1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
6 #include <linux/usb/composite.h>
7 #include <linux/usb/gadget_configfs.h>
10 #include "u_os_desc.h"
12 int check_user_usb_string(const char *name
,
13 struct usb_gadget_strings
*stringtab_dev
)
15 unsigned primary_lang
;
20 ret
= kstrtou16(name
, 0, &num
);
24 primary_lang
= num
& 0x3ff;
27 /* simple sanity check for valid langid */
28 switch (primary_lang
) {
37 stringtab_dev
->language
= num
;
41 #define MAX_NAME_LEN 40
42 #define MAX_USB_STRING_LANGS 2
45 struct config_group group
;
46 struct config_group functions_group
;
47 struct config_group configs_group
;
48 struct config_group strings_group
;
49 struct config_group os_desc_group
;
50 struct config_group
*default_groups
[5];
53 struct usb_gadget_strings
*gstrings
[MAX_USB_STRING_LANGS
+ 1];
54 struct list_head string_list
;
55 struct list_head available_func
;
59 struct usb_otg_descriptor otg
;
61 struct usb_composite_driver composite
;
62 struct usb_composite_dev cdev
;
65 char qw_sign
[OS_STRING_QW_SIGN_LEN
];
68 struct config_usb_cfg
{
69 struct config_group group
;
70 struct config_group strings_group
;
71 struct config_group
*default_groups
[2];
72 struct list_head string_list
;
73 struct usb_configuration c
;
74 struct list_head func_list
;
75 struct usb_gadget_strings
*gstrings
[MAX_USB_STRING_LANGS
+ 1];
78 struct gadget_strings
{
79 struct usb_gadget_strings stringtab_dev
;
80 struct usb_string strings
[USB_GADGET_FIRST_AVAIL_IDX
];
85 struct config_group group
;
86 struct list_head list
;
90 struct config_group group
;
93 struct gadget_config_name
{
94 struct usb_gadget_strings stringtab_dev
;
95 struct usb_string strings
;
98 struct config_group group
;
99 struct list_head list
;
102 static int usb_string_copy(const char *s
, char **s_copy
)
106 char *copy
= *s_copy
;
111 str
= kstrdup(s
, GFP_KERNEL
);
114 if (str
[ret
- 1] == '\n')
121 CONFIGFS_ATTR_STRUCT(gadget_info
);
122 CONFIGFS_ATTR_STRUCT(config_usb_cfg
);
124 #define GI_DEVICE_DESC_ITEM_ATTR(name) \
125 static struct gadget_info_attribute gadget_cdev_desc_##name = \
126 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
127 gadget_dev_desc_##name##_show, \
128 gadget_dev_desc_##name##_store)
130 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
131 static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
134 return sprintf(page, "0x%02x\n", gi->cdev.desc.__name); \
137 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
138 static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
141 return sprintf(page, "0x%04x\n", le16_to_cpup(&gi->cdev.desc.__name)); \
145 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
146 static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
147 const char *page, size_t len) \
151 ret = kstrtou8(page, 0, &val); \
154 gi->cdev.desc._name = val; \
158 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
159 static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
160 const char *page, size_t len) \
164 ret = kstrtou16(page, 0, &val); \
167 gi->cdev.desc._name = cpu_to_le16p(&val); \
171 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
175 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB
);
176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass
, u8
);
177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass
, u8
);
178 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol
, u8
);
179 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0
, u8
);
180 GI_DEVICE_DESC_SIMPLE_RW(idVendor
, u16
);
181 GI_DEVICE_DESC_SIMPLE_RW(idProduct
, u16
);
182 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice
);
184 static ssize_t
is_valid_bcd(u16 bcd_val
)
186 if ((bcd_val
& 0xf) > 9)
188 if (((bcd_val
>> 4) & 0xf) > 9)
190 if (((bcd_val
>> 8) & 0xf) > 9)
192 if (((bcd_val
>> 12) & 0xf) > 9)
197 static ssize_t
gadget_dev_desc_bcdDevice_store(struct gadget_info
*gi
,
198 const char *page
, size_t len
)
203 ret
= kstrtou16(page
, 0, &bcdDevice
);
206 ret
= is_valid_bcd(bcdDevice
);
210 gi
->cdev
.desc
.bcdDevice
= cpu_to_le16(bcdDevice
);
214 static ssize_t
gadget_dev_desc_bcdUSB_store(struct gadget_info
*gi
,
215 const char *page
, size_t len
)
220 ret
= kstrtou16(page
, 0, &bcdUSB
);
223 ret
= is_valid_bcd(bcdUSB
);
227 gi
->cdev
.desc
.bcdUSB
= cpu_to_le16(bcdUSB
);
231 static ssize_t
gadget_dev_desc_UDC_show(struct gadget_info
*gi
, char *page
)
233 return sprintf(page
, "%s\n", gi
->udc_name
?: "");
236 static int unregister_gadget(struct gadget_info
*gi
)
243 ret
= usb_gadget_unregister_driver(&gi
->composite
.gadget_driver
);
251 static ssize_t
