Commit 7a23e6d9 authored by Petre Rodan's avatar Petre Rodan Committed by Jonathan Cameron
Browse files

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: default avatarPetre Rodan <petre.rodan@subdimension.ro>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 0e3c7fd4

drivers/iio/accel/Kconfig

+9 −2
Original line number Diff line number Diff line
@@ -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

drivers/iio/accel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/iio/accel/bma220.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

drivers/iio/accel/bma220_core.c

+18 −0
Original line number Diff line number Diff line
@@ -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;

drivers/iio/accel/bma220_i2c.c

0 → 100644
+58 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Bosch triaxial acceleration sensor

 *

 * Copyright (c) 2025 Petre Rodan <petre.rodan@subdimension.ro>

 *

 * Datasheet: https://media.digikey.com/pdf/Data%20Sheets/Bosch/BMA220.pdf

 * I2C address is either 0x0b or 0x0a depending on CSB (pin 10)

 */



#include <linux/errno.h>

#include <linux/i2c.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/types.h>



#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 <petre.rodan@subdimension.ro>");

MODULE_DESCRIPTION("Bosch triaxial acceleration sensor i2c driver");

MODULE_LICENSE("GPL");

MODULE_IMPORT_NS("IIO_BOSCH_BMA220");