ASoC: sti-sas: Add sti platform codec

Codec part of the sti platform that supports codec IPs.
This first version does not support HDMI, but only DAC and SPDIF out.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 627 insertions, 0 deletions

diff --git a/sound/soc/codecs/sti-sas.c b/sound/soc/codecs/sti-sas.c
new file mode 100644
index 000000000000..32db2c25a33f
--- /dev/null
+++ b/sound/soc/codecs/sti-sas.c
@@ -0,0 +1,627 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
+ *          for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/mfd/syscon.h>
+
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+/* chipID supported */
+#define CHIPID_STIH416 0
+#define CHIPID_STIH407 1
+
+/* DAC definitions */
+
+/* stih416 DAC registers */
+/* sysconf 2517: Audio-DAC-Control */
+#define STIH416_AUDIO_DAC_CTRL 0x00000814
+/* sysconf 2519: Audio-Gue-Control */
+#define STIH416_AUDIO_GLUE_CTRL 0x0000081C
+
+#define STIH416_DAC_NOT_STANDBY	0x3
+#define STIH416_DAC_SOFTMUTE	0x4
+#define STIH416_DAC_ANA_NOT_PWR	0x5
+#define STIH416_DAC_NOT_PNDBG	0x6
+
+#define STIH416_DAC_NOT_STANDBY_MASK	BIT(STIH416_DAC_NOT_STANDBY)
+#define STIH416_DAC_SOFTMUTE_MASK	BIT(STIH416_DAC_SOFTMUTE)
+#define STIH416_DAC_ANA_NOT_PWR_MASK	BIT(STIH416_DAC_ANA_NOT_PWR)
+#define STIH416_DAC_NOT_PNDBG_MASK	BIT(STIH416_DAC_NOT_PNDBG)
+
+/* stih407 DAC registers */
+/* sysconf 5041: Audio-Gue-Control */
+#define STIH407_AUDIO_GLUE_CTRL 0x000000A4
+/* sysconf 5042: Audio-DAC-Control */
+#define STIH407_AUDIO_DAC_CTRL 0x000000A8
+
+/* DAC definitions */
+#define STIH407_DAC_SOFTMUTE		0x0
+#define STIH407_DAC_STANDBY_ANA		0x1
+#define STIH407_DAC_STANDBY		0x2
+
+#define STIH407_DAC_SOFTMUTE_MASK	BIT(STIH407_DAC_SOFTMUTE)
+#define STIH407_DAC_STANDBY_ANA_MASK    BIT(STIH407_DAC_STANDBY_ANA)
+#define STIH407_DAC_STANDBY_MASK        BIT(STIH407_DAC_STANDBY)
+
+/* SPDIF definitions */
+#define SPDIF_BIPHASE_ENABLE		0x6
+#define SPDIF_BIPHASE_IDLE		0x7
+
+#define SPDIF_BIPHASE_ENABLE_MASK	BIT(SPDIF_BIPHASE_ENABLE)
+#define SPDIF_BIPHASE_IDLE_MASK		BIT(SPDIF_BIPHASE_IDLE)
+
+enum {
+	STI_SAS_DAI_SPDIF_OUT,
+	STI_SAS_DAI_ANALOG_OUT,
+};
+
+static const struct reg_default stih416_sas_reg_defaults[] = {
+	{ STIH407_AUDIO_GLUE_CTRL, 0x00000040 },
+	{ STIH407_AUDIO_DAC_CTRL, 0x000000000 },
+};
+
+static const struct reg_default stih407_sas_reg_defaults[] = {
+	{ STIH416_AUDIO_DAC_CTRL, 0x000000000 },
+	{ STIH416_AUDIO_GLUE_CTRL, 0x00000040 },
+};
+
+struct sti_dac_audio {
+	struct regmap *regmap;
+	struct regmap *virt_regmap;
+	struct regmap_field  **field;
+	struct reset_control *rst;
+	int mclk;
+};
+
+struct sti_spdif_audio {
+	struct regmap *regmap;
+	struct regmap_field  **field;
+	int mclk;
+};
+
+/* device data structure */
+struct sti_sas_dev_data {
+	const int chipid; /* IC version */
+	const struct regmap_config *regmap;
+	const struct snd_soc_dai_ops *dac_ops;  /* DAC function callbacks */
+	const struct snd_soc_dapm_widget *dapm_widgets; /* dapms declaration */
