sound/usb/stream.c

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This source file includes following definitions.
audioformat_free
free_substream
snd_usb_audio_stream_free
snd_usb_audio_pcm_free
snd_usb_init_substream
usb_chmap_ctl_info
have_dup_chmap
usb_chmap_ctl_tlv
usb_chmap_ctl_get
add_chmap
convert_chmap
convert_chmap_v3
__snd_usb_add_audio_stream
snd_usb_add_audio_stream
snd_usb_add_audio_stream_v3
parse_uac_endpoint_attributes
snd_usb_find_input_terminal_descriptor
snd_usb_find_output_terminal_descriptor
audio_format_alloc_init
snd_usb_get_audioformat_uac12
snd_usb_get_audioformat_uac3
__snd_usb_parse_audio_interface
snd_usb_parse_audio_interface
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4 
   5 
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/usb.h>
   9 #include <linux/usb/audio.h>
  10 #include <linux/usb/audio-v2.h>
  11 #include <linux/usb/audio-v3.h>
  12 
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/control.h>
  16 #include <sound/tlv.h>
  17 
  18 #include "usbaudio.h"
  19 #include "card.h"
  20 #include "proc.h"
  21 #include "quirks.h"
  22 #include "endpoint.h"
  23 #include "pcm.h"
  24 #include "helper.h"
  25 #include "format.h"
  26 #include "clock.h"
  27 #include "stream.h"
  28 #include "power.h"
  29 #include "media.h"
  30 
  31 static void audioformat_free(struct audioformat *fp)
  32 {
  33         list_del(&fp->list); /* unlink for avoiding double-free */
  34         kfree(fp->rate_table);
  35         kfree(fp->chmap);
  36         kfree(fp);
  37 }
  38 
  39 /*
  40  * free a substream
  41  */
  42 static void free_substream(struct snd_usb_substream *subs)
  43 {
  44         struct audioformat *fp, *n;
  45 
  46         if (!subs->num_formats)
  47                 return; /* not initialized */
  48         list_for_each_entry_safe(fp, n, &subs->fmt_list, list)
  49                 audioformat_free(fp);
  50         kfree(subs->rate_list.list);
  51         kfree(subs->str_pd);
  52         snd_media_stream_delete(subs);
  53 }
  54 
  55 
  56 /*
  57  * free a usb stream instance
  58  */
  59 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
  60 {
  61         free_substream(&stream->substream[0]);
  62         free_substream(&stream->substream[1]);
  63         list_del(&stream->list);
  64         kfree(stream);
  65 }
  66 
  67 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
  68 {
  69         struct snd_usb_stream *stream = pcm->private_data;
  70         if (stream) {
  71                 stream->pcm = NULL;
  72                 snd_usb_audio_stream_free(stream);
  73         }
  74 }
  75 
  76 /*
  77  * initialize the substream instance.
  78  */
  79 
  80 static void snd_usb_init_substream(struct snd_usb_stream *as,
  81                                    int stream,
  82                                    struct audioformat *fp,
  83                                    struct snd_usb_power_domain *pd)
  84 {
  85         struct snd_usb_substream *subs = &as->substream[stream];
  86 
  87         INIT_LIST_HEAD(&subs->fmt_list);
  88         spin_lock_init(&subs->lock);
  89 
  90         subs->stream = as;
  91         subs->direction = stream;
  92         subs->dev = as->chip->dev;
  93         subs->txfr_quirk = as->chip->txfr_quirk;
  94         subs->tx_length_quirk = as->chip->tx_length_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         if (pd) {
 109                 subs->str_pd = pd;
 110                 /* Initialize Power Domain to idle status D1 */
 111                 snd_usb_power_domain_set(subs->stream->chip, pd,
 112                                          UAC3_PD_STATE_D1);
 113         }
 114 
 115         snd_usb_preallocate_buffer(subs);
 116 }
 117 
 118 /* kctl callbacks for usb-audio channel maps */
 119 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
 120                               struct snd_ctl_elem_info *uinfo)
 121 {
 122         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 123         struct snd_usb_substream *subs = info->private_data;
 124 
 125         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 126         uinfo->count = subs->channels_max;
 127         uinfo->value.integer.min = 0;
 128         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
 129         return 0;
 130 }
 131 
 132 /* check whether a duplicated entry exists in the audiofmt list */
 133 static bool have_dup_chmap(struct snd_usb_substream *subs,
 134                            struct audioformat *fp)
 135 {
 136         struct audioformat *prev = fp;
 137 
 138         list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
 139                 if (prev->chmap &&
 140                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
 141                         return true;
 142         }
 143         return false;
 144 }
 145 
 146 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 147                              unsigned int size, unsigned int __user *tlv)
 148 {
 149         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 150         struct snd_usb_substream *subs = info->private_data;
 151         struct audioformat *fp;
 152         unsigned int __user *dst;
 153         int count = 0;
 154 
 155         if (size < 8)
 156                 return -ENOMEM;
 157         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
 158                 return -EFAULT;
 159         size -= 8;
 160         dst = tlv + 2;
 161         list_for_each_entry(fp, &subs->fmt_list, list) {
 162                 int i, ch_bytes;
 163 
 164                 if (!fp->chmap)
 165                         continue;
 166                 if (have_dup_chmap(subs, fp))
 167                         continue;
 168                 /* copy the entry */
 169                 ch_bytes = fp->chmap->channels * 4;
 170                 if (size < 8 + ch_bytes)
 171                         return -ENOMEM;
 172                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
 173                     put_user(ch_bytes, dst + 1))
 174                         return -EFAULT;
 175                 dst += 2;
