Root/drivers/extcon/extcon_class.c

1/*
2 * drivers/extcon/extcon_class.c
3 *
4 * External connector (extcon) class driver
5 *
6 * Copyright (C) 2012 Samsung Electronics
7 * Author: Donggeun Kim <dg77.kim@samsung.com>
8 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
9 *
10 * based on android/drivers/switch/switch_class.c
11 * Copyright (C) 2008 Google, Inc.
12 * Author: Mike Lockwood <lockwood@android.com>
13 *
14 * This software is licensed under the terms of the GNU General Public
15 * License version 2, as published by the Free Software Foundation, and
16 * may be copied, distributed, and modified under those terms.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
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/extcon.h>
32#include <linux/slab.h>
33
34/*
35 * extcon_cable_name suggests the standard cable names for commonly used
36 * cable types.
37 *
38 * However, please do not use extcon_cable_name directly for extcon_dev
39 * struct's supported_cable pointer unless your device really supports
40 * every single port-type of the following cable names. Please choose cable
41 * names that are actually used in your extcon device.
42 */
43const char *extcon_cable_name[] = {
44    [EXTCON_USB] = "USB",
45    [EXTCON_USB_HOST] = "USB-Host",
46    [EXTCON_TA] = "TA",
47    [EXTCON_FAST_CHARGER] = "Fast-charger",
48    [EXTCON_SLOW_CHARGER] = "Slow-charger",
49    [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream",
50    [EXTCON_HDMI] = "HDMI",
51    [EXTCON_MHL] = "MHL",
52    [EXTCON_DVI] = "DVI",
53    [EXTCON_VGA] = "VGA",
54    [EXTCON_DOCK] = "Dock",
55    [EXTCON_LINE_IN] = "Line-in",
56    [EXTCON_LINE_OUT] = "Line-out",
57    [EXTCON_MIC_IN] = "Microphone",
58    [EXTCON_HEADPHONE_OUT] = "Headphone",
59    [EXTCON_SPDIF_IN] = "SPDIF-in",
60    [EXTCON_SPDIF_OUT] = "SPDIF-out",
61    [EXTCON_VIDEO_IN] = "Video-in",
62    [EXTCON_VIDEO_OUT] = "Video-out",
63    [EXTCON_MECHANICAL] = "Mechanical",
64
65    NULL,
66};
67
68static struct class *extcon_class;
69#if defined(CONFIG_ANDROID)
70static struct class_compat *switch_class;
71#endif /* CONFIG_ANDROID */
72
73static LIST_HEAD(extcon_dev_list);
74static DEFINE_MUTEX(extcon_dev_list_lock);
75
76/**
77 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
78 * condition.
79 * @edev: the extcon device
80 * @new_state: new cable attach status for @edev
81 *
82 * Returns 0 if nothing violates. Returns the index + 1 for the first
83 * violated condition.
84 */
85static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
86{
87    int i = 0;
88
89    if (!edev->mutually_exclusive)
90        return 0;
91
92    for (i = 0; edev->mutually_exclusive[i]; i++) {
93        int count = 0, j;
94        u32 correspondants = new_state & edev->mutually_exclusive[i];
95        u32 exp = 1;
96
97        for (j = 0; j < 32; j++) {
98            if (exp & correspondants)
99                count++;
100            if (count > 1)
101                return i + 1;
102            exp <<= 1;
103        }
104    }
105
106    return 0;
107}
108
109static ssize_t state_show(struct device *dev, struct device_attribute *attr,
110              char *buf)
111{
112    int i, count = 0;
113    struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev);
114
115    if (edev->print_state) {
116        int ret = edev->print_state(edev, buf);
117
118        if (ret >= 0)
119            return ret;
120        /* Use default if failed */
121    }
122
123    if (edev->max_supported == 0)
124        return sprintf(buf, "%u\n", edev->state);
125
126    for (i = 0; i < SUPPORTED_CABLE_MAX; i++) {
127        if (!edev->supported_cable[i])
128            break;
129        count += sprintf(buf + count, "%s=%d\n",
130                 edev->supported_cable[i],
131                 !!(edev->state & (1 << i)));
132    }
133
134    return count;
135}
136
137int extcon_set_state(struct extcon_dev *edev, u32 state);
138static ssize_t state_store(struct device *dev, struct device_attribute *attr,
139               const char *buf, size_t count)
140{
141    u32 state;
142    ssize_t ret = 0;
143    struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev);
144
145    ret = sscanf(buf, "0x%x", &state);
146    if (ret == 0)
147        ret = -EINVAL;
148    else
149        ret = extcon_set_state(edev, state);
150
151    if (ret < 0)
152        return ret;
153
154    return count;
155}
156
157static ssize_t name_show(struct device *dev, struct device_attribute *attr,
158        char *buf)
159{
160    struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev);
161
162    /* Optional callback given by the user */
163    if (edev->print_name) {
164        int ret = edev->print_name(edev, buf);
165        if (ret >= 0)
166            return ret;
167    }
168
169    return sprintf(buf, "%s\n", dev_name(edev->dev));
170}
171
172static ssize_t cable_name_show(struct device *dev,
173                   struct device_attribute *attr, char *buf)
174{
175    struct extcon_cable *cable = container_of(attr, struct extcon_cable,
176                          attr_name);
177
178    return sprintf(buf, "%s\n",
179               cable->edev->supported_cable[cable->cable_index]);
180}
181
182static ssize_t cable_state_show(struct device *dev,
183                struct device_attribute *attr, char *buf)
184{
185    struct extcon_cable *cable = container_of(attr, struct extcon_cable,
186                          attr_state);
187
188    return sprintf(buf, "%d\n",
189               extcon_get_cable_state_(cable->edev,
190                           cable->cable_index));
191}
192
193static ssize_t cable_state_store(struct device *dev,
194                 struct device_attribute *attr, const char *buf,
195                 size_t count)
196{
197    struct extcon_cable *cable = container_of(attr, struct extcon_cable,
198                          attr_state);
199    int ret, state;
200
201    ret = sscanf(buf, "%d", &state);
202    if (ret == 0)
203        ret = -EINVAL;
204    else
205        ret = extcon_set_cable_state_(cable->edev, cable->cable_index,
206                          state);
207
208    if (ret < 0)
209        return ret;
210    return count;
211}
212
213/**
214 * extcon_update_state() - Update the cable attach states of the extcon device
215 * only for the masked bits.
216 * @edev: the extcon device
217 * @mask: the bit mask to designate updated bits.
218 * @state: new cable attach status for @edev
219 *
220 * Changing the state sends uevent with environment variable containing
221 * the name of extcon device (envp[0]) and the state output (envp[1]).
222 * Tizen uses this format for extcon device to get events from ports.
223 * Android uses this format as well.
224 *
225 * Note that the notifier provides which bits are changed in the state
226 * variable with the val parameter (second) to the callback.
227 */
228int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
229{
230    char name_buf[120];
231    char state_buf[120];
232    char *prop_buf;
233    char *envp[3];
234    int env_offset = 0;
235    int length;
236    unsigned long flags;
237
238    spin_lock_irqsave(&edev->lock, flags);
239
240    if (edev->state != ((edev->state & ~mask) | (state & mask))) {
241        u32 old_state = edev->state;
242
243        if (check_mutually_exclusive(edev, (edev->state & ~mask) |
244                           (state & mask))) {
245            spin_unlock_irqrestore(&edev->lock, flags);
246            return -EPERM;
247        }
248
249        edev->state &= ~mask;
250        edev->state |= state & mask;
251
252        raw_notifier_call_chain(&edev->nh, old_state, edev);
253
254        /* This could be in interrupt handler */
255        prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
256        if (prop_buf) {
257            length = name_show(edev->dev, NULL, prop_buf);
258            if (length > 0) {
259                if (prop_buf[length - 1] == '\n')
260                    prop_buf[length - 1] = 0;
261                snprintf(name_buf, sizeof(name_buf),
262                    "NAME=%s", prop_buf);
263                envp[env_offset++] = name_buf;
264            }
265            length = state_show(edev->dev, NULL, prop_buf);
266            if (length > 0) {
267                if (prop_buf[length - 1] == '\n')
268                    prop_buf[length - 1] = 0;
269                snprintf(state_buf, sizeof(state_buf),
270                    "STATE=%s", prop_buf);
271                envp[env_offset++] = state_buf;
272            }
273            envp[env_offset] = NULL;
274            /* Unlock early before uevent */
275            spin_unlock_irqrestore(&edev->lock, flags);
276
277            kobject_uevent_env(&edev->dev->kobj, KOBJ_CHANGE, envp);
278            free_page((unsigned long)prop_buf);
279        } else {
280            /* Unlock early before uevent */
281            spin_unlock_irqrestore(&edev->lock, flags);
282
283            dev_err(edev->dev, "out of memory in extcon_set_state\n");
284            kobject_uevent(&edev->dev->kobj, KOBJ_CHANGE);
285        }
286    } else {
287        /* No changes */
288        spin_unlock_irqrestore(&edev->lock, flags);
289    }
290
291    return 0;
292}
293EXPORT_SYMBOL_GPL(extcon_update_state);
294
295/**
296 * extcon_set_state() - Set the cable attach states of the extcon device.
