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/nls.h> 7 #include <linux/usb/composite.h> 8 #include <linux/usb/gadget_configfs.h> 9 #include "configfs.h" 10 #include "u_f.h" 11 #include "u_os_desc.h" 12 13 int check_user_usb_string(const char *name, 14 struct usb_gadget_strings *stringtab_dev) 15 { 16 u16 num; 17 int ret; 18 19 ret = kstrtou16(name, 0, &num); 20 if (ret) 21 return ret; 22 23 if (!usb_validate_langid(num)) 24 return -EINVAL; 25 26 stringtab_dev->language = num; 27 return 0; 28 } 29 30 #define MAX_NAME_LEN 40 31 #define MAX_USB_STRING_LANGS 2 32 33 static const struct usb_descriptor_header *otg_desc[2]; 34 35 struct gadget_info { 36 struct config_group group; 37 struct config_group functions_group; 38 struct config_group configs_group; 39 struct config_group strings_group; 40 struct config_group os_desc_group; 41 42 struct mutex lock; 43 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1]; 44 struct list_head string_list; 45 struct list_head available_func; 46 47 struct usb_composite_driver composite; 48 struct usb_composite_dev cdev; 49 bool use_os_desc; 50 char b_vendor_code; 51 char qw_sign[OS_STRING_QW_SIGN_LEN]; 52 spinlock_t spinlock; 53 bool unbind; 54 }; 55 56 static inline struct gadget_info *to_gadget_info(struct config_item *item) 57 { 58 return container_of(to_config_group(item), struct gadget_info, group); 59 } 60 61 struct config_usb_cfg { 62 struct config_group group; 63 struct config_group strings_group; 64 struct list_head string_list; 65 struct usb_configuration c; 66 struct list_head func_list; 67 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1]; 68 }; 69 70 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item) 71 { 72 return container_of(to_config_group(item), struct config_usb_cfg, 73 group); 74 } 75 76 static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg) 77 { 78 return container_of(cfg->c.cdev, struct gadget_info, cdev); 79 } 80 81 struct gadget_strings { 82 struct usb_gadget_strings stringtab_dev; 83 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX]; 84 char *manufacturer; 85 char *product; 86 char *serialnumber; 87 88 struct config_group group; 89 struct list_head list; 90 }; 91 92 struct gadget_config_name { 93 struct usb_gadget_strings stringtab_dev; 94 struct usb_string strings; 95 char *configuration; 96 97 struct config_group group; 98 struct list_head list; 99 }; 100 101 #define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1) 102 103 static int usb_string_copy(const char *s, char **s_copy) 104 { 105 int ret; 106 char *str; 107 char *copy = *s_copy; 108 ret = strlen(s); 109 if (ret > USB_MAX_STRING_LEN) 110 return -EOVERFLOW; 111 112 if (copy) { 113 str = copy; 114 } else { 115 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL); 116 if (!str) 117 return -ENOMEM; 118 } 119 strcpy(str, s); 120 if (str[ret - 1] == '\n') 121 str[ret - 1] = '\0'; 122 *s_copy = str; 123 return 0; 124 } 125 126 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \ 127 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \ 128 char *page) \ 129 { \ 130 return sprintf(page, "0x%02x\n", \ 131 to_gadget_info(item)->cdev.desc.__name); \ 132 } 133 134 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \ 135 static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \ 136 char *page) \ 137 { \ 138 return sprintf(page, "0x%04x\n", \ 139 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \ 140 } 141 142 143 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \ 144 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \ 145 const char *page, size_t len) \ 146 { \ 147 u8 val; \ 148 int ret; \ 149 ret = kstrtou8(page, 0, &val); \ 150 if (ret) \ 151 return ret; \ 152 to_gadget_info(item)->cdev.desc._name = val; \ 153 return len; \ 154 } 155 156 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \ 157 static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \ 158 const char *page, size_t len) \ 159 { \ 160 u16 val; \ 161 int ret; \ 162 ret = kstrtou16(page, 0, &val); \ 163 if (ret) \ 164 return ret; \ 165 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \ 166 return len; \ 167 } 168 169 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \ 170 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \ 171 GI_DEVICE_DESC_SIMPLE_W_##_type(_name) 172 173 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB); 174 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8); 175 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8); 176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8); 177 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8); 178 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16); 179 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16); 180 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice); 181 182 static ssize_t is_valid_bcd(u16 bcd_val) 183 { 184 if ((bcd_val & 0xf) > 9) 185 return -EINVAL; 186 if (((bcd_val >> 4) & 0xf) > 9) 187 return -EINVAL; 188 if (((bcd_val >> 8) & 0xf) > 9) 189 return -EINVAL; 190 if (((bcd_val >> 12) & 0xf) > 9) 191 return -EINVAL; 192 return 0; 193 } 194 195 static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item, 196 const char *page, size_t len) 197 { 198 u16 bcdDevice; 199 int ret; 200 201 ret = kstrtou16(page, 0, &bcdDevice); 202 if (ret) 203 return ret; 204 ret = is_valid_bcd(bcdDevice); 205 if (ret) 206 return ret; 207 208 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice); 209 return len; 210 } 211 212 static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item, 213 const char *page, size_t len) 214 { 215 u16 bcdUSB; 216 int ret; 217 218 ret = kstrtou16(page, 0, &bcdUSB); 219 if (ret) 220 return ret; 221 ret = is_valid_bcd(bcdUSB); 222 if (ret) 223 return ret; 224 225 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB); 226 return len; 