Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * ALSA sequencer device management | |
3 | * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * | |
20 | *---------------------------------------------------------------- | |
21 | * | |
22 | * This device handler separates the card driver module from sequencer | |
23 | * stuff (sequencer core, synth drivers, etc), so that user can avoid | |
24 | * to spend unnecessary resources e.g. if he needs only listening to | |
25 | * MP3s. | |
26 | * | |
27 | * The card (or lowlevel) driver creates a sequencer device entry | |
28 | * via snd_seq_device_new(). This is an entry pointer to communicate | |
29 | * with the sequencer device "driver", which is involved with the | |
30 | * actual part to communicate with the sequencer core. | |
31 | * Each sequencer device entry has an id string and the corresponding | |
32 | * driver with the same id is loaded when required. For example, | |
33 | * lowlevel codes to access emu8000 chip on sbawe card are included in | |
34 | * emu8000-synth module. To activate this module, the hardware | |
35 | * resources like i/o port are passed via snd_seq_device argument. | |
36 | * | |
37 | */ | |
38 | ||
39 | #include <sound/driver.h> | |
40 | #include <linux/init.h> | |
41 | #include <sound/core.h> | |
42 | #include <sound/info.h> | |
43 | #include <sound/seq_device.h> | |
44 | #include <sound/seq_kernel.h> | |
45 | #include <sound/initval.h> | |
46 | #include <linux/kmod.h> | |
47 | #include <linux/slab.h> | |
1a60d4c5 | 48 | #include <linux/mutex.h> |
1da177e4 LT |
49 | |
50 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); | |
51 | MODULE_DESCRIPTION("ALSA sequencer device management"); | |
52 | MODULE_LICENSE("GPL"); | |
53 | ||
1da177e4 LT |
54 | /* driver state */ |
55 | #define DRIVER_EMPTY 0 | |
56 | #define DRIVER_LOADED (1<<0) | |
57 | #define DRIVER_REQUESTED (1<<1) | |
58 | #define DRIVER_LOCKED (1<<2) | |
59 | ||
60 | struct ops_list { | |
61 | char id[ID_LEN]; /* driver id */ | |
62 | int driver; /* driver state */ | |
63 | int used; /* reference counter */ | |
64 | int argsize; /* argument size */ | |
65 | ||
66 | /* operators */ | |
c7e0b5bf | 67 | struct snd_seq_dev_ops ops; |
1da177e4 LT |
68 | |
69 | /* registred devices */ | |
70 | struct list_head dev_list; /* list of devices */ | |
71 | int num_devices; /* number of associated devices */ | |
72 | int num_init_devices; /* number of initialized devices */ | |
1a60d4c5 | 73 | struct mutex reg_mutex; |
1da177e4 LT |
74 | |
75 | struct list_head list; /* next driver */ | |
76 | }; | |
77 | ||
78 | ||
79 | static LIST_HEAD(opslist); | |
80 | static int num_ops; | |
1a60d4c5 | 81 | static DEFINE_MUTEX(ops_mutex); |
04f141a8 | 82 | #ifdef CONFIG_PROC_FS |
6581f4e7 | 83 | static struct snd_info_entry *info_entry; |
04f141a8 | 84 | #endif |
1da177e4 LT |
85 | |
86 | /* | |
87 | * prototypes | |
88 | */ | |
c7e0b5bf TI |
89 | static int snd_seq_device_free(struct snd_seq_device *dev); |
90 | static int snd_seq_device_dev_free(struct snd_device *device); | |
91 | static int snd_seq_device_dev_register(struct snd_device *device); | |
92 | static int snd_seq_device_dev_disconnect(struct snd_device *device); | |
93 | static int snd_seq_device_dev_unregister(struct snd_device *device); | |
94 | ||
95 | static int init_device(struct snd_seq_device *dev, struct ops_list *ops); | |
