Linux 3.4.102
[linux/fpc-iii.git] / drivers / input / serio / serio.c
blobd0f7533dbf88cbc0a632576f87fddc5e3f50ccfe
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 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)
62 int retval;
64 mutex_lock(&serio->drv_mutex);
65 retval = drv->connect(serio, drv);
66 mutex_unlock(&serio->drv_mutex);
68 return retval;
71 static int serio_reconnect_driver(struct serio *serio)
73 int retval = -1;
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);
80 return retval;
83 static void serio_disconnect_driver(struct serio *serio)
85 mutex_lock(&serio->drv_mutex);
86 if (serio->drv)
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))
98 return 1;
99 ids++;
101 return 0;
105 * Basic serio -> driver core mappings
108 static int serio_bind_driver(struct serio *serio, struct serio_driver *drv)
110 int error;
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;
117 return -ENODEV;
120 error = device_bind_driver(&serio->dev);
121 if (error) {
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;
128 return error;
131 return 0;
134 static void serio_find_driver(struct serio *serio)
136 int error;
138 error = device_attach(&serio->dev);
139 if (error < 0)
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 {
151 SERIO_RESCAN_PORT,
152 SERIO_RECONNECT_PORT,
153 SERIO_RECONNECT_SUBTREE,
154 SERIO_REGISTER_PORT,
155 SERIO_ATTACH_DRIVER,
158 struct serio_event {
159 enum serio_event_type type;
160 void *object;
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;
171 unsigned long flags;
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);
182 return event;
185 static void serio_free_event(struct serio_event *event)
187 module_put(event->owner);
188 kfree(event);
191 static void serio_remove_duplicate_events(void *object,
192 enum serio_event_type type)
194 struct serio_event *e, *next;
195 unsigned long flags;
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.
206 if (type != e->type)
207 break;
209 list_del_init(&e->node);
210 serio_free_event(e);
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);
229 break;
231 case SERIO_RECONNECT_PORT:
232 serio_reconnect_port(event->object);
233 break;
235 case SERIO_RESCAN_PORT:
236 serio_disconnect_port(event->object);
237 serio_find_driver(event->object);
238 break;
240 case SERIO_RECONNECT_SUBTREE:
241 serio_reconnect_subtree(event->object);
242 break;
244 case SERIO_ATTACH_DRIVER:
245 serio_attach_driver(event->object);
246 break;
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)
261 unsigned long flags;
262 struct serio_event *event;
263 int retval = 0;
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)
277 goto out;
278 break;
282 event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC);
283 if (!event) {
284 pr_err("Not enough memory to queue event %d\n", event_type);
285 retval = -ENOMEM;
286 goto out;
289 if (!try_module_get(owner)) {
290 pr_warning("Can't get module reference, dropping event %d\n",
291 event_type);
292 kfree(event);
293 retval = -EINVAL;
294 goto out;
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);
304 out:
305 spin_unlock_irqrestore(&serio_event_lock, flags);
306 return retval;
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;
316 unsigned long flags;
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;
340 unsigned long flags;
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) {
348 child = serio;
349 break;
354 spin_unlock_irqrestore(&serio_event_lock, flags);
355 return child;
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 serio_show_modalias(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 serio_show_id_type(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 serio_show_id_proto(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 serio_show_id_id(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 serio_show_id_extra(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 DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL);
401 static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL);
402 static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL);
403 static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL);
405 static struct attribute *serio_device_id_attrs[] = {
406 &dev_attr_type.attr,
407 &dev_attr_proto.attr,
408 &dev_attr_id.attr,
409 &dev_attr_extra.attr,
410 NULL
413 static struct attribute_group serio_id_attr_group = {
