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_buffer = transfer;
  73                 urb->dev = dev;
  74                 urb->pipe = pipe;
  75                 urb->number_of_packets = sk->n_o_ps;
  76                 urb->context = sk;
  77                 urb->interval = 1;
  78                 if (usb_pipeout(pipe))
  79                         continue;
  80
  81                 urb->transfer_buffer_length = transfer_length;
  82                 desc = urb->iso_frame_desc;
  83                 desc->offset = 0;
  84                 desc->length = maxpacket;
  85                 for (p = 1; p < sk->n_o_ps; ++p) {
  86                         desc[p].offset = desc[p - 1].offset + maxpacket;
  87                         desc[p].length = maxpacket;
  88                 }
  89         }
  90 }
  91
  92 static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
  93                       struct usb_device *dev, int in_pipe, int out_pipe)
  94 {
  95         struct usb_stream       *s = sk->s;
  96         char                    *indata = (char *)s + sizeof(*s) +
  97                                         sizeof(struct usb_stream_packet) *
  98                                         s->inpackets;
  99         int                     u;
 100
 101         for (u = 0; u < USB_STREAM_NURBS; ++u) {
 102                 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
 103                 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
 104         }
 105
 106         init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
 107         init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
 108                        out_pipe);
 109 }
 110
 111
 112 /*
 113  * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
 114  * this will overflow at approx 524 kHz
 115  */
 116 static inline unsigned get_usb_full_speed_rate(unsigned rate)
 117 {
 118         return ((rate << 13) + 62) / 125;
 119 }
 120
 121 /*
 122  * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
 123  * this will overflow at approx 4 MHz
 124  */
 125 static inline unsigned get_usb_high_speed_rate(unsigned rate)
 126 {
 127         return ((rate << 10) + 62) / 125;
 128 }
 129
 130 void usb_stream_free(struct usb_stream_kernel *sk)
 131 {
 132         struct usb_stream *s;
 133         unsigned u;
 134
 135         for (u = 0; u < USB_STREAM_NURBS; ++u) {
 136                 usb_free_urb(sk->inurb[u]);
 137                 sk->inurb[u] = NULL;
 138                 usb_free_urb(sk->outurb[u]);
 139                 sk->outurb[u] = NULL;
 140         }
 141
 142         s = sk->s;
 143         if (!s)
 144                 return;
 145
 146         free_pages((unsigned long)sk->write_page, get_order(s->write_size));
 147         sk->write_page = NULL;
 148         free_pages((unsigned long)s, get_order(s->read_size));
 149         sk->s = NULL;
 150 }
 151
 152 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
 153                                   struct usb_device *dev,
 154                                   unsigned in_endpoint, unsigned out_endpoint,
 155                                   unsigned sample_rate, unsigned use_packsize,
 156                                   unsigned period_frames, unsigned frame_size)
 157 {
 158         int packets, max_packsize;
 159         int in_pipe, out_pipe;
 160         int read_size = sizeof(struct usb_stream);
 161         int write_size;
 162         int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000;
 163         int pg;
 164
 165         in_pipe = usb_rcvisocpipe(dev, in_endpoint);
 166         out_pipe = usb_sndisocpipe(dev, out_endpoint);
 167
 168         max_packsize = use_packsize ?
