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 bool 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 bool async_unlink = 1;
  87 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  88 static bool 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                 subs->interface = -1;
 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                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
 149                            dev->devnum, ctrlif, interface);
 150                 return -EINVAL;
 151         }
 152
 153         if (usb_interface_claimed(iface)) {
 154                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
 155                                                 dev->devnum, ctrlif, interface);
 156                 return -EINVAL;
 157         }
 158
 159         alts = &iface->altsetting[0];
 160         altsd = get_iface_desc(alts);
 161         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 162              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 163             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 164                 int err = snd_usbmidi_create(chip->card, iface,
 165                                              &chip->midi_list, NULL);
 166                 if (err < 0) {
 167                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
 168                                                 dev->devnum, ctrlif, interface);
 169                         return -EINVAL;
 170                 }
 171                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 172
 173                 return 0;
 174         }
 175
 176         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 177              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 178             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 179                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
 180                                         dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
 181                 /* skip non-supported classes */
 182                 return -EINVAL;
 183         }
 184
 185         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 186                 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
 187                 return -EINVAL;
 188         }
 189
 190         if (! snd_usb_parse_audio_interface(chip, interface)) {
 191                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 192                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 193                 return -EINVAL;
 194         }
 195
 196         return 0;
 197 }
 198
 199 /*
 200  * parse audio control descriptor and create pcm/midi streams
 201  */
 202 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 203 {
 204         struct usb_device *dev = chip->dev;
 205         struct usb_host_interface *host_iface;
 206         struct usb_interface_descriptor *altsd;
 207         void *control_header;
 208         int i, protocol;
 209
 210         /* find audiocontrol interface */
 211         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 212         control_header = snd_usb_find_csint_desc(host_iface->extra,
 213                                                  host_iface->extralen,
 214                                                  NULL, UAC_HEADER);
 215         altsd = get_iface_desc(host_iface);
 216         protocol = altsd->bInterfaceProtocol;
 217
 218         if (!control_header) {
 219                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
 220                 return -EINVAL;
 221         }
 222
 223         switch (protocol) {
 224         default:
 225                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
 226                             protocol);
 227                 /* fall through */
 228
 229         case UAC_VERSION_1: {
 230                 struct uac1_ac_header_descriptor *h1 = control_header;
 231
 232                 if (!h1->bInCollection) {
 233                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
 234                         return -EINVAL;
 235                 }
 236
 237                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 238                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
 239                         return -EINVAL;
 240                 }
 241
 242                 for (i = 0; i < h1->bInCollection; i++)
 243                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 244
 245                 break;
 246         }
 247
 248         case UAC_VERSION_2: {
 249                 struct usb_interface_assoc_descriptor *assoc =
 250                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 251
 252                 if (!assoc) {
 253                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
 254                         return -EINVAL;
 255                 }
 256
 257                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 258                         int intf = assoc->bFirstInterface + i;
 259
 260                         if (intf != ctrlif)
 261                                 snd_usb_create_stream(chip, ctrlif, intf);
 262                 }
 263
 264                 break;
 265         }
 266         }
 267
 268         return 0;
 269 }
 270
 271 /*
 272  * free the chip instance
 273  *
 274  * here we have to do not much, since pcm and controls are already freed
 275  *
 276  */
 277
 278 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 279 {
 280         mutex_destroy(&chip->mutex);
 281         kfree(chip);
 282         return 0;
 283 }
 284
 285 static int snd_usb_audio_dev_free(struct snd_device *device)
 286 {
 287         struct snd_usb_audio *chip = device->device_data;
 288         return snd_usb_audio_free(chip);
 289 }
 290
 291 static void remove_trailing_spaces(char *str)
 292 {
 293         char *p;
 294
 295         if (!*str)
 296                 return;
 297         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 298                 *p = 0;
 299 }
 300
 301 /*
 302  * create a chip instance and set its names.
