Commit | Line | Data |
---|---|---|
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 | ||
26 | struct class *sound_class; | |
27 | EXPORT_SYMBOL(sound_class); | |
28 | ||
29 | MODULE_DESCRIPTION("Core sound module"); | |
30 | MODULE_AUTHOR("Alan Cox"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
ff62b8e6 | 33 | static char *sound_devnode(const struct device *dev, umode_t *mode) |
7a9d56f6 | 34 | { |
954a973c KS |
35 | if (MAJOR(dev->devt) == SOUND_MAJOR) |
36 | return NULL; | |
7a9d56f6 KS |
37 | return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev)); |
38 | } | |
39 | ||
d886e87c TH |
40 | static int __init init_soundcore(void) |
41 | { | |
42 | int rc; | |
43 | ||
44 | rc = init_oss_soundcore(); | |
45 | if (rc) | |
46 | return rc; | |
47 | ||
48 | sound_class = class_create(THIS_MODULE, "sound"); | |
49 | if (IS_ERR(sound_class)) { | |
50 | cleanup_oss_soundcore(); | |
51 | return PTR_ERR(sound_class); | |
52 | } | |
53 | ||
e454cea2 | 54 | sound_class->devnode = sound_devnode; |
7a9d56f6 | 55 | |
d886e87c TH |
56 | return 0; |
57 | } | |
58 | ||
59 | static void __exit cleanup_soundcore(void) | |
60 | { | |
61 | cleanup_oss_soundcore(); | |
62 | class_destroy(sound_class); | |
63 | } | |
64 | ||
c181a13a | 65 | subsys_initcall(init_soundcore); |
d886e87c TH |
66 | module_exit(cleanup_soundcore); |
67 | ||
68 | ||
69 | #ifdef CONFIG_SOUND_OSS_CORE | |
70 | /* | |
71 | * OSS sound core handling. Breaks out sound functions to submodules | |
1da177e4 | 72 | * |
2f1e593d | 73 | * Author: Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
74 | * |
75 | * Fixes: | |
76 | * | |
1da177e4 LT |
77 | * -------------------- |
78 | * | |
79 | * Top level handler for the sound subsystem. Various devices can | |
80 | * plug into this. The fact they don't all go via OSS doesn't mean | |
81 | * they don't have to implement the OSS API. There is a lot of logic | |
82 | * to keeping much of the OSS weight out of the code in a compatibility | |
83 | * module, but it's up to the driver to rember to load it... | |
84 | * | |
85 | * The code provides a set of functions for registration of devices | |
86 | * by type. This is done rather than providing a single call so that | |
87 | * we can hide any future changes in the internals (eg when we go to | |
88 | * 32bit dev_t) from the modules and their interface. | |
89 | * | |
90 | * Secondly we need to allocate the dsp, dsp16 and audio devices as | |
91 | * one. Thus we misuse the chains a bit to simplify this. | |
92 | * | |
93 | * Thirdly to make it more fun and for 2.3.x and above we do all | |
94 | * of this using fine grained locking. | |
95 | * | |
96 | * FIXME: we have to resolve modules and fine grained load/unload | |
97 | * locking at some point in 2.3.x. | |
98 | */ | |
99 | ||
1da177e4 LT |
100 | #include <linux/init.h> |
101 | #include <linux/slab.h> | |
102 | #include <linux/types.h> | |
103 | #include <linux/kernel.h> | |
1da177e4 | 104 | #include <linux/sound.h> |
1da177e4 | 105 | #include <linux/kmod.h> |
1da177e4 LT |
106 | |
107 | #define SOUND_STEP 16 | |
108 | ||
1da177e4 LT |
109 | struct sound_unit |
110 | { | |
111 | int unit_minor; | |
99ac48f5 | 112 | const struct file_operations *unit_fops; |
1da177e4 LT |
113 | struct sound_unit *next; |
114 | char name[32]; | |
115 | }; | |
116 | ||