297 * @edev: the extcon device
298 * @state: new cable attach status for @edev
299 *
300 * Note that notifier provides which bits are changed in the state
301 * variable with the val parameter (second) to the callback.
302 */
303int extcon_set_state(struct extcon_dev *edev, u32 state)
304{
305    return extcon_update_state(edev, 0xffffffff, state);
306}
307EXPORT_SYMBOL_GPL(extcon_set_state);
308
309/**
310 * extcon_find_cable_index() - Get the cable index based on the cable name.
311 * @edev: the extcon device that has the cable.
312 * @cable_name: cable name to be searched.
313 *
314 * Note that accessing a cable state based on cable_index is faster than
315 * cable_name because using cable_name induces a loop with strncmp().
316 * Thus, when get/set_cable_state is repeatedly used, using cable_index
317 * is recommended.
318 */
319int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
320{
321    int i;
322
323    if (edev->supported_cable) {
324        for (i = 0; edev->supported_cable[i]; i++) {
325            if (!strncmp(edev->supported_cable[i],
326                cable_name, CABLE_NAME_MAX))
327                return i;
328        }
329    }
330
331    return -EINVAL;
332}
333EXPORT_SYMBOL_GPL(extcon_find_cable_index);
334
335/**
336 * extcon_get_cable_state_() - Get the status of a specific cable.
337 * @edev: the extcon device that has the cable.
338 * @index: cable index that can be retrieved by extcon_find_cable_index().
339 */
340int extcon_get_cable_state_(struct extcon_dev *edev, int index)
341{
342    if (index < 0 || (edev->max_supported && edev->max_supported <= index))
343        return -EINVAL;
344
345    return !!(edev->state & (1 << index));
346}
347EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
348
349/**
350 * extcon_get_cable_state() - Get the status of a specific cable.
351 * @edev: the extcon device that has the cable.
352 * @cable_name: cable name.
353 *
354 * Note that this is slower than extcon_get_cable_state_.
355 */
356int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
357{
358    return extcon_get_cable_state_(edev, extcon_find_cable_index
359                        (edev, cable_name));
360}
361EXPORT_SYMBOL_GPL(extcon_get_cable_state);
362
363/**
364 * extcon_get_cable_state_() - Set the status of a specific cable.
365 * @edev: the extcon device that has the cable.
366 * @index: cable index that can be retrieved by extcon_find_cable_index().
367 * @cable_state: the new cable status. The default semantics is
368 * true: attached / false: detached.
369 */
370int extcon_set_cable_state_(struct extcon_dev *edev,
371            int index, bool cable_state)
372{
373    u32 state;
374
375    if (index < 0 || (edev->max_supported && edev->max_supported <= index))
376        return -EINVAL;
377
378    state = cable_state ? (1 << index) : 0;
379    return extcon_update_state(edev, 1 << index, state);
380}
381EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
382
383/**
384 * extcon_get_cable_state() - Set the status of a specific cable.
385 * @edev: the extcon device that has the cable.
386 * @cable_name: cable name.
387 * @cable_state: the new cable status. The default semantics is
388 * true: attached / false: detached.
389 *
390 * Note that this is slower than extcon_set_cable_state_.
391 */
392int extcon_set_cable_state(struct extcon_dev *edev,
393            const char *cable_name, bool cable_state)
394{
395    return extcon_set_cable_state_(edev, extcon_find_cable_index
396                    (edev, cable_name), cable_state);
397}
398EXPORT_SYMBOL_GPL(extcon_set_cable_state);
399
400/**
401 * extcon_get_extcon_dev() - Get the extcon device instance from the name
402 * @extcon_name: The extcon name provided with extcon_dev_register()
403 */
404struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
405{
406    struct extcon_dev *sd;
407
408    mutex_lock(&extcon_dev_list_lock);
409    list_for_each_entry(sd, &extcon_dev_list, entry) {
410        if (!strcmp(sd->name, extcon_name))
411            goto out;
412    }
413    sd = NULL;
414out:
415    mutex_unlock(&extcon_dev_list_lock);
416    return sd;
417}
418EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
419
420static int _call_per_cable(struct notifier_block *nb, unsigned long val,
421               void *ptr)
422{
423    struct extcon_specific_cable_nb *obj = container_of(nb,
424            struct extcon_specific_cable_nb, internal_nb);
425    struct extcon_dev *edev = ptr;
426
427    if ((val & (1 << obj->cable_index)) !=
428        (edev->state & (1 << obj->cable_index))) {
429        bool cable_state = true;
430
431        obj->previous_value = val;
432
433        if (val & (1 << obj->cable_index))
434            cable_state = false;
435
436        return obj->user_nb->notifier_call(obj->user_nb,
437                cable_state, ptr);
438    }
439
440    return NOTIFY_OK;
441}
442
443/**
444 * extcon_register_interest() - Register a notifier for a state change of a
445 * specific cable, not a entier set of cables of a
446 * extcon device.
