ALSA: dummy: allow disabling mixer controls

To make the testing of deactivated mixer controls easier (and for people
with common hardware, possible), add a control that deactivates some
other controls.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index 54bb6644a598a8177e3fbec4220df2966abd6131..4f522cf4845508cbc366fe8b4b0b16d2226f6de3 100644 (file)
--- a/sound/drivers/dummy.c
+++ b/sound/drivers/dummy.c
@@ -134,6 +134,9 @@ struct snd_dummy {
        spinlock_t mixer_lock;
        int mixer_volume[MIXER_ADDR_LAST+1][2];
        int capture_source[MIXER_ADDR_LAST+1][2];
+       int iobox;
+       struct snd_kcontrol *cd_volume_ctl;
+       struct snd_kcontrol *cd_switch_ctl;
        const struct dummy_timer_ops *timer_ops;
 };
 
@@ -817,6 +820,57 @@ static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_el
        return change;
 }
 
+static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_info *info)
+{
+       const char *const names[] = { "None", "CD Player" };
+
+       return snd_ctl_enum_info(info, 1, 2, names);
+}
+
+static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
+                              struct snd_ctl_elem_value *value)
+{
+       struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
+
+       value->value.enumerated.item[0] = dummy->iobox;
+       return 0;
+}
+
+static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
+                              struct snd_ctl_elem_value *value)
+{
+       struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
+       int changed;
+
+       if (value->value.enumerated.item[0] > 1)
+               return -EINVAL;
+
+       changed = value->value.enumerated.item[0] != dummy->iobox;
+       if (changed) {
+               dummy->iobox = value->value.enumerated.item[0];
+
+               if (dummy->iobox) {
+                       dummy->cd_volume_ctl->vd[0].access &=
+                               ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+                       dummy->cd_switch_ctl->vd[0].access &=
+                               ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+               } else {
+                       dummy->cd_volume_ctl->vd[0].access |=
+                               SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+                       dummy->cd_switch_ctl->vd[0].access |=
+                               SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+               }
+
+               snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
+                              &dummy->cd_volume_ctl->id);
+               snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
+                              &dummy->cd_switch_ctl->id);
+       }
+
+       return changed;
+}
+
 static struct snd_kcontrol_new snd_dummy_controls[] = {
 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
@@ -827,22 +881,37 @@ DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
-DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
+DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
+{
+       .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+       .name  = "External I/O Box",
+       .info  = snd_dummy_iobox_info,
+       .get   = snd_dummy_iobox_get,
+       .put   = snd_dummy_iobox_put,
+},
 };
 
 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 {
        struct snd_card *card = dummy->card;
+       struct snd_kcontrol *kcontrol;
        unsigned int idx;
        int err;
 
        spin_lock_init(&dummy->mixer_lock);
        strcpy(card->mixername, "Dummy Mixer");
+       dummy->iobox = 1;
 
        for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
-               err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
+               kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
+               err = snd_ctl_add(card, kcontrol);
                if (err < 0)
                        return err;
+               if (!strcmp(kcontrol->id.name, "CD Volume"))
+                       dummy->cd_volume_ctl = kcontrol;
+               else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
+                       dummy->cd_switch_ctl = kcontrol;
+
        }
        return 0;
 }