sound/usb/card.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   (Tentative) USB Audio Driver for ALSA
   4  *
   5  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   6  *
   7  *   Many codes borrowed from audio.c by
   8  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
   9  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  10  *
  11  *   Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
  12  *
  13  *  NOTES:
  14  *
  15  *   - the linked URBs would be preferred but not used so far because of
  16  *     the instability of unlinking.
  17  *   - type II is not supported properly.  there is no device which supports
  18  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  19  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  20  */
  21
  22
  23 #include <linux/bitops.h>
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/slab.h>
  27 #include <linux/string.h>
  28 #include <linux/ctype.h>
  29 #include <linux/usb.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/mutex.h>
  32 #include <linux/usb/audio.h>
  33 #include <linux/usb/audio-v2.h>
  34 #include <linux/usb/audio-v3.h>
  35 #include <linux/module.h>
  36
  37 #include <sound/control.h>
  38 #include <sound/core.h>
  39 #include <sound/info.h>
  40 #include <sound/pcm.h>
  41 #include <sound/pcm_params.h>
  42 #include <sound/initval.h>
  43
  44 #include "usbaudio.h"
  45 #include "card.h"
  46 #include "midi.h"
  47 #include "mixer.h"
  48 #include "proc.h"
  49 #include "quirks.h"
  50 #include "endpoint.h"
  51 #include "helper.h"
  52 #include "debug.h"
  53 #include "pcm.h"
  54 #include "format.h"
  55 #include "power.h"
  56 #include "stream.h"
  57 #include "media.h"
  58
  59 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  60 MODULE_DESCRIPTION("USB Audio");
  61 MODULE_LICENSE("GPL");
  62 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  63
  64
  65 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  66 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  67 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  68 /* Vendor/product IDs for this card */
  69 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  70 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  71 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  72 static bool ignore_ctl_error;
  73 static bool autoclock = true;
  74 static char *quirk_alias[SNDRV_CARDS];
  75 static char *delayed_register[SNDRV_CARDS];
  76
  77 bool snd_usb_use_vmalloc = true;
  78 bool snd_usb_skip_validation;
  79
  80 module_param_array(index, int, NULL, 0444);
  81 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  82 module_param_array(id, charp, NULL, 0444);
  83 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  84 module_param_array(enable, bool, NULL, 0444);
  85 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  86 module_param_array(vid, int, NULL, 0444);
  87 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  88 module_param_array(pid, int, NULL, 0444);
  89 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
  90 module_param_array(device_setup, int, NULL, 0444);
  91 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
  92 module_param(ignore_ctl_error, bool, 0444);
  93 MODULE_PARM_DESC(ignore_ctl_error,
  94                  "Ignore errors from USB controller for mixer interfaces.");
  95 module_param(autoclock, bool, 0444);
  96 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
  97 module_param_array(quirk_alias, charp, NULL, 0444);
  98 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
  99 module_param_array(delayed_register, charp, NULL, 0444);
 100 MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
 101 module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
 102 MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
 103 module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
 104 MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
 105
 106 /*
 107  * we keep the snd_usb_audio_t instances by ourselves for merging
 108  * the all interfaces on the same card as one sound device.
 109  */
 110
 111 static DEFINE_MUTEX(register_mutex);
 112 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 113 static struct usb_driver usb_audio_driver;
 114
 115 /*
 116  * disconnect streams
 117  * called from usb_audio_disconnect()
 118  */
 119 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
 120 {
 121         int idx;
 122         struct snd_usb_substream *subs;
 123
 124         for (idx = 0; idx < 2; idx++) {
 125                 subs = &as->substream[idx];
 126                 if (!subs->num_formats)
 127                         continue;
 128                 subs->interface = -1;
 129                 subs->data_endpoint = NULL;
 130                 subs->sync_endpoint = NULL;
 131         }
 132 }
 133
 134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 135 {
 136         struct usb_device *dev = chip->dev;
 137         struct usb_host_interface *alts;
 138         struct usb_interface_descriptor *altsd;
 139         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 140
 141         if (!iface) {
 142                 dev_err(&dev->dev, "%u:%d : does not exist\n",
 143                         ctrlif, interface);
 144                 return -EINVAL;
 145         }
 146
 147         alts = &iface->altsetting[0];
 148         altsd = get_iface_desc(alts);
 149
 150         /*
 151          * Android with both accessory and audio interfaces enabled gets the
 152          * interface numbers wrong.
 153          */
 154         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 155              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 156             interface == 0 &&
 157             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 158             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 159                 interface = 2;
 160                 iface = usb_ifnum_to_if(dev, interface);
 161                 if (!iface)
 162                         return -EINVAL;
 163                 alts = &iface->altsetting[0];
 164                 altsd = get_iface_desc(alts);
 165         }
 166
 167         if (usb_interface_claimed(iface)) {
 168                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
 169                         ctrlif, interface);
 170                 return -EINVAL;
 171         }
 172
 173         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 174              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 175             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 176                 int err = __snd_usbmidi_create(chip->card, iface,
 177                                              &chip->midi_list, NULL,
 178                                              chip->usb_id);
 179                 if (err < 0) {
 180                         dev_err(&dev->dev,
 181                                 "%u:%d: cannot create sequencer device\n",
 182                                 ctrlif, interface);
 183                         return -EINVAL;
 184                 }
 185                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 186
 187                 return 0;
 188         }
 189
 190         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 191              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 192             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 193                 dev_dbg(&dev->dev,
 194                         "%u:%d: skipping non-supported interface %d\n",
 195                         ctrlif, interface, altsd->bInterfaceClass);
 196                 /* skip non-supported classes */
 197                 return -EINVAL;
 198         }
 199
 200         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 201                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
 202                 return -EINVAL;
 203         }
 204
 205         if (! snd_usb_parse_audio_interface(chip, interface)) {
 206                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 207                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 208         }
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * parse audio control descriptor and create pcm/midi streams
 215  */
 216 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 217 {
 218         struct usb_device *dev = chip->dev;
 219         struct usb_host_interface *host_iface;
 220         struct usb_interface_descriptor *altsd;
 221         int i, protocol;
 222
 223         /* find audiocontrol interface */
 224         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 225         altsd = get_iface_desc(host_iface);
 226         protocol = altsd->bInterfaceProtocol;
 227
 228         switch (protocol) {
 229         default:
 230                 dev_warn(&dev->dev,
 231                          "unknown interface protocol %#02x, assuming v1\n",
 232                          protocol);
 233                 /* fall through */
 234
 235         case UAC_VERSION_1: {
 236                 struct uac1_ac_header_descriptor *h1;
 237                 int rest_bytes;
 238
 239                 h1 = snd_usb_find_csint_desc(host_iface->extra,
 240                                                          host_iface->extralen,
 241                                                          NULL, UAC_HEADER);
 242                 if (!h1 || h1->bLength < sizeof(*h1)) {
 243                         dev_err(&dev->dev, "cannot find UAC_HEADER\n");
 244                         return -EINVAL;
 245                 }
 246
 247                 rest_bytes = (void *)(host_iface->extra +
 248                                 host_iface->extralen) - (void *)h1;
 249
 250                 /* just to be sure -- this shouldn't hit at all */
 251                 if (rest_bytes <= 0) {
 252                         dev_err(&dev->dev, "invalid control header\n");
 253                         return -EINVAL;
 254                 }
 255
 256                 if (rest_bytes < sizeof(*h1)) {
 257                         dev_err(&dev->dev, "too short v1 buffer descriptor\n");
 258                         return -EINVAL;
 259                 }
 260
 261                 if (!h1->bInCollection) {
 262                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
 263                         return -EINVAL;
 264                 }
 265
 266                 if (rest_bytes < h1->bLength) {
 267                         dev_err(&dev->dev, "invalid buffer length (v1)\n");
 268                         return -EINVAL;
 269                 }
 270
 271                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 272                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
 273                         return -EINVAL;
 274                 }
 275
 276                 for (i = 0; i < h1->bInCollection; i++)
 277                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 278
 279                 break;
 280         }
 281
 282         case UAC_VERSION_2:
 283         case UAC_VERSION_3: {
 284                 struct usb_interface_assoc_descriptor *assoc =
 285                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 286
 287                 if (!assoc) {
 288                         /*
 289                          * Firmware writers cannot count to three.  So to find
 290                          * the IAD on the NuForce UDH-100, also check the next
 291                          * interface.
