1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de> 4 */ 5 6#include <linux/usb.h> 7#include <linux/gfp.h> 8 9#include "usb_stream.h" 10 11/* setup */ 12 13static unsigned int usb_stream_next_packet_size(struct usb_stream_kernel *sk) 14{ 15 struct usb_stream *s = sk->s; 16 17 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; 18 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; 19} 20 21static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) 22{ 23 struct usb_stream *s = sk->s; 24 int pack, lb = 0; 25 26 for (pack = 0; pack < sk->n_o_ps; pack++) { 27 int l = usb_stream_next_packet_size(sk); 28 29 if (s->idle_outsize + lb + l > s->period_size) 30 goto check; 31 32 sk->out_phase = sk->out_phase_peeked; 33 urb->iso_frame_desc[pack].offset = lb; 34 urb->iso_frame_desc[pack].length = l; 35 lb += l; 36 } 37 snd_printdd(KERN_DEBUG "%i\n", lb); 38 39check: 40 urb->number_of_packets = pack; 41 urb->transfer_buffer_length = lb; 42 s->idle_outsize += lb - s->period_size; 43 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, 44 lb, s->period_size); 45} 46 47static int init_pipe_urbs(struct usb_stream_kernel *sk, 48 unsigned int use_packsize, 49 struct urb **urbs, char *transfer, 50 struct usb_device *dev, int pipe) 51{ 52 int u, p; 53 int maxpacket = use_packsize ? 54 use_packsize : usb_maxpacket(dev, pipe); 55 int transfer_length = maxpacket * sk->n_o_ps; 56 57 for (u = 0; u < USB_STREAM_NURBS; 58 ++u, transfer += transfer_length) { 59 struct urb *urb = urbs[u]; 60 struct usb_iso_packet_descriptor *desc; 61 62 urb->transfer_buffer = transfer; 63 urb->dev = dev; 64 urb->pipe = pipe; 65 urb->number_of_packets = sk->n_o_ps; 66 urb->context = sk; 67 urb->interval = 1; 68 if (usb_pipeout(pipe)) 69 continue; 70 if (usb_urb_ep_type_check(urb)) 71 return -EINVAL; 72 73 urb->transfer_buffer_length = transfer_length; 74 desc = urb->iso_frame_desc; 75 desc->offset = 0; 76 desc->length = maxpacket; 77 for (p = 1; p < sk->n_o_ps; ++p) { 78 desc[p].offset = desc[p - 1].offset + maxpacket; 79 desc[p].length = maxpacket; 80 } 81 } 82 83 return 0; 84} 85 86static int init_urbs(struct usb_stream_kernel *sk, unsigned int use_packsize, 87 struct usb_device *dev, int in_pipe, int out_pipe) 88{ 89 struct usb_stream *s = sk->s; 90 char *indata = 91 (char *)s + sizeof(*s) + sizeof(struct usb_stream_packet) * s->inpackets; 92 int u; 93 94 for (u = 0; u < USB_STREAM_NURBS; ++u) { 95 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 96 if (!sk->inurb[u]) 97 return -ENOMEM; 98 99 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 100 if (!sk->outurb[u]) 101 return -ENOMEM; 102 } 103 104 if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) || 105 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, 106 out_pipe)) 107 return -EINVAL; 108 109 return 0; 110} 111 112/* 113 * convert a sampling rate into our full speed format (fs/1000 in Q16.16) 114 * this will overflow at approx 524 kHz 115 */ 116static inline unsigned int get_usb_full_speed_rate(unsigned int rate) 117{ 118 return ((rate << 13) + 62) / 125; 119} 120 121/* 122 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) 123 * this will overflow at approx 4 MHz 124 */ 125static inline unsigned int get_usb_high_speed_rate(unsigned int rate) 126{ 127 return ((rate << 10) + 62) / 125; 128} 129 130void usb_stream_free(struct usb_stream_kernel *sk) 131{ 132 struct