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    Subject[PATCH v3 2/5] ASoC: tda998x: add a codec driver for the TDA998x
    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 start/stop audio streaming.

    This driver is DT only and it is loaded from its DT description as
    a subnode in the TDA998x node.

    Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
    ---
    drivers/gpu/drm/i2c/tda998x_drv.c | 4 +
    sound/soc/codecs/Kconfig | 6 ++
    sound/soc/codecs/Makefile | 2 +
    sound/soc/codecs/tda998x.c | 216 ++++++++++++++++++++++++++++++++++++++
    4 files changed, 228 insertions(+)
    create mode 100644 sound/soc/codecs/tda998x.c

    diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
    index 2643be4..68f0b7b 100644
    --- a/drivers/gpu/drm/i2c/tda998x_drv.c
    +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
    @@ -20,6 +20,7 @@
    #include <linux/hdmi.h>
    #include <linux/module.h>
    #include <linux/irq.h>
    +#include <linux/of_platform.h>
    #include <sound/asoundef.h>

    #include <drm/drmP.h>
    @@ -1387,6 +1388,9 @@ tda998x_encoder_init(struct i2c_client *client,
    priv->vip_cntrl_2 = video;
    }

    + /* load the optional CODEC */
    + of_platform_populate(np, NULL, NULL, &client->dev);
    +
    return 0;

    fail:
    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..34d7086
    --- /dev/null
    +++ b/sound/soc/codecs/tda998x.c
    @@ -0,0 +1,216 @@
    +/*
    + * 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 int tda_get_encoder(struct tda_priv *priv)
    +{
    + struct snd_soc_codec *codec = priv->codec;
    + struct device_node *np;
    +
    + /* get the parent tda998x device */
    + np = of_get_parent(codec->dev->of_node);
    + if (!np || !of_device_is_compatible(np, "nxp,tda998x")) {
    + dev_err(codec->dev, "no or bad parent!\n");
    + return -EINVAL;
    + }
    + priv->i2c_client = of_find_i2c_device_by_node(np);
    + of_node_put(np);
    + return 0;
    +}
    +
    +static int tda_start_stop(struct tda_priv *priv)
    +{
    + int port;
    +
    + /* 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 = codec->dev->of_node;
    + 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) */
    + 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;
    + }
    +
    + /* get the tda998x device */
    + return tda_get_encoder(priv);
    +}
    +
    +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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