1 /* 2 * Routines for driver control interface 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/threads.h> 23 #include <linux/interrupt.h> 24 #include <linux/slab.h> 25 #include <linux/vmalloc.h> 26 #include <linux/time.h> 27 #include <sound/core.h> 28 #include <sound/minors.h> 29 #include <sound/info.h> 30 #include <sound/control.h> 31 32 /* max number of user-defined controls */ 33 #define MAX_USER_CONTROLS 32 34 35 struct snd_kctl_ioctl { 36 struct list_head list; /* list of all ioctls */ 37 snd_kctl_ioctl_func_t fioctl; 38 }; 39 40 static DECLARE_RWSEM(snd_ioctl_rwsem); 41 static LIST_HEAD(snd_control_ioctls); 42 #ifdef CONFIG_COMPAT 43 static LIST_HEAD(snd_control_compat_ioctls); 44 #endif 45 46 static int snd_ctl_open(struct inode *inode, struct file *file) 47 { 48 unsigned long flags; 49 struct snd_card *card; 50 struct snd_ctl_file *ctl; 51 int err; 52 53 err = nonseekable_open(inode, file); 54 if (err < 0) 55 return err; 56 57 card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); 58 if (!card) { 59 err = -ENODEV; 60 goto __error1; 61 } 62 err = snd_card_file_add(card, file); 63 if (err < 0) { 64 err = -ENODEV; 65 goto __error1; 66 } 67 if (!try_module_get(card->module)) { 68 err = -EFAULT; 69 goto __error2; 70 } 71 ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); 72 if (ctl == NULL) { 73 err = -ENOMEM; 74 goto __error; 75 } 76 INIT_LIST_HEAD(&ctl->events); 77 init_waitqueue_head(&ctl->change_sleep); 78 spin_lock_init(&ctl->read_lock); 79 ctl->card = card; 80 ctl->prefer_pcm_subdevice = -1; 81 ctl->prefer_rawmidi_subdevice = -1; 82 ctl->pid = get_pid(task_pid(current)); 83 file->private_data = ctl; 84 write_lock_irqsave(&card->ctl_files_rwlock, flags); 85 list_add_tail(&ctl->list, &card->ctl_files); 86 write_unlock_irqrestore(&card->ctl_files_rwlock, flags); 87 return 0; 88 89 __error: 90 module_put(card->module); 91 __error2: 92 snd_card_file_remove(card, file); 93 __error1: 94 return err; 95 } 96 97 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) 98 { 99 unsigned long flags; 100 struct snd_kctl_event *cread; 101 102 spin_lock_irqsave(&ctl->read_lock, flags); 103 while (!list_empty(&ctl->events)) { 104 cread = snd_kctl_event(ctl->events.next); 105 list_del(&cread->list); 106 kfree(cread); 107 } 108 spin_unlock_irqrestore(&ctl->read_lock, flags); 109 } 110 111 static int snd_ctl_release(struct inode *inode, struct file *file) 112 { 113 unsigned long flags; 114 struct snd_card *card; 115 struct snd_ctl_file *ctl; 116 struct snd_kcontrol *control; 117 unsigned int idx; 118 119 ctl = file->private_data; 120 file->private_data = NULL; 121 card = ctl->card; 122 write_lock_irqsave(&card->ctl_files_rwlock, flags); 123 list_del(&ctl->list); 124 write_unlock_irqrestore(&card->ctl_files_rwlock, flags); 125 down_write(&card->controls_rwsem); 126 list_for_each_entry(control, &card->controls, list) 127 for (idx = 0; idx < control->count; idx++) 128 if (control->vd[idx].owner == ctl) 129 control->vd[idx].owner = NULL; 130 up_write(&card->controls_rwsem); 131 snd_ctl_empty_read_queue(ctl); 132 put_pid(ctl->pid); 133 kfree(ctl); 134 module_put(card->module); 135 snd_card_file_remove(card, file); 136 return 0; 137 } 138 139 void snd_ctl_notify(struct snd_card *card, unsigned int mask, 140 struct snd_ctl_elem_id *id) 141 { 142 unsigned long flags; 143 struct snd_ctl_file *ctl; 144 struct snd_kctl_event *ev; 145 146 if (snd_BUG_ON(!card || !id)) 147 return; 148 read_lock(&card->ctl_files_rwlock); 149 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) 150 card->mixer_oss_change_count++; 151 #endif 152 list_for_each_entry(ctl, &card->ctl_files, list) { 153 if (!ctl->subscribed) 154 continue; 155 spin_lock_irqsave(&ctl->read_lock, flags); 156 list_for_each_entry(ev, &ctl->events, list) { 157 if (ev->id.numid == id->numid) { 158 ev->mask |= mask; 159 goto _found; 160 } 161 } 162 ev = kzalloc(sizeof(*ev), GFP_ATOMIC); 163 if (ev) { 164 ev->id = *id; 165 ev->mask = mask; 166 list_add_tail(&ev->list, &ctl->events); 167 } else { 168 snd_printk(KERN_ERR "No memory available to allocate event\n"); 169 } 170 _found: 171 wake_up(&ctl->change_sleep); 172 spin_unlock_irqrestore(&ctl->read_lock, flags); 173 kill_fasync(&ctl->fasync, SIGIO, POLL_IN); 174 } 175 read_unlock(&card->ctl_files_rwlock); 176 } 177 178 EXPORT_SYMBOL(snd_ctl_notify); 179 180 /** 181 * snd_ctl_new - create a control instance from the template 182 * @control: the control template 183 * @access: the default control access 184 * 185 * Allocates a new struct snd_kcontrol instance and copies the given template 186 * to the new instance. It does not copy volatile data (access). 187 * 188 * Returns the pointer of the new instance, or NULL on failure. 189 */ 190 static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, 191 unsigned int access) 192 { 193 struct snd_kcontrol *kctl; 194 unsigned int idx; 195 196 if (snd_BUG_ON(!control || !control->count)) 197 return NULL; 198 kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); 199 if (kctl == NULL) { 200 snd_printk(KERN_ERR "Cannot allocate control instance\n"); 201 return NULL; 202 } 203 *kctl = *control; 204 for (idx = 0; idx < kctl->count; idx++) 205 kctl->vd[idx].access = access; 206 return kctl; 207 } 208 209 /** 210 * snd_ctl_new1 - create a control instance from the template 211 * @ncontrol: the initialization record 212 * @private_data: the private data to set 213 * 214 * Allocates a new struct snd_kcontrol instance and initialize from the given 215 * template. When the access field of ncontrol is 0, it's assumed as 216 * READWRITE access. When the count field is 0, it's assumes as one. 217 * 218 * Returns the pointer of the newly generated instance, or NULL on failure. 