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
44 static const struct usb_descriptor_header *otg_desc[2];
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
51 struct config_group os_desc_group;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
67 static inline struct gadget_info *to_gadget_info(struct config_item *item)
69 return container_of(to_config_group(item), struct gadget_info, group);
72 struct config_usb_cfg {
73 struct config_group group;
74 struct config_group strings_group;
75 struct list_head string_list;
76 struct usb_configuration c;
77 struct list_head func_list;
78 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
81 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
83 return container_of(to_config_group(item), struct config_usb_cfg,
87 struct gadget_strings {
88 struct usb_gadget_strings stringtab_dev;
89 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
94 struct config_group group;
95 struct list_head list;
99 struct config_group group;
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_probe_driver(&gi->composite.gadget_driver);
299 gi->composite.gadget_driver.udc_name = NULL;
303 mutex_unlock(&gi->lock);
307 mutex_unlock(&gi->lock);
311 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
312 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
313 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
314 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
315 CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
316 CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
317 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
318 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
319 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
321 static struct configfs_attribute *gadget_root_attrs[] = {
322 &gadget_dev_desc_attr_bDeviceClass,
323 &gadget_dev_desc_attr_bDeviceSubClass,
324 &gadget_dev_desc_attr_bDeviceProtocol,
325 &gadget_dev_desc_attr_bMaxPacketSize0,
326 &gadget_dev_desc_attr_idVendor,
327 &gadget_dev_desc_attr_idProduct,
328 &gadget_dev_desc_attr_bcdDevice,
329 &gadget_dev_desc_attr_bcdUSB,
330 &gadget_dev_desc_attr_UDC,
334 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
336 return container_of(to_config_group(item), struct gadget_strings,
340 static inline struct gadget_config_name *to_gadget_config_name(
341 struct config_item *item)
343 return container_of(to_config_group(item), struct gadget_config_name,
347 static inline struct usb_function_instance *to_usb_function_instance(
348 struct config_item *item)
350 return container_of(to_config_group(item),
351 struct usb_function_instance, group);
354 static void gadget_info_attr_release(struct config_item *item)
356 struct gadget_info *gi = to_gadget_info(item);
358 WARN_ON(!list_empty(&gi->cdev.configs));
359 WARN_ON(!list_empty(&gi->string_list));
360 WARN_ON(!list_empty(&gi->available_func));
361 kfree(gi->composite.gadget_driver.function);
365 static struct configfs_item_operations gadget_root_item_ops = {
366 .release = gadget_info_attr_release,
369 static void gadget_config_attr_release(struct config_item *item)
371 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
373 WARN_ON(!list_empty(&cfg->c.functions));
374 list_del(&cfg->c.list);
379 static int config_usb_cfg_link(
380 struct config_item *usb_cfg_ci,
381 struct config_item *usb_func_ci)
383 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
384 struct usb_composite_dev *cdev = cfg->c.cdev;
385 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
387 struct config_group *group = to_config_group(usb_func_ci);
388 struct usb_function_instance *fi = container_of(group,
389 struct usb_function_instance, group);
390 struct usb_function_instance *a_fi;
391 struct usb_function *f;
394 mutex_lock(&gi->lock);
396 * Make sure this function is from within our _this_ gadget and not
397 * from another gadget or a random directory.
398 * Also a function instance can only be linked once.
400 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
409 list_for_each_entry(f, &cfg->func_list, list) {
416 f = usb_get_function(fi);
422 /* stash the function until we bind it to the gadget */
423 list_add_tail(&f->list, &cfg->func_list);
426 mutex_unlock(&gi->lock);
430 static int config_usb_cfg_unlink(
431 struct config_item *usb_cfg_ci,
432 struct config_item *usb_func_ci)
434 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
435 struct usb_composite_dev *cdev = cfg->c.cdev;
436 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
438 struct config_group *group = to_config_group(usb_func_ci);
439 struct usb_function_instance *fi = container_of(group,
440 struct usb_function_instance, group);
441 struct usb_function *f;
444 * ideally I would like to forbid to unlink functions while a gadget is
445 * bound to an UDC. Since this isn't possible at the moment, we simply
446 * force an unbind, the function is available here and then we can
447 * remove the function.
