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1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/usb.h>
21#include <linux/usb/audio.h>
22#include <linux/usb/audio-v2.h>
23
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/control.h>
27#include <sound/tlv.h>
28
29#include "usbaudio.h"
30#include "card.h"
31#include "proc.h"
32#include "quirks.h"
33#include "endpoint.h"
34#include "pcm.h"
35#include "helper.h"
36#include "format.h"
37#include "clock.h"
38#include "stream.h"
39
40/*
41 * free a substream
42 */
43static void free_substream(struct snd_usb_substream *subs)
44{
45 struct audioformat *fp, *n;
46
47 if (!subs->num_formats)
48 return; /* not initialized */
49 list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
50 kfree(fp->rate_table);
51 kfree(fp->chmap);
52 kfree(fp);
53 }
54 kfree(subs->rate_list.list);
55}
56
57
58/*
59 * free a usb stream instance
60 */
61static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
62{
63 free_substream(&stream->substream[0]);
64 free_substream(&stream->substream[1]);
65 list_del(&stream->list);
66 kfree(stream);
67}
68
69static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
70{
71 struct snd_usb_stream *stream = pcm->private_data;
72 if (stream) {
73 stream->pcm = NULL;
74 snd_usb_audio_stream_free(stream);
75 }
76}
77
78/*
79 * initialize the substream instance.
80 */
81
82static void snd_usb_init_substream(struct snd_usb_stream *as,
83 int stream,
84 struct audioformat *fp)
85{
86 struct snd_usb_substream *subs = &as->substream[stream];
87
88 INIT_LIST_HEAD(&subs->fmt_list);
89 spin_lock_init(&subs->lock);
90
91 subs->stream = as;
92 subs->direction = stream;
93 subs->dev = as->chip->dev;
94 subs->txfr_quirk = as->chip->txfr_quirk;
95 subs->speed = snd_usb_get_speed(subs->dev);
96 subs->pkt_offset_adj = 0;
97
98 snd_usb_set_pcm_ops(as->pcm, stream);
99
100 list_add_tail(&fp->list, &subs->fmt_list);
101 subs->formats |= fp->formats;
102 subs->num_formats++;
103 subs->fmt_type = fp->fmt_type;
104 subs->ep_num = fp->endpoint;
105 if (fp->channels > subs->channels_max)
106 subs->channels_max = fp->channels;
107}
108
109/* kctl callbacks for usb-audio channel maps */
110static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
111 struct snd_ctl_elem_info *uinfo)
112{
113 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
114 struct snd_usb_substream *subs = info->private_data;
115
116 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
117 uinfo->count = subs->channels_max;
118 uinfo->value.integer.min = 0;
119 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
120 return 0;
121}
122
123/* check whether a duplicated entry exists in the audiofmt list */
124static bool have_dup_chmap(struct snd_usb_substream *subs,
125 struct audioformat *fp)
126{
127 struct list_head *p;
128
129 for (p = fp->list.prev; p != &subs->fmt_list; p = p->prev) {
130 struct audioformat *prev;
131 prev = list_entry(p, struct audioformat, list);
132 if (prev->chmap &&
133 !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
134 return true;
135 }
136 return false;
137}
138
139static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
140 unsigned int size, unsigned int __user *tlv)
141{
142 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
143 struct snd_usb_substream *subs = info->private_data;
144 struct audioformat *fp;
145 unsigned int __user *dst;
146 int count = 0;
147
148 if (size < 8)
149 return -ENOMEM;
150 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
151 return -EFAULT;
152 size -= 8;
153 dst = tlv + 2;
154 list_for_each_entry(fp, &subs->fmt_list, list) {
155 int i, ch_bytes;
156
157 if (!fp->chmap)
158 continue;
159 if (have_dup_chmap(subs, fp))
160 continue;
161 /* copy the entry */
162 ch_bytes = fp->chmap->channels * 4;
163 if (size < 8 + ch_bytes)
164 return -ENOMEM;
165 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
166 put_user(ch_bytes, dst + 1))
167 return -EFAULT;
168 dst += 2;
169 for (i = 0; i < fp->chmap->channels; i++, dst++) {
170 if (put_user(fp->chmap->map[i], dst))
171 return -EFAULT;
172 }
173
174 count += 8 + ch_bytes;
175 size -= 8 + ch_bytes;
176 }
177 if (put_user(count, tlv + 1))
178 return -EFAULT;
179 return 0;
180}
181
182static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
183 struct snd_ctl_elem_value *ucontrol)
184{
185 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
186 struct snd_usb_substream *subs = info->private_data;
187 struct snd_pcm_chmap_elem *chmap = NULL;
188 int i;
189
190 memset(ucontrol->value.integer.value, 0,
191 sizeof(ucontrol->value.integer.value));
192 if (subs->cur_audiofmt)
193 chmap = subs->cur_audiofmt->chmap;
194 if (chmap) {
195 for (i = 0; i < chmap->channels; i++)
196 ucontrol->value.integer.value[i] = chmap->map[i];
197 }
198 return 0;
199}
200
201/* create a chmap kctl assigned to the given USB substream */
202static int add_chmap(struct snd_pcm *pcm, int stream,
203 struct snd_usb_substream *subs)
204{
205 struct audioformat *fp;
206 struct snd_pcm_chmap *chmap;
207 struct snd_kcontrol *kctl;
208 int err;
209
210 list_for_each_entry(fp, &subs->fmt_list, list)
211 if (fp->chmap)
212 goto ok;
213 /* no chmap is found */
214 return 0;
215
216 ok:
217 err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
218 if (err < 0)
219 return err;
220
221 /* override handlers */
222 chmap->private_data = subs;
223 kctl = chmap->kctl;
224 kctl->info = usb_chmap_ctl_info;
225 kctl->get = usb_chmap_ctl_get;
226 kctl->tlv.c = usb_chmap_ctl_tlv;
227
228 return 0;
229}
230
231/* convert from USB ChannelConfig bits to ALSA chmap element */
232static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
233 int protocol)
234{
235 static unsigned int uac1_maps[] = {
236 SNDRV_CHMAP_FL, /* left front */
237 SNDRV_CHMAP_FR, /* right front */
238 SNDRV_CHMAP_FC, /* center front */
239 SNDRV_CHMAP_LFE, /* LFE */
240 SNDRV_CHMAP_SL, /* left surround */
241 SNDRV_CHMAP_SR, /* right surround */
242 SNDRV_CHMAP_FLC, /* left of center */
243 SNDRV_CHMAP_FRC, /* right of center */
244 SNDRV_CHMAP_RC, /* surround */
245 SNDRV_CHMAP_SL, /* side left */
246 SNDRV_CHMAP_SR, /* side right */
247 SNDRV_CHMAP_TC, /* top */
248 0 /* terminator */
249 };
250 static unsigned int uac2_maps[] = {
251 SNDRV_CHMAP_FL, /* front left */
252 SNDRV_CHMAP_FR, /* front right */
253 SNDRV_CHMAP_FC, /* front center */
254 SNDRV_CHMAP_LFE, /* LFE */
255 SNDRV_CHMAP_RL, /* back left */
256 SNDRV_CHMAP_RR, /* back right */
257 SNDRV_CHMAP_FLC, /* front left of center */
258 SNDRV_CHMAP_FRC, /* front right of center */
259 SNDRV_CHMAP_RC, /* back center */
260 SNDRV_CHMAP_SL, /* side left */
261 SNDRV_CHMAP_SR, /* side right */
262 SNDRV_CHMAP_TC, /* top center */
263 SNDRV_CHMAP_TFL, /* top front left */
264 SNDRV_CHMAP_TFC, /* top front center */
265 SNDRV_CHMAP_TFR, /* top front right */
266 SNDRV_CHMAP_TRL, /* top back left */
267 SNDRV_CHMAP_TRC, /* top back center */
268 SNDRV_CHMAP_TRR, /* top back right */
269 SNDRV_CHMAP_TFLC, /* top front left of center */
270 SNDRV_CHMAP_TFRC, /* top front right of center */
271 SNDRV_CHMAP_LLFE, /* left LFE */
272 SNDRV_CHMAP_RLFE, /* right LFE */
273 SNDRV_CHMAP_TSL, /* top side left */
274 SNDRV_CHMAP_TSR, /* top side right */
275 SNDRV_CHMAP_BC, /* bottom center */
276 SNDRV_CHMAP_RLC, /* back left of center */
277 SNDRV_CHMAP_RRC, /* back right of center */
278 0 /* terminator */
279 };
280 struct snd_pcm_chmap_elem *chmap;
281 const unsigned int *maps;
282 int c;
283
284 if (channels > ARRAY_SIZE(chmap->map))
285 return NULL;
286
287 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
288 if (!chmap)
289 return NULL;
290
291 maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
292 chmap->channels = channels;
293 c = 0;
294
295 if (bits) {
296 for (; bits && *maps; maps++, bits >>= 1)
297 if (bits & 1)
298 chmap->map[c++] = *maps;
299 } else {
300 /* If we're missing wChannelConfig, then guess something
301 to make sure the channel map is not skipped entirely */
302 if (channels == 1)
303 chmap->map[c++] = SNDRV_CHMAP_MONO;
304 else
305 for (; c < channels && *maps; maps++)
306 chmap->map[c++] = *maps;
307 }
308
309 for (; c < channels; c++)
310 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
311
312 return chmap;
313}
314
315/*
316 * add this endpoint to the chip instance.
317 * if a stream with the same endpoint already exists, append to it.
318 * if not, create a new pcm stream.
319 */
320int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
321 int stream,
322 struct audioformat *fp)
323{
324 struct snd_usb_stream *as;
325 struct snd_usb_substream *subs;
326 struct snd_pcm *pcm;
327 int err;
328
329 list_for_each_entry(as, &chip->pcm_list, list) {
330 if (as->fmt_type != fp->fmt_type)
331 continue;
332 subs = &as->substream[stream];
333 if (subs->ep_num == fp->endpoint) {
334 list_add_tail(&fp->list, &subs->fmt_list);
335 subs->num_formats++;
336 subs->formats |= fp->formats;
337 return 0;
338 }
339 }
340 /* look for an empty stream */
341 list_for_each_entry(as, &chip->pcm_list, list) {
342 if (as->fmt_type != fp->fmt_type)
343 continue;
344 subs = &as->substream[stream];
345 if (subs->ep_num)
346 continue;
347 err = snd_pcm_new_stream(as->pcm, stream, 1);
348 if (err < 0)
349 return err;
350 snd_usb_init_substream(as, stream, fp);
351 return add_chmap(as->pcm, stream, subs);
352 }
353
354 /* create a new pcm */
355 as = kzalloc(sizeof(*as), GFP_KERNEL);
356 if (!as)
357 return -ENOMEM;
358 as->pcm_index = chip->pcm_devs;
359 as->chip = chip;
360 as->fmt_type = fp->fmt_type;
361 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
362 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
363 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
364 &pcm);
365 if (err < 0) {
366 kfree(as);
367 return err;
368 }
369 as->pcm = pcm;
370 pcm->private_data = as;
371 pcm->private_free = snd_usb_audio_pcm_free;
372 pcm->info_flags = 0;
373 if (chip->pcm_devs > 0)
374 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
375 else
376 strcpy(pcm->name, "USB Audio");
377
378 snd_usb_init_substream(as, stream, fp);
379
380 list_add(&as->list, &chip->pcm_list);
381 chip->pcm_devs++;
382
383 snd_usb_proc_pcm_format_add(as);
384
385 return add_chmap(pcm, stream, &as->substream[stream]);
386}
387
388static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
389 struct usb_host_interface *alts,
390 int protocol, int iface_no)
391{
392 /* parsed with a v1 header here. that's ok as we only look at the
393 * header first which is the same for both versions */
394 struct uac_iso_endpoint_descriptor *csep;
395 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
396 int attributes = 0;
397
398 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
399
400 /* Creamware Noah has this descriptor after the 2nd endpoint */
401 if (!csep && altsd->bNumEndpoints >= 2)
402 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
403
404 /*
405 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
406 * bytes after the first endpoint, go search the entire interface.
