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 #include "media.h"
  70
  71 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  72 MODULE_DESCRIPTION("USB Audio");
  73 MODULE_LICENSE("GPL");
  74 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  75
  76
  77 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  78 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  79 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  80 /* Vendor/product IDs for this card */
  81 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  82 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  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_array(device_setup, int, NULL, 0444);
  98 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
  99 module_param(ignore_ctl_error, bool, 0444);
 100 MODULE_PARM_DESC(ignore_ctl_error,
 101                  "Ignore errors from USB controller for mixer interfaces.");
 102 module_param(autoclock, bool, 0444);
 103 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
 104
 105 /*
 106  * we keep the snd_usb_audio_t instances by ourselves for merging
 107  * the all interfaces on the same card as one sound device.
 108  */
 109
 110 static DEFINE_MUTEX(register_mutex);
 111 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 112 static struct usb_driver usb_audio_driver;
 113
 114 /*
 115  * disconnect streams
 116  * called from usb_audio_disconnect()
 117  */
 118 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
 119 {
 120         int idx;
 121         struct snd_usb_substream *subs;
 122
 123         for (idx = 0; idx < 2; idx++) {
 124                 subs = &as->substream[idx];
 125                 if (!subs->num_formats)
 126                         continue;
 127                 subs->interface = -1;
 128                 subs->data_endpoint = NULL;
 129                 subs->sync_endpoint = NULL;
 130         }
 131 }
 132
 133 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 134 {
 135         struct usb_device *dev = chip->dev;
 136         struct usb_host_interface *alts;
 137         struct usb_interface_descriptor *altsd;
 138         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 139
 140         if (!iface) {
 141                 dev_err(&dev->dev, "%u:%d : does not exist\n",
 142                         ctrlif, interface);
 143                 return -EINVAL;
 144         }
 145
 146         alts = &iface->altsetting[0];
 147         altsd = get_iface_desc(alts);
 148
 149         /*
 150          * Android with both accessory and audio interfaces enabled gets the
 151          * interface numbers wrong.
 152          */
 153         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 154              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 155             interface == 0 &&
 156             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 157             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 158                 interface = 2;
 159                 iface = usb_ifnum_to_if(dev, interface);
 160                 if (!iface)
 161                         return -EINVAL;
 162                 alts = &iface->altsetting[0];
 163                 altsd = get_iface_desc(alts);
 164         }
 165
 166         if (usb_interface_claimed(iface)) {
 167                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
 168                         ctrlif, interface);
 169                 return -EINVAL;
 170         }
 171
 172         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 173              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 174             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 175                 int err = snd_usbmidi_create(chip->card, iface,
 176                                              &chip->midi_list, NULL);
 177                 if (err < 0) {
 178                         dev_err(&dev->dev,
 179                                 "%u:%d: cannot create sequencer device\n",
 180                                 ctrlif, interface);
 181                         return -EINVAL;
 182                 }
 183                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 184
 185                 return 0;
 186         }
 187
 188         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 189              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 190             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 191                 dev_dbg(&dev->dev,
 192                         "%u:%d: skipping non-supported interface %d\n",
 193                         ctrlif, interface, altsd->bInterfaceClass);
 194                 /* skip non-supported classes */
 195                 return -EINVAL;
 196         }
 197
 198         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 199                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
 200                 return -EINVAL;
 201         }
 202
 203         if (! snd_usb_parse_audio_interface(chip, interface)) {
 204                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 205                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 206                 return -EINVAL;
 207         }
 208
 209         return 0;
 210 }
 211
 212 /*
 213  * parse audio control descriptor and create pcm/midi streams
 214  */
 215 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 216 {
 217         struct usb_device *dev = chip->dev;
 218         struct usb_host_interface *host_iface;
 219         struct usb_interface_descriptor *altsd;
 220         void *control_header;
 221         int i, protocol;
 222
 223         /* find audiocontrol interface */
 224         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 225         control_header = snd_usb_find_csint_desc(host_iface->extra,
 226                                                  host_iface->extralen,
 227                                                  NULL, UAC_HEADER);
 228         altsd = get_iface_desc(host_iface);
 229         protocol = altsd->bInterfaceProtocol;
 230
 231         if (!control_header) {
 232                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
 233                 return -EINVAL;
 234         }
 235
 236         switch (protocol) {
 237         default:
 238                 dev_warn(&dev->dev,
 239                          "unknown interface protocol %#02x, assuming v1\n",
 240                          protocol);
 241                 /* fall through */
 242
 243         case UAC_VERSION_1: {
 244                 struct uac1_ac_header_descriptor *h1 = control_header;
 245
 246                 if (!h1->bInCollection) {
 247                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
 248                         return -EINVAL;
 249                 }
 250
 251                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 252                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
 253                         return -EINVAL;
 254                 }
 255
 256                 for (i = 0; i < h1->bInCollection; i++)
 257                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 258
 259                 break;
 260         }
 261
 262         case UAC_VERSION_2: {
 263                 struct usb_interface_assoc_descriptor *assoc =
 264                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 265
 266                 if (!assoc) {
 267                         /*
 268                          * Firmware writers cannot count to three.  So to find
 269                          * the IAD on the NuForce UDH-100, also check the next
 270                          * interface.
