sound/usb/stream.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <linux/usb/audio-v2.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/control.h>
  27 #include <sound/tlv.h>
  28
  29 #include "usbaudio.h"
  30 #include "card.h"
  31 #include "proc.h"
  32 #include "quirks.h"
  33 #include "endpoint.h"
  34 #include "pcm.h"
  35 #include "helper.h"
  36 #include "format.h"
  37 #include "clock.h"
  38 #include "stream.h"
  39
  40 /*
  41  * free a substream
  42  */
  43 static void free_substream(struct snd_usb_substream *subs)
  44 {
  45         struct audioformat *fp, *n;
  46
  47         if (!subs->num_formats)
  48                 return; /* not initialized */
  49         list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
  50                 kfree(fp->rate_table);
  51                 kfree(fp->chmap);
  52                 kfree(fp);
  53         }
  54         kfree(subs->rate_list.list);
  55 }
  56
  57
  58 /*
  59  * free a usb stream instance
  60  */
  61 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
  62 {
  63         free_substream(&stream->substream[0]);
  64         free_substream(&stream->substream[1]);
  65         list_del(&stream->list);
  66         kfree(stream);
  67 }
  68
  69 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
  70 {
  71         struct snd_usb_stream *stream = pcm->private_data;
  72         if (stream) {
  73                 stream->pcm = NULL;
  74                 snd_usb_audio_stream_free(stream);
  75         }
  76 }
  77
  78 /*
  79  * initialize the substream instance.
  80  */
  81
  82 static void snd_usb_init_substream(struct snd_usb_stream *as,
  83                                    int stream,
  84                                    struct audioformat *fp)
  85 {
  86         struct snd_usb_substream *subs = &as->substream[stream];
  87
  88         INIT_LIST_HEAD(&subs->fmt_list);
  89         spin_lock_init(&subs->lock);
  90
  91         subs->stream = as;
  92         subs->direction = stream;
  93         subs->dev = as->chip->dev;
  94         subs->txfr_quirk = as->chip->txfr_quirk;
  95         subs->speed = snd_usb_get_speed(subs->dev);
  96         subs->pkt_offset_adj = 0;
  97
  98         snd_usb_set_pcm_ops(as->pcm, stream);
  99
 100         list_add_tail(&fp->list, &subs->fmt_list);
 101         subs->formats |= fp->formats;
 102         subs->num_formats++;
 103         subs->fmt_type = fp->fmt_type;
 104         subs->ep_num = fp->endpoint;
 105         if (fp->channels > subs->channels_max)
 106                 subs->channels_max = fp->channels;
 107 }
 108
 109 /* kctl callbacks for usb-audio channel maps */
 110 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
 111                               struct snd_ctl_elem_info *uinfo)
 112 {
 113         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 114         struct snd_usb_substream *subs = info->private_data;
 115
 116         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 117         uinfo->count = subs->channels_max;
 118         uinfo->value.integer.min = 0;
 119         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
 120         return 0;
 121 }
 122
 123 /* check whether a duplicated entry exists in the audiofmt list */
 124 static bool have_dup_chmap(struct snd_usb_substream *subs,
 125                            struct audioformat *fp)
 126 {
 127         struct list_head *p;
 128
 129         for (p = fp->list.prev; p != &subs->fmt_list; p = p->prev) {
 130                 struct audioformat *prev;
 131                 prev = list_entry(p, struct audioformat, list);
 132                 if (prev->chmap &&
 133                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
 134                         return true;
 135         }
 136         return false;
 137 }
 138
 139 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 140                              unsigned int size, unsigned int __user *tlv)
 141 {
 142         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 143         struct snd_usb_substream *subs = info->private_data;
 144         struct audioformat *fp;
 145         unsigned int __user *dst;
 146         int count = 0;
 147
 148         if (size < 8)
 149                 return -ENOMEM;
 150         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
 151                 return -EFAULT;
 152         size -= 8;
 153         dst = tlv + 2;
 154         list_for_each_entry(fp, &subs->fmt_list, list) {
 155                 int i, ch_bytes;
 156
 157                 if (!fp->chmap)
 158                         continue;
 159                 if (have_dup_chmap(subs, fp))
 160                         continue;
 161                 /* copy the entry */
 162                 ch_bytes = fp->chmap->channels * 4;
 163                 if (size < 8 + ch_bytes)
 164                         return -ENOMEM;
 165                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
