From nobody Fri Oct 3 12:26:33 2025 Received: from mail.subdimension.ro (nalicastle.subdimension.ro [172.105.74.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D74C32580CA; Mon, 1 Sep 2025 19:55:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=172.105.74.154 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756756510; cv=none; b=Gq/G7mS1pGJYSY2XehoJSotc9mwo7kDmal6qHJt+z+EoxLY85WaI2/2YR1LyCcwFQs5MVlTfWxySZTyf+HnEQrKyu7FkfUdIJ0nM97PxvPzmd/9BsXfLom6U36zOLrYBAX02fcprxeUbFO3SvCyatF5fG1xEXhyO/Kb8gI0JmUs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756756510; c=relaxed/simple; bh=tiZA4TdFvRoRUywLr07gSd71OMrtnadQIIVgAWv7o4g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ks6nhAS943M5OFVTAhItsJb8DXSxfjGP1nuBWONDJQdDHH/xbJhXo5ahJlo1G/inrUN5aO7StS3fPgIcjt/KiSh3bLIkrC1wxawdRbgQag1gTQG+JW4srOP1/nbyYtf8D6uD1hAwOMfDCcM1p59ATdyWtsZpl8iYDYuG4Anj15s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=subdimension.ro; spf=pass smtp.mailfrom=subdimension.ro; dkim=pass (2048-bit key) header.d=subdimension.ro header.i=@subdimension.ro header.b=z4e2INzR; arc=none smtp.client-ip=172.105.74.154 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=subdimension.ro Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=subdimension.ro Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=subdimension.ro header.i=@subdimension.ro header.b="z4e2INzR" Received: from localhost.localdomain (unknown [IPv6:2a02:2f0e:3503:4a00:e2d5:5eff:fed9:f1c4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mail.subdimension.ro (Postfix) with ESMTPSA id D7D4D173BEC; Mon, 01 Sep 2025 22:47:55 +0300 (EEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=subdimension.ro; s=mail; t=1756756076; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=A8j/QOXN0ugvgXWg9xQZTmkY/Q+gPIG4c4igm/P83LQ=; b=z4e2INzRV/MAHqiEbDA41yzf10tUE4IBe7mW/nYQvux3I6qXItt7kDgT/nrxUbdVKf87SZ vpvK/8VYnCPMWv5qazBUSmU4mLQQ/GGjbp0BtFZZ93IEg9snWEh3qgC3qvQMeGb78UiDGO OxUyM6VutQCbAslLOSjP0TxAlbHmqEukVslw4RnnGPE00IPURg99V4T8mnF/AmRPyq7sKW CToQxS7+qcM4M8KUiWmXQ6QVNNs/zg6XqpOKt/rYSf4P2xSlEU5RF932MhfA2kZIE1dA7w mS2ALcrgQX6Qt2bOSTFD7OQKSzFD/zAqTFh4vmbypdiAuYulWORBNpD6L4ySVA== From: Petre Rodan To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Petre Rodan , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko Subject: [PATCH 04/10] iio: accel: BMA220 add i2c module Date: Mon, 1 Sep 2025 22:47:30 +0300 Message-ID: <20250901194742.11599-5-petre.rodan@subdimension.ro> X-Mailer: git-send-email 2.49.1 In-Reply-To: <20250901194742.11599-1-petre.rodan@subdimension.ro> References: <20250901194742.11599-1-petre.rodan@subdimension.ro> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add i2c module. Note that the 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 --- drivers/iio/accel/Kconfig | 9 ++++- drivers/iio/accel/Makefile | 1 + drivers/iio/accel/bma220.h | 1 + drivers/iio/accel/bma220_core.c | 19 ++++++++++ drivers/iio/accel/bma220_i2c.c | 62 +++++++++++++++++++++++++++++++++ 5 files changed, 91 insertions(+), 1 deletion(-) create mode 100644 drivers/iio/accel/bma220_i2c.c diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 9b6c35b75948..b3c5b0b7a406 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -221,6 +221,7 @@ config BMA220 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 @@ -228,7 +229,13 @@ 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 56a9f848f7f9..fa440a859283 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_ADXL380_I2C) +=3D adxl380_i2c.o obj-$(CONFIG_ADXL380_SPI) +=3D adxl380_spi.o obj-$(CONFIG_BMA180) +=3D bma180.o obj-$(CONFIG_BMA220) +=3D bma220_core.o +obj-$(CONFIG_BMA220_I2C) +=3D bma220_i2c.o obj-$(CONFIG_BMA220_SPI) +=3D bma220_spi.o obj-$(CONFIG_BMA400) +=3D bma400_core.o obj-$(CONFIG_BMA400_I2C) +=3D bma400_i2c.o diff --git a/drivers/iio/accel/bma220.h b/drivers/iio/accel/bma220.h index 5eefa9749d33..ae4b74514629 100644 --- a/drivers/iio/accel/bma220.h +++ b/drivers/iio/accel/bma220.h @@ -13,6 +13,7 @@ #include extern const struct regmap_config bma220_spi_regmap_config; +extern const struct regmap_config bma220_i2c_regmap_config; extern const struct dev_pm_ops bma220_pm_ops; int bma220_common_probe(struct device *dev, struct regmap *regmap, int irq= ); diff --git a/drivers/iio/accel/bma220_core.c b/drivers/iio/accel/bma220_cor= e.c index e6dac2e1cf4d..fae84823d52b 100644 --- a/drivers/iio/accel/bma220_core.c +++ b/drivers/iio/accel/bma220_core.c @@ -225,6 +225,25 @@ const struct regmap_config bma220_spi_regmap_config = =3D { }; EXPORT_SYMBOL_NS(bma220_spi_regmap_config, "IIO_BOSCH_BMA220"); +/* + * Based on the datasheet the memory map differs between the SPI and the I= 2C + * 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 =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .reg_shift =3D -1, + .max_register =3D BMA220_REG_SOFTRESET, + .cache_type =3D REGCACHE_MAPLE, + .writeable_reg =3D bma220_is_writable_reg, + .volatile_reg =3D bma220_is_volatile_reg, +}; +EXPORT_SYMBOL_NS(bma220_i2c_regmap_config, "IIO_BOSCH_BMA220"); + static int bma220_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) { diff --git a/drivers/iio/accel/bma220_i2c.c b/drivers/iio/accel/bma220_i2c.c new file mode 100644 index 000000000000..8a1644aac287 --- /dev/null +++ b/drivers/iio/accel/bma220_i2c.c @@ -0,0 +1,62 @@ +// 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 + +#include + +#include "bma220.h" + +static int bma220_i2c_probe(struct i2c_client *client) +{ + struct regmap *regmap; + + regmap =3D devm_regmap_init_i2c(client, &bma220_i2c_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "failed to create regmap\n"); + return PTR_ERR(regmap); + } + + return bma220_common_probe(&client->dev, regmap, client->irq); +} + +static const struct of_device_id bma220_i2c_match[] =3D { + { .compatible =3D "bosch,bma220" }, + { } +}; +MODULE_DEVICE_TABLE(of, bma220_i2c_match); + +static const struct i2c_device_id bma220_i2c_id[] =3D { + { "bma220" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, bma220_i2c_id); + +static struct i2c_driver bma220_i2c_driver =3D { + .driver =3D { + .name =3D "bma220_i2c", + .pm =3D pm_sleep_ptr(&bma220_pm_ops), + .of_match_table =3D bma220_i2c_match, + }, + .probe =3D bma220_i2c_probe, + .id_table =3D 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"); -- 2.49.1