git.oblomov.eu Git - 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/init.h>
  21 #include <linux/usb.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24
  25 #include "device.h"
  26 #include "audio.h"
  27
  28 #define N_URBS                  32
  29 #define CLOCK_DRIFT_TOLERANCE   5
  30 #define FRAMES_PER_URB          8
  31 #define BYTES_PER_FRAME         512
  32 #define CHANNELS_PER_STREAM     2
  33 #define BYTES_PER_SAMPLE        3
  34 #define BYTES_PER_SAMPLE_USB    4
  35 #define MAX_BUFFER_SIZE         (128*1024)
  36 #define MAX_ENDPOINT_SIZE       512
  37
  38 #define ENDPOINT_CAPTURE        2
  39 #define ENDPOINT_PLAYBACK       6
  40
  41 #define MAKE_CHECKBYTE(dev,stream,i) \
  42         (stream << 1) | (~(i / (dev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)
  43
  44 static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {
  45         .info           = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
  46                            SNDRV_PCM_INFO_BLOCK_TRANSFER),
  47         .formats        = SNDRV_PCM_FMTBIT_S24_3BE,
  48         .rates          = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  49                            SNDRV_PCM_RATE_96000),
  50         .rate_min       = 44100,
  51         .rate_max       = 0, /* will overwrite later */
  52         .channels_min   = CHANNELS_PER_STREAM,
  53         .channels_max   = CHANNELS_PER_STREAM,
  54         .buffer_bytes_max = MAX_BUFFER_SIZE,
  55         .period_bytes_min = 128,
  56         .period_bytes_max = MAX_BUFFER_SIZE,
  57         .periods_min    = 1,
  58         .periods_max    = 1024,
  59 };
  60
  61 static void
  62 activate_substream(struct snd_usb_caiaqdev *dev,
  63                    struct snd_pcm_substream *sub)
  64 {
  65         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  66                 dev->sub_playback[sub->number] = sub;
  67         else
  68                 dev->sub_capture[sub->number] = sub;
  69 }
  70
  71 static void
  72 deactivate_substream(struct snd_usb_caiaqdev *dev,
  73                      struct snd_pcm_substream *sub)
  74 {
  75         unsigned long flags;
  76         spin_lock_irqsave(&dev->spinlock, flags);
  77
  78         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  79                 dev->sub_playback[sub->number] = NULL;
  80         else
  81                 dev->sub_capture[sub->number] = NULL;
  82
  83         spin_unlock_irqrestore(&dev->spinlock, flags);
  84 }
  85
  86 static int
  87 all_substreams_zero(struct snd_pcm_substream **subs)
  88 {
  89         int i;
  90         for (i = 0; i < MAX_STREAMS; i++)
  91                 if (subs[i] != NULL)
  92                         return 0;
  93         return 1;
  94 }
  95
  96 static int stream_start(struct snd_usb_caiaqdev *dev)
  97 {
  98         int i, ret;
  99
 100         debug("%s(%p)\n", __func__, dev);
 101
 102         if (dev->streaming)
 103                 return -EINVAL;
 104
 105         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 106         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 107         dev->input_panic = 0;
 108         dev->output_panic = 0;
 109         dev->first_packet = 1;
 110         dev->streaming = 1;
 111         dev->warned = 0;
 112
 113         for (i = 0; i < N_URBS; i++) {
 114                 ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
 115                 if (ret) {
 116                         log("unable to trigger read #%d! (ret %d)\n", i, ret);
 117                         dev->streaming = 0;
 118                         return -EPIPE;
 119                 }
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void stream_stop(struct snd_usb_caiaqdev *dev)
 126 {
 127         int i;
 128
 129         debug("%s(%p)\n", __func__, dev);
 130         if (!dev->streaming)
 131                 return;
 132
 133         dev->streaming = 0;
 134
 135         for (i = 0; i < N_URBS; i++) {
 136                 usb_kill_urb(dev->data_urbs_in[i]);
 137                 usb_kill_urb(dev->data_urbs_out[i]);
 138         }
 139 }
 140
 141 static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 144         debug("%s(%p)\n", __func__, substream);
 145         substream->runtime->hw = dev->pcm_info;
 146         snd_pcm_limit_hw_rates(substream->runtime);
 147         return 0;
 148 }
 149
 150 static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
 151 {
 152         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 153
 154         debug("%s(%p)\n", __func__, substream);
 155         if (all_substreams_zero(dev->sub_playback) &&
 156             all_substreams_zero(dev->sub_capture)) {
 157                 /* when the last client has stopped streaming,
 158                  * all sample rates are allowed again */
 159                 stream_stop(dev);
 160                 dev->pcm_info.rates = dev->samplerates;
 161         }
 162
 163         return 0;
 164 }
 165
 166 static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
 167                                         struct snd_pcm_hw_params *hw_params)
 168 {
 169         debug("%s(%p)\n", __func__, sub);
 170         return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));
 171 }
 172
 173 static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
 174 {
