audio: add driver registry

Add registry for audio drivers, using the existing audio_driver struct.
Make all drivers register themself.  The old list of audio_driver struct
pointers is now a list of audio driver names, specifying the priority
(aka probe order) in case no driver is explicitly asked for.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20180306074053.22856-2-kraxel@redhat.com

1 files changed, 7 insertions, 1 deletions

diff --git a/audio/spiceaudio.c b/audio/spiceaudio.c
index 5580e76307..6ad0eafbc6 100644
--- a/audio/spiceaudio.c
+++ b/audio/spiceaudio.c
@@ -391,7 +391,7 @@ static struct audio_pcm_ops audio_callbacks = {
     .ctl_in   = line_in_ctl,
 };
 
-struct audio_driver spice_audio_driver = {
+static struct audio_driver spice_audio_driver = {
     .name           = "spice",
     .descr          = "spice audio driver",
     .options        = audio_options,
@@ -411,3 +411,9 @@ void qemu_spice_audio_init (void)
 {
     spice_audio_driver.can_be_default = 1;
 }
+
+static void register_audio_spice(void)
+{
+    audio_driver_register(&spice_audio_driver);
+}
+type_init(register_audio_spice);