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->period_out_count[index] = BYTES_PER_SAMPLE + 1;
 200                 dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
 201         } else {
 202                 dev->period_in_count[index] = BYTES_PER_SAMPLE;
 203                 dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE;
 204         }
 205
 206         if (dev->streaming)
 207                 return 0;
 208
 209         /* the first client that opens a stream defines the sample rate
 210          * setting for all subsequent calls, until the last client closed. */
 211         for (i=0; i < ARRAY_SIZE(rates); i++)
 212                 if (runtime->rate == rates[i])
 213                         dev->pcm_info.rates = 1 << i;
 214
 215         snd_pcm_limit_hw_rates(runtime);
 216
 217         bytes_per_sample = BYTES_PER_SAMPLE;
 218         if (dev->spec.data_alignment == 2)
 219                 bytes_per_sample++;
 220
 221         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 222                 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
 223
 224         if (bpp > MAX_ENDPOINT_SIZE)
 225                 bpp = MAX_ENDPOINT_SIZE;
 226
 227         ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
 228                                              runtime->sample_bits, bpp);
 229         if (ret)
 230                 return ret;
 231
 232         ret = stream_start(dev);
 233         if (ret)
 234                 return ret;
 235
 236         dev->output_running = 0;
 237         wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
 238         if (!dev->output_running) {
 239                 stream_stop(dev);
 240                 return -EPIPE;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 247 {
 248         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 249
 250         switch (cmd) {
 251         case SNDRV_PCM_TRIGGER_START:
 252         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 253                 activate_substream(dev, sub);
 254                 break;
 255         case SNDRV_PCM_TRIGGER_STOP:
 256         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 257                 deactivate_substream(dev, sub);
 258                 break;
 259         default:
 260                 return -EINVAL;
 261         }
 262
 263         return 0;
 264 }
 265
 266 static snd_pcm_uframes_t
 267 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 268 {
 269         int index = sub->number;
 270         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 271
 272         if (dev->input_panic || dev->output_panic)
 273                 return SNDRV_PCM_POS_XRUN;
 274
 275         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 276                 return bytes_to_frames(sub->runtime,
 277                                         dev->audio_out_buf_pos[index]);
 278         else
 279                 return bytes_to_frames(sub->runtime,
 280                                         dev->audio_in_buf_pos[index]);
 281 }
 282
 283 /* operators for both playback and capture */
 284 static struct snd_pcm_ops snd_usb_caiaq_ops = {
 285         .open =         snd_usb_caiaq_substream_open,
 286         .close =        snd_usb_caiaq_substream_close,
 287         .ioctl =        snd_pcm_lib_ioctl,
 288         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 289         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 290         .prepare =      snd_usb_caiaq_pcm_prepare,
 291         .trigger =      snd_usb_caiaq_pcm_trigger,
 292         .pointer =      snd_usb_caiaq_pcm_pointer
 293 };
 294
 295 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
 296                                       struct snd_pcm_substream **subs)
 297 {
 298         int stream, pb, *cnt;
 299         struct snd_pcm_substream *sub;
 300
 301         for (stream = 0; stream < dev->n_streams; stream++) {
 302                 sub = subs[stream];
 303                 if (!sub)
 304                         continue;
 305
 306                 pb = snd_pcm_lib_period_bytes(sub);
 307                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 308                                         &dev->period_out_count[stream] :
 309                                         &dev->period_in_count[stream];
 310
 311                 if (*cnt >= pb) {
 312                         snd_pcm_period_elapsed(sub);
 313                         *cnt %= pb;
 314                 }
 315         }
 316 }
 317
 318 static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
 319                               const struct urb *urb,
 320                               const struct usb_iso_packet_descriptor *iso)
 321 {
 322         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 323         struct snd_pcm_substream *sub;
 324         int stream, i;
 325
 326         if (all_substreams_zero(dev->sub_capture))
 327                 return;
