[RFC v3 7/7] ASoC: hdmi-codec: Add ELD control
Jyri Sarha
jsarha at ti.com
Tue Jan 19 04:00:05 PST 2016
On 01/12/16 17:38, Philipp Zabel wrote:
> Exporting the ELD bytes to userspace allows an application to select
> an appropriate audio format depending on the current capabilities of
> the connected HDMI sink device.
>
This looks good, but I was unable to test it. Obviously amixer or
alsamixer is unable to show anything about an ELD mixer element, but
shouldn't there be something about it shown under /proc/asound/card0/,
or am I mistaken.
Cheers,
Jyri
> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
> ---
> sound/soc/codecs/hdmi-codec.c | 36 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 36 insertions(+)
>
> diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
> index 6b327e2..6cb7217 100644
> --- a/sound/soc/codecs/hdmi-codec.c
> +++ b/sound/soc/codecs/hdmi-codec.c
> @@ -54,6 +54,40 @@ 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);
> +
> + memcpy(ucontrol->value.bytes.data, hcp->eld, sizeof(hcp->eld));
> +
> + 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 void hdmi_codec_abort(struct device *dev)
> {
> struct hdmi_codec_priv *hcp = dev_get_drvdata(dev);
> @@ -327,6 +361,8 @@ 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,
>
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