SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 = 1;
 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                 dev->period_out_count[index] = BYTES_PER_SAMPLE + 1;
 205                 dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
 206         } else {
 207                 int in_pos = (dev->spec.data_alignment == 2) ? 0 : 2;
 208                 dev->period_in_count[index] = BYTES_PER_SAMPLE + in_pos;
 209                 dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE + in_pos;
 210         }
 211
 212         if (dev->streaming)
 213                 return 0;
 214
 215         /* the first client that opens a stream defines the sample rate
 216          * setting for all subsequent calls, until the last client closed. */
 217         for (i=0; i < ARRAY_SIZE(rates); i++)
 218                 if (runtime->rate == rates[i])
 219                         dev->pcm_info.rates = 1 << i;
 220
 221         snd_pcm_limit_hw_rates(runtime);
 222
 223         bytes_per_sample = BYTES_PER_SAMPLE;
 224         if (dev->spec.data_alignment == 2)
 225                 bytes_per_sample++;
 226
 227         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 228                 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
 229
 230         if (bpp > MAX_ENDPOINT_SIZE)
 231                 bpp = MAX_ENDPOINT_SIZE;
 232
 233         ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
 234                                              runtime->sample_bits, bpp);
 235         if (ret)
 236                 return ret;
 237
 238         ret = stream_start(dev);
 239         if (ret)
 240                 return ret;
 241
 242         dev->output_running = 0;
 243         wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
 244         if (!dev->output_running) {
 245                 stream_stop(dev);
 246                 return -EPIPE;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 253 {
 254         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 255
 256         switch (cmd) {
 257         case SNDRV_PCM_TRIGGER_START:
 258         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 259                 activate_substream(dev, sub);
 260                 break;
 261         case SNDRV_PCM_TRIGGER_STOP:
 262         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 263                 deactivate_substream(dev, sub);
 264                 break;
 265         default:
 266                 return -EINVAL;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static snd_pcm_uframes_t
 273 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 274 {
 275         int index = sub->number;
 276         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 277         snd_pcm_uframes_t ptr;
 278
 279         spin_lock(&dev->spinlock);
 280
 281         if (dev->input_panic || dev->output_panic)
 282                 ptr = SNDRV_PCM_POS_XRUN;
 283
 284         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 285                 ptr = bytes_to_frames(sub->runtime,
 286                                         dev->audio_out_buf_pos[index]);
 287         else
 288                 ptr = bytes_to_frames(sub->runtime,
 289                                         dev->audio_in_buf_pos[index]);
 290
 291         spin_unlock(&dev->spinlock);
 292         return ptr;
 293 }
 294
 295 /* operators for both playback and capture */
 296 static struct snd_pcm_ops snd_usb_caiaq_ops = {
 297         .open =         snd_usb_caiaq_substream_open,
 298         .close =        snd_usb_caiaq_substream_close,
 299         .ioctl =        snd_pcm_lib_ioctl,
 300         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 301         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 302         .prepare =      snd_usb_caiaq_pcm_prepare,
 303         .trigger =      snd_usb_caiaq_pcm_trigger,
 304         .pointer =      snd_usb_caiaq_pcm_pointer
 305 };
 306
 307 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
 308                                       struct snd_pcm_substream **subs)
 309 {
 310         int stream, pb, *cnt;
 311         struct snd_pcm_substream *sub;
 312
 313         for (stream = 0; stream < dev->n_streams; stream++) {
 314                 sub = subs[stream];
 315                 if (!sub)
 316                         continue;
 317
 318                 pb = snd_pcm_lib_period_bytes(sub);
 319                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 320                                         &dev->period_out_count[stream] :
 321                                         &dev->period_in_count[stream];
 322
 323                 if (*cnt >= pb) {
 324                         snd_pcm_period_elapsed(sub);
 325                         *cnt %= pb;
 326                 }
 327         }
 328 }
 329
 330 static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
 331                               const struct urb *urb,
 332                               const struct usb_iso_packet_descriptor *iso)
 333 {
 334         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 335         struct snd_pcm_substream *sub;
 336         int stream, i;
 337
 338         if (all_substreams_zero(dev->sub_capture))
 339                 return;
 340
