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 if (rate == 48000 && nr_rates == 1 && 227 (chip->usb_id == USB_ID(0x0d8c, 0x0201) || 228 chip->usb_id == USB_ID(0x0d8c, 0x0102) || 229 chip->usb_id == USB_ID(0x0ccd, 0x00b1)) && 230 fp->altsetting == 5 && fp->maxpacksize == 392) 231 rate = 96000; 232 /* Creative VF0420/VF0470 Live Cams report 16 kHz instead of 8kHz */ 233 if (rate == 16000 && 234 (chip->usb_id == USB_ID(0x041e, 0x4064) || 235 chip->usb_id == USB_ID(0x041e, 0x4068))) 236 rate = 8000; 237 238 fp->rate_table[fp->nr_rates++] = rate; 239 } 240 if (!fp->nr_rates) { 241 usb_audio_info(chip, 242 "%u:%d: All rates were zero\n", 243 fp->iface, fp->altsetting); 244 return -EINVAL; 245 } 246 set_rate_table_min_max(fp); 247 } else { 248 /* continuous rates */ 249 fp->rates = SNDRV_PCM_RATE_CONTINUOUS; 250 fp->rate_min = combine_triple(&fmt[offset + 1]); 251 fp->rate_max = combine_triple(&fmt[offset + 4]); 252 } 253 254 /* Jabra Evolve 65 headset */ 255 if (chip->usb_id == USB_ID(0x0b0e, 0x030b)) { 256 /* only 48kHz for playback while keeping 16kHz for capture */ 257 if (fp->nr_rates != 1) 258 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000); 259 } 260 261 return 0; 262 } 263 264 265 /* 266 * Presonus Studio 1810c supports a limited set of sampling 267 * rates per altsetting but reports the full set each time. 268 * If we don't filter out the unsupported rates and attempt 269 * to configure the card, it will hang refusing to do any 270 * further audio I/O until a hard reset is performed. 271 * 272 * The list of supported rates per altsetting (set of available 273 * I/O channels) is described in the owner's manual, section 2.2. 274 */ 275 static bool s1810c_valid_sample_rate(struct audioformat *fp, 276 unsigned int rate) 277 { 278 switch (fp->altsetting) { 279 case 1: 280 /* All ADAT ports available */ 281 return rate <= 48000; 282 case 2: 283 /* Half of ADAT ports available */ 284 return (rate == 88200 || rate == 96000); 285 case 3: 286 /* Analog I/O only (no S/PDIF nor ADAT) */ 287 return rate >= 176400; 288 default: 289 return false; 290 } 291 return false; 292 } 293 294 /* 295 * Many Focusrite devices supports a limited set of sampling rates per 296 * altsetting. Maximum rate is exposed in the last 4 bytes of Format Type 297 * descriptor which has a non-standard bLength = 10. 298 */ 299 static bool focusrite_valid_sample_rate(struct snd_usb_audio *chip, 300 struct audioformat *fp, 301 unsigned int rate) 302 { 303 struct usb_interface *iface; 304 struct usb_host_interface *alts; 305 unsigned char *fmt; 306 unsigned int max_rate; 307 308 iface = usb_ifnum_to_if(chip->dev, fp->iface); 309 if (!iface) 310 return true; 311 312 alts = &iface->altsetting[fp->altset_idx]; 313 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, 314 NULL, UAC_FORMAT_TYPE); 315 if (!fmt) 316 return true; 317 318 if (fmt[0] == 10) { /* bLength */ 319 max_rate = combine_quad(&fmt[6]); 320 321 /* Validate max rate */ 322 if (max_rate != 48000 && 323 max_rate != 96000 && 324 max_rate != 192000 && 325 max_rate != 384000) { 326 327 usb_audio_info(chip, 328 "%u:%d : unexpected max rate: %u\n", 329 fp->iface, fp->altsetting, max_rate); 330 331 return true; 332 } 333 334 return rate <= max_rate; 335 } 336 337 return true; 338 } 339 340 /* 341 * Helper function to walk the array of sample rate triplets reported by 342 * the device. The problem is that we need to parse whole array first to 343 * get to know how many sample rates we have to expect. 344 * Then fp->rate_table can be allocated and filled. 345 */ 346 static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip, 347 struct audioformat *fp, int nr_triplets, 348 const unsigned char *data) 349 { 350 int i, nr_rates = 0; 351 352 for (i = 0; i < nr_triplets; i++) { 353 int min = combine_quad(&data[2 + 12 * i]); 354 int max = combine_quad(&data[6 + 12 * i]); 355 int res = combine_quad(&data[10 + 12 * i]); 356 unsigned int rate; 357 358 if ((max < 0) || (min < 0) || (res < 0) || (max < min)) 359 continue; 360 361 /* 362 * for ranges with res == 1, we announce a continuous sample 363 * rate range, and this function should return 0 for no further 364 * parsing. 365 */ 366 if (res == 1) { 367 fp->rate_min = min; 368 fp->rate_max = max; 369 fp->rates = SNDRV_PCM_RATE_CONTINUOUS; 370 return 0; 371 } 372 373 for (rate = min; rate <= max; rate += res) { 374 375 /* Filter out invalid rates on Presonus Studio 1810c */ 376 if (chip->usb_id == USB_ID(0x0194f, 0x010c) && 377 !s1810c_valid_sample_rate(fp, rate)) 378 goto skip_rate; 379 380 /* Filter out invalid rates on Focusrite devices */ 381 if (USB_ID_VENDOR(chip->usb_id) == 0x1235 && 382 !focusrite_valid_sample_rate(chip, fp, rate)) 383 goto skip_rate; 384 385 if (fp->rate_table) 386 fp->rate_table[nr_rates] = rate; 387 nr_rates++; 388 if (nr_rates >= MAX_NR_RATES) { 389 usb_audio_err(chip, "invalid uac2 rates\n"); 390 break; 391 } 392 393 skip_rate: 394 /* avoid endless loop */ 395 if (res == 0) 396 break; 397 } 398 } 399 400 return nr_rates; 401 } 402 403 /* Line6 Helix series and the Rode Rodecaster Pro don't support the 404 * UAC2_CS_RANGE usb function call. Return a static table of known 405 * clock rates. 406 */ 407 static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip, 408 struct audioformat *fp) 409 { 410 switch (chip->usb_id) { 411 case USB_ID(0x0e41, 0x4241): /* Line6 Helix */ 412 case USB_ID(0x0e41, 0x4242): /* Line6 Helix Rack */ 413 case USB_ID(0x0e41, 0x4244): /* Line6 Helix LT */ 414 case USB_ID(0x0e41, 0x4246): /* Line6 HX-Stomp */ 415 case USB_ID(0x0e41, 0x4247): /* Line6 Pod Go */ 416 case USB_ID(0x0e41, 0x4248): /* Line6 Helix >= fw 2.82 */ 417 case USB_ID(0x0e41, 0x4249): /* Line6 Helix Rack >= fw 2.82 */ 418 case USB_ID(0x0e41, 0x424a): /* Line6 Helix LT >= fw 2.82 */ 419 case USB_ID(0x19f7, 0x0011): /* Rode Rodecaster Pro */ 420 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000); 421 } 422 423 return -ENODEV; 424 } 425 426 /* check whether the given altsetting is supported for the already set rate */ 427 static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface, 428 int altsetting) 429 { 430 struct usb_device *dev = chip->dev; 431 __le64 raw_data = 0; 432 u64 data; 433 int err; 434 435 /* we assume 64bit is enough for any altsettings */ 436 if (snd_BUG_ON(altsetting >= 64 - 8)) 437 return false; 438 439 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 440 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 441 UAC2_AS_VAL_ALT_SETTINGS << 8, 442 iface, &raw_data, sizeof(raw_data)); 443 if (err < 0) 444 return false; 445 446 data = le64_to_cpu(raw_data); 447 /* first byte contains the bitmap size */ 448 if ((data & 0xff) * 8 < altsetting) 449 return false; 450 if (data & (1ULL << (altsetting + 8))) 451 return true; 452 453 return false; 454 } 455 456 /* 457 * Validate each sample rate with the altsetting 458 * Rebuild the rate table if only partial values are valid 459 */ 460 static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip, 461 struct audioformat *fp, 462 int clock) 463 { 464 struct usb_device *dev = chip->dev; 465 unsigned int *table; 466 unsigned int nr_rates; 467 int i, err; 468 469 /* performing the rate verification may lead to unexpected USB bus 470 * behavior afterwards by some unknown reason. Do this only for the 471 * known devices. 472 */ 473 switch (USB_ID_VENDOR(chip->usb_id)) { 474 case 0x07fd: /* MOTU */ 475 break; 476 default: 477 return 0; /* don't perform the validation as default */ 478 } 479 480 table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL); 481 if (!table) 482 return -ENOMEM; 483 484 /* clear the interface altsetting at first */ 485 usb_set_interface(dev, fp->iface, 0); 486 487 nr_rates = 0; 488 for (i = 0; i < fp->nr_rates; i++) { 489 err = snd_usb_set_sample_rate_v2v3(chip, fp, clock, 490 fp->rate_table[i]); 491 if (err < 0) 492 continue; 493 494 if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting)) 495 table[nr_rates++] = fp->rate_table[i]; 496 } 497 498 if (!nr_rates) { 499 usb_audio_dbg(chip, 500 "No valid sample rate available for %d:%d, assuming a firmware bug\n", 501 fp->iface, fp->altsetting); 502 nr_rates = fp->nr_rates; /* continue as is */ 503 } 504 505 if (fp->nr_rates == nr_rates) { 506 kfree(table); 507 return 0; 508 } 509 510 kfree(fp->rate_table); 511 fp->rate_table = table; 512 fp->nr_rates = nr_rates; 513 return 0; 514 } 515 516 /* 517 * parse the format descriptor and stores the possible sample rates 518 * on the audioformat table (audio class v2 and v3). 519 */ 520 static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip, 521 struct audioformat *fp) 522 { 523 struct usb_device *dev = chip->dev; 524 unsigned char tmp[2], *data; 525 int nr_triplets, data_size, ret = 0, ret_l6; 526 int clock = snd_usb_clock_find_source(chip, fp, false); 527 528 if (clock < 0) { 529 dev_err(&dev->dev, 530 "%s(): unable to find clock source (clock %d)\n", 531 __func__, clock); 532 goto err; 533 } 534 535 /* get the number of sample rates first by only fetching 2 bytes */ 536 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE, 537 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 538 UAC2_CS_CONTROL_SAM_FREQ << 8, 539 snd_usb_ctrl_intf(chip) | (clock << 8), 540 tmp, sizeof(tmp)); 541 542 if (ret < 0) { 543 /* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */ 544 ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp); 545 if (ret_l6 == -ENODEV) { 546 /* no line6 device found continue showing the error */ 547 dev_err(&dev->dev, 548 "%s(): unable to retrieve number of sample rates (clock %d)\n", 549 __func__, clock); 550 goto err; 551 } 552 if (ret_l6 == 0) { 553 dev_info(&dev->dev, 554 "%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).