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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
d886e87c TH |
3 | * Sound core. This file is composed of two parts. sound_class |
4 | * which is common to both OSS and ALSA and OSS sound core which | |
5 | * is used OSS or emulation of it. | |
6 | */ | |
7 | ||
8 | /* | |
9 | * First, the common part. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/err.h> | |
954a973c KS |
14 | #include <linux/kdev_t.h> |
15 | #include <linux/major.h> | |
3d1ee379 | 16 | #include <sound/core.h> |
d886e87c TH |
17 | |
18 | #ifdef CONFIG_SOUND_OSS_CORE | |
19 | static int __init init_oss_soundcore(void); | |
de30d36b | 20 | static void cleanup_oss_soundcore(void); |
d886e87c TH |
21 | #else |
22 | static inline int init_oss_soundcore(void) { return 0; } | |
23 | static inline void cleanup_oss_soundcore(void) { } | |
24 | #endif | |
25 | ||
d886e87c TH |
26 | MODULE_DESCRIPTION("Core sound module"); |
27 | MODULE_AUTHOR("Alan Cox"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
ff62b8e6 | 30 | static char *sound_devnode(const struct device *dev, umode_t *mode) |
7a9d56f6 | 31 | { |
954a973c KS |
32 | if (MAJOR(dev->devt) == SOUND_MAJOR) |
33 | return NULL; | |
7a9d56f6 KS |
34 | return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev)); |
35 | } | |
36 | ||
8d0cf150 IO |
37 | const struct class sound_class = { |
38 | .name = "sound", | |
39 | .devnode = sound_devnode, | |
40 | }; | |
41 | EXPORT_SYMBOL(sound_class); | |
42 | ||
d886e87c TH |
43 | static int __init init_soundcore(void) |
44 | { | |
45 | int rc; | |
46 | ||
47 | rc = init_oss_soundcore(); | |
48 | if (rc) | |
49 | return rc; | |
50 | ||
8d0cf150 IO |
51 | rc = class_register(&sound_class); |
52 | if (rc) { | |
d886e87c | 53 | cleanup_oss_soundcore(); |
8d0cf150 | 54 | return rc; |
d886e87c TH |
55 | } |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static void __exit cleanup_soundcore(void) | |
61 | { | |
62 | cleanup_oss_soundcore(); | |
8d0cf150 | 63 | class_unregister(&sound_class); |
d886e87c TH |
64 | } |
65 | ||
c181a13a | 66 | subsys_initcall(init_soundcore); |
d886e87c TH |
67 | module_exit(cleanup_soundcore); |
68 | ||
69 | ||
70 | #ifdef CONFIG_SOUND_OSS_CORE | |
71 | /* | |
72 | * OSS sound core handling. Breaks out sound functions to submodules | |
1da177e4 | 73 | * |
2f1e593d | 74 | * Author: Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
75 | * |
76 | * Fixes: | |
77 | * | |
1da177e4 LT |
78 | * -------------------- |
79 | * | |
80 | * Top level handler for the sound subsystem. Various devices can | |
81 | * plug into this. The fact they don't all go via OSS doesn't mean | |
82 | * they don't have to implement the OSS API. There is a lot of logic | |
83 | * to keeping much of the OSS weight out of the code in a compatibility | |
84 | * module, but it's up to the driver to rember to load it... | |
85 | * | |
86 | * The code provides a set of functions for registration of devices | |
87 | * by type. This is done rather than providing a single call so that | |
88 | * we can hide any future changes in the internals (eg when we go to | |
89 | * 32bit dev_t) from the modules and their interface. | |
90 | * | |
91 | * Secondly we need to allocate the dsp, dsp16 and audio devices as | |
92 | * one. Thus we misuse the chains a bit to simplify this. | |
93 | * | |
94 | * Thirdly to make it more fun and for 2.3.x and above we do all | |
95 | * of this using fine grained locking. | |
96 | * | |
