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 | ||
7a9d56f6 KS |
30 | static char *sound_nodename(struct device *dev) |
31 | { | |
32 | return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev)); | |
33 | } | |
34 | ||
d886e87c TH |
35 | static int __init init_soundcore(void) |
36 | { | |
37 | int rc; | |
38 | ||
39 | rc = init_oss_soundcore(); | |
40 | if (rc) | |
41 | return rc; | |
42 | ||
43 | sound_class = class_create(THIS_MODULE, "sound"); | |
44 | if (IS_ERR(sound_class)) { | |
45 | cleanup_oss_soundcore(); | |
46 | return PTR_ERR(sound_class); | |
47 | } | |
48 | ||
7a9d56f6 KS |
49 | sound_class->nodename = sound_nodename; |
50 | ||
d886e87c TH |
51 | return 0; |
52 | } | |
53 | ||
54 | static void __exit cleanup_soundcore(void) | |
55 | { | |
56 | cleanup_oss_soundcore(); | |
57 | class_destroy(sound_class); | |
58 | } | |
59 | ||
60 | module_init(init_soundcore); | |
61 | module_exit(cleanup_soundcore); | |
62 | ||
63 | ||
64 | #ifdef CONFIG_SOUND_OSS_CORE | |
65 | /* | |
66 | * OSS sound core handling. Breaks out sound functions to submodules | |
1da177e4 | 67 | * |
2f1e593d | 68 | * Author: Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
69 | * |
70 | * Fixes: | |
71 | * | |
72 | * | |
73 | * This program is free software; you can redistribute it and/or | |
74 | * modify it under the terms of the GNU General Public License | |
75 | * as published by the Free Software Foundation; either version | |
76 | * 2 of the License, or (at your option) any later version. | |
77 | * | |
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> | |
78a3c3d7 | 103 | #include <linux/smp_lock.h> |
1da177e4 LT |
104 | #include <linux/types.h> |
105 | #include <linux/kernel.h> | |
1da177e4 LT |
106 | #include <linux/sound.h> |
107 | #include <linux/major.h> | |
108 | #include <linux/kmod.h> | |
1da177e4 LT |
109 | |
110 | #define SOUND_STEP 16 | |
111 | ||
1da177e4 LT |
112 | struct sound_unit |
113 | { | |
114 | int unit_minor; | |
99ac48f5 | 115 | const struct file_operations *unit_fops; |
1da177e4 LT |
116 | struct sound_unit *next; |
117 | char name[32]; | |
118 | }; | |
119 | ||
120 | #ifdef CONFIG_SOUND_MSNDCLAS | |
121 | extern int msnd_classic_init(void); | |
122 | #endif | |
123 | #ifdef CONFIG_SOUND_MSNDPIN | |
124 | extern int msnd_pinnacle_init(void); | |
125 | #endif | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * Low level list operator. Scan the ordered list, find a hole and | |
129 | * join into it. Called with the lock asserted | |
130 | */ | |
131 | ||
99ac48f5 | 132 | 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 |
133 | { |
134 | int n=low; | |
135 | ||
136 | if (index < 0) { /* first free */ | |
137 | ||
138 | while (*list && (*list)->unit_minor<n) | |
139 | list=&((*list)->next); | |
140 | ||
141 | while(n<top) | |
142 | { | |
143 | /* Found a hole ? */ | |
144 | if(*list==NULL || (*list)->unit_minor>n) | |
145 | break; | |
146 | list=&((*list)->next); | |
147 | n+=SOUND_STEP; | |
148 | } | |
149 | ||
150 | if(n>=top) | |
151 | return -ENOENT; | |
152 | } else { | |
153 | n = low+(index*16); | |
154 | while (*list) { | |
155 | if ((*list)->unit_minor==n) | |
156 | return -EBUSY; | |
157 | if ((*list)->unit_minor>n) | |
158 | break; | |
159 | list=&((*list)->next); | |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
164 | * Fill it in | |
165 | */ | |
166 | ||
167 | s->unit_minor=n; | |
168 | s->unit_fops=fops; | |
169 | ||
170 | /* | |
171 | * Link it | |
172 | */ | |
173 | ||