447 * @obj: an empty extcon_specific_cable_nb object to be returned.
448 * @extcon_name: the name of extcon device.
449 * @cable_name: the target cable name.
450 * @nb: the notifier block to get notified.
451 *
452 * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
453 * the struct for you.
454 *
455 * extcon_register_interest is a helper function for those who want to get
456 * notification for a single specific cable's status change. If a user wants
457 * to get notification for any changes of all cables of a extcon device,
458 * he/she should use the general extcon_register_notifier().
459 *
460 * Note that the second parameter given to the callback of nb (val) is
461 * "old_state", not the current state. The current state can be retrieved
462 * by looking at the third pameter (edev pointer)'s state value.
463 */
464int extcon_register_interest(struct extcon_specific_cable_nb *obj,
465                 const char *extcon_name, const char *cable_name,
466                 struct notifier_block *nb)
467{
468    if (!obj || !extcon_name || !cable_name || !nb)
469        return -EINVAL;
470
471    obj->edev = extcon_get_extcon_dev(extcon_name);
472    if (!obj->edev)
473        return -ENODEV;
474
475    obj->cable_index = extcon_find_cable_index(obj->edev, cable_name);
476    if (obj->cable_index < 0)
477        return -ENODEV;
478
479    obj->user_nb = nb;
480
481    obj->internal_nb.notifier_call = _call_per_cable;
482
483    return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb);
484}
485
486/**
487 * extcon_unregister_interest() - Unregister the notifier registered by
488 * extcon_register_interest().
489 * @obj: the extcon_specific_cable_nb object returned by
490 * extcon_register_interest().
491 */
492int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
493{
494    if (!obj)
495        return -EINVAL;
496
497    return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
498}
499
500/**
501 * extcon_register_notifier() - Register a notifee to get notified by
502 * any attach status changes from the extcon.
503 * @edev: the extcon device.
504 * @nb: a notifier block to be registered.
505 *
506 * Note that the second parameter given to the callback of nb (val) is
507 * "old_state", not the current state. The current state can be retrieved
508 * by looking at the third pameter (edev pointer)'s state value.
509 */
510int extcon_register_notifier(struct extcon_dev *edev,
511            struct notifier_block *nb)
512{
513    return raw_notifier_chain_register(&edev->nh, nb);
514}
515EXPORT_SYMBOL_GPL(extcon_register_notifier);
516
517/**
518 * extcon_unregister_notifier() - Unregister a notifee from the extcon device.
519 * @edev: the extcon device.
520 * @nb: a registered notifier block to be unregistered.
