ALSA: usb-mixer: Add support for Audio Class v2.0

[mirror_ubuntu-zesty-kernel.git] / sound / usb / mixer.h

diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index 63101ae201cc23dbbf6d2f9af30b18d95c753bb4..130123854a6cfc37dc2c16cd88281222fa021300 100644 (file)
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -10,6 +10,9 @@ struct usb_mixer_interface {
        /* array[MAX_ID_ELEMS], indexed by unit id */
        struct usb_mixer_elem_info **id_elems;
 
+       /* the usb audio specification version this interface complies to */
+       int protocol;
+
        /* Sound Blaster remote control stuff */
        const struct rc_config *rc_cfg;
        u32 rc_code;