Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * The Serio abstraction module | |
3 | * | |
4 | * Copyright (c) 1999-2004 Vojtech Pavlik | |
5 | * Copyright (c) 2004 Dmitry Torokhov | |
6 | * Copyright (c) 2003 Daniele Bellucci | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Should you need to contact me, the author, you can do so either by | |
25 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
26 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
27 | */ | |
28 | ||
29 | #include <linux/stddef.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/serio.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/wait.h> | |
1da177e4 | 34 | #include <linux/sched.h> |
1da177e4 | 35 | #include <linux/slab.h> |
3c803e8e | 36 | #include <linux/kthread.h> |
c4e32e9f | 37 | #include <linux/mutex.h> |
7dfb7103 | 38 | #include <linux/freezer.h> |
1da177e4 LT |
39 | |
40 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
41 | MODULE_DESCRIPTION("Serio abstraction core"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
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 | |
ea486e68 | 287 | while ((event = serio_get_event())) { |
1da177e4 LT |
288 | |
289 | switch (event->type) { | |
290 | case SERIO_REGISTER_PORT: | |
291 | serio_add_port(event->object); | |
292 | break; | |
293 | ||
ed7b1f6d | 294 | case SERIO_RECONNECT_PORT: |
1da177e4 LT |
295 | serio_reconnect_port(event->object); |
296 | break; | |
297 | ||
ed7b1f6d | 298 | case SERIO_RESCAN_PORT: |
1da177e4 LT |
299 | serio_disconnect_port(event->object); |
300 | serio_find_driver(event->object); | |
301 | break; | |
302 | ||
6aabcdff SL |
303 | case SERIO_RECONNECT_CHAIN: |
304 | serio_reconnect_chain(event->object); | |
305 | break; | |
306 | ||
ed7b1f6d DT |
307 | case SERIO_ATTACH_DRIVER: |
308 | serio_attach_driver(event->object); | |
1da177e4 LT |
309 | break; |
310 | ||
311 | default: | |
312 | break; | |
313 | } | |
314 | ||
315 | serio_remove_duplicate_events(event); | |
316 | serio_free_event(event); | |
317 | } | |
318 | ||
c4e32e9f | 319 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
320 | } |
321 | ||
322 | /* | |
e8ef4347 DT |
323 | * Remove all events that have been submitted for a given |
324 | * object, be it serio port or driver. | |
1da177e4 | 325 | */ |
e8ef4347 | 326 | static void serio_remove_pending_events(void *object) |
1da177e4 LT |
327 | { |
328 | struct list_head *node, *next; | |
329 | struct serio_event *event; | |
330 | unsigned long flags; | |
331 | ||
332 | spin_lock_irqsave(&serio_event_lock, flags); | |
333 | ||
334 | list_for_each_safe(node, next, &serio_event_list) { | |
335 | event = list_entry(node, struct serio_event, node); | |
e8ef4347 | 336 | if (event->object == object) { |
1da177e4 LT |
337 | list_del_init(node); |
338 | serio_free_event(event); | |
339 | } | |
340 | } | |
341 | ||
342 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Destroy child serio port (if any) that has not been fully registered yet. | |
347 | * | |
348 | * Note that we rely on the fact that port can have only one child and therefore | |
349 | * only one child registration request can be pending. Additionally, children | |
350 | * are registered by driver's connect() handler so there can't be a grandchild | |
351 | * pending registration together with a child. | |
352 | */ | |
353 | static struct serio *serio_get_pending_child(struct serio *parent) | |
354 | { | |
355 | struct serio_event *event; | |
356 | struct serio *serio, *child = NULL; | |
357 | unsigned long flags; | |
358 | ||
359 | spin_lock_irqsave(&serio_event_lock, flags); | |
360 | ||
361 | list_for_each_entry(event, &serio_event_list, node) { | |
362 | if (event->type == SERIO_REGISTER_PORT) { | |
363 | serio = event->object; | |
364 | if (serio->parent == parent) { | |
