Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 */
4
5#include <linux/init.h>
6#include <linux/slab.h>
7#include <linux/usb.h>
8#include <linux/usb/audio.h>
9#include <linux/usb/audio-v2.h>
10#include <linux/usb/audio-v3.h>
11
12#include <sound/core.h>
13#include <sound/pcm.h>
14
15#include "usbaudio.h"
16#include "card.h"
17#include "quirks.h"
18#include "helper.h"
19#include "clock.h"
20#include "format.h"
21
22/*
23 * parse the audio format type I descriptor
24 * and returns the corresponding pcm format
25 *
26 * @dev: usb device
27 * @fp: audioformat record
28 * @format: the format tag (wFormatTag)
29 * @fmt: the format type descriptor (v1/v2) or AudioStreaming descriptor (v3)
30 */
31static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
32 struct audioformat *fp,
33 u64 format, void *_fmt)
34{
35 int sample_width, sample_bytes;
36 u64 pcm_formats = 0;
37
38 switch (fp->protocol) {
39 case UAC_VERSION_1:
40 default: {
41 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
42 if (format >= 64)
43 return 0; /* invalid format */
44 sample_width = fmt->bBitResolution;
45 sample_bytes = fmt->bSubframeSize;
46 format = 1ULL << format;
47 break;
48 }
49
50 case UAC_VERSION_2: {
51 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
52 sample_width = fmt->bBitResolution;
53 sample_bytes = fmt->bSubslotSize;
54
55 if (format & UAC2_FORMAT_TYPE_I_RAW_DATA) {
56 pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
57 /* flag potentially raw DSD capable altsettings */
58 fp->dsd_raw = true;
59 }
60
61 format <<= 1;
62 break;
63 }
64 case UAC_VERSION_3: {
65 struct uac3_as_header_descriptor *as = _fmt;
66
67 sample_width = as->bBitResolution;
68 sample_bytes = as->bSubslotSize;
69
70 if (format & UAC3_FORMAT_TYPE_I_RAW_DATA)
71 pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
72
73 format <<= 1;
74 break;
75 }
76 }
77
78 fp->fmt_bits = sample_width;
79
80 if ((pcm_formats == 0) &&
81 (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {
82 /* some devices don't define this correctly... */
83 usb_audio_info(chip, "%u:%d : format type 0 is detected, processed as PCM\n",
84 fp->iface, fp->altsetting);
85 format = 1 << UAC_FORMAT_TYPE_I_PCM;
86 }
87 if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
88 if (((chip->usb_id == USB_ID(0x0582, 0x0016)) ||
89 /* Edirol SD-90 */
90 (chip->usb_id == USB_ID(0x0582, 0x000c))) &&
91 /* Roland SC-D70 */
92 sample_width == 24 && sample_bytes == 2)
93 sample_bytes = 3;
94 else if (sample_width > sample_bytes * 8) {
95 usb_audio_info(chip, "%u:%d : sample bitwidth %d in over sample bytes %d\n",
96 fp->iface, fp->altsetting,
97 sample_width, sample_bytes);
98 }
99 /* check the format byte size */
100 switch (sample_bytes) {
101 case 1:
102 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
103 break;
104 case 2:
105 if (snd_usb_is_big_endian_format(chip, fp))
106 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
107 else
108 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
109 break;
110 case 3:
111 if (snd_usb_is_big_endian_format(chip, fp))
112 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
113 else
114 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
115 break;
116 case 4:
117 pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
118 break;
119 default:
120 usb_audio_info(chip,
121 "%u:%d : unsupported sample bitwidth %d in %d bytes\n",
122 fp->iface, fp->altsetting,
123 sample_width, sample_bytes);
124 break;
125 }
126 }
127 if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
128 /* Dallas DS4201 workaround: it advertises U8 format, but really
129 supports S8. */
130 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
131 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
132 else
133 pcm_formats |= SNDRV_PCM_FMTBIT_U8;
134 }
135 if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
136 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
137 }
138 if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
139 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
140 }
141 if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
142 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
143 }
144 if (format & ~0x3f) {
145 usb_audio_info(chip,
146 "%u:%d : unsupported format bits %#llx\n",
147 fp->iface, fp->altsetting, format);
148 }
149
150 pcm_formats |= snd_usb_interface_dsd_format_quirks(chip, fp, sample_bytes);
151
152 return pcm_formats;
153}
154
155static int set_fixed_rate(struct audioformat *fp, int rate, int rate_bits)
156{
157 kfree(fp->rate_table);
158 fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
159 if (!fp->rate_table)
160 return -ENOMEM;
161 fp->nr_rates = 1;
162 fp->rate_min = rate;
163 fp->rate_max = rate;
164 fp->rates = rate_bits;
165 fp->rate_table[0] = rate;
166 return 0;
167}
168
169/* set up rate_min, rate_max and rates from the rate table */
170static void set_rate_table_min_max(struct audioformat *fp)
171{
172 unsigned int rate;
173 int i;
174
175 fp->rate_min = INT_MAX;
176 fp->rate_max = 0;
177 fp->rates = 0;
178 for (i = 0; i < fp->nr_rates; i++) {
179 rate = fp->rate_table[i];
180 fp->rate_min = min(fp->rate_min, rate);
181 fp->rate_max = max(fp->rate_max, rate);
182 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
183 }
184}
185
186/*
187 * parse the format descriptor and stores the possible sample rates
188 * on the audioformat table (audio class v1).
