sound/soc/meson/g12a-tohdmitx.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // Copyright (c) 2019 BayLibre, SAS.
 // Author: Jerome Brunet <jbrunet@baylibre.com>

 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/module.h>
 #include <sound/pcm_params.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <sound/soc.h>
 #include <sound/soc-dai.h>

 #include <dt-bindings/sound/meson-g12a-tohdmitx.h>

 #define G12A_TOHDMITX_DRV_NAME "g12a-tohdmitx"

 #define TOHDMITX_CTRL0			0x0
 #define  CTRL0_ENABLE_SHIFT		31
 #define  CTRL0_I2S_DAT_SEL		GENMASK(13, 12)
 #define  CTRL0_I2S_LRCLK_SEL		GENMASK(9, 8)
 #define  CTRL0_I2S_BLK_CAP_INV		BIT(7)
 #define  CTRL0_I2S_BCLK_O_INV		BIT(6)
 #define  CTRL0_I2S_BCLK_SEL		GENMASK(5, 4)
 #define  CTRL0_SPDIF_CLK_CAP_INV	BIT(3)
 #define  CTRL0_SPDIF_CLK_O_INV		BIT(2)
 #define  CTRL0_SPDIF_SEL		BIT(1)
 #define  CTRL0_SPDIF_CLK_SEL		BIT(0)

 struct g12a_tohdmitx_input {
 	struct snd_soc_pcm_stream params;
 	unsigned int fmt;
 };

 static struct snd_soc_dapm_widget *
 g12a_tohdmitx_get_input(struct snd_soc_dapm_widget *w)
 {
 	struct snd_soc_dapm_path *p = NULL;
 	struct snd_soc_dapm_widget *in;

 	snd_soc_dapm_widget_for_each_source_path(w, p) {
 		if (!p->connect)
 			continue;

 		/* Check that we still are in the same component */
 		if (snd_soc_dapm_to_component(w->dapm) !=
 		    snd_soc_dapm_to_component(p->source->dapm))
 			continue;

 		if (p->source->id == snd_soc_dapm_dai_in)
 			return p->source;

 		in = g12a_tohdmitx_get_input(p->source);
 		if (in)
 			return in;
 	}

 	return NULL;
 }

 static struct g12a_tohdmitx_input *
 g12a_tohdmitx_get_input_data(struct snd_soc_dapm_widget *w)
 {
 	struct snd_soc_dapm_widget *in =
 		g12a_tohdmitx_get_input(w);
 	struct snd_soc_dai *dai;

 	if (WARN_ON(!in))
 		return NULL;

 	dai = in->priv;

 	return dai->playback_dma_data;
 }

 static const char * const g12a_tohdmitx_i2s_mux_texts[] = {
 	"I2S A", "I2S B", "I2S C",
 };

 static SOC_ENUM_SINGLE_EXT_DECL(g12a_tohdmitx_i2s_mux_enum,
 				g12a_tohdmitx_i2s_mux_texts);

 static int g12a_tohdmitx_get_input_val(struct snd_soc_component *component,
 				       unsigned int mask)
 {
 	unsigned int val;

 	snd_soc_component_read(component, TOHDMITX_CTRL0, &val);
 	return (val & mask) >> __ffs(mask);
 }

 static int g12a_tohdmitx_i2s_mux_get_enum(struct snd_kcontrol *kcontrol,
 					  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_kcontrol_component(kcontrol);

 	ucontrol->value.enumerated.item[0] =
 		g12a_tohdmitx_get_input_val(component, CTRL0_I2S_DAT_SEL);

 	return 0;
 }

 static int g12a_tohdmitx_i2s_mux_put_enum(struct snd_kcontrol *kcontrol,
 					  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_kcontrol_component(kcontrol);
 	struct snd_soc_dapm_context *dapm =
 		snd_soc_dapm_kcontrol_dapm(kcontrol);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	unsigned int mux = ucontrol->value.enumerated.item[0];
 	unsigned int val = g12a_tohdmitx_get_input_val(component,
 						       CTRL0_I2S_DAT_SEL);

