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 
17 bool 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 }
42 EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
43 
44 static 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 
54 static 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 
64 static const struct regmap_bus ac97_regmap_bus = {
65 	.reg_write = regmap_ac97_reg_write,
66 	.reg_read = regmap_ac97_reg_read,
67 };
68 
69 struct 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 }
77 EXPORT_SYMBOL_GPL(__regmap_init_ac97);
78 
79 struct 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 }
87 EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
88 
89 MODULE_LICENSE("GPL v2");
90