1 #include <linux/configfs.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/device.h>
5 #include <linux/usb/composite.h>
6 #include <linux/usb/gadget_configfs.h>
8 int check_user_usb_string(const char *name,
9 struct usb_gadget_strings *stringtab_dev)
11 unsigned primary_lang;
16 ret = kstrtou16(name, 0, &num);
20 primary_lang = num & 0x3ff;
23 /* simple sanity check for valid langid */
24 switch (primary_lang) {
33 stringtab_dev->language = num;
37 #define MAX_NAME_LEN 40
38 #define MAX_USB_STRING_LANGS 2
41 struct config_group group;
42 struct config_group functions_group;
43 struct config_group configs_group;
44 struct config_group strings_group;
45 struct config_group *default_groups[4];
48 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
49 struct list_head string_list;
50 struct list_head available_func;
54 struct usb_otg_descriptor otg;
56 struct usb_composite_driver composite;
57 struct usb_composite_dev cdev;
60 struct config_usb_cfg {
61 struct config_group group;
62 struct config_group strings_group;
63 struct config_group *default_groups[2];
64 struct list_head string_list;
65 struct usb_configuration c;
66 struct list_head func_list;
67 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
70 struct gadget_strings {
71 struct usb_gadget_strings stringtab_dev;
72 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
77 struct config_group group;
78 struct list_head list;
81 struct gadget_config_name {
82 struct usb_gadget_strings stringtab_dev;
83 struct usb_string strings;
86 struct config_group group;
87 struct list_head list;
90 static int usb_string_copy(const char *s, char **s_copy)
99 str = kstrdup(s, GFP_KERNEL);
102 if (str[ret - 1] == '\n')
109 CONFIGFS_ATTR_STRUCT(gadget_info);
110 CONFIGFS_ATTR_STRUCT(config_usb_cfg);
112 #define GI_DEVICE_DESC_ITEM_ATTR(name) \
113 static struct gadget_info_attribute gadget_cdev_desc_##name = \
114 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
115 gadget_dev_desc_##name##_show, \
116 gadget_dev_desc_##name##_store)
118 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
119 static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
122 return sprintf(page, "0x%02x\n", gi->cdev.desc.__name); \
125 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
126 static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
129 return sprintf(page, "0x%04x\n", le16_to_cpup(&gi->cdev.desc.__name)); \
133 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
134 static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
135 const char *page, size_t len) \
139 ret = kstrtou8(page, 0, &val); \
142 gi->cdev.desc._name = val; \
146 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
147 static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
148 const char *page, size_t len) \
152 ret = kstrtou16(page, 0, &val); \
155 gi->cdev.desc._name = cpu_to_le16p(&val); \
159 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
160 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
161 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
163 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
164 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
165 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
166 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
167 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
168 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
169 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
170 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
172 static ssize_t is_valid_bcd(u16 bcd_val)
174 if ((bcd_val & 0xf) > 9)
176 if (((bcd_val >> 4) & 0xf) > 9)
178 if (((bcd_val >> 8) & 0xf) > 9)
180 if (((bcd_val >> 12) & 0xf) > 9)
185 static ssize_t gadget_dev_desc_bcdDevice_store(struct gadget_info *gi,
186 const char *page, size_t len)
191 ret = kstrtou16(page, 0, &bcdDevice);
194 ret = is_valid_bcd(bcdDevice);
198 gi->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
