From a215d6b0766d7377d29d4087103370f5951803b2 Mon Sep 17 00:00:00 2001
From: Daniel Jacobowitz <dan@codesourcery.com>
Date: Wed, 7 May 2008 12:05:10 +0200
Subject: [PATCH] --- yaml --- r: 99021 b: refs/heads/master c:
 87af38dafe4f930921b9217c21ec6d72cad56bcc h: refs/heads/master i:   99019:
 84c2d8faf55785e942e05745192ef3cef1137ab1 v: v3

---
 [refs]                            |  2 +-
 trunk/sound/drivers/Kconfig       |  1 +
 trunk/sound/pci/ac97/ac97_patch.c | 76 +++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 5ae79e223f98..179171386b8e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1894c59fdb63692f5ba2576875cc558b856935ca
+refs/heads/master: 87af38dafe4f930921b9217c21ec6d72cad56bcc
diff --git a/trunk/sound/drivers/Kconfig b/trunk/sound/drivers/Kconfig
index 602b58e3b55d..159137bf4c11 100644
--- a/trunk/sound/drivers/Kconfig
+++ b/trunk/sound/drivers/Kconfig
@@ -58,6 +58,7 @@ config SND_AC97_CODEC
 	tristate
 	select SND_PCM
 	select AC97_BUS
+	select SND_VMASTER
 
 config SND_DUMMY
 	tristate "Dummy (/dev/null) soundcard"
diff --git a/trunk/sound/pci/ac97/ac97_patch.c b/trunk/sound/pci/ac97/ac97_patch.c
index 1292dcee072d..92817f7d46d2 100644
--- a/trunk/sound/pci/ac97/ac97_patch.c
+++ b/trunk/sound/pci/ac97/ac97_patch.c
@@ -3352,8 +3352,66 @@ AC97_SINGLE("Downmix LFE and Center to Front", 0x5a, 12, 1, 0),
 AC97_SINGLE("Downmix Surround to Front", 0x5a, 11, 1, 0),
 };
 
+static const char *slave_vols_vt1616[] = {
+	"Front Playback Volume",
+	"Surround Playback Volume",
+	"Center Playback Volume",
+	"LFE Playback Volume",
+	NULL
+};
+
+static const char *slave_sws_vt1616[] = {
+	"Front Playback Switch",
+	"Surround Playback Switch",
+	"Center Playback Switch",
+	"LFE Playback Switch",
+	NULL
+};
+
+/* find a mixer control element with the given name */
+static struct snd_kcontrol *snd_ac97_find_mixer_ctl(struct snd_ac97 *ac97,
+						    const char *name)
+{
+	struct snd_ctl_elem_id id;
+	memset(&id, 0, sizeof(id));
+	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+	strcpy(id.name, name);
+	return snd_ctl_find_id(ac97->bus->card, &id);
+}
+
+/* create a virtual master control and add slaves */
+int snd_ac97_add_vmaster(struct snd_ac97 *ac97, char *name,
+			 const unsigned int *tlv, const char **slaves)
+{
+	struct snd_kcontrol *kctl;
+	const char **s;
+	int err;
+
+	kctl = snd_ctl_make_virtual_master(name, tlv);
+	if (!kctl)
+		return -ENOMEM;
+	err = snd_ctl_add(ac97->bus->card, kctl);
+	if (err < 0)
+		return err;
+
+	for (s = slaves; *s; s++) {
+		struct snd_kcontrol *sctl;
+
+		sctl = snd_ac97_find_mixer_ctl(ac97, *s);
+		if (!sctl) {
+			snd_printdd("Cannot find slave %s, skipped\n", *s);
+			continue;
+		}
+		err = snd_ctl_add_slave(kctl, sctl);
+		if (err < 0)
+			return err;
+	}
+	return 0;
+}
+
 static int patch_vt1616_specific(struct snd_ac97 * ac97)
 {
+	struct snd_kcontrol *kctl;
 	int err;
 
 	if (snd_ac97_try_bit(ac97, 0x5a, 9))
@@ -3361,6 +3419,24 @@ static int patch_vt1616_specific(struct snd_ac97 * ac97)
 			return err;
 	if ((err = patch_build_controls(ac97, &snd_ac97_controls_vt1616[1], ARRAY_SIZE(snd_ac97_controls_vt1616) - 1)) < 0)
 		return err;
+
+	/* There is already a misnamed master switch.  Rename it.  */
+	kctl = snd_ac97_find_mixer_ctl(ac97, "Master Playback Volume");
+	if (!kctl)
+		return -EINVAL;
+
+	snd_ac97_rename_vol_ctl(ac97, "Master Playback", "Front Playback");
+
+	err = snd_ac97_add_vmaster(ac97, "Master Playback Volume",
+				   kctl->tlv.p, slave_vols_vt1616);
+	if (err < 0)
+		return err;
+
+	err = snd_ac97_add_vmaster(ac97, "Master Playback Switch",
+				   NULL, slave_sws_vt1616);
+	if (err < 0)
+		return err;
+
 	return 0;
 }