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