sound/usb/caiaq/audio.c

   1 /*
   2  *   Copyright (c) 2006-2008 Daniel Mack, Karsten Wiese
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License 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
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17 */
  18
  19 #include <linux/spinlock.h>
  20 #include <linux/slab.h>
  21 #include <linux/init.h>
  22 #include <linux/usb.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25
  26 #include "device.h"
  27 #include "audio.h"
  28
  29 #define N_URBS                  32
  30 #define CLOCK_DRIFT_TOLERANCE   5
  31 #define FRAMES_PER_URB          8
  32 #define BYTES_PER_FRAME         512
  33 #define CHANNELS_PER_STREAM     2
  34 #define BYTES_PER_SAMPLE        3
  35 #define BYTES_PER_SAMPLE_USB    4
  36 #define MAX_BUFFER_SIZE         (128*1024)
  37 #define MAX_ENDPOINT_SIZE       512
  38
  39 #define ENDPOINT_CAPTURE        2
  40 #define ENDPOINT_PLAYBACK       6
  41
  42 #define MAKE_CHECKBYTE(dev,stream,i) \
  43         (stream << 1) | (~(i / (dev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)
  44
  45 static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {
  46         .info           = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
  47                            SNDRV_PCM_INFO_BLOCK_TRANSFER),
  48         .formats        = SNDRV_PCM_FMTBIT_S24_3BE,
  49         .rates          = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  50                            SNDRV_PCM_RATE_96000),
  51         .rate_min       = 44100,
  52         .rate_max       = 0, /* will overwrite later */
  53         .channels_min   = CHANNELS_PER_STREAM,
  54         .channels_max   = CHANNELS_PER_STREAM,
  55         .buffer_bytes_max = MAX_BUFFER_SIZE,
  56         .period_bytes_min = 128,
  57         .period_bytes_max = MAX_BUFFER_SIZE,
  58         .periods_min    = 1,
  59         .periods_max    = 1024,
  60 };
  61
  62 static void
  63 activate_substream(struct snd_usb_caiaqdev *dev,
  64                    struct snd_pcm_substream *sub)
  65 {
  66         spin_lock(&dev->spinlock);
  67
  68         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  69                 dev->sub_playback[sub->number] = sub;
  70         else
  71                 dev->sub_capture[sub->number] = sub;
  72
  73         spin_unlock(&dev->spinlock);
  74 }
  75
  76 static void
  77 deactivate_substream(struct snd_usb_caiaqdev *dev,
  78                      struct snd_pcm_substream *sub)
  79 {
  80         unsigned long flags;
  81         spin_lock_irqsave(&dev->spinlock, flags);
  82
  83         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  84                 dev->sub_playback[sub->number] = NULL;
  85         else
  86                 dev->sub_capture[sub->number] = NULL;
  87
  88         spin_unlock_irqrestore(&dev->spinlock, flags);
  89 }
  90
  91 static int
  92 all_substreams_zero(struct snd_pcm_substream **subs)
  93 {
  94         int i;
  95         for (i = 0; i < MAX_STREAMS; i++)
  96                 if (subs[i] != NULL)
  97                         return 0;
  98         return 1;
  99 }
 100
 101 static int stream_start(struct snd_usb_caiaqdev *dev)
 102 {
 103         int i, ret;
 104
 105         debug("%s(%p)\n", __func__, dev);
 106
 107         if (dev->streaming)
 108                 return -EINVAL;
 109
 110         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 111         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 112         dev->input_panic = 0;
 113         dev->output_panic = 0;
 114         dev->first_packet = 4;
 115         dev->streaming = 1;
 116         dev->warned = 0;
 117
 118         for (i = 0; i < N_URBS; i++) {
 119                 ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
 120                 if (ret) {
 121                         log("unable to trigger read #%d! (ret %d)\n", i, ret);
 122                         dev->streaming = 0;
 123                         return -EPIPE;
 124                 }
 125         }
 126
 127         return 0;
 128 }
 129
 130 static void stream_stop(struct snd_usb_caiaqdev *dev)
 131 {
 132         int i;
 133
 134         debug("%s(%p)\n", __func__, dev);
 135         if (!dev->streaming)
 136                 return;
 137
 138         dev->streaming = 0;
 139
 140         for (i = 0; i < N_URBS; i++) {
 141                 usb_kill_urb(dev->data_urbs_in[i]);
 142                 usb_kill_urb(dev->data_urbs_out[i]);
 143         }
 144 }
 145
 146 static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
 147 {
 148         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 149         debug("%s(%p)\n", __func__, substream);
 150         substream->runtime->hw = dev->pcm_info;
 151         snd_pcm_limit_hw_rates(substream->runtime);
 152         return 0;
 153 }
 154
 155 static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