96 | static int free_device(struct snd_seq_device *dev, struct ops_list *ops); | |
97 | static struct ops_list *find_driver(char *id, int create_if_empty); | |
98 | static struct ops_list *create_driver(char *id); | |
99 | static void unlock_driver(struct ops_list *ops); | |
1da177e4 LT |
100 | static void remove_drivers(void); |
101 | ||
102 | /* | |
103 | * show all drivers and their status | |
104 | */ | |
105 | ||
04f141a8 | 106 | #ifdef CONFIG_PROC_FS |
c7e0b5bf TI |
107 | static void snd_seq_device_info(struct snd_info_entry *entry, |
108 | struct snd_info_buffer *buffer) | |
1da177e4 LT |
109 | { |
110 | struct list_head *head; | |
111 | ||
1a60d4c5 | 112 | mutex_lock(&ops_mutex); |
1da177e4 | 113 | list_for_each(head, &opslist) { |
c7e0b5bf | 114 | struct ops_list *ops = list_entry(head, struct ops_list, list); |
1da177e4 LT |
115 | snd_iprintf(buffer, "snd-%s%s%s%s,%d\n", |
116 | ops->id, | |
117 | ops->driver & DRIVER_LOADED ? ",loaded" : (ops->driver == DRIVER_EMPTY ? ",empty" : ""), | |
118 | ops->driver & DRIVER_REQUESTED ? ",requested" : "", | |
119 | ops->driver & DRIVER_LOCKED ? ",locked" : "", | |
120 | ops->num_devices); | |
121 | } | |
1a60d4c5 | 122 | mutex_unlock(&ops_mutex); |
1da177e4 | 123 | } |
04f141a8 | 124 | #endif |
1da177e4 LT |
125 | |
126 | /* | |
127 | * load all registered drivers (called from seq_clientmgr.c) | |
128 | */ | |
129 | ||
130 | #ifdef CONFIG_KMOD | |
131 | /* avoid auto-loading during module_init() */ | |
132 | static int snd_seq_in_init; | |
133 | void snd_seq_autoload_lock(void) | |
134 | { | |
135 | snd_seq_in_init++; | |
136 | } | |
137 | ||
138 | void snd_seq_autoload_unlock(void) | |
139 | { | |
140 | snd_seq_in_init--; | |
141 | } | |
142 | #endif | |
143 | ||
144 | void snd_seq_device_load_drivers(void) | |
145 | { | |
146 | #ifdef CONFIG_KMOD | |
147 | struct list_head *head; | |
148 | ||
149 | /* Calling request_module during module_init() | |
150 | * may cause blocking. | |
151 | */ | |
152 | if (snd_seq_in_init) | |
153 | return; | |
154 | ||
155 | if (! current->fs->root) | |
156 | return; | |
157 | ||
1a60d4c5 | 158 | mutex_lock(&ops_mutex); |
1da177e4 | 159 | list_for_each(head, &opslist) { |
c7e0b5bf | 160 | struct ops_list *ops = list_entry(head, struct ops_list, list); |
1da177e4 LT |
161 | if (! (ops->driver & DRIVER_LOADED) && |
162 | ! (ops->driver & DRIVER_REQUESTED)) { | |
163 | ops->used++; | |
1a60d4c5 | 164 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
165 | ops->driver |= DRIVER_REQUESTED; |
166 | request_module("snd-%s", ops->id); | |
1a60d4c5 | 167 | mutex_lock(&ops_mutex); |
1da177e4 LT |
168 | ops->used--; |
169 | } | |
170 | } | |
1a60d4c5 | 171 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
172 | #endif |
173 | } | |
174 | ||
175 | /* | |
176 | * register a sequencer device | |
177 | * card = card info (NULL allowed) | |
178 | * device = device number (if any) | |
179 | * id = id of driver | |
180 | * result = return pointer (NULL allowed if unnecessary) | |
181 | */ | |
c7e0b5bf TI |
182 | int snd_seq_device_new(struct snd_card *card, int device, char *id, int argsize, |
183 | struct snd_seq_device **result) | |
1da177e4 | 184 | { |
c7e0b5bf TI |
185 | struct snd_seq_device *dev; |
186 | struct ops_list *ops; | |
1da177e4 | 187 | int err; |
c7e0b5bf | 188 | static struct snd_device_ops dops = { |
1da177e4 LT |
189 | .dev_free = snd_seq_device_dev_free, |
