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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> | |
1da177e4 | 35 | #include <linux/sched.h> |
1da177e4 | 36 | #include <linux/slab.h> |
8ee294cd | 37 | #include <linux/workqueue.h> |
c4e32e9f | 38 | #include <linux/mutex.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 |
8ee294cd | 46 | * serio port or driver registered or unregistered. |
1da177e4 | 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); |
09822582 | 57 | static void serio_reconnect_subtree(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) { | |
cac9169b DT |
122 | dev_warn(&serio->dev, |
123 | "device_bind_driver() failed for %s (%s) and %s, error: %d\n", | |
124 | serio->phys, serio->name, | |
125 | drv->description, error); | |
0a66045b DT |
126 | serio_disconnect_driver(serio); |
127 | serio->dev.driver = NULL; | |
70f256fd | 128 | return error; |
0a66045b | 129 | } |
1da177e4 | 130 | } |
70f256fd | 131 | return 0; |
1da177e4 LT |
132 | } |
133 | ||
134 | static void serio_find_driver(struct serio *serio) | |
135 | { | |
73b59a3b RD |
136 | int error; |
137 | ||
73b59a3b RD |
138 | error = device_attach(&serio->dev); |
139 | if (error < 0) | |
cac9169b DT |
140 | dev_warn(&serio->dev, |
141 | "device_attach() failed for %s (%s), error: %d\n", | |
142 | serio->phys, serio->name, error); | |
1da177e4 LT |
143 | } |
144 | ||
145 | ||
146 | /* | |
147 | * Serio event processing. | |
148 | */ | |
149 | ||
150 | enum serio_event_type { | |
ed7b1f6d DT |
151 | SERIO_RESCAN_PORT, |
152 | SERIO_RECONNECT_PORT, | |
09822582 | 153 | SERIO_RECONNECT_SUBTREE, |
1da177e4 | 154 | SERIO_REGISTER_PORT, |
ed7b1f6d | 155 | SERIO_ATTACH_DRIVER, |
1da177e4 LT |
156 | }; |
157 | ||
158 | struct serio_event { | |
159 | enum serio_event_type type; | |
160 | void *object; | |
161 | struct module *owner; | |
162 | struct list_head node; | |
163 | }; | |
164 | ||
165 | static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */ | |
166 | static LIST_HEAD(serio_event_list); | |
1da177e4 | 167 | |
8ee294cd | 168 | static struct serio_event *serio_get_event(void) |
1da177e4 | 169 | { |
8ee294cd | 170 | struct serio_event *event = NULL; |
1da177e4 | 171 | unsigned long flags; |
1da177e4 LT |
172 | |
173 | spin_lock_irqsave(&serio_event_lock, flags); | |
174 | ||
8ee294cd DT |
175 | if (!list_empty(&serio_event_list)) { |
176 | event = list_first_entry(&serio_event_list, | |
177 | struct serio_event, node); | |
178 | list_del_init(&event->node); | |
1da177e4 | 179 | } |
ed7b1f6d | 180 | |
1da177e4 | 181 | spin_unlock_irqrestore(&serio_event_lock, flags); |
8ee294cd | 182 | return event; |
1da177e4 LT |
183 | } |
184 | ||
185 | static void serio_free_event(struct serio_event *event) | |
186 | { | |
187 | module_put(event->owner); | |
188 | kfree(event); | |
189 | } | |
190 | ||
19e95541 DL |
191 | static void serio_remove_duplicate_events(void *object, |
192 | enum serio_event_type type) | |
1da177e4 | 193 | { |
4516c818 | 194 | struct serio_event *e, *next; |
1da177e4 LT |
195 | unsigned long flags; |
196 | ||
197 | spin_lock_irqsave(&serio_event_lock, flags); | |
198 | ||
4516c818 | 199 | list_for_each_entry_safe(e, next, &serio_event_list, node) { |
19e95541 | 200 | if (object == e->object) { |
1da177e4 LT |
201 | /* |
202 | * If this event is of different type we should not | |
203 | * look further - we only suppress duplicate events | |
204 | * that were sent back-to-back. | |
205 | */ | |
19e95541 | 206 | if (type != e->type) |
1da177e4 LT |
207 | break; |
208 | ||
4516c818 | 209 | list_del_init(&e->node); |
1da177e4 LT |
210 | serio_free_event(e); |
211 | } | |
212 | } | |
213 | ||
214 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
215 | } | |
216 | ||
8ee294cd | 217 | static void serio_handle_event(struct work_struct *work) |
1da177e4 LT |
218 | { |
219 | struct serio_event *event; | |
1da177e4 | 220 | |
c4e32e9f | 221 | mutex_lock(&serio_mutex); |
1da177e4 | 222 | |
ea486e68 | 223 | while ((event = serio_get_event())) { |
1da177e4 LT |
224 | |
225 | switch (event->type) { | |
1da177e4 | 226 | |
cac9169b DT |
227 | case SERIO_REGISTER_PORT: |
