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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 | ||
1da177e4 | 44 | /* |
c4e32e9f | 45 | * serio_mutex protects entire serio subsystem and is taken every time |
1da177e4 LT |
46 | * serio port or driver registrered or unregistered. |
47 | */ | |
c4e32e9f | 48 | static DEFINE_MUTEX(serio_mutex); |
1da177e4 LT |
49 | |
50 | static LIST_HEAD(serio_list); | |
51 | ||
30226f81 | 52 | static struct bus_type serio_bus; |
1da177e4 LT |
53 | |
54 | static void serio_add_port(struct serio *serio); | |
6aabcdff | 55 | static int serio_reconnect_port(struct serio *serio); |
1da177e4 | 56 | static void serio_disconnect_port(struct serio *serio); |
6aabcdff | 57 | static void serio_reconnect_chain(struct serio *serio); |
ed7b1f6d | 58 | static void serio_attach_driver(struct serio_driver *drv); |
1da177e4 | 59 | |
3c803e8e LT |
60 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
61 | { | |
62 | int retval; | |
63 | ||
c4e32e9f | 64 | mutex_lock(&serio->drv_mutex); |
3c803e8e | 65 | retval = drv->connect(serio, drv); |
c4e32e9f | 66 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
67 | |
68 | return retval; | |
69 | } | |
70 | ||
71 | static int serio_reconnect_driver(struct serio *serio) | |
72 | { | |
73 | int retval = -1; | |
74 | ||
c4e32e9f | 75 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
76 | if (serio->drv && serio->drv->reconnect) |
77 | retval = serio->drv->reconnect(serio); | |
c4e32e9f | 78 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
79 | |
80 | return retval; | |
81 | } | |
82 | ||
83 | static void serio_disconnect_driver(struct serio *serio) | |
84 | { | |
c4e32e9f | 85 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
86 | if (serio->drv) |
87 | serio->drv->disconnect(serio); | |
c4e32e9f | 88 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
89 | } |
90 | ||
1da177e4 LT |
91 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
92 | { | |
93 | while (ids->type || ids->proto) { | |
94 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && | |
95 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && | |
96 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && | |
97 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) | |
98 | return 1; | |
99 | ids++; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Basic serio -> driver core mappings | |
106 | */ | |
107 | ||
70f256fd | 108 | static int serio_bind_driver(struct serio *serio, struct serio_driver *drv) |
1da177e4 | 109 | { |
0a66045b DT |
110 | int error; |
111 | ||
1da177e4 | 112 | if (serio_match_port(drv->id_table, serio)) { |
70f256fd | 113 | |
1da177e4 | 114 | serio->dev.driver = &drv->driver; |
3c803e8e | 115 | if (serio_connect_driver(serio, drv)) { |
1da177e4 | 116 | serio->dev.driver = NULL; |
70f256fd | 117 | return -ENODEV; |
1da177e4 | 118 | } |
70f256fd | 119 | |
0a66045b DT |
120 | error = device_bind_driver(&serio->dev); |
121 | if (error) { | |
122 | printk(KERN_WARNING | |
123 | "serio: device_bind_driver() failed " | |
124 | "for %s (%s) and %s, error: %d\n", | |
125 | serio->phys, serio->name, | |
126 | drv->description, error); | |
127 | serio_disconnect_driver(serio); | |
128 | serio->dev.driver = NULL; | |
70f256fd | 129 | return error; |
0a66045b | 130 | } |
1da177e4 | 131 | } |
70f256fd | 132 | return 0; |
1da177e4 LT |
133 | } |
134 | ||
135 | static void serio_find_driver(struct serio *serio) | |
136 | { | |
73b59a3b RD |
137 | int error; |
138 | ||
73b59a3b RD |
139 | error = device_attach(&serio->dev); |
140 | if (error < 0) | |
141 | printk(KERN_WARNING | |
142 | "serio: device_attach() failed for %s (%s), error: %d\n", | |
143 | serio->phys, serio->name, error); | |
1da177e4 LT |
144 | } |
145 | ||
146 | ||
147 | /* | |
148 | * Serio event processing. | |
149 | */ | |
150 | ||
151 | enum serio_event_type { | |
ed7b1f6d DT |
152 | SERIO_RESCAN_PORT, |
153 | SERIO_RECONNECT_PORT, | |
6aabcdff | 154 | SERIO_RECONNECT_CHAIN, |
1da177e4 | 155 | SERIO_REGISTER_PORT, |
ed7b1f6d | 156 | SERIO_ATTACH_DRIVER, |
1da177e4 LT |
157 | }; |
158 | ||
159 | struct serio_event { | |
160 | enum serio_event_type type; | |
161 | void *object; | |
162 | struct module *owner; | |
