[PATCH v3 5/8] iio: imu: inv_icm45600: add I2C driver for inv_icm45600 driver

[Remi Buisson via B4 Relay <devnull+remi.buisson.tdk.com@kernel.org>]

From: Remi Buisson <remi.buisson@tdk.com>

Add I2C driver for InvenSense ICM-456000 devices.

Signed-off-by: Remi Buisson <remi.buisson@tdk.com>
---
 drivers/iio/imu/inv_icm45600/Kconfig            | 21 ++++++
 drivers/iio/imu/inv_icm45600/Makefile           |  3 +
 drivers/iio/imu/inv_icm45600/inv_icm45600_i2c.c | 98 +++++++++++++++++++++++++
 3 files changed, 122 insertions(+)

diff --git a/drivers/iio/imu/inv_icm45600/Kconfig b/drivers/iio/imu/inv_icm45600/Kconfig
index ea0a8d20cba26549b74105fa6fdbca1ddb222633..5b044a954e952ffa8e44507eea42872e1f3161bc 100644
--- a/drivers/iio/imu/inv_icm45600/Kconfig
+++ b/drivers/iio/imu/inv_icm45600/Kconfig
@@ -5,3 +5,24 @@ config INV_ICM45600
 	select IIO_BUFFER
 	select IIO_KFIFO_BUF
 	select IIO_INV_SENSORS_TIMESTAMP
+
+config INV_ICM45600_I2C
+	tristate "InvenSense ICM-456xx I2C driver"
+	depends on I2C
+	select INV_ICM45600
+	select REGMAP_I2C
+	help
+	  This driver supports the InvenSense ICM-456xx motion tracking
+	  devices over I2C.
+	  Supported devices:
+	  - ICM-45605
+	  - ICM-45606
+	  - ICM-45608
+	  - ICM-45634
+	  - ICM-45686
+	  - ICM-45687
+	  - ICM-45688-P
+	  - ICM-45689
+
+	  This driver can be built as a module. The module will be called
+	  inv-icm45600-i2c.
diff --git a/drivers/iio/imu/inv_icm45600/Makefile b/drivers/iio/imu/inv_icm45600/Makefile
index ced5e1d9f2c10400cfa4878146672d41f815c22a..371585e29e92e78a30c7d40c1389548fa22a999a 100644
--- a/drivers/iio/imu/inv_icm45600/Makefile
+++ b/drivers/iio/imu/inv_icm45600/Makefile
@@ -5,3 +5,6 @@ inv-icm45600-y += inv_icm45600_core.o
 inv-icm45600-y += inv_icm45600_buffer.o
 inv-icm45600-y += inv_icm45600_accel.o
 inv-icm45600-y += inv_icm45600_gyro.o
+
+obj-$(CONFIG_INV_ICM45600_I2C) += inv-icm45600-i2c.o
+inv-icm45600-i2c-y += inv_icm45600_i2c.o
\ No newline at end of file
diff --git a/drivers/iio/imu/inv_icm45600/inv_icm45600_i2c.c b/drivers/iio/imu/inv_icm45600/inv_icm45600_i2c.c
new file mode 100644
index 0000000000000000000000000000000000000000..5ebc18121a11f8ad576efb4d4cf80091c13af31d
--- /dev/null
+++ b/drivers/iio/imu/inv_icm45600/inv_icm45600_i2c.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (C) 2025 InvenSense, Inc. */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+
+#include "inv_icm45600.h"
+
+static const struct regmap_config inv_icm45600_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int inv_icm45600_probe(struct i2c_client *client)
+{
+	const struct inv_icm45600_chip_info *chip_info;
+	struct regmap *regmap;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -ENODEV;
+
+	chip_info = device_get_match_data(&client->dev);
+	if (!chip_info)
+		return -ENODEV;
+
+	regmap = devm_regmap_init_i2c(client, &inv_icm45600_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	return inv_icm45600_core_probe(regmap, chip_info, true, NULL);
+}
+
+/*
+ * The device id table is used to identify which device is
+ * supported by this driver.
+ */
+static const struct i2c_device_id inv_icm45600_id[] = {
+	{ "icm45605", (kernel_ulong_t)&inv_icm45605_chip_info },
+	{ "icm45606", (kernel_ulong_t)&inv_icm45606_chip_info },
+	{ "icm45608", (kernel_ulong_t)&inv_icm45608_chip_info },
+	{ "icm45634", (kernel_ulong_t)&inv_icm45634_chip_info },
+	{ "icm45686", (kernel_ulong_t)&inv_icm45686_chip_info },
+	{ "icm45687", (kernel_ulong_t)&inv_icm45687_chip_info },
+	{ "icm45688p", (kernel_ulong_t)&inv_icm45688p_chip_info },
+	{ "icm45689", (kernel_ulong_t)&inv_icm45689_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, inv_icm45600_id);
+
+static const struct of_device_id inv_icm45600_of_matches[] = {
+	{
+		.compatible = "invensense,icm45605",
+		.data = &inv_icm45605_chip_info,
+	}, {
+		.compatible = "invensense,icm45606",
+		.data = &inv_icm45606_chip_info,
+	}, {
+		.compatible = "invensense,icm45608",
+		.data = &inv_icm45608_chip_info,
+	}, {
+		.compatible = "invensense,icm45634",
+		.data = &inv_icm45634_chip_info,
+	}, {
+		.compatible = "invensense,icm45686",
+		.data = &inv_icm45686_chip_info,
+	}, {
+		.compatible = "invensense,icm45687",
+		.data = &inv_icm45687_chip_info,
+	}, {
+		.compatible = "invensense,icm45688p",
+		.data = &inv_icm45688p_chip_info,
+	}, {
+		.compatible = "invensense,icm45689",
+		.data = &inv_icm45689_chip_info,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, inv_icm45600_of_matches);
+
+static struct i2c_driver inv_icm45600_driver = {
+	.driver = {
+		.name = "inv-icm45600-i2c",
+		.of_match_table = inv_icm45600_of_matches,
+		.pm = pm_ptr(&inv_icm45600_pm_ops),
+	},
+	.id_table = inv_icm45600_id,
+	.probe = inv_icm45600_probe,
+};
+module_i2c_driver(inv_icm45600_driver);
+
+MODULE_AUTHOR("InvenSense, Inc.");
+MODULE_DESCRIPTION("InvenSense ICM-456xx I2C driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_ICM45600");

-- 
2.34.1