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