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Message-Id: <20240410103604.992989-3-thomas.haemmerle@leica-geosystems.com>
Date: Wed, 10 Apr 2024 12:36:02 +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 2/4] iio: pressure: dps310: introduce consistent error handling
Align error handling with `dps310_calculate_temp`, where it's not
possible to differentiate between errors and valid calculations by
checking if the returned value is negative.
Signed-off-by: Thomas Haemmerle <thomas.haemmerle@...ca-geosystems.com>
---
drivers/iio/pressure/dps310.c | 129 +++++++++++++++++++---------------
1 file changed, 72 insertions(+), 57 deletions(-)
diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
index d0a516d56da4..a48e8adf63ae 100644
--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -256,24 +256,24 @@ static int dps310_startup(struct dps310_data *data)
return dps310_temp_workaround(data);
}
-static int dps310_get_pres_precision(struct dps310_data *data)
+static int dps310_get_pres_precision(struct dps310_data *data, int *val)
{
- int rc;
- int val;
+ int reg_val, rc;
- rc = regmap_read(data->regmap, DPS310_PRS_CFG, &val);
+ rc = regmap_read(data->regmap, DPS310_PRS_CFG, ®_val);
if (rc < 0)
return rc;
- return BIT(val & GENMASK(2, 0));
+ *val = BIT(reg_val & GENMASK(2, 0));
+
+ return 0;
}
-static int dps310_get_temp_precision(struct dps310_data *data)
+static int dps310_get_temp_precision(struct dps310_data *data, int *val)
{
- int rc;
- int val;
+ int reg_val, rc;
- rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val);
+ rc = regmap_read(data->regmap, DPS310_TMP_CFG, ®_val);
if (rc < 0)
return rc;
@@ -281,7 +281,9 @@ static int dps310_get_temp_precision(struct dps310_data *data)
* Scale factor is bottom 4 bits of the register, but 1111 is
* reserved so just grab bottom three
*/
- return BIT(val & GENMASK(2, 0));
+ *val = BIT(reg_val & GENMASK(2, 0));
+
+ return 0;
}
/* Called with lock held */
@@ -350,48 +352,56 @@ static int dps310_set_temp_samp_freq(struct dps310_data *data, int freq)
DPS310_TMP_RATE_BITS, val);
}
-static int dps310_get_pres_samp_freq(struct dps310_data *data)
+static int dps310_get_pres_samp_freq(struct dps310_data *data, int *val)
{
- int rc;
- int val;
+ int reg_val, rc;
- rc = regmap_read(data->regmap, DPS310_PRS_CFG, &val);
+ rc = regmap_read(data->regmap, DPS310_PRS_CFG, ®_val);
if (rc < 0)
return rc;
- return BIT((val & DPS310_PRS_RATE_BITS) >> 4);
+ *val = BIT((reg_val & DPS310_PRS_RATE_BITS) >> 4);
+
+ return 0;
}
-static int dps310_get_temp_samp_freq(struct dps310_data *data)
+static int dps310_get_temp_samp_freq(struct dps310_data *data, int *val)
{
- int rc;
- int val;
+ int reg_val, rc;
- rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val);
+ rc = regmap_read(data->regmap, DPS310_TMP_CFG, ®_val);
if (rc < 0)
return rc;
- return BIT((val & DPS310_TMP_RATE_BITS) >> 4);
+ *val = BIT((reg_val & DPS310_TMP_RATE_BITS) >> 4);
+
+ return 0;
}
-static int dps310_get_pres_k(struct dps310_data *data)
+static int dps310_get_pres_k(struct dps310_data *data, int *val)
{
- int rc = dps310_get_pres_precision(data);
+ int reg_val, rc;
- if (rc < 0)
+ rc = dps310_get_pres_precision(data, ®_val);
+ if (rc)
return rc;
- return scale_factors[ilog2(rc)];
+ *val = scale_factors[ilog2(reg_val)];
+
+ return 0;
}
-static int dps310_get_temp_k(struct dps310_data *data)
+static int dps310_get_temp_k(struct dps310_data *data, int *val)
{
- int rc = dps310_get_temp_precision(data);
+ int reg_val, rc;
- if (rc < 0)
+ rc = dps310_get_temp_precision(data, ®_val);
+ if (rc)
return rc;
- return scale_factors[ilog2(rc)];
+ *val = scale_factors[ilog2(reg_val)];
+
+ return 0;
}
