ALSA: hda - Modularize HD-audio driver

Split the monolithc HD-audio driver into several pieces:
 - snd-hda-intel   HD-audio PCI controller driver; loaded via udev
 - snd-hda-codec   HD-audio codec bus driver
 - snd-hda-codec-* Specific HD-audio codec drivers

When built as modules, snd-hda-codec (that is invoked by snd-hda-intel)
looks up the codec vendor ID and loads the corresponding codec module
automatically via request_module().

When built in a kernel, each codec drivers are statically hooked up
before probing the PCI.

This patch adds appropriate EXPORT_SYMBOL_GPL()'s and the module
information for each driver, and driver-linking codes between
codec-bus and codec drivers.

TODO:
  - Avoid EXPORT_SYMBOL*() when built-in kernel
  - Restore __devinit appropriately depending on the condition

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 29 insertions, 2 deletions

diff --git a/sound/pci/hda/patch_atihdmi.c b/sound/pci/hda/patch_atihdmi.c
index 5603a1acddb1..5887b827bb32 100644
--- a/sound/pci/hda/patch_atihdmi.c
+++ b/sound/pci/hda/patch_atihdmi.c
@@ -27,7 +27,6 @@
 #include <sound/core.h>
 #include "hda_codec.h"
 #include "hda_local.h"
-#include "hda_patch.h"
 
 struct atihdmi_spec {
         struct hda_multi_out multiout;
@@ -187,7 +186,7 @@ static int patch_atihdmi(struct hda_codec *codec)
 /*
  * patch entries
  */
-struct hda_codec_preset snd_hda_preset_atihdmi[] = {
+static struct hda_codec_preset snd_hda_preset_atihdmi[] = {
         { .id = 0x1002793c, .name = "ATI RS600 HDMI", .patch = patch_atihdmi },
         { .id = 0x10027919, .name = "ATI RS600 HDMI", .patch = patch_atihdmi },
         { .id = 0x1002791a, .name = "ATI RS690/780 HDMI", .patch = patch_atihdmi },
@@ -196,3 +195,31 @@ struct hda_codec_preset snd_hda_preset_atihdmi[] = {
         { .id = 0x17e80047, .name = "Chrontel HDMI",  .patch = patch_atihdmi },
         {} /* terminator */
 };
+
+MODULE_ALIAS("snd-hda-codec-id:1002793c");
+MODULE_ALIAS("snd-hda-codec-id:10027919");
+MODULE_ALIAS("snd-hda-codec-id:1002791a");
+MODULE_ALIAS("snd-hda-codec-id:1002aa01");
+MODULE_ALIAS("snd-hda-codec-id:10951390");
+MODULE_ALIAS("snd-hda-codec-id:17e80047");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ATI HDMI HD-audio codec");
+
+static struct hda_codec_preset_list atihdmi_list = {
+        .preset = snd_hda_preset_atihdmi,
+        .owner = THIS_MODULE,
+};
+
+static int __init patch_atihdmi_init(void)
+{
+        return snd_hda_add_codec_preset(&atihdmi_list);
+}
+
+static void __exit patch_atihdmi_exit(void)
+{
+        snd_hda_delete_codec_preset(&atihdmi_list);
+}
+
+module_init(patch_atihdmi_init)
+module_exit(patch_atihdmi_exit)