Viewing file:  gadget_configfs.h (2.94 KB) -rw-r--r--
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/* SPDX-License-Identifier: GPL-2.0 */
#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
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