sound/soc/intel/boards/bytcr_rt5640.c - kernel/msm-4.19 - Gitiles

 /*
  *  byt_cr_dpcm_rt5640.c - ASoc Machine driver for Intel Byt CR platform
  *
  *  Copyright (C) 2014 Intel Corp
  *  Author: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  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/init.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
 #include <linux/device.h>
 #include <linux/dmi.h>
 #include <linux/slab.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/jack.h>
 #include "../../codecs/rt5640.h"
 #include "../atom/sst-atom-controls.h"
 #include "../common/sst-acpi.h"

 static const struct snd_soc_dapm_widget byt_rt5640_widgets[] = {
 	SND_SOC_DAPM_HP("Headphone", NULL),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
 	SND_SOC_DAPM_MIC("Internal Mic", NULL),
 	SND_SOC_DAPM_SPK("Speaker", NULL),
 };

 static const struct snd_soc_dapm_route byt_rt5640_audio_map[] = {
 	{"AIF1 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, "AIF1 Capture"},

 	{"Headset Mic", NULL, "MICBIAS1"},
 	{"IN2P", NULL, "Headset Mic"},
 	{"Headphone", NULL, "HPOL"},
 	{"Headphone", NULL, "HPOR"},
 	{"Speaker", NULL, "SPOLP"},
 	{"Speaker", NULL, "SPOLN"},
 	{"Speaker", NULL, "SPORP"},
 	{"Speaker", NULL, "SPORN"},
 };

 static const struct snd_soc_dapm_route byt_rt5640_intmic_dmic1_map[] = {
 	{"DMIC1", NULL, "Internal Mic"},
 };

 static const struct snd_soc_dapm_route byt_rt5640_intmic_dmic2_map[] = {
 	{"DMIC2", NULL, "Internal Mic"},
 };

 static const struct snd_soc_dapm_route byt_rt5640_intmic_in1_map[] = {
 	{"Internal Mic", NULL, "MICBIAS1"},
 	{"IN1P", NULL, "Internal Mic"},
 };

 enum {
 	BYT_RT5640_DMIC1_MAP,
 	BYT_RT5640_DMIC2_MAP,
 	BYT_RT5640_IN1_MAP,
 };

 #define BYT_RT5640_MAP(quirk)	((quirk) & 0xff)
 #define BYT_RT5640_DMIC_EN	BIT(16)

 static unsigned long byt_rt5640_quirk = BYT_RT5640_DMIC1_MAP |
 					BYT_RT5640_DMIC_EN;

 static const struct snd_kcontrol_new byt_rt5640_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Headphone"),
 	SOC_DAPM_PIN_SWITCH("Headset Mic"),
 	SOC_DAPM_PIN_SWITCH("Internal Mic"),
 	SOC_DAPM_PIN_SWITCH("Speaker"),
 };

 static int byt_rt5640_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;

 	snd_soc_dai_set_bclk_ratio(codec_dai, 50);

 	ret = snd_soc_dai_set_sysclk(codec_dai, RT5640_SCLK_S_PLL1,
 				     params_rate(params) * 512,
 				     SND_SOC_CLOCK_IN);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set codec clock %d\n", ret);
 		return ret;
 	}

 	ret = snd_soc_dai_set_pll(codec_dai, 0, RT5640_PLL1_S_BCLK1,
 				  params_rate(params) * 50,
 				  params_rate(params) * 512);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set codec pll: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int byt_rt5640_quirk_cb(const struct dmi_system_id *id)
 {
 	byt_rt5640_quirk = (unsigned long)id->driver_data;
 	return 1;
 }

