1 /* 2 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de> 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the 6 * Free Software Foundation; either version 2 of the License, or (at your 7 * option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software Foundation, 16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 #include <linux/usb.h> 20 #include <linux/gfp.h> 21 22 #include "usb_stream.h" 23 24 25 /* setup */ 26 27 static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk) 28 { 29 struct usb_stream *s = sk->s; 30 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; 31 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; 32 } 33 34 static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) 35 { 36 struct usb_stream *s = sk->s; 37 int pack, lb = 0; 38 39 for (pack = 0; pack < sk->n_o_ps; pack++) { 40 int l = usb_stream_next_packet_size(sk); 41 if (s->idle_outsize + lb + l > s->period_size) 42 goto check; 43 44 sk->out_phase = sk->out_phase_peeked; 45 urb->iso_frame_desc[pack].offset = lb; 46 urb->iso_frame_desc[pack].length = l; 47 lb += l; 48 } 49 snd_printdd(KERN_DEBUG "%i\n", lb); 50 51 check: 52 urb->number_of_packets = pack; 53 urb->transfer_buffer_length = lb; 54 s->idle_outsize += lb - s->period_size; 55 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, 56 lb, s->period_size); 57 } 58 59 static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, 60 struct urb **urbs, char *transfer, 61 struct usb_device *dev, int pipe) 62 { 63 int u, p; 64 int maxpacket = use_packsize ? 65 use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe)); 66 int transfer_length = maxpacket * sk->n_o_ps; 67 68 for (u = 0; u < USB_STREAM_NURBS; 69 ++u, transfer += transfer_length) { 70 struct urb *urb = urbs[u]; 71 struct usb_iso_packet_descriptor *desc; 72 urb->transfer_flags = URB_ISO_ASAP; 73 urb->transfer_buffer = transfer; 74 urb->dev = dev; 75 urb->pipe = pipe; 76 urb->number_of_packets = sk->n_o_ps; 77 urb->context = sk; 78 urb->interval = 1; 79 if (usb_pipeout(pipe)) 80 continue; 81 82 urb->transfer_buffer_length = transfer_length; 83 desc = urb->iso_frame_desc; 84 desc->offset = 0; 85 desc->length = maxpacket; 86 for (p = 1; p < sk->n_o_ps; ++p) { 87 desc[p].offset = desc[p - 1].offset + maxpacket; 88 desc[p].length = maxpacket; 89 } 90 } 91 } 92 93 static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, 94 struct usb_device *dev, int in_pipe, int out_pipe) 95 { 96 struct usb_stream *s = sk->s; 97 char *indata = (char *)s + sizeof(*s) + 98 sizeof(struct usb_stream_packet) * 99 s->inpackets; 100 int u; 101 102 for (u = 0; u < USB_STREAM_NURBS; ++u) { 103 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 104 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 105 } 106 107 init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe); 108 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, 109 out_pipe); 110 } 111 112 113 /* 114 * convert a sampling rate into our full speed format (fs/1000 in Q16.16) 115 * this will overflow at approx 524 kHz 116 */ 117 static inline unsigned get_usb_full_speed_rate(unsigned rate) 118 { 119 return ((rate << 13) + 62) / 125; 120 } 121 122 /* 123 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) 124 * this will overflow at approx 4 MHz 125 */ 126 static inline unsigned get_usb_high_speed_rate(unsigned rate) 127 { 128 return ((rate << 10) + 62) / 125; 129 } 130 131 void usb_stream_free(struct usb_stream_kernel *sk) 132 { 133 struct usb_stream *s; 134 unsigned u; 135 136 for (u = 0; u < USB_STREAM_NURBS; ++u) { 137 usb_free_urb(sk->inurb[u]); 138 sk->inurb[u] = NULL; 139 usb_free_urb(sk->outurb[u]); 140 sk->outurb[u] = NULL; 141 } 142 143 s = sk->s; 144 if (!s) 145 return; 146 147 free_pages((unsigned long)sk->write_page, get_order(s->write_size)); 148 sk->write_page = NULL; 149 free_pages((unsigned long)s, get_order(s->read_size)); 150 sk->s = NULL; 151 } 152 153 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, 154 struct usb_device *dev, 155 unsigned in_endpoint, unsigned out_endpoint, 156 unsigned sample_rate, unsigned use_packsize, 157 unsigned period_frames, unsigned frame_size) 158 { 159 int packets, max_packsize; 160 int in_pipe, out_pipe; 161 int read_size = sizeof(struct usb_stream); 162 int write_size; 163 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; 164 int pg; 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 pg = get_order(read_size); 195 sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); 196 if (!sk->s) { 197 snd_printk(KERN_WARNING "couldn't __get_free_pages()\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 pg = get_order(write_size); 213 214 sk->write_page = 215 (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); 216 if (!sk->write_page) { 217 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); 218 usb_stream_free(sk); 219 return NULL; 220 } 221 222 /* calculate the frequency in 16.16 format */ 223 if (dev->speed == USB_SPEED_FULL) 224 sk->freqn = get_usb_full_speed_rate(sample_rate); 225 else 226 sk->freqn = get_usb_high_speed_rate(sample_rate); 227 228 init_urbs(sk, use_packsize, dev, in_pipe, out_pipe); 229 sk->s->state = usb_stream_stopped; 230 out: 231 return sk->s; 232 } 233 234 235 /* start */ 236 237 static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) 238 { 239 bool r; 240 if (unlikely(urb->status)) { 241 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) 242 snd_printk(KERN_WARNING "status=%i\n", urb->status); 243 sk->iso_frame_balance = 0x7FFFFFFF; 244 return false; 245 } 246 r = sk->iso_frame_balance == 0; 247 if (!r) 248 sk->i_urb = urb; 249 return r; 250 } 251 252 static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) 253 { 254 sk->iso_frame_balance += urb->number_of_packets; 255 return balance_check(sk, urb); 256 } 257 258 static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) 259 { 260 sk->iso_frame_balance -= urb->number_of_packets; 261 return balance_check(sk, urb); 262 } 263 264 static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) 265 { 266 int u; 267 268 for (u = 0; u < USB_STREAM_NURBS; u++) { 269 struct urb *urb = urbs[u]; 270 urb->complete = complete; 271 } 272 } 273 274 static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, 275 struct urb *inurb) 276 { 277 struct usb_stream *s = sk->s; 278 struct urb *io; 279 struct usb_iso_packet_descriptor *id, *od; 280 int p = 0, lb = 0, l = 0; 281 282 io = sk->idle_outurb; 283 od = io->iso_frame_desc; 284 285 for (; s->sync_packet < 0; ++p, ++s->sync_packet) { 286 struct urb *ii = sk->completed_inurb; 287 id = ii->iso_frame_desc + 288 ii->number_of_packets + s->sync_packet; 289 l = id->actual_length; 290 291 od[p].length = l; 292 od[p].offset = lb; 293 lb += l; 294 } 295 296 for (; 297 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; 298 ++p, ++s->sync_packet) { 299 l = inurb->iso_frame_desc[s->sync_packet].actual_length; 300 301 if (s->idle_outsize + lb + l > s->period_size) 302 goto check_ok; 303 304 od[p].length = l; 305 od[p].offset = lb; 306 lb += l; 307 } 308 309 check_ok: 310 s->sync_packet -= inurb->number_of_packets; 311 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) { 312 snd_printk(KERN_WARNING "invalid sync_packet = %i;" 313 " p=%i nop=%i %i %x %x %x > %x\n", 314 s->sync_packet, p, inurb->number_of_packets, 315 s->idle_outsize + lb + l, 316 s->idle_outsize, lb, l, 317 s->period_size); 318 return -1; 319 } 320 if (unlikely(lb % s->cfg.frame_size)) { 321 snd_printk(KERN_WARNING"invalid outsize = %i\n", 322 lb); 323 return -1; 324 } 325 s->idle_outsize += lb - s->period_size; 326 io->number_of_packets = p; 327 io->transfer_buffer_length = lb; 328 if (s->idle_outsize <= 0) 329 return 0; 330 331 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); 332 return -1; 333 } 334 335 static void prepare_inurb(int number_of_packets, struct urb *iu) 336 { 337 struct usb_iso_packet_descriptor *id; 338 int p; 339 340 iu->number_of_packets = number_of_packets; 341 id = iu->iso_frame_desc; 342 id->offset = 0; 343 for (p = 0; p < iu->number_of_packets - 1; ++p) 344 id[p + 1].offset = id[p].offset + id[p].length; 345 346 iu->transfer_buffer_length = 347 id[0].length * iu->number_of_packets; 348 } 349 350 static int submit_urbs(struct usb_stream_kernel *sk, 351 struct urb *inurb, struct urb *outurb) 352 { 353 int err; 354 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); 355 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); 356 if (err < 0) { 357 snd_printk(KERN_ERR "%i\n", err); 358 return err; 359 } 360 sk->idle_inurb = sk->completed_inurb; 361 sk->completed_inurb = inurb; 362 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); 363 if (err < 0) { 364 snd_printk(KERN_ERR "%i\n", err); 365 return err; 366 } 367 sk->idle_outurb = sk->completed_outurb; 368 sk->completed_outurb = outurb; 369 return 0; 370 } 371 372 #ifdef DEBUG_LOOP_BACK 373 /* 374 This loop_back() shows how to read/write the period data. 375 */ 376 static void loop_back(struct usb_stream *s) 377 { 378 char *i, *o; 379 int il, ol, l, p; 380 struct urb *iu; 381 struct usb_iso_packet_descriptor *id; 382 383 o = s->playback1st_to; 384 ol = s->playback1st_size; 385 l = 0; 386 387 if (s->insplit_pack >= 0) { 388 iu = sk->idle_inurb; 389 id = iu->iso_frame_desc; 390 p = s->insplit_pack; 391 } else 392 goto second; 393 loop: 394 for (; p < iu->number_of_packets && l < s->period_size; ++p) { 395 i = iu->transfer_buffer + id[p].offset; 396 il = id[p].actual_length; 397 if (l + il > s->period_size) 398 il = s->period_size - l; 399 if (il <= ol) { 400 memcpy(o, i, il); 401 o += il; 402 ol -= il; 403 } else { 404 memcpy(o, i, ol); 405 singen_6pack(o, ol); 406 o = s->playback_to; 407 memcpy(o, i + ol, il - ol); 408 o += il - ol; 409 ol = s->period_size - s->playback1st_size; 410 } 411 l += il; 412 } 413 if (iu == sk->completed_inurb) { 414 if (l != s->period_size) 415 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, 416 l/(int)s->cfg.frame_size); 417 418 return; 419 } 420 second: 421 iu = sk->completed_inurb; 422 id = iu->iso_frame_desc; 423 p = 0; 424 goto loop; 425 426 } 427 #else 428 static void loop_back(struct usb_stream *s) 429 { 430 } 431 #endif 432 433 static void stream_idle(struct usb_stream_kernel *sk, 434 struct urb *inurb, struct urb *outurb) 435 { 436 struct usb_stream *s = sk->s; 437 int l, p; 438 int insize = s->idle_insize; 439 int urb_size = 0; 440 441 s->inpacket_split = s->next_inpacket_split; 442 s->inpacket_split_at = s->next_inpacket_split_at; 443 s->next_inpacket_split = -1; 444 s->next_inpacket_split_at = 0; 445 446 for (p = 0; p < inurb->number_of_packets; ++p) { 447 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; 448 l = id[p].actual_length; 449 if (unlikely(l == 0 || id[p].status)) { 450 snd_printk(KERN_WARNING "underrun, status=%u\n", 451 id[p].status); 452 goto err_out; 453 } 454 s->inpacket_head++; 455 s->inpacket_head %= s->inpackets; 456 if (s->inpacket_split == -1) 457 s->inpacket_split = s->inpacket_head; 458 459 s->inpacket[s->inpacket_head].offset = 460 id[p].offset + (inurb->transfer_buffer - (void *)s); 461 s->inpacket[s->inpacket_head].length = l; 462 if (insize + l > s->period_size && 463 s->next_inpacket_split == -1) { 464 s->next_inpacket_split = s->inpacket_head; 465 s->next_inpacket_split_at = s->period_size - insize; 466 } 467 insize += l; 468 urb_size += l; 469 } 470 s->idle_insize += urb_size - s->period_size; 471 if (s->idle_insize < 0) { 472 