no));
1116
1117 if (edev->max_supported) {
1118 char *str;
1119 struct extcon_cable *cable;
1120
1121 edev->cables = kcalloc(edev->max_supported,
1122 sizeof(struct extcon_cable),
1123 GFP_KERNEL);
1124 if (!edev->cables) {
1125 ret = -ENOMEM;
1126 goto err_sysfs_alloc;
1127 }
1128 for (index = 0; index < edev->max_supported; index++) {
1129 cable = &edev->cables[index];
1130
1131 str = kasprintf(GFP_KERNEL, "cable.%d", index);
1132 if (!str) {
1133 for (index--; index >= 0; index--) {
1134 cable = &edev->cables[index];
1135 kfree(cable->attr_g.name);
1136 }
1137 ret = -ENOMEM;
1138
1139 goto err_alloc_cables;
1140 }
1141
1142 cable->edev = edev;
1143 cable->cable_index = index;
1144 cable->attrs[0] = &cable->attr_name.attr;
1145 cable->attrs[1] = &cable->attr_state.attr;
1146 cable->attrs[2] = NULL;
1147 cable->attr_g.name = str;
1148 cable->attr_g.attrs = cable->attrs;
1149
1150 sysfs_attr_init(&cable->attr_name.attr);
1151 cable->attr_name.attr.name = "name";
1152 cable->attr_name.attr.mode = 0444;
1153 cable->attr_name.show = cable_name_show;
1154
1155 sysfs_attr_init(&cable->attr_state.attr);
1156 cable->attr_state.attr.name = "state";
1157 cable->attr_state.attr.mode = 0444;
1158 cable->attr_state.show = cable_state_show;
1159 }
1160 }
1161
1162 if (edev->max_supported && edev->mutually_exclusive) {
1163 char *name;
1164
1165 /* Count the size of mutually_exclusive array */
1166 for (index = 0; edev->mutually_exclusive[index]; index++)
1167 ;
1168
1169 edev->attrs_muex = kcalloc(index + 1,
1170 sizeof(struct attribute *),
1171 GFP_KERNEL);
1172 if (!edev->attrs_muex) {
1173 ret = -ENOMEM;
1174 goto err_muex;
1175 }
1176
1177 edev->d_attrs_muex = kcalloc(index,
1178 sizeof(struct device_attribute),
1179 GFP_KERNEL);
1180 if (!edev->d_attrs_muex) {
1181 ret = -ENOMEM;
1182 kfree(edev->attrs_muex);
1183 goto err_muex;
1184 }
1185
1186 for (index = 0; edev->mutually_exclusive[index]; index++) {
1187 name = kasprintf(GFP_KERNEL, "0x%x",
1188 edev->mutually_exclusive[index]);
1189 if (!name) {
1190 for (index--; index >= 0; index--) {
1191 kfree(edev->d_attrs_muex[index].attr.
1192 name);
1193 }
1194 kfree(edev->d_attrs_muex);
1195 kfree(edev->attrs_muex);
1196 ret = -ENOMEM;
1197 goto err_muex;
1198 }
1199 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1200 edev->d_attrs_muex[index].attr.name = name;
1201 edev->d_attrs_muex[index].attr.mode = 0000;
1202 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1203 .attr;
1204 }
1205 edev->attr_g_muex.name = muex_name;
1206 edev->attr_g_muex.attrs = edev->attrs_muex;
1207
1208 }
1209
1210 if (edev->max_supported) {
1211 edev->extcon_dev_type.groups =
1212 kcalloc(edev->max_supported + 2,
1213 sizeof(struct attribute_group *),
1214 GFP_KERNEL);
1215 if (!edev->extcon_dev_type.groups) {
1216 ret = -ENOMEM;
1217 goto err_alloc_groups;
1218 }
1219
1220 edev->extcon_dev_type.name = dev_name(&edev->dev);
1221 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1222
1223 for (index = 0; index < edev->max_supported; index++)
1224 edev->extcon_dev_type.groups[index] =
1225 &edev->cables[index].attr_g;
1226 if (edev->mutually_exclusive)
1227 edev->extcon_dev_type.groups[index] =
1228 &edev->attr_g_muex;
1229
1230 edev->dev.type = &edev->extcon_dev_type;
1231 }
1232
1233 ret = device_register(&edev->dev);
1234 if (ret) {
1235 put_device(&edev->dev);
1236 goto err_dev;
1237 }
1238
1239 spin_lock_init(&edev->lock);
1240 edev->nh = devm_kcalloc(&edev->dev, edev->max_supported,
1241 sizeof(*edev->nh), GFP_KERNEL);
1242 if (!edev->nh) {
1243 ret = -ENOMEM;
1244 goto err_dev;
1245 }
1246
1247 for (index = 0; index < edev->max_supported; index++)
1248 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1249
1250 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1251
1252 dev_set_drvdata(&edev->dev, edev);
1253 edev->state = 0;
1254
1255 mutex_lock(&extcon_dev_list_lock);
1256 list_add(&edev->entry, &extcon_dev_list);
1257 mutex_unlock(&extcon_dev_list_lock);
1258
1259 return 0;
1260
1261 err_dev:
1262 if (edev->max_supported)
1263 kfree(edev->extcon_dev_type.groups);
1264 err_alloc_groups:
1265 if (edev->max_supported && edev->mutually_exclusive) {
1266 for (index = 0; edev->mutually_exclusive[index]; index++)
1267 kfree(edev->d_attrs_muex[index].attr.name);
1268 kfree(edev->d_attrs_muex);
1269 kfree(edev->attrs_muex);
1270 }
1271 err_muex:
1272 for (index = 0; index < edev->max_supported; index++)
1273 kfree(edev->cables[index].attr_g.name);
1274 err_alloc_cables:
1275 if (edev->max_supported)
1276 kfree(edev->cables);
1277 err_sysfs_alloc:
1278 return ret;
1279 }
1280 EXPORT_SYMBOL_GPL(extcon_dev_register);
1281
1282 /**
1283 * extcon_dev_unregister() - Unregister the extcon device.
