sound/soc/tegra/tegra_wm8903.c - arm/linux - Git at Google

 /*
  * tegra_wm8903.c - Tegra machine ASoC driver for boards using WM8903 codec.
  *
  * Author: Stephen Warren <swarren@nvidia.com>
  * Copyright (C) 2010-2012 - NVIDIA, Inc.
  *
  * Based on code copyright/by:
  *
  * (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
  *
  * Copyright 2007 Wolfson Microelectronics PLC.
  * Author: Graeme Gregory
  *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.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 as published by the Free Software Foundation.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #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/wm8903.h"

 #include "tegra_asoc_utils.h"

 #define DRV_NAME "tegra-snd-wm8903"

 struct tegra_wm8903 {
 	int gpio_spkr_en;
 	int gpio_hp_det;
 	int gpio_hp_mute;
 	int gpio_int_mic_en;
 	int gpio_ext_mic_en;
 	struct tegra_asoc_utils_data util_data;
 };

 static int tegra_wm8903_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;
 	struct snd_soc_card *card = rtd->card;
 	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
 	int srate, mclk;
 	int err;

 	srate = params_rate(params);
 	switch (srate) {
 	case 64000:
 	case 88200:
 	case 96000:
 		mclk = 128 * srate;
 		break;
 	default:
 		mclk = 256 * srate;
 		break;
 	}
 	/* FIXME: Codec only requires >= 3MHz if OSR==0 */
 	while (mclk < 6000000)
 		mclk *= 2;

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

 	return 0;
 }

 static const struct snd_soc_ops tegra_wm8903_ops = {
 	.hw_params = tegra_wm8903_hw_params,
 };

 static struct snd_soc_jack tegra_wm8903_hp_jack;

 static struct snd_soc_jack_pin tegra_wm8903_hp_jack_pins[] = {
 	{
 		.pin = "Headphone Jack",
 		.mask = SND_JACK_HEADPHONE,
 	},
 };

 static struct snd_soc_jack_gpio tegra_wm8903_hp_jack_gpio = {
 	.name = "headphone detect",
 	.report = SND_JACK_HEADPHONE,
 	.debounce_time = 150,
 	.invert = 1,
 };

 static struct snd_soc_jack tegra_wm8903_mic_jack;

 static struct snd_soc_jack_pin tegra_wm8903_mic_jack_pins[] = {
 	{
 		.pin = "Mic Jack",
 		.mask = SND_JACK_MICROPHONE,
 	},
 };

 static int tegra_wm8903_event_int_spk(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_wm8903 *machine = snd_soc_card_get_drvdata(card);

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

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

 	return 0;
 }

 static int tegra_wm8903_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_wm8903 *machine = snd_soc_card_get_drvdata(card);

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

 	gpio_set_value_cansleep(machine->gpio_hp_mute,
 				!SND_SOC_DAPM_EVENT_ON(event));

 	return 0;
 }

 static const struct snd_soc_dapm_widget tegra_wm8903_dapm_widgets[] = {
 	SND_SOC_DAPM_SPK("Int Spk", tegra_wm8903_event_int_spk),
 	SND_SOC_DAPM_HP("Headphone Jack", tegra_wm8903_event_hp),
 	SND_SOC_DAPM_MIC("Mic Jack", NULL),
 };

 static const struct snd_kcontrol_new tegra_wm8903_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Int Spk"),
 };

 static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct snd_soc_card *card = rtd->card;
 	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);

 	if (gpio_is_valid(machine->gpio_hp_det)) {
 		tegra_wm8903_hp_jack_gpio.gpio = machine->gpio_hp_det;
 		snd_soc_card_jack_new(rtd->card, "Headphone Jack",
 				      SND_JACK_HEADPHONE, &tegra_wm8903_hp_jack,
 				      tegra_wm8903_hp_jack_pins,
 				      ARRAY_SIZE(tegra_wm8903_hp_jack_pins));
 		snd_soc_jack_add_gpios(&tegra_wm8903_hp_jack,
 					1,
 					&tegra_wm8903_hp_jack_gpio);
 	}

 	snd_soc_card_jack_new(rtd->card, "Mic Jack", SND_JACK_MICROPHONE,
 			      &tegra_wm8903_mic_jack,
 			      tegra_wm8903_mic_jack_pins,
 			      ARRAY_SIZE(tegra_wm8903_mic_jack_pins));
 	wm8903_mic_detect(codec, &tegra_wm8903_mic_jack, SND_JACK_MICROPHONE,
 				0);

 	snd_soc_dapm_force_enable_pin(&card->dapm, "MICBIAS");

