2 * The Serio abstraction module
4 * Copyright (c) 1999-2004 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 * Copyright (c) 2003 Daniele Bellucci
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31 #include <linux/stddef.h>
32 #include <linux/module.h>
33 #include <linux/serio.h>
34 #include <linux/errno.h>
35 #include <linux/sched.h>
36 #include <linux/slab.h>
37 #include <linux/workqueue.h>
38 #include <linux/mutex.h>
40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
41 MODULE_DESCRIPTION("Serio abstraction core");
42 MODULE_LICENSE("GPL");
45 * serio_mutex protects entire serio subsystem and is taken every time
46 * serio port or driver registered or unregistered.
48 static DEFINE_MUTEX(serio_mutex
);
50 static LIST_HEAD(serio_list
);
52 static struct bus_type serio_bus
;
54 static void serio_add_port(struct serio
*serio
);
55 static int serio_reconnect_port(struct serio
*serio
);
56 static void serio_disconnect_port(struct serio
*serio
);
57 static void serio_reconnect_subtree(struct serio
*serio
);
58 static void serio_attach_driver(struct serio_driver
*drv
);
60 static int serio_connect_driver(struct serio
*serio
, struct serio_driver
*drv
)
64 mutex_lock(&serio
->drv_mutex
);
65 retval
= drv
->connect(serio
, drv
);
66 mutex_unlock(&serio
->drv_mutex
);
71 static int serio_reconnect_driver(struct serio
*serio
)
75 mutex_lock(&serio
->drv_mutex
);
76 if (serio
->drv
&& serio
->drv
->reconnect
)
77 retval
= serio
->drv
->reconnect(serio
);
78 mutex_unlock(&serio
->drv_mutex
);
83 static void serio_disconnect_driver(struct serio
*serio
)
85 mutex_lock(&serio
->drv_mutex
);
87 serio
->drv
->disconnect(serio
);
88 mutex_unlock(&serio
->drv_mutex
);
91 static int serio_match_port(const struct serio_device_id
*ids
, struct serio
*serio
)
93 while (ids
->type
|| ids
->proto
) {
94 if ((ids
->type
== SERIO_ANY
|| ids
->type
== serio
->id
.type
) &&
95 (ids
->proto
== SERIO_ANY
|| ids
->proto
== serio
->id
.proto
) &&
96 (ids
->extra
== SERIO_ANY
|| ids
->extra
== serio
->id
.extra
) &&
97 (ids
->id
== SERIO_ANY
|| ids
->id
== serio
->id
.id
))
105 * Basic serio -> driver core mappings
108 static int serio_bind_driver(struct serio
*serio
, struct serio_driver
*drv
)
112 if (serio_match_port(drv
->id_table
, serio
)) {
114 serio
->dev
.driver
= &drv
->driver
;
115 if (serio_connect_driver(serio
, drv
)) {
116 serio
->dev
.driver
= NULL
;
120 error
= device_bind_driver(&serio
->dev
);
122 dev_warn(&serio
->dev
,
123 "device_bind_driver() failed for %s (%s) and %s, error: %d\n",
124 serio
->phys
, serio
->name
,
125 drv
->description
, error
);
126 serio_disconnect_driver(serio
);
127 serio
->dev
.driver
= NULL
;
134 static void serio_find_driver(struct serio
*serio
)
138 error
= device_attach(&serio
->dev
);
140 dev_warn(&serio
->dev
,
141 "device_attach() failed for %s (%s), error: %d\n",
142 serio
->phys
, serio
->name
, error
);
147 * Serio event processing.
150 enum serio_event_type
{
152 SERIO_RECONNECT_PORT
,
153 SERIO_RECONNECT_SUBTREE
,
159 enum serio_event_type type
;
161 struct module
*owner
;
162 struct list_head node
;
165 static DEFINE_SPINLOCK(serio_event_lock
); /* protects serio_event_list */
166 static LIST_HEAD(serio_event_list
);
168 static struct serio_event
*serio_get_event(void)
170 struct serio_event
*event
= NULL
;
173 spin_lock_irqsave(&serio_event_lock
, flags
);
175 if (!list_empty(&serio_event_list
)) {
176 event
= list_first_entry(&serio_event_list
,
177 struct serio_event
, node
);
178 list_del_init(&event
->node
);
181 spin_unlock_irqrestore(&serio_event_lock
, flags
);
185 static void serio_free_event(struct serio_event
*event
)
187 module_put(event
->owner
);
191 static void serio_remove_duplicate_events(void *object
,
192 enum serio_event_type type
)
194 struct serio_event
*e
, *next
;
197 spin_lock_irqsave(&serio_event_lock
, flags
);
199 list_for_each_entry_safe(e
, next
, &serio_event_list
, node
) {
200 if (object
== e
->object
) {
202 * If this event is of different type we should not
203 * look further - we only suppress duplicate events
204 * that were sent back-to-back.