 169                 use_packsize : usb_maxpacket(dev, in_pipe, 0);
 170
 171         /*
 172                 t_period = period_frames / sample_rate
 173                 iso_packs = t_period / t_iso_frame
 174                         = (period_frames / sample_rate) * (1 / t_iso_frame)
 175         */
 176
 177         packets = period_frames * usb_frames / sample_rate + 1;
 178
 179         if (dev->speed == USB_SPEED_HIGH)
 180                 packets = (packets + 7) & ~7;
 181
 182         read_size += packets * USB_STREAM_URBDEPTH *
 183                 (max_packsize + sizeof(struct usb_stream_packet));
 184
 185         max_packsize = usb_maxpacket(dev, out_pipe, 1);
 186         write_size = max_packsize * packets * USB_STREAM_URBDEPTH;
 187
 188         if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) {
 189                 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n");
 190                 goto out;
 191         }
 192
 193         pg = get_order(read_size);
 194         sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO|
 195                                           __GFP_NOWARN, 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|
 216                                          __GFP_NOWARN, pg);
 217         if (!sk->write_page) {
 218                 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
 219                 usb_stream_free(sk);
 220                 return NULL;
 221         }
 222
 223         /* calculate the frequency in 16.16 format */
 224         if (dev->speed == USB_SPEED_FULL)
 225                 sk->freqn = get_usb_full_speed_rate(sample_rate);
 226         else
 227                 sk->freqn = get_usb_high_speed_rate(sample_rate);
 228
 229         init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
 230         sk->s->state = usb_stream_stopped;
 231 out:
 232         return sk->s;
 233 }
 234
 235
 236 /*                             start                                  */
 237
 238 static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb)
 239 {
 240         bool r;
 241         if (unlikely(urb->status)) {
 242                 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT)
 243                         snd_printk(KERN_WARNING "status=%i\n", urb->status);
 244                 sk->iso_frame_balance = 0x7FFFFFFF;
 245                 return false;
 246         }
 247         r = sk->iso_frame_balance == 0;
 248         if (!r)
 249                 sk->i_urb = urb;
 250         return r;
 251 }
 252
 253 static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb)
 254 {
 255         sk->iso_frame_balance += urb->number_of_packets;
 256         return balance_check(sk, urb);
 257 }
 258
 259 static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb)
 260 {
 261         sk->iso_frame_balance -= urb->number_of_packets;
 262         return balance_check(sk, urb);
 263 }
 264
 265 static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *))
 266 {
 267         int u;
 268
 269         for (u = 0; u < USB_STREAM_NURBS; u++) {
 270                 struct urb *urb = urbs[u];
 271                 urb->complete = complete;
 272         }
 273 }
 274
 275 static int usb_stream_prepare_playback(struct usb_stream_kernel *sk,
 276                 struct urb *inurb)
 277 {
 278         struct usb_stream *s = sk->s;
 279         struct urb *io;
 280         struct usb_iso_packet_descriptor *id, *od;
 281         int p = 0, lb = 0, l = 0;
 282
 283         io = sk->idle_outurb;
 284         od = io->iso_frame_desc;
 285
 286         for (; s->sync_packet < 0; ++p, ++s->sync_packet) {
 287                 struct urb *ii = sk->completed_inurb;
 288                 id = ii->iso_frame_desc +
 289                         ii->number_of_packets + s->sync_packet;
 290                 l = id->actual_length;
 291
 292                 od[p].length = l;
 293                 od[p].offset = lb;
 294                 lb += l;
 295         }
 296
 297         for (;
 298              s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps;
 299              ++p, ++s->sync_packet) {
 300                 l = inurb->iso_frame_desc[s->sync_packet].actual_length;
 301
 302                 if (s->idle_outsize + lb + l > s->period_size)
 303                         goto check_ok;
 304
 305                 od[p].length = l;
 306                 od[p].offset = lb;
 307                 lb += l;
 308         }
 309
 310 check_ok:
 311         s->sync_packet -= inurb->number_of_packets;
