Commit | Line | Data |
---|---|---|
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 | ||
cac9169b DT |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | ||
1da177e4 LT |
31 | #include <linux/stddef.h> |
32 | #include <linux/module.h> | |
33 | #include <linux/serio.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/wait.h> | |
1da177e4 | 36 | #include <linux/sched.h> |
1da177e4 | 37 | #include <linux/slab.h> |
3c803e8e | 38 | #include <linux/kthread.h> |
c4e32e9f | 39 | #include <linux/mutex.h> |
7dfb7103 | 40 | #include <linux/freezer.h> |
1da177e4 LT |
41 | |
42 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
43 | MODULE_DESCRIPTION("Serio abstraction core"); | |
44 | MODULE_LICENSE("GPL"); | |
45 | ||
1da177e4 | 46 | /* |
c4e32e9f | 47 | * serio_mutex protects entire serio subsystem and is taken every time |
1da177e4 LT |
48 | * serio port or driver registrered or unregistered. |
49 | */ | |
c4e32e9f | 50 | static DEFINE_MUTEX(serio_mutex); |
1da177e4 LT |
51 | |
52 | static LIST_HEAD(serio_list); | |
53 | ||
30226f81 | 54 | static struct bus_type serio_bus; |
1da177e4 LT |
55 | |
56 | static void serio_add_port(struct serio *serio); | |
6aabcdff | 57 | static int serio_reconnect_port(struct serio *serio); |
1da177e4 | 58 | static void serio_disconnect_port(struct serio *serio); |
6aabcdff | 59 | static void serio_reconnect_chain(struct serio *serio); |
ed7b1f6d | 60 | static void serio_attach_driver(struct serio_driver *drv); |
1da177e4 | 61 | |
3c803e8e LT |
62 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
63 | { | |
64 | int retval; | |
65 | ||
c4e32e9f | 66 | mutex_lock(&serio->drv_mutex); |
3c803e8e | 67 | retval = drv->connect(serio, drv); |
c4e32e9f | 68 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
69 | |
70 | return retval; | |
71 | } | |
72 | ||
73 | static int serio_reconnect_driver(struct serio *serio) | |
74 | { | |
75 | int retval = -1; | |
76 | ||
c4e32e9f | 77 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
78 | if (serio->drv && serio->drv->reconnect) |
79 | retval = serio->drv->reconnect(serio); | |
c4e32e9f | 80 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
81 | |
82 | return retval; | |
83 | } | |
84 | ||
85 | static void serio_disconnect_driver(struct serio *serio) | |
86 | { | |
c4e32e9f | 87 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
88 | if (serio->drv) |
89 | serio->drv->disconnect(serio); | |
c4e32e9f | 90 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
91 | } |
92 | ||
1da177e4 LT |
93 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
94 | { | |
95 | while (ids->type || ids->proto) { | |
96 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && | |
97 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && | |
98 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && | |
99 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) | |
100 | return 1; | |
101 | ids++; | |
102 | } | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Basic serio -> driver core mappings | |
108 | */ | |
109 | ||
70f256fd | 110 | static int serio_bind_driver(struct serio *serio, struct serio_driver *drv) |
1da177e4 | 111 | { |
0a66045b DT |
112 | int error; |
113 | ||
1da177e4 | 114 | if (serio_match_port(drv->id_table, serio)) { |
70f256fd | 115 | |
1da177e4 | 116 | serio->dev.driver = &drv->driver; |
3c803e8e | 117 | if (serio_connect_driver(serio, drv)) { |
1da177e4 | 118 | serio->dev.driver = NULL; |
70f256fd | 119 | return -ENODEV; |
1da177e4 | 120 | } |
70f256fd | 121 | |
0a66045b DT |
122 | error = device_bind_driver(&serio->dev); |
123 | if (error) { | |
cac9169b DT |
124 | dev_warn(&serio->dev, |
125 | "device_bind_driver() failed for %s (%s) and %s, error: %d\n", | |
126 | serio->phys, serio->name, | |
127 | drv->description, error); | |
0a66045b DT |
128 | serio_disconnect_driver(serio); |
129 | serio->dev.driver = NULL; | |
70f256fd | 130 | return error; |
0a66045b | 131 | } |
1da177e4 | 132 | } |
70f256fd | 133 | return 0; |
1da177e4 LT |
134 | } |
135 | ||
136 | static void serio_find_driver(struct serio *serio) | |
137 | { | |
73b59a3b RD |
138 | int error; |
139 | ||
73b59a3b RD |
140 | error = device_attach(&serio->dev); |
141 | if (error < 0) | |
cac9169b DT |
