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 device_setup[SNDRV_CARDS]; /* device parameter for this card */
  83 static bool ignore_ctl_error;
  84 static bool autoclock = true;
  85
  86 module_param_array(index, int, NULL, 0444);
  87 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  88 module_param_array(id, charp, NULL, 0444);
  89 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  90 module_param_array(enable, bool, NULL, 0444);
  91 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  92 module_param_array(vid, int, NULL, 0444);
  93 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  94 module_param_array(pid, int, NULL, 0444);
  95 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
  96 module_param_array(device_setup, int, NULL, 0444);
  97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
  98 module_param(ignore_ctl_error, bool, 0444);
  99 MODULE_PARM_DESC(ignore_ctl_error,
 100                  "Ignore errors from USB controller for mixer interfaces.");
 101 module_param(autoclock, bool, 0444);
 102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
 103
 104 /*
 105  * we keep the snd_usb_audio_t instances by ourselves for merging
 106  * the all interfaces on the same card as one sound device.
 107  */
 108
 109 static DEFINE_MUTEX(register_mutex);
 110 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 111 static struct usb_driver usb_audio_driver;
 112
 113 /*
 114  * disconnect streams
 115  * called from usb_audio_disconnect()
 116  */
 117 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
 118 {
 119         int idx;
 120         struct snd_usb_substream *subs;
 121
 122         for (idx = 0; idx < 2; idx++) {
 123                 subs = &as->substream[idx];
 124                 if (!subs->num_formats)
 125                         continue;
 126                 subs->interface = -1;
 127                 subs->data_endpoint = NULL;
 128                 subs->sync_endpoint = NULL;
 129         }
 130 }
 131
 132 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 133 {
 134         struct usb_device *dev = chip->dev;
 135         struct usb_host_interface *alts;
 136         struct usb_interface_descriptor *altsd;
 137         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 138
 139         if (!iface) {
 140                 dev_err(&dev->dev, "%u:%d : does not exist\n",
 141                         ctrlif, interface);
 142                 return -EINVAL;
 143         }
 144
 145         alts = &iface->altsetting[0];
 146         altsd = get_iface_desc(alts);
 147
 148         /*
 149          * Android with both accessory and audio interfaces enabled gets the
 150          * interface numbers wrong.
 151          */
 152         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 153              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 154             interface == 0 &&
 155             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 156             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 157                 interface = 2;
 158                 iface = usb_ifnum_to_if(dev, interface);
 159                 if (!iface)
 160                         return -EINVAL;
 161                 alts = &iface->altsetting[0];
 162                 altsd = get_iface_desc(alts);
 163         }
 164
 165         if (usb_interface_claimed(iface)) {
 166                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
 167                         ctrlif, interface);
 168                 return -EINVAL;
 169         }
 170
 171         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 172              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 173             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 174                 int err = snd_usbmidi_create(chip->card, iface,
 175                                              &chip->midi_list, NULL);
 176                 if (err < 0) {
 177                         dev_err(&dev->dev,
 178                                 "%u:%d: cannot create sequencer device\n",
 179                                 ctrlif, interface);
 180                         return -EINVAL;
 181                 }
 182                 return usb_driver_claim_interface(&usb_audio_driver, iface,
 183                                                   USB_AUDIO_IFACE_UNUSED);
 184         }
 185
 186         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 187              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 188             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 189                 dev_dbg(&dev->dev,
 190                         "%u:%d: skipping non-supported interface %d\n",
 191                         ctrlif, interface, altsd->bInterfaceClass);
 192                 /* skip non-supported classes */
 193                 return -EINVAL;
 194         }
 195
 196         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 197                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
 198                 return -EINVAL;
 199         }
 200
 201         if (! snd_usb_parse_audio_interface(chip, interface)) {
 202                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 203                 return usb_driver_claim_interface(&usb_audio_driver, iface,