190 | .dev_register = snd_seq_device_dev_register, | |
191 | .dev_disconnect = snd_seq_device_dev_disconnect, | |
192 | .dev_unregister = snd_seq_device_dev_unregister | |
193 | }; | |
194 | ||
195 | if (result) | |
196 | *result = NULL; | |
197 | ||
198 | snd_assert(id != NULL, return -EINVAL); | |
199 | ||
200 | ops = find_driver(id, 1); | |
201 | if (ops == NULL) | |
202 | return -ENOMEM; | |
203 | ||
ecca82b4 | 204 | dev = kzalloc(sizeof(*dev)*2 + argsize, GFP_KERNEL); |
1da177e4 LT |
205 | if (dev == NULL) { |
206 | unlock_driver(ops); | |
207 | return -ENOMEM; | |
208 | } | |
209 | ||
210 | /* set up device info */ | |
211 | dev->card = card; | |
212 | dev->device = device; | |
213 | strlcpy(dev->id, id, sizeof(dev->id)); | |
214 | dev->argsize = argsize; | |
215 | dev->status = SNDRV_SEQ_DEVICE_FREE; | |
216 | ||
217 | /* add this device to the list */ | |
1a60d4c5 | 218 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
219 | list_add_tail(&dev->list, &ops->dev_list); |
220 | ops->num_devices++; | |
1a60d4c5 | 221 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
222 | |
223 | unlock_driver(ops); | |
224 | ||
225 | if ((err = snd_device_new(card, SNDRV_DEV_SEQUENCER, dev, &dops)) < 0) { | |
226 | snd_seq_device_free(dev); | |
227 | return err; | |
228 | } | |
229 | ||
230 | if (result) | |
231 | *result = dev; | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | /* | |
237 | * free the existing device | |
238 | */ | |
c7e0b5bf | 239 | static int snd_seq_device_free(struct snd_seq_device *dev) |
1da177e4 | 240 | { |
c7e0b5bf | 241 | struct ops_list *ops; |
1da177e4 LT |
242 | |
243 | snd_assert(dev != NULL, return -EINVAL); | |
244 | ||
245 | ops = find_driver(dev->id, 0); | |
246 | if (ops == NULL) | |
247 | return -ENXIO; | |
248 | ||
249 | /* remove the device from the list */ | |
1a60d4c5 | 250 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
251 | list_del(&dev->list); |
252 | ops->num_devices--; | |
1a60d4c5 | 253 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
254 | |
255 | free_device(dev, ops); | |
256 | if (dev->private_free) | |
257 | dev->private_free(dev); | |
258 | kfree(dev); | |
259 | ||
260 | unlock_driver(ops); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
c7e0b5bf | 265 | static int snd_seq_device_dev_free(struct snd_device *device) |
1da177e4 | 266 | { |
c7e0b5bf | 267 | struct snd_seq_device *dev = device->device_data; |
1da177e4 LT |
268 | return snd_seq_device_free(dev); |
269 | } | |
270 | ||
271 | /* | |
272 | * register the device | |
273 | */ | |
c7e0b5bf | 274 | static int snd_seq_device_dev_register(struct snd_device *device) |
1da177e4 | 275 | { |
c7e0b5bf TI |
276 | struct snd_seq_device *dev = device->device_data; |
277 | struct ops_list *ops; | |
1da177e4 LT |
278 | |
279 | ops = find_driver(dev->id, 0); | |
280 | if (ops == NULL) | |
281 | return -ENOENT; | |
282 | ||
283 | /* initialize this device if the corresponding driver was | |
284 | * already loaded | |
285 | */ | |
286 | if (ops->driver & DRIVER_LOADED) | |
287 | init_device(dev, ops); | |
288 | ||
289 | unlock_driver(ops); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | /* | |
294 | * disconnect the device | |
295 | */ | |
c7e0b5bf | 296 | static int snd_seq_device_dev_disconnect(struct snd_device *device) |
1da177e4 | 297 | { |
c7e0b5bf TI |
298 | struct snd_seq_device *dev = device->device_data; |