 271                          */
 272                         struct usb_interface *iface =
 273                                 usb_ifnum_to_if(dev, ctrlif + 1);
 274                         if (iface &&
 275                             iface->intf_assoc &&
 276                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 277                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 278                                 assoc = iface->intf_assoc;
 279                 }
 280
 281                 if (!assoc) {
 282                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
 283                         return -EINVAL;
 284                 }
 285
 286                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 287                         int intf = assoc->bFirstInterface + i;
 288
 289                         if (intf != ctrlif)
 290                                 snd_usb_create_stream(chip, ctrlif, intf);
 291                 }
 292
 293                 break;
 294         }
 295         }
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * free the chip instance
 302  *
 303  * here we have to do not much, since pcm and controls are already freed
 304  *
 305  */
 306
 307 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 308 {
 309         struct snd_usb_endpoint *ep, *n;
 310
 311         list_for_each_entry_safe(ep, n, &chip->ep_list, list)
 312                 snd_usb_endpoint_free(ep);
 313
 314         mutex_destroy(&chip->mutex);
 315         kfree(chip);
 316         return 0;
 317 }
 318
 319 static int snd_usb_audio_dev_free(struct snd_device *device)
 320 {
 321         struct snd_usb_audio *chip = device->device_data;
 322         return snd_usb_audio_free(chip);
 323 }
 324
 325 /*
 326  * create a chip instance and set its names.
 327  */
 328 static int snd_usb_audio_create(struct usb_interface *intf,
 329                                 struct usb_device *dev, int idx,
 330                                 const struct snd_usb_audio_quirk *quirk,
 331                                 struct snd_usb_audio **rchip)
 332 {
 333         struct snd_card *card;
 334         struct snd_usb_audio *chip;
 335         int err, len;
 336         char component[14];
 337         static struct snd_device_ops ops = {
 338                 .dev_free =     snd_usb_audio_dev_free,
 339         };
 340
 341         *rchip = NULL;
 342
 343         switch (snd_usb_get_speed(dev)) {
 344         case USB_SPEED_LOW:
 345         case USB_SPEED_FULL:
 346         case USB_SPEED_HIGH:
 347         case USB_SPEED_WIRELESS:
 348         case USB_SPEED_SUPER:
 349                 break;
 350         default:
 351                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
 352                 return -ENXIO;
 353         }
 354
 355         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
 356                            0, &card);
 357         if (err < 0) {
 358                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
 359                 return err;
 360         }
 361
 362         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 363         if (! chip) {
 364                 snd_card_free(card);
 365                 return -ENOMEM;
 366         }
 367
 368         mutex_init(&chip->mutex);
 369         init_waitqueue_head(&chip->shutdown_wait);
 370         chip->index = idx;
 371         chip->dev = dev;
 372         chip->card = card;
 373         chip->setup = device_setup[idx];
 374         chip->autoclock = autoclock;
 375         atomic_set(&chip->active, 1); /* avoid autopm during probing */
 376         atomic_set(&chip->usage_count, 0);
 377         atomic_set(&chip->shutdown, 0);
 378
 379         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 380                               le16_to_cpu(dev->descriptor.idProduct));
 381         INIT_LIST_HEAD(&chip->pcm_list);
 382         INIT_LIST_HEAD(&chip->ep_list);
 383         INIT_LIST_HEAD(&chip->midi_list);
 384         INIT_LIST_HEAD(&chip->mixer_list);
 385
 386         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 387                 snd_usb_audio_free(chip);
 388                 snd_card_free(card);
 389                 return err;
 390         }
 391
 392         strcpy(card->driver, "USB-Audio");
 393         sprintf(component, "USB%04x:%04x",
 394                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 395         snd_component_add(card, component);
 396
 397         /* retrieve the device string as shortname */
 398         if (quirk && quirk->product_name && *quirk->product_name) {
 399                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 400         } else {
 401                 if (!dev->descriptor.iProduct ||
 402                     usb_string(dev, dev->descriptor.iProduct,
 403                     card->shortname, sizeof(card->shortname)) <= 0) {
 404                         /* no name available from anywhere, so use ID */
 405                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 406                                 USB_ID_VENDOR(chip->usb_id),
