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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 subs->stream_offset_adj = 0;
98
99 snd_usb_set_pcm_ops(as->pcm, stream);
100
101 list_add_tail(&fp->list, &subs->fmt_list);
102 subs->formats |= fp->formats;
103 subs->num_formats++;
104 subs->fmt_type = fp->fmt_type;
105 subs->ep_num = fp->endpoint;
106 if (fp->channels > subs->channels_max)
107 subs->channels_max = fp->channels;
108
109 if (pd) {
110 subs->str_pd = pd;
111 /* Initialize Power Domain to idle status D1 */
112 snd_usb_power_domain_set(subs->stream->chip, pd,
113 UAC3_PD_STATE_D1);
114 }
115
116 snd_usb_preallocate_buffer(subs);
117}
118
119/* kctl callbacks for usb-audio channel maps */
120static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
121 struct snd_ctl_elem_info *uinfo)
122{
123 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
124 struct snd_usb_substream *subs = info->private_data;
125
126 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
127 uinfo->count = subs->channels_max;
128 uinfo->value.integer.min = 0;
129 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
130 return 0;
131}
132
133/* check whether a duplicated entry exists in the audiofmt list */
134static bool have_dup_chmap(struct snd_usb_substream *subs,
135 struct audioformat *fp)
136{
137 struct audioformat *prev = fp;
138
139 list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
140 if (prev->chmap &&
141 !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
142 return true;
143 }
144 return false;
145}
146
147static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
148 unsigned int size, unsigned int __user *tlv)
149{
150 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
151 struct snd_usb_substream *subs = info->private_data;
152 struct audioformat *fp;
153 unsigned int __user *dst;
154 int count = 0;
155
156 if (size < 8)
157 return -ENOMEM;
158 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
159 return -EFAULT;
160 size -= 8;
161 dst = tlv + 2;
162 list_for_each_entry(fp, &subs->fmt_list, list) {
163 int i, ch_bytes;
164
165 if (!fp->chmap)
166 continue;
167 if (have_dup_chmap(subs, fp))
168 continue;
169 /* copy the entry */
170 ch_bytes = fp->chmap->channels * 4;
171 if (size < 8 + ch_bytes)
172 return -ENOMEM;
173 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
174 put_user(ch_bytes, dst + 1))
175 return -EFAULT;
176 dst += 2;
177 for (i = 0; i < fp->chmap->channels; i++, dst++) {
178 if (put_user(fp->chmap->map[i], dst))
179 return -EFAULT;
180 }
181
182 count += 8 + ch_bytes;
183 size -= 8 + ch_bytes;
184 }
185 if (put_user(count, tlv + 1))
186 return -EFAULT;
187 return 0;
188}
189
190static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
191 struct snd_ctl_elem_value *ucontrol)
192{
193 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
194 struct snd_usb_substream *subs = info->private_data;
195 struct snd_pcm_chmap_elem *chmap = NULL;
196 int i;
197
198 memset(ucontrol->value.integer.value, 0,
199 sizeof(ucontrol->value.integer.value));
200 if (subs->cur_audiofmt)
201 chmap = subs->cur_audiofmt->chmap;
202 if (chmap) {
203 for (i = 0; i < chmap->channels; i++)
204 ucontrol->value.integer.value[i] = chmap->map[i];
205 }
206 return 0;
207}
208
209/* create a chmap kctl assigned to the given USB substream */
210static int add_chmap(struct snd_pcm *pcm, int stream,
211 struct snd_usb_substream *subs)
212{
213 struct audioformat *fp;
