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 | ||
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 | |
ea486e68 | 278 | while ((event = serio_get_event())) { |
1da177e4 LT |
279 | |
280 | switch (event->type) { | |
1da177e4 | 281 | |
cac9169b DT |
282 | case SERIO_REGISTER_PORT: |
283 | serio_add_port(event->object); | |
284 | break; | |
1da177e4 | 285 | |
cac9169b DT |
286 | case SERIO_RECONNECT_PORT: |
287 | serio_reconnect_port(event->object); | |
288 | break; | |
1da177e4 | 289 | |
cac9169b DT |
290 | case SERIO_RESCAN_PORT: |
291 | serio_disconnect_port(event->object); | |
292 | serio_find_driver(event->object); | |
293 | break; | |
6aabcdff | 294 | |
cac9169b DT |
295 | case SERIO_RECONNECT_CHAIN: |
296 | serio_reconnect_chain(event->object); | |
297 | break; | |
1da177e4 | 298 | |
cac9169b DT |
299 | case SERIO_ATTACH_DRIVER: |
300 | serio_attach_driver(event->object); | |
301 | break; | |
1da177e4 LT |
302 | } |
303 | ||
304 | serio_remove_duplicate_events(event); | |
305 | serio_free_event(event); | |
306 | } | |
307 | ||
c4e32e9f | 308 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
309 | } |
310 | ||
311 | /* | |
e8ef4347 DT |
312 | * Remove all events that have been submitted for a given |
313 | * object, be it serio port or driver. | |
1da177e4 | 314 | */ |
e8ef4347 | 315 | static void serio_remove_pending_events(void *object) |
1da177e4 | 316 | { |
4516c818 | 317 | struct serio_event *event, *next; |
1da177e4 LT |
318 | unsigned long flags; |
319 | ||
320 | spin_lock_irqsave(&serio_event_lock, flags); | |
321 | ||
4516c818 | 322 | list_for_each_entry_safe(event, next, &serio_event_list, node) { |
e8ef4347 | 323 | if (event->object == object) { |
4516c818 | 324 | list_del_init(&event->node); |
1da177e4 LT |
325 | serio_free_event(event); |
326 | } | |
327 | } | |
328 | ||
329 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
330 | } | |
331 | ||
332 | /* | |
333 | * Destroy child serio port (if any) that has not been fully registered yet. | |
334 | * | |
335 | * Note that we rely on the fact that port can have only one child and therefore | |
336 | * only one child registration request can be pending. Additionally, children | |
337 | * are registered by driver's connect() handler so there can't be a grandchild | |
338 | * pending registration together with a child. | |
339 | */ | |
340 | static struct serio *serio_get_pending_child(struct serio *parent) | |
341 | { | |
342 | struct serio_event *event; | |
343 | struct serio *serio, *child = NULL; | |
344 | unsigned long flags; | |
345 | ||
346 | spin_lock_irqsave(&serio_event_lock, flags); | |
347 | ||
348 | list_for_each_entry(event, &serio_event_list, node) { | |
349 | if (event->type == SERIO_REGISTER_PORT) { | |
350 | serio = event->object; | |
351 | if (serio->parent == parent) { | |
352 | child = serio; | |
353 | break; | |
354 | } | |
355 | } | |
356 | } | |
357 | ||
358 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
359 | return child; | |
360 | } | |
361 | ||
362 | static int serio_thread(void *nothing) | |
363 | { | |
1da177e4 | 364 | do { |
9e50afd0 | 365 | serio_handle_event(); |
ea486e68 | 366 | wait_event_interruptible(serio_wait, |
3c803e8e | 367 | kthread_should_stop() || !list_empty(&serio_event_list)); |
3c803e8e | 368 | } while (!kthread_should_stop()); |
1da177e4 | 369 | |
3c803e8e | 370 | return 0; |
1da177e4 LT |
371 | } |
372 | ||
373 | ||
374 | /* | |
375 | * Serio port operations | |
376 | */ | |
377 | ||
e404e274 | 378 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
379 | { |
380 | struct serio *serio = to_serio_port(dev); | |
381 | return sprintf(buf, "%s\n", serio->name); | |
