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
audioformat_free(struct audioformat * fp)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 */
free_substream(struct snd_usb_substream * subs)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->str_pd);
51 snd_media_stream_delete(subs);
52 }
53
54
55 /*
56 * free a usb stream instance
57 */
snd_usb_audio_stream_free(struct snd_usb_stream * stream)58 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
59 {
60 free_substream(&stream->substream[0]);
61 free_substream(&stream->substream[1]);
62 list_del(&stream->list);
63 kfree(stream);
64 }
65
snd_usb_audio_pcm_free(struct snd_pcm * pcm)66 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
67 {
68 struct snd_usb_stream *stream = pcm->private_data;
69 if (stream) {
70 stream->pcm = NULL;
71 snd_usb_audio_stream_free(stream);
72 }
73 }
74
75 /*
76 * initialize the substream instance.
77 */
78
snd_usb_init_substream(struct snd_usb_stream * as,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)79 static void snd_usb_init_substream(struct snd_usb_stream *as,
80 int stream,
81 struct audioformat *fp,
82 struct snd_usb_power_domain *pd)
83 {
84 struct snd_usb_substream *subs = &as->substream[stream];
85
86 INIT_LIST_HEAD(&subs->fmt_list);
87 spin_lock_init(&subs->lock);
88
89 subs->stream = as;
90 subs->direction = stream;
91 subs->dev = as->chip->dev;
92 subs->txfr_quirk = !!(as->chip->quirk_flags & QUIRK_FLAG_ALIGN_TRANSFER);
93 subs->tx_length_quirk = !!(as->chip->quirk_flags & QUIRK_FLAG_TX_LENGTH);
94 subs->speed = snd_usb_get_speed(subs->dev);
95 subs->pkt_offset_adj = 0;
96 subs->stream_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 */
usb_chmap_ctl_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 */
have_dup_chmap(struct snd_usb_substream * subs,struct audioformat * fp)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
usb_chmap_ctl_tlv(struct snd_kcontrol * kcontrol,int op_flag,unsigned int size,unsigned int __user * tlv)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
usb_chmap_ctl_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 = 0;
196
197 if (subs->cur_audiofmt)
198 chmap = subs->cur_audiofmt->chmap;
199 if (chmap) {
200 for (i = 0; i < chmap->channels; i++)
201 ucontrol->value.integer.value[i] = chmap->map[i];
202 }
203 for (; i < subs->channels_max; i++)
204 ucontrol->value.integer.value[i] = 0;
205 return 0;
206 }
207
208 /* create a chmap kctl assigned to the given USB substream */
add_chmap(struct snd_pcm * pcm,int stream,struct snd_usb_substream * subs)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 */
convert_chmap(int channels,unsigned int bits,int protocol)239 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
240 int protocol)
241 {
242 static const 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_RL, /* left surround */
248 SNDRV_CHMAP_RR, /* 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 const 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_obj(*chmap);
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 if (c == chmap->channels)
307 break;
308 }
309 } else {
310 /* If we're missing wChannelConfig, then guess something
311 to make sure the channel map is not skipped entirely */
312 if (channels == 1)
313 chmap->map[c++] = SNDRV_CHMAP_MONO;
314 else
315 for (; c < channels && *maps; maps++)
316 chmap->map[c++] = *maps;
317 }
318
319 for (; c < channels; c++)
320 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
321
322 return chmap;
323 }
324
325 /* UAC3 device stores channels information in Cluster Descriptors */
326 static struct
convert_chmap_v3(struct uac3_cluster_header_descriptor * cluster)327 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
328 *cluster)
329 {
330 unsigned int channels = cluster->bNrChannels;
331 struct snd_pcm_chmap_elem *chmap;
332 void *p = cluster;
333 int len, c;
334
335 if (channels > ARRAY_SIZE(chmap->map))
336 return NULL;
337
338 chmap = kzalloc_obj(*chmap);
339 if (!chmap)
340 return NULL;
341
342 len = le16_to_cpu(cluster->wLength);
343 c = 0;
344 p += sizeof(*cluster);
345 len -= sizeof(*cluster);
346
347 while (len > 0 && (c < channels)) {
348 struct uac3_cluster_segment_descriptor *cs_desc = p;
349 u16 cs_len;
350 u8 cs_type;
351
352 if (len < sizeof(*cs_desc))
353 break;
354 cs_len = le16_to_cpu(cs_desc->wLength);
355 if (len < cs_len)
356 break;
357 cs_type = cs_desc->bSegmentType;
358
359 if (cs_type == UAC3_CHANNEL_INFORMATION) {
360 struct uac3_cluster_information_segment_descriptor *is = p;
361 unsigned char map;
362
363 if (cs_len < sizeof(*is))
364 break;
365
366 /*
367 * TODO: this conversion is not complete, update it
368 * after adding UAC3 values to asound.h
369 * NOTE: not all UAC3 channel relationship have a
370 * direct ALSA chmap equivalent.