93fe4483 TH |
117 | /* |
118 | * By default, OSS sound_core claims full legacy minor range (0-255) | |
119 | * of SOUND_MAJOR to trap open attempts to any sound minor and | |
120 | * requests modules using custom sound-slot/service-* module aliases. | |
121 | * The only benefit of doing this is allowing use of custom module | |
122 | * aliases instead of the standard char-major-* ones. This behavior | |
123 | * prevents alternative OSS implementation and is scheduled to be | |
124 | * removed. | |
125 | * | |
126 | * CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss kernel | |
127 | * parameter are added to allow distros and developers to try and | |
128 | * switch to alternative implementations without needing to rebuild | |
129 | * the kernel in the meantime. If preclaim_oss is non-zero, the | |
130 | * kernel will behave the same as before. All SOUND_MAJOR minors are | |
131 | * preclaimed and the custom module aliases along with standard chrdev | |
132 | * ones are emitted if a missing device is opened. If preclaim_oss is | |
133 | * zero, sound_core only grabs what's actually in use and for missing | |
134 | * devices only the standard chrdev aliases are requested. | |
135 | * | |
136 | * All these clutters are scheduled to be removed along with | |
8f6e6041 | 137 | * sound-slot/service-* module aliases. |
93fe4483 | 138 | */ |
d248b277 | 139 | static int preclaim_oss = IS_ENABLED(CONFIG_SOUND_OSS_CORE_PRECLAIM); |
93fe4483 TH |
140 | |
141 | module_param(preclaim_oss, int, 0444); | |
142 | ||
143 | static int soundcore_open(struct inode *, struct file *); | |
144 | ||
145 | static const struct file_operations soundcore_fops = | |
146 | { | |
147 | /* We must have an owner or the module locking fails */ | |
148 | .owner = THIS_MODULE, | |
149 | .open = soundcore_open, | |
6038f373 | 150 | .llseek = noop_llseek, |
93fe4483 TH |
151 | }; |
152 | ||
1da177e4 LT |
153 | /* |
154 | * Low level list operator. Scan the ordered list, find a hole and | |
155 | * join into it. Called with the lock asserted | |
156 | */ | |
157 | ||
99ac48f5 | 158 | 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 |
159 | { |
160 | int n=low; | |
161 | ||
162 | if (index < 0) { /* first free */ | |
163 | ||
164 | while (*list && (*list)->unit_minor<n) | |
165 | list=&((*list)->next); | |
166 | ||
167 | while(n<top) | |
168 | { | |
169 | /* Found a hole ? */ | |
170 | if(*list==NULL || (*list)->unit_minor>n) | |
171 | break; | |
172 | list=&((*list)->next); | |
173 | n+=SOUND_STEP; | |
174 | } | |
175 | ||
176 | if(n>=top) | |
177 | return -ENOENT; | |
178 | } else { | |
179 | n = low+(index*16); | |
180 | while (*list) { | |
181 | if ((*list)->unit_minor==n) | |
182 | return -EBUSY; | |
183 | if ((*list)->unit_minor>n) | |
184 | break; | |
185 | list=&((*list)->next); | |
186 | } | |
187 | } | |
188 | ||
189 | /* | |
190 | * Fill it in | |
191 | */ | |
192 | ||
193 | s->unit_minor=n; | |
194 | s->unit_fops=fops; | |
195 | ||
196 | /* | |
197 | * Link it | |
198 | */ | |
199 | ||
200 | s->next=*list; | |
201 | *list=s; | |
202 | ||
203 | ||
204 | return n; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Remove a node from the chain. Called with the lock asserted | |
209 | */ | |
210 | ||
211 | static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit) | |