219 */ 220 struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, 221 void *private_data) 222 { 223 struct snd_kcontrol kctl; 224 unsigned int access; 225 226 if (snd_BUG_ON(!ncontrol || !ncontrol->info)) 227 return NULL; 228 memset(&kctl, 0, sizeof(kctl)); 229 kctl.id.iface = ncontrol->iface; 230 kctl.id.device = ncontrol->device; 231 kctl.id.subdevice = ncontrol->subdevice; 232 if (ncontrol->name) { 233 strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); 234 if (strcmp(ncontrol->name, kctl.id.name) != 0) 235 snd_printk(KERN_WARNING 236 "Control name '%s' truncated to '%s'\n", 237 ncontrol->name, kctl.id.name); 238 } 239 kctl.id.index = ncontrol->index; 240 kctl.count = ncontrol->count ? ncontrol->count : 1; 241 access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : 242 (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| 243 SNDRV_CTL_ELEM_ACCESS_INACTIVE| 244 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| 245 SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| 246 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); 247 kctl.info = ncontrol->info; 248 kctl.get = ncontrol->get; 249 kctl.put = ncontrol->put; 250 kctl.tlv.p = ncontrol->tlv.p; 251 kctl.private_value = ncontrol->private_value; 252 kctl.private_data = private_data; 253 return snd_ctl_new(&kctl, access); 254 } 255 256 EXPORT_SYMBOL(snd_ctl_new1); 257 258 /** 259 * snd_ctl_free_one - release the control instance 260 * @kcontrol: the control instance 261 * 262 * Releases the control instance created via snd_ctl_new() 263 * or snd_ctl_new1(). 264 * Don't call this after the control was added to the card. 265 */ 266 void snd_ctl_free_one(struct snd_kcontrol *kcontrol) 267 { 268 if (kcontrol) { 269 if (kcontrol->private_free) 270 kcontrol->private_free(kcontrol); 271 kfree(kcontrol); 272 } 273 } 274 275 EXPORT_SYMBOL(snd_ctl_free_one); 276 277 static unsigned int snd_ctl_hole_check(struct snd_card *card, 278 unsigned int count) 279 { 280 struct snd_kcontrol *kctl; 281 282 list_for_each_entry(kctl, &card->controls, list) { 283 if ((kctl->id.numid <= card->last_numid && 284 kctl->id.numid + kctl->count > card->last_numid) || 285 (kctl->id.numid <= card->last_numid + count - 1 && 286 kctl->id.numid + kctl->count > card->last_numid + count - 1)) 287 return card->last_numid = kctl->id.numid + kctl->count - 1; 288 } 289 return card->last_numid; 290 } 291 292 static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) 293 { 294 unsigned int last_numid, iter = 100000; 295 296 last_numid = card->last_numid; 297 while (last_numid != snd_ctl_hole_check(card, count)) { 298 if (--iter == 0) { 299 /* this situation is very unlikely */ 300 snd_printk(KERN_ERR "unable to allocate new control numid\n"); 301 return -ENOMEM; 302 } 303 last_numid = card->last_numid; 304 } 305 return 0; 306 } 307 308 /** 309 * snd_ctl_add - add the control instance to the card 310 * @card: the card instance 311 * @kcontrol: the control instance to add 312 * 313 * Adds the control instance created via snd_ctl_new() or 314 * snd_ctl_new1() to the given card. Assigns also an unique 315 * numid used for fast search. 316 * 317 * Returns zero if successful, or a negative error code on failure. 318 * 319 * It frees automatically the control which cannot be added. 320 */ 321 int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) 322 { 323 struct snd_ctl_elem_id id; 324 unsigned int idx; 325 int err = -EINVAL; 326 327 if (! kcontrol) 328 return err; 329 if (snd_BUG_ON(!card || !kcontrol->info)) 330 goto error; 331 id = kcontrol->id; 332 down_write(&card->controls_rwsem); 333 if (snd_ctl_find_id(card, &id)) { 334 up_write(&card->controls_rwsem); 335 snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", 336 id.iface, 337 id.device, 338 id.subdevice, 339 id.name, 340 id.index); 341 err = -EBUSY; 342 goto error; 343 } 344 if (snd_ctl_find_hole(card, kcontrol->count) < 0) { 345 up_write(&card->controls_rwsem); 346 err = -ENOMEM; 347 goto error; 348 } 349 list_add_tail(&kcontrol->list, &card->controls); 350 card->controls_count += kcontrol->count; 351 kcontrol->id.numid = card->last_numid + 1; 352 card->last_numid += kcontrol->count; 353 up_write(&card->controls_rwsem); 354 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) 355 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); 356 return 0; 357 358 error: 359 snd_ctl_free_one(kcontrol); 360 return err; 361 } 362 363 EXPORT_SYMBOL(snd_ctl_add); 364 365 /** 366 * snd_ctl_remove - remove the control from the card and release it 367 * @card: the card instance 368 * @kcontrol: the control instance to remove 369 * 370 * Removes the control from the card and then releases the instance. 371 * You don't need to call snd_ctl_free_one(). You must be in 372 * the write lock - down_write(&card->controls_rwsem). 373 * 374 * Returns 0 if successful, or a negative error code on failure. 