97 | * FIXME: we have to resolve modules and fine grained load/unload | |
98 | * locking at some point in 2.3.x. | |
99 | */ | |
100 | ||
1da177e4 LT |
101 | #include <linux/init.h> |
102 | #include <linux/slab.h> | |
103 | #include <linux/types.h> | |
104 | #include <linux/kernel.h> | |
1da177e4 | 105 | #include <linux/sound.h> |
1da177e4 | 106 | #include <linux/kmod.h> |
1da177e4 LT |
107 | |
108 | #define SOUND_STEP 16 | |
109 | ||
1da177e4 LT |
110 | struct sound_unit |
111 | { | |
112 | int unit_minor; | |
99ac48f5 | 113 | const struct file_operations *unit_fops; |
1da177e4 LT |
114 | struct sound_unit *next; |
115 | char name[32]; | |
116 | }; | |
117 | ||
93fe4483 TH |
118 | /* |
119 | * By default, OSS sound_core claims full legacy minor range (0-255) | |
120 | * of SOUND_MAJOR to trap open attempts to any sound minor and | |
121 | * requests modules using custom sound-slot/service-* module aliases. | |
122 | * The only benefit of doing this is allowing use of custom module | |
123 | * aliases instead of the standard char-major-* ones. This behavior | |
124 | * prevents alternative OSS implementation and is scheduled to be | |
125 | * removed. | |
126 | * | |
127 | * CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss kernel | |
128 | * parameter are added to allow distros and developers to try and | |
129 | * switch to alternative implementations without needing to rebuild | |
130 | * the kernel in the meantime. If preclaim_oss is non-zero, the | |
131 | * kernel will behave the same as before. All SOUND_MAJOR minors are | |
132 | * preclaimed and the custom module aliases along with standard chrdev | |
133 | * ones are emitted if a missing device is opened. If preclaim_oss is | |
134 | * zero, sound_core only grabs what's actually in use and for missing | |
135 | * devices only the standard chrdev aliases are requested. | |
136 | * | |
137 | * All these clutters are scheduled to be removed along with | |
8f6e6041 | 138 | * sound-slot/service-* module aliases. |
93fe4483 | 139 | */ |
d248b277 | 140 | static int preclaim_oss = IS_ENABLED(CONFIG_SOUND_OSS_CORE_PRECLAIM); |
93fe4483 TH |
141 | |
142 | module_param(preclaim_oss, int, 0444); | |
143 | ||
144 | static int soundcore_open(struct inode *, struct file *); | |
145 | ||
146 | static const struct file_operations soundcore_fops = | |
147 | { | |
148 | /* We must have an owner or the module locking fails */ | |
149 | .owner = THIS_MODULE, | |
150 | .open = soundcore_open, | |
6038f373 | 151 | .llseek = noop_llseek, |
93fe4483 TH |
152 | }; |
153 | ||
1da177e4 LT |
154 | /* |
155 | * Low level list operator. Scan the ordered list, find a hole and | |
156 | * join into it. Called with the lock asserted | |
157 | */ | |
158 | ||
99ac48f5 | 159 | static int __sound_insert_unit(struct sound_unit * s, struct sound_unit **list, const struct file_operations *fops, int index, int low, int top) |
1da177e4 LT |
160 | { |
161 | int n=low; | |
162 | ||
163 | if (index < 0) { /* first free */ | |
164 | ||
165 | while (*list && (*list)->unit_minor<n) | |
166 | list=&((*list)->next); | |
167 | ||
168 | while(n<top) | |
169 | { | |
170 | /* Found a hole ? */ | |
171 | if(*list==NULL || (*list)->unit_minor>n) | |
172 | break; | |
173 | list=&((*list)->next); | |
174 | n+=SOUND_STEP; | |
175 | } | |
176 | ||
177 | if(n>=top) | |
178 | return -ENOENT; | |
179 | } else { | |
180 | n = low+(index*16); | |
181 | while (*list) { | |
182 | if ((*list)->unit_minor==n) | |
183 | return -EBUSY; | |