 166                     put_user(ch_bytes, dst + 1))
 167                         return -EFAULT;
 168                 dst += 2;
 169                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
 170                         if (put_user(fp->chmap->map[i], dst))
 171                                 return -EFAULT;
 172                 }
 173
 174                 count += 8 + ch_bytes;
 175                 size -= 8 + ch_bytes;
 176         }
 177         if (put_user(count, tlv + 1))
 178                 return -EFAULT;
 179         return 0;
 180 }
 181
 182 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
 183                              struct snd_ctl_elem_value *ucontrol)
 184 {
 185         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 186         struct snd_usb_substream *subs = info->private_data;
 187         struct snd_pcm_chmap_elem *chmap = NULL;
 188         int i;
 189
 190         memset(ucontrol->value.integer.value, 0,
 191                sizeof(ucontrol->value.integer.value));
 192         if (subs->cur_audiofmt)
 193                 chmap = subs->cur_audiofmt->chmap;
 194         if (chmap) {
 195                 for (i = 0; i < chmap->channels; i++)
 196                         ucontrol->value.integer.value[i] = chmap->map[i];
 197         }
 198         return 0;
 199 }
 200
 201 /* create a chmap kctl assigned to the given USB substream */
 202 static int add_chmap(struct snd_pcm *pcm, int stream,
 203                      struct snd_usb_substream *subs)
 204 {
 205         struct audioformat *fp;
 206         struct snd_pcm_chmap *chmap;
 207         struct snd_kcontrol *kctl;
 208         int err;
 209
 210         list_for_each_entry(fp, &subs->fmt_list, list)
 211                 if (fp->chmap)
 212                         goto ok;
 213         /* no chmap is found */
 214         return 0;
 215
 216  ok:
 217         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
 218         if (err < 0)
 219                 return err;
 220
 221         /* override handlers */
 222         chmap->private_data = subs;
 223         kctl = chmap->kctl;
 224         kctl->info = usb_chmap_ctl_info;
 225         kctl->get = usb_chmap_ctl_get;
 226         kctl->tlv.c = usb_chmap_ctl_tlv;
 227
 228         return 0;
 229 }
 230
 231 /* convert from USB ChannelConfig bits to ALSA chmap element */
 232 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 233                                                 int protocol)
 234 {
 235         static unsigned int uac1_maps[] = {
 236                 SNDRV_CHMAP_FL,         /* left front */
 237                 SNDRV_CHMAP_FR,         /* right front */
 238                 SNDRV_CHMAP_FC,         /* center front */
 239                 SNDRV_CHMAP_LFE,        /* LFE */
 240                 SNDRV_CHMAP_SL,         /* left surround */
 241                 SNDRV_CHMAP_SR,         /* right surround */
 242                 SNDRV_CHMAP_FLC,        /* left of center */
 243                 SNDRV_CHMAP_FRC,        /* right of center */
 244                 SNDRV_CHMAP_RC,         /* surround */
 245                 SNDRV_CHMAP_SL,         /* side left */
 246                 SNDRV_CHMAP_SR,         /* side right */
 247                 SNDRV_CHMAP_TC,         /* top */
 248                 0 /* terminator */
 249         };
 250         static unsigned int uac2_maps[] = {
 251                 SNDRV_CHMAP_FL,         /* front left */
 252                 SNDRV_CHMAP_FR,         /* front right */
 253                 SNDRV_CHMAP_FC,         /* front center */
 254                 SNDRV_CHMAP_LFE,        /* LFE */
 255                 SNDRV_CHMAP_RL,         /* back left */
 256                 SNDRV_CHMAP_RR,         /* back right */
 257                 SNDRV_CHMAP_FLC,        /* front left of center */
 258                 SNDRV_CHMAP_FRC,        /* front right of center */
 259                 SNDRV_CHMAP_RC,         /* back center */
 260                 SNDRV_CHMAP_SL,         /* side left */
 261                 SNDRV_CHMAP_SR,         /* side right */
 262                 SNDRV_CHMAP_TC,         /* top center */
 263                 SNDRV_CHMAP_TFL,        /* top front left */
 264                 SNDRV_CHMAP_TFC,        /* top front center */
 265                 SNDRV_CHMAP_TFR,        /* top front right */
 266                 SNDRV_CHMAP_TRL,        /* top back left */
 267                 SNDRV_CHMAP_TRC,        /* top back center */
 268                 SNDRV_CHMAP_TRR,        /* top back right */
 269                 SNDRV_CHMAP_TFLC,       /* top front left of center */
 270                 SNDRV_CHMAP_TFRC,       /* top front right of center */
 271                 SNDRV_CHMAP_LLFE,       /* left LFE */
 272                 SNDRV_CHMAP_RLFE,       /* right LFE */
 273                 SNDRV_CHMAP_TSL,        /* top side left */
 274                 SNDRV_CHMAP_TSR,        /* top side right */
 275                 SNDRV_CHMAP_BC,         /* bottom center */
 276                 SNDRV_CHMAP_BLC,        /* bottom left center */
 277                 SNDRV_CHMAP_BRC,        /* bottom right center */
 278                 0 /* terminator */
 279         };
 280         struct snd_pcm_chmap_elem *chmap;
 281         const unsigned int *maps;
 282         int c;
 283
 284         if (!bits)
 285                 return NULL;
 286         if (channels > ARRAY_SIZE(chmap->map))
 287                 return NULL;
 288
 289         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 290         if (!chmap)
 291                 return NULL;
 292
 293         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
 294         chmap->channels = channels;
 295         c = 0;
 296         for (; bits && *maps; maps++, bits >>= 1) {
 297                 if (bits & 1)
 298                         chmap->map[c++] = *maps;
 299         }
 300
 301         for (; c < channels; c++)
 302                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 303
 304         return chmap;
 305 }
 306
 307 /*
 308  * add this endpoint to the chip instance.
 309  * if a stream with the same endpoint already exists, append to it.
 310  * if not, create a new pcm stream.
 311  */
 312 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 313                              int stream,
 314                              struct audioformat *fp)
 315 {
 316         struct snd_usb_stream *as;
 317         struct snd_usb_substream *subs;
 318         struct snd_pcm *pcm;
 319         int err;
 320
 321         list_for_each_entry(as, &chip->pcm_list, list) {
 322                 if (as->fmt_type != fp->fmt_type)
 323                         continue;
 324                 subs = &as->substream[stream];
 325                 if (subs->ep_num == fp->endpoint) {
 326                         list_add_tail(&fp->list, &subs->fmt_list);
 327                         subs->num_formats++;
 328                         subs->formats |= fp->formats;
 329                         return 0;
 330                 }
 331         }
 332         /* look for an empty stream */
 333         list_for_each_entry(as, &chip->pcm_list, list) {
 334                 if (as->fmt_type != fp->fmt_type)
 335                         continue;
 336                 subs = &as->substream[stream];
 337                 if (subs->ep_num)
 338                         continue;
 339                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 340                 if (err < 0)
 341                         return err;
 342                 snd_usb_init_substream(as, stream, fp);
 343                 return add_chmap(as->pcm, stream, subs);
 344         }
 345
 346         /* create a new pcm */
 347         as = kzalloc(sizeof(*as), GFP_KERNEL);
 348         if (!as)
 349                 return -ENOMEM;
 350         as->pcm_index = chip->pcm_devs;
 351         as->chip = chip;
 352         as->fmt_type = fp->fmt_type;
 353         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 354                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 355                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 356                           &pcm);
 357         if (err < 0) {
 358                 kfree(as);
 359                 return err;
 360         }
 361         as->pcm = pcm;
 362         pcm->private_data = as;
 363         pcm->private_free = snd_usb_audio_pcm_free;
 364         pcm->info_flags = 0;
 365         if (chip->pcm_devs > 0)
 366                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 367         else
 368                 strcpy(pcm->name, "USB Audio");
 369
 370         snd_usb_init_substream(as, stream, fp);
 371
 372         list_add(&as->list, &chip->pcm_list);
 373         chip->pcm_devs++;
 374
 375         snd_usb_proc_pcm_format_add(as);
 376
 377         return add_chmap(pcm, stream, &as->substream[stream]);
 378 }
 379
 380 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 381                                          struct usb_host_interface *alts,
 382                                          int protocol, int iface_no)
 383 {
 384         /* parsed with a v1 header here. that's ok as we only look at the
 385          * header first which is the same for both versions */
 386         struct uac_iso_endpoint_descriptor *csep;
 387         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 388         int attributes = 0;
 389
 390         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 391
 392         /* Creamware Noah has this descriptor after the 2nd endpoint */
 393         if (!csep && altsd->bNumEndpoints >= 2)
 394                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 395
 396         /*
 397          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
 398          * bytes after the first endpoint, go search the entire interface.
 399          * Some devices have it directly *before* the standard endpoint.