449 mutex_lock(&gi->lock);
450 if (gi->composite.gadget_driver.udc_name)
451 unregister_gadget(gi);
452 WARN_ON(gi->composite.gadget_driver.udc_name);
454 list_for_each_entry(f, &cfg->func_list, list) {
458 mutex_unlock(&gi->lock);
462 mutex_unlock(&gi->lock);
463 WARN(1, "Unable to locate function to unbind\n");
467 static struct configfs_item_operations gadget_config_item_ops = {
468 .release = gadget_config_attr_release,
469 .allow_link = config_usb_cfg_link,
470 .drop_link = config_usb_cfg_unlink,
474 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
477 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
480 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
481 const char *page, size_t len)
485 ret = kstrtou16(page, 0, &val);
488 if (DIV_ROUND_UP(val, 8) > 0xff)
490 to_config_usb_cfg(item)->c.MaxPower = val;
494 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
497 return sprintf(page, "0x%02x\n",
498 to_config_usb_cfg(item)->c.bmAttributes);
501 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
502 const char *page, size_t len)
506 ret = kstrtou8(page, 0, &val);
509 if (!(val & USB_CONFIG_ATT_ONE))
511 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
512 USB_CONFIG_ATT_WAKEUP))
514 to_config_usb_cfg(item)->c.bmAttributes = val;
518 CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
519 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
521 static struct configfs_attribute *gadget_config_attrs[] = {
522 &gadget_config_desc_attr_MaxPower,
523 &gadget_config_desc_attr_bmAttributes,
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, "%s", 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 GS_STRINGS_RW(gadget_config_name, configuration);
622 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
623 &gadget_config_name_attr_configuration,
627 static void gadget_config_name_attr_release(struct config_item *item)
629 struct gadget_config_name *cn = to_gadget_config_name(item);
631 kfree(cn->configuration);
637 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
638 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
640 static struct config_group *config_desc_make(
641 struct config_group *group,
644 struct gadget_info *gi;
645 struct config_usb_cfg *cfg;
646 char buf[MAX_NAME_LEN];
651 gi = container_of(group, struct gadget_info, configs_group);
652 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
653 if (ret >= MAX_NAME_LEN)
654 return ERR_PTR(-ENAMETOOLONG);
656 num_str = strchr(buf, '.');
658 pr_err("Unable to locate . in name.bConfigurationValue\n");
659 return ERR_PTR(-EINVAL);
666 return ERR_PTR(-EINVAL);
668 ret = kstrtou8(num_str, 0, &num);
672 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
674 return ERR_PTR(-ENOMEM);
675 cfg->c.label = kstrdup(buf, GFP_KERNEL);
680 cfg->c.bConfigurationValue = num;
681 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
682 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
683 INIT_LIST_HEAD(&cfg->string_list);
684 INIT_LIST_HEAD(&cfg->func_list);
686 config_group_init_type_name(&cfg->group, name,
687 &gadget_config_type);
689 config_group_init_type_name(&cfg->strings_group, "strings",
690 &gadget_config_name_strings_type);
691 configfs_add_default_group(&cfg->strings_group, &cfg->group);
693 ret = usb_add_config_only(&gi->cdev, &cfg->c);
704 static void config_desc_drop(
705 struct config_group *group,
706 struct config_item *item)
708 config_item_put(item);
711 static struct configfs_group_operations config_desc_ops = {
712 .make_group = &config_desc_make,
713 .drop_item = &config_desc_drop,
716 static struct config_item_type config_desc_type = {
717 .ct_group_ops = &config_desc_ops,
718 .ct_owner = THIS_MODULE,
721 GS_STRINGS_RW(gadget_strings, manufacturer);
722 GS_STRINGS_RW(gadget_strings, product);
723 GS_STRINGS_RW(gadget_strings, serialnumber);
725 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
726 &gadget_strings_attr_manufacturer,
727 &gadget_strings_attr_product,
728 &gadget_strings_attr_serialnumber,
732 static void gadget_strings_attr_release(struct config_item *item)
734 struct gadget_strings *gs = to_gadget_strings(item);
736 kfree(gs->manufacturer);
738 kfree(gs->serialnumber);
744 USB_CONFIG_STRING_RW_OPS(gadget_strings);
745 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
