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 (!len) 1069 return len; 1070 if (page[l - 1] == '\n') { 1071 --l; 1072 ++bytes_to_strip; 1073 } 1074 1075 if (l > sizeof(gi->landing_page)) { 1076 pr_err("webusb: landingPage URL too long\n"); 1077 return -EINVAL; 1078 } 1079 1080 // validation 1081 if (strncasecmp(page, "https://", 8) == 0) 1082 bytes_to_strip = 8; 1083 else if (strncasecmp(page, "http://", 7) == 0) 1084 bytes_to_strip = 7; 1085 else 1086 bytes_to_strip = 0; 1087 1088 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) { 1089 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n", 1090 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip); 1091 return -EINVAL; 1092 } 1093 1094 mutex_lock(&gi->lock); 1095 // ensure 0 bytes are set, in case the new landing page is shorter then the old one. 1096 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0); 1097 mutex_unlock(&gi->lock); 1098 1099 return len; 1100 } 1101 1102 CONFIGFS_ATTR(webusb_, use); 1103 CONFIGFS_ATTR(webusb_, bVendorCode); 1104 CONFIGFS_ATTR(webusb_, bcdVersion); 1105 CONFIGFS_ATTR(webusb_, landingPage); 1106 1107 static struct configfs_attribute *webusb_attrs[] = { 1108 &webusb_attr_use, 1109 &webusb_attr_bcdVersion, 1110 &webusb_attr_bVendorCode, 1111 &webusb_attr_landingPage, 1112 NULL, 1113 }; 1114 1115 static const struct config_item_type webusb_type = { 1116 .ct_attrs = webusb_attrs, 1117 .ct_owner = THIS_MODULE, 1118 }; 1119 1120 static inline struct gadget_info *os_desc_item_to_gadget_info( 1121 struct config_item *item) 1122 { 1123 return container_of(to_config_group(item), 1124 struct gadget_info, os_desc_group); 1125 } 1126 1127 static ssize_t os_desc_use_show(struct config_item *item, char *page) 1128 { 1129 return sprintf(page, "%d\n", 1130 os_desc_item_to_gadget_info(item)->use_os_desc); 1131 } 1132 1133 static ssize_t os_desc_use_store(struct config_item *item, const char *page, 1134 size_t len) 1135 { 1136 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1137 int ret; 1138 bool use; 1139 1140 ret = kstrtobool(page, &use); 1141 if (ret) 1142 return ret; 1143 1144 mutex_lock(&gi->lock); 1145 gi->use_os_desc = use; 1146 mutex_unlock(&gi->lock); 1147 1148 return len; 1149 } 1150 1151 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 1152 { 1153 return sprintf(page, "0x%02x\n", 1154 os_desc_item_to_gadget_info(item)->b_vendor_code); 1155 } 1156 1157 static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 1158 const char *page, size_t len) 1159 { 1160 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1161 int ret; 1162 u8 b_vendor_code; 1163 1164 ret = kstrtou8(page, 0, &b_vendor_code); 1165 if (ret) 1166 return ret; 1167 1168 mutex_lock(&gi->lock); 1169 gi->b_vendor_code = b_vendor_code; 1170 mutex_unlock(&gi->lock); 1171 1172 return len; 1173 } 1174 1175 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 1176 { 1177 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1178 int res; 1179 1180 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 1181 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 1182 page[res++] = '\n'; 1183 1184 return res; 1185 } 1186 1187 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 1188 size_t len) 1189 { 1190 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1191 int res, l; 1192 1193 if (!len) 1194 return len; 1195 l = min_t(int, len, OS_STRING_QW_SIGN_LEN >> 1); 1196 if (page[l - 1] == '\n') 1197 --l; 1198 1199 mutex_lock(&gi->lock); 1200 res = utf8s_to_utf16s(page, l, 1201 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 1202 OS_STRING_QW_SIGN_LEN); 1203 if (res > 0) 1204 res = len; 1205 mutex_unlock(&gi->lock); 1206 1207 return res; 1208 } 1209 1210 CONFIGFS_ATTR(os_desc_, use); 