Commit 45b77828 authored by Jonathan Cameron's avatar Jonathan Cameron
Browse files

iio:event: Add timeout event info type 



For adaptive threshold events, the current value is compared with a
(typically) low pass filtered version of the same signal that slowly
tracks large scale changes.  However, sometimes a step change can
result in a large lag before the low pass filtered version begins
to track the signal again.  Timeouts can be used to made an
instantaneous 'correction'.  Documentation of this attribute
is added in a later patch.

Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarAlexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210314181511.531414-11-jic23@kernel.org
parent d5723c67

drivers/iio/industrialio-event.c

+1 −0
Original line number Diff line number Diff line
@@ -245,6 +245,7 @@ static const char * const iio_ev_info_text[] = { 
	[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",

	[IIO_EV_INFO_TIMEOUT] = "timeout",

};



static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr)

include/linux/iio/types.h

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ enum iio_event_info { 
	IIO_EV_INFO_PERIOD,

	IIO_EV_INFO_HIGH_PASS_FILTER_3DB,

	IIO_EV_INFO_LOW_PASS_FILTER_3DB,

	IIO_EV_INFO_TIMEOUT,

};



#define IIO_VAL_INT 1