File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/include/linux/usb/gadget_configfs.h b/include/linux/usb/gadget_configfs.h
new file mode 100644
index 0000000..c36e957
--- /dev/null
+++ b/include/linux/usb/gadget_configfs.h
@@ -0,0 +1,101 @@
+#ifndef __GADGET_CONFIGFS__
+#define __GADGET_CONFIGFS__
+
+#include <linux/configfs.h>
+
+int check_user_usb_string(const char *name,
+ struct usb_gadget_strings *stringtab_dev);
+
+#define GS_STRINGS_W(__struct, __name) \
+static ssize_t __struct##_##__name##_store(struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct __struct *gs = to_##__struct(item); \
+ int ret; \
+ \
+ ret = usb_string_copy(page, &gs->__name); \
+ if (ret) \
+ return ret; \
+ return len; \
+}
+
+#define GS_STRINGS_R(__struct, __name) \
+static ssize_t __struct##_##__name##_show(struct config_item *item, char *page) \
+{ \
+ struct __struct *gs = to_##__struct(item); \
+ return sprintf(page, "%s\n", gs->__name ?: ""); \
+}
+
+#define GS_STRINGS_RW(struct_name, _name) \
+ GS_STRINGS_R(struct_name, _name) \
+ GS_STRINGS_W(struct_name, _name) \
+ CONFIGFS_ATTR(struct_name##_, _name)
+
+#define USB_CONFIG_STRING_RW_OPS(struct_in) \
+static struct configfs_item_operations struct_in##_langid_item_ops = { \
+ .release = struct_in##_attr_release, \
+}; \
+ \
+static struct config_item_type struct_in##_langid_type = { \
+ .ct_item_ops = &struct_in##_langid_item_ops, \
+ .ct_attrs = struct_in##_langid_attrs, \
+ .ct_owner = THIS_MODULE, \
+}
+
+#define USB_CONFIG_STRINGS_LANG(struct_in, struct_member) \
+ static struct config_group *struct_in##_strings_make( \
+ struct config_group *group, \
+ const char *name) \
+ { \
+ struct struct_member *gi; \
+ struct struct_in *gs; \
+ struct struct_in *new; \
+ int langs = 0; \
+ int ret; \
+ \
+ new = kzalloc(sizeof(*new), GFP_KERNEL); \
+ if (!new) \
+ return ERR_PTR(-ENOMEM); \
+ \
+ ret = check_user_usb_string(name, &new->stringtab_dev); \
+ if (ret) \
+ goto err; \
+ config_group_init_type_name(&new->group, name, \
+ &struct_in##_langid_type); \
+ \
+ gi = container_of(group, struct struct_member, strings_group); \
+ ret = -EEXIST; \
+ list_for_each_entry(gs, &gi->string_list, list) { \
+ if (gs->stringtab_dev.language == new->stringtab_dev.language) \
+ goto err; \
+ langs++; \
+ } \
+ ret = -EOVERFLOW; \
+ if (langs >= MAX_USB_STRING_LANGS) \
+ goto err; \
+ \
+ list_add_tail(&new->list, &gi->string_list); \
+ return &new->group; \
+err: \
+ kfree(new); \
+ return ERR_PTR(ret); \
+} \
+ \
+static void struct_in##_strings_drop( \
+ struct config_group *group, \
+ struct config_item *item) \
+{ \
+ config_item_put(item); \
+} \
+ \
+static struct configfs_group_operations struct_in##_strings_ops = { \
+ .make_group = &struct_in##_strings_make, \
+ .drop_item = &struct_in##_strings_drop, \
+}; \
+ \
+static struct config_item_type struct_in##_strings_type = { \
+ .ct_group_ops = &struct_in##_strings_ops, \
+ .ct_owner = THIS_MODULE, \
+}
+
+#endif