1 /* 2 * Initialization routines 3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> 23 #include <linux/init.h> 24 #include <linux/sched.h> 25 #include <linux/file.h> 26 #include <linux/slab.h> 27 #include <linux/time.h> 28 #include <linux/ctype.h> 29 #include <linux/pci.h> 30 #include <linux/pm.h> 31 #include <linux/platform_device.h> 32 33 #include <sound/core.h> 34 #include <sound/control.h> 35 #include <sound/info.h> 36 37 struct snd_shutdown_f_ops { 38 struct file_operations f_ops; 39 struct snd_shutdown_f_ops *next; 40 }; 41 42 unsigned int snd_cards_lock = 0; /* locked for registering/using */ 43 snd_card_t *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL}; 44 DEFINE_RWLOCK(snd_card_rwlock); 45 46 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) 47 int (*snd_mixer_oss_notify_callback)(snd_card_t *card, int free_flag); 48 #endif 49 50 static void snd_card_id_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 51 { 52 snd_iprintf(buffer, "%s\n", entry->card->id); 53 } 54 55 static void snd_card_free_thread(void * __card); 56 57 /** 58 * snd_card_new - create and initialize a soundcard structure 59 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] 60 * @xid: card identification (ASCII string) 61 * @module: top level module for locking 62 * @extra_size: allocate this extra size after the main soundcard structure 63 * 64 * Creates and initializes a soundcard structure. 65 * 66 * Returns kmallocated snd_card_t structure. Creates the ALSA control interface 67 * (which is blocked until snd_card_register function is called). 68 */ 69 snd_card_t *snd_card_new(int idx, const char *xid, 70 struct module *module, int extra_size) 71 { 72 snd_card_t *card; 73 int err; 74 75 if (extra_size < 0) 76 extra_size = 0; 77 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL); 78 if (card == NULL) 79 return NULL; 80 if (xid) { 81 if (!snd_info_check_reserved_words(xid)) 82 goto __error; 83 strlcpy(card->id, xid, sizeof(card->id)); 84 } 85 err = 0; 86 write_lock(&snd_card_rwlock); 87 if (idx < 0) { 88 int idx2; 89 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) 90 if (~snd_cards_lock & idx & 1<<idx2) { 91 idx = idx2; 92 if (idx >= snd_ecards_limit) 93 snd_ecards_limit = idx + 1; 94 break; 95 } 96 } else if (idx < snd_ecards_limit) { 97 if (snd_cards_lock & (1 << idx)) 98 err = -ENODEV; /* invalid */ 99 } else if (idx < SNDRV_CARDS) 100 snd_ecards_limit = idx + 1; /* increase the limit */ 101 else 102 err = -ENODEV; 103 if (idx < 0 || err < 0) { 104 write_unlock(&snd_card_rwlock); 105 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); 106 goto __error; 107 } 108 snd_cards_lock |= 1 << idx; /* lock it */ 109 write_unlock(&snd_card_rwlock); 110 card->number = idx; 111 card->module = module; 112 INIT_LIST_HEAD(&card->devices); 113 init_rwsem(&card->controls_rwsem); 114 rwlock_init(&card->ctl_files_rwlock); 115 INIT_LIST_HEAD(&card->controls); 116 INIT_LIST_HEAD(&card->ctl_files); 117 spin_lock_init(&card->files_lock); 118 init_waitqueue_head(&card->shutdown_sleep); 119 INIT_WORK(&card->free_workq, snd_card_free_thread, card); 120 #ifdef CONFIG_PM 121 init_MUTEX(&card->power_lock); 122 init_waitqueue_head(&card->power_sleep); 123 #endif 124 /* the control interface cannot be accessed from the user space until */ 125 /* snd_cards_bitmask and snd_cards are set with snd_card_register */ 126 if ((err = snd_ctl_create(card)) < 0) { 127 snd_printd("unable to register control minors\n"); 128 goto __error; 129 } 130 if ((err = snd_info_card_create(card)) < 0) { 131 snd_printd("unable to create card info\n"); 132 goto __error_ctl; 133 } 134 if (extra_size > 0) 135 card->private_data = (char *)card + sizeof(snd_card_t); 136 return card; 137 138 __error_ctl: 139 snd_device_free_all(card, SNDRV_DEV_CMD_PRE); 140 __error: 141 kfree(card); 142 return NULL; 143 } 144 145 static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) 146 { 147 return POLLERR | POLLNVAL; 148 } 149 150 /** 151 * snd_card_disconnect - disconnect all APIs from the file-operations (user space) 152 * @card: soundcard structure 153 * 154 * Disconnects all APIs from the file-operations (user space). 