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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; }

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

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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");

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Directory: sound/soc/atmel
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