 292                          */
 293                         struct usb_interface *iface =
 294                                 usb_ifnum_to_if(dev, ctrlif + 1);
 295                         if (iface &&
 296                             iface->intf_assoc &&
 297                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 298                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 299                                 assoc = iface->intf_assoc;
 300                 }
 301
 302                 if (!assoc) {
 303                         dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
 304                         return -EINVAL;
 305                 }
 306
 307                 if (protocol == UAC_VERSION_3) {
 308                         int badd = assoc->bFunctionSubClass;
 309
 310                         if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
 311                             (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
 312                              badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
 313                                 dev_err(&dev->dev,
 314                                         "Unsupported UAC3 BADD profile\n");
 315                                 return -EINVAL;
 316                         }
 317
 318                         chip->badd_profile = badd;
 319                 }
 320
 321                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 322                         int intf = assoc->bFirstInterface + i;
 323
 324                         if (intf != ctrlif)
 325                                 snd_usb_create_stream(chip, ctrlif, intf);
 326                 }
 327
 328                 break;
 329         }
 330         }
 331
 332         return 0;
 333 }
 334
 335 /*
 336  * free the chip instance
 337  *
 338  * here we have to do not much, since pcm and controls are already freed
 339  *
 340  */
 341
 342 static void snd_usb_audio_free(struct snd_card *card)
 343 {
 344         struct snd_usb_audio *chip = card->private_data;
 345         struct snd_usb_endpoint *ep, *n;
 346
 347         list_for_each_entry_safe(ep, n, &chip->ep_list, list)
 348                 snd_usb_endpoint_free(ep);
 349
 350         mutex_destroy(&chip->mutex);
 351         if (!atomic_read(&chip->shutdown))
 352                 dev_set_drvdata(&chip->dev->dev, NULL);
 353 }
 354
 355 static void usb_audio_make_shortname(struct usb_device *dev,
 356                                      struct snd_usb_audio *chip,
 357                                      const struct snd_usb_audio_quirk *quirk)
 358 {
 359         struct snd_card *card = chip->card;
 360
 361         if (quirk && quirk->product_name && *quirk->product_name) {
 362                 strlcpy(card->shortname, quirk->product_name,
 363                         sizeof(card->shortname));
 364                 return;
 365         }
 366
 367         /* retrieve the device string as shortname */
 368         if (!dev->descriptor.iProduct ||
 369             usb_string(dev, dev->descriptor.iProduct,
 370                        card->shortname, sizeof(card->shortname)) <= 0) {
 371                 /* no name available from anywhere, so use ID */
 372                 sprintf(card->shortname, "USB Device %#04x:%#04x",
 373                         USB_ID_VENDOR(chip->usb_id),
 374                         USB_ID_PRODUCT(chip->usb_id));
 375         }
 376
 377         strim(card->shortname);
 378 }
 379
 380 static void usb_audio_make_longname(struct usb_device *dev,
 381                                     struct snd_usb_audio *chip,
 382                                     const struct snd_usb_audio_quirk *quirk)
 383 {
 384         struct snd_card *card = chip->card;
 385         int len;
 386
 387         /* shortcut - if any pre-defined string is given, use it */
 388         if (quirk && quirk->profile_name && *quirk->profile_name) {
 389                 strlcpy(card->longname, quirk->profile_name,
 390                         sizeof(card->longname));
 391                 return;
 392         }
 393
 394         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 395                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 396         } else {
 397                 /* retrieve the vendor and device strings as longname */
 398                 if (dev->descriptor.iManufacturer)
 399                         len = usb_string(dev, dev->descriptor.iManufacturer,
 400                                          card->longname, sizeof(card->longname));
 401                 else
 402                         len = 0;
 403                 /* we don't really care if there isn't any vendor string */
 404         }
 405         if (len > 0) {
 406                 strim(card->longname);
 407                 if (*card->longname)
 408                         strlcat(card->longname, " ", sizeof(card->longname));
 409         }
 410
 411         strlcat(card->longname, card->shortname, sizeof(card->longname));
 412
 413         len = strlcat(card->longname, " at ", sizeof(card->longname));
 414
 415         if (len < sizeof(card->longname))
 416                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 417
 418         switch (snd_usb_get_speed(dev)) {
 419         case USB_SPEED_LOW:
 420                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 421                 break;
 422         case USB_SPEED_FULL:
 423                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 424                 break;
 425         case USB_SPEED_HIGH:
 426                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 427                 break;
 428         case USB_SPEED_SUPER:
 429                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 430                 break;
 431         case USB_SPEED_SUPER_PLUS:
 432                 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
 433                 break;
 434         default:
 435                 break;
 436         }
 437 }
 438
 439 /*
 440  * create a chip instance and set its names.