189 *
190 * @dev: usb device
191 * @fp: audioformat record
192 * @fmt: the format descriptor
193 * @offset: the start offset of descriptor pointing the rate type
194 * (7 for type I and II, 8 for type II)
195 */
196static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
197 unsigned char *fmt, int offset)
198{
199 int nr_rates = fmt[offset];
200
201 if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
202 usb_audio_err(chip,
203 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
204 fp->iface, fp->altsetting);
205 return -EINVAL;
206 }
207
208 if (nr_rates) {
209 /*
210 * build the rate table and bitmap flags
211 */
212 int r, idx;
213
214 fp->rate_table = kmalloc_array(nr_rates, sizeof(int),
215 GFP_KERNEL);
216 if (fp->rate_table == NULL)
217 return -ENOMEM;
218
219 fp->nr_rates = 0;
220 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
221 unsigned int rate = combine_triple(&fmt[idx]);
222 if (!rate)
223 continue;
224 /* C-Media CM6501 mislabels its 96 kHz altsetting */
225 /* Terratec Aureon 7.1 USB C-Media 6206, too */
226 /* Ozone Z90 USB C-Media, too */
227 if (rate == 48000 && nr_rates == 1 &&
228 (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
229 chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
230 chip->usb_id == USB_ID(0x0d8c, 0x0078) ||
231 chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
232 fp->altsetting == 5 && fp->maxpacksize == 392)
233 rate = 96000;
234 /* Creative VF0420/VF0470 Live Cams report 16 kHz instead of 8kHz */
235 if (rate == 16000 &&
236 (chip->usb_id == USB_ID(0x041e, 0x4064) ||
237 chip->usb_id == USB_ID(0x041e, 0x4068)))
238 rate = 8000;
239
240 fp->rate_table[fp->nr_rates++] = rate;
241 }
242 if (!fp->nr_rates) {
243 usb_audio_info(chip,
244 "%u:%d: All rates were zero\n",
245 fp->iface, fp->altsetting);
246 return -EINVAL;
247 }
248 set_rate_table_min_max(fp);
249 } else {
250 /* continuous rates */
251 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
252 fp->rate_min = combine_triple(&fmt[offset + 1]);
253 fp->rate_max = combine_triple(&fmt[offset + 4]);
254 }
255
256 /* Jabra Evolve 65 headset */
257 if (chip->usb_id == USB_ID(0x0b0e, 0x030b)) {
258 /* only 48kHz for playback while keeping 16kHz for capture */
259 if (fp->nr_rates != 1)
260 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000);
261 }
262
263 return 0;
264}
265
266
267/*
268 * Presonus Studio 1810c supports a limited set of sampling
269 * rates per altsetting but reports the full set each time.
270 * If we don't filter out the unsupported rates and attempt
271 * to configure the card, it will hang refusing to do any
272 * further audio I/O until a hard reset is performed.
273 *
274 * The list of supported rates per altsetting (set of available
275 * I/O channels) is described in the owner's manual, section 2.2.
276 */
277static bool s1810c_valid_sample_rate(struct audioformat *fp,
278 unsigned int rate)
279{
280 switch (fp->altsetting) {
281 case 1:
282 /* All ADAT ports available */
283 return rate <= 48000;
284 case 2:
285 /* Half of ADAT ports available */
286 return (rate == 88200 || rate == 96000);
287 case 3:
288 /* Analog I/O only (no S/PDIF nor ADAT) */
289 return rate >= 176400;
290 default:
291 return false;
292 }
293 return false;
294}
295
296/*
297 * Many Focusrite devices supports a limited set of sampling rates per
298 * altsetting. Maximum rate is exposed in the last 4 bytes of Format Type
299 * descriptor which has a non-standard bLength = 10.
300 */
301static bool focusrite_valid_sample_rate(struct snd_usb_audio *chip,
302 struct audioformat *fp,
303 unsigned int rate)
304{
305 struct usb_interface *iface;
306 struct usb_host_interface *alts;
307 unsigned char *fmt;
308 unsigned int max_rate;
309
310 iface = usb_ifnum_to_if(chip->dev, fp->iface);
311 if (!iface)
312 return true;
313
314 alts = &iface->altsetting[fp->altset_idx];
315 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
316 NULL, UAC_FORMAT_TYPE);
317 if (!fmt)
318 return true;
319
320 if (fmt[0] == 10) { /* bLength */
321 max_rate = combine_quad(&fmt[6]);
322
323 /* Validate max rate */
324 if (max_rate != 48000 &&
325 max_rate != 96000 &&
326 max_rate != 192000 &&
327 max_rate != 384000) {
328
329 usb_audio_info(chip,
330 "%u:%d : unexpected max rate: %u\n",
331 fp->iface, fp->altsetting, max_rate);
332
333 return true;
334 }
335
336 return rate <= max_rate;
337 }
338
339 return true;
340}
341
342/*
343 * Helper function to walk the array of sample rate triplets reported by
344 * the device. The problem is that we need to parse whole array first to
345 * get to know how many sample rates we have to expect.