227 } 228 229 static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page) 230 { 231 struct gadget_info *gi = to_gadget_info(item); 232 char *udc_name; 233 int ret; 234 235 mutex_lock(&gi->lock); 236 udc_name = gi->composite.gadget_driver.udc_name; 237 ret = sprintf(page, "%s\n", udc_name ?: ""); 238 mutex_unlock(&gi->lock); 239 240 return ret; 241 } 242 243 static int unregister_gadget(struct gadget_info *gi) 244 { 245 int ret; 246 247 if (!gi->composite.gadget_driver.udc_name) 248 return -ENODEV; 249 250 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver); 251 if (ret) 252 return ret; 253 kfree(gi->composite.gadget_driver.udc_name); 254 gi->composite.gadget_driver.udc_name = NULL; 255 return 0; 256 } 257 258 static ssize_t gadget_dev_desc_UDC_store(struct config_item *item, 259 const char *page, size_t len) 260 { 261 struct gadget_info *gi = to_gadget_info(item); 262 char *name; 263 int ret; 264 265 if (strlen(page) < len) 266 return -EOVERFLOW; 267 268 name = kstrdup(page, GFP_KERNEL); 269 if (!name) 270 return -ENOMEM; 271 if (name[len - 1] == '\n') 272 name[len - 1] = '\0'; 273 274 mutex_lock(&gi->lock); 275 276 if (!strlen(name)) { 277 ret = unregister_gadget(gi); 278 if (ret) 279 goto err; 280 kfree(name); 281 } else { 282 if (gi->composite.gadget_driver.udc_name) { 283 ret = -EBUSY; 284 goto err; 285 } 286 gi->composite.gadget_driver.udc_name = name; 287 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver); 288 if (ret) { 289 gi->composite.gadget_driver.udc_name = NULL; 290 goto err; 291 } 292 } 293 mutex_unlock(&gi->lock); 294 return len; 295 err: 296 kfree(name); 297 mutex_unlock(&gi->lock); 298 return ret; 299 } 300 301 static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item, 302 char *page) 303 { 304 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed; 305 306 return sprintf(page, "%s\n", usb_speed_string(speed)); 307 } 308 309 static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item, 310 const char *page, size_t len) 311 { 312 struct gadget_info *gi = to_gadget_info(item); 313 314 mutex_lock(&gi->lock); 315 316 /* Prevent changing of max_speed after the driver is binded */ 317 if (gi->composite.gadget_driver.udc_name) 318 goto err; 319 320 if (strncmp(page, "super-speed-plus", 16) == 0) 321 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 322 else if (strncmp(page, "super-speed", 11) == 0) 323 gi->composite.max_speed = USB_SPEED_SUPER; 324 else if (strncmp(page, "high-speed", 10) == 0) 325 gi->composite.max_speed = USB_SPEED_HIGH; 326 else if (strncmp(page, "full-speed", 10) == 0) 327 gi->composite.max_speed = USB_SPEED_FULL; 328 else if (strncmp(page, "low-speed", 9) == 0) 329 gi->composite.max_speed = USB_SPEED_LOW; 330 else 331 goto err; 332 333 gi->composite.gadget_driver.max_speed = gi->composite.max_speed; 334 335 mutex_unlock(&gi->lock); 336 return len; 337 err: 338 mutex_unlock(&gi->lock); 339 return -EINVAL; 340 } 341 342 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass); 343 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass); 344 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol); 345 CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0); 346 CONFIGFS_ATTR(gadget_dev_desc_, idVendor); 347 CONFIGFS_ATTR(gadget_dev_desc_, idProduct); 348 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice); 349 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB); 350 CONFIGFS_ATTR(gadget_dev_desc_, UDC); 351 CONFIGFS_ATTR(gadget_dev_desc_, max_speed); 352 353 static struct configfs_attribute *gadget_root_attrs[] = { 354 &gadget_dev_desc_attr_bDeviceClass, 355 &gadget_dev_desc_attr_bDeviceSubClass, 356 &gadget_dev_desc_attr_bDeviceProtocol, 357 &gadget_dev_desc_attr_bMaxPacketSize0, 358 &gadget_dev_desc_attr_idVendor, 359 &gadget_dev_desc_attr_idProduct, 360 &gadget_dev_desc_attr_bcdDevice, 361 &gadget_dev_desc_attr_bcdUSB, 362 &gadget_dev_desc_attr_UDC, 363 &gadget_dev_desc_attr_max_speed, 364 NULL, 365 }; 366 367 static inline struct gadget_strings *to_gadget_strings(struct config_item *item) 368 { 369 return container_of(to_config_group(item), struct gadget_strings, 370 group); 371 } 372 373 static inline struct gadget_config_name *to_gadget_config_name( 374 struct config_item *item) 375 { 376 return container_of(to_config_group(item), struct gadget_config_name, 377 group); 378 } 379 380 static inline struct usb_function_instance *to_usb_function_instance( 381 struct config_item *item) 382 { 383 return container_of(to_config_group(item), 384 struct usb_function_instance, group); 385 } 386 387 static void gadget_info_attr_release(struct config_item *item) 388 { 389 struct gadget_info *gi = to_gadget_info(item); 390 391 WARN_ON(!list_empty(&gi->cdev.configs)); 392 WARN_ON(!list_empty(&gi->string_list)); 393 WARN_ON(!list_empty(&gi->available_func)); 394 kfree(gi->composite.gadget_driver.function); 395 kfree(gi); 396 } 397 398 static struct configfs_item_operations gadget_root_item_ops = { 399 .release = gadget_info_attr_release, 400 }; 401 402 static void gadget_config_attr_release(struct config_item *item) 403 { 404 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 405 406 WARN_ON(!list_empty(&cfg->c.functions)); 407 list_del(&cfg->c.list); 408 kfree(cfg->c.label); 409 kfree(cfg); 410 } 411 412 static int config_usb_cfg_link( 413 struct config_item *usb_cfg_ci, 414 struct config_item *usb_func_ci) 415 { 416 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 417 struct gadget_info *gi = cfg_to_gadget_info(cfg); 418 419 struct usb_function_instance *fi = 420 to_usb_function_instance(usb_func_ci); 421 struct usb_function_instance *a_fi; 422 struct usb_function *f; 423 int ret; 424 425 mutex_lock(&gi->lock); 426 /* 427 * Make sure this function is from within our _this_ gadget and not 428 * from another gadget or a random directory. 