sound/usb/card.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   (Tentative) USB Audio Driver for ALSA
   4  *
   5  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   6  *
   7  *   Many codes borrowed from audio.c by
   8  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
   9  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  10  *
  11  *   Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
  12  *
  13  *  NOTES:
  14  *
  15  *   - the linked URBs would be preferred but not used so far because of
  16  *     the instability of unlinking.
  17  *   - type II is not supported properly.  there is no device which supports
  18  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  19  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  20  */
  21
  22
  23 #include <linux/bitops.h>
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/slab.h>
  27 #include <linux/string.h>
  28 #include <linux/ctype.h>
  29 #include <linux/usb.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/mutex.h>
  32 #include <linux/usb/audio.h>
  33 #include <linux/usb/audio-v2.h>
  34 #include <linux/usb/audio-v3.h>
  35 #include <linux/module.h>
  36
  37 #include <sound/control.h>
  38 #include <sound/core.h>
  39 #include <sound/info.h>
  40 #include <sound/pcm.h>
  41 #include <sound/pcm_params.h>
  42 #include <sound/initval.h>
  43
  44 #include "usbaudio.h"
  45 #include "card.h"
  46 #include "midi.h"
  47 #include "midi2.h"
  48 #include "mixer.h"
  49 #include "proc.h"
  50 #include "quirks.h"
  51 #include "endpoint.h"
  52 #include "helper.h"
  53 #include "pcm.h"
  54 #include "format.h"
  55 #include "power.h"
  56 #include "stream.h"
  57 #include "media.h"
  58
  59 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  60 MODULE_DESCRIPTION("USB Audio");
  61 MODULE_LICENSE("GPL");
  62
  63 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  64 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  65 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  66 /* Vendor/product IDs for this card */
  67 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  68 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  69 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  70 static bool ignore_ctl_error;
  71 static bool autoclock = true;
  72 static bool lowlatency = true;
  73 static char *quirk_alias[SNDRV_CARDS];
  74 static char *delayed_register[SNDRV_CARDS];
  75 static bool implicit_fb[SNDRV_CARDS];
  76 static unsigned int quirk_flags[SNDRV_CARDS];
  77
  78 bool snd_usb_use_vmalloc = true;
  79 bool snd_usb_skip_validation;
  80
  81 module_param_array(index, int, NULL, 0444);
  82 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  83 module_param_array(id, charp, NULL, 0444);
  84 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  85 module_param_array(enable, bool, NULL, 0444);
  86 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  87 module_param_array(vid, int, NULL, 0444);
  88 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  89 module_param_array(pid, int, NULL, 0444);
  90 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
  91 module_param_array(device_setup, int, NULL, 0444);
  92 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
  93 module_param(ignore_ctl_error, bool, 0444);
  94 MODULE_PARM_DESC(ignore_ctl_error,
  95                  "Ignore errors from USB controller for mixer interfaces.");
  96 module_param(autoclock, bool, 0444);
  97 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
  98 module_param(lowlatency, bool, 0444);
  99 MODULE_PARM_DESC(lowlatency, "Enable low latency playback (default: yes).");
 100 module_param_array(quirk_alias, charp, NULL, 0444);
 101 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
 102 module_param_array(delayed_register, charp, NULL, 0444);
 103 MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
 104 module_param_array(implicit_fb, bool, NULL, 0444);
 105 MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
 106 module_param_array(quirk_flags, uint, NULL, 0444);
 107 MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
 108 module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
 109 MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
 110 module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
 111 MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
 112
 113 /*
 114  * we keep the snd_usb_audio_t instances by ourselves for merging
 115  * the all interfaces on the same card as one sound device.
 116  */
 117
 118 static DEFINE_MUTEX(register_mutex);
 119 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 120 static struct usb_driver usb_audio_driver;
 121
 122 /*
 123  * disconnect streams
 124  * called from usb_audio_disconnect()
 125  */
 126 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
 127 {
 128         int idx;
 129         struct snd_usb_substream *subs;
 130
 131         for (idx = 0; idx < 2; idx++) {
 132                 subs = &as->substream[idx];
 133                 if (!subs->num_formats)
 134                         continue;
 135                 subs->data_endpoint = NULL;
 136                 subs->sync_endpoint = NULL;
 137         }
 138 }
 139
 140 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 141 {
 142         struct usb_device *dev = chip->dev;
 143         struct usb_host_interface *alts;
 144         struct usb_interface_descriptor *altsd;
 145         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 146
 147         if (!iface) {
 148                 dev_err(&dev->dev, "%u:%d : does not exist\n",
 149                         ctrlif, interface);
 150                 return -EINVAL;
 151         }
 152
 153         alts = &iface->altsetting[0];
 154         altsd = get_iface_desc(alts);
 155
 156         /*
 157          * Android with both accessory and audio interfaces enabled gets the
 158          * interface numbers wrong.
 159          */
 160         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 161              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 162             interface == 0 &&
 163             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 164             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 165                 interface = 2;
 166                 iface = usb_ifnum_to_if(dev, interface);
 167                 if (!iface)
 168                         return -EINVAL;
 169                 alts = &iface->altsetting[0];
 170                 altsd = get_iface_desc(alts);
 171         }
 172
 173         if (usb_interface_claimed(iface)) {
 174                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
 175                         ctrlif, interface);
 176                 return -EINVAL;
 177         }
 178
 179         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 180              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 181             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 182                 int err = snd_usb_midi_v2_create(chip, iface, NULL,
 183                                                  chip->usb_id);
 184                 if (err < 0) {
 185                         dev_err(&dev->dev,
 186                                 "%u:%d: cannot create sequencer device\n",
 187                                 ctrlif, interface);
 188                         return -EINVAL;
 189                 }
 190                 return usb_driver_claim_interface(&usb_audio_driver, iface,
 191                                                   USB_AUDIO_IFACE_UNUSED);
 192         }
 193
 194         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 195              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 196             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 197                 dev_dbg(&dev->dev,
 198                         "%u:%d: skipping non-supported interface %d\n",
 199                         ctrlif, interface, altsd->bInterfaceClass);
 200                 /* skip non-supported classes */
 201                 return -EINVAL;
 202         }
 203
 204         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 205                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
 206                 return -EINVAL;
 207         }
 208
 209         snd_usb_add_ctrl_interface_link(chip, interface, ctrlif);
 210
 211         if (! snd_usb_parse_audio_interface(chip, interface)) {
 212                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 213                 return usb_driver_claim_interface(&usb_audio_driver, iface,
 214                                                   USB_AUDIO_IFACE_UNUSED);
 215         }
 216
 217         return 0;
 218 }
 219
 220 /*
 221  * parse audio control descriptor and create pcm/midi streams
 222  */
 223 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 224 {
 225         struct usb_device *dev = chip->dev;
 226         struct usb_host_interface *host_iface;
 227         struct usb_interface_descriptor *altsd;
 228         int i, protocol;
 229
 230         /* find audiocontrol interface */
 231         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 232         altsd = get_iface_desc(host_iface);
 233         protocol = altsd->bInterfaceProtocol;
 234
 235         switch (protocol) {
 236         default:
 237                 dev_warn(&dev->dev,
 238                          "unknown interface protocol %#02x, assuming v1\n",
 239                          protocol);
 240                 fallthrough;
 241
 242         case UAC_VERSION_1: {
 243                 struct uac1_ac_header_descriptor *h1;
 244                 int rest_bytes;
 245
 246                 h1 = snd_usb_find_csint_desc(host_iface->extra,
 247                                                          host_iface->extralen,
 248                                                          NULL, UAC_HEADER);
 249                 if (!h1 || h1->bLength < sizeof(*h1)) {
 250                         dev_err(&dev->dev, "cannot find UAC_HEADER\n");
 251                         return -EINVAL;
 252                 }
 253
 254                 rest_bytes = (void *)(host_iface->extra +
 255                                 host_iface->extralen) - (void *)h1;
 256
 257                 /* just to be sure -- this shouldn't hit at all */
 258                 if (rest_bytes <= 0) {
 259                         dev_err(&dev->dev, "invalid control header\n");
 260                         return -EINVAL;
 261                 }
 262
 263                 if (rest_bytes < sizeof(*h1)) {
 264                         dev_err(&dev->dev, "too short v1 buffer descriptor\n");
 265                         return -EINVAL;
 266                 }
 267
 268                 if (!h1->bInCollection) {
 269                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
 270                         return -EINVAL;
 271                 }
 272
 273                 if (rest_bytes < h1->bLength) {
 274                         dev_err(&dev->dev, "invalid buffer length (v1)\n");
 275                         return -EINVAL;
 276                 }
 277
 278                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 279                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
 280                         return -EINVAL;
 281                 }
 282
 283                 for (i = 0; i < h1->bInCollection; i++)
 284                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 285
 286                 break;
 287         }
 288
 289         case UAC_VERSION_2:
 290         case UAC_VERSION_3: {
 291                 struct usb_interface_assoc_descriptor *assoc =
 292                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 293
 294                 if (!assoc) {
 295                         /*
 296                          * Firmware writers cannot count to three.  So to find
 297                          * the IAD on the NuForce UDH-100, also check the next
 298                          * interface.
 299                          */
 300                         struct usb_interface *iface =
 301                                 usb_ifnum_to_if(dev, ctrlif + 1);
 302                         if (iface &&
 303                             iface->intf_assoc &&
 304                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 305                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 306                                 assoc = iface->intf_assoc;
 307                 }
 308
 309                 if (!assoc) {
 310                         dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
 311                         return -EINVAL;
 312                 }
 313
 314                 if (protocol == UAC_VERSION_3) {
 315                         int badd = assoc->bFunctionSubClass;
 316
 317                         if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
 318                             (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
 319                              badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
 320                                 dev_err(&dev->dev,
 321                                         "Unsupported UAC3 BADD profile\n");
 322                                 return -EINVAL;
 323                         }
 324
 325                         chip->badd_profile = badd;
 326                 }
 327
 328                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 329                         int intf = assoc->bFirstInterface + i;
 330
 331                         if (intf != ctrlif)
 332                                 snd_usb_create_stream(chip, ctrlif, intf);
 333                 }
 334
 335                 break;
 336         }
 337         }
 338
 339         return 0;
 340 }
 341
 342 /*
 343  * Profile name preset table
 344  */
 345 struct usb_audio_device_name {
 346         u32 id;
 347         const char *vendor_name;
 348         const char *product_name;
 349         const char *profile_name;       /* override card->longname */
 350 };
 351
 352 #define PROFILE_NAME(vid, pid, vendor, product, profile)         \
 353         { .id = USB_ID(vid, pid), .vendor_name = (vendor),       \
 354           .product_name = (product), .profile_name = (profile) }
 355 #define DEVICE_NAME(vid, pid, vendor, product) \
 356         PROFILE_NAME(vid, pid, vendor, product, NULL)
 357
 358 /* vendor/product and profile name presets, sorted in device id order */
 359 static const struct usb_audio_device_name usb_audio_names[] = {
 360         /* HP Thunderbolt Dock Audio Headset */
 361         PROFILE_NAME(0x03f0, 0x0269, "HP", "Thunderbolt Dock Audio Headset",
 362                      "HP-Thunderbolt-Dock-Audio-Headset"),
 363         /* HP Thunderbolt Dock Audio Module */
 364         PROFILE_NAME(0x03f0, 0x0567, "HP", "Thunderbolt Dock Audio Module",
 365                      "HP-Thunderbolt-Dock-Audio-Module"),
 366
 367         /* Two entries for Gigabyte TRX40 Aorus Master:
 368          * TRX40 Aorus Master has two USB-audio devices, one for the front
 369          * headphone with ESS SABRE9218 DAC chip, while another for the rest
 370          * I/O (the rear panel and the front mic) with Realtek ALC1220-VB.
 371          * Here we provide two distinct names for making UCM profiles easier.
 372          */
 373         PROFILE_NAME(0x0414, 0xa000, "Gigabyte", "Aorus Master Front Headphone",
 374                      "Gigabyte-Aorus-Master-Front-Headphone"),
 375         PROFILE_NAME(0x0414, 0xa001, "Gigabyte", "Aorus Master Main Audio",
 376                      "Gigabyte-Aorus-Master-Main-Audio"),
 377
 378         /* Gigabyte TRX40 Aorus Pro WiFi */
 379         PROFILE_NAME(0x0414, 0xa002,
 380                      "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
 381
 382         /* Creative/E-Mu devices */
 383         DEVICE_NAME(0x041e, 0x3010, "Creative Labs", "Sound Blaster MP3+"),
 384         /* Creative/Toshiba Multimedia Center SB-0500 */
 385         DEVICE_NAME(0x041e, 0x3048, "Toshiba", "SB-0500"),
 386
 387         /* Logitech Audio Devices */
 388         DEVICE_NAME(0x046d, 0x0867, "Logitech, Inc.", "Logi-MeetUp"),
 389         DEVICE_NAME(0x046d, 0x0874, "Logitech, Inc.", "Logi-Tap-Audio"),
 390         DEVICE_NAME(0x046d, 0x087c, "Logitech, Inc.", "Logi-Huddle"),
 391         DEVICE_NAME(0x046d, 0x0898, "Logitech, Inc.", "Logi-RB-Audio"),
 392         DEVICE_NAME(0x046d, 0x08d2, "Logitech, Inc.", "Logi-RBM-Audio"),
 393         DEVICE_NAME(0x046d, 0x0990, "Logitech, Inc.", "QuickCam Pro 9000"),
 394
 395         DEVICE_NAME(0x05e1, 0x0408, "Syntek", "STK1160"),
 396         DEVICE_NAME(0x05e1, 0x0480, "Hauppauge", "Woodbury"),
 397
 398         /* ASUS ROG Zenith II: this machine has also two devices, one for
 399          * the front headphone and another for the rest
 400          */
 401         PROFILE_NAME(0x0b05, 0x1915, "ASUS", "Zenith II Front Headphone",
 402                      "Zenith-II-Front-Headphone"),
 403         PROFILE_NAME(0x0b05, 0x1916, "ASUS", "Zenith II Main Audio",
 404                      "Zenith-II-Main-Audio"),
 405
 406         /* ASUS ROG Strix */
 407         PROFILE_NAME(0x0b05, 0x1917,
 408                      "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
 409         /* ASUS PRIME TRX40 PRO-S */
 410         PROFILE_NAME(0x0b05, 0x1918,
 411                      "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
 412
 413         /* Dell WD15 Dock */
 414         PROFILE_NAME(0x0bda, 0x4014, "Dell", "WD15 Dock", "Dell-WD15-Dock"),
 415         /* Dell WD19 Dock */
 416         PROFILE_NAME(0x0bda, 0x402e, "Dell", "WD19 Dock", "Dell-WD15-Dock"),
 417
 418         DEVICE_NAME(0x0ccd, 0x0028, "TerraTec", "Aureon5.1MkII"),
 419
 420         /*
 421          * The original product_name is "USB Sound Device", however this name
 422          * is also used by the CM106 based cards, so make it unique.
