path: root/sound/soc/tegra/tegra_rt5640.c

/*
 * tegra_rt5640.c - Tegra machine ASoC driver for boards using ALC5640 codec.
 *
 * Author: Johnny Qiu <joqiu@nvidia.com>
 * Copyright (C) 2011-2012, NVIDIA, Inc.
 *
 * Based on code copyright/by:
 *
 * 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 <asm/mach-types.h>

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#ifdef CONFIG_SWITCH
#include <linux/switch.h>
#endif

#include <mach/tegra_rt5640_pdata.h>

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

#include "../codecs/rt5639.h"
#include "../codecs/rt5640.h"

#include "tegra_pcm.h"
#include "tegra_asoc_utils.h"

#define DRV_NAME "tegra-snd-rt5640"

#define GPIO_SPKR_EN    BIT(0)
#define GPIO_HP_MUTE    BIT(1)
#define GPIO_INT_MIC_EN BIT(2)
#define GPIO_EXT_MIC_EN BIT(3)
#define GPIO_HP_DET     BIT(4)

struct tegra_rt5640 {
	struct tegra_asoc_utils_data util_data;
	struct tegra_rt5640_platform_data *pdata;
	struct regulator *spk_reg;
	struct regulator *dmic_reg;
	struct regulator *cdc_en;
	int gpio_requested;
#ifdef CONFIG_SWITCH
	int jack_status;
#endif
};

static int tegra_rt5640_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_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_codec *codec = rtd->codec;
	struct snd_soc_card *card = codec->card;
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(card);
	int srate, mclk, i2s_daifmt;
	int err;

	srate = params_rate(params);
	mclk = 256 * srate;
	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
	if (err < 0) {
		if (!(machine->util_data.set_mclk % mclk)) {
			mclk = machine->util_data.set_mclk;
		} else {
			dev_err(card->dev, "Can't configure clocks\n");
			return err;
		}
	}

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 1);

	i2s_daifmt = SND_SOC_DAIFMT_NB_NF |
		     SND_SOC_DAIFMT_CBS_CFS;

	i2s_daifmt |= SND_SOC_DAIFMT_I2S;

	err = snd_soc_dai_set_fmt(codec_dai, i2s_daifmt);
	if (err < 0) {
		dev_err(card->dev, "codec_dai fmt not set\n");
		return err;
	}

	err = snd_soc_dai_set_fmt(cpu_dai, i2s_daifmt);
	if (err < 0) {
		dev_err(card->dev, "cpu_dai fmt not set\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 int tegra_bt_sco_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 *cpu_dai = rtd->cpu_dai;
	struct snd_soc_card *card = rtd->card;
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(card);
	int srate, mclk, min_mclk;
	int err;

	srate = params_rate(params);
	switch (srate) {
	case 11025:
	case 22050:
	case 44100:
	case 88200:
		mclk = 11289600;
		break;
	case 8000:
	case 16000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		mclk = 12288000;
		break;
	default:
		return -EINVAL;
	}
	min_mclk = 64 * srate;

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

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 1);

	err = snd_soc_dai_set_fmt(cpu_dai,
					SND_SOC_DAIFMT_DSP_A |
					SND_SOC_DAIFMT_NB_NF |
					SND_SOC_DAIFMT_CBS_CFS);
	if (err < 0) {
		dev_err(card->dev, "cpu_dai fmt not set\n");
		return err;
	}

	return 0;
}

static int tegra_spdif_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_card *card = rtd->card;
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(card);
	int srate, mclk, min_mclk;
	int err;

	srate = params_rate(params);
	switch (srate) {
	case 11025:
	case 22050:
	case 44100:
	case 88200:
		mclk = 11289600;
		break;
	case 8000:
	case 16000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		mclk = 12288000;
		break;
	default:
		return -EINVAL;
	}
	min_mclk = 128 * srate;

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

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 1);

	return 0;
}

static int tegra_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(rtd->card);