 	/* Force disconnect of the mux while updating */
 	if (val != mux)
 		snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);

 	snd_soc_component_update_bits(component, TOHDMITX_CTRL0,
 				      CTRL0_I2S_DAT_SEL |
 				      CTRL0_I2S_LRCLK_SEL |
 				      CTRL0_I2S_BCLK_SEL,
 				      FIELD_PREP(CTRL0_I2S_DAT_SEL, mux) |
 				      FIELD_PREP(CTRL0_I2S_LRCLK_SEL, mux) |
 				      FIELD_PREP(CTRL0_I2S_BCLK_SEL, mux));

 	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);

 	return 0;
 }

 static const struct snd_kcontrol_new g12a_tohdmitx_i2s_mux =
 	SOC_DAPM_ENUM_EXT("I2S Source", g12a_tohdmitx_i2s_mux_enum,
 			  g12a_tohdmitx_i2s_mux_get_enum,
 			  g12a_tohdmitx_i2s_mux_put_enum);

 static const char * const g12a_tohdmitx_spdif_mux_texts[] = {
 	"SPDIF A", "SPDIF B",
 };

 static SOC_ENUM_SINGLE_EXT_DECL(g12a_tohdmitx_spdif_mux_enum,
 				g12a_tohdmitx_spdif_mux_texts);

 static int g12a_tohdmitx_spdif_mux_get_enum(struct snd_kcontrol *kcontrol,
 					    struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_kcontrol_component(kcontrol);

 	ucontrol->value.enumerated.item[0] =
 		g12a_tohdmitx_get_input_val(component, CTRL0_SPDIF_SEL);

 	return 0;
 }

 static int g12a_tohdmitx_spdif_mux_put_enum(struct snd_kcontrol *kcontrol,
 					    struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_kcontrol_component(kcontrol);
 	struct snd_soc_dapm_context *dapm =
 		snd_soc_dapm_kcontrol_dapm(kcontrol);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	unsigned int mux = ucontrol->value.enumerated.item[0];
 	unsigned int val = g12a_tohdmitx_get_input_val(component,
 						       CTRL0_SPDIF_SEL);

 	/* Force disconnect of the mux while updating */
 	if (val != mux)
 		snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);

 	snd_soc_component_update_bits(component, TOHDMITX_CTRL0,
 				      CTRL0_SPDIF_SEL |
 				      CTRL0_SPDIF_CLK_SEL,
 				      FIELD_PREP(CTRL0_SPDIF_SEL, mux) |
 				      FIELD_PREP(CTRL0_SPDIF_CLK_SEL, mux));

 	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);

 	return 0;
 }

 static const struct snd_kcontrol_new g12a_tohdmitx_spdif_mux =
 	SOC_DAPM_ENUM_EXT("SPDIF Source", g12a_tohdmitx_spdif_mux_enum,
 			  g12a_tohdmitx_spdif_mux_get_enum,
 			  g12a_tohdmitx_spdif_mux_put_enum);

 static const struct snd_kcontrol_new g12a_tohdmitx_out_enable =
 	SOC_DAPM_SINGLE_AUTODISABLE("Switch", TOHDMITX_CTRL0,
 				    CTRL0_ENABLE_SHIFT, 1, 0);

 static const struct snd_soc_dapm_widget g12a_tohdmitx_widgets[] = {
 	SND_SOC_DAPM_MUX("I2S SRC", SND_SOC_NOPM, 0, 0,
 			 &g12a_tohdmitx_i2s_mux),
 	SND_SOC_DAPM_SWITCH("I2S OUT EN", SND_SOC_NOPM, 0, 0,
 			    &g12a_tohdmitx_out_enable),
 	SND_SOC_DAPM_MUX("SPDIF SRC", SND_SOC_NOPM, 0, 0,
 			 &g12a_tohdmitx_spdif_mux),
 	SND_SOC_DAPM_SWITCH("SPDIF OUT EN", SND_SOC_NOPM, 0, 0,
 			    &g12a_tohdmitx_out_enable),
 };

 static int g12a_tohdmitx_input_probe(struct snd_soc_dai *dai)
 {
 	struct g12a_tohdmitx_input *data;

