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 | |
1da177e4 LT |
23 | */ |
24 | ||
cac9169b DT |
25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
26 | ||
1da177e4 LT |
27 | #include <linux/stddef.h> |
28 | #include <linux/module.h> | |
29 | #include <linux/serio.h> | |
30 | #include <linux/errno.h> | |
1da177e4 | 31 | #include <linux/sched.h> |
1da177e4 | 32 | #include <linux/slab.h> |
8ee294cd | 33 | #include <linux/workqueue.h> |
c4e32e9f | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | |
36 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
37 | MODULE_DESCRIPTION("Serio abstraction core"); | |
38 | MODULE_LICENSE("GPL"); | |
39 | ||
1da177e4 | 40 | /* |
c4e32e9f | 41 | * serio_mutex protects entire serio subsystem and is taken every time |
8ee294cd | 42 | * serio port or driver registered or unregistered. |
1da177e4 | 43 | */ |
c4e32e9f | 44 | static DEFINE_MUTEX(serio_mutex); |
1da177e4 LT |
45 | |
46 | static LIST_HEAD(serio_list); | |
47 | ||
1da177e4 | 48 | static void serio_add_port(struct serio *serio); |
6aabcdff | 49 | static int serio_reconnect_port(struct serio *serio); |
1da177e4 | 50 | static void serio_disconnect_port(struct serio *serio); |
09822582 | 51 | static void serio_reconnect_subtree(struct serio *serio); |
ed7b1f6d | 52 | static void serio_attach_driver(struct serio_driver *drv); |
1da177e4 | 53 | |
3c803e8e LT |
54 | static int serio_connect_driver(struct serio *serio, struct serio_driver *drv) |
55 | { | |
56 | int retval; | |
57 | ||
c4e32e9f | 58 | mutex_lock(&serio->drv_mutex); |
3c803e8e | 59 | retval = drv->connect(serio, drv); |
c4e32e9f | 60 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
61 | |
62 | return retval; | |
63 | } | |
64 | ||
65 | static int serio_reconnect_driver(struct serio *serio) | |
66 | { | |
67 | int retval = -1; | |
68 | ||
c4e32e9f | 69 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
70 | if (serio->drv && serio->drv->reconnect) |
71 | retval = serio->drv->reconnect(serio); | |
c4e32e9f | 72 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
73 | |
74 | return retval; | |
75 | } | |
76 | ||
77 | static void serio_disconnect_driver(struct serio *serio) | |
78 | { | |
c4e32e9f | 79 | mutex_lock(&serio->drv_mutex); |
3c803e8e LT |
80 | if (serio->drv) |
81 | serio->drv->disconnect(serio); | |
c4e32e9f | 82 | mutex_unlock(&serio->drv_mutex); |
3c803e8e LT |
83 | } |
84 | ||
1da177e4 LT |
85 | static int serio_match_port(const struct serio_device_id *ids, struct serio *serio) |
86 | { | |
87 | while (ids->type || ids->proto) { | |
88 | if ((ids->type == SERIO_ANY || ids->type == serio->id.type) && | |
89 | (ids->proto == SERIO_ANY || ids->proto == serio->id.proto) && | |
90 | (ids->extra == SERIO_ANY || ids->extra == serio->id.extra) && | |
91 | (ids->id == SERIO_ANY || ids->id == serio->id.id)) | |
92 | return 1; | |
93 | ids++; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Basic serio -> driver core mappings | |
100 | */ | |
101 | ||
70f256fd | 102 | static int serio_bind_driver(struct serio *serio, struct serio_driver *drv) |
1da177e4 | 103 | { |
0a66045b DT |
104 | int error; |
105 | ||
1da177e4 | 106 | if (serio_match_port(drv->id_table, serio)) { |
70f256fd | 107 | |
1da177e4 | 108 | serio->dev.driver = &drv->driver; |
3c803e8e | 109 | if (serio_connect_driver(serio, drv)) { |
1da177e4 | 110 | serio->dev.driver = NULL; |
70f256fd | 111 | return -ENODEV; |
1da177e4 | 112 | } |
70f256fd | 113 | |
0a66045b DT |
114 | error = device_bind_driver(&serio->dev); |
115 | if (error) { | |
cac9169b DT |
116 | dev_warn(&serio->dev, |
117 | "device_bind_driver() failed for %s (%s) and %s, error: %d\n", | |
118 | serio->phys, serio->name, | |
119 | drv->description, error); | |
0a66045b DT |
120 | serio_disconnect_driver(serio); |
121 | serio->dev.driver = NULL; | |
70f256fd | 122 | return error; |
0a66045b | 123 | } |
1da177e4 | 124 | } |
70f256fd | 125 | return 0; |
1da177e4 LT |
126 | } |
127 | ||
128 | static void serio_find_driver(struct serio *serio) | |
129 | { | |
73b59a3b RD |
130 | int error; |
131 | ||
73b59a3b | 132 | error = device_attach(&serio->dev); |
015bb5e1 | 133 | if (error < 0 && error != -EPROBE_DEFER) |
cac9169b DT |
134 | dev_warn(&serio->dev, |
135 | "device_attach() failed for %s (%s), error: %d\n", | |
136 | serio->phys, serio->name, error); | |
1da177e4 LT |
137 | } |
138 | ||
139 | ||
140 | /* | |
141 | * Serio event processing. | |
142 | */ | |
143 | ||
144 | enum serio_event_type { | |
ed7b1f6d DT |
145 | SERIO_RESCAN_PORT, |
