Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 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> |
Kay Sievers | 954a973 | 2009-07-03 20:56:05 +0200 | [diff] [blame] | 13 | #include <linux/kdev_t.h> |
| 14 | #include <linux/major.h> |
Mark Brown | 3d1ee37 | 2008-12-15 15:43:43 +0000 | [diff] [blame] | 15 | #include <sound/core.h> |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 16 | |
| 17 | #ifdef CONFIG_SOUND_OSS_CORE |
| 18 | static int __init init_oss_soundcore(void); |
Krzysztof Helt | de30d36 | 2008-09-07 17:24:33 +0200 | [diff] [blame] | 19 | static void cleanup_oss_soundcore(void); |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 20 | #else |
| 21 | static inline int init_oss_soundcore(void) { return 0; } |
| 22 | static inline void cleanup_oss_soundcore(void) { } |
| 23 | #endif |
| 24 | |
| 25 | struct class *sound_class; |
| 26 | EXPORT_SYMBOL(sound_class); |
| 27 | |
| 28 | MODULE_DESCRIPTION("Core sound module"); |
| 29 | MODULE_AUTHOR("Alan Cox"); |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | |
Al Viro | 2c9ede5 | 2011-07-23 20:24:48 -0400 | [diff] [blame] | 32 | static char *sound_devnode(struct device *dev, umode_t *mode) |
Kay Sievers | 7a9d56f | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 33 | { |
Kay Sievers | 954a973 | 2009-07-03 20:56:05 +0200 | [diff] [blame] | 34 | if (MAJOR(dev->devt) == SOUND_MAJOR) |
| 35 | return NULL; |
Kay Sievers | 7a9d56f | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 36 | return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev)); |
| 37 | } |
| 38 | |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 39 | static int __init init_soundcore(void) |
| 40 | { |
| 41 | int rc; |
| 42 | |
| 43 | rc = init_oss_soundcore(); |
| 44 | if (rc) |
| 45 | return rc; |
| 46 | |
| 47 | sound_class = class_create(THIS_MODULE, "sound"); |
| 48 | if (IS_ERR(sound_class)) { |
| 49 | cleanup_oss_soundcore(); |
| 50 | return PTR_ERR(sound_class); |
| 51 | } |
| 52 | |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 53 | sound_class->devnode = sound_devnode; |
Kay Sievers | 7a9d56f | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 54 | |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | static void __exit cleanup_soundcore(void) |
| 59 | { |
| 60 | cleanup_oss_soundcore(); |
| 61 | class_destroy(sound_class); |
| 62 | } |
| 63 | |
Thadeu Lima de Souza Cascardo | c181a13 | 2010-01-12 20:20:39 -0200 | [diff] [blame] | 64 | subsys_initcall(init_soundcore); |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 65 | module_exit(cleanup_soundcore); |
| 66 | |
| 67 | |
| 68 | #ifdef CONFIG_SOUND_OSS_CORE |
| 69 | /* |
| 70 | * OSS sound core handling. Breaks out sound functions to submodules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | * |
Alan Cox | 2f1e593 | 2008-10-27 15:21:19 +0000 | [diff] [blame] | 72 | * Author: Alan Cox <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | * |
| 74 | * Fixes: |
| 75 | * |
| 76 | * |
| 77 | * This program is free software; you can redistribute it and/or |
| 78 | * modify it under the terms of the GNU General Public License |
| 79 | * as published by the Free Software Foundation; either version |
| 80 | * 2 of the License, or (at your option) any later version. |
| 81 | * |
| 82 | * -------------------- |
| 83 | * |
| 84 | * Top level handler for the sound subsystem. Various devices can |
| 85 | * plug into this. The fact they don't all go via OSS doesn't mean |
| 86 | * they don't have to implement the OSS API. There is a lot of logic |
| 87 | * to keeping much of the OSS weight out of the code in a compatibility |
| 88 | * module, but it's up to the driver to rember to load it... |
| 89 | * |
| 90 | * The code provides a set of functions for registration of devices |
| 91 | * by type. This is done rather than providing a single call so that |
