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TOMOYO Linux Cross Reference
Linux/sound/usb/stream.c

Version: ~ [ linux-5.7 ] ~ [ linux-5.6.15 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.43 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.125 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.182 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.225 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.225 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.84 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/usb/audio-v3.h>
 24 
 25 #include <sound/core.h>
 26 #include <sound/pcm.h>
 27 #include <sound/control.h>
 28 #include <sound/tlv.h>
 29 
 30 #include "usbaudio.h"
 31 #include "card.h"
 32 #include "proc.h"
 33 #include "quirks.h"
 34 #include "endpoint.h"
 35 #include "pcm.h"
 36 #include "helper.h"
 37 #include "format.h"
 38 #include "clock.h"
 39 #include "stream.h"
 40 #include "power.h"
 41 
 42 /*
 43  * free a substream
 44  */
 45 static void free_substream(struct snd_usb_substream *subs)
 46 {
 47         struct audioformat *fp, *n;
 48 
 49         if (!subs->num_formats)
 50                 return; /* not initialized */
 51         list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
 52                 kfree(fp->rate_table);
 53                 kfree(fp->chmap);
 54                 kfree(fp);
 55         }
 56         kfree(subs->rate_list.list);
 57         kfree(subs->str_pd);
 58 }
 59 
 60 
 61 /*
 62  * free a usb stream instance
 63  */
 64 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
 65 {
 66         free_substream(&stream->substream[0]);
 67         free_substream(&stream->substream[1]);
 68         list_del(&stream->list);
 69         kfree(stream);
 70 }
 71 
 72 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
 73 {
 74         struct snd_usb_stream *stream = pcm->private_data;
 75         if (stream) {
 76                 stream->pcm = NULL;
 77                 snd_usb_audio_stream_free(stream);
 78         }
 79 }
 80 
 81 /*
 82  * initialize the substream instance.
 83  */
 84 
 85 static void snd_usb_init_substream(struct snd_usb_stream *as,
 86                                    int stream,
 87                                    struct audioformat *fp,
 88                                    struct snd_usb_power_domain *pd)
 89 {
 90         struct snd_usb_substream *subs = &as->substream[stream];
 91 
 92         INIT_LIST_HEAD(&subs->fmt_list);
 93         spin_lock_init(&subs->lock);
 94 
 95         subs->stream = as;
 96         subs->direction = stream;
 97         subs->dev = as->chip->dev;
 98         subs->txfr_quirk = as->chip->txfr_quirk;
 99         subs->tx_length_quirk = as->chip->tx_length_quirk;
100         subs->speed = snd_usb_get_speed(subs->dev);
101         subs->pkt_offset_adj = 0;
102 
103         snd_usb_set_pcm_ops(as->pcm, stream);
104 
105         list_add_tail(&fp->list, &subs->fmt_list);
106         subs->formats |= fp->formats;
107         subs->num_formats++;
108         subs->fmt_type = fp->fmt_type;
109         subs->ep_num = fp->endpoint;
110         if (fp->channels > subs->channels_max)
111                 subs->channels_max = fp->channels;
112 
113         if (pd) {
114                 subs->str_pd = pd;
115                 /* Initialize Power Domain to idle status D1 */
116                 snd_usb_power_domain_set(subs->stream->chip, pd,
117                                          UAC3_PD_STATE_D1);
118         }
119 
120         snd_usb_preallocate_buffer(subs);
121 }
122 
123 /* kctl callbacks for usb-audio channel maps */
124 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
125                               struct snd_ctl_elem_info *uinfo)
126 {
127         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
128         struct snd_usb_substream *subs = info->private_data;
129 
130         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
131         uinfo->count = subs->channels_max;
132         uinfo->value.integer.min = 0;
133         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
134         return 0;
135 }
136 
137 /* check whether a duplicated entry exists in the audiofmt list */
138 static bool have_dup_chmap(struct snd_usb_substream *subs,
139                            struct audioformat *fp)
140 {
141         struct audioformat *prev = fp;
142 
143         list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
144                 if (prev->chmap &&
145                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
146                         return true;
147         }
148         return false;
149 }
150 
151 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
152                              unsigned int size, unsigned int __user *tlv)
153 {
154         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
155         struct snd_usb_substream *subs = info->private_data;
156         struct audioformat *fp;
157         unsigned int __user *dst;
158         int count = 0;
159 
160         if (size < 8)
161                 return -ENOMEM;
162         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
163                 return -EFAULT;
164         size -= 8;
165         dst = tlv + 2;
166         list_for_each_entry(fp, &subs->fmt_list, list) {
167                 int i, ch_bytes;
168 
169                 if (!fp->chmap)
170                         continue;
171                 if (have_dup_chmap(subs, fp))
172                         continue;
173                 /* copy the entry */
174                 ch_bytes = fp->chmap->channels * 4;
175                 if (size < 8 + ch_bytes)
176                         return -ENOMEM;
177                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
178                     put_user(ch_bytes, dst + 1))
179                         return -EFAULT;
180                 dst += 2;
181                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
