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         dev->warned = 0;
 118
 119         for (i = 0; i < N_URBS; i++) {
 120                 ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
 121                 if (ret) {
 122                         log("unable to trigger read #%d! (ret %d)\n", i, ret);
 123                         dev->streaming = 0;
 124                         return -EPIPE;
 125                 }
 126         }
 127
 128         return 0;
 129 }
 130
 131 static void stream_stop(struct snd_usb_caiaqdev *dev)
 132 {
 133         int i;
 134
 135         debug("%s(%p)\n", __func__, dev);
 136         if (!dev->streaming)
 137                 return;
 138
 139         dev->streaming = 0;
 140
 141         for (i = 0; i < N_URBS; i++) {
 142                 usb_kill_urb(dev->data_urbs_in[i]);
 143                 usb_kill_urb(dev->data_urbs_out[i]);
 144         }
 145 }
 146
 147 static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
 148 {
 149         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 150         debug("%s(%p)\n", __func__, substream);
 151         substream->runtime->hw = dev->pcm_info;
 152         snd_pcm_limit_hw_rates(substream->runtime);
 153         return 0;
 154 }
 155
 156 static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
 157 {
 158         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 159
 160         debug("%s(%p)\n", __func__, substream);
 161         if (all_substreams_zero(dev->sub_playback) &&
 162             all_substreams_zero(dev->sub_capture)) {
 163                 /* when the last client has stopped streaming,
 164                  * all sample rates are allowed again */
 165                 stream_stop(dev);
 166                 dev->pcm_info.rates = dev->samplerates;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
 173                                         struct snd_pcm_hw_params *hw_params)
 174 {
 175         debug("%s(%p)\n", __func__, sub);
 176         return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));
 177 }
 178
 179 static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
 180 {
 181         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 182         debug("%s(%p)\n", __func__, sub);
 183         deactivate_substream(dev, sub);
 184         return snd_pcm_lib_free_pages(sub);
 185 }
 186
 187 /* this should probably go upstream */
 188 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
 189 #error "Change this table"
 190 #endif
 191
 192 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 193                                  48000, 64000, 88200, 96000, 176400, 192000 };
 194
 195 static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
 196 {
 197         int bytes_per_sample, bpp, ret, i;
 198         int index = substream->number;
 199         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
 200         struct snd_pcm_runtime *runtime = substream->runtime;
 201
 202         debug("%s(%p)\n", __func__, substream);
 203
 204         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 205                 dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
 206         else
 207                 dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE;
 208
 209         if (dev->streaming)
 210                 return 0;
 211
 212         /* the first client that opens a stream defines the sample rate
 213          * setting for all subsequent calls, until the last client closed. */
 214         for (i=0; i < ARRAY_SIZE(rates); i++)
 215                 if (runtime->rate == rates[i])
 216                         dev->pcm_info.rates = 1 << i;
 217
 218         snd_pcm_limit_hw_rates(runtime);
 219
 220         bytes_per_sample = BYTES_PER_SAMPLE;
 221         if (dev->spec.data_alignment == 2)
 222                 bytes_per_sample++;
 223
 224         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 225                 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
 226
 227         if (bpp > MAX_ENDPOINT_SIZE)
 228                 bpp = MAX_ENDPOINT_SIZE;
 229
 230         ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
 231                                              runtime->sample_bits, bpp);
 232         if (ret)
 233                 return ret;
 234
 235         ret = stream_start(dev);
 236         if (ret)
 237                 return ret;
 238
 239         dev->output_running = 0;
 240         wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
 241         if (!dev->output_running) {
 242                 stream_stop(dev);
 243                 return -EPIPE;
 244         }
 245
 246         return 0;
 247 }
 248
 249 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 250 {
 251         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 252
 253         switch (cmd) {
 254         case SNDRV_PCM_TRIGGER_START:
 255         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 256                 activate_substream(dev, sub);
 257                 break;
 258         case SNDRV_PCM_TRIGGER_STOP:
 259         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 260                 deactivate_substream(dev, sub);
 261                 break;
 262         default:
 263                 return -EINVAL;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static snd_pcm_uframes_t
 270 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 271 {
 272         int index = sub->number;
 273         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
 274
 275         if (dev->input_panic || dev->output_panic)
 276                 return SNDRV_PCM_POS_XRUN;
 277
 278         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 279                 return bytes_to_frames(sub->runtime,
 280                                         dev->audio_out_buf_pos[index]);
 281         else
 282                 return bytes_to_frames(sub->runtime,
