sound/soc/fsl/imx-wm8960.c

/*
 * Copyright (C) 2015 Freescale Semiconductor, Inc.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/i2c.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <sound/soc.h>
#include <sound/jack.h>
#include <sound/control.h>
#include <sound/pcm_params.h>
#include <sound/soc-dapm.h>
#include <linux/pinctrl/consumer.h>
#include <linux/mfd/syscon.h>
#include "../codecs/wm8960.h"
#include "fsl_sai.h"

#define DAI_NAME_SIZE	32

struct imx_wm8960_data {
	struct snd_soc_card card;
	char codec_dai_name[DAI_NAME_SIZE];
	char platform_name[DAI_NAME_SIZE];
	struct clk *codec_clk;
	unsigned int clk_frequency;
	bool is_codec_master;
	bool is_stream_in_use[2];
	bool is_stream_opened[2];
	struct regmap *gpr;
	unsigned int hp_det[2];
	u32 asrc_rate;
	u32 asrc_format;
};

struct imx_priv {
	int hp_set_gpio;
	int hp_active_low;
	struct snd_kcontrol *headset_kctl;
	struct snd_soc_codec *codec;
	struct platform_device *pdev;
	struct platform_device *asrc_pdev;
	struct snd_card *snd_card;
};

static struct imx_priv card_priv;

static struct snd_soc_jack imx_hp_set;
static struct snd_soc_jack_pin imx_hp_set_pins[] = {
	{
		.pin = "Headset Jack",
		.mask = SND_JACK_HEADSET,
	},
};
static struct snd_soc_jack_gpio imx_hp_set_gpio = {
	.name = "headset detect",
	.report = SND_JACK_HEADSET,
	.debounce_time = 250,
	.invert = 1,
};

static int hp_set_status_check(void)
{
	struct imx_priv *priv = &card_priv;
	struct platform_device *pdev = priv->pdev;
	char *envp[3], *buf;
	int hp_status, ret;

	if (!gpio_is_valid(priv->hp_set_gpio))
		return 0;

	hp_status = gpio_get_value(priv->hp_set_gpio) ? 1 : 0;
	buf = kmalloc(32, GFP_ATOMIC);
	if (!buf) {
		dev_err(&pdev->dev, "%s kmalloc failed\n", __func__);
		return -ENOMEM;
	}

	if (hp_status != priv->hp_active_low) {
		snprintf(buf, 32, "STATE=%d", 2);
		snd_soc_dapm_disable_pin(&priv->codec->dapm, "Ext Spk");
		snd_soc_dapm_disable_pin(&priv->codec->dapm, "Main MIC");
		ret = imx_hp_set_gpio.report;

		/*
		 *  As the hp MIC only connect the input for left channel, we
		 *  need to route it for right channel.
		 */
		snd_soc_update_bits(priv->codec, WM8960_ADDCTL1, 3<<2, 1<<2);

		snd_kctl_jack_report(priv->snd_card, priv->headset_kctl, 1);
	} else {
		snprintf(buf, 32, "STATE=%d", 0);
		snd_soc_dapm_enable_pin(&priv->codec->dapm, "Ext Spk");
		snd_soc_dapm_enable_pin(&priv->codec->dapm, "Main MIC");
		ret = 0;

		/*
		 *  As the Main MIC only connect the input for right channel,
		 *  we need to route it for left channel.
		 */
		snd_soc_update_bits(priv->codec, WM8960_ADDCTL1, 3<<2, 2<<2);

		snd_kctl_jack_report(priv->snd_card, priv->headset_kctl, 0);
	}

	envp[0] = "NAME=headset";
	envp[1] = buf;
	envp[2] = NULL;
	kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
	kfree(buf);

	return ret;
}

static const struct snd_soc_dapm_widget imx_wm8960_dapm_widgets[] = {
	SND_SOC_DAPM_HP("Headset Jack", NULL),
	SND_SOC_DAPM_SPK("Ext Spk", NULL),
	SND_SOC_DAPM_MIC("Hp MIC", NULL),
	SND_SOC_DAPM_MIC("Main MIC", NULL),
};

static int imx_wm8960_gpio_init(struct snd_soc_card *card)
{
	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
	struct snd_soc_codec *codec = codec_dai->codec;
	struct imx_priv *priv = &card_priv;
	int ret;
	priv->codec = codec;

