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 #include <linux/stddef.h>
30 #include <linux/module.h>
31 #include <linux/serio.h>
32 #include <linux/errno.h>
33 #include <linux/wait.h>
34 #include <linux/sched.h>
35 #include <linux/slab.h>
36 #include <linux/kthread.h>
37 #include <linux/mutex.h>
38 #include <linux/freezer.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 registrered 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_chain(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);
123 "serio: device_bind_driver() failed "
124 "for %s (%s) and %s, error: %d\n",
125 serio->phys, serio->name,
126 drv->description, error);
127 serio_disconnect_driver(serio);
128 serio->dev.driver = NULL;
135 static void serio_find_driver(struct serio *serio)
139 error = device_attach(&serio->dev);
142 "serio: device_attach() failed for %s (%s), error: %d\n",
143 serio->phys, serio->name, error);
148 * Serio event processing.
151 enum serio_event_type {
153 SERIO_RECONNECT_PORT,
154 SERIO_RECONNECT_CHAIN,
160 enum serio_event_type type;
162 struct module *owner;
163 struct list_head node;
166 static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */
167 static LIST_HEAD(serio_event_list);
168 static DECLARE_WAIT_QUEUE_HEAD(serio_wait);
169 static struct task_struct *serio_task;
171 static int serio_queue_event(void *object, struct module *owner,
172 enum serio_event_type event_type)
175 struct serio_event *event;
178 spin_lock_irqsave(&serio_event_lock, flags);
181 * Scan event list for the other events for the same serio port,
182 * starting with the most recent one. If event is the same we
183 * do not need add new one. If event is of different type we
184 * need to add this event and should not look further because
185 * we need to preseve sequence of distinct events.
187 list_for_each_entry_reverse(event, &serio_event_list, node) {
188 if (event->object == object) {
189 if (event->type == event_type)
195 event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC);
198 "serio: Not enough memory to queue event %d\n",
204 if (!try_module_get(owner)) {
206 "serio: Can't get module reference, dropping event %d\n",
213 event->type = event_type;
214 event->object = object;
215 event->owner = owner;
217 list_add_tail(&event->node, &serio_event_list);
218 wake_up(&serio_wait);
221 spin_unlock_irqrestore(&serio_event_lock, flags);
225 static void serio_free_event(struct serio_event *event)
227 module_put(event->owner);
231 static void serio_remove_duplicate_events(struct serio_event *event)
233 struct list_head *node, *next;
234 struct serio_event *e;
237 spin_lock_irqsave(&serio_event_lock, flags);
239 list_for_each_safe(node, next, &serio_event_list) {
240 e = list_entry(node, struct serio_event, node);
241 if (event->object == e->object) {
243 * If this event is of different type we should not
244 * look further - we only suppress duplicate events
245 * that were sent back-to-back.
247 if (event->type != e->type)
255 spin_unlock_irqrestore(&serio_event_lock, flags);
259 static struct serio_event *serio_get_event(void)
261 struct serio_event *event;
262 struct list_head *node;
265 spin_lock_irqsave(&serio_event_lock, flags);
267 if (list_empty(&serio_event_list)) {
268 spin_unlock_irqrestore(&serio_event_lock, flags);
272 node = serio_event_list.next;
273 event = list_entry(node, struct serio_event, node);
276 spin_unlock_irqrestore(&serio_event_lock, flags);
281 static void serio_handle_event(void)
283 struct serio_event *event;
285 mutex_lock(&serio_mutex);
288 * Note that we handle only one event here to give swsusp
289 * a chance to freeze kseriod thread. Serio events should
290 * be pretty rare so we are not concerned about taking
293 if ((event = serio_get_event())) {
295 switch (event->type) {
296 case SERIO_REGISTER_PORT:
297 serio_add_port(event->object);
300 case SERIO_RECONNECT_PORT:
301 serio_reconnect_port(event->object);
304 case SERIO_RESCAN_PORT:
305 serio_disconnect_port(event->object);
306 serio_find_driver(event->object);
309 case SERIO_RECONNECT_CHAIN:
310 serio_reconnect_chain(event->object);
313 case SERIO_ATTACH_DRIVER:
314 serio_attach_driver(event->object);
321 serio_remove_duplicate_events(event);
322 serio_free_event(event);
325 mutex_unlock(&serio_mutex);
329 * Remove all events that have been submitted for a given
330 * object, be it serio port or driver.