| 92 | * we can hide any future changes in the internals (eg when we go to |
| 93 | * 32bit dev_t) from the modules and their interface. |
| 94 | * |
| 95 | * Secondly we need to allocate the dsp, dsp16 and audio devices as |
| 96 | * one. Thus we misuse the chains a bit to simplify this. |
| 97 | * |
| 98 | * Thirdly to make it more fun and for 2.3.x and above we do all |
| 99 | * of this using fine grained locking. |
| 100 | * |
| 101 | * FIXME: we have to resolve modules and fine grained load/unload |
| 102 | * locking at some point in 2.3.x. |
| 103 | */ |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #include <linux/init.h> |
| 106 | #include <linux/slab.h> |
| 107 | #include <linux/types.h> |
| 108 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #include <linux/sound.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #include <linux/kmod.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | #define SOUND_STEP 16 |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | struct sound_unit |
| 115 | { |
| 116 | int unit_minor; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 117 | const struct file_operations *unit_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | struct sound_unit *next; |
| 119 | char name[32]; |
| 120 | }; |
| 121 | |
| 122 | #ifdef CONFIG_SOUND_MSNDCLAS |
| 123 | extern int msnd_classic_init(void); |
| 124 | #endif |
| 125 | #ifdef CONFIG_SOUND_MSNDPIN |
| 126 | extern int msnd_pinnacle_init(void); |
| 127 | #endif |
| 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | /* |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 130 | * By default, OSS sound_core claims full legacy minor range (0-255) |
| 131 | * of SOUND_MAJOR to trap open attempts to any sound minor and |
| 132 | * requests modules using custom sound-slot/service-* module aliases. |
| 133 | * The only benefit of doing this is allowing use of custom module |
| 134 | * aliases instead of the standard char-major-* ones. This behavior |
| 135 | * prevents alternative OSS implementation and is scheduled to be |
| 136 | * removed. |
| 137 | * |
| 138 | * CONFIG_SOUND_OSS_CORE_PRECLAIM and soundcore.preclaim_oss kernel |
| 139 | * parameter are added to allow distros and developers to try and |
| 140 | * switch to alternative implementations without needing to rebuild |
| 141 | * the kernel in the meantime. If preclaim_oss is non-zero, the |
| 142 | * kernel will behave the same as before. All SOUND_MAJOR minors are |
| 143 | * preclaimed and the custom module aliases along with standard chrdev |
| 144 | * ones are emitted if a missing device is opened. If preclaim_oss is |
| 145 | * zero, sound_core only grabs what's actually in use and for missing |
| 146 | * devices only the standard chrdev aliases are requested. |
| 147 | * |
| 148 | * All these clutters are scheduled to be removed along with |
Tao Ma | 8f6e604 | 2012-12-17 15:59:37 -0800 | [diff] [blame] | 149 | * sound-slot/service-* module aliases. |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 150 | */ |
| 151 | #ifdef CONFIG_SOUND_OSS_CORE_PRECLAIM |
| 152 | static int preclaim_oss = 1; |
| 153 | #else |
| 154 | static int preclaim_oss = 0; |
| 155 | #endif |
| 156 | |
| 157 | module_param(preclaim_oss, int, 0444); |
| 158 | |
| 159 | static int soundcore_open(struct inode *, struct file *); |
| 160 | |
| 161 | static const struct file_operations soundcore_fops = |
| 162 | { |
| 163 | /* We must have an owner or the module locking fails */ |
| 164 | .owner = THIS_MODULE, |
| 165 | .open = soundcore_open, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 166 | .llseek = noop_llseek, |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 167 | }; |
| 168 | |
| 169 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | * Low level list operator. Scan the ordered list, find a hole and |
| 171 | * join into it. Called with the lock asserted |
