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> |
c4e32e9f | 37 | #include <linux/mutex.h> |
7dfb7103 | 38 | #include <linux/freezer.h> |
1da177e4 LT |
39 | |
40 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
41 | MODULE_DESCRIPTION("Serio abstraction core"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
44 | EXPORT_SYMBOL(serio_interrupt); | |
45 | EXPORT_SYMBOL(__serio_register_port); | |
46 | EXPORT_SYMBOL(serio_unregister_port); | |
3c803e8e | 47 | EXPORT_SYMBOL(serio_unregister_child_port); |
1da177e4 LT |
48 | EXPORT_SYMBOL(__serio_unregister_port_delayed); |
49 | EXPORT_SYMBOL(__serio_register_driver); | |
50 | EXPORT_SYMBOL(serio_unregister_driver); | |
51 | EXPORT_SYMBOL(serio_open); | |
52 | EXPORT_SYMBOL(serio_close); | |
53 | EXPORT_SYMBOL(serio_rescan); | |
54 | EXPORT_SYMBOL(serio_reconnect); | |
55 | ||
56 | /* | |
c4e32e9f | 57 | * serio_mutex protects entire serio subsystem and is taken every time |
1da177e4 LT |
58 | * serio port or driver registrered or unregistered. |
59 | */ | |
c4e32e9f | 60 | static DEFINE_MUTEX(serio_mutex); |
1da177e4 LT |
61 | |
62 | static LIST_HEAD(serio_list); | |
63 | ||
30226f81 | 64 | static struct bus_type serio_bus; |
1da177e4 | 65 | |
73b59a3b | 66 | static void serio_add_driver(struct serio_driver *drv); |
1da177e4 LT |
67 | static void serio_add_port(struct serio *serio); |
68 | static void serio_destroy_port(struct serio *serio); | |
69 | static void serio_reconnect_port(struct serio *serio); | |
70 | static void serio_disconnect_port(struct serio *serio); | |
71 | ||
3c803e8e LT |
72 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
73 | { | |
74 | int retval; | |
75 | ||
c4e32e9f | 76 | mutex_lock(&serio->drv_mutex); |
3c803e8e | 77 | retval = drv->connect(serio, drv); |
c4e32e9f | 78 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
79 | |
80 | return retval; | |
81 | } | |
82 | ||
83 | static int serio_reconnect_driver(struct serio *serio) | |
84 | { | |
85 | int retval = -1; | |
86 | ||
c4e32e9f | 87 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
88 | if (serio->drv && serio->drv->reconnect) |
89 | retval = serio->drv->reconnect(serio); | |
c4e32e9f | 90 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
91 | |
92 | return retval; | |
93 | } | |
94 | ||
95 | static void serio_disconnect_driver(struct serio *serio) | |
96 | { | |
c4e32e9f | 97 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
98 | if (serio->drv) |
99 | serio->drv->disconnect(serio); | |
c4e32e9f | 100 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
101 | } |
102 | ||
1da177e4 LT |
103 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
104 | { | |
105 | while (ids->type || ids->proto) { | |
106 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && | |
107 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && | |
108 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && | |
109 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) | |
110 | return 1; | |
111 | ids++; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Basic serio -> driver core mappings | |
118 | */ | |
119 | ||
120 | static void serio_bind_driver(struct serio *serio, struct serio_driver *drv) | |
121 | { | |
0a66045b DT |
122 | int error; |
123 | ||
1da177e4 LT |
124 | down_write(&serio_bus.subsys.rwsem); |
125 | ||
126 | if (serio_match_port(drv->id_table, serio)) { | |
127 | serio->dev.driver = &drv->driver; | |
3c803e8e | 128 | if (serio_connect_driver(serio, drv)) { |
1da177e4 LT |
129 | serio->dev.driver = NULL; |
130 | goto out; | |
131 | } | |
0a66045b DT |
132 | error = device_bind_driver(&serio->dev); |
133 | if (error) { | |
134 | printk(KERN_WARNING | |
135 | "serio: device_bind_driver() failed " | |
136 | "for %s (%s) and %s, error: %d\n", | |
137 | serio->phys, serio->name, | |
138 | drv->description, error); | |
139 | serio_disconnect_driver(serio); | |
140 | serio->dev.driver = NULL; | |
