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 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 613 if (ret >= MAX_NAME_LEN) 614 return ERR_PTR(-ENAMETOOLONG); 615 616 func_name = buf; 617 instance_name = strchr(func_name, '.'); 618 if (!instance_name) { 619 pr_err("Unable to locate . in FUNC.INSTANCE\n"); 620 return ERR_PTR(-EINVAL); 621 } 622 *instance_name = '\0'; 623 instance_name++; 624 625 fi = usb_get_function_instance(func_name); 626 if (IS_ERR(fi)) 627 return ERR_CAST(fi); 628 629 ret = config_item_set_name(&fi->group.cg_item, "%s", name); 630 if (ret) { 631 usb_put_function_instance(fi); 632 return ERR_PTR(ret); 633 } 634 if (fi->set_inst_name) { 635 ret = fi->set_inst_name(fi, instance_name); 636 if (ret) { 637 usb_put_function_instance(fi); 638 return ERR_PTR(ret); 639 } 640 } 641 642 gi = container_of(group, struct gadget_info, functions_group); 643 644 mutex_lock(&gi->lock); 645 list_add_tail(&fi->cfs_list, &gi->available_func); 646 mutex_unlock(&gi->lock); 647 return &fi->group; 648 } 649 650 static void function_drop( 651 struct config_group *group, 652 struct config_item *item) 653 { 654 struct usb_function_instance *fi = to_usb_function_instance(item); 655 struct gadget_info *gi; 656 657 gi = container_of(group, struct gadget_info, functions_group); 658 659 mutex_lock(&gi->lock); 660 list_del(&fi->cfs_list); 661 mutex_unlock(&gi->lock); 662 config_item_put(item); 663 } 664 665 static struct configfs_group_operations functions_ops = { 666 .make_group = &function_make, 667 .drop_item = &function_drop, 668 }; 669 670 static const struct config_item_type functions_type = { 671 .ct_group_ops = &functions_ops, 672 .ct_owner = THIS_MODULE, 673 }; 674 675 GS_STRINGS_RW(gadget_config_name, configuration); 676 677 static struct configfs_attribute *gadget_config_name_langid_attrs[] = { 678 &gadget_config_name_attr_configuration, 679 NULL, 680 }; 681 682 static void gadget_config_name_attr_release(struct config_item *item) 683 { 684 struct gadget_config_name *cn = to_gadget_config_name(item); 685 686 kfree(cn->configuration); 687 688 list_del(&cn->list); 689 kfree(cn); 690 } 691 692 USB_CONFIG_STRING_RW_OPS(gadget_config_name); 693 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg); 694 695 static struct config_group *config_desc_make( 696 struct config_group *group, 697 const char *name) 698 { 699 struct gadget_info *gi; 700 struct config_usb_cfg *cfg; 701 char buf[MAX_NAME_LEN]; 702 char *num_str; 703 u8 num; 704 int ret; 705 706 gi = container_of(group, struct gadget_info, configs_group); 707 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 708 if (ret >= MAX_NAME_LEN) 709 return ERR_PTR(-ENAMETOOLONG); 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 = snprintf(page, sizeof(string->string), "%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 ssize_t cpy_len; 828 829 if (len > USB_MAX_STRING_LEN) 830 return -EINVAL; 831 832 cpy_len = strscpy(string->string, page, size); 833 if (cpy_len > 0 && string->string[cpy_len - 1] == '\n') 834 string->string[cpy_len - 1] = 0; 835 return len; 836 } 837 CONFIGFS_ATTR(gadget_string_, s); 838 839 static struct configfs_attribute *gadget_string_attrs[] = { 840 &gadget_string_attr_id, 841 &gadget_string_attr_s, 842 NULL, 843 }; 844 845 static void gadget_string_release(struct config_item *item) 846 { 847 struct gadget_string *string = to_gadget_string(item); 848 849 kfree(string); 850 } 851 852 static struct configfs_item_operations gadget_string_item_ops = { 853 .release = gadget_string_release, 854 }; 855 856 static const struct config_item_type gadget_string_type = { 857 .ct_item_ops = &gadget_string_item_ops, 858 .ct_attrs = gadget_string_attrs, 859 .ct_owner = THIS_MODULE, 860 }; 861 862 static struct config_item *gadget_language_string_make(struct config_group *group, 863 const char *name) 864 { 865 struct gadget_language *language; 866 struct gadget_string *string; 867 868 language = to_gadget_language(&group->cg_item); 869 870 string = kzalloc(sizeof(*string), GFP_KERNEL); 871 if (!string) 872 return ERR_PTR(-ENOMEM); 873 874 string->usb_string.id = language->nstrings++; 875 string->usb_string.s = string->string; 876 list_add_tail(&string->list, &language->gadget_strings); 877 878 config_item_init_type_name(&string->item, name, &gadget_string_type); 879 880 return &string->item; 881 } 882 883 static void gadget_language_string_drop(struct config_group *group, 884 struct config_item *item) 885 { 886 struct gadget_language *language; 887 struct gadget_string *string; 888 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX; 889 890 language = to_gadget_language(&group->cg_item); 891 string = to_gadget_string(item); 892 893 list_del(&string->list); 894 language->nstrings--; 895 896 /* Reset the ids for the language's strings to guarantee a continuous set */ 897 list_for_each_entry(string, &language->gadget_strings, list) 