Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Sound core handling. Breaks out sound functions to submodules |
| 3 | * |
| 4 | * Author: Alan Cox <alan.cox@linux.org> |
| 5 | * |
| 6 | * Fixes: |
| 7 | * |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * -------------------- |
| 15 | * |
| 16 | * Top level handler for the sound subsystem. Various devices can |
| 17 | * plug into this. The fact they don't all go via OSS doesn't mean |
| 18 | * they don't have to implement the OSS API. There is a lot of logic |
| 19 | * to keeping much of the OSS weight out of the code in a compatibility |
| 20 | * module, but it's up to the driver to rember to load it... |
| 21 | * |
| 22 | * The code provides a set of functions for registration of devices |
| 23 | * by type. This is done rather than providing a single call so that |
| 24 | * we can hide any future changes in the internals (eg when we go to |
| 25 | * 32bit dev_t) from the modules and their interface. |
| 26 | * |
| 27 | * Secondly we need to allocate the dsp, dsp16 and audio devices as |
| 28 | * one. Thus we misuse the chains a bit to simplify this. |
| 29 | * |
| 30 | * Thirdly to make it more fun and for 2.3.x and above we do all |
| 31 | * of this using fine grained locking. |
| 32 | * |
| 33 | * FIXME: we have to resolve modules and fine grained load/unload |
| 34 | * locking at some point in 2.3.x. |
| 35 | */ |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/module.h> |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/types.h> |
| 41 | #include <linux/kernel.h> |
| 42 | #include <linux/fs.h> |
| 43 | #include <linux/sound.h> |
| 44 | #include <linux/major.h> |
| 45 | #include <linux/kmod.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/device.h> |
| 47 | |
| 48 | #define SOUND_STEP 16 |
| 49 | |
| 50 | |
| 51 | struct sound_unit |
| 52 | { |
| 53 | int unit_minor; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 54 | const struct file_operations *unit_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | struct sound_unit *next; |
| 56 | char name[32]; |
| 57 | }; |
| 58 | |
| 59 | #ifdef CONFIG_SOUND_MSNDCLAS |
| 60 | extern int msnd_classic_init(void); |
| 61 | #endif |
| 62 | #ifdef CONFIG_SOUND_MSNDPIN |
| 63 | extern int msnd_pinnacle_init(void); |
| 64 | #endif |
| 65 | |
gregkh@suse.de | 619e666 | 2005-03-23 09:51:41 -0800 | [diff] [blame] | 66 | struct class *sound_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | EXPORT_SYMBOL(sound_class); |
| 68 | |
| 69 | /* |
| 70 | * Low level list operator. Scan the ordered list, find a hole and |
| 71 | * join into it. Called with the lock asserted |
| 72 | */ |
| 73 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 74 | static int __sound_insert_unit(struct sound_unit * s, struct sound_unit **list, const struct file_operations *fops, int index, int low, int top) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
| 76 | int n=low; |
| 77 | |
| 78 | if (index < 0) { /* first free */ |
| 79 | |
| 80 | while (*list && (*list)->unit_minor<n) |
| 81 | list=&((*list)->next); |
| 82 | |
| 83 | while(n<top) |
| 84 | { |
| 85 | /* Found a hole ? */ |
| 86 | if(*list==NULL || (*list)->unit_minor>n) |
| 87 | break; |
| 88 | list=&((*list)->next); |
| 89 | n+=SOUND_STEP; |
| 90 | } |
| 91 | |
| 92 | if(n>=top) |
| 93 | return -ENOENT; |
| 94 | } else { |
| 95 | n = low+(index*16); |
| 96 | while (*list) { |
| 97 | if ((*list)->unit_minor==n) |
| 98 | return -EBUSY; |
| 99 | if ((*list)->unit_minor>n) |
| 100 | break; |
| 101 | list=&((*list)->next); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * Fill it in |
| 107 | */ |
| 108 | |
| 109 | s->unit_minor=n; |
| 110 | s->unit_fops=fops; |
| 111 | |
| 112 | /* |
| 113 | * Link it |
| 114 | */ |
| 115 | |
| 116 | s->next=*list; |
| 117 | *list=s; |
