1 /* 2 * f_uac2.c -- USB Audio Class 2.0 Function 3 * 4 * Copyright (C) 2011 5 * Yadwinder Singh (yadi.brar01@gmail.com) 6 * Jaswinder Singh (jaswinder.singh@linaro.org) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/usb/audio.h> 15 #include <linux/usb/audio-v2.h> 16 #include <linux/platform_device.h> 17 #include <linux/module.h> 18 19 #include <sound/core.h> 20 #include <sound/pcm.h> 21 #include <sound/pcm_params.h> 22 23 #include "u_uac2.h" 24 25 /* Keep everyone on toes */ 26 #define USB_XFERS 2 27 28 /* 29 * The driver implements a simple UAC_2 topology. 30 * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture 31 * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN 32 * Capture and Playback sampling rates are independently 33 * controlled by two clock sources : 34 * CLK_5 := c_srate, and CLK_6 := p_srate 35 */ 36 #define USB_OUT_IT_ID 1 37 #define IO_IN_IT_ID 2 38 #define IO_OUT_OT_ID 3 39 #define USB_IN_OT_ID 4 40 #define USB_OUT_CLK_ID 5 41 #define USB_IN_CLK_ID 6 42 43 #define CONTROL_ABSENT 0 44 #define CONTROL_RDONLY 1 45 #define CONTROL_RDWR 3 46 47 #define CLK_FREQ_CTRL 0 48 #define CLK_VLD_CTRL 2 49 50 #define COPY_CTRL 0 51 #define CONN_CTRL 2 52 #define OVRLD_CTRL 4 53 #define CLSTR_CTRL 6 54 #define UNFLW_CTRL 8 55 #define OVFLW_CTRL 10 56 57 static const char *uac2_name = "snd_uac2"; 58 59 struct uac2_req { 60 struct uac2_rtd_params *pp; /* parent param */ 61 struct usb_request *req; 62 }; 63 64 struct uac2_rtd_params { 65 struct snd_uac2_chip *uac2; /* parent chip */ 66 bool ep_enabled; /* if the ep is enabled */ 67 /* Size of the ring buffer */ 68 size_t dma_bytes; 69 unsigned char *dma_area; 70 71 struct snd_pcm_substream *ss; 72 73 /* Ring buffer */ 74 ssize_t hw_ptr; 75 76 void *rbuf; 77 78 size_t period_size; 79 80 unsigned max_psize; 81 struct uac2_req ureq[USB_XFERS]; 82 83 spinlock_t lock; 84 }; 85 86 struct snd_uac2_chip { 87 struct platform_device pdev; 88 struct platform_driver pdrv; 89 90 struct uac2_rtd_params p_prm; 91 struct uac2_rtd_params c_prm; 92 93 struct snd_card *card; 94 struct snd_pcm *pcm; 95 96 /* timekeeping for the playback endpoint */ 97 unsigned int p_interval; 98 unsigned int p_residue; 99 100 /* pre-calculated values for playback iso completion */ 101 unsigned int p_pktsize; 102 unsigned int p_pktsize_residue; 103 unsigned int p_framesize; 104 }; 105 106 #define BUFF_SIZE_MAX (PAGE_SIZE * 16) 107 #define PRD_SIZE_MAX PAGE_SIZE 108 #define MIN_PERIODS 4 109 110 static struct snd_pcm_hardware uac2_pcm_hardware = { 111 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER 112 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID 113 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 114 .rates = SNDRV_PCM_RATE_CONTINUOUS, 115 .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX, 116 .buffer_bytes_max = BUFF_SIZE_MAX, 117 .period_bytes_max = PRD_SIZE_MAX, 118 .periods_min = MIN_PERIODS, 119 }; 120 121 struct audio_dev { 122 u8 ac_intf, ac_alt; 123 u8 as_out_intf, as_out_alt; 124 u8 as_in_intf, as_in_alt; 125 126 struct usb_ep *in_ep, *out_ep; 127 struct usb_function func; 128 129 /* The ALSA Sound Card it represents on the USB-Client side */ 130 struct snd_uac2_chip uac2; 131 }; 132 133 static inline 134 struct audio_dev *func_to_agdev(struct usb_function *f) 135 { 136 return container_of(f, struct audio_dev, func); 137 } 138 139 static inline 140 struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u) 141 { 142 return container_of(u, struct audio_dev, uac2); 143 } 144 145 static inline 146 struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p) 147 { 148 return container_of(p, struct snd_uac2_chip, pdev); 149 } 150 151 static inline 152 struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev) 153 { 154 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst); 155 } 156 157 static inline 158 uint num_channels(uint chanmask) 159 { 160 uint num = 0; 161 162 while (chanmask) { 163 num += (chanmask & 1); 164 chanmask >>= 1; 165 } 166 167 return num; 168 } 169 170 static void 171 agdev_iso_complete(struct usb_ep *ep, struct usb_request *req) 172 { 173 unsigned pending; 174 unsigned long flags; 175 unsigned int hw_ptr; 176 bool update_alsa = false; 177 int status = req->status; 178 struct uac2_req *ur = req->context; 179 struct snd_pcm_substream *substream; 180 struct uac2_rtd_params *prm = ur->pp; 181 struct snd_uac2_chip *uac2 = prm->uac2; 182 183 /* i/f shutting down */ 184 if (!prm->ep_enabled || req->status == -ESHUTDOWN) 185 return; 186 187 /* 188 * We can't really do much about bad xfers. 189 * Afterall, the ISOCH xfers could fail legitimately. 190 */ 191 if (status) 192 pr_debug("%s: iso_complete status(%d) %d/%d\n", 193 __func__, status, req->actual, req->length); 194 195 substream = prm->ss; 196 197 /* Do nothing if ALSA isn't active */ 198 if (!substream) 199 goto exit; 200 201 spin_lock_irqsave(&prm->lock, flags); 202 203 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 204 /* 205 * For each IN packet, take the quotient of the current data 206 * rate and the endpoint's interval as the base packet size. 207 * If there is a residue from this division, add it to the 208 * residue accumulator. 209 */ 210 req->length = uac2->p_pktsize; 211 uac2->p_residue += uac2->p_pktsize_residue; 212 213 /* 214 * Whenever there are more bytes in the accumulator than we 215 * need to add one more sample frame, increase this packet's 216 * size and decrease the accumulator. 