184 | if ((*list)->unit_minor>n) | |
185 | break; | |
186 | list=&((*list)->next); | |
187 | } | |
188 | } | |
189 | ||
190 | /* | |
191 | * Fill it in | |
192 | */ | |
193 | ||
194 | s->unit_minor=n; | |
195 | s->unit_fops=fops; | |
196 | ||
197 | /* | |
198 | * Link it | |
199 | */ | |
200 | ||
201 | s->next=*list; | |
202 | *list=s; | |
203 | ||
204 | ||
205 | return n; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Remove a node from the chain. Called with the lock asserted | |
210 | */ | |
211 | ||
212 | static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit) | |
213 | { | |
214 | while(*list) | |
215 | { | |
216 | struct sound_unit *p=*list; | |
217 | if(p->unit_minor==unit) | |
218 | { | |
219 | *list=p->next; | |
220 | return p; | |
221 | } | |
222 | list=&(p->next); | |
223 | } | |
224 | printk(KERN_ERR "Sound device %d went missing!\n", unit); | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | /* | |
229 | * This lock guards the sound loader list. | |
230 | */ | |
231 | ||
232 | static DEFINE_SPINLOCK(sound_loader_lock); | |
233 | ||
234 | /* | |
235 | * Allocate the controlling structure and add it to the sound driver | |
236 | * list. Acquires locks as needed | |
237 | */ | |
238 | ||
99ac48f5 | 239 | static int sound_insert_unit(struct sound_unit **list, const struct file_operations *fops, int index, int low, int top, const char *name, umode_t mode, struct device *dev) |
1da177e4 LT |
240 | { |
241 | struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
242 | int r; | |
243 | ||
244 | if (!s) | |
245 | return -ENOMEM; | |
93fe4483 | 246 | |
1da177e4 | 247 | spin_lock(&sound_loader_lock); |
93fe4483 | 248 | retry: |
1da177e4 LT |
249 | r = __sound_insert_unit(s, list, fops, index, low, top); |
250 | spin_unlock(&sound_loader_lock); | |
251 | ||
252 | if (r < 0) | |
253 | goto fail; | |
254 | else if (r < SOUND_STEP) | |
255 | sprintf(s->name, "sound/%s", name); | |
256 | else | |
257 | sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP); | |
258 | ||
93fe4483 TH |
259 | if (!preclaim_oss) { |
260 | /* | |
261 | * Something else might have grabbed the minor. If | |
262 | * first free slot is requested, rescan with @low set | |
263 | * to the next unit; otherwise, -EBUSY. | |
264 | */ | |
265 | r = __register_chrdev(SOUND_MAJOR, s->unit_minor, 1, s->name, | |
266 | &soundcore_fops); | |
267 | if (r < 0) { | |
268 | spin_lock(&sound_loader_lock); | |
269 | __sound_remove_unit(list, s->unit_minor); | |
270 | if (index < 0) { | |
271 | low = s->unit_minor + SOUND_STEP; | |
272 | goto retry; | |
273 | } | |
274 | spin_unlock(&sound_loader_lock); | |
c7cd7c74 WW |
275 | r = -EBUSY; |
276 | goto fail; | |
93fe4483 TH |
277 | } |
278 | } | |
279 | ||
8d0cf150 | 280 | device_create(&sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), |
02aa2a37 | 281 | NULL, "%s", s->name+6); |
93fe4483 | 282 | return s->unit_minor; |
1da177e4 | 283 | |
93fe4483 | 284 | fail: |
1da177e4 LT |
285 | kfree(s); |
286 | return r; | |
287 | } | |
288 | ||
289 | /* | |
290 | * Remove a unit. Acquires locks as needed. The drivers MUST have | |
291 | * completed the removal before their file operations become | |
292 | * invalid. | |
293 | */ | |
294 | ||
295 | static void sound_remove_unit(struct sound_unit **list, int unit) | |
296 | { | |
297 | struct sound_unit *p; | |
298 | ||
299 | spin_lock(&sound_loader_lock); | |
300 | p = __sound_remove_unit(list, unit); | |
301 | spin_unlock(&sound_loader_lock); | |
302 | if (p) { | |
93fe4483 TH |
