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 snd_usb_audio_disconnect()
 116  */
 117 static void snd_usb_stream_disconnect(struct list_head *head)
 118 {
 119         int idx;
 120         struct snd_usb_stream *as;
 121         struct snd_usb_substream *subs;
 122
 123         as = list_entry(head, struct snd_usb_stream, list);
 124         for (idx = 0; idx < 2; idx++) {
 125                 subs = &as->substream[idx];
 126                 if (!subs->num_formats)
 127                         continue;
 128                 subs->interface = -1;
 129                 subs->data_endpoint = NULL;
 130                 subs->sync_endpoint = NULL;
 131         }
 132 }
 133
 134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
 135 {
 136         struct usb_device *dev = chip->dev;
 137         struct usb_host_interface *alts;
 138         struct usb_interface_descriptor *altsd;
 139         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
 140
 141         if (!iface) {
 142                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
 143                            dev->devnum, ctrlif, interface);
 144                 return -EINVAL;
 145         }
 146
 147         alts = &iface->altsetting[0];
 148         altsd = get_iface_desc(alts);
 149
 150         /*
 151          * Android with both accessory and audio interfaces enabled gets the
 152          * interface numbers wrong.
 153          */
 154         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
 155              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
 156             interface == 0 &&
 157             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 158             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
 159                 interface = 2;
 160                 iface = usb_ifnum_to_if(dev, interface);
 161                 if (!iface)
 162                         return -EINVAL;
 163                 alts = &iface->altsetting[0];
 164                 altsd = get_iface_desc(alts);
 165         }
 166
 167         if (usb_interface_claimed(iface)) {
 168                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
 169                                                 dev->devnum, ctrlif, interface);
 170                 return -EINVAL;
 171         }
 172
 173         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 174              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 175             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
 176                 int err = snd_usbmidi_create(chip->card, iface,
 177                                              &chip->midi_list, NULL);
 178                 if (err < 0) {
 179                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
 180                                                 dev->devnum, ctrlif, interface);
 181                         return -EINVAL;
 182                 }
 183                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
 184
 185                 return 0;
 186         }
 187
 188         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 189              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 190             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
 191                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
 192                                         dev->devnum, 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                 snd_printk(KERN_ERR "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                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
 232                 return -EINVAL;
 233         }
 234
 235         switch (protocol) {
 236         default:
 237                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
 238                             protocol);
 239                 /* fall through */
 240
 241         case UAC_VERSION_1: {
 242                 struct uac1_ac_header_descriptor *h1 = control_header;
 243
 244                 if (!h1->bInCollection) {
 245                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
 246                         return -EINVAL;
 247                 }
 248
 249                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
 250                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
 251                         return -EINVAL;
 252                 }
 253
 254                 for (i = 0; i < h1->bInCollection; i++)
 255                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
 256
 257                 break;
 258         }
 259
 260         case UAC_VERSION_2: {
 261                 struct usb_interface_assoc_descriptor *assoc =
 262                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
 263
 264                 if (!assoc) {
 265                         /*
 266                          * Firmware writers cannot count to three.  So to find
 267                          * the IAD on the NuForce UDH-100, also check the next
 268                          * interface.
 269                          */
 270                         struct usb_interface *iface =
 271                                 usb_ifnum_to_if(dev, ctrlif + 1);
 272                         if (iface &&
 273                             iface->intf_assoc &&
 274                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
 275                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
 276                                 assoc = iface->intf_assoc;
 277                 }
 278
 279                 if (!assoc) {
 280                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
 281                         return -EINVAL;
 282                 }
 283
 284                 for (i = 0; i < assoc->bInterfaceCount; i++) {
 285                         int intf = assoc->bFirstInterface + i;
 286
 287                         if (intf != ctrlif)
 288                                 snd_usb_create_stream(chip, ctrlif, intf);
 289                 }
 290
 291                 break;
 292         }
 293         }
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * free the chip instance
 300  *
 301  * here we have to do not much, since pcm and controls are already freed
 302  *
 303  */
 304
 305 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 306 {
 307         mutex_destroy(&chip->mutex);
 308         kfree(chip);
 309         return 0;
 310 }
 311
 312 static int snd_usb_audio_dev_free(struct snd_device *device)
 313 {
 314         struct snd_usb_audio *chip = device->device_data;
 315         return snd_usb_audio_free(chip);
 316 }
 317
 318 static void remove_trailing_spaces(char *str)
 319 {
 320         char *p;
 321
 322         if (!*str)
 323                 return;
 324         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
 325                 *p = 0;
 326 }
 327
 328 /*
 329  * create a chip instance and set its names.
