[deliverable/linux.git] / sound / soc / atmel / sam9g20_wm8731.c

/*
 * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
 * 			ATMEL AT91SAM9G20ek board.
 *
 *  Copyright (C) 2005 SAN People
 *  Copyright (C) 2008 Atmel
 *
 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
 *
 * Based on ati_b1_wm8731.c by:
 * Frank Mandarino <fmandarino@endrelia.com>
 * Copyright 2006 Endrelia Technologies Inc.
 * Based on corgi.c by:
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 *
 * 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/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

#include <linux/atmel-ssc.h>

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

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/gpio.h>

#include "../codecs/wm8731.h"
#include "atmel-pcm.h"
#include "atmel_ssc_dai.h"

#define MCLK_RATE 12000000

/*
 * As shipped the board does not have inputs.  However, it is relatively
 * straightforward to modify the board to hook them up so support is left
 * in the driver.
 */
#undef ENABLE_MIC_INPUT

static struct clk *mclk;

static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	int ret;

	/* set codec DAI configuration */
	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
	if (ret < 0)
		return ret;

	/* set cpu DAI configuration */
	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
	if (ret < 0)
		return ret;

	return 0;
}

static struct snd_soc_ops at91sam9g20ek_ops = {
	.hw_params = at91sam9g20ek_hw_params,
};

static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
					enum snd_soc_bias_level level)
{
	static int mclk_on;
	int ret = 0;

	switch (level) {
	case SND_SOC_BIAS_ON:
	case SND_SOC_BIAS_PREPARE:
		if (!mclk_on)
			ret = clk_enable(mclk);
		if (ret == 0)
			mclk_on = 1;
		break;

	case SND_SOC_BIAS_OFF:
	case SND_SOC_BIAS_STANDBY:
		if (mclk_on)
			clk_disable(mclk);
		mclk_on = 0;
		break;
	}

	return ret;
}

static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
	SND_SOC_DAPM_MIC("Int Mic", NULL),
	SND_SOC_DAPM_SPK("Ext Spk", NULL),
};

static const struct snd_soc_dapm_route intercon[] = {

	/* speaker connected to LHPOUT */
	{"Ext Spk", NULL, "LHPOUT"},

	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
	{"MICIN", NULL, "Mic Bias"},
	{"Mic Bias", NULL, "Int Mic"},
};

/*
 * Logic for a wm8731 as connected on a at91sam9g20ek board.
 */
static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
{
	struct snd_soc_dai *codec_dai = &codec->dai[0];
	int ret;

	printk(KERN_DEBUG
			"at91sam9g20ek_wm8731 "
			": at91sam9g20ek_wm8731_init() called\n");

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
		MCLK_RATE, SND_SOC_CLOCK_IN);
	if (ret < 0) {
		printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
		return ret;
	}

	/* Add specific widgets */
	snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
				  ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
	/* Set up specific audio path interconnects */
	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

	/* not connected */
	snd_soc_dapm_nc_pin(codec, "RLINEIN");
	snd_soc_dapm_nc_pin(codec, "LLINEIN");

#ifdef ENABLE_MIC_INPUT
	snd_soc_dapm_enable_pin(codec, "Int Mic");
#else
	snd_soc_dapm_nc_pin(codec, "Int Mic");
#endif

	/* always connected */
	snd_soc_dapm_enable_pin(codec, "Ext Spk");

	snd_soc_dapm_sync(codec);

	return 0;
}

static struct snd_soc_dai_link at91sam9g20ek_dai = {
	.name = "WM8731",
	.stream_name = "WM8731 PCM",
	.cpu_dai = &atmel_ssc_dai[0],
	.codec_dai = &wm8731_dai,
	.init = at91sam9g20ek_wm8731_init,
	.ops = &at91sam9g20ek_ops,
};

static struct snd_soc_card snd_soc_at91sam9g20ek = {
	.name = "AT91SAMG20-EK",
	.platform = &atmel_soc_platform,
	.dai_link = &at91sam9g20ek_dai,
	.num_links = 1,
	.set_bias_level = at91sam9g20ek_set_bias_level,
};

