dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / input / serio / serio.c
blob8f828975ab10b03746e700dd26dce1cb03d2c17e
1 /*
2 * The Serio abstraction module
4 * Copyright (c) 1999-2004 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 * Copyright (c) 2003 Daniele Bellucci
7 */
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.
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 void serio_add_port(struct serio *serio);
53 static int serio_reconnect_port(struct serio *serio);
54 static void serio_disconnect_port(struct serio *serio);
55 static void serio_reconnect_subtree(struct serio *serio);
56 static void serio_attach_driver(struct serio_driver *drv);
58 static int serio_connect_driver(struct serio *serio, struct serio_driver *drv)
60 int retval;
62 mutex_lock(&serio->drv_mutex);
63 retval = drv->connect(serio, drv);
64 mutex_unlock(&serio->drv_mutex);
66 return retval;
69 static int serio_reconnect_driver(struct serio *serio)
71 int retval = -1;
73 mutex_lock(&serio->drv_mutex);
74 if (serio->drv && serio->drv->reconnect)
75 retval = serio->drv->reconnect(serio);
76 mutex_unlock(&serio->drv_mutex);
78 return retval;
81 static void serio_disconnect_driver(struct serio *serio)
83 mutex_lock(&serio->drv_mutex);
84 if (serio->drv)
85 serio->drv->disconnect(serio);
86 mutex_unlock(&serio->drv_mutex);
89 static int serio_match_port(const struct serio_device_id *ids, struct serio *serio)
91 while (ids->type || ids->proto) {
92 if ((ids->type == SERIO_ANY || ids->type == serio->id.type) &&
93 (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) &&
94 (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) &&
95 (ids->id == SERIO_ANY || ids->id == serio->id.id))
96 return 1;
97 ids++;
99 return 0;
103 * Basic serio -> driver core mappings
106 static int serio_bind_driver(struct serio *serio, struct serio_driver *drv)
108 int error;
110 if (serio_match_port(drv->id_table, serio)) {
112 serio->dev.driver = &drv->driver;
113 if (serio_connect_driver(serio, drv)) {
114 serio->dev.driver = NULL;
115 return -ENODEV;
118 error = device_bind_driver(&serio->dev);
119 if (error) {
120 dev_warn(&serio->dev,
121 "device_bind_driver() failed for %s (%s) and %s, error: %d\n",
122 serio->phys, serio->name,
123 drv->description, error);
124 serio_disconnect_driver(serio);
125 serio->dev.driver = NULL;
126 return error;
129 return 0;
132 static void serio_find_driver(struct serio *serio)
134 int error;
136 error = device_attach(&serio->dev);
137 if (error < 0)
138 dev_warn(&serio->dev,
139 "device_attach() failed for %s (%s), error: %d\n",
140 serio->phys, serio->name, error);
145 * Serio event processing.
148 enum serio_event_type {
149 SERIO_RESCAN_PORT,
150 SERIO_RECONNECT_PORT,
151 SERIO_RECONNECT_SUBTREE,
152 SERIO_REGISTER_PORT,
153 SERIO_ATTACH_DRIVER,
156 struct serio_event {
157 enum serio_event_type type;
158 void *object;
159 struct module *owner;
160 struct list_head node;
163 static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */
164 static LIST_HEAD(serio_event_list);
166 static struct serio_event *serio_get_event(void)
168 struct serio_event *event = NULL;
169 unsigned long flags;
171 spin_lock_irqsave(&serio_event_lock, flags);
173 if (!list_empty(&serio_event_list)) {
174 event = list_first_entry(&serio_event_list,
175 struct serio_event, node);
176 list_del_init(&event->node);
179 spin_unlock_irqrestore(&serio_event_lock, flags);
180 return event;
183 static void serio_free_event(struct serio_event *event)
185 module_put(event->owner);
186 kfree(event);
189 static void serio_remove_duplicate_events(void *object,
190 enum serio_event_type type)
192 struct serio_event *e, *next;
193 unsigned long flags;
195 spin_lock_irqsave(&serio_event_lock, flags);
197 list_for_each_entry_safe(e, next, &serio_event_list, node) {
198 if (object == e->object) {
200 * If this event is of different type we should not
201 * look further - we only suppress duplicate events
202 * that were sent back-to-back.