 312         if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) {
 313                 snd_printk(KERN_WARNING "invalid sync_packet = %i;"
 314                            " p=%i nop=%i %i %x %x %x > %x\n",
 315                            s->sync_packet, p, inurb->number_of_packets,
 316                            s->idle_outsize + lb + l,
 317                            s->idle_outsize, lb,  l,
 318                            s->period_size);
 319                 return -1;
 320         }
 321         if (unlikely(lb % s->cfg.frame_size)) {
 322                 snd_printk(KERN_WARNING"invalid outsize = %i\n",
 323                            lb);
 324                 return -1;
 325         }
 326         s->idle_outsize += lb - s->period_size;
 327         io->number_of_packets = p;
 328         io->transfer_buffer_length = lb;
 329         if (s->idle_outsize <= 0)
 330                 return 0;
 331
 332         snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize);
 333         return -1;
 334 }
 335
 336 static void prepare_inurb(int number_of_packets, struct urb *iu)
 337 {
 338         struct usb_iso_packet_descriptor *id;
 339         int p;
 340
 341         iu->number_of_packets = number_of_packets;
 342         id = iu->iso_frame_desc;
 343         id->offset = 0;
 344         for (p = 0; p < iu->number_of_packets - 1; ++p)
 345                 id[p + 1].offset = id[p].offset + id[p].length;
 346
 347         iu->transfer_buffer_length =
 348                 id[0].length * iu->number_of_packets;
 349 }
 350
 351 static int submit_urbs(struct usb_stream_kernel *sk,
 352                        struct urb *inurb, struct urb *outurb)
 353 {
 354         int err;
 355         prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
 356         err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
 357         if (err < 0)
 358                 goto report_failure;
 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                 goto report_failure;
 365
 366         sk->idle_outurb = sk->completed_outurb;
 367         sk->completed_outurb = outurb;
 368         return 0;
 369
 370 report_failure:
 371         snd_printk(KERN_ERR "%i\n", err);
 372         return err;
 373 }
 374
 375 #ifdef DEBUG_LOOP_BACK
 376 /*
 377   This loop_back() shows how to read/write the period data.
 378  */
 379 static void loop_back(struct usb_stream *s)
 380 {
 381         char *i, *o;
 382         int il, ol, l, p;
 383         struct urb *iu;
 384         struct usb_iso_packet_descriptor *id;
 385
 386         o = s->playback1st_to;
 387         ol = s->playback1st_size;
 388         l = 0;
 389
 390         if (s->insplit_pack >= 0) {
 391                 iu = sk->idle_inurb;
 392                 id = iu->iso_frame_desc;
 393                 p = s->insplit_pack;
 394         } else
 395                 goto second;
 396 loop:
 397         for (; p < iu->number_of_packets && l < s->period_size; ++p) {
 398                 i = iu->transfer_buffer + id[p].offset;
 399                 il = id[p].actual_length;
 400                 if (l + il > s->period_size)
 401                         il = s->period_size - l;
 402                 if (il <= ol) {
 403                         memcpy(o, i, il);
 404                         o += il;
 405                         ol -= il;
 406                 } else {
 407                         memcpy(o, i, ol);
 408                         singen_6pack(o, ol);
 409                         o = s->playback_to;
 410                         memcpy(o, i + ol, il - ol);
 411                         o += il - ol;
 412                         ol = s->period_size - s->playback1st_size;
 413                 }
 414                 l += il;
 415         }
 416         if (iu == sk->completed_inurb) {
 417                 if (l != s->period_size)
 418                         printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__,
 419                                l/(int)s->cfg.frame_size);
 420
 421                 return;
 422         }
 423 second:
 424         iu = sk->completed_inurb;
 425         id = iu->iso_frame_desc;
 426         p = 0;
 427         goto loop;
 428
 429 }
 430 #else
 431 static void loop_back(struct usb_stream *s)
 432 {
 433 }
 434 #endif
 435
 436 static void stream_idle(struct usb_stream_kernel *sk,
 437                         struct urb *inurb, struct urb *outurb)
 438 {
 439         struct usb_stream *s = sk->s;
 440         int l, p;
 441         int insize = s->idle_insize;
 442         int urb_size = 0;
 443
 444         s->inpacket_split = s->next_inpacket_split;
 445         s->inpacket_split_at = s->next_inpacket_split_at;
 446         s->next_inpacket_split = -1;
 447         s->next_inpacket_split_at = 0;
 448
 449         for (p = 0; p < inurb->number_of_packets; ++p) {
 450                 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc;
 451                 l = id[p].actual_length;
 452                 if (unlikely(l == 0 || id[p].status)) {
 453                         snd_printk(KERN_WARNING "underrun, status=%u\n",
 454                                    id[p].status);
 455                         goto err_out;
 456                 }
 457                 s->inpacket_head++;
 458                 s->inpacket_head %= s->inpackets;
 459                 if (s->inpacket_split == -1)
 460                         s->inpacket_split = s->inpacket_head;
 461
 462                 s->inpacket[s->inpacket_head].offset =
 463                         id[p].offset + (inurb->transfer_buffer - (void *)s);
 464                 s->inpacket[s->inpacket_head].length = l;
 465                 if (insize + l > s->period_size &&
 466                     s->next_inpacket_split == -1) {
 467                         s->next_inpacket_split = s->inpacket_head;
 468                         s->next_inpacket_split_at = s->period_size - insize;
 469                 }
 470                 insize += l;
 471                 urb_size += l;
 472         }
 473         s->idle_insize += urb_size - s->period_size;
 474         if (s->idle_insize < 0) {
 475                 snd_printk(KERN_WARNING "%i\n",
 476                            (s->idle_insize)/(int)s->cfg.frame_size);
 477                 goto err_out;
 478         }
 479         s->insize_done += urb_size;
 480
 481         l = s->idle_outsize;
 482         s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer -
 483                                   sk->write_page) - l;
 484
 485         if (usb_stream_prepare_playback(sk, inurb) < 0)
 486                 goto err_out;
 487
 488         s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l;
 489         s->outpacket[1].offset = sk->completed_outurb->transfer_buffer -
 490                 sk->write_page;
 491
 492         if (submit_urbs(sk, inurb, outurb) < 0)
 493                 goto err_out;
 494
 495         loop_back(s);
 496         s->periods_done++;
 497         wake_up_all(&sk->sleep);
 498         return;
 499 err_out:
 500         s->state = usb_stream_xrun;
 501         wake_up_all(&sk->sleep);
 502 }
 503
 504 static void i_capture_idle(struct urb *urb)
 505 {
 506         struct usb_stream_kernel *sk = urb->context;
 507         if (balance_capture(sk, urb))
 508                 stream_idle(sk, urb, sk->i_urb);
 509 }
 510
 511 static void i_playback_idle(struct urb *urb)
 512 {
 513         struct usb_stream_kernel *sk = urb->context;
 514         if (balance_playback(sk, urb))
 515                 stream_idle(sk, sk->i_urb, urb);
 516 }
 517
 518 static void stream_start(struct usb_stream_kernel *sk,
 519                          struct urb *inurb, struct urb *outurb)
 520 {
 521         struct usb_stream *s = sk->s;
 522         if (s->state >= usb_stream_sync1) {
 523                 int l, p, max_diff, max_diff_0;
 524                 int urb_size = 0;
 525                 unsigned frames_per_packet, min_frames = 0;
 526                 frames_per_packet = (s->period_size - s->idle_insize);
 527                 frames_per_packet <<= 8;
 528                 frames_per_packet /=
 529                         s->cfg.frame_size * inurb->number_of_packets;
 530                 frames_per_packet++;
 531
 532                 max_diff_0 = s->cfg.frame_size;
 533                 if (s->cfg.period_frames >= 256)
 534                         max_diff_0 <<= 1;
 535                 if (s->cfg.period_frames >= 1024)
 536                         max_diff_0 <<= 1;
 537                 max_diff = max_diff_0;
 538                 for (p = 0; p < inurb->number_of_packets; ++p) {
 539                         int diff;
 540                         l = inurb->iso_frame_desc[p].actual_length;
 541                         urb_size += l;
 542
 543                         min_frames += frames_per_packet;
 544                         diff = urb_size -
 545                                 (min_frames >> 8) * s->cfg.frame_size;
 546                         if (diff < max_diff) {
