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