sound/soc/tegra/tegra_rt5677.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
 * tegra_rt5677.c - Tegra machine ASoC driver for boards using RT5677 codec.
  *
  * Copyright (c) 2014, The Chromium OS Authors.  All rights reserved.
  *
  * Based on code copyright/by:
  *
  * Copyright (C) 2010-2012 - NVIDIA, Inc.
  * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net>
  * (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
  * Copyright 2007 Wolfson Microelectronics PLC.
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>

 #include <sound/core.h>
 #include <sound/jack.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 #include "../codecs/rt5677.h"

 #include "tegra_asoc_utils.h"

 #define DRV_NAME "tegra-snd-rt5677"

 struct tegra_rt5677 {
 	struct tegra_asoc_utils_data util_data;
 	int gpio_hp_det;
 	int gpio_hp_en;
 	int gpio_mic_present;
 	int gpio_dmic_clk_en;
 };

 static int tegra_rt5677_asoc_hw_params(struct snd_pcm_substream *substream,
 					struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
 	struct snd_soc_card *card = rtd->card;
 	struct tegra_rt5677 *machine = snd_soc_card_get_drvdata(card);
 	int srate, mclk, err;

 	srate = params_rate(params);
 	mclk = 256 * srate;

 	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
 	if (err < 0) {
 		dev_err(card->dev, "Can't configure clocks\n");
 		return err;
 	}

 	err = snd_soc_dai_set_sysclk(codec_dai, RT5677_SCLK_S_MCLK, mclk,
 					SND_SOC_CLOCK_IN);
 	if (err < 0) {
 		dev_err(card->dev, "codec_dai clock not set\n");
 		return err;
 	}

 	return 0;
 }

 static int tegra_rt5677_event_hp(struct snd_soc_dapm_widget *w,
 			struct snd_kcontrol *k, int event)
 {
 	struct snd_soc_dapm_context *dapm = w->dapm;
 	struct snd_soc_card *card = dapm->card;
 	struct tegra_rt5677 *machine = snd_soc_card_get_drvdata(card);

 	if (!gpio_is_valid(machine->gpio_hp_en))
 		return 0;

 	gpio_set_value_cansleep(machine->gpio_hp_en,
 		SND_SOC_DAPM_EVENT_ON(event));

 	return 0;
 }

 static const struct snd_soc_ops tegra_rt5677_ops = {
 	.hw_params = tegra_rt5677_asoc_hw_params,
 };

 static struct snd_soc_jack tegra_rt5677_hp_jack;

 static struct snd_soc_jack_pin tegra_rt5677_hp_jack_pins = {
 	.pin = "Headphone",
 	.mask = SND_JACK_HEADPHONE,
 };
 static struct snd_soc_jack_gpio tegra_rt5677_hp_jack_gpio = {
 	.name = "Headphone detection",
 	.report = SND_JACK_HEADPHONE,
 	.debounce_time = 150,
 };

 static struct snd_soc_jack tegra_rt5677_mic_jack;

 static struct snd_soc_jack_pin tegra_rt5677_mic_jack_pins = {
 	.pin = "Headset Mic",
 	.mask = SND_JACK_MICROPHONE,
 };

 static struct snd_soc_jack_gpio tegra_rt5677_mic_jack_gpio = {
 	.name = "Headset Mic detection",
 	.report = SND_JACK_MICROPHONE,
 	.debounce_time = 150,
 	.invert = 1
 };

 static const struct snd_soc_dapm_widget tegra_rt5677_dapm_widgets[] = {
 	SND_SOC_DAPM_SPK("Speaker", NULL),
 	SND_SOC_DAPM_HP("Headphone", tegra_rt5677_event_hp),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
 	SND_SOC_DAPM_MIC("Internal Mic 1", NULL),
 	SND_SOC_DAPM_MIC("Internal Mic 2", NULL),
 };

 static const struct snd_kcontrol_new tegra_rt5677_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Speaker"),
 	SOC_DAPM_PIN_SWITCH("Headphone"),
 	SOC_DAPM_PIN_SWITCH("Headset Mic"),
 	SOC_DAPM_PIN_SWITCH("Internal Mic 1"),
 	SOC_DAPM_PIN_SWITCH("Internal Mic 2"),
 };

 static int tegra_rt5677_asoc_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct tegra_rt5677 *machine = snd_soc_card_get_drvdata(rtd->card);

 	snd_soc_card_jack_new(rtd->card, "Headphone Jack", SND_JACK_HEADPHONE,
 			      &tegra_rt5677_hp_jack,
 			      &tegra_rt5677_hp_jack_pins, 1);