163 | struct list_head node; | |
164 | }; | |
165 | ||
166 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
167 | static LIST_HEAD(serio_event_list); | |
168 | static DECLARE_WAIT_QUEUE_HEAD(serio_wait); | |
3c803e8e | 169 | static struct task_struct *serio_task; |
1da177e4 | 170 | |
ed7b1f6d DT |
171 | static int serio_queue_event(void *object, struct module *owner, |
172 | enum serio_event_type event_type) | |
1da177e4 LT |
173 | { |
174 | unsigned long flags; | |
175 | struct serio_event *event; | |
ed7b1f6d | 176 | int retval = 0; |
1da177e4 LT |
177 | |
178 | spin_lock_irqsave(&serio_event_lock, flags); | |
179 | ||
180 | /* | |
3c803e8e | 181 | * Scan event list for the other events for the same serio port, |
1da177e4 LT |
182 | * starting with the most recent one. If event is the same we |
183 | * do not need add new one. If event is of different type we | |
184 | * need to add this event and should not look further because | |
185 | * we need to preseve sequence of distinct events. | |
3c803e8e | 186 | */ |
1da177e4 LT |
187 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
188 | if (event->object == object) { | |
189 | if (event->type == event_type) | |
190 | goto out; | |
191 | break; | |
192 | } | |
193 | } | |
194 | ||
ed7b1f6d DT |
195 | event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); |
196 | if (!event) { | |
197 | printk(KERN_ERR | |
198 | "serio: Not enough memory to queue event %d\n", | |
199 | event_type); | |
200 | retval = -ENOMEM; | |
201 | goto out; | |
202 | } | |
1da177e4 | 203 | |
ed7b1f6d DT |
204 | if (!try_module_get(owner)) { |
205 | printk(KERN_WARNING | |
206 | "serio: Can't get module reference, dropping event %d\n", | |
207 | event_type); | |
208 | kfree(event); | |
209 | retval = -EINVAL; | |
210 | goto out; | |
1da177e4 | 211 | } |
ed7b1f6d DT |
212 | |
213 | event->type = event_type; | |
214 | event->object = object; | |
215 | event->owner = owner; | |
216 | ||
217 | list_add_tail(&event->node, &serio_event_list); | |
218 | wake_up(&serio_wait); | |
219 | ||
1da177e4 LT |
220 | out: |
221 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
ed7b1f6d | 222 | return retval; |
1da177e4 LT |
223 | } |
224 | ||
225 | static void serio_free_event(struct serio_event *event) | |
226 | { | |
227 | module_put(event->owner); | |
228 | kfree(event); | |
229 | } | |
230 | ||
231 | static void serio_remove_duplicate_events(struct serio_event *event) | |
232 | { | |
233 | struct list_head *node, *next; | |
234 | struct serio_event *e; | |
235 | unsigned long flags; | |
236 | ||
237 | spin_lock_irqsave(&serio_event_lock, flags); | |
238 | ||
239 | list_for_each_safe(node, next, &serio_event_list) { | |
240 | e = list_entry(node, struct serio_event, node); | |
241 | if (event->object == e->object) { | |
242 | /* | |
243 | * If this event is of different type we should not | |
244 | * look further - we only suppress duplicate events | |
245 | * that were sent back-to-back. | |
246 | */ | |
247 | if (event->type != e->type) | |
248 | break; | |
249 | ||
250 | list_del_init(node); | |
251 | serio_free_event(e); | |
252 | } | |
253 | } | |
254 | ||
255 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
256 | } | |
257 | ||
258 | ||
259 | static struct serio_event *serio_get_event(void) | |
260 | { | |
261 | struct serio_event *event; | |
262 | struct list_head *node; | |
263 | unsigned long flags; | |
264 | ||
265 | spin_lock_irqsave(&serio_event_lock, flags); | |
266 | ||
267 | if (list_empty(&serio_event_list)) { | |
268 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
269 | return NULL; | |
270 | } | |
271 | ||
272 | node = serio_event_list.next; | |
273 | event = list_entry(node, struct serio_event, node); | |
274 | list_del_init(node); | |
275 | ||
276 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
277 | ||
278 | return event; | |
279 | } | |
280 | ||
9e50afd0 | 281 | static void serio_handle_event(void) |
1da177e4 LT |
282 | { |
283 | struct serio_event *event; | |
1da177e4 | 284 | |
c4e32e9f | 285 | mutex_lock(&serio_mutex); |
1da177e4 | 286 | |
9e50afd0 DT |
287 | /* |
288 | * Note that we handle only one event here to give swsusp | |
289 | * a chance to freeze kseriod thread. Serio events should | |
290 | * be pretty rare so we are not concerned about taking | |
291 | * performance hit. | |
292 | */ | |
293 | if ((event = serio_get_event())) { | |
1da177e4 LT |
294 | |
295 | switch (event->type) { | |
296 | case SERIO_REGISTER_PORT: | |
297 | serio_add_port(event->object); | |
298 | break; | |
299 | ||
ed7b1f6d | 300 | case SERIO_RECONNECT_PORT: |
1da177e4 LT |
301 | serio_reconnect_port(event->object); |
302 | break; | |
303 | ||
ed7b1f6d | 304 | case SERIO_RESCAN_PORT: |
1da177e4 LT |
305 | serio_disconnect_port(event->object); |
306 | serio_find_driver(event->object); | |
307 | break; | |
308 | ||
6aabcdff SL |
309 | case SERIO_RECONNECT_CHAIN: |
310 | serio_reconnect_chain(event->object); | |
311 | break; | |
312 | ||
ed7b1f6d DT |
313 | case SERIO_ATTACH_DRIVER: |
314 | serio_attach_driver(event->object); | |
1da177e4 LT |
315 | break; |
316 | ||
317 | default: | |
318 | break; | |
319 | } | |
320 | ||
321 | serio_remove_duplicate_events(event); | |
322 | serio_free_event(event); | |
323 | } | |
324 | ||
c4e32e9f | 325 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
326 | } |
327 | ||
328 | /* | |
e8ef4347 DT |
329 | * Remove all events that have been submitted for a given |
330 | * object, be it serio port or driver. | |
1da177e4 | 331 | */ |
e8ef4347 | 332 | static void serio_remove_pending_events(void *object) |
1da177e4 LT |
333 | { |
334 | struct list_head *node, *next; | |
335 | struct serio_event *event; | |
336 | unsigned long flags; | |
337 | ||
338 | spin_lock_irqsave(&serio_event_lock, flags); | |
339 | ||
340 | list_for_each_safe(node, next, &serio_event_list) { | |
341 | event = list_entry(node, struct serio_event, node); | |
e8ef4347 | 342 | if (event->object == object) { |
1da177e4 LT |
343 | list_del_init(node); |
344 | serio_free_event(event); | |
345 | } | |
346 | } | |
347 | ||
348 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
349 | } | |
350 | ||
351 | /* | |
352 | * Destroy child serio port (if any) that has not been fully registered yet. | |
353 | * | |
354 | * Note that we rely on the fact that port can have only one child and therefore | |
355 | * only one child registration request can be pending. Additionally, children | |
356 | * are registered by driver's connect() handler so there can't be a grandchild | |
357 | * pending registration together with a child. | |
358 | */ | |
359 | static struct serio *serio_get_pending_child(struct serio *parent) | |
360 | { | |
361 | struct serio_event *event; | |
362 | struct serio *serio, *child = NULL; | |
363 | unsigned long flags; | |
364 | ||
365 | spin_lock_irqsave(&serio_event_lock, flags); | |
366 | ||
367 | list_for_each_entry(event, &serio_event_list, node) { | |
368 | if (event->type == SERIO_REGISTER_PORT) { | |
369 | serio = event->object; | |
370 | if (serio->parent == parent) { | |
371 | child = serio; | |
372 | break; | |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
378 | return child; | |
379 | } | |
380 | ||
381 | static int serio_thread(void *nothing) | |
382 | { | |
83144186 | 383 | set_freezable(); |
1da177e4 | 384 | do { |
9e50afd0 | 385 | serio_handle_event(); |
e42837bc | 386 | wait_event_freezable(serio_wait, |
3c803e8e | 387 | kthread_should_stop() || !list_empty(&serio_event_list)); |
3c803e8e | 388 | } while (!kthread_should_stop()); |
1da177e4 LT |
389 | |
390 | printk(KERN_DEBUG "serio: kseriod exiting\n"); | |
3c803e8e | 391 | return 0; |
1da177e4 LT |
392 | } |
393 | ||
394 | ||
395 | /* | |
396 | * Serio port operations | |
397 | */ | |
398 | ||
e404e274 | 399 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
400 | { |
401 | struct serio *serio = to_serio_port(dev); | |
402 | return sprintf(buf, "%s\n", serio->name); | |
403 | } | |
404 | ||
ae87dff7 DT |
405 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
406 | { | |
407 | struct serio *serio = to_serio_port(dev); | |
408 | ||
409 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
410 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
411 | } | |
412 | ||
e404e274 | 413 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
414 | { |
415 | struct serio *serio = to_serio_port(dev); | |
416 | return sprintf(buf, "%02x\n", serio->id.type); | |
417 | } | |
418 | ||
e404e274 | 419 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
420 | { |
421 | struct serio *serio = to_serio_port(dev); | |
422 | return sprintf(buf, "%02x\n", serio->id.proto); | |
423 | } | |
424 | ||
e404e274 | 425 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
426 | { |
427 | struct serio *serio = to_serio_port(dev); | |
428 | return sprintf(buf, "%02x\n", serio->id.id); | |
429 | } | |
430 | ||
e404e274 | 431 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
432 | { |
433 | struct serio *serio = to_serio_port(dev); | |
434 | return sprintf(buf, "%02x\n", serio->id.extra); | |
435 | } | |
436 | ||
baae9561 DT |
437 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
438 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
439 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
440 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
441 | ||
442 | static struct attribute *serio_device_id_attrs[] = { | |
443 | &dev_attr_type.attr, | |
444 | &dev_attr_proto.attr, | |
445 | &dev_attr_id.attr, | |
446 | &dev_attr_extra.attr, | |
447 | NULL | |
448 | }; | |
449 | ||
450 | static struct attribute_group serio_id_attr_group = { | |
451 | .name = "id", | |
452 | .attrs = serio_device_id_attrs, | |
453 | }; | |
454 | ||
386d8772 DT |
455 | static const struct attribute_group *serio_device_attr_groups[] = { |
456 | &serio_id_attr_group, | |
457 | NULL | |
458 | }; | |
459 | ||
e404e274 | 460 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
461 | { |
462 | struct serio *serio = to_serio_port(dev); | |
463 | struct device_driver *drv; | |
70f256fd | 464 | int error; |
1da177e4 | 465 | |
70f256fd DT |
466 | error = mutex_lock_interruptible(&serio_mutex); |
467 | if (error) | |
468 | return error; | |
1da177e4 | 469 | |
1da177e4 LT |
470 | if (!strncmp(buf, "none", count)) { |
471 | serio_disconnect_port(serio); | |
472 | } else if (!strncmp(buf, "reconnect", count)) { | |
6aabcdff | 473 | serio_reconnect_chain(serio); |
1da177e4 LT |
474 | } else if (!strncmp(buf, "rescan", count)) { |
475 | serio_disconnect_port(serio); | |
476 | serio_find_driver(serio); | |
477 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
478 | serio_disconnect_port(serio); | |
70f256fd | 479 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
1da177e4 LT |
480 | put_driver(drv); |
481 | } else { | |
70f256fd | 482 | error = -EINVAL; |
1da177e4 LT |
483 | } |
484 | ||
c4e32e9f | 485 | mutex_unlock(&serio_mutex); |
1da177e4 | 486 | |
70f256fd | 487 | return error ? error : count; |
1da177e4 LT |
488 | } |
489 | ||
e404e274 | 490 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
491 | { |
492 | struct serio *serio = to_serio_port(dev); | |
493 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
494 | } | |
495 | ||
e404e274 | 496 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
497 | { |
498 | struct serio *serio = to_serio_port(dev); | |
499 | int retval; | |
500 | ||
501 | retval = count; | |
502 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 503 | serio->manual_bind = true; |
1da177e4 | 504 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 505 | serio->manual_bind = false; |
1da177e4 LT |
506 | } else { |
507 | retval = -EINVAL; | |
508 | } | |
509 | ||
510 | return retval; | |
511 | } | |
512 | ||
513 | static struct device_attribute serio_device_attrs[] = { | |
514 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 515 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
516 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
517 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
518 | __ATTR_NULL | |
519 | }; | |
520 | ||
521 | ||
522 | static void serio_release_port(struct device *dev) | |
523 | { | |
524 | struct serio *serio = to_serio_port(dev); | |
525 | ||
526 | kfree(serio); | |
527 | module_put(THIS_MODULE); | |
528 | } | |
529 | ||
530 | /* | |
531 | * Prepare serio port for registration. | |
532 | */ | |
533 | static void serio_init_port(struct serio *serio) | |
534 | { | |
535 | static atomic_t serio_no = ATOMIC_INIT(0); | |
536 | ||
537 | __module_get(THIS_MODULE); | |
538 | ||
73b59a3b | 539 | INIT_LIST_HEAD(&serio->node); |
1da177e4 | 540 | spin_lock_init(&serio->lock); |
c4e32e9f | 541 | mutex_init(&serio->drv_mutex); |
