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hung_task: allow hung_task_panic when hung_task_warnings is 0
[deliverable/linux.git] / drivers / extcon / extcon.c
1 /*
2 * drivers/extcon/extcon.c - External Connector (extcon) framework.
3 *
4 * External connector (extcon) class driver
5 *
6 * Copyright (C) 2015 Samsung Electronics
7 * Author: Chanwoo Choi <cw00.choi@samsung.com>
8 *
9 * Copyright (C) 2012 Samsung Electronics
10 * Author: Donggeun Kim <dg77.kim@samsung.com>
11 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
12 *
13 * based on android/drivers/switch/switch_class.c
14 * Copyright (C) 2008 Google, Inc.
15 * Author: Mike Lockwood <lockwood@android.com>
16 *
17 * This software is licensed under the terms of the GNU General Public
18 * License version 2, as published by the Free Software Foundation, and
19 * may be copied, distributed, and modified under those terms.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 */
26
27 #include <linux/module.h>
28 #include <linux/types.h>
29 #include <linux/init.h>
30 #include <linux/device.h>
31 #include <linux/fs.h>
32 #include <linux/err.h>
33 #include <linux/extcon.h>
34 #include <linux/of.h>
35 #include <linux/slab.h>
36 #include <linux/sysfs.h>
37
38 #define SUPPORTED_CABLE_MAX 32
39 #define CABLE_NAME_MAX 30
40
41 struct __extcon_info {
42 unsigned int type;
43 unsigned int id;
44 const char *name;
45
46 } extcon_info[] = {
47 [EXTCON_NONE] = {
48 .type = EXTCON_TYPE_MISC,
49 .id = EXTCON_NONE,
50 .name = "NONE",
51 },
52
53 /* USB external connector */
54 [EXTCON_USB] = {
55 .type = EXTCON_TYPE_USB,
56 .id = EXTCON_USB,
57 .name = "USB",
58 },
59 [EXTCON_USB_HOST] = {
60 .type = EXTCON_TYPE_USB,
61 .id = EXTCON_USB_HOST,
62 .name = "USB_HOST",
63 },
64
65 /* Charging external connector */
66 [EXTCON_CHG_USB_SDP] = {
67 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
68 .id = EXTCON_CHG_USB_SDP,
69 .name = "SDP",
70 },
71 [EXTCON_CHG_USB_DCP] = {
72 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
73 .id = EXTCON_CHG_USB_DCP,
74 .name = "DCP",
75 },
76 [EXTCON_CHG_USB_CDP] = {
77 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
78 .id = EXTCON_CHG_USB_CDP,
79 .name = "CDP",
80 },
81 [EXTCON_CHG_USB_ACA] = {
82 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
83 .id = EXTCON_CHG_USB_ACA,
84 .name = "ACA",
85 },
86 [EXTCON_CHG_USB_FAST] = {
87 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
88 .id = EXTCON_CHG_USB_FAST,
89 .name = "FAST-CHARGER",
90 },
91 [EXTCON_CHG_USB_SLOW] = {
92 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
93 .id = EXTCON_CHG_USB_SLOW,
94 .name = "SLOW-CHARGER",
95 },
96 [EXTCON_CHG_WPT] = {
97 .type = EXTCON_TYPE_CHG,
98 .id = EXTCON_CHG_WPT,
99 .name = "WPT",
100 },
101
102 /* Jack external connector */
103 [EXTCON_JACK_MICROPHONE] = {
104 .type = EXTCON_TYPE_JACK,
105 .id = EXTCON_JACK_MICROPHONE,
106 .name = "MICROPHONE",
107 },
108 [EXTCON_JACK_HEADPHONE] = {
109 .type = EXTCON_TYPE_JACK,
110 .id = EXTCON_JACK_HEADPHONE,
111 .name = "HEADPHONE",
112 },
113 [EXTCON_JACK_LINE_IN] = {
114 .type = EXTCON_TYPE_JACK,
115 .id = EXTCON_JACK_LINE_IN,
116 .name = "LINE-IN",
117 },
118 [EXTCON_JACK_LINE_OUT] = {
119 .type = EXTCON_TYPE_JACK,
120 .id = EXTCON_JACK_LINE_OUT,
121 .name = "LINE-OUT",
122 },
123 [EXTCON_JACK_VIDEO_IN] = {
124 .type = EXTCON_TYPE_JACK,
125 .id = EXTCON_JACK_VIDEO_IN,
126 .name = "VIDEO-IN",
127 },
128 [EXTCON_JACK_VIDEO_OUT] = {
129 .type = EXTCON_TYPE_JACK,
130 .id = EXTCON_JACK_VIDEO_OUT,
131 .name = "VIDEO-OUT",
132 },
133 [EXTCON_JACK_SPDIF_IN] = {
134 .type = EXTCON_TYPE_JACK,
135 .id = EXTCON_JACK_SPDIF_IN,
136 .name = "SPDIF-IN",
137 },
138 [EXTCON_JACK_SPDIF_OUT] = {
139 .type = EXTCON_TYPE_JACK,
140 .id = EXTCON_JACK_SPDIF_OUT,
141 .name = "SPDIF-OUT",
142 },
143
144 /* Display external connector */
145 [EXTCON_DISP_HDMI] = {
146 .type = EXTCON_TYPE_DISP,
147 .id = EXTCON_DISP_HDMI,
148 .name = "HDMI",
149 },
150 [EXTCON_DISP_MHL] = {
151 .type = EXTCON_TYPE_DISP,
152 .id = EXTCON_DISP_MHL,
153 .name = "MHL",
154 },
155 [EXTCON_DISP_DVI] = {
156 .type = EXTCON_TYPE_DISP,
157 .id = EXTCON_DISP_DVI,
158 .name = "DVI",
159 },
160 [EXTCON_DISP_VGA] = {
161 .type = EXTCON_TYPE_DISP,
162 .id = EXTCON_DISP_VGA,
163 .name = "VGA",
164 },
165 [EXTCON_DISP_DP] = {
166 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
167 .id = EXTCON_DISP_DP,
168 .name = "DP",
169 },
170 [EXTCON_DISP_HMD] = {
171 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
172 .id = EXTCON_DISP_HMD,
173 .name = "HMD",
174 },
175
176 /* Miscellaneous external connector */
177 [EXTCON_DOCK] = {
178 .type = EXTCON_TYPE_MISC,
179 .id = EXTCON_DOCK,
180 .name = "DOCK",
181 },
182 [EXTCON_JIG] = {
183 .type = EXTCON_TYPE_MISC,
184 .id = EXTCON_JIG,
185 .name = "JIG",
186 },
187 [EXTCON_MECHANICAL] = {
188 .type = EXTCON_TYPE_MISC,
189 .id = EXTCON_MECHANICAL,
190 .name = "MECHANICAL",
191 },
192
193 { /* sentinel */ }
194 };
195
196 /**
197 * struct extcon_cable - An internal data for each cable of extcon device.
198 * @edev: The extcon device
199 * @cable_index: Index of this cable in the edev
200 * @attr_g: Attribute group for the cable
201 * @attr_name: "name" sysfs entry
202 * @attr_state: "state" sysfs entry
203 * @attrs: Array pointing to attr_name and attr_state for attr_g
204 */
205 struct extcon_cable {
206 struct extcon_dev *edev;
207 int cable_index;
208
209 struct attribute_group attr_g;
210 struct device_attribute attr_name;
211 struct device_attribute attr_state;
212
213 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
214
215 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
216 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
217 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
218 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
219
220 unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
221 unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
222 unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
223 unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
224 };
225
226 static struct class *extcon_class;
227 #if defined(CONFIG_ANDROID)
228 static struct class_compat *switch_class;
229 #endif /* CONFIG_ANDROID */
230
231 static LIST_HEAD(extcon_dev_list);
232 static DEFINE_MUTEX(extcon_dev_list_lock);
233
234 /**
235 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
236 * condition.
237 * @edev: the extcon device
238 * @new_state: new cable attach status for @edev
239 *
240 * Returns 0 if nothing violates. Returns the index + 1 for the first
241 * violated condition.
242 */
243 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
244 {
245 int i = 0;
246
247 if (!edev->mutually_exclusive)
248 return 0;
249
250 for (i = 0; edev->mutually_exclusive[i]; i++) {
251 int weight;
252 u32 correspondants = new_state & edev->mutually_exclusive[i];
253
254 /* calculate the total number of bits set */
255 weight = hweight32(correspondants);
256 if (weight > 1)
257 return i + 1;
258 }
259
260 return 0;
261 }
262
263 static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
264 {
265 int i;
266
267 /* Find the the index of extcon cable in edev->supported_cable */
268 for (i = 0; i < edev->max_supported; i++) {
269 if (edev->supported_cable[i] == id)
270 return i;
271 }
272
273 return -EINVAL;
274 }
275
276 static int get_extcon_type(unsigned int prop)
277 {
278 switch (prop) {
279 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
280 return EXTCON_TYPE_USB;
281 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
282 return EXTCON_TYPE_CHG;
283 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
284 return EXTCON_TYPE_JACK;
285 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
286 return EXTCON_TYPE_DISP;
287 default:
288 return -EINVAL;
289 }
290 }
291
292 static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
293 {
294 return !!(edev->state & BIT(index));
295 }
296
297 static bool is_extcon_changed(struct extcon_dev *edev, int index,
298 bool new_state)
299 {
300 int state = !!(edev->state & BIT(index));
301 return (state != new_state);
302 }
303
304 static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
305 {
306 int type;
307
308 /* Check whether the property is supported or not. */
309 type = get_extcon_type(prop);
310 if (type < 0)
311 return false;
312
313 /* Check whether a specific extcon id supports the property or not. */
314 return !!(extcon_info[id].type & type);
315 }
316
317 static int is_extcon_property_capability(struct extcon_dev *edev,
318 unsigned int id, int index,unsigned int prop)
319 {
320 struct extcon_cable *cable;
321 int type, ret;
322
323 /* Check whether the property is supported or not. */
324 type = get_extcon_type(prop);
325 if (type < 0)
326 return type;
327
328 cable = &edev->cables[index];
329
330 switch (type) {
331 case EXTCON_TYPE_USB:
332 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
333 break;
334 case EXTCON_TYPE_CHG:
335 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
336 break;
337 case EXTCON_TYPE_JACK:
338 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
339 break;
340 case EXTCON_TYPE_DISP:
341 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
342 break;
343 default:
344 ret = -EINVAL;
345 }
346
347 return ret;
348 }
349
350 static void init_property(struct extcon_dev *edev, unsigned int id, int index)
351 {
352 unsigned int type = extcon_info[id].type;
353 struct extcon_cable *cable = &edev->cables[index];
354
355 if (EXTCON_TYPE_USB & type)
356 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
357 if (EXTCON_TYPE_CHG & type)
358 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
359 if (EXTCON_TYPE_JACK & type)
360 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
361 if (EXTCON_TYPE_DISP & type)
362 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
363 }
364
365 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
366 char *buf)
367 {
368 int i, count = 0;
369 struct extcon_dev *edev = dev_get_drvdata(dev);
370
371 if (edev->max_supported == 0)
372 return sprintf(buf, "%u\n", edev->state);
373
374 for (i = 0; i < edev->max_supported; i++) {
375 count += sprintf(buf + count, "%s=%d\n",
376 extcon_info[edev->supported_cable[i]].name,
377 !!(edev->state & (1 << i)));
378 }
379
380 return count;
381 }
382 static DEVICE_ATTR_RO(state);
383
384 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
385 char *buf)
386 {
387 struct extcon_dev *edev = dev_get_drvdata(dev);
388
389 return sprintf(buf, "%s\n", edev->name);
390 }
391 static DEVICE_ATTR_RO(name);
392
393 static ssize_t cable_name_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395 {
396 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
397 attr_name);
398 int i = cable->cable_index;
399
400 return sprintf(buf, "%s\n",
401 extcon_info[cable->edev->supported_cable[i]].name);
402 }
403
404 static ssize_t cable_state_show(struct device *dev,
405 struct device_attribute *attr, char *buf)
406 {
407 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
408 attr_state);
409
410 int i = cable->cable_index;
411
412 return sprintf(buf, "%d\n",
413 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
414 }
415
416 /**
417 * extcon_sync() - Synchronize the states for both the attached/detached
418 * @edev: the extcon device that has the cable.
419 *
420 * This function send a notification to synchronize the all states of a
421 * specific external connector
422 */
423 int extcon_sync(struct extcon_dev *edev, unsigned int id)
424 {
425 char name_buf[120];
426 char state_buf[120];
427 char *prop_buf;
428 char *envp[3];
429 int env_offset = 0;
430 int length;
431 int index;
432 int state;
433 unsigned long flags;
434
435 if (!edev)
436 return -EINVAL;
437
438 index = find_cable_index_by_id(edev, id);
439 if (index < 0)
440 return index;
441
442 spin_lock_irqsave(&edev->lock, flags);
443
444 state = !!(edev->state & BIT(index));
445 raw_notifier_call_chain(&edev->nh[index], state, edev);
446
447 /* This could be in interrupt handler */
448 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
449 if (!prop_buf) {
450 /* Unlock early before uevent */
451 spin_unlock_irqrestore(&edev->lock, flags);
452
453 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
454 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
455
456 return 0;
457 }
458
459 length = name_show(&edev->dev, NULL, prop_buf);
460 if (length > 0) {
461 if (prop_buf[length - 1] == '\n')
462 prop_buf[length - 1] = 0;
463 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
464 envp[env_offset++] = name_buf;
465 }
466
467 length = state_show(&edev->dev, NULL, prop_buf);
468 if (length > 0) {
469 if (prop_buf[length - 1] == '\n')
470 prop_buf[length - 1] = 0;
471 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
472 envp[env_offset++] = state_buf;
473 }
474 envp[env_offset] = NULL;
475
476 /* Unlock early before uevent */
477 spin_unlock_irqrestore(&edev->lock, flags);
478 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
479 free_page((unsigned long)prop_buf);
480
481 return 0;
482 }
483 EXPORT_SYMBOL_GPL(extcon_sync);
484
485 /**
486 * extcon_get_state() - Get the state of a external connector.
487 * @edev: the extcon device that has the cable.
488 * @id: the unique id of each external connector in extcon enumeration.
489 */
490 int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
491 {
492 int index, state;
493 unsigned long flags;
494
495 if (!edev)
496 return -EINVAL;
497
498 index = find_cable_index_by_id(edev, id);
499 if (index < 0)
500 return index;
501
502 spin_lock_irqsave(&edev->lock, flags);
503 state = is_extcon_attached(edev, index);
504 spin_unlock_irqrestore(&edev->lock, flags);
505
506 return state;
507 }
508 EXPORT_SYMBOL_GPL(extcon_get_state);
509
510 /**
511 * extcon_set_state() - Set the state of a external connector.
512 * without a notification.
513 * @edev: the extcon device that has the cable.
514 * @id: the unique id of each external connector
515 * in extcon enumeration.
516 * @state: the new cable status. The default semantics is
517 * true: attached / false: detached.
518 *
519 * This function only set the state of a external connector without
520 * a notification. To synchronize the data of a external connector,
521 * use extcon_set_state_sync() and extcon_sync().
522 */
523 int extcon_set_state(struct extcon_dev *edev, unsigned int id,
524 bool cable_state)
525 {
526 unsigned long flags;
527 int index, ret = 0;
528
529 if (!edev)
530 return -EINVAL;
531
532 index = find_cable_index_by_id(edev, id);
533 if (index < 0)
534 return index;
535
536 spin_lock_irqsave(&edev->lock, flags);
537
538 /* Check whether the external connector's state is changed. */
539 if (!is_extcon_changed(edev, index, cable_state))
540 goto out;
541
542 if (check_mutually_exclusive(edev,
543 (edev->state & ~BIT(index)) | (cable_state & BIT(index)))) {
544 ret = -EPERM;
545 goto out;
546 }
547
548 /*
549 * Initialize the value of extcon property before setting
550 * the detached state for an external connector.
551 */
552 if (!cable_state)
553 init_property(edev, id, index);
554
555 /* Update the state for a external connector. */
556 if (cable_state)
557 edev->state |= BIT(index);
558 else
559 edev->state &= ~(BIT(index));
560 out:
561 spin_unlock_irqrestore(&edev->lock, flags);
562
563 return ret;
564 }
565 EXPORT_SYMBOL_GPL(extcon_set_state);
566
567 /**
568 * extcon_set_state_sync() - Set the state of a external connector
569 * with a notification.
570 * @edev: the extcon device that has the cable.
571 * @id: the unique id of each external connector
572 * in extcon enumeration.
573 * @state: the new cable status. The default semantics is
574 * true: attached / false: detached.
575 *
576 * This function set the state of external connector and synchronize the data
577 * by usning a notification.
578 */
579 int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
580 bool cable_state)
581 {
582 int ret, index;
583 unsigned long flags;
584
585 index = find_cable_index_by_id(edev, id);
586 if (index < 0)
587 return index;
588
589 /* Check whether the external connector's state is changed. */
590 spin_lock_irqsave(&edev->lock, flags);
591 ret = is_extcon_changed(edev, index, cable_state);
592 spin_unlock_irqrestore(&edev->lock, flags);
593 if (!ret)
594 return 0;
595
596 ret = extcon_set_state(edev, id, cable_state);
597 if (ret < 0)
598 return ret;
599
600 return extcon_sync(edev, id);
601 }
602 EXPORT_SYMBOL_GPL(extcon_set_state_sync);
603
604 /**
605 * extcon_get_property() - Get the property value of a specific cable.
606 * @edev: the extcon device that has the cable.
607 * @id: the unique id of each external connector
608 * in extcon enumeration.
609 * @prop: the property id among enum extcon_property.
610 * @prop_val: the pointer which store the value of property.
611 *
612 * When getting the property value of external connector, the external connector
613 * should be attached. If detached state, function just return 0 without
614 * property value. Also, the each property should be included in the list of
615 * supported properties according to the type of external connectors.
616 *
617 * Returns 0 if success or error number if fail
618 */
619 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
620 unsigned int prop,
621 union extcon_property_value *prop_val)
622 {
623 struct extcon_cable *cable;
624 unsigned long flags;
625 int index, ret = 0;
626
627 *prop_val = (union extcon_property_value)(0);
628
629 if (!edev)
630 return -EINVAL;
631
632 /* Check whether the property is supported or not */
633 if (!is_extcon_property_supported(id, prop))
634 return -EINVAL;
635
636 /* Find the cable index of external connector by using id */
637 index = find_cable_index_by_id(edev, id);
638 if (index < 0)
639 return index;
640
641 spin_lock_irqsave(&edev->lock, flags);
642
643 /* Check whether the property is available or not. */
644 if (!is_extcon_property_capability(edev, id, index, prop)) {
645 spin_unlock_irqrestore(&edev->lock, flags);
646 return -EPERM;
647 }
648
649 /*
650 * Check whether the external connector is attached.
651 * If external connector is detached, the user can not
652 * get the property value.
653 */
654 if (!is_extcon_attached(edev, index)) {
655 spin_unlock_irqrestore(&edev->lock, flags);
656 return 0;
657 }
658
659 cable = &edev->cables[index];
660
661 /* Get the property value according to extcon type */
662 switch (prop) {
663 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
664 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
665 break;
666 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
667 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
668 break;
669 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
670 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
671 break;
672 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
673 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
674 break;
675 default:
676 ret = -EINVAL;
677 break;
678 }
679
680 spin_unlock_irqrestore(&edev->lock, flags);
681
682 return ret;
683 }
684 EXPORT_SYMBOL_GPL(extcon_get_property);
685
686 /**
687 * extcon_set_property() - Set the property value of a specific cable.
688 * @edev: the extcon device that has the cable.
689 * @id: the unique id of each external connector
690 * in extcon enumeration.
691 * @prop: the property id among enum extcon_property.
692 * @prop_val: the pointer including the new value of property.
693 *
694 * The each property should be included in the list of supported properties
695 * according to the type of external connectors.
696 *
697 * Returns 0 if success or error number if fail
698 */
699 int extcon_set_property(struct extcon_dev *edev, unsigned int id,
700 unsigned int prop,
701 union extcon_property_value prop_val)
702 {
703 struct extcon_cable *cable;
704 unsigned long flags;
705 int index, ret = 0;
706
707 if (!edev)
708 return -EINVAL;
709
710 /* Check whether the property is supported or not */
711 if (!is_extcon_property_supported(id, prop))
712 return -EINVAL;
713
714 /* Find the cable index of external connector by using id */
715 index = find_cable_index_by_id(edev, id);
716 if (index < 0)
717 return index;
718
719 spin_lock_irqsave(&edev->lock, flags);
720
721 /* Check whether the property is available or not. */
722 if (!is_extcon_property_capability(edev, id, index, prop)) {
723 spin_unlock_irqrestore(&edev->lock, flags);
724 return -EPERM;
725 }
726
727 cable = &edev->cables[index];
728
729 /* Set the property value according to extcon type */
730 switch (prop) {
731 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
732 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
733 break;
734 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
735 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
736 break;
737 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
738 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
739 break;
740 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
741 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
742 break;
743 default:
744 ret = -EINVAL;
745 break;
746 }
747
748 spin_unlock_irqrestore(&edev->lock, flags);
749
750 return ret;
751 }
752 EXPORT_SYMBOL_GPL(extcon_set_property);
753
754 /**
755 * extcon_set_property_sync() - Set the property value of a specific cable
756 with a notification.
757 * @prop_val: the pointer including the new value of property.
758 *
759 * When setting the property value of external connector, the external connector
760 * should be attached. The each property should be included in the list of
761 * supported properties according to the type of external connectors.
762 *
763 * Returns 0 if success or error number if fail
764 */
765 int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
766 unsigned int prop,
767 union extcon_property_value prop_val)
768 {
769 int ret;
770
771 ret = extcon_set_property(edev, id, prop, prop_val);
772 if (ret < 0)
773 return ret;
774
775 return extcon_sync(edev, id);
776 }
777 EXPORT_SYMBOL_GPL(extcon_set_property_sync);
778
779 /**
780 * extcon_get_property_capability() - Get the capability of property
781 * of an external connector.
782 * @edev: the extcon device that has the cable.
783 * @id: the unique id of each external connector
784 * in extcon enumeration.
785 * @prop: the property id among enum extcon_property.
786 *
787 * Returns 1 if the property is available or 0 if not available.
788 */
789 int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
790 unsigned int prop)
791 {
792 int index;
793
794 if (!edev)
795 return -EINVAL;
796
797 /* Check whether the property is supported or not */
798 if (!is_extcon_property_supported(id, prop))
799 return -EINVAL;
800
801 /* Find the cable index of external connector by using id */
802 index = find_cable_index_by_id(edev, id);
803 if (index < 0)
804 return index;
805
806 return is_extcon_property_capability(edev, id, index, prop);
807 }
808 EXPORT_SYMBOL_GPL(extcon_get_property_capability);
809
810 /**
811 * extcon_set_property_capability() - Set the capability of a property
812 * of an external connector.
813 * @edev: the extcon device that has the cable.
814 * @id: the unique id of each external connector
815 * in extcon enumeration.
816 * @prop: the property id among enum extcon_property.
817 *
818 * This function set the capability of a property for an external connector
819 * to mark the bit in capability bitmap which mean the available state of
820 * a property.
821 *
822 * Returns 0 if success or error number if fail
823 */
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 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
874 {
875 struct extcon_dev *sd;
876
877 if (!extcon_name)
878 return ERR_PTR(-EINVAL);
879
880 mutex_lock(&extcon_dev_list_lock);
881 list_for_each_entry(sd, &extcon_dev_list, entry) {
882 if (!strcmp(sd->name, extcon_name))
883 goto out;
884 }
885 sd = NULL;
886 out:
887 mutex_unlock(&extcon_dev_list_lock);
888 return sd;
889 }
890 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
891
892 /**
893 * extcon_register_notifier() - Register a notifiee to get notified by
894 * any attach status changes from the extcon.
895 * @edev: the extcon device that has the external connecotr.
896 * @id: the unique id of each external connector in extcon enumeration.
897 * @nb: a notifier block to be registered.
898 *
899 * Note that the second parameter given to the callback of nb (val) is
900 * "old_state", not the current state. The current state can be retrieved
901 * by looking at the third pameter (edev pointer)'s state value.
902 */
903 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
904 struct notifier_block *nb)
905 {
906 unsigned long flags;
907 int ret, idx = -EINVAL;
908
909 if (!nb)
910 return -EINVAL;
911
912 if (edev) {
913 idx = find_cable_index_by_id(edev, id);
914 if (idx < 0)
915 return idx;
916
917 spin_lock_irqsave(&edev->lock, flags);
918 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
919 spin_unlock_irqrestore(&edev->lock, flags);
920 } else {
921 struct extcon_dev *extd;
922
923 mutex_lock(&extcon_dev_list_lock);
924 list_for_each_entry(extd, &extcon_dev_list, entry) {
925 idx = find_cable_index_by_id(extd, id);
926 if (idx >= 0)
927 break;
928 }
929 mutex_unlock(&extcon_dev_list_lock);
930
931 if (idx >= 0) {
932 edev = extd;
933 return extcon_register_notifier(extd, id, nb);
934 } else {
935 ret = -ENODEV;
936 }
937 }
938
939 return ret;
940 }
941 EXPORT_SYMBOL_GPL(extcon_register_notifier);
942
943 /**
944 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
945 * @edev: the extcon device that has the external connecotr.
946 * @id: the unique id of each external connector in extcon enumeration.
947 * @nb: a notifier block to be registered.
948 */
949 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
950 struct notifier_block *nb)
951 {
952 unsigned long flags;
953 int ret, idx;
954
955 if (!edev || !nb)
956 return -EINVAL;
957
958 idx = find_cable_index_by_id(edev, id);
959 if (idx < 0)
960 return idx;
961
962 spin_lock_irqsave(&edev->lock, flags);
963 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
964 spin_unlock_irqrestore(&edev->lock, flags);
965
966 return ret;
967 }
968 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
969
970 static struct attribute *extcon_attrs[] = {
971 &dev_attr_state.attr,
972 &dev_attr_name.attr,
973 NULL,
974 };
975 ATTRIBUTE_GROUPS(extcon);
976
977 static int create_extcon_class(void)
978 {
979 if (!extcon_class) {
980 extcon_class = class_create(THIS_MODULE, "extcon");
981 if (IS_ERR(extcon_class))
982 return PTR_ERR(extcon_class);
983 extcon_class->dev_groups = extcon_groups;
984
985 #if defined(CONFIG_ANDROID)
986 switch_class = class_compat_register("switch");
987 if (WARN(!switch_class, "cannot allocate"))
988 return -ENOMEM;
989 #endif /* CONFIG_ANDROID */
990 }
991
992 return 0;
993 }
994
995 static void extcon_dev_release(struct device *dev)
996 {
997 }
998
999 static const char *muex_name = "mutually_exclusive";
1000 static void dummy_sysfs_dev_release(struct device *dev)
1001 {
1002 }
1003
1004 /*
1005 * extcon_dev_allocate() - Allocate the memory of extcon device.
1006 * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
1007 * If supported_cable is NULL, cable name related APIs
1008 * are disabled.
1009 *
1010 * This function allocates the memory for extcon device without allocating
1011 * memory in each extcon provider driver and initialize default setting for
1012 * extcon device.
1013 *
1014 * Return the pointer of extcon device if success or ERR_PTR(err) if fail
1015 */
1016 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1017 {
1018 struct extcon_dev *edev;
1019
1020 if (!supported_cable)
1021 return ERR_PTR(-EINVAL);
1022
1023 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1024 if (!edev)
1025 return ERR_PTR(-ENOMEM);
1026
1027 edev->max_supported = 0;
1028 edev->supported_cable = supported_cable;
1029
1030 return edev;
1031 }
1032
1033 /*
1034 * extcon_dev_free() - Free the memory of extcon device.
1035 * @edev: the extcon device to free
1036 */
1037 void extcon_dev_free(struct extcon_dev *edev)
1038 {
1039 kfree(edev);
1040 }
1041 EXPORT_SYMBOL_GPL(extcon_dev_free);
1042
1043 /**
1044 * extcon_dev_register() - Register a new extcon device
1045 * @edev : the new extcon device (should be allocated before calling)
1046 *
1047 * Among the members of edev struct, please set the "user initializing data"
1048 * in any case and set the "optional callbacks" if required. However, please
1049 * do not set the values of "internal data", which are initialized by
1050 * this function.
1051 */
1052 int extcon_dev_register(struct extcon_dev *edev)
1053 {
1054 int ret, index = 0;
1055 static atomic_t edev_no = ATOMIC_INIT(-1);
1056
1057 if (!extcon_class) {
1058 ret = create_extcon_class();
1059 if (ret < 0)
1060 return ret;
1061 }
1062
1063 if (!edev || !edev->supported_cable)
1064 return -EINVAL;
1065
1066 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1067
1068 edev->max_supported = index;
1069 if (index > SUPPORTED_CABLE_MAX) {
1070 dev_err(&edev->dev,
1071 "exceed the maximum number of supported cables\n");
1072 return -EINVAL;
1073 }
1074
1075 edev->dev.class = extcon_class;
1076 edev->dev.release = extcon_dev_release;
1077
1078 edev->name = dev_name(edev->dev.parent);
1079 if (IS_ERR_OR_NULL(edev->name)) {
1080 dev_err(&edev->dev,
1081 "extcon device name is null\n");
1082 return -EINVAL;
1083 }
1084 dev_set_name(&edev->dev, "extcon%lu",
1085 (unsigned long)atomic_inc_return(&edev_no));
1086
1087 if (edev->max_supported) {
1088 char buf[10];
1089 char *str;
1090 struct extcon_cable *cable;
1091
1092 edev->cables = kzalloc(sizeof(struct extcon_cable) *
1093 edev->max_supported, GFP_KERNEL);
1094 if (!edev->cables) {
1095 ret = -ENOMEM;
1096 goto err_sysfs_alloc;
1097 }
1098 for (index = 0; index < edev->max_supported; index++) {
1099 cable = &edev->cables[index];
1100
1101 snprintf(buf, 10, "cable.%d", index);
1102 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
1103 GFP_KERNEL);
1104 if (!str) {
1105 for (index--; index >= 0; index--) {
1106 cable = &edev->cables[index];
1107 kfree(cable->attr_g.name);
1108 }
1109 ret = -ENOMEM;
1110
1111 goto err_alloc_cables;
1112 }
1113 strcpy(str, buf);
1114
1115 cable->edev = edev;
1116 cable->cable_index = index;
1117 cable->attrs[0] = &cable->attr_name.attr;
1118 cable->attrs[1] = &cable->attr_state.attr;
1119 cable->attrs[2] = NULL;
1120 cable->attr_g.name = str;
1121 cable->attr_g.attrs = cable->attrs;
1122
1123 sysfs_attr_init(&cable->attr_name.attr);
1124 cable->attr_name.attr.name = "name";
1125 cable->attr_name.attr.mode = 0444;
1126 cable->attr_name.show = cable_name_show;
1127
1128 sysfs_attr_init(&cable->attr_state.attr);
1129 cable->attr_state.attr.name = "state";
1130 cable->attr_state.attr.mode = 0444;
1131 cable->attr_state.show = cable_state_show;
1132 }
1133 }
1134
1135 if (edev->max_supported && edev->mutually_exclusive) {
1136 char buf[80];
1137 char *name;
1138
1139 /* Count the size of mutually_exclusive array */
1140 for (index = 0; edev->mutually_exclusive[index]; index++)
1141 ;
1142
1143 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
1144 (index + 1), GFP_KERNEL);
1145 if (!edev->attrs_muex) {
1146 ret = -ENOMEM;
1147 goto err_muex;
1148 }
1149
1150 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
1151 index, GFP_KERNEL);
1152 if (!edev->d_attrs_muex) {
1153 ret = -ENOMEM;
1154 kfree(edev->attrs_muex);
1155 goto err_muex;
1156 }
1157
1158 for (index = 0; edev->mutually_exclusive[index]; index++) {
1159 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
1160 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
1161 GFP_KERNEL);
1162 if (!name) {
1163 for (index--; index >= 0; index--) {
1164 kfree(edev->d_attrs_muex[index].attr.
1165 name);
1166 }
1167 kfree(edev->d_attrs_muex);
1168 kfree(edev->attrs_muex);
1169 ret = -ENOMEM;
1170 goto err_muex;
1171 }
1172 strcpy(name, buf);
1173 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1174 edev->d_attrs_muex[index].attr.name = name;
1175 edev->d_attrs_muex[index].attr.mode = 0000;
1176 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1177 .attr;
1178 }
1179 edev->attr_g_muex.name = muex_name;
1180 edev->attr_g_muex.attrs = edev->attrs_muex;
1181
1182 }
1183
1184 if (edev->max_supported) {
1185 edev->extcon_dev_type.groups =
1186 kzalloc(sizeof(struct attribute_group *) *
1187 (edev->max_supported + 2), GFP_KERNEL);
1188 if (!edev->extcon_dev_type.groups) {
1189 ret = -ENOMEM;
1190 goto err_alloc_groups;
1191 }
1192
1193 edev->extcon_dev_type.name = dev_name(&edev->dev);
1194 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1195
1196 for (index = 0; index < edev->max_supported; index++)
1197 edev->extcon_dev_type.groups[index] =
1198 &edev->cables[index].attr_g;
1199 if (edev->mutually_exclusive)
1200 edev->extcon_dev_type.groups[index] =
1201 &edev->attr_g_muex;
1202
1203 edev->dev.type = &edev->extcon_dev_type;
1204 }
1205
1206 ret = device_register(&edev->dev);
1207 if (ret) {
1208 put_device(&edev->dev);
1209 goto err_dev;
1210 }
1211 #if defined(CONFIG_ANDROID)
1212 if (switch_class)
1213 ret = class_compat_create_link(switch_class, &edev->dev, NULL);
1214 #endif /* CONFIG_ANDROID */
1215
1216 spin_lock_init(&edev->lock);
1217
1218 edev->nh = devm_kzalloc(&edev->dev,
1219 sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL);
1220 if (!edev->nh) {
1221 ret = -ENOMEM;
1222 goto err_dev;
1223 }
1224
1225 for (index = 0; index < edev->max_supported; index++)
1226 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1227
1228 dev_set_drvdata(&edev->dev, edev);
1229 edev->state = 0;
1230
1231 mutex_lock(&extcon_dev_list_lock);
1232 list_add(&edev->entry, &extcon_dev_list);
1233 mutex_unlock(&extcon_dev_list_lock);
1234
1235 return 0;
1236
1237 err_dev:
1238 if (edev->max_supported)
1239 kfree(edev->extcon_dev_type.groups);
1240 err_alloc_groups:
1241 if (edev->max_supported && edev->mutually_exclusive) {
1242 for (index = 0; edev->mutually_exclusive[index]; index++)
1243 kfree(edev->d_attrs_muex[index].attr.name);
1244 kfree(edev->d_attrs_muex);
1245 kfree(edev->attrs_muex);
1246 }
1247 err_muex:
1248 for (index = 0; index < edev->max_supported; index++)
1249 kfree(edev->cables[index].attr_g.name);
1250 err_alloc_cables:
1251 if (edev->max_supported)
1252 kfree(edev->cables);
1253 err_sysfs_alloc:
1254 return ret;
1255 }
1256 EXPORT_SYMBOL_GPL(extcon_dev_register);
1257
1258 /**
1259 * extcon_dev_unregister() - Unregister the extcon device.
