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 device_setup[SNDRV_CARDS]; /* device parameter for this card */
  83 static bool ignore_ctl_error;
  84 static bool autoclock = true;
  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_array(device_setup, int, NULL, 0444);
  97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
  98 module_param(ignore_ctl_error, bool, 0444);
  99 MODULE_PARM_DESC(ignore_ctl_error,
 100                  "Ignore errors from USB controller for mixer interfaces.");
 101 module_param(autoclock, bool, 0444);
 102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
 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 usb_audio_disconnect()
 116  */
 117 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
 118 {
 119         int idx;
 120         struct snd_usb_substream *subs;
 121
 122         for (idx = 0; idx < 2; idx++) {
 123                 subs = &as->substream[idx];
 124                 if (!subs->num_formats)
 125                         continue;
 126                 subs->interface = -1;
 127                 subs->data_endpoint = NULL;
 128                 subs->sync_endpoint = NULL;
 129         }
 130 }
 131
 132 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 133 {
 134         struct usb_device *dev = chip->dev;
 135         struct usb_host_interface *alts;
 136         struct usb_interface_descriptor *altsd;
 137         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 138
 139         if (!iface) {
 140                 dev_err(&dev->dev, "%u:%d : does not exist\n",
 141                         ctrlif, interface);
 142                 return -EINVAL;
 143         }
 144
 145         alts = &iface->altsetting[0];
 146         altsd = get_iface_desc(alts);
 147
 148         /*
 149          * Android with both accessory and audio interfaces enabled gets the
 150          * interface numbers wrong.
 151          */
 152         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 153              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 154             interface == 0 &&
 155             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 156             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 157                 interface = 2;
 158                 iface = usb_ifnum_to_if(dev, interface);
 159                 if (!iface)
 160                         return -EINVAL;
 161                 alts = &iface->altsetting[0];
 162                 altsd = get_iface_desc(alts);
 163         }
 164
 165         if (usb_interface_claimed(iface)) {
 166                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
 167                         ctrlif, interface);
 168                 return -EINVAL;
 169         }
 170
 171         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 172              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 173             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 174                 int err = snd_usbmidi_create(chip->card, iface,
 175                                              &chip->midi_list, NULL);
 176                 if (err < 0) {
 177                         dev_err(&dev->dev,
 178                                 "%u:%d: cannot create sequencer device\n",
 179                                 ctrlif, interface);
 180                         return -EINVAL;
 181                 }
 182                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 183
 184                 return 0;
 185         }
 186
 187         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 188              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 189             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 190                 dev_dbg(&dev->dev,
 191                         "%u:%d: skipping non-supported interface %d\n",
 192                         ctrlif, interface, altsd->bInterfaceClass);
 193                 /* skip non-supported classes */
 194                 return -EINVAL;
 195         }
 196
 197         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
 198                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
 199                 return -EINVAL;
 200         }
 201
 202         if (! snd_usb_parse_audio_interface(chip, interface)) {
 203                 usb_set_interface(dev, interface, 0); /* reset the current interface */
 204                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 205                 return -EINVAL;
 206         }
 207
 208         return 0;
 209 }
 210
 211 /*
 212  * parse audio control descriptor and create pcm/midi streams
 213  */
 214 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 215 {
 216         struct usb_device *dev = chip->dev;
 217         struct usb_host_interface *host_iface;
 218         struct usb_interface_descriptor *altsd;
 219         void *control_header;
 220         int i, protocol;
 221
 222         /* find audiocontrol interface */
 223         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
 224         control_header = snd_usb_find_csint_desc(host_iface->extra,
 225                                                  host_iface->extralen,
 226                                                  NULL, UAC_HEADER);
 227         altsd = get_iface_desc(host_iface);
 228         protocol = altsd->bInterfaceProtocol;
 229
 230         if (!control_header) {
 231                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
 232                 return -EINVAL;
 233         }
 234
 235         switch (protocol) {
 236         default:
 237                 dev_warn(&dev->dev,
 238                          "unknown interface protocol %#02x, assuming v1\n",
 239                          protocol);
 240                 /* fall through */
 241
 242         case UAC_VERSION_1: {
 243                 struct uac1_ac_header_descriptor *h1 = control_header;
 244
 245                 if (!h1->bInCollection) {
 246                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
 247                         return -EINVAL;
 248                 }
 249
 250                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 251                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
 252                         return -EINVAL;
 253                 }
 254
 255                 for (i = 0; i < h1->bInCollection; i++)
 256                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 257
 258                 break;
 259         }
 260
 261         case UAC_VERSION_2: {
 262                 struct usb_interface_assoc_descriptor *assoc =
 263                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 264
 265                 if (!assoc) {
 266                         /*
 267                          * Firmware writers cannot count to three.  So to find
 268                          * the IAD on the NuForce UDH-100, also check the next
 269                          * interface.