382 | } | |
383 | ||
ae87dff7 DT |
384 | static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) |
385 | { | |
386 | struct serio *serio = to_serio_port(dev); | |
387 | ||
388 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
389 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
390 | } | |
391 | ||
e404e274 | 392 | static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
393 | { |
394 | struct serio *serio = to_serio_port(dev); | |
395 | return sprintf(buf, "%02x\n", serio->id.type); | |
396 | } | |
397 | ||
e404e274 | 398 | static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
399 | { |
400 | struct serio *serio = to_serio_port(dev); | |
401 | return sprintf(buf, "%02x\n", serio->id.proto); | |
402 | } | |
403 | ||
e404e274 | 404 | static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
405 | { |
406 | struct serio *serio = to_serio_port(dev); | |
407 | return sprintf(buf, "%02x\n", serio->id.id); | |
408 | } | |
409 | ||
e404e274 | 410 | static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
411 | { |
412 | struct serio *serio = to_serio_port(dev); | |
413 | return sprintf(buf, "%02x\n", serio->id.extra); | |
414 | } | |
415 | ||
baae9561 DT |
416 | static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL); |
417 | static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL); | |
418 | static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL); | |
419 | static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL); | |
420 | ||
421 | static struct attribute *serio_device_id_attrs[] = { | |
422 | &dev_attr_type.attr, | |
423 | &dev_attr_proto.attr, | |
424 | &dev_attr_id.attr, | |
425 | &dev_attr_extra.attr, | |
426 | NULL | |
427 | }; | |
428 | ||
429 | static struct attribute_group serio_id_attr_group = { | |
430 | .name = "id", | |
431 | .attrs = serio_device_id_attrs, | |
432 | }; | |
433 | ||
386d8772 DT |
434 | static const struct attribute_group *serio_device_attr_groups[] = { |
435 | &serio_id_attr_group, | |
436 | NULL | |
437 | }; | |
438 | ||
e404e274 | 439 | static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
440 | { |
441 | struct serio *serio = to_serio_port(dev); | |
442 | struct device_driver *drv; | |
70f256fd | 443 | int error; |
1da177e4 | 444 | |
70f256fd DT |
445 | error = mutex_lock_interruptible(&serio_mutex); |
446 | if (error) | |
447 | return error; | |
1da177e4 | 448 | |
1da177e4 LT |
449 | if (!strncmp(buf, "none", count)) { |
450 | serio_disconnect_port(serio); | |
451 | } else if (!strncmp(buf, "reconnect", count)) { | |
6aabcdff | 452 | serio_reconnect_chain(serio); |
1da177e4 LT |
453 | } else if (!strncmp(buf, "rescan", count)) { |
454 | serio_disconnect_port(serio); | |
455 | serio_find_driver(serio); | |
456 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { | |
457 | serio_disconnect_port(serio); | |
70f256fd | 458 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
1da177e4 LT |
459 | put_driver(drv); |
460 | } else { | |
70f256fd | 461 | error = -EINVAL; |
1da177e4 LT |
462 | } |
463 | ||
c4e32e9f | 464 | mutex_unlock(&serio_mutex); |
1da177e4 | 465 | |
70f256fd | 466 | return error ? error : count; |
1da177e4 LT |
467 | } |
468 | ||
e404e274 | 469 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
470 | { |
471 | struct serio *serio = to_serio_port(dev); | |
472 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
473 | } | |
474 | ||
e404e274 | 475 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
476 | { |
477 | struct serio *serio = to_serio_port(dev); | |
478 | int retval; | |
479 | ||
480 | retval = count; | |
481 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 482 | serio->manual_bind = true; |
1da177e4 | 483 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 484 | serio->manual_bind = false; |
1da177e4 LT |
485 | } else { |
486 | retval = -EINVAL; | |
487 | } | |
488 | ||
489 | return retval; | |
490 | } | |
491 | ||
492 | static struct device_attribute serio_device_attrs[] = { | |
493 | __ATTR(description, S_IRUGO, serio_show_description, NULL), | |
ae87dff7 | 494 | __ATTR(modalias, S_IRUGO, serio_show_modalias, NULL), |
1da177e4 LT |
495 | __ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver), |
496 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode), | |
497 | __ATTR_NULL | |
498 | }; | |
499 | ||
500 | ||
501 | static void serio_release_port(struct device *dev) | |
502 | { | |
503 | struct serio *serio = to_serio_port(dev); | |
504 | ||
505 | kfree(serio); | |
506 | module_put(THIS_MODULE); | |
507 | } | |
508 | ||
509 | /* | |
510 | * Prepare serio port for registration. | |
511 | */ | |
512 | static void serio_init_port(struct serio *serio) | |
513 | { | |
514 | static atomic_t serio_no = ATOMIC_INIT(0); | |
515 | ||
516 | __module_get(THIS_MODULE); | |
517 | ||
73b59a3b | 518 | INIT_LIST_HEAD(&serio->node); |
1da177e4 | 519 | spin_lock_init(&serio->lock); |
c4e32e9f | 520 | mutex_init(&serio->drv_mutex); |
1da177e4 | 521 | device_initialize(&serio->dev); |
a6c2490f KS |
522 | dev_set_name(&serio->dev, "serio%ld", |
523 | (long)atomic_inc_return(&serio_no) - 1); | |
1da177e4 LT |
524 | serio->dev.bus = &serio_bus; |
525 | serio->dev.release = serio_release_port; | |
386d8772 | 526 | serio->dev.groups = serio_device_attr_groups; |
88aa0103 | 527 | if (serio->parent) { |
1da177e4 | 528 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
529 | serio->depth = serio->parent->depth + 1; |
530 | } else | |
531 | serio->depth = 0; | |
532 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
533 | } |
534 | ||
535 | /* | |
536 | * Complete serio port registration. | |
537 | * Driver core will attempt to find appropriate driver for the port. | |
538 | */ | |
539 | static void serio_add_port(struct serio *serio) | |
540 | { | |
73b59a3b RD |
541 | int error; |
542 | ||
1da177e4 LT |
543 | if (serio->parent) { |
544 | serio_pause_rx(serio->parent); | |
545 | serio->parent->child = serio; | |
546 | serio_continue_rx(serio->parent); | |
547 | } | |
548 | ||
549 | list_add_tail(&serio->node, &serio_list); | |
386d8772 | 550 | |
1da177e4 LT |
551 | if (serio->start) |
552 | serio->start(serio); | |
386d8772 | 553 | |
73b59a3b RD |
554 | error = device_add(&serio->dev); |
555 | if (error) | |
cac9169b DT |
556 | dev_err(&serio->dev, |
557 | "device_add() failed for %s (%s), error: %d\n", | |
73b59a3b | 558 | serio->phys, serio->name, error); |
1da177e4 LT |
559 | } |
560 | ||
561 | /* | |
562 | * serio_destroy_port() completes deregistration process and removes | |
563 | * port from the system | |
564 | */ | |
565 | static void serio_destroy_port(struct serio *serio) | |
566 | { | |
567 | struct serio *child; | |
568 | ||
569 | child = serio_get_pending_child(serio); | |
570 | if (child) { | |
571 | serio_remove_pending_events(child); | |
572 | put_device(&child->dev); | |
573 | } | |
574 | ||
575 | if (serio->stop) | |
576 | serio->stop(serio); | |
577 | ||
578 | if (serio->parent) { | |
579 | serio_pause_rx(serio->parent); | |
580 | serio->parent->child = NULL; | |
581 | serio_continue_rx(serio->parent); | |
582 | serio->parent = NULL; | |
583 | } | |
584 | ||
ddf1ffbd | 585 | if (device_is_registered(&serio->dev)) |
1da177e4 | 586 | device_del(&serio->dev); |
1da177e4 | 587 | |
73b59a3b | 588 | list_del_init(&serio->node); |
1da177e4 LT |
