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 */ 31 static 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 } 154 155 static 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 */ 170 static 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 */ 196 static 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 */ 277 static 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 */ 301 static 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 */ 348 static 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(0x0194f, 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 } 394 395 skip_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 */ 409 static 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, 0x4247): /* Line6 Pod Go */ 418 case USB_ID(0x0e41, 0x4248): /* Line6 Helix >= fw 2.82 */ 419 case USB_ID(0x0e41, 0x4249): /* Line6 Helix Rack >= fw 2.82 */ 420 case USB_ID(0x0e41, 0x424a): /* Line6 Helix LT >= fw 2.82 */ 421 case USB_ID(0x19f7, 0x0011): /* Rode Rodecaster Pro */ 422 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000); 423 } 424 425 return -ENODEV; 426 } 427 428 /* check whether the given altsetting is supported for the already set rate */ 429 static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface, 430 int altsetting) 431 { 432 struct usb_device *dev = chip->dev; 433 __le64 raw_data = 0; 434 u64 data; 435 int err; 436 437 /* we assume 64bit is enough for any altsettings */ 438 if (snd_BUG_ON(altsetting >= 64 - 8)) 439 return false; 440 441 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 442 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 443 UAC2_AS_VAL_ALT_SETTINGS << 8, 444 iface, &raw_data, sizeof(raw_data)); 445 if (err < 0) 446 return false; 447 448 data = le64_to_cpu(raw_data); 449 /* first byte contains the bitmap size */ 450 if ((data & 0xff) * 8 < altsetting) 451 return false; 452 if (data & (1ULL << (altsetting + 8))) 453 return true; 454 455 return false; 456 } 457 458 /* 459 * Validate each sample rate with the altsetting 460 * Rebuild the rate table if only partial values are valid 461 */ 462 static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip, 463 struct audioformat *fp, 464 int clock) 465 { 466 struct usb_device *dev = chip->dev; 467 unsigned int *table; 468 unsigned int nr_rates; 469 int i, err; 470 471 /* performing the rate verification may lead to unexpected USB bus 472 * behavior afterwards by some unknown reason. Do this only for the 473 * known devices. 474 */ 475 if (!(chip->quirk_flags & QUIRK_FLAG_VALIDATE_RATES)) 476 return 0; /* don't perform the validation as default */ 477 478 table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL); 479 if (!table) 480 return -ENOMEM; 481 482 /* clear the interface altsetting at first */ 483 usb_set_interface(dev, fp->iface, 0); 484 485 nr_rates = 0; 486 for (i = 0; i < fp->nr_rates; i++) { 487 err = snd_usb_set_sample_rate_v2v3(chip, fp, clock, 488 fp->rate_table[i]); 489 if (err < 0) 490 continue; 491 492 if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting)) 493 table[nr_rates++] = fp->rate_table[i]; 494 } 495 496 if (!nr_rates) { 497 usb_audio_dbg(chip, 498 "No valid sample rate available for %d:%d, assuming a firmware bug\n", 499 fp->iface, fp->altsetting); 500 nr_rates = fp->nr_rates; /* continue as is */ 501 } 502 503 if (fp->nr_rates == nr_rates) { 504 kfree(table); 505 return 0; 506 } 507 508 kfree(fp->rate_table); 509 fp->rate_table = table; 510 fp->nr_rates = nr_rates; 511 return 0; 512 } 513 514 /* 515 * parse the format descriptor and stores the possible sample rates 516 * on the audioformat table (audio class v2 and v3). 