 156 {
 157         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 158
 159         debug("%s(%p)\n", __func__, substream);
 160         if (all_substreams_zero(dev->sub_playback) &&
 161             all_substreams_zero(dev->sub_capture)) {
 162                 /* when the last client has stopped streaming,
 163                  * all sample rates are allowed again */
 164                 stream_stop(dev);
 165                 dev->pcm_info.rates = dev->samplerates;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
 172                                        struct snd_pcm_hw_params *hw_params)
 173 {
 174         debug("%s(%p)\n", __func__, sub);
 175         return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));
 176 }
 177
 178 static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
 179 {
 180         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 181         debug("%s(%p)\n", __func__, sub);
 182         deactivate_substream(dev, sub);
 183         return snd_pcm_lib_free_pages(sub);
 184 }
 185
 186 /* this should probably go upstream */
 187 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
 188 #error "Change this table"
 189 #endif
 190
 191 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 192                                 48000, 64000, 88200, 96000, 176400, 192000 };
 193
 194 static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
 195 {
 196         int bytes_per_sample, bpp, ret, i;
 197         int index = substream->number;
 198         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 199         struct snd_pcm_runtime *runtime = substream->runtime;
 200
 201         debug("%s(%p)\n", __func__, substream);
 202
 203         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 204                 int out_pos;
 205
 206                 switch (dev->spec.data_alignment) {
 207                 case 0:
 208                 case 2:
 209                         out_pos = BYTES_PER_SAMPLE + 1;
 210                         break;
 211                 case 3:
 212                 default:
 213                         out_pos = 0;
 214                         break;
 215                 }
 216
 217                 dev->period_out_count[index] = out_pos;
 218                 dev->audio_out_buf_pos[index] = out_pos;
 219         } else {
 220                 int in_pos;
 221
 222                 switch (dev->spec.data_alignment) {
 223                 case 0:
 224                         in_pos = BYTES_PER_SAMPLE + 2;
 225                         break;
 226                 case 2:
 227                         in_pos = BYTES_PER_SAMPLE;
 228                         break;
 229                 case 3:
 230                 default:
 231                         in_pos = 0;
 232                         break;
 233                 }
 234
 235                 dev->period_in_count[index] = in_pos;
 236                 dev->audio_in_buf_pos[index] = in_pos;
 237         }
 238
 239         if (dev->streaming)
 240                 return 0;
 241
 242         /* the first client that opens a stream defines the sample rate
 243          * setting for all subsequent calls, until the last client closed. */
 244         for (i=0; i < ARRAY_SIZE(rates); i++)
 245                 if (runtime->rate == rates[i])
 246                         dev->pcm_info.rates = 1 << i;
 247
 248         snd_pcm_limit_hw_rates(runtime);
 249
 250         bytes_per_sample = BYTES_PER_SAMPLE;
 251         if (dev->spec.data_alignment >= 2)
 252                 bytes_per_sample++;
 253
 254         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 255                 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
 256
 257         if (bpp > MAX_ENDPOINT_SIZE)
 258                 bpp = MAX_ENDPOINT_SIZE;
 259
 260         ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
 261                                              runtime->sample_bits, bpp);
 262         if (ret)
 263                 return ret;
 264
 265         ret = stream_start(dev);
 266         if (ret)
 267                 return ret;
 268
 269         dev->output_running = 0;
 270         wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
 271         if (!dev->output_running) {
 272                 stream_stop(dev);
 273                 return -EPIPE;
 274         }
 275
 276         return 0;
 277 }
 278
 279 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 280 {
 281         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 282
 283         debug("%s(%p) cmd %d\n", __func__, sub, cmd);
 284
 285         switch (cmd) {
 286         case SNDRV_PCM_TRIGGER_START:
 287         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 288                 activate_substream(dev, sub);
 289                 break;
 290         case SNDRV_PCM_TRIGGER_STOP:
 291         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 292                 deactivate_substream(dev, sub);
 293                 break;
 294         default:
 295                 return -EINVAL;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static snd_pcm_uframes_t
 302 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 303 {
 304         int index = sub->number;
 305         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 306         snd_pcm_uframes_t ptr;
 307
 308         spin_lock(&dev->spinlock);
 309
 310         if (dev->input_panic || dev->output_panic)
 311                 ptr = SNDRV_PCM_POS_XRUN;
 312
 313         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 314                 ptr = bytes_to_frames(sub->runtime,
 315                                         dev->audio_out_buf_pos[index]);
 316         else
 317                 ptr = bytes_to_frames(sub->runtime,
 318                                         dev->audio_in_buf_pos[index]);
 319
 320         spin_unlock(&dev->spinlock);
 321         return ptr;
 322 }
 323
 324 /* operators for both playback and capture */
 325 static struct snd_pcm_ops snd_usb_caiaq_ops = {
 326         .open =         snd_usb_caiaq_substream_open,
 327         .close =        snd_usb_caiaq_substream_close,
 328         .ioctl =        snd_pcm_lib_ioctl,
 329         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 330         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 331         .prepare =      snd_usb_caiaq_pcm_prepare,
 332         .trigger =      snd_usb_caiaq_pcm_trigger,
 333         .pointer =      snd_usb_caiaq_pcm_pointer
 334 };
 335
 336 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
 337                                       struct snd_pcm_substream **subs)
 338 {
 339         int stream, pb, *cnt;
 340         struct snd_pcm_substream *sub;
 341
 342         for (stream = 0; stream < dev->n_streams; stream++) {
 343                 sub = subs[stream];
 344                 if (!sub)
 345                         continue;
 346
 347                 pb = snd_pcm_lib_period_bytes(sub);
 348                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 349                                         &dev->period_out_count[stream] :
 350                                         &dev->period_in_count[stream];
 351
 352                 if (*cnt >= pb) {
 353                         snd_pcm_period_elapsed(sub);
 354                         *cnt %= pb;
 355                 }
 356         }
 357 }
 358
 359 static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
 360                               const struct urb *urb,
 361                               const struct usb_iso_packet_descriptor *iso)
 362 {
 363         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 364         struct snd_pcm_substream *sub;
 365         int stream, i;
 366
 367         if (all_substreams_zero(dev->sub_capture))
 368                 return;
 369
 370         for (i = 0; i < iso->actual_length;) {
 371                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 372                         sub = dev->sub_capture[stream];
 373                         if (sub) {
 374                                 struct snd_pcm_runtime *rt = sub->runtime;
 375                                 char *audio_buf = rt->dma_area;
 376                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 377                                 audio_buf[dev->audio_in_buf_pos[stream]++]
 378                                         = usb_buf[i];
 379                                 dev->period_in_count[stream]++;
 380                                 if (dev->audio_in_buf_pos[stream] == sz)
 381                                         dev->audio_in_buf_pos[stream] = 0;
 382                         }
 383                 }
 384         }
 385 }
 386
 387 static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
 388                               const struct urb *urb,
 389                               const struct usb_iso_packet_descriptor *iso)
 390 {
 391         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 392         unsigned char check_byte;
 393         struct snd_pcm_substream *sub;
 394         int stream, i;
 395
 396         for (i = 0; i < iso->actual_length;) {
 397                 if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 398                         for (stream = 0;
 399                              stream < dev->n_streams;
 400                              stream++, i++) {
 401                                 if (dev->first_packet)
 402                                         continue;
 403
 404                                 check_byte = MAKE_CHECKBYTE(dev, stream, i);
 405
 406                                 if ((usb_buf[i] & 0x3f) != check_byte)
 407                                         dev->input_panic = 1;
