Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
iio: imu: bmi270: Add spi driver for bmi270 imu
Implement SPI driver for the Bosch BMI270 6-axis IMU. Provide raw read
write access to acceleration and angle velocity measurements via the SPI
interface on the device.
Signed-off-by: Alex Lanzano <lanzano.alex@gmail.com>
Link: https://patch.msgid.link/20241002033628.681812-1-lanzano.alex@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
authored by
Alex Lanzano
and committed by
Jonathan Cameron
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ccc26bd7
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+12
drivers/iio/imu/bmi270/Kconfig
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drivers/iio/imu/bmi270/Kconfig
···
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This driver can also be built as a module. If so, the module will be
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called bmi270_i2c.
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config BMI270_SPI
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tristate "Bosch BMI270 SPI driver"
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depends on SPI
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select BMI270
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select REGMAP_SPI
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help
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Enable support for the Bosch BMI270 6-Axis IMU connected to SPI
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interface.
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This driver can also be built as a module. If so, the module will be
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called bmi270_spi.
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drivers/iio/imu/bmi270/Makefile
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drivers/iio/imu/bmi270/Makefile
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drivers/iio/imu/bmi270/bmi270.h
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drivers/iio/imu/bmi270/bmi270.h
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drivers/iio/imu/bmi270/bmi270_core.c
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drivers/iio/imu/bmi270/bmi270_core.c
···
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BMI270_SCAN_GYRO_Z,
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};
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const struct regmap_config bmi270_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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EXPORT_SYMBOL_NS_GPL(bmi270_regmap_config, IIO_BMI270);
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static int bmi270_get_data(struct bmi270_data *bmi270_device,
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int chan_type, int axis, int *val)
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{
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-1
drivers/iio/imu/bmi270/bmi270_i2c.c
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-1
drivers/iio/imu/bmi270/bmi270_i2c.c
···
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#include "bmi270.h"
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static const struct regmap_config bmi270_i2c_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int bmi270_i2c_probe(struct i2c_client *client)
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{
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struct regmap *regmap;
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struct device *dev = &client->dev;
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regmap = devm_regmap_init_i2c(client, &bmi270_regmap_config);
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regmap = devm_regmap_init_i2c(client, &bmi270_i2c_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 init i2c regmap");
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drivers/iio/imu/bmi270/bmi270_spi.c
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drivers/iio/imu/bmi270/bmi270_spi.c
···
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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#include <linux/iio/iio.h>
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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 "bmi270.h"
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/*
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* The following two functions are taken from the BMI323 spi driver code.
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* In section 6.4 of the BMI270 data it specifies that after a read
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* operation the first data byte from the device is a dummy byte
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*/
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static int bmi270_regmap_spi_read(void *spi, 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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return spi_write_then_read(spi, reg_buf, reg_size, val_buf, val_size);
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}
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static int bmi270_regmap_spi_write(void *spi, const void *data,
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size_t count)
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{
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u8 *data_buff = (u8 *)data;
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/*
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* Remove the extra pad byte since its only needed for the read
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* operation
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*/
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data_buff[1] = data_buff[0];
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return spi_write_then_read(spi, data_buff + 1, count - 1, NULL, 0);
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}
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static const struct regmap_bus bmi270_regmap_bus = {
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.read = bmi270_regmap_spi_read,
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.write = bmi270_regmap_spi_write,
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};
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static const struct regmap_config bmi270_spi_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.pad_bits = 8,
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.read_flag_mask = BIT(7),
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};
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static int bmi270_spi_probe(struct spi_device *spi)
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{
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struct regmap *regmap;
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struct device *dev = &spi->dev;
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regmap = devm_regmap_init(dev, &bmi270_regmap_bus, dev,
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&bmi270_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 init i2c regmap");
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return bmi270_core_probe(dev, regmap);
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}
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static const struct spi_device_id bmi270_spi_id[] = {
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{ "bmi270" },
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{ }
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};
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static const struct of_device_id bmi270_of_match[] = {
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{ .compatible = "bosch,bmi270" },
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{ }
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};
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static struct spi_driver bmi270_spi_driver = {
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.driver = {
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.name = "bmi270",
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.of_match_table = bmi270_of_match,
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},
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.probe = bmi270_spi_probe,
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.id_table = bmi270_spi_id,
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};
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module_spi_driver(bmi270_spi_driver);
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MODULE_AUTHOR("Alex Lanzano");
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MODULE_DESCRIPTION("BMI270 driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(IIO_BMI270);