332 static void serio_remove_pending_events(void *object)
334 struct list_head *node, *next;
335 struct serio_event *event;
338 spin_lock_irqsave(&serio_event_lock, flags);
340 list_for_each_safe(node, next, &serio_event_list) {
341 event = list_entry(node, struct serio_event, node);
342 if (event->object == object) {
344 serio_free_event(event);
348 spin_unlock_irqrestore(&serio_event_lock, flags);
352 * Destroy child serio port (if any) that has not been fully registered yet.
354 * Note that we rely on the fact that port can have only one child and therefore
355 * only one child registration request can be pending. Additionally, children
356 * are registered by driver's connect() handler so there can't be a grandchild
357 * pending registration together with a child.
359 static struct serio *serio_get_pending_child(struct serio *parent)
361 struct serio_event *event;
362 struct serio *serio, *child = NULL;
365 spin_lock_irqsave(&serio_event_lock, flags);
367 list_for_each_entry(event, &serio_event_list, node) {
368 if (event->type == SERIO_REGISTER_PORT) {
369 serio = event->object;
370 if (serio->parent == parent) {
377 spin_unlock_irqrestore(&serio_event_lock, flags);
381 static int serio_thread(void *nothing)
385 serio_handle_event();
386 wait_event_freezable(serio_wait,
387 kthread_should_stop() || !list_empty(&serio_event_list));
388 } while (!kthread_should_stop());
390 printk(KERN_DEBUG "serio: kseriod exiting\n");
396 * Serio port operations
399 static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf)
401 struct serio *serio = to_serio_port(dev);
402 return sprintf(buf, "%s\n", serio->name);
405 static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
407 struct serio *serio = to_serio_port(dev);
409 return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n",
410 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
413 static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf)
415 struct serio *serio = to_serio_port(dev);
416 return sprintf(buf, "%02x\n", serio->id.type);
419 static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf)
421 struct serio *serio = to_serio_port(dev);
422 return sprintf(buf, "%02x\n", serio->id.proto);
425 static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf)
427 struct serio *serio = to_serio_port(dev);
428 return sprintf(buf, "%02x\n", serio->id.id);
431 static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf)
433 struct serio *serio = to_serio_port(dev);
434 return sprintf(buf, "%02x\n", serio->id.extra);
437 static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL);
438 static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL);
439 static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL);
440 static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL);
442 static struct attribute *serio_device_id_attrs[] = {
444 &dev_attr_proto.attr,
446 &dev_attr_extra.attr,
450 static struct attribute_group serio_id_attr_group = {
452 .attrs = serio_device_id_attrs,
455 static const struct attribute_group *serio_device_attr_groups[] = {
456 &serio_id_attr_group,
460 static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
462 struct serio *serio = to_serio_port(dev);
463 struct device_driver *drv;
466 error = mutex_lock_interruptible(&serio_mutex);
470 if (!strncmp(buf, "none", count)) {
471 serio_disconnect_port(serio);
472 } else if (!strncmp(buf, "reconnect", count)) {
473 serio_reconnect_chain(serio);
474 } else if (!strncmp(buf, "rescan", count)) {
475 serio_disconnect_port(serio);
476 serio_find_driver(serio);
477 } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
478 serio_disconnect_port(serio);
479 error = serio_bind_driver(serio, to_serio_driver(drv));
485 mutex_unlock(&serio_mutex);
487 return error ? error : count;
490 static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
492 struct serio *serio = to_serio_port(dev);
493 return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
496 static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
498 struct serio *serio = to_serio_port(dev);
502 if (!strncmp(buf, "manual", count)) {
503 serio->manual_bind = true;
504 } else if (!strncmp(buf, "auto", count)) {
505 serio->manual_bind = false;
513 static struct device_attribute serio_device_attrs[] = {
514 __ATTR(description, S_IRUGO, serio_show_description, NULL),
515 __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL),
516 __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver),
517 __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
522 static void serio_release_port(struct device *dev)
524 struct serio *serio = to_serio_port(dev);
527 module_put(THIS_MODULE);
531 * Prepare serio port for registration.
533 static void serio_init_port(struct serio *serio)
535 static atomic_t serio_no = ATOMIC_INIT(0);
537 __module_get(THIS_MODULE);
539 INIT_LIST_HEAD(&serio->node);
540 spin_lock_init(&serio->lock);
541 mutex_init(&serio->drv_mutex);
542 device_initialize(&serio->dev);
543 dev_set_name(&serio->dev, "serio%ld",
544 (long)atomic_inc_return(&serio_no) - 1);
545 serio->dev.bus = &serio_bus;
546 serio->dev.release = serio_release_port;
547 serio->dev.groups = serio_device_attr_groups;
549 serio->dev.parent = &serio->parent->dev;
550 serio->depth = serio->parent->depth + 1;
553 lockdep_set_subclass(&serio->lock, serio->depth);
557 * Complete serio port registration.