 	if (gpio_is_valid(machine->gpio_hp_det)) {
 		tegra_rt5677_hp_jack_gpio.gpio = machine->gpio_hp_det;
 		snd_soc_jack_add_gpios(&tegra_rt5677_hp_jack, 1,
 				&tegra_rt5677_hp_jack_gpio);
 	}


 	snd_soc_card_jack_new(rtd->card, "Mic Jack", SND_JACK_MICROPHONE,
 			      &tegra_rt5677_mic_jack,
 			      &tegra_rt5677_mic_jack_pins, 1);

 	if (gpio_is_valid(machine->gpio_mic_present)) {
 		tegra_rt5677_mic_jack_gpio.gpio = machine->gpio_mic_present;
 		snd_soc_jack_add_gpios(&tegra_rt5677_mic_jack, 1,
 				&tegra_rt5677_mic_jack_gpio);
 	}

 	snd_soc_dapm_force_enable_pin(&rtd->card->dapm, "MICBIAS1");

 	return 0;
 }

 SND_SOC_DAILINK_DEFS(pcm,
 	DAILINK_COMP_ARRAY(COMP_EMPTY()),
 	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "rt5677-aif1")),
 	DAILINK_COMP_ARRAY(COMP_EMPTY()));

 static struct snd_soc_dai_link tegra_rt5677_dai = {
 	.name = "RT5677",
 	.stream_name = "RT5677 PCM",
 	.init = tegra_rt5677_asoc_init,
 	.ops = &tegra_rt5677_ops,
 	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_CBS_CFS,
 	SND_SOC_DAILINK_REG(pcm),
 };

 static struct snd_soc_card snd_soc_tegra_rt5677 = {
 	.name = "tegra-rt5677",
 	.driver_name = "tegra",
 	.owner = THIS_MODULE,
 	.dai_link = &tegra_rt5677_dai,
 	.num_links = 1,
 	.controls = tegra_rt5677_controls,
 	.num_controls = ARRAY_SIZE(tegra_rt5677_controls),
 	.dapm_widgets = tegra_rt5677_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(tegra_rt5677_dapm_widgets),
 	.fully_routed = true,
 };

 static int tegra_rt5677_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct snd_soc_card *card = &snd_soc_tegra_rt5677;
 	struct tegra_rt5677 *machine;
 	int ret;

 	machine = devm_kzalloc(&pdev->dev,
 			sizeof(struct tegra_rt5677), GFP_KERNEL);
 	if (!machine)
 		return -ENOMEM;

 	card->dev = &pdev->dev;
 	snd_soc_card_set_drvdata(card, machine);

 	machine->gpio_hp_det = of_get_named_gpio(np, "nvidia,hp-det-gpios", 0);
 	if (machine->gpio_hp_det == -EPROBE_DEFER)
 		return -EPROBE_DEFER;

 	machine->gpio_mic_present = of_get_named_gpio(np,
 			"nvidia,mic-present-gpios", 0);
 	if (machine->gpio_mic_present == -EPROBE_DEFER)
 		return -EPROBE_DEFER;

 	machine->gpio_hp_en = of_get_named_gpio(np, "nvidia,hp-en-gpios", 0);
 	if (machine->gpio_hp_en == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
 	if (gpio_is_valid(machine->gpio_hp_en)) {
 		ret = devm_gpio_request_one(&pdev->dev, machine->gpio_hp_en,
 				GPIOF_OUT_INIT_LOW, "hp_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get hp_en gpio\n");
 			return ret;
 		}
 	}

 	machine->gpio_dmic_clk_en = of_get_named_gpio(np,
 		"nvidia,dmic-clk-en-gpios", 0);
 	if (machine->gpio_dmic_clk_en == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
 	if (gpio_is_valid(machine->gpio_dmic_clk_en)) {
 		ret = devm_gpio_request_one(&pdev->dev,
 				machine->gpio_dmic_clk_en,
 				GPIOF_OUT_INIT_HIGH, "dmic_clk_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get dmic_clk_en gpio\n");
 			return ret;
 		}
 	}

 	ret = snd_soc_of_parse_card_name(card, "nvidia,model");
 	if (ret)
 		goto err;

