[ALSA] ac97 - Add virtual master control to VT1616/VT1617A codec.

[linux-2.6-omap-h63xx.git] / sound / pci / ac97 / ac97_patch.c

diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index 1292dcee072df21b34aa39daecaee841a429dfe0..92817f7d46d28c707e56b87899e3b4a73bf2ee92 100644 (file)
--- a/sound/pci/ac97/ac97_patch.c
+++ b/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;
 }