 270                          */
 271                         struct usb_interface *iface =
 272                                 usb_ifnum_to_if(dev, ctrlif + 1);
 273                         if (iface &&
 274                             iface->intf_assoc &&
 275                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 276                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 277                                 assoc = iface->intf_assoc;
 278                 }
 279
 280                 if (!assoc) {
 281                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
 282                         return -EINVAL;
 283                 }
 284
 285                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 286                         int intf = assoc->bFirstInterface + i;
 287
 288                         if (intf != ctrlif)
 289                                 snd_usb_create_stream(chip, ctrlif, intf);
 290                 }
 291
 292                 break;
 293         }
 294         }
 295
 296         return 0;
 297 }
 298
 299 /*
 300  * free the chip instance
 301  *
 302  * here we have to do not much, since pcm and controls are already freed
 303  *
 304  */
 305
 306 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 307 {
 308         struct snd_usb_endpoint *ep, *n;
 309
 310         list_for_each_entry_safe(ep, n, &chip->ep_list, list)
 311                 snd_usb_endpoint_free(ep);
 312
 313         mutex_destroy(&chip->mutex);
 314         kfree(chip);
 315         return 0;
 316 }
 317
 318 static int snd_usb_audio_dev_free(struct snd_device *device)
 319 {
 320         struct snd_usb_audio *chip = device->device_data;
 321         return snd_usb_audio_free(chip);
 322 }
 323
 324 static void remove_trailing_spaces(char *str)
 325 {
 326         char *p;
 327
 328         if (!*str)
 329                 return;
 330         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 331                 *p = 0;
 332 }
 333
 334 /*
 335  * create a chip instance and set its names.
 336  */
 337 static int snd_usb_audio_create(struct usb_interface *intf,
 338                                 struct usb_device *dev, int idx,
 339                                 const struct snd_usb_audio_quirk *quirk,
 340                                 struct snd_usb_audio **rchip)
 341 {
 342         struct snd_card *card;
 343         struct snd_usb_audio *chip;
 344         int err, len;
 345         char component[14];
 346         static struct snd_device_ops ops = {
 347                 .dev_free =     snd_usb_audio_dev_free,
 348         };
 349
 350         *rchip = NULL;
 351
 352         switch (snd_usb_get_speed(dev)) {
 353         case USB_SPEED_LOW:
 354         case USB_SPEED_FULL:
 355         case USB_SPEED_HIGH:
 356         case USB_SPEED_WIRELESS:
 357         case USB_SPEED_SUPER:
 358                 break;
 359         default:
 360                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
 361                 return -ENXIO;
 362         }
 363
 364         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
 365                            0, &card);
 366         if (err < 0) {
 367                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
 368                 return err;
 369         }
 370
 371         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 372         if (! chip) {
 373                 snd_card_free(card);
 374                 return -ENOMEM;
 375         }
 376
 377         mutex_init(&chip->mutex);
 378         init_rwsem(&chip->shutdown_rwsem);
 379         chip->index = idx;
 380         chip->dev = dev;
 381         chip->card = card;
 382         chip->setup = device_setup[idx];
 383         chip->autoclock = autoclock;
 384         chip->probing = 1;
 385
 386         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 387                               le16_to_cpu(dev->descriptor.idProduct));
 388         INIT_LIST_HEAD(&chip->pcm_list);
 389         INIT_LIST_HEAD(&chip->ep_list);
 390         INIT_LIST_HEAD(&chip->midi_list);
 391         INIT_LIST_HEAD(&chip->mixer_list);
 392
 393         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 394                 snd_usb_audio_free(chip);
 395                 snd_card_free(card);
 396                 return err;
 397         }
 398
 399         strcpy(card->driver, "USB-Audio");
 400         sprintf(component, "USB%04x:%04x",
 401                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 402         snd_component_add(card, component);
 403
 404         /* retrieve the device string as shortname */
 405         if (quirk && quirk->product_name && *quirk->product_name) {
