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caiaq-audio.c

/*
 *   Copyright (c) 2006-2008 Daniel Mack, Karsten Wiese
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/spinlock.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <linux/input.h>

#include "caiaq-device.h"
#include "caiaq-audio.h"

#define N_URBS                32
#define CLOCK_DRIFT_TOLERANCE 5
#define FRAMES_PER_URB        8
#define BYTES_PER_FRAME       512
#define CHANNELS_PER_STREAM   2
#define BYTES_PER_SAMPLE      3
#define BYTES_PER_SAMPLE_USB  4
#define MAX_BUFFER_SIZE       (128*1024)
#define MAX_ENDPOINT_SIZE     512

#define ENDPOINT_CAPTURE      2
#define ENDPOINT_PLAYBACK     6

#define MAKE_CHECKBYTE(dev,stream,i) \
      (stream << 1) | (~(i / (dev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)

static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {
      .info             = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | 
                     SNDRV_PCM_INFO_BLOCK_TRANSFER),
      .formats    = SNDRV_PCM_FMTBIT_S24_3BE,
      .rates            = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | 
                     SNDRV_PCM_RATE_96000),
      .rate_min   = 44100,
      .rate_max   = 0, /* will overwrite later */
      .channels_min     = CHANNELS_PER_STREAM,
      .channels_max     = CHANNELS_PER_STREAM,
      .buffer_bytes_max = MAX_BUFFER_SIZE,
      .period_bytes_min = 128,
      .period_bytes_max = MAX_BUFFER_SIZE,
      .periods_min      = 1,
      .periods_max      = 1024,
};

static void
activate_substream(struct snd_usb_caiaqdev *dev,
                 struct snd_pcm_substream *sub)
{
      if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
            dev->sub_playback[sub->number] = sub;
      else
            dev->sub_capture[sub->number] = sub;
}

static void 
deactivate_substream(struct snd_usb_caiaqdev *dev,
                 struct snd_pcm_substream *sub)
{
      unsigned long flags;
      spin_lock_irqsave(&dev->spinlock, flags);

      if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
            dev->sub_playback[sub->number] = NULL;
      else
            dev->sub_capture[sub->number] = NULL;

      spin_unlock_irqrestore(&dev->spinlock, flags);
}

static int
all_substreams_zero(struct snd_pcm_substream **subs)
{
      int i;
      for (i = 0; i < MAX_STREAMS; i++)
            if (subs[i] != NULL)
                  return 0;
      return 1;
}

static int stream_start(struct snd_usb_caiaqdev *dev)
{
      int i, ret;

      debug("%s(%p)\n", __func__, dev);

      if (dev->streaming)
            return -EINVAL;

      memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
      memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
      dev->input_panic = 0;
      dev->output_panic = 0;
      dev->first_packet = 1;
      dev->streaming = 1;

      for (i = 0; i < N_URBS; i++) {
            ret = usb_submit_urb(dev->data_urbs_in[i], GFP_ATOMIC);
            if (ret) {
                  log("unable to trigger read #%d! (ret %d)\n", i, ret);
                  dev->streaming = 0;
                  return -EPIPE;
            }
      }
      
      return 0;
}

static void stream_stop(struct snd_usb_caiaqdev *dev)
{
      int i;

      debug("%s(%p)\n", __func__, dev);
      if (!dev->streaming)
            return;
      
      dev->streaming = 0;

      for (i = 0; i < N_URBS; i++) {
            usb_kill_urb(dev->data_urbs_in[i]);
            usb_kill_urb(dev->data_urbs_out[i]);
      }
}

static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
{
      struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
      debug("%s(%p)\n", __func__, substream);
      substream->runtime->hw = dev->pcm_info;
      snd_pcm_limit_hw_rates(substream->runtime);
      return 0;
}

static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
{
      struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);

      debug("%s(%p)\n", __func__, substream);
      if (all_substreams_zero(dev->sub_playback) &&
          all_substreams_zero(dev->sub_capture)) {
            /* when the last client has stopped streaming, 
             * all sample rates are allowed again */
            stream_stop(dev);
            dev->pcm_info.rates = dev->samplerates;
      }

      return 0;
}

static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
                              struct snd_pcm_hw_params *hw_params)
{
      debug("%s(%p)\n", __func__, sub);
      return snd_pcm_lib_malloc_pages(sub, params_buffer_bytes(hw_params));
}

static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
{
      struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
      debug("%s(%p)\n", __func__, sub);
      deactivate_substream(dev, sub);
      return snd_pcm_lib_free_pages(sub);
}

