Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * The Serio abstraction module | |
3 | * | |
4 | * Copyright (c) 1999-2004 Vojtech Pavlik | |
5 | * Copyright (c) 2004 Dmitry Torokhov | |
6 | * Copyright (c) 2003 Daniele Bellucci | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Should you need to contact me, the author, you can do so either by | |
25 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
26 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
27 | */ | |
28 | ||
29 | #include <linux/stddef.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/serio.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/wait.h> | |
1da177e4 | 34 | #include <linux/sched.h> |
1da177e4 | 35 | #include <linux/slab.h> |
3c803e8e | 36 | #include <linux/kthread.h> |
1da177e4 LT |
37 | |
38 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
39 | MODULE_DESCRIPTION("Serio abstraction core"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
42 | EXPORT_SYMBOL(serio_interrupt); | |
43 | EXPORT_SYMBOL(__serio_register_port); | |
44 | EXPORT_SYMBOL(serio_unregister_port); | |
3c803e8e | 45 | EXPORT_SYMBOL(serio_unregister_child_port); |
1da177e4 LT |
46 | EXPORT_SYMBOL(__serio_unregister_port_delayed); |
47 | EXPORT_SYMBOL(__serio_register_driver); | |
48 | EXPORT_SYMBOL(serio_unregister_driver); | |
49 | EXPORT_SYMBOL(serio_open); | |
50 | EXPORT_SYMBOL(serio_close); | |
51 | EXPORT_SYMBOL(serio_rescan); | |
52 | EXPORT_SYMBOL(serio_reconnect); | |
53 | ||
54 | /* | |
55 | * serio_sem protects entire serio subsystem and is taken every time | |
56 | * serio port or driver registrered or unregistered. | |
57 | */ | |
58 | static DECLARE_MUTEX(serio_sem); | |
59 | ||
60 | static LIST_HEAD(serio_list); | |
61 | ||
62 | static struct bus_type serio_bus = { | |
63 | .name = "serio", | |
64 | }; | |
65 | ||
66 | static void serio_add_port(struct serio *serio); | |
67 | static void serio_destroy_port(struct serio *serio); | |
68 | static void serio_reconnect_port(struct serio *serio); | |
69 | static void serio_disconnect_port(struct serio *serio); | |
70 | ||
3c803e8e LT |
71 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
72 | { | |
73 | int retval; | |
74 | ||
75 | down(&serio->drv_sem); | |
76 | retval = drv->connect(serio, drv); | |
77 | up(&serio->drv_sem); | |
78 | ||
79 | return retval; | |
80 | } | |
81 | ||
82 | static int serio_reconnect_driver(struct serio *serio) | |
83 | { | |
84 | int retval = -1; | |
85 | ||
86 | down(&serio->drv_sem); | |
87 | if (serio->drv && serio->drv->reconnect) | |
88 | retval = serio->drv->reconnect(serio); | |
89 | up(&serio->drv_sem); | |
90 | ||
91 | return retval; | |
92 | } | |
93 | ||
94 | static void serio_disconnect_driver(struct serio *serio) | |
95 | { | |
96 | down(&serio->drv_sem); | |
97 | if (serio->drv) | |
98 | serio->drv->disconnect(serio); | |
99 | up(&serio->drv_sem); | |
100 | } | |
101 | ||
1da177e4 LT |
102 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
103 | { | |
104 | while (ids->type || ids->proto) { | |
105 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && | |
106 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && | |
107 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && | |
108 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) | |
109 | return 1; | |
110 | ids++; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Basic serio -> driver core mappings | |
117 | */ | |
118 | ||
119 | static void serio_bind_driver(struct serio *serio, struct serio_driver *drv) | |
120 | { | |
121 | down_write(&serio_bus.subsys.rwsem); | |
122 | ||