365 | child = serio; | |
366 | break; | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
371 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
372 | return child; | |
373 | } | |
374 | ||
375 | static int serio_thread(void *nothing) | |
376 | { | |
1da177e4 | 377 | do { |
9e50afd0 | 378 | serio_handle_event(); |
ea486e68 | 379 | wait_event_interruptible(serio_wait, |
3c803e8e | 380 | kthread_should_stop() || !list_empty(&serio_event_list)); |
3c803e8e | 381 | } while (!kthread_should_stop()); |
1da177e4 LT |
382 | |
383 | printk(KERN_DEBUG "serio: kseriod exiting\n"); | |
3c803e8e | 384 | return 0; |
1da177e4 LT |
385 | } |
386 | ||
387 | ||
388 | /* | |
389 | * Serio port operations | |
390 | */ | |
391 | ||
e404e274 | 392 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
393 | { |
394 | struct serio *serio = to_serio_port(dev); | |
395 | return sprintf(buf, "%s\n", serio->name); | |
396 | } | |
397 | ||
ae87dff7 DT |
398 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
399 | { | |
400 | struct serio *serio = to_serio_port(dev); | |
401 | ||
402 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
403 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
404 | } | |
405 | ||
e404e274 | 406 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
407 | { |
408 | struct serio *serio = to_serio_port(dev); | |
409 | return sprintf(buf, "%02x\n", serio->id.type); | |
410 | } | |
411 | ||
e404e274 | 412 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
413 | { |
414 | struct serio *serio = to_serio_port(dev); | |
415 | return sprintf(buf, "%02x\n", serio->id.proto); | |
416 | } | |
417 | ||
e404e274 | 418 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
419 | { |
420 | struct serio *serio = to_serio_port(dev); | |
421 | return sprintf(buf, "%02x\n", serio->id.id); | |
422 | } | |
423 | ||
e404e274 | 424 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
425 | { |
426 | struct serio *serio = to_serio_port(dev); | |
427 | return sprintf(buf, "%02x\n", serio->id.extra); | |
428 | } | |
429 | ||
baae9561 DT |
430 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
431 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
432 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
433 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
434 | ||
435 | static struct attribute *serio_device_id_attrs[] = { | |
436 | &dev_attr_type.attr, | |
437 | &dev_attr_proto.attr, | |
438 | &dev_attr_id.attr, | |
439 | &dev_attr_extra.attr, | |
440 | NULL | |
441 | }; | |
442 | ||
443 | static struct attribute_group serio_id_attr_group = { | |
444 | .name = "id", | |
445 | .attrs = serio_device_id_attrs, | |
446 | }; | |
447 | ||
e404e274 | 448 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
449 | { |
450 | struct serio *serio = to_serio_port(dev); | |
451 | struct device_driver *drv; | |
70f256fd | 452 | int error; |
1da177e4 | 453 | |
70f256fd DT |
454 | error = mutex_lock_interruptible(&serio_mutex); |
455 | if (error) | |
456 | return error; | |
1da177e4 | 457 | |
1da177e4 LT |
458 | if (!strncmp(buf, "none", count)) { |
459 | serio_disconnect_port(serio); | |
460 | } else if (!strncmp(buf, "reconnect", count)) { | |
6aabcdff | 461 | serio_reconnect_chain(serio); |
1da177e4 LT |
462 | } else if (!strncmp(buf, "rescan", count)) { |
463 | serio_disconnect_port(serio); | |
464 | serio_find_driver(serio); | |
465 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
466 | serio_disconnect_port(serio); | |
70f256fd | 467 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
1da177e4 LT |
468 | put_driver(drv); |
469 | } else { | |
70f256fd | 470 | error = -EINVAL; |
1da177e4 LT |
471 | } |
472 | ||
c4e32e9f | 473 | mutex_unlock(&serio_mutex); |
1da177e4 | 474 | |
70f256fd | 475 | return error ? error : count; |
