1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * u_audio.c -- interface to USB gadget "ALSA sound card" utilities 4 * 5 * Copyright (C) 2016 6 * Author: Ruslan Bilovol <ruslan.bilovol@gmail.com> 7 * 8 * Sound card implementation was cut-and-pasted with changes 9 * from f_uac2.c and has: 10 * Copyright (C) 2011 11 * Yadwinder Singh (yadi.brar01@gmail.com) 12 * Jaswinder Singh (jaswinder.singh@linaro.org) 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/pcm_params.h> 20 #include <sound/control.h> 21 #include <sound/tlv.h> 22 #include <linux/usb/audio.h> 23 24 #include "u_audio.h" 25 26 #define BUFF_SIZE_MAX (PAGE_SIZE * 16) 27 #define PRD_SIZE_MAX PAGE_SIZE 28 #define MIN_PERIODS 4 29 30 enum { 31 UAC_FBACK_CTRL, 32 UAC_P_PITCH_CTRL, 33 UAC_MUTE_CTRL, 34 UAC_VOLUME_CTRL, 35 UAC_RATE_CTRL, 36 }; 37 38 /* Runtime data params for one stream */ 39 struct uac_rtd_params { 40 struct snd_uac_chip *uac; /* parent chip */ 41 bool ep_enabled; /* if the ep is enabled */ 42 43 struct snd_pcm_substream *ss; 44 45 /* Ring buffer */ 46 ssize_t hw_ptr; 47 48 void *rbuf; 49 50 unsigned int pitch; /* Stream pitch ratio to 1000000 */ 51 unsigned int max_psize; /* MaxPacketSize of endpoint */ 52 53 struct usb_request **reqs; 54 55 struct usb_request *req_fback; /* Feedback endpoint request */ 56 bool fb_ep_enabled; /* if the ep is enabled */ 57 58 /* Volume/Mute controls and their state */ 59 int fu_id; /* Feature Unit ID */ 60 struct snd_ctl_elem_id snd_kctl_volume_id; 61 struct snd_ctl_elem_id snd_kctl_mute_id; 62 s16 volume_min, volume_max, volume_res; 63 s16 volume; 64 int mute; 65 66 struct snd_ctl_elem_id snd_kctl_rate_id; /* read-only current rate */ 67 int srate; /* selected samplerate */ 68 int active; /* playback/capture running */ 69 70 spinlock_t lock; /* lock for control transfers */ 71 72 }; 73 74 struct snd_uac_chip { 75 struct g_audio *audio_dev; 76 77 struct uac_rtd_params p_prm; 78 struct uac_rtd_params c_prm; 79 80 struct snd_card *card; 81 struct snd_pcm *pcm; 82 83 /* pre-calculated values for playback iso completion */ 84 unsigned long long p_residue_mil; 85 unsigned int p_interval; 86 unsigned int p_framesize; 87 }; 88 89 static const struct snd_pcm_hardware uac_pcm_hardware = { 90 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER 91 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID 92 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 93 .rates = SNDRV_PCM_RATE_CONTINUOUS, 94 .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX, 95 .buffer_bytes_max = BUFF_SIZE_MAX, 96 .period_bytes_max = PRD_SIZE_MAX, 97 .periods_min = MIN_PERIODS, 98 }; 99 100 static void u_audio_set_fback_frequency(enum usb_device_speed speed, 101 struct usb_ep *out_ep, 102 unsigned long long freq, 103 unsigned int pitch, 104 void *buf) 105 { 106 u32 ff = 0; 107 const struct usb_endpoint_descriptor *ep_desc; 108 109 /* 110 * Because the pitch base is 1000000, the final divider here 111 * will be 1000 * 1000000 = 1953125 << 9 112 * 113 * Instead of dealing with big numbers lets fold this 9 left shift 114 */ 115 116 if (speed == USB_SPEED_FULL) { 117 /* 118 * Full-speed feedback endpoints report frequency 119 * in samples/frame 120 * Format is encoded in Q10.10 left-justified in the 24 bits, 121 * so that it has a Q10.14 format. 122 * 123 * ff = (freq << 14) / 1000 124 */ 125 freq <<= 5; 126 } else { 127 /* 128 * High-speed feedback endpoints report frequency 129 * in samples/microframe. 130 * Format is encoded in Q12.13 fitted into four bytes so that 131 * the binary point is located between the second and the third 132 * byte fromat (that is Q16.16) 133 * 134 * ff = (freq << 16) / 8000 135 * 136 * Win10 and OSX UAC2 drivers require number of samples per packet 137 * in order to honor the feedback value. 138 * Linux snd-usb-audio detects the applied bit-shift automatically. 139 */ 140 ep_desc = out_ep->desc; 141 freq <<= 4 + (ep_desc->bInterval - 1); 142 } 143 144 ff = DIV_ROUND_CLOSEST_ULL((freq * pitch), 1953125); 145 146 *(__le32 *)buf = cpu_to_le32(ff); 147 } 148 149 static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) 150 { 151 unsigned int pending; 152 unsigned int hw_ptr; 153 int status = req->status; 154 struct snd_pcm_substream *substream; 155 struct snd_pcm_runtime *runtime; 156 struct uac_rtd_params *prm = req->context; 157 struct snd_uac_chip *uac = prm->uac; 158 unsigned int frames, p_pktsize; 159 unsigned long long pitched_rate_mil, p_pktsize_residue_mil, 160 residue_frames_mil, div_result; 161 162 /* i/f shutting down */ 163 if (!prm->ep_enabled) { 164 usb_ep_free_request(ep, req); 165 return; 166 } 167 168 if (req->status == -ESHUTDOWN) 169 return; 170 171 /* 172 * We can't really do much about bad xfers. 173 * Afterall, the ISOCH xfers could fail legitimately. 