Add an binary mixer 'ELD' to each HDMI PCM device so user space
could read the ELD data of external HDMI display.
Signed-off-by: Brent Lu <brent.lu@xxxxxxxxx>
---
sound/soc/codecs/hdac_hdmi.c | 138 +++++++++++++++++++++++++++++++++++
1 file changed, 138 insertions(+)
diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index f26b77faed59..869d1547ae5d 100644
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -9,6 +9,7 @@
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
+
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/module.h>
@@ -107,6 +108,7 @@ struct hdac_hdmi_pcm {
unsigned char chmap[8]; /* ALSA API channel-map */
struct mutex lock;
int jack_event;
+ struct snd_kcontrol *eld_ctl;
};
struct hdac_hdmi_dai_port_map {
@@ -1248,6 +1250,7 @@ static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin,
struct hdac_hdmi_pcm *pcm;
int size = 0;
int port_id = -1;
+ bool eld_valid, eld_changed;
if (!hdmi)
return;
@@ -1273,6 +1276,8 @@ static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin,
size = -EINVAL;
}
+ eld_valid = port->eld.eld_valid;
+
if (size > 0) {
port->eld.eld_valid = true;
port->eld.eld_size = size;
@@ -1281,6 +1286,8 @@ static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin,
port->eld.eld_size = 0;
}
+ eld_changed = (eld_valid != port->eld.eld_valid);
+
pcm = hdac_hdmi_get_pcm(hdev, port);
if (!port->eld.monitor_present || !port->eld.eld_valid) {
@@ -1313,6 +1320,12 @@ static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin,
}
mutex_unlock(&hdmi->pin_mutex);
+
+ if (eld_changed && pcm)
+ snd_ctl_notify(hdmi->card,
+ SNDRV_CTL_EVENT_MASK_VALUE |
+ SNDRV_CTL_EVENT_MASK_INFO,
+ &pcm->eld_ctl->id);
}
static int hdac_hdmi_add_ports(struct hdac_device *hdev,
@@ -1411,6 +1424,122 @@ static void hdac_hdmi_skl_enable_dp12(struct hdac_device *hdev)
}
+static int hdac_hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+ struct hdac_hdmi_priv *hdmi = snd_soc_component_get_drvdata(component);
+ struct hdac_hdmi_pcm *pcm;
+ struct hdac_hdmi_port *port;
+ struct hdac_hdmi_eld *eld;
+
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
+ uinfo->count = 0;
+
+ pcm = get_hdmi_pcm_from_id(hdmi, kcontrol->id.device);
+ if (!pcm) {
+ dev_dbg(component->dev, "%s: no pcm, device %d\n", __func__,
+ kcontrol->id.device);
+ return 0;
+ }
+
+ if (list_empty(&pcm->port_list)) {
+ dev_dbg(component->dev, "%s: empty port list, device %d\n",
+ __func__, kcontrol->id.device);
+ return 0;
+ }
+
+ mutex_lock(&hdmi->pin_mutex);
+
+ list_for_each_entry(port, &pcm->port_list, head) {
+ eld = &port->eld;
+
+ if (eld->eld_valid) {
+ uinfo->count = eld->eld_size;
+ break;
+ }
+ }
+
+ mutex_unlock(&hdmi->pin_mutex);
+
+ return 0;
+}
+
+static int hdac_hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+ struct hdac_hdmi_priv *hdmi = snd_soc_component_get_drvdata(component);
+ struct hdac_hdmi_pcm *pcm;
+ struct hdac_hdmi_port *port;
+ struct hdac_hdmi_eld *eld;
+
+ memset(ucontrol->value.bytes.data, 0, ARRAY_SIZE(ucontrol->value.bytes.data));
+
+ pcm = get_hdmi_pcm_from_id(hdmi, kcontrol->id.device);
+ if (!pcm) {
+ dev_dbg(component->dev, "%s: no pcm, device %d\n", __func__,
+ kcontrol->id.device);
+ return 0;
+ }
+
+ if (list_empty(&pcm->port_list)) {
+ dev_dbg(component->dev, "%s: empty port list, device %d\n",
+ __func__, kcontrol->id.device);
+ return 0;
+ }
+
+ mutex_lock(&hdmi->pin_mutex);
+
+ list_for_each_entry(port, &pcm->port_list, head) {
+ eld = &port->eld;
+
+ if (!eld->eld_valid)
+ continue;
+
+ if (eld->eld_size > ARRAY_SIZE(ucontrol->value.bytes.data) ||
+ eld->eld_size > ELD_MAX_SIZE) {
+ mutex_unlock(&hdmi->pin_mutex);
+
+ dev_err(component->dev, "%s: buffer too small, device %d eld_size %d\n",
+ __func__, kcontrol->id.device, eld->eld_size);
+ snd_BUG();
+ return -EINVAL;
+ }
+
+ memcpy(ucontrol->value.bytes.data, eld->eld_buffer,
+ eld->eld_size);
+ break;
+ }
+
+ mutex_unlock(&hdmi->pin_mutex);
+
+ return 0;
+}
+
+static int hdac_hdmi_create_eld_ctl(struct snd_soc_component *component, struct hdac_hdmi_pcm *pcm)
+{
+ struct snd_kcontrol *kctl;
+ struct snd_kcontrol_new hdmi_eld_ctl = {
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = "ELD",
+ .info = hdac_hdmi_eld_ctl_info,
+ .get = hdac_hdmi_eld_ctl_get,
+ .device = pcm->pcm_id,
+ };
+
+ /* add ELD ctl with the device number corresponding to the PCM stream */
+ kctl = snd_ctl_new1(&hdmi_eld_ctl, component);
+ if (!kctl)
+ return -ENOMEM;
+
+ pcm->eld_ctl = kctl;
+
+ return snd_ctl_add(component->card->snd_card, kctl);
+}
+
static const struct snd_soc_dai_ops hdmi_dai_ops = {
.startup = hdac_hdmi_pcm_open,
.shutdown = hdac_hdmi_pcm_close,
@@ -1784,6 +1913,15 @@ int hdac_hdmi_jack_init(struct snd_soc_dai *dai, int device,
}
}
+ /* add control for ELD Bytes */
+ err = hdac_hdmi_create_eld_ctl(component, pcm);
+ if (err < 0) {
+ dev_err(&hdev->dev,
+ "eld control add failed with err: %d for pcm: %d\n",
+ err, device);
+ return err;
+ }
+
list_add_tail(&pcm->head, &hdmi->pcm_list);
return 0;
--
2.17.1
