2 * drivers/extcon/extcon_class.c
4 * External connector (extcon) class driver
6 * Copyright (C) 2012 Samsung Electronics
7 * Author: Donggeun Kim <dg77.kim@samsung.com>
8 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
10 * based on android/drivers/switch/switch_class.c
11 * Copyright (C) 2008 Google, Inc.
12 * Author: Mike Lockwood <lockwood@android.com>
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.
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.
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/extcon.h>
33 #include <linux/slab.h>
34 #include <linux/sysfs.h>
38 * extcon_cable_name suggests the standard cable names for commonly used
41 * However, please do not use extcon_cable_name directly for extcon_dev
42 * struct's supported_cable pointer unless your device really supports
43 * every single port-type of the following cable names. Please choose cable
44 * names that are actually used in your extcon device.
46 const char extcon_cable_name[][CABLE_NAME_MAX + 1] = {
48 [EXTCON_USB_HOST] = "USB-Host",
50 [EXTCON_FAST_CHARGER] = "Fast-charger",
51 [EXTCON_SLOW_CHARGER] = "Slow-charger",
52 [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream",
53 [EXTCON_HDMI] = "HDMI",
57 [EXTCON_DOCK] = "Dock",
58 [EXTCON_LINE_IN] = "Line-in",
59 [EXTCON_LINE_OUT] = "Line-out",
60 [EXTCON_MIC_IN] = "Microphone",
61 [EXTCON_HEADPHONE_OUT] = "Headphone",
62 [EXTCON_SPDIF_IN] = "SPDIF-in",
63 [EXTCON_SPDIF_OUT] = "SPDIF-out",
64 [EXTCON_VIDEO_IN] = "Video-in",
65 [EXTCON_VIDEO_OUT] = "Video-out",
66 [EXTCON_MECHANICAL] = "Mechanical",
69 static struct class *extcon_class;
70 #if defined(CONFIG_ANDROID)
71 static struct class_compat *switch_class;
72 #endif /* CONFIG_ANDROID */
74 static LIST_HEAD(extcon_dev_list);
75 static DEFINE_MUTEX(extcon_dev_list_lock);
78 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
80 * @edev: the extcon device
81 * @new_state: new cable attach status for @edev
83 * Returns 0 if nothing violates. Returns the index + 1 for the first
86 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
90 if (!edev->mutually_exclusive)
93 for (i = 0; edev->mutually_exclusive[i]; i++) {
95 u32 correspondants = new_state & edev->mutually_exclusive[i];
97 /* calculate the total number of bits set */
98 weight = hweight32(correspondants);
106 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
110 struct extcon_dev *edev = dev_get_drvdata(dev);
112 if (edev->print_state) {
113 int ret = edev->print_state(edev, buf);
117 /* Use default if failed */
120 if (edev->max_supported == 0)
121 return sprintf(buf, "%u\n", edev->state);
123 for (i = 0; i < SUPPORTED_CABLE_MAX; i++) {
124 if (!edev->supported_cable[i])
126 count += sprintf(buf + count, "%s=%d\n",
127 edev->supported_cable[i],
128 !!(edev->state & (1 << i)));
134 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
139 struct extcon_dev *edev = dev_get_drvdata(dev);
141 ret = sscanf(buf, "0x%x", &state);
145 ret = extcon_set_state(edev, state);
152 static DEVICE_ATTR_RW(state);
154 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
157 struct extcon_dev *edev = dev_get_drvdata(dev);
159 /* Optional callback given by the user */
160 if (edev->print_name) {
161 int ret = edev->print_name(edev, buf);
166 return sprintf(buf, "%s\n", dev_name(&edev->dev));
168 static DEVICE_ATTR_RO(name);
170 static ssize_t cable_name_show(struct device *dev,
171 struct device_attribute *attr, char *buf)
173 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
176 return sprintf(buf, "%s\n",
177 cable->edev->supported_cable[cable->cable_index]);
180 static ssize_t cable_state_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
183 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
186 return sprintf(buf, "%d\n",
187 extcon_get_cable_state_(cable->edev,
188 cable->cable_index));
192 * extcon_update_state() - Update the cable attach states of the extcon device
193 * only for the masked bits.