 423          */
 424         DEVICE_NAME(0x0d8c, 0x0102, NULL, "ICUSBAUDIO7D"),
 425         DEVICE_NAME(0x0d8c, 0x0103, NULL, "Audio Advantage MicroII"),
 426
 427         /* MSI TRX40 Creator */
 428         PROFILE_NAME(0x0db0, 0x0d64,
 429                      "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
 430         /* MSI TRX40 */
 431         PROFILE_NAME(0x0db0, 0x543d,
 432                      "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
 433
 434         DEVICE_NAME(0x0fd9, 0x0008, "Hauppauge", "HVR-950Q"),
 435
 436         /* Dock/Stand for HP Engage Go */
 437         PROFILE_NAME(0x103c, 0x830a, "HP", "HP Engage Go Dock",
 438                      "HP-Engage-Go-Dock"),
 439
 440         /* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */
 441         DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"),
 442         DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
 443
 444         /* aka. Serato Scratch Live DJ Box */
 445         DEVICE_NAME(0x13e5, 0x0001, "Rane", "SL-1"),
 446
 447         /* Lenovo ThinkStation P620 Rear Line-in, Line-out and Microphone */
 448         PROFILE_NAME(0x17aa, 0x1046, "Lenovo", "ThinkStation P620 Rear",
 449                      "Lenovo-ThinkStation-P620-Rear"),
 450         /* Lenovo ThinkStation P620 Internal Speaker + Front Headset */
 451         PROFILE_NAME(0x17aa, 0x104d, "Lenovo", "ThinkStation P620 Main",
 452                      "Lenovo-ThinkStation-P620-Main"),
 453
 454         /* Asrock TRX40 Creator */
 455         PROFILE_NAME(0x26ce, 0x0a01,
 456                      "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
 457
 458         DEVICE_NAME(0x2040, 0x7200, "Hauppauge", "HVR-950Q"),
 459         DEVICE_NAME(0x2040, 0x7201, "Hauppauge", "HVR-950Q-MXL"),
 460         DEVICE_NAME(0x2040, 0x7210, "Hauppauge", "HVR-950Q"),
 461         DEVICE_NAME(0x2040, 0x7211, "Hauppauge", "HVR-950Q-MXL"),
 462         DEVICE_NAME(0x2040, 0x7213, "Hauppauge", "HVR-950Q"),
 463         DEVICE_NAME(0x2040, 0x7217, "Hauppauge", "HVR-950Q"),
 464         DEVICE_NAME(0x2040, 0x721b, "Hauppauge", "HVR-950Q"),
 465         DEVICE_NAME(0x2040, 0x721e, "Hauppauge", "HVR-950Q"),
 466         DEVICE_NAME(0x2040, 0x721f, "Hauppauge", "HVR-950Q"),
 467         DEVICE_NAME(0x2040, 0x7240, "Hauppauge", "HVR-850"),
 468         DEVICE_NAME(0x2040, 0x7260, "Hauppauge", "HVR-950Q"),
 469         DEVICE_NAME(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
 470         DEVICE_NAME(0x2040, 0x7280, "Hauppauge", "HVR-950Q"),
 471         DEVICE_NAME(0x2040, 0x7281, "Hauppauge", "HVR-950Q-MXL"),
 472         DEVICE_NAME(0x2040, 0x8200, "Hauppauge", "Woodbury"),
 473
 474         { } /* terminator */
 475 };
 476
 477 static const struct usb_audio_device_name *
 478 lookup_device_name(u32 id)
 479 {
 480         static const struct usb_audio_device_name *p;
 481
 482         for (p = usb_audio_names; p->id; p++)
 483                 if (p->id == id)
 484                         return p;
 485         return NULL;
 486 }
 487
 488 /*
 489  * free the chip instance
 490  *
 491  * here we have to do not much, since pcm and controls are already freed
 492  *
 493  */
 494
 495 static void snd_usb_audio_free(struct snd_card *card)
 496 {
 497         struct snd_usb_audio *chip = card->private_data;
 498
 499         snd_usb_endpoint_free_all(chip);
 500         snd_usb_midi_v2_free_all(chip);
 501
 502         mutex_destroy(&chip->mutex);
 503         if (!atomic_read(&chip->shutdown))
 504                 dev_set_drvdata(&chip->dev->dev, NULL);
 505 }
 506
 507 static void usb_audio_make_shortname(struct usb_device *dev,
 508                                      struct snd_usb_audio *chip,
 509                                      const struct snd_usb_audio_quirk *quirk)
 510 {
 511         struct snd_card *card = chip->card;
 512         const struct usb_audio_device_name *preset;
 513         const char *s = NULL;
 514
 515         preset = lookup_device_name(chip->usb_id);
 516         if (preset && preset->product_name)
 517                 s = preset->product_name;
 518         else if (quirk && quirk->product_name)
 519                 s = quirk->product_name;
 520         if (s && *s) {
 521                 strscpy(card->shortname, s, sizeof(card->shortname));
 522                 return;
 523         }
 524
 525         /* retrieve the device string as shortname */
 526         if (!dev->descriptor.iProduct ||
 527             usb_string(dev, dev->descriptor.iProduct,
 528                        card->shortname, sizeof(card->shortname)) <= 0) {
 529                 /* no name available from anywhere, so use ID */
 530                 sprintf(card->shortname, "USB Device %#04x:%#04x",
 531                         USB_ID_VENDOR(chip->usb_id),
 532                         USB_ID_PRODUCT(chip->usb_id));
 533         }
 534
 535         strim(card->shortname);
 536 }
 537
 538 static void usb_audio_make_longname(struct usb_device *dev,
 539                                     struct snd_usb_audio *chip,
 540                                     const struct snd_usb_audio_quirk *quirk)
 541 {
 542         struct snd_card *card = chip->card;
 543         const struct usb_audio_device_name *preset;
 544         const char *s = NULL;
 545         int len;
 546
 547         preset = lookup_device_name(chip->usb_id);
 548
 549         /* shortcut - if any pre-defined string is given, use it */
 550         if (preset && preset->profile_name)
 551                 s = preset->profile_name;
 552         if (s && *s) {
 553                 strscpy(card->longname, s, sizeof(card->longname));
 554                 return;
 555         }
 556
 557         if (preset && preset->vendor_name)
 558                 s = preset->vendor_name;
 559         else if (quirk && quirk->vendor_name)
 560                 s = quirk->vendor_name;
 561         *card->longname = 0;
 562         if (s && *s) {
 563                 strscpy(card->longname, s, sizeof(card->longname));
 564         } else {
 565                 /* retrieve the vendor and device strings as longname */
 566                 if (dev->descriptor.iManufacturer)
 567                         usb_string(dev, dev->descriptor.iManufacturer,
 568                                    card->longname, sizeof(card->longname));
 569                 /* we don't really care if there isn't any vendor string */
 570         }
 571         if (*card->longname) {
 572                 strim(card->longname);
 573                 if (*card->longname)
 574                         strlcat(card->longname, " ", sizeof(card->longname));
 575         }
 576
 577         strlcat(card->longname, card->shortname, sizeof(card->longname));
 578
 579         len = strlcat(card->longname, " at ", sizeof(card->longname));
 580
 581         if (len < sizeof(card->longname))
 582                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 583
 584         switch (snd_usb_get_speed(dev)) {
 585         case USB_SPEED_LOW:
 586                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 587                 break;
 588         case USB_SPEED_FULL:
 589                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 590                 break;
 591         case USB_SPEED_HIGH:
 592                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 593                 break;
 594         case USB_SPEED_SUPER:
 595                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 596                 break;
 597         case USB_SPEED_SUPER_PLUS:
 598                 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
 599                 break;
 600         default:
 601                 break;
 602         }
 603 }
 604
 605 /*
 606  * create a chip instance and set its names.
 607  */
 608 static int snd_usb_audio_create(struct usb_interface *intf,
 609                                 struct usb_device *dev, int idx,
 610                                 const struct snd_usb_audio_quirk *quirk,
 611                                 unsigned int usb_id,
 612                                 struct snd_usb_audio **rchip)
 613 {
 614         struct snd_card *card;
 615         struct snd_usb_audio *chip;
 616         int err;
 617         char component[14];
 618
 619         *rchip = NULL;
 620
 621         switch (snd_usb_get_speed(dev)) {
 622         case USB_SPEED_LOW:
 623         case USB_SPEED_FULL:
 624         case USB_SPEED_HIGH:
 625         case USB_SPEED_SUPER:
 626         case USB_SPEED_SUPER_PLUS:
 627                 break;
 628         default:
 629                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
 630                 return -ENXIO;
 631         }
 632
 633         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
 634                            sizeof(*chip), &card);
 635         if (err < 0) {
 636                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
 637                 return err;
 638         }
 639
 640         chip = card->private_data;
 641         mutex_init(&chip->mutex);
 642         init_waitqueue_head(&chip->shutdown_wait);
 643         chip->index = idx;
 644         chip->dev = dev;
 645         chip->card = card;
 646         chip->setup = device_setup[idx];
 647         chip->generic_implicit_fb = implicit_fb[idx];
 648         chip->autoclock = autoclock;
 649         chip->lowlatency = lowlatency;
 650         atomic_set(&chip->active, 1); /* avoid autopm during probing */
 651         atomic_set(&chip->usage_count, 0);
 652         atomic_set(&chip->shutdown, 0);
 653
 654         chip->usb_id = usb_id;
 655         INIT_LIST_HEAD(&chip->pcm_list);
 656         INIT_LIST_HEAD(&chip->ep_list);
 657         INIT_LIST_HEAD(&chip->iface_ref_list);
 658         INIT_LIST_HEAD(&chip->clock_ref_list);
 659         INIT_LIST_HEAD(&chip->midi_list);
 660         INIT_LIST_HEAD(&chip->midi_v2_list);
 661         INIT_LIST_HEAD(&chip->mixer_list);
 662
 663         if (quirk_flags[idx])
 664                 chip->quirk_flags = quirk_flags[idx];
 665         else
 666                 snd_usb_init_quirk_flags(chip);
 667
 668         card->private_free = snd_usb_audio_free;
 669
 670         strcpy(card->driver, "USB-Audio");
 671         sprintf(component, "USB%04x:%04x",
 672                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 673         snd_component_add(card, component);
 674
 675         usb_audio_make_shortname(dev, chip, quirk);
 676         usb_audio_make_longname(dev, chip, quirk);
 677
 678         snd_usb_audio_create_proc(chip);
 679
 680         *rchip = chip;
 681         return 0;
 682 }
 683
 684 /* look for a matching quirk alias id */
 685 static bool get_alias_id(struct usb_device *dev, unsigned int *id)
 686 {
 687         int i;
 688         unsigned int src, dst;
 689
 690         for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
 691                 if (!quirk_alias[i] ||
 692                     sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
 693                     src != *id)
 694                         continue;
 695                 dev_info(&dev->dev,
 696                          "device (%04x:%04x): applying quirk alias %04x:%04x\n",
 697                          USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
 698                          USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
 699                 *id = dst;
 700                 return true;
 701         }
 702
 703         return false;
 704 }
 705
 706 static int check_delayed_register_option(struct snd_usb_audio *chip)
 707 {
 708         int i;
 709         unsigned int id, inum;
 710
 711         for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
 712                 if (delayed_register[i] &&
 713                     sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
 714                     id == chip->usb_id)
 715                         return inum;
 716         }
 717
 718         return -1;
 719 }
 720
 721 static const struct usb_device_id usb_audio_ids[]; /* defined below */
 722
 723 /* look for the last interface that matches with our ids and remember it */
 724 static void find_last_interface(struct snd_usb_audio *chip)
 725 {
 726         struct usb_host_config *config = chip->dev->actconfig;
 727         struct usb_interface *intf;
 728         int i;
 729
 730         if (!config)
 731                 return;
 732         for (i = 0; i < config->desc.bNumInterfaces; i++) {
 733                 intf = config->interface[i];
 734                 if (usb_match_id(intf, usb_audio_ids))
 735                         chip->last_iface = intf->altsetting[0].desc.bInterfaceNumber;