174 */ 175 if (status) 176 pr_debug("%s: iso_complete status(%d) %d/%d\n", 177 __func__, status, req->actual, req->length); 178 179 substream = prm->ss; 180 181 /* Do nothing if ALSA isn't active */ 182 if (!substream) 183 goto exit; 184 185 snd_pcm_stream_lock(substream); 186 187 runtime = substream->runtime; 188 if (!runtime || !snd_pcm_running(substream)) { 189 snd_pcm_stream_unlock(substream); 190 goto exit; 191 } 192 193 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 194 /* 195 * For each IN packet, take the quotient of the current data 196 * rate and the endpoint's interval as the base packet size. 197 * If there is a residue from this division, add it to the 198 * residue accumulator. 199 */ 200 unsigned long long p_interval_mil = uac->p_interval * 1000000ULL; 201 202 pitched_rate_mil = (unsigned long long) prm->srate * prm->pitch; 203 div_result = pitched_rate_mil; 204 do_div(div_result, uac->p_interval); 205 do_div(div_result, 1000000); 206 frames = (unsigned int) div_result; 207 208 pr_debug("p_srate %d, pitch %d, interval_mil %llu, frames %d\n", 209 prm->srate, prm->pitch, p_interval_mil, frames); 210 211 p_pktsize = min_t(unsigned int, 212 uac->p_framesize * frames, 213 ep->maxpacket); 214 215 if (p_pktsize < ep->maxpacket) { 216 residue_frames_mil = pitched_rate_mil - frames * p_interval_mil; 217 p_pktsize_residue_mil = uac->p_framesize * residue_frames_mil; 218 } else 219 p_pktsize_residue_mil = 0; 220 221 req->length = p_pktsize; 222 uac->p_residue_mil += p_pktsize_residue_mil; 223 224 /* 225 * Whenever there are more bytes in the accumulator p_residue_mil than we 226 * need to add one more sample frame, increase this packet's 227 * size and decrease the accumulator. 228 */ 229 div_result = uac->p_residue_mil; 230 do_div(div_result, uac->p_interval); 231 do_div(div_result, 1000000); 232 if ((unsigned int) div_result >= uac->p_framesize) { 233 req->length += uac->p_framesize; 234 uac->p_residue_mil -= uac->p_framesize * p_interval_mil; 235 pr_debug("increased req length to %d\n", req->length); 236 } 237 pr_debug("remains uac->p_residue_mil %llu\n", uac->p_residue_mil); 238 239 req->actual = req->length; 240 } 241 242 hw_ptr = prm->hw_ptr; 243 244 /* Pack USB load in ALSA ring buffer */ 245 pending = runtime->dma_bytes - hw_ptr; 246 247 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 248 if (unlikely(pending < req->actual)) { 249 memcpy(req->buf, runtime->dma_area + hw_ptr, pending); 250 memcpy(req->buf + pending, runtime->dma_area, 251 req->actual - pending); 252 } else { 253 memcpy(req->buf, runtime->dma_area + hw_ptr, 254 req->actual); 255 } 256 } else { 257 if (unlikely(pending < req->actual)) { 258 memcpy(runtime->dma_area + hw_ptr, req->buf, pending); 259 memcpy(runtime->dma_area, req->buf + pending, 260 req->actual - pending); 261 } else { 262 memcpy(runtime->dma_area + hw_ptr, req->buf, 263 req->actual); 264 } 265 } 266 267 /* update hw_ptr after data is copied to memory */ 268 prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes; 269 hw_ptr = prm->hw_ptr; 270 snd_pcm_stream_unlock(substream); 271 272 if ((hw_ptr % snd_pcm_lib_period_bytes(substream)) < req->actual) 273 snd_pcm_period_elapsed(substream); 274 275 exit: 276 if (usb_ep_queue(ep, req, GFP_ATOMIC)) 277 dev_err(uac->card->dev, "%d Error!\n", __LINE__); 278 } 279 280 static void u_audio_iso_fback_complete(struct usb_ep *ep, 281 struct usb_request *req) 282 { 283 struct uac_rtd_params *prm = req->context; 284 struct snd_uac_chip *uac = prm->uac; 285 struct g_audio *audio_dev = uac->audio_dev; 286 int status = req->status; 287 288 /* i/f shutting down */ 289 if (!prm->fb_ep_enabled) { 290 kfree(req->buf); 291 usb_ep_free_request(ep, req); 292 return; 293 } 294 295 if (req->status == -ESHUTDOWN) 296 return; 297 298 /* 299 * We can't really do much about bad xfers. 300 * Afterall, the ISOCH xfers could fail legitimately. 301 */ 302 if (status) 303 pr_debug("%s: iso_complete status(%d) %d/%d\n", 304 __func__, status, req->actual, req->length); 305 306 u_audio_set_fback_frequency(audio_dev->gadget->speed, audio_dev->out_ep, 307 prm->srate, prm->pitch, 308 req->buf); 309 310 if (usb_ep_queue(ep, req, GFP_ATOMIC)) 311 dev_err(uac->card->dev, "%d Error!\n", __LINE__); 312 } 313 314 static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 315 { 316 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 317 struct uac_rtd_params *prm; 318 struct g_audio *audio_dev; 319 struct uac_params *params; 320 int err = 0; 321 322 audio_dev = uac->audio_dev; 323 params = &audio_dev->params; 324 325 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 326 prm = &uac->p_prm; 327 else 328 prm = &uac->c_prm; 329 330 /* Reset */ 331 prm->hw_ptr = 0; 332 333 switch (cmd) { 334 case SNDRV_PCM_TRIGGER_START: 335 case SNDRV_PCM_TRIGGER_RESUME: 336 prm->ss = substream; 337 break; 338 case SNDRV_PCM_TRIGGER_STOP: 339 case SNDRV_PCM_TRIGGER_SUSPEND: 340 prm->ss = NULL; 341 break; 342 default: 343 err = -EINVAL; 344 } 345 346 /* Clear buffer after Play stops */ 347 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss) 348 memset(prm->rbuf, 