/*
 * FIXME: This is a temporary bodge to avoid cross-tree merge issues.
 * New drivers should register the wm8731 I2C device in the machine
 * setup code (under arch/arm for ARM systems).
 */
static int wm8731_i2c_register(void)
{
	struct i2c_board_info info;
	struct i2c_adapter *adapter;
	struct i2c_client *client;

	memset(&info, 0, sizeof(struct i2c_board_info));
	info.addr = 0x1b;
	strlcpy(info.type, "wm8731", I2C_NAME_SIZE);

	adapter = i2c_get_adapter(0);
	if (!adapter) {
		printk(KERN_ERR "can't get i2c adapter 0\n");
		return -ENODEV;
	}

	client = i2c_new_device(adapter, &info);
	i2c_put_adapter(adapter);
	if (!client) {
		printk(KERN_ERR "can't add i2c device at 0x%x\n",
			(unsigned int)info.addr);
		return -ENODEV;
	}

	return 0;
}

static struct snd_soc_device at91sam9g20ek_snd_devdata = {
	.card = &snd_soc_at91sam9g20ek,
	.codec_dev = &soc_codec_dev_wm8731,
};

static struct platform_device *at91sam9g20ek_snd_device;

static int __init at91sam9g20ek_init(void)
{
	struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
	struct ssc_device *ssc = NULL;
	struct clk *pllb;
	int ret;

	if (!machine_is_at91sam9g20ek())
		return -ENODEV;

	/*
	 * Codec MCLK is supplied by PCK0 - set it up.
	 */
	mclk = clk_get(NULL, "pck0");
	if (IS_ERR(mclk)) {
		printk(KERN_ERR "ASoC: Failed to get MCLK\n");
		ret = PTR_ERR(mclk);
		goto err;
	}

	pllb = clk_get(NULL, "pllb");
	if (IS_ERR(mclk)) {
		printk(KERN_ERR "ASoC: Failed to get PLLB\n");
		ret = PTR_ERR(mclk);
		goto err_mclk;
	}
	ret = clk_set_parent(mclk, pllb);
	clk_put(pllb);
	if (ret != 0) {
		printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
		goto err_mclk;
	}

	clk_set_rate(mclk, MCLK_RATE);

	/*
	 * Request SSC device
	 */
	ssc = ssc_request(0);
	if (IS_ERR(ssc)) {
		printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
		ret = PTR_ERR(ssc);
		ssc = NULL;
		goto err_ssc;
	}
	ssc_p->ssc = ssc;

	ret = wm8731_i2c_register();
	if (ret != 0)
		goto err_ssc;

	at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
	if (!at91sam9g20ek_snd_device) {
		printk(KERN_ERR "ASoC: Platform device allocation failed\n");
		ret = -ENOMEM;
	}

	platform_set_drvdata(at91sam9g20ek_snd_device,
			&at91sam9g20ek_snd_devdata);
	at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;

	ret = platform_device_add(at91sam9g20ek_snd_device);
	if (ret) {
		printk(KERN_ERR "ASoC: Platform device allocation failed\n");
		platform_device_put(at91sam9g20ek_snd_device);
	}

	return ret;

err_ssc:
	ssc_free(ssc);
	ssc_p->ssc = NULL;
err_mclk:
	clk_put(mclk);
	mclk = NULL;
err:
	return ret;
}

static void __exit at91sam9g20ek_exit(void)
{
	struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
	struct ssc_device *ssc;

	if (ssc_p != NULL) {
		ssc = ssc_p->ssc;
		if (ssc != NULL)
			ssc_free(ssc);
		ssc_p->ssc = NULL;
	}

	platform_device_unregister(at91sam9g20ek_snd_device);
	at91sam9g20ek_snd_device = NULL;
	clk_put(mclk);
	mclk = NULL;
}

module_init(at91sam9g20ek_init);
module_exit(at91sam9g20ek_exit);

