[alsa-devel] [PATCH 1/6] ASoC: hdmi-codec: add PCM trigger operator

[Tzung-Bi Shih]

HDMI codec may be also interested in PCM triggers.  Add PCM trigger
operator.

Signed-off-by: Tzung-Bi Shih <tzungbi at google.com>
---
 include/sound/hdmi-codec.h    | 13 +++++++++++++
 sound/soc/codecs/hdmi-codec.c | 31 +++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
index 83b17682e01c..9de462ef170d 100644
--- a/include/sound/hdmi-codec.h
+++ b/include/sound/hdmi-codec.h
@@ -50,6 +50,13 @@ struct hdmi_codec_params {
 typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
 				      bool plugged);
 
+enum {
+	HDMI_CODEC_TRIGGER_EVENT_STOP,
+	HDMI_CODEC_TRIGGER_EVENT_START,
+	HDMI_CODEC_TRIGGER_EVENT_SUSPEND,
+	HDMI_CODEC_TRIGGER_EVENT_RESUME,
+};
+
 struct hdmi_codec_pdata;
 struct hdmi_codec_ops {
 	/*
@@ -66,6 +73,12 @@ struct hdmi_codec_ops {
 			 struct hdmi_codec_daifmt *fmt,
 			 struct hdmi_codec_params *hparms);
 
+	/*
+	 * PCM trigger callback.
+	 * Optional
+	 */
+	int (*trigger)(struct device *dev, int event);
+
 	/*
 	 * Shuts down the audio stream.
 	 * Mandatory
diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index b5fd8f08726e..1ba2fa26ba03 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -565,12 +565,42 @@ static int hdmi_codec_digital_mute(struct snd_soc_dai *dai, int mute)
 	return 0;
 }
 
+static int hdmi_codec_trigger(struct snd_pcm_substream *substream, int cmd,
+			      struct snd_soc_dai *dai)
+{
+	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
+	int event;
+
+	if (!hcp->hcd.ops->trigger)
+		return 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_STOP:
+		event = HDMI_CODEC_TRIGGER_EVENT_STOP;
+		break;
+	case SNDRV_PCM_TRIGGER_START:
+		event = HDMI_CODEC_TRIGGER_EVENT_START;
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		event = HDMI_CODEC_TRIGGER_EVENT_SUSPEND;
+		break;
+	case SNDRV_PCM_TRIGGER_RESUME:
+		event = HDMI_CODEC_TRIGGER_EVENT_RESUME;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return hcp->hcd.ops->trigger(dai->dev->parent, event);
+}
+
 static const struct snd_soc_dai_ops hdmi_codec_i2s_dai_ops = {
 	.startup	= hdmi_codec_startup,
 	.shutdown	= hdmi_codec_shutdown,
 	.hw_params	= hdmi_codec_hw_params,
 	.set_fmt	= hdmi_codec_i2s_set_fmt,
 	.digital_mute	= hdmi_codec_digital_mute,
+	.trigger	= hdmi_codec_trigger,
 };
 
 static const struct snd_soc_dai_ops hdmi_codec_spdif_dai_ops = {
@@ -578,6 +608,7 @@ static const struct snd_soc_dai_ops hdmi_codec_spdif_dai_ops = {
 	.shutdown	= hdmi_codec_shutdown,
 	.hw_params	= hdmi_codec_hw_params,
 	.digital_mute	= hdmi_codec_digital_mute,
+	.trigger	= hdmi_codec_trigger,
 };
 
 #define HDMI_RATES	(SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
-- 
2.23.0.866.gb869b98d4c-goog