299 | struct ops_list *ops; | |
1da177e4 LT |
300 | |
301 | ops = find_driver(dev->id, 0); | |
302 | if (ops == NULL) | |
303 | return -ENOENT; | |
304 | ||
305 | free_device(dev, ops); | |
306 | ||
307 | unlock_driver(ops); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | /* | |
312 | * unregister the existing device | |
313 | */ | |
c7e0b5bf | 314 | static int snd_seq_device_dev_unregister(struct snd_device *device) |
1da177e4 | 315 | { |
c7e0b5bf | 316 | struct snd_seq_device *dev = device->device_data; |
1da177e4 LT |
317 | return snd_seq_device_free(dev); |
318 | } | |
319 | ||
320 | /* | |
321 | * register device driver | |
322 | * id = driver id | |
323 | * entry = driver operators - duplicated to each instance | |
324 | */ | |
c7e0b5bf TI |
325 | int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry, |
326 | int argsize) | |
1da177e4 LT |
327 | { |
328 | struct list_head *head; | |
c7e0b5bf | 329 | struct ops_list *ops; |
1da177e4 LT |
330 | |
331 | if (id == NULL || entry == NULL || | |
332 | entry->init_device == NULL || entry->free_device == NULL) | |
333 | return -EINVAL; | |
334 | ||
335 | snd_seq_autoload_lock(); | |
336 | ops = find_driver(id, 1); | |
337 | if (ops == NULL) { | |
338 | snd_seq_autoload_unlock(); | |
339 | return -ENOMEM; | |
340 | } | |
341 | if (ops->driver & DRIVER_LOADED) { | |
342 | snd_printk(KERN_WARNING "driver_register: driver '%s' already exists\n", id); | |
343 | unlock_driver(ops); | |
344 | snd_seq_autoload_unlock(); | |
345 | return -EBUSY; | |
346 | } | |
347 | ||
1a60d4c5 | 348 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
349 | /* copy driver operators */ |
350 | ops->ops = *entry; | |
351 | ops->driver |= DRIVER_LOADED; | |
352 | ops->argsize = argsize; | |
353 | ||
354 | /* initialize existing devices if necessary */ | |
355 | list_for_each(head, &ops->dev_list) { | |
c7e0b5bf | 356 | struct snd_seq_device *dev = list_entry(head, struct snd_seq_device, list); |
1da177e4 LT |
357 | init_device(dev, ops); |
358 | } | |
1a60d4c5 | 359 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
360 | |
361 | unlock_driver(ops); | |
362 | snd_seq_autoload_unlock(); | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | ||
368 | /* | |
369 | * create driver record | |
370 | */ | |
c7e0b5bf | 371 | static struct ops_list * create_driver(char *id) |
1da177e4 | 372 | { |
c7e0b5bf | 373 | struct ops_list *ops; |
1da177e4 | 374 | |
59feddb2 | 375 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); |
1da177e4 LT |
376 | if (ops == NULL) |
377 | return ops; | |
1da177e4 LT |
378 | |
379 | /* set up driver entry */ | |
380 | strlcpy(ops->id, id, sizeof(ops->id)); | |
1a60d4c5 | 381 | mutex_init(&ops->reg_mutex); |
933a2efc AV |
382 | /* |
383 | * The ->reg_mutex locking rules are per-driver, so we create | |
384 | * separate per-driver lock classes: | |
385 | */ | |
386 | lockdep_set_class(&ops->reg_mutex, (struct lock_class_key *)id); | |
387 | ||
1da177e4 LT |
388 | ops->driver = DRIVER_EMPTY; |
389 | INIT_LIST_HEAD(&ops->dev_list); | |
390 | /* lock this instance */ | |
391 | ops->used = 1; | |
392 | ||
393 | /* register driver entry */ | |
1a60d4c5 | 394 | mutex_lock(&ops_mutex); |
1da177e4 LT |
395 | list_add_tail(&ops->list, &opslist); |
396 | num_ops++; | |
1a60d4c5 | 397 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
398 | |
399 | return ops; | |
400 | } | |
401 | ||