 408
 409                                 if (usb_buf[i] & 0x80)
 410                                         dev->output_panic = 1;
 411                         }
 412                 }
 413                 dev->first_packet = 0;
 414
 415                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 416                         sub = dev->sub_capture[stream];
 417                         if (dev->input_panic)
 418                                 usb_buf[i] = 0;
 419
 420                         if (sub) {
 421                                 struct snd_pcm_runtime *rt = sub->runtime;
 422                                 char *audio_buf = rt->dma_area;
 423                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 424                                 audio_buf[dev->audio_in_buf_pos[stream]++] =
 425                                         usb_buf[i];
 426                                 dev->period_in_count[stream]++;
 427                                 if (dev->audio_in_buf_pos[stream] == sz)
 428                                         dev->audio_in_buf_pos[stream] = 0;
 429                         }
 430                 }
 431         }
 432 }
 433
 434 static void read_in_urb_mode3(struct snd_usb_caiaqdev *dev,
 435                               const struct urb *urb,
 436                               const struct usb_iso_packet_descriptor *iso)
 437 {
 438         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 439         int stream, i;
 440
 441         /* paranoia check */
 442         if (iso->actual_length % (BYTES_PER_SAMPLE_USB * CHANNELS_PER_STREAM))
 443                 return;
 444
 445         for (i = 0; i < iso->actual_length;) {
 446                 for (stream = 0; stream < dev->n_streams; stream++) {
 447                         struct snd_pcm_substream *sub = dev->sub_capture[stream];
 448                         char *audio_buf = NULL;
 449                         int c, n, sz = 0;
 450
 451                         if (sub && !dev->input_panic) {
 452                                 struct snd_pcm_runtime *rt = sub->runtime;
 453                                 audio_buf = rt->dma_area;
 454                                 sz = frames_to_bytes(rt, rt->buffer_size);
 455                         }
 456
 457                         for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 458                                 /* 3 audio data bytes, followed by 1 check byte */
 459                                 if (audio_buf) {
 460                                         for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 461                                                 audio_buf[dev->audio_in_buf_pos[stream]++] = usb_buf[i+n];
 462
 463                                                 if (dev->audio_in_buf_pos[stream] == sz)
 464                                                         dev->audio_in_buf_pos[stream] = 0;
 465                                         }
 466
 467                                         dev->period_in_count[stream] += BYTES_PER_SAMPLE;
 468                                 }
 469
 470                                 i += BYTES_PER_SAMPLE;
 471
 472                                 if (usb_buf[i] != ((stream << 1) | c) &&
 473                                     !dev->first_packet) {
 474                                         if (!dev->input_panic)
 475                                                 printk(" EXPECTED: %02x got %02x, c %d, stream %d, i %d\n",
 476                                                         ((stream << 1) | c), usb_buf[i], c, stream, i);
 477                                         dev->input_panic = 1;
 478                                 }
 479
 480                                 i++;
 481                         }
 482                 }
 483         }
 484
 485         if (dev->first_packet > 0)
 486                 dev->first_packet--;
 487 }
 488
 489 static void read_in_urb(struct snd_usb_caiaqdev *dev,
 490                         const struct urb *urb,
 491                         const struct usb_iso_packet_descriptor *iso)
 492 {
 493         if (!dev->streaming)
 494                 return;
 495
 496         if (iso->actual_length < dev->bpp)
 497                 return;
 498
 499         switch (dev->spec.data_alignment) {
 500         case 0:
 501                 read_in_urb_mode0(dev, urb, iso);
 502                 break;
 503         case 2:
 504                 read_in_urb_mode2(dev, urb, iso);
 505                 break;
 506         case 3:
 507                 read_in_urb_mode3(dev, urb, iso);
 508                 break;
 509         }
 510
 511         if ((dev->input_panic || dev->output_panic) && !dev->warned) {
 512                 debug("streaming error detected %s %s\n",
 513                                 dev->input_panic ? "(input)" : "",