174 | s->next=*list; | |
175 | *list=s; | |
176 | ||
177 | ||
178 | return n; | |
179 | } | |
180 | ||
181 | /* | |
182 | * Remove a node from the chain. Called with the lock asserted | |
183 | */ | |
184 | ||
185 | static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit) | |
186 | { | |
187 | while(*list) | |
188 | { | |
189 | struct sound_unit *p=*list; | |
190 | if(p->unit_minor==unit) | |
191 | { | |
192 | *list=p->next; | |
193 | return p; | |
194 | } | |
195 | list=&(p->next); | |
196 | } | |
197 | printk(KERN_ERR "Sound device %d went missing!\n", unit); | |
198 | return NULL; | |
199 | } | |
200 | ||
201 | /* | |
202 | * This lock guards the sound loader list. | |
203 | */ | |
204 | ||
205 | static DEFINE_SPINLOCK(sound_loader_lock); | |
206 | ||
207 | /* | |
208 | * Allocate the controlling structure and add it to the sound driver | |
209 | * list. Acquires locks as needed | |
210 | */ | |
211 | ||
99ac48f5 | 212 | 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 |
213 | { |
214 | struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
215 | int r; | |
216 | ||
217 | if (!s) | |
218 | return -ENOMEM; | |
219 | ||
220 | spin_lock(&sound_loader_lock); | |
221 | r = __sound_insert_unit(s, list, fops, index, low, top); | |
222 | spin_unlock(&sound_loader_lock); | |
223 | ||
224 | if (r < 0) | |
225 | goto fail; | |
226 | else if (r < SOUND_STEP) | |
227 | sprintf(s->name, "sound/%s", name); | |
228 | else | |
229 | sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP); | |
230 | ||
abe9ab8f GKH |
231 | device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), |
232 | NULL, s->name+6); | |
1da177e4 LT |
233 | return r; |
234 | ||
235 | fail: | |
236 | kfree(s); | |
237 | return r; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Remove a unit. Acquires locks as needed. The drivers MUST have | |
242 | * completed the removal before their file operations become | |
243 | * invalid. | |
244 | */ | |
245 | ||
246 | static void sound_remove_unit(struct sound_unit **list, int unit) | |
247 | { | |
248 | struct sound_unit *p; | |
249 | ||
250 | spin_lock(&sound_loader_lock); | |
251 | p = __sound_remove_unit(list, unit); | |
252 | spin_unlock(&sound_loader_lock); | |
253 | if (p) { | |
d80f19fa | 254 | device_destroy(sound_class, MKDEV(SOUND_MAJOR, p->unit_minor)); |
1da177e4 LT |
255 | kfree(p); |
256 | } | |
257 | } | |
258 | ||
259 | /* | |
260 | * Allocations | |
261 | * | |
262 | * 0 *16 Mixers | |
263 | * 1 *8 Sequencers | |
264 | * 2 *16 Midi | |
265 | * 3 *16 DSP | |
266 | * 4 *16 SunDSP | |
267 | * 5 *16 DSP16 | |
268 | * 6 -- sndstat (obsolete) | |
269 | * 7 *16 unused | |
270 | * 8 -- alternate sequencer (see above) | |
271 | * 9 *16 raw synthesizer access | |
272 | * 10 *16 unused | |
273 | * 11 *16 unused | |
274 | * 12 *16 unused | |
275 | * 13 *16 unused | |
276 | * 14 *16 unused | |
277 | * 15 *16 unused | |
278 | */ | |
279 | ||
280 | static struct sound_unit *chains[SOUND_STEP]; | |
281 | ||
282 | /** | |
d568121c | 283 | * register_sound_special_device - register a special sound node |
1da177e4 LT |
284 | * @fops: File operations for the driver |
285 | * @unit: Unit number to allocate | |
d568121c | 286 | * @dev: device pointer |
1da177e4 LT |
287 | * |
288 | * Allocate a special sound device by minor number from the sound | |
289 | * subsystem. The allocated number is returned on succes. On failure | |
290 | * a negative error code is returned. | |
291 | */ | |
292 | ||