123 | if (serio_match_port(drv->id_table, serio)) { | |
124 | serio->dev.driver = &drv->driver; | |
3c803e8e | 125 | if (serio_connect_driver(serio, drv)) { |
1da177e4 LT |
126 | serio->dev.driver = NULL; |
127 | goto out; | |
128 | } | |
129 | device_bind_driver(&serio->dev); | |
130 | } | |
131 | out: | |
132 | up_write(&serio_bus.subsys.rwsem); | |
133 | } | |
134 | ||
135 | static void serio_release_driver(struct serio *serio) | |
136 | { | |
137 | down_write(&serio_bus.subsys.rwsem); | |
138 | device_release_driver(&serio->dev); | |
139 | up_write(&serio_bus.subsys.rwsem); | |
140 | } | |
141 | ||
142 | static void serio_find_driver(struct serio *serio) | |
143 | { | |
144 | down_write(&serio_bus.subsys.rwsem); | |
145 | device_attach(&serio->dev); | |
146 | up_write(&serio_bus.subsys.rwsem); | |
147 | } | |
148 | ||
149 | ||
150 | /* | |
151 | * Serio event processing. | |
152 | */ | |
153 | ||
154 | enum serio_event_type { | |
155 | SERIO_RESCAN, | |
156 | SERIO_RECONNECT, | |
157 | SERIO_REGISTER_PORT, | |
158 | SERIO_UNREGISTER_PORT, | |
159 | SERIO_REGISTER_DRIVER, | |
160 | }; | |
161 | ||
162 | struct serio_event { | |
163 | enum serio_event_type type; | |
164 | void *object; | |
165 | struct module *owner; | |
166 | struct list_head node; | |
167 | }; | |
168 | ||
169 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
170 | static LIST_HEAD(serio_event_list); | |
171 | static DECLARE_WAIT_QUEUE_HEAD(serio_wait); | |
3c803e8e | 172 | static struct task_struct *serio_task; |
1da177e4 LT |
173 | |
174 | static void serio_queue_event(void *object, struct module *owner, | |
175 | enum serio_event_type event_type) | |
176 | { | |
177 | unsigned long flags; | |
178 | struct serio_event *event; | |
179 | ||
180 | spin_lock_irqsave(&serio_event_lock, flags); | |
181 | ||
182 | /* | |
3c803e8e | 183 | * Scan event list for the other events for the same serio port, |
1da177e4 LT |
184 | * starting with the most recent one. If event is the same we |
185 | * do not need add new one. If event is of different type we | |
186 | * need to add this event and should not look further because | |
187 | * we need to preseve sequence of distinct events. | |
3c803e8e | 188 | */ |
1da177e4 LT |
189 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
190 | if (event->object == object) { | |
191 | if (event->type == event_type) | |
192 | goto out; | |
193 | break; | |
194 | } | |
195 | } | |
196 | ||
197 | if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) { | |
198 | if (!try_module_get(owner)) { | |
199 | printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type); | |
200 | goto out; | |
201 | } | |
202 | ||
203 | event->type = event_type; | |
204 | event->object = object; | |
205 | event->owner = owner; | |
206 | ||
207 | list_add_tail(&event->node, &serio_event_list); | |
208 | wake_up(&serio_wait); | |
209 | } else { | |
210 | printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type); | |
211 | } | |
212 | out: | |
213 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
214 | } | |
215 | ||
216 | static void serio_free_event(struct serio_event *event) | |
217 | { | |
218 | module_put(event->owner); | |
219 | kfree(event); | |
220 | } | |
221 | ||
222 | static void serio_remove_duplicate_events(struct serio_event *event) | |
223 | { | |
224 | struct list_head *node, *next; | |
225 | struct serio_event *e; | |
226 | unsigned long flags; | |
227 | ||
228 | spin_lock_irqsave(&serio_event_lock, flags); | |
229 | ||
230 | list_for_each_safe(node, next, &serio_event_list) { | |
231 | e = list_entry(node, struct serio_event, node); | |
