text: // SPDX-License-Identifier: GPL-2.0-or-later
  /* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
   *
   * Copyright (C) 2015 Atmel
   *
   * Author: Songjun Wu <songjun.wu@atmel.com>
   */
  
  #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 device *dev;
  	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;
  }
  #else
  static inline struct atmel_classd_pdata *
  atmel_classd_dt_init(struct device *dev)
  {
  	return ERR_PTR(-EINVAL);
  }
  #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);
  }
  
  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);
  }
  
  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(dd->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;
  }
  
  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_component_probe(struct snd_soc_component *component)
  {
  	struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
  	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(component->dev,
  				"non-overlapping value %d is invalid, the default value 10 is specified\n",
  				pdata->non_overlap_time);
  			break;
  		}
  	}
  
  	snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
  
  	dev_info(component->dev,
  		"PWM modulation type is %s, non-overlapping is %s\n",
  		pwm_type[pdata->pwm_type],
  		pdata->non_overlap_enable?"enabled":"disabled");
  
  	return 0;
  }
  
  static int atmel_classd_component_resume(struct snd_soc_component *component)
  {
  	struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
  	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
  
  	return regcache_sync(dd->regmap);
  }
  
  static struct snd_soc_component_driver soc_component_dev_classd = {
  	.probe			= atmel_classd_component_probe,
  	.resume			= atmel_classd_component_resume,
  	.controls		= atmel_classd_snd_controls,
  	.num_controls		= ARRAY_SIZE(atmel_classd_snd_controls),
  	.idle_bias_on		= 1,
  	.use_pmdown_time	= 1,
  	.endianness		= 1,
  	.non_legacy_dai_naming	= 1,
  };
  
  /* 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);
  
  	return clk_prepare_enable(dd->gclk);
  }
  
  static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
  	int mute)
  {
  	struct snd_soc_component *component = codec_dai->component;
  	u32 mask, val;
  
  	mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;
  
  	if (mute)
  		val = mask;
  	else
  		val = 0;
  
  	snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
  
  	return 0;
  }
  
  #define CLASSD_GCLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
  #define CLASSD_GCLK_RATE_12M288_MPY_8  (12288 * 1000 * 8)
  
  static struct {
  	int rate;
  	int sample_rate;
  	int dsp_clk;
  	unsigned long gclk_rate;
  } const sample_rates[] = {
  	{ 8000,  CLASSD_INTPMR_FRAME_8K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
  	{ 16000, CLASSD_INTPMR_FRAME_16K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
  	{ 32000, CLASSD_INTPMR_FRAME_32K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
  	{ 48000, CLASSD_INTPMR_FRAME_48K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
  	{ 96000, CLASSD_INTPMR_FRAME_96K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
  	{ 22050, CLASSD_INTPMR_FRAME_22K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
  	{ 44100, CLASSD_INTPMR_FRAME_44K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
  	{ 88200, CLASSD_INTPMR_FRAME_88K,
  	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_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_component *component = codec_dai->component;
  	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(component->dev,
  		"Selected SAMPLE_RATE of %dHz, GCLK_RATE of %ldHz\n",
  		sample_rates[best].rate, sample_rates[best].gclk_rate);
  
  	clk_disable_unprepare(dd->gclk);
  
  	ret = clk_set_rate(dd->gclk, sample_rates[best].gclk_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_component_update_bits(component, CLASSD_INTPMR, mask, val);
  
  	return clk_prepare_enable(dd->gclk);
  }
  
  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);
  }
  
  static int atmel_classd_codec_dai_prepare(struct snd_pcm_substream *substream,
  					struct snd_soc_dai *codec_dai)
  {
  	struct snd_soc_component *component = codec_dai->component;
  
  	snd_soc_component_update_bits(component, 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;
  }
  
  static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
  					int cmd, struct snd_soc_dai *codec_dai)
  {
  	struct snd_soc_component *component = codec_dai->component;
  	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_component_update_bits(component, CLASSD_MR, mask, val);
  
  	return 0;
  }
  
  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);
  	struct snd_soc_dai_link_component *comp;
  
  	dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
  	if (!dai_link)
  		return -ENOMEM;
  
  	comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL);
  	if (!comp)
  		return -ENOMEM;
  
  	dai_link->cpus		= &comp[0];
  	dai_link->codecs	= &comp[1];
  	dai_link->platforms	= &comp[2];
  
  	dai_link->num_cpus	= 1;
  	dai_link->num_codecs	= 1;
  	dai_link->num_platforms	= 1;
  
  	dai_link->name			= "CLASSD";
  	dai_link->stream_name		= "CLASSD PCM";
  	dai_link->codecs->dai_name	= ATMEL_CLASSD_CODEC_DAI_NAME;
  	dai_link->cpus->dai_name	= dev_name(dev);
  	dai_link->codecs->name		= dev_name(dev);
  	dai_link->platforms->name	= dev_name(dev);
  
  	card->dai_link	= dai_link;
  	card->num_links	= 1;
  	card->name	= dd->pdata->card_name;
  	card->dev	= dev;
  
  	return 0;
  };
  
  /* 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;
  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	io_base = devm_ioremap_resource(dev, res);
  	if (IS_ERR(io_base))
  		return PTR_ERR(io_base);
  
  	dd->phy_base = res->start;
  	dd->dev = dev;
  
  	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 = devm_snd_soc_register_component(dev, &soc_component_dev_classd,
  					&atmel_classd_codec_dai, 1);
  	if (ret) {
  		dev_err(dev, "could not register component: %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);
  
  	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:
  	return ret;
  }
  
  static int atmel_classd_remove(struct platform_device *pdev)
  {
  	return 0;
  }
  
  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");
  