 175         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 176         debug("%s(%p)\n", __func__, sub);
 177         deactivate_substream(dev, sub);
 178         return snd_pcm_lib_free_pages(sub);
 179 }
 180
 181 /* this should probably go upstream */
 182 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
 183 #error "Change this table"
 184 #endif
 185
 186 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 187                                  48000, 64000, 88200, 96000, 176400, 192000 };
 188
 189 static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
 190 {
 191         int bytes_per_sample, bpp, ret, i;
 192         int index = substream->number;
 193         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 194         struct snd_pcm_runtime *runtime = substream->runtime;
 195
 196         debug("%s(%p)\n", __func__, substream);
 197
 198         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 199                 dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
 200         else
 201                 dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE;
 202
 203         if (dev->streaming)
 204                 return 0;
 205
 206         /* the first client that opens a stream defines the sample rate
 207          * setting for all subsequent calls, until the last client closed. */
 208         for (i=0; i < ARRAY_SIZE(rates); i++)
 209                 if (runtime->rate == rates[i])
 210                         dev->pcm_info.rates = 1 << i;
 211
 212         snd_pcm_limit_hw_rates(runtime);
 213
 214         bytes_per_sample = BYTES_PER_SAMPLE;
 215         if (dev->spec.data_alignment == 2)
 216                 bytes_per_sample++;
 217
 218         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 219                 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
 220
 221         if (bpp > MAX_ENDPOINT_SIZE)
 222                 bpp = MAX_ENDPOINT_SIZE;
 223
 224         ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
 225                                              runtime->sample_bits, bpp);
 226         if (ret)
 227                 return ret;
 228
 229         ret = stream_start(dev);
 230         if (ret)
 231                 return ret;
 232
 233         dev->output_running = 0;
 234         wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
 235         if (!dev->output_running) {
 236                 stream_stop(dev);
 237                 return -EPIPE;
 238         }
 239
 240         return 0;
 241 }
 242
 243 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 244 {
 245         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 246
 247         switch (cmd) {
 248         case SNDRV_PCM_TRIGGER_START:
 249         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 250                 activate_substream(dev, sub);
 251                 break;
 252         case SNDRV_PCM_TRIGGER_STOP:
 253         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 254                 deactivate_substream(dev, sub);
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static snd_pcm_uframes_t
 264 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 265 {
 266         int index = sub->number;
 267         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 268
 269         if (dev->input_panic || dev->output_panic)
 270                 return SNDRV_PCM_POS_XRUN;
 271
 272         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 273                 return bytes_to_frames(sub->runtime,
 274                                         dev->audio_out_buf_pos[index]);
 275         else
 276                 return bytes_to_frames(sub->runtime,
 277                                         dev->audio_in_buf_pos[index]);
 278 }
 279
 280 /* operators for both playback and capture */
 281 static struct snd_pcm_ops snd_usb_caiaq_ops = {
 282         .open =         snd_usb_caiaq_substream_open,
 283         .close =        snd_usb_caiaq_substream_close,
 284         .ioctl =        snd_pcm_lib_ioctl,
 285         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 286         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 287         .prepare =      snd_usb_caiaq_pcm_prepare,
 288         .trigger =      snd_usb_caiaq_pcm_trigger,
 289         .pointer =      snd_usb_caiaq_pcm_pointer
 290 };
 291
 292 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
 293                                       struct snd_pcm_substream **subs)
 294 {
 295         int stream, pb, *cnt;
 296         struct snd_pcm_substream *sub;
 297
 298         for (stream = 0; stream < dev->n_streams; stream++) {
 299                 sub = subs[stream];
 300                 if (!sub)
 301                         continue;
 302
 303                 pb = frames_to_bytes(sub->runtime,
 304                                      sub->runtime->period_size);
 305                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 306                                         &dev->period_out_count[stream] :
 307                                         &dev->period_in_count[stream];
 308
 309                 if (*cnt >= pb) {
 310                         snd_pcm_period_elapsed(sub);
 311                         *cnt %= pb;
 312                 }
 313         }
 314 }
 315
 316 static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
