+static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
+ int val)
+{
+ int i;
+ const int *avail = data->chip_info->oversampling_temp_avail;
+ const int n = data->chip_info->num_oversampling_temp_avail;
+
+ for (i = 0; i < n; i++) {
+ if (avail[i] == val) {
+ data->oversampling_temp = ilog2(val);
+
+ return data->chip_info->chip_config(data);
+ }
+ }
+ return -EINVAL;
+}
+
+static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
+ int val)
+{
+ int i;
+ const int *avail = data->chip_info->oversampling_press_avail;
+ const int n = data->chip_info->num_oversampling_press_avail;
+
+ for (i = 0; i < n; i++) {
+ if (avail[i] == val) {
+ data->oversampling_press = ilog2(val);
+
+ return data->chip_info->chip_config(data);
+ }
+ }
+ return -EINVAL;
+}
+
+static int bmp280_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ int ret = 0;
+ struct bmp280_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ mutex_lock(&data->lock);
+ switch (chan->type) {
+ case IIO_PRESSURE:
+ ret = bmp280_write_oversampling_ratio_press(data, val);
+ break;
+ case IIO_TEMP:
+ ret = bmp280_write_oversampling_ratio_temp(data, val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ mutex_unlock(&data->lock);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static ssize_t bmp280_show_avail(char *buf, const int *vals, const int n)
+{
+ size_t len = 0;
+ int i;
+
+ for (i = 0; i < n; i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", vals[i]);
+
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static ssize_t bmp280_show_temp_oversampling_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
+
+ return bmp280_show_avail(buf, data->chip_info->oversampling_temp_avail,
+ data->chip_info->num_oversampling_temp_avail);
+}
+
+static ssize_t bmp280_show_press_oversampling_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
+
+ return bmp280_show_avail(buf, data->chip_info->oversampling_press_avail,
+ data->chip_info->num_oversampling_press_avail);
+}
+
+static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available,
+ S_IRUGO, bmp280_show_temp_oversampling_avail, NULL, 0);
+
+static IIO_DEVICE_ATTR(in_pressure_oversampling_ratio_available,
+ S_IRUGO, bmp280_show_press_oversampling_avail, NULL, 0);
+
+static struct attribute *bmp280_attributes[] = {
+ &iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
+ &iio_dev_attr_in_pressure_oversampling_ratio_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group bmp280_attrs_group = {
+ .attrs = bmp280_attributes,
+};
+