 407                                 USB_ID_PRODUCT(chip->usb_id));
 408                 }
 409         }
 410         strim(card->shortname);
 411
 412         /* retrieve the vendor and device strings as longname */
 413         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 414                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 415         } else {
 416                 if (dev->descriptor.iManufacturer)
 417                         len = usb_string(dev, dev->descriptor.iManufacturer,
 418                                          card->longname, sizeof(card->longname));
 419                 else
 420                         len = 0;
 421                 /* we don't really care if there isn't any vendor string */
 422         }
 423         if (len > 0) {
 424                 strim(card->longname);
 425                 if (*card->longname)
 426                         strlcat(card->longname, " ", sizeof(card->longname));
 427         }
 428
 429         strlcat(card->longname, card->shortname, sizeof(card->longname));
 430
 431         len = strlcat(card->longname, " at ", sizeof(card->longname));
 432
 433         if (len < sizeof(card->longname))
 434                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 435
 436         switch (snd_usb_get_speed(dev)) {
 437         case USB_SPEED_LOW:
 438                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 439                 break;
 440         case USB_SPEED_FULL:
 441                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 442                 break;
 443         case USB_SPEED_HIGH:
 444                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 445                 break;
 446         case USB_SPEED_SUPER:
 447                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 448                 break;
 449         default:
 450                 break;
 451         }
 452
 453         snd_usb_audio_create_proc(chip);
 454
 455         *rchip = chip;
 456         return 0;
 457 }
 458
 459 /*
 460  * probe the active usb device
 461  *
 462  * note that this can be called multiple times per a device, when it
 463  * includes multiple audio control interfaces.
 464  *
 465  * thus we check the usb device pointer and creates the card instance
 466  * only at the first time.  the successive calls of this function will
 467  * append the pcm interface to the corresponding card.
 468  */
 469 static int usb_audio_probe(struct usb_interface *intf,
 470                            const struct usb_device_id *usb_id)
 471 {
 472         struct usb_device *dev = interface_to_usbdev(intf);
 473         const struct snd_usb_audio_quirk *quirk =
 474                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 475         struct snd_usb_audio *chip;
 476         int i, err;
 477         struct usb_host_interface *alts;
 478         int ifnum;
 479         u32 id;
 480
 481         alts = &intf->altsetting[0];
 482         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 483         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 484                     le16_to_cpu(dev->descriptor.idProduct));
 485         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 486                 return -ENXIO;
 487
 488         err = snd_usb_apply_boot_quirk(dev, intf, quirk);
 489         if (err < 0)
 490                 return err;
 491
 492         /*
 493          * found a config.  now register to ALSA
 494          */
 495
 496         /* check whether it's already registered */
 497         chip = NULL;
 498         mutex_lock(&register_mutex);
 499         for (i = 0; i < SNDRV_CARDS; i++) {
 500                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 501                         if (atomic_read(&usb_chip[i]->shutdown)) {
 502                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
 503                                 err = -EIO;
 504                                 goto __error;
 505                         }
 506                         chip = usb_chip[i];
 507                         atomic_inc(&chip->active); /* avoid autopm */
 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                                 err = snd_usb_audio_create(intf, dev, i, quirk,
 520                                                            &chip);
 521                                 if (err < 0)
 522                                         goto __error;
 523                                 chip->pm_intf = intf;
 524                                 break;
 525                         }
 526                 if (!chip) {
 527                         dev_err(&dev->dev, "no available usb audio device\n");
 528                         err = -ENODEV;
 529                         goto __error;
 530                 }
 531         }
 532
 533         /*
 534          * For devices with more than one control interface, we assume the
 535          * first contains the audio controls. We might need a more specific
 536          * check here in the future.
