ALSA: line6: Allow processing of raw incoming messages

[cascardo/linux.git] / sound / usb / line6 / driver.h

diff --git a/sound/usb/line6/driver.h b/sound/usb/line6/driver.h
index d48c7d2..88cf1e7 100644 (file)
--- a/sound/usb/line6/driver.h
+++ b/sound/usb/line6/driver.h
@@ -147,15 +147,18 @@ struct usb_line6 {
        /* URB for listening to POD data endpoint */
        struct urb *urb_listen;
 
-       /* Buffer for listening to POD data endpoint */
+       /* Buffer for incoming data from POD data endpoint */
        unsigned char *buffer_listen;
 
-       /* Buffer for message to be processed */
+       /* Buffer for message to be processed, generated from MIDI layer */
        unsigned char *buffer_message;
 
-       /* Length of message to be processed */
+       /* Length of message to be processed, generated from MIDI layer  */
        int message_length;
 
+       /* If MIDI is supported, buffer_message contains the pre-processed data;
+        * otherwise the data is only in urb_listen (buffer_incoming).
+        */
        void (*process_message)(struct usb_line6 *);
        void (*disconnect)(struct usb_line6 *line6);
 };