194 * @edev: the extcon device
195 * @mask: the bit mask to designate updated bits.
196 * @state: new cable attach status for @edev
198 * Changing the state sends uevent with environment variable containing
199 * the name of extcon device (envp[0]) and the state output (envp[1]).
200 * Tizen uses this format for extcon device to get events from ports.
201 * Android uses this format as well.
203 * Note that the notifier provides which bits are changed in the state
204 * variable with the val parameter (second) to the callback.
206 int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
216 spin_lock_irqsave(&edev->lock, flags);
218 if (edev->state != ((edev->state & ~mask) | (state & mask))) {
219 u32 old_state = edev->state;
221 if (check_mutually_exclusive(edev, (edev->state & ~mask) |
223 spin_unlock_irqrestore(&edev->lock, flags);
227 edev->state &= ~mask;
228 edev->state |= state & mask;
230 raw_notifier_call_chain(&edev->nh, old_state, edev);
231 /* This could be in interrupt handler */
232 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
234 length = name_show(&edev->dev, NULL, prop_buf);
236 if (prop_buf[length - 1] == '\n')
237 prop_buf[length - 1] = 0;
238 snprintf(name_buf, sizeof(name_buf),
239 "NAME=%s", prop_buf);
240 envp[env_offset++] = name_buf;
242 length = state_show(&edev->dev, NULL, prop_buf);
244 if (prop_buf[length - 1] == '\n')
245 prop_buf[length - 1] = 0;
246 snprintf(state_buf, sizeof(state_buf),
247 "STATE=%s", prop_buf);
248 envp[env_offset++] = state_buf;
250 envp[env_offset] = NULL;
251 /* Unlock early before uevent */
252 spin_unlock_irqrestore(&edev->lock, flags);
254 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
255 free_page((unsigned long)prop_buf);
257 /* Unlock early before uevent */
258 spin_unlock_irqrestore(&edev->lock, flags);
260 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
261 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
265 spin_unlock_irqrestore(&edev->lock, flags);
270 EXPORT_SYMBOL_GPL(extcon_update_state);
273 * extcon_set_state() - Set the cable attach states of the extcon device.
274 * @edev: the extcon device
275 * @state: new cable attach status for @edev
277 * Note that notifier provides which bits are changed in the state
278 * variable with the val parameter (second) to the callback.
280 int extcon_set_state(struct extcon_dev *edev, u32 state)
282 return extcon_update_state(edev, 0xffffffff, state);
284 EXPORT_SYMBOL_GPL(extcon_set_state);
287 * extcon_find_cable_index() - Get the cable index based on the cable name.
288 * @edev: the extcon device that has the cable.
289 * @cable_name: cable name to be searched.
291 * Note that accessing a cable state based on cable_index is faster than
292 * cable_name because using cable_name induces a loop with strncmp().
293 * Thus, when get/set_cable_state is repeatedly used, using cable_index
296 int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
300 if (edev->supported_cable) {
301 for (i = 0; edev->supported_cable[i]; i++) {
302 if (!strncmp(edev->supported_cable[i],
303 cable_name, CABLE_NAME_MAX))
310 EXPORT_SYMBOL_GPL(extcon_find_cable_index);
313 * extcon_get_cable_state_() - Get the status of a specific cable.
314 * @edev: the extcon device that has the cable.
315 * @index: cable index that can be retrieved by extcon_find_cable_index().
317 int extcon_get_cable_state_(struct extcon_dev *edev, int index)
319 if (index < 0 || (edev->max_supported && edev->max_supported <= index))
322 return !!(edev->state & (1 << index));
324 EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
327 * extcon_get_cable_state() - Get the status of a specific cable.
328 * @edev: the extcon device that has the cable.
329 * @cable_name: cable name.
331 * Note that this is slower than extcon_get_cable_state_.
333 int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
335 return extcon_get_cable_state_(edev, extcon_find_cable_index
338 EXPORT_SYMBOL_GPL(extcon_get_cable_state);
341 * extcon_set_cable_state_() - Set the status of a specific cable.
342 * @edev: the extcon device that has the cable.
343 * @index: cable index that can be retrieved by
344 * extcon_find_cable_index().
345 * @cable_state: the new cable status. The default semantics is
346 * true: attached / false: detached.
