linux-kernel - [PATCH v2 1/2] iio: Implement counter channel type and info constants

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Message-Id: <bd7044c5088c8f0d445d236581de9b19c806bbfc.1473877757.git.vilhelm.gray@gmail.com>
Date:   Wed, 14 Sep 2016 15:24:30 -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 v2 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 the counter
subdirectory and 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.gray@...il.com>
---
 drivers/iio/Kconfig             | 1 +
 drivers/iio/Makefile            | 1 +
 drivers/iio/counter/Kconfig     | 8 ++++++++
 drivers/iio/counter/Makefile    | 6 ++++++
 drivers/iio/industrialio-core.c | 3 +++
 include/linux/iio/iio.h         | 1 +
 include/uapi/linux/iio/types.h  | 2 ++
 7 files changed, 22 insertions(+)
 create mode 100644 drivers/iio/counter/Kconfig
 create mode 100644 drivers/iio/counter/Makefile

diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 6743b18..574d1fb 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -73,6 +73,7 @@ source "drivers/iio/adc/Kconfig"
 source "drivers/iio/amplifiers/Kconfig"
 source "drivers/iio/chemical/Kconfig"
 source "drivers/iio/common/Kconfig"
+source "drivers/iio/counter/Kconfig"
 source "drivers/iio/dac/Kconfig"
 source "drivers/iio/dummy/Kconfig"
 source "drivers/iio/frequency/Kconfig"
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index 87e4c43..77b2000 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -18,6 +18,7 @@ obj-y += amplifiers/
 obj-y += buffer/
 obj-y += chemical/
 obj-y += common/
+obj-y += counter/
 obj-y += dac/
 obj-y += dummy/
 obj-y += gyro/
diff --git a/drivers/iio/counter/Kconfig b/drivers/iio/counter/Kconfig
new file mode 100644
index 0000000..95a7a0df
--- /dev/null
+++ b/drivers/iio/counter/Kconfig
@@ -0,0 +1,8 @@
+#
+# Counter devices
+#
+# When adding new entries keep the list in alphabetical order
+
+menu "Counters"
+
+endmenu
diff --git a/drivers/iio/counter/Makefile b/drivers/iio/counter/Makefile
new file mode 100644
index 0000000..c4dfa50
--- /dev/null
+++ b/drivers/iio/counter/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for IIO counter devices
+#
+
+# When adding new entries keep the list in alphabetical order
+
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