hwmon: (w83l786ng) Fix fan speed control mode setting and reporting

The wrong mask is used, which causes some fan speed control modes
(pwmX_enable) to be incorrectly reported, and some modes to be
impossible to set.

[JD: add subject and description.]
Signed-off-by: Brian Carnes <bmcarnes@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/w83l786ng.c

@@ -510,7 +510,7 @@ store_pwm_enable(struct device *dev, struct device_attribute *attr,
 	mutex_lock(&data->update_lock);
 	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 	data->pwm_enable[nr] = val;
-	reg &= ~(0x02 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
+	reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 	reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 	mutex_unlock(&data->update_lock);
@@ -776,7 +776,7 @@ static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
 			    ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 			    ? 0 : 1;
 			data->pwm_enable[i] =
-			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 2) + 1;
+			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
 			data->pwm[i] = w83l786ng_read_value(client,
 			    W83L786NG_REG_PWM[i]);
 		}