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 15int 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 35static const struct usb_descriptor_header *otg_desc[2]; 36 37struct 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 64static 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 69struct 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 78static 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 84static 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 89struct gadget_language { 90 struct usb_gadget_strings stringtab_dev; 91 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX]; 92 char *manufacturer; 93 char *product; 94 char *serialnumber; 95 96 struct config_group group; 97 struct list_head list; 98 struct list_head gadget_strings; 99 unsigned int nstrings; 100}; 101 102struct gadget_config_name { 103 struct usb_gadget_strings stringtab_dev; 104 struct usb_string strings; 105 char *configuration; 106 107 struct config_group group; 108 struct list_head list; 109}; 110 111#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1) 112 113static int usb_string_copy(const char *s, char **s_copy) 114{ 115 int ret; 116 char *str; 117 char *copy = *s_copy; 118 ret = strlen(s); 119 if (ret > USB_MAX_STRING_LEN) 120 return -EOVERFLOW; 121 122 if (copy) { 123 str = copy; 124 } else { 125 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL); 126 if (!str) 127 return -ENOMEM; 128 } 129 strcpy(str, s); 130 if (str[ret - 1] == '\n') 131 str[ret - 1] = '\0'; 132 *s_copy = str; 133 return 0; 134} 135 136#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \ 137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \ 138 char *page) \ 139{ \ 140 return sprintf(page, "0x%02x\n", \ 141 to_gadget_info(item)->cdev.desc.__name); \ 142} 143 144#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \ 145static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \ 146 char *page) \ 147{ \ 148 return sprintf(page, "0x%04x\n", \ 149 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \ 150} 151 152 153#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \ 154static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \ 155 const char *page, size_t len) \ 156{ \ 157 u8 val; \ 158 int ret; \ 159 ret = kstrtou8(page, 0, &val); \ 160 if (ret) \ 161 return ret; \ 162 to_gadget_info(item)->cdev.desc._name = val; \ 163 return len; \ 164} 165 166#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \ 167static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \ 168 const char *page, size_t len) \ 169{ \ 170 u16 val; \ 171 int ret; \ 172 ret = kstrtou16(page, 0, &val); \ 173 if (ret) \ 174 return ret; \ 175 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \ 176 return len; \ 177} 178 179#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \ 180 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \ 181 GI_DEVICE_DESC_SIMPLE_W_##_type(_name) 182 183GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB); 184GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8); 185GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8); 186GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8); 187GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8); 188GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16); 189GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16); 190GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice); 191 192static ssize_t is_valid_bcd(u16 bcd_val) 193{ 194 if ((bcd_val & 0xf) > 9) 195 return -EINVAL; 196 if (((bcd_val >> 4) & 0xf) > 9) 197 return -EINVAL; 198 if (((bcd_val >> 8) & 0xf) > 9) 199 return -EINVAL; 200 if (((bcd_val >> 12) & 0xf) > 9) 201 return -EINVAL; 202 return 0; 203} 204 205static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item, 206 const char *page, size_t len) 207{ 208 u16 bcdDevice; 209 int ret; 210 211 ret = kstrtou16(page, 0, &bcdDevice); 212 if (ret) 213 return ret; 214 ret = is_valid_bcd(bcdDevice); 215 if (ret) 216 return ret; 217 218 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice); 219 return len; 220} 221 222static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item, 223 const char *page, size_t len) 224{ 225 u16 bcdUSB; 226 int ret; 227 228 ret = kstrtou16(page, 0, &bcdUSB); 229 if (ret) 230 return ret; 231 ret = is_valid_bcd(bcdUSB); 232 if (ret) 233 return ret; 234 235 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB); 236 return len; 237} 238 239static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page) 240{ 241 struct gadget_info *gi = to_gadget_info(item); 242 char *udc_name; 243 int ret; 244 245 mutex_lock(&gi->lock); 246 udc_name = gi->composite.gadget_driver.udc_name; 247 ret = sprintf(page, "%s\n", udc_name ?: ""); 248 mutex_unlock(&gi->lock); 249 250 return ret; 251} 252 253static int unregister_gadget(struct gadget_info *gi) 254{ 255 int ret; 256 257 if (!gi->composite.gadget_driver.udc_name) 258 return -ENODEV; 259 260 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver); 261 if (ret) 262 return ret; 263 kfree(gi->composite.gadget_driver.udc_name); 264 gi->composite.gadget_driver.udc_name = NULL; 265 return 0; 266} 267 268static ssize_t gadget_dev_desc_UDC_store(struct config_item *item, 269 const char *page, size_t len) 270{ 271 struct gadget_info *gi = to_gadget_info(item); 272 char *name; 273 int ret; 274 275 if (strlen(page) < len) 276 return -EOVERFLOW; 277 278 name = kstrdup(page, GFP_KERNEL); 279 if (!name) 280 return -ENOMEM; 281 if (name[len - 1] == '\n') 282 name[len - 1] = '\0'; 283 284 mutex_lock(&gi->lock); 285 286 if (!strlen(name)) { 287 ret = unregister_gadget(gi); 288 if (ret) 289 goto err; 290 kfree(name); 291 } else { 292 if (gi->composite.gadget_driver.udc_name) { 293 ret = -EBUSY; 294 goto err; 295 } 296 gi->composite.gadget_driver.udc_name = name; 297 ret = usb_gadget_register_driver(&gi->composite.gadget_driver); 298 if (ret) { 299 gi->composite.gadget_driver.udc_name = NULL; 300 goto err; 301 } 302 } 303 mutex_unlock(&gi->lock); 304 return len; 305err: 306 kfree(name); 307 mutex_unlock(&gi->lock); 308 return ret; 309} 310 311static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item, 312 char *page) 313{ 314 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed; 315 316 return sprintf(page, "%s\n", usb_speed_string(speed)); 317} 318 319static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item, 320 const char *page, size_t len) 321{ 322 struct gadget_info *gi = to_gadget_info(item); 323 324 mutex_lock(&gi->lock); 325 326 /* Prevent changing of max_speed after the driver is binded */ 327 if (gi->composite.gadget_driver.udc_name) 328 goto err; 329 330 if (strncmp(page, "super-speed-plus", 16) == 0) 331 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 332 else if (strncmp(page, "super-speed", 11) == 0) 333 gi->composite.max_speed = USB_SPEED_SUPER; 334 else if (strncmp(page, "high-speed", 10) == 0) 335 gi->composite.max_speed = USB_SPEED_HIGH; 336 else if (strncmp(page, "full-speed", 10) == 0) 337 gi->composite.max_speed = USB_SPEED_FULL; 338 else if (strncmp(page, "low-speed", 9) == 0) 339 gi->composite.max_speed = USB_SPEED_LOW; 340 else 341 goto err; 342 343 gi->composite.gadget_driver.max_speed = gi->composite.max_speed; 344 345 mutex_unlock(&gi->lock); 346 return len; 347err: 348 mutex_unlock(&gi->lock); 349 return -EINVAL; 350} 351 352CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass); 353CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass); 354CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol); 355CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0); 356CONFIGFS_ATTR(gadget_dev_desc_, idVendor); 357CONFIGFS_ATTR(gadget_dev_desc_, idProduct); 358CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice); 359CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB); 360CONFIGFS_ATTR(gadget_dev_desc_, UDC); 361CONFIGFS_ATTR(gadget_dev_desc_, max_speed); 362 363static struct configfs_attribute *gadget_root_attrs[] = { 364 &gadget_dev_desc_attr_bDeviceClass, 365 &gadget_dev_desc_attr_bDeviceSubClass, 366 &gadget_dev_desc_attr_bDeviceProtocol, 367 &gadget_dev_desc_attr_bMaxPacketSize0, 368 &gadget_dev_desc_attr_idVendor, 369 &gadget_dev_desc_attr_idProduct, 370 &gadget_dev_desc_attr_bcdDevice, 371 &gadget_dev_desc_attr_bcdUSB, 372 &gadget_dev_desc_attr_UDC, 373 &gadget_dev_desc_attr_max_speed, 374 NULL, 375}; 376 377static inline struct gadget_language *to_gadget_language(struct config_item *item) 378{ 379 return container_of(to_config_group(item), struct gadget_language, 380 group); 381} 382 383static inline struct gadget_config_name *to_gadget_config_name( 384 struct config_item *item) 385{ 386 return container_of(to_config_group(item), struct gadget_config_name, 387 group); 388} 389 390static inline struct usb_function_instance *to_usb_function_instance( 391 struct config_item *item) 392{ 393 return container_of(to_config_group(item), 394 struct usb_function_instance, group); 395} 396 397static void gadget_info_attr_release(struct config_item *item) 398{ 399 struct gadget_info *gi = to_gadget_info(item); 400 401 WARN_ON(!list_empty(&gi->cdev.configs)); 402 WARN_ON(!list_empty(&gi->string_list)); 403 WARN_ON(!list_empty(&gi->available_func)); 404 kfree(gi->composite.gadget_driver.function); 405 kfree(gi->composite.gadget_driver.driver.name); 406 kfree(gi); 407} 408 409static struct configfs_item_operations gadget_root_item_ops = { 410 .release = gadget_info_attr_release, 411}; 412 413static void gadget_config_attr_release(struct config_item *item) 414{ 415 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 416 417 WARN_ON(!list_empty(&cfg->c.functions)); 418 list_del(&cfg->c.list); 419 kfree(cfg->c.label); 420 kfree(cfg); 421} 422 423static int config_usb_cfg_link( 424 struct config_item *usb_cfg_ci, 425 struct config_item *usb_func_ci) 426{ 427 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 428 struct gadget_info *gi = cfg_to_gadget_info(cfg); 429 430 struct usb_function_instance *fi = 431 to_usb_function_instance(usb_func_ci); 432 struct usb_function_instance *a_fi = NULL, *iter; 433 struct usb_function *f; 434 int ret; 435 436 mutex_lock(&gi->lock); 437 /* 438 * Make sure this function is from within our _this_ gadget and not 439 * from another gadget or a random directory. 440 * Also a function instance can only be linked once. 441 */ 442 443 if (gi->composite.gadget_driver.udc_name) { 444 ret = -EINVAL; 445 goto out; 446 } 447 448 list_for_each_entry(iter, &gi->available_func, cfs_list) { 449 if (iter != fi) 450 continue; 451 a_fi = iter; 452 break; 453 } 454 if (!a_fi) { 455 ret = -EINVAL; 456 goto out; 457 } 458 459 list_for_each_entry(f, &cfg->func_list, list) { 460 if (f->fi == fi) { 461 ret = -EEXIST; 462 goto out; 463 } 464 } 465 466 f = usb_get_function(fi); 467 if (IS_ERR(f)) { 468 ret = PTR_ERR(f); 469 goto out; 470 } 471 472 /* stash the function until we bind it to the gadget */ 473 list_add_tail(&f->list, &cfg->func_list); 474 ret = 0; 475out: 476 mutex_unlock(&gi->lock); 477 return ret; 478} 479 480static void config_usb_cfg_unlink( 481 struct config_item *usb_cfg_ci, 482 struct config_item *usb_func_ci) 483{ 484 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 485 struct gadget_info *gi = cfg_to_gadget_info(cfg); 486 487 struct usb_function_instance *fi = 488 to_usb_function_instance(usb_func_ci); 489 struct usb_function *f; 490 491 /* 492 * ideally I would like to forbid to unlink functions while a gadget is 493 * bound to an UDC. Since this isn't possible at the moment, we simply 494 * force an unbind, the function is available here and then we can 495 * remove the function. 496 */ 497 mutex_lock(&gi->lock); 498 if (gi->composite.gadget_driver.udc_name) 499 unregister_gadget(gi); 500 WARN_ON(gi->composite.gadget_driver.udc_name); 501 502 list_for_each_entry(f, &cfg->func_list, list) { 503 if (f->fi == fi) { 504 list_del(&f->list); 505 usb_put_function(f); 506 mutex_unlock(&gi->lock); 507 return; 508 } 509 } 510 mutex_unlock(&gi->lock); 511 WARN(1, "Unable to locate function to unbind\n"); 512} 513 514static struct configfs_item_operations gadget_config_item_ops = { 515 .release = gadget_config_attr_release, 516 .allow_link = config_usb_cfg_link, 517 .drop_link = config_usb_cfg_unlink, 518}; 519 520 521static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item, 522 char *page) 523{ 524 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 525 526 return sprintf(page, "%u\n", cfg->c.MaxPower); 527} 528 529static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item, 530 const char *page, size_t len) 531{ 532 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 533 u16 val; 534 int ret; 535 ret = kstrtou16(page, 0, &val); 536 if (ret) 537 return ret; 538 if (DIV_ROUND_UP(val, 8) > 0xff) 539 return -ERANGE; 540 cfg->c.MaxPower = val; 541 return len; 542} 543 544static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item, 545 char *page) 546{ 547 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 548 549 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes); 550} 551 552static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item, 553 const char *page, size_t len) 554{ 555 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 556 u8 val; 557 int ret; 558 ret = kstrtou8(page, 0, &val); 559 if (ret) 560 return ret; 561 if (!