| 118 | |
| 119 | |
| 120 | return n; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Remove a node from the chain. Called with the lock asserted |
| 125 | */ |
| 126 | |
| 127 | static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit) |
| 128 | { |
| 129 | while(*list) |
| 130 | { |
| 131 | struct sound_unit *p=*list; |
| 132 | if(p->unit_minor==unit) |
| 133 | { |
| 134 | *list=p->next; |
| 135 | return p; |
| 136 | } |
| 137 | list=&(p->next); |
| 138 | } |
| 139 | printk(KERN_ERR "Sound device %d went missing!\n", unit); |
| 140 | return NULL; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * This lock guards the sound loader list. |
| 145 | */ |
| 146 | |
| 147 | static DEFINE_SPINLOCK(sound_loader_lock); |
| 148 | |
| 149 | /* |
| 150 | * Allocate the controlling structure and add it to the sound driver |
| 151 | * list. Acquires locks as needed |
| 152 | */ |
| 153 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 154 | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
| 156 | struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 157 | int r; |
| 158 | |
| 159 | if (!s) |
| 160 | return -ENOMEM; |
| 161 | |
| 162 | spin_lock(&sound_loader_lock); |
| 163 | r = __sound_insert_unit(s, list, fops, index, low, top); |
| 164 | spin_unlock(&sound_loader_lock); |
| 165 | |
| 166 | if (r < 0) |
| 167 | goto fail; |
| 168 | else if (r < SOUND_STEP) |
| 169 | sprintf(s->name, "sound/%s", name); |
| 170 | else |
| 171 | sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP); |
| 172 | |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame^] | 173 | device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), |
| 174 | s->name+6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | return r; |
| 176 | |
| 177 | fail: |
| 178 | kfree(s); |
| 179 | return r; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Remove a unit. Acquires locks as needed. The drivers MUST have |
| 184 | * completed the removal before their file operations become |
| 185 | * invalid. |
| 186 | */ |
| 187 | |
| 188 | static void sound_remove_unit(struct sound_unit **list, int unit) |
| 189 | { |
| 190 | struct sound_unit *p; |
| 191 | |
| 192 | spin_lock(&sound_loader_lock); |
| 193 | p = __sound_remove_unit(list, unit); |
| 194 | spin_unlock(&sound_loader_lock); |
| 195 | if (p) { |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame^] | 196 | device_destroy(sound_class, MKDEV(SOUND_MAJOR, p->unit_minor)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | kfree(p); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * Allocations |
| 203 | * |
| 204 | * 0 *16 Mixers |
| 205 | * 1 *8 Sequencers |
| 206 | * 2 *16 Midi |
| 207 | * 3 *16 DSP |
| 208 | * 4 *16 SunDSP |
| 209 | * 5 *16 DSP16 |
| 210 | * 6 -- sndstat (obsolete) |
| 211 | * 7 *16 unused |
| 212 | * 8 -- alternate sequencer (see above) |
| 213 | * 9 *16 raw synthesizer access |
| 214 | * 10 *16 unused |
| 215 | * 11 *16 unused |
| 216 | * 12 *16 unused |
| 217 | * 13 *16 unused |
| 218 | * 14 *16 unused |
| 219 | * 15 *16 unused |
| 220 | */ |
| 221 | |
| 222 | static struct sound_unit *chains[SOUND_STEP]; |
| 223 | |
| 224 | /** |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 225 | * register_sound_special_device - register a special sound node |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | * @fops: File operations for the driver |
| 227 | * @unit: Unit number to allocate |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 228 | * @dev: device pointer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | * |
| 230 | * Allocate a special sound device by minor number from the sound |
| 231 | * subsystem. The allocated number is returned on succes. On failure |
| 232 | * a negative error code is returned. |
| 233 | */ |