142 | dev_warn(&serio->dev, |
143 | "device_attach() failed for %s (%s), error: %d\n", | |
144 | serio->phys, serio->name, error); | |
1da177e4 LT |
145 | } |
146 | ||
147 | ||
148 | /* | |
149 | * Serio event processing. | |
150 | */ | |
151 | ||
152 | enum serio_event_type { | |
ed7b1f6d DT |
153 | SERIO_RESCAN_PORT, |
154 | SERIO_RECONNECT_PORT, | |
6aabcdff | 155 | SERIO_RECONNECT_CHAIN, |
1da177e4 | 156 | SERIO_REGISTER_PORT, |
ed7b1f6d | 157 | SERIO_ATTACH_DRIVER, |
1da177e4 LT |
158 | }; |
159 | ||
160 | struct serio_event { | |
161 | enum serio_event_type type; | |
162 | void *object; | |
163 | struct module *owner; | |
164 | struct list_head node; | |
165 | }; | |
166 | ||
167 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
168 | static LIST_HEAD(serio_event_list); | |
169 | static DECLARE_WAIT_QUEUE_HEAD(serio_wait); | |
3c803e8e | 170 | static struct task_struct *serio_task; |
1da177e4 | 171 | |
ed7b1f6d DT |
172 | static int serio_queue_event(void *object, struct module *owner, |
173 | enum serio_event_type event_type) | |
1da177e4 LT |
174 | { |
175 | unsigned long flags; | |
176 | struct serio_event *event; | |
ed7b1f6d | 177 | int retval = 0; |
1da177e4 LT |
178 | |
179 | spin_lock_irqsave(&serio_event_lock, flags); | |
180 | ||
181 | /* | |
3c803e8e | 182 | * Scan event list for the other events for the same serio port, |
1da177e4 LT |
183 | * starting with the most recent one. If event is the same we |
184 | * do not need add new one. If event is of different type we | |
185 | * need to add this event and should not look further because | |
186 | * we need to preseve sequence of distinct events. | |
3c803e8e | 187 | */ |
1da177e4 LT |
188 | list_for_each_entry_reverse(event, &serio_event_list, node) { |
189 | if (event->object == object) { | |
190 | if (event->type == event_type) | |
191 | goto out; | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
ed7b1f6d DT |
196 | event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); |
197 | if (!event) { | |
cac9169b | 198 | pr_err("Not enough memory to queue event %d\n", event_type); |
ed7b1f6d DT |
199 | retval = -ENOMEM; |
200 | goto out; | |
201 | } | |
1da177e4 | 202 | |
ed7b1f6d | 203 | if (!try_module_get(owner)) { |
cac9169b DT |
204 | pr_warning("Can't get module reference, dropping event %d\n", |
205 | event_type); | |
ed7b1f6d DT |
206 | kfree(event); |
207 | retval = -EINVAL; | |
208 | goto out; | |
1da177e4 | 209 | } |
ed7b1f6d DT |
210 | |
211 | event->type = event_type; | |
212 | event->object = object; | |
213 | event->owner = owner; | |
214 | ||
215 | list_add_tail(&event->node, &serio_event_list); | |
216 | wake_up(&serio_wait); | |
217 | ||
1da177e4 LT |
218 | out: |
219 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
ed7b1f6d | 220 | return retval; |
1da177e4 LT |
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 | { | |
4516c818 | 231 | struct serio_event *e, *next; |
1da177e4 LT |
232 | unsigned long flags; |
233 | ||
234 | spin_lock_irqsave(&serio_event_lock, flags); | |
235 | ||
4516c818 | 236 | list_for_each_entry_safe(e, next, &serio_event_list, node) { |
1da177e4 LT |
237 | if (event->object == e->object) { |
238 | /* | |
239 | * If this event is of different type we should not | |
240 | * look further - we only suppress duplicate events | |
241 | * that were sent back-to-back. | |
242 | */ | |
243 | if (event->type != e->type) | |
244 | break; | |
245 | ||
4516c818 | 246 | list_del_init(&e->node); |
1da177e4 LT |
247 | serio_free_event(e); |
248 | } | |
249 | } | |
250 | ||
251 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
252 | } | |
253 | ||
254 | ||
255 | static struct serio_event *serio_get_event(void) | |
256 | { | |
4516c818 | 257 | struct serio_event *event = NULL; |
1da177e4 LT |
258 | unsigned long flags; |
259 | ||
260 | spin_lock_irqsave(&serio_event_lock, flags); | |
261 | ||
4516c818 DT |
262 | if (!list_empty(&serio_event_list)) { |
263 | event = list_first_entry(&serio_event_list, | |
264 | struct serio_event, node); | |
265 | list_del_init(&event->node); | |
1da177e4 LT |
266 | } |
267 | ||
1da177e4 | 268 | spin_unlock_irqrestore(&serio_event_lock, flags); |
1da177e4 LT |
269 | return event; |
270 | } | |
271 | ||
9e50afd0 | 272 | static void serio_handle_event(void) |
1da177e4 LT |
273 | { |
274 | struct serio_event *event; | |
1da177e4 | 275 | |
c4e32e9f | 276 | mutex_lock(&serio_mutex); |
1da177e4 | 277 | |
9e50afd0 DT |
278 | /* |
279 | * Note that we handle only one event here to give swsusp | |
280 | * a chance to freeze kseriod thread. Serio events should | |
281 | * be pretty rare so we are not concerned about taking | |
282 | * performance hit. | |
283 | */ | |
284 | if ((event = serio_get_event())) { | |
1da177e4 LT |
285 | |
286 | switch (event->type) { | |
1da177e4 | 287 | |
cac9169b DT |
288 | case SERIO_REGISTER_PORT: |
289 | serio_add_port(event->object); | |
290 | break; | |
1da177e4 | 291 | |
cac9169b DT |
292 | case SERIO_RECONNECT_PORT: |
293 | serio_reconnect_port(event->object); | |
294 | break; | |
1da177e4 | 295 | |
cac9169b DT |
296 | case SERIO_RESCAN_PORT: |
297 | serio_disconnect_port(event->object); | |
298 | serio_find_driver(event->object); | |
299 | break; | |
6aabcdff | 300 | |
cac9169b DT |
301 | case SERIO_RECONNECT_CHAIN: |
302 | serio_reconnect_chain(event->object); | |
303 | break; | |
1da177e4 | 304 | |
cac9169b DT |
305 | case SERIO_ATTACH_DRIVER: |
306 | serio_attach_driver(event->object); | |
307 | break; | |
1da177e4 LT |
308 | } |
309 | ||
310 | serio_remove_duplicate_events(event); | |
311 | serio_free_event(event); | |
312 | } | |
313 | ||
c4e32e9f | 314 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
315 | } |
316 | ||
317 | /* | |
e8ef4347 DT |
318 | * Remove all events that have been submitted for a given |
319 | * object, be it serio port or driver. | |
1da177e4 | 320 | */ |
e8ef4347 | 321 | static void serio_remove_pending_events(void *object) |
1da177e4 | 322 | { |
4516c818 | 323 | struct serio_event *event, *next; |
1da177e4 LT |
324 | unsigned long flags; |
325 | ||
326 | spin_lock_irqsave(&serio_event_lock, flags); | |
327 | ||
4516c818 | 328 | list_for_each_entry_safe(event, next, &serio_event_list, node) { |
e8ef4347 | 329 | if (event->object == object) { |
4516c818 | 330 | list_del_init(&event->node); |
1da177e4 LT |
331 | serio_free_event(event); |
332 | } | |
333 | } | |
334 | ||
335 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Destroy child serio port (if any) that has not been fully registered yet. | |
340 | * | |
341 | * Note that we rely on the fact that port can have only one child and therefore | |
342 | * only one child registration request can be pending. Additionally, children | |
343 | * are registered by driver's connect() handler so there can't be a grandchild | |
344 | * pending registration together with a child. | |
345 | */ | |
346 | static struct serio *serio_get_pending_child(struct serio *parent) | |
347 | { | |
348 | struct serio_event *event; | |
349 | struct serio *serio, *child = NULL; | |
350 | unsigned long flags; | |
351 | ||
352 | spin_lock_irqsave(&serio_event_lock, flags); | |
353 | ||
354 | list_for_each_entry(event, &serio_event_list, node) { | |
355 | if (event->type == SERIO_REGISTER_PORT) { | |
356 | serio = event->object; | |
357 | if (serio->parent == parent) { | |
358 | child = serio; | |
359 | break; | |
360 | } | |
361 | } | |
362 | } | |
363 | ||
364 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
365 | return child; | |
366 | } | |
367 | ||
368 | static int serio_thread(void *nothing) | |
369 | { | |
83144186 | 370 | set_freezable(); |
1da177e4 | 371 | do { |
9e50afd0 | 372 | serio_handle_event(); |
e42837bc | 373 | wait_event_freezable(serio_wait, |
3c803e8e | 374 | kthread_should_stop() || !list_empty(&serio_event_list)); |
3c803e8e | 375 | } while (!kthread_should_stop()); |
1da177e4 | 376 | |
3c803e8e | 377 | return 0; |
1da177e4 LT |
378 | } |
379 | ||
380 | ||
381 | /* | |
382 | * Serio port operations | |
383 | */ | |
384 | ||
e404e274 | 385 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
386 | { |
387 | struct serio *serio = to_serio_port(dev); | |
388 | return sprintf(buf, "%s\n", serio->name); | |
389 | } | |
390 | ||
ae87dff7 DT |
391 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
392 | { | |
393 | struct serio *serio = to_serio_port(dev); | |
394 | ||
395 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
396 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
