sound/soc/intel/boards/cht_bsw_max98090_ti.c - arm/linux - Git at Google

 /*
  *  cht-bsw-max98090.c - ASoc Machine driver for Intel Cherryview-based
  *  platforms Cherrytrail and Braswell, with max98090 & TI codec.
  *
  *  Copyright (C) 2015 Intel Corp
  *  Author: Fang, Yang A <yang.a.fang@intel.com>
  *  This file is modified from cht_bsw_rt5645.c
  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  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; version 2 of the License.
  *
  *  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.
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/jack.h>
 #include "../../codecs/max98090.h"
 #include "../atom/sst-atom-controls.h"
 #include "../../codecs/ts3a227e.h"

 #define CHT_PLAT_CLK_3_HZ	19200000
 #define CHT_CODEC_DAI	"HiFi"

 struct cht_mc_private {
 	struct snd_soc_jack jack;
 	bool ts3a227e_present;
 };

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

 static const struct snd_soc_dapm_route cht_audio_map[] = {
 	{"IN34", NULL, "Headset Mic"},
 	{"Headset Mic", NULL, "MICBIAS"},
 	{"DMICL", NULL, "Int Mic"},
 	{"Headphone", NULL, "HPL"},
 	{"Headphone", NULL, "HPR"},
 	{"Ext Spk", NULL, "SPKL"},
 	{"Ext Spk", NULL, "SPKR"},
 	{"HiFi Playback", NULL, "ssp2 Tx"},
 	{"ssp2 Tx", NULL, "codec_out0"},
 	{"ssp2 Tx", NULL, "codec_out1"},
 	{"codec_in0", NULL, "ssp2 Rx" },
 	{"codec_in1", NULL, "ssp2 Rx" },
 	{"ssp2 Rx", NULL, "HiFi Capture"},
 };

 static const struct snd_kcontrol_new cht_mc_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Headphone"),
 	SOC_DAPM_PIN_SWITCH("Headset Mic"),
 	SOC_DAPM_PIN_SWITCH("Int Mic"),
 	SOC_DAPM_PIN_SWITCH("Ext Spk"),
 };

 static int cht_aif1_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->codec_dai;
 	int ret;

 	ret = snd_soc_dai_set_sysclk(codec_dai, M98090_REG_SYSTEM_CLOCK,
 				     CHT_PLAT_CLK_3_HZ, SND_SOC_CLOCK_IN);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set codec sysclk: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int cht_ti_jack_event(struct notifier_block *nb,
 		unsigned long event, void *data)
 {
 	struct snd_soc_jack *jack = (struct snd_soc_jack *)data;
 	struct snd_soc_dapm_context *dapm = &jack->card->dapm;

 	if (event & SND_JACK_MICROPHONE) {
 		snd_soc_dapm_force_enable_pin(dapm, "SHDN");
 		snd_soc_dapm_force_enable_pin(dapm, "MICBIAS");
 		snd_soc_dapm_sync(dapm);
 	} else {
 		snd_soc_dapm_disable_pin(dapm, "MICBIAS");
 		snd_soc_dapm_disable_pin(dapm, "SHDN");
 		snd_soc_dapm_sync(dapm);
 	}

 	return 0;
 }

 static struct notifier_block cht_jack_nb = {
 	.notifier_call = cht_ti_jack_event,
 };

 static int cht_codec_init(struct snd_soc_pcm_runtime *runtime)
 {
 	int ret;
 	int jack_type;
 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(runtime->card);
 	struct snd_soc_jack *jack = &ctx->jack;

 	/**
 	* TI supports 4 butons headset detection
 	* KEY_MEDIA
 	* KEY_VOICECOMMAND
 	* KEY_VOLUMEUP
 	* KEY_VOLUMEDOWN
 	*/
 	if (ctx->ts3a227e_present)
 		jack_type = SND_JACK_HEADPHONE | SND_JACK_MICROPHONE |
 					SND_JACK_BTN_0 | SND_JACK_BTN_1 |
 					SND_JACK_BTN_2 | SND_JACK_BTN_3;
 	else
 		jack_type = SND_JACK_HEADPHONE | SND_JACK_MICROPHONE;