747 static inline struct os_desc *to_os_desc(struct config_item *item)
749 return container_of(to_config_group(item), struct os_desc, group);
752 static inline struct gadget_info *os_desc_item_to_gadget_info(
753 struct config_item *item)
755 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
758 static ssize_t os_desc_use_show(struct config_item *item, char *page)
760 return sprintf(page, "%d",
761 os_desc_item_to_gadget_info(item)->use_os_desc);
764 static ssize_t os_desc_use_store(struct config_item *item, const char *page,
767 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
771 mutex_lock(&gi->lock);
772 ret = strtobool(page, &use);
774 gi->use_os_desc = use;
777 mutex_unlock(&gi->lock);
782 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
784 return sprintf(page, "%d",
785 os_desc_item_to_gadget_info(item)->b_vendor_code);
788 static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
789 const char *page, size_t len)
791 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
795 mutex_lock(&gi->lock);
796 ret = kstrtou8(page, 0, &b_vendor_code);
798 gi->b_vendor_code = b_vendor_code;
801 mutex_unlock(&gi->lock);
806 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
808 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
810 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
811 return OS_STRING_QW_SIGN_LEN;
814 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
817 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
820 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
821 if (page[l - 1] == '\n')
824 mutex_lock(&gi->lock);
825 res = utf8s_to_utf16s(page, l,
826 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
827 OS_STRING_QW_SIGN_LEN);
830 mutex_unlock(&gi->lock);
835 CONFIGFS_ATTR(os_desc_, use);
836 CONFIGFS_ATTR(os_desc_, b_vendor_code);
837 CONFIGFS_ATTR(os_desc_, qw_sign);
839 static struct configfs_attribute *os_desc_attrs[] = {
841 &os_desc_attr_b_vendor_code,
842 &os_desc_attr_qw_sign,
846 static void os_desc_attr_release(struct config_item *item)
848 struct os_desc *os_desc = to_os_desc(item);
852 static int os_desc_link(struct config_item *os_desc_ci,
853 struct config_item *usb_cfg_ci)
855 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
856 struct gadget_info, os_desc_group);
857 struct usb_composite_dev *cdev = &gi->cdev;
858 struct config_usb_cfg *c_target =
859 container_of(to_config_group(usb_cfg_ci),
860 struct config_usb_cfg, group);
861 struct usb_configuration *c;
864 mutex_lock(&gi->lock);
865 list_for_each_entry(c, &cdev->configs, list) {
866 if (c == &c_target->c)
869 if (c != &c_target->c) {
874 if (cdev->os_desc_config) {
879 cdev->os_desc_config = &c_target->c;
883 mutex_unlock(&gi->lock);
887 static int os_desc_unlink(struct config_item *os_desc_ci,
888 struct config_item *usb_cfg_ci)
890 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
891 struct gadget_info, os_desc_group);
892 struct usb_composite_dev *cdev = &gi->cdev;
894 mutex_lock(&gi->lock);
895 if (gi->composite.gadget_driver.udc_name)
896 unregister_gadget(gi);
897 cdev->os_desc_config = NULL;
898 WARN_ON(gi->composite.gadget_driver.udc_name);
899 mutex_unlock(&gi->lock);
903 static struct configfs_item_operations os_desc_ops = {
904 .release = os_desc_attr_release,
905 .allow_link = os_desc_link,
906 .drop_link = os_desc_unlink,
909 static struct config_item_type os_desc_type = {
910 .ct_item_ops = &os_desc_ops,
911 .ct_attrs = os_desc_attrs,
912 .ct_owner = THIS_MODULE,
915 static inline struct usb_os_desc_ext_prop
916 *to_usb_os_desc_ext_prop(struct config_item *item)
918 return container_of(item, struct usb_os_desc_ext_prop, item);
921 static ssize_t ext_prop_type_show(struct config_item *item, char *page)
923 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
926 static ssize_t ext_prop_type_store(struct config_item *item,
927 const char *page, size_t len)
929 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
930 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
934 if (desc->opts_mutex)
935 mutex_lock(desc->opts_mutex);
936 ret = kstrtou8(page, 0, &type);
939 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
944 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
945 ext_prop->type == USB_EXT_PROP_LE32 ||