static int dps310_reset_wait(struct dps310_data *data)
@@ -464,7 +474,10 @@ static int dps310_read_pres_raw(struct dps310_data *data)
if (mutex_lock_interruptible(&data->lock))
return -EINTR;
- rate = dps310_get_pres_samp_freq(data);
+ rc = dps310_get_pres_samp_freq(data, &rate);
+ if (rc)
+ return rc;
+
timeout = DPS310_POLL_TIMEOUT_US(rate);
/* Poll for sensor readiness; base the timeout upon the sample rate. */
@@ -510,7 +523,10 @@ static int dps310_read_temp_raw(struct dps310_data *data)
if (mutex_lock_interruptible(&data->lock))
return -EINTR;
- rate = dps310_get_temp_samp_freq(data);
+ rc = dps310_get_temp_samp_freq(data, &rate);
+ if (rc)
+ return rc;
+
timeout = DPS310_POLL_TIMEOUT_US(rate);
/* Poll for sensor readiness; base the timeout upon the sample rate. */
@@ -612,13 +628,13 @@ static int dps310_write_raw(struct iio_dev *iio,
return rc;
}
-static int dps310_calculate_pressure(struct dps310_data *data)
+static int dps310_calculate_pressure(struct dps310_data *data, int *val)
{
int i;
int rc;
int t_ready;
- int kpi = dps310_get_pres_k(data);
- int kti = dps310_get_temp_k(data);
+ int kpi;
+ int kti;
s64 rem = 0ULL;
s64 pressure = 0ULL;
s64 p;
@@ -629,11 +645,13 @@ static int dps310_calculate_pressure(struct dps310_data *data)
s64 kp;
s64 kt;
- if (kpi < 0)
- return kpi;
+ rc = dps310_get_pres_k(data, &kpi);
+ if (rc)
+ return rc;
- if (kti < 0)
- return kti;
+ rc = dps310_get_temp_k(data, &kti);
+ if (rc)
+ return rc;
kp = (s64)kpi;
kt = (s64)kti;
@@ -687,7 +705,9 @@ static int dps310_calculate_pressure(struct dps310_data *data)
if (pressure < 0LL)
return -ERANGE;
- return (int)min_t(s64, pressure, INT_MAX);
+ *val = (int)min_t(s64, pressure, INT_MAX);
+
+ return 0;
}
static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2,
@@ -697,11 +717,10 @@ static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2,
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
- rc = dps310_get_pres_samp_freq(data);
- if (rc < 0)
+ rc = dps310_get_pres_samp_freq(data, val);
+ if (rc)
return rc;
- *val = rc;
return IIO_VAL_INT;
case IIO_CHAN_INFO_PROCESSED:
@@ -709,20 +728,17 @@ static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2,
if (rc)
return rc;
- rc = dps310_calculate_pressure(data);
- if (rc < 0)
+ rc = dps310_calculate_pressure(data, val);
+ if (rc)
return rc;
- *val = rc;
*val2 = 1000; /* Convert Pa to KPa per IIO ABI */
return IIO_VAL_FRACTIONAL;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
- rc = dps310_get_pres_precision(data);
- if (rc < 0)
+ rc = dps310_get_pres_precision(data, val);
+ if (rc)
return rc;
-
- *val = rc;
return IIO_VAL_INT;
default:
@@ -734,10 +750,11 @@ static int dps310_calculate_temp(struct dps310_data *data, int *val)
{
s64 c0;
s64 t;
- int kt = dps310_get_temp_k(data);
+ int kt, rc;
- if (kt < 0)
- return kt;
+ rc = dps310_get_temp_k(data, &kt);
+ if (rc)
+ return rc;
/* Obtain inverse-scaled offset */
c0 = div_s64((s64)kt * (s64)data->c0, 2);
@@ -758,11 +775,10 @@ static int dps310_read_temp(struct dps310_data *data, int *val, int *val2,
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
- rc = dps310_get_temp_samp_freq(data);
- if (rc < 0)
+ rc = dps310_get_temp_samp_freq(data, val);
+ if (rc)
return rc;
- *val = rc;
return IIO_VAL_INT;
case IIO_CHAN_INFO_PROCESSED:
@@ -777,11 +793,10 @@ static int dps310_read_temp(struct dps310_data *data, int *val, int *val2,
return IIO_VAL_INT;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
- rc = dps310_get_temp_precision(data);
- if (rc < 0)
+ rc = dps310_get_temp_precision(data, val);
+ if (rc)
return rc;
- *val = rc;
return IIO_VAL_INT;
default:
--
2.34.1
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