 	ret = snd_soc_card_jack_new(runtime->card, "Headset Jack",
 					jack_type, jack, NULL, 0);

 	if (ret) {
 		dev_err(runtime->dev, "Headset Jack creation failed %d\n", ret);
 		return ret;
 	}

 	if (ctx->ts3a227e_present)
 		snd_soc_jack_notifier_register(jack, &cht_jack_nb);

 	return ret;
 }

 static int cht_codec_fixup(struct snd_soc_pcm_runtime *rtd,
 			    struct snd_pcm_hw_params *params)
 {
 	struct snd_interval *rate = hw_param_interval(params,
 			SNDRV_PCM_HW_PARAM_RATE);
 	struct snd_interval *channels = hw_param_interval(params,
 						SNDRV_PCM_HW_PARAM_CHANNELS);
 	int ret = 0;
 	unsigned int fmt = 0;

 	ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 16);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set cpu_dai slot fmt: %d\n", ret);
 		return ret;
 	}

 	fmt = SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF
 				| SND_SOC_DAIFMT_CBS_CFS;

 	ret = snd_soc_dai_set_fmt(rtd->cpu_dai, fmt);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set cpu_dai set fmt: %d\n", ret);
 		return ret;
 	}

 	/* The DSP will covert the FE rate to 48k, stereo, 24bits */
 	rate->min = rate->max = 48000;
 	channels->min = channels->max = 2;

 	/* set SSP2 to 24-bit */
 	params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
 	return 0;
 }

 static int cht_aif1_startup(struct snd_pcm_substream *substream)
 {
 	return snd_pcm_hw_constraint_single(substream->runtime,
 			SNDRV_PCM_HW_PARAM_RATE, 48000);
 }

 static int cht_max98090_headset_init(struct snd_soc_component *component)
 {
 	struct snd_soc_card *card = component->card;
 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(card);

 	return ts3a227e_enable_jack_detect(component, &ctx->jack);
 }

 static const struct snd_soc_ops cht_aif1_ops = {
 	.startup = cht_aif1_startup,
 };

 static const struct snd_soc_ops cht_be_ssp2_ops = {
 	.hw_params = cht_aif1_hw_params,
 };

 static struct snd_soc_aux_dev cht_max98090_headset_dev = {
 	.name = "Headset Chip",
 	.init = cht_max98090_headset_init,
 	.codec_name = "i2c-104C227E:00",
 };

 static struct snd_soc_dai_link cht_dailink[] = {
 	[MERR_DPCM_AUDIO] = {
 		.name = "Audio Port",
 		.stream_name = "Audio",
 		.cpu_dai_name = "media-cpu-dai",
 		.codec_dai_name = "snd-soc-dummy-dai",
 		.codec_name = "snd-soc-dummy",
 		.platform_name = "sst-mfld-platform",
 		.nonatomic = true,
 		.dynamic = 1,
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
 		.ops = &cht_aif1_ops,
 	},
 	[MERR_DPCM_DEEP_BUFFER] = {
 		.name = "Deep-Buffer Audio Port",
 		.stream_name = "Deep-Buffer Audio",
 		.cpu_dai_name = "deepbuffer-cpu-dai",
 		.codec_dai_name = "snd-soc-dummy-dai",
 		.codec_name = "snd-soc-dummy",
 		.platform_name = "sst-mfld-platform",
 		.nonatomic = true,
 		.dynamic = 1,
 		.dpcm_playback = 1,
 		.ops = &cht_aif1_ops,
 	},
 	[MERR_DPCM_COMPR] = {
 		.name = "Compressed Port",
 		.stream_name = "Compress",
 		.cpu_dai_name = "compress-cpu-dai",
 		.codec_dai_name = "snd-soc-dummy-dai",
 		.codec_name = "snd-soc-dummy",
 		.platform_name = "sst-mfld-platform",
 	},
 	/* back ends */
 	{
 		.name = "SSP2-Codec",
 		.id = 1,
 		.cpu_dai_name = "ssp2-port",
 		.platform_name = "sst-mfld-platform",
 		.no_pcm = 1,
 		.codec_dai_name = "HiFi",
 		.codec_name = "i2c-193C9890:00",
 		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 					| SND_SOC_DAIFMT_CBS_CFS,
 		.init = cht_codec_init,
 		.be_hw_params_fixup = cht_codec_fixup,
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
 		.ops = &cht_be_ssp2_ops,
 	},
 };

