[PATCH v5 2/7] ASoC: sunxi: Add a simple HDMI CODEC

Jean-Francois Moine
2016-10-21T07:44:55Z

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Allwinner's SoCs include support for both audio and video on HDMI.
This patch defines a simple audio CODEC which may be used in sunxi
HDMI video drivers.

Signed-off-by: Jean-Francois Moine <moinejf-GANU6spQydw@public.gmane.org>
---
include/sound/sunxi_hdmi.h | 23 +++++++++
sound/soc/codecs/Kconfig | 9 ++++
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/sunxi-hdmi.c | 106 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 140 insertions(+)
create mode 100644 include/sound/sunxi_hdmi.h
create mode 100644 sound/soc/codecs/sunxi-hdmi.c

diff --git a/include/sound/sunxi_hdmi.h b/include/sound/sunxi_hdmi.h
new file mode 100644
index 0000000..0986bb9
--- /dev/null
+++ b/include/sound/sunxi_hdmi.h
@@ -0,0 +1,23 @@
+#ifndef __SUNXI_HDMI_H__
+#define __SUNXI_HDMI_H__
+/*
+ * Copyright (C) 2016 Jean-François Moine
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+struct sunxi_hdmi_codec {
+ u8 *eld;
+ int (*set_audio_input)(struct device *dev,
+ int enable,
+ unsigned sample_rate,
+ unsigned sample_bit);
+};
+
+int sunxi_hdmi_codec_register(struct device *dev);
+void sunxi_hdmi_codec_unregister(struct device *dev);
+
+#endif /* __SUNXI_HDMI_H__ */
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index c67667b..53385b1 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -131,6 +131,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_STA529 if I2C
select SND_SOC_STAC9766 if SND_SOC_AC97_BUS
select SND_SOC_STI_SAS
+ select SND_SOC_SUNXI_HDMI
select SND_SOC_TAS2552 if I2C
select SND_SOC_TAS5086 if I2C
select SND_SOC_TAS571X if I2C
@@ -793,6 +794,14 @@ config SND_SOC_STAC9766
config SND_SOC_STI_SAS
tristate "codec Audio support for STI SAS codec"

+config SND_SOC_SUNXI_HDMI
+ tristate "Allwinner sunxi HDMI Support"
+ default m if DRM_SUNXI_DE2_HDMI=m
+ default y if DRM_SUNXI_DE2_HDMI=y
+ select SND_PCM_ELD
+ help
+ Enable HDMI audio output
+
config SND_SOC_TAS2552
tristate "Texas Instruments TAS2552 Mono Audio amplifier"
depends on I2C
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 958cd49..35804eb 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -139,6 +139,7 @@ snd-soc-sta350-objs := sta350.o
snd-soc-sta529-objs := sta529.o
snd-soc-stac9766-objs := stac9766.o
snd-soc-sti-sas-objs := sti-sas.o
+snd-soc-sunxi-hdmi-objs := sunxi-hdmi.o
snd-soc-tas5086-objs := tas5086.o
snd-soc-tas571x-objs := tas571x.o
snd-soc-tas5720-objs := tas5720.o
@@ -359,6 +360,7 @@ obj-$(CONFIG_SND_SOC_STA350) += snd-soc-sta350.o
obj-$(CONFIG_SND_SOC_STA529) += snd-soc-sta529.o
obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o
obj-$(CONFIG_SND_SOC_STI_SAS) += snd-soc-sti-sas.o
+obj-$(CONFIG_SND_SOC_SUNXI_HDMI) += snd-soc-sunxi-hdmi.o
obj-$(CONFIG_SND_SOC_TAS2552) += snd-soc-tas2552.o
obj-$(CONFIG_SND_SOC_TAS5086) += snd-soc-tas5086.o
obj-$(CONFIG_SND_SOC_TAS571X) += snd-soc-tas571x.o
diff --git a/sound/soc/codecs/sunxi-hdmi.c b/sound/soc/codecs/sunxi-hdmi.c
new file mode 100644
index 0000000..0d08676
--- /dev/null
+++ b/sound/soc/codecs/sunxi-hdmi.c
@@ -0,0 +1,106 @@
+/*
+ * Allwinner HDMI codec
+ *
+ * Copyright (C) 2016 Jean-Francois Moine <moinejf-GANU6spQydw@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <sound/pcm_drm_eld.h>
+#include <sound/pcm_params.h>
+
+#include "sound/sunxi_hdmi.h"
+
+#define SUNXI_HDMI_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
+ SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+static int sunxi_hdmi_codec_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sunxi_hdmi_codec *priv = dev_get_drvdata(dai->dev);
+ u8 *eld;
+
+ eld = priv->eld;
+ if (!eld)
+ return -ENODEV;
+
+ return snd_pcm_hw_constraint_eld(runtime, eld);
+}
+
+static int sunxi_hdmi_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct sunxi_hdmi_codec *priv = dev_get_drvdata(dai->dev);
+ unsigned sample_bit;
+
+ if (params_format(params) == SNDRV_PCM_FORMAT_S16_LE)
+ sample_bit = 16;
+ else
+ sample_bit = 24;
+
+ return priv->set_audio_input(dai->dev, true,
+ params_rate(params),
+ sample_bit);
+}
+
+static void sunxi_hdmi_codec_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct sunxi_hdmi_codec *priv = dev_get_drvdata(dai->dev);
+
+ priv->set_audio_input(dai->dev, false, 0, 0);
+}
+
+static const struct snd_soc_dai_ops sunxi_hdmi_codec_ops = {
+ .startup = sunxi_hdmi_codec_startup,
+ .hw_params = sunxi_hdmi_hw_params,
+ .shutdown = sunxi_hdmi_codec_shutdown,
+};
+
+static struct snd_soc_dai_driver sunxi_hdmi_codec = {
+ .name = "hdmi", /* must be the name of the node in the DT */
+ .playback = {
+ .stream_name = "HDMI Playback",
+ .channels_min = 1,
+ .channels_max = 8,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 8000,
+ .rate_max = 192000,
+ .formats = SUNXI_HDMI_FORMATS,
+ },
+ .ops = &sunxi_hdmi_codec_ops,
+};
+
+static const struct snd_soc_codec_driver sunxi_hdmi_codec_drv = {
+ .ignore_pmdown_time = true,
+};
+
+/* functions called from the HDMI video driver */
+int sunxi_hdmi_codec_register(struct device *dev)
+{
+ return snd_soc_register_codec(dev, &sunxi_hdmi_codec_drv,
+ &sunxi_hdmi_codec, 1);
+}
+EXPORT_SYMBOL_GPL(sunxi_hdmi_codec_register);
+
+void sunxi_hdmi_codec_unregister(struct device *dev)
+{
+ snd_soc_unregister_codec(dev);
+}
+EXPORT_SYMBOL_GPL(sunxi_hdmi_codec_unregister);
+
+MODULE_AUTHOR("Jean-Francois Moine <moinejf-GANU6spQydw@public.gmane.org>");
+MODULE_DESCRIPTION("Allwinner HDMI CODEC");
+MODULE_LICENSE("GPL");
--
2.10.1

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