946 ext_prop->type == USB_EXT_PROP_BE32) &&
947 (type == USB_EXT_PROP_UNICODE ||
948 type == USB_EXT_PROP_UNICODE_ENV ||
949 type == USB_EXT_PROP_UNICODE_LINK))
950 ext_prop->data_len <<= 1;
951 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
952 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
953 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
954 (type == USB_EXT_PROP_BINARY ||
955 type == USB_EXT_PROP_LE32 ||
956 type == USB_EXT_PROP_BE32))
957 ext_prop->data_len >>= 1;
958 ext_prop->type = type;
962 if (desc->opts_mutex)
963 mutex_unlock(desc->opts_mutex);
967 static ssize_t ext_prop_data_show(struct config_item *item, char *page)
969 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
970 int len = ext_prop->data_len;
972 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
973 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
974 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
976 memcpy(page, ext_prop->data, len);
981 static ssize_t ext_prop_data_store(struct config_item *item,
982 const char *page, size_t len)
984 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
985 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
987 size_t ret_len = len;
989 if (page[len - 1] == '\n' || page[len - 1] == '\0')
991 new_data = kmemdup(page, len, GFP_KERNEL);
995 if (desc->opts_mutex)
996 mutex_lock(desc->opts_mutex);
997 kfree(ext_prop->data);
998 ext_prop->data = new_data;
999 desc->ext_prop_len -= ext_prop->data_len;
1000 ext_prop->data_len = len;
1001 desc->ext_prop_len += ext_prop->data_len;
1002 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1003 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1004 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1005 desc->ext_prop_len -= ext_prop->data_len;
1006 ext_prop->data_len <<= 1;
1007 ext_prop->data_len += 2;
1008 desc->ext_prop_len += ext_prop->data_len;
1010 if (desc->opts_mutex)
1011 mutex_unlock(desc->opts_mutex);
1015 CONFIGFS_ATTR(ext_prop_, type);
1016 CONFIGFS_ATTR(ext_prop_, data);
1018 static struct configfs_attribute *ext_prop_attrs[] = {
1019 &ext_prop_attr_type,
1020 &ext_prop_attr_data,
1024 static void usb_os_desc_ext_prop_release(struct config_item *item)
1026 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1028 kfree(ext_prop); /* frees a whole chunk */
1031 static struct configfs_item_operations ext_prop_ops = {
1032 .release = usb_os_desc_ext_prop_release,
1035 static struct config_item *ext_prop_make(
1036 struct config_group *group,
1039 struct usb_os_desc_ext_prop *ext_prop;
1040 struct config_item_type *ext_prop_type;
1041 struct usb_os_desc *desc;
1044 vla_group(data_chunk);
1045 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1046 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1048 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1050 return ERR_PTR(-ENOMEM);
1052 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1053 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1055 desc = container_of(group, struct usb_os_desc, group);
1056 ext_prop_type->ct_item_ops = &ext_prop_ops;
1057 ext_prop_type->ct_attrs = ext_prop_attrs;
1058 ext_prop_type->ct_owner = desc->owner;
1060 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1062 ext_prop->name = kstrdup(name, GFP_KERNEL);
1063 if (!ext_prop->name) {
1065 return ERR_PTR(-ENOMEM);
1067 desc->ext_prop_len += 14;
1068 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1069 if (desc->opts_mutex)
1070 mutex_lock(desc->opts_mutex);
1071 desc->ext_prop_len += ext_prop->name_len;
1072 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1073 ++desc->ext_prop_count;
1074 if (desc->opts_mutex)
1075 mutex_unlock(desc->opts_mutex);
1077 return &ext_prop->item;
1080 static void ext_prop_drop(struct config_group *group, struct config_item *item)
1082 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1083 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1085 if (desc->opts_mutex)
1086 mutex_lock(desc->opts_mutex);
1087 list_del(&ext_prop->entry);
1088 --desc->ext_prop_count;
1089 kfree(ext_prop->name);
1090 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1091 if (desc->opts_mutex)
1092 mutex_unlock(desc->opts_mutex);
1093 config_item_put(item);
1096 static struct configfs_group_operations interf_grp_ops = {
