[ALSA] oxygen: add SPDIF loopback control

Add a mixer control for the SPDIF loopback function.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 38 insertions, 0 deletions

diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
index 0993c29e62f1..6b7420fdd026 100644
--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -408,6 +408,37 @@ static int spdif_input_default_get(struct snd_kcontrol *ctl,
         return 0;
 }
 
+static int spdif_loopback_get(struct snd_kcontrol *ctl,
+                              struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+
+        value->value.integer.value[0] =
+                !!(oxygen_read32(chip, OXYGEN_SPDIF_CONTROL)
+                   & OXYGEN_SPDIF_LOOPBACK);
+        return 0;
+}
+
+static int spdif_loopback_put(struct snd_kcontrol *ctl,
+                              struct snd_ctl_elem_value *value)
+{
+        struct oxygen *chip = ctl->private_data;
+        u32 oldreg, newreg;
+        int changed;
+
+        spin_lock_irq(&chip->reg_lock);
+        oldreg = oxygen_read32(chip, OXYGEN_SPDIF_CONTROL);
+        if (value->value.integer.value[0])
+                newreg = oldreg | OXYGEN_SPDIF_LOOPBACK;
+        else
+                newreg = oldreg & ~OXYGEN_SPDIF_LOOPBACK;
+        changed = newreg != oldreg;
+        if (changed)
+                oxygen_write32(chip, OXYGEN_SPDIF_CONTROL, newreg);
+        spin_unlock_irq(&chip->reg_lock);
+        return changed;
+}
+
 static int ac97_switch_get(struct snd_kcontrol *ctl,
                            struct snd_ctl_elem_value *value)
 {
@@ -620,6 +651,13 @@ static const struct snd_kcontrol_new controls[] = {
                 .info = spdif_info,
                 .get = spdif_input_default_get,
         },
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = SNDRV_CTL_NAME_IEC958("Loopback ", NONE, SWITCH),
+                .info = snd_ctl_boolean_mono_info,
+                .get = spdif_loopback_get,
+                .put = spdif_loopback_put,
+        },
 };
 
 static const struct snd_kcontrol_new ac97_controls[] = {