	if (gpio_is_valid(priv->hp_set_gpio)) {
		imx_hp_set_gpio.gpio = priv->hp_set_gpio;
		imx_hp_set_gpio.jack_status_check = hp_set_status_check;

		ret = snd_soc_jack_new(codec, "Headset Jack",
				SND_JACK_HEADSET, &imx_hp_set);
		if (ret)
			return ret;
		ret = snd_soc_jack_add_pins(&imx_hp_set,
			ARRAY_SIZE(imx_hp_set_pins), imx_hp_set_pins);
		if (ret)
			return ret;
		ret = snd_soc_jack_add_gpios(&imx_hp_set, 1,
						&imx_hp_set_gpio);
		if (ret)
			return ret;
	}

	return 0;
}

static ssize_t show_headphone(struct device_driver *dev, char *buf)
{
	struct imx_priv *priv = &card_priv;
	int hp_status;

	if (!gpio_is_valid(priv->hp_set_gpio)) {
		strcpy(buf, "no detect gpio connected\n");
		return strlen(buf);
	}

	/* Check if headphone is plugged in */
	hp_status = gpio_get_value(priv->hp_set_gpio) ? 1 : 0;

	if (hp_status != priv->hp_active_low)
		strcpy(buf, "Headphone\n");
	else
		strcpy(buf, "Speaker\n");

	return strlen(buf);
}

static ssize_t show_micphone(struct device_driver *dev, char *buf)
{
	struct imx_priv *priv = &card_priv;
	int hp_status;

	if (!gpio_is_valid(priv->hp_set_gpio)) {
		strcpy(buf, "no detect gpio connected\n");
		return strlen(buf);
	}

	/* Check if headphone is plugged in */
	hp_status = gpio_get_value(priv->hp_set_gpio) ? 1 : 0;

	if (hp_status != priv->hp_active_low)
		strcpy(buf, "Hp MIC\n");
	else
		strcpy(buf, "Main MIC\n");

	return strlen(buf);
}
static DRIVER_ATTR(headphone, S_IRUGO | S_IWUSR, show_headphone, NULL);
static DRIVER_ATTR(micphone, S_IRUGO | S_IWUSR, show_micphone, NULL);

static void wm8960_init(struct snd_soc_dai *codec_dai)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct snd_soc_card *card = codec_dai->card;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);

	/*
	 * codec ADCLRC pin configured as GPIO, DACLRC pin is used as a frame
	 * clock for ADCs and DACs
	 */
	snd_soc_update_bits(codec, WM8960_IFACE2, 1<<6, 1<<6);

	/*
	 * GPIO1 used as headphone detect output
	 */
	snd_soc_update_bits(codec, WM8960_ADDCTL4, 7<<4, 3<<4);

	/*
	 * Enable headphone jack detect
	 */
	snd_soc_update_bits(codec, WM8960_ADDCTL2, 1<<6, 1<<6);
	snd_soc_update_bits(codec, WM8960_ADDCTL2, 1<<5, data->hp_det[1]<<5);
	snd_soc_update_bits(codec, WM8960_ADDCTL4, 3<<2, data->hp_det[0]<<2);
	snd_soc_update_bits(codec, WM8960_ADDCTL1, 3, 3);

	/*
	 * route left channel to right channel in default.
	 */
	snd_soc_update_bits(codec, WM8960_ADDCTL1, 3<<2, 1<<2);
}

/* -1 for reserved value */
static const int sysclk_divs[] = { 1, -1, 2, -1 };

/* Multiply 256 for internal 256 div */
static const int dac_divs[] = { 256, 384, 512, 768, 1024, 1408, 1536 };

/* Multiply 10 to eliminate decimials */
static const int bclk_divs[] = {
	10, 15, 20, 30, 40, 55, 60, 80, 110,
	120, 160, 220, 240, 320, 320, 320
};

static int imx_hifi_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_card *card = codec_dai->codec->card;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct device *dev = card->dev;
	unsigned int sample_rate = params_rate(params);
	unsigned int sysclk, pll_out;
	int i, j, k, ret = 0;
	int bclk = snd_soc_params_to_bclk(params);
	unsigned int fmt;

	if (params_channels(params) == 1)
		bclk *= 2;

	data->is_stream_in_use[tx] = true;

	if (data->is_stream_in_use[!tx])
		return 0;

	if (data->is_codec_master)
		fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
			SND_SOC_DAIFMT_CBM_CFM;
	else
		fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
			SND_SOC_DAIFMT_CBS_CFS;