371 */
372 switch (is->bChRelationship) {
373 case UAC3_CH_MONO:
374 map = SNDRV_CHMAP_MONO;
375 break;
376 case UAC3_CH_LEFT:
377 case UAC3_CH_FRONT_LEFT:
378 case UAC3_CH_HEADPHONE_LEFT:
379 map = SNDRV_CHMAP_FL;
380 break;
381 case UAC3_CH_RIGHT:
382 case UAC3_CH_FRONT_RIGHT:
383 case UAC3_CH_HEADPHONE_RIGHT:
384 map = SNDRV_CHMAP_FR;
385 break;
386 case UAC3_CH_FRONT_CENTER:
387 map = SNDRV_CHMAP_FC;
388 break;
389 case UAC3_CH_FRONT_LEFT_OF_CENTER:
390 map = SNDRV_CHMAP_FLC;
391 break;
392 case UAC3_CH_FRONT_RIGHT_OF_CENTER:
393 map = SNDRV_CHMAP_FRC;
394 break;
395 case UAC3_CH_FRONT_WIDE_LEFT:
396 map = SNDRV_CHMAP_FLW;
397 break;
398 case UAC3_CH_FRONT_WIDE_RIGHT:
399 map = SNDRV_CHMAP_FRW;
400 break;
401 case UAC3_CH_SIDE_LEFT:
402 map = SNDRV_CHMAP_SL;
403 break;
404 case UAC3_CH_SIDE_RIGHT:
405 map = SNDRV_CHMAP_SR;
406 break;
407 case UAC3_CH_BACK_LEFT:
408 map = SNDRV_CHMAP_RL;
409 break;
410 case UAC3_CH_BACK_RIGHT:
411 map = SNDRV_CHMAP_RR;
412 break;
413 case UAC3_CH_BACK_CENTER:
414 map = SNDRV_CHMAP_RC;
415 break;
416 case UAC3_CH_BACK_LEFT_OF_CENTER:
417 map = SNDRV_CHMAP_RLC;
418 break;
419 case UAC3_CH_BACK_RIGHT_OF_CENTER:
420 map = SNDRV_CHMAP_RRC;
421 break;
422 case UAC3_CH_TOP_CENTER:
423 map = SNDRV_CHMAP_TC;
424 break;
425 case UAC3_CH_TOP_FRONT_LEFT:
426 map = SNDRV_CHMAP_TFL;
427 break;
428 case UAC3_CH_TOP_FRONT_RIGHT:
429 map = SNDRV_CHMAP_TFR;
430 break;
431 case UAC3_CH_TOP_FRONT_CENTER:
432 map = SNDRV_CHMAP_TFC;
433 break;
434 case UAC3_CH_TOP_FRONT_LOC:
435 map = SNDRV_CHMAP_TFLC;
436 break;
437 case UAC3_CH_TOP_FRONT_ROC:
438 map = SNDRV_CHMAP_TFRC;
439 break;
440 case UAC3_CH_TOP_SIDE_LEFT:
441 map = SNDRV_CHMAP_TSL;
442 break;
443 case UAC3_CH_TOP_SIDE_RIGHT:
444 map = SNDRV_CHMAP_TSR;
445 break;
446 case UAC3_CH_TOP_BACK_LEFT:
447 map = SNDRV_CHMAP_TRL;
448 break;
449 case UAC3_CH_TOP_BACK_RIGHT:
450 map = SNDRV_CHMAP_TRR;
451 break;
452 case UAC3_CH_TOP_BACK_CENTER:
453 map = SNDRV_CHMAP_TRC;
454 break;
455 case UAC3_CH_BOTTOM_CENTER:
456 map = SNDRV_CHMAP_BC;
457 break;
458 case UAC3_CH_LOW_FREQUENCY_EFFECTS:
459 map = SNDRV_CHMAP_LFE;
460 break;
461 case UAC3_CH_LFE_LEFT:
462 map = SNDRV_CHMAP_LLFE;
463 break;
464 case UAC3_CH_LFE_RIGHT:
465 map = SNDRV_CHMAP_RLFE;
466 break;
467 case UAC3_CH_RELATIONSHIP_UNDEFINED:
468 default:
469 map = SNDRV_CHMAP_UNKNOWN;
470 break;
471 }
472 chmap->map[c++] = map;
473 }
474 p += cs_len;
475 len -= cs_len;
476 }
477
478 if (channels < c)
479 pr_err("%s: channel number mismatch\n", __func__);
480
481 chmap->channels = channels;
482
483 for (; c < channels; c++)
484 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
485
486 return chmap;
487 }
488
489 /*
490 * add this endpoint to the chip instance.
