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->txfr_quirk;
93 subs->tx_length_quirk = as->chip->tx_length_quirk;
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_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 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(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
convert_chmap_v3(struct uac3_cluster_header_descriptor * cluster)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 */
__snd_usb_add_audio_stream(struct snd_usb_audio * chip,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)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 if (snd_device_get_state(chip->card, as->pcm) !=
506 SNDRV_DEV_BUILD)
507 chip->need_delayed_register = true;
508 err = snd_pcm_new_stream(as->pcm, stream, 1);
509 if (err < 0)
510 return err;
511 snd_usb_init_substream(as, stream, fp, pd);
512 return add_chmap(as->pcm, stream, subs);
513 }
514
515 /* create a new pcm */
516 as = kzalloc(sizeof(*as), GFP_KERNEL);
517 if (!as)
518 return -ENOMEM;
519 as->pcm_index = chip->pcm_devs;
520 as->chip = chip;
521 as->fmt_type = fp->fmt_type;
522 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
523 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
524 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
525 &pcm);
526 if (err < 0) {
527 kfree(as);
528 return err;
529 }
530 as->pcm = pcm;
531 pcm->private_data = as;
532 pcm->private_free = snd_usb_audio_pcm_free;
533 pcm->info_flags = 0;
534 if (chip->pcm_devs > 0)
535 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
536 else
537 strcpy(pcm->name, "USB Audio");
538
539 snd_usb_init_substream(as, stream, fp, pd);
540
541 /*
542 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
543 * fix to swap capture stream order in conf/cards/USB-audio.conf
544 */
545 if (chip->usb_id == USB_ID(0x0763, 0x2003))
546 list_add(&as->list, &chip->pcm_list);
547 else
548 list_add_tail(&as->list, &chip->pcm_list);
549
550 chip->pcm_devs++;
551
552 snd_usb_proc_pcm_format_add(as);
553
554 return add_chmap(pcm, stream, &as->substream[stream]);
555 }
556
snd_usb_add_audio_stream(struct snd_usb_audio * chip,int stream,struct audioformat * fp)557 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
558 int stream,
559 struct audioformat *fp)
560 {
561 return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
562 }
563
snd_usb_add_audio_stream_v3(struct snd_usb_audio * chip,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)564 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
565 int stream,
566 struct audioformat *fp,
567 struct snd_usb_power_domain *pd)
568 {
569 return __snd_usb_add_audio_stream(chip, stream, fp, pd);
570 }
571
parse_uac_endpoint_attributes(struct snd_usb_audio * chip,struct usb_host_interface * alts,int protocol,int iface_no)572 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
573 struct usb_host_interface *alts,
574 int protocol, int iface_no)
575 {
576 /* parsed with a v1 header here. that's ok as we only look at the
577 * header first which is the same for both versions */
578 struct uac_iso_endpoint_descriptor *csep;
579 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
580 int attributes = 0;
581
582 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
583
584 /* Creamware Noah has this descriptor after the 2nd endpoint */
585 if (!csep && altsd->bNumEndpoints >= 2)
586 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
587
588 /*
589 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
590 * bytes after the first endpoint, go search the entire interface.
591 * Some devices have it directly *before* the standard endpoint.
