diff --git a/ChangeLog b/ChangeLog
index c0add5e2c..c3d21d7ce 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,8 @@
 
 	* doc/descriptions/unsupported.desc: Added Minolta and Visioneer
 	  scanners. Updated Avision, Medion, and UMAX scanners.
+	* tools/check-usb-chip.c: Added test for Genesys Logig GL660 +
+	  GL646 combination. Added some more messages about what's going on.
 
 2003-07-29  Matthew Duggan <stauff1@users.sourceforge.net>
 
diff --git a/tools/check-usb-chip.c b/tools/check-usb-chip.c
index b50a065db..f3d2405be 100644
--- a/tools/check-usb-chip.c
+++ b/tools/check-usb-chip.c
@@ -1181,6 +1181,159 @@ check_gl646 (struct usb_device *dev)
   return "GL646";
 }
 
+/* check for the combination of gl660 and gl646 */
+static char *
+check_gl660_gl646 (struct usb_device *dev)
+{
+  unsigned char val;
+  int result;
+  usb_dev_handle *handle;
+
+  if (verbose > 2)
+    printf ("    checking for GL660+GL646 ...\n");
+
+  /* Check device descriptor */
+  if ((dev->descriptor.bDeviceClass != USB_CLASS_VENDOR_SPEC)
+      || (dev->config[0].interface[0].altsetting[0].bInterfaceClass != USB_CLASS_PER_INTERFACE))
+    {
+      if (verbose > 2)
+	printf
+	  ("    this is not a GL660+GL646 (bDeviceClass = %d, bInterfaceClass = %d)\n",
+	   dev->descriptor.bDeviceClass,
+	   dev->config[0].interface[0].altsetting[0].bInterfaceClass);
+      return 0;
+    }
+  if (dev->descriptor.bcdUSB != 0x200)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (bcdUSB = 0x%x)\n",
+		dev->descriptor.bcdUSB);
+      return 0;
+    }
+  if (dev->descriptor.bDeviceSubClass != 0xff)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (bDeviceSubClass = 0x%x)\n",
+		dev->descriptor.bDeviceSubClass);
+      return 0;
+    }
+  if (dev->descriptor.bDeviceProtocol != 0xff)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (bDeviceProtocol = 0x%x)\n",
+		dev->descriptor.bDeviceProtocol);
+      return 0;
+    }
+
+  /* Check endpoints */
+  if (dev->config[0].interface[0].altsetting[0].bNumEndpoints != 3)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (bNumEndpoints = %d)\n",
+		dev->config[0].interface[0].altsetting[0].bNumEndpoints);
+      return 0;
+    }
+
+  if ((dev->config[0].interface[0].altsetting[0].endpoint[0].
+       bEndpointAddress != 0x81)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[0].
+	  bmAttributes != 0x02)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[0].
+	  wMaxPacketSize != 0x40)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[0].bInterval !=
+	  0x0))
+    {
+      if (verbose > 2)
+	printf
+	  ("    this is not a GL660+GL646 (bEndpointAddress = 0x%x, bmAttributes = 0x%x, "
+	   "wMaxPacketSize = 0x%x, bInterval = 0x%x)\n",
+	   dev->config[0].interface[0].altsetting[0].endpoint[0].
+	   bEndpointAddress,
+	   dev->config[0].interface[0].altsetting[0].endpoint[0].bmAttributes,
+	   dev->config[0].interface[0].altsetting[0].endpoint[0].
+	   wMaxPacketSize,
+	   dev->config[0].interface[0].altsetting[0].endpoint[0].bInterval);
+      return 0;
+    }
+
+  if ((dev->config[0].interface[0].altsetting[0].endpoint[1].
+       bEndpointAddress != 0x02)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[1].
+	  bmAttributes != 0x02)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[1].
+	  wMaxPacketSize != 0x40)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[1].bInterval !=
+	  0))
+    {
+      if (verbose > 2)
+	printf
+	  ("    this is not a GL660+GL646 (bEndpointAddress = 0x%x, bmAttributes = 0x%x, "
+	   "wMaxPacketSize = 0x%x, bInterval = 0x%x)\n",
+	   dev->config[0].interface[0].altsetting[0].endpoint[1].
+	   bEndpointAddress,
+	   dev->config[0].interface[0].altsetting[0].endpoint[1].bmAttributes,
+	   dev->config[0].interface[0].altsetting[0].endpoint[1].
+	   wMaxPacketSize,
+	   dev->config[0].interface[0].altsetting[0].endpoint[1].bInterval);
+      return 0;
+    }
+
+  if ((dev->config[0].interface[0].altsetting[0].endpoint[2].
+       bEndpointAddress != 0x83)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[2].
+	  bmAttributes != 0x03)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[2].
+	  wMaxPacketSize != 0x1)
+      || (dev->config[0].interface[0].altsetting[0].endpoint[2].bInterval !=
+	  8))
+    {
+      if (verbose > 2)
+	printf
+	  ("    this is not a GL660+GL646 (bEndpointAddress = 0x%x, bmAttributes = 0x%x, "
+	   "wMaxPacketSize = 0x%x, bInterval = 0x%x)\n",
+	   dev->config[0].interface[0].altsetting[0].endpoint[2].
+	   bEndpointAddress,
+	   dev->config[0].interface[0].altsetting[0].endpoint[2].bmAttributes,
+	   dev->config[0].interface[0].altsetting[0].endpoint[2].
+	   wMaxPacketSize,
+	   dev->config[0].interface[0].altsetting[0].endpoint[2].bInterval);
+      return 0;
+    }
+
+  result = prepare_interface (dev, &handle);
+  if (!result)
+    return "GL660+GL646?";
+
+  result = gl646_write_reg (handle, 0x38, 0x15);
+  if (!result)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (writing register failed)\n");
+      finish_interface (handle);
+      return 0;
+    }
+
+  result = gl646_read_reg (handle, 0x4e, &val);
+  if (!result)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (reading register failed)\n");
+      finish_interface (handle);
+      return 0;
+    }
+
+  if (val != 0x15)
+    {
+      if (verbose > 2)
+	printf ("    this is not a GL660+GL646 (reg 0x4e != reg 0x38)\n");
+      finish_interface (handle);
+      return 0;
+    }
+  finish_interface (handle);
+  return "GL660+GL646";
+}
+
+
 