 static const struct dmi_system_id byt_rt5640_quirk_table[] = {
 	{
 		.callback = byt_rt5640_quirk_cb,
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 			DMI_MATCH(DMI_PRODUCT_NAME, "T100TA"),
 		},
 		.driver_data = (unsigned long *)BYT_RT5640_IN1_MAP,
 	},
 	{
 		.callback = byt_rt5640_quirk_cb,
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "DellInc."),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Venue 8 Pro 5830"),
 		},
 		.driver_data = (unsigned long *)(BYT_RT5640_DMIC2_MAP |
 						 BYT_RT5640_DMIC_EN),
 	},
 	{
 		.callback = byt_rt5640_quirk_cb,
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "HP ElitePad 1000 G2"),
 		},
 		.driver_data = (unsigned long *)BYT_RT5640_IN1_MAP,
 	},
 	{}
 };

 static int byt_rt5640_init(struct snd_soc_pcm_runtime *runtime)
 {
 	int ret;
 	struct snd_soc_codec *codec = runtime->codec;
 	struct snd_soc_card *card = runtime->card;
 	const struct snd_soc_dapm_route *custom_map;
 	int num_routes;

 	card->dapm.idle_bias_off = true;

 	rt5640_sel_asrc_clk_src(codec,
 				RT5640_DA_STEREO_FILTER |
 				RT5640_AD_STEREO_FILTER,
 				RT5640_CLK_SEL_ASRC);

 	ret = snd_soc_add_card_controls(card, byt_rt5640_controls,
 					ARRAY_SIZE(byt_rt5640_controls));
 	if (ret) {
 		dev_err(card->dev, "unable to add card controls\n");
 		return ret;
 	}

 	dmi_check_system(byt_rt5640_quirk_table);
 	switch (BYT_RT5640_MAP(byt_rt5640_quirk)) {
 	case BYT_RT5640_IN1_MAP:
 		custom_map = byt_rt5640_intmic_in1_map;
 		num_routes = ARRAY_SIZE(byt_rt5640_intmic_in1_map);
 		break;
 	case BYT_RT5640_DMIC2_MAP:
 		custom_map = byt_rt5640_intmic_dmic2_map;
 		num_routes = ARRAY_SIZE(byt_rt5640_intmic_dmic2_map);
 		break;
 	default:
 		custom_map = byt_rt5640_intmic_dmic1_map;
 		num_routes = ARRAY_SIZE(byt_rt5640_intmic_dmic1_map);
 	}

 	ret = snd_soc_dapm_add_routes(&card->dapm, custom_map, num_routes);
 	if (ret)
 		return ret;

 	if (byt_rt5640_quirk & BYT_RT5640_DMIC_EN) {
 		ret = rt5640_dmic_enable(codec, 0, 0);
 		if (ret)
 			return ret;
 	}

 	snd_soc_dapm_ignore_suspend(&card->dapm, "Headphone");
 	snd_soc_dapm_ignore_suspend(&card->dapm, "Speaker");

 	return ret;
 }

 static const struct snd_soc_pcm_stream byt_rt5640_dai_params = {
 	.formats = SNDRV_PCM_FMTBIT_S24_LE,
 	.rate_min = 48000,
 	.rate_max = 48000,
 	.channels_min = 2,
 	.channels_max = 2,
 };

 static int byt_rt5640_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;

 	/* 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);

 	/*
 	 * Default mode for SSP configuration is TDM 4 slot, override config
 	 * with explicit setting to I2S 2ch 24-bit. The word length is set with
 	 * dai_set_tdm_slot() since there is no other API exposed
 	 */
 	ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
 				  SND_SOC_DAIFMT_I2S     |
 				  SND_SOC_DAIFMT_NB_IF   |
 				  SND_SOC_DAIFMT_CBS_CFS
 				  );
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set format to I2S, err %d\n", ret);
 		return ret;
 	}