228 | serio_add_port(event->object); | |
229 | break; | |
1da177e4 | 230 | |
cac9169b DT |
231 | case SERIO_RECONNECT_PORT: |
232 | serio_reconnect_port(event->object); | |
233 | break; | |
1da177e4 | 234 | |
cac9169b DT |
235 | case SERIO_RESCAN_PORT: |
236 | serio_disconnect_port(event->object); | |
237 | serio_find_driver(event->object); | |
238 | break; | |
6aabcdff | 239 | |
09822582 DES |
240 | case SERIO_RECONNECT_SUBTREE: |
241 | serio_reconnect_subtree(event->object); | |
cac9169b | 242 | break; |
1da177e4 | 243 | |
cac9169b DT |
244 | case SERIO_ATTACH_DRIVER: |
245 | serio_attach_driver(event->object); | |
246 | break; | |
1da177e4 LT |
247 | } |
248 | ||
19e95541 | 249 | serio_remove_duplicate_events(event->object, event->type); |
1da177e4 LT |
250 | serio_free_event(event); |
251 | } | |
252 | ||
c4e32e9f | 253 | mutex_unlock(&serio_mutex); |
1da177e4 LT |
254 | } |
255 | ||
8ee294cd DT |
256 | static DECLARE_WORK(serio_event_work, serio_handle_event); |
257 | ||
258 | static int serio_queue_event(void *object, struct module *owner, | |
259 | enum serio_event_type event_type) | |
260 | { | |
261 | unsigned long flags; | |
262 | struct serio_event *event; | |
263 | int retval = 0; | |
264 | ||
265 | spin_lock_irqsave(&serio_event_lock, flags); | |
266 | ||
267 | /* | |
268 | * Scan event list for the other events for the same serio port, | |
269 | * starting with the most recent one. If event is the same we | |
270 | * do not need add new one. If event is of different type we | |
271 | * need to add this event and should not look further because | |
272 | * we need to preseve sequence of distinct events. | |
273 | */ | |
274 | list_for_each_entry_reverse(event, &serio_event_list, node) { | |
275 | if (event->object == object) { | |
276 | if (event->type == event_type) | |
277 | goto out; | |
278 | break; | |
279 | } | |
280 | } | |
281 | ||
282 | event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC); | |
283 | if (!event) { | |
284 | pr_err("Not enough memory to queue event %d\n", event_type); | |
285 | retval = -ENOMEM; | |
286 | goto out; | |
287 | } | |
288 | ||
289 | if (!try_module_get(owner)) { | |
290 | pr_warning("Can't get module reference, dropping event %d\n", | |
291 | event_type); | |
292 | kfree(event); | |
293 | retval = -EINVAL; | |
294 | goto out; | |
295 | } | |
296 | ||
297 | event->type = event_type; | |
298 | event->object = object; | |
299 | event->owner = owner; | |
300 | ||
301 | list_add_tail(&event->node, &serio_event_list); | |
1d64b655 | 302 | queue_work(system_long_wq, &serio_event_work); |
8ee294cd DT |
303 | |
304 | out: | |
305 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
306 | return retval; | |
307 | } | |
308 | ||
1da177e4 | 309 | /* |
e8ef4347 DT |
310 | * Remove all events that have been submitted for a given |
311 | * object, be it serio port or driver. | |
1da177e4 | 312 | */ |
e8ef4347 | 313 | static void serio_remove_pending_events(void *object) |
1da177e4 | 314 | { |
4516c818 | 315 | struct serio_event *event, *next; |
1da177e4 LT |
316 | unsigned long flags; |
317 | ||
318 | spin_lock_irqsave(&serio_event_lock, flags); | |
319 | ||
4516c818 | 320 | list_for_each_entry_safe(event, next, &serio_event_list, node) { |
e8ef4347 | 321 | if (event->object == object) { |
4516c818 | 322 | list_del_init(&event->node); |
1da177e4 LT |
323 | serio_free_event(event); |
324 | } | |
325 | } | |
326 | ||
327 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
328 | } | |
329 | ||
330 | /* | |
09822582 | 331 | * Locate child serio port (if any) that has not been fully registered yet. |
1da177e4 | 332 | * |
09822582 DES |
333 | * Children are registered by driver's connect() handler so there can't be a |
334 | * grandchild pending registration together with a child. | |
1da177e4 LT |
335 | */ |
336 | static struct serio *serio_get_pending_child(struct serio *parent) | |
337 | { | |
338 | struct serio_event *event; | |
339 | struct serio *serio, *child = NULL; | |
340 | unsigned long flags; | |
341 | ||
342 | spin_lock_irqsave(&serio_event_lock, flags); | |
343 | ||
344 | list_for_each_entry(event, &serio_event_list, node) { | |