232 | if (event->object == e->object) { | |
233 | /* | |
234 | * If this event is of different type we should not | |
235 | * look further - we only suppress duplicate events | |
236 | * that were sent back-to-back. | |
237 | */ | |
238 | if (event->type != e->type) | |
239 | break; | |
240 | ||
241 | list_del_init(node); | |
242 | serio_free_event(e); | |
243 | } | |
244 | } | |
245 | ||
246 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
247 | } | |
248 | ||
249 | ||
250 | static struct serio_event *serio_get_event(void) | |
251 | { | |
252 | struct serio_event *event; | |
253 | struct list_head *node; | |
254 | unsigned long flags; | |
255 | ||
256 | spin_lock_irqsave(&serio_event_lock, flags); | |
257 | ||
258 | if (list_empty(&serio_event_list)) { | |
259 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | node = serio_event_list.next; | |
264 | event = list_entry(node, struct serio_event, node); | |
265 | list_del_init(node); | |
266 | ||
267 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
268 | ||
269 | return event; | |
270 | } | |
271 | ||
272 | static void serio_handle_events(void) | |
273 | { | |
274 | struct serio_event *event; | |
275 | struct serio_driver *serio_drv; | |
276 | ||
277 | down(&serio_sem); | |
278 | ||
279 | while ((event = serio_get_event())) { | |
280 | ||
281 | switch (event->type) { | |
282 | case SERIO_REGISTER_PORT: | |
283 | serio_add_port(event->object); | |
284 | break; | |
285 | ||
286 | case SERIO_UNREGISTER_PORT: | |
287 | serio_disconnect_port(event->object); | |
288 | serio_destroy_port(event->object); | |
289 | break; | |
290 | ||
291 | case SERIO_RECONNECT: | |
292 | serio_reconnect_port(event->object); | |
293 | break; | |
294 | ||
295 | case SERIO_RESCAN: | |
296 | serio_disconnect_port(event->object); | |
297 | serio_find_driver(event->object); | |
298 | break; | |
299 | ||
300 | case SERIO_REGISTER_DRIVER: | |
301 | serio_drv = event->object; | |
302 | driver_register(&serio_drv->driver); | |
303 | break; | |
304 | ||
305 | default: | |
306 | break; | |
307 | } | |
308 | ||
309 | serio_remove_duplicate_events(event); | |
310 | serio_free_event(event); | |
311 | } | |
312 | ||
313 | up(&serio_sem); | |
314 | } | |
315 | ||
316 | /* | |
317 | * Remove all events that have been submitted for a given serio port. | |
318 | */ | |
319 | static void serio_remove_pending_events(struct serio *serio) | |
320 | { | |
321 | struct list_head *node, *next; | |
322 | struct serio_event *event; | |
323 | unsigned long flags; | |
324 | ||
325 | spin_lock_irqsave(&serio_event_lock, flags); | |
326 | ||
327 | list_for_each_safe(node, next, &serio_event_list) { | |
328 | event = list_entry(node, struct serio_event, node); | |
329 | if (event->object == serio) { | |
330 | list_del_init(node); | |
331 | serio_free_event(event); | |
332 | } | |
333 | } | |
334 | ||
335 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Destroy child serio port (if any) that has not been fully registered yet. | |
340 | * | |
341 | * Note that we rely on the fact that port can have only one child and therefore | |
342 | * only one child registration request can be pending. Additionally, children | |
343 | * are registered by driver's connect() handler so there can't be a grandchild | |
344 | * pending registration together with a child. | |
345 | */ | |
346 | static struct serio *serio_get_pending_child(struct serio *parent) | |
347 | { | |
348 | struct serio_event *event; | |
349 | struct serio *serio, *child = NULL; | |
350 | unsigned long flags; | |
351 | ||
352 | spin_lock_irqsave(&serio_event_lock, flags); | |
353 | ||