1097 .make_item = &ext_prop_make,
1098 .drop_item = &ext_prop_drop,
1101 static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1104 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1108 static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1109 const char *page, size_t len)
1111 struct usb_os_desc *desc = to_usb_os_desc(item);
1114 l = min_t(int, 8, len);
1115 if (page[l - 1] == '\n')
1117 if (desc->opts_mutex)
1118 mutex_lock(desc->opts_mutex);
1119 memcpy(desc->ext_compat_id, page, l);
1121 if (desc->opts_mutex)
1122 mutex_unlock(desc->opts_mutex);
1127 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1130 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1134 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1135 const char *page, size_t len)
1137 struct usb_os_desc *desc = to_usb_os_desc(item);
1140 l = min_t(int, 8, len);
1141 if (page[l - 1] == '\n')
1143 if (desc->opts_mutex)
1144 mutex_lock(desc->opts_mutex);
1145 memcpy(desc->ext_compat_id + 8, page, l);
1147 if (desc->opts_mutex)
1148 mutex_unlock(desc->opts_mutex);
1153 CONFIGFS_ATTR(interf_grp_, compatible_id);
1154 CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1156 static struct configfs_attribute *interf_grp_attrs[] = {
1157 &interf_grp_attr_compatible_id,
1158 &interf_grp_attr_sub_compatible_id,
1162 struct config_group *usb_os_desc_prepare_interf_dir(
1163 struct config_group *parent,
1165 struct usb_os_desc **desc,
1167 struct module *owner)
1169 struct config_group *os_desc_group;
1170 struct config_item_type *os_desc_type, *interface_type;
1172 vla_group(data_chunk);
1173 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1174 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1175 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1177 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1179 return ERR_PTR(-ENOMEM);
1181 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1182 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1183 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1185 os_desc_type->ct_owner = owner;
1186 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1187 configfs_add_default_group(os_desc_group, parent);
1189 interface_type->ct_group_ops = &interf_grp_ops;
1190 interface_type->ct_attrs = interf_grp_attrs;
1191 interface_type->ct_owner = owner;
1193 while (n_interf--) {
1194 struct usb_os_desc *d;
1198 config_group_init_type_name(&d->group, "", interface_type);
1199 config_item_set_name(&d->group.cg_item, "interface.%s",
1201 configfs_add_default_group(&d->group, os_desc_group);
1204 return os_desc_group;
1206 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1208 static int configfs_do_nothing(struct usb_composite_dev *cdev)
1214 int composite_dev_prepare(struct usb_composite_driver *composite,
1215 struct usb_composite_dev *dev);
1217 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1218 struct usb_ep *ep0);
1220 static void purge_configs_funcs(struct gadget_info *gi)
1222 struct usb_configuration *c;
1224 list_for_each_entry(c, &gi->cdev.configs, list) {
1225 struct usb_function *f, *tmp;
1226 struct config_usb_cfg *cfg;
1228 cfg = container_of(c, struct config_usb_cfg, c);
1230 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1232 list_move(&f->list, &cfg->func_list);
1234 dev_dbg(&gi->cdev.gadget->dev,
1235 "unbind function '%s'/%p\n",
1240 c->next_interface_id = 0;
1241 memset(c->interface, 0, sizeof(c->interface));
1242 c->superspeed_plus = 0;
1249 static int configfs_composite_bind(struct usb_gadget *gadget,
1250 struct usb_gadget_driver *gdriver)
1252 struct usb_composite_driver *composite = to_cdriver(gdriver);
1253 struct gadget_info *gi = container_of(composite,
1254 struct gadget_info, composite);
1255 struct usb_composite_dev *cdev = &gi->cdev;
1256 struct usb_configuration *c;
1257 struct usb_string *s;
1261 /* the gi->lock is hold by the caller */
1263 cdev->gadget = gadget;
1264 set_gadget_data(gadget, cdev);
1265 ret = composite_dev_prepare(composite, cdev);
1268 /* and now the gadget bind */
1271 if (list_empty(&gi->cdev.configs)) {
1272 pr_err("Need at least one configuration in %s.\n",
1273 gi->composite.name);
1274 goto err_comp_cleanup;
1278 list_for_each_entry(c, &gi->cdev.configs, list) {
1279 struct config_usb_cfg *cfg;