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 0);

	return 0;
}

static struct snd_soc_ops tegra_rt5640_ops = {
	.hw_params = tegra_rt5640_hw_params,
	.hw_free = tegra_hw_free,
};

static struct snd_soc_ops tegra_rt5640_bt_sco_ops = {
	.hw_params = tegra_bt_sco_hw_params,
	.hw_free = tegra_hw_free,
};

static struct snd_soc_ops tegra_spdif_ops = {
	.hw_params = tegra_spdif_hw_params,
	.hw_free = tegra_hw_free,
};

static struct snd_soc_jack tegra_rt5640_hp_jack;

static struct snd_soc_jack_gpio tegra_rt5640_hp_jack_gpio = {
	.name = "headphone detect",
	.report = SND_JACK_HEADPHONE,
	.debounce_time = 150,
	.invert = 1,
};

#ifdef CONFIG_SWITCH
/* These values are copied from Android WiredAccessoryObserver */
enum headset_state {
	BIT_NO_HEADSET = 0,
	BIT_HEADSET = (1 << 0),
	BIT_HEADSET_NO_MIC = (1 << 1),
};

static struct switch_dev tegra_rt5640_headset_switch = {
	.name = "h2w",
};

static int tegra_rt5640_jack_notifier(struct notifier_block *self,
			      unsigned long action, void *dev)
{
	struct snd_soc_jack *jack = dev;
	struct snd_soc_codec *codec = jack->codec;
	struct snd_soc_card *card = codec->card;
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(card);
	enum headset_state state = BIT_NO_HEADSET;
	unsigned char status_jack;

	if (jack == &tegra_rt5640_hp_jack) {
		if (action) {
			if (!strncmp(machine->pdata->codec_name, "rt5639", 6))
				status_jack = rt5639_headset_detect(codec, 1);
			else if (!strncmp(machine->pdata->codec_name, "rt5640",
									    6))
				status_jack = rt5640_headset_detect(codec, 1);

			machine->jack_status &= ~SND_JACK_HEADPHONE;
			machine->jack_status &= ~SND_JACK_MICROPHONE;
			if (status_jack == RT5639_HEADPHO_DET ||
			    status_jack == RT5640_HEADPHO_DET)
					machine->jack_status |=
							SND_JACK_HEADPHONE;
			else if (status_jack == RT5639_HEADSET_DET ||
				 status_jack == RT5640_HEADSET_DET) {
					machine->jack_status |=
							SND_JACK_HEADPHONE;
					machine->jack_status |=
							SND_JACK_MICROPHONE;
			}
		} else {
			if (!strncmp(machine->pdata->codec_name, "rt5639", 6))
				rt5639_headset_detect(codec, 0);
			else if (!strncmp(machine->pdata->codec_name, "rt5640",
									    6))
				rt5640_headset_detect(codec, 0);

			machine->jack_status &= ~SND_JACK_HEADPHONE;
			machine->jack_status &= ~SND_JACK_MICROPHONE;
		}
	}

	switch (machine->jack_status) {
	case SND_JACK_HEADPHONE:
		state = BIT_HEADSET_NO_MIC;
		break;
	case SND_JACK_HEADSET:
		state = BIT_HEADSET;
		break;
	case SND_JACK_MICROPHONE:
		/* mic: would not report */
	default:
		state = BIT_NO_HEADSET;
	}

	switch_set_state(&tegra_rt5640_headset_switch, state);

	return NOTIFY_OK;
}

static struct notifier_block tegra_rt5640_jack_detect_nb = {
	.notifier_call = tegra_rt5640_jack_notifier,
};
#else
static struct snd_soc_jack_pin tegra_rt5640_hp_jack_pins[] = {
	{
		.pin = "Headphone Jack",
		.mask = SND_JACK_HEADPHONE,
	},
};

#endif

static int tegra_rt5640_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_rt5640 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_rt5640_platform_data *pdata = machine->pdata;

	if (machine->spk_reg) {
		if (SND_SOC_DAPM_EVENT_ON(event))
			regulator_enable(machine->spk_reg);
		else
			regulator_disable(machine->spk_reg);
	}

	if (!(machine->gpio_requested & GPIO_SPKR_EN))
		return 0;

