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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> |
c4e32e9f | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
40 | MODULE_DESCRIPTION("Serio abstraction core"); | |
41 | MODULE_LICENSE("GPL"); | |
42 | ||
43 | EXPORT_SYMBOL(serio_interrupt); | |
44 | EXPORT_SYMBOL(__serio_register_port); | |
45 | EXPORT_SYMBOL(serio_unregister_port); | |
3c803e8e | 46 | EXPORT_SYMBOL(serio_unregister_child_port); |
1da177e4 LT |
47 | EXPORT_SYMBOL(__serio_unregister_port_delayed); |
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); | |
54 | ||
55 | /* | |
c4e32e9f | 56 | * serio_mutex protects entire serio subsystem and is taken every time |
1da177e4 LT |
57 | * serio port or driver registrered or unregistered. |
58 | */ | |
c4e32e9f | 59 | static DEFINE_MUTEX(serio_mutex); |
1da177e4 LT |
60 | |
61 | static LIST_HEAD(serio_list); | |
62 | ||
30226f81 | 63 | static struct bus_type serio_bus; |
1da177e4 LT |
64 | |
65 | static void serio_add_port(struct serio *serio); | |
66 | static void serio_destroy_port(struct serio *serio); | |
67 | static void serio_reconnect_port(struct serio *serio); | |
68 | static void serio_disconnect_port(struct serio *serio); | |
69 | ||
3c803e8e LT |
70 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
71 | { | |
72 | int retval; | |
73 | ||
c4e32e9f | 74 | mutex_lock(&serio->drv_mutex); |
3c803e8e | 75 | retval = drv->connect(serio, drv); |
c4e32e9f | 76 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
77 | |
78 | return retval; | |
79 | } | |
80 | ||
81 | static int serio_reconnect_driver(struct serio *serio) | |
82 | { | |
83 | int retval = -1; | |
84 | ||
c4e32e9f | 85 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
86 | if (serio->drv && serio->drv->reconnect) |
87 | retval = serio->drv->reconnect(serio); | |
c4e32e9f | 88 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
89 | |
90 | return retval; | |
91 | } | |
92 | ||
93 | static void serio_disconnect_driver(struct serio *serio) | |
94 | { | |
c4e32e9f | 95 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
96 | if (serio->drv) |
97 | serio->drv->disconnect(serio); | |
c4e32e9f | 98 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
99 | } |
100 | ||
1da177e4 LT |
101 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
102 | { | |
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)) | |
108 | return 1; | |
109 | ids++; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Basic serio -> driver core mappings | |
116 | */ | |
117 | ||
118 | static void serio_bind_driver(struct serio *serio, struct serio_driver *drv) | |
119 | { | |
120 | down_write(&serio_bus.subsys.rwsem); | |
121 | ||
122 | if (serio_match_port(drv->id_table, serio)) { | |
123 | serio->dev.driver = &drv->driver; | |
3c803e8e | 124 | if (serio_connect_driver(serio, drv)) { |
1da177e4 LT |
125 | serio->dev.driver = NULL; |
126 | goto out; | |
127 | } | |
128 | device_bind_driver(&serio->dev); | |
129 | } | |
130 | out: | |
131 | up_write(&serio_bus.subsys.rwsem); | |
132 | } | |
133 | ||
134 | static void serio_release_driver(struct serio *serio) | |
135 | { | |
136 | down_write(&serio_bus.subsys.rwsem); | |
137 | device_release_driver(&serio->dev); | |
138 | up_write(&serio_bus.subsys.rwsem); | |
139 | } | |
140 | ||
141 | static void serio_find_driver(struct serio *serio) | |
142 | { | |
143 | down_write(&serio_bus.subsys.rwsem); | |
144 | device_attach(&serio->dev); | |
145 | up_write(&serio_bus.subsys.rwsem); | |
146 | } | |
147 | ||
148 | ||
149 | /* | |
150 | * Serio event processing. | |
151 | */ | |
152 | ||
153 | enum serio_event_type { | |
154 | SERIO_RESCAN, | |
155 | SERIO_RECONNECT, | |
156 | SERIO_REGISTER_PORT, | |
157 | SERIO_UNREGISTER_PORT, | |
158 | SERIO_REGISTER_DRIVER, | |
159 | }; | |
160 | ||
161 | struct serio_event { | |
162 | enum serio_event_type type; | |
163 | void *object; | |
164 | struct module *owner; | |
165 | struct list_head node; | |
166 | }; | |
167 | ||
168 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
169 | static LIST_HEAD(serio_event_list); | |
