Release 4.7 sound/soc/atmel/atmel-classd.c

Directory: sound/soc/atmel
/* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
 *
 * Copyright (C) 2015 Atmel
 *
 * Author: Songjun Wu <songjun.wu@atmel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 or later
 * as published by the Free Software Foundation.
 */

#include <linux/of.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#include "atmel-classd.h"


struct atmel_classd_pdata {
	
bool non_overlap_enable;
	
int non_overlap_time;
	
int pwm_type;
	
const char *card_name;
};


struct atmel_classd {
	
dma_addr_t phy_base;
	
struct regmap *regmap;
	
struct clk *pclk;
	
struct clk *gclk;
	
struct clk *aclk;
	
int irq;
	
const struct atmel_classd_pdata *pdata;
};

#ifdef CONFIG_OF

static const struct of_device_id atmel_classd_of_match[] = {
	{
		.compatible = "atmel,sama5d2-classd",
        }, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, atmel_classd_of_match);



static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct atmel_classd_pdata *pdata;
	const char *pwm_type;
	int ret;

	if (!np) {
		dev_err(dev, "device node not found\n");
		return ERR_PTR(-EINVAL);
	}

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
	if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
		pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
	else
		pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;

	ret = of_property_read_u32(np,
			"atmel,non-overlap-time", &pdata->non_overlap_time);
	if (ret)
		pdata->non_overlap_enable = false;
	else
		pdata->non_overlap_enable = true;

	ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
	if (ret)
		pdata->card_name = "CLASSD";

	return pdata;
}
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#else

static inline struct atmel_classd_pdata *

atmel_classd_dt_init(struct device *dev)
{
	return ERR_PTR(-EINVAL);
}
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#endif


#define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
                        | SNDRV_PCM_RATE_16000  | SNDRV_PCM_RATE_22050 \
                        | SNDRV_PCM_RATE_32000  | SNDRV_PCM_RATE_44100 \
                        | SNDRV_PCM_RATE_48000  | SNDRV_PCM_RATE_88200 \
                        | SNDRV_PCM_RATE_96000)


static const struct snd_pcm_hardware atmel_classd_hw = {
	.info			= SNDRV_PCM_INFO_MMAP
				| SNDRV_PCM_INFO_MMAP_VALID
				| SNDRV_PCM_INFO_INTERLEAVED
				| SNDRV_PCM_INFO_RESUME
				| SNDRV_PCM_INFO_PAUSE,
	.formats		= (SNDRV_PCM_FMTBIT_S16_LE),
	.rates			= ATMEL_CLASSD_RATES,
	.rate_min		= 8000,
	.rate_max		= 96000,
	.channels_min		= 1,
	.channels_max		= 2,
	.buffer_bytes_max	= 64 * 1024,
	.period_bytes_min	= 256,
	.period_bytes_max	= 32 * 1024,
	.periods_min		= 2,
	.periods_max		= 256,
};


#define ATMEL_CLASSD_PREALLOC_BUF_SIZE  (64 * 1024)

/* cpu dai component */


static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	regmap_write(dd->regmap, CLASSD_THR, 0x0);

	return clk_prepare_enable(dd->pclk);
}

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static void atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	clk_disable_unprepare(dd->pclk);
}

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static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
	.startup	= atmel_classd_cpu_dai_startup,
	.shutdown	= atmel_classd_cpu_dai_shutdown,
};


static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
	.playback = {
		.channels_min	= 1,
		.channels_max	= 2,
		.rates		= ATMEL_CLASSD_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &atmel_classd_cpu_dai_ops,
};


static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
	.name = "atmel-classd",
};

/* platform */

static int

atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	if (params_physical_width(params) != 16) {
		dev_err(rtd->platform->dev,
			"only supports 16-bit audio data\n");
		return -EINVAL;
	}

	if (params_channels(params) == 1)
		slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	else
		slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;

	slave_config->direction		= DMA_MEM_TO_DEV;
	slave_config->dst_addr		= dd->phy_base + CLASSD_THR;
	slave_config->dst_maxburst	= 1;
	slave_config->src_maxburst	= 1;
	slave_config->device_fc		= false;

	return 0;
}

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static const struct snd_dmaengine_pcm_config

atmel_classd_dmaengine_pcm_config = {
	.prepare_slave_config	= atmel_classd_platform_configure_dma,
	.pcm_hardware		= &atmel_classd_hw,
	.prealloc_buffer_size	= ATMEL_CLASSD_PREALLOC_BUF_SIZE,
};