 441  */
 442 static int snd_usb_audio_create(struct usb_interface *intf,
 443                                 struct usb_device *dev, int idx,
 444                                 const struct snd_usb_audio_quirk *quirk,
 445                                 unsigned int usb_id,
 446                                 struct snd_usb_audio **rchip)
 447 {
 448         struct snd_card *card;
 449         struct snd_usb_audio *chip;
 450         int err;
 451         char component[14];
 452
 453         *rchip = NULL;
 454
 455         switch (snd_usb_get_speed(dev)) {
 456         case USB_SPEED_LOW:
 457         case USB_SPEED_FULL:
 458         case USB_SPEED_HIGH:
 459         case USB_SPEED_WIRELESS:
 460         case USB_SPEED_SUPER:
 461         case USB_SPEED_SUPER_PLUS:
 462                 break;
 463         default:
 464                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
 465                 return -ENXIO;
 466         }
 467
 468         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
 469                            sizeof(*chip), &card);
 470         if (err < 0) {
 471                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
 472                 return err;
 473         }
 474
 475         chip = card->private_data;
 476         mutex_init(&chip->mutex);
 477         init_waitqueue_head(&chip->shutdown_wait);
 478         chip->index = idx;
 479         chip->dev = dev;
 480         chip->card = card;
 481         chip->setup = device_setup[idx];
 482         chip->autoclock = autoclock;
 483         atomic_set(&chip->active, 1); /* avoid autopm during probing */
 484         atomic_set(&chip->usage_count, 0);
 485         atomic_set(&chip->shutdown, 0);
 486
 487         chip->usb_id = usb_id;
 488         INIT_LIST_HEAD(&chip->pcm_list);
 489         INIT_LIST_HEAD(&chip->ep_list);
 490         INIT_LIST_HEAD(&chip->midi_list);
 491         INIT_LIST_HEAD(&chip->mixer_list);
 492
 493         card->private_free = snd_usb_audio_free;
 494
 495         strcpy(card->driver, "USB-Audio");
 496         sprintf(component, "USB%04x:%04x",
 497                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 498         snd_component_add(card, component);
 499
 500         usb_audio_make_shortname(dev, chip, quirk);
 501         usb_audio_make_longname(dev, chip, quirk);
 502
 503         snd_usb_audio_create_proc(chip);
 504
 505         *rchip = chip;
 506         return 0;
 507 }
 508
 509 /* look for a matching quirk alias id */
 510 static bool get_alias_id(struct usb_device *dev, unsigned int *id)
 511 {
 512         int i;
 513         unsigned int src, dst;
 514
 515         for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
 516                 if (!quirk_alias[i] ||
 517                     sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
 518                     src != *id)
 519                         continue;
 520                 dev_info(&dev->dev,
 521                          "device (%04x:%04x): applying quirk alias %04x:%04x\n",
 522                          USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
 523                          USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
 524                 *id = dst;
 525                 return true;
 526         }
 527
 528         return false;
 529 }
 530
 531 static bool check_delayed_register_option(struct snd_usb_audio *chip, int iface)
 532 {
 533         int i;
 534         unsigned int id, inum;
 535
 536         for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
 537                 if (delayed_register[i] &&
 538                     sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
 539                     id == chip->usb_id)
 540                         return inum != iface;
 541         }
 542
 543         return false;
 544 }
 545
 546 static const struct usb_device_id usb_audio_ids[]; /* defined below */
 547
 548 /* look for the corresponding quirk */
 549 static const struct snd_usb_audio_quirk *
 550 get_alias_quirk(struct usb_device *dev, unsigned int id)
 551 {
 552         const struct usb_device_id *p;
 553
 554         for (p = usb_audio_ids; p->match_flags; p++) {
 555                 /* FIXME: this checks only vendor:product pair in the list */
 556                 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
 557                     USB_DEVICE_ID_MATCH_DEVICE &&
 558                     p->idVendor == USB_ID_VENDOR(id) &&
 559                     p->idProduct == USB_ID_PRODUCT(id))
 560                         return (const struct snd_usb_audio_quirk *)p->driver_info;
 561         }
 562
 563         return NULL;
 564 }
 565
 566 /*
 567  * probe the active usb device
 568  *
 569  * note that this can be called multiple times per a device, when it
 570  * includes multiple audio control interfaces.