(val & USB_CONFIG_ATT_ONE)) 562 return -EINVAL; 563 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER | 564 USB_CONFIG_ATT_WAKEUP)) 565 return -EINVAL; 566 cfg->c.bmAttributes = val; 567 return len; 568} 569 570CONFIGFS_ATTR(gadget_config_desc_, MaxPower); 571CONFIGFS_ATTR(gadget_config_desc_, bmAttributes); 572 573static struct configfs_attribute *gadget_config_attrs[] = { 574 &gadget_config_desc_attr_MaxPower, 575 &gadget_config_desc_attr_bmAttributes, 576 NULL, 577}; 578 579static const struct config_item_type gadget_config_type = { 580 .ct_item_ops = &gadget_config_item_ops, 581 .ct_attrs = gadget_config_attrs, 582 .ct_owner = THIS_MODULE, 583}; 584 585static const struct config_item_type gadget_root_type = { 586 .ct_item_ops = &gadget_root_item_ops, 587 .ct_attrs = gadget_root_attrs, 588 .ct_owner = THIS_MODULE, 589}; 590 591static void composite_init_dev(struct usb_composite_dev *cdev) 592{ 593 spin_lock_init(&cdev->lock); 594 INIT_LIST_HEAD(&cdev->configs); 595 INIT_LIST_HEAD(&cdev->gstrings); 596} 597 598static struct config_group *function_make( 599 struct config_group *group, 600 const char *name) 601{ 602 struct gadget_info *gi; 603 struct usb_function_instance *fi; 604 char buf[MAX_NAME_LEN]; 605 char *func_name; 606 char *instance_name; 607 int ret; 608 609 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 610 if (ret >= MAX_NAME_LEN) 611 return ERR_PTR(-ENAMETOOLONG); 612 613 func_name = buf; 614 instance_name = strchr(func_name, '.'); 615 if (!instance_name) { 616 pr_err("Unable to locate . in FUNC.INSTANCE\n"); 617 return ERR_PTR(-EINVAL); 618 } 619 *instance_name = '\0'; 620 instance_name++; 621 622 fi = usb_get_function_instance(func_name); 623 if (IS_ERR(fi)) 624 return ERR_CAST(fi); 625 626 ret = config_item_set_name(&fi->group.cg_item, "%s", name); 627 if (ret) { 628 usb_put_function_instance(fi); 629 return ERR_PTR(ret); 630 } 631 if (fi->set_inst_name) { 632 ret = fi->set_inst_name(fi, instance_name); 633 if (ret) { 634 usb_put_function_instance(fi); 635 return ERR_PTR(ret); 636 } 637 } 638 639 gi = container_of(group, struct gadget_info, functions_group); 640 641 mutex_lock(&gi->lock); 642 list_add_tail(&fi->cfs_list, &gi->available_func); 643 mutex_unlock(&gi->lock); 644 return &fi->group; 645} 646 647static void function_drop( 648 struct config_group *group, 649 struct config_item *item) 650{ 651 struct usb_function_instance *fi = to_usb_function_instance(item); 652 struct gadget_info *gi; 653 654 gi = container_of(group, struct gadget_info, functions_group); 655 656 mutex_lock(&gi->lock); 657 list_del(&fi->cfs_list); 658 mutex_unlock(&gi->lock); 659 config_item_put(item); 660} 661 662static struct configfs_group_operations functions_ops = { 663 .make_group = &function_make, 664 .drop_item = &function_drop, 665}; 666 667static const struct config_item_type functions_type = { 668 .ct_group_ops = &functions_ops, 669 .ct_owner = THIS_MODULE, 670}; 671 672GS_STRINGS_RW(gadget_config_name, configuration); 673 674static struct configfs_attribute *gadget_config_name_langid_attrs[] = { 675 &gadget_config_name_attr_configuration, 676 NULL, 677}; 678 679static void gadget_config_name_attr_release(struct config_item *item) 680{ 681 struct gadget_config_name *cn = to_gadget_config_name(item); 682 683 kfree(cn->configuration); 684 685 list_del(&cn->list); 686 kfree(cn); 687} 688 689USB_CONFIG_STRING_RW_OPS(gadget_config_name); 690USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg); 691 692static struct config_group *config_desc_make( 693 struct config_group *group, 694 const char *name) 695{ 696 struct gadget_info *gi; 697 struct config_usb_cfg *cfg; 698 char buf[MAX_NAME_LEN]; 699 char *num_str; 700 u8 num; 701 int ret; 702 703 gi = container_of(group, struct gadget_info, configs_group); 704 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 705 if (ret >= MAX_NAME_LEN) 706 return ERR_PTR(-ENAMETOOLONG); 707 708 num_str = strchr(buf, '.'); 709 if (!num_str) { 710 pr_err("Unable to locate . in name.bConfigurationValue\n"); 711 return ERR_PTR(-EINVAL); 712 } 713 714 *num_str = '\0'; 715 num_str++; 716 717 if (!strlen(buf)) 718 return ERR_PTR(-EINVAL); 719 720 ret = kstrtou8(num_str, 0, &num); 721 if (ret) 722 return ERR_PTR(ret); 723 724 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 725 if (!cfg) 726 return ERR_PTR(-ENOMEM); 727 cfg->c.label = kstrdup(buf, GFP_KERNEL); 728 if (!cfg->c.label) { 729 ret = -ENOMEM; 730 goto err; 731 } 732 cfg->c.bConfigurationValue = num; 733 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW; 734 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE; 735 INIT_LIST_HEAD(&cfg->string_list); 736 INIT_LIST_HEAD(&cfg->func_list); 737 738 config_group_init_type_name(&cfg->group, name, 739 &gadget_config_type); 740 741 config_group_init_type_name(&cfg->strings_group, "strings", 742 &gadget_config_name_strings_type); 743 configfs_add_default_group(&cfg->strings_group, &cfg->group); 744 745 ret = usb_add_config_only(&gi->cdev, &cfg->c); 746 if (ret) 747 goto err; 748 749 return &cfg->group; 750err: 751 kfree(cfg->c.label); 752 kfree(cfg); 753 return ERR_PTR(ret); 754} 755 756static void config_desc_drop( 757 struct config_group *group, 758 struct config_item *item) 759{ 760 config_item_put(item); 761} 762 763static struct configfs_group_operations config_desc_ops = { 764 .make_group = &config_desc_make, 765 .drop_item = &config_desc_drop, 766}; 767 768static const struct config_item_type config_desc_type = { 769 .ct_group_ops = &config_desc_ops, 770 .ct_owner = THIS_MODULE, 771}; 772 773GS_STRINGS_RW(gadget_language, manufacturer); 774GS_STRINGS_RW(gadget_language, product); 775GS_STRINGS_RW(gadget_language, serialnumber); 776 777static struct configfs_attribute *gadget_language_langid_attrs[] = { 778 &gadget_language_attr_manufacturer, 779 &gadget_language_attr_product, 780 &gadget_language_attr_serialnumber, 781 NULL, 782}; 783 784static void gadget_language_attr_release(struct config_item *item) 785{ 786 struct gadget_language *gs = to_gadget_language(item); 787 788 kfree(gs->manufacturer); 789 kfree(gs->product); 790 kfree(gs->serialnumber); 791 792 list_del(&gs->list); 793 kfree(gs); 794} 795 796static struct configfs_item_operations gadget_language_langid_item_ops = { 797 .release = gadget_language_attr_release, 798}; 799 800static ssize_t gadget_string_id_show(struct config_item *item, char *page) 801{ 802 struct gadget_string *string = to_gadget_string(item); 803 int ret; 804 805 ret = sprintf(page, "%u\n", string->usb_string.id); 806 return ret; 807} 808CONFIGFS_ATTR_RO(gadget_string_, id); 809 810static ssize_t gadget_string_s_show(struct config_item *item, char *page) 811{ 812 struct gadget_string *string = to_gadget_string(item); 813 int ret; 814 815 ret = snprintf(page, sizeof(string->string), "%s\n", string->string); 816 return ret; 817} 818 819static ssize_t gadget_string_s_store(struct config_item *item, const char *page, 820 size_t len) 821{ 822 struct gadget_string *string = to_gadget_string(item); 823 int size = min(sizeof(string->string), len + 1); 824 825 if (len > USB_MAX_STRING_LEN) 826 return -EINVAL; 827 828 return strscpy(string->string, page, size); 829} 830CONFIGFS_ATTR(gadget_string_, s); 831 832static struct configfs_attribute *gadget_string_attrs[] = { 833 &gadget_string_attr_id, 834 &gadget_string_attr_s, 835 NULL, 836}; 837 838static void gadget_string_release(struct config_item *item) 839{ 840 struct gadget_string *string = to_gadget_string(item); 841 842 kfree(string); 843} 844 845static struct configfs_item_operations gadget_string_item_ops = { 846 .release = gadget_string_release, 847}; 848 849static const struct config_item_type gadget_string_type = { 850 .ct_item_ops = &gadget_string_item_ops, 851 .ct_attrs = gadget_string_attrs, 