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iio: core: add high pass filter attributes

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Add a high pass filter attribute for measurements
(like the existing low pass)

Also add both high and low pass attributes for events.

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Martin Fuzzey 2015-05-13 12:26:42 +02:00 committed by Jonathan Cameron
parent 2a17698c0e
commit 3f7f642b9b
5 changed files with 37 additions and 0 deletions
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30
Documentation/ABI/testing/sysfs-bus-iio
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@ -420,6 +420,16 @@ Description:
to the underlying data channel, then this parameter
gives the 3dB frequency of the filter in Hz.
What: /sys/.../in_accel_filter_high_pass_3db_frequency
What: /sys/.../in_anglvel_filter_high_pass_3db_frequency
What: /sys/.../in_magn_filter_high_pass_3db_frequency
KernelVersion: 4.2
Contact: linux-iio@vger.kernel.org
Description:
If a known or controllable high pass filter is applied
to the underlying data channel, then this parameter
gives the 3dB frequency of the filter in Hz.
What: /sys/bus/iio/devices/iio:deviceX/out_voltageY_raw
What: /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_raw
KernelVersion: 2.6.37
@ -880,6 +890,26 @@ Description:
met before an event is generated. If direction is not
specified then this period applies to both directions.
What: /sys/.../events/in_accel_thresh_rising_low_pass_filter_3db
What: /sys/.../events/in_anglvel_thresh_rising_low_pass_filter_3db
What: /sys/.../events/in_magn_thresh_rising_low_pass_filter_3db
KernelVersion: 4.2
Contact: linux-iio@vger.kernel.org
Description:
If a low pass filter can be applied to the event generation
this property gives its 3db frequency in Hz.
A value of zero disables the filter.
What: /sys/.../events/in_accel_thresh_rising_high_pass_filter_3db
What: /sys/.../events/in_anglvel_thresh_rising_high_pass_filter_3db
What: /sys/.../events/in_magn_thresh_rising_high_pass_filter_3db
KernelVersion: 4.2
Contact: linux-iio@vger.kernel.org
Description:
If a high pass filter can be applied to the event generation
this property gives its 3db frequency in Hz.
A value of zero disables the filter.
What: /sys/.../events/in_activity_still_thresh_rising_en
What: /sys/.../events/in_activity_still_thresh_falling_en
What: /sys/.../events/in_activity_walking_thresh_rising_en

2
drivers/iio/industrialio-core.c
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@ -117,6 +117,8 @@ static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
= "filter_low_pass_3db_frequency",
[IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY]
= "filter_high_pass_3db_frequency",
[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
[IIO_CHAN_INFO_FREQUENCY] = "frequency",
[IIO_CHAN_INFO_PHASE] = "phase",

2
drivers/iio/industrialio-event.c
View File

@ -211,6 +211,8 @@ static const char * const iio_ev_info_text[] = {
[IIO_EV_INFO_VALUE] = "value",
[IIO_EV_INFO_HYSTERESIS] = "hysteresis",
[IIO_EV_INFO_PERIOD] = "period",
[IIO_EV_INFO_HIGH_PASS_FILTER_3DB] = "high_pass_filter_3db",
[IIO_EV_INFO_LOW_PASS_FILTER_3DB] = "low_pass_filter_3db",
};
static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr)

1
include/linux/iio/iio.h
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@ -32,6 +32,7 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW,
IIO_CHAN_INFO_AVERAGE_RAW,
IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY,
IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY,
IIO_CHAN_INFO_SAMP_FREQ,
IIO_CHAN_INFO_FREQUENCY,
IIO_CHAN_INFO_PHASE,

2
include/linux/iio/types.h
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@ -17,6 +17,8 @@ enum iio_event_info {
IIO_EV_INFO_VALUE,
IIO_EV_INFO_HYSTERESIS,
IIO_EV_INFO_PERIOD,
IIO_EV_INFO_HIGH_PASS_FILTER_3DB,
IIO_EV_INFO_LOW_PASS_FILTER_3DB,
};
#define IIO_VAL_INT 1