397 | } | |
398 | ||
e404e274 | 399 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
400 | { |
401 | struct serio *serio = to_serio_port(dev); | |
402 | return sprintf(buf, "%02x\n", serio->id.type); | |
403 | } | |
404 | ||
e404e274 | 405 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
406 | { |
407 | struct serio *serio = to_serio_port(dev); | |
408 | return sprintf(buf, "%02x\n", serio->id.proto); | |
409 | } | |
410 | ||
e404e274 | 411 | static ssize_t serio_show_id_id(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.id); | |
415 | } | |
416 | ||
e404e274 | 417 | static ssize_t serio_show_id_extra(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.extra); | |
421 | } | |
422 | ||
baae9561 DT |
423 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
424 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
425 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
426 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
427 | ||
428 | static struct attribute *serio_device_id_attrs[] = { | |
429 | &dev_attr_type.attr, | |
430 | &dev_attr_proto.attr, | |
431 | &dev_attr_id.attr, | |
432 | &dev_attr_extra.attr, | |
433 | NULL | |
434 | }; | |
435 | ||
436 | static struct attribute_group serio_id_attr_group = { | |
437 | .name = "id", | |
438 | .attrs = serio_device_id_attrs, | |
439 | }; | |
440 | ||
386d8772 DT |
441 | static const struct attribute_group *serio_device_attr_groups[] = { |
442 | &serio_id_attr_group, | |
443 | NULL | |
444 | }; | |
445 | ||
e404e274 | 446 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
447 | { |
448 | struct serio *serio = to_serio_port(dev); | |
449 | struct device_driver *drv; | |
70f256fd | 450 | int error; |
1da177e4 | 451 | |
70f256fd DT |
452 | error = mutex_lock_interruptible(&serio_mutex); |
453 | if (error) | |
454 | return error; | |
1da177e4 | 455 | |
1da177e4 LT |
456 | if (!strncmp(buf, "none", count)) { |
457 | serio_disconnect_port(serio); | |
458 | } else if (!strncmp(buf, "reconnect", count)) { | |
6aabcdff | 459 | serio_reconnect_chain(serio); |
1da177e4 LT |
460 | } else if (!strncmp(buf, "rescan", count)) { |
461 | serio_disconnect_port(serio); | |
462 | serio_find_driver(serio); | |
463 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
464 | serio_disconnect_port(serio); | |
70f256fd | 465 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
1da177e4 LT |
466 | put_driver(drv); |
467 | } else { | |
70f256fd | 468 | error = -EINVAL; |
1da177e4 LT |
469 | } |
470 | ||
c4e32e9f | 471 | mutex_unlock(&serio_mutex); |
1da177e4 | 472 | |
70f256fd | 473 | return error ? error : count; |
1da177e4 LT |
474 | } |
475 | ||
e404e274 | 476 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
477 | { |
478 | struct serio *serio = to_serio_port(dev); | |
479 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
480 | } | |
481 | ||
e404e274 | 482 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
483 | { |
484 | struct serio *serio = to_serio_port(dev); | |
485 | int retval; | |
486 | ||
487 | retval = count; | |
488 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 489 | serio->manual_bind = true; |
1da177e4 | 490 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 491 | serio->manual_bind = false; |
1da177e4 LT |
492 | } else { |
493 | retval = -EINVAL; | |
494 | } | |
495 | ||
496 | return retval; | |
497 | } | |
498 | ||
499 | static struct device_attribute serio_device_attrs[] = { | |
500 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 501 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
502 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
503 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
504 | __ATTR_NULL | |
505 | }; | |
506 | ||
507 | ||
508 | static void serio_release_port(struct device *dev) | |
509 | { | |
510 | struct serio *serio = to_serio_port(dev); | |
511 | ||
512 | kfree(serio); | |
513 | module_put(THIS_MODULE); | |
514 | } | |
515 | ||
516 | /* | |
517 | * Prepare serio port for registration. | |
518 | */ | |
519 | static void serio_init_port(struct serio *serio) | |
520 | { | |
521 | static atomic_t serio_no = ATOMIC_INIT(0); | |
522 | ||
523 | __module_get(THIS_MODULE); | |
524 | ||
73b59a3b | 525 | INIT_LIST_HEAD(&serio->node); |
