sound/usb/card.c

   1 /*
   2  *   (Tentative) USB Audio Driver for ALSA
   3  *
   4  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   5  *
   6  *   Many codes borrowed from audio.c by
   7  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
   8  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
   9  *
  10  *
  11  *   This program is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU General Public License as published by
  13  *   the Free Software Foundation; either version 2 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This program is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with this program; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  24  *
  25  *
  26  *  NOTES:
  27  *
  28  *   - the linked URBs would be preferred but not used so far because of
  29  *     the instability of unlinking.
  30  *   - type II is not supported properly.  there is no device which supports
  31  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  32  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  33  */
  34
  35
  36 #include <linux/bitops.h>
  37 #include <linux/init.h>
  38 #include <linux/list.h>
  39 #include <linux/slab.h>
  40 #include <linux/string.h>
  41 #include <linux/ctype.h>
  42 #include <linux/usb.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/mutex.h>
  45 #include <linux/usb/audio.h>
  46 #include <linux/usb/audio-v2.h>
  47 #include <linux/module.h>
  48
  49 #include <sound/control.h>
  50 #include <sound/core.h>
  51 #include <sound/info.h>
  52 #include <sound/pcm.h>
  53 #include <sound/pcm_params.h>
  54 #include <sound/initval.h>
  55
  56 #include "usbaudio.h"
  57 #include "card.h"
  58 #include "midi.h"
  59 #include "mixer.h"
  60 #include "proc.h"
  61 #include "quirks.h"
  62 #include "endpoint.h"
  63 #include "helper.h"
  64 #include "debug.h"
  65 #include "pcm.h"
  66 #include "format.h"
  67 #include "power.h"
  68 #include "stream.h"
  69
  70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  71 MODULE_DESCRIPTION("USB Audio");
  72 MODULE_LICENSE("GPL");
  73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  74
  75
  76 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  77 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  78 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  79 /* Vendor/product IDs for this card */
  80 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  81 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  82 static int nrpacks = 8;         /* max. number of packets per urb */
  83 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  84 static bool ignore_ctl_error;
  85 static bool autoclock = true;
  86
  87 module_param_array(index, int, NULL, 0444);
  88 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  89 module_param_array(id, charp, NULL, 0444);
  90 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  91 module_param_array(enable, bool, NULL, 0444);
  92 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  93 module_param_array(vid, int, NULL, 0444);
  94 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  95 module_param_array(pid, int, NULL, 0444);
  96 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
  97 module_param(nrpacks, int, 0644);
  98 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
  99 module_param_array(device_setup, int, NULL, 0444);
 100 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 101 module_param(ignore_ctl_error, bool, 0444);
 102 MODULE_PARM_DESC(ignore_ctl_error,
 103                  "Ignore errors from USB controller for mixer interfaces.");
 104 module_param(autoclock, bool, 0444);
 105 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
 106
 107 /*
 108  * we keep the snd_usb_audio_t instances by ourselves for merging
 109  * the all interfaces on the same card as one sound device.
 110  */
 111
 112 static DEFINE_MUTEX(register_mutex);
 113 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 114 static struct usb_driver usb_audio_driver;
 115
 116 /*
 117  * disconnect streams
 118  * called from snd_usb_audio_disconnect()
 119  */
 120 static void snd_usb_stream_disconnect(struct list_head *head)
 121 {
 122         int idx;
 123         struct snd_usb_stream *as;
 124         struct snd_usb_substream *subs;
 125
 126         as = list_entry(head, struct snd_usb_stream, list);
 127         for (idx = 0; idx < 2; idx++) {
 128                 subs = &as->substream[idx];
 129                 if (!subs->num_formats)
 130                         continue;
 131                 subs->interface = -1;
 132                 subs->data_endpoint = NULL;
 133                 subs->sync_endpoint = NULL;
 134         }
 135 }
 136
 137 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 138 {
 139         struct usb_device *dev = chip->dev;
 140         struct usb_host_interface *alts;
 141         struct usb_interface_descriptor *altsd;
 142         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 143
 144         if (!iface) {
 145                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
 146                            dev->devnum, ctrlif, interface);
 147                 return -EINVAL;
 148         }
 149
 150         if (usb_interface_claimed(iface)) {
 151                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
 152                                                 dev->devnum, ctrlif, interface);
 153                 return -EINVAL;
 154         }
 155
 156         alts = &iface->altsetting[0];
 157         altsd = get_iface_desc(alts);
 158         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 159              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 160             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 161                 int err = snd_usbmidi_create(chip->card, iface,
