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  *   - async unlink should be used for avoiding the sleep inside lock.
  29  *     2.4.22 usb-uhci seems buggy for async unlinking and results in
  30  *     oops.  in such a cse, pass async_unlink=0 option.
  31  *   - the linked URBs would be preferred but not used so far because of
  32  *     the instability of unlinking.
  33  *   - type II is not supported properly.  there is no device which supports
  34  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  35  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  36  */
  37
  38
  39 #include <linux/bitops.h>
  40 #include <linux/init.h>
  41 #include <linux/list.h>
  42 #include <linux/slab.h>
  43 #include <linux/string.h>
  44 #include <linux/ctype.h>
  45 #include <linux/usb.h>
  46 #include <linux/moduleparam.h>
  47 #include <linux/mutex.h>
  48 #include <linux/usb/audio.h>
  49 #include <linux/usb/audio-v2.h>
  50 #include <linux/module.h>
  51
  52 #include <sound/control.h>
  53 #include <sound/core.h>
  54 #include <sound/info.h>
  55 #include <sound/pcm.h>
  56 #include <sound/pcm_params.h>
  57 #include <sound/initval.h>
  58
  59 #include "usbaudio.h"
  60 #include "card.h"
  61 #include "midi.h"
  62 #include "mixer.h"
  63 #include "proc.h"
  64 #include "quirks.h"
  65 #include "endpoint.h"
  66 #include "helper.h"
  67 #include "debug.h"
  68 #include "pcm.h"
  69 #include "format.h"
  70 #include "power.h"
  71 #include "stream.h"
  72
  73 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  74 MODULE_DESCRIPTION("USB Audio");
  75 MODULE_LICENSE("GPL");
  76 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  77
  78
  79 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  80 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  81 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  82 /* Vendor/product IDs for this card */
  83 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  84 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  85 static int nrpacks = 8;         /* max. number of packets per urb */
  86 static int async_unlink = 1;
  87 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  88 static int ignore_ctl_error;
  89
  90 module_param_array(index, int, NULL, 0444);
  91 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  92 module_param_array(id, charp, NULL, 0444);
  93 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  94 module_param_array(enable, bool, NULL, 0444);
  95 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  96 module_param_array(vid, int, NULL, 0444);
  97 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  98 module_param_array(pid, int, NULL, 0444);
  99 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
 100 module_param(nrpacks, int, 0644);
 101 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
 102 module_param(async_unlink, bool, 0444);
 103 MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
 104 module_param_array(device_setup, int, NULL, 0444);
 105 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 106 module_param(ignore_ctl_error, bool, 0444);
 107 MODULE_PARM_DESC(ignore_ctl_error,
 108                  "Ignore errors from USB controller for mixer interfaces.");
 109
 110 /*
 111  * we keep the snd_usb_audio_t instances by ourselves for merging
 112  * the all interfaces on the same card as one sound device.
 113  */
 114
 115 static DEFINE_MUTEX(register_mutex);
 116 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 117 static struct usb_driver usb_audio_driver;
 118
 119 /*
 120  * disconnect streams
 121  * called from snd_usb_audio_disconnect()
 122  */
 123 static void snd_usb_stream_disconnect(struct list_head *head)
 124 {
 125         int idx;
 126         struct snd_usb_stream *as;
 127         struct snd_usb_substream *subs;
 128
 129         as = list_entry(head, struct snd_usb_stream, list);
 130         for (idx = 0; idx < 2; idx++) {
 131                 subs = &as->substream[idx];
 132                 if (!subs->num_formats)
 133                         continue;
 134                 snd_usb_release_substream_urbs(subs, 1);
 135                 subs->interface = -1;
 136         }
 137 }
 138
 139 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 140 {
 141         struct usb_device *dev = chip->dev;
 142         struct usb_host_interface *alts;
 143         struct usb_interface_descriptor *altsd;
 144         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 145
 146         if (!iface) {
 147                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
 148                            dev->devnum, ctrlif, interface);
 149                 return -EINVAL;
 150         }
 151
 152         alts = &iface->altsetting[0];
 153         altsd = get_iface_desc(alts);
 154
 155         /*
 156          * Android with both accessory and audio interfaces enabled gets the
 157          * interface numbers wrong.