1da177e4 | 526 | spin_lock_init(&serio->lock); |
c4e32e9f | 527 | mutex_init(&serio->drv_mutex); |
1da177e4 | 528 | device_initialize(&serio->dev); |
a6c2490f KS |
529 | dev_set_name(&serio->dev, "serio%ld", |
530 | (long)atomic_inc_return(&serio_no) - 1); | |
1da177e4 LT |
531 | serio->dev.bus = &serio_bus; |
532 | serio->dev.release = serio_release_port; | |
386d8772 | 533 | serio->dev.groups = serio_device_attr_groups; |
88aa0103 | 534 | if (serio->parent) { |
1da177e4 | 535 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
536 | serio->depth = serio->parent->depth + 1; |
537 | } else | |
538 | serio->depth = 0; | |
539 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
540 | } |
541 | ||
542 | /* | |
543 | * Complete serio port registration. | |
544 | * Driver core will attempt to find appropriate driver for the port. | |
545 | */ | |
546 | static void serio_add_port(struct serio *serio) | |
547 | { | |
73b59a3b RD |
548 | int error; |
549 | ||
1da177e4 LT |
550 | if (serio->parent) { |
551 | serio_pause_rx(serio->parent); | |
552 | serio->parent->child = serio; | |
553 | serio_continue_rx(serio->parent); | |
554 | } | |
555 | ||
556 | list_add_tail(&serio->node, &serio_list); | |
386d8772 | 557 | |
1da177e4 LT |
558 | if (serio->start) |
559 | serio->start(serio); | |
386d8772 | 560 | |
73b59a3b RD |
561 | error = device_add(&serio->dev); |
562 | if (error) | |
cac9169b DT |
563 | dev_err(&serio->dev, |
564 | "device_add() failed for %s (%s), error: %d\n", | |
73b59a3b | 565 | serio->phys, serio->name, error); |
1da177e4 LT |
566 | } |
567 | ||
568 | /* | |
569 | * serio_destroy_port() completes deregistration process and removes | |
570 | * port from the system | |
571 | */ | |
572 | static void serio_destroy_port(struct serio *serio) | |
573 | { | |
574 | struct serio *child; | |
575 | ||
576 | child = serio_get_pending_child(serio); | |
577 | if (child) { | |
578 | serio_remove_pending_events(child); | |
579 | put_device(&child->dev); | |
580 | } | |
581 | ||
582 | if (serio->stop) | |
583 | serio->stop(serio); | |
584 | ||
585 | if (serio->parent) { | |
586 | serio_pause_rx(serio->parent); | |
587 | serio->parent->child = NULL; | |
588 | serio_continue_rx(serio->parent); | |
589 | serio->parent = NULL; | |
590 | } | |
591 | ||
ddf1ffbd | 592 | if (device_is_registered(&serio->dev)) |
1da177e4 | 593 | device_del(&serio->dev); |
1da177e4 | 594 | |
73b59a3b | 595 | list_del_init(&serio->node); |
1da177e4 LT |
596 | serio_remove_pending_events(serio); |
597 | put_device(&serio->dev); | |
598 | } | |
599 | ||
6aabcdff SL |
600 | /* |
601 | * Reconnect serio port (re-initialize attached device). | |
602 | * If reconnect fails (old device is no longer attached or | |
603 | * there was no device to begin with) we do full rescan in | |
604 | * hope of finding a driver for the port. | |
605 | */ | |
606 | static int serio_reconnect_port(struct serio *serio) | |
607 | { | |
608 | int error = serio_reconnect_driver(serio); | |
609 | ||
610 | if (error) { | |
611 | serio_disconnect_port(serio); | |
612 | serio_find_driver(serio); | |
613 | } | |
614 | ||
615 | return error; | |
616 | } | |
617 | ||
1da177e4 LT |
618 | /* |
619 | * Reconnect serio port and all its children (re-initialize attached devices) | |
620 | */ | |
6aabcdff | 621 | static void serio_reconnect_chain(struct serio *serio) |
1da177e4 LT |
622 | { |
623 | do { | |
6aabcdff | 624 | if (serio_reconnect_port(serio)) { |
1da177e4 LT |
625 | /* Ok, old children are now gone, we are done */ |
626 | break; | |
627 | } | |
628 | serio = serio->child; | |
629 | } while (serio); | |
630 | } | |
631 | ||
632 | /* | |
633 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
634 | * all child ports are unbound and destroyed. | |
635 | */ | |
636 | static void serio_disconnect_port(struct serio *serio) | |
637 | { | |
638 | struct serio *s, *parent; | |
639 | ||
640 | if (serio->child) { | |
641 | /* | |
642 | * Children ports should be disconnected and destroyed | |
643 | * first, staring with the leaf one, since we don't want | |
644 | * to do recursion | |
645 | */ | |
646 | for (s = serio; s->child; s = s->child) | |
647 | /* empty */; | |
648 | ||
649 | do { | |
650 | parent = s->parent; | |
651 | ||