 328
 329         for (i = 0; i < iso->actual_length;) {
 330                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 331                         sub = dev->sub_capture[stream];
 332                         if (sub) {
 333                                 struct snd_pcm_runtime *rt = sub->runtime;
 334                                 char *audio_buf = rt->dma_area;
 335                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 336                                 audio_buf[dev->audio_in_buf_pos[stream]++]
 337                                         = usb_buf[i];
 338                                 dev->period_in_count[stream]++;
 339                                 if (dev->audio_in_buf_pos[stream] == sz)
 340                                         dev->audio_in_buf_pos[stream] = 0;
 341                         }
 342                 }
 343         }
 344 }
 345
 346 static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
 347                               const struct urb *urb,
 348                               const struct usb_iso_packet_descriptor *iso)
 349 {
 350         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 351         unsigned char check_byte;
 352         struct snd_pcm_substream *sub;
 353         int stream, i;
 354
 355         for (i = 0; i < iso->actual_length;) {
 356                 if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 357                         for (stream = 0;
 358                              stream < dev->n_streams;
 359                              stream++, i++) {
 360                                 if (dev->first_packet)
 361                                         continue;
 362
 363                                 check_byte = MAKE_CHECKBYTE(dev, stream, i);
 364
 365                                 if ((usb_buf[i] & 0x3f) != check_byte)
 366                                         dev->input_panic = 1;
 367
 368                                 if (usb_buf[i] & 0x80)
 369                                         dev->output_panic = 1;
 370                         }
 371                 }
 372                 dev->first_packet = 0;
 373
 374                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 375                         sub = dev->sub_capture[stream];
 376                         if (dev->input_panic)
 377                                 usb_buf[i] = 0;
 378
 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         if (iso->actual_length < dev->bpp)
 401                 return;
 402
 403         switch (dev->spec.data_alignment) {
 404         case 0:
 405                 read_in_urb_mode0(dev, urb, iso);
 406                 break;
 407         case 2:
 408                 read_in_urb_mode2(dev, urb, iso);
 409                 break;
 410         }
 411
 412         if ((dev->input_panic || dev->output_panic) && !dev->warned) {
 413                 debug("streaming error detected %s %s\n",
 414                                 dev->input_panic ? "(input)" : "",
 415                                 dev->output_panic ? "(output)" : "");
 416                 dev->warned = 1;
 417         }
 418 }
 419
 420 static void fill_out_urb(struct snd_usb_caiaqdev *dev,
 421                          struct urb *urb,
 422                          const struct usb_iso_packet_descriptor *iso)
 423 {
 424         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 425         struct snd_pcm_substream *sub;
 426         int stream, i;
 427
 428         for (i = 0; i < iso->length;) {
 429                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 430                         sub = dev->sub_playback[stream];
 431                         if (sub) {
 432                                 struct snd_pcm_runtime *rt = sub->runtime;
 433                                 char *audio_buf = rt->dma_area;
 434                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 435                                 usb_buf[i] =
 436                                         audio_buf[dev->audio_out_buf_pos[stream]];
 437                                 dev->period_out_count[stream]++;
 438                                 dev->audio_out_buf_pos[stream]++;
 439                                 if (dev->audio_out_buf_pos[stream] == sz)
 440                                         dev->audio_out_buf_pos[stream] = 0;
 441                         } else
 442                                 usb_buf[i] = 0;
 443                 }
 444
 445                 /* fill in the check bytes */
 446                 if (dev->spec.data_alignment == 2 &&
 447                     i % (dev->n_streams * BYTES_PER_SAMPLE_USB) ==
 448                         (dev->n_streams * CHANNELS_PER_STREAM))
 449                     for (stream = 0; stream < dev->n_streams; stream++, i++)
 450                         usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
 451         }
 452 }
 453