 283                                         dev->audio_in_buf_pos[index]);
 284 }
 285
 286 /* operators for both playback and capture */
 287 static struct snd_pcm_ops snd_usb_caiaq_ops = {
 288         .open =         snd_usb_caiaq_substream_open,
 289         .close =        snd_usb_caiaq_substream_close,
 290         .ioctl =        snd_pcm_lib_ioctl,
 291         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 292         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 293         .prepare =      snd_usb_caiaq_pcm_prepare,
 294         .trigger =      snd_usb_caiaq_pcm_trigger,
 295         .pointer =      snd_usb_caiaq_pcm_pointer
 296 };
 297
 298 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
 299                                       struct snd_pcm_substream **subs)
 300 {
 301         int stream, pb, *cnt;
 302         struct snd_pcm_substream *sub;
 303
 304         for (stream = 0; stream < dev->n_streams; stream++) {
 305                 sub = subs[stream];
 306                 if (!sub)
 307                         continue;
 308
 309                 pb = frames_to_bytes(sub->runtime,
 310                                      sub->runtime->period_size);
 311                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 312                                         &dev->period_out_count[stream] :
 313                                         &dev->period_in_count[stream];
 314
 315                 if (*cnt >= pb) {
 316                         snd_pcm_period_elapsed(sub);
 317                         *cnt %= pb;
 318                 }
 319         }
 320 }
 321
 322 static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
 323                               const struct urb *urb,
 324                               const struct usb_iso_packet_descriptor *iso)
 325 {
 326         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 327         struct snd_pcm_substream *sub;
 328         int stream, i;
 329
 330         if (all_substreams_zero(dev->sub_capture))
 331                 return;
 332
 333         for (i = 0; i < iso->actual_length;) {
 334                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 335                         sub = dev->sub_capture[stream];
 336                         if (sub) {
 337                                 struct snd_pcm_runtime *rt = sub->runtime;
 338                                 char *audio_buf = rt->dma_area;
 339                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 340                                 audio_buf[dev->audio_in_buf_pos[stream]++]
 341                                         = usb_buf[i];
 342                                 dev->period_in_count[stream]++;
 343                                 if (dev->audio_in_buf_pos[stream] == sz)
 344                                         dev->audio_in_buf_pos[stream] = 0;
 345                         }
 346                 }
 347         }
 348 }
 349
 350 static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
 351                               const struct urb *urb,
 352                               const struct usb_iso_packet_descriptor *iso)
 353 {
 354         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 355         unsigned char check_byte;
 356         struct snd_pcm_substream *sub;
 357         int stream, i;
 358
 359         for (i = 0; i < iso->actual_length;) {
 360                 if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 361                         for (stream = 0;
 362                              stream < dev->n_streams;
 363                              stream++, i++) {
 364                                 if (dev->first_packet)
 365                                         continue;
 366
 367                                 check_byte = MAKE_CHECKBYTE(dev, stream, i);
 368
 369                                 if ((usb_buf[i] & 0x3f) != check_byte)
 370                                         dev->input_panic = 1;
 371
 372                                 if (usb_buf[i] & 0x80)
 373                                         dev->output_panic = 1;
 374                         }
 375                 }
 376                 dev->first_packet = 0;
 377
 378                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 379                         sub = dev->sub_capture[stream];
 380                         if (dev->input_panic)
 381                                 usb_buf[i] = 0;
 382
 383                         if (sub) {
 384                                 struct snd_pcm_runtime *rt = sub->runtime;
 385                                 char *audio_buf = rt->dma_area;
 386                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 387                                 audio_buf[dev->audio_in_buf_pos[stream]++] =
 388                                         usb_buf[i];
 389                                 dev->period_in_count[stream]++;
 390                                 if (dev->audio_in_buf_pos[stream] == sz)
 391                                         dev->audio_in_buf_pos[stream] = 0;
 392                         }
 393                 }
 394         }
 395 }
 396
 397 static void read_in_urb(struct snd_usb_caiaqdev *dev,
 398                         const struct urb *urb,
 399                         const struct usb_iso_packet_descriptor *iso)
 400 {
 401         if (!dev->streaming)
 402                 return;
 403
 404         if (iso->actual_length < dev->bpp)
 405                 return;
 406
 407         switch (dev->spec.data_alignment) {
 408         case 0:
 409                 read_in_urb_mode0(dev, urb, iso);
 410                 break;
 411         case 2:
 412                 read_in_urb_mode2(dev, urb, iso);
 413                 break;
 414         }
 415
 416         if ((dev->input_panic || dev->output_panic) && !dev->warned) {
 417                 debug("streaming error detected %s %s\n",
