1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Clock domain and sample rate management functions 4 */ 5 6 #include <linux/bitops.h> 7 #include <linux/init.h> 8 #include <linux/string.h> 9 #include <linux/usb.h> 10 #include <linux/usb/audio.h> 11 #include <linux/usb/audio-v2.h> 12 #include <linux/usb/audio-v3.h> 13 14 #include <sound/core.h> 15 #include <sound/info.h> 16 #include <sound/pcm.h> 17 18 #include "usbaudio.h" 19 #include "card.h" 20 #include "helper.h" 21 #include "clock.h" 22 #include "quirks.h" 23 24 union uac23_clock_source_desc { 25 struct uac_clock_source_descriptor v2; 26 struct uac3_clock_source_descriptor v3; 27 }; 28 29 union uac23_clock_selector_desc { 30 struct uac_clock_selector_descriptor v2; 31 struct uac3_clock_selector_descriptor v3; 32 }; 33 34 union uac23_clock_multiplier_desc { 35 struct uac_clock_multiplier_descriptor v2; 36 struct uac_clock_multiplier_descriptor v3; 37 }; 38 39 /* check whether the descriptor bLength has the minimal length */ 40 #define DESC_LENGTH_CHECK(p, proto) \ 41 ((proto) == UAC_VERSION_3 ? \ 42 ((p)->v3.bLength >= sizeof((p)->v3)) : \ 43 ((p)->v2.bLength >= sizeof((p)->v2))) 44 45 #define GET_VAL(p, proto, field) \ 46 ((proto) == UAC_VERSION_3 ? (p)->v3.field : (p)->v2.field) 47 48 static void *find_uac_clock_desc(struct usb_host_interface *iface, int id, 49 bool (*validator)(void *, int, int), 50 u8 type, int proto) 51 { 52 void *cs = NULL; 53 54 while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen, 55 cs, type))) { 56 if (validator(cs, id, proto)) 57 return cs; 58 } 59 60 return NULL; 61 } 62 63 static bool validate_clock_source(void *p, int id, int proto) 64 { 65 union uac23_clock_source_desc *cs = p; 66 67 if (!DESC_LENGTH_CHECK(cs, proto)) 68 return false; 69 return GET_VAL(cs, proto, bClockID) == id; 70 } 71 72 static bool validate_clock_selector(void *p, int id, int proto) 73 { 74 union uac23_clock_selector_desc *cs = p; 75 76 if (!DESC_LENGTH_CHECK(cs, proto)) 77 return false; 78 if (GET_VAL(cs, proto, bClockID) != id) 79 return false; 80 /* additional length check for baCSourceID array (in bNrInPins size) 81 * and two more fields (which sizes depend on the protocol) 82 */ 83 if (proto == UAC_VERSION_3) 84 return cs->v3.bLength >= sizeof(cs->v3) + cs->v3.bNrInPins + 85 4 /* bmControls */ + 2 /* wCSelectorDescrStr */; 86 else 87 return cs->v2.bLength >= sizeof(cs->v2) + cs->v2.bNrInPins + 88 1 /* bmControls */ + 1 /* iClockSelector */; 89 } 90 91 static bool validate_clock_multiplier(void *p, int id, int proto) 92 { 93 union uac23_clock_multiplier_desc *cs = p; 94 95 if (!DESC_LENGTH_CHECK(cs, proto)) 96 return false; 97 return GET_VAL(cs, proto, bClockID) == id; 98 } 99 100 #define DEFINE_FIND_HELPER(name, obj, validator, type2, type3) \ 101 static obj *name(struct snd_usb_audio *chip, int id, \ 102 const struct audioformat *fmt) \ 103 { \ 104 struct usb_host_interface *ctrl_intf = \ 105 snd_usb_find_ctrl_interface(chip, fmt->iface); \ 106 return find_uac_clock_desc(ctrl_intf, id, validator, \ 107 fmt->protocol == UAC_VERSION_3 ? (type3) : (type2), \ 108 fmt->protocol); \ 109 } 110 111 DEFINE_FIND_HELPER(snd_usb_find_clock_source, 112 union uac23_clock_source_desc, validate_clock_source, 113 UAC2_CLOCK_SOURCE, UAC3_CLOCK_SOURCE); 114 DEFINE_FIND_HELPER(snd_usb_find_clock_selector, 115 union uac23_clock_selector_desc, validate_clock_selector, 116 UAC2_CLOCK_SELECTOR, UAC3_CLOCK_SELECTOR); 117 DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier, 118 union uac23_clock_multiplier_desc, validate_clock_multiplier, 119 UAC2_CLOCK_MULTIPLIER, UAC3_CLOCK_MULTIPLIER); 120 121 static int uac_clock_selector_get_val(struct snd_usb_audio *chip, 122 int selector_id, int iface_no) 123 { 124 struct usb_host_interface *ctrl_intf; 125 unsigned char buf; 126 int ret; 127 128 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no); 129 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), 130 UAC2_CS_CUR, 131 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN, 