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/gadget_configfs.h> 10 #include <linux/usb/webusb.h> 11 #include "configfs.h" 12 #include "u_f.h" 13 #include "u_os_desc.h" 14 15 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); 830 831 if (len > USB_MAX_STRING_LEN) 832 return -EINVAL; 833 834 return strscpy(string->string, page, size); 835 } 836 CONFIGFS_ATTR(gadget_string_, s); 837 838 static struct configfs_attribute *gadget_string_attrs[] = { 839 &gadget_string_attr_id, 840 &gadget_string_attr_s, 841 NULL, 842 }; 843 844 static void gadget_string_release(struct config_item *item) 845 { 846 struct gadget_string *string = to_gadget_string(item); 847 848 kfree(string); 849 } 850 851 static struct configfs_item_operations gadget_string_item_ops = { 852 .release = gadget_string_release, 853 }; 854 855 static const struct config_item_type gadget_string_type = { 856 .ct_item_ops = &gadget_string_item_ops, 857 .ct_attrs = gadget_string_attrs, 858 .ct_owner = THIS_MODULE, 859 }; 860 861 static struct config_item *gadget_language_string_make(struct config_group *group, 862 const char *name) 863 { 864 struct gadget_language *language; 865 struct gadget_string *string; 866 867 language = to_gadget_language(&group->cg_item); 868 869 string = kzalloc(sizeof(*string), GFP_KERNEL); 870 if (!string) 871 return ERR_PTR(-ENOMEM); 872 873 string->usb_string.id = language->nstrings++; 874 string->usb_string.s = string->string; 875 list_add_tail(&string->list, &language->gadget_strings); 876 877 config_item_init_type_name(&string->item, name, &gadget_string_type); 878 879 return &string->item; 880 } 881 882 static void gadget_language_string_drop(struct config_group *group, 883 struct config_item *item) 884 { 885 struct gadget_language *language; 886 struct gadget_string *string; 887 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX; 888 889 language = to_gadget_language(&group->cg_item); 890 string = to_gadget_string(item); 891 892 list_del(&string->list); 893 language->nstrings--; 894 895 /* Reset the ids for the language's strings to guarantee a continuous set */ 896 list_for_each_entry(string, &language->gadget_strings, list) 897 string->usb_string.id = i++; 898 } 899 900 static struct configfs_group_operations gadget_language_langid_group_ops = { 901 .make_item = gadget_language_string_make, 902 .drop_item = gadget_language_string_drop, 903 }; 904 905 static struct config_item_type gadget_language_type = { 906 .ct_item_ops = &gadget_language_langid_item_ops, 907 .ct_group_ops = &gadget_language_langid_group_ops, 908 .ct_attrs = gadget_language_langid_attrs, 909 .ct_owner = THIS_MODULE, 910 }; 911 912 static struct config_group *gadget_language_make(struct config_group *group, 913 const char *name) 914 { 915 struct gadget_info *gi; 916 struct gadget_language *gs; 917 struct gadget_language *new; 918 int langs = 0; 919 int ret; 920 921 new = kzalloc(sizeof(*new), GFP_KERNEL); 922 if (!new) 923 return ERR_PTR(-ENOMEM); 924 925 ret = check_user_usb_string(name, &new->stringtab_dev); 926 if (ret) 927 goto err; 928 config_group_init_type_name(&new->group, name, 929 &gadget_language_type); 930 931 gi = container_of(group, struct gadget_info, strings_group); 932 ret = -EEXIST; 933 list_for_each_entry(gs, &gi->string_list, list) { 934 if (gs->stringtab_dev.language == new->stringtab_dev.language) 935 goto err; 936 langs++; 937 } 938 ret = -EOVERFLOW; 939 if (langs >= MAX_USB_STRING_LANGS) 940 goto err; 941 942 list_add_tail(&new->list, &gi->string_list); 943 INIT_LIST_HEAD(&new->gadget_strings); 944 945 /* We have the default manufacturer, product and serialnumber strings */ 946 new->nstrings = 3; 947 return &new->group; 948 err: 949 kfree(new); 950 return ERR_PTR(ret); 951 } 952 953 static void gadget_language_drop(struct config_group *group, 954 struct config_item *item) 955 { 956 config_item_put(item); 957 } 958 959 static struct configfs_group_operations gadget_language_group_ops = { 960 .make_group = &gadget_language_make, 961 .drop_item = &gadget_language_drop, 962 }; 963 964 static struct config_item_type gadget_language_strings_type = { 965 .ct_group_ops = &gadget_language_group_ops, 966 .ct_owner = THIS_MODULE, 967 }; 968 969 static inline struct gadget_info *webusb_item_to_gadget_info( 970 struct config_item *item) 971 { 972 return container_of(to_config_group(item), 973 struct gadget_info, webusb_group); 974 } 975 976 static ssize_t webusb_use_show(struct config_item *item, char *page) 977 { 978 return sysfs_emit(page, "%d\n", 979 