170 | static DECLARE_WAIT_QUEUE_HEAD(serio_wait); | |
3c803e8e | 171 | static struct task_struct *serio_task; |
1da177e4 LT |
172 | |
173 | static void serio_queue_event(void *object, struct module *owner, | |
174 | enum serio_event_type event_type) | |
175 | { | |
176 | unsigned long flags; | |
177 | struct serio_event *event; | |
178 | ||
179 | spin_lock_irqsave(&serio_event_lock, flags); | |
180 | ||
181 | /* | |
3c803e8e | 182 | * Scan event list for the other events for the same serio port, |
1da177e4 LT |
183 | * starting with the most recent one. If event is the same we |
184 | * do not need add new one. If event is of different type we | |
185 | * need to add this event and should not look further because | |
186 | * we need to preseve sequence of distinct events. | |
3c803e8e | 187 | */ |
1da177e4 LT |
188 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
189 | if (event->object == object) { | |
190 | if (event->type == event_type) | |
191 | goto out; | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
196 | if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) { | |
197 | if (!try_module_get(owner)) { | |
198 | printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type); | |
199 | goto out; | |
200 | } | |
201 | ||
202 | event->type = event_type; | |
203 | event->object = object; | |
204 | event->owner = owner; | |
205 | ||
206 | list_add_tail(&event->node, &serio_event_list); | |
207 | wake_up(&serio_wait); | |
208 | } else { | |
209 | printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type); | |
210 | } | |
211 | out: | |
212 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
213 | } | |
214 | ||
215 | static void serio_free_event(struct serio_event *event) | |
216 | { | |
217 | module_put(event->owner); | |
218 | kfree(event); | |
219 | } | |
220 | ||
221 | static void serio_remove_duplicate_events(struct serio_event *event) | |
222 | { | |
223 | struct list_head *node, *next; | |
224 | struct serio_event *e; | |
225 | unsigned long flags; | |
226 | ||
227 | spin_lock_irqsave(&serio_event_lock, flags); | |
228 | ||
229 | list_for_each_safe(node, next, &serio_event_list) { | |
230 | e = list_entry(node, struct serio_event, node); | |
231 | if (event->object == e->object) { | |
232 | /* | |
233 | * If this event is of different type we should not | |
234 | * look further - we only suppress duplicate events | |
235 | * that were sent back-to-back. | |
236 | */ | |
237 | if (event->type != e->type) | |
238 | break; | |
239 | ||
240 | list_del_init(node); | |
241 | serio_free_event(e); | |
242 | } | |
243 | } | |
244 | ||
245 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
246 | } | |
247 | ||
248 | ||
249 | static struct serio_event *serio_get_event(void) | |
250 | { | |
251 | struct serio_event *event; | |
252 | struct list_head *node; | |
253 | unsigned long flags; | |
254 | ||
255 | spin_lock_irqsave(&serio_event_lock, flags); | |
256 | ||
257 | if (list_empty(&serio_event_list)) { | |
258 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | node = serio_event_list.next; | |
263 | event = list_entry(node, struct serio_event, node); | |
264 | list_del_init(node); | |
265 | ||
266 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
267 | ||
268 | return event; | |
269 | } | |
270 | ||
9e50afd0 | 271 | static void serio_handle_event(void) |
1da177e4 LT |
272 | { |
273 | struct serio_event *event; | |
274 | struct serio_driver *serio_drv; | |
275 | ||
c4e32e9f | 276 | mutex_lock(&serio_mutex); |
1da177e4 | 277 | |
9e50afd0 DT |
278 | /* |
279 | * Note that we handle only one event here to give swsusp | |
280 | * a chance to freeze kseriod thread. Serio events should | |
281 | * be pretty rare so we are not concerned about taking | |
282 | * performance hit. | |
283 | */ | |
284 | if ((event = serio_get_event())) { | |
1da177e4 LT |
285 | |
286 | switch (event->type) { | |
287 | case SERIO_REGISTER_PORT: | |
288 | serio_add_port(event->object); | |
289 | break; | |
290 | ||
291 | case SERIO_UNREGISTER_PORT: | |
292 | serio_disconnect_port(event->object); | |
293 | serio_destroy_port(event->object); | |