852 .ct_owner = THIS_MODULE, 853}; 854 855static struct config_item *gadget_language_string_make(struct config_group *group, 856 const char *name) 857{ 858 struct gadget_language *language; 859 struct gadget_string *string; 860 861 language = to_gadget_language(&group->cg_item); 862 863 string = kzalloc(sizeof(*string), GFP_KERNEL); 864 if (!string) 865 return ERR_PTR(-ENOMEM); 866 867 string->usb_string.id = language->nstrings++; 868 string->usb_string.s = string->string; 869 list_add_tail(&string->list, &language->gadget_strings); 870 871 config_item_init_type_name(&string->item, name, &gadget_string_type); 872 873 return &string->item; 874} 875 876static void gadget_language_string_drop(struct config_group *group, 877 struct config_item *item) 878{ 879 struct gadget_language *language; 880 struct gadget_string *string; 881 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX; 882 883 language = to_gadget_language(&group->cg_item); 884 string = to_gadget_string(item); 885 886 list_del(&string->list); 887 language->nstrings--; 888 889 /* Reset the ids for the language's strings to guarantee a continuous set */ 890 list_for_each_entry(string, &language->gadget_strings, list) 891 string->usb_string.id = i++; 892} 893 894static struct configfs_group_operations gadget_language_langid_group_ops = { 895 .make_item = gadget_language_string_make, 896 .drop_item = gadget_language_string_drop, 897}; 898 899static struct config_item_type gadget_language_type = { 900 .ct_item_ops = &gadget_language_langid_item_ops, 901 .ct_group_ops = &gadget_language_langid_group_ops, 902 .ct_attrs = gadget_language_langid_attrs, 903 .ct_owner = THIS_MODULE, 904}; 905 906static struct config_group *gadget_language_make(struct config_group *group, 907 const char *name) 908{ 909 struct gadget_info *gi; 910 struct gadget_language *gs; 911 struct gadget_language *new; 912 int langs = 0; 913 int ret; 914 915 new = kzalloc(sizeof(*new), GFP_KERNEL); 916 if (!new) 917 return ERR_PTR(-ENOMEM); 918 919 ret = check_user_usb_string(name, &new->stringtab_dev); 920 if (ret) 921 goto err; 922 config_group_init_type_name(&new->group, name, 923 &gadget_language_type); 924 925 gi = container_of(group, struct gadget_info, strings_group); 926 ret = -EEXIST; 927 list_for_each_entry(gs, &gi->string_list, list) { 928 if (gs->stringtab_dev.language == new->stringtab_dev.language) 929 goto err; 930 langs++; 931 } 932 ret = -EOVERFLOW; 933 if (langs >= MAX_USB_STRING_LANGS) 934 goto err; 935 936 list_add_tail(&new->list, &gi->string_list); 937 INIT_LIST_HEAD(&new->gadget_strings); 938 939 /* We have the default manufacturer, product and serialnumber strings */ 940 new->nstrings = 3; 941 return &new->group; 942err: 943 kfree(new); 944 return ERR_PTR(ret); 945} 946 947static void gadget_language_drop(struct config_group *group, 948 struct config_item *item) 949{ 950 config_item_put(item); 951} 952 953static struct configfs_group_operations gadget_language_group_ops = { 954 .make_group = &gadget_language_make, 955 .drop_item = &gadget_language_drop, 956}; 957 958static struct config_item_type gadget_language_strings_type = { 959 .ct_group_ops = &gadget_language_group_ops, 960 .ct_owner = THIS_MODULE, 961}; 962 963static inline struct gadget_info *webusb_item_to_gadget_info( 964 struct config_item *item) 965{ 966 return container_of(to_config_group(item), 967 struct gadget_info, webusb_group); 968} 969 970static ssize_t webusb_use_show(struct config_item *item, char *page) 971{ 972 return sysfs_emit(page, "%d\n", 973 webusb_item_to_gadget_info(item)->use_webusb); 974} 975 976static ssize_t webusb_use_store(struct config_item *item, const char *page, 977 size_t len) 978{ 979 struct gadget_info *gi = webusb_item_to_gadget_info(item); 980 int ret; 981 bool use; 982 983 ret = kstrtobool(page, &use); 984 if (ret) 985 return ret; 986 987 mutex_lock(&gi->lock); 988 gi->use_webusb = use; 989 mutex_unlock(&gi->lock); 990 991 return len; 992} 993 994static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page) 995{ 996 return sysfs_emit(page, "0x%04x\n", 997 webusb_item_to_gadget_info(item)->bcd_webusb_version); 998} 999 1000static ssize_t webusb_bcdVersion_store(struct config_item *item, 1001 const char *page, size_t len) 1002{ 1003 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1004 u16 bcdVersion; 1005 int ret; 1006 1007 ret = kstrtou16(page, 0, &bcdVersion); 1008 if (ret) 1009 return ret; 1010 1011 ret = is_valid_bcd(bcdVersion); 1012 if (ret) 1013 return ret; 1014 1015 mutex_lock(&gi->lock); 1016 gi->bcd_webusb_version = bcdVersion; 1017 mutex_unlock(&gi->lock); 1018 1019 return len; 1020} 1021 1022static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page) 1023{ 1024 return sysfs_emit(page, "0x%02x\n", 1025 webusb_item_to_gadget_info(item)->b_webusb_vendor_code); 1026} 1027 1028static ssize_t webusb_bVendorCode_store(struct config_item *item, 1029 const char *page, size_t len) 1030{ 1031 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1032 int ret; 1033 u8 b_vendor_code; 1034 1035 ret = kstrtou8(page, 0, &b_vendor_code); 1036 if (ret) 1037 return ret; 1038 1039 mutex_lock(&gi->lock); 1040 gi->b_webusb_vendor_code = b_vendor_code; 1041 mutex_unlock(&gi->lock); 1042 1043 return len; 1044} 1045 1046static ssize_t webusb_landingPage_show(struct config_item *item, char *page) 1047{ 1048 return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page); 1049} 1050 1051static ssize_t webusb_landingPage_store(struct config_item *item, const char *page, 1052 size_t len) 1053{ 1054 struct gadget_info *gi = webusb_item_to_gadget_info(item); 1055 unsigned int bytes_to_strip = 0; 1056 int l = len; 1057 1058 if (page[l - 1] == '\n') { 1059 --l; 1060 ++bytes_to_strip; 1061 } 1062 1063 if (l > sizeof(gi->landing_page)) { 1064 pr_err("webusb: landingPage URL too long\n"); 1065 return -EINVAL; 1066 } 1067 1068 // validation 1069 if (strncasecmp(page, "https://", 8) == 0) 1070 bytes_to_strip = 8; 1071 else if (strncasecmp(page, "http://", 7) == 0) 1072 bytes_to_strip = 7; 1073 else 1074 bytes_to_strip = 0; 1075 1076 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) { 1077 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n", 1078 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip); 1079 return -EINVAL; 1080 } 1081 1082 mutex_lock(&gi->lock); 1083 // ensure 0 bytes are set, in case the new landing page is shorter then the old one. 1084 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0); 1085 mutex_unlock(&gi->lock); 1086 1087 return len; 1088} 1089 1090CONFIGFS_ATTR(webusb_, use); 1091CONFIGFS_ATTR(webusb_, bVendorCode); 1092CONFIGFS_ATTR(webusb_, bcdVersion); 1093CONFIGFS_ATTR(webusb_, landingPage); 1094 1095static struct configfs_attribute *webusb_attrs[] = { 1096 &webusb_attr_use, 1097 &webusb_attr_bcdVersion, 1098 &webusb_attr_bVendorCode, 1099 &webusb_attr_landingPage, 1100 NULL, 1101}; 1102 1103static struct config_item_type webusb_type = { 1104 .ct_attrs = webusb_attrs, 1105 .ct_owner = THIS_MODULE, 1106}; 1107 1108static inline