2 * The Serio abstraction module
4 * Copyright (c) 1999-2004 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 * Copyright (c) 2003 Daniele Bellucci
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31 #include <linux/stddef.h>
32 #include <linux/module.h>
33 #include <linux/serio.h>
34 #include <linux/errno.h>
35 #include <linux/sched.h>
36 #include <linux/slab.h>
37 #include <linux/workqueue.h>
38 #include <linux/mutex.h>
40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
41 MODULE_DESCRIPTION("Serio abstraction core");
42 MODULE_LICENSE("GPL");
45 * serio_mutex protects entire serio subsystem and is taken every time
46 * serio port or driver registered or unregistered.
48 static DEFINE_MUTEX(serio_mutex);
50 static LIST_HEAD(serio_list);
52 static struct bus_type serio_bus;
54 static void serio_add_port(struct serio *serio);
55 static int serio_reconnect_port(struct serio *serio);
56 static void serio_disconnect_port(struct serio *serio);
57 static void serio_reconnect_subtree(struct serio *serio);
58 static void serio_attach_driver(struct serio_driver *drv);
60 static int serio_connect_driver(struct serio *serio, struct serio_driver *drv)
64 mutex_lock(&serio->drv_mutex);
65 retval = drv->connect(serio, drv);
66 mutex_unlock(&serio->drv_mutex);
71 static int serio_reconnect_driver(struct serio *serio)
75 mutex_lock(&serio->drv_mutex);
76 if (serio->drv && serio->drv->reconnect)
77 retval = serio->drv->reconnect(serio);
78 mutex_unlock(&serio->drv_mutex);
83 static void serio_disconnect_driver(struct serio *serio)
85 mutex_lock(&serio->drv_mutex);
87 serio->drv->disconnect(serio);
88 mutex_unlock(&serio->drv_mutex);
91 static int serio_match_port(const struct serio_device_id *ids, struct serio *serio)
93 while (ids->type || ids->proto) {
94 if ((ids->type == SERIO_ANY || ids->type == serio->id.type) &&
95 (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) &&
96 (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) &&
97 (ids->id == SERIO_ANY || ids->id == serio->id.id))
105 * Basic serio -> driver core mappings
108 static int serio_bind_driver(struct serio *serio, struct serio_driver *drv)
112 if (serio_match_port(drv->id_table, serio)) {
114 serio->dev.driver = &drv->driver;
115 if (serio_connect_driver(serio, drv)) {
116 serio->dev.driver = NULL;
120 error = device_bind_driver(&serio->dev);
122 dev_warn(&serio->dev,
123 "device_bind_driver() failed for %s (%s) and %s, error: %d\n",
124 serio->phys, serio->name,
125 drv->description, error);
126 serio_disconnect_driver(serio);
127 serio->dev.driver = NULL;
134 static void serio_find_driver(struct serio *serio)
138 error = device_attach(&serio->dev);
140 dev_warn(&serio->dev,
141 "device_attach() failed for %s (%s), error: %d\n",
142 serio->phys, serio->name, error);
147 * Serio event processing.
150 enum serio_event_type {
152 SERIO_RECONNECT_PORT,
153 SERIO_RECONNECT_SUBTREE,
159 enum serio_event_type type;
161 struct module *owner;
162 struct list_head node;
165 static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */
166 static LIST_HEAD(serio_event_list);
168 static struct serio_event *serio_get_event(void)
170 struct serio_event *event = NULL;
173 spin_lock_irqsave(&serio_event_lock, flags);
175 if (!list_empty(&serio_event_list)) {
176 event = list_first_entry(&serio_event_list,
177 struct serio_event, node);
178 list_del_init(&event->node);
181 spin_unlock_irqrestore(&serio_event_lock, flags);
185 static void serio_free_event(struct serio_event *event)
187 module_put(event->owner);
191 static void serio_remove_duplicate_events(void *object,
192 enum serio_event_type type)
194 struct serio_event *e, *next;
197 spin_lock_irqsave(&serio_event_lock, flags);
199 list_for_each_entry_safe(e, next, &serio_event_list, node) {
200 if (object == e->object) {
202 * If this event is of different type we should not
203 * look further - we only suppress duplicate events
204 * that were sent back-to-back.
