linux-kernel - [PATCH 1/3] iio: add IIO_MOD

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Message-ID: <20250206061521.2546108-2-Hermes.Zhang@axis.com>
Date: Thu, 6 Feb 2025 14:15:15 +0800
From: Hermes Zhang <Hermes.Zhang@...s.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <lars@...afoo.de>,
	<krzk+dt@...nel.org>
CC: <kernel@...s.com>, Hermes Zhang <Hermes.Zhang@...s.com>,
	<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] iio: add IIO_MOD_NOX modifier

Add modifier IIO_MOD_NOX for NOx concentration reporting. NOx (a generic
term for the mono-nitrogen oxides) are used in environment sensor as a
parameter to show the concentration in index format.

An example case: https://www.sensirion.com/media/documents/9F289B95/
6294DFFC/Info_Note_NOx_Index.pdf

Signed-off-by: Hermes Zhang <Hermes.Zhang@...s.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 2 ++
 drivers/iio/industrialio-core.c         | 1 +
 include/uapi/linux/iio/types.h          | 1 +
 tools/iio/iio_event_monitor.c           | 2 ++
 4 files changed, 6 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index f83bd6829285..c7d54dc1f226 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1898,6 +1898,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_o2_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_o2_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_voc_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_voc_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_nox_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_nox_raw
 KernelVersion:	4.3
 Contact:	linux-iio@...r.kernel.org
 Description:
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index a2117ad1337d..6a85688c9148 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -151,6 +151,7 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_PITCH] = "pitch",
 	[IIO_MOD_YAW] = "yaw",
 	[IIO_MOD_ROLL] = "roll",
+	[IIO_MOD_NOX] = "nox",
 };
 
 /* relies on pairs of these shared then separate */
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 12886d4465e4..f7dfc4c71495 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -108,6 +108,7 @@ enum iio_modifier {
 	IIO_MOD_ROLL,
 	IIO_MOD_LIGHT_UVA,
 	IIO_MOD_LIGHT_UVB,
+	IIO_MOD_NOX,
 };
 
 enum iio_event_type {
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index cccf62ea2b8f..51c6f753e7d4 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -138,6 +138,7 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_PITCH] = "pitch",
 	[IIO_MOD_YAW] = "yaw",
 	[IIO_MOD_ROLL] = "roll",
+	[IIO_MOD_NOX] = "nox",
 };
 
 static bool event_is_known(struct iio_event_data *event)
@@ -236,6 +237,7 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_MOD_PM4:
 	case IIO_MOD_PM10:
 	case IIO_MOD_O2:
+	case IIO_MOD_NOX:
 		break;
 	default:
 		return false;
-- 
2.45.2