gadget_dev_desc_UDC_store(struct gadget_info
*gi
,
252 const char *page
, size_t len
)
257 name
= kstrdup(page
, GFP_KERNEL
);
260 if (name
[len
- 1] == '\n')
261 name
[len
- 1] = '\0';
263 mutex_lock(&gi
->lock
);
266 ret
= unregister_gadget(gi
);
274 ret
= udc_attach_driver(name
, &gi
->composite
.gadget_driver
);
279 mutex_unlock(&gi
->lock
);
283 mutex_unlock(&gi
->lock
);
287 GI_DEVICE_DESC_ITEM_ATTR(bDeviceClass
);
288 GI_DEVICE_DESC_ITEM_ATTR(bDeviceSubClass
);
289 GI_DEVICE_DESC_ITEM_ATTR(bDeviceProtocol
);
290 GI_DEVICE_DESC_ITEM_ATTR(bMaxPacketSize0
);
291 GI_DEVICE_DESC_ITEM_ATTR(idVendor
);
292 GI_DEVICE_DESC_ITEM_ATTR(idProduct
);
293 GI_DEVICE_DESC_ITEM_ATTR(bcdDevice
);
294 GI_DEVICE_DESC_ITEM_ATTR(bcdUSB
);
295 GI_DEVICE_DESC_ITEM_ATTR(UDC
);
297 static struct configfs_attribute
*gadget_root_attrs
[] = {
298 &gadget_cdev_desc_bDeviceClass
.attr
,
299 &gadget_cdev_desc_bDeviceSubClass
.attr
,
300 &gadget_cdev_desc_bDeviceProtocol
.attr
,
301 &gadget_cdev_desc_bMaxPacketSize0
.attr
,
302 &gadget_cdev_desc_idVendor
.attr
,
303 &gadget_cdev_desc_idProduct
.attr
,
304 &gadget_cdev_desc_bcdDevice
.attr
,
305 &gadget_cdev_desc_bcdUSB
.attr
,
306 &gadget_cdev_desc_UDC
.attr
,
310 static inline struct gadget_info
*to_gadget_info(struct config_item
*item
)
312 return container_of(to_config_group(item
), struct gadget_info
, group
);
315 static inline struct gadget_strings
*to_gadget_strings(struct config_item
*item
)
317 return container_of(to_config_group(item
), struct gadget_strings
,
321 static inline struct gadget_config_name
*to_gadget_config_name(
322 struct config_item
*item
)
324 return container_of(to_config_group(item
), struct gadget_config_name
,
328 static inline struct config_usb_cfg
*to_config_usb_cfg(struct config_item
*item
)
330 return container_of(to_config_group(item
), struct config_usb_cfg
,
334 static inline struct usb_function_instance
*to_usb_function_instance(
335 struct config_item
*item
)
337 return container_of(to_config_group(item
),
338 struct usb_function_instance
, group
);
341 static void gadget_info_attr_release(struct config_item
*item
)
343 struct gadget_info
*gi
= to_gadget_info(item
);
345 WARN_ON(!list_empty(&gi
->cdev
.configs
));
346 WARN_ON(!list_empty(&gi
->string_list
));
347 WARN_ON(!list_empty(&gi
->available_func
));
348 kfree(gi
->composite
.gadget_driver
.function
);
352 CONFIGFS_ATTR_OPS(gadget_info
);
354 static struct configfs_item_operations gadget_root_item_ops
= {
355 .release
= gadget_info_attr_release
,
356 .show_attribute
= gadget_info_attr_show
,
357 .store_attribute
= gadget_info_attr_store
,
360 static void gadget_config_attr_release(struct config_item
*item
)
362 struct config_usb_cfg
*cfg
= to_config_usb_cfg(item
);
364 WARN_ON(!list_empty(&cfg
->c
.functions
));
365 list_del(&cfg
->c
.list
);
370 static int config_usb_cfg_link(
371 struct config_item
*usb_cfg_ci
,
372 struct config_item
*usb_func_ci
)
374 struct config_usb_cfg
*cfg
= to_config_usb_cfg(usb_cfg_ci
);
375 struct usb_composite_dev
*cdev
= cfg
->c
.cdev
;
376 struct gadget_info
*gi
= container_of(cdev
, struct gadget_info
, cdev
);
378 struct config_group
*group
= to_config_group(usb_func_ci
);
379 struct usb_function_instance
*fi
= container_of(group
,
380 struct usb_function_instance
, group
);
381 struct usb_function_instance
*a_fi
;
382 struct usb_function
*f
;
385 mutex_lock(&gi
->lock
);
387 * Make sure this function is from within our _this_ gadget and not
388 * from another gadget or a random directory.
389 * Also a function instance can only be linked once.
391 list_for_each_entry(a_fi
, &gi
->available_func
, cfs_list
) {
400 list_for_each_entry(f
, &cfg
->func_list
, list
) {
407 f
= usb_get_function(fi
);
413 /* stash the function until we bind it to the gadget */
414 list_add_tail(&f
->list
, &cfg
->func_list
);
417 mutex_unlock(&gi
->lock
);
421 static int config_usb_cfg_unlink(
422 struct config_item
*usb_cfg_ci
,
423 struct config_item
*usb_func_ci
)
425 struct config_usb_cfg
*cfg
= to_config_usb_cfg(usb_cfg_ci
);
426 struct usb_composite_dev
*cdev
= cfg
->c
.cdev
;
427 struct gadget_info
*gi
= container_of(cdev
, struct gadget_info
, cdev
);
429 struct config_group
*group
= to_config_group(usb_func_ci
);
430 struct usb_function_instance
*fi
= container_of(group
,
431 struct usb_function_instance
, group
);
432 struct usb_function
*f
;
435 * ideally I would like to forbid to unlink functions while a gadget is
436 * bound to an UDC. Since this isn't possible at the moment, we simply
437 * force an unbind, the function is available here and then we can
438 * remove the function.
440 mutex_lock(&gi
->lock
);
442 unregister_gadget(gi
);
443 WARN_ON(gi
->udc_name
);
445 list_for_each_entry(f
, &cfg
->func_list
, list
) {
449 mutex_unlock(&gi
->lock
);
453 mutex_unlock(&gi
->lock
);
454 WARN(1, "Unable to locate function to unbind\n");
458 CONFIGFS_ATTR_OPS(config_usb_cfg
);
460 static struct configfs_item_operations gadget_config_item_ops
= {
461 .release
= gadget_config_attr_release
,
462 .show_attribute
= config_usb_cfg_attr_show
,
463 .store_attribute
= config_usb_cfg_attr_store
,
464 .allow_link
= config_usb_cfg_link
,
465 .drop_link
= config_usb_cfg_unlink
,
469 static ssize_t
gadget_config_desc_MaxPower_show(struct config_usb_cfg
*cfg
,
472 return sprintf(page
, "%u\n", cfg
->c
.MaxPower
);
475 static ssize_t
gadget_config_desc_MaxPower_store(struct config_usb_cfg
*cfg
,
476 const char *page
, size_t len
)
480 ret
= kstrtou16(page
, 0, &val
);
483 if (DIV_ROUND_UP(val
, 8) > 0xff)
485 cfg
->c
.MaxPower
= val
;
489 static ssize_t
gadget_config_desc_bmAttributes_show(struct config_usb_cfg
*cfg
,
492 return sprintf(page
, "0x%02x\n", cfg
->c
.bmAttributes
);
495 static ssize_t
gadget_config_desc_bmAttributes_store(struct config_usb_cfg
*cfg
,
496 const char *page
, size_t len
)
500 ret
= kstrtou8(page
, 0, &val
);
503 if (!(val
& USB_CONFIG_ATT_ONE
))
505 if (val
& ~(USB_CONFIG_ATT_ONE
| USB_CONFIG_ATT_SELFPOWER
|
506 USB_CONFIG_ATT_WAKEUP
))
508 cfg
->c
.bmAttributes
= val
;
512 #define CFG_CONFIG_DESC_ITEM_ATTR(name) \
513 static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \
514 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
515 gadget_config_desc_##name##_show, \
516 gadget_config_desc_##name##_store)
518 CFG_CONFIG_DESC_ITEM_ATTR(MaxPower
);
519 CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes
);
521 static struct configfs_attribute
*gadget_config_attrs
[] = {
522 &gadget_usb_cfg_MaxPower
.attr
,
523 &gadget_usb_cfg_bmAttributes
.attr
,
527 static struct config_item_type gadget_config_type
= {
528 .ct_item_ops
= &gadget_config_item_ops
,
529 .ct_attrs
= gadget_config_attrs
,
530 .ct_owner
= THIS_MODULE
,
533 static struct config_item_type gadget_root_type
= {
534 .ct_item_ops
= &gadget_root_item_ops
,
535 .ct_attrs
= gadget_root_attrs
,
536 .ct_owner
= THIS_MODULE
,
539 static void composite_init_dev(struct usb_composite_dev
*cdev
)
541 spin_lock_init(&cdev
->lock
);
542 INIT_LIST_HEAD(&cdev
->configs
);
543 INIT_LIST_HEAD(&cdev
->gstrings
);
546 static struct config_group
*function_make(
547 struct config_group
*group
,
550 struct gadget_info
*gi
;
551 struct usb_function_instance
*fi
;
552 char buf
[MAX_NAME_LEN
];
557 ret
= snprintf(buf
, MAX_NAME_LEN
, "%s", name
);
558 if (ret
>= MAX_NAME_LEN
)
559 return ERR_PTR(-ENAMETOOLONG
);
562 instance_name
= strchr(func_name
, '.');
563 if (!instance_name
) {
564 pr_err("Unable to locate . in FUNC.INSTANCE\n");
565 return ERR_PTR(-EINVAL
);
567 *instance_name
= '\0';
570 fi
= usb_get_function_instance(func_name
);
574 ret
= config_item_set_name(&fi
->group
.cg_item
, name
);
576 usb_put_function_instance(fi
);
579 if (fi
->set_inst_name
) {
580 ret
= fi
->set_inst_name(fi
, instance_name
);
582 usb_put_function_instance(fi
);
587 gi
= container_of(group
, struct gadget_info
, functions_group
);
589 mutex_lock(&gi
->lock
);
590 list_add_tail(&fi
->cfs_list
, &gi
->available_func
);
591 mutex_unlock(&gi
->lock
);
595 static void function_drop(
596 struct config_group
*group
,
597 struct config_item
*item
)
599 struct usb_function_instance
*fi
= to_usb_function_instance(item
);
600 struct gadget_info
*gi
;
602 gi
= container_of(group
, struct gadget_info
, functions_group
);
604 mutex_lock(&gi
->lock
);
605 list_del(&fi
->cfs_list
);
606 mutex_unlock(&gi
->lock
);
607 config_item_put(item
);
610 static struct configfs_group_operations functions_ops
= {
611 .make_group
= &function_make
,
612 .drop_item
= &function_drop
,
615 static struct config_item_type functions_type
= {
616 .ct_group_ops
= &functions_ops
,
617 .ct_owner
= THIS_MODULE
,
620 CONFIGFS_ATTR_STRUCT(gadget_config_name
);
621 GS_STRINGS_RW(gadget_config_name
, configuration
);
623 static struct configfs_attribute
*gadget_config_name_langid_attrs
[] = {
624 &gadget_config_name_configuration
.attr
,
628 static void gadget_config_name_attr_release(struct config_item
*item
)
630 struct gadget_config_name
*cn
= to_gadget_config_name(item
);
632 kfree(cn
->configuration
);
638 USB_CONFIG_STRING_RW_OPS(gadget_config_name
);
639 USB_CONFIG_STRINGS_LANG(gadget_config_name
, config_usb_cfg
);
641 static struct config_group
*config_desc_make(
642 struct config_group
*group
,
645 struct gadget_info
*gi
;
646 struct config_usb_cfg
*cfg
;
647 char buf
[MAX_NAME_LEN
];
652 gi