182                         if (put_user(fp->chmap->map[i], dst))
183                                 return -EFAULT;
184                 }
185 
186                 count += 8 + ch_bytes;
187                 size -= 8 + ch_bytes;
188         }
189         if (put_user(count, tlv + 1))
190                 return -EFAULT;
191         return 0;
192 }
193 
194 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
195                              struct snd_ctl_elem_value *ucontrol)
196 {
197         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
198         struct snd_usb_substream *subs = info->private_data;
199         struct snd_pcm_chmap_elem *chmap = NULL;
200         int i;
201 
202         memset(ucontrol->value.integer.value, 0,
203                sizeof(ucontrol->value.integer.value));
204         if (subs->cur_audiofmt)
205                 chmap = subs->cur_audiofmt->chmap;
206         if (chmap) {
207                 for (i = 0; i < chmap->channels; i++)
208                         ucontrol->value.integer.value[i] = chmap->map[i];
209         }
210         return 0;
211 }
212 
213 /* create a chmap kctl assigned to the given USB substream */
214 static int add_chmap(struct snd_pcm *pcm, int stream,
215                      struct snd_usb_substream *subs)
216 {
217         struct audioformat *fp;
218         struct snd_pcm_chmap *chmap;
219         struct snd_kcontrol *kctl;
220         int err;
221 
222         list_for_each_entry(fp, &subs->fmt_list, list)
223                 if (fp->chmap)
224                         goto ok;
225         /* no chmap is found */
226         return 0;
227 
228  ok:
229         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
230         if (err < 0)
231                 return err;
232 
233         /* override handlers */
234         chmap->private_data = subs;
235         kctl = chmap->kctl;
236         kctl->info = usb_chmap_ctl_info;
237         kctl->get = usb_chmap_ctl_get;
238         kctl->tlv.c = usb_chmap_ctl_tlv;
239 
240         return 0;
241 }
242 
243 /* convert from USB ChannelConfig bits to ALSA chmap element */
244 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
245                                                 int protocol)
246 {
247         static unsigned int uac1_maps[] = {
248                 SNDRV_CHMAP_FL,         /* left front */
249                 SNDRV_CHMAP_FR,         /* right front */
250                 SNDRV_CHMAP_FC,         /* center front */
251                 SNDRV_CHMAP_LFE,        /* LFE */
252                 SNDRV_CHMAP_SL,         /* left surround */
253                 SNDRV_CHMAP_SR,         /* right surround */
254                 SNDRV_CHMAP_FLC,        /* left of center */
255                 SNDRV_CHMAP_FRC,        /* right of center */
256                 SNDRV_CHMAP_RC,         /* surround */
257                 SNDRV_CHMAP_SL,         /* side left */
258                 SNDRV_CHMAP_SR,         /* side right */
259                 SNDRV_CHMAP_TC,         /* top */
260                 0 /* terminator */
261         };
262         static unsigned int uac2_maps[] = {
263                 SNDRV_CHMAP_FL,         /* front left */
264                 SNDRV_CHMAP_FR,         /* front right */
265                 SNDRV_CHMAP_FC,         /* front center */
266                 SNDRV_CHMAP_LFE,        /* LFE */
267                 SNDRV_CHMAP_RL,         /* back left */
268                 SNDRV_CHMAP_RR,         /* back right */
269                 SNDRV_CHMAP_FLC,        /* front left of center */
270                 SNDRV_CHMAP_FRC,        /* front right of center */
271                 SNDRV_CHMAP_RC,         /* back center */
272                 SNDRV_CHMAP_SL,         /* side left */
273                 SNDRV_CHMAP_SR,         /* side right */
274                 SNDRV_CHMAP_TC,         /* top center */
275                 SNDRV_CHMAP_TFL,        /* top front left */
276                 SNDRV_CHMAP_TFC,        /* top front center */
277                 SNDRV_CHMAP_TFR,        /* top front right */
278                 SNDRV_CHMAP_TRL,        /* top back left */
279                 SNDRV_CHMAP_TRC,        /* top back center */
280                 SNDRV_CHMAP_TRR,        /* top back right */
281                 SNDRV_CHMAP_TFLC,       /* top front left of center */
282                 SNDRV_CHMAP_TFRC,       /* top front right of center */
283                 SNDRV_CHMAP_LLFE,       /* left LFE */
284                 SNDRV_CHMAP_RLFE,       /* right LFE */
285                 SNDRV_CHMAP_TSL,        /* top side left */
286                 SNDRV_CHMAP_TSR,        /* top side right */
287                 SNDRV_CHMAP_BC,         /* bottom center */
288                 SNDRV_CHMAP_RLC,        /* back left of center */
289                 SNDRV_CHMAP_RRC,        /* back right of center */
290                 0 /* terminator */
291         };
292         struct snd_pcm_chmap_elem *chmap;
293         const unsigned int *maps;
294         int c;
295 
296         if (channels > ARRAY_SIZE(chmap->map))
297                 return NULL;
298 
299         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
300         if (!chmap)
301                 return NULL;
302 
303         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
304         chmap->channels = channels;
305         c = 0;
306 
307         if (bits) {
308                 for (; bits && *maps; maps++, bits >>= 1)
309                         if (bits & 1)
310                                 chmap->map[c++] = *maps;
311         } else {
312                 /* If we're missing wChannelConfig, then guess something
313                     to make sure the channel map is not skipped entirely */
314                 if (channels == 1)
315                         chmap->map[c++] = SNDRV_CHMAP_MONO;
316                 else
317                         for (; c < channels && *maps; maps++)
318                                 chmap->map[c++] = *maps;
319         }