 162                                              &chip->midi_list, NULL);
 163                 if (err < 0) {
 164                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
 165                                                 dev->devnum, ctrlif, interface);
 166                         return -EINVAL;
 167                 }
 168                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 169
 170                 return 0;
 171         }
 172
 173         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 174              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 175             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 176                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
 177                                         dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
 178                 /* skip non-supported classes */
 179                 return -EINVAL;
 180         }
 181
 182         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 183                 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
 184                 return -EINVAL;
 185         }
 186
 187         if (! snd_usb_parse_audio_interface(chip, interface)) {
 188                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 189                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 190                 return -EINVAL;
 191         }
 192
 193         return 0;
 194 }
 195
 196 /*
 197  * parse audio control descriptor and create pcm/midi streams
 198  */
 199 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 200 {
 201         struct usb_device *dev = chip->dev;
 202         struct usb_host_interface *host_iface;
 203         struct usb_interface_descriptor *altsd;
 204         void *control_header;
 205         int i, protocol;
 206
 207         /* find audiocontrol interface */
 208         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 209         control_header = snd_usb_find_csint_desc(host_iface->extra,
 210                                                  host_iface->extralen,
 211                                                  NULL, UAC_HEADER);
 212         altsd = get_iface_desc(host_iface);
 213         protocol = altsd->bInterfaceProtocol;
 214
 215         if (!control_header) {
 216                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
 217                 return -EINVAL;
 218         }
 219
 220         switch (protocol) {
 221         default:
 222                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
 223                             protocol);
 224                 /* fall through */
 225
 226         case UAC_VERSION_1: {
 227                 struct uac1_ac_header_descriptor *h1 = control_header;
 228
 229                 if (!h1->bInCollection) {
 230                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
 231                         return -EINVAL;
 232                 }
 233
 234                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 235                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
 236                         return -EINVAL;
 237                 }
 238
 239                 for (i = 0; i < h1->bInCollection; i++)
 240                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 241
 242                 break;
 243         }
 244
 245         case UAC_VERSION_2: {
 246                 struct usb_interface_assoc_descriptor *assoc =
 247                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 248
 249                 if (!assoc) {
 250                         /*
 251                          * Firmware writers cannot count to three.  So to find
 252                          * the IAD on the NuForce UDH-100, also check the next
 253                          * interface.
 254                          */
 255                         struct usb_interface *iface =
 256                                 usb_ifnum_to_if(dev, ctrlif + 1);
 257                         if (iface &&
 258                             iface->intf_assoc &&
 259                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 260                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 261                                 assoc = iface->intf_assoc;
 262                 }
 263
 264                 if (!assoc) {
 265                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
 266                         return -EINVAL;
 267                 }
 268
 269                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 270                         int intf = assoc->bFirstInterface + i;
 271
 272                         if (intf != ctrlif)
 273                                 snd_usb_create_stream(chip, ctrlif, intf);
 274                 }
 275
 276                 break;
 277         }
 278         }
 279
 280         return 0;
 281 }
 282
 283 /*
 284  * free the chip instance
 285  *
 286  * here we have to do not much, since pcm and controls are already freed
 287  *
 288  */
 289
 290 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 291 {
 292         mutex_destroy(&chip->mutex);
 293         kfree(chip);
 294         return 0;
 295 }
 296
 297 static int snd_usb_audio_dev_free(struct snd_device *device)
 298 {
 299         struct snd_usb_audio *chip = device->device_data;
 300         return snd_usb_audio_free(chip);
 301 }
 302
 303 static void remove_trailing_spaces(char *str)
 304 {
 305         char *p;
 306
 307         if (!*str)
 308                 return;
 309         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 310                 *p = 0;
 311 }
 312
 313 /*
 314  * create a chip instance and set its names.
