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 static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, 280 struct urb *inurb) 281 { 282 struct usb_stream *s = sk->s; 283 struct urb *io; 284 struct usb_iso_packet_descriptor *id, *od; 285 int p, l = 0; 286 287 io = sk->idle_outurb; 288 od = io->iso_frame_desc; 289 io->transfer_buffer_length = 0; 290 291 for (p = 0; s->sync_packet < 0; ++p, ++s->sync_packet) { 292 struct urb *ii = sk->completed_inurb; 293 id = ii->iso_frame_desc + 294 ii->number_of_packets + s->sync_packet; 295 l = id->actual_length; 296 297 od[p].length = l; 298 od[p].offset = io->transfer_buffer_length; 299 io->transfer_buffer_length += l; 300 } 301 302 for (; 303 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; 304 ++p, ++s->sync_packet) { 305 l = inurb->iso_frame_desc[s->sync_packet].actual_length; 306 307 if (s->idle_outsize + io->transfer_buffer_length + l > 308 s->period_size) 309 goto check_ok; 310 311 od[p].length = l; 312 od[p].offset = io->transfer_buffer_length; 313 io->transfer_buffer_length += l; 314 } 315 316 check_ok: 317 s->sync_packet -= inurb->number_of_packets; 318 if (s->sync_packet < -2 || s->sync_packet > 0) { 319 snd_printk(KERN_WARNING "invalid sync_packet = %i;" 320 " p=%i nop=%i %i %x %x %x > %x\n", 321 s->sync_packet, p, inurb->number_of_packets, 322 s->idle_outsize + io->transfer_buffer_length + l, 323 s->idle_outsize, io->transfer_buffer_length, l, 324 s->period_size); 325 return -1; 326 } 327 if (io->transfer_buffer_length % s->cfg.frame_size) { 328 snd_printk(KERN_WARNING"invalid outsize = %i\n", 329 io->transfer_buffer_length); 330 return -1; 331 } 332 s->idle_outsize += io->transfer_buffer_length - s->period_size; 333 io->number_of_packets = p; 334 if (s->idle_outsize > 0) { 335 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); 336 return -1; 337 } 338 return 0; 339 } 340 341 static void prepare_inurb(int number_of_packets, struct urb *iu) 342 { 343 struct usb_iso_packet_descriptor *id; 344 int p; 345 346 iu->number_of_packets = number_of_packets; 347 id = iu->iso_frame_desc; 348 id->offset = 0; 349 for (p = 0; p < iu->number_of_packets - 1; ++p) 350 id[p + 1].offset = id[p].offset + id[p].length; 351 352 iu->transfer_buffer_length = 353 id[0].length * iu->number_of_packets; 354 } 355 356 static int submit_urbs(struct usb_stream_kernel *sk, 357 struct urb *inurb, struct urb *outurb) 358 { 359 int err; 360 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); 361 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); 362 if (err < 0) { 363 snd_printk(KERN_ERR "%i\n", err); 364 return err; 365 } 366 sk->idle_inurb = sk->completed_inurb; 367 sk->completed_inurb = inurb; 368 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); 369 if (err < 0) { 370 snd_printk(KERN_ERR "%i\n", err); 371 return err; 372 } 373 sk->idle_outurb = sk->completed_outurb; 374 sk->completed_outurb = outurb; 375 return 0; 376 } 377 378 #ifdef DEBUG_LOOP_BACK 379 /* 380 This loop_back() shows how to read/write the period data. 381 */ 382 static void loop_back(struct usb_stream *s) 383 { 384 char *i, *o; 385 int il, ol, l, p; 386 struct urb *iu; 387 struct usb_iso_packet_descriptor *id; 388 389 o = s->playback1st_to; 390 ol = s->playback1st_size; 391 l = 0; 392 393 if (s->insplit_pack >= 0) { 394 iu = sk->idle_inurb; 395 id = iu->iso_frame_desc; 396 p = s->insplit_pack; 397 } else 398 goto second; 399 loop: 400 for (; p < iu->number_of_packets && l < s->period_size; ++p) { 401 i = iu->transfer_buffer + id[p].offset; 402 il = id[p].actual_length; 403 if (l + il > s->period_size) 404 il = s->period_size - l; 405 if (il <= ol) { 406 memcpy(o, i, il); 407 o += il; 408 ol -= il; 409 } else { 410 memcpy(o, i, ol); 411 singen_6pack(o, ol); 412 o = s->playback_to; 413 memcpy(o, i + ol, il - ol); 414 o += il - ol; 415 ol = s->period_size - s->playback1st_size; 416 } 417 l += il; 418 } 419 if (iu == sk->completed_inurb) { 420 if (l != s->period_size) 421 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, 422 l/(int)s->cfg.frame_size); 423 424 return; 425 } 426 second: 427 iu = sk->completed_inurb; 428 id = iu->iso_frame_desc; 429 p = 0; 430 goto loop; 431 432 } 433 #else 434 static void loop_back(struct usb_stream *s) 435 { 436 } 437 #endif 438 439 static void stream_idle(struct usb_stream_kernel *sk, 440 struct urb *inurb, struct urb *outurb) 441 { 442 struct usb_stream *s = sk->s; 443 int l, p; 444 int insize = s->idle_insize; 445 int urb_size = 0; 446 447 s->inpacket_split = s->next_inpacket_split; 448 s->inpacket_split_at = s->next_inpacket_split_at; 449 s->next_inpacket_split = -1; 450 s->next_inpacket_split_at = 0; 451 452 for (p = 0; p < inurb->number_of_packets; ++p) { 453 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; 454 l = id[p].actual_length; 455 if (unlikely(l == 0 || id[p].status)) { 456 snd_printk(KERN_WARNING "underrun, status=%u\n", 457 id[p].status); 458 goto err_out; 459 } 460 s->inpacket_head++; 461 s->inpacket_head %= s->inpackets; 462 if (s->inpacket_split == -1) 463 s->inpacket_split = s->inpacket_head; 464 465 s->inpacket[s->inpacket_head].offset = 466 id[p].offset + (inurb->transfer_buffer - (void *)s); 467 s->inpacket[s->inpacket_head].length = l; 468 if (insize + l > s->period_size && 469 s->next_inpacket_split == -1) { 470 s->next_inpacket_split = s->inpacket_head; 471 s->next_inpacket_split_at = s->period_size - insize; 472 } 473 insize += l; 474 urb_size += l; 475 } 476 s->idle_insize += urb_size - s->period_size; 477 if (s->idle_insize < 0) { 478 snd_printk(KERN_WARNING "%i\n", 479 (s->idle_insize)/(int)s->cfg.frame_size); 480 goto err_out; 481 } 482 s->insize_done += urb_size; 483 484 l = s->idle_outsize; 485 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - 486 sk->write_page) - l; 487 488 if (usb_stream_prepare_playback(sk, inurb) < 0) 489 goto err_out; 490 491 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; 492 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - 493 sk->write_page; 494 495 if (submit_urbs(sk, inurb, outurb) < 0) 496 goto err_out; 497 498 loop_back(s); 499 s->periods_done++; 500 wake_up_all(&sk->sleep); 501 return; 502 err_out: 503 s->state = usb_stream_xrun; 504 wake_up_all(&sk->sleep); 505 } 506 507 static void i_capture_idle(struct urb *urb) 508 { 509 struct usb_stream_kernel *sk = urb->context; 510 if (balance_capture(sk, urb)) 511 stream_idle(sk, urb, sk->i_urb); 512 } 513 514 static void i_playback_idle(struct urb *urb) 515 { 516 struct usb_stream_kernel *sk = urb->context; 517 if (balance_playback(sk, urb)) 518 stream_idle(sk, sk->i_urb, urb); 519 } 520 521 static void