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(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 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(sizeof(*chmap), GFP_KERNEL);
339 if (!chmap)
340 return NULL;
341
342 len = le16_to_cpu(cluster->wLength);
343 c = 0;
344 p += sizeof(struct uac3_cluster_header_descriptor);
345
346 while (((p - (void *)cluster) < len) && (c < channels)) {
347 struct uac3_cluster_segment_descriptor *cs_desc = p;
348 u16 cs_len;
349 u8 cs_type;
350
351 cs_len = le16_to_cpu(cs_desc->wLength);
352 cs_type = cs_desc->bSegmentType;
353
354 if (cs_type == UAC3_CHANNEL_INFORMATION) {
355 struct uac3_cluster_information_segment_descriptor *is = p;
356 unsigned char map;
357
358 /*
359 * TODO: this conversion is not complete, update it
360 * after adding UAC3 values to asound.h
361 */
362 switch (is->bChRelationship) {
363 case UAC3_CH_MONO:
364 map = SNDRV_CHMAP_MONO;
365 break;
366 case UAC3_CH_LEFT:
367 case UAC3_CH_FRONT_LEFT:
368 case UAC3_CH_HEADPHONE_LEFT:
369 map = SNDRV_CHMAP_FL;
370 break;
371 case UAC3_CH_RIGHT:
372 case UAC3_CH_FRONT_RIGHT:
373 case UAC3_CH_HEADPHONE_RIGHT:
374 map = SNDRV_CHMAP_FR;
375 break;
376 case UAC3_CH_FRONT_CENTER:
377 map = SNDRV_CHMAP_FC;
378 break;
379 case UAC3_CH_FRONT_LEFT_OF_CENTER:
380 map = SNDRV_CHMAP_FLC;
381 break;
382 case UAC3_CH_FRONT_RIGHT_OF_CENTER:
383 map = SNDRV_CHMAP_FRC;
384 break;
385 case UAC3_CH_SIDE_LEFT:
386 map = SNDRV_CHMAP_SL;
387 break;
388 case UAC3_CH_SIDE_RIGHT:
389 map = SNDRV_CHMAP_SR;
390 break;
391 case UAC3_CH_BACK_LEFT:
392 map = SNDRV_CHMAP_RL;
393 break;
394 case UAC3_CH_BACK_RIGHT:
395 map = SNDRV_CHMAP_RR;
396 break;
397 case UAC3_CH_BACK_CENTER:
398 map = SNDRV_CHMAP_RC;
399 break;
400 case UAC3_CH_BACK_LEFT_OF_CENTER:
401 map = SNDRV_CHMAP_RLC;
402 break;
403 case UAC3_CH_BACK_RIGHT_OF_CENTER:
404 map = SNDRV_CHMAP_RRC;
405 break;
406 case UAC3_CH_TOP_CENTER:
407 map = SNDRV_CHMAP_TC;
408 break;
409 case UAC3_CH_TOP_FRONT_LEFT:
410 map = SNDRV_CHMAP_TFL;
411 break;
412 case UAC3_CH_TOP_FRONT_RIGHT:
413 map = SNDRV_CHMAP_TFR;
414 break;
415 case UAC3_CH_TOP_FRONT_CENTER:
416 map = SNDRV_CHMAP_TFC;
417 break;
418 case UAC3_CH_TOP_FRONT_LOC:
419 map = SNDRV_CHMAP_TFLC;
420 break;
421 case UAC3_CH_TOP_FRONT_ROC:
422 map = SNDRV_CHMAP_TFRC;
423 break;
424 case UAC3_CH_TOP_SIDE_LEFT:
425 map = SNDRV_CHMAP_TSL;
426 break;
427 case UAC3_CH_TOP_SIDE_RIGHT:
428 map = SNDRV_CHMAP_TSR;
429 break;
430 case UAC3_CH_TOP_BACK_LEFT:
431 map = SNDRV_CHMAP_TRL;
432 break;
433 case UAC3_CH_TOP_BACK_RIGHT:
434 map = SNDRV_CHMAP_TRR;
435 break;
436 case UAC3_CH_TOP_BACK_CENTER:
437 map = SNDRV_CHMAP_TRC;
438 break;
439 case UAC3_CH_BOTTOM_CENTER:
440 map = SNDRV_CHMAP_BC;
441 break;
442 case UAC3_CH_LOW_FREQUENCY_EFFECTS:
443 map = SNDRV_CHMAP_LFE;
444 break;
445 case UAC3_CH_LFE_LEFT:
446 map = SNDRV_CHMAP_LLFE;
447 break;
448 case UAC3_CH_LFE_RIGHT:
449 map = SNDRV_CHMAP_RLFE;
450 break;
451 case UAC3_CH_RELATIONSHIP_UNDEFINED:
452 default:
453 map = SNDRV_CHMAP_UNKNOWN;
454 break;
455 }
456 chmap->map[c++] = map;
457 }
458 p += cs_len;
459 }
460
461 if (channels < c)
462 pr_err("%s: channel number mismatch\n", __func__);
463
464 chmap->channels = channels;
465
466 for (; c < channels; c++)
467 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
468
469 return chmap;
470 }
471
472 /*
473 * add this endpoint to the chip instance.