 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	dai->playback_dma_data = data;
 	return 0;
 }

 static int g12a_tohdmitx_input_remove(struct snd_soc_dai *dai)
 {
 	kfree(dai->playback_dma_data);
 	return 0;
 }

 static int g12a_tohdmitx_input_hw_params(struct snd_pcm_substream *substream,
 					 struct snd_pcm_hw_params *params,
 					 struct snd_soc_dai *dai)
 {
 	struct g12a_tohdmitx_input *data = dai->playback_dma_data;

 	data->params.rates = snd_pcm_rate_to_rate_bit(params_rate(params));
 	data->params.rate_min = params_rate(params);
 	data->params.rate_max = params_rate(params);
 	data->params.formats = 1 << params_format(params);
 	data->params.channels_min = params_channels(params);
 	data->params.channels_max = params_channels(params);
 	data->params.sig_bits = dai->driver->playback.sig_bits;

 	return 0;
 }


 static int g12a_tohdmitx_input_set_fmt(struct snd_soc_dai *dai,
 				       unsigned int fmt)
 {
 	struct g12a_tohdmitx_input *data = dai->playback_dma_data;

 	/* Save the source stream format for the downstream link */
 	data->fmt = fmt;
 	return 0;
 }

 static int g12a_tohdmitx_output_startup(struct snd_pcm_substream *substream,
 					struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct g12a_tohdmitx_input *in_data =
 		g12a_tohdmitx_get_input_data(dai->capture_widget);

 	if (!in_data)
 		return -ENODEV;

 	if (WARN_ON(!rtd->dai_link->params)) {
 		dev_warn(dai->dev, "codec2codec link expected\n");
 		return -EINVAL;
 	}

 	/* Replace link params with the input params */
 	rtd->dai_link->params = &in_data->params;

 	if (!in_data->fmt)
 		return 0;

 	return snd_soc_runtime_set_dai_fmt(rtd, in_data->fmt);
 }

 static const struct snd_soc_dai_ops g12a_tohdmitx_input_ops = {
 	.hw_params	= g12a_tohdmitx_input_hw_params,
 	.set_fmt	= g12a_tohdmitx_input_set_fmt,
 };

 static const struct snd_soc_dai_ops g12a_tohdmitx_output_ops = {
 	.startup	= g12a_tohdmitx_output_startup,
 };

 #define TOHDMITX_SPDIF_FORMATS					\
 	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |	\
 	 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE)

 #define TOHDMITX_I2S_FORMATS					\
 	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |	\
 	 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE |	\
 	 SNDRV_PCM_FMTBIT_S32_LE)

 #define TOHDMITX_STREAM(xname, xsuffix, xfmt, xchmax)		\
 {								\
 	.stream_name	= xname " " xsuffix,			\
 	.channels_min	= 1,					\
 	.channels_max	= (xchmax),				\
 	.rate_min       = 8000,					\
 	.rate_max	= 192000,				\
 	.formats	= (xfmt),				\
 }

 #define TOHDMITX_IN(xname, xid, xfmt, xchmax) {				\
 	.name = xname,							\
 	.id = (xid),							\
 	.playback = TOHDMITX_STREAM(xname, "Playback", xfmt, xchmax),	\
 	.ops = &g12a_tohdmitx_input_ops,				\
 	.probe = g12a_tohdmitx_input_probe,				\
 	.remove = g12a_tohdmitx_input_remove,				\
 }