898 string->usb_string.id = i++; 899 } 900 901 static struct configfs_group_operations gadget_language_langid_group_ops = { 902 .make_item = gadget_language_string_make, 903 .drop_item = gadget_language_string_drop, 904 }; 905 906 static struct config_item_type gadget_language_type = { 907 .ct_item_ops = &gadget_language_langid_item_ops, 908 .ct_group_ops = &gadget_language_langid_group_ops, 909 .ct_attrs = gadget_language_langid_attrs, 910 .ct_owner = THIS_MODULE, 911 }; 912 913 static struct config_group *gadget_language_make(struct config_group *group, 914 const char *name) 915 { 916 struct gadget_info *gi; 917 struct gadget_language *gs; 918 struct gadget_language *new; 919 int langs = 0; 920 int ret; 921 922 new = kzalloc(sizeof(*new), GFP_KERNEL); 923 if (!new) 924 return ERR_PTR(-ENOMEM); 925 926 ret = check_user_usb_string(name, &new->stringtab_dev); 927 if (ret) 928 goto err; 929 config_group_init_type_name(&new->group, name, 930 &gadget_language_type); 931 932 gi = container_of(group, struct gadget_info, strings_group); 933 ret = -EEXIST; 934 list_for_each_entry(gs, &gi->string_list, list) { 935 if (gs->stringtab_dev.language == new->stringtab_dev.language) 936 goto err; 937 langs++; 938 } 939 ret = -EOVERFLOW; 940 if (langs >= MAX_USB_STRING_LANGS) 941 goto err; 942 943 list_add_tail(&new->list, &gi->string_list); 944 INIT_LIST_HEAD(&new->gadget_strings); 945 946 /* We have the default manufacturer, product and serialnumber strings */ 947 new->nstrings = 3; 948 return &new->group; 949 err: 950 kfree(new); 951 return ERR_PTR(ret); 952 } 953 954 static void gadget_language_drop(struct config_group *group, 955 struct config_item *item) 956 { 957 config_item_put(item); 958 } 959 960 static struct configfs_group_operations gadget_language_group_ops = { 961 .make_group = &gadget_language_make, 962 .drop_item = &gadget_language_drop, 963 }; 964 965 static struct config_item_type gadget_language_strings_type = { 966 .ct_group_ops = &gadget_language_group_ops, 967 .ct_owner = THIS_MODULE, 968 }; 969 970 static inline struct gadget_info *webusb_item_to_gadget_info( 971 struct config_item *item) 972 { 973 return container_of(to_config_group(item), 974 struct gadget_info, webusb_group); 975 } 976 977 static ssize_t webusb_use_show(struct config_item *item, char *page) 978 { 979 return sysfs_emit(page, "%d\n", 980 webusb_item_to_gadget_info(item)->use_webusb); 981 } 982 983 static ssize_t webusb_use_store(struct config_item *item, const char *page, 984 size_t len) 985 { 986 struct gadget_info *gi = webusb_item_to_gadget_info(item); 987 int ret; 988 bool use; 989 990 ret = kstrtobool(page, &use); 991 if (ret) 992 return ret; 993 994 mutex_lock(&gi->lock); 995 gi->use_webusb = use; 996 mutex_unlock(&gi->lock); 997 998 return len; 999 } 1000 1001 static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page) 1002 { 1003 return sysfs_emit(page, "0x%04x\n", 1004 webusb_item_to_gadget_info(item)->bcd_webusb_version); 1005 } 1006 1007 static ssize_t webusb_bcdVersion_store(struct config_item *item, 1008 const char *page, size_t len) 1009 { 1010 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1011 u16 bcdVersion; 1012 int ret; 1013 1014 ret = kstrtou16(page, 0, &bcdVersion); 1015 if (ret) 1016 return ret; 1017 1018 ret = is_valid_bcd(bcdVersion); 1019 if (ret) 1020 return ret; 1021 1022 mutex_lock(&gi->lock); 1023 gi->bcd_webusb_version = bcdVersion; 1024 mutex_unlock(&gi->lock); 1025 1026 return len; 1027 } 1028 1029 static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page) 1030 { 1031 return sysfs_emit(page, "0x%02x\n", 1032 webusb_item_to_gadget_info(item)->b_webusb_vendor_code); 1033 } 1034 1035 static ssize_t webusb_bVendorCode_store(struct config_item *item, 1036 const char *page, size_t len) 1037 { 1038 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1039 int ret; 1040 u8 b_vendor_code; 1041 1042 ret = kstrtou8(page, 0, &b_vendor_code); 1043 if (ret) 1044 return ret; 1045 1046 mutex_lock(&gi->lock); 1047 gi->b_webusb_vendor_code = b_vendor_code; 1048 mutex_unlock(&gi->lock); 1049 1050 return len; 1051 } 1052 1053 static ssize_t webusb_landingPage_show(struct config_item *item, char *page) 1054 { 1055 return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page); 1056 } 1057 1058 static ssize_t webusb_landingPage_store(struct config_item *item, const char *page, 1059 size_t len) 1060 { 1061 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1062 unsigned int bytes_to_strip = 0; 1063 int l = len; 1064 1065 if (page[l - 1] == '\n') { 1066 --l; 1067 ++bytes_to_strip; 1068 } 1069 1070 if (l > sizeof(gi->landing_page)) { 1071 pr_err("webusb: landingPage URL too long\n"); 1072 return -EINVAL; 1073 } 1074 1075 // validation 1076 if (strncasecmp(page, "https://", 8) == 0) 1077 bytes_to_strip = 8; 1078 else if (strncasecmp(page, "http://", 7) == 0) 1079 bytes_to_strip = 7; 1080 else 1081 bytes_to_strip = 0; 1082 1083 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) { 1084 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n", 1085 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip); 1086 return -EINVAL; 1087 } 1088 1089 mutex_lock(&gi->lock); 1090 // ensure 0 bytes are set, in case the new landing page is shorter then the old one. 1091 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0); 1092 mutex_unlock(&gi->lock); 1093 1094 return len; 1095 } 1096 1097 CONFIGFS_ATTR(webusb_, use); 1098 CONFIGFS_ATTR(webusb_, bVendorCode); 1099 CONFIGFS_ATTR(webusb_, bcdVersion); 1100 CONFIGFS_ATTR(webusb_, landingPage); 1101 1102 static struct configfs_attribute *webusb_attrs[] = { 1103 &webusb_attr_use, 1104 &webusb_attr_bcdVersion, 1105 &webusb_attr_bVendorCode, 1106 &webusb_attr_landingPage, 1107 NULL, 1108 }; 1109 1110 static struct config_item_type webusb_type = { 1111 .ct_attrs = webusb_attrs, 1112 .ct_owner = THIS_MODULE, 1113 }; 1114 1115 static inline struct gadget_info *os_desc_item_to_gadget_info( 1116 struct config_item *item) 1117 { 1118 return container_of(to_config_group(item), 1119 struct gadget_info, os_desc_group); 1120 } 1121 1122 static ssize_t os_desc_use_show(struct config_item *item, char *page) 1123 { 1124 return sprintf(page, "%d\n", 1125 os_desc_item_to_gadget_info(item)->use_os_desc); 1126 } 1127 1128 static ssize_t os_desc_use_store(struct config_item *item, const char *page, 1129 size_t len) 1130 { 1131 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1132 int ret; 1133 bool use; 1134 1135 ret = kstrtobool(page, &use); 1136 if (ret) 1137 return ret; 1138 1139 mutex_lock(&gi->lock); 1140 gi->use_os_desc = use; 1141 mutex_unlock(&gi->lock); 1142 1143 return len; 1144 } 1145 1146 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 1147 { 1148 return sprintf(page, "0x%02x\n", 1149 os_desc_item_to_gadget_info(item)->b_vendor_code); 1150 } 1151 1152 static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 1153 const char *page, size_t len) 1154 { 1155 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1156 int ret; 1157 u8 b_vendor_code; 1158 1159 ret = kstrtou8(page, 0, &b_vendor_code); 1160 if (ret) 1161 return ret; 1162 1163 mutex_lock(&gi->lock); 1164 gi->b_vendor_code = b_vendor_code; 1165 mutex_unlock(&gi->lock); 1166 1167 return len; 1168 } 1169 1170 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 1171 { 1172 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1173 int res; 1174 1175 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 1176 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 1177 page[res++] = '\n'; 1178 1179 return res; 1180 } 1181 1182 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 1183 size_t len) 1184 { 1185 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1186 int res, l; 1187 1188 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); 1189 if (page[l - 1] == '\n') 1190 --l; 1191 1192 mutex_lock(&gi->lock); 1193 res = utf8s_to_utf16s(page, l, 1194 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 1195 OS_STRING_QW_SIGN_LEN); 1196 if (res > 0) 1197 res = len; 1198 mutex_unlock(&gi->lock); 1199 1200 return res; 1201 } 1202 1203 CONFIGFS_ATTR(os_desc_, use); 1204 CONFIGFS_ATTR(os_desc_, b_vendor_code); 1205 CONFIGFS_ATTR(os_desc_, qw_sign); 1206 1207 static struct configfs_attribute *os_desc_attrs[] = { 1208 &os_desc_attr_use, 1209 &os_desc_attr_b_vendor_code, 1210 &os_desc_attr_qw_sign, 1211 NULL, 1212 }; 1213 1214 static int os_desc_link(struct config_item *os_desc_ci, 1215 struct config_item *usb_cfg_ci) 1216 { 1217 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1218 struct usb_composite_dev *cdev = &gi->cdev; 1219 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 1220 struct usb_configuration *c = NULL, *iter; 1221 int ret; 1222 1223 mutex_lock(&gi->lock); 1224 list_for_each_entry(iter, &cdev->configs, list) { 1225 if (iter != &c_target->c) 1226 continue; 1227 c = iter; 1228 break; 1229 } 1230 if (!c) { 1231 ret = -EINVAL; 1232 goto out; 1233 } 1234 1235 if (cdev->os_desc_config) { 1236 ret = -EBUSY; 1237 goto out; 1238 } 1239 1240 cdev->os_desc_config = &c_target->c; 1241 ret = 0; 1242 1243 out: 1244 mutex_unlock(&gi->lock); 1245 return ret; 1246 } 1247 1248 static void os_desc_unlink(struct config_item *os_desc_ci, 1249 struct config_item *usb_cfg_ci) 1250 { 1251 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1252 struct usb_composite_dev *cdev = &gi->cdev; 1253 1254 mutex_lock(&gi->lock); 1255 if (gi->composite.gadget_driver.udc_name) 1256 unregister_gadget(gi); 1257 cdev->os_desc_config = NULL; 1258 WARN_ON(gi->composite.gadget_driver.udc_name); 1259 mutex_unlock(&gi->lock); 1260 } 1261 1262 static struct configfs_item_operations os_desc_ops = { 1263 .allow_link = os_desc_link, 1264 .drop_link = os_desc_unlink, 1265 }; 1266 1267 static struct config_item_type os_desc_type = { 1268 .ct_item_ops = &os_desc_ops, 1269 .ct_attrs = os_desc_attrs, 1270 .ct_owner = THIS_MODULE, 1271 }; 1272 1273 static inline struct usb_os_desc_ext_prop 1274 *to_usb_os_desc_ext_prop(struct config_item *item) 1275 { 1276 return container_of(item, struct usb_os_desc_ext_prop, item); 1277 } 1278 1279 static ssize_t ext_prop_type_show(struct config_item *item, char *page) 1280 { 1281 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 1282 } 1283 1284 static ssize_t ext_prop_type_store(struct config_item *item, 1285 const char *page, size_t len) 1286 { 1287 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1288 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1289 u8 type; 1290 int ret; 1291 1292 ret = kstrtou8(page, 0, &type); 1293 if (ret) 1294 return ret; 1295 1296 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) 1297 return -EINVAL; 1298 1299 if (desc->opts_mutex) 1300 mutex_lock(desc->opts_mutex); 1301 1302 if ((ext_prop->type == USB_EXT_PROP_BINARY || 1303 ext_prop->type == USB_EXT_PROP_LE32 || 1304 ext_prop->type == USB_EXT_PROP_BE32) && 1305 (type == USB_EXT_PROP_UNICODE || 1306 type == USB_EXT_PROP_UNICODE_ENV || 1307 type == USB_EXT_PROP_UNICODE_LINK)) 1308 ext_prop->data_len <<= 1; 1309 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 1310 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1311 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 1312 (type == USB_EXT_PROP_BINARY || 1313 type == USB_EXT_PROP_LE32 || 1314 type == USB_EXT_PROP_BE32)) 1315 ext_prop->data_len >>= 1; 1316 ext_prop->type = type; 1317 1318 if (desc->opts_mutex) 1319 mutex_unlock(desc->opts_mutex); 1320 return len; 1321 } 1322 1323 static ssize_t ext_prop_data_show(struct config_item *item, char *page) 1324 { 1325 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1326 int len = ext_prop->data_len; 1327 1328 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1329 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1330 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1331 len >>= 1; 1332 memcpy(page, ext_prop->data, len); 1333 1334 return len; 1335 } 1336 1337 static ssize_t ext_prop_data_store(struct config_item *item, 1338 const char *page, size_t len) 1339 { 1340 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1341 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1342 char *new_data; 1343 size_t ret_len = len; 1344 1345 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1346 --len; 1347 new_data = kmemdup(page, len, GFP_KERNEL); 1348 if (!new_data) 1349 return -ENOMEM; 1350 1351 if (desc->opts_mutex) 1352 mutex_lock(desc->opts_mutex); 1353 kfree(ext_prop->data); 1354 ext_prop->data = new_data; 1355 desc->ext_prop_len -= ext_prop->data_len; 1356 ext_prop->data_len = len; 1357 desc->ext_prop_len += ext_prop->data_len; 1358 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1359 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1360 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1361 desc->ext_prop_len -= ext_prop->data_len; 1362 ext_prop->data_len <<= 1; 1363 ext_prop->data_len += 2; 1364 desc->ext_prop_len += ext_prop->data_len; 1365 } 1366 if (desc->opts_mutex) 1367 mutex_unlock(desc->opts_mutex); 1368 return ret_len; 1369 } 1370 1371 CONFIGFS_ATTR(ext_prop_, type); 1372 CONFIGFS_ATTR(ext_prop_, data); 1373 1374 static struct configfs_attribute *ext_prop_attrs[] = { 1375 &ext_prop_attr_type, 1376 &ext_prop_attr_data, 1377 NULL, 1378 }; 1379 1380 static void usb_os_desc_ext_prop_release(struct config_item *item) 1381 { 1382 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1383 1384 kfree(ext_prop); /* frees a whole chunk */ 1385 } 1386 1387 static struct configfs_item_operations ext_prop_ops = { 1388 .release = usb_os_desc_ext_prop_release, 1389 }; 1390 1391 static struct config_item *ext_prop_make( 1392 struct config_group *group, 1393 const char *name) 1394 { 1395 struct usb_os_desc_ext_prop *ext_prop; 1396 struct config_item_type *ext_prop_type; 1397 struct usb_os_desc *desc; 1398 char *vlabuf; 1399 1400 vla_group(data_chunk); 1401 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1402 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1403 1404 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1405 if (!vlabuf) 1406 return ERR_PTR(-ENOMEM); 1407 1408 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1409 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1410 1411 desc = container_of(group, struct usb_os_desc, group); 1412 ext_prop_type->ct_item_ops = &ext_prop_ops; 1413 ext_prop_type->ct_attrs = ext_prop_attrs; 1414 ext_prop_type->ct_owner = desc->owner; 1415 1416 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1417 1418 ext_prop->name = kstrdup(name, GFP_KERNEL); 1419 if (!ext_prop->name) { 1420 kfree(vlabuf); 1421 return ERR_PTR(-ENOMEM); 1422 } 1423 