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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/input/serio/serio.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/input/serio/serio.c')
-rw-r--r--drivers/input/serio/serio.c859
1 files changed, 859 insertions, 0 deletions
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
new file mode 100644
index 000000000000..3313e2daeab0
--- /dev/null
+++ b/drivers/input/serio/serio.c
@@ -0,0 +1,859 @@
1/*
2 * The Serio abstraction module
3 *
4 * Copyright (c) 1999-2004 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 * Copyright (c) 2003 Daniele Bellucci
7 */
8
9/*
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.
14 *
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.
19 *
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
23 *
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
27 */
28
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/completion.h>
35#include <linux/sched.h>
36#include <linux/smp_lock.h>
37#include <linux/slab.h>
38
39MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40MODULE_DESCRIPTION("Serio abstraction core");
41MODULE_LICENSE("GPL");
42
43EXPORT_SYMBOL(serio_interrupt);
44EXPORT_SYMBOL(__serio_register_port);
45EXPORT_SYMBOL(serio_unregister_port);
46EXPORT_SYMBOL(__serio_unregister_port_delayed);
47EXPORT_SYMBOL(__serio_register_driver);
48EXPORT_SYMBOL(serio_unregister_driver);
49EXPORT_SYMBOL(serio_open);
50EXPORT_SYMBOL(serio_close);
51EXPORT_SYMBOL(serio_rescan);
52EXPORT_SYMBOL(serio_reconnect);
53
54/*
55 * serio_sem protects entire serio subsystem and is taken every time
56 * serio port or driver registrered or unregistered.
57 */
58static DECLARE_MUTEX(serio_sem);
59
60static LIST_HEAD(serio_list);
61
62static struct bus_type serio_bus = {
63 .name = "serio",
64};
65
66static void serio_add_port(struct serio *serio);
67static void serio_destroy_port(struct serio *serio);
68static void serio_reconnect_port(struct serio *serio);
69static void serio_disconnect_port(struct serio *serio);
70
71static int serio_match_port(const struct serio_device_id *ids, struct serio *serio)
72{
73 while (ids->type || ids->proto) {
74 if ((ids->type == SERIO_ANY || ids->type == serio->id.type) &&
75 (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) &&
76 (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) &&
77 (ids->id == SERIO_ANY || ids->id == serio->id.id))
78 return 1;
79 ids++;
80 }
81 return 0;
82}
83
84/*
85 * Basic serio -> driver core mappings
86 */
87
88static void serio_bind_driver(struct serio *serio, struct serio_driver *drv)
89{
90 down_write(&serio_bus.subsys.rwsem);
91
92 if (serio_match_port(drv->id_table, serio)) {
93 serio->dev.driver = &drv->driver;
94 if (drv->connect(serio, drv)) {
95 serio->dev.driver = NULL;
96 goto out;
97 }
98 device_bind_driver(&serio->dev);
99 }
100out:
101 up_write(&serio_bus.subsys.rwsem);
102}
103
104static void serio_release_driver(struct serio *serio)
105{
106 down_write(&serio_bus.subsys.rwsem);
107 device_release_driver(&serio->dev);
108 up_write(&serio_bus.subsys.rwsem);
109}
110
111static void serio_find_driver(struct serio *serio)
112{
113 down_write(&serio_bus.subsys.rwsem);
114 device_attach(&serio->dev);
115 up_write(&serio_bus.subsys.rwsem);
116}
117
118
119/*
120 * Serio event processing.
121 */
122
123enum serio_event_type {
124 SERIO_RESCAN,
125 SERIO_RECONNECT,
126 SERIO_REGISTER_PORT,
127 SERIO_UNREGISTER_PORT,
128 SERIO_REGISTER_DRIVER,
129};
130
131struct serio_event {
132 enum serio_event_type type;
133 void *object;
134 struct module *owner;
135 struct list_head node;
136};
137
138static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */
139static LIST_HEAD(serio_event_list);
140static DECLARE_WAIT_QUEUE_HEAD(serio_wait);
141static DECLARE_COMPLETION(serio_exited);
142static int serio_pid;
143
144static void serio_queue_event(void *object, struct module *owner,
145 enum serio_event_type event_type)
146{
147 unsigned long flags;
148 struct serio_event *event;
149
150 spin_lock_irqsave(&serio_event_lock, flags);
151
152 /*
153 * Scan event list for the other events for the same serio port,
154 * starting with the most recent one. If event is the same we
155 * do not need add new one. If event is of different type we
156 * need to add this event and should not look further because
157 * we need to preseve sequence of distinct events.
