1 files changed, 55 insertions, 0 deletions

diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
new file mode 100644
index 000000000000..130123854a6c
--- /dev/null
+++ b/sound/usb/mixer.h
@@ -0,0 +1,55 @@
+#ifndef __USBMIXER_H
+#define __USBMIXER_H
+
+struct usb_mixer_interface {
+        struct snd_usb_audio *chip;
+        unsigned int ctrlif;
+        struct list_head list;
+        unsigned int ignore_ctl_error;
+        struct urb *urb;
+        /* 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;
+        wait_queue_head_t rc_waitq;
+        struct urb *rc_urb;
+        struct usb_ctrlrequest *rc_setup_packet;
+        u8 rc_buffer[6];
+
+        u8 audigy2nx_leds[3];
+        u8 xonar_u1_status;
+};
+
+#define MAX_CHANNELS    10      /* max logical channels */
+
+struct usb_mixer_elem_info {
+        struct usb_mixer_interface *mixer;
+        struct usb_mixer_elem_info *next_id_elem; /* list of controls with same id */
+        struct snd_ctl_elem_id *elem_id;
+        unsigned int id;
+        unsigned int control;   /* CS or ICN (high byte) */
+        unsigned int cmask; /* channel mask bitmap: 0 = master */
+        int channels;
+        int val_type;
+        int min, max, res;
+        int dBmin, dBmax;
+        int cached;
+        int cache_val[MAX_CHANNELS];
+        u8 initialized;
+};
+
+int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
+                         int ignore_error);
+void snd_usb_mixer_disconnect(struct list_head *p);
+
+void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
+
+int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
+                                int request, int validx, int value_set);
+
+#endif /* __USBMIXER_H */