592 */
593 if (!csep)
594 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
595
596 if (!csep || csep->bLength < 7 ||
597 csep->bDescriptorSubtype != UAC_EP_GENERAL)
598 goto error;
599
600 if (protocol == UAC_VERSION_1) {
601 attributes = csep->bmAttributes;
602 } else if (protocol == UAC_VERSION_2) {
603 struct uac2_iso_endpoint_descriptor *csep2 =
604 (struct uac2_iso_endpoint_descriptor *) csep;
605
606 if (csep2->bLength < sizeof(*csep2))
607 goto error;
608 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
609
610 /* emulate the endpoint attributes of a v1 device */
611 if (csep2->bmControls & UAC2_CONTROL_PITCH)
612 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
613 } else { /* UAC_VERSION_3 */
614 struct uac3_iso_endpoint_descriptor *csep3 =
615 (struct uac3_iso_endpoint_descriptor *) csep;
616
617 if (csep3->bLength < sizeof(*csep3))
618 goto error;
619 /* emulate the endpoint attributes of a v1 device */
620 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
621 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
622 }
623
624 return attributes;
625
626 error:
627 usb_audio_warn(chip,
628 "%u:%d : no or invalid class specific endpoint descriptor\n",
629 iface_no, altsd->bAlternateSetting);
630 return 0;
631 }
632
633 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
634 * terminal id
635 */
636 static void *
snd_usb_find_input_terminal_descriptor(struct usb_host_interface * ctrl_iface,int terminal_id,int protocol)637 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
638 int terminal_id, int protocol)
639 {
640 struct uac2_input_terminal_descriptor *term = NULL;
641
642 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
643 ctrl_iface->extralen,
644 term, UAC_INPUT_TERMINAL))) {
645 if (!snd_usb_validate_audio_desc(term, protocol))
646 continue;
647 if (term->bTerminalID == terminal_id)
648 return term;
649 }
650
651 return NULL;
652 }
653
654 static void *
snd_usb_find_output_terminal_descriptor(struct usb_host_interface * ctrl_iface,int terminal_id,int protocol)655 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
656 int terminal_id, int protocol)
657 {
658 /* OK to use with both UAC2 and UAC3 */
659 struct uac2_output_terminal_descriptor *term = NULL;
660
661 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
662 ctrl_iface->extralen,
663 term, UAC_OUTPUT_TERMINAL))) {
664 if (!snd_usb_validate_audio_desc(term, protocol))
665 continue;
666 if (term->bTerminalID == terminal_id)
667 return term;
668 }
669
670 return NULL;
671 }
672
673 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)674 audio_format_alloc_init(struct snd_usb_audio *chip,
675 struct usb_host_interface *alts,
676 int protocol, int iface_no, int altset_idx,
677 int altno, int num_channels, int clock)
678 {
679 struct audioformat *fp;
680
681 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
682 if (!fp)
683 return NULL;
684
685 fp->iface = iface_no;
686 fp->altsetting = altno;
687 fp->altset_idx = altset_idx;
688 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
689 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
690 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
691 fp->protocol = protocol;
692 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
693 fp->channels = num_channels;
694 if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
695 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
696 * (fp->maxpacksize & 0x7ff);
697 fp->clock = clock;
698 INIT_LIST_HEAD(&fp->list);
699
700 return fp;
701 }
702
703 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)704 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
705 struct usb_host_interface *alts,
706 int protocol, int iface_no, int altset_idx,
707 int altno, int stream, int bm_quirk)
708 {
709 struct usb_device *dev = chip->dev;
710 struct uac_format_type_i_continuous_descriptor *fmt;
711 unsigned int num_channels = 0, chconfig = 0;
712 struct audioformat *fp;
713 int clock = 0;
714 u64 format;
715
716 /* get audio formats */
717 if (protocol == UAC_VERSION_1) {
718 struct uac1_as_header_descriptor *as =
719 snd_usb_find_csint_desc(alts->extra, alts->extralen,
720 NULL, UAC_AS_GENERAL);
721 struct uac_input_terminal_descriptor *iterm;
722
723 if (!as) {
724 dev_err(&dev->dev,
725 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
726 iface_no, altno);
727 return NULL;
728 }
729
730 if (as->bLength < sizeof(*as)) {
731 dev_err(&dev->dev,
732 "%u:%d : invalid UAC_AS_GENERAL desc\n",
733 iface_no, altno);
734 return NULL;
735 }
736
737 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
738
739 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
740 as->bTerminalLink,
741 protocol);
742 if (iterm) {
743 num_channels = iterm->bNrChannels;
744 chconfig = le16_to_cpu(iterm->wChannelConfig);
745 }
746 } else { /* UAC_VERSION_2 */
747 struct uac2_input_terminal_descriptor *input_term;
748 struct uac2_output_terminal_descriptor *output_term;
749 struct uac2_as_header_descriptor *as =
750 snd_usb_find_csint_desc(alts->extra, alts->extralen,
751 NULL, UAC_AS_GENERAL);
752
753 if (!as) {
754 dev_err(&dev->dev,
755 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
756 iface_no, altno);
757 return NULL;
758 }
759
760 if (as->bLength < sizeof(*as)) {
761 dev_err(&dev->dev,
762 "%u:%d : invalid UAC_AS_GENERAL desc\n",
763 iface_no, altno);
764 return NULL;
765 }
766
767 num_channels = as->bNrChannels;
768 format = le32_to_cpu(as->bmFormats);
769 chconfig = le32_to_cpu(as->bmChannelConfig);
770
771 /*
772 * lookup the terminal associated to this interface
773 * to extract the clock
774 */
775 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
776 as->bTerminalLink,
777 protocol);
778 if (input_term) {
779 clock = input_term->bCSourceID;
780 if (!chconfig && (num_channels == input_term->bNrChannels))
781 chconfig = le32_to_cpu(input_term->bmChannelConfig);
782 goto found_clock;
783 }
784
785 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
786 as->bTerminalLink,
787 protocol);
788 if (output_term) {
789 clock = output_term->bCSourceID;
790 goto found_clock;
791 }
792
793 dev_err(&dev->dev,
794 "%u:%d : bogus bTerminalLink %d\n",
795 iface_no, altno, as->bTerminalLink);
796 return NULL;
797 }
798
799 found_clock:
800 /* get format type */
801 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
802 NULL, UAC_FORMAT_TYPE);
803 if (!fmt) {
804 dev_err(&dev->dev,
805 "%u:%d : no UAC_FORMAT_TYPE desc\n",
806 iface_no, altno);
807 return NULL;
808 }
809 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
810 || ((protocol == UAC_VERSION_2) &&
811 (fmt->bLength < 6))) {
812 dev_err(&dev->dev,
813 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
814 iface_no, altno);
815 return NULL;
816 }
817
818 /*
819 * Blue Microphones workaround: The last altsetting is
820 * identical with the previous one, except for a larger
821 * packet size, but is actually a mislabeled two-channel
822 * setting; ignore it.