1281 cfg = container_of(c, struct config_usb_cfg, c);
1282 if (list_empty(&cfg->func_list)) {
1283 pr_err("Config %s/%d of %s needs at least one function.\n",
1284 c->label, c->bConfigurationValue,
1285 gi->composite.name);
1286 goto err_comp_cleanup;
1290 /* init all strings */
1291 if (!list_empty(&gi->string_list)) {
1292 struct gadget_strings *gs;
1295 list_for_each_entry(gs, &gi->string_list, list) {
1297 gi->gstrings[i] = &gs->stringtab_dev;
1298 gs->stringtab_dev.strings = gs->strings;
1299 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1301 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1302 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1305 gi->gstrings[i] = NULL;
1306 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1307 USB_GADGET_FIRST_AVAIL_IDX);
1310 goto err_comp_cleanup;
1313 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1314 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1315 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1318 if (gi->use_os_desc) {
1319 cdev->use_os_string = true;
1320 cdev->b_vendor_code = gi->b_vendor_code;
1321 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1324 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1325 struct usb_descriptor_header *usb_desc;
1327 usb_desc = usb_otg_descriptor_alloc(gadget);
1330 goto err_comp_cleanup;
1332 usb_otg_descriptor_init(gadget, usb_desc);
1333 otg_desc[0] = usb_desc;
1337 /* Go through all configs, attach all functions */
1338 list_for_each_entry(c, &gi->cdev.configs, list) {
1339 struct config_usb_cfg *cfg;
1340 struct usb_function *f;
1341 struct usb_function *tmp;
1342 struct gadget_config_name *cn;
1344 if (gadget_is_otg(gadget))
1345 c->descriptors = otg_desc;
1347 cfg = container_of(c, struct config_usb_cfg, c);
1348 if (!list_empty(&cfg->string_list)) {
1350 list_for_each_entry(cn, &cfg->string_list, list) {
1351 cfg->gstrings[i] = &cn->stringtab_dev;
1352 cn->stringtab_dev.strings = &cn->strings;
1353 cn->strings.s = cn->configuration;
1356 cfg->gstrings[i] = NULL;
1357 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1360 goto err_comp_cleanup;
1362 c->iConfiguration = s[0].id;
1365 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1367 ret = usb_add_function(c, f);
1369 list_add(&f->list, &cfg->func_list);
1370 goto err_purge_funcs;
1373 usb_ep_autoconfig_reset(cdev->gadget);
1375 if (cdev->use_os_string) {
1376 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1378 goto err_purge_funcs;
1381 usb_ep_autoconfig_reset(cdev->gadget);
1385 purge_configs_funcs(gi);
1387 composite_dev_cleanup(cdev);
1391 static void configfs_composite_unbind(struct usb_gadget *gadget)
1393 struct usb_composite_dev *cdev;
1394 struct gadget_info *gi;
1395 unsigned long flags;
1397 /* the gi->lock is hold by the caller */
1399 cdev = get_gadget_data(gadget);
1400 gi = container_of(cdev, struct gadget_info, cdev);
1401 spin_lock_irqsave(&gi->spinlock, flags);
1403 spin_unlock_irqrestore(&gi->spinlock, flags);
1407 purge_configs_funcs(gi);
1408 composite_dev_cleanup(cdev);
1409 usb_ep_autoconfig_reset(cdev->gadget);
1410 spin_lock_irqsave(&gi->spinlock, flags);
1411 cdev->gadget = NULL;
1412 set_gadget_data(gadget, NULL);
1413 spin_unlock_irqrestore(&gi->spinlock, flags);
1416 static int configfs_composite_setup(struct usb_gadget *gadget,
1417 const struct usb_ctrlrequest *ctrl)
1419 struct usb_composite_dev *cdev;
1420 struct gadget_info *gi;
1421 unsigned long flags;
1424 cdev = get_gadget_data(gadget);
1428 gi = container_of(cdev, struct gadget_info, cdev);
1429 spin_lock_irqsave(&gi->spinlock, flags);
1430 cdev = get_gadget_data(gadget);
1431 if (!cdev || gi->unbind) {
1432 spin_unlock_irqrestore(&gi->spinlock, flags);
1436 ret = composite_setup(gadget, ctrl);
1437 spin_unlock_irqrestore(&gi->spinlock, flags);
1441 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1443 struct usb_composite_dev *cdev;
1444 struct gadget_info *gi;
1445 unsigned long flags;
1447 cdev = get_gadget_data(gadget);
1451 gi = container_of(cdev, struct gadget_info, cdev);
1452 spin_lock_irqsave(&gi->spinlock, flags);
1453 cdev = get_gadget_data(gadget);
1454 if (!cdev || gi->unbind) {
1455 spin_unlock_irqrestore(&gi->spinlock, flags);
1459 composite_disconnect(gadget);
1460 spin_unlock_irqrestore(&gi->spinlock, flags);