0, prm->max_psize * params->req_number); 349 350 return err; 351 } 352 353 static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream) 354 { 355 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 356 struct uac_rtd_params *prm; 357 358 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 359 prm = &uac->p_prm; 360 else 361 prm = &uac->c_prm; 362 363 return bytes_to_frames(substream->runtime, prm->hw_ptr); 364 } 365 366 static u64 uac_ssize_to_fmt(int ssize) 367 { 368 u64 ret; 369 370 switch (ssize) { 371 case 3: 372 ret = SNDRV_PCM_FMTBIT_S24_3LE; 373 break; 374 case 4: 375 ret = SNDRV_PCM_FMTBIT_S32_LE; 376 break; 377 default: 378 ret = SNDRV_PCM_FMTBIT_S16_LE; 379 break; 380 } 381 382 return ret; 383 } 384 385 static int uac_pcm_open(struct snd_pcm_substream *substream) 386 { 387 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); 388 struct snd_pcm_runtime *runtime = substream->runtime; 389 struct g_audio *audio_dev; 390 struct uac_params *params; 391 struct uac_rtd_params *prm; 392 int p_ssize, c_ssize; 393 int p_chmask, c_chmask; 394 395 audio_dev = uac->audio_dev; 396 params = &audio_dev->params; 397 p_ssize = params->p_ssize; 398 c_ssize = params->c_ssize; 399 p_chmask = params->p_chmask; 400 c_chmask = params->c_chmask; 401 uac->p_residue_mil = 0; 402 403 runtime->hw = uac_pcm_hardware; 404 405 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 406 runtime->hw.formats = uac_ssize_to_fmt(p_ssize); 407 runtime->hw.channels_min = num_channels(p_chmask); 408 prm = &uac->p_prm; 409 } else { 410 runtime->hw.formats = uac_ssize_to_fmt(c_ssize); 411 runtime->hw.channels_min = num_channels(c_chmask); 412 prm = &uac->c_prm; 413 } 414 415 runtime->hw.period_bytes_min = 2 * prm->max_psize 416 / runtime->hw.periods_min; 417 runtime->hw.rate_min = prm->srate; 418 runtime->hw.rate_max = runtime->hw.rate_min; 419 runtime->hw.channels_max = runtime->hw.channels_min; 420 421 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 422 423 return 0; 424 } 425 426 /* ALSA cries without these function pointers */ 427 static int uac_pcm_null(struct snd_pcm_substream *substream) 428 { 429 return 0; 430 } 431 432 static const struct snd_pcm_ops uac_pcm_ops = { 433 .open = uac_pcm_open, 434 .close = uac_pcm_null, 435 .trigger = uac_pcm_trigger, 436 .pointer = uac_pcm_pointer, 437 .prepare = uac_pcm_null, 438 }; 439 440 static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep) 441 { 442 struct snd_uac_chip *uac = prm->uac; 443 struct g_audio *audio_dev; 444 struct uac_params *params; 445 int i; 446 447 if (!prm->ep_enabled) 448 return; 449 450 audio_dev = uac->audio_dev; 451 params = &audio_dev->params; 452 453 for (i = 0; i < params->req_number; i++) { 454 if (prm->reqs[i]) { 455 if (usb_ep_dequeue(ep, prm->reqs[i])) 456 usb_ep_free_request(ep, prm->reqs[i]); 457 /* 458 * If usb_ep_dequeue() cannot successfully dequeue the 459 * request, the request will be freed by the completion 460 * callback. 461 */ 462 463 prm->reqs[i] = NULL; 464 } 465 } 466 467 prm->ep_enabled = false; 468 469 if (usb_ep_disable(ep)) 470 dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__); 471 } 472 473 static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep) 474 { 475 struct snd_uac_chip *uac = prm->uac; 476 477 if (!prm->fb_ep_enabled) 478 return; 479 480 if (prm->req_fback) { 481 if (usb_ep_dequeue(ep, prm->req_fback)) { 482 kfree(prm->req_fback->buf); 483 usb_ep_free_request(ep, prm->req_fback); 484 } 485 prm->req_fback = NULL; 486 } 487 488 prm->fb_ep_enabled = false; 489 490 if (usb_ep_disable(ep)) 491 dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__); 492 } 493 494 static void set_active(struct uac_rtd_params *prm, bool active) 495 { 496 // notifying through the Rate ctrl 497 unsigned long flags; 498 499 spin_lock_irqsave(&prm->lock, flags); 500 if (prm->active != active) { 501 prm->active = active; 502 snd_ctl_notify(prm->uac->card, SNDRV_CTL_EVENT_MASK_VALUE, 503 &prm->snd_kctl_rate_id); 504 } 505 spin_unlock_irqrestore(&prm->lock, flags); 506 } 507 508 int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate) 509 { 510 struct uac_params *params = &audio_dev->params; 511 struct snd_uac_chip *uac = audio_dev->uac; 512 struct uac_rtd_params *prm; 513 int i; 514 unsigned long flags; 515 516 dev_dbg(&audio_dev->gadget->dev, "%s: srate %d\n", __func__, srate); 517 prm = &uac->c_prm; 518 for (i = 0; i < UAC_MAX_RATES; i++) { 519 if (params->c_srates[i] == srate) { 520 spin_lock_irqsave(&prm->lock, flags); 521 prm->srate = srate; 522 spin_unlock_irqrestore(&prm->lock, flags); 523 return 0; 524 } 525 if (params->c_srates[i] == 0) 526 break; 527 } 528 529 return -EINVAL; 530 } 531 EXPORT_SYMBOL_GPL(u_audio_set_capture_srate); 532 533 int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val) 534 { 535 struct snd_uac_chip *uac = audio_dev->uac; 536 struct uac_rtd_params *prm; 537 unsigned long flags; 538 539 prm = &uac->c_prm; 540 spin_lock_irqsave(&prm->lock, flags); 541 *val = prm->srate; 542 spin_unlock_irqrestore(&prm->lock, flags); 543 return 0; 544 } 545 EXPORT_SYMBOL_GPL(u_audio_get_capture_srate); 546 547 int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate) 548 { 549 struct uac_params *params = &audio_dev->params; 550 struct snd_uac_chip *uac = audio_dev->uac; 551 struct uac_rtd_params *prm; 552 int i; 553 unsigned long flags; 554 555 dev_dbg(&audio_dev->gadget->dev, "%s: srate %d\n", __func__, srate); 556 prm = &uac->p_prm; 557 for (i = 0; i < UAC_MAX_RATES; i++) { 558 if (params->p_srates[i] == srate) { 559 spin_lock_irqsave(&prm->lock, flags); 560 prm->srate = srate; 561 spin_unlock_irqrestore(&prm->lock, flags); 562 return 0; 563 } 564 if (params->p_srates[i] == 0) 565 break; 566 } 567 568 return -EINVAL; 569 } 570 EXPORT_SYMBOL_GPL(u_audio_set_playback_srate); 571 572 int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val) 573 { 574 struct snd_uac_chip *uac = audio_dev->uac; 575 struct uac_rtd_params *prm; 576 unsigned long flags; 577 578 prm = &uac->p_prm; 579 spin_lock_irqsave(&prm->lock, flags); 580 *val = prm->srate; 581 spin_unlock_irqrestore(&prm->lock, flags); 582 return 0; 583 } 584 EXPORT_SYMBOL_GPL(u_audio_get_playback_srate); 585 586 int u_audio_start_capture(struct g_audio *audio_dev) 587 { 588 struct snd_uac_chip *uac = audio_dev->uac; 589 struct usb_gadget *gadget = audio_dev->gadget; 590 struct device *dev = &gadget->dev; 591 struct usb_request *req, *req_fback; 592 struct usb_ep *ep, *ep_fback; 593 struct uac_rtd_params *prm; 594 struct uac_params *params = &audio_dev->params; 595 int req_len, i, ret; 596 597 prm = &uac->c_prm; 598 dev_dbg(dev, "start capture with rate %d\n", prm->srate); 599 ep = audio_dev->out_ep; 600 ret = config_ep_by_speed(gadget, &audio_dev->func, ep); 601 if (ret < 0) { 602 dev_err(dev, "config_ep_by_speed for out_ep failed (%d)\n", ret); 603 return ret; 604 } 605 606 req_len = ep->maxpacket; 607 608 prm->ep_enabled = true; 609 ret = usb_ep_enable(ep); 610 if (ret < 0) { 611 dev_err(dev, "usb_ep_enable failed for out_ep (%d)\n", ret); 612 return ret; 613 } 614 615 for (i = 0; i < params->req_number; i++) { 616 if (!prm->reqs[i]) { 617 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 618 if (req == NULL) 619 return -ENOMEM; 620 621 prm->reqs[i] = req; 622 623 req->zero = 0; 624 req->context = prm; 625 req->length = req_len; 626 req->complete = u_audio_iso_complete; 627 req->buf = prm->rbuf + i * ep->maxpacket; 628 } 629 630 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC)) 631 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 632 } 633 634 set_active(&uac->c_prm, true); 635 636 ep_fback = audio_dev->in_ep_fback; 637 if (!ep_fback) 638 return 0; 639 640 /* Setup feedback endpoint */ 641 ret = config_ep_by_speed(gadget, &audio_dev->func, ep_fback); 642 if (ret < 0) { 643 dev_err(dev, "config_ep_by_speed in_ep_fback failed (%d)\n", ret); 644 return ret; // TODO: Clean up out_ep 645 } 646 647 prm->fb_ep_enabled = true; 648 ret = usb_ep_enable(ep_fback); 649 if (ret < 0) { 650 dev_err(dev, "usb_ep_enable failed for in_ep_fback (%d)\n", ret); 651 return ret; // TODO: Clean up out_ep 652 } 653 req_len = ep_fback->maxpacket; 654 655 req_fback = usb_ep_alloc_request(ep_fback, GFP_ATOMIC); 656 if (req_fback == NULL) 657 return -ENOMEM; 658 659 prm->req_fback = req_fback; 660 req_fback->zero = 0; 661 req_fback->context = prm; 662 req_fback->length = req_len; 663 req_fback->complete = u_audio_iso_fback_complete; 664 665 req_fback->buf = kzalloc(req_len, GFP_ATOMIC); 666 if (!req_fback->buf) 667 return -ENOMEM; 668 669 /* 670 * Configure the feedback endpoint's reported frequency. 671 * Always start with original frequency since its deviation can't 672 * be meauserd at start of playback 673 */ 674 prm->pitch = 1000000; 675 u_audio_set_fback_frequency(audio_dev->gadget->speed, ep, 676 prm->srate, prm->pitch, 677 req_fback->buf); 678 679 if (usb_ep_queue(ep_fback, req_fback, GFP_ATOMIC)) 680 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 681 682 return 0; 683 } 684 EXPORT_SYMBOL_GPL(u_audio_start_capture); 685 686 void u_audio_stop_capture(struct g_audio *audio_dev) 687 { 688 struct snd_uac_chip *uac = audio_dev->uac; 689 690 set_active(&uac->c_prm, false); 691 if (audio_dev->in_ep_fback) 692 free_ep_fback(&uac->c_prm, audio_dev->in_ep_fback); 693 free_ep(&uac->c_prm, audio_dev->out_ep); 694 } 695 EXPORT_SYMBOL_GPL(u_audio_stop_capture); 696 697 int u_audio_start_playback(struct g_audio *audio_dev) 698 { 699 struct snd_uac_chip *uac = audio_dev->uac; 700 struct usb_gadget *gadget = audio_dev->gadget; 701 struct device *dev = &gadget->dev; 702 struct usb_request *req; 703 struct usb_ep *ep; 704 struct uac_rtd_params *prm; 705 struct uac_params *params = &audio_dev->params; 706 unsigned int factor; 707 const struct usb_endpoint_descriptor *ep_desc; 708 int req_len, i, ret; 709 unsigned int p_pktsize; 710 711 prm = &uac->p_prm; 712 dev_dbg(dev, "start playback with rate %d\n", prm->srate); 713 ep = audio_dev->in_ep; 714 ret = config_ep_by_speed(gadget, &audio_dev->func, ep); 715 if (ret < 0) { 716 dev_err(dev, "config_ep_by_speed for in_ep failed (%d)\n", ret); 717 return ret; 718 } 719 720 ep_desc = ep->desc; 721 /* 722 * Always start with original frequency 723 */ 724 prm->pitch = 1000000; 725 726 /* pre-calculate the playback endpoint's interval */ 727 if (gadget->speed == USB_SPEED_FULL) 728 factor = 1000; 729 else 730 factor = 8000; 731 732 /* pre-compute some values for iso_complete() */ 733 uac->p_framesize = params->p_ssize * 734 num_channels(params->p_chmask); 735 uac->p_interval = factor / (1 << (ep_desc->bInterval - 1)); 736 p_pktsize = min_t(unsigned int, 737 uac->p_framesize * 738 (prm->srate / uac->p_interval), 739 ep->maxpacket); 740 741 req_len = p_pktsize; 742 uac->p_residue_mil = 0; 743 744 prm->ep_enabled = true; 745 ret = usb_ep_enable(ep); 746 if (ret < 0) { 747 dev_err(dev, "usb_ep_enable failed for in_ep (%d)\n", ret); 748 return ret; 749 } 750 751 for (i = 0; i < params->req_number; i++) { 752 if (!prm->reqs[i]) { 753 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 754 if (req == NULL) 755 return -ENOMEM; 756 757 prm->reqs[i] = req; 758 759 req->zero = 0; 760 req->context = prm; 761 req->length = req_len; 762 req->complete = u_audio_iso_complete; 763 req->buf = prm->rbuf + i * ep->maxpacket; 764 } 765 766 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC)) 767 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 768 } 769 770 set_active(&uac->p_prm, true); 771 772 return 0; 773 } 774 EXPORT_SYMBOL_GPL(u_audio_start_playback); 775 776 void u_audio_stop_playback(struct g_audio *audio_dev) 777 { 778 struct snd_uac_chip *uac = audio_dev->uac; 779 780 set_active(&uac->p_prm, false); 781 free_ep(&uac->p_prm, audio_dev->in_ep); 782 } 783 EXPORT_SYMBOL_GPL(u_audio_stop_playback); 784 785 void u_audio_suspend(struct g_audio *audio_dev) 786 { 787 struct snd_uac_chip *uac = audio_dev->uac; 788 789 set_active(&uac->p_prm, false); 790 set_active(&uac->c_prm, false); 791 } 792 EXPORT_SYMBOL_GPL(u_audio_suspend); 793 794 int u_audio_get_volume(struct g_audio *audio_dev, int playback, s16 *val) 795 { 796 struct snd_uac_chip *uac = audio_dev->uac; 797 struct uac_rtd_params *prm; 798 unsigned long flags; 799 800 if (playback) 801 prm = &uac->p_prm; 802 else 803 prm = &uac->c_prm; 804 805 spin_lock_irqsave(&prm->lock, flags); 806 *val = prm->volume; 807 spin_unlock_irqrestore(&prm->lock, flags); 808 809 return 0; 810 } 811 EXPORT_SYMBOL_GPL(u_audio_get_volume); 812 813 int u_audio_set_volume(struct g_audio *audio_dev, int playback, s16 val) 814 { 815 struct snd_uac_chip *uac = audio_dev->uac; 816 struct uac_rtd_params *prm; 817 unsigned long flags; 818 int change = 0; 819 820 if (playback) 821 prm = &uac->p_prm; 822 else 823 prm = &uac->c_prm; 824 825 spin_lock_irqsave(&prm->lock, flags); 826 val = clamp(val, prm->volume_min, prm->volume_max); 827 if (prm->volume != val) { 828 prm->volume = val; 829 change = 1; 830 } 831 spin_unlock_irqrestore(&prm->lock, flags); 832 833 if (change) 834 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE, 835 &prm->snd_kctl_volume_id); 836 837 return 0; 838 } 839 EXPORT_SYMBOL_GPL(u_audio_set_volume); 840 841 int u_audio_get_mute(struct g_audio *audio_dev, int playback, int *val) 842 { 843 struct snd_uac_chip *uac = audio_dev->uac; 844 struct uac_rtd_params *prm; 845 unsigned long flags; 846 847 if (playback) 848 prm = &uac->p_prm; 849 else 850 prm = &uac->c_prm; 851 852 spin_lock_irqsave(&prm->lock, flags); 853 *val = prm->mute; 854 spin_unlock_irqrestore(&prm->lock, flags); 855 856 return 0; 857 } 858 EXPORT_SYMBOL_GPL(u_audio_get_mute); 859 860 int u_audio_set_mute(struct g_audio *audio_dev, int playback, int val) 861 { 862 struct snd_uac_chip *uac = audio_dev->uac; 863 struct uac_rtd_params *prm; 864 unsigned long flags; 865 int change = 0; 866 int mute; 867 868 if (playback) 869 prm = &uac->p_prm; 870 else 871 prm = &uac->c_prm; 872 873 mute = val ? 1 : 0; 874 875 spin_lock_irqsave(&prm->lock, flags); 876 if (prm->mute != mute) { 877 prm->mute = mute; 878 change = 1; 879 } 880 spin_unlock_irqrestore(&prm->lock, flags); 881 882 if (change) 883 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE, 884 &prm->snd_kctl_mute_id); 885 886 return 0; 887 } 888 EXPORT_SYMBOL_GPL(u_audio_set_mute); 889 890 891 static int u_audio_pitch_info(struct snd_kcontrol *kcontrol, 892 struct snd_ctl_elem_info *uinfo) 893 { 894 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 895 struct snd_uac_chip *uac = prm->uac; 896 struct g_audio *audio_dev = uac->audio_dev; 897 struct uac_params *params = &audio_dev->params; 898 unsigned int pitch_min, pitch_max; 899 900 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000; 901 pitch_max = (1000 + params->fb_max) * 1000; 902 903 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 904 uinfo->count = 1; 905 uinfo->value.integer.min = pitch_min; 906 uinfo->value.integer.max = pitch_max; 907 uinfo->value.integer.step = 1; 908 return 0; 909 } 910 911 static int u_audio_pitch_get(struct snd_kcontrol *kcontrol, 912 struct snd_ctl_elem_value *ucontrol) 913 { 914 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 915 916 ucontrol->value.integer.value[0] = prm->pitch; 917 918 return 0; 919 } 920 921 static int u_audio_pitch_put(struct snd_kcontrol *kcontrol, 922 struct snd_ctl_elem_value *ucontrol) 923 { 924 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 925 struct snd_uac_chip *uac = prm->uac; 926 struct g_audio *audio_dev = uac->audio_dev; 927 struct uac_params *params = &audio_dev->params; 928 unsigned int val; 929 unsigned int pitch_min, pitch_max; 930 int change = 0; 931 932 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000; 933 pitch_max = (1000 + params->fb_max) * 1000; 934 935 val = ucontrol->value.integer.value[0]; 936 937 if (val < pitch_min) 938 val = pitch_min; 939 if (val > pitch_max) 940 val = pitch_max; 941 942 if (prm->pitch != val) { 943 prm->pitch = val; 944 change = 1; 945 } 946 947 return change; 948 } 949 950 static int u_audio_mute_info(struct snd_kcontrol *kcontrol, 951 struct snd_ctl_elem_info *uinfo) 952 { 953 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 954 uinfo->count = 1; 955 uinfo->value.integer.min = 0; 956 uinfo->value.integer.max = 1; 957 uinfo->value.integer.step = 1; 958 959 return 0; 960 } 961 962 static int u_audio_mute_get(struct snd_kcontrol *kcontrol, 963 struct snd_ctl_elem_value *ucontrol) 964 { 965 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 966 unsigned long flags; 967 968 spin_lock_irqsave(&prm->lock, flags); 969 ucontrol->value.integer.value[0] = !prm->mute; 970 spin_unlock_irqrestore(&prm->lock, flags); 971 972 return 0; 973 } 974 975 static int u_audio_mute_put(struct snd_kcontrol *kcontrol, 976 struct snd_ctl_elem_value *ucontrol) 977 { 978 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 979 struct snd_uac_chip *uac = prm->uac; 980 struct g_audio *audio_dev = uac->audio_dev; 981 unsigned int val; 982 unsigned long flags; 983 int change = 0; 984 985 val = !ucontrol->value.integer.value[0]; 986 987 spin_lock_irqsave(&prm->lock, flags); 988 if (val != prm->mute) { 989 prm->mute = val; 990 change = 1; 991 } 992 spin_unlock_irqrestore(&prm->lock, flags); 993 994 if (change && audio_dev->notify) 995 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_MUTE); 996 997 return change; 998 } 999 1000 /* 1001 * TLV callback for mixer volume controls 1002 */ 1003 static int u_audio_volume_tlv(struct snd_kcontrol *kcontrol, int op_flag, 1004 unsigned int size, unsigned int __user *_tlv) 1005 { 1006 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 1007 DECLARE_TLV_DB_MINMAX(scale, 0, 0); 1008 1009 if (size < sizeof(scale)) 1010 return -ENOMEM; 1011 1012 /* UAC volume resolution is 1/256 dB, TLV is 1/100 dB */ 1013 scale[2] = (prm->volume_min * 100) / 256; 1014 scale[3] = (prm->volume_max * 100) / 256; 1015 if (copy_to_user(_tlv, scale, sizeof(scale))) 1016 return -EFAULT; 1017 1018 return 0; 1019 } 1020 1021 static int u_audio_volume_info(struct snd_kcontrol *kcontrol, 1022 struct snd_ctl_elem_info *uinfo) 1023 { 1024 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 1025 1026 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 1027 uinfo->count = 1; 1028 uinfo->value.integer.min = 0; 1029 uinfo->value.integer.max = 1030 (prm->volume_max - prm->volume_min + prm->volume_res - 1) 1031 / prm->volume_res; 1032 uinfo->value.integer.step = 1; 1033 1034 return 0; 1035 } 1036 1037 static int u_audio_volume_get(struct snd_kcontrol *kcontrol, 1038 struct snd_ctl_elem_value *ucontrol) 1039 { 1040 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 1041 unsigned long flags; 1042 1043 spin_lock_irqsave(&prm->lock, flags); 1044 ucontrol->value.integer.value[0] = 1045 (prm->volume - prm->volume_min) / prm->volume_res; 1046 spin_unlock_irqrestore(&prm->lock, flags); 1047 1048 return 0; 1049 } 1050 1051 static int u_audio_volume_put(struct snd_kcontrol *kcontrol, 1052 struct snd_ctl_elem_value *ucontrol) 1053 { 1054 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 1055 struct snd_uac_chip *uac = prm->uac; 1056 struct g_audio *audio_dev = uac->audio_dev; 1057 unsigned int val; 1058 s16 volume; 1059 unsigned long flags; 1060 int change = 0; 1061 1062 val = ucontrol->value.integer.value[0]; 1063 1064 spin_lock_irqsave(&prm->lock, flags); 1065 volume = (val * prm->volume_res) + prm->volume_min; 1066 volume = clamp(volume, prm->volume_min, prm->volume_max); 1067 if (volume != prm->volume) { 1068 prm->volume = volume; 1069 change = 1; 1070 } 1071 spin_unlock_irqrestore(&prm->lock, flags); 1072 1073 if (change && audio_dev->notify) 1074 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_VOLUME); 1075 1076 return change; 1077 } 1078 1079 static