 418                                 dev->input_panic ? "(input)" : "",
 419                                 dev->output_panic ? "(output)" : "");
 420                 dev->warned = 1;
 421         }
 422 }
 423
 424 static void fill_out_urb(struct snd_usb_caiaqdev *dev,
 425                          struct urb *urb,
 426                          const struct usb_iso_packet_descriptor *iso)
 427 {
 428         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 429         struct snd_pcm_substream *sub;
 430         int stream, i;
 431
 432         for (i = 0; i < iso->length;) {
 433                 for (stream = 0; stream < dev->n_streams; stream++, i++) {
 434                         sub = dev->sub_playback[stream];
 435                         if (sub) {
 436                                 struct snd_pcm_runtime *rt = sub->runtime;
 437                                 char *audio_buf = rt->dma_area;
 438                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 439                                 usb_buf[i] =
 440                                         audio_buf[dev->audio_out_buf_pos[stream]];
 441                                 dev->period_out_count[stream]++;
 442                                 dev->audio_out_buf_pos[stream]++;
 443                                 if (dev->audio_out_buf_pos[stream] == sz)
 444                                         dev->audio_out_buf_pos[stream] = 0;
 445                         } else
 446                                 usb_buf[i] = 0;
 447                 }
 448
 449                 /* fill in the check bytes */
 450                 if (dev->spec.data_alignment == 2 &&
 451                     i % (dev->n_streams * BYTES_PER_SAMPLE_USB) ==
 452                         (dev->n_streams * CHANNELS_PER_STREAM))
 453                     for (stream = 0; stream < dev->n_streams; stream++, i++)
 454                         usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
 455         }
 456 }
 457
 458 static void read_completed(struct urb *urb)
 459 {
 460         struct snd_usb_caiaq_cb_info *info = urb->context;
 461         struct snd_usb_caiaqdev *dev;
 462         struct urb *out;
 463         int frame, len, send_it = 0, outframe = 0;
 464
 465         if (urb->status || !info)
 466                 return;
 467
 468         dev = info->dev;
 469
 470         if (!dev->streaming)
 471                 return;
 472
 473         out = dev->data_urbs_out[info->index];
 474
 475         /* read the recently received packet and send back one which has
 476          * the same layout */
 477         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 478                 if (urb->iso_frame_desc[frame].status)
 479                         continue;
 480
 481                 len = urb->iso_frame_desc[outframe].actual_length;
 482                 out->iso_frame_desc[outframe].length = len;
 483                 out->iso_frame_desc[outframe].actual_length = 0;
 484                 out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
 485
 486                 if (len > 0) {
 487                         spin_lock(&dev->spinlock);
 488                         fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
 489                         read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
 490                         spin_unlock(&dev->spinlock);
 491                         check_for_elapsed_periods(dev, dev->sub_playback);
 492                         check_for_elapsed_periods(dev, dev->sub_capture);
 493                         send_it = 1;
 494                 }
 495
 496                 outframe++;
 497         }
 498
 499         if (send_it) {
 500                 out->number_of_packets = FRAMES_PER_URB;
 501                 out->transfer_flags = URB_ISO_ASAP;
 502                 usb_submit_urb(out, GFP_ATOMIC);
 503         }
 504
 505         /* re-submit inbound urb */
 506         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 507                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 508                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 509                 urb->iso_frame_desc[frame].actual_length = 0;
 510         }
 511
 512         urb->number_of_packets = FRAMES_PER_URB;
 513         urb->transfer_flags = URB_ISO_ASAP;
 514         usb_submit_urb(urb, GFP_ATOMIC);
 515 }
 516
 517 static void write_completed(struct urb *urb)
 518 {
 519         struct snd_usb_caiaq_cb_info *info = urb->context;
 520         struct snd_usb_caiaqdev *dev = info->dev;
 521
 522         if (!dev->output_running) {
 523                 dev->output_running = 1;
 524                 wake_up(&dev->prepare_wait_queue);
 525         }
 526 }
 527
 528 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
 529 {
 530         int i, frame;
 531         struct urb **urbs;
 532         struct usb_device *usb_dev = dev->chip.dev;
 533         unsigned int pipe;
 534
 535         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 536                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 537                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 538
 539         urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
 540         if (!urbs) {
 541                 log("unable to kmalloc() urbs, OOM!?\n");
 542                 *ret = -ENOMEM;
 543                 return NULL;
 544         }
 545
 546         for (i = 0; i < N_URBS; i++) {
 547                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 548                 if (!urbs[i]) {
 549                         log("unable to usb_alloc_urb(), OOM!?\n");
 550                         *ret = -ENOMEM;
 551                         return urbs;
 552                 }
 553
 554                 urbs[i]->transfer_buffer =
 555                         kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
 556                 if (!urbs[i]->transfer_buffer) {
