[PATCH v1 10/13] iio: chemical: bme680: generalize read_*() functions

[vamoirid <vassilisamir@gmail.com>]

From: Vasileios Amoiridis <vassilisamir@gmail.com>

Remove the IIO specific scaling measurement units from the read functions
and add them inside the ->read_raw() function to keep the read_*() generic.
This way they can be used in other parts of the driver.

Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
---
 drivers/iio/chemical/bme680_core.c | 65 ++++++++++++++++++------------
 1 file changed, 40 insertions(+), 25 deletions(-)

diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index 0979c8f0afcf..4669338ec2e5 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -661,22 +661,20 @@ static int bme680_gas_config(struct bme680_data *data)
 	return ret;
 }
 
-static int bme680_read_temp(struct bme680_data *data, int *val)
+static int bme680_read_temp(struct bme680_data *data, s16 *comp_temp)
 {
 	int ret;
 	u32 adc_temp;
-	s16 comp_temp;
 
 	ret = bme680_read_temp_adc(data, &adc_temp);
 	if (ret)
 		return ret;
 
-	comp_temp = bme680_compensate_temp(data, adc_temp);
-	*val = comp_temp * 10; /* Centidegrees to millidegrees */
-	return IIO_VAL_INT;
+	*comp_temp = bme680_compensate_temp(data, adc_temp);
+	return 0;
 }
 
-static int bme680_read_press(struct bme680_data *data, int *val, int *val2)
+static int bme680_read_press(struct bme680_data *data, u32 *comp_press)
 {
 	int ret;
 	u32 adc_press;
@@ -690,15 +688,14 @@ static int bme680_read_press(struct bme680_data *data, int *val, int *val2)
 	if (ret)
 		return ret;
 
-	*val = bme680_compensate_press(data, adc_press, t_fine);
-	*val2 = 1000;
-	return IIO_VAL_FRACTIONAL;
+	*comp_press = bme680_compensate_press(data, adc_press, t_fine);
+	return 0;
 }
 
-static int bme680_read_humid(struct bme680_data *data, int *val, int *val2)
+static int bme680_read_humid(struct bme680_data *data, u32 *comp_humidity)
 {
 	int ret;
-	u32 adc_humidity, comp_humidity;
+	u32 adc_humidity;
 	s32 t_fine;
 
 	ret = bme680_get_t_fine(data, &t_fine);
@@ -709,14 +706,11 @@ static int bme680_read_humid(struct bme680_data *data, int *val, int *val2)
 	if (ret)
 		return ret;
 
-	comp_humidity = bme680_compensate_humid(data, adc_humidity, t_fine);
-
-	*val = comp_humidity;
-	*val2 = 1000;
-	return IIO_VAL_FRACTIONAL;
+	*comp_humidity = bme680_compensate_humid(data, adc_humidity, t_fine);
+	return 0;
 }
 
-static int bme680_read_gas(struct bme680_data *data, int *val)
+static int bme680_read_gas(struct bme680_data *data, int *comp_gas_res)
 {
 	struct device *dev = regmap_get_device(data->regmap);
 	int ret;
@@ -751,9 +745,8 @@ static int bme680_read_gas(struct bme680_data *data, int *val)
 	}
 
 	gas_range = FIELD_GET(BME680_GAS_RANGE_MASK, gas_regs_val);
-
-	*val = bme680_compensate_gas(data, adc_gas_res, gas_range);
-	return IIO_VAL_INT;
+	*comp_gas_res = bme680_compensate_gas(data, adc_gas_res, gas_range);
+	return 0;
 }
 
 static int __bme680_read_raw(struct iio_dev *indio_dev,
@@ -761,7 +754,7 @@ static int __bme680_read_raw(struct iio_dev *indio_dev,
 			     int *val, int *val2, long mask)
 {
 	struct bme680_data *data = iio_priv(indio_dev);
-	int ret;
+	int chan_val, ret;
 
 	guard(mutex)(&data->lock);
 
@@ -777,13 +770,35 @@ 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);
+			ret = bme680_read_temp(data, (s16 *)&chan_val);
+			if (ret)
+				return ret;
+
+			*val = chan_val * 10;
+			return IIO_VAL_INT;
 		case IIO_PRESSURE:
-			return bme680_read_press(data, val, val2);
+			ret = bme680_read_press(data, &chan_val);
+			if (ret)
+				return ret;
+
+			*val = chan_val;
+			*val2 = 1000;
+			return IIO_VAL_FRACTIONAL;
 		case IIO_HUMIDITYRELATIVE:
-			return bme680_read_humid(data, val, val2);
+			ret = bme680_read_humid(data, &chan_val);
+			if (ret)
+				return ret;
+
+			*val = chan_val;
+			*val2 = 1000;
+			return IIO_VAL_FRACTIONAL;
 		case IIO_RESISTANCE:
-			return bme680_read_gas(data, val);
+			ret = bme680_read_gas(data, &chan_val);
+			if (ret)
+				return ret;
+
+			*val = chan_val;
+			return IIO_VAL_INT;
 		default:
 			return -EINVAL;
 		}
-- 
2.43.0