 341         for (i = 0; i < iso->actual_length;) {
 342                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 343                         sub = dev->sub_capture[stream];
 344                         if (sub) {
 345                                 struct snd_pcm_runtime *rt = sub->runtime;
 346                                 char *audio_buf = rt->dma_area;
 347                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 348                                 audio_buf[dev->audio_in_buf_pos[stream]++]
 349                                         = usb_buf[i];
 350                                 dev->period_in_count[stream]++;
 351                                 if (dev->audio_in_buf_pos[stream] == sz)
 352                                         dev->audio_in_buf_pos[stream] = 0;
 353                         }
 354                 }
 355         }
 356 }
 357
 358 static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
 359                               const struct urb *urb,
 360                               const struct usb_iso_packet_descriptor *iso)
 361 {
 362         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 363         unsigned char check_byte;
 364         struct snd_pcm_substream *sub;
 365         int stream, i;
 366
 367         for (i = 0; i < iso->actual_length;) {
 368                 if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 369                         for (stream = 0;
 370                              stream < dev->n_streams;
 371                              stream++, i++) {
 372                                 if (dev->first_packet)
 373                                         continue;
 374
 375                                 check_byte = MAKE_CHECKBYTE(dev, stream, i);
 376
 377                                 if ((usb_buf[i] & 0x3f) != check_byte)
 378                                         dev->input_panic = 1;
 379
 380                                 if (usb_buf[i] & 0x80)
 381                                         dev->output_panic = 1;
 382                         }
 383                 }
 384                 dev->first_packet = 0;
 385
 386                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 387                         sub = dev->sub_capture[stream];
 388                         if (dev->input_panic)
 389                                 usb_buf[i] = 0;
 390
 391                         if (sub) {
 392                                 struct snd_pcm_runtime *rt = sub->runtime;
 393                                 char *audio_buf = rt->dma_area;
 394                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 395                                 audio_buf[dev->audio_in_buf_pos[stream]++] =
 396                                         usb_buf[i];
 397                                 dev->period_in_count[stream]++;
 398                                 if (dev->audio_in_buf_pos[stream] == sz)
 399                                         dev->audio_in_buf_pos[stream] = 0;
 400                         }
 401                 }
 402         }
 403 }
 404
 405 static void read_in_urb(struct snd_usb_caiaqdev *dev,
 406                         const struct urb *urb,
 407                         const struct usb_iso_packet_descriptor *iso)
 408 {
 409         if (!dev->streaming)
 410                 return;
 411
 412         if (iso->actual_length < dev->bpp)
 413                 return;
 414
 415         switch (dev->spec.data_alignment) {
 416         case 0:
 417                 read_in_urb_mode0(dev, urb, iso);
 418                 break;
 419         case 2:
 420                 read_in_urb_mode2(dev, urb, iso);
 421                 break;
 422         }
 423
 424         if ((dev->input_panic || dev->output_panic) && !dev->warned) {
 425                 debug("streaming error detected %s %s\n",
 426                                 dev->input_panic ? "(input)" : "",
 427                                 dev->output_panic ? "(output)" : "");
 428                 dev->warned = 1;
 429         }
 430 }
 431
 432 static void fill_out_urb(struct snd_usb_caiaqdev *dev,
 433                          struct urb *urb,
 434                          const struct usb_iso_packet_descriptor *iso)
 435 {
 436         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 437         struct snd_pcm_substream *sub;
 438         int stream, i;
 439
 440         for (i = 0; i < iso->length;) {
 441                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 442                         sub = dev->sub_playback[stream];
 443                         if (sub) {
 444                                 struct snd_pcm_runtime *rt = sub->runtime;
 445                                 char *audio_buf = rt->dma_area;
 446                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 447                                 usb_buf[i] =
 448                                         audio_buf[dev->audio_out_buf_pos[stream]];
 449                                 dev->period_out_count[stream]++;
 450                                 dev->audio_out_buf_pos[stream]++;
 451                                 if (dev->audio_out_buf_pos[stream] == sz)
 452                                         dev->audio_out_buf_pos[stream] = 0;