 #define TOHDMITX_OUT(xname, xid, xfmt, xchmax) {			\
 	.name = xname,							\
 	.id = (xid),							\
 	.capture = TOHDMITX_STREAM(xname, "Capture", xfmt, xchmax),	\
 	.ops = &g12a_tohdmitx_output_ops,				\
 }

 static struct snd_soc_dai_driver g12a_tohdmitx_dai_drv[] = {
 	TOHDMITX_IN("I2S IN A", TOHDMITX_I2S_IN_A,
 		    TOHDMITX_I2S_FORMATS, 8),
 	TOHDMITX_IN("I2S IN B", TOHDMITX_I2S_IN_B,
 		    TOHDMITX_I2S_FORMATS, 8),
 	TOHDMITX_IN("I2S IN C", TOHDMITX_I2S_IN_C,
 		    TOHDMITX_I2S_FORMATS, 8),
 	TOHDMITX_OUT("I2S OUT", TOHDMITX_I2S_OUT,
 		     TOHDMITX_I2S_FORMATS, 8),
 	TOHDMITX_IN("SPDIF IN A", TOHDMITX_SPDIF_IN_A,
 		    TOHDMITX_SPDIF_FORMATS, 2),
 	TOHDMITX_IN("SPDIF IN B", TOHDMITX_SPDIF_IN_B,
 		    TOHDMITX_SPDIF_FORMATS, 2),
 	TOHDMITX_OUT("SPDIF OUT", TOHDMITX_SPDIF_OUT,
 		     TOHDMITX_SPDIF_FORMATS, 2),
 };

 static int g12a_tohdmi_component_probe(struct snd_soc_component *c)
 {
 	/* Initialize the static clock parameters */
 	return snd_soc_component_write(c, TOHDMITX_CTRL0,
 		     CTRL0_I2S_BLK_CAP_INV | CTRL0_SPDIF_CLK_CAP_INV);
 }

 static const struct snd_soc_dapm_route g12a_tohdmitx_routes[] = {
 	{ "I2S SRC", "I2S A", "I2S IN A Playback" },
 	{ "I2S SRC", "I2S B", "I2S IN B Playback" },
 	{ "I2S SRC", "I2S C", "I2S IN C Playback" },
 	{ "I2S OUT EN", "Switch", "I2S SRC" },
 	{ "I2S OUT Capture", NULL, "I2S OUT EN" },
 	{ "SPDIF SRC", "SPDIF A", "SPDIF IN A Playback" },
 	{ "SPDIF SRC", "SPDIF B", "SPDIF IN B Playback" },
 	{ "SPDIF OUT EN", "Switch", "SPDIF SRC" },
 	{ "SPDIF OUT Capture", NULL, "SPDIF OUT EN" },
 };

 static const struct snd_soc_component_driver g12a_tohdmitx_component_drv = {
 	.probe			= g12a_tohdmi_component_probe,
 	.dapm_widgets		= g12a_tohdmitx_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(g12a_tohdmitx_widgets),
 	.dapm_routes		= g12a_tohdmitx_routes,
 	.num_dapm_routes	= ARRAY_SIZE(g12a_tohdmitx_routes),
 	.endianness		= 1,
 	.non_legacy_dai_naming	= 1,
 };

 static const struct regmap_config g12a_tohdmitx_regmap_cfg = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
 	.reg_stride	= 4,
 };

 static const struct of_device_id g12a_tohdmitx_of_match[] = {
 	{ .compatible = "amlogic,g12a-tohdmitx", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, g12a_tohdmitx_of_match);

 static int g12a_tohdmitx_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	void __iomem *regs;
 	struct regmap *map;
 	int ret;

 	ret = device_reset(dev);
 	if (ret)
 		return ret;

 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);

 	map = devm_regmap_init_mmio(dev, regs, &g12a_tohdmitx_regmap_cfg);
 	if (IS_ERR(map)) {
 		dev_err(dev, "failed to init regmap: %ld\n",
 			PTR_ERR(map));
 		return PTR_ERR(map);
 	}

 	return devm_snd_soc_register_component(dev,
 			&g12a_tohdmitx_component_drv, g12a_tohdmitx_dai_drv,
 			ARRAY_SIZE(g12a_tohdmitx_dai_drv));
 }

 static struct platform_driver g12a_tohdmitx_pdrv = {
 	.driver = {
 		.name = G12A_TOHDMITX_DRV_NAME,
 		.of_match_table = g12a_tohdmitx_of_match,
 	},
 	.probe = g12a_tohdmitx_probe,
 };
 module_platform_driver(g12a_tohdmitx_pdrv);