 176                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
 177                         if (put_user(fp->chmap->map[i], dst))
 178                                 return -EFAULT;
 179                 }
 180 
 181                 count += 8 + ch_bytes;
 182                 size -= 8 + ch_bytes;
 183         }
 184         if (put_user(count, tlv + 1))
 185                 return -EFAULT;
 186         return 0;
 187 }
 188 
 189 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
 190                              struct snd_ctl_elem_value *ucontrol)
 191 {
 192         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 193         struct snd_usb_substream *subs = info->private_data;
 194         struct snd_pcm_chmap_elem *chmap = NULL;
 195         int i;
 196 
 197         memset(ucontrol->value.integer.value, 0,
 198                sizeof(ucontrol->value.integer.value));
 199         if (subs->cur_audiofmt)
 200                 chmap = subs->cur_audiofmt->chmap;
 201         if (chmap) {
 202                 for (i = 0; i < chmap->channels; i++)
 203                         ucontrol->value.integer.value[i] = chmap->map[i];
 204         }
 205         return 0;
 206 }
 207 
 208 /* create a chmap kctl assigned to the given USB substream */
 209 static int add_chmap(struct snd_pcm *pcm, int stream,
 210                      struct snd_usb_substream *subs)
 211 {
 212         struct audioformat *fp;
 213         struct snd_pcm_chmap *chmap;
 214         struct snd_kcontrol *kctl;
 215         int err;
 216 
 217         list_for_each_entry(fp, &subs->fmt_list, list)
 218                 if (fp->chmap)
 219                         goto ok;
 220         /* no chmap is found */
 221         return 0;
 222 
 223  ok:
 224         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
 225         if (err < 0)
 226                 return err;
 227 
 228         /* override handlers */
 229         chmap->private_data = subs;
 230         kctl = chmap->kctl;
 231         kctl->info = usb_chmap_ctl_info;
 232         kctl->get = usb_chmap_ctl_get;
 233         kctl->tlv.c = usb_chmap_ctl_tlv;
 234 
 235         return 0;
 236 }
 237 
 238 /* convert from USB ChannelConfig bits to ALSA chmap element */
 239 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 240                                                 int protocol)
 241 {
 242         static unsigned int uac1_maps[] = {
 243                 SNDRV_CHMAP_FL,         /* left front */
 244                 SNDRV_CHMAP_FR,         /* right front */
 245                 SNDRV_CHMAP_FC,         /* center front */
 246                 SNDRV_CHMAP_LFE,        /* LFE */
 247                 SNDRV_CHMAP_SL,         /* left surround */
 248                 SNDRV_CHMAP_SR,         /* right surround */
 249                 SNDRV_CHMAP_FLC,        /* left of center */
 250                 SNDRV_CHMAP_FRC,        /* right of center */
 251                 SNDRV_CHMAP_RC,         /* surround */
 252                 SNDRV_CHMAP_SL,         /* side left */
 253                 SNDRV_CHMAP_SR,         /* side right */
 254                 SNDRV_CHMAP_TC,         /* top */
 255                 0 /* terminator */
 256         };
 257         static unsigned int uac2_maps[] = {
 258                 SNDRV_CHMAP_FL,         /* front left */
 259                 SNDRV_CHMAP_FR,         /* front right */
 260                 SNDRV_CHMAP_FC,         /* front center */
 261                 SNDRV_CHMAP_LFE,        /* LFE */
 262                 SNDRV_CHMAP_RL,         /* back left */
 263                 SNDRV_CHMAP_RR,         /* back right */
 264                 SNDRV_CHMAP_FLC,        /* front left of center */
 265                 SNDRV_CHMAP_FRC,        /* front right of center */
 266                 SNDRV_CHMAP_RC,         /* back center */
 267                 SNDRV_CHMAP_SL,         /* side left */
 268                 SNDRV_CHMAP_SR,         /* side right */
 269                 SNDRV_CHMAP_TC,         /* top center */
 270                 SNDRV_CHMAP_TFL,        /* top front left */
 271                 SNDRV_CHMAP_TFC,        /* top front center */
 272                 SNDRV_CHMAP_TFR,        /* top front right */
 273                 SNDRV_CHMAP_TRL,        /* top back left */
 274                 SNDRV_CHMAP_TRC,        /* top back center */
 275                 SNDRV_CHMAP_TRR,        /* top back right */
 276                 SNDRV_CHMAP_TFLC,       /* top front left of center */
 277                 SNDRV_CHMAP_TFRC,       /* top front right of center */
 278                 SNDRV_CHMAP_LLFE,       /* left LFE */
 279                 SNDRV_CHMAP_RLFE,       /* right LFE */
 280                 SNDRV_CHMAP_TSL,        /* top side left */
 281                 SNDRV_CHMAP_TSR,        /* top side right */
 282                 SNDRV_CHMAP_BC,         /* bottom center */
 283                 SNDRV_CHMAP_RLC,        /* back left of center */
 284                 SNDRV_CHMAP_RRC,        /* back right of center */
 285                 0 /* terminator */
 286         };
 287         struct snd_pcm_chmap_elem *chmap;
 288         const unsigned int *maps;
 289         int c;
 290 
 291         if (channels > ARRAY_SIZE(chmap->map))
 292                 return NULL;
 293 
 294         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 295         if (!chmap)
 296                 return NULL;
 297 
 298         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
 299         chmap->channels = channels;
 300         c = 0;
 301 
 302         if (bits) {
 303                 for (; bits && *maps; maps++, bits >>= 1)
 304                         if (bits & 1)
 305                                 chmap->map[c++] = *maps;
 306         } else {
 307                 /* If we're missing wChannelConfig, then guess something
 308                     to make sure the channel map is not skipped entirely */
 309                 if (channels == 1)
 310                         chmap->map[c++] = SNDRV_CHMAP_MONO;
 311                 else
 312                         for (; c < channels && *maps; maps++)
