include/linux/usb/gadget_configfs.h

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