345 | if (event->type == SERIO_REGISTER_PORT) { | |
346 | serio = event->object; | |
347 | if (serio->parent == parent) { | |
348 | child = serio; | |
349 | break; | |
350 | } | |
351 | } | |
352 | } | |
353 | ||
354 | spin_unlock_irqrestore(&serio_event_lock, flags); | |
355 | return child; | |
356 | } | |
357 | ||
1da177e4 LT |
358 | /* |
359 | * Serio port operations | |
360 | */ | |
361 | ||
e404e274 | 362 | static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
363 | { |
364 | struct serio *serio = to_serio_port(dev); | |
365 | return sprintf(buf, "%s\n", serio->name); | |
366 | } | |
367 | ||
3778a212 | 368 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) |
ae87dff7 DT |
369 | { |
370 | struct serio *serio = to_serio_port(dev); | |
371 | ||
372 | return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n", | |
373 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); | |
374 | } | |
375 | ||
7eab8ded | 376 | static ssize_t type_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.type); | |
380 | } | |
381 | ||
7eab8ded | 382 | static ssize_t proto_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.proto); | |
386 | } | |
387 | ||
7eab8ded | 388 | static ssize_t id_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.id); | |
392 | } | |
393 | ||
7eab8ded | 394 | static ssize_t extra_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
395 | { |
396 | struct serio *serio = to_serio_port(dev); | |
397 | return sprintf(buf, "%02x\n", serio->id.extra); | |
398 | } | |
399 | ||
3778a212 | 400 | static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
401 | { |
402 | struct serio *serio = to_serio_port(dev); | |
403 | struct device_driver *drv; | |
70f256fd | 404 | int error; |
1da177e4 | 405 | |
70f256fd DT |
406 | error = mutex_lock_interruptible(&serio_mutex); |
407 | if (error) | |
408 | return error; | |
1da177e4 | 409 | |
1da177e4 LT |
410 | if (!strncmp(buf, "none", count)) { |
411 | serio_disconnect_port(serio); | |
412 | } else if (!strncmp(buf, "reconnect", count)) { | |
09822582 | 413 | serio_reconnect_subtree(serio); |
1da177e4 LT |
414 | } else if (!strncmp(buf, "rescan", count)) { |
415 | serio_disconnect_port(serio); | |
416 | serio_find_driver(serio); | |
19e95541 | 417 | serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); |
1da177e4 LT |
418 | } else if ((drv = driver_find(buf, &serio_bus)) != NULL) { |
419 | serio_disconnect_port(serio); | |
70f256fd | 420 | error = serio_bind_driver(serio, to_serio_driver(drv)); |
19e95541 | 421 | serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT); |
1da177e4 | 422 | } else { |
70f256fd | 423 | error = -EINVAL; |
1da177e4 LT |
424 | } |
425 | ||
c4e32e9f | 426 | mutex_unlock(&serio_mutex); |
1da177e4 | 427 | |
70f256fd | 428 | return error ? error : count; |
1da177e4 LT |
429 | } |
430 | ||
e404e274 | 431 | static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
432 | { |
433 | struct serio *serio = to_serio_port(dev); | |
434 | return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto"); | |
435 | } | |
436 | ||
e404e274 | 437 | static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
438 | { |
439 | struct serio *serio = to_serio_port(dev); | |
440 | int retval; | |
441 | ||
442 | retval = count; | |
443 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 444 | serio->manual_bind = true; |
1da177e4 | 445 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 446 | serio->manual_bind = false; |
1da177e4 LT |
447 | } else { |
448 | retval = -EINVAL; | |
449 | } | |
450 | ||
451 | return retval; | |
452 | } | |
453 | ||
0456c66f HG |
454 | static ssize_t firmware_id_show(struct device *dev, struct device_attribute *attr, char *buf) |
455 | { | |
456 | struct serio *serio = to_serio_port(dev); | |
457 | ||
458 | return sprintf(buf, "%s\n", serio->firmware_id); | |
459 | } | |
460 | ||
3778a212 GKH |
461 | static DEVICE_ATTR_RO(type); |
462 | static DEVICE_ATTR_RO(proto); | |
463 | static DEVICE_ATTR_RO(id); | |
464 | static DEVICE_ATTR_RO(extra); | |
3778a212 GKH |
465 | |
466 | static struct attribute *serio_device_id_attrs[] = { | |
467 | &dev_attr_type.attr, | |
