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

[Jean-Francois Moine <moinejf-GANU6spQydw@public.gmane.org>]

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

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html