[PATCH 1/4] ASoC: hdmi-codec: Add an op to set callback function for plug event

[Cheng-Yi Chiang]

Add an op in hdmi_codec_ops so codec driver can register callback
function to handle plug event.

Driver in DRM can use this callback function to report connector status.

Signed-off-by: Cheng-Yi Chiang <cychi...@chromium.org>
---
 include/sound/hdmi-codec.h    | 16 +++++++++++
 sound/soc/codecs/hdmi-codec.c | 52 +++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
index 7fea496f1f34..26c02abb8eba 100644
--- a/include/sound/hdmi-codec.h
+++ b/include/sound/hdmi-codec.h
@@ -47,6 +47,9 @@ struct hdmi_codec_params {
        int channels;
 };
 
+typedef void (*hdmi_codec_plugged_cb)(struct platform_device *dev,
+                                     bool plugged);
+
 struct hdmi_codec_pdata;
 struct hdmi_codec_ops {
        /*
@@ -88,6 +91,13 @@ struct hdmi_codec_ops {
         */
        int (*get_dai_id)(struct snd_soc_component *comment,
                          struct device_node *endpoint);
+
+       /*
+        * Hook callback function to handle connector plug event.
+        * Optional
+        */
+       int (*hook_plugged_cb)(struct device *dev, void *data,
+                              hdmi_codec_plugged_cb fn);
 };
 
 /* HDMI codec initalization data */
@@ -99,6 +109,12 @@ struct hdmi_codec_pdata {
        void *data;
 };
 
+struct snd_soc_component;
+struct snd_soc_jack;
+
+int hdmi_codec_set_jack_detect(struct snd_soc_component *component,
+                              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 0bf1c8cad108..5e7075f78c38 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -7,6 +7,7 @@
 #include <linux/module.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>
@@ -274,6 +275,8 @@ struct hdmi_codec_priv {
        struct snd_pcm_chmap *chmap_info;
        unsigned int chmap_idx;
        struct mutex lock;
+       struct snd_soc_jack *jack;
+       unsigned int jack_status;
 };
 
 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
@@ -663,6 +666,55 @@ static int hdmi_dai_probe(struct snd_soc_dai *dai)
        return 0;
 }
 
+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 void plugged_cb(struct platform_device *pdev, bool plugged)
+{
+       struct platform_device *codec_pdev = platform_get_drvdata(pdev);
+       struct hdmi_codec_priv *hcp = platform_get_drvdata(codec_pdev);
+
+       if (plugged)
+               hdmi_codec_jack_report(hcp, SND_JACK_LINEOUT);
+       else
+               hdmi_codec_jack_report(hcp, 0);
+}
+
+/**
+ * hdmi_codec_set_jack_detect - register HDMI plugged callback
+ * @component: the hdmi-codec instance
+ * @jack: ASoC jack to report (dis)connection events on
+ */
+int hdmi_codec_set_jack_detect(struct snd_soc_component *component,
+                              struct snd_soc_jack *jack)
+{
+       struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
+       int ret;
+
+       if (hcp->hcd.ops->hook_plugged_cb) {
+               hcp->jack = jack;
+               ret = hcp->hcd.ops->hook_plugged_cb(component->dev->parent,
+                                                   hcp->hcd.data,
+                                                   plugged_cb);
+               if (ret) {
+                       hcp->jack = NULL;
+                       return ret;
+               }
+               return 0;
+       }
+       return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(hdmi_codec_set_jack_detect);
+
 static int hdmi_dai_spdif_probe(struct snd_soc_dai *dai)
 {
        struct hdmi_codec_daifmt *cf = dai->playback_dma_data;
-- 
2.22.0.410.gd8fdbe21b5-goog