141 | goto out; | |
142 | } | |
1da177e4 | 143 | } |
0a66045b | 144 | out: |
1da177e4 LT |
145 | up_write(&serio_bus.subsys.rwsem); |
146 | } | |
147 | ||
148 | static void serio_release_driver(struct serio *serio) | |
149 | { | |
150 | down_write(&serio_bus.subsys.rwsem); | |
151 | device_release_driver(&serio->dev); | |
152 | up_write(&serio_bus.subsys.rwsem); | |
153 | } | |
154 | ||
155 | static void serio_find_driver(struct serio *serio) | |
156 | { | |
73b59a3b RD |
157 | int error; |
158 | ||
1da177e4 | 159 | down_write(&serio_bus.subsys.rwsem); |
73b59a3b RD |
160 | error = device_attach(&serio->dev); |
161 | if (error < 0) | |
162 | printk(KERN_WARNING | |
163 | "serio: device_attach() failed for %s (%s), error: %d\n", | |
164 | serio->phys, serio->name, error); | |
1da177e4 LT |
165 | up_write(&serio_bus.subsys.rwsem); |
166 | } | |
167 | ||
168 | ||
169 | /* | |
170 | * Serio event processing. | |
171 | */ | |
172 | ||
173 | enum serio_event_type { | |
174 | SERIO_RESCAN, | |
175 | SERIO_RECONNECT, | |
176 | SERIO_REGISTER_PORT, | |
177 | SERIO_UNREGISTER_PORT, | |
178 | SERIO_REGISTER_DRIVER, | |
179 | }; | |
180 | ||
181 | struct serio_event { | |
182 | enum serio_event_type type; | |
183 | void *object; | |
184 | struct module *owner; | |
185 | struct list_head node; | |
186 | }; | |
187 | ||
188 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
189 | static LIST_HEAD(serio_event_list); | |
190 | static DECLARE_WAIT_QUEUE_HEAD(serio_wait); | |
3c803e8e | 191 | static struct task_struct *serio_task; |
1da177e4 LT |
192 | |
193 | static void serio_queue_event(void *object, struct module *owner, | |
194 | enum serio_event_type event_type) | |
195 | { | |
196 | unsigned long flags; | |
197 | struct serio_event *event; | |
198 | ||
199 | spin_lock_irqsave(&serio_event_lock, flags); | |
200 | ||
201 | /* | |
3c803e8e | 202 | * Scan event list for the other events for the same serio port, |
1da177e4 LT |
203 | * starting with the most recent one. If event is the same we |
204 | * do not need add new one. If event is of different type we | |
205 | * need to add this event and should not look further because | |
206 | * we need to preseve sequence of distinct events. | |
3c803e8e | 207 | */ |
1da177e4 LT |
208 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
209 | if (event->object == object) { | |
210 | if (event->type == event_type) | |
211 | goto out; | |
212 | break; | |
213 | } | |
214 | } | |
215 | ||
216 | if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) { | |
217 | if (!try_module_get(owner)) { | |
218 | printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type); | |
9d921116 | 219 | kfree(event); |
1da177e4 LT |
220 | goto out; |
221 | } | |
222 | ||
223 | event->type = event_type; | |
224 | event->object = object; | |
225 | event->owner = owner; | |
226 | ||
227 | list_add_tail(&event->node, &serio_event_list); | |
228 | wake_up(&serio_wait); | |
229 | } else { | |
230 | printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type); | |
231 | } | |
232 | out: | |
233 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
234 | } | |
235 | ||
236 | static void serio_free_event(struct serio_event *event) | |
237 | { | |
238 | module_put(event->owner); | |
239 | kfree(event); | |
240 | } | |
241 | ||
242 | static void serio_remove_duplicate_events(struct serio_event *event) | |
243 | { | |
244 | struct list_head *node, *next; | |
245 | struct serio_event *e; | |
246 | unsigned long flags; | |
247 | ||
248 | spin_lock_irqsave(&serio_event_lock, flags); | |
249 | ||
250 | list_for_each_safe(node, next, &serio_event_list) { | |
251 | e = list_entry(node, struct serio_event, node); | |
252 | if (event->object == e->object) { | |
253 | /* | |
254 | * If this event is of different type we should not | |
255 | * look further - we only suppress duplicate events | |
256 | * that were sent back-to-back. | |
257 | */ | |
258 | if (event->type != e->type) | |
259 | break; | |
260 | ||
261 | list_del_init(node); | |
262 | serio_free_event(e); | |
263 | } | |
264 | } | |
265 | ||
266 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
267 | } | |
268 | ||
269 | ||
270 | static struct serio_event *serio_get_event(void) | |
271 | { | |
272 | struct serio_event *event; | |
273 | struct list_head *node; | |
274 | unsigned long flags; | |
275 | ||
276 | spin_lock_irqsave(&serio_event_lock, flags); | |
277 | ||
278 | if (list_empty(&serio_event_list)) { | |
279 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
280 | return NULL; | |
281 | } | |
282 | ||
283 | node = serio_event_list.next; | |
284 | event = list_entry(node, struct serio_event, node); | |
285 | list_del_init(node); | |
286 | ||
287 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
288 | ||
289 | return event; | |
290 | } | |
291 | ||
9e50afd0 | 292 | static void serio_handle_event(void) |
1da177e4 LT |
293 | { |
294 | struct serio_event *event; | |
1da177e4 | 295 | |
c4e32e9f | 296 | mutex_lock(&serio_mutex); |
1da177e4 | 297 | |
9e50afd0 DT |
298 | /* |
299 | * Note that we handle only one event here to give swsusp | |
300 | * a chance to freeze kseriod thread. Serio events should | |
301 | * be pretty rare so we are not concerned about taking | |
302 | * performance hit. | |
303 | */ | |
304 | if ((event = serio_get_event())) { | |
1da177e4 LT |
305 | |
306 | switch (event->type) { | |
307 | case SERIO_REGISTER_PORT: | |
308 | serio_add_port(event->object); | |
309 | break; | |
310 | ||
311 | case SERIO_UNREGISTER_PORT: | |
312 | serio_disconnect_port(event->object); | |
313 | serio_destroy_port(event->object); | |
314 | break; | |
315 | ||
316 | case SERIO_RECONNECT: | |
317 | serio_reconnect_port(event->object); | |
318 | break; | |
319 | ||
320 | case SERIO_RESCAN: | |
321 | serio_disconnect_port(event->object); | |
322 | serio_find_driver(event->object); | |
323 | break; | |
324 | ||
325 | case SERIO_REGISTER_DRIVER: | |
73b59a3b | 326 | serio_add_driver(event->object); |
1da177e4 LT |
327 | break; |
328 | ||
329 | default: | |
330 | break; | |
331 | } | |
332 | ||
333 | serio_remove_duplicate_events(event); | |
334 | serio_free_event(event); | |
335 | } | |
336 | ||
c4e32e9f | 337 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
338 | } |
339 | ||
340 | /* | |
341 | * Remove all events that have been submitted for a given serio port. | |
342 | */ | |
343 | static void serio_remove_pending_events(struct serio *serio) | |
344 | { | |
345 | struct list_head *node, *next; | |
346 | struct serio_event *event; | |
347 | unsigned long flags; | |
348 | ||
349 | spin_lock_irqsave(&serio_event_lock, flags); | |
350 | ||
351 | list_for_each_safe(node, next, &serio_event_list) { | |
352 | event = list_entry(node, struct serio_event, node); | |
353 | if (event->object == serio) { | |
354 | list_del_init(node); | |
355 | serio_free_event(event); | |
356 | } | |
357 | } | |
358 | ||
359 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
360 | } | |
361 | ||
362 | /* | |
363 | * Destroy child serio port (if any) that has not been fully registered yet. | |
364 | * | |
365 | * Note that we rely on the fact that port can have only one child and therefore | |
366 | * only one child registration request can be pending. Additionally, children | |
367 | * are registered by driver's connect() handler so there can't be a grandchild | |
368 | * pending registration together with a child. | |
369 | */ | |
370 | static struct serio *serio_get_pending_child(struct serio *parent) | |
371 | { | |
372 | struct serio_event *event; | |
373 | struct serio *serio, *child = NULL; | |
374 | unsigned long flags; | |
375 | ||
376 | spin_lock_irqsave(&serio_event_lock, flags); | |
377 | ||
378 | list_for_each_entry(event, &serio_event_list, node) { | |
379 | if (event->type == SERIO_REGISTER_PORT) { | |
