1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de> 4 */ 5 6 #include <linux/usb.h> 7 #include <linux/gfp.h> 8 9 #include "usb_stream.h" 10 11 /* setup */ 12 usb_stream_next_packet_size(struct usb_stream_kernel * sk)13 static unsigned int usb_stream_next_packet_size(struct usb_stream_kernel *sk) 14 { 15 struct usb_stream *s = sk->s; 16 17 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; 18 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; 19 } 20 playback_prep_freqn(struct usb_stream_kernel * sk,struct urb * urb)21 static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) 22 { 23 struct usb_stream *s = sk->s; 24 int pack, lb = 0; 25 26 for (pack = 0; pack < sk->n_o_ps; pack++) { 27 int l = usb_stream_next_packet_size(sk); 28 29 if (s->idle_outsize + lb + l > s->period_size) 30 goto check; 31 32 sk->out_phase = sk->out_phase_peeked; 33 urb->iso_frame_desc[pack].offset = lb; 34 urb->iso_frame_desc[pack].length = l; 35 lb += l; 36 } 37 38 check: 39 urb->number_of_packets = pack; 40 urb->transfer_buffer_length = lb; 41 s->idle_outsize += lb - s->period_size; 42 } 43 init_pipe_urbs(struct usb_stream_kernel * sk,unsigned int use_packsize,struct urb ** urbs,char * transfer,struct usb_device * dev,int pipe)44 static int init_pipe_urbs(struct usb_stream_kernel *sk, 45 unsigned int use_packsize, 46 struct urb **urbs, char *transfer, 47 struct usb_device *dev, int pipe) 48 { 49 int u, p; 50 int maxpacket = use_packsize ? 51 use_packsize : usb_maxpacket(dev, pipe); 52 int transfer_length = maxpacket * sk->n_o_ps; 53 54 for (u = 0; u < USB_STREAM_NURBS; 55 ++u, transfer += transfer_length) { 56 struct urb *urb = urbs[u]; 57 struct usb_iso_packet_descriptor *desc; 58 59 urb->transfer_buffer = transfer; 60 urb->dev = dev; 61 urb->pipe = pipe; 62 urb->number_of_packets = sk->n_o_ps; 63 urb->context = sk; 64 urb->interval = 1; 65 if (usb_pipeout(pipe)) 66 continue; 67 if (usb_urb_ep_type_check(urb)) 68 return -EINVAL; 69 70 urb->transfer_buffer_length = transfer_length; 71 desc = urb->iso_frame_desc; 72 desc->offset = 0; 73 desc->length = maxpacket; 74 for (p = 1; p < sk->n_o_ps; ++p) { 75 desc[p].offset = desc[p - 1].offset + maxpacket; 76 desc[p].length = maxpacket; 77 } 78 } 79 80 return 0; 81 } 82 init_urbs(struct usb_stream_kernel * sk,unsigned int use_packsize,struct usb_device * dev,int in_pipe,int out_pipe)83 static int init_urbs(struct usb_stream_kernel *sk, unsigned int use_packsize, 84 struct usb_device *dev, int in_pipe, int out_pipe) 85 { 86 struct usb_stream *s = sk->s; 87 char *indata = 88 (char *)s + sizeof(*s) + sizeof(struct usb_stream_packet) * s->inpackets; 89 int u; 90 91 for (u = 0; u < USB_STREAM_NURBS; ++u) { 92 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 93 if (!sk->inurb[u]) 94 return -ENOMEM; 95 96 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 97 if (!sk->outurb[u]) 98 return -ENOMEM; 99 } 100 101 if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) || 102 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, 103 out_pipe)) 104 return -EINVAL; 105 106 return 0; 107 } 108 109 /* 110 * convert a sampling rate into our full speed format (fs/1000 in Q16.16) 111 * this will overflow at approx 524 kHz 112 */ get_usb_full_speed_rate(unsigned int rate)113 static inline unsigned int get_usb_full_speed_rate(unsigned int rate) 114 { 115 return ((rate << 13) + 62) / 125; 116 } 117 118 /* 119 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) 120 * this will overflow at approx 4 MHz 121 */ get_usb_high_speed_rate(unsigned int rate)122 static inline unsigned int get_usb_high_speed_rate(unsigned int rate) 123 { 124 return ((rate << 10) + 62) / 125; 125 } 126 usb_stream_free(struct usb_stream_kernel * sk)127 void usb_stream_free(struct usb_stream_kernel *sk) 128 { 129 struct usb_stream *s; 130 unsigned int u; 131 132 for (u = 0; u < USB_STREAM_NURBS; ++u) { 133 usb_free_urb(sk->inurb[u]); 134 sk->inurb[u] = NULL; 135 usb_free_urb(sk->outurb[u]); 136 sk->outurb[u] = NULL; 137 } 138 139 s = sk->s; 140 if (!s) 141 return; 142 143 if (sk->write_page) { 144 free_pages_exact(sk->write_page, s->write_size); 145 sk->write_page = NULL; 146 } 147 148 free_pages_exact(s, s->read_size); 149 sk->s = NULL; 150 } 151 usb_stream_new(struct usb_stream_kernel * sk,struct usb_device * dev,unsigned int in_endpoint,unsigned int out_endpoint,unsigned int sample_rate,unsigned int use_packsize,unsigned int period_frames,unsigned int frame_size)152 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, 153 struct usb_device *dev, 154 unsigned int in_endpoint, 155 unsigned int out_endpoint, 156 unsigned int sample_rate, 157 unsigned int use_packsize, 158 unsigned int period_frames, 159 unsigned int frame_size) 160 { 161 int packets, max_packsize; 162 int in_pipe, out_pipe; 163 int read_size = sizeof(struct usb_stream); 164 int write_size; 165 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; 166 167 in_pipe = usb_rcvisocpipe(dev, in_endpoint); 168 out_pipe = usb_sndisocpipe(dev, out_endpoint); 169 170 max_packsize = use_packsize ? 171 use_packsize : usb_maxpacket(dev, in_pipe); 172 173 /* 174 t_period = period_frames / sample_rate 175 iso_packs = t_period / t_iso_frame 176 = (period_frames / sample_rate) * (1 / t_iso_frame) 177 */ 178 179 packets = period_frames * usb_frames / sample_rate + 1; 180 181 if (dev->speed == USB_SPEED_HIGH) 182 packets = (packets + 7) & ~7; 183 184 read_size += packets * USB_STREAM_URBDEPTH * 185 (max_packsize + sizeof(struct usb_stream_packet)); 186 187 max_packsize = usb_maxpacket(dev, out_pipe); 188 write_size = max_packsize * packets * USB_STREAM_URBDEPTH; 189 190 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { 191 dev_warn(&dev->dev, "%s: a size exceeds 128*PAGE_SIZE\n", __func__); 192 goto out; 193 } 194 195 sk->s = alloc_pages_exact(read_size, 196 GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); 197 if (!sk->s) { 198 dev_warn(&dev->dev, "us122l: couldn't allocate read buffer\n"); 199 goto out; 200 } 201 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; 202 203 sk->s->read_size = read_size; 204 205 sk->s->cfg.sample_rate = sample_rate; 206 sk->s->cfg.frame_size = frame_size; 207 sk->n_o_ps = packets; 208 sk->s->inpackets = packets * USB_STREAM_URBDEPTH; 209 sk->s->cfg.period_frames = period_frames; 210 sk->s->period_size = frame_size * period_frames; 211 212 sk->s->write_size = write_size; 213 214 sk->write_page = alloc_pages_exact(write_size, 215 GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); 216 if (!sk->write_page) { 217 dev_warn(&dev->dev, "us122l: couldn't allocate write buffer\n"); 218 usb_stream_free(sk); 219 return NULL; 220 } 221 222 /* calculate the frequency in 16.16 format */ 223 if (dev->speed == USB_SPEED_FULL) 224 sk->freqn = get_usb_full_speed_rate(sample_rate); 225 else 226 sk->freqn = get_usb_high_speed_rate(sample_rate); 227 228 if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) { 229 usb_stream_free(sk); 230 return NULL; 231 } 232 233 sk->s->state = usb_stream_stopped; 234 out: 235 return sk->s; 236 } 237 238 /* start */ 239 balance_check(struct usb_stream_kernel * sk,struct urb * urb)240 static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) 241 { 242 bool r; 243 244 if (unlikely(urb->status)) { 245 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) 246 dev_warn(&sk->dev->dev, "%s: status=%i\n", __func__, 247 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 balance_playback(struct usb_stream_kernel * sk,struct urb * urb)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 balance_capture(struct usb_stream_kernel * sk,struct urb * urb)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 subs_set_complete(struct urb ** urbs,void (* complete)(struct urb *))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]; 275 276 urb->complete = complete; 277 } 278 } 279 usb_stream_prepare_playback(struct usb_stream_kernel * sk,struct urb * inurb)280 static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, 281 struct urb *inurb) 282 { 283 struct usb_stream *s = sk->s; 284 struct urb *io; 285 struct usb_iso_packet_descriptor *id, *od; 286 int p = 0, lb = 0, l = 0; 287 288 io = sk->idle_outurb; 289 od = io->iso_frame_desc; 290 291 for (; s->sync_packet < 0; ++p, ++s->sync_packet) { 292 struct urb *ii = sk->completed_inurb; 293 294 id = ii->iso_frame_desc + 295 ii->number_of_packets + s->sync_packet; 296 l = id->actual_length; 297 298 od[p].length = l; 299 od[p].offset = lb; 300 lb += l; 301 } 302 303 for (; 304 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; 305 ++p, ++s->sync_packet) { 306 l = inurb->iso_frame_desc[s->sync_packet].actual_length; 307 308 if (s->idle_outsize + lb + l > s->period_size) 309 goto check_ok; 310 311 od[p].length = l; 312 od[p].offset = lb; 313 lb += l; 314 } 315 316 check_ok: 317 s->sync_packet -= inurb->number_of_packets; 318 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) { 319 dev_warn(&sk->dev->dev, 320 "%s: invalid sync_packet = %i; p=%i nop=%i %i %x %x %x > %x\n", 321 __func__, 322 s->sync_packet, p, inurb->number_of_packets, 323 s->idle_outsize + lb + l, 324 s->idle_outsize, lb, l, 325 s->period_size); 326 return -1; 327 } 328 if (unlikely(lb % s->cfg.frame_size)) { 329 dev_warn(&sk->dev->dev, "%s: invalid outsize = %i\n", 330 __func__, lb); 331 return -1; 332 } 333 s->idle_outsize += lb - s->period_size; 334 io->number_of_packets = p; 335 io->transfer_buffer_length = lb; 336 if (s->idle_outsize <= 0) 337 return 0; 338 339 dev_warn(&sk->dev->dev, "%s: idle=%i\n", __func__, s->idle_outsize); 340 return -1; 341 } 342 prepare_inurb(int number_of_packets,struct urb * iu)343 static void prepare_inurb(int number_of_packets, struct urb *iu) 344 { 345 struct usb_iso_packet_descriptor *id; 346 int p; 347 348 iu->number_of_packets = number_of_packets; 349 id = iu->iso_frame_desc; 350 id->offset = 0; 351 for (p = 0; p < iu->number_of_packets - 1; ++p) 352 id[p + 1].offset = id[p].offset + id[p].length; 353 354 iu->transfer_buffer_length = 355 id[0].length * iu->number_of_packets; 356 } 357 submit_urbs(struct usb_stream_kernel * sk,struct urb * inurb,struct urb * outurb)358 static int submit_urbs(struct usb_stream_kernel *sk, 359 struct urb *inurb, struct urb *outurb) 360 { 361 int err; 362 363 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); 364 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); 365 if (err < 0) 366 goto report_failure; 367 368 sk->idle_inurb = sk->completed_inurb; 369 sk->completed_inurb = inurb; 370 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); 371 if (err < 0) 372 goto report_failure; 373 374 sk->idle_outurb = sk->completed_outurb; 375 sk->completed_outurb = outurb; 376 return 0; 377 378 report_failure: 379 dev_err(&sk->dev->dev, "%s error: %i\n", __func__, err); 380 return err; 381 } 382 383 #ifdef DEBUG_LOOP_BACK 384 /* 385 This loop_back() shows how to read/write the period data. 386 */ loop_back(struct usb_stream * s)387 static void loop_back(struct usb_stream *s) 388 { 389 char *i, *o; 390 int il, ol, l, p; 391 struct urb *iu; 392 struct usb_iso_packet_descriptor *id; 393 394 o = s->playback1st_to; 395 ol = s->playback1st_size; 396 l = 0; 397 398 if (s->insplit_pack >= 0) { 399 iu = sk->idle_inurb; 400 id = iu->iso_frame_desc; 401 p = s->insplit_pack; 402 } else 403 goto second; 404 loop: 405 for (; p < iu->number_of_packets && l < s->period_size; ++p) { 406 i = iu->transfer_buffer + id[p].offset; 407 il = id[p].actual_length; 408 if (l + il > s->period_size) 409 il = s->period_size - l; 410 if (il <= ol) { 411 memcpy(o, i, il); 412 o += il; 413 ol -= il; 414 } else { 415 memcpy(o, i, ol); 416 singen_6pack(o, ol); 417 o = s->playback_to; 418 memcpy(o, i + ol, il - ol); 419 o += il - ol; 420 ol = s->period_size - s->playback1st_size; 421 } 422 l += il; 423 } 424 if (iu == sk->completed_inurb) { 425 if (l != s->period_size) 426 dev_dbg(&sk->dev->dev, "%s:%i %i\n", __func__, __LINE__, 427 l/(int)s->cfg.frame_size); 428 429 return; 430 } 431 second: 432 iu = sk->completed_inurb; 433 id = iu->iso_frame_desc; 434 p = 0; 435 goto loop; 436 437 } 438 #else loop_back(struct usb_stream * s)439 static void loop_back(struct usb_stream *s) 440 { 441 } 442 #endif 443 stream_idle(struct usb_stream_kernel * sk,struct urb * inurb,struct urb * outurb)444 static void stream_idle(struct usb_stream_kernel *sk, 445 struct urb *inurb, struct urb *outurb) 446 { 447 struct usb_stream *s = sk->s; 448 int l, p; 449 int insize = s->idle_insize; 450 int urb_size = 0; 451 452 s->inpacket_split = s->next_inpacket_split; 453 s->inpacket_split_at = s->next_inpacket_split_at; 454 s->next_inpacket_split = -1; 455 s->next_inpacket_split_at = 0; 456 457 for (p = 0; p < inurb->number_of_packets; ++p) { 458 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; 459 460 l = id[p].actual_length; 461 if (unlikely(l == 0 || id[p].status)) { 462 dev_warn(&sk->dev->dev, "%s: underrun, status=%u\n", 463 __func__, id[p].status); 464 goto err_out; 465 } 466 s->inpacket_head++; 467 s->inpacket_head %= s->inpackets; 468 if (s->inpacket_split == -1) 469 s->inpacket_split = s->inpacket_head; 470 471 s->inpacket[s->inpacket_head].offset = 472 id[p].offset + (inurb->transfer_buffer - (void *)s); 473 s->inpacket[s->inpacket_head].length = l; 474 if (insize + l > s->period_size && 475 s->next_inpacket_split == -1) { 476 s->next_inpacket_split = s->inpacket_head; 477 s->next_inpacket_split_at = s->period_size - insize; 478 } 479 insize += l; 480 urb_size += l; 481 } 482 s->idle_insize += urb_size - s->period_size; 483 if (s->idle_insize < 0) { 484 dev_warn(&sk->dev->dev, "%s error: %i\n", __func__, 485 (s->idle_insize)/(int)s->cfg.frame_size); 486 goto err_out; 487 } 488 s->insize_done += urb_size; 489 490 l = s->idle_outsize; 491 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - 492 sk->write_page) - l; 493 494 if (usb_stream_prepare_playback(sk, inurb) < 0) 495 goto err_out; 496 497 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; 498 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - 499 sk->write_page; 500 501 if (submit_urbs(sk, inurb, outurb) < 0) 502 goto err_out; 503 504 loop_back(s); 505 s->periods_done++; 506 wake_up_all(&sk->sleep); 507 return; 508 err_out: 509 s->state = usb_stream_xrun; 510 wake_up_all(&sk->sleep); 511 } 512 i_capture_idle(struct urb * urb)513 static void i_capture_idle(struct urb *urb) 514 { 515 struct usb_stream_kernel *sk = urb->context; 516 517 if (balance_capture(sk, urb)) 518 stream_idle(sk, urb, sk->i_urb); 519 } 520 i_playback_idle(struct urb * urb)521 static void i_playback_idle(struct urb *urb) 522 { 523 struct usb_stream_kernel *sk = urb->context; 524 525 if (balance_playback(sk, urb)) 526 stream_idle(sk, sk->i_urb, urb); 527 } 528 stream_start(struct usb_stream_kernel * sk,struct urb * inurb,struct urb * outurb)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; 533 534 if (s->state >= usb_stream_sync1) { 535 int l, p, max_diff, max_diff_0; 536 int urb_size = 0; 537 unsigned int frames_per_packet, min_frames = 0; 538 539 frames_per_packet = (s->period_size - s->idle_insize); 540 frames_per_packet <<= 8; 541 frames_per_packet /= 542 s->cfg.frame_size * inurb->number_of_packets; 543 frames_per_packet++; 544 545 max_diff_0 = s->cfg.frame_size; 546 if (s->cfg.period_frames >= 256) 547 max_diff_0 <<= 1; 548 if (s->cfg.period_frames >= 1024) 549 max_diff_0 <<= 1; 550 max_diff = max_diff_0; 551 for (p = 0; p < inurb->number_of_packets; ++p) { 552 int diff; 553 554 l = inurb->iso_frame_desc[p].actual_length; 555 urb_size += l; 556 557 min_frames += frames_per_packet; 558 diff = urb_size - 559 (min_frames >> 8) * s->cfg.frame_size; 560 if (diff < max_diff) 561 max_diff = diff; 562 } 563 s->idle_insize -= max_diff - max_diff_0; 564 s->idle_insize += urb_size - s->period_size; 565 if (s->idle_insize < 0) { 566 dev_warn(&sk->dev->dev, "%s idle_insize: %i %i %i\n", 567 __func__, 568 s->idle_insize, urb_size, s->period_size); 569 return; 570 } else if (s->idle_insize == 0) { 571 s->next_inpacket_split = 572 (s->inpacket_head + 1) % s->inpackets; 573 s->next_inpacket_split_at = 0; 574 } else { 575 unsigned int split = s->inpacket_head; 576 577 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 i_capture_start(struct urb * urb)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 dev_warn(&sk->dev->dev, "%s: status=%i\n", __func__, urb->status); 619 return; 620 } 621 622 for (p = 0; p < urb->number_of_packets; ++p) { 623 int l = id[p].actual_length; 624 625 if (l < s->cfg.frame_size) { 626 ++empty; 627 if (s->state >= usb_stream_sync0) { 628 dev_warn(&sk->dev->dev, "%s: length %i\n", __func__, l); 629 return; 630 } 631 } 632 s->inpacket_head++; 633 s->inpacket_head %= s->inpackets; 634 s->inpacket[s->inpacket_head].offset = 635 id[p].offset + (urb->transfer_buffer - (void *)s); 636 s->inpacket[s->inpacket_head].length = l; 637 } 638 #ifdef SHOW_EMPTY 639 if (empty) { 640 dev_dbg(&sk->dev->dev, "%s:%i: %i", __func__, __LINE__, 641 urb->iso_frame_desc[0].actual_length); 642 for (pack = 1; pack < urb->number_of_packets; ++pack) { 