sound/usb/card.c

   1 /*
   2  *   (Tentative) USB Audio Driver for ALSA
   3  *
   4  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   5  *
   6  *   Many codes borrowed from audio.c by
   7  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
   8  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
   9  *
  10  *
  11  *   This program is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU General Public License as published by
  13  *   the Free Software Foundation; either version 2 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This program is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with this program; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  24  *
  25  *
  26  *  NOTES:
  27  *
  28  *   - the linked URBs would be preferred but not used so far because of
  29  *     the instability of unlinking.
  30  *   - type II is not supported properly.  there is no device which supports
  31  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  32  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  33  */
  34
  35
  36 #include <linux/bitops.h>
  37 #include <linux/init.h>
  38 #include <linux/list.h>
  39 #include <linux/slab.h>
  40 #include <linux/string.h>
  41 #include <linux/ctype.h>
  42 #include <linux/usb.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/mutex.h>
  45 #include <linux/usb/audio.h>
  46 #include <linux/usb/audio-v2.h>
  47 #include <linux/module.h>
  48
  49 #include <sound/control.h>
  50 #include <sound/core.h>
  51 #include <sound/info.h>
  52 #include <sound/pcm.h>
  53 #include <sound/pcm_params.h>
  54 #include <sound/initval.h>
  55
  56 #include "usbaudio.h"
  57 #include "card.h"
  58 #include "midi.h"
  59 #include "mixer.h"
  60 #include "proc.h"
  61 #include "quirks.h"
  62 #include "endpoint.h"
  63 #include "helper.h"
  64 #include "debug.h"
  65 #include "pcm.h"
  66 #include "format.h"
  67 #include "power.h"
  68 #include "stream.h"
  69
  70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  71 MODULE_DESCRIPTION("USB Audio");
  72 MODULE_LICENSE("GPL");
  73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  74
  75
  76 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  77 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  78 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  79 /* Vendor/product IDs for this card */
  80 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  81 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  82 static int nrpacks = 8;         /* max. number of packets per urb */
  83 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  84 static bool ignore_ctl_error;
  85
  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(nrpacks, int, 0644);
  97 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
  98 module_param_array(device_setup, int, NULL, 0444);
  99 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 100 module_param(ignore_ctl_error, bool, 0444);
 101 MODULE_PARM_DESC(ignore_ctl_error,
 102                  "Ignore errors from USB controller for mixer interfaces.");
 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 snd_usb_audio_disconnect()
 116  */
 117 static void snd_usb_stream_disconnect(struct list_head *head)
 118 {
 119         int idx;
 120         struct snd_usb_stream *as;
 121         struct snd_usb_substream *subs;
 122
 123         as = list_entry(head, struct snd_usb_stream, list);
 124         for (idx = 0; idx < 2; idx++) {
 125                 subs = &as->substream[idx];
 126                 if (!subs->num_formats)
 127                         continue;
 128                 subs->interface = -1;
 129                 subs->data_endpoint = NULL;
 130                 subs->sync_endpoint = NULL;
 131         }
 132 }
 133
 134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 135 {
 136         struct usb_device *dev = chip->dev;
 137         struct usb_host_interface *alts;
 138         struct usb_interface_descriptor *altsd;
 139         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 140
 141         if (!iface) {
 142                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
 143                            dev->devnum, ctrlif, interface);
 144                 return -EINVAL;
 145         }
 146
 147         if (usb_interface_claimed(iface)) {
 148                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
 149                                                 dev->devnum, ctrlif, interface);
 150                 return -EINVAL;
 151         }
 152
 153         alts = &iface->altsetting[0];
 154         altsd = get_iface_desc(alts);
 155         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 156              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 157             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 158                 int err = snd_usbmidi_create(chip->card, iface,
 159                                              &chip->midi_list, NULL);
 160                 if (err < 0) {
 161                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
 162                                                 dev->devnum, ctrlif, interface);
 163                         return -EINVAL;
 164                 }
 165                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 166
 167                 return 0;
 168         }
 169
 170         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 171              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 172             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 173                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