217 */ 218 if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) { 219 req->length += uac2->p_framesize; 220 uac2->p_residue -= uac2->p_framesize * 221 uac2->p_interval; 222 } 223 224 req->actual = req->length; 225 } 226 227 pending = prm->hw_ptr % prm->period_size; 228 pending += req->actual; 229 if (pending >= prm->period_size) 230 update_alsa = true; 231 232 hw_ptr = prm->hw_ptr; 233 prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes; 234 235 spin_unlock_irqrestore(&prm->lock, flags); 236 237 /* Pack USB load in ALSA ring buffer */ 238 pending = prm->dma_bytes - hw_ptr; 239 240 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 241 if (unlikely(pending < req->actual)) { 242 memcpy(req->buf, prm->dma_area + hw_ptr, pending); 243 memcpy(req->buf + pending, prm->dma_area, 244 req->actual - pending); 245 } else { 246 memcpy(req->buf, prm->dma_area + hw_ptr, req->actual); 247 } 248 } else { 249 if (unlikely(pending < req->actual)) { 250 memcpy(prm->dma_area + hw_ptr, req->buf, pending); 251 memcpy(prm->dma_area, req->buf + pending, 252 req->actual - pending); 253 } else { 254 memcpy(prm->dma_area + hw_ptr, req->buf, req->actual); 255 } 256 } 257 258 exit: 259 if (usb_ep_queue(ep, req, GFP_ATOMIC)) 260 dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__); 261 262 if (update_alsa) 263 snd_pcm_period_elapsed(substream); 264 265 return; 266 } 267 268 static int 269 uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 270 { 271 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 272 struct uac2_rtd_params *prm; 273 unsigned long flags; 274 int err = 0; 275 276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 277 prm = &uac2->p_prm; 278 else 279 prm = &uac2->c_prm; 280 281 spin_lock_irqsave(&prm->lock, flags); 282 283 /* Reset */ 284 prm->hw_ptr = 0; 285 286 switch (cmd) { 287 case SNDRV_PCM_TRIGGER_START: 288 case SNDRV_PCM_TRIGGER_RESUME: 289 prm->ss = substream; 290 break; 291 case SNDRV_PCM_TRIGGER_STOP: 292 case SNDRV_PCM_TRIGGER_SUSPEND: 293 prm->ss = NULL; 294 break; 295 default: 296 err = -EINVAL; 297 } 298 299 spin_unlock_irqrestore(&prm->lock, flags); 300 301 /* Clear buffer after Play stops */ 302 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss) 303 memset(prm->rbuf, 0, prm->max_psize * USB_XFERS); 304 305 return err; 306 } 307 308 static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream) 309 { 310 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 311 struct uac2_rtd_params *prm; 312 313 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 314 prm = &uac2->p_prm; 315 else 316 prm = &uac2->c_prm; 317 318 return bytes_to_frames(substream->runtime, prm->hw_ptr); 319 } 320 321 static int uac2_pcm_hw_params(struct snd_pcm_substream *substream, 322 struct snd_pcm_hw_params *hw_params) 323 { 324 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 325 struct uac2_rtd_params *prm; 326 int err; 327 328 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 329 prm = &uac2->p_prm; 330 else 331 prm = &uac2->c_prm; 332 333 err = snd_pcm_lib_malloc_pages(substream, 334 params_buffer_bytes(hw_params)); 335 if (err >= 0) { 336 prm->dma_bytes = substream->runtime->dma_bytes; 337 prm->dma_area = substream->runtime->dma_area; 338 prm->period_size = params_period_bytes(hw_params); 339 } 340 341 return err; 342 } 343 344 static int uac2_pcm_hw_free(struct snd_pcm_substream *substream) 345 { 346 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 347 struct uac2_rtd_params *prm; 348 349 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 350 prm = &uac2->p_prm; 351 else 352 prm = &uac2->c_prm; 353 354 prm->dma_area = NULL; 355 prm->dma_bytes = 0; 356 prm->period_size = 0; 357 358 return snd_pcm_lib_free_pages(substream); 359 } 360 361 static int uac2_pcm_open(struct snd_pcm_substream *substream) 362 { 363 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 364 struct snd_pcm_runtime *runtime = substream->runtime; 365 struct audio_dev *audio_dev; 366 struct f_uac2_opts *opts; 367 int p_ssize, c_ssize; 368 int p_srate, c_srate; 369 int p_chmask, c_chmask; 370 371 audio_dev = uac2_to_agdev(uac2); 372 opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst); 373 p_ssize = opts->p_ssize; 374 c_ssize = opts->c_ssize; 375 p_srate = opts->p_srate; 376 c_srate = opts->c_srate; 377 p_chmask = opts->p_chmask; 378 c_chmask = opts->c_chmask; 379 uac2->p_residue = 0; 380 381 runtime->hw = uac2_pcm_hardware; 382 383 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 384 spin_lock_init(&uac2->p_prm.lock); 385 runtime->hw.rate_min = p_srate; 386 switch (p_ssize) { 387 case 3: 388 runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE; 389 break; 390 case 4: 391 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE; 392 break; 393 default: 394 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; 395 break; 396 } 397 runtime->hw.channels_min = num_channels(p_chmask); 398 runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize 399 / runtime->hw.periods_min; 400 } else { 401 spin_lock_init(&uac2->c_prm.lock); 402 runtime->hw.rate_min = c_srate; 403 switch (c_ssize) { 404 case 3: 405 runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE; 406 break; 407 case 4: 408 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE; 409 break; 410 default: 411 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; 412 break; 413 } 414 runtime->hw.channels_min = num_channels(c_chmask); 415 runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize 416 / runtime->hw.periods_min; 417 } 418 419 runtime->hw.rate_max = runtime->hw.rate_min; 420 runtime->hw.channels_max = runtime->hw.channels_min; 421 422 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 423 424 return 0; 425 } 426 427 /* ALSA cries without these function pointers */ 428 static int uac2_pcm_null(struct snd_pcm_substream *substream) 429 { 430 return 0; 431 } 432 433 static struct snd_pcm_ops uac2_pcm_ops = { 434 .open = uac2_pcm_open, 435 .close = uac2_pcm_null, 436 .ioctl = snd_pcm_lib_ioctl, 437 .hw_params = uac2_pcm_hw_params, 438 .hw_free = uac2_pcm_hw_free, 439 .trigger = uac2_pcm_trigger, 440 .pointer = uac2_pcm_pointer, 441 .prepare = uac2_pcm_null, 442 }; 443 444 static int snd_uac2_probe(struct platform_device *pdev) 445 { 446 struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev); 447 struct snd_card *card; 448 struct snd_pcm *pcm; 449 struct audio_dev *audio_dev; 450 struct f_uac2_opts *opts; 451 int err; 452 int p_chmask, c_chmask; 453 454 audio_dev = uac2_to_agdev(uac2); 455 opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst); 456 p_chmask = opts->p_chmask; 457 c_chmask = opts->c_chmask; 458 459 /* Choose any slot, with no id */ 460 err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card); 461 if (err < 0) 462 return err; 463 464 uac2->card = card; 465 466 /* 467 * Create first PCM device 468 * Create a substream only for non-zero channel streams 469 */ 470 err = snd_pcm_new(uac2->card, "UAC2 PCM", 0, 471 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm); 472 if (err < 0) 473 goto snd_fail; 474 475 strcpy(pcm->name, "UAC2 PCM"); 476 pcm->private_data = uac2; 477 478 uac2->pcm = pcm; 479 480 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops); 481 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops); 482 483 strcpy(card->driver, "UAC2_Gadget"); 484 strcpy(card->shortname, "UAC2_Gadget"); 485 sprintf(card->longname, "UAC2_Gadget %i", pdev->id); 486 487 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, 488 snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX); 489 490 err = snd_card_register(card); 491 if (!err) { 492 platform_set_drvdata(pdev, card); 493 return 0; 494 } 495 496 snd_fail: 497 snd_card_free(card); 498 499 uac2->pcm = NULL; 500 uac2->card = NULL; 501 502 return err; 503 } 504 505 static int snd_uac2_remove(struct platform_device *pdev) 506 { 507 struct snd_card *card = platform_get_drvdata(pdev); 508 509 if (card) 510 return snd_card_free(card); 511 512 return 0; 513 } 514 515 static void snd_uac2_release(struct device *dev) 516 { 517 dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); 518 } 519 520 static int alsa_uac2_init(struct audio_dev *agdev) 521 { 522 struct snd_uac2_chip *uac2 = &agdev->uac2; 523 int err; 524 525 uac2->pdrv.probe = snd_uac2_probe; 526 uac2->pdrv.remove = snd_uac2_remove; 527 uac2->pdrv.driver.name = uac2_name; 528 529 uac2->pdev.id = 0; 530 uac2->pdev.name = uac2_name; 531 uac2->pdev.dev.release = snd_uac2_release; 532 533 /* Register snd_uac2 driver */ 534 err = platform_driver_register(&uac2->pdrv); 535 if (err) 536 return err; 537 538 /* Register snd_uac2 device */ 539 err = platform_device_register(&uac2->pdev); 540 if (err) 541 platform_driver_unregister(&uac2->pdrv); 542 543 return err; 544 } 545 546 static void alsa_uac2_exit(struct audio_dev *agdev) 547 { 548 struct snd_uac2_chip *uac2 = &agdev->uac2; 549 550 platform_driver_unregister(&uac2->pdrv); 551 platform_device_unregister(&uac2->pdev); 552 } 553 554 555 /* --------- USB Function Interface ------------- */ 556 557 enum { 558 STR_ASSOC, 559 STR_IF_CTRL, 560 STR_CLKSRC_IN, 561 STR_CLKSRC_OUT, 562 STR_USB_IT, 563 STR_IO_IT, 564 STR_USB_OT, 565 STR_IO_OT, 566 STR_AS_OUT_ALT0, 567 STR_AS_OUT_ALT1, 568 STR_AS_IN_ALT0, 569 STR_AS_IN_ALT1, 570 }; 571 572 static char clksrc_in[8]; 573 static char clksrc_out[8]; 574 575 static struct usb_string strings_fn[] = { 576 [STR_ASSOC].s = "Source/Sink", 577 [STR_IF_CTRL].s = "Topology Control", 578 [STR_CLKSRC_IN].s = clksrc_in, 579 [STR_CLKSRC_OUT].s = clksrc_out, 580 [STR_USB_IT].s = "USBH Out", 581 [STR_IO_IT].s = "USBD Out", 582 [STR_USB_OT].s = "USBH In", 583 [STR_IO_OT].s = "USBD In", 584 [STR_AS_OUT_ALT0].s = "Playback Inactive", 585 [STR_AS_OUT_ALT1].s = "Playback Active", 586 [STR_AS_IN_ALT0].s = "Capture Inactive", 587 [STR_AS_IN_ALT1].s = "Capture Active", 588 { }, 589 }; 590 591 static struct usb_gadget_strings str_fn = { 592 .language = 0x0409, /* en-us */ 593 .strings = strings_fn, 594 }; 595 596 static struct usb_gadget_strings *fn_strings[] = { 597 &str_fn, 598 NULL, 599 }; 600 601 static struct usb_qualifier_descriptor devqual_desc = { 602 .bLength = sizeof devqual_desc, 603 .bDescriptorType = USB_DT_DEVICE_QUALIFIER, 604 605 .bcdUSB = cpu_to_le16(0x200), 606 .bDeviceClass = USB_CLASS_MISC, 607 .bDeviceSubClass = 0x02, 608 .bDeviceProtocol = 0x01, 609 .bNumConfigurations = 1, 610 .bRESERVED = 0, 611 }; 612 613 static struct usb_interface_assoc_descriptor iad_desc = { 614 .bLength = sizeof iad_desc, 615 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 616 617 .bFirstInterface = 0, 618 .bInterfaceCount = 3, 619 .bFunctionClass = USB_CLASS_AUDIO, 620 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED, 621 .bFunctionProtocol = UAC_VERSION_2, 622 }; 623 624 /* Audio Control Interface */ 625 static struct usb_interface_descriptor std_ac_if_desc = { 626 .bLength = sizeof std_ac_if_desc, 627 .bDescriptorType = USB_DT_INTERFACE, 628 629 .bAlternateSetting = 0, 630 .bNumEndpoints = 0, 631 .bInterfaceClass = USB_CLASS_AUDIO, 632 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 633 .bInterfaceProtocol = UAC_VERSION_2, 634 }; 635 636 /* Clock source for IN traffic */ 637 static struct uac_clock_source_descriptor in_clk_src_desc = { 638 .bLength = sizeof in_clk_src_desc, 639 .bDescriptorType = USB_DT_CS_INTERFACE, 640 641 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 642 .bClockID = USB_IN_CLK_ID, 643 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 644 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 645 .bAssocTerminal = 0, 646 }; 647 648 /* Clock source for OUT traffic */ 649 static struct uac_clock_source_descriptor out_clk_src_desc = { 650 .bLength = sizeof out_clk_src_desc, 651 .bDescriptorType = USB_DT_CS_INTERFACE, 652 653 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 654 .bClockID = USB_OUT_CLK_ID, 655 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 656 