474 * if a stream with the same endpoint already exists, append to it.
475 * if not, create a new pcm stream. note, fp is added to the substream
476 * fmt_list and will be freed on the chip instance release. do not free
477 * fp or do remove it from the substream fmt_list to avoid double-free.
478 */
__snd_usb_add_audio_stream(struct snd_usb_audio * chip,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)479 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
480 int stream,
481 struct audioformat *fp,
482 struct snd_usb_power_domain *pd)
483
484 {
485 struct snd_usb_stream *as;
486 struct snd_usb_substream *subs;
487 struct snd_pcm *pcm;
488 int err;
489
490 list_for_each_entry(as, &chip->pcm_list, list) {
491 if (as->fmt_type != fp->fmt_type)
492 continue;
493 subs = &as->substream[stream];
494 if (subs->ep_num == fp->endpoint) {
495 list_add_tail(&fp->list, &subs->fmt_list);
496 subs->num_formats++;
497 subs->formats |= fp->formats;
498 return 0;
499 }
500 }
501
502 if (chip->card->registered)
503 chip->need_delayed_register = true;
504
505 /* look for an empty stream */
506 list_for_each_entry(as, &chip->pcm_list, list) {
507 if (as->fmt_type != fp->fmt_type)
508 continue;
509 subs = &as->substream[stream];
510 if (subs->ep_num)
511 continue;
512 err = snd_pcm_new_stream(as->pcm, stream, 1);
513 if (err < 0)
514 return err;
515 snd_usb_init_substream(as, stream, fp, pd);
516 return add_chmap(as->pcm, stream, subs);
517 }
518
519 /* create a new pcm */
520 as = kzalloc(sizeof(*as), GFP_KERNEL);
521 if (!as)
522 return -ENOMEM;
523 as->pcm_index = chip->pcm_devs;
524 as->chip = chip;
525 as->fmt_type = fp->fmt_type;
526 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
527 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
528 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
529 &pcm);
530 if (err < 0) {
531 kfree(as);
532 return err;
533 }
534 as->pcm = pcm;
535 pcm->private_data = as;
536 pcm->private_free = snd_usb_audio_pcm_free;
537 pcm->info_flags = 0;
538 if (chip->pcm_devs > 0)
539 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
540 else
541 strcpy(pcm->name, "USB Audio");
542
543 snd_usb_init_substream(as, stream, fp, pd);
544
545 /*
546 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
547 * fix to swap capture stream order in conf/cards/USB-audio.conf
548 */
549 if (chip->usb_id == USB_ID(0x0763, 0x2003))
550 list_add(&as->list, &chip->pcm_list);
551 else
552 list_add_tail(&as->list, &chip->pcm_list);
553
554 chip->pcm_devs++;
555
556 snd_usb_proc_pcm_format_add(as);
557
558 return add_chmap(pcm, stream, &as->substream[stream]);
559 }
560
snd_usb_add_audio_stream(struct snd_usb_audio * chip,int stream,struct audioformat * fp)561 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
562 int stream,
563 struct audioformat *fp)
564 {
565 return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
566 }
567
snd_usb_add_audio_stream_v3(struct snd_usb_audio * chip,int stream,struct audioformat * fp,struct snd_usb_power_domain * pd)568 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
569 int stream,
570 struct audioformat *fp,
571 struct snd_usb_power_domain *pd)
572 {
573 return __snd_usb_add_audio_stream(chip, stream, fp, pd);
574 }
575
parse_uac_endpoint_attributes(struct snd_usb_audio * chip,struct usb_host_interface * alts,int protocol,int iface_no)576 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
577 struct usb_host_interface *alts,
578 int protocol, int iface_no)
579 {
580 /* parsed with a v1 header here. that's ok as we only look at the
581 * header first which is the same for both versions */
582 struct uac_iso_endpoint_descriptor *csep;
583 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
584 int attributes = 0;
585
586 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
587
588 /* Creamware Noah has this descriptor after the 2nd endpoint */
589 if (!csep && altsd->bNumEndpoints >= 2)
590 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
591
592 /*
593 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
594 * bytes after the first endpoint, go search the entire interface.
