2 * drivers/extcon/extcon.c - External Connector (extcon) framework.
4 * External connector (extcon) class driver
6 * Copyright (C) 2015 Samsung Electronics
7 * Author: Chanwoo Choi <cw00.choi@samsung.com>
9 * Copyright (C) 2012 Samsung Electronics
10 * Author: Donggeun Kim <dg77.kim@samsung.com>
11 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
13 * based on android/drivers/switch/switch_class.c
14 * Copyright (C) 2008 Google, Inc.
15 * Author: Mike Lockwood <lockwood@android.com>
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.
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.
27 #include <linux/module.h>
28 #include <linux/types.h>
29 #include <linux/init.h>
30 #include <linux/device.h>
32 #include <linux/err.h>
33 #include <linux/extcon.h>
35 #include <linux/slab.h>
36 #include <linux/sysfs.h>
38 #define SUPPORTED_CABLE_MAX 32
39 #define CABLE_NAME_MAX 30
41 static const char *extcon_name[] = {
42 [EXTCON_NONE] = "NONE",
44 /* USB external connector */
46 [EXTCON_USB_HOST] = "USB-HOST",
48 /* Charger external connector */
50 [EXTCON_FAST_CHARGER] = "FAST-CHARGER",
51 [EXTCON_SLOW_CHARGER] = "SLOW-CHARGER",
52 [EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM",
54 /* Audio/Video external connector */
55 [EXTCON_LINE_IN] = "LINE-IN",
56 [EXTCON_LINE_OUT] = "LINE-OUT",
57 [EXTCON_MICROPHONE] = "MICROPHONE",
58 [EXTCON_HEADPHONE] = "HEADPHONE",
60 [EXTCON_HDMI] = "HDMI",
64 [EXTCON_SPDIF_IN] = "SPDIF-IN",
65 [EXTCON_SPDIF_OUT] = "SPDIF-OUT",
66 [EXTCON_VIDEO_IN] = "VIDEO-IN",
67 [EXTCON_VIDEO_OUT] = "VIDEO-OUT",
69 /* Etc external connector */
70 [EXTCON_DOCK] = "DOCK",
72 [EXTCON_MECHANICAL] = "MECHANICAL",
77 static struct class *extcon_class;
78 #if defined(CONFIG_ANDROID)
79 static struct class_compat *switch_class;
80 #endif /* CONFIG_ANDROID */
82 static LIST_HEAD(extcon_dev_list);
83 static DEFINE_MUTEX(extcon_dev_list_lock);
86 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
88 * @edev: the extcon device
89 * @new_state: new cable attach status for @edev
91 * Returns 0 if nothing violates. Returns the index + 1 for the first
94 static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
98 if (!edev->mutually_exclusive)
101 for (i = 0; edev->mutually_exclusive[i]; i++) {
103 u32 correspondants = new_state & edev->mutually_exclusive[i];
105 /* calculate the total number of bits set */
106 weight = hweight32(correspondants);
114 static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
118 /* Find the the index of extcon cable in edev->supported_cable */
119 for (i = 0; i < edev->max_supported; i++) {
120 if (edev->supported_cable[i] == id)
127 static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
132 /* Find the id of extcon cable */
133 while (extcon_name[i]) {
134 if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
144 static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
148 if (edev->max_supported == 0)
151 /* Find the the number of extcon cable */
152 id = find_cable_id_by_name(edev, name);
156 return find_cable_index_by_id(edev, id);
159 static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached)
161 if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) {
162 *attached = new ? true : false;
169 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
173 struct extcon_dev *edev = dev_get_drvdata(dev);
175 if (edev->max_supported == 0)
176 return sprintf(buf, "%u\n", edev->state);
178 for (i = 0; i < edev->max_supported; i++) {
179 count += sprintf(buf + count, "%s=%d\n",
180 extcon_name[edev->supported_cable[i]],
181 !!(edev->state & (1 << i)));
187 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
188 const char *buf, size_t count)
192 struct extcon_dev *edev = dev_get_drvdata(dev);
194 ret = sscanf(buf, "0x%x", &state);
198 ret = extcon_set_state(edev, state);
205 static DEVICE_ATTR_RW(state);
207 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
210 struct extcon_dev *edev = dev_get_drvdata(dev);
212 return sprintf(buf, "%s\n", edev->name);
214 static DEVICE_ATTR_RO(name);
216 static ssize_t cable_name_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
219 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
221 int i = cable->cable_index;
223 return sprintf(buf, "%s\n",
224 extcon_name[cable->edev->supported_cable[i]]);
227 static ssize_t cable_state_show(struct device *dev,
228 struct device_attribute *attr, char *buf)
230 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
233 int i = cable->cable_index;
235 return sprintf(buf, "%d\n",
236 extcon_get_cable_state_(cable->edev,
237 cable->edev->supported_cable[i]));
241 * extcon_update_state() - Update the cable attach states of the extcon device
242 * only for the masked bits.
