gadget_configfs.h (3014B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __GADGET_CONFIGFS__ 3#define __GADGET_CONFIGFS__ 4 5#include <linux/configfs.h> 6 7int check_user_usb_string(const char *name, 8 struct usb_gadget_strings *stringtab_dev); 9 10#define GS_STRINGS_W(__struct, __name) \ 11static 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) \ 24static 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) \ 36static struct configfs_item_operations struct_in##_langid_item_ops = { \ 37 .release = struct_in##_attr_release, \ 38}; \ 39 \ 40static 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; \ 80err: \ 81 kfree(new); \ 82 return ERR_PTR(ret); \ 83} \ 84 \ 85static void struct_in##_strings_drop( \ 86 struct config_group *group, \ 87 struct config_item *item) \ 88{ \ 89 config_item_put(item); \ 90} \ 91 \ 92static struct configfs_group_operations struct_in##_strings_ops = { \ 93 .make_group = &struct_in##_strings_make, \ 94 .drop_item = &struct_in##_strings_drop, \ 95}; \ 96 \ 97static 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