/* this should probably go upstream */
#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
#error "Change this table"
#endif

static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
                                 48000, 64000, 88200, 96000, 176400, 192000 };

static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
{
      int bytes_per_sample, bpp, ret, i;
      int index = substream->number;
      struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      debug("%s(%p)\n", __func__, substream);
      
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            dev->audio_out_buf_pos[index] = BYTES_PER_SAMPLE + 1;
      else
            dev->audio_in_buf_pos[index] = BYTES_PER_SAMPLE;
      
      if (dev->streaming)
            return 0;
      
      /* the first client that opens a stream defines the sample rate
       * setting for all subsequent calls, until the last client closed. */
      for (i=0; i < ARRAY_SIZE(rates); i++)
            if (runtime->rate == rates[i])
                  dev->pcm_info.rates = 1 << i;
      
      snd_pcm_limit_hw_rates(runtime);

      bytes_per_sample = BYTES_PER_SAMPLE;
      if (dev->spec.data_alignment == 2)
            bytes_per_sample++;
      
      bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
            * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;

      if (bpp > MAX_ENDPOINT_SIZE)
            bpp = MAX_ENDPOINT_SIZE;

      ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
                                   runtime->sample_bits, bpp);
      if (ret)
            return ret;

      ret = stream_start(dev);
      if (ret)
            return ret;
      
      dev->output_running = 0;
      wait_event_timeout(dev->prepare_wait_queue, dev->output_running, HZ);
      if (!dev->output_running) {
            stream_stop(dev);
            return -EPIPE;
      }

      return 0;
}

static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
{
      struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            activate_substream(dev, sub);
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            deactivate_substream(dev, sub);
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

static snd_pcm_uframes_t
snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
{
      int index = sub->number;
      struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);

      if (dev->input_panic || dev->output_panic)
            return SNDRV_PCM_POS_XRUN;

      if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
            return bytes_to_frames(sub->runtime, 
                              dev->audio_out_buf_pos[index]);
      else
            return bytes_to_frames(sub->runtime,
                              dev->audio_in_buf_pos[index]);
}

/* operators for both playback and capture */
static struct snd_pcm_ops snd_usb_caiaq_ops = {
      .open =           snd_usb_caiaq_substream_open,
      .close =    snd_usb_caiaq_substream_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_usb_caiaq_pcm_hw_params,
      .hw_free =  snd_usb_caiaq_pcm_hw_free,
      .prepare =  snd_usb_caiaq_pcm_prepare,
      .trigger =  snd_usb_caiaq_pcm_trigger,
      .pointer =  snd_usb_caiaq_pcm_pointer
};
      
static void check_for_elapsed_periods(struct snd_usb_caiaqdev *dev,
                              struct snd_pcm_substream **subs)
{
      int stream, pb, *cnt;
      struct snd_pcm_substream *sub;

      for (stream = 0; stream < dev->n_streams; stream++) {
            sub = subs[stream];
            if (!sub)
                  continue;

            pb = frames_to_bytes(sub->runtime, 
                             sub->runtime->period_size);
            cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
                              &dev->period_out_count[stream] :
                              &dev->period_in_count[stream];

            if (*cnt >= pb) {
                  snd_pcm_period_elapsed(sub);
                  *cnt %= pb;
            }
      }
}

static void read_in_urb_mode0(struct snd_usb_caiaqdev *dev,
                        const struct urb *urb,
                        const struct usb_iso_packet_descriptor *iso)
{
      unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
      struct snd_pcm_substream *sub;
      int stream, i;

