From 2fa054456e723d7741be4eeb09bb879b802fad9d Mon Sep 17 00:00:00 2001
From: Jan Hauffa <jhauffa@gmail.com>
Date: Sun, 15 May 2011 15:09:21 +0200
Subject: [PATCH] Detect USB controller type.

---
 backend/mustek_usb2_asic.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/backend/mustek_usb2_asic.c b/backend/mustek_usb2_asic.c
index 22a2c4c1e..82bed8ccb 100644
--- a/backend/mustek_usb2_asic.c
+++ b/backend/mustek_usb2_asic.c
@@ -1978,6 +1978,7 @@ SANE_Status
 Asic_Open (ASIC * chip)
 {
   SANE_Status status;
+  struct sanei_usb_dev_descriptor desc;
   DBG_ASIC_ENTER ();
 
   if (chip->firmwarestate > FS_OPENED)
@@ -1996,6 +1997,15 @@ Asic_Open (ASIC * chip)
       return status;
     }
 
+  status = sanei_usb_get_descriptor (chip->fd, &desc);
+  if (status != SANE_STATUS_GOOD)
+    {
+      DBG (DBG_ERR, "sanei_usb_get_descriptor failed: %s\n",
+	   sane_strstatus (status));
+      return status;
+    }
+  chip->isUsb20 = (desc.bcd_usb >= 0x0200) ? SANE_TRUE : SANE_FALSE;
+
   status = OpenScanChip (chip);
   if (status != SANE_STATUS_GOOD)
     {
@@ -2074,7 +2084,6 @@ Asic_Initialize (ASIC * chip, const ASIC_ModelParams * params)
 
   chip->params = params;
   chip->isFirstOpenChip = SANE_TRUE;
-  chip->isUsb20 = SANE_FALSE;
   chip->dwBytesCountPerRow = 0;
   chip->isMotorMoveToFirstLine = MOTOR_MOVE_TO_FIRST_LINE_ENABLE;
   chip->pShadingTable = NULL;