 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 MODULE_DESCRIPTION("Amlogic G12a To HDMI Tx Control Codec Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	//
	// Copyright (c) 2019 BayLibre, SAS.
	// Author: Jerome Brunet <jbrunet@baylibre.com>

	#include <linux/bitfield.h>
	#include <linux/clk.h>
	#include <linux/module.h>
	#include <sound/pcm_params.h>
	#include <linux/regmap.h>
	#include <linux/reset.h>
	#include <sound/soc.h>
	#include <sound/soc-dai.h>

	#include <dt-bindings/sound/meson-g12a-tohdmitx.h>

	#define G12A_TOHDMITX_DRV_NAME "g12a-tohdmitx"

	#define TOHDMITX_CTRL0 0x0
	#define CTRL0_ENABLE_SHIFT 31
	#define CTRL0_I2S_DAT_SEL GENMASK(13, 12)
	#define CTRL0_I2S_LRCLK_SEL GENMASK(9, 8)
	#define CTRL0_I2S_BLK_CAP_INV BIT(7)
	#define CTRL0_I2S_BCLK_O_INV BIT(6)
	#define CTRL0_I2S_BCLK_SEL GENMASK(5, 4)
	#define CTRL0_SPDIF_CLK_CAP_INV BIT(3)
	#define CTRL0_SPDIF_CLK_O_INV BIT(2)
	#define CTRL0_SPDIF_SEL BIT(1)
	#define CTRL0_SPDIF_CLK_SEL BIT(0)

	struct g12a_tohdmitx_input {
	struct snd_soc_pcm_stream params;
	unsigned int fmt;
	};

	static struct snd_soc_dapm_widget *
	g12a_tohdmitx_get_input(struct snd_soc_dapm_widget *w)
	{
	struct snd_soc_dapm_path *p = NULL;
	struct snd_soc_dapm_widget *in;

	snd_soc_dapm_widget_for_each_source_path(w, p) {
	if (!p->connect)
	continue;

	/* Check that we still are in the same component */
	if (snd_soc_dapm_to_component(w->dapm) !=
	snd_soc_dapm_to_component(p->source->dapm))
	continue;

	if (p->source->id == snd_soc_dapm_dai_in)
	return p->source;

	in = g12a_tohdmitx_get_input(p->source);
	if (in)
	return in;
	}

	return NULL;
	}

	static struct g12a_tohdmitx_input *
	g12a_tohdmitx_get_input_data(struct snd_soc_dapm_widget *w)
	{
	struct snd_soc_dapm_widget *in =
	g12a_tohdmitx_get_input(w);
	struct snd_soc_dai *dai;

	if (WARN_ON(!in))
	return NULL;

	dai = in->priv;

	return dai->playback_dma_data;
	}

	static const char * const g12a_tohdmitx_i2s_mux_texts[] = {
	"I2S A", "I2S B", "I2S C",
	};

	static SOC_ENUM_SINGLE_EXT_DECL(g12a_tohdmitx_i2s_mux_enum,
	g12a_tohdmitx_i2s_mux_texts);

	static int g12a_tohdmitx_get_input_val(struct snd_soc_component *component,
	unsigned int mask)
	{
	unsigned int val;

	snd_soc_component_read(component, TOHDMITX_CTRL0, &val);
	return (val & mask) >> __ffs(mask);
	}

	static int g12a_tohdmitx_i2s_mux_get_enum(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_component *component =
	snd_soc_dapm_kcontrol_component(kcontrol);

	ucontrol->value.enumerated.item[0] =
	g12a_tohdmitx_get_input_val(component, CTRL0_I2S_DAT_SEL);

	return 0;
	}

	static int g12a_tohdmitx_i2s_mux_put_enum(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_component *component =
	snd_soc_dapm_kcontrol_component(kcontrol);
	struct snd_soc_dapm_context *dapm =
	snd_soc_dapm_kcontrol_dapm(kcontrol);
	struct soc_enum e = (struct soc_enum )kcontrol->private_value;
	unsigned int mux = ucontrol->value.enumerated.item[0];
	unsigned int val = g12a_tohdmitx_get_input_val(component,
	CTRL0_I2S_DAT_SEL);