407 * Some devices have it directly *before* the standard endpoint.
408 */
409 if (!csep)
410 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
411
412 if (!csep || csep->bLength < 7 ||
413 csep->bDescriptorSubtype != UAC_EP_GENERAL) {
414 usb_audio_warn(chip,
415 "%u:%d : no or invalid class specific endpoint descriptor\n",
416 iface_no, altsd->bAlternateSetting);
417 return 0;
418 }
419
420 if (protocol == UAC_VERSION_1) {
421 attributes = csep->bmAttributes;
422 } else {
423 struct uac2_iso_endpoint_descriptor *csep2 =
424 (struct uac2_iso_endpoint_descriptor *) csep;
425
426 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
427
428 /* emulate the endpoint attributes of a v1 device */
429 if (csep2->bmControls & UAC2_CONTROL_PITCH)
430 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
431 }
432
433 return attributes;
434}
435
436/* find an input terminal descriptor (either UAC1 or UAC2) with the given
437 * terminal id
438 */
439static void *
440snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
441 int terminal_id)
442{
443 struct uac2_input_terminal_descriptor *term = NULL;
444
445 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
446 ctrl_iface->extralen,
447 term, UAC_INPUT_TERMINAL))) {
448 if (term->bTerminalID == terminal_id)
449 return term;
450 }
451
452 return NULL;
453}
454
455static struct uac2_output_terminal_descriptor *
456 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
457 int terminal_id)
458{
459 struct uac2_output_terminal_descriptor *term = NULL;
460
461 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
462 ctrl_iface->extralen,
463 term, UAC_OUTPUT_TERMINAL))) {
464 if (term->bTerminalID == terminal_id)
465 return term;
466 }
467
468 return NULL;
469}
470
471int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
472{
473 struct usb_device *dev;
474 struct usb_interface *iface;
475 struct usb_host_interface *alts;
476 struct usb_interface_descriptor *altsd;
477 int i, altno, err, stream;
478 unsigned int format = 0, num_channels = 0;
479 struct audioformat *fp = NULL;
480 int num, protocol, clock = 0;
481 struct uac_format_type_i_continuous_descriptor *fmt;
482 unsigned int chconfig;
483
484 dev = chip->dev;
485
486 /* parse the interface's altsettings */
487 iface = usb_ifnum_to_if(dev, iface_no);
488
489 num = iface->num_altsetting;
490
491 /*
492 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
493 * one misses syncpipe, and does not produce any sound.
494 */
495 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
496 num = 4;
497
498 for (i = 0; i < num; i++) {
499 alts = &iface->altsetting[i];
500 altsd = get_iface_desc(alts);
501 protocol = altsd->bInterfaceProtocol;
502 /* skip invalid one */
503 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
504 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
505 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
506 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
507 altsd->bNumEndpoints < 1 ||
508 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
509 continue;
510 /* must be isochronous */
511 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
512 USB_ENDPOINT_XFER_ISOC)
513 continue;
514 /* check direction */
515 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
516 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
517 altno = altsd->bAlternateSetting;
518
519 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
520 continue;
521
522 /*
523 * Roland audio streaming interfaces are marked with protocols
524 * 0/1/2, but are UAC 1 compatible.
525 */
526 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
527 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
528 protocol <= 2)
529 protocol = UAC_VERSION_1;
530
531 chconfig = 0;
532 /* get audio formats */
533 switch (protocol) {
534 default:
535 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
536 iface_no, altno, protocol);
537 protocol = UAC_VERSION_1;
538 /* fall through */
539
540 case UAC_VERSION_1: {
541 struct uac1_as_header_descriptor *as =
542 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
543 struct uac_input_terminal_descriptor *iterm;
544
545 if (!as) {
546 dev_err(&dev->dev,
547 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
548 iface_no, altno);
549 continue;
550 }
551
552 if (as->bLength < sizeof(*as)) {
553 dev_err(&dev->dev,
554 "%u:%d : invalid UAC_AS_GENERAL desc\n",
555 iface_no, altno);
556 continue;
557 }
558
559 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
560
561 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
562 as->bTerminalLink);
563 if (iterm) {
564 num_channels = iterm->bNrChannels;
565 chconfig = le16_to_cpu(iterm->wChannelConfig);
566 }
567
568 break;
569 }
570
571 case UAC_VERSION_2: {
572 struct uac2_input_terminal_descriptor *input_term;
573 struct uac2_output_terminal_descriptor *output_term;
574 struct uac2_as_header_descriptor *as =
575 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
576
577 if (!as) {
578 dev_err(&dev->dev,
579 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
580 iface_no, altno);
581 continue;
582 }
583
584 if (as->bLength < sizeof(*as)) {
585 dev_err(&dev->dev,
586 "%u:%d : invalid UAC_AS_GENERAL desc\n",
587 iface_no, altno);
588 continue;
589 }
590
591 num_channels = as->bNrChannels;
592 format = le32_to_cpu(as->bmFormats);
593 chconfig = le32_to_cpu(as->bmChannelConfig);
594
595 /* lookup the terminal associated to this interface
596 * to extract the clock */
597 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
598 as->bTerminalLink);
599 if (input_term) {
600 clock = input_term->bCSourceID;
601 if (!chconfig && (num_channels == input_term->bNrChannels))
602 chconfig = le32_to_cpu(input_term->bmChannelConfig);
603 break;
604 }
605
606 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
607 as->bTerminalLink);
608 if (output_term) {
609 clock = output_term->bCSourceID;
610 break;
611 }
612
613 dev_err(&dev->dev,
614 "%u:%d : bogus bTerminalLink %d\n",
615 iface_no, altno, as->bTerminalLink);
616 continue;
617 }
618 }
619
620 /* get format type */
621 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
622 if (!fmt) {
623 dev_err(&dev->dev,
624 "%u:%d : no UAC_FORMAT_TYPE desc\n",
625 iface_no, altno);
626 continue;
627 }
628 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
629 ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
630 dev_err(&dev->dev,
631 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
632 iface_no, altno);
633 continue;
634 }
635
636 /*
637 * Blue Microphones workaround: The last altsetting is identical
638 * with the previous one, except for a larger packet size, but
639 * is actually a mislabeled two-channel setting; ignore it.