	/* set cpu DAI configuration */
	ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
	if (ret) {
		dev_err(dev, "failed to set cpu dai fmt: %d\n", ret);
		return ret;
	}
	/* set codec DAI configuration */
	ret = snd_soc_dai_set_fmt(codec_dai, fmt);
	if (ret) {
		dev_err(dev, "failed to set codec dai fmt: %d\n", ret);
		return ret;
	}

	if (!data->is_codec_master) {
		ret = snd_soc_dai_set_tdm_slot(cpu_dai, 0, 0, 2, params_width(params));
		if (ret) {
			dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
			return ret;
		}

		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, 0, SND_SOC_CLOCK_OUT);
		if (ret) {
			dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
			return ret;
		}
		return 0;
	} else {
		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, 0, SND_SOC_CLOCK_IN);
		if (ret) {
			dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
			return ret;
		}
	}

	data->clk_frequency = clk_get_rate(data->codec_clk);

	/* Use MCLK to provide sysclk directly*/
	sysclk = data->clk_frequency;

	for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
		if (sysclk_divs[i] == -1)
			continue;
		sysclk /= sysclk_divs[i];
		for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) {
			if (sysclk == sample_rate * dac_divs[j]) {
				for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k)
					if (sysclk == bclk * bclk_divs[k] / 10) {
						snd_soc_dai_set_sysclk(codec_dai, WM8960_SYSCLK_MCLK, sysclk, 0);
						snd_soc_dai_set_clkdiv(codec_dai, WM8960_SYSCLKDIV, i << 1);
						return 0;
					}
			}
		}
	}

	/* Use PLL to provide sysclk */
	for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
		if (sysclk_divs[i] == -1)
			continue;
		for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) {
			sysclk = sample_rate * dac_divs[j];
			pll_out = sysclk * sysclk_divs[i];

			for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) {
				if (sysclk == bclk * bclk_divs[k] / 10) {
					/* Set codec pll */
					ret = snd_soc_dai_set_pll(codec_dai, 0, 0, data->clk_frequency, pll_out);
					if (ret != 0)
						continue;
					/* Set codec sysclk */
					snd_soc_dai_set_sysclk(codec_dai, WM8960_SYSCLK_PLL, sysclk, 0);
					snd_soc_dai_set_clkdiv(codec_dai, WM8960_SYSCLKDIV, i << 1);
					return 0;
				}
			}
		}
	}

	dev_err(dev, "failed to configure system clock");
	return -EINVAL;
}

static int imx_hifi_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_card *card = codec_dai->codec->card;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;

	data->is_stream_in_use[tx] = false;

	/* Power down PLL to save power*/
	if (data->is_codec_master && !data->is_stream_in_use[!tx]) {
		snd_soc_dai_set_pll(codec_dai, 0, 0, 0, 0);
		snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_CBS_CFS | SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF);
	}

	return 0;
}

static u32 imx_wm8960_rates[] = { 8000, 16000, 32000, 48000 };
static struct snd_pcm_hw_constraint_list imx_wm8960_rate_constraints = {
	.count = ARRAY_SIZE(imx_wm8960_rates),
	.list = imx_wm8960_rates,
};

static int imx_hifi_startup(struct snd_pcm_substream *substream)
{
	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_card *card = codec_dai->codec->card;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
	int ret = 0;

	data->is_stream_opened[tx] = true;
	if (data->is_stream_opened[tx] != sai->is_stream_opened[tx] ||
	    data->is_stream_opened[!tx] != sai->is_stream_opened[!tx]) {
		data->is_stream_opened[tx] = false;
		return -EBUSY;
	}

	if (!data->is_codec_master) {
		ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
				SNDRV_PCM_HW_PARAM_RATE, &imx_wm8960_rate_constraints);
		if (ret)
			return ret;
	}

	ret = clk_prepare_enable(data->codec_clk);
	if (ret) {
		dev_err(card->dev, "Failed to enable MCLK: %d\n", ret);
		return ret;
	}

	return ret;
}

static void imx_hifi_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_card *card = codec_dai->codec->card;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;

	clk_disable_unprepare(data->codec_clk);

	data->is_stream_opened[tx] = false;
}

static struct snd_soc_ops imx_hifi_ops = {
	.hw_params = imx_hifi_hw_params,
	.hw_free = imx_hifi_hw_free,
	.startup   = imx_hifi_startup,
	.shutdown  = imx_hifi_shutdown,
};

static int imx_wm8960_late_probe(struct snd_soc_card *card)
{
	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);