1da177e4 LT |
476 | } |
477 | ||
e404e274 | 478 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
479 | { |
480 | struct serio *serio = to_serio_port(dev); | |
481 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
482 | } | |
483 | ||
e404e274 | 484 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
485 | { |
486 | struct serio *serio = to_serio_port(dev); | |
487 | int retval; | |
488 | ||
489 | retval = count; | |
490 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 491 | serio->manual_bind = true; |
1da177e4 | 492 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 493 | serio->manual_bind = false; |
1da177e4 LT |
494 | } else { |
495 | retval = -EINVAL; | |
496 | } | |
497 | ||
498 | return retval; | |
499 | } | |
500 | ||
501 | static struct device_attribute serio_device_attrs[] = { | |
502 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 503 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
504 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
505 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
506 | __ATTR_NULL | |
507 | }; | |
508 | ||
509 | ||
510 | static void serio_release_port(struct device *dev) | |
511 | { | |
512 | struct serio *serio = to_serio_port(dev); | |
513 | ||
514 | kfree(serio); | |
515 | module_put(THIS_MODULE); | |
516 | } | |
517 | ||
518 | /* | |
519 | * Prepare serio port for registration. | |
520 | */ | |
521 | static void serio_init_port(struct serio *serio) | |
522 | { | |
523 | static atomic_t serio_no = ATOMIC_INIT(0); | |
524 | ||
525 | __module_get(THIS_MODULE); | |
526 | ||
73b59a3b | 527 | INIT_LIST_HEAD(&serio->node); |
1da177e4 | 528 | spin_lock_init(&serio->lock); |
c4e32e9f | 529 | mutex_init(&serio->drv_mutex); |
1da177e4 | 530 | device_initialize(&serio->dev); |
a6c2490f KS |
531 | dev_set_name(&serio->dev, "serio%ld", |
532 | (long)atomic_inc_return(&serio_no) - 1); | |
1da177e4 LT |
533 | serio->dev.bus = &serio_bus; |
534 | serio->dev.release = serio_release_port; | |
88aa0103 | 535 | if (serio->parent) { |
1da177e4 | 536 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
537 | serio->depth = serio->parent->depth + 1; |
538 | } else | |
539 | serio->depth = 0; | |
540 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
541 | } |
542 | ||
543 | /* | |
544 | * Complete serio port registration. | |
545 | * Driver core will attempt to find appropriate driver for the port. | |
546 | */ | |
547 | static void serio_add_port(struct serio *serio) | |
548 | { | |
73b59a3b RD |
549 | int error; |
550 | ||
1da177e4 LT |
551 | if (serio->parent) { |
552 | serio_pause_rx(serio->parent); | |
553 | serio->parent->child = serio; | |
554 | serio_continue_rx(serio->parent); | |
555 | } | |
556 | ||
557 | list_add_tail(&serio->node, &serio_list); | |
558 | if (serio->start) | |
559 | serio->start(serio); | |
73b59a3b RD |
560 | error = device_add(&serio->dev); |
561 | if (error) | |
562 | printk(KERN_ERR | |
563 | "serio: device_add() failed for %s (%s), error: %d\n", | |
564 | serio->phys, serio->name, error); | |
565 | else { | |
7e044e05 | 566 | serio->registered = true; |
73b59a3b RD |
567 | error = sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group); |
568 | if (error) | |
569 | printk(KERN_ERR | |
570 | "serio: sysfs_create_group() failed for %s (%s), error: %d\n", | |
571 | serio->phys, serio->name, error); | |
572 | } | |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
576 | * serio_destroy_port() completes deregistration process and removes | |
577 | * port from the system | |
578 | */ | |
579 | static void serio_destroy_port(struct serio *serio) | |
580 | { | |
581 | struct serio *child; | |
582 | ||
583 | child = serio_get_pending_child(serio); | |
584 | if (child) { | |
585 | serio_remove_pending_events(child); | |