146 | SERIO_RECONNECT_PORT, | |
09822582 | 147 | SERIO_RECONNECT_SUBTREE, |
1da177e4 | 148 | SERIO_REGISTER_PORT, |
ed7b1f6d | 149 | SERIO_ATTACH_DRIVER, |
1da177e4 LT |
150 | }; |
151 | ||
152 | struct serio_event { | |
153 | enum serio_event_type type; | |
154 | void *object; | |
155 | struct module *owner; | |
156 | struct list_head node; | |
157 | }; | |
158 | ||
159 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
160 | static LIST_HEAD(serio_event_list); | |
1da177e4 | 161 | |
8ee294cd | 162 | static struct serio_event *serio_get_event(void) |
1da177e4 | 163 | { |
8ee294cd | 164 | struct serio_event *event = NULL; |
1da177e4 | 165 | unsigned long flags; |
1da177e4 LT |
166 | |
167 | spin_lock_irqsave(&serio_event_lock, flags); | |
168 | ||
8ee294cd DT |
169 | if (!list_empty(&serio_event_list)) { |
170 | event = list_first_entry(&serio_event_list, | |
171 | struct serio_event, node); | |
172 | list_del_init(&event->node); | |
1da177e4 | 173 | } |
ed7b1f6d | 174 | |
1da177e4 | 175 | spin_unlock_irqrestore(&serio_event_lock, flags); |
8ee294cd | 176 | return event; |
1da177e4 LT |
177 | } |
178 | ||
179 | static void serio_free_event(struct serio_event *event) | |
180 | { | |
181 | module_put(event->owner); | |
182 | kfree(event); | |
183 | } | |
184 | ||
19e95541 DL |
185 | static void serio_remove_duplicate_events(void *object, |
186 | enum serio_event_type type) | |
1da177e4 | 187 | { |
4516c818 | 188 | struct serio_event *e, *next; |
1da177e4 LT |
189 | unsigned long flags; |
190 | ||
191 | spin_lock_irqsave(&serio_event_lock, flags); | |
192 | ||
4516c818 | 193 | list_for_each_entry_safe(e, next, &serio_event_list, node) { |
19e95541 | 194 | if (object == e->object) { |
1da177e4 LT |
195 | /* |
196 | * If this event is of different type we should not | |
197 | * look further - we only suppress duplicate events | |
198 | * that were sent back-to-back. | |
199 | */ | |
19e95541 | 200 | if (type != e->type) |
1da177e4 LT |
201 | break; |
202 | ||
4516c818 | 203 | list_del_init(&e->node); |
1da177e4 LT |
204 | serio_free_event(e); |
205 | } | |
206 | } | |
207 | ||
208 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
209 | } | |
210 | ||
8ee294cd | 211 | static void serio_handle_event(struct work_struct *work) |
1da177e4 LT |
212 | { |
213 | struct serio_event *event; | |
1da177e4 | 214 | |
c4e32e9f | 215 | mutex_lock(&serio_mutex); |
1da177e4 | 216 | |
ea486e68 | 217 | while ((event = serio_get_event())) { |
1da177e4 LT |
218 | |
219 | switch (event->type) { | |
1da177e4 | 220 | |
cac9169b DT |
221 | case SERIO_REGISTER_PORT: |
222 | serio_add_port(event->object); | |
223 | break; | |
1da177e4 | 224 | |
cac9169b DT |
225 | case SERIO_RECONNECT_PORT: |
226 | serio_reconnect_port(event->object); | |
227 | break; | |
1da177e4 | 228 | |
cac9169b DT |
229 | case SERIO_RESCAN_PORT: |
230 | serio_disconnect_port(event->object); | |
231 | serio_find_driver(event->object); | |
232 | break; | |
6aabcdff | 233 | |
09822582 DES |
234 | case SERIO_RECONNECT_SUBTREE: |
235 | serio_reconnect_subtree(event->object); | |
cac9169b | 236 | break; |
1da177e4 | 237 | |
cac9169b DT |
238 | case SERIO_ATTACH_DRIVER: |
239 | serio_attach_driver(event->object); | |
240 | break; | |
1da177e4 LT |
241 | } |
242 | ||
19e95541 | 243 | serio_remove_duplicate_events(event->object, event->type); |
1da177e4 LT |
244 | serio_free_event(event); |
245 | } | |
246 | ||
c4e32e9f | 247 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
248 | } |
249 | ||
8ee294cd DT |
250 | static DECLARE_WORK(serio_event_work, serio_handle_event); |
251 | ||
252 | static int serio_queue_event(void *object, struct module *owner, | |
253 | enum serio_event_type event_type) | |
254 | { | |
255 | unsigned long flags; | |
256 | struct serio_event *event; | |
257 | int retval = 0; | |
258 | ||
259 | spin_lock_irqsave(&serio_event_lock, flags); | |
260 | ||
261 | /* | |
262 | * Scan event list for the other events for the same serio port, | |
263 | * starting with the most recent one. If event is the same we | |
264 | * do not need add new one. If event is of different type we | |
265 | * need to add this event and should not look further because | |
266 | * we need to preseve sequence of distinct events. | |
267 | */ | |
268 | list_for_each_entry_reverse(event, &serio_event_list, node) { | |
269 | if (event->object == object) { | |
270 | if (event->type == event_type) | |
271 | goto out; | |
272 | break; | |
273 | } | |
274 | } | |
275 | ||
276 | event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); | |
277 | if (!event) { | |
278 | pr_err("Not enough memory to queue event %d\n", event_type); | |
279 | retval = -ENOMEM; | |
280 | goto out; | |
281 | } | |
282 | ||
283 | if (!try_module_get(owner)) { | |
fef5f569 JP |
284 | pr_warn("Can't get module reference, dropping event %d\n", |
285 | event_type); | |
8ee294cd DT |
286 | kfree(event); |
287 | retval = -EINVAL; | |
288 | goto out; | |
289 | } | |
290 | ||
291 | event->type = event_type; | |
292 | event->object = object; | |
293 | event->owner = owner; | |
294 | ||
295 | list_add_tail(&event->node, &serio_event_list); | |
1d64b655 | 296 | queue_work(system_long_wq, &serio_event_work); |
8ee294cd DT |
297 | |
298 | out: | |
299 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
300 | return retval; | |
301 | } | |
302 | ||
1da177e4 | 303 | /* |
e8ef4347 DT |
304 | * Remove all events that have been submitted for a given |
305 | * object, be it serio port or driver. | |
1da177e4 | 306 | */ |
e8ef4347 | 307 | static void serio_remove_pending_events(void *object) |
1da177e4 | 308 | { |
4516c818 | 309 | struct serio_event *event, *next; |
1da177e4 LT |
310 | unsigned long flags; |
311 | ||
312 | spin_lock_irqsave(&serio_event_lock, flags); | |
313 | ||
4516c818 | 314 | list_for_each_entry_safe(event, next, &serio_event_list, node) { |
e8ef4347 | 315 | if (event->object == object) { |
4516c818 | 316 | list_del_init(&event->node); |
1da177e4 LT |
317 | serio_free_event(event); |
318 | } | |
319 | } | |
320 | ||
321 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
322 | } | |
323 | ||
324 | /* | |
09822582 | 325 | * Locate child serio port (if any) that has not been fully registered yet. |
1da177e4 | 326 | * |
09822582 DES |
327 | * Children are registered by driver's connect() handler so there can't be a |
328 | * grandchild pending registration together with a child. | |
1da177e4 LT |
329 | */ |
330 | static struct serio *serio_get_pending_child(struct serio *parent) | |
331 | { | |
332 | struct serio_event *event; | |
333 | struct serio *serio, *child = NULL; | |
334 | unsigned long flags; | |
335 | ||
336 | spin_lock_irqsave(&serio_event_lock, flags); | |
337 | ||
338 | list_for_each_entry(event, &serio_event_list, node) { | |
339 | if (event->type == SERIO_REGISTER_PORT) { | |
340 | serio = event->object; | |
341 | if (serio->parent == parent) { | |
342 | child = serio; | |
343 | break; | |
344 | } | |
345 | } | |
346 | } | |
347 | ||
348 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
349 | return child; | |
350 | } | |
351 | ||
1da177e4 LT |
352 | /* |
353 | * Serio port operations | |
354 | */ | |
355 | ||
e404e274 | 356 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
357 | { |
358 | struct serio *serio = to_serio_port(dev); | |
359 | return sprintf(buf, "%s\n", serio->name); | |
360 | } | |
361 | ||
3778a212 | 362 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) |
ae87dff7 DT |
363 | { |
364 | struct serio *serio = to_serio_port(dev); | |
365 | ||
366 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
367 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
368 | } | |
369 | ||
7eab8ded | 370 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
371 | { |
372 | struct serio *serio = to_serio_port(dev); | |
373 | return sprintf(buf, "%02x\n", serio->id.type); | |
374 | } | |
375 | ||
7eab8ded | 376 | static ssize_t proto_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
377 | { |
378 | struct serio *serio = to_serio_port(dev); | |
379 | return sprintf(buf, "%02x\n", serio->id.proto); | |
380 | } | |
381 | ||
7eab8ded | 382 | static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
383 | { |
384 | struct serio *serio = to_serio_port(dev); | |
385 | return sprintf(buf, "%02x\n", serio->id.id); | |
386 | } | |
387 | ||
7eab8ded | 388 | static ssize_t extra_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
389 | { |
390 | struct serio *serio = to_serio_port(dev); | |
391 | return sprintf(buf, "%02x\n", serio->id.extra); | |
392 | } | |
393 | ||
3778a212 | 394 | static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
395 | { |
396 | struct serio *serio = to_serio_port(dev); | |
397 | struct device_driver *drv; | |
70f256fd | 398 | int error; |
1da177e4 | 399 | |
70f256fd DT |
400 | error = mutex_lock_interruptible(&serio_mutex); |
401 | if (error) | |
402 | return error; | |
1da177e4 | 403 | |
1da177e4 LT |
404 | if (!strncmp(buf, "none", count)) { |
405 | serio_disconnect_port(serio); | |
406 | } else if (!strncmp(buf, "reconnect", count)) { | |
09822582 | 407 | serio_reconnect_subtree(serio); |
1da177e4 LT |
408 | } else if (!strncmp(buf, "rescan", count)) { |
409 | serio_disconnect_port(serio); | |
410 | serio_find_driver(serio); | |
19e95541 | 411 | serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); |
1da177e4 LT |
412 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { |
413 | serio_disconnect_port(serio); | |
70f256fd | 414 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
19e95541 | 415 | serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); |
1da177e4 | 416 | } else { |
70f256fd | 417 | error = -EINVAL; |
1da177e4 LT |
418 | } |
419 | ||
c4e32e9f | 420 | mutex_unlock(&serio_mutex); |
1da177e4 | 421 | |
70f256fd | 422 | return error ? error : count; |
1da177e4 LT |
423 | } |
424 | ||
e404e274 | 425 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
426 | { |
427 | struct serio *serio = to_serio_port(dev); | |
428 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
429 | } | |
430 | ||
e404e274 | 431 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
432 | { |
433 | struct serio *serio = to_serio_port(dev); | |
434 | int retval; | |
435 | ||
436 | retval = count; | |
437 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 438 | serio->manual_bind = true; |
1da177e4 | 439 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 440 | serio->manual_bind = false; |
1da177e4 LT |
441 | } else { |
442 | retval = -EINVAL; | |
443 | } | |
444 | ||
445 | return retval; | |
446 | } | |
447 | ||
0456c66f HG |
448 | static ssize_t firmware_id_show(struct device *dev, struct device_attribute *attr, char *buf) |
449 | { | |
450 | struct serio *serio = to_serio_port(dev); | |
451 | ||
452 | return sprintf(buf, "%s\n", serio->firmware_id); | |
453 | } | |
454 | ||
3778a212 GKH |
455 | static DEVICE_ATTR_RO(type); |
456 | static DEVICE_ATTR_RO(proto); | |
457 | static DEVICE_ATTR_RO(id); | |
458 | static DEVICE_ATTR_RO(extra); | |
3778a212 GKH |
459 | |
460 | static struct attribute *serio_device_id_attrs[] = { | |
461 | &dev_attr_type.attr, | |
462 | &dev_attr_proto.attr, | |
463 | &dev_attr_id.attr, | |
464 | &dev_attr_extra.attr, | |
e696c683 DT |
465 | NULL |
466 | }; | |
467 | ||
547a915d | 468 | static const struct attribute_group serio_id_attr_group = { |
e696c683 DT |
469 | .name = "id", |
470 | .attrs = serio_device_id_attrs, | |
471 | }; | |
472 | ||
473 | static DEVICE_ATTR_RO(modalias); | |
474 | static DEVICE_ATTR_WO(drvctl); | |
475 | static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL); | |
476 | static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode); | |
0456c66f | 477 | static DEVICE_ATTR_RO(firmware_id); |
e696c683 DT |
478 | |
479 | static struct attribute *serio_device_attrs[] = { | |
3778a212 GKH |
480 | &dev_attr_modalias.attr, |
481 | &dev_attr_description.attr, | |
482 | &dev_attr_drvctl.attr, | |
483 | &dev_attr_bind_mode.attr, | |
0456c66f | 484 | &dev_attr_firmware_id.attr, |
3778a212 GKH |
485 | NULL |
486 | }; | |
487 | ||
547a915d | 488 | static const struct attribute_group serio_device_attr_group = { |
e696c683 | 489 | .attrs = serio_device_attrs, |
1da177e4 LT |
490 | }; |
491 | ||
3778a212 GKH |
492 | static const struct attribute_group *serio_device_attr_groups[] = { |
493 | &serio_id_attr_group, | |
e696c683 | 494 | &serio_device_attr_group, |
3778a212 GKH |
495 | NULL |
496 | }; | |
1da177e4 LT |
497 | |
498 | static void serio_release_port(struct device *dev) | |
499 | { | |
500 | struct serio *serio = to_serio_port(dev); | |
501 | ||
502 | kfree(serio); | |
503 | module_put(THIS_MODULE); | |
504 | } | |
505 | ||
506 | /* | |
507 | * Prepare serio port for registration. | |
508 | */ | |
509 | static void serio_init_port(struct serio *serio) | |
510 | { | |
939ffb17 | 511 | static atomic_t serio_no = ATOMIC_INIT(-1); |
1da177e4 LT |
512 | |
513 | __module_get(THIS_MODULE); | |
514 | ||
73b59a3b | 515 | INIT_LIST_HEAD(&serio->node); |
09822582 DES |
516 | INIT_LIST_HEAD(&serio->child_node); |
517 | INIT_LIST_HEAD(&serio->children); | |
1da177e4 | 518 | spin_lock_init(&serio->lock); |
c4e32e9f | 519 | mutex_init(&serio->drv_mutex); |
1da177e4 | 520 | device_initialize(&serio->dev); |
0224ec9e | 521 | dev_set_name(&serio->dev, "serio%lu", |
939ffb17 | 522 | (unsigned long)atomic_inc_return(&serio_no)); |
1da177e4 LT |
523 | serio->dev.bus = &serio_bus; |
524 | serio->dev.release = serio_release_port; | |
386d8772 | 525 | serio->dev.groups = serio_device_attr_groups; |
88aa0103 | 526 | if (serio->parent) { |
