The delta velocity is defined as a piece-wise integration of
acceleration data. The delta velocity represents the linear velocity
change between two consecutive measurements and it
is measured in m / s (meters per second).
In order to track the total linear velocity change during a desired
period of time, simply sum-up the delta velocity samples acquired
during that time.
IIO currently does not offer a suitable channel type for this
type of measurements hence this patch adds it.
Signed-off-by: Ramona Bolboaca <ramona.bolboaca@xxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-bus-iio | 15 +++++++++++++++
drivers/iio/industrialio-core.c | 1 +
include/uapi/linux/iio/types.h | 1 +
tools/iio/iio_event_monitor.c | 2 ++
4 files changed, 19 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 1561c33b05a1..dab53d5d7dcf 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -293,6 +293,21 @@ Description:
angle samples acquired during that time.
Units after application of scale and offset are angles.
+What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_x_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_y_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_z_raw
+KernelVersion: 6.5
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ The linear velocity change between two consecutive samples on x,
+ y or z (may be arbitrarily assigned but should match other such
+ assignments on device).
+ In order to compute the total linear velocity change during a
+ desired period of time, the application should sum-up the delta
+ velocity samples acquired during that time.
+ Units after application of scale and offset are meters per
+ second.
+
What: /sys/bus/iio/devices/iio:deviceX/in_angl_raw
What: /sys/bus/iio/devices/iio:deviceX/in_anglY_raw
KernelVersion: 4.17
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 2e2fd0be2504..ba694b049629 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -90,6 +90,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_PHASE] = "phase",
[IIO_MASSCONCENTRATION] = "massconcentration",
[IIO_DELTA_ANGL] = "deltaangl",
+ [IIO_DELTA_VELOCITY] = "deltavelocity",
};
static const char * const iio_modifier_names[] = {
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 55666a17d311..9a341bd07702 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -48,6 +48,7 @@ enum iio_chan_type {
IIO_PHASE,
IIO_MASSCONCENTRATION,
IIO_DELTA_ANGL,
+ IIO_DELTA_VELOCITY,
};
enum iio_modifier {
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index 3505450060e6..7e6761612246 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -60,6 +60,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_PHASE] = "phase",
[IIO_MASSCONCENTRATION] = "massconcentration",
[IIO_DELTA_ANGL] = "deltaangl",
+ [IIO_DELTA_VELOCITY] = "deltavelocity",
};
static const char * const iio_ev_type_text[] = {
@@ -175,6 +176,7 @@ static bool event_is_known(struct iio_event_data *event)
case IIO_PHASE:
case IIO_MASSCONCENTRATION:
case IIO_DELTA_ANGL:
+ case IIO_DELTA_VELOCITY:
break;
default:
return false;
--
2.25.1