desc->ext_prop_len += 14; 1424 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1425 if (desc->opts_mutex) 1426 mutex_lock(desc->opts_mutex); 1427 desc->ext_prop_len += ext_prop->name_len; 1428 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1429 ++desc->ext_prop_count; 1430 if (desc->opts_mutex) 1431 mutex_unlock(desc->opts_mutex); 1432 1433 return &ext_prop->item; 1434 } 1435 1436 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1437 { 1438 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1439 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1440 1441 if (desc->opts_mutex) 1442 mutex_lock(desc->opts_mutex); 1443 list_del(&ext_prop->entry); 1444 --desc->ext_prop_count; 1445 kfree(ext_prop->name); 1446 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1447 if (desc->opts_mutex) 1448 mutex_unlock(desc->opts_mutex); 1449 config_item_put(item); 1450 } 1451 1452 static struct configfs_group_operations interf_grp_ops = { 1453 .make_item = &ext_prop_make, 1454 .drop_item = &ext_prop_drop, 1455 }; 1456 1457 static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1458 char *page) 1459 { 1460 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1461 return 8; 1462 } 1463 1464 static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1465 const char *page, size_t len) 1466 { 1467 struct usb_os_desc *desc = to_usb_os_desc(item); 1468 int l; 1469 1470 l = min_t(int, 8, len); 1471 if (page[l - 1] == '\n') 1472 --l; 1473 if (desc->opts_mutex) 1474 mutex_lock(desc->opts_mutex); 1475 memcpy(desc->ext_compat_id, page, l); 1476 1477 if (desc->opts_mutex) 1478 mutex_unlock(desc->opts_mutex); 1479 1480 return len; 1481 } 1482 1483 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1484 char *page) 1485 { 1486 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1487 return 8; 1488 } 1489 1490 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1491 const char *page, size_t len) 1492 { 1493 struct usb_os_desc *desc = to_usb_os_desc(item); 1494 int l; 1495 1496 l = min_t(int, 8, len); 1497 if (page[l - 1] == '\n') 1498 --l; 1499 if (desc->opts_mutex) 1500 mutex_lock(desc->opts_mutex); 1501 memcpy(desc->ext_compat_id + 8, page, l); 1502 1503 if (desc->opts_mutex) 1504 mutex_unlock(desc->opts_mutex); 1505 1506 return len; 1507 } 1508 1509 CONFIGFS_ATTR(interf_grp_, compatible_id); 1510 CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1511 1512 static struct configfs_attribute *interf_grp_attrs[] = { 1513 &interf_grp_attr_compatible_id, 1514 &interf_grp_attr_sub_compatible_id, 1515 NULL 1516 }; 1517 1518 struct config_group *usb_os_desc_prepare_interf_dir( 1519 struct config_group *parent, 1520 int n_interf, 1521 struct usb_os_desc **desc, 1522 char **names, 1523 struct module *owner) 1524 { 1525 struct config_group *os_desc_group; 1526 struct config_item_type *os_desc_type, *interface_type; 1527 1528 vla_group(data_chunk); 1529 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1530 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1531 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1532 1533 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1534 if (!vlabuf) 1535 return ERR_PTR(-ENOMEM); 1536 1537 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1538 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1539 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1540 1541 os_desc_type->ct_owner = owner; 1542 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1543 configfs_add_default_group(os_desc_group, parent); 1544 1545 interface_type->ct_group_ops = &interf_grp_ops; 1546 interface_type->ct_attrs = interf_grp_attrs; 1547 interface_type->ct_owner = owner; 1548 1549 while (n_interf--) { 1550 struct usb_os_desc *d; 1551 1552 d = desc[n_interf]; 1553 d->owner = owner; 1554 config_group_init_type_name(&d->group, "", interface_type); 1555 config_item_set_name(&d->group.cg_item, "interface.%s", 1556 names[n_interf]); 1557 configfs_add_default_group(&d->group, os_desc_group); 1558 } 1559 1560 return os_desc_group; 1561 } 1562 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1563 1564 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1565 { 1566 WARN_ON(1); 1567 return -EINVAL; 1568 } 1569 1570 int composite_dev_prepare(struct usb_composite_driver *composite, 1571 struct usb_composite_dev *dev); 1572 1573 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1574 struct usb_ep *ep0); 1575 1576 static void purge_configs_funcs(struct gadget_info *gi) 1577 { 1578 struct usb_configuration *c; 1579 1580 list_for_each_entry(c, &gi->cdev.configs, list) { 1581 struct usb_function *f, *tmp; 1582 struct config_usb_cfg *cfg; 1583 1584 cfg = container_of(c, struct config_usb_cfg, c); 1585 1586 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1587 1588 list_move(&f->list, &cfg->func_list); 1589 if (f->unbind) { 1590 dev_dbg(&gi->cdev.gadget->dev, 1591 "unbind