 	return 0;
 }

 static int tegra_wm8903_remove(struct snd_soc_card *card)
 {
 	struct snd_soc_pcm_runtime *rtd =
 		snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = codec_dai->codec;

 	wm8903_mic_detect(codec, NULL, 0, 0);

 	return 0;
 }

 static struct snd_soc_dai_link tegra_wm8903_dai = {
 	.name = "WM8903",
 	.stream_name = "WM8903 PCM",
 	.codec_dai_name = "wm8903-hifi",
 	.init = tegra_wm8903_init,
 	.ops = &tegra_wm8903_ops,
 	.dai_fmt = SND_SOC_DAIFMT_I2S |
 		   SND_SOC_DAIFMT_NB_NF |
 		   SND_SOC_DAIFMT_CBS_CFS,
 };

 static struct snd_soc_card snd_soc_tegra_wm8903 = {
 	.name = "tegra-wm8903",
 	.owner = THIS_MODULE,
 	.dai_link = &tegra_wm8903_dai,
 	.num_links = 1,
 	.remove = tegra_wm8903_remove,
 	.controls = tegra_wm8903_controls,
 	.num_controls = ARRAY_SIZE(tegra_wm8903_controls),
 	.dapm_widgets = tegra_wm8903_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(tegra_wm8903_dapm_widgets),
 	.fully_routed = true,
 };

 static int tegra_wm8903_driver_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct snd_soc_card *card = &snd_soc_tegra_wm8903;
 	struct tegra_wm8903 *machine;
 	int ret;

 	machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm8903),
 			       GFP_KERNEL);
 	if (!machine)
 		return -ENOMEM;

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

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

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

 	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_int_mic_en = of_get_named_gpio(np,
 						"nvidia,int-mic-en-gpios", 0);
 	if (machine->gpio_int_mic_en == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
 	if (gpio_is_valid(machine->gpio_int_mic_en)) {
 		/* Disable int mic; enable signal is active-high */
 		ret = devm_gpio_request_one(&pdev->dev,
 					    machine->gpio_int_mic_en,
 					    GPIOF_OUT_INIT_LOW, "int_mic_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get int_mic_en gpio\n");
 			return ret;
 		}
 	}

 	machine->gpio_ext_mic_en = of_get_named_gpio(np,
 						"nvidia,ext-mic-en-gpios", 0);
 	if (machine->gpio_ext_mic_en == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
 	if (gpio_is_valid(machine->gpio_ext_mic_en)) {
 		/* Enable ext mic; enable signal is active-low */
 		ret = devm_gpio_request_one(&pdev->dev,
 					    machine->gpio_ext_mic_en,
 					    GPIOF_OUT_INIT_LOW, "ext_mic_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get ext_mic_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_wm8903_dai.codec_of_node = of_parse_phandle(np,
 						"nvidia,audio-codec", 0);
 	if (!tegra_wm8903_dai.codec_of_node) {
 		dev_err(&pdev->dev,
 			"Property 'nvidia,audio-codec' missing or invalid\n");
 		ret = -EINVAL;
 		goto err;
 	}

 	tegra_wm8903_dai.cpu_of_node = of_parse_phandle(np,
 			"nvidia,i2s-controller", 0);
 	if (!tegra_wm8903_dai.cpu_of_node) {
 		dev_err(&pdev->dev,
 			"Property 'nvidia,i2s-controller' missing or invalid\n");
 		ret = -EINVAL;
 		goto err;
 	}

 	tegra_wm8903_dai.platform_of_node = tegra_wm8903_dai.cpu_of_node;

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

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

 	return 0;

 err_fini_utils:
 	tegra_asoc_utils_fini(&machine->util_data);
 err:
 	return ret;
 }

 static int tegra_wm8903_driver_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);

 	snd_soc_unregister_card(card);

 	tegra_asoc_utils_fini(&machine->util_data);

 	return 0;
 }

 static const struct of_device_id tegra_wm8903_of_match[] = {
 	{ .compatible = "nvidia,tegra-audio-wm8903", },
 	{},
 };

 static struct platform_driver tegra_wm8903_driver = {
 	.driver = {
 		.name = DRV_NAME,
 		.pm = &snd_soc_pm_ops,
 		.of_match_table = tegra_wm8903_of_match,
 	},
 	.probe = tegra_wm8903_driver_probe,
 	.remove = tegra_wm8903_driver_remove,
 };
 module_platform_driver(tegra_wm8903_driver);