155 * 156 * Returns zero, otherwise a negative error code. 157 * 158 * Note: The current implementation replaces all active file->f_op with special 159 * dummy file operations (they do nothing except release). 160 */ 161 int snd_card_disconnect(snd_card_t * card) 162 { 163 struct snd_monitor_file *mfile; 164 struct file *file; 165 struct snd_shutdown_f_ops *s_f_ops; 166 struct file_operations *f_ops, *old_f_ops; 167 int err; 168 169 spin_lock(&card->files_lock); 170 if (card->shutdown) { 171 spin_unlock(&card->files_lock); 172 return 0; 173 } 174 card->shutdown = 1; 175 spin_unlock(&card->files_lock); 176 177 /* phase 1: disable fops (user space) operations for ALSA API */ 178 write_lock(&snd_card_rwlock); 179 snd_cards[card->number] = NULL; 180 write_unlock(&snd_card_rwlock); 181 182 /* phase 2: replace file->f_op with special dummy operations */ 183 184 spin_lock(&card->files_lock); 185 mfile = card->files; 186 while (mfile) { 187 file = mfile->file; 188 189 /* it's critical part, use endless loop */ 190 /* we have no room to fail */ 191 s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); 192 if (s_f_ops == NULL) 193 panic("Atomic allocation failed for snd_shutdown_f_ops!"); 194 195 f_ops = &s_f_ops->f_ops; 196 197 memset(f_ops, 0, sizeof(*f_ops)); 198 f_ops->owner = file->f_op->owner; 199 f_ops->release = file->f_op->release; 200 f_ops->poll = snd_disconnect_poll; 201 202 s_f_ops->next = card->s_f_ops; 203 card->s_f_ops = s_f_ops; 204 205 f_ops = fops_get(f_ops); 206 207 old_f_ops = file->f_op; 208 file->f_op = f_ops; /* must be atomic */ 209 fops_put(old_f_ops); 210 211 mfile = mfile->next; 212 } 213 spin_unlock(&card->files_lock); 214 215 /* phase 3: notify all connected devices about disconnection */ 216 /* at this point, they cannot respond to any calls except release() */ 217 218 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) 219 if (snd_mixer_oss_notify_callback) 220 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); 221 #endif 222 223 /* notify all devices that we are disconnected */ 224 err = snd_device_disconnect_all(card); 225 if (err < 0) 226 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); 227 228 return 0; 229 } 230 231 #ifdef CONFIG_SND_GENERIC_DRIVER 232 static void snd_generic_device_unregister(snd_card_t *card); 233 #else 234 #define snd_generic_device_unregister(x) /*NOP*/ 235 #endif 236 237 /** 238 * snd_card_free - frees given soundcard structure 239 * @card: soundcard structure 240 * 241 * This function releases the soundcard structure and the all assigned 242 * devices automatically. That is, you don't have to release the devices 243 * by yourself. 244 * 245 * Returns zero. Frees all associated devices and frees the control 246 * interface associated to given soundcard. 247 */ 248 int snd_card_free(snd_card_t * card) 249 { 250 struct snd_shutdown_f_ops *s_f_ops; 251 252 if (card == NULL) 253 return -EINVAL; 254 write_lock(&snd_card_rwlock); 255 snd_cards[card->number] = NULL; 256 write_unlock(&snd_card_rwlock); 257 258 #ifdef CONFIG_PM 259 wake_up(&card->power_sleep); 260 #endif 261 /* wait, until all devices are ready for the free operation */ 262 wait_event(card->shutdown_sleep, card->files == NULL); 263 264 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) 265 if (snd_mixer_oss_notify_callback) 266 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); 267 #endif 268 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { 269 snd_printk(KERN_ERR "unable to free all devices (pre)\n"); 270 /* Fatal, but this situation should never occur */ 271 } 272 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { 273 snd_printk(KERN_ERR "unable to free all devices (normal)\n"); 274 /* Fatal, but this situation should never occur */ 275 } 276 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { 277 snd_printk(KERN_ERR "unable to free all devices (post)\n"); 278 /* Fatal, but this situation should never occur */ 279 } 280 if (card->private_free) 281 card->private_free(card); 282 if (card->proc_id) 283 snd_info_unregister(card->proc_id); 284 if (snd_info_card_free(card) < 0) { 285 snd_printk(KERN_WARNING "unable to free card info\n"); 286 /* Not fatal error */ 287 } 288 snd_generic_device_unregister(card); 289 while (card->s_f_ops) { 290 s_f_ops = card->s_f_ops; 291 card->s_f_ops = s_f_ops->next; 292 kfree(s_f_ops); 293 } 294 write_lock(&snd_card_rwlock); 295 snd_cards_lock &= ~(1 << card->number); 296 write_unlock(&snd_card_rwlock); 297 kfree(card); 298 return 0; 299 } 300 301 static void snd_card_free_thread(void * __card) 302 { 303 snd_card_t *card = __card; 304 struct module * module = card->module; 305 306 if (!try_module_get(module)) { 307 snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); 308 module = NULL; 309 } 310 311 snd_card_free(card); 312 313 module_put(module); 314 } 315 316 /** 317 * snd_card_free_in_thread - call snd_card_free() in thread 318 * @card: soundcard structure 319 * 320 * This function schedules the call of snd_card_free() function in a 321 * work queue. When all devices are released (non-busy), the work 322 * is woken up and calls snd_card_free(). 323 * 324 * When a card can be disconnected at any time by hotplug service, 325 * this function should be used in disconnect (or detach) callback 326 * instead of calling snd_card_free() directly. 327 * 328 * Returns - zero otherwise a negative error code if the start of thread failed. 329 */ 330 int snd_card_free_in_thread(snd_card_t * card) 331 { 332 if (card->files == NULL) { 333 snd_card_free(card); 334 return 0; 335 } 336 337 if (schedule_work(&card->free_workq)) 338 return 0; 339 340 snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); 341 /* try to free the structure immediately */ 342 snd_card_free(card); 343 return -EFAULT; 344 } 345 346 static void choose_default_id(snd_card_t * card) 347 { 348 int i, len, idx_flag = 0, loops = 8; 349 char *id, *spos; 350 351 id = spos = card->shortname; 352 while (*id != '\0') { 353 if (*id == ' ') 354 spos = id + 1; 355 id++; 356 } 357 id = card->id; 358 while (*spos != '\0' && !isalnum(*spos)) 359 spos++; 360 if (isdigit(*spos)) 361 *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; 362 while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { 363 if (isalnum(*spos)) 364 *id++ = *spos; 365 spos++; 366 } 367 *id = '\0'; 368 369 id = card->id; 370 371 if (*id == '\0') 372 strcpy(id, "default"); 373 374 while (1) { 375 if (loops-- == 0) { 376 snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); 377 strcpy(card->id, card->proc_root->name); 378 return; 379 } 380 if (!snd_info_check_reserved_words(id)) 381 goto __change; 382 for (i = 0; i < snd_ecards_limit; i++) { 383 if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) 384 goto __change; 385 } 386 break; 387 388 __change: 389 len = strlen(id); 390 if (idx_flag) 391 id[len-1]++; 392 else if ((size_t)len <= sizeof(card->id) - 3) { 393 strcat(id, "_1"); 394 idx_flag++; 395 } else { 396 spos = id + len - 2; 397 if ((size_t)len <= sizeof(card->id) - 2) 398 spos++; 399 *spos++ = '_'; 400 *spos++ = '1'; 401 *spos++ = '\0'; 402 idx_flag++; 403 } 404 } 405 } 406 407 /** 408 * snd_card_register - register the soundcard 409 * @card: soundcard structure 410 * 411 * This function registers all the devices assigned to the soundcard. 412 * Until calling this, the ALSA control interface is blocked from the 413 * external accesses. Thus, you should call this function at the end 414 * of the initialization of the card. 415 * 416 * Returns zero otherwise a negative error code if the registrain failed. 417 */ 418 int snd_card_register(snd_card_t * card) 419 { 420 int err; 421 snd_info_entry_t *entry; 422 423 snd_runtime_check(card != NULL, return -EINVAL); 424 if ((err = snd_device_register_all(card)) < 0) 425 return err; 426 write_lock(&snd_card_rwlock); 427 if (snd_cards[card->number]) { 428 /* already registered */ 429 write_unlock(&snd_card_rwlock); 430 return 0; 431 } 432 if (card->id[0] == '\0') 433 choose_default_id(card); 434 snd_cards[card->number] = card; 435 write_unlock(&snd_card_rwlock); 436 if ((err = snd_info_card_register(card)) < 0) { 437 snd_printd("unable to create card info\n"); 438 goto __skip_info; 439 } 440 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { 441 snd_printd("unable to create card entry\n"); 442 goto __skip_info; 443 } 444 entry->c.text.read_size = PAGE_SIZE; 445 entry->c.text.read = snd_card_id_read; 446 if (snd_info_register(entry) < 0) { 447 snd_info_free_entry(entry); 448 entry = NULL; 449 } 450 card->proc_id = entry; 451 __skip_info: 452 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) 453 if (snd_mixer_oss_notify_callback) 454 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); 455 #endif 456 return 0; 457 } 458 459 static snd_info_entry_t *snd_card_info_entry = NULL; 460 461 static void snd_card_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 462 { 463 int idx, count; 464 snd_card_t *card; 465 466 for (idx = count = 0; idx < SNDRV_CARDS; idx++) { 467 read_lock(&snd_card_rwlock); 468 if ((card = snd_cards[idx]) != NULL) { 469 count++; 470 snd_iprintf(buffer, "%i [%-15s]: %s - %s\n", 471 idx, 472 card->id, 473 card->driver, 474 card->shortname); 475 snd_iprintf(buffer, " %s\n", 476 card->longname); 477 } 478 read_unlock(&snd_card_rwlock); 479 } 480 if (!count) 481 snd_iprintf(buffer, "--- no soundcards ---\n"); 482 } 483 484 #if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) 485 486 void snd_card_info_read_oss(snd_info_buffer_t * buffer) 487 { 488 int idx, count; 489 snd_card_t *card; 490 491 for (idx = count = 0; idx < SNDRV_CARDS; idx++) { 492 read_lock(&snd_card_rwlock); 493 if ((card = snd_cards[idx]) != NULL) { 494 count++; 495 snd_iprintf(buffer, "%s\n", card->longname); 496 } 497 read_unlock(&snd_card_rwlock); 498 } 499 if (!count) { 500 snd_iprintf(buffer, "--- no soundcards ---\n"); 501 } 502 } 503 504 #endif 505 506 #ifdef MODULE 507 static snd_info_entry_t *snd_card_module_info_entry; 508 static void snd_card_module_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 509 { 510 int idx; 511 snd_card_t *card; 512 513 for (idx = 0; idx < SNDRV_CARDS; idx++) { 514 read_lock(&snd_card_rwlock); 515 if ((card = snd_cards[idx]) != NULL) 516 snd_iprintf(buffer, "%i %s\n", idx, card->module->name); 517 