sound/usb/card.c

   1 /*
   2  *   (Tentative) USB Audio Driver for ALSA
   3  *
   4  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   5  *
   6  *   Many codes borrowed from audio.c by
   7  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
   8  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
   9  *
  10  *
  11  *   This program is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU General Public License as published by
  13  *   the Free Software Foundation; either version 2 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This program is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with this program; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  24  *
  25  *
  26  *  NOTES:
  27  *
  28  *   - the linked URBs would be preferred but not used so far because of
  29  *     the instability of unlinking.
  30  *   - type II is not supported properly.  there is no device which supports
  31  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  32  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  33  */
  34
  35
  36 #include <linux/bitops.h>
  37 #include <linux/init.h>
  38 #include <linux/list.h>
  39 #include <linux/slab.h>
  40 #include <linux/string.h>
  41 #include <linux/ctype.h>
  42 #include <linux/usb.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/mutex.h>
  45 #include <linux/usb/audio.h>
  46 #include <linux/usb/audio-v2.h>
  47 #include <linux/module.h>
  48
  49 #include <sound/control.h>
  50 #include <sound/core.h>
  51 #include <sound/info.h>
  52 #include <sound/pcm.h>
  53 #include <sound/pcm_params.h>
  54 #include <sound/initval.h>
  55
  56 #include "usbaudio.h"
  57 #include "card.h"
  58 #include "midi.h"
  59 #include "mixer.h"
  60 #include "proc.h"
  61 #include "quirks.h"
  62 #include "endpoint.h"
  63 #include "helper.h"
  64 #include "debug.h"
  65 #include "pcm.h"
  66 #include "format.h"
  67 #include "power.h"
  68 #include "stream.h"
  69
  70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  71 MODULE_DESCRIPTION("USB Audio");
  72 MODULE_LICENSE("GPL");
  73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  74
  75
  76 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  77 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  78 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  79 /* Vendor/product IDs for this card */
  80 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  81 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  82 static int nrpacks = 8;         /* max. number of packets per urb */
  83 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  84 static bool ignore_ctl_error;
  85 static bool autoclock = true;
  86
  87 module_param_array(index, int, NULL, 0444);
  88 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  89 module_param_array(id, charp, NULL, 0444);
  90 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  91 module_param_array(enable, bool, NULL, 0444);
  92 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  93 module_param_array(vid, int, NULL, 0444);
  94 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  95 module_param_array(pid, int, NULL, 0444);
  96 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
  97 module_param(nrpacks, int, 0644);
  98 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
  99 module_param_array(device_setup, int, NULL, 0444);
 100 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 101 module_param(ignore_ctl_error, bool, 0444);
 102 MODULE_PARM_DESC(ignore_ctl_error,
 103                  "Ignore errors from USB controller for mixer interfaces.");
 104 module_param(autoclock, bool, 0444);
 105 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
 106
 107 /*
 108  * we keep the snd_usb_audio_t instances by ourselves for merging
 109  * the all interfaces on the same card as one sound device.
 110  */
 111
 112 static DEFINE_MUTEX(register_mutex);
 113 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 114 static struct usb_driver usb_audio_driver;
 115
 116 /*
 117  * disconnect streams
 118  * called from snd_usb_audio_disconnect()
 119  */
 120 static void snd_usb_stream_disconnect(struct list_head *head)
 121 {
 122         int idx;
 123         struct snd_usb_stream *as;
 124         struct snd_usb_substream *subs;
 125
 126         as = list_entry(head, struct snd_usb_stream, list);
 127         for (idx = 0; idx < 2; idx++) {
 128                 subs = &as->substream[idx];
 129                 if (!subs->num_formats)
 130                         continue;
 131                 subs->interface = -1;
 132                 subs->data_endpoint = NULL;
 133                 subs->sync_endpoint = NULL;
 134         }
 135 }
 136
 137 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 138 {
 139         struct usb_device *dev = chip->dev;
 140         struct usb_host_interface *alts;
 141         struct usb_interface_descriptor *altsd;
 142         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 143
 144         if (!iface) {
 145                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
 146                            dev->devnum, ctrlif, interface);
 147                 return -EINVAL;
 148         }
 149
 150         alts = &iface->altsetting[0];
 151         altsd = get_iface_desc(alts);
 152
 153         /*
 154          * Android with both accessory and audio interfaces enabled gets the
 155          * interface numbers wrong.