 406                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 407         } else {
 408                 if (!dev->descriptor.iProduct ||
 409                     usb_string(dev, dev->descriptor.iProduct,
 410                     card->shortname, sizeof(card->shortname)) <= 0) {
 411                         /* no name available from anywhere, so use ID */
 412                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 413                                 USB_ID_VENDOR(chip->usb_id),
 414                                 USB_ID_PRODUCT(chip->usb_id));
 415                 }
 416         }
 417         remove_trailing_spaces(card->shortname);
 418
 419         /* retrieve the vendor and device strings as longname */
 420         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 421                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 422         } else {
 423                 if (dev->descriptor.iManufacturer)
 424                         len = usb_string(dev, dev->descriptor.iManufacturer,
 425                                          card->longname, sizeof(card->longname));
 426                 else
 427                         len = 0;
 428                 /* we don't really care if there isn't any vendor string */
 429         }
 430         if (len > 0) {
 431                 remove_trailing_spaces(card->longname);
 432                 if (*card->longname)
 433                         strlcat(card->longname, " ", sizeof(card->longname));
 434         }
 435
 436         strlcat(card->longname, card->shortname, sizeof(card->longname));
 437
 438         len = strlcat(card->longname, " at ", sizeof(card->longname));
 439
 440         if (len < sizeof(card->longname))
 441                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 442
 443         switch (snd_usb_get_speed(dev)) {
 444         case USB_SPEED_LOW:
 445                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 446                 break;
 447         case USB_SPEED_FULL:
 448                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 449                 break;
 450         case USB_SPEED_HIGH:
 451                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 452                 break;
 453         case USB_SPEED_SUPER:
 454                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 455                 break;
 456         default:
 457                 break;
 458         }
 459
 460         snd_usb_audio_create_proc(chip);
 461
 462         *rchip = chip;
 463         return 0;
 464 }
 465
 466 /*
 467  * probe the active usb device
 468  *
 469  * note that this can be called multiple times per a device, when it
 470  * includes multiple audio control interfaces.
 471  *
 472  * thus we check the usb device pointer and creates the card instance
 473  * only at the first time.  the successive calls of this function will
 474  * append the pcm interface to the corresponding card.
 475  */
 476 static int usb_audio_probe(struct usb_interface *intf,
 477                            const struct usb_device_id *usb_id)
 478 {
 479         struct usb_device *dev = interface_to_usbdev(intf);
 480         const struct snd_usb_audio_quirk *quirk =
 481                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 482         struct snd_usb_audio *chip;
 483         int i, err;
 484         struct usb_host_interface *alts;
 485         int ifnum;
 486         u32 id;
 487
 488         alts = &intf->altsetting[0];
 489         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 490         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 491                     le16_to_cpu(dev->descriptor.idProduct));
 492         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 493                 return -ENXIO;
 494
 495         err = snd_usb_apply_boot_quirk(dev, intf, quirk);
 496         if (err < 0)
 497                 return err;
 498
 499         /*
 500          * found a config.  now register to ALSA
 501          */
 502
 503         /* check whether it's already registered */
 504         chip = NULL;
 505         mutex_lock(&register_mutex);
 506         for (i = 0; i < SNDRV_CARDS; i++) {
 507                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 508                         if (usb_chip[i]->shutdown) {
 509                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
 510                                 err = -EIO;
 511                                 goto __error;
 512                         }
 513                         chip = usb_chip[i];
 514                         chip->probing = 1;
 515                         break;
 516                 }
 517         }
 518         if (! chip) {
 519                 /* it's a fresh one.