491 * if a stream with the same endpoint already exists, append to it.
492 * if not, create a new pcm stream. note, fp is added to the substream
493 * fmt_list and will be freed on the chip instance release. do not free
494 * fp or do remove it from the substream fmt_list to avoid double-free.
495 */
__snd_usb_add_audio_stream(struct snd_usb_audio * chip,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)496 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
497 int stream,
498 struct audioformat *fp,
499 struct snd_usb_power_domain *pd)
500
501 {
502 struct snd_usb_stream *as;
503 struct snd_usb_substream *subs;
504 struct snd_pcm *pcm;
505 int err;
506
507 list_for_each_entry(as, &chip->pcm_list, list) {
508 if (as->fmt_type != fp->fmt_type)
509 continue;
510 subs = &as->substream[stream];
511 if (subs->ep_num == fp->endpoint) {
512 list_add_tail(&fp->list, &subs->fmt_list);
513 subs->num_formats++;
514 subs->formats |= fp->formats;
515 return 0;
516 }
517 }
518
519 if (chip->card->registered)
520 chip->need_delayed_register = true;
521
522 /* look for an empty stream */
523 list_for_each_entry(as, &chip->pcm_list, list) {
524 if (as->fmt_type != fp->fmt_type)
525 continue;
526 subs = &as->substream[stream];
527 if (subs->ep_num)
528 continue;
529 err = snd_pcm_new_stream(as->pcm, stream, 1);
530 if (err < 0)
531 return err;
532 snd_usb_init_substream(as, stream, fp, pd);
533 return add_chmap(as->pcm, stream, subs);
534 }
535
536 /* create a new pcm */
537 as = kzalloc_obj(*as);
538 if (!as)
539 return -ENOMEM;
540 as->pcm_index = chip->pcm_devs;
541 as->chip = chip;
542 as->fmt_type = fp->fmt_type;
543 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
544 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
545 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
546 &pcm);
547 if (err < 0) {
548 kfree(as);
549 return err;
550 }
551 as->pcm = pcm;
552 pcm->private_data = as;
553 pcm->private_free = snd_usb_audio_pcm_free;
554 pcm->info_flags = 0;
555 if (chip->pcm_devs > 0)
556 scnprintf(pcm->name, sizeof(pcm->name), "USB Audio #%d",
557 chip->pcm_devs);
558 else
559 strscpy(pcm->name, "USB Audio");
560
561 snd_usb_init_substream(as, stream, fp, pd);
562
563 /*
564 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
565 * fix to swap capture stream order in conf/cards/USB-audio.conf
566 */
567 if (chip->usb_id == USB_ID(0x0763, 0x2003))
568 list_add(&as->list, &chip->pcm_list);
569 else
570 list_add_tail(&as->list, &chip->pcm_list);
571
572 chip->pcm_devs++;
573
574 snd_usb_proc_pcm_format_add(as);
575
576 return add_chmap(pcm, stream, &as->substream[stream]);
577 }
578
snd_usb_add_audio_stream(struct snd_usb_audio * chip,int stream,struct audioformat * fp)579 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
580 int stream,
581 struct audioformat *fp)
582 {
583 return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
584 }
585
snd_usb_add_audio_stream_v3(struct snd_usb_audio * chip,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)586 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
587 int stream,
588 struct audioformat *fp,
589 struct snd_usb_power_domain *pd)
590 {
591 return __snd_usb_add_audio_stream(chip, stream, fp, pd);
592 }
593
parse_uac_endpoint_attributes(struct snd_usb_audio * chip,struct usb_host_interface * alts,int protocol,int iface_no)594 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
595 struct usb_host_interface *alts,
596 int protocol, int iface_no)
597 {
598 /* parsed with a v1 header here. that's ok as we only look at the
599 * header first which is the same for both versions */
600 struct uac_iso_endpoint_descriptor *csep;
601 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
602 int attributes = 0;
603
604 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
605
606 /* Creamware Noah has this descriptor after the 2nd endpoint */
607 if (!csep && altsd->bNumEndpoints >= 2)
608 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
609
610 /*
611 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
612 * bytes after the first endpoint, go search the entire interface.
