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_strings { 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_strings *to_gadget_strings(struct config_item *item) 376 { 377 return container_of(to_config_group(item), struct gadget_strings, 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_strings, manufacturer); 772 GS_STRINGS_RW(gadget_strings, product); 773 GS_STRINGS_RW(gadget_strings, serialnumber); 774 775 static struct configfs_attribute *gadget_strings_langid_attrs[] = { 776 &gadget_strings_attr_manufacturer, 777 &gadget_strings_attr_product, 778 &gadget_strings_attr_serialnumber, 779 NULL, 780 }; 781 782 static void gadget_strings_attr_release(struct config_item *item) 783 { 784 struct gadget_strings *gs = to_gadget_strings(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_strings); 795 USB_CONFIG_STRINGS_LANG(gadget_strings, 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 memset(gi->landing_page, 0, sizeof(gi->landing_page)); 919 memcpy(gi->landing_page, page, l); 920 mutex_unlock(&gi->lock); 921 922 return len; 923 } 924 925 CONFIGFS_ATTR(webusb_, use); 926 CONFIGFS_ATTR(webusb_, bVendorCode); 927 CONFIGFS_ATTR(webusb_, bcdVersion); 928 CONFIGFS_ATTR(webusb_, landingPage); 929 930 static struct configfs_attribute *webusb_attrs[] = { 931 &webusb_attr_use, 932 &webusb_attr_bcdVersion, 933 &webusb_attr_bVendorCode, 934 &webusb_attr_landingPage, 935 NULL, 936 }; 937 938 static struct config_item_type webusb_type = { 939 .ct_attrs = webusb_attrs, 940 .ct_owner = THIS_MODULE, 941 }; 942 943 static inline struct gadget_info *os_desc_item_to_gadget_info( 944 struct config_item *item) 945 { 946 return container_of(to_config_group(item), 947 struct gadget_info, os_desc_group); 948 } 949 950 static ssize_t os_desc_use_show(struct config_item *item, char *page) 951 { 952 return sprintf(page, "%d\n", 953 os_desc_item_to_gadget_info(item)->use_os_desc); 954 } 955 956 static ssize_t os_desc_use_store(struct config_item *item, const char *page, 957 size_t len) 958 { 959 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 960 int ret; 961 bool use; 962 963 ret = kstrtobool(page, &use); 964 if (ret) 965 return ret; 966 967 mutex_lock(&gi->lock); 968 gi->use_os_desc = use; 969 mutex_unlock(&gi->lock); 970 971 return len; 972 } 973 974 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 975 { 976 return sprintf(page, "0x%02x\n", 977 os_desc_item_to_gadget_info(item)->b_vendor_code); 978 } 979 980 static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 981 const char *page, size_t len) 982 { 983 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 984 int ret; 985 u8 b_vendor_code; 986 987 ret = kstrtou8(page, 0, &b_vendor_code); 988 if (ret) 989 return ret; 990 991 mutex_lock(&gi->lock); 992 gi->b_vendor_code = b_vendor_code; 993 mutex_unlock(&gi->lock); 994 995 return len; 996 } 997 998 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 999 { 1000 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1001 int res; 1002 1003 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 1004 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 1005 page[res++] = '\n'; 1006 1007 return res; 1008 } 1009 1010 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 1011 size_t len) 1012 { 1013 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1014 int res, l; 1015 1016 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); 1017 if (page[l - 1] == '\n') 1018 --l; 1019 1020 mutex_lock(&gi->lock); 1021 