2 * The Serio abstraction module
4 * Copyright (c) 1999-2004 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 * Copyright (c) 2003 Daniele Bellucci
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29 #include <linux/stddef.h>
30 #include <linux/module.h>
31 #include <linux/serio.h>
32 #include <linux/errno.h>
33 #include <linux/wait.h>
34 #include <linux/sched.h>
35 #include <linux/slab.h>
36 #include <linux/kthread.h>
37 #include <linux/mutex.h>
38 #include <linux/freezer.h>
40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
41 MODULE_DESCRIPTION("Serio abstraction core");
42 MODULE_LICENSE("GPL");
44 EXPORT_SYMBOL(serio_interrupt
);
45 EXPORT_SYMBOL(__serio_register_port
);
46 EXPORT_SYMBOL(serio_unregister_port
);
47 EXPORT_SYMBOL(serio_unregister_child_port
);
48 EXPORT_SYMBOL(__serio_register_driver
);
49 EXPORT_SYMBOL(serio_unregister_driver
);
50 EXPORT_SYMBOL(serio_open
);
51 EXPORT_SYMBOL(serio_close
);
52 EXPORT_SYMBOL(serio_rescan
);
53 EXPORT_SYMBOL(serio_reconnect
);
56 * serio_mutex protects entire serio subsystem and is taken every time
57 * serio port or driver registrered or unregistered.
59 static DEFINE_MUTEX(serio_mutex
);
61 static LIST_HEAD(serio_list
);
63 static struct bus_type serio_bus
;
65 static void serio_add_port(struct serio
*serio
);
66 static void serio_reconnect_port(struct serio
*serio
);
67 static void serio_disconnect_port(struct serio
*serio
);
68 static void serio_attach_driver(struct serio_driver
*drv
);
70 static int serio_connect_driver(struct serio
*serio
, struct serio_driver
*drv
)
74 mutex_lock(&serio
->drv_mutex
);
75 retval
= drv
->connect(serio
, drv
);
76 mutex_unlock(&serio
->drv_mutex
);
81 static int serio_reconnect_driver(struct serio
*serio
)
85 mutex_lock(&serio
->drv_mutex
);
86 if (serio
->drv
&& serio
->drv
->reconnect
)
87 retval
= serio
->drv
->reconnect(serio
);
88 mutex_unlock(&serio
->drv_mutex
);
93 static void serio_disconnect_driver(struct serio
*serio
)
95 mutex_lock(&serio
->drv_mutex
);
97 serio
->drv
->disconnect(serio
);
98 mutex_unlock(&serio
->drv_mutex
);
101 static int serio_match_port(const struct serio_device_id
*ids
, struct serio
*serio
)
103 while (ids
->type
|| ids
->proto
) {
104 if ((ids
->type
== SERIO_ANY
|| ids
->type
== serio
->id
.type
) &&
105 (ids
->proto
== SERIO_ANY
|| ids
->proto
== serio
->id
.proto
) &&
106 (ids
->extra
== SERIO_ANY
|| ids
->extra
== serio
->id
.extra
) &&
107 (ids
->id
== SERIO_ANY
|| ids
->id
== serio
->id
.id
))
115 * Basic serio -> driver core mappings
118 static void serio_bind_driver(struct serio
*serio
, struct serio_driver
*drv
)
122 down_write(&serio_bus
.subsys
.rwsem
);
124 if (serio_match_port(drv
->id_table
, serio
)) {
125 serio
->dev
.driver
= &drv
->driver
;
126 if (serio_connect_driver(serio
, drv
)) {
127 serio
->dev
.driver
= NULL
;
130 error
= device_bind_driver(&serio
->dev
);
133 "serio: device_bind_driver() failed "
134 "for %s (%s) and %s, error: %d\n",
135 serio
->phys
, serio
->name
,
136 drv
->description
, error
);
137 serio_disconnect_driver(serio
);
138 serio
->dev
.driver
= NULL
;
143 up_write(&serio_bus
.subsys
.rwsem
);
146 static void serio_release_driver(struct serio
*serio
)
148 down_write(&serio_bus
.subsys
.rwsem
);
149 device_release_driver(&serio
->dev
);
150 up_write(&serio_bus
.subsys
.rwsem
);
153 static void serio_find_driver(struct serio
*serio
)
157 down_write(&serio_bus
.subsys
.rwsem
);
158 error
= device_attach(&serio
->dev
);
161 "serio: device_attach() failed for %s (%s), error: %d\n",
162 serio
->phys
, serio
->name
, error
);
163 up_write(&serio_bus
.subsys
.rwsem
);
168 * Serio event processing.
171 enum serio_event_type
{
173 SERIO_RECONNECT_PORT
,
179 enum serio_event_type type
;
181 struct module
*owner
;
182 struct list_head node
;
185 static DEFINE_SPINLOCK(serio_event_lock
); /* protects serio_event_list */
186 static LIST_HEAD(serio_event_list
);
187 static DECLARE_WAIT_QUEUE_HEAD(serio_wait
);
188 static struct task_struct
*serio_task
;
190 static int serio_queue_event(void *object
, struct module
*owner
,
191 enum serio_event_type event_type
)
194 struct serio_event
*event
;
197 spin_lock_irqsave(&serio_event_lock
, flags
);
200 * Scan event list for the other events for the same serio port,
201 * starting with the most recent one. If event is the same we
202 * do not need add new one. If event is of different type we
203 * need to add this event and should not look further because
204 * we need to preseve sequence of distinct events.
206 list_for_each_entry_reverse(event
, &serio_event_list
, node
) {
207 if (event
->object
== object
) {
208 if (event
->type
== event_type
)
214 event
= kmalloc(sizeof(struct serio_event
), GFP_ATOMIC
);
217 "serio: Not enough memory to queue event %d\n",
223 if (!try_module_get(owner
)) {
225 "serio: Can't get module reference, dropping event %d\n",
232 event
->type
= event_type
;
233 event
->object
= object
;
234 event
->owner
= owner
;
236 list_add_tail(&event
->node
, &serio_event_list
);
237 wake_up(&serio_wait
);
240 spin_unlock_irqrestore(&serio_event_lock
, flags
);
244 static void serio_free_event(struct serio_event
*event
)
246 module_put(event
->owner
);
250 static void serio_remove_duplicate_events(struct serio_event
*event
)
252 struct list_head
*node
, *next
;
253 struct serio_event
*e
;
256 spin_lock_irqsave(&serio_event_lock
, flags
);
258 list_for_each_safe(node
, next
, &serio_event_list
) {
259 e
= list_entry(node
, struct serio_event
, node
);
260 if (event
->object
== e
->object
) {
262 * If this event is of different type we should not
263 * look further - we only suppress duplicate events
264 * that were sent back-to-back.
266 if (event
->type
!= e
->type
)
274 spin_unlock_irqrestore(&serio_event_lock
, flags
);
278 static struct serio_event
*serio_get_event(void)
280 struct serio_event
*event
;
281 struct list_head
*node
;
284 spin_lock_irqsave(&serio_event_lock
, flags
);
286 if (list_empty(&serio_event_list
)) {
287 spin_unlock_irqrestore(&serio_event_lock
, flags
);
291 node
= serio_event_list
.next
;
292 event
= list_entry(node
, struct serio_event
, node
);
295 spin_unlock_irqrestore(&serio_event_lock
, flags
);
300 static void serio_handle_event(void)
302 struct serio_event
*event
;
304 mutex_lock(&serio_mutex
);
307 * Note that we handle only one event here to give swsusp
308 * a chance to freeze kseriod thread. Serio events should
309 * be pretty rare so we are not concerned about taking
312 if ((event
= serio_get_event())) {
314 switch (event
->type
) {
315 case SERIO_REGISTER_PORT
:
316 serio_add_port(event
->object
);
319 case SERIO_RECONNECT_PORT
:
320 serio_reconnect_port(event
->object
);
323 case SERIO_RESCAN_PORT
:
324 serio_disconnect_port(event
->object
);
325 serio_find_driver(event
->object
);
328 case SERIO_ATTACH_DRIVER
:
329 serio_attach_driver(event
->object
);
336 serio_remove_duplicate_events(event
);
337 serio_free_event(event
);
340 mutex_unlock(&serio_mutex
);
344 * Remove all events that have been submitted for a given serio port.