| 172 | */ |
| 173 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 174 | 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] | 175 | { |
| 176 | int n=low; |
| 177 | |
| 178 | if (index < 0) { /* first free */ |
| 179 | |
| 180 | while (*list && (*list)->unit_minor<n) |
| 181 | list=&((*list)->next); |
| 182 | |
| 183 | while(n<top) |
| 184 | { |
| 185 | /* Found a hole ? */ |
| 186 | if(*list==NULL || (*list)->unit_minor>n) |
| 187 | break; |
| 188 | list=&((*list)->next); |
| 189 | n+=SOUND_STEP; |
| 190 | } |
| 191 | |
| 192 | if(n>=top) |
| 193 | return -ENOENT; |
| 194 | } else { |
| 195 | n = low+(index*16); |
| 196 | while (*list) { |
| 197 | if ((*list)->unit_minor==n) |
| 198 | return -EBUSY; |
| 199 | if ((*list)->unit_minor>n) |
| 200 | break; |
| 201 | list=&((*list)->next); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * Fill it in |
| 207 | */ |
| 208 | |
| 209 | s->unit_minor=n; |
| 210 | s->unit_fops=fops; |
| 211 | |
| 212 | /* |
| 213 | * Link it |
| 214 | */ |
| 215 | |
| 216 | s->next=*list; |
| 217 | *list=s; |
| 218 | |
| 219 | |
| 220 | return n; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Remove a node from the chain. Called with the lock asserted |
| 225 | */ |
| 226 | |
| 227 | static struct sound_unit *__sound_remove_unit(struct sound_unit **list, int unit) |
| 228 | { |
| 229 | while(*list) |
| 230 | { |
| 231 | struct sound_unit *p=*list; |
| 232 | if(p->unit_minor==unit) |
| 233 | { |
| 234 | *list=p->next; |
| 235 | return p; |
| 236 | } |
| 237 | list=&(p->next); |
| 238 | } |
| 239 | printk(KERN_ERR "Sound device %d went missing!\n", unit); |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * This lock guards the sound loader list. |
| 245 | */ |
| 246 | |
| 247 | static DEFINE_SPINLOCK(sound_loader_lock); |
| 248 | |
| 249 | /* |
| 250 | * Allocate the controlling structure and add it to the sound driver |
| 251 | * list. Acquires locks as needed |
| 252 | */ |
| 253 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 254 | 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] | 255 | { |
| 256 | struct sound_unit *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 257 | int r; |
| 258 | |
| 259 | if (!s) |
| 260 | return -ENOMEM; |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | spin_lock(&sound_loader_lock); |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 263 | retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | r = __sound_insert_unit(s, list, fops, index, low, top); |
| 265 | spin_unlock(&sound_loader_lock); |
| 266 | |
| 267 | if (r < 0) |
| 268 | goto fail; |
| 269 | else if (r < SOUND_STEP) |
| 270 | sprintf(s->name, "sound/%s", name); |
| 271 | else |
| 272 | sprintf(s->name, "sound/%s%d", name, r / SOUND_STEP); |
| 273 | |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 274 | if (!preclaim_oss) { |
| 275 | /* |
| 276 | * Something else might have grabbed the minor. If |
| 277 | * first free slot is requested, rescan with @low set |
| 278 | * to the next unit; otherwise, -EBUSY. |
| 279 | */ |
| 280 | r = __register_chrdev(SOUND_MAJOR, s->unit_minor, 1, s->name, |
| 281 | &soundcore_fops); |
| 282 | if (r < 0) { |
| 283 | spin_lock(&sound_loader_lock); |
| 284 | __sound_remove_unit(list, s->unit_minor); |
| 285 | if (index < 0) { |
| 286 | low = s->unit_minor + SOUND_STEP; |
| 287 | goto retry; |
| 288 | } |
| 289 | spin_unlock(&sound_loader_lock); |
| 290 | return -EBUSY; |
| 291 | } |
| 292 | } |
| 293 | |
Greg Kroah-Hartman | abe9ab8 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 294 | device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor), |
| 295 | NULL, s->name+6); |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 296 | return s->unit_minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 298 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | kfree(s); |