348 int extcon_set_cable_state_(struct extcon_dev *edev,
349 int index, bool cable_state)
353 if (index < 0 || (edev->max_supported && edev->max_supported <= index))
356 state = cable_state ? (1 << index) : 0;
357 return extcon_update_state(edev, 1 << index, state);
359 EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
362 * extcon_set_cable_state() - Set the status of a specific cable.
363 * @edev: the extcon device that has the cable.
364 * @cable_name: cable name.
365 * @cable_state: the new cable status. The default semantics is
366 * true: attached / false: detached.
368 * Note that this is slower than extcon_set_cable_state_.
370 int extcon_set_cable_state(struct extcon_dev *edev,
371 const char *cable_name, bool cable_state)
373 return extcon_set_cable_state_(edev, extcon_find_cable_index
374 (edev, cable_name), cable_state);
376 EXPORT_SYMBOL_GPL(extcon_set_cable_state);
379 * extcon_get_extcon_dev() - Get the extcon device instance from the name
380 * @extcon_name: The extcon name provided with extcon_dev_register()
382 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
384 struct extcon_dev *sd;
386 mutex_lock(&extcon_dev_list_lock);
387 list_for_each_entry(sd, &extcon_dev_list, entry) {
388 if (!strcmp(sd->name, extcon_name))
393 mutex_unlock(&extcon_dev_list_lock);
396 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
398 static int _call_per_cable(struct notifier_block *nb, unsigned long val,
401 struct extcon_specific_cable_nb *obj = container_of(nb,
402 struct extcon_specific_cable_nb, internal_nb);
403 struct extcon_dev *edev = ptr;
405 if ((val & (1 << obj->cable_index)) !=
406 (edev->state & (1 << obj->cable_index))) {
407 bool cable_state = true;
409 obj->previous_value = val;
411 if (val & (1 << obj->cable_index))
414 return obj->user_nb->notifier_call(obj->user_nb,
422 * extcon_register_interest() - Register a notifier for a state change of a
423 * specific cable, not an entier set of cables of a
425 * @obj: an empty extcon_specific_cable_nb object to be returned.
426 * @extcon_name: the name of extcon device.
427 * if NULL, extcon_register_interest will register
428 * every cable with the target cable_name given.
429 * @cable_name: the target cable name.
430 * @nb: the notifier block to get notified.
432 * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
433 * the struct for you.
435 * extcon_register_interest is a helper function for those who want to get
436 * notification for a single specific cable's status change. If a user wants
437 * to get notification for any changes of all cables of a extcon device,
438 * he/she should use the general extcon_register_notifier().
440 * Note that the second parameter given to the callback of nb (val) is
441 * "old_state", not the current state. The current state can be retrieved
442 * by looking at the third pameter (edev pointer)'s state value.
444 int extcon_register_interest(struct extcon_specific_cable_nb *obj,
445 const char *extcon_name, const char *cable_name,
446 struct notifier_block *nb)
448 if (!obj || !cable_name || !nb)
452 obj->edev = extcon_get_extcon_dev(extcon_name);
456 obj->cable_index = extcon_find_cable_index(obj->edev,
458 if (obj->cable_index < 0)
459 return obj->cable_index;
463 obj->internal_nb.notifier_call = _call_per_cable;
465 return raw_notifier_chain_register(&obj->edev->nh,
468 struct class_dev_iter iter;
469 struct extcon_dev *extd;
474 class_dev_iter_init(&iter, extcon_class, NULL, NULL);
475 while ((dev = class_dev_iter_next(&iter))) {
476 extd = dev_get_drvdata(dev);
478 if (extcon_find_cable_index(extd, cable_name) < 0)
481 class_dev_iter_exit(&iter);
482 return extcon_register_interest(obj, extd->name,
489 EXPORT_SYMBOL_GPL(extcon_register_interest);
492 * extcon_unregister_interest() - Unregister the notifier registered by
493 * extcon_register_interest().
494 * @obj: the extcon_specific_cable_nb object returned by
495 * extcon_register_interest().
497 int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
502 return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
504 EXPORT_SYMBOL_GPL(extcon_unregister_interest);
507 * extcon_register_notifier() - Register a notifiee to get notified by
508 * any attach status changes from the extcon.