468 | &dev_attr_proto.attr, | |
469 | &dev_attr_id.attr, | |
470 | &dev_attr_extra.attr, | |
e696c683 DT |
471 | NULL |
472 | }; | |
473 | ||
474 | static struct attribute_group serio_id_attr_group = { | |
475 | .name = "id", | |
476 | .attrs = serio_device_id_attrs, | |
477 | }; | |
478 | ||
479 | static DEVICE_ATTR_RO(modalias); | |
480 | static DEVICE_ATTR_WO(drvctl); | |
481 | static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL); | |
482 | static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode); | |
0456c66f | 483 | static DEVICE_ATTR_RO(firmware_id); |
e696c683 DT |
484 | |
485 | static struct attribute *serio_device_attrs[] = { | |
3778a212 GKH |
486 | &dev_attr_modalias.attr, |
487 | &dev_attr_description.attr, | |
488 | &dev_attr_drvctl.attr, | |
489 | &dev_attr_bind_mode.attr, | |
0456c66f | 490 | &dev_attr_firmware_id.attr, |
3778a212 GKH |
491 | NULL |
492 | }; | |
493 | ||
e696c683 DT |
494 | static struct attribute_group serio_device_attr_group = { |
495 | .attrs = serio_device_attrs, | |
1da177e4 LT |
496 | }; |
497 | ||
3778a212 GKH |
498 | static const struct attribute_group *serio_device_attr_groups[] = { |
499 | &serio_id_attr_group, | |
e696c683 | 500 | &serio_device_attr_group, |
3778a212 GKH |
501 | NULL |
502 | }; | |
1da177e4 LT |
503 | |
504 | static void serio_release_port(struct device *dev) | |
505 | { | |
506 | struct serio *serio = to_serio_port(dev); | |
507 | ||
508 | kfree(serio); | |
509 | module_put(THIS_MODULE); | |
510 | } | |
511 | ||
512 | /* | |
513 | * Prepare serio port for registration. | |
514 | */ | |
515 | static void serio_init_port(struct serio *serio) | |
516 | { | |
939ffb17 | 517 | static atomic_t serio_no = ATOMIC_INIT(-1); |
1da177e4 LT |
518 | |
519 | __module_get(THIS_MODULE); | |
520 | ||
73b59a3b | 521 | INIT_LIST_HEAD(&serio->node); |
09822582 DES |
522 | INIT_LIST_HEAD(&serio->child_node); |
523 | INIT_LIST_HEAD(&serio->children); | |
1da177e4 | 524 | spin_lock_init(&serio->lock); |
c4e32e9f | 525 | mutex_init(&serio->drv_mutex); |
1da177e4 | 526 | device_initialize(&serio->dev); |
0224ec9e | 527 | dev_set_name(&serio->dev, "serio%lu", |
939ffb17 | 528 | (unsigned long)atomic_inc_return(&serio_no)); |
1da177e4 LT |
529 | serio->dev.bus = &serio_bus; |
530 | serio->dev.release = serio_release_port; | |
386d8772 | 531 | serio->dev.groups = serio_device_attr_groups; |
88aa0103 | 532 | if (serio->parent) { |
1da177e4 | 533 | serio->dev.parent = &serio->parent->dev; |
88aa0103 JK |
534 | serio->depth = serio->parent->depth + 1; |
535 | } else | |
536 | serio->depth = 0; | |
537 | lockdep_set_subclass(&serio->lock, serio->depth); | |
1da177e4 LT |
538 | } |
539 | ||
540 | /* | |
541 | * Complete serio port registration. | |
542 | * Driver core will attempt to find appropriate driver for the port. | |
543 | */ | |
544 | static void serio_add_port(struct serio *serio) | |
545 | { | |
09822582 | 546 | struct serio *parent = serio->parent; |
73b59a3b RD |
547 | int error; |
548 | ||
09822582 DES |
549 | if (parent) { |
550 | serio_pause_rx(parent); | |
551 | list_add_tail(&serio->child_node, &parent->children); | |
552 | serio_continue_rx(parent); | |
1da177e4 LT |
553 | } |
554 | ||
555 | list_add_tail(&serio->node, &serio_list); | |
386d8772 | 556 | |
1da177e4 LT |
557 | if (serio->start) |
558 | serio->start(serio); | |
386d8772 | 559 | |
73b59a3b RD |
560 | error = device_add(&serio->dev); |
561 | if (error) | |
cac9169b DT |
562 | dev_err(&serio->dev, |
563 | "device_add() failed for %s (%s), error: %d\n", | |
73b59a3b | 564 | serio->phys, serio->name, error); |
1da177e4 LT |
565 | } |
566 | ||
567 | /* | |
09822582 | 568 | * serio_destroy_port() completes unregistration process and removes |
1da177e4 LT |
569 | * port from the system |
570 | */ | |
571 | static void serio_destroy_port(struct serio *serio) | |
572 | { | |
573 | struct serio *child; | |
574 | ||
09822582 | 575 | while ((child = serio_get_pending_child(serio)) != NULL) { |
1da177e4 LT |
576 | serio_remove_pending_events(child); |
577 | put_device(&child->dev); | |
578 | } | |
579 | ||
580 | if (serio->stop) | |
581 | serio->stop(serio); | |
582 | ||