 	ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
 	if (ret)
 		goto err;

 	tegra_rt5677_dai.codecs->of_node = of_parse_phandle(np,
 			"nvidia,audio-codec", 0);
 	if (!tegra_rt5677_dai.codecs->of_node) {
 		dev_err(&pdev->dev,
 			"Property 'nvidia,audio-codec' missing or invalid\n");
 		ret = -EINVAL;
 		goto err;
 	}

 	tegra_rt5677_dai.cpus->of_node = of_parse_phandle(np,
 			"nvidia,i2s-controller", 0);
 	if (!tegra_rt5677_dai.cpus->of_node) {
 		dev_err(&pdev->dev,
 			"Property 'nvidia,i2s-controller' missing or invalid\n");
 		ret = -EINVAL;
 		goto err_put_codec_of_node;
 	}
 	tegra_rt5677_dai.platforms->of_node = tegra_rt5677_dai.cpus->of_node;

 	ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
 	if (ret)
 		goto err_put_cpu_of_node;

 	ret = snd_soc_register_card(card);
 	if (ret) {
 		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
 			ret);
 		goto err_put_cpu_of_node;
 	}

 	return 0;

 err_put_cpu_of_node:
 	of_node_put(tegra_rt5677_dai.cpus->of_node);
 	tegra_rt5677_dai.cpus->of_node = NULL;
 	tegra_rt5677_dai.platforms->of_node = NULL;
 err_put_codec_of_node:
 	of_node_put(tegra_rt5677_dai.codecs->of_node);
 	tegra_rt5677_dai.codecs->of_node = NULL;
 err:
 	return ret;
 }

 static int tegra_rt5677_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);

 	snd_soc_unregister_card(card);

 	tegra_rt5677_dai.platforms->of_node = NULL;
 	of_node_put(tegra_rt5677_dai.codecs->of_node);
 	tegra_rt5677_dai.codecs->of_node = NULL;
 	of_node_put(tegra_rt5677_dai.cpus->of_node);
 	tegra_rt5677_dai.cpus->of_node = NULL;

 	return 0;
 }

 static const struct of_device_id tegra_rt5677_of_match[] = {
 	{ .compatible = "nvidia,tegra-audio-rt5677", },
 	{},
 };

 static struct platform_driver tegra_rt5677_driver = {
 	.driver = {
 		.name = DRV_NAME,
 		.pm = &snd_soc_pm_ops,
 		.of_match_table = tegra_rt5677_of_match,
 	},
 	.probe = tegra_rt5677_probe,
 	.remove = tegra_rt5677_remove,
 };
 module_platform_driver(tegra_rt5677_driver);

 MODULE_AUTHOR("Anatol Pomozov <anatol@google.com>");
 MODULE_DESCRIPTION("Tegra+RT5677 machine ASoC driver");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:" DRV_NAME);
 MODULE_DEVICE_TABLE(of, tegra_rt5677_of_match);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* tegra_rt5677.c - Tegra machine ASoC driver for boards using RT5677 codec.
	*
	* Copyright (c) 2014, The Chromium OS Authors. All rights reserved.
	*
	* Based on code copyright/by:
	*
	* Copyright (C) 2010-2012 - NVIDIA, Inc.
	* Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net>
	* (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
	* Copyright 2007 Wolfson Microelectronics PLC.
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/of_gpio.h>

	#include <sound/core.h>
	#include <sound/jack.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	#include "../codecs/rt5677.h"

	#include "tegra_asoc_utils.h"

	#define DRV_NAME "tegra-snd-rt5677"

	struct tegra_rt5677 {
	struct tegra_asoc_utils_data util_data;
	int gpio_hp_det;
	int gpio_hp_en;
	int gpio_mic_present;
	int gpio_dmic_clk_en;
	};

	static int tegra_rt5677_asoc_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
	struct snd_soc_card *card = rtd->card;
	struct tegra_rt5677 *machine = snd_soc_card_get_drvdata(card);
	int srate, mclk, err;

	srate = params_rate(params);
	mclk = 256 * srate;

	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
	if (err < 0) {
	dev_err(card->dev, "Can't configure clocks\n");
	return err;
	}

	err = snd_soc_dai_set_sysclk(codec_dai, RT5677_SCLK_S_MCLK, mclk,
	SND_SOC_CLOCK_IN);
	if (err < 0) {
	dev_err(card->dev, "codec_dai clock not set\n");
	return err;
	}

	return 0;
	}

	static int tegra_rt5677_event_hp(struct snd_soc_dapm_widget *w,
	struct snd_kcontrol *k, int event)
	{
	struct snd_soc_dapm_context *dapm = w->dapm;
	struct snd_soc_card *card = dapm->card;
	struct tegra_rt5677 *machine = snd_soc_card_get_drvdata(card);

	if (!gpio_is_valid(machine->gpio_hp_en))
	return 0;

	gpio_set_value_cansleep(machine->gpio_hp_en,
	SND_SOC_DAPM_EVENT_ON(event));

