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