 313                                 chmap->map[c++] = *maps;
 314         }
 315 
 316         for (; c < channels; c++)
 317                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 318 
 319         return chmap;
 320 }
 321 
 322 /* UAC3 device stores channels information in Cluster Descriptors */
 323 static struct
 324 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
 325                                                                 *cluster)
 326 {
 327         unsigned int channels = cluster->bNrChannels;
 328         struct snd_pcm_chmap_elem *chmap;
 329         void *p = cluster;
 330         int len, c;
 331 
 332         if (channels > ARRAY_SIZE(chmap->map))
 333                 return NULL;
 334 
 335         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 336         if (!chmap)
 337                 return NULL;
 338 
 339         len = le16_to_cpu(cluster->wLength);
 340         c = 0;
 341         p += sizeof(struct uac3_cluster_header_descriptor);
 342 
 343         while (((p - (void *)cluster) < len) && (c < channels)) {
 344                 struct uac3_cluster_segment_descriptor *cs_desc = p;
 345                 u16 cs_len;
 346                 u8 cs_type;
 347 
 348                 cs_len = le16_to_cpu(cs_desc->wLength);
 349                 cs_type = cs_desc->bSegmentType;
 350 
 351                 if (cs_type == UAC3_CHANNEL_INFORMATION) {
 352                         struct uac3_cluster_information_segment_descriptor *is = p;
 353                         unsigned char map;
 354 
 355                         /*
 356                          * TODO: this conversion is not complete, update it
 357                          * after adding UAC3 values to asound.h
 358                          */
 359                         switch (is->bChRelationship) {
 360                         case UAC3_CH_MONO:
 361                                 map = SNDRV_CHMAP_MONO;
 362                                 break;
 363                         case UAC3_CH_LEFT:
 364                         case UAC3_CH_FRONT_LEFT:
 365                         case UAC3_CH_HEADPHONE_LEFT:
 366                                 map = SNDRV_CHMAP_FL;
 367                                 break;
 368                         case UAC3_CH_RIGHT:
 369                         case UAC3_CH_FRONT_RIGHT:
 370                         case UAC3_CH_HEADPHONE_RIGHT:
 371                                 map = SNDRV_CHMAP_FR;
 372                                 break;
 373                         case UAC3_CH_FRONT_CENTER:
 374                                 map = SNDRV_CHMAP_FC;
 375                                 break;
 376                         case UAC3_CH_FRONT_LEFT_OF_CENTER:
 377                                 map = SNDRV_CHMAP_FLC;
 378                                 break;
 379                         case UAC3_CH_FRONT_RIGHT_OF_CENTER:
 380                                 map = SNDRV_CHMAP_FRC;
 381                                 break;
 382                         case UAC3_CH_SIDE_LEFT:
 383                                 map = SNDRV_CHMAP_SL;
 384                                 break;
 385                         case UAC3_CH_SIDE_RIGHT:
 386                                 map = SNDRV_CHMAP_SR;
 387                                 break;
 388                         case UAC3_CH_BACK_LEFT:
 389                                 map = SNDRV_CHMAP_RL;
 390                                 break;
 391                         case UAC3_CH_BACK_RIGHT:
 392                                 map = SNDRV_CHMAP_RR;
 393                                 break;
 394                         case UAC3_CH_BACK_CENTER:
 395                                 map = SNDRV_CHMAP_RC;
 396                                 break;
 397                         case UAC3_CH_BACK_LEFT_OF_CENTER:
 398                                 map = SNDRV_CHMAP_RLC;
 399                                 break;
 400                         case UAC3_CH_BACK_RIGHT_OF_CENTER:
 401                                 map = SNDRV_CHMAP_RRC;
 402                                 break;
 403                         case UAC3_CH_TOP_CENTER:
 404                                 map = SNDRV_CHMAP_TC;
 405                                 break;
 406                         case UAC3_CH_TOP_FRONT_LEFT:
 407                                 map = SNDRV_CHMAP_TFL;
 408                                 break;
 409                         case UAC3_CH_TOP_FRONT_RIGHT:
 410                                 map = SNDRV_CHMAP_TFR;
 411                                 break;
 412                         case UAC3_CH_TOP_FRONT_CENTER:
 413                                 map = SNDRV_CHMAP_TFC;
 414                                 break;
 415                         case UAC3_CH_TOP_FRONT_LOC:
 416                                 map = SNDRV_CHMAP_TFLC;
 417                                 break;
 418                         case UAC3_CH_TOP_FRONT_ROC:
 419                                 map = SNDRV_CHMAP_TFRC;
 420                                 break;
 421                         case UAC3_CH_TOP_SIDE_LEFT:
 422                                 map = SNDRV_CHMAP_TSL;
 423                                 break;
 424                         case UAC3_CH_TOP_SIDE_RIGHT:
 425                                 map = SNDRV_CHMAP_TSR;
 426                                 break;
 427                         case UAC3_CH_TOP_BACK_LEFT:
 428                                 map = SNDRV_CHMAP_TRL;
 429                                 break;
 430                         case UAC3_CH_TOP_BACK_RIGHT:
 431                                 map = SNDRV_CHMAP_TRR;
 432                                 break;
 433                         case UAC3_CH_TOP_BACK_CENTER:
 434                                 map = SNDRV_CHMAP_TRC;
 435                                 break;
 436                         case UAC3_CH_BOTTOM_CENTER:
 437                                 map = SNDRV_CHMAP_BC;
 438                                 break;
 439                         case UAC3_CH_LOW_FREQUENCY_EFFECTS:
 440                                 map = SNDRV_CHMAP_LFE;