209 list_del_init(&e->node);
214 spin_unlock_irqrestore(&serio_event_lock, flags);
217 static void serio_handle_event(struct work_struct *work)
219 struct serio_event *event;
221 mutex_lock(&serio_mutex);
223 while ((event = serio_get_event())) {
225 switch (event->type) {
227 case SERIO_REGISTER_PORT:
228 serio_add_port(event->object);
231 case SERIO_RECONNECT_PORT:
232 serio_reconnect_port(event->object);
235 case SERIO_RESCAN_PORT:
236 serio_disconnect_port(event->object);
237 serio_find_driver(event->object);
240 case SERIO_RECONNECT_SUBTREE:
241 serio_reconnect_subtree(event->object);
244 case SERIO_ATTACH_DRIVER:
245 serio_attach_driver(event->object);
249 serio_remove_duplicate_events(event->object, event->type);
250 serio_free_event(event);
253 mutex_unlock(&serio_mutex);
256 static DECLARE_WORK(serio_event_work, serio_handle_event);
258 static int serio_queue_event(void *object, struct module *owner,
259 enum serio_event_type event_type)
262 struct serio_event *event;
265 spin_lock_irqsave(&serio_event_lock, flags);
268 * Scan event list for the other events for the same serio port,
269 * starting with the most recent one. If event is the same we
270 * do not need add new one. If event is of different type we
271 * need to add this event and should not look further because
272 * we need to preseve sequence of distinct events.
274 list_for_each_entry_reverse(event, &serio_event_list, node) {
275 if (event->object == object) {
276 if (event->type == event_type)
282 event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC);
284 pr_err("Not enough memory to queue event %d\n", event_type);
289 if (!try_module_get(owner)) {
290 pr_warning("Can't get module reference, dropping event %d\n",
297 event->type = event_type;
298 event->object = object;
299 event->owner = owner;
301 list_add_tail(&event->node, &serio_event_list);
302 queue_work(system_long_wq, &serio_event_work);
305 spin_unlock_irqrestore(&serio_event_lock, flags);
310 * Remove all events that have been submitted for a given
311 * object, be it serio port or driver.
313 static void serio_remove_pending_events(void *object)
315 struct serio_event *event, *next;
318 spin_lock_irqsave(&serio_event_lock, flags);
320 list_for_each_entry_safe(event, next, &serio_event_list, node) {
321 if (event->object == object) {
322 list_del_init(&event->node);
323 serio_free_event(event);
327 spin_unlock_irqrestore(&serio_event_lock, flags);
331 * Locate child serio port (if any) that has not been fully registered yet.
333 * Children are registered by driver's connect() handler so there can't be a
334 * grandchild pending registration together with a child.
336 static struct serio *serio_get_pending_child(struct serio *parent)
338 struct serio_event *event;
339 struct serio *serio, *child = NULL;
342 spin_lock_irqsave(&serio_event_lock, flags);
344 list_for_each_entry(event, &serio_event_list, node) {
345 if (event->type == SERIO_REGISTER_PORT) {
346 serio = event->object;
347 if (serio->parent == parent) {
354 spin_unlock_irqrestore(&serio_event_lock, flags);
359 * Serio port operations
362 static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf)
364 struct serio *serio = to_serio_port(dev);
365 return sprintf(buf, "%s\n", serio->name);
368 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
370 struct serio *serio = to_serio_port(dev);
372 return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n",
373 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
376 static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
378 struct serio *serio = to_serio_port(dev);
379 return sprintf(buf, "%02x\n", serio->id.type);
382 static ssize_t proto_show(struct device *dev, struct device_attribute *attr, char *buf)
384 struct serio *serio = to_serio_port(dev);
385 return sprintf(buf, "%02x\n", serio->id.proto);
388 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
390 struct serio *serio = to_serio_port(dev);
391 return sprintf(buf, "%02x\n", serio->id.id);
394 static ssize_t extra_show(struct device *dev, struct device_attribute *attr, char *buf)
396 struct serio *serio = to_serio_port(dev);
397 return sprintf(buf, "%02x\n", serio->id.extra);
400 static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
402 struct serio *serio = to_serio_port(dev);
403 struct device_driver *drv;
406 error = mutex_lock_interruptible(&serio_mutex);
410 if (!strncmp(buf, "none", count)) {
411 serio_disconnect_port(serio);
412 } else if (!strncmp(buf, "reconnect", count)) {
413 serio_reconnect_subtree(serio);