webusb_item_to_gadget_info(item)->use_webusb); 980 } 981 982 static ssize_t webusb_use_store(struct config_item *item, const char *page, 983 size_t len) 984 { 985 struct gadget_info *gi = webusb_item_to_gadget_info(item); 986 int ret; 987 bool use; 988 989 ret = kstrtobool(page, &use); 990 if (ret) 991 return ret; 992 993 mutex_lock(&gi->lock); 994 gi->use_webusb = use; 995 mutex_unlock(&gi->lock); 996 997 return len; 998 } 999 1000 static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page) 1001 { 1002 return sysfs_emit(page, "0x%04x\n", 1003 webusb_item_to_gadget_info(item)->bcd_webusb_version); 1004 } 1005 1006 static ssize_t webusb_bcdVersion_store(struct config_item *item, 1007 const char *page, size_t len) 1008 { 1009 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1010 u16 bcdVersion; 1011 int ret; 1012 1013 ret = kstrtou16(page, 0, &bcdVersion); 1014 if (ret) 1015 return ret; 1016 1017 ret = is_valid_bcd(bcdVersion); 1018 if (ret) 1019 return ret; 1020 1021 mutex_lock(&gi->lock); 1022 gi->bcd_webusb_version = bcdVersion; 1023 mutex_unlock(&gi->lock); 1024 1025 return len; 1026 } 1027 1028 static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page) 1029 { 1030 return sysfs_emit(page, "0x%02x\n", 1031 webusb_item_to_gadget_info(item)->b_webusb_vendor_code); 1032 } 1033 1034 static ssize_t webusb_bVendorCode_store(struct config_item *item, 1035 const char *page, size_t len) 1036 { 1037 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1038 int ret; 1039 u8 b_vendor_code; 1040 1041 ret = kstrtou8(page, 0, &b_vendor_code); 1042 if (ret) 1043 return ret; 1044 1045 mutex_lock(&gi->lock); 1046 gi->b_webusb_vendor_code = b_vendor_code; 1047 mutex_unlock(&gi->lock); 1048 1049 return len; 1050 } 1051 1052 static ssize_t webusb_landingPage_show(struct config_item *item, char *page) 1053 { 1054 return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page); 1055 } 1056 1057 static ssize_t webusb_landingPage_store(struct config_item *item, const char *page, 1058 size_t len) 1059 { 1060 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1061 unsigned int bytes_to_strip = 0; 1062 int l = len; 1063 1064 if (page[l - 1] == '\n') { 1065 --l; 1066 ++bytes_to_strip; 1067 } 1068 1069 if (l > sizeof(gi->landing_page)) { 1070 pr_err("webusb: landingPage URL too long\n"); 1071 return -EINVAL; 1072 } 1073 1074 // validation 1075 if (strncasecmp(page, "https://", 8) == 0) 1076 bytes_to_strip = 8; 1077 else if (strncasecmp(page, "http://", 7) == 0) 1078 bytes_to_strip = 7; 1079 else 1080 bytes_to_strip = 0; 1081 1082 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) { 1083 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n", 1084 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip); 1085 return -EINVAL; 1086 } 1087 1088 mutex_lock(&gi->lock); 1089 // ensure 0 bytes are set, in case the new landing page is shorter then the old one. 1090 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0); 1091 mutex_unlock(&gi->lock); 1092 1093 return len; 1094 } 1095 1096 CONFIGFS_ATTR(webusb_, use); 1097 CONFIGFS_ATTR(webusb_, bVendorCode); 1098 CONFIGFS_ATTR(webusb_, bcdVersion); 1099 CONFIGFS_ATTR(webusb_, landingPage); 1100 1101 static struct configfs_attribute *webusb_attrs[] = { 1102 &webusb_attr_use, 1103 &webusb_attr_bcdVersion, 1104 &webusb_attr_bVendorCode, 1105 &webusb_attr_landingPage, 1106 NULL, 1107 }; 1108 1109 static struct config_item_type webusb_type = { 1110 .ct_attrs = webusb_attrs, 1111 .ct_owner = THIS_MODULE, 1112 }; 1113 1114 static inline struct gadget_info *os_desc_item_to_gadget_info( 1115 struct config_item *item) 1116 { 1117 return container_of(to_config_group(item), 1118 struct gadget_info, os_desc_group); 1119 } 1120 1121 static ssize_t os_desc_use_show(struct config_item *item, char *page) 1122 { 1123 return sprintf(page, "%d\n", 1124 os_desc_item_to_gadget_info(item)->use_os_desc); 1125 } 1126 1127 static ssize_t os_desc_use_store(struct config_item *item, const char *page, 1128 size_t len) 1129 { 1130 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1131 int ret; 1132 bool use; 1133 1134 ret = kstrtobool(page, &use); 1135 if (ret) 1136 return ret; 1137 1138 mutex_lock(&gi->lock); 1139 gi->use_os_desc = use; 1140 mutex_unlock(&gi->lock); 1141 1142 return len; 1143 } 1144 1145 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 1146 { 1147 return sprintf(page, "0x%02x\n", 1148 os_desc_item_to_gadget_info(item)->b_vendor_code); 1149 } 1150 1151 static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 1152 const char *page, size_t len) 1153 { 1154 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1155 int ret; 1156 u8 b_vendor_code; 1157 1158 ret = kstrtou8(page, 0, &b_vendor_code); 1159 if (ret) 1160 return ret; 1161 1162 mutex_lock(&gi->lock); 1163 gi->b_vendor_code = b_vendor_code; 1164 mutex_unlock(&gi->lock); 1165 1166 return len; 1167 } 1168 1169 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 1170 { 1171 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1172 int res; 1173 1174 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 1175 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 1176 page[res++] = '\n'; 1177 1178 return res; 1179 } 1180 1181 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 1182 size_t len) 1183 { 1184 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1185 int res, l; 1186 1187 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); 1188 if (page[l - 1] == '\n') 1189 --l; 1190 1191 mutex_lock(&gi->lock); 1192 res = utf8s_to_utf16s(page, l, 1193 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 1194 OS_STRING_QW_SIGN_LEN); 1195 if (res > 0) 1196 res = len; 1197 mutex_unlock(&gi->lock); 1198 1199 return res; 1200 } 1201 1202 CONFIGFS_ATTR(os_desc_, use); 1203 CONFIGFS_ATTR(os_desc_, b_vendor_code); 1204 CONFIGFS_ATTR(os_desc_, qw_sign); 1205 1206 static struct configfs_attribute *os_desc_attrs[] = { 1207 &os_desc_attr_use, 1208 &os_desc_attr_b_vendor_code, 1209 &os_desc_attr_qw_sign, 1210 NULL, 1211 }; 1212 1213 static int os_desc_link(struct config_item *os_desc_ci, 1214 struct config_item *usb_cfg_ci) 1215 { 1216 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1217 struct usb_composite_dev *cdev = &gi->cdev; 1218 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 1219 struct usb_configuration *c = NULL, *iter; 1220 int ret; 1221 1222 mutex_lock(&gi->lock); 1223 list_for_each_entry(iter, &cdev->configs, list) { 1224 if (iter != &c_target->c) 1225 continue; 1226 c = iter; 1227 break; 1228 } 1229 if (!c) { 1230 ret = -EINVAL; 1231 goto out; 1232 } 1233 1234 if (cdev->os_desc_config) { 1235 ret = -EBUSY; 1236 goto out; 1237 } 1238 1239 cdev->os_desc_config = &c_target->c; 1240 ret = 0; 1241 1242 out: 1243 mutex_unlock(&gi->lock); 1244 return ret; 1245 } 1246 1247 static void os_desc_unlink(struct config_item *os_desc_ci, 1248 struct config_item *usb_cfg_ci) 1249 { 1250 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1251 struct usb_composite_dev *cdev = &gi->cdev; 1252 1253 mutex_lock(&gi->lock); 1254 if (gi->composite.gadget_driver.udc_name) 1255 unregister_gadget(gi); 1256 cdev->os_desc_config = NULL; 1257 WARN_ON(gi->composite.gadget_driver.udc_name); 1258 mutex_unlock(&gi->lock); 1259 } 1260 1261 static struct configfs_item_operations os_desc_ops = { 1262 .allow_link = os_desc_link, 1263 .drop_link = os_desc_unlink, 1264 }; 1265 1266 static struct config_item_type os_desc_type = { 1267 .ct_item_ops = &os_desc_ops, 1268 .ct_attrs = os_desc_attrs, 1269 .ct_owner = THIS_MODULE, 1270 }; 1271 1272 static inline struct usb_os_desc_ext_prop 1273 *to_usb_os_desc_ext_prop(struct config_item *item) 1274 { 1275 return container_of(item, struct usb_os_desc_ext_prop, item); 1276 } 1277 1278 static ssize_t ext_prop_type_show(struct config_item *item, char *page) 1279 { 1280 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 1281 } 1282 1283 static ssize_t ext_prop_type_store(struct config_item *item, 1284 const char *page, size_t len) 1285 { 1286 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1287 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1288 u8 type; 1289 int ret; 1290 1291 ret = kstrtou8(page, 0, &type); 1292 if (ret) 1293 return ret; 1294 1295 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) 1296 return -EINVAL; 1297 1298 if (desc->opts_mutex) 1299 mutex_lock(desc->opts_mutex); 1300 1301 if ((ext_prop->type == USB_EXT_PROP_BINARY || 1302 ext_prop->type == USB_EXT_PROP_LE32 || 1303 ext_prop->type == USB_EXT_PROP_BE32) && 1304 (type == USB_EXT_PROP_UNICODE || 1305 type == USB_EXT_PROP_UNICODE_ENV || 1306 type == USB_EXT_PROP_UNICODE_LINK)) 1307 ext_prop->data_len <<= 1; 1308 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 1309 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1310 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 1311 (type == USB_EXT_PROP_BINARY || 1312 type == USB_EXT_PROP_LE32 || 1313 type == USB_EXT_PROP_BE32)) 1314 ext_prop->data_len >>= 1; 1315 ext_prop->type = type; 1316 1317 if (desc->opts_mutex) 1318 mutex_unlock(desc->opts_mutex); 1319 return