path: root/sound/soc/tegra/tegra_max98095.c

/*
 * tegra_max98095.c - Tegra machine ASoC driver for boards using MAX98095 codec.
 *
 * Author: Ravindra Lokhande <rlokhande@nvidia.com>
 * Copyright (C) 2012 - NVIDIA, Inc.
 *
 * Based on version from Sumit Bhattacharya <sumitb@nvidia.com>
 *
 * Based on code copyright/by:
 *
 * (c) 2010, 2011, 2012 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 <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_asoc_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/max98095.h"

#include "tegra_pcm.h"
#include "tegra_asoc_utils.h"
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
#include "tegra30_ahub.h"
#include "tegra30_i2s.h"
#include "tegra30_dam.h"
#endif

#define DRV_NAME "tegra-snd-max98095"

#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)

#ifndef CONFIG_ARCH_TEGRA_2x_SOC
const char *tegra_max98095_i2s_dai_name[TEGRA30_NR_I2S_IFC] = {
	"tegra30-i2s.0",
	"tegra30-i2s.1",
	"tegra30-i2s.2",
	"tegra30-i2s.3",
	"tegra30-i2s.4",
};
#endif

struct tegra_max98095 {
	struct tegra_asoc_utils_data util_data;
	struct tegra_asoc_platform_data *pdata;
	int gpio_requested;
	bool init_done;
	int is_call_mode;
	int is_device_bt;
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	struct codec_config codec_info[NUM_I2S_DEVICES];
#endif
	enum snd_soc_bias_level bias_level;
};


#ifndef CONFIG_ARCH_TEGRA_2x_SOC
static int tegra_max98095_set_dam_cif(int dam_ifc, int srate,
			int channels, int bit_size)
{
	tegra30_dam_set_samplerate(dam_ifc, TEGRA30_DAM_CHOUT,
				srate);
	tegra30_dam_set_samplerate(dam_ifc, TEGRA30_DAM_CHIN1,
				srate);
	tegra30_dam_set_acif(dam_ifc, TEGRA30_DAM_CHIN1,
		channels, bit_size, channels,
				bit_size);
	tegra30_dam_set_acif(dam_ifc, TEGRA30_DAM_CHOUT,
		channels, bit_size, channels,
				bit_size);

	return 0;
}
#endif

static int tegra_max98095_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_max98095 *machine = snd_soc_card_get_drvdata(card);
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(cpu_dai);
#endif
	unsigned int srate, mclk, sample_size;
	int err;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		sample_size = 16;
		break;
	default:
		return -EINVAL;
	}

	srate = params_rate(params);
	switch (srate) {
	case 8000:
	case 16000:
	case 24000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		mclk = 12288000;
		break;
	case 11025:
	case 22050:
	case 44100:
	case 88200:
		mclk = 11289600;
		break;
	default:
		mclk = 12000000;
		break;
	}

	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);

	err = snd_soc_dai_set_fmt(codec_dai,
					SND_SOC_DAIFMT_I2S |
					SND_SOC_DAIFMT_NB_NF |
					SND_SOC_DAIFMT_CBS_CFS);
	if (err < 0) {
		dev_err(card->dev, "codec_dai fmt not set\n");
		return err;
	}

	err = snd_soc_dai_set_fmt(cpu_dai,
					SND_SOC_DAIFMT_I2S |
					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;
	}

	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;
	}

#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		tegra_max98095_set_dam_cif(i2s->dam_ifc, srate,
				params_channels(params), sample_size);
#endif

	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_max98095 *machine = snd_soc_card_get_drvdata(card);
	unsigned 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_max98095 *machine = snd_soc_card_get_drvdata(rtd->card);

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 0);

	return 0;
}

#ifndef CONFIG_ARCH_TEGRA_2x_SOC
static int tegra_max98095_startup(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(cpu_dai);

	if ((substream->stream != SNDRV_PCM_STREAM_PLAYBACK) ||
		!(i2s->is_dam_used))
		return 0;

	/*dam configuration*/
	if (!i2s->dam_ch_refcount)
		i2s->dam_ifc = tegra30_dam_allocate_controller();

	tegra30_dam_allocate_channel(i2s->dam_ifc, TEGRA30_DAM_CHIN1);
	i2s->dam_ch_refcount++;
	tegra30_dam_enable_clock(i2s->dam_ifc);
	tegra30_dam_set_gain(i2s->dam_ifc, TEGRA30_DAM_CHIN1, 0x1000);

	tegra30_ahub_set_rx_cif_source(TEGRA30_AHUB_RXCIF_DAM0_RX1 +
			(i2s->dam_ifc*2), i2s->txcif);

	/*
	*make the dam tx to i2s rx connection if this is the only client
	*using i2s for playback
	*/
	if (i2s->playback_ref_count == 1)
		tegra30_ahub_set_rx_cif_source(
			TEGRA30_AHUB_RXCIF_I2S0_RX0 + i2s->id,
			TEGRA30_AHUB_TXCIF_DAM0_TX0 + i2s->dam_ifc);