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

	return 0;
}

static int tegra_rt5640_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_rt5640 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_rt5640_platform_data *pdata = machine->pdata;

	if (!(machine->gpio_requested & GPIO_HP_MUTE))
		return 0;

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

	return 0;
}

static int tegra_rt5640_event_int_mic(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_rt5640 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_rt5640_platform_data *pdata = machine->pdata;

	if (machine->dmic_reg) {
		if (SND_SOC_DAPM_EVENT_ON(event))
			regulator_enable(machine->dmic_reg);
		else
			regulator_disable(machine->dmic_reg);
	}

	if (!(machine->gpio_requested & GPIO_INT_MIC_EN))
		return 0;

	gpio_set_value_cansleep(pdata->gpio_int_mic_en,
				SND_SOC_DAPM_EVENT_ON(event));

	return 0;
}

static int tegra_rt5640_event_ext_mic(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_rt5640 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_rt5640_platform_data *pdata = machine->pdata;

	if (!(machine->gpio_requested & GPIO_EXT_MIC_EN))
		return 0;

	gpio_set_value_cansleep(pdata->gpio_ext_mic_en,
				!SND_SOC_DAPM_EVENT_ON(event));

	return 0;
}

static const struct snd_soc_dapm_widget cardhu_dapm_widgets[] = {
	SND_SOC_DAPM_SPK("Int Spk", tegra_rt5640_event_int_spk),
	SND_SOC_DAPM_HP("Headphone Jack", tegra_rt5640_event_hp),
	SND_SOC_DAPM_MIC("Mic Jack", tegra_rt5640_event_ext_mic),
	SND_SOC_DAPM_MIC("Int Mic", tegra_rt5640_event_int_mic),
};

static const struct snd_soc_dapm_route cardhu_audio_map[] = {
	{"Headphone Jack", NULL, "HPOR"},
	{"Headphone Jack", NULL, "HPOL"},
	{"Int Spk", NULL, "SPORP"},
	{"Int Spk", NULL, "SPORN"},
	{"Int Spk", NULL, "SPOLP"},
	{"Int Spk", NULL, "SPOLN"},
	{"micbias1", NULL, "Mic Jack"},
	{"IN1P", NULL, "micbias1"},
	{"IN1N", NULL, "micbias1"},
	{"micbias1", NULL, "Int Mic"},
	{"IN2P", NULL, "micbias1"},
};

static const struct snd_kcontrol_new cardhu_controls[] = {
	SOC_DAPM_PIN_SWITCH("Int Spk"),
	SOC_DAPM_PIN_SWITCH("Headphone Jack"),
	SOC_DAPM_PIN_SWITCH("Mic Jack"),
	SOC_DAPM_PIN_SWITCH("Int Mic"),
};

static int tegra_rt5640_init(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_codec *codec = rtd->codec;
	struct snd_soc_dapm_context *dapm = &codec->dapm;
	struct snd_soc_card *card = codec->card;
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_rt5640_platform_data *pdata = machine->pdata;
	int ret;

	if (gpio_is_valid(pdata->gpio_spkr_en)) {
		ret = gpio_request(pdata->gpio_spkr_en, "spkr_en");
		if (ret) {
			dev_err(card->dev, "cannot get spkr_en gpio\n");
			return ret;
		}
		machine->gpio_requested |= GPIO_SPKR_EN;

		gpio_direction_output(pdata->gpio_spkr_en, 0);
	}

	if (gpio_is_valid(pdata->gpio_hp_mute)) {
		ret = gpio_request(pdata->gpio_hp_mute, "hp_mute");
		if (ret) {
			dev_err(card->dev, "cannot get hp_mute gpio\n");
			return ret;
		}
		machine->gpio_requested |= GPIO_HP_MUTE;

		gpio_direction_output(pdata->gpio_hp_mute, 0);
	}

	if (gpio_is_valid(pdata->gpio_int_mic_en)) {
		ret = gpio_request(pdata->gpio_int_mic_en, "int_mic_en");
		if (ret) {
			dev_err(card->dev, "cannot get int_mic_en gpio\n");
			return ret;
		}
		machine->gpio_requested |= GPIO_INT_MIC_EN;