 204                                                   USB_AUDIO_IFACE_UNUSED);
 205         }
 206
 207         return 0;
 208 }
 209
 210 /*
 211  * parse audio control descriptor and create pcm/midi streams
 212  */
 213 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 214 {
 215         struct usb_device *dev = chip->dev;
 216         struct usb_host_interface *host_iface;
 217         struct usb_interface_descriptor *altsd;
 218         void *control_header;
 219         int i, protocol;
 220         int rest_bytes;
 221
 222         /* find audiocontrol interface */
 223         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 224         control_header = snd_usb_find_csint_desc(host_iface->extra,
 225                                                  host_iface->extralen,
 226                                                  NULL, UAC_HEADER);
 227         altsd = get_iface_desc(host_iface);
 228         protocol = altsd->bInterfaceProtocol;
 229
 230         if (!control_header) {
 231                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
 232                 return -EINVAL;
 233         }
 234
 235         rest_bytes = (void *)(host_iface->extra + host_iface->extralen) -
 236                 control_header;
 237
 238         /* just to be sure -- this shouldn't hit at all */
 239         if (rest_bytes <= 0) {
 240                 dev_err(&dev->dev, "invalid control header\n");
 241                 return -EINVAL;
 242         }
 243
 244         switch (protocol) {
 245         default:
 246                 dev_warn(&dev->dev,
 247                          "unknown interface protocol %#02x, assuming v1\n",
 248                          protocol);
 249                 /* fall through */
 250
 251         case UAC_VERSION_1: {
 252                 struct uac1_ac_header_descriptor *h1 = control_header;
 253
 254                 if (rest_bytes < sizeof(*h1)) {
 255                         dev_err(&dev->dev, "too short v1 buffer descriptor\n");
 256                         return -EINVAL;
 257                 }
 258
 259                 if (!h1->bInCollection) {
 260                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
 261                         return -EINVAL;
 262                 }
 263
 264                 if (rest_bytes < h1->bLength) {
 265                         dev_err(&dev->dev, "invalid buffer length (v1)\n");
 266                         return -EINVAL;
 267                 }
 268
 269                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 270                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
 271                         return -EINVAL;
 272                 }
 273
 274                 for (i = 0; i < h1->bInCollection; i++)
 275                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 276
 277                 break;
 278         }
 279
 280         case UAC_VERSION_2: {
 281                 struct usb_interface_assoc_descriptor *assoc =
 282                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 283
 284                 if (!assoc) {
 285                         /*
 286                          * Firmware writers cannot count to three.  So to find
 287                          * the IAD on the NuForce UDH-100, also check the next
 288                          * interface.
 289                          */
 290                         struct usb_interface *iface =
 291                                 usb_ifnum_to_if(dev, ctrlif + 1);
 292                         if (iface &&
 293                             iface->intf_assoc &&
 294                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 295                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 296                                 assoc = iface->intf_assoc;
 297                 }
 298
 299                 if (!assoc) {
 300                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
 301                         return -EINVAL;
 302                 }
 303
 304                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 305                         int intf = assoc->bFirstInterface + i;
 306
 307                         if (intf != ctrlif)
 308                                 snd_usb_create_stream(chip, ctrlif, intf);
 309                 }
 310
 311                 break;
 312         }
 313         }
 314
 315         return 0;
 316 }
 317
 318 /*
 319  * free the chip instance
 320  *
 321  * here we have to do not much, since pcm and controls are already freed
 322  *
 323  */
 324
 325 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 326 {
 327         struct snd_usb_endpoint *ep, *n;
 328
 329         list_for_each_entry_safe(ep, n, &chip->ep_list, list)
 330                 snd_usb_endpoint_free(ep);
 331
 332         mutex_destroy(&chip->mutex);
 333         kfree(chip);
 334         return 0;
 335 }
 336
 337 static int snd_usb_audio_dev_free(struct snd_device *device)
 338 {
 339         struct snd_usb_audio *chip = device->device_data;
 340         return snd_usb_audio_free(chip);
 341 }
 342
 343 /*
 344  * create a chip instance and set its names.