/* codec */

static const char * const mono_mode_text[] = {
	"mix", "sat", "left", "right"
};

static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
			CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
			mono_mode_text);


static const char * const eqcfg_text[] = {
	"Treble-12dB", "Treble-6dB",
	"Medium-8dB", "Medium-3dB",
	"Bass-12dB", "Bass-6dB",
	"0 dB",
	"Bass+6dB", "Bass+12dB",
	"Medium+3dB", "Medium+8dB",
	"Treble+6dB", "Treble+12dB",
};


static const unsigned int eqcfg_value[] = {
	CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
	CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
	CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
	CLASSD_INTPMR_EQCFG_FLAT,
	CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
	CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
	CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
};

static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
		CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
		eqcfg_text, eqcfg_value);

static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);


static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
		CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
		78, 1, classd_digital_tlv),

SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
		CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),

SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),

SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),

SOC_ENUM("Mono Mode", classd_mono_mode_enum),

SOC_ENUM("EQ", classd_eqcfg_enum),
};


static const char * const pwm_type[] = {
	"Single ended", "Differential"
};



static int atmel_classd_codec_probe(struct snd_soc_codec *codec)
{
	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
	const struct atmel_classd_pdata *pdata = dd->pdata;
	u32 mask, val;

	mask = CLASSD_MR_PWMTYP_MASK;
	val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;

	mask |= CLASSD_MR_NON_OVERLAP_MASK;
	if (pdata->non_overlap_enable) {
		val |= (CLASSD_MR_NON_OVERLAP_EN
			<< CLASSD_MR_NON_OVERLAP_SHIFT);

		mask |= CLASSD_MR_NOVR_VAL_MASK;
		switch (pdata->non_overlap_time) {
		case 5:
			val |= (CLASSD_MR_NOVR_VAL_5NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 10:
			val |= (CLASSD_MR_NOVR_VAL_10NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 15:
			val |= (CLASSD_MR_NOVR_VAL_15NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 20:
			val |= (CLASSD_MR_NOVR_VAL_20NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		default:
			val |= (CLASSD_MR_NOVR_VAL_10NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			dev_warn(codec->dev,
				"non-overlapping value %d is invalid, the default value 10 is specified\n",
				pdata->non_overlap_time);
			break;
		}
	}

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	dev_info(codec->dev,
		"PWM modulation type is %s, non-overlapping is %s\n",
		pwm_type[pdata->pwm_type],
		pdata->non_overlap_enable?"enabled":"disabled");

	return 0;
}

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static struct regmap *atmel_classd_codec_get_remap(struct device *dev)
{
	return dev_get_regmap(dev, NULL);
}

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static struct snd_soc_codec_driver soc_codec_dev_classd = {
	.probe		= atmel_classd_codec_probe,
	.controls	= atmel_classd_snd_controls,
	.num_controls	= ARRAY_SIZE(atmel_classd_snd_controls),
	.get_regmap	= atmel_classd_codec_get_remap,
};

/* codec dai component */


static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
				struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	int ret;

	ret = clk_prepare_enable(dd->aclk);
	if (ret)
		return ret;

	return clk_prepare_enable(dd->gclk);
}

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static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
	int mute)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u32 mask, val;

	mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;

	if (mute)
		val = mask;
	else
		val = 0;

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	return 0;
}

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#define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)

