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> 7 #include <linux/nls.h> 8 #include <linux/usb/composite.h> 9 #include <linux/usb/func_utils.h> 10 #include <linux/usb/gadget_configfs.h> 11 #include <linux/usb/webusb.h> 12 #include "configfs.h" 13 #include "u_os_desc.h" 14 15 static int check_user_usb_string(const char *name, 16 struct usb_gadget_strings *stringtab_dev) 17 { 18 u16 num; 19 int ret; 20 21 ret = kstrtou16(name, 0, &num); 22 if (ret) 23 return ret; 24 25 if (!usb_validate_langid(num)) 26 return -EINVAL; 27 28 stringtab_dev->language = num; 29 return 0; 30 } 31 32 #define MAX_NAME_LEN 40 33 #define MAX_USB_STRING_LANGS 2 34 35 static const struct usb_descriptor_header *otg_desc[2]; 36 37 struct gadget_info { 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; 44 45 struct mutex lock; 46 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1]; 47 struct list_head string_list; 48 struct list_head available_func; 49 50 struct usb_composite_driver composite; 51 struct usb_composite_dev cdev; 52 bool use_os_desc; 53 char b_vendor_code; 54 char qw_sign[OS_STRING_QW_SIGN_LEN]; 55 bool use_webusb; 56 u16 bcd_webusb_version; 57 u8 b_webusb_vendor_code; 58 char landing_page[WEBUSB_URL_RAW_MAX_LENGTH]; 59 60 spinlock_t spinlock; 61 bool unbind; 62 }; 63 64 static inline struct gadget_info *to_gadget_info(struct config_item *item) 65 { 66 return container_of(to_config_group(item), struct gadget_info, group); 67 } 68 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]; 76 }; 77 78 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item) 79 { 80 return container_of(to_config_group(item), struct config_usb_cfg, 81 group); 82 } 83 84 static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg) 85 { 86 return container_of(cfg->c.cdev, struct gadget_info, cdev); 87 } 88 89 struct gadget_language { 90 struct usb_gadget_strings stringtab_dev; 91 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX]; 92 char *manufacturer; 93 char *product; 94 char *serialnumber; 95 96 struct config_group group; 97 struct list_head list; 98 struct list_head gadget_strings; 99 unsigned int nstrings; 100 }; 101 102 struct gadget_config_name { 103 struct usb_gadget_strings stringtab_dev; 104 struct usb_string strings; 105 char *configuration; 106 107 struct config_group group; 108 struct list_head list; 109 }; 110 111 #define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1) 112 113 static int usb_string_copy(const char *s, char **s_copy) 114 { 115 int ret; 116 char *str; 117 char *copy = *s_copy; 118 119 ret = strlen(s); 120 if (ret > USB_MAX_STRING_LEN) 121 return -EOVERFLOW; 122 if (ret < 1) 123 return -EINVAL; 124 125 if (copy) { 126 str = copy; 127 } else { 128 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL); 129 if (!str) 130 return -ENOMEM; 131 } 132 strcpy(str, s); 133 if (str[ret - 1] == '\n') 134 str[ret - 1] = '\0'; 135 *s_copy = str; 136 return 0; 137 } 138 139 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \ 140 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \ 141 char *page) \ 142 { \ 143 return sprintf(page, "0x%02x\n", \ 144 to_gadget_info(item)->cdev.desc.__name); \ 145 } 146 147 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \ 148 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \ 149 char *page) \ 150 { \ 151 return sprintf(page, "0x%04x\n", \ 152 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \ 153 } 154 155 156 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \ 157 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \ 158 const char *page, size_t len) \ 159 { \ 160 u8 val; \ 161 int ret; \ 162 ret = kstrtou8(page, 0, &val); \ 163 if (ret) \ 164 return ret; \ 165 to_gadget_info(item)->cdev.desc._name = val; \ 166 return len; \ 167 } 168 169 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \ 170 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \ 171 const char *page, size_t len) \ 172 { \ 173 u16 val; \ 174 int ret; \ 175 ret = kstrtou16(page, 0, &val); \ 176 if (ret) \ 177 return ret; \ 178 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \ 179 return len; \ 180 } 181 182 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \ 183 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \ 184 GI_DEVICE_DESC_SIMPLE_W_##_type(_name) 185 186 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB); 187 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8); 188 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8); 189 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8); 190 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8); 191 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16); 192 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16); 193 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice); 194 195 static ssize_t is_valid_bcd(u16 bcd_val) 196 { 197 if ((bcd_val & 0xf) > 9) 198 return -EINVAL; 199 if (((bcd_val >> 4) & 0xf) > 9) 200 return -EINVAL; 201 if (((bcd_val >> 8) & 0xf) > 9) 202 return -EINVAL; 203 if (((bcd_val >> 12) & 0xf) > 9) 204 return -EINVAL; 205 return 0; 206 } 207 208 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item, 209 const char *page, size_t len) 210 { 211 u16 bcdDevice; 212 int ret; 213 214 ret = kstrtou16(page, 0, &bcdDevice); 215 if (ret) 216 return ret; 217 ret = is_valid_bcd(bcdDevice); 218 if (ret) 219 return ret; 220 221 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice); 222 return len; 223 } 224 225 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item, 226 const char *page, size_t len) 227 { 228 u16 bcdUSB; 229 int ret; 230 231 ret = kstrtou16(page, 0, &bcdUSB); 232 if (ret) 233 return ret; 234 ret = is_valid_bcd(bcdUSB); 235 if (ret) 236 return ret; 237 238 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB); 239 return len; 240 } 241 242 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page) 243 { 244 struct gadget_info *gi = to_gadget_info(item); 245 char *udc_name; 246 int ret; 247 248 mutex_lock(&gi->lock); 249 udc_name = gi->composite.gadget_driver.udc_name; 250 ret = sprintf(page, "%s\n", udc_name ?: ""); 251 mutex_unlock(&gi->lock); 252 253 return ret; 254 } 255 256 static int unregister_gadget(struct gadget_info *gi) 257 { 258 int ret; 259 260 if (!gi->composite.gadget_driver.udc_name) 261 return -ENODEV; 262 263 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver); 264 if (ret) 265 return ret; 266 kfree(gi->composite.gadget_driver.udc_name); 267 gi->composite.gadget_driver.udc_name = NULL; 268 return 0; 269 } 270 271 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item, 272 const char *page, size_t len) 273 { 274 struct gadget_info *gi = to_gadget_info(item); 275 char *name; 276 int ret; 277 278 if (strlen(page) < len) 279 return -EOVERFLOW; 280 281 name = kstrdup(page, GFP_KERNEL); 282 if (!name) 283 return -ENOMEM; 284 if (name[len - 1] == '\n') 285 name[len - 1] = '\0'; 286 287 mutex_lock(&gi->lock); 288 289 if (!strlen(name)) { 290 ret = unregister_gadget(gi); 291 if (ret) 292 goto err; 293 kfree(name); 294 } else { 295 if (gi->composite.gadget_driver.udc_name) { 296 ret = -EBUSY; 297 goto err; 298 } 299 gi->composite.gadget_driver.udc_name = name; 300 ret = usb_gadget_register_driver(&gi->composite.gadget_driver); 301 if (ret) { 302 