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ASoC: fsl: Add imx-hdmi machine driver
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The driver is initially designed for sound card using HDMI
interface on i.MX platform. There is internal HDMI IP or
external HDMI modules connect with SAI or AUD2HTX interface.
It supports both transmitter and receiver devices.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/1607251319-5821-2-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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@TE-N-ShengjiuWang @broonie
TE-N-ShengjiuWang authored and broonie committed Dec 8, 2020
1 parent e344cf5 commit 6a5f850
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12 changes: 12 additions & 0 deletions sound/soc/fsl/Kconfig
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Expand Up @@ -305,6 +305,18 @@ config SND_SOC_IMX_AUDMIX
Say Y if you want to add support for SoC audio on an i.MX board with
an Audio Mixer.

config SND_SOC_IMX_HDMI
tristate "SoC Audio support for i.MX boards with HDMI port"
select SND_SOC_FSL_SAI
select SND_SOC_FSL_AUD2HTX
select SND_SOC_HDMI_CODEC
help
ALSA SoC Audio support with HDMI feature for Freescale SoCs that have
SAI/AUD2HTX and connect with internal HDMI IP or external module
SII902X.
Say Y if you want to add support for SoC audio on an i.MX board with
IMX HDMI.

endif # SND_IMX_SOC

endmenu
2 changes: 2 additions & 0 deletions sound/soc/fsl/Makefile
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Expand Up @@ -65,9 +65,11 @@ snd-soc-imx-es8328-objs := imx-es8328.o
snd-soc-imx-sgtl5000-objs := imx-sgtl5000.o
snd-soc-imx-spdif-objs := imx-spdif.o
snd-soc-imx-audmix-objs := imx-audmix.o
snd-soc-imx-hdmi-objs := imx-hdmi.o

obj-$(CONFIG_SND_SOC_EUKREA_TLV320) += snd-soc-eukrea-tlv320.o
obj-$(CONFIG_SND_SOC_IMX_ES8328) += snd-soc-imx-es8328.o
obj-$(CONFIG_SND_SOC_IMX_SGTL5000) += snd-soc-imx-sgtl5000.o
obj-$(CONFIG_SND_SOC_IMX_SPDIF) += snd-soc-imx-spdif.o
obj-$(CONFIG_SND_SOC_IMX_AUDMIX) += snd-soc-imx-audmix.o
obj-$(CONFIG_SND_SOC_IMX_HDMI) += snd-soc-imx-hdmi.o
236 changes: 236 additions & 0 deletions sound/soc/fsl/imx-hdmi.c
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@@ -0,0 +1,236 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright 2017-2020 NXP

#include <linux/module.h>
#include <linux/of_platform.h>
#include <sound/jack.h>
#include <sound/pcm_params.h>
#include <sound/hdmi-codec.h>
#include "fsl_sai.h"

/**
* struct cpu_priv - CPU private data
* @sysclk_freq: SYSCLK rates for set_sysclk()
* @sysclk_dir: SYSCLK directions for set_sysclk()
* @sysclk_id: SYSCLK ids for set_sysclk()
* @slot_width: Slot width of each frame
*
* Note: [1] for tx and [0] for rx
*/
struct cpu_priv {
unsigned long sysclk_freq[2];
u32 sysclk_dir[2];
u32 sysclk_id[2];
u32 slot_width;
};

struct imx_hdmi_data {
struct snd_soc_dai_link dai;
struct snd_soc_card card;
struct snd_soc_jack hdmi_jack;
struct snd_soc_jack_pin hdmi_jack_pin;
struct cpu_priv cpu_priv;
u32 dai_fmt;
};

static int imx_hdmi_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_hdmi_data *data = snd_soc_card_get_drvdata(rtd->card);
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
struct snd_soc_card *card = rtd->card;
struct device *dev = card->dev;
u32 slot_width = data->cpu_priv.slot_width;
int ret;

/* MCLK always is (256 or 192) * rate. */
ret = snd_soc_dai_set_sysclk(cpu_dai, data->cpu_priv.sysclk_id[tx],
8 * slot_width * params_rate(params),
tx ? SND_SOC_CLOCK_OUT : SND_SOC_CLOCK_IN);
if (ret && ret != -ENOTSUPP) {
dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
return ret;
}

ret = snd_soc_dai_set_tdm_slot(cpu_dai, 0, 0, 2, slot_width);
if (ret && ret != -ENOTSUPP) {
dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
return ret;
}

return 0;
}

static struct snd_soc_ops imx_hdmi_ops = {
.hw_params = imx_hdmi_hw_params,
};

static const struct snd_soc_dapm_widget imx_hdmi_widgets[] = {
SND_SOC_DAPM_LINE("HDMI Jack", NULL),
};

static int imx_hdmi_init(struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_card *card = rtd->card;
struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
struct snd_soc_component *component = codec_dai->component;
struct imx_hdmi_data *data = snd_soc_card_get_drvdata(card);
int ret;

