1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * CS42L43 I2C driver
4 *
5 * Copyright (C) 2022-2023 Cirrus Logic, Inc. and
6 * Cirrus Logic International Semiconductor Ltd.
7 */
8
9 #include <linux/array_size.h>
10 #include <linux/err.h>
11 #include <linux/i2c.h>
12 #include <linux/mfd/cs42l43.h>
13 #include <linux/mfd/cs42l43-regs.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/module.h>
16 #include <linux/pm.h>
17 #include <linux/regmap.h>
18
19 #include "cs42l43.h"
20
21 static const struct regmap_config cs42l43_i2c_regmap = {
22 .reg_bits = 32,
23 .reg_stride = 4,
24 .val_bits = 32,
25 .reg_format_endian = REGMAP_ENDIAN_BIG,
26 .val_format_endian = REGMAP_ENDIAN_BIG,
27
28 .max_register = CS42L43_MCU_RAM_MAX,
29 .readable_reg = cs42l43_readable_register,
30 .volatile_reg = cs42l43_volatile_register,
31 .precious_reg = cs42l43_precious_register,
32
33 .cache_type = REGCACHE_MAPLE,
34 .reg_defaults = cs42l43_reg_default,
35 .num_reg_defaults = ARRAY_SIZE(cs42l43_reg_default),
36 };
37
cs42l43_i2c_probe(struct i2c_client * i2c)38 static int cs42l43_i2c_probe(struct i2c_client *i2c)
39 {
40 struct cs42l43 *cs42l43;
41
42 cs42l43 = devm_kzalloc(&i2c->dev, sizeof(*cs42l43), GFP_KERNEL);
43 if (!cs42l43)
44 return -ENOMEM;
45
46 cs42l43->dev = &i2c->dev;
47 cs42l43->irq = i2c->irq;
48 /* A device on an I2C is always attached by definition. */
49 cs42l43->attached = true;
50
51 cs42l43->regmap = devm_regmap_init_i2c(i2c, &cs42l43_i2c_regmap);
52 if (IS_ERR(cs42l43->regmap))
53 return dev_err_probe(cs42l43->dev, PTR_ERR(cs42l43->regmap),
54 "Failed to allocate regmap\n");
55
56 return cs42l43_dev_probe(cs42l43);
57 }
58
59 #if IS_ENABLED(CONFIG_OF)
60 static const struct of_device_id cs42l43_of_match[] = {
61 { .compatible = "cirrus,cs42l43", },
62 {}
63 };
64 MODULE_DEVICE_TABLE(of, cs42l43_of_match);
65 #endif
66
67 #if IS_ENABLED(CONFIG_ACPI)
68 static const struct acpi_device_id cs42l43_acpi_match[] = {
69 { "CSC4243", 0 },
70 {}
71 };
72 MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match);
73 #endif
74
75 static struct i2c_driver cs42l43_i2c_driver = {
76 .driver = {
77 .name = "cs42l43",
78 .pm = pm_ptr(&cs42l43_pm_ops),
79 .of_match_table = of_match_ptr(cs42l43_of_match),
80 .acpi_match_table = ACPI_PTR(cs42l43_acpi_match),
81 },
82
83 .probe = cs42l43_i2c_probe,
84 };
85 module_i2c_driver(cs42l43_i2c_driver);
86
87 MODULE_IMPORT_NS("MFD_CS42L43");
88
89 MODULE_DESCRIPTION("CS42L43 I2C Driver");
90 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
91 MODULE_LICENSE("GPL");
92