 315  */
 316 static int snd_usb_audio_create(struct usb_device *dev, int idx,
 317                                 const struct snd_usb_audio_quirk *quirk,
 318                                 struct snd_usb_audio **rchip)
 319 {
 320         struct snd_card *card;
 321         struct snd_usb_audio *chip;
 322         int err, len;
 323         char component[14];
 324         static struct snd_device_ops ops = {
 325                 .dev_free =     snd_usb_audio_dev_free,
 326         };
 327
 328         *rchip = NULL;
 329
 330         switch (snd_usb_get_speed(dev)) {
 331         case USB_SPEED_LOW:
 332         case USB_SPEED_FULL:
 333         case USB_SPEED_HIGH:
 334         case USB_SPEED_SUPER:
 335                 break;
 336         default:
 337                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
 338                 return -ENXIO;
 339         }
 340
 341         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
 342         if (err < 0) {
 343                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
 344                 return err;
 345         }
 346
 347         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 348         if (! chip) {
 349                 snd_card_free(card);
 350                 return -ENOMEM;
 351         }
 352
 353         mutex_init(&chip->mutex);
 354         init_rwsem(&chip->shutdown_rwsem);
 355         chip->index = idx;
 356         chip->dev = dev;
 357         chip->card = card;
 358         chip->setup = device_setup[idx];
 359         chip->nrpacks = nrpacks;
 360         chip->autoclock = autoclock;
 361         chip->probing = 1;
 362
 363         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 364                               le16_to_cpu(dev->descriptor.idProduct));
 365         INIT_LIST_HEAD(&chip->pcm_list);
 366         INIT_LIST_HEAD(&chip->ep_list);
 367         INIT_LIST_HEAD(&chip->midi_list);
 368         INIT_LIST_HEAD(&chip->mixer_list);
 369
 370         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 371                 snd_usb_audio_free(chip);
 372                 snd_card_free(card);
 373                 return err;
 374         }
 375
 376         strcpy(card->driver, "USB-Audio");
 377         sprintf(component, "USB%04x:%04x",
 378                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 379         snd_component_add(card, component);
 380
 381         /* retrieve the device string as shortname */
 382         if (quirk && quirk->product_name && *quirk->product_name) {
 383                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 384         } else {
 385                 if (!dev->descriptor.iProduct ||
 386                     usb_string(dev, dev->descriptor.iProduct,
 387                     card->shortname, sizeof(card->shortname)) <= 0) {
 388                         /* no name available from anywhere, so use ID */
 389                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 390                                 USB_ID_VENDOR(chip->usb_id),
 391                                 USB_ID_PRODUCT(chip->usb_id));
 392                 }
 393         }
 394         remove_trailing_spaces(card->shortname);
 395
 396         /* retrieve the vendor and device strings as longname */
 397         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 398                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 399         } else {
 400                 if (dev->descriptor.iManufacturer)
 401                         len = usb_string(dev, dev->descriptor.iManufacturer,
 402                                          card->longname, sizeof(card->longname));
 403                 else
 404                         len = 0;
 405                 /* we don't really care if there isn't any vendor string */
 406         }
 407         if (len > 0) {
 408                 remove_trailing_spaces(card->longname);
 409                 if (*card->longname)
 410                         strlcat(card->longname, " ", sizeof(card->longname));
 411         }
 412
 413         strlcat(card->longname, card->shortname, sizeof(card->longname));
 414
 415         len = strlcat(card->longname, " at ", sizeof(card->longname));
 416
 417         if (len < sizeof(card->longname))
 418                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 419
 420         switch (snd_usb_get_speed(dev)) {
 421         case USB_SPEED_LOW:
 422                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 423                 break;
 424         case USB_SPEED_FULL:
 425                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 426                 break;
 427         case USB_SPEED_HIGH:
 428                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 429                 break;
 430         case USB_SPEED_SUPER:
 431                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 432                 break;
 433         default:
 434                 break;
 435         }
 436
 437         snd_usb_audio_create_proc(chip);
 438
 439         *rchip = chip;
 440         return 0;
 441 }
 442
 443 /*
 444  * probe the active usb device
 445  *
 446  * note that this can be called multiple times per a device, when it
 447  * includes multiple audio control interfaces.
 448  *
 449  * thus we check the usb device pointer and creates the card instance
 450  * only at the first time.  the successive calls of this function will
 451  * append the pcm interface to the corresponding card.
 452  */
 453 static struct snd_usb_audio *
 454 snd_usb_audio_probe(struct usb_device *dev,
 455                     struct usb_interface *intf,
 456                     const struct usb_device_id *usb_id)
 457 {
 458         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 459         int i, err;
 460         struct snd_usb_audio *chip;
 461         struct usb_host_interface *alts;
 462         int ifnum;
 463         u32 id;
 464
 465         alts = &intf->altsetting[0];
 466         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 467         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 468                     le16_to_cpu(dev->descriptor.idProduct));
 469         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 470                 goto __err_val;
 471
 472         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
 473                 goto __err_val;
 474
 475         /*
 476          * found a config.  now register to ALSA
 477          */
 478
 479         /* check whether it's already registered */
 480         chip = NULL;
 481         mutex_lock(&register_mutex);
 482         for (i = 0; i < SNDRV_CARDS; i++) {
 483                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 484                         if (usb_chip[i]->shutdown) {
 485                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
 486                                 goto __error;
 487                         }
 488                         chip = usb_chip[i];
 489                         chip->probing = 1;
 490                         break;
 491                 }
 492         }
 493         if (! chip) {
 494                 /* it's a fresh one.