613 * Some devices have it directly *before* the standard endpoint.
614 */
615 if (!csep)
616 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
617
618 if (!csep || csep->bLength < 7 ||
619 csep->bDescriptorSubtype != UAC_EP_GENERAL)
620 goto error;
621
622 if (protocol == UAC_VERSION_1) {
623 attributes = csep->bmAttributes;
624 } else if (protocol == UAC_VERSION_2) {
625 struct uac2_iso_endpoint_descriptor *csep2 =
626 (struct uac2_iso_endpoint_descriptor *) csep;
627
628 if (csep2->bLength < sizeof(*csep2))
629 goto error;
630 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
631
632 /* emulate the endpoint attributes of a v1 device */
633 if (csep2->bmControls & UAC2_CONTROL_PITCH)
634 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
635 } else { /* UAC_VERSION_3 */
636 struct uac3_iso_endpoint_descriptor *csep3 =
637 (struct uac3_iso_endpoint_descriptor *) csep;
638
639 if (csep3->bLength < sizeof(*csep3))
640 goto error;
641 /* emulate the endpoint attributes of a v1 device */
642 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
643 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
644 }
645
646 return attributes;
647
648 error:
649 usb_audio_warn(chip,
650 "%u:%d : no or invalid class specific endpoint descriptor\n",
651 iface_no, altsd->bAlternateSetting);
652 return 0;
653 }
654
655 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
656 * terminal id
657 */
658 static void *
snd_usb_find_input_terminal_descriptor(struct usb_host_interface * ctrl_iface,int terminal_id,int protocol)659 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
660 int terminal_id, int protocol)
661 {
662 struct uac2_input_terminal_descriptor *term = NULL;
663
664 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
665 ctrl_iface->extralen,
666 term, UAC_INPUT_TERMINAL))) {
667 if (!snd_usb_validate_audio_desc(term, protocol))
668 continue;
669 if (term->bTerminalID == terminal_id)
670 return term;
671 }
672
673 return NULL;
674 }
675
676 static void *
snd_usb_find_output_terminal_descriptor(struct usb_host_interface * ctrl_iface,int terminal_id,int protocol)677 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
678 int terminal_id, int protocol)
679 {
680 /* OK to use with both UAC2 and UAC3 */
681 struct uac2_output_terminal_descriptor *term = NULL;
682
683 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
684 ctrl_iface->extralen,
685 term, UAC_OUTPUT_TERMINAL))) {
686 if (!snd_usb_validate_audio_desc(term, protocol))
687 continue;
688 if (term->bTerminalID == terminal_id)
689 return term;
690 }
691
692 return NULL;
693 }
694
695 static struct audioformat *
audio_format_alloc_init(struct snd_usb_audio * chip,struct usb_host_interface * alts,int protocol,int iface_no,int altset_idx,int altno,int num_channels,int clock)696 audio_format_alloc_init(struct snd_usb_audio *chip,
697 struct usb_host_interface *alts,
698 int protocol, int iface_no, int altset_idx,
699 int altno, int num_channels, int clock)
700 {
701 struct usb_host_endpoint *ep = &alts->endpoint[0];
702 struct audioformat *fp;
703
704 fp = kzalloc_obj(*fp);
705 if (!fp)
706 return NULL;
707
708 fp->iface = iface_no;
709 fp->altsetting = altno;
710 fp->altset_idx = altset_idx;
711 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
712 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
713 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
714 fp->protocol = protocol;
715 fp->maxpacksize = usb_endpoint_max_periodic_payload(chip->dev, ep);
716 fp->channels = num_channels;
717 fp->clock = clock;
718 INIT_LIST_HEAD(&fp->list);
719
720 return fp;
721 }
722
723 static struct audioformat *