346 static void serio_remove_pending_events(struct serio
*serio
)
348 struct list_head
*node
, *next
;
349 struct serio_event
*event
;
352 spin_lock_irqsave(&serio_event_lock
, flags
);
354 list_for_each_safe(node
, next
, &serio_event_list
) {
355 event
= list_entry(node
, struct serio_event
, node
);
356 if (event
->object
== serio
) {
358 serio_free_event(event
);
362 spin_unlock_irqrestore(&serio_event_lock
, flags
);
366 * Destroy child serio port (if any) that has not been fully registered yet.
368 * Note that we rely on the fact that port can have only one child and therefore
369 * only one child registration request can be pending. Additionally, children
370 * are registered by driver's connect() handler so there can't be a grandchild
371 * pending registration together with a child.
373 static struct serio
*serio_get_pending_child(struct serio
*parent
)
375 struct serio_event
*event
;
376 struct serio
*serio
, *child
= NULL
;
379 spin_lock_irqsave(&serio_event_lock
, flags
);
381 list_for_each_entry(event
, &serio_event_list
, node
) {
382 if (event
->type
== SERIO_REGISTER_PORT
) {
383 serio
= event
->object
;
384 if (serio
->parent
== parent
) {
391 spin_unlock_irqrestore(&serio_event_lock
, flags
);
395 static int serio_thread(void *nothing
)
398 serio_handle_event();
399 wait_event_interruptible(serio_wait
,
400 kthread_should_stop() || !list_empty(&serio_event_list
));
402 } while (!kthread_should_stop());
404 printk(KERN_DEBUG
"serio: kseriod exiting\n");
410 * Serio port operations
413 static ssize_t
serio_show_description(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
415 struct serio
*serio
= to_serio_port(dev
);
416 return sprintf(buf
, "%s\n", serio
->name
);
419 static ssize_t
serio_show_modalias(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
421 struct serio
*serio
= to_serio_port(dev
);
423 return sprintf(buf
, "serio:ty%02Xpr%02Xid%02Xex%02X\n",
424 serio
->id
.type
, serio
->id
.proto
, serio
->id
.id
, serio
->id
.extra
);
427 static ssize_t
serio_show_id_type(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
429 struct serio
*serio
= to_serio_port(dev
);
430 return sprintf(buf
, "%02x\n", serio
->id
.type
);
433 static ssize_t
serio_show_id_proto(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
435 struct serio
*serio
= to_serio_port(dev
);
436 return sprintf(buf
, "%02x\n", serio
->id
.proto
);
439 static ssize_t
serio_show_id_id(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
441 struct serio
*serio
= to_serio_port(dev
);
442 return sprintf(buf
, "%02x\n", serio
->id
.id
);
445 static ssize_t
serio_show_id_extra(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
447 struct serio
*serio
= to_serio_port(dev
);
448 return sprintf(buf
, "%02x\n", serio
->id
.extra
);
451 static DEVICE_ATTR(type
, S_IRUGO
, serio_show_id_type
, NULL
);
452 static DEVICE_ATTR(proto
, S_IRUGO
, serio_show_id_proto
, NULL
);
453 static DEVICE_ATTR(id
, S_IRUGO
, serio_show_id_id
, NULL
);
454 static DEVICE_ATTR(extra
, S_IRUGO
, serio_show_id_extra
, NULL
);
456 static struct attribute
*serio_device_id_attrs
[] = {
458 &dev_attr_proto
.attr
,
460 &dev_attr_extra
.attr
,
464 static struct attribute_group serio_id_attr_group
= {
466 .attrs
= serio_device_id_attrs
,
469 static ssize_t
serio_rebind_driver(struct device
*dev
, struct device_attribute
*attr
, const char *buf
, size_t count
)
471 struct serio
*serio
= to_serio_port(dev
);
472 struct device_driver
*drv
;
475 retval
= mutex_lock_interruptible(&serio_mutex
);
480 if (!strncmp(buf
, "none", count
)) {
481 serio_disconnect_port(serio
);
482 } else if (!strncmp(buf
, "reconnect", count
)) {
483 serio_reconnect_port(serio
);
484 } else if (!strncmp(buf
, "rescan", count
)) {
485 serio_disconnect_port(serio
);
486 serio_find_driver(serio
);
487 } else if ((drv
= driver_find(buf
, &serio_bus
)) != NULL
) {
488 serio_disconnect_port(serio
);
489 serio_bind_driver(serio
, to_serio_driver(drv
));
495 mutex_unlock(&serio_mutex
);
500 static ssize_t
serio_show_bind_mode(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
502 struct serio
*serio
= to_serio_port(dev
);
503 return sprintf(buf
, "%s\n", serio
->manual_bind
? "manual" : "auto");
506 static ssize_t
serio_set_bind_mode(struct device
*dev
, struct device_attribute
*attr
, const char *buf
, size_t count
)
508 struct serio
*serio
= to_serio_port(dev
);
512 if (!strncmp(buf
, "manual", count
)) {
513 serio
->manual_bind
= 1;
514 } else if (!strncmp(buf
, "auto", count
)) {
515 serio
->manual_bind
= 0;
523 static struct device_attribute serio_device_attrs
[] = {
524 __ATTR(description
, S_IRUGO
, serio_show_description
, NULL
),
525 __ATTR(modalias
, S_IRUGO
, serio_show_modalias
, NULL
),
526 __ATTR(drvctl
, S_IWUSR
, NULL
, serio_rebind_driver
),
527 __ATTR(bind_mode
, S_IWUSR
| S_IRUGO
, serio_show_bind_mode
, serio_set_bind_mode
),
532 static void serio_release_port(struct device
*dev
)
534 struct serio
*serio
= to_serio_port(dev
);
537 module_put(THIS_MODULE
);
541 * Prepare serio port for registration.
