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