\n", 555 __func__, clock); 556 return 0; 557 } 558 ret = ret_l6; 559 goto err; 560 } 561 562 nr_triplets = (tmp[1] << 8) | tmp[0]; 563 data_size = 2 + 12 * nr_triplets; 564 data = kzalloc(data_size, GFP_KERNEL); 565 if (!data) { 566 ret = -ENOMEM; 567 goto err; 568 } 569 570 /* now get the full information */ 571 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE, 572 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 573 UAC2_CS_CONTROL_SAM_FREQ << 8, 574 snd_usb_ctrl_intf(chip) | (clock << 8), 575 data, data_size); 576 577 if (ret < 0) { 578 dev_err(&dev->dev, 579 "%s(): unable to retrieve sample rate range (clock %d)\n", 580 __func__, clock); 581 ret = -EINVAL; 582 goto err_free; 583 } 584 585 /* Call the triplet parser, and make sure fp->rate_table is NULL. 586 * We just use the return value to know how many sample rates we 587 * will have to deal with. */ 588 kfree(fp->rate_table); 589 fp->rate_table = NULL; 590 fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data); 591 592 if (fp->nr_rates == 0) { 593 /* SNDRV_PCM_RATE_CONTINUOUS */ 594 ret = 0; 595 goto err_free; 596 } 597 598 fp->rate_table = kmalloc_array(fp->nr_rates, sizeof(int), GFP_KERNEL); 599 if (!fp->rate_table) { 600 ret = -ENOMEM; 601 goto err_free; 602 } 603 604 /* Call the triplet parser again, but this time, fp->rate_table is 605 * allocated, so the rates will be stored */ 606 parse_uac2_sample_rate_range(chip, fp, nr_triplets, data); 607 608 ret = validate_sample_rate_table_v2v3(chip, fp, clock); 609 if (ret < 0) 610 goto err_free; 611 612 set_rate_table_min_max(fp); 613 614 err_free: 615 kfree(data); 616 err: 617 return ret; 618 } 619 620 /* 621 * parse the format type I and III descriptors 622 */ 623 static int parse_audio_format_i(struct snd_usb_audio *chip, 624 struct audioformat *fp, u64 format, 625 void *_fmt) 626 { 627 snd_pcm_format_t pcm_format; 628 unsigned int fmt_type; 629 int ret; 630 631 switch (fp->protocol) { 632 default: 633 case UAC_VERSION_1: 634 case UAC_VERSION_2: { 635 struct uac_format_type_i_continuous_descriptor *fmt = _fmt; 636 637 fmt_type = fmt->bFormatType; 638 break; 639 } 640 case UAC_VERSION_3: { 641 /* fp->fmt_type is already set in this case */ 642 fmt_type = fp->fmt_type; 643 break; 644 } 645 } 646 647 if (fmt_type == UAC_FORMAT_TYPE_III) { 648 /* FIXME: the format type is really IECxxx 649 * but we give normal PCM format to get the existing 650 * apps working... 651 */ 652 switch (chip->usb_id) { 653 654 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */ 655 if (chip->setup == 0x00 && 656 fp->altsetting == 6) 657 pcm_format = SNDRV_PCM_FORMAT_S16_BE; 658 else 659 pcm_format = SNDRV_PCM_FORMAT_S16_LE; 660 break; 661 default: 662 pcm_format = SNDRV_PCM_FORMAT_S16_LE; 663 } 664 fp->formats = pcm_format_to_bits(pcm_format); 665 } else { 666 fp->formats = parse_audio_format_i_type(chip, fp, format, _fmt); 667 if (!fp->formats) 668 return -EINVAL; 669 } 670 671 /* gather possible sample rates */ 672 /* audio class v1 reports possible sample rates as part of the 673 * proprietary class specific descriptor. 674 * audio class v2 uses class specific EP0 range requests for that. 675 */ 676 switch (fp->protocol) { 677 default: 678 case UAC_VERSION_1: { 679 struct uac_format_type_i_continuous_descriptor *fmt = _fmt; 680 681 fp->channels = fmt->bNrChannels; 682 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7); 683 break; 684 } 685 case UAC_VERSION_2: 686 case UAC_VERSION_3: { 687 /* fp->channels is already set in this case */ 688 ret = parse_audio_format_rates_v2v3(chip, fp); 689 break; 690 } 691 } 692 693 if (fp->channels < 1) { 694 usb_audio_err(chip, 695 "%u:%d : invalid channels %d\n", 696 fp->iface, fp->altsetting, fp->channels); 697 return -EINVAL; 698 } 699 700 return ret; 701 } 702 703 /* 704 * parse the format type II descriptor 705 */ 706 static int parse_audio_format_ii(struct snd_usb_audio *chip, 707 struct audioformat *fp, 708 u64 format, void *_fmt) 709 { 710 int brate, framesize, ret; 711 712 switch (format) { 713 case UAC_FORMAT_TYPE_II_AC3: 714 /* FIXME: there is no AC3 format defined yet */ 715 // fp->formats = SNDRV_PCM_FMTBIT_AC3; 716 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */ 717 break; 718 case UAC_FORMAT_TYPE_II_MPEG: 719 fp->formats = SNDRV_PCM_FMTBIT_MPEG; 720 break; 721 default: 722 usb_audio_info(chip, 723 "%u:%d : unknown format tag %#llx is detected. processed as MPEG.\n", 724 fp->iface, fp->altsetting, format); 725 fp->formats = SNDRV_PCM_FMTBIT_MPEG; 726 break; 727 } 728 729 fp->channels = 1; 730 731 switch (fp->protocol) { 732 default: 733 case UAC_VERSION_1: { 734 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt; 735 brate = le16_to_cpu(fmt->wMaxBitRate); 736 framesize = le16_to_cpu(fmt->wSamplesPerFrame); 737 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize); 738 fp->frame_size = framesize; 739 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */ 740 break; 741 } 742 case UAC_VERSION_2: { 743 struct uac_format_type_ii_ext_descriptor *fmt = _fmt; 744 brate = le16_to_cpu(fmt->wMaxBitRate); 745 framesize = le16_to_cpu(fmt->wSamplesPerFrame); 746 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize); 747 fp->frame_size = framesize; 748 ret = parse_audio_format_rates_v2v3(chip, fp); 749 break; 750 } 751 } 752 753 return ret; 754 } 755 756 int snd_usb_parse_audio_format(struct snd_usb_audio *chip, 757 struct audioformat *fp, u64 format, 758 struct uac_format_type_i_continuous_descriptor *fmt, 759 int stream) 760 { 761 int err; 762 763 switch (fmt->bFormatType) { 764 case UAC_FORMAT_TYPE_I: 765 case UAC_FORMAT_TYPE_III: 766 err = parse_audio_format_i(chip, fp, format, fmt); 767 break; 768 case UAC_FORMAT_TYPE_II: 769 err = parse_audio_format_ii(chip, fp, format, fmt); 770 break; 771 default: 772 usb_audio_info(chip, 773 "%u:%d : format type %d is not supported yet\n", 774 fp->iface, fp->altsetting, 775 fmt->bFormatType); 776 return -ENOTSUPP; 777 } 778 fp->fmt_type = fmt->bFormatType; 779 if (err < 0) 780 return err; 781 #if 1 782 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */ 783 /* extigy apparently supports sample rates other than 48k 784 * but not in ordinary way. so we enable only 48k atm. 785 */ 786 if (chip->usb_id == USB_ID(0x041e, 0x3000) || 787 chip->usb_id == USB_ID(0x041e, 0x3020) || 788 chip->usb_id == USB_ID(0x041e, 0x3061)) { 789 if (fmt->bFormatType == UAC_FORMAT_TYPE_I && 790 fp->rates != SNDRV_PCM_RATE_48000 && 791 fp->rates != SNDRV_PCM_RATE_96000) 792 return -ENOTSUPP; 793 } 794 #endif 795 return 0; 796 } 797 798 int snd_usb_parse_audio_format_v3(struct snd_usb_audio *chip, 799 struct audioformat *fp, 800 struct uac3_as_header_descriptor *as, 801 int stream) 802 { 803 u64 format = le64_to_cpu(as->bmFormats); 804 int err; 805 806 /* 807 * Type I format bits are D0..D6 808 * This test works because type IV is not supported 809 */ 810 if (format & 0x7f) 811 fp->fmt_type = UAC_FORMAT_TYPE_I; 812 else 813 fp->fmt_type = UAC_FORMAT_TYPE_III; 814 815 err = parse_audio_format_i(chip, fp, format, as); 816 if (err < 0) 817 return err; 818 819 return 0; 820 } 821