243 * @edev: the extcon device
244 * @mask: the bit mask to designate updated bits.
245 * @state: new cable attach status for @edev
247 * Changing the state sends uevent with environment variable containing
248 * the name of extcon device (envp[0]) and the state output (envp[1]).
249 * Tizen uses this format for extcon device to get events from ports.
250 * Android uses this format as well.
252 * Note that the notifier provides which bits are changed in the state
253 * variable with the val parameter (second) to the callback.
255 int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
270 spin_lock_irqsave(&edev->lock, flags);
272 if (edev->state != ((edev->state & ~mask) | (state & mask))) {
275 if (check_mutually_exclusive(edev, (edev->state & ~mask) |
277 spin_unlock_irqrestore(&edev->lock, flags);
281 old_state = edev->state;
282 edev->state &= ~mask;
283 edev->state |= state & mask;
285 for (index = 0; index < edev->max_supported; index++) {
286 if (is_extcon_changed(old_state, edev->state, index,
288 raw_notifier_call_chain(&edev->nh[index],
292 /* This could be in interrupt handler */
293 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
295 length = name_show(&edev->dev, NULL, prop_buf);
297 if (prop_buf[length - 1] == '\n')
298 prop_buf[length - 1] = 0;
299 snprintf(name_buf, sizeof(name_buf),
300 "NAME=%s", prop_buf);
301 envp[env_offset++] = name_buf;
303 length = state_show(&edev->dev, NULL, prop_buf);
305 if (prop_buf[length - 1] == '\n')
306 prop_buf[length - 1] = 0;
307 snprintf(state_buf, sizeof(state_buf),
308 "STATE=%s", prop_buf);
309 envp[env_offset++] = state_buf;
311 envp[env_offset] = NULL;
312 /* Unlock early before uevent */
313 spin_unlock_irqrestore(&edev->lock, flags);
315 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
316 free_page((unsigned long)prop_buf);
318 /* Unlock early before uevent */
319 spin_unlock_irqrestore(&edev->lock, flags);
321 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
322 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
326 spin_unlock_irqrestore(&edev->lock, flags);
331 EXPORT_SYMBOL_GPL(extcon_update_state);
334 * extcon_set_state() - Set the cable attach states of the extcon device.
335 * @edev: the extcon device
336 * @state: new cable attach status for @edev
338 * Note that notifier provides which bits are changed in the state
339 * variable with the val parameter (second) to the callback.
341 int extcon_set_state(struct extcon_dev *edev, u32 state)
346 return extcon_update_state(edev, 0xffffffff, state);
348 EXPORT_SYMBOL_GPL(extcon_set_state);
351 * extcon_get_cable_state_() - Get the status of a specific cable.
352 * @edev: the extcon device that has the cable.
353 * @id: the unique id of each external connector in extcon enumeration.
355 int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
362 index = find_cable_index_by_id(edev, id);
366 if (edev->max_supported && edev->max_supported <= index)
369 return !!(edev->state & (1 << index));
371 EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
374 * extcon_get_cable_state() - Get the status of a specific cable.
375 * @edev: the extcon device that has the cable.
376 * @cable_name: cable name.
378 * Note that this is slower than extcon_get_cable_state_.
380 int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
384 id = find_cable_id_by_name(edev, cable_name);
388 return extcon_get_cable_state_(edev, id);
390 EXPORT_SYMBOL_GPL(extcon_get_cable_state);
393 * extcon_set_cable_state_() - Set the status of a specific cable.
394 * @edev: the extcon device that has the cable.
395 * @id: the unique id of each external connector
396 * in extcon enumeration.
397 * @state: the new cable status. The default semantics is
398 * true: attached / false: detached.