595 * Some devices have it directly *before* the standard endpoint.
596 */
597 if (!csep)
598 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
599
600 if (!csep || csep->bLength < 7 ||
601 csep->bDescriptorSubtype != UAC_EP_GENERAL)
602 goto error;
603
604 if (protocol == UAC_VERSION_1) {
605 attributes = csep->bmAttributes;
606 } else if (protocol == UAC_VERSION_2) {
607 struct uac2_iso_endpoint_descriptor *csep2 =
608 (struct uac2_iso_endpoint_descriptor *) csep;
609
610 if (csep2->bLength < sizeof(*csep2))
611 goto error;
612 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
613
614 /* emulate the endpoint attributes of a v1 device */
615 if (csep2->bmControls & UAC2_CONTROL_PITCH)
616 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
617 } else { /* UAC_VERSION_3 */
618 struct uac3_iso_endpoint_descriptor *csep3 =
619 (struct uac3_iso_endpoint_descriptor *) csep;
620
621 if (csep3->bLength < sizeof(*csep3))
622 goto error;
623 /* emulate the endpoint attributes of a v1 device */
624 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
625 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
626 }
627
628 return attributes;
629
630 error:
631 usb_audio_warn(chip,
632 "%u:%d : no or invalid class specific endpoint descriptor\n",
633 iface_no, altsd->bAlternateSetting);
634 return 0;
635 }
636
637 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
638 * terminal id
639 */
640 static void *
snd_usb_find_input_terminal_descriptor(struct usb_host_interface * ctrl_iface,int terminal_id,int protocol)641 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
642 int terminal_id, int protocol)
643 {
644 struct uac2_input_terminal_descriptor *term = NULL;
645
646 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
647 ctrl_iface->extralen,
648 term, UAC_INPUT_TERMINAL))) {
649 if (!snd_usb_validate_audio_desc(term, protocol))
650 continue;
651 if (term->bTerminalID == terminal_id)
652 return term;
653 }
654
655 return NULL;
656 }
657
658 static void *
snd_usb_find_output_terminal_descriptor(struct usb_host_interface * ctrl_iface,int terminal_id,int protocol)659 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
660 int terminal_id, int protocol)
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 (!snd_usb_validate_audio_desc(term, protocol))
669 continue;
670 if (term->bTerminalID == terminal_id)
671 return term;
672 }
673
674 return NULL;
675 }
676
677 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)678 audio_format_alloc_init(struct snd_usb_audio *chip,
679 struct usb_host_interface *alts,
680 int protocol, int iface_no, int altset_idx,
681 int altno, int num_channels, int clock)
682 {
683 struct audioformat *fp;
684
685 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
686 if (!fp)
687 return NULL;
688
689 fp->iface = iface_no;
690 fp->altsetting = altno;
691 fp->altset_idx = altset_idx;
692 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
693 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
694 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
695 fp->protocol = protocol;
696 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
697 fp->channels = num_channels;
698 if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
699 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
700 * (fp->maxpacksize & 0x7ff);
701 fp->clock = clock;
702 INIT_LIST_HEAD(&fp->list);
703
704 return fp;
705 }
706
707 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)708 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