640 */
641 if (fmt->bNrChannels == 1 &&
642 fmt->bSubframeSize == 2 &&
643 altno == 2 && num == 3 &&
644 fp && fp->altsetting == 1 && fp->channels == 1 &&
645 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
646 protocol == UAC_VERSION_1 &&
647 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
648 fp->maxpacksize * 2)
649 continue;
650
651 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
652 if (! fp) {
653 dev_err(&dev->dev, "cannot malloc\n");
654 return -ENOMEM;
655 }
656
657 fp->iface = iface_no;
658 fp->altsetting = altno;
659 fp->altset_idx = i;
660 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
661 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
662 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
663 fp->protocol = protocol;
664 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
665 fp->channels = num_channels;
666 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
667 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
668 * (fp->maxpacksize & 0x7ff);
669 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
670 fp->clock = clock;
671
672 /* some quirks for attributes here */
673
674 switch (chip->usb_id) {
675 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
676 /* Optoplay sets the sample rate attribute although
677 * it seems not supporting it in fact.
678 */
679 fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
680 break;
681 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
682 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
683 /* doesn't set the sample rate attribute, but supports it */
684 fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
685 break;
686 case USB_ID(0x0763, 0x2001): /* M-Audio Quattro USB */
687 case USB_ID(0x0763, 0x2012): /* M-Audio Fast Track Pro USB */
688 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
689 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
690 an older model 77d:223) */
691 /*
692 * plantronics headset and Griffin iMic have set adaptive-in
693 * although it's really not...
694 */
695 fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
696 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
697 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
698 else
699 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
700 break;
701 }
702
703 /* ok, let's parse further... */
704 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream) < 0) {
705 kfree(fp->rate_table);
706 kfree(fp);
707 fp = NULL;
708 continue;
709 }
710
711 /* Create chmap */
712 if (fp->channels != num_channels)
713 chconfig = 0;
714 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
715
716 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
717 err = snd_usb_add_audio_stream(chip, stream, fp);
718 if (err < 0) {
719 kfree(fp->rate_table);
720 kfree(fp->chmap);
721 kfree(fp);
722 return err;
723 }
724 /* try to set the interface... */
725 usb_set_interface(chip->dev, iface_no, altno);
726 snd_usb_init_pitch(chip, iface_no, alts, fp);
727 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
728 }
729 return 0;
730}
731
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
31static 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 */
42static void free_substream(struct snd_usb_substream *subs)
43{
44 struct audioformat *fp, *n;
45
46 if (!subs->num_formats)
47 return; /* not initialized */
48 list_for_each_entry_safe(fp, n, &subs->fmt_list, list)
49 audioformat_free(fp);
50 kfree(subs->rate_list.list);
51 kfree(subs->str_pd);
52 snd_media_stream_delete(subs);
53}
54
55
56/*
57 * free a usb stream instance
58 */
59static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
60{
61 free_substream(&stream->substream[0]);
62 free_substream(&stream->substream[1]);
63 list_del(&stream->list);
64 kfree(stream);
65}
66
67static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
68{
69 struct snd_usb_stream *stream = pcm->private_data;
70 if (stream) {
71 stream->pcm = NULL;
72 snd_usb_audio_stream_free(stream);
73 }
74}
75
76/*
77 * initialize the substream instance.
78 */
79
80static void snd_usb_init_substream(struct snd_usb_stream *as,
81 int stream,
82 struct audioformat *fp,
83 struct snd_usb_power_domain *pd)
84{
85 struct snd_usb_substream *subs = &as->substream[stream];
86
87 INIT_LIST_HEAD(&subs->fmt_list);
88 spin_lock_init(&subs->lock);
89
90 subs->stream = as;
91 subs->direction = stream;
92 subs->dev = as->chip->dev;
93 subs->txfr_quirk = as->chip->txfr_quirk;
94 subs->tx_length_quirk = as->chip->tx_length_quirk;
95 subs->speed = snd_usb_get_speed(subs->dev);
96 subs->pkt_offset_adj = 0;
97
98 snd_usb_set_pcm_ops(as->pcm, stream);
99
100 list_add_tail(&fp->list, &subs->fmt_list);
101 subs->formats |= fp->formats;
102 subs->num_formats++;
103 subs->fmt_type = fp->fmt_type;
104 subs->ep_num = fp->endpoint;
105 if (fp->channels > subs->channels_max)
106 subs->channels_max = fp->channels;
107
108 if (pd) {
109 subs->str_pd = pd;
110 /* Initialize Power Domain to idle status D1 */
111 snd_usb_power_domain_set(subs->stream->chip, pd,
112 UAC3_PD_STATE_D1);
113 }
114
115 snd_usb_preallocate_buffer(subs);
116}
117
118/* kctl callbacks for usb-audio channel maps */
119static 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 */
133static 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
146static 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
189static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
190 struct snd_ctl_elem_value *ucontrol)
191{
192 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
193 struct snd_usb_substream *subs = info->private_data;
194 struct snd_pcm_chmap_elem *chmap = NULL;
195 int i;
196
197 memset(ucontrol->value.integer.value, 0,
198 sizeof(ucontrol->value.integer.value));
199 if (subs->cur_audiofmt)
200 chmap = subs->cur_audiofmt->chmap;
201 if (chmap) {
202 for (i = 0; i < chmap->channels; i++)
203 ucontrol->value.integer.value[i] = chmap->map[i];
204 }
205 return 0;
206}
207
208/* create a chmap kctl assigned to the given USB substream */
209static 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 */