struct gadget_info *os_desc_item_to_gadget_info( 1109 struct config_item *item) 1110{ 1111 return container_of(to_config_group(item), 1112 struct gadget_info, os_desc_group); 1113} 1114 1115static ssize_t os_desc_use_show(struct config_item *item, char *page) 1116{ 1117 return sprintf(page, "%d\n", 1118 os_desc_item_to_gadget_info(item)->use_os_desc); 1119} 1120 1121static ssize_t os_desc_use_store(struct config_item *item, const char *page, 1122 size_t len) 1123{ 1124 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1125 int ret; 1126 bool use; 1127 1128 ret = kstrtobool(page, &use); 1129 if (ret) 1130 return ret; 1131 1132 mutex_lock(&gi->lock); 1133 gi->use_os_desc = use; 1134 mutex_unlock(&gi->lock); 1135 1136 return len; 1137} 1138 1139static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 1140{ 1141 return sprintf(page, "0x%02x\n", 1142 os_desc_item_to_gadget_info(item)->b_vendor_code); 1143} 1144 1145static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 1146 const char *page, size_t len) 1147{ 1148 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1149 int ret; 1150 u8 b_vendor_code; 1151 1152 ret = kstrtou8(page, 0, &b_vendor_code); 1153 if (ret) 1154 return ret; 1155 1156 mutex_lock(&gi->lock); 1157 gi->b_vendor_code = b_vendor_code; 1158 mutex_unlock(&gi->lock); 1159 1160 return len; 1161} 1162 1163static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 1164{ 1165 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1166 int res; 1167 1168 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 1169 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 1170 page[res++] = '\n'; 1171 1172 return res; 1173} 1174 1175static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 1176 size_t len) 1177{ 1178 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 1179 int res, l; 1180 1181 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); 1182 if (page[l - 1] == '\n') 1183 --l; 1184 1185 mutex_lock(&gi->lock); 1186 res = utf8s_to_utf16s(page, l, 1187 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 1188 OS_STRING_QW_SIGN_LEN); 1189 if (res > 0) 1190 res = len; 1191 mutex_unlock(&gi->lock); 1192 1193 return res; 1194} 1195 1196CONFIGFS_ATTR(os_desc_, use); 1197CONFIGFS_ATTR(os_desc_, b_vendor_code); 1198CONFIGFS_ATTR(os_desc_, qw_sign); 1199 1200static struct configfs_attribute *os_desc_attrs[] = { 1201 &os_desc_attr_use, 1202 &os_desc_attr_b_vendor_code, 1203 &os_desc_attr_qw_sign, 1204 NULL, 1205}; 1206 1207static int os_desc_link(struct config_item *os_desc_ci, 1208 struct config_item *usb_cfg_ci) 1209{ 1210 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1211 struct usb_composite_dev *cdev = &gi->cdev; 1212 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 1213 struct usb_configuration *c = NULL, *iter; 1214 int ret; 1215 1216 mutex_lock(&gi->lock); 1217 list_for_each_entry(iter, &cdev->configs, list) { 1218 if (iter != &c_target->c) 1219 continue; 1220 c = iter; 1221 break; 1222 } 1223 if (!c) { 1224 ret = -EINVAL; 1225 goto out; 1226 } 1227 1228 if (cdev->os_desc_config) { 1229 ret = -EBUSY; 1230 goto out; 1231 } 1232 1233 cdev->os_desc_config = &c_target->c; 1234 ret = 0; 1235 1236out: 1237 mutex_unlock(&gi->lock); 1238 return ret; 1239} 1240 1241static void os_desc_unlink(struct config_item *os_desc_ci, 1242 struct config_item *usb_cfg_ci) 1243{ 1244 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 1245 struct usb_composite_dev *cdev = &gi->cdev; 1246 1247 mutex_lock(&gi->lock); 1248 if (gi->composite.gadget_driver.udc_name) 1249 unregister_gadget(gi); 1250 cdev->os_desc_config = NULL; 1251 WARN_ON(gi->composite.gadget_driver.udc_name); 1252 mutex_unlock(&gi->lock); 1253} 1254 1255static struct configfs_item_operations os_desc_ops = { 1256 .allow_link = os_desc_link, 1257 .drop_link = os_desc_unlink, 1258}; 1259 1260static struct config_item_type os_desc_type = { 1261 .ct_item_ops = &os_desc_ops, 1262 .ct_attrs = os_desc_attrs, 1263 .ct_owner = THIS_MODULE, 1264}; 1265 1266static inline struct usb_os_desc_ext_prop 1267*to_usb_os_desc_ext_prop(struct config_item *item) 1268{ 1269 return container_of(item, struct usb_os_desc_ext_prop, item); 1270} 1271 1272static ssize_t ext_prop_type_show(struct config_item *item, char *page) 1273{ 1274 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 1275} 1276 1277static ssize_t ext_prop_type_store(struct config_item *item, 1278 const char *page, size_t len) 1279{ 1280 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1281 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1282 u8 type; 1283 int ret; 1284 1285 ret = kstrtou8(page, 0, &type); 1286 if (ret) 1287 return ret; 1288 1289 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) 1290 return -EINVAL; 1291 1292 if (desc->opts_mutex) 1293 mutex_lock(desc->opts_mutex); 1294 1295 if ((ext_prop->type == USB_EXT_PROP_BINARY || 1296 ext_prop->type == USB_EXT_PROP_LE32 || 1297 ext_prop->type == USB_EXT_PROP_BE32) && 1298 (type == USB_EXT_PROP_UNICODE || 1299 type == USB_EXT_PROP_UNICODE_ENV || 1300 type == USB_EXT_PROP_UNICODE_LINK)) 1301 ext_prop->data_len <<= 1; 1302 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 1303 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1304 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 1305 (type == USB_EXT_PROP_BINARY || 1306 type == USB_EXT_PROP_LE32 || 1307 type == USB_EXT_PROP_BE32)) 1308 ext_prop->data_len >>= 1; 1309 ext_prop->type = type; 1310 1311 if (desc->opts_mutex) 1312 mutex_unlock(desc->opts_mutex); 1313 return len; 1314} 1315 1316static ssize_t ext_prop_data_show(struct config_item *item, char *page) 1317{ 1318 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1319 int len = ext_prop->data_len; 1320 1321 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1322 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1323 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1324 len >>= 1; 1325 memcpy(page, ext_prop->data, len); 1326 1327 return len; 1328} 1329 1330static ssize_t ext_prop_data_store(struct config_item *item, 1331 const char *page, size_t len) 1332{ 1333 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1334 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1335 char *new_data; 1336 size_t ret_len = len; 1337 1338 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1339 --len; 1340 new_data = kmemdup(page, len, GFP_KERNEL); 1341 if (!new_data) 1342 return -ENOMEM; 1343 1344 if (desc->opts_mutex) 1345 mutex_lock(desc->opts_mutex); 1346 kfree(ext_prop->data); 1347 ext_prop->data = new_data; 1348 desc->ext_prop_len -= ext_prop->data_len; 1349 ext_prop->data_len = len; 1350 desc->ext_prop_len += ext_prop->data_len; 1351 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1352 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1353 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1354 desc->ext_prop_len -= ext_prop->data_len; 1355 ext_prop->data_len <<= 1; 1356 ext_prop->data_len += 2; 1357 desc->ext_prop_len += ext_prop->data_len; 1358 } 1359 if (desc->opts_mutex) 1360 mutex_unlock(desc->opts_mutex); 1361 return ret_len; 1362} 1363 1364CONFIGFS_ATTR(ext_prop_, type); 1365CONFIGFS_ATTR(ext_prop_, data); 1366 1367static struct configfs_attribute *ext_prop_attrs[] = { 1368 &ext_prop_attr_type, 1369 &ext_prop_attr_data, 1370 NULL, 1371}; 1372 1373static void usb_os_desc_ext_prop_release(struct config_item *item) 1374{ 1375 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1376 1377 kfree(ext_prop); /* frees a whole chunk */ 1378} 1379 1380static struct configfs_item_operations ext_prop_ops = { 1381 .release = usb_os_desc_ext_prop_release, 1382}; 1383 1384static struct config_item *ext_prop_make( 1385 struct config_group *group, 1386 const char *name) 1387{ 1388 struct usb_os_desc_ext_prop *ext_prop; 1389 struct config_item_type *ext_prop_type; 1390 struct usb_os_desc *desc; 1391 char *vlabuf; 1392 1393 vla_group(data_chunk); 1394 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1395 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1396 1397 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1398 if (!vlabuf) 1399 return ERR_PTR(-ENOMEM); 1400 1401 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1402 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1403 1404 desc = container_of(group, struct usb_os_desc, group); 1405 ext_prop_type->ct_item_ops = &ext_prop_ops; 1406 ext_prop_type->ct_attrs = ext_prop_attrs; 1407 ext_prop_type->ct_owner = desc->owner; 1408 1409 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1410 1411 ext_prop->name = kstrdup(name, GFP_KERNEL); 1412 if (!ext_prop->name) { 1413 kfree(vlabuf); 1414 return ERR_PTR(-ENOMEM); 1415 } 1416 desc->ext_prop_len += 14; 1417 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1418 if (desc->opts_mutex) 1419 mutex_lock(desc->opts_mutex); 1420 desc->ext_prop_len += ext_prop->name_len; 1421 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1422 ++desc->ext_prop_count; 1423 if (desc->opts_mutex) 1424 mutex_unlock(desc->opts_mutex); 1425 1426 return &ext_prop->item; 1427} 1428 1429static void ext_prop_drop(struct config_group *group, struct config_item *item) 1430{ 1431 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1432 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1433 1434 if (desc->opts_mutex) 1435 mutex_lock(desc->opts_mutex); 1436 list_del(&ext_prop->entry); 1437 --desc->ext_prop_count; 1438 kfree(ext_prop->name); 1439 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1440 if (desc->opts_mutex) 1441 mutex_unlock(desc->opts_mutex); 1442 config_item_put(item); 1443} 1444 1445static struct configfs_group_operations interf_grp_ops = { 1446 .make_item = &ext_prop_make, 1447 .drop_item = &ext_prop_drop, 1448}; 1449 1450static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1451 char *page) 1452{ 1453 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1454 return 8; 1455} 1456 1457static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1458 const char *page, size_t len) 1459{ 1460 struct usb_os_desc *desc = to_usb_os_desc(item); 1461 int l; 1462 1463 l = min_t(int, 8, len); 1464 if (page[l - 1] == '\n') 1465 --l; 1466 if (desc->opts_mutex) 1467 mutex_lock(desc->opts_mutex); 1468 memcpy(desc->ext_compat_id, page, l); 1469 1470 if (desc->opts_mutex) 1471 mutex_unlock(desc->opts_mutex); 1472 1473 return len; 1474} 1475 1476static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1477 char *page) 1478{ 1479 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1480 return 8; 1481} 1482 1483static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1484 const char *page, size_t len) 1485{ 1486 struct usb_os_desc *desc = to_usb_os_desc(item); 1487 int l; 1488 1489 l = min_t(int, 8, len); 1490 if (page[l - 1] == '\n') 1491 --l; 1492 if (desc->opts_mutex) 1493 mutex_lock(desc->opts_mutex); 1494 memcpy(desc->ext_compat_id + 8, page, l); 1495 1496 if (desc->opts_mutex) 1497 mutex_unlock(desc->opts_mutex); 1498 1499 return len; 1500} 1501 1502CONFIGFS_ATTR(interf_grp_, compatible_id); 1503CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1504 1505static struct configfs_attribute *interf_grp_attrs[] = { 1506 &interf_grp_attr_compatible_id, 1507 &interf_grp_attr_sub_compatible_id, 1508 NULL 1509}; 1510 1511struct config_group *usb_os_desc_prepare_interf_dir( 1512 struct config_group *parent, 1513 int n_interf, 1514 struct usb_os_desc **desc, 1515 char **names, 1516 struct module *owner) 1517{ 1518 struct config_group *os_desc_group; 1519 struct config_item_type *os_desc_type, *interface_type; 1520 1521 vla_group(data_chunk); 1522 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1523 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1524 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1525 1526 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1527 if (!vlabuf) 1528 return ERR_PTR(-ENOMEM); 1529 1530 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1531 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1532 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1533 1534 os_desc_type->ct_owner = owner; 1535 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1536 configfs_add_default_group(os_desc_group, parent); 1537 1538 interface_type->ct_group_ops = &interf_grp_ops; 1539 interface_type->ct_attrs = interf_grp_attrs; 1540 interface_type->ct_owner = owner; 1541 1542 while (n_interf--) { 1543 struct usb_os_desc *d; 1544 1545 d = desc[n_interf]; 1546 d->owner = owner; 1547 config_group_init_type_name(&d->group, "", interface_type); 1548 config_item_set_name(&d->group.cg_item, "interface.%s", 1549 names[n_interf]); 1550 configfs_add_default_group(&d->group, os_desc_group); 1551 } 1552 1553 return os_desc_group; 1554} 1555EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1556 1557static int configfs_do_nothing(struct usb_composite_dev *cdev) 1558{ 1559 WARN_ON(1); 1560 return -EINVAL; 1561} 1562 1563int composite_dev_prepare(struct usb_composite_driver *composite, 1564 struct usb_composite_dev *dev); 1565 1566int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1567 struct usb_ep *ep0); 1568 1569static void purge_configs_funcs(struct gadget_info *gi) 1570{ 1571 struct usb_configuration *c; 1572 1573 list_for_each_entry(c, &gi->cdev.configs, list) { 1574 struct usb_function *f, *tmp; 1575 struct config_usb_cfg *cfg; 1576 1577 cfg = container_of(c, struct config_usb_cfg, c); 1578 1579 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1580 1581 list_move(&f->list, &cfg->func_list); 1582 if (f->unbind) { 1583 dev_dbg(&gi->cdev.gadget->dev, 1584 "unbind function '%s'/%p\n", 1585 f->name, f); 1586 f->unbind(c, f); 1587 } 1588 } 1589 c->next_interface_id = 0; 1590 memset(c->interface, 0, sizeof(c->interface)); 1591 c->superspeed_plus = 0; 1592 c->superspeed = 0; 1593 c->highspeed = 0; 1594 c->fullspeed = 0; 1595 } 1596} 1597 1598static struct usb_string * 1599configfs_attach_gadget_strings(struct gadget_info *gi) 1600{ 1601 struct usb_gadget_strings **gadget_strings; 1602 struct gadget_language *language; 1603 struct gadget_string *string; 1604 unsigned int nlangs = 0; 1605 struct list_head *iter; 1606 struct usb_string *us; 1607 unsigned int i = 0; 1608 int nstrings = -1; 1609 unsigned int j; 1610 1611 list_for_each(iter, &gi->string_list) 1612 nlangs++; 1613 1614 /* Bail out early if no languages are configured */ 1615 if (!nlangs) 1616 return NULL; 1617 1618 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */ 1619 sizeof(struct usb_gadget_strings *), GFP_KERNEL); 1620 if (!gadget_strings) 1621 return ERR_PTR(-ENOMEM); 1622 1623 list_for_each_entry(language, &gi->string_list, list) { 1624 struct usb_string *stringtab; 1625 1626 if (nstrings == -1) { 1627 nstrings = language->nstrings; 1628 } else if (nstrings != language->nstrings) { 1629 pr_err("languages must contain the same number of strings\n"); 1630 us = ERR_PTR(-EINVAL); 1631 goto cleanup; 1632 } 1633 1634 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string), 1635 GFP_KERNEL); 1636 if (!stringtab) { 1637 us = ERR_PTR(-ENOMEM); 1638 goto cleanup; 1639 } 1640 1641 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX; 1642 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer; 1643 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX; 1644 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product; 1645 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX; 1646 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber; 1647 1648 j = USB_GADGET_FIRST_AVAIL_IDX; 1649 list_for_each_entry(string, &language->gadget_strings, list) { 1650 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string)); 1651 j++; 1652 } 1653 1654 language->stringtab_dev.strings = stringtab; 1655 gadget_strings[i] = &language->stringtab_dev; 1656 i++; 1657 } 1658 1659 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings); 1660 1661cleanup: 1662 list_for_each_entry(language, &gi->string_list, list) { 1663 kfree(language->stringtab_dev.strings); 1664 language->stringtab_dev.strings = NULL; 1665 } 1666 1667 kfree(gadget_strings); 1668 1669 return us; 1670} 1671 1672static int configfs_composite_bind(struct usb_gadget *gadget, 1673 struct usb_gadget_driver *gdriver) 1674{ 1675 struct usb_composite_driver *composite = to_cdriver(gdriver); 1676 struct gadget_info *gi = container_of(composite, 1677 struct gadget_info, composite); 1678 struct usb_composite_dev *cdev = &gi->cdev; 1679 struct usb_configuration *c; 1680 struct usb_string *s; 1681 unsigned i; 1682 int ret; 1683 1684 /* the gi->lock is hold by the caller */ 1685 gi->unbind = 0; 1686 cdev->gadget = gadget; 1687 set_gadget_data(gadget, cdev); 1688 ret = composite_dev_prepare(composite, cdev); 1689 if (ret) 1690 return ret; 1691 /* and now the gadget bind */ 1692 ret = -EINVAL; 1693 1694 if (list_empty(&gi->cdev.configs)) { 1695 pr_err("Need at least one configuration in %s.\n", 1696 gi->composite.name); 1697 goto err_comp_cleanup; 1698 } 1699 1700 1701 list_for_each_entry(c, &gi->cdev.configs, list) { 1702 struct config_usb_cfg *cfg; 1703 1704 cfg = container_of(c, struct config_usb_cfg, c); 1705 if (list_empty(&cfg->func_list)) { 1706 pr_err("Config %s/%d of %s needs at least one function.\n", 1707 c->label, c->bConfigurationValue, 1708 gi->composite.name); 1709 goto err_comp_cleanup; 1710 } 1711 } 1712 1713 /* init all strings */ 1714 if (!list_empty(&gi->string_list)) { 1715 s = configfs_attach_gadget_strings(gi); 1716 if (IS_ERR(s)) { 1717 ret = PTR_ERR(s); 1718 goto err_comp_cleanup; 1719 } 1720 1721 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1722 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1723 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1724 1725 gi->cdev.usb_strings = s; 1726 } 1727 1728 if (gi->use_webusb) { 1729 cdev->use_webusb = true; 1730 cdev->bcd_webusb_version = gi->bcd_webusb_version; 1731 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code; 1732 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH); 1733 } 1734 1735 if (gi->use_os_desc) { 1736 cdev->use_os_string = true; 1737 cdev->b_vendor_code = gi->b_vendor_code; 1738 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1739 } 1740 1741 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1742 struct usb_descriptor_header *usb_desc; 1743 1744 usb_desc = usb_otg_descriptor_alloc(gadget); 1745 if (!usb_desc) { 1746 ret = -ENOMEM; 1747 goto err_comp_cleanup; 1748 } 1749 usb_otg_descriptor_init(gadget, usb_desc); 1750 otg_desc[0] = usb_desc; 1751 otg_desc[1] = NULL; 1752 } 1753 1754 /* Go through all configs, attach all functions */ 1755 list_for_each_entry(c, &gi->cdev.configs, list) { 1756 struct config_usb_cfg *cfg; 1757 struct usb_function *f; 1758 struct usb_function *tmp; 1759 struct gadget_config_name *cn; 1760 1761 if (gadget_is_otg(gadget)) 1762 c->descriptors = otg_desc; 1763 1764 /* Properly configure the bmAttributes wakeup bit */ 1765 check_remote_wakeup_config(gadget, c); 1766 1767 cfg = container_of(c, struct config_usb_cfg, c); 1768 if (!list_empty(&cfg->string_list)) { 1769 i = 0; 1770 list_for_each_entry(cn, &cfg->string_list, list) { 1771 cfg->gstrings[i] = &cn->stringtab_dev; 1772 cn->stringtab_dev.strings = &cn->strings; 1773 cn->strings.s = cn->configuration; 1774 i++; 1775 } 1776 cfg->gstrings[i] = NULL; 1777 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1778 if (IS_ERR(s)) { 1779 ret = PTR_ERR(s); 1780 goto err_comp_cleanup; 1781 } 1782 c->iConfiguration = s[0].id; 1783 } 1784 1785 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1786 list_del(&f->list); 1787 ret = usb_add_function(c, f); 1788 if (ret) { 1789 list_add(&f->list, &cfg->func_list); 1790 goto err_purge_funcs; 1791 } 1792 } 1793 ret = usb_gadget_check_config(cdev->gadget); 1794 if (ret) 1795 goto err_purge_funcs; 1796 1797 usb_ep_autoconfig_reset(cdev->gadget); 1798 } 1799 if (cdev->use_os_string) { 1800 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1801 if (ret) 1802 goto err_purge_funcs; 1803 } 1804 1805 usb_ep_autoconfig_reset(cdev->gadget); 1806 return 0; 1807 1808err_purge_funcs: 1809 purge_configs_funcs(gi); 1810err_comp_cleanup: 1811 composite_dev_cleanup(cdev); 1812 return ret; 1813} 1814 1815static void configfs_composite_unbind(struct usb_gadget *gadget) 1816{ 1817 struct usb_composite_dev *cdev; 1818 struct gadget_info *gi; 1819 unsigned long flags; 1820 1821 /* the gi->lock is hold by the caller */ 1822 1823 cdev = get_gadget_data(gadget); 1824 gi = container_of(cdev, struct gadget_info, cdev); 1825 spin_lock_irqsave(&gi->spinlock, flags); 1826 gi->unbind = 1; 1827 spin_unlock_irqrestore(&gi->spinlock, flags); 1828 1829 kfree(otg_desc[0]); 1830 otg_desc[0] = NULL; 1831 purge_configs_funcs(gi); 1832 composite_dev_cleanup(cdev); 1833 usb_ep_autoconfig_reset(cdev->gadget); 1834 spin_lock_irqsave(&gi->spinlock, flags); 1835 cdev->gadget = NULL; 1836 cdev->deactivations = 0; 1837 gadget->deactivated = false; 1838 set_gadget_data(gadget, NULL); 1839 spin_unlock_irqrestore(&gi->spinlock, flags); 1840} 1841 1842static int configfs_composite_setup(struct usb_gadget *gadget, 1843 const struct usb_ctrlrequest *ctrl) 1844{ 1845 struct usb_composite_dev *cdev; 1846 struct gadget_info *gi; 1847 unsigned long flags; 1848 int ret; 1849 1850 cdev = get_gadget_data(gadget); 1851 if (!cdev) 1852 return 0; 1853 1854 gi = container_of(cdev, struct gadget_info, cdev); 1855 spin_lock_irqsave(&gi->spinlock, flags); 1856 cdev = get_gadget_data(gadget); 1857 if (!cdev || gi->unbind) { 1858 spin_unlock_irqrestore(&gi->spinlock, flags); 1859 return 0; 1860 } 1861 1862 ret = composite_setup(gadget, ctrl); 1863 spin_unlock_irqrestore(&gi->spinlock, flags); 1864 return ret; 1865} 1866 1867static void configfs_composite_disconnect(struct usb_gadget *gadget) 1868{ 1869 struct usb_composite_dev *cdev; 1870 struct gadget_info *gi; 1871 unsigned long flags; 1872 1873 cdev = get_gadget_data(gadget); 1874 if (!cdev) 1875 return; 1876 1877 gi = container_of(cdev, struct gadget_info, cdev); 1878 spin_lock_irqsave(&gi->spinlock, flags); 1879 cdev = get_gadget_data(gadget); 1880 if (!cdev || gi->unbind) { 1881 spin_unlock_irqrestore(&gi->spinlock, flags); 1882 return; 1883 } 1884 1885 composite_disconnect(gadget); 1886 spin_unlock_irqrestore(&gi->spinlock, flags); 1887} 1888 1889static void configfs_composite_reset(struct usb_gadget *gadget) 1890{ 1891 struct usb_composite_dev *cdev; 1892 struct gadget_info *gi; 1893 unsigned long flags; 1894 1895 cdev = get_gadget_data(gadget); 1896 if (!cdev) 1897 return; 1898 1899 gi = container_of(cdev, struct gadget_info, cdev); 1900 spin_lock_irqsave(&gi->spinlock, flags); 1901 cdev = get_gadget_data(gadget); 1902 if (!cdev || gi->unbind) { 1903 spin_unlock_irqrestore(&gi->spinlock, flags); 1904 return; 1905 } 1906 1907 composite_reset(gadget); 1908 spin_unlock_irqrestore(&gi->spinlock, flags); 1909} 1910 1911static void configfs_composite_suspend(struct usb_gadget *gadget) 1912{ 1913 struct usb_composite_dev *cdev; 1914 struct gadget_info *gi; 1915 unsigned long flags; 1916 1917 cdev = get_gadget_data(gadget); 1918 if (!cdev) 1919 return; 1920 1921 gi = container_of(cdev, struct gadget_info, cdev); 1922 spin_lock_irqsave(&gi->spinlock, flags); 1923 cdev = get_gadget_data(gadget); 1924 if (!cdev || gi->unbind) { 1925 spin_unlock_irqrestore(&gi->spinlock, flags); 1926 return; 1927 } 1928 1929 composite_suspend(gadget); 1930 spin_unlock_irqrestore(&gi->spinlock, flags); 1931} 1932 1933static void configfs_composite_resume(struct usb_gadget *gadget) 1934{ 1935 struct usb_composite_dev *cdev; 1936 struct gadget_info *gi; 1937 unsigned long flags; 1938 1939 cdev = get_gadget_data(gadget); 1940 if (!cdev) 1941 return; 1942 1943 gi = container_of(cdev, struct gadget_info, cdev); 1944 spin_lock_irqsave(&gi->spinlock, flags); 1945 cdev = get_gadget_data(gadget); 1946 if (!cdev || gi->unbind) { 1947 spin_unlock_irqrestore(&gi->spinlock, flags); 1948 return; 1949 } 1950 1951 composite_resume(gadget); 1952 spin_unlock_irqrestore(&gi->spinlock, flags); 1953} 1954 1955static const struct usb_gadget_driver configfs_driver_template = { 1956 .bind = configfs_composite_bind, 1957 .unbind = configfs_composite_unbind, 1958 1959 .setup = configfs_composite_setup, 1960 .reset = configfs_composite_reset, 1961 .disconnect = configfs_composite_disconnect, 1962 1963 .suspend = configfs_composite_suspend, 1964 .resume = configfs_composite_resume, 1965 1966 .max_speed = USB_SPEED_SUPER_PLUS, 1967 .driver = { 1968 .owner = THIS_MODULE, 1969 }, 1970 .match_existing_only = 1, 1971}; 1972 1973static struct config_group *gadgets_make( 1974 struct config_group *group, 1975 const char *name) 1976{ 1977 struct gadget_info *gi; 1978 1979 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1980 if (!gi) 1981 return ERR_PTR(-ENOMEM); 1982 1983 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1984 1985 config_group_init_type_name(&gi->functions_group, "functions", 1986 &functions_type); 1987 configfs_add_default_group(&gi->functions_group, &gi->group); 1988 1989 config_group_init_type_name(&gi->configs_group, "configs", 1990 &config_desc_type); 1991 configfs_add_default_group(&gi->configs_group, &gi->group); 1992 1993 config_group_init_type_name(&gi->strings_group, "strings", 1994 &gadget_language_strings_type); 1995 configfs_add_default_group(&gi->strings_group, &gi->group); 1996 1997 config_group_init_type_name(&gi->os_desc_group, "os_desc", 1998 &os_desc_type); 1999 configfs_add_default_group(&gi->os_desc_group, &gi->group); 2000 2001 config_group_init_type_name(&gi->webusb_group, "webusb", 2002 &webusb_type); 2003 configfs_add_default_group(&gi->webusb_group, &gi->group); 2004 2005 gi->composite.bind = configfs_do_nothing; 2006 gi->composite.unbind = configfs_do_nothing; 2007 gi->composite.suspend = NULL; 2008 gi->composite.resume = NULL; 2009 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 2010 2011 spin_lock_init(&gi->spinlock); 2012 mutex_init(&gi->lock); 2013 INIT_LIST_HEAD(&gi->string_list); 2014 INIT_LIST_HEAD(&gi->available_func); 2015 2016 composite_init_dev(&gi->cdev); 2017 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 2018 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 2019 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 2020 2021 gi->composite.gadget_driver = configfs_driver_template; 2022 2023 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL, 2024 "configfs-gadget.%s", name); 2025 if (!gi->composite.gadget_driver.driver.name) 2026 goto err; 2027 2028 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 2029 gi->composite.name = gi->composite.gadget_driver.function; 2030 2031 if (!gi->composite.gadget_driver.function) 2032 goto out_free_driver_name; 2033 2034 return &gi->group; 2035 2036out_free_driver_name: 2037 kfree(gi->composite.gadget_driver.driver.name); 2038err: 2039 kfree(gi); 2040 return ERR_PTR(-ENOMEM); 2041} 2042 2043static void gadgets_drop(struct config_group *group, struct config_item *item) 2044{ 2045 config_item_put(item); 2046} 2047 2048static struct configfs_group_operations gadgets_ops = { 2049 .make_group = &gadgets_make, 2050 .drop_item = &gadgets_drop, 2051}; 2052 2053static const struct config_item_type gadgets_type = { 2054 .ct_group_ops = &gadgets_ops, 2055 .ct_owner = THIS_MODULE, 2056}; 2057 2058static struct configfs_subsystem gadget_subsys = { 2059 .su_group = { 2060 .cg_item = { 2061 .ci_namebuf = "usb_gadget", 2062 .ci_type = &gadgets_type, 2063 }, 2064 }, 2065 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 2066}; 2067 2068void unregister_gadget_item(struct config_item *item) 2069{ 2070 struct gadget_info *gi = to_gadget_info(item); 2071 2072 mutex_lock(&gi->lock); 2073 unregister_gadget(gi); 2074 mutex_unlock(&gi->lock); 2075} 2076EXPORT_SYMBOL_GPL(unregister_gadget_item); 2077 2078static int __init gadget_cfs_init(void) 2079{ 2080 int ret; 2081 2082 config_group_init(&gadget_subsys.su_group); 2083 2084 ret = configfs_register_subsystem(&gadget_subsys); 2085 return ret; 2086} 2087module_init(gadget_cfs_init); 2088 2089static void __exit gadget_cfs_exit(void) 2090{ 2091 configfs_unregister_subsystem(&gadget_subsys); 2092} 2093module_exit(gadget_cfs_exit); 2094