[alsa-devel] [RFC v3 6/7] ASoC: hdmi-codec: Use HDMI notifications to add jack support

[Philipp Zabel]

Use HDMI connection / disconnection notifications to update an ALSA
jack object. Also make a copy of the ELD block after every change.

Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
Changes since v2:
 - Don't call get_eld, copy the ELD contained in the notification instead.
---
 include/sound/hdmi-codec.h    |  6 ++++
 sound/soc/codecs/hdmi-codec.c | 69 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
index 15fe70f..8b6219d 100644
--- a/include/sound/hdmi-codec.h
+++ b/include/sound/hdmi-codec.h
@@ -99,6 +99,12 @@ struct hdmi_codec_pdata {
 	int max_i2s_channels;
 };
 
+struct snd_soc_codec;
+struct snd_soc_jack;
+
+int hdmi_codec_set_jack_detect(struct snd_soc_codec *codec,
+			       struct snd_soc_jack *jack);
+
 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 
 #endif /* __HDMI_CODEC_H__ */
diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index 687332d..6b327e2 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -12,9 +12,12 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
  * General Public License for more details.
  */
+#include <linux/hdmi-not.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 #include <linux/string.h>
 #include <sound/core.h>
+#include <sound/jack.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -27,11 +30,15 @@
 struct hdmi_codec_priv {
 	struct hdmi_codec_pdata hcd;
 	struct snd_soc_dai_driver *daidrv;
+	struct snd_soc_jack *jack;
 	struct hdmi_codec_daifmt daifmt[2];
 	struct mutex current_stream_lock;
 	struct snd_pcm_substream *current_stream;
 	struct snd_pcm_hw_constraint_list ratec;
 	uint8_t eld[MAX_ELD_BYTES];
+	struct device *dev;
+	struct notifier_block nb;
+	unsigned int jack_status;
 };
 
 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
@@ -326,6 +333,60 @@ static struct snd_soc_codec_driver hdmi_codec = {
 	.num_dapm_routes = ARRAY_SIZE(hdmi_routes),
 };
 
+static void hdmi_codec_jack_report(struct hdmi_codec_priv *hcp,
+				   unsigned int jack_status)
+{
+	if (!hcp->jack)
+		return;
+
+	if (jack_status != hcp->jack_status) {
+		snd_soc_jack_report(hcp->jack, jack_status, SND_JACK_LINEOUT);
+		hcp->jack_status = jack_status;
+	}
+}
+
+static int hdmi_codec_notify(struct notifier_block *nb, unsigned long event,
+			     void *data)
+{
+	struct hdmi_codec_priv *hcp = container_of(nb, struct hdmi_codec_priv,
+						   nb);
+	union hdmi_event *event_block = data;
+
+	if (hcp->dev->parent != event_block->base.source)
+		return NOTIFY_OK;
+
+	if (!hcp->jack)
+		return NOTIFY_OK;
+
+	switch (event) {
+	case HDMI_CONNECTED:
+		hdmi_codec_jack_report(hcp, SND_JACK_LINEOUT);
+		break;
+	case HDMI_DISCONNECTED:
+		hdmi_codec_jack_report(hcp, 0);
+		break;
+	case HDMI_NEW_ELD:
+		memcpy(hcp->eld, event_block->eld.eld, sizeof(hcp->eld));
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+int hdmi_codec_set_jack_detect(struct snd_soc_codec *codec,
+			       struct snd_soc_jack *jack)
+{
+	struct hdmi_codec_priv *hcp = snd_soc_codec_get_drvdata(codec);
+
+	hcp->jack = jack;
+	hcp->nb.notifier_call = hdmi_codec_notify;
+
+	hdmi_register_notifier(&hcp->nb);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hdmi_codec_set_jack_detect);
+
 static int hdmi_codec_probe(struct platform_device *pdev)
 {
 	struct hdmi_codec_pdata *hcd = pdev->dev.platform_data;
@@ -370,6 +431,8 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 	if (hcd->spdif)
 		hcp->daidrv[i] = hdmi_spdif_dai;
 
+	dev_set_drvdata(dev, hcp);
+
 	ret = snd_soc_register_codec(dev, &hdmi_codec, hcp->daidrv,
 				     dai_count);
 	if (ret) {
@@ -378,12 +441,16 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	dev_set_drvdata(dev, hcp);
+	hcp->dev = dev;
+
 	return 0;
 }
 
 static int hdmi_codec_remove(struct platform_device *pdev)
 {
+	struct hdmi_codec_priv *hcp = platform_get_drvdata(pdev);
+
+	hdmi_unregister_notifier(&hcp->nb);
 	snd_soc_unregister_codec(&pdev->dev);
 	return 0;
 }
-- 
2.6.4