 345  */
 346 static int snd_usb_audio_create(struct usb_interface *intf,
 347                                 struct usb_device *dev, int idx,
 348                                 const struct snd_usb_audio_quirk *quirk,
 349                                 struct snd_usb_audio **rchip)
 350 {
 351         struct snd_card *card;
 352         struct snd_usb_audio *chip;
 353         int err, len;
 354         char component[14];
 355         static struct snd_device_ops ops = {
 356                 .dev_free =     snd_usb_audio_dev_free,
 357         };
 358
 359         *rchip = NULL;
 360
 361         switch (snd_usb_get_speed(dev)) {
 362         case USB_SPEED_LOW:
 363         case USB_SPEED_FULL:
 364         case USB_SPEED_HIGH:
 365         case USB_SPEED_WIRELESS:
 366         case USB_SPEED_SUPER:
 367                 break;
 368         default:
 369                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
 370                 return -ENXIO;
 371         }
 372
 373         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
 374                            0, &card);
 375         if (err < 0) {
 376                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
 377                 return err;
 378         }
 379
 380         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 381         if (! chip) {
 382                 snd_card_free(card);
 383                 return -ENOMEM;
 384         }
 385
 386         mutex_init(&chip->mutex);
 387         init_waitqueue_head(&chip->shutdown_wait);
 388         chip->index = idx;
 389         chip->dev = dev;
 390         chip->card = card;
 391         chip->setup = device_setup[idx];
 392         chip->autoclock = autoclock;
 393         atomic_set(&chip->active, 1); /* avoid autopm during probing */
 394         atomic_set(&chip->usage_count, 0);
 395         atomic_set(&chip->shutdown, 0);
 396
 397         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 398                               le16_to_cpu(dev->descriptor.idProduct));
 399         INIT_LIST_HEAD(&chip->pcm_list);
 400         INIT_LIST_HEAD(&chip->ep_list);
 401         INIT_LIST_HEAD(&chip->midi_list);
 402         INIT_LIST_HEAD(&chip->mixer_list);
 403
 404         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 405                 snd_usb_audio_free(chip);
 406                 snd_card_free(card);
 407                 return err;
 408         }
 409
 410         strcpy(card->driver, "USB-Audio");
 411         sprintf(component, "USB%04x:%04x",
 412                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 413         snd_component_add(card, component);
 414
 415         /* retrieve the device string as shortname */
 416         if (quirk && quirk->product_name && *quirk->product_name) {
 417                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 418         } else {
 419                 if (!dev->descriptor.iProduct ||
 420                     usb_string(dev, dev->descriptor.iProduct,
 421                     card->shortname, sizeof(card->shortname)) <= 0) {
 422                         /* no name available from anywhere, so use ID */
 423                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 424                                 USB_ID_VENDOR(chip->usb_id),
 425                                 USB_ID_PRODUCT(chip->usb_id));
 426                 }
 427         }
 428         strim(card->shortname);
 429
 430         /* retrieve the vendor and device strings as longname */
 431         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 432                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 433         } else {
 434                 if (dev->descriptor.iManufacturer)
 435                         len = usb_string(dev, dev->descriptor.iManufacturer,
 436                                          card->longname, sizeof(card->longname));
 437                 else
 438                         len = 0;
 439                 /* we don't really care if there isn't any vendor string */
 440         }
 441         if (len > 0) {
 442                 strim(card->longname);
 443                 if (*card->longname)
 444                         strlcat(card->longname, " ", sizeof(card->longname));
 445         }
 446
 447         strlcat(card->longname, card->shortname, sizeof(card->longname));
 448
 449         len = strlcat(card->longname, " at ", sizeof(card->longname));
 450
 451         if (len < sizeof(card->longname))
 452                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 453
 454         switch (snd_usb_get_speed(dev)) {
 455         case USB_SPEED_LOW:
 456                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 457                 break;
 458         case USB_SPEED_FULL:
 459                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 460                 break;
 461         case USB_SPEED_HIGH:
 462                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 463                 break;
 464         case USB_SPEED_SUPER:
 465                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 466                 break;
 467         default:
 468                 break;
 469         }
 470
 471         snd_usb_audio_create_proc(chip);
 472
 473         *rchip = chip;
 474         return 0;
 475 }
 476
 477 /*
 478  * probe the active usb device
 479  *
 480  * note that this can be called multiple times per a device, when it
 481  * includes multiple audio control interfaces.
