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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
41static const char *extcon_name[] = {
42 [EXTCON_NONE] = "NONE",
43
44 /* USB external connector */
45 [EXTCON_USB] = "USB",
46 [EXTCON_USB_HOST] = "USB-HOST",
47
48 /* Charging external connector */
49 [EXTCON_CHG_USB_SDP] = "SDP",
50 [EXTCON_CHG_USB_DCP] = "DCP",
51 [EXTCON_CHG_USB_CDP] = "CDP",
52 [EXTCON_CHG_USB_ACA] = "ACA",
53 [EXTCON_CHG_USB_FAST] = "FAST-CHARGER",
54 [EXTCON_CHG_USB_SLOW] = "SLOW-CHARGER",
55
56 /* Jack external connector */
57 [EXTCON_JACK_MICROPHONE] = "MICROPHONE",
58 [EXTCON_JACK_HEADPHONE] = "HEADPHONE",
59 [EXTCON_JACK_LINE_IN] = "LINE-IN",
60 [EXTCON_JACK_LINE_OUT] = "LINE-OUT",
61 [EXTCON_JACK_VIDEO_IN] = "VIDEO-IN",
62 [EXTCON_JACK_VIDEO_OUT] = "VIDEO-OUT",
63 [EXTCON_JACK_SPDIF_IN] = "SPDIF-IN",
64 [EXTCON_JACK_SPDIF_OUT] = "SPDIF-OUT",
65
66 /* Display external connector */
67 [EXTCON_DISP_HDMI] = "HDMI",
68 [EXTCON_DISP_MHL] = "MHL",
69 [EXTCON_DISP_DVI] = "DVI",
70 [EXTCON_DISP_VGA] = "VGA",
71
72 /* Miscellaneous external connector */
73 [EXTCON_DOCK] = "DOCK",
74 [EXTCON_JIG] = "JIG",
75 [EXTCON_MECHANICAL] = "MECHANICAL",
76
77 NULL,
78};
79
80static struct class *extcon_class;
81#if defined(CONFIG_ANDROID)
82static struct class_compat *switch_class;
83#endif /* CONFIG_ANDROID */
84
85static LIST_HEAD(extcon_dev_list);
86static DEFINE_MUTEX(extcon_dev_list_lock);
87
88/**
89 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
90 * condition.
91 * @edev: the extcon device
92 * @new_state: new cable attach status for @edev
93 *
94 * Returns 0 if nothing violates. Returns the index + 1 for the first
95 * violated condition.
96 */
97static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
98{
99 int i = 0;
100
101 if (!edev->mutually_exclusive)
102 return 0;
103
104 for (i = 0; edev->mutually_exclusive[i]; i++) {
105 int weight;
106 u32 correspondants = new_state & edev->mutually_exclusive[i];
107
108 /* calculate the total number of bits set */
109 weight = hweight32(correspondants);
110 if (weight > 1)
111 return i + 1;
112 }
113
114 return 0;
115}
116
117static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
118{
119 int i;
120
121 /* Find the the index of extcon cable in edev->supported_cable */
122 for (i = 0; i < edev->max_supported; i++) {
123 if (edev->supported_cable[i] == id)
124 return i;
125 }
126
127 return -EINVAL;
128}
129
130static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
131{
132 int id = -EINVAL;
133 int i = 0;
134
135 /* Find the id of extcon cable */
136 while (extcon_name[i]) {
137 if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
138 id = i;
139 break;
140 }
141 i++;
142 }
143
144 return id;
145}
146
147static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
148{
149 int id;
150
151 if (edev->max_supported == 0)
152 return -EINVAL;
153
154 /* Find the the number of extcon cable */
155 id = find_cable_id_by_name(edev, name);
156 if (id < 0)
157 return id;
158
159 return find_cable_index_by_id(edev, id);
160}
161
162static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached)
163{
164 if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) {
165 *attached = ((new >> idx) & 0x1) ? true : false;
166 return true;
167 }
168
169 return false;
170}
171
172static ssize_t state_show(struct device *dev, struct device_attribute *attr,
173 char *buf)
174{
175 int i, count = 0;
176 struct extcon_dev *edev = dev_get_drvdata(dev);
177
178 if (edev->max_supported == 0)
179 return sprintf(buf, "%u\n", edev->state);
180
181 for (i = 0; i < edev->max_supported; i++) {
182 count += sprintf(buf + count, "%s=%d\n",
183 extcon_name[edev->supported_cable[i]],
184 !!(edev->state & (1 << i)));
185 }
186
187 return count;
188}
189
190static ssize_t state_store(struct device *dev, struct device_attribute *attr,
191 const char *buf, size_t count)
192{
193 u32 state;
194 ssize_t ret = 0;
195 struct extcon_dev *edev = dev_get_drvdata(dev);
196
197 ret = sscanf(buf, "0x%x", &state);
198 if (ret == 0)
199 ret = -EINVAL;
200 else
201 ret = extcon_set_state(edev, state);
202
203 if (ret < 0)
204 return ret;
205
206 return count;
207}
208static DEVICE_ATTR_RW(state);
209
210static ssize_t name_show(struct device *dev, struct device_attribute *attr,
211 char *buf)
212{
213 struct extcon_dev *edev = dev_get_drvdata(dev);
214
215 return sprintf(buf, "%s\n", edev->name);
216}
217static DEVICE_ATTR_RO(name);
218
219static ssize_t cable_name_show(struct device *dev,
220 struct device_attribute *attr, char *buf)
221{
222 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
223 attr_name);
224 int i = cable->cable_index;
225
226 return sprintf(buf, "%s\n",
227 extcon_name[cable->edev->supported_cable[i]]);
228}
229
230static ssize_t cable_state_show(struct device *dev,
231 struct device_attribute *attr, char *buf)
232{
233 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
234 attr_state);
235
236 int i = cable->cable_index;
237
238 return sprintf(buf, "%d\n",
239 extcon_get_cable_state_(cable->edev,
240 cable->edev->supported_cable[i]));
241}
242
243/**
244 * extcon_update_state() - Update the cable attach states of the extcon device
245 * only for the masked bits.
246 * @edev: the extcon device
247 * @mask: the bit mask to designate updated bits.
248 * @state: new cable attach status for @edev
249 *
250 * Changing the state sends uevent with environment variable containing
251 * the name of extcon device (envp[0]) and the state output (envp[1]).
252 * Tizen uses this format for extcon device to get events from ports.
253 * Android uses this format as well.
254 *
255 * Note that the notifier provides which bits are changed in the state
256 * variable with the val parameter (second) to the callback.
257 */
258int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
259{
260 char name_buf[120];
261 char state_buf[120];
262 char *prop_buf;
263 char *envp[3];
264 int env_offset = 0;
265 int length;
266 int index;
267 unsigned long flags;
268 bool attached;
269
270 if (!edev)
271 return -EINVAL;
272
273 spin_lock_irqsave(&edev->lock, flags);
274
275 if (edev->state != ((edev->state & ~mask) | (state & mask))) {
276 u32 old_state;
277
278 if (check_mutually_exclusive(edev, (edev->state & ~mask) |
279 (state & mask))) {
280 spin_unlock_irqrestore(&edev->lock, flags);
281 return -EPERM;
282 }
283
284 old_state = edev->state;
285 edev->state &= ~mask;
286 edev->state |= state & mask;
287
288 for (index = 0; index < edev->max_supported; index++) {
289 if (is_extcon_changed(old_state, edev->state, index,
290 &attached))
291 raw_notifier_call_chain(&edev->nh[index],
292 attached, edev);
293 }
294
295 /* This could be in interrupt handler */
296 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
297 if (prop_buf) {
298 length = name_show(&edev->dev, NULL, prop_buf);
299 if (length > 0) {
300 if (prop_buf[length - 1] == '\n')
301 prop_buf[length - 1] = 0;
302 snprintf(name_buf, sizeof(name_buf),
303 "NAME=%s", prop_buf);
304 envp[env_offset++] = name_buf;
305 }
306 length = state_show(&edev->dev, NULL, prop_buf);
307 if (length > 0) {
308 if (prop_buf[length - 1] == '\n')
309 prop_buf[length - 1] = 0;
310 snprintf(state_buf, sizeof(state_buf),
311 "STATE=%s", prop_buf);
312 envp[env_offset++] = state_buf;
313 }
314 envp[env_offset] = NULL;
315 /* Unlock early before uevent */
316 spin_unlock_irqrestore(&edev->lock, flags);
317
318 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
319 free_page((unsigned long)prop_buf);
320 } else {
321 /* Unlock early before uevent */
322 spin_unlock_irqrestore(&edev->lock, flags);
323
324 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
325 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
326 }
327 } else {
328 /* No changes */
329 spin_unlock_irqrestore(&edev->lock, flags);
330 }
331
332 return 0;
333}
334EXPORT_SYMBOL_GPL(extcon_update_state);
335
336/**
337 * extcon_set_state() - Set the cable attach states of the extcon device.
338 * @edev: the extcon device
339 * @state: new cable attach status for @edev
340 *
341 * Note that notifier provides which bits are changed in the state
342 * variable with the val parameter (second) to the callback.
343 */
344int extcon_set_state(struct extcon_dev *edev, u32 state)
345{
346 if (!edev)
347 return -EINVAL;
348
349 return extcon_update_state(edev, 0xffffffff, state);
350}
351EXPORT_SYMBOL_GPL(extcon_set_state);
352
353/**
354 * extcon_get_cable_state_() - Get the status of a specific cable.
