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hwmon: (nct6775) Only display fan speed tolerance conditionally

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A fan speed tolerance only makes sense if a fan target speed has been
configured in the first place. Otherwise we get odd output such as

fan1_target:0
fan1_tolerance:337500

Only display values other than 0 if a fan target speed has been configured.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2018-09-17 09:24:11 -07:00
parent 0665a1d623
commit 61b6c66a8f
1 changed files with 17 additions and 11 deletions
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28
drivers/hwmon/nct6775.c
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@ -2847,6 +2847,8 @@ store_temp_tolerance(struct device *dev, struct device_attribute *attr,
* Fan speed tolerance is a tricky beast, since the associated register is
* a tick counter, but the value is reported and configured as rpm.
* Compute resulting low and high rpm values and report the difference.
* A fan speed tolerance only makes sense if a fan target speed has been
* configured, so only display values other than 0 if that is the case.
*/
static ssize_t
show_speed_tolerance(struct device *dev, struct device_attribute *attr,
@ -2855,19 +2857,23 @@ show_speed_tolerance(struct device *dev, struct device_attribute *attr,
struct nct6775_data *data = nct6775_update_device(dev);
struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
int nr = sattr->index;
int low = data->target_speed[nr] - data->target_speed_tolerance[nr];
int high = data->target_speed[nr] + data->target_speed_tolerance[nr];
int tolerance;
int target = data->target_speed[nr];
int tolerance = 0;
if (low <= 0)
low = 1;
if (high > 0xffff)
high = 0xffff;
if (high < low)
high = low;
if (target) {
int low = target - data->target_speed_tolerance[nr];
int high = target + data->target_speed_tolerance[nr];
tolerance = (fan_from_reg16(low, data->fan_div[nr])
- fan_from_reg16(high, data->fan_div[nr])) / 2;
if (low <= 0)
low = 1;
if (high > 0xffff)
high = 0xffff;
if (high < low)
high = low;
tolerance = (fan_from_reg16(low, data->fan_div[nr])
- fan_from_reg16(high, data->fan_div[nr])) / 2;
}
return sprintf(buf, "%d\n", tolerance);
}