| 234 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 235 | int register_sound_special_device(const struct file_operations *fops, int unit, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 236 | struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
| 238 | const int chain = unit % SOUND_STEP; |
| 239 | int max_unit = 128 + chain; |
| 240 | const char *name; |
| 241 | char _name[16]; |
| 242 | |
| 243 | switch (chain) { |
| 244 | case 0: |
| 245 | name = "mixer"; |
| 246 | break; |
| 247 | case 1: |
| 248 | name = "sequencer"; |
| 249 | if (unit >= SOUND_STEP) |
| 250 | goto __unknown; |
| 251 | max_unit = unit + 1; |
| 252 | break; |
| 253 | case 2: |
| 254 | name = "midi"; |
| 255 | break; |
| 256 | case 3: |
| 257 | name = "dsp"; |
| 258 | break; |
| 259 | case 4: |
| 260 | name = "audio"; |
| 261 | break; |
| 262 | case 8: |
| 263 | name = "sequencer2"; |
| 264 | if (unit >= SOUND_STEP) |
| 265 | goto __unknown; |
| 266 | max_unit = unit + 1; |
| 267 | break; |
| 268 | case 9: |
| 269 | name = "dmmidi"; |
| 270 | break; |
| 271 | case 10: |
| 272 | name = "dmfm"; |
| 273 | break; |
| 274 | case 12: |
| 275 | name = "adsp"; |
| 276 | break; |
| 277 | case 13: |
| 278 | name = "amidi"; |
| 279 | break; |
| 280 | case 14: |
| 281 | name = "admmidi"; |
| 282 | break; |
| 283 | default: |
| 284 | { |
| 285 | __unknown: |
| 286 | sprintf(_name, "unknown%d", chain); |
| 287 | if (unit >= SOUND_STEP) |
| 288 | strcat(_name, "-"); |
| 289 | name = _name; |
| 290 | } |
| 291 | break; |
| 292 | } |
| 293 | return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 294 | name, S_IRUSR | S_IWUSR, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 297 | EXPORT_SYMBOL(register_sound_special_device); |
| 298 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 299 | int register_sound_special(const struct file_operations *fops, int unit) |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 300 | { |
| 301 | return register_sound_special_device(fops, unit, NULL); |
| 302 | } |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | EXPORT_SYMBOL(register_sound_special); |
| 305 | |
| 306 | /** |
| 307 | * register_sound_mixer - register a mixer device |
| 308 | * @fops: File operations for the driver |
| 309 | * @dev: Unit number to allocate |
| 310 | * |
| 311 | * Allocate a mixer device. Unit is the number of the mixer requested. |
| 312 | * Pass -1 to request the next free mixer unit. On success the allocated |
| 313 | * number is returned, on failure a negative error code is returned. |
| 314 | */ |
| 315 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 316 | int register_sound_mixer(const struct file_operations *fops, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
| 318 | return sound_insert_unit(&chains[0], fops, dev, 0, 128, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 319 | "mixer", S_IRUSR | S_IWUSR, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | EXPORT_SYMBOL(register_sound_mixer); |
| 323 | |
| 324 | /** |
| 325 | * register_sound_midi - register a midi device |
| 326 | * @fops: File operations for the driver |
| 327 | * @dev: Unit number to allocate |
| 328 | * |
| 329 | * Allocate a midi device. Unit is the number of the midi device requested. |
| 330 | * Pass -1 to request the next free midi unit. On success the allocated |
| 331 | * number is returned, on failure a negative error code is returned. |
| 332 | */ |
| 333 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 334 | int register_sound_midi(const struct file_operations *fops, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
| 336 | return sound_insert_unit(&chains[2], fops, dev, 2, 130, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 337 | "midi", S_IRUSR | S_IWUSR, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | EXPORT_SYMBOL(register_sound_midi); |
| 341 | |
