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 
29 bool 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 }
54 EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
55 
56 static 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 
66 static 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 
76 static const struct regmap_bus ac97_regmap_bus = {
77 	.reg_write = regmap_ac97_reg_write,
78 	.reg_read = regmap_ac97_reg_read,
79 };
80 
81 /**
82  * regmap_init_ac97(): Initialise AC'97 register map
83  *
84  * @ac97: Device that will be interacted with
85  * @config: Configuration for register map
86  *
87  * The return value will be an ERR_PTR() on error or a valid pointer to
88  * a struct regmap.
89  */
90 struct regmap *regmap_init_ac97(struct snd_ac97 *ac97,
91 				const struct regmap_config *config)
92 {
93 	return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
94 }
95 EXPORT_SYMBOL_GPL(regmap_init_ac97);
96 
97 /**
98  * devm_regmap_init_ac97(): Initialise AC'97 register map
99  *
100  * @ac97: Device that will be interacted with
101  * @config: Configuration for register map
102  *
103  * The return value will be an ERR_PTR() on error or a valid pointer
104  * to a struct regmap.  The regmap will be automatically freed by the
105  * device management code.
106  */
107 struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97,
108 				     const struct regmap_config *config)
109 {
110 	return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
111 }
112 EXPORT_SYMBOL_GPL(devm_regmap_init_ac97);
113 
114 MODULE_LICENSE("GPL v2");
115