#define CLASSD_ACLK_RATE_12M288_MPY_8  (12228 * 1000 * 8)

static struct {
	
int rate;
	
int sample_rate;
	
int dsp_clk;
	
unsigned long aclk_rate;
} 
const sample_rates[] = {
	{ 8000,  CLASSD_INTPMR_FRAME_8K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 16000, CLASSD_INTPMR_FRAME_16K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 32000, CLASSD_INTPMR_FRAME_32K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 48000, CLASSD_INTPMR_FRAME_48K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 96000, CLASSD_INTPMR_FRAME_96K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 22050, CLASSD_INTPMR_FRAME_22K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	{ 44100, CLASSD_INTPMR_FRAME_44K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	{ 88200, CLASSD_INTPMR_FRAME_88K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
};


static int

atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_codec *codec = codec_dai->codec;
	int fs;
	int i, best, best_val, cur_val, ret;
	u32 mask, val;

	fs = params_rate(params);

	best = 0;
	best_val = abs(fs - sample_rates[0].rate);
	for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
		/* Closest match */
		cur_val = abs(fs - sample_rates[i].rate);
		if (cur_val < best_val) {
			best = i;
			best_val = cur_val;
		}
	}

	dev_dbg(codec->dev,
		"Selected SAMPLE_RATE of %dHz, ACLK_RATE of %ldHz\n",
		sample_rates[best].rate, sample_rates[best].aclk_rate);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->aclk);

	ret = clk_set_rate(dd->aclk, sample_rates[best].aclk_rate);
	if (ret)
		return ret;

	mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
	val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
	| (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);

	snd_soc_update_bits(codec, CLASSD_INTPMR, mask, val);

	ret = clk_prepare_enable(dd->aclk);
	if (ret)
		return ret;

	return clk_prepare_enable(dd->gclk);
}

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static void

atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->aclk);
}

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static int atmel_classd_codec_dai_prepare(struct snd_pcm_substream *substream,
					struct snd_soc_dai *codec_dai)
{
	struct snd_soc_codec *codec = codec_dai->codec;

	snd_soc_update_bits(codec, CLASSD_MR,
				CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
				(CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
				|(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));

	return 0;
}

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static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
					int cmd, struct snd_soc_dai *codec_dai)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u32 mask, val;

	mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		val = mask;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
			| (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
		break;
	default:
		return -EINVAL;
	}

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	return 0;
}

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static const struct snd_soc_dai_ops atmel_classd_codec_dai_ops = {
	.digital_mute	= atmel_classd_codec_dai_digital_mute,
	.startup	= atmel_classd_codec_dai_startup,
	.shutdown	= atmel_classd_codec_dai_shutdown,
	.hw_params	= atmel_classd_codec_dai_hw_params,
	.prepare	= atmel_classd_codec_dai_prepare,
	.trigger	= atmel_classd_codec_dai_trigger,
};


#define ATMEL_CLASSD_CODEC_DAI_NAME  "atmel-classd-hifi"


static struct snd_soc_dai_driver atmel_classd_codec_dai = {
	.name = ATMEL_CLASSD_CODEC_DAI_NAME,
	.playback = {
		.stream_name	= "Playback",
		.channels_min	= 1,
		.channels_max	= 2,
		.rates		= ATMEL_CLASSD_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
        },
	.ops = &atmel_classd_codec_dai_ops,
};

/* ASoC sound card */


static int atmel_classd_asoc_card_init(struct device *dev,
					struct snd_soc_card *card)
{
	struct snd_soc_dai_link *dai_link;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);

	dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
	if (!dai_link)
		return -ENOMEM;

	dai_link->name			= "CLASSD";
	dai_link->stream_name		= "CLASSD PCM";
	dai_link->codec_dai_name	= ATMEL_CLASSD_CODEC_DAI_NAME;
	dai_link->cpu_dai_name		= dev_name(dev);
	dai_link->codec_name		= dev_name(dev);
	dai_link->platform_name		= dev_name(dev);

	card->dai_link	= dai_link;
	card->num_links	= 1;
	card->name	= dd->pdata->card_name;
	card->dev	= dev;

	return 0;
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;

/* regmap configuration */

static const struct reg_default atmel_classd_reg_defaults[] = {
	{ CLASSD_INTPMR,   0x00301212 },
};


#define ATMEL_CLASSD_REG_MAX    0xE4

static const struct regmap_config atmel_classd_regmap_config = {
	.reg_bits	= 32,
	.reg_stride	= 4,
	.val_bits	= 32,
	.max_register	= ATMEL_CLASSD_REG_MAX,

