[PATCH v3 4/6] iio: imu: bmi270: Add support for BMI260

Justin Weiss
2024-10-20T22:01:27Z

Adds support for the Bosch BMI260 6-axis IMU to the Bosch BMI270
driver. Setup and operation is nearly identical to the Bosch BMI270,
but has a different chip ID and requires different firmware.

Firmware is requested and loaded from userspace.

Signed-off-by: Justin Weiss <justin@justinweiss.com>
---
drivers/iio/imu/bmi270/bmi270.h | 1 +
drivers/iio/imu/bmi270/bmi270_core.c | 28 +++++++++++++++++++++++++++-
drivers/iio/imu/bmi270/bmi270_i2c.c | 13 +++++++++++++
drivers/iio/imu/bmi270/bmi270_spi.c | 8 ++++++++
4 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/imu/bmi270/bmi270.h b/drivers/iio/imu/bmi270/bmi270.h
index 93e5f387607b..d8f6d7cf47fc 100644
--- a/drivers/iio/imu/bmi270/bmi270.h
+++ b/drivers/iio/imu/bmi270/bmi270.h
@@ -20,6 +20,7 @@ struct bmi270_chip_info {
};

extern const struct regmap_config bmi270_regmap_config;
+extern const struct bmi270_chip_info bmi260_chip_info;
extern const struct bmi270_chip_info bmi270_chip_info;

int bmi270_core_probe(struct device *dev, struct regmap *regmap,
diff --git a/drivers/iio/imu/bmi270/bmi270_core.c b/drivers/iio/imu/bmi270/bmi270_core.c
index 5f08d786fa21..24e45d6f0706 100644
--- a/drivers/iio/imu/bmi270/bmi270_core.c
+++ b/drivers/iio/imu/bmi270/bmi270_core.c
@@ -11,6 +11,11 @@
#include "bmi270.h"

#define BMI270_CHIP_ID_REG 0x00
+
+/* Used to prevent sending incompatible firmware to BMI160 devices */
+#define BMI160_CHIP_ID_VAL 0xD1
+
+#define BMI260_CHIP_ID_VAL 0x27
#define BMI270_CHIP_ID_VAL 0x24
#define BMI270_CHIP_ID_MSK GENMASK(7, 0)

@@ -55,6 +60,7 @@
#define BMI270_PWR_CTRL_ACCEL_EN_MSK BIT(2)
#define BMI270_PWR_CTRL_TEMP_EN_MSK BIT(3)

+#define BMI260_INIT_DATA_FILE "bmi260-init-data.fw"
#define BMI270_INIT_DATA_FILE "bmi270-init-data.fw"

enum bmi270_scan {
@@ -66,6 +72,13 @@ enum bmi270_scan {
BMI270_SCAN_GYRO_Z,
};

+const struct bmi270_chip_info bmi260_chip_info = {
+ .name = "bmi260",
+ .chip_id = BMI260_CHIP_ID_VAL,
+ .fw_name = BMI260_INIT_DATA_FILE,
+};
+EXPORT_SYMBOL_NS_GPL(bmi260_chip_info, IIO_BMI270);
+
const struct bmi270_chip_info bmi270_chip_info = {
.name = "bmi270",
.chip_id = BMI270_CHIP_ID_VAL,
@@ -157,8 +170,21 @@ static int bmi270_validate_chip_id(struct bmi270_data *bmi270_device)
if (ret)
return dev_err_probe(dev, ret, "Failed to read chip id");

+ /*
+ * Some manufacturers use "BMI0160" for both the BMI160 and
+ * BMI260. If the device is actually a BMI160, the bmi160
+ * driver should handle it and this driver should not.
+ */
+ if (chip_id == BMI160_CHIP_ID_VAL)
+ return -ENODEV;
+
if (chip_id != bmi270_device->chip_info->chip_id)
- dev_info(dev, "Unknown chip id 0x%x", chip_id);
+ dev_info(dev, "Unexpected chip id 0x%x", chip_id);
+
+ if (chip_id == bmi260_chip_info.chip_id)
+ bmi270_device->chip_info = &bmi260_chip_info;
+ else if (chip_id == bmi270_chip_info.chip_id)
+ bmi270_device->chip_info = &bmi270_chip_info;

return 0;
}
diff --git a/drivers/iio/imu/bmi270/bmi270_i2c.c b/drivers/iio/imu/bmi270/bmi270_i2c.c
index 394f27996059..3d0d8f3e8b63 100644
--- a/drivers/iio/imu/bmi270/bmi270_i2c.c
+++ b/drivers/iio/imu/bmi270/bmi270_i2c.c
@@ -32,11 +32,23 @@ static int bmi270_i2c_probe(struct i2c_client *client)
}

static const struct i2c_device_id bmi270_i2c_id[] = {
+ { "bmi260", (kernel_ulong_t)&bmi260_chip_info },
{ "bmi270", (kernel_ulong_t)&bmi270_chip_info },
{ }
};

+static const struct acpi_device_id bmi270_acpi_match[] = {
+ /* OrangePi NEO */
+ { "BMI0260", (kernel_ulong_t)&bmi260_chip_info },
+ /* GPD Win Mini, Aya Neo AIR Pro, OXP Mini Pro, etc. */
+ { "BMI0160", (kernel_ulong_t)&bmi260_chip_info },
+ /* GPD Win Max 2 */
+ { "10EC5280", (kernel_ulong_t)&bmi260_chip_info },
+ { }
+};
+
static const struct of_device_id bmi270_of_match[] = {
+ { .compatible = "bosch,bmi260", .data = &bmi260_chip_info },
{ .compatible = "bosch,bmi270", .data = &bmi270_chip_info },
{ }
};
@@ -44,6 +56,7 @@ static const struct of_device_id bmi270_of_match[] = {
static struct i2c_driver bmi270_i2c_driver = {
.driver = {
.name = "bmi270_i2c",
+ .acpi_match_table = bmi270_acpi_match,
.of_match_table = bmi270_of_match,
},
.probe = bmi270_i2c_probe,
diff --git a/drivers/iio/imu/bmi270/bmi270_spi.c b/drivers/iio/imu/bmi270/bmi270_spi.c
index 7c2062c660d9..7f42ed74023b 100644
--- a/drivers/iio/imu/bmi270/bmi270_spi.c
+++ b/drivers/iio/imu/bmi270/bmi270_spi.c
@@ -65,11 +65,18 @@ static int bmi270_spi_probe(struct spi_device *spi)
}

static const struct spi_device_id bmi270_spi_id[] = {
+ { "bmi260", (kernel_ulong_t)&bmi260_chip_info},
{ "bmi270", (kernel_ulong_t)&bmi270_chip_info },
{ }
};

+static const struct acpi_device_id bmi270_acpi_match[] = {
+ { "BOSC0260", (kernel_ulong_t)&bmi260_chip_info },
+ { }
+};
+
static const struct of_device_id bmi270_of_match[] = {
+ { .compatible = "bosch,bmi260", .data = &bmi260_chip_info },
{ .compatible = "bosch,bmi270", .data = &bmi270_chip_info },
{ }
};
@@ -77,6 +84,7 @@ static const struct of_device_id bmi270_of_match[] = {
static struct spi_driver bmi270_spi_driver = {
.driver = {
.name = "bmi270",
+ .acpi_match_table = bmi270_acpi_match,
.of_match_table = bmi270_of_match,
},
.probe = bmi270_spi_probe,
--
2.47.0