}
EXPORT_SYMBOL_GPL(iio_read_channel_offset);
-int iio_read_channel_processed(struct iio_channel *chan, int *val)
+int iio_read_channel_processed_scale(struct iio_channel *chan, int *val,
+ unsigned int scale)
{
int ret;
if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) {
ret = iio_channel_read(chan, val, NULL,
IIO_CHAN_INFO_PROCESSED);
+ if (ret)
+ goto err_unlock;
+ *val *= scale;
} else {
ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
if (ret < 0)
goto err_unlock;
- ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1);
+ ret = iio_convert_raw_to_processed_unlocked(chan, *val, val,
+ scale);
}
err_unlock:
return ret;
}
+EXPORT_SYMBOL_GPL(iio_read_channel_processed_scale);
+
+int iio_read_channel_processed(struct iio_channel *chan, int *val)
+{
+ /* This is just a special case with scale factor 1 */
+ return iio_read_channel_processed_scale(chan, val, 1);
+}
EXPORT_SYMBOL_GPL(iio_read_channel_processed);
int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
*/
int iio_read_channel_processed(struct iio_channel *chan, int *val);
+/**
+ * iio_read_channel_processed_scale() - read and scale a processed value
+ * @chan: The channel being queried.
+ * @val: Value read back.
+ * @scale: Scale factor to apply during the conversion
+ *
+ * Returns an error code or 0.
+ *
+ * This function will read a processed value from a channel. This will work
+ * like @iio_read_channel_processed() but also scale with an additional
+ * scale factor while attempting to minimize any precision loss.
+ */
+int iio_read_channel_processed_scale(struct iio_channel *chan, int *val,
+ unsigned int scale);
+
/**
* iio_write_channel_attribute() - Write values to the device attribute.
* @chan: The channel being queried.