 557                         log("unable to kmalloc() transfer buffer, OOM!?\n");
 558                         *ret = -ENOMEM;
 559                         return urbs;
 560                 }
 561
 562                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 563                         struct usb_iso_packet_descriptor *iso =
 564                                 &urbs[i]->iso_frame_desc[frame];
 565
 566                         iso->offset = BYTES_PER_FRAME * frame;
 567                         iso->length = BYTES_PER_FRAME;
 568                 }
 569
 570                 urbs[i]->dev = usb_dev;
 571                 urbs[i]->pipe = pipe;
 572                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 573                                                 * BYTES_PER_FRAME;
 574                 urbs[i]->context = &dev->data_cb_info[i];
 575                 urbs[i]->interval = 1;
 576                 urbs[i]->transfer_flags = URB_ISO_ASAP;
 577                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 578                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 579                                         read_completed : write_completed;
 580         }
 581
 582         *ret = 0;
 583         return urbs;
 584 }
 585
 586 static void free_urbs(struct urb **urbs)
 587 {
 588         int i;
 589
 590         if (!urbs)
 591                 return;
 592
 593         for (i = 0; i < N_URBS; i++) {
 594                 if (!urbs[i])
 595                         continue;
 596
 597                 usb_kill_urb(urbs[i]);
 598                 kfree(urbs[i]->transfer_buffer);
 599                 usb_free_urb(urbs[i]);
 600         }
 601
 602         kfree(urbs);
 603 }
 604
 605 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
 606 {
 607         int i, ret;
 608
 609         dev->n_audio_in  = max(dev->spec.num_analog_audio_in,
 610                                dev->spec.num_digital_audio_in) /
 611                                 CHANNELS_PER_STREAM;
 612         dev->n_audio_out = max(dev->spec.num_analog_audio_out,
 613                                dev->spec.num_digital_audio_out) /
 614                                 CHANNELS_PER_STREAM;
 615         dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);
 616
 617         debug("dev->n_audio_in = %d\n", dev->n_audio_in);
 618         debug("dev->n_audio_out = %d\n", dev->n_audio_out);
 619         debug("dev->n_streams = %d\n", dev->n_streams);
 620
 621         if (dev->n_streams > MAX_STREAMS) {
 622                 log("unable to initialize device, too many streams.\n");
 623                 return -EINVAL;
 624         }
 625
 626         ret = snd_pcm_new(dev->chip.card, dev->product_name, 0,
 627                         dev->n_audio_out, dev->n_audio_in, &dev->pcm);
 628
 629         if (ret < 0) {
 630                 log("snd_pcm_new() returned %d\n", ret);
 631                 return ret;
 632         }
 633
 634         dev->pcm->private_data = dev;
 635         strcpy(dev->pcm->name, dev->product_name);
 636
 637         memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
 638         memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
 639
 640         memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 641                         sizeof(snd_usb_caiaq_pcm_hardware));
 642
 643         /* setup samplerates */
 644         dev->samplerates = dev->pcm_info.rates;
 645         switch (dev->chip.usb_id) {
 646         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 647         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 648         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 649         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 650                 dev->samplerates |= SNDRV_PCM_RATE_192000;
 651                 /* fall thru */
 652         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 653         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 654                 dev->samplerates |= SNDRV_PCM_RATE_88200;
 655                 break;
 656         }
 657
 658         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 659                                 &snd_usb_caiaq_ops);
 660         snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 661                                 &snd_usb_caiaq_ops);
 662
 663         snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
 664                                         SNDRV_DMA_TYPE_CONTINUOUS,
 665                                         snd_dma_continuous_data(GFP_KERNEL),
 666                                         MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
 667
 668         dev->data_cb_info =
 669                 kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS,
 670                                         GFP_KERNEL);
 671
 672         if (!dev->data_cb_info)
 673                 return -ENOMEM;
 674
 675         for (i = 0; i < N_URBS; i++) {
 676                 dev->data_cb_info[i].dev = dev;
 677                 dev->data_cb_info[i].index = i;
 678         }
 679
 680         dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 681         if (ret < 0) {
 682                 kfree(dev->data_cb_info);
 683                 free_urbs(dev->data_urbs_in);
 684                 return ret;
 685         }
 686
 687         dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 688         if (ret < 0) {
 689                 kfree(dev->data_cb_info);
 690                 free_urbs(dev->data_urbs_in);
 691                 free_urbs(dev->data_urbs_out);
 692                 return ret;
 693         }
 694
 695         return 0;
 696 }
 697
 698 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
 699 {
 700         debug("%s(%p)\n", __func__, dev);
 701         stream_stop(dev);
 702         free_urbs(dev->data_urbs_in);
 703         free_urbs(dev->data_urbs_out);
 704         kfree(dev->data_cb_info);
 705 }
 706