hwmon: (emc2103) Clamp limits instead of bailing out

commit f6c2dd20108c35e30e2c1f3c6142d189451a626b upstream.

It is customary to clamp limits instead of bailing out with an error
if a configured limit is out of the range supported by the driver.
This simplifies limit configuration, since the user will not typically
know chip and/or driver specific limits.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/hwmon/emc2103.c b/drivers/hwmon/emc2103.c
index af914ad..a074d21 100644 (file)
--- a/drivers/hwmon/emc2103.c
+++ b/drivers/hwmon/emc2103.c
@@ -248,9 +248,7 @@ static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
        if (result < 0)
                return -EINVAL;
 
-       val = DIV_ROUND_CLOSEST(val, 1000);
-       if ((val < -63) || (val > 127))
-               return -EINVAL;
+       val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -63, 127);
 
        mutex_lock(&data->update_lock);
        data->temp_min[nr] = val;
@@ -272,9 +270,7 @@ static ssize_t set_temp_max(struct device *dev, struct device_attribute *da,
        if (result < 0)
                return -EINVAL;
 
-       val = DIV_ROUND_CLOSEST(val, 1000);
-       if ((val < -63) || (val > 127))
-               return -EINVAL;
+       val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -63, 127);
 
        mutex_lock(&data->update_lock);
        data->temp_max[nr] = val;
@@ -386,15 +382,14 @@ static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
 {
        struct emc2103_data *data = emc2103_update_device(dev);
        struct i2c_client *client = to_i2c_client(dev);
-       long rpm_target;
+       unsigned long rpm_target;
 
-       int result = strict_strtol(buf, 10, &rpm_target);
+       int result = kstrtoul(buf, 10, &rpm_target);
        if (result < 0)
                return -EINVAL;
 
        /* Datasheet states 16384 as maximum RPM target (table 3.2) */
-       if ((rpm_target < 0) || (rpm_target > 16384))
-               return -EINVAL;
+       rpm_target = clamp_val(rpm_target, 0, 16384);
 
        mutex_lock(&data->update_lock);