 514                                 dev->output_panic ? "(output)" : "");
 515                 dev->warned = 1;
 516         }
 517 }
 518
 519 static void fill_out_urb_mode_0(struct snd_usb_caiaqdev *dev,
 520                                 struct urb *urb,
 521                                 const struct usb_iso_packet_descriptor *iso)
 522 {
 523         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 524         struct snd_pcm_substream *sub;
 525         int stream, i;
 526
 527         for (i = 0; i < iso->length;) {
 528                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 529                         sub = dev->sub_playback[stream];
 530                         if (sub) {
 531                                 struct snd_pcm_runtime *rt = sub->runtime;
 532                                 char *audio_buf = rt->dma_area;
 533                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 534                                 usb_buf[i] =
 535                                         audio_buf[dev->audio_out_buf_pos[stream]];
 536                                 dev->period_out_count[stream]++;
 537                                 dev->audio_out_buf_pos[stream]++;
 538                                 if (dev->audio_out_buf_pos[stream] == sz)
 539                                         dev->audio_out_buf_pos[stream] = 0;
 540                         } else
 541                                 usb_buf[i] = 0;
 542                 }
 543
 544                 /* fill in the check bytes */
 545                 if (dev->spec.data_alignment == 2 &&
 546                     i % (dev->n_streams * BYTES_PER_SAMPLE_USB) ==
 547                         (dev->n_streams * CHANNELS_PER_STREAM))
 548                         for (stream = 0; stream < dev->n_streams; stream++, i++)
 549                                 usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
 550         }
 551 }
 552
 553 static void fill_out_urb_mode_3(struct snd_usb_caiaqdev *dev,
 554                                 struct urb *urb,
 555                                 const struct usb_iso_packet_descriptor *iso)
 556 {
 557         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 558         int stream, i;
 559
 560         for (i = 0; i < iso->length;) {
 561                 for (stream = 0; stream < dev->n_streams; stream++) {
 562                         struct snd_pcm_substream *sub = dev->sub_playback[stream];
 563                         char *audio_buf = NULL;
 564                         int c, n, sz = 0;
 565
 566                         if (sub) {
 567                                 struct snd_pcm_runtime *rt = sub->runtime;
 568                                 audio_buf = rt->dma_area;
 569                                 sz = frames_to_bytes(rt, rt->buffer_size);
 570                         }
 571
 572                         for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 573                                 for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 574                                         if (audio_buf) {
 575                                                 usb_buf[i+n] = audio_buf[dev->audio_out_buf_pos[stream]++];
 576
 577                                                 if (dev->audio_out_buf_pos[stream] == sz)
 578                                                         dev->audio_out_buf_pos[stream] = 0;
 579                                         } else {
 580                                                 usb_buf[i+n] = 0;
 581                                         }
 582                                 }
 583
 584                                 if (audio_buf)
 585                                         dev->period_out_count[stream] += BYTES_PER_SAMPLE;
 586
 587                                 i += BYTES_PER_SAMPLE;
 588
 589                                 /* fill in the check byte pattern */
 590                                 usb_buf[i++] = (stream << 1) | c;
 591                         }
 592                 }
 593         }
 594 }
 595
 596 static inline void fill_out_urb(struct snd_usb_caiaqdev *dev,
 597                                 struct urb *urb,
 598                                 const struct usb_iso_packet_descriptor *iso)
 599 {
 600         switch (dev->spec.data_alignment) {
 601         case 0:
 602         case 2:
 603                 fill_out_urb_mode_0(dev, urb, iso);
 604                 break;
 605         case 3:
 606                 fill_out_urb_mode_3(dev, urb, iso);
 607                 break;
 608         }
 609 }
 610
 611 static void read_completed(struct urb *urb)
 612 {
 613         struct snd_usb_caiaq_cb_info *info = urb->context;
 614         struct snd_usb_caiaqdev *dev;
 615         struct urb *out;
 616         int frame, len, send_it = 0, outframe = 0;
 617
 618         if (urb->status || !info)
