iio:chemical:bme680: Fix, report temperature in millidegrees

The standard unit for temperature is millidegrees Celcius. Adapt the
driver to report in millidegrees instead of degrees.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Fixes: 1b3bd8592780 ("iio: chemical: Add support for Bosch BME680 sensor");
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index 70c1fe4..fefe32b 100644 (file)
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -583,8 +583,7 @@ static int bme680_gas_config(struct bme680_data *data)
        return ret;
 }
 
-static int bme680_read_temp(struct bme680_data *data,
-                           int *val, int *val2)
+static int bme680_read_temp(struct bme680_data *data, int *val)
 {
        struct device *dev = regmap_get_device(data->regmap);
        int ret;
@@ -617,10 +616,9 @@ static int bme680_read_temp(struct bme680_data *data,
         * compensate_press/compensate_humid to get compensated
         * pressure/humidity readings.
         */
-       if (val && val2) {
-               *val = comp_temp;
-               *val2 = 100;
-               return IIO_VAL_FRACTIONAL;
+       if (val) {
+               *val = comp_temp * 10; /* Centidegrees to millidegrees */
+               return IIO_VAL_INT;
        }
 
        return ret;
@@ -635,7 +633,7 @@ static int bme680_read_press(struct bme680_data *data,
        s32 adc_press;
 
        /* Read and compensate temperature to get a reading of t_fine */
-       ret = bme680_read_temp(data, NULL, NULL);
+       ret = bme680_read_temp(data, NULL);
        if (ret < 0)
                return ret;
 
@@ -668,7 +666,7 @@ static int bme680_read_humid(struct bme680_data *data,
        u32 comp_humidity;
 
        /* Read and compensate temperature to get a reading of t_fine */
-       ret = bme680_read_temp(data, NULL, NULL);
+       ret = bme680_read_temp(data, NULL);
        if (ret < 0)
                return ret;
 
@@ -761,7 +759,7 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
        case IIO_CHAN_INFO_PROCESSED:
                switch (chan->type) {
                case IIO_TEMP:
-                       return bme680_read_temp(data, val, val2);
+                       return bme680_read_temp(data, val);
                case IIO_PRESSURE:
                        return bme680_read_press(data, val, val2);
                case IIO_HUMIDITYRELATIVE: