sound/soc/blackfin/bf5xx-tdm-pcm.c - maze/linux - Git at Google

 /*
  * File:         sound/soc/blackfin/bf5xx-tdm-pcm.c
  * Author:       Barry Song <Barry.Song@analog.com>
  *
  * Created:      Tue June 06 2009
  * Description:  DMA driver for tdm codec
  *
  * Modified:
  *               Copyright 2009 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * 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, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/gfp.h>

 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 #include <asm/dma.h>

 #include "bf5xx-tdm-pcm.h"
 #include "bf5xx-tdm.h"
 #include "bf5xx-sport.h"

 #define PCM_BUFFER_MAX  0x8000
 #define FRAGMENT_SIZE_MIN  (4*1024)
 #define FRAGMENTS_MIN  2
 #define FRAGMENTS_MAX  32

 static void bf5xx_dma_irq(void *data)
 {
 	struct snd_pcm_substream *pcm = data;
 	snd_pcm_period_elapsed(pcm);
 }

 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
 	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
 		SNDRV_PCM_INFO_RESUME),
 	.formats =          SNDRV_PCM_FMTBIT_S32_LE,
 	.rates =            SNDRV_PCM_RATE_48000,
 	.channels_min =     2,
 	.channels_max =     8,
 	.buffer_bytes_max = PCM_BUFFER_MAX,
 	.period_bytes_min = FRAGMENT_SIZE_MIN,
 	.period_bytes_max = PCM_BUFFER_MAX/2,
 	.periods_min =      FRAGMENTS_MIN,
 	.periods_max =      FRAGMENTS_MAX,
 };

 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params)
 {
 	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 	snd_pcm_lib_malloc_pages(substream, size * 4);

 	return 0;
 }

 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	snd_pcm_lib_free_pages(substream);

 	return 0;
 }

 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct sport_device *sport = runtime->private_data;
 	int fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);

 	fragsize_bytes /= runtime->channels;
 	/* inflate the fragsize to match the dma width of SPORT */
 	fragsize_bytes *= 8;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 		sport_config_tx_dma(sport, runtime->dma_area,
 			runtime->periods, fragsize_bytes);
 	} else {
 		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 		sport_config_rx_dma(sport, runtime->dma_area,
 			runtime->periods, fragsize_bytes);
 	}

 	return 0;
 }

 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct sport_device *sport = runtime->private_data;
 	int ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			sport_tx_start(sport);
 		else
 			sport_rx_start(sport);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			sport_tx_stop(sport);
 		else
 			sport_rx_stop(sport);
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct sport_device *sport = runtime->private_data;
 	unsigned int diff;
 	snd_pcm_uframes_t frames;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		diff = sport_curr_offset_tx(sport);
 		frames = diff / (8*4); /* 32 bytes per frame */
 	} else {
 		diff = sport_curr_offset_rx(sport);
 		frames = diff / (8*4);
 	}
 	return frames;
 }

 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_dma_buffer *buf = &substream->dma_buffer;

 	int ret = 0;

 	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);

 	ret = snd_pcm_hw_constraint_integer(runtime,
 		SNDRV_PCM_HW_PARAM_PERIODS);
 	if (ret < 0)
 		goto out;

 	if (sport_handle != NULL) {
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			sport_handle->tx_buf = buf->area;
 		else
 			sport_handle->rx_buf = buf->area;

 		runtime->private_data = sport_handle;
 	} else {
 		pr_err("sport_handle is NULL\n");
 		ret = -ENODEV;
 	}
 out:
 	return ret;
 }

 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
 	snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct sport_device *sport = runtime->private_data;
 	struct bf5xx_tdm_port *tdm_port = sport->private_data;
 	unsigned int *src;
 	unsigned int *dst;
 	int i;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		src = buf;
 		dst = (unsigned int *)substream->runtime->dma_area;

 		dst += pos * 8;
 		while (count--) {
 			for (i = 0; i < substream->runtime->channels; i++)
 				*(dst + tdm_port->tx_map[i]) = *src++;
 			dst += 8;
 		}
 	} else {
 		src = (unsigned int *)substream->runtime->dma_area;
 		dst = buf;

 		src += pos * 8;
 		while (count--) {
 			for (i = 0; i < substream->runtime->channels; i++)
 				*dst++ = *(src + tdm_port->rx_map[i]);
 			src += 8;
 		}
 	}