586 | put_device(&child->dev); | |
587 | } | |
588 | ||
589 | if (serio->stop) | |
590 | serio->stop(serio); | |
591 | ||
592 | if (serio->parent) { | |
593 | serio_pause_rx(serio->parent); | |
594 | serio->parent->child = NULL; | |
595 | serio_continue_rx(serio->parent); | |
596 | serio->parent = NULL; | |
597 | } | |
598 | ||
599 | if (serio->registered) { | |
baae9561 | 600 | sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group); |
1da177e4 | 601 | device_del(&serio->dev); |
7e044e05 | 602 | serio->registered = false; |
1da177e4 LT |
603 | } |
604 | ||
73b59a3b | 605 | list_del_init(&serio->node); |
1da177e4 LT |
606 | serio_remove_pending_events(serio); |
607 | put_device(&serio->dev); | |
608 | } | |
609 | ||
6aabcdff SL |
610 | /* |
611 | * Reconnect serio port (re-initialize attached device). | |
612 | * If reconnect fails (old device is no longer attached or | |
613 | * there was no device to begin with) we do full rescan in | |
614 | * hope of finding a driver for the port. | |
615 | */ | |
616 | static int serio_reconnect_port(struct serio *serio) | |
617 | { | |
618 | int error = serio_reconnect_driver(serio); | |
619 | ||
620 | if (error) { | |
621 | serio_disconnect_port(serio); | |
622 | serio_find_driver(serio); | |
623 | } | |
624 | ||
625 | return error; | |
626 | } | |
627 | ||
1da177e4 LT |
628 | /* |
629 | * Reconnect serio port and all its children (re-initialize attached devices) | |
630 | */ | |
6aabcdff | 631 | static void serio_reconnect_chain(struct serio *serio) |
1da177e4 LT |
632 | { |
633 | do { | |
6aabcdff | 634 | if (serio_reconnect_port(serio)) { |
1da177e4 LT |
635 | /* Ok, old children are now gone, we are done */ |
636 | break; | |
637 | } | |
638 | serio = serio->child; | |
639 | } while (serio); | |
640 | } | |
641 | ||
642 | /* | |
643 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
644 | * all child ports are unbound and destroyed. | |
645 | */ | |
646 | static void serio_disconnect_port(struct serio *serio) | |
647 | { | |
648 | struct serio *s, *parent; | |
649 | ||
650 | if (serio->child) { | |
651 | /* | |
652 | * Children ports should be disconnected and destroyed | |
653 | * first, staring with the leaf one, since we don't want | |
654 | * to do recursion | |
655 | */ | |
656 | for (s = serio; s->child; s = s->child) | |
657 | /* empty */; | |
658 | ||
659 | do { | |
660 | parent = s->parent; | |
661 | ||
70f256fd | 662 | device_release_driver(&s->dev); |
1da177e4 LT |
663 | serio_destroy_port(s); |
664 | } while ((s = parent) != serio); | |
665 | } | |
666 | ||
667 | /* | |
668 | * Ok, no children left, now disconnect this port | |
669 | */ | |
70f256fd | 670 | device_release_driver(&serio->dev); |
1da177e4 LT |
671 | } |
672 | ||
673 | void serio_rescan(struct serio *serio) | |
674 | { | |
ed7b1f6d | 675 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
1da177e4 | 676 | } |
89b09b99 | 677 | EXPORT_SYMBOL(serio_rescan); |
1da177e4 LT |
678 | |
679 | void serio_reconnect(struct serio *serio) | |
680 | { | |
6aabcdff | 681 | serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN); |
1da177e4 | 682 | } |
89b09b99 | 683 | EXPORT_SYMBOL(serio_reconnect); |
1da177e4 LT |
684 | |
685 | /* | |
686 | * Submits register request to kseriod for subsequent execution. | |
687 | * Note that port registration is always asynchronous. | |
688 | */ | |
689 | void __serio_register_port(struct serio *serio, struct module *owner) | |
690 | { | |
691 | serio_init_port(serio); | |
692 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
693 | } | |
89b09b99 | 694 | EXPORT_SYMBOL(__serio_register_port); |
1da177e4 LT |
695 | |
696 | /* | |
697 | * Synchronously unregisters serio port. | |
698 | */ | |
699 | void serio_unregister_port(struct serio *serio) | |
700 | { | |
