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_analog.c b/sound/pci/hda/patch_analog.c
index 0cc6be12b8b..c1918a1a6df 100644
--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -27,7 +27,6 @@
 #include <sound/core.h>
 #include "hda_codec.h"
 #include "hda_local.h"
-#include "hda_patch.h"
 
 struct ad198x_spec {
 	struct snd_kcontrol_new *mixers[5];
@@ -4308,7 +4307,7 @@ static int patch_ad1882(struct hda_codec *codec)
 /*
  * patch entries
  */
-struct hda_codec_preset snd_hda_preset_analog[] = {
+static struct hda_codec_preset snd_hda_preset_analog[] = {
 	{ .id = 0x11d4184a, .name = "AD1884A", .patch = patch_ad1884a },
 	{ .id = 0x11d41882, .name = "AD1882", .patch = patch_ad1882 },
 	{ .id = 0x11d41883, .name = "AD1883", .patch = patch_ad1884a },
@@ -4326,3 +4325,26 @@ struct hda_codec_preset snd_hda_preset_analog[] = {
 	{ .id = 0x11d4989b, .name = "AD1989B", .patch = patch_ad1988 },
 	{} /* terminator */
 };
+
+MODULE_ALIAS("snd-hda-codec-id:11d4*");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Analog Devices HD-audio codec");
+
+static struct hda_codec_preset_list analog_list = {
+	.preset = snd_hda_preset_analog,
+	.owner = THIS_MODULE,
+};
+
+static int __init patch_analog_init(void)
+{
+	return snd_hda_add_codec_preset(&analog_list);
+}
+
+static void __exit patch_analog_exit(void)
+{
+	snd_hda_delete_codec_preset(&analog_list);
+}
+
+module_init(patch_analog_init)
+module_exit(patch_analog_exit)