 158          */
 159         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 160              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 161             interface == 0 &&
 162             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 163             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 164                 interface = 2;
 165                 iface = usb_ifnum_to_if(dev, interface);
 166                 if (!iface)
 167                         return -EINVAL;
 168                 alts = &iface->altsetting[0];
 169                 altsd = get_iface_desc(alts);
 170         }
 171
 172         if (usb_interface_claimed(iface)) {
 173                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
 174                                                 dev->devnum, ctrlif, interface);
 175                 return -EINVAL;
 176         }
 177
 178         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 179              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 180             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 181                 int err = snd_usbmidi_create(chip->card, iface,
 182                                              &chip->midi_list, NULL);
 183                 if (err < 0) {
 184                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
 185                                                 dev->devnum, ctrlif, interface);
 186                         return -EINVAL;
 187                 }
 188                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 189
 190                 return 0;
 191         }
 192
 193         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 194              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 195             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 196                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
 197                                         dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
 198                 /* skip non-supported classes */
 199                 return -EINVAL;
 200         }
 201
 202         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 203                 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
 204                 return -EINVAL;
 205         }
 206
 207         if (! snd_usb_parse_audio_interface(chip, interface)) {
 208                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 209                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 210                 return -EINVAL;
 211         }
 212
 213         return 0;
 214 }
 215
 216 /*
 217  * parse audio control descriptor and create pcm/midi streams
 218  */
 219 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 220 {
 221         struct usb_device *dev = chip->dev;
 222         struct usb_host_interface *host_iface;
 223         struct usb_interface_descriptor *altsd;
 224         void *control_header;
 225         int i, protocol;
 226
 227         /* find audiocontrol interface */
 228         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 229         control_header = snd_usb_find_csint_desc(host_iface->extra,
 230                                                  host_iface->extralen,
 231                                                  NULL, UAC_HEADER);
 232         altsd = get_iface_desc(host_iface);
 233         protocol = altsd->bInterfaceProtocol;
 234
 235         if (!control_header) {
 236                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
 237                 return -EINVAL;
 238         }
 239
 240         switch (protocol) {
 241         default:
 242                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
 243                             protocol);
 244                 /* fall through */
 245
 246         case UAC_VERSION_1: {
 247                 struct uac1_ac_header_descriptor *h1 = control_header;
 248
 249                 if (!h1->bInCollection) {
 250                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
 251                         return -EINVAL;
 252                 }
 253
 254                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 255                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
 256                         return -EINVAL;
 257                 }
 258
 259                 for (i = 0; i < h1->bInCollection; i++)
 260                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 261
 262                 break;
 263         }
 264
 265         case UAC_VERSION_2: {
 266                 struct usb_interface_assoc_descriptor *assoc =
 267                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 268
 269                 if (!assoc) {
 270                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
 271                         return -EINVAL;
 272                 }
 273
 274                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 275                         int intf = assoc->bFirstInterface + i;
 276
 277                         if (intf != ctrlif)
 278                                 snd_usb_create_stream(chip, ctrlif, intf);
 279                 }
 280
 281                 break;
 282         }
 283         }
 284
 285         return 0;
 286 }
 287
 288 /*
 289  * free the chip instance
 290  *
 291  * here we have to do not much, since pcm and controls are already freed
 292  *
 293  */
 294
 295 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 296 {
 297         kfree(chip);
 298         return 0;
 299 }
 300
 301 static int snd_usb_audio_dev_free(struct snd_device *device)
 302 {
 303         struct snd_usb_audio *chip = device->device_data;
 304         return snd_usb_audio_free(chip);
 305 }
 306
 307 static void remove_trailing_spaces(char *str)
 308 {
 309         char *p;
 310
 311         if (!*str)
 312                 return;
 313         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 314                 *p = 0;
 315 }
 316
 317 /*
 318  * create a chip instance and set its names.
 319  */
 320 static int snd_usb_audio_create(struct usb_device *dev, int idx,
 321                                 const struct snd_usb_audio_quirk *quirk,
 322                                 struct snd_usb_audio **rchip)
 323 {
 324         struct snd_card *card;
 325         struct snd_usb_audio *chip;
 326         int err, len;
 327         char component[14];
 328         static struct snd_device_ops ops = {
 329                 .dev_free =     snd_usb_audio_dev_free,
 330         };
 331
 332         *rchip = NULL;
 333
 334         switch (snd_usb_get_speed(dev)) {
 335         case USB_SPEED_LOW:
 336         case USB_SPEED_FULL:
 337         case USB_SPEED_HIGH:
 338         case USB_SPEED_SUPER:
 339                 break;
 340         default:
 341                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
 342                 return -ENXIO;
 343         }
 344
 345         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
 346         if (err < 0) {
 347                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
 348                 return err;
 349         }
 350
 351         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 352         if (! chip) {
 353                 snd_card_free(card);
 354                 return -ENOMEM;
 355         }
 356
 357         init_rwsem(&chip->shutdown_rwsem);
 358         chip->index = idx;
 359         chip->dev = dev;
 360         chip->card = card;
 361         chip->setup = device_setup[idx];
 362         chip->nrpacks = nrpacks;
 363         chip->async_unlink = async_unlink;
 364         chip->probing = 1;
 365
 366         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 367                               le16_to_cpu(dev->descriptor.idProduct));
 368         INIT_LIST_HEAD(&chip->pcm_list);
 369         INIT_LIST_HEAD(&chip->midi_list);
 370         INIT_LIST_HEAD(&chip->mixer_list);
 371
 372         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 373                 snd_usb_audio_free(chip);
 374                 snd_card_free(card);
 375                 return err;
 376         }
 377
 378         strcpy(card->driver, "USB-Audio");
 379         sprintf(component, "USB%04x:%04x",
 380                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 381         snd_component_add(card, component);
 382
 383         /* retrieve the device string as shortname */
 384         if (quirk && quirk->product_name && *quirk->product_name) {
 385                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 386         } else {
 387                 if (!dev->descriptor.iProduct ||
 388                     usb_string(dev, dev->descriptor.iProduct,
 389                     card->shortname, sizeof(card->shortname)) <= 0) {
 390                         /* no name available from anywhere, so use ID */
 391                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 392                                 USB_ID_VENDOR(chip->usb_id),
 393                                 USB_ID_PRODUCT(chip->usb_id));
 394                 }
 395         }
 396         remove_trailing_spaces(card->shortname);
 397
 398         /* retrieve the vendor and device strings as longname */
 399         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 400                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 401         } else {
 402                 if (dev->descriptor.iManufacturer)
 403                         len = usb_string(dev, dev->descriptor.iManufacturer,
 404                                          card->longname, sizeof(card->longname));
 405                 else
 406                         len = 0;
 407                 /* we don't really care if there isn't any vendor string */
 408         }
 409         if (len > 0) {
 410                 remove_trailing_spaces(card->longname);
 411                 if (*card->longname)
 412                         strlcat(card->longname, " ", sizeof(card->longname));
 413         }
 414
 415         strlcat(card->longname, card->shortname, sizeof(card->longname));
 416
 417         len = strlcat(card->longname, " at ", sizeof(card->longname));
 418
 419         if (len < sizeof(card->longname))
 420                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 421
 422         switch (snd_usb_get_speed(dev)) {
 423         case USB_SPEED_LOW:
 424                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 425                 break;
 426         case USB_SPEED_FULL:
 427                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 428                 break;
 429         case USB_SPEED_HIGH:
 430                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 431                 break;
 432         case USB_SPEED_SUPER:
 433                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 434                 break;
 435         default:
 436                 break;
 437         }
 438
 439         snd_usb_audio_create_proc(chip);
 440
 441         *rchip = chip;
 442         return 0;
 443 }
 444
 445 /*
 446  * probe the active usb device
 447  *
 448  * note that this can be called multiple times per a device, when it
 449  * includes multiple audio control interfaces.
 450  *
 451  * thus we check the usb device pointer and creates the card instance
 452  * only at the first time.  the successive calls of this function will
 453  * append the pcm interface to the corresponding card.
 454  */
 455 static struct snd_usb_audio *
 456 snd_usb_audio_probe(struct usb_device *dev,
 457                     struct usb_interface *intf,
 458                     const struct usb_device_id *usb_id)
 459 {
 460         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 461         int i, err;
 462         struct snd_usb_audio *chip;
 463         struct usb_host_interface *alts;
 464         int ifnum;
 465         u32 id;
 466
 467         alts = &intf->altsetting[0];
 468         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 469         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 470                     le16_to_cpu(dev->descriptor.idProduct));
 471         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 472                 goto __err_val;
 473
 474         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
 475                 goto __err_val;
 476
 477         /*
 478          * found a config.  now register to ALSA
 479          */
 480
 481         /* check whether it's already registered */
 482         chip = NULL;
 483         mutex_lock(&register_mutex);
 484         for (i = 0; i < SNDRV_CARDS; i++) {
 485                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 486                         if (usb_chip[i]->shutdown) {
 487                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
 488                                 goto __error;
 489                         }
 490                         chip = usb_chip[i];
 491                         chip->probing = 1;
 492                         break;
 493                 }
 494         }
 495         if (! chip) {
 496                 /* it's a fresh one.
