1 #include <linux/configfs.h> 2 #include <linux/module.h> 3 #include <linux/slab.h> 4 #include <linux/device.h> 5 #include <linux/nls.h> 6 #include <linux/usb/composite.h> 7 #include <linux/usb/gadget_configfs.h> 8 #include "configfs.h" 9 #include "u_f.h" 10 #include "u_os_desc.h" 11 12 int check_user_usb_string(const char *name, 13 struct usb_gadget_strings *stringtab_dev) 14 { 15 unsigned primary_lang; 16 unsigned sub_lang; 17 u16 num; 18 int ret; 19 20 ret = kstrtou16(name, 0, &num); 21 if (ret) 22 return ret; 23 24 primary_lang = num & 0x3ff; 25 sub_lang = num >> 10; 26 27 /* simple sanity check for valid langid */ 28 switch (primary_lang) { 29 case 0: 30 case 0x62 ... 0xfe: 31 case 0x100 ... 0x3ff: 32 return -EINVAL; 33 } 34 if (!sub_lang) 35 return -EINVAL; 36 37 stringtab_dev->language = num; 38 return 0; 39 } 40 41 #define MAX_NAME_LEN 40 42 #define MAX_USB_STRING_LANGS 2 43 44 struct gadget_info { 45 struct config_group group; 46 struct config_group functions_group; 47 struct config_group configs_group; 48 struct config_group strings_group; 49 struct config_group os_desc_group; 50 struct config_group *default_groups[5]; 51 52 struct mutex lock; 53 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1]; 54 struct list_head string_list; 55 struct list_head available_func; 56 57 const char *udc_name; 58 #ifdef CONFIG_USB_OTG 59 struct usb_otg_descriptor otg; 60 #endif 61 struct usb_composite_driver composite; 62 struct usb_composite_dev cdev; 63 bool use_os_desc; 64 char b_vendor_code; 65 char qw_sign[OS_STRING_QW_SIGN_LEN]; 66 }; 67 68 struct config_usb_cfg { 69 struct config_group group; 70 struct config_group strings_group; 71 struct config_group *default_groups[2]; 72 struct list_head string_list; 73 struct usb_configuration c; 74 struct list_head func_list; 75 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1]; 76 }; 77 78 struct gadget_strings { 79 struct usb_gadget_strings stringtab_dev; 80 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX]; 81 char *manufacturer; 82 char *product; 83 char *serialnumber; 84 85 struct config_group group; 86 struct list_head list; 87 }; 88 89 struct os_desc { 90 struct config_group group; 91 }; 92 93 struct gadget_config_name { 94 struct usb_gadget_strings stringtab_dev; 95 struct usb_string strings; 96 char *configuration; 97 98 struct config_group group; 99 struct list_head list; 100 }; 101 102 static int usb_string_copy(const char *s, char **s_copy) 103 { 104 int ret; 105 char *str; 106 char *copy = *s_copy; 107 ret = strlen(s); 108 if (ret > 126) 109 return -EOVERFLOW; 110 111 str = kstrdup(s, GFP_KERNEL); 112 if (!str) 113 return -ENOMEM; 114 if (str[ret - 1] == '\n') 115 str[ret - 1] = '\0'; 116 kfree(copy); 117 *s_copy = str; 118 return 0; 119 } 120 121 CONFIGFS_ATTR_STRUCT(gadget_info); 122 CONFIGFS_ATTR_STRUCT(config_usb_cfg); 123 124 #define GI_DEVICE_DESC_ITEM_ATTR(name) \ 125 static struct gadget_info_attribute gadget_cdev_desc_##name = \ 126 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \ 127 gadget_dev_desc_##name##_show, \ 128 gadget_dev_desc_##name##_store) 129 130 #define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \ 131 static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \ 132 char *page) \ 133 { \ 134 return sprintf(page, "0x%02x\n", gi->cdev.desc.__name); \ 135 } 136 137 #define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \ 138 static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \ 139 char *page) \ 140 { \ 141 return sprintf(page, "0x%04x\n", le16_to_cpup(&gi->cdev.desc.__name)); \ 142 } 143 144 145 #define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \ 146 static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \ 147 const char *page, size_t len) \ 148 { \ 149 u8 val; \ 150 int ret; \ 151 ret = kstrtou8(page, 0, &val); \ 152 if (ret) \ 153 return ret; \ 154 gi->cdev.desc._name = val; \ 155 return len; \ 156 } 157 158 #define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \ 159 static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \ 160 const char *page, size_t len) \ 161 { \ 162 u16 val; \ 163 int ret; \ 164 ret = kstrtou16(page, 0, &val); \ 165 if (ret) \ 166 return ret; \ 167 gi->cdev.desc._name = cpu_to_le16p(&val); \ 168 return len; \ 169 } 170 171 #define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \ 172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \ 173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name) 174 175 GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB); 176 GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8); 177 GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8); 178 GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8); 179 GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8); 180 GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16); 181 GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16); 182 GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice); 183 184 static ssize_t is_valid_bcd(u16 bcd_val) 185 { 186 if ((bcd_val & 0xf) > 9) 187 return -EINVAL; 188 if (((bcd_val >> 4) & 0xf) > 9) 189 return -EINVAL; 190 if (((bcd_val >> 8) & 0xf) > 9) 191 return -EINVAL; 192 if (((bcd_val >> 12) & 0xf) > 9) 193 return -EINVAL; 194 return 0; 195 } 196 197 static ssize_t gadget_dev_desc_bcdDevice_store(struct gadget_info *gi, 198 const char *page, size_t len) 199 { 200 u16 bcdDevice; 201 int ret; 202 203 ret = kstrtou16(page, 0, &bcdDevice); 204 if (ret) 205 return ret; 206 ret = is_valid_bcd(bcdDevice); 207 if (ret) 208 return