len; 1320 } 1321 1322 static ssize_t ext_prop_data_show(struct config_item *item, char *page) 1323 { 1324 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1325 int len = ext_prop->data_len; 1326 1327 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1328 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1329 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1330 len >>= 1; 1331 memcpy(page, ext_prop->data, len); 1332 1333 return len; 1334 } 1335 1336 static ssize_t ext_prop_data_store(struct config_item *item, 1337 const char *page, size_t len) 1338 { 1339 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1340 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1341 char *new_data; 1342 size_t ret_len = len; 1343 1344 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1345 --len; 1346 new_data = kmemdup(page, len, GFP_KERNEL); 1347 if (!new_data) 1348 return -ENOMEM; 1349 1350 if (desc->opts_mutex) 1351 mutex_lock(desc->opts_mutex); 1352 kfree(ext_prop->data); 1353 ext_prop->data = new_data; 1354 desc->ext_prop_len -= ext_prop->data_len; 1355 ext_prop->data_len = len; 1356 desc->ext_prop_len += ext_prop->data_len; 1357 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1358 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1359 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1360 desc->ext_prop_len -= ext_prop->data_len; 1361 ext_prop->data_len <<= 1; 1362 ext_prop->data_len += 2; 1363 desc->ext_prop_len += ext_prop->data_len; 1364 } 1365 if (desc->opts_mutex) 1366 mutex_unlock(desc->opts_mutex); 1367 return ret_len; 1368 } 1369 1370 CONFIGFS_ATTR(ext_prop_, type); 1371 CONFIGFS_ATTR(ext_prop_, data); 1372 1373 static struct configfs_attribute *ext_prop_attrs[] = { 1374 &ext_prop_attr_type, 1375 &ext_prop_attr_data, 1376 NULL, 1377 }; 1378 1379 static void usb_os_desc_ext_prop_release(struct config_item *item) 1380 { 1381 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1382 1383 kfree(ext_prop); /* frees a whole chunk */ 1384 } 1385 1386 static struct configfs_item_operations ext_prop_ops = { 1387 .release = usb_os_desc_ext_prop_release, 1388 }; 1389 1390 static struct config_item *ext_prop_make( 1391 struct config_group *group, 1392 const char *name) 1393 { 1394 struct usb_os_desc_ext_prop *ext_prop; 1395 struct config_item_type *ext_prop_type; 1396 struct usb_os_desc *desc; 1397 char *vlabuf; 1398 1399 vla_group(data_chunk); 1400 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1401 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1402 1403 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1404 if (!vlabuf) 1405 return ERR_PTR(-ENOMEM); 1406 1407 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1408 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1409 1410 desc = container_of(group, struct usb_os_desc, group); 1411 ext_prop_type->ct_item_ops = &ext_prop_ops; 1412 ext_prop_type->ct_attrs = ext_prop_attrs; 1413 ext_prop_type->ct_owner = desc->owner; 1414 1415 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1416 1417 ext_prop->name = kstrdup(name, GFP_KERNEL); 1418 if (!ext_prop->name) { 1419 kfree(vlabuf); 1420 return ERR_PTR(-ENOMEM); 1421 } 1422 desc->ext_prop_len += 14; 1423 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1424 if (desc->opts_mutex) 1425 mutex_lock(desc->opts_mutex); 1426 desc->ext_prop_len += ext_prop->name_len; 1427 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1428 ++desc->ext_prop_count; 1429 if (desc->opts_mutex) 1430 mutex_unlock(desc->opts_mutex); 1431 1432 return &ext_prop->item; 1433 } 1434 1435 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1436 { 1437 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1438 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1439 1440 if (desc->opts_mutex) 1441 mutex_lock(desc->opts_mutex); 1442 list_del(&ext_prop->entry); 1443 --desc->ext_prop_count; 1444 kfree(ext_prop->name); 1445 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1446 if (desc->opts_mutex) 1447 mutex_unlock(desc->opts_mutex); 1448 config_item_put(item); 1449 } 1450 1451 static struct configfs_group_operations interf_grp_ops = { 1452 .make_item = &ext_prop_make, 1453 .drop_item = &ext_prop_drop, 1454 }; 1455 1456 static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1457 char *page) 1458 { 1459 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1460 return 8; 1461 } 1462 1463 static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1464 const char *page, size_t len) 1465 { 1466 struct usb_os_desc *desc = to_usb_os_desc(item); 