 156          */
 157         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 158              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 159             interface == 0 &&
 160             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 161             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 162                 interface = 2;
 163                 iface = usb_ifnum_to_if(dev, interface);
 164                 if (!iface)
 165                         return -EINVAL;
 166                 alts = &iface->altsetting[0];
 167                 altsd = get_iface_desc(alts);
 168         }
 169
 170         if (usb_interface_claimed(iface)) {
 171                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
 172                                                 dev->devnum, ctrlif, interface);
 173                 return -EINVAL;
 174         }
 175
 176         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 177              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 178             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 179                 int err = snd_usbmidi_create(chip->card, iface,
 180                                              &chip->midi_list, NULL);
 181                 if (err < 0) {
 182                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
 183                                                 dev->devnum, ctrlif, interface);
 184                         return -EINVAL;
 185                 }
 186                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 187
 188                 return 0;
 189         }
 190
 191         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 192              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 193             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 194                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
 195                                         dev->devnum, 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                 snd_printk(KERN_ERR "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                 return -EINVAL;
 209         }
 210
 211         return 0;
 212 }
 213
 214 /*
 215  * parse audio control descriptor and create pcm/midi streams
 216  */
 217 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 218 {
 219         struct usb_device *dev = chip->dev;
 220         struct usb_host_interface *host_iface;
 221         struct usb_interface_descriptor *altsd;
 222         void *control_header;
 223         int i, protocol;
 224
 225         /* find audiocontrol interface */
 226         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 227         control_header = snd_usb_find_csint_desc(host_iface->extra,
 228                                                  host_iface->extralen,
 229                                                  NULL, UAC_HEADER);
 230         altsd = get_iface_desc(host_iface);
 231         protocol = altsd->bInterfaceProtocol;
 232
 233         if (!control_header) {
 234                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
 235                 return -EINVAL;
 236         }
 237
 238         switch (protocol) {
 239         default:
 240                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
 241                             protocol);
 242                 /* fall through */
 243
 244         case UAC_VERSION_1: {
 245                 struct uac1_ac_header_descriptor *h1 = control_header;
 246
 247                 if (!h1->bInCollection) {
 248                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
 249                         return -EINVAL;
 250                 }
 251
 252                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 253                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
 254                         return -EINVAL;
 255                 }
 256
 257                 for (i = 0; i < h1->bInCollection; i++)
 258                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 259
 260                 break;
 261         }
 262
 263         case UAC_VERSION_2: {
 264                 struct usb_interface_assoc_descriptor *assoc =
 265                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 266
 267                 if (!assoc) {
 268                         /*
 269                          * Firmware writers cannot count to three.  So to find
 270                          * the IAD on the NuForce UDH-100, also check the next
 271                          * interface.
 272                          */
 273                         struct usb_interface *iface =
 274                                 usb_ifnum_to_if(dev, ctrlif + 1);
 275                         if (iface &&
 276                             iface->intf_assoc &&
 277                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 278                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 279                                 assoc = iface->intf_assoc;
 280                 }
 281
 282                 if (!assoc) {
 283                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
 284                         return -EINVAL;
 285                 }
 286
 287                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 288                         int intf = assoc->bFirstInterface + i;
 289
 290                         if (intf != ctrlif)
 291                                 snd_usb_create_stream(chip, ctrlif, intf);
 292                 }
 293
 294                 break;
 295         }
 296         }
 297
 298         return 0;
 299 }
 300
 301 /*
 302  * free the chip instance
 303  *
 304  * here we have to do not much, since pcm and controls are already freed
 305  *
 306  */
 307
 308 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 309 {
 310         mutex_destroy(&chip->mutex);
 311         kfree(chip);
 312         return 0;
 313 }
 314
 315 static int snd_usb_audio_dev_free(struct snd_device *device)
 316 {
 317         struct snd_usb_audio *chip = device->device_data;
 318         return snd_usb_audio_free(chip);
 319 }
 320
 321 static void remove_trailing_spaces(char *str)
 322 {
 323         char *p;
 324
 325         if (!*str)
 326                 return;
 327         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 328                 *p = 0;
 329 }
 330
 331 /*
 332  * create a chip instance and set its names.