+	const int num_dapm_widgets; /* dapms declaration */
+	const struct snd_soc_dapm_route *dapm_routes; /* route declaration */
+	const int num_dapm_routes; /* route declaration */
+};
+
+/* driver data structure */
+struct sti_sas_data {
+	struct device *dev;
+	const struct sti_sas_dev_data *dev_data;
+	struct sti_dac_audio dac;
+	struct sti_spdif_audio spdif;
+};
+
+/* Read a register from the sysconf reg bank */
+static int sti_sas_read_reg(void *context, unsigned int reg,
+			    unsigned int *value)
+{
+	struct sti_sas_data *drvdata = context;
+	int status;
+	u32 val;
+
+	status = regmap_read(drvdata->dac.regmap, reg, &val);
+	*value = (unsigned int)val;
+
+	return status;
+}
+
+/* Read a register from the sysconf reg bank */
+static int sti_sas_write_reg(void *context, unsigned int reg,
+			     unsigned int value)
+{
+	struct sti_sas_data *drvdata = context;
+	int status;
+
+	status = regmap_write(drvdata->dac.regmap, reg, value);
+
+	return status;
+}
+
+static int  sti_sas_init_sas_registers(struct snd_soc_codec *codec,
+				       struct sti_sas_data *data)
+{
+	int ret;
+	/*
+	 * DAC and SPDIF are activated by default
+	 * put them in IDLE to save power
+	 */
+
+	/* Initialise bi-phase formatter to disabled */
+	ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+				  SPDIF_BIPHASE_ENABLE_MASK, 0);
+
+	if (!ret)
+		/* Initialise bi-phase formatter idle value to 0 */
+		ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+					  SPDIF_BIPHASE_IDLE_MASK, 0);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to update SPDIF registers");
+		return ret;
+	}
+
+	/* Init DAC configuration */
+	switch (data->dev_data->chipid) {
+	case CHIPID_STIH407:
+		/* init configuration */
+		ret =  snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+					   STIH407_DAC_STANDBY_MASK,
+					   STIH407_DAC_STANDBY_MASK);
+
+		if (!ret)
+			ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+						  STIH407_DAC_STANDBY_ANA_MASK,
+						  STIH407_DAC_STANDBY_ANA_MASK);
+		if (!ret)
+			ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+						  STIH407_DAC_SOFTMUTE_MASK,
+						  STIH407_DAC_SOFTMUTE_MASK);
+		break;
+	case CHIPID_STIH416:
+		ret =  snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
+					   STIH416_DAC_NOT_STANDBY_MASK, 0);
+		if (!ret)
+			ret =  snd_soc_update_bits(codec,
+						   STIH416_AUDIO_DAC_CTRL,
+						   STIH416_DAC_ANA_NOT_PWR, 0);
+		if (!ret)
+			ret =  snd_soc_update_bits(codec,
+						   STIH416_AUDIO_DAC_CTRL,
+						   STIH416_DAC_NOT_PNDBG_MASK,
+						   0);
+		if (!ret)
+			ret =  snd_soc_update_bits(codec,
+						   STIH416_AUDIO_DAC_CTRL,
+						   STIH416_DAC_SOFTMUTE_MASK,
+						   STIH416_DAC_SOFTMUTE_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to update DAC registers");
+		return ret;
+	}
+
+	return ret;
+}
+
+/*
+ * DAC
+ */
+static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	/* Sanity check only */