414 .name = "id",
415 .attrs = serio_device_id_attrs,
418 static const struct attribute_group *serio_device_attr_groups[] = {
419 &serio_id_attr_group,
420 NULL
423 static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
425 struct serio *serio = to_serio_port(dev);
426 struct device_driver *drv;
427 int error;
429 error = mutex_lock_interruptible(&serio_mutex);
430 if (error)
431 return error;
433 if (!strncmp(buf, "none", count)) {
434 serio_disconnect_port(serio);
435 } else if (!strncmp(buf, "reconnect", count)) {
436 serio_reconnect_subtree(serio);
437 } else if (!strncmp(buf, "rescan", count)) {
438 serio_disconnect_port(serio);
439 serio_find_driver(serio);
440 serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
441 } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
442 serio_disconnect_port(serio);
443 error = serio_bind_driver(serio, to_serio_driver(drv));
444 serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
445 } else {
446 error = -EINVAL;
449 mutex_unlock(&serio_mutex);
451 return error ? error : count;
454 static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
456 struct serio *serio = to_serio_port(dev);
457 return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
460 static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
462 struct serio *serio = to_serio_port(dev);
463 int retval;
465 retval = count;
466 if (!strncmp(buf, "manual", count)) {
467 serio->manual_bind = true;
468 } else if (!strncmp(buf, "auto", count)) {
469 serio->manual_bind = false;
470 } else {
471 retval = -EINVAL;
474 return retval;
477 static struct device_attribute serio_device_attrs[] = {
478 __ATTR(description, S_IRUGO, serio_show_description, NULL),
479 __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL),
480 __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver),
481 __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
482 __ATTR_NULL
486 static void serio_release_port(struct device *dev)
488 struct serio *serio = to_serio_port(dev);
490 kfree(serio);
491 module_put(THIS_MODULE);
495 * Prepare serio port for registration.
497 static void serio_init_port(struct serio *serio)
499 static atomic_t serio_no = ATOMIC_INIT(0);
501 __module_get(THIS_MODULE);
503 INIT_LIST_HEAD(&serio->node);
504 INIT_LIST_HEAD(&serio->child_node);
505 INIT_LIST_HEAD(&serio->children);
506 spin_lock_init(&serio->lock);
507 mutex_init(&serio->drv_mutex);
508 device_initialize(&serio->dev);
509 dev_set_name(&serio->dev, "serio%ld",
510 (long)atomic_inc_return(&serio_no) - 1);
511 serio->dev.bus = &serio_bus;
512 serio->dev.release = serio_release_port;
513 serio->dev.groups = serio_device_attr_groups;
514 if (serio->parent) {
515 serio->dev.parent = &serio->parent->dev;
516 serio->depth = serio->parent->depth + 1;
517 } else
518 serio->depth = 0;
519 lockdep_set_subclass(&serio->lock, serio->depth);
523 * Complete serio port registration.
524 * Driver core will attempt to find appropriate driver for the port.
526 static void serio_add_port(struct serio *serio)
528 struct serio *parent = serio->parent;
529 int error;
531 if (parent) {
532 serio_pause_rx(parent);
533 list_add_tail(&serio->child_node, &parent->children);
534 serio_continue_rx(parent);
537 list_add_tail(&serio->node, &serio_list);
539 if (serio->start)
540 serio->start(serio);
542 error = device_add(&serio->dev);
543 if (error)
544 dev_err(&serio->dev,
545 "device_add() failed for %s (%s), error: %d\n",
546 serio->phys, serio->name, error);
550 * serio_destroy_port() completes unregistration process and removes
551 * port from the system
553 static void serio_destroy_port(struct serio *serio)
555 struct serio *child;
557 while ((child = serio_get_pending_child(serio)) != NULL) {
558 serio_remove_pending_events(child);
559 put_device(&child->dev);
562 if (serio->stop)
563 serio->stop(serio);
565 if (serio->parent) {
566 serio_pause_rx(serio->parent);
567 list_del_init(&serio->child_node);
568 serio_continue_rx(serio->parent);
569 serio->parent = NULL;
572 if (device_is_registered(&serio->dev))
573 device_del(&serio->dev);
575 list_del_init(&serio->node);
576 serio_remove_pending_events(serio);
577 put_device(&serio->dev);
581 * Reconnect serio port (re-initialize attached device).
582 * If reconnect fails (old device is no longer attached or
583 * there was no device to begin with) we do full rescan in
584 * hope of finding a driver for the port.
