linux/sound/usb/caiaq/caiaq-audio.c
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   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
  50static 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
  67static void
  68activate_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
  77static void 
  78deactivate_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
  92static int
  93all_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
 102static 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
 130static 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
 146static 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
 155static 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
 171static 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
 178static 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
 191static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 192                                 48000, 64000, 88200, 96000, 176400, 192000 };
 193
 194static 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
 248static 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
 268static snd_pcm_uframes_t
 269snd_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 */
 286static 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        
 297static 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
 321static 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
 349static 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
 393static 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
 416static 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
 450static 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
 509static 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
 520static 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
 578static 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
 597int 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        case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 641                dev->samplerates |= SNDRV_PCM_RATE_88200;
 642                dev->samplerates |= SNDRV_PCM_RATE_192000;
 643                break;
 644        case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 645                dev->samplerates |= SNDRV_PCM_RATE_88200;
 646                break;
 647        }
 648
 649        snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 
 650                                &snd_usb_caiaq_ops);
 651        snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 
 652                                &snd_usb_caiaq_ops);
 653
 654        snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
 655                                        SNDRV_DMA_TYPE_CONTINUOUS,
 656                                        snd_dma_continuous_data(GFP_KERNEL),
 657                                        MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);
 658
 659        dev->data_cb_info =
 660                kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS, 
 661                                        GFP_KERNEL);
 662
 663        if (!dev->data_cb_info)
 664                return -ENOMEM;
 665
 666        for (i = 0; i < N_URBS; i++) {
 667                dev->data_cb_info[i].dev = dev;
 668                dev->data_cb_info[i].index = i;
 669        }
 670        
 671        dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 672        if (ret < 0) {
 673                kfree(dev->data_cb_info);
 674                free_urbs(dev->data_urbs_in);
 675                return ret;
 676        }
 677        
 678        dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 679        if (ret < 0) {
 680                kfree(dev->data_cb_info);
 681                free_urbs(dev->data_urbs_in);
 682                free_urbs(dev->data_urbs_out);
 683                return ret;
 684        }
 685
 686        return 0;
 687}
 688
 689void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
 690{
 691        debug("%s(%p)\n", __func__, dev);
 692        stream_stop(dev);
 693        free_urbs(dev->data_urbs_in);
 694        free_urbs(dev->data_urbs_out);
 695        kfree(dev->data_cb_info);
 696}
 697
 698