+	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+		dev_err(dai->codec->dev,
+			"%s: ERROR: Unsupporter master mask 0x%x\n",
+			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int stih416_dac_probe(struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+	struct sti_dac_audio *dac = &drvdata->dac;
+
+	/* Get reset control */
+	dac->rst = devm_reset_control_get(codec->dev, "dac_rst");
+	if (IS_ERR(dac->rst)) {
+		dev_err(dai->codec->dev,
+			"%s: ERROR: DAC reset control not defined (%d)!\n",
+			__func__, (int)dac->rst);
+		dac->rst = NULL;
+		return -EFAULT;
+	}
+	/* Put the DAC into reset */
+	reset_control_assert(dac->rst);
+
+	return 0;
+}
+
+const struct snd_soc_dapm_widget stih416_sas_dapm_widgets[] = {
+	SND_SOC_DAPM_PGA("DAC bandgap", STIH416_AUDIO_DAC_CTRL,
+			 STIH416_DAC_NOT_PNDBG_MASK, 0, NULL, 0),
+	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH416_AUDIO_DAC_CTRL,
+			     STIH416_DAC_ANA_NOT_PWR, 0, NULL, 0),
+	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH416_AUDIO_DAC_CTRL,
+			 STIH416_DAC_NOT_STANDBY, 0),
+	SND_SOC_DAPM_OUTPUT("DAC Output"),
+};
+
+const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = {
+	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL,
+			     STIH407_DAC_STANDBY_ANA, 1, NULL, 0),
+	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH407_AUDIO_DAC_CTRL,
+			 STIH407_DAC_STANDBY, 1),
+	SND_SOC_DAPM_OUTPUT("DAC Output"),
+};
+
+const struct snd_soc_dapm_route stih416_sas_route[] = {
+	{"DAC Output", NULL, "DAC bandgap"},
+	{"DAC Output", NULL, "DAC standby ana"},
+	{"DAC standby ana", NULL, "DAC standby"},
+};
+
+const struct snd_soc_dapm_route stih407_sas_route[] = {
+	{"DAC Output", NULL, "DAC standby ana"},
+	{"DAC standby ana", NULL, "DAC standby"},
+};
+
+static int stih416_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
+{
+	struct snd_soc_codec *codec = dai->codec;
+
+	if (mute) {
+		return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
+					    STIH416_DAC_SOFTMUTE_MASK,
+					    STIH416_DAC_SOFTMUTE_MASK);
+	} else {
+		return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
+					    STIH416_DAC_SOFTMUTE_MASK, 0);
+	}
+}
+
+static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
+{
+	struct snd_soc_codec *codec = dai->codec;
+
+	if (mute) {
+		return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+					    STIH407_DAC_SOFTMUTE_MASK,
+					    STIH407_DAC_SOFTMUTE_MASK);
+	} else {
+		return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+					    STIH407_DAC_SOFTMUTE_MASK,
+					    0);
+	}
+}
+
+/*
+ * SPDIF
+ */
+static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai,
+				 unsigned int fmt)
+{
+	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+		dev_err(dai->codec->dev,
+			"%s: ERROR: Unsupporter master mask 0x%x\n",
+			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * sti_sas_spdif_trigger:
+ * Trigger function is used to ensure that BiPhase Formater is disabled
+ * before CPU dai is stopped.