 453                         } else
 454                                 usb_buf[i] = 0;
 455                 }
 456
 457                 /* fill in the check bytes */
 458                 if (dev->spec.data_alignment == 2 &&
 459                     i % (dev->n_streams * BYTES_PER_SAMPLE_USB) ==
 460                         (dev->n_streams * CHANNELS_PER_STREAM))
 461                     for (stream = 0; stream < dev->n_streams; stream++, i++)
 462                         usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
 463         }
 464 }
 465
 466 static void read_completed(struct urb *urb)
 467 {
 468         struct snd_usb_caiaq_cb_info *info = urb->context;
 469         struct snd_usb_caiaqdev *dev;
 470         struct urb *out;
 471         int frame, len, send_it = 0, outframe = 0;
 472
 473         if (urb->status || !info)
 474                 return;
 475
 476         dev = info->dev;
 477
 478         if (!dev->streaming)
 479                 return;
 480
 481         out = dev->data_urbs_out[info->index];
 482
 483         /* read the recently received packet and send back one which has
 484          * the same layout */
 485         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 486                 if (urb->iso_frame_desc[frame].status)
 487                         continue;
 488
 489                 len = urb->iso_frame_desc[outframe].actual_length;
 490                 out->iso_frame_desc[outframe].length = len;
 491                 out->iso_frame_desc[outframe].actual_length = 0;
 492                 out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
 493
 494                 if (len > 0) {
 495                         spin_lock(&dev->spinlock);
 496                         fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
 497                         read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
 498                         spin_unlock(&dev->spinlock);
 499                         check_for_elapsed_periods(dev, dev->sub_playback);
 500                         check_for_elapsed_periods(dev, dev->sub_capture);
 501                         send_it = 1;
 502                 }
 503
 504                 outframe++;
 505         }
 506
 507         if (send_it) {
 508                 out->number_of_packets = FRAMES_PER_URB;
 509                 out->transfer_flags = URB_ISO_ASAP;
 510                 usb_submit_urb(out, GFP_ATOMIC);
 511         }
 512
 513         /* re-submit inbound urb */
 514         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 515                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 516                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 517                 urb->iso_frame_desc[frame].actual_length = 0;
 518         }
 519
 520         urb->number_of_packets = FRAMES_PER_URB;
 521         urb->transfer_flags = URB_ISO_ASAP;
 522         usb_submit_urb(urb, GFP_ATOMIC);
 523 }
 524
 525 static void write_completed(struct urb *urb)
 526 {
 527         struct snd_usb_caiaq_cb_info *info = urb->context;
 528         struct snd_usb_caiaqdev *dev = info->dev;
 529
 530         if (!dev->output_running) {
 531                 dev->output_running = 1;
 532                 wake_up(&dev->prepare_wait_queue);
 533         }
 534 }
 535
 536 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
 537 {
 538         int i, frame;
 539         struct urb **urbs;
 540         struct usb_device *usb_dev = dev->chip.dev;
 541         unsigned int pipe;
 542
 543         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 544                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 545                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 546
 547         urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
 548         if (!urbs) {
 549                 log("unable to kmalloc() urbs, OOM!?\n");
 550                 *ret = -ENOMEM;
 551                 return NULL;
 552         }
 553
 554         for (i = 0; i < N_URBS; i++) {
 555                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 556                 if (!urbs[i]) {
 557                         log("unable to usb_alloc_urb(), OOM!?\n");
 558                         *ret = -ENOMEM;
 559                         return urbs;
 560                 }
 561
 562                 urbs[i]->transfer_buffer =
 563                         kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
 564                 if (!urbs[i]->transfer_buffer) {
 565                         log("unable to kmalloc() transfer buffer, OOM!?\n");
 566                         *ret = -ENOMEM;
 567                         return urbs;
 568                 }
 569
 570                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 571                         struct usb_iso_packet_descriptor *iso =
 572                                 &urbs[i]->iso_frame_desc[frame];
 573
 574                         iso->offset = BYTES_PER_FRAME * frame;
 575                         iso->length = BYTES_PER_FRAME;
 576                 }
 577
 578                 urbs[i]->dev = usb_dev;
 579                 urbs[i]->pipe = pipe;
 580                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 581                                                 * BYTES_PER_FRAME;