res = utf8s_to_utf16s(page, l, 1022 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 1023 OS_STRING_QW_SIGN_LEN); 1024 if (res > 0) 1025 res = len; 1026 mutex_unlock(&gi->lock); 1027 1028 return res; 1029 } 1030 1031 CONFIGFS_ATTR(os_desc_, use); 1032 CONFIGFS_ATTR(os_desc_, b_vendor_code); 1033 CONFIGFS_ATTR(os_desc_, qw_sign); 1034 1035 static struct configfs_attribute *os_desc_attrs[] = { 1036 &os_desc_attr_use, 1037 &os_desc_attr_b_vendor_code, 1038 &os_desc_attr_qw_sign, 1039 NULL, 1040 }; 1041 1042 static int os_desc_link(struct config_item *os_desc_ci, 1043 struct config_item *usb_cfg_ci) 1044 { 1045 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1046 struct usb_composite_dev *cdev = &gi->cdev; 1047 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 1048 struct usb_configuration *c = NULL, *iter; 1049 int ret; 1050 1051 mutex_lock(&gi->lock); 1052 list_for_each_entry(iter, &cdev->configs, list) { 1053 if (iter != &c_target->c) 1054 continue; 1055 c = iter; 1056 break; 1057 } 1058 if (!c) { 1059 ret = -EINVAL; 1060 goto out; 1061 } 1062 1063 if (cdev->os_desc_config) { 1064 ret = -EBUSY; 1065 goto out; 1066 } 1067 1068 cdev->os_desc_config = &c_target->c; 1069 ret = 0; 1070 1071 out: 1072 mutex_unlock(&gi->lock); 1073 return ret; 1074 } 1075 1076 static void os_desc_unlink(struct config_item *os_desc_ci, 1077 struct config_item *usb_cfg_ci) 1078 { 1079 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1080 struct usb_composite_dev *cdev = &gi->cdev; 1081 1082 mutex_lock(&gi->lock); 1083 if (gi->composite.gadget_driver.udc_name) 1084 unregister_gadget(gi); 1085 cdev->os_desc_config = NULL; 1086 WARN_ON(gi->composite.gadget_driver.udc_name); 1087 mutex_unlock(&gi->lock); 1088 } 1089 1090 static struct configfs_item_operations os_desc_ops = { 1091 .allow_link = os_desc_link, 1092 .drop_link = os_desc_unlink, 1093 }; 1094 1095 static struct config_item_type os_desc_type = { 1096 .ct_item_ops = &os_desc_ops, 1097 .ct_attrs = os_desc_attrs, 1098 .ct_owner = THIS_MODULE, 1099 }; 1100 1101 static inline struct usb_os_desc_ext_prop 1102 *to_usb_os_desc_ext_prop(struct config_item *item) 1103 { 1104 return container_of(item, struct usb_os_desc_ext_prop, item); 1105 } 1106 1107 static ssize_t ext_prop_type_show(struct config_item *item, char *page) 1108 { 1109 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 1110 } 1111 1112 static ssize_t ext_prop_type_store(struct config_item *item, 1113 const char *page, size_t len) 1114 { 1115 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1116 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1117 u8 type; 1118 int ret; 1119 1120 ret = kstrtou8(page, 0, &type); 1121 if (ret) 1122 return ret; 1123 1124 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) 1125 return -EINVAL; 1126 1127 if (desc->opts_mutex) 1128 mutex_lock(desc->opts_mutex); 1129 1130 if ((ext_prop->type == USB_EXT_PROP_BINARY || 1131 ext_prop->type == USB_EXT_PROP_LE32 || 1132 ext_prop->type == USB_EXT_PROP_BE32) && 1133 (type == USB_EXT_PROP_UNICODE || 1134 type == USB_EXT_PROP_UNICODE_ENV || 1135 type == USB_EXT_PROP_UNICODE_LINK)) 1136 ext_prop->data_len <<= 1; 1137 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 1138 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1139 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 1140 (type == USB_EXT_PROP_BINARY || 1141 type == USB_EXT_PROP_LE32 || 1142 type == USB_EXT_PROP_BE32)) 1143 ext_prop->data_len >>= 1; 1144 ext_prop->type = type; 1145 1146 if (desc->opts_mutex) 1147 mutex_unlock(desc->opts_mutex); 1148 return len; 1149 } 1150 1151 static ssize_t ext_prop_data_show(struct config_item *item, char *page) 1152 { 1153 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1154 int len = ext_prop->data_len; 1155 1156 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1157 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1158 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1159 len >>= 1; 1160 memcpy(page, ext_prop->data, len); 1161 1162 return len; 1163 } 1164 1165 static ssize_t ext_prop_data_store(struct config_item *item, 1166 const char *page, size_t len) 1167 { 1168 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1169 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1170 char *new_data; 1171 size_t ret_len = len; 1172 1173 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1174 --len; 1175 new_data = kmemdup(page, len, GFP_KERNEL); 1176 if (!new_data) 1177 return -ENOMEM; 1178 1179 if (desc->opts_mutex) 1180 mutex_lock(desc->opts_mutex); 1181 kfree(ext_prop->data); 1182 ext_prop->data = new_data; 1183 desc->ext_prop_len -= ext_prop->data_len; 1184 ext_prop->data_len = len; 1185 desc->ext_prop_len += ext_prop->data_len; 1186 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1187 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1188 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1189 desc->ext_prop_len -= ext_prop->data_len; 1190 ext_prop->data_len <<= 1; 1191 ext_prop->data_len += 2; 1192 desc->ext_prop_len += ext_prop->data_len; 1193 } 1194 if (desc->opts_mutex) 1195 mutex_unlock(desc->opts_mutex); 1196 return ret_len; 1197 } 1198 1199 CONFIGFS_ATTR(ext_prop_, type); 1200 CONFIGFS_ATTR(ext_prop_, data); 1201 1202 static struct configfs_attribute *ext_prop_attrs[] = { 1203 &ext_prop_attr_type, 1204 &ext_prop_attr_data, 1205 NULL, 1206 }; 1207 1208 static void usb_os_desc_ext_prop_release(struct config_item *item) 1209 { 1210 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1211 1212 kfree(ext_prop); /* frees a whole chunk */ 1213 } 1214 1215 static struct configfs_item_operations ext_prop_ops = { 1216 .release = usb_os_desc_ext_prop_release, 1217 }; 1218 1219 static struct config_item *ext_prop_make( 1220 struct config_group *group, 1221 const char *name) 1222 { 1223 struct usb_os_desc_ext_prop *ext_prop; 1224 struct config_item_type *ext_prop_type; 1225 struct usb_os_desc *desc; 1226 char *vlabuf; 1227 1228 vla_group(data_chunk); 1229 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1230 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1231 1232 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1233 if (!vlabuf) 1234 return ERR_PTR(-ENOMEM); 1235 1236 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1237 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1238 1239 desc = container_of(group, struct usb_os_desc, group); 1240 ext_prop_type->ct_item_ops = &ext_prop_ops; 1241 ext_prop_type->ct_attrs = ext_prop_attrs; 1242 ext_prop_type->ct_owner = desc->owner; 1243 1244 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1245 1246 ext_prop->name = kstrdup(name, GFP_KERNEL); 1247 if (!ext_prop->name) { 1248 kfree(vlabuf); 1249 return ERR_PTR(-ENOMEM); 1250 } 1251 desc->ext_prop_len += 14; 1252 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1253 if (desc->opts_mutex) 1254 mutex_lock(desc->opts_mutex); 1255 desc->ext_prop_len += ext_prop->name_len; 1256 