usb_stream *s; 133 unsigned int u; 134 135 for (u = 0; u < USB_STREAM_NURBS; ++u) { 136 usb_free_urb(sk->inurb[u]); 137 sk->inurb[u] = NULL; 138 usb_free_urb(sk->outurb[u]); 139 sk->outurb[u] = NULL; 140 } 141 142 s = sk->s; 143 if (!s) 144 return; 145 146 if (sk->write_page) { 147 free_pages_exact(sk->write_page, s->write_size); 148 sk->write_page = NULL; 149 } 150 151 free_pages_exact(s, s->read_size); 152 sk->s = NULL; 153} 154 155struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, 156 struct usb_device *dev, 157 unsigned int in_endpoint, 158 unsigned int out_endpoint, 159 unsigned int sample_rate, 160 unsigned int use_packsize, 161 unsigned int period_frames, 162 unsigned int frame_size) 163{ 164 int packets, max_packsize; 165 int in_pipe, out_pipe; 166 int read_size = sizeof(struct usb_stream); 167 int write_size; 168 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; 169 170 in_pipe = usb_rcvisocpipe(dev, in_endpoint); 171 out_pipe = usb_sndisocpipe(dev, out_endpoint); 172 173 max_packsize = use_packsize ? 174 use_packsize : usb_maxpacket(dev, in_pipe); 175 176 /* 177 t_period = period_frames / sample_rate 178 iso_packs = t_period / t_iso_frame 179 = (period_frames / sample_rate) * (1 / t_iso_frame) 180 */ 181 182 packets = period_frames * usb_frames / sample_rate + 1; 183 184 if (dev->speed == USB_SPEED_HIGH) 185 packets = (packets + 7) & ~7; 186 187 read_size += packets * USB_STREAM_URBDEPTH * 188 (max_packsize + sizeof(struct usb_stream_packet)); 189 190 max_packsize = usb_maxpacket(dev, out_pipe); 191 write_size = max_packsize * packets * USB_STREAM_URBDEPTH; 192 193 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { 194 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n"); 195 goto out; 196 } 197 198 sk->s = alloc_pages_exact(read_size, 199 GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); 200 if (!sk->s) { 201 pr_warn("us122l: couldn't allocate read buffer\n"); 202 goto out; 203 } 204 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; 205 206 sk->s->read_size = read_size; 207 208 sk->s->cfg.sample_rate = sample_rate; 209 sk->s->cfg.frame_size = frame_size; 210 sk->n_o_ps = packets; 211 sk->s->inpackets = packets * USB_STREAM_URBDEPTH; 212 sk->s->cfg.period_frames = period_frames; 213 sk->s->period_size = frame_size * period_frames; 214 215 sk->s->write_size = write_size; 216 217 sk->write_page = alloc_pages_exact(write_size, 218 GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); 219 if (!sk->write_page) { 220 pr_warn("us122l: couldn't allocate write buffer\n"); 221 usb_stream_free(sk); 222 return NULL; 223 } 224 225 /* calculate the frequency in 16.16 format */ 226 if (dev->speed == USB_SPEED_FULL) 227 sk->freqn = get_usb_full_speed_rate(sample_rate); 228 else 229 sk->freqn = get_usb_high_speed_rate(sample_rate); 230 231 if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) { 232 usb_stream_free(sk); 233 return NULL; 234 } 235 236 sk->s->state = usb_stream_stopped; 237out: 238 return sk->s; 239} 240 241/* start */ 242 243static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) 244{ 245 bool r; 246 247 if (unlikely(urb->status)) { 248 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) 249 snd_printk(KERN_WARNING "status=%i\n", urb->status); 250 sk->iso_frame_balance = 0x7FFFFFFF; 251 return false; 252 } 253 r = sk->iso_frame_balance == 0; 254 if (!r) 255 sk->i_urb = urb; 256 return r; 257} 258 259static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) 260{ 261 sk->iso_frame_balance += urb->number_of_packets; 262 return balance_check(sk, urb); 263} 264 265static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) 266{ 267 sk->iso_frame_balance -= urb->number_of_packets; 268 return balance_check(sk, urb); 269} 270 271static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) 272{ 273 int u; 274 275 for (u = 0; u < USB_STREAM_NURBS; u++) { 276 struct urb *urb = urbs[u]; 277 278 urb->complete = complete; 279 } 280} 281 282static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, 283 struct urb *inurb) 284{ 285 struct usb_stream *s = sk->s; 286 struct urb *io; 287 struct usb_iso_packet_descriptor *id, *od; 288 int p = 0, lb = 0, l = 0; 289 290 io = sk->idle_outurb; 291 od = io->iso_frame_desc; 292 293 for (; s->sync_packet < 0; ++p, ++s->sync_packet) { 294 struct urb *ii = sk->completed_inurb; 295 296 id = ii->iso_frame_desc + 297 ii->number_of_packets + s->sync_packet; 298 l = id->actual_length; 299 300 od[p].length = l; 301 od[p].offset = lb; 302 lb += l; 303 } 304 305 for (; 306 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; 307 ++p, ++s->sync_packet) { 308 l = inurb->iso_frame_desc[s->sync_packet].actual_length; 309 310 if (s->idle_outsize + lb + l > s->period_size) 311 goto check_ok; 312 313 od[p].length = l; 314 od[p].offset = lb; 315 lb += l; 316 } 317 318check_ok: 319 s->sync_packet -= inurb->number_of_packets; 320 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) { 321 snd_printk(KERN_WARNING "invalid sync_packet = %i;" 322 " p=%i nop=%i %i %x %x %x > %x\n", 323 s->sync_packet, p, inurb->number_of_packets, 324 s->idle_outsize + lb + l, 325 s->idle_outsize, lb, l, 326 s->period_size); 327 return -1; 328 } 329 if (unlikely(lb % s->cfg.frame_size)) { 330 snd_printk(KERN_WARNING"invalid outsize = %i\n", 331 lb); 332 return -1; 333 } 334 s->idle_outsize += lb - s->period_size; 335 io->number_of_packets = p; 336 io->transfer_buffer_length = lb; 337 if (s->idle_outsize <= 0) 338 return 0; 339 340 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); 341 return -1; 342} 343 344static void prepare_inurb(int number_of_packets, struct urb *iu) 345{ 346 struct usb_iso_packet_descriptor *id; 347 int p; 348 349 iu->number_of_packets = number_of_packets; 350 id = iu->iso_frame_desc; 351 id->offset = 0; 352 for (p = 0; p < iu->number_of_packets - 1; ++p) 353 id[p + 1].offset = id[p].offset + id[p].length; 354 355 iu->transfer_buffer_length = 356 id[0].length * iu->number_of_packets; 357} 358 359static int submit_urbs(struct usb_stream_kernel *sk, 360 struct urb *inurb, struct urb *outurb) 361{ 362 int err; 363 364 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); 365 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); 366 if (err < 0) 367 goto report_failure; 368 369 sk->idle_inurb = sk->completed_inurb; 370 sk->completed_inurb = inurb; 371 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); 372 if (err < 0) 373 goto report_failure; 374 375 sk->idle_outurb = sk->completed_outurb; 376 sk->completed_outurb = outurb; 377 return 0; 378 379report_failure: 380 snd_printk(KERN_ERR "%i\n", err); 381 return err; 382} 383 384#ifdef DEBUG_LOOP_BACK 385/* 386 This loop_back() shows how to read/write the period data. 387 */ 388static void loop_back(struct