521 */
522int extcon_unregister_notifier(struct extcon_dev *edev,
523            struct notifier_block *nb)
524{
525    return raw_notifier_chain_unregister(&edev->nh, nb);
526}
527EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
528
529static struct device_attribute extcon_attrs[] = {
530    __ATTR(state, S_IRUGO | S_IWUSR, state_show, state_store),
531    __ATTR_RO(name),
532    __ATTR_NULL,
533};
534
535static int create_extcon_class(void)
536{
537    if (!extcon_class) {
538        extcon_class = class_create(THIS_MODULE, "extcon");
539        if (IS_ERR(extcon_class))
540            return PTR_ERR(extcon_class);
541        extcon_class->dev_attrs = extcon_attrs;
542
543#if defined(CONFIG_ANDROID)
544        switch_class = class_compat_register("switch");
545        if (WARN(!switch_class, "cannot allocate"))
546            return -ENOMEM;
547#endif /* CONFIG_ANDROID */
548    }
549
550    return 0;
551}
552
553static void extcon_cleanup(struct extcon_dev *edev, bool skip)
554{
555    mutex_lock(&extcon_dev_list_lock);
556    list_del(&edev->entry);
557    mutex_unlock(&extcon_dev_list_lock);
558
559    if (!skip && get_device(edev->dev)) {
560        int index;
561
562        if (edev->mutually_exclusive && edev->max_supported) {
563            for (index = 0; edev->mutually_exclusive[index];
564                 index++)
565                kfree(edev->d_attrs_muex[index].attr.name);
566            kfree(edev->d_attrs_muex);
567            kfree(edev->attrs_muex);
568        }
569
570        for (index = 0; index < edev->max_supported; index++)
571            kfree(edev->cables[index].attr_g.name);
572
573        if (edev->max_supported) {
574            kfree(edev->extcon_dev_type.groups);
575            kfree(edev->cables);
576        }
577
578        device_unregister(edev->dev);
579        put_device(edev->dev);
580    }
581
582    kfree(edev->dev);
583}
584
585static void extcon_dev_release(struct device *dev)
586{
587    struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev);
588
589    extcon_cleanup(edev, true);
590}
591
592static const char *muex_name = "mutually_exclusive";
593static void dummy_sysfs_dev_release(struct device *dev)
594{
595}
596
597/**
598 * extcon_dev_register() - Register a new extcon device
599 * @edev : the new extcon device (should be allocated before calling)
600 * @dev : the parent device for this extcon device.
601 *
602 * Among the members of edev struct, please set the "user initializing data"
603 * in any case and set the "optional callbacks" if required. However, please
604 * do not set the values of "internal data", which are initialized by
605 * this function.
606 */
607int extcon_dev_register(struct extcon_dev *edev, struct device *dev)
608{
609    int ret, index = 0;
610
611    if (!extcon_class) {
612        ret = create_extcon_class();
613        if (ret < 0)
614            return ret;
615    }
616
617    if (edev->supported_cable) {
618        /* Get size of array */
619        for (index = 0; edev->supported_cable[index]; index++)
620            ;
621        edev->max_supported = index;
622    } else {
623        edev->max_supported = 0;
624    }
625
626    if (index > SUPPORTED_CABLE_MAX) {
627        dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n");
628        return -EINVAL;
629    }
630
631    edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
632    if (!edev->dev)
633        return -ENOMEM;
634    edev->dev->parent = dev;
635    edev->dev->class = extcon_class;
636    edev->dev->release = extcon_dev_release;
637
638    dev_set_name(edev->dev, edev->name ? edev->name : dev_name(dev));
639
640    if (edev->max_supported) {
641        char buf[10];
642        char *str;
643        struct extcon_cable *cable;
644
645        edev->cables = kzalloc(sizeof(struct extcon_cable) *
646                       edev->max_supported, GFP_KERNEL);
647        if (!edev->cables) {
648            ret = -ENOMEM;
649            goto err_sysfs_alloc;
650        }
651        for (index = 0; index < edev->max_supported; index++) {
652            cable = &edev->cables[index];
653
654            snprintf(buf, 10, "cable.%d", index);
655            str = kzalloc(sizeof(char) * (strlen(buf) + 1),
656                      GFP_KERNEL);
657            if (!str) {
658                for (index--; index >= 0; index--) {
659                    cable = &edev->cables[index];
660                    kfree(cable->attr_g.name);
661                }
662                ret = -ENOMEM;
663
664                goto err_alloc_cables;
665            }
666            strcpy(str, buf);
667
668            cable->edev = edev;
669            cable->cable_index = index;
670            cable->attrs[0] = &cable->attr_name.attr;
671            cable->attrs[1] = &cable->attr_state.attr;
672            cable->attrs[2] = NULL;
673            cable->attr_g.name = str;
674            cable->attr_g.attrs = cable->attrs;
675
676            cable->attr_name.attr.name = "name";
677            cable->attr_name.attr.mode = 0444;
678            cable->attr_name.show = cable_name_show;
679
680            cable->attr_state.attr.name = "state";
681            cable->attr_state.attr.mode = 0644;
682            cable->attr_state.show = cable_state_show;
683            cable->attr_state.store = cable_state_store;
684        }
685    }
686
687    if (edev->max_supported && edev->mutually_exclusive) {
688        char buf[80];
689        char *name;
690
691        /* Count the size of mutually_exclusive array */
692        for (index = 0; edev->mutually_exclusive[index]; index++)
693            ;
694
695        edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
696                       (index + 1), GFP_KERNEL);
697        if (!edev->attrs_muex) {
698            ret = -ENOMEM;
699            goto err_muex;
700        }
701
702        edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
703                         index, GFP_KERNEL);
704        if (!edev->d_attrs_muex) {
705            ret = -ENOMEM;
706            kfree(edev->attrs_muex);
707            goto err_muex;
708        }
709
710        for (index = 0; edev->mutually_exclusive[index]; index++) {
711            sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
712            name = kzalloc(sizeof(char) * (strlen(buf) + 1),
713                       GFP_KERNEL);
714            if (!name) {
715                for (index--; index >= 0; index--) {
716                    kfree(edev->d_attrs_muex[index].attr.
