ALSA: hda - Add reboot notifier to each codec

Add reboot notifier to each codec so that it can do some workarounds
needed for reboot.

So far, patch_sigmatel.c calls its shutup routine for avoiding noises
at reboot on some HP machines.

References: Novell bnc#544779
	http://bugzilla.novell.com/show_bug.cgi?id=544779

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

sound/pci/hda/hda_codec.c

@@ -3404,6 +3404,23 @@ static void cleanup_dig_out_stream(struct hda_codec *codec, hda_nid_t nid)
 	}
 }
 
+/* call each reboot notifier */
+void snd_hda_bus_reboot_notify(struct hda_bus *bus)
+{
+	struct hda_codec *codec;
+
+	if (!bus)
+		return;
+	list_for_each_entry(codec, &bus->codec_list, list) {
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+		if (!codec->power_on)
+			continue;
+#endif
+		if (codec->patch_ops.reboot_notify)
+			codec->patch_ops.reboot_notify(codec);
+	}
+}
+
 /*
  * open the digital out in the exclusive mode
  */

sound/pci/hda/hda_codec.h

@@ -674,6 +674,7 @@ struct hda_codec_ops {
 #ifdef CONFIG_SND_HDA_POWER_SAVE
 	int (*check_power_status)(struct hda_codec *codec, hda_nid_t nid);
 #endif
+	void (*reboot_notify)(struct hda_codec *codec);
 };
 
 /* record for amp information cache */
@@ -910,6 +911,7 @@ int snd_hda_is_supported_format(struct hda_codec *codec, hda_nid_t nid,
  * Misc
  */
 void snd_hda_get_codec_name(struct hda_codec *codec, char *name, int namelen);
+void snd_hda_bus_reboot_notify(struct hda_bus *bus);
 
 /*
  * power management

sound/pci/hda/hda_intel.c

@@ -2150,6 +2150,7 @@ static int azx_resume(struct pci_dev *pci)
 static int azx_halt(struct notifier_block *nb, unsigned long event, void *buf)
 {
 	struct azx *chip = container_of(nb, struct azx, reboot_notifier);
+	snd_hda_bus_reboot_notify(chip->bus);
 	azx_stop_chip(chip);
 	return NOTIFY_OK;
 }

sound/pci/hda/patch_sigmatel.c

@@ -4831,6 +4831,7 @@ static struct hda_codec_ops stac92xx_patch_ops = {
 	.suspend = stac92xx_suspend,
 	.resume = stac92xx_resume,
 #endif
+	.reboot_notify = stac92xx_shutup,
 };
 
 static int patch_stac9200(struct hda_codec *codec)