402 | ||
403 | /* | |
404 | * unregister the specified driver | |
405 | */ | |
406 | int snd_seq_device_unregister_driver(char *id) | |
407 | { | |
408 | struct list_head *head; | |
c7e0b5bf | 409 | struct ops_list *ops; |
1da177e4 LT |
410 | |
411 | ops = find_driver(id, 0); | |
412 | if (ops == NULL) | |
413 | return -ENXIO; | |
414 | if (! (ops->driver & DRIVER_LOADED) || | |
415 | (ops->driver & DRIVER_LOCKED)) { | |
c7e0b5bf TI |
416 | snd_printk(KERN_ERR "driver_unregister: cannot unload driver '%s': status=%x\n", |
417 | id, ops->driver); | |
1da177e4 LT |
418 | unlock_driver(ops); |
419 | return -EBUSY; | |
420 | } | |
421 | ||
422 | /* close and release all devices associated with this driver */ | |
1a60d4c5 | 423 | mutex_lock(&ops->reg_mutex); |
1da177e4 LT |
424 | ops->driver |= DRIVER_LOCKED; /* do not remove this driver recursively */ |
425 | list_for_each(head, &ops->dev_list) { | |
c7e0b5bf | 426 | struct snd_seq_device *dev = list_entry(head, struct snd_seq_device, list); |
1da177e4 LT |
427 | free_device(dev, ops); |
428 | } | |
429 | ||
430 | ops->driver = 0; | |
431 | if (ops->num_init_devices > 0) | |
c7e0b5bf TI |
432 | snd_printk(KERN_ERR "free_driver: init_devices > 0!! (%d)\n", |
433 | ops->num_init_devices); | |
1a60d4c5 | 434 | mutex_unlock(&ops->reg_mutex); |
1da177e4 LT |
435 | |
436 | unlock_driver(ops); | |
437 | ||
438 | /* remove empty driver entries */ | |
439 | remove_drivers(); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | ||
445 | /* | |
446 | * remove empty driver entries | |
447 | */ | |
448 | static void remove_drivers(void) | |
449 | { | |
450 | struct list_head *head; | |
451 | ||
1a60d4c5 | 452 | mutex_lock(&ops_mutex); |
1da177e4 LT |
453 | head = opslist.next; |
454 | while (head != &opslist) { | |
c7e0b5bf | 455 | struct ops_list *ops = list_entry(head, struct ops_list, list); |
1da177e4 LT |
456 | if (! (ops->driver & DRIVER_LOADED) && |
457 | ops->used == 0 && ops->num_devices == 0) { | |
458 | head = head->next; | |
459 | list_del(&ops->list); | |
460 | kfree(ops); | |
461 | num_ops--; | |
462 | } else | |
463 | head = head->next; | |
464 | } | |
1a60d4c5 | 465 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
466 | } |
467 | ||
468 | /* | |
469 | * initialize the device - call init_device operator | |
470 | */ | |
c7e0b5bf | 471 | static int init_device(struct snd_seq_device *dev, struct ops_list *ops) |
1da177e4 LT |
472 | { |
473 | if (! (ops->driver & DRIVER_LOADED)) | |
474 | return 0; /* driver is not loaded yet */ | |
475 | if (dev->status != SNDRV_SEQ_DEVICE_FREE) | |
476 | return 0; /* already initialized */ | |
477 | if (ops->argsize != dev->argsize) { | |
c7e0b5bf TI |
478 | snd_printk(KERN_ERR "incompatible device '%s' for plug-in '%s' (%d %d)\n", |
479 | dev->name, ops->id, ops->argsize, dev->argsize); | |
1da177e4 LT |
480 | return -EINVAL; |
481 | } | |
482 | if (ops->ops.init_device(dev) >= 0) { | |
483 | dev->status = SNDRV_SEQ_DEVICE_REGISTERED; | |
484 | ops->num_init_devices++; | |
485 | } else { | |
c7e0b5bf TI |
486 | snd_printk(KERN_ERR "init_device failed: %s: %s\n", |
487 | dev->name, dev->id); | |
1da177e4 LT |
488 | } |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | /* | |
494 | * release the device - call free_device operator | |
495 | */ | |
c7e0b5bf | 496 | static int free_device(struct snd_seq_device *dev, struct ops_list *ops) |
1da177e4 LT |