204 if (type != e->type)
205 break;
207 list_del_init(&e->node);
208 serio_free_event(e);
212 spin_unlock_irqrestore(&serio_event_lock, flags);
215 static void serio_handle_event(struct work_struct *work)
217 struct serio_event *event;
219 mutex_lock(&serio_mutex);
221 while ((event = serio_get_event())) {
223 switch (event->type) {
225 case SERIO_REGISTER_PORT:
226 serio_add_port(event->object);
227 break;
229 case SERIO_RECONNECT_PORT:
230 serio_reconnect_port(event->object);
231 break;
233 case SERIO_RESCAN_PORT:
234 serio_disconnect_port(event->object);
235 serio_find_driver(event->object);
236 break;
238 case SERIO_RECONNECT_SUBTREE:
239 serio_reconnect_subtree(event->object);
240 break;
242 case SERIO_ATTACH_DRIVER:
243 serio_attach_driver(event->object);
244 break;
247 serio_remove_duplicate_events(event->object, event->type);
248 serio_free_event(event);
251 mutex_unlock(&serio_mutex);
254 static DECLARE_WORK(serio_event_work, serio_handle_event);
256 static int serio_queue_event(void *object, struct module *owner,
257 enum serio_event_type event_type)
259 unsigned long flags;
260 struct serio_event *event;
261 int retval = 0;
263 spin_lock_irqsave(&serio_event_lock, flags);
266 * Scan event list for the other events for the same serio port,
267 * starting with the most recent one. If event is the same we
268 * do not need add new one. If event is of different type we
269 * need to add this event and should not look further because
270 * we need to preseve sequence of distinct events.
272 list_for_each_entry_reverse(event, &serio_event_list, node) {
273 if (event->object == object) {
274 if (event->type == event_type)
275 goto out;
276 break;
280 event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC);
281 if (!event) {
282 pr_err("Not enough memory to queue event %d\n", event_type);
283 retval = -ENOMEM;
284 goto out;
287 if (!try_module_get(owner)) {
288 pr_warning("Can't get module reference, dropping event %d\n",
289 event_type);
290 kfree(event);
291 retval = -EINVAL;
292 goto out;
295 event->type = event_type;
296 event->object = object;
297 event->owner = owner;
299 list_add_tail(&event->node, &serio_event_list);
300 queue_work(system_long_wq, &serio_event_work);
302 out:
303 spin_unlock_irqrestore(&serio_event_lock, flags);
304 return retval;
308 * Remove all events that have been submitted for a given
309 * object, be it serio port or driver.
311 static void serio_remove_pending_events(void *object)
313 struct serio_event *event, *next;
314 unsigned long flags;
316 spin_lock_irqsave(&serio_event_lock, flags);
318 list_for_each_entry_safe(event, next, &serio_event_list, node) {
319 if (event->object == object) {
320 list_del_init(&event->node);
321 serio_free_event(event);
325 spin_unlock_irqrestore(&serio_event_lock, flags);
329 * Locate child serio port (if any) that has not been fully registered yet.
331 * Children are registered by driver's connect() handler so there can't be a
332 * grandchild pending registration together with a child.