1467 int l; 1468 1469 l = min_t(int, 8, len); 1470 if (page[l - 1] == '\n') 1471 --l; 1472 if (desc->opts_mutex) 1473 mutex_lock(desc->opts_mutex); 1474 memcpy(desc->ext_compat_id, page, l); 1475 1476 if (desc->opts_mutex) 1477 mutex_unlock(desc->opts_mutex); 1478 1479 return len; 1480 } 1481 1482 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1483 char *page) 1484 { 1485 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1486 return 8; 1487 } 1488 1489 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1490 const char *page, size_t len) 1491 { 1492 struct usb_os_desc *desc = to_usb_os_desc(item); 1493 int l; 1494 1495 l = min_t(int, 8, len); 1496 if (page[l - 1] == '\n') 1497 --l; 1498 if (desc->opts_mutex) 1499 mutex_lock(desc->opts_mutex); 1500 memcpy(desc->ext_compat_id + 8, page, l); 1501 1502 if (desc->opts_mutex) 1503 mutex_unlock(desc->opts_mutex); 1504 1505 return len; 1506 } 1507 1508 CONFIGFS_ATTR(interf_grp_, compatible_id); 1509 CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1510 1511 static struct configfs_attribute *interf_grp_attrs[] = { 1512 &interf_grp_attr_compatible_id, 1513 &interf_grp_attr_sub_compatible_id, 1514 NULL 1515 }; 1516 1517 struct config_group *usb_os_desc_prepare_interf_dir( 1518 struct config_group *parent, 1519 int n_interf, 1520 struct usb_os_desc **desc, 1521 char **names, 1522 struct module *owner) 1523 { 1524 struct config_group *os_desc_group; 1525 struct config_item_type *os_desc_type, *interface_type; 1526 1527 vla_group(data_chunk); 1528 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1529 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1530 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1531 1532 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1533 if (!vlabuf) 1534 return ERR_PTR(-ENOMEM); 1535 1536 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1537 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1538 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1539 1540 os_desc_type->ct_owner = owner; 1541 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1542 configfs_add_default_group(os_desc_group, parent); 1543 1544 interface_type->ct_group_ops = &interf_grp_ops; 1545 interface_type->ct_attrs = interf_grp_attrs; 1546 interface_type->ct_owner = owner; 1547 1548 while (n_interf--) { 1549 struct usb_os_desc *d; 1550 1551 d = desc[n_interf]; 1552 d->owner = owner; 1553 config_group_init_type_name(&d->group, "", interface_type); 1554 config_item_set_name(&d->group.cg_item, "interface.%s", 1555 names[n_interf]); 1556 configfs_add_default_group(&d->group, os_desc_group); 1557 } 1558 1559 return os_desc_group; 1560 } 1561 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1562 1563 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1564 { 1565 WARN_ON(1); 1566 return -EINVAL; 1567 } 1568 1569 int composite_dev_prepare(struct usb_composite_driver *composite, 1570 struct usb_composite_dev *dev); 1571 1572 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1573 struct usb_ep *ep0); 1574 1575 static void purge_configs_funcs(struct gadget_info *gi) 1576 { 1577 struct usb_configuration *c; 1578 1579 list_for_each_entry(c, &gi->cdev.configs, list) { 1580 struct usb_function *f, *tmp; 1581 struct config_usb_cfg *cfg; 1582 1583 cfg = container_of(c, struct config_usb_cfg, c); 1584 1585 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1586 1587 list_move(&f->list, &cfg->func_list); 1588 if (f->unbind) { 1589 dev_dbg(&gi->cdev.gadget->dev, 1590 "unbind function '%s'/%p\n", 1591 f->name, f); 1592 f->unbind(c, f); 1593 } 1594 } 1595 c->next_interface_id = 0; 1596 memset(c->interface, 0, sizeof(c->interface)); 1597 c->superspeed_plus = 0; 1598 c->superspeed = 0; 1599 c->highspeed = 0; 1600 c->fullspeed = 0; 1601 } 1602 } 1603 1604 static struct usb_string * 1605 configfs_attach_gadget_strings(struct gadget_info *gi) 1606 { 1607 struct usb_gadget_strings **gadget_strings; 1608 struct gadget_language *language; 1609 struct gadget_string *string; 1610 unsigned int nlangs = 0; 1611 struct list_head *iter; 1612 struct usb_string *us; 1613 unsigned int i = 0; 1614 int nstrings = -1; 1615 unsigned int j; 1616 1617 list_for_each(iter, &gi->string_list) 1618 nlangs++; 1619 1620 /* Bail out early if no languages are configured */ 1621 if (!nlangs) 1622 return NULL; 1623 1624 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */ 1625 sizeof(struct usb_gadget_strings *), GFP_KERNEL); 1626 if (!gadget_strings) 1627 return ERR_PTR(-ENOMEM); 1628 1629 