132 UAC2_CX_CLOCK_SELECTOR << 8, 133 snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8), 134 &buf, sizeof(buf)); 135 136 if (ret < 0) 137 return ret; 138 139 return buf; 140 } 141 142 static int uac_clock_selector_set_val(struct snd_usb_audio *chip, 143 int selector_id, unsigned char pin, int iface_no) 144 { 145 struct usb_host_interface *ctrl_intf; 146 int ret; 147 148 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no); 149 ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), 150 UAC2_CS_CUR, 151 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT, 152 UAC2_CX_CLOCK_SELECTOR << 8, 153 snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8), 154 &pin, sizeof(pin)); 155 if (ret < 0) 156 return ret; 157 158 if (ret != sizeof(pin)) { 159 usb_audio_err(chip, 160 "setting selector (id %d) unexpected length %d\n", 161 selector_id, ret); 162 return -EINVAL; 163 } 164 165 ret = uac_clock_selector_get_val(chip, selector_id, iface_no); 166 if (ret < 0) 167 return ret; 168 169 if (ret != pin) { 170 usb_audio_err(chip, 171 "setting selector (id %d) to %x failed (current: %d)\n", 172 selector_id, pin, ret); 173 return -EINVAL; 174 } 175 176 return ret; 177 } 178 179 static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, 180 const struct audioformat *fmt, 181 int source_id) 182 { 183 bool ret = false; 184 int count; 185 unsigned char data; 186 struct usb_device *dev = chip->dev; 187 union uac23_clock_source_desc *cs_desc; 188 struct usb_host_interface *ctrl_intf; 189 190 ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); 191 cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); 192 if (!cs_desc) 193 return false; 194 195 if (fmt->protocol == UAC_VERSION_2) { 196 /* 197 * Assume the clock is valid if clock source supports only one 198 * single sample rate, the terminal is connected directly to it 199 * (there is no clock selector) and clock type is internal. 200 * This is to deal with some Denon DJ controllers that always 201 * reports that clock is invalid. 202 */ 203 if (fmt->nr_rates == 1 && 204 (fmt->clock & 0xff) == cs_desc->v2.bClockID && 205 (cs_desc->v2.bmAttributes & 0x3) != 206 UAC_CLOCK_SOURCE_TYPE_EXT) 207 return true; 208 } 209 210 /* 211 * MOTU MicroBook IIc 212 * Sample rate changes takes more than 2 seconds for this device. Clock 213 * validity request returns false during that period. 214 */ 215 if (chip->usb_id == USB_ID(0x07fd, 0x0004)) { 216 count = 0; 217 218 while ((!ret) && (count < 50)) { 219 int err; 220 221 msleep(100); 222 223 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 224 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 225 UAC2_CS_CONTROL_CLOCK_VALID << 8, 226 snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), 227 &data, sizeof(data)); 228 if (err < 0) { 229 dev_warn(&dev->dev, 230 "%s(): cannot get clock validity for id %d\n", 231 __func__, source_id); 232 return false; 233 } 234 235 ret = !!data; 236 count++; 237 } 238 } 239 240 return ret; 241 } 242 243 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, 244 const struct audioformat *fmt, 245 int source_id) 246 { 247 int err; 248 unsigned char data; 249 struct usb_device *dev = chip->dev; 250 u32 bmControls; 251 union uac23_clock_source_desc *cs_desc; 252 struct usb_host_interface *ctrl_intf; 253 254 ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); 255 cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); 256 if (!cs_desc) 257 return false; 258 259 if (fmt->protocol == UAC_VERSION_3) 260 bmControls = le32_to_cpu(cs_desc->v3.bmControls); 261 else 262 bmControls = cs_desc->v2.bmControls; 263 264 /* If a clock source can't tell us whether it's valid, we assume it is */ 265 if (!uac_v2v3_control_is_readable(bmControls, 266 UAC2_CS_CONTROL_CLOCK_VALID)) 267 return true; 268 269 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 270 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 271 UAC2_CS_CONTROL_CLOCK_VALID << 8, 272 snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), 273 &data, sizeof(data)); 274 275 if (err < 0) { 276 dev_warn(&dev->dev, 277 "%s(): cannot get clock validity for id %d\n", 278 __func__, source_id); 279 return false; 280 } 281 282 if (data) 283 return true; 284 else 285 return uac_clock_source_is_valid_quirk(chip, fmt, source_id); 286 } 287 288 static int __uac_clock_find_source(struct snd_usb_audio *chip, 289 const struct audioformat *fmt, int entity_id, 290 unsigned long *visited, bool validate) 291 { 292 union uac23_clock_source_desc *source; 293 union uac23_clock_selector_desc *selector; 294 union uac23_clock_multiplier_desc *multiplier; 295 int ret, i, cur, err, pins, clock_id; 296 const u8 *sources; 297 int proto = fmt->protocol; 298 bool readable, writeable; 299 u32 bmControls; 300 301 entity_id &= 0xff; 302 303 if (test_and_set_bit(entity_id, visited)) { 304 usb_audio_warn(chip, 305 "%s(): recursive clock topology detected, id %d.\n", 306 __func__, entity_id); 307 return -EINVAL; 308 } 309 310 /* first, see if the ID we're looking at is a clock source already */ 311 source = snd_usb_find_clock_source(chip, entity_id, fmt); 312 if (source) { 313 entity_id = GET_VAL(source, proto, bClockID); 314 if (validate && !uac_clock_source_is_valid(chip, fmt, 315 entity_id)) { 316 usb_audio_err(chip, 317 "clock source %d is not valid, cannot use\n", 318 entity_id); 319 return -ENXIO; 320 } 321 return entity_id; 322 } 323 324 selector = snd_usb_find_clock_selector(chip, entity_id, fmt); 325 if (selector) { 326 pins = GET_VAL(selector, proto, bNrInPins); 327 clock_id = GET_VAL(selector, proto, bClockID); 328 sources = GET_VAL(selector, proto, baCSourceID); 329 cur = 0; 330 331 if (proto == UAC_VERSION_3) 332 bmControls = le32_to_cpu(*(__le32 *)(&selector->v3.baCSourceID[0] + pins)); 333 else 334 bmControls = *(__u8 *)(&selector->v2.baCSourceID[0] + pins); 335 336 readable = uac_v2v3_control_is_readable(bmControls, 337 UAC2_CX_CLOCK_SELECTOR); 338 writeable = uac_v2v3_control_is_writeable(bmControls, 339 UAC2_CX_CLOCK_SELECTOR); 340 341 if (pins == 1) { 342 ret = 1; 343 goto find_source; 344 } 345 346 /* for now just warn about buggy device */ 347 if (!readable) 348 usb_audio_warn(chip, 349 "%s(): clock selector control is not readable, id %d\n", 350 __func__, clock_id); 351 352 /* the entity ID we are looking at is a selector. 353 * find out what it currently selects */ 354 ret = uac_clock_selector_get_val(chip, clock_id, fmt->iface); 355 if (ret < 0) { 356 if (!chip->autoclock) 357 return ret; 358 goto find_others; 359 } 360 361 /* Selector values are one-based */ 362 363 if (ret > pins || ret < 1) { 364 usb_audio_err(chip, 365 "%s(): selector reported illegal value, id %d, ret %d\n", 366 __func__, clock_id, ret); 367 368 if (!chip->autoclock) 369 return -EINVAL; 370 goto find_others; 371 } 372 373 find_source: 374 cur = ret; 375 ret = __uac_clock_find_source(chip, fmt, 376 sources[ret - 1], 377 visited, validate); 378 if (ret > 0) { 379 /* Skip setting clock selector again for some devices */ 380 if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR || 381 !writeable) 382 return ret; 383 err = uac_clock_selector_set_val(chip, entity_id, cur, fmt->iface); 384 if (err < 0) { 385 if (pins == 1) { 386 usb_audio_dbg(chip, 387 "%s(): selector returned an error, " 388 "assuming a firmware bug, id %d, ret %d\n", 389 __func__, clock_id, err); 390 return ret; 391 } 392 return err; 393 } 394 } 395 396 if (!validate || ret > 0 || !chip->autoclock) 397 return ret; 398 399 find_others: 400 if (!writeable) 401 return -ENXIO; 402 403 /* The current clock source is invalid, try others. */ 404 for (i = 1; i <= pins; i++) { 405 if (i == cur) 406 continue; 407 408 ret = __uac_clock_find_source(chip, fmt, 409 sources[i - 1], 410 visited, true); 411 if (ret < 0) 412 continue; 413 414 err = uac_clock_selector_set_val(chip, entity_id, i, fmt->iface); 415 if (err < 0) 416 continue; 417 418 usb_audio_info(chip, 419 "found and selected valid clock source %d\n", 420 