583 | if (serio->parent) { | |
584 | serio_pause_rx(serio->parent); | |
09822582 | 585 | list_del_init(&serio->child_node); |
1da177e4 LT |
586 | serio_continue_rx(serio->parent); |
587 | serio->parent = NULL; | |
588 | } | |
589 | ||
ddf1ffbd | 590 | if (device_is_registered(&serio->dev)) |
1da177e4 | 591 | device_del(&serio->dev); |
1da177e4 | 592 | |
73b59a3b | 593 | list_del_init(&serio->node); |
1da177e4 LT |
594 | serio_remove_pending_events(serio); |
595 | put_device(&serio->dev); | |
596 | } | |
597 | ||
6aabcdff SL |
598 | /* |
599 | * Reconnect serio port (re-initialize attached device). | |
600 | * If reconnect fails (old device is no longer attached or | |
601 | * there was no device to begin with) we do full rescan in | |
602 | * hope of finding a driver for the port. | |
603 | */ | |
604 | static int serio_reconnect_port(struct serio *serio) | |
605 | { | |
606 | int error = serio_reconnect_driver(serio); | |
607 | ||
608 | if (error) { | |
609 | serio_disconnect_port(serio); | |
610 | serio_find_driver(serio); | |
611 | } | |
612 | ||
613 | return error; | |
614 | } | |
615 | ||
1da177e4 | 616 | /* |
09822582 DES |
617 | * Reconnect serio port and all its children (re-initialize attached |
618 | * devices). | |
1da177e4 | 619 | */ |
09822582 | 620 | static void serio_reconnect_subtree(struct serio *root) |
1da177e4 | 621 | { |
09822582 DES |
622 | struct serio *s = root; |
623 | int error; | |
624 | ||
1da177e4 | 625 | do { |
09822582 DES |
626 | error = serio_reconnect_port(s); |
627 | if (!error) { | |
628 | /* | |
629 | * Reconnect was successful, move on to do the | |
630 | * first child. | |
631 | */ | |
632 | if (!list_empty(&s->children)) { | |
633 | s = list_first_entry(&s->children, | |
634 | struct serio, child_node); | |
635 | continue; | |
636 | } | |
1da177e4 | 637 | } |
09822582 DES |
638 | |
639 | /* | |
640 | * Either it was a leaf node or reconnect failed and it | |
641 | * became a leaf node. Continue reconnecting starting with | |
642 | * the next sibling of the parent node. | |
643 | */ | |
644 | while (s != root) { | |
645 | struct serio *parent = s->parent; | |
646 | ||
647 | if (!list_is_last(&s->child_node, &parent->children)) { | |
648 | s = list_entry(s->child_node.next, | |
649 | struct serio, child_node); | |
650 | break; | |
651 | } | |
652 | ||
653 | s = parent; | |
654 | } | |
655 | } while (s != root); | |
1da177e4 LT |
656 | } |
657 | ||
658 | /* | |
659 | * serio_disconnect_port() unbinds a port from its driver. As a side effect | |
09822582 | 660 | * all children ports are unbound and destroyed. |
1da177e4 LT |
661 | */ |
662 | static void serio_disconnect_port(struct serio *serio) | |
663 | { | |
09822582 DES |
664 | struct serio *s = serio; |
665 | ||
666 | /* | |
667 | * Children ports should be disconnected and destroyed | |
668 | * first; we travel the tree in depth-first order. | |
669 | */ | |
670 | while (!list_empty(&serio->children)) { | |
671 | ||
672 | /* Locate a leaf */ | |
673 | while (!list_empty(&s->children)) | |
674 | s = list_first_entry(&s->children, | |
675 | struct serio, child_node); | |
1da177e4 | 676 | |
1da177e4 | 677 | /* |
09822582 DES |
678 | * Prune this leaf node unless it is the one we |
679 | * started with. | |
1da177e4 | 680 | */ |
09822582 DES |
681 | if (s != serio) { |
682 | struct serio *parent = s->parent; | |
1da177e4 | 683 | |
70f256fd | 684 | device_release_driver(&s->dev); |
1da177e4 | 685 | serio_destroy_port(s); |
09822582 DES |
686 | |
687 | s = parent; | |
688 | } | |
1da177e4 LT |
689 | } |
690 | ||
691 | /* | |
09822582 | 692 | * OK, no children left, now disconnect this port. |
1da177e4 | 693 | */ |
70f256fd | 694 | device_release_driver(&serio->dev); |
1da177e4 LT |
695 | } |
696 | ||
697 | void serio_rescan(struct serio *serio) | |
698 | { | |
ed7b1f6d | 699 | serio_queue_event(serio, NULL, SERIO_RESCAN_PORT); |
1da177e4 | 700 | } |
89b09b99 | 701 | EXPORT_SYMBOL(serio_rescan); |
1da177e4 LT |
702 | |
703 | void serio_reconnect(struct serio *serio) | |
704 | { | |
09822582 | 705 | serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE); |
1da177e4 | 706 | } |
