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