linux-kernel - [PATCH 1/2] iio: Add support for waveform output

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Date:	Wed, 26 Nov 2014 15:45:40 -0600
From:	George McCollister <george.mccollister@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	George McCollister <george.mccollister@...il.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Sebastian Reichel <sre@...ian.org>,
	Harald Geyer <harald@...ib.org>,
	Reyad Attiyat <reyad.attiyat@...il.com>,
	Daniel Baluta <daniel.baluta@...el.com>,
	linux-api@...r.kernel.org (open list:ABI/API),
	linux-kernel@...r.kernel.org (open list),
	linux-iio@...r.kernel.org (open list:IIO SUBSYSTEM AND...),
	devel@...verdev.osuosl.org (open list:STAGING SUBSYSTEM)
Subject: [PATCH 1/2] iio: Add support for waveform output

Output can be held high or low for a specified period of time.
Support for waveform capture could be added in the future.

Signed-off-by: George McCollister <george.mccollister@...il.com>
---
 Documentation/ABI/testing/sysfs-bus-iio               | 7 +++++++
 drivers/iio/industrialio-core.c                       | 3 +++
 drivers/staging/iio/Documentation/iio_event_monitor.c | 2 ++
 include/linux/iio/types.h                             | 5 ++++-
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index d760b02..47df169 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1028,3 +1028,10 @@ Contact:	linux-iio@...r.kernel.org
 Description:
 		Raw value of rotation from true/magnetic north measured with
 		or without compensation from tilt sensors.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_waveformY_hightime_raw
+What:		/sys/bus/iio/devices/iio:deviceX/out_waveformY_lowtime_raw
+KernelVersion:	3.18
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Raw value of time for output to be held high or low.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index af3e76d..343e784 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -70,6 +70,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_CCT] = "cct",
 	[IIO_PRESSURE] = "pressure",
 	[IIO_HUMIDITYRELATIVE] = "humidityrelative",
+	[IIO_WAVEFORM] = "waveform",
 };
 
 static const char * const iio_modifier_names[] = {
@@ -91,6 +92,8 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_NORTH_TRUE] = "from_north_true",
 	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
 	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
+	[IIO_MOD_HIGHTIME] = "hightime",
+	[IIO_MOD_LOWTIME] = "lowtime",
 };
 
 /* relies on pairs of these shared then separate */
diff --git a/drivers/staging/iio/Documentation/iio_event_monitor.c b/drivers/staging/iio/Documentation/iio_event_monitor.c
index 569d6f8..690f261 100644
--- a/drivers/staging/iio/Documentation/iio_event_monitor.c
+++ b/drivers/staging/iio/Documentation/iio_event_monitor.c
@@ -49,6 +49,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_CCT] = "cct",
 	[IIO_PRESSURE] = "pressure",
 	[IIO_HUMIDITYRELATIVE] = "humidityrelative",
+	[IIO_WAVEFORM] = "waveform",
 };
 
 static const char * const iio_ev_type_text[] = {
@@ -108,6 +109,7 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_CCT:
 	case IIO_PRESSURE:
 	case IIO_HUMIDITYRELATIVE:
+	case IIO_WAVEFORM:
 		break;
 	default:
 		return false;
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 4a2af8a..d3b0af1 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -30,6 +30,7 @@ enum iio_chan_type {
 	IIO_CCT,
 	IIO_PRESSURE,
 	IIO_HUMIDITYRELATIVE,
+	IIO_WAVEFORM,
 };
 
 enum iio_modifier {
@@ -59,7 +60,9 @@ enum iio_modifier {
 	IIO_MOD_NORTH_MAGN,
 	IIO_MOD_NORTH_TRUE,
 	IIO_MOD_NORTH_MAGN_TILT_COMP,
-	IIO_MOD_NORTH_TRUE_TILT_COMP
+	IIO_MOD_NORTH_TRUE_TILT_COMP,
+	IIO_MOD_HIGHTIME,
+	IIO_MOD_LOWTIME,
 };
 
 enum iio_event_type {
-- 
2.1.0

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