212 | { | |
213 | while(*list) | |
214 | { | |
215 | struct sound_unit *p=*list; | |
216 | if(p->unit_minor==unit) | |
217 | { | |
218 | *list=p->next; | |
219 | return p; | |
220 | } | |
221 | list=&(p->next); | |
222 | } | |
223 | printk(KERN_ERR "Sound device %d went missing!\n", unit); | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | /* | |
228 | * This lock guards the sound loader list. | |
229 | */ | |
230 | ||
231 | static DEFINE_SPINLOCK(sound_loader_lock); | |
232 | ||
233 | /* | |
234 | * Allocate the controlling structure and add it to the sound driver | |
235 | * list. Acquires locks as needed | |
236 | */ | |
237 | ||
99ac48f5 | 238 | 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 |
239 | { |
240 | struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
241 | int r; | |
242 | ||
243 | if (!s) | |
244 | return -ENOMEM; | |
93fe4483 | 245 | |
1da177e4 | 246 | spin_lock(&sound_loader_lock); |
93fe4483 | 247 | retry: |
1da177e4 LT |
248 | r = __sound_insert_unit(s, list, fops, index, low, top); |
249 | spin_unlock(&sound_loader_lock); | |
250 | ||
251 | if (r < 0) | |
252 | goto fail; | |
253 | else if (r < SOUND_STEP) | |
254 | sprintf(s->name, "sound/%s", name); | |
255 | else | |
256 | sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP); | |
257 | ||
93fe4483 TH |
258 | if (!preclaim_oss) { |
259 | /* | |
260 | * Something else might have grabbed the minor. If | |
261 | * first free slot is requested, rescan with @low set | |
262 | * to the next unit; otherwise, -EBUSY. | |
263 | */ | |
264 | r = __register_chrdev(SOUND_MAJOR, s->unit_minor, 1, s->name, | |
265 | &soundcore_fops); | |
266 | if (r < 0) { | |
267 | spin_lock(&sound_loader_lock); | |
268 | __sound_remove_unit(list, s->unit_minor); | |
269 | if (index < 0) { | |
270 | low = s->unit_minor + SOUND_STEP; | |
271 | goto retry; | |
272 | } | |
273 | spin_unlock(&sound_loader_lock); | |
c7cd7c74 WW |
274 | r = -EBUSY; |
275 | goto fail; | |
93fe4483 TH |
276 | } |
277 | } | |
278 | ||
abe9ab8f | 279 | device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), |
02aa2a37 | 280 | NULL, "%s", s->name+6); |
93fe4483 | 281 | return s->unit_minor; |
1da177e4 | 282 | |
93fe4483 | 283 | fail: |
1da177e4 LT |
284 | kfree(s); |
285 | return r; | |
286 | } | |
287 | ||
288 | /* | |
289 | * Remove a unit. Acquires locks as needed. The drivers MUST have | |
290 | * completed the removal before their file operations become | |
291 | * invalid. | |
292 | */ | |
293 | ||
294 | static void sound_remove_unit(struct sound_unit **list, int unit) | |
295 | { | |
296 | struct sound_unit *p; | |
297 | ||
298 | spin_lock(&sound_loader_lock); | |
299 | p = __sound_remove_unit(list, unit); | |
300 | spin_unlock(&sound_loader_lock); | |
301 | if (p) { | |
93fe4483 TH |
302 | if (!preclaim_oss) |
303 | __unregister_chrdev(SOUND_MAJOR, p->unit_minor, 1, | |
304 | p->name); | |
d80f19fa | 305 | device_destroy(sound_class, MKDEV(SOUND_MAJOR, p->unit_minor)); |
1da177e4 LT |
306 | kfree(p); |
307 | } | |
308 | } | |
309 | ||
310 | /* | |
311 | * Allocations | |
312 | * | |
313 | * 0 *16 Mixers | |
314 | * 1 *8 Sequencers | |
315 | * 2 *16 Midi | |
316 | * 3 *16 DSP | |
317 | * 4 *16 SunDSP | |
318 | * 5 *16 DSP16 | |
319 | * 6 -- sndstat (obsolete) | |
320 | * 7 *16 unused | |
