diff options
| -rw-r--r-- | sound/usb/mixer.c | 45 |
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); |