iio:magnetometer:mag3110: Scale factor missing for temperature

temperature is reported in milli-Celsius
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/magnetometer/mag3110.c

@@ -183,9 +183,18 @@ static int mag3110_read_raw(struct iio_dev *indio_dev,
 			return -EINVAL;
 		}
 	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_MAGN:
 			*val = 0;
 			*val2 = 1000;
 			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_TEMP:
+			*val = 1000;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT;
 		*val = mag3110_samp_freq[i][0];
@@ -270,7 +279,8 @@ static const struct iio_chan_spec mag3110_channels[] = {
 	MAG3110_CHANNEL(Z, 2),
 	{
 		.type = IIO_TEMP,
-		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE),
 		.scan_index = 3,
 		.scan_type = {
 			.sign = 's',