 482  *
 483  * thus we check the usb device pointer and creates the card instance
 484  * only at the first time.  the successive calls of this function will
 485  * append the pcm interface to the corresponding card.
 486  */
 487 static int usb_audio_probe(struct usb_interface *intf,
 488                            const struct usb_device_id *usb_id)
 489 {
 490         struct usb_device *dev = interface_to_usbdev(intf);
 491         const struct snd_usb_audio_quirk *quirk =
 492                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 493         struct snd_usb_audio *chip;
 494         int i, err;
 495         struct usb_host_interface *alts;
 496         int ifnum;
 497         u32 id;
 498
 499         alts = &intf->altsetting[0];
 500         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 501         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 502                     le16_to_cpu(dev->descriptor.idProduct));
 503         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 504                 return -ENXIO;
 505
 506         err = snd_usb_apply_boot_quirk(dev, intf, quirk);
 507         if (err < 0)
 508                 return err;
 509
 510         /*
 511          * found a config.  now register to ALSA
 512          */
 513
 514         /* check whether it's already registered */
 515         chip = NULL;
 516         mutex_lock(&register_mutex);
 517         for (i = 0; i < SNDRV_CARDS; i++) {
 518                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 519                         if (atomic_read(&usb_chip[i]->shutdown)) {
 520                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
 521                                 err = -EIO;
 522                                 goto __error;
 523                         }
 524                         chip = usb_chip[i];
 525                         atomic_inc(&chip->active); /* avoid autopm */
 526                         break;
 527                 }
 528         }
 529         if (! chip) {
 530                 /* it's a fresh one.
 531                  * now look for an empty slot and create a new card instance
 532                  */
 533                 for (i = 0; i < SNDRV_CARDS; i++)
 534                         if (enable[i] && ! usb_chip[i] &&
 535                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 536                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 537                                 err = snd_usb_audio_create(intf, dev, i, quirk,
 538                                                            &chip);
 539                                 if (err < 0)
 540                                         goto __error;
 541                                 chip->pm_intf = intf;
 542                                 break;
 543                         }
 544                 if (!chip) {
 545                         dev_err(&dev->dev, "no available usb audio device\n");
 546                         err = -ENODEV;
 547                         goto __error;
 548                 }
 549         }
 550
 551         /*
 552          * For devices with more than one control interface, we assume the
 553          * first contains the audio controls. We might need a more specific
 554          * check here in the future.
 555          */
 556         if (!chip->ctrl_intf)
 557                 chip->ctrl_intf = alts;
 558
 559         chip->txfr_quirk = 0;
 560         err = 1; /* continue */
 561         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 562                 /* need some special handlings */
 563                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
 564                 if (err < 0)
 565                         goto __error;
 566         }
 567
 568         if (err > 0) {
 569                 /* create normal USB audio interfaces */
 570                 err = snd_usb_create_streams(chip, ifnum);
 571                 if (err < 0)
 572                         goto __error;
 573                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
 574                 if (err < 0)
 575                         goto __error;
 576         }
 577
 578         /* we are allowed to call snd_card_register() many times */
 579         err = snd_card_register(chip->card);
 580         if (err < 0)
 581                 goto __error;
 582
 583         usb_chip[chip->index] = chip;
 584         chip->num_interfaces++;
 585         usb_set_intfdata(intf, chip);
 586         atomic_dec(&chip->active);
 587         mutex_unlock(&register_mutex);
 588         return 0;
 589
 590  __error:
 591         if (chip) {
 592                 /* chip->active is inside the chip->card object,
 593                  * decrement before memory is possibly returned.
