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