429 * Also a function instance can only be linked once. 430 */ 431 list_for_each_entry(a_fi, &gi->available_func, cfs_list) { 432 if (a_fi == fi) 433 break; 434 } 435 if (a_fi != fi) { 436 ret = -EINVAL; 437 goto out; 438 } 439 440 list_for_each_entry(f, &cfg->func_list, list) { 441 if (f->fi == fi) { 442 ret = -EEXIST; 443 goto out; 444 } 445 } 446 447 f = usb_get_function(fi); 448 if (IS_ERR(f)) { 449 ret = PTR_ERR(f); 450 goto out; 451 } 452 453 /* stash the function until we bind it to the gadget */ 454 list_add_tail(&f->list, &cfg->func_list); 455 ret = 0; 456 out: 457 mutex_unlock(&gi->lock); 458 return ret; 459 } 460 461 static void config_usb_cfg_unlink( 462 struct config_item *usb_cfg_ci, 463 struct config_item *usb_func_ci) 464 { 465 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 466 struct gadget_info *gi = cfg_to_gadget_info(cfg); 467 468 struct usb_function_instance *fi = 469 to_usb_function_instance(usb_func_ci); 470 struct usb_function *f; 471 472 /* 473 * ideally I would like to forbid to unlink functions while a gadget is 474 * bound to an UDC. Since this isn't possible at the moment, we simply 475 * force an unbind, the function is available here and then we can 476 * remove the function. 477 */ 478 mutex_lock(&gi->lock); 479 if (gi->composite.gadget_driver.udc_name) 480 unregister_gadget(gi); 481 WARN_ON(gi->composite.gadget_driver.udc_name); 482 483 list_for_each_entry(f, &cfg->func_list, list) { 484 if (f->fi == fi) { 485 list_del(&f->list); 486 usb_put_function(f); 487 mutex_unlock(&gi->lock); 488 return; 489 } 490 } 491 mutex_unlock(&gi->lock); 492 WARN(1, "Unable to locate function to unbind\n"); 493 } 494 495 static struct configfs_item_operations gadget_config_item_ops = { 496 .release = gadget_config_attr_release, 497 .allow_link = config_usb_cfg_link, 498 .drop_link = config_usb_cfg_unlink, 499 }; 500 501 502 static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item, 503 char *page) 504 { 505 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 506 507 return sprintf(page, "%u\n", cfg->c.MaxPower); 508 } 509 510 static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item, 511 const char *page, size_t len) 512 { 513 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 514 u16 val; 515 int ret; 516 ret = kstrtou16(page, 0, &val); 517 if (ret) 518 return ret; 519 if (DIV_ROUND_UP(val, 8) > 0xff) 520 return -ERANGE; 521 cfg->c.MaxPower = val; 522 return len; 523 } 524 525 static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item, 526 char *page) 527 { 528 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 529 530 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes); 531 } 532 533 static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item, 534 const char *page, size_t len) 535 { 536 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 537 u8 val; 538 int ret; 539 ret = kstrtou8(page, 0, &val); 540 if (ret) 541 return ret; 542 if (!(val & USB_CONFIG_ATT_ONE)) 543 return -EINVAL; 544 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER | 545 USB_CONFIG_ATT_WAKEUP)) 546 return -EINVAL; 547 cfg->c.bmAttributes = val; 548 return len; 549 } 550 551 CONFIGFS_ATTR(gadget_config_desc_, MaxPower); 552 CONFIGFS_ATTR(gadget_config_desc_, bmAttributes); 553 554 static struct configfs_attribute *gadget_config_attrs[] = { 555 &gadget_config_desc_attr_MaxPower, 556 &gadget_config_desc_attr_bmAttributes, 557 NULL, 558 }; 559 560 static const struct config_item_type gadget_config_type = { 561 .ct_item_ops = &gadget_config_item_ops, 562 .ct_attrs = gadget_config_attrs, 563 .ct_owner = THIS_MODULE, 564 }; 565 566 static const struct config_item_type gadget_root_type = { 567 .ct_item_ops = &gadget_root_item_ops, 568 .ct_attrs = gadget_root_attrs, 569 .ct_owner = THIS_MODULE, 570 }; 571 572 static void composite_init_dev(struct usb_composite_dev *cdev) 573 { 574 spin_lock_init(&cdev->lock); 575 INIT_LIST_HEAD(&cdev->configs); 576 INIT_LIST_HEAD(&cdev->gstrings); 577 } 578 579 static struct config_group *function_make( 580 struct config_group *group, 581 const char *name) 582 { 583 struct gadget_info *gi; 584 struct usb_function_instance *fi; 585 char buf[MAX_NAME_LEN]; 586 char *func_name; 587 char *instance_name; 588 int ret; 589 590 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 591 if (ret >= MAX_NAME_LEN) 592 return ERR_PTR(-ENAMETOOLONG); 593 594 func_name = buf; 595 instance_name = strchr(func_name, '.'); 596 if (!instance_name) { 597 pr_err("Unable to locate . in FUNC.INSTANCE\n"); 598 return ERR_PTR(-EINVAL); 599 } 600 *instance_name = '\0'; 601 instance_name++; 602 603 fi = usb_get_function_instance(func_name); 604 if (IS_ERR(fi)) 605 return ERR_CAST(fi); 606 607 ret = config_item_set_name(&fi->group.cg_item, "%s", name); 608 if (ret) { 609 usb_put_function_instance(fi); 610 return ERR_PTR(ret); 611 } 612 if (fi->set_inst_name) { 613 ret = fi->set_inst_name(fi, instance_name); 614 if (ret) { 615 usb_put_function_instance(fi); 616 return ERR_PTR(ret); 617 } 618 } 619 620 gi = container_of(group, struct gadget_info, functions_group); 621 622 mutex_lock(&gi->lock); 623 list_add_tail(&fi->cfs_list, &gi->available_func); 624 mutex_unlock(&gi->lock); 625 return &fi->group; 626 } 627 628 static void function_drop( 629 struct config_group *group, 630 struct config_item *item) 631 { 632 struct usb_function_instance *fi = to_usb_function_instance(item); 633 struct gadget_info *gi; 634 635 gi = container_of(group, struct gadget_info, functions_group); 636 637 mutex_lock(&gi->lock); 638 list_del(&fi->cfs_list); 639 mutex_unlock(&gi->lock); 640 config_item_put(item); 641 } 642 643 static struct configfs_group_operations functions_ops = { 644 .make_group = &function_make, 645 .drop_item = &function_drop, 646 }; 647 648 static const struct