/* Module information */
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
MODULE_LICENSE("GPL");
Commit	Line	Data
5b99e6cc SG	1	/*
	2	* sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
	3	* ATMEL AT91SAM9G20ek board.
	4	*
	5	* Copyright (C) 2005 SAN People
	6	* Copyright (C) 2008 Atmel
	7	*
	8	* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
	9	*
	10	* Based on ati_b1_wm8731.c by:
	11	* Frank Mandarino <fmandarino@endrelia.com>
	12	* Copyright 2006 Endrelia Technologies Inc.
	13	* Based on corgi.c by:
	14	* Copyright 2005 Wolfson Microelectronics PLC.
	15	* Copyright 2005 Openedhand Ltd.
	16	*
	17	* This program is free software; you can redistribute it and/or modify
	18	* it under the terms of the GNU General Public License as published by
	19	* the Free Software Foundation; either version 2 of the License, or
	20	* (at your option) any later version.
	21	*
	22	* This program is distributed in the hope that it will be useful,
	23	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	24	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	25	* GNU General Public License for more details.
	26	*
	27	* You should have received a copy of the GNU General Public License
	28	* along with this program; if not, write to the Free Software
	29	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	30	*/
	31
	32	#include <linux/module.h>
	33	#include <linux/moduleparam.h>
5b99e6cc SG	34	#include <linux/kernel.h>
	35	#include <linux/clk.h>
	36	#include <linux/timer.h>
	37	#include <linux/interrupt.h>
	38	#include <linux/platform_device.h>
5998102b	39	#include <linux/i2c.h>
5b99e6cc SG	40
	41	#include <linux/atmel-ssc.h>
	42
	43	#include <sound/core.h>
	44	#include <sound/pcm.h>
	45	#include <sound/pcm_params.h>
	46	#include <sound/soc.h>
	47	#include <sound/soc-dapm.h>
	48
40135ea0	49	#include <asm/mach-types.h>
5b99e6cc SG	50	#include <mach/hardware.h>
	51	#include <mach/gpio.h>
	52
	53	#include "../codecs/wm8731.h"
	54	#include "atmel-pcm.h"
	55	#include "atmel_ssc_dai.h"
	56
5de7f9b2 MB	57	#define MCLK_RATE 12000000
5de7f9b2 MB	58
22df8eb4 MB	59	/*
	60	* As shipped the board does not have inputs. However, it is relatively
	61	* straightforward to modify the board to hook them up so support is left
	62	* in the driver.
	63	*/
	64	#undef ENABLE_MIC_INPUT
	65
5de7f9b2	66	static struct clk *mclk;
5b99e6cc	67
5b99e6cc SG	68	static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
	69	struct snd_pcm_hw_params *params)
	70	{
	71	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	72	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
	73	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
5b99e6cc SG	74	int ret;
5b99e6cc SG	75
5b99e6cc SG	76	/* set codec DAI configuration */
5b99e6cc SG	77	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S \|
2a01e5f3	78	SND_SOC_DAIFMT_NB_NF \| SND_SOC_DAIFMT_CBM_CFM);
5b99e6cc SG	79	if (ret < 0)
	80	return ret;
	81
	82	/* set cpu DAI configuration */
	83	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S \|
2a01e5f3	84	SND_SOC_DAIFMT_NB_NF \| SND_SOC_DAIFMT_CBM_CFM);
5b99e6cc SG	85	if (ret < 0)
	86	return ret;
	87
	88	return 0;
	89	}
	90
	91	static struct snd_soc_ops at91sam9g20ek_ops = {
5b99e6cc	92	.hw_params = at91sam9g20ek_hw_params,
5b99e6cc SG	93	};
5b99e6cc SG	94
5de7f9b2 MB	95	static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
	96	enum snd_soc_bias_level level)
