linux/sound/usb/card.c
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   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
  73MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  74MODULE_DESCRIPTION("USB Audio");
  75MODULE_LICENSE("GPL");
  76MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  77
  78
  79static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  80static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  81static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
  82/* Vendor/product IDs for this card */
  83static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  84static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
  85static int nrpacks = 8;         /* max. number of packets per urb */
  86static bool async_unlink = 1;
  87static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
  88static bool ignore_ctl_error;
  89
  90module_param_array(index, int, NULL, 0444);
  91MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  92module_param_array(id, charp, NULL, 0444);
  93MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  94module_param_array(enable, bool, NULL, 0444);
  95MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  96module_param_array(vid, int, NULL, 0444);
  97MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  98module_param_array(pid, int, NULL, 0444);
  99MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
 100module_param(nrpacks, int, 0644);
 101MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
 102module_param(async_unlink, bool, 0444);
 103MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
 104module_param_array(device_setup, int, NULL, 0444);
 105MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 106module_param(ignore_ctl_error, bool, 0444);
 107MODULE_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
 115static DEFINE_MUTEX(register_mutex);
 116static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 117static struct usb_driver usb_audio_driver;
 118
 119/*
 120 * disconnect streams
 121 * called from snd_usb_audio_disconnect()
 122 */
 123static 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
 140static 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 */
 202static 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
 278static int snd_usb_audio_free(struct snd_usb_audio *chip)
 279{
 280        mutex_destroy(&chip->mutex);
 281        kfree(chip);
 282        return 0;
 283}
 284
 285static 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
 291static 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 */
 304static 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 */
 441static struct snd_usb_audio *
 442snd_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 */
 552static 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, *n;
 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_safe(p, n, &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 */
 597static 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
 609static 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
 617int 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
 627void 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
 633static 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
 666static 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
 690err_out:
 691        return err;
 692}
 693#else
 694#define usb_audio_suspend       NULL
 695#define usb_audio_resume        NULL
 696#endif          /* CONFIG_PM */
 697
 698static 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
 706MODULE_DEVICE_TABLE (usb, usb_audio_ids);
 707
 708/*
 709 * entry point for linux usb interface
 710 */
 711
 712static 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
 722static 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
 731static void __exit snd_usb_audio_cleanup(void)
 732{
 733        usb_deregister(&usb_audio_driver);
 734}
 735
 736module_init(snd_usb_audio_init);
 737module_exit(snd_usb_audio_cleanup);
 738
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