linux-kernel - [PATCH 1/2] iio: Implement counter channel type and info constants

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Date:   Wed,  7 Sep 2016 13:55:30 -0400
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH 1/2] iio: Implement counter channel type and info constants

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@...il.com>
---
 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