	97	{
	98	static int mclk_on;
	99	int ret = 0;
	100
	101	switch (level) {
	102	case SND_SOC_BIAS_ON:
	103	case SND_SOC_BIAS_PREPARE:
	104	if (!mclk_on)
	105	ret = clk_enable(mclk);
	106	if (ret == 0)
	107	mclk_on = 1;
	108	break;
	109
	110	case SND_SOC_BIAS_OFF:
	111	case SND_SOC_BIAS_STANDBY:
	112	if (mclk_on)
	113	clk_disable(mclk);
	114	mclk_on = 0;
	115	break;
	116	}
	117
	118	return ret;
	119	}
5b99e6cc SG	120
	121	static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
	122	SND_SOC_DAPM_MIC("Int Mic", NULL),
	123	SND_SOC_DAPM_SPK("Ext Spk", NULL),
	124	};
	125
	126	static const struct snd_soc_dapm_route intercon[] = {
	127
	128	/* speaker connected to LHPOUT */
	129	{"Ext Spk", NULL, "LHPOUT"},
	130
	131	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
	132	{"MICIN", NULL, "Mic Bias"},
	133	{"Mic Bias", NULL, "Int Mic"},
	134	};
	135
	136	/*
	137	* Logic for a wm8731 as connected on a at91sam9g20ek board.
	138	*/
	139	static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
	140	{
96fd6d47 MB	141	struct snd_soc_dai *codec_dai = &codec->dai[0];
	142	int ret;
	143
5b99e6cc SG	144	printk(KERN_DEBUG
	145	"at91sam9g20ek_wm8731 "
	146	": at91sam9g20ek_wm8731_init() called\n");
	147
96fd6d47 MB	148	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
	149	MCLK_RATE, SND_SOC_CLOCK_IN);
	150	if (ret < 0) {
	151	printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
	152	return ret;
	153	}
	154
5b99e6cc SG	155	/* Add specific widgets */
	156	snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
	157	ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
	158	/* Set up specific audio path interconnects */
	159	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
	160
	161	/* not connected */
8c0bad7f MB	162	snd_soc_dapm_nc_pin(codec, "RLINEIN");
8c0bad7f MB	163	snd_soc_dapm_nc_pin(codec, "LLINEIN");
5b99e6cc	164
22df8eb4	165	#ifdef ENABLE_MIC_INPUT
5b99e6cc	166	snd_soc_dapm_enable_pin(codec, "Int Mic");
22df8eb4 MB	167	#else
	168	snd_soc_dapm_nc_pin(codec, "Int Mic");
	169	#endif
	170
	171	/* always connected */
5b99e6cc SG	172	snd_soc_dapm_enable_pin(codec, "Ext Spk");
	173
	174	snd_soc_dapm_sync(codec);
	175
	176	return 0;
	177	}
	178
	179	static struct snd_soc_dai_link at91sam9g20ek_dai = {
	180	.name = "WM8731",
	181	.stream_name = "WM8731 PCM",
	182	.cpu_dai = &atmel_ssc_dai[0],
	183	.codec_dai = &wm8731_dai,
	184	.init = at91sam9g20ek_wm8731_init,
	185	.ops = &at91sam9g20ek_ops,
	186	};
	187
87506549	188	static struct snd_soc_card snd_soc_at91sam9g20ek = {
7ee75380	189	.name = "AT91SAMG20-EK",
87689d56	190	.platform = &atmel_soc_platform,
5b99e6cc SG	191	.dai_link = &at91sam9g20ek_dai,
5b99e6cc SG	192	.num_links = 1,
5de7f9b2	193	.set_bias_level = at91sam9g20ek_set_bias_level,
5b99e6cc SG	194	};
5b99e6cc SG	195
5998102b MB	196	/*
	197	* FIXME: This is a temporary bodge to avoid cross-tree merge issues.
	198	* New drivers should register the wm8731 I2C device in the machine
	199	* setup code (under arch/arm for ARM systems).
	200	*/
	201	static int wm8731_i2c_register(void)
	202	{
	203	struct i2c_board_info info;
	204	struct i2c_adapter *adapter;
	205	struct i2c_client *client;
	206
	207	memset(&info, 0, sizeof(struct i2c_board_info));
	208	info.addr = 0x1b;
	209	strlcpy(info.type, "wm8731", I2C_NAME_SIZE);
	210
	211	adapter = i2c_get_adapter(0);
	212	if (!adapter) {
	213	printk(KERN_ERR "can't get i2c adapter 0\n");