 441                                 break;
 442                         case UAC3_CH_LFE_LEFT:
 443                                 map = SNDRV_CHMAP_LLFE;
 444                                 break;
 445                         case UAC3_CH_LFE_RIGHT:
 446                                 map = SNDRV_CHMAP_RLFE;
 447                                 break;
 448                         case UAC3_CH_RELATIONSHIP_UNDEFINED:
 449                         default:
 450                                 map = SNDRV_CHMAP_UNKNOWN;
 451                                 break;
 452                         }
 453                         chmap->map[c++] = map;
 454                 }
 455                 p += cs_len;
 456         }
 457 
 458         if (channels < c)
 459                 pr_err("%s: channel number mismatch\n", __func__);
 460 
 461         chmap->channels = channels;
 462 
 463         for (; c < channels; c++)
 464                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 465 
 466         return chmap;
 467 }
 468 
 469 /*
 470  * add this endpoint to the chip instance.
 471  * if a stream with the same endpoint already exists, append to it.
 472  * if not, create a new pcm stream. note, fp is added to the substream
 473  * fmt_list and will be freed on the chip instance release. do not free
 474  * fp or do remove it from the substream fmt_list to avoid double-free.
 475  */
 476 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 477                                       int stream,
 478                                       struct audioformat *fp,
 479                                       struct snd_usb_power_domain *pd)
 480 
 481 {
 482         struct snd_usb_stream *as;
 483         struct snd_usb_substream *subs;
 484         struct snd_pcm *pcm;
 485         int err;
 486 
 487         list_for_each_entry(as, &chip->pcm_list, list) {
 488                 if (as->fmt_type != fp->fmt_type)
 489                         continue;
 490                 subs = &as->substream[stream];
 491                 if (subs->ep_num == fp->endpoint) {
 492                         list_add_tail(&fp->list, &subs->fmt_list);
 493                         subs->num_formats++;
 494                         subs->formats |= fp->formats;
 495                         return 0;
 496                 }
 497         }
 498         /* look for an empty stream */
 499         list_for_each_entry(as, &chip->pcm_list, list) {
 500                 if (as->fmt_type != fp->fmt_type)
 501                         continue;
 502                 subs = &as->substream[stream];
 503                 if (subs->ep_num)
 504                         continue;
 505                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 506                 if (err < 0)
 507                         return err;
 508                 snd_usb_init_substream(as, stream, fp, pd);
 509                 return add_chmap(as->pcm, stream, subs);
 510         }
 511 
 512         /* create a new pcm */
 513         as = kzalloc(sizeof(*as), GFP_KERNEL);
 514         if (!as)
 515                 return -ENOMEM;
 516         as->pcm_index = chip->pcm_devs;
 517         as->chip = chip;
 518         as->fmt_type = fp->fmt_type;
 519         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 520                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 521                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 522                           &pcm);
 523         if (err < 0) {
 524                 kfree(as);
 525                 return err;
 526         }
 527         as->pcm = pcm;
 528         pcm->private_data = as;
 529         pcm->private_free = snd_usb_audio_pcm_free;
 530         pcm->info_flags = 0;
 531         if (chip->pcm_devs > 0)
 532                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 533         else
 534                 strcpy(pcm->name, "USB Audio");
 535 
 536         snd_usb_init_substream(as, stream, fp, pd);
 537 
 538         /*
 539          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
 540          * fix to swap capture stream order in conf/cards/USB-audio.conf
 541          */
 542         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 543                 list_add(&as->list, &chip->pcm_list);
 544         else
 545                 list_add_tail(&as->list, &chip->pcm_list);
 546 
 547         chip->pcm_devs++;
 548 
 549         snd_usb_proc_pcm_format_add(as);
 550 
 551         return add_chmap(pcm, stream, &as->substream[stream]);
 552 }
 553 
 554 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 555                              int stream,
 556                              struct audioformat *fp)
 557 {
 558         return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
 559 }
 560 
 561 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
 562                                        int stream,
 563                                        struct audioformat *fp,
 564                                        struct snd_usb_power_domain *pd)
 565 {
 566         return __snd_usb_add_audio_stream(chip, stream, fp, pd);
 567 }
 568 
 569 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 570                                          struct usb_host_interface *alts,
 571                                          int protocol, int iface_no)
 572 {
 573         /* parsed with a v1 header here. that's ok as we only look at the
 574          * header first which is the same for both versions */
 575         struct uac_iso_endpoint_descriptor *csep;
 576         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 577         int attributes = 0;
 578 
 579         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 580 
 581         /* Creamware Noah has this descriptor after the 2nd endpoint */
 582         if (!csep && altsd->bNumEndpoints >= 2)
 583                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 584 
 585         /*
 586          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
 587          * bytes after the first endpoint, go search the entire interface.