 317                               const struct urb *urb,
 318                               const struct usb_iso_packet_descriptor *iso)
 319 {
 320         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 321         struct snd_pcm_substream *sub;
 322         int stream, i;
 323
 324         if (all_substreams_zero(dev->sub_capture))
 325                 return;
 326
 327         for (i = 0; i < iso->actual_length;) {
 328                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 329                         sub = dev->sub_capture[stream];
 330                         if (sub) {
 331                                 struct snd_pcm_runtime *rt = sub->runtime;
 332                                 char *audio_buf = rt->dma_area;
 333                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 334                                 audio_buf[dev->audio_in_buf_pos[stream]++]
 335                                         = usb_buf[i];
 336                                 dev->period_in_count[stream]++;
 337                                 if (dev->audio_in_buf_pos[stream] == sz)
 338                                         dev->audio_in_buf_pos[stream] = 0;
 339                         }
 340                 }
 341         }
 342 }
 343
 344 static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
 345                               const struct urb *urb,
 346                               const struct usb_iso_packet_descriptor *iso)
 347 {
 348         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 349         unsigned char check_byte;
 350         struct snd_pcm_substream *sub;
 351         int stream, i;
 352
 353         for (i = 0; i < iso->actual_length;) {
 354                 if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 355                         for (stream = 0;
 356                              stream < dev->n_streams;
 357                              stream++, i++) {
 358                                 if (dev->first_packet)
 359                                         continue;
 360
 361                                 check_byte = MAKE_CHECKBYTE(dev, stream, i);
 362
 363                                 if ((usb_buf[i] & 0x3f) != check_byte)
 364                                         dev->input_panic = 1;
 365
 366                                 if (usb_buf[i] & 0x80)
 367                                         dev->output_panic = 1;
 368                         }
 369                 }
 370                 dev->first_packet = 0;
 371
 372                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 373                         sub = dev->sub_capture[stream];
 374                         if (dev->input_panic)
 375                                 usb_buf[i] = 0;
 376
 377                         if (sub) {
 378                                 struct snd_pcm_runtime *rt = sub->runtime;
 379                                 char *audio_buf = rt->dma_area;
 380                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 381                                 audio_buf[dev->audio_in_buf_pos[stream]++] =
 382                                         usb_buf[i];
 383                                 dev->period_in_count[stream]++;
 384                                 if (dev->audio_in_buf_pos[stream] == sz)
 385                                         dev->audio_in_buf_pos[stream] = 0;
 386                         }
 387                 }
 388         }
 389 }
 390
 391 static void read_in_urb(struct snd_usb_caiaqdev *dev,
 392                         const struct urb *urb,
 393                         const struct usb_iso_packet_descriptor *iso)
 394 {
 395         if (!dev->streaming)
 396                 return;
 397
 398         if (iso->actual_length < dev->bpp)
 399                 return;
 400
 401         switch (dev->spec.data_alignment) {
 402         case 0:
 403                 read_in_urb_mode0(dev, urb, iso);
 404                 break;
 405         case 2:
 406                 read_in_urb_mode2(dev, urb, iso);
 407                 break;
 408         }
 409
 410         if ((dev->input_panic || dev->output_panic) && !dev->warned) {
 411                 debug("streaming error detected %s %s\n",
 412                                 dev->input_panic ? "(input)" : "",
 413                                 dev->output_panic ? "(output)" : "");
 414                 dev->warned = 1;
 415         }
 416 }
 417
 418 static void fill_out_urb(struct snd_usb_caiaqdev *dev,
 419                          struct urb *urb,
 420                          const struct usb_iso_packet_descriptor *iso)
 421 {
 422         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 423         struct snd_pcm_substream *sub;
 424         int stream, i;
 425
 426         for (i = 0; i < iso->length;) {
 427                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 428                         sub = dev->sub_playback[stream];
 429                         if (sub) {
 430                                 struct snd_pcm_runtime *rt = sub->runtime;
 431                                 char *audio_buf = rt->dma_area;
 432                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 433                                 usb_buf[i] =
 434                                         audio_buf[dev->audio_out_buf_pos[stream]];