c4e32e9f | 701 | mutex_lock(&serio_mutex); |
1da177e4 LT |
702 | serio_disconnect_port(serio); |
703 | serio_destroy_port(serio); | |
c4e32e9f | 704 | mutex_unlock(&serio_mutex); |
1da177e4 | 705 | } |
89b09b99 | 706 | EXPORT_SYMBOL(serio_unregister_port); |
1da177e4 | 707 | |
3c803e8e LT |
708 | /* |
709 | * Safely unregisters child port if one is present. | |
710 | */ | |
711 | void serio_unregister_child_port(struct serio *serio) | |
712 | { | |
c4e32e9f | 713 | mutex_lock(&serio_mutex); |
3c803e8e LT |
714 | if (serio->child) { |
715 | serio_disconnect_port(serio->child); | |
716 | serio_destroy_port(serio->child); | |
717 | } | |
c4e32e9f | 718 | mutex_unlock(&serio_mutex); |
3c803e8e | 719 | } |
89b09b99 | 720 | EXPORT_SYMBOL(serio_unregister_child_port); |
3c803e8e | 721 | |
1da177e4 LT |
722 | |
723 | /* | |
724 | * Serio driver operations | |
725 | */ | |
726 | ||
727 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
728 | { | |
729 | struct serio_driver *driver = to_serio_driver(drv); | |
730 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
731 | } | |
732 | ||
733 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
734 | { | |
735 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
736 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
737 | } | |
738 | ||
739 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
740 | { | |
741 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
742 | int retval; | |
743 | ||
744 | retval = count; | |
745 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 746 | serio_drv->manual_bind = true; |
1da177e4 | 747 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 748 | serio_drv->manual_bind = false; |
1da177e4 LT |
749 | } else { |
750 | retval = -EINVAL; | |
751 | } | |
752 | ||
753 | return retval; | |
754 | } | |
755 | ||
756 | ||
757 | static struct driver_attribute serio_driver_attrs[] = { | |
758 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
759 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
760 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
761 | __ATTR_NULL | |
762 | }; | |
763 | ||
764 | static int serio_driver_probe(struct device *dev) | |
765 | { | |
766 | struct serio *serio = to_serio_port(dev); | |
767 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
768 | ||
3c803e8e | 769 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
770 | } |
771 | ||
772 | static int serio_driver_remove(struct device *dev) | |
773 | { | |
774 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 775 | |
3c803e8e | 776 | serio_disconnect_driver(serio); |
1da177e4 LT |
777 | return 0; |
778 | } | |
779 | ||
82dd9eff DT |
780 | static void serio_cleanup(struct serio *serio) |
781 | { | |
33143ea1 | 782 | mutex_lock(&serio->drv_mutex); |
82dd9eff DT |
783 | if (serio->drv && serio->drv->cleanup) |
784 | serio->drv->cleanup(serio); | |
33143ea1 | 785 | mutex_unlock(&serio->drv_mutex); |
82dd9eff DT |
786 | } |
787 | ||
788 | static void serio_shutdown(struct device *dev) | |
789 | { | |
790 | struct serio *serio = to_serio_port(dev); | |
791 | ||
792 | serio_cleanup(serio); | |
793 | } | |
794 | ||
ed7b1f6d | 795 | static void serio_attach_driver(struct serio_driver *drv) |
73b59a3b RD |
796 | { |
797 | int error; | |
798 | ||
ed7b1f6d | 799 | error = driver_attach(&drv->driver); |
73b59a3b | 800 | if (error) |
ed7b1f6d DT |
801 | printk(KERN_WARNING |
802 | "serio: driver_attach() failed for %s with error %d\n", | |
73b59a3b RD |
803 | drv->driver.name, error); |
804 | } | |
805 | ||
4b315627 | 806 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
1da177e4 | 807 | { |
7e044e05 | 808 | bool manual_bind = drv->manual_bind; |
ed7b1f6d DT |
809 | int error; |
810 | ||
1da177e4 | 811 | drv->driver.bus = &serio_bus; |
4b315627 GKH |
812 | drv->driver.owner = owner; |