 	ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 24);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't set I2S config, err %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int byt_rt5640_aif1_startup(struct snd_pcm_substream *substream)
 {
 	return snd_pcm_hw_constraint_single(substream->runtime,
 			SNDRV_PCM_HW_PARAM_RATE, 48000);
 }

 static struct snd_soc_ops byt_rt5640_aif1_ops = {
 	.startup = byt_rt5640_aif1_startup,
 };

 static struct snd_soc_ops byt_rt5640_be_ssp2_ops = {
 	.hw_params = byt_rt5640_aif1_hw_params,
 };

 static struct snd_soc_dai_link byt_rt5640_dais[] = {
 	[MERR_DPCM_AUDIO] = {
 		.name = "Baytrail Audio Port",
 		.stream_name = "Baytrail Audio",
 		.cpu_dai_name = "media-cpu-dai",
 		.codec_dai_name = "snd-soc-dummy-dai",
 		.codec_name = "snd-soc-dummy",
 		.platform_name = "sst-mfld-platform",
 		.ignore_suspend = 1,
 		.dynamic = 1,
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
 		.ops = &byt_rt5640_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",
 		.ignore_suspend = 1,
 		.nonatomic = true,
 		.dynamic = 1,
 		.dpcm_playback = 1,
 		.ops = &byt_rt5640_aif1_ops,
 	},
 	[MERR_DPCM_COMPR] = {
 		.name = "Baytrail Compressed Port",
 		.stream_name = "Baytrail 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",
 		.be_id = 1,
 		.cpu_dai_name = "ssp2-port",
 		.platform_name = "sst-mfld-platform",
 		.no_pcm = 1,
 		.codec_dai_name = "rt5640-aif1",
 		.codec_name = "i2c-10EC5640:00", /* overwritten with HID */
 		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 						| SND_SOC_DAIFMT_CBS_CFS,
 		.be_hw_params_fixup = byt_rt5640_codec_fixup,
 		.ignore_suspend = 1,
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
 		.init = byt_rt5640_init,
 		.ops = &byt_rt5640_be_ssp2_ops,
 	},
 };

 /* SoC card */
 static struct snd_soc_card byt_rt5640_card = {
 	.name = "bytcr-rt5640",
 	.owner = THIS_MODULE,
 	.dai_link = byt_rt5640_dais,
 	.num_links = ARRAY_SIZE(byt_rt5640_dais),
 	.dapm_widgets = byt_rt5640_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(byt_rt5640_widgets),
 	.dapm_routes = byt_rt5640_audio_map,
 	.num_dapm_routes = ARRAY_SIZE(byt_rt5640_audio_map),
 	.fully_routed = true,
 };

 static char byt_rt5640_codec_name[16]; /* i2c-<HID>:00 with HID being 8 chars */

 static int snd_byt_rt5640_mc_probe(struct platform_device *pdev)
 {
 	int ret_val = 0;
 	struct sst_acpi_mach *mach;

 	/* register the soc card */
 	byt_rt5640_card.dev = &pdev->dev;
 	mach = byt_rt5640_card.dev->platform_data;

 	/* fixup codec name based on HID */
 	snprintf(byt_rt5640_codec_name, sizeof(byt_rt5640_codec_name),
 		 "%s%s%s", "i2c-", mach->id, ":00");
 	byt_rt5640_dais[MERR_DPCM_COMPR+1].codec_name = byt_rt5640_codec_name;

 	ret_val = devm_snd_soc_register_card(&pdev->dev, &byt_rt5640_card);

 	if (ret_val) {
 		dev_err(&pdev->dev, "devm_snd_soc_register_card failed %d\n",
 			ret_val);
 		return ret_val;
 	}
 	platform_set_drvdata(pdev, &byt_rt5640_card);
 	return ret_val;
 }

 static struct platform_driver snd_byt_rt5640_mc_driver = {
 	.driver = {
 		.name = "bytcr_rt5640",
 		.pm = &snd_soc_pm_ops,
 	},
 	.probe = snd_byt_rt5640_mc_probe,
 };

 module_platform_driver(snd_byt_rt5640_mc_driver);

