linux-kernel - [v3 12/13] iio: imu: add BNO055 I2C driver

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Date:   Thu, 17 Feb 2022 17:27:09 +0100
From:   Andrea Merello <andrea.merello@...il.com>
To:     jic23@...nel.org, mchehab+huawei@...nel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     lars@...afoo.de, robh+dt@...nel.org, andy.shevchenko@...il.com,
        matt.ranostay@...sulko.com, ardeleanalex@...il.com,
        jacopo@...ndi.org, Andrea Merello <andrea.merello@...il.com>,
        Andrea Merello <andrea.merello@....it>
Subject: [v3 12/13] iio: imu: add BNO055 I2C driver

This path adds an I2C driver for communicating to a BNO055 IMU via I2C
bus and it enables the BNO055 core driver to work in this scenario.

Signed-off-by: Andrea Merello <andrea.merello@....it>
---
 drivers/iio/imu/bno055/Kconfig      | 11 +++++++
 drivers/iio/imu/bno055/Makefile     |  1 +
 drivers/iio/imu/bno055/bno055_i2c.c | 50 +++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+)
 create mode 100644 drivers/iio/imu/bno055/bno055_i2c.c

diff --git a/drivers/iio/imu/bno055/Kconfig b/drivers/iio/imu/bno055/Kconfig
index 8a83639ad2a9..3693a408e270 100644
--- a/drivers/iio/imu/bno055/Kconfig
+++ b/drivers/iio/imu/bno055/Kconfig
@@ -12,3 +12,14 @@ config BOSCH_BNO055_SERIAL
 
 	  This driver can also be built as a module. If so, the module will be
 	  called bno055_sl.
+
+config BOSCH_BNO055_I2C
+	tristate "Bosch BNO055 attached via I2C bus"
+	depends on I2C
+	select REGMAP_I2C
+	select BOSCH_BNO055_IIO
+	help
+	  Enable this to support Bosch BNO055 IMUs attached via I2C bus.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called bno055_i2c.
diff --git a/drivers/iio/imu/bno055/Makefile b/drivers/iio/imu/bno055/Makefile
index 416f0ff96de5..2fe2b0857903 100644
--- a/drivers/iio/imu/bno055/Makefile
+++ b/drivers/iio/imu/bno055/Makefile
@@ -2,3 +2,4 @@
 
 obj-$(CONFIG_BOSCH_BNO055_IIO) += bno055.o
 obj-$(CONFIG_BOSCH_BNO055_SERIAL) += bno055_sl.o
+obj-$(CONFIG_BOSCH_BNO055_I2C) += bno055_i2c.o
diff --git a/drivers/iio/imu/bno055/bno055_i2c.c b/drivers/iio/imu/bno055/bno055_i2c.c
new file mode 100644
index 000000000000..9900e2a4d905
--- /dev/null
+++ b/drivers/iio/imu/bno055/bno055_i2c.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for I2C-interfaced Bosch BNO055 IMU.
+ *
+ * Copyright (C) 2021 Istituto Italiano di Tecnologia
+ * Electronic Design Laboratory
+ * Written by Andrea Merello <andrea.merello@....it>
+ */
+
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/module.h>
+
+#include "bno055.h"
+
+#define BNO055_I2C_XFER_BURST_BREAK_THRESHOLD 3 /* FIXME */
+
+static int bno055_i2c_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	struct regmap *regmap =
+		devm_regmap_init_i2c(client, &bno055_regmap_config);
+
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Unable to init register map");
+		return PTR_ERR(regmap);
+	}
+
+	return bno055_probe(&client->dev, regmap,
+			    BNO055_I2C_XFER_BURST_BREAK_THRESHOLD, true);
+}
+
+static const struct i2c_device_id bno055_i2c_id[] = {
+	{"bno055", 0},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, bno055_i2c_id);
+
+static struct i2c_driver bno055_driver = {
+	.driver = {
+		.name = "bno055-i2c",
+	},
+	.probe = bno055_i2c_probe,
+	.id_table = bno055_i2c_id
+};
+module_i2c_driver(bno055_driver);
+
+MODULE_AUTHOR("Andrea Merello");
+MODULE_DESCRIPTION("Bosch BNO055 I2C interface");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1