355 * @edev: the extcon device that has the cable.
356 * @id: the unique id of each external connector in extcon enumeration.
357 */
358int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
359{
360 int index;
361
362 if (!edev)
363 return -EINVAL;
364
365 index = find_cable_index_by_id(edev, id);
366 if (index < 0)
367 return index;
368
369 if (edev->max_supported && edev->max_supported <= index)
370 return -EINVAL;
371
372 return !!(edev->state & (1 << index));
373}
374EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
375
376/**
377 * extcon_get_cable_state() - Get the status of a specific cable.
378 * @edev: the extcon device that has the cable.
379 * @cable_name: cable name.
380 *
381 * Note that this is slower than extcon_get_cable_state_.
382 */
383int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
384{
385 int id;
386
387 id = find_cable_id_by_name(edev, cable_name);
388 if (id < 0)
389 return id;
390
391 return extcon_get_cable_state_(edev, id);
392}
393EXPORT_SYMBOL_GPL(extcon_get_cable_state);
394
395/**
396 * extcon_set_cable_state_() - Set the status of a specific cable.
397 * @edev: the extcon device that has the cable.
398 * @id: the unique id of each external connector
399 * in extcon enumeration.
400 * @state: the new cable status. The default semantics is
401 * true: attached / false: detached.
402 */
403int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
404 bool cable_state)
405{
406 u32 state;
407 int index;
408
409 if (!edev)
410 return -EINVAL;
411
412 index = find_cable_index_by_id(edev, id);
413 if (index < 0)
414 return index;
415
416 if (edev->max_supported && edev->max_supported <= index)
417 return -EINVAL;
418
419 state = cable_state ? (1 << index) : 0;
420 return extcon_update_state(edev, 1 << index, state);
421}
422EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
423
424/**
425 * extcon_set_cable_state() - Set the status of a specific cable.
426 * @edev: the extcon device that has the cable.
427 * @cable_name: cable name.
428 * @cable_state: the new cable status. The default semantics is
429 * true: attached / false: detached.
430 *
431 * Note that this is slower than extcon_set_cable_state_.
432 */
433int extcon_set_cable_state(struct extcon_dev *edev,
434 const char *cable_name, bool cable_state)
435{
436 int id;
437
438 id = find_cable_id_by_name(edev, cable_name);
439 if (id < 0)
440 return id;
441
442 return extcon_set_cable_state_(edev, id, cable_state);
443}
444EXPORT_SYMBOL_GPL(extcon_set_cable_state);
445
446/**
447 * extcon_get_extcon_dev() - Get the extcon device instance from the name
448 * @extcon_name: The extcon name provided with extcon_dev_register()
449 */
450struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
451{
452 struct extcon_dev *sd;
453
454 if (!extcon_name)
455 return ERR_PTR(-EINVAL);
456
457 mutex_lock(&extcon_dev_list_lock);
458 list_for_each_entry(sd, &extcon_dev_list, entry) {
459 if (!strcmp(sd->name, extcon_name))
460 goto out;
461 }
462 sd = NULL;
463out:
464 mutex_unlock(&extcon_dev_list_lock);
465 return sd;
466}
467EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
468
469/**
470 * extcon_register_interest() - Register a notifier for a state change of a
471 * specific cable, not an entier set of cables of a
472 * extcon device.
473 * @obj: an empty extcon_specific_cable_nb object to be returned.
474 * @extcon_name: the name of extcon device.
475 * if NULL, extcon_register_interest will register
476 * every cable with the target cable_name given.
477 * @cable_name: the target cable name.
478 * @nb: the notifier block to get notified.
479 *
480 * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
481 * the struct for you.
482 *
483 * extcon_register_interest is a helper function for those who want to get
484 * notification for a single specific cable's status change. If a user wants
485 * to get notification for any changes of all cables of a extcon device,
486 * he/she should use the general extcon_register_notifier().
487 *
488 * Note that the second parameter given to the callback of nb (val) is
489 * "old_state", not the current state. The current state can be retrieved
490 * by looking at the third pameter (edev pointer)'s state value.
491 */
492int extcon_register_interest(struct extcon_specific_cable_nb *obj,
493 const char *extcon_name, const char *cable_name,
494 struct notifier_block *nb)
495{
496 unsigned long flags;
497 int ret;
498
499 if (!obj || !cable_name || !nb)
500 return -EINVAL;
501
502 if (extcon_name) {
503 obj->edev = extcon_get_extcon_dev(extcon_name);
504 if (!obj->edev)
505 return -ENODEV;
506
507 obj->cable_index = find_cable_index_by_name(obj->edev,
508 cable_name);
509 if (obj->cable_index < 0)
510 return obj->cable_index;
511
512 obj->user_nb = nb;
513
514 spin_lock_irqsave(&obj->edev->lock, flags);
515 ret = raw_notifier_chain_register(
516 &obj->edev->nh[obj->cable_index],
517 obj->user_nb);
518 spin_unlock_irqrestore(&obj->edev->lock, flags);
519 } else {
520 struct class_dev_iter iter;
521 struct extcon_dev *extd;
522 struct device *dev;
523
524 if (!extcon_class)
525 return -ENODEV;
526 class_dev_iter_init(&iter, extcon_class, NULL, NULL);
527 while ((dev = class_dev_iter_next(&iter))) {
528 extd = dev_get_drvdata(dev);
529
530 if (find_cable_index_by_name(extd, cable_name) < 0)
531 continue;
532
533 class_dev_iter_exit(&iter);
534 return extcon_register_interest(obj, extd->name,
535 cable_name, nb);
536 }
537
538 ret = -ENODEV;
539 }
540
541 return ret;
542}
543EXPORT_SYMBOL_GPL(extcon_register_interest);
544
545/**
546 * extcon_unregister_interest() - Unregister the notifier registered by
547 * extcon_register_interest().
548 * @obj: the extcon_specific_cable_nb object returned by
549 * extcon_register_interest().
550 */
551int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
552{
553 unsigned long flags;
554 int ret;
555
556 if (!obj)
557 return -EINVAL;
558
559 spin_lock_irqsave(&obj->edev->lock, flags);
560 ret = raw_notifier_chain_unregister(
561 &obj->edev->nh[obj->cable_index], obj->user_nb);
562 spin_unlock_irqrestore(&obj->edev->lock, flags);
563
564 return ret;
565}
566EXPORT_SYMBOL_GPL(extcon_unregister_interest);
567
568/**
569 * extcon_register_notifier() - Register a notifiee to get notified by
570 * any attach status changes from the extcon.
571 * @edev: the extcon device that has the external connecotr.
572 * @id: the unique id of each external connector in extcon enumeration.
573 * @nb: a notifier block to be registered.
574 *
575 * Note that the second parameter given to the callback of nb (val) is
576 * "old_state", not the current state. The current state can be retrieved
577 * by looking at the third pameter (edev pointer)'s state value.
578 */
579int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
580 struct notifier_block *nb)
581{
582 unsigned long flags;
583 int ret, idx;
584
585 if (!edev || !nb)
586 return -EINVAL;
587
588 idx = find_cable_index_by_id(edev, id);
589
590 spin_lock_irqsave(&edev->lock, flags);
591 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
592 spin_unlock_irqrestore(&edev->lock, flags);
593
594 return ret;
595}
596EXPORT_SYMBOL_GPL(extcon_register_notifier);
597
598/**
599 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
600 * @edev: the extcon device that has the external connecotr.
601 * @id: the unique id of each external connector in extcon enumeration.
602 * @nb: a notifier block to be registered.
603 */
604int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
605 struct notifier_block *nb)
606{
607 unsigned long flags;
608 int ret, idx;
609
610 if (!edev || !nb)
611 return -EINVAL;
612
613 idx = find_cable_index_by_id(edev, id);
614
615 spin_lock_irqsave(&edev->lock, flags);
616 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
617 spin_unlock_irqrestore(&edev->lock, flags);
618
619 return ret;
620}
621EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
622
623static struct attribute *extcon_attrs[] = {
624 &dev_attr_state.attr,
625 &dev_attr_name.attr,
626 NULL,
627};
628ATTRIBUTE_GROUPS(extcon);
629
630static int create_extcon_class(void)
631{
632 if (!extcon_class) {
633 extcon_class = class_create(THIS_MODULE, "extcon");
634 if (IS_ERR(extcon_class))
635 return PTR_ERR(extcon_class);
636 extcon_class->dev_groups = extcon_groups;
637
638#if defined(CONFIG_ANDROID)
639 switch_class = class_compat_register("switch");
640 if (WARN(!switch_class, "cannot allocate"))
641 return -ENOMEM;
642#endif /* CONFIG_ANDROID */
643 }
644
645 return 0;
646}
647
648static void extcon_dev_release(struct device *dev)
649{
650}
651
652static const char *muex_name = "mutually_exclusive";
653static void dummy_sysfs_dev_release(struct device *dev)
654{
655}
656
657/*
658 * extcon_dev_allocate() - Allocate the memory of extcon device.
659 * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
660 * If supported_cable is NULL, cable name related APIs
661 * are disabled.
662 *
663 * This function allocates the memory for extcon device without allocating
664 * memory in each extcon provider driver and initialize default setting for
665 * extcon device.