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1257 ++desc->ext_prop_count; 1258 if (desc->opts_mutex) 1259 mutex_unlock(desc->opts_mutex); 1260 1261 return &ext_prop->item; 1262 } 1263 1264 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1265 { 1266 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1267 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1268 1269 if (desc->opts_mutex) 1270 mutex_lock(desc->opts_mutex); 1271 list_del(&ext_prop->entry); 1272 --desc->ext_prop_count; 1273 kfree(ext_prop->name); 1274 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1275 if (desc->opts_mutex) 1276 mutex_unlock(desc->opts_mutex); 1277 config_item_put(item); 1278 } 1279 1280 static struct configfs_group_operations interf_grp_ops = { 1281 .make_item = &ext_prop_make, 1282 .drop_item = &ext_prop_drop, 1283 }; 1284 1285 static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1286 char *page) 1287 { 1288 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1289 return 8; 1290 } 1291 1292 static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1293 const char *page, size_t len) 1294 { 1295 struct usb_os_desc *desc = to_usb_os_desc(item); 1296 int l; 1297 1298 l = min_t(int, 8, len); 1299 if (page[l - 1] == '\n') 1300 --l; 1301 if (desc->opts_mutex) 1302 mutex_lock(desc->opts_mutex); 1303 memcpy(desc->ext_compat_id, page, l); 1304 1305 if (desc->opts_mutex) 1306 mutex_unlock(desc->opts_mutex); 1307 1308 return len; 1309 } 1310 1311 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1312 char *page) 1313 { 1314 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1315 return 8; 1316 } 1317 1318 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1319 const char *page, size_t len) 1320 { 1321 struct usb_os_desc *desc = to_usb_os_desc(item); 1322 int l; 1323 1324 l = min_t(int, 8, len); 1325 if (page[l - 1] == '\n') 1326 --l; 1327 if (desc->opts_mutex) 1328 mutex_lock(desc->opts_mutex); 1329 memcpy(desc->ext_compat_id + 8, page, l); 1330 1331 if (desc->opts_mutex) 1332 mutex_unlock(desc->opts_mutex); 1333 1334 return len; 1335 } 1336 1337 CONFIGFS_ATTR(interf_grp_, compatible_id); 1338 CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1339 1340 static struct configfs_attribute *interf_grp_attrs[] = { 1341 &interf_grp_attr_compatible_id, 1342 &interf_grp_attr_sub_compatible_id, 1343 NULL 1344 }; 1345 1346 struct config_group *usb_os_desc_prepare_interf_dir( 1347 struct config_group *parent, 1348 int n_interf, 1349 struct usb_os_desc **desc, 1350 char **names, 1351 struct module *owner) 1352 { 1353 struct config_group *os_desc_group; 1354 struct config_item_type *os_desc_type, *interface_type; 1355 1356 vla_group(data_chunk); 1357 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1358 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1359 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1360 1361 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1362 if (!vlabuf) 1363 return ERR_PTR(-ENOMEM); 1364 1365 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1366 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1367 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1368 1369 os_desc_type->ct_owner = owner; 1370 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1371 configfs_add_default_group(os_desc_group, parent); 1372 1373 interface_type->ct_group_ops = &interf_grp_ops; 1374 interface_type->ct_attrs = interf_grp_attrs; 1375 interface_type->ct_owner = owner; 1376 1377 while (n_interf--) { 1378 struct usb_os_desc *d; 1379 1380 d = desc[n_interf]; 1381 d->owner = owner; 1382 config_group_init_type_name(&d->group, "", interface_type); 1383 config_item_set_name(&d->group.cg_item, "interface.