89b09b99 | 707 | EXPORT_SYMBOL(serio_reconnect); |
1da177e4 LT |
708 | |
709 | /* | |
710 | * Submits register request to kseriod for subsequent execution. | |
711 | * Note that port registration is always asynchronous. | |
712 | */ | |
713 | void __serio_register_port(struct serio *serio, struct module *owner) | |
714 | { | |
715 | serio_init_port(serio); | |
716 | serio_queue_event(serio, owner, SERIO_REGISTER_PORT); | |
717 | } | |
89b09b99 | 718 | EXPORT_SYMBOL(__serio_register_port); |
1da177e4 LT |
719 | |
720 | /* | |
721 | * Synchronously unregisters serio port. | |
722 | */ | |
723 | void serio_unregister_port(struct serio *serio) | |
724 | { | |
c4e32e9f | 725 | mutex_lock(&serio_mutex); |
1da177e4 LT |
726 | serio_disconnect_port(serio); |
727 | serio_destroy_port(serio); | |
c4e32e9f | 728 | mutex_unlock(&serio_mutex); |
1da177e4 | 729 | } |
89b09b99 | 730 | EXPORT_SYMBOL(serio_unregister_port); |
1da177e4 | 731 | |
3c803e8e | 732 | /* |
09822582 | 733 | * Safely unregisters children ports if they are present. |
3c803e8e LT |
734 | */ |
735 | void serio_unregister_child_port(struct serio *serio) | |
736 | { | |
09822582 DES |
737 | struct serio *s, *next; |
738 | ||
c4e32e9f | 739 | mutex_lock(&serio_mutex); |
09822582 DES |
740 | list_for_each_entry_safe(s, next, &serio->children, child_node) { |
741 | serio_disconnect_port(s); | |
742 | serio_destroy_port(s); | |
3c803e8e | 743 | } |
c4e32e9f | 744 | mutex_unlock(&serio_mutex); |
3c803e8e | 745 | } |
89b09b99 | 746 | EXPORT_SYMBOL(serio_unregister_child_port); |
3c803e8e | 747 | |
1da177e4 LT |
748 | |
749 | /* | |
750 | * Serio driver operations | |
751 | */ | |
752 | ||
7048f5d0 | 753 | static ssize_t description_show(struct device_driver *drv, char *buf) |
1da177e4 LT |
754 | { |
755 | struct serio_driver *driver = to_serio_driver(drv); | |
756 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
757 | } | |
7048f5d0 | 758 | static DRIVER_ATTR_RO(description); |
1da177e4 | 759 | |
7048f5d0 | 760 | static ssize_t bind_mode_show(struct device_driver *drv, char *buf) |
1da177e4 LT |
761 | { |
762 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
763 | return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto"); | |
764 | } | |
765 | ||
7048f5d0 | 766 | static ssize_t bind_mode_store(struct device_driver *drv, const char *buf, size_t count) |
1da177e4 LT |
767 | { |
768 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
769 | int retval; | |
770 | ||
771 | retval = count; | |
772 | if (!strncmp(buf, "manual", count)) { | |
7e044e05 | 773 | serio_drv->manual_bind = true; |
1da177e4 | 774 | } else if (!strncmp(buf, "auto", count)) { |
7e044e05 | 775 | serio_drv->manual_bind = false; |
1da177e4 LT |
776 | } else { |
777 | retval = -EINVAL; | |
778 | } | |
779 | ||
780 | return retval; | |
781 | } | |
7048f5d0 | 782 | static DRIVER_ATTR_RW(bind_mode); |
1da177e4 | 783 | |
7048f5d0 GKH |
784 | static struct attribute *serio_driver_attrs[] = { |
785 | &driver_attr_description.attr, | |
786 | &driver_attr_bind_mode.attr, | |
787 | NULL, | |
1da177e4 | 788 | }; |
7048f5d0 | 789 | ATTRIBUTE_GROUPS(serio_driver); |
1da177e4 LT |
790 | |
791 | static int serio_driver_probe(struct device *dev) | |
792 | { | |
793 | struct serio *serio = to_serio_port(dev); | |
794 | struct serio_driver *drv = to_serio_driver(dev->driver); | |
795 | ||
3c803e8e | 796 | return serio_connect_driver(serio, drv); |
1da177e4 LT |
797 | } |
798 | ||
799 | static int serio_driver_remove(struct device *dev) | |
800 | { | |
801 | struct serio *serio = to_serio_port(dev); | |
1da177e4 | 802 | |
3c803e8e | 803 | serio_disconnect_driver(serio); |
1da177e4 LT |
804 | return 0; |
805 | } | |
806 | ||
82dd9eff DT |
807 | static void serio_cleanup(struct serio *serio) |
808 | { | |
33143ea1 | 809 | mutex_lock(&serio->drv_mutex); |
82dd9eff DT |
810 | if (serio->drv && serio->drv->cleanup) |
811 | serio->drv->cleanup(serio); | |
33143ea1 | 812 | mutex_unlock(&serio->drv_mutex); |
82dd9eff DT |
813 | } |
814 | ||
815 | static void serio_shutdown(struct device *dev) | |
816 | { | |
817 | struct serio *serio = to_serio_port(dev); | |
818 | ||
819 | serio_cleanup(serio); | |
