This patch adds a CODEC driver for the NXP TDA998x HDMI transmitter.
The CODEC handles both I2S and S/PDIF input and does dynamic input
switch in the TDA998x I2C driver on audio streaming start/stop.
Signed-off-by: Jean-Francois Moine <moin...@free.fr>
---
sound/soc/codecs/Kconfig | 6 ++
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/tda998x.c | 237 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 245 insertions(+)
create mode 100644 sound/soc/codecs/tda998x.c
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index b33b45d..747e387 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -352,6 +352,12 @@ config SND_SOC_STAC9766
config SND_SOC_TAS5086
tristate
+config SND_SOC_TDA998X
+ tristate
+ depends on OF
+ default y if DRM_I2C_NXP_TDA998X=y
+ default m if DRM_I2C_NXP_TDA998X=m
+
config SND_SOC_TLV320AIC23
tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index bc12676..a53d09e 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -62,6 +62,7 @@ snd-soc-sta32x-objs := sta32x.o
snd-soc-sta529-objs := sta529.o
snd-soc-stac9766-objs := stac9766.o
snd-soc-tas5086-objs := tas5086.o
+snd-soc-tda998x-objs := tda998x.o
snd-soc-tlv320aic23-objs := tlv320aic23.o
snd-soc-tlv320aic26-objs := tlv320aic26.o
snd-soc-tlv320aic3x-objs := tlv320aic3x.o
@@ -192,6 +193,7 @@ obj-$(CONFIG_SND_SOC_STA32X) += snd-soc-sta32x.o
obj-$(CONFIG_SND_SOC_STA529) += snd-soc-sta529.o
obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o
obj-$(CONFIG_SND_SOC_TAS5086) += snd-soc-tas5086.o
+obj-$(CONFIG_SND_SOC_TDA998X) += snd-soc-tda998x.o
obj-$(CONFIG_SND_SOC_TLV320AIC23) += snd-soc-tlv320aic23.o
obj-$(CONFIG_SND_SOC_TLV320AIC26) += snd-soc-tlv320aic26.o
obj-$(CONFIG_SND_SOC_TLV320AIC3X) += snd-soc-tlv320aic3x.o
diff --git a/sound/soc/codecs/tda998x.c b/sound/soc/codecs/tda998x.c
new file mode 100644
index 0000000..585cdb6
--- /dev/null
+++ b/sound/soc/codecs/tda998x.c
@@ -0,0 +1,237 @@
+/*
+ * ALSA SoC TDA998X driver
+ *
+ * This driver is used by the NXP TDA998x HDMI transmitter.
+ *
+ * Copyright (C) 2014 Jean-Francois Moine
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/pcm.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/i2c/tda998x.h>
+
+#define TDA998X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+struct tda_priv {
+ struct i2c_client *i2c_client;
+ struct snd_soc_codec *codec;
+ u8 ports[2];
+ int dai_id;
+ u8 *eld;
+};
+
+static void tda_get_encoder(struct tda_priv *priv)
+{
+ struct snd_soc_codec *codec = priv->codec;
+ struct device_node *np;
+ struct i2c_client *i2c_client;
+ static const struct of_device_id tda_dt[] = {
+ { .compatible = "nxp,tda998x" },
+ { },
+ };
+
+ /* search the tda998x device */
+ np = of_find_matching_node_and_match(NULL, tda_dt, NULL);
+ if (!np || !of_device_is_available(np)) {
+ dev_err(codec->dev, "No tda998x in DT\n");
+ return;
+ }
+ i2c_client = of_find_i2c_device_by_node(np);
+ of_node_put(np);
+ if (!i2c_client) {
+ dev_err(codec->dev, "no tda998x i2c client\n");
+ return;
+ }
+ if (!i2c_get_clientdata(i2c_client)) {
+ dev_err(codec->dev, "tda998x not initialized\n");
+ return;
+ }
+
+ priv->i2c_client = i2c_client;
+}
+
+static int tda_start_stop(struct tda_priv *priv)
+{
+ int port;
+
+ if (!priv->i2c_client) {
+ tda_get_encoder(priv);
+ if (!priv->i2c_client)
+ return -EINVAL;
+ }
+
+ /* give the audio parameters to the HDMI encoder */
+ if (priv->dai_id == AFMT_I2S)
+ port = priv->ports[0];
+ else
+ port = priv->ports[1];
+ tda998x_audio_update(priv->i2c_client, priv->dai_id, port);
+ return 0;
+}
+
+static int tda_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct tda_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
+
+ /* memorize the used DAI */
+ priv->dai_id = dai->id;
+
+ /* start the TDA998x audio */
+ return tda_start_stop(priv);
+}
+
+static void tda_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct tda_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
+
+ priv->dai_id = 0; /* streaming stop */
+ tda_start_stop(priv);
+}
+
+static const struct snd_soc_dai_ops tda_ops = {
+ .startup = tda_startup,
+ .shutdown = tda_shutdown,
+};
+
+static const struct snd_soc_dai_driver tda998x_dai[] = {
+ {
+ .name = "i2s-hifi",
+ .id = AFMT_I2S,
+ .playback = {
+ .stream_name = "HDMI I2S Playback",
+ .channels_min = 1,
+ .channels_max = 8,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 5512,
+ .rate_max = 192000,
+ .formats = TDA998X_FORMATS,
+
+ },
+ .ops = &tda_ops,
+ },
+ {
+ .name = "spdif-hifi",
+ .id = AFMT_SPDIF,
+ .playback = {
+ .stream_name = "HDMI SPDIF Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 22050,
+ .rate_max = 192000,
+ .formats = TDA998X_FORMATS,
+ },
+ .ops = &tda_ops,
+ },
+};
+
+static const struct snd_soc_dapm_widget tda_widgets[] = {
+ SND_SOC_DAPM_OUTPUT("hdmi-out"),
+};
+static const struct snd_soc_dapm_route tda_routes[] = {
+ { "hdmi-out", NULL, "HDMI I2S Playback" },
+ { "hdmi-out", NULL, "HDMI SPDIF Playback" },
+};
+
+static int tda_probe(struct snd_soc_codec *codec)
+{
+ struct tda_priv *priv;
+ struct device_node *np;
+ int i, j, ret;
+ const char *p;
+
+ priv = devm_kzalloc(codec->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ snd_soc_codec_set_drvdata(codec, priv);
+ priv->codec = codec;
+
+ /* get the audio input ports (I2s and S/PDIF) */
+ np = codec->dev->of_node;
+ for (i = 0; i < 2; i++) {
+ u32 port;
+
+ ret = of_property_read_u32_index(np, "audio-ports", i, &port);
+ if (ret) {
+ if (i == 0)
+ dev_err(codec->dev,
+ "bad or missing audio-ports\n");
+ break;
+ }
+ ret = of_property_read_string_index(np, "audio-port-names",
+ i, &p);
+ if (ret) {
+ dev_err(codec->dev,
+ "missing audio-port-names[%d]\n", i);
+ break;
+ }
+ if (strcmp(p, "i2s") == 0) {
+ j = 0;
+ } else if (strcmp(p, "spdif") == 0) {
+ j = 1;
+ } else {
+ dev_err(codec->dev,
+ "bad audio-port-names '%s'\n", p);
+ break;
+ }
+ priv->ports[j] = port;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_codec_driver soc_codec_tda998x = {
+ .probe = tda_probe,
+ .dapm_widgets = tda_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(tda_widgets),
+ .dapm_routes = tda_routes,
+ .num_dapm_routes = ARRAY_SIZE(tda_routes),
+};
+
+static int tda998x_dev_probe(struct platform_device *pdev)
+{
+ return snd_soc_register_codec(&pdev->dev,
+ &soc_codec_tda998x,
+ tda998x_dai, ARRAY_SIZE(tda998x_dai));
+}
+
+static int tda998x_dev_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_codec(&pdev->dev);
+ return 0;
+}
+
+static const struct of_device_id tda998x_codec_ids[] = {
+ { .compatible = "nxp,tda998x-codec", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tda998x_codec_ids);
+
+static struct platform_driver tda998x_driver = {
+ .probe = tda998x_dev_probe,
+ .remove = tda998x_dev_remove,
+ .driver = {
+ .name = "tda998x-codec",
+ .owner = THIS_MODULE,
+ .of_match_table = tda998x_codec_ids,
+ },
+};
+
+module_platform_driver(tda998x_driver);
+
+MODULE_AUTHOR("Jean-Francois Moine");
+MODULE_DESCRIPTION("TDA998x codec driver");
+MODULE_LICENSE("GPL");
--
1.9.rc1
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