config_item_type functions_type = { 649 .ct_group_ops = &functions_ops, 650 .ct_owner = THIS_MODULE, 651 }; 652 653 GS_STRINGS_RW(gadget_config_name, configuration); 654 655 static struct configfs_attribute *gadget_config_name_langid_attrs[] = { 656 &gadget_config_name_attr_configuration, 657 NULL, 658 }; 659 660 static void gadget_config_name_attr_release(struct config_item *item) 661 { 662 struct gadget_config_name *cn = to_gadget_config_name(item); 663 664 kfree(cn->configuration); 665 666 list_del(&cn->list); 667 kfree(cn); 668 } 669 670 USB_CONFIG_STRING_RW_OPS(gadget_config_name); 671 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg); 672 673 static struct config_group *config_desc_make( 674 struct config_group *group, 675 const char *name) 676 { 677 struct gadget_info *gi; 678 struct config_usb_cfg *cfg; 679 char buf[MAX_NAME_LEN]; 680 char *num_str; 681 u8 num; 682 int ret; 683 684 gi = container_of(group, struct gadget_info, configs_group); 685 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 686 if (ret >= MAX_NAME_LEN) 687 return ERR_PTR(-ENAMETOOLONG); 688 689 num_str = strchr(buf, '.'); 690 if (!num_str) { 691 pr_err("Unable to locate . in name.bConfigurationValue\n"); 692 return ERR_PTR(-EINVAL); 693 } 694 695 *num_str = '\0'; 696 num_str++; 697 698 if (!strlen(buf)) 699 return ERR_PTR(-EINVAL); 700 701 ret = kstrtou8(num_str, 0, &num); 702 if (ret) 703 return ERR_PTR(ret); 704 705 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 706 if (!cfg) 707 return ERR_PTR(-ENOMEM); 708 cfg->c.label = kstrdup(buf, GFP_KERNEL); 709 if (!cfg->c.label) { 710 ret = -ENOMEM; 711 goto err; 712 } 713 cfg->c.bConfigurationValue = num; 714 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW; 715 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE; 716 INIT_LIST_HEAD(&cfg->string_list); 717 INIT_LIST_HEAD(&cfg->func_list); 718 719 config_group_init_type_name(&cfg->group, name, 720 &gadget_config_type); 721 722 config_group_init_type_name(&cfg->strings_group, "strings", 723 &gadget_config_name_strings_type); 724 configfs_add_default_group(&cfg->strings_group, &cfg->group); 725 726 ret = usb_add_config_only(&gi->cdev, &cfg->c); 727 if (ret) 728 goto err; 729 730 return &cfg->group; 731 err: 732 kfree(cfg->c.label); 733 kfree(cfg); 734 return ERR_PTR(ret); 735 } 736 737 static void config_desc_drop( 738 struct config_group *group, 739 struct config_item *item) 740 { 741 config_item_put(item); 742 } 743 744 static struct configfs_group_operations config_desc_ops = { 745 .make_group = &config_desc_make, 746 .drop_item = &config_desc_drop, 747 }; 748 749 static const struct config_item_type config_desc_type = { 750 .ct_group_ops = &config_desc_ops, 751 .ct_owner = THIS_MODULE, 752 }; 753 754 GS_STRINGS_RW(gadget_strings, manufacturer); 755 GS_STRINGS_RW(gadget_strings, product); 756 GS_STRINGS_RW(gadget_strings, serialnumber); 757 758 static struct configfs_attribute *gadget_strings_langid_attrs[] = { 759 &gadget_strings_attr_manufacturer, 760 &gadget_strings_attr_product, 761 &gadget_strings_attr_serialnumber, 762 NULL, 763 }; 764 765 static void gadget_strings_attr_release(struct config_item *item) 766 { 767 struct gadget_strings *gs = to_gadget_strings(item); 768 769 kfree(gs->manufacturer); 770 kfree(gs->product); 771 kfree(gs->serialnumber); 772 773 list_del(&gs->list); 774 kfree(gs); 775 } 776 777 USB_CONFIG_STRING_RW_OPS(gadget_strings); 778 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info); 779 780 static inline struct gadget_info *os_desc_item_to_gadget_info( 781 struct config_item *item) 782 { 783 return container_of(to_config_group(item), 784 struct gadget_info, os_desc_group); 785 } 786 787 static ssize_t os_desc_use_show(struct config_item *item, char *page) 788 { 789 return sprintf(page, "%d\n", 790 os_desc_item_to_gadget_info(item)->use_os_desc); 791 } 792 793 static ssize_t os_desc_use_store(struct config_item *item, const char *page, 794 size_t len) 795 { 796 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 797 int ret; 798 bool use; 799 800 mutex_lock(&gi->lock); 801 ret = strtobool(page, &use); 802 if (!ret) { 803 gi->use_os_desc = use; 804 ret = len; 805 } 806 mutex_unlock(&gi->lock); 807 808 return ret; 809 } 810 811 static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page) 812 { 813 return sprintf(page, "0x%02x\n", 814 os_desc_item_to_gadget_info(item)->b_vendor_code); 815 } 816 817 static ssize_t os_desc_b_vendor_code_store(struct config_item *item, 818 const char *page, size_t len) 819 { 820 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 821 int ret; 822 u8 b_vendor_code; 823 824 mutex_lock(&gi->lock); 825 ret = kstrtou8(page, 0, &b_vendor_code); 826 if (!ret) { 827 gi->b_vendor_code = b_vendor_code; 828 ret = len; 829 } 830 mutex_unlock(&gi->lock); 831 832 return ret; 833 } 834 835 static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page) 836 { 837 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 838 int res; 839 840 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN, 841 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1); 842 page[res++] = '\n'; 843 844 return res; 845 } 846 847 static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page, 848 size_t len) 849 { 850 struct gadget_info *gi = os_desc_item_to_gadget_info(item); 851 int res, l; 852 853 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); 854 if (page[l - 1] == '\n') 855 --l; 856 857 mutex_lock(&gi->lock); 858 res = utf8s_to_utf16s(page, l, 859 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 860 OS_STRING_QW_SIGN_LEN); 861 if (res > 0) 862 res = len; 863 mutex_unlock(&gi->lock); 864 865 return res; 866 } 867 868 CONFIGFS_ATTR(os_desc_, use); 869 CONFIGFS_ATTR(os_desc_, b_vendor_code); 870 CONFIGFS_ATTR(os_desc_, qw_sign); 871 872 static