 588          * Some devices have it directly *before* the standard endpoint.
 589          */
 590         if (!csep)
 591                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
 592 
 593         if (!csep || csep->bLength < 7 ||
 594             csep->bDescriptorSubtype != UAC_EP_GENERAL)
 595                 goto error;
 596 
 597         if (protocol == UAC_VERSION_1) {
 598                 attributes = csep->bmAttributes;
 599         } else if (protocol == UAC_VERSION_2) {
 600                 struct uac2_iso_endpoint_descriptor *csep2 =
 601                         (struct uac2_iso_endpoint_descriptor *) csep;
 602 
 603                 if (csep2->bLength < sizeof(*csep2))
 604                         goto error;
 605                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 606 
 607                 /* emulate the endpoint attributes of a v1 device */
 608                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 609                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 610         } else { /* UAC_VERSION_3 */
 611                 struct uac3_iso_endpoint_descriptor *csep3 =
 612                         (struct uac3_iso_endpoint_descriptor *) csep;
 613 
 614                 if (csep3->bLength < sizeof(*csep3))
 615                         goto error;
 616                 /* emulate the endpoint attributes of a v1 device */
 617                 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
 618                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 619         }
 620 
 621         return attributes;
 622 
 623  error:
 624         usb_audio_warn(chip,
 625                        "%u:%d : no or invalid class specific endpoint descriptor\n",
 626                        iface_no, altsd->bAlternateSetting);
 627         return 0;
 628 }
 629 
 630 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
 631  * terminal id
 632  */
 633 static void *
 634 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 635                                        int terminal_id, int protocol)
 636 {
 637         struct uac2_input_terminal_descriptor *term = NULL;
 638 
 639         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 640                                                ctrl_iface->extralen,
 641                                                term, UAC_INPUT_TERMINAL))) {
 642                 if (!snd_usb_validate_audio_desc(term, protocol))
 643                         continue;
 644                 if (term->bTerminalID == terminal_id)
 645                         return term;
 646         }
 647 
 648         return NULL;
 649 }
 650 
 651 static void *
 652 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 653                                         int terminal_id, int protocol)
 654 {
 655         /* OK to use with both UAC2 and UAC3 */
 656         struct uac2_output_terminal_descriptor *term = NULL;
 657 
 658         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 659                                                ctrl_iface->extralen,
 660                                                term, UAC_OUTPUT_TERMINAL))) {
 661                 if (!snd_usb_validate_audio_desc(term, protocol))
 662                         continue;
 663                 if (term->bTerminalID == terminal_id)
 664                         return term;
 665         }
 666 
 667         return NULL;
 668 }
 669 
 670 static struct audioformat *
 671 audio_format_alloc_init(struct snd_usb_audio *chip,
 672                        struct usb_host_interface *alts,
 673                        int protocol, int iface_no, int altset_idx,
 674                        int altno, int num_channels, int clock)
 675 {
 676         struct audioformat *fp;
 677 
 678         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 679         if (!fp)
 680                 return NULL;
 681 
 682         fp->iface = iface_no;
 683         fp->altsetting = altno;
 684         fp->altset_idx = altset_idx;
 685         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 686         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 687         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 688         fp->protocol = protocol;
 689         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 690         fp->channels = num_channels;
 691         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
 692                 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 693                                 * (fp->maxpacksize & 0x7ff);
 694         fp->clock = clock;
 695         INIT_LIST_HEAD(&fp->list);
 696 
 697         return fp;
 698 }
 699 
 700 static struct audioformat *
 701 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
 702                               struct usb_host_interface *alts,
 703                               int protocol, int iface_no, int altset_idx,
 704                               int altno, int stream, int bm_quirk)
 705 {
 706         struct usb_device *dev = chip->dev;
 707         struct uac_format_type_i_continuous_descriptor *fmt;
 708         unsigned int num_channels = 0, chconfig = 0;
 709         struct audioformat *fp;
 710         int clock = 0;
 711         u64 format;
 712 
 713         /* get audio formats */
 714         if (protocol == UAC_VERSION_1) {
 715                 struct uac1_as_header_descriptor *as =
 716                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 717                                                 NULL, UAC_AS_GENERAL);
 718                 struct uac_input_terminal_descriptor *iterm;
 719 
 720                 if (!as) {
 721                         dev_err(&dev->dev,
 722                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 723                                 iface_no, altno);
 724                         return NULL;
 725                 }
 726 
 727                 if (as->bLength < sizeof(*as)) {
 728                         dev_err(&dev->dev,
 729                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 730                                 iface_no, altno);
 731                         return NULL;
 732                 }
 733 
 734                 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 735 
 736                 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 737                                                                as->bTerminalLink,
 738                                                                protocol);
 739                 if (iterm) {
 740                         num_channels = iterm->bNrChannels;
 741                         chconfig = le16_to_cpu(iterm->wChannelConfig);
 742                 }
 743         } else { /* UAC_VERSION_2 */
 744                 struct uac2_input_terminal_descriptor *input_term;
 745                 struct uac2_output_terminal_descriptor *output_term;
 746                 struct uac2_as_header_descriptor *as =
 747                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 748                                                 NULL, UAC_AS_GENERAL);
 749 
 750                 if (!as) {
 751                         dev_err(&dev->dev,
 752                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 753                                 iface_no, altno);
 754                         return NULL;
 755                 }
 756 
 757                 if (as->bLength < sizeof(*as)) {
 758                         dev_err(&dev->dev,