 571  *
 572  * thus we check the usb device pointer and creates the card instance
 573  * only at the first time.  the successive calls of this function will
 574  * append the pcm interface to the corresponding card.
 575  */
 576 static int usb_audio_probe(struct usb_interface *intf,
 577                            const struct usb_device_id *usb_id)
 578 {
 579         struct usb_device *dev = interface_to_usbdev(intf);
 580         const struct snd_usb_audio_quirk *quirk =
 581                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 582         struct snd_usb_audio *chip;
 583         int i, err;
 584         struct usb_host_interface *alts;
 585         int ifnum;
 586         u32 id;
 587
 588         alts = &intf->altsetting[0];
 589         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 590         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 591                     le16_to_cpu(dev->descriptor.idProduct));
 592         if (get_alias_id(dev, &id))
 593                 quirk = get_alias_quirk(dev, id);
 594         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 595                 return -ENXIO;
 596
 597         err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
 598         if (err < 0)
 599                 return err;
 600
 601         /*
 602          * found a config.  now register to ALSA
 603          */
 604
 605         /* check whether it's already registered */
 606         chip = NULL;
 607         mutex_lock(&register_mutex);
 608         for (i = 0; i < SNDRV_CARDS; i++) {
 609                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 610                         if (atomic_read(&usb_chip[i]->shutdown)) {
 611                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
 612                                 err = -EIO;
 613                                 goto __error;
 614                         }
 615                         chip = usb_chip[i];
 616                         atomic_inc(&chip->active); /* avoid autopm */
 617                         break;
 618                 }
 619         }
 620         if (! chip) {
 621                 err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
 622                 if (err < 0)
 623                         goto __error;
 624
 625                 /* it's a fresh one.
 626                  * now look for an empty slot and create a new card instance
 627                  */
 628                 for (i = 0; i < SNDRV_CARDS; i++)
 629                         if (!usb_chip[i] &&
 630                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 631                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 632                                 if (enable[i]) {
 633                                         err = snd_usb_audio_create(intf, dev, i, quirk,
 634                                                                    id, &chip);
 635                                         if (err < 0)
 636                                                 goto __error;
 637                                         chip->pm_intf = intf;
 638                                         break;
 639                                 } else if (vid[i] != -1 || pid[i] != -1) {
 640                                         dev_info(&dev->dev,
 641                                                  "device (%04x:%04x) is disabled\n",
 642                                                  USB_ID_VENDOR(id),
 643                                                  USB_ID_PRODUCT(id));
 644                                         err = -ENOENT;
 645                                         goto __error;
 646                                 }
 647                         }
 648                 if (!chip) {
 649                         dev_err(&dev->dev, "no available usb audio device\n");
 650                         err = -ENODEV;
 651                         goto __error;
 652                 }
 653         }
 654         dev_set_drvdata(&dev->dev, chip);
 655
 656         /*
 657          * For devices with more than one control interface, we assume the
 658          * first contains the audio controls. We might need a more specific
 659          * check here in the future.