334 static struct serio *serio_get_pending_child(struct serio *parent)
336 struct serio_event *event;
337 struct serio *serio, *child = NULL;
338 unsigned long flags;
340 spin_lock_irqsave(&serio_event_lock, flags);
342 list_for_each_entry(event, &serio_event_list, node) {
343 if (event->type == SERIO_REGISTER_PORT) {
344 serio = event->object;
345 if (serio->parent == parent) {
346 child = serio;
347 break;
352 spin_unlock_irqrestore(&serio_event_lock, flags);
353 return child;
357 * Serio port operations
360 static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf)
362 struct serio *serio = to_serio_port(dev);
363 return sprintf(buf, "%s\n", serio->name);
366 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
368 struct serio *serio = to_serio_port(dev);
370 return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n",
371 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
374 static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
376 struct serio *serio = to_serio_port(dev);
377 return sprintf(buf, "%02x\n", serio->id.type);
380 static ssize_t proto_show(struct device *dev, struct device_attribute *attr, char *buf)
382 struct serio *serio = to_serio_port(dev);
383 return sprintf(buf, "%02x\n", serio->id.proto);
386 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
388 struct serio *serio = to_serio_port(dev);
389 return sprintf(buf, "%02x\n", serio->id.id);
392 static ssize_t extra_show(struct device *dev, struct device_attribute *attr, char *buf)
394 struct serio *serio = to_serio_port(dev);
395 return sprintf(buf, "%02x\n", serio->id.extra);
398 static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
400 struct serio *serio = to_serio_port(dev);
401 struct device_driver *drv;
402 int error;
404 error = mutex_lock_interruptible(&serio_mutex);
405 if (error)
406 return error;
408 if (!strncmp(buf, "none", count)) {
409 serio_disconnect_port(serio);
410 } else if (!strncmp(buf, "reconnect", count)) {
411 serio_reconnect_subtree(serio);
412 } else if (!strncmp(buf, "rescan", count)) {
413 serio_disconnect_port(serio);
414 serio_find_driver(serio);
415 serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
416 } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
417 serio_disconnect_port(serio);
418 error = serio_bind_driver(serio, to_serio_driver(drv));
419 serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
420 } else {
421 error = -EINVAL;
424 mutex_unlock(&serio_mutex);
426 return error ? error : count;
429 static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
431 struct serio *serio = to_serio_port(dev);
432 return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
435 static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
437 struct serio *serio = to_serio_port(dev);
438 int retval;
440 retval = count;
441 if (!strncmp(buf, "manual", count)) {
442 serio->manual_bind = true;
443 } else if (!strncmp(buf, "auto", count)) {
444 serio->manual_bind = false;
445 } else {
446 retval = -EINVAL;
449 return retval;
452 static ssize_t firmware_id_show(struct device *dev, struct device_attribute *attr, char *buf)
454 struct serio *serio = to_serio_port(dev);
456 return sprintf(buf, "%s\n", serio->firmware_id);
459 static DEVICE_ATTR_RO(type);
460 static DEVICE_ATTR_RO(proto);
461 static DEVICE_ATTR_RO(id);
462 static DEVICE_ATTR_RO(extra);
464 static struct attribute *serio_device_id_attrs[] = {
465 &dev_attr_type.attr,
466 &dev_attr_proto.attr,
467 &dev_attr_id.attr,
468 &dev_attr_extra.attr,
469 NULL
472 static struct attribute_group serio_id_attr_group = {
473 .name = "id",
474 .attrs = serio_device_id_attrs,
477 static DEVICE_ATTR_RO(modalias);
478 static DEVICE_ATTR_WO(drvctl);
479 static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL);
480 static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode);
481 static DEVICE_ATTR_RO(firmware_id);
483 static struct attribute *serio_device_attrs[] = {
484 &dev_attr_modalias.attr,
485 &dev_attr_description.attr,
486 &dev_attr_drvctl.attr,
487 &dev_attr_bind_mode.attr,
488 &dev_attr_firmware_id.attr,
489 NULL
492 static struct attribute_group serio_device_attr_group = {
493 .attrs = serio_device_attrs,
496 static const struct attribute_group *serio_device_attr_groups[] = {
497 &serio_id_attr_group,
498 &serio_device_attr_group,
499 NULL
502 static void serio_release_port(struct device *dev)
504 struct serio *serio = to_serio_port(dev);
506 kfree(serio);
507 module_put(THIS_MODULE);
511 * Prepare serio port for registration.
513 static void serio_init_port(struct serio *serio)
515 static atomic_t serio_no = ATOMIC_INIT(-1);
517 __module_get(THIS_MODULE);
519 INIT_LIST_HEAD(&serio->node);
520 INIT_LIST_HEAD(&serio->child_node);
521 INIT_LIST_HEAD(&serio->children);
522 spin_lock_init(&serio->lock);
523 mutex_init(&serio->drv_mutex);
524 device_initialize(&serio->dev);
525 dev_set_name(&serio->dev, "serio%lu",
526 (unsigned long)atomic_inc_return(&serio_no));
527 serio->dev.bus = &serio_bus;
528 serio->dev.release = serio_release_port;
529 serio->dev.groups = serio_device_attr_groups;
530 if (serio->parent) {
531 serio->dev.parent = &serio->parent->dev;
532 serio->depth = serio->parent->depth + 1;
533 } else
534 serio->depth = 0;
535 lockdep_set_subclass(&serio->lock, serio->depth);
539 * Complete serio port registration.