666 *
667 * Return the pointer of extcon device if success or ERR_PTR(err) if fail
668 */
669struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
670{
671 struct extcon_dev *edev;
672
673 if (!supported_cable)
674 return ERR_PTR(-EINVAL);
675
676 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
677 if (!edev)
678 return ERR_PTR(-ENOMEM);
679
680 edev->max_supported = 0;
681 edev->supported_cable = supported_cable;
682
683 return edev;
684}
685
686/*
687 * extcon_dev_free() - Free the memory of extcon device.
688 * @edev: the extcon device to free
689 */
690void extcon_dev_free(struct extcon_dev *edev)
691{
692 kfree(edev);
693}
694EXPORT_SYMBOL_GPL(extcon_dev_free);
695
696static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
697{
698 struct extcon_dev **r = res;
699
700 if (WARN_ON(!r || !*r))
701 return 0;
702
703 return *r == data;
704}
705
706static void devm_extcon_dev_release(struct device *dev, void *res)
707{
708 extcon_dev_free(*(struct extcon_dev **)res);
709}
710
711/**
712 * devm_extcon_dev_allocate - Allocate managed extcon device
713 * @dev: device owning the extcon device being created
714 * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
715 * If supported_cable is NULL, cable name related APIs
716 * are disabled.
717 *
718 * This function manages automatically the memory of extcon device using device
719 * resource management and simplify the control of freeing the memory of extcon
720 * device.
721 *
722 * Returns the pointer memory of allocated extcon_dev if success
723 * or ERR_PTR(err) if fail
724 */
725struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
726 const unsigned int *supported_cable)
727{
728 struct extcon_dev **ptr, *edev;
729
730 ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
731 if (!ptr)
732 return ERR_PTR(-ENOMEM);
733
734 edev = extcon_dev_allocate(supported_cable);
735 if (IS_ERR(edev)) {
736 devres_free(ptr);
737 return edev;
738 }
739
740 edev->dev.parent = dev;
741
742 *ptr = edev;
743 devres_add(dev, ptr);
744
745 return edev;
746}
747EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
748
749void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
750{
751 WARN_ON(devres_release(dev, devm_extcon_dev_release,
752 devm_extcon_dev_match, edev));
753}
754EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
755
756/**
757 * extcon_dev_register() - Register a new extcon device
758 * @edev : the new extcon device (should be allocated before calling)
759 *
760 * Among the members of edev struct, please set the "user initializing data"
761 * in any case and set the "optional callbacks" if required. However, please
762 * do not set the values of "internal data", which are initialized by
763 * this function.
764 */
765int extcon_dev_register(struct extcon_dev *edev)
766{
767 int ret, index = 0;
768 static atomic_t edev_no = ATOMIC_INIT(-1);
769
770 if (!extcon_class) {
771 ret = create_extcon_class();
772 if (ret < 0)
773 return ret;
774 }
775
776 if (!edev || !edev->supported_cable)
777 return -EINVAL;
778
779 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
780
781 edev->max_supported = index;
782 if (index > SUPPORTED_CABLE_MAX) {
783 dev_err(&edev->dev,
784 "exceed the maximum number of supported cables\n");
785 return -EINVAL;
786 }
787
788 edev->dev.class = extcon_class;
789 edev->dev.release = extcon_dev_release;
790
791 edev->name = dev_name(edev->dev.parent);
792 if (IS_ERR_OR_NULL(edev->name)) {
793 dev_err(&edev->dev,
794 "extcon device name is null\n");
795 return -EINVAL;
796 }
797 dev_set_name(&edev->dev, "extcon%lu",
798 (unsigned long)atomic_inc_return(&edev_no));
799
800 if (edev->max_supported) {
801 char buf[10];
802 char *str;
803 struct extcon_cable *cable;
804
805 edev->cables = kzalloc(sizeof(struct extcon_cable) *
806 edev->max_supported, GFP_KERNEL);
807 if (!edev->cables) {
808 ret = -ENOMEM;
809 goto err_sysfs_alloc;
810 }
811 for (index = 0; index < edev->max_supported; index++) {
812 cable = &edev->cables[index];
813
814 snprintf(buf, 10, "cable.%d", index);
815 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
816 GFP_KERNEL);
817 if (!str) {
818 for (index--; index >= 0; index--) {
819 cable = &edev->cables[index];
820 kfree(cable->attr_g.name);
821 }
822 ret = -ENOMEM;
823
824 goto err_alloc_cables;
825 }
826 strcpy(str, buf);
827
828 cable->edev = edev;
829 cable->cable_index = index;
830 cable->attrs[0] = &cable->attr_name.attr;
831 cable->attrs[1] = &cable->attr_state.attr;
832 cable->attrs[2] = NULL;
833 cable->attr_g.name = str;
834 cable->attr_g.attrs = cable->attrs;
835
836 sysfs_attr_init(&cable->attr_name.attr);
837 cable->attr_name.attr.name = "name";
838 cable->attr_name.attr.mode = 0444;
839 cable->attr_name.show = cable_name_show;
840
841 sysfs_attr_init(&cable->attr_state.attr);
842 cable->attr_state.attr.name = "state";
843 cable->attr_state.attr.mode = 0444;
844 cable->attr_state.show = cable_state_show;
845 }
846 }
847
848 if (edev->max_supported && edev->mutually_exclusive) {
849 char buf[80];
850 char *name;
851
852 /* Count the size of mutually_exclusive array */
853 for (index = 0; edev->mutually_exclusive[index]; index++)
854 ;
855
856 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
857 (index + 1), GFP_KERNEL);
858 if (!edev->attrs_muex) {
859 ret = -ENOMEM;
860 goto err_muex;
861 }
862
863 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
864 index, GFP_KERNEL);
865 if (!edev->d_attrs_muex) {
866 ret = -ENOMEM;
867 kfree(edev->attrs_muex);
868 goto err_muex;
869 }
870
871 for (index = 0; edev->mutually_exclusive[index]; index++) {
872 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
873 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
874 GFP_KERNEL);
875 if (!name) {
876 for (index--; index >= 0; index--) {
877 kfree(edev->d_attrs_muex[index].attr.
878 name);
879 }
880 kfree(edev->d_attrs_muex);
881 kfree(edev->attrs_muex);
882 ret = -ENOMEM;
883 goto err_muex;
884 }
885 strcpy(name, buf);
886 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
887 edev->d_attrs_muex[index].attr.name = name;
888 edev->d_attrs_muex[index].attr.mode = 0000;
889 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
890 .attr;
891 }
892 edev->attr_g_muex.name = muex_name;
893 edev->attr_g_muex.attrs = edev->attrs_muex;
894
895 }
896
897 if (edev->max_supported) {
898 edev->extcon_dev_type.groups =
899 kzalloc(sizeof(struct attribute_group *) *
900 (edev->max_supported + 2), GFP_KERNEL);
901 if (!edev->extcon_dev_type.groups) {
902 ret = -ENOMEM;
903 goto err_alloc_groups;
904 }
905
906 edev->extcon_dev_type.name = dev_name(&edev->dev);
907 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
908
909 for (index = 0; index < edev->max_supported; index++)
910 edev->extcon_dev_type.groups[index] =
911 &edev->cables[index].attr_g;
912 if (edev->mutually_exclusive)
913 edev->extcon_dev_type.groups[index] =
914 &edev->attr_g_muex;
915
916 edev->dev.type = &edev->extcon_dev_type;
917 }
918
919 ret = device_register(&edev->dev);
920 if (ret) {
921 put_device(&edev->dev);
922 goto err_dev;
923 }
924#if defined(CONFIG_ANDROID)
925 if (switch_class)
926 ret = class_compat_create_link(switch_class, &edev->dev, NULL);
927#endif /* CONFIG_ANDROID */
928
929 spin_lock_init(&edev->lock);
930
931 edev->nh = devm_kzalloc(&edev->dev,
932 sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL);
933 if (!edev->nh) {
934 ret = -ENOMEM;
935 goto err_dev;
936 }
937
938 for (index = 0; index < edev->max_supported; index++)
939 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
940
941 dev_set_drvdata(&edev->dev, edev);
942 edev->state = 0;
943
944 mutex_lock(&extcon_dev_list_lock);
945 list_add(&edev->entry, &extcon_dev_list);
946 mutex_unlock(&extcon_dev_list_lock);
947
948 return 0;
949
950err_dev:
951 if (edev->max_supported)
952 kfree(edev->extcon_dev_type.groups);
953err_alloc_groups:
954 if (edev->max_supported && edev->mutually_exclusive) {
955 for (index = 0; edev->mutually_exclusive[index]; index++)
956 kfree(edev->d_attrs_muex[index].attr.name);
957 kfree(edev->d_attrs_muex);
958 kfree(edev->attrs_muex);
959 }
960err_muex:
961 for (index = 0; index < edev->max_supported; index++)
962 kfree(edev->cables[index].attr_g.name);
963err_alloc_cables:
964 if (edev->max_supported)
965 kfree(edev->cables);
966err_sysfs_alloc:
967 return ret;
968}
969EXPORT_SYMBOL_GPL(extcon_dev_register);
970
971/**
972 * extcon_dev_unregister() - Unregister the extcon device.
973 * @edev: the extcon device instance to be unregistered.
974 *
975 * Note that this does not call kfree(edev) because edev was not allocated
976 * by this class.