ret); 421 return ret; 422 } 423 424 return -ENXIO; 425 } 426 427 /* FIXME: multipliers only act as pass-thru element for now */ 428 multiplier = snd_usb_find_clock_multiplier(chip, entity_id, fmt); 429 if (multiplier) 430 return __uac_clock_find_source(chip, fmt, 431 GET_VAL(multiplier, proto, bCSourceID), 432 visited, validate); 433 434 return -EINVAL; 435 } 436 437 /* 438 * For all kinds of sample rate settings and other device queries, 439 * the clock source (end-leaf) must be used. However, clock selectors, 440 * clock multipliers and sample rate converters may be specified as 441 * clock source input to terminal. This functions walks the clock path 442 * to its end and tries to find the source. 443 * 444 * The 'visited' bitfield is used internally to detect recursive loops. 445 * 446 * Returns the clock source UnitID (>=0) on success, or an error. 447 */ 448 int snd_usb_clock_find_source(struct snd_usb_audio *chip, 449 const struct audioformat *fmt, bool validate) 450 { 451 DECLARE_BITMAP(visited, 256); 452 memset(visited, 0, sizeof(visited)); 453 454 switch (fmt->protocol) { 455 case UAC_VERSION_2: 456 case UAC_VERSION_3: 457 return __uac_clock_find_source(chip, fmt, fmt->clock, visited, 458 validate); 459 default: 460 return -EINVAL; 461 } 462 } 463 464 static int set_sample_rate_v1(struct snd_usb_audio *chip, 465 const struct audioformat *fmt, int rate) 466 { 467 struct usb_device *dev = chip->dev; 468 unsigned char data[3]; 469 int err, crate; 470 471 /* if endpoint doesn't have sampling rate control, bail out */ 472 if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) 473 return 0; 474 475 data[0] = rate; 476 data[1] = rate >> 8; 477 data[2] = rate >> 16; 478 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 479 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 480 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, 481 fmt->endpoint, data, sizeof(data)); 482 if (err < 0) { 483 dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n", 484 fmt->iface, fmt->altsetting, rate, fmt->endpoint); 485 return err; 486 } 487 488 /* Don't check the sample rate for devices which we know don't 489 * support reading */ 490 if (chip->quirk_flags & QUIRK_FLAG_GET_SAMPLE_RATE) 491 return 0; 492 /* the firmware is likely buggy, don't repeat to fail too many times */ 493 if (chip->sample_rate_read_error > 2) 494 return 0; 495 496 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR, 497 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN, 498 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, 499 fmt->endpoint, data, sizeof(data)); 500 if (err < 0) { 501 dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n", 502 fmt->iface, fmt->altsetting, fmt->endpoint); 503 chip->sample_rate_read_error++; 504 return 0; /* some devices don't support reading */ 505 } 506 507 crate = data[0] | (data[1] << 8) | (data[2] << 16); 508 if (!crate) { 509 dev_info(&dev->dev, "failed to read current rate; disabling the check\n"); 510 chip->sample_rate_read_error = 3; /* three strikes, see above */ 511 return 0; 512 } 513 514 if (crate != rate) { 515 dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate); 516 // runtime->rate = crate; 517 } 518 519 return 0; 520 } 521 522 static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface, 523 int altsetting, int clock) 524 { 525 struct usb_device *dev = chip->dev; 526 __le32 data; 527 int err; 528 struct usb_host_interface *ctrl_intf; 529 530 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface); 531 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 532 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 533 UAC2_CS_CONTROL_SAM_FREQ << 8, 534 snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), 535 &data, sizeof(data)); 536 if (err < 0) { 537 dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n", 538 iface, altsetting, err); 539 return 0; 540 } 541 542 return le32_to_cpu(data); 543 } 544 545 /* 546 * Try to set the given sample rate: 547 * 548 * Return 