540 * Driver core will attempt to find appropriate driver for the port.
542 static void serio_add_port(struct serio *serio)
544 struct serio *parent = serio->parent;
545 int error;
547 if (parent) {
548 serio_pause_rx(parent);
549 list_add_tail(&serio->child_node, &parent->children);
550 serio_continue_rx(parent);
553 list_add_tail(&serio->node, &serio_list);
555 if (serio->start)
556 serio->start(serio);
558 error = device_add(&serio->dev);
559 if (error)
560 dev_err(&serio->dev,
561 "device_add() failed for %s (%s), error: %d\n",
562 serio->phys, serio->name, error);
566 * serio_destroy_port() completes unregistration process and removes
567 * port from the system
569 static void serio_destroy_port(struct serio *serio)
571 struct serio *child;
573 while ((child = serio_get_pending_child(serio)) != NULL) {
574 serio_remove_pending_events(child);
575 put_device(&child->dev);
578 if (serio->stop)
579 serio->stop(serio);
581 if (serio->parent) {
582 serio_pause_rx(serio->parent);
583 list_del_init(&serio->child_node);
584 serio_continue_rx(serio->parent);
585 serio->parent = NULL;
588 if (device_is_registered(&serio->dev))
589 device_del(&serio->dev);
591 list_del_init(&serio->node);
592 serio_remove_pending_events(serio);
593 put_device(&serio->dev);
597 * Reconnect serio port (re-initialize attached device).
598 * If reconnect fails (old device is no longer attached or
599 * there was no device to begin with) we do full rescan in
600 * hope of finding a driver for the port.
602 static int serio_reconnect_port(struct serio *serio)
604 int error = serio_reconnect_driver(serio);
606 if (error) {
607 serio_disconnect_port(serio);
608 serio_find_driver(serio);
611 return error;
615 * Reconnect serio port and all its children (re-initialize attached
616 * devices).
618 static void serio_reconnect_subtree(struct serio *root)
620 struct serio *s = root;
621 int error;
623 do {
624 error = serio_reconnect_port(s);
625 if (!error) {
627 * Reconnect was successful, move on to do the
628 * first child.
630 if (!list_empty(&s->children)) {
631 s = list_first_entry(&s->children,
632 struct serio, child_node);
633 continue;
638 * Either it was a leaf node or reconnect failed and it
639 * became a leaf node. Continue reconnecting starting with
640 * the next sibling of the parent node.
642 while (s != root) {
643 struct serio *parent = s->parent;
645 if (!list_is_last(&s->child_node, &parent->children)) {
646 s = list_entry(s->child_node.next,
647 struct serio, child_node);
648 break;
651 s = parent;
653 } while (s != root);
657 * serio_disconnect_port() unbinds a port from its driver. As a side effect
658 * all children ports are unbound and destroyed.
660 static void serio_disconnect_port(struct serio *serio)
662 struct serio *s = serio;
665 * Children ports should be disconnected and destroyed
666 * first; we travel the tree in depth-first order.
668 while (!list_empty(&serio->children)) {
670 /* Locate a leaf */
671 while (!list_empty(&s->children))
672 s = list_first_entry(&s->children,
673 struct serio, child_node);
676 * Prune this leaf node unless it is the one we
677 * started with.
679 if (s != serio) {
680 struct serio *parent = s->parent;
682 device_release_driver(&s->dev);
683 serio_destroy_port(s);
685 s = parent;
690 * OK, no children left, now disconnect this port.
692 device_release_driver(&serio->dev);
695 void serio_rescan(struct serio *serio)
697 serio_queue_event(serio, NULL, SERIO_RESCAN_PORT);
699 EXPORT_SYMBOL(serio_rescan);
701 void serio_reconnect(struct serio *serio)
703 serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE);
705 EXPORT_SYMBOL(serio_reconnect);
708 * Submits register request to kseriod for subsequent execution.
709 * Note that port registration is always asynchronous.
711 void __serio_register_port(struct serio *serio, struct module *owner)
713 serio_init_port(serio);
714 serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
716 EXPORT_SYMBOL(__serio_register_port);
719 * Synchronously unregisters serio port.