321 | * 8 -- alternate sequencer (see above) | |
322 | * 9 *16 raw synthesizer access | |
323 | * 10 *16 unused | |
324 | * 11 *16 unused | |
325 | * 12 *16 unused | |
326 | * 13 *16 unused | |
327 | * 14 *16 unused | |
328 | * 15 *16 unused | |
329 | */ | |
330 | ||
331 | static struct sound_unit *chains[SOUND_STEP]; | |
332 | ||
333 | /** | |
d568121c | 334 | * register_sound_special_device - register a special sound node |
1da177e4 LT |
335 | * @fops: File operations for the driver |
336 | * @unit: Unit number to allocate | |
d568121c | 337 | * @dev: device pointer |
1da177e4 LT |
338 | * |
339 | * Allocate a special sound device by minor number from the sound | |
eb7c06e8 YB |
340 | * subsystem. |
341 | * | |
342 | * Return: The allocated number is returned on success. On failure, | |
1da177e4 LT |
343 | * a negative error code is returned. |
344 | */ | |
345 | ||
99ac48f5 | 346 | int register_sound_special_device(const struct file_operations *fops, int unit, |
d568121c | 347 | struct device *dev) |
1da177e4 LT |
348 | { |
349 | const int chain = unit % SOUND_STEP; | |
2abb8017 | 350 | int max_unit = 256; |
1da177e4 LT |
351 | const char *name; |
352 | char _name[16]; | |
353 | ||
354 | switch (chain) { | |
355 | case 0: | |
356 | name = "mixer"; | |
357 | break; | |
358 | case 1: | |
359 | name = "sequencer"; | |
360 | if (unit >= SOUND_STEP) | |
361 | goto __unknown; | |
362 | max_unit = unit + 1; | |
363 | break; | |
364 | case 2: | |
365 | name = "midi"; | |
366 | break; | |
367 | case 3: | |
368 | name = "dsp"; | |
369 | break; | |
370 | case 4: | |
371 | name = "audio"; | |
372 | break; | |
848669da TI |
373 | case 5: |
374 | name = "dspW"; | |
375 | break; | |
1da177e4 LT |
376 | case 8: |
377 | name = "sequencer2"; | |
378 | if (unit >= SOUND_STEP) | |
379 | goto __unknown; | |
380 | max_unit = unit + 1; | |
381 | break; | |
382 | case 9: | |
383 | name = "dmmidi"; | |
384 | break; | |
385 | case 10: | |
386 | name = "dmfm"; | |
387 | break; | |
388 | case 12: | |
389 | name = "adsp"; | |
390 | break; | |
391 | case 13: | |
392 | name = "amidi"; | |
393 | break; | |
394 | case 14: | |
395 | name = "admmidi"; | |
396 | break; | |
397 | default: | |
398 | { | |
399 | __unknown: | |
400 | sprintf(_name, "unknown%d", chain); | |
401 | if (unit >= SOUND_STEP) | |
402 | strcat(_name, "-"); | |
403 | name = _name; | |
404 | } | |
405 | break; | |
406 | } | |
407 | return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit, | |
6a73cf46 | 408 | name, 0600, dev); |
1da177e4 LT |
409 | } |
410 | ||
d568121c TI |
411 | EXPORT_SYMBOL(register_sound_special_device); |
412 | ||
99ac48f5 | 413 | int register_sound_special(const struct file_operations *fops, int unit) |
d568121c TI |
414 | { |
415 | return register_sound_special_device(fops, unit, NULL); | |
416 | } | |
417 | ||
1da177e4 LT |
418 | EXPORT_SYMBOL(register_sound_special); |
419 | ||
420 | /** | |
421 | * register_sound_mixer - register a mixer device | |
422 | * @fops: File operations for the driver | |
423 | * @dev: Unit number to allocate | |
424 | * | |
425 | * Allocate a mixer device. Unit is the number of the mixer requested. | |
eb7c06e8 YB |
426 | * Pass -1 to request the next free mixer unit. |
427 | * | |
428 | * Return: On success, the allocated number is returned. On failure, | |
429 | * a negative error code is returned. | |
