[PATCH 6.8 275/336] iio: pressure: Fixes SPI support for BMP3xx devices

Greg Kroah-Hartman
2024-05-14T10:49:53Z

From: Vasileios Amoiridis <vassilisamir@gmail.com>

commit 5ca29ea4e4073b3caba750efe155b1bd4c597ca9 upstream.

Bosch does not use unique BMPxxx_CHIP_ID for the different versions
of the device which leads to misidentification of devices if their
ID is used. Use a new value in the chip_info structure instead of
the BMPxxx_CHIP_ID, in order to choose the correct regmap_bus to
be used.

Fixes: a9dd9ba32311 ("iio: pressure: Fixes BMP38x and BMP390 SPI support")
Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
Link: https://lore.kernel.org/r/20240316110743.1998400-3-vassilisamir@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iio/pressure/bmp280-core.c | 1 +
drivers/iio/pressure/bmp280-spi.c | 9 ++-------
drivers/iio/pressure/bmp280.h | 1 +
3 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index fe8734468ed3..62e9e93d915d 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -1233,6 +1233,7 @@ const struct bmp280_chip_info bmp380_chip_info = {
.chip_id = bmp380_chip_ids,
.num_chip_id = ARRAY_SIZE(bmp380_chip_ids),
.regmap_config = &bmp380_regmap_config,
+ .spi_read_extra_byte = true,
.start_up_time = 2000,
.channels = bmp380_channels,
.num_channels = 2,
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
index 038d36aad3eb..4e19ea0b4d39 100644
--- a/drivers/iio/pressure/bmp280-spi.c
+++ b/drivers/iio/pressure/bmp280-spi.c
@@ -96,15 +96,10 @@ static int bmp280_spi_probe(struct spi_device *spi)

chip_info = spi_get_device_match_data(spi);

- switch (chip_info->chip_id[0]) {
- case BMP380_CHIP_ID:
- case BMP390_CHIP_ID:
+ if (chip_info->spi_read_extra_byte)
bmp_regmap_bus = &bmp380_regmap_bus;
- break;
- default:
+ else
bmp_regmap_bus = &bmp280_regmap_bus;
- break;
- }

regmap = devm_regmap_init(&spi->dev,
bmp_regmap_bus,
diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h
index 4012387d7956..5812a344ed8e 100644
--- a/drivers/iio/pressure/bmp280.h
+++ b/drivers/iio/pressure/bmp280.h
@@ -423,6 +423,7 @@ struct bmp280_chip_info {
int num_chip_id;

const struct regmap_config *regmap_config;
+ bool spi_read_extra_byte;

const struct iio_chan_spec *channels;
int num_channels;
--
2.45.0