	214	return -ENODEV;
	215	}
	216
	217	client = i2c_new_device(adapter, &info);
	218	i2c_put_adapter(adapter);
	219	if (!client) {
	220	printk(KERN_ERR "can't add i2c device at 0x%x\n",
	221	(unsigned int)info.addr);
	222	return -ENODEV;
	223	}
	224
	225	return 0;
	226	}
5b99e6cc SG	227
5b99e6cc SG	228	static struct snd_soc_device at91sam9g20ek_snd_devdata = {
87506549	229	.card = &snd_soc_at91sam9g20ek,
5b99e6cc	230	.codec_dev = &soc_codec_dev_wm8731,
5b99e6cc SG	231	};
	232
	233	static struct platform_device *at91sam9g20ek_snd_device;
	234
	235	static int __init at91sam9g20ek_init(void)
	236	{
	237	struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
	238	struct ssc_device *ssc = NULL;
5de7f9b2	239	struct clk *pllb;
5b99e6cc SG	240	int ret;
5b99e6cc SG	241
40135ea0 MB	242	if (!machine_is_at91sam9g20ek())
	243	return -ENODEV;
	244
5de7f9b2 MB	245	/*
	246	* Codec MCLK is supplied by PCK0 - set it up.
	247	*/
	248	mclk = clk_get(NULL, "pck0");
	249	if (IS_ERR(mclk)) {
	250	printk(KERN_ERR "ASoC: Failed to get MCLK\n");
	251	ret = PTR_ERR(mclk);
	252	goto err;
	253	}
	254
	255	pllb = clk_get(NULL, "pllb");
	256	if (IS_ERR(mclk)) {
	257	printk(KERN_ERR "ASoC: Failed to get PLLB\n");
	258	ret = PTR_ERR(mclk);
	259	goto err_mclk;
	260	}
	261	ret = clk_set_parent(mclk, pllb);
	262	clk_put(pllb);
	263	if (ret != 0) {
	264	printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
	265	goto err_mclk;
	266	}
	267
	268	clk_set_rate(mclk, MCLK_RATE);
	269
5b99e6cc SG	270	/*
	271	* Request SSC device
	272	*/
	273	ssc = ssc_request(0);
	274	if (IS_ERR(ssc)) {
d6943541	275	printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
5b99e6cc SG	276	ret = PTR_ERR(ssc);
	277	ssc = NULL;
	278	goto err_ssc;
	279	}
	280	ssc_p->ssc = ssc;
	281
5998102b MB	282	ret = wm8731_i2c_register();
	283	if (ret != 0)
	284	goto err_ssc;
	285
5b99e6cc SG	286	at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
5b99e6cc SG	287	if (!at91sam9g20ek_snd_device) {
d6943541	288	printk(KERN_ERR "ASoC: Platform device allocation failed\n");
5b99e6cc SG	289	ret = -ENOMEM;
	290	}
	291
	292	platform_set_drvdata(at91sam9g20ek_snd_device,
	293	&at91sam9g20ek_snd_devdata);
	294	at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
	295
	296	ret = platform_device_add(at91sam9g20ek_snd_device);
	297	if (ret) {
d6943541	298	printk(KERN_ERR "ASoC: Platform device allocation failed\n");
5b99e6cc SG	299	platform_device_put(at91sam9g20ek_snd_device);
	300	}
	301
	302	return ret;
	303
	304	err_ssc:
5998102b MB	305	ssc_free(ssc);
5998102b MB	306	ssc_p->ssc = NULL;
5de7f9b2 MB	307	err_mclk:
	308	clk_put(mclk);
	309	mclk = NULL;
	310	err:
5b99e6cc SG	311	return ret;
	312	}
	313
	314	static void __exit at91sam9g20ek_exit(void)
	315	{
	316	struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
	317	struct ssc_device *ssc;
	318
	319	if (ssc_p != NULL) {
	320	ssc = ssc_p->ssc;
	321	if (ssc != NULL)
	322	ssc_free(ssc);
	323	ssc_p->ssc = NULL;
	324	}
	325
	326	platform_device_unregister(at91sam9g20ek_snd_device);
	327	at91sam9g20ek_snd_device = NULL;
5de7f9b2 MB	328	clk_put(mclk);
5de7f9b2 MB	329	mclk = NULL;
5b99e6cc SG	330	}
	331
	332	module_init(at91sam9g20ek_init);
	333	module_exit(at91sam9g20ek_exit);
	334
	335	/* Module information */
	336	MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
	337	MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
	338	MODULE_LICENSE("GPL");