1211 CONFIGFS_ATTR(os_desc_, b_vendor_code); 1212 CONFIGFS_ATTR(os_desc_, qw_sign); 1213 1214 static struct configfs_attribute *os_desc_attrs[] = { 1215 &os_desc_attr_use, 1216 &os_desc_attr_b_vendor_code, 1217 &os_desc_attr_qw_sign, 1218 NULL, 1219 }; 1220 1221 static int os_desc_link(struct config_item *os_desc_ci, 1222 struct config_item *usb_cfg_ci) 1223 { 1224 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1225 struct usb_composite_dev *cdev = &gi->cdev; 1226 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 1227 struct usb_configuration *c = NULL, *iter; 1228 int ret; 1229 1230 mutex_lock(&gi->lock); 1231 list_for_each_entry(iter, &cdev->configs, list) { 1232 if (iter != &c_target->c) 1233 continue; 1234 c = iter; 1235 break; 1236 } 1237 if (!c) { 1238 ret = -EINVAL; 1239 goto out; 1240 } 1241 1242 if (cdev->os_desc_config) { 1243 ret = -EBUSY; 1244 goto out; 1245 } 1246 1247 cdev->os_desc_config = &c_target->c; 1248 ret = 0; 1249 1250 out: 1251 mutex_unlock(&gi->lock); 1252 return ret; 1253 } 1254 1255 static void os_desc_unlink(struct config_item *os_desc_ci, 1256 struct config_item *usb_cfg_ci) 1257 { 1258 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1259 struct usb_composite_dev *cdev = &gi->cdev; 1260 1261 mutex_lock(&gi->lock); 1262 if (gi->composite.gadget_driver.udc_name) 1263 unregister_gadget(gi); 1264 cdev->os_desc_config = NULL; 1265 WARN_ON(gi->composite.gadget_driver.udc_name); 1266 mutex_unlock(&gi->lock); 1267 } 1268 1269 static struct configfs_item_operations os_desc_ops = { 1270 .allow_link = os_desc_link, 1271 .drop_link = os_desc_unlink, 1272 }; 1273 1274 static const struct config_item_type os_desc_type = { 1275 .ct_item_ops = &os_desc_ops, 1276 .ct_attrs = os_desc_attrs, 1277 .ct_owner = THIS_MODULE, 1278 }; 1279 1280 static inline struct usb_os_desc_ext_prop 1281 *to_usb_os_desc_ext_prop(struct config_item *item) 1282 { 1283 return container_of(item, struct usb_os_desc_ext_prop, item); 1284 } 1285 1286 static ssize_t ext_prop_type_show(struct config_item *item, char *page) 1287 { 1288 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 1289 } 1290 1291 static ssize_t ext_prop_type_store(struct config_item *item, 1292 const char *page, size_t len) 1293 { 1294 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1295 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1296 u8 type; 1297 int ret; 1298 1299 ret = kstrtou8(page, 0, &type); 1300 if (ret) 1301 return ret; 1302 1303 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) 1304 return -EINVAL; 1305 1306 if (desc->opts_mutex) 1307 mutex_lock(desc->opts_mutex); 1308 1309 if ((ext_prop->type == USB_EXT_PROP_BINARY || 1310 ext_prop->type == USB_EXT_PROP_LE32 || 1311 ext_prop->type == USB_EXT_PROP_BE32) && 1312 (type == USB_EXT_PROP_UNICODE || 1313 type == USB_EXT_PROP_UNICODE_ENV || 1314 type == USB_EXT_PROP_UNICODE_LINK)) 1315 ext_prop->data_len <<= 1; 1316 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 1317 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1318 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 1319 (type == USB_EXT_PROP_BINARY || 1320 type == USB_EXT_PROP_LE32 || 1321 type == USB_EXT_PROP_BE32)) 1322 ext_prop->data_len >>= 1; 1323 ext_prop->type = type; 1324 1325 if (desc->opts_mutex) 1326 mutex_unlock(desc->opts_mutex); 1327 return len; 1328 } 1329 1330 static ssize_t ext_prop_data_show(struct config_item *item, char *page) 1331 { 1332 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1333 int len = ext_prop->data_len; 1334 1335 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1336 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1337 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1338 len >>= 1; 1339 memcpy(page, ext_prop->data, len); 1340 1341 return len; 1342 } 1343 1344 static ssize_t ext_prop_data_store(struct config_item *item, 1345 const char *page, size_t len) 1346 { 1347 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1348 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1349 char *new_data; 1350 size_t ret_len = len; 1351 1352 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1353 --len; 1354 new_data = kmemdup(page, len, GFP_KERNEL); 1355 if (!new_data) 1356 return -ENOMEM; 1357 1358 if (desc->opts_mutex) 1359 mutex_lock(desc->opts_mutex); 1360 kfree(ext_prop->data); 1361 ext_prop->data = new_data; 1362 desc->ext_prop_len -= ext_prop->data_len; 1363 ext_prop->data_len = len; 1364 desc->ext_prop_len += ext_prop->data_len; 1365 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1366 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1367 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1368 desc->ext_prop_len -= ext_prop->data_len; 1369 ext_prop->data_len <<= 1; 1370 ext_prop->data_len += 2; 1371 desc->ext_prop_len += ext_prop->data_len; 1372 } 1373 if (desc->opts_mutex) 1374 mutex_unlock(desc->opts_mutex); 1375 return ret_len; 1376 } 1377 1378 CONFIGFS_ATTR(ext_prop_, type); 1379 CONFIGFS_ATTR(ext_prop_, data); 1380 1381 static struct configfs_attribute *ext_prop_attrs[] = { 1382 &ext_prop_attr_type, 1383 &ext_prop_attr_data, 1384 NULL, 1385 }; 1386 1387 static void usb_os_desc_ext_prop_release(struct config_item *item) 1388 { 1389 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1390 1391 kfree(ext_prop); /* frees a whole chunk */ 1392 } 1393 1394 static struct configfs_item_operations ext_prop_ops = { 1395 .release = usb_os_desc_ext_prop_release, 1396 }; 1397 1398 static struct config_item *ext_prop_make( 1399 struct config_group *group, 1400 const char *name) 1401 { 1402 struct usb_os_desc_ext_prop *ext_prop; 1403 struct config_item_type *ext_prop_type; 1404 struct usb_os_desc *desc; 1405 char *vlabuf; 1406 1407 vla_group(data_chunk); 1408 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1409 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1410 1411 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1412 if (!vlabuf) 1413 return ERR_PTR(-ENOMEM); 1414 1415 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1416 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1417 1418 desc = container_of(group, struct usb_os_desc, group); 1419 ext_prop_type->ct_item_ops = &ext_prop_ops; 1420 ext_prop_type->ct_attrs = ext_prop_attrs; 1421 ext_prop_type->ct_owner = desc->owner; 1422 1423 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1424 1425 ext_prop->name = kstrdup(name, GFP_KERNEL); 1426 if (!ext_prop->name) { 1427 kfree(vlabuf); 1428 return ERR_PTR(-ENOMEM); 1429 } 1430 desc->ext_prop_len += 14; 1431 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1432 if (desc->opts_mutex) 1433 mutex_lock(desc->opts_mutex); 1434 desc->ext_prop_len += ext_prop->name_len; 1435 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1436 ++desc->ext_prop_count; 1437 if (desc->opts_mutex) 1438 mutex_unlock(desc->opts_mutex); 1439 1440 return &ext_prop->item; 1441 } 1442 1443 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1444 { 1445 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1446 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1447 1448 if (desc->opts_mutex) 1449 mutex_lock(desc->opts_mutex); 1450 list_del(&ext_prop->entry); 1451 --desc->ext_prop_count; 1452 kfree(ext_prop->name); 1453 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1454 if (desc->opts_mutex) 1455 mutex_unlock(desc->opts_mutex); 1456 config_item_put(item); 1457 } 1458 1459 static struct configfs_group_operations