 736         }
 737         usb_audio_dbg(chip, "Found last interface = %d\n", chip->last_iface);
 738 }
 739
 740 /* look for the corresponding quirk */
 741 static const struct snd_usb_audio_quirk *
 742 get_alias_quirk(struct usb_device *dev, unsigned int id)
 743 {
 744         const struct usb_device_id *p;
 745
 746         for (p = usb_audio_ids; p->match_flags; p++) {
 747                 /* FIXME: this checks only vendor:product pair in the list */
 748                 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
 749                     USB_DEVICE_ID_MATCH_DEVICE &&
 750                     p->idVendor == USB_ID_VENDOR(id) &&
 751                     p->idProduct == USB_ID_PRODUCT(id))
 752                         return (const struct snd_usb_audio_quirk *)p->driver_info;
 753         }
 754
 755         return NULL;
 756 }
 757
 758 /* register card if we reach to the last interface or to the specified
 759  * one given via option
 760  */
 761 static int try_to_register_card(struct snd_usb_audio *chip, int ifnum)
 762 {
 763         if (check_delayed_register_option(chip) == ifnum ||
 764             chip->last_iface == ifnum ||
 765             usb_interface_claimed(usb_ifnum_to_if(chip->dev, chip->last_iface)))
 766                 return snd_card_register(chip->card);
 767         return 0;
 768 }
 769
 770 /*
 771  * probe the active usb device
 772  *
 773  * note that this can be called multiple times per a device, when it
 774  * includes multiple audio control interfaces.
 775  *
 776  * thus we check the usb device pointer and creates the card instance
 777  * only at the first time.  the successive calls of this function will
 778  * append the pcm interface to the corresponding card.
 779  */
 780 static int usb_audio_probe(struct usb_interface *intf,
 781                            const struct usb_device_id *usb_id)
 782 {
 783         struct usb_device *dev = interface_to_usbdev(intf);
 784         const struct snd_usb_audio_quirk *quirk =
 785                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 786         struct snd_usb_audio *chip;
 787         int i, err;
 788         struct usb_host_interface *alts;
 789         int ifnum;
 790         u32 id;
 791
 792         alts = &intf->altsetting[0];
 793         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 794         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 795                     le16_to_cpu(dev->descriptor.idProduct));
 796         if (get_alias_id(dev, &id))
 797                 quirk = get_alias_quirk(dev, id);
 798         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 799                 return -ENXIO;
 800         if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
 801                 return -ENODEV;
 802
 803         err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
 804         if (err < 0)
 805                 return err;
 806
 807         /*
 808          * found a config.  now register to ALSA
 809          */
 810
 811         /* check whether it's already registered */
 812         chip = NULL;
 813         mutex_lock(&register_mutex);
 814         for (i = 0; i < SNDRV_CARDS; i++) {
 815                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 816                         if (atomic_read(&usb_chip[i]->shutdown)) {
 817                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
 818                                 err = -EIO;
 819                                 goto __error;
 820                         }
 821                         chip = usb_chip[i];
 822                         atomic_inc(&chip->active); /* avoid autopm */
 823                         break;
 824                 }
 825         }
 826         if (! chip) {
 827                 err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
 828                 if (err < 0)
 829                         goto __error;
 830
 831                 /* it's a fresh one.
 832                  * now look for an empty slot and create a new card instance
 833                  */
 834                 for (i = 0; i < SNDRV_CARDS; i++)
 835                         if (!usb_chip[i] &&
 836                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 837                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 838                                 if (enable[i]) {
 839                                         err = snd_usb_audio_create(intf, dev, i, quirk,
 840                                                                    id, &chip);
 841                                         if (err < 0)
 842                                                 goto __error;
 843                                         break;
 844                                 } else if (vid[i] != -1 || pid[i] != -1) {
 845                                         dev_info(&dev->dev,
 846                                                  "device (%04x:%04x) is disabled\n",
 847                                                  USB_ID_VENDOR(id),
 848                                                  USB_ID_PRODUCT(id));
 849                                         err = -ENOENT;
 850                                         goto __error;
 851                                 }
 852                         }
 853                 if (!chip) {
 854                         dev_err(&dev->dev, "no available usb audio device\n");
 855                         err = -ENODEV;
 856                         goto __error;
 857                 }
 858                 find_last_interface(chip);
 859         }
 860
 861         if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
 862                 dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
 863                 err = -EINVAL;
 864                 goto __error;
 865         }
 866
 867         dev_set_drvdata(&dev->dev, chip);
 868
 869         if (ignore_ctl_error)
 870                 chip->quirk_flags |= QUIRK_FLAG_IGNORE_CTL_ERROR;
 871
 872         if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
 873                 usb_disable_autosuspend(interface_to_usbdev(intf));
 874
 875         /*
 876          * For devices with more than one control interface, we assume the
 877          * first contains the audio controls. We might need a more specific
 878          * check here in the future.
