iio: accel: bmc150: Add support for BMC156

BMC156 is another accelerometer that works just fine with the bmc150-accel
driver. It's very similar to BMC150 (also a accelerometer + magnetometer
combo) but with only one accelerometer interrupt pin. It would make sense
if only INT1 was exposed but someone at Bosch decided to only have an
INT2 pin.

Try to deal with this by making use of the INT2 support introduced
in the previous commit and force using INT2 for BMC156. To detect
that we need to bring up a simplified version of the previous type IDs.

Note that unlike the type IDs removed in commit c06a6aba6835
("iio: accel: bmc150: Drop misleading/duplicate chip identifiers")
here I only add one for the special case of BMC156. Everything else
still happens by reading the CHIP_ID register since the chip type
information often is not accurate in ACPI tables.

Tested-by: Nikita Travkin <nikita@trvn.ru> # BMC156
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20210802155657.102766-5-stephan@gerhold.net
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/iio/accel/bmc150-accel-spi.c b/drivers/iio/accel/bmc150-accel-spi.c
index 54b8c9c8068b..191e312dc91a 100644
--- a/drivers/iio/accel/bmc150-accel-spi.c
+++ b/drivers/iio/accel/bmc150-accel-spi.c
@@ -16,6 +16,8 @@
 static int bmc150_accel_probe(struct spi_device *spi)
 {
 	struct regmap *regmap;
+	const char *name = NULL;
+	enum bmc150_type type = BOSCH_UNKNOWN;
 	const struct spi_device_id *id = spi_get_device_id(spi);
 
 	regmap = devm_regmap_init_spi(spi, &bmc150_regmap_conf);
@@ -24,7 +26,12 @@ static int bmc150_accel_probe(struct spi_device *spi)
 		return PTR_ERR(regmap);
 	}
 
-	return bmc150_accel_core_probe(&spi->dev, regmap, spi->irq, id->name,
+	if (id) {
+		name = id->name;
+		type = id->driver_data;
+	}
+
+	return bmc150_accel_core_probe(&spi->dev, regmap, spi->irq, type, name,
 				       true);
 }
 
@@ -54,6 +61,7 @@ static const struct spi_device_id bmc150_accel_id[] = {
 	{"bma255"},
 	{"bma280"},
 	{"bmc150_accel"},
+	{"bmc156_accel", BOSCH_BMC156},
 	{"bmi055_accel"},
 	{}
 };