558 * Driver core will attempt to find appropriate driver for the port.
560 static void serio_add_port(struct serio *serio)
565 serio_pause_rx(serio->parent);
566 serio->parent->child = serio;
567 serio_continue_rx(serio->parent);
570 list_add_tail(&serio->node, &serio_list);
575 error = device_add(&serio->dev);
578 "serio: device_add() failed for %s (%s), error: %d\n",
579 serio->phys, serio->name, error);
581 serio->registered = true;
585 * serio_destroy_port() completes deregistration process and removes
586 * port from the system
588 static void serio_destroy_port(struct serio *serio)
592 child = serio_get_pending_child(serio);
594 serio_remove_pending_events(child);
595 put_device(&child->dev);
602 serio_pause_rx(serio->parent);
603 serio->parent->child = NULL;
604 serio_continue_rx(serio->parent);
605 serio->parent = NULL;
608 if (serio->registered) {
609 device_del(&serio->dev);
610 serio->registered = false;
613 list_del_init(&serio->node);
614 serio_remove_pending_events(serio);
615 put_device(&serio->dev);
619 * Reconnect serio port (re-initialize attached device).
620 * If reconnect fails (old device is no longer attached or
621 * there was no device to begin with) we do full rescan in
622 * hope of finding a driver for the port.
624 static int serio_reconnect_port(struct serio *serio)
626 int error = serio_reconnect_driver(serio);
629 serio_disconnect_port(serio);
630 serio_find_driver(serio);
637 * Reconnect serio port and all its children (re-initialize attached devices)
639 static void serio_reconnect_chain(struct serio *serio)
642 if (serio_reconnect_port(serio)) {
643 /* Ok, old children are now gone, we are done */
646 serio = serio->child;
651 * serio_disconnect_port() unbinds a port from its driver. As a side effect
652 * all child ports are unbound and destroyed.
654 static void serio_disconnect_port(struct serio *serio)
656 struct serio *s, *parent;
660 * Children ports should be disconnected and destroyed
661 * first, staring with the leaf one, since we don't want
664 for (s = serio; s->child; s = s->child)
670 device_release_driver(&s->dev);
671 serio_destroy_port(s);
672 } while ((s = parent) != serio);
676 * Ok, no children left, now disconnect this port
678 device_release_driver(&serio->dev);
681 void serio_rescan(struct serio *serio)
683 serio_queue_event(serio, NULL, SERIO_RESCAN_PORT);
685 EXPORT_SYMBOL(serio_rescan);
687 void serio_reconnect(struct serio *serio)
689 serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN);
691 EXPORT_SYMBOL(serio_reconnect);
694 * Submits register request to kseriod for subsequent execution.
695 * Note that port registration is always asynchronous.
697 void __serio_register_port(struct serio *serio, struct module *owner)
699 serio_init_port(serio);
700 serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
702 EXPORT_SYMBOL(__serio_register_port);
705 * Synchronously unregisters serio port.
707 void serio_unregister_port(struct serio *serio)
709 mutex_lock(&serio_mutex);
710 serio_disconnect_port(serio);
711 serio_destroy_port(serio);
712 mutex_unlock(&serio_mutex);
714 EXPORT_SYMBOL(serio_unregister_port);
717 * Safely unregisters child port if one is present.