158 */
159 list_for_each_entry_reverse(event, &serio_event_list, node) {
160 if (event->object == object) {
161 if (event->type == event_type)
162 goto out;
163 break;
164 }
165 }
166
167 if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) {
168 if (!try_module_get(owner)) {
169 printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type);
170 goto out;
171 }
172
173 event->type = event_type;
174 event->object = object;
175 event->owner = owner;
176
177 list_add_tail(&event->node, &serio_event_list);
178 wake_up(&serio_wait);
179 } else {
180 printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type);
181 }
182out:
183 spin_unlock_irqrestore(&serio_event_lock, flags);
184}
185
186static void serio_free_event(struct serio_event *event)
187{
188 module_put(event->owner);
189 kfree(event);
190}
191
192static void serio_remove_duplicate_events(struct serio_event *event)
193{
194 struct list_head *node, *next;
195 struct serio_event *e;
196 unsigned long flags;
197
198 spin_lock_irqsave(&serio_event_lock, flags);
199
200 list_for_each_safe(node, next, &serio_event_list) {
201 e = list_entry(node, struct serio_event, node);
202 if (event->object == e->object) {
203 /*
204 * If this event is of different type we should not
205 * look further - we only suppress duplicate events
206 * that were sent back-to-back.
207 */
208 if (event->type != e->type)
209 break;
210
211 list_del_init(node);
212 serio_free_event(e);
213 }
214 }
215
216 spin_unlock_irqrestore(&serio_event_lock, flags);
217}
218
219
220static struct serio_event *serio_get_event(void)
221{
222 struct serio_event *event;
223 struct list_head *node;
224 unsigned long flags;
225
226 spin_lock_irqsave(&serio_event_lock, flags);
227
228 if (list_empty(&serio_event_list)) {
229 spin_unlock_irqrestore(&serio_event_lock, flags);
230 return NULL;
231 }
232
233 node = serio_event_list.next;
234 event = list_entry(node, struct serio_event, node);
235 list_del_init(node);
236
237 spin_unlock_irqrestore(&serio_event_lock, flags);
238
239 return event;
240}
241
242static void serio_handle_events(void)
243{
244 struct serio_event *event;
245 struct serio_driver *serio_drv;
246
247 down(&serio_sem);
248
249 while ((event = serio_get_event())) {
250
251 switch (event->type) {
252 case SERIO_REGISTER_PORT:
253 serio_add_port(event->object);
254 break;
255
256 case SERIO_UNREGISTER_PORT:
257 serio_disconnect_port(event->object);
258 serio_destroy_port(event->object);
259 break;
260
261 case SERIO_RECONNECT:
262 serio_reconnect_port(event->object);
263 break;
264
265 case SERIO_RESCAN:
266 serio_disconnect_port(event->object);
267 serio_find_driver(event->object);
268 break;
269
270 case SERIO_REGISTER_DRIVER:
271 serio_drv = event->object;
272 driver_register(&serio_drv->driver);
273 break;
274
275 default:
276 break;
277 }
278
279 serio_remove_duplicate_events(event);
280 serio_free_event(event);
281 }
282
283 up(&serio_sem);
284}
285
286/*
287 * Remove all events that have been submitted for a given serio port.
288 */
289static void serio_remove_pending_events(struct serio *serio)
290{
291 struct list_head *node, *next;
292 struct serio_event *event;
293 unsigned long flags;
294
295 spin_lock_irqsave(&serio_event_lock, flags);
296
297 list_for_each_safe(node, next, &serio_event_list) {
298 event = list_entry(node, struct serio_event, node);
299 if (event->object == serio) {
300 list_del_init(node);
301 serio_free_event(event);
302 }
303 }
304
305 spin_unlock_irqrestore(&serio_event_lock, flags);
306}
307
308/*
309 * Destroy child serio port (if any) that has not been fully registered yet.