721 void serio_unregister_port(struct serio *serio)
723 mutex_lock(&serio_mutex);
724 serio_disconnect_port(serio);
725 serio_destroy_port(serio);
726 mutex_unlock(&serio_mutex);
728 EXPORT_SYMBOL(serio_unregister_port);
731 * Safely unregisters children ports if they are present.
733 void serio_unregister_child_port(struct serio *serio)
735 struct serio *s, *next;
737 mutex_lock(&serio_mutex);
738 list_for_each_entry_safe(s, next, &serio->children, child_node) {
739 serio_disconnect_port(s);
740 serio_destroy_port(s);
742 mutex_unlock(&serio_mutex);
744 EXPORT_SYMBOL(serio_unregister_child_port);
748 * Serio driver operations
751 static ssize_t description_show(struct device_driver *drv, char *buf)
753 struct serio_driver *driver = to_serio_driver(drv);
754 return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
756 static DRIVER_ATTR_RO(description);
758 static ssize_t bind_mode_show(struct device_driver *drv, char *buf)
760 struct serio_driver *serio_drv = to_serio_driver(drv);
761 return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto");
764 static ssize_t bind_mode_store(struct device_driver *drv, const char *buf, size_t count)
766 struct serio_driver *serio_drv = to_serio_driver(drv);
767 int retval;
769 retval = count;
770 if (!strncmp(buf, "manual", count)) {
771 serio_drv->manual_bind = true;
772 } else if (!strncmp(buf, "auto", count)) {
773 serio_drv->manual_bind = false;
774 } else {
775 retval = -EINVAL;
778 return retval;
780 static DRIVER_ATTR_RW(bind_mode);
782 static struct attribute *serio_driver_attrs[] = {
783 &driver_attr_description.attr,
784 &driver_attr_bind_mode.attr,
785 NULL,
787 ATTRIBUTE_GROUPS(serio_driver);
789 static int serio_driver_probe(struct device *dev)
791 struct serio *serio = to_serio_port(dev);
792 struct serio_driver *drv = to_serio_driver(dev->driver);
794 return serio_connect_driver(serio, drv);
797 static int serio_driver_remove(struct device *dev)
799 struct serio *serio = to_serio_port(dev);
801 serio_disconnect_driver(serio);
802 return 0;
805 static void serio_cleanup(struct serio *serio)
807 mutex_lock(&serio->drv_mutex);
808 if (serio->drv && serio->drv->cleanup)
809 serio->drv->cleanup(serio);
810 mutex_unlock(&serio->drv_mutex);
813 static void serio_shutdown(struct device *dev)
815 struct serio *serio = to_serio_port(dev);
817 serio_cleanup(serio);
820 static void serio_attach_driver(struct serio_driver *drv)
822 int error;
824 error = driver_attach(&drv->driver);
825 if (error)
826 pr_warning("driver_attach() failed for %s with error %d\n",
827 drv->driver.name, error);
830 int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name)
832 bool manual_bind = drv->manual_bind;
833 int error;
835 drv->driver.bus = &serio_bus;
836 drv->driver.owner = owner;
837 drv->driver.mod_name = mod_name;
840 * Temporarily disable automatic binding because probing
841 * takes long time and we are better off doing it in kseriod
843 drv->manual_bind = true;
845 error = driver_register(&drv->driver);
846 if (error) {
847 pr_err("driver_register() failed for %s, error: %d\n",
848 drv->driver.name, error);
849 return error;
853 * Restore original bind mode and let kseriod bind the
854 * driver to free ports
856 if (!manual_bind) {
857 drv->manual_bind = false;
858 error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER);
859 if (error) {
860 driver_unregister(&drv->driver);
861 return error;
865 return 0;
867 EXPORT_SYMBOL(__serio_register_driver);
869 void serio_unregister_driver(struct serio_driver *drv)
871 struct serio *serio;
873 mutex_lock(&serio_mutex);
875 drv->manual_bind = true; /* so serio_find_driver ignores it */
876 serio_remove_pending_events(drv);
878 start_over:
879 list_for_each_entry(serio, &serio_list, node) {
880 if (serio->drv == drv) {
881 serio_disconnect_port(serio);
882 serio_find_driver(serio);
883 /* we could've deleted some ports, restart */
884 goto start_over;
