ASoC: meson: aiu: add internal dac codec control support

Add the codec to codec component which handles the routing between
the audio producers and the internal audio DAC found on the amlogic GXL
SoC family
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200213155159.3235792-7-jbrunet@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/meson/Makefile

 # SPDX-License-Identifier: (GPL-2.0 OR MIT)
 
 snd-soc-meson-aiu-objs := aiu.o
+snd-soc-meson-aiu-objs += aiu-acodec-ctrl.o
 snd-soc-meson-aiu-objs += aiu-codec-ctrl.o
 snd-soc-meson-aiu-objs += aiu-encoder-i2s.o
 snd-soc-meson-aiu-objs += aiu-encoder-spdif.o

sound/soc/meson/aiu-acodec-ctrl.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2020 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#include <linux/bitfield.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include <dt-bindings/sound/meson-aiu.h>
+#include "aiu.h"
+#include "meson-codec-glue.h"
+
+#define CTRL_DIN_EN			15
+#define CTRL_CLK_INV			BIT(14)
+#define CTRL_LRCLK_INV			BIT(13)
+#define CTRL_I2S_IN_BCLK_SRC		BIT(11)
+#define CTRL_DIN_LRCLK_SRC_SHIFT	6
+#define CTRL_DIN_LRCLK_SRC		(0x3 << CTRL_DIN_LRCLK_SRC_SHIFT)
+#define CTRL_BCLK_MCLK_SRC		GENMASK(5, 4)
+#define CTRL_DIN_SKEW			GENMASK(3, 2)
+#define CTRL_I2S_OUT_LANE_SRC		0
+
+#define AIU_ACODEC_OUT_CHMAX		2
+
+static const char * const aiu_acodec_ctrl_mux_texts[] = {
+	"DISABLED", "I2S", "PCM",
+};
+
+static int aiu_acodec_ctrl_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, changed;
+
+	mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
+	changed = snd_soc_component_test_bits(component, e->reg,
+					      CTRL_DIN_LRCLK_SRC,
+					      FIELD_PREP(CTRL_DIN_LRCLK_SRC,
+							 mux));
+
+	if (!changed)
+		return 0;
+
+	/* Force disconnect of the mux while updating */
+	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);
+
+	snd_soc_component_update_bits(component, e->reg,
+				      CTRL_DIN_LRCLK_SRC |
+				      CTRL_BCLK_MCLK_SRC,
+				      FIELD_PREP(CTRL_DIN_LRCLK_SRC, mux) |
+				      FIELD_PREP(CTRL_BCLK_MCLK_SRC, mux));
+
+	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);
+
+	return 0;
+}
+
+static SOC_ENUM_SINGLE_DECL(aiu_acodec_ctrl_mux_enum, AIU_ACODEC_CTRL,
+			    CTRL_DIN_LRCLK_SRC_SHIFT,
+			    aiu_acodec_ctrl_mux_texts);
+
+static const struct snd_kcontrol_new aiu_acodec_ctrl_mux =
+	SOC_DAPM_ENUM_EXT("ACodec Source", aiu_acodec_ctrl_mux_enum,
+			  snd_soc_dapm_get_enum_double,
+			  aiu_acodec_ctrl_mux_put_enum);
+
+static const struct snd_kcontrol_new aiu_acodec_ctrl_out_enable =
+	SOC_DAPM_SINGLE_AUTODISABLE("Switch", AIU_ACODEC_CTRL,
+				    CTRL_DIN_EN, 1, 0);
+
+static const struct snd_soc_dapm_widget aiu_acodec_ctrl_widgets[] = {
+	SND_SOC_DAPM_MUX("ACODEC SRC", SND_SOC_NOPM, 0, 0,
+			 &aiu_acodec_ctrl_mux),
+	SND_SOC_DAPM_SWITCH("ACODEC OUT EN", SND_SOC_NOPM, 0, 0,
+			    &aiu_acodec_ctrl_out_enable),
+};
+
+static int aiu_acodec_ctrl_input_hw_params(struct snd_pcm_substream *substream,
+					   struct snd_pcm_hw_params *params,
+					   struct snd_soc_dai *dai)
+{
+	struct meson_codec_glue_input *data;
+	int ret;
+
+	ret = meson_codec_glue_input_hw_params(substream, params, dai);
+	if (ret)
+		return ret;
+
+	/* The glue will provide 1 lane out of the 4 to the output */
+	data = meson_codec_glue_input_get_data(dai);
+	data->params.channels_min = min_t(unsigned int, AIU_ACODEC_OUT_CHMAX,
+					  data->params.channels_min);
+	data->params.channels_max = min_t(unsigned int, AIU_ACODEC_OUT_CHMAX,
+					  data->params.channels_max);
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops aiu_acodec_ctrl_input_ops = {
+	.hw_params	= aiu_acodec_ctrl_input_hw_params,
+	.set_fmt	= meson_codec_glue_input_set_fmt,
+};
+
+static const struct snd_soc_dai_ops aiu_acodec_ctrl_output_ops = {
+	.startup	= meson_codec_glue_output_startup,
+};
+
+#define AIU_ACODEC_CTRL_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 AIU_ACODEC_STREAM(xname, xsuffix, xchmax)		\
+{								\
+	.stream_name	= xname " " xsuffix,			\
+	.channels_min	= 1,					\
+	.channels_max	= (xchmax),				\
+	.rate_min       = 5512,					\
+	.rate_max	= 192000,				\
+	.formats	= AIU_ACODEC_CTRL_FORMATS,		\
+}
+
+#define AIU_ACODEC_INPUT(xname) {				\
+	.name = "ACODEC CTRL " xname,				\
+	.name = xname,						\
+	.playback = AIU_ACODEC_STREAM(xname, "Playback", 8),	\
+	.ops = &aiu_acodec_ctrl_input_ops,			\
+	.probe = meson_codec_glue_input_dai_probe,		\
+	.remove = meson_codec_glue_input_dai_remove,		\
+}
+
+#define AIU_ACODEC_OUTPUT(xname) {				\
+	.name = "ACODEC CTRL " xname,				\
+	.capture = AIU_ACODEC_STREAM(xname, "Capture", AIU_ACODEC_OUT_CHMAX), \
+	.ops = &aiu_acodec_ctrl_output_ops,			\
+}
+
+static struct snd_soc_dai_driver aiu_acodec_ctrl_dai_drv[] = {
+	[CTRL_I2S] = AIU_ACODEC_INPUT("ACODEC I2S IN"),
+	[CTRL_PCM] = AIU_ACODEC_INPUT("ACODEC PCM IN"),
+	[CTRL_OUT] = AIU_ACODEC_OUTPUT("ACODEC OUT"),
+};
+
+static const struct snd_soc_dapm_route aiu_acodec_ctrl_routes[] = {
+	{ "ACODEC SRC", "I2S", "ACODEC I2S IN Playback" },
+	{ "ACODEC SRC", "PCM", "ACODEC PCM IN Playback" },
+	{ "ACODEC OUT EN", "Switch", "ACODEC SRC" },
+	{ "ACODEC OUT Capture", NULL, "ACODEC OUT EN" },
+};
+
+static const struct snd_kcontrol_new aiu_acodec_ctrl_controls[] = {
+	SOC_SINGLE("ACODEC I2S Lane Select", AIU_ACODEC_CTRL,
+		   CTRL_I2S_OUT_LANE_SRC, 3, 0),
+};
+
+static int aiu_acodec_of_xlate_dai_name(struct snd_soc_component *component,
+					struct of_phandle_args *args,
+					const char **dai_name)
+{
+	return aiu_of_xlate_dai_name(component, args, dai_name, AIU_ACODEC);
+}
+
+static int aiu_acodec_ctrl_component_probe(struct snd_soc_component *component)
+{
+	/*
+	 * NOTE: Din Skew setting
+	 * According to the documentation, the following update adds one delay
+	 * to the din line. Without this, the output saturates. This happens
+	 * regardless of the link format (i2s or left_j) so it is not clear what
+	 * it actually does but it seems to be required
+	 */
+	snd_soc_component_update_bits(component, AIU_ACODEC_CTRL,
+				      CTRL_DIN_SKEW,
+				      FIELD_PREP(CTRL_DIN_SKEW, 2));
+
+	return 0;
+}
+
+static const struct snd_soc_component_driver aiu_acodec_ctrl_component = {
+	.name			= "AIU Internal DAC Codec Control",
+	.probe			= aiu_acodec_ctrl_component_probe,
+	.controls		= aiu_acodec_ctrl_controls,
+	.num_controls		= ARRAY_SIZE(aiu_acodec_ctrl_controls),
+	.dapm_widgets		= aiu_acodec_ctrl_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(aiu_acodec_ctrl_widgets),
+	.dapm_routes		= aiu_acodec_ctrl_routes,
+	.num_dapm_routes	= ARRAY_SIZE(aiu_acodec_ctrl_routes),
+	.of_xlate_dai_name	= aiu_acodec_of_xlate_dai_name,
+	.endianness		= 1,
+	.non_legacy_dai_naming	= 1,
+};
+
+int aiu_acodec_ctrl_register_component(struct device *dev)
+{
+	return aiu_add_component(dev, &aiu_acodec_ctrl_component,
+				 aiu_acodec_ctrl_dai_drv,
+				 ARRAY_SIZE(aiu_acodec_ctrl_dai_drv),
+				 "acodec");
+}

sound/soc/meson/aiu.c

@@ -345,6 +345,16 @@ static int aiu_probe(struct platform_device *pdev)
 		goto err;
 	}
 
+	/* Register the internal dac control component on gxl */
+	if (of_device_is_compatible(dev->of_node, "amlogic,aiu-gxl")) {
+		ret = aiu_acodec_ctrl_register_component(dev);
+		if (ret) {
+			dev_err(dev,
+			    "Failed to register acodec control component\n");
+			goto err;
+		}
+	}
+
 	return 0;
 err:
 	snd_soc_unregister_component(dev);

sound/soc/meson/aiu.h

@@ -52,6 +52,7 @@ int aiu_add_component(struct device *dev,
 		      const char *debugfs_prefix);
 
 int aiu_hdmi_ctrl_register_component(struct device *dev);
+int aiu_acodec_ctrl_register_component(struct device *dev);
 
 int aiu_fifo_i2s_dai_probe(struct snd_soc_dai *dai);
 int aiu_fifo_spdif_dai_probe(struct snd_soc_dai *dai);