ret; 209 210 gi->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice); 211 return len; 212 } 213 214 static ssize_t gadget_dev_desc_bcdUSB_store(struct gadget_info *gi, 215 const char *page, size_t len) 216 { 217 u16 bcdUSB; 218 int ret; 219 220 ret = kstrtou16(page, 0, &bcdUSB); 221 if (ret) 222 return ret; 223 ret = is_valid_bcd(bcdUSB); 224 if (ret) 225 return ret; 226 227 gi->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB); 228 return len; 229 } 230 231 static ssize_t gadget_dev_desc_UDC_show(struct gadget_info *gi, char *page) 232 { 233 return sprintf(page, "%s\n", gi->udc_name ?: ""); 234 } 235 236 static int unregister_gadget(struct gadget_info *gi) 237 { 238 int ret; 239 240 if (!gi->udc_name) 241 return -ENODEV; 242 243 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver); 244 if (ret) 245 return ret; 246 kfree(gi->udc_name); 247 gi->udc_name = NULL; 248 return 0; 249 } 250 251 static ssize_t gadget_dev_desc_UDC_store(struct gadget_info *gi, 252 const char *page, size_t len) 253 { 254 char *name; 255 int ret; 256 257 name = kstrdup(page, GFP_KERNEL); 258 if (!name) 259 return -ENOMEM; 260 if (name[len - 1] == '\n') 261 name[len - 1] = '\0'; 262 263 mutex_lock(&gi->lock); 264 265 if (!strlen(name)) { 266 ret = unregister_gadget(gi); 267 if (ret) 268 goto err; 269 } else { 270 if (gi->udc_name) { 271 ret = -EBUSY; 272 goto err; 273 } 274 ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver); 275 if (ret) 276 goto err; 277 gi->udc_name = name; 278 } 279 mutex_unlock(&gi->lock); 280 return len; 281 err: 282 kfree(name); 283 mutex_unlock(&gi->lock); 284 return ret; 285 } 286 287 GI_DEVICE_DESC_ITEM_ATTR(bDeviceClass); 288 GI_DEVICE_DESC_ITEM_ATTR(bDeviceSubClass); 289 GI_DEVICE_DESC_ITEM_ATTR(bDeviceProtocol); 290 GI_DEVICE_DESC_ITEM_ATTR(bMaxPacketSize0); 291 GI_DEVICE_DESC_ITEM_ATTR(idVendor); 292 GI_DEVICE_DESC_ITEM_ATTR(idProduct); 293 GI_DEVICE_DESC_ITEM_ATTR(bcdDevice); 294 GI_DEVICE_DESC_ITEM_ATTR(bcdUSB); 295 GI_DEVICE_DESC_ITEM_ATTR(UDC); 296 297 static struct configfs_attribute *gadget_root_attrs[] = { 298 &gadget_cdev_desc_bDeviceClass.attr, 299 &gadget_cdev_desc_bDeviceSubClass.attr, 300 &gadget_cdev_desc_bDeviceProtocol.attr, 301 &gadget_cdev_desc_bMaxPacketSize0.attr, 302 &gadget_cdev_desc_idVendor.attr, 303 &gadget_cdev_desc_idProduct.attr, 304 &gadget_cdev_desc_bcdDevice.attr, 305 &gadget_cdev_desc_bcdUSB.attr, 306 &gadget_cdev_desc_UDC.attr, 307 NULL, 308 }; 309 310 static inline struct gadget_info *to_gadget_info(struct config_item *item) 311 { 312 return container_of(to_config_group(item), struct gadget_info, group); 313 } 314 315 static inline struct gadget_strings *to_gadget_strings(struct config_item *item) 316 { 317 return container_of(to_config_group(item), struct gadget_strings, 318 group); 319 } 320 321 static inline struct gadget_config_name *to_gadget_config_name( 322 struct config_item *item) 323 { 324 return container_of(to_config_group(item), struct gadget_config_name, 325 group); 326 } 327 328 static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item) 329 { 330 return container_of(to_config_group(item), struct config_usb_cfg, 331 group); 332 } 333 334 static inline struct usb_function_instance *to_usb_function_instance( 335 struct config_item *item) 336 { 337 return container_of(to_config_group(item), 338 struct usb_function_instance, group); 339 } 340 341 static void gadget_info_attr_release(struct config_item *item) 342 { 343 struct gadget_info *gi = to_gadget_info(item); 344 345 WARN_ON(!list_empty(&gi->cdev.configs)); 346 WARN_ON(!list_empty(&gi->string_list)); 347 WARN_ON(!list_empty(&gi->available_func)); 348 kfree(gi->composite.gadget_driver.function); 349 kfree(gi); 350 } 351 352 CONFIGFS_ATTR_OPS(gadget_info); 353 354 static struct configfs_item_operations gadget_root_item_ops = { 355 .release = gadget_info_attr_release, 356 .show_attribute = gadget_info_attr_show, 357 .store_attribute = gadget_info_attr_store, 358 }; 359 360 static void gadget_config_attr_release(struct config_item *item) 361 { 362 struct config_usb_cfg *cfg = to_config_usb_cfg(item); 363 364 WARN_ON(!list_empty(&cfg->c.functions)); 365 list_del(&cfg->c.list); 366 kfree(cfg->c.label); 367 kfree(cfg); 368 } 369 370 static int config_usb_cfg_link( 371 struct config_item *usb_cfg_ci, 372 struct config_item *usb_func_ci) 373 { 374 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 375 struct usb_composite_dev *cdev = cfg->c.cdev; 376 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev); 377 378 struct config_group *group = to_config_group(usb_func_ci); 379 struct usb_function_instance *fi = container_of(group, 380 struct usb_function_instance, group); 381 struct usb_function_instance *a_fi; 382 struct usb_function *f; 383 int ret; 384 385 mutex_lock(&gi->lock); 386 /* 387 * Make sure this function is from within our _this_ gadget and not 388 * from another gadget or a random directory. 