= container_of(group
, struct gadget_info
, configs_group
);
653 ret
= snprintf(buf
, MAX_NAME_LEN
, "%s", name
);
654 if (ret
>= MAX_NAME_LEN
)
655 return ERR_PTR(-ENAMETOOLONG
);
657 num_str
= strchr(buf
, '.');
659 pr_err("Unable to locate . in name.bConfigurationValue\n");
660 return ERR_PTR(-EINVAL
);
667 return ERR_PTR(-EINVAL
);
669 ret
= kstrtou8(num_str
, 0, &num
);
673 cfg
= kzalloc(sizeof(*cfg
), GFP_KERNEL
);
675 return ERR_PTR(-ENOMEM
);
676 cfg
->c
.label
= kstrdup(buf
, GFP_KERNEL
);
681 cfg
->c
.bConfigurationValue
= num
;
682 cfg
->c
.MaxPower
= CONFIG_USB_GADGET_VBUS_DRAW
;
683 cfg
->c
.bmAttributes
= USB_CONFIG_ATT_ONE
;
684 INIT_LIST_HEAD(&cfg
->string_list
);
685 INIT_LIST_HEAD(&cfg
->func_list
);
687 cfg
->group
.default_groups
= cfg
->default_groups
;
688 cfg
->default_groups
[0] = &cfg
->strings_group
;
690 config_group_init_type_name(&cfg
->group
, name
,
691 &gadget_config_type
);
692 config_group_init_type_name(&cfg
->strings_group
, "strings",
693 &gadget_config_name_strings_type
);
695 ret
= usb_add_config_only(&gi
->cdev
, &cfg
->c
);
706 static void config_desc_drop(
707 struct config_group
*group
,
708 struct config_item
*item
)
710 config_item_put(item
);
713 static struct configfs_group_operations config_desc_ops
= {
714 .make_group
= &config_desc_make
,
715 .drop_item
= &config_desc_drop
,
718 static struct config_item_type config_desc_type
= {
719 .ct_group_ops
= &config_desc_ops
,
720 .ct_owner
= THIS_MODULE
,
723 CONFIGFS_ATTR_STRUCT(gadget_strings
);
724 GS_STRINGS_RW(gadget_strings
, manufacturer
);
725 GS_STRINGS_RW(gadget_strings
, product
);
726 GS_STRINGS_RW(gadget_strings
, serialnumber
);
728 static struct configfs_attribute
*gadget_strings_langid_attrs
[] = {
729 &gadget_strings_manufacturer
.attr
,
730 &gadget_strings_product
.attr
,
731 &gadget_strings_serialnumber
.attr
,
735 static void gadget_strings_attr_release(struct config_item
*item
)
737 struct gadget_strings
*gs
= to_gadget_strings(item
);
739 kfree(gs
->manufacturer
);
741 kfree(gs
->serialnumber
);
747 USB_CONFIG_STRING_RW_OPS(gadget_strings
);
748 USB_CONFIG_STRINGS_LANG(gadget_strings
, gadget_info
);
750 static inline struct os_desc
*to_os_desc(struct config_item
*item
)
752 return container_of(to_config_group(item
), struct os_desc
, group
);
755 CONFIGFS_ATTR_STRUCT(os_desc
);
756 CONFIGFS_ATTR_OPS(os_desc
);
758 static ssize_t
os_desc_use_show(struct os_desc
*os_desc
, char *page
)
760 struct gadget_info
*gi
;
762 gi
= to_gadget_info(os_desc
->group
.cg_item
.ci_parent
);
764 return sprintf(page
, "%d", gi
->use_os_desc
);
767 static ssize_t
os_desc_use_store(struct os_desc
*os_desc
, const char *page
,
770 struct gadget_info
*gi
;
774 gi
= to_gadget_info(os_desc
->group
.cg_item
.ci_parent
);
776 mutex_lock(&gi
->lock
);
777 ret
= strtobool(page
, &use
);
779 gi
->use_os_desc
= use
;
782 mutex_unlock(&gi
->lock
);
787 static struct os_desc_attribute os_desc_use
=
788 __CONFIGFS_ATTR(use
, S_IRUGO
| S_IWUSR
,
792 static ssize_t
os_desc_b_vendor_code_show(struct os_desc
*os_desc
, char *page
)
794 struct gadget_info
*gi
;
796 gi
= to_gadget_info(os_desc
->group
.cg_item
.ci_parent
);
798 return sprintf(page
, "%d", gi
->b_vendor_code
);
801 static ssize_t
os_desc_b_vendor_code_store(struct os_desc
*os_desc
,
802 const char *page
, size_t len
)
804 struct gadget_info
*gi
;
808 gi
= to_gadget_info(os_desc
->group
.cg_item
.ci_parent
);
810 mutex_lock(&gi
->lock
);
811 ret
= kstrtou8(page
, 0, &b_vendor_code
);
813 gi
->b_vendor_code
= b_vendor_code
;
816 mutex_unlock(&gi
->lock
);
821 static struct os_desc_attribute os_desc_b_vendor_code
=
822 __CONFIGFS_ATTR(b_vendor_code
, S_IRUGO
| S_IWUSR
,
823 os_desc_b_vendor_code_show
,
824 os_desc_b_vendor_code_store
);
826 static ssize_t
os_desc_qw_sign_show(struct os_desc
*os_desc
, char *page
)
828 struct gadget_info
*gi
;
830 gi
= to_gadget_info(os_desc
->group
.cg_item
.ci_parent
);
832 memcpy(page
, gi
->qw_sign
, OS_STRING_QW_SIGN_LEN
);
834 return OS_STRING_QW_SIGN_LEN
;
837 static ssize_t
os_desc_qw_sign_store(struct os_desc
*os_desc
, const char *page
,
840 struct gadget_info
*gi
;
843 gi
= to_gadget_info(os_desc
->group
.cg_item
.ci_parent
);
844 l
= min((int)len
, OS_STRING_QW_SIGN_LEN
>> 1);
845 if (page
[l
- 1] == '\n')
848 mutex_lock(&gi
->lock
);
849 res
= utf8s_to_utf16s(page
, l
,
850 UTF16_LITTLE_ENDIAN
, (wchar_t *) gi
->qw_sign
,
851 OS_STRING_QW_SIGN_LEN
);
854 mutex_unlock(&gi
->lock
);
859 static struct os_desc_attribute os_desc_qw_sign
=
860 __CONFIGFS_ATTR(qw_sign
, S_IRUGO
| S_IWUSR
,
861 os_desc_qw_sign_show
,
862 os_desc_qw_sign_store
);
864 static struct configfs_attribute
*os_desc_attrs
[] = {
866 &os_desc_b_vendor_code
.attr
,
867 &os_desc_qw_sign
.attr
,
871 static void os_desc_attr_release(struct config_item
*item
)
873 struct os_desc
*os_desc
= to_os_desc(item
);
877 static int os_desc_link(struct config_item
*os_desc_ci
,
878 struct config_item
*usb_cfg_ci
)
880 struct gadget_info
*gi
= container_of(to_config_group(os_desc_ci
),
881 struct gadget_info
, os_desc_group
);
882 struct usb_composite_dev
*cdev
= &gi
->cdev
;
883 struct config_usb_cfg
*c_target
=
884 container_of(to_config_group(usb_cfg_ci
),
885 struct config_usb_cfg
, group
);
886 struct usb_configuration
*c
;
889 mutex_lock(&gi
->lock
);
890 list_for_each_entry(c
, &cdev
->configs
, list
) {
891 if (c
== &c_target
->c
)
894 if (c
!= &c_target
->c
) {
899 if (cdev
->os_desc_config
) {
904 cdev
->os_desc_config
= &c_target
->c
;
908 mutex_unlock(&gi
->lock
);
912 static int os_desc_unlink(struct config_item
*os_desc_ci
,
913 struct config_item
*usb_cfg_ci
)
915 struct gadget_info
*gi
= container_of(to_config_group(os_desc_ci
),
916 struct gadget_info
, os_desc_group
);
917 struct usb_composite_dev
*cdev
= &gi
->cdev
;
919 mutex_lock(&gi
->lock
);
921 unregister_gadget(gi
);
922 cdev
->os_desc_config
= NULL
;
923 WARN_ON(gi
->udc_name
);
924 mutex_unlock(&gi
->lock
);
928 static struct configfs_item_operations os_desc_ops
= {
929 .release
= os_desc_attr_release
,
930 .show_attribute
= os_desc_attr_show
,
931 .store_attribute
= os_desc_attr_store
,
932 .allow_link
= os_desc_link
,
933 .drop_link
= os_desc_unlink
,
936 static struct config_item_type os_desc_type
= {
937 .ct_item_ops
= &os_desc_ops
,
938 .ct_attrs
= os_desc_attrs
,
939 .ct_owner
= THIS_MODULE
,
942 CONFIGFS_ATTR_STRUCT(usb_os_desc
);
943 CONFIGFS_ATTR_OPS(usb_os_desc
);
946 static inline struct usb_os_desc_ext_prop
947 *to_usb_os_desc_ext_prop(struct config_item
*item
)
949 return container_of(item
, struct usb_os_desc_ext_prop
, item
);
952 CONFIGFS_ATTR_STRUCT(usb_os_desc_ext_prop
);
953 CONFIGFS_ATTR_OPS(usb_os_desc_ext_prop
);
955 static ssize_t
ext_prop_type_show(struct usb_os_desc_ext_prop
*ext_prop
,
958 return sprintf(page
, "%d", ext_prop
->type
);
961 static ssize_t
ext_prop_type_store(struct usb_os_desc_ext_prop
*ext_prop
,
962 const char *page
, size_t len
)
964 struct usb_os_desc
*desc
= to_usb_os_desc(ext_prop
->item
.ci_parent
);
968 if (desc
->opts_mutex
)
969 mutex_lock(desc
->opts_mutex
);
970 ret
= kstrtou8(page
, 0, &type
);
973 if (type
< USB_EXT_PROP_UNICODE
|| type
> USB_EXT_PROP_UNICODE_MULTI
) {
978 if ((ext_prop
->type
== USB_EXT_PROP_BINARY
||
979 ext_prop
->type
== USB_EXT_PROP_LE32
||
980 ext_prop
->type
== USB_EXT_PROP_BE32
) &&
981 (type
== USB_EXT_PROP_UNICODE
||
982 type
== USB_EXT_PROP_UNICODE_ENV
||
983 type
== USB_EXT_PROP_UNICODE_LINK
))
984 ext_prop
->data_len
<<= 1;
985 else if ((ext_prop
->type
== USB_EXT_PROP_UNICODE
||
986 ext_prop
->type
== USB_EXT_PROP_UNICODE_ENV
||
987 ext_prop
->type
== USB_EXT_PROP_UNICODE_LINK
) &&
988 (type
== USB_EXT_PROP_BINARY
||
989 type
== USB_EXT_PROP_LE32
||
990 type
== USB_EXT_PROP_BE32
))
991 ext_prop
->data_len
>>= 1;
992 ext_prop
->type
= type
;
996 if (desc
->opts_mutex
)
997 mutex_unlock(desc
->opts_mutex
);
1001 static ssize_t
ext_prop_data_show(struct usb_os_desc_ext_prop
*ext_prop
,
1004 int len
= ext_prop
->data_len
;
1006 if (ext_prop
->type
== USB_EXT_PROP_UNICODE
||
1007 ext_prop
->type
== USB_EXT_PROP_UNICODE_ENV
||
1008 ext_prop
->type
== USB_EXT_PROP_UNICODE_LINK
)
1010 memcpy(page
, ext_prop
->data
, len
);
1015 static ssize_t
ext_prop_data_store(struct usb_os_desc_ext_prop
*ext_prop
,
1016 const char *page
, size_t len
)
1018 struct usb_os_desc
*desc
= to_usb_os_desc(ext_prop
->item
.ci_parent
);
1020 size_t ret_len
= len
;
1022 if (page
[len
- 1] == '\n' || page
[len
- 1] == '\0')
1024 new_data
= kzalloc(len
, GFP_KERNEL
);
1028 memcpy(new_data
, page
, len
);
1030 if (desc
->opts_mutex
)
1031 mutex_lock(desc
->opts_mutex
);
1032 kfree(ext_prop
->data
);
1033 ext_prop
->data
= new_data
;
1034 desc
->ext_prop_len
-= ext_prop
->data_len
;
1035 ext_prop
->data_len
= len
;
1036 desc
->ext_prop_len
+= ext_prop
->data_len
;
1037 if (ext_prop
->type
== USB_EXT_PROP_UNICODE
||
1038 ext_prop
->type
== USB_EXT_PROP_UNICODE_ENV
||
1039 ext_prop
->type
== USB_EXT_PROP_UNICODE_LINK
) {
1040 desc
->ext_prop_len
-= ext_prop
->data_len
;
1041 ext_prop
->data_len
<<= 1;
1042 ext_prop
->data_len
+= 2;
1043 desc
->ext_prop_len
+= ext_prop
->data_len
;
1045 if (desc
->opts_mutex
)
1046 mutex_unlock(desc
->opts_mutex
);
1050 static struct usb_os_desc_ext_prop_attribute ext_prop_type
=
1051 __CONFIGFS_ATTR(type
, S_IRUGO
| S_IWUSR
,
1052 ext_prop_type_show
, ext_prop_type_store
);
1054 static struct usb_os_desc_ext_prop_attribute ext_prop_data
=
1055 __CONFIGFS_ATTR(data
, S_IRUGO