| 342 | /* |
| 343 | * DSP's are registered as a triple. Register only one and cheat |
| 344 | * in open - see below. |
| 345 | */ |
| 346 | |
| 347 | /** |
| 348 | * register_sound_dsp - register a DSP device |
| 349 | * @fops: File operations for the driver |
| 350 | * @dev: Unit number to allocate |
| 351 | * |
| 352 | * Allocate a DSP device. Unit is the number of the DSP requested. |
| 353 | * Pass -1 to request the next free DSP unit. On success the allocated |
| 354 | * number is returned, on failure a negative error code is returned. |
| 355 | * |
| 356 | * This function allocates both the audio and dsp device entries together |
| 357 | * and will always allocate them as a matching pair - eg dsp3/audio3 |
| 358 | */ |
| 359 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 360 | int register_sound_dsp(const struct file_operations *fops, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
| 362 | return sound_insert_unit(&chains[3], fops, dev, 3, 131, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 363 | "dsp", S_IWUSR | S_IRUSR, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | EXPORT_SYMBOL(register_sound_dsp); |
| 367 | |
| 368 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | * unregister_sound_special - unregister a special sound device |
| 370 | * @unit: unit number to allocate |
| 371 | * |
| 372 | * Release a sound device that was allocated with |
| 373 | * register_sound_special(). The unit passed is the return value from |
| 374 | * the register function. |
| 375 | */ |
| 376 | |
| 377 | |
| 378 | void unregister_sound_special(int unit) |
| 379 | { |
| 380 | sound_remove_unit(&chains[unit % SOUND_STEP], unit); |
| 381 | } |
| 382 | |
| 383 | EXPORT_SYMBOL(unregister_sound_special); |
| 384 | |
| 385 | /** |
| 386 | * unregister_sound_mixer - unregister a mixer |
| 387 | * @unit: unit number to allocate |
| 388 | * |
| 389 | * Release a sound device that was allocated with register_sound_mixer(). |
| 390 | * The unit passed is the return value from the register function. |
| 391 | */ |
| 392 | |
| 393 | void unregister_sound_mixer(int unit) |
| 394 | { |
| 395 | sound_remove_unit(&chains[0], unit); |
| 396 | } |
| 397 | |
| 398 | EXPORT_SYMBOL(unregister_sound_mixer); |
| 399 | |
| 400 | /** |
| 401 | * unregister_sound_midi - unregister a midi device |
| 402 | * @unit: unit number to allocate |
| 403 | * |
| 404 | * Release a sound device that was allocated with register_sound_midi(). |
| 405 | * The unit passed is the return value from the register function. |
| 406 | */ |
| 407 | |
| 408 | void unregister_sound_midi(int unit) |
| 409 | { |
| 410 | return sound_remove_unit(&chains[2], unit); |
| 411 | } |
| 412 | |
| 413 | EXPORT_SYMBOL(unregister_sound_midi); |
| 414 | |
| 415 | /** |
| 416 | * unregister_sound_dsp - unregister a DSP device |
| 417 | * @unit: unit number to allocate |
| 418 | * |
| 419 | * Release a sound device that was allocated with register_sound_dsp(). |
| 420 | * The unit passed is the return value from the register function. |
| 421 | * |
| 422 | * Both of the allocated units are released together automatically. |
| 423 | */ |
| 424 | |
| 425 | void unregister_sound_dsp(int unit) |
| 426 | { |
| 427 | return sound_remove_unit(&chains[3], unit); |
| 428 | } |
| 429 | |
| 430 | |
| 431 | EXPORT_SYMBOL(unregister_sound_dsp); |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | /* |
| 434 | * Now our file operations |
| 435 | */ |
| 436 | |
| 437 | static int soundcore_open(struct inode *, struct file *); |
| 438 | |
| 439 | static struct file_operations soundcore_fops= |
| 440 | { |
| 441 | /* We must have an owner or the module locking fails */ |
| 442 | .owner = THIS_MODULE, |
| 443 | .open = soundcore_open, |
| 444 | }; |
| 445 | |
| 446 | static struct sound_unit *__look_for_unit(int chain, int unit) |