usb_stream *s) 389{ 390 char *i, *o; 391 int il, ol, l, p; 392 struct urb *iu; 393 struct usb_iso_packet_descriptor *id; 394 395 o = s->playback1st_to; 396 ol = s->playback1st_size; 397 l = 0; 398 399 if (s->insplit_pack >= 0) { 400 iu = sk->idle_inurb; 401 id = iu->iso_frame_desc; 402 p = s->insplit_pack; 403 } else 404 goto second; 405loop: 406 for (; p < iu->number_of_packets && l < s->period_size; ++p) { 407 i = iu->transfer_buffer + id[p].offset; 408 il = id[p].actual_length; 409 if (l + il > s->period_size) 410 il = s->period_size - l; 411 if (il <= ol) { 412 memcpy(o, i, il); 413 o += il; 414 ol -= il; 415 } else { 416 memcpy(o, i, ol); 417 singen_6pack(o, ol); 418 o = s->playback_to; 419 memcpy(o, i + ol, il - ol); 420 o += il - ol; 421 ol = s->period_size - s->playback1st_size; 422 } 423 l += il; 424 } 425 if (iu == sk->completed_inurb) { 426 if (l != s->period_size) 427 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, 428 l/(int)s->cfg.frame_size); 429 430 return; 431 } 432second: 433 iu = sk->completed_inurb; 434 id = iu->iso_frame_desc; 435 p = 0; 436 goto loop; 437 438} 439#else 440static void loop_back(struct usb_stream *s) 441{ 442} 443#endif 444 445static void stream_idle(struct usb_stream_kernel *sk, 446 struct urb *inurb, struct urb *outurb) 447{ 448 struct usb_stream *s = sk->s; 449 int l, p; 450 int insize = s->idle_insize; 451 int urb_size = 0; 452 453 s->inpacket_split = s->next_inpacket_split; 454 s->inpacket_split_at = s->next_inpacket_split_at; 455 s->next_inpacket_split = -1; 456 s->next_inpacket_split_at = 0; 457 458 for (p = 0; p < inurb->number_of_packets; ++p) { 459 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; 460 461 l = id[p].actual_length; 462 if (unlikely(l == 0 || id[p].status)) { 463 snd_printk(KERN_WARNING "underrun, status=%u\n", 464 id[p].status); 465 goto err_out; 466 } 467 s->inpacket_head++; 468 s->inpacket_head %= s->inpackets; 469 if (s->inpacket_split == -1) 470 s->inpacket_split = s->inpacket_head; 471 472 s->inpacket[s->inpacket_head].offset = 473 id[p].offset + (inurb->transfer_buffer - (void *)s); 474 s->inpacket[s->inpacket_head].length = l; 475 if (insize + l > s->period_size && 476 s->next_inpacket_split == -1) { 477 s->next_inpacket_split = s->inpacket_head; 478 s->next_inpacket_split_at = s->period_size - insize; 479 } 480 insize += l; 481 urb_size += l; 482 } 483 s->idle_insize += urb_size - s->period_size; 484 if (s->idle_insize < 0) { 485 snd_printk(KERN_WARNING "%i\n", 486 (s->idle_insize)/(int)s->cfg.frame_size); 487 goto err_out; 488 } 489 s->insize_done += urb_size; 490 491 l = s->idle_outsize; 492 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - 493 sk->write_page) - l; 494 495 if (usb_stream_prepare_playback(sk, inurb) < 0) 496 goto err_out; 497 498 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; 499 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - 500 sk->write_page; 501 502 if (submit_urbs(sk, inurb, outurb) < 0) 503 goto err_out; 504 505 loop_back(s); 506 s->periods_done++; 507 wake_up_all(&sk->sleep); 508 return; 509err_out: 510 s->state = usb_stream_xrun; 511 wake_up_all(&sk->sleep); 512} 513 514static void i_capture_idle(struct urb *urb) 515{ 516 struct usb_stream_kernel *sk = urb->context; 517 518 if (balance_capture(sk, urb)) 519 stream_idle(sk, urb, sk->i_urb); 520} 521 522static void i_playback_idle(struct urb *urb) 523{ 524 struct usb_stream_kernel *sk = urb->context; 525 526 if (balance_playback(sk, urb)) 527 stream_idle(sk, sk->i_urb, urb); 528} 529 530static void stream_start(struct usb_stream_kernel *sk, 531 struct urb *inurb, struct urb *outurb) 532{ 533 struct usb_stream *s = sk->s; 534 535 if (s->state >= usb_stream_sync1) { 536 int l, p, max_diff, max_diff_0; 537 int urb_size = 0; 538 unsigned int frames_per_packet, min_frames = 0; 539 540 frames_per_packet = (s->period_size - s->idle_insize); 541 frames_per_packet <<= 8; 542 frames_per_packet /= 543 s->cfg.frame_size * inurb->number_of_packets; 544 frames_per_packet++; 545 546 max_diff_0 = s->cfg.frame_size; 547 if (s->cfg.period_frames >= 256) 548 max_diff_0 <<= 1; 549 if (s->cfg.period_frames >= 1024) 550 max_diff_0 <<= 1; 551 max_diff = max_diff_0; 552 for (p = 0; p < inurb->number_of_packets; ++p) { 553 int diff; 554 555 l = inurb->iso_frame_desc[p].actual_length; 556 urb_size += l; 557 558 min_frames += frames_per_packet; 559 diff = urb_size - 560 (min_frames >> 8) * s->cfg.frame_size; 561 if (diff < max_diff) { 562 snd_printdd(KERN_DEBUG "%i %i %i %i\n", 563 s->insize_done, 564 urb_size / (int)s->cfg.frame_size, 565 inurb->number_of_packets, diff); 566 max_diff = diff; 567 } 568 } 569 s->idle_insize -= max_diff - max_diff_0; 570 s->idle_insize += urb_size - s->period_size; 571 if (s->idle_insize < 0) { 572 snd_printk(KERN_WARNING "%i %i %i\n", 573 s->idle_insize, urb_size, s->period_size); 574 return; 575 } else if (s->idle_insize == 0) { 576 s->next_inpacket_split = 577 (s->inpacket_head + 1) % s->inpackets; 578 s->next_inpacket_split_at = 0; 579 } else { 580 unsigned int split = s->inpacket_head; 581 582 l = s->idle_insize; 583 while (l > s->inpacket[split].length) { 584 l -= s->inpacket[split].length; 585 if (split == 0) 586 split = s->inpackets - 1; 587 else 588 split--; 589 } 590 s->next_inpacket_split = split; 591 s->next_inpacket_split_at = 592 s->inpacket[split].length - l; 593 } 594 595 s->insize_done += urb_size; 596 597 if (usb_stream_prepare_playback(sk, inurb) < 0) 598 return; 599 600 } else 601 playback_prep_freqn(sk, sk->idle_outurb); 602 603 if (submit_urbs(sk, inurb, outurb) < 0) 604 return; 605 606 if (s->state == usb_stream_sync1 && s->insize_done > 360000) { 607 /* just guesswork ^^^^^^ */ 608 s->state = usb_stream_ready; 609 subs_set_complete(sk->inurb, i_capture_idle); 610 subs_set_complete(sk->outurb, i_playback_idle); 611 } 612} 613 614static void i_capture_start(struct urb *urb) 615{ 616 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; 617 struct usb_stream_kernel *sk = urb->context; 618 struct usb_stream *s = sk->s; 619 int p; 620 int empty = 0; 621 622 if (urb->status) { 623 snd_printk(KERN_WARNING "status=%i\n", urb->status); 624 return; 625 } 626 627 for (p = 0; p < urb->number_of_packets; ++p) { 628 int l = id[p].actual_length; 629 630 if (l < s->cfg.frame_size) { 631 ++empty; 632 if (s->state >= usb_stream_sync0) { 633 snd_printk(KERN_WARNING "%i\n", l); 634 return; 635 } 636 } 637 s->inpacket_head++; 638 s->inpacket_head %= s->inpackets; 639 s->inpacket[s->inpacket_head].offset = 640 id[p].offset + (urb->transfer_buffer - (void *)s); 641 s->inpacket[s->inpacket_head].length = l; 642 } 643#ifdef SHOW_EMPTY 644 if (empty) { 645 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, 646 urb->iso_frame_desc[0].actual_length); 