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