354 | list_for_each_entry(event, &serio_event_list, node) { | |
355 | if (event->type == SERIO_REGISTER_PORT) { | |
356 | serio = event->object; | |
357 | if (serio->parent == parent) { | |
358 | child = serio; | |
359 | break; | |
360 | } | |
361 | } | |
362 | } | |
363 | ||
364 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
365 | return child; | |
366 | } | |
367 | ||
368 | static int serio_thread(void *nothing) | |
369 | { | |
1da177e4 LT |
370 | do { |
371 | serio_handle_events(); | |
3c803e8e LT |
372 | wait_event_interruptible(serio_wait, |
373 | kthread_should_stop() || !list_empty(&serio_event_list)); | |
3e1d1d28 | 374 | try_to_freeze(); |
3c803e8e | 375 | } while (!kthread_should_stop()); |
1da177e4 LT |
376 | |
377 | printk(KERN_DEBUG "serio: kseriod exiting\n"); | |
3c803e8e | 378 | return 0; |
1da177e4 LT |
379 | } |
380 | ||
381 | ||
382 | /* | |
383 | * Serio port operations | |
384 | */ | |
385 | ||
e404e274 | 386 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
387 | { |
388 | struct serio *serio = to_serio_port(dev); | |
389 | return sprintf(buf, "%s\n", serio->name); | |
390 | } | |
391 | ||
ae87dff7 DT |
392 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
393 | { | |
394 | struct serio *serio = to_serio_port(dev); | |
395 | ||
396 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
397 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
398 | } | |
399 | ||
e404e274 | 400 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
401 | { |
402 | struct serio *serio = to_serio_port(dev); | |
403 | return sprintf(buf, "%02x\n", serio->id.type); | |
404 | } | |
405 | ||
e404e274 | 406 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
407 | { |
408 | struct serio *serio = to_serio_port(dev); | |
409 | return sprintf(buf, "%02x\n", serio->id.proto); | |
410 | } | |
411 | ||
e404e274 | 412 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
413 | { |
414 | struct serio *serio = to_serio_port(dev); | |
415 | return sprintf(buf, "%02x\n", serio->id.id); | |
416 | } | |
417 | ||
e404e274 | 418 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
419 | { |
420 | struct serio *serio = to_serio_port(dev); | |
421 | return sprintf(buf, "%02x\n", serio->id.extra); | |
422 | } | |
423 | ||
baae9561 DT |
424 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
425 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
426 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
427 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
428 | ||
429 | static struct attribute *serio_device_id_attrs[] = { | |
430 | &dev_attr_type.attr, | |
431 | &dev_attr_proto.attr, | |
432 | &dev_attr_id.attr, | |
433 | &dev_attr_extra.attr, | |
434 | NULL | |
435 | }; | |
436 | ||
437 | static struct attribute_group serio_id_attr_group = { | |
438 | .name = "id", | |
439 | .attrs = serio_device_id_attrs, | |
440 | }; | |
441 | ||
e404e274 | 442 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
443 | { |
444 | struct serio *serio = to_serio_port(dev); | |
445 | struct device_driver *drv; | |
446 | int retval; | |
447 | ||
448 | retval = down_interruptible(&serio_sem); | |
449 | if (retval) | |
450 | return retval; | |
451 | ||
452 | retval = count; | |
453 | if (!strncmp(buf, "none", count)) { | |
454 | serio_disconnect_port(serio); | |
455 | } else if (!strncmp(buf, "reconnect", count)) { | |
456 | serio_reconnect_port(serio); | |
457 | } else if (!strncmp(buf, "rescan", count)) { | |
458 | serio_disconnect_port(serio); | |
459 | serio_find_driver(serio); | |
460 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
