1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SPI bus interface to Cirrus Logic Madera codecs
4 *
5 * Copyright (C) 2015-2018 Cirrus Logic
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; version 2.
10 */
11
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17#include <linux/regmap.h>
18#include <linux/spi/spi.h>
19
20#include <linux/mfd/madera/core.h>
21
22#include "madera.h"
23
24static int madera_spi_probe(struct spi_device *spi)
25{
26 const struct spi_device_id *id = spi_get_device_id(spi);
27 struct madera *madera;
28 const struct regmap_config *regmap_16bit_config = NULL;
29 const struct regmap_config *regmap_32bit_config = NULL;
30 const void *of_data;
31 unsigned long type;
32 const char *name;
33 int ret;
34
35 of_data = of_device_get_match_data(&spi->dev);
36 if (of_data)
37 type = (unsigned long)of_data;
38 else
39 type = id->driver_data;
40
41 switch (type) {
42 case CS47L35:
43 if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
44 regmap_16bit_config = &cs47l35_16bit_spi_regmap;
45 regmap_32bit_config = &cs47l35_32bit_spi_regmap;
46 }
47 break;
48 case CS47L85:
49 case WM1840:
50 if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
51 regmap_16bit_config = &cs47l85_16bit_spi_regmap;
52 regmap_32bit_config = &cs47l85_32bit_spi_regmap;
53 }
54 break;
55 case CS47L90:
56 case CS47L91:
57 if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
58 regmap_16bit_config = &cs47l90_16bit_spi_regmap;
59 regmap_32bit_config = &cs47l90_32bit_spi_regmap;
60 }
61 break;
62 default:
63 dev_err(&spi->dev,
64 "Unknown Madera SPI device type %ld\n", type);
65 return -EINVAL;
66 }
67
68 name = madera_name_from_type(type);
69
70 if (!regmap_16bit_config) {
71 /* it's polite to say which codec isn't built into the kernel */
72 dev_err(&spi->dev,
73 "Kernel does not include support for %s\n", name);
74 return -EINVAL;
75 }
76
77 madera = devm_kzalloc(&spi->dev, sizeof(*madera), GFP_KERNEL);
78 if (!madera)
79 return -ENOMEM;
80
81 madera->regmap = devm_regmap_init_spi(spi, regmap_16bit_config);
82 if (IS_ERR(madera->regmap)) {
83 ret = PTR_ERR(madera->regmap);
84 dev_err(&spi->dev,
85 "Failed to allocate 16-bit register map: %d\n", ret);
86 return ret;
87 }
88
89 madera->regmap_32bit = devm_regmap_init_spi(spi, regmap_32bit_config);
90 if (IS_ERR(madera->regmap_32bit)) {
91 ret = PTR_ERR(madera->regmap_32bit);
92 dev_err(&spi->dev,
93 "Failed to allocate 32-bit register map: %d\n", ret);
94 return ret;
95 }
96
97 madera->type = type;
98 madera->type_name = name;
99 madera->dev = &spi->dev;
100 madera->irq = spi->irq;
101
102 return madera_dev_init(madera);
103}
104
105static int madera_spi_remove(struct spi_device *spi)
106{
107 struct madera *madera = spi_get_drvdata(spi);
108
109 madera_dev_exit(madera);
110
111 return 0;
112}
113
114static const struct spi_device_id madera_spi_ids[] = {
115 { "cs47l35", CS47L35 },
116 { "cs47l85", CS47L85 },
117 { "cs47l90", CS47L90 },
118 { "cs47l91", CS47L91 },
119 { "wm1840", WM1840 },
120 { }
121};
122MODULE_DEVICE_TABLE(spi, madera_spi_ids);
123
124static struct spi_driver madera_spi_driver = {
125 .driver = {
126 .name = "madera",
127 .pm = &madera_pm_ops,
128 .of_match_table = of_match_ptr(madera_of_match),
129 },
130 .probe = madera_spi_probe,
131 .remove = madera_spi_remove,
132 .id_table = madera_spi_ids,
133};
134
135module_spi_driver(madera_spi_driver);
136
137MODULE_DESCRIPTION("Madera SPI bus interface");
138MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
139MODULE_LICENSE("GPL v2");
140