 879          */
 880         if (!chip->ctrl_intf)
 881                 chip->ctrl_intf = alts;
 882
 883         err = 1; /* continue */
 884         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 885                 /* need some special handlings */
 886                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
 887                 if (err < 0)
 888                         goto __error;
 889         }
 890
 891         if (err > 0) {
 892                 /* create normal USB audio interfaces */
 893                 err = snd_usb_create_streams(chip, ifnum);
 894                 if (err < 0)
 895                         goto __error;
 896                 err = snd_usb_create_mixer(chip, ifnum);
 897                 if (err < 0)
 898                         goto __error;
 899         }
 900
 901         if (chip->need_delayed_register) {
 902                 dev_info(&dev->dev,
 903                          "Found post-registration device assignment: %08x:%02x\n",
 904                          chip->usb_id, ifnum);
 905                 chip->need_delayed_register = false; /* clear again */
 906         }
 907
 908         err = try_to_register_card(chip, ifnum);
 909         if (err < 0)
 910                 goto __error_no_register;
 911
 912         if (chip->quirk_flags & QUIRK_FLAG_SHARE_MEDIA_DEVICE) {
 913                 /* don't want to fail when snd_media_device_create() fails */
 914                 snd_media_device_create(chip, intf);
 915         }
 916
 917         if (quirk)
 918                 chip->quirk_type = quirk->type;
 919
 920         usb_chip[chip->index] = chip;
 921         chip->intf[chip->num_interfaces] = intf;
 922         chip->num_interfaces++;
 923         usb_set_intfdata(intf, chip);
 924         atomic_dec(&chip->active);
 925         mutex_unlock(&register_mutex);
 926         return 0;
 927
 928  __error:
 929         /* in the case of error in secondary interface, still try to register */
 930         if (chip)
 931                 try_to_register_card(chip, ifnum);
 932
 933  __error_no_register:
 934         if (chip) {
 935                 /* chip->active is inside the chip->card object,
 936                  * decrement before memory is possibly returned.
 937                  */
 938                 atomic_dec(&chip->active);
 939                 if (!chip->num_interfaces)
 940                         snd_card_free(chip->card);
 941         }
 942         mutex_unlock(&register_mutex);
 943         return err;
 944 }
 945
 946 /*
 947  * we need to take care of counter, since disconnection can be called also
 948  * many times as well as usb_audio_probe().
 949  */
 950 static void usb_audio_disconnect(struct usb_interface *intf)
 951 {
 952         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 953         struct snd_card *card;
 954         struct list_head *p;
 955
 956         if (chip == USB_AUDIO_IFACE_UNUSED)
 957                 return;
 958
 959         card = chip->card;
 960
 961         mutex_lock(&register_mutex);
 962         if (atomic_inc_return(&chip->shutdown) == 1) {
 963                 struct snd_usb_stream *as;
 964                 struct snd_usb_endpoint *ep;
 965                 struct usb_mixer_interface *mixer;
 966
 967                 /* wait until all pending tasks done;
 968                  * they are protected by snd_usb_lock_shutdown()
 969                  */
 970                 wait_event(chip->shutdown_wait,
 971                            !atomic_read(&chip->usage_count));
 972                 snd_card_disconnect(card);
 973                 /* release the pcm resources */
 974                 list_for_each_entry(as, &chip->pcm_list, list) {
 975                         snd_usb_stream_disconnect(as);
 976                 }
 977                 /* release the endpoint resources */
 978                 list_for_each_entry(ep, &chip->ep_list, list) {
 979                         snd_usb_endpoint_release(ep);
 980                 }
 981                 /* release the midi resources */
 982                 list_for_each(p, &chip->midi_list) {
 983                         snd_usbmidi_disconnect(p);
 984                 }
 985                 snd_usb_midi_v2_disconnect_all(chip);
 986                 /*
 987                  * Nice to check quirk && quirk->shares_media_device and
 988                  * then call the snd_media_device_delete(). Don't have
 989                  * access to the quirk here. snd_media_device_delete()
 990                  * accesses mixer_list
 991                  */
 992                 snd_media_device_delete(chip);
 993
 994                 /* release mixer resources */
 995                 list_for_each_entry(mixer, &chip->mixer_list, list) {
 996                         snd_usb_mixer_disconnect(mixer);
 997                 }
 998         }
 999
1000         if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
1001                 usb_enable_autosuspend(interface_to_usbdev(intf));
1002
1003         chip->num_interfaces--;
1004         if (chip->num_interfaces <= 0) {
1005                 usb_chip[chip->index] = NULL;
1006                 mutex_unlock(&register_mutex);
1007                 snd_card_free_when_closed(card);
1008         } else {
1009                 mutex_unlock(&register_mutex);
1010         }
1011 }
1012
1013 /* lock the shutdown (disconnect) task and autoresume */
1014 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
1015 {
1016         int err;
1017
1018         atomic_inc(&chip->usage_count);
1019         if (atomic_read(&chip->shutdown)) {
1020                 err = -EIO;