1463 static void configfs_composite_suspend(struct usb_gadget *gadget)
1465 struct usb_composite_dev *cdev;
1466 struct gadget_info *gi;
1467 unsigned long flags;
1469 cdev = get_gadget_data(gadget);
1473 gi = container_of(cdev, struct gadget_info, cdev);
1474 spin_lock_irqsave(&gi->spinlock, flags);
1475 cdev = get_gadget_data(gadget);
1476 if (!cdev || gi->unbind) {
1477 spin_unlock_irqrestore(&gi->spinlock, flags);
1481 composite_suspend(gadget);
1482 spin_unlock_irqrestore(&gi->spinlock, flags);
1485 static void configfs_composite_resume(struct usb_gadget *gadget)
1487 struct usb_composite_dev *cdev;
1488 struct gadget_info *gi;
1489 unsigned long flags;
1491 cdev = get_gadget_data(gadget);
1495 gi = container_of(cdev, struct gadget_info, cdev);
1496 spin_lock_irqsave(&gi->spinlock, flags);
1497 cdev = get_gadget_data(gadget);
1498 if (!cdev || gi->unbind) {
1499 spin_unlock_irqrestore(&gi->spinlock, flags);
1503 composite_resume(gadget);
1504 spin_unlock_irqrestore(&gi->spinlock, flags);
1507 static const struct usb_gadget_driver configfs_driver_template = {
1508 .bind = configfs_composite_bind,
1509 .unbind = configfs_composite_unbind,
1511 .setup = configfs_composite_setup,
1512 .reset = configfs_composite_disconnect,
1513 .disconnect = configfs_composite_disconnect,
1515 .suspend = configfs_composite_suspend,
1516 .resume = configfs_composite_resume,
1518 .max_speed = USB_SPEED_SUPER_PLUS,
1520 .owner = THIS_MODULE,
1521 .name = "configfs-gadget",
1523 .match_existing_only = 1,
1526 static struct config_group *gadgets_make(
1527 struct config_group *group,
1530 struct gadget_info *gi;
1532 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1534 return ERR_PTR(-ENOMEM);
1536 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1538 config_group_init_type_name(&gi->functions_group, "functions",
1540 configfs_add_default_group(&gi->functions_group, &gi->group);
1542 config_group_init_type_name(&gi->configs_group, "configs",
1544 configfs_add_default_group(&gi->configs_group, &gi->group);
1546 config_group_init_type_name(&gi->strings_group, "strings",
1547 &gadget_strings_strings_type);
1548 configfs_add_default_group(&gi->strings_group, &gi->group);
1550 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1552 configfs_add_default_group(&gi->os_desc_group, &gi->group);
1554 gi->composite.bind = configfs_do_nothing;
1555 gi->composite.unbind = configfs_do_nothing;
1556 gi->composite.suspend = NULL;
1557 gi->composite.resume = NULL;
1558 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
1560 spin_lock_init(&gi->spinlock);
1561 mutex_init(&gi->lock);
1562 INIT_LIST_HEAD(&gi->string_list);
1563 INIT_LIST_HEAD(&gi->available_func);
1565 composite_init_dev(&gi->cdev);
1566 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1567 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1568 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1570 gi->composite.gadget_driver = configfs_driver_template;
1572 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1573 gi->composite.name = gi->composite.gadget_driver.function;
1575 if (!gi->composite.gadget_driver.function)
1581 return ERR_PTR(-ENOMEM);
1584 static void gadgets_drop(struct config_group *group, struct config_item *item)
1586 config_item_put(item);
1589 static struct configfs_group_operations gadgets_ops = {
1590 .make_group = &gadgets_make,
1591 .drop_item = &gadgets_drop,
1594 static struct config_item_type gadgets_type = {
1595 .ct_group_ops = &gadgets_ops,
1596 .ct_owner = THIS_MODULE,
1599 static struct configfs_subsystem gadget_subsys = {
1602 .ci_namebuf = "usb_gadget",
1603 .ci_type = &gadgets_type,
1606 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1609 void unregister_gadget_item(struct config_item *item)
1611 struct gadget_info *gi = to_gadget_info(item);
1613 mutex_lock(&gi->lock);
1614 unregister_gadget(gi);
1615 mutex_unlock(&gi->lock);
1617 EXPORT_SYMBOL_GPL(unregister_gadget_item);
1619 static int __init gadget_cfs_init(void)
1623 config_group_init(&gadget_subsys.su_group);
1625 ret = configfs_register_subsystem(&gadget_subsys);
1628 module_init(gadget_cfs_init);
1630 static void __exit gadget_cfs_exit(void)
1632 configfs_unregister_subsystem(&gadget_subsys);
1634 module_exit(gadget_cfs_exit);