struct configfs_attribute *os_desc_attrs[] = { 873 &os_desc_attr_use, 874 &os_desc_attr_b_vendor_code, 875 &os_desc_attr_qw_sign, 876 NULL, 877 }; 878 879 static int os_desc_link(struct config_item *os_desc_ci, 880 struct config_item *usb_cfg_ci) 881 { 882 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 883 struct usb_composite_dev *cdev = &gi->cdev; 884 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci); 885 struct usb_configuration *c; 886 int ret; 887 888 mutex_lock(&gi->lock); 889 list_for_each_entry(c, &cdev->configs, list) { 890 if (c == &c_target->c) 891 break; 892 } 893 if (c != &c_target->c) { 894 ret = -EINVAL; 895 goto out; 896 } 897 898 if (cdev->os_desc_config) { 899 ret = -EBUSY; 900 goto out; 901 } 902 903 cdev->os_desc_config = &c_target->c; 904 ret = 0; 905 906 out: 907 mutex_unlock(&gi->lock); 908 return ret; 909 } 910 911 static void os_desc_unlink(struct config_item *os_desc_ci, 912 struct config_item *usb_cfg_ci) 913 { 914 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci); 915 struct usb_composite_dev *cdev = &gi->cdev; 916 917 mutex_lock(&gi->lock); 918 if (gi->composite.gadget_driver.udc_name) 919 unregister_gadget(gi); 920 cdev->os_desc_config = NULL; 921 WARN_ON(gi->composite.gadget_driver.udc_name); 922 mutex_unlock(&gi->lock); 923 } 924 925 static struct configfs_item_operations os_desc_ops = { 926 .allow_link = os_desc_link, 927 .drop_link = os_desc_unlink, 928 }; 929 930 static struct config_item_type os_desc_type = { 931 .ct_item_ops = &os_desc_ops, 932 .ct_attrs = os_desc_attrs, 933 .ct_owner = THIS_MODULE, 934 }; 935 936 static inline struct usb_os_desc_ext_prop 937 *to_usb_os_desc_ext_prop(struct config_item *item) 938 { 939 return container_of(item, struct usb_os_desc_ext_prop, item); 940 } 941 942 static ssize_t ext_prop_type_show(struct config_item *item, char *page) 943 { 944 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type); 945 } 946 947 static ssize_t ext_prop_type_store(struct config_item *item, 948 const char *page, size_t len) 949 { 950 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 951 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 952 u8 type; 953 int ret; 954 955 if (desc->opts_mutex) 956 mutex_lock(desc->opts_mutex); 957 ret = kstrtou8(page, 0, &type); 958 if (ret) 959 goto end; 960 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) { 961 ret = -EINVAL; 962 goto end; 963 } 964 965 if ((ext_prop->type == USB_EXT_PROP_BINARY || 966 ext_prop->type == USB_EXT_PROP_LE32 || 967 ext_prop->type == USB_EXT_PROP_BE32) && 968 (type == USB_EXT_PROP_UNICODE || 969 type == USB_EXT_PROP_UNICODE_ENV || 970 type == USB_EXT_PROP_UNICODE_LINK)) 971 ext_prop->data_len <<= 1; 972 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 973 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 974 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 975 (type == USB_EXT_PROP_BINARY || 976 type == USB_EXT_PROP_LE32 || 977 type == USB_EXT_PROP_BE32)) 978 ext_prop->data_len >>= 1; 979 ext_prop->type = type; 980 ret = len; 981 982 end: 983 if (desc->opts_mutex) 984 mutex_unlock(desc->opts_mutex); 985 return ret; 986 } 987 988 static ssize_t ext_prop_data_show(struct config_item *item, char *page) 989 { 990 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 991 int len = ext_prop->data_len; 992 993 if (ext_prop->type == USB_EXT_PROP_UNICODE || 994 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 995 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 996 len >>= 1; 997 memcpy(page, ext_prop->data, len); 998 999 return len; 1000 } 1001 1002 static ssize_t ext_prop_data_store(struct config_item *item, 1003 const char *page, size_t len) 1004 { 1005 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1006 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1007 char *new_data; 1008 size_t ret_len = len; 1009 1010 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1011 --len; 1012 new_data = kmemdup(page, len, GFP_KERNEL); 1013 if (!new_data) 1014 return -ENOMEM; 1015 1016 if (desc->opts_mutex) 1017 mutex_lock(desc->opts_mutex); 1018 kfree(ext_prop->data); 1019 ext_prop->data = new_data; 1020 desc->ext_prop_len -= ext_prop->data_len; 1021 ext_prop->data_len = len; 1022 desc->ext_prop_len += ext_prop->data_len; 1023 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1024 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1025 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1026 desc->ext_prop_len -= ext_prop->data_len; 1027 ext_prop->data_len <<= 1; 1028 ext_prop->data_len += 2; 1029 desc->ext_prop_len += ext_prop->data_len; 1030 } 1031 if (desc->opts_mutex) 1032 mutex_unlock(desc->opts_mutex); 1033 return ret_len; 1034 } 1035 1036 CONFIGFS_ATTR(ext_prop_, type); 1037 CONFIGFS_ATTR(ext_prop_, data); 1038 1039 static struct configfs_attribute *ext_prop_attrs[] = { 1040 &ext_prop_attr_type, 1041 &ext_prop_attr_data, 1042 NULL, 1043 }; 1044 1045 static void usb_os_desc_ext_prop_release(struct config_item *item) 1046 { 1047 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1048 1049 kfree(ext_prop); /* frees a whole chunk */ 1050 } 1051 1052 static struct configfs_item_operations ext_prop_ops = { 1053 .release = usb_os_desc_ext_prop_release, 1054 }; 1055 1056 static struct config_item *ext_prop_make( 1057 struct config_group *group, 1058 const char *name) 1059 { 1060 struct usb_os_desc_ext_prop *ext_prop; 1061 struct config_item_type *ext_prop_type; 1062 struct usb_os_desc *desc; 1063 char *vlabuf; 1064 1065 vla_group(data_chunk); 1066 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1067 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1068 1069 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1070 if (!vlabuf) 1071 return ERR_PTR(-ENOMEM); 1072 1073 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1074 