 759                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 760                                 iface_no, altno);
 761                         return NULL;
 762                 }
 763 
 764                 num_channels = as->bNrChannels;
 765                 format = le32_to_cpu(as->bmFormats);
 766                 chconfig = le32_to_cpu(as->bmChannelConfig);
 767 
 768                 /*
 769                  * lookup the terminal associated to this interface
 770                  * to extract the clock
 771                  */
 772                 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 773                                                                     as->bTerminalLink,
 774                                                                     protocol);
 775                 if (input_term) {
 776                         clock = input_term->bCSourceID;
 777                         if (!chconfig && (num_channels == input_term->bNrChannels))
 778                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
 779                         goto found_clock;
 780                 }
 781 
 782                 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
 783                                                                       as->bTerminalLink,
 784                                                                       protocol);
 785                 if (output_term) {
 786                         clock = output_term->bCSourceID;
 787                         goto found_clock;
 788                 }
 789 
 790                 dev_err(&dev->dev,
 791                         "%u:%d : bogus bTerminalLink %d\n",
 792                         iface_no, altno, as->bTerminalLink);
 793                 return NULL;
 794         }
 795 
 796 found_clock:
 797         /* get format type */
 798         fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 799                                       NULL, UAC_FORMAT_TYPE);
 800         if (!fmt) {
 801                 dev_err(&dev->dev,
 802                         "%u:%d : no UAC_FORMAT_TYPE desc\n",
 803                         iface_no, altno);
 804                 return NULL;
 805         }
 806         if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
 807                         || ((protocol == UAC_VERSION_2) &&
 808                                         (fmt->bLength < 6))) {
 809                 dev_err(&dev->dev,
 810                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 811                         iface_no, altno);
 812                 return NULL;
 813         }
 814 
 815         /*
 816          * Blue Microphones workaround: The last altsetting is
 817          * identical with the previous one, except for a larger
 818          * packet size, but is actually a mislabeled two-channel
 819          * setting; ignore it.
 820          *
 821          * Part 2: analyze quirk flag and format
 822          */
 823         if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
 824                 return NULL;
 825 
 826         fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
 827                                      altset_idx, altno, num_channels, clock);
 828         if (!fp)
 829                 return ERR_PTR(-ENOMEM);
 830 
 831         fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
 832                                                        iface_no);
 833 
 834         /* some quirks for attributes here */
 835         snd_usb_audioformat_attributes_quirk(chip, fp, stream);
 836 
 837         /* ok, let's parse further... */
 838         if (snd_usb_parse_audio_format(chip, fp, format,
 839                                         fmt, stream) < 0) {
 840                 audioformat_free(fp);
 841                 return NULL;
 842         }
 843 
 844         /* Create chmap */
 845         if (fp->channels != num_channels)
 846                 chconfig = 0;
 847 
 848         fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
 849 
 850         return fp;
 851 }
 852 
 853 static struct audioformat *
 854 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
 855                              struct usb_host_interface *alts,
 856                              struct snd_usb_power_domain **pd_out,
 857                              int iface_no, int altset_idx,
 858                              int altno, int stream)
 859 {
 860         struct usb_device *dev = chip->dev;
 861         struct uac3_input_terminal_descriptor *input_term;
 862         struct uac3_output_terminal_descriptor *output_term;
 863         struct uac3_cluster_header_descriptor *cluster;
 864         struct uac3_as_header_descriptor *as = NULL;
 865         struct uac3_hc_descriptor_header hc_header;
 866         struct snd_pcm_chmap_elem *chmap;
 867         struct snd_usb_power_domain *pd;
 868         unsigned char badd_profile;
 869         u64 badd_formats = 0;
 870         unsigned int num_channels;
 871         struct audioformat *fp;
 872         u16 cluster_id, wLength;
 873         int clock = 0;
 874         int err;
 875 
 876         badd_profile = chip->badd_profile;
 877 
 878         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
 879                 unsigned int maxpacksize =
 880                         le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 881 
 882                 switch (maxpacksize) {
 883                 default:
 884                         dev_err(&dev->dev,
 885                                 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
 886                                 iface_no, altno);
 887                         return NULL;
 888                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
 889                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
 890                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 891                         num_channels = 1;
 892                         break;
 893                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
 894                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
 895                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 896                         num_channels = 1;
 897                         break;
 898                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
 899                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
 900                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 901                         num_channels = 2;
 902                         break;
 903                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
 904                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
 905                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 906                         num_channels = 2;
 907                         break;
 908                 }
 909 
 910                 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 911                 if (!chmap)
 912                         return ERR_PTR(-ENOMEM);
 913 
 914                 if (num_channels == 1) {
 915                         chmap->map[0] = SNDRV_CHMAP_MONO;
 916                 } else {
 917                         chmap->map[0] = SNDRV_CHMAP_FL;
 918                         chmap->map[1] = SNDRV_CHMAP_FR;
 919                 }
 920 
 921                 chmap->channels = num_channels;
 922                 clock = UAC3_BADD_CS_ID9;