 333  */
 334 static int snd_usb_audio_create(struct usb_device *dev, int idx,
 335                                 const struct snd_usb_audio_quirk *quirk,
 336                                 struct snd_usb_audio **rchip)
 337 {
 338         struct snd_card *card;
 339         struct snd_usb_audio *chip;
 340         int err, len;
 341         char component[14];
 342         static struct snd_device_ops ops = {
 343                 .dev_free =     snd_usb_audio_dev_free,
 344         };
 345
 346         *rchip = NULL;
 347
 348         switch (snd_usb_get_speed(dev)) {
 349         case USB_SPEED_LOW:
 350         case USB_SPEED_FULL:
 351         case USB_SPEED_HIGH:
 352         case USB_SPEED_SUPER:
 353                 break;
 354         default:
 355                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
 356                 return -ENXIO;
 357         }
 358
 359         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
 360         if (err < 0) {
 361                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
 362                 return err;
 363         }
 364
 365         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 366         if (! chip) {
 367                 snd_card_free(card);
 368                 return -ENOMEM;
 369         }
 370
 371         mutex_init(&chip->mutex);
 372         init_rwsem(&chip->shutdown_rwsem);
 373         chip->index = idx;
 374         chip->dev = dev;
 375         chip->card = card;
 376         chip->setup = device_setup[idx];
 377         chip->nrpacks = nrpacks;
 378         chip->autoclock = autoclock;
 379         chip->probing = 1;
 380
 381         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 382                               le16_to_cpu(dev->descriptor.idProduct));
 383         INIT_LIST_HEAD(&chip->pcm_list);
 384         INIT_LIST_HEAD(&chip->ep_list);
 385         INIT_LIST_HEAD(&chip->midi_list);
 386         INIT_LIST_HEAD(&chip->mixer_list);
 387
 388         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 389                 snd_usb_audio_free(chip);
 390                 snd_card_free(card);
 391                 return err;
 392         }
 393
 394         strcpy(card->driver, "USB-Audio");
 395         sprintf(component, "USB%04x:%04x",
 396                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 397         snd_component_add(card, component);
 398
 399         /* retrieve the device string as shortname */
 400         if (quirk && quirk->product_name && *quirk->product_name) {
 401                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 402         } else {
 403                 if (!dev->descriptor.iProduct ||
 404                     usb_string(dev, dev->descriptor.iProduct,
 405                     card->shortname, sizeof(card->shortname)) <= 0) {
 406                         /* no name available from anywhere, so use ID */
 407                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 408                                 USB_ID_VENDOR(chip->usb_id),
 409                                 USB_ID_PRODUCT(chip->usb_id));
 410                 }
 411         }
 412         remove_trailing_spaces(card->shortname);
 413
 414         /* retrieve the vendor and device strings as longname */
 415         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 416                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 417         } else {
 418                 if (dev->descriptor.iManufacturer)
 419                         len = usb_string(dev, dev->descriptor.iManufacturer,
 420                                          card->longname, sizeof(card->longname));
 421                 else
 422                         len = 0;
 423                 /* we don't really care if there isn't any vendor string */
 424         }
 425         if (len > 0) {
 426                 remove_trailing_spaces(card->longname);
 427                 if (*card->longname)
 428                         strlcat(card->longname, " ", sizeof(card->longname));
 429         }
 430
 431         strlcat(card->longname, card->shortname, sizeof(card->longname));
 432
 433         len = strlcat(card->longname, " at ", sizeof(card->longname));
 434
 435         if (len < sizeof(card->longname))
 436                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 437
 438         switch (snd_usb_get_speed(dev)) {
 439         case USB_SPEED_LOW:
 440                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 441                 break;
 442         case USB_SPEED_FULL:
 443                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 444                 break;
 445         case USB_SPEED_HIGH:
 446                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 447                 break;
 448         case USB_SPEED_SUPER:
 449                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 450                 break;
 451         default:
 452                 break;
 453         }
 454
 455         snd_usb_audio_create_proc(chip);
 456
 457         *rchip = chip;
 458         return 0;
 459 }
 460
 461 /*
 462  * probe the active usb device
 463  *
 464  * note that this can be called multiple times per a device, when it
 465  * includes multiple audio control interfaces.
 466  *
 467  * thus we check the usb device pointer and creates the card instance
 468  * only at the first time.  the successive calls of this function will
 469  * append the pcm interface to the corresponding card.