gi->composite.gadget_driver.udc_name = NULL; 303 goto err; 304 } 305 } 306 mutex_unlock(&gi->lock); 307 return len; 308 err: 309 kfree(name); 310 mutex_unlock(&gi->lock); 311 return ret; 312 } 313 314 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item, 315 char *page) 316 { 317 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed; 318 319 return sprintf(page, "%s\n", usb_speed_string(speed)); 320 } 321 322 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item, 323 const char *page, size_t len) 324 { 325 struct gadget_info *gi = to_gadget_info(item); 326 327 mutex_lock(&gi->lock); 328 329 /* Prevent changing of max_speed after the driver is binded */ 330 if (gi->composite.gadget_driver.udc_name) 331 goto err; 332 333 if (strncmp(page, "super-speed-plus", 16) == 0) 334 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 335 else if (strncmp(page, "super-speed", 11) == 0) 336 gi->composite.max_speed = USB_SPEED_SUPER; 337 else if (strncmp(page, "high-speed", 10) == 0) 338 gi->composite.max_speed = USB_SPEED_HIGH; 339 else if (strncmp(page, "full-speed", 10) == 0) 340 gi->composite.max_speed = USB_SPEED_FULL; 341 else if (strncmp(page, "low-speed", 9) == 0) 342 gi->composite.max_speed = USB_SPEED_LOW; 343 else 344 goto err; 345 346 gi->composite.gadget_driver.max_speed = gi->composite.max_speed; 347 348 mutex_unlock(&gi->lock); 349 return len; 350 err: 351 mutex_unlock(&gi->lock); 352 return -EINVAL; 353 } 354 355 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass); 356 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass); 357 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol); 358 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0); 359 CONFIGFS_ATTR(gadget_dev_desc_, idVendor); 360 CONFIGFS_ATTR(gadget_dev_desc_, idProduct); 361 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice); 362 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB); 363 CONFIGFS_ATTR(gadget_dev_desc_, UDC); 364 CONFIGFS_ATTR(gadget_dev_desc_, max_speed); 365 366 static struct configfs_attribute *gadget_root_attrs[] = { 367 &gadget_dev_desc_attr_bDeviceClass, 368 &gadget_dev_desc_attr_bDeviceSubClass, 369 &gadget_dev_desc_attr_bDeviceProtocol, 370 &gadget_dev_desc_attr_bMaxPacketSize0, 371 &gadget_dev_desc_attr_idVendor, 372 &gadget_dev_desc_attr_idProduct, 373 &gadget_dev_desc_attr_bcdDevice, 374 &gadget_dev_desc_attr_bcdUSB, 375 &gadget_dev_desc_attr_UDC, 376 &gadget_dev_desc_attr_max_speed, 377 NULL, 378 }; 379 380 static inline struct gadget_language *to_gadget_language(struct config_item *item) 381 { 382 return container_of(to_config_group(item), struct gadget_language, 383 group); 384 } 385 386 static inline struct gadget_config_name *to_gadget_config_name( 387 struct config_item *item) 388 { 389 return container_of(to_config_group(item), struct gadget_config_name, 390 group); 391 } 392 393 static inline struct usb_function_instance *to_usb_function_instance( 394 struct config_item *item) 395 { 396 return container_of(to_config_group(item), 397 struct usb_function_instance, group); 398 } 399 400 static void gadget_info_attr_release(struct config_item *item) 401 { 402 struct gadget_info *gi = to_gadget_info(item); 403 404 WARN_ON(!list_empty(&gi->cdev.configs)); 405 WARN_ON(!list_empty(&gi->string_list)); 406 WARN_ON(!list_empty(&gi->available_func)); 407 kfree(gi->composite.gadget_driver.function); 408 kfree(gi->composite.gadget_driver.driver.name); 409 kfree(gi); 410 } 411 412 static struct configfs_item_operations gadget_root_item_ops = { 413 .release = gadget_info_attr_release, 414 }; 415 416 static void gadget_config_attr_release(struct config_item *item) 417 { 418 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 419 420 WARN_ON(!list_empty(&cfg->c.functions)); 421 list_del(&cfg->c.list); 422 kfree(cfg->c.label); 423 kfree(cfg); 424 } 425 426 static int config_usb_cfg_link( 427 struct config_item *usb_cfg_ci, 428 struct config_item *usb_func_ci) 429 { 430 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 431 struct gadget_info *gi = cfg_to_gadget_info(cfg); 432 433 struct usb_function_instance *fi = 434 to_usb_function_instance(usb_func_ci); 435 struct usb_function_instance *a_fi = NULL, *iter; 436 struct usb_function *f; 437 int ret; 438 439 mutex_lock(&gi->lock); 440 /* 441 * Make sure this function is from within our _this_ gadget and not 442 * from another gadget or a random directory. 443 * Also a function instance can only be linked once. 444 */ 445 446 if (gi->composite.gadget_driver.udc_name) { 447 ret = -EINVAL; 448 goto out; 449 } 450 451 list_for_each_entry(iter, &gi->available_func, cfs_list) { 452 if (iter != fi) 453 continue; 454 a_fi = iter; 455 break; 456 } 457 if (!a_fi) { 458 ret = -EINVAL; 459 goto out; 460 } 461 462 list_for_each_entry(f, &cfg->func_list, list) { 463 if (f->fi == fi) { 464 ret = -EEXIST; 465 goto out; 466 } 467 } 468 469 f = usb_get_function(fi); 470 if (IS_ERR(f)) { 471 ret = PTR_ERR(f); 472 goto out; 473 } 474 475 /* stash the function until we bind it to the gadget */ 476 list_add_tail(&f->list, &cfg->func_list); 477 ret = 0; 478 out: 479 mutex_unlock(&gi->lock); 480 return ret; 481 } 482 483 static void config_usb_cfg_unlink( 484 struct config_item *usb_cfg_ci, 485 struct config_item *usb_func_ci) 486 { 487 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 488 struct gadget_info *gi = cfg_to_gadget_info(cfg); 489 490 struct usb_function_instance *fi = 491 to_usb_function_instance(usb_func_ci); 492 struct usb_function *f; 493 494 /* 495 * ideally I would like to forbid to unlink functions while a gadget is 496 * bound to an UDC. Since this isn't possible at the moment, we simply 497 * force an unbind, the function is available here and then we can 498 * remove the function. 499 */ 500 mutex_lock(&gi->lock); 501 if (gi->composite.gadget_driver.udc_name) 502 unregister_gadget(gi); 503 WARN_ON(gi->composite.gadget_driver.udc_name); 504 505 list_for_each_entry(f, &cfg->func_list, list) { 506 if (f->fi == fi) { 507 list_del(&f->list); 508 usb_put_function(f); 509 mutex_unlock(&gi->lock); 510 return; 511 } 512 } 513 mutex_unlock(&gi->lock); 514 WARN(1, "Unable to locate function to unbind\n"); 515 } 516 517 static struct configfs_item_operations gadget_config_item_ops = { 518 .release = gadget_config_attr_release, 519 .allow_link = config_usb_cfg_link, 520 .drop_link = config_usb_cfg_unlink, 521 }; 522 523 524 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item, 525 char *page) 526 { 527 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 528 529 return sprintf(page, "%u\n", cfg->c.MaxPower); 530 } 531 532 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item, 533 const char *page, size_t len) 534 { 535 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 536 u16 val; 537 int ret; 538 ret = kstrtou16(page, 0, &val); 539 if (ret) 540 return ret; 541 if (DIV_ROUND_UP(val, 8) > 0xff) 542 return -ERANGE; 543 cfg->c.MaxPower = val; 544 return len; 545 } 546 547 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item, 548 char *page) 549 { 550 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 551 552 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes); 553 } 554 555 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item, 556 const char *page, size_t len) 557 { 558 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 559 u8 val; 560 int ret; 561 ret = kstrtou8(page, 0, &val); 562 if (ret) 563 return ret; 564 if (!(val & USB_CONFIG_ATT_ONE)) 565 return -EINVAL; 566 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER | 567 USB_CONFIG_ATT_WAKEUP)) 568 return -EINVAL; 569 cfg->c.bmAttributes = val; 570 return len; 571 } 572 573 CONFIGFS_ATTR(gadget_config_desc_, MaxPower); 574 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes); 575 576 static struct configfs_attribute *gadget_config_attrs[] = { 577 &gadget_config_desc_attr_MaxPower, 578 &gadget_config_desc_attr_bmAttributes, 579 NULL, 580 }; 581 582 static const struct config_item_type gadget_config_type = { 583 .ct_item_ops = &gadget_config_item_ops, 584 .ct_attrs = gadget_config_attrs, 585 .ct_owner = THIS_MODULE, 586 }; 587 588 static const struct config_item_type gadget_root_type = { 589 .ct_item_ops = &gadget_root_item_ops, 590 .ct_attrs = gadget_root_attrs, 591 .ct_owner = THIS_MODULE, 592 }; 593 594 static void composite_init_dev(struct usb_composite_dev *cdev) 595 { 596 spin_lock_init(&cdev->lock); 597 INIT_LIST_HEAD(&cdev->configs); 598 INIT_LIST_HEAD(&cdev->gstrings); 599 } 600 601 static struct config_group *function_make( 602 struct config_group *group, 603 const char *name) 604 { 605 struct gadget_info *gi; 606 struct usb_function_instance *fi; 607 char buf[MAX_NAME_LEN]; 608 char *func_name; 609 char *instance_name; 610 int ret; 611 612 if (strlen(name) >= MAX_NAME_LEN) 613 return ERR_PTR(-ENAMETOOLONG); 614 615 scnprintf(buf, MAX_NAME_LEN, "%s", name); 616 617 func_name = buf; 618 instance_name = strchr(func_name, '.'); 619 if (!instance_name) { 620 pr_err("Unable to locate . in FUNC.INSTANCE\n"); 621 return ERR_PTR(-EINVAL); 622 } 623 *instance_name = '\0'; 624 instance_name++; 625 626 fi = usb_get_function_instance(func_name); 627 if (IS_ERR(fi)) 628 return ERR_CAST(fi); 629 630 ret = config_item_set_name(&fi->group.cg_item, "%s", name); 631 if (ret) { 632 usb_put_function_instance(fi); 633 return ERR_PTR(ret); 634 } 635 if (fi->set_inst_name) { 636 ret = fi->set_inst_name(fi, instance_name); 637 if (ret) { 638 usb_put_function_instance(fi); 639 return ERR_PTR(ret); 640 } 641 } 642 643 gi = container_of(group, struct gadget_info, functions_group); 644 645 mutex_lock(&gi->lock); 646 list_add_tail(&fi->cfs_list, &gi->available_func); 647 mutex_unlock(&gi->lock); 648 return &fi->group; 649 } 650 651 static void function_drop( 652 struct config_group *group, 653 struct config_item *item) 654 { 655 struct usb_function_instance *fi = to_usb_function_instance(item); 656 struct gadget_info *gi; 657 658 gi = container_of(group, struct gadget_info, functions_group); 659 660 mutex_lock(&gi->lock); 661 list_del(&fi->cfs_list); 662 mutex_unlock(&gi->lock); 663 config_item_put(item); 664 } 665 666 static struct configfs_group_operations functions_ops = { 667 .make_group = &function_make, 668 .drop_item = &function_drop, 669 }; 670 671 static const struct config_item_type functions_type = { 672 .ct_group_ops = &functions_ops, 673 .ct_owner = THIS_MODULE, 674 }; 675 676 GS_STRINGS_RW(gadget_config_name, configuration); 677 678 static struct configfs_attribute *gadget_config_name_langid_attrs[] = { 679 &gadget_config_name_attr_configuration, 680 NULL, 681 }; 682 683 static void gadget_config_name_attr_release(struct config_item *item) 684 { 685 struct gadget_config_name *cn = to_gadget_config_name(item); 686 687 kfree(cn->configuration); 688 689 list_del(&cn->list); 690 kfree(cn); 691 } 692 693 USB_CONFIG_STRING_RW_OPS(gadget_config_name); 694 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg); 695 696 static struct config_group *config_desc_make( 697 struct config_group *group, 698 const char *name) 699 { 700 struct gadget_info *gi; 701 struct config_usb_cfg *cfg; 702 char buf[MAX_NAME_LEN]; 703 char *num_str; 704 u8 num; 705 int ret; 706 707 gi = container_of(group, struct gadget_info, configs_group); 708 709 if (strlen(name) >= MAX_NAME_LEN) 710 return ERR_PTR(-ENAMETOOLONG); 711 712 scnprintf(buf, MAX_NAME_LEN, "%s", name); 713 714 num_str = strchr(buf, '.'); 715 if (!num_str) { 716 pr_err("Unable to locate . in name.bConfigurationValue\n"); 717 return ERR_PTR(-EINVAL); 718 } 719 720 *num_str = '\0'; 721 num_str++; 722 723 if (!strlen(buf)) 724 return ERR_PTR(-EINVAL); 725 726 ret = kstrtou8(num_str, 0, &num); 727 if (ret) 728 return ERR_PTR(ret); 729 730 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 731 if (!cfg) 732 return ERR_PTR(-ENOMEM); 733 cfg->c.label = kstrdup(buf, GFP_KERNEL); 734 if (!cfg->c.label) { 735 ret = -ENOMEM; 736 goto err; 737 } 738 cfg->c.bConfigurationValue = num; 739 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW; 740 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE; 741 INIT_LIST_HEAD(&cfg->string_list); 742 INIT_LIST_HEAD(&cfg->func_list); 743 744 config_group_init_type_name(&cfg->group, name, 745 &gadget_config_type); 746 747 config_group_init_type_name(&cfg->strings_group, "strings", 748 &gadget_config_name_strings_type); 749 configfs_add_default_group(&cfg->strings_group, &cfg->group); 750 751 ret = usb_add_config_only(&gi->cdev, &cfg->c); 752 if (ret) 753 goto err; 754 755 return &cfg->group; 756 err: 757 kfree(cfg->c.label); 758 kfree(cfg); 759 return ERR_PTR(ret); 760 } 761 762 static void config_desc_drop( 763 struct config_group *group, 764 struct config_item *item) 765 { 766 config_item_put(item); 767 } 768 769 static struct configfs_group_operations config_desc_ops = { 770 .make_group = &config_desc_make, 771 .drop_item = &config_desc_drop, 772 }; 773 774 static const struct config_item_type config_desc_type = { 775 .ct_group_ops = &config_desc_ops, 776 .ct_owner = THIS_MODULE, 777 }; 778 779 GS_STRINGS_RW(gadget_language, manufacturer); 780 GS_STRINGS_RW(gadget_language, product); 781 GS_STRINGS_RW(gadget_language, serialnumber); 782 783 static struct configfs_attribute *gadget_language_langid_attrs[] = { 784 &gadget_language_attr_manufacturer, 785 &gadget_language_attr_product, 786 &gadget_language_attr_serialnumber, 787 NULL, 788 }; 789 790 static void gadget_language_attr_release(struct config_item *item) 791 { 792 struct gadget_language *gs = to_gadget_language(item); 793 794 kfree(gs->manufacturer); 795 kfree(gs->product); 796 kfree(gs->serialnumber); 797 798 list_del(&gs->list); 799 kfree(gs); 800 } 801 802 static struct configfs_item_operations gadget_language_langid_item_ops = { 803 .release = gadget_language_attr_release, 804 }; 805 806 static ssize_t gadget_string_id_show(struct config_item *item, char *page) 807 { 808 struct gadget_string *string = to_gadget_string(item); 809 int ret; 810 811 ret = sprintf(page, "%u\n", string->usb_string.id); 812 return ret; 813 } 814 CONFIGFS_ATTR_RO(gadget_string_, id); 815 816 static ssize_t gadget_string_s_show(struct config_item *item, char *page) 817 { 818 struct gadget_string *string = to_gadget_string(item); 819 int ret; 820 821 ret = sysfs_emit(page, "%s\n", string->string); 822 return ret; 823 } 824 825 static ssize_t gadget_string_s_store(struct config_item *item, const char *page, 826 size_t len) 827 { 828 struct gadget_string *string = to_gadget_string(item); 