 923                 goto found_clock;
 924         }
 925 
 926         as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 927                                      NULL, UAC_AS_GENERAL);
 928         if (!as) {
 929                 dev_err(&dev->dev,
 930                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 931                         iface_no, altno);
 932                 return NULL;
 933         }
 934 
 935         if (as->bLength < sizeof(*as)) {
 936                 dev_err(&dev->dev,
 937                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
 938                         iface_no, altno);
 939                 return NULL;
 940         }
 941 
 942         cluster_id = le16_to_cpu(as->wClusterDescrID);
 943         if (!cluster_id) {
 944                 dev_err(&dev->dev,
 945                         "%u:%d : no cluster descriptor\n",
 946                         iface_no, altno);
 947                 return NULL;
 948         }
 949 
 950         /*
 951          * Get number of channels and channel map through
 952          * High Capability Cluster Descriptor
 953          *
 954          * First step: get High Capability header and
 955          * read size of Cluster Descriptor
 956          */
 957         err = snd_usb_ctl_msg(chip->dev,
 958                         usb_rcvctrlpipe(chip->dev, 0),
 959                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 960                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 961                         cluster_id,
 962                         snd_usb_ctrl_intf(chip),
 963                         &hc_header, sizeof(hc_header));
 964         if (err < 0)
 965                 return ERR_PTR(err);
 966         else if (err != sizeof(hc_header)) {
 967                 dev_err(&dev->dev,
 968                         "%u:%d : can't get High Capability descriptor\n",
 969                         iface_no, altno);
 970                 return ERR_PTR(-EIO);
 971         }
 972 
 973         /*
 974          * Second step: allocate needed amount of memory
 975          * and request Cluster Descriptor
 976          */
 977         wLength = le16_to_cpu(hc_header.wLength);
 978         cluster = kzalloc(wLength, GFP_KERNEL);
 979         if (!cluster)
 980                 return ERR_PTR(-ENOMEM);
 981         err = snd_usb_ctl_msg(chip->dev,
 982                         usb_rcvctrlpipe(chip->dev, 0),
 983                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 984                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 985                         cluster_id,
 986                         snd_usb_ctrl_intf(chip),
 987                         cluster, wLength);
 988         if (err < 0) {
 989                 kfree(cluster);
 990                 return ERR_PTR(err);
 991         } else if (err != wLength) {
 992                 dev_err(&dev->dev,
 993                         "%u:%d : can't get Cluster Descriptor\n",
 994                         iface_no, altno);
 995                 kfree(cluster);
 996                 return ERR_PTR(-EIO);
 997         }
 998 
 999         num_channels = cluster->bNrChannels;
1000         chmap = convert_chmap_v3(cluster);
1001         kfree(cluster);
1002 
1003         /*
1004          * lookup the terminal associated to this interface
1005          * to extract the clock
1006          */
1007         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1008                                                             as->bTerminalLink,
1009                                                             UAC_VERSION_3);
1010         if (input_term) {
1011                 clock = input_term->bCSourceID;
1012                 goto found_clock;
1013         }
1014 
1015         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1016                                                               as->bTerminalLink,
1017                                                               UAC_VERSION_3);
1018         if (output_term) {
1019                 clock = output_term->bCSourceID;
1020                 goto found_clock;
1021         }
1022 
1023         dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1024                         iface_no, altno, as->bTerminalLink);
1025         kfree(chmap);
1026         return NULL;
1027 
1028 found_clock:
1029         fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1030                                      altset_idx, altno, num_channels, clock);
1031         if (!fp) {
1032                 kfree(chmap);
1033                 return ERR_PTR(-ENOMEM);
1034         }
1035 
1036         fp->chmap = chmap;
1037 
1038         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1039                 fp->attributes = 0; /* No attributes */
1040 
1041                 fp->fmt_type = UAC_FORMAT_TYPE_I;
1042                 fp->formats = badd_formats;
1043 
1044                 fp->nr_rates = 0;       /* SNDRV_PCM_RATE_CONTINUOUS */
1045                 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1046                 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1047                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1048 
1049                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1050                 if (!pd) {
1051                         audioformat_free(fp);
1052                         return NULL;
1053                 }
1054                 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1055                                         UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1056                 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1057                 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1058 
1059         } else {
1060                 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1061                                                                UAC_VERSION_3,
1062                                                                iface_no);
1063 
1064                 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1065                                                as->bTerminalLink);
1066 
1067                 /* ok, let's parse further... */
1068                 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1069                         kfree(pd);
1070                         audioformat_free(fp);
1071                         return NULL;
1072                 }
1073         }
1074 
1075         if (pd)
1076                 *pd_out = pd;
1077 
1078         return fp;
1079 }
1080 
1081 static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1082                                            int iface_no,
1083                                            bool *has_non_pcm, bool non_pcm)
1084 {
1085         struct usb_device *dev;
1086         struct usb_interface *iface;
1087         struct usb_host_interface *alts;
1088         struct usb_interface_descriptor *altsd;
1089         int i, altno, err, stream;
1090         struct audioformat *fp = NULL;
1091         struct snd_usb_power_domain *pd = NULL;
1092         int num, protocol;
1093 
1094         dev = chip->dev;
1095 
1096         /* parse the interface's altsettings */
1097         iface = usb_ifnum_to_if(dev, iface_no);
1098 
1099         num = iface->num_altsetting;
1100 
1101         /*
1102          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1103          * one misses syncpipe, and does not produce any sound.