320 
321         for (; c < channels; c++)
322                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
323 
324         return chmap;
325 }
326 
327 /* UAC3 device stores channels information in Cluster Descriptors */
328 static struct
329 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
330                                                                 *cluster)
331 {
332         unsigned int channels = cluster->bNrChannels;
333         struct snd_pcm_chmap_elem *chmap;
334         void *p = cluster;
335         int len, c;
336 
337         if (channels > ARRAY_SIZE(chmap->map))
338                 return NULL;
339 
340         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
341         if (!chmap)
342                 return NULL;
343 
344         len = le16_to_cpu(cluster->wLength);
345         c = 0;
346         p += sizeof(struct uac3_cluster_header_descriptor);
347 
348         while (((p - (void *)cluster) < len) && (c < channels)) {
349                 struct uac3_cluster_segment_descriptor *cs_desc = p;
350                 u16 cs_len;
351                 u8 cs_type;
352 
353                 cs_len = le16_to_cpu(cs_desc->wLength);
354                 cs_type = cs_desc->bSegmentType;
355 
356                 if (cs_type == UAC3_CHANNEL_INFORMATION) {
357                         struct uac3_cluster_information_segment_descriptor *is = p;
358                         unsigned char map;
359 
360                         /*
361                          * TODO: this conversion is not complete, update it
362                          * after adding UAC3 values to asound.h
363                          */
364                         switch (is->bChRelationship) {
365                         case UAC3_CH_MONO:
366                                 map = SNDRV_CHMAP_MONO;
367                                 break;
368                         case UAC3_CH_LEFT:
369                         case UAC3_CH_FRONT_LEFT:
370                         case UAC3_CH_HEADPHONE_LEFT:
371                                 map = SNDRV_CHMAP_FL;
372                                 break;
373                         case UAC3_CH_RIGHT:
374                         case UAC3_CH_FRONT_RIGHT:
375                         case UAC3_CH_HEADPHONE_RIGHT:
376                                 map = SNDRV_CHMAP_FR;
377                                 break;
378                         case UAC3_CH_FRONT_CENTER:
379                                 map = SNDRV_CHMAP_FC;
380                                 break;
381                         case UAC3_CH_FRONT_LEFT_OF_CENTER:
382                                 map = SNDRV_CHMAP_FLC;
383                                 break;
384                         case UAC3_CH_FRONT_RIGHT_OF_CENTER:
385                                 map = SNDRV_CHMAP_FRC;
386                                 break;
387                         case UAC3_CH_SIDE_LEFT:
388                                 map = SNDRV_CHMAP_SL;
389                                 break;
390                         case UAC3_CH_SIDE_RIGHT:
391                                 map = SNDRV_CHMAP_SR;
392                                 break;
393                         case UAC3_CH_BACK_LEFT:
394                                 map = SNDRV_CHMAP_RL;
395                                 break;
396                         case UAC3_CH_BACK_RIGHT:
397                                 map = SNDRV_CHMAP_RR;
398                                 break;
399                         case UAC3_CH_BACK_CENTER:
400                                 map = SNDRV_CHMAP_RC;
401                                 break;
402                         case UAC3_CH_BACK_LEFT_OF_CENTER:
403                                 map = SNDRV_CHMAP_RLC;
404                                 break;
405                         case UAC3_CH_BACK_RIGHT_OF_CENTER:
406                                 map = SNDRV_CHMAP_RRC;
407                                 break;
408                         case UAC3_CH_TOP_CENTER:
409                                 map = SNDRV_CHMAP_TC;
410                                 break;
411                         case UAC3_CH_TOP_FRONT_LEFT:
412                                 map = SNDRV_CHMAP_TFL;
413                                 break;
414                         case UAC3_CH_TOP_FRONT_RIGHT:
415                                 map = SNDRV_CHMAP_TFR;
416                                 break;
417                         case UAC3_CH_TOP_FRONT_CENTER:
418                                 map = SNDRV_CHMAP_TFC;
419                                 break;
420                         case UAC3_CH_TOP_FRONT_LOC:
421                                 map = SNDRV_CHMAP_TFLC;
422                                 break;
423                         case UAC3_CH_TOP_FRONT_ROC:
424                                 map = SNDRV_CHMAP_TFRC;
425                                 break;
426                         case UAC3_CH_TOP_SIDE_LEFT:
427                                 map = SNDRV_CHMAP_TSL;
428                                 break;
429                         case UAC3_CH_TOP_SIDE_RIGHT:
430                                 map = SNDRV_CHMAP_TSR;
431                                 break;
432                         case UAC3_CH_TOP_BACK_LEFT:
433                                 map = SNDRV_CHMAP_TRL;
434                                 break;
435                         case UAC3_CH_TOP_BACK_RIGHT:
436                                 map = SNDRV_CHMAP_TRR;
437                                 break;
438                         case UAC3_CH_TOP_BACK_CENTER:
439                                 map = SNDRV_CHMAP_TRC;
440                                 break;
441                         case UAC3_CH_BOTTOM_CENTER:
442                                 map = SNDRV_CHMAP_BC;
443                                 break;
444                         case UAC3_CH_LOW_FREQUENCY_EFFECTS:
445                                 map = SNDRV_CHMAP_LFE;