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1075 1076 desc = container_of(group, struct usb_os_desc, group); 1077 ext_prop_type->ct_item_ops = &ext_prop_ops; 1078 ext_prop_type->ct_attrs = ext_prop_attrs; 1079 ext_prop_type->ct_owner = desc->owner; 1080 1081 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1082 1083 ext_prop->name = kstrdup(name, GFP_KERNEL); 1084 if (!ext_prop->name) { 1085 kfree(vlabuf); 1086 return ERR_PTR(-ENOMEM); 1087 } 1088 desc->ext_prop_len += 14; 1089 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1090 if (desc->opts_mutex) 1091 mutex_lock(desc->opts_mutex); 1092 desc->ext_prop_len += ext_prop->name_len; 1093 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1094 ++desc->ext_prop_count; 1095 if (desc->opts_mutex) 1096 mutex_unlock(desc->opts_mutex); 1097 1098 return &ext_prop->item; 1099 } 1100 1101 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1102 { 1103 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1104 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1105 1106 if (desc->opts_mutex) 1107 mutex_lock(desc->opts_mutex); 1108 list_del(&ext_prop->entry); 1109 --desc->ext_prop_count; 1110 kfree(ext_prop->name); 1111 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1112 if (desc->opts_mutex) 1113 mutex_unlock(desc->opts_mutex); 1114 config_item_put(item); 1115 } 1116 1117 static struct configfs_group_operations interf_grp_ops = { 1118 .make_item = &ext_prop_make, 1119 .drop_item = &ext_prop_drop, 1120 }; 1121 1122 static ssize_t interf_grp_compatible_id_show(struct config_item *item, 1123 char *page) 1124 { 1125 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8); 1126 return 8; 1127 } 1128 1129 static ssize_t interf_grp_compatible_id_store(struct config_item *item, 1130 const char *page, size_t len) 1131 { 1132 struct usb_os_desc *desc = to_usb_os_desc(item); 1133 int l; 1134 1135 l = min_t(int, 8, len); 1136 if (page[l - 1] == '\n') 1137 --l; 1138 if (desc->opts_mutex) 1139 mutex_lock(desc->opts_mutex); 1140 memcpy(desc->ext_compat_id, page, l); 1141 1142 if (desc->opts_mutex) 1143 mutex_unlock(desc->opts_mutex); 1144 1145 return len; 1146 } 1147 1148 static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item, 1149 char *page) 1150 { 1151 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8); 1152 return 8; 1153 } 1154 1155 static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item, 1156 const char *page, size_t len) 1157 { 1158 struct usb_os_desc *desc = to_usb_os_desc(item); 1159 int l; 1160 1161 l = min_t(int, 8, len); 1162 if (page[l - 1] == '\n') 1163 --l; 1164 if (desc->opts_mutex) 1165 mutex_lock(desc->opts_mutex); 1166 memcpy(desc->ext_compat_id + 8, page, l); 1167 1168 if (desc->opts_mutex) 1169 mutex_unlock(desc->opts_mutex); 1170 1171 return len; 1172 } 1173 1174 CONFIGFS_ATTR(interf_grp_, compatible_id); 1175 CONFIGFS_ATTR(interf_grp_, sub_compatible_id); 1176 1177 static struct configfs_attribute *interf_grp_attrs[] = { 1178 &interf_grp_attr_compatible_id, 1179 &interf_grp_attr_sub_compatible_id, 1180 NULL 1181 }; 1182 1183 struct config_group *usb_os_desc_prepare_interf_dir( 1184 struct config_group *parent, 1185 int n_interf, 1186 struct usb_os_desc **desc, 1187 char **names, 1188 struct module *owner) 1189 { 1190 struct config_group *os_desc_group; 1191 struct config_item_type *os_desc_type, *interface_type; 1192 1193 vla_group(data_chunk); 1194 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1195 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1196 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1197 1198 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1199 if (!vlabuf) 1200 return ERR_PTR(-ENOMEM); 1201 1202 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1203 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1204 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1205 1206 os_desc_type->ct_owner = owner; 1207 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1208 configfs_add_default_group(os_desc_group, parent); 1209 1210 interface_type->ct_group_ops = &interf_grp_ops; 1211 interface_type->ct_attrs = interf_grp_attrs; 1212 interface_type->ct_owner = owner; 1213 1214 while (n_interf--) { 1215 struct usb_os_desc *d; 1216 1217 d = desc[n_interf]; 1218 d->owner = owner; 1219 config_group_init_type_name(&d->group, "", interface_type); 1220 config_item_set_name(&d->group.cg_item, "interface.%s", 1221 names[n_interf]); 1222 configfs_add_default_group(&d->group, os_desc_group); 1223 } 1224 1225 return os_desc_group; 1226 } 1227 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1228 1229 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1230 { 1231 WARN_ON(1); 1232 return -EINVAL; 1233 } 1234 1235 int composite_dev_prepare(struct usb_composite_driver *composite, 1236 struct usb_composite_dev *dev); 1237 1238 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1239 struct usb_ep *ep0); 1240 1241 static void purge_configs_funcs(struct gadget_info *gi) 1242 { 1243 struct usb_configuration *c; 1244 1245 list_for_each_entry(c, &gi->cdev.configs, list) { 1246 struct usb_function *f, *tmp; 1247 struct config_usb_cfg *cfg; 1248 1249 cfg = container_of(c, struct config_usb_cfg, c); 1250 1251 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) { 1252 1253 list_move(&f->list, &cfg->func_list); 1254 if (f->unbind) { 1255 dev_dbg(&gi->cdev.gadget->dev, 1256 "unbind function '%s'/%p\n", 1257 f->name, f); 1258 f->unbind(c, f); 1259 } 1260 } 1261 c->next_interface_id = 0; 1262 memset(c->interface, 0, sizeof(c->interface)); 1263 c->superspeed_plus = 0; 1264 c->superspeed = 0; 1265 c->highspeed = 0; 1266 c->fullspeed = 0; 1267 } 1268 } 1269 1270 static int configfs_composite_bind(struct usb_gadget *gadget, 1271 struct usb_gadget_driver *gdriver) 1272 { 1273 struct usb_composite_driver *composite = to_cdriver(gdriver); 1274 struct gadget_info *gi = container_of(composite, 1275 struct gadget_info, composite); 1276 struct usb_composite_dev *cdev = &gi->cdev; 1277 struct usb_configuration *c; 1278 struct usb_string *s; 1279 unsigned i; 1280 int ret; 1281 1282 /* the gi->lock is hold by the caller */ 1283 gi->unbind = 0; 1284 cdev->gadget = gadget; 1285 set_gadget_data(gadget, cdev); 1286 ret = composite_dev_prepare(composite, cdev); 1287 if (ret) 1288 return ret; 1289 /* and now the gadget bind */ 1290 ret = -EINVAL; 1291 1292 if (list_empty(&gi->cdev.configs)) { 1293 pr_err("Need at least one configuration in %s.