214 struct snd_pcm_chmap *chmap;
215 struct snd_kcontrol *kctl;
216 int err;
217
218 list_for_each_entry(fp, &subs->fmt_list, list)
219 if (fp->chmap)
220 goto ok;
221 /* no chmap is found */
222 return 0;
223
224 ok:
225 err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
226 if (err < 0)
227 return err;
228
229 /* override handlers */
230 chmap->private_data = subs;
231 kctl = chmap->kctl;
232 kctl->info = usb_chmap_ctl_info;
233 kctl->get = usb_chmap_ctl_get;
234 kctl->tlv.c = usb_chmap_ctl_tlv;
235
236 return 0;
237}
238
239/* convert from USB ChannelConfig bits to ALSA chmap element */
240static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
241 int protocol)
242{
243 static const unsigned int uac1_maps[] = {
244 SNDRV_CHMAP_FL, /* left front */
245 SNDRV_CHMAP_FR, /* right front */
246 SNDRV_CHMAP_FC, /* center front */
247 SNDRV_CHMAP_LFE, /* LFE */
248 SNDRV_CHMAP_SL, /* left surround */
249 SNDRV_CHMAP_SR, /* right surround */
250 SNDRV_CHMAP_FLC, /* left of center */
251 SNDRV_CHMAP_FRC, /* right of center */
252 SNDRV_CHMAP_RC, /* surround */
253 SNDRV_CHMAP_SL, /* side left */
254 SNDRV_CHMAP_SR, /* side right */
255 SNDRV_CHMAP_TC, /* top */
256 0 /* terminator */
257 };
258 static const unsigned int uac2_maps[] = {
259 SNDRV_CHMAP_FL, /* front left */
260 SNDRV_CHMAP_FR, /* front right */
261 SNDRV_CHMAP_FC, /* front center */
262 SNDRV_CHMAP_LFE, /* LFE */
263 SNDRV_CHMAP_RL, /* back left */
264 SNDRV_CHMAP_RR, /* back right */
265 SNDRV_CHMAP_FLC, /* front left of center */
266 SNDRV_CHMAP_FRC, /* front right of center */
267 SNDRV_CHMAP_RC, /* back center */
268 SNDRV_CHMAP_SL, /* side left */
269 SNDRV_CHMAP_SR, /* side right */
270 SNDRV_CHMAP_TC, /* top center */
271 SNDRV_CHMAP_TFL, /* top front left */
272 SNDRV_CHMAP_TFC, /* top front center */
273 SNDRV_CHMAP_TFR, /* top front right */
274 SNDRV_CHMAP_TRL, /* top back left */
275 SNDRV_CHMAP_TRC, /* top back center */
276 SNDRV_CHMAP_TRR, /* top back right */
277 SNDRV_CHMAP_TFLC, /* top front left of center */
278 SNDRV_CHMAP_TFRC, /* top front right of center */
279 SNDRV_CHMAP_LLFE, /* left LFE */
280 SNDRV_CHMAP_RLFE, /* right LFE */
281 SNDRV_CHMAP_TSL, /* top side left */
282 SNDRV_CHMAP_TSR, /* top side right */
283 SNDRV_CHMAP_BC, /* bottom center */
284 SNDRV_CHMAP_RLC, /* back left of center */
285 SNDRV_CHMAP_RRC, /* back right of center */
286 0 /* terminator */
287 };
288 struct snd_pcm_chmap_elem *chmap;
289 const unsigned int *maps;
290 int c;
291
292 if (channels > ARRAY_SIZE(chmap->map))
293 return NULL;
294
295 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
296 if (!chmap)
297 return NULL;
298
299 maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
300 chmap->channels = channels;
301 c = 0;
302
303 if (bits) {
304 for (; bits && *maps; maps++, bits >>= 1)
305 if (bits & 1)
306 chmap->map[c++] = *maps;
307 } else {
308 /* If we're missing wChannelConfig, then guess something
309 to make sure the channel map is not skipped entirely */
310 if (channels == 1)
311 chmap->map[c++] = SNDRV_CHMAP_MONO;
312 else
313 for (; c < channels && *maps; maps++)
314 chmap->map[c++] = *maps;
315 }
316
317 for (; c < channels; c++)
318 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
319
320 return chmap;
321}
322
323/* UAC3 device stores channels information in Cluster Descriptors */
324static struct
325snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
326 *cluster)
327{
328 unsigned int channels = cluster->bNrChannels;
329 struct snd_pcm_chmap_elem *chmap;
330 void *p = cluster;
331 int len, c;
332
333 if (channels > ARRAY_SIZE(chmap->map))
334 return NULL;
335
336 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
337 if (!chmap)
338 return NULL;
339
340 len = le16_to_cpu(cluster->wLength);
341 c = 0;
342 p += sizeof(struct uac3_cluster_header_descriptor);
343
344 while (((p - (void *)cluster) < len) && (c < channels)) {
345 struct uac3_cluster_segment_descriptor *cs_desc = p;
346 u16 cs_len;
347 u8 cs_type;
348
349 cs_len = le16_to_cpu(cs_desc->wLength);
350 cs_type = cs_desc->bSegmentType;
351
352 if (cs_type == UAC3_CHANNEL_INFORMATION) {
353 struct uac3_cluster_information_segment_descriptor *is = p;
354 unsigned char map;
355
356 /*
357 * TODO: this conversion is not complete, update it
358 * after adding UAC3 values to asound.h
359 */
360 switch (is->bChRelationship) {
361 case UAC3_CH_MONO:
362 map = SNDRV_CHMAP_MONO;
363 break;
364 case UAC3_CH_LEFT:
365 case UAC3_CH_FRONT_LEFT:
366 case UAC3_CH_HEADPHONE_LEFT:
367 map = SNDRV_CHMAP_FL;
368 break;
369 case UAC3_CH_RIGHT:
370 case UAC3_CH_FRONT_RIGHT:
371 case UAC3_CH_HEADPHONE_RIGHT:
372 map = SNDRV_CHMAP_FR;
373 break;
374 case UAC3_CH_FRONT_CENTER:
375 map = SNDRV_CHMAP_FC;
376 break;
377 case UAC3_CH_FRONT_LEFT_OF_CENTER:
378 map = SNDRV_CHMAP_FLC;
379 break;
380 case UAC3_CH_FRONT_RIGHT_OF_CENTER:
381 map = SNDRV_CHMAP_FRC;
382 break;
383 case UAC3_CH_SIDE_LEFT:
384 map = SNDRV_CHMAP_SL;
385 break;
386 case UAC3_CH_SIDE_RIGHT:
387 map = SNDRV_CHMAP_SR;
388 break;
389 case UAC3_CH_BACK_LEFT:
390 map = SNDRV_CHMAP_RL;
391 break;
392 case UAC3_CH_BACK_RIGHT:
393 map = SNDRV_CHMAP_RR;
394 break;
395 case UAC3_CH_BACK_CENTER:
396 map = SNDRV_CHMAP_RC;
397 break;
398 case UAC3_CH_BACK_LEFT_OF_CENTER:
399 map = SNDRV_CHMAP_RLC;
400 break;
401 case UAC3_CH_BACK_RIGHT_OF_CENTER:
402 map = SNDRV_CHMAP_RRC;
403 break;
404 case UAC3_CH_TOP_CENTER:
405 map = SNDRV_CHMAP_TC;
406 break;
407 case UAC3_CH_TOP_FRONT_LEFT:
408 map = SNDRV_CHMAP_TFL;
409 break;
410 case UAC3_CH_TOP_FRONT_RIGHT:
411 map = SNDRV_CHMAP_TFR;
412 break;
413 case UAC3_CH_TOP_FRONT_CENTER:
414 map = SNDRV_CHMAP_TFC;
415 break;
416 case UAC3_CH_TOP_FRONT_LOC:
417 map = SNDRV_CHMAP_TFLC;
418 break;
419 case UAC3_CH_TOP_FRONT_ROC:
420 map = SNDRV_CHMAP_TFRC;
421 break;
422 case UAC3_CH_TOP_SIDE_LEFT:
423 map = SNDRV_CHMAP_TSL;
424 break;
425 case UAC3_CH_TOP_SIDE_RIGHT:
426 map = SNDRV_CHMAP_TSR;
427 break;
428 case UAC3_CH_TOP_BACK_LEFT:
429 map = SNDRV_CHMAP_TRL;
430 break;
431 case UAC3_CH_TOP_BACK_RIGHT:
432 map = SNDRV_CHMAP_TRR;
433 break;
434 case UAC3_CH_TOP_BACK_CENTER:
435 map = SNDRV_CHMAP_TRC;
436 break;
437 case UAC3_CH_BOTTOM_CENTER:
438 map = SNDRV_CHMAP_BC;
439 break;
440 case UAC3_CH_LOW_FREQUENCY_EFFECTS:
441 map = SNDRV_CHMAP_LFE;
442 break;
443 case UAC3_CH_LFE_LEFT:
444 map = SNDRV_CHMAP_LLFE;
445 break;
446 case UAC3_CH_LFE_RIGHT:
447 map = SNDRV_CHMAP_RLFE;
448 break;
449 case UAC3_CH_RELATIONSHIP_UNDEFINED:
450 default:
451 map = SNDRV_CHMAP_UNKNOWN;
452 break;
453 }
454 chmap->map[c++] = map;
455 }
456 p += cs_len;
457 }
458
459 if (channels < c)
460 pr_err("%s: channel number mismatch\n", __func__);
461
462 chmap->channels = channels;
463
464 for (; c < channels; c++)
465 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
466
467 return chmap;
468}
469
470/*
471 * add this endpoint to the chip instance.
472 * if a stream with the same endpoint already exists, append to it.
473 * if not, create a new pcm stream. note, fp is added to the substream
474 * fmt_list and will be freed on the chip instance release. do not free
475 * fp or do remove it from the substream fmt_list to avoid double-free.
476 */
477static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
478 int stream,
479 struct audioformat *fp,
480 struct snd_usb_power_domain *pd)
481
482{
483 struct snd_usb_stream *as;
484 struct snd_usb_substream *subs;
485 struct snd_pcm *pcm;
486 int err;
487
488 list_for_each_entry(as, &chip->pcm_list, list) {
489 if (as->fmt_type != fp->fmt_type)
490 continue;
491 subs = &as->substream[stream];
492 if (subs->ep_num == fp->endpoint) {
493 list_add_tail(&fp->list, &subs->fmt_list);
494 subs->num_formats++;
495 subs->formats |= fp->formats;
496 return 0;
497 }
498 }
499 /* look for an empty stream */
500 list_for_each_entry(as, &chip->pcm_list, list) {
501 if (as->fmt_type != fp->fmt_type)
502 continue;
503 subs = &as->substream[stream];
504 if (subs->ep_num)
505 continue;
506 if (snd_device_get_state(chip->card, as->pcm) !=
507 SNDRV_DEV_BUILD)
508 chip->need_delayed_register = true;
509 err = snd_pcm_new_stream(as->pcm, stream, 1);
510 if (err < 0)
511 return err;
512 snd_usb_init_substream(as, stream, fp, pd);
513 return add_chmap(as->pcm, stream, subs);
514 }
515
516 /* create a new pcm */
517 as = kzalloc(sizeof(*as), GFP_KERNEL);
518 if (!as)
519 return -ENOMEM;
520 as->pcm_index = chip->pcm_devs;
521 as->chip = chip;
522 as->fmt_type = fp->fmt_type;
523 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
524 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
525 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
526 &pcm);
527 if (err < 0) {
528 kfree(as);
529 return err;
530 }
531 as->pcm = pcm;
532 pcm->private_data = as;
533 pcm->private_free = snd_usb_audio_pcm_free;
534 pcm->info_flags = 0;
535 if (chip->pcm_devs > 0)
536 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
537 else
538 strcpy(pcm->name, "USB Audio");
539
540 snd_usb_init_substream(as, stream, fp, pd);
541
542 /*
543 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
544 * fix to swap capture stream order in conf/cards/USB-audio.conf
545 */
546 if (chip->usb_id == USB_ID(0x0763, 0x2003))
547 list_add(&as->list, &chip->pcm_list);
548 else
549 list_add_tail(&as->list, &chip->pcm_list);
550
551 chip->pcm_devs++;
552
553 snd_usb_proc_pcm_format_add(as);
554
555 return add_chmap(pcm, stream, &as->substream[stream]);
556}
557
558int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
559 int stream,
560 struct audioformat *fp)
561{
562 return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
563}
564
565static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
566 int stream,
567 struct audioformat *fp,
568 struct snd_usb_power_domain *pd)
569{
570 return __snd_usb_add_audio_stream(chip, stream, fp, pd);
571}
572
573static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
574 struct usb_host_interface *alts,
575 int protocol, int iface_no)
576{
577 /* parsed with a v1 header here. that's ok as we only look at the
578 * header first which is the same for both versions */
579 struct uac_iso_endpoint_descriptor *csep;
580 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
581 int attributes = 0;
582
583 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
584
585 /* Creamware Noah has this descriptor after the 2nd endpoint */
586 if (!csep && altsd->bNumEndpoints >= 2)
587 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
588
589 /*
590 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
591 * bytes after the first endpoint, go search the entire interface.
592 * Some devices have it directly *before* the standard endpoint.