 174                                         dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
 175                 /* skip non-supported classes */
 176                 return -EINVAL;
 177         }
 178
 179         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 180                 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
 181                 return -EINVAL;
 182         }
 183
 184         if (! snd_usb_parse_audio_interface(chip, interface)) {
 185                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 186                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 187                 return -EINVAL;
 188         }
 189
 190         return 0;
 191 }
 192
 193 /*
 194  * parse audio control descriptor and create pcm/midi streams
 195  */
 196 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 197 {
 198         struct usb_device *dev = chip->dev;
 199         struct usb_host_interface *host_iface;
 200         struct usb_interface_descriptor *altsd;
 201         void *control_header;
 202         int i, protocol;
 203
 204         /* find audiocontrol interface */
 205         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 206         control_header = snd_usb_find_csint_desc(host_iface->extra,
 207                                                  host_iface->extralen,
 208                                                  NULL, UAC_HEADER);
 209         altsd = get_iface_desc(host_iface);
 210         protocol = altsd->bInterfaceProtocol;
 211
 212         if (!control_header) {
 213                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
 214                 return -EINVAL;
 215         }
 216
 217         switch (protocol) {
 218         default:
 219                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
 220                             protocol);
 221                 /* fall through */
 222
 223         case UAC_VERSION_1: {
 224                 struct uac1_ac_header_descriptor *h1 = control_header;
 225
 226                 if (!h1->bInCollection) {
 227                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
 228                         return -EINVAL;
 229                 }
 230
 231                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 232                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
 233                         return -EINVAL;
 234                 }
 235
 236                 for (i = 0; i < h1->bInCollection; i++)
 237                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 238
 239                 break;
 240         }
 241
 242         case UAC_VERSION_2: {
 243                 struct usb_interface_assoc_descriptor *assoc =
 244                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 245
 246                 if (!assoc) {
 247                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
 248                         return -EINVAL;
 249                 }
 250
 251                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 252                         int intf = assoc->bFirstInterface + i;
 253
 254                         if (intf != ctrlif)
 255                                 snd_usb_create_stream(chip, ctrlif, intf);
 256                 }
 257
 258                 break;
 259         }
 260         }
 261
 262         return 0;
 263 }
 264
 265 /*
 266  * free the chip instance
 267  *
 268  * here we have to do not much, since pcm and controls are already freed
 269  *
 270  */
 271
 272 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 273 {
 274         mutex_destroy(&chip->mutex);
 275         kfree(chip);
 276         return 0;
 277 }
 278
 279 static int snd_usb_audio_dev_free(struct snd_device *device)
 280 {
 281         struct snd_usb_audio *chip = device->device_data;
 282         return snd_usb_audio_free(chip);
 283 }
 284
 285 static void remove_trailing_spaces(char *str)
 286 {
 287         char *p;
 288
 289         if (!*str)
 290                 return;
 291         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 292                 *p = 0;
 293 }
 294
 295 /*
 296  * create a chip instance and set its names.
 297  */
 298 static int snd_usb_audio_create(struct usb_device *dev, int idx,
 299                                 const struct snd_usb_audio_quirk *quirk,
 300                                 struct snd_usb_audio **rchip)
 301 {
 302         struct snd_card *card;
 303         struct snd_usb_audio *chip;
 304         int err, len;
 305         char component[14];
 306         static struct snd_device_ops ops = {
 307                 .dev_free =     snd_usb_audio_dev_free,
 308         };
 309
 310         *rchip = NULL;
 311
 312         switch (snd_usb_get_speed(dev)) {
 313         case USB_SPEED_LOW:
 314         case USB_SPEED_FULL:
 315         case USB_SPEED_HIGH:
 316         case USB_SPEED_SUPER:
 317                 break;
 318         default:
 319                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
 320                 return -ENXIO;
 321         }
 322
 323         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
 324         if (err < 0) {
 325                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
 326                 return err;
 327         }
 328
 329         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 330         if (! chip) {
 331                 snd_card_free(card);
 332                 return -ENOMEM;
 333         }
 334
 335         mutex_init(&chip->mutex);
 336         init_rwsem(&chip->shutdown_rwsem);
 337         chip->index = idx;
 338         chip->dev = dev;
 339         chip->card = card;
