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, 24 insertions, 2 deletions

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 9cd2545d988e..ba640d36d648 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -30,7 +30,6 @@
 #include <sound/core.h>
 #include "hda_codec.h"
 #include "hda_local.h"
-#include "hda_patch.h"
 
 #define ALC880_FRONT_EVENT		0x01
 #define ALC880_DCVOL_EVENT		0x02
@@ -16579,7 +16578,7 @@ static int patch_alc662(struct hda_codec *codec)
 /*
  * patch entries
  */
-struct hda_codec_preset snd_hda_preset_realtek[] = {
+static struct hda_codec_preset snd_hda_preset_realtek[] = {
 	{ .id = 0x10ec0260, .name = "ALC260", .patch = patch_alc260 },
 	{ .id = 0x10ec0262, .name = "ALC262", .patch = patch_alc262 },
 	{ .id = 0x10ec0267, .name = "ALC267", .patch = patch_alc268 },
@@ -16611,3 +16610,26 @@ struct hda_codec_preset snd_hda_preset_realtek[] = {
 	{ .id = 0x10ec0889, .name = "ALC889", .patch = patch_alc883 },
 	{} /* terminator */
 };
+
+MODULE_ALIAS("snd-hda-codec-id:10ec*");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Realtek HD-audio codec");
+
+static struct hda_codec_preset_list realtek_list = {
+	.preset = snd_hda_preset_realtek,
+	.owner = THIS_MODULE,
+};
+
+static int __init patch_realtek_init(void)
+{
+	return snd_hda_add_codec_preset(&realtek_list);
+}
+
+static void __exit patch_realtek_exit(void)
+{
+	snd_hda_delete_codec_preset(&realtek_list);
+}
+
+module_init(patch_realtek_init)
+module_exit(patch_realtek_exit)