 520                  * now look for an empty slot and create a new card instance
 521                  */
 522                 for (i = 0; i < SNDRV_CARDS; i++)
 523                         if (enable[i] && ! usb_chip[i] &&
 524                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 525                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 526                                 err = snd_usb_audio_create(intf, dev, i, quirk,
 527                                                            &chip);
 528                                 if (err < 0)
 529                                         goto __error;
 530                                 chip->pm_intf = intf;
 531                                 break;
 532                         }
 533                 if (!chip) {
 534                         dev_err(&dev->dev, "no available usb audio device\n");
 535                         err = -ENODEV;
 536                         goto __error;
 537                 }
 538         }
 539
 540         /*
 541          * For devices with more than one control interface, we assume the
 542          * first contains the audio controls. We might need a more specific
 543          * check here in the future.
 544          */
 545         if (!chip->ctrl_intf)
 546                 chip->ctrl_intf = alts;
 547
 548         chip->txfr_quirk = 0;
 549         err = 1; /* continue */
 550         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 551                 /* need some special handlings */
 552                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
 553                 if (err < 0)
 554                         goto __error;
 555         }
 556
 557         if (err > 0) {
 558                 /* create normal USB audio interfaces */
 559                 err = snd_usb_create_streams(chip, ifnum);
 560                 if (err < 0)
 561                         goto __error;
 562                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
 563                 if (err < 0)
 564                         goto __error;
 565         }
 566
 567         /* we are allowed to call snd_card_register() many times */
 568         err = snd_card_register(chip->card);
 569         if (err < 0)
 570                 goto __error;
 571
 572         usb_chip[chip->index] = chip;
 573         chip->num_interfaces++;
 574         chip->probing = 0;
 575         usb_set_intfdata(intf, chip);
 576         mutex_unlock(&register_mutex);
 577         return 0;
 578
 579  __error:
 580         if (chip) {
 581                 if (!chip->num_interfaces)
 582                         snd_card_free(chip->card);
 583                 chip->probing = 0;
 584         }
 585         mutex_unlock(&register_mutex);
 586         return err;
 587 }
 588
 589 /*
 590  * we need to take care of counter, since disconnection can be called also
 591  * many times as well as usb_audio_probe().
 592  */
 593 static void usb_audio_disconnect(struct usb_interface *intf)
 594 {
 595         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 596         struct snd_card *card;
 597         struct list_head *p;
 598
 599         if (chip == (void *)-1L)
 600                 return;
 601
 602         card = chip->card;
 603         down_write(&chip->shutdown_rwsem);
 604         chip->shutdown = 1;
 605         up_write(&chip->shutdown_rwsem);
 606
 607         mutex_lock(&register_mutex);
 608         chip->num_interfaces--;
 609         if (chip->num_interfaces <= 0) {
 610                 struct snd_usb_stream *as;
 611                 struct snd_usb_endpoint *ep;
 612                 struct usb_mixer_interface *mixer;
 613
 614                 snd_card_disconnect(card);
 615                 /* release the pcm resources */
 616                 list_for_each_entry(as, &chip->pcm_list, list) {
 617                         snd_usb_stream_disconnect(as);
 618                 }
 619                 /* release the endpoint resources */
 620                 list_for_each_entry(ep, &chip->ep_list, list) {
 621                         snd_usb_endpoint_release(ep);
 622                 }
 623                 /* release the midi resources */
 624                 list_for_each(p, &chip->midi_list) {
 625                         snd_usbmidi_disconnect(p);
 626                 }
 627                 /* release mixer resources */
 628                 list_for_each_entry(mixer, &chip->mixer_list, list) {
 629                         snd_usb_mixer_disconnect(mixer);
 630                 }
 631                 usb_chip[chip->index] = NULL;
 632                 mutex_unlock(&register_mutex);
 633                 snd_card_free_when_closed(card);
 634         } else {
 635                 mutex_unlock(&register_mutex);
 636         }
 637 }
 638
 639 #ifdef CONFIG_PM
 640