%s", 1384 names[n_interf]); 1385 configfs_add_default_group(&d->group, os_desc_group); 1386 } 1387 1388 return os_desc_group; 1389 } 1390 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1391 1392 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1393 { 1394 WARN_ON(1); 1395 return -EINVAL; 1396 } 1397 1398 int composite_dev_prepare(struct usb_composite_driver *composite, 1399 struct usb_composite_dev *dev); 1400 1401 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1402 struct usb_ep *ep0); 1403 1404 static void purge_configs_funcs(struct gadget_info *gi) 1405 { 1406 struct usb_configuration *c; 1407 1408 list_for_each_entry(c, &gi->cdev.configs, list) { 1409 struct usb_function *f, *tmp; 1410 struct config_usb_cfg *cfg; 1411 1412 cfg = container_of(c, struct config_usb_cfg, c); 1413 1414 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1415 1416 list_move(&f->list, &cfg->func_list); 1417 if (f->unbind) { 1418 dev_dbg(&gi->cdev.gadget->dev, 1419 "unbind function '%s'/%p\n", 1420 f->name, f); 1421 f->unbind(c, f); 1422 } 1423 } 1424 c->next_interface_id = 0; 1425 memset(c->interface, 0, sizeof(c->interface)); 1426 c->superspeed_plus = 0; 1427 c->superspeed = 0; 1428 c->highspeed = 0; 1429 c->fullspeed = 0; 1430 } 1431 } 1432 1433 static int configfs_composite_bind(struct usb_gadget *gadget, 1434 struct usb_gadget_driver *gdriver) 1435 { 1436 struct usb_composite_driver *composite = to_cdriver(gdriver); 1437 struct gadget_info *gi = container_of(composite, 1438 struct gadget_info, composite); 1439 struct usb_composite_dev *cdev = &gi->cdev; 1440 struct usb_configuration *c; 1441 struct usb_string *s; 1442 unsigned i; 1443 int ret; 1444 1445 /* the gi->lock is hold by the caller */ 1446 gi->unbind = 0; 1447 cdev->gadget = gadget; 1448 set_gadget_data(gadget, cdev); 1449 ret = composite_dev_prepare(composite, cdev); 1450 if (ret) 1451 return ret; 1452 /* and now the gadget bind */ 1453 ret = -EINVAL; 1454 1455 if (list_empty(&gi->cdev.configs)) { 1456 pr_err("Need at least one configuration in %s.\n", 1457 gi->composite.name); 1458 goto err_comp_cleanup; 1459 } 1460 1461 1462 list_for_each_entry(c, &gi->cdev.configs, list) { 1463 struct config_usb_cfg *cfg; 1464 1465 cfg = container_of(c, struct config_usb_cfg, c); 1466 if (list_empty(&cfg->func_list)) { 1467 pr_err("Config %s/%d of %s needs at least one function.\n", 1468 c->label, c->bConfigurationValue, 1469 gi->composite.name); 1470 goto err_comp_cleanup; 1471 } 1472 } 1473 1474 /* init all strings */ 1475 if (!list_empty(&gi->string_list)) { 1476 struct gadget_strings *gs; 1477 1478 i = 0; 1479 list_for_each_entry(gs, &gi->string_list, list) { 1480 1481 gi->gstrings[i] = &gs->stringtab_dev; 1482 gs->stringtab_dev.strings = gs->strings; 1483 gs->strings[USB_GADGET_MANUFACTURER_IDX].s = 1484 gs->manufacturer; 1485 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product; 1486 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber; 1487 i++; 1488 } 1489 gi->gstrings[i] = NULL; 1490 s = usb_gstrings_attach(&gi->cdev, gi->gstrings, 1491 USB_GADGET_FIRST_AVAIL_IDX); 1492 if (IS_ERR(s)) { 1493 ret = PTR_ERR(s); 1494 goto err_comp_cleanup; 1495 } 1496 1497 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1498 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1499 