829 int size = min(sizeof(string->string), len + 1); 830 ssize_t cpy_len; 831 832 if (len > USB_MAX_STRING_LEN) 833 return -EINVAL; 834 835 cpy_len = strscpy(string->string, page, size); 836 if (cpy_len > 0 && string->string[cpy_len - 1] == '\n') 837 string->string[cpy_len - 1] = 0; 838 return len; 839 } 840 CONFIGFS_ATTR(gadget_string_, s); 841 842 static struct configfs_attribute *gadget_string_attrs[] = { 843 &gadget_string_attr_id, 844 &gadget_string_attr_s, 845 NULL, 846 }; 847 848 static void gadget_string_release(struct config_item *item) 849 { 850 struct gadget_string *string = to_gadget_string(item); 851 852 kfree(string); 853 } 854 855 static struct configfs_item_operations gadget_string_item_ops = { 856 .release = gadget_string_release, 857 }; 858 859 static const struct config_item_type gadget_string_type = { 860 .ct_item_ops = &gadget_string_item_ops, 861 .ct_attrs = gadget_string_attrs, 862 .ct_owner = THIS_MODULE, 863 }; 864 865 static struct config_item *gadget_language_string_make(struct config_group *group, 866 const char *name) 867 { 868 struct gadget_language *language; 869 struct gadget_string *string; 870 871 language = to_gadget_language(&group->cg_item); 872 873 string = kzalloc(sizeof(*string), GFP_KERNEL); 874 if (!string) 875 return ERR_PTR(-ENOMEM); 876 877 string->usb_string.id = language->nstrings++; 878 string->usb_string.s = string->string; 879 list_add_tail(&string->list, &language->gadget_strings); 880 881 config_item_init_type_name(&string->item, name, &gadget_string_type); 882 883 return &string->item; 884 } 885 886 static void gadget_language_string_drop(struct config_group *group, 887 struct config_item *item) 888 { 889 struct gadget_language *language; 890 struct gadget_string *string; 891 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX; 892 893 language = to_gadget_language(&group->cg_item); 894 string = to_gadget_string(item); 895 896 list_del(&string->list); 897 language->nstrings--; 898 899 /* Reset the ids for the language's strings to guarantee a continuous set */ 900 list_for_each_entry(string, &language->gadget_strings, list) 901 string->usb_string.id = i++; 902 } 903 904 static struct configfs_group_operations gadget_language_langid_group_ops = { 905 .make_item = gadget_language_string_make, 906 .drop_item = gadget_language_string_drop, 907 }; 908 909 static const struct config_item_type gadget_language_type = { 910 .ct_item_ops = &gadget_language_langid_item_ops, 911 .ct_group_ops = &gadget_language_langid_group_ops, 912 .ct_attrs = gadget_language_langid_attrs, 913 .ct_owner = THIS_MODULE, 914 }; 915 916 static struct config_group *gadget_language_make(struct config_group *group, 917 const char *name) 918 { 919 struct gadget_info *gi; 920 struct gadget_language *gs; 921 struct gadget_language *new; 922 int langs = 0; 923 int ret; 924 925 new = kzalloc(sizeof(*new), GFP_KERNEL); 926 if (!new) 927 return ERR_PTR(-ENOMEM); 928 929 ret = check_user_usb_string(name, &new->stringtab_dev); 930 if (ret) 931 goto err; 932 config_group_init_type_name(&new->group, name, 933 &gadget_language_type); 934 935 gi = container_of(group, struct gadget_info, strings_group); 936 ret = -EEXIST; 937 list_for_each_entry(gs, &gi->string_list, list) { 938 if (gs->stringtab_dev.language == new->stringtab_dev.language) 939 goto err; 940 langs++; 941 } 942 ret = -EOVERFLOW; 943 if (langs >= MAX_USB_STRING_LANGS) 944 goto err; 945 946 list_add_tail(&new->list, &gi->string_list); 947 INIT_LIST_HEAD(&new->gadget_strings); 948 949 /* We have the default manufacturer, product and serialnumber strings */ 950 new->nstrings = 3; 951 return &new->group; 952 err: 953 kfree(new); 954 return ERR_PTR(ret); 955 } 956 957 static void gadget_language_drop(struct config_group *group, 958 struct config_item *item) 959 { 960 config_item_put(item); 961 } 962 963 static struct configfs_group_operations gadget_language_group_ops = { 964 .make_group = &gadget_language_make, 965 .drop_item = &gadget_language_drop, 966 }; 967 968 static const struct config_item_type gadget_language_strings_type = { 969 .ct_group_ops = &gadget_language_group_ops, 970 .ct_owner = THIS_MODULE, 971 }; 972 973 static inline struct gadget_info *webusb_item_to_gadget_info( 974 struct config_item *item) 975 { 976 return container_of(to_config_group(item), 977 struct gadget_info, webusb_group); 978 } 979 980 static ssize_t webusb_use_show(struct config_item *item, char *page) 981 { 982 return sysfs_emit(page, "%d\n", 983 webusb_item_to_gadget_info(item)->use_webusb); 984 } 985 986 static ssize_t webusb_use_store(struct config_item *item, const char *page, 987 size_t len) 988 { 989 struct gadget_info *gi = webusb_item_to_gadget_info(item); 990 int ret; 991 bool use; 992 993 ret = kstrtobool(page, &use); 994 if (ret) 995 return ret; 996 997 mutex_lock(&gi->lock); 998 gi->use_webusb = use; 999 mutex_unlock(&gi->lock); 1000 1001 return len; 1002 } 1003 1004 static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page) 1005 { 1006 return sysfs_emit(page, "0x%04x\n", 1007 webusb_item_to_gadget_info(item)->bcd_webusb_version); 1008 } 1009 1010 static ssize_t webusb_bcdVersion_store(struct config_item *item, 1011 const char *page, size_t len) 1012 { 1013 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1014 u16 bcdVersion; 1015 int ret; 1016 1017 ret = kstrtou16(page, 0, &bcdVersion); 1018 if (ret) 1019 return ret; 1020 1021 ret = is_valid_bcd(bcdVersion); 1022 if (ret) 1023 return ret; 1024 1025 mutex_lock(&gi->lock); 1026 gi->bcd_webusb_version = bcdVersion; 1027 mutex_unlock(&gi->lock); 1028 1029 return len; 1030 } 1031 1032 static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page) 1033 { 1034 return sysfs_emit(page, "0x%02x\n", 1035 webusb_item_to_gadget_info(item)->b_webusb_vendor_code); 1036 } 1037 1038 static ssize_t webusb_bVendorCode_store(struct config_item *item, 1039 const char *page, size_t len) 1040 { 1041 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1042 int ret; 1043 u8 b_vendor_code; 1044 1045 ret = kstrtou8(page, 0, &b_vendor_code); 1046 if (ret) 1047 return ret; 1048 1049 mutex_lock(&gi->lock); 1050 gi->b_webusb_vendor_code = b_vendor_code; 1051 mutex_unlock(&gi->lock); 1052 1053 return len; 1054 } 1055 1056 static ssize_t webusb_landingPage_show(struct config_item *item, char *page) 1057 { 1058 return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page); 1059 } 1060 1061 static ssize_t webusb_landingPage_store(struct config_item *item, const char *page, 1062 size_t len) 1063 { 1064 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1065 unsigned int bytes_to_strip = 0; 1066 int l = len; 1067 1068 if (page[l - 1] == '\n') { 1069 --l; 1070 ++bytes_to_strip; 1071 } 1072 1073 if (l > sizeof(gi->landing_page)) { 1074 pr_err("webusb: landingPage URL too long\n"); 1075 return -EINVAL; 1076 } 1077 1078 // validation 1079 if (strncasecmp(page, "https://", 8) == 0) 1080 bytes_to_strip = 8; 1081 else if (strncasecmp(page, "http://", 7) == 0) 1082 bytes_to_strip = 7; 1083 else 1084 bytes_to_strip = 0; 1085 1086 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) { 1087 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n", 1088 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip); 