stream_start(struct usb_stream_kernel *sk, 522 struct urb *inurb, struct urb *outurb) 523 { 524 struct usb_stream *s = sk->s; 525 if (s->state >= usb_stream_sync1) { 526 int l, p, max_diff, max_diff_0; 527 int urb_size = 0; 528 unsigned frames_per_packet, min_frames = 0; 529 frames_per_packet = (s->period_size - s->idle_insize); 530 frames_per_packet <<= 8; 531 frames_per_packet /= 532 s->cfg.frame_size * inurb->number_of_packets; 533 frames_per_packet++; 534 535 max_diff_0 = s->cfg.frame_size; 536 if (s->cfg.period_frames >= 256) 537 max_diff_0 <<= 1; 538 if (s->cfg.period_frames >= 1024) 539 max_diff_0 <<= 1; 540 max_diff = max_diff_0; 541 for (p = 0; p < inurb->number_of_packets; ++p) { 542 int diff; 543 l = inurb->iso_frame_desc[p].actual_length; 544 urb_size += l; 545 546 min_frames += frames_per_packet; 547 diff = urb_size - 548 (min_frames >> 8) * s->cfg.frame_size; 549 if (diff < max_diff) { 550 snd_printdd(KERN_DEBUG "%i %i %i %i\n", 551 s->insize_done, 552 urb_size / (int)s->cfg.frame_size, 553 inurb->number_of_packets, diff); 554 max_diff = diff; 555 } 556 } 557 s->idle_insize -= max_diff - max_diff_0; 558 s->idle_insize += urb_size - s->period_size; 559 if (s->idle_insize < 0) { 560 snd_printk(KERN_WARNING "%i %i %i\n", 561 s->idle_insize, urb_size, s->period_size); 562 return; 563 } else if (s->idle_insize == 0) { 564 s->next_inpacket_split = 565 (s->inpacket_head + 1) % s->inpackets; 566 s->next_inpacket_split_at = 0; 567 } else { 568 unsigned split = s->inpacket_head; 569 l = s->idle_insize; 570 while (l > s->inpacket[split].length) { 571 l -= s->inpacket[split].length; 572 if (split == 0) 573 split = s->inpackets - 1; 574 else 575 split--; 576 } 577 s->next_inpacket_split = split; 578 s->next_inpacket_split_at = 579 s->inpacket[split].length - l; 580 } 581 582 s->insize_done += urb_size; 583 584 if (usb_stream_prepare_playback(sk, inurb) < 0) 585 return; 586 587 } else 588 playback_prep_freqn(sk, sk->idle_outurb); 589 590 if (submit_urbs(sk, inurb, outurb) < 0) 591 return; 592 593 if (s->state == usb_stream_sync1 && s->insize_done > 360000) { 594 /* just guesswork ^^^^^^ */ 595 s->state = usb_stream_ready; 596 subs_set_complete(sk->inurb, i_capture_idle); 597 subs_set_complete(sk->outurb, i_playback_idle); 598 } 599 } 600 601 static void i_capture_start(struct urb *urb) 602 { 603 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; 604 struct usb_stream_kernel *sk = urb->context; 605 struct usb_stream *s = sk->s; 606 int p; 607 int empty = 0; 608 609 if (urb->status) { 610 snd_printk(KERN_WARNING "status=%i\n", urb->status); 611 return; 612 } 613 614 for (p = 0; p < urb->number_of_packets; ++p) { 615 int l = id[p].actual_length; 616 if (l < s->cfg.frame_size) { 617 ++empty; 618 if (s->state >= usb_stream_sync0) { 619 snd_printk(KERN_WARNING "%i\n", l); 620 return; 621 } 622 } 623 s->inpacket_head++; 624 s->inpacket_head %= s->inpackets; 625 s->inpacket[s->inpacket_head].offset = 626 id[p].offset + (urb->transfer_buffer - (void *)s); 627 s->inpacket[s->inpacket_head].length = l; 628 } 629 #ifdef SHOW_EMPTY 630 if (empty) { 631 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, 632 urb->iso_frame_desc[0].actual_length); 633 for (pack = 1; pack < urb->number_of_packets; ++pack) { 634 int l = urb->iso_frame_desc[pack].actual_length; 635 