977 */
978void extcon_dev_unregister(struct extcon_dev *edev)
979{
980 int index;
981
982 if (!edev)
983 return;
984
985 mutex_lock(&extcon_dev_list_lock);
986 list_del(&edev->entry);
987 mutex_unlock(&extcon_dev_list_lock);
988
989 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
990 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
991 dev_name(&edev->dev));
992 return;
993 }
994
995 device_unregister(&edev->dev);
996
997 if (edev->mutually_exclusive && edev->max_supported) {
998 for (index = 0; edev->mutually_exclusive[index];
999 index++)
1000 kfree(edev->d_attrs_muex[index].attr.name);
1001 kfree(edev->d_attrs_muex);
1002 kfree(edev->attrs_muex);
1003 }
1004
1005 for (index = 0; index < edev->max_supported; index++)
1006 kfree(edev->cables[index].attr_g.name);
1007
1008 if (edev->max_supported) {
1009 kfree(edev->extcon_dev_type.groups);
1010 kfree(edev->cables);
1011 }
1012
1013#if defined(CONFIG_ANDROID)
1014 if (switch_class)
1015 class_compat_remove_link(switch_class, &edev->dev, NULL);
1016#endif
1017 put_device(&edev->dev);
1018}
1019EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1020
1021static void devm_extcon_dev_unreg(struct device *dev, void *res)
1022{
1023 extcon_dev_unregister(*(struct extcon_dev **)res);
1024}
1025
1026/**
1027 * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
1028 * @dev: device to allocate extcon device
1029 * @edev: the new extcon device to register
1030 *
1031 * Managed extcon_dev_register() function. If extcon device is attached with
1032 * this function, that extcon device is automatically unregistered on driver
1033 * detach. Internally this function calls extcon_dev_register() function.
1034 * To get more information, refer that function.
1035 *
1036 * If extcon device is registered with this function and the device needs to be
1037 * unregistered separately, devm_extcon_dev_unregister() should be used.
1038 *
1039 * Returns 0 if success or negaive error number if failure.
1040 */
1041int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
1042{
1043 struct extcon_dev **ptr;
1044 int ret;
1045
1046 ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
1047 if (!ptr)
1048 return -ENOMEM;
1049
1050 ret = extcon_dev_register(edev);
1051 if (ret) {
1052 devres_free(ptr);
1053 return ret;
1054 }
1055
1056 *ptr = edev;
1057 devres_add(dev, ptr);
1058
1059 return 0;
1060}
1061EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
1062
1063/**
1064 * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
1065 * @dev: device the extcon belongs to
1066 * @edev: the extcon device to unregister
1067 *
1068 * Unregister extcon device that is registered with devm_extcon_dev_register()
1069 * function.
1070 */
1071void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
1072{
1073 WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
1074 devm_extcon_dev_match, edev));
1075}
1076EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
1077
1078#ifdef CONFIG_OF
1079/*
1080 * extcon_get_edev_by_phandle - Get the extcon device from devicetree
1081 * @dev - instance to the given device
1082 * @index - index into list of extcon_dev
1083 *
1084 * return the instance of extcon device
1085 */
1086struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1087{
1088 struct device_node *node;
1089 struct extcon_dev *edev;
1090
1091 if (!dev)
1092 return ERR_PTR(-EINVAL);
1093
1094 if (!dev->of_node) {
1095 dev_err(dev, "device does not have a device node entry\n");
1096 return ERR_PTR(-EINVAL);
1097 }
1098
1099 node = of_parse_phandle(dev->of_node, "extcon", index);
1100 if (!node) {
1101 dev_err(dev, "failed to get phandle in %s node\n",
1102 dev->of_node->full_name);
1103 return ERR_PTR(-ENODEV);
1104 }
1105
1106 mutex_lock(&extcon_dev_list_lock);
1107 list_for_each_entry(edev, &extcon_dev_list, entry) {
1108 if (edev->dev.parent && edev->dev.parent->of_node == node) {
1109 mutex_unlock(&extcon_dev_list_lock);
1110 return edev;
1111 }
1112 }
1113 mutex_unlock(&extcon_dev_list_lock);
1114
1115 return ERR_PTR(-EPROBE_DEFER);
1116}
1117#else
1118struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1119{
1120 return ERR_PTR(-ENOSYS);
1121}
1122#endif /* CONFIG_OF */
1123EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1124
1125/**
1126 * extcon_get_edev_name() - Get the name of the extcon device.
1127 * @edev: the extcon device
1128 */
1129const char *extcon_get_edev_name(struct extcon_dev *edev)
1130{
1131 return !edev ? NULL : edev->name;
1132}
1133
1134static int __init extcon_class_init(void)
1135{
1136 return create_extcon_class();
1137}
1138module_init(extcon_class_init);
1139
1140static void __exit extcon_class_exit(void)
1141{
1142#if defined(CONFIG_ANDROID)
1143 class_compat_unregister(switch_class);
1144#endif
1145 class_destroy(extcon_class);
1146}
1147module_exit(extcon_class_exit);
1148
1149MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1150MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
1151MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
1152MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1153MODULE_DESCRIPTION("External connector (extcon) class driver");
1154MODULE_LICENSE("GPL");
1/*
2 * drivers/extcon/extcon.c - External Connector (extcon) framework.
3 *
4 * Copyright (C) 2015 Samsung Electronics
5 * Author: Chanwoo Choi <cw00.choi@samsung.com>
6 *
7 * Copyright (C) 2012 Samsung Electronics
8 * Author: Donggeun Kim <dg77.kim@samsung.com>
9 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
10 *
11 * based on android/drivers/switch/switch_class.c
12 * Copyright (C) 2008 Google, Inc.
13 * Author: Mike Lockwood <lockwood@android.com>
14 *
15 * This software is licensed under the terms of the GNU General Public
16 * License version 2, as published by the Free Software Foundation, and
17 * may be copied, distributed, and modified under those terms.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 */
24
25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/init.h>
28#include <linux/device.h>
29#include <linux/fs.h>
30#include <linux/err.h>
31#include <linux/of.h>
32#include <linux/slab.h>
33#include <linux/sysfs.h>
34
35#include "extcon.h"
36
37#define SUPPORTED_CABLE_MAX 32
38
39static const struct __extcon_info {
40 unsigned int type;
41 unsigned int id;
42 const char *name;
43
44} extcon_info[] = {
45 [EXTCON_NONE] = {
46 .type = EXTCON_TYPE_MISC,
47 .id = EXTCON_NONE,
48 .name = "NONE",
49 },
50
51 /* USB external connector */
52 [EXTCON_USB] = {
53 .type = EXTCON_TYPE_USB,
54 .id = EXTCON_USB,
55 .name = "USB",
56 },
57 [EXTCON_USB_HOST] = {
58 .type = EXTCON_TYPE_USB,
59 .id = EXTCON_USB_HOST,
60 .name = "USB-HOST",
61 },
62
63 /* Charging external connector */
64 [EXTCON_CHG_USB_SDP] = {
65 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
66 .id = EXTCON_CHG_USB_SDP,
67 .name = "SDP",
68 },
69 [EXTCON_CHG_USB_DCP] = {
70 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
71 .id = EXTCON_CHG_USB_DCP,
72 .name = "DCP",
73 },
74 [EXTCON_CHG_USB_CDP] = {
75 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
76 .id = EXTCON_CHG_USB_CDP,
77 .name = "CDP",
78 },
79 [EXTCON_CHG_USB_ACA] = {
80 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
81 .id = EXTCON_CHG_USB_ACA,
82 .name = "ACA",
83 },
84 [EXTCON_CHG_USB_FAST] = {
85 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
86 .id = EXTCON_CHG_USB_FAST,
87 .name = "FAST-CHARGER",
88 },
89 [EXTCON_CHG_USB_SLOW] = {
90 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
91 .id = EXTCON_CHG_USB_SLOW,
92 .name = "SLOW-CHARGER",
93 },
94 [EXTCON_CHG_WPT] = {
95 .type = EXTCON_TYPE_CHG,
96 .id = EXTCON_CHG_WPT,
97 .name = "WPT",
98 },
99 [EXTCON_CHG_USB_PD] = {
100 .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
101 .id = EXTCON_CHG_USB_PD,
102 .name = "PD",
103 },
104
105 /* Jack external connector */
106 [EXTCON_JACK_MICROPHONE] = {
107 .type = EXTCON_TYPE_JACK,
108 .id = EXTCON_JACK_MICROPHONE,
109 .name = "MICROPHONE",
110 },
111 [EXTCON_JACK_HEADPHONE] = {
112 .type = EXTCON_TYPE_JACK,
113 .id = EXTCON_JACK_HEADPHONE,
114 .name = "HEADPHONE",
115 },
116 [EXTCON_JACK_LINE_IN] = {
117 .type = EXTCON_TYPE_JACK,
118 .id = EXTCON_JACK_LINE_IN,
119 .name = "LINE-IN",
120 },
121 [EXTCON_JACK_LINE_OUT] = {
122 .type = EXTCON_TYPE_JACK,
123 .id = EXTCON_JACK_LINE_OUT,
124 .name = "LINE-OUT",
125 },
126 [EXTCON_JACK_VIDEO_IN] = {
127 .type = EXTCON_TYPE_JACK,
128 .id = EXTCON_JACK_VIDEO_IN,
129 .name = "VIDEO-IN",
130 },
131 [EXTCON_JACK_VIDEO_OUT] = {
132 .type = EXTCON_TYPE_JACK,
133 .id = EXTCON_JACK_VIDEO_OUT,
134 .name = "VIDEO-OUT",
135 },
136 [EXTCON_JACK_SPDIF_IN] = {
137 .type = EXTCON_TYPE_JACK,
138 .id = EXTCON_JACK_SPDIF_IN,
139 .name = "SPDIF-IN",
140 },
141 [EXTCON_JACK_SPDIF_OUT] = {
142 .type = EXTCON_TYPE_JACK,
143 .id = EXTCON_JACK_SPDIF_OUT,
144 .name = "SPDIF-OUT",
145 },
146
147 /* Display external connector */
148 [EXTCON_DISP_HDMI] = {
149 .type = EXTCON_TYPE_DISP,
150 .id = EXTCON_DISP_HDMI,
151 .name = "HDMI",
152 },
153 [EXTCON_DISP_MHL] = {
154 .type = EXTCON_TYPE_DISP,
155 .id = EXTCON_DISP_MHL,
156 .name = "MHL",
157 },
158 [EXTCON_DISP_DVI] = {
159 .type = EXTCON_TYPE_DISP,
160 .id = EXTCON_DISP_DVI,
161 .name = "DVI",
162 },
163 [EXTCON_DISP_VGA] = {
164 .type = EXTCON_TYPE_DISP,
165 .id = EXTCON_DISP_VGA,
166 .name = "VGA",
167 },
168 [EXTCON_DISP_DP] = {
169 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
170 .id = EXTCON_DISP_DP,
171 .name = "DP",
172 },
173 [EXTCON_DISP_HMD] = {
174 .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
175 .id = EXTCON_DISP_HMD,
176 .name = "HMD",
177 },
178
179 /* Miscellaneous external connector */
180 [EXTCON_DOCK] = {
181 .type = EXTCON_TYPE_MISC,
182 .id = EXTCON_DOCK,
183 .name = "DOCK",
184 },
185 [EXTCON_JIG] = {
186 .type = EXTCON_TYPE_MISC,
187 .id = EXTCON_JIG,
188 .name = "JIG",
189 },
190 [EXTCON_MECHANICAL] = {
191 .type = EXTCON_TYPE_MISC,
192 .id = EXTCON_MECHANICAL,
193 .name = "MECHANICAL",
194 },
195
196 { /* sentinel */ }
197};
198
199/**
200 * struct extcon_cable - An internal data for an external connector.