 330  */
 331 static int snd_usb_audio_create(struct usb_device *dev, int idx,
 332                                 const struct snd_usb_audio_quirk *quirk,
 333                                 struct snd_usb_audio **rchip)
 334 {
 335         struct snd_card *card;
 336         struct snd_usb_audio *chip;
 337         int err, len;
 338         char component[14];
 339         static struct snd_device_ops ops = {
 340                 .dev_free =     snd_usb_audio_dev_free,
 341         };
 342
 343         *rchip = NULL;
 344
 345         switch (snd_usb_get_speed(dev)) {
 346         case USB_SPEED_LOW:
 347         case USB_SPEED_FULL:
 348         case USB_SPEED_HIGH:
 349         case USB_SPEED_SUPER:
 350                 break;
 351         default:
 352                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
 353                 return -ENXIO;
 354         }
 355
 356         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
 357         if (err < 0) {
 358                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
 359                 return err;
 360         }
 361
 362         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 363         if (! chip) {
 364                 snd_card_free(card);
 365                 return -ENOMEM;
 366         }
 367
 368         mutex_init(&chip->mutex);
 369         init_rwsem(&chip->shutdown_rwsem);
 370         chip->index = idx;
 371         chip->dev = dev;
 372         chip->card = card;
 373         chip->setup = device_setup[idx];
 374         chip->autoclock = autoclock;
 375         chip->probing = 1;
 376
 377         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 378                               le16_to_cpu(dev->descriptor.idProduct));
 379         INIT_LIST_HEAD(&chip->pcm_list);
 380         INIT_LIST_HEAD(&chip->ep_list);
 381         INIT_LIST_HEAD(&chip->midi_list);
 382         INIT_LIST_HEAD(&chip->mixer_list);
 383
 384         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 385                 snd_usb_audio_free(chip);
 386                 snd_card_free(card);
 387                 return err;
 388         }
 389
 390         strcpy(card->driver, "USB-Audio");
 391         sprintf(component, "USB%04x:%04x",
 392                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
 393         snd_component_add(card, component);
 394
 395         /* retrieve the device string as shortname */
 396         if (quirk && quirk->product_name && *quirk->product_name) {
 397                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
 398         } else {
 399                 if (!dev->descriptor.iProduct ||
 400                     usb_string(dev, dev->descriptor.iProduct,
 401                     card->shortname, sizeof(card->shortname)) <= 0) {
 402                         /* no name available from anywhere, so use ID */
 403                         sprintf(card->shortname, "USB Device %#04x:%#04x",
 404                                 USB_ID_VENDOR(chip->usb_id),
 405                                 USB_ID_PRODUCT(chip->usb_id));
 406                 }
 407         }
 408         remove_trailing_spaces(card->shortname);
 409
 410         /* retrieve the vendor and device strings as longname */
 411         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
 412                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
 413         } else {
 414                 if (dev->descriptor.iManufacturer)
 415                         len = usb_string(dev, dev->descriptor.iManufacturer,
 416                                          card->longname, sizeof(card->longname));
 417                 else
 418                         len = 0;
 419                 /* we don't really care if there isn't any vendor string */
 420         }
 421         if (len > 0) {
 422                 remove_trailing_spaces(card->longname);
 423                 if (*card->longname)
 424                         strlcat(card->longname, " ", sizeof(card->longname));
 425         }
 426
 427         strlcat(card->longname, card->shortname, sizeof(card->longname));
 428
 429         len = strlcat(card->longname, " at ", sizeof(card->longname));
 430
 431         if (len < sizeof(card->longname))
 432                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 433
 434         switch (snd_usb_get_speed(dev)) {
 435         case USB_SPEED_LOW:
 436                 strlcat(card->longname, ", low speed", sizeof(card->longname));
 437                 break;
 438         case USB_SPEED_FULL:
 439                 strlcat(card->longname, ", full speed", sizeof(card->longname));
 440                 break;
 441         case USB_SPEED_HIGH:
 442                 strlcat(card->longname, ", high speed", sizeof(card->longname));
 443                 break;
 444         case USB_SPEED_SUPER:
 445                 strlcat(card->longname, ", super speed", sizeof(card->longname));
 446                 break;
 447         default:
 448                 break;
 449         }
 450
 451         snd_usb_audio_create_proc(chip);
 452
 453         *rchip = chip;
 454         return 0;
 455 }
 456
 457 /*
 458  * probe the active usb device
 459  *
 460  * note that this can be called multiple times per a device, when it
 461  * includes multiple audio control interfaces.
 462  *
 463  * thus we check the usb device pointer and creates the card instance
 464  * only at the first time.  the successive calls of this function will
 465  * append the pcm interface to the corresponding card.