497 | { |
498 | int result; | |
499 | ||
500 | if (! (ops->driver & DRIVER_LOADED)) | |
501 | return 0; /* driver is not loaded yet */ | |
502 | if (dev->status != SNDRV_SEQ_DEVICE_REGISTERED) | |
503 | return 0; /* not registered */ | |
504 | if (ops->argsize != dev->argsize) { | |
c7e0b5bf TI |
505 | snd_printk(KERN_ERR "incompatible device '%s' for plug-in '%s' (%d %d)\n", |
506 | dev->name, ops->id, ops->argsize, dev->argsize); | |
1da177e4 LT |
507 | return -EINVAL; |
508 | } | |
509 | if ((result = ops->ops.free_device(dev)) >= 0 || result == -ENXIO) { | |
510 | dev->status = SNDRV_SEQ_DEVICE_FREE; | |
511 | dev->driver_data = NULL; | |
512 | ops->num_init_devices--; | |
513 | } else { | |
c7e0b5bf TI |
514 | snd_printk(KERN_ERR "free_device failed: %s: %s\n", |
515 | dev->name, dev->id); | |
1da177e4 LT |
516 | } |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | /* | |
522 | * find the matching driver with given id | |
523 | */ | |
c7e0b5bf | 524 | static struct ops_list * find_driver(char *id, int create_if_empty) |
1da177e4 LT |
525 | { |
526 | struct list_head *head; | |
527 | ||
1a60d4c5 | 528 | mutex_lock(&ops_mutex); |
1da177e4 | 529 | list_for_each(head, &opslist) { |
c7e0b5bf | 530 | struct ops_list *ops = list_entry(head, struct ops_list, list); |
1da177e4 LT |
531 | if (strcmp(ops->id, id) == 0) { |
532 | ops->used++; | |
1a60d4c5 | 533 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
534 | return ops; |
535 | } | |
536 | } | |
1a60d4c5 | 537 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
538 | if (create_if_empty) |
539 | return create_driver(id); | |
540 | return NULL; | |
541 | } | |
542 | ||
c7e0b5bf | 543 | static void unlock_driver(struct ops_list *ops) |
1da177e4 | 544 | { |
1a60d4c5 | 545 | mutex_lock(&ops_mutex); |
1da177e4 | 546 | ops->used--; |
1a60d4c5 | 547 | mutex_unlock(&ops_mutex); |
1da177e4 LT |
548 | } |
549 | ||
550 | ||
551 | /* | |
552 | * module part | |
553 | */ | |
554 | ||
555 | static int __init alsa_seq_device_init(void) | |
556 | { | |
04f141a8 | 557 | #ifdef CONFIG_PROC_FS |
c7e0b5bf TI |
558 | info_entry = snd_info_create_module_entry(THIS_MODULE, "drivers", |
559 | snd_seq_root); | |
1da177e4 LT |
560 | if (info_entry == NULL) |
561 | return -ENOMEM; | |
562 | info_entry->content = SNDRV_INFO_CONTENT_TEXT; | |
1da177e4 LT |
563 | info_entry->c.text.read = snd_seq_device_info; |
564 | if (snd_info_register(info_entry) < 0) { | |
565 | snd_info_free_entry(info_entry); | |
566 | return -ENOMEM; | |
567 | } | |
04f141a8 | 568 | #endif |
1da177e4 LT |
569 | return 0; |
570 | } | |
571 | ||
572 | static void __exit alsa_seq_device_exit(void) | |
573 | { | |
574 | remove_drivers(); | |
04f141a8 | 575 | #ifdef CONFIG_PROC_FS |
1da177e4 | 576 | snd_info_unregister(info_entry); |
04f141a8 | 577 | #endif |
1da177e4 LT |
578 | if (num_ops) |
579 | snd_printk(KERN_ERR "drivers not released (%d)\n", num_ops); | |
580 | } | |
581 | ||
582 | module_init(alsa_seq_device_init) | |
583 | module_exit(alsa_seq_device_exit) | |
584 | ||
585 | EXPORT_SYMBOL(snd_seq_device_load_drivers); | |
586 | EXPORT_SYMBOL(snd_seq_device_new); | |
587 | EXPORT_SYMBOL(snd_seq_device_register_driver); | |
588 | EXPORT_SYMBOL(snd_seq_device_unregister_driver); | |
589 | #ifdef CONFIG_KMOD | |
590 | EXPORT_SYMBOL(snd_seq_autoload_lock); | |
591 | EXPORT_SYMBOL(snd_seq_autoload_unlock); | |
592 | #endif |