70f256fd | 652 | device_release_driver(&s->dev); |
1da177e4 LT |
653 | serio_destroy_port(s); |
654 | } while ((s = parent) != serio); | |
655 | } | |
656 | ||
657 | /* | |
658 | * Ok, no children left, now disconnect this port | |
659 | */ | |
70f256fd | 660 | device_release_driver(&serio->dev); |
1da177e4 LT |
661 | } |
662 | ||
663 | void serio_rescan(struct serio *serio) | |
664 | { | |
ed7b1f6d | 665 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
1da177e4 | 666 | } |
89b09b99 | 667 | EXPORT_SYMBOL(serio_rescan); |
1da177e4 LT |
668 | |
669 | void serio_reconnect(struct serio *serio) | |
670 | { | |
6aabcdff | 671 | serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN); |
1da177e4 | 672 | } |
89b09b99 | 673 | EXPORT_SYMBOL(serio_reconnect); |
1da177e4 LT |
674 | |
675 | /* | |
676 | * Submits register request to kseriod for subsequent execution. | |
677 | * Note that port registration is always asynchronous. | |
678 | */ | |
679 | void __serio_register_port(struct serio *serio, struct module *owner) | |
680 | { | |
681 | serio_init_port(serio); | |
682 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
683 | } | |
89b09b99 | 684 | EXPORT_SYMBOL(__serio_register_port); |
1da177e4 LT |
685 | |
686 | /* | |
687 | * Synchronously unregisters serio port. | |
688 | */ | |
689 | void serio_unregister_port(struct serio *serio) | |
690 | { | |
c4e32e9f | 691 | mutex_lock(&serio_mutex); |
1da177e4 LT |
692 | serio_disconnect_port(serio); |
693 | serio_destroy_port(serio); | |
c4e32e9f | 694 | mutex_unlock(&serio_mutex); |
1da177e4 | 695 | } |
89b09b99 | 696 | EXPORT_SYMBOL(serio_unregister_port); |
1da177e4 | 697 | |
3c803e8e LT |
698 | /* |
699 | * Safely unregisters child port if one is present. | |
700 | */ | |
701 | void serio_unregister_child_port(struct serio *serio) | |
702 | { | |
c4e32e9f | 703 | mutex_lock(&serio_mutex); |
3c803e8e LT |
704 | if (serio->child) { |
705 | serio_disconnect_port(serio->child); | |
706 | serio_destroy_port(serio->child); | |
707 | } | |
c4e32e9f | 708 | mutex_unlock(&serio_mutex); |
3c803e8e | 709 | } |
89b09b99 | 710 | EXPORT_SYMBOL(serio_unregister_child_port); |
3c803e8e | 711 | |
1da177e4 LT |
712 | |
713 | /* | |
714 | * Serio driver operations | |
715 | */ | |
716 | ||
717 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
718 | { | |
719 | struct serio_driver *driver = to_serio_driver(drv); | |
720 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
721 | } | |
722 | ||
723 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
724 | { | |
725 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
726 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
727 | } | |
728 | ||
729 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
730 | { | |
731 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
732 | int retval; | |
733 | ||
734 | retval = count; | |
735 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 736 | serio_drv->manual_bind = true; |
1da177e4 | 737 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 738 | serio_drv->manual_bind = false; |
1da177e4 LT |
739 | } else { |
740 | retval = -EINVAL; | |
741 | } | |
742 | ||
743 | return retval; | |
744 | } | |
745 | ||
746 | ||
747 | static struct driver_attribute serio_driver_attrs[] = { | |
748 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
749 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
750 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
751 | __ATTR_NULL | |
752 | }; | |
753 | ||
754 | static int serio_driver_probe(struct device *dev) | |
755 | { | |
756 | struct serio *serio = to_serio_port(dev); | |
757 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
758 | ||
3c803e8e | 759 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
760 | } |
761 | ||
762 | static int serio_driver_remove(struct device *dev) | |
763 | { | |
764 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 765 | |
3c803e8e | 766 | serio_disconnect_driver(serio); |
1da177e4 LT |
767 | return 0; |
768 | } | |
769 | ||
82dd9eff DT |
770 | static void serio_cleanup(struct serio *serio) |
771 | { | |
33143ea1 | 772 | mutex_lock(&serio->drv_mutex); |
82dd9eff DT |
773 | if (serio->drv && serio->drv->cleanup) |
774 | serio->drv->cleanup(serio); | |