400 int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
409 index = find_cable_index_by_id(edev, id);
413 if (edev->max_supported && edev->max_supported <= index)
416 state = cable_state ? (1 << index) : 0;
417 return extcon_update_state(edev, 1 << index, state);
419 EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
422 * extcon_set_cable_state() - Set the status of a specific cable.
423 * @edev: the extcon device that has the cable.
424 * @cable_name: cable name.
425 * @cable_state: the new cable status. The default semantics is
426 * true: attached / false: detached.
428 * Note that this is slower than extcon_set_cable_state_.
430 int extcon_set_cable_state(struct extcon_dev *edev,
431 const char *cable_name, bool cable_state)
435 id = find_cable_id_by_name(edev, cable_name);
439 return extcon_set_cable_state_(edev, id, cable_state);
441 EXPORT_SYMBOL_GPL(extcon_set_cable_state);
444 * extcon_get_extcon_dev() - Get the extcon device instance from the name
445 * @extcon_name: The extcon name provided with extcon_dev_register()
447 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
449 struct extcon_dev *sd;
452 return ERR_PTR(-EINVAL);
454 mutex_lock(&extcon_dev_list_lock);
455 list_for_each_entry(sd, &extcon_dev_list, entry) {
456 if (!strcmp(sd->name, extcon_name))
461 mutex_unlock(&extcon_dev_list_lock);
464 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
467 * extcon_register_interest() - Register a notifier for a state change of a
468 * specific cable, not an entier set of cables of a
470 * @obj: an empty extcon_specific_cable_nb object to be returned.
471 * @extcon_name: the name of extcon device.
472 * if NULL, extcon_register_interest will register
473 * every cable with the target cable_name given.
474 * @cable_name: the target cable name.
475 * @nb: the notifier block to get notified.
477 * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
478 * the struct for you.
480 * extcon_register_interest is a helper function for those who want to get
481 * notification for a single specific cable's status change. If a user wants
482 * to get notification for any changes of all cables of a extcon device,
483 * he/she should use the general extcon_register_notifier().
485 * Note that the second parameter given to the callback of nb (val) is
486 * "old_state", not the current state. The current state can be retrieved
487 * by looking at the third pameter (edev pointer)'s state value.
489 int extcon_register_interest(struct extcon_specific_cable_nb *obj,
490 const char *extcon_name, const char *cable_name,
491 struct notifier_block *nb)
496 if (!obj || !cable_name || !nb)
500 obj->edev = extcon_get_extcon_dev(extcon_name);
504 obj->cable_index = find_cable_index_by_name(obj->edev,
506 if (obj->cable_index < 0)
507 return obj->cable_index;
511 spin_lock_irqsave(&obj->edev->lock, flags);
512 ret = raw_notifier_chain_register(
513 &obj->edev->nh[obj->cable_index],
515 spin_unlock_irqrestore(&obj->edev->lock, flags);
517 struct class_dev_iter iter;
518 struct extcon_dev *extd;
523 class_dev_iter_init(&iter, extcon_class, NULL, NULL);
524 while ((dev = class_dev_iter_next(&iter))) {
525 extd = dev_get_drvdata(dev);
527 if (find_cable_index_by_name(extd, cable_name) < 0)
530 class_dev_iter_exit(&iter);
531 return extcon_register_interest(obj, extd->name,
540 EXPORT_SYMBOL_GPL(extcon_register_interest);
543 * extcon_unregister_interest() - Unregister the notifier registered by
544 * extcon_register_interest().
545 * @obj: the extcon_specific_cable_nb object returned by
546 * extcon_register_interest().
548 int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
556 spin_lock_irqsave(&obj->edev->lock, flags);
557 ret = raw_notifier_chain_unregister(
558 &obj->edev->nh[obj->cable_index], obj->user_nb);
559 spin_unlock_irqrestore(&obj->edev->lock, flags);
563 EXPORT_SYMBOL_GPL(extcon_unregister_interest);
566 * extcon_register_notifier() - Register a notifiee to get notified by
567 * any attach status changes from the extcon.
568 * @edev: the extcon device that has the external connecotr.
569 * @id: the unique id of each external connector in extcon enumeration.
570 * @nb: a notifier block to be registered.
572 * Note that the second parameter given to the callback of nb (val) is
573 * "old_state", not the current state. The current state can be retrieved
574 * by looking at the third pameter (edev pointer)'s state value.