643 int l = urb->iso_frame_desc[pack].actual_length; 644 645 printk(KERN_CONT " %i", l); 646 } 647 printk(KERN_CONT "\n"); 648 } 649 #endif 650 if (!empty && s->state < usb_stream_sync1) 651 ++s->state; 652 653 if (balance_capture(sk, urb)) 654 stream_start(sk, urb, sk->i_urb); 655 } 656 i_playback_start(struct urb * urb)657 static void i_playback_start(struct urb *urb) 658 { 659 struct usb_stream_kernel *sk = urb->context; 660 661 if (balance_playback(sk, urb)) 662 stream_start(sk, sk->i_urb, urb); 663 } 664 usb_stream_start(struct usb_stream_kernel * sk)665 int usb_stream_start(struct usb_stream_kernel *sk) 666 { 667 struct usb_stream *s = sk->s; 668 int frame = 0; 669 int u, err; 670 int try = 0; 671 672 if (s->state != usb_stream_stopped) 673 return -EAGAIN; 674 675 subs_set_complete(sk->inurb, i_capture_start); 676 subs_set_complete(sk->outurb, i_playback_start); 677 memset(sk->write_page, 0, s->write_size); 678 dotry: 679 s->insize_done = 0; 680 s->idle_insize = 0; 681 s->idle_outsize = 0; 682 s->sync_packet = -1; 683 s->inpacket_head = -1; 684 sk->iso_frame_balance = 0; 685 ++try; 686 for (u = 0; u < 2; u++) { 687 struct urb *inurb = sk->inurb[u]; 688 struct urb *outurb = sk->outurb[u]; 689 690 playback_prep_freqn(sk, outurb); 691 inurb->number_of_packets = outurb->number_of_packets; 692 inurb->transfer_buffer_length = 693 inurb->number_of_packets * 694 inurb->iso_frame_desc[0].length; 695 696 if (u == 0) { 697 int now; 698 struct usb_device *dev = inurb->dev; 699 700 frame = usb_get_current_frame_number(dev); 701 do { 702 now = usb_get_current_frame_number(dev); 703 } while (now > -1 && now == frame); 704 } 705 err = usb_submit_urb(inurb, GFP_ATOMIC); 706 if (err < 0) { 707 dev_err(&sk->dev->dev, 708 "%s: usb_submit_urb(sk->inurb[%i]) returned %i\n", 709 __func__, u, err); 710 return err; 711 } 712 err = usb_submit_urb(outurb, GFP_ATOMIC); 713 if (err < 0) { 714 dev_err(&sk->dev->dev, 715 "%s: usb_submit_urb(sk->outurb[%i]) returned %i\n", 716 __func__, u, err); 717 return err; 718 } 719 720 if (inurb->start_frame != outurb->start_frame) { 721 dev_dbg(&sk->dev->dev, 722 "%s: u[%i] start_frames differ in:%u out:%u\n", 723 __func__, u, inurb->start_frame, outurb->start_frame); 724 goto check_retry; 725 } 726 } 727 try = 0; 728 check_retry: 729 if (try) { 730 usb_stream_stop(sk); 731 if (try < 5) { 732 msleep(1500); 733 dev_dbg(&sk->dev->dev, "goto dotry;\n"); 734 goto dotry; 735 } 736 dev_warn(&sk->dev->dev, 737 "%s: couldn't start all urbs on the same start_frame.\n", 738 __func__); 739 return -EFAULT; 740 } 741 742 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; 743 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; 744 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; 745 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; 746 747 /* wait, check */ 748 { 749 int wait_ms = 3000; 750 751 while (s->state != usb_stream_ready && wait_ms > 0) { 752 msleep(200); 753 wait_ms -= 200; 754 } 755 } 756 757 return s->state == usb_stream_ready ? 0 : -EFAULT; 758 } 759 760 761 /* stop */ 762 usb_stream_stop(struct usb_stream_kernel * sk)763 void usb_stream_stop(struct usb_stream_kernel *sk) 764 { 765 int u; 766 767 if (!sk->s) 768 return; 769 for (u = 0; u < USB_STREAM_NURBS; ++u) { 770 usb_kill_urb(sk->inurb[u]); 771 usb_kill_urb(sk->outurb[u]); 772 } 773 sk->s->state = usb_stream_stopped; 774 msleep(400); 775 } 776