      if (all_substreams_zero(dev->sub_capture))
            return;

      for (i = 0; i < iso->actual_length;) {
            for (stream = 0; stream < dev->n_streams; stream++, i++) {
                  sub = dev->sub_capture[stream];
                  if (sub) {
                        struct snd_pcm_runtime *rt = sub->runtime;
                        char *audio_buf = rt->dma_area;
                        int sz = frames_to_bytes(rt, rt->buffer_size);
                        audio_buf[dev->audio_in_buf_pos[stream]++] 
                              = usb_buf[i];
                        dev->period_in_count[stream]++;
                        if (dev->audio_in_buf_pos[stream] == sz)
                              dev->audio_in_buf_pos[stream] = 0;
                  }
            }
      }
}

static void read_in_urb_mode2(struct snd_usb_caiaqdev *dev,
                        const struct urb *urb,
                        const struct usb_iso_packet_descriptor *iso)
{
      unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
      unsigned char check_byte;
      struct snd_pcm_substream *sub;
      int stream, i;

      for (i = 0; i < iso->actual_length;) {
            if (i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
                  for (stream = 0; 
                       stream < dev->n_streams; 
                       stream++, i++) {
                        if (dev->first_packet)
                              continue;

                        check_byte = MAKE_CHECKBYTE(dev, stream, i);
                        
                        if ((usb_buf[i] & 0x3f) != check_byte)
                              dev->input_panic = 1;

                        if (usb_buf[i] & 0x80)
                              dev->output_panic = 1;
                  }
            }
            dev->first_packet = 0;

            for (stream = 0; stream < dev->n_streams; stream++, i++) {
                  sub = dev->sub_capture[stream];
                  if (sub) {
                        struct snd_pcm_runtime *rt = sub->runtime;
                        char *audio_buf = rt->dma_area;
                        int sz = frames_to_bytes(rt, rt->buffer_size);
                        audio_buf[dev->audio_in_buf_pos[stream]++] =
                              usb_buf[i];
                        dev->period_in_count[stream]++;
                        if (dev->audio_in_buf_pos[stream] == sz)
                              dev->audio_in_buf_pos[stream] = 0;
                  }
            }
      }
}

static void read_in_urb(struct snd_usb_caiaqdev *dev,
                  const struct urb *urb,
                  const struct usb_iso_packet_descriptor *iso)
{
      if (!dev->streaming)
            return;

      switch (dev->spec.data_alignment) {
      case 0:
            read_in_urb_mode0(dev, urb, iso);
            break;
      case 2:
            read_in_urb_mode2(dev, urb, iso);
            break;
      }

      if (dev->input_panic || dev->output_panic) {
            debug("streaming error detected %s %s\n", 
                        dev->input_panic ? "(input)" : "",
                        dev->output_panic ? "(output)" : "");
      }
}

static void fill_out_urb(struct snd_usb_caiaqdev *dev, 
                   struct urb *urb, 
                   const struct usb_iso_packet_descriptor *iso)
{
      unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
      struct snd_pcm_substream *sub;
      int stream, i;
      
      for (i = 0; i < iso->length;) {
            for (stream = 0; stream < dev->n_streams; stream++, i++) {
                  sub = dev->sub_playback[stream];
                  if (sub) {
                        struct snd_pcm_runtime *rt = sub->runtime;
                        char *audio_buf = rt->dma_area;
                        int sz = frames_to_bytes(rt, rt->buffer_size);
                        usb_buf[i] =
                              audio_buf[dev->audio_out_buf_pos[stream]];
                        dev->period_out_count[stream]++;
                        dev->audio_out_buf_pos[stream]++;
                        if (dev->audio_out_buf_pos[stream] == sz)
                              dev->audio_out_buf_pos[stream] = 0;
                  } else
                        usb_buf[i] = 0;
            }