		/* Disable int mic; enable signal is active-high */
		gpio_direction_output(pdata->gpio_int_mic_en, 0);
	}

	if (gpio_is_valid(pdata->gpio_ext_mic_en)) {
		ret = gpio_request(pdata->gpio_ext_mic_en, "ext_mic_en");
		if (ret) {
			dev_err(card->dev, "cannot get ext_mic_en gpio\n");
			return ret;
		}
		machine->gpio_requested |= GPIO_EXT_MIC_EN;

		/* Enable ext mic; enable signal is active-low */
		gpio_direction_output(pdata->gpio_ext_mic_en, 0);
	}

	if (gpio_is_valid(pdata->gpio_hp_det)) {
		tegra_rt5640_hp_jack_gpio.gpio = pdata->gpio_hp_det;
		snd_soc_jack_new(codec, "Headphone Jack", SND_JACK_HEADPHONE,
				&tegra_rt5640_hp_jack);
#ifndef CONFIG_SWITCH
		snd_soc_jack_add_pins(&tegra_rt5640_hp_jack,
					ARRAY_SIZE(tegra_rt5640_hp_jack_pins),
					tegra_rt5640_hp_jack_pins);
#else
		snd_soc_jack_notifier_register(&tegra_rt5640_hp_jack,
					&tegra_rt5640_jack_detect_nb);
#endif
		snd_soc_jack_add_gpios(&tegra_rt5640_hp_jack,
					1,
					&tegra_rt5640_hp_jack_gpio);
		machine->gpio_requested |= GPIO_HP_DET;
	}

	ret = snd_soc_add_controls(codec, cardhu_controls,
			ARRAY_SIZE(cardhu_controls));
	if (ret < 0)
		return ret;

	snd_soc_dapm_new_controls(dapm, cardhu_dapm_widgets,
			ARRAY_SIZE(cardhu_dapm_widgets));

	snd_soc_dapm_add_routes(dapm, cardhu_audio_map,
				ARRAY_SIZE(cardhu_audio_map));
	/* FIXME: Calculate automatically based on DAPM routes? */
	snd_soc_dapm_nc_pin(dapm, "LOUTL");
	snd_soc_dapm_nc_pin(dapm, "LOUTR");

	snd_soc_dapm_sync(dapm);

	return 0;
}

static struct snd_soc_dai_link tegra_rt5640_dai[] = {
	{
		.name = "RT5640",
		.stream_name = "RT5640 PCM",
		.codec_name = "rt5640.4-001c",
		.platform_name = "tegra-pcm-audio",
		.cpu_dai_name = "tegra30-i2s.1",
		.codec_dai_name = "rt5640-aif1",
		.init = tegra_rt5640_init,
		.ops = &tegra_rt5640_ops,
	},
	{
		.name = "SPDIF",
		.stream_name = "SPDIF PCM",
		.codec_name = "spdif-dit.0",
		.platform_name = "tegra-pcm-audio",
		.cpu_dai_name = "tegra30-spdif",
		.codec_dai_name = "dit-hifi",
		.ops = &tegra_spdif_ops,
	},
	{
		.name = "BT-SCO",
		.stream_name = "BT SCO PCM",
		.codec_name = "spdif-dit.1",
		.platform_name = "tegra-pcm-audio",
		.cpu_dai_name = "tegra30-i2s.3",
		.codec_dai_name = "dit-hifi",
		.ops = &tegra_rt5640_bt_sco_ops,
	},
};

static struct snd_soc_card snd_soc_tegra_rt5640 = {
	.name = "tegra-rt5640",
	.dai_link = tegra_rt5640_dai,
	.num_links = ARRAY_SIZE(tegra_rt5640_dai),
};

static __devinit int tegra_rt5640_driver_probe(struct platform_device *pdev)
{
	struct snd_soc_card *card = &snd_soc_tegra_rt5640;
	struct tegra_rt5640 *machine;
	struct tegra_rt5640_platform_data *pdata;
	int ret;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "No platform data supplied\n");
		return -EINVAL;
	}

