[alsa-devel] Applied "ASoC: hdmi-codec: Add ELD control" to the asoc tree

[Mark Brown]

The patch

   ASoC: hdmi-codec: Add ELD control

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 81151cfb6bfe69f1c5a52b795eb005226a322c9e Mon Sep 17 00:00:00 2001
From: Philipp Zabel <p.zabel at pengutronix.de>
Date: Wed, 20 Apr 2016 10:59:58 +0200
Subject: [PATCH] ASoC: hdmi-codec: Add ELD control

ALSA doesn't know about all the different compressed audio formats,
so there is no interface to let userspace enumerate the formats that
are supported by the connected sink. Exporting the raw ELD bytes to
userspace allows an application to select the appropriate audio format
depending on the current capabilities of the connected HDMI sink device.
Usually userspace then just pretends to ALSA that the data is in one of
the raw 16-bit PCM audio formats and relies on the IEC controls to tell
the sink how to interpret the data.

Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
Reviewed-by: Jyri Sarha <jsarha at ti.com>
Tested-by: Jyri Sarha <jsarha at ti.com>
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/codecs/hdmi-codec.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index b46b8edb9319..c78333b4311d 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -47,6 +47,42 @@ enum {
 	DAI_ID_SPDIF,
 };
 
+static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_info *uinfo)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
+	uinfo->count = sizeof(hcp->eld);
+
+	return 0;
+}
+
+static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
+
+	mutex_lock(&hcp->eld_lock);
+	memcpy(ucontrol->value.bytes.data, hcp->eld, sizeof(hcp->eld));
+	mutex_unlock(&hcp->eld_lock);
+
+	return 0;
+}
+
+static const struct snd_kcontrol_new hdmi_controls[] = {
+	{
+		.access = SNDRV_CTL_ELEM_ACCESS_READ |
+			  SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "ELD",
+		.info = hdmi_eld_ctl_info,
+		.get = hdmi_eld_ctl_get,
+	},
+};
+
 static int hdmi_codec_new_stream(struct snd_pcm_substream *substream,
 				 struct snd_soc_dai *dai)
 {
@@ -312,6 +348,8 @@ static const struct snd_soc_dai_driver hdmi_spdif_dai = {
 };
 
 static struct snd_soc_codec_driver hdmi_codec = {
+	.controls = hdmi_controls,
+	.num_controls = ARRAY_SIZE(hdmi_controls),
 	.dapm_widgets = hdmi_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(hdmi_widgets),
 	.dapm_routes = hdmi_routes,
-- 
2.8.0.rc3