 619                 return;
 620
 621         dev = info->dev;
 622
 623         if (!dev->streaming)
 624                 return;
 625
 626         out = dev->data_urbs_out[info->index];
 627
 628         /* read the recently received packet and send back one which has
 629          * the same layout */
 630         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 631                 if (urb->iso_frame_desc[frame].status)
 632                         continue;
 633
 634                 len = urb->iso_frame_desc[outframe].actual_length;
 635                 out->iso_frame_desc[outframe].length = len;
 636                 out->iso_frame_desc[outframe].actual_length = 0;
 637                 out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
 638
 639                 if (len > 0) {
 640                         spin_lock(&dev->spinlock);
 641                         fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
 642                         read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
 643                         spin_unlock(&dev->spinlock);
 644                         check_for_elapsed_periods(dev, dev->sub_playback);
 645                         check_for_elapsed_periods(dev, dev->sub_capture);
 646                         send_it = 1;
 647                 }
 648
 649                 outframe++;
 650         }
 651
 652         if (send_it) {
 653                 out->number_of_packets = FRAMES_PER_URB;
 654                 out->transfer_flags = URB_ISO_ASAP;
 655                 usb_submit_urb(out, GFP_ATOMIC);
 656         }
 657
 658         /* re-submit inbound urb */
 659         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 660                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 661                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 662                 urb->iso_frame_desc[frame].actual_length = 0;
 663         }
 664
 665         urb->number_of_packets = FRAMES_PER_URB;
 666         urb->transfer_flags = URB_ISO_ASAP;
 667         usb_submit_urb(urb, GFP_ATOMIC);
 668 }
 669
 670 static void write_completed(struct urb *urb)
 671 {
 672         struct snd_usb_caiaq_cb_info *info = urb->context;
 673         struct snd_usb_caiaqdev *dev = info->dev;
 674
 675         if (!dev->output_running) {
 676                 dev->output_running = 1;
 677                 wake_up(&dev->prepare_wait_queue);
 678         }
 679 }
 680
 681 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
 682 {
 683         int i, frame;
 684         struct urb **urbs;
 685         struct usb_device *usb_dev = dev->chip.dev;
 686         unsigned int pipe;
 687
 688         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 689                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 690                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 691
 692         urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
 693         if (!urbs) {
 694                 log("unable to kmalloc() urbs, OOM!?\n");
 695                 *ret = -ENOMEM;
 696                 return NULL;
 697         }
 698
 699         for (i = 0; i < N_URBS; i++) {
 700                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 701                 if (!urbs[i]) {
 702                         log("unable to usb_alloc_urb(), OOM!?\n");
 703                         *ret = -ENOMEM;
 704                         return urbs;
 705                 }
 706
 707                 urbs[i]->transfer_buffer =
 708                         kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
 709                 if (!urbs[i]->transfer_buffer) {
 710                         log("unable to kmalloc() transfer buffer, OOM!?\n");
 711                         *ret = -ENOMEM;
 712                         return urbs;
 713                 }
 714
 715                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 716                         struct usb_iso_packet_descriptor *iso =
 717                                 &urbs[i]->iso_frame_desc[frame];
 718
 719                         iso->offset = BYTES_PER_FRAME * frame;
 720                         iso->length = BYTES_PER_FRAME;
 721                 }
 722
 723                 urbs[i]->dev = usb_dev;
 724                 urbs[i]->pipe = pipe;
 725                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 726                                                 * BYTES_PER_FRAME;
 727                 urbs[i]->context = &dev->data_cb_info[i];
 728                 urbs[i]->interval = 1;
 729                 urbs[i]->transfer_flags = URB_ISO_ASAP;
 730                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 731                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 732                                         read_completed : write_completed;
 733         }
 734
 735         *ret = 0;
