usb: add attach callback

Add handle_attach() callback to USBDeviceInfo which is called by the
generic package handler when the device is attached to the usb bus
(i.e. plugged into a port).
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb.c

@@ -194,6 +194,9 @@ int usb_generic_handle_packet(USBDevice *s, USBPacket *p)
     switch(p->pid) {
     case USB_MSG_ATTACH:
         s->state = USB_STATE_ATTACHED;
+        if (s->info->handle_attach) {
+            s->info->handle_attach(s);
+        }
         return 0;
 
     case USB_MSG_DETACH:
@@ -204,7 +207,9 @@ int usb_generic_handle_packet(USBDevice *s, USBPacket *p)
         s->remote_wakeup = 0;
         s->addr = 0;
         s->state = USB_STATE_DEFAULT;
-        s->info->handle_reset(s);
+        if (s->info->handle_reset) {
+            s->info->handle_reset(s);
+        }
         return 0;
     }
 

hw/usb.h

@@ -193,6 +193,11 @@ struct USBDeviceInfo {
      */
     void (*handle_destroy)(USBDevice *dev);
 
+    /*
+     * Attach the device
+     */
+    void (*handle_attach)(USBDevice *dev);
+
     /*
      * Reset the device
      */