1da177e4 LT |
430 | */ |
431 | ||
99ac48f5 | 432 | int register_sound_mixer(const struct file_operations *fops, int dev) |
1da177e4 LT |
433 | { |
434 | return sound_insert_unit(&chains[0], fops, dev, 0, 128, | |
6a73cf46 | 435 | "mixer", 0600, NULL); |
1da177e4 LT |
436 | } |
437 | ||
438 | EXPORT_SYMBOL(register_sound_mixer); | |
439 | ||
1da177e4 LT |
440 | /* |
441 | * DSP's are registered as a triple. Register only one and cheat | |
442 | * in open - see below. | |
443 | */ | |
444 | ||
445 | /** | |
446 | * register_sound_dsp - register a DSP device | |
447 | * @fops: File operations for the driver | |
448 | * @dev: Unit number to allocate | |
449 | * | |
450 | * Allocate a DSP device. Unit is the number of the DSP requested. | |
eb7c06e8 | 451 | * Pass -1 to request the next free DSP unit. |
1da177e4 LT |
452 | * |
453 | * This function allocates both the audio and dsp device entries together | |
454 | * and will always allocate them as a matching pair - eg dsp3/audio3 | |
eb7c06e8 YB |
455 | * |
456 | * Return: On success, the allocated number is returned. On failure, | |
457 | * a negative error code is returned. | |
1da177e4 LT |
458 | */ |
459 | ||
99ac48f5 | 460 | int register_sound_dsp(const struct file_operations *fops, int dev) |
1da177e4 LT |
461 | { |
462 | return sound_insert_unit(&chains[3], fops, dev, 3, 131, | |
6a73cf46 | 463 | "dsp", 0600, NULL); |
1da177e4 LT |
464 | } |
465 | ||
466 | EXPORT_SYMBOL(register_sound_dsp); | |
467 | ||
1da177e4 LT |
468 | /** |
469 | * unregister_sound_special - unregister a special sound device | |
470 | * @unit: unit number to allocate | |
471 | * | |
472 | * Release a sound device that was allocated with | |
473 | * register_sound_special(). The unit passed is the return value from | |
474 | * the register function. | |
475 | */ | |
476 | ||
477 | ||
478 | void unregister_sound_special(int unit) | |
479 | { | |
480 | sound_remove_unit(&chains[unit % SOUND_STEP], unit); | |
481 | } | |
482 | ||
483 | EXPORT_SYMBOL(unregister_sound_special); | |
484 | ||
485 | /** | |
486 | * unregister_sound_mixer - unregister a mixer | |
487 | * @unit: unit number to allocate | |
488 | * | |
489 | * Release a sound device that was allocated with register_sound_mixer(). | |
490 | * The unit passed is the return value from the register function. | |
491 | */ | |
492 | ||
493 | void unregister_sound_mixer(int unit) | |
494 | { | |
495 | sound_remove_unit(&chains[0], unit); | |
496 | } | |
497 | ||
498 | EXPORT_SYMBOL(unregister_sound_mixer); | |
499 | ||
1da177e4 LT |
500 | /** |
501 | * unregister_sound_dsp - unregister a DSP device | |
502 | * @unit: unit number to allocate | |
503 | * | |
504 | * Release a sound device that was allocated with register_sound_dsp(). | |
505 | * The unit passed is the return value from the register function. | |
506 | * | |
507 | * Both of the allocated units are released together automatically. | |
508 | */ | |
509 | ||
510 | void unregister_sound_dsp(int unit) | |
511 | { | |
a39c4ad1 | 512 | sound_remove_unit(&chains[3], unit); |
1da177e4 LT |
513 | } |
514 | ||
515 | ||
516 | EXPORT_SYMBOL(unregister_sound_dsp); | |
517 | ||
1da177e4 LT |
518 | static struct sound_unit *__look_for_unit(int chain, int unit) |
519 | { | |
520 | struct sound_unit *s; | |
521 | ||