509 * @edev: the extcon device.
510 * @nb: a notifier block to be registered.
512 * Note that the second parameter given to the callback of nb (val) is
513 * "old_state", not the current state. The current state can be retrieved
514 * by looking at the third pameter (edev pointer)'s state value.
516 int extcon_register_notifier(struct extcon_dev *edev,
517 struct notifier_block *nb)
519 return raw_notifier_chain_register(&edev->nh, nb);
521 EXPORT_SYMBOL_GPL(extcon_register_notifier);
524 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
525 * @edev: the extcon device.
526 * @nb: a registered notifier block to be unregistered.
528 int extcon_unregister_notifier(struct extcon_dev *edev,
529 struct notifier_block *nb)
531 return raw_notifier_chain_unregister(&edev->nh, nb);
533 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
535 static struct attribute *extcon_attrs[] = {
536 &dev_attr_state.attr,
540 ATTRIBUTE_GROUPS(extcon);
542 static int create_extcon_class(void)
545 extcon_class = class_create(THIS_MODULE, "extcon");
546 if (IS_ERR(extcon_class))
547 return PTR_ERR(extcon_class);
548 extcon_class->dev_groups = extcon_groups;
550 #if defined(CONFIG_ANDROID)
551 switch_class = class_compat_register("switch");
552 if (WARN(!switch_class, "cannot allocate"))
554 #endif /* CONFIG_ANDROID */
560 static void extcon_dev_release(struct device *dev)
564 static const char *muex_name = "mutually_exclusive";
565 static void dummy_sysfs_dev_release(struct device *dev)
570 * extcon_dev_allocate() - Allocate the memory of extcon device.
571 * @supported_cable: Array of supported cable names ending with NULL.
572 * If supported_cable is NULL, cable name related APIs
575 * This function allocates the memory for extcon device without allocating
576 * memory in each extcon provider driver and initialize default setting for
579 * Return the pointer of extcon device if success or ERR_PTR(err) if fail
581 struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
583 struct extcon_dev *edev;
585 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
587 return ERR_PTR(-ENOMEM);
589 edev->max_supported = 0;
590 edev->supported_cable = supported_cable;
596 * extcon_dev_free() - Free the memory of extcon device.
597 * @edev: the extcon device to free
599 void extcon_dev_free(struct extcon_dev *edev)
603 EXPORT_SYMBOL_GPL(extcon_dev_free);
605 static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
607 struct extcon_dev **r = res;
609 if (WARN_ON(!r || !*r))
615 static void devm_extcon_dev_release(struct device *dev, void *res)
617 extcon_dev_free(*(struct extcon_dev **)res);
621 * devm_extcon_dev_allocate - Allocate managed extcon device
622 * @dev: device owning the extcon device being created
623 * @supported_cable: Array of supported cable names ending with NULL.
624 * If supported_cable is NULL, cable name related APIs
627 * This function manages automatically the memory of extcon device using device
628 * resource management and simplify the control of freeing the memory of extcon
631 * Returns the pointer memory of allocated extcon_dev if success
632 * or ERR_PTR(err) if fail
634 struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
635 const char **supported_cable)
637 struct extcon_dev **ptr, *edev;
639 ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
641 return ERR_PTR(-ENOMEM);
643 edev = extcon_dev_allocate(supported_cable);
649 edev->dev.parent = dev;
652 devres_add(dev, ptr);
656 EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
658 void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
660 WARN_ON(devres_release(dev, devm_extcon_dev_release,
661 devm_extcon_dev_match, edev));
663 EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
666 * extcon_dev_register() - Register a new extcon device
667 * @edev : the new extcon device (should be allocated before calling)
669 * Among the members of edev struct, please set the "user initializing data"
670 * in any case and set the "optional callbacks" if required. However, please
671 * do not set the values of "internal data", which are initialized by
674 int extcon_dev_register(struct extcon_dev *edev)
679 ret = create_extcon_class();
684 if (edev->supported_cable) {
