[deliverable/linux.git] / sound / soc / blackfin / bf5xx-i2s-pcm.c

/*
 * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
 * Author:       Cliff Cai <Cliff.Cai@analog.com>
 *
 * Created:      Tue June 06 2008
 * Description:  DMA driver for i2s codec
 *
 * Modified:
 *               Copyright 2008 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-i2s-pcm.h"
#include "bf5xx-sport.h"

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_MMAP |
				   SNDRV_PCM_INFO_MMAP_VALID |
				   SNDRV_PCM_INFO_BLOCK_TRANSFER,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
				   SNDRV_PCM_FMTBIT_S24_LE |
				   SNDRV_PCM_FMTBIT_S32_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 0x10000,
	.periods_min		= 1,
	.periods_max		= PAGE_SIZE/32,
	.buffer_bytes_max	= 0x20000, /* 128 kbytes */
	.fifo_size		= 16,
};

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);

	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 period_bytes = frames_to_bytes(runtime, runtime->period_size);

	pr_debug("%s enter\n", __func__);
	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, period_bytes);
	} else {
		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_rx_dma(sport, runtime->dma_area,
			runtime->periods, period_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;

	pr_debug("%s enter\n", __func__);
	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;
	pr_debug("%s enter\n", __func__);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		diff = sport_curr_offset_tx(sport);
		frames = bytes_to_frames(substream->runtime, diff);
	} else {
		diff = sport_curr_offset_rx(sport);
		frames = bytes_to_frames(substream->runtime, diff);
	}
	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;

	pr_debug("%s enter\n", __func__);

	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");
		return -1;
	}
	return 0;

 out:
	return ret;
}

static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	size_t size = vma->vm_end - vma->vm_start;
	vma->vm_start = (unsigned long)runtime->dma_area;
	vma->vm_end = vma->vm_start + size;
	vma->vm_flags |=  VM_SHARED;

	return 0 ;
}

static struct snd_pcm_ops bf5xx_pcm_i2s_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,
	.mmap		= bf5xx_pcm_mmap,
};

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,
			&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;

	pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
		buf->area, buf->bytes);

	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);

int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	pr_debug("%s enter\n", __func__);
	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 (dai->driver->playback.channels_min) {
		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->driver->capture.channels_min) {
		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_i2s_soc_platform = {
	.ops		= &bf5xx_pcm_i2s_ops,
	.pcm_new	= bf5xx_pcm_i2s_new,
	.pcm_free	= bf5xx_pcm_free_dma_buffers,
};

static int __devinit bfin_i2s_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
}

static int __devexit bfin_i2s_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver bfin_i2s_pcm_driver = {
	.driver = {
		.name = "bfin-i2s-pcm-audio",
		.owner = THIS_MODULE,
	},

	.probe = bfin_i2s_soc_platform_probe,
	.remove = __devexit_p(bfin_i2s_soc_platform_remove),
};

static int __init snd_bfin_i2s_pcm_init(void)
{
	return platform_driver_register(&bfin_i2s_pcm_driver);
}
module_init(snd_bfin_i2s_pcm_init);

static void __exit snd_bfin_i2s_pcm_exit(void)
{
	platform_driver_unregister(&bfin_i2s_pcm_driver);
}
module_exit(snd_bfin_i2s_pcm_exit);

MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
88740da1 CC	1	/*
	2	* File: sound/soc/blackfin/bf5xx-i2s-pcm.c
	3	* Author: Cliff Cai <Cliff.Cai@analog.com>
	4	*
	5	* Created: Tue June 06 2008
	6	* Description: DMA driver for i2s codec
	7	*
	8	* Modified:
	9	* Copyright 2008 Analog Devices Inc.
	10	*
	11	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, see the file COPYING, or write
	25	* to the Free Software Foundation, Inc.,
	26	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/platform_device.h>
88740da1	32	#include <linux/dma-mapping.h>
5a0e3ad6	33	#include <linux/gfp.h>
88740da1 CC	34
	35	#include <sound/core.h>
	36	#include <sound/pcm.h>
	37	#include <sound/pcm_params.h>
	38	#include <sound/soc.h>
	39
	40	#include <asm/dma.h>
	41
	42	#include "bf5xx-i2s-pcm.h"
88740da1 CC	43	#include "bf5xx-sport.h"
	44
	45	static void bf5xx_dma_irq(void *data)
	46	{
	47	struct snd_pcm_substream *pcm = data;
	48	snd_pcm_period_elapsed(pcm);
	49	}
	50
	51	static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	52	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	53	SNDRV_PCM_INFO_MMAP \|
	54	SNDRV_PCM_INFO_MMAP_VALID \|
	55	SNDRV_PCM_INFO_BLOCK_TRANSFER,
	56	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	57	SNDRV_PCM_FMTBIT_S24_LE \|
	58	SNDRV_PCM_FMTBIT_S32_LE,
	59	.period_bytes_min = 32,
	60	.period_bytes_max = 0x10000,
	61	.periods_min = 1,
	62	.periods_max = PAGE_SIZE/32,
	63	.buffer_bytes_max = 0x20000, /* 128 kbytes */
	64	.fifo_size = 16,
	65	};
	66
	67	static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	68	struct snd_pcm_hw_params *params)
	69	{
	70	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	71	snd_pcm_lib_malloc_pages(substream, size);
	72
	73	return 0;
	74	}
	75
	76	static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
	77	{
	78	snd_pcm_lib_free_pages(substream);
	79
	80	return 0;
	81	}
	82
	83	static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
	84	{
	85	struct snd_pcm_runtime *runtime = substream->runtime;
	86	struct sport_device *sport = runtime->private_data;
	87	int period_bytes = frames_to_bytes(runtime, runtime->period_size);
	88
	89	pr_debug("%s enter\n", __func__);
	90	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	91	sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
	92	sport_config_tx_dma(sport, runtime->dma_area,
	93	runtime->periods, period_bytes);
	94	} else {
	95	sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
	96	sport_config_rx_dma(sport, runtime->dma_area,
	97	runtime->periods, period_bytes);
	98	}
	99
	100	return 0;
	101	}
	102
	103	static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	104	{
	105	struct snd_pcm_runtime *runtime = substream->runtime;
	106	struct sport_device *sport = runtime->private_data;
107	int ret = 0;
108
109	pr_debug("%s enter\n", __func__);
110	switch (cmd) {
111	case SNDRV_PCM_TRIGGER_START:
112	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
113	sport_tx_start(sport);
114	else
115	sport_rx_start(sport);
116	break;
117	case SNDRV_PCM_TRIGGER_STOP:
118	case SNDRV_PCM_TRIGGER_SUSPEND:
119	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
120	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
121	sport_tx_stop(sport);
122	else
123	sport_rx_stop(sport);
124	break;
125	default:
126	ret = -EINVAL;
127	}
128
129	return ret;
130	}
131
132	static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
133	{
134	struct snd_pcm_runtime *runtime = substream->runtime;
135	struct sport_device *sport = runtime->private_data;
136	unsigned int diff;
137	snd_pcm_uframes_t frames;
138	pr_debug("%s enter\n", __func__);
139	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
140	diff = sport_curr_offset_tx(sport);
141	frames = bytes_to_frames(substream->runtime, diff);
142	} else {
143	diff = sport_curr_offset_rx(sport);
144	frames = bytes_to_frames(substream->runtime, diff);
145	}
146	return frames;
147	}
148
149	static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
150	{
2c66cb99 BS	151	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	152	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	153	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
88740da1	154	struct snd_pcm_runtime *runtime = substream->runtime;
2c66cb99	155	struct snd_dma_buffer *buf = &substream->dma_buffer;
88740da1 CC	156	int ret;
	157
	158	pr_debug("%s enter\n", __func__);
2c66cb99	159
88740da1 CC	160	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
88740da1 CC	161
b83e60c0	162	ret = snd_pcm_hw_constraint_integer(runtime,
88740da1 CC	163	SNDRV_PCM_HW_PARAM_PERIODS);
	164	if (ret < 0)
	165	goto out;
	166
2c66cb99 BS	167	if (sport_handle != NULL) {
	168	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	169	sport_handle->tx_buf = buf->area;
