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// SPDX-License-Identifier: GPL-2.0
/*
* SPI driver for Bosch BMI323 6-Axis IMU.
*
* Copyright (C) 2023, Jagath Jog J <jagathjog1996@gmail.com>
*/
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include "bmi323.h"
/*
* From BMI323 datasheet section 4: Notes on the Serial Interface Support.
* Each SPI register read operation requires to read one dummy byte before
* the actual payload.
*/
static int bmi323_regmap_spi_read(void *context, const void *reg_buf,
size_t reg_size, void *val_buf,
size_t val_size)
{
struct spi_device *spi = context;
return spi_write_then_read(spi, reg_buf, reg_size, val_buf, val_size);
}
static int bmi323_regmap_spi_write(void *context, const void *data,
size_t count)
{
struct spi_device *spi = context;
u8 *data_buff = (u8 *)data;
data_buff[1] = data_buff[0];
return spi_write(spi, data_buff + 1, count - 1);
}
static const struct regmap_bus bmi323_regmap_bus = {
.read = bmi323_regmap_spi_read,
.write = bmi323_regmap_spi_write,
};
static const struct regmap_config bmi323_spi_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.pad_bits = 8,
.read_flag_mask = BIT(7),
.max_register = BMI323_CFG_RES_REG,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static int bmi323_spi_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct regmap *regmap;
regmap = devm_regmap_init(dev, &bmi323_regmap_bus, dev,
&bmi323_spi_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to initialize SPI Regmap\n");
return bmi323_core_probe(dev);
}
static const struct spi_device_id bmi323_spi_ids[] = {
{ "bmi323" },
{ }
};
MODULE_DEVICE_TABLE(spi, bmi323_spi_ids);
static const struct of_device_id bmi323_of_spi_match[] = {
{ .compatible = "bosch,bmi323" },
{ }
};
MODULE_DEVICE_TABLE(of, bmi323_of_spi_match);
static struct spi_driver bmi323_spi_driver = {
.driver = {
.name = "bmi323",
.pm = pm_ptr(&bmi323_core_pm_ops),
.of_match_table = bmi323_of_spi_match,
},
.probe = bmi323_spi_probe,
.id_table = bmi323_spi_ids,
};
module_spi_driver(bmi323_spi_driver);
MODULE_DESCRIPTION("Bosch BMI323 IMU driver");
MODULE_AUTHOR("Jagath Jog J <jagathjog1996@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_BMI323);
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