The LM78 detection is relatively weak, and sometimes recent Winbond

chips can be misdetected as an LM78. We have had repeated reports of
this happening. (Backport from Linux 2.6.)


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@5371 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -12,6 +12,7 @@ SVN-HEAD
                    Properly report bus arbitration lost (2.6 backport)
   Module i2c-piix4: Minor cleanups (2.6 backport)
   Module i2c-viapro: Add VX800/VX820 support (2.6 backport)
+  Module lm78: Prevent misdetection of Winbond chips
   Module lm90: Don't spam the kernel log (2.6 backport)
   Program pwmconfig: Fix MINSTOP and MINSTART test functions (#2340)
                      Change default for MINTEMP from 0 to 20 degrees C

kernel/chips/lm78.c

@@ -329,6 +329,10 @@ static int lm78_detect(struct i2c_adapter *adapter, int address,
 		if (!is_isa
 		    && (lm78_read_value(new_client, LM78_REG_I2C_ADDR) !=
 			address)) goto ERROR1;
+		/* Explicitly prevent the misdetection of Winbond chips */
+		i = lm78_read_value(new_client, 0x4f);
+		if (i == 0xa3 || i == 0x5c)
+			goto ERROR1;
 	}
 
 	/* Determine the chip type. */