1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/configfs.h>
3 #include <linux/module.h>
4 #include <linux/slab.h>
5 #include <linux/device.h>
6 #include <linux/kstrtox.h>
8 #include <linux/usb/composite.h>
9 #include <linux/usb/gadget_configfs.h>
10 #include <linux/usb/webusb.h>
13 #include "u_os_desc.h"
15 int check_user_usb_string(const char *name,
16 struct usb_gadget_strings *stringtab_dev)
21 ret = kstrtou16(name, 0, &num);
25 if (!usb_validate_langid(num))
28 stringtab_dev->language = num;
32 #define MAX_NAME_LEN 40
33 #define MAX_USB_STRING_LANGS 2
35 static const struct usb_descriptor_header *otg_desc[2];
38 struct config_group group;
39 struct config_group functions_group;
40 struct config_group configs_group;
41 struct config_group strings_group;
42 struct config_group os_desc_group;
43 struct config_group webusb_group;
46 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
47 struct list_head string_list;
48 struct list_head available_func;
50 struct usb_composite_driver composite;
51 struct usb_composite_dev cdev;
54 char qw_sign[OS_STRING_QW_SIGN_LEN];
56 u16 bcd_webusb_version;
57 u8 b_webusb_vendor_code;
58 char landing_page[WEBUSB_URL_RAW_MAX_LENGTH];
64 static inline struct gadget_info *to_gadget_info(struct config_item *item)
66 return container_of(to_config_group(item), struct gadget_info, group);
69 struct config_usb_cfg {
70 struct config_group group;
71 struct config_group strings_group;
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 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80 return container_of(to_config_group(item), struct config_usb_cfg,
84 static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
86 return container_of(cfg->c.cdev, struct gadget_info, cdev);
89 struct gadget_language {
90 struct usb_gadget_strings stringtab_dev;
91 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
96 struct config_group group;
97 struct list_head list;
98 struct list_head gadget_strings;
99 unsigned int nstrings;
102 struct gadget_config_name {
103 struct usb_gadget_strings stringtab_dev;
104 struct usb_string strings;
107 struct config_group group;
108 struct list_head list;
111 #define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
113 static int usb_string_copy(const char *s, char **s_copy)
117 char *copy = *s_copy;
119 if (ret > USB_MAX_STRING_LEN)
125 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
130 if (str[ret - 1] == '\n')
136 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
137 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
140 return sprintf(page, "0x%02x\n", \
141 to_gadget_info(item)->cdev.desc.__name); \
144 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
145 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
148 return sprintf(page, "0x%04x\n", \
149 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
153 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
154 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
155 const char *page, size_t len) \
159 ret = kstrtou8(page, 0, &val); \
162 to_gadget_info(item)->cdev.desc._name = val; \
166 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
167 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
168 const char *page, size_t len) \
172 ret = kstrtou16(page, 0, &val); \
175 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
179 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
180 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
181 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
183 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
184 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
185 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
186 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
187 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
188 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
189 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
190 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
192 static ssize_t is_valid_bcd(u16 bcd_val)
194 if ((bcd_val & 0xf) > 9)
196 if (((bcd_val >> 4) & 0xf) > 9)
198 if (((bcd_val >> 8) & 0xf) > 9)
200 if (((bcd_val >> 12) & 0xf) > 9)
205 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
206 const char *page, size_t len)
211 ret = kstrtou16(page, 0, &bcdDevice);
214 ret = is_valid_bcd(bcdDevice);
218 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
222 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
223 const char *page, size_t len)
228 ret = kstrtou16(page, 0, &bcdUSB);
231 ret = is_valid_bcd(bcdUSB);
235 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
239 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
241 struct gadget_info *gi = to_gadget_info(item);
245 mutex_lock(&gi->lock);
246 udc_name = gi->composite.gadget_driver.udc_name;
247 ret = sprintf(page, "%s\n", udc_name ?: "");
248 mutex_unlock(&gi->lock);
253 static int unregister_gadget(struct gadget_info *gi)
257 if (!gi->composite.gadget_driver.udc_name)
260 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
263 kfree(gi->composite.gadget_driver.udc_name);
264 gi->composite.gadget_driver.udc_name = NULL;
268 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
269 const char *page, size_t len)
271 struct gadget_info *gi = to_gadget_info(item);
275 if (strlen(page) < len)
278 name = kstrdup(page, GFP_KERNEL);
281 if (name[len - 1] == '\n')
282 name[len - 1] = '\0';
284 mutex_lock(&gi->lock);
287 ret = unregister_gadget(gi);
292 if (gi->composite.gadget_driver.udc_name) {
296 gi->composite.gadget_driver.udc_name = name;
297 ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
299 gi->composite.gadget_driver.udc_name = NULL;
303 mutex_unlock(&gi->lock);
307 mutex_unlock(&gi->lock);
311 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
314 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
316 return sprintf(page, "%s\n", usb_speed_string(speed));
319 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
320 const char *page, size_t len)
322 struct gadget_info *gi = to_gadget_info(item);
324 mutex_lock(&gi->lock);
326 /* Prevent changing of max_speed after the driver is binded */
327 if (gi->composite.gadget_driver.udc_name)
330 if (strncmp(page, "super-speed-plus", 16) == 0)
331 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
332 else if (strncmp(page, "super-speed", 11) == 0)
333 gi->composite.max_speed = USB_SPEED_SUPER;
334 else if (strncmp(page, "high-speed", 10) == 0)
335 gi->composite.max_speed = USB_SPEED_HIGH;
336 else if (strncmp(page, "full-speed", 10) == 0)
337 gi->composite.max_speed = USB_SPEED_FULL;
338 else if (strncmp(page, "low-speed", 9) == 0)
339 gi->composite.max_speed = USB_SPEED_LOW;
343 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
345 mutex_unlock(&gi->lock);
348 mutex_unlock(&gi->lock);
352 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
353 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
354 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
355 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
356 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
357 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
358 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
359 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
360 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
361 CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
363 static struct configfs_attribute *gadget_root_attrs[] = {
364 &gadget_dev_desc_attr_bDeviceClass,
365 &gadget_dev_desc_attr_bDeviceSubClass,
366 &gadget_dev_desc_attr_bDeviceProtocol,
367 &gadget_dev_desc_attr_bMaxPacketSize0,
368 &gadget_dev_desc_attr_idVendor,
369 &gadget_dev_desc_attr_idProduct,
370 &gadget_dev_desc_attr_bcdDevice,
371 &gadget_dev_desc_attr_bcdUSB,
372 &gadget_dev_desc_attr_UDC,
373 &gadget_dev_desc_attr_max_speed,
377 static inline struct gadget_language *to_gadget_language(struct config_item *item)
379 return container_of(to_config_group(item), struct gadget_language,
383 static inline struct gadget_config_name *to_gadget_config_name(
384 struct config_item *item)
386 return container_of(to_config_group(item), struct gadget_config_name,
390 static inline struct usb_function_instance *to_usb_function_instance(
391 struct config_item *item)
393 return container_of(to_config_group(item),
394 struct usb_function_instance, group);
397 static void gadget_info_attr_release(struct config_item *item)
399 struct gadget_info *gi = to_gadget_info(item);
401 WARN_ON(!list_empty(&gi->cdev.configs));
402 WARN_ON(!list_empty(&gi->string_list));
403 WARN_ON(!list_empty(&gi->available_func));
404 kfree(gi->composite.gadget_driver.function);
405 kfree(gi->composite.gadget_driver.driver.name);
409 static struct configfs_item_operations gadget_root_item_ops = {
410 .release = gadget_info_attr_release,
413 static void gadget_config_attr_release(struct config_item *item)
415 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
417 WARN_ON(!list_empty(&cfg->c.functions));
418 list_del(&cfg->c.list);
423 static int config_usb_cfg_link(
424 struct config_item *usb_cfg_ci,
425 struct config_item *usb_func_ci)
427 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
428 struct gadget_info *gi = cfg_to_gadget_info(cfg);
430 struct usb_function_instance *fi =
431 to_usb_function_instance(usb_func_ci);
432 struct usb_function_instance *a_fi = NULL, *iter;
433 struct usb_function *f;
436 mutex_lock(&gi->lock);
438 * Make sure this function is from within our _this_ gadget and not
439 * from another gadget or a random directory.
440 * Also a function instance can only be linked once.
443 if (gi->composite.gadget_driver.udc_name) {
448 list_for_each_entry(iter, &gi->available_func, cfs_list) {
459 list_for_each_entry(f, &cfg->func_list, list) {
466 f = usb_get_function(fi);
472 /* stash the function until we bind it to the gadget */
473 list_add_tail(&f->list, &cfg->func_list);
476 mutex_unlock(&gi->lock);
480 static void config_usb_cfg_unlink(
481 struct config_item *usb_cfg_ci,
482 struct config_item *usb_func_ci)
484 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
485 struct gadget_info *gi = cfg_to_gadget_info(cfg);
487 struct usb_function_instance *fi =
488 to_usb_function_instance(usb_func_ci);
489 struct usb_function *f;
492 * ideally I would like to forbid to unlink functions while a gadget is
493 * bound to an UDC. Since this isn't possible at the moment, we simply
494 * force an unbind, the function is available here and then we can
495 * remove the function.
497 mutex_lock(&gi->lock);
498 if (gi->composite.gadget_driver.udc_name)
499 unregister_gadget(gi);
500 WARN_ON(gi->composite.gadget_driver.udc_name);
502 list_for_each_entry(f, &cfg->func_list, list) {
506 mutex_unlock(&gi->lock);
510 mutex_unlock(&gi->lock);
511 WARN(1, "Unable to locate function to unbind\n");
514 static struct configfs_item_operations gadget_config_item_ops = {
515 .release = gadget_config_attr_release,
516 .allow_link = config_usb_cfg_link,
517 .drop_link = config_usb_cfg_unlink,
521 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
524 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
526 return sprintf(page, "%u\n", cfg->c.MaxPower);
529 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
530 const char *page, size_t len)
532 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
535 ret = kstrtou16(page, 0, &val);
538 if (DIV_ROUND_UP(val, 8) > 0xff)
540 cfg->c.MaxPower = val;
544 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
547 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
549 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
552 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
553 const char *page, size_t len)
