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hwmon: (w83l768ng) Fix fan speed control range

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commit 33a7ab91d5 upstream.

The W83L786NG stores the fan speed on 4 bits while the sysfs interface
uses a 0-255 range. Thus the driver should scale the user input down
to map it to the device range, and scale up the value read from the
device before presenting it to the user. The reserved register nibble
should be left unchanged.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jean Delvare 2013-12-12 08:05:32 +01:00 committed by Greg Kroah-Hartman
parent 420cc6d77f
commit b7a9e22f44
1 changed files with 6 additions and 3 deletions
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9
drivers/hwmon/w83l786ng.c
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@ -481,9 +481,11 @@ store_pwm(struct device *dev, struct device_attribute *attr,
if (err)
return err;
val = SENSORS_LIMIT(val, 0, 255);
val = DIV_ROUND_CLOSEST(val, 0x11);
mutex_lock(&data->update_lock);
data->pwm[nr] = val;
data->pwm[nr] = val * 0x11;
val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
mutex_unlock(&data->update_lock);
return count;
@ -782,8 +784,9 @@ static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
? 0 : 1;
data->pwm_enable[i] =
((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
data->pwm[i] = w83l786ng_read_value(client,
W83L786NG_REG_PWM[i]);
data->pwm[i] =
(w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
& 0x0f) * 0x11;
}