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 * Quirk for older MOTU AVB / hybrid interfaces 212 * 213 * These devices take more than 2 seconds to switch sample rate or 214 * clock source. During this period the clock validity request 215 * returns false, causing ALSA to fail prematurely. 216 * 217 * Affected models (all use vendor 0x07fd): 218 * - MicroBook IIc → 0x0004 219 * - 1248, 624, 8A, UltraLite AVB, 8M, 16A, ... → 0x0005 220 */ 221 if (chip->usb_id == USB_ID(0x07fd, 0x0004) || /* MicroBook IIc */ 222 chip->usb_id == USB_ID(0x07fd, 0x0005)) { /* 1248 / 624 / 8A / UltraLite AVB / ... */ 223 count = 0; 224 225 while ((!ret) && (count < 50)) { 226 int err; 227 228 msleep(100); 229 230 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 231 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 232 UAC2_CS_CONTROL_CLOCK_VALID << 8, 233 snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), 234 &data, sizeof(data)); 235 if (err < 0) { 236 dev_warn(&dev->dev, 237 "%s(): cannot get clock validity for id %d\n", 238 __func__, source_id); 239 return false; 240 } 241 242 ret = !!data; 243 count++; 244 } 245 } 246 247 return ret; 248 } 249 250 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, 251 const struct audioformat *fmt, 252 int source_id) 253 { 254 int err; 255 unsigned char data; 256 struct usb_device *dev = chip->dev; 257 u32 bmControls; 258 union uac23_clock_source_desc *cs_desc; 259 struct usb_host_interface *ctrl_intf; 260 261 ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); 262 cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); 263 if (!cs_desc) 264 return false; 265 266 if (fmt->protocol == UAC_VERSION_3) 267 bmControls = le32_to_cpu(cs_desc->v3.bmControls); 268 else 269 bmControls = cs_desc->v2.bmControls; 270 271 /* If a clock source can't tell us whether it's valid, we assume it is */ 272 if (!uac_v2v3_control_is_readable(bmControls, 273 UAC2_CS_CONTROL_CLOCK_VALID)) 274 return true; 275 276 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 277 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 278 UAC2_CS_CONTROL_CLOCK_VALID << 8, 279 snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), 280 &data, sizeof(data)); 281 282 if (err < 0) { 283 dev_warn(&dev->dev, 284 "%s(): cannot get clock validity for id %d\n", 285 __func__, source_id); 286 return false; 287 } 288 289 if (data) 290 return true; 291 else 292 return uac_clock_source_is_valid_quirk(chip, fmt, source_id); 293 } 294 295 static int __uac_clock_find_source(struct snd_usb_audio *chip, 296 const struct audioformat *fmt, int entity_id, 297 unsigned long *visited, bool validate) 298 { 299 union uac23_clock_source_desc *source; 300 union uac23_clock_selector_desc *selector; 301 union uac23_clock_multiplier_desc *multiplier; 302 int ret, i, cur, err, pins, clock_id; 303 const u8 *sources; 304 int proto = fmt->protocol; 305 bool readable, writeable; 306 u32 bmControls; 307 308 entity_id &= 0xff; 309 310 if (test_and_set_bit(entity_id, visited)) { 311 usb_audio_warn(chip, 312 "%s(): recursive clock topology detected, id %d.\n", 313 __func__, entity_id); 314 return -EINVAL; 315 } 316 317 /* first, see if the ID we're looking at is a clock source already */ 318 source = snd_usb_find_clock_source(chip, entity_id, fmt); 319 if (source) { 320 entity_id = GET_VAL(source, proto, bClockID); 321 if (validate && !uac_clock_source_is_valid(chip, fmt, 322 entity_id)) { 323 usb_audio_err(chip, 324 "clock source %d is not valid, cannot use\n", 325 entity_id); 326 return -ENXIO; 327 } 328 return entity_id; 329 } 330 331 selector = snd_usb_find_clock_selector(chip, entity_id, fmt); 332 if (selector) { 333 pins = GET_VAL(selector, proto, bNrInPins); 334 clock_id = GET_VAL(selector, proto, bClockID); 335 sources = GET_VAL(selector, proto, baCSourceID); 336 cur = 0; 337 338 if (proto == UAC_VERSION_3) 339 bmControls = le32_to_cpu(*(__le32 *)(&selector->v3.baCSourceID[0] + pins)); 340 else 341 bmControls = *(__u8 *)(&selector->v2.baCSourceID[0] + pins); 342 343 readable = uac_v2v3_control_is_readable(bmControls, 344 UAC2_CX_CLOCK_SELECTOR); 345 writeable = uac_v2v3_control_is_writeable(bmControls, 346 UAC2_CX_CLOCK_SELECTOR); 347 348 if (pins == 1) { 349 ret = 1; 350 goto find_source; 351 } 352 353 /* for now just warn about buggy device */ 354 if (!readable) 355 usb_audio_warn(chip, 356 "%s(): clock selector control is not readable, id %d\n", 357 __func__, clock_id); 358 359 /* the entity ID we are looking at is a selector. 360 * find out what it currently selects */ 361 ret = uac_clock_selector_get_val(chip, clock_id, fmt->iface); 362 if (ret < 0) { 363 if (!chip->autoclock) 364 return ret; 365 goto find_others; 366 } 367 368 /* Selector values are one-based */ 369 370 if (ret > pins || ret < 1) { 371 usb_audio_err(chip, 372 "%s(): selector reported illegal value, id %d, ret %d\n", 373 __func__, clock_id, ret); 374 375 if (!chip->autoclock) 376 return -EINVAL; 377 goto find_others; 378 } 379 380 find_source: 381 cur = ret; 382 ret = __uac_clock_find_source(chip, fmt, 383 sources[ret - 1], 384 visited, validate); 385 if (ret > 0) { 386 /* Skip setting clock selector again for some devices */ 387 if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR || 388 !writeable) 389 return ret; 390 err = uac_clock_selector_set_val(chip, entity_id, cur, fmt->iface); 391 if (err < 0) { 392 if (pins == 1) { 393 usb_audio_dbg(chip, 394 "%s(): selector returned an error, " 395 "assuming a firmware bug, id %d, ret %d\n", 396 __func__, clock_id, err); 397 return ret; 398 } 399 return err; 400 } 401 } 402 403 if (!validate || ret > 0 || !chip->autoclock) 404 return ret; 405 406 find_others: 407 if (!writeable) 408 return -ENXIO; 409 410 /* The current clock source is invalid, try others. */ 411 for (i = 1; i <= pins; i++) { 412 if (i == cur) 413 continue; 414 415 ret = __uac_clock_find_source(chip, fmt, 416 sources[i - 1], 417 visited, true); 418 if (ret < 0) 419 continue; 420 421 err = uac_clock_selector_set_val(chip, entity_id, i, fmt->iface); 422 if (err < 0) 423 continue; 424 425 usb_audio_info(chip, 426 "found and selected valid clock source %d\n", 427 ret); 428 return ret; 429 } 430 431 return -ENXIO; 432 } 433 434 /* FIXME: multipliers only act as pass-thru element for now */ 435 multiplier = snd_usb_find_clock_multiplier(chip, entity_id, fmt); 436 if (multiplier) 437 return __uac_clock_find_source(chip, fmt, 438 GET_VAL(multiplier, proto, bCSourceID), 439 visited, validate); 440 441 return -EINVAL; 442 } 443 444 /* 445 * For all kinds of sample rate settings and other device queries, 446 * the clock source (end-leaf) must be used. However, clock selectors, 447 * clock multipliers and sample rate converters may be specified as 448 * clock source input to terminal. This functions walks the clock path 449 * to its end and tries to find the source. 450 * 451 * The 'visited' bitfield is used internally to detect recursive loops. 452 * 453 * Returns the clock source UnitID (>=0) on success, or an error. 454 */ 455 int snd_usb_clock_find_source(struct snd_usb_audio *chip, 456 const struct audioformat *fmt, bool validate) 457 { 458 DECLARE_BITMAP(visited, 256); 459 memset(visited, 0, sizeof(visited)); 460 461 switch (fmt->protocol) { 462 case UAC_VERSION_2: 463 case UAC_VERSION_3: 464 return __uac_clock_find_source(chip, fmt, fmt->clock, visited, 465 validate); 466 default: 467 return -EINVAL; 468 } 469 } 470 471 static int set_sample_rate_v1(struct snd_usb_audio *chip, 472 const struct audioformat *fmt, int rate) 473 { 474 struct usb_device *dev = chip->dev; 475 unsigned char data[3]; 476 int err, crate; 477 478 /* if endpoint doesn't have sampling rate control, bail out */ 479 if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) 480 return 0; 481 482 data[0] = rate; 483 data[1] = rate >> 8; 484 data[2] = rate >> 16; 485 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 486 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 487 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, 488 fmt->endpoint, data, sizeof(data)); 489 if (err < 0) { 490 dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n", 491 fmt->iface, fmt->altsetting, rate, fmt->endpoint); 492 return err; 493 } 494 495 /* Don't check the sample rate for devices which we know don't 496 * support reading */ 497 if (chip->quirk_flags & QUIRK_FLAG_GET_SAMPLE_RATE) 498 return 0; 499 /* the firmware is likely buggy, don't repeat to fail too many times */ 500 if (chip->sample_rate_read_error > 2) 501 return 0; 502 503 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR, 504 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN, 505 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, 506 fmt->endpoint, data, sizeof(data)); 507 if (err < 0) { 508 dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n", 509 fmt->iface, fmt->altsetting, fmt->endpoint); 510 chip->sample_rate_read_error++; 511 return 0; /* some devices don't support reading */ 512 } 513 514 crate = data[0] | (data[1] << 8) | (data[2] << 16); 515 if (!crate) { 516 dev_info(&dev->dev, "failed to read current rate; disabling the check\n"); 517 chip->sample_rate_read_error = 3; /* three strikes, see above */ 518 return 0; 519 } 520 521 if (crate != rate) { 522 dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate); 523 // runtime->rate = crate; 524 } 525 526 return 0; 527 } 528 529 static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface, 530 int altsetting, int clock) 531 { 532 struct usb_device *dev = chip->dev; 533 __le32 data; 534 int err; 535 struct usb_host_interface *ctrl_intf; 536 537 ctrl_intf = snd_usb_find_ctrl_interface(chip, iface); 538 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, 539 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, 540 UAC2_CS_CONTROL_SAM_FREQ << 8, 541 snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), 542 &data, sizeof(data)); 543 if (err < 0) { 544 dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n", 545 iface, altsetting, err); 546 return 0; 547 } 548 549 return le32_to_cpu(data); 550 } 551 552 /* 553 * Try to set the given sample rate: 554 * 555 * Return 0 if the clock source is read-only, the actual rate on success, 556 * or a negative error code. 557 * 558 * This function gets called from format.c to validate each sample rate, too. 559 * Hence no message is shown upon error 560 */ 561 int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip, 562 const struct audioformat *fmt, 563 int clock, int rate) 564 { 565 bool writeable; 566 u32 bmControls; 567 __le32 data; 568 int err; 569 union uac23_clock_source_desc *cs_desc; 570 struct usb_host_interface *ctrl_intf; 571 572 ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); 573 cs_desc = snd_usb_find_clock_source(chip, clock, fmt); 574 575 if (!cs_desc) 576 return 0; 577 578 if (fmt->protocol == UAC_VERSION_3) 579 bmControls = le32_to_cpu(cs_desc->v3.bmControls); 580 else 581 bmControls = cs_desc->v2.bmControls; 582 583 writeable = uac_v2v3_control_is_writeable(bmControls, 584 UAC2_CS_CONTROL_SAM_FREQ); 585 if (!writeable) 586 return 0; 587 588 data = cpu_to_le32(rate); 589 err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR, 590 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 591 UAC2_CS_CONTROL_SAM_FREQ << 8, 592 snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), 593 &data, sizeof(data)); 594 if (err < 0) 595 return err; 596 597 return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); 598 } 599 600 static int set_sample_rate_v2v3(struct snd_usb_audio *chip, 601 const struct audioformat *fmt, int rate) 602 { 603 int cur_rate, prev_rate; 604 int clock; 605 606 /* First, try to find a valid clock. This may trigger 607 * automatic clock selection if the current clock is not 608 * valid. 609 */ 610 clock = snd_usb_clock_find_source(chip, fmt, true); 611 if (clock < 0) { 612 /* We did not find a valid clock, but that might be 613 * because the current sample rate does not match an 614 * external clock source. Try again without validation 615 * and we will do another validation after setting the 616 * rate. 617 */ 618 clock = snd_usb_clock_find_source(chip, fmt, false); 619 620 /* Hardcoded sample rates */ 621 if (chip->quirk_flags & QUIRK_FLAG_IGNORE_CLOCK_SOURCE) 622 return 0; 623 624 if (clock < 0) 625 return clock; 626 } 627 628 prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); 629 if (prev_rate == rate) 630 goto validation; 631 632 cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate); 633 if (cur_rate < 0) { 634 usb_audio_err(chip, 635 "%d:%d: cannot set freq %d (v2/v3): err %d\n", 636 fmt->iface, fmt->altsetting, rate, cur_rate); 637 return cur_rate; 638 } 639 640 if (!cur_rate) 641 cur_rate = prev_rate; 642 643 if (cur_rate != rate) { 644 usb_audio_dbg(chip, 645 "%d:%d: freq mismatch: req %d, clock runs @%d\n", 646 fmt->iface, fmt->altsetting, rate, cur_rate); 647 /* continue processing */ 648 } 649 650 /* FIXME - TEAC devices require the immediate interface setup */ 651 if (USB_ID_VENDOR(chip->usb_id) == 0x0644) { 652 bool cur_base_48k = (rate % 48000 == 0); 653 bool prev_base_48k = (prev_rate % 48000 == 0); 654 if (cur_base_48k != prev_base_48k) { 655 usb_set_interface(chip->dev, fmt->iface, fmt->altsetting); 656 if (chip->quirk_flags & QUIRK_FLAG_IFACE_DELAY) 657 msleep(50); 658 } 659 } 660 661 validation: 662 /* validate clock after rate change */ 663 if (!uac_clock_source_is_valid(chip, fmt, clock)) 664 return -ENXIO; 665 return 0; 666 } 667 668 int snd_usb_init_sample_rate(struct snd_usb_audio *chip, 669 const struct audioformat *fmt, int rate) 670 { 671 usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n", 672 fmt->iface, fmt->altsetting, rate, fmt->clock); 673 674 switch (fmt->protocol) { 675 case UAC_VERSION_1: 676 default: 677 return set_sample_rate_v1(chip, fmt, rate); 678 679 case UAC_VERSION_3: 680 if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) { 681 if (rate != UAC3_BADD_SAMPLING_RATE) 682 return -ENXIO; 683 else 684 return 0; 685 } 686 fallthrough; 687 case UAC_VERSION_2: 688 return set_sample_rate_v2v3(chip, fmt, rate); 689 } 690 } 691 692