kernel: add kernel module for Sensirion SPS30 PMS

Adds into 4.19 backported kernel module from 5.1 for Sensirion SPS30
particulate matter sensor, for kernel 5.4 backported dependency fix.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

1 files changed, 144 insertions, 0 deletions

diff --git a/target/linux/generic/backport-4.19/499-v4.22-iio-add-IIO_MASSCONCENTRATION-channel-type.patch b/target/linux/generic/backport-4.19/499-v4.22-iio-add-IIO_MASSCONCENTRATION-channel-type.patch
new file mode 100644
index 0000000000..c214495f03
--- /dev/null
+++ b/target/linux/generic/backport-4.19/499-v4.22-iio-add-IIO_MASSCONCENTRATION-channel-type.patch
@@ -0,0 +1,144 @@
+From 17abc9ec68b73ddeb262a507a62421016b9c54d5 Mon Sep 17 00:00:00 2001
+From: Tomasz Duszynski <tduszyns@gmail.com>
+Date: Fri, 14 Dec 2018 19:28:01 +0100
+Subject: [PATCH] iio: add IIO_MASSCONCENTRATION channel type
+
+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, extra modifiers are introduced used for distinguishing
+between fine pm1, pm2p5 and coarse pm4, pm10 particle measurements, i.e
+IIO_MOD_PM1, IIO_MOD_PM25 and IIO_MOD_PM4, IIO_MOD_PM10.
+
+pmX consists of particles with aerodynamic diameter less or equal to
+X micrometers.
+
+Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
+Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
+Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
+---
+ Documentation/ABI/testing/sysfs-bus-iio | 17 ++++++++++++++++-
+ drivers/iio/industrialio-core.c         |  5 +++++
+ include/uapi/linux/iio/types.h          |  5 +++++
+ tools/iio/iio_event_monitor.c           | 10 ++++++++++
+ 4 files changed, 36 insertions(+), 1 deletion(-)
+
+diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
+index 8127a08e366d..67fd88bf7910 100644
+--- a/Documentation/ABI/testing/sysfs-bus-iio
++++ b/Documentation/ABI/testing/sysfs-bus-iio
+@@ -1684,4 +1684,19 @@ KernelVersion:	4.18
+ Contact:	linux-iio@vger.kernel.org
+ 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_pm1_input
++What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm1_input
++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_pm4_input
++What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm4_input
++What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm10_input
++What:		/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm10_input
++KernelVersion:	4.22
++Contact:	linux-iio@vger.kernel.org
++Description:
++		Mass concentration reading of particulate matter in ug / m3.
++		pmX consists of particles with aerodynamic diameter less or
++		equal to X micrometers.
+diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
+index 4f5cd9f60870..4700fd5d8c90 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 +128,10 @@ static const char * const iio_modifier_names[] = {
+ 	[IIO_MOD_Q] = "q",
+ 	[IIO_MOD_CO2] = "co2",
+ 	[IIO_MOD_VOC] = "voc",
++	[IIO_MOD_PM1] = "pm1",
++	[IIO_MOD_PM2P5] = "pm2p5",
++	[IIO_MOD_PM4] = "pm4",
++	[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..c59adac24b1c 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 +88,10 @@ enum iio_modifier {
+ 	IIO_MOD_VOC,
+ 	IIO_MOD_LIGHT_UV,
+ 	IIO_MOD_LIGHT_DUV,
++	IIO_MOD_PM1,
++	IIO_MOD_PM2P5,
++	IIO_MOD_PM4,
++	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..f6b8003fbe3c 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 +116,10 @@ static const char * const iio_modifier_names[] = {
+ 	[IIO_MOD_Q] = "q",
+ 	[IIO_MOD_CO2] = "co2",
+ 	[IIO_MOD_VOC] = "voc",
++	[IIO_MOD_PM1] = "pm1",
++	[IIO_MOD_PM2P5] = "pm2p5",
++	[IIO_MOD_PM4] = "pm4",
++	[IIO_MOD_PM10] = "pm10",
+ };
+ 
+ static bool event_is_known(struct iio_event_data *event)
+@@ -156,6 +161,7 @@ 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 +206,10 @@ 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_PM1:
++	case IIO_MOD_PM2P5:
++	case IIO_MOD_PM4:
++	case IIO_MOD_PM10:
+ 		break;
+ 	default:
+ 		return false;