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