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
inv_icm42600_i2c_bus_setup(struct inv_icm42600_state * st)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
inv_icm42600_probe(struct i2c_client * client)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 = (enum inv_icm42600_chip)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