709 struct usb_host_interface *alts,
710 int protocol, int iface_no, int altset_idx,
711 int altno, int stream, int bm_quirk)
712 {
713 struct usb_device *dev = chip->dev;
714 struct uac_format_type_i_continuous_descriptor *fmt;
715 unsigned int num_channels = 0, chconfig = 0;
716 struct usb_host_interface *ctrl_intf;
717 struct audioformat *fp;
718 int clock = 0;
719 u64 format;
720
721 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
722
723 /* get audio formats */
724 if (protocol == UAC_VERSION_1) {
725 struct uac1_as_header_descriptor *as =
726 snd_usb_find_csint_desc(alts->extra, alts->extralen,
727 NULL, UAC_AS_GENERAL);
728 struct uac_input_terminal_descriptor *iterm;
729
730 if (!as) {
731 dev_err(&dev->dev,
732 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
733 iface_no, altno);
734 return NULL;
735 }
736
737 if (as->bLength < sizeof(*as)) {
738 dev_err(&dev->dev,
739 "%u:%d : invalid UAC_AS_GENERAL desc\n",
740 iface_no, altno);
741 return NULL;
742 }
743
744 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
745
746 iterm = snd_usb_find_input_terminal_descriptor(ctrl_intf,
747 as->bTerminalLink,
748 protocol);
749 if (iterm) {
750 num_channels = iterm->bNrChannels;
751 chconfig = le16_to_cpu(iterm->wChannelConfig);
752 }
753 } else { /* UAC_VERSION_2 */
754 struct uac2_input_terminal_descriptor *input_term;
755 struct uac2_output_terminal_descriptor *output_term;
756 struct uac2_as_header_descriptor *as =
757 snd_usb_find_csint_desc(alts->extra, alts->extralen,
758 NULL, UAC_AS_GENERAL);
759
760 if (!as) {
761 dev_err(&dev->dev,
762 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
763 iface_no, altno);
764 return NULL;
765 }
766
767 if (as->bLength < sizeof(*as)) {
768 dev_err(&dev->dev,
769 "%u:%d : invalid UAC_AS_GENERAL desc\n",
770 iface_no, altno);
771 return NULL;
772 }
773
774 num_channels = as->bNrChannels;
775 format = le32_to_cpu(as->bmFormats);
776 chconfig = le32_to_cpu(as->bmChannelConfig);
777
778 /*
779 * lookup the terminal associated to this interface
780 * to extract the clock
781 */
782 input_term = snd_usb_find_input_terminal_descriptor(ctrl_intf,
783 as->bTerminalLink,
784 protocol);
785 if (input_term) {
786 clock = input_term->bCSourceID;
787 if (!chconfig && (num_channels == input_term->bNrChannels))
788 chconfig = le32_to_cpu(input_term->bmChannelConfig);
789 goto found_clock;
790 }
791
792 output_term = snd_usb_find_output_terminal_descriptor(ctrl_intf,
793 as->bTerminalLink,
794 protocol);
795 if (output_term) {
796 clock = output_term->bCSourceID;
797 goto found_clock;
798 }
799
800 dev_err(&dev->dev,
801 "%u:%d : bogus bTerminalLink %d\n",
802 iface_no, altno, as->bTerminalLink);
803 return NULL;
804 }
805
806 found_clock:
807 /* get format type */
808 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
809 NULL, UAC_FORMAT_TYPE);
810 if (!fmt) {
811 dev_err(&dev->dev,
812 "%u:%d : no UAC_FORMAT_TYPE desc\n",
813 iface_no, altno);
814 return NULL;
815 }
816 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
817 || ((protocol == UAC_VERSION_2) &&
818 (fmt->bLength < 6))) {
819 dev_err(&dev->dev,
820 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
821 iface_no, altno);
822 return NULL;
823 }
824
825 /*
826 * Blue Microphones workaround: The last altsetting is
827 * identical with the previous one, except for a larger
828 * packet size, but is actually a mislabeled two-channel
829 * setting; ignore it.