543 static void serio_init_port(struct serio
*serio
)
545 static atomic_t serio_no
= ATOMIC_INIT(0);
547 __module_get(THIS_MODULE
);
549 INIT_LIST_HEAD(&serio
->node
);
550 spin_lock_init(&serio
->lock
);
551 mutex_init(&serio
->drv_mutex
);
552 device_initialize(&serio
->dev
);
553 snprintf(serio
->dev
.bus_id
, sizeof(serio
->dev
.bus_id
),
554 "serio%ld", (long)atomic_inc_return(&serio_no
) - 1);
555 serio
->dev
.bus
= &serio_bus
;
556 serio
->dev
.release
= serio_release_port
;
558 serio
->dev
.parent
= &serio
->parent
->dev
;
559 serio
->depth
= serio
->parent
->depth
+ 1;
562 lockdep_set_subclass(&serio
->lock
, serio
->depth
);
566 * Complete serio port registration.
567 * Driver core will attempt to find appropriate driver for the port.
569 static void serio_add_port(struct serio
*serio
)
574 serio_pause_rx(serio
->parent
);
575 serio
->parent
->child
= serio
;
576 serio_continue_rx(serio
->parent
);
579 list_add_tail(&serio
->node
, &serio_list
);
582 error
= device_add(&serio
->dev
);
585 "serio: device_add() failed for %s (%s), error: %d\n",
586 serio
->phys
, serio
->name
, error
);
588 serio
->registered
= 1;
589 error
= sysfs_create_group(&serio
->dev
.kobj
, &serio_id_attr_group
);
592 "serio: sysfs_create_group() failed for %s (%s), error: %d\n",
593 serio
->phys
, serio
->name
, error
);
598 * serio_destroy_port() completes deregistration process and removes
599 * port from the system
601 static void serio_destroy_port(struct serio
*serio
)
605 child
= serio_get_pending_child(serio
);
607 serio_remove_pending_events(child
);
608 put_device(&child
->dev
);
615 serio_pause_rx(serio
->parent
);
616 serio
->parent
->child
= NULL
;
617 serio_continue_rx(serio
->parent
);
618 serio
->parent
= NULL
;
621 if (serio
->registered
) {
622 sysfs_remove_group(&serio
->dev
.kobj
, &serio_id_attr_group
);
623 device_del(&serio
->dev
);
624 serio
->registered
= 0;
627 list_del_init(&serio
->node
);
628 serio_remove_pending_events(serio
);
629 put_device(&serio
->dev
);
633 * Reconnect serio port and all its children (re-initialize attached devices)
635 static void serio_reconnect_port(struct serio
*serio
)
638 if (serio_reconnect_driver(serio
)) {
639 serio_disconnect_port(serio
);
640 serio_find_driver(serio
);
641 /* Ok, old children are now gone, we are done */
644 serio
= serio
->child
;
649 * serio_disconnect_port() unbinds a port from its driver. As a side effect
650 * all child ports are unbound and destroyed.
652 static void serio_disconnect_port(struct serio
*serio
)
654 struct serio
*s
, *parent
;
658 * Children ports should be disconnected and destroyed
659 * first, staring with the leaf one, since we don't want
662 for (s
= serio
; s
->child
; s
= s
->child
)
668 serio_release_driver(s
);
669 serio_destroy_port(s
);
670 } while ((s
= parent
) != serio
);
674 * Ok, no children left, now disconnect this port
676 serio_release_driver(serio
);
679 void serio_rescan(struct serio
*serio
)
681 serio_queue_event(serio
, NULL
, SERIO_RESCAN_PORT
);
684 void serio_reconnect(struct serio
*serio
)
686 serio_queue_event(serio
, NULL
, SERIO_RECONNECT_PORT
);
690 * Submits register request to kseriod for subsequent execution.
691 * Note that port registration is always asynchronous.
693 void __serio_register_port(struct serio
*serio
, struct module
*owner
)
695 serio_init_port(serio
);
696 serio_queue_event(serio
, owner
, SERIO_REGISTER_PORT
);
700 * Synchronously unregisters serio port.
702 void serio_unregister_port(struct serio
*serio
)
704 mutex_lock(&serio_mutex
);
705 serio_disconnect_port(serio
);
706 serio_destroy_port(serio
);
707 mutex_unlock(&serio_mutex
);
711 * Safely unregisters child port if one is present.
713 void serio_unregister_child_port(struct serio
*serio
)
715 mutex_lock(&serio_mutex
);
717 serio_disconnect_port(serio
->child
);
718 serio_destroy_port(serio
->child
);
720 mutex_unlock(&serio_mutex
);
725 * Serio driver operations
728 static ssize_t
serio_driver_show_description(struct device_driver
*drv
, char *buf
)
730 struct serio_driver
*driver
= to_serio_driver(drv
);
731 return sprintf(buf
, "%s\n", driver
->description
? driver
->description
: "(none)");
734 static ssize_t
serio_driver_show_bind_mode(struct device_driver
*drv
, char *buf
)
736 struct serio_driver
*serio_drv
= to_serio_driver(drv
);
737 return sprintf(buf
, "%s\n", serio_drv
->manual_bind
? "manual" : "auto");
740 static ssize_t
serio_driver_set_bind_mode(struct device_driver
*drv
, const char *buf
, size_t count
)
742 struct serio_driver
*serio_drv
= to_serio_driver(drv
);
746 if (!strncmp(buf
, "manual", count
)) {
747 serio_drv
->manual_bind
= 1;
748 } else if (!strncmp(buf
, "auto", count
)) {
749 serio_drv
->manual_bind
= 0;
758 static struct driver_attribute serio_driver_attrs
[] = {
759 __ATTR(description
, S_IRUGO
, serio_driver_show_description
, NULL
),
760 __ATTR(bind_mode
, S_IWUSR
| S_IRUGO
,
761 serio_driver_show_bind_mode
, serio_driver_set_bind_mode
),
765 static int serio_driver_probe(struct device
*dev
)
767 struct serio
*serio
= to_serio_port(dev
);
768 struct serio_driver
*drv
= to_serio_driver(dev
->driver
);
770 return serio_connect_driver(serio
, drv
);
773 static int serio_driver_remove(struct device
*dev
)
775 struct serio
*serio
= to_serio_port(dev
);
777 serio_disconnect_driver(serio
);
781 static void serio_attach_driver(struct serio_driver
*drv
)
785 error
= driver_attach(&drv
->driver
);
788 "serio: driver_attach() failed for %s with error %d\n",
789 drv
->driver
.name
, error
);
792 int __serio_register_driver(struct serio_driver
*drv
, struct module
*owner
, const char *mod_name
)
794 int manual_bind
= drv
->manual_bind
;
797 drv
->driver
.bus
= &serio_bus
;
798 drv
->driver
.owner
= owner
;
799 drv
->driver
.mod_name
= mod_name
;
802 * Temporarily disable automatic binding because probing
803 * takes long time and we are better off doing it in kseriod
805 drv
->manual_bind
= 1;
807 error
= driver_register(&drv
->driver
);
810 "serio: driver_register() failed for %s, error: %d\n",
811 drv
->driver
.name
, error
);
816 * Restore original bind mode and let kseriod bind the
817 * driver to free ports
820 drv
->manual_bind
= 0;