+ * This is mandatory to avoid that BPF is stalled
+ */
+static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+				 struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+					    SPDIF_BIPHASE_ENABLE_MASK,
+					    SPDIF_BIPHASE_ENABLE_MASK);
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+					    SPDIF_BIPHASE_ENABLE_MASK,
+					    0);
+	default:
+		return -EINVAL;
+	}
+}
+
+static bool sti_sas_volatile_register(struct device *dev, unsigned int reg)
+{
+	if (reg == STIH407_AUDIO_GLUE_CTRL)
+		return true;
+
+	return false;
+}
+
+/*
+ * CODEC DAIS
+ */
+
+/*
+ * sti_sas_set_sysclk:
+ * get MCLK input frequency to check that MCLK-FS ratio is coherent
+ */
+static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+			      unsigned int freq, int dir)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+
+	if (dir == SND_SOC_CLOCK_OUT)
+		return 0;
+
+	if (clk_id != 0)
+		return -EINVAL;
+
+	switch (dai->id) {
+	case STI_SAS_DAI_SPDIF_OUT:
+		drvdata->spdif.mclk = freq;
+		break;
+
+	case STI_SAS_DAI_ANALOG_OUT:
+		drvdata->dac.mclk = freq;
+		break;
+	}
+
+	return 0;
+}
+
+static int sti_sas_prepare(struct snd_pcm_substream *substream,
+			   struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	switch (dai->id) {
+	case STI_SAS_DAI_SPDIF_OUT:
+		if ((drvdata->spdif.mclk / runtime->rate) != 128) {
+			dev_err(codec->dev, "unexpected mclk-fs ratio");
+			return -EINVAL;
+		}
+		break;
+	case STI_SAS_DAI_ANALOG_OUT:
+		if ((drvdata->dac.mclk / runtime->rate) != 256) {
+			dev_err(codec->dev, "unexpected mclk-fs ratio");
+			return -EINVAL;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+const struct snd_soc_dai_ops stih416_dac_ops = {
+	.set_fmt = sti_sas_dac_set_fmt,
+	.mute_stream = stih416_sas_dac_mute,
+	.prepare = sti_sas_prepare,
+	.set_sysclk = sti_sas_set_sysclk,
+};
+
+const struct snd_soc_dai_ops stih407_dac_ops = {
+	.set_fmt = sti_sas_dac_set_fmt,
+	.mute_stream = stih407_sas_dac_mute,
+	.prepare = sti_sas_prepare,
+	.set_sysclk = sti_sas_set_sysclk,
+};
+
+const struct regmap_config stih407_sas_regmap = {
+	.reg_bits = 32,
+	.val_bits = 32,
+
+	.max_register = STIH407_AUDIO_DAC_CTRL,
+	.reg_defaults = stih407_sas_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults),
+	.volatile_reg = sti_sas_volatile_register,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_read = sti_sas_read_reg,
+	.reg_write = sti_sas_write_reg,
+};
+
+const struct regmap_config stih416_sas_regmap = {
+	.reg_bits = 32,
+	.val_bits = 32,
+
+	.max_register = STIH416_AUDIO_DAC_CTRL,
+	.reg_defaults = stih416_sas_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(stih416_sas_reg_defaults),
+	.volatile_reg = sti_sas_volatile_register,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_read = sti_sas_read_reg,
+	.reg_write = sti_sas_write_reg,
+};
+
+const struct sti_sas_dev_data stih416_data = {
+	.chipid = CHIPID_STIH416,
+	.regmap = &stih416_sas_regmap,
+	.dac_ops = &stih416_dac_ops,
+	.dapm_widgets = stih416_sas_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(stih416_sas_dapm_widgets),
+	.dapm_routes =	stih416_sas_route,
+	.num_dapm_routes = ARRAY_SIZE(stih416_sas_route),
+};
+
+const struct sti_sas_dev_data stih407_data = {
+	.chipid = CHIPID_STIH407,
+	.regmap = &stih407_sas_regmap,
+	.dac_ops = &stih407_dac_ops,
+	.dapm_widgets = stih407_sas_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets),
+	.dapm_routes =	stih407_sas_route,
+	.num_dapm_routes = ARRAY_SIZE(stih407_sas_route),
+};
+
+static struct snd_soc_dai_driver sti_sas_dai[] = {
+	{
+		.name = "sas-dai-spdif-out",
+		.id = STI_SAS_DAI_SPDIF_OUT,
+		.playback = {
+			.stream_name = "spdif_p",
+			.channels_min = 2,
+			.channels_max = 2,
+			.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 |
+				 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