310 *
311 * Note that we rely on the fact that port can have only one child and therefore
312 * only one child registration request can be pending. Additionally, children
313 * are registered by driver's connect() handler so there can't be a grandchild
314 * pending registration together with a child.
315 */
316static struct serio *serio_get_pending_child(struct serio *parent)
317{
318 struct serio_event *event;
319 struct serio *serio, *child = NULL;
320 unsigned long flags;
321
322 spin_lock_irqsave(&serio_event_lock, flags);
323
324 list_for_each_entry(event, &serio_event_list, node) {
325 if (event->type == SERIO_REGISTER_PORT) {
326 serio = event->object;
327 if (serio->parent == parent) {
328 child = serio;
329 break;
330 }
331 }
332 }
333
334 spin_unlock_irqrestore(&serio_event_lock, flags);
335 return child;
336}
337
338static int serio_thread(void *nothing)
339{
340 lock_kernel();
341 daemonize("kseriod");
342 allow_signal(SIGTERM);
343
344 do {
345 serio_handle_events();
346 wait_event_interruptible(serio_wait, !list_empty(&serio_event_list));
347 try_to_freeze(PF_FREEZE);
348 } while (!signal_pending(current));
349
350 printk(KERN_DEBUG "serio: kseriod exiting\n");
351
352 unlock_kernel();
353 complete_and_exit(&serio_exited, 0);
354}
355
356
357/*
358 * Serio port operations
359 */
360
361static ssize_t serio_show_description(struct device *dev, char *buf)
362{
363 struct serio *serio = to_serio_port(dev);
364 return sprintf(buf, "%s\n", serio->name);
365}
366
367static ssize_t serio_show_id_type(struct device *dev, char *buf)
368{
369 struct serio *serio = to_serio_port(dev);
370 return sprintf(buf, "%02x\n", serio->id.type);
371}
372
373static ssize_t serio_show_id_proto(struct device *dev, char *buf)
374{
375 struct serio *serio = to_serio_port(dev);
376 return sprintf(buf, "%02x\n", serio->id.proto);
377}
378
379static ssize_t serio_show_id_id(struct device *dev, char *buf)
380{
381 struct serio *serio = to_serio_port(dev);
382 return sprintf(buf, "%02x\n", serio->id.id);
383}
384
385static ssize_t serio_show_id_extra(struct device *dev, char *buf)
386{
387 struct serio *serio = to_serio_port(dev);
388 return sprintf(buf, "%02x\n", serio->id.extra);
389}
390
391static ssize_t serio_rebind_driver(struct device *dev, const char *buf, size_t count)
392{
393 struct serio *serio = to_serio_port(dev);
394 struct device_driver *drv;
395 int retval;
396
397 retval = down_interruptible(&serio_sem);
398 if (retval)
399 return retval;
400
401 retval = count;
402 if (!strncmp(buf, "none", count)) {
403 serio_disconnect_port(serio);
404 } else if (!strncmp(buf, "reconnect", count)) {
405 serio_reconnect_port(serio);
406 } else if (!strncmp(buf, "rescan", count)) {
407 serio_disconnect_port(serio);
408 serio_find_driver(serio);
409 } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
410 serio_disconnect_port(serio);
411 serio_bind_driver(serio, to_serio_driver(drv));
412 put_driver(drv);
413 } else {
414 retval = -EINVAL;
415 }
416
417 up(&serio_sem);
418
419 return retval;
420}
421
422static ssize_t serio_show_bind_mode(struct device *dev, char *buf)
423{
424 struct serio *serio = to_serio_port(dev);
425 return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
426}
427
428static ssize_t serio_set_bind_mode(struct device *dev, const char *buf, size_t count)
429{
430 struct serio *serio = to_serio_port(dev);
431 int retval;
432
433 retval = count;
434 if (!strncmp(buf, "manual", count)) {
435 serio->manual_bind = 1;
436 } else if (!strncmp(buf, "auto", count)) {
437 serio->manual_bind = 0;
438 } else {
439 retval = -EINVAL;
440 }
441
442 return retval;
443}
444
445static struct device_attribute serio_device_attrs[] = {
446 __ATTR(description, S_IRUGO, serio_show_description, NULL),
447 __ATTR(id_type, S_IRUGO, serio_show_id_type, NULL),
448 __ATTR(id_proto, S_IRUGO, serio_show_id_proto, NULL),
449 __ATTR(id_id, S_IRUGO, serio_show_id_id, NULL),
450 __ATTR(id_extra, S_IRUGO, serio_show_id_extra, NULL),
451 __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver),
452 __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
453 __ATTR_NULL
454};
455
456
457static void serio_release_port(struct device *dev)
458{
459 struct serio *serio = to_serio_port(dev);
460
461 kfree(serio);
462 module_put(THIS_MODULE);
463}
464
465/*
466 * Prepare serio port for registration.