555 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
558 ret = kstrtou8(page, 0, &val);
561 if (!(val & USB_CONFIG_ATT_ONE))
563 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
564 USB_CONFIG_ATT_WAKEUP))
566 cfg->c.bmAttributes = val;
570 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
571 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
573 static struct configfs_attribute *gadget_config_attrs[] = {
574 &gadget_config_desc_attr_MaxPower,
575 &gadget_config_desc_attr_bmAttributes,
579 static const struct config_item_type gadget_config_type = {
580 .ct_item_ops = &gadget_config_item_ops,
581 .ct_attrs = gadget_config_attrs,
582 .ct_owner = THIS_MODULE,
585 static const struct config_item_type gadget_root_type = {
586 .ct_item_ops = &gadget_root_item_ops,
587 .ct_attrs = gadget_root_attrs,
588 .ct_owner = THIS_MODULE,
591 static void composite_init_dev(struct usb_composite_dev *cdev)
593 spin_lock_init(&cdev->lock);
594 INIT_LIST_HEAD(&cdev->configs);
595 INIT_LIST_HEAD(&cdev->gstrings);
598 static struct config_group *function_make(
599 struct config_group *group,
602 struct gadget_info *gi;
603 struct usb_function_instance *fi;
604 char buf[MAX_NAME_LEN];
609 if (strlen(name) >= MAX_NAME_LEN)
610 return ERR_PTR(-ENAMETOOLONG);
612 scnprintf(buf, MAX_NAME_LEN, "%s", name);
615 instance_name = strchr(func_name, '.');
616 if (!instance_name) {
617 pr_err("Unable to locate . in FUNC.INSTANCE\n");
618 return ERR_PTR(-EINVAL);
620 *instance_name = '\0';
623 fi = usb_get_function_instance(func_name);
627 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
629 usb_put_function_instance(fi);
632 if (fi->set_inst_name) {
633 ret = fi->set_inst_name(fi, instance_name);
635 usb_put_function_instance(fi);
640 gi = container_of(group, struct gadget_info, functions_group);
642 mutex_lock(&gi->lock);
643 list_add_tail(&fi->cfs_list, &gi->available_func);
644 mutex_unlock(&gi->lock);
648 static void function_drop(
649 struct config_group *group,
650 struct config_item *item)
652 struct usb_function_instance *fi = to_usb_function_instance(item);
653 struct gadget_info *gi;
655 gi = container_of(group, struct gadget_info, functions_group);
657 mutex_lock(&gi->lock);
658 list_del(&fi->cfs_list);
659 mutex_unlock(&gi->lock);
660 config_item_put(item);
663 static struct configfs_group_operations functions_ops = {
664 .make_group = &function_make,
665 .drop_item = &function_drop,
668 static const struct config_item_type functions_type = {
669 .ct_group_ops = &functions_ops,
670 .ct_owner = THIS_MODULE,
673 GS_STRINGS_RW(gadget_config_name, configuration);
675 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
676 &gadget_config_name_attr_configuration,
680 static void gadget_config_name_attr_release(struct config_item *item)
682 struct gadget_config_name *cn = to_gadget_config_name(item);
684 kfree(cn->configuration);
690 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
691 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
693 static struct config_group *config_desc_make(
694 struct config_group *group,
697 struct gadget_info *gi;
698 struct config_usb_cfg *cfg;
699 char buf[MAX_NAME_LEN];
704 gi = container_of(group, struct gadget_info, configs_group);
706 if (strlen(name) >= MAX_NAME_LEN)
707 return ERR_PTR(-ENAMETOOLONG);
709 scnprintf(buf, MAX_NAME_LEN, "%s", name);
711 num_str = strchr(buf, '.');
713 pr_err("Unable to locate . in name.bConfigurationValue\n");
714 return ERR_PTR(-EINVAL);
721 return ERR_PTR(-EINVAL);
723 ret = kstrtou8(num_str, 0, &num);
727 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
729 return ERR_PTR(-ENOMEM);
730 cfg->c.label = kstrdup(buf, GFP_KERNEL);
735 cfg->c.bConfigurationValue = num;
736 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
737 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
738 INIT_LIST_HEAD(&cfg->string_list);
739 INIT_LIST_HEAD(&cfg->func_list);
741 config_group_init_type_name(&cfg->group, name,
742 &gadget_config_type);
744 config_group_init_type_name(&cfg->strings_group, "strings",
745 &gadget_config_name_strings_type);
746 configfs_add_default_group(&cfg->strings_group, &cfg->group);
748 ret = usb_add_config_only(&gi->cdev, &cfg->c);
759 static void config_desc_drop(
760 struct config_group *group,
761 struct config_item *item)
763 config_item_put(item);
766 static struct configfs_group_operations config_desc_ops = {
767 .make_group = &config_desc_make,
768 .drop_item = &config_desc_drop,
771 static const struct config_item_type config_desc_type = {
772 .ct_group_ops = &config_desc_ops,
773 .ct_owner = THIS_MODULE,
776 GS_STRINGS_RW(gadget_language, manufacturer);
777 GS_STRINGS_RW(gadget_language, product);
778 GS_STRINGS_RW(gadget_language, serialnumber);
780 static struct configfs_attribute *gadget_language_langid_attrs[] = {
781 &gadget_language_attr_manufacturer,
782 &gadget_language_attr_product,
783 &gadget_language_attr_serialnumber,
787 static void gadget_language_attr_release(struct config_item *item)
789 struct gadget_language *gs = to_gadget_language(item);
791 kfree(gs->manufacturer);
793 kfree(gs->serialnumber);
799 static struct configfs_item_operations gadget_language_langid_item_ops = {
800 .release = gadget_language_attr_release,
803 static ssize_t gadget_string_id_show(struct config_item *item, char *page)
805 struct gadget_string *string = to_gadget_string(item);
808 ret = sprintf(page, "%u\n", string->usb_string.id);
811 CONFIGFS_ATTR_RO(gadget_string_, id);
813 static ssize_t gadget_string_s_show(struct config_item *item, char *page)
815 struct gadget_string *string = to_gadget_string(item);
818 ret = sysfs_emit(page, "%s\n", string->string);
822 static ssize_t gadget_string_s_store(struct config_item *item, const char *page,
825 struct gadget_string *string = to_gadget_string(item);
826 int size = min(sizeof(string->string), len + 1);
