blob: 0e9ff1a935c379e1ff63d3b9437a9109553ddad0 [file] [log] [blame]
From: Michael Walle <michael@walle.cc>
Date: Tue, 19 Jul 2016 16:43:26 +0200
Subject: hwmon: (adt7411) set bit 3 in CFG1 register
commit b53893aae441a034bf4dbbad42fe218561d7d81f upstream.
According to the datasheet you should only write 1 to this bit. If it is
not set, at least AIN3 will return bad values on newer silicon revisions.
Fixes: d84ca5b345c2 ("hwmon: Add driver for ADT7411 voltage and temperature sensor")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/hwmon/adt7411.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/hwmon/adt7411.c
+++ b/drivers/hwmon/adt7411.c
@@ -31,6 +31,7 @@
#define ADT7411_REG_CFG1 0x18
#define ADT7411_CFG1_START_MONITOR (1 << 0)
+#define ADT7411_CFG1_RESERVED_BIT3 (1 << 3)
#define ADT7411_REG_CFG2 0x19
#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
@@ -291,8 +292,10 @@ static int __devinit adt7411_probe(struc
mutex_init(&data->device_lock);
mutex_init(&data->update_lock);
+ /* According to the datasheet, we must only write 1 to bit 3 */
ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
- ADT7411_CFG1_START_MONITOR, 1);
+ ADT7411_CFG1_RESERVED_BIT3
+ | ADT7411_CFG1_START_MONITOR, 1);
if (ret < 0)
goto exit_free;