589 | serio_remove_pending_events(serio); |
590 | put_device(&serio->dev); | |
591 | } | |
592 | ||
6aabcdff SL |
593 | /* |
594 | * Reconnect serio port (re-initialize attached device). | |
595 | * If reconnect fails (old device is no longer attached or | |
596 | * there was no device to begin with) we do full rescan in | |
597 | * hope of finding a driver for the port. | |
598 | */ | |
599 | static int serio_reconnect_port(struct serio *serio) | |
600 | { | |
601 | int error = serio_reconnect_driver(serio); | |
602 | ||
603 | if (error) { | |
604 | serio_disconnect_port(serio); | |
605 | serio_find_driver(serio); | |
606 | } | |
607 | ||
608 | return error; | |
609 | } | |
610 | ||
1da177e4 LT |
611 | /* |
612 | * Reconnect serio port and all its children (re-initialize attached devices) | |
613 | */ | |
6aabcdff | 614 | static void serio_reconnect_chain(struct serio *serio) |
1da177e4 LT |
615 | { |
616 | do { | |
6aabcdff | 617 | if (serio_reconnect_port(serio)) { |
1da177e4 LT |
618 | /* Ok, old children are now gone, we are done */ |
619 | break; | |
620 | } | |
621 | serio = serio->child; | |
622 | } while (serio); | |
623 | } | |
624 | ||
625 | /* | |
626 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
627 | * all child ports are unbound and destroyed. | |
628 | */ | |
629 | static void serio_disconnect_port(struct serio *serio) | |
630 | { | |
631 | struct serio *s, *parent; | |
632 | ||
633 | if (serio->child) { | |
634 | /* | |
635 | * Children ports should be disconnected and destroyed | |
636 | * first, staring with the leaf one, since we don't want | |
637 | * to do recursion | |
638 | */ | |
639 | for (s = serio; s->child; s = s->child) | |
640 | /* empty */; | |
641 | ||
642 | do { | |
643 | parent = s->parent; | |
644 | ||
70f256fd | 645 | device_release_driver(&s->dev); |
1da177e4 LT |
646 | serio_destroy_port(s); |
647 | } while ((s = parent) != serio); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Ok, no children left, now disconnect this port | |
652 | */ | |
70f256fd | 653 | device_release_driver(&serio->dev); |
1da177e4 LT |
654 | } |
655 | ||
656 | void serio_rescan(struct serio *serio) | |
657 | { | |
ed7b1f6d | 658 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
1da177e4 | 659 | } |
89b09b99 | 660 | EXPORT_SYMBOL(serio_rescan); |
1da177e4 LT |
661 | |
662 | void serio_reconnect(struct serio *serio) | |
663 | { | |
6aabcdff | 664 | serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN); |
1da177e4 | 665 | } |
89b09b99 | 666 | EXPORT_SYMBOL(serio_reconnect); |
1da177e4 LT |
667 | |
668 | /* | |
669 | * Submits register request to kseriod for subsequent execution. | |
670 | * Note that port registration is always asynchronous. | |
671 | */ | |
672 | void __serio_register_port(struct serio *serio, struct module *owner) | |
673 | { | |
674 | serio_init_port(serio); | |
675 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
676 | } | |
89b09b99 | 677 | EXPORT_SYMBOL(__serio_register_port); |
1da177e4 LT |
678 | |
679 | /* | |
680 | * Synchronously unregisters serio port. | |
681 | */ | |
682 | void serio_unregister_port(struct serio *serio) | |
683 | { | |
c4e32e9f | 684 | mutex_lock(&serio_mutex); |
1da177e4 LT |
685 | serio_disconnect_port(serio); |
686 | serio_destroy_port(serio); | |
c4e32e9f | 687 | mutex_unlock(&serio_mutex); |
1da177e4 | 688 | } |
89b09b99 | 689 | EXPORT_SYMBOL(serio_unregister_port); |
1da177e4 | 690 | |
3c803e8e LT |
691 | /* |
692 | * Safely unregisters child port if one is present. | |
693 | */ | |
694 | void serio_unregister_child_port(struct serio *serio) | |
695 | { | |
c4e32e9f | 696 | mutex_lock(&serio_mutex); |