830 *
831 * Part 2: analyze quirk flag and format
832 */
833 if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
834 return NULL;
835
836 fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
837 altset_idx, altno, num_channels, clock);
838 if (!fp)
839 return ERR_PTR(-ENOMEM);
840
841 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
842 iface_no);
843
844 /* some quirks for attributes here */
845 snd_usb_audioformat_attributes_quirk(chip, fp, stream);
846
847 /* ok, let's parse further... */
848 if (snd_usb_parse_audio_format(chip, fp, format,
849 fmt, stream) < 0) {
850 audioformat_free(fp);
851 return NULL;
852 }
853
854 /* Create chmap */
855 if (fp->channels != num_channels)
856 chconfig = 0;
857
858 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
859
860 return fp;
861 }
862
863 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)864 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
865 struct usb_host_interface *alts,
866 struct snd_usb_power_domain **pd_out,
867 int iface_no, int altset_idx,
868 int altno, int stream)
869 {
870 struct usb_device *dev = chip->dev;
871 struct uac3_input_terminal_descriptor *input_term;
872 struct uac3_output_terminal_descriptor *output_term;
873 struct uac3_cluster_header_descriptor *cluster;
874 struct uac3_as_header_descriptor *as = NULL;
875 struct uac3_hc_descriptor_header hc_header;
876 struct usb_host_interface *ctrl_intf;
877 struct snd_pcm_chmap_elem *chmap;
878 struct snd_usb_power_domain *pd;
879 unsigned char badd_profile;
880 u64 badd_formats = 0;
881 unsigned int num_channels;
882 struct audioformat *fp;
883 u16 cluster_id, wLength;
884 int clock = 0;
885 int err;
886
887 badd_profile = chip->badd_profile;
888 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
889
890 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
891 unsigned int maxpacksize =
892 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
893
894 switch (maxpacksize) {
895 default:
896 dev_err(&dev->dev,
897 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
898 iface_no, altno);
899 return NULL;
900 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
901 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
902 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
903 num_channels = 1;
904 break;
905 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
906 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
907 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
908 num_channels = 1;
909 break;
910 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
911 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
912 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
913 num_channels = 2;
914 break;
915 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
916 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
917 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
918 num_channels = 2;
919 break;
920 }
921
922 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
923 if (!chmap)
924 return ERR_PTR(-ENOMEM);
925
926 if (num_channels == 1) {
927 chmap->map[0] = SNDRV_CHMAP_MONO;
928 } else {
929 chmap->map[0] = SNDRV_CHMAP_FL;
930 chmap->map[1] = SNDRV_CHMAP_FR;
931 }
932
933 chmap->channels = num_channels;
934 clock = UAC3_BADD_CS_ID9;
935 goto found_clock;
936 }
937
938 as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
939 NULL, UAC_AS_GENERAL);
940 if (!as) {
941 dev_err(&dev->dev,
942 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
943 iface_no, altno);
944 return NULL;
945 }
946
947 if (as->bLength < sizeof(*as)) {
948 dev_err(&dev->dev,
949 "%u:%d : invalid UAC_AS_GENERAL desc\n",
950 iface_no, altno);
951 return NULL;
952 }
953
954 cluster_id = le16_to_cpu(as->wClusterDescrID);
955 if (!cluster_id) {
956 dev_err(&dev->dev,
957 "%u:%d : no cluster descriptor\n",
958 iface_no, altno);
959 return NULL;
960 }
961
962 /*
963 * Get number of channels and channel map through
964 * High Capability Cluster Descriptor
965 *
966 * First step: get High Capability header and
967 * read size of Cluster Descriptor
968 */
969 err = snd_usb_ctl_msg(chip->dev,
970 usb_rcvctrlpipe(chip->dev, 0),
971 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
