linux-kernel - [PATCH v2 4/4] iio: pressure: dps310: simplify scale factor reading

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Date: Wed, 10 Apr 2024 12:36:04 +0200
From: Thomas Haemmerle <thomas.haemmerle@...ca-geosystems.com>
To: joel@....id.au
Cc: bsp-development.geo@...ca-geosystems.com,
	Thomas Haemmerle <thomas.haemmerle@...ca-geosystems.com>,
	Eddie James <eajames@...ux.ibm.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] iio: pressure: dps310: simplify scale factor reading

Both functions `dps310_get_pres_precision` and
`dps310_get_temp_precision` provide the oversampling rate by calling the
`BIT()` macro. However, to look up the corresponding scale factor, we
need the register value itself. Currently, this is achieved by undoing
the calculation of the oversampling rate with `ilog2()`.

Simplify the two functions for getting the scale factor and directly
use the register content for the lookup.

Signed-off-by: Thomas Haemmerle <thomas.haemmerle@...ca-geosystems.com>
---
 drivers/iio/pressure/dps310.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
index 4abce7e40715..320e34ff9381 100644
--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -382,11 +382,11 @@ static int dps310_get_pres_k(struct dps310_data *data, int *val)
 {
 	int reg_val, rc;
 
-	rc = dps310_get_pres_precision(data, &reg_val);
-	if (rc)
+	rc = regmap_read(data->regmap, DPS310_PRS_CFG, &reg_val);
+	if (rc < 0)
 		return rc;
 
-	*val = scale_factors[ilog2(reg_val)];
+	*val = scale_factors[reg_val & GENMASK(2, 0)];
 
 	return 0;
 }
@@ -395,11 +395,11 @@ static int dps310_get_temp_k(struct dps310_data *data, int *val)
 {
 	int reg_val, rc;
 
-	rc = dps310_get_temp_precision(data, &reg_val);
-	if (rc)
+	rc = regmap_read(data->regmap, DPS310_TMP_CFG, &reg_val);
+	if (rc < 0)
 		return rc;
 
-	*val = scale_factors[ilog2(reg_val)];
+	*val = scale_factors[reg_val & GENMASK(2, 0)];
 
 	return 0;
 }
-- 
2.34.1