461 | serio_disconnect_port(serio); | |
462 | serio_bind_driver(serio, to_serio_driver(drv)); | |
463 | put_driver(drv); | |
464 | } else { | |
465 | retval = -EINVAL; | |
466 | } | |
467 | ||
468 | up(&serio_sem); | |
469 | ||
470 | return retval; | |
471 | } | |
472 | ||
e404e274 | 473 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
474 | { |
475 | struct serio *serio = to_serio_port(dev); | |
476 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
477 | } | |
478 | ||
e404e274 | 479 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
480 | { |
481 | struct serio *serio = to_serio_port(dev); | |
482 | int retval; | |
483 | ||
484 | retval = count; | |
485 | if (!strncmp(buf, "manual", count)) { | |
486 | serio->manual_bind = 1; | |
487 | } else if (!strncmp(buf, "auto", count)) { | |
488 | serio->manual_bind = 0; | |
489 | } else { | |
490 | retval = -EINVAL; | |
491 | } | |
492 | ||
493 | return retval; | |
494 | } | |
495 | ||
496 | static struct device_attribute serio_device_attrs[] = { | |
497 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 498 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
499 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
500 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
501 | __ATTR_NULL | |
502 | }; | |
503 | ||
504 | ||
505 | static void serio_release_port(struct device *dev) | |
506 | { | |
507 | struct serio *serio = to_serio_port(dev); | |
508 | ||
509 | kfree(serio); | |
510 | module_put(THIS_MODULE); | |
511 | } | |
512 | ||
513 | /* | |
514 | * Prepare serio port for registration. | |
515 | */ | |
516 | static void serio_init_port(struct serio *serio) | |
517 | { | |
518 | static atomic_t serio_no = ATOMIC_INIT(0); | |
519 | ||
520 | __module_get(THIS_MODULE); | |
521 | ||
522 | spin_lock_init(&serio->lock); | |
523 | init_MUTEX(&serio->drv_sem); | |
524 | device_initialize(&serio->dev); | |
525 | snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id), | |
526 | "serio%ld", (long)atomic_inc_return(&serio_no) - 1); | |
527 | serio->dev.bus = &serio_bus; | |
528 | serio->dev.release = serio_release_port; | |
529 | if (serio->parent) | |
530 | serio->dev.parent = &serio->parent->dev; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Complete serio port registration. | |
535 | * Driver core will attempt to find appropriate driver for the port. | |
536 | */ | |
537 | static void serio_add_port(struct serio *serio) | |
538 | { | |
539 | if (serio->parent) { | |
540 | serio_pause_rx(serio->parent); | |
541 | serio->parent->child = serio; | |
542 | serio_continue_rx(serio->parent); | |
543 | } | |
544 | ||
545 | list_add_tail(&serio->node, &serio_list); | |
546 | if (serio->start) | |
547 | serio->start(serio); | |
548 | device_add(&serio->dev); | |
baae9561 | 549 | sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group); |
1da177e4 LT |
550 | serio->registered = 1; |
551 | } | |
552 | ||
553 | /* | |
554 | * serio_destroy_port() completes deregistration process and removes | |
555 | * port from the system | |
556 | */ | |
557 | static void serio_destroy_port(struct serio *serio) | |
558 | { | |
559 | struct serio *child; | |
560 | ||
561 | child = serio_get_pending_child(serio); | |
562 | if (child) { | |
563 | serio_remove_pending_events(child); | |
564 | put_device(&child->dev); | |
565 | } | |
566 | ||
567 | if (serio->stop) | |
568 | serio->stop(serio); | |
569 | ||
570 | if (serio->parent) { | |
571 | serio_pause_rx(serio->parent); | |
572 | serio->parent->child = NULL; | |
573 | serio_continue_rx(serio->parent); | |
574 | serio->parent = NULL; | |
575 | } | |
576 | ||