 594                  */
 595                 atomic_dec(&chip->active);
 596                 if (!chip->num_interfaces)
 597                         snd_card_free(chip->card);
 598         }
 599         mutex_unlock(&register_mutex);
 600         return err;
 601 }
 602
 603 /*
 604  * we need to take care of counter, since disconnection can be called also
 605  * many times as well as usb_audio_probe().
 606  */
 607 static void usb_audio_disconnect(struct usb_interface *intf)
 608 {
 609         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 610         struct snd_card *card;
 611         struct list_head *p;
 612
 613         if (chip == USB_AUDIO_IFACE_UNUSED)
 614                 return;
 615
 616         card = chip->card;
 617
 618         mutex_lock(&register_mutex);
 619         if (atomic_inc_return(&chip->shutdown) == 1) {
 620                 struct snd_usb_stream *as;
 621                 struct snd_usb_endpoint *ep;
 622                 struct usb_mixer_interface *mixer;
 623
 624                 /* wait until all pending tasks done;
 625                  * they are protected by snd_usb_lock_shutdown()
 626                  */
 627                 wait_event(chip->shutdown_wait,
 628                            !atomic_read(&chip->usage_count));
 629                 snd_card_disconnect(card);
 630                 /* release the pcm resources */
 631                 list_for_each_entry(as, &chip->pcm_list, list) {
 632                         snd_usb_stream_disconnect(as);
 633                 }
 634                 /* release the endpoint resources */
 635                 list_for_each_entry(ep, &chip->ep_list, list) {
 636                         snd_usb_endpoint_release(ep);
 637                 }
 638                 /* release the midi resources */
 639                 list_for_each(p, &chip->midi_list) {
 640                         snd_usbmidi_disconnect(p);
 641                 }
 642                 /* release mixer resources */
 643                 list_for_each_entry(mixer, &chip->mixer_list, list) {
 644                         snd_usb_mixer_disconnect(mixer);
 645                 }
 646         }
 647
 648         chip->num_interfaces--;
 649         if (chip->num_interfaces <= 0) {
 650                 usb_chip[chip->index] = NULL;
 651                 mutex_unlock(&register_mutex);
 652                 snd_card_free_when_closed(card);
 653         } else {
 654                 mutex_unlock(&register_mutex);
 655         }
 656 }
 657
 658 /* lock the shutdown (disconnect) task and autoresume */
 659 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
 660 {
 661         int err;
 662
 663         atomic_inc(&chip->usage_count);
 664         if (atomic_read(&chip->shutdown)) {
 665                 err = -EIO;
 666                 goto error;
 667         }
 668         err = snd_usb_autoresume(chip);
 669         if (err < 0)
 670                 goto error;
 671         return 0;
 672
 673  error:
 674         if (atomic_dec_and_test(&chip->usage_count))
 675                 wake_up(&chip->shutdown_wait);
 676         return err;
 677 }
 678
 679 /* autosuspend and unlock the shutdown */
 680 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
 681 {
 682         snd_usb_autosuspend(chip);
 683         if (atomic_dec_and_test(&chip->usage_count))
 684                 wake_up(&chip->shutdown_wait);
 685 }
 686
 687 #ifdef CONFIG_PM
 688
 689 int snd_usb_autoresume(struct snd_usb_audio *chip)
 690 {
 691         if (atomic_read(&chip->shutdown))
 692                 return -EIO;
 693         if (atomic_inc_return(&chip->active) == 1)
 694                 return usb_autopm_get_interface(chip->pm_intf);
 695         return 0;
 696 }
 697
 698 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 699 {
 700         if (atomic_read(&chip->shutdown))
 701                 return;
 702         if (atomic_dec_and_test(&chip->active))
 703                 usb_autopm_put_interface(chip->pm_intf);