 435                                 dev->period_out_count[stream]++;
 436                                 dev->audio_out_buf_pos[stream]++;
 437                                 if (dev->audio_out_buf_pos[stream] == sz)
 438                                         dev->audio_out_buf_pos[stream] = 0;
 439                         } else
 440                                 usb_buf[i] = 0;
 441                 }
 442
 443                 /* fill in the check bytes */
 444                 if (dev->spec.data_alignment == 2 &&
 445                     i % (dev->n_streams * BYTES_PER_SAMPLE_USB) ==
 446                         (dev->n_streams * CHANNELS_PER_STREAM))
 447                     for (stream = 0; stream < dev->n_streams; stream++, i++)
 448                         usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
 449         }
 450 }
 451
 452 static void read_completed(struct urb *urb)
 453 {
 454         struct snd_usb_caiaq_cb_info *info = urb->context;
 455         struct snd_usb_caiaqdev *dev;
 456         struct urb *out;
 457         int frame, len, send_it = 0, outframe = 0;
 458
 459         if (urb->status || !info)
 460                 return;
 461
 462         dev = info->dev;
 463
 464         if (!dev->streaming)
 465                 return;
 466
 467         out = dev->data_urbs_out[info->index];
 468
 469         /* read the recently received packet and send back one which has
 470          * the same layout */
 471         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 472                 if (urb->iso_frame_desc[frame].status)
 473                         continue;
 474
 475                 len = urb->iso_frame_desc[outframe].actual_length;
 476                 out->iso_frame_desc[outframe].length = len;
 477                 out->iso_frame_desc[outframe].actual_length = 0;
 478                 out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
 479
 480                 if (len > 0) {
 481                         spin_lock(&dev->spinlock);
 482                         fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
 483                         read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
 484                         spin_unlock(&dev->spinlock);
 485                         check_for_elapsed_periods(dev, dev->sub_playback);
 486                         check_for_elapsed_periods(dev, dev->sub_capture);
 487                         send_it = 1;
 488                 }
 489
 490                 outframe++;
 491         }
 492
 493         if (send_it) {
 494                 out->number_of_packets = FRAMES_PER_URB;
 495                 out->transfer_flags = URB_ISO_ASAP;
 496                 usb_submit_urb(out, GFP_ATOMIC);
 497         }
 498
 499         /* re-submit inbound urb */
 500         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 501                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 502                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 503                 urb->iso_frame_desc[frame].actual_length = 0;
 504         }
 505
 506         urb->number_of_packets = FRAMES_PER_URB;
 507         urb->transfer_flags = URB_ISO_ASAP;
 508         usb_submit_urb(urb, GFP_ATOMIC);
 509 }
 510
 511 static void write_completed(struct urb *urb)
 512 {
 513         struct snd_usb_caiaq_cb_info *info = urb->context;
 514         struct snd_usb_caiaqdev *dev = info->dev;
 515
 516         if (!dev->output_running) {
 517                 dev->output_running = 1;
 518                 wake_up(&dev->prepare_wait_queue);
 519         }
 520 }
 521
 522 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
 523 {
 524         int i, frame;
 525         struct urb **urbs;
 526         struct usb_device *usb_dev = dev->chip.dev;
 527         unsigned int pipe;
 528
 529         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 530                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 531                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 532
 533         urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
 534         if (!urbs) {
 535                 log("unable to kmalloc() urbs, OOM!?\n");
 536                 *ret = -ENOMEM;
 537                 return NULL;
 538         }
 539
 540         for (i = 0; i < N_URBS; i++) {
 541                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 542                 if (!urbs[i]) {
 543                         log("unable to usb_alloc_urb(), OOM!?\n");
 544                         *ret = -ENOMEM;
 545                         return urbs;
 546                 }
 547
 548                 urbs[i]->transfer_buffer =
 549                         kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
 550                 if (!urbs[i]->transfer_buffer) {
 551                         log("unable to kmalloc() transfer buffer, OOM!?\n");
 552                         *ret = -ENOMEM;
 553                         return urbs;
 554                 }
 555
 556                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 557                         struct usb_iso_packet_descriptor *iso =
 558                                 &urbs[i]->iso_frame_desc[frame];
 559
 560                         iso->offset = BYTES_PER_FRAME * frame;
 561                         iso->length = BYTES_PER_FRAME;
 562                 }
 563