 547                                 snd_printdd(KERN_DEBUG "%i %i %i %i\n",
 548                                             s->insize_done,
 549                                             urb_size / (int)s->cfg.frame_size,
 550                                             inurb->number_of_packets, diff);
 551                                 max_diff = diff;
 552                         }
 553                 }
 554                 s->idle_insize -= max_diff - max_diff_0;
 555                 s->idle_insize += urb_size - s->period_size;
 556                 if (s->idle_insize < 0) {
 557                         snd_printk(KERN_WARNING "%i %i %i\n",
 558                                    s->idle_insize, urb_size, s->period_size);
 559                         return;
 560                 } else if (s->idle_insize == 0) {
 561                         s->next_inpacket_split =
 562                                 (s->inpacket_head + 1) % s->inpackets;
 563                         s->next_inpacket_split_at = 0;
 564                 } else {
 565                         unsigned split = s->inpacket_head;
 566                         l = s->idle_insize;
 567                         while (l > s->inpacket[split].length) {
 568                                 l -= s->inpacket[split].length;
 569                                 if (split == 0)
 570                                         split = s->inpackets - 1;
 571                                 else
 572                                         split--;
 573                         }
 574                         s->next_inpacket_split = split;
 575                         s->next_inpacket_split_at =
 576                                 s->inpacket[split].length - l;
 577                 }
 578
 579                 s->insize_done += urb_size;
 580
 581                 if (usb_stream_prepare_playback(sk, inurb) < 0)
 582                         return;
 583
 584         } else
 585                 playback_prep_freqn(sk, sk->idle_outurb);
 586
 587         if (submit_urbs(sk, inurb, outurb) < 0)
 588                 return;
 589
 590         if (s->state == usb_stream_sync1 && s->insize_done > 360000) {
 591                 /* just guesswork                            ^^^^^^ */
 592                 s->state = usb_stream_ready;
 593                 subs_set_complete(sk->inurb, i_capture_idle);
 594                 subs_set_complete(sk->outurb, i_playback_idle);
 595         }
 596 }
 597
 598 static void i_capture_start(struct urb *urb)
 599 {
 600         struct usb_iso_packet_descriptor *id = urb->iso_frame_desc;
 601         struct usb_stream_kernel *sk = urb->context;
 602         struct usb_stream *s = sk->s;
 603         int p;
 604         int empty = 0;
 605
 606         if (urb->status) {
 607                 snd_printk(KERN_WARNING "status=%i\n", urb->status);
 608                 return;
 609         }
 610
 611         for (p = 0; p < urb->number_of_packets; ++p) {
 612                 int l = id[p].actual_length;
 613                 if (l < s->cfg.frame_size) {
 614                         ++empty;
 615                         if (s->state >= usb_stream_sync0) {
 616                                 snd_printk(KERN_WARNING "%i\n", l);
 617                                 return;
 618                         }
 619                 }
 620                 s->inpacket_head++;
 621                 s->inpacket_head %= s->inpackets;
 622                 s->inpacket[s->inpacket_head].offset =
 623                         id[p].offset + (urb->transfer_buffer - (void *)s);
 624                 s->inpacket[s->inpacket_head].length = l;
 625         }
 626 #ifdef SHOW_EMPTY
 627         if (empty) {
 628                 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__,
 629                        urb->iso_frame_desc[0].actual_length);
 630                 for (pack = 1; pack < urb->number_of_packets; ++pack) {
 631                         int l = urb->iso_frame_desc[pack].actual_length;
 632                         printk(KERN_CONT " %i", l);
 633                 }
 634                 printk(KERN_CONT "\n");
 635         }
 636 #endif
 637         if (!empty && s->state < usb_stream_sync1)
 638                 ++s->state;
 639
 640         if (balance_capture(sk, urb))
 641                 stream_start(sk, urb, sk->i_urb);
 642 }
 643
 644 static void i_playback_start(struct urb *urb)
 645 {
 646         struct usb_stream_kernel *sk = urb->context;
 647         if (balance_playback(sk, urb))
 648                 stream_start(sk, sk->i_urb, urb);
 649 }
 650
 651 int usb_stream_start(struct usb_stream_kernel *sk)
 652 {
 653         struct usb_stream *s = sk->s;
 654         int frame = 0, iters = 0;
 655         int u, err;
 656         int try = 0;
 657
 658         if (s->state != usb_stream_stopped)
 659                 return -EAGAIN;
 660
 661         subs_set_complete(sk->inurb, i_capture_start);
 662         subs_set_complete(sk->outurb, i_playback_start);
 663         memset(sk->write_page, 0, s->write_size);
 664 dotry:
 665         s->insize_done = 0;
 666         s->idle_insize = 0;
 667         s->idle_outsize = 0;
 668         s->sync_packet = -1;
 669         s->inpacket_head = -1;
 670         sk->iso_frame_balance = 0;
 671         ++try;
 672         for (u = 0; u < 2; u++) {
 673                 struct urb *inurb = sk->inurb[u];
 674                 struct urb *outurb = sk->outurb[u];
 675                 playback_prep_freqn(sk, outurb);
 676                 inurb->number_of_packets = outurb->number_of_packets;
 677                 inurb->transfer_buffer_length =
 678                         inurb->number_of_packets *
 679                         inurb->iso_frame_desc[0].length;
 680
 681                 if (u == 0) {
 682                         int now;
 683                         struct usb_device *dev = inurb->dev;
 684                         frame = usb_get_current_frame_number(dev);
 685                         do {
 686                                 now = usb_get_current_frame_number(dev);
 687                                 ++iters;
 688                         } while (now > -1 && now == frame);
 689                 }
 690                 err = usb_submit_urb(inurb, GFP_ATOMIC);
 691                 if (err < 0) {
 692                         snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])"
 693                                    " returned %i\n", u, err);
 694                         return err;
 695                 }
 696                 err = usb_submit_urb(outurb, GFP_ATOMIC);
 697                 if (err < 0) {
 698                         snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])"
 699                                    " returned %i\n", u, err);
 700                         return err;
 701                 }
 702
 703                 if (inurb->start_frame != outurb->start_frame) {
 704                         snd_printd(KERN_DEBUG
 705                                    "u[%i] start_frames differ in:%u out:%u\n",
 706                                    u, inurb->start_frame, outurb->start_frame);
 707                         goto check_retry;
 708                 }
 709         }
 710         snd_printdd(KERN_DEBUG "%i %i\n", frame, iters);
 711         try = 0;
 712 check_retry:
 713         if (try) {
 714                 usb_stream_stop(sk);
 715                 if (try < 5) {
 716                         msleep(1500);
 717                         snd_printd(KERN_DEBUG "goto dotry;\n");
 718                         goto dotry;
 719                 }
 720                 snd_printk(KERN_WARNING"couldn't start"
 721                            " all urbs on the same start_frame.\n");
 722                 return -EFAULT;
 723         }
 724
 725         sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2];
 726         sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2];
 727         sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1];
 728         sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1];
 729
 730 /* wait, check */
 731         {
 732                 int wait_ms = 3000;
 733                 while (s->state != usb_stream_ready && wait_ms > 0) {
 734                         snd_printdd(KERN_DEBUG "%i\n", s->state);
 735                         msleep(200);
 736                         wait_ms -= 200;
 737                 }
 738         }
 739
 740         return s->state == usb_stream_ready ? 0 : -EFAULT;
 741 }
 742
 743
 744 /*                             stop                                   */
 745
 746 void usb_stream_stop(struct usb_stream_kernel *sk)
 747 {
 748         int u;
 749         if (!sk->s)
 750                 return;
 751         for (u = 0; u < USB_STREAM_NURBS; ++u) {
 752                 usb_kill_urb(sk->inurb[u]);
 753                 usb_kill_urb(sk->outurb[u]);
 754         }
 755         sk->s->state = usb_stream_stopped;
 756         msleep(400);
 757 }