201 * @edev: the extcon device
202 * @cable_index: the index of this cable in the edev
203 * @attr_g: the attribute group for the cable
204 * @attr_name: "name" sysfs entry
205 * @attr_state: "state" sysfs entry
206 * @attrs: the array pointing to attr_name and attr_state for attr_g
207 */
208struct extcon_cable {
209 struct extcon_dev *edev;
210 int cable_index;
211
212 struct attribute_group attr_g;
213 struct device_attribute attr_name;
214 struct device_attribute attr_state;
215
216 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
217
218 union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
219 union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
220 union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
221 union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
222
223 unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
224 unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
225 unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
226 unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
227};
228
229static struct class *extcon_class;
230
231static LIST_HEAD(extcon_dev_list);
232static DEFINE_MUTEX(extcon_dev_list_lock);
233
234static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
235{
236 int i = 0;
237
238 if (!edev->mutually_exclusive)
239 return 0;
240
241 for (i = 0; edev->mutually_exclusive[i]; i++) {
242 int weight;
243 u32 correspondants = new_state & edev->mutually_exclusive[i];
244
245 /* calculate the total number of bits set */
246 weight = hweight32(correspondants);
247 if (weight > 1)
248 return i + 1;
249 }
250
251 return 0;
252}
253
254static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
255{
256 int i;
257
258 /* Find the the index of extcon cable in edev->supported_cable */
259 for (i = 0; i < edev->max_supported; i++) {
260 if (edev->supported_cable[i] == id)
261 return i;
262 }
263
264 return -EINVAL;
265}
266
267static int get_extcon_type(unsigned int prop)
268{
269 switch (prop) {
270 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
271 return EXTCON_TYPE_USB;
272 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
273 return EXTCON_TYPE_CHG;
274 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
275 return EXTCON_TYPE_JACK;
276 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
277 return EXTCON_TYPE_DISP;
278 default:
279 return -EINVAL;
280 }
281}
282
283static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
284{
285 return !!(edev->state & BIT(index));
286}
287
288static bool is_extcon_changed(struct extcon_dev *edev, int index,
289 bool new_state)
290{
291 int state = !!(edev->state & BIT(index));
292 return (state != new_state);
293}
294
295static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
296{
297 int type;
298
299 /* Check whether the property is supported or not. */
300 type = get_extcon_type(prop);
301 if (type < 0)
302 return false;
303
304 /* Check whether a specific extcon id supports the property or not. */
305 return !!(extcon_info[id].type & type);
306}
307
308static int is_extcon_property_capability(struct extcon_dev *edev,
309 unsigned int id, int index,unsigned int prop)
310{
311 struct extcon_cable *cable;
312 int type, ret;
313
314 /* Check whether the property is supported or not. */
315 type = get_extcon_type(prop);
316 if (type < 0)
317 return type;
318
319 cable = &edev->cables[index];
320
321 switch (type) {
322 case EXTCON_TYPE_USB:
323 ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
324 break;
325 case EXTCON_TYPE_CHG:
326 ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
327 break;
328 case EXTCON_TYPE_JACK:
329 ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
330 break;
331 case EXTCON_TYPE_DISP:
332 ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
333 break;
334 default:
335 ret = -EINVAL;
336 }
337
338 return ret;
339}
340
341static void init_property(struct extcon_dev *edev, unsigned int id, int index)
342{
343 unsigned int type = extcon_info[id].type;
344 struct extcon_cable *cable = &edev->cables[index];
345
346 if (EXTCON_TYPE_USB & type)
347 memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
348 if (EXTCON_TYPE_CHG & type)
349 memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
350 if (EXTCON_TYPE_JACK & type)
351 memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
352 if (EXTCON_TYPE_DISP & type)
353 memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
354}
355
356static ssize_t state_show(struct device *dev, struct device_attribute *attr,
357 char *buf)
358{
359 int i, count = 0;
360 struct extcon_dev *edev = dev_get_drvdata(dev);
361
362 if (edev->max_supported == 0)
363 return sprintf(buf, "%u\n", edev->state);
364
365 for (i = 0; i < edev->max_supported; i++) {
366 count += sprintf(buf + count, "%s=%d\n",
367 extcon_info[edev->supported_cable[i]].name,
368 !!(edev->state & BIT(i)));
369 }
370
371 return count;
372}
373static DEVICE_ATTR_RO(state);
374
375static ssize_t name_show(struct device *dev, struct device_attribute *attr,
376 char *buf)
377{
378 struct extcon_dev *edev = dev_get_drvdata(dev);
379
380 return sprintf(buf, "%s\n", edev->name);
381}
382static DEVICE_ATTR_RO(name);
383
384static ssize_t cable_name_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
386{
387 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
388 attr_name);
389 int i = cable->cable_index;
390
391 return sprintf(buf, "%s\n",
392 extcon_info[cable->edev->supported_cable[i]].name);
393}
394
395static ssize_t cable_state_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
399 attr_state);
400
401 int i = cable->cable_index;
402
403 return sprintf(buf, "%d\n",
404 extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
405}
406
407/**
408 * extcon_sync() - Synchronize the state for an external connector.
409 * @edev: the extcon device
410 *
411 * Note that this function send a notification in order to synchronize
412 * the state and property of an external connector.
413 *
414 * Returns 0 if success or error number if fail.
415 */
416int extcon_sync(struct extcon_dev *edev, unsigned int id)
417{
418 char name_buf[120];
419 char state_buf[120];
420 char *prop_buf;
421 char *envp[3];
422 int env_offset = 0;
423 int length;
424 int index;
425 int state;
426 unsigned long flags;
427
428 if (!edev)
429 return -EINVAL;
430
431 index = find_cable_index_by_id(edev, id);
432 if (index < 0)
433 return index;
434
435 spin_lock_irqsave(&edev->lock, flags);
436
437 state = !!(edev->state & BIT(index));
438
439 /*
440 * Call functions in a raw notifier chain for the specific one
441 * external connector.
442 */
443 raw_notifier_call_chain(&edev->nh[index], state, edev);
444
445 /*
446 * Call functions in a raw notifier chain for the all supported
447 * external connectors.
448 */
449 raw_notifier_call_chain(&edev->nh_all, state, edev);
450
451 /* This could be in interrupt handler */
452 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
453 if (!prop_buf) {
454 /* Unlock early before uevent */
455 spin_unlock_irqrestore(&edev->lock, flags);
456
457 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
458 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
459
460 return -ENOMEM;
461 }
462
463 length = name_show(&edev->dev, NULL, prop_buf);
464 if (length > 0) {
465 if (prop_buf[length - 1] == '\n')
466 prop_buf[length - 1] = 0;
467 snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
468 envp[env_offset++] = name_buf;
469 }
470
471 length = state_show(&edev->dev, NULL, prop_buf);
472 if (length > 0) {
473 if (prop_buf[length - 1] == '\n')
474 prop_buf[length - 1] = 0;
475 snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
476 envp[env_offset++] = state_buf;
477 }
478 envp[env_offset] = NULL;
479
480 /* Unlock early before uevent */
481 spin_unlock_irqrestore(&edev->lock, flags);
482 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
483 free_page((unsigned long)prop_buf);
484
485 return 0;
486}
487EXPORT_SYMBOL_GPL(extcon_sync);
488
489/**
490 * extcon_get_state() - Get the state of an external connector.