414 } else if (!strncmp(buf, "rescan", count)) {
415 serio_disconnect_port(serio);
416 serio_find_driver(serio);
417 serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
418 } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
419 serio_disconnect_port(serio);
420 error = serio_bind_driver(serio, to_serio_driver(drv));
421 serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
426 mutex_unlock(&serio_mutex);
428 return error ? error : count;
431 static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
433 struct serio *serio = to_serio_port(dev);
434 return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
437 static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
439 struct serio *serio = to_serio_port(dev);
443 if (!strncmp(buf, "manual", count)) {
444 serio->manual_bind = true;
445 } else if (!strncmp(buf, "auto", count)) {
446 serio->manual_bind = false;
454 static DEVICE_ATTR_RO(type);
455 static DEVICE_ATTR_RO(proto);
456 static DEVICE_ATTR_RO(id);
457 static DEVICE_ATTR_RO(extra);
458 static DEVICE_ATTR_RO(modalias);
459 static DEVICE_ATTR_WO(drvctl);
460 static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL);
461 static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode);
463 static struct attribute *serio_device_id_attrs[] = {
465 &dev_attr_proto.attr,
467 &dev_attr_extra.attr,
468 &dev_attr_modalias.attr,
469 &dev_attr_description.attr,
470 &dev_attr_drvctl.attr,
471 &dev_attr_bind_mode.attr,
475 static struct attribute_group serio_id_attr_group = {
477 .attrs = serio_device_id_attrs,
480 static const struct attribute_group *serio_device_attr_groups[] = {
481 &serio_id_attr_group,
485 static void serio_release_port(struct device *dev)
487 struct serio *serio = to_serio_port(dev);
490 module_put(THIS_MODULE);
494 * Prepare serio port for registration.
496 static void serio_init_port(struct serio *serio)
498 static atomic_t serio_no = ATOMIC_INIT(0);
500 __module_get(THIS_MODULE);
502 INIT_LIST_HEAD(&serio->node);
503 INIT_LIST_HEAD(&serio->child_node);
504 INIT_LIST_HEAD(&serio->children);
505 spin_lock_init(&serio->lock);
506 mutex_init(&serio->drv_mutex);
507 device_initialize(&serio->dev);
508 dev_set_name(&serio->dev, "serio%ld",
509 (long)atomic_inc_return(&serio_no) - 1);
510 serio->dev.bus = &serio_bus;
511 serio->dev.release = serio_release_port;
512 serio->dev.groups = serio_device_attr_groups;
514 serio->dev.parent = &serio->parent->dev;
515 serio->depth = serio->parent->depth + 1;
518 lockdep_set_subclass(&serio->lock, serio->depth);
522 * Complete serio port registration.
523 * Driver core will attempt to find appropriate driver for the port.
525 static void serio_add_port(struct serio *serio)
527 struct serio *parent = serio->parent;
531 serio_pause_rx(parent);
532 list_add_tail(&serio->child_node, &parent->children);
533 serio_continue_rx(parent);
536 list_add_tail(&serio->node, &serio_list);
541 error = device_add(&serio->dev);
544 "device_add() failed for %s (%s), error: %d\n",
545 serio->phys, serio->name, error);
549 * serio_destroy_port() completes unregistration process and removes
550 * port from the system
552 static void serio_destroy_port(struct serio *serio)
556 while ((child = serio_get_pending_child(serio)) != NULL) {
557 serio_remove_pending_events(child);
558 put_device(&child->dev);
565 serio_pause_rx(serio->parent);
566 list_del_init(&serio->child_node);
567 serio_continue_rx(serio->parent);
568 serio->parent = NULL;
571 if (device_is_registered(&serio->dev))
572 device_del(&serio->dev);
574 list_del_init(&serio->node);
575 serio_remove_pending_events(serio);
576 put_device(&serio->dev);
580 * Reconnect serio port (re-initialize attached device).
581 * If reconnect fails (old device is no longer attached or
582 * there was no device to begin with) we do full rescan in
583 * hope of finding a driver for the port.
585 static int serio_reconnect_port(struct serio *serio)
587 int error = serio_reconnect_driver(serio);
590 serio_disconnect_port(serio);
591 serio_find_driver(serio);
598 * Reconnect serio port and all its children (re-initialize attached
601 static void serio_reconnect_subtree(struct serio *root)
603 struct serio *s = root;
607 error = serio_reconnect_port(s);
610 * Reconnect was successful, move on to do the
613 if (!list_empty(&s->children)) {
614 s = list_first_entry(&s->children,
615 struct serio, child_node);
621 * Either it was a leaf node or reconnect failed and it
622 * became a leaf node. Continue reconnecting starting with
623 * the next sibling of the parent node.