snd_usb_get_audioformat_uac12(struct snd_usb_audio * chip,struct usb_host_interface * alts,int protocol,int iface_no,int altset_idx,int altno,int stream,int bm_quirk)724 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
725 struct usb_host_interface *alts,
726 int protocol, int iface_no, int altset_idx,
727 int altno, int stream, int bm_quirk)
728 {
729 struct usb_device *dev = chip->dev;
730 struct uac_format_type_i_continuous_descriptor *fmt;
731 unsigned int num_channels = 0, chconfig = 0;
732 struct usb_host_interface *ctrl_intf;
733 struct audioformat *fp;
734 int clock = 0;
735 u64 format;
736
737 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
738
739 /* get audio formats */
740 if (protocol == UAC_VERSION_1) {
741 struct uac1_as_header_descriptor *as =
742 snd_usb_find_csint_desc(alts->extra, alts->extralen,
743 NULL, UAC_AS_GENERAL);
744 struct uac_input_terminal_descriptor *iterm;
745
746 if (!as) {
747 dev_err(&dev->dev,
748 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
749 iface_no, altno);
750 return NULL;
751 }
752
753 if (as->bLength < sizeof(*as)) {
754 dev_err(&dev->dev,
755 "%u:%d : invalid UAC_AS_GENERAL desc\n",
756 iface_no, altno);
757 return NULL;
758 }
759
760 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
761
762 iterm = snd_usb_find_input_terminal_descriptor(ctrl_intf,
763 as->bTerminalLink,
764 protocol);
765 if (iterm) {
766 num_channels = iterm->bNrChannels;
767 chconfig = le16_to_cpu(iterm->wChannelConfig);
768 }
769 } else { /* UAC_VERSION_2 */
770 struct uac2_input_terminal_descriptor *input_term;
771 struct uac2_output_terminal_descriptor *output_term;
772 struct uac2_as_header_descriptor *as =
773 snd_usb_find_csint_desc(alts->extra, alts->extralen,
774 NULL, UAC_AS_GENERAL);
775
776 if (!as) {
777 dev_err(&dev->dev,
778 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
779 iface_no, altno);
780 return NULL;
781 }
782
783 if (as->bLength < sizeof(*as)) {
784 dev_err(&dev->dev,
785 "%u:%d : invalid UAC_AS_GENERAL desc\n",
786 iface_no, altno);
787 return NULL;
788 }
789
790 num_channels = as->bNrChannels;
791 format = le32_to_cpu(as->bmFormats);
792 chconfig = le32_to_cpu(as->bmChannelConfig);
793
794 /*
795 * lookup the terminal associated to this interface
796 * to extract the clock
797 */
798 input_term = snd_usb_find_input_terminal_descriptor(ctrl_intf,
799 as->bTerminalLink,
800 protocol);
801 if (input_term) {
802 clock = input_term->bCSourceID;
803 if (!chconfig && (num_channels == input_term->bNrChannels))
804 chconfig = le32_to_cpu(input_term->bmChannelConfig);
805 goto found_clock;
806 }
807
808 output_term = snd_usb_find_output_terminal_descriptor(ctrl_intf,
809 as->bTerminalLink,
810 protocol);
811 if (output_term) {
812 clock = output_term->bCSourceID;
813 goto found_clock;
814 }
815
816 dev_err(&dev->dev,
817 "%u:%d : bogus bTerminalLink %d\n",
818 iface_no, altno, as->bTerminalLink);
819 return NULL;
820 }
821
822 found_clock:
823 /* get format type */
824 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
825 NULL, UAC_FORMAT_TYPE);
826 if (!fmt) {
827 dev_err(&dev->dev,
828 "%u:%d : no UAC_FORMAT_TYPE desc\n",
829 iface_no, altno);
830 return NULL;
831 }
832 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
833 || ((protocol == UAC_VERSION_2) &&
834 (fmt->bLength < 6))) {
835 dev_err(&dev->dev,
836 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
837 iface_no, altno);
838 return NULL;
839 }
840
841 /*
842 * Blue Microphones workaround: The last altsetting is
843 * identical with the previous one, except for a larger
844 * packet size, but is actually a mislabeled two-channel
845 * setting; ignore it.