820 | } | |
821 | ||
ed7b1f6d | 822 | static void serio_attach_driver(struct serio_driver *drv) |
73b59a3b RD |
823 | { |
824 | int error; | |
825 | ||
ed7b1f6d | 826 | error = driver_attach(&drv->driver); |
73b59a3b | 827 | if (error) |
cac9169b DT |
828 | pr_warning("driver_attach() failed for %s with error %d\n", |
829 | drv->driver.name, error); | |
73b59a3b RD |
830 | } |
831 | ||
4b315627 | 832 | int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name) |
1da177e4 | 833 | { |
7e044e05 | 834 | bool manual_bind = drv->manual_bind; |
ed7b1f6d DT |
835 | int error; |
836 | ||
1da177e4 | 837 | drv->driver.bus = &serio_bus; |
4b315627 GKH |
838 | drv->driver.owner = owner; |
839 | drv->driver.mod_name = mod_name; | |
1da177e4 | 840 | |
ed7b1f6d DT |
841 | /* |
842 | * Temporarily disable automatic binding because probing | |
843 | * takes long time and we are better off doing it in kseriod | |
844 | */ | |
7e044e05 | 845 | drv->manual_bind = true; |
ed7b1f6d DT |
846 | |
847 | error = driver_register(&drv->driver); | |
848 | if (error) { | |
cac9169b | 849 | pr_err("driver_register() failed for %s, error: %d\n", |
ed7b1f6d DT |
850 | drv->driver.name, error); |
851 | return error; | |
852 | } | |
853 | ||
854 | /* | |
855 | * Restore original bind mode and let kseriod bind the | |
856 | * driver to free ports | |
857 | */ | |
858 | if (!manual_bind) { | |
7e044e05 | 859 | drv->manual_bind = false; |
ed7b1f6d DT |
860 | error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER); |
861 | if (error) { | |
862 | driver_unregister(&drv->driver); | |
863 | return error; | |
864 | } | |
865 | } | |
866 | ||
867 | return 0; | |
1da177e4 | 868 | } |
89b09b99 | 869 | EXPORT_SYMBOL(__serio_register_driver); |
1da177e4 LT |
870 | |
871 | void serio_unregister_driver(struct serio_driver *drv) | |
872 | { | |
873 | struct serio *serio; | |
874 | ||
c4e32e9f | 875 | mutex_lock(&serio_mutex); |
e8ef4347 | 876 | |
7e044e05 | 877 | drv->manual_bind = true; /* so serio_find_driver ignores it */ |
e8ef4347 | 878 | serio_remove_pending_events(drv); |
1da177e4 LT |
879 | |
880 | start_over: | |
881 | list_for_each_entry(serio, &serio_list, node) { | |
882 | if (serio->drv == drv) { | |
883 | serio_disconnect_port(serio); | |
884 | serio_find_driver(serio); | |
885 | /* we could've deleted some ports, restart */ | |
886 | goto start_over; | |
887 | } | |
888 | } | |
889 | ||
890 | driver_unregister(&drv->driver); | |
c4e32e9f | 891 | mutex_unlock(&serio_mutex); |
1da177e4 | 892 | } |
89b09b99 | 893 | EXPORT_SYMBOL(serio_unregister_driver); |
1da177e4 LT |
894 | |
895 | static void serio_set_drv(struct serio *serio, struct serio_driver *drv) | |
896 | { | |
1da177e4 LT |
897 | serio_pause_rx(serio); |
898 | serio->drv = drv; | |
899 | serio_continue_rx(serio); | |
1da177e4 LT |
900 | } |
901 | ||
902 | static int serio_bus_match(struct device *dev, struct device_driver *drv) | |
903 | { | |
904 | struct serio *serio = to_serio_port(dev); | |
905 | struct serio_driver *serio_drv = to_serio_driver(drv); | |
906 | ||
907 | if (serio->manual_bind || serio_drv->manual_bind) | |
908 | return 0; | |
909 | ||
910 | return serio_match_port(serio_drv->id_table, serio); | |
911 | } | |
912 | ||
312c004d | 913 | #define SERIO_ADD_UEVENT_VAR(fmt, val...) \ |
ae87dff7 | 914 | do { \ |
7eff2e7a | 915 | int err = add_uevent_var(env, fmt, val); \ |
ae87dff7 DT |
916 | if (err) \ |
917 | return err; \ | |
918 | } while (0) | |
919 | ||
7eff2e7a | 920 | static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
921 | { |
922 | struct serio *serio; | |
1da177e4 LT |
923 | |
924 | if (!dev) | |
925 | return -ENODEV; | |
926 | ||
927 | serio = to_serio_port(dev); | |
928 | ||
312c004d KS |
929 | SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type); |
930 | SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto); | |
931 | SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id); | |
932 | SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); | |
0456c66f | 933 | |
312c004d | 934 | SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", |
ae87dff7 | 935 | serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); |