303 | if (!preclaim_oss) |
304 | __unregister_chrdev(SOUND_MAJOR, p->unit_minor, 1, | |
305 | p->name); | |
8d0cf150 | 306 | device_destroy(&sound_class, MKDEV(SOUND_MAJOR, p->unit_minor)); |
1da177e4 LT |
307 | kfree(p); |
308 | } | |
309 | } | |
310 | ||
311 | /* | |
312 | * Allocations | |
313 | * | |
314 | * 0 *16 Mixers | |
315 | * 1 *8 Sequencers | |
316 | * 2 *16 Midi | |
317 | * 3 *16 DSP | |
318 | * 4 *16 SunDSP | |
319 | * 5 *16 DSP16 | |
320 | * 6 -- sndstat (obsolete) | |
321 | * 7 *16 unused | |
322 | * 8 -- alternate sequencer (see above) | |
323 | * 9 *16 raw synthesizer access | |
324 | * 10 *16 unused | |
325 | * 11 *16 unused | |
326 | * 12 *16 unused | |
327 | * 13 *16 unused | |
328 | * 14 *16 unused | |
329 | * 15 *16 unused | |
330 | */ | |
331 | ||
332 | static struct sound_unit *chains[SOUND_STEP]; | |
333 | ||
334 | /** | |
d568121c | 335 | * register_sound_special_device - register a special sound node |
1da177e4 LT |
336 | * @fops: File operations for the driver |
337 | * @unit: Unit number to allocate | |
d568121c | 338 | * @dev: device pointer |
1da177e4 LT |
339 | * |
340 | * Allocate a special sound device by minor number from the sound | |
eb7c06e8 YB |
341 | * subsystem. |
342 | * | |
343 | * Return: The allocated number is returned on success. On failure, | |
1da177e4 LT |
344 | * a negative error code is returned. |
345 | */ | |
346 | ||
99ac48f5 | 347 | int register_sound_special_device(const struct file_operations *fops, int unit, |
d568121c | 348 | struct device *dev) |
1da177e4 LT |
349 | { |
350 | const int chain = unit % SOUND_STEP; | |
2abb8017 | 351 | int max_unit = 256; |
1da177e4 LT |
352 | const char *name; |
353 | char _name[16]; | |
354 | ||
355 | switch (chain) { | |
356 | case 0: | |
357 | name = "mixer"; | |
358 | break; | |
359 | case 1: | |
360 | name = "sequencer"; | |
361 | if (unit >= SOUND_STEP) | |
362 | goto __unknown; | |
363 | max_unit = unit + 1; | |
364 | break; | |
365 | case 2: | |
366 | name = "midi"; | |
367 | break; | |
368 | case 3: | |
369 | name = "dsp"; | |
370 | break; | |
371 | case 4: | |
372 | name = "audio"; | |
373 | break; | |
848669da TI |
374 | case 5: |
375 | name = "dspW"; | |
376 | break; | |
1da177e4 LT |
377 | case 8: |
378 | name = "sequencer2"; | |
379 | if (unit >= SOUND_STEP) | |
380 | goto __unknown; | |
381 | max_unit = unit + 1; | |
382 | break; | |
383 | case 9: | |
384 | name = "dmmidi"; | |
385 | break; | |
386 | case 10: | |
387 | name = "dmfm"; | |
388 | break; | |
389 | case 12: | |
390 | name = "adsp"; | |
391 | break; | |
392 | case 13: | |
393 | name = "amidi"; | |
394 | break; | |
395 | case 14: | |
396 | name = "admmidi"; | |
397 | break; | |
398 | default: | |
399 | { | |
400 | __unknown: | |
401 | sprintf(_name, "unknown%d", chain); | |
402 | if (unit >= SOUND_STEP) | |
403 | strcat(_name, "-"); | |
404 | name = _name; | |
405 | } | |
406 | break; | |
407 | } | |
408 | return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit, | |
6a73cf46 | 409 | name, 0600, dev); |
1da177e4 LT |
410 | } |
411 | ||
d568121c TI |
412 | EXPORT_SYMBOL(register_sound_special_device); |
413 | ||
99ac48f5 | 414 | int register_sound_special(const struct file_operations *fops, int unit) |
d568121c TI |
415 | { |
416 | return register_sound_special_device(fops, unit, NULL); | |
417 | } | |
418 | ||
1da177e4 LT |
419 | EXPORT_SYMBOL(register_sound_special); |
420 | ||
421 | /** | |
422 | * register_sound_mixer - register a mixer device | |
