1/*
2 * Register map access API - AC'97 support
3 *
4 * Copyright 2013 Linaro Ltd. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <linux/clk.h>
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/io.h>
23#include <linux/module.h>
24#include <linux/regmap.h>
25#include <linux/slab.h>
26
27#include <sound/ac97_codec.h>
28
29bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
30{
31 switch (reg) {
32 case AC97_RESET:
33 case AC97_POWERDOWN:
34 case AC97_INT_PAGING:
35 case AC97_EXTENDED_ID:
36 case AC97_EXTENDED_STATUS:
37 case AC97_EXTENDED_MID:
38 case AC97_EXTENDED_MSTATUS:
39 case AC97_GPIO_STATUS:
40 case AC97_MISC_AFE:
41 case AC97_VENDOR_ID1:
42 case AC97_VENDOR_ID2:
43 case AC97_CODEC_CLASS_REV:
44 case AC97_PCI_SVID:
45 case AC97_PCI_SID:
46 case AC97_FUNC_SELECT:
47 case AC97_FUNC_INFO:
48 case AC97_SENSE_INFO:
49 return true;
50 default:
51 return false;
52 }
53}
54EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
55
56static int regmap_ac97_reg_read(void *context, unsigned int reg,
57 unsigned int *val)
58{
59 struct snd_ac97 *ac97 = context;
60
61 *val = ac97->bus->ops->read(ac97, reg);
62
63 return 0;
64}
65
66static int regmap_ac97_reg_write(void *context, unsigned int reg,
67 unsigned int val)
68{
69 struct snd_ac97 *ac97 = context;
70
71 ac97->bus->ops->write(ac97, reg, val);
72
73 return 0;
74}
75
76static const struct regmap_bus ac97_regmap_bus = {
77 .reg_write = regmap_ac97_reg_write,
78 .reg_read = regmap_ac97_reg_read,
79};
80
81struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
82 const struct regmap_config *config,
83 struct lock_class_key *lock_key,
84 const char *lock_name)
85{
86 return __regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
87 lock_key, lock_name);
88}
89EXPORT_SYMBOL_GPL(__regmap_init_ac97);
90
91struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
92 const struct regmap_config *config,
93 struct lock_class_key *lock_key,
94 const char *lock_name)
95{
96 return __devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
97 lock_key, lock_name);
98}
99EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
100
101MODULE_LICENSE("GPL v2");
102