interf_grp_ops = { 1460 .make_item = &ext_prop_make, 1461 .drop_item = &ext_prop_drop, 1462 }; 1463 1464 static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1465 char *page) 1466 { 1467 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1468 return 8; 1469 } 1470 1471 static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1472 const char *page, size_t len) 1473 { 1474 struct usb_os_desc *desc = to_usb_os_desc(item); 1475 int l; 1476 1477 l = min_t(int, 8, len); 1478 if (page[l - 1] == '\n') 1479 --l; 1480 if (desc->opts_mutex) 1481 mutex_lock(desc->opts_mutex); 1482 memcpy(desc->ext_compat_id, page, l); 1483 1484 if (desc->opts_mutex) 1485 mutex_unlock(desc->opts_mutex); 1486 1487 return len; 1488 } 1489 1490 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1491 char *page) 1492 { 1493 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1494 return 8; 1495 } 1496 1497 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1498 const char *page, size_t len) 1499 { 1500 struct usb_os_desc *desc = to_usb_os_desc(item); 1501 int l; 1502 1503 l = min_t(int, 8, len); 1504 if (page[l - 1] == '\n') 1505 --l; 1506 if (desc->opts_mutex) 1507 mutex_lock(desc->opts_mutex); 1508 memcpy(desc->ext_compat_id + 8, page, l); 1509 1510 if (desc->opts_mutex) 1511 mutex_unlock(desc->opts_mutex); 1512 1513 return len; 1514 } 1515 1516 CONFIGFS_ATTR(interf_grp_, compatible_id); 1517 CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1518 1519 static struct configfs_attribute *interf_grp_attrs[] = { 1520 &interf_grp_attr_compatible_id, 1521 &interf_grp_attr_sub_compatible_id, 1522 NULL 1523 }; 1524 1525 struct config_group *usb_os_desc_prepare_interf_dir( 1526 struct config_group *parent, 1527 int n_interf, 1528 struct usb_os_desc **desc, 1529 char **names, 1530 struct module *owner) 1531 { 1532 struct config_group *os_desc_group; 1533 struct config_item_type *os_desc_type, *interface_type; 1534 1535 vla_group(data_chunk); 1536 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1537 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1538 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1539 1540 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1541 if (!vlabuf) 1542 return ERR_PTR(-ENOMEM); 1543 1544 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1545 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1546 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1547 1548 os_desc_type->ct_owner = owner; 1549 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1550 configfs_add_default_group(os_desc_group, parent); 1551 1552 interface_type->ct_group_ops = &interf_grp_ops; 1553 interface_type->ct_attrs = interf_grp_attrs; 1554 interface_type->ct_owner = owner; 1555 1556 while (n_interf--) { 1557 struct usb_os_desc *d; 1558 1559 d = desc[n_interf]; 1560 d->owner = owner; 1561 config_group_init_type_name(&d->group, "", interface_type); 1562 config_item_set_name(&d->group.cg_item, "interface.%s", 1563 names[n_interf]); 1564 configfs_add_default_group(&d->group, os_desc_group); 1565 } 1566 1567 return os_desc_group; 1568 } 1569 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1570 1571 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1572 { 1573 WARN_ON(1); 1574 return -EINVAL; 1575 } 1576 1577 int composite_dev_prepare(struct usb_composite_driver *composite, 1578 struct usb_composite_dev *dev); 1579 1580 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1581 struct usb_ep *ep0); 1582 1583 static void purge_configs_funcs(struct gadget_info *gi) 1584 { 1585 struct usb_configuration *c; 1586 1587 list_for_each_entry(c, &gi->cdev.configs, list) { 1588 struct usb_function *f, *tmp; 1589 struct config_usb_cfg *cfg; 1590 1591 