 470  */
 471 static struct snd_usb_audio *
 472 snd_usb_audio_probe(struct usb_device *dev,
 473                     struct usb_interface *intf,
 474                     const struct usb_device_id *usb_id)
 475 {
 476         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 477         int i, err;
 478         struct snd_usb_audio *chip;
 479         struct usb_host_interface *alts;
 480         int ifnum;
 481         u32 id;
 482
 483         alts = &intf->altsetting[0];
 484         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 485         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 486                     le16_to_cpu(dev->descriptor.idProduct));
 487         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 488                 goto __err_val;
 489
 490         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
 491                 goto __err_val;
 492
 493         /*
 494          * found a config.  now register to ALSA
 495          */
 496
 497         /* check whether it's already registered */
 498         chip = NULL;
 499         mutex_lock(&register_mutex);
 500         for (i = 0; i < SNDRV_CARDS; i++) {
 501                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 502                         if (usb_chip[i]->shutdown) {
 503                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
 504                                 goto __error;
 505                         }
 506                         chip = usb_chip[i];
 507                         chip->probing = 1;
 508                         break;
 509                 }
 510         }
 511         if (! chip) {
 512                 /* it's a fresh one.
 513                  * now look for an empty slot and create a new card instance
 514                  */
 515                 for (i = 0; i < SNDRV_CARDS; i++)
 516                         if (enable[i] && ! usb_chip[i] &&
 517                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 518                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 519                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
 520                                         goto __error;
 521                                 }
 522                                 snd_card_set_dev(chip->card, &intf->dev);
 523                                 chip->pm_intf = intf;
 524                                 break;
 525                         }
 526                 if (!chip) {
 527                         printk(KERN_ERR "no available usb audio device\n");
 528                         goto __error;
 529                 }
 530         }
 531
 532         /*
 533          * For devices with more than one control interface, we assume the
 534          * first contains the audio controls. We might need a more specific
 535          * check here in the future.
 536          */
 537         if (!chip->ctrl_intf)
 538                 chip->ctrl_intf = alts;
 539
 540         chip->txfr_quirk = 0;
 541         err = 1; /* continue */
 542         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 543                 /* need some special handlings */
 544                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
 545                         goto __error;
 546         }
 547
 548         if (err > 0) {
 549                 /* create normal USB audio interfaces */
 550                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
 551                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
 552                         goto __error;
 553                 }
 554         }
 555
 556         /* we are allowed to call snd_card_register() many times */
 557         if (snd_card_register(chip->card) < 0) {
 558                 goto __error;
 559         }
 560
 561         usb_chip[chip->index] = chip;
 562         chip->num_interfaces++;
 563         chip->probing = 0;
 564         mutex_unlock(&register_mutex);
 565         return chip;
 566
 567  __error:
 568         if (chip) {
 569                 if (!chip->num_interfaces)
 570                         snd_card_free(chip->card);
 571                 chip->probing = 0;
 572         }
 573         mutex_unlock(&register_mutex);
 574  __err_val:
 575         return NULL;
 576 }
 577
 578 /*
 579  * we need to take care of counter, since disconnection can be called also
 580  * many times as well as usb_audio_probe().
 581  */
 582 static void snd_usb_audio_disconnect(struct usb_device *dev,
 583                                      struct snd_usb_audio *chip)
 584 {
 585         struct snd_card *card;
 586         struct list_head *p, *n;
 587
 588         if (chip == (void *)-1L)
 589                 return;
 590
 591         card = chip->card;
 592         down_write(&chip->shutdown_rwsem);
 593         chip->shutdown = 1;
 594         up_write(&chip->shutdown_rwsem);
 595
 596         mutex_lock(&register_mutex);
 597         chip->num_interfaces--;
 598         if (chip->num_interfaces <= 0) {
 599                 snd_card_disconnect(card);
 600                 /* release the pcm resources */
 601                 list_for_each(p, &chip->pcm_list) {
 602                         snd_usb_stream_disconnect(p);
 603                 }
 604                 /* release the endpoint resources */
 605                 list_for_each_safe(p, n, &chip->ep_list) {
 606                         snd_usb_endpoint_free(p);
 607                 }
 608                 /* release the midi resources */
 609                 list_for_each(p, &chip->midi_list) {
 610                         snd_usbmidi_disconnect(p);
 611                 }
 612                 /* release mixer resources */
 613                 list_for_each(p, &chip->mixer_list) {
 614                         snd_usb_mixer_disconnect(p);
 615                 }
 616                 usb_chip[chip->index] = NULL;
 617                 mutex_unlock(&register_mutex);
 618                 snd_card_free_when_closed(card);
 619         } else {
 620                 mutex_unlock(&register_mutex);
 621         }
 622 }
 623
 624 /*
 625  * new 2.5 USB kernel API
 626  */
 627 static int usb_audio_probe(struct usb_interface *intf,
 628                            const struct usb_device_id *id)
 629 {
 630         struct snd_usb_audio *chip;
 631         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
 632         if (chip) {
 633                 usb_set_intfdata(intf, chip);
 634                 return 0;
 635         } else
 636                 return -EIO;
 637 }
 638
 639 static void usb_audio_disconnect(struct usb_interface *intf)
 640 {
 641         snd_usb_audio_disconnect(interface_to_usbdev(intf),
 642                                  usb_get_intfdata(intf));
 643 }
 644
 645 #ifdef CONFIG_PM
 646
 647 int snd_usb_autoresume(struct snd_usb_audio *chip)
 648 {
 649         int err = -ENODEV;
 650
 651         down_read(&chip->shutdown_rwsem);
 652         if (chip->probing)
 653                 err = 0;
 654         else if (!chip->shutdown)
 655                 err = usb_autopm_get_interface(chip->pm_intf);
 656         up_read(&chip->shutdown_rwsem);
 657
 658         return err;
 659 }
 660
 661 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 662 {
 663         down_read(&chip->shutdown_rwsem);
 664         if (!chip->shutdown && !chip->probing)
 665                 usb_autopm_put_interface(chip->pm_intf);
 666         up_read(&chip->shutdown_rwsem);
 667 }
 668
 669 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 670 {
 671         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 672         struct snd_usb_stream *as;
 673         struct usb_mixer_interface *mixer;
 674
 675         if (chip == (void *)-1L)
 676                 return 0;
 677
 678         if (!PMSG_IS_AUTO(message)) {
 679                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 680                 if (!chip->num_suspended_intf++) {
 681                         list_for_each_entry(as, &chip->pcm_list, list) {
 682                                 snd_pcm_suspend_all(as->pcm);
 683                                 as->substream[0].need_setup_ep =
 684                                         as->substream[1].need_setup_ep = true;
 685                         }
 686                 }
 687         } else {
 688                 /*
 689                  * otherwise we keep the rest of the system in the dark
 690                  * to keep this transparent
 691                  */
 692                 if (!chip->num_suspended_intf++)
 693                         chip->autosuspended = 1;
 694         }
 695
 696         list_for_each_entry(mixer, &chip->mixer_list, list)
 697                 snd_usb_mixer_inactivate(mixer);
 698
 699         return 0;
 700 }
 701
 702 static int usb_audio_resume(struct usb_interface *intf)
 703 {
 704         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 705         struct usb_mixer_interface *mixer;
 706         int err = 0;
 707
 708         if (chip == (void *)-1L)
 709                 return 0;
 710         if (--chip->num_suspended_intf)
 711                 return 0;
 712         /*
 713          * ALSA leaves material resumption to user space
 714          * we just notify and restart the mixers
 715          */
 716         list_for_each_entry(mixer, &chip->mixer_list, list) {
 717                 err = snd_usb_mixer_activate(mixer);
 718                 if (err < 0)
 719                         goto err_out;
 720         }
 721
 722         if (!chip->autosuspended)
 723                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 724         chip->autosuspended = 0;
 725
 726 err_out:
 727         return err;
 728 }
 729 #else
 730 #define usb_audio_suspend       NULL
 731 #define usb_audio_resume        NULL
 732 #endif          /* CONFIG_PM */
 733
 734 static struct usb_device_id usb_audio_ids [] = {
 735 #include "quirks-table.h"
 736     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 737       .bInterfaceClass = USB_CLASS_AUDIO,
 738       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 739     { }                                         /* Terminating entry */
 740 };
 741 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 742
 743 /*
 744  * entry point for linux usb interface
 745  */
 746
 747 static struct usb_driver usb_audio_driver = {
 748         .name =         "snd-usb-audio",
 749         .probe =        usb_audio_probe,
 750         .disconnect =   usb_audio_disconnect,
 751         .suspend =      usb_audio_suspend,
 752         .resume =       usb_audio_resume,
 753         .id_table =     usb_audio_ids,
 754         .supports_autosuspend = 1,
 755 };
 756
 757 static int __init snd_usb_audio_init(void)
 758 {
 759         if (nrpacks < 1 || nrpacks > MAX_PACKS) {
 760                 printk(KERN_WARNING "invalid nrpacks value.\n");
 761                 return -EINVAL;
 762         }
 763         return usb_register(&usb_audio_driver);
 764 }
 765
 766 static void __exit snd_usb_audio_cleanup(void)
 767 {
 768         usb_deregister(&usb_audio_driver);
 769 }
 770
 771 module_init(snd_usb_audio_init);
 772 module_exit(snd_usb_audio_cleanup);