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 657 .bAssocTerminal = 0, 658 }; 659 660 /* Input Terminal for USB_OUT */ 661 static struct uac2_input_terminal_descriptor usb_out_it_desc = { 662 .bLength = sizeof usb_out_it_desc, 663 .bDescriptorType = USB_DT_CS_INTERFACE, 664 665 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 666 .bTerminalID = USB_OUT_IT_ID, 667 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 668 .bAssocTerminal = 0, 669 .bCSourceID = USB_OUT_CLK_ID, 670 .iChannelNames = 0, 671 .bmControls = (CONTROL_RDWR << COPY_CTRL), 672 }; 673 674 /* Input Terminal for I/O-In */ 675 static struct uac2_input_terminal_descriptor io_in_it_desc = { 676 .bLength = sizeof io_in_it_desc, 677 .bDescriptorType = USB_DT_CS_INTERFACE, 678 679 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 680 .bTerminalID = IO_IN_IT_ID, 681 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED), 682 .bAssocTerminal = 0, 683 .bCSourceID = USB_IN_CLK_ID, 684 .iChannelNames = 0, 685 .bmControls = (CONTROL_RDWR << COPY_CTRL), 686 }; 687 688 /* Ouput Terminal for USB_IN */ 689 static struct uac2_output_terminal_descriptor usb_in_ot_desc = { 690 .bLength = sizeof usb_in_ot_desc, 691 .bDescriptorType = USB_DT_CS_INTERFACE, 692 693 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 694 .bTerminalID = USB_IN_OT_ID, 695 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 696 .bAssocTerminal = 0, 697 .bSourceID = IO_IN_IT_ID, 698 .bCSourceID = USB_IN_CLK_ID, 699 .bmControls = (CONTROL_RDWR << COPY_CTRL), 700 }; 701 702 /* Ouput Terminal for I/O-Out */ 703 static struct uac2_output_terminal_descriptor io_out_ot_desc = { 704 .bLength = sizeof io_out_ot_desc, 705 .bDescriptorType = USB_DT_CS_INTERFACE, 706 707 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 708 .bTerminalID = IO_OUT_OT_ID, 709 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED), 710 .bAssocTerminal = 0, 711 .bSourceID = USB_OUT_IT_ID, 712 .bCSourceID = USB_OUT_CLK_ID, 713 .bmControls = (CONTROL_RDWR << COPY_CTRL), 714 }; 715 716 static struct uac2_ac_header_descriptor ac_hdr_desc = { 717 .bLength = sizeof ac_hdr_desc, 718 .bDescriptorType = USB_DT_CS_INTERFACE, 719 720 .bDescriptorSubtype = UAC_MS_HEADER, 721 .bcdADC = cpu_to_le16(0x200), 722 .bCategory = UAC2_FUNCTION_IO_BOX, 723 .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc 724 + sizeof usb_out_it_desc + sizeof io_in_it_desc 725 + sizeof usb_in_ot_desc + sizeof io_out_ot_desc, 726 .bmControls = 0, 727 }; 728 729 /* Audio Streaming OUT Interface - Alt0 */ 730 static struct usb_interface_descriptor std_as_out_if0_desc = { 731 .bLength = sizeof std_as_out_if0_desc, 732 .bDescriptorType = USB_DT_INTERFACE, 733 734 .bAlternateSetting = 0, 735 .bNumEndpoints = 0, 736 .bInterfaceClass = USB_CLASS_AUDIO, 737 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 738 .bInterfaceProtocol = UAC_VERSION_2, 739 }; 740 741 /* Audio Streaming OUT Interface - Alt1 */ 742 static struct usb_interface_descriptor std_as_out_if1_desc = { 743 .bLength = sizeof std_as_out_if1_desc, 744 .bDescriptorType = USB_DT_INTERFACE, 745 746 .bAlternateSetting = 1, 747 .bNumEndpoints = 1, 748 .bInterfaceClass = USB_CLASS_AUDIO, 749 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 750 .bInterfaceProtocol = UAC_VERSION_2, 751 }; 752 753 /* Audio Stream OUT Intface Desc */ 754 static struct uac2_as_header_descriptor as_out_hdr_desc = { 755 .bLength = sizeof as_out_hdr_desc, 756 .bDescriptorType = USB_DT_CS_INTERFACE, 757 758 .bDescriptorSubtype = UAC_AS_GENERAL, 759 .bTerminalLink = USB_OUT_IT_ID, 760 .bmControls = 0, 761 .bFormatType = UAC_FORMAT_TYPE_I, 762 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 763 .iChannelNames = 0, 764 }; 765 766 /* Audio USB_OUT Format */ 767 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = { 768 .bLength = sizeof as_out_fmt1_desc, 769 .bDescriptorType = USB_DT_CS_INTERFACE, 770 .bDescriptorSubtype = UAC_FORMAT_TYPE, 771 .bFormatType = UAC_FORMAT_TYPE_I, 772 }; 773 774 /* STD AS ISO OUT Endpoint */ 775 static struct usb_endpoint_descriptor fs_epout_desc = { 776 .bLength = USB_DT_ENDPOINT_SIZE, 777 .bDescriptorType = USB_DT_ENDPOINT, 778 779 .bEndpointAddress = USB_DIR_OUT, 780 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 781 .wMaxPacketSize = cpu_to_le16(1023), 782 .bInterval = 1, 783 }; 784 785 static struct usb_endpoint_descriptor hs_epout_desc = { 786 .bLength = USB_DT_ENDPOINT_SIZE, 787 .bDescriptorType = USB_DT_ENDPOINT, 788 789 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 790 .wMaxPacketSize = cpu_to_le16(1024), 791 .bInterval = 4, 792 }; 793 794 /* CS AS ISO OUT Endpoint */ 795 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = { 796 .bLength = sizeof as_iso_out_desc, 797 .bDescriptorType = USB_DT_CS_ENDPOINT, 798 799 .bDescriptorSubtype = UAC_EP_GENERAL, 800 .bmAttributes = 0, 801 .bmControls = 0, 802 .bLockDelayUnits = 0, 803 .wLockDelay = 0, 804 }; 805 806 /* Audio Streaming IN Interface - Alt0 */ 807 static struct usb_interface_descriptor std_as_in_if0_desc = { 808 .bLength = sizeof std_as_in_if0_desc, 809 .bDescriptorType = USB_DT_INTERFACE, 810 811 .bAlternateSetting = 0, 812 .bNumEndpoints = 0, 813 .bInterfaceClass = USB_CLASS_AUDIO, 814 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 815 .bInterfaceProtocol = UAC_VERSION_2, 816 }; 817 818 /* Audio Streaming IN Interface - Alt1 */ 819 static struct usb_interface_descriptor std_as_in_if1_desc = { 820 .bLength = sizeof std_as_in_if1_desc, 821 .bDescriptorType = USB_DT_INTERFACE, 822 823 .bAlternateSetting = 1, 824 .bNumEndpoints = 1, 825 .bInterfaceClass = USB_CLASS_AUDIO, 826 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 827 .bInterfaceProtocol = UAC_VERSION_2, 828 }; 829 830 /* Audio Stream IN Intface Desc */ 831 static struct uac2_as_header_descriptor