sound/usb/usx2y/usb_stream.c

   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 void 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_flags = URB_ISO_ASAP;
  73                 urb->transfer_buffer = transfer;
  74                 urb->dev = dev;
  75                 urb->pipe = pipe;
  76                 urb->number_of_packets = sk->n_o_ps;
  77                 urb->context = sk;
  78                 urb->interval = 1;
  79                 if (usb_pipeout(pipe))
  80                         continue;
  81
  82                 urb->transfer_buffer_length = transfer_length;
  83                 desc = urb->iso_frame_desc;
  84                 desc->offset = 0;
  85                 desc->length = maxpacket;
  86                 for (p = 1; p < sk->n_o_ps; ++p) {
  87                         desc[p].offset = desc[p - 1].offset + maxpacket;
  88                         desc[p].length = maxpacket;
  89                 }
  90         }
  91 }
  92
  93 static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
  94                       struct usb_device *dev, int in_pipe, int out_pipe)
  95 {
  96         struct usb_stream       *s = sk->s;
  97         char                    *indata = (char *)s + sizeof(*s) +
  98                                         sizeof(struct usb_stream_packet) *
  99                                         s->inpackets;
 100         int                     u;
 101
 102         for (u = 0; u < USB_STREAM_NURBS; ++u) {
 103                 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
 104                 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
 105         }
 106
 107         init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
 108         init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
 109                        out_pipe);
 110 }
 111
 112
 113 /*
 114  * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
 115  * this will overflow at approx 524 kHz
 116  */
 117 static inline unsigned get_usb_full_speed_rate(unsigned rate)
 118 {
 119         return ((rate << 13) + 62) / 125;
 120 }
 121
 122 /*
 123  * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
 124  * this will overflow at approx 4 MHz
 125  */
 126 static inline unsigned get_usb_high_speed_rate(unsigned rate)
 127 {
 128         return ((rate << 10) + 62) / 125;
 129 }
 130
 131 void usb_stream_free(struct usb_stream_kernel *sk)
 132 {
 133         struct usb_stream *s;
 134         unsigned u;
 135
 136         for (u = 0; u < USB_STREAM_NURBS; ++u) {
 137                 usb_free_urb(sk->inurb[u]);
 138                 sk->inurb[u] = NULL;
 139                 usb_free_urb(sk->outurb[u]);
 140                 sk->outurb[u] = NULL;
 141         }
 142
 143         s = sk->s;
 144         if (!s)
 145                 return;
 146
 147         free_pages((unsigned long)sk->write_page, get_order(s->write_size));
 148         sk->write_page = NULL;
 149         free_pages((unsigned long)s, get_order(s->read_size));
 150         sk->s = NULL;
 151 }
 152
 153 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
 154                                   struct usb_device *dev,
 155                                   unsigned in_endpoint, unsigned out_endpoint,
 156                                   unsigned sample_rate, unsigned use_packsize,
 157                                   unsigned period_frames, unsigned frame_size)
 158 {
 159         int packets, max_packsize;
 160         int in_pipe, out_pipe;
 161         int read_size = sizeof(struct usb_stream);
 162         int write_size;
 163         int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000;
 164         int pg;
 165
 166         in_pipe = usb_rcvisocpipe(dev, in_endpoint);
 167         out_pipe = usb_sndisocpipe(dev, out_endpoint);
 168
 169         max_packsize = use_packsize ?
 170                 use_packsize : usb_maxpacket(dev, in_pipe, 0);
 171
 172         /*
 173                 t_period = period_frames / sample_rate
 174                 iso_packs = t_period / t_iso_frame
 175                         = (period_frames / sample_rate) * (1 / t_iso_frame)
 176         */
 177
 178         packets = period_frames * usb_frames / sample_rate + 1;
 179
 180         if (dev->speed == USB_SPEED_HIGH)
 181                 packets = (packets + 7) & ~7;
 182
 183         read_size += packets * USB_STREAM_URBDEPTH *
 184                 (max_packsize + sizeof(struct usb_stream_packet));
 185
 186         max_packsize = usb_maxpacket(dev, out_pipe, 1);
 187         write_size = max_packsize * packets * USB_STREAM_URBDEPTH;
 188
 189         if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) {
 190                 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n");
 191                 goto out;
 192         }
 193
 194         pg = get_order(read_size);
 195         sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
 196         if (!sk->s) {
 197                 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
 198                 goto out;
 199         }
 200         sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION;
 201
 202         sk->s->read_size = read_size;
 203
 204         sk->s->cfg.sample_rate = sample_rate;
 205         sk->s->cfg.frame_size = frame_size;
 206         sk->n_o_ps = packets;
 207         sk->s->inpackets = packets * USB_STREAM_URBDEPTH;
 208         sk->s->cfg.period_frames = period_frames;
 209         sk->s->period_size = frame_size * period_frames;
 210
 211         sk->s->write_size = write_size;
 212         pg = get_order(write_size);
 213
 214         sk->write_page =
 215                 (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
 216         if (!sk->write_page) {
 217                 snd_printk(KERN_WARNING "couldn't __get_free_pages()\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         init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
 229         sk->s->state = usb_stream_stopped;
 230 out:
 231         return sk->s;
 232 }
 233
 234
 235 /*                             start                                  */
 236
 237 static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb)
 238 {
 239         bool r;
 240         if (unlikely(urb->status)) {
 241                 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT)
 242                         snd_printk(KERN_WARNING "status=%i\n", urb->status);
 243                 sk->iso_frame_balance = 0x7FFFFFFF;
 244                 return false;
 245         }
 246         r = sk->iso_frame_balance == 0;
 247         if (!r)
 248                 sk->i_urb = urb;
 249         return r;
 250 }
 251
 252 static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb)
 253 {
 254         sk->iso_frame_balance += urb->number_of_packets;
 255         return balance_check(sk, urb);
 256 }
 257
 258 static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb)
 259 {
 260         sk->iso_frame_balance -= urb->number_of_packets;
 261         return balance_check(sk, urb);
 262 }
 263
 264 static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *))
 265 {
 266         int u;
 267
 268         for (u = 0; u < USB_STREAM_NURBS; u++) {
 269                 struct urb *urb = urbs[u];
 270                 urb->complete = complete;
 271         }
 272 }
 273
 274 static int usb_stream_prepare_playback(struct usb_stream_kernel *sk,
 275                 struct urb *inurb)
 276 {
 277         struct usb_stream *s = sk->s;
 278         struct urb *io;
 279         struct usb_iso_packet_descriptor *id, *od;
 280         int p = 0, lb = 0, l = 0;
 281
 282         io = sk->idle_outurb;
 283         od = io->iso_frame_desc;
 284
 285         for (; s->sync_packet < 0; ++p, ++s->sync_packet) {
 286                 struct urb *ii = sk->completed_inurb;
 287                 id = ii->iso_frame_desc +
 288                         ii->number_of_packets + s->sync_packet;
 289                 l = id->actual_length;
 290
 291                 od[p].length = l;
 292                 od[p].offset = lb;
 293                 lb += l;
 294         }
 295
 296         for (;
 297              s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps;
 298              ++p, ++s->sync_packet) {
 299                 l = inurb->iso_frame_desc[s->sync_packet].actual_length;
 300
 301                 if (s->idle_outsize + lb + l > s->period_size)
 302                         goto check_ok;
 303
 304                 od[p].length = l;
 305                 od[p].offset = lb;
 306                 lb += l;
 307         }
 308
 309 check_ok:
 310         s->sync_packet -= inurb->number_of_packets;
 311         if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) {
 312                 snd_printk(KERN_WARNING "invalid sync_packet = %i;"
 313                            " p=%i nop=%i %i %x %x %x > %x\n",
 314                            s->sync_packet, p, inurb->number_of_packets,
 315                            s->idle_outsize + lb + l,
 316                            s->idle_outsize, lb,  l,
 317                            s->period_size);
 318                 return -1;
 319         }
 320         if (unlikely(lb % s->cfg.frame_size)) {
 321                 snd_printk(KERN_WARNING"invalid outsize = %i\n",
 322                            lb);
 323                 return -1;
 324         }
 325         s->idle_outsize += lb - s->period_size;
 326         io->number_of_packets = p;
 327         io->transfer_buffer_length = lb;
 328         if (s->idle_outsize <= 0)
 329                 return 0;
 330
 331         snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize);
 332         return -1;
 333 }
 334
 335 static void prepare_inurb(int number_of_packets, struct urb *iu)
 336 {
 337         struct usb_iso_packet_descriptor *id;
 338         int p;
 339
 340         iu->number_of_packets = number_of_packets;
 341         id = iu->iso_frame_desc;
 342         id->offset = 0;
 343         for (p = 0; p < iu->number_of_packets - 1; ++p)
 344                 id[p + 1].offset = id[p].offset + id[p].length;
 345
 346         iu->transfer_buffer_length =
 347                 id[0].length * iu->number_of_packets;
 348 }
 349
 350 static int submit_urbs(struct usb_stream_kernel *sk,
 351                        struct urb *inurb, struct urb *outurb)
 352 {
 353         int err;
 354         prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
 355         err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
 356         if (err < 0) {
 357                 snd_printk(KERN_ERR "%i\n", err);
 358                 return err;
 359         }
 360         sk->idle_inurb = sk->completed_inurb;
 361         sk->completed_inurb = inurb;
 362         err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC);
 363         if (err < 0) {
 364                 snd_printk(KERN_ERR "%i\n", err);
 365                 return err;
 366         }
 367         sk->idle_outurb = sk->completed_outurb;
 368         sk->completed_outurb = outurb;
 369         return 0;
 370 }
 371
 372 #ifdef DEBUG_LOOP_BACK
 373 /*
 374   This loop_back() shows how to read/write the period data.
 375  */
 376 static void loop_back(struct usb_stream *s)
 377 {
 378         char *i, *o;
 379         int il, ol, l, p;
 380         struct urb *iu;
 381         struct usb_iso_packet_descriptor *id;
 382
 383         o = s->playback1st_to;
 384         ol = s->playback1st_size;
 385         l = 0;
 386
 387         if (s->insplit_pack >= 0) {
 388                 iu = sk->idle_inurb;
 389                 id = iu->iso_frame_desc;
 390                 p = s->insplit_pack;
 391         } else
 392                 goto second;
 393 loop:
 394         for (; p < iu->number_of_packets && l < s->period_size; ++p) {
 395                 i = iu->transfer_buffer + id[p].offset;
 396                 il = id[p].actual_length;
 397                 if (l + il > s->period_size)
 398                         il = s->period_size - l;
 399                 if (il <= ol) {
 400                         memcpy(o, i, il);
 401                         o += il;
 402                         ol -= il;
 403                 } else {
 404                         memcpy(o, i, ol);
 405                         singen_6pack(o, ol);
 406                         o = s->playback_to;
 407                         memcpy(o, i + ol, il - ol);
 408                         o += il - ol;
 409                         ol = s->period_size - s->playback1st_size;
 410                 }
 411                 l += il;
 412         }
 413         if (iu == sk->completed_inurb) {
 414                 if (l != s->period_size)
 415                         printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__,
 416                                l/(int)s->cfg.frame_size);
 417
 418                 return;
 419         }
 420 second:
 421         iu = sk->completed_inurb;
 422         id = iu->iso_frame_desc;
 423         p = 0;
 424         goto loop;
 425
 426 }
 427 #else
 428 static void loop_back(struct usb_stream *s)
 429 {
 430 }
 431 #endif
 432
 433 static void stream_idle(struct usb_stream_kernel *sk,
 434                         struct urb *inurb, struct urb *outurb)
 435 {
 436         struct usb_stream *s = sk->s;
 437         int l, p;
 438         int insize = s->idle_insize;
 439         int urb_size = 0;
 440
 441         s->inpacket_split = s->next_inpacket_split;
 442         s->inpacket_split_at = s->next_inpacket_split_at;
 443         s->next_inpacket_split = -1;
 444         s->next_inpacket_split_at = 0;
 445
 446         for (p = 0; p < inurb->number_of_packets; ++p) {
 447                 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc;
 448                 l = id[p].actual_length;
 449                 if (unlikely(l == 0 || id[p].status)) {
 450                         snd_printk(KERN_WARNING "underrun, status=%u\n",
 451                                    id[p].status);
 452                         goto err_out;
 453                 }
 454                 s->inpacket_head++;
 455                 s->inpacket_head %= s->inpackets;
 456                 if (s->inpacket_split == -1)
 457                         s->inpacket_split = s->inpacket_head;
 458
 459                 s->inpacket[s->inpacket_head].offset =
 460                         id[p].offset + (inurb->transfer_buffer - (void *)s);
 461                 s->inpacket[s->inpacket_head].length = l;
 462                 if (insize + l > s->period_size &&
 463                     s->next_inpacket_split == -1) {
 464                         s->next_inpacket_split = s->inpacket_head;
 465                         s->next_inpacket_split_at = s->period_size - insize;
 466                 }
 467                 insize += l;
 468                 urb_size += l;
 469         }
 470         s->idle_insize += urb_size - s->period_size;
 471         if (s->idle_insize < 0) {
 472                 snd_printk(KERN_WARNING "%i\n",
 473                            (s->idle_insize)/(int)s->cfg.frame_size);
 474                 goto err_out;
 475         }
 476         s->insize_done += urb_size;
 477
 478         l = s->idle_outsize;
 479         s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer -
 480                                   sk->write_page) - l;
 481
 482         if (usb_stream_prepare_playback(sk, inurb) < 0)
 483                 goto err_out;
 484
 485         s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l;
 486         s->outpacket[1].offset = sk->completed_outurb->transfer_buffer -
 487                 sk->write_page;
 488
 489         if (submit_urbs(sk, inurb, outurb) < 0)
 490                 goto err_out;
 491
 492         loop_back(s);
 493         s->periods_done++;
 494         wake_up_all(&sk->sleep);
 495         return;
 496 err_out:
 497         s->state = usb_stream_xrun;
 498         wake_up_all(&sk->sleep);
 499 }
 500
 501 static void i_capture_idle(struct urb *urb)
 502 {
 503         struct usb_stream_kernel *sk = urb->context;
 504         if (balance_capture(sk, urb))
 505                 stream_idle(sk, urb, sk->i_urb);
 506 }
 507
 508 static void i_playback_idle(struct urb *urb)
 509 {
 510         struct usb_stream_kernel *sk = urb->context;
 511         if (balance_playback(sk, urb))
 512                 stream_idle(sk, sk->i_urb, urb);
 513 }
 514
 515 static void stream_start(struct usb_stream_kernel *sk,
 516                          struct urb *inurb, struct urb *outurb)
 517 {
 518         struct usb_stream *s = sk->s;
 519         if (s->state >= usb_stream_sync1) {
 520                 int l, p, max_diff, max_diff_0;
 521                 int urb_size = 0;
 522                 unsigned frames_per_packet, min_frames = 0;
 523                 frames_per_packet = (s->period_size - s->idle_insize);
 524                 frames_per_packet <<= 8;
 525                 frames_per_packet /=
 526                         s->cfg.frame_size * inurb->number_of_packets;
 527                 frames_per_packet++;
 528
 529                 max_diff_0 = s->cfg.frame_size;
 530                 if (s->cfg.period_frames >= 256)
 531                         max_diff_0 <<= 1;
 532                 if (s->cfg.period_frames >= 1024)
 533                         max_diff_0 <<= 1;
 534                 max_diff = max_diff_0;
 535                 for (p = 0; p < inurb->number_of_packets; ++p) {
 536                         int diff;
 537                         l = inurb->iso_frame_desc[p].actual_length;
 538                         urb_size += l;
 539
 540                         min_frames += frames_per_packet;
 541                         diff = urb_size -
 542                                 (min_frames >> 8) * s->cfg.frame_size;
 543                         if (diff < max_diff) {
 544                                 snd_printdd(KERN_DEBUG "%i %i %i %i\n",
 545                                             s->insize_done,
 546                                             urb_size / (int)s->cfg.frame_size,
 547                                             inurb->number_of_packets, diff);
 548                                 max_diff = diff;
 549                         }
 550                 }
 551                 s->idle_insize -= max_diff - max_diff_0;
 552                 s->idle_insize += urb_size - s->period_size;
 553                 if (s->idle_insize < 0) {
 554                         snd_printk(KERN_WARNING "%i %i %i\n",
 555                                    s->idle_insize, urb_size, s->period_size);
 556                         return;
 557                 } else if (s->idle_insize == 0) {
 558                         s->next_inpacket_split =
 559                                 (s->inpacket_head + 1) % s->inpackets;
 560                         s->next_inpacket_split_at = 0;
 561                 } else {
 562                         unsigned split = s->inpacket_head;
 563                         l = s->idle_insize;
 564                         while (l > s->inpacket[split].length) {
 565                                 l -= s->inpacket[split].length;
 566                                 if (split == 0)
 567                                         split = s->inpackets - 1;
 568                                 else
 569                                         split--;
 570                         }
 571                         s->next_inpacket_split = split;
 572                         s->next_inpacket_split_at =
 573                                 s->inpacket[split].length - l;
 574                 }
 575
 576                 s->insize_done += urb_size;
 577
 578                 if (usb_stream_prepare_playback(sk, inurb) < 0)
 579                         return;
 580
 581         } else
 582                 playback_prep_freqn(sk, sk->idle_outurb);
 583
 584         if (submit_urbs(sk, inurb, outurb) < 0)
 585                 return;
 586
 587         if (s->state == usb_stream_sync1 && s->insize_done > 360000) {
 588                 /* just guesswork                            ^^^^^^ */
 589                 s->state = usb_stream_ready;
 590                 subs_set_complete(sk->inurb, i_capture_idle);
 591                 subs_set_complete(sk->outurb, i_playback_idle);
 592         }
 593 }
 594
 595 static void i_capture_start(struct urb *urb)
 596 {
 597         struct usb_iso_packet_descriptor *id = urb->iso_frame_desc;
 598         struct usb_stream_kernel *sk = urb->context;
 599         struct usb_stream *s = sk->s;
 600         int p;
 601         int empty = 0;
 602
 603         if (urb->status) {
 604                 snd_printk(KERN_WARNING "status=%i\n", urb->status);
 605                 return;
 606         }
 607
 608         for (p = 0; p < urb->number_of_packets; ++p) {
 609                 int l = id[p].actual_length;
 610                 if (l < s->cfg.frame_size) {
 611                         ++empty;
 612                         if (s->state >= usb_stream_sync0) {
 613                                 snd_printk(KERN_WARNING "%i\n", l);
 614                                 return;
 615                         }
 616                 }
 617                 s->inpacket_head++;
 618                 s->inpacket_head %= s->inpackets;
 619                 s->inpacket[s->inpacket_head].offset =
 620                         id[p].offset + (urb->transfer_buffer - (void *)s);
 621                 s->inpacket[s->inpacket_head].length = l;
 622         }
 623 #ifdef SHOW_EMPTY
 624         if (empty) {
 625                 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__,
 626                        urb->iso_frame_desc[0].actual_length);
 627                 for (pack = 1; pack < urb->number_of_packets; ++pack) {
 628                         int l = urb->iso_frame_desc[pack].actual_length;
 629                         printk(" %i", l);
 630                 }
 631                 printk("\n");
 632         }
 633 #endif
 634         if (!empty && s->state < usb_stream_sync1)
 635                 ++s->state;
 636
 637         if (balance_capture(sk, urb))
 638                 stream_start(sk, urb, sk->i_urb);
 639 }
 640
 641 static void i_playback_start(struct urb *urb)