 	return 0;
 }

 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
 	int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
 {
 	unsigned char *buf = substream->runtime->dma_area;
 	buf += pos * 8 * 4;
 	memset(buf, '\0', count * 8 * 4);

 	return 0;
 }


 struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
 	.open           = bf5xx_pcm_open,
 	.ioctl          = snd_pcm_lib_ioctl,
 	.hw_params      = bf5xx_pcm_hw_params,
 	.hw_free        = bf5xx_pcm_hw_free,
 	.prepare        = bf5xx_pcm_prepare,
 	.trigger        = bf5xx_pcm_trigger,
 	.pointer        = bf5xx_pcm_pointer,
 	.copy           = bf5xx_pcm_copy,
 	.silence        = bf5xx_pcm_silence,
 };

 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 {
 	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 	struct snd_dma_buffer *buf = &substream->dma_buffer;
 	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;

 	buf->dev.type = SNDRV_DMA_TYPE_DEV;
 	buf->dev.dev = pcm->card->dev;
 	buf->private_data = NULL;
 	buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
 		&buf->addr, GFP_KERNEL);
 	if (!buf->area) {
 		pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
 		return -ENOMEM;
 	}
 	buf->bytes = size;

 	return 0;
 }

 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 {
 	struct snd_pcm_substream *substream;
 	struct snd_dma_buffer *buf;
 	int stream;

 	for (stream = 0; stream < 2; stream++) {
 		substream = pcm->streams[stream].substream;
 		if (!substream)
 			continue;

 		buf = &substream->dma_buffer;
 		if (!buf->area)
 			continue;
 		dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 		buf->area = NULL;
 	}
 }

 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);

 static int bf5xx_pcm_tdm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
 	struct snd_pcm *pcm = rtd->pcm;
 	int ret = 0;

 	if (!card->dev->dma_mask)
 		card->dev->dma_mask = &bf5xx_pcm_dmamask;
 	if (!card->dev->coherent_dma_mask)
 		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 			SNDRV_PCM_STREAM_PLAYBACK);
 		if (ret)
 			goto out;
 	}

 	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 			SNDRV_PCM_STREAM_CAPTURE);
 		if (ret)
 			goto out;
 	}
 out:
 	return ret;
 }

 static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
 	.ops        = &bf5xx_pcm_tdm_ops,
 	.pcm_new        = bf5xx_pcm_tdm_new,
 	.pcm_free       = bf5xx_pcm_free_dma_buffers,
 };

 static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
 {
 	return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
 }

 static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);
 	return 0;
 }

 static struct platform_driver bfin_tdm_driver = {
 	.driver = {
 			.name = "bfin-tdm-pcm-audio",
 			.owner = THIS_MODULE,
 	},

 	.probe = bf5xx_soc_platform_probe,
 	.remove = __devexit_p(bf5xx_soc_platform_remove),
 };

 module_platform_driver(bfin_tdm_driver);

 MODULE_AUTHOR("Barry Song");
 MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
 MODULE_LICENSE("GPL");
	/*
	* File: sound/soc/blackfin/bf5xx-tdm-pcm.c
	* Author: Barry Song <Barry.Song@analog.com>
	*
	* Created: Tue June 06 2009
	* Description: DMA driver for tdm codec
	*
	* Modified:
	* Copyright 2009 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* 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, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/dma-mapping.h>
	#include <linux/gfp.h>

	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	#include <asm/dma.h>

	#include "bf5xx-tdm-pcm.h"
	#include "bf5xx-tdm.h"
	#include "bf5xx-sport.h"

	#define PCM_BUFFER_MAX 0x8000
	#define FRAGMENT_SIZE_MIN (4*1024)
	#define FRAGMENTS_MIN 2
	#define FRAGMENTS_MAX 32

	static void bf5xx_dma_irq(void *data)
	{
	struct snd_pcm_substream *pcm = data;
	snd_pcm_period_elapsed(pcm);
	}

	static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	.info = (SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_RESUME),
	.formats = SNDRV_PCM_FMTBIT_S32_LE,
	.rates = SNDRV_PCM_RATE_48000,
	.channels_min = 2,
	.channels_max = 8,
	.buffer_bytes_max = PCM_BUFFER_MAX,
	.period_bytes_min = FRAGMENT_SIZE_MIN,
	.period_bytes_max = PCM_BUFFER_MAX/2,
	.periods_min = FRAGMENTS_MIN,
	.periods_max = FRAGMENTS_MAX,
	};

	static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	snd_pcm_lib_malloc_pages(substream, size * 4);