	/* Force disconnect of the mux while updating */
	if (val != mux)
	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);

	snd_soc_component_update_bits(component, TOHDMITX_CTRL0,
	CTRL0_I2S_DAT_SEL \|
	CTRL0_I2S_LRCLK_SEL \|
	CTRL0_I2S_BCLK_SEL,
	FIELD_PREP(CTRL0_I2S_DAT_SEL, mux) \|
	FIELD_PREP(CTRL0_I2S_LRCLK_SEL, mux) \|
	FIELD_PREP(CTRL0_I2S_BCLK_SEL, mux));

	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);

	return 0;
	}

	static const struct snd_kcontrol_new g12a_tohdmitx_i2s_mux =
	SOC_DAPM_ENUM_EXT("I2S Source", g12a_tohdmitx_i2s_mux_enum,
	g12a_tohdmitx_i2s_mux_get_enum,
	g12a_tohdmitx_i2s_mux_put_enum);

	static const char * const g12a_tohdmitx_spdif_mux_texts[] = {
	"SPDIF A", "SPDIF B",
	};

	static SOC_ENUM_SINGLE_EXT_DECL(g12a_tohdmitx_spdif_mux_enum,
	g12a_tohdmitx_spdif_mux_texts);

	static int g12a_tohdmitx_spdif_mux_get_enum(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_component *component =
	snd_soc_dapm_kcontrol_component(kcontrol);

	ucontrol->value.enumerated.item[0] =
	g12a_tohdmitx_get_input_val(component, CTRL0_SPDIF_SEL);

	return 0;
	}

	static int g12a_tohdmitx_spdif_mux_put_enum(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_component *component =
	snd_soc_dapm_kcontrol_component(kcontrol);
	struct snd_soc_dapm_context *dapm =
	snd_soc_dapm_kcontrol_dapm(kcontrol);
	struct soc_enum e = (struct soc_enum )kcontrol->private_value;
	unsigned int mux = ucontrol->value.enumerated.item[0];
	unsigned int val = g12a_tohdmitx_get_input_val(component,
	CTRL0_SPDIF_SEL);

	/* Force disconnect of the mux while updating */
	if (val != mux)
	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);

	snd_soc_component_update_bits(component, TOHDMITX_CTRL0,
	CTRL0_SPDIF_SEL \|
	CTRL0_SPDIF_CLK_SEL,
	FIELD_PREP(CTRL0_SPDIF_SEL, mux) \|
	FIELD_PREP(CTRL0_SPDIF_CLK_SEL, mux));

	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);

	return 0;
	}

	static const struct snd_kcontrol_new g12a_tohdmitx_spdif_mux =
	SOC_DAPM_ENUM_EXT("SPDIF Source", g12a_tohdmitx_spdif_mux_enum,
	g12a_tohdmitx_spdif_mux_get_enum,
	g12a_tohdmitx_spdif_mux_put_enum);

	static const struct snd_kcontrol_new g12a_tohdmitx_out_enable =
	SOC_DAPM_SINGLE_AUTODISABLE("Switch", TOHDMITX_CTRL0,
	CTRL0_ENABLE_SHIFT, 1, 0);

	static const struct snd_soc_dapm_widget g12a_tohdmitx_widgets[] = {
	SND_SOC_DAPM_MUX("I2S SRC", SND_SOC_NOPM, 0, 0,
	&g12a_tohdmitx_i2s_mux),
	SND_SOC_DAPM_SWITCH("I2S OUT EN", SND_SOC_NOPM, 0, 0,
	&g12a_tohdmitx_out_enable),
	SND_SOC_DAPM_MUX("SPDIF SRC", SND_SOC_NOPM, 0, 0,
	&g12a_tohdmitx_spdif_mux),
	SND_SOC_DAPM_SWITCH("SPDIF OUT EN", SND_SOC_NOPM, 0, 0,
	&g12a_tohdmitx_out_enable),
	};