| S_IWUSR
,
1056 ext_prop_data_show
, ext_prop_data_store
);
1058 static struct configfs_attribute
*ext_prop_attrs
[] = {
1059 &ext_prop_type
.attr
,
1060 &ext_prop_data
.attr
,
1064 static void usb_os_desc_ext_prop_release(struct config_item
*item
)
1066 struct usb_os_desc_ext_prop
*ext_prop
= to_usb_os_desc_ext_prop(item
);
1068 kfree(ext_prop
); /* frees a whole chunk */
1071 static struct configfs_item_operations ext_prop_ops
= {
1072 .release
= usb_os_desc_ext_prop_release
,
1073 .show_attribute
= usb_os_desc_ext_prop_attr_show
,
1074 .store_attribute
= usb_os_desc_ext_prop_attr_store
,
1077 static struct config_item
*ext_prop_make(
1078 struct config_group
*group
,
1081 struct usb_os_desc_ext_prop
*ext_prop
;
1082 struct config_item_type
*ext_prop_type
;
1083 struct usb_os_desc
*desc
;
1086 vla_group(data_chunk
);
1087 vla_item(data_chunk
, struct usb_os_desc_ext_prop
, ext_prop
, 1);
1088 vla_item(data_chunk
, struct config_item_type
, ext_prop_type
, 1);
1090 vlabuf
= kzalloc(vla_group_size(data_chunk
), GFP_KERNEL
);
1092 return ERR_PTR(-ENOMEM
);
1094 ext_prop
= vla_ptr(vlabuf
, data_chunk
, ext_prop
);
1095 ext_prop_type
= vla_ptr(vlabuf
, data_chunk
, ext_prop_type
);
1097 desc
= container_of(group
, struct usb_os_desc
, group
);
1098 ext_prop_type
->ct_item_ops
= &ext_prop_ops
;
1099 ext_prop_type
->ct_attrs
= ext_prop_attrs
;
1100 ext_prop_type
->ct_owner
= desc
->owner
;
1102 config_item_init_type_name(&ext_prop
->item
, name
, ext_prop_type
);
1104 ext_prop
->name
= kstrdup(name
, GFP_KERNEL
);
1105 if (!ext_prop
->name
) {
1107 return ERR_PTR(-ENOMEM
);
1109 desc
->ext_prop_len
+= 14;
1110 ext_prop
->name_len
= 2 * strlen(ext_prop
->name
) + 2;
1111 if (desc
->opts_mutex
)
1112 mutex_lock(desc
->opts_mutex
);
1113 desc
->ext_prop_len
+= ext_prop
->name_len
;
1114 list_add_tail(&ext_prop
->entry
, &desc
->ext_prop
);
1115 ++desc
->ext_prop_count
;
1116 if (desc
->opts_mutex
)
1117 mutex_unlock(desc
->opts_mutex
);
1119 return &ext_prop
->item
;
1122 static void ext_prop_drop(struct config_group
*group
, struct config_item
*item
)
1124 struct usb_os_desc_ext_prop
*ext_prop
= to_usb_os_desc_ext_prop(item
);
1125 struct usb_os_desc
*desc
= to_usb_os_desc(&group
->cg_item
);
1127 if (desc
->opts_mutex
)
1128 mutex_lock(desc
->opts_mutex
);
1129 list_del(&ext_prop
->entry
);
1130 --desc
->ext_prop_count
;
1131 kfree(ext_prop
->name
);
1132 desc
->ext_prop_len
-= (ext_prop
->name_len
+ ext_prop
->data_len
+ 14);
1133 if (desc
->opts_mutex
)
1134 mutex_unlock(desc
->opts_mutex
);
1135 config_item_put(item
);
1138 static struct configfs_group_operations interf_grp_ops
= {
1139 .make_item
= &ext_prop_make
,
1140 .drop_item
= &ext_prop_drop
,
1143 static struct configfs_item_operations interf_item_ops
= {
1144 .show_attribute
= usb_os_desc_attr_show
,
1145 .store_attribute
= usb_os_desc_attr_store
,
1148 static ssize_t
rndis_grp_compatible_id_show(struct usb_os_desc
*desc
,
1151 memcpy(page
, desc
->ext_compat_id
, 8);
1155 static ssize_t
rndis_grp_compatible_id_store(struct usb_os_desc
*desc
,
1156 const char *page
, size_t len
)
1160 l
= min_t(int, 8, len
);
1161 if (page
[l
- 1] == '\n')
1163 if (desc
->opts_mutex
)
1164 mutex_lock(desc
->opts_mutex
);
1165 memcpy(desc
->ext_compat_id
, page
, l
);
1166 desc
->ext_compat_id
[l
] = '\0';
1168 if (desc
->opts_mutex
)
1169 mutex_unlock(desc
->opts_mutex
);
1174 static struct usb_os_desc_attribute rndis_grp_attr_compatible_id
=
1175 __CONFIGFS_ATTR(compatible_id
, S_IRUGO
| S_IWUSR
,
1176 rndis_grp_compatible_id_show
,
1177 rndis_grp_compatible_id_store
);
1179 static ssize_t
rndis_grp_sub_compatible_id_show(struct usb_os_desc
*desc
,
1182 memcpy(page
, desc
->ext_compat_id
+ 8, 8);
1186 static ssize_t
rndis_grp_sub_compatible_id_store(struct usb_os_desc
*desc
,
1187 const char *page
, size_t len
)
1191 l
= min_t(int, 8, len
);
1192 if (page
[l
- 1] == '\n')
1194 if (desc
->opts_mutex
)
1195 mutex_lock(desc
->opts_mutex
);
1196 memcpy(desc
->ext_compat_id
+ 8, page
, l
);
1197 desc
->ext_compat_id
[l
+ 8] = '\0';
1199 if (desc
->opts_mutex
)
1200 mutex_unlock(desc
->opts_mutex
);
1205 static struct usb_os_desc_attribute rndis_grp_attr_sub_compatible_id
=
1206 __CONFIGFS_ATTR(sub_compatible_id
, S_IRUGO
| S_IWUSR
,
1207 rndis_grp_sub_compatible_id_show
,
1208 rndis_grp_sub_compatible_id_store
);
1210 static struct configfs_attribute
*interf_grp_attrs
[] = {
1211 &rndis_grp_attr_compatible_id
.attr
,
1212 &rndis_grp_attr_sub_compatible_id
.attr
,
1216 int usb_os_desc_prepare_interf_dir(struct config_group
*parent
,
1218 struct usb_os_desc
**desc
,
1219 struct module
*owner
)
1221 struct config_group
**f_default_groups
, *os_desc_group
,
1223 struct config_item_type
