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: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210314181511.531414-11-jic23@kernel.org

diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 1b3a15bc75fe0af5548838e3311ea1bf63a06746..d0732eac0f0aceefefef3e433da9abaf15dae097 100644 (file)
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -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)

diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 5aa7f66d434524e46f0a32b5f6ac52c95210677b..84b3f8175cc6bb82ebbdbdf959ae880d9e65e8c3 100644 (file)
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -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