 641 int snd_usb_autoresume(struct snd_usb_audio *chip)
 642 {
 643         int err = -ENODEV;
 644
 645         down_read(&chip->shutdown_rwsem);
 646         if (chip->probing && chip->in_pm)
 647                 err = 0;
 648         else if (!chip->shutdown)
 649                 err = usb_autopm_get_interface(chip->pm_intf);
 650         up_read(&chip->shutdown_rwsem);
 651
 652         return err;
 653 }
 654
 655 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 656 {
 657         down_read(&chip->shutdown_rwsem);
 658         if (!chip->shutdown && !chip->probing && !chip->in_pm)
 659                 usb_autopm_put_interface(chip->pm_intf);
 660         up_read(&chip->shutdown_rwsem);
 661 }
 662
 663 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 664 {
 665         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 666         struct snd_usb_stream *as;
 667         struct usb_mixer_interface *mixer;
 668         struct list_head *p;
 669
 670         if (chip == (void *)-1L)
 671                 return 0;
 672
 673         if (!PMSG_IS_AUTO(message)) {
 674                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 675                 if (!chip->num_suspended_intf++) {
 676                         list_for_each_entry(as, &chip->pcm_list, list) {
 677                                 snd_pcm_suspend_all(as->pcm);
 678                                 as->substream[0].need_setup_ep =
 679                                         as->substream[1].need_setup_ep = true;
 680                         }
 681                         list_for_each(p, &chip->midi_list) {
 682                                 snd_usbmidi_suspend(p);
 683                         }
 684                 }
 685         } else {
 686                 /*
 687                  * otherwise we keep the rest of the system in the dark
 688                  * to keep this transparent
 689                  */
 690                 if (!chip->num_suspended_intf++)
 691                         chip->autosuspended = 1;
 692         }
 693
 694         if (chip->num_suspended_intf == 1)
 695                 list_for_each_entry(mixer, &chip->mixer_list, list)
 696                         snd_usb_mixer_suspend(mixer);
 697
 698         return 0;
 699 }
 700
 701 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
 702 {
 703         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 704         struct usb_mixer_interface *mixer;
 705         struct list_head *p;
 706         int err = 0;
 707
 708         if (chip == (void *)-1L)
 709                 return 0;
 710         if (--chip->num_suspended_intf)
 711                 return 0;
 712
 713         chip->in_pm = 1;
 714         /*
 715          * ALSA leaves material resumption to user space
 716          * we just notify and restart the mixers
 717          */
 718         list_for_each_entry(mixer, &chip->mixer_list, list) {
 719                 err = snd_usb_mixer_resume(mixer, reset_resume);
 720                 if (err < 0)
 721                         goto err_out;
 722         }
 723
 724         list_for_each(p, &chip->midi_list) {
 725                 snd_usbmidi_resume(p);
 726         }
 727
 728         if (!chip->autosuspended)
 729                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 730         chip->autosuspended = 0;
 731
 732 err_out:
 733         chip->in_pm = 0;
 734         return err;
 735 }
 736
 737 static int usb_audio_resume(struct usb_interface *intf)
 738 {
 739         return __usb_audio_resume(intf, false);
 740 }
 741
 742 static int usb_audio_reset_resume(struct usb_interface *intf)
 743 {
 744         return __usb_audio_resume(intf, true);
 745 }
 746 #else
 747 #define usb_audio_suspend       NULL
 748 #define usb_audio_resume        NULL
 749 #define usb_audio_reset_resume  NULL
 750 #endif          /* CONFIG_PM */
 751
 752 static struct usb_device_id usb_audio_ids [] = {
 753 #include "quirks-table.h"
 754     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 755       .bInterfaceClass = USB_CLASS_AUDIO,
 756       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 757     { }                                         /* Terminating entry */
 758 };
 759 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 760
 761 /*
 762  * entry point for linux usb interface
 763  */
 764
 765 static struct usb_driver usb_audio_driver = {
 766         .name =         "snd-usb-audio",
 767         .probe =        usb_audio_probe,
 768         .disconnect =   usb_audio_disconnect,
 769         .suspend =      usb_audio_suspend,
 770         .resume =       usb_audio_resume,
 771         .reset_resume = usb_audio_reset_resume,
 772         .id_table =     usb_audio_ids,
 773         .supports_autosuspend = 1,
 774 };
 775
 776 module_usb_driver(usb_audio_driver);