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authorGuenter Roeck <linux@roeck-us.net>2014-08-05 09:54:04 -0700
committerGuenter Roeck <linux@roeck-us.net>2014-08-05 17:49:12 -0700
commit539a719f9b90f37b934b90ad52be646b9e74a9f6 (patch)
treeb3dc5d7646eea41985183f9c10d57d12e6b5f12c /drivers/hwmon
parente981429557cbe10c780fab1c1a237cb832757652 (diff)
downloadlinux-539a719f9b90f37b934b90ad52be646b9e74a9f6.tar.bz2
hwmon: (emc6w201) Fix temperature limit range
Temperature limit range is [-127, 127], not [-127, 128]. The wrong range caused a bad limit to be written into the chip if the limit was set to a value of 128 degrees C or above. Also use DIV_ROUND_CLOSEST instead of a plain divide operation to reduce the rounding error when writing temperature limits. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Jean Delvare <jdelvare@suse.de>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/emc6w201.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/hwmon/emc6w201.c b/drivers/hwmon/emc6w201.c
index e87da902f3ae..ada90716448d 100644
--- a/drivers/hwmon/emc6w201.c
+++ b/drivers/hwmon/emc6w201.c
@@ -252,12 +252,12 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
if (err < 0)
return err;
- val /= 1000;
+ val = DIV_ROUND_CLOSEST(val, 1000);
reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
: EMC6W201_REG_TEMP_HIGH(nr);
mutex_lock(&data->update_lock);
- data->temp[sf][nr] = clamp_val(val, -127, 128);
+ data->temp[sf][nr] = clamp_val(val, -127, 127);
err = emc6w201_write8(client, reg, data->temp[sf][nr]);
mutex_unlock(&data->update_lock);