 466  */
 467 static struct snd_usb_audio *
 468 snd_usb_audio_probe(struct usb_device *dev,
 469                     struct usb_interface *intf,
 470                     const struct usb_device_id *usb_id)
 471 {
 472         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
 473         int i, err;
 474         struct snd_usb_audio *chip;
 475         struct usb_host_interface *alts;
 476         int ifnum;
 477         u32 id;
 478
 479         alts = &intf->altsetting[0];
 480         ifnum = get_iface_desc(alts)->bInterfaceNumber;
 481         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 482                     le16_to_cpu(dev->descriptor.idProduct));
 483         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 484                 goto __err_val;
 485
 486         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
 487                 goto __err_val;
 488
 489         /*
 490          * found a config.  now register to ALSA
 491          */
 492
 493         /* check whether it's already registered */
 494         chip = NULL;
 495         mutex_lock(&register_mutex);
 496         for (i = 0; i < SNDRV_CARDS; i++) {
 497                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
 498                         if (usb_chip[i]->shutdown) {
 499                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
 500                                 goto __error;
 501                         }
 502                         chip = usb_chip[i];
 503                         chip->probing = 1;
 504                         break;
 505                 }
 506         }
 507         if (! chip) {
 508                 /* it's a fresh one.
 509                  * now look for an empty slot and create a new card instance
 510                  */
 511                 for (i = 0; i < SNDRV_CARDS; i++)
 512                         if (enable[i] && ! usb_chip[i] &&
 513                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
 514                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
 515                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
 516                                         goto __error;
 517                                 }
 518                                 snd_card_set_dev(chip->card, &intf->dev);
 519                                 chip->pm_intf = intf;
 520                                 break;
 521                         }
 522                 if (!chip) {
 523                         printk(KERN_ERR "no available usb audio device\n");
 524                         goto __error;
 525                 }
 526         }
 527
 528         /*
 529          * For devices with more than one control interface, we assume the
 530          * first contains the audio controls. We might need a more specific
 531          * check here in the future.
 532          */
 533         if (!chip->ctrl_intf)
 534                 chip->ctrl_intf = alts;
 535
 536         chip->txfr_quirk = 0;
 537         err = 1; /* continue */
 538         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
 539                 /* need some special handlings */
 540                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
 541                         goto __error;
 542         }
 543
 544         if (err > 0) {
 545                 /* create normal USB audio interfaces */
 546                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
 547                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
 548                         goto __error;
 549                 }
 550         }
 551
 552         /* we are allowed to call snd_card_register() many times */
 553         if (snd_card_register(chip->card) < 0) {
 554                 goto __error;
 555         }
 556
 557         usb_chip[chip->index] = chip;
 558         chip->num_interfaces++;
 559         chip->probing = 0;
 560         mutex_unlock(&register_mutex);
 561         return chip;
 562
 563  __error:
 564         if (chip) {
 565                 if (!chip->num_interfaces)
 566                         snd_card_free(chip->card);
 567                 chip->probing = 0;
 568         }
 569         mutex_unlock(&register_mutex);
 570  __err_val:
 571         return NULL;
 572 }
 573
 574 /*
 575  * we need to take care of counter, since disconnection can be called also
 576  * many times as well as usb_audio_probe().
 577  */
 578 static void snd_usb_audio_disconnect(struct usb_device *dev,
 579                                      struct snd_usb_audio *chip)
 580 {
 581         struct snd_card *card;
 582         struct list_head *p, *n;
 583
 584         if (chip == (void *)-1L)
 585                 return;
 586
 587         card = chip->card;
 588         down_write(&chip->shutdown_rwsem);
 589         chip->shutdown = 1;
 590         up_write(&chip->shutdown_rwsem);
 591
 592         mutex_lock(&register_mutex);
 593         chip->num_interfaces--;
 594         if (chip->num_interfaces <= 0) {
 595                 snd_card_disconnect(card);
 596                 /* release the pcm resources */
 597                 list_for_each(p, &chip->pcm_list) {
 598                         snd_usb_stream_disconnect(p);
 599                 }
 600                 /* release the endpoint resources */
 601                 list_for_each_safe(p, n, &chip->ep_list) {
 602                         snd_usb_endpoint_free(p);
 603                 }
 604                 /* release the midi resources */