576 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
577 struct notifier_block *nb)
585 idx = find_cable_index_by_id(edev, id);
587 spin_lock_irqsave(&edev->lock, flags);
588 ret = raw_notifier_chain_register(&edev->nh[idx], nb);
589 spin_unlock_irqrestore(&edev->lock, flags);
593 EXPORT_SYMBOL_GPL(extcon_register_notifier);
596 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
597 * @edev: the extcon device that has the external connecotr.
598 * @id: the unique id of each external connector in extcon enumeration.
599 * @nb: a notifier block to be registered.
601 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
602 struct notifier_block *nb)
610 idx = find_cable_index_by_id(edev, id);
612 spin_lock_irqsave(&edev->lock, flags);
613 ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
614 spin_unlock_irqrestore(&edev->lock, flags);
618 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
620 static struct attribute *extcon_attrs[] = {
621 &dev_attr_state.attr,
625 ATTRIBUTE_GROUPS(extcon);
627 static int create_extcon_class(void)
630 extcon_class = class_create(THIS_MODULE, "extcon");
631 if (IS_ERR(extcon_class))
632 return PTR_ERR(extcon_class);
633 extcon_class->dev_groups = extcon_groups;
635 #if defined(CONFIG_ANDROID)
636 switch_class = class_compat_register("switch");
637 if (WARN(!switch_class, "cannot allocate"))
639 #endif /* CONFIG_ANDROID */
645 static void extcon_dev_release(struct device *dev)
649 static const char *muex_name = "mutually_exclusive";
650 static void dummy_sysfs_dev_release(struct device *dev)
655 * extcon_dev_allocate() - Allocate the memory of extcon device.
656 * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
657 * If supported_cable is NULL, cable name related APIs
660 * This function allocates the memory for extcon device without allocating
661 * memory in each extcon provider driver and initialize default setting for
664 * Return the pointer of extcon device if success or ERR_PTR(err) if fail
666 struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
668 struct extcon_dev *edev;
670 if (!supported_cable)
671 return ERR_PTR(-EINVAL);
673 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
675 return ERR_PTR(-ENOMEM);
677 edev->max_supported = 0;
678 edev->supported_cable = supported_cable;
684 * extcon_dev_free() - Free the memory of extcon device.
685 * @edev: the extcon device to free
687 void extcon_dev_free(struct extcon_dev *edev)
691 EXPORT_SYMBOL_GPL(extcon_dev_free);
693 static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
695 struct extcon_dev **r = res;
697 if (WARN_ON(!r || !*r))
703 static void devm_extcon_dev_release(struct device *dev, void *res)
705 extcon_dev_free(*(struct extcon_dev **)res);
709 * devm_extcon_dev_allocate - Allocate managed extcon device
710 * @dev: device owning the extcon device being created
711 * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
712 * If supported_cable is NULL, cable name related APIs
715 * This function manages automatically the memory of extcon device using device
716 * resource management and simplify the control of freeing the memory of extcon
719 * Returns the pointer memory of allocated extcon_dev if success
720 * or ERR_PTR(err) if fail
722 struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
723 const unsigned int *supported_cable)
725 struct extcon_dev **ptr, *edev;
727 ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
729 return ERR_PTR(-ENOMEM);
731 edev = extcon_dev_allocate(supported_cable);
737 edev->dev.parent = dev;
740 devres_add(dev, ptr);
744 EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
746 void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
748 WARN_ON(devres_release(dev, devm_extcon_dev_release,
749 devm_extcon_dev_match, edev));
751 EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
754 * extcon_dev_register() - Register a new extcon device
755 * @edev : the new extcon device (should be allocated before calling)
757 * Among the members of edev struct, please set the "user initializing data"
758 * in any case and set the "optional callbacks" if required. However, please
759 * do not set the values of "internal data", which are initialized by
762 int extcon_dev_register(struct extcon_dev *edev)
765 static atomic_t edev_no = ATOMIC_INIT(-1);
768 ret = create_extcon_class();
773 if (!edev || !edev->supported_cable)