647 for (pack = 1; pack < urb->number_of_packets; ++pack) { 648 int l = urb->iso_frame_desc[pack].actual_length; 649 650 printk(KERN_CONT " %i", l); 651 } 652 printk(KERN_CONT "\n"); 653 } 654#endif 655 if (!empty && s->state < usb_stream_sync1) 656 ++s->state; 657 658 if (balance_capture(sk, urb)) 659 stream_start(sk, urb, sk->i_urb); 660} 661 662static void i_playback_start(struct urb *urb) 663{ 664 struct usb_stream_kernel *sk = urb->context; 665 666 if (balance_playback(sk, urb)) 667 stream_start(sk, sk->i_urb, urb); 668} 669 670int usb_stream_start(struct usb_stream_kernel *sk) 671{ 672 struct usb_stream *s = sk->s; 673 int frame = 0, iters = 0; 674 int u, err; 675 int try = 0; 676 677 if (s->state != usb_stream_stopped) 678 return -EAGAIN; 679 680 subs_set_complete(sk->inurb, i_capture_start); 681 subs_set_complete(sk->outurb, i_playback_start); 682 memset(sk->write_page, 0, s->write_size); 683dotry: 684 s->insize_done = 0; 685 s->idle_insize = 0; 686 s->idle_outsize = 0; 687 s->sync_packet = -1; 688 s->inpacket_head = -1; 689 sk->iso_frame_balance = 0; 690 ++try; 691 for (u = 0; u < 2; u++) { 692 struct urb *inurb = sk->inurb[u]; 693 struct urb *outurb = sk->outurb[u]; 694 695 playback_prep_freqn(sk, outurb); 696 inurb->number_of_packets = outurb->number_of_packets; 697 inurb->transfer_buffer_length = 698 inurb->number_of_packets * 699 inurb->iso_frame_desc[0].length; 700 701 if (u == 0) { 702 int now; 703 struct usb_device *dev = inurb->dev; 704 705 frame = usb_get_current_frame_number(dev); 706 do { 707 now = usb_get_current_frame_number(dev); 708 ++iters; 709 } while (now > -1 && now == frame); 710 } 711 err = usb_submit_urb(inurb, GFP_ATOMIC); 712 if (err < 0) { 713 snd_printk(KERN_ERR 714 "usb_submit_urb(sk->inurb[%i]) returned %i\n", 715 u, err); 716 return err; 717 } 718 err = usb_submit_urb(outurb, GFP_ATOMIC); 719 if (err < 0) { 720 snd_printk(KERN_ERR 721 "usb_submit_urb(sk->outurb[%i]) returned %i\n", 722 u, err); 723 return err; 724 } 725 726 if (inurb->start_frame != outurb->start_frame) { 727 snd_printd(KERN_DEBUG 728 "u[%i] start_frames differ in:%u out:%u\n", 729 u, inurb->start_frame, outurb->start_frame); 730 goto check_retry; 731 } 732 } 733 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); 734 try = 0; 735check_retry: 736 if (try) { 737 usb_stream_stop(sk); 738 if (try < 5) { 739 msleep(1500); 740 snd_printd(KERN_DEBUG "goto dotry;\n"); 741 goto dotry; 742 } 743 snd_printk(KERN_WARNING 744 "couldn't start all urbs on the same start_frame.\n"); 745 return -EFAULT; 746 } 747 748 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; 749 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; 750 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; 751 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; 752 753/* wait, check */ 754 { 755 int wait_ms = 3000; 756 757 while (s->state != usb_stream_ready && wait_ms > 0) { 758 snd_printdd(KERN_DEBUG "%i\n", s->state); 759 msleep(200); 760 wait_ms -= 200; 761 } 762 } 763 764 return s->state == usb_stream_ready ? 0 : -EFAULT; 765} 766 767 768/* stop */ 769 770void usb_stream_stop(struct usb_stream_kernel *sk) 771{ 772 int u; 773 774 if (!sk->s) 775 return; 776 for (u = 0; u < USB_STREAM_NURBS; ++u) { 777 usb_kill_urb(sk->inurb[u]); 778 usb_kill_urb(sk->outurb[u]); 779 } 780 sk->s->state = usb_stream_stopped; 781 msleep(400); 782} 783