	return 0;
	}

	static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	snd_pcm_lib_free_pages(substream);

	return 0;
	}

	static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);

	fragsize_bytes /= runtime->channels;
	/* inflate the fragsize to match the dma width of SPORT */
	fragsize_bytes *= 8;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
	sport_config_tx_dma(sport, runtime->dma_area,
	runtime->periods, fragsize_bytes);
	} else {
	sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
	sport_config_rx_dma(sport, runtime->dma_area,
	runtime->periods, fragsize_bytes);
	}

	return 0;
	}

	static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	sport_tx_start(sport);
	else
	sport_rx_start(sport);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	sport_tx_stop(sport);
	else
	sport_rx_stop(sport);
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	unsigned int diff;
	snd_pcm_uframes_t frames;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	diff = sport_curr_offset_tx(sport);
	frames = diff / (84); / 32 bytes per frame */
	} else {
	diff = sport_curr_offset_rx(sport);
	frames = diff / (8*4);
	}
	return frames;
	}

	static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = &substream->dma_buffer;

	int ret = 0;

	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);

	ret = snd_pcm_hw_constraint_integer(runtime,
	SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
	goto out;

	if (sport_handle != NULL) {
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	sport_handle->tx_buf = buf->area;
	else
	sport_handle->rx_buf = buf->area;

	runtime->private_data = sport_handle;
	} else {
	pr_err("sport_handle is NULL\n");
	ret = -ENODEV;
	}
	out:
	return ret;
	}

	static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
	snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	struct bf5xx_tdm_port *tdm_port = sport->private_data;
	unsigned int *src;
	unsigned int *dst;
	int i;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	src = buf;
	dst = (unsigned int *)substream->runtime->dma_area;

	dst += pos * 8;
	while (count--) {
	for (i = 0; i < substream->runtime->channels; i++)
	(dst + tdm_port->tx_map[i]) = src++;
	dst += 8;
	}
	} else {
	src = (unsigned int *)substream->runtime->dma_area;
	dst = buf;

	src += pos * 8;
	while (count--) {
	for (i = 0; i < substream->runtime->channels; i++)
	dst++ = (src + tdm_port->rx_map[i]);
	src += 8;
	}
	}

	return 0;
	}

	static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
	int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
	{
	unsigned char *buf = substream->runtime->dma_area;
	buf += pos * 8 * 4;
	memset(buf, '\0', count * 8 * 4);

	return 0;
	}


	struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
	.open = bf5xx_pcm_open,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = bf5xx_pcm_hw_params,
	.hw_free = bf5xx_pcm_hw_free,
	.prepare = bf5xx_pcm_prepare,
	.trigger = bf5xx_pcm_trigger,
	.pointer = bf5xx_pcm_pointer,
	.copy = bf5xx_pcm_copy,
	.silence = bf5xx_pcm_silence,
	};

	static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
	&buf->addr, GFP_KERNEL);
	if (!buf->area) {
	pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
	return -ENOMEM;
	}
	buf->bytes = size;

	return 0;
	}

	static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;

	for (stream = 0; stream < 2; stream++) {
	substream = pcm->streams[stream].substream;
	if (!substream)
	continue;

	buf = &substream->dma_buffer;
	if (!buf->area)
	continue;
	dma_free_coherent(NULL, buf->bytes, buf->area, 0);
	buf->area = NULL;
	}
	}

	static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);

	static int bf5xx_pcm_tdm_new(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	if (!card->dev->dma_mask)
	card->dev->dma_mask = &bf5xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	SNDRV_PCM_STREAM_PLAYBACK);
	if (ret)
	goto out;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	SNDRV_PCM_STREAM_CAPTURE);
	if (ret)
	goto out;
	}
	out:
	return ret;
	}

	static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
	.ops = &bf5xx_pcm_tdm_ops,
	.pcm_new = bf5xx_pcm_tdm_new,
	.pcm_free = bf5xx_pcm_free_dma_buffers,
	};

	static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
	{
	return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
	}

	static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
	}

	static struct platform_driver bfin_tdm_driver = {
	.driver = {
	.name = "bfin-tdm-pcm-audio",
	.owner = THIS_MODULE,
	},

	.probe = bf5xx_soc_platform_probe,
	.remove = __devexit_p(bf5xx_soc_platform_remove),
	};

	module_platform_driver(bfin_tdm_driver);

	MODULE_AUTHOR("Barry Song");
	MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
	MODULE_LICENSE("GPL");