[ALSA] Add Native Instrument usb audio device support (523f1dce) · Commits · e / devices / android_kernel_fairphone_FP3

Documentation/sound/alsa/ALSA-Configuration.txt

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Original line number	Diff line number	Diff line
		@@ -1697,6 +1697,17 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.

		This module supports multiple devices, autoprobe and hotplugging.

		Module snd-usb-caiaq
		--------------------

		Module for caiaq UB audio interfaces,
		* Native Instruments RigKontrol2
		* Native Instruments Kore Controller
		* Native Instruments Audio Kontrol 1
		* Native Instruments Audio 8 DJ

		This module supports multiple devices, autoprobe and hotplugging.

		Module snd-usb-usx2y
		--------------------

sound/usb/Kconfig

+28 −0

Original line number	Diff line number	Diff line
		@@ -29,5 +29,33 @@ config SND_USB_USX2Y
		To compile this driver as a module, choose M here: the module
		will be called snd-usb-usx2y.

		config SND_USB_CAIAQ
		tristate "Native Instruments USB audio devices"
		depends on SND && USB
		select SND_HWDEP
		select SND_RAWMIDI
		select SND_PCM
		help
		Say Y here to include support for caiaq USB audio interfaces,
		namely:

		* Native Instruments RigKontrol2
		* Native Instruments Kore Controller
		* Native Instruments Audio Kontrol 1
		* Native Instruments Audio 8 DJ

		To compile this driver as a module, choose M here: the module
		will be called snd-usb-caiaq.

		config SND_USB_CAIAQ_INPUT
		bool "enable input device for controllers"
		depends on SND_USB_CAIAQ
		help
		Say Y here to support input controllers like buttons, knobs,
		alpha dials and analog pedals on the following products:

		* Native Instruments RigKontrol2
		* Native Instruments Audio Kontrol 1

		endmenu

sound/usb/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -9,4 +9,4 @@ snd-usb-lib-objs := usbmidi.o
		obj-$(CONFIG_SND_USB_AUDIO) += snd-usb-audio.o snd-usb-lib.o
		obj-$(CONFIG_SND_USB_USX2Y) += snd-usb-lib.o

		obj-$(CONFIG_SND) += usx2y/
		obj-$(CONFIG_SND) += usx2y/ caiaq/

sound/usb/caiaq/Makefile

0 → 100644

+3 −0

Original line number	Diff line number	Diff line
		snd-usb-caiaq-objs := caiaq-device.o caiaq-audio.o caiaq-midi.o caiaq-input.o

		obj-$(CONFIG_SND_USB_CAIAQ) += snd-usb-caiaq.o

sound/usb/caiaq/caiaq-audio.c

0 → 100644

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Original line number	Diff line number	Diff line
		/*
		* 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);
		}