	/* enable the dam*/
	tegra30_dam_enable(i2s->dam_ifc, TEGRA30_DAM_ENABLE,
			TEGRA30_DAM_CHIN1);

	return 0;
}

static void tegra_max98095_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(cpu_dai);

	if ((substream->stream != SNDRV_PCM_STREAM_PLAYBACK) ||
		!(i2s->is_dam_used))
		return;

	/* disable the dam*/
	tegra30_dam_enable(i2s->dam_ifc, TEGRA30_DAM_DISABLE,
			TEGRA30_DAM_CHIN1);

	/* disconnect the ahub connections*/
	tegra30_ahub_unset_rx_cif_source(TEGRA30_AHUB_RXCIF_DAM0_RX1 +
				(i2s->dam_ifc*2));

	/* disable the dam and free the controller */
	tegra30_dam_disable_clock(i2s->dam_ifc);
	tegra30_dam_free_channel(i2s->dam_ifc, TEGRA30_DAM_CHIN1);
	i2s->dam_ch_refcount--;
	if (!i2s->dam_ch_refcount)
		tegra30_dam_free_controller(i2s->dam_ifc);

	return;
}
#endif

static struct snd_soc_ops tegra_max98095_ops = {
	.hw_params = tegra_max98095_hw_params,
	.hw_free = tegra_hw_free,
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	.startup = tegra_max98095_startup,
	.shutdown = tegra_max98095_shutdown,
#endif
};

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_max98095_hp_jack;

#ifdef CONFIG_SWITCH
static struct switch_dev wired_switch_dev = {
	.name = "h2w",
};

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

static int headset_switch_notify(struct notifier_block *self,
	unsigned long action, void *dev)
{
	int state = 0;

	switch (action) {
	case SND_JACK_HEADPHONE:
		state |= BIT_HEADSET_NO_MIC;
		break;
	case SND_JACK_HEADSET:
		state |= BIT_HEADSET;
		break;
	default:
		state |= BIT_NO_HEADSET;
	}

	switch_set_state(&wired_switch_dev, state);

	return NOTIFY_OK;
}

static struct notifier_block headset_switch_nb = {
	.notifier_call = headset_switch_notify,
};
#else
static struct snd_soc_jack_pin tegra_max98095_hp_jack_pins[] = {
	{
		.pin = "Headphone Jack",
		.mask = SND_JACK_HEADPHONE,
	},
};
#endif

static int tegra_max98095_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_max98095 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_asoc_platform_data *pdata = machine->pdata;

	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_max98095_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_max98095 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_asoc_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 const struct snd_soc_dapm_widget tegra_max98095_dapm_widgets[] = {
	SND_SOC_DAPM_SPK("Int Spk", tegra_max98095_event_int_spk),
	SND_SOC_DAPM_HP("Headphone Jack", tegra_max98095_event_hp),
	SND_SOC_DAPM_MIC("Mic Jack", NULL),
	SND_SOC_DAPM_INPUT("Int Mic"),
	SND_SOC_DAPM_LINE("Line In", NULL),
};

static const struct snd_soc_dapm_route enterprise_audio_map[] = {
	{"Int Spk", NULL, "SPKL"},
	{"Int Spk", NULL, "SPKR"},
	{"Headphone Jack", NULL, "HPL"},
	{"Headphone Jack", NULL, "HPR"},
	{"MICBIAS2", NULL, "Mic Jack"},
	{"MIC2", NULL, "MICBIAS2"},
	{"MIC1", NULL, "Int Mic"},
	{"MIC1", NULL, "MICBIAS1"},
	{"INB1", NULL, "Line In"},
	{"INB2", NULL, "Line In"},
};

static const struct snd_kcontrol_new tegra_max98095_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"),
	SOC_DAPM_PIN_SWITCH("LineIn"),
};

static int tegra_max98095_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_max98095 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_asoc_platform_data *pdata = machine->pdata;
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(rtd->cpu_dai);
#endif
	int ret;

#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	if (machine->codec_info[BASEBAND].i2s_id != -1)
		i2s->is_dam_used = true;
#endif

	if (machine->init_done)
		return 0;

	machine->init_done = true;

	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);
	}

	ret = snd_soc_add_controls(codec, tegra_max98095_controls,
				   ARRAY_SIZE(tegra_max98095_controls));
	if (ret < 0)
		return ret;

	snd_soc_dapm_new_controls(dapm, tegra_max98095_dapm_widgets,
			ARRAY_SIZE(tegra_max98095_dapm_widgets));

	snd_soc_dapm_add_routes(dapm, enterprise_audio_map,
			ARRAY_SIZE(enterprise_audio_map));

	ret = snd_soc_jack_new(codec, "Headset Jack", SND_JACK_HEADSET,
			&tegra_max98095_hp_jack);
	if (ret < 0)
		return ret;

