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