685 /* Get size of array */
686 for (index = 0; edev->supported_cable[index]; index++)
688 edev->max_supported = index;
690 edev->max_supported = 0;
693 if (index > SUPPORTED_CABLE_MAX) {
694 dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n");
698 edev->dev.class = extcon_class;
699 edev->dev.release = extcon_dev_release;
701 edev->name = edev->name ? edev->name : dev_name(edev->dev.parent);
702 if (IS_ERR_OR_NULL(edev->name)) {
704 "extcon device name is null\n");
707 dev_set_name(&edev->dev, "%s", edev->name);
709 if (edev->max_supported) {
712 struct extcon_cable *cable;
714 edev->cables = kzalloc(sizeof(struct extcon_cable) *
715 edev->max_supported, GFP_KERNEL);
718 goto err_sysfs_alloc;
720 for (index = 0; index < edev->max_supported; index++) {
721 cable = &edev->cables[index];
723 snprintf(buf, 10, "cable.%d", index);
724 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
727 for (index--; index >= 0; index--) {
728 cable = &edev->cables[index];
729 kfree(cable->attr_g.name);
733 goto err_alloc_cables;
738 cable->cable_index = index;
739 cable->attrs[0] = &cable->attr_name.attr;
740 cable->attrs[1] = &cable->attr_state.attr;
741 cable->attrs[2] = NULL;
742 cable->attr_g.name = str;
743 cable->attr_g.attrs = cable->attrs;
745 sysfs_attr_init(&cable->attr_name.attr);
746 cable->attr_name.attr.name = "name";
747 cable->attr_name.attr.mode = 0444;
748 cable->attr_name.show = cable_name_show;
750 sysfs_attr_init(&cable->attr_state.attr);
751 cable->attr_state.attr.name = "state";
752 cable->attr_state.attr.mode = 0444;
753 cable->attr_state.show = cable_state_show;
757 if (edev->max_supported && edev->mutually_exclusive) {
761 /* Count the size of mutually_exclusive array */
762 for (index = 0; edev->mutually_exclusive[index]; index++)
765 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
766 (index + 1), GFP_KERNEL);
767 if (!edev->attrs_muex) {
772 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
774 if (!edev->d_attrs_muex) {
776 kfree(edev->attrs_muex);
780 for (index = 0; edev->mutually_exclusive[index]; index++) {
781 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
782 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
785 for (index--; index >= 0; index--) {
786 kfree(edev->d_attrs_muex[index].attr.
789 kfree(edev->d_attrs_muex);
790 kfree(edev->attrs_muex);
795 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
796 edev->d_attrs_muex[index].attr.name = name;
797 edev->d_attrs_muex[index].attr.mode = 0000;
798 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
801 edev->attr_g_muex.name = muex_name;
802 edev->attr_g_muex.attrs = edev->attrs_muex;
806 if (edev->max_supported) {
807 edev->extcon_dev_type.groups =
808 kzalloc(sizeof(struct attribute_group *) *
809 (edev->max_supported + 2), GFP_KERNEL);
810 if (!edev->extcon_dev_type.groups) {
812 goto err_alloc_groups;
815 edev->extcon_dev_type.name = dev_name(&edev->dev);
816 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
818 for (index = 0; index < edev->max_supported; index++)
819 edev->extcon_dev_type.groups[index] =
820 &edev->cables[index].attr_g;
821 if (edev->mutually_exclusive)
822 edev->extcon_dev_type.groups[index] =
825 edev->dev.type = &edev->extcon_dev_type;
828 ret = device_register(&edev->dev);
830 put_device(&edev->dev);
833 #if defined(CONFIG_ANDROID)
835 ret = class_compat_create_link(switch_class, &edev->dev, NULL);
836 #endif /* CONFIG_ANDROID */
838 spin_lock_init(&edev->lock);
840 RAW_INIT_NOTIFIER_HEAD(&edev->nh);
842 dev_set_drvdata(&edev->dev, edev);
845 mutex_lock(&extcon_dev_list_lock);
846 list_add(&edev->entry, &extcon_dev_list);
847 mutex_unlock(&extcon_dev_list_lock);
852 if (edev->max_supported)
853 kfree(edev->extcon_dev_type.groups);
855 if (edev->max_supported && edev->mutually_exclusive) {
856 for (index = 0; edev->mutually_exclusive[index]; index++)
857 kfree(edev->d_attrs_muex[index].attr.name);
858 kfree(edev->d_attrs_muex);
859 kfree(edev->attrs_muex);
862 for (index = 0; index < edev->max_supported; index++)
863 kfree(edev->cables[index].attr_g.name);
865 if (edev->max_supported)
870 EXPORT_SYMBOL_GPL(extcon_dev_register);
873 * extcon_dev_unregister() - Unregister the extcon device.