389 * Also a function instance can only be linked once. 390 */ 391 list_for_each_entry(a_fi, &gi->available_func, cfs_list) { 392 if (a_fi == fi) 393 break; 394 } 395 if (a_fi != fi) { 396 ret = -EINVAL; 397 goto out; 398 } 399 400 list_for_each_entry(f, &cfg->func_list, list) { 401 if (f->fi == fi) { 402 ret = -EEXIST; 403 goto out; 404 } 405 } 406 407 f = usb_get_function(fi); 408 if (IS_ERR(f)) { 409 ret = PTR_ERR(f); 410 goto out; 411 } 412 413 /* stash the function until we bind it to the gadget */ 414 list_add_tail(&f->list, &cfg->func_list); 415 ret = 0; 416 out: 417 mutex_unlock(&gi->lock); 418 return ret; 419 } 420 421 static int config_usb_cfg_unlink( 422 struct config_item *usb_cfg_ci, 423 struct config_item *usb_func_ci) 424 { 425 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci); 426 struct usb_composite_dev *cdev = cfg->c.cdev; 427 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev); 428 429 struct config_group *group = to_config_group(usb_func_ci); 430 struct usb_function_instance *fi = container_of(group, 431 struct usb_function_instance, group); 432 struct usb_function *f; 433 434 /* 435 * ideally I would like to forbid to unlink functions while a gadget is 436 * bound to an UDC. Since this isn't possible at the moment, we simply 437 * force an unbind, the function is available here and then we can 438 * remove the function. 439 */ 440 mutex_lock(&gi->lock); 441 if (gi->udc_name) 442 unregister_gadget(gi); 443 WARN_ON(gi->udc_name); 444 445 list_for_each_entry(f, &cfg->func_list, list) { 446 if (f->fi == fi) { 447 list_del(&f->list); 448 usb_put_function(f); 449 mutex_unlock(&gi->lock); 450 return 0; 451 } 452 } 453 mutex_unlock(&gi->lock); 454 WARN(1, "Unable to locate function to unbind\n"); 455 return 0; 456 } 457 458 CONFIGFS_ATTR_OPS(config_usb_cfg); 459 460 static struct configfs_item_operations gadget_config_item_ops = { 461 .release = gadget_config_attr_release, 462 .show_attribute = config_usb_cfg_attr_show, 463 .store_attribute = config_usb_cfg_attr_store, 464 .allow_link = config_usb_cfg_link, 465 .drop_link = config_usb_cfg_unlink, 466 }; 467 468 469 static ssize_t gadget_config_desc_MaxPower_show(struct config_usb_cfg *cfg, 470 char *page) 471 { 472 return sprintf(page, "%u\n", cfg->c.MaxPower); 473 } 474 475 static ssize_t gadget_config_desc_MaxPower_store(struct config_usb_cfg *cfg, 476 const char *page, size_t len) 477 { 478 u16 val; 479 int ret; 480 ret = kstrtou16(page, 0, &val); 481 if (ret) 482 return ret; 483 if (DIV_ROUND_UP(val, 8) > 0xff) 484 return -ERANGE; 485 cfg->c.MaxPower = val; 486 return len; 487 } 488 489 static ssize_t gadget_config_desc_bmAttributes_show(struct config_usb_cfg *cfg, 490 char *page) 491 { 492 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes); 493 } 494 495 static ssize_t gadget_config_desc_bmAttributes_store(struct config_usb_cfg *cfg, 496 const char *page, size_t len) 497 { 498 u8 val; 499 int ret; 500 ret = kstrtou8(page, 0, &val); 501 if (ret) 502 return ret; 503 if (!(val & USB_CONFIG_ATT_ONE)) 504 return -EINVAL; 505 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER | 506 USB_CONFIG_ATT_WAKEUP)) 507 return -EINVAL; 508 cfg->c.bmAttributes = val; 509 return len; 510 } 511 512 #define CFG_CONFIG_DESC_ITEM_ATTR(name) \ 513 static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \ 514 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \ 515 gadget_config_desc_##name##_show, \ 516 gadget_config_desc_##name##_store) 517 518 CFG_CONFIG_DESC_ITEM_ATTR(MaxPower); 519 CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes); 520 521 static struct configfs_attribute *gadget_config_attrs[] = { 522 &gadget_usb_cfg_MaxPower.attr, 523 &gadget_usb_cfg_bmAttributes.attr, 524 NULL, 525 }; 526 527 static struct config_item_type gadget_config_type = { 528 .ct_item_ops = &gadget_config_item_ops, 529 .ct_attrs = gadget_config_attrs, 530 .ct_owner = THIS_MODULE, 531 }; 532 533 static struct config_item_type gadget_root_type = { 534 .ct_item_ops = &gadget_root_item_ops, 535 .ct_attrs = gadget_root_attrs, 536 .ct_owner = THIS_MODULE, 537 }; 538 539 static void composite_init_dev(struct usb_composite_dev *cdev) 540 { 541 spin_lock_init(&cdev->lock); 542 INIT_LIST_HEAD(&cdev->configs); 543 INIT_LIST_HEAD(&cdev->gstrings); 544 } 545 546 static struct config_group *function_make( 547 struct config_group *group, 548 const char *name) 549 { 550 struct gadget_info *gi; 551 struct usb_function_instance *fi; 552 char buf[MAX_NAME_LEN]; 553 char *func_name; 554 char *instance_name; 555 int ret; 556 557 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 558 if (ret >= MAX_NAME_LEN) 559 return ERR_PTR(-ENAMETOOLONG); 560 561 func_name = buf; 562 instance_name = strchr(func_name, '.'); 563 if (!instance_name) { 564 pr_err("Unable to locate . in FUNC.INSTANCE\n"); 565 return ERR_PTR(-EINVAL); 566 } 567 *instance_name = '\0'; 568 instance_name++; 569 570 fi = usb_get_function_instance(func_name); 571 if (IS_ERR(fi)) 572 return ERR_CAST(fi); 573 574 ret = config_item_set_name(&fi->group.cg_item, name); 575 if (ret) { 576 usb_put_function_instance(fi); 577 return ERR_PTR(ret); 578 } 579 if (fi->set_inst_name) { 580 ret = fi->set_inst_name(fi, instance_name); 581 if (ret) { 582 usb_put_function_instance(fi); 583 return ERR_PTR(ret); 584 } 585 } 586 587 gi = container_of(group, struct gadget_info, functions_group); 588 589 mutex_lock(&gi->lock); 590 list_add_tail(&fi->cfs_list, &gi->available_func); 591 mutex_unlock(&gi->lock); 592 return &fi->group; 593 } 594 595 static void function_drop( 596 struct config_group *group, 597 struct config_item *item) 598 { 599 struct usb_function_instance *fi = to_usb_function_instance(item); 600 struct gadget_info *gi; 601 602 gi = container_of(group, struct gadget_info, functions_group); 603 604 mutex_lock(&gi->lock); 605 list_del(&fi->cfs_list); 606 mutex_unlock(&gi->lock); 607 config_item_put(item); 608 } 609 610 static struct configfs_group_operations functions_ops = { 611 .make_group = &function_make, 612 .drop_item = &function_drop, 613 }; 614 615 static struct config_item_type functions_type = { 616 .ct_group_ops = &functions_ops, 617 .ct_owner = THIS_MODULE, 618 }; 619 620 CONFIGFS_ATTR_STRUCT(gadget_config_name); 621 GS_STRINGS_RW(gadget_config_name, configuration); 622 623 static struct configfs_attribute *gadget_config_name_langid_attrs[] = { 624 &gadget_config_name_configuration.attr, 625 NULL, 626 }; 627 628 static void gadget_config_name_attr_release(struct config_item *item) 629 { 630 struct gadget_config_name *cn = to_gadget_config_name(item); 631 632 kfree(cn->configuration); 633 634 list_del(&cn->list); 635 kfree(cn); 636 } 637 638 USB_CONFIG_STRING_RW_OPS(gadget_config_name); 639 USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg); 640 641 static struct config_group *config_desc_make( 642 struct config_group *group, 643 const char *name) 644 { 645 struct gadget_info *gi; 646 struct config_usb_cfg *cfg; 647 char buf[MAX_NAME_LEN]; 648 char *num_str; 649 u8 num; 650 int ret; 651 652 gi = container_of(group, struct gadget_info, configs_group); 653 ret = snprintf(buf, MAX_NAME_LEN, "%s", name); 654 if (ret >= MAX_NAME_LEN) 655 return ERR_PTR(-ENAMETOOLONG); 656 657 num_str = strchr(buf, '.'); 658 if (!num_str) { 659 pr_err("Unable to locate . in name.bConfigurationValue\n"); 660 return ERR_PTR(-EINVAL); 661 } 662 663 *num_str = '\0'; 664 num_str++; 665 666 if (!strlen(buf)) 667 return ERR_PTR(-EINVAL); 668 669 ret = kstrtou8(num_str, 0, &num); 670 if (ret) 671 return ERR_PTR(ret); 672 673 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); 674 if (!cfg) 675 return ERR_PTR(-ENOMEM); 676 cfg->c.label = kstrdup(buf, GFP_KERNEL); 677 if (!cfg->c.label) { 678 ret = -ENOMEM; 679 goto err; 680 } 681 cfg->c.bConfigurationValue = num; 682 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW; 683 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE; 684 INIT_LIST_HEAD(&cfg->string_list); 685 INIT_LIST_HEAD(&cfg->func_list); 686 687 cfg->group.default_groups = cfg->default_groups; 688 cfg->default_groups[0] = &cfg->strings_group; 689 690 config_group_init_type_name(&cfg->group, name, 691 &gadget_config_type); 692 config_group_init_type_name(&cfg->strings_group, "strings", 693 &gadget_config_name_strings_type); 694 695 ret = usb_add_config_only(&gi->cdev, &cfg->c); 696 if (ret) 697 goto err; 698 699 return &cfg->group; 700 err: 701 kfree(cfg->c.label); 702 kfree(cfg); 703 return ERR_PTR(ret); 704 } 705 706 static void config_desc_drop( 707 struct config_group *group, 708 struct config_item *item) 709 { 710 config_item_put(item); 711 } 712 713 static struct configfs_group_operations config_desc_ops = { 714 .make_group = &config_desc_make, 715 .drop_item = &config_desc_drop, 716 }; 717 718 static struct config_item_type config_desc_type = { 719 .ct_group_ops = &config_desc_ops, 720 .ct_owner = THIS_MODULE, 721 }; 722 723 CONFIGFS_ATTR_STRUCT(gadget_strings); 724 GS_STRINGS_RW(gadget_strings, manufacturer); 725 GS_STRINGS_RW(gadget_strings, product); 726 GS_STRINGS_RW(gadget_strings, serialnumber); 727 728 static struct configfs_attribute *gadget_strings_langid_attrs[] = { 729 &gadget_strings_manufacturer.attr, 730 &gadget_strings_product.attr, 731 &gadget_strings_serialnumber.attr, 732 NULL, 733 }; 734 735 static void gadget_strings_attr_release(struct config_item *item) 736 { 737 struct gadget_strings *gs = to_gadget_strings(item); 738 739 kfree(gs->manufacturer); 740 kfree(gs->product); 741 kfree(gs->serialnumber); 742 743 list_del(&gs->list); 744 kfree(gs); 745 } 746 747 USB_CONFIG_STRING_RW_OPS(gadget_strings); 748 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info); 749 750 static inline struct os_desc *to_os_desc(struct config_item *item) 751 { 752 return container_of(to_config_group(item), struct os_desc, group); 753 } 754 755 CONFIGFS_ATTR_STRUCT(os_desc); 756 CONFIGFS_ATTR_OPS(os_desc); 757 758 static ssize_t os_desc_use_show(struct os_desc *os_desc, char *page) 759 { 760 struct gadget_info *gi; 761 762 gi = to_gadget_info(os_desc->group.cg_item.ci_parent); 763 764 return sprintf(page, "%d", gi->use_os_desc); 765 } 766 767 static ssize_t os_desc_use_store(struct os_desc *os_desc, const char *page, 768 size_t len) 769 { 770 struct gadget_info *gi; 771 int ret; 772 bool use; 773 774 gi = to_gadget_info(os_desc->group.cg_item.ci_parent); 775 776 mutex_lock(&gi->lock); 777 ret = strtobool(page, &use); 778 if (!ret) { 779 gi->use_os_desc = use; 780 ret = len; 781 } 782 mutex_unlock(&gi->lock); 783 784 return ret; 785 } 786 787 static struct os_desc_attribute os_desc_use = 788 __CONFIGFS_ATTR(use, S_IRUGO | S_IWUSR, 789 os_desc_use_show, 790 os_desc_use_store); 791 792 static ssize_t os_desc_b_vendor_code_show(struct os_desc *os_desc, char *page) 793 { 794 struct gadget_info *gi; 795 796 gi = to_gadget_info(os_desc->group.cg_item.ci_parent); 797 798 return sprintf(page, "%d", gi->b_vendor_code); 799 } 800 801 static ssize_t os_desc_b_vendor_code_store(struct os_desc *os_desc, 802 const char *page, size_t len) 803 { 804 struct gadget_info *gi; 805 int ret; 806 u8 b_vendor_code; 807 808 gi = to_gadget_info(os_desc->group.cg_item.ci_parent); 809 810 mutex_lock(&gi->lock); 811 ret = kstrtou8(page, 0, &b_vendor_code); 812 if (!ret) { 813 gi->b_vendor_code = b_vendor_code; 814 ret = len; 815 } 816 mutex_unlock(&gi->lock); 817 818 return ret; 819 } 820 821 static struct os_desc_attribute os_desc_b_vendor_code = 822 __CONFIGFS_ATTR(b_vendor_code, S_IRUGO | S_IWUSR, 823 os_desc_b_vendor_code_show, 824 os_desc_b_vendor_code_store); 825 826 static ssize_t os_desc_qw_sign_show(struct os_desc *os_desc, char *page) 827 { 828 struct gadget_info *gi; 829 830 gi = to_gadget_info(os_desc->group.cg_item.ci_parent); 831 832 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 833 834 return OS_STRING_QW_SIGN_LEN; 835 } 836 837 static ssize_t os_desc_qw_sign_store(struct os_desc *os_desc, const char *page, 838 size_t len) 839 { 840 struct gadget_info *gi; 841 int res, l; 842 843 gi = to_gadget_info(os_desc->group.cg_item.ci_parent); 844 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); 845 if (page[l - 1] == '\n') 846 --l; 847 848 mutex_lock(&gi->lock); 849 res = utf8s_to_utf16s(page, l, 850 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, 851 OS_STRING_QW_SIGN_LEN); 852 if (res > 0) 853 res = len; 854 mutex_unlock(&gi->lock); 855 856 return res; 857 } 858 859 static struct os_desc_attribute os_desc_qw_sign = 860 __CONFIGFS_ATTR(qw_sign, S_IRUGO | S_IWUSR, 861 os_desc_qw_sign_show, 862 os_desc_qw_sign_store); 863 864 static struct configfs_attribute *os_desc_attrs[] = { 865 &os_desc_use.attr, 866 &os_desc_b_vendor_code.attr, 867 &os_desc_qw_sign.attr, 868 NULL, 869 }; 870 871 static void os_desc_attr_release(struct config_item *item) 872 { 873 struct os_desc *os_desc = to_os_desc(item); 874 kfree(os_desc); 875 } 876 877 static int os_desc_link(struct config_item *os_desc_ci, 878 struct config_item *usb_cfg_ci) 879 { 880 struct gadget_info *gi = container_of(to_config_group(os_desc_ci), 881 struct gadget_info, os_desc_group); 882 struct usb_composite_dev *cdev = &gi->cdev; 883 struct config_usb_cfg *c_target = 884 container_of(to_config_group(usb_cfg_ci), 885 struct config_usb_cfg, group); 886 struct usb_configuration *c; 887 int ret; 888 889 mutex_lock(&gi->lock); 890 list_for_each_entry(c, &cdev->configs, list) { 891 if (c == &c_target->c) 892 break; 893 } 894 if (c != &c_target->c) { 895 ret = -EINVAL; 896 goto out; 897 } 898 899 if (cdev->os_desc_config) { 900 ret = -EBUSY; 901 goto out; 902 } 903 904 cdev->os_desc_config = &c_target->c; 905 ret = 0; 906 907 out: 908 mutex_unlock(&gi->lock); 909 return ret; 910 } 911 912 static int os_desc_unlink(struct config_item *os_desc_ci, 913 struct config_item *usb_cfg_ci) 914 { 915 struct gadget_info *gi = container_of(to_config_group(os_desc_ci), 916 struct gadget_info, os_desc_group); 917 struct usb_composite_dev *cdev = &gi->cdev; 918 919 mutex_lock(&gi->lock); 920 if (gi->udc_name) 921 unregister_gadget(gi); 922 cdev->os_desc_config = NULL; 923 WARN_ON(gi->udc_name); 924 mutex_unlock(&gi->lock); 925 return 0; 926 } 927 928 static struct configfs_item_operations os_desc_ops = { 929 .release = os_desc_attr_release, 930 .show_attribute = os_desc_attr_show, 931 .store_attribute = os_desc_attr_store, 932 .allow_link = os_desc_link, 933 .drop_link = os_desc_unlink, 934 }; 935 936 static struct config_item_type os_desc_type = { 937 .ct_item_ops = &os_desc_ops, 938 .ct_attrs = os_desc_attrs, 939 .ct_owner = THIS_MODULE, 940 }; 941 942 CONFIGFS_ATTR_STRUCT(usb_os_desc); 943 CONFIGFS_ATTR_OPS(usb_os_desc); 944 945 946 static inline struct usb_os_desc_ext_prop 947 *to_usb_os_desc_ext_prop(struct config_item *item) 948 { 949 return container_of(item, struct usb_os_desc_ext_prop, item); 950 } 951 952 CONFIGFS_ATTR_STRUCT(usb_os_desc_ext_prop); 953 CONFIGFS_ATTR_OPS(usb_os_desc_ext_prop); 954 955 static ssize_t ext_prop_type_show(struct usb_os_desc_ext_prop *ext_prop, 956 char *page) 957 { 958 return sprintf(page, "%d", ext_prop->type); 959 } 960 961 static ssize_t ext_prop_type_store(struct usb_os_desc_ext_prop *ext_prop, 962 const char *page, size_t len) 963 { 964 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 965 u8 type; 966 int ret; 967 968 if (desc->opts_mutex) 969 mutex_lock(desc->opts_mutex); 970 ret = kstrtou8(page, 0, &type); 971 if (ret) 972 goto end; 973 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) { 974 ret = -EINVAL; 975 goto end; 976 } 977 978 if ((ext_prop->type == USB_EXT_PROP_BINARY || 979 ext_prop->type == USB_EXT_PROP_LE32 || 980 ext_prop->type == USB_EXT_PROP_BE32) && 981 (type == USB_EXT_PROP_UNICODE || 982 type == USB_EXT_PROP_UNICODE_ENV || 983 type == USB_EXT_PROP_UNICODE_LINK)) 984 ext_prop->data_len <<= 1; 985 else if ((ext_prop->type == USB_EXT_PROP_UNICODE || 986 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 987 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) && 988 (type == USB_EXT_PROP_BINARY || 989 type == USB_EXT_PROP_LE32 || 990 type == USB_EXT_PROP_BE32)) 991 ext_prop->data_len >>= 1; 992 ext_prop->type = type; 993 ret = len; 994 995 end: 996 if (desc->opts_mutex) 997 mutex_unlock(desc->opts_mutex); 998 return ret; 999 } 1000 1001 static ssize_t ext_prop_data_show(struct usb_os_desc_ext_prop *ext_prop, 1002 char *page) 1003 { 1004 int len = ext_prop->data_len; 1005 1006 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1007 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1008 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) 1009 len >>= 1; 1010 memcpy(page, ext_prop->data, len); 1011 1012 return len; 1013 } 1014 1015 static ssize_t ext_prop_data_store(struct usb_os_desc_ext_prop *ext_prop, 1016 const char *page, size_t len) 1017 { 1018 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent); 1019 char *new_data; 1020 size_t ret_len = len; 1021 1022 if (page[len - 1] == '\n' || page[len - 1] == '\0') 1023 --len; 1024 new_data = kmemdup(page, len, GFP_KERNEL); 1025 if (!new_data) 1026 return -ENOMEM; 1027 1028 if (desc->opts_mutex) 1029 mutex_lock(desc->opts_mutex); 1030 kfree(ext_prop->data); 1031 ext_prop->data = new_data; 1032 desc->ext_prop_len -= ext_prop->data_len; 1033 ext_prop->data_len = len; 1034 desc->ext_prop_len += ext_prop->data_len; 1035 if (ext_prop->type == USB_EXT_PROP_UNICODE || 1036 ext_prop->type == USB_EXT_PROP_UNICODE_ENV || 1037 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) { 1038 desc->ext_prop_len -= ext_prop->data_len; 1039 ext_prop->data_len <<= 1; 1040 ext_prop->data_len += 2; 1041 desc->ext_prop_len += ext_prop->data_len; 1042 } 1043 if (desc->opts_mutex) 1044 mutex_unlock(desc->opts_mutex); 1045 return ret_len; 1046 } 1047 1048 static struct usb_os_desc_ext_prop_attribute ext_prop_type = 1049 __CONFIGFS_ATTR(type, S_IRUGO | S_IWUSR, 1050 ext_prop_type_show, ext_prop_type_store); 1051 1052 static struct usb_os_desc_ext_prop_attribute ext_prop_data = 1053 __CONFIGFS_ATTR(data, S_IRUGO | S_IWUSR, 1054 ext_prop_data_show, ext_prop_data_store); 1055 1056 static struct configfs_attribute *ext_prop_attrs[] = { 1057 &ext_prop_type.attr, 1058 &ext_prop_data.attr, 1059 NULL, 1060 }; 1061 1062 static void usb_os_desc_ext_prop_release(struct config_item *item) 1063 { 1064 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1065 1066 kfree(ext_prop); /* frees a whole chunk */ 1067 } 1068 1069 static struct configfs_item_operations ext_prop_ops = { 1070 .release = usb_os_desc_ext_prop_release, 1071 .show_attribute = usb_os_desc_ext_prop_attr_show, 1072 .store_attribute = usb_os_desc_ext_prop_attr_store, 1073 }; 1074 1075 static struct config_item *ext_prop_make( 1076 struct config_group *group, 1077 const char *name) 1078 { 1079 struct usb_os_desc_ext_prop *ext_prop; 1080 struct config_item_type *ext_prop_type; 1081 struct usb_os_desc *desc; 1082 char *vlabuf; 1083 1084 vla_group(data_chunk); 1085 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1); 1086 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1); 1087 1088 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1089 if (!vlabuf) 1090 return ERR_PTR(-ENOMEM); 1091 1092 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop); 1093 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type); 1094 1095 desc = container_of(group, struct usb_os_desc, group); 1096 ext_prop_type->ct_item_ops = &ext_prop_ops; 1097 ext_prop_type->ct_attrs = ext_prop_attrs; 1098 ext_prop_type->ct_owner = desc->owner; 1099 1100 config_item_init_type_name(&ext_prop->item, name, ext_prop_type); 1101 1102 ext_prop->name = kstrdup(name, GFP_KERNEL); 1103 if (!ext_prop->name) { 1104 kfree(vlabuf); 1105 return ERR_PTR(-ENOMEM); 1106 } 1107 desc->ext_prop_len += 14; 1108 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2; 1109 if (desc->opts_mutex) 1110 mutex_lock(desc->opts_mutex); 1111 desc->ext_prop_len += ext_prop->name_len; 1112 list_add_tail(&ext_prop->entry, &desc->ext_prop); 1113 ++desc->ext_prop_count; 1114 if (desc->opts_mutex) 1115 mutex_unlock(desc->opts_mutex); 1116 1117 return &ext_prop->item; 1118 } 1119 1120 static void ext_prop_drop(struct config_group *group, struct config_item *item) 1121 { 1122 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item); 1123 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item); 1124 1125 if (desc->opts_mutex) 1126 mutex_lock(desc->opts_mutex); 1127 list_del(&ext_prop->entry); 1128 --desc->ext_prop_count; 1129 kfree(ext_prop->name); 1130 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14); 1131 if (desc->opts_mutex) 1132 mutex_unlock(desc->opts_mutex); 1133 config_item_put(item); 1134 } 1135 1136 static struct configfs_group_operations interf_grp_ops = { 1137 .make_item = &ext_prop_make, 1138 .drop_item = &ext_prop_drop, 1139 }; 1140 1141 static struct configfs_item_operations interf_item_ops = { 1142 .show_attribute = usb_os_desc_attr_show, 1143 .store_attribute = usb_os_desc_attr_store, 1144 }; 1145 1146 static ssize_t interf_grp_compatible_id_show(struct usb_os_desc *desc, 1147 char *page) 1148 { 1149 memcpy(page, desc->ext_compat_id, 8); 1150 return 8; 1151 } 1152 1153 static ssize_t interf_grp_compatible_id_store(struct usb_os_desc *desc, 1154 const char *page, size_t len) 1155 { 1156 int l; 1157 1158 l = min_t(int, 8, len); 1159 if (page[l - 1] == '\n') 1160 --l; 1161 if (desc->opts_mutex) 1162 mutex_lock(desc->opts_mutex); 1163 memcpy(desc->ext_compat_id, page, l); 1164 1165 if (desc->opts_mutex) 1166 mutex_unlock(desc->opts_mutex); 1167 1168 return len; 1169 } 1170 1171 static struct usb_os_desc_attribute interf_grp_attr_compatible_id = 1172 __CONFIGFS_ATTR(compatible_id, S_IRUGO | S_IWUSR, 1173 interf_grp_compatible_id_show, 1174 interf_grp_compatible_id_store); 1175 1176 static ssize_t interf_grp_sub_compatible_id_show(struct usb_os_desc *desc, 1177 char *page) 1178 { 1179 memcpy(page, desc->ext_compat_id + 8, 8); 1180 return 8; 1181 } 1182 1183 static ssize_t interf_grp_sub_compatible_id_store(struct usb_os_desc *desc, 1184 const char *page, size_t len) 1185 { 1186 int l; 1187 1188 l = min_t(int, 8, len); 1189 if (page[l - 1] == '\n') 1190 --l; 1191 if (desc->opts_mutex) 1192 mutex_lock(desc->opts_mutex); 1193 memcpy(desc->ext_compat_id + 8, page, l); 1194 1195 if (desc->opts_mutex) 1196 mutex_unlock(desc->opts_mutex); 1197 1198 return len; 1199 } 1200 1201 static struct usb_os_desc_attribute interf_grp_attr_sub_compatible_id = 1202 __CONFIGFS_ATTR(sub_compatible_id, S_IRUGO | S_IWUSR, 1203 interf_grp_sub_compatible_id_show, 1204 interf_grp_sub_compatible_id_store); 1205 1206 static struct configfs_attribute *interf_grp_attrs[] = { 1207 &interf_grp_attr_compatible_id.attr, 1208 &interf_grp_attr_sub_compatible_id.attr, 