[PATCH v3 1/2] iio: Implement counter channel type and info constants

[William Breathitt Gray]

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: Set high when index input is at active level
  IIO_CHAN_INFO_PRESET: Counter preset value

Signed-off-by: William Breathitt Gray <vilhelm.g...@gmail.com>
---
 drivers/iio/industrialio-core.c | 3 +++
 include/linux/iio/iio.h         | 1 +
 include/uapi/linux/iio/types.h  | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 0528a0c..42d8c8b 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