346 * Then fp->rate_table can be allocated and filled.
347 */
348static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
349 struct audioformat *fp, int nr_triplets,
350 const unsigned char *data)
351{
352 int i, nr_rates = 0;
353
354 for (i = 0; i < nr_triplets; i++) {
355 int min = combine_quad(&data[2 + 12 * i]);
356 int max = combine_quad(&data[6 + 12 * i]);
357 int res = combine_quad(&data[10 + 12 * i]);
358 unsigned int rate;
359
360 if ((max < 0) || (min < 0) || (res < 0) || (max < min))
361 continue;
362
363 /*
364 * for ranges with res == 1, we announce a continuous sample
365 * rate range, and this function should return 0 for no further
366 * parsing.
367 */
368 if (res == 1) {
369 fp->rate_min = min;
370 fp->rate_max = max;
371 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
372 return 0;
373 }
374
375 for (rate = min; rate <= max; rate += res) {
376
377 /* Filter out invalid rates on Presonus Studio 1810c */
378 if (chip->usb_id == USB_ID(0x194f, 0x010c) &&
379 !s1810c_valid_sample_rate(fp, rate))
380 goto skip_rate;
381
382 /* Filter out invalid rates on Focusrite devices */
383 if (USB_ID_VENDOR(chip->usb_id) == 0x1235 &&
384 !focusrite_valid_sample_rate(chip, fp, rate))
385 goto skip_rate;
386
387 if (fp->rate_table)
388 fp->rate_table[nr_rates] = rate;
389 nr_rates++;
390 if (nr_rates >= MAX_NR_RATES) {
391 usb_audio_err(chip, "invalid uac2 rates\n");
392 break;
393 }
394
395skip_rate:
396 /* avoid endless loop */
397 if (res == 0)
398 break;
399 }
400 }
401
402 return nr_rates;
403}
404
405/* Line6 Helix series and the Rode Rodecaster Pro don't support the
406 * UAC2_CS_RANGE usb function call. Return a static table of known
407 * clock rates.
408 */
409static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
410 struct audioformat *fp)
411{
412 switch (chip->usb_id) {
413 case USB_ID(0x0e41, 0x4241): /* Line6 Helix */
414 case USB_ID(0x0e41, 0x4242): /* Line6 Helix Rack */
415 case USB_ID(0x0e41, 0x4244): /* Line6 Helix LT */
416 case USB_ID(0x0e41, 0x4246): /* Line6 HX-Stomp */
417 case USB_ID(0x0e41, 0x4253): /* Line6 HX-Stomp XL */
418 case USB_ID(0x0e41, 0x4247): /* Line6 Pod Go */
419 case USB_ID(0x0e41, 0x4248): /* Line6 Helix >= fw 2.82 */
420 case USB_ID(0x0e41, 0x4249): /* Line6 Helix Rack >= fw 2.82 */
421 case USB_ID(0x0e41, 0x424a): /* Line6 Helix LT >= fw 2.82 */
422 case USB_ID(0x19f7, 0x0011): /* Rode Rodecaster Pro */
423 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000);
424 }
425
426 return -ENODEV;
427}
428
429/* check whether the given altsetting is supported for the already set rate */
430static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface,
431 int altsetting)
432{
433 struct usb_device *dev = chip->dev;
434 __le64 raw_data = 0;
435 u64 data;
436 int err;
437
438 /* we assume 64bit is enough for any altsettings */
439 if (snd_BUG_ON(altsetting >= 64 - 8))
440 return false;
441
442 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
443 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
444 UAC2_AS_VAL_ALT_SETTINGS << 8,
445 iface, &raw_data, sizeof(raw_data));
446 if (err < 0)
447 return false;
448
449 data = le64_to_cpu(raw_data);
450 /* first byte contains the bitmap size */
451 if ((data & 0xff) * 8 < altsetting)
452 return false;
453 if (data & (1ULL << (altsetting + 8)))
454 return true;
455
456 return false;
457}
458
459/*
460 * Validate each sample rate with the altsetting
461 * Rebuild the rate table if only partial values are valid
462 */
463static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
464 struct audioformat *fp,
465 int clock)
466{
467 struct usb_device *dev = chip->dev;
468 unsigned int *table;
469 unsigned int nr_rates;
470 int i, err;
471
472 /* performing the rate verification may lead to unexpected USB bus
473 * behavior afterwards by some unknown reason. Do this only for the
474 * known devices.
475 */
476 if (!(chip->quirk_flags & QUIRK_FLAG_VALIDATE_RATES))
477 return 0; /* don't perform the validation as default */
478
479 table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL);
480 if (!table)
481 return -ENOMEM;
482
483 /* clear the interface altsetting at first */
484 usb_set_interface(dev, fp->iface, 0);
485
486 nr_rates = 0;
487 for (i = 0; i < fp->nr_rates; i++) {
488 err = snd_usb_set_sample_rate_v2v3(chip, fp, clock,
489 fp->rate_table[i]);
490 if (err < 0)
491 continue;
492
493 if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting))
494 table[nr_rates++] = fp->rate_table[i];
495 }
496
497 if (!nr_rates) {
498 usb_audio_dbg(chip,
499 "No valid sample rate available for %d:%d, assuming a firmware bug\n",
500 fp->iface, fp->altsetting);
501 nr_rates = fp->nr_rates; /* continue as is */
502 }
503
504 if (fp->nr_rates == nr_rates) {
505 kfree(table);
506 return 0;
507 }
508
509 kfree(fp->rate_table);
510 fp->rate_table = table;
511 fp->nr_rates = nr_rates;
512 return 0;
513}
514
515/*
516 * parse the format descriptor and stores the possible sample rates
517 * on the audioformat table (audio class v2 and v3).
518 */
519static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
520 struct audioformat *fp)
521{
522 struct usb_device *dev = chip->dev;
523 unsigned char tmp[2], *data;
524 int nr_triplets, data_size, ret = 0, ret_l6;
525 int clock = snd_usb_clock_find_source(chip, fp, false);
526
527 if (clock < 0) {
528 dev_err(&dev->dev,
529 "%s(): unable to find clock source (clock %d)\n",
530 __func__, clock);
531 goto err;
532 }
533
534 /* get the number of sample rates first by only fetching 2 bytes */
535 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
536 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
537 UAC2_CS_CONTROL_SAM_FREQ << 8,
538 snd_usb_ctrl_intf(chip) | (clock << 8),
539 tmp, sizeof(tmp));
540
541 if (ret < 0) {
542 /* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */
543 ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp);
544 if (ret_l6 == -ENODEV) {
545 /* no line6 device found continue showing the error */
546 dev_err(&dev->dev,
547 "%s(): unable to retrieve number of sample rates (clock %d)\n",
548 __func__, clock);
549 goto err;
550 }
551 if (ret_l6 == 0) {
552 dev_info(&dev->dev,
553 "%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).\n",
554 __func__, clock);
555 return 0;
556 }
557 ret = ret_l6;
558 goto err;
559 }
560
561 nr_triplets = (tmp[1] << 8) | tmp[0];
562 data_size = 2 + 12 * nr_triplets;
563 data = kzalloc(data_size, GFP_KERNEL);
564 if (!data) {
565 ret = -ENOMEM;
566 goto err;
567 }
568
569 /* now get the full information */
570 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
571 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
572 UAC2_CS_CONTROL_SAM_FREQ << 8,
573 snd_usb_ctrl_intf(chip) | (clock << 8),
574 data, data_size);
575
576 if (ret < 0) {
577 dev_err(&dev->dev,
578 "%s(): unable to retrieve sample rate range (clock %d)\n",
579 __func__, clock);
580 ret = -EINVAL;
581 goto err_free;
582 }
583
584 /* Call the triplet parser, and make sure fp->rate_table is NULL.
585 * We just use the return value to know how many sample rates we
586 * will have to deal with. */
587 kfree(fp->rate_table);
588 fp->rate_table = NULL;
589 fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
590
591 if (fp->nr_rates == 0) {
592 /* SNDRV_PCM_RATE_CONTINUOUS */
593 ret = 0;
594 goto err_free;
595 }
596
597 fp->rate_table = kmalloc_array(fp->nr_rates, sizeof(int), GFP_KERNEL);
598 if (!fp->rate_table) {
599 ret = -ENOMEM;
600 goto err_free;
601 }
602
603 /* Call the triplet parser again, but this time, fp->rate_table is
604 * allocated, so the rates will be stored */
605 parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
606
607 ret = validate_sample_rate_table_v2v3(chip, fp, clock);
608 if (ret < 0)
609 goto err_free;
610
611 set_rate_table_min_max(fp);
612
613err_free:
614 kfree(data);
615err:
616 return ret;
617}
618
619/*
620 * parse the format type I and III descriptors
621 */
622static int parse_audio_format_i(struct snd_usb_audio *chip,
623 struct audioformat *fp, u64 format,
624 void *_fmt)
625{
626 snd_pcm_format_t pcm_format;
627 unsigned int fmt_type;
628 int ret;
629
630 switch (fp->protocol) {
631 default:
632 case UAC_VERSION_1:
633 case UAC_VERSION_2: {
634 struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
635
636 fmt_type = fmt->bFormatType;
637 break;
638 }
639 case UAC_VERSION_3: {
640 /* fp->fmt_type is already set in this case */
641 fmt_type = fp->fmt_type;
642 break;
643 }
644 }
645
646 if (fmt_type == UAC_FORMAT_TYPE_III) {
647 /* FIXME: the format type is really IECxxx
648 * but we give normal PCM format to get the existing
649 * apps working...
