iio: chemical: atlas-ezo-sensor: add humidity sensor support

Add support for atlas,hum-ezo / humidity sensor which with scaling
provides respective data in millipercent

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/chemical/atlas-ezo-sensor.c b/drivers/iio/chemical/atlas-ezo-sensor.c
index 60a0c752fbc5f88213c81c219a3e355aa952e201..b1bacfe3c3ce0bd93d51c75dcb69c0c29275dc0d 100644 (file)
--- a/drivers/iio/chemical/atlas-ezo-sensor.c
+++ b/drivers/iio/chemical/atlas-ezo-sensor.c
@@ -17,10 +17,12 @@
 
 #define ATLAS_EZO_DRV_NAME             "atlas-ezo-sensor"
 #define ATLAS_INT_TIME_IN_MS           950
+#define ATLAS_INT_HUM_TIME_IN_MS       350
 
 enum {
        ATLAS_CO2_EZO,
        ATLAS_O2_EZO,
+       ATLAS_HUM_EZO,
 };
 
 struct atlas_ezo_device {
@@ -63,6 +65,21 @@ static const struct iio_chan_spec atlas_o2_ezo_channels[] = {
        ATLAS_CONCENTRATION_CHANNEL(IIO_MOD_O2),
 };
 
+static const struct iio_chan_spec atlas_hum_ezo_channels[] = {
+       {
+               .type = IIO_HUMIDITYRELATIVE,
+               .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 struct atlas_ezo_device atlas_ezo_devices[] = {
        [ATLAS_CO2_EZO] = {
                .channels = atlas_co2_ezo_channels,
@@ -73,7 +90,12 @@ static struct atlas_ezo_device atlas_ezo_devices[] = {
                .channels = atlas_o2_ezo_channels,
                .num_channels = 1,
                .delay = ATLAS_INT_TIME_IN_MS,
-       }
+       },
+       [ATLAS_HUM_EZO] = {
+               .channels = atlas_hum_ezo_channels,
+               .num_channels = 1,
+               .delay = ATLAS_INT_HUM_TIME_IN_MS,
+       },
 };
 
 static void atlas_ezo_sanitize(char *buf)
@@ -131,6 +153,17 @@ static int atlas_ezo_read_raw(struct iio_dev *indio_dev,
                return ret ? ret : IIO_VAL_INT;
        }
        case IIO_CHAN_INFO_SCALE:
+               switch (chan->type) {
+               case IIO_HUMIDITYRELATIVE:
+                       *val = 10;
+                       return IIO_VAL_INT;
+               case IIO_CONCENTRATION:
+                       break;
+               default:
+                       return -EINVAL;
+               }
+
+               /* IIO_CONCENTRATION modifiers */
                switch (chan->channel2) {
                case IIO_MOD_CO2:
                        *val = 0;
@@ -153,6 +186,7 @@ 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 },
+       { "atlas-hum-ezo", ATLAS_HUM_EZO },
        {}
 };
 MODULE_DEVICE_TABLE(i2c, atlas_ezo_id);
@@ -160,6 +194,7 @@ 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, },
+       { .compatible = "atlas,hum-ezo", .data = (void *)ATLAS_HUM_EZO, },
        {}
 };
 MODULE_DEVICE_TABLE(of, atlas_ezo_dt_ids);