813 | drv->driver.mod_name = mod_name; | |
1da177e4 | 814 | |
ed7b1f6d DT |
815 | /* |
816 | * Temporarily disable automatic binding because probing | |
817 | * takes long time and we are better off doing it in kseriod | |
818 | */ | |
7e044e05 | 819 | drv->manual_bind = true; |
ed7b1f6d DT |
820 | |
821 | error = driver_register(&drv->driver); | |
822 | if (error) { | |
823 | printk(KERN_ERR | |
824 | "serio: driver_register() failed for %s, error: %d\n", | |
825 | drv->driver.name, error); | |
826 | return error; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Restore original bind mode and let kseriod bind the | |
831 | * driver to free ports | |
832 | */ | |
833 | if (!manual_bind) { | |
7e044e05 | 834 | drv->manual_bind = false; |
ed7b1f6d DT |
835 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
836 | if (error) { | |
837 | driver_unregister(&drv->driver); | |
838 | return error; | |
839 | } | |
840 | } | |
841 | ||
842 | return 0; | |
1da177e4 | 843 | } |
89b09b99 | 844 | EXPORT_SYMBOL(__serio_register_driver); |
1da177e4 LT |
845 | |
846 | void serio_unregister_driver(struct serio_driver *drv) | |
847 | { | |
848 | struct serio *serio; | |
849 | ||
c4e32e9f | 850 | mutex_lock(&serio_mutex); |
e8ef4347 | 851 | |
7e044e05 | 852 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
e8ef4347 | 853 | serio_remove_pending_events(drv); |
1da177e4 LT |
854 | |
855 | start_over: | |
856 | list_for_each_entry(serio, &serio_list, node) { | |
857 | if (serio->drv == drv) { | |
858 | serio_disconnect_port(serio); | |
859 | serio_find_driver(serio); | |
860 | /* we could've deleted some ports, restart */ | |
861 | goto start_over; | |
862 | } | |
863 | } | |
864 | ||
865 | driver_unregister(&drv->driver); | |
c4e32e9f | 866 | mutex_unlock(&serio_mutex); |
1da177e4 | 867 | } |
89b09b99 | 868 | EXPORT_SYMBOL(serio_unregister_driver); |
1da177e4 LT |
869 | |
870 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
871 | { | |
1da177e4 LT |
872 | serio_pause_rx(serio); |
873 | serio->drv = drv; | |
874 | serio_continue_rx(serio); | |
1da177e4 LT |
875 | } |
876 | ||
877 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
878 | { | |
879 | struct serio *serio = to_serio_port(dev); | |
880 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
881 | ||
882 | if (serio->manual_bind || serio_drv->manual_bind) | |
883 | return 0; | |
884 | ||
885 | return serio_match_port(serio_drv->id_table, serio); | |
886 | } | |
887 | ||
888 | #ifdef CONFIG_HOTPLUG | |
889 | ||
312c004d | 890 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 891 | do { \ |
7eff2e7a | 892 | int err = add_uevent_var(env, fmt, val); \ |
ae87dff7 DT |
893 | if (err) \ |
894 | return err; \ | |
895 | } while (0) | |
896 | ||
7eff2e7a | 897 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
898 | { |
899 | struct serio *serio; | |
1da177e4 LT |
900 | |
901 | if (!dev) | |
902 | return -ENODEV; | |
903 | ||
904 | serio = to_serio_port(dev); | |
905 | ||
312c004d KS |
906 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
907 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
908 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
909 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
910 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
ae87dff7 | 911 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 LT |
912 | |
913 | return 0; | |
914 | } | |
312c004d | 915 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 LT |
916 | |
917 | #else | |
918 | ||
7eff2e7a | 919 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
920 | { |
921 | return -ENODEV; | |
922 | } | |
923 | ||
924 | #endif /* CONFIG_HOTPLUG */ | |
925 | ||
82dd9eff | 926 | #ifdef CONFIG_PM |
633aae23 | 927 | static int serio_suspend(struct device *dev) |
82dd9eff | 928 | { |