list_for_each_entry(language, &gi->string_list, list) { 1630 struct usb_string *stringtab; 1631 1632 if (nstrings == -1) { 1633 nstrings = language->nstrings; 1634 } else if (nstrings != language->nstrings) { 1635 pr_err("languages must contain the same number of strings\n"); 1636 us = ERR_PTR(-EINVAL); 1637 goto cleanup; 1638 } 1639 1640 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string), 1641 GFP_KERNEL); 1642 if (!stringtab) { 1643 us = ERR_PTR(-ENOMEM); 1644 goto cleanup; 1645 } 1646 1647 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX; 1648 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer; 1649 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX; 1650 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product; 1651 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX; 1652 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber; 1653 1654 j = USB_GADGET_FIRST_AVAIL_IDX; 1655 list_for_each_entry(string, &language->gadget_strings, list) { 1656 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string)); 1657 j++; 1658 } 1659 1660 language->stringtab_dev.strings = stringtab; 1661 gadget_strings[i] = &language->stringtab_dev; 1662 i++; 1663 } 1664 1665 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings); 1666 1667 cleanup: 1668 list_for_each_entry(language, &gi->string_list, list) { 1669 kfree(language->stringtab_dev.strings); 1670 language->stringtab_dev.strings = NULL; 1671 } 1672 1673 kfree(gadget_strings); 1674 1675 return us; 1676 } 1677 1678 static int configfs_composite_bind(struct usb_gadget *gadget, 1679 struct usb_gadget_driver *gdriver) 1680 { 1681 struct usb_composite_driver *composite = to_cdriver(gdriver); 1682 struct gadget_info *gi = container_of(composite, 1683 struct gadget_info, composite); 1684 struct usb_composite_dev *cdev = &gi->cdev; 1685 struct usb_configuration *c; 1686 struct usb_string *s; 1687 unsigned i; 1688 int ret; 1689 1690 /* the gi->lock is hold by the caller */ 1691 gi->unbind = 0; 1692 cdev->gadget = gadget; 1693 set_gadget_data(gadget, cdev); 1694 ret = composite_dev_prepare(composite, cdev); 1695 if (ret) 1696 return ret; 1697 /* and now the gadget bind */ 1698 ret = -EINVAL; 1699 1700 if (list_empty(&gi->cdev.configs)) { 1701 pr_err("Need at least one configuration in %s.\n", 1702 gi->composite.name); 1703 goto err_comp_cleanup; 1704 } 1705 1706 1707 list_for_each_entry(c, &gi->cdev.configs, list) { 1708 struct config_usb_cfg *cfg; 1709 1710 cfg = container_of(c, struct config_usb_cfg, c); 1711 if (list_empty(&cfg->func_list)) { 1712 pr_err("Config %s/%d of %s needs at least one function.\n", 1713 c->label, c->bConfigurationValue, 1714 gi->composite.name); 1715 goto err_comp_cleanup; 1716 } 1717 } 1718 1719 /* init all strings */ 1720 if (!list_empty(&gi->string_list)) { 1721 s = configfs_attach_gadget_strings(gi); 1722 if (IS_ERR(s)) { 1723 ret = PTR_ERR(s); 1724 goto err_comp_cleanup; 1725 } 1726 1727 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1728 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1729 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1730 1731 gi->cdev.usb_strings = s; 1732 } 1733 1734 if (gi->use_webusb) { 1735 cdev->use_webusb = true; 1736 cdev->bcd_webusb_version = gi->bcd_webusb_version; 1737 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code; 1738 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH); 1739 } 1740 1741 if (gi->use_os_desc) { 1742 cdev->use_os_string = true; 1743 cdev->b_vendor_code = gi->b_vendor_code; 1744 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1745 } 1746 1747 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1748 struct usb_descriptor_header *usb_desc; 1749 1750 usb_desc = usb_otg_descriptor_alloc(gadget); 1751 if (!usb_desc) { 1752 ret = -ENOMEM; 1753 goto err_comp_cleanup; 1754 } 1755 usb_otg_descriptor_init(gadget, usb_desc); 1756 otg_desc[0] = usb_desc; 1757 otg_desc[1] = NULL; 1758 } 1759 1760 /* Go through all configs, attach all functions */ 1761 list_for_each_entry(c, &gi->cdev.configs, list) { 1762 struct config_usb_cfg *cfg; 1763 struct usb_function *f; 1764 struct usb_function *tmp; 1765 struct gadget_config_name *cn; 1766 1767 if (gadget_is_otg(gadget)) 1768 c->descriptors = otg_desc; 1769 1770 /* Properly configure the bmAttributes wakeup bit */ 1771 check_remote_wakeup_config(gadget, c); 1772 1773 cfg = container_of(c, struct config_usb_cfg, c); 1774 if (!list_empty(&cfg->string_list)) { 1775 i = 0; 1776 list_for_each_entry(cn, &cfg->string_list, list) { 1777 cfg->gstrings[i] = &cn->stringtab_dev; 1778 cn->stringtab_dev.strings = &cn->strings; 1779 cn->strings.s = cn->configuration; 1780 i++; 1781 } 1782 cfg->gstrings[i] = NULL; 1783 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1784 if (IS_ERR(s)) { 1785 ret = PTR_ERR(s); 1786 goto err_comp_cleanup; 1787 } 1788 c->iConfiguration = s[0].id; 1789 } 1790 1791 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1792 list_del(&f->list); 1793 ret = usb_add_function(c, f); 1794 if (ret) { 1795 list_add(&f->list, &cfg->func_list); 1796 goto err_purge_funcs; 1797 } 1798 } 1799 ret = usb_gadget_check_config(cdev->gadget); 1800 if (ret) 1801 goto err_purge_funcs; 1802 1803 usb_ep_autoconfig_reset(cdev->gadget); 1804 } 1805 if (cdev->use_os_string) { 1806 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1807 if (ret) 1808 goto err_purge_funcs; 1809 } 1810 1811 usb_ep_autoconfig_reset(cdev->gadget); 1812 return 0; 1813 1814 err_purge_funcs: 1815 purge_configs_funcs(gi); 1816 err_comp_cleanup: 1817 composite_dev_cleanup(cdev); 1818 return ret; 1819 } 1820 1821 static void configfs_composite_unbind(struct usb_gadget *gadget) 1822 { 1823 struct usb_composite_dev *cdev; 1824 struct gadget_info *gi; 1825 unsigned long flags; 1826 1827 /* the gi->lock is hold by the caller */ 1828 1829 cdev = get_gadget_data(gadget); 1830 gi = container_of(cdev, struct gadget_info, cdev); 1831 spin_lock_irqsave(&gi->spinlock, flags); 1832 gi->unbind = 1; 1833 spin_unlock_irqrestore(&gi->spinlock, flags); 1834 1835 kfree(otg_desc[0]); 1836 otg_desc[0] = NULL; 1837 purge_configs_funcs(gi); 1838 composite_dev_cleanup(cdev); 1839 usb_ep_autoconfig_reset(cdev->gadget); 1840 spin_lock_irqsave(&gi->spinlock, flags); 1841 cdev->gadget = NULL; 1842 cdev->deactivations = 0; 1843 gadget->deactivated = false; 1844 set_gadget_data(gadget, NULL); 1845 spin_unlock_irqrestore(&gi->spinlock, flags); 1846 } 1847 1848 static int configfs_composite_setup(struct usb_gadget *gadget, 1849 const struct usb_ctrlrequest *ctrl) 1850 { 1851 struct usb_composite_dev *cdev; 1852 struct gadget_info *gi; 1853 unsigned long flags; 1854 int ret; 1855 1856 cdev = get_gadget_data(gadget); 1857 if (!cdev) 1858 return 0; 1859 1860 gi = container_of(cdev, struct gadget_info, cdev); 1861 spin_lock_irqsave(&gi->spinlock, flags); 1862 cdev = get_gadget_data(gadget); 1863 if (!cdev || gi->unbind) { 1864 spin_unlock_irqrestore(&gi->spinlock, flags); 1865 return 0; 1866 } 1867 1868 ret = composite_setup(gadget, ctrl); 1869 spin_unlock_irqrestore(&gi->spinlock, flags); 1870 return ret; 1871 } 1872 1873 static void configfs_composite_disconnect(struct usb_gadget *gadget) 1874 { 1875 struct usb_composite_dev *cdev; 1876 struct gadget_info *gi; 1877 unsigned long flags; 1878 1879 cdev = get_gadget_data(gadget); 1880 if (!cdev) 1881 return; 1882 1883 gi = container_of(cdev, struct gadget_info, cdev); 1884 spin_lock_irqsave(&gi->spinlock, flags); 1885 cdev = get_gadget_data(gadget); 1886 if (!cdev || gi->unbind) { 1887 spin_unlock_irqrestore(&gi->spinlock, flags); 1888 return; 1889 } 1890 1891 composite_disconnect(gadget); 1892 spin_unlock_irqrestore(&gi->spinlock, flags); 1893 } 1894 1895 static void configfs_composite_reset(struct usb_gadget *gadget) 1896 { 1897 struct usb_composite_dev *cdev; 1898 struct gadget_info *gi; 1899 unsigned long flags; 1900 1901 cdev = get_gadget_data(gadget); 1902 if (!cdev) 1903 return; 1904 1905 gi = container_of(cdev, struct gadget_info, cdev); 1906 spin_lock_irqsave(&gi->spinlock, flags); 1907 cdev = get_gadget_data(gadget); 1908 if (!cdev || gi->unbind) { 1909 spin_unlock_irqrestore(&gi->spinlock, flags); 1910 return; 1911 } 1912 1913 composite_reset(gadget); 1914 spin_unlock_irqrestore(&gi->spinlock, flags); 1915 } 1916 1917 static void configfs_composite_suspend(struct usb_gadget *gadget) 1918 { 1919 struct usb_composite_dev *cdev; 1920 struct gadget_info *gi; 1921 unsigned long flags; 1922 1923 cdev = get_gadget_data(gadget); 1924 if (!cdev) 1925 return; 1926 1927 gi = container_of(cdev, struct gadget_info, cdev); 1928 spin_lock_irqsave(&gi->spinlock, flags); 1929 cdev = get_gadget_data(gadget); 1930 if (!cdev || gi->unbind) { 1931 spin_unlock_irqrestore(&gi->spinlock, flags); 1932 return; 1933 } 1934 1935 composite_suspend(gadget); 1936 spin_unlock_irqrestore(&gi->spinlock, flags); 1937 } 1938 1939 static void configfs_composite_resume(struct usb_gadget *gadget) 1940 { 1941 struct usb_composite_dev *cdev; 1942 struct gadget_info *gi; 1943 unsigned long flags; 1944 1945 cdev = get_gadget_data(gadget); 1946 if (!cdev) 1947 return; 1948 1949 gi = container_of(cdev, struct gadget_info, cdev); 1950 spin_lock_irqsave(&gi->spinlock, flags); 1951 cdev = get_gadget_data(gadget); 1952 if (!cdev || gi->unbind) { 1953 spin_unlock_irqrestore(&gi->spinlock, flags); 1954 return; 1955 } 1956 1957 composite_resume(gadget); 1958 spin_unlock_irqrestore(&gi->spinlock, flags); 1959 } 1960 1961 static const struct usb_gadget_driver configfs_driver_template = { 1962 .bind = configfs_composite_bind, 1963 .unbind = configfs_composite_unbind, 1964 1965 .setup = configfs_composite_setup, 1966 .reset = configfs_composite_reset, 1967 .disconnect = configfs_composite_disconnect, 1968 1969 .suspend = configfs_composite_suspend, 1970 .resume = configfs_composite_resume, 1971 1972 .max_speed = USB_SPEED_SUPER_PLUS, 1973 .driver = { 1974 .owner = THIS_MODULE, 1975 }, 1976 .match_existing_only = 1, 1977 }; 1978 1979 static struct config_group *gadgets_make( 1980 struct config_group *group, 1981 const char *name) 1982 { 1983 struct gadget_info *gi; 1984 1985 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1986 if (!gi) 1987 return ERR_PTR(-ENOMEM); 1988 1989 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1990 1991 config_group_init_type_name(&gi->functions_group, "functions", 1992 &functions_type); 1993 configfs_add_default_group(&gi->functions_group, &gi->group); 1994 1995 config_group_init_type_name(&gi->configs_group, "configs", 1996 &config_desc_type); 1997 configfs_add_default_group(&gi->configs_group, &gi->group); 1998 1999 config_group_init_type_name(&gi->strings_group, "strings", 2000 &gadget_language_strings_type); 2001 configfs_add_default_group(&gi->strings_group, &gi->group); 2002 2003 config_group_init_type_name(&gi->os_desc_group, "os_desc", 2004 &os_desc_type); 2005 configfs_add_default_group(&gi->os_desc_group, &gi->group); 2006 2007 config_group_init_type_name(&gi->webusb_group, "webusb", 2008 &webusb_type); 2009 configfs_add_default_group(&gi->webusb_group, &gi->group); 2010 2011 gi->composite.bind = configfs_do_nothing; 2012 gi->composite.unbind = configfs_do_nothing; 2013 gi->composite.suspend = NULL; 2014 gi->composite.resume = NULL; 2015 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 2016 2017 spin_lock_init(&gi->spinlock); 2018 mutex_init(&gi->lock); 2019 INIT_LIST_HEAD(&gi->string_list); 2020 INIT_LIST_HEAD(&gi->available_func); 2021 2022 composite_init_dev(&gi->cdev); 2023 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 2024 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 2025 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 2026 2027 gi->composite.gadget_driver = configfs_driver_template; 2028 2029 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL, 2030 "configfs-gadget.%s", name); 2031 if (!gi->composite.gadget_driver.driver.name) 2032 goto err; 2033 2034 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 2035 gi->composite.name = gi->composite.gadget_driver.function; 2036 2037 if (!gi->composite.gadget_driver.function) 2038 goto out_free_driver_name; 2039 2040 return &gi->group; 2041 2042 out_free_driver_name: 2043 kfree(gi->composite.gadget_driver.driver.name); 2044 err: 2045 kfree(gi); 2046 return ERR_PTR(-ENOMEM); 2047 } 2048 2049 static void gadgets_drop(struct config_group *group, struct config_item *item) 2050 { 2051 config_item_put(item); 2052 } 2053 2054 static struct configfs_group_operations gadgets_ops = { 2055 .make_group = &gadgets_make, 2056 .drop_item = &gadgets_drop, 2057 }; 2058 2059 static const struct config_item_type gadgets_type = { 2060 .ct_group_ops = &gadgets_ops, 2061 .ct_owner = THIS_MODULE, 2062 }; 2063 2064 static struct configfs_subsystem gadget_subsys = { 2065 .su_group = { 2066 .cg_item = { 2067 .ci_namebuf = "usb_gadget", 2068 .ci_type = &gadgets_type, 2069 }, 2070 }, 2071 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 2072 }; 2073 2074 void unregister_gadget_item(struct config_item *item) 2075 { 2076 struct gadget_info *gi = to_gadget_info(item); 2077 2078 mutex_lock(&gi->lock); 2079 unregister_gadget(gi); 2080 mutex_unlock(&gi->lock); 2081 } 2082 EXPORT_SYMBOL_GPL(unregister_gadget_item); 2083 2084 static int __init gadget_cfs_init(void) 2085 { 2086 int ret; 2087 2088 config_group_init(&gadget_subsys.su_group); 2089 2090 ret = configfs_register_subsystem(&gadget_subsys); 2091 return ret; 2092 } 2093 module_init(gadget_cfs_init); 2094 2095 static void __exit gadget_cfs_exit(void) 2096 { 2097 configfs_unregister_subsystem(&gadget_subsys); 2098 } 2099 module_exit(gadget_cfs_exit); 2100