 582                 urbs[i]->context = &dev->data_cb_info[i];
 583                 urbs[i]->interval = 1;
 584                 urbs[i]->transfer_flags = URB_ISO_ASAP;
 585                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 586                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 587                                         read_completed : write_completed;
 588         }
 589
 590         *ret = 0;
 591         return urbs;
 592 }
 593
 594 static void free_urbs(struct urb **urbs)
 595 {
 596         int i;
 597
 598         if (!urbs)
 599                 return;
 600
 601         for (i = 0; i < N_URBS; i++) {
 602                 if (!urbs[i])
 603                         continue;
 604
 605                 usb_kill_urb(urbs[i]);
 606                 kfree(urbs[i]->transfer_buffer);
 607                 usb_free_urb(urbs[i]);
 608         }
 609
 610         kfree(urbs);
 611 }
 612
 613 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
 614 {
 615         int i, ret;
 616
 617         dev->n_audio_in  = max(dev->spec.num_analog_audio_in,
 618                                dev->spec.num_digital_audio_in) /
 619                                 CHANNELS_PER_STREAM;
 620         dev->n_audio_out = max(dev->spec.num_analog_audio_out,
 621                                dev->spec.num_digital_audio_out) /
 622                                 CHANNELS_PER_STREAM;
 623         dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);
 624
 625         debug("dev->n_audio_in = %d\n", dev->n_audio_in);
 626         debug("dev->n_audio_out = %d\n", dev->n_audio_out);
 627         debug("dev->n_streams = %d\n", dev->n_streams);
 628
 629         if (dev->n_streams > MAX_STREAMS) {
 630                 log("unable to initialize device, too many streams.\n");
 631                 return -EINVAL;
 632         }
 633
 634         ret = snd_pcm_new(dev->chip.card, dev->product_name, 0,
 635                         dev->n_audio_out, dev->n_audio_in, &dev->pcm);
 636
 637         if (ret < 0) {
 638                 log("snd_pcm_new() returned %d\n", ret);
 639                 return ret;
 640         }
 641
 642         dev->pcm->private_data = dev;
 643         strcpy(dev->pcm->name, dev->product_name);
 644
 645         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 646         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 647
 648         memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 649                         sizeof(snd_usb_caiaq_pcm_hardware));
 650
 651         /* setup samplerates */
 652         dev->samplerates = dev->pcm_info.rates;
 653         switch (dev->chip.usb_id) {
 654         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 655         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 656         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 657         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 658                 dev->samplerates |= SNDRV_PCM_RATE_192000;
 659                 /* fall thru */
 660         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO2DJ):
 661         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 662         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 663                 dev->samplerates |= SNDRV_PCM_RATE_88200;
 664                 break;
 665         }
 666
 667         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 668                                 &snd_usb_caiaq_ops);
 669         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 670                                 &snd_usb_caiaq_ops);
 671
 672         snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
 673                                         SNDRV_DMA_TYPE_CONTINUOUS,
 674                                         snd_dma_continuous_data(GFP_KERNEL),
 675                                         MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
 676
 677         dev->data_cb_info =
 678                 kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS,
 679                                         GFP_KERNEL);
 680
 681         if (!dev->data_cb_info)
 682                 return -ENOMEM;
 683
 684         for (i = 0; i < N_URBS; i++) {
 685                 dev->data_cb_info[i].dev = dev;
 686                 dev->data_cb_info[i].index = i;
 687         }
 688
 689         dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 690         if (ret < 0) {
 691                 kfree(dev->data_cb_info);
 692                 free_urbs(dev->data_urbs_in);
 693                 return ret;
 694         }
 695
 696         dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 697         if (ret < 0) {
 698                 kfree(dev->data_cb_info);
 699                 free_urbs(dev->data_urbs_in);
 700                 free_urbs(dev->data_urbs_out);
 701                 return ret;
 702         }
 703
 704         return 0;
 705 }
 706
 707 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
 708 {
 709         debug("%s(%p)\n", __func__, dev);
 710         stream_stop(dev);
 711         free_urbs(dev->data_urbs_in);
 712         free_urbs(dev->data_urbs_out);
 713         kfree(dev->data_cb_info);
 714 }
 715