202 static ssize_t gadget_dev_desc_bcdUSB_store(struct gadget_info *gi,
203 const char *page, size_t len)
208 ret = kstrtou16(page, 0, &bcdUSB);
211 ret = is_valid_bcd(bcdUSB);
215 gi->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
219 static ssize_t gadget_dev_desc_UDC_show(struct gadget_info *gi, char *page)
221 return sprintf(page, "%s\n", gi->udc_name ?: "");
224 static int unregister_gadget(struct gadget_info *gi)
231 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
239 static ssize_t gadget_dev_desc_UDC_store(struct gadget_info *gi,
240 const char *page, size_t len)
245 name = kstrdup(page, GFP_KERNEL);
248 if (name[len - 1] == '\n')
249 name[len - 1] = '\0';
251 mutex_lock(&gi->lock);
254 ret = unregister_gadget(gi);
262 ret = udc_attach_driver(name, &gi->composite.gadget_driver);
267 mutex_unlock(&gi->lock);
271 mutex_unlock(&gi->lock);
275 GI_DEVICE_DESC_ITEM_ATTR(bDeviceClass);
276 GI_DEVICE_DESC_ITEM_ATTR(bDeviceSubClass);
277 GI_DEVICE_DESC_ITEM_ATTR(bDeviceProtocol);
278 GI_DEVICE_DESC_ITEM_ATTR(bMaxPacketSize0);
279 GI_DEVICE_DESC_ITEM_ATTR(idVendor);
280 GI_DEVICE_DESC_ITEM_ATTR(idProduct);
281 GI_DEVICE_DESC_ITEM_ATTR(bcdDevice);
282 GI_DEVICE_DESC_ITEM_ATTR(bcdUSB);
283 GI_DEVICE_DESC_ITEM_ATTR(UDC);
285 static struct configfs_attribute *gadget_root_attrs[] = {
286 &gadget_cdev_desc_bDeviceClass.attr,
287 &gadget_cdev_desc_bDeviceSubClass.attr,
288 &gadget_cdev_desc_bDeviceProtocol.attr,
289 &gadget_cdev_desc_bMaxPacketSize0.attr,
290 &gadget_cdev_desc_idVendor.attr,
291 &gadget_cdev_desc_idProduct.attr,
292 &gadget_cdev_desc_bcdDevice.attr,
293 &gadget_cdev_desc_bcdUSB.attr,
294 &gadget_cdev_desc_UDC.attr,
298 static inline struct gadget_info *to_gadget_info(struct config_item *item)
300 return container_of(to_config_group(item), struct gadget_info, group);
303 static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
305 return container_of(to_config_group(item), struct gadget_strings,
309 static inline struct gadget_config_name *to_gadget_config_name(
310 struct config_item *item)
312 return container_of(to_config_group(item), struct gadget_config_name,
316 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
318 return container_of(to_config_group(item), struct config_usb_cfg,
322 static inline struct usb_function_instance *to_usb_function_instance(
323 struct config_item *item)
325 return container_of(to_config_group(item),
326 struct usb_function_instance, group);
329 static void gadget_info_attr_release(struct config_item *item)
331 struct gadget_info *gi = to_gadget_info(item);
333 WARN_ON(!list_empty(&gi->cdev.configs));
334 WARN_ON(!list_empty(&gi->string_list));
335 WARN_ON(!list_empty(&gi->available_func));
336 kfree(gi->composite.gadget_driver.function);
340 CONFIGFS_ATTR_OPS(gadget_info);
342 static struct configfs_item_operations gadget_root_item_ops = {
343 .release = gadget_info_attr_release,
344 .show_attribute = gadget_info_attr_show,
345 .store_attribute = gadget_info_attr_store,
348 static void gadget_config_attr_release(struct config_item *item)
350 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
352 WARN_ON(!list_empty(&cfg->c.functions));
353 list_del(&cfg->c.list);
358 static int config_usb_cfg_link(
359 struct config_item *usb_cfg_ci,
360 struct config_item *usb_func_ci)
362 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
363 struct usb_composite_dev *cdev = cfg->c.cdev;
364 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
366 struct config_group *group = to_config_group(usb_func_ci);
367 struct usb_function_instance *fi = container_of(group,
368 struct usb_function_instance, group);
369 struct usb_function_instance *a_fi;
370 struct usb_function *f;
373 mutex_lock(&gi->lock);
375 * Make sure this function is from within our _this_ gadget and not
376 * from another gadget or a random directory.
377 * Also a function instance can only be linked once.