294 | break; | |
295 | ||
296 | case SERIO_RECONNECT: | |
297 | serio_reconnect_port(event->object); | |
298 | break; | |
299 | ||
300 | case SERIO_RESCAN: | |
301 | serio_disconnect_port(event->object); | |
302 | serio_find_driver(event->object); | |
303 | break; | |
304 | ||
305 | case SERIO_REGISTER_DRIVER: | |
306 | serio_drv = event->object; | |
307 | driver_register(&serio_drv->driver); | |
308 | break; | |
309 | ||
310 | default: | |
311 | break; | |
312 | } | |
313 | ||
314 | serio_remove_duplicate_events(event); | |
315 | serio_free_event(event); | |
316 | } | |
317 | ||
c4e32e9f | 318 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
319 | } |
320 | ||
321 | /* | |
322 | * Remove all events that have been submitted for a given serio port. | |
323 | */ | |
324 | static void serio_remove_pending_events(struct serio *serio) | |
325 | { | |
326 | struct list_head *node, *next; | |
327 | struct serio_event *event; | |
328 | unsigned long flags; | |
329 | ||
330 | spin_lock_irqsave(&serio_event_lock, flags); | |
331 | ||
332 | list_for_each_safe(node, next, &serio_event_list) { | |
333 | event = list_entry(node, struct serio_event, node); | |
334 | if (event->object == serio) { | |
335 | list_del_init(node); | |
336 | serio_free_event(event); | |
337 | } | |
338 | } | |
339 | ||
340 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
341 | } | |
342 | ||
343 | /* | |
344 | * Destroy child serio port (if any) that has not been fully registered yet. | |
345 | * | |
346 | * Note that we rely on the fact that port can have only one child and therefore | |
347 | * only one child registration request can be pending. Additionally, children | |
348 | * are registered by driver's connect() handler so there can't be a grandchild | |
349 | * pending registration together with a child. | |
350 | */ | |
351 | static struct serio *serio_get_pending_child(struct serio *parent) | |
352 | { | |
353 | struct serio_event *event; | |
354 | struct serio *serio, *child = NULL; | |
355 | unsigned long flags; | |
356 | ||
357 | spin_lock_irqsave(&serio_event_lock, flags); | |
358 | ||
359 | list_for_each_entry(event, &serio_event_list, node) { | |
360 | if (event->type == SERIO_REGISTER_PORT) { | |
361 | serio = event->object; | |
362 | if (serio->parent == parent) { | |
363 | child = serio; | |
364 | break; | |
365 | } | |
366 | } | |
367 | } | |
368 | ||
369 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
370 | return child; | |
371 | } | |
372 | ||
373 | static int serio_thread(void *nothing) | |
374 | { | |
1da177e4 | 375 | do { |
9e50afd0 | 376 | serio_handle_event(); |
3c803e8e LT |
377 | wait_event_interruptible(serio_wait, |
378 | kthread_should_stop() || !list_empty(&serio_event_list)); | |
3e1d1d28 | 379 | try_to_freeze(); |
3c803e8e | 380 | } while (!kthread_should_stop()); |
1da177e4 LT |
381 | |
382 | printk(KERN_DEBUG "serio: kseriod exiting\n"); | |
3c803e8e | 383 | return 0; |
1da177e4 LT |
384 | } |
385 | ||
386 | ||
387 | /* | |
388 | * Serio port operations | |
389 | */ | |
390 | ||
e404e274 | 391 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
392 | { |
393 | struct serio *serio = to_serio_port(dev); | |
394 | return sprintf(buf, "%s\n", serio->name); | |
395 | } | |
396 | ||
ae87dff7 DT |
397 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
398 | { | |
399 | struct serio *serio = to_serio_port(dev); | |
400 | ||
401 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
402 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
403 | } | |
404 | ||
e404e274 | 405 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
406 | { |
407 | struct serio *serio = to_serio_port(dev); | |
408 | return sprintf(buf, "%02x\n", serio->id.type); | |
409 | } | |
410 | ||
e404e274 | 411 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
412 | { |
413 | struct serio *serio = to_serio_port(dev); | |
414 | return sprintf(buf, "%02x\n", serio->id.proto); | |
415 | } | |
416 | ||
e404e274 | 417 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
418 | { |
419 | struct serio *serio = to_serio_port(dev); | |
420 | return sprintf(buf, "%02x\n", serio->id.id); | |
