Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
d886e87c TH |
2 | * Sound core. This file is composed of two parts. sound_class |
3 | * which is common to both OSS and ALSA and OSS sound core which | |
4 | * is used OSS or emulation of it. | |
5 | */ | |
6 | ||
7 | /* | |
8 | * First, the common part. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/err.h> | |
3d1ee379 | 13 | #include <sound/core.h> |
d886e87c TH |
14 | |
15 | #ifdef CONFIG_SOUND_OSS_CORE | |
16 | static int __init init_oss_soundcore(void); | |
de30d36b | 17 | static void cleanup_oss_soundcore(void); |
d886e87c TH |
18 | #else |
19 | static inline int init_oss_soundcore(void) { return 0; } | |
20 | static inline void cleanup_oss_soundcore(void) { } | |
21 | #endif | |
22 | ||
23 | struct class *sound_class; | |
24 | EXPORT_SYMBOL(sound_class); | |
25 | ||
26 | MODULE_DESCRIPTION("Core sound module"); | |
27 | MODULE_AUTHOR("Alan Cox"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
30 | static int __init init_soundcore(void) | |
31 | { | |
32 | int rc; | |
33 | ||
34 | rc = init_oss_soundcore(); | |
35 | if (rc) | |
36 | return rc; | |
37 | ||
38 | sound_class = class_create(THIS_MODULE, "sound"); | |
39 | if (IS_ERR(sound_class)) { | |
40 | cleanup_oss_soundcore(); | |
41 | return PTR_ERR(sound_class); | |
42 | } | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
47 | static void __exit cleanup_soundcore(void) | |
48 | { | |
49 | cleanup_oss_soundcore(); | |
50 | class_destroy(sound_class); | |
51 | } | |
52 | ||
53 | module_init(init_soundcore); | |
54 | module_exit(cleanup_soundcore); | |
55 | ||
56 | ||
57 | #ifdef CONFIG_SOUND_OSS_CORE | |
58 | /* | |
59 | * OSS sound core handling. Breaks out sound functions to submodules | |
1da177e4 | 60 | * |
2f1e593d | 61 | * Author: Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
62 | * |
63 | * Fixes: | |
64 | * | |
65 | * | |
66 | * This program is free software; you can redistribute it and/or | |
67 | * modify it under the terms of the GNU General Public License | |
68 | * as published by the Free Software Foundation; either version | |
69 | * 2 of the License, or (at your option) any later version. | |
70 | * | |
71 | * -------------------- | |
72 | * | |
73 | * Top level handler for the sound subsystem. Various devices can | |
74 | * plug into this. The fact they don't all go via OSS doesn't mean | |
75 | * they don't have to implement the OSS API. There is a lot of logic | |
76 | * to keeping much of the OSS weight out of the code in a compatibility | |
77 | * module, but it's up to the driver to rember to load it... | |
78 | * | |
79 | * The code provides a set of functions for registration of devices | |
80 | * by type. This is done rather than providing a single call so that | |
81 | * we can hide any future changes in the internals (eg when we go to | |
82 | * 32bit dev_t) from the modules and their interface. | |
83 | * | |
84 | * Secondly we need to allocate the dsp, dsp16 and audio devices as | |
85 | * one. Thus we misuse the chains a bit to simplify this. | |
86 | * | |
87 | * Thirdly to make it more fun and for 2.3.x and above we do all | |
88 | * of this using fine grained locking. | |
89 | * | |
90 | * FIXME: we have to resolve modules and fine grained load/unload | |
91 | * locking at some point in 2.3.x. | |
92 | */ | |
93 | ||
1da177e4 LT |
94 | #include <linux/init.h> |
95 | #include <linux/slab.h> | |
78a3c3d7 | 96 | #include <linux/smp_lock.h> |
1da177e4 LT |
97 | #include <linux/types.h> |
98 | #include <linux/kernel.h> | |
1da177e4 LT |
99 | #include <linux/sound.h> |
100 | #include <linux/major.h> | |
101 | #include <linux/kmod.h> | |
1da177e4 LT |
102 | |
103 | #define SOUND_STEP 16 | |
104 | ||
1da177e4 LT |
105 | struct sound_unit |
106 | { | |
107 | int unit_minor; | |
99ac48f5 | 108 | const struct file_operations *unit_fops; |
