[PATCH 1/3] iio: add IIO_MASSCONCENTRATION channel type

[Tomasz Duszynski]

Measuring particulate matter in ug / m3 (micro-grams per cubic meter)
is de facto standard. Existing air quality sensors usually follow
this convention and are capable of returning measurements using
this unit.

IIO currently does not offer suitable channel type for this
type of measurements hence this patch adds this.

In addition, two modifiers are introduced used for distinguishing
between coarse (PM10) and fine particles (PM2p5) measurements, i.e
IIO_MOD_PM10 and IIO_MOD_PM2p5.

Signed-off-by: Tomasz Duszynski <tduszyns@xxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-bus-iio | 11 ++++++++++-
 drivers/iio/industrialio-core.c         |  3 +++
 include/uapi/linux/iio/types.h          |  3 +++
 tools/iio/iio_event_monitor.c           |  6 ++++++
 4 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 8127a08e366d..ce0ed140660d 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1684,4 +1684,13 @@ KernelVersion:	4.18
 Contact:	linux-iio@xxxxxxxxxxxxxxx
 Description:
 		Raw (unscaled) phase difference reading from channel Y
-		that can be processed to radians.
\ No newline at end of file
+		that can be processed to radians.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm2p5_input
+What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm2p5_input
+What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm10_input
+What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm10_input
+KernelVersion:	4.21
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Mass concentration reading of particulate matter in ug / m3.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index a062cfddc5af..2a9ef600c1fb 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -87,6 +87,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_GRAVITY]  = "gravity",
 	[IIO_POSITIONRELATIVE]  = "positionrelative",
 	[IIO_PHASE] = "phase",
+	[IIO_MASSCONCENTRATION] = "massconcentration",
 };
 
 static const char * const iio_modifier_names[] = {
@@ -127,6 +128,8 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_Q] = "q",
 	[IIO_MOD_CO2] = "co2",
 	[IIO_MOD_VOC] = "voc",
+	[IIO_MOD_PM2p5] = "pm2p5",
+	[IIO_MOD_PM10] = "pm10",
 };
 
 /* 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 92baabc103ac..465044b42af5 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -46,6 +46,7 @@ enum iio_chan_type {
 	IIO_GRAVITY,
 	IIO_POSITIONRELATIVE,
 	IIO_PHASE,
+	IIO_MASSCONCENTRATION,
 };
 
 enum iio_modifier {
@@ -87,6 +88,8 @@ enum iio_modifier {
 	IIO_MOD_VOC,
 	IIO_MOD_LIGHT_UV,
 	IIO_MOD_LIGHT_DUV,
+	IIO_MOD_PM2p5,
+	IIO_MOD_PM10,
 };
 
 enum iio_event_type {
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index ac2de6b7e89f..f0fcfeddba2b 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -60,6 +60,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_GRAVITY] = "gravity",
 	[IIO_POSITIONRELATIVE] = "positionrelative",
 	[IIO_PHASE] = "phase",
+	[IIO_MASSCONCENTRATION] = "massconcentration",
 };
 
 static const char * const iio_ev_type_text[] = {
@@ -115,6 +116,8 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_Q] = "q",
 	[IIO_MOD_CO2] = "co2",
 	[IIO_MOD_VOC] = "voc",
+	[IIO_MOD_PM2p5] = "pm2p5",
+	[IIO_MOD_PM10] = "pm10",
 };
 
 static bool event_is_known(struct iio_event_data *event)
@@ -156,6 +159,7 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_GRAVITY:
 	case IIO_POSITIONRELATIVE:
 	case IIO_PHASE:
+	case IIO_MASSCONCENTRATION:
 		break;
 	default:
 		return false;
@@ -200,6 +204,8 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_MOD_Q:
 	case IIO_MOD_CO2:
 	case IIO_MOD_VOC:
+	case IIO_MOD_PM2p5:
+	case IIO_MOD_PM10:
 		break;
 	default:
 		return false;
-- 
2.19.2