1da177e4 | 527 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
528 | serio->depth = serio->parent->depth + 1; |
529 | } else | |
530 | serio->depth = 0; | |
531 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
532 | } |
533 | ||
534 | /* | |
535 | * Complete serio port registration. | |
536 | * Driver core will attempt to find appropriate driver for the port. | |
537 | */ | |
538 | static void serio_add_port(struct serio *serio) | |
539 | { | |
09822582 | 540 | struct serio *parent = serio->parent; |
73b59a3b RD |
541 | int error; |
542 | ||
09822582 DES |
543 | if (parent) { |
544 | serio_pause_rx(parent); | |
545 | list_add_tail(&serio->child_node, &parent->children); | |
546 | serio_continue_rx(parent); | |
1da177e4 LT |
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 | /* | |
09822582 | 562 | * serio_destroy_port() completes unregistration process and removes |
1da177e4 LT |
563 | * port from the system |
564 | */ | |
565 | static void serio_destroy_port(struct serio *serio) | |
566 | { | |
567 | struct serio *child; | |
568 | ||
09822582 | 569 | while ((child = serio_get_pending_child(serio)) != NULL) { |
1da177e4 LT |
570 | serio_remove_pending_events(child); |
571 | put_device(&child->dev); | |
572 | } | |
573 | ||
574 | if (serio->stop) | |
575 | serio->stop(serio); | |
576 | ||
577 | if (serio->parent) { | |
578 | serio_pause_rx(serio->parent); | |
09822582 | 579 | list_del_init(&serio->child_node); |
1da177e4 LT |
580 | serio_continue_rx(serio->parent); |
581 | serio->parent = NULL; | |
582 | } | |
583 | ||
ddf1ffbd | 584 | if (device_is_registered(&serio->dev)) |
1da177e4 | 585 | device_del(&serio->dev); |
1da177e4 | 586 | |
73b59a3b | 587 | list_del_init(&serio->node); |
1da177e4 LT |
588 | serio_remove_pending_events(serio); |
589 | put_device(&serio->dev); | |
590 | } | |
591 | ||
6aabcdff SL |
592 | /* |
593 | * Reconnect serio port (re-initialize attached device). | |
594 | * If reconnect fails (old device is no longer attached or | |
595 | * there was no device to begin with) we do full rescan in | |
596 | * hope of finding a driver for the port. | |
597 | */ | |
598 | static int serio_reconnect_port(struct serio *serio) | |
599 | { | |
600 | int error = serio_reconnect_driver(serio); | |
601 | ||
602 | if (error) { | |
603 | serio_disconnect_port(serio); | |
604 | serio_find_driver(serio); | |
605 | } | |
606 | ||
607 | return error; | |
608 | } | |
609 | ||
1da177e4 | 610 | /* |
09822582 DES |
611 | * Reconnect serio port and all its children (re-initialize attached |
612 | * devices). | |
1da177e4 | 613 | */ |
09822582 | 614 | static void serio_reconnect_subtree(struct serio *root) |
1da177e4 | 615 | { |
09822582 DES |
616 | struct serio *s = root; |
617 | int error; | |
618 | ||
1da177e4 | 619 | do { |
09822582 DES |
620 | error = serio_reconnect_port(s); |
621 | if (!error) { | |
622 | /* | |
623 | * Reconnect was successful, move on to do the | |
624 | * first child. | |
625 | */ | |
626 | if (!list_empty(&s->children)) { | |
627 | s = list_first_entry(&s->children, | |
628 | struct serio, child_node); | |
629 | continue; | |
630 | } | |
1da177e4 | 631 | } |
09822582 DES |
632 | |
633 | /* | |
634 | * Either it was a leaf node or reconnect failed and it | |
635 | * became a leaf node. Continue reconnecting starting with | |
636 | * the next sibling of the parent node. | |
637 | */ | |
638 | while (s != root) { | |
639 | struct serio *parent = s->parent; | |
640 | ||
641 | if (!list_is_last(&s->child_node, &parent->children)) { | |
642 | s = list_entry(s->child_node.next, | |
643 | struct serio, child_node); | |
644 | break; | |
645 | } | |
646 | ||
647 | s = parent; | |
648 | } | |
649 | } while (s != root); | |
1da177e4 LT |
650 | } |
651 | ||
652 | /* | |
653 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
09822582 | 654 | * all children ports are unbound and destroyed. |
1da177e4 LT |
655 | */ |
656 | static void serio_disconnect_port(struct serio *serio) | |
657 | { | |
09822582 DES |
658 | struct serio *s = serio; |
659 | ||
660 | /* | |
661 | * Children ports should be disconnected and destroyed | |
662 | * first; we travel the tree in depth-first order. | |
663 | */ | |
664 | while (!list_empty(&serio->children)) { | |
665 | ||
666 | /* Locate a leaf */ | |
667 | while (!list_empty(&s->children)) | |
668 | s = list_first_entry(&s->children, | |
669 | struct serio, child_node); | |
1da177e4 | 670 | |
1da177e4 | 671 | /* |
09822582 DES |
672 | * Prune this leaf node unless it is the one we |
673 | * started with. | |
1da177e4 | 674 | */ |
09822582 DES |
675 | if (s != serio) { |
676 | struct serio *parent = s->parent; | |
1da177e4 | 677 | |
70f256fd | 678 | device_release_driver(&s->dev); |
1da177e4 | 679 | serio_destroy_port(s); |
09822582 DES |
680 | |
681 | s = parent; | |
682 | } | |
1da177e4 LT |
683 | } |
684 | ||
685 | /* | |
09822582 | 686 | * OK, no children left, now disconnect this port. |
1da177e4 | 687 | */ |
70f256fd | 688 | device_release_driver(&serio->dev); |
1da177e4 LT |
689 | } |
690 | ||
691 | void serio_rescan(struct serio *serio) | |
692 | { | |
ed7b1f6d | 693 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
1da177e4 | 694 | } |
89b09b99 | 695 | EXPORT_SYMBOL(serio_rescan); |
1da177e4 LT |
696 | |
697 | void serio_reconnect(struct serio *serio) | |
698 | { | |
09822582 | 699 | serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE); |
1da177e4 | 700 | } |
89b09b99 | 701 | EXPORT_SYMBOL(serio_reconnect); |
1da177e4 LT |
702 | |
703 | /* | |
704 | * Submits register request to kseriod for subsequent execution. | |
705 | * Note that port registration is always asynchronous. | |
706 | */ | |
707 | void __serio_register_port(struct serio *serio, struct module *owner) | |
708 | { | |
709 | serio_init_port(serio); | |
710 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
711 | } | |
89b09b99 | 712 | EXPORT_SYMBOL(__serio_register_port); |
1da177e4 LT |
713 | |
714 | /* | |
715 | * Synchronously unregisters serio port. | |
716 | */ | |
717 | void serio_unregister_port(struct serio *serio) | |
718 | { | |
c4e32e9f | 719 | mutex_lock(&serio_mutex); |
1da177e4 LT |
720 | serio_disconnect_port(serio); |
721 | serio_destroy_port(serio); | |
c4e32e9f | 722 | mutex_unlock(&serio_mutex); |
1da177e4 | 723 | } |
89b09b99 | 724 | EXPORT_SYMBOL(serio_unregister_port); |
1da177e4 | 725 | |
3c803e8e | 726 | /* |
09822582 | 727 | * Safely unregisters children ports if they are present. |
3c803e8e LT |
728 | */ |
729 | void serio_unregister_child_port(struct serio *serio) | |
730 | { | |
09822582 DES |
731 | struct serio *s, *next; |
732 | ||
c4e32e9f | 733 | mutex_lock(&serio_mutex); |
09822582 DES |
734 | list_for_each_entry_safe(s, next, &serio->children, child_node) { |
735 | serio_disconnect_port(s); | |
736 | serio_destroy_port(s); | |
3c803e8e | 737 | } |
c4e32e9f | 738 | mutex_unlock(&serio_mutex); |
3c803e8e | 739 | } |
89b09b99 | 740 | EXPORT_SYMBOL(serio_unregister_child_port); |
3c803e8e | 741 | |
1da177e4 LT |
742 | |
743 | /* | |
744 | * Serio driver operations | |
745 | */ | |
746 | ||
7048f5d0 | 747 | static ssize_t description_show(struct device_driver *drv, char *buf) |
1da177e4 LT |
748 | { |
749 | struct serio_driver *driver = to_serio_driver(drv); | |
750 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
751 | } | |
7048f5d0 | 752 | static DRIVER_ATTR_RO(description); |
1da177e4 | 753 | |
7048f5d0 | 754 | static ssize_t bind_mode_show(struct device_driver *drv, char *buf) |
1da177e4 LT |
755 | { |
756 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
757 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
758 | } | |
759 | ||
7048f5d0 | 760 | static ssize_t bind_mode_store(struct device_driver *drv, const char *buf, size_t count) |
1da177e4 LT |
761 | { |
762 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
763 | int retval; | |
764 | ||
765 | retval = count; | |
766 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 767 | serio_drv->manual_bind = true; |
1da177e4 | 768 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 769 | serio_drv->manual_bind = false; |
1da177e4 LT |
770 | } else { |
771 | retval = -EINVAL; | |
772 | } | |
773 | ||
774 | return retval; | |
775 | } | |
7048f5d0 | 776 | static DRIVER_ATTR_RW(bind_mode); |
1da177e4 | 777 | |
7048f5d0 GKH |
778 | static struct attribute *serio_driver_attrs[] = { |
779 | &driver_attr_description.attr, | |
780 | &driver_attr_bind_mode.attr, | |
781 | NULL, | |
1da177e4 | 782 | }; |
7048f5d0 | 783 | ATTRIBUTE_GROUPS(serio_driver); |
1da177e4 LT |
784 | |
785 | static int serio_driver_probe(struct device *dev) | |
786 | { | |
787 | struct serio *serio = to_serio_port(dev); | |
788 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
789 | ||
3c803e8e | 790 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
791 | } |
792 | ||
793 | static int serio_driver_remove(struct device *dev) | |
794 | { | |
795 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 796 | |
3c803e8e | 797 | serio_disconnect_driver(serio); |
1da177e4 LT |
