cs42l43-i2c.c

 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
21static 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
38static 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)
60static const struct of_device_id cs42l43_of_match[] = {
61	{ .compatible = "cirrus,cs42l43", },
62	{}
63};
64MODULE_DEVICE_TABLE(of, cs42l43_of_match);
65#endif
66
67#if IS_ENABLED(CONFIG_ACPI)
68static const struct acpi_device_id cs42l43_acpi_match[] = {
69	{ "CSC4243", 0 },
70	{}
71};
72MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match);
73#endif
74
75static 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};
85module_i2c_driver(cs42l43_i2c_driver);
86
87MODULE_IMPORT_NS("MFD_CS42L43");
88
89MODULE_DESCRIPTION("CS42L43 I2C Driver");
90MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
91MODULE_LICENSE("GPL");