491 * @edev: the extcon device
492 * @id: the unique id indicating an external connector
493 *
494 * Returns 0 if success or error number if fail.
495 */
496int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
497{
498 int index, state;
499 unsigned long flags;
500
501 if (!edev)
502 return -EINVAL;
503
504 index = find_cable_index_by_id(edev, id);
505 if (index < 0)
506 return index;
507
508 spin_lock_irqsave(&edev->lock, flags);
509 state = is_extcon_attached(edev, index);
510 spin_unlock_irqrestore(&edev->lock, flags);
511
512 return state;
513}
514EXPORT_SYMBOL_GPL(extcon_get_state);
515
516/**
517 * extcon_set_state() - Set the state of an external connector.
518 * @edev: the extcon device
519 * @id: the unique id indicating an external connector
520 * @state: the new state of an external connector.
521 * the default semantics is true: attached / false: detached.
522 *
523 * Note that this function set the state of an external connector without
524 * a notification. To synchronize the state of an external connector,
525 * have to use extcon_set_state_sync() and extcon_sync().
526 *
527 * Returns 0 if success or error number if fail.
528 */
529int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state)
530{
531 unsigned long flags;
532 int index, ret = 0;
533
534 if (!edev)
535 return -EINVAL;
536
537 index = find_cable_index_by_id(edev, id);
538 if (index < 0)
539 return index;
540
541 spin_lock_irqsave(&edev->lock, flags);
542
543 /* Check whether the external connector's state is changed. */
544 if (!is_extcon_changed(edev, index, state))
545 goto out;
546
547 if (check_mutually_exclusive(edev,
548 (edev->state & ~BIT(index)) | (state & BIT(index)))) {
549 ret = -EPERM;
550 goto out;
551 }
552
553 /*
554 * Initialize the value of extcon property before setting
555 * the detached state for an external connector.
556 */
557 if (!state)
558 init_property(edev, id, index);
559
560 /* Update the state for an external connector. */
561 if (state)
562 edev->state |= BIT(index);
563 else
564 edev->state &= ~(BIT(index));
565out:
566 spin_unlock_irqrestore(&edev->lock, flags);
567
568 return ret;
569}
570EXPORT_SYMBOL_GPL(extcon_set_state);
571
572/**
573 * extcon_set_state_sync() - Set the state of an external connector with sync.
574 * @edev: the extcon device
575 * @id: the unique id indicating an external connector
576 * @state: the new state of external connector.
577 * the default semantics is true: attached / false: detached.
578 *
579 * Note that this function set the state of external connector
580 * and synchronize the state by sending a notification.
581 *
582 * Returns 0 if success or error number if fail.
583 */
584int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state)
585{
586 int ret, index;
587 unsigned long flags;
588
589 index = find_cable_index_by_id(edev, id);
590 if (index < 0)
591 return index;
592
593 /* Check whether the external connector's state is changed. */
594 spin_lock_irqsave(&edev->lock, flags);
595 ret = is_extcon_changed(edev, index, state);
596 spin_unlock_irqrestore(&edev->lock, flags);
597 if (!ret)
598 return 0;
599
600 ret = extcon_set_state(edev, id, state);
601 if (ret < 0)
602 return ret;
603
604 return extcon_sync(edev, id);
605}
606EXPORT_SYMBOL_GPL(extcon_set_state_sync);
607
608/**
609 * extcon_get_property() - Get the property value of an external connector.
610 * @edev: the extcon device
611 * @id: the unique id indicating an external connector
612 * @prop: the property id indicating an extcon property
613 * @prop_val: the pointer which store the value of extcon property
614 *
615 * Note that when getting the property value of external connector,
616 * the external connector should be attached. If detached state, function
617 * return 0 without property value. Also, the each property should be
618 * included in the list of supported properties according to extcon type.
619 *
620 * Returns 0 if success or error number if fail.
621 */
622int extcon_get_property(struct extcon_dev *edev, unsigned int id,
623 unsigned int prop,
624 union extcon_property_value *prop_val)
625{
626 struct extcon_cable *cable;
627 unsigned long flags;
628 int index, ret = 0;
629
630 *prop_val = (union extcon_property_value)(0);
631
632 if (!edev)
633 return -EINVAL;
634
635 /* Check whether the property is supported or not */
636 if (!is_extcon_property_supported(id, prop))
637 return -EINVAL;
638
639 /* Find the cable index of external connector by using id */
640 index = find_cable_index_by_id(edev, id);
641 if (index < 0)
642 return index;
643
644 spin_lock_irqsave(&edev->lock, flags);
645
646 /* Check whether the property is available or not. */
647 if (!is_extcon_property_capability(edev, id, index, prop)) {
648 spin_unlock_irqrestore(&edev->lock, flags);
649 return -EPERM;
650 }
651
652 /*
653 * Check whether the external connector is attached.
654 * If external connector is detached, the user can not
655 * get the property value.
656 */
657 if (!is_extcon_attached(edev, index)) {
658 spin_unlock_irqrestore(&edev->lock, flags);
659 return 0;
660 }
661
662 cable = &edev->cables[index];
663
664 /* Get the property value according to extcon type */
665 switch (prop) {
666 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
667 *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
668 break;
669 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
670 *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
671 break;
672 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
673 *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
674 break;
675 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
676 *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
677 break;
678 default:
679 ret = -EINVAL;
680 break;
681 }
682
683 spin_unlock_irqrestore(&edev->lock, flags);
684
685 return ret;
686}
687EXPORT_SYMBOL_GPL(extcon_get_property);
688
689/**
690 * extcon_set_property() - Set the property value of an external connector.
691 * @edev: the extcon device
692 * @id: the unique id indicating an external connector
693 * @prop: the property id indicating an extcon property
694 * @prop_val: the pointer including the new value of extcon property
695 *
696 * Note that each property should be included in the list of supported
697 * properties according to the extcon type.
698 *
699 * Returns 0 if success or error number if fail.
700 */
701int extcon_set_property(struct extcon_dev *edev, unsigned int id,
702 unsigned int prop,
703 union extcon_property_value prop_val)
704{
705 struct extcon_cable *cable;
706 unsigned long flags;
707 int index, ret = 0;
708
709 if (!edev)
710 return -EINVAL;
711
712 /* Check whether the property is supported or not */
713 if (!is_extcon_property_supported(id, prop))
714 return -EINVAL;
715
716 /* Find the cable index of external connector by using id */
717 index = find_cable_index_by_id(edev, id);
718 if (index < 0)
719 return index;
720
721 spin_lock_irqsave(&edev->lock, flags);
722
723 /* Check whether the property is available or not. */
724 if (!is_extcon_property_capability(edev, id, index, prop)) {
725 spin_unlock_irqrestore(&edev->lock, flags);
726 return -EPERM;
727 }
728
729 cable = &edev->cables[index];
730
731 /* Set the property value according to extcon type */
732 switch (prop) {
733 case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
734 cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
735 break;
736 case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
737 cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
738 break;
739 case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
740 cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
741 break;
742 case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
743 cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
744 break;
745 default:
746 ret = -EINVAL;
747 break;
748 }
749
750 spin_unlock_irqrestore(&edev->lock, flags);
751
752 return ret;
753}
754EXPORT_SYMBOL_GPL(extcon_set_property);
755
756/**
757 * extcon_set_property_sync() - Set property of an external connector with sync.
758 * @prop_val: the pointer including the new value of extcon property
759 *
760 * Note that when setting the property value of external connector,
761 * the external connector should be attached. The each property should
762 * be included in the list of supported properties according to extcon type.
763 *
764 * Returns 0 if success or error number if fail.
765 */
766int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
767 unsigned int prop,
768 union extcon_property_value prop_val)
769{
770 int ret;
771
772 ret = extcon_set_property(edev, id, prop, prop_val);
773 if (ret < 0)
774 return ret;
775
776 return extcon_sync(edev, id);
777}
778EXPORT_SYMBOL_GPL(extcon_set_property_sync);
779
780/**
781 * extcon_get_property_capability() - Get the capability of the property
782 * for an external connector.
783 * @edev: the extcon device
784 * @id: the unique id indicating an external connector
785 * @prop: the property id indicating an extcon property
786 *
787 * Returns 1 if the property is available or 0 if not available.
788 */
789int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
790 unsigned int prop)
791{
792 int index;
793
794 if (!edev)
795 return -EINVAL;
796
797 /* Check whether the property is supported or not */
798 if (!is_extcon_property_supported(id, prop))
799 return -EINVAL;
800
801 /* Find the cable index of external connector by using id */
802 index = find_cable_index_by_id(edev, id);
803 if (index < 0)
804 return index;
805
806 return is_extcon_property_capability(edev, id, index, prop);
807}
808EXPORT_SYMBOL_GPL(extcon_get_property_capability);
809
810/**
811 * extcon_set_property_capability() - Set the capability of the property
812 * for an external connector.
