[PATCH 4.19 040/105] iio: pressure: ms5611: fixed value compensation bug

Greg Kroah-Hartman
2022-12-05T19:19:30Z

From: Mitja Spes <mitja@lxnav.com>

[ Upstream commit 17f442e7e47579d3881fc4d47354eaef09302e6f ]

When using multiple instances of this driver the compensation PROM was
overwritten by the last initialized sensor. Now each sensor has own PROM
storage.

Signed-off-by: Mitja Spes <mitja@lxnav.com>
Fixes: 9690d81a02dc ("iio: pressure: ms5611: add support for MS5607 temperature and pressure sensor")
Link: https://lore.kernel.org/r/20221021135827.1444793-2-mitja@lxnav.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/pressure/ms5611.h | 12 +++----
drivers/iio/pressure/ms5611_core.c | 51 ++++++++++++++++--------------
2 files changed, 31 insertions(+), 32 deletions(-)

diff --git a/drivers/iio/pressure/ms5611.h b/drivers/iio/pressure/ms5611.h
index 236da38fb4b3..afcd622841dd 100644
--- a/drivers/iio/pressure/ms5611.h
+++ b/drivers/iio/pressure/ms5611.h
@@ -28,13 +28,6 @@ enum {
MS5607,
};

-struct ms5611_chip_info {
- u16 prom[MS5611_PROM_WORDS_NB];
-
- int (*temp_and_pressure_compensate)(struct ms5611_chip_info *chip_info,
- s32 *temp, s32 *pressure);
-};
-
/*
* OverSampling Rate descriptor.
* Warning: cmd MUST be kept aligned on a word boundary (see
@@ -53,12 +46,15 @@ struct ms5611_state {
const struct ms5611_osr *pressure_osr;
const struct ms5611_osr *temp_osr;

+ u16 prom[MS5611_PROM_WORDS_NB];
+
int (*reset)(struct ms5611_state *st);
int (*read_prom_word)(struct ms5611_state *st, int index, u16 *word);
int (*read_adc_temp_and_pressure)(struct ms5611_state *st,
s32 *temp, s32 *pressure);

- struct ms5611_chip_info *chip_info;
+ int (*compensate_temp_and_pressure)(struct ms5611_state *st, s32 *temp,
+ s32 *pressure);
struct regulator *vdd;
};

diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c
index 6cbc58c601bb..5c7a734ede54 100644
--- a/drivers/iio/pressure/ms5611_core.c
+++ b/drivers/iio/pressure/ms5611_core.c
@@ -88,7 +88,7 @@ static int ms5611_read_prom(struct iio_dev *indio_dev)
struct ms5611_state *st = iio_priv(indio_dev);

for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
- ret = st->read_prom_word(st, i, &st->chip_info->prom[i]);
+ ret = st->read_prom_word(st, i, &st->prom[i]);
if (ret < 0) {
dev_err(&indio_dev->dev,
"failed to read prom at %d\n", i);
@@ -96,7 +96,7 @@ static int ms5611_read_prom(struct iio_dev *indio_dev)
}
}

- if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) {
+ if (!ms5611_prom_is_valid(st->prom, MS5611_PROM_WORDS_NB)) {
dev_err(&indio_dev->dev, "PROM integrity check failed\n");
return -ENODEV;
}
@@ -117,21 +117,20 @@ static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
return ret;
}

- return st->chip_info->temp_and_pressure_compensate(st->chip_info,
- temp, pressure);
+ return st->compensate_temp_and_pressure(st, temp, pressure);
}

-static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
+static int ms5611_temp_and_pressure_compensate(struct ms5611_state *st,
s32 *temp, s32 *pressure)
{
s32 t = *temp, p = *pressure;
s64 off, sens, dt;

- dt = t - (chip_info->prom[5] << 8);
- off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7);
- sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8);
+ dt = t - (st->prom[5] << 8);
+ off = ((s64)st->prom[2] << 16) + ((st->prom[4] * dt) >> 7);
+ sens = ((s64)st->prom[1] << 15) + ((st->prom[3] * dt) >> 8);

- t = 2000 + ((chip_info->prom[6] * dt) >> 23);
+ t = 2000 + ((st->prom[6] * dt) >> 23);
if (t < 2000) {
s64 off2, sens2, t2;

@@ -157,17 +156,17 @@ static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_inf
return 0;
}

-static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
+static int ms5607_temp_and_pressure_compensate(struct ms5611_state *st,
s32 *temp, s32 *pressure)
{
s32 t = *temp, p = *pressure;
s64 off, sens, dt;

- dt = t - (chip_info->prom[5] << 8);
- off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6);
- sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7);
+ dt = t - (st->prom[5] << 8);
+ off = ((s64)st->prom[2] << 17) + ((st->prom[4] * dt) >> 6);
+ sens = ((s64)st->prom[1] << 16) + ((st->prom[3] * dt) >> 7);

- t = 2000 + ((chip_info->prom[6] * dt) >> 23);
+ t = 2000 + ((st->prom[6] * dt) >> 23);
if (t < 2000) {
s64 off2, sens2, t2, tmp;

@@ -345,15 +344,6 @@ static int ms5611_write_raw(struct iio_dev *indio_dev,

static const unsigned long ms5611_scan_masks[] = {0x3, 0};

-static struct ms5611_chip_info chip_info_tbl[] = {
- [MS5611] = {
- .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate,
- },
- [MS5607] = {
- .temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate,
- }
-};
-
static const struct iio_chan_spec ms5611_channels[] = {
{
.type = IIO_PRESSURE,
@@ -436,7 +426,20 @@ int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
struct ms5611_state *st = iio_priv(indio_dev);

mutex_init(&st->lock);
- st->chip_info = &chip_info_tbl[type];
+
+ switch (type) {
+ case MS5611:
+ st->compensate_temp_and_pressure =
+ ms5611_temp_and_pressure_compensate;
+ break;
+ case MS5607:
+ st->compensate_temp_and_pressure =
+ ms5607_temp_and_pressure_compensate;
+ break;
+ default:
+ return -EINVAL;
+ }
+
st->temp_osr =
&ms5611_avail_temp_osr[ARRAY_SIZE(ms5611_avail_temp_osr) - 1];
st->pressure_osr =
--
2.35.1