776 for (; edev->supported_cable[index] != EXTCON_NONE; index++);
778 edev->max_supported = index;
779 if (index > SUPPORTED_CABLE_MAX) {
781 "exceed the maximum number of supported cables\n");
785 edev->dev.class = extcon_class;
786 edev->dev.release = extcon_dev_release;
788 edev->name = dev_name(edev->dev.parent);
789 if (IS_ERR_OR_NULL(edev->name)) {
791 "extcon device name is null\n");
794 dev_set_name(&edev->dev, "extcon%lu",
795 (unsigned long)atomic_inc_return(&edev_no));
797 if (edev->max_supported) {
800 struct extcon_cable *cable;
802 edev->cables = kzalloc(sizeof(struct extcon_cable) *
803 edev->max_supported, GFP_KERNEL);
806 goto err_sysfs_alloc;
808 for (index = 0; index < edev->max_supported; index++) {
809 cable = &edev->cables[index];
811 snprintf(buf, 10, "cable.%d", index);
812 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
815 for (index--; index >= 0; index--) {
816 cable = &edev->cables[index];
817 kfree(cable->attr_g.name);
821 goto err_alloc_cables;
826 cable->cable_index = index;
827 cable->attrs[0] = &cable->attr_name.attr;
828 cable->attrs[1] = &cable->attr_state.attr;
829 cable->attrs[2] = NULL;
830 cable->attr_g.name = str;
831 cable->attr_g.attrs = cable->attrs;
833 sysfs_attr_init(&cable->attr_name.attr);
834 cable->attr_name.attr.name = "name";
835 cable->attr_name.attr.mode = 0444;
836 cable->attr_name.show = cable_name_show;
838 sysfs_attr_init(&cable->attr_state.attr);
839 cable->attr_state.attr.name = "state";
840 cable->attr_state.attr.mode = 0444;
841 cable->attr_state.show = cable_state_show;
845 if (edev->max_supported && edev->mutually_exclusive) {
849 /* Count the size of mutually_exclusive array */
850 for (index = 0; edev->mutually_exclusive[index]; index++)
853 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
854 (index + 1), GFP_KERNEL);
855 if (!edev->attrs_muex) {
860 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
862 if (!edev->d_attrs_muex) {
864 kfree(edev->attrs_muex);
868 for (index = 0; edev->mutually_exclusive[index]; index++) {
869 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
870 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
873 for (index--; index >= 0; index--) {
874 kfree(edev->d_attrs_muex[index].attr.
877 kfree(edev->d_attrs_muex);
878 kfree(edev->attrs_muex);
883 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
884 edev->d_attrs_muex[index].attr.name = name;
885 edev->d_attrs_muex[index].attr.mode = 0000;
886 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
889 edev->attr_g_muex.name = muex_name;
890 edev->attr_g_muex.attrs = edev->attrs_muex;
894 if (edev->max_supported) {
895 edev->extcon_dev_type.groups =
896 kzalloc(sizeof(struct attribute_group *) *
897 (edev->max_supported + 2), GFP_KERNEL);
898 if (!edev->extcon_dev_type.groups) {
900 goto err_alloc_groups;
903 edev->extcon_dev_type.name = dev_name(&edev->dev);
904 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
906 for (index = 0; index < edev->max_supported; index++)
907 edev->extcon_dev_type.groups[index] =
908 &edev->cables[index].attr_g;
909 if (edev->mutually_exclusive)
910 edev->extcon_dev_type.groups[index] =
913 edev->dev.type = &edev->extcon_dev_type;
916 ret = device_register(&edev->dev);
918 put_device(&edev->dev);
921 #if defined(CONFIG_ANDROID)
923 ret = class_compat_create_link(switch_class, &edev->dev, NULL);
924 #endif /* CONFIG_ANDROID */
926 spin_lock_init(&edev->lock);
928 edev->nh = devm_kzalloc(&edev->dev,
929 sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL);
935 for (index = 0; index < edev->max_supported; index++)
936 RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
938 dev_set_drvdata(&edev->dev, edev);
941 mutex_lock(&extcon_dev_list_lock);
942 list_add(&edev->entry, &extcon_dev_list);
943 mutex_unlock(&extcon_dev_list_lock);
948 if (edev->max_supported)
949 kfree(edev->extcon_dev_type.groups);
951 if (edev->max_supported && edev->mutually_exclusive) {
952 for (index = 0; edev->mutually_exclusive[index]; index++)
953 kfree(edev->d_attrs_muex[index].attr.name);
954 kfree(edev->d_attrs_muex);
955 kfree(edev->attrs_muex);
958 for (index = 0; index < edev->max_supported; index++)
959 kfree(edev->cables[index].attr_g.name);
961 if (edev->max_supported)
966 EXPORT_SYMBOL_GPL(extcon_dev_register);
969 * extcon_dev_unregister() - Unregister the extcon device.