 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 MODULE_DESCRIPTION("Tegra+WM8903 machine ASoC driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:" DRV_NAME);
 MODULE_DEVICE_TABLE(of, tegra_wm8903_of_match);
	/*
	* tegra_wm8903.c - Tegra machine ASoC driver for boards using WM8903 codec.
	*
	* Author: Stephen Warren <swarren@nvidia.com>
	* Copyright (C) 2010-2012 - NVIDIA, Inc.
	*
	* Based on code copyright/by:
	*
	* (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
	*
	* Copyright 2007 Wolfson Microelectronics PLC.
	* Author: Graeme Gregory
	* graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.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 as published by the Free Software Foundation.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#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/wm8903.h"

	#include "tegra_asoc_utils.h"

	#define DRV_NAME "tegra-snd-wm8903"

	struct tegra_wm8903 {
	int gpio_spkr_en;
	int gpio_hp_det;
	int gpio_hp_mute;
	int gpio_int_mic_en;
	int gpio_ext_mic_en;
	struct tegra_asoc_utils_data util_data;
	};

	static int tegra_wm8903_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;
	struct snd_soc_card *card = rtd->card;
	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
	int srate, mclk;
	int err;

	srate = params_rate(params);
	switch (srate) {
	case 64000:
	case 88200:
	case 96000:
	mclk = 128 * srate;
	break;
	default:
	mclk = 256 * srate;
	break;
	}
	/* FIXME: Codec only requires >= 3MHz if OSR==0 */
	while (mclk < 6000000)
	mclk *= 2;

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

	return 0;
	}

	static const struct snd_soc_ops tegra_wm8903_ops = {
	.hw_params = tegra_wm8903_hw_params,
	};

	static struct snd_soc_jack tegra_wm8903_hp_jack;

	static struct snd_soc_jack_pin tegra_wm8903_hp_jack_pins[] = {
	{
	.pin = "Headphone Jack",
	.mask = SND_JACK_HEADPHONE,
	},
	};

	static struct snd_soc_jack_gpio tegra_wm8903_hp_jack_gpio = {
	.name = "headphone detect",
	.report = SND_JACK_HEADPHONE,
	.debounce_time = 150,
	.invert = 1,
	};

	static struct snd_soc_jack tegra_wm8903_mic_jack;

	static struct snd_soc_jack_pin tegra_wm8903_mic_jack_pins[] = {
	{
	.pin = "Mic Jack",
	.mask = SND_JACK_MICROPHONE,
	},
	};

	static int tegra_wm8903_event_int_spk(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_wm8903 *machine = snd_soc_card_get_drvdata(card);

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

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

	return 0;
	}

	static int tegra_wm8903_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_wm8903 *machine = snd_soc_card_get_drvdata(card);

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

	gpio_set_value_cansleep(machine->gpio_hp_mute,
	!SND_SOC_DAPM_EVENT_ON(event));

	return 0;
	}

	static const struct snd_soc_dapm_widget tegra_wm8903_dapm_widgets[] = {
	SND_SOC_DAPM_SPK("Int Spk", tegra_wm8903_event_int_spk),
	SND_SOC_DAPM_HP("Headphone Jack", tegra_wm8903_event_hp),
	SND_SOC_DAPM_MIC("Mic Jack", NULL),
	};

	static const struct snd_kcontrol_new tegra_wm8903_controls[] = {
	SOC_DAPM_PIN_SWITCH("Int Spk"),
	};

	static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_codec *codec = codec_dai->codec;
	struct snd_soc_card *card = rtd->card;
	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);

	if (gpio_is_valid(machine->gpio_hp_det)) {
	tegra_wm8903_hp_jack_gpio.gpio = machine->gpio_hp_det;
	snd_soc_card_jack_new(rtd->card, "Headphone Jack",
	SND_JACK_HEADPHONE, &tegra_wm8903_hp_jack,
	tegra_wm8903_hp_jack_pins,
	ARRAY_SIZE(tegra_wm8903_hp_jack_pins));
	snd_soc_jack_add_gpios(&tegra_wm8903_hp_jack,
	1,
	&tegra_wm8903_hp_jack_gpio);
	}

	snd_soc_card_jack_new(rtd->card, "Mic Jack", SND_JACK_MICROPHONE,
	&tegra_wm8903_mic_jack,
	tegra_wm8903_mic_jack_pins,
	ARRAY_SIZE(tegra_wm8903_mic_jack_pins));
	wm8903_mic_detect(codec, &tegra_wm8903_mic_jack, SND_JACK_MICROPHONE,
	0);

	snd_soc_dapm_force_enable_pin(&card->dapm, "MICBIAS");