\n", 1294 gi->composite.name); 1295 goto err_comp_cleanup; 1296 } 1297 1298 1299 list_for_each_entry(c, &gi->cdev.configs, list) { 1300 struct config_usb_cfg *cfg; 1301 1302 cfg = container_of(c, struct config_usb_cfg, c); 1303 if (list_empty(&cfg->func_list)) { 1304 pr_err("Config %s/%d of %s needs at least one function.\n", 1305 c->label, c->bConfigurationValue, 1306 gi->composite.name); 1307 goto err_comp_cleanup; 1308 } 1309 } 1310 1311 /* init all strings */ 1312 if (!list_empty(&gi->string_list)) { 1313 struct gadget_strings *gs; 1314 1315 i = 0; 1316 list_for_each_entry(gs, &gi->string_list, list) { 1317 1318 gi->gstrings[i] = &gs->stringtab_dev; 1319 gs->stringtab_dev.strings = gs->strings; 1320 gs->strings[USB_GADGET_MANUFACTURER_IDX].s = 1321 gs->manufacturer; 1322 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product; 1323 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber; 1324 i++; 1325 } 1326 gi->gstrings[i] = NULL; 1327 s = usb_gstrings_attach(&gi->cdev, gi->gstrings, 1328 USB_GADGET_FIRST_AVAIL_IDX); 1329 if (IS_ERR(s)) { 1330 ret = PTR_ERR(s); 1331 goto err_comp_cleanup; 1332 } 1333 1334 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1335 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1336 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1337 } 1338 1339 if (gi->use_os_desc) { 1340 cdev->use_os_string = true; 1341 cdev->b_vendor_code = gi->b_vendor_code; 1342 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1343 } 1344 1345 if (gadget_is_otg(gadget) && !otg_desc[0]) { 1346 struct usb_descriptor_header *usb_desc; 1347 1348 usb_desc = usb_otg_descriptor_alloc(gadget); 1349 if (!usb_desc) { 1350 ret = -ENOMEM; 1351 goto err_comp_cleanup; 1352 } 1353 usb_otg_descriptor_init(gadget, usb_desc); 1354 otg_desc[0] = usb_desc; 1355 otg_desc[1] = NULL; 1356 } 1357 1358 /* Go through all configs, attach all functions */ 1359 list_for_each_entry(c, &gi->cdev.configs, list) { 1360 struct config_usb_cfg *cfg; 1361 struct usb_function *f; 1362 struct usb_function *tmp; 1363 struct gadget_config_name *cn; 1364 1365 if (gadget_is_otg(gadget)) 1366 c->descriptors = otg_desc; 1367 1368 cfg = container_of(c, struct config_usb_cfg, c); 1369 if (!list_empty(&cfg->string_list)) { 1370 i = 0; 1371 list_for_each_entry(cn, &cfg->string_list, list) { 1372 cfg->gstrings[i] = &cn->stringtab_dev; 1373 cn->stringtab_dev.strings = &cn->strings; 1374 cn->strings.s = cn->configuration; 1375 i++; 1376 } 1377 cfg->gstrings[i] = NULL; 1378 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1379 if (IS_ERR(s)) { 1380 ret = PTR_ERR(s); 1381 goto err_comp_cleanup; 1382 } 1383 c->iConfiguration = s[0].id; 1384 } 1385 1386 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1387 list_del(&f->list); 1388 ret = usb_add_function(c, f); 1389 if (ret) { 1390 list_add(&f->list, &cfg->func_list); 1391 goto err_purge_funcs; 1392 } 1393 } 1394 ret = usb_gadget_check_config(cdev->gadget); 1395 if (ret) 1396 goto err_purge_funcs; 1397 1398 usb_ep_autoconfig_reset(cdev->gadget); 1399 } 1400 if (cdev->use_os_string) { 1401 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1402 if (ret) 1403 goto err_purge_funcs; 1404 } 1405 1406 usb_ep_autoconfig_reset(cdev->gadget); 1407 return 0; 1408 1409 err_purge_funcs: 1410 purge_configs_funcs(gi); 1411 err_comp_cleanup: 1412 composite_dev_cleanup(cdev); 1413 return ret; 1414 } 1415 1416 static void configfs_composite_unbind(struct usb_gadget *gadget) 1417 { 1418 struct usb_composite_dev *cdev; 1419 struct gadget_info *gi; 1420 unsigned long flags; 1421 1422 /* the gi->lock is hold by the caller */ 1423 1424 cdev = get_gadget_data(gadget); 1425 gi = container_of(cdev, struct gadget_info, cdev); 1426 spin_lock_irqsave(&gi->spinlock, flags); 1427 gi->unbind = 1; 1428 spin_unlock_irqrestore(&gi->spinlock, flags); 1429 1430 kfree(otg_desc[0]); 1431 otg_desc[0] = NULL; 1432 purge_configs_funcs(gi); 1433 composite_dev_cleanup(cdev); 1434 usb_ep_autoconfig_reset(cdev->gadget); 1435 spin_lock_irqsave(&gi->spinlock, flags); 1436 cdev->gadget = NULL; 1437 set_gadget_data(gadget, NULL); 1438 spin_unlock_irqrestore(&gi->spinlock, flags); 1439 } 1440 1441 static int configfs_composite_setup(struct usb_gadget *gadget, 1442 const struct usb_ctrlrequest *ctrl) 1443 { 1444 struct usb_composite_dev *cdev; 1445 struct gadget_info *gi; 1446 unsigned long flags; 1447 int ret; 1448 1449 cdev = get_gadget_data(gadget); 1450 if (!cdev) 1451 return 0; 1452 1453 gi = container_of(cdev, struct gadget_info, cdev); 1454 spin_lock_irqsave(&gi->spinlock, flags); 1455 cdev = get_gadget_data(gadget); 1456 if (!cdev || gi->unbind) { 1457 spin_unlock_irqrestore(&gi->spinlock, flags); 1458 return 0; 1459 } 1460 1461 ret = composite_setup(gadget, ctrl); 1462 spin_unlock_irqrestore(&gi->spinlock, flags); 1463 return ret; 1464 } 1465 1466 static void configfs_composite_disconnect(struct usb_gadget *gadget) 1467 { 1468 struct usb_composite_dev *cdev; 1469 struct gadget_info *gi; 1470 unsigned long flags; 1471 1472 cdev = get_gadget_data(gadget); 1473 if (!cdev) 1474 return; 1475 1476 gi = container_of(cdev, struct gadget_info, cdev); 1477 spin_lock_irqsave(&gi->spinlock, flags); 