data->hdmi_jack_pin.pin = "HDMI Jack";
data->hdmi_jack_pin.mask = SND_JACK_LINEOUT;
/* enable jack detection */
ret = snd_soc_card_jack_new(card, "HDMI Jack", SND_JACK_LINEOUT,
&data->hdmi_jack, &data->hdmi_jack_pin, 1);
if (ret) {
dev_err(card->dev, "Can't new HDMI Jack %d\n", ret);
return ret;
}

ret = snd_soc_component_set_jack(component, &data->hdmi_jack, NULL);
if (ret && ret != -EOPNOTSUPP) {
dev_err(card->dev, "Can't set HDMI Jack %d\n", ret);
return ret;
}

return 0;
};

static int imx_hdmi_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
bool hdmi_out = of_property_read_bool(np, "hdmi-out");
bool hdmi_in = of_property_read_bool(np, "hdmi-in");
struct snd_soc_dai_link_component *dlc;
struct platform_device *cpu_pdev;
struct device_node *cpu_np;
struct imx_hdmi_data *data;
int ret;

dlc = devm_kzalloc(&pdev->dev, 3 * sizeof(*dlc), GFP_KERNEL);
if (!dlc)
return -ENOMEM;

cpu_np = of_parse_phandle(np, "audio-cpu", 0);
if (!cpu_np) {
dev_err(&pdev->dev, "cpu dai phandle missing or invalid\n");
ret = -EINVAL;
goto fail;
}

cpu_pdev = of_find_device_by_node(cpu_np);
if (!cpu_pdev) {
dev_err(&pdev->dev, "failed to find SAI platform device\n");
ret = -EINVAL;
goto fail;
}

data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto fail;
}

data->dai.cpus = &dlc[0];
data->dai.num_cpus = 1;
data->dai.platforms = &dlc[1];
data->dai.num_platforms = 1;
data->dai.codecs = &dlc[2];
data->dai.num_codecs = 1;

data->dai.name = "i.MX HDMI";
data->dai.stream_name = "i.MX HDMI";
data->dai.cpus->dai_name = dev_name(&cpu_pdev->dev);
data->dai.platforms->of_node = cpu_np;
data->dai.ops = &imx_hdmi_ops;
data->dai.playback_only = true;
data->dai.capture_only = false;
data->dai.init = imx_hdmi_init;

if (of_node_name_eq(cpu_np, "sai")) {
data->cpu_priv.sysclk_id[1] = FSL_SAI_CLK_MAST1;
data->cpu_priv.sysclk_id[0] = FSL_SAI_CLK_MAST1;
}

if (of_device_is_compatible(np, "fsl,imx-audio-sii902x")) {
data->dai_fmt = SND_SOC_DAIFMT_LEFT_J;
data->cpu_priv.slot_width = 24;
} else {
data->dai_fmt = SND_SOC_DAIFMT_I2S;
data->cpu_priv.slot_width = 32;
}

if ((hdmi_out && hdmi_in) || (!hdmi_out && !hdmi_in)) {
dev_err(&pdev->dev, "Invalid HDMI DAI link\n");
goto fail;
}

if (hdmi_out) {
data->dai.playback_only = true;
data->dai.capture_only = false;
data->dai.codecs->dai_name = "i2s-hifi";
data->dai.codecs->name = "hdmi-audio-codec.1";
data->dai.dai_fmt = data->dai_fmt |
SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS;
}

if (hdmi_in) {
data->dai.playback_only = false;
data->dai.capture_only = true;
data->dai.codecs->dai_name = "i2s-hifi";
data->dai.codecs->name = "hdmi-audio-codec.2";
data->dai.dai_fmt = data->dai_fmt |
SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBM_CFM;
}

data->card.dapm_widgets = imx_hdmi_widgets;
data->card.num_dapm_widgets = ARRAY_SIZE(imx_hdmi_widgets);
data->card.dev = &pdev->dev;
data->card.owner = THIS_MODULE;
ret = snd_soc_of_parse_card_name(&data->card, "model");
if (ret)
goto fail;

data->card.num_links = 1;
data->card.dai_link = &data->dai;

snd_soc_card_set_drvdata(&data->card, data);
ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
if (ret) {
dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
goto fail;
}

fail:
if (cpu_np)
of_node_put(cpu_np);

return ret;
}

static const struct of_device_id imx_hdmi_dt_ids[] = {
{ .compatible = "fsl,imx-audio-hdmi", },
{ .compatible = "fsl,imx-audio-sii902x", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_hdmi_dt_ids);

static struct platform_driver imx_hdmi_driver = {
.driver = {
.name = "imx-hdmi",
.owner = THIS_MODULE,
.pm = &snd_soc_pm_ops,
.of_match_table = imx_hdmi_dt_ids,
},
.probe = imx_hdmi_probe,
};
module_platform_driver(imx_hdmi_driver);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Freescale i.MX hdmi audio ASoC machine driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:imx-hdmi");

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