printk(" %i", l); 636 } 637 printk("\n"); 638 } 639 #endif 640 if (!empty && s->state < usb_stream_sync1) 641 ++s->state; 642 643 if (balance_capture(sk, urb)) 644 stream_start(sk, urb, sk->i_urb); 645 } 646 647 static void i_playback_start(struct urb *urb) 648 { 649 struct usb_stream_kernel *sk = urb->context; 650 if (balance_playback(sk, urb)) 651 stream_start(sk, sk->i_urb, urb); 652 } 653 654 int usb_stream_start(struct usb_stream_kernel *sk) 655 { 656 struct usb_stream *s = sk->s; 657 int frame = 0, iters = 0; 658 int u, err; 659 int try = 0; 660 661 if (s->state != usb_stream_stopped) 662 return -EAGAIN; 663 664 subs_set_complete(sk->inurb, i_capture_start); 665 subs_set_complete(sk->outurb, i_playback_start); 666 memset(sk->write_page, 0, s->write_size); 667 dotry: 668 s->insize_done = 0; 669 s->idle_insize = 0; 670 s->idle_outsize = 0; 671 s->sync_packet = -1; 672 s->inpacket_head = -1; 673 sk->iso_frame_balance = 0; 674 ++try; 675 for (u = 0; u < 2; u++) { 676 struct urb *inurb = sk->inurb[u]; 677 struct urb *outurb = sk->outurb[u]; 678 playback_prep_freqn(sk, outurb); 679 inurb->number_of_packets = outurb->number_of_packets; 680 inurb->transfer_buffer_length = 681 inurb->number_of_packets * 682 inurb->iso_frame_desc[0].length; 683 preempt_disable(); 684 if (u == 0) { 685 int now; 686 struct usb_device *dev = inurb->dev; 687 frame = usb_get_current_frame_number(dev); 688 do { 689 now = usb_get_current_frame_number(dev); 690 ++iters; 691 } while (now > -1 && now == frame); 692 } 693 err = usb_submit_urb(inurb, GFP_ATOMIC); 694 if (err < 0) { 695 preempt_enable(); 696 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" 697 " returned %i\n", u, err); 698 return err; 699 } 700 err = usb_submit_urb(outurb, GFP_ATOMIC); 701 if (err < 0) { 702 preempt_enable(); 703 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" 704 " returned %i\n", u, err); 705 return err; 706 } 707 preempt_enable(); 708 if (inurb->start_frame != outurb->start_frame) { 709 snd_printd(KERN_DEBUG 710 "u[%i] start_frames differ in:%u out:%u\n", 711 u, inurb->start_frame, outurb->start_frame); 712 goto check_retry; 713 } 714 } 715 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); 716 try = 0; 717 check_retry: 718 if (try) { 719 usb_stream_stop(sk); 720 if (try < 5) { 721 msleep(1500); 722 snd_printd(KERN_DEBUG "goto dotry;\n"); 723 goto dotry; 724 } 725 snd_printk(KERN_WARNING"couldn't start" 726 " all urbs on the same start_frame.\n"); 727 return -EFAULT; 728 } 729 730 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; 731 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; 732 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; 733 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; 734 735 /* wait, check */ 736 { 737 int wait_ms = 3000; 738 while (s->state != usb_stream_ready && wait_ms > 0) { 739 snd_printdd(KERN_DEBUG "%i\n", s->state); 740 msleep(200); 741 wait_ms -= 200; 742 } 743 } 744 745 return s->state == usb_stream_ready ? 0 : -EFAULT; 746 } 747 748 749 /* stop */ 750 751 void usb_stream_stop(struct usb_stream_kernel *sk) 752 { 753 int u; 754 if (!sk->s) 755 return; 756 for (u = 0; u < USB_STREAM_NURBS; ++u) { 757 usb_kill_urb(sk->inurb[u]); 758 usb_kill_urb(sk->outurb[u]); 759 } 760 sk->s->state = usb_stream_stopped; 761 msleep(400); 762 } 763