99ac48f5 | 293 | int register_sound_special_device(const struct file_operations *fops, int unit, |
d568121c | 294 | struct device *dev) |
1da177e4 LT |
295 | { |
296 | const int chain = unit % SOUND_STEP; | |
297 | int max_unit = 128 + chain; | |
298 | const char *name; | |
299 | char _name[16]; | |
300 | ||
301 | switch (chain) { | |
302 | case 0: | |
303 | name = "mixer"; | |
304 | break; | |
305 | case 1: | |
306 | name = "sequencer"; | |
307 | if (unit >= SOUND_STEP) | |
308 | goto __unknown; | |
309 | max_unit = unit + 1; | |
310 | break; | |
311 | case 2: | |
312 | name = "midi"; | |
313 | break; | |
314 | case 3: | |
315 | name = "dsp"; | |
316 | break; | |
317 | case 4: | |
318 | name = "audio"; | |
319 | break; | |
320 | case 8: | |
321 | name = "sequencer2"; | |
322 | if (unit >= SOUND_STEP) | |
323 | goto __unknown; | |
324 | max_unit = unit + 1; | |
325 | break; | |
326 | case 9: | |
327 | name = "dmmidi"; | |
328 | break; | |
329 | case 10: | |
330 | name = "dmfm"; | |
331 | break; | |
332 | case 12: | |
333 | name = "adsp"; | |
334 | break; | |
335 | case 13: | |
336 | name = "amidi"; | |
337 | break; | |
338 | case 14: | |
339 | name = "admmidi"; | |
340 | break; | |
341 | default: | |
342 | { | |
343 | __unknown: | |
344 | sprintf(_name, "unknown%d", chain); | |
345 | if (unit >= SOUND_STEP) | |
346 | strcat(_name, "-"); | |
347 | name = _name; | |
348 | } | |
349 | break; | |
350 | } | |
351 | return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit, | |
d568121c | 352 | name, S_IRUSR | S_IWUSR, dev); |
1da177e4 LT |
353 | } |
354 | ||
d568121c TI |
355 | EXPORT_SYMBOL(register_sound_special_device); |
356 | ||
99ac48f5 | 357 | int register_sound_special(const struct file_operations *fops, int unit) |
d568121c TI |
358 | { |
359 | return register_sound_special_device(fops, unit, NULL); | |
360 | } | |
361 | ||
1da177e4 LT |
362 | EXPORT_SYMBOL(register_sound_special); |
363 | ||
364 | /** | |
365 | * register_sound_mixer - register a mixer device | |
366 | * @fops: File operations for the driver | |
367 | * @dev: Unit number to allocate | |
368 | * | |
369 | * Allocate a mixer device. Unit is the number of the mixer requested. | |
370 | * Pass -1 to request the next free mixer unit. On success the allocated | |
371 | * number is returned, on failure a negative error code is returned. | |
372 | */ | |
373 | ||
99ac48f5 | 374 | int register_sound_mixer(const struct file_operations *fops, int dev) |
1da177e4 LT |
375 | { |
376 | return sound_insert_unit(&chains[0], fops, dev, 0, 128, | |
d568121c | 377 | "mixer", S_IRUSR | S_IWUSR, NULL); |
1da177e4 LT |
378 | } |
379 | ||
380 | EXPORT_SYMBOL(register_sound_mixer); | |
381 | ||
382 | /** | |
383 | * register_sound_midi - register a midi device | |
384 | * @fops: File operations for the driver | |
385 | * @dev: Unit number to allocate | |
386 | * | |
387 | * Allocate a midi device. Unit is the number of the midi device requested. | |
388 | * Pass -1 to request the next free midi unit. On success the allocated | |
389 | * number is returned, on failure a negative error code is returned. | |
390 | */ | |
391 | ||
99ac48f5 | 392 | int register_sound_midi(const struct file_operations *fops, int dev) |
1da177e4 LT |
393 | { |
394 | return sound_insert_unit(&chains[2], fops, dev, 2, 130, | |
d568121c | 395 | "midi", S_IRUSR | S_IWUSR, NULL); |
1da177e4 LT |
396 | } |
397 | ||
398 | EXPORT_SYMBOL(register_sound_midi); | |
399 | ||
400 | /* | |
401 | * DSP's are registered as a triple. Register only one and cheat | |
402 | * in open - see below. | |
403 | */ | |
404 | ||
405 | /** | |
406 | * register_sound_dsp - register a DSP device | |
407 | * @fops: File operations for the driver | |
408 | * @dev: Unit number to allocate | |
409 | * | |
410 | * Allocate a DSP device. Unit is the number of the DSP requested. | |
411 | * Pass -1 to request the next free DSP unit. On success the allocated | |
412 | * number is returned, on failure a negative error code is returned. | |
413 | * | |
414 | * This function allocates both the audio and dsp device entries together | |
415 | * and will always allocate them as a matching pair - eg dsp3/audio3 | |
416 | */ | |
417 | ||
99ac48f5 | 418 | int register_sound_dsp(const struct file_operations *fops, int dev) |
1da177e4 LT |
419 | { |
420 | return sound_insert_unit(&chains[3], fops, dev, 3, 131, | |
d568121c | 421 | "dsp", S_IWUSR | S_IRUSR, NULL); |
1da177e4 LT |
422 | } |
423 | ||
424 | EXPORT_SYMBOL(register_sound_dsp); | |
425 | ||
1da177e4 LT |
426 | /** |
427 | * unregister_sound_special - unregister a special sound device | |
428 | * @unit: unit number to allocate | |
429 | * | |
430 | * Release a sound device that was allocated with | |
431 | * register_sound_special(). The unit passed is the return value from | |
432 | * the register function. | |
433 | */ | |
434 | ||
435 | ||
436 | void unregister_sound_special(int unit) | |
437 | { | |
438 | sound_remove_unit(&chains[unit % SOUND_STEP], unit); | |
439 | } | |
440 | ||
441 | EXPORT_SYMBOL(unregister_sound_special); | |
442 | ||
443 | /** | |
444 | * unregister_sound_mixer - unregister a mixer | |
445 | * @unit: unit number to allocate | |
446 | * | |
447 | * Release a sound device that was allocated with register_sound_mixer(). | |
448 | * The unit passed is the return value from the register function. | |
449 | */ | |
450 | ||
451 | void unregister_sound_mixer(int unit) | |
452 | { | |
453 | sound_remove_unit(&chains[0], unit); | |
454 | } | |
455 | ||
456 | EXPORT_SYMBOL(unregister_sound_mixer); | |
457 | ||
458 | /** | |
459 | * unregister_sound_midi - unregister a midi device | |
460 | * @unit: unit number to allocate | |
461 | * | |
462 | * Release a sound device that was allocated with register_sound_midi(). | |
463 | * The unit passed is the return value from the register function. | |
464 | */ | |
465 | ||
466 | void unregister_sound_midi(int unit) | |
467 | { | |
a39c4ad1 | 468 | sound_remove_unit(&chains[2], unit); |
1da177e4 LT |
469 | } |
470 | ||
471 | EXPORT_SYMBOL(unregister_sound_midi); | |
472 | ||
473 | /** | |
474 | * unregister_sound_dsp - unregister a DSP device | |
475 | * @unit: unit number to allocate | |
476 | * | |
477 | * Release a sound device that was allocated with register_sound_dsp(). | |
478 | * The unit passed is the return value from the register function. | |
479 | * | |
480 | * Both of the allocated units are released together automatically. | |
481 | */ | |
482 | ||
483 | void unregister_sound_dsp(int unit) | |
484 | { | |
a39c4ad1 | 485 | sound_remove_unit(&chains[3], unit); |
1da177e4 LT |
486 | } |
487 | ||
488 | ||
489 | EXPORT_SYMBOL(unregister_sound_dsp); | |
490 | ||
1da177e4 LT |
491 | /* |
492 | * Now our file operations | |
493 | */ | |
494 | ||
495 | static int soundcore_open(struct inode *, struct file *); | |
496 | ||
9c2e08c5 | 497 | static const struct file_operations soundcore_fops= |
1da177e4 LT |
498 | { |
499 | /* We must have an owner or the module locking fails */ | |
500 | .owner = THIS_MODULE, | |
501 | .open = soundcore_open, | |
502 | }; | |
503 | ||
504 | static struct sound_unit *__look_for_unit(int chain, int unit) | |
505 | { | |
506 | struct sound_unit *s; | |
507 | ||
508 | s=chains[chain]; | |
509 | while(s && s->unit_minor <= unit) | |
510 | { | |
511 | if(s->unit_minor==unit) | |
512 | return s; | |
513 | s=s->next; | |
514 | } | |
515 | return NULL; | |
516 | } | |
517 | ||
a39c4ad1 | 518 | static int soundcore_open(struct inode *inode, struct file *file) |
1da177e4 LT |
519 | { |
520 | int chain; | |
521 | int unit = iminor(inode); | |
522 | struct sound_unit *s; | |
99ac48f5 | 523 | const struct file_operations *new_fops = NULL; |
1da177e4 | 524 | |
78a3c3d7 JC |
525 | lock_kernel (); |
526 | ||
1da177e4 LT |
527 | chain=unit&0x0F; |
528 | if(chain==4 || chain==5) /* dsp/audio/dsp16 */ | |
529 | { | |
530 | unit&=0xF0; | |
531 | unit|=3; | |
532 | chain=3; | |
533 | } | |
534 | ||
535 | spin_lock(&sound_loader_lock); | |
536 | s = __look_for_unit(chain, unit); | |
537 | if (s) | |
538 | new_fops = fops_get(s->unit_fops); | |
539 | if (!new_fops) { | |
540 | spin_unlock(&sound_loader_lock); | |
541 | /* | |
542 | * Please, don't change this order or code. | |
543 | * For ALSA slot means soundcard and OSS emulation code | |
544 | * comes as add-on modules which aren't depend on | |
545 | * ALSA toplevel modules for soundcards, thus we need | |
546 | * load them at first. [Jaroslav Kysela <perex@jcu.cz>] | |
547 | */ | |
548 | request_module("sound-slot-%i", unit>>4); | |
549 | request_module("sound-service-%i-%i", unit>>4, chain); | |
550 | spin_lock(&sound_loader_lock); | |
551 | s = __look_for_unit(chain, unit); | |
552 | if (s) | |
553 | new_fops = fops_get(s->unit_fops); | |
554 | } | |
555 | if (new_fops) { | |
556 | /* | |
557 | * We rely upon the fact that we can't be unloaded while the | |
558 | * subdriver is there, so if ->open() is successful we can | |
559 | * safely drop the reference counter and if it is not we can | |
560 | * revert to old ->f_op. Ugly, indeed, but that's the cost of | |
561 | * switching ->f_op in the first place. | |
562 | */ | |
563 | int err = 0; | |
99ac48f5 | 564 | const struct file_operations *old_fops = file->f_op; |
1da177e4 LT |
565 | file->f_op = new_fops; |
566 | spin_unlock(&sound_loader_lock); | |
567 | if(file->f_op->open) | |
568 | err = file->f_op->open(inode,file); | |
569 | if (err) { | |
570 | fops_put(file->f_op); | |
571 | file->f_op = fops_get(old_fops); | |
572 | } | |
573 | fops_put(old_fops); | |
78a3c3d7 | 574 | unlock_kernel(); |
1da177e4 LT |
575 | return err; |
576 | } | |
577 | spin_unlock(&sound_loader_lock); | |
78a3c3d7 | 578 | unlock_kernel(); |
1da177e4 LT |
579 | return -ENODEV; |
580 | } | |
581 | ||
1da177e4 LT |
582 | MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); |
583 | ||
de30d36b | 584 | static void cleanup_oss_soundcore(void) |
1da177e4 LT |
585 | { |
586 | /* We have nothing to really do here - we know the lists must be | |
587 | empty */ | |
588 | unregister_chrdev(SOUND_MAJOR, "sound"); | |
1da177e4 LT |
589 | } |
590 | ||
d886e87c | 591 | static int __init init_oss_soundcore(void) |
1da177e4 LT |
592 | { |
593 | if (register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops)==-1) { | |
594 | printk(KERN_ERR "soundcore: sound device already in use.\n"); | |
595 | return -EBUSY; | |
596 | } | |
1da177e4 LT |
597 | |
598 | return 0; | |
599 | } | |
600 | ||
d886e87c | 601 | #endif /* CONFIG_SOUND_OSS_CORE */ |