| 300 | return r; |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Remove a unit. Acquires locks as needed. The drivers MUST have |
| 305 | * completed the removal before their file operations become |
| 306 | * invalid. |
| 307 | */ |
| 308 | |
| 309 | static void sound_remove_unit(struct sound_unit **list, int unit) |
| 310 | { |
| 311 | struct sound_unit *p; |
| 312 | |
| 313 | spin_lock(&sound_loader_lock); |
| 314 | p = __sound_remove_unit(list, unit); |
| 315 | spin_unlock(&sound_loader_lock); |
| 316 | if (p) { |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 317 | if (!preclaim_oss) |
| 318 | __unregister_chrdev(SOUND_MAJOR, p->unit_minor, 1, |
| 319 | p->name); |
Greg Kroah-Hartman | d80f19f | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 320 | device_destroy(sound_class, MKDEV(SOUND_MAJOR, p->unit_minor)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | kfree(p); |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Allocations |
| 327 | * |
| 328 | * 0 *16 Mixers |
| 329 | * 1 *8 Sequencers |
| 330 | * 2 *16 Midi |
| 331 | * 3 *16 DSP |
| 332 | * 4 *16 SunDSP |
| 333 | * 5 *16 DSP16 |
| 334 | * 6 -- sndstat (obsolete) |
| 335 | * 7 *16 unused |
| 336 | * 8 -- alternate sequencer (see above) |
| 337 | * 9 *16 raw synthesizer access |
| 338 | * 10 *16 unused |
| 339 | * 11 *16 unused |
| 340 | * 12 *16 unused |
| 341 | * 13 *16 unused |
| 342 | * 14 *16 unused |
| 343 | * 15 *16 unused |
| 344 | */ |
| 345 | |
| 346 | static struct sound_unit *chains[SOUND_STEP]; |
| 347 | |
| 348 | /** |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 349 | * register_sound_special_device - register a special sound node |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | * @fops: File operations for the driver |
| 351 | * @unit: Unit number to allocate |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 352 | * @dev: device pointer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | * |
| 354 | * Allocate a special sound device by minor number from the sound |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame^] | 355 | * subsystem. |
| 356 | * |
| 357 | * Return: The allocated number is returned on success. On failure, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | * a negative error code is returned. |
| 359 | */ |
| 360 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 361 | int register_sound_special_device(const struct file_operations *fops, int unit, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 362 | struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | { |
| 364 | const int chain = unit % SOUND_STEP; |
Takashi Iwai | 2abb801 | 2012-05-08 17:27:03 +0200 | [diff] [blame] | 365 | int max_unit = 256; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | const char *name; |
| 367 | char _name[16]; |
| 368 | |
| 369 | switch (chain) { |
| 370 | case 0: |
| 371 | name = "mixer"; |
| 372 | break; |
| 373 | case 1: |
| 374 | name = "sequencer"; |
| 375 | if (unit >= SOUND_STEP) |
| 376 | goto __unknown; |
| 377 | max_unit = unit + 1; |
| 378 | break; |
| 379 | case 2: |
| 380 | name = "midi"; |
| 381 | break; |
| 382 | case 3: |
| 383 | name = "dsp"; |
| 384 | break; |
| 385 | case 4: |
| 386 | name = "audio"; |
| 387 | break; |
Takashi Iwai | 848669d | 2011-03-09 17:33:48 +0100 | [diff] [blame] | 388 | case 5: |
| 389 | name = "dspW"; |
| 390 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | case 8: |
| 392 | name = "sequencer2"; |
| 393 | if (unit >= SOUND_STEP) |
| 394 | goto __unknown; |
| 395 | max_unit = unit + 1; |
| 396 | break; |
| 397 | case 9: |
| 398 | name = "dmmidi"; |
| 399 | break; |
| 400 | case 10: |
| 401 | name = "dmfm"; |
| 402 | break; |
| 403 | case 12: |
| 404 | name = "adsp"; |
| 405 | break; |
| 406 | case 13: |
| 407 | name = "amidi"; |
| 408 | break; |
| 409 | case 14: |
| 410 | name = "admmidi"; |
| 411 | break; |
| 412 | default: |
| 413 | { |
