1 #include <linux/kernel.h>
2 #include <linux/slab.h>
3 #include <linux/module.h>
6 #include <linux/usb/composite.h>
8 static LIST_HEAD(func_list);
9 static DEFINE_MUTEX(func_lock);
11 static struct usb_function_instance *try_get_usb_function_instance(const char *name)
13 struct usb_function_driver *fd;
14 struct usb_function_instance *fi;
16 fi = ERR_PTR(-ENOENT);
17 mutex_lock(&func_lock);
18 list_for_each_entry(fd, &func_list, list) {
20 if (strcmp(name, fd->name))
23 if (!try_module_get(fd->mod)) {
27 fi = fd->alloc_inst();
34 mutex_unlock(&func_lock);
38 struct usb_function_instance *usb_get_function_instance(const char *name)
40 struct usb_function_instance *fi;
43 fi = try_get_usb_function_instance(name);
49 ret = request_module("usbfunc:%s", name);
52 return try_get_usb_function_instance(name);
54 EXPORT_SYMBOL_GPL(usb_get_function_instance);
56 struct usb_function *usb_get_function(struct usb_function_instance *fi)
58 struct usb_function *f;
60 f = fi->fd->alloc_func(fi);
66 EXPORT_SYMBOL_GPL(usb_get_function);
68 void usb_put_function_instance(struct usb_function_instance *fi)
76 fi->free_func_inst(fi);
79 EXPORT_SYMBOL_GPL(usb_put_function_instance);
81 void usb_put_function(struct usb_function *f)
88 EXPORT_SYMBOL_GPL(usb_put_function);
90 int usb_function_register(struct usb_function_driver *newf)
92 struct usb_function_driver *fd;
97 mutex_lock(&func_lock);
98 list_for_each_entry(fd, &func_list, list) {
99 if (!strcmp(fd->name, newf->name))
103 list_add_tail(&newf->list, &func_list);
105 mutex_unlock(&func_lock);
108 EXPORT_SYMBOL_GPL(usb_function_register);
110 void usb_function_unregister(struct usb_function_driver *fd)
112 mutex_lock(&func_lock);
114 mutex_unlock(&func_lock);
116 EXPORT_SYMBOL_GPL(usb_function_unregister);