1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/iio/imu/bmi270/bmi270_spi.c b/drivers/iio/imu/bmi270/bmi270_spi.c
new file mode 100644
index 000000000000..88a77aba5e4f
--- /dev/null
+++ b/drivers/iio/imu/bmi270/bmi270_spi.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+#include <linux/iio/iio.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "bmi270.h"
+
+/*
+ * The following two functions are taken from the BMI323 spi driver code.
+ * In section 6.4 of the BMI270 data it specifies that after a read
+ * operation the first data byte from the device is a dummy byte
+ */
+static int bmi270_regmap_spi_read(void *spi, const void *reg_buf,
+				  size_t reg_size, void *val_buf,
+				  size_t val_size)
+{
+	return spi_write_then_read(spi, reg_buf, reg_size, val_buf, val_size);
+}
+
+static int bmi270_regmap_spi_write(void *spi, const void *data,
+				   size_t count)
+{
+	u8 *data_buff = (u8 *)data;
+
+	/*
+	 * Remove the extra pad byte since its only needed for the read
+	 * operation
+	 */
+	data_buff[1] = data_buff[0];
+	return spi_write_then_read(spi, data_buff + 1, count - 1, NULL, 0);
+}
+
+static const struct regmap_bus bmi270_regmap_bus = {
+	.read = bmi270_regmap_spi_read,
+	.write = bmi270_regmap_spi_write,
+};
+
+static const struct regmap_config bmi270_spi_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.pad_bits = 8,
+	.read_flag_mask = BIT(7),
+};
+
+static int bmi270_spi_probe(struct spi_device *spi)
+{
+	struct regmap *regmap;
+	struct device *dev = &spi->dev;
+	const struct bmi270_chip_info *chip_info;
+
+	chip_info = spi_get_device_match_data(spi);
+	if (!chip_info)
+		return -ENODEV;
+
+	regmap = devm_regmap_init(dev, &bmi270_regmap_bus, dev,
+				  &bmi270_spi_regmap_config);
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "Failed to init i2c regmap");
+
+	return bmi270_core_probe(dev, regmap, chip_info);
+}
+
+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 of_device_id bmi270_of_match[] = {
+	{ .compatible = "bosch,bmi260", .data = &bmi260_chip_info },
+	{ .compatible = "bosch,bmi270", .data = &bmi270_chip_info },
+	{ }
+};
+
+static struct spi_driver bmi270_spi_driver = {
+	.driver = {
+		.name = "bmi270",
+		.of_match_table = bmi270_of_match,
+	},
+	.probe = bmi270_spi_probe,
+	.id_table = bmi270_spi_id,
+};
+module_spi_driver(bmi270_spi_driver);
+
+MODULE_AUTHOR("Alex Lanzano");
+MODULE_DESCRIPTION("BMI270 driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_BMI270");