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