972 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
973 cluster_id,
974 snd_usb_ctrl_intf(ctrl_intf),
975 &hc_header, sizeof(hc_header));
976 if (err < 0)
977 return ERR_PTR(err);
978 else if (err != sizeof(hc_header)) {
979 dev_err(&dev->dev,
980 "%u:%d : can't get High Capability descriptor\n",
981 iface_no, altno);
982 return ERR_PTR(-EIO);
983 }
984
985 /*
986 * Second step: allocate needed amount of memory
987 * and request Cluster Descriptor
988 */
989 wLength = le16_to_cpu(hc_header.wLength);
990 cluster = kzalloc(wLength, GFP_KERNEL);
991 if (!cluster)
992 return ERR_PTR(-ENOMEM);
993 err = snd_usb_ctl_msg(chip->dev,
994 usb_rcvctrlpipe(chip->dev, 0),
995 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
996 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
997 cluster_id,
998 snd_usb_ctrl_intf(ctrl_intf),
999 cluster, wLength);
1000 if (err < 0) {
1001 kfree(cluster);
1002 return ERR_PTR(err);
1003 } else if (err != wLength) {
1004 dev_err(&dev->dev,
1005 "%u:%d : can't get Cluster Descriptor\n",
1006 iface_no, altno);
1007 kfree(cluster);
1008 return ERR_PTR(-EIO);
1009 }
1010
1011 num_channels = cluster->bNrChannels;
1012 chmap = convert_chmap_v3(cluster);
1013 kfree(cluster);
1014
1015 /*
1016 * lookup the terminal associated to this interface
1017 * to extract the clock
1018 */
1019 input_term = snd_usb_find_input_terminal_descriptor(ctrl_intf,
1020 as->bTerminalLink,
1021 UAC_VERSION_3);
1022 if (input_term) {
1023 clock = input_term->bCSourceID;
1024 goto found_clock;
1025 }
1026
1027 output_term = snd_usb_find_output_terminal_descriptor(ctrl_intf,
1028 as->bTerminalLink,
1029 UAC_VERSION_3);
1030 if (output_term) {
1031 clock = output_term->bCSourceID;
1032 goto found_clock;
1033 }
1034
1035 dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1036 iface_no, altno, as->bTerminalLink);
1037 kfree(chmap);
1038 return NULL;
1039
1040 found_clock:
1041 fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1042 altset_idx, altno, num_channels, clock);
1043 if (!fp) {
1044 kfree(chmap);
1045 return ERR_PTR(-ENOMEM);
1046 }
1047
1048 fp->chmap = chmap;
1049
1050 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1051 fp->attributes = 0; /* No attributes */
1052
1053 fp->fmt_type = UAC_FORMAT_TYPE_I;
1054 fp->formats = badd_formats;
1055
1056 fp->nr_rates = 0; /* SNDRV_PCM_RATE_CONTINUOUS */
1057 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1058 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1059 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1060
1061 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1062 if (!pd) {
1063 audioformat_free(fp);
1064 return NULL;
1065 }
1066 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1067 UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1068 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1069 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1070 pd->ctrl_iface = ctrl_intf;
1071
1072 } else {
1073 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1074 UAC_VERSION_3,
1075 iface_no);
1076
1077 pd = snd_usb_find_power_domain(ctrl_intf,
1078 as->bTerminalLink);
1079
1080 /* ok, let's parse further... */
1081 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1082 kfree(pd);
1083 audioformat_free(fp);
1084 return NULL;
1085 }
1086 }
1087
1088 if (pd)
1089 *pd_out = pd;
1090
1091 return fp;
1092 }
1093
__snd_usb_parse_audio_interface(struct snd_usb_audio * chip,int iface_no,bool * has_non_pcm,bool non_pcm)1094 static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1095 int iface_no,
1096 bool *has_non_pcm, bool non_pcm)
1097 {
1098 struct usb_device *dev;
1099 struct usb_interface *iface;
1100 struct usb_host_interface *alts;
1101 struct usb_interface_descriptor *altsd;
1102 int i, altno, err, stream;
1103 struct audioformat *fp = NULL;
1104 struct snd_usb_power_domain *pd = NULL;
1105 bool set_iface_first;
1106 int num, protocol;
1107
1108 dev = chip->dev;
1109
1110 /* parse the interface's altsettings */
1111 iface = usb_ifnum_to_if(dev, iface_no);
1112
1113 num = iface->num_altsetting;
1114
1115 /*
1116 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1117 * one misses syncpipe, and does not produce any sound.