380 | serio = event->object; | |
381 | if (serio->parent == parent) { | |
382 | child = serio; | |
383 | break; | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
389 | return child; | |
390 | } | |
391 | ||
392 | static int serio_thread(void *nothing) | |
393 | { | |
1da177e4 | 394 | do { |
9e50afd0 | 395 | serio_handle_event(); |
3c803e8e LT |
396 | wait_event_interruptible(serio_wait, |
397 | kthread_should_stop() || !list_empty(&serio_event_list)); | |
3e1d1d28 | 398 | try_to_freeze(); |
3c803e8e | 399 | } while (!kthread_should_stop()); |
1da177e4 LT |
400 | |
401 | printk(KERN_DEBUG "serio: kseriod exiting\n"); | |
3c803e8e | 402 | return 0; |
1da177e4 LT |
403 | } |
404 | ||
405 | ||
406 | /* | |
407 | * Serio port operations | |
408 | */ | |
409 | ||
e404e274 | 410 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
411 | { |
412 | struct serio *serio = to_serio_port(dev); | |
413 | return sprintf(buf, "%s\n", serio->name); | |
414 | } | |
415 | ||
ae87dff7 DT |
416 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
417 | { | |
418 | struct serio *serio = to_serio_port(dev); | |
419 | ||
420 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
421 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
422 | } | |
423 | ||
e404e274 | 424 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
425 | { |
426 | struct serio *serio = to_serio_port(dev); | |
427 | return sprintf(buf, "%02x\n", serio->id.type); | |
428 | } | |
429 | ||
e404e274 | 430 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
431 | { |
432 | struct serio *serio = to_serio_port(dev); | |
433 | return sprintf(buf, "%02x\n", serio->id.proto); | |
434 | } | |
435 | ||
e404e274 | 436 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
437 | { |
438 | struct serio *serio = to_serio_port(dev); | |
439 | return sprintf(buf, "%02x\n", serio->id.id); | |
440 | } | |
441 | ||
e404e274 | 442 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
443 | { |
444 | struct serio *serio = to_serio_port(dev); | |
445 | return sprintf(buf, "%02x\n", serio->id.extra); | |
446 | } | |
447 | ||
baae9561 DT |
448 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
449 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
450 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
451 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
452 | ||
453 | static struct attribute *serio_device_id_attrs[] = { | |
454 | &dev_attr_type.attr, | |
455 | &dev_attr_proto.attr, | |
456 | &dev_attr_id.attr, | |
457 | &dev_attr_extra.attr, | |
458 | NULL | |
459 | }; | |
460 | ||
461 | static struct attribute_group serio_id_attr_group = { | |
462 | .name = "id", | |
463 | .attrs = serio_device_id_attrs, | |
464 | }; | |
465 | ||
e404e274 | 466 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
467 | { |
468 | struct serio *serio = to_serio_port(dev); | |
469 | struct device_driver *drv; | |
470 | int retval; | |
471 | ||
c4e32e9f | 472 | retval = mutex_lock_interruptible(&serio_mutex); |
1da177e4 LT |
473 | if (retval) |
474 | return retval; | |
475 | ||
476 | retval = count; | |
477 | if (!strncmp(buf, "none", count)) { | |
478 | serio_disconnect_port(serio); | |
479 | } else if (!strncmp(buf, "reconnect", count)) { | |
480 | serio_reconnect_port(serio); | |
481 | } else if (!strncmp(buf, "rescan", count)) { | |
482 | serio_disconnect_port(serio); | |
483 | serio_find_driver(serio); | |
484 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
485 | serio_disconnect_port(serio); | |
486 | serio_bind_driver(serio, to_serio_driver(drv)); | |
487 | put_driver(drv); | |
488 | } else { | |
489 | retval = -EINVAL; | |
490 | } | |
491 | ||
c4e32e9f | 492 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
493 | |
494 | return retval; | |
495 | } | |
496 | ||
e404e274 | 497 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
498 | { |
499 | struct serio *serio = to_serio_port(dev); | |
