1#ifndef __GADGET_CONFIGFS__
2#define __GADGET_CONFIGFS__
3
4#include <linux/configfs.h>
5
6int check_user_usb_string(const char *name,
7		struct usb_gadget_strings *stringtab_dev);
8
9#define GS_STRINGS_W(__struct, __name)	\
10	static ssize_t __struct##_##__name##_store(struct __struct *gs, \
11		const char *page, size_t len)		\
12{							\
13	int ret;					\
14							\
15	ret = usb_string_copy(page, &gs->__name);	\
16	if (ret)					\
17		return ret;				\
18	return len;					\
19}
20
21#define GS_STRINGS_R(__struct, __name)	\
22	static ssize_t __struct##_##__name##_show(struct __struct *gs, \
23			char *page)	\
24{	\
25	return sprintf(page, "%s\n", gs->__name ?: "");	\
26}
27
28#define GS_STRING_ITEM_ATTR(struct_name, name)	\
29	static struct struct_name##_attribute struct_name##_##name = \
30		__CONFIGFS_ATTR(name,  S_IRUGO | S_IWUSR,		\
31				struct_name##_##name##_show,		\
32				struct_name##_##name##_store)
33
34#define GS_STRINGS_RW(struct_name, _name)	\
35	GS_STRINGS_R(struct_name, _name)	\
36	GS_STRINGS_W(struct_name, _name)	\
37	GS_STRING_ITEM_ATTR(struct_name, _name)
38
39#define USB_CONFIG_STRING_RW_OPS(struct_in)				\
40	CONFIGFS_ATTR_OPS(struct_in);					\
41									\
42static struct configfs_item_operations struct_in##_langid_item_ops = {	\
43	.release                = struct_in##_attr_release,		\
44	.show_attribute         = struct_in##_attr_show,		\
45	.store_attribute        = struct_in##_attr_store,		\
46};									\
47									\
48static struct config_item_type struct_in##_langid_type = {		\
49	.ct_item_ops	= &struct_in##_langid_item_ops,			\
50	.ct_attrs	= struct_in##_langid_attrs,			\
51	.ct_owner	= THIS_MODULE,					\
52}
53
54#define USB_CONFIG_STRINGS_LANG(struct_in, struct_member)	\
55	static struct config_group *struct_in##_strings_make(		\
56			struct config_group *group,			\
57			const char *name)				\
58	{								\
59	struct struct_member *gi;					\
60	struct struct_in *gs;						\
61	struct struct_in *new;						\
62	int langs = 0;							\
63	int ret;							\
64									\
65	new = kzalloc(sizeof(*new), GFP_KERNEL);			\
66	if (!new)							\
67		return ERR_PTR(-ENOMEM);				\
68									\
69	ret = check_user_usb_string(name, &new->stringtab_dev);		\
70	if (ret)							\
71		goto err;						\
72	config_group_init_type_name(&new->group, name,			\
73			&struct_in##_langid_type);			\
74									\
75	gi = container_of(group, struct struct_member, strings_group);	\
76	ret = -EEXIST;							\
77	list_for_each_entry(gs, &gi->string_list, list) {		\
78		if (gs->stringtab_dev.language == new->stringtab_dev.language) \
79			goto err;					\
80		langs++;						\
81	}								\
82	ret = -EOVERFLOW;						\
83	if (langs >= MAX_USB_STRING_LANGS)				\
84		goto err;						\
85									\
86	list_add_tail(&new->list, &gi->string_list);			\
87	return &new->group;						\
88err:									\
89	kfree(new);							\
90	return ERR_PTR(ret);						\
91}									\
92									\
93static void struct_in##_strings_drop(					\
94		struct config_group *group,				\
95		struct config_item *item)				\
96{									\
97	config_item_put(item);						\
98}									\
99									\
100static struct configfs_group_operations struct_in##_strings_ops = {	\
101	.make_group     = &struct_in##_strings_make,			\
102	.drop_item      = &struct_in##_strings_drop,			\
103};									\
104									\
105static struct config_item_type struct_in##_strings_type = {		\
106	.ct_group_ops   = &struct_in##_strings_ops,			\
107	.ct_owner       = THIS_MODULE,					\
108}
109
110#endif
111