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_via.c b/sound/pci/hda/patch_via.c
index 05182be1c9f0..6e4d01d1d502 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -47,7 +47,6 @@
 #include <sound/asoundef.h>
 #include "hda_codec.h"
 #include "hda_local.h"
-#include "hda_patch.h"
 
 /* amp values */
 #define AMP_VAL_IDX_SHIFT       19
@@ -3249,7 +3248,7 @@ static int patch_vt1702(struct hda_codec *codec)
 /*
  * patch entries
  */
-struct hda_codec_preset snd_hda_preset_via[] = {
+static struct hda_codec_preset snd_hda_preset_via[] = {
         { .id = 0x11061708, .name = "VIA VT1708", .patch = patch_vt1708},
         { .id = 0x11061709, .name = "VIA VT1708", .patch = patch_vt1708},
         { .id = 0x1106170A, .name = "VIA VT1708", .patch = patch_vt1708},
@@ -3320,3 +3319,26 @@ struct hda_codec_preset snd_hda_preset_via[] = {
           .patch = patch_vt1702},
         {} /* terminator */
 };
+
+MODULE_ALIAS("snd-hda-codec-id:1106*");
+
+static struct hda_codec_preset_list via_list = {
+        .preset = snd_hda_preset_via,
+        .owner = THIS_MODULE,
+};
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("VIA HD-audio codec");
+
+static int __init patch_via_init(void)
+{
+        return snd_hda_add_codec_preset(&via_list);
+}
+
+static void __exit patch_via_exit(void)
+{
+        snd_hda_delete_codec_preset(&via_list);
+}
+
+module_init(patch_via_init)
+module_exit(patch_via_exit)