staging: iio: tsl2x7x: add range checking to three sysfs attributes

The sysfs attributes in_illuminance0_target_input,
in_illuminance0_calibrate, and in_proximity0_calibrate did not have
proper range checking in place so this patch adds the correct range
checks.
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/light/tsl2x7x.c

@@ -814,15 +814,13 @@ static ssize_t in_illuminance0_target_input_store(struct device *dev,
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct tsl2X7X_chip *chip = iio_priv(indio_dev);
-	unsigned long value;
+	u16 value;
 	int ret;
 
-	if (kstrtoul(buf, 0, &value))
+	if (kstrtou16(buf, 0, &value))
 		return -EINVAL;
 
-	if (value)
 	chip->settings.als_cal_target = value;
-
 	ret = tsl2x7x_invoke_change(indio_dev);
 	if (ret < 0)
 		return ret;
@@ -838,14 +836,12 @@ static ssize_t in_illuminance0_calibrate_store(struct device *dev,
 	bool value;
 	int ret;
 
-	if (strtobool(buf, &value))
+	if (kstrtobool(buf, &value) || !value)
 		return -EINVAL;
 
-	if (value) {
 	ret = tsl2x7x_als_calibrate(indio_dev);
 	if (ret < 0)
 		return ret;
-	}
 
 	ret = tsl2x7x_invoke_change(indio_dev);
 	if (ret < 0)
@@ -932,14 +928,12 @@ static ssize_t in_proximity0_calibrate_store(struct device *dev,
 	bool value;
 	int ret;
 
-	if (strtobool(buf, &value))
+	if (kstrtobool(buf, &value) || !value)
 		return -EINVAL;
 
-	if (value) {
 	ret = tsl2x7x_prox_cal(indio_dev);
 	if (ret < 0)
 		return ret;
-	}
 
 	ret = tsl2x7x_invoke_change(indio_dev);
 	if (ret < 0)