1da177e4 LT |
109 | struct sound_unit *next; |
110 | char name[32]; | |
111 | }; | |
112 | ||
113 | #ifdef CONFIG_SOUND_MSNDCLAS | |
114 | extern int msnd_classic_init(void); | |
115 | #endif | |
116 | #ifdef CONFIG_SOUND_MSNDPIN | |
117 | extern int msnd_pinnacle_init(void); | |
118 | #endif | |
119 | ||
1da177e4 LT |
120 | /* |
121 | * Low level list operator. Scan the ordered list, find a hole and | |
122 | * join into it. Called with the lock asserted | |
123 | */ | |
124 | ||
99ac48f5 | 125 | 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 |
126 | { |
127 | int n=low; | |
128 | ||
129 | if (index < 0) { /* first free */ | |
130 | ||
131 | while (*list && (*list)->unit_minor<n) | |
132 | list=&((*list)->next); | |
133 | ||
134 | while(n<top) | |
135 | { | |
136 | /* Found a hole ? */ | |
137 | if(*list==NULL || (*list)->unit_minor>n) | |
138 | break; | |
139 | list=&((*list)->next); | |
140 | n+=SOUND_STEP; | |
141 | } | |
142 | ||
143 | if(n>=top) | |
144 | return -ENOENT; | |
145 | } else { | |
146 | n = low+(index*16); | |
147 | while (*list) { | |
148 | if ((*list)->unit_minor==n) | |
149 | return -EBUSY; | |
150 | if ((*list)->unit_minor>n) | |
151 | break; | |
152 | list=&((*list)->next); | |
153 | } | |
154 | } | |
155 | ||
156 | /* | |
157 | * Fill it in | |
158 | */ | |
159 | ||
160 | s->unit_minor=n; | |
161 | s->unit_fops=fops; | |
162 | ||
163 | /* | |
164 | * Link it | |
165 | */ | |
166 | ||
167 | s->next=*list; | |
168 | *list=s; | |
169 | ||
170 | ||
171 | return n; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Remove a node from the chain. Called with the lock asserted | |
176 | */ | |
177 | ||
178 | static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit) | |
179 | { | |
180 | while(*list) | |
181 | { | |
182 | struct sound_unit *p=*list; | |
183 | if(p->unit_minor==unit) | |
184 | { | |
185 | *list=p->next; | |
186 | return p; | |
187 | } | |
188 | list=&(p->next); | |
189 | } | |
190 | printk(KERN_ERR "Sound device %d went missing!\n", unit); | |
191 | return NULL; | |
192 | } | |
193 | ||
194 | /* | |
195 | * This lock guards the sound loader list. | |
196 | */ | |
197 | ||
198 | static DEFINE_SPINLOCK(sound_loader_lock); | |
199 | ||
200 | /* | |
201 | * Allocate the controlling structure and add it to the sound driver | |
202 | * list. Acquires locks as needed | |
203 | */ | |
204 | ||
99ac48f5 | 205 | 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 |
206 | { |
207 | struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
208 | int r; | |
209 | ||
210 | if (!s) | |
211 | return -ENOMEM; | |
212 | ||
213 | spin_lock(&sound_loader_lock); | |
214 | r = __sound_insert_unit(s, list, fops, index, low, top); | |
215 | spin_unlock(&sound_loader_lock); | |
216 | ||
217 | if (r < 0) | |
218 | goto fail; | |
219 | else if (r < SOUND_STEP) | |
220 | sprintf(s->name, "sound/%s", name); | |
221 | else | |
222 | sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP); | |
223 | ||
abe9ab8f GKH |
224 | device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), |
225 | NULL, s->name+6); | |
1da177e4 LT |
226 | return r; |
227 | ||
228 | fail: | |
229 | kfree(s); | |
230 | return r; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Remove a unit. Acquires locks as needed. The drivers MUST have | |
235 | * completed the removal before their file operations become | |
236 | * invalid. | |
237 | */ | |
238 | ||
239 | static void sound_remove_unit(struct sound_unit **list, int unit) | |
240 | { | |
241 | struct sound_unit *p; | |
242 | ||
243 | spin_lock(&sound_loader_lock); | |
244 | p = __sound_remove_unit(list, unit); | |
245 | spin_unlock(&sound_loader_lock); | |
246 | if (p) { | |
d80f19fa | 247 | device_destroy(sound_class, MKDEV(SOUND_MAJOR, p->unit_minor)); |
1da177e4 LT |
248 | kfree(p); |
249 | } | |
250 | } | |
251 | ||
252 | /* | |
253 | * Allocations | |
