[PATCH v3 0/2] iio: chemical: atlas-ezo-sensor: add support for O2 sensor

[PATCH v3 0/2] iio: chemical: atlas-ezo-sensor: add support for O2 sensor

[Matt Ranostay]

Changes from v1:
* rebased on modifier changes for IIO_MOD_H2/ETHANOL string identifiers

Changes from v2:
* change in atlas_ezo_sanitize() to use memmove()

Matt Ranostay (2):
  iio: add IIO_MOD_O2 modifier
  iio: chemical: atlas-ezo-sensor: add support for O2 sensor

 Documentation/ABI/testing/sysfs-bus-iio |  2 +
 drivers/iio/chemical/atlas-ezo-sensor.c | 73 ++++++++++++++++++-------
 drivers/iio/industrialio-core.c         |  1 +
 include/uapi/linux/iio/types.h          |  1 +
 tools/iio/iio_event_monitor.c           |  2 +
 5 files changed, 60 insertions(+), 19 deletions(-)

-- 
2.20.1

[PATCH v3 1/2] iio: add IIO_MOD_O2 modifier

[Matt Ranostay]

Add modifier IIO_MOD_O2 for O2 concentration reporting

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.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 5c62bfb0f3f5..405181fde40a 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1564,6 +1564,8 @@ 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_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
 KernelVersion:	4.3
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 606d5e61c575..59003dc44e60 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -133,6 +133,7 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_PM10] = "pm10",
 	[IIO_MOD_ETHANOL] = "ethanol",
 	[IIO_MOD_H2] = "h2",
+	[IIO_MOD_O2] = "o2",
 };
 
 /* 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 fdd81affca4b..48c13147c0a8 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -94,6 +94,7 @@ enum iio_modifier {
 	IIO_MOD_PM10,
 	IIO_MOD_ETHANOL,
 	IIO_MOD_H2,
+	IIO_MOD_O2,
 };
 
 enum iio_event_type {
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index f115d166c985..bb03859db89d 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -119,6 +119,7 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_PM2P5] = "pm2p5",
 	[IIO_MOD_PM4] = "pm4",
 	[IIO_MOD_PM10] = "pm10",
+	[IIO_MOD_O2] = "o2",
 };
 
 static bool event_is_known(struct iio_event_data *event)
@@ -211,6 +212,7 @@ static bool event_is_known(struct iio_event_data *event)
 	case IIO_MOD_PM2P5:
 	case IIO_MOD_PM4:
 	case IIO_MOD_PM10:
+	case IIO_MOD_O2:
 		break;
 	default:
 		return false;
-- 
2.20.1

[PATCH v3 2/2] iio: chemical: atlas-ezo-sensor: add support for O2 sensor

[Matt Ranostay]

Add support for the Atlas EZO O2 chemical sensor which required
some refactoring of the driver and parsing of i2c transfer.

Sensor data is converted by the scaling value from percent to
IIO_CONCENTRATION.

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/chemical/atlas-ezo-sensor.c | 73 ++++++++++++++++++-------
 1 file changed, 54 insertions(+), 19 deletions(-)

diff --git a/drivers/iio/chemical/atlas-ezo-sensor.c b/drivers/iio/chemical/atlas-ezo-sensor.c
index 8b72bb012363..60a0c752fbc5 100644
--- a/drivers/iio/chemical/atlas-ezo-sensor.c
+++ b/drivers/iio/chemical/atlas-ezo-sensor.c
@@ -16,10 +16,11 @@
 #include <linux/iio/iio.h>
 
 #define ATLAS_EZO_DRV_NAME		"atlas-ezo-sensor"
-#define ATLAS_CO2_INT_TIME_IN_MS	950
+#define ATLAS_INT_TIME_IN_MS		950
 
 enum {
 	ATLAS_CO2_EZO,
+	ATLAS_O2_EZO,
 };
 
 struct atlas_ezo_device {
@@ -38,31 +39,53 @@ struct atlas_ezo_data {
 	u8 buffer[8];
 };
 