as_in_hdr_desc = { 832 .bLength = sizeof as_in_hdr_desc, 833 .bDescriptorType = USB_DT_CS_INTERFACE, 834 835 .bDescriptorSubtype = UAC_AS_GENERAL, 836 .bTerminalLink = USB_IN_OT_ID, 837 .bmControls = 0, 838 .bFormatType = UAC_FORMAT_TYPE_I, 839 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 840 .iChannelNames = 0, 841 }; 842 843 /* Audio USB_IN Format */ 844 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = { 845 .bLength = sizeof as_in_fmt1_desc, 846 .bDescriptorType = USB_DT_CS_INTERFACE, 847 .bDescriptorSubtype = UAC_FORMAT_TYPE, 848 .bFormatType = UAC_FORMAT_TYPE_I, 849 }; 850 851 /* STD AS ISO IN Endpoint */ 852 static struct usb_endpoint_descriptor fs_epin_desc = { 853 .bLength = USB_DT_ENDPOINT_SIZE, 854 .bDescriptorType = USB_DT_ENDPOINT, 855 856 .bEndpointAddress = USB_DIR_IN, 857 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 858 .wMaxPacketSize = cpu_to_le16(1023), 859 .bInterval = 1, 860 }; 861 862 static struct usb_endpoint_descriptor hs_epin_desc = { 863 .bLength = USB_DT_ENDPOINT_SIZE, 864 .bDescriptorType = USB_DT_ENDPOINT, 865 866 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 867 .wMaxPacketSize = cpu_to_le16(1024), 868 .bInterval = 4, 869 }; 870 871 /* CS AS ISO IN Endpoint */ 872 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = { 873 .bLength = sizeof as_iso_in_desc, 874 .bDescriptorType = USB_DT_CS_ENDPOINT, 875 876 .bDescriptorSubtype = UAC_EP_GENERAL, 877 .bmAttributes = 0, 878 .bmControls = 0, 879 .bLockDelayUnits = 0, 880 .wLockDelay = 0, 881 }; 882 883 static struct usb_descriptor_header *fs_audio_desc[] = { 884 (struct usb_descriptor_header *)&iad_desc, 885 (struct usb_descriptor_header *)&std_ac_if_desc, 886 887 (struct usb_descriptor_header *)&ac_hdr_desc, 888 (struct usb_descriptor_header *)&in_clk_src_desc, 889 (struct usb_descriptor_header *)&out_clk_src_desc, 890 (struct usb_descriptor_header *)&usb_out_it_desc, 891 (struct usb_descriptor_header *)&io_in_it_desc, 892 (struct usb_descriptor_header *)&usb_in_ot_desc, 893 (struct usb_descriptor_header *)&io_out_ot_desc, 894 895 (struct usb_descriptor_header *)&std_as_out_if0_desc, 896 (struct usb_descriptor_header *)&std_as_out_if1_desc, 897 898 (struct usb_descriptor_header *)&as_out_hdr_desc, 899 (struct usb_descriptor_header *)&as_out_fmt1_desc, 900 (struct usb_descriptor_header *)&fs_epout_desc, 901 (struct usb_descriptor_header *)&as_iso_out_desc, 902 903 (struct usb_descriptor_header *)&std_as_in_if0_desc, 904 (struct usb_descriptor_header *)&std_as_in_if1_desc, 905 906 (struct usb_descriptor_header *)&as_in_hdr_desc, 907 (struct usb_descriptor_header *)&as_in_fmt1_desc, 908 (struct usb_descriptor_header *)&fs_epin_desc, 909 (struct usb_descriptor_header *)&as_iso_in_desc, 910 NULL, 911 }; 912 913 static struct usb_descriptor_header *hs_audio_desc[] = { 914 (struct usb_descriptor_header *)&iad_desc, 915 (struct usb_descriptor_header *)&std_ac_if_desc, 916 917 (struct usb_descriptor_header *)&ac_hdr_desc, 918 (struct usb_descriptor_header *)&in_clk_src_desc, 919 (struct usb_descriptor_header *)&out_clk_src_desc, 920 (struct usb_descriptor_header *)&usb_out_it_desc, 921 (struct usb_descriptor_header *)&io_in_it_desc, 922 (struct usb_descriptor_header *)&usb_in_ot_desc, 923 (struct usb_descriptor_header *)&io_out_ot_desc, 924 925 (struct usb_descriptor_header *)&std_as_out_if0_desc, 926 (struct usb_descriptor_header *)&std_as_out_if1_desc, 927 928 (struct usb_descriptor_header *)&as_out_hdr_desc, 929 (struct usb_descriptor_header *)&as_out_fmt1_desc, 930 (struct usb_descriptor_header *)&hs_epout_desc, 931 (struct usb_descriptor_header *)&as_iso_out_desc, 932 933 (struct usb_descriptor_header *)&std_as_in_if0_desc, 934 (struct usb_descriptor_header *)&std_as_in_if1_desc, 935 936 (struct usb_descriptor_header *)&as_in_hdr_desc, 937 (struct usb_descriptor_header *)&as_in_fmt1_desc, 938 (struct usb_descriptor_header *)&hs_epin_desc, 939 (struct usb_descriptor_header *)&as_iso_in_desc, 940 NULL, 941 }; 942 943 struct cntrl_cur_lay3 { 944 __u32 dCUR; 945 }; 946 947 struct cntrl_range_lay3 { 948 __u16 wNumSubRanges; 949 __u32 dMIN; 950 __u32 dMAX; 951 __u32 dRES; 952 } __packed; 953 954 static inline void 955 free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep) 956 { 957 struct snd_uac2_chip *uac2 = prm->uac2; 958 int i; 959 960 if (!prm->ep_enabled) 961 return; 962 963 prm->ep_enabled = false; 964 965 for (i = 0; i < USB_XFERS; i++) { 966 if (prm->ureq[i].req) { 967 usb_ep_dequeue(ep, prm->ureq[i].req); 968 usb_ep_free_request(ep, prm->ureq[i].req); 969 prm->ureq[i].req = NULL; 970 } 971 } 972 973 if (usb_ep_disable(ep)) 974 dev_err(&uac2->pdev.dev, 975 "%s:%d Error!\n", __func__, __LINE__); 976 } 977 978 static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, 979 struct usb_endpoint_descriptor *ep_desc, 980 unsigned int factor, bool is_playback) 981 { 982 int chmask, srate, ssize; 983 u16 max_packet_size; 984 985 if (is_playback) { 986 chmask = uac2_opts->p_chmask; 987 srate = uac2_opts->p_srate; 988 ssize = uac2_opts->p_ssize; 989 } else { 990 chmask = uac2_opts->c_chmask; 991 srate = uac2_opts->c_srate; 992 ssize = uac2_opts->c_ssize; 993 } 994 995 max_packet_size = num_channels(chmask) * ssize * 996 DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))); 997 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size, 998 le16_to_cpu(ep_desc->wMaxPacketSize))); 999 } 1000 1001 static int 1002 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) 1003 { 1004 struct audio_dev *agdev = func_to_agdev(fn); 1005 struct snd_uac2_chip *uac2 = &agdev->uac2; 1006 struct usb_composite_dev *cdev = cfg->cdev; 1007 struct usb_gadget *gadget = cdev->gadget; 1008 struct device *dev = &uac2->pdev.dev; 1009 struct uac2_rtd_params *prm; 1010 struct f_uac2_opts *uac2_opts; 1011 struct