209 list_del_init(&e
->node
);
214 spin_unlock_irqrestore(&serio_event_lock
, flags
);
217 static void serio_handle_event(struct work_struct
*work
)
219 struct serio_event
*event
;
221 mutex_lock(&serio_mutex
);
223 while ((event
= serio_get_event())) {
225 switch (event
->type
) {
227 case SERIO_REGISTER_PORT
:
228 serio_add_port(event
->object
);
231 case SERIO_RECONNECT_PORT
:
232 serio_reconnect_port(event
->object
);
235 case SERIO_RESCAN_PORT
:
236 serio_disconnect_port(event
->object
);
237 serio_find_driver(event
->object
);
240 case SERIO_RECONNECT_SUBTREE
:
241 serio_reconnect_subtree(event
->object
);
244 case SERIO_ATTACH_DRIVER
:
245 serio_attach_driver(event
->object
);
249 serio_remove_duplicate_events(event
->object
, event
->type
);
250 serio_free_event(event
);
253 mutex_unlock(&serio_mutex
);
256 static DECLARE_WORK(serio_event_work
, serio_handle_event
);
258 static int serio_queue_event(void *object
, struct module
*owner
,
259 enum serio_event_type event_type
)
262 struct serio_event
*event
;
265 spin_lock_irqsave(&serio_event_lock
, flags
);
268 * Scan event list for the other events for the same serio port,
269 * starting with the most recent one. If event is the same we
270 * do not need add new one. If event is of different type we
271 * need to add this event and should not look further because
272 * we need to preseve sequence of distinct events.
274 list_for_each_entry_reverse(event
, &serio_event_list
, node
) {
275 if (event
->object
== object
) {
276 if (event
->type
== event_type
)
282 event
= kmalloc(sizeof(struct serio_event
), GFP_ATOMIC
);
284 pr_err("Not enough memory to queue event %d\n", event_type
);
289 if (!try_module_get(owner
)) {
290 pr_warning("Can't get module reference, dropping event %d\n",
297 event
->type
= event_type
;
298 event
->object
= object
;
299 event
->owner
= owner
;
301 list_add_tail(&event
->node
, &serio_event_list
);
302 queue_work(system_long_wq
, &serio_event_work
);
305 spin_unlock_irqrestore(&serio_event_lock
, flags
);
310 * Remove all events that have been submitted for a given
311 * object, be it serio port or driver.
313 static void serio_remove_pending_events(void *object
)
315 struct serio_event
*event
, *next
;
318 spin_lock_irqsave(&serio_event_lock
, flags
);
320 list_for_each_entry_safe(event
, next
, &serio_event_list
, node
) {
321 if (event
->object
== object
) {
322 list_del_init(&event
->node
);
323 serio_free_event(event
);
327 spin_unlock_irqrestore(&serio_event_lock
, flags
);
331 * Locate child serio port (if any) that has not been fully registered yet.
333 * Children are registered by driver's connect() handler so there can't be a
334 * grandchild pending registration together with a child.
336 static struct serio
*serio_get_pending_child(struct serio
*parent
)
338 struct serio_event
*event
;
339 struct serio
*serio
, *child
= NULL
;
342 spin_lock_irqsave(&serio_event_lock
, flags
);
344 list_for_each_entry(event
, &serio_event_list
, node
) {
345 if (event
->type
== SERIO_REGISTER_PORT
) {
346 serio
= event
->object
;
347 if (serio
->parent
== parent
) {
354 spin_unlock_irqrestore(&serio_event_lock
, flags
);
359 * Serio port operations
362 static ssize_t
serio_show_description(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
364 struct serio
*serio
= to_serio_port(dev
);
365 return sprintf(buf
, "%s\n", serio
->name
);
368 static ssize_t
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
[] = {
407 &dev_attr_proto
.attr
,
409 &dev_attr_extra
.attr
,
413 static struct attribute_group serio_id_attr_group
= {
415 .attrs
= serio_device_id_attrs
,
418 static const struct attribute_group
*serio_device_attr_groups
[] = {
419 &serio_id_attr_group
,
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
;
429 error
= mutex_lock_interruptible(&serio_mutex
);
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
);
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
);
466 if (!strncmp(buf
, "manual", count
)) {
467 serio
->manual_bind
= true;
468 } else if (!strncmp(buf
, "auto", count
)) {
469 serio
->manual_bind
= false;
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
),
486 static void serio_release_port(struct device
*dev
)
488 struct serio
*serio
= to_serio_port(dev
);
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
;
515 serio
->dev
.parent
= &serio
->parent
->dev
;
516 serio
->depth
= serio
->parent
->depth
+ 1;
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
;
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
);
542 error
= device_add(&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
)
557 while ((child
= serio_get_pending_child(serio
)) != NULL
) {
558 serio_remove_pending_events(child
);
559 put_device(&child
->dev
);
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
);
591 serio_disconnect_port(serio
);
592 serio_find_driver(serio
);
599 * Reconnect serio port and all its children (re-initialize attached
602 static void serio_reconnect_subtree(struct serio
*root
)
604 struct serio
*s
= root
;
608 error
= serio_reconnect_port(s
);
611 * Reconnect was successful, move on to do the
614 if (!list_empty(&s
->children
)) {
615 s
= list_first_entry(&s
->children
,
616 struct serio
, child_node
);
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.
