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Commit faaa4495 authored by Irina Tirdea's avatar Irina Tirdea Committed by Jonathan Cameron
Browse files

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: default avatarIrina Tirdea <irina.tirdea@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 42a95584

Documentation/ABI/testing/sysfs-bus-iio

+12 −0
Original line number Diff line number Diff line
@@ -1375,3 +1375,15 @@ Description: 
		The emissivity ratio of the surface in the field of view of the

		contactless temperature sensor.  Emissivity varies from 0 to 1,

		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.

drivers/iio/industrialio-core.c

+1 −0
Original line number Diff line number Diff line
@@ -129,6 +129,7 @@ static const char * const iio_chan_info_postfix[] = { 
	[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",

	[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",

	[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",

	[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",

};



/**

include/linux/iio/iio.h

+1 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ enum iio_chan_info_enum { 
	IIO_CHAN_INFO_DEBOUNCE_COUNT,

	IIO_CHAN_INFO_DEBOUNCE_TIME,

	IIO_CHAN_INFO_CALIBEMISSIVITY,

	IIO_CHAN_INFO_OVERSAMPLING_RATIO,

};



enum iio_shared_by {