1260 * @edev: the extcon device instance to be unregistered.
1261 *
1262 * Note that this does not call kfree(edev) because edev was not allocated
1263 * by this class.
1264 */
1265 void extcon_dev_unregister(struct extcon_dev *edev)
1266 {
1267 int index;
1268
1269 if (!edev)
1270 return;
1271
1272 mutex_lock(&extcon_dev_list_lock);
1273 list_del(&edev->entry);
1274 mutex_unlock(&extcon_dev_list_lock);
1275
1276 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1277 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1278 dev_name(&edev->dev));
1279 return;
1280 }
1281
1282 device_unregister(&edev->dev);
1283
1284 if (edev->mutually_exclusive && edev->max_supported) {
1285 for (index = 0; edev->mutually_exclusive[index];
1286 index++)
1287 kfree(edev->d_attrs_muex[index].attr.name);
1288 kfree(edev->d_attrs_muex);
1289 kfree(edev->attrs_muex);
1290 }
1291
1292 for (index = 0; index < edev->max_supported; index++)
1293 kfree(edev->cables[index].attr_g.name);
1294
1295 if (edev->max_supported) {
1296 kfree(edev->extcon_dev_type.groups);
1297 kfree(edev->cables);
1298 }
1299
1300 #if defined(CONFIG_ANDROID)
1301 if (switch_class)
1302 class_compat_remove_link(switch_class, &edev->dev, NULL);
1303 #endif
1304 put_device(&edev->dev);
1305 }
1306 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1307
1308 #ifdef CONFIG_OF
1309 /*
1310 * extcon_get_edev_by_phandle - Get the extcon device from devicetree
1311 * @dev - instance to the given device
1312 * @index - index into list of extcon_dev
1313 *
1314 * return the instance of extcon device
1315 */
1316 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1317 {
1318 struct device_node *node;
1319 struct extcon_dev *edev;
1320
1321 if (!dev)
1322 return ERR_PTR(-EINVAL);
1323
1324 if (!dev->of_node) {
1325 dev_dbg(dev, "device does not have a device node entry\n");
1326 return ERR_PTR(-EINVAL);
1327 }
1328
1329 node = of_parse_phandle(dev->of_node, "extcon", index);
1330 if (!node) {
1331 dev_dbg(dev, "failed to get phandle in %s node\n",
1332 dev->of_node->full_name);
1333 return ERR_PTR(-ENODEV);
1334 }
1335
1336 mutex_lock(&extcon_dev_list_lock);
1337 list_for_each_entry(edev, &extcon_dev_list, entry) {
1338 if (edev->dev.parent && edev->dev.parent->of_node == node) {
1339 mutex_unlock(&extcon_dev_list_lock);
1340 of_node_put(node);
1341 return edev;
1342 }
1343 }
1344 mutex_unlock(&extcon_dev_list_lock);
1345 of_node_put(node);
1346
1347 return ERR_PTR(-EPROBE_DEFER);
1348 }
1349 #else
1350 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1351 {
1352 return ERR_PTR(-ENOSYS);
1353 }
1354 #endif /* CONFIG_OF */
1355 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1356
1357 /**
1358 * extcon_get_edev_name() - Get the name of the extcon device.
1359 * @edev: the extcon device
1360 */
1361 const char *extcon_get_edev_name(struct extcon_dev *edev)
1362 {
1363 return !edev ? NULL : edev->name;
1364 }
1365
1366 static int __init extcon_class_init(void)
1367 {
1368 return create_extcon_class();
1369 }
1370 module_init(extcon_class_init);
1371
1372 static void __exit extcon_class_exit(void)
1373 {
1374 #if defined(CONFIG_ANDROID)
1375 class_compat_unregister(switch_class);
1376 #endif
1377 class_destroy(extcon_class);
1378 }
1379 module_exit(extcon_class_exit);
1380
1381 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1382 MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
1383 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
1384 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1385 MODULE_DESCRIPTION("External connector (extcon) class driver");
1386 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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