421 | } | |
422 | ||
e404e274 | 423 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
424 | { |
425 | struct serio *serio = to_serio_port(dev); | |
426 | return sprintf(buf, "%02x\n", serio->id.extra); | |
427 | } | |
428 | ||
baae9561 DT |
429 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
430 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
431 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
432 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
433 | ||
434 | static struct attribute *serio_device_id_attrs[] = { | |
435 | &dev_attr_type.attr, | |
436 | &dev_attr_proto.attr, | |
437 | &dev_attr_id.attr, | |
438 | &dev_attr_extra.attr, | |
439 | NULL | |
440 | }; | |
441 | ||
442 | static struct attribute_group serio_id_attr_group = { | |
443 | .name = "id", | |
444 | .attrs = serio_device_id_attrs, | |
445 | }; | |
446 | ||
e404e274 | 447 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
448 | { |
449 | struct serio *serio = to_serio_port(dev); | |
450 | struct device_driver *drv; | |
451 | int retval; | |
452 | ||
c4e32e9f | 453 | retval = mutex_lock_interruptible(&serio_mutex); |
1da177e4 LT |
454 | if (retval) |
455 | return retval; | |
456 | ||
457 | retval = count; | |
458 | if (!strncmp(buf, "none", count)) { | |
459 | serio_disconnect_port(serio); | |
460 | } else if (!strncmp(buf, "reconnect", count)) { | |
461 | serio_reconnect_port(serio); | |
462 | } else if (!strncmp(buf, "rescan", count)) { | |
463 | serio_disconnect_port(serio); | |
464 | serio_find_driver(serio); | |
465 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
466 | serio_disconnect_port(serio); | |
467 | serio_bind_driver(serio, to_serio_driver(drv)); | |
468 | put_driver(drv); | |
469 | } else { | |
470 | retval = -EINVAL; | |
471 | } | |
472 | ||
c4e32e9f | 473 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
474 | |
475 | return retval; | |
476 | } | |
477 | ||
e404e274 | 478 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
479 | { |
480 | struct serio *serio = to_serio_port(dev); | |
481 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
482 | } | |
483 | ||
e404e274 | 484 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
485 | { |
486 | struct serio *serio = to_serio_port(dev); | |
487 | int retval; | |
488 | ||
489 | retval = count; | |
490 | if (!strncmp(buf, "manual", count)) { | |
491 | serio->manual_bind = 1; | |
492 | } else if (!strncmp(buf, "auto", count)) { | |
493 | serio->manual_bind = 0; | |
494 | } else { | |
495 | retval = -EINVAL; | |
496 | } | |
497 | ||
498 | return retval; | |
499 | } | |
500 | ||
501 | static struct device_attribute serio_device_attrs[] = { | |
502 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 503 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
504 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
505 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
506 | __ATTR_NULL | |
507 | }; | |
508 | ||
509 | ||
510 | static void serio_release_port(struct device *dev) | |
511 | { | |
512 | struct serio *serio = to_serio_port(dev); | |
513 | ||
514 | kfree(serio); | |
515 | module_put(THIS_MODULE); | |
516 | } | |
517 | ||
518 | /* | |
519 | * Prepare serio port for registration. | |
520 | */ | |
521 | static void serio_init_port(struct serio *serio) | |
522 | { | |
523 | static atomic_t serio_no = ATOMIC_INIT(0); | |
524 | ||
525 | __module_get(THIS_MODULE); | |
526 | ||
527 | spin_lock_init(&serio->lock); | |
c4e32e9f | 528 | mutex_init(&serio->drv_mutex); |
1da177e4 LT |
529 | device_initialize(&serio->dev); |
530 | snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id), | |
531 | "serio%ld", (long)atomic_inc_return(&serio_no) - 1); | |
532 | serio->dev.bus = &serio_bus; | |
533 | serio->dev.release = serio_release_port; | |
534 | if (serio->parent) | |
535 | serio->dev.parent = &serio->parent->dev; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Complete serio port registration. | |
540 | * Driver core will attempt to find appropriate driver for the port. | |
541 | */ | |
542 | static void serio_add_port(struct serio *serio) | |