 497                  * now look for an empty slot and create a new card instance
 498                  */
 499                 for (i = 0; i < SNDRV_CARDS; i++)
 500                         if (enable[i] && ! usb_chip[i] &&
 501                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 502                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 503                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
 504                                         goto __error;
 505                                 }
 506                                 snd_card_set_dev(chip->card, &intf->dev);
 507                                 chip->pm_intf = intf;
 508                                 break;
 509                         }
 510                 if (!chip) {
 511                         printk(KERN_ERR "no available usb audio device\n");
 512                         goto __error;
 513                 }
 514         }
 515
 516         /*
 517          * For devices with more than one control interface, we assume the
 518          * first contains the audio controls. We might need a more specific
 519          * check here in the future.
 520          */
 521         if (!chip->ctrl_intf)
 522                 chip->ctrl_intf = alts;
 523
 524         chip->txfr_quirk = 0;
 525         err = 1; /* continue */
 526         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 527                 /* need some special handlings */
 528                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
 529                         goto __error;
 530         }
 531
 532         if (err > 0) {
 533                 /* create normal USB audio interfaces */
 534                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
 535                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
 536                         goto __error;
 537                 }
 538         }
 539
 540         /* we are allowed to call snd_card_register() many times */
 541         if (snd_card_register(chip->card) < 0) {
 542                 goto __error;
 543         }
 544
 545         usb_chip[chip->index] = chip;
 546         chip->num_interfaces++;
 547         chip->probing = 0;
 548         mutex_unlock(&register_mutex);
 549         return chip;
 550
 551  __error:
 552         if (chip) {
 553                 if (!chip->num_interfaces)
 554                         snd_card_free(chip->card);
 555                 chip->probing = 0;
 556         }
 557         mutex_unlock(&register_mutex);
 558  __err_val:
 559         return NULL;
 560 }
 561
 562 /*
 563  * we need to take care of counter, since disconnection can be called also
 564  * many times as well as usb_audio_probe().
 565  */
 566 static void snd_usb_audio_disconnect(struct usb_device *dev,
 567                                      struct snd_usb_audio *chip)
 568 {
 569         struct snd_card *card;
 570         struct list_head *p;
 571         bool was_shutdown;
 572
 573         if (chip == (void *)-1L)
 574                 return;
 575
 576         card = chip->card;
 577         down_write(&chip->shutdown_rwsem);
 578         was_shutdown = chip->shutdown;
 579         chip->shutdown = 1;
 580         up_write(&chip->shutdown_rwsem);
 581
 582         mutex_lock(&register_mutex);
 583         if (!was_shutdown) {
 584                 snd_card_disconnect(card);
 585                 /* release the pcm resources */
 586                 list_for_each(p, &chip->pcm_list) {
 587                         snd_usb_stream_disconnect(p);
 588                 }
 589                 /* release the midi resources */
 590                 list_for_each(p, &chip->midi_list) {
 591                         snd_usbmidi_disconnect(p);
 592                 }
 593                 /* release mixer resources */
 594                 list_for_each(p, &chip->mixer_list) {
 595                         snd_usb_mixer_disconnect(p);
 596                 }
 597         }
 598
 599         chip->num_interfaces--;
 600         if (chip->num_interfaces <= 0) {
 601                 usb_chip[chip->index] = NULL;
 602                 mutex_unlock(&register_mutex);
 603                 snd_card_free_when_closed(card);
 604         } else {
 605                 mutex_unlock(&register_mutex);
 606         }
 607 }
 608
 609 /*
 610  * new 2.5 USB kernel API
 611  */
 612 static int usb_audio_probe(struct usb_interface *intf,
 613                            const struct usb_device_id *id)
 614 {
 615         struct snd_usb_audio *chip;
 616         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
 617         if (chip) {
 618                 usb_set_intfdata(intf, chip);
 619                 return 0;
 620         } else
 621                 return -EIO;
 622 }
 623
 624 static void usb_audio_disconnect(struct usb_interface *intf)
 625 {
 626         snd_usb_audio_disconnect(interface_to_usbdev(intf),
 627                                  usb_get_intfdata(intf));
 628 }
 629
 630 #ifdef CONFIG_PM
 631
 632 int snd_usb_autoresume(struct snd_usb_audio *chip)
 633 {
 634         int err = -ENODEV;
 635
 636         down_read(&chip->shutdown_rwsem);
 637         if (chip->probing)
 638                 err = 0;
 639         else if (!chip->shutdown)
 640                 err = usb_autopm_get_interface(chip->pm_intf);
 641         up_read(&chip->shutdown_rwsem);
 642
 643         return err;
 644 }
 645
 646 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 647 {
 648         down_read(&chip->shutdown_rwsem);
 649         if (!chip->shutdown && !chip->probing)
 650                 usb_autopm_put_interface(chip->pm_intf);
 651         up_read(&chip->shutdown_rwsem);
 652 }
 653
 654 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 655 {
 656         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 657         struct list_head *p;
 658         struct snd_usb_stream *as;
 659         struct usb_mixer_interface *mixer;
 660
 661         if (chip == (void *)-1L)
 662                 return 0;
 663
 664         if (!PMSG_IS_AUTO(message)) {
 665                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 666                 if (!chip->num_suspended_intf++) {
 667                         list_for_each(p, &chip->pcm_list) {
 668                                 as = list_entry(p, struct snd_usb_stream, list);
 669                                 snd_pcm_suspend_all(as->pcm);
 670                         }
 671                 }
 672         } else {
 673                 /*
 674                  * otherwise we keep the rest of the system in the dark
 675                  * to keep this transparent
 676                  */
 677                 if (!chip->num_suspended_intf++)
 678                         chip->autosuspended = 1;
 679         }
 680
 681         list_for_each_entry(mixer, &chip->mixer_list, list)
 682                 snd_usb_mixer_inactivate(mixer);
 683
 684         return 0;
 685 }
 686
 687 static int usb_audio_resume(struct usb_interface *intf)
 688 {
 689         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 690         struct usb_mixer_interface *mixer;
 691         int err = 0;
 692
 693         if (chip == (void *)-1L)
 694                 return 0;
 695         if (--chip->num_suspended_intf)
 696                 return 0;
 697         /*
 698          * ALSA leaves material resumption to user space
 699          * we just notify and restart the mixers
 700          */
 701         list_for_each_entry(mixer, &chip->mixer_list, list) {
 702                 err = snd_usb_mixer_activate(mixer);
 703                 if (err < 0)
 704                         goto err_out;
 705         }
 706
 707         if (!chip->autosuspended)
 708                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 709         chip->autosuspended = 0;
 710
 711 err_out:
 712         return err;
 713 }
 714 #else
 715 #define usb_audio_suspend       NULL
 716 #define usb_audio_resume        NULL
 717 #endif          /* CONFIG_PM */
 718
 719 static struct usb_device_id usb_audio_ids [] = {
 720 #include "quirks-table.h"
 721     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 722       .bInterfaceClass = USB_CLASS_AUDIO,
 723       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 724     { }                                         /* Terminating entry */
 725 };
 726
 727 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
 728
 729 /*
 730  * entry point for linux usb interface
 731  */
 732
 733 static struct usb_driver usb_audio_driver = {
 734         .name =         "snd-usb-audio",
 735         .probe =        usb_audio_probe,
 736         .disconnect =   usb_audio_disconnect,
 737         .suspend =      usb_audio_suspend,
 738         .resume =       usb_audio_resume,
 739         .id_table =     usb_audio_ids,
 740         .supports_autosuspend = 1,
 741 };
 742
 743 static int __init snd_usb_audio_init(void)
 744 {
 745         if (nrpacks < 1 || nrpacks > MAX_PACKS) {
 746                 printk(KERN_WARNING "invalid nrpacks value.\n");
 747                 return -EINVAL;
 748         }
 749         return usb_register(&usb_audio_driver);
 750 }
 751
 752 static void __exit snd_usb_audio_cleanup(void)
 753 {
 754         usb_deregister(&usb_audio_driver);
 755 }
 756
 757 module_init(snd_usb_audio_init);
 758 module_exit(snd_usb_audio_cleanup);