usb_string *us; 1012 int ret; 1013 1014 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst); 1015 1016 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn)); 1017 if (IS_ERR(us)) 1018 return PTR_ERR(us); 1019 iad_desc.iFunction = us[STR_ASSOC].id; 1020 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id; 1021 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id; 1022 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id; 1023 usb_out_it_desc.iTerminal = us[STR_USB_IT].id; 1024 io_in_it_desc.iTerminal = us[STR_IO_IT].id; 1025 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id; 1026 io_out_ot_desc.iTerminal = us[STR_IO_OT].id; 1027 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id; 1028 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id; 1029 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id; 1030 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id; 1031 1032 1033 /* Initialize the configurable parameters */ 1034 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1035 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1036 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1037 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1038 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1039 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1040 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1041 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1042 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize; 1043 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8; 1044 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize; 1045 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8; 1046 1047 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate); 1048 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate); 1049 1050 ret = usb_interface_id(cfg, fn); 1051 if (ret < 0) { 1052 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1053 return ret; 1054 } 1055 std_ac_if_desc.bInterfaceNumber = ret; 1056 agdev->ac_intf = ret; 1057 agdev->ac_alt = 0; 1058 1059 ret = usb_interface_id(cfg, fn); 1060 if (ret < 0) { 1061 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1062 return ret; 1063 } 1064 std_as_out_if0_desc.bInterfaceNumber = ret; 1065 std_as_out_if1_desc.bInterfaceNumber = ret; 1066 agdev->as_out_intf = ret; 1067 agdev->as_out_alt = 0; 1068 1069 ret = usb_interface_id(cfg, fn); 1070 if (ret < 0) { 1071 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1072 return ret; 1073 } 1074 std_as_in_if0_desc.bInterfaceNumber = ret; 1075 std_as_in_if1_desc.bInterfaceNumber = ret; 1076 agdev->as_in_intf = ret; 1077 agdev->as_in_alt = 0; 1078 1079 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc); 1080 if (!agdev->out_ep) { 1081 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1082 goto err; 1083 } 1084 1085 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); 1086 if (!agdev->in_ep) { 1087 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1088 goto err; 1089 } 1090 1091 uac2->p_prm.uac2 = uac2; 1092 uac2->c_prm.uac2 = uac2; 1093 1094 /* Calculate wMaxPacketSize according to audio bandwidth */ 1095 set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true); 1096 set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false); 1097 set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true); 1098 set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false); 1099 1100 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; 1101 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; 1102 1103 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL, 1104 NULL); 1105 if (ret) 1106 goto err; 1107 1108 prm = &agdev->uac2.c_prm; 1109 prm->max_psize = hs_epout_desc.wMaxPacketSize; 1110 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL); 1111 if (!prm->rbuf) { 1112 prm->max_psize = 0; 1113 goto err_free_descs; 1114 } 1115 1116 prm = &agdev->uac2.p_prm; 1117 prm->max_psize = hs_epin_desc.wMaxPacketSize; 1118 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL); 1119 if (!prm->rbuf) { 1120 prm->max_psize = 0; 1121 goto err_free_descs; 1122 } 1123 1124 ret = alsa_uac2_init(agdev); 1125 if (ret) 1126 goto err_free_descs; 1127 return 0; 1128 1129 err_free_descs: 1130 usb_free_all_descriptors(fn); 1131 err: 1132 kfree(agdev->uac2.p_prm.rbuf); 1133 kfree(agdev->uac2.c_prm.rbuf); 1134 return -EINVAL; 1135 } 1136 1137 static int 1138 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) 1139 { 1140 struct usb_composite_dev *cdev = fn->config->cdev; 1141 struct audio_dev *agdev = func_to_agdev(fn); 1142 struct snd_uac2_chip *uac2 = &agdev->uac2; 1143 struct usb_gadget *gadget = cdev->gadget; 1144 struct device *dev = &uac2->pdev.dev; 1145 struct usb_request *req; 1146 struct usb_ep *ep; 1147 struct uac2_rtd_params *prm; 1148 int req_len, i; 1149 1150 /* No i/f has more than 2 alt settings */ 1151 if (alt > 1) { 1152 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1153 return -EINVAL; 1154 } 1155 1156 if (intf == agdev->ac_intf) { 1157 /* Control I/f has only 1 AltSetting - 0 */ 1158 if (alt) { 1159 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1160 return -EINVAL; 1161 } 1162 return 0; 1163 } 1164 1165 if (intf == agdev->as_out_intf) { 1166 ep = agdev->out_ep; 1167 prm = &uac2->c_prm; 1168 config_ep_by_speed(gadget, fn, ep); 1169 agdev->as_out_alt = alt; 1170 req_len = prm->max_psize; 1171 } else if (intf == agdev->as_in_intf) { 1172 struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev); 1173 unsigned int factor, rate; 1174 struct usb_endpoint_descriptor *ep_desc; 1175 1176 ep = agdev->in_ep; 1177 prm = &uac2->p_prm; 1178 config_ep_by_speed(gadget, fn, ep); 1179 agdev->as_in_alt = alt; 1180 1181 /* pre-calculate the playback endpoint's interval */ 1182 if (gadget->speed == USB_SPEED_FULL) { 