	/*
	 * set SAI2_MCLK_DIR to enable codec MCLK
	 */
	if (data->gpr)
		regmap_update_bits(data->gpr, 4, 1<<20, 1<<20);

	wm8960_init(codec_dai);
	return 0;
}

static int be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
			struct snd_pcm_hw_params *params)
{
	struct snd_soc_card *card = rtd->card;
	struct imx_wm8960_data *data = snd_soc_card_get_drvdata(card);
	struct imx_priv *priv = &card_priv;
	struct snd_interval *rate;
	struct snd_mask *mask;

	if (!priv->asrc_pdev)
		return -EINVAL;

	rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	rate->max = rate->min = data->asrc_rate;

	mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	snd_mask_none(mask);
	snd_mask_set(mask, data->asrc_format);

	return 0;
}

static struct snd_soc_dai_link imx_wm8960_dai[] = {
	{
		.name = "HiFi",
		.stream_name = "HiFi",
		.codec_dai_name = "wm8960-hifi",
		.ops = &imx_hifi_ops,
	},
	{
		.name = "HiFi-ASRC-FE",
		.stream_name = "HiFi-ASRC-FE",
		.codec_name = "snd-soc-dummy",
		.codec_dai_name = "snd-soc-dummy-dai",
		.dynamic = 1,
		.ignore_pmdown_time = 1,
		.dpcm_playback = 1,
		.dpcm_capture = 1,
	},
	{
		.name = "HiFi-ASRC-BE",
		.stream_name = "HiFi-ASRC-BE",
		.codec_dai_name = "wm8960-hifi",
		.platform_name = "snd-soc-dummy",
		.no_pcm = 1,
		.ignore_pmdown_time = 1,
		.dpcm_playback = 1,
		.dpcm_capture = 1,
		.ops = &imx_hifi_ops,
		.be_hw_params_fixup = be_hw_params_fixup,
	},
};

static int imx_wm8960_probe(struct platform_device *pdev)
{
	struct device_node *cpu_np, *codec_np, *gpr_np;
	struct platform_device *cpu_pdev;
	struct imx_priv *priv = &card_priv;
	struct i2c_client *codec_dev;
	struct imx_wm8960_data *data;
	struct platform_device *asrc_pdev = NULL;
	struct device_node *asrc_np;
	u32 width;
	int ret;

	priv->pdev = pdev;

	cpu_np = of_parse_phandle(pdev->dev.of_node, "cpu-dai", 0);
	if (!cpu_np) {
		dev_err(&pdev->dev, "cpu dai phandle missing or invalid\n");
		ret = -EINVAL;
		goto fail;
	}

	codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
	if (!codec_np) {
		dev_err(&pdev->dev, "phandle missing or invalid\n");
		ret = -EINVAL;
		goto fail;
	}

	cpu_pdev = of_find_device_by_node(cpu_np);
	if (!cpu_pdev) {
		dev_err(&pdev->dev, "failed to find SAI platform device\n");
		ret = -EINVAL;
		goto fail;
	}

	codec_dev = of_find_i2c_device_by_node(codec_np);
	if (!codec_dev || !codec_dev->dev.driver) {
		dev_err(&pdev->dev, "failed to find codec platform device\n");
		ret = -EINVAL;
		goto fail;
	}