500 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
501 | } | |
502 | ||
e404e274 | 503 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
504 | { |
505 | struct serio *serio = to_serio_port(dev); | |
506 | int retval; | |
507 | ||
508 | retval = count; | |
509 | if (!strncmp(buf, "manual", count)) { | |
510 | serio->manual_bind = 1; | |
511 | } else if (!strncmp(buf, "auto", count)) { | |
512 | serio->manual_bind = 0; | |
513 | } else { | |
514 | retval = -EINVAL; | |
515 | } | |
516 | ||
517 | return retval; | |
518 | } | |
519 | ||
520 | static struct device_attribute serio_device_attrs[] = { | |
521 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 522 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
523 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
524 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
525 | __ATTR_NULL | |
526 | }; | |
527 | ||
528 | ||
529 | static void serio_release_port(struct device *dev) | |
530 | { | |
531 | struct serio *serio = to_serio_port(dev); | |
532 | ||
533 | kfree(serio); | |
534 | module_put(THIS_MODULE); | |
535 | } | |
536 | ||
537 | /* | |
538 | * Prepare serio port for registration. | |
539 | */ | |
540 | static void serio_init_port(struct serio *serio) | |
541 | { | |
542 | static atomic_t serio_no = ATOMIC_INIT(0); | |
543 | ||
544 | __module_get(THIS_MODULE); | |
545 | ||
73b59a3b | 546 | INIT_LIST_HEAD(&serio->node); |
1da177e4 | 547 | spin_lock_init(&serio->lock); |
c4e32e9f | 548 | mutex_init(&serio->drv_mutex); |
1da177e4 LT |
549 | device_initialize(&serio->dev); |
550 | snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id), | |
551 | "serio%ld", (long)atomic_inc_return(&serio_no) - 1); | |
552 | serio->dev.bus = &serio_bus; | |
553 | serio->dev.release = serio_release_port; | |
88aa0103 | 554 | if (serio->parent) { |
1da177e4 | 555 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
556 | serio->depth = serio->parent->depth + 1; |
557 | } else | |
558 | serio->depth = 0; | |
559 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
560 | } |
561 | ||
562 | /* | |
563 | * Complete serio port registration. | |
564 | * Driver core will attempt to find appropriate driver for the port. | |
565 | */ | |
566 | static void serio_add_port(struct serio *serio) | |
567 | { | |
73b59a3b RD |
568 | int error; |
569 | ||
1da177e4 LT |
570 | if (serio->parent) { |
571 | serio_pause_rx(serio->parent); | |
572 | serio->parent->child = serio; | |
573 | serio_continue_rx(serio->parent); | |
574 | } | |
575 | ||
576 | list_add_tail(&serio->node, &serio_list); | |
577 | if (serio->start) | |
578 | serio->start(serio); | |
73b59a3b RD |
579 | error = device_add(&serio->dev); |
580 | if (error) | |
581 | printk(KERN_ERR | |
582 | "serio: device_add() failed for %s (%s), error: %d\n", | |
583 | serio->phys, serio->name, error); | |
584 | else { | |
585 | serio->registered = 1; | |
586 | error = sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group); | |
587 | if (error) | |
588 | printk(KERN_ERR | |
589 | "serio: sysfs_create_group() failed for %s (%s), error: %d\n", | |
590 | serio->phys, serio->name, error); | |
591 | } | |
1da177e4 LT |
592 | } |
593 | ||
594 | /* | |
595 | * serio_destroy_port() completes deregistration process and removes | |
596 | * port from the system | |
597 | */ | |
598 | static void serio_destroy_port(struct serio *serio) | |
599 | { | |
600 | struct serio *child; | |
601 | ||
602 | child = serio_get_pending_child(serio); | |
603 | if (child) { | |
604 | serio_remove_pending_events(child); | |
605 | put_device(&child->dev); | |
606 | } | |
607 | ||
608 | if (serio->stop) | |
609 | serio->stop(serio); | |
610 | ||
611 | if (serio->parent) { | |
612 | serio_pause_rx(serio->parent); | |
613 | serio->parent->child = NULL; | |
614 | serio_continue_rx(serio->parent); | |
615 | serio->parent = NULL; | |
616 | } | |
617 | ||
618 | if (serio->registered) { | |