846 *
847 * Part 2: analyze quirk flag and format
848 */
849 if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
850 return NULL;
851
852 fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
853 altset_idx, altno, num_channels, clock);
854 if (!fp)
855 return ERR_PTR(-ENOMEM);
856
857 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
858 iface_no);
859
860 /* some quirks for attributes here */
861 snd_usb_audioformat_attributes_quirk(chip, fp, stream);
862
863 /* ok, let's parse further... */
864 if (snd_usb_parse_audio_format(chip, fp, format,
865 fmt, stream) < 0) {
866 audioformat_free(fp);
867 return NULL;
868 }
869
870 /* Create chmap */
871 if (fp->channels != num_channels)
872 chconfig = 0;
873
874 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
875
876 return fp;
877 }
878
879 static struct audioformat *
snd_usb_get_audioformat_uac3(struct snd_usb_audio * chip,struct usb_host_interface * alts,struct snd_usb_power_domain ** pd_out,int iface_no,int altset_idx,int altno,int stream)880 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
881 struct usb_host_interface *alts,
882 struct snd_usb_power_domain **pd_out,
883 int iface_no, int altset_idx,
884 int altno, int stream)
885 {
886 struct usb_device *dev = chip->dev;
887 struct uac3_input_terminal_descriptor *input_term;
888 struct uac3_output_terminal_descriptor *output_term;
889 struct uac3_cluster_header_descriptor *cluster;
890 struct uac3_as_header_descriptor *as = NULL;
891 struct uac3_hc_descriptor_header hc_header;
892 struct usb_host_interface *ctrl_intf;
893 struct snd_pcm_chmap_elem *chmap;
894 struct snd_usb_power_domain *pd;
895 unsigned char badd_profile;
896 u64 badd_formats = 0;
897 unsigned int num_channels;
898 struct audioformat *fp;
899 u16 cluster_id, wLength, cluster_wLength;
900 int clock = 0;
901 int err;
902
903 badd_profile = chip->badd_profile;
904 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
905
906 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
907 unsigned int maxpacksize =
908 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
909
910 switch (maxpacksize) {
911 default:
912 dev_err(&dev->dev,
913 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
914 iface_no, altno);
915 return NULL;
916 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
917 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
918 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
919 num_channels = 1;
920 break;
921 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
922 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
923 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
924 num_channels = 1;
925 break;
926 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
927 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
928 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
929 num_channels = 2;
930 break;
931 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
932 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
933 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
934 num_channels = 2;
935 break;
936 }
937
938 chmap = kzalloc_obj(*chmap);
939 if (!chmap)
940 return ERR_PTR(-ENOMEM);
941
942 if (num_channels == 1) {
943 chmap->map[0] = SNDRV_CHMAP_MONO;
944 } else {
945 chmap->map[0] = SNDRV_CHMAP_FL;
946 chmap->map[1] = SNDRV_CHMAP_FR;
947 }
948
949 chmap->channels = num_channels;
950 clock = UAC3_BADD_CS_ID9;
951 goto found_clock;
952 }
953
954 as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
955 NULL, UAC_AS_GENERAL);
956 if (!as) {
957 dev_err(&dev->dev,
958 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
959 iface_no, altno);
960 return NULL;
961 }
962
963 if (as->bLength < sizeof(*as)) {
964 dev_err(&dev->dev,
965 "%u:%d : invalid UAC_AS_GENERAL desc\n",
966 iface_no, altno);
967 return NULL;
968 }
969
970 cluster_id = le16_to_cpu(as->wClusterDescrID);
971 if (!cluster_id) {
972 dev_err(&dev->dev,
973 "%u:%d : no cluster descriptor\n",
974 iface_no, altno);
975 return NULL;
976 }
977
978 /*
979 * Get number of channels and channel map through
980 * High Capability Cluster Descriptor
981 *
982 * First step: get High Capability header and
983 * read size of Cluster Descriptor
984 */
985 err = snd_usb_ctl_msg(chip->dev,
986 usb_rcvctrlpipe(chip->dev, 0),
987 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
988 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
989 cluster_id,
990 snd_usb_ctrl_intf(ctrl_intf),