snd_printk(KERN_WARNING "%i\n", 473 (s->idle_insize)/(int)s->cfg.frame_size); 474 goto err_out; 475 } 476 s->insize_done += urb_size; 477 478 l = s->idle_outsize; 479 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - 480 sk->write_page) - l; 481 482 if (usb_stream_prepare_playback(sk, inurb) < 0) 483 goto err_out; 484 485 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; 486 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - 487 sk->write_page; 488 489 if (submit_urbs(sk, inurb, outurb) < 0) 490 goto err_out; 491 492 loop_back(s); 493 s->periods_done++; 494 wake_up_all(&sk->sleep); 495 return; 496 err_out: 497 s->state = usb_stream_xrun; 498 wake_up_all(&sk->sleep); 499 } 500 501 static void i_capture_idle(struct urb *urb) 502 { 503 struct usb_stream_kernel *sk = urb->context; 504 if (balance_capture(sk, urb)) 505 stream_idle(sk, urb, sk->i_urb); 506 } 507 508 static void i_playback_idle(struct urb *urb) 509 { 510 struct usb_stream_kernel *sk = urb->context; 511 if (balance_playback(sk, urb)) 512 stream_idle(sk, sk->i_urb, urb); 513 } 514 515 static void stream_start(struct usb_stream_kernel *sk, 516 struct urb *inurb, struct urb *outurb) 517 { 518 struct usb_stream *s = sk->s; 519 if (s->state >= usb_stream_sync1) { 520 int l, p, max_diff, max_diff_0; 521 int urb_size = 0; 522 unsigned frames_per_packet, min_frames = 0; 523 frames_per_packet = (s->period_size - s->idle_insize); 524 frames_per_packet <<= 8; 525 frames_per_packet /= 526 s->cfg.frame_size * inurb->number_of_packets; 527 frames_per_packet++; 528 529 max_diff_0 = s->cfg.frame_size; 530 if (s->cfg.period_frames >= 256) 531 max_diff_0 <<= 1; 532 if (s->cfg.period_frames >= 1024) 533 max_diff_0 <<= 1; 534 max_diff = max_diff_0; 535 for (p = 0; p < inurb->number_of_packets; ++p) { 536 int diff; 537 l = inurb->iso_frame_desc[p].actual_length; 538 urb_size += l; 539 540 min_frames += frames_per_packet; 541 diff = urb_size - 542 (min_frames >> 8) * s->cfg.frame_size; 543 if (diff < max_diff) { 544 snd_printdd(KERN_DEBUG "%i %i %i %i\n", 545 s->insize_done, 546 urb_size / (int)s->cfg.frame_size, 547 inurb->number_of_packets, diff); 548 max_diff = diff; 549 } 550 } 551 s->idle_insize -= max_diff - max_diff_0; 552 s->idle_insize += urb_size - s->period_size; 553 if (s->idle_insize < 0) { 554 snd_printk(KERN_WARNING "%i %i %i\n", 555 s->idle_insize, urb_size, s->period_size); 556 return; 557 } else if (s->idle_insize == 0) { 558 s->next_inpacket_split = 559 (s->inpacket_head + 1) % s->inpackets; 560 s->next_inpacket_split_at = 0; 561 } else { 562 unsigned split = s->inpacket_head; 563 l = s->idle_insize; 564 while (l > s->inpacket[split].length) { 565 l -= s->inpacket[split].length; 566 if (split == 0) 567 split = s->inpackets - 1; 568 else 569 split--; 570 } 571 s->next_inpacket_split = split; 572 s->next_inpacket_split_at = 573 s->inpacket[split].length - l; 574 } 575 576 s->insize_done += urb_size; 577 578 if (usb_stream_prepare_playback(sk, inurb) < 0) 579 return; 580 581 } else 582 playback_prep_freqn(sk, sk->idle_outurb); 583 584 if (submit_urbs(sk, inurb, outurb) < 0) 585 return; 586 587 if (s->state == usb_stream_sync1 && s->insize_done > 360000) { 588 /* just guesswork ^^^^^^ */ 589 s->state = usb_stream_ready; 590 subs_set_complete(sk->inurb, i_capture_idle); 591 subs_set_complete(sk->outurb, i_playback_idle); 592 } 593 } 594 595 static void i_capture_start(struct urb *urb) 596 { 597 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; 598 struct usb_stream_kernel *sk = urb->context; 599 struct usb_stream *s = sk->s; 600 int p; 601 int empty = 0; 602 603 if (urb->status) { 604 snd_printk(KERN_WARNING "status=%i\n", urb->status); 605 return; 606 } 607 608 for (p = 0; p < urb->number_of_packets; ++p) { 609 int l = id[p].actual_length; 610 if (l < s->cfg.frame_size) { 611 ++empty; 612 if (s->state >= usb_stream_sync0) { 613 snd_printk(KERN_WARNING "%i\n", l); 614 return; 615 } 616 } 617 s->inpacket_head++; 618 s->inpacket_head %= s->inpackets; 619 s->inpacket[s->inpacket_head].offset = 620 id[p].offset + (urb->transfer_buffer - (void *)s); 621 s->inpacket[s->inpacket_head].length = l; 622 } 623 #ifdef SHOW_EMPTY 624 if (empty) { 625 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, 626 urb->iso_frame_desc[0].actual_length); 627 for (pack = 1; pack < urb->number_of_packets; ++pack) { 628 int l = urb->iso_frame_desc[pack].actual_length; 629 printk(" %i", l); 630 } 631 printk("\n"); 632 } 633 #endif 634 if (!empty && s->state < usb_stream_sync1) 635 ++s->state; 636 637 if (balance_capture(sk, urb)) 638 stream_start(sk, urb, sk->i_urb); 639 } 640 641 static void i_playback_start(struct urb *urb) 642 { 643 struct usb_stream_kernel *sk = urb->context; 644 if (balance_playback(sk, urb)) 645 stream_start(sk, sk->i_urb, urb); 646 } 647 648 int usb_stream_start(struct usb_stream_kernel *sk) 649 { 650 struct usb_stream *s = sk->s; 651 int frame = 0, iters = 0; 652 int u, err; 653 int try = 0; 654 655 if (s->state != usb_stream_stopped) 656 return -EAGAIN; 657 658 subs_set_complete(sk->inurb, i_capture_start); 659 subs_set_complete(sk->outurb, i_playback_start); 660 memset(sk->write_page, 0, s->write_size); 661 dotry: 662 s->insize_done = 0; 663 s->idle_insize = 0; 664 s->idle_outsize = 0; 665 s->sync_packet = -1; 666 s->inpacket_head = -1; 667 sk->iso_frame_balance = 0; 668 ++try; 669 for (u = 0; u < 2; u++) { 670 struct urb *inurb = sk->inurb[u]; 671 struct urb *outurb = sk->outurb[u]; 672 playback_prep_freqn(sk, outurb); 673 inurb->number_of_packets = outurb->number_of_packets; 674 inurb->transfer_buffer_length = 675 inurb->number_of_packets * 676 inurb->iso_frame_desc[0].length; 677 678 if (u == 0) { 679 int now; 680 struct usb_device *dev = inurb->dev; 681 frame = usb_get_current_frame_number(dev); 682 do { 683 now = usb_get_current_frame_number(dev); 684 ++iters; 685 } while (now > -1 && now == frame); 686 } 687 err = usb_submit_urb(inurb, GFP_ATOMIC); 688 if (err < 0) { 689 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" 690 " returned %i\n", u, err); 691 return err; 692 } 693 err = usb_submit_urb(outurb, GFP_ATOMIC); 694 if (err < 0) { 695 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" 696 " returned %i\n", u, err); 697 return err; 698 } 699 700 if (inurb->start_frame != outurb->start_frame) { 701 snd_printd(KERN_DEBUG 702 "u[%i] start_frames differ in:%u out:%u\n", 703 u, inurb->start_frame, outurb->start_frame); 704 goto check_retry; 705 } 706 } 707 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); 708 try = 0; 709 check_retry: 710 if (try) { 711 usb_stream_stop(sk); 712 if (try < 5) { 713 msleep(1500); 714 snd_printd(KERN_DEBUG "goto dotry;\n"); 715 goto dotry; 716 } 717 snd_printk(KERN_WARNING"couldn't start" 718 " all urbs on the same start_frame.\n"); 719 return -EFAULT; 720 } 721 722 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; 723 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; 724 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; 725 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; 726 727 /* wait, check */ 728 { 729 int wait_ms = 3000; 730 while (s->state != usb_stream_ready && wait_ms > 0) { 731 snd_printdd(KERN_DEBUG "%i\n", s->state); 732 msleep(200); 733 wait_ms -= 200; 734 } 735 } 736 737 return s->state == usb_stream_ready ? 0 : -EFAULT; 738 } 739 740 741 /* stop */ 742 743 void usb_stream_stop(struct usb_stream_kernel *sk) 744 { 745 int u; 746 if (!sk->s) 747 return; 748 for (u = 0; u < USB_STREAM_NURBS; ++u) { 749 usb_kill_urb(sk->inurb[u]); 750 usb_kill_urb(sk->outurb[u]); 751 } 752 sk->s->state = usb_stream_stopped; 753 msleep(400); 754 } 755