ASoC: hdmi-codec: Add hdmi-codec for external HDMI-encoders (09184118) · Commits · 戴 / test

include/sound/hdmi-codec.h

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		/*
		* hdmi-codec.h - HDMI Codec driver API
		*
		* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
		*
		* Author: Jyri Sarha <jsarha@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__ */

sound/soc/codecs/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -88,6 +88,7 @@ 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_I2C if I2C
		select SND_SOC_PCM179X_SPI if SPI_MASTER
		@@ -477,6 +478,11 @@ 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"

sound/soc/codecs/Makefile

+2 −0

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		@@ -81,6 +81,7 @@ 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-pcm179x-i2c-objs := pcm179x-i2c.o
		@@ -290,6 +291,7 @@ 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_PCM179X_I2C) += snd-soc-pcm179x-i2c.o

sound/soc/codecs/hdmi-codec.c

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		/*
		* ALSA SoC codec for HDMI encoder drivers
		* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
		* Author: Jyri Sarha <jsarha@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));

		if (params_width(params) > 24)
		params->msbits = 24;

		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@ti.com>");
		MODULE_DESCRIPTION("HDMI Audio Codec Driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:" HDMI_CODEC_DRV_NAME);

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