33143ea1 | 775 | mutex_unlock(&serio->drv_mutex); |
82dd9eff DT |
776 | } |
777 | ||
778 | static void serio_shutdown(struct device *dev) | |
779 | { | |
780 | struct serio *serio = to_serio_port(dev); | |
781 | ||
782 | serio_cleanup(serio); | |
783 | } | |
784 | ||
ed7b1f6d | 785 | static void serio_attach_driver(struct serio_driver *drv) |
73b59a3b RD |
786 | { |
787 | int error; | |
788 | ||
ed7b1f6d | 789 | error = driver_attach(&drv->driver); |
73b59a3b | 790 | if (error) |
cac9169b DT |
791 | pr_warning("driver_attach() failed for %s with error %d\n", |
792 | drv->driver.name, error); | |
73b59a3b RD |
793 | } |
794 | ||
4b315627 | 795 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
1da177e4 | 796 | { |
7e044e05 | 797 | bool manual_bind = drv->manual_bind; |
ed7b1f6d DT |
798 | int error; |
799 | ||
1da177e4 | 800 | drv->driver.bus = &serio_bus; |
4b315627 GKH |
801 | drv->driver.owner = owner; |
802 | drv->driver.mod_name = mod_name; | |
1da177e4 | 803 | |
ed7b1f6d DT |
804 | /* |
805 | * Temporarily disable automatic binding because probing | |
806 | * takes long time and we are better off doing it in kseriod | |
807 | */ | |
7e044e05 | 808 | drv->manual_bind = true; |
ed7b1f6d DT |
809 | |
810 | error = driver_register(&drv->driver); | |
811 | if (error) { | |
cac9169b | 812 | pr_err("driver_register() failed for %s, error: %d\n", |
ed7b1f6d DT |
813 | drv->driver.name, error); |
814 | return error; | |
815 | } | |
816 | ||
817 | /* | |
818 | * Restore original bind mode and let kseriod bind the | |
819 | * driver to free ports | |
820 | */ | |
821 | if (!manual_bind) { | |
7e044e05 | 822 | drv->manual_bind = false; |
ed7b1f6d DT |
823 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
824 | if (error) { | |
825 | driver_unregister(&drv->driver); | |
826 | return error; | |
827 | } | |
828 | } | |
829 | ||
830 | return 0; | |
1da177e4 | 831 | } |
89b09b99 | 832 | EXPORT_SYMBOL(__serio_register_driver); |
1da177e4 LT |
833 | |
834 | void serio_unregister_driver(struct serio_driver *drv) | |
835 | { | |
836 | struct serio *serio; | |
837 | ||
c4e32e9f | 838 | mutex_lock(&serio_mutex); |
e8ef4347 | 839 | |
7e044e05 | 840 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
e8ef4347 | 841 | serio_remove_pending_events(drv); |
1da177e4 LT |
842 | |
843 | start_over: | |
844 | list_for_each_entry(serio, &serio_list, node) { | |
845 | if (serio->drv == drv) { | |
846 | serio_disconnect_port(serio); | |
847 | serio_find_driver(serio); | |
848 | /* we could've deleted some ports, restart */ | |
849 | goto start_over; | |
850 | } | |
851 | } | |
852 | ||
853 | driver_unregister(&drv->driver); | |
c4e32e9f | 854 | mutex_unlock(&serio_mutex); |
1da177e4 | 855 | } |
89b09b99 | 856 | EXPORT_SYMBOL(serio_unregister_driver); |
1da177e4 LT |
857 | |
858 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
859 | { | |
1da177e4 LT |
860 | serio_pause_rx(serio); |
861 | serio->drv = drv; | |
862 | serio_continue_rx(serio); | |
1da177e4 LT |
863 | } |
864 | ||
865 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
866 | { | |
867 | struct serio *serio = to_serio_port(dev); | |
868 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
869 | ||
870 | if (serio->manual_bind || serio_drv->manual_bind) | |
871 | return 0; | |
872 | ||
873 | return serio_match_port(serio_drv->id_table, serio); | |
874 | } | |
875 | ||
876 | #ifdef CONFIG_HOTPLUG | |
877 | ||
312c004d | 878 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 879 | do { \ |
7eff2e7a | 880 | int err = add_uevent_var(env, fmt, val); \ |
ae87dff7 DT |
881 | if (err) \ |
882 | return err; \ | |
883 | } while (0) | |
884 | ||
7eff2e7a | 885 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
886 | { |
887 | struct serio *serio; | |
1da177e4 LT |
888 | |
889 | if (!dev) | |
890 | return -ENODEV; | |
891 | ||
892 | serio = to_serio_port(dev); | |
893 | ||
312c004d KS |
894 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
895 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
896 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
897 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
898 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
ae87dff7 | 899 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 LT |
900 | |