626 struct serio *parent = s->parent;
628 if (!list_is_last(&s->child_node, &parent->children)) {
629 s = list_entry(s->child_node.next,
630 struct serio, child_node);
640 * serio_disconnect_port() unbinds a port from its driver. As a side effect
641 * all children ports are unbound and destroyed.
643 static void serio_disconnect_port(struct serio *serio)
645 struct serio *s = serio;
648 * Children ports should be disconnected and destroyed
649 * first; we travel the tree in depth-first order.
651 while (!list_empty(&serio->children)) {
654 while (!list_empty(&s->children))
655 s = list_first_entry(&s->children,
656 struct serio, child_node);
659 * Prune this leaf node unless it is the one we
663 struct serio *parent = s->parent;
665 device_release_driver(&s->dev);
666 serio_destroy_port(s);
673 * OK, no children left, now disconnect this port.
675 device_release_driver(&serio->dev);
678 void serio_rescan(struct serio *serio)
680 serio_queue_event(serio, NULL, SERIO_RESCAN_PORT);
682 EXPORT_SYMBOL(serio_rescan);
684 void serio_reconnect(struct serio *serio)
686 serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE);
688 EXPORT_SYMBOL(serio_reconnect);
691 * Submits register request to kseriod for subsequent execution.
692 * Note that port registration is always asynchronous.
694 void __serio_register_port(struct serio *serio, struct module *owner)
696 serio_init_port(serio);
697 serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
699 EXPORT_SYMBOL(__serio_register_port);
702 * Synchronously unregisters serio port.
704 void serio_unregister_port(struct serio *serio)
706 mutex_lock(&serio_mutex);
707 serio_disconnect_port(serio);
708 serio_destroy_port(serio);
709 mutex_unlock(&serio_mutex);
711 EXPORT_SYMBOL(serio_unregister_port);
714 * Safely unregisters children ports if they are present.
716 void serio_unregister_child_port(struct serio *serio)
718 struct serio *s, *next;
720 mutex_lock(&serio_mutex);
721 list_for_each_entry_safe(s, next, &serio->children, child_node) {
722 serio_disconnect_port(s);
723 serio_destroy_port(s);
725 mutex_unlock(&serio_mutex);
727 EXPORT_SYMBOL(serio_unregister_child_port);
731 * Serio driver operations
734 static ssize_t description_show(struct device_driver *drv, char *buf)
736 struct serio_driver *driver = to_serio_driver(drv);
737 return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
739 static DRIVER_ATTR_RO(description);
741 static ssize_t bind_mode_show(struct device_driver *drv, char *buf)
743 struct serio_driver *serio_drv = to_serio_driver(drv);
744 return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto");
747 static ssize_t bind_mode_store(struct device_driver *drv, const char *buf, size_t count)
749 struct serio_driver *serio_drv = to_serio_driver(drv);
753 if (!strncmp(buf, "manual", count)) {
754 serio_drv->manual_bind = true;
755 } else if (!strncmp(buf, "auto", count)) {
756 serio_drv->manual_bind = false;
763 static DRIVER_ATTR_RW(bind_mode);
765 static struct attribute *serio_driver_attrs[] = {
766 &driver_attr_description.attr,
767 &driver_attr_bind_mode.attr,
770 ATTRIBUTE_GROUPS(serio_driver);
772 static int serio_driver_probe(struct device *dev)
774 struct serio *serio = to_serio_port(dev);
775 struct serio_driver *drv = to_serio_driver(dev->driver);
777 return serio_connect_driver(serio, drv);
780 static int serio_driver_remove(struct device *dev)
782 struct serio *serio = to_serio_port(dev);
784 serio_disconnect_driver(serio);
788 static void serio_cleanup(struct serio *serio)
790 mutex_lock(&serio->drv_mutex);
791 if (serio->drv && serio->drv->cleanup)
792 serio->drv->cleanup(serio);
793 mutex_unlock(&serio->drv_mutex);
796 static void serio_shutdown(struct device *dev)
798 struct serio *serio = to_serio_port(dev);
800 serio_cleanup(serio);
803 static void serio_attach_driver(struct serio_driver *drv)
807 error = driver_attach(&drv->driver);
809 pr_warning("driver_attach() failed for %s with error %d\n",
810 drv->driver.name, error);
813 int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name)
815 bool manual_bind = drv->manual_bind;
818 drv->driver.bus = &serio_bus;
819 drv->driver.owner = owner;
820 drv->driver.mod_name = mod_name;
