1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
// SPDX-License-Identifier: GPL-2.0
/*
* AVIRT - ALSA Virtual Soundcard
*
* Copyright (c) 2010-2019 Fiberdyne Systems Pty Ltd
*
* configfs.c - AVIRT sysfs support
*/
#include <linux/slab.h>
#include "core.h"
#define D_LOGNAME "sysfs"
#define D_INFOK(fmt, args...) DINFO(D_LOGNAME, fmt, ##args)
#define D_PRINTK(fmt, args...) DDEBUG(D_LOGNAME, fmt, ##args)
#define D_ERRORK(fmt, args...) DERROR(D_LOGNAME, fmt, ##args)
static struct kset *snd_avirt_audiopath_kset;
static struct kobject *kobj;
#define to_audiopath_obj(d) \
container_of(d, struct snd_avirt_audiopath_obj, kobj)
#define to_audiopath_attr(a) \
container_of(a, struct snd_avirt_audiopath_attribute, attr)
/**
* struct snd_avirt_audiopath_attribute - access the attributes of Audio Path
* @attr: attributes of an Audio Path
* @show: pointer to the show function
* @store: pointer to the store function
*/
struct snd_avirt_audiopath_attribute {
struct attribute attr;
ssize_t (*show)(struct snd_avirt_audiopath_obj *d,
struct snd_avirt_audiopath_attribute *attr, char *buf);
ssize_t (*store)(struct snd_avirt_audiopath_obj *d,
struct snd_avirt_audiopath_attribute *attr,
const char *buf, size_t count);
};
/**
* audiopath_attr_show - show function of an Audio Path
* @kobj: pointer to kobject
* @attr: pointer to attribute struct
* @buf: buffer
*/
static ssize_t audiopath_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct snd_avirt_audiopath_attribute *audiopath_attr;
struct snd_avirt_audiopath_obj *audiopath_obj;
audiopath_attr = to_audiopath_attr(attr);
audiopath_obj = to_audiopath_obj(kobj);
if (!audiopath_attr->show)
return -EIO;
return audiopath_attr->show(audiopath_obj, audiopath_attr, buf);
}
/**
* audiopath_attr_store - attribute store function of Audio Path object
* @kobj: pointer to kobject
* @attr: pointer to attribute struct
* @buf: buffer
* @len: length of buffer
*/
static ssize_t audiopath_attr_store(struct kobject *kobj,
struct attribute *attr, const char *buf,
size_t len)
{
struct snd_avirt_audiopath_attribute *audiopath_attr;
struct snd_avirt_audiopath_obj *audiopath_obj;
audiopath_attr = to_audiopath_attr(attr);
audiopath_obj = to_audiopath_obj(kobj);
if (!audiopath_attr->store)
return -EIO;
return audiopath_attr->store(audiopath_obj, audiopath_attr, buf, len);
}
static const struct sysfs_ops snd_avirt_audiopath_sysfs_ops = {
.show = audiopath_attr_show,
.store = audiopath_attr_store,
};
/**
* snd_avirt_audiopath_release - Audio Path release function
* @kobj: pointer to Audio Paths's kobject
*/
static void snd_avirt_audiopath_release(struct kobject *kobj)
{
struct snd_avirt_audiopath_obj *audiopath_obj = to_audiopath_obj(kobj);
kfree(audiopath_obj);
}
static ssize_t name_show(struct snd_avirt_audiopath_obj *audiopath_obj,
struct snd_avirt_audiopath_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", audiopath_obj->path->name);
}
static ssize_t version_show(struct snd_avirt_audiopath_obj *audiopath_obj,
struct snd_avirt_audiopath_attribute *attr,
char *buf)
{
struct snd_avirt_audiopath *audiopath = audiopath_obj->path;
return sprintf(buf, "%d.%d.%d\n", audiopath->version[0],
audiopath->version[1], audiopath->version[2]);
}
static struct snd_avirt_audiopath_attribute snd_avirt_audiopath_attrs[] = {
__ATTR_RO(name),
__ATTR_RO(version),
};
static struct attribute *snd_avirt_audiopath_def_attrs[] = {
&snd_avirt_audiopath_attrs[0].attr,
&snd_avirt_audiopath_attrs[1].attr,
NULL,
};
static struct kobj_type snd_avirt_audiopath_ktype = {
.sysfs_ops = &snd_avirt_audiopath_sysfs_ops,
.release = snd_avirt_audiopath_release,
.default_attrs = snd_avirt_audiopath_def_attrs,
};
struct snd_avirt_audiopath_obj *snd_avirt_audiopath_create_obj(const char *uid)
{
struct snd_avirt_audiopath_obj *snd_avirt_audiopath;
int retval;
snd_avirt_audiopath = kzalloc(sizeof(*snd_avirt_audiopath), GFP_KERNEL);
if (!snd_avirt_audiopath)
return NULL;
snd_avirt_audiopath->kobj.kset = snd_avirt_audiopath_kset;
retval = kobject_init_and_add(&snd_avirt_audiopath->kobj,
&snd_avirt_audiopath_ktype, kobj, "%s",
uid);
if (retval) {
kobject_put(&snd_avirt_audiopath->kobj);
return NULL;
}
kobject_uevent(&snd_avirt_audiopath->kobj, KOBJ_ADD);
return snd_avirt_audiopath;
}
void snd_avirt_audiopath_destroy_obj(struct snd_avirt_audiopath_obj *p)
{
kobject_put(&p->kobj);
}
int __init snd_avirt_sysfs_init(struct snd_avirt_core *core)
{
snd_avirt_audiopath_kset =
kset_create_and_add("audiopaths", NULL, &core->dev->kobj);
if (!snd_avirt_audiopath_kset)
return -ENOMEM;
return 0;
}
void __exit snd_avirt_sysfs_exit(struct snd_avirt_core *core)
{
kset_unregister(snd_avirt_audiopath_kset);
}
|