798 | return 0; |
799 | } | |
800 | ||
82dd9eff DT |
801 | static void serio_cleanup(struct serio *serio) |
802 | { | |
33143ea1 | 803 | mutex_lock(&serio->drv_mutex); |
82dd9eff DT |
804 | if (serio->drv && serio->drv->cleanup) |
805 | serio->drv->cleanup(serio); | |
33143ea1 | 806 | mutex_unlock(&serio->drv_mutex); |
82dd9eff DT |
807 | } |
808 | ||
809 | static void serio_shutdown(struct device *dev) | |
810 | { | |
811 | struct serio *serio = to_serio_port(dev); | |
812 | ||
813 | serio_cleanup(serio); | |
814 | } | |
815 | ||
ed7b1f6d | 816 | static void serio_attach_driver(struct serio_driver *drv) |
73b59a3b RD |
817 | { |
818 | int error; | |
819 | ||
ed7b1f6d | 820 | error = driver_attach(&drv->driver); |
73b59a3b | 821 | if (error) |
fef5f569 JP |
822 | pr_warn("driver_attach() failed for %s with error %d\n", |
823 | drv->driver.name, error); | |
73b59a3b RD |
824 | } |
825 | ||
4b315627 | 826 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
1da177e4 | 827 | { |
7e044e05 | 828 | bool manual_bind = drv->manual_bind; |
ed7b1f6d DT |
829 | int error; |
830 | ||
1da177e4 | 831 | drv->driver.bus = &serio_bus; |
4b315627 GKH |
832 | drv->driver.owner = owner; |
833 | drv->driver.mod_name = mod_name; | |
1da177e4 | 834 | |
ed7b1f6d DT |
835 | /* |
836 | * Temporarily disable automatic binding because probing | |
837 | * takes long time and we are better off doing it in kseriod | |
838 | */ | |
7e044e05 | 839 | drv->manual_bind = true; |
ed7b1f6d DT |
840 | |
841 | error = driver_register(&drv->driver); | |
842 | if (error) { | |
cac9169b | 843 | pr_err("driver_register() failed for %s, error: %d\n", |
ed7b1f6d DT |
844 | drv->driver.name, error); |
845 | return error; | |
846 | } | |
847 | ||
848 | /* | |
849 | * Restore original bind mode and let kseriod bind the | |
850 | * driver to free ports | |
851 | */ | |
852 | if (!manual_bind) { | |
7e044e05 | 853 | drv->manual_bind = false; |
ed7b1f6d DT |
854 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
855 | if (error) { | |
856 | driver_unregister(&drv->driver); | |
857 | return error; | |
858 | } | |
859 | } | |
860 | ||
861 | return 0; | |
1da177e4 | 862 | } |
89b09b99 | 863 | EXPORT_SYMBOL(__serio_register_driver); |
1da177e4 LT |
864 | |
865 | void serio_unregister_driver(struct serio_driver *drv) | |
866 | { | |
867 | struct serio *serio; | |
868 | ||
c4e32e9f | 869 | mutex_lock(&serio_mutex); |
e8ef4347 | 870 | |
7e044e05 | 871 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
e8ef4347 | 872 | serio_remove_pending_events(drv); |
1da177e4 LT |
873 | |
874 | start_over: | |
875 | list_for_each_entry(serio, &serio_list, node) { | |
876 | if (serio->drv == drv) { | |
877 | serio_disconnect_port(serio); | |
878 | serio_find_driver(serio); | |
879 | /* we could've deleted some ports, restart */ | |
880 | goto start_over; | |
881 | } | |
882 | } | |
883 | ||
884 | driver_unregister(&drv->driver); | |
c4e32e9f | 885 | mutex_unlock(&serio_mutex); |
1da177e4 | 886 | } |
89b09b99 | 887 | EXPORT_SYMBOL(serio_unregister_driver); |
1da177e4 LT |
888 | |
889 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
890 | { | |
1da177e4 LT |
891 | serio_pause_rx(serio); |
892 | serio->drv = drv; | |
893 | serio_continue_rx(serio); | |
1da177e4 LT |
894 | } |
895 | ||
896 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
897 | { | |
898 | struct serio *serio = to_serio_port(dev); | |
899 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
900 | ||
901 | if (serio->manual_bind || serio_drv->manual_bind) | |
902 | return 0; | |
903 | ||
904 | return serio_match_port(serio_drv->id_table, serio); | |
905 | } | |
906 | ||
312c004d | 907 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 908 | do { \ |
7eff2e7a | 909 | int err = add_uevent_var(env, fmt, val); \ |
ae87dff7 DT |
910 | if (err) \ |
911 | return err; \ | |
912 | } while (0) | |
913 | ||
7eff2e7a | 914 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
915 | { |
916 | struct serio *serio; | |
1da177e4 LT |
917 | |
918 | if (!dev) | |
919 | return -ENODEV; | |
920 | ||
921 | serio = to_serio_port(dev); | |
922 | ||
312c004d KS |
923 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
924 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
925 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
926 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
0456c66f | 927 | |
312c004d | 928 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", |
ae87dff7 | 929 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 | 930 | |
0456c66f HG |