379 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
388 list_for_each_entry(f, &cfg->func_list, list) {
395 f = usb_get_function(fi);
401 /* stash the function until we bind it to the gadget */
402 list_add_tail(&f->list, &cfg->func_list);
405 mutex_unlock(&gi->lock);
409 static int config_usb_cfg_unlink(
410 struct config_item *usb_cfg_ci,
411 struct config_item *usb_func_ci)
413 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
414 struct usb_composite_dev *cdev = cfg->c.cdev;
415 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
417 struct config_group *group = to_config_group(usb_func_ci);
418 struct usb_function_instance *fi = container_of(group,
419 struct usb_function_instance, group);
420 struct usb_function *f;
423 * ideally I would like to forbid to unlink functions while a gadget is
424 * bound to an UDC. Since this isn't possible at the moment, we simply
425 * force an unbind, the function is available here and then we can
426 * remove the function.
428 mutex_lock(&gi->lock);
430 unregister_gadget(gi);
431 WARN_ON(gi->udc_name);
433 list_for_each_entry(f, &cfg->func_list, list) {
437 mutex_unlock(&gi->lock);
441 mutex_unlock(&gi->lock);
442 WARN(1, "Unable to locate function to unbind\n");
446 CONFIGFS_ATTR_OPS(config_usb_cfg);
448 static struct configfs_item_operations gadget_config_item_ops = {
449 .release = gadget_config_attr_release,
450 .show_attribute = config_usb_cfg_attr_show,
451 .store_attribute = config_usb_cfg_attr_store,
452 .allow_link = config_usb_cfg_link,
453 .drop_link = config_usb_cfg_unlink,
457 static ssize_t gadget_config_desc_MaxPower_show(struct config_usb_cfg *cfg,
460 return sprintf(page, "%u\n", cfg->c.MaxPower);
463 static ssize_t gadget_config_desc_MaxPower_store(struct config_usb_cfg *cfg,
464 const char *page, size_t len)
468 ret = kstrtou16(page, 0, &val);
471 if (DIV_ROUND_UP(val, 8) > 0xff)
473 cfg->c.MaxPower = val;
477 static ssize_t gadget_config_desc_bmAttributes_show(struct config_usb_cfg *cfg,
480 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
483 static ssize_t gadget_config_desc_bmAttributes_store(struct config_usb_cfg *cfg,
484 const char *page, size_t len)
488 ret = kstrtou8(page, 0, &val);
491 if (!(val & USB_CONFIG_ATT_ONE))
493 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
494 USB_CONFIG_ATT_WAKEUP))
496 cfg->c.bmAttributes = val;
500 #define CFG_CONFIG_DESC_ITEM_ATTR(name) \
501 static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \
502 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
503 gadget_config_desc_##name##_show, \
504 gadget_config_desc_##name##_store)
506 CFG_CONFIG_DESC_ITEM_ATTR(MaxPower);
507 CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes);
509 static struct configfs_attribute *gadget_config_attrs[] = {
510 &gadget_usb_cfg_MaxPower.attr,
511 &gadget_usb_cfg_bmAttributes.attr,
515 static struct config_item_type gadget_config_type = {
516 .ct_item_ops = &gadget_config_item_ops,
517 .ct_attrs = gadget_config_attrs,
518 .ct_owner = THIS_MODULE,
521 static struct config_item_type gadget_root_type = {
522 .ct_item_ops = &gadget_root_item_ops,
523 .ct_attrs = gadget_root_attrs,
524 .ct_owner = THIS_MODULE,
527 static void composite_init_dev(struct usb_composite_dev *cdev)
529 spin_lock_init(&cdev->lock);
530 INIT_LIST_HEAD(&cdev->configs);
531 INIT_LIST_HEAD(&cdev->gstrings);
534 static struct config_group *function_make(
535 struct config_group *group,
538 struct gadget_info *gi;
539 struct usb_function_instance *fi;
540 char buf[MAX_NAME_LEN];
545 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
546 if (ret >= MAX_NAME_LEN)
547 return ERR_PTR(-ENAMETOOLONG);
550 instance_name = strchr(func_name, '.');
551 if (!instance_name) {
552 pr_err("Unable to locate . in FUNC.INSTANCE\n");
553 return ERR_PTR(-EINVAL);
555 *instance_name = '\0';
558 fi = usb_get_function_instance(func_name);
562 ret = config_item_set_name(&fi->group.cg_item, name);
564 usb_put_function_instance(fi);
568 gi = container_of(group, struct gadget_info, functions_group);
570 mutex_lock(&gi->lock);
571 list_add_tail(&fi->cfs_list, &gi->available_func);
572 mutex_unlock(&gi->lock);
576 static void function_drop(
577 struct config_group *group,
578 struct config_item *item)
580 struct usb_function_instance *fi = to_usb_function_instance(item);
581 struct gadget_info *gi;
583 gi = container_of(group, struct gadget_info, functions_group);
585 mutex_lock(&gi->lock);
586 list_del(&fi->cfs_list);
587 mutex_unlock(&gi->lock);
588 config_item_put(item);
591 static struct configfs_group_operations functions_ops = {
592 .make_group = &function_make,
593 .drop_item = &function_drop,
596 static struct config_item_type functions_type = {
597 .ct_group_ops = &functions_ops,
598 .ct_owner = THIS_MODULE,
601 CONFIGFS_ATTR_STRUCT(gadget_config_name);
602 GS_STRINGS_RW(gadget_config_name, configuration);
604 static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
605 &gadget_config_name_configuration.attr,
609 static void gadget_config_name_attr_release(struct config_item *item)
611 struct gadget_config_name *cn = to_gadget_config_name(item);
613 kfree(cn->configuration);
619 USB_CONFIG_STRING_RW_OPS(gadget_config_name);
620 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
622 static struct config_group *config_desc_make(
623 struct config_group *group,
626 struct gadget_info *gi;
627 struct config_usb_cfg *cfg;
628 char buf[MAX_NAME_LEN];
633 gi = container_of(group, struct gadget_info, configs_group);
634 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
635 if (ret >= MAX_NAME_LEN)
636 return ERR_PTR(-ENAMETOOLONG);
638 num_str = strchr(buf, '.');
640 pr_err("Unable to locate . in name.bConfigurationValue\n");
641 return ERR_PTR(-EINVAL);
648 return ERR_PTR(-EINVAL);
650 ret = kstrtou8(num_str, 0, &num);
654 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
656 return ERR_PTR(-ENOMEM);
657 cfg->c.label = kstrdup(buf, GFP_KERNEL);
662 cfg->c.bConfigurationValue = num;
663 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
664 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
665 INIT_LIST_HEAD(&cfg->string_list);
666 INIT_LIST_HEAD(&cfg->func_list);
668 cfg->group.default_groups = cfg->default_groups;
669 cfg->default_groups[0] = &cfg->strings_group;
671 config_group_init_type_name(&cfg->group, name,
672 &gadget_config_type);
673 config_group_init_type_name(&cfg->strings_group, "strings",
674 &gadget_config_name_strings_type);
676 ret = usb_add_config_only(&gi->cdev, &cfg->c);
687 static void config_desc_drop(
688 struct config_group *group,
689 struct config_item *item)
691 config_item_put(item);
694 static struct configfs_group_operations config_desc_ops = {
695 .make_group = &config_desc_make,
696 .drop_item = &config_desc_drop,
699 static struct config_item_type config_desc_type = {
700 .ct_group_ops = &config_desc_ops,
701 .ct_owner = THIS_MODULE,
704 CONFIGFS_ATTR_STRUCT(gadget_strings);
705 GS_STRINGS_RW(gadget_strings, manufacturer);
706 GS_STRINGS_RW(gadget_strings, product);
707 GS_STRINGS_RW(gadget_strings, serialnumber);
709 static struct configfs_attribute *gadget_strings_langid_attrs[] = {