1183 ep_desc = &fs_epin_desc; 1184 factor = 1000; 1185 } else { 1186 ep_desc = &hs_epin_desc; 1187 factor = 8000; 1188 } 1189 1190 /* pre-compute some values for iso_complete() */ 1191 uac2->p_framesize = opts->p_ssize * 1192 num_channels(opts->p_chmask); 1193 rate = opts->p_srate * uac2->p_framesize; 1194 uac2->p_interval = factor / (1 << (ep_desc->bInterval - 1)); 1195 uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval, 1196 prm->max_psize); 1197 1198 if (uac2->p_pktsize < prm->max_psize) 1199 uac2->p_pktsize_residue = rate % uac2->p_interval; 1200 else 1201 uac2->p_pktsize_residue = 0; 1202 1203 req_len = uac2->p_pktsize; 1204 uac2->p_residue = 0; 1205 } else { 1206 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1207 return -EINVAL; 1208 } 1209 1210 if (alt == 0) { 1211 free_ep(prm, ep); 1212 return 0; 1213 } 1214 1215 prm->ep_enabled = true; 1216 usb_ep_enable(ep); 1217 1218 for (i = 0; i < USB_XFERS; i++) { 1219 if (!prm->ureq[i].req) { 1220 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 1221 if (req == NULL) 1222 return -ENOMEM; 1223 1224 prm->ureq[i].req = req; 1225 prm->ureq[i].pp = prm; 1226 1227 req->zero = 0; 1228 req->context = &prm->ureq[i]; 1229 req->length = req_len; 1230 req->complete = agdev_iso_complete; 1231 req->buf = prm->rbuf + i * prm->max_psize; 1232 } 1233 1234 if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC)) 1235 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1236 } 1237 1238 return 0; 1239 } 1240 1241 static int 1242 afunc_get_alt(struct usb_function *fn, unsigned intf) 1243 { 1244 struct audio_dev *agdev = func_to_agdev(fn); 1245 struct snd_uac2_chip *uac2 = &agdev->uac2; 1246 1247 if (intf == agdev->ac_intf) 1248 return agdev->ac_alt; 1249 else if (intf == agdev->as_out_intf) 1250 return agdev->as_out_alt; 1251 else if (intf == agdev->as_in_intf) 1252 return agdev->as_in_alt; 1253 else 1254 dev_err(&uac2->pdev.dev, 1255 "%s:%d Invalid Interface %d!\n", 1256 __func__, __LINE__, intf); 1257 1258 return -EINVAL; 1259 } 1260 1261 static void 1262 afunc_disable(struct usb_function *fn) 1263 { 1264 struct audio_dev *agdev = func_to_agdev(fn); 1265 struct snd_uac2_chip *uac2 = &agdev->uac2; 1266 1267 free_ep(&uac2->p_prm, agdev->in_ep); 1268 agdev->as_in_alt = 0; 1269 1270 free_ep(&uac2->c_prm, agdev->out_ep); 1271 agdev->as_out_alt = 0; 1272 } 1273 1274 static int 1275 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1276 { 1277 struct usb_request *req = fn->config->cdev->req; 1278 struct audio_dev *agdev = func_to_agdev(fn); 1279 struct snd_uac2_chip *uac2 = &agdev->uac2; 1280 struct f_uac2_opts *opts; 1281 u16 w_length = le16_to_cpu(cr->wLength); 1282 u16 w_index = le16_to_cpu(cr->wIndex); 1283 u16 w_value = le16_to_cpu(cr->wValue); 1284 u8 entity_id = (w_index >> 8) & 0xff; 1285 u8 control_selector = w_value >> 8; 1286 int value = -EOPNOTSUPP; 1287 int p_srate, c_srate; 1288 1289 opts = agdev_to_uac2_opts(agdev); 1290 p_srate = opts->p_srate; 1291 c_srate = opts->c_srate; 1292 1293 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1294 struct cntrl_cur_lay3 c; 1295 1296 if (entity_id == USB_IN_CLK_ID) 1297 c.dCUR = p_srate; 1298 else if (entity_id == USB_OUT_CLK_ID) 1299 c.dCUR = c_srate; 1300 1301 value = min_t(unsigned, w_length, sizeof c); 1302 memcpy(req->buf, &c, value); 1303 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) { 1304 *(u8 *)req->buf = 1; 1305 value = min_t(unsigned, w_length, 1); 1306 } else { 1307 dev_err(&uac2->pdev.dev, 1308 "%s:%d control_selector=%d TODO!\n", 1309 __func__, __LINE__, control_selector); 1310 } 1311 1312 return value; 1313 } 1314 1315 static int 1316 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1317 { 1318 struct usb_request *req = fn->config->cdev->req; 1319 struct audio_dev *agdev = func_to_agdev(fn); 1320 struct snd_uac2_chip *uac2 = &agdev->uac2; 1321 struct f_uac2_opts *opts; 1322 u16 w_length = le16_to_cpu(cr->wLength); 1323 u16 w_index = le16_to_cpu(cr->wIndex); 1324 u16 w_value = le16_to_cpu(cr->wValue); 1325 u8 entity_id = (w_index >> 8) & 0xff; 1326 u8 control_selector = w_value >> 8; 1327 struct cntrl_range_lay3 r; 1328 int value = -EOPNOTSUPP; 1329 int p_srate, c_srate; 1330 1331 opts = agdev_to_uac2_opts(agdev); 1332 p_srate = opts->p_srate; 1333 c_srate = opts->c_srate; 1334 1335 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1336 if (entity_id == USB_IN_CLK_ID) 1337 r.dMIN = p_srate; 1338 else if (entity_id == USB_OUT_CLK_ID) 1339 r.dMIN = c_srate; 1340 else 1341 return -EOPNOTSUPP; 1342 1343 r.dMAX = r.dMIN; 1344 r.dRES = 0; 1345 r.wNumSubRanges = 1; 1346 1347 value = min_t(unsigned, w_length, sizeof r); 1348 memcpy(req->buf, &r, value); 1349 } else { 1350 dev_err(&uac2->pdev.dev, 1351 "%s:%d control_selector=%d TODO!\n", 1352 __func__, __LINE__, control_selector); 1353 } 1354 1355 return value; 1356 } 1357 1358 static int 1359 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1360 { 1361 if (cr->bRequest == UAC2_CS_CUR) 1362 return in_rq_cur(fn, cr); 1363 else if (cr->bRequest == UAC2_CS_RANGE) 1364 return in_rq_range(fn, cr); 1365 else 1366 return -EOPNOTSUPP; 1367 } 1368 1369 static int 1370 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1371 { 1372 u16 w_length = le16_to_cpu(cr->wLength); 1373 u16 w_value = le16_to_cpu(cr->wValue); 1374 u8 control_selector = w_value >> 8; 1375 1376 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) 1377 return w_length; 1378 1379 return -EOPNOTSUPP; 1380 } 1381 1382 static int 1383 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1384 { 1385 struct audio_dev *agdev = func_to_agdev(fn); 1386 struct snd_uac2_chip *uac2 = &agdev->uac2; 1387 u16 w_index = le16_to_cpu(cr->wIndex); 1388 u8 intf = w_index & 0xff; 1389 1390 if (intf != agdev->ac_intf) { 1391 dev_err(&uac2->pdev.dev, 1392 "%s:%d Error!