1021                 goto error;
1022         }
1023         err = snd_usb_autoresume(chip);
1024         if (err < 0)
1025                 goto error;
1026         return 0;
1027
1028  error:
1029         if (atomic_dec_and_test(&chip->usage_count))
1030                 wake_up(&chip->shutdown_wait);
1031         return err;
1032 }
1033
1034 /* autosuspend and unlock the shutdown */
1035 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
1036 {
1037         snd_usb_autosuspend(chip);
1038         if (atomic_dec_and_test(&chip->usage_count))
1039                 wake_up(&chip->shutdown_wait);
1040 }
1041
1042 int snd_usb_autoresume(struct snd_usb_audio *chip)
1043 {
1044         int i, err;
1045
1046         if (atomic_read(&chip->shutdown))
1047                 return -EIO;
1048         if (atomic_inc_return(&chip->active) != 1)
1049                 return 0;
1050
1051         for (i = 0; i < chip->num_interfaces; i++) {
1052                 err = usb_autopm_get_interface(chip->intf[i]);
1053                 if (err < 0) {
1054                         /* rollback */
1055                         while (--i >= 0)
1056                                 usb_autopm_put_interface(chip->intf[i]);
1057                         atomic_dec(&chip->active);
1058                         return err;
1059                 }
1060         }
1061         return 0;
1062 }
1063
1064 void snd_usb_autosuspend(struct snd_usb_audio *chip)
1065 {
1066         int i;
1067
1068         if (atomic_read(&chip->shutdown))
1069                 return;
1070         if (!atomic_dec_and_test(&chip->active))
1071                 return;
1072
1073         for (i = 0; i < chip->num_interfaces; i++)
1074                 usb_autopm_put_interface(chip->intf[i]);
1075 }
1076
1077 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
1078 {
1079         struct snd_usb_audio *chip = usb_get_intfdata(intf);
1080         struct snd_usb_stream *as;
1081         struct snd_usb_endpoint *ep;
1082         struct usb_mixer_interface *mixer;
1083         struct list_head *p;
1084
1085         if (chip == USB_AUDIO_IFACE_UNUSED)
1086                 return 0;
1087
1088         if (!chip->num_suspended_intf++) {
1089                 list_for_each_entry(as, &chip->pcm_list, list)
1090                         snd_usb_pcm_suspend(as);
1091                 list_for_each_entry(ep, &chip->ep_list, list)
1092                         snd_usb_endpoint_suspend(ep);
1093                 list_for_each(p, &chip->midi_list)
1094                         snd_usbmidi_suspend(p);
1095                 list_for_each_entry(mixer, &chip->mixer_list, list)
1096                         snd_usb_mixer_suspend(mixer);
1097                 snd_usb_midi_v2_suspend_all(chip);
1098         }
1099
1100         if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
1101                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
1102                 chip->system_suspend = chip->num_suspended_intf;
1103         }
1104
1105         return 0;
1106 }
1107
1108 static int usb_audio_resume(struct usb_interface *intf)
1109 {
1110         struct snd_usb_audio *chip = usb_get_intfdata(intf);
1111         struct snd_usb_stream *as;
1112         struct usb_mixer_interface *mixer;
1113         struct list_head *p;
1114         int err = 0;
1115
1116         if (chip == USB_AUDIO_IFACE_UNUSED)
1117                 return 0;
1118
1119         atomic_inc(&chip->active); /* avoid autopm */
1120         if (chip->num_suspended_intf > 1)
1121                 goto out;
1122
1123         list_for_each_entry(as, &chip->pcm_list, list) {
1124                 err = snd_usb_pcm_resume(as);
1125                 if (err < 0)
1126                         goto err_out;
1127         }
1128
1129         /*
1130          * ALSA leaves material resumption to user space
1131          * we just notify and restart the mixers
1132          */
1133         list_for_each_entry(mixer, &chip->mixer_list, list) {
1134                 err = snd_usb_mixer_resume(mixer);
1135                 if (err < 0)
1136                         goto err_out;
1137         }
1138
1139         list_for_each(p, &chip->midi_list) {
1140                 snd_usbmidi_resume(p);
1141         }
1142
1143         snd_usb_midi_v2_resume_all(chip);
1144
1145  out:
1146         if (chip->num_suspended_intf == chip->system_suspend) {
1147                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
1148                 chip->system_suspend = 0;
1149         }
1150         chip->num_suspended_intf--;
1151
1152 err_out:
1153         atomic_dec(&chip->active); /* allow autopm after this point */
1154         return err;
1155 }
1156
1157 static const struct usb_device_id usb_audio_ids [] = {
1158 #include "quirks-table.h"
1159     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
1160       .bInterfaceClass = USB_CLASS_AUDIO,
1161       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
1162     { }                                         /* Terminating entry */
1163 };
1164 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
1165
1166 /*
1167  * entry point for linux usb interface
1168  */
1169
1170 static struct usb_driver usb_audio_driver = {
1171         .name =         "snd-usb-audio",
1172         .probe =        usb_audio_probe,
1173         .disconnect =   usb_audio_disconnect,
1174         .suspend =      usb_audio_suspend,
1175         .resume =       usb_audio_resume,
1176         .reset_resume = usb_audio_resume,
1177         .id_table =     usb_audio_ids,
1178         .supports_autosuspend = 1,
1179 };
1180
1181 module_usb_driver(usb_audio_driver);