[PATCH v6 2/6] ASoC: hdmi-codec: Add hdmi-codec for external HDMI-encoders
Arnaud Pouliquen
arnaud.pouliquen at st.com
Wed Mar 9 10:17:00 UTC 2016
Hello Jyri,
Tested with success on sti platform
Acked-by: Arnaud Pouliquen <arnaud.pouliquen at st.com>
Regards
Arnaud
On 03/08/2016 09:14 PM, Jyri Sarha wrote:
> The hdmi-codec is a platform device driver to be registered from
> drivers of external HDMI encoders with I2S and/or spdif interface. The
> driver in turn registers an ASoC codec for the HDMI encoder's audio
> functionality.
>
> The structures and definitions in the API header are mostly redundant
> copies of similar structures in ASoC headers. This is on purpose to
> avoid direct dependencies to ASoC structures in video side driver.
>
> Signed-off-by: Jyri Sarha <jsarha at ti.com>
> ---
> include/sound/hdmi-codec.h | 100 +++++++++++
> sound/soc/codecs/Kconfig | 6 +
> sound/soc/codecs/Makefile | 2 +
> sound/soc/codecs/hdmi-codec.c | 393 ++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 501 insertions(+)
> create mode 100644 include/sound/hdmi-codec.h
> create mode 100644 sound/soc/codecs/hdmi-codec.c
>
> diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
> new file mode 100644
> index 0000000..fc3a481
> --- /dev/null
> +++ b/include/sound/hdmi-codec.h
> @@ -0,0 +1,100 @@
> +/*
> + * hdmi-codec.h - HDMI Codec driver API
> + *
> + * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
> + *
> + * Author: Jyri Sarha <jsarha at ti.com>
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + */
> +
> +#ifndef __HDMI_CODEC_H__
> +#define __HDMI_CODEC_H__
> +
> +#include <linux/hdmi.h>
> +#include <drm/drm_edid.h>
> +#include <sound/asoundef.h>
> +#include <uapi/sound/asound.h>
> +
> +/*
> + * Protocol between ASoC cpu-dai and HDMI-encoder
> + */
> +struct hdmi_codec_daifmt {
> + enum {
> + HDMI_I2S,
> + HDMI_RIGHT_J,
> + HDMI_LEFT_J,
> + HDMI_DSP_A,
> + HDMI_DSP_B,
> + HDMI_AC97,
> + HDMI_SPDIF,
> + } fmt;
> + int bit_clk_inv:1;
> + int frame_clk_inv:1;
> + int bit_clk_master:1;
> + int frame_clk_master:1;
> +};
> +
> +/*
> + * HDMI audio parameters
> + */
> +struct hdmi_codec_params {
> + struct hdmi_audio_infoframe cea;
> + struct snd_aes_iec958 iec;
> + int sample_rate;
> + int sample_width;
> + int channels;
> +};
> +
> +struct hdmi_codec_ops {
> + /*
> + * Called when ASoC starts an audio stream setup.
> + * Optional
> + */
> + int (*audio_startup)(struct device *dev);
> +
> + /*
> + * Configures HDMI-encoder for audio stream.
> + * Mandatory
> + */
> + int (*hw_params)(struct device *dev,
> + struct hdmi_codec_daifmt *fmt,
> + struct hdmi_codec_params *hparms);
> +
> + /*
> + * Shuts down the audio stream.
> + * Mandatory
> + */
> + void (*audio_shutdown)(struct device *dev);
> +
> + /*
> + * Mute/unmute HDMI audio stream.
> + * Optional
> + */
> + int (*digital_mute)(struct device *dev, bool enable);
> +
> + /*
> + * Provides EDID-Like-Data from connected HDMI device.
> + * Optional
> + */
> + int (*get_eld)(struct device *dev, uint8_t *buf, size_t len);
> +};
> +
> +/* HDMI codec initalization data */
> +struct hdmi_codec_pdata {
> + const struct hdmi_codec_ops *ops;
> + uint i2s:1;
> + uint spdif:1;
> + int max_i2s_channels;
> +};
> +
> +#define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
> +
> +#endif /* __HDMI_CODEC_H__ */
> diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> index 50693c8..62b62fe 100644
> --- a/sound/soc/codecs/Kconfig
> +++ b/sound/soc/codecs/Kconfig
> @@ -86,6 +86,7 @@ config SND_SOC_ALL_CODECS
> select SND_SOC_MC13783 if MFD_MC13XXX
> select SND_SOC_ML26124 if I2C
> select SND_SOC_NAU8825 if I2C
> + select SND_SOC_HDMI_CODEC
> select SND_SOC_PCM1681 if I2C
> select SND_SOC_PCM179X if SPI_MASTER
> select SND_SOC_PCM3008
> @@ -473,6 +474,11 @@ config SND_SOC_BT_SCO
> config SND_SOC_DMIC
> tristate
>
> +config SND_SOC_HDMI_CODEC
> + tristate
> + select SND_PCM_ELD
> + select SND_PCM_IEC958
> +
> config SND_SOC_ES8328
> tristate "Everest Semi ES8328 CODEC"
>
> diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
> index d44f7d3..5f7b002 100644
> --- a/sound/soc/codecs/Makefile
> +++ b/sound/soc/codecs/Makefile
> @@ -79,6 +79,7 @@ snd-soc-max9850-objs := max9850.o
> snd-soc-mc13783-objs := mc13783.o
> snd-soc-ml26124-objs := ml26124.o
> snd-soc-nau8825-objs := nau8825.o
> +snd-soc-hdmi-codec-objs := hdmi-codec.o
> snd-soc-pcm1681-objs := pcm1681.o
> snd-soc-pcm179x-codec-objs := pcm179x.o
> snd-soc-pcm3008-objs := pcm3008.o
> @@ -283,6 +284,7 @@ obj-$(CONFIG_SND_SOC_MAX9850) += snd-soc-max9850.o
> obj-$(CONFIG_SND_SOC_MC13783) += snd-soc-mc13783.o
> obj-$(CONFIG_SND_SOC_ML26124) += snd-soc-ml26124.o
> obj-$(CONFIG_SND_SOC_NAU8825) += snd-soc-nau8825.o
> +obj-$(CONFIG_SND_SOC_HDMI_CODEC) += snd-soc-hdmi-codec.o
> obj-$(CONFIG_SND_SOC_PCM1681) += snd-soc-pcm1681.o
> obj-$(CONFIG_SND_SOC_PCM179X) += snd-soc-pcm179x-codec.o
> obj-$(CONFIG_SND_SOC_PCM3008) += snd-soc-pcm3008.o
> diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
> new file mode 100644
> index 0000000..bc47b9a
> --- /dev/null
> +++ b/sound/soc/codecs/hdmi-codec.c
> @@ -0,0 +1,393 @@
> +/*
> + * ALSA SoC codec for HDMI encoder drivers
> + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
> + * Author: Jyri Sarha <jsarha at ti.com>
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + */
> +#include <linux/module.h>
> +#include <linux/string.h>
> +#include <sound/core.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +#include <sound/pcm_drm_eld.h>
> +#include <sound/hdmi-codec.h>
> +#include <sound/pcm_iec958.h>
> +
> +#include <drm/drm_crtc.h> /* This is only to get MAX_ELD_BYTES */
> +
> +struct hdmi_codec_priv {
> + struct hdmi_codec_pdata hcd;
> + struct snd_soc_dai_driver *daidrv;
> + struct hdmi_codec_daifmt daifmt[2];
> + struct mutex current_stream_lock;
> + struct snd_pcm_substream *current_stream;
> + struct snd_pcm_hw_constraint_list ratec;
> + uint8_t eld[MAX_ELD_BYTES];
> +};
> +
> +static const struct snd_soc_dapm_widget hdmi_widgets[] = {
> + SND_SOC_DAPM_OUTPUT("TX"),
> +};
> +
> +static const struct snd_soc_dapm_route hdmi_routes[] = {
> + { "TX", NULL, "Playback" },
> +};
> +
> +enum {
> + DAI_ID_I2S = 0,
> + DAI_ID_SPDIF,
> +};
> +
> +static int hdmi_codec_new_stream(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> + int ret = 0;
> +
> + mutex_lock(&hcp->current_stream_lock);
> + if (!hcp->current_stream) {
> + hcp->current_stream = substream;
> + } else if (hcp->current_stream != substream) {
> + dev_err(dai->dev, "Only one simultaneous stream supported!\n");
> + ret = -EINVAL;
> + }
> + mutex_unlock(&hcp->current_stream_lock);
> +
> + return ret;
> +}
> +
> +static int hdmi_codec_startup(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> + int ret = 0;
> +
> + dev_dbg(dai->dev, "%s()\n", __func__);
> +
> + ret = hdmi_codec_new_stream(substream, dai);
> + if (ret)
> + return ret;
> +
> + if (hcp->hcd.ops->audio_startup) {
> + ret = hcp->hcd.ops->audio_startup(dai->dev->parent);
> + if (ret) {
> + mutex_lock(&hcp->current_stream_lock);
> + hcp->current_stream = NULL;
> + mutex_unlock(&hcp->current_stream_lock);
> + return ret;
> + }
> + }
> +
> + if (hcp->hcd.ops->get_eld) {
> + ret = hcp->hcd.ops->get_eld(dai->dev->parent, hcp->eld,
> + sizeof(hcp->eld));
> +
> + if (!ret) {
> + ret = snd_pcm_hw_constraint_eld(substream->runtime,
> + hcp->eld);
> + if (ret)
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> +static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> +
> + dev_dbg(dai->dev, "%s()\n", __func__);
> +
