From 7a23e6d922efc77e783084c4f3b2859c2a0bc7f3 Mon Sep 17 00:00:00 2001 From: Petre Rodan Date: Sun, 5 Oct 2025 16:12:23 +0300 Subject: [PATCH] iio: accel: bma220: add i2c module Add the bma220_i2c module. Note that this kernel module transparently shifts all register addresses 1 bit to the left, so all functions will operate based on the SPI memory map. Signed-off-by: Petre Rodan Signed-off-by: Jonathan Cameron --- drivers/iio/accel/Kconfig | 11 +++++-- drivers/iio/accel/Makefile | 1 + drivers/iio/accel/bma220.h | 1 + drivers/iio/accel/bma220_core.c | 18 ++++++++++ drivers/iio/accel/bma220_i2c.c | 58 +++++++++++++++++++++++++++++++++ 5 files changed, 87 insertions(+), 2 deletions(-) create mode 100644 drivers/iio/accel/bma220_i2c.c diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 988fe4b1f9a52..76911278fb217 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -218,10 +218,11 @@ config BMA180 config BMA220 tristate "Bosch BMA220 3-Axis Accelerometer Driver" - depends on SPI + depends on I2C || SPI select REGMAP select IIO_BUFFER select IIO_TRIGGERED_BUFFER + select BMA220_I2C if I2C select BMA220_SPI if SPI help Say yes here to add support for the Bosch BMA220 triaxial @@ -229,7 +230,13 @@ config BMA220 To compile this driver as a module, choose M here: the module will be called bma220_core and you will also get - bma220_spi if SPI is enabled. + bma220_i2c if I2C is enabled and bma220_spi if SPI is + enabled. + +config BMA220_I2C + tristate + select REGMAP_I2C + depends on BMA220 config BMA220_SPI tristate diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index 56a9f848f7f91..fa440a8592839 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_ADXL380_I2C) += adxl380_i2c.o obj-$(CONFIG_ADXL380_SPI) += adxl380_spi.o obj-$(CONFIG_BMA180) += bma180.o obj-$(CONFIG_BMA220) += bma220_core.o +obj-$(CONFIG_BMA220_I2C) += bma220_i2c.o obj-$(CONFIG_BMA220_SPI) += bma220_spi.o obj-$(CONFIG_BMA400) += bma400_core.o obj-$(CONFIG_BMA400_I2C) += bma400_i2c.o diff --git a/drivers/iio/accel/bma220.h b/drivers/iio/accel/bma220.h index 695f491bc5a03..e53ca63de54b4 100644 --- a/drivers/iio/accel/bma220.h +++ b/drivers/iio/accel/bma220.h @@ -13,6 +13,7 @@ struct device; +extern const struct regmap_config bma220_i2c_regmap_config; extern const struct regmap_config bma220_spi_regmap_config; extern const struct dev_pm_ops bma220_pm_ops; diff --git a/drivers/iio/accel/bma220_core.c b/drivers/iio/accel/bma220_core.c index 404fea26e3f72..050827bfb9e67 100644 --- a/drivers/iio/accel/bma220_core.c +++ b/drivers/iio/accel/bma220_core.c @@ -173,6 +173,24 @@ const struct regmap_config bma220_spi_regmap_config = { }; EXPORT_SYMBOL_NS_GPL(bma220_spi_regmap_config, "IIO_BOSCH_BMA220"); +/* + * Based on the datasheet the memory map differs between the SPI and the I2C + * implementations. I2C register addresses are simply shifted to the left + * by 1 bit yet the register size remains unchanged. + * This driver employs the SPI memory map to correlate register names to + * addresses regardless of the bus type. + */ + +const struct regmap_config bma220_i2c_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .reg_shift = -1, + .max_register = BMA220_REG_SOFTRESET, + .cache_type = REGCACHE_NONE, + .writeable_reg = bma220_is_writable_reg, +}; +EXPORT_SYMBOL_NS_GPL(bma220_i2c_regmap_config, "IIO_BOSCH_BMA220"); + static irqreturn_t bma220_trigger_handler(int irq, void *p) { int ret; diff --git a/drivers/iio/accel/bma220_i2c.c b/drivers/iio/accel/bma220_i2c.c new file mode 100644 index 0000000000000..5dc7c38f53b31 --- /dev/null +++ b/drivers/iio/accel/bma220_i2c.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Bosch triaxial acceleration sensor + * + * Copyright (c) 2025 Petre Rodan + * + * Datasheet: https://media.digikey.com/pdf/Data%20Sheets/Bosch/BMA220.pdf + * I2C address is either 0x0b or 0x0a depending on CSB (pin 10) + */ + +#include +#include +#include +#include +#include +#include + +#include "bma220.h" + +static int bma220_i2c_probe(struct i2c_client *client) +{ + struct regmap *regmap; + + regmap = devm_regmap_init_i2c(client, &bma220_i2c_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(&client->dev, PTR_ERR(regmap), + "failed to create regmap\n"); + + return bma220_common_probe(&client->dev, regmap, client->irq); +} + +static const struct of_device_id bma220_i2c_match[] = { + { .compatible = "bosch,bma220" }, + { } +}; +MODULE_DEVICE_TABLE(of, bma220_i2c_match); + +static const struct i2c_device_id bma220_i2c_id[] = { + { "bma220" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, bma220_i2c_id); + +static struct i2c_driver bma220_i2c_driver = { + .driver = { + .name = "bma220_i2c", + .pm = pm_sleep_ptr(&bma220_pm_ops), + .of_match_table = bma220_i2c_match, + }, + .probe = bma220_i2c_probe, + .id_table = bma220_i2c_id, +}; +module_i2c_driver(bma220_i2c_driver); + +MODULE_AUTHOR("Petre Rodan "); +MODULE_DESCRIPTION("Bosch triaxial acceleration sensor i2c driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_BOSCH_BMA220"); -- 2.47.3