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
);
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
)) {
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
664 struct serio
*parent
= s
->parent
;
666 device_release_driver(&s
->dev
);
667 serio_destroy_port(s
);
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
);
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
);
809 pr_warning("driver_attach() failed for %s with error %d\n",
810 drv
->driver
.name
, error
);
813 int __serio_register_driver(struct serio_driver
*drv
, struct module
*owner
, const char *mod_name
)
815 bool manual_bind
= drv
->manual_bind
;
818 drv
->driver
.bus
= &serio_bus
;
819 drv
->driver
.owner
= owner
;
820 drv
->driver
.mod_name
= mod_name
;
823 * Temporarily disable automatic binding because probing
824 * takes long time and we are better off doing it in kseriod
826 drv
->manual_bind
= true;
828 error
= driver_register(&drv
->driver
);
830 pr_err("driver_register() failed for %s, error: %d\n",
831 drv
->driver
.name
, error
);
836 * Restore original bind mode and let kseriod bind the
837 * driver to free ports
840 drv
->manual_bind
= false;
841 error
= serio_queue_event(drv
, NULL
, SERIO_ATTACH_DRIVER
);
843 driver_unregister(&drv
->driver
);
850 EXPORT_SYMBOL(__serio_register_driver
);
852 void serio_unregister_driver(struct serio_driver
*drv
)
856 mutex_lock(&serio_mutex
);
858 drv
->manual_bind
= true; /* so serio_find_driver ignores it */
859 serio_remove_pending_events(drv
);
862 list_for_each_entry(serio
, &serio_list
, node
) {
863 if (serio
->drv
== drv
) {
864 serio_disconnect_port(serio
);
865 serio_find_driver(serio
);
866 /* we could've deleted some ports, restart */
871 driver_unregister(&drv
->driver
);
872 mutex_unlock(&serio_mutex
);
874 EXPORT_SYMBOL(serio_unregister_driver
);
876 static void serio_set_drv(struct serio
*serio
, struct serio_driver
*drv
)
878 serio_pause_rx(serio
);
880 serio_continue_rx(serio
);
883 static int serio_bus_match(struct device
*dev
, struct device_driver
*drv
)
885 struct serio
*serio
= to_serio_port(dev
);
886 struct serio_driver
*serio_drv
= to_serio_driver(drv
);
888 if (serio
->manual_bind
|| serio_drv
->manual_bind
)
891 return serio_match_port(serio_drv
->id_table
, serio
);
894 #ifdef CONFIG_HOTPLUG
896 #define SERIO_ADD_UEVENT_VAR(fmt, val...) \
898 int err = add_uevent_var(env, fmt, val); \
903 static int serio_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
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
);
921 #undef SERIO_ADD_UEVENT_VAR
925 static int serio_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
930 #endif /* CONFIG_HOTPLUG */
933 static int serio_suspend(struct device
*dev
)
935 struct serio
*serio
= to_serio_port(dev
);
937 serio_cleanup(serio
);
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
950 serio_queue_event(serio
, NULL
, SERIO_RECONNECT_PORT
);
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
);
974 EXPORT_SYMBOL(serio_open
);
976 /* called from serio_driver->connect/disconnect methods under serio_mutex */
977 void serio_close(struct serio
*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
)
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
)) {
1001 spin_unlock_irqrestore(&serio
->lock
, flags
);
1005 EXPORT_SYMBOL(serio_interrupt
);
1007 static struct bus_type serio_bus
= {
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
,
1017 .pm
= &serio_pm_ops
,
1021 static int __init
serio_init(void)
1025 error
= bus_register(&serio_bus
);
1027 pr_err("Failed to register serio bus, error: %d\n", error
);
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
);