254 | * | |
255 | * 0 *16 Mixers | |
256 | * 1 *8 Sequencers | |
257 | * 2 *16 Midi | |
258 | * 3 *16 DSP | |
259 | * 4 *16 SunDSP | |
260 | * 5 *16 DSP16 | |
261 | * 6 -- sndstat (obsolete) | |
262 | * 7 *16 unused | |
263 | * 8 -- alternate sequencer (see above) | |
264 | * 9 *16 raw synthesizer access | |
265 | * 10 *16 unused | |
266 | * 11 *16 unused | |
267 | * 12 *16 unused | |
268 | * 13 *16 unused | |
269 | * 14 *16 unused | |
270 | * 15 *16 unused | |
271 | */ | |
272 | ||
273 | static struct sound_unit *chains[SOUND_STEP]; | |
274 | ||
275 | /** | |
d568121c | 276 | * register_sound_special_device - register a special sound node |
1da177e4 LT |
277 | * @fops: File operations for the driver |
278 | * @unit: Unit number to allocate | |
d568121c | 279 | * @dev: device pointer |
1da177e4 LT |
280 | * |
281 | * Allocate a special sound device by minor number from the sound | |
282 | * subsystem. The allocated number is returned on succes. On failure | |
283 | * a negative error code is returned. | |
284 | */ | |
285 | ||
99ac48f5 | 286 | int register_sound_special_device(const struct file_operations *fops, int unit, |
d568121c | 287 | struct device *dev) |
1da177e4 LT |
288 | { |
289 | const int chain = unit % SOUND_STEP; | |
290 | int max_unit = 128 + chain; | |
291 | const char *name; | |
292 | char _name[16]; | |
293 | ||
294 | switch (chain) { | |
295 | case 0: | |
296 | name = "mixer"; | |
297 | break; | |
298 | case 1: | |
299 | name = "sequencer"; | |
300 | if (unit >= SOUND_STEP) | |
301 | goto __unknown; | |
302 | max_unit = unit + 1; | |
303 | break; | |
304 | case 2: | |
305 | name = "midi"; | |
306 | break; | |
307 | case 3: | |
308 | name = "dsp"; | |
309 | break; | |
310 | case 4: | |
311 | name = "audio"; | |
312 | break; | |
313 | case 8: | |
314 | name = "sequencer2"; | |
315 | if (unit >= SOUND_STEP) | |
316 | goto __unknown; | |
317 | max_unit = unit + 1; | |
318 | break; | |
319 | case 9: | |
320 | name = "dmmidi"; | |
321 | break; | |
322 | case 10: | |
323 | name = "dmfm"; | |
324 | break; | |
325 | case 12: | |
326 | name = "adsp"; | |
327 | break; | |
328 | case 13: | |
329 | name = "amidi"; | |
330 | break; | |
331 | case 14: | |
332 | name = "admmidi"; | |
333 | break; | |
334 | default: | |
335 | { | |
336 | __unknown: | |
337 | sprintf(_name, "unknown%d", chain); | |
338 | if (unit >= SOUND_STEP) | |
339 | strcat(_name, "-"); | |
340 | name = _name; | |
341 | } | |
342 | break; | |
343 | } | |
344 | return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit, | |
d568121c | 345 | name, S_IRUSR | S_IWUSR, dev); |
1da177e4 LT |
346 | } |
347 | ||
d568121c TI |
348 | EXPORT_SYMBOL(register_sound_special_device); |
349 | ||
99ac48f5 | 350 | int register_sound_special(const struct file_operations *fops, int unit) |
d568121c TI |
351 | { |
352 | return register_sound_special_device(fops, unit, NULL); | |
353 | } | |
354 | ||
1da177e4 LT |
355 | EXPORT_SYMBOL(register_sound_special); |
356 | ||
357 | /** | |
358 | * register_sound_mixer - register a mixer device | |
359 | * @fops: File operations for the driver | |
360 | * @dev: Unit number to allocate | |
361 | * | |
362 | * Allocate a mixer device. Unit is the number of the mixer requested. | |
363 | * Pass -1 to request the next free mixer unit. On success the allocated | |
364 | * number is returned, on failure a negative error code is returned. | |
365 | */ | |
366 | ||
99ac48f5 | 367 | int register_sound_mixer(const struct file_operations *fops, int dev) |
1da177e4 LT |
368 | { |
369 | return sound_insert_unit(&chains[0], fops, dev, 0, 128, | |
d568121c | 370 | "mixer", S_IRUSR | S_IWUSR, NULL); |
1da177e4 LT |
371 | } |
372 | ||
373 | EXPORT_SYMBOL(register_sound_mixer); | |
374 | ||
375 | /** | |
376 | * register_sound_midi - register a midi device | |
377 | * @fops: File operations for the driver | |
