linux-kernel - [PATCH 4/8] iio: imu: inv_icm45600: add I3C driver for inv

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Message-Id: <20250411-add_newport_driver-v1-4-15082160b019@tdk.com>
Date: Fri, 11 Apr 2025 13:28:36 +0000
From: Remi Buisson via B4 Relay <devnull+remi.buisson.tdk.com@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
 devicetree@...r.kernel.org, Remi Buisson <remi.buisson@....com>
Subject: [PATCH 4/8] iio: imu: inv_icm45600: add I3C driver for
 inv_icm45600 driver

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

Add I3C driver for InvenSense ICM-456xxx devices.

Signed-off-by: Remi Buisson <remi.buisson@....com>
---
 drivers/iio/imu/inv_icm45600/inv_icm45600_i3c.c | 84 +++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/drivers/iio/imu/inv_icm45600/inv_icm45600_i3c.c b/drivers/iio/imu/inv_icm45600/inv_icm45600_i3c.c
new file mode 100644
index 0000000000000000000000000000000000000000..da939a5da5da88cbbb4a41edd90deae950cb9760
--- /dev/null
+++ b/drivers/iio/imu/inv_icm45600/inv_icm45600_i3c.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2025 InvenSense, Inc.
+ */
+
+#include <linux/i3c/device.h>
+#include <linux/i3c/master.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "inv_icm45600.h"
+
+static const struct regmap_config inv_icm45600_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct i3c_device_id inv_icm45600_i3c_ids[] = {
+	I3C_DEVICE_EXTRA_INFO(0x0235, 0x0000, 0x0011, (void *)NULL),
+	I3C_DEVICE_EXTRA_INFO(0x0235, 0x0000, 0x0084, (void *)NULL),
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(i3c, inv_icm45600_i3c_ids);
+
+static const uint8_t inv_icm45600_i3c_code[INV_CHIP_NB] = {
+	[INV_CHIP_ICM45605] = INV_ICM45600_WHOAMI_ICM45605,
+	[INV_CHIP_ICM45686] = INV_ICM45600_WHOAMI_ICM45686,
+	[INV_CHIP_ICM45688P] = INV_ICM45600_WHOAMI_ICM45688P,
+	[INV_CHIP_ICM45608] = INV_ICM45600_WHOAMI_ICM45608,
+	[INV_CHIP_ICM45634] = INV_ICM45600_WHOAMI_ICM45634,
+	[INV_CHIP_ICM45689] = INV_ICM45600_WHOAMI_ICM45689,
+	[INV_CHIP_ICM45606] = INV_ICM45600_WHOAMI_ICM45606,
+	[INV_CHIP_ICM45687] = INV_ICM45600_WHOAMI_ICM45687
+};
+
+static int inv_icm45600_i3c_probe(struct i3c_device *i3cdev)
+{
+	int ret;
+	unsigned int whoami;
+	enum inv_icm45600_chip chip;
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i3c(i3cdev, &inv_icm45600_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&i3cdev->dev, "Failed to register i3c regmap %ld\n", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	ret = regmap_read(regmap, INV_ICM45600_REG_WHOAMI, &whoami);
+	if (ret) {
+		dev_err(&i3cdev->dev, "Failed to read part id %d\n", whoami);
+		return ret;
+	}
+
+	for (chip = INV_CHIP_ICM45605; chip < INV_CHIP_NB; chip++) {
+		if (whoami == inv_icm45600_i3c_code[chip])
+			break;
+	}
+
+	if (chip == INV_CHIP_NB) {
+		dev_err(&i3cdev->dev, "Failed to match part id %d\n", whoami);
+		return -ENODEV;
+	}
+
+	return inv_icm45600_core_probe(regmap, chip, false, NULL);
+}
+
+static struct i3c_driver inv_icm45600_driver = {
+	.driver = {
+		.name = "inv_icm45600_i3c",
+		.pm = pm_sleep_ptr(&inv_icm45600_pm_ops),
+	},
+	.probe = inv_icm45600_i3c_probe,
+	.id_table = inv_icm45600_i3c_ids,
+};
+module_i3c_driver(inv_icm45600_driver);
+
+MODULE_AUTHOR("Remi Buisson <remi.buisson@....com>");
+MODULE_DESCRIPTION("InvenSense ICM-456xx i3c driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_ICM45600");

-- 
2.34.1