 /* SoC card */
 static struct snd_soc_card snd_soc_card_cht = {
 	.name = "chtmax98090",
 	.owner = THIS_MODULE,
 	.dai_link = cht_dailink,
 	.num_links = ARRAY_SIZE(cht_dailink),
 	.aux_dev = &cht_max98090_headset_dev,
 	.num_aux_devs = 1,
 	.dapm_widgets = cht_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(cht_dapm_widgets),
 	.dapm_routes = cht_audio_map,
 	.num_dapm_routes = ARRAY_SIZE(cht_audio_map),
 	.controls = cht_mc_controls,
 	.num_controls = ARRAY_SIZE(cht_mc_controls),
 };

 static int snd_cht_mc_probe(struct platform_device *pdev)
 {
 	int ret_val = 0;
 	struct cht_mc_private *drv;

 	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_ATOMIC);
 	if (!drv)
 		return -ENOMEM;

 	drv->ts3a227e_present = acpi_dev_found("104C227E");
 	if (!drv->ts3a227e_present) {
 		/* no need probe TI jack detection chip */
 		snd_soc_card_cht.aux_dev = NULL;
 		snd_soc_card_cht.num_aux_devs = 0;
 	}

 	/* register the soc card */
 	snd_soc_card_cht.dev = &pdev->dev;
 	snd_soc_card_set_drvdata(&snd_soc_card_cht, drv);
 	ret_val = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_cht);
 	if (ret_val) {
 		dev_err(&pdev->dev,
 			"snd_soc_register_card failed %d\n", ret_val);
 		return ret_val;
 	}
 	platform_set_drvdata(pdev, &snd_soc_card_cht);
 	return ret_val;
 }

 static struct platform_driver snd_cht_mc_driver = {
 	.driver = {
 		.name = "cht-bsw-max98090",
 	},
 	.probe = snd_cht_mc_probe,
 };

 module_platform_driver(snd_cht_mc_driver)

 MODULE_DESCRIPTION("ASoC Intel(R) Braswell Machine driver");
 MODULE_AUTHOR("Fang, Yang A <yang.a.fang@intel.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:cht-bsw-max98090");
	/*
	* cht-bsw-max98090.c - ASoc Machine driver for Intel Cherryview-based
	* platforms Cherrytrail and Braswell, with max98090 & TI codec.
	*
	* Copyright (C) 2015 Intel Corp
	* Author: Fang, Yang A <yang.a.fang@intel.com>
	* This file is modified from cht_bsw_rt5645.c
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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; version 2 of the License.
	*
	* 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.
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/acpi.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/jack.h>
	#include "../../codecs/max98090.h"
	#include "../atom/sst-atom-controls.h"
	#include "../../codecs/ts3a227e.h"

	#define CHT_PLAT_CLK_3_HZ 19200000
	#define CHT_CODEC_DAI "HiFi"

	struct cht_mc_private {
	struct snd_soc_jack jack;
	bool ts3a227e_present;
	};

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

	static const struct snd_soc_dapm_route cht_audio_map[] = {
	{"IN34", NULL, "Headset Mic"},
	{"Headset Mic", NULL, "MICBIAS"},
	{"DMICL", NULL, "Int Mic"},
	{"Headphone", NULL, "HPL"},
	{"Headphone", NULL, "HPR"},
	{"Ext Spk", NULL, "SPKL"},
	{"Ext Spk", NULL, "SPKR"},
	{"HiFi Playback", NULL, "ssp2 Tx"},
	{"ssp2 Tx", NULL, "codec_out0"},
	{"ssp2 Tx", NULL, "codec_out1"},
	{"codec_in0", NULL, "ssp2 Rx" },
	{"codec_in1", NULL, "ssp2 Rx" },
	{"ssp2 Rx", NULL, "HiFi Capture"},
	};

	static const struct snd_kcontrol_new cht_mc_controls[] = {
	SOC_DAPM_PIN_SWITCH("Headphone"),
	SOC_DAPM_PIN_SWITCH("Headset Mic"),
	SOC_DAPM_PIN_SWITCH("Int Mic"),
	SOC_DAPM_PIN_SWITCH("Ext Spk"),
	};

	static int cht_aif1_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->codec_dai;
	int ret;

	ret = snd_soc_dai_set_sysclk(codec_dai, M98090_REG_SYSTEM_CLOCK,
	CHT_PLAT_CLK_3_HZ, SND_SOC_CLOCK_IN);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set codec sysclk: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int cht_ti_jack_event(struct notifier_block *nb,
	unsigned long event, void *data)
	{
	struct snd_soc_jack jack = (struct snd_soc_jack )data;
	struct snd_soc_dapm_context *dapm = &jack->card->dapm;

	if (event & SND_JACK_MICROPHONE) {
	snd_soc_dapm_force_enable_pin(dapm, "SHDN");
	snd_soc_dapm_force_enable_pin(dapm, "MICBIAS");
	snd_soc_dapm_sync(dapm);
	} else {
	snd_soc_dapm_disable_pin(dapm, "MICBIAS");
	snd_soc_dapm_disable_pin(dapm, "SHDN");
	snd_soc_dapm_sync(dapm);
	}

	return 0;
	}

	static struct notifier_block cht_jack_nb = {
	.notifier_call = cht_ti_jack_event,
	};

	static int cht_codec_init(struct snd_soc_pcm_runtime *runtime)
	{
	int ret;
	int jack_type;
	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(runtime->card);
	struct snd_soc_jack *jack = &ctx->jack;

	/**
	* TI supports 4 butons headset detection
	* KEY_MEDIA
	* KEY_VOICECOMMAND
	* KEY_VOLUMEUP
	* KEY_VOLUMEDOWN
	*/
	if (ctx->ts3a227e_present)
	jack_type = SND_JACK_HEADPHONE \| SND_JACK_MICROPHONE \|
	SND_JACK_BTN_0 \| SND_JACK_BTN_1 \|
	SND_JACK_BTN_2 \| SND_JACK_BTN_3;
	else
	jack_type = SND_JACK_HEADPHONE \| SND_JACK_MICROPHONE;

	ret = snd_soc_card_jack_new(runtime->card, "Headset Jack",
	jack_type, jack, NULL, 0);

	if (ret) {
	dev_err(runtime->dev, "Headset Jack creation failed %d\n", ret);
	return ret;
	}

	if (ctx->ts3a227e_present)
	snd_soc_jack_notifier_register(jack, &cht_jack_nb);

	return ret;
	}

	static int cht_codec_fixup(struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_hw_params *params)
	{
	struct snd_interval *rate = hw_param_interval(params,
	SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *channels = hw_param_interval(params,
	SNDRV_PCM_HW_PARAM_CHANNELS);
	int ret = 0;
	unsigned int fmt = 0;

	ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 16);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set cpu_dai slot fmt: %d\n", ret);
	return ret;
	}

	fmt = SND_SOC_DAIFMT_LEFT_J \| SND_SOC_DAIFMT_NB_NF
	\| SND_SOC_DAIFMT_CBS_CFS;

	ret = snd_soc_dai_set_fmt(rtd->cpu_dai, fmt);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set cpu_dai set fmt: %d\n", ret);
	return ret;
	}

	/* The DSP will covert the FE rate to 48k, stereo, 24bits */
	rate->min = rate->max = 48000;
	channels->min = channels->max = 2;

	/* set SSP2 to 24-bit */
	params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
	return 0;
	}

	static int cht_aif1_startup(struct snd_pcm_substream *substream)
	{
	return snd_pcm_hw_constraint_single(substream->runtime,
	SNDRV_PCM_HW_PARAM_RATE, 48000);
	}

	static int cht_max98090_headset_init(struct snd_soc_component *component)
	{
	struct snd_soc_card *card = component->card;
	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(card);

	return ts3a227e_enable_jack_detect(component, &ctx->jack);
	}

	static const struct snd_soc_ops cht_aif1_ops = {
	.startup = cht_aif1_startup,
	};

	static const struct snd_soc_ops cht_be_ssp2_ops = {
	.hw_params = cht_aif1_hw_params,
	};

	static struct snd_soc_aux_dev cht_max98090_headset_dev = {
	.name = "Headset Chip",
	.init = cht_max98090_headset_init,
	.codec_name = "i2c-104C227E:00",
	};