239static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
240 int protocol)
241{
242 static unsigned int uac1_maps[] = {
243 SNDRV_CHMAP_FL, /* left front */
244 SNDRV_CHMAP_FR, /* right front */
245 SNDRV_CHMAP_FC, /* center front */
246 SNDRV_CHMAP_LFE, /* LFE */
247 SNDRV_CHMAP_SL, /* left surround */
248 SNDRV_CHMAP_SR, /* right surround */
249 SNDRV_CHMAP_FLC, /* left of center */
250 SNDRV_CHMAP_FRC, /* right of center */
251 SNDRV_CHMAP_RC, /* surround */
252 SNDRV_CHMAP_SL, /* side left */
253 SNDRV_CHMAP_SR, /* side right */
254 SNDRV_CHMAP_TC, /* top */
255 0 /* terminator */
256 };
257 static unsigned int uac2_maps[] = {
258 SNDRV_CHMAP_FL, /* front left */
259 SNDRV_CHMAP_FR, /* front right */
260 SNDRV_CHMAP_FC, /* front center */
261 SNDRV_CHMAP_LFE, /* LFE */
262 SNDRV_CHMAP_RL, /* back left */
263 SNDRV_CHMAP_RR, /* back right */
264 SNDRV_CHMAP_FLC, /* front left of center */
265 SNDRV_CHMAP_FRC, /* front right of center */
266 SNDRV_CHMAP_RC, /* back center */
267 SNDRV_CHMAP_SL, /* side left */
268 SNDRV_CHMAP_SR, /* side right */
269 SNDRV_CHMAP_TC, /* top center */
270 SNDRV_CHMAP_TFL, /* top front left */
271 SNDRV_CHMAP_TFC, /* top front center */
272 SNDRV_CHMAP_TFR, /* top front right */
273 SNDRV_CHMAP_TRL, /* top back left */
274 SNDRV_CHMAP_TRC, /* top back center */
275 SNDRV_CHMAP_TRR, /* top back right */
276 SNDRV_CHMAP_TFLC, /* top front left of center */
277 SNDRV_CHMAP_TFRC, /* top front right of center */
278 SNDRV_CHMAP_LLFE, /* left LFE */
279 SNDRV_CHMAP_RLFE, /* right LFE */
280 SNDRV_CHMAP_TSL, /* top side left */
281 SNDRV_CHMAP_TSR, /* top side right */
282 SNDRV_CHMAP_BC, /* bottom center */
283 SNDRV_CHMAP_RLC, /* back left of center */
284 SNDRV_CHMAP_RRC, /* back right of center */
285 0 /* terminator */
286 };
287 struct snd_pcm_chmap_elem *chmap;
288 const unsigned int *maps;
289 int c;
290
291 if (channels > ARRAY_SIZE(chmap->map))
292 return NULL;
293
294 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
295 if (!chmap)
296 return NULL;
297
298 maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
299 chmap->channels = channels;
300 c = 0;
301
302 if (bits) {
303 for (; bits && *maps; maps++, bits >>= 1)
304 if (bits & 1)
305 chmap->map[c++] = *maps;
306 } else {
307 /* If we're missing wChannelConfig, then guess something
308 to make sure the channel map is not skipped entirely */
309 if (channels == 1)
310 chmap->map[c++] = SNDRV_CHMAP_MONO;
311 else
312 for (; c < channels && *maps; maps++)
313 chmap->map[c++] = *maps;
314 }
315
316 for (; c < channels; c++)
317 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
318
319 return chmap;
320}
321
322/* UAC3 device stores channels information in Cluster Descriptors */
323static struct
324snd_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 */
476static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
477 int stream,
478 struct audioformat *fp,
479 struct snd_usb_power_domain *pd)
480
481{
482 struct snd_usb_stream *as;
483 struct snd_usb_substream *subs;
484 struct snd_pcm *pcm;
485 int err;
486
487 list_for_each_entry(as, &chip->pcm_list, list) {
488 if (as->fmt_type != fp->fmt_type)
489 continue;
490 subs = &as->substream[stream];
491 if (subs->ep_num == fp->endpoint) {
492 list_add_tail(&fp->list, &subs->fmt_list);
493 subs->num_formats++;
494 subs->formats |= fp->formats;
495 return 0;
496 }
497 }
498 /* look for an empty stream */
499 list_for_each_entry(as, &chip->pcm_list, list) {
500 if (as->fmt_type != fp->fmt_type)
501 continue;
502 subs = &as->substream[stream];
503 if (subs->ep_num)
504 continue;
505 err = snd_pcm_new_stream(as->pcm, stream, 1);
506 if (err < 0)
507 return err;
508 snd_usb_init_substream(as, stream, fp, pd);
509 return add_chmap(as->pcm, stream, subs);
510 }
511
512 /* create a new pcm */
513 as = kzalloc(sizeof(*as), GFP_KERNEL);
514 if (!as)
515 return -ENOMEM;
516 as->pcm_index = chip->pcm_devs;
517 as->chip = chip;
518 as->fmt_type = fp->fmt_type;
519 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
520 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
521 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
522 &pcm);
523 if (err < 0) {
524 kfree(as);
525 return err;
526 }
527 as->pcm = pcm;
528 pcm->private_data = as;
529 pcm->private_free = snd_usb_audio_pcm_free;
530 pcm->info_flags = 0;
531 if (chip->pcm_devs > 0)
532 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
533 else
534 strcpy(pcm->name, "USB Audio");
535
536 snd_usb_init_substream(as, stream, fp, pd);
537
538 /*
539 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
540 * fix to swap capture stream order in conf/cards/USB-audio.conf
541 */
542 if (chip->usb_id == USB_ID(0x0763, 0x2003))
543 list_add(&as->list, &chip->pcm_list);
544 else
545 list_add_tail(&as->list, &chip->pcm_list);
546
547 chip->pcm_devs++;
548
549 snd_usb_proc_pcm_format_add(as);
550
551 return add_chmap(pcm, stream, &as->substream[stream]);
552}
553
554int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
555 int stream,
556 struct audioformat *fp)
557{
558 return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
559}
560
561static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
562 int stream,
563 struct audioformat *fp,
564 struct snd_usb_power_domain *pd)
565{
566 return __snd_usb_add_audio_stream(chip, stream, fp, pd);
567}
568
569static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
570 struct usb_host_interface *alts,
571 int protocol, int iface_no)
572{
573 /* parsed with a v1 header here. that's ok as we only look at the
574 * header first which is the same for both versions */
575 struct uac_iso_endpoint_descriptor *csep;
576 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
577 int attributes = 0;
578
579 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
580
581 /* Creamware Noah has this descriptor after the 2nd endpoint */
582 if (!csep && altsd->bNumEndpoints >= 2)
583 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
584
585 /*
586 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
587 * bytes after the first endpoint, go search the entire interface.
588 * Some devices have it directly *before* the standard endpoint.
589 */
590 if (!csep)
591 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
592
593 if (!csep || csep->bLength < 7 ||
594 csep->bDescriptorSubtype != UAC_EP_GENERAL)
595 goto error;
596
597 if (protocol == UAC_VERSION_1) {
598 attributes = csep->bmAttributes;
599 } else if (protocol == UAC_VERSION_2) {
600 struct uac2_iso_endpoint_descriptor *csep2 =
601 (struct uac2_iso_endpoint_descriptor *) csep;
602
603 if (csep2->bLength < sizeof(*csep2))
604 goto error;
605 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
606
607 /* emulate the endpoint attributes of a v1 device */
608 if (csep2->bmControls & UAC2_CONTROL_PITCH)
609 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
610 } else { /* UAC_VERSION_3 */
611 struct uac3_iso_endpoint_descriptor *csep3 =
612 (struct uac3_iso_endpoint_descriptor *) csep;
613
614 if (csep3->bLength < sizeof(*csep3))
615 goto error;
616 /* emulate the endpoint attributes of a v1 device */
617 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
618 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
619 }
620
621 return attributes;
622
623 error:
624 usb_audio_warn(chip,
625 "%u:%d : no or invalid class specific endpoint descriptor\n",
626 iface_no, altsd->bAlternateSetting);
627 return 0;
628}
629
630/* find an input terminal descriptor (either UAC1 or UAC2) with the given
631 * terminal id
632 */
633static void *
634snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
635 int terminal_id, int protocol)
636{
637 struct uac2_input_terminal_descriptor *term = NULL;
638
639 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
640 ctrl_iface->extralen,
641 term, UAC_INPUT_TERMINAL))) {
642 if (!snd_usb_validate_audio_desc(term, protocol))
643 continue;
644 if (term->bTerminalID == terminal_id)
645 return term;
646 }
647
648 return NULL;
649}
650
651static void *
652snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
653 int terminal_id, int protocol)
654{
655 /* OK to use with both UAC2 and UAC3 */
656 struct uac2_output_terminal_descriptor *term = NULL;
657
658 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
659 ctrl_iface->extralen,
660 term, UAC_OUTPUT_TERMINAL))) {
661 if (!snd_usb_validate_audio_desc(term, protocol))
662 continue;
663 if (term->bTerminalID == terminal_id)
664 return term;
665 }
666
667 return NULL;
668}
669
670static struct audioformat *
671audio_format_alloc_init(struct snd_usb_audio *chip,
672 struct usb_host_interface *alts,
673 int protocol, int iface_no, int altset_idx,
674 int altno, int num_channels, int clock)
675{
676 struct audioformat *fp;
677
678 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
679 if (!fp)
680 return NULL;
681
682 fp->iface = iface_no;
683 fp->altsetting = altno;
684 fp->altset_idx = altset_idx;
685 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
686 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
687 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
688 fp->protocol = protocol;
689 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
690 fp->channels = num_channels;
691 if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
692 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
693 * (fp->maxpacksize & 0x7ff);
694 fp->clock = clock;
695 INIT_LIST_HEAD(&fp->list);
696
697 return fp;
698}
699
700static struct audioformat *
701snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
702 struct usb_host_interface *alts,
703 int protocol, int iface_no, int altset_idx,
704 int altno, int stream, int bm_quirk)
705{
706 struct usb_device *dev = chip->dev;
707 struct uac_format_type_i_continuous_descriptor *fmt;
708 unsigned int num_channels = 0, chconfig = 0;
709 struct audioformat *fp;
710 int clock = 0;
711 u64 format;
712
713 /* get audio formats */
714 if (protocol == UAC_VERSION_1) {
715 struct uac1_as_header_descriptor *as =
716 snd_usb_find_csint_desc(alts->extra, alts->extralen,
717 NULL, UAC_AS_GENERAL);
718 struct uac_input_terminal_descriptor *iterm;
719
720 if (!as) {
721 dev_err(&dev->dev,
722 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
723 iface_no, altno);
724 return NULL;
725 }
726
727 if (as->bLength < sizeof(*as)) {
728 dev_err(&dev->dev,
729 "%u:%d : invalid UAC_AS_GENERAL desc\n",
730 iface_no, altno);
731 return NULL;
732 }
733
734 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
735
736 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
737 as->bTerminalLink,
738 protocol);
739 if (iterm) {
740 num_channels = iterm->bNrChannels;
741 chconfig = le16_to_cpu(iterm->wChannelConfig);
742 }
743 } else { /* UAC_VERSION_2 */
744 struct uac2_input_terminal_descriptor *input_term;
745 struct uac2_output_terminal_descriptor *output_term;
746 struct uac2_as_header_descriptor *as =
747 snd_usb_find_csint_desc(alts->extra, alts->extralen,
748 NULL, UAC_AS_GENERAL);
749
750 if (!as) {
751 dev_err(&dev->dev,
752 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
753 iface_no, altno);
754 return NULL;
755 }
756
757 if (as->bLength < sizeof(*as)) {
758 dev_err(&dev->dev,
759 "%u:%d : invalid UAC_AS_GENERAL desc\n",
760 iface_no, altno);
761 return NULL;
762 }
763
764 num_channels = as->bNrChannels;
765 format = le32_to_cpu(as->bmFormats);
766 chconfig = le32_to_cpu(as->bmChannelConfig);
767
768 /*
769 * lookup the terminal associated to this interface
770 * to extract the clock
771 */
772 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
773 as->bTerminalLink,
774 protocol);
775 if (input_term) {
776 clock = input_term->bCSourceID;
777 if (!chconfig && (num_channels == input_term->bNrChannels))
778 chconfig = le32_to_cpu(input_term->bmChannelConfig);
779 goto found_clock;
780 }
781
782 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
783 as->bTerminalLink,
784 protocol);
785 if (output_term) {
786 clock = output_term->bCSourceID;
787 goto found_clock;
788 }
789
790 dev_err(&dev->dev,
791 "%u:%d : bogus bTerminalLink %d\n",
792 iface_no, altno, as->bTerminalLink);
793 return NULL;
794 }
795
796found_clock:
797 /* get format type */
798 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
799 NULL, UAC_FORMAT_TYPE);
800 if (!fmt) {
801 dev_err(&dev->dev,
802 "%u:%d : no UAC_FORMAT_TYPE desc\n",
803 iface_no, altno);
804 return NULL;
805 }
806 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
807 || ((protocol == UAC_VERSION_2) &&
808 (fmt->bLength < 6))) {
809 dev_err(&dev->dev,
810 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
811 iface_no, altno);
812 return NULL;
813 }
814
815 /*
816 * Blue Microphones workaround: The last altsetting is
817 * identical with the previous one, except for a larger
818 * packet size, but is actually a mislabeled two-channel
819 * setting; ignore it.