 340         chip->setup = device_setup[idx];
 341         chip->nrpacks = nrpacks;
 342         chip->probing = 1;
 343
 344         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 345                               le16_to_cpu(dev->descriptor.idProduct));
 346         INIT_LIST_HEAD(&chip->pcm_list);
 347         INIT_LIST_HEAD(&chip->ep_list);
 348         INIT_LIST_HEAD(&chip->midi_list);
 349         INIT_LIST_HEAD(&chip->mixer_list);
 350
 351         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 352                 snd_usb_audio_free(chip);
 353                 snd_card_free(card);
 354                 return err;
 355         }
 356
 357         strcpy(card->driver, "USB-Audio");
 358         sprintf(component, "USB%04x:%04x",
 359                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 360         snd_component_add(card, component);
 361
 362         /* retrieve the device string as shortname */
 363         if (quirk && quirk->product_name && *quirk->product_name) {
 364                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 365         } else {
 366                 if (!dev->descriptor.iProduct ||
 367                     usb_string(dev, dev->descriptor.iProduct,
 368                     card->shortname, sizeof(card->shortname)) <= 0) {
 369                         /* no name available from anywhere, so use ID */
 370                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 371                                 USB_ID_VENDOR(chip->usb_id),
 372                                 USB_ID_PRODUCT(chip->usb_id));
 373                 }
 374         }
 375         remove_trailing_spaces(card->shortname);
 376
 377         /* retrieve the vendor and device strings as longname */
 378         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 379                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 380         } else {
 381                 if (dev->descriptor.iManufacturer)
 382                         len = usb_string(dev, dev->descriptor.iManufacturer,
 383                                          card->longname, sizeof(card->longname));
 384                 else
 385                         len = 0;
 386                 /* we don't really care if there isn't any vendor string */
 387         }
 388         if (len > 0) {
 389                 remove_trailing_spaces(card->longname);
 390                 if (*card->longname)
 391                         strlcat(card->longname, " ", sizeof(card->longname));
 392         }
 393
 394         strlcat(card->longname, card->shortname, sizeof(card->longname));
 395
 396         len = strlcat(card->longname, " at ", sizeof(card->longname));
 397
 398         if (len < sizeof(card->longname))
 399                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 400
 401         switch (snd_usb_get_speed(dev)) {
 402         case USB_SPEED_LOW:
 403                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 404                 break;
 405         case USB_SPEED_FULL:
 406                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 407                 break;
 408         case USB_SPEED_HIGH:
 409                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 410                 break;
 411         case USB_SPEED_SUPER:
 412                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 413                 break;
 414         default:
 415                 break;
 416         }
 417
 418         snd_usb_audio_create_proc(chip);
 419
 420         *rchip = chip;
 421         return 0;
 422 }
 423
 424 /*
 425  * probe the active usb device
 426  *
 427  * note that this can be called multiple times per a device, when it
 428  * includes multiple audio control interfaces.
 429  *
 430  * thus we check the usb device pointer and creates the card instance
 431  * only at the first time.  the successive calls of this function will
 432  * append the pcm interface to the corresponding card.
 433  */
 434 static struct snd_usb_audio *
 435 snd_usb_audio_probe(struct usb_device *dev,
 436                     struct usb_interface *intf,
 437                     const struct usb_device_id *usb_id)
 438 {
 439         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 440         int i, err;
 441         struct snd_usb_audio *chip;
 442         struct usb_host_interface *alts;
 443         int ifnum;
 444         u32 id;
 445
 446         alts = &intf->altsetting[0];
 447         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 448         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 449                     le16_to_cpu(dev->descriptor.idProduct));
 450         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 451                 goto __err_val;
 452
 453         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
 454                 goto __err_val;
 455
 456         /*
 457          * found a config.  now register to ALSA
 458          */
 459
 460         /* check whether it's already registered */
 461         chip = NULL;
 462         mutex_lock(&register_mutex);
 463         for (i = 0; i < SNDRV_CARDS; i++) {
 464                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 465                         if (usb_chip[i]->shutdown) {
 466                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
 467                                 goto __error;
 468                         }
 469                         chip = usb_chip[i];
 470                         chip->probing = 1;
 471                         break;
 472                 }
 473         }
 474         if (! chip) {
 475                 /* it's a fresh one.