 704 }
 705
 706 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 707 {
 708         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 709         struct snd_usb_stream *as;
 710         struct usb_mixer_interface *mixer;
 711         struct list_head *p;
 712
 713         if (chip == USB_AUDIO_IFACE_UNUSED)
 714                 return 0;
 715
 716         if (!chip->num_suspended_intf++) {
 717                 list_for_each_entry(as, &chip->pcm_list, list) {
 718                         snd_pcm_suspend_all(as->pcm);
 719                         as->substream[0].need_setup_ep =
 720                                 as->substream[1].need_setup_ep = true;
 721                 }
 722                 list_for_each(p, &chip->midi_list)
 723                         snd_usbmidi_suspend(p);
 724                 list_for_each_entry(mixer, &chip->mixer_list, list)
 725                         snd_usb_mixer_suspend(mixer);
 726         }
 727
 728         if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
 729                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 730                 chip->system_suspend = chip->num_suspended_intf;
 731         }
 732
 733         return 0;
 734 }
 735
 736 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
 737 {
 738         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 739         struct usb_mixer_interface *mixer;
 740         struct list_head *p;
 741         int err = 0;
 742
 743         if (chip == USB_AUDIO_IFACE_UNUSED)
 744                 return 0;
 745
 746         atomic_inc(&chip->active); /* avoid autopm */
 747         if (chip->num_suspended_intf > 1)
 748                 goto out;
 749
 750         /*
 751          * ALSA leaves material resumption to user space
 752          * we just notify and restart the mixers
 753          */
 754         list_for_each_entry(mixer, &chip->mixer_list, list) {
 755                 err = snd_usb_mixer_resume(mixer, reset_resume);
 756                 if (err < 0)
 757                         goto err_out;
 758         }
 759
 760         list_for_each(p, &chip->midi_list) {
 761                 snd_usbmidi_resume(p);
 762         }
 763
 764  out:
 765         if (chip->num_suspended_intf == chip->system_suspend) {
 766                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 767                 chip->system_suspend = 0;
 768         }
 769         chip->num_suspended_intf--;
 770
 771 err_out:
 772         atomic_dec(&chip->active); /* allow autopm after this point */
 773         return err;
 774 }
 775
 776 static int usb_audio_resume(struct usb_interface *intf)
 777 {
 778         return __usb_audio_resume(intf, false);
 779 }
 780
 781 static int usb_audio_reset_resume(struct usb_interface *intf)
 782 {
 783         return __usb_audio_resume(intf, true);
 784 }
 785 #else
 786 #define usb_audio_suspend       NULL
 787 #define usb_audio_resume        NULL
 788 #define usb_audio_reset_resume  NULL
 789 #endif          /* CONFIG_PM */
 790
 791 static struct usb_device_id usb_audio_ids [] = {
 792 #include "quirks-table.h"
 793     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 794       .bInterfaceClass = USB_CLASS_AUDIO,
 795       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 796     { }                                         /* Terminating entry */
 797 };
 798 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 799
 800 /*
 801  * entry point for linux usb interface
 802  */
 803
 804 static struct usb_driver usb_audio_driver = {
 805         .name =         "snd-usb-audio",
 806         .probe =        usb_audio_probe,
 807         .disconnect =   usb_audio_disconnect,
 808         .suspend =      usb_audio_suspend,
 809         .resume =       usb_audio_resume,
 810         .reset_resume = usb_audio_reset_resume,
 811         .id_table =     usb_audio_ids,
 812         .supports_autosuspend = 1,
 813 };
 814
 815 module_usb_driver(usb_audio_driver);