Quadrature encoders, such as rotary encoders and linear encoders, are
devices which are capable of encoding the relative position and
direction of motion of a shaft. This patch introduces several IIO
constants for supporting quadrature encoder counter devices.
IIO_COUNT: Current count (main data provided by the counter device)
IIO_INDEX: Counter device index value
IIO_CHAN_INFO_PRESET: Counter preset value
Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-bus-iio | 28 ++++++++++++++++++++++++++++
drivers/iio/industrialio-core.c | 3 +++
include/linux/iio/iio.h | 1 +
include/uapi/linux/iio/types.h | 2 ++
4 files changed, 34 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index fee35c0..be66a41 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1579,3 +1579,31 @@ Contact: linux-iio@xxxxxxxxxxxxxxx
Description:
Raw (unscaled no offset etc.) electric conductivity reading that
can be processed to siemens per meter.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_countY_raw
+KernelVersion: 4.9
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ Raw counter device counts from channel Y. For quadrature
+ counters, division by an available [Y]_scale results in the
+ counts of a single quadrature signal phase from channel Y.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_countY_scale
+KernelVersion: 4.9
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ If a scale value is available for channel Y, it is provided by
+ this attribute.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_countY_preset
+KernelVersion: 4.9
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ If the counter device supports preset registers, the preset
+ count for channel Y is provided by this attribute.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_indexY_raw
+KernelVersion: 4.9
+Contact: linux-iio@xxxxxxxxxxxxxxx
+Description:
+ Raw counter device index value from channel Y.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index fc340ed..ed175a2 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -81,6 +81,8 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_PH] = "ph",
[IIO_UVINDEX] = "uvindex",
[IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
+ [IIO_COUNT] = "count",
+ [IIO_INDEX] = "index",
};
static const char * const iio_modifier_names[] = {
@@ -151,6 +153,7 @@ static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
+ [IIO_CHAN_INFO_PRESET] = "preset",
};
/**
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index b4a0679..7dc86d1 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -46,6 +46,7 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_DEBOUNCE_TIME,
IIO_CHAN_INFO_CALIBEMISSIVITY,
IIO_CHAN_INFO_OVERSAMPLING_RATIO,
+ IIO_CHAN_INFO_PRESET,
};
enum iio_shared_by {
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 22e5e58..e54d14a 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -40,6 +40,8 @@ enum iio_chan_type {
IIO_PH,
IIO_UVINDEX,
IIO_ELECTRICALCONDUCTIVITY,
+ IIO_COUNT,
+ IIO_INDEX,
};
enum iio_modifier {
--
2.7.3
--
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