cfg = container_of(c, struct config_usb_cfg, c); 1592 1593 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1594 1595 list_move(&f->list, &cfg->func_list); 1596 if (f->unbind) { 1597 dev_dbg(&gi->cdev.gadget->dev, 1598 "unbind function '%s'/%p\n", 1599 f->name, f); 1600 f->unbind(c, f); 1601 } 1602 } 1603 c->next_interface_id = 0; 1604 memset(c->interface, 0, sizeof(c->interface)); 1605 c->superspeed_plus = 0; 1606 c->superspeed = 0; 1607 c->highspeed = 0; 1608 c->fullspeed = 0; 1609 } 1610 } 1611 1612 static struct usb_string * 1613 configfs_attach_gadget_strings(struct gadget_info *gi) 1614 { 1615 struct usb_gadget_strings **gadget_strings; 1616 struct gadget_language *language; 1617 struct gadget_string *string; 1618 unsigned int nlangs = 0; 1619 struct list_head *iter; 1620 struct usb_string *us; 1621 unsigned int i = 0; 1622 int nstrings = -1; 1623 unsigned int j; 1624 1625 list_for_each(iter, &gi->string_list) 1626 nlangs++; 1627 1628 /* Bail out early if no languages are configured */ 1629 if (!nlangs) 1630 return NULL; 1631 1632 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */ 1633 sizeof(struct usb_gadget_strings *), GFP_KERNEL); 1634 if (!gadget_strings) 1635 return ERR_PTR(-ENOMEM); 1636 1637 list_for_each_entry(language, &gi->string_list, list) { 1638 struct usb_string *stringtab; 1639 1640 if (nstrings == -1) { 1641 nstrings = language->nstrings; 1642 } else if (nstrings != language->nstrings) { 1643 pr_err("languages must contain the same number of strings\n"); 1644 us = ERR_PTR(-EINVAL); 1645 goto cleanup; 1646 } 1647 1648 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string), 1649 GFP_KERNEL); 1650 if (!stringtab) { 1651 us = ERR_PTR(-ENOMEM); 1652 goto cleanup; 1653 } 1654 1655 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX; 1656 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer; 1657 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX; 1658 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product; 1659 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX; 1660 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber; 1661 1662 j = USB_GADGET_FIRST_AVAIL_IDX; 1663 list_for_each_entry(string, &language->gadget_strings, list) { 1664 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string)); 1665 j++; 1666 } 1667 1668 language->stringtab_dev.strings = stringtab; 1669 gadget_strings[i] = &language->stringtab_dev; 1670 i++; 1671 } 1672 1673 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings); 1674 1675 cleanup: 1676 list_for_each_entry(language, &gi->string_list, list) { 1677 kfree(language->stringtab_dev.strings); 1678 language->stringtab_dev.strings = NULL; 1679 } 1680 1681 kfree(gadget_strings); 1682 1683 return us; 1684 } 1685 1686 static int configfs_composite_bind(struct usb_gadget *gadget, 1687 struct usb_gadget_driver *gdriver) 1688 { 1689 struct usb_composite_driver *composite = to_cdriver(gdriver); 1690 struct gadget_info *gi = container_of(composite, 1691 struct gadget_info, composite); 1692 struct usb_composite_dev *cdev = &gi->cdev; 1693 struct usb_configuration *c; 1694 struct usb_string *s; 1695 unsigned i; 1696 int ret; 1697 1698 /* the gi->lock is hold by the caller */ 1699 gi->unbind = 0; 1700 cdev->gadget = gadget; 1701 set_gadget_data(gadget, cdev); 1702 ret = composite_dev_prepare(composite, cdev); 1703 if (ret) 1704 return ret; 1705 /* and now the gadget bind */ 1706 ret = -EINVAL; 1707 1708 if (list_empty(&gi->cdev.configs)) { 1709 pr_err("Need at least one configuration in %s.\n", 1710 gi->composite.name); 1711 goto err_comp_cleanup; 1712 } 1713 1714 1715 list_for_each_entry(c, &gi->cdev.configs, list) { 1716 struct config_usb_cfg *cfg; 1717 1718 cfg = container_of(c, struct config_usb_cfg, c); 1719 if (list_empty(&cfg->func_list)) { 1720 pr_err("Config %s/%d of %s needs at least one function.\n", 1721 c->label, c->bConfigurationValue, 1722 gi->composite.name); 1723 goto err_comp_cleanup; 1724 } 1725 } 1726 1727 /* init all strings */ 1728 if (!list_empty(&gi->string_list)) { 1729 s = configfs_attach_gadget_strings(gi); 1730 if (IS_ERR(s)) { 1731 ret = PTR_ERR(s); 1732 goto err_comp_cleanup; 1733 } 1734 1735 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1736 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1737 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1738 1739 gi->cdev.usb_strings = s; 1740 } 1741 1742 if (gi->use_webusb) { 1743 cdev->use_webusb = true; 1744 cdev->bcd_webusb_version = gi->bcd_webusb_version; 1745 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code; 1746 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH); 1747 } 1748 1749 if (gi->use_os_desc) { 1750 cdev->use_os_string = true; 1751 cdev->b_vendor_code = gi->b_vendor_code; 1752 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1753 } 1754 1755 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1756 struct usb_descriptor_header *usb_desc; 1757 1758 usb_desc = usb_otg_descriptor_alloc(gadget); 1759 if (!usb_desc) { 1760 ret = -ENOMEM; 1761 goto err_comp_cleanup; 1762 } 1763 usb_otg_descriptor_init(gadget, usb_desc); 1764 otg_desc[0] = usb_desc; 1765 otg_desc[1] = NULL; 1766 } 1767 1768 /* Go through all configs, attach all functions */ 1769 list_for_each_entry(c, &gi->cdev.configs, list) { 1770 struct config_usb_cfg *cfg; 1771 struct usb_function *f; 1772 struct usb_function *tmp; 1773 struct gadget_config_name *cn; 1774 1775 if (gadget_is_otg(gadget)) 1776 c->descriptors = otg_desc; 1777 1778 /* Properly configure the bmAttributes wakeup bit */ 1779 check_remote_wakeup_config(gadget, c); 1780 1781 cfg = container_of(c, struct config_usb_cfg, c); 1782 if (!list_empty(&cfg->string_list)) { 1783 i = 0; 1784 list_for_each_entry(cn, &cfg->string_list, list) { 1785 cfg->gstrings[i] = &cn->stringtab_dev; 1786 cn->stringtab_dev.strings = &cn->strings; 1787 cn->strings.s = cn->configuration; 1788 i++; 1789 } 1790 cfg->gstrings[i] = NULL; 1791 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1792 if (IS_ERR(s)) { 1793 ret = PTR_ERR(s); 1794 goto err_comp_cleanup; 1795 } 1796 c->iConfiguration = s[0].id; 1797 } 1798 1799 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1800 list_del(&f->list); 1801 ret = usb_add_function(c, f); 1802 if (ret) { 1803 list_add(&f->list, &cfg->func_list); 1804 goto err_purge_funcs; 1805 } 1806 } 1807 ret = usb_gadget_check_config(cdev->gadget); 1808 if (ret) 1809 goto err_purge_funcs; 1810 1811 usb_ep_autoconfig_reset(cdev->gadget); 1812 } 1813 if (cdev->use_os_string) { 1814 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1815 if (ret) 1816 goto err_purge_funcs; 1817 } 1818 1819 usb_ep_autoconfig_reset(cdev->gadget); 1820 return 0; 1821 1822 err_purge_funcs: 1823 purge_configs_funcs(gi); 1824 err_comp_cleanup: 1825 composite_dev_cleanup(cdev); 1826 return ret; 1827 } 1828 1829 static void configfs_composite_unbind(struct usb_gadget *gadget) 1830 { 1831 struct usb_composite_dev *cdev; 1832 struct gadget_info *gi; 1833 unsigned long flags; 1834 1835 /* the gi->lock is hold by the caller */ 1836 1837 cdev = get_gadget_data(gadget); 1838 gi = container_of(cdev, struct gadget_info, cdev); 1839 spin_lock_irqsave(&gi->spinlock, flags); 1840 gi->unbind = 1; 1841 spin_unlock_irqrestore(&gi->spinlock, flags); 1842 1843 kfree(otg_desc[0]); 1844 otg_desc[0] = NULL; 1845 purge_configs_funcs(gi); 1846 composite_dev_cleanup(cdev); 1847 usb_ep_autoconfig_reset(cdev->gadget); 1848 spin_lock_irqsave(&gi->spinlock, flags); 1849 cdev->gadget = NULL; 1850 cdev->deactivations = 0; 1851 gadget->deactivated = false; 1852 set_gadget_data(gadget, NULL); 1853 spin_unlock_irqrestore(&gi->spinlock, flags); 1854 } 1855 1856 static int configfs_composite_setup(struct usb_gadget *gadget, 1857 const struct usb_ctrlrequest *ctrl) 1858 { 1859 struct usb_composite_dev *cdev; 1860 struct gadget_info *gi; 1861 unsigned long flags; 1862 int ret; 1863 1864 cdev = get_gadget_data(gadget); 1865 if (!cdev) 1866 return 0; 1867 1868 gi = container_of(cdev, struct gadget_info, cdev); 1869 spin_lock_irqsave(&gi->spinlock, flags); 1870 cdev = get_gadget_data(gadget); 1871 if (!cdev || gi->unbind) { 1872 spin_unlock_irqrestore(&gi->spinlock, flags); 1873 return 0; 1874 } 1875 1876 ret = composite_setup(gadget, ctrl); 1877 spin_unlock_irqrestore(&gi->spinlock, flags); 1878 return ret; 1879 } 1880 1881 static void configfs_composite_disconnect(struct usb_gadget *gadget) 1882 { 1883 struct usb_composite_dev *cdev; 1884 struct gadget_info *gi; 1885 unsigned long flags; 1886 1887 cdev = get_gadget_data(gadget); 1888 if (!cdev) 1889 return; 1890 1891 gi = container_of(cdev, struct gadget_info, cdev); 1892 spin_lock_irqsave(&gi->spinlock, flags); 1893 cdev = get_gadget_data(gadget); 1894 if (!cdev || gi->unbind) { 1895 spin_unlock_irqrestore(&gi->spinlock, flags); 1896 return; 1897 } 1898 1899 composite_disconnect(gadget); 1900 spin_unlock_irqrestore(&gi->spinlock, flags); 1901 } 1902 1903 static void configfs_composite_reset(struct usb_gadget *gadget) 1904 { 1905 struct usb_composite_dev *cdev; 1906 struct gadget_info *gi; 1907 unsigned long flags; 1908 1909 cdev = get_gadget_data(gadget); 1910 if (!cdev) 1911 return; 1912 1913 gi = container_of(cdev, struct gadget_info, cdev); 1914 spin_lock_irqsave(&gi->spinlock, flags); 1915 cdev = get_gadget_data(gadget); 1916 if (!cdev || gi->unbind) { 1917 spin_unlock_irqrestore(&gi->spinlock, flags); 1918 return; 1919 } 1920 1921 composite_reset(gadget); 1922 spin_unlock_irqrestore(&gi->spinlock, flags); 1923 } 1924 1925 static void configfs_composite_suspend(struct usb_gadget *gadget) 1926 { 1927 struct usb_composite_dev *cdev; 1928 struct gadget_info *gi; 1929 unsigned long flags; 1930 1931 cdev = get_gadget_data(gadget); 1932 if (!cdev) 1933 return; 1934 1935 gi = container_of(cdev, struct gadget_info, cdev); 1936 spin_lock_irqsave(&gi->spinlock, flags); 1937 cdev = get_gadget_data(gadget); 1938 if (!cdev || gi->unbind) { 1939 spin_unlock_irqrestore(&gi->spinlock, flags); 1940 return; 1941 } 1942 1943 composite_suspend(gadget); 1944 spin_unlock_irqrestore(&gi->spinlock, flags); 1945 } 1946 1947 static void configfs_composite_resume(struct usb_gadget *gadget) 1948 { 1949 struct usb_composite_dev *cdev; 1950 struct gadget_info *gi; 1951 unsigned long flags; 1952 1953 cdev = get_gadget_data(gadget); 1954 if (!cdev) 1955 return; 1956 1957 gi = container_of(cdev, struct gadget_info, cdev); 1958 spin_lock_irqsave(&gi->spinlock, flags); 1959 cdev = get_gadget_data(gadget); 1960 if (!cdev || gi->unbind) { 1961 spin_unlock_irqrestore(&gi->spinlock, flags); 1962 return; 1963 } 1964 1965 composite_resume(gadget); 1966 spin_unlock_irqrestore(&gi->spinlock, flags); 1967 } 1968 1969 static const struct usb_gadget_driver configfs_driver_template = { 1970 .bind = configfs_composite_bind, 1971 .unbind = configfs_composite_unbind, 1972 1973 .setup = configfs_composite_setup, 1974 .reset = configfs_composite_reset, 1975 .disconnect = configfs_composite_disconnect, 1976 1977 .suspend = configfs_composite_suspend, 1978 .resume = configfs_composite_resume, 1979 1980 .max_speed = USB_SPEED_SUPER_PLUS, 1981 .driver = { 1982 .owner = THIS_MODULE, 1983 }, 1984 .match_existing_only = 1, 1985 }; 1986 1987 static struct config_group *gadgets_make( 1988 struct config_group *group, 1989 const char *name) 1990 { 1991 struct gadget_info *gi; 1992 1993 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1994 if (!gi) 1995 return ERR_PTR(-ENOMEM); 1996 1997 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1998 1999 config_group_init_type_name(&gi->functions_group, "functions", 2000 &functions_type); 2001 configfs_add_default_group(&gi->functions_group, &gi->group); 2002 2003 config_group_init_type_name(&gi->configs_group, "configs", 2004 &config_desc_type); 2005 configfs_add_default_group(&gi->configs_group, &gi->group); 2006 2007 config_group_init_type_name(&gi->strings_group, "strings", 2008 &gadget_language_strings_type); 2009 configfs_add_default_group(&gi->strings_group, &gi->group); 2010 2011 config_group_init_type_name(&gi->os_desc_group, "os_desc", 2012 &os_desc_type); 2013 configfs_add_default_group(&gi->os_desc_group, &gi->group); 2014 2015 config_group_init_type_name(&gi->webusb_group, "webusb", 2016 &webusb_type); 2017 configfs_add_default_group(&gi->webusb_group, &gi->group); 2018 2019 gi->composite.bind = configfs_do_nothing; 2020 gi->composite.unbind = configfs_do_nothing; 2021 gi->composite.suspend = NULL; 2022 gi->composite.resume = NULL; 2023 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 2024 2025 spin_lock_init(&gi->spinlock); 2026 mutex_init(&gi->lock); 2027 INIT_LIST_HEAD(&gi->string_list); 2028 INIT_LIST_HEAD(&gi->available_func); 2029 2030 composite_init_dev(&gi->cdev); 2031 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 2032 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 2033 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 2034 2035 gi->composite.gadget_driver = configfs_driver_template; 2036 2037 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL, 2038 "configfs-gadget.%s", name); 2039 if (!gi->composite.gadget_driver.driver.name) 2040 goto err; 2041 2042 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 2043 gi->composite.name = gi->composite.gadget_driver.function; 2044 2045 if (!gi->composite.gadget_driver.function) 2046 goto out_free_driver_name; 2047 2048 return &gi->group; 2049 2050 out_free_driver_name: 2051 kfree(gi->composite.gadget_driver.driver.name); 2052 err: 2053 kfree(gi); 2054 return ERR_PTR(-ENOMEM); 2055 } 2056 2057 static void gadgets_drop(struct config_group *group, struct config_item *item) 2058 { 2059 config_item_put(item); 2060 } 2061 2062 static struct configfs_group_operations gadgets_ops = { 2063 .make_group = &gadgets_make, 2064 .drop_item = &gadgets_drop, 2065 }; 2066 2067 static const struct config_item_type gadgets_type = { 2068 .ct_group_ops = &gadgets_ops, 2069 .ct_owner = THIS_MODULE, 2070 }; 2071 2072 static struct configfs_subsystem gadget_subsys = { 2073 .su_group = { 2074 .cg_item = { 2075 .ci_namebuf = "usb_gadget", 2076 .ci_type = &gadgets_type, 2077 }, 2078 }, 2079 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 2080 }; 2081 2082 void unregister_gadget_item(struct config_item *item) 2083 { 2084 struct gadget_info *gi = to_gadget_info(item); 2085 2086 mutex_lock(&gi->lock); 2087 unregister_gadget(gi); 2088 mutex_unlock(&gi->lock); 2089 } 2090 EXPORT_SYMBOL_GPL(unregister_gadget_item); 2091 2092 static int __init gadget_cfs_init(void) 2093 { 2094 int ret; 2095 2096 config_group_init(&gadget_subsys.su_group); 2097 2098 ret = configfs_register_subsystem(&gadget_subsys); 2099 return ret; 2100 } 2101 module_init(gadget_cfs_init); 2102 2103 static void __exit gadget_cfs_exit(void) 2104 { 2105 configfs_unregister_subsystem(&gadget_subsys); 2106 } 2107 module_exit(gadget_cfs_exit); 2108