 660          */
 661         if (!chip->ctrl_intf)
 662                 chip->ctrl_intf = alts;
 663
 664         chip->txfr_quirk = 0;
 665         err = 1; /* continue */
 666         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 667                 /* need some special handlings */
 668                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
 669                 if (err < 0)
 670                         goto __error;
 671         }
 672
 673         if (err > 0) {
 674                 /* create normal USB audio interfaces */
 675                 err = snd_usb_create_streams(chip, ifnum);
 676                 if (err < 0)
 677                         goto __error;
 678                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
 679                 if (err < 0)
 680                         goto __error;
 681         }
 682
 683         if (chip->need_delayed_register) {
 684                 dev_info(&dev->dev,
 685                          "Found post-registration device assignment: %08x:%02x\n",
 686                          chip->usb_id, ifnum);
 687                 chip->need_delayed_register = false; /* clear again */
 688         }
 689
 690         /* we are allowed to call snd_card_register() many times, but first
 691          * check to see if a device needs to skip it or do anything special
 692          */
 693         if (!snd_usb_registration_quirk(chip, ifnum) &&
 694             !check_delayed_register_option(chip, ifnum)) {
 695                 err = snd_card_register(chip->card);
 696                 if (err < 0)
 697                         goto __error;
 698         }
 699
 700         if (quirk && quirk->shares_media_device) {
 701                 /* don't want to fail when snd_media_device_create() fails */
 702                 snd_media_device_create(chip, intf);
 703         }
 704
 705         usb_chip[chip->index] = chip;
 706         chip->num_interfaces++;
 707         usb_set_intfdata(intf, chip);
 708         atomic_dec(&chip->active);
 709         mutex_unlock(&register_mutex);
 710         return 0;
 711
 712  __error:
 713         if (chip) {
 714                 /* chip->active is inside the chip->card object,
 715                  * decrement before memory is possibly returned.
 716                  */
 717                 atomic_dec(&chip->active);
 718                 if (!chip->num_interfaces)
 719                         snd_card_free(chip->card);
 720         }
 721         mutex_unlock(&register_mutex);
 722         return err;
 723 }
 724
 725 /*
 726  * we need to take care of counter, since disconnection can be called also
 727  * many times as well as usb_audio_probe().
 728  */
 729 static void usb_audio_disconnect(struct usb_interface *intf)
 730 {
 731         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 732         struct snd_card *card;
 733         struct list_head *p;
 734
 735         if (chip == (void *)-1L)
 736                 return;
 737
 738         card = chip->card;
 739
 740         mutex_lock(&register_mutex);
 741         if (atomic_inc_return(&chip->shutdown) == 1) {
 742                 struct snd_usb_stream *as;
 743                 struct snd_usb_endpoint *ep;
 744                 struct usb_mixer_interface *mixer;
 745
 746                 /* wait until all pending tasks done;
 747                  * they are protected by snd_usb_lock_shutdown()
 748                  */
 749                 wait_event(chip->shutdown_wait,
 750                            !atomic_read(&chip->usage_count));
 751                 snd_card_disconnect(card);
 752                 /* release the pcm resources */
 753                 list_for_each_entry(as, &chip->pcm_list, list) {
 754                         snd_usb_stream_disconnect(as);
 755                 }
 756                 /* release the endpoint resources */
 757                 list_for_each_entry(ep, &chip->ep_list, list) {
 758                         snd_usb_endpoint_release(ep);
 759                 }
 760                 /* release the midi resources */
 761                 list_for_each(p, &chip->midi_list) {
 762                         snd_usbmidi_disconnect(p);
 763                 }
 764                 /*
 765                  * Nice to check quirk && quirk->shares_media_device and
 766                  * then call the snd_media_device_delete(). Don't have
 767                  * access to the quirk here. snd_media_device_delete()
 768                  * accesses mixer_list
 769                  */
 770                 snd_media_device_delete(chip);
 771
 772                 /* release mixer resources */
 773                 list_for_each_entry(mixer, &chip->mixer_list, list) {
 774                         snd_usb_mixer_disconnect(mixer);
 775                 }
 776         }
 777
 778         chip->num_interfaces--;
 779         if (chip->num_interfaces <= 0) {
 780                 usb_chip[chip->index] = NULL;
 781                 mutex_unlock(&register_mutex);
 782                 snd_card_free_when_closed(card);
 783         } else {
 784                 mutex_unlock(&register_mutex);
 785         }
 786 }
 787
 788 /* lock the shutdown (disconnect) task and autoresume */
 789 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
 790 {
 791         int err;