 454 static void read_completed(struct urb *urb)
 455 {
 456         struct snd_usb_caiaq_cb_info *info = urb->context;
 457         struct snd_usb_caiaqdev *dev;
 458         struct urb *out;
 459         int frame, len, send_it = 0, outframe = 0;
 460
 461         if (urb->status || !info)
 462                 return;
 463
 464         dev = info->dev;
 465
 466         if (!dev->streaming)
 467                 return;
 468
 469         out = dev->data_urbs_out[info->index];
 470
 471         /* read the recently received packet and send back one which has
 472          * the same layout */
 473         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 474                 if (urb->iso_frame_desc[frame].status)
 475                         continue;
 476
 477                 len = urb->iso_frame_desc[outframe].actual_length;
 478                 out->iso_frame_desc[outframe].length = len;
 479                 out->iso_frame_desc[outframe].actual_length = 0;
 480                 out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
 481
 482                 if (len > 0) {
 483                         spin_lock(&dev->spinlock);
 484                         fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
 485                         read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
 486                         spin_unlock(&dev->spinlock);
 487                         check_for_elapsed_periods(dev, dev->sub_playback);
 488                         check_for_elapsed_periods(dev, dev->sub_capture);
 489                         send_it = 1;
 490                 }
 491
 492                 outframe++;
 493         }
 494
 495         if (send_it) {
 496                 out->number_of_packets = FRAMES_PER_URB;
 497                 out->transfer_flags = URB_ISO_ASAP;
 498                 usb_submit_urb(out, GFP_ATOMIC);
 499         }
 500
 501         /* re-submit inbound urb */
 502         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 503                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 504                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 505                 urb->iso_frame_desc[frame].actual_length = 0;
 506         }
 507
 508         urb->number_of_packets = FRAMES_PER_URB;
 509         urb->transfer_flags = URB_ISO_ASAP;
 510         usb_submit_urb(urb, GFP_ATOMIC);
 511 }
 512
 513 static void write_completed(struct urb *urb)
 514 {
 515         struct snd_usb_caiaq_cb_info *info = urb->context;
 516         struct snd_usb_caiaqdev *dev = info->dev;
 517
 518         if (!dev->output_running) {
 519                 dev->output_running = 1;
 520                 wake_up(&dev->prepare_wait_queue);
 521         }
 522 }
 523
 524 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
 525 {
 526         int i, frame;
 527         struct urb **urbs;
 528         struct usb_device *usb_dev = dev->chip.dev;
 529         unsigned int pipe;
 530
 531         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 532                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 533                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 534
 535         urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
 536         if (!urbs) {
 537                 log("unable to kmalloc() urbs, OOM!?\n");
 538                 *ret = -ENOMEM;
 539                 return NULL;
 540         }
 541
 542         for (i = 0; i < N_URBS; i++) {
 543                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 544                 if (!urbs[i]) {
 545                         log("unable to usb_alloc_urb(), OOM!?\n");
 546                         *ret = -ENOMEM;
 547                         return urbs;
 548                 }
 549
 550                 urbs[i]->transfer_buffer =
 551                         kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
 552                 if (!urbs[i]->transfer_buffer) {
 553                         log("unable to kmalloc() transfer buffer, OOM!?\n");
 554                         *ret = -ENOMEM;
 555                         return urbs;
 556                 }
 557
 558                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 559                         struct usb_iso_packet_descriptor *iso =
 560                                 &urbs[i]->iso_frame_desc[frame];
 561
 562                         iso->offset = BYTES_PER_FRAME * frame;
 563                         iso->length = BYTES_PER_FRAME;
 564                 }
 565
 566                 urbs[i]->dev = usb_dev;
 567                 urbs[i]->pipe = pipe;
 568                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 569                                                 * BYTES_PER_FRAME;
 570                 urbs[i]->context = &dev->data_cb_info[i];
 571                 urbs[i]->interval = 1;
 572                 urbs[i]->transfer_flags = URB_ISO_ASAP;
