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