 537          */
 538         if (!chip->ctrl_intf)
 539                 chip->ctrl_intf = alts;
 540
 541         chip->txfr_quirk = 0;
 542         err = 1; /* continue */
 543         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 544                 /* need some special handlings */
 545                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
 546                 if (err < 0)
 547                         goto __error;
 548         }
 549
 550         if (err > 0) {
 551                 /* create normal USB audio interfaces */
 552                 err = snd_usb_create_streams(chip, ifnum);
 553                 if (err < 0)
 554                         goto __error;
 555                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
 556                 if (err < 0)
 557                         goto __error;
 558         }
 559
 560         /* we are allowed to call snd_card_register() many times */
 561         err = snd_card_register(chip->card);
 562         if (err < 0)
 563                 goto __error;
 564
 565         if (quirk->media_device) {
 566                 /* don't want to fail when media_snd_device_create() fails */
 567                 media_snd_device_create(chip, intf);
 568         }
 569
 570         usb_chip[chip->index] = chip;
 571         chip->num_interfaces++;
 572         usb_set_intfdata(intf, chip);
 573         atomic_dec(&chip->active);
 574         mutex_unlock(&register_mutex);
 575         return 0;
 576
 577  __error:
 578         if (chip) {
 579                 if (!chip->num_interfaces)
 580                         snd_card_free(chip->card);
 581                 atomic_dec(&chip->active);
 582         }
 583         mutex_unlock(&register_mutex);
 584         return err;
 585 }
 586
 587 /*
 588  * we need to take care of counter, since disconnection can be called also
 589  * many times as well as usb_audio_probe().
 590  */
 591 static void usb_audio_disconnect(struct usb_interface *intf)
 592 {
 593         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 594         struct snd_card *card;
 595         struct list_head *p;
 596
 597         if (chip == (void *)-1L)
 598                 return;
 599
 600         card = chip->card;
 601
 602         mutex_lock(&register_mutex);
 603         if (atomic_inc_return(&chip->shutdown) == 1) {
 604                 struct snd_usb_stream *as;
 605                 struct snd_usb_endpoint *ep;
 606                 struct usb_mixer_interface *mixer;
 607
 608                 /* wait until all pending tasks done;
 609                  * they are protected by snd_usb_lock_shutdown()
 610                  */
 611                 wait_event(chip->shutdown_wait,
 612                            !atomic_read(&chip->usage_count));
 613                 snd_card_disconnect(card);
 614                 /* release the pcm resources */
 615                 list_for_each_entry(as, &chip->pcm_list, list) {
 616                         snd_usb_stream_disconnect(as);
 617                 }
 618                 /* release the endpoint resources */
 619                 list_for_each_entry(ep, &chip->ep_list, list) {
 620                         snd_usb_endpoint_release(ep);
 621                 }
 622                 /* release the midi resources */
 623                 list_for_each(p, &chip->midi_list) {
 624                         snd_usbmidi_disconnect(p);
 625                 }
 626                 /*
 627                  * Nice to check quirk && quirk->media_device
 628                  * need some special handlings. Doesn't look like
 629                  * we have access to quirk here
 630                  * Acceses mixer_list
 631                 */
 632                 media_snd_device_delete(chip);
 633
 634                 /* release mixer resources */
 635                 list_for_each_entry(mixer, &chip->mixer_list, list) {
 636                         snd_usb_mixer_disconnect(mixer);
 637                 }
 638         }
 639
 640         chip->num_interfaces--;
 641         if (chip->num_interfaces <= 0) {
 642                 usb_chip[chip->index] = NULL;
 643                 mutex_unlock(&register_mutex);
 644                 snd_card_free_when_closed(card);
 645         } else {
 646                 mutex_unlock(&register_mutex);
 647         }
 648 }
 649
 650 /* lock the shutdown (disconnect) task and autoresume */
 651 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
 652 {
 653         int err;
 654
 655         atomic_inc(&chip->usage_count);
 656         if (atomic_read(&chip->shutdown)) {
 657                 err = -EIO;
 658                 goto error;
 659         }
 660         err = snd_usb_autoresume(chip);
 661         if (err < 0)
 662                 goto error;
 663         return 0;