970 * @edev: the extcon device instance to be unregistered.
972 * Note that this does not call kfree(edev) because edev was not allocated
975 void extcon_dev_unregister(struct extcon_dev *edev)
982 mutex_lock(&extcon_dev_list_lock);
983 list_del(&edev->entry);
984 mutex_unlock(&extcon_dev_list_lock);
986 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
987 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
988 dev_name(&edev->dev));
992 device_unregister(&edev->dev);
994 if (edev->mutually_exclusive && edev->max_supported) {
995 for (index = 0; edev->mutually_exclusive[index];
997 kfree(edev->d_attrs_muex[index].attr.name);
998 kfree(edev->d_attrs_muex);
999 kfree(edev->attrs_muex);
1002 for (index = 0; index < edev->max_supported; index++)
1003 kfree(edev->cables[index].attr_g.name);
1005 if (edev->max_supported) {
1006 kfree(edev->extcon_dev_type.groups);
1007 kfree(edev->cables);
1010 #if defined(CONFIG_ANDROID)
1012 class_compat_remove_link(switch_class, &edev->dev, NULL);
1014 put_device(&edev->dev);
1016 EXPORT_SYMBOL_GPL(extcon_dev_unregister);
1018 static void devm_extcon_dev_unreg(struct device *dev, void *res)
1020 extcon_dev_unregister(*(struct extcon_dev **)res);
1024 * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
1025 * @dev: device to allocate extcon device
1026 * @edev: the new extcon device to register
1028 * Managed extcon_dev_register() function. If extcon device is attached with
1029 * this function, that extcon device is automatically unregistered on driver
1030 * detach. Internally this function calls extcon_dev_register() function.
1031 * To get more information, refer that function.
1033 * If extcon device is registered with this function and the device needs to be
1034 * unregistered separately, devm_extcon_dev_unregister() should be used.
1036 * Returns 0 if success or negaive error number if failure.
1038 int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
1040 struct extcon_dev **ptr;
1043 ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
1047 ret = extcon_dev_register(edev);
1054 devres_add(dev, ptr);
1058 EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
1061 * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
1062 * @dev: device the extcon belongs to
1063 * @edev: the extcon device to unregister
1065 * Unregister extcon device that is registered with devm_extcon_dev_register()
1068 void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
1070 WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
1071 devm_extcon_dev_match, edev));
1073 EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
1077 * extcon_get_edev_by_phandle - Get the extcon device from devicetree
1078 * @dev - instance to the given device
1079 * @index - index into list of extcon_dev
1081 * return the instance of extcon device
1083 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1085 struct device_node *node;
1086 struct extcon_dev *edev;
1089 return ERR_PTR(-EINVAL);
1091 if (!dev->of_node) {
1092 dev_err(dev, "device does not have a device node entry\n");
1093 return ERR_PTR(-EINVAL);
1096 node = of_parse_phandle(dev->of_node, "extcon", index);
1098 dev_err(dev, "failed to get phandle in %s node\n",
1099 dev->of_node->full_name);
1100 return ERR_PTR(-ENODEV);
1103 mutex_lock(&extcon_dev_list_lock);
1104 list_for_each_entry(edev, &extcon_dev_list, entry) {
1105 if (edev->dev.parent && edev->dev.parent->of_node == node) {
1106 mutex_unlock(&extcon_dev_list_lock);
1110 mutex_unlock(&extcon_dev_list_lock);
1112 return ERR_PTR(-EPROBE_DEFER);
1115 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
1117 return ERR_PTR(-ENOSYS);
1119 #endif /* CONFIG_OF */
1120 EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
1123 * extcon_get_edev_name() - Get the name of the extcon device.
1124 * @edev: the extcon device
1126 const char *extcon_get_edev_name(struct extcon_dev *edev)
1128 return !edev ? NULL : edev->name;
1131 static int __init extcon_class_init(void)
1133 return create_extcon_class();
1135 module_init(extcon_class_init);
1137 static void __exit extcon_class_exit(void)
1139 #if defined(CONFIG_ANDROID)
1140 class_compat_unregister(switch_class);
1142 class_destroy(extcon_class);
1144 module_exit(extcon_class_exit);
1146 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
1147 MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
1148 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
1149 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1150 MODULE_DESCRIPTION("External connector (extcon) class driver");
1151 MODULE_LICENSE("GPL");