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 21 #include "usb_stream.h" 22 23 24 /* setup */ 25 26 static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk) 27 { 28 struct usb_stream *s = sk->s; 29 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; 30 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; 31 } 32 33 static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) 34 { 35 struct usb_stream *s = sk->s; 36 unsigned l = 0; 37 int pack; 38 39 urb->iso_frame_desc[0].offset = 0; 40 urb->iso_frame_desc[0].length = usb_stream_next_packet_size(sk); 41 sk->out_phase = sk->out_phase_peeked; 42 urb->transfer_buffer_length = urb->iso_frame_desc[0].length; 43 44 for (pack = 1; pack < sk->n_o_ps; pack++) { 45 l = usb_stream_next_packet_size(sk); 46 if (s->idle_outsize + urb->transfer_buffer_length + l > 47 s->period_size) 48 goto check; 49 50 sk->out_phase = sk->out_phase_peeked; 51 urb->iso_frame_desc[pack].offset = urb->transfer_buffer_length; 52 urb->iso_frame_desc[pack].length = l; 53 urb->transfer_buffer_length += l; 54 } 55 snd_printdd(KERN_DEBUG "%i\n", urb->transfer_buffer_length); 56 57 check: 58 urb->number_of_packets = pack; 59 s->idle_outsize += urb->transfer_buffer_length - s->period_size; 60 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, 61 urb->transfer_buffer_length, s->period_size); 62 } 63 64 static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, 65 struct urb **urbs, char *transfer, 66 struct usb_device *dev, int pipe) 67 { 68 int u, p; 69 int maxpacket = use_packsize ? 70 use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe)); 71 int transfer_length = maxpacket * sk->n_o_ps; 72 73 for (u = 0; u < USB_STREAM_NURBS; 74 ++u, transfer += transfer_length) { 75 struct urb *urb = urbs[u]; 76 struct usb_iso_packet_descriptor *desc; 77 urb->transfer_flags = URB_ISO_ASAP; 78 urb->transfer_buffer = transfer; 79 urb->dev = dev; 80 urb->pipe = pipe; 81 urb->number_of_packets = sk->n_o_ps; 82 urb->context = sk; 83 urb->interval = 1; 84 if (usb_pipeout(pipe)) 85 continue; 86 87 urb->transfer_buffer_length = transfer_length; 88 desc = urb->iso_frame_desc; 89 desc->offset = 0; 90 desc->length = maxpacket; 91 for (p = 1; p < sk->n_o_ps; ++p) { 92 desc[p].offset = desc[p - 1].offset + maxpacket; 93 desc[p].length = maxpacket; 94 } 95 } 96 } 97 98 static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, 99 struct usb_device *dev, int in_pipe, int out_pipe) 100 { 101 struct usb_stream *s = sk->s; 102 char *indata = (char *)s + sizeof(*s) + 103 sizeof(struct usb_stream_packet) * 104 s->inpackets; 105 int u; 106 107 for (u = 0; u < USB_STREAM_NURBS; ++u) { 108 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 109 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 110 } 111 112 init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe); 113 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, 114 out_pipe); 115 } 116 117 118 /* 119 * convert a sampling rate into our full speed format (fs/1000 in Q16.16) 120 * this will overflow at approx 524 kHz 121 */ 122 static inline unsigned get_usb_full_speed_rate(unsigned rate) 123 { 124 return ((rate << 13) + 62) / 125; 125 } 126 127 /* 128 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) 129 * this will overflow at approx 4 MHz 130 */ 131 static inline unsigned get_usb_high_speed_rate(unsigned rate) 132 { 133 return ((rate << 10) + 62) / 125; 134 } 135 136 void usb_stream_free(struct usb_stream_kernel *sk) 137 { 138 struct usb_stream *s; 139 unsigned u; 140 141 for (u = 0; u < USB_STREAM_NURBS; ++u) { 142 usb_free_urb(sk->inurb[u]); 143 sk->inurb[u] = NULL; 144 usb_free_urb(sk->outurb[u]); 145 sk->outurb[u] = NULL; 146 } 147 148 s = sk->s; 149 if (!s) 150 return; 151 152 free_pages((unsigned long)sk->write_page, get_order(s->write_size)); 153 sk->write_page = NULL; 154 free_pages((unsigned long)s, get_order(s->read_size)); 155 sk->s = NULL; 156 } 157 158 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, 159 struct usb_device *dev, 160 unsigned in_endpoint, unsigned out_endpoint, 161 unsigned sample_rate, unsigned use_packsize, 162 unsigned period_frames, unsigned frame_size) 163 { 164 int packets, max_packsize; 165 int in_pipe, out_pipe; 166 int read_size = sizeof(struct usb_stream); 167 int write_size; 168 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; 169 int pg; 170 171 in_pipe = usb_rcvisocpipe(dev, in_endpoint); 172 out_pipe = usb_sndisocpipe(dev, out_endpoint); 173 174 max_packsize = use_packsize ? 175 use_packsize : usb_maxpacket(dev, in_pipe, 0); 176 177 /* 178 t_period = period_frames / sample_rate 179 iso_packs = t_period / t_iso_frame 180 = (period_frames / sample_rate) * (1 / t_iso_frame) 181 */ 182 183 packets = period_frames * usb_frames / sample_rate + 1; 184 185 if (dev->speed == USB_SPEED_HIGH) 186 packets = (packets + 7) & ~7; 187 188 read_size += packets * USB_STREAM_URBDEPTH * 189 (max_packsize + sizeof(struct usb_stream_packet)); 190 191 max_packsize = usb_maxpacket(dev, out_pipe, 1); 192 write_size = max_packsize * packets * USB_STREAM_URBDEPTH; 193 194 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { 195 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n"); 196 goto out; 197 } 198 199 pg = get_order(read_size); 200 sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); 201 if (!sk->s) { 202 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); 203 goto out; 204 } 205 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; 206 207 sk->s->read_size = read_size; 208 209 sk->s->cfg.sample_rate = sample_rate; 210 sk->s->cfg.frame_size = frame_size; 211 sk->n_o_ps = packets; 212 sk->s->inpackets = packets * USB_STREAM_URBDEPTH; 213 sk->s->cfg.period_frames = period_frames; 214 sk->s->period_size = frame_size * period_frames; 215 216 sk->s->write_size = write_size; 217 pg = get_order(write_size); 218 219 sk->write_page = 220 (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); 221 if (!sk->write_page) { 222 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); 223 usb_stream_free(sk); 224 return NULL; 225 } 226 227 /* calculate the frequency in 16.16 format */ 228 if (dev->speed == USB_SPEED_FULL) 229 sk->freqn = get_usb_full_speed_rate(sample_rate); 230 else 231 sk->freqn = get_usb_high_speed_rate(sample_rate); 232 233 init_urbs(sk, use_packsize, dev, in_pipe, out_pipe); 234 sk->s->state = usb_stream_stopped; 235 out: 236 return sk->s; 237 } 238 239 240 /* start */ 241 242 static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) 243 { 244 bool r; 245 if (unlikely(urb->status)) { 246 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) 247 snd_printk(KERN_WARNING "status=%i\n", urb->status); 248 sk->iso_frame_balance = 0x7FFFFFFF; 249 return false; 250 } 251 r = sk->iso_frame_balance == 0; 252 if (!r) 253 sk->i_urb = urb; 254 return r; 255 } 256 257 static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) 258 { 259 sk->iso_frame_balance += urb->number_of_packets; 260 return balance_check(sk, urb); 261 } 262 263 static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) 264 { 265 sk->iso_frame_balance -= urb->number_of_packets; 266 return balance_check(sk, urb); 267 } 268 269 static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) 270 { 271 int u; 272 273 for (u = 0; u < USB_STREAM_NURBS; u++) { 274 struct urb *urb = urbs[u]; 275 urb->complete = complete; 276 } 277 } 278 279 int usb_stream_prepare_playback(struct usb_stream_kernel *sk, struct urb *inurb) 280 { 281 struct usb_stream *s = sk->s; 282 struct urb *io; 283 struct usb_iso_packet_descriptor *id, *od; 284 int p, l = 0; 285 286 io = sk->idle_outurb; 287 od = io->iso_frame_desc; 288 io->transfer_buffer_length = 0; 289 290 for (p = 0; s->sync_packet < 0; ++p, ++s->sync_packet) { 291 struct urb *ii = sk->completed_inurb; 292 id = ii->iso_frame_desc + 293 ii->number_of_packets + s->sync_packet; 294 l = id->actual_length; 295 296 od[p].length = l; 297 od[p].offset = io->transfer_buffer_length; 298 io->transfer_buffer_length += l; 299 } 300 301 for (; 302 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; 303 ++p, ++s->sync_packet) { 304 l = inurb->iso_frame_desc[s->sync_packet].actual_length; 305 306 if (s->idle_outsize + io->transfer_buffer_length + l > 307 s->period_size) 308 goto check_ok; 309 310 od[p].length = l; 311 od[p].offset = io->transfer_buffer_length; 312 io->transfer_buffer_length += l; 313 } 314 315 check_ok: 316 s->sync_packet -= inurb->number_of_packets; 317 if (s->sync_packet < -2 || s->sync_packet > 0) { 318 snd_printk(KERN_WARNING "invalid sync_packet = %i;" 319 " p=%i nop=%i %i %x %x %x > %x\n", 320 s->sync_packet, p, inurb->number_of_packets, 321 s->idle_outsize + io->transfer_buffer_length + l, 322 s->idle_outsize, io->transfer_buffer_length, l, 323 s->period_size); 324 return -1; 325 } 326 if (io->transfer_buffer_length % s->cfg.frame_size) { 327 snd_printk(KERN_WARNING"invalid outsize = %i\n", 328 io->transfer_buffer_length); 329 return -1; 330 } 331 s->idle_outsize += io->transfer_buffer_length - s->period_size; 332 io->number_of_packets = p; 333 if (s->idle_outsize > 0) { 334 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); 335 return -1; 336 } 337 return 0; 338 } 339 340 static void prepare_inurb(int number_of_packets, struct urb *iu) 341 { 342 struct usb_iso_packet_descriptor *id; 343 int p; 344 345 iu->number_of_packets = number_of_packets; 346 id = iu->iso_frame_desc; 347 id->offset = 0; 348 for (p = 0; p < iu->number_of_packets - 1; ++p) 349 id[p + 1].offset = id[p].offset + id[p].length; 350 351 iu->transfer_buffer_length = 352 id[0].length * iu->number_of_packets; 353 } 354 355 static int submit_urbs(struct usb_stream_kernel *sk, 356 struct urb *inurb, struct urb *outurb) 357 { 358 int err; 359 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); 360 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); 361 if (err < 0) { 362 snd_printk(KERN_ERR "%i\n", err); 363 return err; 364 } 365 sk->idle_inurb = sk->completed_inurb; 366 sk->completed_inurb = inurb; 367 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); 368 if (err < 0) { 369 snd_printk(KERN_ERR "%i\n", err); 370 return err; 371 } 372 sk->idle_outurb = sk->completed_outurb; 373 sk->completed_outurb = outurb; 374 return 0; 375 } 376 377 #ifdef DEBUG_LOOP_BACK 378 /* 379 This loop_back() shows how to read/write the period data. 380 */ 381 static 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; 398 loop: 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 } 425 second: 426 iu = sk->completed_inurb; 427 id = iu->iso_frame_desc; 428 p = 0; 429 goto loop; 430 431 } 432 #else 433 static void loop_back(struct usb_stream *s) 434 { 435 } 436 #endif 437 438 static 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; 501 err_out: 502 s->state = usb_stream_xrun; 503 wake_up_all(&sk->sleep); 504 } 505 506 static 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 } 512 513 static 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 } 519 520 static 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("%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 } 599 600 static 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(" %i", l); 635 } 636 printk("\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 } 645 646 static 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 } 652 653 int 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); 666 dotry: 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 preempt_disable(); 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 preempt_enable(); 695 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" 696 " returned %i\n", u, err); 697 return err; 698 } 699 err = usb_submit_urb(outurb, GFP_ATOMIC); 700 if (err < 0) { 701 preempt_enable(); 702 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" 703 " returned %i\n", u, err); 704 return err; 705 } 706 preempt_enable(); 707 if (inurb->start_frame != outurb->start_frame) { 708 snd_printd(KERN_DEBUG 709 "u[%i] start_frames differ in:%u out:%u\n", 710 u, inurb->start_frame, outurb->start_frame); 711 goto check_retry; 712 } 713 } 714 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); 715 try = 0; 716 check_retry: 717 if (try) { 718 usb_stream_stop(sk); 719 if (try < 5) { 720 msleep(1500); 721 snd_printd(KERN_DEBUG "goto dotry;\n"); 722 goto dotry; 723 } 724 snd_printk(KERN_WARNING"couldn't start" 725 " all urbs on the same start_frame.\n"); 726 return -EFAULT; 727 } 728 729 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; 730 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; 731 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; 732 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; 733 734 /* wait, check */ 735 { 736 int wait_ms = 3000; 737 while (s->state != usb_stream_ready && wait_ms > 0) { 738 snd_printdd(KERN_DEBUG "%i\n", s->state); 739 msleep(200); 740 wait_ms -= 200; 741 } 742 } 743 744 return s->state == usb_stream_ready ? 0 : -EFAULT; 745 } 746 747 748 /* stop */ 749 750 void usb_stream_stop(struct usb_stream_kernel *sk) 751 { 752 int u; 753 if (!sk->s) 754 return; 755 for (u = 0; u < USB_STREAM_NURBS; ++u) { 756 usb_kill_urb(sk->inurb[u]); 757 usb_kill_urb(sk->outurb[u]); 758 } 759 sk->s->state = usb_stream_stopped; 760 msleep(400); 761 } 762