+#define ATLAS_CONCENTRATION_CHANNEL(_modifier) \
+	{ \
+		.type = IIO_CONCENTRATION, \
+		.modified = 1,\
+		.channel2 = _modifier, \
+		.info_mask_separate = \
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
+		.scan_index = 0, \
+		.scan_type =  { \
+			.sign = 'u', \
+			.realbits = 32, \
+			.storagebits = 32, \
+			.endianness = IIO_CPU, \
+		}, \
+	}
+
 static const struct iio_chan_spec atlas_co2_ezo_channels[] = {
-	{
-		.type = IIO_CONCENTRATION,
-		.modified = 1,
-		.channel2 = IIO_MOD_CO2,
-		.info_mask_separate =
-			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
-		.scan_index = 0,
-		.scan_type = {
-			.sign = 'u',
-			.realbits = 32,
-			.storagebits = 32,
-			.endianness = IIO_CPU,
-		},
-	},
+	ATLAS_CONCENTRATION_CHANNEL(IIO_MOD_CO2),
+};
+
+static const struct iio_chan_spec atlas_o2_ezo_channels[] = {
+	ATLAS_CONCENTRATION_CHANNEL(IIO_MOD_O2),
 };
 
 static struct atlas_ezo_device atlas_ezo_devices[] = {
 	[ATLAS_CO2_EZO] = {
 		.channels = atlas_co2_ezo_channels,
 		.num_channels = 1,
-		.delay = ATLAS_CO2_INT_TIME_IN_MS,
+		.delay = ATLAS_INT_TIME_IN_MS,
 	},
+	[ATLAS_O2_EZO] = {
+		.channels = atlas_o2_ezo_channels,
+		.num_channels = 1,
+		.delay = ATLAS_INT_TIME_IN_MS,
+	}
 };
 
+static void atlas_ezo_sanitize(char *buf)
+{
+	char *ptr = strchr(buf, '.');
+
+	if (!ptr)
+		return;
+
+	memmove(ptr, ptr + 1, strlen(ptr));
+}
+
 static int atlas_ezo_read_raw(struct iio_dev *indio_dev,
 			  struct iio_chan_spec const *chan,
 			  int *val, int *val2, long mask)
@@ -96,6 +119,9 @@ static int atlas_ezo_read_raw(struct iio_dev *indio_dev,
 			return -EBUSY;
 		}
 
+		/* removing floating point for fixed number representation */
+		atlas_ezo_sanitize(data->buffer + 2);
+
 		ret = kstrtol(data->buffer + 1, 10, &tmp);
 
 		*val = tmp;
@@ -105,9 +131,16 @@ static int atlas_ezo_read_raw(struct iio_dev *indio_dev,
 		return ret ? ret : IIO_VAL_INT;
 	}
 	case IIO_CHAN_INFO_SCALE:
-		*val = 0;
-		*val2 = 100; /* 0.0001 */
-		return IIO_VAL_INT_PLUS_MICRO;
+		switch (chan->channel2) {
+		case IIO_MOD_CO2:
+			*val = 0;
+			*val2 = 100; /* 0.0001 */
+			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_MOD_O2:
+			*val = 100;
+			return IIO_VAL_INT;
+		}
+		return -EINVAL;
 	}
 
 	return 0;
@@ -119,12 +152,14 @@ static const struct iio_info atlas_info = {
 
 static const struct i2c_device_id atlas_ezo_id[] = {
 	{ "atlas-co2-ezo", ATLAS_CO2_EZO },
+	{ "atlas-o2-ezo", ATLAS_O2_EZO },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, atlas_ezo_id);
 
 static const struct of_device_id atlas_ezo_dt_ids[] = {
 	{ .compatible = "atlas,co2-ezo", .data = (void *)ATLAS_CO2_EZO, },
+	{ .compatible = "atlas,o2-ezo", .data = (void *)ATLAS_O2_EZO, },
 	{}
 };
 MODULE_DEVICE_TABLE(of, atlas_ezo_dt_ids);
-- 
2.20.1

Re: [PATCH v3 0/2] iio: chemical: atlas-ezo-sensor: add support for O2 sensor

[Jonathan Cameron]

On Thu, 23 Jul 2020 09:29:42 +0300
Matt Ranostay <matt.ranostay@konsulko.com> wrote:

> Changes from v1:
> * rebased on modifier changes for IIO_MOD_H2/ETHANOL string identifiers
> 
> Changes from v2:
> * change in atlas_ezo_sanitize() to use memmove()
> 
> Matt Ranostay (2):
>   iio: add IIO_MOD_O2 modifier
>   iio: chemical: atlas-ezo-sensor: add support for O2 sensor
> 
>  Documentation/ABI/testing/sysfs-bus-iio |  2 +
>  drivers/iio/chemical/atlas-ezo-sensor.c | 73 ++++++++++++++++++-------
>  drivers/iio/industrialio-core.c         |  1 +
>  include/uapi/linux/iio/types.h          |  1 +
>  tools/iio/iio_event_monitor.c           |  2 +
>  5 files changed, 60 insertions(+), 19 deletions(-)
> 

Applied to the togreg branch of iio.git and pushed out as testing.
Unfortunately we are probably looking at next cycle now.

Thanks,

Jonathan