593 */
594 if (!csep)
595 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
596
597 if (!csep || csep->bLength < 7 ||
598 csep->bDescriptorSubtype != UAC_EP_GENERAL)
599 goto error;
600
601 if (protocol == UAC_VERSION_1) {
602 attributes = csep->bmAttributes;
603 } else if (protocol == UAC_VERSION_2) {
604 struct uac2_iso_endpoint_descriptor *csep2 =
605 (struct uac2_iso_endpoint_descriptor *) csep;
606
607 if (csep2->bLength < sizeof(*csep2))
608 goto error;
609 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
610
611 /* emulate the endpoint attributes of a v1 device */
612 if (csep2->bmControls & UAC2_CONTROL_PITCH)
613 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
614 } else { /* UAC_VERSION_3 */
615 struct uac3_iso_endpoint_descriptor *csep3 =
616 (struct uac3_iso_endpoint_descriptor *) csep;
617
618 if (csep3->bLength < sizeof(*csep3))
619 goto error;
620 /* emulate the endpoint attributes of a v1 device */
621 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
622 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
623 }
624
625 return attributes;
626
627 error:
628 usb_audio_warn(chip,
629 "%u:%d : no or invalid class specific endpoint descriptor\n",
630 iface_no, altsd->bAlternateSetting);
631 return 0;
632}
633
634/* find an input terminal descriptor (either UAC1 or UAC2) with the given
635 * terminal id
636 */
637static void *
638snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
639 int terminal_id, int protocol)
640{
641 struct uac2_input_terminal_descriptor *term = NULL;
642
643 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
644 ctrl_iface->extralen,
645 term, UAC_INPUT_TERMINAL))) {
646 if (!snd_usb_validate_audio_desc(term, protocol))
647 continue;
648 if (term->bTerminalID == terminal_id)
649 return term;
650 }
651
652 return NULL;
653}
654
655static void *
656snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
657 int terminal_id, int protocol)
658{
659 /* OK to use with both UAC2 and UAC3 */
660 struct uac2_output_terminal_descriptor *term = NULL;
661
662 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
663 ctrl_iface->extralen,
664 term, UAC_OUTPUT_TERMINAL))) {
665 if (!snd_usb_validate_audio_desc(term, protocol))
666 continue;
667 if (term->bTerminalID == terminal_id)
668 return term;
669 }
670
671 return NULL;
672}
673
674static struct audioformat *
675audio_format_alloc_init(struct snd_usb_audio *chip,
676 struct usb_host_interface *alts,
677 int protocol, int iface_no, int altset_idx,
678 int altno, int num_channels, int clock)
679{
680 struct audioformat *fp;
681
682 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
683 if (!fp)
684 return NULL;
685
686 fp->iface = iface_no;
687 fp->altsetting = altno;
688 fp->altset_idx = altset_idx;
689 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
690 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
691 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
692 fp->protocol = protocol;
693 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
694 fp->channels = num_channels;
695 if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
696 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
697 * (fp->maxpacksize & 0x7ff);
698 fp->clock = clock;
699 INIT_LIST_HEAD(&fp->list);
700
701 return fp;
702}
703
704static struct audioformat *
705snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
706 struct usb_host_interface *alts,
707 int protocol, int iface_no, int altset_idx,
708 int altno, int stream, int bm_quirk)
709{
710 struct usb_device *dev = chip->dev;
711 struct uac_format_type_i_continuous_descriptor *fmt;
712 unsigned int num_channels = 0, chconfig = 0;
713 struct audioformat *fp;
714 int clock = 0;
715 u64 format;
716
717 /* get audio formats */
718 if (protocol == UAC_VERSION_1) {
719 struct uac1_as_header_descriptor *as =
720 snd_usb_find_csint_desc(alts->extra, alts->extralen,
721 NULL, UAC_AS_GENERAL);
722 struct uac_input_terminal_descriptor *iterm;
723
724 if (!as) {
725 dev_err(&dev->dev,
726 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
727 iface_no, altno);
728 return NULL;
729 }
730
731 if (as->bLength < sizeof(*as)) {
732 dev_err(&dev->dev,
733 "%u:%d : invalid UAC_AS_GENERAL desc\n",
734 iface_no, altno);
735 return NULL;
736 }
737
738 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
739
740 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
741 as->bTerminalLink,
742 protocol);
743 if (iterm) {
744 num_channels = iterm->bNrChannels;
745 chconfig = le16_to_cpu(iterm->wChannelConfig);
746 }
747 } else { /* UAC_VERSION_2 */
748 struct uac2_input_terminal_descriptor *input_term;
749 struct uac2_output_terminal_descriptor *output_term;
750 struct uac2_as_header_descriptor *as =
751 snd_usb_find_csint_desc(alts->extra, alts->extralen,
752 NULL, UAC_AS_GENERAL);
753
754 if (!as) {
755 dev_err(&dev->dev,
756 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
757 iface_no, altno);
758 return NULL;
759 }
760
761 if (as->bLength < sizeof(*as)) {
762 dev_err(&dev->dev,
763 "%u:%d : invalid UAC_AS_GENERAL desc\n",
764 iface_no, altno);
765 return NULL;
766 }
767
768 num_channels = as->bNrChannels;
769 format = le32_to_cpu(as->bmFormats);
770 chconfig = le32_to_cpu(as->bmChannelConfig);
771
772 /*
773 * lookup the terminal associated to this interface
774 * to extract the clock
775 */
776 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
777 as->bTerminalLink,
778 protocol);
779 if (input_term) {
780 clock = input_term->bCSourceID;
781 if (!chconfig && (num_channels == input_term->bNrChannels))
782 chconfig = le32_to_cpu(input_term->bmChannelConfig);
783 goto found_clock;
784 }
785
786 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
787 as->bTerminalLink,
788 protocol);
789 if (output_term) {
790 clock = output_term->bCSourceID;
791 goto found_clock;
792 }
793
794 dev_err(&dev->dev,
795 "%u:%d : bogus bTerminalLink %d\n",
796 iface_no, altno, as->bTerminalLink);
797 return NULL;
798 }
799
800found_clock:
801 /* get format type */
802 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
803 NULL, UAC_FORMAT_TYPE);
804 if (!fmt) {
805 dev_err(&dev->dev,
806 "%u:%d : no UAC_FORMAT_TYPE desc\n",
807 iface_no, altno);
808 return NULL;
809 }
810 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
811 || ((protocol == UAC_VERSION_2) &&
812 (fmt->bLength < 6))) {
813 dev_err(&dev->dev,
814 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
815 iface_no, altno);
816 return NULL;
817 }
818
819 /*
820 * Blue Microphones workaround: The last altsetting is
821 * identical with the previous one, except for a larger
822 * packet size, but is actually a mislabeled two-channel
823 * setting; ignore it.
824 *
825 * Part 2: analyze quirk flag and format
826 */
827 if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
828 return NULL;
829
830 fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
831 altset_idx, altno, num_channels, clock);
832 if (!fp)
833 return ERR_PTR(-ENOMEM);
834
835 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
836 iface_no);
837
838 /* some quirks for attributes here */
839 snd_usb_audioformat_attributes_quirk(chip, fp, stream);
840
841 /* ok, let's parse further... */
842 if (snd_usb_parse_audio_format(chip, fp, format,
843 fmt, stream) < 0) {
844 audioformat_free(fp);
845 return NULL;
846 }
847
848 /* Create chmap */
849 if (fp->channels != num_channels)
850 chconfig = 0;
851
852 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
853
854 return fp;
855}
856
857static struct audioformat *
858snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
859 struct usb_host_interface *alts,
860 struct snd_usb_power_domain **pd_out,
861 int iface_no, int altset_idx,
862 int altno, int stream)
863{
864 struct usb_device *dev = chip->dev;
865 struct uac3_input_terminal_descriptor *input_term;
866 struct uac3_output_terminal_descriptor *output_term;
867 struct uac3_cluster_header_descriptor *cluster;
868 struct uac3_as_header_descriptor *as = NULL;
869 struct uac3_hc_descriptor_header hc_header;
870 struct snd_pcm_chmap_elem *chmap;
871 struct snd_usb_power_domain *pd;
872 unsigned char badd_profile;
873 u64 badd_formats = 0;
874 unsigned int num_channels;
875 struct audioformat *fp;
876 u16 cluster_id, wLength;
877 int clock = 0;
878 int err;
879
880 badd_profile = chip->badd_profile;
881
882 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
883 unsigned int maxpacksize =
884 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
885
886 switch (maxpacksize) {
887 default:
888 dev_err(&dev->dev,
889 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
890 iface_no, altno);
891 return NULL;
892 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
893 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
894 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
895 num_channels = 1;
896 break;
897 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
898 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
899 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
900 num_channels = 1;
901 break;
902 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
903 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
904 badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
905 num_channels = 2;
906 break;
907 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
908 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
909 badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
910 num_channels = 2;
911 break;
912 }
913
914 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
915 if (!chmap)
916 return ERR_PTR(-ENOMEM);
917
918 if (num_channels == 1) {
919 chmap->map[0] = SNDRV_CHMAP_MONO;
920 } else {
921 chmap->map[0] = SNDRV_CHMAP_FL;
922 chmap->map[1] = SNDRV_CHMAP_FR;
923 }
924
925 chmap->channels = num_channels;
926 clock = UAC3_BADD_CS_ID9;
927 goto found_clock;
928 }
929
930 as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
931 NULL, UAC_AS_GENERAL);
932 if (!as) {
933 dev_err(&dev->dev,
934 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
935 iface_no, altno);
936 return NULL;
937 }
938
939 if (as->bLength < sizeof(*as)) {
940 dev_err(&dev->dev,
941 "%u:%d : invalid UAC_AS_GENERAL desc\n",
942 iface_no, altno);
943 return NULL;
944 }
945
946 cluster_id = le16_to_cpu(as->wClusterDescrID);
947 if (!cluster_id) {
948 dev_err(&dev->dev,
949 "%u:%d : no cluster descriptor\n",
950 iface_no, altno);
951 return NULL;
952 }
953
954 /*
955 * Get number of channels and channel map through
956 * High Capability Cluster Descriptor
957 *
958 * First step: get High Capability header and
959 * read size of Cluster Descriptor
960 */
961 err = snd_usb_ctl_msg(chip->dev,
962 usb_rcvctrlpipe(chip->dev, 0),
963 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
964 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
965 cluster_id,
966 snd_usb_ctrl_intf(chip),
967 &hc_header, sizeof(hc_header));
968 if (err < 0)
969 return ERR_PTR(err);
970 else if (err != sizeof(hc_header)) {
971 dev_err(&dev->dev,
972 "%u:%d : can't get High Capability descriptor\n",
973 iface_no, altno);
974 return ERR_PTR(-EIO);
975 }
976
977 /*
978 * Second step: allocate needed amount of memory
979 * and request Cluster Descriptor
980 */
981 wLength = le16_to_cpu(hc_header.wLength);
982 cluster = kzalloc(wLength, GFP_KERNEL);
983 if (!cluster)
984 return ERR_PTR(-ENOMEM);
985 err = snd_usb_ctl_msg(chip->dev,
986 usb_rcvctrlpipe(chip->dev, 0),
987 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
988 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
989 cluster_id,
990 snd_usb_ctrl_intf(chip),
991 cluster, wLength);
992 if (err < 0) {
993 kfree(cluster);
994 return ERR_PTR(err);
995 } else if (err != wLength) {
996 dev_err(&dev->dev,
997 "%u:%d : can't get Cluster Descriptor\n",
998 iface_no, altno);
999 kfree(cluster);
1000 return ERR_PTR(-EIO);
1001 }
1002
1003 num_channels = cluster->bNrChannels;
1004 chmap = convert_chmap_v3(cluster);
1005 kfree(cluster);
1006
1007 /*
1008 * lookup the terminal associated to this interface
1009 * to extract the clock
1010 */
1011 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1012 as->bTerminalLink,
1013 UAC_VERSION_3);
1014 if (input_term) {
1015 clock = input_term->bCSourceID;
1016 goto found_clock;
1017 }
1018
1019 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1020 as->bTerminalLink,
1021 UAC_VERSION_3);
1022 if (output_term) {
1023 clock = output_term->bCSourceID;
1024 goto found_clock;
1025 }
1026
1027 dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1028 iface_no, altno, as->bTerminalLink);
1029 kfree(chmap);
1030 return NULL;
1031
1032found_clock:
1033 fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1034 altset_idx, altno, num_channels, clock);
1035 if (!fp) {
1036 kfree(chmap);
1037 return ERR_PTR(-ENOMEM);
1038 }
1039
1040 fp->chmap = chmap;
1041
1042 if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1043 fp->attributes = 0; /* No attributes */
1044
1045 fp->fmt_type = UAC_FORMAT_TYPE_I;
1046 fp->formats = badd_formats;
1047
1048 fp->nr_rates = 0; /* SNDRV_PCM_RATE_CONTINUOUS */
1049 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1050 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1051 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1052
1053 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1054 if (!pd) {
1055 audioformat_free(fp);
1056 return NULL;
1057 }
1058 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1059 UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1060 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1061 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1062
1063 } else {
1064 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1065 UAC_VERSION_3,
1066 iface_no);
1067
1068 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1069 as->bTerminalLink);
1070
1071 /* ok, let's parse further... */
1072 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1073 kfree(pd);
1074 audioformat_free(fp);
1075 return NULL;
1076 }
1077 }
1078
1079 if (pd)
1080 *pd_out = pd;
1081
1082 return fp;
1083}
1084
1085static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1086 int iface_no,
1087 bool *has_non_pcm, bool non_pcm)
1088{
1089 struct usb_device *dev;
1090 struct usb_interface *iface;
1091 struct usb_host_interface *alts;
1092 struct usb_interface_descriptor *altsd;
1093 int i, altno, err, stream;
1094 struct audioformat *fp = NULL;
1095 struct snd_usb_power_domain *pd = NULL;
1096 int num, protocol;
1097
1098 dev = chip->dev;
1099
1100 /* parse the interface's altsettings */
1101 iface = usb_ifnum_to_if(dev, iface_no);
1102
1103 num = iface->num_altsetting;
1104
1105 /*
1106 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1107 * one misses syncpipe, and does not produce any sound.