 564                 urbs[i]->dev = usb_dev;
 565                 urbs[i]->pipe = pipe;
 566                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 567                                                 * BYTES_PER_FRAME;
 568                 urbs[i]->context = &dev->data_cb_info[i];
 569                 urbs[i]->interval = 1;
 570                 urbs[i]->transfer_flags = URB_ISO_ASAP;
 571                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 572                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 573                                         read_completed : write_completed;
 574         }
 575
 576         *ret = 0;
 577         return urbs;
 578 }
 579
 580 static void free_urbs(struct urb **urbs)
 581 {
 582         int i;
 583
 584         if (!urbs)
 585                 return;
 586
 587         for (i = 0; i < N_URBS; i++) {
 588                 if (!urbs[i])
 589                         continue;
 590
 591                 usb_kill_urb(urbs[i]);
 592                 kfree(urbs[i]->transfer_buffer);
 593                 usb_free_urb(urbs[i]);
 594         }
 595
 596         kfree(urbs);
 597 }
 598
 599 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
 600 {
 601         int i, ret;
 602
 603         dev->n_audio_in  = max(dev->spec.num_analog_audio_in,
 604                                dev->spec.num_digital_audio_in) /
 605                                 CHANNELS_PER_STREAM;
 606         dev->n_audio_out = max(dev->spec.num_analog_audio_out,
 607                                dev->spec.num_digital_audio_out) /
 608                                 CHANNELS_PER_STREAM;
 609         dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);
 610
 611         debug("dev->n_audio_in = %d\n", dev->n_audio_in);
 612         debug("dev->n_audio_out = %d\n", dev->n_audio_out);
 613         debug("dev->n_streams = %d\n", dev->n_streams);
 614
 615         if (dev->n_streams > MAX_STREAMS) {
 616                 log("unable to initialize device, too many streams.\n");
 617                 return -EINVAL;
 618         }
 619
 620         ret = snd_pcm_new(dev->chip.card, dev->product_name, 0,
 621                         dev->n_audio_out, dev->n_audio_in, &dev->pcm);
 622
 623         if (ret < 0) {
 624                 log("snd_pcm_new() returned %d\n", ret);
 625                 return ret;
 626         }
 627
 628         dev->pcm->private_data = dev;
 629         strcpy(dev->pcm->name, dev->product_name);
 630
 631         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 632         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 633
 634         memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 635                         sizeof(snd_usb_caiaq_pcm_hardware));
 636
 637         /* setup samplerates */
 638         dev->samplerates = dev->pcm_info.rates;
 639         switch (dev->chip.usb_id) {
 640         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 641         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 642         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 643         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 644                 dev->samplerates |= SNDRV_PCM_RATE_192000;
 645                 /* fall thru */
 646         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 647         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 648                 dev->samplerates |= SNDRV_PCM_RATE_88200;
 649                 break;
 650         }
 651
 652         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 653                                 &snd_usb_caiaq_ops);
 654         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 655                                 &snd_usb_caiaq_ops);
 656
 657         snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
 658                                         SNDRV_DMA_TYPE_CONTINUOUS,
 659                                         snd_dma_continuous_data(GFP_KERNEL),
 660                                         MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
 661
 662         dev->data_cb_info =
 663                 kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS,
 664                                         GFP_KERNEL);
 665
 666         if (!dev->data_cb_info)
 667                 return -ENOMEM;
 668
 669         for (i = 0; i < N_URBS; i++) {
 670                 dev->data_cb_info[i].dev = dev;
 671                 dev->data_cb_info[i].index = i;
 672         }
 673
 674         dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 675         if (ret < 0) {
 676                 kfree(dev->data_cb_info);
 677                 free_urbs(dev->data_urbs_in);
 678                 return ret;
 679         }
 680
 681         dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 682         if (ret < 0) {
 683                 kfree(dev->data_cb_info);
 684                 free_urbs(dev->data_urbs_in);
 685                 free_urbs(dev->data_urbs_out);
 686                 return ret;
 687         }
 688
 689         return 0;
 690 }
 691
 692 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
 693 {
 694         debug("%s(%p)\n", __func__, dev);
 695         stream_stop(dev);
 696         free_urbs(dev->data_urbs_in);
 697         free_urbs(dev->data_urbs_out);
 698         kfree(dev->data_cb_info);
 699 }
 700