 605                 list_for_each(p, &chip->midi_list) {
 606                         snd_usbmidi_disconnect(p);
 607                 }
 608                 /* release mixer resources */
 609                 list_for_each(p, &chip->mixer_list) {
 610                         snd_usb_mixer_disconnect(p);
 611                 }
 612                 usb_chip[chip->index] = NULL;
 613                 mutex_unlock(&register_mutex);
 614                 snd_card_free_when_closed(card);
 615         } else {
 616                 mutex_unlock(&register_mutex);
 617         }
 618 }
 619
 620 /*
 621  * new 2.5 USB kernel API
 622  */
 623 static int usb_audio_probe(struct usb_interface *intf,
 624                            const struct usb_device_id *id)
 625 {
 626         struct snd_usb_audio *chip;
 627         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
 628         if (chip) {
 629                 usb_set_intfdata(intf, chip);
 630                 return 0;
 631         } else
 632                 return -EIO;
 633 }
 634
 635 static void usb_audio_disconnect(struct usb_interface *intf)
 636 {
 637         snd_usb_audio_disconnect(interface_to_usbdev(intf),
 638                                  usb_get_intfdata(intf));
 639 }
 640
 641 #ifdef CONFIG_PM
 642
 643 int snd_usb_autoresume(struct snd_usb_audio *chip)
 644 {
 645         int err = -ENODEV;
 646
 647         down_read(&chip->shutdown_rwsem);
 648         if (chip->probing)
 649                 err = 0;
 650         else if (!chip->shutdown)
 651                 err = usb_autopm_get_interface(chip->pm_intf);
 652         up_read(&chip->shutdown_rwsem);
 653
 654         return err;
 655 }
 656
 657 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 658 {
 659         down_read(&chip->shutdown_rwsem);
 660         if (!chip->shutdown && !chip->probing)
 661                 usb_autopm_put_interface(chip->pm_intf);
 662         up_read(&chip->shutdown_rwsem);
 663 }
 664
 665 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 666 {
 667         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 668         struct snd_usb_stream *as;
 669         struct usb_mixer_interface *mixer;
 670
 671         if (chip == (void *)-1L)
 672                 return 0;
 673
 674         if (!PMSG_IS_AUTO(message)) {
 675                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 676                 if (!chip->num_suspended_intf++) {
 677                         list_for_each_entry(as, &chip->pcm_list, list) {
 678                                 snd_pcm_suspend_all(as->pcm);
 679                                 as->substream[0].need_setup_ep =
 680                                         as->substream[1].need_setup_ep = true;
 681                         }
 682                 }
 683         } else {
 684                 /*
 685                  * otherwise we keep the rest of the system in the dark
 686                  * to keep this transparent
 687                  */
 688                 if (!chip->num_suspended_intf++)
 689                         chip->autosuspended = 1;
 690         }
 691
 692         list_for_each_entry(mixer, &chip->mixer_list, list)
 693                 snd_usb_mixer_inactivate(mixer);
 694
 695         return 0;
 696 }
 697
 698 static int usb_audio_resume(struct usb_interface *intf)
 699 {
 700         struct snd_usb_audio *chip = usb_get_intfdata(intf);
 701         struct usb_mixer_interface *mixer;
 702         int err = 0;
 703
 704         if (chip == (void *)-1L)
 705                 return 0;
 706         if (--chip->num_suspended_intf)
 707                 return 0;
 708         /*
 709          * ALSA leaves material resumption to user space
 710          * we just notify and restart the mixers
 711          */
 712         list_for_each_entry(mixer, &chip->mixer_list, list) {
 713                 err = snd_usb_mixer_activate(mixer);
 714                 if (err < 0)
 715                         goto err_out;
 716         }
 717
 718         if (!chip->autosuspended)
 719                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 720         chip->autosuspended = 0;
 721
 722 err_out:
 723         return err;
 724 }
 725 #else
 726 #define usb_audio_suspend       NULL
 727 #define usb_audio_resume        NULL
 728 #endif          /* CONFIG_PM */
 729
 730 static struct usb_device_id usb_audio_ids [] = {
 731 #include "quirks-table.h"
 732     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
 733       .bInterfaceClass = USB_CLASS_AUDIO,
 734       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
 735     { }                                         /* Terminating entry */
 736 };
 737 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
 738
 739 /*
 740  * entry point for linux usb interface
 741  */
 742
 743 static struct usb_driver usb_audio_driver = {
 744         .name =         "snd-usb-audio",
 745         .probe =        usb_audio_probe,
 746         .disconnect =   usb_audio_disconnect,
 747         .suspend =      usb_audio_suspend,
 748         .resume =       usb_audio_resume,
 749         .id_table =     usb_audio_ids,
 750         .supports_autosuspend = 1,
 751 };
 752
 753 static int __init snd_usb_audio_init(void)
 754 {
 755         return usb_register(&usb_audio_driver);
 756 }
 757
 758 static void __exit snd_usb_audio_cleanup(void)
 759 {
 760         usb_deregister(&usb_audio_driver);
 761 }
 762
 763 module_init(snd_usb_audio_init);
 764 module_exit(snd_usb_audio_cleanup);