| 447 | { |
| 448 | struct sound_unit *s; |
| 449 | |
| 450 | s=chains[chain]; |
| 451 | while(s && s->unit_minor <= unit) |
| 452 | { |
| 453 | if(s->unit_minor==unit) |
| 454 | return s; |
| 455 | s=s->next; |
| 456 | } |
| 457 | return NULL; |
| 458 | } |
| 459 | |
| 460 | int soundcore_open(struct inode *inode, struct file *file) |
| 461 | { |
| 462 | int chain; |
| 463 | int unit = iminor(inode); |
| 464 | struct sound_unit *s; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 465 | const struct file_operations *new_fops = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | chain=unit&0x0F; |
| 468 | if(chain==4 || chain==5) /* dsp/audio/dsp16 */ |
| 469 | { |
| 470 | unit&=0xF0; |
| 471 | unit|=3; |
| 472 | chain=3; |
| 473 | } |
| 474 | |
| 475 | spin_lock(&sound_loader_lock); |
| 476 | s = __look_for_unit(chain, unit); |
| 477 | if (s) |
| 478 | new_fops = fops_get(s->unit_fops); |
| 479 | if (!new_fops) { |
| 480 | spin_unlock(&sound_loader_lock); |
| 481 | /* |
| 482 | * Please, don't change this order or code. |
| 483 | * For ALSA slot means soundcard and OSS emulation code |
| 484 | * comes as add-on modules which aren't depend on |
| 485 | * ALSA toplevel modules for soundcards, thus we need |
| 486 | * load them at first. [Jaroslav Kysela <perex@jcu.cz>] |
| 487 | */ |
| 488 | request_module("sound-slot-%i", unit>>4); |
| 489 | request_module("sound-service-%i-%i", unit>>4, chain); |
| 490 | spin_lock(&sound_loader_lock); |
| 491 | s = __look_for_unit(chain, unit); |
| 492 | if (s) |
| 493 | new_fops = fops_get(s->unit_fops); |
| 494 | } |
| 495 | if (new_fops) { |
| 496 | /* |
| 497 | * We rely upon the fact that we can't be unloaded while the |
| 498 | * subdriver is there, so if ->open() is successful we can |
| 499 | * safely drop the reference counter and if it is not we can |
| 500 | * revert to old ->f_op. Ugly, indeed, but that's the cost of |
| 501 | * switching ->f_op in the first place. |
| 502 | */ |
| 503 | int err = 0; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 504 | const struct file_operations *old_fops = file->f_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | file->f_op = new_fops; |
| 506 | spin_unlock(&sound_loader_lock); |
| 507 | if(file->f_op->open) |
| 508 | err = file->f_op->open(inode,file); |
| 509 | if (err) { |
| 510 | fops_put(file->f_op); |
| 511 | file->f_op = fops_get(old_fops); |
| 512 | } |
| 513 | fops_put(old_fops); |
| 514 | return err; |
| 515 | } |
| 516 | spin_unlock(&sound_loader_lock); |
| 517 | return -ENODEV; |
| 518 | } |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | MODULE_DESCRIPTION("Core sound module"); |
| 521 | MODULE_AUTHOR("Alan Cox"); |
| 522 | MODULE_LICENSE("GPL"); |
| 523 | MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); |
| 524 | |
| 525 | static void __exit cleanup_soundcore(void) |
| 526 | { |
| 527 | /* We have nothing to really do here - we know the lists must be |
| 528 | empty */ |
| 529 | unregister_chrdev(SOUND_MAJOR, "sound"); |
gregkh@suse.de | 619e666 | 2005-03-23 09:51:41 -0800 | [diff] [blame] | 530 | class_destroy(sound_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | static int __init init_soundcore(void) |
| 534 | { |
| 535 | if (register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops)==-1) { |
| 536 | printk(KERN_ERR "soundcore: sound device already in use.\n"); |
| 537 | return -EBUSY; |
| 538 | } |
gregkh@suse.de | 619e666 | 2005-03-23 09:51:41 -0800 | [diff] [blame] | 539 | sound_class = class_create(THIS_MODULE, "sound"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | if (IS_ERR(sound_class)) |
| 541 | return PTR_ERR(sound_class); |
| 542 | |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | module_init(init_soundcore); |
| 547 | module_exit(cleanup_soundcore); |