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Commit 3f7f642b authored by Martin Fuzzey's avatar Martin Fuzzey Committed by Jonathan Cameron
Browse files

iio: core: add high pass filter attributes 



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: default avatarMartin Fuzzey <mfuzzey@parkeon.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 2a17698c

Documentation/ABI/testing/sysfs-bus-iio

+30 −0
Original line number Diff line number Diff line
@@ -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

drivers/iio/industrialio-core.c

+2 −0
Original line number Diff line number Diff line
@@ -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",

drivers/iio/industrialio-event.c

+2 −0
Original line number Diff line number Diff line
@@ -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)

include/linux/iio/iio.h

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

include/linux/iio/types.h

+2 −0
Original line number Diff line number Diff line
@@ -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