1284 * @edev: the extcon device to be unregistered.
1285 *
1286 * Note that this does not call kfree(edev) because edev was not allocated
1287 * by this class.
1288 */
1289 void extcon_dev_unregister(struct extcon_dev *edev)
1290 {
1291 int index;
1292
1293 if (!edev)
1294 return;
1295
1296 mutex_lock(&extcon_dev_list_lock);
1297 list_del(&edev->entry);
1298 mutex_unlock(&extcon_dev_list_lock);
1299
1300 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1301 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1302 dev_name(&edev->dev));
1303 return;
1304 }
1305
1306 device_unregister(&edev->dev);
1307
1308 if (edev->mutually_exclusive && edev->max_supported) {
1309 for (index = 0; edev->mutually_exclusive[index];
1310 index++)
1311 kfree(edev->d_attrs_muex[index].attr.name);
1312 kfree(edev->d_attrs_muex);
1313 kfree(edev->attrs_muex);
1314 }
1315
1316 for (index = 0; index < edev->max_supported; index++)
1317 kfree(edev->cables[index].attr_g.name);
1318
1319 if (edev->max_supported) {
1320 kfree(edev->extcon_dev_type.groups);
1321 kfree(edev->cables);
1322 }
1323
1324 put_device(&edev->dev);
1325 }
1326 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1327
1328 #ifdef CONFIG_OF
1329
1330 /*
1331 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1332 * @node : OF node identifying edev
1333 *
1334 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1335 */
1336 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1337 {
1338 struct extcon_dev *edev;
1339
1340 mutex_lock(&extcon_dev_list_lock);
1341 list_for_each_entry(edev, &extcon_dev_list, entry)
1342 if (edev->dev.parent && edev->dev.parent->of_node == node)
1343 goto out;
1344 edev = ERR_PTR(-EPROBE_DEFER);
1345 out:
1346 mutex_unlock(&extcon_dev_list_lock);
1347
1348 return edev;
1349 }
1350
1351 /*
1352 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1353 * @dev : the instance to the given device
1354 * @index : the index into list of extcon_dev
1355 *
1356 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1357 */
1358 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1359 {
1360 struct device_node *node;
1361 struct extcon_dev *edev;
1362
1363 if (!dev)
1364 return ERR_PTR(-EINVAL);
1365
1366 if (!dev->of_node) {
1367 dev_dbg(dev, "device does not have a device node entry\n");
1368 return ERR_PTR(-EINVAL);
1369 }
1370
1371 node = of_parse_phandle(dev->of_node, "extcon", index);
1372 if (!node) {
1373 dev_dbg(dev, "failed to get phandle in %pOF node\n",
1374 dev->of_node);
1375 return ERR_PTR(-ENODEV);
1376 }
1377
1378 edev = extcon_find_edev_by_node(node);
1379 of_node_put(node);
1380
1381 return edev;
1382 }
1383
1384 #else
1385
1386 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1387 {
1388 return ERR_PTR(-ENOSYS);
1389 }
1390
1391 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1392 {
1393 return ERR_PTR(-ENOSYS);
1394 }
1395
1396 #endif /* CONFIG_OF */
1397
1398 EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1399 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1400
1401 /**
1402 * extcon_get_edev_name() - Get the name of the extcon device.
1403 * @edev: the extcon device
1404 */
1405 const char *extcon_get_edev_name(struct extcon_dev *edev)
1406 {
1407 return !edev ? NULL : edev->name;
1408 }
1409
1410 static int __init extcon_class_init(void)
1411 {
1412 return create_extcon_class();
1413 }
1414 module_init(extcon_class_init);
1415
1416 static void __exit extcon_class_exit(void)
1417 {
1418 class_destroy(extcon_class);
1419 }
1420 module_exit(extcon_class_exit);
1421
1422 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1423 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1424 MODULE_DESCRIPTION("External Connector (extcon) framework");
1425 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support