991 &hc_header, sizeof(hc_header));
992 if (err < 0)
993 return ERR_PTR(err);
994 else if (err != sizeof(hc_header)) {
995 dev_err(&dev->dev,
996 "%u:%d : can't get High Capability descriptor\n",
997 iface_no, altno);
998 return ERR_PTR(-EIO);
999 }
1000
1001 /*
1002 * Second step: allocate needed amount of memory
1003 * and request Cluster Descriptor
1004 */
1005 wLength = le16_to_cpu(hc_header.wLength);
1006 if (wLength < sizeof(cluster))
1007 return NULL;
1008 cluster = kzalloc(wLength, GFP_KERNEL);
1009 if (!cluster)
1010 return ERR_PTR(-ENOMEM);
1011 err = snd_usb_ctl_msg(chip->dev,
1012 usb_rcvctrlpipe(chip->dev, 0),
1013 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
1014 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1015 cluster_id,
1016 snd_usb_ctrl_intf(ctrl_intf),
1017 cluster, wLength);
1018 if (err < 0) {
1019 kfree(cluster);
1020 return ERR_PTR(err);
1021 } else if (err != wLength) {
1022 dev_err(&dev->dev,
1023 "%u:%d : can't get Cluster Descriptor\n",
1024 iface_no, altno);
1025 kfree(cluster);
1026 return ERR_PTR(-EIO);
1027 }
1028
1029 cluster_wLength = le16_to_cpu(cluster->wLength);
1030 if (cluster_wLength < sizeof(*cluster) ||
1031 cluster_wLength > wLength) {
1032 dev_err(&dev->dev,
1033 "%u:%d : invalid Cluster Descriptor size\n",
1034 iface_no, altno);
1035 kfree(cluster);
1036 return ERR_PTR(-EIO);
1037 }
1038
1039 num_channels = cluster->bNrChannels;
1040 chmap = convert_chmap_v3(cluster);
1041 kfree(cluster);
1042
1043 /*
1044 * lookup the terminal associated to this interface
1045 * to extract the clock
1046 */
1047 input_term = snd_usb_find_input_terminal_descriptor(ctrl_intf,
1048 as->bTerminalLink,
1049 UAC_VERSION_3);
1050 if (input_term) {
1051 clock = input_term->bCSourceID;
1052 goto found_clock;
1053 }
1054
1055 output_term = snd_usb_find_output_terminal_descriptor(ctrl_intf,
1056 as->bTerminalLink,
1057 UAC_VERSION_3);
1058 if (output_term) {
1059 clock = output_term->bCSourceID;
1060 goto found_clock;
1061 }
1062
1063 dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1064 iface_no, altno, as->bTerminalLink);
1065 kfree(chmap);
1066 return NULL;
1067
1068 found_clock:
1069 fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1070 altset_idx, altno, num_channels, clock);
1071 if (!fp) {
1072 kfree(chmap);
1073 return ERR_PTR(-ENOMEM);
1074 }
1075
1076 fp->chmap = chmap;
1077
1078 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1079 fp->attributes = 0; /* No attributes */
1080
1081 fp->fmt_type = UAC_FORMAT_TYPE_I;
1082 fp->formats = badd_formats;
1083
1084 fp->nr_rates = 0; /* SNDRV_PCM_RATE_CONTINUOUS */
1085 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1086 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1087 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1088
1089 pd = kzalloc_obj(*pd);
1090 if (!pd) {
1091 audioformat_free(fp);
1092 return NULL;
1093 }
1094 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1095 UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1096 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1097 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1098 pd->ctrl_iface = ctrl_intf;
1099
1100 } else {
1101 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1102 UAC_VERSION_3,
1103 iface_no);
1104
1105 pd = snd_usb_find_power_domain(ctrl_intf,
1106 as->bTerminalLink);
1107
1108 /* ok, let's parse further... */
1109 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1110 kfree(pd);
1111 audioformat_free(fp);
1112 return NULL;
1113 }
1114 }
1115
1116 if (pd)
1117 *pd_out = pd;
1118
1119 return fp;
1120 }
1121
__snd_usb_parse_audio_interface(struct snd_usb_audio * chip,int iface_no,bool * has_non_pcm,bool non_pcm)1122 static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1123 int iface_no,
1124 bool *has_non_pcm, bool non_pcm)
1125 {
1126 struct usb_device *dev;
1127 struct usb_interface *iface;
1128 struct usb_host_interface *alts;
1129 struct usb_interface_descriptor *altsd;
1130 int i, altno, err, stream;
1131 struct audioformat *fp = NULL;
1132 struct snd_usb_power_domain *pd = NULL;
1133 bool set_iface_first;
1134 int num, protocol;
1135
1136 dev = chip->dev;
1137
1138 /* parse the interface's altsettings */
1139 iface = usb_ifnum_to_if(dev, iface_no);
1140
1141 num = iface->num_altsetting;
1142
1143 /*
1144 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1145 * one misses syncpipe, and does not produce any sound.
