[PATCH] IIO: hid-sensor-prox: add missing scale attribute

[Philipp Jungkamp <p.jungkamp@gmx.net>]

The hid-sensor-prox returned an empty string on sysfs in_proximity_scale
read. This is due to the the driver's scale never being initialized.

Try to query the scale of the HID sensor using hid_sensor_format_scale.

Signed-off-by: Philipp Jungkamp <p.jungkamp@gmx.net>
---
Hello,

up until now I've used the sensor directly through the buffered IIO interface,
ignoring the in_proximity_scale attribute. But while integrating it with
iio-sensor-proxy I noticed that a read on scale return an empty string,
breaking the code there.

Looking at the code in `hid-sensor-prox.c` it is fairly obvious that the scale
just wasn't being initialized. I now added the hid_sensor_format_scale call
similar to the ones found in e.g. `hid-sensor-als.c`.

Regards,
Philipp Jungkamp

 drivers/iio/light/hid-sensor-prox.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/light/hid-sensor-prox.c b/drivers/iio/light/hid-sensor-prox.c
index a47591e1bad9..aaf2ce6ed52c 100644
--- a/drivers/iio/light/hid-sensor-prox.c
+++ b/drivers/iio/light/hid-sensor-prox.c
@@ -227,6 +227,9 @@ 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(usage_id, &st->prox_attr,
+				&st->scale_pre_decml, &st->scale_post_decml);
+
 	return ret;
 }

--
2.41.0