 664
 665  error:
 666         if (atomic_dec_and_test(&chip->usage_count))
 667                 wake_up(&chip->shutdown_wait);
 668         return err;
 669 }
 670
 671 /* autosuspend and unlock the shutdown */
 672 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
 673 {
 674         snd_usb_autosuspend(chip);
 675         if (atomic_dec_and_test(&chip->usage_count))
 676                 wake_up(&chip->shutdown_wait);
 677 }
 678
 679 #ifdef CONFIG_PM
 680
 681 int snd_usb_autoresume(struct snd_usb_audio *chip)
 682 {
 683         if (atomic_read(&chip->shutdown))
 684                 return -EIO;
 685         if (atomic_inc_return(&chip->active) == 1)
 686                 return usb_autopm_get_interface(chip->pm_intf);
 687         return 0;
 688 }
 689
 690 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 691 {
 692         if (atomic_read(&chip->shutdown))
 693                 return;
 694         if (atomic_dec_and_test(&chip->active))
 695                 usb_autopm_put_interface(chip->pm_intf);
 696 }
 697
 698 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 699 {
 700         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 701         struct snd_usb_stream *as;
 702         struct usb_mixer_interface *mixer;
 703         struct list_head *p;
 704
 705         if (chip == (void *)-1L)
 706                 return 0;
 707
 708         chip->autosuspended = !!PMSG_IS_AUTO(message);
 709         if (!chip->autosuspended)
 710                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 711         if (!chip->num_suspended_intf++) {
 712                 list_for_each_entry(as, &chip->pcm_list, list) {
 713                         snd_pcm_suspend_all(as->pcm);
 714                         as->substream[0].need_setup_ep =
 715                                 as->substream[1].need_setup_ep = true;
 716                 }
 717                 list_for_each(p, &chip->midi_list)
 718                         snd_usbmidi_suspend(p);
 719                 list_for_each_entry(mixer, &chip->mixer_list, list)
 720                         snd_usb_mixer_suspend(mixer);
 721         }
 722
 723         return 0;
 724 }
 725
 726 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
 727 {
 728         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 729         struct usb_mixer_interface *mixer;
 730         struct list_head *p;
 731         int err = 0;
 732
 733         if (chip == (void *)-1L)
 734                 return 0;
 735         if (--chip->num_suspended_intf)
 736                 return 0;
 737
 738         atomic_inc(&chip->active); /* avoid autopm */
 739         /*
 740          * ALSA leaves material resumption to user space
 741          * we just notify and restart the mixers
 742          */
 743         list_for_each_entry(mixer, &chip->mixer_list, list) {
 744                 err = snd_usb_mixer_resume(mixer, reset_resume);
 745                 if (err < 0)
 746                         goto err_out;
 747         }
 748
 749         list_for_each(p, &chip->midi_list) {
 750                 snd_usbmidi_resume(p);
 751         }
 752
 753         if (!chip->autosuspended)
 754                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 755         chip->autosuspended = 0;
 756
 757 err_out:
 758         atomic_dec(&chip->active); /* allow autopm after this point */
 759         return err;
 760 }
 761
 762 static int usb_audio_resume(struct usb_interface *intf)
 763 {
 764         return __usb_audio_resume(intf, false);
 765 }
 766
 767 static int usb_audio_reset_resume(struct usb_interface *intf)
 768 {
 769         return __usb_audio_resume(intf, true);
 770 }
 771 #else
 772 #define usb_audio_suspend       NULL
 773 #define usb_audio_resume        NULL
 774 #define usb_audio_reset_resume  NULL
 775 #endif          /* CONFIG_PM */
 776
 777 static struct usb_device_id usb_audio_ids [] = {
 778 #include "quirks-table.h"
 779     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 780       .bInterfaceClass = USB_CLASS_AUDIO,
 781       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 782     { }                                         /* Terminating entry */
 783 };
 784 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 785
 786 /*
 787  * entry point for linux usb interface
 788  */
 789
 790 static struct usb_driver usb_audio_driver = {
 791         .name =         "snd-usb-audio",
 792         .probe =        usb_audio_probe,
 793         .disconnect =   usb_audio_disconnect,
 794         .suspend =      usb_audio_suspend,
 795         .resume =       usb_audio_resume,
 796         .reset_resume = usb_audio_reset_resume,
 797         .id_table =     usb_audio_ids,
 798         .supports_autosuspend = 1,
 799 };
 800
 801 module_usb_driver(usb_audio_driver);