 495                  * now look for an empty slot and create a new card instance
 496                  */
 497                 for (i = 0; i < SNDRV_CARDS; i++)
 498                         if (enable[i] && ! usb_chip[i] &&
 499                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 500                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 501                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
 502                                         goto __error;
 503                                 }
 504                                 snd_card_set_dev(chip->card, &intf->dev);
 505                                 chip->pm_intf = intf;
 506                                 break;
 507                         }
 508                 if (!chip) {
 509                         printk(KERN_ERR "no available usb audio device\n");
 510                         goto __error;
 511                 }
 512         }
 513
 514         /*
 515          * For devices with more than one control interface, we assume the
 516          * first contains the audio controls. We might need a more specific
 517          * check here in the future.
 518          */
 519         if (!chip->ctrl_intf)
 520                 chip->ctrl_intf = alts;
 521
 522         chip->txfr_quirk = 0;
 523         err = 1; /* continue */
 524         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 525                 /* need some special handlings */
 526                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
 527                         goto __error;
 528         }
 529
 530         if (err > 0) {
 531                 /* create normal USB audio interfaces */
 532                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
 533                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
 534                         goto __error;
 535                 }
 536         }
 537
 538         /* we are allowed to call snd_card_register() many times */
 539         if (snd_card_register(chip->card) < 0) {
 540                 goto __error;
 541         }
 542
 543         usb_chip[chip->index] = chip;
 544         chip->num_interfaces++;
 545         chip->probing = 0;
 546         mutex_unlock(&register_mutex);
 547         return chip;
 548
 549  __error:
 550         if (chip) {
 551                 if (!chip->num_interfaces)
 552                         snd_card_free(chip->card);
 553                 chip->probing = 0;
 554         }
 555         mutex_unlock(&register_mutex);
 556  __err_val:
 557         return NULL;
 558 }
 559
 560 /*
 561  * we need to take care of counter, since disconnection can be called also
 562  * many times as well as usb_audio_probe().
 563  */
 564 static void snd_usb_audio_disconnect(struct usb_device *dev,
 565                                      struct snd_usb_audio *chip)
 566 {
 567         struct snd_card *card;
 568         struct list_head *p, *n;
 569
 570         if (chip == (void *)-1L)
 571                 return;
 572
 573         card = chip->card;
 574         down_write(&chip->shutdown_rwsem);
 575         chip->shutdown = 1;
 576         up_write(&chip->shutdown_rwsem);
 577
 578         mutex_lock(&register_mutex);
 579         chip->num_interfaces--;
 580         if (chip->num_interfaces <= 0) {
 581                 snd_card_disconnect(card);
 582                 /* release the pcm resources */
 583                 list_for_each(p, &chip->pcm_list) {
 584                         snd_usb_stream_disconnect(p);
 585                 }
 586                 /* release the endpoint resources */
 587                 list_for_each_safe(p, n, &chip->ep_list) {
 588                         snd_usb_endpoint_free(p);
 589                 }
 590                 /* release the midi resources */
 591                 list_for_each(p, &chip->midi_list) {
 592                         snd_usbmidi_disconnect(p);
 593                 }
 594                 /* release mixer resources */
 595                 list_for_each(p, &chip->mixer_list) {
 596                         snd_usb_mixer_disconnect(p);
 597                 }
 598                 usb_chip[chip->index] = NULL;
 599                 mutex_unlock(&register_mutex);
 600                 snd_card_free_when_closed(card);
 601         } else {
 602                 mutex_unlock(&register_mutex);
 603         }
 604 }
 605
 606 /*
 607  * new 2.5 USB kernel API
 608  */
 609 static int usb_audio_probe(struct usb_interface *intf,
 610                            const struct usb_device_id *id)
 611 {
 612         struct snd_usb_audio *chip;
 613         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
 614         if (chip) {
 615                 usb_set_intfdata(intf, chip);
