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iio: core: Introduce IIO_CHAN_INFO_OVERSAMPLING_RATIO 

Some magnetometers can perform a number of repetitions in HW
for each measurement to increase accuracy. One example is
Bosch BMC150:
http://ae-bst.resource.bosch.com/media/products/dokumente/bmc150/BST-BMC150-DS000-04.pdf.

Introduce an interface to set the oversampling ratio
for these devices.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea 2015-04-29 21:16:39 +03:00 committed by Jonathan Cameron
parent 42a95584f3
commit faaa44955d
3 changed files with 14 additions and 0 deletions
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12
Documentation/ABI/testing/sysfs-bus-iio
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@ -1375,3 +1375,15 @@ Description:
The emissivity ratio of the surface in the field of view of the The emissivity ratio of the surface in the field of view of the
contactless temperature sensor. Emissivity varies from 0 to 1, contactless temperature sensor. Emissivity varies from 0 to 1,
with 1 being the emissivity of a black body. with 1 being the emissivity of a black body.
What: /sys/bus/iio/devices/iio:deviceX/in_magn_x_oversampling_ratio
What: /sys/bus/iio/devices/iio:deviceX/in_magn_y_oversampling_ratio
What: /sys/bus/iio/devices/iio:deviceX/in_magn_z_oversampling_ratio
KernelVersion: 4.2
Contact: linux-iio@vger.kernel.org
Description:
Hardware applied number of measurements for acquiring one
data point. The HW will do <type>[_name]_oversampling_ratio
measurements and return the average value as output data. Each
value resulted from <type>[_name]_oversampling_ratio measurements
is considered as one sample for <type>[_name]_sampling_frequency.

1
drivers/iio/industrialio-core.c
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@ -129,6 +129,7 @@ static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
}; };
/** /**

1
include/linux/iio/iio.h
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@ -44,6 +44,7 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_DEBOUNCE_COUNT, IIO_CHAN_INFO_DEBOUNCE_COUNT,
IIO_CHAN_INFO_DEBOUNCE_TIME, IIO_CHAN_INFO_DEBOUNCE_TIME,
IIO_CHAN_INFO_CALIBEMISSIVITY, IIO_CHAN_INFO_CALIBEMISSIVITY,
IIO_CHAN_INFO_OVERSAMPLING_RATIO,
}; };
enum iio_shared_by { enum iio_shared_by {