717                          name);
718                }
719                kfree(edev->d_attrs_muex);
720                kfree(edev->attrs_muex);
721                ret = -ENOMEM;
722                goto err_muex;
723            }
724            strcpy(name, buf);
725            edev->d_attrs_muex[index].attr.name = name;
726            edev->d_attrs_muex[index].attr.mode = 0000;
727            edev->attrs_muex[index] = &edev->d_attrs_muex[index]
728                            .attr;
729        }
730        edev->attr_g_muex.name = muex_name;
731        edev->attr_g_muex.attrs = edev->attrs_muex;
732
733    }
734
735    if (edev->max_supported) {
736        edev->extcon_dev_type.groups =
737            kzalloc(sizeof(struct attribute_group *) *
738                (edev->max_supported + 2), GFP_KERNEL);
739        if (!edev->extcon_dev_type.groups) {
740            ret = -ENOMEM;
741            goto err_alloc_groups;
742        }
743
744        edev->extcon_dev_type.name = dev_name(edev->dev);
745        edev->extcon_dev_type.release = dummy_sysfs_dev_release;
746
747        for (index = 0; index < edev->max_supported; index++)
748            edev->extcon_dev_type.groups[index] =
749                &edev->cables[index].attr_g;
750        if (edev->mutually_exclusive)
751            edev->extcon_dev_type.groups[index] =
752                &edev->attr_g_muex;
753
754        edev->dev->type = &edev->extcon_dev_type;
755    }
756
757    ret = device_register(edev->dev);
758    if (ret) {
759        put_device(edev->dev);
760        goto err_dev;
761    }
762#if defined(CONFIG_ANDROID)
763    if (switch_class)
764        ret = class_compat_create_link(switch_class, edev->dev,
765                           NULL);
766#endif /* CONFIG_ANDROID */
767
768    spin_lock_init(&edev->lock);
769
770    RAW_INIT_NOTIFIER_HEAD(&edev->nh);
771
772    dev_set_drvdata(edev->dev, edev);
773    edev->state = 0;
774
775    mutex_lock(&extcon_dev_list_lock);
776    list_add(&edev->entry, &extcon_dev_list);
777    mutex_unlock(&extcon_dev_list_lock);
778
779    return 0;
780
781err_dev:
782    if (edev->max_supported)
783        kfree(edev->extcon_dev_type.groups);
784err_alloc_groups:
785    if (edev->max_supported && edev->mutually_exclusive) {
786        for (index = 0; edev->mutually_exclusive[index]; index++)
787            kfree(edev->d_attrs_muex[index].attr.name);
788        kfree(edev->d_attrs_muex);
789        kfree(edev->attrs_muex);
790    }
791err_muex:
792    for (index = 0; index < edev->max_supported; index++)
793        kfree(edev->cables[index].attr_g.name);
794err_alloc_cables:
795    if (edev->max_supported)
796        kfree(edev->cables);
797err_sysfs_alloc:
798    kfree(edev->dev);
799    return ret;
800}
801EXPORT_SYMBOL_GPL(extcon_dev_register);
802
803/**
804 * extcon_dev_unregister() - Unregister the extcon device.
805 * @edev: the extcon device instance to be unregitered.
806 *
807 * Note that this does not call kfree(edev) because edev was not allocated
808 * by this class.
809 */
810void extcon_dev_unregister(struct extcon_dev *edev)
811{
812    extcon_cleanup(edev, false);
813}
814EXPORT_SYMBOL_GPL(extcon_dev_unregister);
815
816static int __init extcon_class_init(void)
817{
818    return create_extcon_class();
819}
820module_init(extcon_class_init);
821
822static void __exit extcon_class_exit(void)
823{
824    class_destroy(extcon_class);
825}
826module_exit(extcon_class_exit);
827
828MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
829MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
830MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
831MODULE_DESCRIPTION("External connector (extcon) class driver");
832MODULE_LICENSE("GPL");
833

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