517 */ 518 static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip, 519 struct audioformat *fp) 520 { 521 struct usb_device *dev = chip->dev; 522 unsigned char tmp[2], *data; 523 int nr_triplets, data_size, ret = 0, ret_l6; 524 int clock = snd_usb_clock_find_source(chip, fp, false); 525 526 if (clock < 0) { 527 dev_err(&dev->dev, 528 "%s(): unable to find clock source (clock %d)\n", 529 __func__, clock); 530 goto err; 531 } 532 533 /* get the number of sample rates first by only fetching 2 bytes */ 534 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE, 535 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 536 UAC2_CS_CONTROL_SAM_FREQ << 8, 537 snd_usb_ctrl_intf(chip) | (clock << 8), 538 tmp, sizeof(tmp)); 539 540 if (ret < 0) { 541 /* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */ 542 ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp); 543 if (ret_l6 == -ENODEV) { 544 /* no line6 device found continue showing the error */ 545 dev_err(&dev->dev, 546 "%s(): unable to retrieve number of sample rates (clock %d)\n", 547 __func__, clock); 548 goto err; 549 } 550 if (ret_l6 == 0) { 551 dev_info(&dev->dev, 552 "%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).\n", 553 __func__, clock); 554 return 0; 555 } 556 ret = ret_l6; 557 goto err; 558 } 559 560 nr_triplets = (tmp[1] << 8) | tmp[0]; 561 data_size = 2 + 12 * nr_triplets; 562 data = kzalloc(data_size, GFP_KERNEL); 563 if (!data) { 564 ret = -ENOMEM; 565 goto err; 566 } 567 568 /* now get the full information */ 569 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE, 570 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 571 UAC2_CS_CONTROL_SAM_FREQ << 8, 572 snd_usb_ctrl_intf(chip) | (clock << 8), 573 data, data_size); 574 575 if (ret < 0) { 576 dev_err(&dev->dev, 577 "%s(): unable to retrieve sample rate range (clock %d)\n", 578 __func__, clock); 579 ret = -EINVAL; 580 goto err_free; 581 } 582 583 /* Call the triplet parser, and make sure fp->rate_table is NULL. 584 * We just use the return value to know how many sample rates we 585 * will have to deal with. */ 586 kfree(fp->rate_table); 587 fp->rate_table = NULL; 588 fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data); 589 590 if (fp->nr_rates == 0) { 591 /* SNDRV_PCM_RATE_CONTINUOUS */ 592 ret = 0; 593 goto err_free; 594 } 595 596 fp->rate_table = kmalloc_array(fp->nr_rates, sizeof(int), GFP_KERNEL); 597 if (!fp->rate_table) { 598 ret = -ENOMEM; 599 goto err_free; 600 } 601 602 /* Call the triplet parser again, but this time, fp->rate_table is 603 * allocated, so the rates will be stored */ 604 parse_uac2_sample_rate_range(chip, fp, nr_triplets, data); 605 606 ret = validate_sample_rate_table_v2v3(chip, fp, clock); 607 if (ret < 0) 608 goto err_free; 609 610 set_rate_table_min_max(fp); 611 612 err_free: 613 kfree(data); 614 err: 615 return ret; 616 } 617 618 /* 619 * parse the format type I and III descriptors 620 */ 621 static int parse_audio_format_i(struct snd_usb_audio *chip, 622 struct audioformat *fp, u64 format, 623 void *_fmt) 624 { 625 snd_pcm_format_t pcm_format; 626 unsigned int fmt_type; 627 int ret; 628 629 switch (fp->protocol) { 630 default: 631 case UAC_VERSION_1: 632 case UAC_VERSION_2: { 633 struct uac_format_type_i_continuous_descriptor *fmt = _fmt; 634 635 fmt_type = fmt->bFormatType; 636 break; 637 } 638 case UAC_VERSION_3: { 639 /* fp->fmt_type is already set in this case */ 640 fmt_type = fp->fmt_type; 641 break; 642 } 643 } 644 645 if (fmt_type == UAC_FORMAT_TYPE_III) { 646 /* FIXME: the format type is really IECxxx 647 * but we give normal PCM format to get the existing 648 * apps working... 649 */ 650 switch (chip->usb_id) { 651 652 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */ 653 if (chip->setup == 0x00 && 654 fp->altsetting == 6) 655 pcm_format = SNDRV_PCM_FORMAT_S16_BE; 656 else 657 pcm_format = SNDRV_PCM_FORMAT_S16_LE; 658 break; 659 default: 660 pcm_format = SNDRV_PCM_FORMAT_S16_LE; 661 } 662 fp->formats = pcm_format_to_bits(pcm_format); 663 } else { 664 fp->formats = parse_audio_format_i_type(chip, fp, format, _fmt); 665 if (!fp->formats) 666 return -EINVAL; 667 } 668 669 /* gather possible sample rates */ 670 /* audio class v1 reports possible sample rates as part of the 671 * proprietary class specific descriptor. 