 616                 return 0;
 617         } else
 618                 return -EIO;
 619 }
 620
 621 static void usb_audio_disconnect(struct usb_interface *intf)
 622 {
 623         snd_usb_audio_disconnect(interface_to_usbdev(intf),
 624                                  usb_get_intfdata(intf));
 625 }
 626
 627 #ifdef CONFIG_PM
 628
 629 int snd_usb_autoresume(struct snd_usb_audio *chip)
 630 {
 631         int err = -ENODEV;
 632
 633         down_read(&chip->shutdown_rwsem);
 634         if (chip->probing)
 635                 err = 0;
 636         else if (!chip->shutdown)
 637                 err = usb_autopm_get_interface(chip->pm_intf);
 638         up_read(&chip->shutdown_rwsem);
 639
 640         return err;
 641 }
 642
 643 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 644 {
 645         down_read(&chip->shutdown_rwsem);
 646         if (!chip->shutdown && !chip->probing)
 647                 usb_autopm_put_interface(chip->pm_intf);
 648         up_read(&chip->shutdown_rwsem);
 649 }
 650
 651 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 652 {
 653         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 654         struct snd_usb_stream *as;
 655         struct usb_mixer_interface *mixer;
 656
 657         if (chip == (void *)-1L)
 658                 return 0;
 659
 660         if (!PMSG_IS_AUTO(message)) {
 661                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 662                 if (!chip->num_suspended_intf++) {
 663                         list_for_each_entry(as, &chip->pcm_list, list) {
 664                                 snd_pcm_suspend_all(as->pcm);
 665                                 as->substream[0].need_setup_ep =
 666                                         as->substream[1].need_setup_ep = true;
 667                         }
 668                 }
 669         } else {
 670                 /*
 671                  * otherwise we keep the rest of the system in the dark
 672                  * to keep this transparent
 673                  */
 674                 if (!chip->num_suspended_intf++)
 675                         chip->autosuspended = 1;
 676         }
 677
 678         list_for_each_entry(mixer, &chip->mixer_list, list)
 679                 snd_usb_mixer_inactivate(mixer);
 680
 681         return 0;
 682 }
 683
 684 static int usb_audio_resume(struct usb_interface *intf)
 685 {
 686         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 687         struct usb_mixer_interface *mixer;
 688         int err = 0;
 689
 690         if (chip == (void *)-1L)
 691                 return 0;
 692         if (--chip->num_suspended_intf)
 693                 return 0;
 694         /*
 695          * ALSA leaves material resumption to user space
 696          * we just notify and restart the mixers
 697          */
 698         list_for_each_entry(mixer, &chip->mixer_list, list) {
 699                 err = snd_usb_mixer_activate(mixer);
 700                 if (err < 0)
 701                         goto err_out;
 702         }
 703
 704         if (!chip->autosuspended)
 705                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 706         chip->autosuspended = 0;
 707
 708 err_out:
 709         return err;
 710 }
 711 #else
 712 #define usb_audio_suspend       NULL
 713 #define usb_audio_resume        NULL
 714 #endif          /* CONFIG_PM */
 715
 716 static struct usb_device_id usb_audio_ids [] = {
 717 #include "quirks-table.h"
 718     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 719       .bInterfaceClass = USB_CLASS_AUDIO,
 720       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 721     { }                                         /* Terminating entry */
 722 };
 723 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 724
 725 /*
 726  * entry point for linux usb interface
 727  */
 728
 729 static struct usb_driver usb_audio_driver = {
 730         .name =         "snd-usb-audio",
 731         .probe =        usb_audio_probe,
 732         .disconnect =   usb_audio_disconnect,
 733         .suspend =      usb_audio_suspend,
 734         .resume =       usb_audio_resume,
 735         .id_table =     usb_audio_ids,
 736         .supports_autosuspend = 1,
 737 };
 738
 739 static int __init snd_usb_audio_init(void)
 740 {
 741         if (nrpacks < 1 || nrpacks > MAX_PACKS) {
 742                 printk(KERN_WARNING "invalid nrpacks value.\n");
 743                 return -EINVAL;
 744         }
 745         return usb_register(&usb_audio_driver);
 746 }
 747
 748 static void __exit snd_usb_audio_cleanup(void)
 749 {
 750         usb_deregister(&usb_audio_driver);
 751 }
 752
 753 module_init(snd_usb_audio_init);
 754 module_exit(snd_usb_audio_cleanup);