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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 to the underlying data channel, then this parameter
gives the 3dB frequency of the filter in Hz. 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_voltageY_raw
What: /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_raw What: /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_raw
KernelVersion: 2.6.37 KernelVersion: 2.6.37
@ -880,6 +890,26 @@ Description:
met before an event is generated. If direction is not met before an event is generated. If direction is not
specified then this period applies to both directions. 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_rising_en
What: /sys/.../events/in_activity_still_thresh_falling_en What: /sys/.../events/in_activity_still_thresh_falling_en
What: /sys/.../events/in_activity_walking_thresh_rising_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_AVERAGE_RAW] = "mean_raw",
[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
= "filter_low_pass_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_SAMP_FREQ] = "sampling_frequency",
[IIO_CHAN_INFO_FREQUENCY] = "frequency", [IIO_CHAN_INFO_FREQUENCY] = "frequency",
[IIO_CHAN_INFO_PHASE] = "phase", [IIO_CHAN_INFO_PHASE] = "phase",

2
drivers/iio/industrialio-event.c
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@ -211,6 +211,8 @@ static const char * const iio_ev_info_text[] = {
[IIO_EV_INFO_VALUE] = "value", [IIO_EV_INFO_VALUE] = "value",
[IIO_EV_INFO_HYSTERESIS] = "hysteresis", [IIO_EV_INFO_HYSTERESIS] = "hysteresis",
[IIO_EV_INFO_PERIOD] = "period", [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) 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_QUADRATURE_CORRECTION_RAW,
IIO_CHAN_INFO_AVERAGE_RAW, IIO_CHAN_INFO_AVERAGE_RAW,
IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY, IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY,
IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY,
IIO_CHAN_INFO_SAMP_FREQ, IIO_CHAN_INFO_SAMP_FREQ,
IIO_CHAN_INFO_FREQUENCY, IIO_CHAN_INFO_FREQUENCY,
IIO_CHAN_INFO_PHASE, 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_VALUE,
IIO_EV_INFO_HYSTERESIS, IIO_EV_INFO_HYSTERESIS,
IIO_EV_INFO_PERIOD, IIO_EV_INFO_PERIOD,
IIO_EV_INFO_HIGH_PASS_FILTER_3DB,
IIO_EV_INFO_LOW_PASS_FILTER_3DB,
}; };
#define IIO_VAL_INT 1 #define IIO_VAL_INT 1