828 if (len > USB_MAX_STRING_LEN)
831 return strscpy(string->string, page, size);
833 CONFIGFS_ATTR(gadget_string_, s);
835 static struct configfs_attribute *gadget_string_attrs[] = {
836 &gadget_string_attr_id,
837 &gadget_string_attr_s,
841 static void gadget_string_release(struct config_item *item)
843 struct gadget_string *string = to_gadget_string(item);
848 static struct configfs_item_operations gadget_string_item_ops = {
849 .release = gadget_string_release,
852 static const struct config_item_type gadget_string_type = {
853 .ct_item_ops = &gadget_string_item_ops,
854 .ct_attrs = gadget_string_attrs,
855 .ct_owner = THIS_MODULE,
858 static struct config_item *gadget_language_string_make(struct config_group *group,
861 struct gadget_language *language;
862 struct gadget_string *string;
864 language = to_gadget_language(&group->cg_item);
866 string = kzalloc(sizeof(*string), GFP_KERNEL);
868 return ERR_PTR(-ENOMEM);
870 string->usb_string.id = language->nstrings++;
871 string->usb_string.s = string->string;
872 list_add_tail(&string->list, &language->gadget_strings);
874 config_item_init_type_name(&string->item, name, &gadget_string_type);
876 return &string->item;
879 static void gadget_language_string_drop(struct config_group *group,
880 struct config_item *item)
882 struct gadget_language *language;
883 struct gadget_string *string;
884 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX;
886 language = to_gadget_language(&group->cg_item);
887 string = to_gadget_string(item);
889 list_del(&string->list);
890 language->nstrings--;
892 /* Reset the ids for the language's strings to guarantee a continuous set */
893 list_for_each_entry(string, &language->gadget_strings, list)
894 string->usb_string.id = i++;
897 static struct configfs_group_operations gadget_language_langid_group_ops = {
898 .make_item = gadget_language_string_make,
899 .drop_item = gadget_language_string_drop,
902 static struct config_item_type gadget_language_type = {
903 .ct_item_ops = &gadget_language_langid_item_ops,
904 .ct_group_ops = &gadget_language_langid_group_ops,
905 .ct_attrs = gadget_language_langid_attrs,
906 .ct_owner = THIS_MODULE,
909 static struct config_group *gadget_language_make(struct config_group *group,
912 struct gadget_info *gi;
913 struct gadget_language *gs;
914 struct gadget_language *new;
918 new = kzalloc(sizeof(*new), GFP_KERNEL);
920 return ERR_PTR(-ENOMEM);
922 ret = check_user_usb_string(name, &new->stringtab_dev);
925 config_group_init_type_name(&new->group, name,
926 &gadget_language_type);
928 gi = container_of(group, struct gadget_info, strings_group);
930 list_for_each_entry(gs, &gi->string_list, list) {
931 if (gs->stringtab_dev.language == new->stringtab_dev.language)
936 if (langs >= MAX_USB_STRING_LANGS)
939 list_add_tail(&new->list, &gi->string_list);
940 INIT_LIST_HEAD(&new->gadget_strings);
942 /* We have the default manufacturer, product and serialnumber strings */
950 static void gadget_language_drop(struct config_group *group,
951 struct config_item *item)
953 config_item_put(item);
956 static struct configfs_group_operations gadget_language_group_ops = {
957 .make_group = &gadget_language_make,
958 .drop_item = &gadget_language_drop,
961 static struct config_item_type gadget_language_strings_type = {
962 .ct_group_ops = &gadget_language_group_ops,
963 .ct_owner = THIS_MODULE,
966 static inline struct gadget_info *webusb_item_to_gadget_info(
967 struct config_item *item)
969 return container_of(to_config_group(item),
970 struct gadget_info, webusb_group);
973 static ssize_t webusb_use_show(struct config_item *item, char *page)
975 return sysfs_emit(page, "%d\n",
976 webusb_item_to_gadget_info(item)->use_webusb);
979 static ssize_t webusb_use_store(struct config_item *item, const char *page,
982 struct gadget_info *gi = webusb_item_to_gadget_info(item);
986 ret = kstrtobool(page, &use);
990 mutex_lock(&gi->lock);
991 gi->use_webusb = use;
992 mutex_unlock(&gi->lock);
997 static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page)
999 return sysfs_emit(page, "0x%04x\n",
1000 webusb_item_to_gadget_info(item)->bcd_webusb_version);
1003 static ssize_t webusb_bcdVersion_store(struct config_item *item,
1004 const char *page, size_t len)
1006 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1010 ret = kstrtou16(page, 0, &bcdVersion);
1014 ret = is_valid_bcd(bcdVersion);
1018 mutex_lock(&gi->lock);
1019 gi->bcd_webusb_version = bcdVersion;
1020 mutex_unlock(&gi->lock);
1025 static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page)
1027 return sysfs_emit(page, "0x%02x\n",
1028 webusb_item_to_gadget_info(item)->b_webusb_vendor_code);
1031 static ssize_t webusb_bVendorCode_store(struct config_item *item,
1032 const char *page, size_t len)
1034 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1038 ret = kstrtou8(page, 0, &b_vendor_code);
1042 mutex_lock(&gi->lock);
1043 gi->b_webusb_vendor_code = b_vendor_code;
1044 mutex_unlock(&gi->lock);
1049 static ssize_t webusb_landingPage_show(struct config_item *item, char *page)
1051 return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page);
1054 static ssize_t webusb_landingPage_store(struct config_item *item, const char *page,
1057 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1058 unsigned int bytes_to_strip = 0;
1061 if (page[l - 1] == '\n') {
1066 if (l > sizeof(gi->landing_page)) {
1067 pr_err("webusb: landingPage URL too long\n");
1072 if (strncasecmp(page, "https://", 8) == 0)
1074 else if (strncasecmp(page, "http://", 7) == 0)
1079 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) {
1080 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n",
1081 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip);
1085 mutex_lock(&gi->lock);
1086 // ensure 0 bytes are set, in case the new landing page is shorter then the old one.
