Add new channel type support for phase.
This channel may be used by Time-of-flight sensors to express the
phase difference between emitted and received signals. Those sensor
will then use the phase shift of return signals to approximate the
distance to objects.
Signed-off-by: Mathieu Othacehe <m.othacehe@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++
drivers/iio/industrialio-core.c | 1 +
include/uapi/linux/iio/types.h | 1 +
tools/iio/iio_event_monitor.c | 2 ++
4 files changed, 11 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index c7353030670a..c9cfa833cf47 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1675,3 +1675,10 @@ KernelVersion: 4.12
Contact: linux-iio@xxxxxxxxxxxxxxx
Description:
Raw counter device counters direction for channel Y.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_phaseY_raw
+KernelVersion: 4.18
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ Raw (unscaled) phase difference reading from channel Y
+ that can be processed to radians.
\ No newline at end of file
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index ed1b3ebade94..a16ad5a4ab0c 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -86,6 +86,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_INDEX] = "index",
[IIO_GRAVITY] = "gravity",
[IIO_POSITIONRELATIVE] = "positionrelative",
+ [IIO_PHASE] = "phase",
};
static const char * const iio_modifier_names[] = {
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 033c7d28924e..e4df3cc268db 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -45,6 +45,7 @@ enum iio_chan_type {
IIO_INDEX,
IIO_GRAVITY,
IIO_POSITIONRELATIVE,
+ IIO_PHASE,
};
enum iio_modifier {
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index 148f69dfae75..f478f5558720 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -59,6 +59,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_UVINDEX] = "uvindex",
[IIO_GRAVITY] = "gravity",
[IIO_POSITIONRELATIVE] = "positionrelative",
+ [IIO_PHASE] = "phase",
};
static const char * const iio_ev_type_text[] = {
@@ -153,6 +154,7 @@ static bool event_is_known(struct iio_event_data *event)
case IIO_UVINDEX:
case IIO_GRAVITY:
case IIO_POSITIONRELATIVE:
+ case IIO_PHASE:
break;
default:
return false;
--
2.17.1
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