3c803e8e LT |
697 | if (serio->child) { |
698 | serio_disconnect_port(serio->child); | |
699 | serio_destroy_port(serio->child); | |
700 | } | |
c4e32e9f | 701 | mutex_unlock(&serio_mutex); |
3c803e8e | 702 | } |
89b09b99 | 703 | EXPORT_SYMBOL(serio_unregister_child_port); |
3c803e8e | 704 | |
1da177e4 LT |
705 | |
706 | /* | |
707 | * Serio driver operations | |
708 | */ | |
709 | ||
710 | static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf) | |
711 | { | |
712 | struct serio_driver *driver = to_serio_driver(drv); | |
713 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
714 | } | |
715 | ||
716 | static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf) | |
717 | { | |
718 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
719 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
720 | } | |
721 | ||
722 | static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count) | |
723 | { | |
724 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
725 | int retval; | |
726 | ||
727 | retval = count; | |
728 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 729 | serio_drv->manual_bind = true; |
1da177e4 | 730 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 731 | serio_drv->manual_bind = false; |
1da177e4 LT |
732 | } else { |
733 | retval = -EINVAL; | |
734 | } | |
735 | ||
736 | return retval; | |
737 | } | |
738 | ||
739 | ||
740 | static struct driver_attribute serio_driver_attrs[] = { | |
741 | __ATTR(description, S_IRUGO, serio_driver_show_description, NULL), | |
742 | __ATTR(bind_mode, S_IWUSR | S_IRUGO, | |
743 | serio_driver_show_bind_mode, serio_driver_set_bind_mode), | |
744 | __ATTR_NULL | |
745 | }; | |
746 | ||
747 | static int serio_driver_probe(struct device *dev) | |
748 | { | |
749 | struct serio *serio = to_serio_port(dev); | |
750 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
751 | ||
3c803e8e | 752 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
753 | } |
754 | ||
755 | static int serio_driver_remove(struct device *dev) | |
756 | { | |
757 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 758 | |
3c803e8e | 759 | serio_disconnect_driver(serio); |
1da177e4 LT |
760 | return 0; |
761 | } | |
762 | ||
82dd9eff DT |
763 | static void serio_cleanup(struct serio *serio) |
764 | { | |
33143ea1 | 765 | mutex_lock(&serio->drv_mutex); |
82dd9eff DT |
766 | if (serio->drv && serio->drv->cleanup) |
767 | serio->drv->cleanup(serio); | |
33143ea1 | 768 | mutex_unlock(&serio->drv_mutex); |
82dd9eff DT |
769 | } |
770 | ||
771 | static void serio_shutdown(struct device *dev) | |
772 | { | |
773 | struct serio *serio = to_serio_port(dev); | |
774 | ||
775 | serio_cleanup(serio); | |
776 | } | |
777 | ||
ed7b1f6d | 778 | static void serio_attach_driver(struct serio_driver *drv) |
73b59a3b RD |
779 | { |
780 | int error; | |
781 | ||
ed7b1f6d | 782 | error = driver_attach(&drv->driver); |
73b59a3b | 783 | if (error) |
cac9169b DT |
784 | pr_warning("driver_attach() failed for %s with error %d\n", |
785 | drv->driver.name, error); | |
73b59a3b RD |
786 | } |
787 | ||
4b315627 | 788 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
1da177e4 | 789 | { |
7e044e05 | 790 | bool manual_bind = drv->manual_bind; |
ed7b1f6d DT |
791 | int error; |
792 | ||
1da177e4 | 793 | drv->driver.bus = &serio_bus; |
4b315627 GKH |
794 | drv->driver.owner = owner; |
795 | drv->driver.mod_name = mod_name; | |
1da177e4 | 796 | |
ed7b1f6d DT |
797 | /* |
798 | * Temporarily disable automatic binding because probing | |
799 | * takes long time and we are better off doing it in kseriod | |
800 | */ | |
7e044e05 | 801 | drv->manual_bind = true; |
ed7b1f6d DT |