710 &gadget_strings_manufacturer.attr,
711 &gadget_strings_product.attr,
712 &gadget_strings_serialnumber.attr,
716 static void gadget_strings_attr_release(struct config_item *item)
718 struct gadget_strings *gs = to_gadget_strings(item);
720 kfree(gs->manufacturer);
722 kfree(gs->serialnumber);
728 USB_CONFIG_STRING_RW_OPS(gadget_strings);
729 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
731 static int configfs_do_nothing(struct usb_composite_dev *cdev)
737 int composite_dev_prepare(struct usb_composite_driver *composite,
738 struct usb_composite_dev *dev);
740 static void purge_configs_funcs(struct gadget_info *gi)
742 struct usb_configuration *c;
744 list_for_each_entry(c, &gi->cdev.configs, list) {
745 struct usb_function *f, *tmp;
746 struct config_usb_cfg *cfg;
748 cfg = container_of(c, struct config_usb_cfg, c);
750 list_for_each_entry_safe(f, tmp, &c->functions, list) {
752 list_move_tail(&f->list, &cfg->func_list);
754 dev_err(&gi->cdev.gadget->dev, "unbind function"
755 " '%s'/%p\n", f->name, f);
759 c->next_interface_id = 0;
766 static int configfs_composite_bind(struct usb_gadget *gadget,
767 struct usb_gadget_driver *gdriver)
769 struct usb_composite_driver *composite = to_cdriver(gdriver);
770 struct gadget_info *gi = container_of(composite,
771 struct gadget_info, composite);
772 struct usb_composite_dev *cdev = &gi->cdev;
773 struct usb_configuration *c;
774 struct usb_string *s;
778 /* the gi->lock is hold by the caller */
779 cdev->gadget = gadget;
780 set_gadget_data(gadget, cdev);
781 ret = composite_dev_prepare(composite, cdev);
784 /* and now the gadget bind */
787 if (list_empty(&gi->cdev.configs)) {
788 pr_err("Need atleast one configuration in %s.\n",
790 goto err_comp_cleanup;
794 list_for_each_entry(c, &gi->cdev.configs, list) {
795 struct config_usb_cfg *cfg;
797 cfg = container_of(c, struct config_usb_cfg, c);
798 if (list_empty(&cfg->func_list)) {
799 pr_err("Config %s/%d of %s needs atleast one function.\n",
800 c->label, c->bConfigurationValue,
802 goto err_comp_cleanup;
806 /* init all strings */
807 if (!list_empty(&gi->string_list)) {
808 struct gadget_strings *gs;
811 list_for_each_entry(gs, &gi->string_list, list) {
813 gi->gstrings[i] = &gs->stringtab_dev;
814 gs->stringtab_dev.strings = gs->strings;
815 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
817 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
818 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
821 gi->gstrings[i] = NULL;
822 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
823 USB_GADGET_FIRST_AVAIL_IDX);
826 goto err_comp_cleanup;
829 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
830 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
831 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
834 /* Go through all configs, attach all functions */
835 list_for_each_entry(c, &gi->cdev.configs, list) {
836 struct config_usb_cfg *cfg;
837 struct usb_function *f;
838 struct usb_function *tmp;
839 struct gadget_config_name *cn;
841 cfg = container_of(c, struct config_usb_cfg, c);
842 if (!list_empty(&cfg->string_list)) {
844 list_for_each_entry(cn, &cfg->string_list, list) {
845 cfg->gstrings[i] = &cn->stringtab_dev;
846 cn->stringtab_dev.strings = &cn->strings;
847 cn->strings.s = cn->configuration;
850 cfg->gstrings[i] = NULL;
851 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
854 goto err_comp_cleanup;
856 c->iConfiguration = s[0].id;
859 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
861 ret = usb_add_function(c, f);
863 list_add(&f->list, &cfg->func_list);