1da177e4 | 542 | device_initialize(&serio->dev); |
a6c2490f KS |
543 | dev_set_name(&serio->dev, "serio%ld", |
544 | (long)atomic_inc_return(&serio_no) - 1); | |
1da177e4 LT |
545 | serio->dev.bus = &serio_bus; |
546 | serio->dev.release = serio_release_port; | |
386d8772 | 547 | serio->dev.groups = serio_device_attr_groups; |
88aa0103 | 548 | if (serio->parent) { |
1da177e4 | 549 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
550 | serio->depth = serio->parent->depth + 1; |
551 | } else | |
552 | serio->depth = 0; | |
553 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
554 | } |
555 | ||
556 | /* | |
557 | * Complete serio port registration. | |
558 | * Driver core will attempt to find appropriate driver for the port. | |
559 | */ | |
560 | static void serio_add_port(struct serio *serio) | |
561 | { | |
73b59a3b RD |
562 | int error; |
563 | ||
1da177e4 LT |
564 | if (serio->parent) { |
565 | serio_pause_rx(serio->parent); | |
566 | serio->parent->child = serio; | |
567 | serio_continue_rx(serio->parent); | |
568 | } | |
569 | ||
570 | list_add_tail(&serio->node, &serio_list); | |
386d8772 | 571 | |
1da177e4 LT |
572 | if (serio->start) |
573 | serio->start(serio); | |
386d8772 | 574 | |
73b59a3b RD |
575 | error = device_add(&serio->dev); |
576 | if (error) | |
577 | printk(KERN_ERR | |
578 | "serio: device_add() failed for %s (%s), error: %d\n", | |
579 | serio->phys, serio->name, error); | |
1da177e4 LT |
580 | } |
581 | ||
582 | /* | |
583 | * serio_destroy_port() completes deregistration process and removes | |
584 | * port from the system | |
585 | */ | |
586 | static void serio_destroy_port(struct serio *serio) | |
587 | { | |
588 | struct serio *child; | |
589 | ||
590 | child = serio_get_pending_child(serio); | |
591 | if (child) { | |
592 | serio_remove_pending_events(child); | |
593 | put_device(&child->dev); | |
594 | } | |
595 | ||
596 | if (serio->stop) | |
597 | serio->stop(serio); | |
598 | ||
599 | if (serio->parent) { | |
600 | serio_pause_rx(serio->parent); | |
601 | serio->parent->child = NULL; | |
602 | serio_continue_rx(serio->parent); | |
603 | serio->parent = NULL; | |
604 | } | |
605 | ||
ddf1ffbd | 606 | if (device_is_registered(&serio->dev)) |
1da177e4 | 607 | device_del(&serio->dev); |
1da177e4 | 608 | |
73b59a3b | 609 | list_del_init(&serio->node); |
1da177e4 LT |
610 | serio_remove_pending_events(serio); |
611 | put_device(&serio->dev); | |
612 | } | |
613 | ||
6aabcdff SL |
614 | /* |
615 | * Reconnect serio port (re-initialize attached device). | |
616 | * If reconnect fails (old device is no longer attached or | |
617 | * there was no device to begin with) we do full rescan in | |
618 | * hope of finding a driver for the port. | |
619 | */ | |
620 | static int serio_reconnect_port(struct serio *serio) | |
621 | { | |
622 | int error = serio_reconnect_driver(serio); | |
623 | ||
624 | if (error) { | |
625 | serio_disconnect_port(serio); | |
626 | serio_find_driver(serio); | |
627 | } | |
628 | ||
629 | return error; | |
630 | } | |
631 | ||
1da177e4 LT |
632 | /* |
633 | * Reconnect serio port and all its children (re-initialize attached devices) | |
634 | */ | |
6aabcdff | 635 | static void serio_reconnect_chain(struct serio *serio) |
1da177e4 LT |
636 | { |
637 | do { | |
6aabcdff | 638 | if (serio_reconnect_port(serio)) { |
1da177e4 LT |
639 | /* Ok, old children are now gone, we are done */ |
640 | break; | |
641 | } | |
642 | serio = serio->child; | |
643 | } while (serio); | |
644 | } | |
645 | ||
646 | /* | |
647 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
648 | * all child ports are unbound and destroyed. | |
649 | */ | |
650 | static void serio_disconnect_port(struct serio *serio) | |
651 | { | |
652 | struct serio *s, *parent; | |
653 | ||
654 | if (serio->child) { | |
655 | /* | |
656 | * Children ports should be disconnected and destroyed | |
657 | * first, staring with the leaf one, since we don't want | |
658 | * to do recursion | |
659 | */ | |
660 | for (s = serio; s->child; s = s->child) | |
661 | /* empty */; | |
662 | ||
663 | do { | |
664 | parent = s->parent; | |
665 | ||
70f256fd | 666 | device_release_driver(&s->dev); |
1da177e4 LT |
667 | serio_destroy_port(s); |