1146 */
1147 if (chip->usb_id == USB_ID(0x04fa, 0x4201) && num >= 4)
1148 num = 4;
1149
1150 for (i = 0; i < num; i++) {
1151 alts = &iface->altsetting[i];
1152 altsd = get_iface_desc(alts);
1153 protocol = altsd->bInterfaceProtocol;
1154 /* skip invalid one */
1155 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1156 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1157 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1158 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1159 altsd->bNumEndpoints < 1 ||
1160 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1161 continue;
1162 /* must be isochronous */
1163 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1164 USB_ENDPOINT_XFER_ISOC)
1165 continue;
1166 /* check direction */
1167 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1168 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1169 altno = altsd->bAlternateSetting;
1170
1171 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1172 continue;
1173
1174 /*
1175 * Roland audio streaming interfaces are marked with protocols
1176 * 0/1/2, but are UAC 1 compatible.
1177 */
1178 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1179 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1180 protocol <= 2)
1181 protocol = UAC_VERSION_1;
1182
1183 switch (protocol) {
1184 default:
1185 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1186 iface_no, altno, protocol);
1187 protocol = UAC_VERSION_1;
1188 fallthrough;
1189 case UAC_VERSION_1:
1190 case UAC_VERSION_2: {
1191 int bm_quirk = 0;
1192
1193 /*
1194 * Blue Microphones workaround: The last altsetting is
1195 * identical with the previous one, except for a larger
1196 * packet size, but is actually a mislabeled two-channel
1197 * setting; ignore it.
1198 *
1199 * Part 1: prepare quirk flag
1200 */
1201 if (altno == 2 && num == 3 &&
1202 fp && fp->altsetting == 1 && fp->channels == 1 &&
1203 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1204 protocol == UAC_VERSION_1 &&
1205 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1206 fp->maxpacksize * 2)
1207 bm_quirk = 1;
1208
1209 fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1210 iface_no, i, altno,
1211 stream, bm_quirk);
1212 break;
1213 }
1214 case UAC_VERSION_3:
1215 fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1216 iface_no, i, altno, stream);
1217 break;
1218 }
1219
1220 if (!fp)
1221 continue;
1222 else if (IS_ERR(fp))
1223 return PTR_ERR(fp);
1224
1225 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1226 *has_non_pcm = true;
1227 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1228 audioformat_free(fp);
1229 kfree(pd);
1230 fp = NULL;
1231 pd = NULL;
1232 continue;
1233 }
1234
1235 snd_usb_audioformat_set_sync_ep(chip, fp);
1236
1237 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1238 if (protocol == UAC_VERSION_3)
1239 err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1240 else
1241 err = snd_usb_add_audio_stream(chip, stream, fp);
1242
1243 if (err < 0) {
1244 audioformat_free(fp);
1245 kfree(pd);
1246 return err;
1247 }
1248
1249 /* add endpoints */
1250 err = snd_usb_add_endpoint(chip, fp->endpoint,
1251 SND_USB_ENDPOINT_TYPE_DATA);
1252 if (err < 0)
1253 return err;
1254
1255 if (fp->sync_ep) {
1256 err = snd_usb_add_endpoint(chip, fp->sync_ep,
1257 fp->implicit_fb ?
1258 SND_USB_ENDPOINT_TYPE_DATA :
1259 SND_USB_ENDPOINT_TYPE_SYNC);
1260 if (err < 0)
1261 return err;
1262 }
1263
1264 set_iface_first = false;
1265 if (protocol == UAC_VERSION_1 ||
1266 (chip->quirk_flags & QUIRK_FLAG_SET_IFACE_FIRST))
1267 set_iface_first = true;
1268
1269 /* try to set the interface... */
1270 if (chip->quirk_flags & QUIRK_FLAG_SKIP_IFACE_SETUP)
1271 continue;
1272
1273 usb_set_interface(chip->dev, iface_no, 0);
1274 if (set_iface_first)
1275 usb_set_interface(chip->dev, iface_no, altno);
1276 snd_usb_init_pitch(chip, fp);
1277 snd_usb_init_sample_rate(chip, fp, fp->rate_max);
1278 if (!set_iface_first)
1279 usb_set_interface(chip->dev, iface_no, altno);
1280 }
1281 return 0;
1282 }
1283
snd_usb_parse_audio_interface(struct snd_usb_audio * chip,int iface_no)1284 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1285 {
1286 int err;
1287 bool has_non_pcm = false;
1288
1289 /* parse PCM formats */
1290 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1291 if (err < 0)
1292 return err;
1293
1294 if (has_non_pcm) {
1295 /* parse non-PCM formats */
1296 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1297 if (err < 0)
1298 return err;
1299 }
1300
1301 return 0;
1302 }
1303
1304