522 | s=chains[chain]; | |
523 | while(s && s->unit_minor <= unit) | |
524 | { | |
525 | if(s->unit_minor==unit) | |
526 | return s; | |
527 | s=s->next; | |
528 | } | |
529 | return NULL; | |
530 | } | |
531 | ||
a39c4ad1 | 532 | static int soundcore_open(struct inode *inode, struct file *file) |
1da177e4 LT |
533 | { |
534 | int chain; | |
535 | int unit = iminor(inode); | |
536 | struct sound_unit *s; | |
99ac48f5 | 537 | const struct file_operations *new_fops = NULL; |
1da177e4 LT |
538 | |
539 | chain=unit&0x0F; | |
540 | if(chain==4 || chain==5) /* dsp/audio/dsp16 */ | |
541 | { | |
542 | unit&=0xF0; | |
543 | unit|=3; | |
544 | chain=3; | |
545 | } | |
546 | ||
547 | spin_lock(&sound_loader_lock); | |
548 | s = __look_for_unit(chain, unit); | |
549 | if (s) | |
550 | new_fops = fops_get(s->unit_fops); | |
93fe4483 | 551 | if (preclaim_oss && !new_fops) { |
1da177e4 | 552 | spin_unlock(&sound_loader_lock); |
0a848680 | 553 | |
1da177e4 LT |
554 | /* |
555 | * Please, don't change this order or code. | |
556 | * For ALSA slot means soundcard and OSS emulation code | |
557 | * comes as add-on modules which aren't depend on | |
558 | * ALSA toplevel modules for soundcards, thus we need | |
559 | * load them at first. [Jaroslav Kysela <perex@jcu.cz>] | |
560 | */ | |
561 | request_module("sound-slot-%i", unit>>4); | |
562 | request_module("sound-service-%i-%i", unit>>4, chain); | |
0a848680 TH |
563 | |
564 | /* | |
565 | * sound-slot/service-* module aliases are scheduled | |
566 | * for removal in favor of the standard char-major-* | |
567 | * module aliases. For the time being, generate both | |
568 | * the legacy and standard module aliases to ease | |
569 | * transition. | |
570 | */ | |
571 | if (request_module("char-major-%d-%d", SOUND_MAJOR, unit) > 0) | |
572 | request_module("char-major-%d", SOUND_MAJOR); | |
573 | ||
1da177e4 LT |
574 | spin_lock(&sound_loader_lock); |
575 | s = __look_for_unit(chain, unit); | |
576 | if (s) | |
577 | new_fops = fops_get(s->unit_fops); | |
578 | } | |
e84f9e57 | 579 | spin_unlock(&sound_loader_lock); |
171d9f7d | 580 | |
e52b78f8 MT |
581 | if (!new_fops) |
582 | return -ENODEV; | |
171d9f7d | 583 | |
e52b78f8 MT |
584 | /* |
585 | * We rely upon the fact that we can't be unloaded while the | |
586 | * subdriver is there. | |
587 | */ | |
588 | replace_fops(file, new_fops); | |
589 | ||
590 | if (!file->f_op->open) | |
591 | return -ENODEV; | |
592 | ||
593 | return file->f_op->open(inode, file); | |
1da177e4 LT |
594 | } |
595 | ||
1da177e4 LT |
596 | MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); |
597 | ||
de30d36b | 598 | static void cleanup_oss_soundcore(void) |
1da177e4 LT |
599 | { |
600 | /* We have nothing to really do here - we know the lists must be | |
601 | empty */ | |
602 | unregister_chrdev(SOUND_MAJOR, "sound"); | |
1da177e4 LT |
603 | } |
604 | ||
d886e87c | 605 | static int __init init_oss_soundcore(void) |
1da177e4 | 606 | { |
93fe4483 | 607 | if (preclaim_oss && |
cb68429d | 608 | register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops) < 0) { |
1da177e4 LT |
609 | printk(KERN_ERR "soundcore: sound device already in use.\n"); |
610 | return -EBUSY; | |
611 | } | |
1da177e4 LT |
612 | |
613 | return 0; | |
614 | } | |
615 | ||
d886e87c | 616 | #endif /* CONFIG_SOUND_OSS_CORE */ |