378 | * @dev: Unit number to allocate | |
379 | * | |
380 | * Allocate a midi device. Unit is the number of the midi device requested. | |
381 | * Pass -1 to request the next free midi unit. On success the allocated | |
382 | * number is returned, on failure a negative error code is returned. | |
383 | */ | |
384 | ||
99ac48f5 | 385 | int register_sound_midi(const struct file_operations *fops, int dev) |
1da177e4 LT |
386 | { |
387 | return sound_insert_unit(&chains[2], fops, dev, 2, 130, | |
d568121c | 388 | "midi", S_IRUSR | S_IWUSR, NULL); |
1da177e4 LT |
389 | } |
390 | ||
391 | EXPORT_SYMBOL(register_sound_midi); | |
392 | ||
393 | /* | |
394 | * DSP's are registered as a triple. Register only one and cheat | |
395 | * in open - see below. | |
396 | */ | |
397 | ||
398 | /** | |
399 | * register_sound_dsp - register a DSP device | |
400 | * @fops: File operations for the driver | |
401 | * @dev: Unit number to allocate | |
402 | * | |
403 | * Allocate a DSP device. Unit is the number of the DSP requested. | |
404 | * Pass -1 to request the next free DSP unit. On success the allocated | |
405 | * number is returned, on failure a negative error code is returned. | |
406 | * | |
407 | * This function allocates both the audio and dsp device entries together | |
408 | * and will always allocate them as a matching pair - eg dsp3/audio3 | |
409 | */ | |
410 | ||
99ac48f5 | 411 | int register_sound_dsp(const struct file_operations *fops, int dev) |
1da177e4 LT |
412 | { |
413 | return sound_insert_unit(&chains[3], fops, dev, 3, 131, | |
d568121c | 414 | "dsp", S_IWUSR | S_IRUSR, NULL); |
1da177e4 LT |
415 | } |
416 | ||
417 | EXPORT_SYMBOL(register_sound_dsp); | |
418 | ||
1da177e4 LT |
419 | /** |
420 | * unregister_sound_special - unregister a special sound device | |
421 | * @unit: unit number to allocate | |
422 | * | |
423 | * Release a sound device that was allocated with | |
424 | * register_sound_special(). The unit passed is the return value from | |
425 | * the register function. | |
426 | */ | |
427 | ||
428 | ||
429 | void unregister_sound_special(int unit) | |
430 | { | |
431 | sound_remove_unit(&chains[unit % SOUND_STEP], unit); | |
432 | } | |
433 | ||
434 | EXPORT_SYMBOL(unregister_sound_special); | |
435 | ||
436 | /** | |
437 | * unregister_sound_mixer - unregister a mixer | |
438 | * @unit: unit number to allocate | |
439 | * | |
440 | * Release a sound device that was allocated with register_sound_mixer(). | |
441 | * The unit passed is the return value from the register function. | |
442 | */ | |
443 | ||
444 | void unregister_sound_mixer(int unit) | |
445 | { | |
446 | sound_remove_unit(&chains[0], unit); | |
447 | } | |
448 | ||
449 | EXPORT_SYMBOL(unregister_sound_mixer); | |
450 | ||
451 | /** | |
452 | * unregister_sound_midi - unregister a midi device | |
453 | * @unit: unit number to allocate | |
454 | * | |
455 | * Release a sound device that was allocated with register_sound_midi(). | |
456 | * The unit passed is the return value from the register function. | |
457 | */ | |
458 | ||
459 | void unregister_sound_midi(int unit) | |
460 | { | |
a39c4ad1 | 461 | sound_remove_unit(&chains[2], unit); |
1da177e4 LT |
462 | } |
463 | ||
464 | EXPORT_SYMBOL(unregister_sound_midi); | |
465 | ||
466 | /** | |
467 | * unregister_sound_dsp - unregister a DSP device | |
468 | * @unit: unit number to allocate | |
469 | * | |
470 | * Release a sound device that was allocated with register_sound_dsp(). | |
471 | * The unit passed is the return value from the register function. | |
472 | * | |
473 | * Both of the allocated units are released together automatically. | |
474 | */ | |
475 | ||
476 | void unregister_sound_dsp(int unit) | |
477 | { | |
a39c4ad1 | 478 | sound_remove_unit(&chains[3], unit); |
1da177e4 LT |
479 | } |
480 | ||
481 | ||
