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