Trying to set the fan min limit to 0 currently writes 0 to the
register, which is an invalid value. It's read back as -1 and the
alarm flag is raised. Instead we should write 0xffff (maximum
value), which reads back as 0 and no alarm flag is raised.
Signed-off-by: Jean Delvare <khali at linux-fr.org>
---
drivers/hwmon/lm85.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- linux-2.6.22-rc6.orig/drivers/hwmon/lm85.c 2007-07-01 14:30:37.000000000 +0200
+++ linux-2.6.22-rc6/drivers/hwmon/lm85.c 2007-07-01 17:00:44.000000000 +0200
@@ -145,7 +145,12 @@ static int lm85_scaling[] = { /* .001 V
#define INS_FROM_REG(n,val) SCALE((val), 192, lm85_scaling[n])
/* FAN speed is measured using 90kHz clock */
-#define FAN_TO_REG(val) (SENSORS_LIMIT( (val)<=0?0: 5400000/(val),0,65534))
+static inline u16 FAN_TO_REG(unsigned long val)
+{
+ if (!val)
+ return 0xffff;
+ return SENSORS_LIMIT(5400000 / val, 1, 0xfffe);
+}
#define FAN_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:5400000/(val))
/* Temperature is reported in .001 degC increments */
@@ -391,7 +396,7 @@ static ssize_t set_fan_min(struct device
int nr = to_sensor_dev_attr(attr)->index;
struct i2c_client *client = to_i2c_client(dev);
struct lm85_data *data = i2c_get_clientdata(client);
- long val = simple_strtol(buf, NULL, 10);
+ unsigned long val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
data->fan_min[nr] = FAN_TO_REG(val);
--
Jean Delvare
