summaryrefslogtreecommitdiff
path: root/sound/usb/mixer.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/usb/mixer.c')
-rw-r--r--sound/usb/mixer.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 76fabc4b72b5..bb203b3684fc 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2801,6 +2801,48 @@ static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
return 0;
}
+static int keep_iface_ctl_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
+
+ ucontrol->value.integer.value[0] = mixer->chip->keep_iface;
+ return 0;
+}
+
+static int keep_iface_ctl_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
+ bool keep_iface = !!ucontrol->value.integer.value[0];
+
+ if (mixer->chip->keep_iface == keep_iface)
+ return 0;
+ mixer->chip->keep_iface = keep_iface;
+ return 1;
+}
+
+static const struct snd_kcontrol_new keep_iface_ctl = {
+ .iface = SNDRV_CTL_ELEM_IFACE_CARD,
+ .name = "Keep Interface",
+ .info = snd_ctl_boolean_mono_info,
+ .get = keep_iface_ctl_get,
+ .put = keep_iface_ctl_put,
+};
+
+static int create_keep_iface_ctl(struct usb_mixer_interface *mixer)
+{
+ struct snd_kcontrol *kctl = snd_ctl_new1(&keep_iface_ctl, mixer);
+
+ /* need only one control per card */
+ if (snd_ctl_find_id(mixer->chip->card, &kctl->id)) {
+ snd_ctl_free_one(kctl);
+ return 0;
+ }
+
+ return snd_ctl_add(mixer->chip->card, kctl);
+}
+
int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
int ignore_error)
{
@@ -2842,6 +2884,9 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
(err = snd_usb_mixer_status_create(mixer)) < 0)
goto _error;
+ err = create_keep_iface_ctl(mixer);
+ if (err < 0)
+ goto _error;
snd_usb_mixer_apply_create_quirk(mixer);