423 | * @fops: File operations for the driver | |
424 | * @dev: Unit number to allocate | |
425 | * | |
426 | * Allocate a mixer device. Unit is the number of the mixer requested. | |
eb7c06e8 YB |
427 | * Pass -1 to request the next free mixer unit. |
428 | * | |
429 | * Return: On success, the allocated number is returned. On failure, | |
430 | * a negative error code is returned. | |
1da177e4 LT |
431 | */ |
432 | ||
99ac48f5 | 433 | int register_sound_mixer(const struct file_operations *fops, int dev) |
1da177e4 LT |
434 | { |
435 | return sound_insert_unit(&chains[0], fops, dev, 0, 128, | |
6a73cf46 | 436 | "mixer", 0600, NULL); |
1da177e4 LT |
437 | } |
438 | ||
439 | EXPORT_SYMBOL(register_sound_mixer); | |
440 | ||
1da177e4 LT |
441 | /* |
442 | * DSP's are registered as a triple. Register only one and cheat | |
443 | * in open - see below. | |
444 | */ | |
445 | ||
446 | /** | |
447 | * register_sound_dsp - register a DSP device | |
448 | * @fops: File operations for the driver | |
449 | * @dev: Unit number to allocate | |
450 | * | |
451 | * Allocate a DSP device. Unit is the number of the DSP requested. | |
eb7c06e8 | 452 | * Pass -1 to request the next free DSP unit. |
1da177e4 LT |
453 | * |
454 | * This function allocates both the audio and dsp device entries together | |
455 | * and will always allocate them as a matching pair - eg dsp3/audio3 | |
eb7c06e8 YB |
456 | * |
457 | * Return: On success, the allocated number is returned. On failure, | |
458 | * a negative error code is returned. | |
1da177e4 LT |
459 | */ |
460 | ||
99ac48f5 | 461 | int register_sound_dsp(const struct file_operations *fops, int dev) |
1da177e4 LT |
462 | { |
463 | return sound_insert_unit(&chains[3], fops, dev, 3, 131, | |
6a73cf46 | 464 | "dsp", 0600, NULL); |
1da177e4 LT |
465 | } |
466 | ||
467 | EXPORT_SYMBOL(register_sound_dsp); | |
468 | ||
1da177e4 LT |
469 | /** |
470 | * unregister_sound_special - unregister a special sound device | |
471 | * @unit: unit number to allocate | |
472 | * | |
473 | * Release a sound device that was allocated with | |
474 | * register_sound_special(). The unit passed is the return value from | |
475 | * the register function. | |
476 | */ | |
477 | ||
478 | ||
479 | void unregister_sound_special(int unit) | |
480 | { | |
481 | sound_remove_unit(&chains[unit % SOUND_STEP], unit); | |
482 | } | |
483 | ||
484 | EXPORT_SYMBOL(unregister_sound_special); | |
485 | ||
486 | /** | |
487 | * unregister_sound_mixer - unregister a mixer | |
488 | * @unit: unit number to allocate | |
489 | * | |
490 | * Release a sound device that was allocated with register_sound_mixer(). | |
491 | * The unit passed is the return value from the register function. | |
492 | */ | |
493 | ||
494 | void unregister_sound_mixer(int unit) | |
495 | { | |
496 | sound_remove_unit(&chains[0], unit); | |
497 | } | |
498 | ||
499 | EXPORT_SYMBOL(unregister_sound_mixer); | |
500 | ||
1da177e4 LT |
501 | /** |
502 | * unregister_sound_dsp - unregister a DSP device | |
503 | * @unit: unit number to allocate | |
504 | * | |
505 | * Release a sound device that was allocated with register_sound_dsp(). | |
506 | * The unit passed is the return value from the register function. | |
507 | * | |
508 | * Both of the allocated units are released together automatically. | |
509 | */ | |
510 | ||
511 | void unregister_sound_dsp(int unit) | |
512 | { | |
a39c4ad1 | 513 | sound_remove_unit(&chains[3], unit); |
1da177e4 LT |
514 | } |
515 | ||
516 | ||