823 *
824 * Part 2: analyze quirk flag and format
825 */
826 if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
827 return NULL;
828
829 fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
830 altset_idx, altno, num_channels, clock);
831 if (!fp)
832 return ERR_PTR(-ENOMEM);
833
834 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
835 iface_no);
836
837 /* some quirks for attributes here */
838 snd_usb_audioformat_attributes_quirk(chip, fp, stream);
839
840 /* ok, let's parse further... */
841 if (snd_usb_parse_audio_format(chip, fp, format,
842 fmt, stream) < 0) {
843 audioformat_free(fp);
844 return NULL;
845 }
846
847 /* Create chmap */
848 if (fp->channels != num_channels)
849 chconfig = 0;
850
851 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
852
853 return fp;
854 }
855
856 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)857 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
858 struct usb_host_interface *alts,
859 struct snd_usb_power_domain **pd_out,
860 int iface_no, int altset_idx,
861 int altno, int stream)
862 {
863 struct usb_device *dev = chip->dev;
864 struct uac3_input_terminal_descriptor *input_term;
865 struct uac3_output_terminal_descriptor *output_term;
866 struct uac3_cluster_header_descriptor *cluster;
867 struct uac3_as_header_descriptor *as = NULL;
868 struct uac3_hc_descriptor_header hc_header;
869 struct snd_pcm_chmap_elem *chmap;
870 struct snd_usb_power_domain *pd;
871 unsigned char badd_profile;
872 u64 badd_formats = 0;
873 unsigned int num_channels;
874 struct audioformat *fp;
875 u16 cluster_id, wLength;
876 int clock = 0;
877 int err;
878
879 badd_profile = chip->badd_profile;
880
881 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
882 unsigned int maxpacksize =
883 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
884
885 switch (maxpacksize) {
886 default:
887 dev_err(&dev->dev,
888 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
889 iface_no, altno);
890 return NULL;
891 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
892 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
893 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
894 num_channels = 1;
895 break;
896 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
897 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
898 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
899 num_channels = 1;
900 break;
901 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
902 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
903 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
904 num_channels = 2;
905 break;
906 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
907 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
908 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
909 num_channels = 2;
910 break;
911 }
912
913 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
914 if (!chmap)
915 return ERR_PTR(-ENOMEM);
916
917 if (num_channels == 1) {
918 chmap->map[0] = SNDRV_CHMAP_MONO;
919 } else {
920 chmap->map[0] = SNDRV_CHMAP_FL;
921 chmap->map[1] = SNDRV_CHMAP_FR;
922 }
923
924 chmap->channels = num_channels;
925 clock = UAC3_BADD_CS_ID9;
926 goto found_clock;
927 }
928
929 as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
930 NULL, UAC_AS_GENERAL);
931 if (!as) {
932 dev_err(&dev->dev,
933 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
934 iface_no, altno);
935 return NULL;
936 }
937
938 if (as->bLength < sizeof(*as)) {
939 dev_err(&dev->dev,
940 "%u:%d : invalid UAC_AS_GENERAL desc\n",
941 iface_no, altno);
942 return NULL;
943 }
944
945 cluster_id = le16_to_cpu(as->wClusterDescrID);
946 if (!cluster_id) {
947 dev_err(&dev->dev,
948 "%u:%d : no cluster descriptor\n",
949 iface_no, altno);
950 return NULL;
951 }
952
953 /*
954 * Get number of channels and channel map through
955 * High Capability Cluster Descriptor
956 *
957 * First step: get High Capability header and
958 * read size of Cluster Descriptor
959 */
960 err = snd_usb_ctl_msg(chip->dev,
961 usb_rcvctrlpipe(chip->dev, 0),
962 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