821 error
= serio_queue_event(drv
, NULL
, SERIO_ATTACH_DRIVER
);
823 driver_unregister(&drv
->driver
);
831 void serio_unregister_driver(struct serio_driver
*drv
)
835 mutex_lock(&serio_mutex
);
836 drv
->manual_bind
= 1; /* so serio_find_driver ignores it */
839 list_for_each_entry(serio
, &serio_list
, node
) {
840 if (serio
->drv
== drv
) {
841 serio_disconnect_port(serio
);
842 serio_find_driver(serio
);
843 /* we could've deleted some ports, restart */
848 driver_unregister(&drv
->driver
);
849 mutex_unlock(&serio_mutex
);
852 static void serio_set_drv(struct serio
*serio
, struct serio_driver
*drv
)
854 serio_pause_rx(serio
);
856 serio_continue_rx(serio
);
859 static int serio_bus_match(struct device
*dev
, struct device_driver
*drv
)
861 struct serio
*serio
= to_serio_port(dev
);
862 struct serio_driver
*serio_drv
= to_serio_driver(drv
);
864 if (serio
->manual_bind
|| serio_drv
->manual_bind
)
867 return serio_match_port(serio_drv
->id_table
, serio
);
870 #ifdef CONFIG_HOTPLUG
872 #define SERIO_ADD_UEVENT_VAR(fmt, val...) \
874 int err = add_uevent_var(envp, num_envp, &i, \
875 buffer, buffer_size, &len, \
881 static int serio_uevent(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
)
890 serio
= to_serio_port(dev
);
892 SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio
->id
.type
);
893 SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio
->id
.proto
);
894 SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio
->id
.id
);
895 SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio
->id
.extra
);
896 SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X",
897 serio
->id
.type
, serio
->id
.proto
, serio
->id
.id
, serio
->id
.extra
);
902 #undef SERIO_ADD_UEVENT_VAR
906 static int serio_uevent(struct device
*dev
, char **envp
, int num_envp
, char *buffer
, int buffer_size
)
911 #endif /* CONFIG_HOTPLUG */
913 static int serio_resume(struct device
*dev
)
915 struct serio
*serio
= to_serio_port(dev
);
917 if (serio_reconnect_driver(serio
)) {
919 * Driver re-probing can take a while, so better let kseriod
928 /* called from serio_driver->connect/disconnect methods under serio_mutex */
929 int serio_open(struct serio
*serio
, struct serio_driver
*drv
)
931 serio_set_drv(serio
, drv
);
933 if (serio
->open
&& serio
->open(serio
)) {
934 serio_set_drv(serio
, NULL
);
940 /* called from serio_driver->connect/disconnect methods under serio_mutex */
941 void serio_close(struct serio
*serio
)
946 serio_set_drv(serio
, NULL
);
949 irqreturn_t
serio_interrupt(struct serio
*serio
,
950 unsigned char data
, unsigned int dfl
)
953 irqreturn_t ret
= IRQ_NONE
;
955 spin_lock_irqsave(&serio
->lock
, flags
);
957 if (likely(serio
->drv
)) {
958 ret
= serio
->drv
->interrupt(serio
, data
, dfl
);
959 } else if (!dfl
&& serio
->registered
) {
964 spin_unlock_irqrestore(&serio
->lock
, flags
);
969 static struct bus_type serio_bus
= {
971 .dev_attrs
= serio_device_attrs
,
972 .drv_attrs
= serio_driver_attrs
,
973 .match
= serio_bus_match
,
974 .uevent
= serio_uevent
,
975 .probe
= serio_driver_probe
,
976 .remove
= serio_driver_remove
,
977 .resume
= serio_resume
,
980 static int __init
serio_init(void)
984 error
= bus_register(&serio_bus
);
986 printk(KERN_ERR
"serio: failed to register serio bus, error: %d\n", error
);
990 serio_task
= kthread_run(serio_thread
, NULL
, "kseriod");
991 if (IS_ERR(serio_task
)) {
992 bus_unregister(&serio_bus
);
993 error
= PTR_ERR(serio_task
);
994 printk(KERN_ERR
"serio: Failed to start kseriod, error: %d\n", error
);
1001 static void __exit
serio_exit(void)
1003 bus_unregister(&serio_bus
);
1004 kthread_stop(serio_task
);
1007 subsys_initcall(serio_init
);
1008 module_exit(serio_exit
);