ALSA: usb-audio: Add mute TLV for playback volumes on C-Media devices

[pandora-kernel.git] / sound / usb / mixer_quirks.c

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index d422d16..ee1a148 100644 (file)
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -726,6 +726,12 @@ void snd_usb_mixer_fu_apply_quirk(struct usb_mixer_interface *mixer,
                if (unitid == 7 && cval->control == UAC_FU_VOLUME)
                        snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
                break;
+       /* lowest playback value is muted on C-Media devices */
+       case USB_ID(0x0d8c, 0x000c):
+       case USB_ID(0x0d8c, 0x0014):
+               if (strstr(kctl->id.name, "Playback"))
+                       cval->min_mute = 1;
+               break;
        }
 }