 642 {
 643         struct usb_stream_kernel *sk = urb->context;
 644         if (balance_playback(sk, urb))
 645                 stream_start(sk, sk->i_urb, urb);
 646 }
 647
 648 int usb_stream_start(struct usb_stream_kernel *sk)
 649 {
 650         struct usb_stream *s = sk->s;
 651         int frame = 0, iters = 0;
 652         int u, err;
 653         int try = 0;
 654
 655         if (s->state != usb_stream_stopped)
 656                 return -EAGAIN;
 657
 658         subs_set_complete(sk->inurb, i_capture_start);
 659         subs_set_complete(sk->outurb, i_playback_start);
 660         memset(sk->write_page, 0, s->write_size);
 661 dotry:
 662         s->insize_done = 0;
 663         s->idle_insize = 0;
 664         s->idle_outsize = 0;
 665         s->sync_packet = -1;
 666         s->inpacket_head = -1;
 667         sk->iso_frame_balance = 0;
 668         ++try;
 669         for (u = 0; u < 2; u++) {
 670                 struct urb *inurb = sk->inurb[u];
 671                 struct urb *outurb = sk->outurb[u];
 672                 playback_prep_freqn(sk, outurb);
 673                 inurb->number_of_packets = outurb->number_of_packets;
 674                 inurb->transfer_buffer_length =
 675                         inurb->number_of_packets *
 676                         inurb->iso_frame_desc[0].length;
 677
 678                 if (u == 0) {
 679                         int now;
 680                         struct usb_device *dev = inurb->dev;
 681                         frame = usb_get_current_frame_number(dev);
 682                         do {
 683                                 now = usb_get_current_frame_number(dev);
 684                                 ++iters;
 685                         } while (now > -1 && now == frame);
 686                 }
 687                 err = usb_submit_urb(inurb, GFP_ATOMIC);
 688                 if (err < 0) {
 689                         snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])"
 690                                    " returned %i\n", u, err);
 691                         return err;
 692                 }
 693                 err = usb_submit_urb(outurb, GFP_ATOMIC);
 694                 if (err < 0) {
 695                         snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])"
 696                                    " returned %i\n", u, err);
 697                         return err;
 698                 }
 699
 700                 if (inurb->start_frame != outurb->start_frame) {
 701                         snd_printd(KERN_DEBUG
 702                                    "u[%i] start_frames differ in:%u out:%u\n",
 703                                    u, inurb->start_frame, outurb->start_frame);
 704                         goto check_retry;
 705                 }
 706         }
 707         snd_printdd(KERN_DEBUG "%i %i\n", frame, iters);
 708         try = 0;
 709 check_retry:
 710         if (try) {
 711                 usb_stream_stop(sk);
 712                 if (try < 5) {
 713                         msleep(1500);
 714                         snd_printd(KERN_DEBUG "goto dotry;\n");
 715                         goto dotry;
 716                 }
 717                 snd_printk(KERN_WARNING"couldn't start"
 718                            " all urbs on the same start_frame.\n");
 719                 return -EFAULT;
 720         }
 721
 722         sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2];
 723         sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2];
 724         sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1];
 725         sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1];
 726
 727 /* wait, check */
 728         {
 729                 int wait_ms = 3000;
 730                 while (s->state != usb_stream_ready && wait_ms > 0) {
 731                         snd_printdd(KERN_DEBUG "%i\n", s->state);
 732                         msleep(200);
 733                         wait_ms -= 200;
 734                 }
 735         }
 736
 737         return s->state == usb_stream_ready ? 0 : -EFAULT;
 738 }
 739
 740
 741 /*                             stop                                   */
 742
 743 void usb_stream_stop(struct usb_stream_kernel *sk)
 744 {
 745         int u;
 746         if (!sk->s)
 747                 return;
 748         for (u = 0; u < USB_STREAM_NURBS; ++u) {
 749                 usb_kill_urb(sk->inurb[u]);
 750                 usb_kill_urb(sk->outurb[u]);
 751         }
 752         sk->s->state = usb_stream_stopped;
 753         msleep(400);
 754 }