| 414 | __unknown: |
| 415 | sprintf(_name, "unknown%d", chain); |
| 416 | if (unit >= SOUND_STEP) |
| 417 | strcat(_name, "-"); |
| 418 | name = _name; |
| 419 | } |
| 420 | break; |
| 421 | } |
| 422 | return sound_insert_unit(&chains[chain], fops, -1, unit, max_unit, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 423 | name, S_IRUSR | S_IWUSR, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 426 | EXPORT_SYMBOL(register_sound_special_device); |
| 427 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 428 | int register_sound_special(const struct file_operations *fops, int unit) |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 429 | { |
| 430 | return register_sound_special_device(fops, unit, NULL); |
| 431 | } |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | EXPORT_SYMBOL(register_sound_special); |
| 434 | |
| 435 | /** |
| 436 | * register_sound_mixer - register a mixer device |
| 437 | * @fops: File operations for the driver |
| 438 | * @dev: Unit number to allocate |
| 439 | * |
| 440 | * Allocate a mixer device. Unit is the number of the mixer requested. |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame^] | 441 | * Pass -1 to request the next free mixer unit. |
| 442 | * |
| 443 | * Return: On success, the allocated number is returned. On failure, |
| 444 | * a negative error code is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | */ |
| 446 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 447 | int register_sound_mixer(const struct file_operations *fops, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | { |
| 449 | return sound_insert_unit(&chains[0], fops, dev, 0, 128, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 450 | "mixer", S_IRUSR | S_IWUSR, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | EXPORT_SYMBOL(register_sound_mixer); |
| 454 | |
| 455 | /** |
| 456 | * register_sound_midi - register a midi device |
| 457 | * @fops: File operations for the driver |
| 458 | * @dev: Unit number to allocate |
| 459 | * |
| 460 | * Allocate a midi device. Unit is the number of the midi device requested. |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame^] | 461 | * Pass -1 to request the next free midi unit. |
| 462 | * |
| 463 | * Return: On success, the allocated number is returned. On failure, |
| 464 | * a negative error code is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | */ |
| 466 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 467 | int register_sound_midi(const struct file_operations *fops, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | { |
| 469 | return sound_insert_unit(&chains[2], fops, dev, 2, 130, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 470 | "midi", S_IRUSR | S_IWUSR, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | EXPORT_SYMBOL(register_sound_midi); |
| 474 | |
| 475 | /* |
| 476 | * DSP's are registered as a triple. Register only one and cheat |
| 477 | * in open - see below. |
| 478 | */ |
| 479 | |
| 480 | /** |
| 481 | * register_sound_dsp - register a DSP device |
| 482 | * @fops: File operations for the driver |
| 483 | * @dev: Unit number to allocate |
| 484 | * |
| 485 | * Allocate a DSP device. Unit is the number of the DSP requested. |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame^] | 486 | * Pass -1 to request the next free DSP unit. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | * |
| 488 | * This function allocates both the audio and dsp device entries together |
| 489 | * and will always allocate them as a matching pair - eg dsp3/audio3 |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame^] | 490 | * |
| 491 | * Return: On success, the allocated number is returned. On failure, |
| 492 | * a negative error code is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | */ |
| 494 | |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 495 | int register_sound_dsp(const struct file_operations *fops, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
| 497 | return sound_insert_unit(&chains[3], fops, dev, 3, 131, |
Takashi Iwai | d568121 | 2005-08-30 08:58:37 +0200 | [diff] [blame] | 498 | "dsp", S_IWUSR | S_IRUSR, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | EXPORT_SYMBOL(register_sound_dsp); |
| 502 | |
| 503 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | * unregister_sound_special - unregister a special sound device |
| 505 | * @unit: unit number to allocate |
| 506 | * |
| 507 | * Release a sound device that was allocated with |
| 508 | * register_sound_special(). The unit passed is the return value from |
| 509 | * the register function. |
| 510 | */ |
| 511 | |
| 512 | |
| 513 | void unregister_sound_special(int unit) |
| 514 | { |
| 515 | sound_remove_unit(&chains[unit % SOUND_STEP], unit); |
| 516 | } |
| 517 | |
| 518 | EXPORT_SYMBOL(unregister_sound_special); |
| 519 | |
| 520 | /** |
| 521 | * unregister_sound_mixer - unregister a mixer |
| 522 | * @unit: unit number to allocate |
| 523 | * |
| 524 | * Release a sound device that was allocated with register_sound_mixer(). |
| 525 | * The unit passed is the return value from the register function. |
| 526 | */ |
| 527 | |
| 528 | void unregister_sound_mixer(int unit) |
| 529 | { |
| 530 | sound_remove_unit(&chains[0], unit); |
| 531 | } |
| 532 | |
| 533 | EXPORT_SYMBOL(unregister_sound_mixer); |
| 534 | |
| 535 | /** |
| 536 | * unregister_sound_midi - unregister a midi device |
| 537 | * @unit: unit number to allocate |
| 538 | * |
| 539 | * Release a sound device that was allocated with register_sound_midi(). |
| 540 | * The unit passed is the return value from the register function. |
| 541 | */ |
| 542 | |
| 543 | void unregister_sound_midi(int unit) |
| 544 | { |
Hannes Eder | a39c4ad | 2008-11-20 21:25:25 +0100 | [diff] [blame] | 545 | sound_remove_unit(&chains[2], unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | EXPORT_SYMBOL(unregister_sound_midi); |
| 549 | |
| 550 | /** |
| 551 | * unregister_sound_dsp - unregister a DSP device |
| 552 | * @unit: unit number to allocate |
| 553 | * |
| 554 | * Release a sound device that was allocated with register_sound_dsp(). |
| 555 | * The unit passed is the return value from the register function. |
| 556 | * |
| 557 | * Both of the allocated units are released together automatically. |
| 558 | */ |
| 559 | |
| 560 | void unregister_sound_dsp(int unit) |
| 561 | { |
Hannes Eder | a39c4ad | 2008-11-20 21:25:25 +0100 | [diff] [blame] | 562 | sound_remove_unit(&chains[3], unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | |
| 566 | EXPORT_SYMBOL(unregister_sound_dsp); |
| 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | static struct sound_unit *__look_for_unit(int chain, int unit) |
| 569 | { |
| 570 | struct sound_unit *s; |
| 571 | |
| 572 | s=chains[chain]; |
| 573 | while(s && s->unit_minor <= unit) |
| 574 | { |
| 575 | if(s->unit_minor==unit) |
| 576 | return s; |
| 577 | s=s->next; |
| 578 | } |
| 579 | return NULL; |
| 580 | } |
| 581 | |
Hannes Eder | a39c4ad | 2008-11-20 21:25:25 +0100 | [diff] [blame] | 582 | static int soundcore_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
| 584 | int chain; |
| 585 | int unit = iminor(inode); |
| 586 | struct sound_unit *s; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 587 | const struct file_operations *new_fops = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
| 589 | chain=unit&0x0F; |
| 590 | if(chain==4 || chain==5) /* dsp/audio/dsp16 */ |
| 591 | { |
| 592 | unit&=0xF0; |
| 593 | unit|=3; |
| 594 | chain=3; |
| 595 | } |
| 596 | |
| 597 | spin_lock(&sound_loader_lock); |
| 598 | s = __look_for_unit(chain, unit); |
| 599 | if (s) |