 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail CR Machine driver");
 MODULE_AUTHOR("Subhransu S. Prusty <subhransu.s.prusty@intel.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:bytcr_rt5640");
	/*
	* byt_cr_dpcm_rt5640.c - ASoc Machine driver for Intel Byt CR platform
	*
	* Copyright (C) 2014 Intel Corp
	* Author: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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/init.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/acpi.h>
	#include <linux/device.h>
	#include <linux/dmi.h>
	#include <linux/slab.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/jack.h>
	#include "../../codecs/rt5640.h"
	#include "../atom/sst-atom-controls.h"
	#include "../common/sst-acpi.h"

	static const struct snd_soc_dapm_widget byt_rt5640_widgets[] = {
	SND_SOC_DAPM_HP("Headphone", NULL),
	SND_SOC_DAPM_MIC("Headset Mic", NULL),
	SND_SOC_DAPM_MIC("Internal Mic", NULL),
	SND_SOC_DAPM_SPK("Speaker", NULL),
	};

	static const struct snd_soc_dapm_route byt_rt5640_audio_map[] = {
	{"AIF1 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, "AIF1 Capture"},

	{"Headset Mic", NULL, "MICBIAS1"},
	{"IN2P", NULL, "Headset Mic"},
	{"Headphone", NULL, "HPOL"},
	{"Headphone", NULL, "HPOR"},
	{"Speaker", NULL, "SPOLP"},
	{"Speaker", NULL, "SPOLN"},
	{"Speaker", NULL, "SPORP"},
	{"Speaker", NULL, "SPORN"},
	};

	static const struct snd_soc_dapm_route byt_rt5640_intmic_dmic1_map[] = {
	{"DMIC1", NULL, "Internal Mic"},
	};

	static const struct snd_soc_dapm_route byt_rt5640_intmic_dmic2_map[] = {
	{"DMIC2", NULL, "Internal Mic"},
	};

	static const struct snd_soc_dapm_route byt_rt5640_intmic_in1_map[] = {
	{"Internal Mic", NULL, "MICBIAS1"},
	{"IN1P", NULL, "Internal Mic"},
	};

	enum {
	BYT_RT5640_DMIC1_MAP,
	BYT_RT5640_DMIC2_MAP,
	BYT_RT5640_IN1_MAP,
	};

	#define BYT_RT5640_MAP(quirk) ((quirk) & 0xff)
	#define BYT_RT5640_DMIC_EN BIT(16)

	static unsigned long byt_rt5640_quirk = BYT_RT5640_DMIC1_MAP \|
	BYT_RT5640_DMIC_EN;

	static const struct snd_kcontrol_new byt_rt5640_controls[] = {
	SOC_DAPM_PIN_SWITCH("Headphone"),
	SOC_DAPM_PIN_SWITCH("Headset Mic"),
	SOC_DAPM_PIN_SWITCH("Internal Mic"),
	SOC_DAPM_PIN_SWITCH("Speaker"),
	};

	static int byt_rt5640_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;

	snd_soc_dai_set_bclk_ratio(codec_dai, 50);

	ret = snd_soc_dai_set_sysclk(codec_dai, RT5640_SCLK_S_PLL1,
	params_rate(params) * 512,
	SND_SOC_CLOCK_IN);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set codec clock %d\n", ret);
	return ret;
	}

	ret = snd_soc_dai_set_pll(codec_dai, 0, RT5640_PLL1_S_BCLK1,
	params_rate(params) * 50,
	params_rate(params) * 512);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set codec pll: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int byt_rt5640_quirk_cb(const struct dmi_system_id *id)
	{
	byt_rt5640_quirk = (unsigned long)id->driver_data;
	return 1;
	}