int get_max_srate(const int *srates) 1080 { 1081 int i, max_srate = 0; 1082 1083 for (i = 0; i < UAC_MAX_RATES; i++) { 1084 if (srates[i] == 0) 1085 break; 1086 if (srates[i] > max_srate) 1087 max_srate = srates[i]; 1088 } 1089 return max_srate; 1090 } 1091 1092 static int get_min_srate(const int *srates) 1093 { 1094 int i, min_srate = INT_MAX; 1095 1096 for (i = 0; i < UAC_MAX_RATES; i++) { 1097 if (srates[i] == 0) 1098 break; 1099 if (srates[i] < min_srate) 1100 min_srate = srates[i]; 1101 } 1102 return min_srate; 1103 } 1104 1105 static int u_audio_rate_info(struct snd_kcontrol *kcontrol, 1106 struct snd_ctl_elem_info *uinfo) 1107 { 1108 const int *srates; 1109 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 1110 struct snd_uac_chip *uac = prm->uac; 1111 struct g_audio *audio_dev = uac->audio_dev; 1112 struct uac_params *params = &audio_dev->params; 1113 1114 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 1115 uinfo->count = 1; 1116 1117 if (prm == &uac->c_prm) 1118 srates = params->c_srates; 1119 else 1120 srates = params->p_srates; 1121 uinfo->value.integer.min = get_min_srate(srates); 1122 uinfo->value.integer.max = get_max_srate(srates); 1123 return 0; 1124 } 1125 1126 static int u_audio_rate_get(struct snd_kcontrol *kcontrol, 1127 struct snd_ctl_elem_value *ucontrol) 1128 { 1129 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol); 1130 unsigned long flags; 1131 1132 spin_lock_irqsave(&prm->lock, flags); 1133 if (prm->active) 1134 ucontrol->value.integer.value[0] = prm->srate; 1135 else 1136 /* not active: reporting zero rate */ 1137 ucontrol->value.integer.value[0] = 0; 1138 spin_unlock_irqrestore(&prm->lock, flags); 1139 return 0; 1140 } 1141 1142 static struct snd_kcontrol_new u_audio_controls[] = { 1143 [UAC_FBACK_CTRL] { 1144 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 1145 .name = "Capture Pitch 1000000", 1146 .info = u_audio_pitch_info, 1147 .get = u_audio_pitch_get, 1148 .put = u_audio_pitch_put, 1149 }, 1150 [UAC_P_PITCH_CTRL] { 1151 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 1152 .name = "Playback Pitch 1000000", 1153 .info = u_audio_pitch_info, 1154 .get = u_audio_pitch_get, 1155 .put = u_audio_pitch_put, 1156 }, 1157 [UAC_MUTE_CTRL] { 1158 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 1159 .name = "", /* will be filled later */ 1160 .info = u_audio_mute_info, 1161 .get = u_audio_mute_get, 1162 .put = u_audio_mute_put, 1163 }, 1164 [UAC_VOLUME_CTRL] { 1165 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 1166 .name = "", /* will be filled later */ 1167 .info = u_audio_volume_info, 1168 .get = u_audio_volume_get, 1169 .put = u_audio_volume_put, 1170 }, 1171 [UAC_RATE_CTRL] { 1172 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 1173 .name = "", /* will be filled later */ 1174 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 1175 .info = u_audio_rate_info, 1176 .get = u_audio_rate_get, 1177 }, 1178 }; 1179 1180 int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, 1181 const char *card_name) 1182 { 1183 struct snd_uac_chip *uac; 1184 struct snd_card *card; 1185 struct snd_pcm *pcm; 1186 struct snd_kcontrol *kctl; 1187 struct uac_params *params; 1188 int p_chmask, c_chmask; 1189 int i, err; 1190 1191 if (!g_audio) 1192 return -EINVAL; 1193 1194 uac = kzalloc(sizeof(*uac), GFP_KERNEL); 1195 if (!uac) 1196 return -ENOMEM; 1197 g_audio->uac = uac; 1198 uac->audio_dev = g_audio; 1199 1200 params = &g_audio->params; 1201 p_chmask = params->p_chmask; 1202 c_chmask = params->c_chmask; 1203 1204 if (c_chmask) { 1205 struct uac_rtd_params *prm = &uac->c_prm; 1206 1207 spin_lock_init(&prm->lock); 1208 uac->c_prm.uac = uac; 1209 prm->max_psize = g_audio->out_ep_maxpsize; 1210 prm->srate = params->c_srates[0]; 1211 1212 prm->reqs = kcalloc(params->req_number, 1213 sizeof(struct usb_request *), 1214 GFP_KERNEL); 1215 if (!prm->reqs) { 1216 err = -ENOMEM; 1217 goto fail; 1218 } 1219 1220 prm->rbuf = kcalloc(params->req_number, prm->max_psize, 1221 GFP_KERNEL); 1222 if (!prm->rbuf) { 1223 prm->max_psize = 0; 1224 err = -ENOMEM; 1225 goto fail; 1226 } 1227 } 1228 1229 if (p_chmask) { 1230 struct uac_rtd_params *prm = &uac->p_prm; 1231 1232 spin_lock_init(&prm->lock); 1233 uac->p_prm.uac = uac; 1234 prm->max_psize = g_audio->in_ep_maxpsize; 1235 prm->srate = params->p_srates[0]; 1236 1237 prm->reqs = kcalloc(params->req_number, 1238 sizeof(struct usb_request *), 1239 GFP_KERNEL); 1240 if (!prm->reqs) { 1241 err = -ENOMEM; 1242 goto fail; 1243 } 1244 1245 prm->rbuf = kcalloc(params->req_number, prm->max_psize, 1246 GFP_KERNEL); 1247 if (!prm->rbuf) { 1248 prm->max_psize = 0; 1249 err = -ENOMEM; 1250 goto fail; 1251 } 1252 } 1253 1254 /* Choose any slot, with no id */ 1255 err = snd_card_new(&g_audio->gadget->dev, 1256 -1, NULL, THIS_MODULE, 0, &card); 1257 if (err < 0) 1258 goto fail; 1259 1260 uac->card = card; 1261 1262 /* 1263 * Create first PCM device 1264 * Create a substream only for non-zero channel streams 1265 */ 1266 err = snd_pcm_new(uac->card, pcm_name, 0, 1267 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm); 1268 if (err < 0) 1269 goto snd_fail; 1270 1271 strscpy(pcm->name, pcm_name); 1272 pcm->private_data = uac; 1273 uac->pcm = pcm; 1274 1275 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops); 1276 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops); 1277 1278 /* 1279 * Create mixer and controls 1280 * Create only if it's required on USB side 1281 */ 1282 if ((c_chmask && g_audio->in_ep_fback) 1283 || (p_chmask && params->p_fu.id) 1284 || (c_chmask && params->c_fu.id)) 1285 strscpy(card->mixername, card_name); 1286 1287 if (c_chmask && g_audio->in_ep_fback) { 1288 kctl = snd_ctl_new1(&u_audio_controls[UAC_FBACK_CTRL], 1289 &uac->c_prm); 1290 if (!kctl) { 1291 err = -ENOMEM; 1292 goto snd_fail; 1293 } 1294 1295 kctl->id.device = pcm->device; 1296 kctl->id.subdevice = 0; 1297 1298 err = snd_ctl_add(card, kctl); 1299 if (err < 0) 1300 goto snd_fail; 1301 } 1302 1303 if (p_chmask) { 1304 kctl = snd_ctl_new1(&u_audio_controls[UAC_P_PITCH_CTRL], 1305 &uac->p_prm); 1306 if (!kctl) { 1307 err = -ENOMEM; 1308 goto snd_fail; 1309 } 1310 1311 kctl->id.device = pcm->device; 1312 kctl->id.subdevice = 0; 1313 1314 err = snd_ctl_add(card, kctl); 1315 if (err < 0) 1316 goto snd_fail; 1317 } 1318 1319 for (i = 0; i <= SNDRV_PCM_STREAM_LAST; i++) { 1320 struct uac_rtd_params *prm; 1321 struct uac_fu_params *fu; 1322 char ctrl_name[24]; 1323 char *direction; 1324 1325 if (!pcm->streams[i].substream_count) 1326 continue; 1327 1328 if (i == SNDRV_PCM_STREAM_PLAYBACK) { 1329 prm = &uac->p_prm; 1330 fu = ¶ms->p_fu; 1331 direction = "Playback"; 1332 } else { 1333 prm = &uac->c_prm; 1334 fu = ¶ms->c_fu; 1335 direction = "Capture"; 1336 } 1337 1338 prm->fu_id = fu->id; 1339 1340 if (fu->mute_present) { 1341 snprintf(ctrl_name, sizeof(ctrl_name), 1342 "PCM %s Switch", direction); 1343 1344 u_audio_controls[UAC_MUTE_CTRL].name = ctrl_name; 1345 1346 kctl = snd_ctl_new1(&u_audio_controls[UAC_MUTE_CTRL], 1347 prm); 1348 if (!kctl) { 1349 err = -ENOMEM; 1350 goto snd_fail; 1351 } 1352 1353 kctl->id.device = pcm->device; 1354 kctl->id.subdevice = 0; 1355 1356 err = snd_ctl_add(card, kctl); 1357 if (err < 0) 1358 goto snd_fail; 1359 prm->snd_kctl_mute_id = kctl->id; 1360 prm->mute = 0; 1361 } 1362 1363 if (fu->volume_present) { 1364 snprintf(ctrl_name, sizeof(ctrl_name), 1365 "PCM %s Volume", direction); 1366 1367 u_audio_controls[UAC_VOLUME_CTRL].name = ctrl_name; 1368 1369 kctl = snd_ctl_new1(&u_audio_controls[UAC_VOLUME_CTRL], 1370 prm); 1371 if (!kctl) { 1372 err = -ENOMEM; 1373 goto snd_fail; 1374 } 1375 1376 kctl->id.device = pcm->device; 1377 kctl->id.subdevice = 0; 1378 1379 1380 kctl->tlv.c = u_audio_volume_tlv; 1381 kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ | 1382 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; 1383 1384 err = snd_ctl_add(card, kctl); 1385 if (err < 0) 1386 goto snd_fail; 1387 prm->snd_kctl_volume_id = kctl->id; 1388 prm->volume = fu->volume_max; 1389 prm->volume_max = fu->volume_max; 1390 prm->volume_min = fu->volume_min; 1391 prm->volume_res = fu->volume_res; 1392 } 1393 1394 /* Add rate control */ 1395 snprintf(ctrl_name, sizeof(ctrl_name), 1396 "%s Rate", direction); 1397 u_audio_controls[UAC_RATE_CTRL].name = ctrl_name; 1398 1399 kctl = snd_ctl_new1(&u_audio_controls[UAC_RATE_CTRL], prm); 1400 if (!kctl) { 1401 err = -ENOMEM; 1402 goto snd_fail; 1403 } 1404 1405 kctl->id.device = pcm->device; 1406 kctl->id.subdevice = 0; 1407 1408 err = snd_ctl_add(card, kctl); 1409 if (err < 0) 1410 goto snd_fail; 1411 prm->snd_kctl_rate_id = kctl->id; 1412 } 1413 1414 strscpy(card->driver, card_name); 1415 strscpy(card->shortname, card_name); 1416 snprintf(card->longname, sizeof(card->longname), "%s %i", 1417 card_name, card->dev->id); 1418 1419 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, 1420 NULL, 0, BUFF_SIZE_MAX); 1421 1422 err = snd_card_register(card); 1423 1424 if (!err) 1425 return 0; 1426 1427 snd_fail: 1428 snd_card_free(card); 1429 fail: 1430 kfree(uac->p_prm.reqs); 1431 kfree(uac->c_prm.reqs); 1432 kfree(uac->p_prm.rbuf); 1433 kfree(uac->c_prm.rbuf); 1434 kfree(uac); 1435 1436 return err; 1437 } 1438 EXPORT_SYMBOL_GPL(g_audio_setup); 1439 1440 void g_audio_cleanup(struct g_audio *g_audio) 1441 { 1442 struct snd_uac_chip *uac; 1443 struct snd_card *card; 1444 1445 if (!g_audio || !g_audio->uac) 1446 return; 1447 1448 uac = g_audio->uac; 1449 g_audio->uac = NULL; 1450 1451 card = uac->card; 1452 if (card) 1453 snd_card_free_when_closed(card); 1454 1455 kfree(uac->p_prm.reqs); 1456 kfree(uac->c_prm.reqs); 1457 kfree(uac->p_prm.rbuf); 1458 kfree(uac->c_prm.rbuf); 1459 kfree(uac); 1460 } 1461 EXPORT_SYMBOL_GPL(g_audio_cleanup); 1462 1463 MODULE_LICENSE("GPL"); 1464 MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities"); 1465 MODULE_AUTHOR("Ruslan Bilovol"); 1466