Extra debugging for Linux USB host.

index 78f4b2a..97842c9 100644
@@ -207,7 +207,7 @@ static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
     i += dev_descr_len;
     while (i < dev->descr_len) {
 #ifdef DEBUG
-        printf("i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len,
+        printf("husb: i is %d, descr_len is %d, dl %d, dt %d\n", i, dev->descr_len,
                dev->descr[i], dev->descr[i+1]);
 #endif
         if (dev->descr[i+1] != USB_DT_CONFIG) {

@@ -217,7 +217,7 @@ static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
         config_descr_len = dev->descr[i];
 
 #ifdef DEBUG
-	printf("config #%d need %d\n", dev->descr[i + 5], configuration); 
+	printf("husb: config #%d need %d\n", dev->descr[i + 5], configuration); 
 #endif
 
         if (configuration < 0 || configuration == dev->descr[i + 5])

@@ -227,7 +227,7 @@ static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
     }
 
     if (i >= dev->descr_len) {
-        printf("usb_host: error - device has no matching configuration\n");
+        printf("husb: error. device has no matching configuration\n");
         goto fail;
     }
     nb_interfaces = dev->descr[i + 4];

@@ -264,7 +264,7 @@ static int usb_host_update_interfaces(USBHostDevice *dev, int configuration)
     }
 
 #ifdef DEBUG
-    printf("usb_host: %d interfaces claimed for configuration %d\n",
+    printf("husb: %d interfaces claimed for configuration %d\n",
            nb_interfaces, configuration);
 #endif
 

@@ -322,10 +322,9 @@ static int usb_host_handle_control(USBDevice *dev,
         ret = ioctl(s->fd, USBDEVFS_SETINTERFACE, &si);
         usb_linux_update_endp_table(s);
     } else if (request == (DeviceOutRequest | USB_REQ_SET_CONFIGURATION)) {
-#ifdef DEBUG
-        printf("usb_host_handle_control: SET_CONFIGURATION request - "
-               "config %d\n", value & 0xff);
-#endif
+        #ifdef DEBUG
+        printf("husb: ctrl set config %d\n", value & 0xff);
+        #endif
         if (s->configuration != (value & 0xff)) {
             s->configuration = (value & 0xff);
             intf_update_required = 1;

@@ -341,6 +340,11 @@ static int usb_host_handle_control(USBDevice *dev,
         ct.timeout = 50;
         ct.data = data;
         ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
+
+        #ifdef DEBUG
+        printf("husb: ctrl. req 0x%x val 0x%x index %d len %d ret %d errno %d\n",
+            request, value, index, length, ret, errno);
+        #endif
     }
 
     if (ret < 0) {

@@ -383,15 +387,18 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
     bt.timeout = 50;
     bt.data = p->data;
     ret = ioctl(s->fd, USBDEVFS_BULK, &bt);
+
+#ifdef DEBUG
+    printf("husb: bulk. ep %d len %d ret %d errno %d\n",
+        bt.ep, bt.len, ret, errno);
+#endif
+
     if (ret < 0) {
         switch(errno) {
         case ETIMEDOUT:
             return USB_RET_NAK;
         case EPIPE:
         default:
-#ifdef DEBUG
-            printf("handle_data: errno=%d\n", errno);
-#endif
             return USB_RET_STALL;
         }
     } else {