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1500 } 1501 1502 if (gi->use_webusb) { 1503 cdev->use_webusb = true; 1504 cdev->bcd_webusb_version = gi->bcd_webusb_version; 1505 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code; 1506 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH); 1507 } 1508 1509 if (gi->use_os_desc) { 1510 cdev->use_os_string = true; 1511 cdev->b_vendor_code = gi->b_vendor_code; 1512 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1513 } 1514 1515 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1516 struct usb_descriptor_header *usb_desc; 1517 1518 usb_desc = usb_otg_descriptor_alloc(gadget); 1519 if (!usb_desc) { 1520 ret = -ENOMEM; 1521 goto err_comp_cleanup; 1522 } 1523 usb_otg_descriptor_init(gadget, usb_desc); 1524 otg_desc[0] = usb_desc; 1525 otg_desc[1] = NULL; 1526 } 1527 1528 /* Go through all configs, attach all functions */ 1529 list_for_each_entry(c, &gi->cdev.configs, list) { 1530 struct config_usb_cfg *cfg; 1531 struct usb_function *f; 1532 struct usb_function *tmp; 1533 struct gadget_config_name *cn; 1534 1535 if (gadget_is_otg(gadget)) 1536 c->descriptors = otg_desc; 1537 1538 cfg = container_of(c, struct config_usb_cfg, c); 1539 if (!list_empty(&cfg->string_list)) { 1540 i = 0; 1541 list_for_each_entry(cn, &cfg->string_list, list) { 1542 cfg->gstrings[i] = &cn->stringtab_dev; 1543 cn->stringtab_dev.strings = &cn->strings; 1544 cn->strings.s = cn->configuration; 1545 i++; 1546 } 1547 cfg->gstrings[i] = NULL; 1548 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1549 if (IS_ERR(s)) { 1550 ret = PTR_ERR(s); 1551 goto err_comp_cleanup; 1552 } 1553 c->iConfiguration = s[0].id; 1554 } 1555 1556 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1557 list_del(&f->list); 1558 ret = usb_add_function(c, f); 1559 if (ret) { 1560 list_add(&f->list, &cfg->func_list); 1561 goto err_purge_funcs; 1562 } 1563 } 1564 ret = usb_gadget_check_config(cdev->gadget); 1565 if (ret) 1566 goto err_purge_funcs; 1567 1568 usb_ep_autoconfig_reset(cdev->gadget); 1569 } 1570 if (cdev->use_os_string) { 1571 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1572 if (ret) 1573 goto err_purge_funcs; 1574 } 1575 1576 usb_ep_autoconfig_reset(cdev->gadget); 1577 return 0; 1578 1579 err_purge_funcs: 1580 purge_configs_funcs(gi); 1581 err_comp_cleanup: 1582 composite_dev_cleanup(cdev); 1583 return ret; 1584 } 1585 1586 static void configfs_composite_unbind(struct usb_gadget *gadget) 1587 { 1588 struct usb_composite_dev *cdev; 1589 struct gadget_info *gi; 1590 unsigned long flags; 1591 1592 /* the gi->lock is hold by the caller */ 1593 1594 cdev = get_gadget_data(gadget); 1595 gi = container_of(cdev, struct gadget_info, cdev); 1596 spin_lock_irqsave(&gi->spinlock, flags); 1597 gi->unbind = 1; 1598 spin_unlock_irqrestore(&gi->spinlock, flags); 1599 1600 kfree(otg_desc[0]); 1601 otg_desc[0] = NULL; 1602 purge_configs_funcs(gi); 1603 composite_dev_cleanup(cdev); 1604 usb_ep_autoconfig_reset(cdev->gadget); 1605 spin_lock_irqsave(&gi->spinlock, flags); 1606 cdev->gadget = NULL; 1607 cdev->deactivations = 0; 1608 gadget->deactivated = false; 1609 set_gadget_data(gadget, NULL); 1610 spin_unlock_irqrestore(&gi->spinlock, flags); 1611 } 1612 1613 static int configfs_composite_setup(struct usb_gadget *gadget, 1614 const struct usb_ctrlrequest *ctrl) 1615 { 1616 struct usb_composite_dev *cdev; 1617 struct gadget_info *gi; 1618 unsigned long flags; 1619 int ret; 1620 1621 cdev = get_gadget_data(gadget); 1622 if (!cdev) 1623 return 0; 1624 1625 gi = container_of(cdev, struct gadget_info, cdev); 1626 spin_lock_irqsave(&gi->spinlock, flags); 1627 cdev = get_gadget_data(gadget); 1628 if (!cdev || gi->unbind) { 1629 spin_unlock_irqrestore(&gi->spinlock, flags); 1630 return 0; 1631 } 1632 1633 ret = composite_setup(gadget, ctrl); 1634 spin_unlock_irqrestore(&gi->spinlock, flags); 1635 return ret; 1636 } 1637 1638 static void configfs_composite_disconnect(struct usb_gadget *gadget) 1639 { 1640 struct usb_composite_dev *cdev; 1641 struct gadget_info *gi; 1642 unsigned long flags; 1643 1644 cdev = get_gadget_data(gadget); 1645 if (!cdev) 1646 return; 1647 1648 gi = container_of(cdev, struct gadget_info, cdev); 1649 spin_lock_irqsave(&gi->spinlock, flags); 1650 cdev = get_gadget_data(gadget); 1651 if (!cdev || gi->unbind) { 1652 spin_unlock_irqrestore(&gi->spinlock, flags); 1653 return; 1654 } 1655 1656 composite_disconnect(gadget); 1657 spin_unlock_irqrestore(&gi->spinlock, flags); 1658 } 1659 1660 static void configfs_composite_reset(struct usb_gadget *gadget) 1661 { 1662 struct usb_composite_dev *cdev; 1663 struct gadget_info *gi; 1664 unsigned long flags; 1665 1666 cdev = get_gadget_data(gadget); 1667 if (!cdev) 1668 return; 1669 1670 gi = container_of(cdev, struct gadget_info, cdev); 1671 spin_lock_irqsave(&gi->spinlock, flags); 1672 cdev = get_gadget_data(gadget); 1673 if (!cdev || gi->unbind) { 1674 spin_unlock_irqrestore(&gi->spinlock, flags); 1675 return; 1676 } 1677 1678 composite_reset(gadget); 1679 spin_unlock_irqrestore(&gi->spinlock, flags); 1680 } 1681 1682 static void configfs_composite_suspend(struct usb_gadget *gadget) 1683 { 1684 struct usb_composite_dev *cdev; 1685 struct gadget_info *gi; 1686 unsigned long flags; 1687 1688 cdev = get_gadget_data(gadget); 1689 if (!cdev) 1690 return; 1691 1692 gi = container_of(cdev, struct gadget_info, cdev); 1693 spin_lock_irqsave(&gi->spinlock, flags); 1694 cdev = get_gadget_data(gadget); 1695 if (!cdev || gi->unbind) { 1696 spin_unlock_irqrestore(&gi->spinlock, flags); 1697 return; 1698 } 1699 1700 composite_suspend(gadget); 1701 spin_unlock_irqrestore(&gi->spinlock, flags); 1702 } 1703 1704 static void configfs_composite_resume(struct usb_gadget *gadget) 1705 { 1706 struct usb_composite_dev *cdev; 1707 struct gadget_info *gi; 1708 unsigned long flags; 1709 1710 cdev = get_gadget_data(gadget); 1711 if (!cdev) 1712 return; 1713 1714 gi = container_of(cdev, struct gadget_info, cdev); 1715 spin_lock_irqsave(&gi->spinlock, flags); 1716 cdev = get_gadget_data(gadget); 1717 if (!cdev || gi->unbind) { 1718 spin_unlock_irqrestore(&gi->spinlock, flags); 1719 return; 1720 } 1721 1722 composite_resume(gadget); 1723 spin_unlock_irqrestore(&gi->spinlock, flags); 1724 } 1725 1726 static const struct usb_gadget_driver configfs_driver_template = { 1727 .bind = configfs_composite_bind, 1728 .unbind = configfs_composite_unbind, 1729 1730 .setup = configfs_composite_setup, 1731 .reset = configfs_composite_reset, 1732 .disconnect = configfs_composite_disconnect, 1733 1734 .suspend = configfs_composite_suspend, 1735 .resume = configfs_composite_resume, 1736 1737 .max_speed = USB_SPEED_SUPER_PLUS, 1738 .driver = { 1739 .owner = THIS_MODULE, 1740 }, 1741 .match_existing_only = 1, 1742 }; 1743 1744 static struct config_group *gadgets_make( 1745 struct config_group *group, 1746 const char *name) 1747 { 1748 struct gadget_info *gi; 1749 1750 