672 * audio class v2 uses class specific EP0 range requests for that. 673 */ 674 switch (fp->protocol) { 675 default: 676 case UAC_VERSION_1: { 677 struct uac_format_type_i_continuous_descriptor *fmt = _fmt; 678 679 fp->channels = fmt->bNrChannels; 680 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7); 681 break; 682 } 683 case UAC_VERSION_2: 684 case UAC_VERSION_3: { 685 /* fp->channels is already set in this case */ 686 ret = parse_audio_format_rates_v2v3(chip, fp); 687 break; 688 } 689 } 690 691 if (fp->channels < 1) { 692 usb_audio_err(chip, 693 "%u:%d : invalid channels %d\n", 694 fp->iface, fp->altsetting, fp->channels); 695 return -EINVAL; 696 } 697 698 return ret; 699 } 700 701 /* 702 * parse the format type II descriptor 703 */ 704 static int parse_audio_format_ii(struct snd_usb_audio *chip, 705 struct audioformat *fp, 706 u64 format, void *_fmt) 707 { 708 int brate, framesize, ret; 709 710 switch (format) { 711 case UAC_FORMAT_TYPE_II_AC3: 712 /* FIXME: there is no AC3 format defined yet */ 713 // fp->formats = SNDRV_PCM_FMTBIT_AC3; 714 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */ 715 break; 716 case UAC_FORMAT_TYPE_II_MPEG: 717 fp->formats = SNDRV_PCM_FMTBIT_MPEG; 718 break; 719 default: 720 usb_audio_info(chip, 721 "%u:%d : unknown format tag %#llx is detected. processed as MPEG.\n", 722 fp->iface, fp->altsetting, format); 723 fp->formats = SNDRV_PCM_FMTBIT_MPEG; 724 break; 725 } 726 727 fp->channels = 1; 728 729 switch (fp->protocol) { 730 default: 731 case UAC_VERSION_1: { 732 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt; 733 brate = le16_to_cpu(fmt->wMaxBitRate); 734 framesize = le16_to_cpu(fmt->wSamplesPerFrame); 735 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize); 736 fp->frame_size = framesize; 737 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */ 738 break; 739 } 740 case UAC_VERSION_2: { 741 struct uac_format_type_ii_ext_descriptor *fmt = _fmt; 742 brate = le16_to_cpu(fmt->wMaxBitRate); 743 framesize = le16_to_cpu(fmt->wSamplesPerFrame); 744 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize); 745 fp->frame_size = framesize; 746 ret = parse_audio_format_rates_v2v3(chip, fp); 747 break; 748 } 749 } 750 751 return ret; 752 } 753 754 int snd_usb_parse_audio_format(struct snd_usb_audio *chip, 755 struct audioformat *fp, u64 format, 756 struct uac_format_type_i_continuous_descriptor *fmt, 757 int stream) 758 { 759 int err; 760 761 switch (fmt->bFormatType) { 762 case UAC_FORMAT_TYPE_I: 763 case UAC_FORMAT_TYPE_III: 764 err = parse_audio_format_i(chip, fp, format, fmt); 765 break; 766 case UAC_FORMAT_TYPE_II: 767 err = parse_audio_format_ii(chip, fp, format, fmt); 768 break; 769 default: 770 usb_audio_info(chip, 771 "%u:%d : format type %d is not supported yet\n", 772 fp->iface, fp->altsetting, 773 fmt->bFormatType); 774 return -ENOTSUPP; 775 } 776 fp->fmt_type = fmt->bFormatType; 777 if (err < 0) 778 return err; 779 #if 1 780 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */ 781 /* extigy apparently supports sample rates other than 48k 782 * but not in ordinary way. so we enable only 48k atm. 783 */ 784 if (chip->usb_id == USB_ID(0x041e, 0x3000) || 785 chip->usb_id == USB_ID(0x041e, 0x3020) || 786 chip->usb_id == USB_ID(0x041e, 0x3061)) { 787 if (fmt->bFormatType == UAC_FORMAT_TYPE_I && 788 fp->rates != SNDRV_PCM_RATE_48000 && 789 fp->rates != SNDRV_PCM_RATE_96000) 790 return -ENOTSUPP; 791 } 792 #endif 793 return 0; 794 } 795 796 int snd_usb_parse_audio_format_v3(struct snd_usb_audio *chip, 797 struct audioformat *fp, 798 struct uac3_as_header_descriptor *as, 799 int stream) 800 { 801 u64 format = le64_to_cpu(as->bmFormats); 802 int err; 803 804 /* 805 * Type I format bits are D0..D6 806 * This test works because type IV is not supported 807 */ 808 if (format & 0x7f) 809 fp->fmt_type = UAC_FORMAT_TYPE_I; 810 else 811 fp->fmt_type = UAC_FORMAT_TYPE_III; 812 813 err = parse_audio_format_i(chip, fp, format, as); 814 if (err < 0) 815 return err; 816 817 return 0; 818 } 819