820 *
821 * Part 2: analyze quirk flag and format
822 */
823 if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
824 return NULL;
825
826 fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
827 altset_idx, altno, num_channels, clock);
828 if (!fp)
829 return ERR_PTR(-ENOMEM);
830
831 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
832 iface_no);
833
834 /* some quirks for attributes here */
835 snd_usb_audioformat_attributes_quirk(chip, fp, stream);
836
837 /* ok, let's parse further... */
838 if (snd_usb_parse_audio_format(chip, fp, format,
839 fmt, stream) < 0) {
840 audioformat_free(fp);
841 return NULL;
842 }
843
844 /* Create chmap */
845 if (fp->channels != num_channels)
846 chconfig = 0;
847
848 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
849
850 return fp;
851}
852
853static struct audioformat *
854snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
855 struct usb_host_interface *alts,
856 struct snd_usb_power_domain **pd_out,
857 int iface_no, int altset_idx,
858 int altno, int stream)
859{
860 struct usb_device *dev = chip->dev;
861 struct uac3_input_terminal_descriptor *input_term;
862 struct uac3_output_terminal_descriptor *output_term;
863 struct uac3_cluster_header_descriptor *cluster;
864 struct uac3_as_header_descriptor *as = NULL;
865 struct uac3_hc_descriptor_header hc_header;
866 struct snd_pcm_chmap_elem *chmap;
867 struct snd_usb_power_domain *pd;
868 unsigned char badd_profile;
869 u64 badd_formats = 0;
870 unsigned int num_channels;
871 struct audioformat *fp;
872 u16 cluster_id, wLength;
873 int clock = 0;
874 int err;
875
876 badd_profile = chip->badd_profile;
877
878 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
879 unsigned int maxpacksize =
880 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
881
882 switch (maxpacksize) {
883 default:
884 dev_err(&dev->dev,
885 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
886 iface_no, altno);
887 return NULL;
888 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
889 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
890 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
891 num_channels = 1;
892 break;
893 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
894 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
895 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
896 num_channels = 1;
897 break;
898 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
899 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
900 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
901 num_channels = 2;
902 break;
903 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
904 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
905 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
906 num_channels = 2;
907 break;
908 }
909
910 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
911 if (!chmap)
912 return ERR_PTR(-ENOMEM);
913
914 if (num_channels == 1) {
915 chmap->map[0] = SNDRV_CHMAP_MONO;
916 } else {
917 chmap->map[0] = SNDRV_CHMAP_FL;
918 chmap->map[1] = SNDRV_CHMAP_FR;
919 }
920
921 chmap->channels = num_channels;
922 clock = UAC3_BADD_CS_ID9;
923 goto found_clock;
924 }
925
926 as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
927 NULL, UAC_AS_GENERAL);
928 if (!as) {
929 dev_err(&dev->dev,
930 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
931 iface_no, altno);
932 return NULL;
933 }
934
935 if (as->bLength < sizeof(*as)) {
936 dev_err(&dev->dev,
937 "%u:%d : invalid UAC_AS_GENERAL desc\n",
938 iface_no, altno);
939 return NULL;
940 }
941
942 cluster_id = le16_to_cpu(as->wClusterDescrID);
943 if (!cluster_id) {
944 dev_err(&dev->dev,
945 "%u:%d : no cluster descriptor\n",
946 iface_no, altno);
947 return NULL;
948 }
949
950 /*
951 * Get number of channels and channel map through
952 * High Capability Cluster Descriptor
953 *
954 * First step: get High Capability header and
955 * read size of Cluster Descriptor
956 */
957 err = snd_usb_ctl_msg(chip->dev,
958 usb_rcvctrlpipe(chip->dev, 0),
959 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
960 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
961 cluster_id,
962 snd_usb_ctrl_intf(chip),
963 &hc_header, sizeof(hc_header));
964 if (err < 0)
965 return ERR_PTR(err);
966 else if (err != sizeof(hc_header)) {
967 dev_err(&dev->dev,
968 "%u:%d : can't get High Capability descriptor\n",
969 iface_no, altno);
970 return ERR_PTR(-EIO);
971 }
972
973 /*
974 * Second step: allocate needed amount of memory
975 * and request Cluster Descriptor
976 */
977 wLength = le16_to_cpu(hc_header.wLength);
978 cluster = kzalloc(wLength, GFP_KERNEL);
979 if (!cluster)
980 return ERR_PTR(-ENOMEM);
981 err = snd_usb_ctl_msg(chip->dev,
982 usb_rcvctrlpipe(chip->dev, 0),
983 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
984 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
985 cluster_id,
986 snd_usb_ctrl_intf(chip),
987 cluster, wLength);
988 if (err < 0) {
989 kfree(cluster);
990 return ERR_PTR(err);
991 } else if (err != wLength) {
992 dev_err(&dev->dev,
993 "%u:%d : can't get Cluster Descriptor\n",
994 iface_no, altno);
995 kfree(cluster);
996 return ERR_PTR(-EIO);
997 }
998
999 num_channels = cluster->bNrChannels;
1000 chmap = convert_chmap_v3(cluster);
1001 kfree(cluster);
1002
1003 /*
1004 * lookup the terminal associated to this interface
1005 * to extract the clock
1006 */
1007 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1008 as->bTerminalLink,
1009 UAC_VERSION_3);
1010 if (input_term) {
1011 clock = input_term->bCSourceID;
1012 goto found_clock;
1013 }
1014
1015 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1016 as->bTerminalLink,
1017 UAC_VERSION_3);
1018 if (output_term) {
1019 clock = output_term->bCSourceID;
1020 goto found_clock;
1021 }
1022
1023 dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1024 iface_no, altno, as->bTerminalLink);
1025 kfree(chmap);
1026 return NULL;
1027
1028found_clock:
1029 fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1030 altset_idx, altno, num_channels, clock);
1031 if (!fp) {
1032 kfree(chmap);
1033 return ERR_PTR(-ENOMEM);
1034 }
1035
1036 fp->chmap = chmap;
1037
1038 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1039 fp->attributes = 0; /* No attributes */
1040
1041 fp->fmt_type = UAC_FORMAT_TYPE_I;
1042 fp->formats = badd_formats;
1043
1044 fp->nr_rates = 0; /* SNDRV_PCM_RATE_CONTINUOUS */
1045 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1046 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1047 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1048
1049 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1050 if (!pd) {
1051 audioformat_free(fp);
1052 return NULL;
1053 }
1054 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1055 UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1056 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1057 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1058
1059 } else {
1060 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1061 UAC_VERSION_3,
1062 iface_no);
1063
1064 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1065 as->bTerminalLink);
1066
1067 /* ok, let's parse further... */
1068 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1069 kfree(pd);
1070 audioformat_free(fp);
1071 return NULL;
1072 }
1073 }
1074
1075 if (pd)
1076 *pd_out = pd;
1077
1078 return fp;
1079}
1080
1081static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1082 int iface_no,
1083 bool *has_non_pcm, bool non_pcm)
1084{
1085 struct usb_device *dev;
1086 struct usb_interface *iface;
1087 struct usb_host_interface *alts;
1088 struct usb_interface_descriptor *altsd;
1089 int i, altno, err, stream;
1090 struct audioformat *fp = NULL;
1091 struct snd_usb_power_domain *pd = NULL;
1092 int num, protocol;
1093
1094 dev = chip->dev;
1095
1096 /* parse the interface's altsettings */
1097 iface = usb_ifnum_to_if(dev, iface_no);
1098
1099 num = iface->num_altsetting;
1100
1101 /*
1102 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1103 * one misses syncpipe, and does not produce any sound.
1104 */
1105 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1106 num = 4;
1107
1108 for (i = 0; i < num; i++) {
1109 alts = &iface->altsetting[i];
1110 altsd = get_iface_desc(alts);
1111 protocol = altsd->bInterfaceProtocol;
1112 /* skip invalid one */
1113 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1114 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1115 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1116 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1117 altsd->bNumEndpoints < 1 ||
1118 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1119 continue;
1120 /* must be isochronous */
1121 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1122 USB_ENDPOINT_XFER_ISOC)
1123 continue;
1124 /* check direction */
1125 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1126 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1127 altno = altsd->bAlternateSetting;
1128
1129 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1130 continue;
1131
1132 /*
1133 * Roland audio streaming interfaces are marked with protocols
1134 * 0/1/2, but are UAC 1 compatible.
1135 */
1136 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1137 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1138 protocol <= 2)
1139 protocol = UAC_VERSION_1;
1140
1141 switch (protocol) {
1142 default:
1143 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1144 iface_no, altno, protocol);
1145 protocol = UAC_VERSION_1;
1146 /* fall through */
1147 case UAC_VERSION_1:
1148 /* fall through */
1149 case UAC_VERSION_2: {
1150 int bm_quirk = 0;
1151
1152 /*
1153 * Blue Microphones workaround: The last altsetting is
1154 * identical with the previous one, except for a larger
1155 * packet size, but is actually a mislabeled two-channel
1156 * setting; ignore it.
1157 *
1158 * Part 1: prepare quirk flag
1159 */
1160 if (altno == 2 && num == 3 &&
1161 fp && fp->altsetting == 1 && fp->channels == 1 &&
1162 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1163 protocol == UAC_VERSION_1 &&
1164 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1165 fp->maxpacksize * 2)
1166 bm_quirk = 1;
1167
1168 fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1169 iface_no, i, altno,
1170 stream, bm_quirk);
1171 break;
1172 }
1173 case UAC_VERSION_3:
1174 fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1175 iface_no, i, altno, stream);
1176 break;
1177 }
1178
1179 if (!fp)
1180 continue;
1181 else if (IS_ERR(fp))
1182 return PTR_ERR(fp);
1183
1184 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1185 *has_non_pcm = true;
1186 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1187 audioformat_free(fp);
1188 kfree(pd);
1189 fp = NULL;
1190 pd = NULL;
1191 continue;
1192 }
1193
1194 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1195 if (protocol == UAC_VERSION_3)
1196 err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1197 else
1198 err = snd_usb_add_audio_stream(chip, stream, fp);
1199
1200 if (err < 0) {
1201 audioformat_free(fp);
1202 kfree(pd);
1203 return err;
1204 }
1205 /* try to set the interface... */
1206 usb_set_interface(chip->dev, iface_no, altno);
1207 snd_usb_init_pitch(chip, iface_no, alts, fp);
1208 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1209 }
1210 return 0;
1211}
1212
1213int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1214{
1215 int err;
1216 bool has_non_pcm = false;
1217
1218 /* parse PCM formats */
1219 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1220 if (err < 0)
1221 return err;
1222
1223 if (has_non_pcm) {
1224 /* parse non-PCM formats */
1225 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1226 if (err < 0)
1227 return err;
1228 }
1229
1230 return 0;
1231}
1232