From: Irina Tirdea Date: Wed, 29 Apr 2015 18:16:39 +0000 (+0300) Subject: iio: core: Introduce IIO_CHAN_INFO_OVERSAMPLING_RATIO X-Git-Tag: v4.14-rc1~5163^2~256^2~98 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=faaa44955dedc661f083636d816af90975a359ee;p=platform%2Fkernel%2Flinux-rpi.git 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 Signed-off-by: Jonathan Cameron --- diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 866b4ec4..e46c71f 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -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 [_name]_oversampling_ratio + measurements and return the average value as output data. Each + value resulted from [_name]_oversampling_ratio measurements + is considered as one sample for [_name]_sampling_frequency. diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 7c98bc1..dfa81db 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -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", }; /** diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index b1e46ae..058441d 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -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 {