668 | } while ((s = parent) != serio); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Ok, no children left, now disconnect this port | |
673 | */ | |
70f256fd | 674 | device_release_driver(&serio->dev); |
1da177e4 LT |
675 | } |
676 | ||
677 | void serio_rescan(struct serio *serio) | |
678 | { | |
ed7b1f6d | 679 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
1da177e4 | 680 | } |
89b09b99 | 681 | EXPORT_SYMBOL(serio_rescan); |
1da177e4 LT |
682 | |
683 | void serio_reconnect(struct serio *serio) | |
684 | { | |
6aabcdff | 685 | serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN); |
1da177e4 | 686 | } |
89b09b99 | 687 | EXPORT_SYMBOL(serio_reconnect); |
1da177e4 LT |
688 | |
689 | /* | |
690 | * Submits register request to kseriod for subsequent execution. | |
691 | * Note that port registration is always asynchronous. | |
692 | */ | |
693 | void __serio_register_port(struct serio *serio, struct module *owner) | |
694 | { | |
695 | serio_init_port(serio); | |
696 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
697 | } | |
89b09b99 | 698 | EXPORT_SYMBOL(__serio_register_port); |
1da177e4 LT |
699 | |
700 | /* | |
701 | * Synchronously unregisters serio port. | |
702 | */ | |
703 | void serio_unregister_port(struct serio *serio) | |
704 | { | |
c4e32e9f | 705 | mutex_lock(&serio_mutex); |
1da177e4 LT |
706 | serio_disconnect_port(serio); |
707 | serio_destroy_port(serio); | |
c4e32e9f | 708 | mutex_unlock(&serio_mutex); |
1da177e4 | 709 | } |
89b09b99 | 710 | EXPORT_SYMBOL(serio_unregister_port); |
1da177e4 | 711 | |
3c803e8e LT |
712 | /* |
713 | * Safely unregisters child port if one is present. | |
714 | */ | |
715 | void serio_unregister_child_port(struct serio *serio) | |
716 | { | |
c4e32e9f | 717 | mutex_lock(&serio_mutex); |
3c803e8e LT |
718 | if (serio->child) { |
719 | serio_disconnect_port(serio->child); | |
720 | serio_destroy_port(serio->child); | |
721 | } | |
c4e32e9f | 722 | mutex_unlock(&serio_mutex); |
3c803e8e | 723 | } |
89b09b99 | 724 | EXPORT_SYMBOL(serio_unregister_child_port); |
3c803e8e | 725 | |
1da177e4 LT |
726 | |
727 | /* | |
728 | * Serio driver operations | |
729 | */ | |
730 | ||
731 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
732 | { | |
733 | struct serio_driver *driver = to_serio_driver(drv); | |
734 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
735 | } | |
736 | ||
737 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
738 | { | |
739 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
740 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
741 | } | |
742 | ||
743 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
744 | { | |
745 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
746 | int retval; | |
747 | ||
748 | retval = count; | |
749 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 750 | serio_drv->manual_bind = true; |
1da177e4 | 751 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 752 | serio_drv->manual_bind = false; |
1da177e4 LT |
753 | } else { |
754 | retval = -EINVAL; | |
755 | } | |
756 | ||
757 | return retval; | |
758 | } | |
759 | ||
760 | ||
761 | static struct driver_attribute serio_driver_attrs[] = { | |
762 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
763 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
764 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
765 | __ATTR_NULL | |
766 | }; | |
767 | ||
768 | static int serio_driver_probe(struct device *dev) | |
769 | { | |
770 | struct serio *serio = to_serio_port(dev); | |
771 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
772 | ||
3c803e8e | 773 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
774 | } |
775 | ||
776 | static int serio_driver_remove(struct device *dev) | |
777 | { | |
778 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 779 | |
3c803e8e | 780 | serio_disconnect_driver(serio); |
1da177e4 LT |
781 | return 0; |
782 | } | |
783 | ||
82dd9eff DT |
784 | static void serio_cleanup(struct serio *serio) |
785 | { | |
33143ea1 | 786 | mutex_lock(&serio->drv_mutex); |
82dd9eff DT |
787 | if (serio->drv && serio->drv->cleanup) |
788 | serio->drv->cleanup(serio); | |
33143ea1 | 789 | mutex_unlock(&serio->drv_mutex); |
82dd9eff DT |
790 | } |
791 | ||