	static int g12a_tohdmitx_input_probe(struct snd_soc_dai *dai)
	{
	struct g12a_tohdmitx_input *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	dai->playback_dma_data = data;
	return 0;
	}

	static int g12a_tohdmitx_input_remove(struct snd_soc_dai *dai)
	{
	kfree(dai->playback_dma_data);
	return 0;
	}

	static int g12a_tohdmitx_input_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct g12a_tohdmitx_input *data = dai->playback_dma_data;

	data->params.rates = snd_pcm_rate_to_rate_bit(params_rate(params));
	data->params.rate_min = params_rate(params);
	data->params.rate_max = params_rate(params);
	data->params.formats = 1 << params_format(params);
	data->params.channels_min = params_channels(params);
	data->params.channels_max = params_channels(params);
	data->params.sig_bits = dai->driver->playback.sig_bits;

	return 0;
	}


	static int g12a_tohdmitx_input_set_fmt(struct snd_soc_dai *dai,
	unsigned int fmt)
	{
	struct g12a_tohdmitx_input *data = dai->playback_dma_data;

	/* Save the source stream format for the downstream link */
	data->fmt = fmt;
	return 0;
	}

	static int g12a_tohdmitx_output_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct g12a_tohdmitx_input *in_data =
	g12a_tohdmitx_get_input_data(dai->capture_widget);

	if (!in_data)
	return -ENODEV;

	if (WARN_ON(!rtd->dai_link->params)) {
	dev_warn(dai->dev, "codec2codec link expected\n");
	return -EINVAL;
	}

	/* Replace link params with the input params */
	rtd->dai_link->params = &in_data->params;

	if (!in_data->fmt)
	return 0;

	return snd_soc_runtime_set_dai_fmt(rtd, in_data->fmt);
	}

	static const struct snd_soc_dai_ops g12a_tohdmitx_input_ops = {
	.hw_params = g12a_tohdmitx_input_hw_params,
	.set_fmt = g12a_tohdmitx_input_set_fmt,
	};

	static const struct snd_soc_dai_ops g12a_tohdmitx_output_ops = {
	.startup = g12a_tohdmitx_output_startup,
	};

	#define TOHDMITX_SPDIF_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \| \
	SNDRV_PCM_FMTBIT_S24_3LE \| SNDRV_PCM_FMTBIT_S24_LE)

	#define TOHDMITX_I2S_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \| \
	SNDRV_PCM_FMTBIT_S24_3LE \| SNDRV_PCM_FMTBIT_S24_LE \| \
	SNDRV_PCM_FMTBIT_S32_LE)

	#define TOHDMITX_STREAM(xname, xsuffix, xfmt, xchmax) \
	{ \
	.stream_name = xname " " xsuffix, \
	.channels_min = 1, \
	.channels_max = (xchmax), \
	.rate_min = 8000, \
	.rate_max = 192000, \
	.formats = (xfmt), \
	}

	#define TOHDMITX_IN(xname, xid, xfmt, xchmax) { \
	.name = xname, \
	.id = (xid), \
	.playback = TOHDMITX_STREAM(xname, "Playback", xfmt, xchmax), \
	.ops = &g12a_tohdmitx_input_ops, \
	.probe = g12a_tohdmitx_input_probe, \
	.remove = g12a_tohdmitx_input_remove, \
	}

	#define TOHDMITX_OUT(xname, xid, xfmt, xchmax) { \
	.name = xname, \
	.id = (xid), \
	.capture = TOHDMITX_STREAM(xname, "Capture", xfmt, xchmax), \
	.ops = &g12a_tohdmitx_output_ops, \
	}

