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 	/*
22 	 * setup interface registers
23 	 * This register write to REG_INTF_CONFIG6 enables a spike filter that
24 	 * is impacting the line and can prevent the I2C ACK to be seen by the
25 	 * controller. So we don't test the return value.
26 	 */
27 	regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
28 			   INV_ICM42600_INTF_CONFIG6_MASK,
29 			   INV_ICM42600_INTF_CONFIG6_I3C_EN);
30 
31 	ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
32 				 INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0);
33 	if (ret)
34 		return ret;
35 
36 	/* set slew rates for I2C and SPI */
37 	mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
38 	       INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
39 	val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_12_36NS) |
40 	      INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_12_36NS);
41 	ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
42 				 mask, val);
43 	if (ret)
44 		return ret;
45 
46 	/* disable SPI bus */
47 	return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
48 				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
49 				  INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS);
50 }
51 
52 static int inv_icm42600_probe(struct i2c_client *client)
53 {
54 	const void *match;
55 	enum inv_icm42600_chip chip;
56 	struct regmap *regmap;
57 
58 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
59 		return -ENOTSUPP;
60 
61 	match = device_get_match_data(&client->dev);
62 	if (!match)
63 		return -EINVAL;
64 	chip = (uintptr_t)match;
65 
66 	regmap = devm_regmap_init_i2c(client, &inv_icm42600_regmap_config);
67 	if (IS_ERR(regmap))
68 		return PTR_ERR(regmap);
69 
70 	return inv_icm42600_core_probe(regmap, chip, client->irq,
71 				       inv_icm42600_i2c_bus_setup);
72 }
73 
74 static const struct of_device_id inv_icm42600_of_matches[] = {
75 	{
76 		.compatible = "invensense,icm42600",
77 		.data = (void *)INV_CHIP_ICM42600,
78 	}, {
79 		.compatible = "invensense,icm42602",
80 		.data = (void *)INV_CHIP_ICM42602,
81 	}, {
82 		.compatible = "invensense,icm42605",
83 		.data = (void *)INV_CHIP_ICM42605,
84 	}, {
85 		.compatible = "invensense,icm42622",
86 		.data = (void *)INV_CHIP_ICM42622,
87 	},
88 	{}
89 };
90 MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
91 
92 static struct i2c_driver inv_icm42600_driver = {
93 	.driver = {
94 		.name = "inv-icm42600-i2c",
95 		.of_match_table = inv_icm42600_of_matches,
96 		.pm = &inv_icm42600_pm_ops,
97 	},
98 	.probe_new = inv_icm42600_probe,
99 };
100 module_i2c_driver(inv_icm42600_driver);
101 
102 MODULE_AUTHOR("InvenSense, Inc.");
103 MODULE_DESCRIPTION("InvenSense ICM-426xx I2C driver");
104 MODULE_LICENSE("GPL");
105