ALSA: ac97: Add VT1613 AC97 codec support

Patch to add an VT1613 AC97 codec support.

This codec has additional DC offset removal control,
headphone output and no video input.

Signed-off-by: Maciej Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ac97/ac97_codec.c

@@ -177,6 +177,7 @@ static const struct ac97_codec_id snd_ac97_codec_ids[] = {
 { 0x54524123, 0xffffffff, "TR28602",		NULL,		NULL }, // only guess --jk [TR28023 = eMicro EM28023 (new CT1297)]
 { 0x54584e03, 0xffffffff, "TLV320AIC27",	NULL,		NULL },
 { 0x54584e20, 0xffffffff, "TLC320AD9xC",	NULL,		NULL },
+{ 0x56494120, 0xfffffff0, "VIA1613",		patch_vt1613,	NULL },
 { 0x56494161, 0xffffffff, "VIA1612A",		NULL,		NULL }, // modified ICE1232 with S/PDIF
 { 0x56494170, 0xffffffff, "VIA1617A",		patch_vt1617a,	NULL }, // modified VT1616 with S/PDIF
 { 0x56494182, 0xffffffff, "VIA1618",		patch_vt1618,   NULL },

sound/pci/ac97/ac97_patch.c

@@ -3351,6 +3351,39 @@ static int patch_cm9780(struct snd_ac97 *ac97)
 	return 0;
 }
 
+/*
+ * VIA VT1613 codec
+ */
+static const struct snd_kcontrol_new snd_ac97_controls_vt1613[] = {
+AC97_SINGLE("DC Offset removal", 0x5a, 10, 1, 0),
+};
+
+static int patch_vt1613_specific(struct snd_ac97 *ac97)
+{
+	int err;
+
+	err = patch_build_controls(ac97, &snd_ac97_controls_vt1613[0],
+				ARRAY_SIZE(snd_ac97_controls_vt1613));
+	if (err)
+		return err;
+
+	return 0;
+};
+
+static const struct snd_ac97_build_ops patch_vt1613_ops = {
+	.build_specific	= patch_vt1613_specific
+};
+
+static int patch_vt1613(struct snd_ac97 *ac97)
+{
+	ac97->build_ops = &patch_vt1613_ops;
+
+	ac97->flags |= AC97_HAS_NO_VIDEO;
+	ac97->caps |= AC97_BC_HEADPHONE;
+
+	return 0;
+}
+
 /*
  * VIA VT1616 codec
  */