baae9561 | 619 | sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group); |
1da177e4 | 620 | device_del(&serio->dev); |
1da177e4 LT |
621 | serio->registered = 0; |
622 | } | |
623 | ||
73b59a3b | 624 | list_del_init(&serio->node); |
1da177e4 LT |
625 | serio_remove_pending_events(serio); |
626 | put_device(&serio->dev); | |
627 | } | |
628 | ||
629 | /* | |
630 | * Reconnect serio port and all its children (re-initialize attached devices) | |
631 | */ | |
632 | static void serio_reconnect_port(struct serio *serio) | |
633 | { | |
634 | do { | |
3c803e8e | 635 | if (serio_reconnect_driver(serio)) { |
1da177e4 LT |
636 | serio_disconnect_port(serio); |
637 | serio_find_driver(serio); | |
638 | /* Ok, old children are now gone, we are done */ | |
639 | break; | |
640 | } | |
641 | serio = serio->child; | |
642 | } while (serio); | |
643 | } | |
644 | ||
645 | /* | |
646 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
647 | * all child ports are unbound and destroyed. | |
648 | */ | |
649 | static void serio_disconnect_port(struct serio *serio) | |
650 | { | |
651 | struct serio *s, *parent; | |
652 | ||
653 | if (serio->child) { | |
654 | /* | |
655 | * Children ports should be disconnected and destroyed | |
656 | * first, staring with the leaf one, since we don't want | |
657 | * to do recursion | |
658 | */ | |
659 | for (s = serio; s->child; s = s->child) | |
660 | /* empty */; | |
661 | ||
662 | do { | |
663 | parent = s->parent; | |
664 | ||
665 | serio_release_driver(s); | |
666 | serio_destroy_port(s); | |
667 | } while ((s = parent) != serio); | |
668 | } | |
669 | ||
670 | /* | |
671 | * Ok, no children left, now disconnect this port | |
672 | */ | |
673 | serio_release_driver(serio); | |
674 | } | |
675 | ||
676 | void serio_rescan(struct serio *serio) | |
677 | { | |
678 | serio_queue_event(serio, NULL, SERIO_RESCAN); | |
679 | } | |
680 | ||
681 | void serio_reconnect(struct serio *serio) | |
682 | { | |
683 | serio_queue_event(serio, NULL, SERIO_RECONNECT); | |
684 | } | |
685 | ||
686 | /* | |
687 | * Submits register request to kseriod for subsequent execution. | |
688 | * Note that port registration is always asynchronous. | |
689 | */ | |
690 | void __serio_register_port(struct serio *serio, struct module *owner) | |
691 | { | |
692 | serio_init_port(serio); | |
693 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
694 | } | |
695 | ||
696 | /* | |
697 | * Synchronously unregisters serio port. | |
698 | */ | |
699 | void serio_unregister_port(struct serio *serio) | |
700 | { | |
c4e32e9f | 701 | mutex_lock(&serio_mutex); |
1da177e4 LT |
702 | serio_disconnect_port(serio); |
703 | serio_destroy_port(serio); | |
c4e32e9f | 704 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
705 | } |
706 | ||
3c803e8e LT |
707 | /* |
708 | * Safely unregisters child port if one is present. | |
709 | */ | |
710 | void serio_unregister_child_port(struct serio *serio) | |
711 | { | |
c4e32e9f | 712 | mutex_lock(&serio_mutex); |
3c803e8e LT |
713 | if (serio->child) { |
714 | serio_disconnect_port(serio->child); | |
715 | serio_destroy_port(serio->child); | |
716 | } | |
c4e32e9f | 717 | mutex_unlock(&serio_mutex); |
3c803e8e LT |
718 | } |
719 | ||
1da177e4 LT |
720 | /* |
721 | * Submits register request to kseriod for subsequent execution. | |
c4e32e9f | 722 | * Can be used when it is not obvious whether the serio_mutex is |
1da177e4 LT |
723 | * taken or not and when delayed execution is feasible. |
724 | */ | |
725 | void __serio_unregister_port_delayed(struct serio *serio, struct module *owner) | |
726 | { | |
727 | serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT); | |
728 | } | |
729 | ||
730 | ||
731 | /* | |
732 | * Serio driver operations | |
733 | */ | |
734 | ||
735 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
736 | { | |
737 | struct serio_driver *driver = to_serio_driver(drv); | |
738 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