function '%s'/%p\n", 1592 f->name, f); 1593 f->unbind(c, f); 1594 } 1595 } 1596 c->next_interface_id = 0; 1597 memset(c->interface, 0, sizeof(c->interface)); 1598 c->superspeed_plus = 0; 1599 c->superspeed = 0; 1600 c->highspeed = 0; 1601 c->fullspeed = 0; 1602 } 1603 } 1604 1605 static struct usb_string * 1606 configfs_attach_gadget_strings(struct gadget_info *gi) 1607 { 1608 struct usb_gadget_strings **gadget_strings; 1609 struct gadget_language *language; 1610 struct gadget_string *string; 1611 unsigned int nlangs = 0; 1612 struct list_head *iter; 1613 struct usb_string *us; 1614 unsigned int i = 0; 1615 int nstrings = -1; 1616 unsigned int j; 1617 1618 list_for_each(iter, &gi->string_list) 1619 nlangs++; 1620 1621 /* Bail out early if no languages are configured */ 1622 if (!nlangs) 1623 return NULL; 1624 1625 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */ 1626 sizeof(struct usb_gadget_strings *), GFP_KERNEL); 1627 if (!gadget_strings) 1628 return ERR_PTR(-ENOMEM); 1629 1630 list_for_each_entry(language, &gi->string_list, list) { 1631 struct usb_string *stringtab; 1632 1633 if (nstrings == -1) { 1634 nstrings = language->nstrings; 1635 } else if (nstrings != language->nstrings) { 1636 pr_err("languages must contain the same number of strings\n"); 1637 us = ERR_PTR(-EINVAL); 1638 goto cleanup; 1639 } 1640 1641 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string), 1642 GFP_KERNEL); 1643 if (!stringtab) { 1644 us = ERR_PTR(-ENOMEM); 1645 goto cleanup; 1646 } 1647 1648 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX; 1649 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer; 1650 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX; 1651 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product; 1652 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX; 1653 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber; 1654 1655 j = USB_GADGET_FIRST_AVAIL_IDX; 1656 list_for_each_entry(string, &language->gadget_strings, list) { 1657 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string)); 1658 j++; 1659 } 1660 1661 language->stringtab_dev.strings = stringtab; 1662 gadget_strings[i] = &language->stringtab_dev; 1663 i++; 1664 } 1665 1666 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings); 1667 1668 cleanup: 1669 list_for_each_entry(language, &gi->string_list, list) { 1670 kfree(language->stringtab_dev.strings); 1671 language->stringtab_dev.strings = NULL; 1672 } 1673 1674 kfree(gadget_strings); 1675 1676 return us; 1677 } 1678 1679 static int configfs_composite_bind(struct usb_gadget *gadget, 1680 struct usb_gadget_driver *gdriver) 1681 { 1682 struct usb_composite_driver *composite = to_cdriver(gdriver); 1683 struct gadget_info *gi = container_of(composite, 1684 struct gadget_info, composite); 1685 struct usb_composite_dev *cdev = &gi->cdev; 1686 struct usb_configuration *c; 1687 struct usb_string *s; 1688 unsigned i; 1689 int ret; 1690 1691 /* the gi->lock is hold by the caller */ 1692 gi->unbind = 0; 1693 cdev->gadget = gadget; 1694 set_gadget_data(gadget, cdev); 1695 ret = composite_dev_prepare(composite, cdev); 1696 if (ret) 1697 return ret; 1698 /* and now the gadget bind */ 1699 ret = -EINVAL; 1700 1701 if (list_empty(&gi->cdev.configs)) { 1702 pr_err("Need at least one configuration in %s.\n", 1703 gi->composite.name); 1704 goto err_comp_cleanup; 1705 } 1706 1707 1708 list_for_each_entry(c, &gi->cdev.configs, list) { 1709 struct config_usb_cfg *cfg; 1710 1711 cfg = container_of(c, struct config_usb_cfg, c); 1712 if (list_empty(&cfg->func_list)) { 1713 pr_err("Config %s/%d of %s needs at least one function.\n", 1714 c->label, c->bConfigurationValue, 1715 gi->composite.name); 1716 goto err_comp_cleanup; 1717 } 1718 } 1719 1720 /* init all strings */ 1721 if (!list_empty(&gi->string_list)) { 1722 s = configfs_attach_gadget_strings(gi); 1723 if (IS_ERR(s)) { 1724 ret = PTR_ERR(s); 1725 goto err_comp_cleanup; 1726 } 1727 1728 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1729 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1730 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1731 1732 gi->cdev.usb_strings = s; 1733 } 1734 1735 if (gi->use_webusb) { 1736 cdev->use_webusb = true; 1737 cdev->bcd_webusb_version = gi->bcd_webusb_version; 1738 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code; 1739 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH); 1740 } 1741 1742 if (gi->use_os_desc) { 1743 cdev->use_os_string = true; 1744 cdev->b_vendor_code = gi->b_vendor_code; 1745 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1746 } 1747 1748 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1749 struct usb_descriptor_header *usb_desc; 1750 1751 usb_desc = usb_otg_descriptor_alloc(gadget); 1752 if (!usb_desc) { 1753 ret = -ENOMEM; 1754 goto err_comp_cleanup; 1755 } 1756 usb_otg_descriptor_init(gadget, usb_desc); 1757 otg_desc[0] = usb_desc; 1758 otg_desc[1] = NULL; 1759 } 1760 1761 /* Go through all configs, attach all functions */ 1762 list_for_each_entry(c, &gi->cdev.configs, list) { 1763 struct config_usb_cfg *cfg; 1764 struct usb_function *f; 1765 struct usb_function *tmp; 1766 struct gadget_config_name *cn; 1767 1768 if (gadget_is_otg(gadget)) 1769 c->descriptors = otg_desc; 1770 1771 /* Properly configure the bmAttributes wakeup bit */ 1772 check_remote_wakeup_config(gadget, c); 1773 1774 cfg = container_of(c, struct config_usb_cfg, c); 1775 if (!list_empty(&cfg->string_list)) { 1776 i = 0; 1777 list_for_each_entry(cn, &cfg->string_list, list) { 1778 cfg->gstrings[i] = &cn->stringtab_dev; 1779 cn->stringtab_dev.strings = &cn->strings; 1780 cn->strings.s = cn->configuration; 1781 i++; 1782 } 1783 cfg->gstrings[i] = NULL; 1784 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1785 if (IS_ERR(s)) { 1786 ret = PTR_ERR(s); 1787 goto err_comp_cleanup; 1788 } 1789 c->iConfiguration = s[0].id; 1790 } 1791 1792 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1793 list_del(&f->list); 1794 ret = usb_add_function(c, f); 1795 if (ret) { 1796 list_add(&f->list, &cfg->func_list); 1797 goto err_purge_funcs; 1798 } 1799 } 1800 ret = usb_gadget_check_config(cdev->gadget); 1801 if (ret) 1802 goto err_purge_funcs; 1803 1804 usb_ep_autoconfig_reset(cdev->gadget); 1805 } 1806 if (cdev->use_os_string) { 1807 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1808 if (ret) 1809 goto err_purge_funcs; 1810 } 1811 1812 usb_ep_autoconfig_reset(cdev->gadget); 1813 return 0; 1814 1815 err_purge_funcs: 1816 purge_configs_funcs(gi); 1817 err_comp_cleanup: 1818 composite_dev_cleanup(cdev); 1819 return ret; 1820 } 1821 1822 static void configfs_composite_unbind(struct usb_gadget *gadget) 1823 { 1824 struct usb_composite_dev *cdev; 1825 struct gadget_info *gi; 1826 unsigned long flags; 1827 1828 /* the gi->lock is hold by the caller */ 1829 1830 cdev = get_gadget_data(gadget); 1831 gi = container_of(cdev, struct gadget_info, cdev); 1832 spin_lock_irqsave(&gi->spinlock, flags); 1833 gi->unbind = 1; 1834 spin_unlock_irqrestore(&gi->spinlock, flags); 1835 1836 kfree(otg_desc[0]); 1837 otg_desc[0] = NULL; 1838 purge_configs_funcs(gi); 1839 composite_dev_cleanup(cdev); 1840 usb_ep_autoconfig_reset(cdev->gadget); 1841 spin_lock_irqsave(&gi->spinlock, flags); 1842 cdev->gadget = NULL; 1843 cdev->deactivations = 0; 1844 gadget->deactivated = false; 1845 set_gadget_data(gadget, NULL); 1846 spin_unlock_irqrestore(&gi->spinlock, flags); 1847 } 1848 1849 static int configfs_composite_setup(struct usb_gadget *gadget, 1850 const struct usb_ctrlrequest *ctrl) 1851 { 1852 struct usb_composite_dev *cdev; 1853 struct gadget_info *gi; 1854 unsigned long flags; 1855 int ret; 1856 1857 cdev = get_gadget_data(gadget); 1858 if (!cdev) 1859 return 0; 1860 1861 gi = container_of(cdev, struct gadget_info, cdev); 1862 spin_lock_irqsave(&gi->spinlock, flags); 1863 cdev = get_gadget_data(gadget); 1864 if (!cdev || gi->unbind) { 1865 spin_unlock_irqrestore(&gi->spinlock, flags); 1866 return 0; 1867 } 1868 1869 ret = composite_setup(gadget, ctrl); 1870 spin_unlock_irqrestore(&gi->spinlock, flags); 1871 return ret; 1872 } 1873 1874 static void configfs_composite_disconnect(struct usb_gadget *gadget) 1875 { 1876 struct usb_composite_dev *cdev; 1877 struct gadget_info *gi; 1878 unsigned long flags; 1879 1880 cdev = get_gadget_data(gadget); 1881 if (!cdev) 1882 return; 1883 1884 gi = container_of(cdev, struct gadget_info, cdev); 1885 spin_lock_irqsave(&gi->spinlock, flags); 1886 cdev = get_gadget_data(gadget); 1887 if (!cdev || gi->unbind) { 1888 spin_unlock_irqrestore(&gi->spinlock, flags); 1889 return; 1890 } 1891 1892 composite_disconnect(gadget); 1893 spin_unlock_irqrestore(&gi->spinlock, flags); 1894 } 1895 1896 static void configfs_composite_reset(struct usb_gadget *gadget) 1897 { 1898 struct usb_composite_dev *cdev; 1899 struct gadget_info *gi; 1900 unsigned long flags; 1901 1902 cdev = get_gadget_data(gadget); 1903 if (!cdev) 1904 return; 1905 1906 gi = container_of(cdev, struct gadget_info, cdev); 1907 spin_lock_irqsave(&gi->spinlock, flags); 1908 cdev = get_gadget_data(gadget); 1909 if (!cdev || gi->unbind) { 1910 spin_unlock_irqrestore(&gi->spinlock, flags); 1911 return; 1912 } 1913 1914 composite_reset(gadget); 1915 spin_unlock_irqrestore(&gi->spinlock, flags); 1916 } 1917 1918 static void configfs_composite_suspend(struct usb_gadget *gadget) 1919 { 1920 struct usb_composite_dev *cdev; 1921 struct gadget_info *gi; 1922 unsigned long flags; 1923 1924 cdev = get_gadget_data(gadget); 1925 if (!cdev) 1926 return; 1927 1928 gi = container_of(cdev, struct gadget_info, cdev); 1929 spin_lock_irqsave(&gi->spinlock, flags); 1930 cdev = get_gadget_data(gadget); 1931 if (!cdev || gi->unbind) { 1932 spin_unlock_irqrestore(&gi->spinlock, flags); 1933 return; 1934 } 1935 1936 composite_suspend(gadget); 1937 spin_unlock_irqrestore(&gi->spinlock, flags); 1938 } 1939 1940 static void configfs_composite_resume(struct usb_gadget *gadget) 1941 { 1942 struct usb_composite_dev *cdev; 1943 struct gadget_info *gi; 1944 unsigned long flags; 1945 1946 cdev = get_gadget_data(gadget); 1947 if (!cdev) 1948 return; 1949 1950 gi = container_of(cdev, struct gadget_info, cdev); 1951 spin_lock_irqsave(&gi->spinlock, flags); 1952 cdev = get_gadget_data(gadget); 1953 if (!cdev || gi->unbind) { 1954 spin_unlock_irqrestore(&gi->spinlock, flags); 1955 return; 1956 } 1957 1958 composite_resume(gadget); 1959 spin_unlock_irqrestore(&gi->spinlock, flags); 1960 } 1961 1962 static const struct usb_gadget_driver configfs_driver_template = { 1963 .bind = configfs_composite_bind, 1964 .unbind = configfs_composite_unbind, 1965 1966 .setup = configfs_composite_setup, 1967 .reset = configfs_composite_reset, 1968 .disconnect = configfs_composite_disconnect, 1969 1970 .suspend = configfs_composite_suspend, 1971 .resume = configfs_composite_resume, 1972 1973 .max_speed = USB_SPEED_SUPER_PLUS, 1974 .driver = { 1975 .owner = THIS_MODULE, 1976 }, 1977 .match_existing_only = 1, 1978 }; 1979 1980 static struct config_group *gadgets_make( 1981 struct config_group *group, 1982 const char *name) 1983 { 1984 struct gadget_info *gi; 1985 1986 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1987 if (!gi) 1988 return ERR_PTR(-ENOMEM); 1989 1990 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1991 1992 config_group_init_type_name(&gi->functions_group, "functions", 1993 &functions_type); 1994 configfs_add_default_group(&gi->functions_group, &gi->group); 1995 1996 config_group_init_type_name(&gi->configs_group, "configs", 1997 &config_desc_type); 1998 configfs_add_default_group(&gi->configs_group, &gi->group); 1999 2000 config_group_init_type_name(&gi->strings_group, "strings", 2001 &gadget_language_strings_type); 2002 configfs_add_default_group(&gi->strings_group, &gi->group); 2003 2004 config_group_init_type_name(&gi->os_desc_group, "os_desc", 2005 &os_desc_type); 2006 configfs_add_default_group(&gi->os_desc_group, &gi->group); 2007 2008 config_group_init_type_name(&gi->webusb_group, "webusb", 2009 &webusb_type); 2010 configfs_add_default_group(&gi->webusb_group, &gi->group); 2011 2012 gi->composite.bind = configfs_do_nothing; 2013 gi->composite.unbind = configfs_do_nothing; 2014 gi->composite.suspend = NULL; 2015 gi->composite.resume = NULL; 2016 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 2017 2018 spin_lock_init(&gi->spinlock); 2019 mutex_init(&gi->lock); 2020 INIT_LIST_HEAD(&gi->string_list); 2021 INIT_LIST_HEAD(&gi->available_func); 2022 2023 composite_init_dev(&gi->cdev); 2024 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 2025 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 2026 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 2027 2028 gi->composite.gadget_driver = configfs_driver_template; 2029 2030 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL, 2031 "configfs-gadget.%s", name); 2032 if (!gi->composite.gadget_driver.driver.name) 2033 goto err; 2034 2035 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 2036 gi->composite.name = gi->composite.gadget_driver.function; 2037 2038 if (!gi->composite.gadget_driver.function) 2039 goto out_free_driver_name; 2040 2041 return &gi->group; 2042 2043 out_free_driver_name: 2044 kfree(gi->composite.gadget_driver.driver.name); 2045 err: 2046 kfree(gi); 2047 return ERR_PTR(-ENOMEM); 2048 } 2049 2050 static void gadgets_drop(struct config_group *group, struct config_item *item) 2051 { 2052 config_item_put(item); 2053 } 2054 2055 static struct configfs_group_operations gadgets_ops = { 2056 .make_group = &gadgets_make, 2057 .drop_item = &gadgets_drop, 2058 }; 2059 2060 static const struct config_item_type gadgets_type = { 2061 .ct_group_ops = &gadgets_ops, 2062 .ct_owner = THIS_MODULE, 2063 }; 2064 2065 static struct configfs_subsystem gadget_subsys = { 2066 .su_group = { 2067 .cg_item = { 2068 .ci_namebuf = "usb_gadget", 2069 .ci_type = &gadgets_type, 2070 }, 2071 }, 2072 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 2073 }; 2074 2075 void unregister_gadget_item(struct config_item *item) 2076 { 2077 struct gadget_info *gi = to_gadget_info(item); 2078 2079 mutex_lock(&gi->lock); 2080 unregister_gadget(gi); 2081 mutex_unlock(&gi->lock); 2082 } 2083 EXPORT_SYMBOL_GPL(unregister_gadget_item); 2084 2085 static int __init gadget_cfs_init(void) 2086 { 2087 int ret; 2088 2089 config_group_init(&gadget_subsys.su_group); 2090 2091 ret = configfs_register_subsystem(&gadget_subsys); 2092 return ret; 2093 } 2094 module_init(gadget_cfs_init); 2095 2096 static void __exit gadget_cfs_exit(void) 2097 { 2098 configfs_unregister_subsystem(&gadget_subsys); 2099 } 2100 module_exit(gadget_cfs_exit); 2101