1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2020 InvenSense, Inc.
4  */
5 
6 #include <linux/kernel.h>
7 #include <linux/device.h>
8 #include <linux/module.h>
9 #include <linux/mod_devicetable.h>
10 #include <linux/i2c.h>
11 #include <linux/regmap.h>
12 #include <linux/property.h>
13 
14 #include "inv_icm42600.h"
15 
16 static int inv_icm42600_i2c_bus_setup(struct inv_icm42600_state *st)
17 {
18 	unsigned int mask, val;
19 	int ret;
20 
21 	/* setup interface registers */
22 	ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
23 				 INV_ICM42600_INTF_CONFIG6_MASK,
24 				 INV_ICM42600_INTF_CONFIG6_I3C_EN);
25 	if (ret)
26 		return ret;
27 
28 	ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
29 				 INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0);
30 	if (ret)
31 		return ret;
32 
33 	/* set slew rates for I2C and SPI */
34 	mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
35 	       INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
36 	val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_12_36NS) |
37 	      INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_12_36NS);
38 	ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
39 				 mask, val);
40 	if (ret)
41 		return ret;
42 
43 	/* disable SPI bus */
44 	return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
45 				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
46 				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS);
47 }
48 
49 static int inv_icm42600_probe(struct i2c_client *client)
50 {
51 	const void *match;
52 	enum inv_icm42600_chip chip;
53 	struct regmap *regmap;
54 
55 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
56 		return -ENOTSUPP;
57 
58 	match = device_get_match_data(&client->dev);
59 	if (!match)
60 		return -EINVAL;
61 	chip = (uintptr_t)match;
62 
63 	regmap = devm_regmap_init_i2c(client, &inv_icm42600_regmap_config);
64 	if (IS_ERR(regmap))
65 		return PTR_ERR(regmap);
66 
67 	return inv_icm42600_core_probe(regmap, chip, client->irq,
68 				       inv_icm42600_i2c_bus_setup);
69 }
70 
71 static const struct of_device_id inv_icm42600_of_matches[] = {
72 	{
73 		.compatible = "invensense,icm42600",
74 		.data = (void *)INV_CHIP_ICM42600,
75 	}, {
76 		.compatible = "invensense,icm42602",
77 		.data = (void *)INV_CHIP_ICM42602,
78 	}, {
79 		.compatible = "invensense,icm42605",
80 		.data = (void *)INV_CHIP_ICM42605,
81 	}, {
82 		.compatible = "invensense,icm42622",
83 		.data = (void *)INV_CHIP_ICM42622,
84 	},
85 	{}
86 };
87 MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
88 
89 static struct i2c_driver inv_icm42600_driver = {
90 	.driver = {
91 		.name = "inv-icm42600-i2c",
92 		.of_match_table = inv_icm42600_of_matches,
93 		.pm = &inv_icm42600_pm_ops,
94 	},
95 	.probe_new = inv_icm42600_probe,
96 };
97 module_i2c_driver(inv_icm42600_driver);
98 
99 MODULE_AUTHOR("InvenSense, Inc.");
100 MODULE_DESCRIPTION("InvenSense ICM-426xx I2C driver");
101 MODULE_LICENSE("GPL");
102