+				 SNDRV_PCM_RATE_192000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE |
+				   SNDRV_PCM_FMTBIT_S32_LE,
+		},
+		.ops = (struct snd_soc_dai_ops[]) {
+			{
+				.set_fmt = sti_sas_spdif_set_fmt,
+				.trigger = sti_sas_spdif_trigger,
+				.set_sysclk = sti_sas_set_sysclk,
+				.prepare = sti_sas_prepare,
+			}
+		},
+	},
+	{
+		.name = "sas-dai-dac",
+		.id = STI_SAS_DAI_ANALOG_OUT,
+		.playback = {
+			.stream_name = "dac_p",
+			.channels_min = 2,
+			.channels_max = 2,
+			.rates = SNDRV_PCM_RATE_8000_48000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE |
+				   SNDRV_PCM_FMTBIT_S32_LE,
+		},
+	},
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int sti_sas_resume(struct snd_soc_codec *codec)
+{
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+
+	return sti_sas_init_sas_registers(codec, drvdata);
+}
+#else
+#define sti_sas_resume NULL
+#endif
+
+static int sti_sas_codec_probe(struct snd_soc_codec *codec)
+{
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+	int ret;
+
+	ret = sti_sas_init_sas_registers(codec, drvdata);
+
+	return ret;
+}
+
+static struct snd_soc_codec_driver sti_sas_driver = {
+	.probe = sti_sas_codec_probe,
+	.resume = sti_sas_resume,
+};
+
+static const struct of_device_id sti_sas_dev_match[] = {
+	{
+		.compatible = "st,stih416-sas-codec",
+		.data = &stih416_data,
+	},
+	{
+		.compatible = "st,stih407-sas-codec",
+		.data = &stih407_data,
+	},
+	{},
+};
+
+static int sti_sas_driver_probe(struct platform_device *pdev)
+{
+	struct device_node *pnode = pdev->dev.of_node;
+	struct sti_sas_data *drvdata;
+
+	/* Allocate device structure */
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data),
+			       GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	/* Populate data structure depending on compatibility */
+	if (!of_match_node(sti_sas_dev_match, pnode)->data) {
+		dev_err(&pdev->dev, "data associated to device is missing");
+		return -EINVAL;
+	}
+
+	drvdata->dev_data = of_match_node(sti_sas_dev_match, pnode)->data;
+
+	/* Initialise device structure */
+	drvdata->dev = &pdev->dev;
+
+	/* Request the DAC & SPDIF registers memory region */
+	drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata,
+						    drvdata->dev_data->regmap);
+	if (!drvdata->dac.virt_regmap) {
+		dev_err(&pdev->dev, "audio registers not enabled\n");
+		return -EFAULT;
+	}
+
+	/* Request the syscon region */
+	drvdata->dac.regmap =
+		syscon_regmap_lookup_by_phandle(pnode, "st,syscfg");
+	if (!drvdata->dac.regmap) {
+		dev_err(&pdev->dev, "syscon registers not available\n");
+		return -EFAULT;
+	}
+	drvdata->spdif.regmap = drvdata->dac.regmap;
+
+	/* Set DAC dai probe */
+	if (drvdata->dev_data->chipid == CHIPID_STIH416)
+		sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].probe = stih416_dac_probe;
+
+	sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops;
+
+	/* Set dapms*/
+	sti_sas_driver.dapm_widgets = drvdata->dev_data->dapm_widgets;
+	sti_sas_driver.num_dapm_widgets = drvdata->dev_data->num_dapm_widgets;
+
+	sti_sas_driver.dapm_routes = drvdata->dev_data->dapm_routes;
+	sti_sas_driver.num_dapm_routes = drvdata->dev_data->num_dapm_routes;
+
+	/* Store context */
+	dev_set_drvdata(&pdev->dev, drvdata);
+
+	return snd_soc_register_codec(&pdev->dev, &sti_sas_driver,
+					sti_sas_dai,
+					ARRAY_SIZE(sti_sas_dai));
+}
+
+static int sti_sas_driver_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_codec(&pdev->dev);
+
+	return 0;
+}
+
+static struct platform_driver sti_sas_platform_driver = {
+	.driver = {
+		.name = "sti-sas-codec",
+		.owner = THIS_MODULE,
+		.of_match_table = sti_sas_dev_match,
+	},
+	.probe = sti_sas_driver_probe,
+	.remove = sti_sas_driver_remove,
+};
+
+module_platform_driver(sti_sas_platform_driver);
+
+MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms");
+MODULE_AUTHOR("Arnaud.pouliquen@st.com");
+MODULE_LICENSE("GPL v2");