iio: accel: fxls8962af: Fix temperature calculation

commit 16038474e3a0263572f36326ef85057aaf341814 upstream.

According to spec temperature should be returned in milli degrees Celsius.
Add in_temp_scale to calculate from Celsius to milli Celsius.

Fixes: a3e0b51 ("iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers")
Cc: [email protected]
Reviewed-by: Marcelo Schmitt <[email protected]>
Signed-off-by: Sean Nyekjaer <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 39c86833f973d6b7d0fb5ae9ebd557e078a4cce5)

Author: sknsean

drivers/iio/accel/fxls8962af-core.c

@@ -20,6 +20,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/regmap.h>
+#include <linux/units.h>
 
 #include <linux/iio/buffer.h>
 #include <linux/iio/events.h>
@@ -434,8 +435,16 @@ static int fxls8962af_read_raw(struct iio_dev *indio_dev,
 		*val = FXLS8962AF_TEMP_CENTER_VAL;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
-		*val = 0;
-		return fxls8962af_read_full_scale(data, val2);
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = MILLIDEGREE_PER_DEGREE;
+			return IIO_VAL_INT;
+		case IIO_ACCEL:
+			*val = 0;
+			return fxls8962af_read_full_scale(data, val2);
+		default:
+			return -EINVAL;
+		}
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		return fxls8962af_read_samp_freq(data, val, val2);
 	default:
@@ -734,6 +743,7 @@ static const struct iio_event_spec fxls8962af_event[] = {
 	.type = IIO_TEMP, \
 	.address = FXLS8962AF_TEMP_OUT, \
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			      BIT(IIO_CHAN_INFO_SCALE) | \
 			      BIT(IIO_CHAN_INFO_OFFSET),\
 	.scan_index = -1, \
 	.scan_type = { \