	if (pdata->codec_name)
		card->dai_link->codec_name = pdata->codec_name;
	if (pdata->codec_dai_name)
		card->dai_link->codec_dai_name = pdata->codec_dai_name;

	machine = kzalloc(sizeof(struct tegra_rt5640), GFP_KERNEL);
	if (!machine) {
		dev_err(&pdev->dev, "Can't allocate tegra_rt5640 struct\n");
		return -ENOMEM;
	}

	machine->pdata = pdata;

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

	machine->cdc_en = regulator_get(NULL, "cdc_en");
	if (WARN_ON(IS_ERR(machine->cdc_en))) {
		dev_err(&pdev->dev, "Couldn't get regulator cdc_en: %ld\n",
						PTR_ERR(machine->cdc_en));
		machine->cdc_en = 0;
	} else {
		regulator_enable(machine->cdc_en);
	}

	machine->spk_reg = regulator_get(&pdev->dev, "vdd_spk_amp");
	if (IS_ERR(machine->spk_reg)) {
		dev_info(&pdev->dev, "No speaker regulator found\n");
		machine->spk_reg = 0;
	}

#ifdef CONFIG_SWITCH
	/* Addd h2w swith class support */
	ret = switch_dev_register(&tegra_rt5640_headset_switch);
	if (ret < 0)
		goto err_fini_utils;
#endif

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

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

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

	return 0;

err_unregister_card:
	snd_soc_unregister_card(card);
err_unregister_switch:
#ifdef CONFIG_SWITCH
	switch_dev_unregister(&tegra_rt5640_headset_switch);
err_fini_utils:
#endif
	tegra_asoc_utils_fini(&machine->util_data);
err_free_machine:
	kfree(machine);
	return ret;
}

static int __devexit tegra_rt5640_driver_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct tegra_rt5640 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_rt5640_platform_data *pdata = machine->pdata;

	if (machine->gpio_requested & GPIO_HP_DET)
		snd_soc_jack_free_gpios(&tegra_rt5640_hp_jack,
					1,
					&tegra_rt5640_hp_jack_gpio);
	if (machine->gpio_requested & GPIO_EXT_MIC_EN)
		gpio_free(pdata->gpio_ext_mic_en);
	if (machine->gpio_requested & GPIO_INT_MIC_EN)
		gpio_free(pdata->gpio_int_mic_en);
	if (machine->gpio_requested & GPIO_HP_MUTE)
		gpio_free(pdata->gpio_hp_mute);
	if (machine->gpio_requested & GPIO_SPKR_EN)
		gpio_free(pdata->gpio_spkr_en);
	machine->gpio_requested = 0;

	if (machine->spk_reg)
		regulator_put(machine->spk_reg);
	if (machine->dmic_reg)
		regulator_put(machine->dmic_reg);

	if (machine->cdc_en) {
		regulator_disable(machine->cdc_en);
		regulator_put(machine->cdc_en);
	}

	snd_soc_unregister_card(card);

	tegra_asoc_utils_fini(&machine->util_data);

#ifdef CONFIG_SWITCH
	switch_dev_unregister(&tegra_rt5640_headset_switch);
#endif
	kfree(machine);

	return 0;
}

static struct platform_driver tegra_rt5640_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
		.pm = &snd_soc_pm_ops,
	},
	.probe = tegra_rt5640_driver_probe,
	.remove = __devexit_p(tegra_rt5640_driver_remove),
};

static int __init tegra_rt5640_modinit(void)
{
	return platform_driver_register(&tegra_rt5640_driver);
}
module_init(tegra_rt5640_modinit);

static void __exit tegra_rt5640_modexit(void)
{
	platform_driver_unregister(&tegra_rt5640_driver);
}
module_exit(tegra_rt5640_modexit);

MODULE_AUTHOR("Johnny Qiu <joqiu@nvidia.com>");
MODULE_DESCRIPTION("Tegra+RT5640 machine ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);