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iio: hid-sensors: Compass 3D: 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>
This commit is contained in:
Srinivas Pandruvada 2014-04-19 00:22:00 +01:00 committed by Jonathan Cameron
parent 36783d09f1
commit 92463fdab5
1 changed files with 13 additions and 4 deletions
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17
drivers/iio/magnetometer/hid-sensor-magn-3d.c
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@ -42,6 +42,10 @@ struct magn_3d_state {
struct hid_sensor_common common_attributes;
struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
u32 magn_val[MAGN_3D_CHANNEL_MAX];
int scale_pre_decml;
int scale_post_decml;
int scale_precision;
int value_offset;
};
static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
@ -124,12 +128,12 @@ static int magn_3d_read_raw(struct iio_dev *indio_dev,
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = magn_state->magn[CHANNEL_SCAN_INDEX_X].units;
ret_type = IIO_VAL_INT;
*val = magn_state->scale_pre_decml;
*val2 = magn_state->scale_post_decml;
ret_type = magn_state->scale_precision;
break;
case IIO_CHAN_INFO_OFFSET:
*val = hid_sensor_convert_exponent(
magn_state->magn[CHANNEL_SCAN_INDEX_X].unit_expo);
*val = magn_state->value_offset;
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
@ -263,6 +267,11 @@ static int magn_3d_parse_report(struct platform_device *pdev,
st->magn[1].index, st->magn[1].report_id,
st->magn[2].index, st->magn[2].report_id);
st->scale_precision = hid_sensor_format_scale(
HID_USAGE_SENSOR_COMPASS_3D,
&st->magn[CHANNEL_SCAN_INDEX_X],
&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,