792 | static void serio_shutdown(struct device *dev) | |
793 | { | |
794 | struct serio *serio = to_serio_port(dev); | |
795 | ||
796 | serio_cleanup(serio); | |
797 | } | |
798 | ||
ed7b1f6d | 799 | static void serio_attach_driver(struct serio_driver *drv) |
73b59a3b RD |
800 | { |
801 | int error; | |
802 | ||
ed7b1f6d | 803 | error = driver_attach(&drv->driver); |
73b59a3b | 804 | if (error) |
ed7b1f6d DT |
805 | printk(KERN_WARNING |
806 | "serio: driver_attach() failed for %s with error %d\n", | |
73b59a3b RD |
807 | drv->driver.name, error); |
808 | } | |
809 | ||
4b315627 | 810 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
1da177e4 | 811 | { |
7e044e05 | 812 | bool manual_bind = drv->manual_bind; |
ed7b1f6d DT |
813 | int error; |
814 | ||
1da177e4 | 815 | drv->driver.bus = &serio_bus; |
4b315627 GKH |
816 | drv->driver.owner = owner; |
817 | drv->driver.mod_name = mod_name; | |
1da177e4 | 818 | |
ed7b1f6d DT |
819 | /* |
820 | * Temporarily disable automatic binding because probing | |
821 | * takes long time and we are better off doing it in kseriod | |
822 | */ | |
7e044e05 | 823 | drv->manual_bind = true; |
ed7b1f6d DT |
824 | |
825 | error = driver_register(&drv->driver); | |
826 | if (error) { | |
827 | printk(KERN_ERR | |
828 | "serio: driver_register() failed for %s, error: %d\n", | |
829 | drv->driver.name, error); | |
830 | return error; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Restore original bind mode and let kseriod bind the | |
835 | * driver to free ports | |
836 | */ | |
837 | if (!manual_bind) { | |
7e044e05 | 838 | drv->manual_bind = false; |
ed7b1f6d DT |
839 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
840 | if (error) { | |
841 | driver_unregister(&drv->driver); | |
842 | return error; | |
843 | } | |
844 | } | |
845 | ||
846 | return 0; | |
1da177e4 | 847 | } |
89b09b99 | 848 | EXPORT_SYMBOL(__serio_register_driver); |
1da177e4 LT |
849 | |
850 | void serio_unregister_driver(struct serio_driver *drv) | |
851 | { | |
852 | struct serio *serio; | |
853 | ||
c4e32e9f | 854 | mutex_lock(&serio_mutex); |
e8ef4347 | 855 | |
7e044e05 | 856 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
e8ef4347 | 857 | serio_remove_pending_events(drv); |
1da177e4 LT |
858 | |
859 | start_over: | |
860 | list_for_each_entry(serio, &serio_list, node) { | |
861 | if (serio->drv == drv) { | |
862 | serio_disconnect_port(serio); | |
863 | serio_find_driver(serio); | |
864 | /* we could've deleted some ports, restart */ | |
865 | goto start_over; | |
866 | } | |
867 | } | |
868 | ||
869 | driver_unregister(&drv->driver); | |
c4e32e9f | 870 | mutex_unlock(&serio_mutex); |
1da177e4 | 871 | } |
89b09b99 | 872 | EXPORT_SYMBOL(serio_unregister_driver); |
1da177e4 LT |
873 | |
874 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
875 | { | |
1da177e4 LT |
876 | serio_pause_rx(serio); |
877 | serio->drv = drv; | |
878 | serio_continue_rx(serio); | |
1da177e4 LT |
879 | } |
880 | ||
881 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
882 | { | |
883 | struct serio *serio = to_serio_port(dev); | |
884 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
885 | ||
886 | if (serio->manual_bind || serio_drv->manual_bind) | |
887 | return 0; | |
888 | ||
889 | return serio_match_port(serio_drv->id_table, serio); | |
890 | } | |
891 | ||
892 | #ifdef CONFIG_HOTPLUG | |
893 | ||
312c004d | 894 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 895 | do { \ |
7eff2e7a | 896 | int err = add_uevent_var(env, fmt, val); \ |
ae87dff7 DT |
897 | if (err) \ |
898 | return err; \ | |
899 | } while (0) | |
900 | ||
7eff2e7a | 901 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
902 | { |
903 | struct serio *serio; | |
1da177e4 LT |
904 | |
905 | if (!dev) | |
906 | return -ENODEV; | |
907 | ||
908 | serio = to_serio_port(dev); | |
909 | ||
312c004d KS |
910 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
911 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
912 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
913 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
914 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
ae87dff7 | 915 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 LT |
916 | |
917 | return 0; | |