739 | } | |
740 | ||
741 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
742 | { | |
743 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
744 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
745 | } | |
746 | ||
747 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
748 | { | |
749 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
750 | int retval; | |
751 | ||
752 | retval = count; | |
753 | if (!strncmp(buf, "manual", count)) { | |
754 | serio_drv->manual_bind = 1; | |
755 | } else if (!strncmp(buf, "auto", count)) { | |
756 | serio_drv->manual_bind = 0; | |
757 | } else { | |
758 | retval = -EINVAL; | |
759 | } | |
760 | ||
761 | return retval; | |
762 | } | |
763 | ||
764 | ||
765 | static struct driver_attribute serio_driver_attrs[] = { | |
766 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
767 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
768 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
769 | __ATTR_NULL | |
770 | }; | |
771 | ||
772 | static int serio_driver_probe(struct device *dev) | |
773 | { | |
774 | struct serio *serio = to_serio_port(dev); | |
775 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
776 | ||
3c803e8e | 777 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
778 | } |
779 | ||
780 | static int serio_driver_remove(struct device *dev) | |
781 | { | |
782 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 783 | |
3c803e8e | 784 | serio_disconnect_driver(serio); |
1da177e4 LT |
785 | return 0; |
786 | } | |
787 | ||
30226f81 RK |
788 | static struct bus_type serio_bus = { |
789 | .name = "serio", | |
790 | .probe = serio_driver_probe, | |
791 | .remove = serio_driver_remove, | |
792 | }; | |
793 | ||
73b59a3b RD |
794 | static void serio_add_driver(struct serio_driver *drv) |
795 | { | |
796 | int error; | |
797 | ||
798 | error = driver_register(&drv->driver); | |
799 | if (error) | |
800 | printk(KERN_ERR | |
801 | "serio: driver_register() failed for %s, error: %d\n", | |
802 | drv->driver.name, error); | |
803 | } | |
804 | ||
1da177e4 LT |
805 | void __serio_register_driver(struct serio_driver *drv, struct module *owner) |
806 | { | |
807 | drv->driver.bus = &serio_bus; | |
1da177e4 LT |
808 | |
809 | serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER); | |
810 | } | |
811 | ||
812 | void serio_unregister_driver(struct serio_driver *drv) | |
813 | { | |
814 | struct serio *serio; | |
815 | ||
c4e32e9f | 816 | mutex_lock(&serio_mutex); |
1da177e4 LT |
817 | drv->manual_bind = 1; /* so serio_find_driver ignores it */ |
818 | ||
819 | start_over: | |
820 | list_for_each_entry(serio, &serio_list, node) { | |
821 | if (serio->drv == drv) { | |
822 | serio_disconnect_port(serio); | |
823 | serio_find_driver(serio); | |
824 | /* we could've deleted some ports, restart */ | |
825 | goto start_over; | |
826 | } | |
827 | } | |
828 | ||
829 | driver_unregister(&drv->driver); | |
c4e32e9f | 830 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
831 | } |
832 | ||
833 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
834 | { | |
1da177e4 LT |
835 | serio_pause_rx(serio); |
836 | serio->drv = drv; | |
837 | serio_continue_rx(serio); | |
1da177e4 LT |
838 | } |
839 | ||
840 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
841 | { | |
842 | struct serio *serio = to_serio_port(dev); | |
843 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
844 | ||
845 | if (serio->manual_bind || serio_drv->manual_bind) | |
846 | return 0; | |
847 | ||
848 | return serio_match_port(serio_drv->id_table, serio); | |
849 | } | |
850 | ||
851 | #ifdef CONFIG_HOTPLUG | |
852 | ||
312c004d | 853 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 854 | do { \ |
312c004d | 855 | int err = add_uevent_var(envp, num_envp, &i, \ |
ae87dff7 DT |
856 | buffer, buffer_size, &len, \ |
857 | fmt, val); \ | |
858 | if (err) \ | |
859 | return err; \ | |