\n", __func__, __LINE__); 1393 return -EOPNOTSUPP; 1394 } 1395 1396 if (cr->bRequestType & USB_DIR_IN) 1397 return ac_rq_in(fn, cr); 1398 else if (cr->bRequest == UAC2_CS_CUR) 1399 return out_rq_cur(fn, cr); 1400 1401 return -EOPNOTSUPP; 1402 } 1403 1404 static int 1405 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1406 { 1407 struct usb_composite_dev *cdev = fn->config->cdev; 1408 struct audio_dev *agdev = func_to_agdev(fn); 1409 struct snd_uac2_chip *uac2 = &agdev->uac2; 1410 struct usb_request *req = cdev->req; 1411 u16 w_length = le16_to_cpu(cr->wLength); 1412 int value = -EOPNOTSUPP; 1413 1414 /* Only Class specific requests are supposed to reach here */ 1415 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) 1416 return -EOPNOTSUPP; 1417 1418 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) 1419 value = setup_rq_inf(fn, cr); 1420 else 1421 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__); 1422 1423 if (value >= 0) { 1424 req->length = value; 1425 req->zero = value < w_length; 1426 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 1427 if (value < 0) { 1428 dev_err(&uac2->pdev.dev, 1429 "%s:%d Error!\n", __func__, __LINE__); 1430 req->status = 0; 1431 } 1432 } 1433 1434 return value; 1435 } 1436 1437 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item) 1438 { 1439 return container_of(to_config_group(item), struct f_uac2_opts, 1440 func_inst.group); 1441 } 1442 1443 static void f_uac2_attr_release(struct config_item *item) 1444 { 1445 struct f_uac2_opts *opts = to_f_uac2_opts(item); 1446 1447 usb_put_function_instance(&opts->func_inst); 1448 } 1449 1450 static struct configfs_item_operations f_uac2_item_ops = { 1451 .release = f_uac2_attr_release, 1452 }; 1453 1454 #define UAC2_ATTRIBUTE(name) \ 1455 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 1456 char *page) \ 1457 { \ 1458 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1459 int result; \ 1460 \ 1461 mutex_lock(&opts->lock); \ 1462 result = sprintf(page, "%u\n", opts->name); \ 1463 mutex_unlock(&opts->lock); \ 1464 \ 1465 return result; \ 1466 } \ 1467 \ 1468 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 1469 const char *page, size_t len) \ 1470 { \ 1471 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1472 int ret; \ 1473 u32 num; \ 1474 \ 1475 mutex_lock(&opts->lock); \ 1476 if (opts->refcnt) { \ 1477 ret = -EBUSY; \ 1478 goto end; \ 1479 } \ 1480 \ 1481 ret = kstrtou32(page, 0, &num); \ 1482 if (ret) \ 1483 goto end; \ 1484 \ 1485 opts->name = num; \ 1486 ret = len; \ 1487 \ 1488 end: \ 1489 mutex_unlock(&opts->lock); \ 1490 return ret; \ 1491 } \ 1492 \ 1493 CONFIGFS_ATTR(f_uac2_opts_, name) 1494 1495 UAC2_ATTRIBUTE(p_chmask); 1496 UAC2_ATTRIBUTE(p_srate); 1497 UAC2_ATTRIBUTE(p_ssize); 1498 UAC2_ATTRIBUTE(c_chmask); 1499 UAC2_ATTRIBUTE(c_srate); 1500 UAC2_ATTRIBUTE(c_ssize); 1501 1502 static struct configfs_attribute *f_uac2_attrs[] = { 1503 &f_uac2_opts_attr_p_chmask, 1504 &f_uac2_opts_attr_p_srate, 1505 &f_uac2_opts_attr_p_ssize, 1506 &f_uac2_opts_attr_c_chmask, 1507 &f_uac2_opts_attr_c_srate, 1508 &f_uac2_opts_attr_c_ssize, 1509 NULL, 1510 }; 1511 1512 static struct config_item_type f_uac2_func_type = { 1513 .ct_item_ops = &f_uac2_item_ops, 1514 .ct_attrs = f_uac2_attrs, 1515 .ct_owner = THIS_MODULE, 1516 }; 1517 1518 static void afunc_free_inst(struct usb_function_instance *f) 1519 { 1520 struct f_uac2_opts *opts; 1521 1522 opts = container_of(f, struct f_uac2_opts, func_inst); 1523 kfree(opts); 1524 } 1525 1526 static struct usb_function_instance *afunc_alloc_inst(void) 1527 { 1528 struct f_uac2_opts *opts; 1529 1530 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1531 if (!opts) 1532 return ERR_PTR(-ENOMEM); 1533 1534 mutex_init(&opts->lock); 1535 opts->func_inst.free_func_inst = afunc_free_inst; 1536 1537 config_group_init_type_name(&opts->func_inst.group, "", 1538 &f_uac2_func_type); 1539 1540 opts->p_chmask = UAC2_DEF_PCHMASK; 1541 opts->p_srate = UAC2_DEF_PSRATE; 1542 opts->p_ssize = UAC2_DEF_PSSIZE; 1543 opts->c_chmask = UAC2_DEF_CCHMASK; 1544 opts->c_srate = UAC2_DEF_CSRATE; 1545 opts->c_ssize = UAC2_DEF_CSSIZE; 1546 return &opts->func_inst; 1547 } 1548 1549 static void afunc_free(struct usb_function *f) 1550 { 1551 struct audio_dev *agdev; 1552 struct f_uac2_opts *opts; 1553 1554 agdev = func_to_agdev(f); 1555 opts = container_of(f->fi, struct f_uac2_opts, func_inst); 1556 kfree(agdev); 1557 mutex_lock(&opts->lock); 1558 --opts->refcnt; 1559 mutex_unlock(&opts->lock); 1560 } 1561 1562 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f) 1563 { 1564 struct audio_dev *agdev = func_to_agdev(f); 1565 struct uac2_rtd_params *prm; 1566 1567 alsa_uac2_exit(agdev); 1568 1569 prm = &agdev->uac2.p_prm; 1570 kfree(prm->rbuf); 1571 1572 prm = &agdev->uac2.c_prm; 1573 kfree(prm->rbuf); 1574 usb_free_all_descriptors(f); 1575 } 1576 1577 static struct usb_function *afunc_alloc(struct usb_function_instance *fi) 1578 { 1579 struct audio_dev *agdev; 1580 struct f_uac2_opts *opts; 1581 1582 agdev = kzalloc(sizeof(*agdev), GFP_KERNEL); 1583 if (agdev == NULL) 1584 return ERR_PTR(-ENOMEM); 1585 1586 opts = container_of(fi, struct f_uac2_opts, func_inst); 1587 mutex_lock(&opts->lock); 1588 ++opts->refcnt; 1589 mutex_unlock(&opts->lock); 1590 1591 agdev->func.name = "uac2_func"; 1592 agdev->func.bind = afunc_bind; 1593 agdev->func.unbind = afunc_unbind; 1594 agdev->func.set_alt = afunc_set_alt; 1595 agdev->func.get_alt = afunc_get_alt; 1596 agdev->func.disable = afunc_disable; 1597 agdev->func.setup = afunc_setup; 1598 agdev->func.free_func = afunc_free; 1599 1600 return &agdev->func; 1601 } 1602 1603 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); 1604 MODULE_LICENSE("GPL"); 1605 MODULE_AUTHOR("Yadwinder Singh"); 1606 MODULE_AUTHOR("Jaswinder Singh"); 1607