 303  */
 304 static int snd_usb_audio_create(struct usb_device *dev, int idx,
 305                                 const struct snd_usb_audio_quirk *quirk,
 306                                 struct snd_usb_audio **rchip)
 307 {
 308         struct snd_card *card;
 309         struct snd_usb_audio *chip;
 310         int err, len;
 311         char component[14];
 312         static struct snd_device_ops ops = {
 313                 .dev_free =     snd_usb_audio_dev_free,
 314         };
 315
 316         *rchip = NULL;
 317
 318         switch (snd_usb_get_speed(dev)) {
 319         case USB_SPEED_LOW:
 320         case USB_SPEED_FULL:
 321         case USB_SPEED_HIGH:
 322         case USB_SPEED_SUPER:
 323                 break;
 324         default:
 325                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
 326                 return -ENXIO;
 327         }
 328
 329         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
 330         if (err < 0) {
 331                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
 332                 return err;
 333         }
 334
 335         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 336         if (! chip) {
 337                 snd_card_free(card);
 338                 return -ENOMEM;
 339         }
 340
 341         mutex_init(&chip->mutex);
 342         mutex_init(&chip->shutdown_mutex);
 343         chip->index = idx;
 344         chip->dev = dev;
 345         chip->card = card;
 346         chip->setup = device_setup[idx];
 347         chip->nrpacks = nrpacks;
 348         chip->async_unlink = async_unlink;
 349         chip->probing = 1;
 350
 351         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 352                               le16_to_cpu(dev->descriptor.idProduct));
 353         INIT_LIST_HEAD(&chip->pcm_list);
 354         INIT_LIST_HEAD(&chip->ep_list);
 355         INIT_LIST_HEAD(&chip->midi_list);
 356         INIT_LIST_HEAD(&chip->mixer_list);
 357
 358         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 359                 snd_usb_audio_free(chip);
 360                 snd_card_free(card);
 361                 return err;
 362         }
 363
 364         strcpy(card->driver, "USB-Audio");
 365         sprintf(component, "USB%04x:%04x",
 366                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 367         snd_component_add(card, component);
 368
 369         /* retrieve the device string as shortname */
 370         if (quirk && quirk->product_name && *quirk->product_name) {
 371                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 372         } else {
 373                 if (!dev->descriptor.iProduct ||
 374                     usb_string(dev, dev->descriptor.iProduct,
 375                     card->shortname, sizeof(card->shortname)) <= 0) {
 376                         /* no name available from anywhere, so use ID */
 377                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 378                                 USB_ID_VENDOR(chip->usb_id),
 379                                 USB_ID_PRODUCT(chip->usb_id));
 380                 }
 381         }
 382         remove_trailing_spaces(card->shortname);
 383
 384         /* retrieve the vendor and device strings as longname */
 385         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 386                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 387         } else {
 388                 if (dev->descriptor.iManufacturer)
 389                         len = usb_string(dev, dev->descriptor.iManufacturer,
 390                                          card->longname, sizeof(card->longname));
 391                 else
 392                         len = 0;
 393                 /* we don't really care if there isn't any vendor string */
 394         }
 395         if (len > 0) {
 396                 remove_trailing_spaces(card->longname);
 397                 if (*card->longname)
 398                         strlcat(card->longname, " ", sizeof(card->longname));
 399         }
 400
 401         strlcat(card->longname, card->shortname, sizeof(card->longname));
 402
 403         len = strlcat(card->longname, " at ", sizeof(card->longname));
 404
 405         if (len < sizeof(card->longname))
 406                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 407
 408         switch (snd_usb_get_speed(dev)) {
 409         case USB_SPEED_LOW:
 410                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 411                 break;
 412         case USB_SPEED_FULL:
 413                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 414                 break;
 415         case USB_SPEED_HIGH:
 416                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 417                 break;
 418         case USB_SPEED_SUPER:
 419                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 420                 break;
 421         default:
 422                 break;
 423         }
 424
 425         snd_usb_audio_create_proc(chip);
 426
 427         *rchip = chip;
 428         return 0;
 429 }
 430
 431 /*
 432  * probe the active usb device
 433  *
 434  * note that this can be called multiple times per a device, when it
 435  * includes multiple audio control interfaces.
 436  *
 437  * thus we check the usb device pointer and creates the card instance
 438  * only at the first time.  the successive calls of this function will
 439  * append the pcm interface to the corresponding card.
 440  */
 441 static struct snd_usb_audio *
 442 snd_usb_audio_probe(struct usb_device *dev,
 443                     struct usb_interface *intf,
 444                     const struct usb_device_id *usb_id)
 445 {
 446         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 447         int i, err;
 448         struct snd_usb_audio *chip;
 449         struct usb_host_interface *alts;
 450         int ifnum;
 451         u32 id;
 452
 453         alts = &intf->altsetting[0];
 454         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 455         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 456                     le16_to_cpu(dev->descriptor.idProduct));
 457         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 458                 goto __err_val;
 459
 460         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
 461                 goto __err_val;
 462
 463         /*
 464          * found a config.  now register to ALSA
 465          */
 466
 467         /* check whether it's already registered */
 468         chip = NULL;
 469         mutex_lock(&register_mutex);
 470         for (i = 0; i < SNDRV_CARDS; i++) {
 471                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 472                         if (usb_chip[i]->shutdown) {
 473                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
 474                                 goto __error;
 475                         }
 476                         chip = usb_chip[i];
 477                         chip->probing = 1;
 478                         break;
 479                 }
 480         }
 481         if (! chip) {
 482                 /* it's a fresh one.
 483                  * now look for an empty slot and create a new card instance
 484                  */
 485                 for (i = 0; i < SNDRV_CARDS; i++)
 486                         if (enable[i] && ! usb_chip[i] &&
 487                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 488                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 489                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
 490                                         goto __error;
 491                                 }
 492                                 snd_card_set_dev(chip->card, &intf->dev);
 493                                 chip->pm_intf = intf;
 494                                 break;
 495                         }
 496                 if (!chip) {
 497                         printk(KERN_ERR "no available usb audio device\n");
 498                         goto __error;
 499                 }
 500         }
 501
 502         /*
 503          * For devices with more than one control interface, we assume the
 504          * first contains the audio controls. We might need a more specific
 505          * check here in the future.
 506          */
 507         if (!chip->ctrl_intf)
 508                 chip->ctrl_intf = alts;
 509
 510         chip->txfr_quirk = 0;
 511         err = 1; /* continue */
 512         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 513                 /* need some special handlings */
 514                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
 515                         goto __error;
 516         }
 517
 518         if (err > 0) {
 519                 /* create normal USB audio interfaces */
 520                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
 521                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
 522                         goto __error;
 523                 }
 524         }
 525
 526         /* we are allowed to call snd_card_register() many times */
 527         if (snd_card_register(chip->card) < 0) {
 528                 goto __error;
 529         }
 530
 531         usb_chip[chip->index] = chip;
 532         chip->num_interfaces++;
 533         chip->probing = 0;
 534         mutex_unlock(&register_mutex);
 535         return chip;
 536
 537  __error:
 538         if (chip) {
 539                 if (!chip->num_interfaces)
 540                         snd_card_free(chip->card);
 541                 chip->probing = 0;
 542         }
 543         mutex_unlock(&register_mutex);
 544  __err_val:
 545         return NULL;
 546 }
 547
 548 /*
 549  * we need to take care of counter, since disconnection can be called also
 550  * many times as well as usb_audio_probe().
 551  */
 552 static void snd_usb_audio_disconnect(struct usb_device *dev,
 553                                      struct snd_usb_audio *chip)
 554 {
 555         struct snd_card *card;
 556         struct list_head *p;
 557
 558         if (chip == (void *)-1L)
 559                 return;
 560
 561         card = chip->card;
 562         mutex_lock(&register_mutex);
 563         mutex_lock(&chip->shutdown_mutex);
 564         chip->shutdown = 1;
 565         chip->num_interfaces--;
 566         if (chip->num_interfaces <= 0) {
 567                 snd_card_disconnect(card);
 568                 /* release the pcm resources */
 569                 list_for_each(p, &chip->pcm_list) {
 570                         snd_usb_stream_disconnect(p);
 571                 }
 572                 /* release the endpoint resources */
 573                 list_for_each(p, &chip->ep_list) {
 574                         snd_usb_endpoint_free(p);
 575                 }
 576                 /* release the midi resources */
 577                 list_for_each(p, &chip->midi_list) {
 578                         snd_usbmidi_disconnect(p);
 579                 }
 580                 /* release mixer resources */
 581                 list_for_each(p, &chip->mixer_list) {
 582                         snd_usb_mixer_disconnect(p);
 583                 }
 584                 usb_chip[chip->index] = NULL;
 585                 mutex_unlock(&chip->shutdown_mutex);
 586                 mutex_unlock(&register_mutex);
 587                 snd_card_free_when_closed(card);
 588         } else {
 589                 mutex_unlock(&chip->shutdown_mutex);
 590                 mutex_unlock(&register_mutex);
 591         }
 592 }
 593
 594 /*
 595  * new 2.5 USB kernel API
 596  */
 597 static int usb_audio_probe(struct usb_interface *intf,
 598                            const struct usb_device_id *id)
 599 {
 600         struct snd_usb_audio *chip;
 601         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
 602         if (chip) {
 603                 usb_set_intfdata(intf, chip);
 604                 return 0;
 605         } else
 606                 return -EIO;
 607 }
 608
 609 static void usb_audio_disconnect(struct usb_interface *intf)
 610 {
 611         snd_usb_audio_disconnect(interface_to_usbdev(intf),
 612                                  usb_get_intfdata(intf));
 613 }
 614
 615 #ifdef CONFIG_PM
 616
 617 int snd_usb_autoresume(struct snd_usb_audio *chip)
 618 {
 619         int err = -ENODEV;
 620
 621         if (!chip->shutdown && !chip->probing)
 622                 err = usb_autopm_get_interface(chip->pm_intf);
 623
 624         return err;
 625 }
 626
 627 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 628 {
 629         if (!chip->shutdown && !chip->probing)
 630                 usb_autopm_put_interface(chip->pm_intf);
 631 }
 632
 633 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 634 {
 635         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 636         struct list_head *p;
 637         struct snd_usb_stream *as;
 638         struct usb_mixer_interface *mixer;
 639
 640         if (chip == (void *)-1L)
 641                 return 0;
 642
 643         if (!PMSG_IS_AUTO(message)) {
 644                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 645                 if (!chip->num_suspended_intf++) {
 646                         list_for_each(p, &chip->pcm_list) {
 647                                 as = list_entry(p, struct snd_usb_stream, list);
 648                                 snd_pcm_suspend_all(as->pcm);
 649                         }
 650                 }
 651         } else {
 652                 /*
 653                  * otherwise we keep the rest of the system in the dark
 654                  * to keep this transparent
 655                  */
 656                 if (!chip->num_suspended_intf++)
 657                         chip->autosuspended = 1;
 658         }
 659
 660         list_for_each_entry(mixer, &chip->mixer_list, list)
 661                 snd_usb_mixer_inactivate(mixer);
 662
 663         return 0;
 664 }
 665
 666 static int usb_audio_resume(struct usb_interface *intf)
 667 {
 668         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 669         struct usb_mixer_interface *mixer;
 670         int err = 0;
 671
 672         if (chip == (void *)-1L)
 673                 return 0;
 674         if (--chip->num_suspended_intf)
 675                 return 0;
 676         /*
 677          * ALSA leaves material resumption to user space
 678          * we just notify and restart the mixers
 679          */
 680         list_for_each_entry(mixer, &chip->mixer_list, list) {
 681                 err = snd_usb_mixer_activate(mixer);
 682                 if (err < 0)
 683                         goto err_out;
 684         }
 685
 686         if (!chip->autosuspended)
 687                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 688         chip->autosuspended = 0;
 689
 690 err_out:
 691         return err;
 692 }
 693 #else
 694 #define usb_audio_suspend       NULL
 695 #define usb_audio_resume        NULL
 696 #endif          /* CONFIG_PM */
 697
 698 static struct usb_device_id usb_audio_ids [] = {
 699 #include "quirks-table.h"
 700     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 701       .bInterfaceClass = USB_CLASS_AUDIO,
 702       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 703     { }                                         /* Terminating entry */
 704 };
 705
 706 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
 707
 708 /*
 709  * entry point for linux usb interface
 710  */
 711
 712 static struct usb_driver usb_audio_driver = {
 713         .name =         "snd-usb-audio",
 714         .probe =        usb_audio_probe,
 715         .disconnect =   usb_audio_disconnect,
 716         .suspend =      usb_audio_suspend,
 717         .resume =       usb_audio_resume,
 718         .id_table =     usb_audio_ids,
 719         .supports_autosuspend = 1,
 720 };
 721
 722 static int __init snd_usb_audio_init(void)
 723 {
 724         if (nrpacks < 1 || nrpacks > MAX_PACKS) {
 725                 printk(KERN_WARNING "invalid nrpacks value.\n");
 726                 return -EINVAL;
 727         }
 728         return usb_register(&usb_audio_driver);
 729 }
 730
 731 static void __exit snd_usb_audio_cleanup(void)
 732 {
 733         usb_deregister(&usb_audio_driver);
 734 }
 735
 736 module_init(snd_usb_audio_init);
 737 module_exit(snd_usb_audio_cleanup);