813 * @edev: the extcon device
814 * @id: the unique id indicating an external connector
815 * @prop: the property id indicating an extcon property
816 *
817 * Note that this function set the capability of the property
818 * for an external connector in order to mark the bit in capability
819 * bitmap which mean the available state of the property.
820 *
821 * Returns 0 if success or error number if fail.
822 */
823int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
824 unsigned int prop)
825{
826 struct extcon_cable *cable;
827 int index, type, ret = 0;
828
829 if (!edev)
830 return -EINVAL;
831
832 /* Check whether the property is supported or not. */
833 if (!is_extcon_property_supported(id, prop))
834 return -EINVAL;
835
836 /* Find the cable index of external connector by using id. */
837 index = find_cable_index_by_id(edev, id);
838 if (index < 0)
839 return index;
840
841 type = get_extcon_type(prop);
842 if (type < 0)
843 return type;
844
845 cable = &edev->cables[index];
846
847 switch (type) {
848 case EXTCON_TYPE_USB:
849 __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
850 break;
851 case EXTCON_TYPE_CHG:
852 __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
853 break;
854 case EXTCON_TYPE_JACK:
855 __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
856 break;
857 case EXTCON_TYPE_DISP:
858 __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
859 break;
860 default:
861 ret = -EINVAL;
862 }
863
864 return ret;
865}
866EXPORT_SYMBOL_GPL(extcon_set_property_capability);
867
868/**
869 * extcon_get_extcon_dev() - Get the extcon device instance from the name.
870 * @extcon_name: the extcon name provided with extcon_dev_register()
871 *
872 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
873 */
874struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
875{
876 struct extcon_dev *sd;
877
878 if (!extcon_name)
879 return ERR_PTR(-EINVAL);
880
881 mutex_lock(&extcon_dev_list_lock);
882 list_for_each_entry(sd, &extcon_dev_list, entry) {
883 if (!strcmp(sd->name, extcon_name))
884 goto out;
885 }
886 sd = NULL;
887out:
888 mutex_unlock(&extcon_dev_list_lock);
889 return sd;
890}
891EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
892
893/**
894 * extcon_register_notifier() - Register a notifier block to get notified by
895 * any state changes from the extcon.
896 * @edev: the extcon device
897 * @id: the unique id indicating an external connector
898 * @nb: a notifier block to be registered
899 *
900 * Note that the second parameter given to the callback of nb (val) is
901 * the current state of an external connector and the third pameter
902 * is the pointer of extcon device.
903 *
904 * Returns 0 if success or error number if fail.
905 */
906int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
907 struct notifier_block *nb)
908{
909 unsigned long flags;
910 int ret, idx = -EINVAL;
911
912 if (!edev || !nb)
913 return -EINVAL;
914
915 idx = find_cable_index_by_id(edev, id);
916 if (idx < 0)
917 return idx;
918
919 spin_lock_irqsave(&edev->lock, flags);
920 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
921 spin_unlock_irqrestore(&edev->lock, flags);
922
923 return ret;
924}
925EXPORT_SYMBOL_GPL(extcon_register_notifier);
926
927/**
928 * extcon_unregister_notifier() - Unregister a notifier block from the extcon.
929 * @edev: the extcon device
930 * @id: the unique id indicating an external connector
931 * @nb: a notifier block to be registered
932 *
933 * Returns 0 if success or error number if fail.
934 */
935int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
936 struct notifier_block *nb)
937{
938 unsigned long flags;
939 int ret, idx;
940
941 if (!edev || !nb)
942 return -EINVAL;
943
944 idx = find_cable_index_by_id(edev, id);
945 if (idx < 0)
946 return idx;
947
948 spin_lock_irqsave(&edev->lock, flags);
949 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
950 spin_unlock_irqrestore(&edev->lock, flags);
951
952 return ret;
953}
954EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
955
956/**
957 * extcon_register_notifier_all() - Register a notifier block for all connectors.
958 * @edev: the extcon device
959 * @nb: a notifier block to be registered
960 *
961 * Note that this function registers a notifier block in order to receive
962 * the state change of all supported external connectors from extcon device.
963 * And the second parameter given to the callback of nb (val) is
964 * the current state and the third pameter is the pointer of extcon device.
965 *
966 * Returns 0 if success or error number if fail.
967 */
968int extcon_register_notifier_all(struct extcon_dev *edev,
969 struct notifier_block *nb)
970{
971 unsigned long flags;
972 int ret;
973
974 if (!edev || !nb)
975 return -EINVAL;
976
977 spin_lock_irqsave(&edev->lock, flags);
978 ret = raw_notifier_chain_register(&edev->nh_all, nb);
979 spin_unlock_irqrestore(&edev->lock, flags);
980
981 return ret;
982}
983EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
984
985/**
986 * extcon_unregister_notifier_all() - Unregister a notifier block from extcon.
987 * @edev: the extcon device
988 * @nb: a notifier block to be registered
989 *
990 * Returns 0 if success or error number if fail.
991 */
992int extcon_unregister_notifier_all(struct extcon_dev *edev,
993 struct notifier_block *nb)
994{
995 unsigned long flags;
996 int ret;
997
998 if (!edev || !nb)
999 return -EINVAL;
1000
1001 spin_lock_irqsave(&edev->lock, flags);
1002 ret = raw_notifier_chain_unregister(&edev->nh_all, nb);
1003 spin_unlock_irqrestore(&edev->lock, flags);
1004
1005 return ret;
1006}
1007EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
1008
1009static struct attribute *extcon_attrs[] = {
1010 &dev_attr_state.attr,
1011 &dev_attr_name.attr,
1012 NULL,
1013};
1014ATTRIBUTE_GROUPS(extcon);
1015
1016static int create_extcon_class(void)
1017{
1018 if (!extcon_class) {
1019 extcon_class = class_create(THIS_MODULE, "extcon");
1020 if (IS_ERR(extcon_class))
1021 return PTR_ERR(extcon_class);
1022 extcon_class->dev_groups = extcon_groups;
1023 }
1024
1025 return 0;
1026}
1027
1028static void extcon_dev_release(struct device *dev)
1029{
1030}
1031
1032static const char *muex_name = "mutually_exclusive";
1033static void dummy_sysfs_dev_release(struct device *dev)
1034{
1035}
1036
1037/*
1038 * extcon_dev_allocate() - Allocate the memory of extcon device.
1039 * @supported_cable: the array of the supported external connectors
1040 * ending with EXTCON_NONE.
1041 *
1042 * Note that this function allocates the memory for extcon device
1043 * and initialize default setting for the extcon device.
1044 *
1045 * Returns the pointer memory of allocated extcon_dev if success
1046 * or ERR_PTR(err) if fail.
1047 */
1048struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
1049{
1050 struct extcon_dev *edev;
1051
1052 if (!supported_cable)
1053 return ERR_PTR(-EINVAL);
1054
1055 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
1056 if (!edev)
1057 return ERR_PTR(-ENOMEM);
1058
1059 edev->max_supported = 0;
1060 edev->supported_cable = supported_cable;
1061
1062 return edev;
1063}
1064
1065/*
1066 * extcon_dev_free() - Free the memory of extcon device.
1067 * @edev: the extcon device
1068 */
1069void extcon_dev_free(struct extcon_dev *edev)
1070{
1071 kfree(edev);
1072}
1073EXPORT_SYMBOL_GPL(extcon_dev_free);
1074
1075/**
1076 * extcon_dev_register() - Register an new extcon device
1077 * @edev: the extcon device to be registered
1078 *
1079 * Among the members of edev struct, please set the "user initializing data"
1080 * do not set the values of "internal data", which are initialized by
1081 * this function.
1082 *
1083 * Note that before calling this funciton, have to allocate the memory
1084 * of an extcon device by using the extcon_dev_allocate(). And the extcon
1085 * dev should include the supported_cable information.
1086 *
1087 * Returns 0 if success or error number if fail.
