iio: pressure: Fixes SPI support for BMP3xx devices

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: a9dd9ba ("iio: pressure: Fixes BMP38x and BMP390 SPI support")
Signed-off-by: Vasileios Amoiridis <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

Author: vamoirid

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,

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,

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;