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