577 | if (serio->registered) { | |
baae9561 | 578 | sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group); |
1da177e4 LT |
579 | device_del(&serio->dev); |
580 | list_del_init(&serio->node); | |
581 | serio->registered = 0; | |
582 | } | |
583 | ||
584 | serio_remove_pending_events(serio); | |
585 | put_device(&serio->dev); | |
586 | } | |
587 | ||
588 | /* | |
589 | * Reconnect serio port and all its children (re-initialize attached devices) | |
590 | */ | |
591 | static void serio_reconnect_port(struct serio *serio) | |
592 | { | |
593 | do { | |
3c803e8e | 594 | if (serio_reconnect_driver(serio)) { |
1da177e4 LT |
595 | serio_disconnect_port(serio); |
596 | serio_find_driver(serio); | |
597 | /* Ok, old children are now gone, we are done */ | |
598 | break; | |
599 | } | |
600 | serio = serio->child; | |
601 | } while (serio); | |
602 | } | |
603 | ||
604 | /* | |
605 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
606 | * all child ports are unbound and destroyed. | |
607 | */ | |
608 | static void serio_disconnect_port(struct serio *serio) | |
609 | { | |
610 | struct serio *s, *parent; | |
611 | ||
612 | if (serio->child) { | |
613 | /* | |
614 | * Children ports should be disconnected and destroyed | |
615 | * first, staring with the leaf one, since we don't want | |
616 | * to do recursion | |
617 | */ | |
618 | for (s = serio; s->child; s = s->child) | |
619 | /* empty */; | |
620 | ||
621 | do { | |
622 | parent = s->parent; | |
623 | ||
624 | serio_release_driver(s); | |
625 | serio_destroy_port(s); | |
626 | } while ((s = parent) != serio); | |
627 | } | |
628 | ||
629 | /* | |
630 | * Ok, no children left, now disconnect this port | |
631 | */ | |
632 | serio_release_driver(serio); | |
633 | } | |
634 | ||
635 | void serio_rescan(struct serio *serio) | |
636 | { | |
637 | serio_queue_event(serio, NULL, SERIO_RESCAN); | |
638 | } | |
639 | ||
640 | void serio_reconnect(struct serio *serio) | |
641 | { | |
642 | serio_queue_event(serio, NULL, SERIO_RECONNECT); | |
643 | } | |
644 | ||
645 | /* | |
646 | * Submits register request to kseriod for subsequent execution. | |
647 | * Note that port registration is always asynchronous. | |
648 | */ | |
649 | void __serio_register_port(struct serio *serio, struct module *owner) | |
650 | { | |
651 | serio_init_port(serio); | |
652 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
653 | } | |
654 | ||
655 | /* | |
656 | * Synchronously unregisters serio port. | |
657 | */ | |
658 | void serio_unregister_port(struct serio *serio) | |
659 | { | |
660 | down(&serio_sem); | |
661 | serio_disconnect_port(serio); | |
662 | serio_destroy_port(serio); | |
663 | up(&serio_sem); | |
664 | } | |
665 | ||
3c803e8e LT |
666 | /* |
667 | * Safely unregisters child port if one is present. | |
668 | */ | |
669 | void serio_unregister_child_port(struct serio *serio) | |
670 | { | |
671 | down(&serio_sem); | |
672 | if (serio->child) { | |
673 | serio_disconnect_port(serio->child); | |
674 | serio_destroy_port(serio->child); | |
675 | } | |
676 | up(&serio_sem); | |
677 | } | |
678 | ||
1da177e4 LT |
679 | /* |
680 | * Submits register request to kseriod for subsequent execution. | |
681 | * Can be used when it is not obvious whether the serio_sem is | |
682 | * taken or not and when delayed execution is feasible. | |
683 | */ | |
684 | void __serio_unregister_port_delayed(struct serio *serio, struct module *owner) | |
685 | { | |
686 | serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT); | |
687 | } | |
688 | ||
689 | ||
690 | /* | |
691 | * Serio driver operations | |
692 | */ | |
693 | ||