 400          */
 401         if (!csep)
 402                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
 403
 404         if (!csep || csep->bLength < 7 ||
 405             csep->bDescriptorSubtype != UAC_EP_GENERAL) {
 406                 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
 407                            " class specific endpoint descriptor\n",
 408                            chip->dev->devnum, iface_no,
 409                            altsd->bAlternateSetting);
 410                 return 0;
 411         }
 412
 413         if (protocol == UAC_VERSION_1) {
 414                 attributes = csep->bmAttributes;
 415         } else {
 416                 struct uac2_iso_endpoint_descriptor *csep2 =
 417                         (struct uac2_iso_endpoint_descriptor *) csep;
 418
 419                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 420
 421                 /* emulate the endpoint attributes of a v1 device */
 422                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 423                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 424         }
 425
 426         return attributes;
 427 }
 428
 429 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
 430  * terminal id
 431  */
 432 static void *
 433 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 434                                                int terminal_id)
 435 {
 436         struct uac2_input_terminal_descriptor *term = NULL;
 437
 438         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 439                                                ctrl_iface->extralen,
 440                                                term, UAC_INPUT_TERMINAL))) {
 441                 if (term->bTerminalID == terminal_id)
 442                         return term;
 443         }
 444
 445         return NULL;
 446 }
 447
 448 static struct uac2_output_terminal_descriptor *
 449         snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 450                                                 int terminal_id)
 451 {
 452         struct uac2_output_terminal_descriptor *term = NULL;
 453
 454         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 455                                                ctrl_iface->extralen,
 456                                                term, UAC_OUTPUT_TERMINAL))) {
 457                 if (term->bTerminalID == terminal_id)
 458                         return term;
 459         }
 460
 461         return NULL;
 462 }
 463
 464 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
 465 {
 466         struct usb_device *dev;
 467         struct usb_interface *iface;
 468         struct usb_host_interface *alts;
 469         struct usb_interface_descriptor *altsd;
 470         int i, altno, err, stream;
 471         unsigned int format = 0, num_channels = 0;
 472         struct audioformat *fp = NULL;
 473         int num, protocol, clock = 0;
 474         struct uac_format_type_i_continuous_descriptor *fmt;
 475         unsigned int chconfig;
 476
 477         dev = chip->dev;
 478
 479         /* parse the interface's altsettings */
 480         iface = usb_ifnum_to_if(dev, iface_no);
 481
 482         num = iface->num_altsetting;
 483
 484         /*
 485          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
 486          * one misses syncpipe, and does not produce any sound.
 487          */
 488         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
 489                 num = 4;
 490
 491         for (i = 0; i < num; i++) {
 492                 alts = &iface->altsetting[i];
 493                 altsd = get_iface_desc(alts);
 494                 protocol = altsd->bInterfaceProtocol;
 495                 /* skip invalid one */
 496                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 497                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 498                     (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
 499                      altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
 500                     altsd->bNumEndpoints < 1 ||
 501                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
 502                         continue;
 503                 /* must be isochronous */
 504                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
 505                     USB_ENDPOINT_XFER_ISOC)
 506                         continue;
 507                 /* check direction */
 508                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
 509                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 510                 altno = altsd->bAlternateSetting;
 511
 512                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
 513                         continue;
 514
 515                 chconfig = 0;
 516                 /* get audio formats */
 517                 switch (protocol) {
 518                 default:
 519                         snd_printdd(KERN_WARNING "%d:%u:%d: unknown interface protocol %#02x, assuming v1\n",
 520                                     dev->devnum, iface_no, altno, protocol);
 521                         protocol = UAC_VERSION_1;
 522                         /* fall through */
 523
 524                 case UAC_VERSION_1: {
 525                         struct uac1_as_header_descriptor *as =
 526                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
 527                         struct uac_input_terminal_descriptor *iterm;
 528
 529                         if (!as) {
 530                                 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
 531                                            dev->devnum, iface_no, altno);
 532                                 continue;
 533                         }
 534
 535                         if (as->bLength < sizeof(*as)) {
 536                                 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
 537                                            dev->devnum, iface_no, altno);
 538                                 continue;
 539                         }
 540
 541                         format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 542
 543                         iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 544                                                                        as->bTerminalLink);
 545                         if (iterm) {
 546                                 num_channels = iterm->bNrChannels;
 547                                 chconfig = le16_to_cpu(iterm->wChannelConfig);
 548                         }
 549
 550                         break;
 551                 }
 552
 553                 case UAC_VERSION_2: {
 554                         struct uac2_input_terminal_descriptor *input_term;
 555                         struct uac2_output_terminal_descriptor *output_term;
 556                         struct uac2_as_header_descriptor *as =
 557                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
 558
 559                         if (!as) {
 560                                 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
 561                                            dev->devnum, iface_no, altno);
 562                                 continue;
 563                         }
 564