963 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
964 cluster_id,
965 snd_usb_ctrl_intf(chip),
966 &hc_header, sizeof(hc_header));
967 if (err < 0)
968 return ERR_PTR(err);
969 else if (err != sizeof(hc_header)) {
970 dev_err(&dev->dev,
971 "%u:%d : can't get High Capability descriptor\n",
972 iface_no, altno);
973 return ERR_PTR(-EIO);
974 }
975
976 /*
977 * Second step: allocate needed amount of memory
978 * and request Cluster Descriptor
979 */
980 wLength = le16_to_cpu(hc_header.wLength);
981 cluster = kzalloc(wLength, GFP_KERNEL);
982 if (!cluster)
983 return ERR_PTR(-ENOMEM);
984 err = snd_usb_ctl_msg(chip->dev,
985 usb_rcvctrlpipe(chip->dev, 0),
986 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
987 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
988 cluster_id,
989 snd_usb_ctrl_intf(chip),
990 cluster, wLength);
991 if (err < 0) {
992 kfree(cluster);
993 return ERR_PTR(err);
994 } else if (err != wLength) {
995 dev_err(&dev->dev,
996 "%u:%d : can't get Cluster Descriptor\n",
997 iface_no, altno);
998 kfree(cluster);
999 return ERR_PTR(-EIO);
1000 }
1001
1002 num_channels = cluster->bNrChannels;
1003 chmap = convert_chmap_v3(cluster);
1004 kfree(cluster);
1005
1006 /*
1007 * lookup the terminal associated to this interface
1008 * to extract the clock
1009 */
1010 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1011 as->bTerminalLink,
1012 UAC_VERSION_3);
1013 if (input_term) {
1014 clock = input_term->bCSourceID;
1015 goto found_clock;
1016 }
1017
1018 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1019 as->bTerminalLink,
1020 UAC_VERSION_3);
1021 if (output_term) {
1022 clock = output_term->bCSourceID;
1023 goto found_clock;
1024 }
1025
1026 dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1027 iface_no, altno, as->bTerminalLink);
1028 kfree(chmap);
1029 return NULL;
1030
1031 found_clock:
1032 fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1033 altset_idx, altno, num_channels, clock);
1034 if (!fp) {
1035 kfree(chmap);
1036 return ERR_PTR(-ENOMEM);
1037 }
1038
1039 fp->chmap = chmap;
1040
1041 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1042 fp->attributes = 0; /* No attributes */
1043
1044 fp->fmt_type = UAC_FORMAT_TYPE_I;
1045 fp->formats = badd_formats;
1046
1047 fp->nr_rates = 0; /* SNDRV_PCM_RATE_CONTINUOUS */
1048 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1049 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1050 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1051
1052 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1053 if (!pd) {
1054 audioformat_free(fp);
1055 return NULL;
1056 }
1057 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1058 UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1059 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1060 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1061
1062 } else {
1063 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1064 UAC_VERSION_3,
1065 iface_no);
1066
1067 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1068 as->bTerminalLink);
1069
1070 /* ok, let's parse further... */
1071 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1072 kfree(pd);
1073 audioformat_free(fp);
1074 return NULL;
1075 }
1076 }
1077
1078 if (pd)
1079 *pd_out = pd;
1080
1081 return fp;
1082 }
1083
__snd_usb_parse_audio_interface(struct snd_usb_audio * chip,int iface_no,bool * has_non_pcm,bool non_pcm)1084 static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1085 int iface_no,
1086 bool *has_non_pcm, bool non_pcm)
1087 {
1088 struct usb_device *dev;
1089 struct usb_interface *iface;
1090 struct usb_host_interface *alts;
1091 struct usb_interface_descriptor *altsd;
1092 int i, altno, err, stream;
1093 struct audioformat *fp = NULL;
1094 struct snd_usb_power_domain *pd = NULL;
1095 int num, protocol;
1096
1097 dev = chip->dev;
1098
1099 /* parse the interface's altsettings */
1100 iface = usb_ifnum_to_if(dev, iface_no);
1101
1102 num = iface->num_altsetting;
1103
1104 /*
1105 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1106 * one misses syncpipe, and does not produce any sound.