931 | if (serio->firmware_id[0]) |
932 | SERIO_ADD_UEVENT_VAR("SERIO_FIRMWARE_ID=%s", | |
933 | serio->firmware_id); | |
934 | ||
1da177e4 LT |
935 | return 0; |
936 | } | |
312c004d | 937 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 | 938 | |
82dd9eff | 939 | #ifdef CONFIG_PM |
633aae23 | 940 | static int serio_suspend(struct device *dev) |
82dd9eff | 941 | { |
7e044e05 | 942 | struct serio *serio = to_serio_port(dev); |
82dd9eff | 943 | |
633aae23 | 944 | serio_cleanup(serio); |
82dd9eff DT |
945 | |
946 | return 0; | |
947 | } | |
948 | ||
1da177e4 LT |
949 | static int serio_resume(struct device *dev) |
950 | { | |
7e044e05 | 951 | struct serio *serio = to_serio_port(dev); |
5ea13206 | 952 | int error = -ENOENT; |
7e044e05 | 953 | |
5ea13206 DT |
954 | mutex_lock(&serio->drv_mutex); |
955 | if (serio->drv && serio->drv->fast_reconnect) { | |
956 | error = serio->drv->fast_reconnect(serio); | |
957 | if (error && error != -ENOENT) | |
958 | dev_warn(dev, "fast reconnect failed with error %d\n", | |
959 | error); | |
960 | } | |
961 | mutex_unlock(&serio->drv_mutex); | |
962 | ||
963 | if (error) { | |
964 | /* | |
965 | * Driver reconnect can take a while, so better let | |
966 | * kseriod deal with it. | |
967 | */ | |
968 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); | |
969 | } | |
1da177e4 LT |
970 | |
971 | return 0; | |
972 | } | |
633aae23 DT |
973 | |
974 | static const struct dev_pm_ops serio_pm_ops = { | |
975 | .suspend = serio_suspend, | |
976 | .resume = serio_resume, | |
977 | .poweroff = serio_suspend, | |
978 | .restore = serio_resume, | |
979 | }; | |
82dd9eff | 980 | #endif /* CONFIG_PM */ |
1da177e4 | 981 | |
c4e32e9f | 982 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
983 | int serio_open(struct serio *serio, struct serio_driver *drv) |
984 | { | |
985 | serio_set_drv(serio, drv); | |
986 | ||
987 | if (serio->open && serio->open(serio)) { | |
988 | serio_set_drv(serio, NULL); | |
989 | return -1; | |
990 | } | |
991 | return 0; | |
992 | } | |
89b09b99 | 993 | EXPORT_SYMBOL(serio_open); |
1da177e4 | 994 | |
c4e32e9f | 995 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
996 | void serio_close(struct serio *serio) |
997 | { | |
998 | if (serio->close) | |
999 | serio->close(serio); | |
1000 | ||
1001 | serio_set_drv(serio, NULL); | |
1002 | } | |
89b09b99 | 1003 | EXPORT_SYMBOL(serio_close); |
1da177e4 LT |
1004 | |
1005 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 1006 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
1007 | { |
1008 | unsigned long flags; | |
1009 | irqreturn_t ret = IRQ_NONE; | |
1010 | ||
1011 | spin_lock_irqsave(&serio->lock, flags); | |
1012 | ||
1013 | if (likely(serio->drv)) { | |
7d12e780 | 1014 | ret = serio->drv->interrupt(serio, data, dfl); |
ddf1ffbd | 1015 | } else if (!dfl && device_is_registered(&serio->dev)) { |
1da177e4 LT |
1016 | serio_rescan(serio); |
1017 | ret = IRQ_HANDLED; | |
1018 | } | |
1019 | ||
1020 | spin_unlock_irqrestore(&serio->lock, flags); | |
1021 | ||
1022 | return ret; | |
1023 | } | |
89b09b99 | 1024 | EXPORT_SYMBOL(serio_interrupt); |
1da177e4 | 1025 | |
e1443d28 | 1026 | struct bus_type serio_bus = { |
1ea2a69d | 1027 | .name = "serio", |
7048f5d0 | 1028 | .drv_groups = serio_driver_groups, |
1ea2a69d MN |
1029 | .match = serio_bus_match, |
1030 | .uevent = serio_uevent, | |
1031 | .probe = serio_driver_probe, | |
1032 | .remove = serio_driver_remove, | |
82dd9eff DT |
1033 | .shutdown = serio_shutdown, |
1034 | #ifdef CONFIG_PM | |
633aae23 | 1035 | .pm = &serio_pm_ops, |
82dd9eff | 1036 | #endif |
1ea2a69d | 1037 | }; |
e1443d28 | 1038 | EXPORT_SYMBOL(serio_bus); |
1ea2a69d | 1039 | |
1da177e4 LT |
1040 | static int __init serio_init(void) |
1041 | { | |
73b59a3b | 1042 | int error; |
1da177e4 | 1043 | |
73b59a3b RD |
1044 | error = bus_register(&serio_bus); |
1045 | if (error) { | |
cac9169b | 1046 | pr_err("Failed to register serio bus, error: %d\n", error); |
73b59a3b RD |
1047 | return error; |
1048 | } | |
1049 | ||
1da177e4 LT |
1050 | return 0; |
1051 | } | |
1052 | ||
1053 | static void __exit serio_exit(void) | |
1054 | { | |
1055 | bus_unregister(&serio_bus); | |
8ee294cd DT |
1056 | |
1057 | /* | |
1058 | * There should not be any outstanding events but work may | |
1059 | * still be scheduled so simply cancel it. | |
1060 | */ | |
1061 | cancel_work_sync(&serio_event_work); | |
1da177e4 LT |
1062 | } |
1063 | ||
51c38f9b | 1064 | subsys_initcall(serio_init); |
1da177e4 | 1065 | module_exit(serio_exit); |