1089 return -EINVAL; 1090 } 1091 1092 mutex_lock(&gi->lock); 1093 // ensure 0 bytes are set, in case the new landing page is shorter then the old one. 1094 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0); 1095 mutex_unlock(&gi->lock); 1096 1097 return len; 1098 } 1099 1100 CONFIGFS_ATTR(webusb_, use); 1101 CONFIGFS_ATTR(webusb_, bVendorCode); 1102 CONFIGFS_ATTR(webusb_, bcdVersion); 1103 CONFIGFS_ATTR(webusb_, landingPage); 1104 1105 static struct configfs_attribute *webusb_attrs[] = { 1106 &webusb_attr_use, 1107 &webusb_attr_bcdVersion, 1108 &webusb_attr_bVendorCode, 1109 &webusb_attr_landingPage, 1110 NULL, 1111 }; 1112 1113 static const struct config_item_type webusb_type = { 1114 .ct_attrs = webusb_attrs, 1115 .ct_owner = THIS_MODULE, 1116 }; 1117 1118 static inline struct gadget_info *os_desc_item_to_gadget_info( 1119 struct config_item *item) 1120 { 1121 return container_of(to_config_group(item), 1122 struct gadget_info, os_desc_group); 1123 } 1124 1125 static ssize_t os_desc_use_show(struct config_item *item, char *page) 1126 { 1127 return sprintf(page, "%d\n", 1128 os_desc_item_to_gadget_info(item)->use_os_desc); 1129 } 1130 1131 static ssize_t os_desc_use_store(struct config_item *item, const char *page, 1132 size_t len) 1133 { 1134 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1135 int ret; 1136 bool use; 1137 1138 ret = kstrtobool(page, &use); 1139 if (ret) 1140 return ret; 1141 1142 mutex_lock(&gi->lock); 1143 gi->use_os_desc = use; 1144 mutex_unlock(&gi->lock); 1145 1146 return len; 1147 } 1148 1149 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 1150 { 1151 return sprintf(page, "0x%02x\n", 1152 os_desc_item_to_gadget_info(item)->b_vendor_code); 1153 } 1154 1155 static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 1156 const char *page, size_t len) 1157 { 1158 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1159 int ret; 1160 u8 b_vendor_code; 1161 1162 ret = kstrtou8(page, 0, &b_vendor_code); 1163 if (ret) 1164 return ret; 1165 1166 mutex_lock(&gi->lock); 1167 gi->b_vendor_code = b_vendor_code; 1168 mutex_unlock(&gi->lock); 1169 1170 return len; 1171 } 1172 1173 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 1174 { 1175 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1176 int res; 1177 1178 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 1179 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 1180 page[res++] = '\n'; 1181 1182 return res; 1183 } 1184 1185 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 1186 size_t len) 1187 { 1188 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1189 int res, l; 1190 1191 l = min_t(int, len, OS_STRING_QW_SIGN_LEN >> 1); 1192 if (page[l - 1] == '\n') 1193 --l; 1194 1195 mutex_lock(&gi->lock); 1196 res = utf8s_to_utf16s(page, l, 1197 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 1198 OS_STRING_QW_SIGN_LEN); 1199 if (res > 0) 1200 res = len; 1201 mutex_unlock(&gi->lock); 1202 1203 return res; 1204 } 1205 1206 CONFIGFS_ATTR(os_desc_, use); 1207 CONFIGFS_ATTR(os_desc_, b_vendor_code); 1208 CONFIGFS_ATTR(os_desc_, qw_sign); 1209 1210 static struct configfs_attribute *os_desc_attrs[] = { 1211 &os_desc_attr_use, 1212 &os_desc_attr_b_vendor_code, 1213 &os_desc_attr_qw_sign, 1214 NULL, 1215 }; 1216 1217 static int os_desc_link(struct config_item *os_desc_ci, 1218 struct config_item *usb_cfg_ci) 1219 { 1220 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1221 struct usb_composite_dev *cdev = &gi->cdev; 1222 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 1223 struct usb_configuration *c = NULL, *iter; 1224 int ret; 1225 1226 mutex_lock(&gi->lock); 1227 list_for_each_entry(iter, &cdev->configs, list) { 1228 if (iter != &c_target->c) 1229 continue; 1230 c = iter; 1231 break; 1232 } 1233 if (!c) { 1234 ret = -EINVAL; 1235 goto out; 1236 } 1237 1238 if (cdev->os_desc_config) { 1239 ret = -EBUSY; 1240 goto out; 1241 } 1242 1243 cdev->os_desc_config = &c_target->c; 1244 ret = 0; 1245 1246 out: 1247 mutex_unlock(&gi->lock); 1248 return ret; 1249 } 1250 1251 static void os_desc_unlink(struct config_item *os_desc_ci, 1252 struct config_item *usb_cfg_ci) 1253 { 1254 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1255 struct usb_composite_dev *cdev = &gi->cdev; 1256 1257 mutex_lock(&gi->lock); 1258 if (gi->composite.gadget_driver.udc_name) 1259 unregister_gadget(gi); 1260 cdev->os_desc_config = NULL; 1261 WARN_ON(gi->composite.gadget_driver.udc_name); 1262 mutex_unlock(&gi->lock); 1263 } 1264 1265 static struct configfs_item_operations os_desc_ops = { 1266 .allow_link = os_desc_link, 1267 .drop_link = os_desc_unlink, 1268 }; 1269 1270 static const struct config_item_type os_desc_type = { 1271 .ct_item_ops = &os_desc_ops, 1272 .ct_attrs = os_desc_attrs, 1273 .ct_owner = THIS_MODULE, 1274 }; 1275 1276 static inline struct usb_os_desc_ext_prop 1277 *to_usb_os_desc_ext_prop(struct config_item *item) 1278 { 1279 return container_of(item, struct usb_os_desc_ext_prop, item); 1280 } 1281 1282 static ssize_t ext_prop_type_show(struct config_item *item, char *page) 1283 { 1284 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 1285 } 1286 1287 static ssize_t ext_prop_type_store(struct config_item *item, 1288 const char *page, size_t len) 1289 { 1290 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1291 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1292 u8 type; 1293 int ret; 1294 1295 ret = kstrtou8(page, 0, &type); 1296 if (ret) 1297 return ret; 1298 1299 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) 1300 return -EINVAL; 1301 1302 if (desc->opts_mutex) 1303 mutex_lock(desc->opts_mutex); 1304 1305 if ((ext_prop->type == USB_EXT_PROP_BINARY || 1306 ext_prop->type == USB_EXT_PROP_LE32 || 1307 ext_prop->type == USB_EXT_PROP_BE32) && 1308 (type == USB_EXT_PROP_UNICODE || 1309 type == USB_EXT_PROP_UNICODE_ENV || 1310 type == USB_EXT_PROP_UNICODE_LINK)) 1311 ext_prop->data_len <<= 1; 1312 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 1313 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1314 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 1315 (type == USB_EXT_PROP_BINARY || 1316 type == USB_EXT_PROP_LE32 || 1317 type == USB_EXT_PROP_BE32)) 1318 ext_prop->data_len >>= 1; 1319 ext_prop->type = type; 1320 1321 if (desc->opts_mutex) 1322 mutex_unlock(desc->opts_mutex); 1323 return len; 1324 } 1325 1326 static ssize_t ext_prop_data_show(struct config_item *item, char *page) 1327 { 1328 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1329 int len = ext_prop->data_len; 1330 1331 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1332 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1333 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1334 len >>= 1; 1335 memcpy(page, ext_prop->data, len); 1336 1337 return len; 1338 } 1339 1340 static ssize_t ext_prop_data_store(struct config_item *item, 1341 const char *page, size_t len) 1342 { 1343 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1344 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1345 char *new_data; 1346 size_t ret_len = len; 1347 1348 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1349 --len; 1350 new_data = kmemdup(page, len, GFP_KERNEL); 1351 if (!new_data) 1352 return -ENOMEM; 1353 1354 if (desc->opts_mutex) 1355 mutex_lock(desc->opts_mutex); 1356 kfree(ext_prop->data); 1357 ext_prop->data = new_data; 1358 desc->ext_prop_len -= ext_prop->data_len; 1359 ext_prop->data_len = len; 1360 desc->ext_prop_len += ext_prop->data_len; 1361 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1362 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1363 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1364 desc->ext_prop_len -= ext_prop->data_len; 1365 ext_prop->data_len <<= 1; 1366 ext_prop->data_len += 2; 1367 desc->ext_prop_len += ext_prop->data_len; 1368 } 1369 if (desc->opts_mutex) 1370 mutex_unlock(desc->opts_mutex); 1371 return ret_len; 1372 } 1373 1374 CONFIGFS_ATTR(ext_prop_, type); 1375 CONFIGFS_ATTR(ext_prop_, data); 1376 1377 static struct configfs_attribute *ext_prop_attrs[] = { 1378 &ext_prop_attr_type, 1379 &ext_prop_attr_data, 1380 NULL, 1381 }; 1382 1383 static void usb_os_desc_ext_prop_release(struct config_item *item) 1384 { 1385 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1386 1387 kfree(ext_prop); /* frees a whole chunk */ 1388 } 1389 1390 static struct configfs_item_operations ext_prop_ops = { 1391 .release = usb_os_desc_ext_prop_release, 1392 }; 1393 1394 static struct config_item *ext_prop_make( 1395 struct config_group *group, 1396 const char *name) 1397 { 1398 struct usb_os_desc_ext_prop *ext_prop; 1399 struct config_item_type *ext_prop_type; 1400 struct usb_os_desc *desc; 1401 char *vlabuf; 1402 1403 vla_group(data_chunk); 1404 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1405 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1406 1407 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1408 if (!vlabuf) 1409 return ERR_PTR(-ENOMEM); 1410 1411 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1412 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1413 1414 desc = container_of(group, struct usb_os_desc, group); 1415 ext_prop_type->ct_item_ops = &ext_prop_ops; 1416 ext_prop_type->ct_attrs = ext_prop_attrs; 1417 ext_prop_type->ct_owner = desc->owner; 1418 1419 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1420 1421 ext_prop->name = kstrdup(name, GFP_KERNEL); 1422 if (!ext_prop->name) { 1423 kfree(vlabuf); 1424 return ERR_PTR(-ENOMEM); 1425 } 1426 desc->ext_prop_len += 14; 1427 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1428 if (desc->opts_mutex) 1429 mutex_lock(desc->opts_mutex); 1430 desc->ext_prop_len += ext_prop->name_len; 1431 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1432 ++desc->ext_prop_count; 1433 if (desc->opts_mutex) 1434 mutex_unlock(desc->opts_mutex); 1435 1436 return &ext_prop->item; 1437 } 1438 1439 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1440 { 1441 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1442 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1443 1444 if (desc->opts_mutex) 1445 mutex_lock(desc->opts_mutex); 1446 list_del(&ext_prop->entry); 1447 --desc->ext_prop_count; 1448 kfree(ext_prop->name); 1449 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1450 if (desc->opts_mutex) 1451 mutex_unlock(desc->opts_mutex); 1452 config_item_put(item); 1453 } 1454 1455 static struct configfs_group_operations interf_grp_ops = { 1456 .make_item = &ext_prop_make, 1457 .drop_item = &ext_prop_drop, 1458 }; 1459 1460 static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1461 char *page) 1462 { 1463 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1464 return 8; 1465 } 1466 1467 static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1468 const char *page, size_t len) 1469 { 1470 struct usb_os_desc *desc = to_usb_os_desc(item); 1471 int l; 1472 1473 l = min_t(int, 8, len); 1474 if (page[l - 1] == '\n') 1475 --l; 1476 if (desc->opts_mutex) 1477 mutex_lock(desc->opts_mutex); 1478 memcpy(desc->ext_compat_id, page, l); 1479 1480 if (desc->opts_mutex) 1481 mutex_unlock(desc->opts_mutex); 1482 1483 return len; 1484 } 1485 1486 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1487 char *page) 1488 { 1489 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1490 return 8; 1491 } 1492 1493 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1494 const char *page, size_t len) 1495 { 1496 struct usb_os_desc *desc = to_usb_os_desc(item); 1497 int l; 1498 1499 l = min_t(int, 8, len); 1500 if (page[l - 1] == '\n') 1501 --l; 1502 if (desc->opts_mutex) 1503 mutex_lock(desc->opts_mutex); 1504 memcpy(desc->ext_compat_id + 8, page, l); 1505 1506 if (desc->opts_mutex) 1507 mutex_unlock(desc->opts_mutex); 1508 1509 return len; 1510 } 1511 1512 CONFIGFS_ATTR(interf_grp_, compatible_id); 1513 CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1514 1515 static struct configfs_attribute *interf_grp_attrs[] = { 1516 &interf_grp_attr_compatible_id, 1517 &interf_grp_attr_sub_compatible_id, 1518 NULL 1519 }; 1520 1521 struct config_group *usb_os_desc_prepare_interf_dir( 1522 struct config_group *parent, 1523 int n_interf, 1524 struct usb_os_desc **desc, 1525 char **names, 1526 struct module *owner) 1527 { 1528 struct config_group *os_desc_group; 1529 struct config_item_type *os_desc_type, *interface_type; 1530 1531 vla_group(data_chunk); 1532 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1533 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1534 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1535 1536 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1537 if (!vlabuf) 1538 return ERR_PTR(-ENOMEM); 1539 1540 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1541 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1542 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1543 1544 os_desc_type->ct_owner = owner; 1545 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1546 configfs_add_default_group(os_desc_group, parent); 1547 1548 interface_type->ct_group_ops = &interf_grp_ops; 1549 interface_type->ct_attrs = interf_grp_attrs; 1550 interface_type->ct_owner = owner; 1551 1552 while (n_interf--) { 1553 struct usb_os_desc *d; 1554 1555 d = desc[n_interf]; 1556 d->owner = owner; 1557 config_group_init_type_name(&d->group, "", interface_type); 1558 config_item_set_name(&d->group.cg_item, "interface.%s", 1559 names[n_interf]); 1560 configfs_add_default_group(&d->group, os_desc_group); 1561 } 1562 1563 return os_desc_group; 1564 } 1565 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1566 1567 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1568 { 1569 WARN_ON(1); 1570 return -EINVAL; 1571 } 1572 1573 int composite_dev_prepare(struct usb_composite_driver *composite, 1574 struct usb_composite_dev *dev); 1575 1576 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1577 struct usb_ep *ep0); 1578 1579 static void purge_configs_funcs(struct gadget_info *gi) 1580 { 1581 struct usb_configuration *c; 1582 1583 list_for_each_entry(c, &gi->cdev.configs, list) { 1584 struct usb_function *f, *tmp; 1585 struct config_usb_cfg *cfg; 1586 1587 cfg = container_of(c, struct config_usb_cfg, c); 1588 1589 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1590 1591 list_move(&f->list, &cfg->func_list); 1592 if (f->unbind) { 1593 dev_dbg(&gi->cdev.gadget->dev, 1594 "unbind function '%s'/%p\n", 1595 f->name, f); 1596 f->unbind(c, f); 1597 } 1598 } 1599 c->next_interface_id = 0; 1600 memset(c->interface, 