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