	170	else
	171	sport_handle->rx_buf = buf->area;
	172
88740da1	173	runtime->private_data = sport_handle;
2c66cb99	174	} else {
88740da1 CC	175	pr_err("sport_handle is NULL\n");
	176	return -1;
	177	}
	178	return 0;
	179
	180	out:
	181	return ret;
	182	}
	183
	184	static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
	185	struct vm_area_struct *vma)
	186	{
	187	struct snd_pcm_runtime *runtime = substream->runtime;
	188	size_t size = vma->vm_end - vma->vm_start;
	189	vma->vm_start = (unsigned long)runtime->dma_area;
	190	vma->vm_end = vma->vm_start + size;
	191	vma->vm_flags \|= VM_SHARED;
	192
	193	return 0 ;
	194	}
	195
b2a19d02	196	static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
88740da1 CC	197	.open = bf5xx_pcm_open,
	198	.ioctl = snd_pcm_lib_ioctl,
	199	.hw_params = bf5xx_pcm_hw_params,
	200	.hw_free = bf5xx_pcm_hw_free,
	201	.prepare = bf5xx_pcm_prepare,
	202	.trigger = bf5xx_pcm_trigger,
	203	.pointer = bf5xx_pcm_pointer,
	204	.mmap = bf5xx_pcm_mmap,
	205	};
	206
	207	static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	208	{
	209	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	210	struct snd_dma_buffer *buf = &substream->dma_buffer;
	211	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	212
	213	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	214	buf->dev.dev = pcm->card->dev;
	215	buf->private_data = NULL;
	216	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	217	&buf->addr, GFP_KERNEL);
	218	if (!buf->area) {
2f1ff661	219	pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
88740da1 CC	220	return -ENOMEM;
	221	}
	222	buf->bytes = size;
	223
	224	pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
	225	buf->area, buf->bytes);
	226
88740da1 CC	227	return 0;
	228	}
	229
	230	static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	231	{
	232	struct snd_pcm_substream *substream;
	233	struct snd_dma_buffer *buf;
	234	int stream;
	235
	236	for (stream = 0; stream < 2; stream++) {
	237	substream = pcm->streams[stream].substream;
	238	if (!substream)
	239	continue;
	240
	241	buf = &substream->dma_buffer;
	242	if (!buf->area)
	243	continue;
	244	dma_free_coherent(NULL, buf->bytes, buf->area, 0);
	245	buf->area = NULL;
	246	}
88740da1 CC	247	}
88740da1 CC	248
284901a9	249	static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
88740da1	250
552d1ef6	251	int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
88740da1	252	{
552d1ef6 LG	253	struct snd_card *card = rtd->card->snd_card;
	254	struct snd_soc_dai *dai = rtd->cpu_dai;
	255	struct snd_pcm *pcm = rtd->pcm;
88740da1 CC	256	int ret = 0;
	257
	258	pr_debug("%s enter\n", __func__);
	259	if (!card->dev->dma_mask)
	260	card->dev->dma_mask = &bf5xx_pcm_dmamask;
	261	if (!card->dev->coherent_dma_mask)
284901a9	262	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
88740da1	263
f0fba2ad	264	if (dai->driver->playback.channels_min) {
88740da1 CC	265	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	266	SNDRV_PCM_STREAM_PLAYBACK);
	267	if (ret)
	268	goto out;
	269	}
	270
f0fba2ad	271	if (dai->driver->capture.channels_min) {
88740da1 CC	272	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	273	SNDRV_PCM_STREAM_CAPTURE);
	274	if (ret)
	275	goto out;
	276	}
	277	out:
	278	return ret;
	279	}
	280
f0fba2ad LG	281	static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
f0fba2ad LG	282	.ops = &bf5xx_pcm_i2s_ops,
88740da1 CC	283	.pcm_new = bf5xx_pcm_i2s_new,
	284	.pcm_free = bf5xx_pcm_free_dma_buffers,
	285	};
88740da1	286
f0fba2ad	287	static int __devinit bfin_i2s_soc_platform_probe(struct platform_device *pdev)
958e792c	288	{
f0fba2ad	289	return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
958e792c	290	}
958e792c	291
f0fba2ad	292	static int __devexit bfin_i2s_soc_platform_remove(struct platform_device *pdev)
958e792c	293	{
f0fba2ad LG	294	snd_soc_unregister_platform(&pdev->dev);
	295	return 0;
	296	}
	297
	298	static struct platform_driver bfin_i2s_pcm_driver = {
	299	.driver = {
b83e60c0 MB	300	.name = "bfin-i2s-pcm-audio",
b83e60c0 MB	301	.owner = THIS_MODULE,
f0fba2ad LG	302	},
	303
	304	.probe = bfin_i2s_soc_platform_probe,
	305	.remove = __devexit_p(bfin_i2s_soc_platform_remove),
	306	};
	307
	308	static int __init snd_bfin_i2s_pcm_init(void)
	309	{
	310	return platform_driver_register(&bfin_i2s_pcm_driver);
	311	}
	312	module_init(snd_bfin_i2s_pcm_init);
	313
	314	static void __exit snd_bfin_i2s_pcm_exit(void)
	315	{
	316	platform_driver_unregister(&bfin_i2s_pcm_driver);
958e792c	317	}
f0fba2ad	318	module_exit(snd_bfin_i2s_pcm_exit);
958e792c	319
88740da1 CC	320	MODULE_AUTHOR("Cliff Cai");
	321	MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
	322	MODULE_LICENSE("GPL");