 573                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 574                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 575                                         read_completed : write_completed;
 576         }
 577
 578         *ret = 0;
 579         return urbs;
 580 }
 581
 582 static void free_urbs(struct urb **urbs)
 583 {
 584         int i;
 585
 586         if (!urbs)
 587                 return;
 588
 589         for (i = 0; i < N_URBS; i++) {
 590                 if (!urbs[i])
 591                         continue;
 592
 593                 usb_kill_urb(urbs[i]);
 594                 kfree(urbs[i]->transfer_buffer);
 595                 usb_free_urb(urbs[i]);
 596         }
 597
 598         kfree(urbs);
 599 }
 600
 601 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
 602 {
 603         int i, ret;
 604
 605         dev->n_audio_in  = max(dev->spec.num_analog_audio_in,
 606                                dev->spec.num_digital_audio_in) /
 607                                 CHANNELS_PER_STREAM;
 608         dev->n_audio_out = max(dev->spec.num_analog_audio_out,
 609                                dev->spec.num_digital_audio_out) /
 610                                 CHANNELS_PER_STREAM;
 611         dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);
 612
 613         debug("dev->n_audio_in = %d\n", dev->n_audio_in);
 614         debug("dev->n_audio_out = %d\n", dev->n_audio_out);
 615         debug("dev->n_streams = %d\n", dev->n_streams);
 616
 617         if (dev->n_streams > MAX_STREAMS) {
 618                 log("unable to initialize device, too many streams.\n");
 619                 return -EINVAL;
 620         }
 621
 622         ret = snd_pcm_new(dev->chip.card, dev->product_name, 0,
 623                         dev->n_audio_out, dev->n_audio_in, &dev->pcm);
 624
 625         if (ret < 0) {
 626                 log("snd_pcm_new() returned %d\n", ret);
 627                 return ret;
 628         }
 629
 630         dev->pcm->private_data = dev;
 631         strcpy(dev->pcm->name, dev->product_name);
 632
 633         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 634         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 635
 636         memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 637                         sizeof(snd_usb_caiaq_pcm_hardware));
 638
 639         /* setup samplerates */
 640         dev->samplerates = dev->pcm_info.rates;
 641         switch (dev->chip.usb_id) {
 642         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 643         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 644         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 645         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 646                 dev->samplerates |= SNDRV_PCM_RATE_192000;
 647                 /* fall thru */
 648         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 649         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 650                 dev->samplerates |= SNDRV_PCM_RATE_88200;
 651                 break;
 652         }
 653
 654         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 655                                 &snd_usb_caiaq_ops);
 656         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 657                                 &snd_usb_caiaq_ops);
 658
 659         snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
 660                                         SNDRV_DMA_TYPE_CONTINUOUS,
 661                                         snd_dma_continuous_data(GFP_KERNEL),
 662                                         MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
 663
 664         dev->data_cb_info =
 665                 kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS,
 666                                         GFP_KERNEL);
 667
 668         if (!dev->data_cb_info)
 669                 return -ENOMEM;
 670
 671         for (i = 0; i < N_URBS; i++) {
 672                 dev->data_cb_info[i].dev = dev;
 673                 dev->data_cb_info[i].index = i;
 674         }
 675
 676         dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 677         if (ret < 0) {
 678                 kfree(dev->data_cb_info);
 679                 free_urbs(dev->data_urbs_in);
 680                 return ret;
 681         }
 682
 683         dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 684         if (ret < 0) {
 685                 kfree(dev->data_cb_info);
 686                 free_urbs(dev->data_urbs_in);
 687                 free_urbs(dev->data_urbs_out);
 688                 return ret;
 689         }
 690
 691         return 0;
 692 }
 693
 694 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
 695 {
 696         debug("%s(%p)\n", __func__, dev);
 697         stream_stop(dev);
 698         free_urbs(dev->data_urbs_in);
 699         free_urbs(dev->data_urbs_out);
 700         kfree(dev->data_cb_info);
 701 }
 702