| 600 | new_fops = fops_get(s->unit_fops); |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 601 | if (preclaim_oss && !new_fops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | spin_unlock(&sound_loader_lock); |
Tejun Heo | 0a84868 | 2009-08-06 18:13:58 +0900 | [diff] [blame] | 603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | /* |
| 605 | * Please, don't change this order or code. |
| 606 | * For ALSA slot means soundcard and OSS emulation code |
| 607 | * comes as add-on modules which aren't depend on |
| 608 | * ALSA toplevel modules for soundcards, thus we need |
| 609 | * load them at first. [Jaroslav Kysela <perex@jcu.cz>] |
| 610 | */ |
| 611 | request_module("sound-slot-%i", unit>>4); |
| 612 | request_module("sound-service-%i-%i", unit>>4, chain); |
Tejun Heo | 0a84868 | 2009-08-06 18:13:58 +0900 | [diff] [blame] | 613 | |
| 614 | /* |
| 615 | * sound-slot/service-* module aliases are scheduled |
| 616 | * for removal in favor of the standard char-major-* |
| 617 | * module aliases. For the time being, generate both |
| 618 | * the legacy and standard module aliases to ease |
| 619 | * transition. |
| 620 | */ |
| 621 | if (request_module("char-major-%d-%d", SOUND_MAJOR, unit) > 0) |
| 622 | request_module("char-major-%d", SOUND_MAJOR); |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | spin_lock(&sound_loader_lock); |
| 625 | s = __look_for_unit(chain, unit); |
| 626 | if (s) |
| 627 | new_fops = fops_get(s->unit_fops); |
| 628 | } |
| 629 | if (new_fops) { |
| 630 | /* |
| 631 | * We rely upon the fact that we can't be unloaded while the |
| 632 | * subdriver is there, so if ->open() is successful we can |
| 633 | * safely drop the reference counter and if it is not we can |
| 634 | * revert to old ->f_op. Ugly, indeed, but that's the cost of |
| 635 | * switching ->f_op in the first place. |
| 636 | */ |
| 637 | int err = 0; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 638 | const struct file_operations *old_fops = file->f_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | file->f_op = new_fops; |
| 640 | spin_unlock(&sound_loader_lock); |
John Kacur | 171d9f7 | 2010-07-04 00:02:31 +0200 | [diff] [blame] | 641 | |
Arnd Bergmann | 90dc763 | 2010-07-11 12:16:36 +0200 | [diff] [blame] | 642 | if (file->f_op->open) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | err = file->f_op->open(inode,file); |
John Kacur | 171d9f7 | 2010-07-04 00:02:31 +0200 | [diff] [blame] | 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (err) { |
| 646 | fops_put(file->f_op); |
| 647 | file->f_op = fops_get(old_fops); |
| 648 | } |
John Kacur | 171d9f7 | 2010-07-04 00:02:31 +0200 | [diff] [blame] | 649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | fops_put(old_fops); |
| 651 | return err; |
| 652 | } |
| 653 | spin_unlock(&sound_loader_lock); |
| 654 | return -ENODEV; |
| 655 | } |
| 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | MODULE_ALIAS_CHARDEV_MAJOR(SOUND_MAJOR); |
| 658 | |
Krzysztof Helt | de30d36 | 2008-09-07 17:24:33 +0200 | [diff] [blame] | 659 | static void cleanup_oss_soundcore(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | { |
| 661 | /* We have nothing to really do here - we know the lists must be |
| 662 | empty */ |
| 663 | unregister_chrdev(SOUND_MAJOR, "sound"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 666 | static int __init init_oss_soundcore(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | { |
Tejun Heo | 93fe448 | 2009-08-06 18:14:26 +0900 | [diff] [blame] | 668 | if (preclaim_oss && |
| 669 | register_chrdev(SOUND_MAJOR, "sound", &soundcore_fops) == -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | printk(KERN_ERR "soundcore: sound device already in use.\n"); |
| 671 | return -EBUSY; |
| 672 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
| 674 | return 0; |
| 675 | } |
| 676 | |
Tejun Heo | d886e87 | 2008-08-28 16:42:51 +0200 | [diff] [blame] | 677 | #endif /* CONFIG_SOUND_OSS_CORE */ |