[alsa-devel] [PATCH 3/4] ALSA: hda - Dispatch incoming HDMI hotplug i915 callback

[David Henningsson]

This lets interested codec(s) be notified of HDMI hotplug
events sent from the i915 driver.

Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
 include/sound/hdaudio.h |    4 ++++
 sound/hda/hdac_i915.c   |   23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 4caf1fd..8142d03 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -79,6 +79,10 @@ struct hdac_device {
 	int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
 			 unsigned int flags, unsigned int *res);
 
+	/* Used for hotplug notification from i915 driver */
+	void (*i915_hotplug_notify)(struct hdac_device *, int port,
+				    int port_mst_index);
+
 	/* widgets */
 	unsigned int num_nodes;
 	hda_nid_t start_nid, end_nid;
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index 5676b84..17295c2 100644
--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -118,6 +118,8 @@ static void hdac_component_master_unbind(struct device *dev)
 {
 	struct i915_audio_component *acomp = hdac_acomp;
 
+	acomp->audio_ops = NULL;
+	acomp->audio_ptr = NULL;
 	module_put(acomp->ops->owner);
 	component_unbind_all(dev, acomp);
 	WARN_ON(acomp->ops || acomp->dev);
@@ -128,6 +130,24 @@ static const struct component_master_ops hdac_component_master_ops = {
 	.unbind = hdac_component_master_unbind,
 };
 
+static void i915_audio_component_hotplug_notify(void *audio_ptr,
+						int port, int port_mst_index)
+{
+	struct hdac_device *d;
+	struct hdac_bus *bus = audio_ptr;
+
+	dev_dbg(bus->dev, "i915 hotplug event (port = %d:%d)",
+		port, port_mst_index);
+
+	list_for_each_entry(d, &bus->codec_list, list)
+		if (d->i915_hotplug_notify)
+			d->i915_hotplug_notify(d, port, port_mst_index);
+}
+
+static const struct i915_audio_component_audio_ops i915_audio_component_audio_ops = {
+	.hotplug_notify = i915_audio_component_hotplug_notify,
+};
+
 static int hdac_component_master_match(struct device *dev, void *data)
 {
 	/* i915 is the only supported component */
@@ -163,6 +183,9 @@ int snd_hdac_i915_init(struct hdac_bus *bus)
 		ret = -ENODEV;
 		goto out_master_del;
 	}
+	acomp->audio_ops = &i915_audio_component_audio_ops;
+	acomp->audio_ptr = bus;
+
 	dev_dbg(dev, "bound to i915 component master\n");
 
 	return 0;
-- 
1.7.9.5