586 static int serio_reconnect_port(struct serio *serio)
588 int error = serio_reconnect_driver(serio);
590 if (error) {
591 serio_disconnect_port(serio);
592 serio_find_driver(serio);
595 return error;
599 * Reconnect serio port and all its children (re-initialize attached
600 * devices).
602 static void serio_reconnect_subtree(struct serio *root)
604 struct serio *s = root;
605 int error;
607 do {
608 error = serio_reconnect_port(s);
609 if (!error) {
611 * Reconnect was successful, move on to do the
612 * first child.
614 if (!list_empty(&s->children)) {
615 s = list_first_entry(&s->children,
616 struct serio, child_node);
617 continue;
622 * Either it was a leaf node or reconnect failed and it
623 * became a leaf node. Continue reconnecting starting with
624 * the next sibling of the parent node.
626 while (s != root) {
627 struct serio *parent = s->parent;
629 if (!list_is_last(&s->child_node, &parent->children)) {
630 s = list_entry(s->child_node.next,
631 struct serio, child_node);
632 break;
635 s = parent;
637 } while (s != root);
641 * serio_disconnect_port() unbinds a port from its driver. As a side effect
642 * all children ports are unbound and destroyed.
644 static void serio_disconnect_port(struct serio *serio)
646 struct serio *s = serio;
649 * Children ports should be disconnected and destroyed
650 * first; we travel the tree in depth-first order.
652 while (!list_empty(&serio->children)) {
654 /* Locate a leaf */
655 while (!list_empty(&s->children))
656 s = list_first_entry(&s->children,
657 struct serio, child_node);
660 * Prune this leaf node unless it is the one we
661 * started with.
663 if (s != serio) {
664 struct serio *parent = s->parent;
666 device_release_driver(&s->dev);
667 serio_destroy_port(s);
669 s = parent;
674 * OK, no children left, now disconnect this port.
676 device_release_driver(&serio->dev);
679 void serio_rescan(struct serio *serio)
681 serio_queue_event(serio, NULL, SERIO_RESCAN_PORT);
683 EXPORT_SYMBOL(serio_rescan);
685 void serio_reconnect(struct serio *serio)
687 serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE);
689 EXPORT_SYMBOL(serio_reconnect);
692 * Submits register request to kseriod for subsequent execution.
693 * Note that port registration is always asynchronous.
695 void __serio_register_port(struct serio *serio, struct module *owner)
697 serio_init_port(serio);
698 serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
700 EXPORT_SYMBOL(__serio_register_port);
703 * Synchronously unregisters serio port.
705 void serio_unregister_port(struct serio *serio)
707 mutex_lock(&serio_mutex);
708 serio_disconnect_port(serio);
709 serio_destroy_port(serio);
710 mutex_unlock(&serio_mutex);
712 EXPORT_SYMBOL(serio_unregister_port);
715 * Safely unregisters children ports if they are present.
