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_CHAN_INFO_FLAGS: Counter flag states (e.g. underflows, overflows,
errors, etc.)
IIO_CHAN_INFO_DIRECTION: Set high when counting up and reset low when
counting down
IIO_CHAN_INFO_INDEX: Set high when index input is at active level
IIO_CHAN_INFO_MODE: Count value encoding, counter range setting,
quadrature phase mode, etc.
IIO_CHAN_INFO_PRESET: Counter preset value
IIO_CHAN_INFO_PRESET_EN: Set high to preset counter on signal (e.g.
index input at active level)
Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
---
drivers/iio/industrialio-core.c | 7 +++++++
include/linux/iio/iio.h | 6 ++++++
include/uapi/linux/iio/types.h | 1 +
3 files changed, 14 insertions(+)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 0528a0c..bfdb09d 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -81,6 +81,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_PH] = "ph",
[IIO_UVINDEX] = "uvindex",
[IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
+ [IIO_COUNT] = "count",
};
static const char * const iio_modifier_names[] = {
@@ -151,6 +152,12 @@ 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_FLAGS] = "flags",
+ [IIO_CHAN_INFO_DIRECTION] = "direction",
+ [IIO_CHAN_INFO_INDEX] = "index",
+ [IIO_CHAN_INFO_MODE] = "mode",
+ [IIO_CHAN_INFO_PRESET] = "preset",
+ [IIO_CHAN_INFO_PRESET_EN] = "preset_enable",
};
/**
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index b4a0679..13543fd 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -46,6 +46,12 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_DEBOUNCE_TIME,
IIO_CHAN_INFO_CALIBEMISSIVITY,
IIO_CHAN_INFO_OVERSAMPLING_RATIO,
+ IIO_CHAN_INFO_FLAGS,
+ IIO_CHAN_INFO_DIRECTION,
+ IIO_CHAN_INFO_INDEX,
+ IIO_CHAN_INFO_MODE,
+ IIO_CHAN_INFO_PRESET,
+ IIO_CHAN_INFO_PRESET_EN,
};
enum iio_shared_by {
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 22e5e58..e227039 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -40,6 +40,7 @@ enum iio_chan_type {
IIO_PH,
IIO_UVINDEX,
IIO_ELECTRICALCONDUCTIVITY,
+ IIO_COUNT,
};
enum iio_modifier {
--
2.7.3
--
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