[PATCH v2] iio: accel: bmi088: add i2c support for bmi088 accel driver

[Jun Yan]

The BMI088, BMI085 and BMI090L accelerometer also support
I2C protocol, so let's add the missing I2C support.

The I2C interface of the {BMI085,BMI088,BMI090L} is compatible with
the I2C Specification UM10204 Rev. 03 (19 June 2007), available at
http://www.nxp.com. The {BMI085,BMI088,BMI090L} supports I2C standard
mode and fast mode, only 7-bit address mode is supported.[1][2][3]

[1]: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi085-ds001.pdf
[2]: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi088-ds001.pdf
[3]: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4807/BST-BMI090L-DS000-00.pdf

Signed-off-by: Jun Yan <jerrysteve1101@xxxxxxxxx>

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202312191325.jfiyeL5F-lkp@xxxxxxxxx/

---

Changes in  v2:
- fix compile error
- Link to v1: https://lore.kernel.org/linux-iio/20231218154045.219317-1-jerrysteve1101@xxxxxxxxx/
- build-tested on linux-next

---
---
 drivers/iio/accel/Kconfig            |  8 +++-
 drivers/iio/accel/Makefile           |  1 +
 drivers/iio/accel/bmi088-accel-i2c.c | 69 ++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+), 2 deletions(-)
 create mode 100644 drivers/iio/accel/bmi088-accel-i2c.c

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 91adcac875a4..dc92cf599acb 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -254,11 +254,11 @@ config BMC150_ACCEL_SPI
 
 config BMI088_ACCEL
 	tristate "Bosch BMI088 Accelerometer Driver"
-	depends on SPI
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	select REGMAP
-	select BMI088_ACCEL_SPI
+	select BMI088_ACCEL_SPI if SPI
+	select BMI088_ACCEL_I2C if I2C
 	help
 	  Say yes here to build support for the following Bosch accelerometers:
 	  BMI088, BMI085, BMI090L. Note that all of these are combo module that
@@ -267,6 +267,10 @@ config BMI088_ACCEL
 	  This driver only implements the accelerometer part, which has its own
 	  address and register map. BMG160 provides the gyroscope driver.
 
+config BMI088_ACCEL_I2C
+	tristate
+	select REGMAP_I2C
+
 config BMI088_ACCEL_SPI
 	tristate
 	select REGMAP_SPI
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 311ead9c3ef1..db90532ba24a 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
 obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
 obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
 obj-$(CONFIG_BMI088_ACCEL) += bmi088-accel-core.o
+obj-$(CONFIG_BMI088_ACCEL_I2C) += bmi088-accel-i2c.o
 obj-$(CONFIG_BMI088_ACCEL_SPI) += bmi088-accel-spi.o
 obj-$(CONFIG_DA280)	+= da280.o
 obj-$(CONFIG_DA311)	+= da311.o
diff --git a/drivers/iio/accel/bmi088-accel-i2c.c b/drivers/iio/accel/bmi088-accel-i2c.c
new file mode 100644
index 000000000000..642dc2607943
--- /dev/null
+++ b/drivers/iio/accel/bmi088-accel-i2c.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
+ *  - BMI088
+ *  - BMI085
+ *  - BMI090L
+ *
+ * Copyright 2023 Jun Yan <jerrysteve1101@xxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+
+#include "bmi088-accel.h"
+
+static int bmi088_accel_probe(struct i2c_client *i2c)
+{
+	struct regmap *regmap;
+	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
+
+	regmap = devm_regmap_init_i2c(i2c, &bmi088_regmap_conf);
+	if (IS_ERR(regmap)) {
+		dev_err(&i2c->dev, "Failed to initialize i2c regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return bmi088_accel_core_probe(&i2c->dev, regmap, i2c->irq,
+					id->driver_data);
+}
+
+static void bmi088_accel_remove(struct i2c_client *i2c)
+{
+	bmi088_accel_core_remove(&i2c->dev);
+}
+
+static const struct of_device_id bmi088_of_match[] = {
+	{ .compatible = "bosch,bmi085-accel" },
+	{ .compatible = "bosch,bmi088-accel" },
+	{ .compatible = "bosch,bmi090l-accel" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, bmi088_of_match);
+
+static const struct i2c_device_id bmi088_accel_id[] = {
+	{"bmi085-accel",  BOSCH_BMI085},
+	{"bmi088-accel",  BOSCH_BMI088},
+	{"bmi090l-accel", BOSCH_BMI090L},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, bmi088_accel_id);
+
+static struct i2c_driver bmi088_accel_driver = {
+	.driver = {
+		.name	= "bmi088_accel_i2c",
+		.pm	= pm_ptr(&bmi088_accel_pm_ops),
+		.of_match_table = bmi088_of_match,
+	},
+	.probe		= bmi088_accel_probe,
+	.remove		= bmi088_accel_remove,
+	.id_table	= bmi088_accel_id,
+};
+module_i2c_driver(bmi088_accel_driver);
+
+MODULE_AUTHOR("Jun Yan <jerrysteve1101@xxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("BMI088 accelerometer driver (I2C)");
+MODULE_IMPORT_NS(IIO_BMI088);
-- 
2.43.0