 792
 793         atomic_inc(&chip->usage_count);
 794         if (atomic_read(&chip->shutdown)) {
 795                 err = -EIO;
 796                 goto error;
 797         }
 798         err = snd_usb_autoresume(chip);
 799         if (err < 0)
 800                 goto error;
 801         return 0;
 802
 803  error:
 804         if (atomic_dec_and_test(&chip->usage_count))
 805                 wake_up(&chip->shutdown_wait);
 806         return err;
 807 }
 808
 809 /* autosuspend and unlock the shutdown */
 810 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
 811 {
 812         snd_usb_autosuspend(chip);
 813         if (atomic_dec_and_test(&chip->usage_count))
 814                 wake_up(&chip->shutdown_wait);
 815 }
 816
 817 #ifdef CONFIG_PM
 818
 819 int snd_usb_autoresume(struct snd_usb_audio *chip)
 820 {
 821         if (atomic_read(&chip->shutdown))
 822                 return -EIO;
 823         if (atomic_inc_return(&chip->active) == 1)
 824                 return usb_autopm_get_interface(chip->pm_intf);
 825         return 0;
 826 }
 827
 828 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 829 {
 830         if (atomic_read(&chip->shutdown))
 831                 return;
 832         if (atomic_dec_and_test(&chip->active))
 833                 usb_autopm_put_interface(chip->pm_intf);
 834 }
 835
 836 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 837 {
 838         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 839         struct snd_usb_stream *as;
 840         struct usb_mixer_interface *mixer;
 841         struct list_head *p;
 842
 843         if (chip == (void *)-1L)
 844                 return 0;
 845
 846         chip->autosuspended = !!PMSG_IS_AUTO(message);
 847         if (!chip->autosuspended)
 848                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 849         if (!chip->num_suspended_intf++) {
 850                 list_for_each_entry(as, &chip->pcm_list, list) {
 851                         snd_usb_pcm_suspend(as);
 852                         as->substream[0].need_setup_ep =
 853                                 as->substream[1].need_setup_ep = true;
 854                 }
 855                 list_for_each(p, &chip->midi_list)
 856                         snd_usbmidi_suspend(p);
 857                 list_for_each_entry(mixer, &chip->mixer_list, list)
 858                         snd_usb_mixer_suspend(mixer);
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
 865 {
 866         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 867         struct snd_usb_stream *as;
 868         struct usb_mixer_interface *mixer;
 869         struct list_head *p;
 870         int err = 0;
 871
 872         if (chip == (void *)-1L)
 873                 return 0;
 874         if (--chip->num_suspended_intf)
 875                 return 0;
 876
 877         atomic_inc(&chip->active); /* avoid autopm */
 878
 879         list_for_each_entry(as, &chip->pcm_list, list) {
 880                 err = snd_usb_pcm_resume(as);
 881                 if (err < 0)
 882                         goto err_out;
 883         }
 884
 885         /*
 886          * ALSA leaves material resumption to user space
 887          * we just notify and restart the mixers
 888          */
 889         list_for_each_entry(mixer, &chip->mixer_list, list) {
 890                 err = snd_usb_mixer_resume(mixer, reset_resume);
 891                 if (err < 0)
 892                         goto err_out;
 893         }
 894
 895         list_for_each(p, &chip->midi_list) {
 896                 snd_usbmidi_resume(p);
 897         }
 898
 899         if (!chip->autosuspended)
 900                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 901         chip->autosuspended = 0;
 902
 903 err_out:
 904         atomic_dec(&chip->active); /* allow autopm after this point */
 905         return err;
 906 }
 907
 908 static int usb_audio_resume(struct usb_interface *intf)
 909 {
 910         return __usb_audio_resume(intf, false);
 911 }
 912
 913 static int usb_audio_reset_resume(struct usb_interface *intf)
 914 {
 915         return __usb_audio_resume(intf, true);
 916 }
 917 #else
 918 #define usb_audio_suspend       NULL
 919 #define usb_audio_resume        NULL
 920 #define usb_audio_reset_resume  NULL
 921 #endif          /* CONFIG_PM */
 922
 923 static const struct usb_device_id usb_audio_ids [] = {
 924 #include "quirks-table.h"
 925     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 926       .bInterfaceClass = USB_CLASS_AUDIO,
 927       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 928     { }                                         /* Terminating entry */
 929 };
 930 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 931
 932 /*
 933  * entry point for linux usb interface
 934  */
 935
 936 static struct usb_driver usb_audio_driver = {
 937         .name =         "snd-usb-audio",
 938         .probe =        usb_audio_probe,
 939         .disconnect =   usb_audio_disconnect,
 940         .suspend =      usb_audio_suspend,
 941         .resume =       usb_audio_resume,
 942         .reset_resume = usb_audio_reset_resume,
 943         .id_table =     usb_audio_ids,
 944         .supports_autosuspend = 1,
 945 };
 946
 947 module_usb_driver(usb_audio_driver);