	.cache_type		= REGCACHE_FLAT,
	.reg_defaults		= atmel_classd_reg_defaults,
	.num_reg_defaults	= ARRAY_SIZE(atmel_classd_reg_defaults),
};



static int atmel_classd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct atmel_classd *dd;
	struct resource *res;
	void __iomem *io_base;
	const struct atmel_classd_pdata *pdata;
	struct snd_soc_card *card;
	int ret;

	pdata = dev_get_platdata(dev);
	if (!pdata) {
		pdata = atmel_classd_dt_init(dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	}

	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
	if (!dd)
		return -ENOMEM;

	dd->pdata = pdata;

	dd->irq = platform_get_irq(pdev, 0);
	if (dd->irq < 0) {
		ret = dd->irq;
		dev_err(dev, "failed to could not get irq: %d\n", ret);
		return ret;
	}

	dd->pclk = devm_clk_get(dev, "pclk");
	if (IS_ERR(dd->pclk)) {
		ret = PTR_ERR(dd->pclk);
		dev_err(dev, "failed to get peripheral clock: %d\n", ret);
		return ret;
	}

	dd->gclk = devm_clk_get(dev, "gclk");
	if (IS_ERR(dd->gclk)) {
		ret = PTR_ERR(dd->gclk);
		dev_err(dev, "failed to get GCK clock: %d\n", ret);
		return ret;
	}

	dd->aclk = devm_clk_get(dev, "aclk");
	if (IS_ERR(dd->aclk)) {
		ret = PTR_ERR(dd->aclk);
		dev_err(dev, "failed to get audio clock: %d\n", ret);
		return ret;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(dev, "no memory resource\n");
		return -ENXIO;
	}

	io_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(io_base)) {
		ret =  PTR_ERR(io_base);
		dev_err(dev, "failed to remap register memory: %d\n", ret);
		return ret;
	}

	dd->phy_base = res->start;

	dd->regmap = devm_regmap_init_mmio(dev, io_base,
					&atmel_classd_regmap_config);
	if (IS_ERR(dd->regmap)) {
		ret = PTR_ERR(dd->regmap);
		dev_err(dev, "failed to init register map: %d\n", ret);
		return ret;
	}

	ret = devm_snd_soc_register_component(dev,
					&atmel_classd_cpu_dai_component,
					&atmel_classd_cpu_dai, 1);
	if (ret) {
		dev_err(dev, "could not register CPU DAI: %d\n", ret);
		return ret;
	}

	ret = devm_snd_dmaengine_pcm_register(dev,
					&atmel_classd_dmaengine_pcm_config,
					0);
	if (ret) {
		dev_err(dev, "could not register platform: %d\n", ret);
		return ret;
	}

	ret = snd_soc_register_codec(dev, &soc_codec_dev_classd,
					&atmel_classd_codec_dai, 1);
	if (ret) {
		dev_err(dev, "could not register codec: %d\n", ret);
		return ret;
	}

	/* register sound card */
	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
	if (!card) {
		ret = -ENOMEM;
		goto unregister_codec;
	}

	snd_soc_card_set_drvdata(card, dd);
	platform_set_drvdata(pdev, card);

	ret = atmel_classd_asoc_card_init(dev, card);
	if (ret) {
		dev_err(dev, "failed to init sound card\n");
		goto unregister_codec;
	}

	ret = devm_snd_soc_register_card(dev, card);
	if (ret) {
		dev_err(dev, "failed to register sound card: %d\n", ret);
		goto unregister_codec;
	}

	return 0;

unregister_codec:
	snd_soc_unregister_codec(dev);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
songjun wu songjun wu 608 100.00% 2 100.00%
Total 608 100.00% 2 100.00%



static int atmel_classd_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

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Person Tokens Prop Commits CommitProp
songjun wu songjun wu 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%


static struct platform_driver atmel_classd_driver = {
	.driver	= {
		.name		= "atmel-classd",
		.of_match_table	= of_match_ptr(atmel_classd_of_match),
		.pm		= &snd_soc_pm_ops,
        },
	.probe	= atmel_classd_probe,
	.remove	= atmel_classd_remove,
};

module_platform_driver(atmel_classd_driver);

MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
songjun wu songjun wu 2904 100.00% 3 100.00%
Total 2904 100.00% 3 100.00%
  Directory: sound/soc/atmel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
songjun wu	songjun wu	185	100.00%	1	100.00%
	Total	185	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 sound/soc/atmel/atmel-classd.c

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