Re: [PATCH RFC v5 2/8] ASoC: hdmi-codec: Add hdmi-codec for external HDMI-encoders

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Hello Jyri,

Integrated and tested on sti platform with success.

I will re-submit patch-set associated to sti platform, when (if) patches
accepted.

Regards
Arnaud

On 02/17/2016 03:49 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@xxxxxx>
> ---
>  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@xxxxxx>
> + *
> + * 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 cfdafc4..4d5915e 100644
> --- a/sound/soc/codecs/Kconfig
> +++ b/sound/soc/codecs/Kconfig
> @@ -82,6 +82,7 @@ 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_PCM1792A if SPI_MASTER
>  	select SND_SOC_PCM3008
> @@ -454,6 +455,11 @@ 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 f632fc4..49c1824 100644
> --- a/sound/soc/codecs/Makefile
> +++ b/sound/soc/codecs/Makefile
> @@ -75,6 +75,7 @@ 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-pcm1792a-codec-objs := pcm1792a.o
>  snd-soc-pcm3008-objs := pcm3008.o
> @@ -270,6 +271,7 @@ 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-$(CONFIG_SND_SOC_PCM1792A)	+= snd-soc-pcm1792a-codec.o
>  obj-$(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@xxxxxx>
> + *
> + * 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@xxxxxx>");
> +MODULE_DESCRIPTION("HDMI Audio Codec Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" HDMI_CODEC_DRV_NAME);
> 
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