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hwmon: (emc6w201) Fix temperature limit range

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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>
This commit is contained in:
Guenter Roeck 2014-08-05 09:54:04 -07:00
parent e981429557
commit 539a719f9b
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/emc6w201.c
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@ -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);