717 void serio_unregister_child_port(struct serio *serio)
719 struct serio *s, *next;
721 mutex_lock(&serio_mutex);
722 list_for_each_entry_safe(s, next, &serio->children, child_node) {
723 serio_disconnect_port(s);
724 serio_destroy_port(s);
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);
750 int retval;
752 retval = count;
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;
757 } else {
758 retval = -EINVAL;
761 return retval;
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),
769 __ATTR_NULL
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);
785 return 0;
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)
805 int error;
807 error = driver_attach(&drv->driver);
808 if (error)
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;
816 int error;
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);
829 if (error) {
830 pr_err("driver_register() failed for %s, error: %d\n",
831 drv->driver.name, error);
832 return error;
836 * Restore original bind mode and let kseriod bind the
837 * driver to free ports
839 if (!manual_bind) {
840 drv->manual_bind = false;
841 error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER);
842 if (error) {
843 driver_unregister(&drv->driver);
844 return error;
848 return 0;
850 EXPORT_SYMBOL(__serio_register_driver);
852 void serio_unregister_driver(struct serio_driver *drv)
854 struct serio *serio;
856 mutex_lock(&serio_mutex);
858 drv->manual_bind = true; /* so serio_find_driver ignores it */
859 serio_remove_pending_events(drv);
861 start_over:
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 */
867 goto start_over;
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);
879 serio->drv = drv;
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)
889 return 0;
891 return serio_match_port(serio_drv->id_table, serio);
894 #ifdef CONFIG_HOTPLUG
896 #define SERIO_ADD_UEVENT_VAR(fmt, val...) \
897 do { \
898 int err = add_uevent_var(env, fmt, val); \
899 if (err) \
900 return err; \
901 } while (0)
903 static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
905 struct serio *serio;
907 if (!dev)
908 return -ENODEV;
910 serio = to_serio_port(dev);
912 SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type);
913 SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto);
914 SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id);
915 SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra);
916 SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X",
917 serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
919 return 0;
921 #undef SERIO_ADD_UEVENT_VAR
923 #else
925 static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
927 return -ENODEV;
930 #endif /* CONFIG_HOTPLUG */
932 #ifdef CONFIG_PM
933 static int serio_suspend(struct device *dev)
935 struct serio *serio = to_serio_port(dev);
937 serio_cleanup(serio);
939 return 0;
942 static int serio_resume(struct device *dev)
944 struct serio *serio = to_serio_port(dev);
947 * Driver reconnect can take a while, so better let kseriod
948 * deal with it.
950 serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
952 return 0;
955 static const struct dev_pm_ops serio_pm_ops = {
956 .suspend = serio_suspend,
957 .resume = serio_resume,
958 .poweroff = serio_suspend,
959 .restore = serio_resume,
961 #endif /* CONFIG_PM */
963 /* called from serio_driver->connect/disconnect methods under serio_mutex */
964 int serio_open(struct serio *serio, struct serio_driver *drv)
966 serio_set_drv(serio, drv);
968 if (serio->open && serio->open(serio)) {
969 serio_set_drv(serio, NULL);
970 return -1;
972 return 0;
974 EXPORT_SYMBOL(serio_open);
976 /* called from serio_driver->connect/disconnect methods under serio_mutex */
977 void serio_close(struct serio *serio)
979 if (serio->close)
980 serio->close(serio);
982 serio_set_drv(serio, NULL);
984 EXPORT_SYMBOL(serio_close);
986 irqreturn_t serio_interrupt(struct serio *serio,
987 unsigned char data, unsigned int dfl)
989 unsigned long flags;
990 irqreturn_t ret = IRQ_NONE;
992 spin_lock_irqsave(&serio->lock, flags);
994 if (likely(serio->drv)) {
995 ret = serio->drv->interrupt(serio, data, dfl);
996 } else if (!dfl && device_is_registered(&serio->dev)) {
997 serio_rescan(serio);
998 ret = IRQ_HANDLED;
1001 spin_unlock_irqrestore(&serio->lock, flags);
1003 return ret;
1005 EXPORT_SYMBOL(serio_interrupt);
1007 static struct bus_type serio_bus = {
1008 .name = "serio",
1009 .dev_attrs = serio_device_attrs,
1010 .drv_attrs = serio_driver_attrs,
1011 .match = serio_bus_match,
1012 .uevent = serio_uevent,
1013 .probe = serio_driver_probe,
1014 .remove = serio_driver_remove,
1015 .shutdown = serio_shutdown,
1016 #ifdef CONFIG_PM
1017 .pm = &serio_pm_ops,
1018 #endif
1021 static int __init serio_init(void)
1023 int error;
1025 error = bus_register(&serio_bus);
1026 if (error) {
1027 pr_err("Failed to register serio bus, error: %d\n", error);
1028 return error;
1031 return 0;
1034 static void __exit serio_exit(void)
1036 bus_unregister(&serio_bus);
1039 * There should not be any outstanding events but work may
1040 * still be scheduled so simply cancel it.
1042 cancel_work_sync(&serio_event_work);
1045 subsys_initcall(serio_init);
1046 module_exit(serio_exit);