	return 0;
	}

	static const struct snd_soc_ops tegra_rt5677_ops = {
	.hw_params = tegra_rt5677_asoc_hw_params,
	};

	static struct snd_soc_jack tegra_rt5677_hp_jack;

	static struct snd_soc_jack_pin tegra_rt5677_hp_jack_pins = {
	.pin = "Headphone",
	.mask = SND_JACK_HEADPHONE,
	};
	static struct snd_soc_jack_gpio tegra_rt5677_hp_jack_gpio = {
	.name = "Headphone detection",
	.report = SND_JACK_HEADPHONE,
	.debounce_time = 150,
	};

	static struct snd_soc_jack tegra_rt5677_mic_jack;

	static struct snd_soc_jack_pin tegra_rt5677_mic_jack_pins = {
	.pin = "Headset Mic",
	.mask = SND_JACK_MICROPHONE,
	};

	static struct snd_soc_jack_gpio tegra_rt5677_mic_jack_gpio = {
	.name = "Headset Mic detection",
	.report = SND_JACK_MICROPHONE,
	.debounce_time = 150,
	.invert = 1
	};

	static const struct snd_soc_dapm_widget tegra_rt5677_dapm_widgets[] = {
	SND_SOC_DAPM_SPK("Speaker", NULL),
	SND_SOC_DAPM_HP("Headphone", tegra_rt5677_event_hp),
	SND_SOC_DAPM_MIC("Headset Mic", NULL),
	SND_SOC_DAPM_MIC("Internal Mic 1", NULL),
	SND_SOC_DAPM_MIC("Internal Mic 2", NULL),
	};

	static const struct snd_kcontrol_new tegra_rt5677_controls[] = {
	SOC_DAPM_PIN_SWITCH("Speaker"),
	SOC_DAPM_PIN_SWITCH("Headphone"),
	SOC_DAPM_PIN_SWITCH("Headset Mic"),
	SOC_DAPM_PIN_SWITCH("Internal Mic 1"),
	SOC_DAPM_PIN_SWITCH("Internal Mic 2"),
	};

	static int tegra_rt5677_asoc_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct tegra_rt5677 *machine = snd_soc_card_get_drvdata(rtd->card);

	snd_soc_card_jack_new(rtd->card, "Headphone Jack", SND_JACK_HEADPHONE,
	&tegra_rt5677_hp_jack,
	&tegra_rt5677_hp_jack_pins, 1);

	if (gpio_is_valid(machine->gpio_hp_det)) {
	tegra_rt5677_hp_jack_gpio.gpio = machine->gpio_hp_det;
	snd_soc_jack_add_gpios(&tegra_rt5677_hp_jack, 1,
	&tegra_rt5677_hp_jack_gpio);
	}


	snd_soc_card_jack_new(rtd->card, "Mic Jack", SND_JACK_MICROPHONE,
	&tegra_rt5677_mic_jack,
	&tegra_rt5677_mic_jack_pins, 1);

	if (gpio_is_valid(machine->gpio_mic_present)) {
	tegra_rt5677_mic_jack_gpio.gpio = machine->gpio_mic_present;
	snd_soc_jack_add_gpios(&tegra_rt5677_mic_jack, 1,
	&tegra_rt5677_mic_jack_gpio);
	}

	snd_soc_dapm_force_enable_pin(&rtd->card->dapm, "MICBIAS1");

	return 0;
	}

	SND_SOC_DAILINK_DEFS(pcm,
	DAILINK_COMP_ARRAY(COMP_EMPTY()),
	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "rt5677-aif1")),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

	static struct snd_soc_dai_link tegra_rt5677_dai = {
	.name = "RT5677",
	.stream_name = "RT5677 PCM",
	.init = tegra_rt5677_asoc_init,
	.ops = &tegra_rt5677_ops,
	.dai_fmt = SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_CBS_CFS,
	SND_SOC_DAILINK_REG(pcm),
	};

	static struct snd_soc_card snd_soc_tegra_rt5677 = {
	.name = "tegra-rt5677",
	.driver_name = "tegra",
	.owner = THIS_MODULE,
	.dai_link = &tegra_rt5677_dai,
	.num_links = 1,
	.controls = tegra_rt5677_controls,
	.num_controls = ARRAY_SIZE(tegra_rt5677_controls),
	.dapm_widgets = tegra_rt5677_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(tegra_rt5677_dapm_widgets),
	.fully_routed = true,
	};

	static int tegra_rt5677_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct snd_soc_card *card = &snd_soc_tegra_rt5677;
	struct tegra_rt5677 *machine;
	int ret;