7e044e05 | 929 | struct serio *serio = to_serio_port(dev); |
82dd9eff | 930 | |
633aae23 | 931 | serio_cleanup(serio); |
82dd9eff DT |
932 | |
933 | return 0; | |
934 | } | |
935 | ||
1da177e4 LT |
936 | static int serio_resume(struct device *dev) |
937 | { | |
7e044e05 DT |
938 | struct serio *serio = to_serio_port(dev); |
939 | ||
6aabcdff SL |
940 | /* |
941 | * Driver reconnect can take a while, so better let kseriod | |
942 | * deal with it. | |
943 | */ | |
633aae23 | 944 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); |
1da177e4 LT |
945 | |
946 | return 0; | |
947 | } | |
633aae23 DT |
948 | |
949 | static const struct dev_pm_ops serio_pm_ops = { | |
950 | .suspend = serio_suspend, | |
951 | .resume = serio_resume, | |
952 | .poweroff = serio_suspend, | |
953 | .restore = serio_resume, | |
954 | }; | |
82dd9eff | 955 | #endif /* CONFIG_PM */ |
1da177e4 | 956 | |
c4e32e9f | 957 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
958 | int serio_open(struct serio *serio, struct serio_driver *drv) |
959 | { | |
960 | serio_set_drv(serio, drv); | |
961 | ||
962 | if (serio->open && serio->open(serio)) { | |
963 | serio_set_drv(serio, NULL); | |
964 | return -1; | |
965 | } | |
966 | return 0; | |
967 | } | |
89b09b99 | 968 | EXPORT_SYMBOL(serio_open); |
1da177e4 | 969 | |
c4e32e9f | 970 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
971 | void serio_close(struct serio *serio) |
972 | { | |
973 | if (serio->close) | |
974 | serio->close(serio); | |
975 | ||
976 | serio_set_drv(serio, NULL); | |
977 | } | |
89b09b99 | 978 | EXPORT_SYMBOL(serio_close); |
1da177e4 LT |
979 | |
980 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 981 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
982 | { |
983 | unsigned long flags; | |
984 | irqreturn_t ret = IRQ_NONE; | |
985 | ||
986 | spin_lock_irqsave(&serio->lock, flags); | |
987 | ||
988 | if (likely(serio->drv)) { | |
7d12e780 | 989 | ret = serio->drv->interrupt(serio, data, dfl); |
1da177e4 LT |
990 | } else if (!dfl && serio->registered) { |
991 | serio_rescan(serio); | |
992 | ret = IRQ_HANDLED; | |
993 | } | |
994 | ||
995 | spin_unlock_irqrestore(&serio->lock, flags); | |
996 | ||
997 | return ret; | |
998 | } | |
89b09b99 | 999 | EXPORT_SYMBOL(serio_interrupt); |
1da177e4 | 1000 | |
1ea2a69d MN |
1001 | static struct bus_type serio_bus = { |
1002 | .name = "serio", | |
1003 | .dev_attrs = serio_device_attrs, | |
1004 | .drv_attrs = serio_driver_attrs, | |
1005 | .match = serio_bus_match, | |
1006 | .uevent = serio_uevent, | |
1007 | .probe = serio_driver_probe, | |
1008 | .remove = serio_driver_remove, | |
82dd9eff DT |
1009 | .shutdown = serio_shutdown, |
1010 | #ifdef CONFIG_PM | |
633aae23 | 1011 | .pm = &serio_pm_ops, |
82dd9eff | 1012 | #endif |
1ea2a69d MN |
1013 | }; |
1014 | ||
1da177e4 LT |
1015 | static int __init serio_init(void) |
1016 | { | |
73b59a3b | 1017 | int error; |
1da177e4 | 1018 | |
73b59a3b RD |
1019 | error = bus_register(&serio_bus); |
1020 | if (error) { | |
1021 | printk(KERN_ERR "serio: failed to register serio bus, error: %d\n", error); | |
1022 | return error; | |
1023 | } | |
1024 | ||
1025 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); | |
1026 | if (IS_ERR(serio_task)) { | |
1027 | bus_unregister(&serio_bus); | |
1028 | error = PTR_ERR(serio_task); | |
1029 | printk(KERN_ERR "serio: Failed to start kseriod, error: %d\n", error); | |
1030 | return error; | |
1031 | } | |
1da177e4 LT |
1032 | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | static void __exit serio_exit(void) | |
1037 | { | |
1038 | bus_unregister(&serio_bus); | |
3c803e8e | 1039 | kthread_stop(serio_task); |
1da177e4 LT |
1040 | } |
1041 | ||
51c38f9b | 1042 | subsys_initcall(serio_init); |
1da177e4 | 1043 | module_exit(serio_exit); |