888 driver_unregister(&drv->driver);
889 mutex_unlock(&serio_mutex);
891 EXPORT_SYMBOL(serio_unregister_driver);
893 static void serio_set_drv(struct serio *serio, struct serio_driver *drv)
895 serio_pause_rx(serio);
896 serio->drv = drv;
897 serio_continue_rx(serio);
900 static int serio_bus_match(struct device *dev, struct device_driver *drv)
902 struct serio *serio = to_serio_port(dev);
903 struct serio_driver *serio_drv = to_serio_driver(drv);
905 if (serio->manual_bind || serio_drv->manual_bind)
906 return 0;
908 return serio_match_port(serio_drv->id_table, serio);
911 #define SERIO_ADD_UEVENT_VAR(fmt, val...) \
912 do { \
913 int err = add_uevent_var(env, fmt, val); \
914 if (err) \
915 return err; \
916 } while (0)
918 static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
920 struct serio *serio;
922 if (!dev)
923 return -ENODEV;
925 serio = to_serio_port(dev);
927 SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type);
928 SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto);
929 SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id);
930 SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra);
932 SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X",
933 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
935 if (serio->firmware_id[0])
936 SERIO_ADD_UEVENT_VAR("SERIO_FIRMWARE_ID=%s",
937 serio->firmware_id);
939 return 0;
941 #undef SERIO_ADD_UEVENT_VAR
943 #ifdef CONFIG_PM
944 static int serio_suspend(struct device *dev)
946 struct serio *serio = to_serio_port(dev);
948 serio_cleanup(serio);
950 return 0;
953 static int serio_resume(struct device *dev)
955 struct serio *serio = to_serio_port(dev);
958 * Driver reconnect can take a while, so better let kseriod
959 * deal with it.
961 serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
963 return 0;
966 static const struct dev_pm_ops serio_pm_ops = {
967 .suspend = serio_suspend,
968 .resume = serio_resume,
969 .poweroff = serio_suspend,
970 .restore = serio_resume,
972 #endif /* CONFIG_PM */
974 /* called from serio_driver->connect/disconnect methods under serio_mutex */
975 int serio_open(struct serio *serio, struct serio_driver *drv)
977 serio_set_drv(serio, drv);
979 if (serio->open && serio->open(serio)) {
980 serio_set_drv(serio, NULL);
981 return -1;
983 return 0;
985 EXPORT_SYMBOL(serio_open);
987 /* called from serio_driver->connect/disconnect methods under serio_mutex */
988 void serio_close(struct serio *serio)
990 if (serio->close)
991 serio->close(serio);
993 serio_set_drv(serio, NULL);
995 EXPORT_SYMBOL(serio_close);
997 irqreturn_t serio_interrupt(struct serio *serio,
998 unsigned char data, unsigned int dfl)
1000 unsigned long flags;
1001 irqreturn_t ret = IRQ_NONE;
1003 spin_lock_irqsave(&serio->lock, flags);
1005 if (likely(serio->drv)) {
1006 ret = serio->drv->interrupt(serio, data, dfl);
1007 } else if (!dfl && device_is_registered(&serio->dev)) {
1008 serio_rescan(serio);
1009 ret = IRQ_HANDLED;
1012 spin_unlock_irqrestore(&serio->lock, flags);
1014 return ret;
1016 EXPORT_SYMBOL(serio_interrupt);
1018 struct bus_type serio_bus = {
1019 .name = "serio",
1020 .drv_groups = serio_driver_groups,
1021 .match = serio_bus_match,
1022 .uevent = serio_uevent,
1023 .probe = serio_driver_probe,
1024 .remove = serio_driver_remove,
1025 .shutdown = serio_shutdown,
1026 #ifdef CONFIG_PM
1027 .pm = &serio_pm_ops,
1028 #endif
1030 EXPORT_SYMBOL(serio_bus);
1032 static int __init serio_init(void)
1034 int error;
1036 error = bus_register(&serio_bus);
1037 if (error) {
1038 pr_err("Failed to register serio bus, error: %d\n", error);
1039 return error;
1042 return 0;
1045 static void __exit serio_exit(void)
1047 bus_unregister(&serio_bus);
1050 * There should not be any outstanding events but work may
1051 * still be scheduled so simply cancel it.
1053 cancel_work_sync(&serio_event_work);
1056 subsys_initcall(serio_init);
1057 module_exit(serio_exit);