1107 */
1108 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1109 num = 4;
1110
1111 for (i = 0; i < num; i++) {
1112 alts = &iface->altsetting[i];
1113 altsd = get_iface_desc(alts);
1114 protocol = altsd->bInterfaceProtocol;
1115 /* skip invalid one */
1116 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1117 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1118 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1119 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1120 altsd->bNumEndpoints < 1 ||
1121 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1122 continue;
1123 /* must be isochronous */
1124 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1125 USB_ENDPOINT_XFER_ISOC)
1126 continue;
1127 /* check direction */
1128 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1129 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1130 altno = altsd->bAlternateSetting;
1131
1132 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1133 continue;
1134
1135 /*
1136 * Roland audio streaming interfaces are marked with protocols
1137 * 0/1/2, but are UAC 1 compatible.
1138 */
1139 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1140 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1141 protocol <= 2)
1142 protocol = UAC_VERSION_1;
1143
1144 switch (protocol) {
1145 default:
1146 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1147 iface_no, altno, protocol);
1148 protocol = UAC_VERSION_1;
1149 fallthrough;
1150 case UAC_VERSION_1:
1151 case UAC_VERSION_2: {
1152 int bm_quirk = 0;
1153
1154 /*
1155 * Blue Microphones workaround: The last altsetting is
1156 * identical with the previous one, except for a larger
1157 * packet size, but is actually a mislabeled two-channel
1158 * setting; ignore it.
1159 *
1160 * Part 1: prepare quirk flag
1161 */
1162 if (altno == 2 && num == 3 &&
1163 fp && fp->altsetting == 1 && fp->channels == 1 &&
1164 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1165 protocol == UAC_VERSION_1 &&
1166 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1167 fp->maxpacksize * 2)
1168 bm_quirk = 1;
1169
1170 fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1171 iface_no, i, altno,
1172 stream, bm_quirk);
1173 break;
1174 }
1175 case UAC_VERSION_3:
1176 fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1177 iface_no, i, altno, stream);
1178 break;
1179 }
1180
1181 if (!fp)
1182 continue;
1183 else if (IS_ERR(fp))
1184 return PTR_ERR(fp);
1185
1186 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1187 *has_non_pcm = true;
1188 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1189 audioformat_free(fp);
1190 kfree(pd);
1191 fp = NULL;
1192 pd = NULL;
1193 continue;
1194 }
1195
1196 snd_usb_audioformat_set_sync_ep(chip, fp);
1197
1198 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1199 if (protocol == UAC_VERSION_3)
1200 err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1201 else
1202 err = snd_usb_add_audio_stream(chip, stream, fp);
1203
1204 if (err < 0) {
1205 audioformat_free(fp);
1206 kfree(pd);
1207 return err;
1208 }
1209
1210 /* add endpoints */
1211 err = snd_usb_add_endpoint(chip, fp->endpoint,
1212 SND_USB_ENDPOINT_TYPE_DATA);
1213 if (err < 0)
1214 return err;
1215
1216 if (fp->sync_ep) {
1217 err = snd_usb_add_endpoint(chip, fp->sync_ep,
1218 fp->implicit_fb ?
1219 SND_USB_ENDPOINT_TYPE_DATA :
1220 SND_USB_ENDPOINT_TYPE_SYNC);
1221 if (err < 0)
1222 return err;
1223 }
1224
1225 /* try to set the interface... */
1226 usb_set_interface(chip->dev, iface_no, 0);
1227 snd_usb_init_pitch(chip, fp);
1228 snd_usb_init_sample_rate(chip, fp, fp->rate_max);
1229 usb_set_interface(chip->dev, iface_no, altno);
1230 }
1231 return 0;
1232 }
1233
snd_usb_parse_audio_interface(struct snd_usb_audio * chip,int iface_no)1234 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1235 {
1236 int err;
1237 bool has_non_pcm = false;
1238
1239 /* parse PCM formats */
1240 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1241 if (err < 0)
1242 return err;
1243
1244 if (has_non_pcm) {
1245 /* parse non-PCM formats */
1246 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1247 if (err < 0)
1248 return err;
1249 }
1250
1251 return 0;
1252 }
1253
1254