[ALSA] Add Native Instrument usb audio device support

Add snd-usb-caiaq driver to support caiaq usb-audio devices from
Native Instrument:
	* Native Instruments RigKontrol2
	* Native Instruments Kore Controller
	* Native Instruments Audio Kontrol 1
	* Native Instruments Audio 8 DJ

Signed-off-by: Daniel Mack <daniel@caiaq.org>
Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 706 insertions, 0 deletions

diff --git a/sound/usb/caiaq/caiaq-audio.c b/sound/usb/caiaq/caiaq-audio.c
new file mode 100644
index 000000000000..e80c8db237d3
--- /dev/null
+++ b/sound/usb/caiaq/caiaq-audio.c
@@ -0,0 +1,706 @@
+/*
+ *   Copyright (c) 2006,2007 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 <sound/driver.h>
+#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>
+#ifdef CONFIG_SND_USB_CAIAQ_INPUT
+#include <linux/input.h>
+#endif
+
+#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 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 = 4096,
+	.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)
+{
+	if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		dev->sub_playback[sub->number] = NULL;
+	else
+		dev->sub_capture[sub->number] = NULL;
+}
+
+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("stream_start(%p)\n", dev);
+	spin_lock_irq(&dev->spinlock);
+	if (dev->streaming) {
+		spin_unlock_irq(&dev->spinlock);
+		return -EINVAL;
+	}
+
+	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 initial read #%d! (ret = %d)\n",
+				i, ret);
+			dev->streaming = 0;
+			spin_unlock_irq(&dev->spinlock);
+			return -EPIPE;
+		}
+	}
+	
+	spin_unlock_irq(&dev->spinlock);
+	return 0;
+}
+
+static void stream_stop(struct snd_usb_caiaqdev *dev)
+{
+	int i;
+	
+	debug("stream_stop(%p)\n", dev);
+	if (!dev->streaming)
+		return;
+	
+	dev->streaming = 0;
+	for (i = 0; i < N_URBS; i++) {
+		usb_unlink_urb(dev->data_urbs_in[i]);
+		usb_unlink_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("snd_usb_caiaq_substream_open(%p)\n", 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("snd_usb_caiaq_substream_close(%p)\n", 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("snd_usb_caiaq_pcm_hw_params(%p)\n", 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("snd_usb_caiaq_pcm_hw_free(%p)\n", sub);
+	spin_lock_irq(&dev->spinlock);
+	deactivate_substream(dev, sub);
+	spin_unlock_irq(&dev->spinlock);
+	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("snd_usb_caiaq_pcm_prepare(%p)\n", 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] = 0;
+	
+	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;
+	
+	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:
+		spin_lock(&dev->spinlock);
+		activate_substream(dev, sub);
+		spin_unlock(&dev->spinlock);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		spin_lock(&dev->spinlock);
+		deactivate_substream(dev, sub);
+		spin_unlock(&dev->spinlock);
+		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;
+
+	spin_lock(&dev->spinlock);
+	
+	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;
+			}
+		}
+	}
+	
+	spin_unlock(&dev->spinlock);
+}
+
+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;
+
+	spin_lock(&dev->spinlock);
+	
+	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;
+			}
+		}
+	}
+
+	spin_unlock(&dev->spinlock);
+}
+
+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)" : "");
+	}
+
+	check_for_elapsed_periods(dev, dev->sub_capture);
+}
+
+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;
+
+	spin_lock(&dev->spinlock);
+	
+	for (i = 0; i < iso->length;) {
+		for (stream = 0; stream < dev->n_streams; stream++) {
+			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->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);
+		}
+	}
+
+	spin_unlock(&dev->spinlock);
+	check_for_elapsed_periods(dev, dev->sub_playback);
+}
+
+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) {
+			fill_out_urb(dev, out, &out->iso_frame_desc[outframe]);
+			read_in_urb(dev, urb, &urb->iso_frame_desc[frame]);
+			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 __devinit 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):
+		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("snd_usb_caiaq_audio_free (%p)\n", dev);
+	stream_stop(dev);
+	free_urbs(dev->data_urbs_in);
+	free_urbs(dev->data_urbs_out);
+	kfree(dev->data_cb_info);
+}
+