From a269b9a0a27675c34c62c4e20c4ffb62054cd51a Mon Sep 17 00:00:00 2001
From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Sat, 19 Apr 2014 00:22:00 +0100
Subject: [PATCH] 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>
---
drivers/iio/pressure/hid-sensor-press.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/pressure/hid-sensor-press.c b/drivers/iio/pressure/hid-sensor-press.c
index e0e6409aa94e3..ff69da4443b83 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,
--
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