694 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
695 | { | |
696 | struct serio_driver *driver = to_serio_driver(drv); | |
697 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
698 | } | |
699 | ||
700 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
701 | { | |
702 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
703 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
704 | } | |
705 | ||
706 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
707 | { | |
708 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
709 | int retval; | |
710 | ||
711 | retval = count; | |
712 | if (!strncmp(buf, "manual", count)) { | |
713 | serio_drv->manual_bind = 1; | |
714 | } else if (!strncmp(buf, "auto", count)) { | |
715 | serio_drv->manual_bind = 0; | |
716 | } else { | |
717 | retval = -EINVAL; | |
718 | } | |
719 | ||
720 | return retval; | |
721 | } | |
722 | ||
723 | ||
724 | static struct driver_attribute serio_driver_attrs[] = { | |
725 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
726 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
727 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
728 | __ATTR_NULL | |
729 | }; | |
730 | ||
731 | static int serio_driver_probe(struct device *dev) | |
732 | { | |
733 | struct serio *serio = to_serio_port(dev); | |
734 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
735 | ||
3c803e8e | 736 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
737 | } |
738 | ||
739 | static int serio_driver_remove(struct device *dev) | |
740 | { | |
741 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 742 | |
3c803e8e | 743 | serio_disconnect_driver(serio); |
1da177e4 LT |
744 | return 0; |
745 | } | |
746 | ||
747 | void __serio_register_driver(struct serio_driver *drv, struct module *owner) | |
748 | { | |
749 | drv->driver.bus = &serio_bus; | |
750 | drv->driver.probe = serio_driver_probe; | |
751 | drv->driver.remove = serio_driver_remove; | |
752 | ||
753 | serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER); | |
754 | } | |
755 | ||
756 | void serio_unregister_driver(struct serio_driver *drv) | |
757 | { | |
758 | struct serio *serio; | |
759 | ||
760 | down(&serio_sem); | |
761 | drv->manual_bind = 1; /* so serio_find_driver ignores it */ | |
762 | ||
763 | start_over: | |
764 | list_for_each_entry(serio, &serio_list, node) { | |
765 | if (serio->drv == drv) { | |
766 | serio_disconnect_port(serio); | |
767 | serio_find_driver(serio); | |
768 | /* we could've deleted some ports, restart */ | |
769 | goto start_over; | |
770 | } | |
771 | } | |
772 | ||
773 | driver_unregister(&drv->driver); | |
774 | up(&serio_sem); | |
775 | } | |
776 | ||
777 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
778 | { | |
1da177e4 LT |
779 | serio_pause_rx(serio); |
780 | serio->drv = drv; | |
781 | serio_continue_rx(serio); | |
1da177e4 LT |
782 | } |
783 | ||
784 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
785 | { | |
786 | struct serio *serio = to_serio_port(dev); | |
787 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
788 | ||
789 | if (serio->manual_bind || serio_drv->manual_bind) | |
790 | return 0; | |
791 | ||
792 | return serio_match_port(serio_drv->id_table, serio); | |
793 | } | |
794 | ||
795 | #ifdef CONFIG_HOTPLUG | |
796 | ||
ae87dff7 DT |
797 | #define SERIO_ADD_HOTPLUG_VAR(fmt, val...) \ |
798 | do { \ | |
799 | int err = add_hotplug_env_var(envp, num_envp, &i, \ | |
800 | buffer, buffer_size, &len, \ | |
801 | fmt, val); \ | |
802 | if (err) \ | |
803 | return err; \ | |
804 | } while (0) | |
805 | ||
1da177e4 LT |
806 | static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
807 | { | |
808 | struct serio *serio; | |
809 | int i = 0; | |
ae87dff7 | 810 | int len = 0; |
1da177e4 LT |
811 | |
812 | if (!dev) | |
813 | return -ENODEV; | |
814 | ||
815 | serio = to_serio_port(dev); | |
816 | ||
ae87dff7 DT |
817 | SERIO_ADD_HOTPLUG_VAR("SERIO_TYPE=%02x", serio->id.type); |
818 | SERIO_ADD_HOTPLUG_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
819 | SERIO_ADD_HOTPLUG_VAR("SERIO_ID=%02x", serio->id.id); | |
820 | SERIO_ADD_HOTPLUG_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
821 | SERIO_ADD_HOTPLUG_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
822 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
1da177e4 LT |
823 | envp[i] = NULL; |
824 | ||
825 | return 0; | |
826 | } | |
ae87dff7 | 827 | #undef SERIO_ADD_HOTPLUG_VAR |
1da177e4 LT |
828 | |
829 | #else | |
830 | ||
831 | static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) | |
832 | { | |
833 | return -ENODEV; | |
834 | } | |
835 | ||
836 | #endif /* CONFIG_HOTPLUG */ | |
837 | ||
838 | static int serio_resume(struct device *dev) | |
839 | { | |
840 | struct serio *serio = to_serio_port(dev); | |
841 | ||
3c803e8e | 842 | if (serio_reconnect_driver(serio)) { |
1da177e4 LT |
843 | /* |
844 | * Driver re-probing can take a while, so better let kseriod | |
845 | * deal with it. | |
846 | */ | |
847 | serio_rescan(serio); | |
848 | } | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | /* called from serio_driver->connect/disconnect methods under serio_sem */ | |
854 | int serio_open(struct serio *serio, struct serio_driver *drv) | |
855 | { | |
856 | serio_set_drv(serio, drv); | |
857 | ||
858 | if (serio->open && serio->open(serio)) { | |
859 | serio_set_drv(serio, NULL); | |
860 | return -1; | |
861 | } | |
862 | return 0; | |
863 | } | |
864 | ||
865 | /* called from serio_driver->connect/disconnect methods under serio_sem */ | |
866 | void serio_close(struct serio *serio) | |
867 | { | |
868 | if (serio->close) | |
869 | serio->close(serio); | |
870 | ||
871 | serio_set_drv(serio, NULL); | |
872 | } | |
873 | ||
874 | irqreturn_t serio_interrupt(struct serio *serio, | |
875 | unsigned char data, unsigned int dfl, struct pt_regs *regs) | |
876 | { | |
877 | unsigned long flags; | |
878 | irqreturn_t ret = IRQ_NONE; | |
879 | ||
880 | spin_lock_irqsave(&serio->lock, flags); | |
881 | ||
882 | if (likely(serio->drv)) { | |
883 | ret = serio->drv->interrupt(serio, data, dfl, regs); | |
884 | } else if (!dfl && serio->registered) { | |
885 | serio_rescan(serio); | |
886 | ret = IRQ_HANDLED; | |
887 | } | |
888 | ||
889 | spin_unlock_irqrestore(&serio->lock, flags); | |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
894 | static int __init serio_init(void) | |
895 | { | |
3c803e8e LT |
896 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); |
897 | if (IS_ERR(serio_task)) { | |
1da177e4 | 898 | printk(KERN_ERR "serio: Failed to start kseriod\n"); |
3c803e8e | 899 | return PTR_ERR(serio_task); |
1da177e4 LT |
900 | } |
901 | ||
902 | serio_bus.dev_attrs = serio_device_attrs; | |
903 | serio_bus.drv_attrs = serio_driver_attrs; | |
904 | serio_bus.match = serio_bus_match; | |
905 | serio_bus.hotplug = serio_hotplug; | |
906 | serio_bus.resume = serio_resume; | |
907 | bus_register(&serio_bus); | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | static void __exit serio_exit(void) | |
913 | { | |
914 | bus_unregister(&serio_bus); | |
3c803e8e | 915 | kthread_stop(serio_task); |
1da177e4 LT |
916 | } |
917 | ||
918 | module_init(serio_init); | |
919 | module_exit(serio_exit); |