901 | return 0; | |
902 | } | |
312c004d | 903 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 LT |
904 | |
905 | #else | |
906 | ||
7eff2e7a | 907 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
908 | { |
909 | return -ENODEV; | |
910 | } | |
911 | ||
912 | #endif /* CONFIG_HOTPLUG */ | |
913 | ||
82dd9eff | 914 | #ifdef CONFIG_PM |
633aae23 | 915 | static int serio_suspend(struct device *dev) |
82dd9eff | 916 | { |
7e044e05 | 917 | struct serio *serio = to_serio_port(dev); |
82dd9eff | 918 | |
633aae23 | 919 | serio_cleanup(serio); |
82dd9eff DT |
920 | |
921 | return 0; | |
922 | } | |
923 | ||
1da177e4 LT |
924 | static int serio_resume(struct device *dev) |
925 | { | |
7e044e05 DT |
926 | struct serio *serio = to_serio_port(dev); |
927 | ||
6aabcdff SL |
928 | /* |
929 | * Driver reconnect can take a while, so better let kseriod | |
930 | * deal with it. | |
931 | */ | |
633aae23 | 932 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); |
1da177e4 LT |
933 | |
934 | return 0; | |
935 | } | |
633aae23 DT |
936 | |
937 | static const struct dev_pm_ops serio_pm_ops = { | |
938 | .suspend = serio_suspend, | |
939 | .resume = serio_resume, | |
940 | .poweroff = serio_suspend, | |
941 | .restore = serio_resume, | |
942 | }; | |
82dd9eff | 943 | #endif /* CONFIG_PM */ |
1da177e4 | 944 | |
c4e32e9f | 945 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
946 | int serio_open(struct serio *serio, struct serio_driver *drv) |
947 | { | |
948 | serio_set_drv(serio, drv); | |
949 | ||
950 | if (serio->open && serio->open(serio)) { | |
951 | serio_set_drv(serio, NULL); | |
952 | return -1; | |
953 | } | |
954 | return 0; | |
955 | } | |
89b09b99 | 956 | EXPORT_SYMBOL(serio_open); |
1da177e4 | 957 | |
c4e32e9f | 958 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
959 | void serio_close(struct serio *serio) |
960 | { | |
961 | if (serio->close) | |
962 | serio->close(serio); | |
963 | ||
964 | serio_set_drv(serio, NULL); | |
965 | } | |
89b09b99 | 966 | EXPORT_SYMBOL(serio_close); |
1da177e4 LT |
967 | |
968 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 969 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
970 | { |
971 | unsigned long flags; | |
972 | irqreturn_t ret = IRQ_NONE; | |
973 | ||
974 | spin_lock_irqsave(&serio->lock, flags); | |
975 | ||
976 | if (likely(serio->drv)) { | |
7d12e780 | 977 | ret = serio->drv->interrupt(serio, data, dfl); |
ddf1ffbd | 978 | } else if (!dfl && device_is_registered(&serio->dev)) { |
1da177e4 LT |
979 | serio_rescan(serio); |
980 | ret = IRQ_HANDLED; | |
981 | } | |
982 | ||
983 | spin_unlock_irqrestore(&serio->lock, flags); | |
984 | ||
985 | return ret; | |
986 | } | |
89b09b99 | 987 | EXPORT_SYMBOL(serio_interrupt); |
1da177e4 | 988 | |
1ea2a69d MN |
989 | static struct bus_type serio_bus = { |
990 | .name = "serio", | |
991 | .dev_attrs = serio_device_attrs, | |
992 | .drv_attrs = serio_driver_attrs, | |
993 | .match = serio_bus_match, | |
994 | .uevent = serio_uevent, | |
995 | .probe = serio_driver_probe, | |
996 | .remove = serio_driver_remove, | |
82dd9eff DT |
997 | .shutdown = serio_shutdown, |
998 | #ifdef CONFIG_PM | |
633aae23 | 999 | .pm = &serio_pm_ops, |
82dd9eff | 1000 | #endif |
1ea2a69d MN |
1001 | }; |
1002 | ||
1da177e4 LT |
1003 | static int __init serio_init(void) |
1004 | { | |
73b59a3b | 1005 | int error; |
1da177e4 | 1006 | |
73b59a3b RD |
1007 | error = bus_register(&serio_bus); |
1008 | if (error) { | |
cac9169b | 1009 | pr_err("Failed to register serio bus, error: %d\n", error); |
73b59a3b RD |
1010 | return error; |
1011 | } | |
1012 | ||
1013 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); | |
1014 | if (IS_ERR(serio_task)) { | |
1015 | bus_unregister(&serio_bus); | |
1016 | error = PTR_ERR(serio_task); | |
cac9169b | 1017 | pr_err("Failed to start kseriod, error: %d\n", error); |
73b59a3b RD |
1018 | return error; |
1019 | } | |
1da177e4 LT |
1020 | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static void __exit serio_exit(void) | |
1025 | { | |
1026 | bus_unregister(&serio_bus); | |
3c803e8e | 1027 | kthread_stop(serio_task); |
1da177e4 LT |
1028 | } |
1029 | ||
51c38f9b | 1030 | subsys_initcall(serio_init); |
1da177e4 | 1031 | module_exit(serio_exit); |