1087 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0);
1088 mutex_unlock(&gi->lock);
1093 CONFIGFS_ATTR(webusb_, use);
1094 CONFIGFS_ATTR(webusb_, bVendorCode);
1095 CONFIGFS_ATTR(webusb_, bcdVersion);
1096 CONFIGFS_ATTR(webusb_, landingPage);
1098 static struct configfs_attribute *webusb_attrs[] = {
1100 &webusb_attr_bcdVersion,
1101 &webusb_attr_bVendorCode,
1102 &webusb_attr_landingPage,
1106 static struct config_item_type webusb_type = {
1107 .ct_attrs = webusb_attrs,
1108 .ct_owner = THIS_MODULE,
1111 static inline struct gadget_info *os_desc_item_to_gadget_info(
1112 struct config_item *item)
1114 return container_of(to_config_group(item),
1115 struct gadget_info, os_desc_group);
1118 static ssize_t os_desc_use_show(struct config_item *item, char *page)
1120 return sprintf(page, "%d\n",
1121 os_desc_item_to_gadget_info(item)->use_os_desc);
1124 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
1127 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1131 ret = kstrtobool(page, &use);
1135 mutex_lock(&gi->lock);
1136 gi->use_os_desc = use;
1137 mutex_unlock(&gi->lock);
1142 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
1144 return sprintf(page, "0x%02x\n",
1145 os_desc_item_to_gadget_info(item)->b_vendor_code);
1148 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
1149 const char *page, size_t len)
1151 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1155 ret = kstrtou8(page, 0, &b_vendor_code);
1159 mutex_lock(&gi->lock);
1160 gi->b_vendor_code = b_vendor_code;
1161 mutex_unlock(&gi->lock);
1166 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
1168 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1171 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
1172 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
1178 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
1181 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1184 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
1185 if (page[l - 1] == '\n')
1188 mutex_lock(&gi->lock);
1189 res = utf8s_to_utf16s(page, l,
1190 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
1191 OS_STRING_QW_SIGN_LEN);
1194 mutex_unlock(&gi->lock);
1199 CONFIGFS_ATTR(os_desc_, use);
1200 CONFIGFS_ATTR(os_desc_, b_vendor_code);
1201 CONFIGFS_ATTR(os_desc_, qw_sign);
1203 static struct configfs_attribute *os_desc_attrs[] = {
1205 &os_desc_attr_b_vendor_code,
1206 &os_desc_attr_qw_sign,
1210 static int os_desc_link(struct config_item *os_desc_ci,
1211 struct config_item *usb_cfg_ci)
1213 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
1214 struct usb_composite_dev *cdev = &gi->cdev;
1215 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
1216 struct usb_configuration *c = NULL, *iter;
1219 mutex_lock(&gi->lock);
1220 list_for_each_entry(iter, &cdev->configs, list) {
1221 if (iter != &c_target->c)
1231 if (cdev->os_desc_config) {
1236 cdev->os_desc_config = &c_target->c;
1240 mutex_unlock(&gi->lock);
1244 static void os_desc_unlink(struct config_item *os_desc_ci,
1245 struct config_item *usb_cfg_ci)
1247 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
1248 struct usb_composite_dev *cdev = &gi->cdev;
1250 mutex_lock(&gi->lock);
1251 if (gi->composite.gadget_driver.udc_name)
1252 unregister_gadget(gi);
1253 cdev->os_desc_config = NULL;
1254 WARN_ON(gi->composite.gadget_driver.udc_name);
1255 mutex_unlock(&gi->lock);
1258 static struct configfs_item_operations os_desc_ops = {
1259 .allow_link = os_desc_link,
1260 .drop_link = os_desc_unlink,
1263 static struct config_item_type os_desc_type = {
1264 .ct_item_ops = &os_desc_ops,
1265 .ct_attrs = os_desc_attrs,
1266 .ct_owner = THIS_MODULE,
1269 static inline struct usb_os_desc_ext_prop
1270 *to_usb_os_desc_ext_prop(struct config_item *item)
1272 return container_of(item, struct usb_os_desc_ext_prop, item);
1275 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
1277 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
1280 static ssize_t ext_prop_type_store(struct config_item *item,
1281 const char *page, size_t len)
1283 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1284 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1288 ret = kstrtou8(page, 0, &type);
1292 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI)
1295 if (desc->opts_mutex)
1296 mutex_lock(desc->opts_mutex);
1298 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
1299 ext_prop->type == USB_EXT_PROP_LE32 ||
1300 ext_prop->type == USB_EXT_PROP_BE32) &&
1301 (type == USB_EXT_PROP_UNICODE ||
1302 type == USB_EXT_PROP_UNICODE_ENV ||
1303 type == USB_EXT_PROP_UNICODE_LINK))
1304 ext_prop->data_len <<= 1;
1305 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
1306 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1307 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
1308 (type == USB_EXT_PROP_BINARY ||
1309 type == USB_EXT_PROP_LE32 ||
1310 type == USB_EXT_PROP_BE32))
1311 ext_prop->data_len >>= 1;
1312 ext_prop->type = type;
1314 if (desc->opts_mutex)
1315 mutex_unlock(desc->opts_mutex);
1319 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1321 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1322 int len = ext_prop->data_len;
1324 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1325 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1326 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1328 memcpy(page, ext_prop->data, len);
1333 static ssize_t ext_prop_data_store(struct config_item *item,
1334 const char *page, size_t len)
1336 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1337 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1339 size_t ret_len = len;
1341 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1343 new_data = kmemdup(page, len, GFP_KERNEL);
1347 if (desc->opts_mutex)
1348 mutex_lock(desc->opts_mutex);
1349 kfree(ext_prop->data);
1350 ext_prop->data = new_data;
1351 desc->ext_prop_len -= ext_prop->data_len;
1352 ext_prop->data_len = len;
1353 desc->ext_prop_len += ext_prop->data_len;