 char *
 check_usb_chip (struct usb_device *dev, int verbosity)
@@ -1189,35 +1342,41 @@ check_usb_chip (struct usb_device *dev, int verbosity)
 
   verbose = verbosity;
 
+  if (verbose > 2)
+    printf ("\n<trying to find out which USB chip is used>\n");
+
   chip_name = check_gt6801 (dev);
-  if (chip_name)
-    return chip_name;
 
-  chip_name = check_gt6816 (dev);
-  if (chip_name)
-    return chip_name;
+  if (!chip_name)
+    chip_name = check_gt6816 (dev);
 
-  chip_name = check_ma1017 (dev);
-  if (chip_name)
-    return chip_name;
+  if (!chip_name)
+    chip_name = check_ma1017 (dev);
 
-  chip_name = check_ma1015 (dev);
-  if (chip_name)
-    return chip_name;
+  if (!chip_name)
+    chip_name = check_ma1015 (dev);
 
-  chip_name = check_ma1509 (dev);
-  if (chip_name)
-    return chip_name;
+  if (!chip_name)
+    chip_name = check_ma1509 (dev);
 
-  chip_name = check_merlin (dev);
-  if (chip_name)
-    return chip_name;
+  if (!chip_name)
+    chip_name = check_merlin (dev);
 
-  chip_name = check_gl646 (dev);
-  if (chip_name)
-    return chip_name;
+  if (!chip_name)
+    chip_name = check_gl646 (dev);
 
-  return 0;			/* unknown chipset */
+  if (!chip_name)
+    chip_name = check_gl660_gl646 (dev);
+
+  if (verbose > 2)
+    {
+      if (chip_name)
+	printf ("<This USB chip looks like a %s>\n\n", chip_name);
+      else
+	printf ("<Couldn't determine the type of the USB chip>\n\n");
+    }
+
+  return chip_name;
 }
 
 #endif /* HAVE_LIBUSB */