ALSA: oxygen: add digital input validity check switch

Add a mixer control to prevent capturing S/PDIF samples that are not
marked as valid (non-audio or corrupted samples).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 20 insertions, 10 deletions

diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
index 821df1c9d1d0..9bff14d5895d 100644
--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -434,30 +434,31 @@ 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)
+static int spdif_bit_switch_get(struct snd_kcontrol *ctl,
+                                struct snd_ctl_elem_value *value)
 {
         struct oxygen *chip = ctl->private_data;
+        u32 bit = ctl->private_value;
 
         value->value.integer.value[0] =
-                !!(oxygen_read32(chip, OXYGEN_SPDIF_CONTROL)
-                   & OXYGEN_SPDIF_LOOPBACK);
+                !!(oxygen_read32(chip, OXYGEN_SPDIF_CONTROL) & bit);
         return 0;
 }
 
-static int spdif_loopback_put(struct snd_kcontrol *ctl,
-                              struct snd_ctl_elem_value *value)
+static int spdif_bit_switch_put(struct snd_kcontrol *ctl,
+                                struct snd_ctl_elem_value *value)
 {
         struct oxygen *chip = ctl->private_data;
+        u32 bit = ctl->private_value;
         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;
+                newreg = oldreg | bit;
         else
-                newreg = oldreg & ~OXYGEN_SPDIF_LOOPBACK;
+                newreg = oldreg & ~bit;
         changed = newreg != oldreg;
         if (changed)
                 oxygen_write32(chip, OXYGEN_SPDIF_CONTROL, newreg);
@@ -835,8 +836,17 @@ static const struct snd_kcontrol_new spdif_input_controls[] = {
                 .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,
+                .get = spdif_bit_switch_get,
+                .put = spdif_bit_switch_put,
+                .private_value = OXYGEN_SPDIF_LOOPBACK,
+        },
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = SNDRV_CTL_NAME_IEC958("Validity Check ",CAPTURE,SWITCH),
+                .info = snd_ctl_boolean_mono_info,
+                .get = spdif_bit_switch_get,
+                .put = spdif_bit_switch_put,
+                .private_value = OXYGEN_SPDIF_SPDVALID,
         },
 };