1478 cdev = get_gadget_data(gadget); 1479 if (!cdev || gi->unbind) { 1480 spin_unlock_irqrestore(&gi->spinlock, flags); 1481 return; 1482 } 1483 1484 composite_disconnect(gadget); 1485 spin_unlock_irqrestore(&gi->spinlock, flags); 1486 } 1487 1488 static void configfs_composite_reset(struct usb_gadget *gadget) 1489 { 1490 struct usb_composite_dev *cdev; 1491 struct gadget_info *gi; 1492 unsigned long flags; 1493 1494 cdev = get_gadget_data(gadget); 1495 if (!cdev) 1496 return; 1497 1498 gi = container_of(cdev, struct gadget_info, cdev); 1499 spin_lock_irqsave(&gi->spinlock, flags); 1500 cdev = get_gadget_data(gadget); 1501 if (!cdev || gi->unbind) { 1502 spin_unlock_irqrestore(&gi->spinlock, flags); 1503 return; 1504 } 1505 1506 composite_reset(gadget); 1507 spin_unlock_irqrestore(&gi->spinlock, flags); 1508 } 1509 1510 static void configfs_composite_suspend(struct usb_gadget *gadget) 1511 { 1512 struct usb_composite_dev *cdev; 1513 struct gadget_info *gi; 1514 unsigned long flags; 1515 1516 cdev = get_gadget_data(gadget); 1517 if (!cdev) 1518 return; 1519 1520 gi = container_of(cdev, struct gadget_info, cdev); 1521 spin_lock_irqsave(&gi->spinlock, flags); 1522 cdev = get_gadget_data(gadget); 1523 if (!cdev || gi->unbind) { 1524 spin_unlock_irqrestore(&gi->spinlock, flags); 1525 return; 1526 } 1527 1528 composite_suspend(gadget); 1529 spin_unlock_irqrestore(&gi->spinlock, flags); 1530 } 1531 1532 static void configfs_composite_resume(struct usb_gadget *gadget) 1533 { 1534 struct usb_composite_dev *cdev; 1535 struct gadget_info *gi; 1536 unsigned long flags; 1537 1538 cdev = get_gadget_data(gadget); 1539 if (!cdev) 1540 return; 1541 1542 gi = container_of(cdev, struct gadget_info, cdev); 1543 spin_lock_irqsave(&gi->spinlock, flags); 1544 cdev = get_gadget_data(gadget); 1545 if (!cdev || gi->unbind) { 1546 spin_unlock_irqrestore(&gi->spinlock, flags); 1547 return; 1548 } 1549 1550 composite_resume(gadget); 1551 spin_unlock_irqrestore(&gi->spinlock, flags); 1552 } 1553 1554 static const struct usb_gadget_driver configfs_driver_template = { 1555 .bind = configfs_composite_bind, 1556 .unbind = configfs_composite_unbind, 1557 1558 .setup = configfs_composite_setup, 1559 .reset = configfs_composite_reset, 1560 .disconnect = configfs_composite_disconnect, 1561 1562 .suspend = configfs_composite_suspend, 1563 .resume = configfs_composite_resume, 1564 1565 .max_speed = USB_SPEED_SUPER_PLUS, 1566 .driver = { 1567 .owner = THIS_MODULE, 1568 .name = "configfs-gadget", 1569 }, 1570 .match_existing_only = 1, 1571 }; 1572 1573 static struct config_group *gadgets_make( 1574 struct config_group *group, 1575 const char *name) 1576 { 1577 struct gadget_info *gi; 1578 1579 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1580 if (!gi) 1581 return ERR_PTR(-ENOMEM); 1582 1583 config_group_init_type_name(&gi->group, name, &gadget_root_type); 1584 1585 config_group_init_type_name(&gi->functions_group, "functions", 1586 &functions_type); 1587 configfs_add_default_group(&gi->functions_group, &gi->group); 1588 1589 config_group_init_type_name(&gi->configs_group, "configs", 1590 &config_desc_type); 1591 configfs_add_default_group(&gi->configs_group, &gi->group); 1592 1593 config_group_init_type_name(&gi->strings_group, "strings", 1594 &gadget_strings_strings_type); 1595 configfs_add_default_group(&gi->strings_group, &gi->group); 1596 1597 config_group_init_type_name(&gi->os_desc_group, "os_desc", 1598 &os_desc_type); 1599 configfs_add_default_group(&gi->os_desc_group, &gi->group); 1600 1601 gi->composite.bind = configfs_do_nothing; 1602 gi->composite.unbind = configfs_do_nothing; 1603 gi->composite.suspend = NULL; 1604 gi->composite.resume = NULL; 1605 gi->composite.max_speed = USB_SPEED_SUPER_PLUS; 1606 1607 spin_lock_init(&gi->spinlock); 1608 mutex_init(&gi->lock); 1609 INIT_LIST_HEAD(&gi->string_list); 1610 INIT_LIST_HEAD(&gi->available_func); 1611 1612 composite_init_dev(&gi->cdev); 1613 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 1614 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 1615 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 1616 1617 gi->composite.gadget_driver = configfs_driver_template; 1618 1619 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 1620 gi->composite.name = gi->composite.gadget_driver.function; 1621 1622 if (!gi->composite.gadget_driver.function) 1623 goto err; 1624 1625 return &gi->group; 1626 err: 1627 kfree(gi); 1628 return ERR_PTR(-ENOMEM); 1629 } 1630 1631 static void gadgets_drop(struct config_group *group, struct config_item *item) 1632 { 1633 config_item_put(item); 1634 } 1635 1636 static struct configfs_group_operations gadgets_ops = { 1637 .make_group = &gadgets_make, 1638 .drop_item = &gadgets_drop, 1639 }; 1640 1641 static const struct config_item_type gadgets_type = { 1642 .ct_group_ops = &gadgets_ops, 1643 .ct_owner = THIS_MODULE, 1644 }; 1645 1646 static struct configfs_subsystem gadget_subsys = { 1647 .su_group = { 1648 .cg_item = { 1649 .ci_namebuf = "usb_gadget", 1650 .ci_type = &gadgets_type, 1651 }, 1652 }, 1653 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 1654 }; 1655 1656 void unregister_gadget_item(struct config_item *item) 1657 { 1658 struct gadget_info *gi = to_gadget_info(item); 1659 1660 mutex_lock(&gi->lock); 1661 unregister_gadget(gi); 1662 mutex_unlock(&gi->lock); 1663 } 1664 EXPORT_SYMBOL_GPL(unregister_gadget_item); 1665 1666 static int __init gadget_cfs_init(void) 1667 { 1668 int ret; 1669 1670 config_group_init(&gadget_subsys.su_group); 1671 1672 ret = configfs_register_subsystem(&gadget_subsys); 1673 return ret; 1674 } 1675 module_init(gadget_cfs_init); 1676 1677 static void __exit gadget_cfs_exit(void) 1678 { 1679 configfs_unregister_subsystem(&gadget_subsys); 1680 } 1681 module_exit(gadget_cfs_exit); 1682