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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/soc/samsung/smdk_wm8994pcm.c
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// SPDX-License-Identifier: GPL-2.0+

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//

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// Copyright (c) 2011 Samsung Electronics Co., Ltd

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//		http://www.samsung.com

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#include <linux/module.h>

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#include <sound/soc.h>

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#include <sound/pcm.h>

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#include <sound/pcm_params.h>

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#include "../codecs/wm8994.h"

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#include "pcm.h"

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/*

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 * Board Settings:

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 *  o '1' means 'ON'

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 *  o '0' means 'OFF'

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 *  o 'X' means 'Don't care'

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 *

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 * SMDKC210, SMDKV310: CFG3- 1001, CFG5-1000, CFG7-111111

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 */

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/*

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 * Configure audio route as :-

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 * $ amixer sset 'DAC1' on,on

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 * $ amixer sset 'Right Headphone Mux' 'DAC'

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 * $ amixer sset 'Left Headphone Mux' 'DAC'

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 * $ amixer sset 'DAC1R Mixer AIF1.1' on

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 * $ amixer sset 'DAC1L Mixer AIF1.1' on

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 * $ amixer sset 'IN2L' on

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 * $ amixer sset 'IN2L PGA IN2LN' on

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 * $ amixer sset 'MIXINL IN2L' on

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 * $ amixer sset 'AIF1ADC1L Mixer ADC/DMIC' on

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 * $ amixer sset 'IN2R' on

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 * $ amixer sset 'IN2R PGA IN2RN' on

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 * $ amixer sset 'MIXINR IN2R' on

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 * $ amixer sset 'AIF1ADC1R Mixer ADC/DMIC' on

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 */

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/* SMDK has a 16.9344MHZ crystal attached to WM8994 */

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#define SMDK_WM8994_FREQ 16934400

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static int smdk_wm8994_pcm_hw_params(struct snd_pcm_substream *substream,

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			      struct snd_pcm_hw_params *params)

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{

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	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);

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	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);

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	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);

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	unsigned long mclk_freq;

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	int rfs, ret;

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	switch(params_rate(params)) {

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	case 8000:

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		rfs = 512;

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		break;

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	default:

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		dev_err(cpu_dai->dev, "%s:%d Sampling Rate %u not supported!\n",

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		__func__, __LINE__, params_rate(params));

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		return -EINVAL;

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	}

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	mclk_freq = params_rate(params) * rfs;

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	ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_FLL1,

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					mclk_freq, SND_SOC_CLOCK_IN);

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	if (ret < 0)

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		return ret;

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	ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1, WM8994_FLL_SRC_MCLK1,

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					SMDK_WM8994_FREQ, mclk_freq);

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	if (ret < 0)

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		return ret;

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	/* Set PCM source clock on CPU */

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	ret = snd_soc_dai_set_sysclk(cpu_dai, S3C_PCM_CLKSRC_MUX,

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					mclk_freq, SND_SOC_CLOCK_IN);

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	if (ret < 0)

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		return ret;

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	/* Set SCLK_DIV for making bclk */

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	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);

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	if (ret < 0)

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		return ret;

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	return 0;

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}

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static const struct snd_soc_ops smdk_wm8994_pcm_ops = {

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	.hw_params = smdk_wm8994_pcm_hw_params,

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};

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SND_SOC_DAILINK_DEFS(paif_pcm,

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	DAILINK_COMP_ARRAY(COMP_CPU("samsung-pcm.0")),

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	DAILINK_COMP_ARRAY(COMP_CODEC("wm8994-codec", "wm8994-aif1")),

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	DAILINK_COMP_ARRAY(COMP_PLATFORM("samsung-pcm.0")));

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static struct snd_soc_dai_link smdk_dai[] = {

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	{

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		.name = "WM8994 PAIF PCM",

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		.stream_name = "Primary PCM",

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		.dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF |

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			   SND_SOC_DAIFMT_CBC_CFC,

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		.ops = &smdk_wm8994_pcm_ops,

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		SND_SOC_DAILINK_REG(paif_pcm),

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	},

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};

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static struct snd_soc_card smdk_pcm = {

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	.name = "SMDK-PCM",

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	.owner = THIS_MODULE,

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	.dai_link = smdk_dai,

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	.num_links = 1,

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};

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static int snd_smdk_probe(struct platform_device *pdev)

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{

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	int ret = 0;

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	smdk_pcm.dev = &pdev->dev;

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	ret = devm_snd_soc_register_card(&pdev->dev, &smdk_pcm);

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	if (ret)

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		dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");

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	return ret;

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}

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static struct platform_driver snd_smdk_driver = {

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	.driver = {

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		.name = "samsung-smdk-pcm",

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	},

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	.probe = snd_smdk_probe,

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};

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module_platform_driver(snd_smdk_driver);

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MODULE_AUTHOR("Sangbeom Kim, <[email protected]>");

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MODULE_DESCRIPTION("ALSA SoC SMDK WM8994 for PCM");

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MODULE_LICENSE("GPL");

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