1118 */
1119 if (chip->usb_id == USB_ID(0x04fa, 0x4201) && num >= 4)
1120 num = 4;
1121
1122 for (i = 0; i < num; i++) {
1123 alts = &iface->altsetting[i];
1124 altsd = get_iface_desc(alts);
1125 protocol = altsd->bInterfaceProtocol;
1126 /* skip invalid one */
1127 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1128 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1129 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1130 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1131 altsd->bNumEndpoints < 1 ||
1132 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1133 continue;
1134 /* must be isochronous */
1135 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1136 USB_ENDPOINT_XFER_ISOC)
1137 continue;
1138 /* check direction */
1139 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1140 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1141 altno = altsd->bAlternateSetting;
1142
1143 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1144 continue;
1145
1146 /*
1147 * Roland audio streaming interfaces are marked with protocols
1148 * 0/1/2, but are UAC 1 compatible.
1149 */
1150 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1151 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1152 protocol <= 2)
1153 protocol = UAC_VERSION_1;
1154
1155 switch (protocol) {
1156 default:
1157 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1158 iface_no, altno, protocol);
1159 protocol = UAC_VERSION_1;
1160 fallthrough;
1161 case UAC_VERSION_1:
1162 case UAC_VERSION_2: {
1163 int bm_quirk = 0;
1164
1165 /*
1166 * Blue Microphones workaround: The last altsetting is
1167 * identical with the previous one, except for a larger
1168 * packet size, but is actually a mislabeled two-channel
1169 * setting; ignore it.
1170 *
1171 * Part 1: prepare quirk flag
1172 */
1173 if (altno == 2 && num == 3 &&
1174 fp && fp->altsetting == 1 && fp->channels == 1 &&
1175 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1176 protocol == UAC_VERSION_1 &&
1177 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1178 fp->maxpacksize * 2)
1179 bm_quirk = 1;
1180
1181 fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1182 iface_no, i, altno,
1183 stream, bm_quirk);
1184 break;
1185 }
1186 case UAC_VERSION_3:
1187 fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1188 iface_no, i, altno, stream);
1189 break;
1190 }
1191
1192 if (!fp)
1193 continue;
1194 else if (IS_ERR(fp))
1195 return PTR_ERR(fp);
1196
1197 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1198 *has_non_pcm = true;
1199 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1200 audioformat_free(fp);
1201 kfree(pd);
1202 fp = NULL;
1203 pd = NULL;
1204 continue;
1205 }
1206
1207 snd_usb_audioformat_set_sync_ep(chip, fp);
1208
1209 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1210 if (protocol == UAC_VERSION_3)
1211 err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1212 else
1213 err = snd_usb_add_audio_stream(chip, stream, fp);
1214
1215 if (err < 0) {
1216 audioformat_free(fp);
1217 kfree(pd);
1218 return err;
1219 }
1220
1221 /* add endpoints */
1222 err = snd_usb_add_endpoint(chip, fp->endpoint,
1223 SND_USB_ENDPOINT_TYPE_DATA);
1224 if (err < 0)
1225 return err;
1226
1227 if (fp->sync_ep) {
1228 err = snd_usb_add_endpoint(chip, fp->sync_ep,
1229 fp->implicit_fb ?
1230 SND_USB_ENDPOINT_TYPE_DATA :
1231 SND_USB_ENDPOINT_TYPE_SYNC);
1232 if (err < 0)
1233 return err;
1234 }
1235
1236 set_iface_first = false;
1237 if (protocol == UAC_VERSION_1 ||
1238 (chip->quirk_flags & QUIRK_FLAG_SET_IFACE_FIRST))
1239 set_iface_first = true;
1240
1241 /* try to set the interface... */
1242 usb_set_interface(chip->dev, iface_no, 0);
1243 if (set_iface_first)
1244 usb_set_interface(chip->dev, iface_no, altno);
1245 snd_usb_init_pitch(chip, fp);
1246 snd_usb_init_sample_rate(chip, fp, fp->rate_max);
1247 if (!set_iface_first)
1248 usb_set_interface(chip->dev, iface_no, altno);
1249 }
1250 return 0;
1251 }
1252
snd_usb_parse_audio_interface(struct snd_usb_audio * chip,int iface_no)1253 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1254 {
1255 int err;
1256 bool has_non_pcm = false;
1257
1258 /* parse PCM formats */
1259 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1260 if (err < 0)
1261 return err;
1262
1263 if (has_non_pcm) {
1264 /* parse non-PCM formats */
1265 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1266 if (err < 0)
1267 return err;
1268 }
1269
1270 return 0;
1271 }
1272
1273