 565                         if (as->bLength < sizeof(*as)) {
 566                                 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
 567                                            dev->devnum, iface_no, altno);
 568                                 continue;
 569                         }
 570
 571                         num_channels = as->bNrChannels;
 572                         format = le32_to_cpu(as->bmFormats);
 573
 574                         /* lookup the terminal associated to this interface
 575                          * to extract the clock */
 576                         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 577                                                                             as->bTerminalLink);
 578                         if (input_term) {
 579                                 clock = input_term->bCSourceID;
 580                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
 581                                 break;
 582                         }
 583
 584                         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
 585                                                                               as->bTerminalLink);
 586                         if (output_term) {
 587                                 clock = output_term->bCSourceID;
 588                                 break;
 589                         }
 590
 591                         snd_printk(KERN_ERR "%d:%u:%d : bogus bTerminalLink %d\n",
 592                                    dev->devnum, iface_no, altno, as->bTerminalLink);
 593                         continue;
 594                 }
 595                 }
 596
 597                 /* get format type */
 598                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
 599                 if (!fmt) {
 600                         snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
 601                                    dev->devnum, iface_no, altno);
 602                         continue;
 603                 }
 604                 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
 605                     ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
 606                         snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 607                                    dev->devnum, iface_no, altno);
 608                         continue;
 609                 }
 610
 611                 /*
 612                  * Blue Microphones workaround: The last altsetting is identical
 613                  * with the previous one, except for a larger packet size, but
 614                  * is actually a mislabeled two-channel setting; ignore it.
 615                  */
 616                 if (fmt->bNrChannels == 1 &&
 617                     fmt->bSubframeSize == 2 &&
 618                     altno == 2 && num == 3 &&
 619                     fp && fp->altsetting == 1 && fp->channels == 1 &&
 620                     fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
 621                     protocol == UAC_VERSION_1 &&
 622                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
 623                                                         fp->maxpacksize * 2)
 624                         continue;
 625
 626                 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 627                 if (! fp) {
 628                         snd_printk(KERN_ERR "cannot malloc\n");
 629                         return -ENOMEM;
 630                 }
 631
 632                 fp->iface = iface_no;
 633                 fp->altsetting = altno;
 634                 fp->altset_idx = i;
 635                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 636                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 637                 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 638                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 639                 fp->channels = num_channels;
 640                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
 641                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 642                                         * (fp->maxpacksize & 0x7ff);
 643                 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
 644                 fp->clock = clock;
 645                 fp->chmap = convert_chmap(num_channels, chconfig, protocol);
 646
 647                 /* some quirks for attributes here */
 648
 649                 switch (chip->usb_id) {
 650                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
 651                         /* Optoplay sets the sample rate attribute although
 652                          * it seems not supporting it in fact.
 653                          */
 654                         fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
 655                         break;
 656                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
 657                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 658                         /* doesn't set the sample rate attribute, but supports it */
 659                         fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
 660                         break;
 661                 case USB_ID(0x0763, 0x2001):  /* M-Audio Quattro USB */
 662                 case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
 663                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
 664                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
 665                                                 an older model 77d:223) */
 666                 /*
 667                  * plantronics headset and Griffin iMic have set adaptive-in
 668                  * although it's really not...
 669                  */
 670                         fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
 671                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 672                                 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
 673                         else
 674                                 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
 675                         break;
 676                 }
 677
 678                 /* ok, let's parse further... */
 679                 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
 680                         kfree(fp->rate_table);
 681                         kfree(fp->chmap);
 682                         kfree(fp);
 683                         fp = NULL;
 684                         continue;
 685                 }
 686
 687                 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
 688                 err = snd_usb_add_audio_stream(chip, stream, fp);
 689                 if (err < 0) {
 690                         kfree(fp->rate_table);
 691                         kfree(fp->chmap);
 692                         kfree(fp);
 693                         return err;
 694                 }
 695                 /* try to set the interface... */
 696                 usb_set_interface(chip->dev, iface_no, altno);
 697                 snd_usb_init_pitch(chip, iface_no, alts, fp);
 698                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
 699         }
 700         return 0;
 701 }
 702