#ifdef CONFIG_SWITCH
	snd_soc_jack_notifier_register(&tegra_max98095_hp_jack,
		&headset_switch_nb);
#else /*gpio based headset detection*/
	snd_soc_jack_add_pins(&tegra_max98095_hp_jack,
		ARRAY_SIZE(tegra_max98095_hp_jack_pins),
		tegra_max98095_hp_jack_pins);
#endif

	ret = tegra_asoc_utils_register_ctls(&machine->util_data);
	if (ret < 0)
		return ret;

	/* max98095_headset_detect(codec, &tegra_max98095_hp_jack,
		SND_JACK_HEADSET); */

	snd_soc_dapm_nc_pin(dapm, "INA1");
	snd_soc_dapm_nc_pin(dapm, "INA2");
	snd_soc_dapm_nc_pin(dapm, "INB1");
	snd_soc_dapm_nc_pin(dapm, "INB2");
	snd_soc_dapm_sync(dapm);

	return 0;
}

static struct snd_soc_dai_link tegra_max98095_dai[] = {
	{
		.name = "MAX98095",
		.stream_name = "MAX98095 HIFI",
		.codec_name = "max98095.4-0010",
		.platform_name = "tegra-pcm-audio",
		.cpu_dai_name = "tegra30-i2s.1",
		.codec_dai_name = "HiFi",
		.init = tegra_max98095_init,
		.ops = &tegra_max98095_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,
	},
};

static int tegra30_soc_set_bias_level(struct snd_soc_card *card,
					enum snd_soc_bias_level level)
{
	struct tegra_max98095 *machine = snd_soc_card_get_drvdata(card);

	if (machine->bias_level == SND_SOC_BIAS_OFF &&
		level != SND_SOC_BIAS_OFF)
		tegra_asoc_utils_clk_enable(&machine->util_data);

	machine->bias_level = level;

	return 0;
}

static int tegra30_soc_set_bias_level_post(struct snd_soc_card *card,
					enum snd_soc_bias_level level)
{
	struct tegra_max98095 *machine = snd_soc_card_get_drvdata(card);

	if (level == SND_SOC_BIAS_OFF)
		tegra_asoc_utils_clk_disable(&machine->util_data);

	return 0 ;
}

static struct snd_soc_card snd_soc_tegra_max98095 = {
	.name = "tegra-max98095",
	.dai_link = tegra_max98095_dai,
	.num_links = ARRAY_SIZE(tegra_max98095_dai),
	.set_bias_level = tegra30_soc_set_bias_level,
	.set_bias_level_post = tegra30_soc_set_bias_level_post,
};

static __devinit int tegra_max98095_driver_probe(struct platform_device *pdev)
{
	struct snd_soc_card *card = &snd_soc_tegra_max98095;
	struct tegra_max98095 *machine;
	struct tegra_asoc_platform_data *pdata;
	int ret;

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

	machine = kzalloc(sizeof(struct tegra_max98095), GFP_KERNEL);
	if (!machine) {
		dev_err(&pdev->dev, "Can't allocate tegra_max98095 struct\n");
		return -ENOMEM;
	}

	machine->pdata = pdata;

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

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

#ifdef CONFIG_SWITCH
	/* Add h2w switch class support */
	ret = switch_dev_register(&wired_switch_dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "not able to register switch device\n");
		goto err_fini_utils;
	}
#endif

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

	return 0;

err_switch_unregister:
#ifdef CONFIG_SWITCH
	switch_dev_unregister(&wired_switch_dev);
#endif
err_fini_utils:
	tegra_asoc_utils_fini(&machine->util_data);
err_free_machine:
	kfree(machine);
	return ret;
}

static int __devexit tegra_max98095_driver_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct tegra_max98095 *machine = snd_soc_card_get_drvdata(card);
	struct tegra_asoc_platform_data *pdata = machine->pdata;

	snd_soc_unregister_card(card);

#ifdef CONFIG_SWITCH
	switch_dev_unregister(&wired_switch_dev);
#endif

	tegra_asoc_utils_fini(&machine->util_data);

	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);

	kfree(machine);

	return 0;
}

static struct platform_driver tegra_max98095_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
		.pm = &snd_soc_pm_ops,
	},
	.probe = tegra_max98095_driver_probe,
	.remove = __devexit_p(tegra_max98095_driver_remove),
};

static int __init tegra_max98095_modinit(void)
{
	return platform_driver_register(&tegra_max98095_driver);
}
module_init(tegra_max98095_modinit);

static void __exit tegra_max98095_modexit(void)
{
	platform_driver_unregister(&tegra_max98095_driver);
}
module_exit(tegra_max98095_modexit);

MODULE_AUTHOR("Ravindra Lokhande <rlokhande@nvidia.com>");
MODULE_DESCRIPTION("Tegra+MAX98095 machine ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);