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
		ret = -ENOMEM;
		goto fail;
	}

	if (of_property_read_bool(pdev->dev.of_node, "codec-master"))
		data->is_codec_master = true;

	data->codec_clk = devm_clk_get(&codec_dev->dev, "mclk");
	if (IS_ERR(data->codec_clk)) {
		ret = PTR_ERR(data->codec_clk);
		dev_err(&pdev->dev, "failed to get codec clk: %d\n", ret);
		goto fail;
	}

	gpr_np = of_parse_phandle(pdev->dev.of_node, "gpr", 0);
        if (gpr_np) {
		data->gpr = syscon_node_to_regmap(gpr_np);
		if (IS_ERR(data->gpr)) {
			ret = PTR_ERR(data->gpr);
			dev_err(&pdev->dev, "failed to get gpr regmap\n");
			goto fail;
		}
	}

	of_property_read_u32_array(pdev->dev.of_node, "hp-det", data->hp_det, 2);

	asrc_np = of_parse_phandle(pdev->dev.of_node, "asrc-controller", 0);
	if (asrc_np) {
		asrc_pdev = of_find_device_by_node(asrc_np);
		priv->asrc_pdev = asrc_pdev;
	}

	data->card.dai_link = imx_wm8960_dai;

	imx_wm8960_dai[0].codec_of_node	= codec_np;
	imx_wm8960_dai[0].cpu_dai_name = dev_name(&cpu_pdev->dev);
	imx_wm8960_dai[0].platform_of_node = cpu_np;

	if (!asrc_pdev) {
		data->card.num_links = 1;
	} else {
		imx_wm8960_dai[1].cpu_of_node = asrc_np;
		imx_wm8960_dai[1].platform_of_node = asrc_np;
		imx_wm8960_dai[2].codec_of_node	= codec_np;
		imx_wm8960_dai[2].cpu_dai_name = dev_name(&cpu_pdev->dev);
		data->card.num_links = 3;

		ret = of_property_read_u32(asrc_np, "fsl,asrc-rate",
				&data->asrc_rate);
		if (ret) {
			dev_err(&pdev->dev, "failed to get output rate\n");
			ret = -EINVAL;
			goto fail;
		}

		ret = of_property_read_u32(asrc_np, "fsl,asrc-width", &width);
		if (ret) {
			dev_err(&pdev->dev, "failed to get output rate\n");
			ret = -EINVAL;
			goto fail;
		}

		if (width == 24)
			data->asrc_format = SNDRV_PCM_FORMAT_S24_LE;
		else
			data->asrc_format = SNDRV_PCM_FORMAT_S16_LE;
	}

	data->card.dev = &pdev->dev;
	ret = snd_soc_of_parse_card_name(&data->card, "model");
	if (ret)
		goto fail;
	data->card.dapm_widgets = imx_wm8960_dapm_widgets;
	data->card.num_dapm_widgets = ARRAY_SIZE(imx_wm8960_dapm_widgets);

	ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
	if (ret)
		goto fail;

	data->card.late_probe = imx_wm8960_late_probe;

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

	priv->snd_card = data->card.snd_card;

	priv->hp_set_gpio = of_get_named_gpio_flags(pdev->dev.of_node, "hp-det-gpios", 0,
			(enum of_gpio_flags *)&priv->hp_active_low);
	if (IS_ERR(ERR_PTR(priv->hp_set_gpio)))
		goto fail;

	priv->headset_kctl = snd_kctl_jack_new("Headset", 0, NULL);
	ret = snd_ctl_add(data->card.snd_card, priv->headset_kctl);
	if (ret)
		goto fail;

	ret = imx_wm8960_gpio_init(&data->card);

	if (gpio_is_valid(priv->hp_set_gpio)) {
		ret = driver_create_file(pdev->dev.driver, &driver_attr_headphone);
		if (ret) {
			dev_err(&pdev->dev, "create hp attr failed (%d)\n", ret);
			goto fail;
		}
		ret = driver_create_file(pdev->dev.driver, &driver_attr_micphone);
		if (ret) {
			dev_err(&pdev->dev, "create mic attr failed (%d)\n", ret);
			goto fail;
		}
	}
fail:
	if (cpu_np)
		of_node_put(cpu_np);
	if (codec_np)
		of_node_put(codec_np);

	return ret;
}

static const struct of_device_id imx_wm8960_dt_ids[] = {
	{ .compatible = "fsl,imx-audio-wm8960", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_wm8960_dt_ids);

static struct platform_driver imx_wm8960_driver = {
	.driver = {
		.name = "imx-wm8960",
		.owner = THIS_MODULE,
		.pm = &snd_soc_pm_ops,
		.of_match_table = imx_wm8960_dt_ids,
	},
	.probe = imx_wm8960_probe,
};
module_platform_driver(imx_wm8960_driver);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Freescale i.MX WM8960 ASoC machine driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:imx-wm8960");