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// 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");
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