1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __GADGET_CONFIGFS__
3 #define __GADGET_CONFIGFS__
4
5 #include <linux/configfs.h>
6
7 int check_user_usb_string(const char *name,
8 struct usb_gadget_strings *stringtab_dev);
9
10 #define GS_STRINGS_W(__struct, __name) \
11 static ssize_t __struct##_##__name##_store(struct config_item *item, \
12 const char *page, size_t len) \
13 { \
14 struct __struct *gs = to_##__struct(item); \
15 int ret; \
16 \
17 ret = usb_string_copy(page, &gs->__name); \
18 if (ret) \
19 return ret; \
20 return len; \
21 }
22
23 #define GS_STRINGS_R(__struct, __name) \
24 static ssize_t __struct##_##__name##_show(struct config_item *item, char *page) \
25 { \
26 struct __struct *gs = to_##__struct(item); \
27 return sprintf(page, "%s\n", gs->__name ?: ""); \
28 }
29
30 #define GS_STRINGS_RW(struct_name, _name) \
31 GS_STRINGS_R(struct_name, _name) \
32 GS_STRINGS_W(struct_name, _name) \
33 CONFIGFS_ATTR(struct_name##_, _name)
34
35 #define USB_CONFIG_STRING_RW_OPS(struct_in) \
36 static struct configfs_item_operations struct_in##_langid_item_ops = { \
37 .release = struct_in##_attr_release, \
38 }; \
39 \
40 static struct config_item_type struct_in##_langid_type = { \
41 .ct_item_ops = &struct_in##_langid_item_ops, \
42 .ct_attrs = struct_in##_langid_attrs, \
43 .ct_owner = THIS_MODULE, \
44 }
45
46 #define USB_CONFIG_STRINGS_LANG(struct_in, struct_member) \
47 static struct config_group *struct_in##_strings_make( \
48 struct config_group *group, \
49 const char *name) \
50 { \
51 struct struct_member *gi; \
52 struct struct_in *gs; \
53 struct struct_in *new; \
54 int langs = 0; \
55 int ret; \
56 \
57 new = kzalloc(sizeof(*new), GFP_KERNEL); \
58 if (!new) \
59 return ERR_PTR(-ENOMEM); \
60 \
61 ret = check_user_usb_string(name, &new->stringtab_dev); \
62 if (ret) \
63 goto err; \
64 config_group_init_type_name(&new->group, name, \
65 &struct_in##_langid_type); \
66 \
67 gi = container_of(group, struct struct_member, strings_group); \
68 ret = -EEXIST; \
69 list_for_each_entry(gs, &gi->string_list, list) { \
70 if (gs->stringtab_dev.language == new->stringtab_dev.language) \
71 goto err; \
72 langs++; \
73 } \
74 ret = -EOVERFLOW; \
75 if (langs >= MAX_USB_STRING_LANGS) \
76 goto err; \
77 \
78 list_add_tail(&new->list, &gi->string_list); \
79 return &new->group; \
80 err: \
81 kfree(new); \
82 return ERR_PTR(ret); \
83 } \
84 \
85 static void struct_in##_strings_drop( \
86 struct config_group *group, \
87 struct config_item *item) \
88 { \
89 config_item_put(item); \
90 } \
91 \
92 static struct configfs_group_operations struct_in##_strings_ops = { \
93 .make_group = &struct_in##_strings_make, \
94 .drop_item = &struct_in##_strings_drop, \
95 }; \
96 \
97 static struct config_item_type struct_in##_strings_type = { \
98 .ct_group_ops = &struct_in##_strings_ops, \
99 .ct_owner = THIS_MODULE, \
100 }
101
102 #endif