 736         return urbs;
 737 }
 738
 739 static void free_urbs(struct urb **urbs)
 740 {
 741         int i;
 742
 743         if (!urbs)
 744                 return;
 745
 746         for (i = 0; i < N_URBS; i++) {
 747                 if (!urbs[i])
 748                         continue;
 749
 750                 usb_kill_urb(urbs[i]);
 751                 kfree(urbs[i]->transfer_buffer);
 752                 usb_free_urb(urbs[i]);
 753         }
 754
 755         kfree(urbs);
 756 }
 757
 758 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
 759 {
 760         int i, ret;
 761
 762         dev->n_audio_in  = max(dev->spec.num_analog_audio_in,
 763                                dev->spec.num_digital_audio_in) /
 764                                 CHANNELS_PER_STREAM;
 765         dev->n_audio_out = max(dev->spec.num_analog_audio_out,
 766                                dev->spec.num_digital_audio_out) /
 767                                 CHANNELS_PER_STREAM;
 768         dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);
 769
 770         debug("dev->n_audio_in = %d\n", dev->n_audio_in);
 771         debug("dev->n_audio_out = %d\n", dev->n_audio_out);
 772         debug("dev->n_streams = %d\n", dev->n_streams);
 773
 774         if (dev->n_streams > MAX_STREAMS) {
 775                 log("unable to initialize device, too many streams.\n");
 776                 return -EINVAL;
 777         }
 778
 779         ret = snd_pcm_new(dev->chip.card, dev->product_name, 0,
 780                         dev->n_audio_out, dev->n_audio_in, &dev->pcm);
 781
 782         if (ret < 0) {
 783                 log("snd_pcm_new() returned %d\n", ret);
 784                 return ret;
 785         }
 786
 787         dev->pcm->private_data = dev;
 788         strlcpy(dev->pcm->name, dev->product_name, sizeof(dev->pcm->name));
 789
 790         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 791         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 792
 793         memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 794                         sizeof(snd_usb_caiaq_pcm_hardware));
 795
 796         /* setup samplerates */
 797         dev->samplerates = dev->pcm_info.rates;
 798         switch (dev->chip.usb_id) {
 799         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 800         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 801         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 802         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 803                 dev->samplerates |= SNDRV_PCM_RATE_192000;
 804                 /* fall thru */
 805         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO2DJ):
 806         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 807         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 808         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORAUDIO2):
 809                 dev->samplerates |= SNDRV_PCM_RATE_88200;
 810                 break;
 811         }
 812
 813         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 814                                 &snd_usb_caiaq_ops);
 815         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 816                                 &snd_usb_caiaq_ops);
 817
 818         snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
 819                                         SNDRV_DMA_TYPE_CONTINUOUS,
 820                                         snd_dma_continuous_data(GFP_KERNEL),
 821                                         MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
 822
 823         dev->data_cb_info =
 824                 kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS,
 825                                         GFP_KERNEL);
 826
 827         if (!dev->data_cb_info)
 828                 return -ENOMEM;
 829
 830         for (i = 0; i < N_URBS; i++) {
 831                 dev->data_cb_info[i].dev = dev;
 832                 dev->data_cb_info[i].index = i;
 833         }
 834
 835         dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 836         if (ret < 0) {
 837                 kfree(dev->data_cb_info);
 838                 free_urbs(dev->data_urbs_in);
 839                 return ret;
 840         }
 841
 842         dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 843         if (ret < 0) {
 844                 kfree(dev->data_cb_info);
 845                 free_urbs(dev->data_urbs_in);
 846                 free_urbs(dev->data_urbs_out);
 847                 return ret;
 848         }
 849
 850         return 0;
 851 }
 852
 853 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
 854 {
 855         debug("%s(%p)\n", __func__, dev);
 856         stream_stop(dev);
 857         free_urbs(dev->data_urbs_in);
 858         free_urbs(dev->data_urbs_out);
 859         kfree(dev->data_cb_info);
 860 }
 861