446                                 break;
447                         case UAC3_CH_LFE_LEFT:
448                                 map = SNDRV_CHMAP_LLFE;
449                                 break;
450                         case UAC3_CH_LFE_RIGHT:
451                                 map = SNDRV_CHMAP_RLFE;
452                                 break;
453                         case UAC3_CH_RELATIONSHIP_UNDEFINED:
454                         default:
455                                 map = SNDRV_CHMAP_UNKNOWN;
456                                 break;
457                         }
458                         chmap->map[c++] = map;
459                 }
460                 p += cs_len;
461         }
462 
463         if (channels < c)
464                 pr_err("%s: channel number mismatch\n", __func__);
465 
466         chmap->channels = channels;
467 
468         for (; c < channels; c++)
469                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
470 
471         return chmap;
472 }
473 
474 /*
475  * add this endpoint to the chip instance.
476  * if a stream with the same endpoint already exists, append to it.
477  * if not, create a new pcm stream. note, fp is added to the substream
478  * fmt_list and will be freed on the chip instance release. do not free
479  * fp or do remove it from the substream fmt_list to avoid double-free.
480  */
481 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
482                                       int stream,
483                                       struct audioformat *fp,
484                                       struct snd_usb_power_domain *pd)
485 
486 {
487         struct snd_usb_stream *as;
488         struct snd_usb_substream *subs;
489         struct snd_pcm *pcm;
490         int err;
491 
492         list_for_each_entry(as, &chip->pcm_list, list) {
493                 if (as->fmt_type != fp->fmt_type)
494                         continue;
495                 subs = &as->substream[stream];
496                 if (subs->ep_num == fp->endpoint) {
497                         list_add_tail(&fp->list, &subs->fmt_list);
498                         subs->num_formats++;
499                         subs->formats |= fp->formats;
500                         return 0;
501                 }
502         }
503         /* look for an empty stream */
504         list_for_each_entry(as, &chip->pcm_list, list) {
505                 if (as->fmt_type != fp->fmt_type)
506                         continue;
507                 subs = &as->substream[stream];
508                 if (subs->ep_num)
509                         continue;
510                 err = snd_pcm_new_stream(as->pcm, stream, 1);
511                 if (err < 0)
512                         return err;
513                 snd_usb_init_substream(as, stream, fp, pd);
514                 return add_chmap(as->pcm, stream, subs);
515         }
516 
517         /* create a new pcm */
518         as = kzalloc(sizeof(*as), GFP_KERNEL);
519         if (!as)
520                 return -ENOMEM;
521         as->pcm_index = chip->pcm_devs;
522         as->chip = chip;
523         as->fmt_type = fp->fmt_type;
524         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
525                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
526                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
527                           &pcm);
528         if (err < 0) {
529                 kfree(as);
530                 return err;
531         }
532         as->pcm = pcm;
533         pcm->private_data = as;
534         pcm->private_free = snd_usb_audio_pcm_free;
535         pcm->info_flags = 0;
536         if (chip->pcm_devs > 0)
537                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
538         else
539                 strcpy(pcm->name, "USB Audio");
540 
541         snd_usb_init_substream(as, stream, fp, pd);
542 
543         /*
544          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
545          * fix to swap capture stream order in conf/cards/USB-audio.conf
546          */
547         if (chip->usb_id == USB_ID(0x0763, 0x2003))
548                 list_add(&as->list, &chip->pcm_list);
549         else
550                 list_add_tail(&as->list, &chip->pcm_list);
551 
552         chip->pcm_devs++;
553 
554         snd_usb_proc_pcm_format_add(as);
555 
556         return add_chmap(pcm, stream, &as->substream[stream]);
557 }
558 
559 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
560                              int stream,
561                              struct audioformat *fp)
562 {
563         return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
564 }
565 
566 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
567                                        int stream,
568                                        struct audioformat *fp,
569                                        struct snd_usb_power_domain *pd)
570 {
571         return __snd_usb_add_audio_stream(chip, stream, fp, pd);
572 }
573 
574 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
575                                          struct usb_host_interface *alts,
576                                          int protocol, int iface_no)
577 {
578         /* parsed with a v1 header here. that's ok as we only look at the
579          * header first which is the same for both versions */
580         struct uac_iso_endpoint_descriptor *csep;
581         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
582         int attributes = 0;
583 
584         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
585 
586         /* Creamware Noah has this descriptor after the 2nd endpoint */
587         if (!csep && altsd->bNumEndpoints >= 2)
588                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
589 
590         /*
591          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
592          * bytes after the first endpoint, go search the entire interface.
