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. We have an explicit check against this for the ISA
access, do the same for I2C access now.
Signed-off-by: Jean Delvare <khali at linux-fr.org>
---
drivers/hwmon/lm78.c | 6 ++++++
1 file changed, 6 insertions(+)
--- linux-2.6.27-rc5.orig/drivers/hwmon/lm78.c 2008-09-09 18:30:51.000000000 +0200
+++ linux-2.6.27-rc5/drivers/hwmon/lm78.c 2008-09-09 18:33:57.000000000 +0200
@@ -613,6 +613,12 @@ static int lm78_detect(struct i2c_adapte
err = -ENODEV;
goto ERROR2;
}
+ /* Explicitly prevent the misdetection of Winbond chips */
+ i = lm78_read_value(data, 0x4f);
+ if (i == 0xa3 || i == 0x5c) {
+ err = -ENODEV;
+ goto ERROR2;
+ }
}
/* Determine the chip type. */
--
Jean Delvare