874 * @edev: the extcon device instance to be unregistered.
876 * Note that this does not call kfree(edev) because edev was not allocated
879 void extcon_dev_unregister(struct extcon_dev *edev)
883 mutex_lock(&extcon_dev_list_lock);
884 list_del(&edev->entry);
885 mutex_unlock(&extcon_dev_list_lock);
887 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
888 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
889 dev_name(&edev->dev));
893 device_unregister(&edev->dev);
895 if (edev->mutually_exclusive && edev->max_supported) {
896 for (index = 0; edev->mutually_exclusive[index];
898 kfree(edev->d_attrs_muex[index].attr.name);
899 kfree(edev->d_attrs_muex);
900 kfree(edev->attrs_muex);
903 for (index = 0; index < edev->max_supported; index++)
904 kfree(edev->cables[index].attr_g.name);
906 if (edev->max_supported) {
907 kfree(edev->extcon_dev_type.groups);
911 #if defined(CONFIG_ANDROID)
913 class_compat_remove_link(switch_class, &edev->dev, NULL);
915 put_device(&edev->dev);
917 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
919 static void devm_extcon_dev_unreg(struct device *dev, void *res)
921 extcon_dev_unregister(*(struct extcon_dev **)res);
925 * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
926 * @dev: device to allocate extcon device
927 * @edev: the new extcon device to register
929 * Managed extcon_dev_register() function. If extcon device is attached with
930 * this function, that extcon device is automatically unregistered on driver
931 * detach. Internally this function calls extcon_dev_register() function.
932 * To get more information, refer that function.
934 * If extcon device is registered with this function and the device needs to be
935 * unregistered separately, devm_extcon_dev_unregister() should be used.
937 * Returns 0 if success or negaive error number if failure.
939 int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
941 struct extcon_dev **ptr;
944 ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
948 ret = extcon_dev_register(edev);
955 devres_add(dev, ptr);
959 EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
962 * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
963 * @dev: device the extcon belongs to
964 * @edev: the extcon device to unregister
966 * Unregister extcon device that is registered with devm_extcon_dev_register()
969 void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
971 WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
972 devm_extcon_dev_match, edev));
974 EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
978 * extcon_get_edev_by_phandle - Get the extcon device from devicetree
979 * @dev - instance to the given device
980 * @index - index into list of extcon_dev
982 * return the instance of extcon device
984 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
986 struct device_node *node;
987 struct extcon_dev *edev;
990 dev_err(dev, "device does not have a device node entry\n");
991 return ERR_PTR(-EINVAL);
994 node = of_parse_phandle(dev->of_node, "extcon", index);
996 dev_err(dev, "failed to get phandle in %s node\n",
997 dev->of_node->full_name);
998 return ERR_PTR(-ENODEV);
1001 mutex_lock(&extcon_dev_list_lock);
1002 list_for_each_entry(edev, &extcon_dev_list, entry) {
1003 if (edev->dev.parent && edev->dev.parent->of_node == node) {
1004 mutex_unlock(&extcon_dev_list_lock);
1008 mutex_unlock(&extcon_dev_list_lock);
1010 return ERR_PTR(-EPROBE_DEFER);
1013 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1015 return ERR_PTR(-ENOSYS);
1017 #endif /* CONFIG_OF */
1018 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1020 static int __init extcon_class_init(void)
1022 return create_extcon_class();
1024 module_init(extcon_class_init);
1026 static void __exit extcon_class_exit(void)
1028 #if defined(CONFIG_ANDROID)
1029 class_compat_unregister(switch_class);
1031 class_destroy(extcon_class);
1033 module_exit(extcon_class_exit);
1035 MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
1036 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
1037 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1038 MODULE_DESCRIPTION("External connector (extcon) class driver");
1039 MODULE_LICENSE("GPL");