linux-kernel - [PATCH 5.0 056/115] iio:chemical:bme680: Fix, report temperature in millidegrees

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Date:   Wed, 24 Apr 2019 19:09:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mike Looijmans <mike.looijmans@...ic.nl>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.0 056/115] iio:chemical:bme680: Fix, report temperature in millidegrees

From: Mike Looijmans <mike.looijmans@...ic.nl>

commit 9436f45dd53595e21566a8c6627411077dfdb776 upstream.

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@...ic.nl>
Fixes: 1b3bd8592780 ("iio: chemical: Add support for Bosch BME680 sensor");
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/chemical/bme680_core.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -583,8 +583,7 @@ static int bme680_gas_config(struct bme6
 	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 bme68
 	 * 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 bme6
 	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 bme6
 	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_de
 	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: