[PATCH 2/3] ASoC: hdmi-codec: Add event handler for hdmi TX

[Jiaxin Yu <jiaxin.yu@mediatek.com>]

If the speaker and hdmi are connect to the same port of I2S,
when try to switch to speaker playback, we will find that hdmi
is always turned on automatically. The way of switching is
through SOC_DAPM_PIN_SWITCH, however, such events can not be
handled in hdmi-codec driver.

So add event handler for hdmi TX to solve the above issue.

Signed-off-by: Jiaxin Yu <jiaxin.yu@mediatek.com>
---
 include/sound/hdmi-codec.h    |  6 ++++++
 sound/soc/codecs/hdmi-codec.c | 37 +++++++++++++++++++++++++++++++----
 2 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
index 48ad33aba393..dcbc09254144 100644
--- a/include/sound/hdmi-codec.h
+++ b/include/sound/hdmi-codec.h
@@ -81,6 +81,12 @@ struct hdmi_codec_ops {
 		       struct hdmi_codec_daifmt *fmt,
 		       struct hdmi_codec_params *hparms);
 
+	/*
+	 * PCM trigger callback.
+	 * Mandatory
+	 */
+	int (*trigger)(struct device *dev, int cmd);
+
 	/*
 	 * Shuts down the audio stream.
 	 * Mandatory
diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index 0b1cdb2d6049..cb4479372e09 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -276,7 +276,31 @@ struct hdmi_codec_priv {
 	u8 iec_status[AES_IEC958_STATUS_SIZE];
 };
 
+static int hdmi_tx_event(struct snd_soc_dapm_widget *w,
+		struct snd_kcontrol *kcontrol, int event)
+{
+	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
+	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		if (hcp->hcd.ops->trigger)
+			hcp->hcd.ops->trigger(component->dev->parent, SNDRV_PCM_TRIGGER_START);
+		break;
+	case SND_SOC_DAPM_POST_PMD:
+		if (hcp->hcd.ops->trigger)
+			hcp->hcd.ops->trigger(component->dev->parent, SNDRV_PCM_TRIGGER_STOP);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
+	SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0, hdmi_tx_event,
+			       SND_SOC_DAPM_POST_PMD | SND_SOC_DAPM_PRE_PMU),
 	SND_SOC_DAPM_OUTPUT("TX"),
 	SND_SOC_DAPM_OUTPUT("RX"),
 };
@@ -808,18 +832,23 @@ static int hdmi_dai_probe(struct snd_soc_dai *dai)
 	struct hdmi_codec_daifmt *daifmt;
 	struct snd_soc_dapm_route route[] = {
 		{
-			.sink = "TX",
+			.sink = dai->driver->capture.stream_name,
+			.source = "RX",
+		},
+		{
+			.sink = "SDB",
 			.source = dai->driver->playback.stream_name,
 		},
 		{
-			.sink = dai->driver->capture.stream_name,
-			.source = "RX",
+			.sink = "TX",
+			.source = "SDB",
 		},
+
 	};
 	int ret;
 
 	dapm = snd_soc_component_get_dapm(dai->component);
-	ret = snd_soc_dapm_add_routes(dapm, route, 2);
+	ret = snd_soc_dapm_add_routes(dapm, route, ARRAY_SIZE(route));
 	if (ret)
 		return ret;
 
-- 
2.18.0