> + WARN_ON(hcp->current_stream != substream);
> +
> + hcp->hcd.ops->audio_shutdown(dai->dev->parent);
> +
> + mutex_lock(&hcp->current_stream_lock);
> + hcp->current_stream = NULL;
> + mutex_unlock(&hcp->current_stream_lock);
> +}
> +
> +static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
> + struct snd_pcm_hw_params *params,
> + struct snd_soc_dai *dai)
> +{
> + struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> + struct hdmi_codec_params hp = {
> + .iec = {
> + .status = { 0 },
> + .subcode = { 0 },
> + .pad = 0,
> + .dig_subframe = { 0 },
> + }
> + };
> + int ret;
> +
> + dev_dbg(dai->dev, "%s() width %d rate %d channels %d\n", __func__,
> + params_width(params), params_rate(params),
> + params_channels(params));
> +
> + ret = snd_pcm_create_iec958_consumer_hw_params(params, hp.iec.status,
> + sizeof(hp.iec.status));
> + if (ret < 0) {
> + dev_err(dai->dev, "Creating IEC958 channel status failed %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = hdmi_codec_new_stream(substream, dai);
> + if (ret)
> + return ret;
> +
> + hdmi_audio_infoframe_init(&hp.cea);
> + hp.cea.channels = params_channels(params);
> + hp.cea.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
> + hp.cea.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
> + hp.cea.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
> +
> + hp.sample_width = params_width(params);
> + hp.sample_rate = params_rate(params);
> + hp.channels = params_channels(params);
> +
> + return hcp->hcd.ops->hw_params(dai->dev->parent, &hcp->daifmt[dai->id],
> + &hp);
> +}
> +
> +static int hdmi_codec_set_fmt(struct snd_soc_dai *dai,
> + unsigned int fmt)
> +{
> + struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> + struct hdmi_codec_daifmt cf = { 0 };
> + int ret = 0;
> +
> + dev_dbg(dai->dev, "%s()\n", __func__);
> +
> + if (dai->id == DAI_ID_SPDIF) {
> + cf.fmt = HDMI_SPDIF;
> + } else {
> + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
> + case SND_SOC_DAIFMT_CBM_CFM:
> + cf.bit_clk_master = 1;
> + cf.frame_clk_master = 1;
> + break;
> + case SND_SOC_DAIFMT_CBS_CFM:
> + cf.frame_clk_master = 1;
> + break;
> + case SND_SOC_DAIFMT_CBM_CFS:
> + cf.bit_clk_master = 1;
> + break;
> + case SND_SOC_DAIFMT_CBS_CFS:
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
> + case SND_SOC_DAIFMT_NB_NF:
> + break;
> + case SND_SOC_DAIFMT_NB_IF:
> + cf.frame_clk_inv = 1;
> + break;
> + case SND_SOC_DAIFMT_IB_NF:
> + cf.bit_clk_inv = 1;
> + break;
> + case SND_SOC_DAIFMT_IB_IF:
> + cf.frame_clk_inv = 1;
> + cf.bit_clk_inv = 1;
> + break;
> + }
> +
> + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
> + case SND_SOC_DAIFMT_I2S:
> + cf.fmt = HDMI_I2S;
> + break;
> + case SND_SOC_DAIFMT_DSP_A:
> + cf.fmt = HDMI_DSP_A;
> + break;
> + case SND_SOC_DAIFMT_DSP_B:
> + cf.fmt = HDMI_DSP_B;
> + break;
> + case SND_SOC_DAIFMT_RIGHT_J:
> + cf.fmt = HDMI_RIGHT_J;
> + break;
> + case SND_SOC_DAIFMT_LEFT_J:
> + cf.fmt = HDMI_LEFT_J;
> + break;
> + case SND_SOC_DAIFMT_AC97:
> + cf.fmt = HDMI_AC97;
> + break;
> + default:
> + dev_err(dai->dev, "Invalid DAI interface format\n");
> + return -EINVAL;
> + }
> + }
> +
> + hcp->daifmt[dai->id] = cf;
> +
> + return ret;
> +}
> +
> +static int hdmi_codec_digital_mute(struct snd_soc_dai *dai, int mute)
> +{
> + struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
> +
> + dev_dbg(dai->dev, "%s()\n", __func__);
> +
> + if (hcp->hcd.ops->digital_mute)
> + return hcp->hcd.ops->digital_mute(dai->dev->parent, mute);
> +
> + return 0;
> +}
> +
> +static const struct snd_soc_dai_ops hdmi_dai_ops = {
> + .startup = hdmi_codec_startup,
> + .shutdown = hdmi_codec_shutdown,
> + .hw_params = hdmi_codec_hw_params,
> + .set_fmt = hdmi_codec_set_fmt,
> + .digital_mute = hdmi_codec_digital_mute,
> +};
> +
> +
> +#define HDMI_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
> + SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
> + SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |\
> + SNDRV_PCM_RATE_192000)
> +
> +#define SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
> + SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
> + SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
> + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
> +
> +/*
> + * This list is only for formats allowed on the I2S bus. So there is
> + * some formats listed that are not supported by HDMI interface. For
> + * instance allowing the 32-bit formats enables 24-precision with CPU
> + * DAIs that do not support 24-bit formats. If the extra formats cause
> + * problems, we should add the video side driver an option to disable
> + * them.