375 */ 376 int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) 377 { 378 struct snd_ctl_elem_id id; 379 unsigned int idx; 380 381 if (snd_BUG_ON(!card || !kcontrol)) 382 return -EINVAL; 383 list_del(&kcontrol->list); 384 card->controls_count -= kcontrol->count; 385 id = kcontrol->id; 386 for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) 387 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); 388 snd_ctl_free_one(kcontrol); 389 return 0; 390 } 391 392 EXPORT_SYMBOL(snd_ctl_remove); 393 394 /** 395 * snd_ctl_remove_id - remove the control of the given id and release it 396 * @card: the card instance 397 * @id: the control id to remove 398 * 399 * Finds the control instance with the given id, removes it from the 400 * card list and releases it. 401 * 402 * Returns 0 if successful, or a negative error code on failure. 403 */ 404 int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) 405 { 406 struct snd_kcontrol *kctl; 407 int ret; 408 409 down_write(&card->controls_rwsem); 410 kctl = snd_ctl_find_id(card, id); 411 if (kctl == NULL) { 412 up_write(&card->controls_rwsem); 413 return -ENOENT; 414 } 415 ret = snd_ctl_remove(card, kctl); 416 up_write(&card->controls_rwsem); 417 return ret; 418 } 419 420 EXPORT_SYMBOL(snd_ctl_remove_id); 421 422 /** 423 * snd_ctl_remove_user_ctl - remove and release the unlocked user control 424 * @file: active control handle 425 * @id: the control id to remove 426 * 427 * Finds the control instance with the given id, removes it from the 428 * card list and releases it. 429 * 430 * Returns 0 if successful, or a negative error code on failure. 431 */ 432 static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, 433 struct snd_ctl_elem_id *id) 434 { 435 struct snd_card *card = file->card; 436 struct snd_kcontrol *kctl; 437 int idx, ret; 438 439 down_write(&card->controls_rwsem); 440 kctl = snd_ctl_find_id(card, id); 441 if (kctl == NULL) { 442 ret = -ENOENT; 443 goto error; 444 } 445 if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { 446 ret = -EINVAL; 447 goto error; 448 } 449 for (idx = 0; idx < kctl->count; idx++) 450 if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { 451 ret = -EBUSY; 452 goto error; 453 } 454 ret = snd_ctl_remove(card, kctl); 455 if (ret < 0) 456 goto error; 457 card->user_ctl_count--; 458 error: 459 up_write(&card->controls_rwsem); 460 return ret; 461 } 462 463 /** 464 * snd_ctl_rename_id - replace the id of a control on the card 465 * @card: the card instance 466 * @src_id: the old id 467 * @dst_id: the new id 468 * 469 * Finds the control with the old id from the card, and replaces the 470 * id with the new one. 471 * 472 * Returns zero if successful, or a negative error code on failure. 473 */ 474 int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, 475 struct snd_ctl_elem_id *dst_id) 476 { 477 struct snd_kcontrol *kctl; 478 479 down_write(&card->controls_rwsem); 480 kctl = snd_ctl_find_id(card, src_id); 481 if (kctl == NULL) { 482 up_write(&card->controls_rwsem); 483 return -ENOENT; 484 } 485 kctl->id = *dst_id; 486 kctl->id.numid = card->last_numid + 1; 487 card->last_numid += kctl->count; 488 up_write(&card->controls_rwsem); 489 return 0; 490 } 491 492 EXPORT_SYMBOL(snd_ctl_rename_id); 493 494 /** 495 * snd_ctl_find_numid - find the control instance with the given number-id 496 * @card: the card instance 497 * @numid: the number-id to search 498 * 499 * Finds the control instance with the given number-id from the card. 500 * 501 * Returns the pointer of the instance if found, or NULL if not. 502 * 503 * The caller must down card->controls_rwsem before calling this function 504 * (if the race condition can happen). 505 */ 506 struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) 507 { 508 struct snd_kcontrol *kctl; 509 510 if (snd_BUG_ON(!card || !numid)) 511 return NULL; 512 list_for_each_entry(kctl, &card->controls, list) { 513 if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) 514 return kctl; 515 } 516 return NULL; 517 } 518 519 EXPORT_SYMBOL(snd_ctl_find_numid); 520 521 /** 522 * snd_ctl_find_id - find the control instance with the given id 523 * @card: the card instance 524 * @id: the id to search 525 * 526 * Finds the control instance with the given id from the card. 527 * 528 * Returns the pointer of the instance if found, or NULL if not. 529 * 530 * The caller must down card->controls_rwsem before calling this function 531 * (if the race condition can happen). 532 */ 533 struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, 534 struct snd_ctl_elem_id *id) 535 { 536 struct snd_kcontrol *kctl; 537 538 if (snd_BUG_ON(!card || !id)) 539 return NULL; 540 if (id->numid != 0) 541 return snd_ctl_find_numid(card, id->numid); 542 list_for_each_entry(kctl, &card->controls, list) { 543 if (kctl->id.iface != id->iface) 544 continue; 545 if (kctl->id.device != id->device) 546 continue; 547 if (kctl->id.subdevice != id->subdevice) 548 continue; 549 if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) 550 continue; 551 if (kctl->id.index > id->index) 552 continue; 553 if (kctl->id.index + kctl->count <= id->index) 554 continue; 555 return kctl; 556 } 557 return NULL; 558 } 559 560 EXPORT_SYMBOL(snd_ctl_find_id); 561 562 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, 563 unsigned int cmd, void __user *arg) 564 { 565 struct snd_ctl_card_info *info; 566 567 info = kzalloc(sizeof(*info), GFP_KERNEL); 568 if (! info) 