	static struct snd_soc_dai_driver g12a_tohdmitx_dai_drv[] = {
	TOHDMITX_IN("I2S IN A", TOHDMITX_I2S_IN_A,
	TOHDMITX_I2S_FORMATS, 8),
	TOHDMITX_IN("I2S IN B", TOHDMITX_I2S_IN_B,
	TOHDMITX_I2S_FORMATS, 8),
	TOHDMITX_IN("I2S IN C", TOHDMITX_I2S_IN_C,
	TOHDMITX_I2S_FORMATS, 8),
	TOHDMITX_OUT("I2S OUT", TOHDMITX_I2S_OUT,
	TOHDMITX_I2S_FORMATS, 8),
	TOHDMITX_IN("SPDIF IN A", TOHDMITX_SPDIF_IN_A,
	TOHDMITX_SPDIF_FORMATS, 2),
	TOHDMITX_IN("SPDIF IN B", TOHDMITX_SPDIF_IN_B,
	TOHDMITX_SPDIF_FORMATS, 2),
	TOHDMITX_OUT("SPDIF OUT", TOHDMITX_SPDIF_OUT,
	TOHDMITX_SPDIF_FORMATS, 2),
	};

	static int g12a_tohdmi_component_probe(struct snd_soc_component *c)
	{
	/* Initialize the static clock parameters */
	return snd_soc_component_write(c, TOHDMITX_CTRL0,
	CTRL0_I2S_BLK_CAP_INV \| CTRL0_SPDIF_CLK_CAP_INV);
	}

	static const struct snd_soc_dapm_route g12a_tohdmitx_routes[] = {
	{ "I2S SRC", "I2S A", "I2S IN A Playback" },
	{ "I2S SRC", "I2S B", "I2S IN B Playback" },
	{ "I2S SRC", "I2S C", "I2S IN C Playback" },
	{ "I2S OUT EN", "Switch", "I2S SRC" },
	{ "I2S OUT Capture", NULL, "I2S OUT EN" },
	{ "SPDIF SRC", "SPDIF A", "SPDIF IN A Playback" },
	{ "SPDIF SRC", "SPDIF B", "SPDIF IN B Playback" },
	{ "SPDIF OUT EN", "Switch", "SPDIF SRC" },
	{ "SPDIF OUT Capture", NULL, "SPDIF OUT EN" },
	};

	static const struct snd_soc_component_driver g12a_tohdmitx_component_drv = {
	.probe = g12a_tohdmi_component_probe,
	.dapm_widgets = g12a_tohdmitx_widgets,
	.num_dapm_widgets = ARRAY_SIZE(g12a_tohdmitx_widgets),
	.dapm_routes = g12a_tohdmitx_routes,
	.num_dapm_routes = ARRAY_SIZE(g12a_tohdmitx_routes),
	.endianness = 1,
	.non_legacy_dai_naming = 1,
	};

	static const struct regmap_config g12a_tohdmitx_regmap_cfg = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	};

	static const struct of_device_id g12a_tohdmitx_of_match[] = {
	{ .compatible = "amlogic,g12a-tohdmitx", },
	{}
	};
	MODULE_DEVICE_TABLE(of, g12a_tohdmitx_of_match);

	static int g12a_tohdmitx_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	void __iomem *regs;
	struct regmap *map;
	int ret;

	ret = device_reset(dev);
	if (ret)
	return ret;

	regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(regs))
	return PTR_ERR(regs);

	map = devm_regmap_init_mmio(dev, regs, &g12a_tohdmitx_regmap_cfg);
	if (IS_ERR(map)) {
	dev_err(dev, "failed to init regmap: %ld\n",
	PTR_ERR(map));
	return PTR_ERR(map);
	}

	return devm_snd_soc_register_component(dev,
	&g12a_tohdmitx_component_drv, g12a_tohdmitx_dai_drv,
	ARRAY_SIZE(g12a_tohdmitx_dai_drv));
	}

	static struct platform_driver g12a_tohdmitx_pdrv = {
	.driver = {
	.name = G12A_TOHDMITX_DRV_NAME,
	.of_match_table = g12a_tohdmitx_of_match,
	},
	.probe = g12a_tohdmitx_probe,
	};
	module_platform_driver(g12a_tohdmitx_pdrv);

	MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
	MODULE_DESCRIPTION("Amlogic G12a To HDMI Tx Control Codec Driver");
	MODULE_LICENSE("GPL v2");