1354 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1355 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1356 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1357 desc->ext_prop_len -= ext_prop->data_len;
1358 ext_prop->data_len <<= 1;
1359 ext_prop->data_len += 2;
1360 desc->ext_prop_len += ext_prop->data_len;
1362 if (desc->opts_mutex)
1363 mutex_unlock(desc->opts_mutex);
1367 CONFIGFS_ATTR(ext_prop_, type);
1368 CONFIGFS_ATTR(ext_prop_, data);
1370 static struct configfs_attribute *ext_prop_attrs[] = {
1371 &ext_prop_attr_type,
1372 &ext_prop_attr_data,
1376 static void usb_os_desc_ext_prop_release(struct config_item *item)
1378 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1380 kfree(ext_prop); /* frees a whole chunk */
1383 static struct configfs_item_operations ext_prop_ops = {
1384 .release = usb_os_desc_ext_prop_release,
1387 static struct config_item *ext_prop_make(
1388 struct config_group *group,
1391 struct usb_os_desc_ext_prop *ext_prop;
1392 struct config_item_type *ext_prop_type;
1393 struct usb_os_desc *desc;
1396 vla_group(data_chunk);
1397 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1398 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1400 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1402 return ERR_PTR(-ENOMEM);
1404 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1405 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1407 desc = container_of(group, struct usb_os_desc, group);
1408 ext_prop_type->ct_item_ops = &ext_prop_ops;
1409 ext_prop_type->ct_attrs = ext_prop_attrs;
1410 ext_prop_type->ct_owner = desc->owner;
1412 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1414 ext_prop->name = kstrdup(name, GFP_KERNEL);
1415 if (!ext_prop->name) {
1417 return ERR_PTR(-ENOMEM);
1419 desc->ext_prop_len += 14;
1420 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1421 if (desc->opts_mutex)
1422 mutex_lock(desc->opts_mutex);
1423 desc->ext_prop_len += ext_prop->name_len;
1424 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1425 ++desc->ext_prop_count;
1426 if (desc->opts_mutex)
1427 mutex_unlock(desc->opts_mutex);
1429 return &ext_prop->item;
1432 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1434 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1435 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1437 if (desc->opts_mutex)
1438 mutex_lock(desc->opts_mutex);
1439 list_del(&ext_prop->entry);
1440 --desc->ext_prop_count;
1441 kfree(ext_prop->name);
1442 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1443 if (desc->opts_mutex)
1444 mutex_unlock(desc->opts_mutex);
1445 config_item_put(item);
1448 static struct configfs_group_operations interf_grp_ops = {
1449 .make_item = &ext_prop_make,
1450 .drop_item = &ext_prop_drop,
1453 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1456 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1460 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1461 const char *page, size_t len)
1463 struct usb_os_desc *desc = to_usb_os_desc(item);
1466 l = min_t(int, 8, len);
1467 if (page[l - 1] == '\n')
1469 if (desc->opts_mutex)
1470 mutex_lock(desc->opts_mutex);
1471 memcpy(desc->ext_compat_id, page, l);
1473 if (desc->opts_mutex)
1474 mutex_unlock(desc->opts_mutex);
1479 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1482 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1486 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1487 const char *page, size_t len)
1489 struct usb_os_desc *desc = to_usb_os_desc(item);
1492 l = min_t(int, 8, len);
1493 if (page[l - 1] == '\n')
1495 if (desc->opts_mutex)
1496 mutex_lock(desc->opts_mutex);
1497 memcpy(desc->ext_compat_id + 8, page, l);
1499 if (desc->opts_mutex)
1500 mutex_unlock(desc->opts_mutex);
1505 CONFIGFS_ATTR(interf_grp_, compatible_id);
1506 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1508 static struct configfs_attribute *interf_grp_attrs[] = {
1509 &interf_grp_attr_compatible_id,
1510 &interf_grp_attr_sub_compatible_id,
1514 struct config_group *usb_os_desc_prepare_interf_dir(
1515 struct config_group *parent,
1517 struct usb_os_desc **desc,
1519 struct module *owner)
1521 struct config_group *os_desc_group;
1522 struct config_item_type *os_desc_type, *interface_type;
1524 vla_group(data_chunk);
1525 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1526 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1527 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1529 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1531 return ERR_PTR(-ENOMEM);
1533 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1534 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1535 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1537 os_desc_type->ct_owner = owner;
1538 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1539 configfs_add_default_group(os_desc_group, parent);
1541 interface_type->ct_group_ops = &interf_grp_ops;
1542 interface_type->ct_attrs = interf_grp_attrs;
1543 interface_type->ct_owner = owner;
1545 while (n_interf--) {
1546 struct usb_os_desc *d;
1550 config_group_init_type_name(&d->group, "", interface_type);
1551 config_item_set_name(&d->group.cg_item, "interface.%s",
1553 configfs_add_default_group(&d->group, os_desc_group);
1556 return os_desc_group;
1558 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1560 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1566 int composite_dev_prepare(struct usb_composite_driver *composite,
1567 struct usb_composite_dev *dev);
1569 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1570 struct usb_ep *ep0);
1572 static void purge_configs_funcs(struct gadget_info *gi)
1574 struct usb_configuration *c;
1576 list_for_each_entry(c, &gi->cdev.configs, list) {
1577 struct usb_function *f, *tmp;
1578 struct config_usb_cfg *cfg;
1580 cfg = container_of(c, struct config_usb_cfg, c);
1582 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1584 list_move(&f->list, &cfg->func_list);
1586 dev_dbg(&gi->cdev.gadget->dev,
1587 "unbind function '%s'/%p\n",
1592 c->next_interface_id = 0;
1593 memset(c->interface, 0, sizeof(c->interface));
1594 c->superspeed_plus = 0;
1601 static struct usb_string *
1602 configfs_attach_gadget_strings(struct gadget_info *gi)
1604 struct usb_gadget_strings **gadget_strings;
1605 struct gadget_language *language;
1606 struct gadget_string *string;
1607 unsigned int nlangs = 0;
1608 struct list_head *iter;
1609 struct usb_string *us;
1614 list_for_each(iter, &gi->string_list)
1617 /* Bail out early if no languages are configured */
1621 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */
1622 sizeof(struct usb_gadget_strings *), GFP_KERNEL);
1623 if (!gadget_strings)
1624 return ERR_PTR(-ENOMEM);
1626 list_for_each_entry(language, &gi->string_list, list) {
1627 struct usb_string *stringtab;
1629 if (nstrings == -1) {
1630 nstrings = language->nstrings;
1631 } else if (nstrings != language->nstrings) {
1632 pr_err("languages must contain the same number of strings\n");
1633 us = ERR_PTR(-EINVAL);
1637 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string),
1640 us = ERR_PTR(-ENOMEM);
1644 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX;
1645 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer;
1646 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX;
1647 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product;
1648 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX;
1649 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber;
1651 j = USB_GADGET_FIRST_AVAIL_IDX;
1652 list_for_each_entry(string, &language->gadget_strings, list) {
1653 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string));
1657 language->stringtab_dev.strings = stringtab;
1658 gadget_strings[i] = &language->stringtab_dev;
1662 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings);
1665 list_for_each_entry(language, &gi->string_list, list) {
1666 kfree(language->stringtab_dev.strings);
1667 language->stringtab_dev.strings = NULL;
1670 kfree(gadget_strings);
1675 static int configfs_composite_bind(struct usb_gadget *gadget,
1676 struct usb_gadget_driver *gdriver)
1678 struct usb_composite_driver *composite = to_cdriver(gdriver);
1679 struct gadget_info *gi = container_of(composite,
1680 struct gadget_info, composite);
1681 struct usb_composite_dev *cdev = &gi->cdev;
1682 struct usb_configuration *c;
1683 struct usb_string *s;
1687 /* the gi->lock is hold by the caller */
1689 cdev->gadget = gadget;
1690 set_gadget_data(gadget, cdev);
1691 ret = composite_dev_prepare(composite, cdev);
1694 /* and now the gadget bind */
1697 if (list_empty(&gi->cdev.configs)) {
1698 pr_err("Need at least one configuration in %s.\n",
1699 gi->composite.name);
1700 goto err_comp_cleanup;
1704 list_for_each_entry(c, &gi->cdev.configs, list) {
1705 struct config_usb_cfg *cfg;
1707 cfg = container_of(c, struct config_usb_cfg, c);
1708 if (list_empty(&cfg->func_list)) {
1709 pr_err("Config %s/%d of %s needs at least one function.\n",
1710 c->label, c->bConfigurationValue,
1711 gi->composite.name);
1712 goto err_comp_cleanup;
1716 /* init all strings */
1717 if (!list_empty(&gi->string_list)) {
1718 s = configfs_attach_gadget_strings(gi);
1721 goto err_comp_cleanup;
1724 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1725 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1726 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1728 gi->cdev.usb_strings = s;
1731 if (gi->use_webusb) {
1732 cdev->use_webusb = true;
1733 cdev->bcd_webusb_version = gi->bcd_webusb_version;
1734 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code;
1735 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH);
1738 if (gi->use_os_desc) {
1739 cdev->use_os_string = true;
1740 cdev->b_vendor_code = gi->b_vendor_code;
1741 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1744 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1745 struct usb_descriptor_header *usb_desc;
1747 usb_desc = usb_otg_descriptor_alloc(gadget);
1750 goto err_comp_cleanup;
1752 usb_otg_descriptor_init(gadget, usb_desc);
1753 otg_desc[0] = usb_desc;
1757 /* Go through all configs, attach all functions */
1758 list_for_each_entry(c, &gi->cdev.configs, list) {
1759 struct config_usb_cfg *cfg;
1760 struct usb_function *f;
1761 struct usb_function *tmp;
1762 struct gadget_config_name *cn;
1764 if (gadget_is_otg(gadget))
1765 c->descriptors = otg_desc;
1767 /* Properly configure the bmAttributes wakeup bit */
1768 check_remote_wakeup_config(gadget, c);
1770 cfg = container_of(c, struct config_usb_cfg, c);
1771 if (!list_empty(&cfg->string_list)) {
1773 list_for_each_entry(cn, &cfg->string_list, list) {
1774 cfg->gstrings[i] = &cn->stringtab_dev;
1775 cn->stringtab_dev.strings = &cn->strings;
1776 cn->strings.s = cn->configuration;
1779 cfg->gstrings[i] = NULL;
1780 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1783 goto err_comp_cleanup;
1785 c->iConfiguration = s[0].id;
1788 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1790 ret = usb_add_function(c, f);
1792 list_add(&f->list, &cfg->func_list);
1793 goto err_purge_funcs;
1796 ret = usb_gadget_check_config(cdev->gadget);
1798 goto err_purge_funcs;
1800 usb_ep_autoconfig_reset(cdev->gadget);
1802 if (cdev->use_os_string) {
1803 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1805 goto err_purge_funcs;
1808 usb_ep_autoconfig_reset(cdev->gadget);
1812 purge_configs_funcs(gi);
1814 composite_dev_cleanup(cdev);
1818 static void configfs_composite_unbind(struct usb_gadget *gadget)
1820 struct usb_composite_dev *cdev;
1821 struct gadget_info *gi;
1822 unsigned long flags;
1824 /* the gi->lock is hold by the caller */
1826 cdev = get_gadget_data(gadget);
1827 gi = container_of(cdev, struct gadget_info, cdev);
1828 spin_lock_irqsave(&gi->spinlock, flags);
1830 spin_unlock_irqrestore(&gi->spinlock, flags);
1834 purge_configs_funcs(gi);
1835 composite_dev_cleanup(cdev);
1836 usb_ep_autoconfig_reset(cdev->gadget);
1837 spin_lock_irqsave(&gi->spinlock, flags);
1838 cdev->gadget = NULL;
1839 cdev->deactivations = 0;
1840 gadget->deactivated = false;
1841 set_gadget_data(gadget, NULL);
1842 spin_unlock_irqrestore(&gi->spinlock, flags);
1845 static int configfs_composite_setup(struct usb_gadget *gadget,
1846 const struct usb_ctrlrequest *ctrl)
1848 struct usb_composite_dev *cdev;
1849 struct gadget_info *gi;
1850 unsigned long flags;
1853 cdev = get_gadget_data(gadget);
1857 gi = container_of(cdev, struct gadget_info, cdev);
1858 spin_lock_irqsave(&gi->spinlock, flags);
1859 cdev = get_gadget_data(gadget);
1860 if (!cdev || gi->unbind) {
1861 spin_unlock_irqrestore(&gi->spinlock, flags);
1865 ret = composite_setup(gadget, ctrl);
1866 spin_unlock_irqrestore(&gi->spinlock, flags);
1870 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1872 struct usb_composite_dev *cdev;
1873 struct gadget_info *gi;
1874 unsigned long flags;
1876 cdev = get_gadget_data(gadget);
1880 gi = container_of(cdev, struct gadget_info, cdev);
1881 spin_lock_irqsave(&gi->spinlock, flags);
1882 cdev = get_gadget_data(gadget);
1883 if (!cdev || gi->unbind) {
1884 spin_unlock_irqrestore(&gi->spinlock, flags);
1888 composite_disconnect(gadget);
1889 spin_unlock_irqrestore(&gi->spinlock, flags);
1892 static void configfs_composite_reset(struct usb_gadget *gadget)
1894 struct usb_composite_dev *cdev;
1895 struct gadget_info *gi;
1896 unsigned long flags;
1898 cdev = get_gadget_data(gadget);
1902 gi = container_of(cdev, struct gadget_info, cdev);
1903 spin_lock_irqsave(&gi->spinlock, flags);
1904 cdev = get_gadget_data(gadget);
1905 if (!cdev || gi->unbind) {
1906 spin_unlock_irqrestore(&gi->spinlock, flags);
1910 composite_reset(gadget);
1911 spin_unlock_irqrestore(&gi->spinlock, flags);
1914 static void configfs_composite_suspend(struct usb_gadget *gadget)
1916 struct usb_composite_dev *cdev;
1917 struct gadget_info *gi;
1918 unsigned long flags;
1920 cdev = get_gadget_data(gadget);
1924 gi = container_of(cdev, struct gadget_info, cdev);
1925 spin_lock_irqsave(&gi->spinlock, flags);
1926 cdev = get_gadget_data(gadget);
1927 if (!cdev || gi->unbind) {
1928 spin_unlock_irqrestore(&gi->spinlock, flags);
1932 composite_suspend(gadget);
1933 spin_unlock_irqrestore(&gi->spinlock, flags);
1936 static void configfs_composite_resume(struct usb_gadget *gadget)
1938 struct usb_composite_dev *cdev;
1939 struct gadget_info *gi;
1940 unsigned long flags;
1942 cdev = get_gadget_data(gadget);
1946 gi = container_of(cdev, struct gadget_info, cdev);
1947 spin_lock_irqsave(&gi->spinlock, flags);
1948 cdev = get_gadget_data(gadget);
1949 if (!cdev || gi->unbind) {
1950 spin_unlock_irqrestore(&gi->spinlock, flags);
1954 composite_resume(gadget);
1955 spin_unlock_irqrestore(&gi->spinlock, flags);
1958 static const struct usb_gadget_driver configfs_driver_template = {
1959 .bind = configfs_composite_bind,
1960 .unbind = configfs_composite_unbind,
1962 .setup = configfs_composite_setup,
1963 .reset = configfs_composite_reset,
1964 .disconnect = configfs_composite_disconnect,
1966 .suspend = configfs_composite_suspend,
1967 .resume = configfs_composite_resume,
1969 .max_speed = USB_SPEED_SUPER_PLUS,
1971 .owner = THIS_MODULE,
1973 .match_existing_only = 1,
1976 static struct config_group *gadgets_make(
1977 struct config_group *group,
1980 struct gadget_info *gi;
1982 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1984 return ERR_PTR(-ENOMEM);
1986 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1988 config_group_init_type_name(&gi->functions_group, "functions",
1990 configfs_add_default_group(&gi->functions_group, &gi->group);
1992 config_group_init_type_name(&gi->configs_group, "configs",
1994 configfs_add_default_group(&gi->configs_group, &gi->group);
1996 config_group_init_type_name(&gi->strings_group, "strings",
1997 &gadget_language_strings_type);
1998 configfs_add_default_group(&gi->strings_group, &gi->group);
2000 config_group_init_type_name(&gi->os_desc_group, "os_desc",
2002 configfs_add_default_group(&gi->os_desc_group, &gi->group);
2004 config_group_init_type_name(&gi->webusb_group, "webusb",
2006 configfs_add_default_group(&gi->webusb_group, &gi->group);
2008 gi->composite.bind = configfs_do_nothing;
2009 gi->composite.unbind = configfs_do_nothing;
2010 gi->composite.suspend = NULL;
2011 gi->composite.resume = NULL;
2012 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
2014 spin_lock_init(&gi->spinlock);
2015 mutex_init(&gi->lock);
2016 INIT_LIST_HEAD(&gi->string_list);
2017 INIT_LIST_HEAD(&gi->available_func);
2019 composite_init_dev(&gi->cdev);
2020 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
2021 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
2022 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
2024 gi->composite.gadget_driver = configfs_driver_template;
2026 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
2027 "configfs-gadget.%s", name);
2028 if (!gi->composite.gadget_driver.driver.name)
2031 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
2032 gi->composite.name = gi->composite.gadget_driver.function;
2034 if (!gi->composite.gadget_driver.function)
2035 goto out_free_driver_name;
2039 out_free_driver_name:
2040 kfree(gi->composite.gadget_driver.driver.name);
2043 return ERR_PTR(-ENOMEM);
2046 static void gadgets_drop(struct config_group *group, struct config_item *item)
2048 config_item_put(item);
2051 static struct configfs_group_operations gadgets_ops = {
2052 .make_group = &gadgets_make,
2053 .drop_item = &gadgets_drop,
2056 static const struct config_item_type gadgets_type = {
2057 .ct_group_ops = &gadgets_ops,
2058 .ct_owner = THIS_MODULE,
2061 static struct configfs_subsystem gadget_subsys = {
2064 .ci_namebuf = "usb_gadget",
2065 .ci_type = &gadgets_type,
2068 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
2071 void unregister_gadget_item(struct config_item *item)
2073 struct gadget_info *gi = to_gadget_info(item);
2075 mutex_lock(&gi->lock);
2076 unregister_gadget(gi);
2077 mutex_unlock(&gi->lock);
2079 EXPORT_SYMBOL_GPL(unregister_gadget_item);
2081 static int __init gadget_cfs_init(void)
2085 config_group_init(&gadget_subsys.su_group);
2087 ret = configfs_register_subsystem(&gadget_subsys);
2090 module_init(gadget_cfs_init);
2092 static void __exit gadget_cfs_exit(void)
2094 configfs_unregister_subsystem(&gadget_subsys);
2096 module_exit(gadget_cfs_exit);