467 */
468static void serio_init_port(struct serio *serio)
469{
470 static atomic_t serio_no = ATOMIC_INIT(0);
471
472 __module_get(THIS_MODULE);
473
474 spin_lock_init(&serio->lock);
475 init_MUTEX(&serio->drv_sem);
476 device_initialize(&serio->dev);
477 snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id),
478 "serio%ld", (long)atomic_inc_return(&serio_no) - 1);
479 serio->dev.bus = &serio_bus;
480 serio->dev.release = serio_release_port;
481 if (serio->parent)
482 serio->dev.parent = &serio->parent->dev;
483}
484
485/*
486 * Complete serio port registration.
487 * Driver core will attempt to find appropriate driver for the port.
488 */
489static void serio_add_port(struct serio *serio)
490{
491 if (serio->parent) {
492 serio_pause_rx(serio->parent);
493 serio->parent->child = serio;
494 serio_continue_rx(serio->parent);
495 }
496
497 list_add_tail(&serio->node, &serio_list);
498 if (serio->start)
499 serio->start(serio);
500 device_add(&serio->dev);
501 serio->registered = 1;
502}
503
504/*
505 * serio_destroy_port() completes deregistration process and removes
506 * port from the system
507 */
508static void serio_destroy_port(struct serio *serio)
509{
510 struct serio *child;
511
512 child = serio_get_pending_child(serio);
513 if (child) {
514 serio_remove_pending_events(child);
515 put_device(&child->dev);
516 }
517
518 if (serio->stop)
519 serio->stop(serio);
520
521 if (serio->parent) {
522 serio_pause_rx(serio->parent);
523 serio->parent->child = NULL;
524 serio_continue_rx(serio->parent);
525 serio->parent = NULL;
526 }
527
528 if (serio->registered) {
529 device_del(&serio->dev);
530 list_del_init(&serio->node);
531 serio->registered = 0;
532 }
533
534 serio_remove_pending_events(serio);
535 put_device(&serio->dev);
536}
537
538/*
539 * Reconnect serio port and all its children (re-initialize attached devices)
540 */
541static void serio_reconnect_port(struct serio *serio)
542{
543 do {
544 if (!serio->drv || !serio->drv->reconnect || serio->drv->reconnect(serio)) {
545 serio_disconnect_port(serio);
546 serio_find_driver(serio);
547 /* Ok, old children are now gone, we are done */
548 break;
549 }
550 serio = serio->child;
551 } while (serio);
552}
553
554/*
555 * serio_disconnect_port() unbinds a port from its driver. As a side effect
556 * all child ports are unbound and destroyed.
557 */
558static void serio_disconnect_port(struct serio *serio)
559{
560 struct serio *s, *parent;
561
562 if (serio->child) {
563 /*
564 * Children ports should be disconnected and destroyed
565 * first, staring with the leaf one, since we don't want
566 * to do recursion
567 */
568 for (s = serio; s->child; s = s->child)
569 /* empty */;
570
571 do {
572 parent = s->parent;
573
574 serio_release_driver(s);
575 serio_destroy_port(s);
576 } while ((s = parent) != serio);
577 }
578
579 /*
580 * Ok, no children left, now disconnect this port
581 */
582 serio_release_driver(serio);
583}
584
585void serio_rescan(struct serio *serio)
586{
587 serio_queue_event(serio, NULL, SERIO_RESCAN);
588}
589
590void serio_reconnect(struct serio *serio)
591{
592 serio_queue_event(serio, NULL, SERIO_RECONNECT);
593}
594
595/*
596 * Submits register request to kseriod for subsequent execution.
597 * Note that port registration is always asynchronous.
598 */
599void __serio_register_port(struct serio *serio, struct module *owner)
600{
601 serio_init_port(serio);
602 serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
603}
604
605/*
606 * Synchronously unregisters serio port.
607 */
608void serio_unregister_port(struct serio *serio)
609{
610 down(&serio_sem);
611 serio_disconnect_port(serio);
612 serio_destroy_port(serio);
613 up(&serio_sem);
614}
615
616/*
617 * Submits register request to kseriod for subsequent execution.
618 * Can be used when it is not obvious whether the serio_sem is
619 * taken or not and when delayed execution is feasible.
620 */
621void __serio_unregister_port_delayed(struct serio *serio, struct module *owner)
622{
623 serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT);
624}
625
626
627/*
628 * Serio driver operations
629 */
630
631static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf)
632{
633 struct serio_driver *driver = to_serio_driver(drv);
634 return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
635}
636
637static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf)
638{
639 struct serio_driver *serio_drv = to_serio_driver(drv);
640 return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto");
641}
642
643static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count)
644{
645 struct serio_driver *serio_drv = to_serio_driver(drv);
646 int retval;
647
648 retval = count;
649 if (!strncmp(buf, "manual", count)) {
650 serio_drv->manual_bind = 1;
651 } else if (!strncmp(buf, "auto", count)) {
652 serio_drv->manual_bind = 0;
653 } else {
654 retval = -EINVAL;
655 }
656
657 return retval;
658}
659
660
661static struct driver_attribute serio_driver_attrs[] = {
662 __ATTR(description, S_IRUGO, serio_driver_show_description, NULL),
663 __ATTR(bind_mode, S_IWUSR | S_IRUGO,
664 serio_driver_show_bind_mode, serio_driver_set_bind_mode),
665 __ATTR_NULL
666};
667
668static int serio_driver_probe(struct device *dev)
669{
670 struct serio *serio = to_serio_port(dev);
671 struct serio_driver *drv = to_serio_driver(dev->driver);
672
673 return drv->connect(serio, drv);
674}
675
676static int serio_driver_remove(struct device *dev)
677{
678 struct serio *serio = to_serio_port(dev);
679 struct serio_driver *drv = to_serio_driver(dev->driver);
680
681 drv->disconnect(serio);
682 return 0;
683}
684
685void __serio_register_driver(struct serio_driver *drv, struct module *owner)
686{
687 drv->driver.bus = &serio_bus;
688 drv->driver.probe = serio_driver_probe;
689 drv->driver.remove = serio_driver_remove;
690
691 serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER);
692}
693
694void serio_unregister_driver(struct serio_driver *drv)
695{
696 struct serio *serio;
697
698 down(&serio_sem);
699 drv->manual_bind = 1; /* so serio_find_driver ignores it */
700
701start_over:
702 list_for_each_entry(serio, &serio_list, node) {
703 if (serio->drv == drv) {
704 serio_disconnect_port(serio);
705 serio_find_driver(serio);
706 /* we could've deleted some ports, restart */
707 goto start_over;
708 }
709 }
710
711 driver_unregister(&drv->driver);
712 up(&serio_sem);
713}
714
715static void serio_set_drv(struct serio *serio, struct serio_driver *drv)
716{
717 down(&serio->drv_sem);
718 serio_pause_rx(serio);
719 serio->drv = drv;
720 serio_continue_rx(serio);
721 up(&serio->drv_sem);
722}
723
724static int serio_bus_match(struct device *dev, struct device_driver *drv)
725{
726 struct serio *serio = to_serio_port(dev);
727 struct serio_driver *serio_drv = to_serio_driver(drv);
728
729 if (serio->manual_bind || serio_drv->manual_bind)
730 return 0;
731
732 return serio_match_port(serio_drv->id_table, serio);
733}
734
735#ifdef CONFIG_HOTPLUG
736
737#define PUT_ENVP(fmt, val) \
738do { \
739 envp[i++] = buffer; \
740 length += snprintf(buffer, buffer_size - length, fmt, val); \
741 if (buffer_size - length <= 0 || i >= num_envp) \
742 return -ENOMEM; \
743 length++; \
744 buffer += length; \
745} while (0)
746static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
747{
748 struct serio *serio;
749 int i = 0;
750 int length = 0;
751
752 if (!dev)
753 return -ENODEV;
754
755 serio = to_serio_port(dev);
756
757 PUT_ENVP("SERIO_TYPE=%02x", serio->id.type);
758 PUT_ENVP("SERIO_PROTO=%02x", serio->id.proto);
759 PUT_ENVP("SERIO_ID=%02x", serio->id.id);
760 PUT_ENVP("SERIO_EXTRA=%02x", serio->id.extra);
761
762 envp[i] = NULL;
763
764 return 0;
765}
766#undef PUT_ENVP
767
768#else
769
770static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
771{
772 return -ENODEV;
773}
774
775#endif /* CONFIG_HOTPLUG */
776
777static int serio_resume(struct device *dev)
778{
779 struct serio *serio = to_serio_port(dev);
780
781 if (!serio->drv || !serio->drv->reconnect || serio->drv->reconnect(serio)) {
782 serio_disconnect_port(serio);
783 /*
784 * Driver re-probing can take a while, so better let kseriod
785 * deal with it.
786 */
787 serio_rescan(serio);
788 }
789
790 return 0;
791}
792
793/* called from serio_driver->connect/disconnect methods under serio_sem */
794int serio_open(struct serio *serio, struct serio_driver *drv)
795{
796 serio_set_drv(serio, drv);
797
798 if (serio->open && serio->open(serio)) {
799 serio_set_drv(serio, NULL);
800 return -1;
801 }
802 return 0;
803}
804
805/* called from serio_driver->connect/disconnect methods under serio_sem */
806void serio_close(struct serio *serio)
807{
808 if (serio->close)
809 serio->close(serio);
810
811 serio_set_drv(serio, NULL);
812}
813
814irqreturn_t serio_interrupt(struct serio *serio,
815 unsigned char data, unsigned int dfl, struct pt_regs *regs)
816{
817 unsigned long flags;
818 irqreturn_t ret = IRQ_NONE;
819
820 spin_lock_irqsave(&serio->lock, flags);
821
822 if (likely(serio->drv)) {
823 ret = serio->drv->interrupt(serio, data, dfl, regs);
824 } else if (!dfl && serio->registered) {
825 serio_rescan(serio);
826 ret = IRQ_HANDLED;
827 }
828
829 spin_unlock_irqrestore(&serio->lock, flags);
830
831 return ret;
832}
833
834static int __init serio_init(void)
835{
836 if (!(serio_pid = kernel_thread(serio_thread, NULL, CLONE_KERNEL))) {
837 printk(KERN_ERR "serio: Failed to start kseriod\n");
838 return -1;
839 }
840
841 serio_bus.dev_attrs = serio_device_attrs;
842 serio_bus.drv_attrs = serio_driver_attrs;
843 serio_bus.match = serio_bus_match;
844 serio_bus.hotplug = serio_hotplug;
845 serio_bus.resume = serio_resume;
846 bus_register(&serio_bus);
847
848 return 0;
849}
850
851static void __exit serio_exit(void)
852{
853 bus_unregister(&serio_bus);
854 kill_proc(serio_pid, SIGTERM, 1);
855 wait_for_completion(&serio_exited);
856}
857
858module_init(serio_init);
859module_exit(serio_exit);