0 if the clock source is read-only, the actual rate on success, 549 * or a negative error code. 550 * 551 * This function gets called from format.c to validate each sample rate, too. 552 * Hence no message is shown upon error 553 */ 554 int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip, 555 const struct audioformat *fmt, 556 int clock, int rate) 557 { 558 bool writeable; 559 u32 bmControls; 560 __le32 data; 561 int err; 562 union uac23_clock_source_desc *cs_desc; 563 struct usb_host_interface *ctrl_intf; 564 565 ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); 566 cs_desc = snd_usb_find_clock_source(chip, clock, fmt); 567 568 if (!cs_desc) 569 return 0; 570 571 if (fmt->protocol == UAC_VERSION_3) 572 bmControls = le32_to_cpu(cs_desc->v3.bmControls); 573 else 574 bmControls = cs_desc->v2.bmControls; 575 576 writeable = uac_v2v3_control_is_writeable(bmControls, 577 UAC2_CS_CONTROL_SAM_FREQ); 578 if (!writeable) 579 return 0; 580 581 data = cpu_to_le32(rate); 582 err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR, 583 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 584 UAC2_CS_CONTROL_SAM_FREQ << 8, 585 snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), 586 &data, sizeof(data)); 587 if (err < 0) 588 return err; 589 590 return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); 591 } 592 593 static int set_sample_rate_v2v3(struct snd_usb_audio *chip, 594 const struct audioformat *fmt, int rate) 595 { 596 int cur_rate, prev_rate; 597 int clock; 598 599 /* First, try to find a valid clock. This may trigger 600 * automatic clock selection if the current clock is not 601 * valid. 602 */ 603 clock = snd_usb_clock_find_source(chip, fmt, true); 604 if (clock < 0) { 605 /* We did not find a valid clock, but that might be 606 * because the current sample rate does not match an 607 * external clock source. Try again without validation 608 * and we will do another validation after setting the 609 * rate. 610 */ 611 clock = snd_usb_clock_find_source(chip, fmt, false); 612 613 /* Hardcoded sample rates */ 614 if (chip->quirk_flags & QUIRK_FLAG_IGNORE_CLOCK_SOURCE) 615 return 0; 616 617 if (clock < 0) 618 return clock; 619 } 620 621 prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); 622 if (prev_rate == rate) 623 goto validation; 624 625 cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate); 626 if (cur_rate < 0) { 627 usb_audio_err(chip, 628 "%d:%d: cannot set freq %d (v2/v3): err %d\n", 629 fmt->iface, fmt->altsetting, rate, cur_rate); 630 return cur_rate; 631 } 632 633 if (!cur_rate) 634 cur_rate = prev_rate; 635 636 if (cur_rate != rate) { 637 usb_audio_dbg(chip, 638 "%d:%d: freq mismatch: req %d, clock runs @%d\n", 639 fmt->iface, fmt->altsetting, rate, cur_rate); 640 /* continue processing */ 641 } 642 643 /* FIXME - TEAC devices require the immediate interface setup */ 644 if (USB_ID_VENDOR(chip->usb_id) == 0x0644) { 645 bool cur_base_48k = (rate % 48000 == 0); 646 bool prev_base_48k = (prev_rate % 48000 == 0); 647 if (cur_base_48k != prev_base_48k) { 648 usb_set_interface(chip->dev, fmt->iface, fmt->altsetting); 649 if (chip->quirk_flags & QUIRK_FLAG_IFACE_DELAY) 650 msleep(50); 651 } 652 } 653 654 validation: 655 /* validate clock after rate change */ 656 if (!uac_clock_source_is_valid(chip, fmt, clock)) 657 return -ENXIO; 658 return 0; 659 } 660 661 int snd_usb_init_sample_rate(struct snd_usb_audio *chip, 662 const struct audioformat *fmt, int rate) 663 { 664 usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n", 665 fmt->iface, fmt->altsetting, rate, fmt->clock); 666 667 switch (fmt->protocol) { 668 case UAC_VERSION_1: 669 default: 670 return set_sample_rate_v1(chip, fmt, rate); 671 672 case UAC_VERSION_3: 673 if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) { 674 if (rate != UAC3_BADD_SAMPLING_RATE) 675 return -ENXIO; 676 else 677 return 0; 678 } 679 fallthrough; 680 case UAC_VERSION_2: 681 return set_sample_rate_v2v3(chip, fmt, rate); 682 } 683 } 684 685