1088 */
1089int extcon_dev_register(struct extcon_dev *edev)
1090{
1091 int ret, index = 0;
1092 static atomic_t edev_no = ATOMIC_INIT(-1);
1093
1094 if (!extcon_class) {
1095 ret = create_extcon_class();
1096 if (ret < 0)
1097 return ret;
1098 }
1099
1100 if (!edev || !edev->supported_cable)
1101 return -EINVAL;
1102
1103 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
1104
1105 edev->max_supported = index;
1106 if (index > SUPPORTED_CABLE_MAX) {
1107 dev_err(&edev->dev,
1108 "exceed the maximum number of supported cables\n");
1109 return -EINVAL;
1110 }
1111
1112 edev->dev.class = extcon_class;
1113 edev->dev.release = extcon_dev_release;
1114
1115 edev->name = dev_name(edev->dev.parent);
1116 if (IS_ERR_OR_NULL(edev->name)) {
1117 dev_err(&edev->dev,
1118 "extcon device name is null\n");
1119 return -EINVAL;
1120 }
1121 dev_set_name(&edev->dev, "extcon%lu",
1122 (unsigned long)atomic_inc_return(&edev_no));
1123
1124 if (edev->max_supported) {
1125 char buf[10];
1126 char *str;
1127 struct extcon_cable *cable;
1128
1129 edev->cables = kzalloc(sizeof(struct extcon_cable) *
1130 edev->max_supported, GFP_KERNEL);
1131 if (!edev->cables) {
1132 ret = -ENOMEM;
1133 goto err_sysfs_alloc;
1134 }
1135 for (index = 0; index < edev->max_supported; index++) {
1136 cable = &edev->cables[index];
1137
1138 snprintf(buf, 10, "cable.%d", index);
1139 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
1140 GFP_KERNEL);
1141 if (!str) {
1142 for (index--; index >= 0; index--) {
1143 cable = &edev->cables[index];
1144 kfree(cable->attr_g.name);
1145 }
1146 ret = -ENOMEM;
1147
1148 goto err_alloc_cables;
1149 }
1150 strcpy(str, buf);
1151
1152 cable->edev = edev;
1153 cable->cable_index = index;
1154 cable->attrs[0] = &cable->attr_name.attr;
1155 cable->attrs[1] = &cable->attr_state.attr;
1156 cable->attrs[2] = NULL;
1157 cable->attr_g.name = str;
1158 cable->attr_g.attrs = cable->attrs;
1159
1160 sysfs_attr_init(&cable->attr_name.attr);
1161 cable->attr_name.attr.name = "name";
1162 cable->attr_name.attr.mode = 0444;
1163 cable->attr_name.show = cable_name_show;
1164
1165 sysfs_attr_init(&cable->attr_state.attr);
1166 cable->attr_state.attr.name = "state";
1167 cable->attr_state.attr.mode = 0444;
1168 cable->attr_state.show = cable_state_show;
1169 }
1170 }
1171
1172 if (edev->max_supported && edev->mutually_exclusive) {
1173 char buf[80];
1174 char *name;
1175
1176 /* Count the size of mutually_exclusive array */
1177 for (index = 0; edev->mutually_exclusive[index]; index++)
1178 ;
1179
1180 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
1181 (index + 1), GFP_KERNEL);
1182 if (!edev->attrs_muex) {
1183 ret = -ENOMEM;
1184 goto err_muex;
1185 }
1186
1187 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
1188 index, GFP_KERNEL);
1189 if (!edev->d_attrs_muex) {
1190 ret = -ENOMEM;
1191 kfree(edev->attrs_muex);
1192 goto err_muex;
1193 }
1194
1195 for (index = 0; edev->mutually_exclusive[index]; index++) {
1196 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
1197 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
1198 GFP_KERNEL);
1199 if (!name) {
1200 for (index--; index >= 0; index--) {
1201 kfree(edev->d_attrs_muex[index].attr.
1202 name);
1203 }
1204 kfree(edev->d_attrs_muex);
1205 kfree(edev->attrs_muex);
1206 ret = -ENOMEM;
1207 goto err_muex;
1208 }
1209 strcpy(name, buf);
1210 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
1211 edev->d_attrs_muex[index].attr.name = name;
1212 edev->d_attrs_muex[index].attr.mode = 0000;
1213 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
1214 .attr;
1215 }
1216 edev->attr_g_muex.name = muex_name;
1217 edev->attr_g_muex.attrs = edev->attrs_muex;
1218
1219 }
1220
1221 if (edev->max_supported) {
1222 edev->extcon_dev_type.groups =
1223 kzalloc(sizeof(struct attribute_group *) *
1224 (edev->max_supported + 2), GFP_KERNEL);
1225 if (!edev->extcon_dev_type.groups) {
1226 ret = -ENOMEM;
1227 goto err_alloc_groups;
1228 }
1229
1230 edev->extcon_dev_type.name = dev_name(&edev->dev);
1231 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
1232
1233 for (index = 0; index < edev->max_supported; index++)
1234 edev->extcon_dev_type.groups[index] =
1235 &edev->cables[index].attr_g;
1236 if (edev->mutually_exclusive)
1237 edev->extcon_dev_type.groups[index] =
1238 &edev->attr_g_muex;
1239
1240 edev->dev.type = &edev->extcon_dev_type;
1241 }
1242
1243 ret = device_register(&edev->dev);
1244 if (ret) {
1245 put_device(&edev->dev);
1246 goto err_dev;
1247 }
1248
1249 spin_lock_init(&edev->lock);
1250 edev->nh = devm_kcalloc(&edev->dev, edev->max_supported,
1251 sizeof(*edev->nh), GFP_KERNEL);
1252 if (!edev->nh) {
1253 ret = -ENOMEM;
1254 goto err_dev;
1255 }
1256
1257 for (index = 0; index < edev->max_supported; index++)
1258 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
1259
1260 RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
1261
1262 dev_set_drvdata(&edev->dev, edev);
1263 edev->state = 0;
1264
1265 mutex_lock(&extcon_dev_list_lock);
1266 list_add(&edev->entry, &extcon_dev_list);
1267 mutex_unlock(&extcon_dev_list_lock);
1268
1269 return 0;
1270
1271err_dev:
1272 if (edev->max_supported)
1273 kfree(edev->extcon_dev_type.groups);
1274err_alloc_groups:
1275 if (edev->max_supported && edev->mutually_exclusive) {
1276 for (index = 0; edev->mutually_exclusive[index]; index++)
1277 kfree(edev->d_attrs_muex[index].attr.name);
1278 kfree(edev->d_attrs_muex);
1279 kfree(edev->attrs_muex);
1280 }
1281err_muex:
1282 for (index = 0; index < edev->max_supported; index++)
1283 kfree(edev->cables[index].attr_g.name);
1284err_alloc_cables:
1285 if (edev->max_supported)
1286 kfree(edev->cables);
1287err_sysfs_alloc:
1288 return ret;
1289}
1290EXPORT_SYMBOL_GPL(extcon_dev_register);
1291
1292/**
1293 * extcon_dev_unregister() - Unregister the extcon device.
1294 * @edev: the extcon device to be unregistered.
1295 *
1296 * Note that this does not call kfree(edev) because edev was not allocated
1297 * by this class.
1298 */
1299void extcon_dev_unregister(struct extcon_dev *edev)
1300{
1301 int index;
1302
1303 if (!edev)
1304 return;
1305
1306 mutex_lock(&extcon_dev_list_lock);
1307 list_del(&edev->entry);
1308 mutex_unlock(&extcon_dev_list_lock);
1309
1310 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
1311 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
1312 dev_name(&edev->dev));
1313 return;
1314 }
1315
1316 device_unregister(&edev->dev);
1317
1318 if (edev->mutually_exclusive && edev->max_supported) {
1319 for (index = 0; edev->mutually_exclusive[index];
1320 index++)
1321 kfree(edev->d_attrs_muex[index].attr.name);
1322 kfree(edev->d_attrs_muex);
1323 kfree(edev->attrs_muex);
1324 }
1325
1326 for (index = 0; index < edev->max_supported; index++)
1327 kfree(edev->cables[index].attr_g.name);
1328
1329 if (edev->max_supported) {
1330 kfree(edev->extcon_dev_type.groups);
1331 kfree(edev->cables);
1332 }
1333
1334 put_device(&edev->dev);
1335}
1336EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1337
1338#ifdef CONFIG_OF
1339
1340/*
1341 * extcon_find_edev_by_node - Find the extcon device from devicetree.
1342 * @node : OF node identifying edev
1343 *
1344 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1345 */
1346struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1347{
1348 struct extcon_dev *edev;
1349
1350 mutex_lock(&extcon_dev_list_lock);
1351 list_for_each_entry(edev, &extcon_dev_list, entry)
1352 if (edev->dev.parent && edev->dev.parent->of_node == node)
1353 goto out;
1354 edev = ERR_PTR(-EPROBE_DEFER);
1355out:
1356 mutex_unlock(&extcon_dev_list_lock);
1357
1358 return edev;
1359}
1360
1361/*
1362 * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
1363 * @dev : the instance to the given device
1364 * @index : the index into list of extcon_dev
1365 *
1366 * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
1367 */
1368struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1369{
1370 struct device_node *node;
1371 struct extcon_dev *edev;
1372
1373 if (!dev)
1374 return ERR_PTR(-EINVAL);
1375
1376 if (!dev->of_node) {
1377 dev_dbg(dev, "device does not have a device node entry\n");
1378 return ERR_PTR(-EINVAL);
1379 }
1380
1381 node = of_parse_phandle(dev->of_node, "extcon", index);
1382 if (!node) {
1383 dev_dbg(dev, "failed to get phandle in %pOF node\n",
1384 dev->of_node);
1385 return ERR_PTR(-ENODEV);
1386 }
1387
1388 edev = extcon_find_edev_by_node(node);
1389 of_node_put(node);
1390
1391 return edev;
1392}
1393
1394#else
1395
1396struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
1397{
1398 return ERR_PTR(-ENOSYS);
1399}
1400
1401struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1402{
1403 return ERR_PTR(-ENOSYS);
1404}
1405
1406#endif /* CONFIG_OF */
1407
1408EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
1409EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1410
1411/**
1412 * extcon_get_edev_name() - Get the name of the extcon device.
1413 * @edev: the extcon device
1414 */
1415const char *extcon_get_edev_name(struct extcon_dev *edev)
1416{
1417 return !edev ? NULL : edev->name;
1418}
1419
1420static int __init extcon_class_init(void)
1421{
1422 return create_extcon_class();
1423}
1424module_init(extcon_class_init);
1425
1426static void __exit extcon_class_exit(void)
1427{
1428 class_destroy(extcon_class);
1429}
1430module_exit(extcon_class_exit);
1431
1432MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1433MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1434MODULE_DESCRIPTION("External Connector (extcon) framework");
1435MODULE_LICENSE("GPL v2");