593          * Some devices have it directly *before* the standard endpoint.
594          */
595         if (!csep)
596                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
597 
598         if (!csep || csep->bLength < 7 ||
599             csep->bDescriptorSubtype != UAC_EP_GENERAL)
600                 goto error;
601 
602         if (protocol == UAC_VERSION_1) {
603                 attributes = csep->bmAttributes;
604         } else if (protocol == UAC_VERSION_2) {
605                 struct uac2_iso_endpoint_descriptor *csep2 =
606                         (struct uac2_iso_endpoint_descriptor *) csep;
607 
608                 if (csep2->bLength < sizeof(*csep2))
609                         goto error;
610                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
611 
612                 /* emulate the endpoint attributes of a v1 device */
613                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
614                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
615         } else { /* UAC_VERSION_3 */
616                 struct uac3_iso_endpoint_descriptor *csep3 =
617                         (struct uac3_iso_endpoint_descriptor *) csep;
618 
619                 if (csep3->bLength < sizeof(*csep3))
620                         goto error;
621                 /* emulate the endpoint attributes of a v1 device */
622                 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
623                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
624         }
625 
626         return attributes;
627 
628  error:
629         usb_audio_warn(chip,
630                        "%u:%d : no or invalid class specific endpoint descriptor\n",
631                        iface_no, altsd->bAlternateSetting);
632         return 0;
633 }
634 
635 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
636  * terminal id
637  */
638 static void *
639 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
640                                        int terminal_id, bool uac23)
641 {
642         struct uac2_input_terminal_descriptor *term = NULL;
643         size_t minlen = uac23 ? sizeof(struct uac2_input_terminal_descriptor) :
644                 sizeof(struct uac_input_terminal_descriptor);
645 
646         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
647                                                ctrl_iface->extralen,
648                                                term, UAC_INPUT_TERMINAL))) {
649                 if (term->bLength < minlen)
650                         continue;
651                 if (term->bTerminalID == terminal_id)
652                         return term;
653         }
654 
655         return NULL;
656 }
657 
658 static void *
659 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
660                                         int terminal_id)
661 {
662         /* OK to use with both UAC2 and UAC3 */
663         struct uac2_output_terminal_descriptor *term = NULL;
664 
665         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
666                                                ctrl_iface->extralen,
667                                                term, UAC_OUTPUT_TERMINAL))) {
668                 if (term->bLength >= sizeof(*term) &&
669                     term->bTerminalID == terminal_id)
670                         return term;
671         }
672 
673         return NULL;
674 }
675 
676 static struct audioformat *
677 audio_format_alloc_init(struct snd_usb_audio *chip,
678                        struct usb_host_interface *alts,
679                        int protocol, int iface_no, int altset_idx,
680                        int altno, int num_channels, int clock)
681 {
682         struct audioformat *fp;
683 
684         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
685         if (!fp)
686                 return NULL;
687 
688         fp->iface = iface_no;
689         fp->altsetting = altno;
690         fp->altset_idx = altset_idx;
691         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
692         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
693         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
694         fp->protocol = protocol;
695         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
696         fp->channels = num_channels;
697         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
698                 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
699                                 * (fp->maxpacksize & 0x7ff);
700         fp->clock = clock;
701         INIT_LIST_HEAD(&fp->list);
702 
703         return fp;
704 }
705 
706 static struct audioformat *
707 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
708                               struct usb_host_interface *alts,
709                               int protocol, int iface_no, int altset_idx,
710                               int altno, int stream, int bm_quirk)
711 {
712         struct usb_device *dev = chip->dev;
713         struct uac_format_type_i_continuous_descriptor *fmt;
714         unsigned int num_channels = 0, chconfig = 0;
715         struct audioformat *fp;
716         int clock = 0;
717         u64 format;
718 
719         /* get audio formats */
720         if (protocol == UAC_VERSION_1) {
721                 struct uac1_as_header_descriptor *as =
722                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
723                                                 NULL, UAC_AS_GENERAL);
724                 struct uac_input_terminal_descriptor *iterm;
725 
726                 if (!as) {
727                         dev_err(&dev->dev,
728                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
729                                 iface_no, altno);
730                         return NULL;
731                 }
732 
733                 if (as->bLength < sizeof(*as)) {
734                         dev_err(&dev->dev,
735                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
736                                 iface_no, altno);
737                         return NULL;
738                 }
739 
740                 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
741 
742                 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
743                                                                as->bTerminalLink,
744                                                                false);
745                 if (iterm) {
746                         num_channels = iterm->bNrChannels;
747                         chconfig = le16_to_cpu(iterm->wChannelConfig);
748                 }
749         } else { /* UAC_VERSION_2 */
750                 struct uac2_input_terminal_descriptor *input_term;
751                 struct uac2_output_terminal_descriptor *output_term;
752                 struct uac2_as_header_descriptor *as =
753                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
754                                                 NULL, UAC_AS_GENERAL);
755 
756                 if (!as) {
757                         dev_err(&dev->dev,
758                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
759                                 iface_no, altno);
760                         return NULL;
761                 }
762 
763                 if (as->bLength < sizeof(*as)) {
764                         dev_err(&dev->dev,
765                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
766                                 iface_no, altno);
767                         return NULL;
768                 }
769 
770                 num_channels = as->bNrChannels;
771                 format = le32_to_cpu(as->bmFormats);
772                 chconfig = le32_to_cpu(as->bmChannelConfig);
773 
774                 /*
775                  * lookup the terminal associated to this interface
776                  * to extract the clock
777                  */
778                 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
779                                                                     as->bTerminalLink,
780                                                                     true);
781                 if (input_term) {
782                         clock = input_term->bCSourceID;
783                         if (!chconfig && (num_channels == input_term->bNrChannels))
784                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
785                         goto found_clock;
786                 }
787 
788                 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
789                                                                       as->bTerminalLink);
790                 if (output_term) {
791                         clock = output_term->bCSourceID;
792                         goto found_clock;
793                 }
794 
795                 dev_err(&dev->dev,
796                         "%u:%d : bogus bTerminalLink %d\n",
797                         iface_no, altno, as->bTerminalLink);
798                 return NULL;
799         }
800 
801 found_clock:
802         /* get format type */
803         fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
804                                       NULL, UAC_FORMAT_TYPE);
805         if (!fmt) {
806                 dev_err(&dev->dev,
807                         "%u:%d : no UAC_FORMAT_TYPE desc\n",
808                         iface_no, altno);
809                 return NULL;
810         }
811         if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
812                         || ((protocol == UAC_VERSION_2) &&
813                                         (fmt->bLength < 6))) {
814                 dev_err(&dev->dev,
815                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
816                         iface_no, altno);
817                 return NULL;
818         }
819 
820         /*
821          * Blue Microphones workaround: The last altsetting is
822          * identical with the previous one, except for a larger
823          * packet size, but is actually a mislabeled two-channel
824          * setting; ignore it.
825          *
826          * Part 2: analyze quirk flag and format
827          */
828         if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
829                 return NULL;
830 
831         fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
832                                      altset_idx, altno, num_channels, clock);
833         if (!fp)
834                 return ERR_PTR(-ENOMEM);
835 
836         fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
837                                                        iface_no);
838 
839         /* some quirks for attributes here */
840         snd_usb_audioformat_attributes_quirk(chip, fp, stream);
841 
842         /* ok, let's parse further... */
843         if (snd_usb_parse_audio_format(chip, fp, format,
844                                         fmt, stream) < 0) {
845                 kfree(fp->rate_table);
846                 kfree(fp);
847                 return NULL;
848         }
849 
850         /* Create chmap */
851         if (fp->channels != num_channels)
852                 chconfig = 0;
853 
854         fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
855 
856         return fp;
857 }
858 
859 static struct audioformat *
860 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
861                              struct usb_host_interface *alts,
862                              struct snd_usb_power_domain **pd_out,
863                              int iface_no, int altset_idx,
864                              int altno, int stream)
865 {
866         struct usb_device *dev = chip->dev;
867         struct uac3_input_terminal_descriptor *input_term;
868         struct uac3_output_terminal_descriptor *output_term;
869         struct uac3_cluster_header_descriptor *cluster;
870         struct uac3_as_header_descriptor *as = NULL;
871         struct uac3_hc_descriptor_header hc_header;
872         struct snd_pcm_chmap_elem *chmap;
873         struct snd_usb_power_domain *pd;
874         unsigned char badd_profile;
875         u64 badd_formats = 0;
876         unsigned int num_channels;
877         struct audioformat *fp;
878         u16 cluster_id, wLength;
879         int clock = 0;
880         int err;
881 
882         badd_profile = chip->badd_profile;
883 
884         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
885                 unsigned int maxpacksize =
886                         le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
887 
888                 switch (maxpacksize) {
889                 default:
890                         dev_err(&dev->dev,
891                                 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
892                                 iface_no, altno);
893                         return NULL;
894                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
895                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
896                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
897                         num_channels = 1;
898                         break;
899                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
900                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
901                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
902                         num_channels = 1;
903                         break;
904                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