1da177e4 | 936 | |
0456c66f HG |
937 | if (serio->firmware_id[0]) |
938 | SERIO_ADD_UEVENT_VAR("SERIO_FIRMWARE_ID=%s", | |
939 | serio->firmware_id); | |
940 | ||
1da177e4 LT |
941 | return 0; |
942 | } | |
312c004d | 943 | #undef SERIO_ADD_UEVENT_VAR |
1da177e4 | 944 | |
82dd9eff | 945 | #ifdef CONFIG_PM |
633aae23 | 946 | static int serio_suspend(struct device *dev) |
82dd9eff | 947 | { |
7e044e05 | 948 | struct serio *serio = to_serio_port(dev); |
82dd9eff | 949 | |
633aae23 | 950 | serio_cleanup(serio); |
82dd9eff DT |
951 | |
952 | return 0; | |
953 | } | |
954 | ||
1da177e4 LT |
955 | static int serio_resume(struct device *dev) |
956 | { | |
7e044e05 DT |
957 | struct serio *serio = to_serio_port(dev); |
958 | ||
6aabcdff SL |
959 | /* |
960 | * Driver reconnect can take a while, so better let kseriod | |
961 | * deal with it. | |
962 | */ | |
633aae23 | 963 | serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT); |
1da177e4 LT |
964 | |
965 | return 0; | |
966 | } | |
633aae23 DT |
967 | |
968 | static const struct dev_pm_ops serio_pm_ops = { | |
969 | .suspend = serio_suspend, | |
970 | .resume = serio_resume, | |
971 | .poweroff = serio_suspend, | |
972 | .restore = serio_resume, | |
973 | }; | |
82dd9eff | 974 | #endif /* CONFIG_PM */ |
1da177e4 | 975 | |
c4e32e9f | 976 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
977 | int serio_open(struct serio *serio, struct serio_driver *drv) |
978 | { | |
979 | serio_set_drv(serio, drv); | |
980 | ||
981 | if (serio->open && serio->open(serio)) { | |
982 | serio_set_drv(serio, NULL); | |
983 | return -1; | |
984 | } | |
985 | return 0; | |
986 | } | |
89b09b99 | 987 | EXPORT_SYMBOL(serio_open); |
1da177e4 | 988 | |
c4e32e9f | 989 | /* called from serio_driver->connect/disconnect methods under serio_mutex */ |
1da177e4 LT |
990 | void serio_close(struct serio *serio) |
991 | { | |
992 | if (serio->close) | |
993 | serio->close(serio); | |
994 | ||
995 | serio_set_drv(serio, NULL); | |
996 | } | |
89b09b99 | 997 | EXPORT_SYMBOL(serio_close); |
1da177e4 LT |
998 | |
999 | irqreturn_t serio_interrupt(struct serio *serio, | |
7d12e780 | 1000 | unsigned char data, unsigned int dfl) |
1da177e4 LT |
1001 | { |
1002 | unsigned long flags; | |
1003 | irqreturn_t ret = IRQ_NONE; | |
1004 | ||
1005 | spin_lock_irqsave(&serio->lock, flags); | |
1006 | ||
1007 | if (likely(serio->drv)) { | |
7d12e780 | 1008 | ret = serio->drv->interrupt(serio, data, dfl); |
ddf1ffbd | 1009 | } else if (!dfl && device_is_registered(&serio->dev)) { |
1da177e4 LT |
1010 | serio_rescan(serio); |
1011 | ret = IRQ_HANDLED; | |
1012 | } | |
1013 | ||
1014 | spin_unlock_irqrestore(&serio->lock, flags); | |
1015 | ||
1016 | return ret; | |
1017 | } | |
89b09b99 | 1018 | EXPORT_SYMBOL(serio_interrupt); |
1da177e4 | 1019 | |
1ea2a69d MN |
1020 | static struct bus_type serio_bus = { |
1021 | .name = "serio", | |
7048f5d0 | 1022 | .drv_groups = serio_driver_groups, |
1ea2a69d MN |
1023 | .match = serio_bus_match, |
1024 | .uevent = serio_uevent, | |
1025 | .probe = serio_driver_probe, | |
1026 | .remove = serio_driver_remove, | |
82dd9eff DT |
1027 | .shutdown = serio_shutdown, |
1028 | #ifdef CONFIG_PM | |
633aae23 | 1029 | .pm = &serio_pm_ops, |
82dd9eff | 1030 | #endif |
1ea2a69d MN |
1031 | }; |
1032 | ||
1da177e4 LT |
1033 | static int __init serio_init(void) |
1034 | { | |
73b59a3b | 1035 | int error; |
1da177e4 | 1036 | |
73b59a3b RD |
1037 | error = bus_register(&serio_bus); |
1038 | if (error) { | |
cac9169b | 1039 | pr_err("Failed to register serio bus, error: %d\n", error); |
73b59a3b RD |
1040 | return error; |
1041 | } | |
1042 | ||
1da177e4 LT |
1043 | return 0; |
1044 | } | |
1045 | ||
1046 | static void __exit serio_exit(void) | |
1047 | { | |
1048 | bus_unregister(&serio_bus); | |
8ee294cd DT |
1049 | |
1050 | /* | |
1051 | * There should not be any outstanding events but work may | |
1052 | * still be scheduled so simply cancel it. | |
1053 | */ | |
1054 | cancel_work_sync(&serio_event_work); | |
1da177e4 LT |
1055 | } |
1056 | ||
51c38f9b | 1057 | subsys_initcall(serio_init); |
1da177e4 | 1058 | module_exit(serio_exit); |