650 */
651 switch (chip->usb_id) {
652
653 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
654 if (chip->setup == 0x00 &&
655 fp->altsetting == 6)
656 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
657 else
658 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
659 break;
660 default:
661 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
662 }
663 fp->formats = pcm_format_to_bits(pcm_format);
664 } else {
665 fp->formats = parse_audio_format_i_type(chip, fp, format, _fmt);
666 if (!fp->formats)
667 return -EINVAL;
668 }
669
670 /* gather possible sample rates */
671 /* audio class v1 reports possible sample rates as part of the
672 * proprietary class specific descriptor.
673 * audio class v2 uses class specific EP0 range requests for that.
674 */
675 switch (fp->protocol) {
676 default:
677 case UAC_VERSION_1: {
678 struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
679
680 fp->channels = fmt->bNrChannels;
681 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
682 break;
683 }
684 case UAC_VERSION_2:
685 case UAC_VERSION_3: {
686 /* fp->channels is already set in this case */
687 ret = parse_audio_format_rates_v2v3(chip, fp);
688 break;
689 }
690 }
691
692 if (fp->channels < 1) {
693 usb_audio_err(chip,
694 "%u:%d : invalid channels %d\n",
695 fp->iface, fp->altsetting, fp->channels);
696 return -EINVAL;
697 }
698
699 return ret;
700}
701
702/*
703 * parse the format type II descriptor
704 */
705static int parse_audio_format_ii(struct snd_usb_audio *chip,
706 struct audioformat *fp,
707 u64 format, void *_fmt)
708{
709 int brate, framesize, ret;
710
711 switch (format) {
712 case UAC_FORMAT_TYPE_II_AC3:
713 /* FIXME: there is no AC3 format defined yet */
714 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
715 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
716 break;
717 case UAC_FORMAT_TYPE_II_MPEG:
718 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
719 break;
720 default:
721 usb_audio_info(chip,
722 "%u:%d : unknown format tag %#llx is detected. processed as MPEG.\n",
723 fp->iface, fp->altsetting, format);
724 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
725 break;
726 }
727
728 fp->channels = 1;
729
730 switch (fp->protocol) {
731 default:
732 case UAC_VERSION_1: {
733 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
734 brate = le16_to_cpu(fmt->wMaxBitRate);
735 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
736 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
737 fp->frame_size = framesize;
738 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
739 break;
740 }
741 case UAC_VERSION_2: {
742 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
743 brate = le16_to_cpu(fmt->wMaxBitRate);
744 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
745 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
746 fp->frame_size = framesize;
747 ret = parse_audio_format_rates_v2v3(chip, fp);
748 break;
749 }
750 }
751
752 return ret;
753}
754
755int snd_usb_parse_audio_format(struct snd_usb_audio *chip,
756 struct audioformat *fp, u64 format,
757 struct uac_format_type_i_continuous_descriptor *fmt,
758 int stream)
759{
760 int err;
761
762 switch (fmt->bFormatType) {
763 case UAC_FORMAT_TYPE_I:
764 case UAC_FORMAT_TYPE_III:
765 err = parse_audio_format_i(chip, fp, format, fmt);
766 break;
767 case UAC_FORMAT_TYPE_II:
768 err = parse_audio_format_ii(chip, fp, format, fmt);
769 break;
770 default:
771 usb_audio_info(chip,
772 "%u:%d : format type %d is not supported yet\n",
773 fp->iface, fp->altsetting,
774 fmt->bFormatType);
775 return -ENOTSUPP;
776 }
777 fp->fmt_type = fmt->bFormatType;
778 if (err < 0)
779 return err;
780#if 1
781 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
782 /* extigy apparently supports sample rates other than 48k
783 * but not in ordinary way. so we enable only 48k atm.
784 */
785 if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
786 chip->usb_id == USB_ID(0x041e, 0x3020) ||
787 chip->usb_id == USB_ID(0x041e, 0x3061)) {
788 if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&
789 fp->rates != SNDRV_PCM_RATE_48000 &&
790 fp->rates != SNDRV_PCM_RATE_96000)
791 return -ENOTSUPP;
792 }
793#endif
794 return 0;
795}
796
797int snd_usb_parse_audio_format_v3(struct snd_usb_audio *chip,
798 struct audioformat *fp,
799 struct uac3_as_header_descriptor *as,
800 int stream)
801{
802 u64 format = le64_to_cpu(as->bmFormats);
803 int err;
804
805 /*
806 * Type I format bits are D0..D6
807 * This test works because type IV is not supported
808 */
809 if (format & 0x7f)
810 fp->fmt_type = UAC_FORMAT_TYPE_I;
811 else
812 fp->fmt_type = UAC_FORMAT_TYPE_III;
813
814 err = parse_audio_format_i(chip, fp, format, as);
815 if (err < 0)
816 return err;
817
818 return 0;
819}
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
27#include "usbaudio.h"
28#include "card.h"
29#include "quirks.h"
30#include "helper.h"
31#include "debug.h"
32#include "clock.h"
33#include "format.h"
34
35/*
36 * parse the audio format type I descriptor
37 * and returns the corresponding pcm format
38 *
39 * @dev: usb device
40 * @fp: audioformat record
41 * @format: the format tag (wFormatTag)
42 * @fmt: the format type descriptor
43 */
44static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
45 struct audioformat *fp,
46 unsigned int format, void *_fmt)
47{
48 int sample_width, sample_bytes;
49 u64 pcm_formats = 0;
50
51 switch (fp->protocol) {
52 case UAC_VERSION_1:
53 default: {
54 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
55 sample_width = fmt->bBitResolution;
56 sample_bytes = fmt->bSubframeSize;
57 format = 1 << format;
58 break;
59 }
60
61 case UAC_VERSION_2: {
62 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
63 sample_width = fmt->bBitResolution;
64 sample_bytes = fmt->bSubslotSize;
65
66 if (format & UAC2_FORMAT_TYPE_I_RAW_DATA)
67 pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
68
69 format <<= 1;
70 break;
71 }
72 }
73
74 if ((pcm_formats == 0) &&
75 (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {
76 /* some devices don't define this correctly... */
77 usb_audio_info(chip, "%u:%d : format type 0 is detected, processed as PCM\n",
78 fp->iface, fp->altsetting);
79 format = 1 << UAC_FORMAT_TYPE_I_PCM;
80 }
81 if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
82 if (((chip->usb_id == USB_ID(0x0582, 0x0016)) ||
83 /* Edirol SD-90 */
84 (chip->usb_id == USB_ID(0x0582, 0x000c))) &&
85 /* Roland SC-D70 */
86 sample_width == 24 && sample_bytes == 2)
87 sample_bytes = 3;
88 else if (sample_width > sample_bytes * 8) {
89 usb_audio_info(chip, "%u:%d : sample bitwidth %d in over sample bytes %d\n",
90 fp->iface, fp->altsetting,
91 sample_width, sample_bytes);
92 }
93 /* check the format byte size */
94 switch (sample_bytes) {
95 case 1:
96 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
97 break;
98 case 2:
99 if (snd_usb_is_big_endian_format(chip, fp))
100 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
101 else
102 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
103 break;
104 case 3:
105 if (snd_usb_is_big_endian_format(chip, fp))
106 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
107 else
108 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
109 break;
110 case 4:
111 pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
112 break;
113 default:
114 usb_audio_info(chip,
115 "%u:%d : unsupported sample bitwidth %d in %d bytes\n",
116 fp->iface, fp->altsetting,
117 sample_width, sample_bytes);
118 break;
119 }
120 }
121 if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
122 /* Dallas DS4201 workaround: it advertises U8 format, but really
123 supports S8. */
124 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
125 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
126 else
127 pcm_formats |= SNDRV_PCM_FMTBIT_U8;
128 }
129 if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
130 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
131 }
132 if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
133 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
134 }
135 if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
136 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
137 }
138 if (format & ~0x3f) {
139 usb_audio_info(chip,
140 "%u:%d : unsupported format bits %#x\n",
141 fp->iface, fp->altsetting, format);
142 }
143
144 pcm_formats |= snd_usb_interface_dsd_format_quirks(chip, fp, sample_bytes);
145
146 return pcm_formats;
147}
148
149
150/*
151 * parse the format descriptor and stores the possible sample rates
152 * on the audioformat table (audio class v1).
