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, 25 insertions, 2 deletions

diff --git a/sound/pci/hda/patch_nvhdmi.c b/sound/pci/hda/patch_nvhdmi.c
index 1360d54a7d01..e23de5594b6e 100644
--- a/sound/pci/hda/patch_nvhdmi.c
+++ b/sound/pci/hda/patch_nvhdmi.c
@@ -28,7 +28,6 @@
 #include <sound/core.h>
 #include "hda_codec.h"
 #include "hda_local.h"
-#include "hda_patch.h"
 
 struct nvhdmi_spec {
         struct hda_multi_out multiout;
@@ -159,8 +158,32 @@ static int patch_nvhdmi(struct hda_codec *codec)
 /*
  * patch entries
  */
-struct hda_codec_preset snd_hda_preset_nvhdmi[] = {
+static struct hda_codec_preset snd_hda_preset_nvhdmi[] = {
         { .id = 0x10de0002, .name = "NVIDIA MCP78 HDMI", .patch = patch_nvhdmi },
         { .id = 0x10de0007, .name = "NVIDIA MCP7A HDMI", .patch = patch_nvhdmi },
         {} /* terminator */
 };
+
+MODULE_ALIAS("snd-hda-codec-id:10de0002");
+MODULE_ALIAS("snd-hda-codec-id:10de0007");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Nvidia HDMI HD-audio codec");
+
+static struct hda_codec_preset_list nvhdmi_list = {
+        .preset = snd_hda_preset_nvhdmi,
+        .owner = THIS_MODULE,
+};
+
+static int __init patch_nvhdmi_init(void)
+{
+        return snd_hda_add_codec_preset(&nvhdmi_list);
+}
+
+static void __exit patch_nvhdmi_exit(void)
+{
+        snd_hda_delete_codec_preset(&nvhdmi_list);
+}
+
+module_init(patch_nvhdmi_init)
+module_exit(patch_nvhdmi_exit)