read_unlock(&snd_card_rwlock); 518 } 519 } 520 #endif 521 522 int __init snd_card_info_init(void) 523 { 524 snd_info_entry_t *entry; 525 526 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL); 527 snd_runtime_check(entry != NULL, return -ENOMEM); 528 entry->c.text.read_size = PAGE_SIZE; 529 entry->c.text.read = snd_card_info_read; 530 if (snd_info_register(entry) < 0) { 531 snd_info_free_entry(entry); 532 return -ENOMEM; 533 } 534 snd_card_info_entry = entry; 535 536 #ifdef MODULE 537 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL); 538 if (entry) { 539 entry->c.text.read_size = PAGE_SIZE; 540 entry->c.text.read = snd_card_module_info_read; 541 if (snd_info_register(entry) < 0) 542 snd_info_free_entry(entry); 543 else 544 snd_card_module_info_entry = entry; 545 } 546 #endif 547 548 return 0; 549 } 550 551 int __exit snd_card_info_done(void) 552 { 553 if (snd_card_info_entry) 554 snd_info_unregister(snd_card_info_entry); 555 #ifdef MODULE 556 if (snd_card_module_info_entry) 557 snd_info_unregister(snd_card_module_info_entry); 558 #endif 559 return 0; 560 } 561 562 /** 563 * snd_component_add - add a component string 564 * @card: soundcard structure 565 * @component: the component id string 566 * 567 * This function adds the component id string to the supported list. 568 * The component can be referred from the alsa-lib. 569 * 570 * Returns zero otherwise a negative error code. 571 */ 572 573 int snd_component_add(snd_card_t *card, const char *component) 574 { 575 char *ptr; 576 int len = strlen(component); 577 578 ptr = strstr(card->components, component); 579 if (ptr != NULL) { 580 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */ 581 return 1; 582 } 583 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) { 584 snd_BUG(); 585 return -ENOMEM; 586 } 587 if (card->components[0] != '\0') 588 strcat(card->components, " "); 589 strcat(card->components, component); 590 return 0; 591 } 592 593 /** 594 * snd_card_file_add - add the file to the file list of the card 595 * @card: soundcard structure 596 * @file: file pointer 597 * 598 * This function adds the file to the file linked-list of the card. 599 * This linked-list is used to keep tracking the connection state, 600 * and to avoid the release of busy resources by hotplug. 601 * 602 * Returns zero or a negative error code. 603 */ 604 int snd_card_file_add(snd_card_t *card, struct file *file) 605 { 606 struct snd_monitor_file *mfile; 607 608 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL); 609 if (mfile == NULL) 610 return -ENOMEM; 611 mfile->file = file; 612 mfile->next = NULL; 613 spin_lock(&card->files_lock); 614 if (card->shutdown) { 615 spin_unlock(&card->files_lock); 616 kfree(mfile); 617 return -ENODEV; 618 } 619 mfile->next = card->files; 620 card->files = mfile; 621 spin_unlock(&card->files_lock); 622 return 0; 623 } 624 625 /** 626 * snd_card_file_remove - remove the file from the file list 627 * @card: soundcard structure 628 * @file: file pointer 629 * 630 * This function removes the file formerly added to the card via 631 * snd_card_file_add() function. 632 * If all files are removed and the release of the card is 633 * scheduled, it will wake up the the thread to call snd_card_free() 634 * (see snd_card_free_in_thread() function). 635 * 636 * Returns zero or a negative error code. 637 */ 638 int snd_card_file_remove(snd_card_t *card, struct file *file) 639 { 640 struct snd_monitor_file *mfile, *pfile = NULL; 641 642 spin_lock(&card->files_lock); 643 mfile = card->files; 644 while (mfile) { 645 if (mfile->file == file) { 646 if (pfile) 647 pfile->next = mfile->next; 648 else 649 card->files = mfile->next; 650 break; 651 } 652 pfile = mfile; 653 mfile = mfile->next; 654 } 655 spin_unlock(&card->files_lock); 656 if (card->files == NULL) 657 wake_up(&card->shutdown_sleep); 658 if (!mfile) { 659 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); 660 return -ENOENT; 661 } 662 kfree(mfile); 663 return 0; 664 } 665 666 #ifdef CONFIG_SND_GENERIC_DRIVER 667 /* 668 * generic device without a proper bus using platform_device 669 * (e.g. ISA) 670 */ 671 struct snd_generic_device { 672 struct platform_device pdev; 673 snd_card_t *card; 674 }; 675 676 #define get_snd_generic_card(dev) container_of(to_platform_device(dev), struct snd_generic_device, pdev)->card 677 678 #define SND_GENERIC_NAME "snd_generic" 679 680 #ifdef CONFIG_PM 681 static int snd_generic_suspend(struct device *dev, pm_message_t state); 682 static int snd_generic_resume(struct device *dev); 683 #endif 684 685 /* initialized in sound.c */ 686 struct device_driver snd_generic_driver = { 687 .name = SND_GENERIC_NAME, 688 .bus = &platform_bus_type, 689 #ifdef CONFIG_PM 690 .suspend = snd_generic_suspend, 691 .resume = snd_generic_resume, 692 #endif 693 }; 694 695 void snd_generic_device_release(struct device *dev) 696 { 697 } 698 699 static int snd_generic_device_register(snd_card_t *card) 700 { 701 struct snd_generic_device *dev; 702 int err; 703 704 if (card->generic_dev) 705 return 0; /* already registered */ 706 707 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 708 if (! dev) { 709 snd_printk(KERN_ERR "can't allocate generic_device\n"); 710 return -ENOMEM; 711 } 712 713 dev->pdev.name = SND_GENERIC_NAME; 714 dev->pdev.id = card->number; 715 dev->pdev.dev.release = snd_generic_device_release; 716 dev->card = card; 717 if ((err = platform_device_register(&dev->pdev)) < 0) { 718 kfree(dev); 719 return err; 720 } 721 card->generic_dev = dev; 722 return 0; 723 } 724 725 static void snd_generic_device_unregister(snd_card_t *card) 726 { 727 struct snd_generic_device *dev = card->generic_dev; 728 if (dev) { 729 platform_device_unregister(&dev->pdev); 730 kfree(dev); 731 card->generic_dev = NULL; 732 } 733 } 734 735 /** 736 * snd_card_set_generic_dev - assign the generic device to the card 737 * @card: soundcard structure 738 * 739 * Assigns a generic device to the card. This function is provided as the 740 * last resort, for devices without any proper bus. Thus this won't override 741 * the device already assigned to the card. 742 * 743 * Returns zero if successful, or a negative error code. 744 */ 745 int snd_card_set_generic_dev(snd_card_t *card) 746 { 747 int err; 748 if ((err = snd_generic_device_register(card)) < 0) 749 return err; 750 if (! card->dev) 751 snd_card_set_dev(card, &card->generic_dev->pdev.dev); 752 return 0; 753 } 754 #endif /* CONFIG_SND_GENERIC_DRIVER */ 755 756 #ifdef CONFIG_PM 757 /** 758 * snd_power_wait - wait until the power-state is changed. 759 * @card: soundcard structure 760 * @power_state: expected power state 761 * @file: file structure for the O_NONBLOCK check (optional) 762 * 763 * Waits until the power-state is changed. 764 * 765 * Note: the power lock must be active before call. 766 */ 767 int snd_power_wait(snd_card_t *card, unsigned int power_state, struct file *file) 768 { 769 wait_queue_t wait; 770 int result = 0; 771 772 /* fastpath */ 773 if (snd_power_get_state(card) == power_state) 774 return 0; 775 init_waitqueue_entry(&wait, current); 776 add_wait_queue(&card->power_sleep, &wait); 777 while (1) { 778 if (card->shutdown) { 779 result = -ENODEV; 780 break; 781 } 782 if (snd_power_get_state(card) == power_state) 783 break; 784 #if 0 /* block all devices */ 785 if (file && (file->f_flags & O_NONBLOCK)) { 786 result = -EAGAIN; 787 break; 788 } 789 #endif 790 set_current_state(TASK_UNINTERRUPTIBLE); 791 snd_power_unlock(card); 792 schedule_timeout(30 * HZ); 793 snd_power_lock(card); 794 } 795 remove_wait_queue(&card->power_sleep, &wait); 796 return result; 797 } 798 799 /** 800 * snd_card_set_pm_callback - set the PCI power-management callbacks 801 * @card: soundcard structure 802 * @suspend: suspend callback function 803 * @resume: resume callback function 804 * @private_data: private data to pass to the callback functions 805 * 806 * Sets the power-management callback functions of the card. 807 * These callbacks are called from ALSA's common PCI suspend/resume 808 * handler and from the control API. 809 */ 810 int snd_card_set_pm_callback(snd_card_t *card, 811 int (*suspend)(snd_card_t *, pm_message_t), 812 int (*resume)(snd_card_t *), 813 void *private_data) 814 { 815 card->pm_suspend = suspend; 816 card->pm_resume = resume; 817 card->pm_private_data = private_data; 818 return 0; 819 } 820 821 #ifdef CONFIG_SND_GENERIC_DRIVER 822 /* suspend/resume callbacks for snd_generic platform device */ 823 static int snd_generic_suspend(struct device *dev, pm_message_t state) 824 { 825 snd_card_t *card; 826 827 card = get_snd_generic_card(dev); 828 if (card->power_state == SNDRV_CTL_POWER_D3hot) 829 return 0; 830 if (card->pm_suspend) 831 card->pm_suspend(card, PMSG_SUSPEND); 832 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 833 return 0; 834 } 835 836 static int snd_generic_resume(struct device *dev) 837 { 838 snd_card_t *card; 839 840 card = get_snd_generic_card(dev); 841 if (card->power_state == SNDRV_CTL_POWER_D0) 842 return 0; 843 if (card->pm_suspend) 844 card->pm_resume(card); 845 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 846 return 0; 847 } 848 849 /** 850 * snd_card_set_generic_pm_callback - set the generic power-management callbacks 851 * @card: soundcard structure 852 * @suspend: suspend callback function 853 * @resume: resume callback function 854 * @private_data: private data to pass to the callback functions 855 * 856 * Registers the power-management and sets the lowlevel callbacks for 857 * the given card. These callbacks are called from the ALSA's common 858 * PM handler and from the control API. 859 */ 860 int snd_card_set_generic_pm_callback(snd_card_t *card, 861 int (*suspend)(snd_card_t *, pm_message_t), 862 int (*resume)(snd_card_t *), 863 void *private_data) 864 { 865 int err; 866 if ((err = snd_generic_device_register(card)) < 0) 867 return err; 868 return snd_card_set_pm_callback(card, suspend, resume, private_data); 869 } 870 #endif /* CONFIG_SND_GENERIC_DRIVER */ 871 872 #ifdef CONFIG_PCI 873 int snd_card_pci_suspend(struct pci_dev *dev, pm_message_t state) 874 { 875 snd_card_t *card = pci_get_drvdata(dev); 876 int err; 877 if (! card || ! card->pm_suspend) 878 return 0; 879 if (card->power_state == SNDRV_CTL_POWER_D3hot) 880 return 0; 881 err = card->pm_suspend(card, PMSG_SUSPEND); 882 pci_save_state(dev); 883 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 884 return err; 885 } 886 887 int snd_card_pci_resume(struct pci_dev *dev) 888 { 889 snd_card_t *card = pci_get_drvdata(dev); 890 if (! card || ! card->pm_resume) 891 return 0; 892 if (card->power_state == SNDRV_CTL_POWER_D0) 893 return 0; 894 /* restore the PCI config space */ 895 pci_restore_state(dev); 896 card->pm_resume(card); 897 snd_power_change_state(card, SNDRV_CTL_POWER_D0); 898 return 0; 899 } 900 #endif 901 902 #endif /* CONFIG_PM */ 903