0, sizeof(c->interface)); 1601 c->superspeed_plus = 0; 1602 c->superspeed = 0; 1603 c->highspeed = 0; 1604 c->fullspeed = 0; 1605 } 1606 } 1607 1608 static struct usb_string * 1609 configfs_attach_gadget_strings(struct gadget_info *gi) 1610 { 1611 struct usb_gadget_strings **gadget_strings; 1612 struct gadget_language *language; 1613 struct gadget_string *string; 1614 unsigned int nlangs = 0; 1615 struct list_head *iter; 1616 struct usb_string *us; 1617 unsigned int i = 0; 1618 int nstrings = -1; 1619 unsigned int j; 1620 1621 list_for_each(iter, &gi->string_list) 1622 nlangs++; 1623 1624 /* Bail out early if no languages are configured */ 1625 if (!nlangs) 1626 return NULL; 1627 1628 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */ 1629 sizeof(struct usb_gadget_strings *), GFP_KERNEL); 1630 if (!gadget_strings) 1631 return ERR_PTR(-ENOMEM); 1632 1633 list_for_each_entry(language, &gi->string_list, list) { 1634 struct usb_string *stringtab; 1635 1636 if (nstrings == -1) { 1637 nstrings = language->nstrings; 1638 } else if (nstrings != language->nstrings) { 1639 pr_err("languages must contain the same number of strings\n"); 1640 us = ERR_PTR(-EINVAL); 1641 goto cleanup; 1642 } 1643 1644 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string), 1645 GFP_KERNEL); 1646 if (!stringtab) { 1647 us = ERR_PTR(-ENOMEM); 1648 goto cleanup; 1649 } 1650 1651 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX; 1652 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer; 1653 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX; 1654 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product; 1655 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX; 1656 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber; 1657 1658 j = USB_GADGET_FIRST_AVAIL_IDX; 1659 list_for_each_entry(string, &language->gadget_strings, list) { 1660 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string)); 1661 j++; 1662 } 1663 1664 language->stringtab_dev.strings = stringtab; 1665 gadget_strings[i] = &language->stringtab_dev; 1666 i++; 1667 } 1668 1669 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings); 1670 1671 cleanup: 1672 list_for_each_entry(language, &gi->string_list, list) { 1673 kfree(language->stringtab_dev.strings); 1674 language->stringtab_dev.strings = NULL; 1675 } 1676 1677 kfree(gadget_strings); 1678 1679 return us; 1680 } 1681 1682 static int configfs_composite_bind(struct usb_gadget *gadget, 1683 struct usb_gadget_driver *gdriver) 1684 { 1685 struct usb_composite_driver *composite = to_cdriver(gdriver); 1686 struct gadget_info *gi = container_of(composite, 1687 struct gadget_info, composite); 1688 struct usb_composite_dev *cdev = &gi->cdev; 1689 struct usb_configuration *c; 1690 struct usb_string *s; 1691 unsigned i; 1692 int ret; 1693 1694 /* the gi->lock is hold by the caller */ 1695 gi->unbind = 0; 1696 cdev->gadget = gadget; 1697 set_gadget_data(gadget, cdev); 1698 ret = composite_dev_prepare(composite, cdev); 1699 if (ret) 1700 return ret; 1701 /* and now the gadget bind */ 1702 ret = -EINVAL; 1703 1704 if (list_empty(&gi->cdev.configs)) { 1705 pr_err("Need at least one configuration in %s.\n", 1706 gi->composite.name); 1707 goto err_comp_cleanup; 1708 } 1709 1710 1711 list_for_each_entry(c, &gi->cdev.configs, list) { 1712 struct config_usb_cfg *cfg; 1713 1714 cfg = container_of(c, struct config_usb_cfg, c); 1715 if (list_empty(&cfg->func_list)) { 1716 pr_err("Config %s/%d of %s needs at least one function.\n", 1717 c->label, c->bConfigurationValue, 1718 gi->composite.name); 1719 goto err_comp_cleanup; 1720 } 1721 } 1722 1723 /* init all strings */ 1724 if (!list_empty(&gi->string_list)) { 1725 s = configfs_attach_gadget_strings(gi); 1726 if (IS_ERR(s)) { 1727 ret = PTR_ERR(s); 1728 goto err_comp_cleanup; 1729 } 1730 1731 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1732 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1733 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1734 1735 gi->cdev.usb_strings = s; 1736 } 1737 1738 if (gi->use_webusb) { 1739 cdev->use_webusb = true; 1740 cdev->bcd_webusb_version = gi->bcd_webusb_version; 1741 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code; 1742 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH); 1743 } 1744 1745 if (gi->use_os_desc) { 1746 cdev->use_os_string = true; 1747 cdev->b_vendor_code = gi->b_vendor_code; 1748 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1749 } 1750 1751 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1752 struct usb_descriptor_header *usb_desc; 1753 1754 usb_desc = usb_otg_descriptor_alloc(gadget); 1755 if (!usb_desc) { 1756 ret = -ENOMEM; 1757 goto err_comp_cleanup; 1758 } 1759 usb_otg_descriptor_init(gadget, usb_desc); 1760 otg_desc[0] = usb_desc; 1761 otg_desc[1] = NULL; 1762 } 1763 1764 /* Go through all configs, attach all functions */ 1765 list_for_each_entry(c, &gi->cdev.configs, list) { 1766 struct config_usb_cfg *cfg; 1767 struct usb_function *f; 1768 struct usb_function *tmp; 1769 struct gadget_config_name *cn; 1770 1771 if (gadget_is_otg(gadget)) 1772 c->descriptors = otg_desc; 1773 1774 /* Properly configure the bmAttributes wakeup bit */ 1775 check_remote_wakeup_config(gadget, c); 1776 1777 cfg = container_of(c, struct config_usb_cfg, c); 1778 if (!list_empty(&cfg->string_list)) { 1779 i = 0; 1780 list_for_each_entry(cn, &cfg->string_list, list) { 1781 cfg->gstrings[i] = &cn->stringtab_dev; 1782 cn->stringtab_dev.strings = &cn->strings; 1783 cn->strings.s = cn->configuration; 1784 i++; 1785 } 1786 cfg->gstrings[i] = NULL; 1787 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1788 if (IS_ERR(s)) { 1789 ret = PTR_ERR(s); 1790 goto err_comp_cleanup; 1791 } 1792 c->iConfiguration = s[0].id; 1793 } 1794 1795 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1796 list_del(&f->list); 1797 ret = usb_add_function(c, f); 1798 if (ret) { 1799 list_add(&f->list, &cfg->func_list); 1800 goto err_purge_funcs; 1801 } 1802 } 1803 ret = usb_gadget_check_config(cdev->gadget); 1804 if (ret) 1805 goto err_purge_funcs; 1806 1807 usb_ep_autoconfig_reset(cdev->gadget); 1808 } 1809 if (cdev->use_os_string) { 1810 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1811 if (ret) 1812 goto err_purge_funcs; 1813 } 1814 1815 usb_ep_autoconfig_reset(cdev->gadget); 1816 return 0; 1817 1818 err_purge_funcs: 1819 purge_configs_funcs(gi); 1820 err_comp_cleanup: 1821 composite_dev_cleanup(cdev); 1822 return ret; 1823 } 1824 1825 static void configfs_composite_unbind(struct usb_gadget *gadget) 1826 { 1827 struct usb_composite_dev *cdev; 1828 struct gadget_info *gi; 1829 unsigned long flags; 1830 1831 /* the gi->lock is hold by the caller */ 1832 1833 cdev = get_gadget_data(gadget); 1834 gi = container_of(cdev, struct gadget_info, cdev); 1835 spin_lock_irqsave(&gi->spinlock, flags); 1836 gi->unbind = 1; 1837 spin_unlock_irqrestore(&gi->spinlock, flags); 1838 1839 kfree(otg_desc[0]); 1840 otg_desc[0] = NULL; 1841 purge_configs_funcs(gi); 1842 composite_dev_cleanup(cdev); 1843 usb_ep_autoconfig_reset(cdev->gadget); 1844 spin_lock_irqsave(&gi->spinlock, flags); 1845 cdev->gadget = NULL; 1846 cdev->deactivations = 0; 1847 gadget->deactivated = false; 1848 set_gadget_data(gadget, NULL); 1849 