	machine = devm_kzalloc(&pdev->dev,
	sizeof(struct tegra_rt5677), GFP_KERNEL);
	if (!machine)
	return -ENOMEM;

	card->dev = &pdev->dev;
	snd_soc_card_set_drvdata(card, machine);

	machine->gpio_hp_det = of_get_named_gpio(np, "nvidia,hp-det-gpios", 0);
	if (machine->gpio_hp_det == -EPROBE_DEFER)
	return -EPROBE_DEFER;

	machine->gpio_mic_present = of_get_named_gpio(np,
	"nvidia,mic-present-gpios", 0);
	if (machine->gpio_mic_present == -EPROBE_DEFER)
	return -EPROBE_DEFER;

	machine->gpio_hp_en = of_get_named_gpio(np, "nvidia,hp-en-gpios", 0);
	if (machine->gpio_hp_en == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	if (gpio_is_valid(machine->gpio_hp_en)) {
	ret = devm_gpio_request_one(&pdev->dev, machine->gpio_hp_en,
	GPIOF_OUT_INIT_LOW, "hp_en");
	if (ret) {
	dev_err(card->dev, "cannot get hp_en gpio\n");
	return ret;
	}
	}

	machine->gpio_dmic_clk_en = of_get_named_gpio(np,
	"nvidia,dmic-clk-en-gpios", 0);
	if (machine->gpio_dmic_clk_en == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	if (gpio_is_valid(machine->gpio_dmic_clk_en)) {
	ret = devm_gpio_request_one(&pdev->dev,
	machine->gpio_dmic_clk_en,
	GPIOF_OUT_INIT_HIGH, "dmic_clk_en");
	if (ret) {
	dev_err(card->dev, "cannot get dmic_clk_en gpio\n");
	return ret;
	}
	}

	ret = snd_soc_of_parse_card_name(card, "nvidia,model");
	if (ret)
	goto err;

	ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
	if (ret)
	goto err;

	tegra_rt5677_dai.codecs->of_node = of_parse_phandle(np,
	"nvidia,audio-codec", 0);
	if (!tegra_rt5677_dai.codecs->of_node) {
	dev_err(&pdev->dev,
	"Property 'nvidia,audio-codec' missing or invalid\n");
	ret = -EINVAL;
	goto err;
	}

	tegra_rt5677_dai.cpus->of_node = of_parse_phandle(np,
	"nvidia,i2s-controller", 0);
	if (!tegra_rt5677_dai.cpus->of_node) {
	dev_err(&pdev->dev,
	"Property 'nvidia,i2s-controller' missing or invalid\n");
	ret = -EINVAL;
	goto err_put_codec_of_node;
	}
	tegra_rt5677_dai.platforms->of_node = tegra_rt5677_dai.cpus->of_node;

	ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
	if (ret)
	goto err_put_cpu_of_node;

	ret = snd_soc_register_card(card);
	if (ret) {
	dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
	ret);
	goto err_put_cpu_of_node;
	}

	return 0;

	err_put_cpu_of_node:
	of_node_put(tegra_rt5677_dai.cpus->of_node);
	tegra_rt5677_dai.cpus->of_node = NULL;
	tegra_rt5677_dai.platforms->of_node = NULL;
	err_put_codec_of_node:
	of_node_put(tegra_rt5677_dai.codecs->of_node);
	tegra_rt5677_dai.codecs->of_node = NULL;
	err:
	return ret;
	}

	static int tegra_rt5677_remove(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	snd_soc_unregister_card(card);

	tegra_rt5677_dai.platforms->of_node = NULL;
	of_node_put(tegra_rt5677_dai.codecs->of_node);
	tegra_rt5677_dai.codecs->of_node = NULL;
	of_node_put(tegra_rt5677_dai.cpus->of_node);
	tegra_rt5677_dai.cpus->of_node = NULL;

	return 0;
	}

	static const struct of_device_id tegra_rt5677_of_match[] = {
	{ .compatible = "nvidia,tegra-audio-rt5677", },
	{},
	};

	static struct platform_driver tegra_rt5677_driver = {
	.driver = {
	.name = DRV_NAME,
	.pm = &snd_soc_pm_ops,
	.of_match_table = tegra_rt5677_of_match,
	},
	.probe = tegra_rt5677_probe,
	.remove = tegra_rt5677_remove,
	};
	module_platform_driver(tegra_rt5677_driver);

	MODULE_AUTHOR("Anatol Pomozov <anatol@google.com>");
	MODULE_DESCRIPTION("Tegra+RT5677 machine ASoC driver");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:" DRV_NAME);
	MODULE_DEVICE_TABLE(of, tegra_rt5677_of_match);