1209 NULL 1210 }; 1211 1212 int usb_os_desc_prepare_interf_dir(struct config_group *parent, 1213 int n_interf, 1214 struct usb_os_desc **desc, 1215 char **names, 1216 struct module *owner) 1217 { 1218 struct config_group **f_default_groups, *os_desc_group, 1219 **interface_groups; 1220 struct config_item_type *os_desc_type, *interface_type; 1221 1222 vla_group(data_chunk); 1223 vla_item(data_chunk, struct config_group *, f_default_groups, 2); 1224 vla_item(data_chunk, struct config_group, os_desc_group, 1); 1225 vla_item(data_chunk, struct config_group *, interface_groups, 1226 n_interf + 1); 1227 vla_item(data_chunk, struct config_item_type, os_desc_type, 1); 1228 vla_item(data_chunk, struct config_item_type, interface_type, 1); 1229 1230 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); 1231 if (!vlabuf) 1232 return -ENOMEM; 1233 1234 f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups); 1235 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); 1236 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); 1237 interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups); 1238 interface_type = vla_ptr(vlabuf, data_chunk, interface_type); 1239 1240 parent->default_groups = f_default_groups; 1241 os_desc_type->ct_owner = owner; 1242 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); 1243 f_default_groups[0] = os_desc_group; 1244 1245 os_desc_group->default_groups = interface_groups; 1246 interface_type->ct_item_ops = &interf_item_ops; 1247 interface_type->ct_group_ops = &interf_grp_ops; 1248 interface_type->ct_attrs = interf_grp_attrs; 1249 interface_type->ct_owner = owner; 1250 1251 while (n_interf--) { 1252 struct usb_os_desc *d; 1253 1254 d = desc[n_interf]; 1255 d->owner = owner; 1256 config_group_init_type_name(&d->group, "", interface_type); 1257 config_item_set_name(&d->group.cg_item, "interface.%s", 1258 names[n_interf]); 1259 interface_groups[n_interf] = &d->group; 1260 } 1261 1262 return 0; 1263 } 1264 EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); 1265 1266 static int configfs_do_nothing(struct usb_composite_dev *cdev) 1267 { 1268 WARN_ON(1); 1269 return -EINVAL; 1270 } 1271 1272 int composite_dev_prepare(struct usb_composite_driver *composite, 1273 struct usb_composite_dev *dev); 1274 1275 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1276 struct usb_ep *ep0); 1277 1278 static void purge_configs_funcs(struct gadget_info *gi) 1279 { 1280 struct usb_configuration *c; 1281 1282 list_for_each_entry(c, &gi->cdev.configs, list) { 1283 struct usb_function *f, *tmp; 1284 struct config_usb_cfg *cfg; 1285 1286 cfg = container_of(c, struct config_usb_cfg, c); 1287 1288 list_for_each_entry_safe(f, tmp, &c->functions, list) { 1289 1290 list_move_tail(&f->list, &cfg->func_list); 1291 if (f->unbind) { 1292 dev_err(&gi->cdev.gadget->dev, "unbind function" 1293 " '%s'/%p\n", f->name, f); 1294 f->unbind(c, f); 1295 } 1296 } 1297 c->next_interface_id = 0; 1298 memset(c->interface, 0, sizeof(c->interface)); 1299 c->superspeed = 0; 1300 c->highspeed = 0; 1301 c->fullspeed = 0; 1302 } 1303 } 1304 1305 static int configfs_composite_bind(struct usb_gadget *gadget, 1306 struct usb_gadget_driver *gdriver) 1307 { 1308 struct usb_composite_driver *composite = to_cdriver(gdriver); 1309 struct gadget_info *gi = container_of(composite, 1310 struct gadget_info, composite); 1311 struct usb_composite_dev *cdev = &gi->cdev; 1312 struct usb_configuration *c; 1313 struct usb_string *s; 1314 unsigned i; 1315 int ret; 1316 1317 /* the gi->lock is hold by the caller */ 1318 cdev->gadget = gadget; 1319 set_gadget_data(gadget, cdev); 1320 ret = composite_dev_prepare(composite, cdev); 1321 if (ret) 1322 return ret; 1323 /* and now the gadget bind */ 1324 ret = -EINVAL; 1325 1326 if (list_empty(&gi->cdev.configs)) { 1327 pr_err("Need at least one configuration in %s.\n", 1328 gi->composite.name); 1329 goto err_comp_cleanup; 1330 } 1331 1332 1333 list_for_each_entry(c, &gi->cdev.configs, list) { 1334 struct config_usb_cfg *cfg; 1335 1336 cfg = container_of(c, struct config_usb_cfg, c); 1337 if (list_empty(&cfg->func_list)) { 1338 pr_err("Config %s/%d of %s needs at least one function.\n", 1339 c->label, c->bConfigurationValue, 1340 gi->composite.name); 1341 goto err_comp_cleanup; 1342 } 1343 } 1344 1345 /* init all strings */ 1346 if (!list_empty(&gi->string_list)) { 1347 struct gadget_strings *gs; 1348 1349 i = 0; 1350 list_for_each_entry(gs, &gi->string_list, list) { 1351 1352 gi->gstrings[i] = &gs->stringtab_dev; 1353 gs->stringtab_dev.strings = gs->strings; 1354 gs->strings[USB_GADGET_MANUFACTURER_IDX].s = 1355 gs->manufacturer; 1356 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product; 1357 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber; 1358 i++; 1359 } 1360 gi->gstrings[i] = NULL; 1361 s = usb_gstrings_attach(&gi->cdev, gi->gstrings, 1362 USB_GADGET_FIRST_AVAIL_IDX); 1363 if (IS_ERR(s)) { 1364 ret = PTR_ERR(s); 1365 goto err_comp_cleanup; 1366 } 1367 1368 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; 1369 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; 1370 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; 1371 } 1372 1373 if (gi->use_os_desc) { 1374 cdev->use_os_string = true; 1375 cdev->b_vendor_code = gi->b_vendor_code; 1376 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); 1377 } 1378 1379 /* Go through all configs, attach all functions */ 1380 list_for_each_entry(c, &gi->cdev.configs, list) { 1381 struct config_usb_cfg *cfg; 1382 struct usb_function *f; 1383 struct usb_function *tmp; 1384 struct gadget_config_name *cn; 1385 1386 cfg = container_of(c, struct config_usb_cfg, c); 1387 if (!list_empty(&cfg->string_list)) { 1388 i = 0; 1389 list_for_each_entry(cn, &cfg->string_list, list) { 1390 cfg->gstrings[i] = &cn->stringtab_dev; 1391 cn->stringtab_dev.strings = &cn->strings; 1392 cn->strings.s = cn->configuration; 1393 i++; 1394 } 1395 cfg->gstrings[i] = NULL; 1396 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1); 1397 if (IS_ERR(s)) { 1398 ret = PTR_ERR(s); 1399 goto err_comp_cleanup; 1400 } 1401 c->iConfiguration = s[0].id; 1402 } 1403 1404 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) { 1405 list_del(&f->list); 1406 ret = usb_add_function(c, f); 1407 if (ret) { 1408 list_add(&f->list, &cfg->func_list); 1409 goto err_purge_funcs; 1410 } 1411 } 1412 usb_ep_autoconfig_reset(cdev->gadget); 1413 } 1414 if (cdev->use_os_string) { 1415 ret = composite_os_desc_req_prepare(cdev, gadget->ep0); 1416 if (ret) 1417 goto err_purge_funcs; 1418 } 1419 1420 usb_ep_autoconfig_reset(cdev->gadget); 1421 return 0; 1422 1423 err_purge_funcs: 1424 purge_configs_funcs(gi); 1425 err_comp_cleanup: 1426 composite_dev_cleanup(cdev); 1427 return ret; 1428 } 1429 1430 static void configfs_composite_unbind(struct usb_gadget *gadget) 1431 { 1432 struct usb_composite_dev *cdev; 1433 struct gadget_info *gi; 1434 1435 /* the gi->lock is hold by the caller */ 1436 1437 cdev = get_gadget_data(gadget); 1438 gi = container_of(cdev, struct gadget_info, cdev); 1439 1440 purge_configs_funcs(gi); 1441 composite_dev_cleanup(cdev); 1442 usb_ep_autoconfig_reset(cdev->gadget); 1443 cdev->gadget = NULL; 1444 set_gadget_data(gadget, NULL); 1445 } 1446 1447 static const struct usb_gadget_driver configfs_driver_template = { 1448 .bind = configfs_composite_bind, 1449 .unbind = configfs_composite_unbind, 1450 1451 .setup = composite_setup, 1452 .reset = composite_disconnect, 1453 .disconnect = composite_disconnect, 1454 1455 .suspend = composite_suspend, 1456 .resume = composite_resume, 1457 1458 .max_speed = USB_SPEED_SUPER, 1459 .driver = { 1460 .owner = THIS_MODULE, 1461 .name = "configfs-gadget", 1462 }, 1463 }; 1464 1465 static struct config_group *gadgets_make( 1466 struct config_group *group, 1467 const char *name) 1468 { 1469 struct gadget_info *gi; 1470 1471 gi = kzalloc(sizeof(*gi), GFP_KERNEL); 1472 if (!gi) 1473 return ERR_PTR(-ENOMEM); 1474 1475 gi->group.default_groups = gi->default_groups; 1476 gi->group.default_groups[0] = &gi->functions_group; 1477 gi->group.default_groups[1] = &gi->configs_group; 1478 gi->group.default_groups[2] = &gi->strings_group; 1479 gi->group.default_groups[3] = &gi->os_desc_group; 1480 1481 config_group_init_type_name(&gi->functions_group, "functions", 1482 &functions_type); 1483 config_group_init_type_name(&gi->configs_group, "configs", 1484 &config_desc_type); 1485 config_group_init_type_name(&gi->strings_group, "strings", 1486 &gadget_strings_strings_type); 1487 config_group_init_type_name(&gi->os_desc_group, "os_desc", 1488 &os_desc_type); 1489 1490 gi->composite.bind = configfs_do_nothing; 1491 gi->composite.unbind = configfs_do_nothing; 1492 gi->composite.suspend = NULL; 1493 gi->composite.resume = NULL; 1494 gi->composite.max_speed = USB_SPEED_SUPER; 1495 1496 mutex_init(&gi->lock); 1497 INIT_LIST_HEAD(&gi->string_list); 1498 INIT_LIST_HEAD(&gi->available_func); 1499 1500 composite_init_dev(&gi->cdev); 1501 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE; 1502 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE; 1503 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice()); 1504 1505 gi->composite.gadget_driver = configfs_driver_template; 1506 1507 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL); 1508 gi->composite.name = gi->composite.gadget_driver.function; 1509 1510 if (!gi->composite.gadget_driver.function) 1511 goto err; 1512 1513 #ifdef CONFIG_USB_OTG 1514 gi->otg.bLength = sizeof(struct usb_otg_descriptor); 1515 gi->otg.bDescriptorType = USB_DT_OTG; 1516 gi->otg.bmAttributes = USB_OTG_SRP | USB_OTG_HNP; 1517 #endif 1518 1519 config_group_init_type_name(&gi->group, name, 1520 &gadget_root_type); 1521 return &gi->group; 1522 err: 1523 kfree(gi); 1524 return ERR_PTR(-ENOMEM); 1525 } 1526 1527 static void gadgets_drop(struct config_group *group, struct config_item *item) 1528 { 1529 config_item_put(item); 1530 } 1531 1532 static struct configfs_group_operations gadgets_ops = { 1533 .make_group = &gadgets_make, 1534 .drop_item = &gadgets_drop, 1535 }; 1536 1537 static struct config_item_type gadgets_type = { 1538 .ct_group_ops = &gadgets_ops, 1539 .ct_owner = THIS_MODULE, 1540 }; 1541 1542 static struct configfs_subsystem gadget_subsys = { 1543 .su_group = { 1544 .cg_item = { 1545 .ci_namebuf = "usb_gadget", 1546 .ci_type = &gadgets_type, 1547 }, 1548 }, 1549 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex), 1550 }; 1551 1552 void unregister_gadget_item(struct config_item *item) 1553 { 1554 struct gadget_info *gi = to_gadget_info(item); 1555 1556 unregister_gadget(gi); 1557 } 1558 EXPORT_SYMBOL_GPL(unregister_gadget_item); 1559 1560 static int __init gadget_cfs_init(void) 1561 { 1562 int ret; 1563 1564 config_group_init(&gadget_subsys.su_group); 1565 1566 ret = configfs_register_subsystem(&gadget_subsys); 1567 return ret; 1568 } 1569 module_init(gadget_cfs_init); 1570 1571 static void __exit gadget_cfs_exit(void) 1572 { 1573 configfs_unregister_subsystem(&gadget_subsys); 1574 } 1575 module_exit(gadget_cfs_exit); 1576