            /* fill in the check bytes */
            if (dev->spec.data_alignment == 2 &&
                i % (dev->n_streams * BYTES_PER_SAMPLE_USB) == 
                  (dev->n_streams * CHANNELS_PER_STREAM))
                for (stream = 0; stream < dev->n_streams; stream++, i++)
                  usb_buf[i] = MAKE_CHECKBYTE(dev, stream, i);
      }
}

static void read_completed(struct urb *urb)
{
      struct snd_usb_caiaq_cb_info *info = urb->context; 
      struct snd_usb_caiaqdev *dev;
      struct urb *out;
      int frame, len, send_it = 0, outframe = 0;

      if (urb->status || !info)
            return;

      dev = info->dev;

      if (!dev->streaming)
            return;

      out = dev->data_urbs_out[info->index];

      /* read the recently received packet and send back one which has
       * the same layout */
      for (frame = 0; frame < FRAMES_PER_URB; frame++) {
            if (urb->iso_frame_desc[frame].status)
                  continue;

            len = urb->iso_frame_desc[outframe].actual_length;
            out->iso_frame_desc[outframe].length = len;
            out->iso_frame_desc[outframe].actual_length = 0;
            out->iso_frame_desc[outframe].offset = BYTES_PER_FRAME * frame;
            
            if (len > 0) {
                  spin_lock(&dev->spinlock);
                  fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
                  read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
                  spin_unlock(&dev->spinlock);
                  check_for_elapsed_periods(dev, dev->sub_playback);
                  check_for_elapsed_periods(dev, dev->sub_capture);
                  send_it = 1;
            }

            outframe++;
      }

      if (send_it) {
            out->number_of_packets = FRAMES_PER_URB;
            out->transfer_flags = URB_ISO_ASAP;
            usb_submit_urb(out, GFP_ATOMIC);
      }
      
      /* re-submit inbound urb */
      for (frame = 0; frame < FRAMES_PER_URB; frame++) {
            urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
            urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
            urb->iso_frame_desc[frame].actual_length = 0;
      }
      
      urb->number_of_packets = FRAMES_PER_URB;
      urb->transfer_flags = URB_ISO_ASAP;
      usb_submit_urb(urb, GFP_ATOMIC);
}

static void write_completed(struct urb *urb)
{
      struct snd_usb_caiaq_cb_info *info = urb->context;
      struct snd_usb_caiaqdev *dev = info->dev;

      if (!dev->output_running) {
            dev->output_running = 1;
            wake_up(&dev->prepare_wait_queue);
      }
}

static struct urb **alloc_urbs(struct snd_usb_caiaqdev *dev, int dir, int *ret)
{
      int i, frame;
      struct urb **urbs;
      struct usb_device *usb_dev = dev->chip.dev;
      unsigned int pipe;

      pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ? 
            usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
            usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);

      urbs = kmalloc(N_URBS * sizeof(*urbs), GFP_KERNEL);
      if (!urbs) {
            log("unable to kmalloc() urbs, OOM!?\n");
            *ret = -ENOMEM;
            return NULL;
      }

      for (i = 0; i < N_URBS; i++) {
            urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
            if (!urbs[i]) {
                  log("unable to usb_alloc_urb(), OOM!?\n");
                  *ret = -ENOMEM;
                  return urbs;
            }

            urbs[i]->transfer_buffer = 
                  kmalloc(FRAMES_PER_URB * BYTES_PER_FRAME, GFP_KERNEL);
            if (!urbs[i]->transfer_buffer) {
                  log("unable to kmalloc() transfer buffer, OOM!?\n");
                  *ret = -ENOMEM;
                  return urbs;
            }
            
            for (frame = 0; frame < FRAMES_PER_URB; frame++) {
                  struct usb_iso_packet_descriptor *iso = 
                        &urbs[i]->iso_frame_desc[frame];
                  
                  iso->offset = BYTES_PER_FRAME * frame;
                  iso->length = BYTES_PER_FRAME;
            }
            
            urbs[i]->dev = usb_dev;
            urbs[i]->pipe = pipe;
            urbs[i]->transfer_buffer_length = FRAMES_PER_URB 
                                    * BYTES_PER_FRAME;
            urbs[i]->context = &dev->data_cb_info[i];
            urbs[i]->interval = 1;
            urbs[i]->transfer_flags = URB_ISO_ASAP;
            urbs[i]->number_of_packets = FRAMES_PER_URB;
            urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
                              read_completed : write_completed;
      }