823 * Temporarily disable automatic binding because probing
824 * takes long time and we are better off doing it in kseriod
826 drv->manual_bind = true;
828 error = driver_register(&drv->driver);
830 pr_err("driver_register() failed for %s, error: %d\n",
831 drv->driver.name, error);
836 * Restore original bind mode and let kseriod bind the
837 * driver to free ports
840 drv->manual_bind = false;
841 error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER);
843 driver_unregister(&drv->driver);
850 EXPORT_SYMBOL(__serio_register_driver);
852 void serio_unregister_driver(struct serio_driver *drv)
856 mutex_lock(&serio_mutex);
858 drv->manual_bind = true; /* so serio_find_driver ignores it */
859 serio_remove_pending_events(drv);
862 list_for_each_entry(serio, &serio_list, node) {
863 if (serio->drv == drv) {
864 serio_disconnect_port(serio);
865 serio_find_driver(serio);
866 /* we could've deleted some ports, restart */
871 driver_unregister(&drv->driver);
872 mutex_unlock(&serio_mutex);
874 EXPORT_SYMBOL(serio_unregister_driver);
876 static void serio_set_drv(struct serio *serio, struct serio_driver *drv)
878 serio_pause_rx(serio);
880 serio_continue_rx(serio);
883 static int serio_bus_match(struct device *dev, struct device_driver *drv)
885 struct serio *serio = to_serio_port(dev);
886 struct serio_driver *serio_drv = to_serio_driver(drv);
888 if (serio->manual_bind || serio_drv->manual_bind)
891 return serio_match_port(serio_drv->id_table, serio);
894 #define SERIO_ADD_UEVENT_VAR(fmt, val...) \
896 int err = add_uevent_var(env, fmt, val); \
901 static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
908 serio = to_serio_port(dev);
910 SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type);
911 SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto);
912 SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id);
913 SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra);
914 SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X",
915 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
919 #undef SERIO_ADD_UEVENT_VAR
922 static int serio_suspend(struct device *dev)
924 struct serio *serio = to_serio_port(dev);
926 serio_cleanup(serio);
931 static int serio_resume(struct device *dev)
933 struct serio *serio = to_serio_port(dev);
936 * Driver reconnect can take a while, so better let kseriod
939 serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
944 static const struct dev_pm_ops serio_pm_ops = {
945 .suspend = serio_suspend,
946 .resume = serio_resume,
947 .poweroff = serio_suspend,
948 .restore = serio_resume,
950 #endif /* CONFIG_PM */
952 /* called from serio_driver->connect/disconnect methods under serio_mutex */
953 int serio_open(struct serio *serio, struct serio_driver *drv)
955 serio_set_drv(serio, drv);
957 if (serio->open && serio->open(serio)) {
958 serio_set_drv(serio, NULL);
963 EXPORT_SYMBOL(serio_open);
965 /* called from serio_driver->connect/disconnect methods under serio_mutex */
966 void serio_close(struct serio *serio)
971 serio_set_drv(serio, NULL);
973 EXPORT_SYMBOL(serio_close);
975 irqreturn_t serio_interrupt(struct serio *serio,
976 unsigned char data, unsigned int dfl)
979 irqreturn_t ret = IRQ_NONE;
981 spin_lock_irqsave(&serio->lock, flags);
983 if (likely(serio->drv)) {
984 ret = serio->drv->interrupt(serio, data, dfl);
985 } else if (!dfl && device_is_registered(&serio->dev)) {
990 spin_unlock_irqrestore(&serio->lock, flags);
994 EXPORT_SYMBOL(serio_interrupt);
996 static struct bus_type serio_bus = {
998 .drv_groups = serio_driver_groups,
999 .match = serio_bus_match,
1000 .uevent = serio_uevent,
1001 .probe = serio_driver_probe,
1002 .remove = serio_driver_remove,
1003 .shutdown = serio_shutdown,
1005 .pm = &serio_pm_ops,
1009 static int __init serio_init(void)
1013 error = bus_register(&serio_bus);
1015 pr_err("Failed to register serio bus, error: %d\n", error);
1022 static void __exit serio_exit(void)
1024 bus_unregister(&serio_bus);
1027 * There should not be any outstanding events but work may
1028 * still be scheduled so simply cancel it.
1030 cancel_work_sync(&serio_event_work);
1033 subsys_initcall(serio_init);
1034 module_exit(serio_exit);