> + */
> +#define I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
> + SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
> + SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
> + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\
> + SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE)
> +
> +static struct snd_soc_dai_driver hdmi_i2s_dai = {
> + .name = "i2s-hifi",
> + .id = DAI_ID_I2S,
> + .playback = {
> + .stream_name = "Playback",
> + .channels_min = 2,
> + .channels_max = 8,
> + .rates = HDMI_RATES,
> + .formats = I2S_FORMATS,
> + .sig_bits = 24,
> + },
> + .ops = &hdmi_dai_ops,
> +};
> +
> +static const struct snd_soc_dai_driver hdmi_spdif_dai = {
> + .name = "spdif-hifi",
> + .id = DAI_ID_SPDIF,
> + .playback = {
> + .stream_name = "Playback",
> + .channels_min = 2,
> + .channels_max = 2,
> + .rates = HDMI_RATES,
> + .formats = SPDIF_FORMATS,
> + },
> + .ops = &hdmi_dai_ops,
> +};
> +
> +static struct snd_soc_codec_driver hdmi_codec = {
> + .dapm_widgets = hdmi_widgets,
> + .num_dapm_widgets = ARRAY_SIZE(hdmi_widgets),
> + .dapm_routes = hdmi_routes,
> + .num_dapm_routes = ARRAY_SIZE(hdmi_routes),
> +};
> +
> +static int hdmi_codec_probe(struct platform_device *pdev)
> +{
> + struct hdmi_codec_pdata *hcd = pdev->dev.platform_data;
> + struct device *dev = &pdev->dev;
> + struct hdmi_codec_priv *hcp;
> + int dai_count, i = 0;
> + int ret;
> +
> + dev_dbg(dev, "%s()\n", __func__);
> +
> + if (!hcd) {
> + dev_err(dev, "%s: No plalform data\n", __func__);
> + return -EINVAL;
> + }
> +
> + dai_count = hcd->i2s + hcd->spdif;
> + if (dai_count < 1 || !hcd->ops || !hcd->ops->hw_params ||
> + !hcd->ops->audio_shutdown) {
> + dev_err(dev, "%s: Invalid parameters\n", __func__);
> + return -EINVAL;
> + }
> +
> + hcp = devm_kzalloc(dev, sizeof(*hcp), GFP_KERNEL);
> + if (!hcp)
> + return -ENOMEM;
> +
> + hcp->hcd = *hcd;
> + mutex_init(&hcp->current_stream_lock);
> +
> + hcp->daidrv = devm_kzalloc(dev, dai_count * sizeof(*hcp->daidrv),
> + GFP_KERNEL);
> + if (!hcp->daidrv)
> + return -ENOMEM;
> +
> + if (hcd->i2s) {
> + hcp->daidrv[i] = hdmi_i2s_dai;
> + hcp->daidrv[i].playback.channels_max =
> + hcd->max_i2s_channels;
> + i++;
> + }
> +
> + if (hcd->spdif)
> + hcp->daidrv[i] = hdmi_spdif_dai;
> +
> + ret = snd_soc_register_codec(dev, &hdmi_codec, hcp->daidrv,
> + dai_count);
> + if (ret) {
> + dev_err(dev, "%s: snd_soc_register_codec() failed (%d)\n",
> + __func__, ret);
> + return ret;
> + }
> +
> + dev_set_drvdata(dev, hcp);
> + return 0;
> +}
> +
> +static int hdmi_codec_remove(struct platform_device *pdev)
> +{
> + snd_soc_unregister_codec(&pdev->dev);
> + return 0;
> +}
> +
> +static struct platform_driver hdmi_codec_driver = {
> + .driver = {
> + .name = HDMI_CODEC_DRV_NAME,
> + },
> + .probe = hdmi_codec_probe,
> + .remove = hdmi_codec_remove,
> +};
> +
> +module_platform_driver(hdmi_codec_driver);
> +
> +MODULE_AUTHOR("Jyri Sarha <jsarha at ti.com>");
> +MODULE_DESCRIPTION("HDMI Audio Codec Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" HDMI_CODEC_DRV_NAME);
>
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