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1751 if (!gi) 1752 return ERR_PTR(-ENOMEM); 1753 1754 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1755 1756 config_group_init_type_name(&gi->functions_group, "functions", 1757 &functions_type); 1758 configfs_add_default_group(&gi->functions_group, &gi->group); 1759 1760 config_group_init_type_name(&gi->configs_group, "configs", 1761 &config_desc_type); 1762 configfs_add_default_group(&gi->configs_group, &gi->group); 1763 1764 config_group_init_type_name(&gi->strings_group, "strings", 1765 &gadget_strings_strings_type); 1766 configfs_add_default_group(&gi->strings_group, &gi->group); 1767 1768 config_group_init_type_name(&gi->os_desc_group, "os_desc", 1769 &os_desc_type); 1770 configfs_add_default_group(&gi->os_desc_group, &gi->group); 1771 1772 config_group_init_type_name(&gi->webusb_group, "webusb", 1773 &webusb_type); 1774 configfs_add_default_group(&gi->webusb_group, &gi->group); 1775 1776 gi->composite.bind = configfs_do_nothing; 1777 gi->composite.unbind = configfs_do_nothing; 1778 gi->composite.suspend = NULL; 1779 gi->composite.resume = NULL; 1780 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 1781 1782 spin_lock_init(&gi->spinlock); 1783 mutex_init(&gi->lock); 1784 INIT_LIST_HEAD(&gi->string_list); 1785 INIT_LIST_HEAD(&gi->available_func); 1786 1787 composite_init_dev(&gi->cdev); 1788 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 1789 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 1790 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 1791 1792 gi->composite.gadget_driver = configfs_driver_template; 1793 1794 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL, 1795 "configfs-gadget.%s", name); 1796 if (!gi->composite.gadget_driver.driver.name) 1797 goto err; 1798 1799 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 1800 gi->composite.name = gi->composite.gadget_driver.function; 1801 1802 if (!gi->composite.gadget_driver.function) 1803 goto out_free_driver_name; 1804 1805 return &gi->group; 1806 1807 out_free_driver_name: 1808 kfree(gi->composite.gadget_driver.driver.name); 1809 err: 1810 kfree(gi); 1811 return ERR_PTR(-ENOMEM); 1812 } 1813 1814 static void gadgets_drop(struct config_group *group, struct config_item *item) 1815 { 1816 config_item_put(item); 1817 } 1818 1819 static struct configfs_group_operations gadgets_ops = { 1820 .make_group = &gadgets_make, 1821 .drop_item = &gadgets_drop, 1822 }; 1823 1824 static const struct config_item_type gadgets_type = { 1825 .ct_group_ops = &gadgets_ops, 1826 .ct_owner = THIS_MODULE, 1827 }; 1828 1829 static struct configfs_subsystem gadget_subsys = { 1830 .su_group = { 1831 .cg_item = { 1832 .ci_namebuf = "usb_gadget", 1833 .ci_type = &gadgets_type, 1834 }, 1835 }, 1836 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 1837 }; 1838 1839 void unregister_gadget_item(struct config_item *item) 1840 { 1841 struct gadget_info *gi = to_gadget_info(item); 1842 1843 mutex_lock(&gi->lock); 1844 unregister_gadget(gi); 1845 mutex_unlock(&gi->lock); 1846 } 1847 EXPORT_SYMBOL_GPL(unregister_gadget_item); 1848 1849 static int __init gadget_cfs_init(void) 1850 { 1851 int ret; 1852 1853 config_group_init(&gadget_subsys.su_group); 1854 1855 ret = configfs_register_subsystem(&gadget_subsys); 1856 return ret; 1857 } 1858 module_init(gadget_cfs_init); 1859 1860 static void __exit gadget_cfs_exit(void) 1861 { 1862 configfs_unregister_subsystem(&gadget_subsys); 1863 } 1864 module_exit(gadget_cfs_exit); 1865