864 goto err_purge_funcs;
867 usb_ep_autoconfig_reset(cdev->gadget);
869 usb_ep_autoconfig_reset(cdev->gadget);
873 purge_configs_funcs(gi);
875 composite_dev_cleanup(cdev);
879 static void configfs_composite_unbind(struct usb_gadget *gadget)
881 struct usb_composite_dev *cdev;
882 struct gadget_info *gi;
884 /* the gi->lock is hold by the caller */
886 cdev = get_gadget_data(gadget);
887 gi = container_of(cdev, struct gadget_info, cdev);
889 purge_configs_funcs(gi);
890 composite_dev_cleanup(cdev);
891 usb_ep_autoconfig_reset(cdev->gadget);
893 set_gadget_data(gadget, NULL);
896 static const struct usb_gadget_driver configfs_driver_template = {
897 .bind = configfs_composite_bind,
898 .unbind = configfs_composite_unbind,
900 .setup = composite_setup,
901 .disconnect = composite_disconnect,
903 .max_speed = USB_SPEED_SUPER,
905 .owner = THIS_MODULE,
906 .name = "configfs-gadget",
910 static struct config_group *gadgets_make(
911 struct config_group *group,
914 struct gadget_info *gi;
916 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
918 return ERR_PTR(-ENOMEM);
920 gi->group.default_groups = gi->default_groups;
921 gi->group.default_groups[0] = &gi->functions_group;
922 gi->group.default_groups[1] = &gi->configs_group;
923 gi->group.default_groups[2] = &gi->strings_group;
925 config_group_init_type_name(&gi->functions_group, "functions",
927 config_group_init_type_name(&gi->configs_group, "configs",
929 config_group_init_type_name(&gi->strings_group, "strings",
930 &gadget_strings_strings_type);
932 gi->composite.bind = configfs_do_nothing;
933 gi->composite.unbind = configfs_do_nothing;
934 gi->composite.suspend = NULL;
935 gi->composite.resume = NULL;
936 gi->composite.max_speed = USB_SPEED_SUPER;
938 mutex_init(&gi->lock);
939 INIT_LIST_HEAD(&gi->string_list);
940 INIT_LIST_HEAD(&gi->available_func);
942 composite_init_dev(&gi->cdev);
943 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
944 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
945 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
947 gi->composite.gadget_driver = configfs_driver_template;
949 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
950 gi->composite.name = gi->composite.gadget_driver.function;
952 if (!gi->composite.gadget_driver.function)
955 #ifdef CONFIG_USB_OTG
956 gi->otg.bLength = sizeof(struct usb_otg_descriptor);
957 gi->otg.bDescriptorType = USB_DT_OTG;
958 gi->otg.bmAttributes = USB_OTG_SRP | USB_OTG_HNP;
961 config_group_init_type_name(&gi->group, name,
966 return ERR_PTR(-ENOMEM);
969 static void gadgets_drop(struct config_group *group, struct config_item *item)
971 config_item_put(item);
974 static struct configfs_group_operations gadgets_ops = {
975 .make_group = &gadgets_make,
976 .drop_item = &gadgets_drop,
979 static struct config_item_type gadgets_type = {
980 .ct_group_ops = &gadgets_ops,
981 .ct_owner = THIS_MODULE,
984 static struct configfs_subsystem gadget_subsys = {
987 .ci_namebuf = "usb_gadget",
988 .ci_type = &gadgets_type,
991 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
994 void unregister_gadget_item(struct config_item *item)
996 struct gadget_info *gi = to_gadget_info(item);
998 unregister_gadget(gi);
1000 EXPORT_SYMBOL(unregister_gadget_item);
1002 static int __init gadget_cfs_init(void)
1006 config_group_init(&gadget_subsys.su_group);
1008 ret = configfs_register_subsystem(&gadget_subsys);
1011 module_init(gadget_cfs_init);
1013 static void __exit gadget_cfs_exit(void)
1015 configfs_unregister_subsystem(&gadget_subsys);
1017 module_exit(gadget_cfs_exit);