[PATCH] iio: hid-sensor-prox: Fix scale not correct issue

[Ye Xiang]

Currently, the proxy sensor scale is zero because it just return the
exponent directly. To fix this issue, this patch use
hid_sensor_format_scale to process the scale first then return the
output.

Signed-off-by: Ye Xiang <xiang...@intel.com>
---
 drivers/iio/light/hid-sensor-prox.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/light/hid-sensor-prox.c 
b/drivers/iio/light/hid-sensor-prox.c
index 4ab285a418d5..4abcfe48f1d4 100644
--- a/drivers/iio/light/hid-sensor-prox.c
+++ b/drivers/iio/light/hid-sensor-prox.c
@@ -23,6 +23,9 @@ struct prox_state {
        struct hid_sensor_common common_attributes;
        struct hid_sensor_hub_attribute_info prox_attr;
        u32 human_presence;
+       int scale_pre_decml;
+       int scale_post_decml;
+       int scale_precision;
 };
 
 static const u32 prox_sensitivity_addresses[] = {
@@ -98,8 +101,9 @@ static int prox_read_raw(struct iio_dev *indio_dev,
                ret_type = IIO_VAL_INT;
                break;
        case IIO_CHAN_INFO_SCALE:
-               *val = prox_state->prox_attr.units;
-               ret_type = IIO_VAL_INT;
+               *val = prox_state->scale_pre_decml;
+               *val2 = prox_state->scale_post_decml;
+               ret_type = prox_state->scale_precision;
                break;
        case IIO_CHAN_INFO_OFFSET:
                *val = hid_sensor_convert_exponent(
@@ -221,6 +225,11 @@ static int prox_parse_report(struct platform_device *pdev,
        dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
                        st->prox_attr.report_id);
 
+       st->scale_precision = hid_sensor_format_scale(
+                               hsdev->usage,
+                               &st->prox_attr,
+                               &st->scale_pre_decml, &st->scale_post_decml);
+
        return ret;
 }
 
-- 
2.17.1