905                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
906                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
907                         num_channels = 2;
908                         break;
909                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
910                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
911                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
912                         num_channels = 2;
913                         break;
914                 }
915 
916                 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
917                 if (!chmap)
918                         return ERR_PTR(-ENOMEM);
919 
920                 if (num_channels == 1) {
921                         chmap->map[0] = SNDRV_CHMAP_MONO;
922                 } else {
923                         chmap->map[0] = SNDRV_CHMAP_FL;
924                         chmap->map[1] = SNDRV_CHMAP_FR;
925                 }
926 
927                 chmap->channels = num_channels;
928                 clock = UAC3_BADD_CS_ID9;
929                 goto found_clock;
930         }
931 
932         as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
933                                      NULL, UAC_AS_GENERAL);
934         if (!as) {
935                 dev_err(&dev->dev,
936                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
937                         iface_no, altno);
938                 return NULL;
939         }
940 
941         if (as->bLength < sizeof(*as)) {
942                 dev_err(&dev->dev,
943                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
944                         iface_no, altno);
945                 return NULL;
946         }
947 
948         cluster_id = le16_to_cpu(as->wClusterDescrID);
949         if (!cluster_id) {
950                 dev_err(&dev->dev,
951                         "%u:%d : no cluster descriptor\n",
952                         iface_no, altno);
953                 return NULL;
954         }
955 
956         /*
957          * Get number of channels and channel map through
958          * High Capability Cluster Descriptor
959          *
960          * First step: get High Capability header and
961          * read size of Cluster Descriptor
962          */
963         err = snd_usb_ctl_msg(chip->dev,
964                         usb_rcvctrlpipe(chip->dev, 0),
965                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
966                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
967                         cluster_id,
968                         snd_usb_ctrl_intf(chip),
969                         &hc_header, sizeof(hc_header));
970         if (err < 0)
971                 return ERR_PTR(err);
972         else if (err != sizeof(hc_header)) {
973                 dev_err(&dev->dev,
974                         "%u:%d : can't get High Capability descriptor\n",
975                         iface_no, altno);
976                 return ERR_PTR(-EIO);
977         }
978 
979         /*
980          * Second step: allocate needed amount of memory
981          * and request Cluster Descriptor
982          */
983         wLength = le16_to_cpu(hc_header.wLength);
984         cluster = kzalloc(wLength, GFP_KERNEL);
985         if (!cluster)
986                 return ERR_PTR(-ENOMEM);
987         err = snd_usb_ctl_msg(chip->dev,
988                         usb_rcvctrlpipe(chip->dev, 0),
989                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
990                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
991                         cluster_id,
992                         snd_usb_ctrl_intf(chip),
993                         cluster, wLength);
994         if (err < 0) {
995                 kfree(cluster);
996                 return ERR_PTR(err);
997         } else if (err != wLength) {
998                 dev_err(&dev->dev,
999                         "%u:%d : can't get Cluster Descriptor\n",
1000                         iface_no, altno);
1001                 kfree(cluster);
1002                 return ERR_PTR(-EIO);
1003         }
1004 
1005         num_channels = cluster->bNrChannels;
1006         chmap = convert_chmap_v3(cluster);
1007         kfree(cluster);
1008 
1009         /*
1010          * lookup the terminal associated to this interface
1011          * to extract the clock
1012          */
1013         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1014                                                             as->bTerminalLink,
1015                                                             true);
1016         if (input_term) {
1017                 clock = input_term->bCSourceID;
1018                 goto found_clock;
1019         }
1020 
1021         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1022                                                              as->bTerminalLink);
1023         if (output_term) {
1024                 clock = output_term->bCSourceID;
1025                 goto found_clock;
1026         }
1027 
1028         dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1029                         iface_no, altno, as->bTerminalLink);
1030         kfree(chmap);
1031         return NULL;
1032 
1033 found_clock:
1034         fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1035                                      altset_idx, altno, num_channels, clock);
1036         if (!fp) {
1037                 kfree(chmap);
1038                 return ERR_PTR(-ENOMEM);
1039         }
1040 
1041         fp->chmap = chmap;
1042 
1043         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1044                 fp->attributes = 0; /* No attributes */
1045 
1046                 fp->fmt_type = UAC_FORMAT_TYPE_I;
1047                 fp->formats = badd_formats;
1048 
1049                 fp->nr_rates = 0;       /* SNDRV_PCM_RATE_CONTINUOUS */
1050                 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1051                 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1052                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1053 
1054                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1055                 if (!pd) {
1056                         kfree(fp->rate_table);
1057                         kfree(fp);
1058                         return NULL;
1059                 }
1060                 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1061                                         UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1062                 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1063                 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1064 