719 void serio_unregister_child_port(struct serio *serio)
721 mutex_lock(&serio_mutex);
723 serio_disconnect_port(serio->child);
724 serio_destroy_port(serio->child);
726 mutex_unlock(&serio_mutex);
728 EXPORT_SYMBOL(serio_unregister_child_port);
732 * Serio driver operations
735 static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf)
737 struct serio_driver *driver = to_serio_driver(drv);
738 return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
741 static ssize_t serio_driver_show_bind_mode(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 serio_driver_set_bind_mode(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;
765 static struct driver_attribute serio_driver_attrs[] = {
766 __ATTR(description, S_IRUGO, serio_driver_show_description, NULL),
767 __ATTR(bind_mode, S_IWUSR | S_IRUGO,
768 serio_driver_show_bind_mode, serio_driver_set_bind_mode),
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);
810 "serio: driver_attach() failed for %s with error %d\n",
811 drv->driver.name, error);
814 int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name)
816 bool manual_bind = drv->manual_bind;
819 drv->driver.bus = &serio_bus;
820 drv->driver.owner = owner;
821 drv->driver.mod_name = mod_name;
824 * Temporarily disable automatic binding because probing
825 * takes long time and we are better off doing it in kseriod
827 drv->manual_bind = true;
829 error = driver_register(&drv->driver);
832 "serio: driver_register() failed for %s, error: %d\n",
833 drv->driver.name, error);
838 * Restore original bind mode and let kseriod bind the
839 * driver to free ports
842 drv->manual_bind = false;
843 error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER);
845 driver_unregister(&drv->driver);
852 EXPORT_SYMBOL(__serio_register_driver);
854 void serio_unregister_driver(struct serio_driver *drv)
858 mutex_lock(&serio_mutex);
860 drv->manual_bind = true; /* so serio_find_driver ignores it */
861 serio_remove_pending_events(drv);
864 list_for_each_entry(serio, &serio_list, node) {
865 if (serio->drv == drv) {
866 serio_disconnect_port(serio);
867 serio_find_driver(serio);
868 /* we could've deleted some ports, restart */
873 driver_unregister(&drv->driver);
874 mutex_unlock(&serio_mutex);
876 EXPORT_SYMBOL(serio_unregister_driver);
878 static void serio_set_drv(struct serio *serio, struct serio_driver *drv)
880 serio_pause_rx(serio);
882 serio_continue_rx(serio);
885 static int serio_bus_match(struct device *dev, struct device_driver *drv)
887 struct serio *serio = to_serio_port(dev);
888 struct serio_driver *serio_drv = to_serio_driver(drv);
890 if (serio->manual_bind || serio_drv->manual_bind)
893 return serio_match_port(serio_drv->id_table, serio);
896 #ifdef CONFIG_HOTPLUG
898 #define SERIO_ADD_UEVENT_VAR(fmt, val...) \
900 int err = add_uevent_var(env, fmt, val); \
905 static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
912 serio = to_serio_port(dev);
914 SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type);
915 SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto);
916 SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id);
917 SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra);
918 SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X",
919 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
923 #undef SERIO_ADD_UEVENT_VAR
927 static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
932 #endif /* CONFIG_HOTPLUG */
935 static int serio_suspend(struct device *dev)
937 struct serio *serio = to_serio_port(dev);
939 serio_cleanup(serio);
944 static int serio_resume(struct device *dev)
946 struct serio *serio = to_serio_port(dev);
949 * Driver reconnect can take a while, so better let kseriod
952 serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
957 static const struct dev_pm_ops serio_pm_ops = {
958 .suspend = serio_suspend,
959 .resume = serio_resume,
960 .poweroff = serio_suspend,
961 .restore = serio_resume,
963 #endif /* CONFIG_PM */
965 /* called from serio_driver->connect/disconnect methods under serio_mutex */
966 int serio_open(struct serio *serio, struct serio_driver *drv)
968 serio_set_drv(serio, drv);
970 if (serio->open && serio->open(serio)) {
971 serio_set_drv(serio, NULL);
976 EXPORT_SYMBOL(serio_open);
978 /* called from serio_driver->connect/disconnect methods under serio_mutex */
979 void serio_close(struct serio *serio)
984 serio_set_drv(serio, NULL);
986 EXPORT_SYMBOL(serio_close);
988 irqreturn_t serio_interrupt(struct serio *serio,
989 unsigned char data, unsigned int dfl)
992 irqreturn_t ret = IRQ_NONE;
994 spin_lock_irqsave(&serio->lock, flags);
996 if (likely(serio->drv)) {
997 ret = serio->drv->interrupt(serio, data, dfl);
998 } else if (!dfl && serio->registered) {
1003 spin_unlock_irqrestore(&serio->lock, flags);
1007 EXPORT_SYMBOL(serio_interrupt);
1009 static struct bus_type serio_bus = {
1011 .dev_attrs = serio_device_attrs,
1012 .drv_attrs = serio_driver_attrs,
1013 .match = serio_bus_match,
1014 .uevent = serio_uevent,
1015 .probe = serio_driver_probe,
1016 .remove = serio_driver_remove,
1017 .shutdown = serio_shutdown,
1019 .pm = &serio_pm_ops,
1023 static int __init serio_init(void)
1027 error = bus_register(&serio_bus);
1029 printk(KERN_ERR "serio: failed to register serio bus, error: %d\n", error);
1033 serio_task = kthread_run(serio_thread, NULL, "kseriod");
1034 if (IS_ERR(serio_task)) {
1035 bus_unregister(&serio_bus);
1036 error = PTR_ERR(serio_task);
1037 printk(KERN_ERR "serio: Failed to start kseriod, error: %d\n", error);
1044 static void __exit serio_exit(void)
1046 bus_unregister(&serio_bus);
1047 kthread_stop(serio_task);
1050 subsys_initcall(serio_init);
1051 module_exit(serio_exit);