	return 0;
	}

	static int tegra_wm8903_remove(struct snd_soc_card *card)
	{
	struct snd_soc_pcm_runtime *rtd =
	snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_codec *codec = codec_dai->codec;

	wm8903_mic_detect(codec, NULL, 0, 0);

	return 0;
	}

	static struct snd_soc_dai_link tegra_wm8903_dai = {
	.name = "WM8903",
	.stream_name = "WM8903 PCM",
	.codec_dai_name = "wm8903-hifi",
	.init = tegra_wm8903_init,
	.ops = &tegra_wm8903_ops,
	.dai_fmt = SND_SOC_DAIFMT_I2S \|
	SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_CBS_CFS,
	};

	static struct snd_soc_card snd_soc_tegra_wm8903 = {
	.name = "tegra-wm8903",
	.owner = THIS_MODULE,
	.dai_link = &tegra_wm8903_dai,
	.num_links = 1,
	.remove = tegra_wm8903_remove,
	.controls = tegra_wm8903_controls,
	.num_controls = ARRAY_SIZE(tegra_wm8903_controls),
	.dapm_widgets = tegra_wm8903_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(tegra_wm8903_dapm_widgets),
	.fully_routed = true,
	};

	static int tegra_wm8903_driver_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct snd_soc_card *card = &snd_soc_tegra_wm8903;
	struct tegra_wm8903 *machine;
	int ret;

	machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm8903),
	GFP_KERNEL);
	if (!machine)
	return -ENOMEM;

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

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

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

	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_int_mic_en = of_get_named_gpio(np,
	"nvidia,int-mic-en-gpios", 0);
	if (machine->gpio_int_mic_en == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	if (gpio_is_valid(machine->gpio_int_mic_en)) {
	/* Disable int mic; enable signal is active-high */
	ret = devm_gpio_request_one(&pdev->dev,
	machine->gpio_int_mic_en,
	GPIOF_OUT_INIT_LOW, "int_mic_en");
	if (ret) {
	dev_err(card->dev, "cannot get int_mic_en gpio\n");
	return ret;
	}
	}

	machine->gpio_ext_mic_en = of_get_named_gpio(np,
	"nvidia,ext-mic-en-gpios", 0);
	if (machine->gpio_ext_mic_en == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	if (gpio_is_valid(machine->gpio_ext_mic_en)) {
	/* Enable ext mic; enable signal is active-low */
	ret = devm_gpio_request_one(&pdev->dev,
	machine->gpio_ext_mic_en,
	GPIOF_OUT_INIT_LOW, "ext_mic_en");
	if (ret) {
	dev_err(card->dev, "cannot get ext_mic_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_wm8903_dai.codec_of_node = of_parse_phandle(np,
	"nvidia,audio-codec", 0);
	if (!tegra_wm8903_dai.codec_of_node) {
	dev_err(&pdev->dev,
	"Property 'nvidia,audio-codec' missing or invalid\n");
	ret = -EINVAL;
	goto err;
	}

	tegra_wm8903_dai.cpu_of_node = of_parse_phandle(np,
	"nvidia,i2s-controller", 0);
	if (!tegra_wm8903_dai.cpu_of_node) {
	dev_err(&pdev->dev,
	"Property 'nvidia,i2s-controller' missing or invalid\n");
	ret = -EINVAL;
	goto err;
	}

	tegra_wm8903_dai.platform_of_node = tegra_wm8903_dai.cpu_of_node;

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

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

	return 0;

	err_fini_utils:
	tegra_asoc_utils_fini(&machine->util_data);
	err:
	return ret;
	}

	static int tegra_wm8903_driver_remove(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);

	snd_soc_unregister_card(card);

	tegra_asoc_utils_fini(&machine->util_data);

	return 0;
	}

	static const struct of_device_id tegra_wm8903_of_match[] = {
	{ .compatible = "nvidia,tegra-audio-wm8903", },
	{},
	};

	static struct platform_driver tegra_wm8903_driver = {
	.driver = {
	.name = DRV_NAME,
	.pm = &snd_soc_pm_ops,
	.of_match_table = tegra_wm8903_of_match,
	},
	.probe = tegra_wm8903_driver_probe,
	.remove = tegra_wm8903_driver_remove,
	};
	module_platform_driver(tegra_wm8903_driver);

	MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
	MODULE_DESCRIPTION("Tegra+WM8903 machine ASoC driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:" DRV_NAME);
	MODULE_DEVICE_TABLE(of, tegra_wm8903_of_match);