blob: 203361a64212d1b533dddf98ce1b05c41fc3fc23 (
plain)
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
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/usb/composite.h>
static LIST_HEAD(func_list);
static DEFINE_MUTEX(func_lock);
static struct usb_function_instance *try_get_usb_function_instance(const char *name)
{
struct usb_function_driver *fd;
struct usb_function_instance *fi;
fi = ERR_PTR(-ENOENT);
mutex_lock(&func_lock);
list_for_each_entry(fd, &func_list, list) {
if (strcmp(name, fd->name))
continue;
if (!try_module_get(fd->mod)) {
fi = ERR_PTR(-EBUSY);
break;
}
fi = fd->alloc_inst();
if (IS_ERR(fi))
module_put(fd->mod);
else
fi->fd = fd;
break;
}
mutex_unlock(&func_lock);
return fi;
}
struct usb_function_instance *usb_get_function_instance(const char *name)
{
struct usb_function_instance *fi;
int ret;
fi = try_get_usb_function_instance(name);
if (!IS_ERR(fi))
return fi;
ret = PTR_ERR(fi);
if (ret != -ENOENT)
return fi;
ret = request_module("usbfunc:%s", name);
if (ret < 0)
return ERR_PTR(ret);
return try_get_usb_function_instance(name);
}
EXPORT_SYMBOL_GPL(usb_get_function_instance);
struct usb_function *usb_get_function(struct usb_function_instance *fi)
{
struct usb_function *f;
f = fi->fd->alloc_func(fi);
if (IS_ERR(f))
return f;
f->fi = fi;
return f;
}
EXPORT_SYMBOL_GPL(usb_get_function);
void usb_put_function_instance(struct usb_function_instance *fi)
{
struct module *mod;
if (!fi)
return;
mod = fi->fd->mod;
fi->free_func_inst(fi);
module_put(mod);
}
EXPORT_SYMBOL_GPL(usb_put_function_instance);
void usb_put_function(struct usb_function *f)
{
if (!f)
return;
f->free_func(f);
}
EXPORT_SYMBOL_GPL(usb_put_function);
int usb_function_register(struct usb_function_driver *newf)
{
struct usb_function_driver *fd;
int ret;
ret = -EEXIST;
mutex_lock(&func_lock);
list_for_each_entry(fd, &func_list, list) {
if (!strcmp(fd->name, newf->name))
goto out;
}
ret = 0;
list_add_tail(&newf->list, &func_list);
out:
mutex_unlock(&func_lock);
return ret;
}
EXPORT_SYMBOL_GPL(usb_function_register);
void usb_function_unregister(struct usb_function_driver *fd)
{
mutex_lock(&func_lock);
list_del(&fd->list);
mutex_unlock(&func_lock);
}
EXPORT_SYMBOL_GPL(usb_function_unregister);
|