569 return -ENOMEM; 570 down_read(&snd_ioctl_rwsem); 571 info->card = card->number; 572 strlcpy(info->id, card->id, sizeof(info->id)); 573 strlcpy(info->driver, card->driver, sizeof(info->driver)); 574 strlcpy(info->name, card->shortname, sizeof(info->name)); 575 strlcpy(info->longname, card->longname, sizeof(info->longname)); 576 strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); 577 strlcpy(info->components, card->components, sizeof(info->components)); 578 up_read(&snd_ioctl_rwsem); 579 if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { 580 kfree(info); 581 return -EFAULT; 582 } 583 kfree(info); 584 return 0; 585 } 586 587 static int snd_ctl_elem_list(struct snd_card *card, 588 struct snd_ctl_elem_list __user *_list) 589 { 590 struct list_head *plist; 591 struct snd_ctl_elem_list list; 592 struct snd_kcontrol *kctl; 593 struct snd_ctl_elem_id *dst, *id; 594 unsigned int offset, space, first, jidx; 595 596 if (copy_from_user(&list, _list, sizeof(list))) 597 return -EFAULT; 598 offset = list.offset; 599 space = list.space; 600 first = 0; 601 /* try limit maximum space */ 602 if (space > 16384) 603 return -ENOMEM; 604 if (space > 0) { 605 /* allocate temporary buffer for atomic operation */ 606 dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); 607 if (dst == NULL) 608 return -ENOMEM; 609 down_read(&card->controls_rwsem); 610 list.count = card->controls_count; 611 plist = card->controls.next; 612 while (plist != &card->controls) { 613 if (offset == 0) 614 break; 615 kctl = snd_kcontrol(plist); 616 if (offset < kctl->count) 617 break; 618 offset -= kctl->count; 619 plist = plist->next; 620 } 621 list.used = 0; 622 id = dst; 623 while (space > 0 && plist != &card->controls) { 624 kctl = snd_kcontrol(plist); 625 for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { 626 snd_ctl_build_ioff(id, kctl, jidx); 627 id++; 628 space--; 629 list.used++; 630 } 631 plist = plist->next; 632 offset = 0; 633 } 634 up_read(&card->controls_rwsem); 635 if (list.used > 0 && 636 copy_to_user(list.pids, dst, 637 list.used * sizeof(struct snd_ctl_elem_id))) { 638 vfree(dst); 639 return -EFAULT; 640 } 641 vfree(dst); 642 } else { 643 down_read(&card->controls_rwsem); 644 list.count = card->controls_count; 645 up_read(&card->controls_rwsem); 646 } 647 if (copy_to_user(_list, &list, sizeof(list))) 648 return -EFAULT; 649 return 0; 650 } 651 652 static int snd_ctl_elem_info(struct snd_ctl_file *ctl, 653 struct snd_ctl_elem_info *info) 654 { 655 struct snd_card *card = ctl->card; 656 struct snd_kcontrol *kctl; 657 struct snd_kcontrol_volatile *vd; 658 unsigned int index_offset; 659 int result; 660 661 down_read(&card->controls_rwsem); 662 kctl = snd_ctl_find_id(card, &info->id); 663 if (kctl == NULL) { 664 up_read(&card->controls_rwsem); 665 return -ENOENT; 666 } 667 #ifdef CONFIG_SND_DEBUG 668 info->access = 0; 669 #endif 670 result = kctl->info(kctl, info); 671 if (result >= 0) { 672 snd_BUG_ON(info->access); 673 index_offset = snd_ctl_get_ioff(kctl, &info->id); 674 vd = &kctl->vd[index_offset]; 675 snd_ctl_build_ioff(&info->id, kctl, index_offset); 676 info->access = vd->access; 677 if (vd->owner) { 678 info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; 679 if (vd->owner == ctl) 680 info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; 681 info->owner = pid_vnr(vd->owner->pid); 682 } else { 683 info->owner = -1; 684 } 685 } 686 up_read(&card->controls_rwsem); 687 return result; 688 } 689 690 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, 691 struct snd_ctl_elem_info __user *_info) 692 { 693 struct snd_ctl_elem_info info; 694 int result; 695 696 if (copy_from_user(&info, _info, sizeof(info))) 697 return -EFAULT; 698 snd_power_lock(ctl->card); 699 result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); 700 if (result >= 0) 701 result = snd_ctl_elem_info(ctl, &info); 702 snd_power_unlock(ctl->card); 703 if (result >= 0) 704 if (copy_to_user(_info, &info, sizeof(info))) 705 return -EFAULT; 706 return result; 707 } 708 709 static int snd_ctl_elem_read(struct snd_card *card, 710 struct snd_ctl_elem_value *control) 711 { 712 struct snd_kcontrol *kctl; 713 struct snd_kcontrol_volatile *vd; 714 unsigned int index_offset; 715 int result; 716 717 down_read(&card->controls_rwsem); 718 kctl = snd_ctl_find_id(card, &control->id); 719 if (kctl == NULL) { 720 result = -ENOENT; 721 } else { 722 index_offset = snd_ctl_get_ioff(kctl, &control->id); 723 vd = &kctl->vd[index_offset]; 724 if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && 725 kctl->get != NULL) { 726 snd_ctl_build_ioff(&control->id, kctl, index_offset); 727 result = kctl->get(kctl, control); 728 } else 729 result = -EPERM; 730 } 731 up_read(&card->controls_rwsem); 732 return result; 733 } 734 735 static int snd_ctl_elem_read_user(struct snd_card *card, 736 struct snd_ctl_elem_value __user *_control) 737 { 738 struct snd_ctl_elem_value *control; 739 int result; 740 741 control = memdup_user(_control, sizeof(*control)); 742 if (IS_ERR(control)) 743 return PTR_ERR(control); 744 745 snd_power_lock(card); 746 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 747 if (result >= 0) 748 result = snd_ctl_elem_read(card, control); 749 snd_power_unlock(card); 750 if (result >= 0) 751 if (copy_to_user(_control, control, sizeof(*control))) 752 result = -EFAULT; 753 kfree(control); 754 return result; 755 } 756 757 static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, 758 struct snd_ctl_elem_value *control) 759 { 760 struct snd_kcontrol *kctl; 761 struct snd_kcontrol_volatile *vd; 762 unsigned int index_offset; 763 int result; 764 765 down_read(&card->controls_rwsem); 766 kctl = snd_ctl_find_id(card, &control->id); 767 if (kctl == NULL) { 768 result = -ENOENT; 769 } else { 770 index_offset = snd_ctl_get_ioff(kctl, &control->id); 771 vd = &kctl->vd[index_offset]; 772 if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || 773 kctl->put == NULL || 774 (file && vd->owner && vd->owner != file)) { 775 result = -EPERM; 776 } else { 777 snd_ctl_build_ioff(&control->id, kctl, index_offset); 778 result = kctl->put(kctl, control); 779 } 780 if (result > 0) { 781 up_read(&card->controls_rwsem); 782 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 783 &control->id); 784 return 0; 785 } 786 } 787 up_read(&card->controls_rwsem); 788 return result; 789 } 790 791 static int snd_ctl_elem_write_user(struct snd_ctl_file *file, 792 struct snd_ctl_elem_value __user *_control) 793 { 794 struct snd_ctl_elem_value *control; 795 struct snd_card *card; 796 int result; 797 798 control = memdup_user(_control, sizeof(*control)); 799 if (IS_ERR(control)) 800 return PTR_ERR(control); 801 802 card = file->card; 803 snd_power_lock(card); 804 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 805 if (result >= 0) 806 result = snd_ctl_elem_write(card, file, control); 807 snd_power_unlock(card); 808 if (result >= 0) 809 if (copy_to_user(_control, control, sizeof(*control))) 810 result = -EFAULT; 811 kfree(control); 812 return result; 813 } 814 815 static int snd_ctl_elem_lock(struct snd_ctl_file *file, 816 struct snd_ctl_elem_id __user *_id) 817 { 818 struct snd_card *card = file->card; 819 struct snd_ctl_elem_id id; 820 struct snd_kcontrol *kctl; 821 struct snd_kcontrol_volatile *vd; 822 int result; 823 824 if (copy_from_user(&id, _id, sizeof(id))) 825 return -EFAULT; 826 down_write(&card->controls_rwsem); 827 kctl = snd_ctl_find_id(card, &id); 828 if (kctl == NULL) { 829 result = -ENOENT; 830 } else { 831 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; 832 if (vd->owner != NULL) 833 result = -EBUSY; 834 else { 835 vd->owner = file; 836 result = 0; 837 } 838 } 839 up_write(&card->controls_rwsem); 840 return result; 841 } 842 843 static int snd_ctl_elem_unlock(struct snd_ctl_file *file, 844 struct snd_ctl_elem_id __user *_id) 845 { 846 struct snd_card *card = file->card; 847 struct snd_ctl_elem_id id; 848 struct snd_kcontrol *kctl; 849 struct snd_kcontrol_volatile *vd; 850 int result; 851 852 if (copy_from_user(&id, _id, sizeof(id))) 853 return -EFAULT; 854 down_write(&card->controls_rwsem); 855 kctl = snd_ctl_find_id(card, &id); 856 if (kctl == NULL) { 857 result = -ENOENT; 858 } else { 859 vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; 860 if (vd->owner == NULL) 861 result = -EINVAL; 862 else if (vd->owner != file) 863 result = -EPERM; 864 else { 865 vd->owner = NULL; 866 result = 0; 867 } 868 } 869 up_write(&card->controls_rwsem); 870 return result; 871 } 872 873 struct user_element { 874 struct snd_ctl_elem_info info; 875 void *elem_data; /* element data */ 876 unsigned long elem_data_size; /* size of element data in bytes */ 877 void *tlv_data; /* TLV data */ 878 unsigned long tlv_data_size; /* TLV data size */ 879 void *priv_data; /* private data (like strings for enumerated type) */ 880 unsigned long priv_data_size; /* size of private data in bytes */ 881 }; 882 883 static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, 884 struct snd_ctl_elem_info *uinfo) 885 { 886 struct user_element *ue = kcontrol->private_data; 887 888 *uinfo = ue->info; 889 return 0; 890 } 891 892 static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, 893 struct snd_ctl_elem_value *ucontrol) 894 { 895 struct user_element *ue = kcontrol->private_data; 896 897 memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); 898 return 0; 899 } 900 901 static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, 902 struct snd_ctl_elem_value *ucontrol) 903 { 904 int change; 905 struct user_element *ue = kcontrol->private_data; 906 907 change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; 908 if (change) 909 memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); 910 return change; 911 } 912 913 static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, 914 int op_flag, 915 unsigned int size, 916 unsigned int __user *tlv) 917 { 918 struct user_element *ue = kcontrol->private_data; 919 int change = 0; 920 void *new_data; 921 922 if (op_flag > 0) { 923 if (size > 1024 * 128) /* sane value */ 924 return -EINVAL; 925 926 new_data = memdup_user(tlv, size); 927 if (IS_ERR(new_data)) 928 return PTR_ERR(new_data); 929 change = ue->tlv_data_size != size; 930 if (!change) 931 change = memcmp(ue->tlv_data, new_data, size); 932 kfree(ue->tlv_data); 933 ue->tlv_data = new_data; 934 ue->tlv_data_size = size; 935 } else { 936 if (! ue->tlv_data_size || ! ue->tlv_data) 937 return -ENXIO; 938 if (size < ue->tlv_data_size) 939 return -ENOSPC; 940 if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) 941 return -EFAULT; 942 } 943 return change; 944 } 945 946 static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) 947 { 948 struct user_element *ue = kcontrol->private_data; 949 if (ue->tlv_data) 950 kfree(ue->tlv_data); 951 kfree(ue); 952 } 953 954 static int snd_ctl_elem_add(struct snd_ctl_file *file, 955 struct snd_ctl_elem_info *info, int replace) 956 { 957 struct snd_card *card = file->card; 958 struct snd_kcontrol kctl, *_kctl; 959 unsigned int access; 960 long private_size; 961 struct user_element *ue; 962 int idx, err; 963 964 if (card->user_ctl_count >= MAX_USER_CONTROLS) 965 return -ENOMEM; 966 if (info->count < 1) 967 return -EINVAL; 968 access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : 969 (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| 970 SNDRV_CTL_ELEM_ACCESS_INACTIVE| 971 SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); 972 info->id.numid = 0; 973 memset(&kctl, 0, sizeof(kctl)); 974 down_write(&card->controls_rwsem); 975 _kctl = snd_ctl_find_id(card, &info->id); 976 err = 0; 977 if (_kctl) { 978 if (replace) 979 err = snd_ctl_remove(card, _kctl); 980 else 981 err = -EBUSY; 982 } else { 983 if (replace) 984 err = -ENOENT; 985 } 986 up_write(&card->controls_rwsem); 987 if (err < 0) 988 return err; 989 memcpy(&kctl.id, &info->id, sizeof(info->id)); 990 kctl.count = info->owner ? info->owner : 1; 991 access |= SNDRV_CTL_ELEM_ACCESS_USER; 992 kctl.info = snd_ctl_elem_user_info; 993 if (access & SNDRV_CTL_ELEM_ACCESS_READ) 994 kctl.get = snd_ctl_elem_user_get; 995 if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) 996 kctl.put = snd_ctl_elem_user_put; 997 if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { 998 kctl.tlv.c = snd_ctl_elem_user_tlv; 999 access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; 1000 } 1001 switch (info->type) { 1002 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: 1003 case SNDRV_CTL_ELEM_TYPE_INTEGER: 1004 private_size = sizeof(long); 1005 if (info->count > 128) 1006 return -EINVAL; 1007 break; 1008 case SNDRV_CTL_ELEM_TYPE_INTEGER64: 1009 private_size = sizeof(long long); 1010 if (info->count > 64) 1011 return -EINVAL; 1012 break; 1013 case SNDRV_CTL_ELEM_TYPE_BYTES: 1014 private_size = sizeof(unsigned char); 1015 if (info->count > 512) 1016 return -EINVAL; 1017 break; 1018 case SNDRV_CTL_ELEM_TYPE_IEC958: 1019 private_size = sizeof(struct snd_aes_iec958); 1020 if (info->count != 1) 1021 return -EINVAL; 1022 break; 1023 default: 1024 return -EINVAL; 1025 } 1026 private_size *= info->count; 1027 ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); 1028 if (ue == NULL) 1029 return -ENOMEM; 1030 ue->info = *info; 1031 ue->info.access = 0; 1032 ue->elem_data = (char *)ue + sizeof(*ue); 1033 ue->elem_data_size = private_size; 1034 kctl.private_free = snd_ctl_elem_user_free; 1035 _kctl = snd_ctl_new(&kctl, access); 1036 if (_kctl == NULL) { 1037 kfree(ue); 1038 return -ENOMEM; 1039 } 1040 _kctl->private_data = ue; 1041 for (idx = 0; idx < _kctl->count; idx++) 1042 _kctl->vd[idx].owner = file; 1043 err = snd_ctl_add(card, _kctl); 1044 if (err < 0) 1045 return err; 1046 1047 down_write(&card->controls_rwsem); 1048 card->user_ctl_count++; 1049 up_write(&card->controls_rwsem); 1050 1051 return 0; 1052 } 1053 1054 static int snd_ctl_elem_add_user(struct snd_ctl_file *file, 1055 struct snd_ctl_elem_info __user *_info, int replace) 1056 { 1057 struct snd_ctl_elem_info info; 1058 if (copy_from_user(&info, _info, sizeof(info))) 1059 return -EFAULT; 1060 return snd_ctl_elem_add(file, &info, replace); 1061 } 1062 1063 static int snd_ctl_elem_remove(struct snd_ctl_file *file, 1064 struct snd_ctl_elem_id __user *_id) 1065 { 1066 struct snd_ctl_elem_id id; 1067 1068 if (copy_from_user(&id, _id, sizeof(id))) 1069 return -EFAULT; 1070 return snd_ctl_remove_user_ctl(file, &id); 1071 } 1072 1073 static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) 1074 { 1075 int subscribe; 1076 if (get_user(subscribe, ptr)) 1077 return -EFAULT; 1078 if (subscribe < 0) { 1079 subscribe = file->subscribed; 1080 if (put_user(subscribe, ptr)) 1081 return -EFAULT; 1082 return 0; 1083 } 1084 if (subscribe) { 1085 file->subscribed = 1; 1086 return 0; 1087 } else if (file->subscribed) { 1088 snd_ctl_empty_read_queue(file); 1089 file->subscribed = 0; 1090 } 1091 return 0; 1092 } 1093 1094 static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, 1095 struct snd_ctl_tlv __user *_tlv, 1096 int op_flag) 1097 { 1098 struct snd_card *card = file->card; 1099 struct snd_ctl_tlv tlv; 1100 struct snd_kcontrol *kctl; 1101 struct snd_kcontrol_volatile *vd; 1102 unsigned int len; 1103 int err = 0; 1104 1105 if (copy_from_user(&tlv, _tlv, sizeof(tlv))) 1106 return -EFAULT; 1107 if (tlv.length < sizeof(unsigned int) * 2) 1108 return -EINVAL; 1109 down_read(&card->controls_rwsem); 1110 kctl = snd_ctl_find_numid(card, tlv.numid); 1111 if (kctl == NULL) { 1112 err = -ENOENT; 1113 goto __kctl_end; 1114 } 1115 if (kctl->tlv.p == NULL) { 1116 err = -ENXIO; 1117 goto __kctl_end; 1118 } 1119 vd = &kctl->vd[tlv.numid - kctl->id.numid]; 1120 if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || 1121 (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || 1122 (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { 1123 err = -ENXIO; 1124 goto __kctl_end; 1125 } 1126 if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { 1127 if (vd->owner != NULL && vd->owner != file) { 1128 err = -EPERM; 1129 goto __kctl_end; 1130 } 1131 err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); 1132 if (err > 0) { 1133 up_read(&card->controls_rwsem); 1134 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); 1135 return 0; 1136 } 1137 } else { 1138 if (op_flag) { 1139 err = -ENXIO; 1140 goto __kctl_end; 1141 } 1142 len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); 1143 if (tlv.length < len) { 1144 err = -ENOMEM; 1145 goto __kctl_end; 1146 } 1147 if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) 1148 err = -EFAULT; 1149 } 1150 __kctl_end: 1151 up_read(&card->controls_rwsem); 1152 return err; 1153 } 1154 1155 static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1156 { 1157 struct snd_ctl_file *ctl; 1158 struct snd_card *card; 1159 struct snd_kctl_ioctl *p; 1160 void __user *argp = (void __user *)arg; 1161 int __user *ip = argp; 1162 int err; 1163 1164 ctl = file->private_data; 1165 card = ctl->card; 1166 if (snd_BUG_ON(!card)) 1167 return -ENXIO; 1168 switch (cmd) { 1169 case SNDRV_CTL_IOCTL_PVERSION: 1170 return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; 1171 case SNDRV_CTL_IOCTL_CARD_INFO: 1172 return snd_ctl_card_info(card, ctl, cmd, argp); 1173 case SNDRV_CTL_IOCTL_ELEM_LIST: 1174 return snd_ctl_elem_list(card, argp); 1175 case SNDRV_CTL_IOCTL_ELEM_INFO: 1176 return snd_ctl_elem_info_user(ctl, argp); 1177 case SNDRV_CTL_IOCTL_ELEM_READ: 1178 return snd_ctl_elem_read_user(card, argp); 1179 case SNDRV_CTL_IOCTL_ELEM_WRITE: 1180 return snd_ctl_elem_write_user(ctl, argp); 1181 case SNDRV_CTL_IOCTL_ELEM_LOCK: 1182 return snd_ctl_elem_lock(ctl, argp); 1183 case SNDRV_CTL_IOCTL_ELEM_UNLOCK: 1184 return snd_ctl_elem_unlock(ctl, argp); 1185 case SNDRV_CTL_IOCTL_ELEM_ADD: 1186 return snd_ctl_elem_add_user(ctl, argp, 0); 1187 case SNDRV_CTL_IOCTL_ELEM_REPLACE: 1188 return snd_ctl_elem_add_user(ctl, argp, 1); 1189 case SNDRV_CTL_IOCTL_ELEM_REMOVE: 1190 return snd_ctl_elem_remove(ctl, argp); 1191 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: 1192 return snd_ctl_subscribe_events(ctl, ip); 1193 case SNDRV_CTL_IOCTL_TLV_READ: 1194 return snd_ctl_tlv_ioctl(ctl, argp, 0); 1195 case SNDRV_CTL_IOCTL_TLV_WRITE: 1196 return snd_ctl_tlv_ioctl(ctl, argp, 1); 1197 case SNDRV_CTL_IOCTL_TLV_COMMAND: 1198 return snd_ctl_tlv_ioctl(ctl, argp, -1); 1199 case SNDRV_CTL_IOCTL_POWER: 1200 return -ENOPROTOOPT; 1201 case SNDRV_CTL_IOCTL_POWER_STATE: 1202 #ifdef CONFIG_PM 1203 return put_user(card->power_state, ip) ? -EFAULT : 0; 1204 #else 1205 return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; 1206 #endif 1207 } 1208 down_read(&snd_ioctl_rwsem); 1209 list_for_each_entry(p, &snd_control_ioctls, list) { 1210 err = p->fioctl(card, ctl, cmd, arg); 1211 if (err != -ENOIOCTLCMD) { 1212 up_read(&snd_ioctl_rwsem); 1213 return err; 1214 } 1215 } 1216 up_read(&snd_ioctl_rwsem); 1217 snd_printdd("unknown ioctl = 0x%x\n", cmd); 1218 return -ENOTTY; 1219 } 1220 1221 static ssize_t snd_ctl_read(struct file *file, char __user *buffer, 1222 size_t count, loff_t * offset) 1223 { 1224 struct snd_ctl_file *ctl; 1225 int err = 0; 1226 ssize_t result = 0; 1227 1228 ctl = file->private_data; 1229 if (snd_BUG_ON(!ctl || !ctl->card)) 1230 return -ENXIO; 1231 if (!ctl->subscribed) 1232 return -EBADFD; 1233 if (count < sizeof(struct snd_ctl_event)) 1234 return -EINVAL; 1235 spin_lock_irq(&ctl->read_lock); 1236 while (count >= sizeof(struct snd_ctl_event)) { 1237 struct snd_ctl_event ev; 1238 struct snd_kctl_event *kev; 1239 while (list_empty(&ctl->events)) { 1240 wait_queue_t wait; 1241 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1242 err = -EAGAIN; 1243 goto __end_lock; 1244 } 1245 init_waitqueue_entry(&wait, current); 1246 add_wait_queue(&ctl->change_sleep, &wait); 1247 set_current_state(TASK_INTERRUPTIBLE); 1248 spin_unlock_irq(&ctl->read_lock); 1249 schedule(); 1250 remove_wait_queue(&ctl->change_sleep, &wait); 1251 if (signal_pending(current)) 1252 return -ERESTARTSYS; 1253 spin_lock_irq(&ctl->read_lock); 1254 } 1255 kev = snd_kctl_event(ctl->events.next); 1256 ev.type = SNDRV_CTL_EVENT_ELEM; 1257 ev.data.elem.mask = kev->mask; 1258 ev.data.elem.id = kev->id; 1259 list_del(&kev->list); 1260 spin_unlock_irq(&ctl->read_lock); 1261 kfree(kev); 1262 if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { 1263 err = -EFAULT; 1264 goto __end; 1265 } 1266 spin_lock_irq(&ctl->read_lock); 1267 buffer += sizeof(struct snd_ctl_event); 1268 count -= sizeof(struct snd_ctl_event); 1269 result += sizeof(struct snd_ctl_event); 1270 } 1271 __end_lock: 1272 spin_unlock_irq(&ctl->read_lock); 1273 __end: 1274 return result > 0 ? result : err; 1275 } 1276 1277 static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) 1278 { 1279 unsigned int mask; 1280 struct snd_ctl_file *ctl; 1281 1282 ctl = file->private_data; 1283 if (!ctl->subscribed) 1284 return 0; 1285 poll_wait(file, &ctl->change_sleep, wait); 1286 1287 mask = 0; 1288 if (!list_empty(&ctl->events)) 1289 mask |= POLLIN | POLLRDNORM; 1290 1291 return mask; 1292 } 1293 1294 /* 1295 * register the device-specific control-ioctls. 1296 * called from each device manager like pcm.c, hwdep.c, etc. 1297 */ 1298 static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) 1299 { 1300 struct snd_kctl_ioctl *pn; 1301 1302 pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); 1303 if (pn == NULL) 1304 return -ENOMEM; 1305 pn->fioctl = fcn; 1306 down_write(&snd_ioctl_rwsem); 1307 list_add_tail(&pn->list, lists); 1308 up_write(&snd_ioctl_rwsem); 1309 return 0; 1310 } 1311 1312 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) 1313 { 1314 return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); 1315 } 1316 1317 EXPORT_SYMBOL(snd_ctl_register_ioctl); 1318 1319 #ifdef CONFIG_COMPAT 1320 int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) 1321 { 1322 return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); 1323 } 1324 1325 EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); 1326 #endif 1327 1328 /* 1329 * de-register the device-specific control-ioctls. 1330 */ 1331 static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, 1332 struct list_head *lists) 1333 { 1334 struct snd_kctl_ioctl *p; 1335 1336 if (snd_BUG_ON(!fcn)) 1337 return -EINVAL; 1338 down_write(&snd_ioctl_rwsem); 1339 list_for_each_entry(p, lists, list) { 1340 if (p->fioctl == fcn) { 1341 list_del(&p->list); 1342 up_write(&snd_ioctl_rwsem); 1343 kfree(p); 1344 return 0; 1345 } 1346 } 1347 up_write(&snd_ioctl_rwsem); 1348 snd_BUG(); 1349 return -EINVAL; 1350 } 1351 1352 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) 1353 { 1354 return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); 1355 } 1356 1357 EXPORT_SYMBOL(snd_ctl_unregister_ioctl); 1358 1359 #ifdef CONFIG_COMPAT 1360 int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) 1361 { 1362 return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); 1363 } 1364 1365 EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); 1366 #endif 1367 1368 static int snd_ctl_fasync(int fd, struct file * file, int on) 1369 { 1370 struct snd_ctl_file *ctl; 1371 1372 ctl = file->private_data; 1373 return fasync_helper(fd, file, on, &ctl->fasync); 1374 } 1375 1376 /* 1377 * ioctl32 compat 1378 */ 1379 #ifdef CONFIG_COMPAT 1380 #include "control_compat.c" 1381 #else 1382 #define snd_ctl_ioctl_compat NULL 1383 #endif 1384 1385 /* 1386 * INIT PART 1387 */ 1388 1389 static const struct file_operations snd_ctl_f_ops = 1390 { 1391 .owner = THIS_MODULE, 1392 .read = snd_ctl_read, 1393 .open = snd_ctl_open, 1394 .release = snd_ctl_release, 1395 .llseek = no_llseek, 1396 .poll = snd_ctl_poll, 1397 .unlocked_ioctl = snd_ctl_ioctl, 1398 .compat_ioctl = snd_ctl_ioctl_compat, 1399 .fasync = snd_ctl_fasync, 1400 }; 1401 1402 /* 1403 * registration of the control device 1404 */ 1405 static int snd_ctl_dev_register(struct snd_device *device) 1406 { 1407 struct snd_card *card = device->device_data; 1408 int err, cardnum; 1409 char name[16]; 1410 1411 if (snd_BUG_ON(!card)) 1412 return -ENXIO; 1413 cardnum = card->number; 1414 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) 1415 return -ENXIO; 1416 sprintf(name, "controlC%i", cardnum); 1417 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, 1418 &snd_ctl_f_ops, card, name)) < 0) 1419 return err; 1420 return 0; 1421 } 1422 1423 /* 1424 * disconnection of the control device 1425 */ 1426 static int snd_ctl_dev_disconnect(struct snd_device *device) 1427 { 1428 struct snd_card *card = device->device_data; 1429 struct snd_ctl_file *ctl; 1430 int err, cardnum; 1431 1432 if (snd_BUG_ON(!card)) 1433 return -ENXIO; 1434 cardnum = card->number; 1435 if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) 1436 return -ENXIO; 1437 1438 read_lock(&card->ctl_files_rwlock); 1439 list_for_each_entry(ctl, &card->ctl_files, list) { 1440 wake_up(&ctl->change_sleep); 1441 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); 1442 } 1443 read_unlock(&card->ctl_files_rwlock); 1444 1445 if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, 1446 card, -1)) < 0) 1447 return err; 1448 return 0; 1449 } 1450 1451 /* 1452 * free all controls 1453 */ 1454 static int snd_ctl_dev_free(struct snd_device *device) 1455 { 1456 struct snd_card *card = device->device_data; 1457 struct snd_kcontrol *control; 1458 1459 down_write(&card->controls_rwsem); 1460 while (!list_empty(&card->controls)) { 1461 control = snd_kcontrol(card->controls.next); 1462 snd_ctl_remove(card, control); 1463 } 1464 up_write(&card->controls_rwsem); 1465 return 0; 1466 } 1467 1468 /* 1469 * create control core: 1470 * called from init.c 1471 */ 1472 int snd_ctl_create(struct snd_card *card) 1473 { 1474 static struct snd_device_ops ops = { 1475 .dev_free = snd_ctl_dev_free, 1476 .dev_register = snd_ctl_dev_register, 1477 .dev_disconnect = snd_ctl_dev_disconnect, 1478 }; 1479 1480 if (snd_BUG_ON(!card)) 1481 return -ENXIO; 1482 return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); 1483 } 1484 1485 /* 1486 * Frequently used control callbacks 1487 */ 1488 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, 1489 struct snd_ctl_elem_info *uinfo) 1490 { 1491 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 1492 uinfo->count = 1; 1493 uinfo->value.integer.min = 0; 1494 uinfo->value.integer.max = 1; 1495 return 0; 1496 } 1497 1498 EXPORT_SYMBOL(snd_ctl_boolean_mono_info); 1499 1500 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, 1501 struct snd_ctl_elem_info *uinfo) 1502 { 1503 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 1504 uinfo->count = 2; 1505 uinfo->value.integer.min = 0; 1506 uinfo->value.integer.max = 1; 1507 return 0; 1508 } 1509 1510 EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); 1511