153 *
154 * @dev: usb device
155 * @fp: audioformat record
156 * @fmt: the format descriptor
157 * @offset: the start offset of descriptor pointing the rate type
158 * (7 for type I and II, 8 for type II)
159 */
160static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
161 unsigned char *fmt, int offset)
162{
163 int nr_rates = fmt[offset];
164
165 if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
166 usb_audio_err(chip,
167 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
168 fp->iface, fp->altsetting);
169 return -EINVAL;
170 }
171
172 if (nr_rates) {
173 /*
174 * build the rate table and bitmap flags
175 */
176 int r, idx;
177
178 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
179 if (fp->rate_table == NULL) {
180 usb_audio_err(chip, "cannot malloc\n");
181 return -ENOMEM;
182 }
183
184 fp->nr_rates = 0;
185 fp->rate_min = fp->rate_max = 0;
186 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
187 unsigned int rate = combine_triple(&fmt[idx]);
188 if (!rate)
189 continue;
190 /* C-Media CM6501 mislabels its 96 kHz altsetting */
191 /* Terratec Aureon 7.1 USB C-Media 6206, too */
192 if (rate == 48000 && nr_rates == 1 &&
193 (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
194 chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
195 chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
196 fp->altsetting == 5 && fp->maxpacksize == 392)
197 rate = 96000;
198 /* Creative VF0420/VF0470 Live Cams report 16 kHz instead of 8kHz */
199 if (rate == 16000 &&
200 (chip->usb_id == USB_ID(0x041e, 0x4064) ||
201 chip->usb_id == USB_ID(0x041e, 0x4068)))
202 rate = 8000;
203
204 fp->rate_table[fp->nr_rates] = rate;
205 if (!fp->rate_min || rate < fp->rate_min)
206 fp->rate_min = rate;
207 if (!fp->rate_max || rate > fp->rate_max)
208 fp->rate_max = rate;
209 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
210 fp->nr_rates++;
211 }
212 if (!fp->nr_rates) {
213 hwc_debug("All rates were zero. Skipping format!\n");
214 return -EINVAL;
215 }
216 } else {
217 /* continuous rates */
218 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
219 fp->rate_min = combine_triple(&fmt[offset + 1]);
220 fp->rate_max = combine_triple(&fmt[offset + 4]);
221 }
222 return 0;
223}
224
225/*
226 * Helper function to walk the array of sample rate triplets reported by
227 * the device. The problem is that we need to parse whole array first to
228 * get to know how many sample rates we have to expect.
229 * Then fp->rate_table can be allocated and filled.
230 */
231static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
232 struct audioformat *fp, int nr_triplets,
233 const unsigned char *data)
234{
235 int i, nr_rates = 0;
236
237 fp->rates = fp->rate_min = fp->rate_max = 0;
238
239 for (i = 0; i < nr_triplets; i++) {
240 int min = combine_quad(&data[2 + 12 * i]);
241 int max = combine_quad(&data[6 + 12 * i]);
242 int res = combine_quad(&data[10 + 12 * i]);
243 unsigned int rate;
244
245 if ((max < 0) || (min < 0) || (res < 0) || (max < min))
246 continue;
247
248 /*
249 * for ranges with res == 1, we announce a continuous sample
250 * rate range, and this function should return 0 for no further
251 * parsing.
252 */
253 if (res == 1) {
254 fp->rate_min = min;
255 fp->rate_max = max;
256 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
257 return 0;
258 }
259
260 for (rate = min; rate <= max; rate += res) {
261 if (fp->rate_table)
262 fp->rate_table[nr_rates] = rate;
263 if (!fp->rate_min || rate < fp->rate_min)
264 fp->rate_min = rate;
265 if (!fp->rate_max || rate > fp->rate_max)
266 fp->rate_max = rate;
267 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
268
269 nr_rates++;
270 if (nr_rates >= MAX_NR_RATES) {
271 usb_audio_err(chip, "invalid uac2 rates\n");
272 break;
273 }
274
275 /* avoid endless loop */
276 if (res == 0)
277 break;
278 }
279 }
280
281 return nr_rates;
282}
283
284/*
285 * parse the format descriptor and stores the possible sample rates
286 * on the audioformat table (audio class v2).
287 */
288static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
289 struct audioformat *fp)
290{
291 struct usb_device *dev = chip->dev;
292 unsigned char tmp[2], *data;
293 int nr_triplets, data_size, ret = 0;
294 int clock = snd_usb_clock_find_source(chip, fp->clock, false);
295
296 if (clock < 0) {
297 dev_err(&dev->dev,
298 "%s(): unable to find clock source (clock %d)\n",
299 __func__, clock);
300 goto err;
301 }
302
303 /* get the number of sample rates first by only fetching 2 bytes */
304 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
305 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
306 UAC2_CS_CONTROL_SAM_FREQ << 8,
307 snd_usb_ctrl_intf(chip) | (clock << 8),
308 tmp, sizeof(tmp));
309
310 if (ret < 0) {
311 dev_err(&dev->dev,
312 "%s(): unable to retrieve number of sample rates (clock %d)\n",
313 __func__, clock);
314 goto err;
315 }
316
317 nr_triplets = (tmp[1] << 8) | tmp[0];
318 data_size = 2 + 12 * nr_triplets;
319 data = kzalloc(data_size, GFP_KERNEL);
320 if (!data) {
321 ret = -ENOMEM;
322 goto err;
323 }
324
325 /* now get the full information */
326 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
327 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
328 UAC2_CS_CONTROL_SAM_FREQ << 8,
329 snd_usb_ctrl_intf(chip) | (clock << 8),
330 data, data_size);
331
332 if (ret < 0) {
333 dev_err(&dev->dev,
334 "%s(): unable to retrieve sample rate range (clock %d)\n",
335 __func__, clock);
336 ret = -EINVAL;
337 goto err_free;
338 }
339
340 /* Call the triplet parser, and make sure fp->rate_table is NULL.