1065         } else {
1066                 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1067                                                                UAC_VERSION_3,
1068                                                                iface_no);
1069 
1070                 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1071                                                as->bTerminalLink);
1072 
1073                 /* ok, let's parse further... */
1074                 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1075                         kfree(pd);
1076                         kfree(fp->chmap);
1077                         kfree(fp->rate_table);
1078                         kfree(fp);
1079                         return NULL;
1080                 }
1081         }
1082 
1083         if (pd)
1084                 *pd_out = pd;
1085 
1086         return fp;
1087 }
1088 
1089 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1090 {
1091         struct usb_device *dev;
1092         struct usb_interface *iface;
1093         struct usb_host_interface *alts;
1094         struct usb_interface_descriptor *altsd;
1095         int i, altno, err, stream;
1096         struct audioformat *fp = NULL;
1097         struct snd_usb_power_domain *pd = NULL;
1098         int num, protocol;
1099 
1100         dev = chip->dev;
1101 
1102         /* parse the interface's altsettings */
1103         iface = usb_ifnum_to_if(dev, iface_no);
1104 
1105         num = iface->num_altsetting;
1106 
1107         /*
1108          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1109          * one misses syncpipe, and does not produce any sound.
1110          */
1111         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1112                 num = 4;
1113 
1114         for (i = 0; i < num; i++) {
1115                 alts = &iface->altsetting[i];
1116                 altsd = get_iface_desc(alts);
1117                 protocol = altsd->bInterfaceProtocol;
1118                 /* skip invalid one */
1119                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1120                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1121                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1122                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1123                     altsd->bNumEndpoints < 1 ||
1124                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1125                         continue;
1126                 /* must be isochronous */
1127                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1128                     USB_ENDPOINT_XFER_ISOC)
1129                         continue;
1130                 /* check direction */
1131                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1132                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1133                 altno = altsd->bAlternateSetting;
1134 
1135                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1136                         continue;
1137 
1138                 /*
1139                  * Roland audio streaming interfaces are marked with protocols
1140                  * 0/1/2, but are UAC 1 compatible.
1141                  */
1142                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1143                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1144                     protocol <= 2)
1145                         protocol = UAC_VERSION_1;
1146 
1147                 switch (protocol) {
1148                 default:
1149                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1150                                 iface_no, altno, protocol);
1151                         protocol = UAC_VERSION_1;
1152                         /* fall through */
1153                 case UAC_VERSION_1:
1154                         /* fall through */
1155                 case UAC_VERSION_2: {
1156                         int bm_quirk = 0;
1157 
1158                         /*
1159                          * Blue Microphones workaround: The last altsetting is
1160                          * identical with the previous one, except for a larger
1161                          * packet size, but is actually a mislabeled two-channel
1162                          * setting; ignore it.
1163                          *
1164                          * Part 1: prepare quirk flag
1165                          */
1166                         if (altno == 2 && num == 3 &&
1167                             fp && fp->altsetting == 1 && fp->channels == 1 &&
1168                             fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1169                             protocol == UAC_VERSION_1 &&
1170                             le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1171                                                         fp->maxpacksize * 2)
1172                                 bm_quirk = 1;
1173 
1174                         fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1175                                                            iface_no, i, altno,
1176                                                            stream, bm_quirk);
1177                         break;
1178                 }
1179                 case UAC_VERSION_3:
1180                         fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1181                                                 iface_no, i, altno, stream);
1182                         break;
1183                 }
1184 
1185                 if (!fp)
1186                         continue;
1187                 else if (IS_ERR(fp))
1188                         return PTR_ERR(fp);
1189 
1190                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1191                 if (protocol == UAC_VERSION_3)
1192                         err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1193                 else
1194                         err = snd_usb_add_audio_stream(chip, stream, fp);
1195 
1196                 if (err < 0) {
1197                         list_del(&fp->list); /* unlink for avoiding double-free */
1198                         kfree(pd);
1199                         kfree(fp->rate_table);
1200                         kfree(fp->chmap);
1201                         kfree(fp);
1202                         return err;
1203                 }
1204                 /* try to set the interface... */
1205                 usb_set_interface(chip->dev, iface_no, altno);
1206                 snd_usb_init_pitch(chip, iface_no, alts, fp);
1207                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1208         }
1209         return 0;
1210 }
1211 
1212 

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