1 files changed, 38 insertions, 14 deletions

diff --git a/firmware/usbstack/usb_class_driver.h b/firmware/usbstack/usb_class_driver.h
index 8bd9de0119..df21228480 100644
--- a/firmware/usbstack/usb_class_driver.h
+++ b/firmware/usbstack/usb_class_driver.h
@@ -23,41 +23,65 @@
 /* Common api, implemented by all class drivers */
 
 struct usb_class_driver {
+        /* First some runtime data */
     bool enabled;
+    int first_interface;
+    int last_interface;
+
+        /* Driver api starts here */
+
+        /* Set this to true if the driver needs exclusive disk access (e.g. usb storage) */
     bool needs_exclusive_ata;
-    int usb_endpoint;
-    int usb_interface;
+
+    /* Tells the driver what its first interface number will be. The driver
+       returns the number of the first available interface for the next driver
+       (i.e. a driver with one interface will return interface+1)
+           A driver must have at least one interface
+           Mandatory function */
+    int (*set_first_interface)(int interface);
+
+    /* Tells the driver what its first endpoint pair number will be. The driver
+       returns the number of the first available endpoint pair for the next
+       driver (i.e. a driver with one endpoint pair will return endpoint +1)
+           Mandatory function */
+    int (*set_first_endpoint)(int endpoint);
 
     /* Asks the driver to put the interface descriptor and all other
-       needed descriptor for this driver at dest, for the given settings.
-       Returns the number of bytes taken by these descriptors. */
-    int (*get_config_descriptor)(unsigned char *dest,
-              int max_packet_size, int interface_number, int endpoint);
+       needed descriptor for this driver at dest.
+       Returns the number of bytes taken by these descriptors.
+           Mandatory function */
+    int (*get_config_descriptor)(unsigned char *dest, int max_packet_size);
 
     /* Tells the driver that a usb connection has been set up and is now
-       ready to use. */
-    void (*init_connection)(int interface,int endpoint);
+       ready to use. 
+           Optional function */
+    void (*init_connection)(void);
 
     /* Initialises the driver. This can be called multiple times,
        and should not perform any action that can disturb other threads
-       (like getting the audio buffer) */
+       (like getting the audio buffer)
+           Optional function */
     void (*init)(void);
 
-    /* Tells the driver that the usb connection is no longer active */
+    /* Tells the driver that the usb connection is no longer active 
+           Optional function */
     void (*disconnect)(void);
 
     /* Tells the driver that a usb transfer has been completed. Note that "in"
-       is relative to the host */
-    void (*transfer_complete)(bool in, int status, int length);
+       is relative to the host 
+           Optional function */
+    void (*transfer_complete)(int ep,bool in, int status, int length);
 
     /* Tells the driver that a control request has come in. If the driver is
        able to handle it, it should ack the request, and return true. Otherwise
-       it should return false. */
+       it should return false. 
+           Optional function */
     bool (*control_request)(struct usb_ctrlrequest* req);
 
 #ifdef HAVE_HOTSWAP
     /* Tells the driver that a hotswappable disk/card was inserted or
-       extracted */
+       extracted 
+           Optional function */
     void (*notify_hotswap)(int volume, bool inserted);
 #endif
 };