	static struct snd_soc_dai_link cht_dailink[] = {
	[MERR_DPCM_AUDIO] = {
	.name = "Audio Port",
	.stream_name = "Audio",
	.cpu_dai_name = "media-cpu-dai",
	.codec_dai_name = "snd-soc-dummy-dai",
	.codec_name = "snd-soc-dummy",
	.platform_name = "sst-mfld-platform",
	.nonatomic = true,
	.dynamic = 1,
	.dpcm_playback = 1,
	.dpcm_capture = 1,
	.ops = &cht_aif1_ops,
	},
	[MERR_DPCM_DEEP_BUFFER] = {
	.name = "Deep-Buffer Audio Port",
	.stream_name = "Deep-Buffer Audio",
	.cpu_dai_name = "deepbuffer-cpu-dai",
	.codec_dai_name = "snd-soc-dummy-dai",
	.codec_name = "snd-soc-dummy",
	.platform_name = "sst-mfld-platform",
	.nonatomic = true,
	.dynamic = 1,
	.dpcm_playback = 1,
	.ops = &cht_aif1_ops,
	},
	[MERR_DPCM_COMPR] = {
	.name = "Compressed Port",
	.stream_name = "Compress",
	.cpu_dai_name = "compress-cpu-dai",
	.codec_dai_name = "snd-soc-dummy-dai",
	.codec_name = "snd-soc-dummy",
	.platform_name = "sst-mfld-platform",
	},
	/* back ends */
	{
	.name = "SSP2-Codec",
	.id = 1,
	.cpu_dai_name = "ssp2-port",
	.platform_name = "sst-mfld-platform",
	.no_pcm = 1,
	.codec_dai_name = "HiFi",
	.codec_name = "i2c-193C9890:00",
	.dai_fmt = SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_NF
	\| SND_SOC_DAIFMT_CBS_CFS,
	.init = cht_codec_init,
	.be_hw_params_fixup = cht_codec_fixup,
	.dpcm_playback = 1,
	.dpcm_capture = 1,
	.ops = &cht_be_ssp2_ops,
	},
	};

	/* SoC card */
	static struct snd_soc_card snd_soc_card_cht = {
	.name = "chtmax98090",
	.owner = THIS_MODULE,
	.dai_link = cht_dailink,
	.num_links = ARRAY_SIZE(cht_dailink),
	.aux_dev = &cht_max98090_headset_dev,
	.num_aux_devs = 1,
	.dapm_widgets = cht_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(cht_dapm_widgets),
	.dapm_routes = cht_audio_map,
	.num_dapm_routes = ARRAY_SIZE(cht_audio_map),
	.controls = cht_mc_controls,
	.num_controls = ARRAY_SIZE(cht_mc_controls),
	};

	static int snd_cht_mc_probe(struct platform_device *pdev)
	{
	int ret_val = 0;
	struct cht_mc_private *drv;

	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_ATOMIC);
	if (!drv)
	return -ENOMEM;

	drv->ts3a227e_present = acpi_dev_found("104C227E");
	if (!drv->ts3a227e_present) {
	/* no need probe TI jack detection chip */
	snd_soc_card_cht.aux_dev = NULL;
	snd_soc_card_cht.num_aux_devs = 0;
	}

	/* register the soc card */
	snd_soc_card_cht.dev = &pdev->dev;
	snd_soc_card_set_drvdata(&snd_soc_card_cht, drv);
	ret_val = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_cht);
	if (ret_val) {
	dev_err(&pdev->dev,
	"snd_soc_register_card failed %d\n", ret_val);
	return ret_val;
	}
	platform_set_drvdata(pdev, &snd_soc_card_cht);
	return ret_val;
	}

	static struct platform_driver snd_cht_mc_driver = {
	.driver = {
	.name = "cht-bsw-max98090",
	},
	.probe = snd_cht_mc_probe,
	};

	module_platform_driver(snd_cht_mc_driver)

	MODULE_DESCRIPTION("ASoC Intel(R) Braswell Machine driver");
	MODULE_AUTHOR("Fang, Yang A <yang.a.fang@intel.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:cht-bsw-max98090");