spin_unlock_irqrestore(&gi->spinlock, flags); 1850 } 1851 1852 static int configfs_composite_setup(struct usb_gadget *gadget, 1853 const struct usb_ctrlrequest *ctrl) 1854 { 1855 struct usb_composite_dev *cdev; 1856 struct gadget_info *gi; 1857 unsigned long flags; 1858 int ret; 1859 1860 cdev = get_gadget_data(gadget); 1861 if (!cdev) 1862 return 0; 1863 1864 gi = container_of(cdev, struct gadget_info, cdev); 1865 spin_lock_irqsave(&gi->spinlock, flags); 1866 cdev = get_gadget_data(gadget); 1867 if (!cdev || gi->unbind) { 1868 spin_unlock_irqrestore(&gi->spinlock, flags); 1869 return 0; 1870 } 1871 1872 ret = composite_setup(gadget, ctrl); 1873 spin_unlock_irqrestore(&gi->spinlock, flags); 1874 return ret; 1875 } 1876 1877 static void configfs_composite_disconnect(struct usb_gadget *gadget) 1878 { 1879 struct usb_composite_dev *cdev; 1880 struct gadget_info *gi; 1881 unsigned long flags; 1882 1883 cdev = get_gadget_data(gadget); 1884 if (!cdev) 1885 return; 1886 1887 gi = container_of(cdev, struct gadget_info, cdev); 1888 spin_lock_irqsave(&gi->spinlock, flags); 1889 cdev = get_gadget_data(gadget); 1890 if (!cdev || gi->unbind) { 1891 spin_unlock_irqrestore(&gi->spinlock, flags); 1892 return; 1893 } 1894 1895 composite_disconnect(gadget); 1896 spin_unlock_irqrestore(&gi->spinlock, flags); 1897 } 1898 1899 static void configfs_composite_reset(struct usb_gadget *gadget) 1900 { 1901 struct usb_composite_dev *cdev; 1902 struct gadget_info *gi; 1903 unsigned long flags; 1904 1905 cdev = get_gadget_data(gadget); 1906 if (!cdev) 1907 return; 1908 1909 gi = container_of(cdev, struct gadget_info, cdev); 1910 spin_lock_irqsave(&gi->spinlock, flags); 1911 cdev = get_gadget_data(gadget); 1912 if (!cdev || gi->unbind) { 1913 spin_unlock_irqrestore(&gi->spinlock, flags); 1914 return; 1915 } 1916 1917 composite_reset(gadget); 1918 spin_unlock_irqrestore(&gi->spinlock, flags); 1919 } 1920 1921 static void configfs_composite_suspend(struct usb_gadget *gadget) 1922 { 1923 struct usb_composite_dev *cdev; 1924 struct gadget_info *gi; 1925 unsigned long flags; 1926 1927 cdev = get_gadget_data(gadget); 1928 if (!cdev) 1929 return; 1930 1931 gi = container_of(cdev, struct gadget_info, cdev); 1932 spin_lock_irqsave(&gi->spinlock, flags); 1933 cdev = get_gadget_data(gadget); 1934 if (!cdev || gi->unbind) { 1935 spin_unlock_irqrestore(&gi->spinlock, flags); 1936 return; 1937 } 1938 1939 composite_suspend(gadget); 1940 spin_unlock_irqrestore(&gi->spinlock, flags); 1941 } 1942 1943 static void configfs_composite_resume(struct usb_gadget *gadget) 1944 { 1945 struct usb_composite_dev *cdev; 1946 struct gadget_info *gi; 1947 unsigned long flags; 1948 1949 cdev = get_gadget_data(gadget); 1950 if (!cdev) 1951 return; 1952 1953 gi = container_of(cdev, struct gadget_info, cdev); 1954 spin_lock_irqsave(&gi->spinlock, flags); 1955 cdev = get_gadget_data(gadget); 1956 if (!cdev || gi->unbind) { 1957 spin_unlock_irqrestore(&gi->spinlock, flags); 1958 return; 1959 } 1960 1961 composite_resume(gadget); 1962 spin_unlock_irqrestore(&gi->spinlock, flags); 1963 } 1964 1965 static const struct usb_gadget_driver configfs_driver_template = { 1966 .bind = configfs_composite_bind, 1967 .unbind = configfs_composite_unbind, 1968 1969 .setup = configfs_composite_setup, 1970 .reset = configfs_composite_reset, 1971 .disconnect = configfs_composite_disconnect, 1972 1973 .suspend = configfs_composite_suspend, 1974 .resume = configfs_composite_resume, 1975 1976 .max_speed = USB_SPEED_SUPER_PLUS, 1977 .driver = { 1978 .owner = THIS_MODULE, 1979 }, 1980 .match_existing_only = 1, 1981 }; 1982 1983 static struct config_group *gadgets_make( 1984 struct config_group *group, 1985 const char *name) 1986 { 1987 struct gadget_info *gi; 1988 1989 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1990 if (!gi) 1991 return ERR_PTR(-ENOMEM); 1992 1993 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1994 1995 config_group_init_type_name(&gi->functions_group, "functions", 1996 &functions_type); 1997 configfs_add_default_group(&gi->functions_group, &gi->group); 1998 1999 config_group_init_type_name(&gi->configs_group, "configs", 2000 &config_desc_type); 2001 configfs_add_default_group(&gi->configs_group, &gi->group); 2002 2003 config_group_init_type_name(&gi->strings_group, "strings", 2004 &gadget_language_strings_type); 2005 configfs_add_default_group(&gi->strings_group, &gi->group); 2006 2007 config_group_init_type_name(&gi->os_desc_group, "os_desc", 2008 &os_desc_type); 2009 configfs_add_default_group(&gi->os_desc_group, &gi->group); 2010 2011 config_group_init_type_name(&gi->webusb_group, "webusb", 2012 &webusb_type); 2013 configfs_add_default_group(&gi->webusb_group, &gi->group); 2014 2015 gi->composite.bind = configfs_do_nothing; 2016 gi->composite.unbind = configfs_do_nothing; 2017 gi->composite.suspend = NULL; 2018 gi->composite.resume = NULL; 2019 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 2020 2021 spin_lock_init(&gi->spinlock); 2022 mutex_init(&gi->lock); 2023 INIT_LIST_HEAD(&gi->string_list); 2024 INIT_LIST_HEAD(&gi->available_func); 2025 2026 composite_init_dev(&gi->cdev); 2027 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 2028 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 2029 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 2030 2031 gi->composite.gadget_driver = configfs_driver_template; 2032 2033 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL, 2034 "configfs-gadget.%s", name); 2035 if (!gi->composite.gadget_driver.driver.name) 2036 goto err; 2037 2038 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 2039 gi->composite.name = gi->composite.gadget_driver.function; 2040 2041 if (!gi->composite.gadget_driver.function) 2042 goto out_free_driver_name; 2043 2044 return &gi->group; 2045 2046 out_free_driver_name: 2047 kfree(gi->composite.gadget_driver.driver.name); 2048 err: 2049 kfree(gi); 2050 return ERR_PTR(-ENOMEM); 2051 } 2052 2053 static void gadgets_drop(struct config_group *group, struct config_item *item) 2054 { 2055 config_item_put(item); 2056 } 2057 2058 static struct configfs_group_operations gadgets_ops = { 2059 .make_group = &gadgets_make, 2060 .drop_item = &gadgets_drop, 2061 }; 2062 2063 static const struct config_item_type gadgets_type = { 2064 .ct_group_ops = &gadgets_ops, 2065 .ct_owner = THIS_MODULE, 2066 }; 2067 2068 static struct configfs_subsystem gadget_subsys = { 2069 .su_group = { 2070 .cg_item = { 2071 .ci_namebuf = "usb_gadget", 2072 .ci_type = &gadgets_type, 2073 }, 2074 }, 2075 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 2076 }; 2077 2078 void unregister_gadget_item(struct config_item *item) 2079 { 2080 struct gadget_info *gi = to_gadget_info(item); 2081 2082 mutex_lock(&gi->lock); 2083 unregister_gadget(gi); 2084 mutex_unlock(&gi->lock); 2085 } 2086 EXPORT_SYMBOL_GPL(unregister_gadget_item); 2087 2088 static int __init gadget_cfs_init(void) 2089 { 2090 int ret; 2091 2092 config_group_init(&gadget_subsys.su_group); 2093 2094 ret = configfs_register_subsystem(&gadget_subsys); 2095 return ret; 2096 } 2097 module_init(gadget_cfs_init); 2098 2099 static void __exit gadget_cfs_exit(void) 2100 { 2101 configfs_unregister_subsystem(&gadget_subsys); 2102 } 2103 module_exit(gadget_cfs_exit); 2104