860 | } while (0) | |
861 | ||
312c004d | 862 | static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
1da177e4 LT |
863 | { |
864 | struct serio *serio; | |
865 | int i = 0; | |
ae87dff7 | 866 | int len = 0; |
1da177e4 LT |
867 | |
868 | if (!dev) | |
869 | return -ENODEV; | |
870 | ||
871 | serio = to_serio_port(dev); | |
872 | ||
312c004d KS |
873 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
874 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
875 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
876 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
877 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
ae87dff7 | 878 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 LT |
879 | envp[i] = NULL; |
880 | ||
881 | return 0; | |
882 | } | |
312c004d | 883 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 LT |
884 | |
885 | #else | |
886 | ||
312c004d | 887 | static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) |
1da177e4 LT |
888 | { |
889 | return -ENODEV; | |
890 | } | |
891 | ||
892 | #endif /* CONFIG_HOTPLUG */ | |
893 | ||
894 | static int serio_resume(struct device *dev) | |
895 | { | |
896 | struct serio *serio = to_serio_port(dev); | |
897 | ||
3c803e8e | 898 | if (serio_reconnect_driver(serio)) { |
1da177e4 LT |
899 | /* |
900 | * Driver re-probing can take a while, so better let kseriod | |
901 | * deal with it. | |
902 | */ | |
903 | serio_rescan(serio); | |
904 | } | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
c4e32e9f | 909 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
910 | int serio_open(struct serio *serio, struct serio_driver *drv) |
911 | { | |
912 | serio_set_drv(serio, drv); | |
913 | ||
914 | if (serio->open && serio->open(serio)) { | |
915 | serio_set_drv(serio, NULL); | |
916 | return -1; | |
917 | } | |
918 | return 0; | |
919 | } | |
920 | ||
c4e32e9f | 921 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
922 | void serio_close(struct serio *serio) |
923 | { | |
924 | if (serio->close) | |
925 | serio->close(serio); | |
926 | ||
927 | serio_set_drv(serio, NULL); | |
928 | } | |
929 | ||
930 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 931 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
932 | { |
933 | unsigned long flags; | |
934 | irqreturn_t ret = IRQ_NONE; | |
935 | ||
936 | spin_lock_irqsave(&serio->lock, flags); | |
937 | ||
938 | if (likely(serio->drv)) { | |
7d12e780 | 939 | ret = serio->drv->interrupt(serio, data, dfl); |
1da177e4 LT |
940 | } else if (!dfl && serio->registered) { |
941 | serio_rescan(serio); | |
942 | ret = IRQ_HANDLED; | |
943 | } | |
944 | ||
945 | spin_unlock_irqrestore(&serio->lock, flags); | |
946 | ||
947 | return ret; | |
948 | } | |
949 | ||
950 | static int __init serio_init(void) | |
951 | { | |
73b59a3b | 952 | int error; |
1da177e4 LT |
953 | |
954 | serio_bus.dev_attrs = serio_device_attrs; | |
955 | serio_bus.drv_attrs = serio_driver_attrs; | |
956 | serio_bus.match = serio_bus_match; | |
312c004d | 957 | serio_bus.uevent = serio_uevent; |
1da177e4 | 958 | serio_bus.resume = serio_resume; |
73b59a3b RD |
959 | error = bus_register(&serio_bus); |
960 | if (error) { | |
961 | printk(KERN_ERR "serio: failed to register serio bus, error: %d\n", error); | |
962 | return error; | |
963 | } | |
964 | ||
965 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); | |
966 | if (IS_ERR(serio_task)) { | |
967 | bus_unregister(&serio_bus); | |
968 | error = PTR_ERR(serio_task); | |
969 | printk(KERN_ERR "serio: Failed to start kseriod, error: %d\n", error); | |
970 | return error; | |
971 | } | |
1da177e4 LT |
972 | |
973 | return 0; | |
974 | } | |
975 | ||
976 | static void __exit serio_exit(void) | |
977 | { | |
978 | bus_unregister(&serio_bus); | |
3c803e8e | 979 | kthread_stop(serio_task); |
1da177e4 LT |
980 | } |
981 | ||
51c38f9b | 982 | subsys_initcall(serio_init); |
1da177e4 | 983 | module_exit(serio_exit); |