517 | EXPORT_SYMBOL(unregister_sound_dsp); | |
518 | ||
1da177e4 LT |
519 | static struct sound_unit *__look_for_unit(int chain, int unit) |
520 | { | |
521 | struct sound_unit *s; | |
522 | ||
523 | s=chains[chain]; | |
524 | while(s && s->unit_minor <= unit) | |
525 | { | |
526 | if(s->unit_minor==unit) | |
527 | return s; | |
528 | s=s->next; | |
529 | } | |
530 | return NULL; | |
531 | } | |
532 | ||
a39c4ad1 | 533 | static int soundcore_open(struct inode *inode, struct file *file) |
1da177e4 LT |
534 | { |
535 | int chain; | |
536 | int unit = iminor(inode); | |
537 | struct sound_unit *s; | |
99ac48f5 | 538 | const struct file_operations *new_fops = NULL; |
1da177e4 LT |
539 | |
540 | chain=unit&0x0F; | |
541 | if(chain==4 || chain==5) /* dsp/audio/dsp16 */ | |
542 | { | |
543 | unit&=0xF0; | |
544 | unit|=3; | |
545 | chain=3; | |
546 | } | |
547 | ||
548 | spin_lock(&sound_loader_lock); | |
549 | s = __look_for_unit(chain, unit); | |
550 | if (s) | |
551 | new_fops = fops_get(s->unit_fops); | |
93fe4483 | 552 | if (preclaim_oss && !new_fops) { |
1da177e4 | 553 | spin_unlock(&sound_loader_lock); |
0a848680 | 554 | |
1da177e4 LT |
555 | /* |
556 | * Please, don't change this order or code. | |
557 | * For ALSA slot means soundcard and OSS emulation code | |
558 | * comes as add-on modules which aren't depend on | |
559 | * ALSA toplevel modules for soundcards, thus we need | |
560 | * load them at first. [Jaroslav Kysela <perex@jcu.cz>] | |
561 | */ | |
562 | request_module("sound-slot-%i", unit>>4); | |
563 | request_module("sound-service-%i-%i", unit>>4, chain); | |
0a848680 TH |
564 | |
565 | /* | |
566 | * sound-slot/service-* module aliases are scheduled | |
567 | * for removal in favor of the standard char-major-* | |
568 | * module aliases. For the time being, generate both | |
569 | * the legacy and standard module aliases to ease | |
570 | * transition. | |
571 | */ | |
572 | if (request_module("char-major-%d-%d", SOUND_MAJOR, unit) > 0) | |
573 | request_module("char-major-%d", SOUND_MAJOR); | |
574 | ||
1da177e4 LT |
575 | spin_lock(&sound_loader_lock); |
576 | s = __look_for_unit(chain, unit); | |
577 | if (s) | |
578 | new_fops = fops_get(s->unit_fops); | |
579 | } | |
e84f9e57 | 580 | spin_unlock(&sound_loader_lock); |
171d9f7d | 581 | |
e52b78f8 MT |
582 | if (!new_fops) |
583 | return -ENODEV; | |
171d9f7d | 584 | |
e52b78f8 MT |
585 | /* |
586 | * We rely upon the fact that we can't be unloaded while the | |
587 | * subdriver is there. | |
588 | */ | |
589 | replace_fops(file, new_fops); | |
590 | ||
591 | if (!file->f_op->open) | |
592 | return -ENODEV; | |
593 | ||
594 | return file->f_op->open(inode, file); | |
1da177e4 LT |
595 | } |
596 | ||
1da177e4 LT |
597 | MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); |
598 | ||
de30d36b | 599 | static void cleanup_oss_soundcore(void) |
1da177e4 LT |
600 | { |
601 | /* We have nothing to really do here - we know the lists must be | |
602 | empty */ | |
603 | unregister_chrdev(SOUND_MAJOR, "sound"); | |
1da177e4 LT |
604 | } |
605 | ||
d886e87c | 606 | static int __init init_oss_soundcore(void) |
1da177e4 | 607 | { |
93fe4483 | 608 | if (preclaim_oss && |
cb68429d | 609 | register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops) < 0) { |
1da177e4 LT |
610 | printk(KERN_ERR "soundcore: sound device already in use.\n"); |
611 | return -EBUSY; | |
612 | } | |
1da177e4 LT |
613 | |
614 | return 0; | |
615 | } | |
616 | ||
d886e87c | 617 | #endif /* CONFIG_SOUND_OSS_CORE */ |