 476                  * now look for an empty slot and create a new card instance
 477                  */
 478                 for (i = 0; i < SNDRV_CARDS; i++)
 479                         if (enable[i] && ! usb_chip[i] &&
 480                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 481                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 482                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
 483                                         goto __error;
 484                                 }
 485                                 snd_card_set_dev(chip->card, &intf->dev);
 486                                 chip->pm_intf = intf;
 487                                 break;
 488                         }
 489                 if (!chip) {
 490                         printk(KERN_ERR "no available usb audio device\n");
 491                         goto __error;
 492                 }
 493         }
 494
 495         /*
 496          * For devices with more than one control interface, we assume the
 497          * first contains the audio controls. We might need a more specific
 498          * check here in the future.
 499          */
 500         if (!chip->ctrl_intf)
 501                 chip->ctrl_intf = alts;
 502
 503         chip->txfr_quirk = 0;
 504         err = 1; /* continue */
 505         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 506                 /* need some special handlings */
 507                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
 508                         goto __error;
 509         }
 510
 511         if (err > 0) {
 512                 /* create normal USB audio interfaces */
 513                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
 514                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
 515                         goto __error;
 516                 }
 517         }
 518
 519         /* we are allowed to call snd_card_register() many times */
 520         if (snd_card_register(chip->card) < 0) {
 521                 goto __error;
 522         }
 523
 524         usb_chip[chip->index] = chip;
 525         chip->num_interfaces++;
 526         chip->probing = 0;
 527         mutex_unlock(&register_mutex);
 528         return chip;
 529
 530  __error:
 531         if (chip) {
 532                 if (!chip->num_interfaces)
 533                         snd_card_free(chip->card);
 534                 chip->probing = 0;
 535         }
 536         mutex_unlock(&register_mutex);
 537  __err_val:
 538         return NULL;
 539 }
 540
 541 /*
 542  * we need to take care of counter, since disconnection can be called also
 543  * many times as well as usb_audio_probe().
 544  */
 545 static void snd_usb_audio_disconnect(struct usb_device *dev,
 546                                      struct snd_usb_audio *chip)
 547 {
 548         struct snd_card *card;
 549         struct list_head *p, *n;
 550
 551         if (chip == (void *)-1L)
 552                 return;
 553
 554         card = chip->card;
 555         down_write(&chip->shutdown_rwsem);
 556         chip->shutdown = 1;
 557         up_write(&chip->shutdown_rwsem);
 558
 559         mutex_lock(&register_mutex);
 560         chip->num_interfaces--;
 561         if (chip->num_interfaces <= 0) {
 562                 snd_card_disconnect(card);
 563                 /* release the pcm resources */
 564                 list_for_each(p, &chip->pcm_list) {
 565                         snd_usb_stream_disconnect(p);
 566                 }
 567                 /* release the endpoint resources */
 568                 list_for_each_safe(p, n, &chip->ep_list) {
 569                         snd_usb_endpoint_free(p);
 570                 }
 571                 /* release the midi resources */
 572                 list_for_each(p, &chip->midi_list) {
 573                         snd_usbmidi_disconnect(p);
 574                 }
 575                 /* release mixer resources */
 576                 list_for_each(p, &chip->mixer_list) {
 577                         snd_usb_mixer_disconnect(p);
 578                 }
 579                 usb_chip[chip->index] = NULL;
 580                 mutex_unlock(&register_mutex);
 581                 snd_card_free_when_closed(card);
 582         } else {
 583                 mutex_unlock(&register_mutex);
 584         }
 585 }
 586
 587 /*
 588  * new 2.5 USB kernel API
 589  */
 590 static int usb_audio_probe(struct usb_interface *intf,
 591                            const struct usb_device_id *id)
 592 {
 593         struct snd_usb_audio *chip;
 594         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
 595         if (chip) {
 596                 usb_set_intfdata(intf, chip);
 597                 return 0;