	static const struct dmi_system_id byt_rt5640_quirk_table[] = {
	{
	.callback = byt_rt5640_quirk_cb,
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
	DMI_MATCH(DMI_PRODUCT_NAME, "T100TA"),
	},
	.driver_data = (unsigned long *)BYT_RT5640_IN1_MAP,
	},
	{
	.callback = byt_rt5640_quirk_cb,
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "DellInc."),
	DMI_MATCH(DMI_PRODUCT_NAME, "Venue 8 Pro 5830"),
	},
	.driver_data = (unsigned long *)(BYT_RT5640_DMIC2_MAP \|
	BYT_RT5640_DMIC_EN),
	},
	{
	.callback = byt_rt5640_quirk_cb,
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
	DMI_MATCH(DMI_PRODUCT_NAME, "HP ElitePad 1000 G2"),
	},
	.driver_data = (unsigned long *)BYT_RT5640_IN1_MAP,
	},
	{}
	};

	static int byt_rt5640_init(struct snd_soc_pcm_runtime *runtime)
	{
	int ret;
	struct snd_soc_codec *codec = runtime->codec;
	struct snd_soc_card *card = runtime->card;
	const struct snd_soc_dapm_route *custom_map;
	int num_routes;

	card->dapm.idle_bias_off = true;

	rt5640_sel_asrc_clk_src(codec,
	RT5640_DA_STEREO_FILTER \|
	RT5640_AD_STEREO_FILTER,
	RT5640_CLK_SEL_ASRC);

	ret = snd_soc_add_card_controls(card, byt_rt5640_controls,
	ARRAY_SIZE(byt_rt5640_controls));
	if (ret) {
	dev_err(card->dev, "unable to add card controls\n");
	return ret;
	}

	dmi_check_system(byt_rt5640_quirk_table);
	switch (BYT_RT5640_MAP(byt_rt5640_quirk)) {
	case BYT_RT5640_IN1_MAP:
	custom_map = byt_rt5640_intmic_in1_map;
	num_routes = ARRAY_SIZE(byt_rt5640_intmic_in1_map);
	break;
	case BYT_RT5640_DMIC2_MAP:
	custom_map = byt_rt5640_intmic_dmic2_map;
	num_routes = ARRAY_SIZE(byt_rt5640_intmic_dmic2_map);
	break;
	default:
	custom_map = byt_rt5640_intmic_dmic1_map;
	num_routes = ARRAY_SIZE(byt_rt5640_intmic_dmic1_map);
	}

	ret = snd_soc_dapm_add_routes(&card->dapm, custom_map, num_routes);
	if (ret)
	return ret;

	if (byt_rt5640_quirk & BYT_RT5640_DMIC_EN) {
	ret = rt5640_dmic_enable(codec, 0, 0);
	if (ret)
	return ret;
	}

	snd_soc_dapm_ignore_suspend(&card->dapm, "Headphone");
	snd_soc_dapm_ignore_suspend(&card->dapm, "Speaker");

	return ret;
	}

	static const struct snd_soc_pcm_stream byt_rt5640_dai_params = {
	.formats = SNDRV_PCM_FMTBIT_S24_LE,
	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	};

	static int byt_rt5640_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;

	/* 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);

	/*
	* Default mode for SSP configuration is TDM 4 slot, override config
	* with explicit setting to I2S 2ch 24-bit. The word length is set with
	* dai_set_tdm_slot() since there is no other API exposed
	*/
	ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
	SND_SOC_DAIFMT_I2S \|
	SND_SOC_DAIFMT_NB_IF \|
	SND_SOC_DAIFMT_CBS_CFS
	);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set format to I2S, err %d\n", ret);
	return ret;
	}

	ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 24);
	if (ret < 0) {
	dev_err(rtd->dev, "can't set I2S config, err %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int byt_rt5640_aif1_startup(struct snd_pcm_substream *substream)
	{
	return snd_pcm_hw_constraint_single(substream->runtime,
	SNDRV_PCM_HW_PARAM_RATE, 48000);
	}

	static struct snd_soc_ops byt_rt5640_aif1_ops = {
	.startup = byt_rt5640_aif1_startup,
	};

	static struct snd_soc_ops byt_rt5640_be_ssp2_ops = {
	.hw_params = byt_rt5640_aif1_hw_params,
	};

	static struct snd_soc_dai_link byt_rt5640_dais[] = {
	[MERR_DPCM_AUDIO] = {
	.name = "Baytrail Audio Port",
	.stream_name = "Baytrail Audio",
	.cpu_dai_name = "media-cpu-dai",
	.codec_dai_name = "snd-soc-dummy-dai",
	.codec_name = "snd-soc-dummy",
	.platform_name = "sst-mfld-platform",
	.ignore_suspend = 1,
	.dynamic = 1,
	.dpcm_playback = 1,
	.dpcm_capture = 1,
	.ops = &byt_rt5640_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",
	.ignore_suspend = 1,
	.nonatomic = true,
	.dynamic = 1,
	.dpcm_playback = 1,
	.ops = &byt_rt5640_aif1_ops,
	},
	[MERR_DPCM_COMPR] = {
	.name = "Baytrail Compressed Port",
	.stream_name = "Baytrail 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",
	.be_id = 1,
	.cpu_dai_name = "ssp2-port",
	.platform_name = "sst-mfld-platform",
	.no_pcm = 1,
	.codec_dai_name = "rt5640-aif1",
	.codec_name = "i2c-10EC5640:00", /* overwritten with HID */
	.dai_fmt = SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_NF
	\| SND_SOC_DAIFMT_CBS_CFS,
	.be_hw_params_fixup = byt_rt5640_codec_fixup,
	.ignore_suspend = 1,
	.dpcm_playback = 1,
	.dpcm_capture = 1,
	.init = byt_rt5640_init,
	.ops = &byt_rt5640_be_ssp2_ops,
	},
	};

	/* SoC card */
	static struct snd_soc_card byt_rt5640_card = {
	.name = "bytcr-rt5640",
	.owner = THIS_MODULE,
	.dai_link = byt_rt5640_dais,
	.num_links = ARRAY_SIZE(byt_rt5640_dais),
	.dapm_widgets = byt_rt5640_widgets,
	.num_dapm_widgets = ARRAY_SIZE(byt_rt5640_widgets),
	.dapm_routes = byt_rt5640_audio_map,
	.num_dapm_routes = ARRAY_SIZE(byt_rt5640_audio_map),
	.fully_routed = true,
	};

	static char byt_rt5640_codec_name[16]; /* i2c-<HID>:00 with HID being 8 chars */

	static int snd_byt_rt5640_mc_probe(struct platform_device *pdev)
	{
	int ret_val = 0;
	struct sst_acpi_mach *mach;

	/* register the soc card */
	byt_rt5640_card.dev = &pdev->dev;
	mach = byt_rt5640_card.dev->platform_data;

	/* fixup codec name based on HID */
	snprintf(byt_rt5640_codec_name, sizeof(byt_rt5640_codec_name),
	"%s%s%s", "i2c-", mach->id, ":00");
	byt_rt5640_dais[MERR_DPCM_COMPR+1].codec_name = byt_rt5640_codec_name;

	ret_val = devm_snd_soc_register_card(&pdev->dev, &byt_rt5640_card);

	if (ret_val) {
	dev_err(&pdev->dev, "devm_snd_soc_register_card failed %d\n",
	ret_val);
	return ret_val;
	}
	platform_set_drvdata(pdev, &byt_rt5640_card);
	return ret_val;
	}

	static struct platform_driver snd_byt_rt5640_mc_driver = {
	.driver = {
	.name = "bytcr_rt5640",
	.pm = &snd_soc_pm_ops,
	},
	.probe = snd_byt_rt5640_mc_probe,
	};

	module_platform_driver(snd_byt_rt5640_mc_driver);

	MODULE_DESCRIPTION("ASoC Intel(R) Baytrail CR Machine driver");
	MODULE_AUTHOR("Subhransu S. Prusty <subhransu.s.prusty@intel.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:bytcr_rt5640");