482 | EXPORT_SYMBOL(unregister_sound_dsp); | |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Now our file operations | |
486 | */ | |
487 | ||
488 | static int soundcore_open(struct inode *, struct file *); | |
489 | ||
9c2e08c5 | 490 | static const struct file_operations soundcore_fops= |
1da177e4 LT |
491 | { |
492 | /* We must have an owner or the module locking fails */ | |
493 | .owner = THIS_MODULE, | |
494 | .open = soundcore_open, | |
495 | }; | |
496 | ||
497 | static struct sound_unit *__look_for_unit(int chain, int unit) | |
498 | { | |
499 | struct sound_unit *s; | |
500 | ||
501 | s=chains[chain]; | |
502 | while(s && s->unit_minor <= unit) | |
503 | { | |
504 | if(s->unit_minor==unit) | |
505 | return s; | |
506 | s=s->next; | |
507 | } | |
508 | return NULL; | |
509 | } | |
510 | ||
a39c4ad1 | 511 | static int soundcore_open(struct inode *inode, struct file *file) |
1da177e4 LT |
512 | { |
513 | int chain; | |
514 | int unit = iminor(inode); | |
515 | struct sound_unit *s; | |
99ac48f5 | 516 | const struct file_operations *new_fops = NULL; |
1da177e4 | 517 | |
78a3c3d7 JC |
518 | lock_kernel (); |
519 | ||
1da177e4 LT |
520 | chain=unit&0x0F; |
521 | if(chain==4 || chain==5) /* dsp/audio/dsp16 */ | |
522 | { | |
523 | unit&=0xF0; | |
524 | unit|=3; | |
525 | chain=3; | |
526 | } | |
527 | ||
528 | spin_lock(&sound_loader_lock); | |
529 | s = __look_for_unit(chain, unit); | |
530 | if (s) | |
531 | new_fops = fops_get(s->unit_fops); | |
532 | if (!new_fops) { | |
533 | spin_unlock(&sound_loader_lock); | |
534 | /* | |
535 | * Please, don't change this order or code. | |
536 | * For ALSA slot means soundcard and OSS emulation code | |
537 | * comes as add-on modules which aren't depend on | |
538 | * ALSA toplevel modules for soundcards, thus we need | |
539 | * load them at first. [Jaroslav Kysela <perex@jcu.cz>] | |
540 | */ | |
541 | request_module("sound-slot-%i", unit>>4); | |
542 | request_module("sound-service-%i-%i", unit>>4, chain); | |
543 | spin_lock(&sound_loader_lock); | |
544 | s = __look_for_unit(chain, unit); | |
545 | if (s) | |
546 | new_fops = fops_get(s->unit_fops); | |
547 | } | |
548 | if (new_fops) { | |
549 | /* | |
550 | * We rely upon the fact that we can't be unloaded while the | |
551 | * subdriver is there, so if ->open() is successful we can | |
552 | * safely drop the reference counter and if it is not we can | |
553 | * revert to old ->f_op. Ugly, indeed, but that's the cost of | |
554 | * switching ->f_op in the first place. | |
555 | */ | |
556 | int err = 0; | |
99ac48f5 | 557 | const struct file_operations *old_fops = file->f_op; |
1da177e4 LT |
558 | file->f_op = new_fops; |
559 | spin_unlock(&sound_loader_lock); | |
560 | if(file->f_op->open) | |
561 | err = file->f_op->open(inode,file); | |
562 | if (err) { | |
563 | fops_put(file->f_op); | |
564 | file->f_op = fops_get(old_fops); | |
565 | } | |
566 | fops_put(old_fops); | |
78a3c3d7 | 567 | unlock_kernel(); |
1da177e4 LT |
568 | return err; |
569 | } | |
570 | spin_unlock(&sound_loader_lock); | |
78a3c3d7 | 571 | unlock_kernel(); |
1da177e4 LT |
572 | return -ENODEV; |
573 | } | |
574 | ||
1da177e4 LT |
575 | MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); |
576 | ||
de30d36b | 577 | static void cleanup_oss_soundcore(void) |
1da177e4 LT |
578 | { |
579 | /* We have nothing to really do here - we know the lists must be | |
580 | empty */ | |
581 | unregister_chrdev(SOUND_MAJOR, "sound"); | |
1da177e4 LT |
582 | } |
583 | ||
d886e87c | 584 | static int __init init_oss_soundcore(void) |
1da177e4 LT |
585 | { |
586 | if (register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops)==-1) { | |
587 | printk(KERN_ERR "soundcore: sound device already in use.\n"); | |
588 | return -EBUSY; | |
589 | } | |
1da177e4 LT |
590 | |
591 | return 0; | |
592 | } | |
593 | ||
d886e87c | 594 | #endif /* CONFIG_SOUND_OSS_CORE */ |