      *ret = 0;
      return urbs;
}

static void free_urbs(struct urb **urbs)
{
      int i;

      if (!urbs)
            return;

      for (i = 0; i < N_URBS; i++) {
            if (!urbs[i])
                  continue;
            
            usb_kill_urb(urbs[i]);
            kfree(urbs[i]->transfer_buffer);
            usb_free_urb(urbs[i]);
      }

      kfree(urbs);
}

int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *dev)
{
      int i, ret;

      dev->n_audio_in  = max(dev->spec.num_analog_audio_in, 
                         dev->spec.num_digital_audio_in) / 
                        CHANNELS_PER_STREAM;
      dev->n_audio_out = max(dev->spec.num_analog_audio_out,
                         dev->spec.num_digital_audio_out) / 
                        CHANNELS_PER_STREAM;
      dev->n_streams = max(dev->n_audio_in, dev->n_audio_out);

      debug("dev->n_audio_in = %d\n", dev->n_audio_in);
      debug("dev->n_audio_out = %d\n", dev->n_audio_out);
      debug("dev->n_streams = %d\n", dev->n_streams);

      if (dev->n_streams > MAX_STREAMS) {
            log("unable to initialize device, too many streams.\n");
            return -EINVAL;
      }

      ret = snd_pcm_new(dev->chip.card, dev->product_name, 0, 
                  dev->n_audio_out, dev->n_audio_in, &dev->pcm);

      if (ret < 0) {
            log("snd_pcm_new() returned %d\n", ret);
            return ret;
      }

      dev->pcm->private_data = dev;
      strcpy(dev->pcm->name, dev->product_name);

      memset(dev->sub_playback, 0, sizeof(dev->sub_playback));
      memset(dev->sub_capture, 0, sizeof(dev->sub_capture));
      
      memcpy(&dev->pcm_info, &snd_usb_caiaq_pcm_hardware,
                  sizeof(snd_usb_caiaq_pcm_hardware));

      /* setup samplerates */
      dev->samplerates = dev->pcm_info.rates;
      switch (dev->chip.usb_id) {
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
            dev->samplerates |= SNDRV_PCM_RATE_88200;
            dev->samplerates |= SNDRV_PCM_RATE_192000;
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
            dev->samplerates |= SNDRV_PCM_RATE_88200;
            break;
      }

      snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 
                        &snd_usb_caiaq_ops);
      snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 
                        &snd_usb_caiaq_ops);

      snd_pcm_lib_preallocate_pages_for_all(dev->pcm,
                              SNDRV_DMA_TYPE_CONTINUOUS,
                              snd_dma_continuous_data(GFP_KERNEL),
                              MAX_BUFFER_SIZE, MAX_BUFFER_SIZE);

      dev->data_cb_info =
            kmalloc(sizeof(struct snd_usb_caiaq_cb_info) * N_URBS, 
                              GFP_KERNEL);

      if (!dev->data_cb_info)
            return -ENOMEM;

      for (i = 0; i < N_URBS; i++) {
            dev->data_cb_info[i].dev = dev;
            dev->data_cb_info[i].index = i;
      }
      
      dev->data_urbs_in = alloc_urbs(dev, SNDRV_PCM_STREAM_CAPTURE, &ret);
      if (ret < 0) {
            kfree(dev->data_cb_info);
            free_urbs(dev->data_urbs_in);
            return ret;
      }
      
      dev->data_urbs_out = alloc_urbs(dev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
      if (ret < 0) {
            kfree(dev->data_cb_info);
            free_urbs(dev->data_urbs_in);
            free_urbs(dev->data_urbs_out);
            return ret;
      }

      return 0;
}

void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *dev)
{
      debug("%s(%p)\n", __func__, dev);
      stream_stop(dev);
      free_urbs(dev->data_urbs_in);
      free_urbs(dev->data_urbs_out);
      kfree(dev->data_cb_info);
}


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