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 
cs42l43_i2c_remove(struct i2c_client * i2c)59 static void cs42l43_i2c_remove(struct i2c_client *i2c)
60 {
61 	struct cs42l43 *cs42l43 = dev_get_drvdata(&i2c->dev);
62 
63 	cs42l43_dev_remove(cs42l43);
64 }
65 
66 #if IS_ENABLED(CONFIG_OF)
67 static const struct of_device_id cs42l43_of_match[] = {
68 	{ .compatible = "cirrus,cs42l43", },
69 	{}
70 };
71 MODULE_DEVICE_TABLE(of, cs42l43_of_match);
72 #endif
73 
74 #if IS_ENABLED(CONFIG_ACPI)
75 static const struct acpi_device_id cs42l43_acpi_match[] = {
76 	{ "CSC4243", 0 },
77 	{}
78 };
79 MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match);
80 #endif
81 
82 static struct i2c_driver cs42l43_i2c_driver = {
83 	.driver = {
84 		.name			= "cs42l43",
85 		.pm			= pm_ptr(&cs42l43_pm_ops),
86 		.of_match_table		= of_match_ptr(cs42l43_of_match),
87 		.acpi_match_table	= ACPI_PTR(cs42l43_acpi_match),
88 	},
89 
90 	.probe		= cs42l43_i2c_probe,
91 	.remove		= cs42l43_i2c_remove,
92 };
93 module_i2c_driver(cs42l43_i2c_driver);
94 
95 MODULE_IMPORT_NS(MFD_CS42L43);
96 
97 MODULE_DESCRIPTION("CS42L43 I2C Driver");
98 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
99 MODULE_LICENSE("GPL");
100