iio: Add modifiers for ethanol and H2 gases

Add ethanol and H2 gas modifiers:
* IIO_MOD_ETHANOL
* IIO_MOD_H2
Signed-off-by: Andreas Brauchli <andreas.brauchli@sensirion.com>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/ABI/testing/sysfs-bus-iio

@@ -1554,6 +1554,10 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_co2_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_co2_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_ethanol_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_ethanol_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_h2_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_h2_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_voc_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentrationX_voc_raw
 KernelVersion:	4.3

include/uapi/linux/iio/types.h

@@ -92,6 +92,8 @@ enum iio_modifier {
 	IIO_MOD_PM2P5,
 	IIO_MOD_PM4,
 	IIO_MOD_PM10,
+	IIO_MOD_ETHANOL,
+	IIO_MOD_H2,
 };
 
 enum iio_event_type {

tools/iio/iio_event_monitor.c

@@ -115,6 +115,8 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_I] = "i",
 	[IIO_MOD_Q] = "q",
 	[IIO_MOD_CO2] = "co2",
+	[IIO_MOD_ETHANOL] = "ethanol",
+	[IIO_MOD_H2] = "h2",
 	[IIO_MOD_VOC] = "voc",
 	[IIO_MOD_PM1] = "pm1",
 	[IIO_MOD_PM2P5] = "pm2p5",
@@ -205,6 +207,8 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_MOD_I:
 	case IIO_MOD_Q:
 	case IIO_MOD_CO2:
+	case IIO_MOD_ETHANOL:
+	case IIO_MOD_H2:
 	case IIO_MOD_VOC:
 	case IIO_MOD_PM1:
 	case IIO_MOD_PM2P5: