iio: hid-sensors: Pressure: adjust scale and offset

Using units and unit exponent to calculate scale which is compliant
to IIO ABI.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/iio/pressure/hid-sensor-press.c b/drivers/iio/pressure/hid-sensor-press.c
index e0e6409aa94e..ff69da4443b8 100644
--- a/drivers/iio/pressure/hid-sensor-press.c
+++ b/drivers/iio/pressure/hid-sensor-press.c
@@ -36,6 +36,10 @@ struct press_state {
         struct hid_sensor_common common_attributes;
         struct hid_sensor_hub_attribute_info press_attr;
         u32 press_data;
+        int scale_pre_decml;
+        int scale_post_decml;
+        int scale_precision;
+        int value_offset;
 };
 
 /* Channel definitions */
@@ -102,12 +106,12 @@ static int press_read_raw(struct iio_dev *indio_dev,
                 ret_type = IIO_VAL_INT;
                 break;
         case IIO_CHAN_INFO_SCALE:
-                *val = press_state->press_attr.units;
-                ret_type = IIO_VAL_INT;
+                *val = press_state->scale_pre_decml;
+                *val2 = press_state->scale_post_decml;
+                ret_type = press_state->scale_precision;
                 break;
         case IIO_CHAN_INFO_OFFSET:
-                *val = hid_sensor_convert_exponent(
-                                press_state->press_attr.unit_expo);
+                *val = press_state->value_offset;
                 ret_type = IIO_VAL_INT;
                 break;
         case IIO_CHAN_INFO_SAMP_FREQ:
@@ -229,6 +233,11 @@ static int press_parse_report(struct platform_device *pdev,
         dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
                         st->press_attr.report_id);
 
+        st->scale_precision = hid_sensor_format_scale(
+                                HID_USAGE_SENSOR_PRESSURE,
+                                &st->press_attr,
+                                &st->scale_pre_decml, &st->scale_post_decml);
+
         /* Set Sensitivity field ids, when there is no individual modifier */
         if (st->common_attributes.sensitivity.index < 0) {
                 sensor_hub_input_get_attribute_info(hsdev,