1// SPDX-License-Identifier: GPL-2.0
2//
3// Register map access API - AC'97 support
4//
5// Copyright 2013 Linaro Ltd.  All rights reserved.
6
7#include <linux/clk.h>
8#include <linux/err.h>
9#include <linux/init.h>
10#include <linux/io.h>
11#include <linux/module.h>
12#include <linux/regmap.h>
13#include <linux/slab.h>
14
15#include <sound/ac97_codec.h>
16
17bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
18{
19	switch (reg) {
20	case AC97_RESET:
21	case AC97_POWERDOWN:
22	case AC97_INT_PAGING:
23	case AC97_EXTENDED_ID:
24	case AC97_EXTENDED_STATUS:
25	case AC97_EXTENDED_MID:
26	case AC97_EXTENDED_MSTATUS:
27	case AC97_GPIO_STATUS:
28	case AC97_MISC_AFE:
29	case AC97_VENDOR_ID1:
30	case AC97_VENDOR_ID2:
31	case AC97_CODEC_CLASS_REV:
32	case AC97_PCI_SVID:
33	case AC97_PCI_SID:
34	case AC97_FUNC_SELECT:
35	case AC97_FUNC_INFO:
36	case AC97_SENSE_INFO:
37		return true;
38	default:
39		return false;
40	}
41}
42EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
43
44static int regmap_ac97_reg_read(void *context, unsigned int reg,
45	unsigned int *val)
46{
47	struct snd_ac97 *ac97 = context;
48
49	*val = ac97->bus->ops->read(ac97, reg);
50
51	return 0;
52}
53
54static int regmap_ac97_reg_write(void *context, unsigned int reg,
55	unsigned int val)
56{
57	struct snd_ac97 *ac97 = context;
58
59	ac97->bus->ops->write(ac97, reg, val);
60
61	return 0;
62}
63
64static const struct regmap_bus ac97_regmap_bus = {
65	.reg_write = regmap_ac97_reg_write,
66	.reg_read = regmap_ac97_reg_read,
67};
68
69struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
70				  const struct regmap_config *config,
71				  struct lock_class_key *lock_key,
72				  const char *lock_name)
73{
74	return __regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
75			     lock_key, lock_name);
76}
77EXPORT_SYMBOL_GPL(__regmap_init_ac97);
78
79struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
80				       const struct regmap_config *config,
81				       struct lock_class_key *lock_key,
82				       const char *lock_name)
83{
84	return __devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
85				  lock_key, lock_name);
86}
87EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
88
89MODULE_LICENSE("GPL v2");
90