543 | { | |
544 | if (serio->parent) { | |
545 | serio_pause_rx(serio->parent); | |
546 | serio->parent->child = serio; | |
547 | serio_continue_rx(serio->parent); | |
548 | } | |
549 | ||
550 | list_add_tail(&serio->node, &serio_list); | |
551 | if (serio->start) | |
552 | serio->start(serio); | |
553 | device_add(&serio->dev); | |
baae9561 | 554 | sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group); |
1da177e4 LT |
555 | serio->registered = 1; |
556 | } | |
557 | ||
558 | /* | |
559 | * serio_destroy_port() completes deregistration process and removes | |
560 | * port from the system | |
561 | */ | |
562 | static void serio_destroy_port(struct serio *serio) | |
563 | { | |
564 | struct serio *child; | |
565 | ||
566 | child = serio_get_pending_child(serio); | |
567 | if (child) { | |
568 | serio_remove_pending_events(child); | |
569 | put_device(&child->dev); | |
570 | } | |
571 | ||
572 | if (serio->stop) | |
573 | serio->stop(serio); | |
574 | ||
575 | if (serio->parent) { | |
576 | serio_pause_rx(serio->parent); | |
577 | serio->parent->child = NULL; | |
578 | serio_continue_rx(serio->parent); | |
579 | serio->parent = NULL; | |
580 | } | |
581 | ||
582 | if (serio->registered) { | |
baae9561 | 583 | sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group); |
1da177e4 LT |
584 | device_del(&serio->dev); |
585 | list_del_init(&serio->node); | |
586 | serio->registered = 0; | |
587 | } | |
588 | ||
589 | serio_remove_pending_events(serio); | |
590 | put_device(&serio->dev); | |
591 | } | |
592 | ||
593 | /* | |
594 | * Reconnect serio port and all its children (re-initialize attached devices) | |
595 | */ | |
596 | static void serio_reconnect_port(struct serio *serio) | |
597 | { | |
598 | do { | |
3c803e8e | 599 | if (serio_reconnect_driver(serio)) { |
1da177e4 LT |
600 | serio_disconnect_port(serio); |
601 | serio_find_driver(serio); | |
602 | /* Ok, old children are now gone, we are done */ | |
603 | break; | |
604 | } | |
605 | serio = serio->child; | |
606 | } while (serio); | |
607 | } | |
608 | ||
609 | /* | |
610 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
611 | * all child ports are unbound and destroyed. | |
612 | */ | |
613 | static void serio_disconnect_port(struct serio *serio) | |
614 | { | |
615 | struct serio *s, *parent; | |
616 | ||
617 | if (serio->child) { | |
618 | /* | |
619 | * Children ports should be disconnected and destroyed | |
620 | * first, staring with the leaf one, since we don't want | |
621 | * to do recursion | |
622 | */ | |
623 | for (s = serio; s->child; s = s->child) | |
624 | /* empty */; | |
625 | ||
626 | do { | |
627 | parent = s->parent; | |
628 | ||
629 | serio_release_driver(s); | |
630 | serio_destroy_port(s); | |
631 | } while ((s = parent) != serio); | |
632 | } | |
633 | ||
634 | /* | |
635 | * Ok, no children left, now disconnect this port | |
636 | */ | |
637 | serio_release_driver(serio); | |
638 | } | |
639 | ||
640 | void serio_rescan(struct serio *serio) | |
641 | { | |
642 | serio_queue_event(serio, NULL, SERIO_RESCAN); | |
643 | } | |
644 | ||
645 | void serio_reconnect(struct serio *serio) | |
646 | { | |
647 | serio_queue_event(serio, NULL, SERIO_RECONNECT); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Submits register request to kseriod for subsequent execution. | |
652 | * Note that port registration is always asynchronous. | |
653 | */ | |
654 | void __serio_register_port(struct serio *serio, struct module *owner) | |
655 | { | |
656 | serio_init_port(serio); | |
657 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
658 | } | |
659 | ||
660 | /* | |
661 | * Synchronously unregisters serio port. | |
662 | */ | |
663 | void serio_unregister_port(struct serio *serio) | |
664 | { | |
c4e32e9f | 665 | mutex_lock(&serio_mutex); |
1da177e4 LT |
666 | serio_disconnect_port(serio); |
667 | serio_destroy_port(serio); | |
c4e32e9f | 668 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
669 | } |
670 | ||
3c803e8e LT |
671 | /* |
672 | * Safely unregisters child port if one is present. | |
673 | */ | |
674 | void serio_unregister_child_port(struct serio *serio) | |
675 | { | |
c4e32e9f | 676 | mutex_lock(&serio_mutex); |
3c803e8e LT |
677 | if (serio->child) { |
678 | serio_disconnect_port(serio->child); | |
679 | serio_destroy_port(serio->child); | |
680 | } | |
c4e32e9f | 681 | mutex_unlock(&serio_mutex); |
3c803e8e LT |
682 | } |
683 | ||
1da177e4 LT |
684 | /* |
685 | * Submits register request to kseriod for subsequent execution. | |
c4e32e9f | 686 | * Can be used when it is not obvious whether the serio_mutex is |
1da177e4 LT |
687 | * taken or not and when delayed execution is feasible. |
688 | */ | |
689 | void __serio_unregister_port_delayed(struct serio *serio, struct module *owner) | |
690 | { | |
691 | serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT); | |
692 | } | |
693 | ||
694 | ||
695 | /* | |
696 | * Serio driver operations | |
697 | */ | |
698 | ||
699 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
700 | { | |
701 | struct serio_driver *driver = to_serio_driver(drv); | |
702 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
703 | } | |
704 | ||
705 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
706 | { | |
707 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
708 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
709 | } | |
710 | ||
711 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
712 | { | |
713 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
714 | int retval; | |
715 | ||
716 | retval = count; | |
717 | if (!strncmp(buf, "manual", count)) { | |
718 | serio_drv->manual_bind = 1; | |
719 | } else if (!strncmp(buf, "auto", count)) { | |
720 | serio_drv->manual_bind = 0; | |
721 | } else { | |
722 | retval = -EINVAL; | |
723 | } | |
724 | ||
725 | return retval; | |
726 | } | |
727 | ||
728 | ||
729 | static struct driver_attribute serio_driver_attrs[] = { | |
730 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
731 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
732 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
733 | __ATTR_NULL | |
734 | }; | |
735 | ||
736 | static int serio_driver_probe(struct device *dev) | |
737 | { | |
738 | struct serio *serio = to_serio_port(dev); | |
739 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
740 | ||
3c803e8e | 741 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
742 | } |
743 | ||
744 | static int serio_driver_remove(struct device *dev) | |
745 | { | |
746 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 747 | |
3c803e8e | 748 | serio_disconnect_driver(serio); |
1da177e4 LT |
749 | return 0; |
750 | } | |
751 | ||
30226f81 RK |
752 | static struct bus_type serio_bus = { |
753 | .name = "serio", | |
754 | .probe = serio_driver_probe, | |
755 | .remove = serio_driver_remove, | |
756 | }; | |
757 | ||
1da177e4 LT |
758 | void __serio_register_driver(struct serio_driver *drv, struct module *owner) |
759 | { | |
760 | drv->driver.bus = &serio_bus; | |
1da177e4 LT |
761 | |
762 | serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER); | |
763 | } | |
764 | ||
765 | void serio_unregister_driver(struct serio_driver *drv) | |
766 | { | |
767 | struct serio *serio; | |
768 | ||
c4e32e9f | 769 | mutex_lock(&serio_mutex); |
1da177e4 LT |
770 | drv->manual_bind = 1; /* so serio_find_driver ignores it */ |
771 | ||
772 | start_over: | |
773 | list_for_each_entry(serio, &serio_list, node) { | |
774 | if (serio->drv == drv) { | |
775 | serio_disconnect_port(serio); | |
776 | serio_find_driver(serio); | |
777 | /* we could've deleted some ports, restart */ | |
778 | goto start_over; | |
779 | } | |
780 | } | |
781 | ||
782 | driver_unregister(&drv->driver); | |
c4e32e9f | 783 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
784 | } |
785 | ||
786 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
787 | { | |
1da177e4 LT |
788 | serio_pause_rx(serio); |
789 | serio->drv = drv; | |
790 | serio_continue_rx(serio); | |
1da177e4 LT |
791 | } |
792 | ||
793 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
794 | { | |
795 | struct serio *serio = to_serio_port(dev); | |
796 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
797 | ||
798 | if (serio->manual_bind || serio_drv->manual_bind) | |
799 | return 0; | |
800 | ||
801 | return serio_match_port(serio_drv->id_table, serio); | |
802 | } | |
803 | ||
804 | #ifdef CONFIG_HOTPLUG | |
805 | ||
312c004d | 806 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 807 | do { \ |
312c004d | 808 | int err = add_uevent_var(envp, num_envp, &i, \ |
ae87dff7 DT |
809 | buffer, buffer_size, &len, \ |
810 | fmt, val); \ | |
811 | if (err) \ | |
812 | return err; \ | |
813 | } while (0) | |
814 | ||
312c004d | 815 | static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
1da177e4 LT |
816 | { |
817 | struct serio *serio; | |
818 | int i = 0; | |
ae87dff7 | 819 | int len = 0; |
1da177e4 LT |
820 | |
821 | if (!dev) | |
822 | return -ENODEV; | |
823 | ||
824 | serio = to_serio_port(dev); | |
825 | ||
312c004d KS |
826 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
827 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
828 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
829 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
830 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
ae87dff7 | 831 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 LT |
832 | envp[i] = NULL; |
833 | ||
834 | return 0; | |
835 | } | |
312c004d | 836 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 LT |
837 | |
838 | #else | |
839 | ||
312c004d | 840 | static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
1da177e4 LT |
841 | { |
842 | return -ENODEV; | |
843 | } | |
844 | ||
845 | #endif /* CONFIG_HOTPLUG */ | |
846 | ||
847 | static int serio_resume(struct device *dev) | |
848 | { | |
849 | struct serio *serio = to_serio_port(dev); | |
850 | ||
3c803e8e | 851 | if (serio_reconnect_driver(serio)) { |
1da177e4 LT |
852 | /* |
853 | * Driver re-probing can take a while, so better let kseriod | |
854 | * deal with it. | |
855 | */ | |
856 | serio_rescan(serio); | |
857 | } | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
c4e32e9f | 862 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
863 | int serio_open(struct serio *serio, struct serio_driver *drv) |
864 | { | |
865 | serio_set_drv(serio, drv); | |
866 | ||
867 | if (serio->open && serio->open(serio)) { | |
868 | serio_set_drv(serio, NULL); | |
869 | return -1; | |
870 | } | |
871 | return 0; | |
872 | } | |
873 | ||
c4e32e9f | 874 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
875 | void serio_close(struct serio *serio) |
876 | { | |
877 | if (serio->close) | |
878 | serio->close(serio); | |
879 | ||
880 | serio_set_drv(serio, NULL); | |
881 | } | |
882 | ||
883 | irqreturn_t serio_interrupt(struct serio *serio, | |
884 | unsigned char data, unsigned int dfl, struct pt_regs *regs) | |
885 | { | |
886 | unsigned long flags; | |
887 | irqreturn_t ret = IRQ_NONE; | |
888 | ||
889 | spin_lock_irqsave(&serio->lock, flags); | |
890 | ||
891 | if (likely(serio->drv)) { | |
892 | ret = serio->drv->interrupt(serio, data, dfl, regs); | |
893 | } else if (!dfl && serio->registered) { | |
894 | serio_rescan(serio); | |
895 | ret = IRQ_HANDLED; | |
896 | } | |
897 | ||
898 | spin_unlock_irqrestore(&serio->lock, flags); | |
899 | ||
900 | return ret; | |
901 | } | |
902 | ||
903 | static int __init serio_init(void) | |
904 | { | |
3c803e8e LT |
905 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); |
906 | if (IS_ERR(serio_task)) { | |
1da177e4 | 907 | printk(KERN_ERR "serio: Failed to start kseriod\n"); |
3c803e8e | 908 | return PTR_ERR(serio_task); |
1da177e4 LT |
909 | } |
910 | ||
911 | serio_bus.dev_attrs = serio_device_attrs; | |
912 | serio_bus.drv_attrs = serio_driver_attrs; | |
913 | serio_bus.match = serio_bus_match; | |
312c004d | 914 | serio_bus.uevent = serio_uevent; |
1da177e4 LT |
915 | serio_bus.resume = serio_resume; |
916 | bus_register(&serio_bus); | |
917 | ||
918 | return 0; | |
919 | } | |
920 | ||
921 | static void __exit serio_exit(void) | |
922 | { | |
923 | bus_unregister(&serio_bus); | |
3c803e8e | 924 | kthread_stop(serio_task); |
1da177e4 LT |
925 | } |
926 | ||
927 | module_init(serio_init); | |
928 | module_exit(serio_exit); |