1104          */
1105         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1106                 num = 4;
1107 
1108         for (i = 0; i < num; i++) {
1109                 alts = &iface->altsetting[i];
1110                 altsd = get_iface_desc(alts);
1111                 protocol = altsd->bInterfaceProtocol;
1112                 /* skip invalid one */
1113                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1114                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1115                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1116                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1117                     altsd->bNumEndpoints < 1 ||
1118                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1119                         continue;
1120                 /* must be isochronous */
1121                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1122                     USB_ENDPOINT_XFER_ISOC)
1123                         continue;
1124                 /* check direction */
1125                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1126                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1127                 altno = altsd->bAlternateSetting;
1128 
1129                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1130                         continue;
1131 
1132                 /*
1133                  * Roland audio streaming interfaces are marked with protocols
1134                  * 0/1/2, but are UAC 1 compatible.
1135                  */
1136                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1137                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1138                     protocol <= 2)
1139                         protocol = UAC_VERSION_1;
1140 
1141                 switch (protocol) {
1142                 default:
1143                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1144                                 iface_no, altno, protocol);
1145                         protocol = UAC_VERSION_1;
1146                         /* fall through */
1147                 case UAC_VERSION_1:
1148                         /* fall through */
1149                 case UAC_VERSION_2: {
1150                         int bm_quirk = 0;
1151 
1152                         /*
1153                          * Blue Microphones workaround: The last altsetting is
1154                          * identical with the previous one, except for a larger
1155                          * packet size, but is actually a mislabeled two-channel
1156                          * setting; ignore it.
1157                          *
1158                          * Part 1: prepare quirk flag
1159                          */
1160                         if (altno == 2 && num == 3 &&
1161                             fp && fp->altsetting == 1 && fp->channels == 1 &&
1162                             fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1163                             protocol == UAC_VERSION_1 &&
1164                             le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1165                                                         fp->maxpacksize * 2)
1166                                 bm_quirk = 1;
1167 
1168                         fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1169                                                            iface_no, i, altno,
1170                                                            stream, bm_quirk);
1171                         break;
1172                 }
1173                 case UAC_VERSION_3:
1174                         fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1175                                                 iface_no, i, altno, stream);
1176                         break;
1177                 }
1178 
1179                 if (!fp)
1180                         continue;
1181                 else if (IS_ERR(fp))
1182                         return PTR_ERR(fp);
1183 
1184                 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1185                         *has_non_pcm = true;
1186                 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1187                         audioformat_free(fp);
1188                         kfree(pd);
1189                         fp = NULL;
1190                         pd = NULL;
1191                         continue;
1192                 }
1193 
1194                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1195                 if (protocol == UAC_VERSION_3)
1196                         err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1197                 else
1198                         err = snd_usb_add_audio_stream(chip, stream, fp);
1199 
1200                 if (err < 0) {
1201                         audioformat_free(fp);
1202                         kfree(pd);
1203                         return err;
1204                 }
1205                 /* try to set the interface... */
1206                 usb_set_interface(chip->dev, iface_no, altno);
1207                 snd_usb_init_pitch(chip, iface_no, alts, fp);
1208                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1209         }
1210         return 0;
1211 }
1212 
1213 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1214 {
1215         int err;
1216         bool has_non_pcm = false;
1217 
1218         /* parse PCM formats */
1219         err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1220         if (err < 0)
1221                 return err;
1222 
1223         if (has_non_pcm) {
1224                 /* parse non-PCM formats */
1225                 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1226                 if (err < 0)
1227                         return err;
1228         }
1229 
1230         return 0;
1231 }
1232
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root/sound/usb/stream.c

DEFINITIONS