1108 */
1109 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1110 num = 4;
1111
1112 for (i = 0; i < num; i++) {
1113 alts = &iface->altsetting[i];
1114 altsd = get_iface_desc(alts);
1115 protocol = altsd->bInterfaceProtocol;
1116 /* skip invalid one */
1117 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1118 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1119 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1120 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1121 altsd->bNumEndpoints < 1 ||
1122 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1123 continue;
1124 /* must be isochronous */
1125 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1126 USB_ENDPOINT_XFER_ISOC)
1127 continue;
1128 /* check direction */
1129 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1130 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1131 altno = altsd->bAlternateSetting;
1132
1133 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1134 continue;
1135
1136 /*
1137 * Roland audio streaming interfaces are marked with protocols
1138 * 0/1/2, but are UAC 1 compatible.
1139 */
1140 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1141 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1142 protocol <= 2)
1143 protocol = UAC_VERSION_1;
1144
1145 switch (protocol) {
1146 default:
1147 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1148 iface_no, altno, protocol);
1149 protocol = UAC_VERSION_1;
1150 fallthrough;
1151 case UAC_VERSION_1:
1152 case UAC_VERSION_2: {
1153 int bm_quirk = 0;
1154
1155 /*
1156 * Blue Microphones workaround: The last altsetting is
1157 * identical with the previous one, except for a larger
1158 * packet size, but is actually a mislabeled two-channel
1159 * setting; ignore it.
1160 *
1161 * Part 1: prepare quirk flag
1162 */
1163 if (altno == 2 && num == 3 &&
1164 fp && fp->altsetting == 1 && fp->channels == 1 &&
1165 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1166 protocol == UAC_VERSION_1 &&
1167 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1168 fp->maxpacksize * 2)
1169 bm_quirk = 1;
1170
1171 fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1172 iface_no, i, altno,
1173 stream, bm_quirk);
1174 break;
1175 }
1176 case UAC_VERSION_3:
1177 fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1178 iface_no, i, altno, stream);
1179 break;
1180 }
1181
1182 if (!fp)
1183 continue;
1184 else if (IS_ERR(fp))
1185 return PTR_ERR(fp);
1186
1187 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1188 *has_non_pcm = true;
1189 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1190 audioformat_free(fp);
1191 kfree(pd);
1192 fp = NULL;
1193 pd = NULL;
1194 continue;
1195 }
1196
1197 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1198 if (protocol == UAC_VERSION_3)
1199 err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1200 else
1201 err = snd_usb_add_audio_stream(chip, stream, fp);
1202
1203 if (err < 0) {
1204 audioformat_free(fp);
1205 kfree(pd);
1206 return err;
1207 }
1208 /* try to set the interface... */
1209 usb_set_interface(chip->dev, iface_no, altno);
1210 snd_usb_init_pitch(chip, iface_no, alts, fp);
1211 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1212 }
1213 return 0;
1214}
1215
1216int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1217{
1218 int err;
1219 bool has_non_pcm = false;
1220
1221 /* parse PCM formats */
1222 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1223 if (err < 0)
1224 return err;
1225
1226 if (has_non_pcm) {
1227 /* parse non-PCM formats */
1228 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1229 if (err < 0)
1230 return err;
1231 }
1232
1233 return 0;
1234}
1235
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