 598         } else
 599                 return -EIO;
 600 }
 601
 602 static void usb_audio_disconnect(struct usb_interface *intf)
 603 {
 604         snd_usb_audio_disconnect(interface_to_usbdev(intf),
 605                                  usb_get_intfdata(intf));
 606 }
 607
 608 #ifdef CONFIG_PM
 609
 610 int snd_usb_autoresume(struct snd_usb_audio *chip)
 611 {
 612         int err = -ENODEV;
 613
 614         down_read(&chip->shutdown_rwsem);
 615         if (!chip->shutdown && !chip->probing)
 616                 err = usb_autopm_get_interface(chip->pm_intf);
 617         up_read(&chip->shutdown_rwsem);
 618
 619         return err;
 620 }
 621
 622 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 623 {
 624         down_read(&chip->shutdown_rwsem);
 625         if (!chip->shutdown && !chip->probing)
 626                 usb_autopm_put_interface(chip->pm_intf);
 627         up_read(&chip->shutdown_rwsem);
 628 }
 629
 630 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 631 {
 632         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 633         struct list_head *p;
 634         struct snd_usb_stream *as;
 635         struct usb_mixer_interface *mixer;
 636
 637         if (chip == (void *)-1L)
 638                 return 0;
 639
 640         if (!PMSG_IS_AUTO(message)) {
 641                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 642                 if (!chip->num_suspended_intf++) {
 643                         list_for_each(p, &chip->pcm_list) {
 644                                 as = list_entry(p, struct snd_usb_stream, list);
 645                                 snd_pcm_suspend_all(as->pcm);
 646                                 as->substream[0].need_setup_ep =
 647                                         as->substream[1].need_setup_ep = true;
 648                         }
 649                 }
 650         } else {
 651                 /*
 652                  * otherwise we keep the rest of the system in the dark
 653                  * to keep this transparent
 654                  */
 655                 if (!chip->num_suspended_intf++)
 656                         chip->autosuspended = 1;
 657         }
 658
 659         list_for_each_entry(mixer, &chip->mixer_list, list)
 660                 snd_usb_mixer_inactivate(mixer);
 661
 662         return 0;
 663 }
 664
 665 static int usb_audio_resume(struct usb_interface *intf)
 666 {
 667         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 668         struct usb_mixer_interface *mixer;
 669         int err = 0;
 670
 671         if (chip == (void *)-1L)
 672                 return 0;
 673         if (--chip->num_suspended_intf)
 674                 return 0;
 675         /*
 676          * ALSA leaves material resumption to user space
 677          * we just notify and restart the mixers
 678          */
 679         list_for_each_entry(mixer, &chip->mixer_list, list) {
 680                 err = snd_usb_mixer_activate(mixer);
 681                 if (err < 0)
 682                         goto err_out;
 683         }
 684
 685         if (!chip->autosuspended)
 686                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 687         chip->autosuspended = 0;
 688
 689 err_out:
 690         return err;
 691 }
 692 #else
 693 #define usb_audio_suspend       NULL
 694 #define usb_audio_resume        NULL
 695 #endif          /* CONFIG_PM */
 696
 697 static struct usb_device_id usb_audio_ids [] = {
 698 #include "quirks-table.h"
 699     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 700       .bInterfaceClass = USB_CLASS_AUDIO,
 701       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 702     { }                                         /* Terminating entry */
 703 };
 704
 705 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
 706
 707 /*
 708  * entry point for linux usb interface
 709  */
 710
 711 static struct usb_driver usb_audio_driver = {
 712         .name =         "snd-usb-audio",
 713         .probe =        usb_audio_probe,
 714         .disconnect =   usb_audio_disconnect,
 715         .suspend =      usb_audio_suspend,
 716         .resume =       usb_audio_resume,
 717         .id_table =     usb_audio_ids,
 718         .supports_autosuspend = 1,
 719 };
 720
 721 static int __init snd_usb_audio_init(void)
 722 {
 723         if (nrpacks < 1 || nrpacks > MAX_PACKS) {
 724                 printk(KERN_WARNING "invalid nrpacks value.\n");
 725                 return -EINVAL;
 726         }
 727         return usb_register(&usb_audio_driver);
 728 }
 729
 730 static void __exit snd_usb_audio_cleanup(void)
 731 {
 732         usb_deregister(&usb_audio_driver);
 733 }
 734
 735 module_init(snd_usb_audio_init);
 736 module_exit(snd_usb_audio_cleanup);