341 * We just use the return value to know how many sample rates we
342 * will have to deal with. */
343 kfree(fp->rate_table);
344 fp->rate_table = NULL;
345 fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
346
347 if (fp->nr_rates == 0) {
348 /* SNDRV_PCM_RATE_CONTINUOUS */
349 ret = 0;
350 goto err_free;
351 }
352
353 fp->rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
354 if (!fp->rate_table) {
355 ret = -ENOMEM;
356 goto err_free;
357 }
358
359 /* Call the triplet parser again, but this time, fp->rate_table is
360 * allocated, so the rates will be stored */
361 parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
362
363err_free:
364 kfree(data);
365err:
366 return ret;
367}
368
369/*
370 * parse the format type I and III descriptors
371 */
372static int parse_audio_format_i(struct snd_usb_audio *chip,
373 struct audioformat *fp, unsigned int format,
374 struct uac_format_type_i_continuous_descriptor *fmt)
375{
376 snd_pcm_format_t pcm_format;
377 int ret;
378
379 if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
380 /* FIXME: the format type is really IECxxx
381 * but we give normal PCM format to get the existing
382 * apps working...
383 */
384 switch (chip->usb_id) {
385
386 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
387 if (chip->setup == 0x00 &&
388 fp->altsetting == 6)
389 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
390 else
391 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
392 break;
393 default:
394 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
395 }
396 fp->formats = pcm_format_to_bits(pcm_format);
397 } else {
398 fp->formats = parse_audio_format_i_type(chip, fp, format, fmt);
399 if (!fp->formats)
400 return -EINVAL;
401 }
402
403 /* gather possible sample rates */
404 /* audio class v1 reports possible sample rates as part of the
405 * proprietary class specific descriptor.
406 * audio class v2 uses class specific EP0 range requests for that.
407 */
408 switch (fp->protocol) {
409 default:
410 case UAC_VERSION_1:
411 fp->channels = fmt->bNrChannels;
412 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
413 break;
414 case UAC_VERSION_2:
415 /* fp->channels is already set in this case */
416 ret = parse_audio_format_rates_v2(chip, fp);
417 break;
418 }
419
420 if (fp->channels < 1) {
421 usb_audio_err(chip,
422 "%u:%d : invalid channels %d\n",
423 fp->iface, fp->altsetting, fp->channels);
424 return -EINVAL;
425 }
426
427 return ret;
428}
429
430/*
431 * parse the format type II descriptor
432 */
433static int parse_audio_format_ii(struct snd_usb_audio *chip,
434 struct audioformat *fp,
435 int format, void *_fmt)
436{
437 int brate, framesize, ret;
438
439 switch (format) {
440 case UAC_FORMAT_TYPE_II_AC3:
441 /* FIXME: there is no AC3 format defined yet */
442 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
443 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
444 break;
445 case UAC_FORMAT_TYPE_II_MPEG:
446 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
447 break;
448 default:
449 usb_audio_info(chip,
450 "%u:%d : unknown format tag %#x is detected. processed as MPEG.\n",
451 fp->iface, fp->altsetting, format);
452 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
453 break;
454 }
455
456 fp->channels = 1;
457
458 switch (fp->protocol) {
459 default:
460 case UAC_VERSION_1: {
461 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
462 brate = le16_to_cpu(fmt->wMaxBitRate);
463 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
464 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
465 fp->frame_size = framesize;
466 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
467 break;
468 }
469 case UAC_VERSION_2: {
470 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
471 brate = le16_to_cpu(fmt->wMaxBitRate);
472 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
473 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
474 fp->frame_size = framesize;
475 ret = parse_audio_format_rates_v2(chip, fp);
476 break;
477 }
478 }
479
480 return ret;
481}
482
483int snd_usb_parse_audio_format(struct snd_usb_audio *chip,
484 struct audioformat *fp, unsigned int format,
485 struct uac_format_type_i_continuous_descriptor *fmt,
486 int stream)
487{
488 int err;
489
490 switch (fmt->bFormatType) {
491 case UAC_FORMAT_TYPE_I:
492 case UAC_FORMAT_TYPE_III:
493 err = parse_audio_format_i(chip, fp, format, fmt);
494 break;
495 case UAC_FORMAT_TYPE_II:
496 err = parse_audio_format_ii(chip, fp, format, fmt);
497 break;
498 default:
499 usb_audio_info(chip,
500 "%u:%d : format type %d is not supported yet\n",
501 fp->iface, fp->altsetting,
502 fmt->bFormatType);
503 return -ENOTSUPP;
504 }
505 fp->fmt_type = fmt->bFormatType;
506 if (err < 0)
507 return err;
508#if 1
509 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
510 /* extigy apparently supports sample rates other than 48k
511 * but not in ordinary way. so we enable only 48k atm.
512 */
513 if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
514 chip->usb_id == USB_ID(0x041e, 0x3020) ||
515 chip->usb_id == USB_ID(0x041e, 0x3061)) {
516 if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&
517 fp->rates != SNDRV_PCM_RATE_48000 &&
518 fp->rates != SNDRV_PCM_RATE_96000)
519 return -ENOTSUPP;
520 }
521#endif
522 return 0;
523}
524