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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 Original line Diff line number Diff line
@@ -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.

drivers/iio/industrialio-core.c

+1 −0
Original line number Original line 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_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",

};

};





/**

/**

include/linux/iio/iio.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -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 {