diff --git a/kernel/chips/lm78.c b/kernel/chips/lm78.c
index 27b21a9c..e91d31be 100644
--- a/kernel/chips/lm78.c
+++ b/kernel/chips/lm78.c
@@ -448,7 +448,7 @@ int lm78_detect_smbus(struct i2c_adapter *adapter)
     /* Later on, we will keep a list of registered addresses for each
        adapter, and check whether they are used here */
 
-    if (smbus_read_byte_data(adapter,address,LM78_REG_CONFIG) == 0xff) 
+    if (smbus_read_byte_data(adapter,address,LM78_REG_CONFIG) < 0) 
       continue;
 
     /* Real detection code goes here */
@@ -467,6 +467,11 @@ int lm78_detect_smbus(struct i2c_adapter *adapter)
       type = lm79;
       type_name = "lm79";
       client_name = "LM79 chip";
+    } else if (err == 0x02) {
+      printk("lm78.o: Warning: Winbond W83781D detected (treated as a LM79)\n");
+      type = lm79;
+      type_name = "lm79";
+      client_name = "LM79 chip";
     } else {
 #ifdef DEBUG
       printk("lm78.o: warning: probed non-lm78 chip?!? (%x)\n",err);
diff --git a/src/lm78.c b/src/lm78.c
index 27b21a9c..e91d31be 100644
--- a/src/lm78.c
+++ b/src/lm78.c
@@ -448,7 +448,7 @@ int lm78_detect_smbus(struct i2c_adapter *adapter)
     /* Later on, we will keep a list of registered addresses for each
        adapter, and check whether they are used here */
 
-    if (smbus_read_byte_data(adapter,address,LM78_REG_CONFIG) == 0xff) 
+    if (smbus_read_byte_data(adapter,address,LM78_REG_CONFIG) < 0) 
       continue;
 
     /* Real detection code goes here */
@@ -467,6 +467,11 @@ int lm78_detect_smbus(struct i2c_adapter *adapter)
       type = lm79;
       type_name = "lm79";
       client_name = "LM79 chip";
+    } else if (err == 0x02) {
+      printk("lm78.o: Warning: Winbond W83781D detected (treated as a LM79)\n");
+      type = lm79;
+      type_name = "lm79";
+      client_name = "LM79 chip";
     } else {
 #ifdef DEBUG
       printk("lm78.o: warning: probed non-lm78 chip?!? (%x)\n",err);