*os_desc_type
, *interface_type
;
1225 vla_group(data_chunk
);
1226 vla_item(data_chunk
, struct config_group
*, f_default_groups
, 2);
1227 vla_item(data_chunk
, struct config_group
, os_desc_group
, 1);
1228 vla_item(data_chunk
, struct config_group
*, interface_groups
,
1230 vla_item(data_chunk
, struct config_item_type
, os_desc_type
, 1);
1231 vla_item(data_chunk
, struct config_item_type
, interface_type
, 1);
1233 char *vlabuf
= kzalloc(vla_group_size(data_chunk
), GFP_KERNEL
);
1237 f_default_groups
= vla_ptr(vlabuf
, data_chunk
, f_default_groups
);
1238 os_desc_group
= vla_ptr(vlabuf
, data_chunk
, os_desc_group
);
1239 os_desc_type
= vla_ptr(vlabuf
, data_chunk
, os_desc_type
);
1240 interface_groups
= vla_ptr(vlabuf
, data_chunk
, interface_groups
);
1241 interface_type
= vla_ptr(vlabuf
, data_chunk
, interface_type
);
1243 parent
->default_groups
= f_default_groups
;
1244 os_desc_type
->ct_owner
= owner
;
1245 config_group_init_type_name(os_desc_group
, "os_desc", os_desc_type
);
1246 f_default_groups
[0] = os_desc_group
;
1248 os_desc_group
->default_groups
= interface_groups
;
1249 interface_type
->ct_item_ops
= &interf_item_ops
;
1250 interface_type
->ct_group_ops
= &interf_grp_ops
;
1251 interface_type
->ct_attrs
= interf_grp_attrs
;
1252 interface_type
->ct_owner
= owner
;
1254 while (n_interf
--) {
1255 struct usb_os_desc
*d
;
1259 config_group_init_type_name(&d
->group
, "", interface_type
);
1260 config_item_set_name(&d
->group
.cg_item
, "interface.%d",
1262 interface_groups
[n_interf
] = &d
->group
;
1267 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir
);
1269 static int configfs_do_nothing(struct usb_composite_dev
*cdev
)
1275 int composite_dev_prepare(struct usb_composite_driver
*composite
,
1276 struct usb_composite_dev
*dev
);
1278 int composite_os_desc_req_prepare(struct usb_composite_dev
*cdev
,
1279 struct usb_ep
*ep0
);
1281 static void purge_configs_funcs(struct gadget_info
*gi
)
1283 struct usb_configuration
*c
;
1285 list_for_each_entry(c
, &gi
->cdev
.configs
, list
) {
1286 struct usb_function
*f
, *tmp
;
1287 struct config_usb_cfg
*cfg
;
1289 cfg
= container_of(c
, struct config_usb_cfg
, c
);
1291 list_for_each_entry_safe(f
, tmp
, &c
->functions
, list
) {
1293 list_move_tail(&f
->list
, &cfg
->func_list
);
1295 dev_err(&gi
->cdev
.gadget
->dev
, "unbind function"
1296 " '%s'/%p\n", f
->name
, f
);
1300 c
->next_interface_id
= 0;
1307 static int configfs_composite_bind(struct usb_gadget
*gadget
,
1308 struct usb_gadget_driver
*gdriver
)
1310 struct usb_composite_driver
*composite
= to_cdriver(gdriver
);
1311 struct gadget_info
*gi
= container_of(composite
,
1312 struct gadget_info
, composite
);
1313 struct usb_composite_dev
*cdev
= &gi
->cdev
;
1314 struct usb_configuration
*c
;
1315 struct usb_string
*s
;
1319 /* the gi->lock is hold by the caller */
1320 cdev
->gadget
= gadget
;
1321 set_gadget_data(gadget
, cdev
);
1322 ret
= composite_dev_prepare(composite
, cdev
);
1325 /* and now the gadget bind */
1328 if (list_empty(&gi
->cdev
.configs
)) {
1329 pr_err("Need at least one configuration in %s.\n",
1330 gi
->composite
.name
);
1331 goto err_comp_cleanup
;
1335 list_for_each_entry(c
, &gi
->cdev
.configs
, list
) {
1336 struct config_usb_cfg
*cfg
;
1338 cfg
= container_of(c
, struct config_usb_cfg
, c
);
1339 if (list_empty(&cfg
->func_list
)) {
1340 pr_err("Config %s/%d of %s needs at least one function.\n",
1341 c
->label
, c
->bConfigurationValue
,
1342 gi
->composite
.name
);
1343 goto err_comp_cleanup
;
1347 /* init all strings */
1348 if (!list_empty(&gi
->string_list
)) {
1349 struct gadget_strings
*gs
;
1352 list_for_each_entry(gs
, &gi
->string_list
, list
) {
1354 gi
->gstrings
[i
] = &gs
->stringtab_dev
;
1355 gs
->stringtab_dev
.strings
= gs
->strings
;
1356 gs
->strings
[USB_GADGET_MANUFACTURER_IDX
].s
=
1358 gs
->strings
[USB_GADGET_PRODUCT_IDX
].s
= gs
->product
;
1359 gs
->strings
[USB_GADGET_SERIAL_IDX
].s
= gs
->serialnumber
;
1362 gi
->gstrings
[i
] = NULL
;
1363 s
= usb_gstrings_attach(&gi
->cdev
, gi
->gstrings
,
1364 USB_GADGET_FIRST_AVAIL_IDX
);
1367 goto err_comp_cleanup
;
1370 gi
->cdev
.desc
.iManufacturer
= s
[USB_GADGET_MANUFACTURER_IDX
].id
;
1371 gi
->cdev
.desc
.iProduct
= s
[USB_GADGET_PRODUCT_IDX
].id
;
1372 gi
->cdev
.desc
.iSerialNumber
= s
[USB_GADGET_SERIAL_IDX
].id
;
1375 if (gi
->use_os_desc
) {
1376 cdev
->use_os_string
= true;
1377 cdev
->b_vendor_code
= gi
->b_vendor_code
;
1378 memcpy(cdev
->qw_sign
, gi
->qw_sign
, OS_STRING_QW_SIGN_LEN
);
1381 /* Go through all configs, attach all functions */
1382 list_for_each_entry(c
, &gi
->cdev
.configs
, list
) {
1383 struct config_usb_cfg
*cfg
;
1384 struct usb_function
*f
;
1385 struct usb_function
