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Commit b8189beb authored by Thomas Haemmerle's avatar Thomas Haemmerle Committed by Jonathan Cameron
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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: default avatarThomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Link: https://lore.kernel.org/r/20240415105030.1161770-3-thomas.haemmerle@leica-geosystems.comSigned-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 9dd6b32e
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Showing with 72 additions and 57 deletions
drivers/iio/pressure/dps310.c
View file @ b8189beb
......@@ -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, &reg_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, &reg_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, &reg_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, &reg_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, &reg_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, &reg_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)
goto done;
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)
goto done;
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:
......
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