802 | |
803 | error = driver_register(&drv->driver); | |
804 | if (error) { | |
cac9169b | 805 | pr_err("driver_register() failed for %s, error: %d\n", |
ed7b1f6d DT |
806 | drv->driver.name, error); |
807 | return error; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Restore original bind mode and let kseriod bind the | |
812 | * driver to free ports | |
813 | */ | |
814 | if (!manual_bind) { | |
7e044e05 | 815 | drv->manual_bind = false; |
ed7b1f6d DT |
816 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
817 | if (error) { | |
818 | driver_unregister(&drv->driver); | |
819 | return error; | |
820 | } | |
821 | } | |
822 | ||
823 | return 0; | |
1da177e4 | 824 | } |
89b09b99 | 825 | EXPORT_SYMBOL(__serio_register_driver); |
1da177e4 LT |
826 | |
827 | void serio_unregister_driver(struct serio_driver *drv) | |
828 | { | |
829 | struct serio *serio; | |
830 | ||
c4e32e9f | 831 | mutex_lock(&serio_mutex); |
e8ef4347 | 832 | |
7e044e05 | 833 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
e8ef4347 | 834 | serio_remove_pending_events(drv); |
1da177e4 LT |
835 | |
836 | start_over: | |
837 | list_for_each_entry(serio, &serio_list, node) { | |
838 | if (serio->drv == drv) { | |
839 | serio_disconnect_port(serio); | |
840 | serio_find_driver(serio); | |
841 | /* we could've deleted some ports, restart */ | |
842 | goto start_over; | |
843 | } | |
844 | } | |
845 | ||
846 | driver_unregister(&drv->driver); | |
c4e32e9f | 847 | mutex_unlock(&serio_mutex); |
1da177e4 | 848 | } |
89b09b99 | 849 | EXPORT_SYMBOL(serio_unregister_driver); |
1da177e4 LT |
850 | |
851 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
852 | { | |
1da177e4 LT |
853 | serio_pause_rx(serio); |
854 | serio->drv = drv; | |
855 | serio_continue_rx(serio); | |
1da177e4 LT |
856 | } |
857 | ||
858 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
859 | { | |
860 | struct serio *serio = to_serio_port(dev); | |
861 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
862 | ||
863 | if (serio->manual_bind || serio_drv->manual_bind) | |
864 | return 0; | |
865 | ||
866 | return serio_match_port(serio_drv->id_table, serio); | |
867 | } | |
868 | ||
869 | #ifdef CONFIG_HOTPLUG | |
870 | ||
312c004d | 871 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 872 | do { \ |
7eff2e7a | 873 | int err = add_uevent_var(env, fmt, val); \ |
ae87dff7 DT |
874 | if (err) \ |
875 | return err; \ | |
876 | } while (0) | |
877 | ||
7eff2e7a | 878 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
879 | { |
880 | struct serio *serio; | |
1da177e4 LT |
881 | |
882 | if (!dev) | |
883 | return -ENODEV; | |
884 | ||
885 | serio = to_serio_port(dev); | |
886 | ||
312c004d KS |
887 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
888 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
889 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
890 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
891 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", | |
ae87dff7 | 892 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 LT |
893 | |
894 | return 0; | |
895 | } | |
312c004d | 896 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 LT |
897 | |
898 | #else | |
899 | ||
7eff2e7a | 900 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
901 | { |
902 | return -ENODEV; | |
903 | } | |
904 | ||
905 | #endif /* CONFIG_HOTPLUG */ | |
906 | ||
82dd9eff | 907 | #ifdef CONFIG_PM |
633aae23 | 908 | static int serio_suspend(struct device *dev) |
82dd9eff | 909 | { |
7e044e05 | 910 | struct serio *serio = to_serio_port(dev); |
82dd9eff | 911 | |
633aae23 | 912 | serio_cleanup(serio); |
82dd9eff DT |
913 | |
914 | return 0; | |
915 | } | |
916 | ||
1da177e4 LT |
917 | static int serio_resume(struct device *dev) |
918 | { | |
7e044e05 DT |
919 | struct serio *serio = to_serio_port(dev); |
920 | ||
6aabcdff SL |
921 | /* |
922 | * Driver reconnect can take a while, so better let kseriod | |
923 | * deal with it. | |
924 | */ | |
633aae23 | 925 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); |
1da177e4 LT |
926 | |
927 | return 0; | |
928 | } | |
633aae23 DT |
929 | |
930 | static const struct dev_pm_ops serio_pm_ops = { | |
931 | .suspend = serio_suspend, | |
932 | .resume = serio_resume, | |
933 | .poweroff = serio_suspend, | |
934 | .restore = serio_resume, | |
935 | }; | |
82dd9eff | 936 | #endif /* CONFIG_PM */ |
1da177e4 | 937 | |
c4e32e9f | 938 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
939 | int serio_open(struct serio *serio, struct serio_driver *drv) |
940 | { | |
941 | serio_set_drv(serio, drv); | |
942 | ||
943 | if (serio->open && serio->open(serio)) { | |
944 | serio_set_drv(serio, NULL); | |
945 | return -1; | |
946 | } | |
947 | return 0; | |
948 | } | |
89b09b99 | 949 | EXPORT_SYMBOL(serio_open); |
1da177e4 | 950 | |
c4e32e9f | 951 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
952 | void serio_close(struct serio *serio) |
953 | { | |
954 | if (serio->close) | |
955 | serio->close(serio); | |
956 | ||
957 | serio_set_drv(serio, NULL); | |
958 | } | |
89b09b99 | 959 | EXPORT_SYMBOL(serio_close); |
1da177e4 LT |
960 | |
961 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 962 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
963 | { |
964 | unsigned long flags; | |
965 | irqreturn_t ret = IRQ_NONE; | |
966 | ||
967 | spin_lock_irqsave(&serio->lock, flags); | |
968 | ||
969 | if (likely(serio->drv)) { | |
7d12e780 | 970 | ret = serio->drv->interrupt(serio, data, dfl); |
ddf1ffbd | 971 | } else if (!dfl && device_is_registered(&serio->dev)) { |
1da177e4 LT |
972 | serio_rescan(serio); |
973 | ret = IRQ_HANDLED; | |
974 | } | |
975 | ||
976 | spin_unlock_irqrestore(&serio->lock, flags); | |
977 | ||
978 | return ret; | |
979 | } | |
89b09b99 | 980 | EXPORT_SYMBOL(serio_interrupt); |
1da177e4 | 981 | |
1ea2a69d MN |
982 | static struct bus_type serio_bus = { |
983 | .name = "serio", | |
984 | .dev_attrs = serio_device_attrs, | |
985 | .drv_attrs = serio_driver_attrs, | |
986 | .match = serio_bus_match, | |
987 | .uevent = serio_uevent, | |
988 | .probe = serio_driver_probe, | |
989 | .remove = serio_driver_remove, | |
82dd9eff DT |
990 | .shutdown = serio_shutdown, |
991 | #ifdef CONFIG_PM | |
633aae23 | 992 | .pm = &serio_pm_ops, |
82dd9eff | 993 | #endif |
1ea2a69d MN |
994 | }; |
995 | ||
1da177e4 LT |
996 | static int __init serio_init(void) |
997 | { | |
73b59a3b | 998 | int error; |
1da177e4 | 999 | |
73b59a3b RD |
1000 | error = bus_register(&serio_bus); |
1001 | if (error) { | |
cac9169b | 1002 | pr_err("Failed to register serio bus, error: %d\n", error); |
73b59a3b RD |
1003 | return error; |
1004 | } | |
1005 | ||
1006 | serio_task = kthread_run(serio_thread, NULL, "kseriod"); | |
1007 | if (IS_ERR(serio_task)) { | |
1008 | bus_unregister(&serio_bus); | |
1009 | error = PTR_ERR(serio_task); | |
cac9169b | 1010 | pr_err("Failed to start kseriod, error: %d\n", error); |
73b59a3b RD |
1011 | return error; |
1012 | } | |
1da177e4 LT |
1013 | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static void __exit serio_exit(void) | |
1018 | { | |
1019 | bus_unregister(&serio_bus); | |
3c803e8e | 1020 | kthread_stop(serio_task); |
1da177e4 LT |
1021 | } |
1022 | ||
51c38f9b | 1023 | subsys_initcall(serio_init); |
1da177e4 | 1024 | module_exit(serio_exit); |