918 | } | |
312c004d | 919 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 LT |
920 | |
921 | #else | |
922 | ||
7eff2e7a | 923 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
924 | { |
925 | return -ENODEV; | |
926 | } | |
927 | ||
928 | #endif /* CONFIG_HOTPLUG */ | |
929 | ||
82dd9eff | 930 | #ifdef CONFIG_PM |
633aae23 | 931 | static int serio_suspend(struct device *dev) |
82dd9eff | 932 | { |
7e044e05 | 933 | struct serio *serio = to_serio_port(dev); |
82dd9eff | 934 | |
633aae23 | 935 | serio_cleanup(serio); |
82dd9eff DT |
936 | |
937 | return 0; | |
938 | } | |
939 | ||
1da177e4 LT |
940 | static int serio_resume(struct device *dev) |
941 | { | |
7e044e05 DT |
942 | struct serio *serio = to_serio_port(dev); |
943 | ||
6aabcdff SL |
944 | /* |
945 | * Driver reconnect can take a while, so better let kseriod | |
946 | * deal with it. | |
947 | */ | |
633aae23 | 948 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); |
1da177e4 LT |
949 | |
950 | return 0; | |
951 | } | |
633aae23 DT |
952 | |
953 | static const struct dev_pm_ops serio_pm_ops = { | |
954 | .suspend = serio_suspend, | |
955 | .resume = serio_resume, | |
956 | .poweroff = serio_suspend, | |
957 | .restore = serio_resume, | |
958 | }; | |
82dd9eff | 959 | #endif /* CONFIG_PM */ |
1da177e4 | 960 | |
c4e32e9f | 961 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
962 | int serio_open(struct serio *serio, struct serio_driver *drv) |
963 | { | |
964 | serio_set_drv(serio, drv); | |
965 | ||
966 | if (serio->open && serio->open(serio)) { | |
967 | serio_set_drv(serio, NULL); | |
968 | return -1; | |
969 | } | |
970 | return 0; | |
971 | } | |
89b09b99 | 972 | EXPORT_SYMBOL(serio_open); |
1da177e4 | 973 | |
c4e32e9f | 974 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
975 | void serio_close(struct serio *serio) |
976 | { | |
977 | if (serio->close) | |
978 | serio->close(serio); | |
979 | ||
980 | serio_set_drv(serio, NULL); | |
981 | } | |
89b09b99 | 982 | EXPORT_SYMBOL(serio_close); |
1da177e4 LT |
983 | |
984 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 985 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
986 | { |
987 | unsigned long flags; | |
988 | irqreturn_t ret = IRQ_NONE; | |
989 | ||
990 | spin_lock_irqsave(&serio->lock, flags); | |
991 | ||
992 | if (likely(serio->drv)) { | |
7d12e780 | 993 | ret = serio->drv->interrupt(serio, data, dfl); |
ddf1ffbd | 994 | } else if (!dfl && device_is_registered(&serio->dev)) { |
1da177e4 LT |
995 | serio_rescan(serio); |
996 | ret = IRQ_HANDLED; | |
997 | } | |
998 | ||
999 | spin_unlock_irqrestore(&serio->lock, flags); | |
1000 | ||
1001 | return ret; | |
1002 | } | |
89b09b99 | 1003 | EXPORT_SYMBOL(serio_interrupt); |
1da177e4 | 1004 | |
1ea2a69d MN |
1005 | static struct bus_type serio_bus = { |
1006 | .name = "serio", | |
1007 | .dev_attrs = serio_device_attrs, | |
1008 | .drv_attrs = serio_driver_attrs, | |
1009 | .match = serio_bus_match, | |
1010 | .uevent = serio_uevent, | |
1011 | .probe = serio_driver_probe, | |
1012 | .remove = serio_driver_remove, | |
82dd9eff DT |
1013 | .shutdown = serio_shutdown, |
1014 | #ifdef CONFIG_PM | |
633aae23 | 1015 | .pm = &serio_pm_ops, |
82dd9eff | 1016 | #endif |
1ea2a69d MN |
1017 | }; |
1018 | ||
1da177e4 LT |
1019 | static int __init serio_init(void) |
1020 | { | |
73b59a3b | 1021 | int error; |
1da177e4 | 1022 | |
73b59a3b RD |
1023 | error = bus_register(&serio_bus); |
1024 | if (error) { | |
1025 | printk(KERN_ERR "serio: failed to register serio bus, error: %d\n", error); | |
1026 | return error; | |
1027 | } | |
1028 | ||
1029 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); | |
1030 | if (IS_ERR(serio_task)) { | |
1031 | bus_unregister(&serio_bus); | |
1032 | error = PTR_ERR(serio_task); | |
1033 | printk(KERN_ERR "serio: Failed to start kseriod, error: %d\n", error); | |
1034 | return error; | |
1035 | } | |
1da177e4 LT |
1036 | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static void __exit serio_exit(void) | |
1041 | { | |
1042 | bus_unregister(&serio_bus); | |
3c803e8e | 1043 | kthread_stop(serio_task); |
1da177e4 LT |
1044 | } |
1045 | ||
51c38f9b | 1046 | subsys_initcall(serio_init); |
1da177e4 | 1047 | module_exit(serio_exit); |