*tmp
;
1386 struct gadget_config_name
*cn
;
1388 cfg
= container_of(c
, struct config_usb_cfg
, c
);
1389 if (!list_empty(&cfg
->string_list
)) {
1391 list_for_each_entry(cn
, &cfg
->string_list
, list
) {
1392 cfg
->gstrings
[i
] = &cn
->stringtab_dev
;
1393 cn
->stringtab_dev
.strings
= &cn
->strings
;
1394 cn
->strings
.s
= cn
->configuration
;
1397 cfg
->gstrings
[i
] = NULL
;
1398 s
= usb_gstrings_attach(&gi
->cdev
, cfg
->gstrings
, 1);
1401 goto err_comp_cleanup
;
1403 c
->iConfiguration
= s
[0].id
;
1406 list_for_each_entry_safe(f
, tmp
, &cfg
->func_list
, list
) {
1408 ret
= usb_add_function(c
, f
);
1410 list_add(&f
->list
, &cfg
->func_list
);
1411 goto err_purge_funcs
;
1414 usb_ep_autoconfig_reset(cdev
->gadget
);
1416 if (cdev
->use_os_string
) {
1417 ret
= composite_os_desc_req_prepare(cdev
, gadget
->ep0
);
1419 goto err_purge_funcs
;
1422 usb_ep_autoconfig_reset(cdev
->gadget
);
1426 purge_configs_funcs(gi
);
1428 composite_dev_cleanup(cdev
);
1432 static void configfs_composite_unbind(struct usb_gadget
*gadget
)
1434 struct usb_composite_dev
*cdev
;
1435 struct gadget_info
*gi
;
1437 /* the gi->lock is hold by the caller */
1439 cdev
= get_gadget_data(gadget
);
1440 gi
= container_of(cdev
, struct gadget_info
, cdev
);
1442 purge_configs_funcs(gi
);
1443 composite_dev_cleanup(cdev
);
1444 usb_ep_autoconfig_reset(cdev
->gadget
);
1445 cdev
->gadget
= NULL
;
1446 set_gadget_data(gadget
, NULL
);
1449 static const struct usb_gadget_driver configfs_driver_template
= {
1450 .bind
= configfs_composite_bind
,
1451 .unbind
= configfs_composite_unbind
,
1453 .setup
= composite_setup
,
1454 .disconnect
= composite_disconnect
,
1456 .max_speed
= USB_SPEED_SUPER
,
1458 .owner
= THIS_MODULE
,
1459 .name
= "configfs-gadget",
1463 static struct config_group
*gadgets_make(
1464 struct config_group
*group
,
1467 struct gadget_info
*gi
;
1469 gi
= kzalloc(sizeof(*gi
), GFP_KERNEL
);
1471 return ERR_PTR(-ENOMEM
);
1473 gi
->group
.default_groups
= gi
->default_groups
;
1474 gi
->group
.default_groups
[0] = &gi
->functions_group
;
1475 gi
->group
.default_groups
[1] = &gi
->configs_group
;
1476 gi
->group
.default_groups
[2] = &gi
->strings_group
;
1477 gi
->group
.default_groups
[3] = &gi
->os_desc_group
;
1479 config_group_init_type_name(&gi
->functions_group
, "functions",
1481 config_group_init_type_name(&gi
->configs_group
, "configs",
1483 config_group_init_type_name(&gi
->strings_group
, "strings",
1484 &gadget_strings_strings_type
);
1485 config_group_init_type_name(&gi
->os_desc_group
, "os_desc",
1488 gi
->composite
.bind
= configfs_do_nothing
;
1489 gi
->composite
.unbind
= configfs_do_nothing
;
1490 gi
->composite
.suspend
= NULL
;
1491 gi
->composite
.resume
= NULL
;
1492 gi
->composite
.max_speed
= USB_SPEED_SUPER
;
1494 mutex_init(&gi
->lock
);
1495 INIT_LIST_HEAD(&gi
->string_list
);
1496 INIT_LIST_HEAD(&gi
->available_func
);
1498 composite_init_dev(&gi
->cdev
);
1499 gi
->cdev
.desc
.bLength
= USB_DT_DEVICE_SIZE
;
1500 gi
->cdev
.desc
.bDescriptorType
= USB_DT_DEVICE
;
1501 gi
->cdev
.desc
.bcdDevice
= cpu_to_le16(get_default_bcdDevice());
1503 gi
->composite
.gadget_driver
= configfs_driver_template
;
1505 gi
->composite
.gadget_driver
.function
= kstrdup(name
, GFP_KERNEL
);
1506 gi
->composite
.name
= gi
->composite
.gadget_driver
.function
;
1508 if (!gi
->composite
.gadget_driver
.function
)
1511 #ifdef CONFIG_USB_OTG
1512 gi
->otg
.bLength
= sizeof(struct usb_otg_descriptor
);
1513 gi
->otg
.bDescriptorType
= USB_DT_OTG
;
1514 gi
->otg
.bmAttributes
= USB_OTG_SRP
| USB_OTG_HNP
;
1517 config_group_init_type_name(&gi
->group
, name
,
1522 return ERR_PTR(-ENOMEM
);
1525 static void gadgets_drop(struct config_group
*group
, struct config_item
*item
)
1527 config_item_put(item
);
1530 static struct configfs_group_operations gadgets_ops
= {
1531 .make_group
= &gadgets_make
,
1532 .drop_item
= &gadgets_drop
,
1535 static struct config_item_type gadgets_type
= {
1536 .ct_group_ops
= &gadgets_ops
,
1537 .ct_owner
= THIS_MODULE
,
1540 static struct configfs_subsystem gadget_subsys
= {
1543 .ci_namebuf
= "usb_gadget",
1544 .ci_type
= &gadgets_type
,
1547 .su_mutex
= __MUTEX_INITIALIZER(gadget_subsys
.su_mutex
),
1550 void unregister_gadget_item(struct config_item
*item
)
1552 struct gadget_info
*gi
= to_gadget_info(item
);
1554 unregister_gadget(gi
);
1556 EXPORT_SYMBOL_GPL(unregister_gadget_item
);
1558 static int __init
gadget_cfs_init(void)
1562 config_group_init(&gadget_subsys
.su_group
);
1564 ret
= configfs_register_subsystem(&gadget_subsys
);
1567 module_init(gadget_cfs_init
);
1569 static void __exit
gadget_cfs_exit(void)
1571 configfs_unregister_subsystem(&gadget_subsys
);
1573 module_exit(gadget_cfs_exit
);