1 /* 2 * f_dfu.c -- Device Firmware Update USB function 3 * 4 * Copyright (C) 2012 Samsung Electronics 5 * authors: Andrzej Pietrasiewicz <andrzej.p@samsung.com> 6 * Lukasz Majewski <l.majewski@samsung.com> 7 * 8 * Based on OpenMoko u-boot: drivers/usb/usbdfu.c 9 * (C) 2007 by OpenMoko, Inc. 10 * Author: Harald Welte <laforge@openmoko.org> 11 * 12 * based on existing SAM7DFU code from OpenPCD: 13 * (C) Copyright 2006 by Harald Welte <hwelte at hmw-consulting.de> 14 * 15 * SPDX-License-Identifier: GPL-2.0+ 16 */ 17 18 #include <errno.h> 19 #include <common.h> 20 #include <malloc.h> 21 22 #include <linux/usb/ch9.h> 23 #include <linux/usb/gadget.h> 24 #include <linux/usb/composite.h> 25 26 #include <dfu.h> 27 #include "f_dfu.h" 28 29 struct f_dfu { 30 struct usb_function usb_function; 31 32 struct usb_descriptor_header **function; 33 struct usb_string *strings; 34 35 /* when configured, we have one config */ 36 u8 config; 37 u8 altsetting; 38 enum dfu_state dfu_state; 39 unsigned int dfu_status; 40 41 /* Send/received block number is handy for data integrity check */ 42 int blk_seq_num; 43 }; 44 45 typedef int (*dfu_state_fn) (struct f_dfu *, 46 const struct usb_ctrlrequest *, 47 struct usb_gadget *, 48 struct usb_request *); 49 50 static inline struct f_dfu *func_to_dfu(struct usb_function *f) 51 { 52 return container_of(f, struct f_dfu, usb_function); 53 } 54 55 static const struct dfu_function_descriptor dfu_func = { 56 .bLength = sizeof dfu_func, 57 .bDescriptorType = DFU_DT_FUNC, 58 .bmAttributes = DFU_BIT_WILL_DETACH | 59 DFU_BIT_MANIFESTATION_TOLERANT | 60 DFU_BIT_CAN_UPLOAD | 61 DFU_BIT_CAN_DNLOAD, 62 .wDetachTimeOut = 0, 63 .wTransferSize = DFU_USB_BUFSIZ, 64 .bcdDFUVersion = __constant_cpu_to_le16(0x0110), 65 }; 66 67 static struct usb_interface_descriptor dfu_intf_runtime = { 68 .bLength = sizeof dfu_intf_runtime, 69 .bDescriptorType = USB_DT_INTERFACE, 70 .bNumEndpoints = 0, 71 .bInterfaceClass = USB_CLASS_APP_SPEC, 72 .bInterfaceSubClass = 1, 73 .bInterfaceProtocol = 1, 74 /* .iInterface = DYNAMIC */ 75 }; 76 77 static struct usb_descriptor_header *dfu_runtime_descs[] = { 78 (struct usb_descriptor_header *) &dfu_intf_runtime, 79 NULL, 80 }; 81 82 static const struct usb_qualifier_descriptor dev_qualifier = { 83 .bLength = sizeof dev_qualifier, 84 .bDescriptorType = USB_DT_DEVICE_QUALIFIER, 85 .bcdUSB = __constant_cpu_to_le16(0x0200), 86 .bDeviceClass = USB_CLASS_VENDOR_SPEC, 87 .bNumConfigurations = 1, 88 }; 89 90 static const char dfu_name[] = "Device Firmware Upgrade"; 91 92 /* 93 * static strings, in UTF-8 94 * 95 * dfu_generic configuration 96 */ 97 static struct usb_string strings_dfu_generic[] = { 98 [0].s = dfu_name, 99 { } /* end of list */ 100 }; 101 102 static struct usb_gadget_strings stringtab_dfu_generic = { 103 .language = 0x0409, /* en-us */ 104 .strings = strings_dfu_generic, 105 }; 106 107 static struct usb_gadget_strings *dfu_generic_strings[] = { 108 &stringtab_dfu_generic, 109 NULL, 110 }; 111 112 /* 113 * usb_function specific 114 */ 115 static struct usb_gadget_strings stringtab_dfu = { 116 .language = 0x0409, /* en-us */ 117 /* 118 * .strings 119 * 120 * assigned during initialization, 121 * depends on number of flash entities 122 * 123 */ 124 }; 125 126 static struct usb_gadget_strings *dfu_strings[] = { 127 &stringtab_dfu, 128 NULL, 129 }; 130 131 /*-------------------------------------------------------------------------*/ 132 133 static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req) 134 { 135 struct f_dfu *f_dfu = req->context; 136 137 dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf, 138 req->length, f_dfu->blk_seq_num); 139 140 if (req->length == 0) 141 puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n"); 142 } 143 144 static void handle_getstatus(struct usb_request *req) 145 { 146 struct dfu_status *dstat = (struct dfu_status *)req->buf; 147 struct f_dfu *f_dfu = req->context; 148 149 switch (f_dfu->dfu_state) { 150 case DFU_STATE_dfuDNLOAD_SYNC: 151 case DFU_STATE_dfuDNBUSY: 152 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE; 153 break; 154 case DFU_STATE_dfuMANIFEST_SYNC: 155 break; 156 default: 157 break; 158 } 159 160 /* send status response */ 161 dstat->bStatus = f_dfu->dfu_status; 162 dstat->bwPollTimeout[0] = 0; 163 dstat->bwPollTimeout[1] = 0; 164 dstat->bwPollTimeout[2] = 0; 165 dstat->bState = f_dfu->dfu_state; 166 dstat->iString = 0; 167 } 168 169 static void handle_getstate(struct usb_request *req) 170 { 171 struct f_dfu *f_dfu = req->context; 172 173 ((u8 *)req->buf)[0] = f_dfu->dfu_state; 174 req->actual = sizeof(u8); 175 } 176 177 static inline void to_dfu_mode(struct f_dfu *f_dfu) 178 { 179 f_dfu->usb_function.strings = dfu_strings; 180 f_dfu->usb_function.hs_descriptors = f_dfu->function; 181 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 182 } 183 184 static inline void to_runtime_mode(struct f_dfu *f_dfu) 185 { 186 f_dfu->usb_function.strings = NULL; 187 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 188 } 189 190 static int handle_upload(struct usb_request *req, u16 len) 191 { 192 struct f_dfu *f_dfu = req->context; 193 194 return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf, 195 req->length, f_dfu->blk_seq_num); 196 } 197 198 static int handle_dnload(struct usb_gadget *gadget, u16 len) 199 { 200 struct usb_composite_dev *cdev = get_gadget_data(gadget); 201 struct usb_request *req = cdev->req; 202 struct f_dfu *f_dfu = req->context; 203 204 if (len == 0) 205 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC; 206 207 req->complete = dnload_request_complete; 208 209 return len; 210 } 211 212 /*-------------------------------------------------------------------------*/ 213 /* DFU state machine */ 214 static int state_app_idle(struct f_dfu *f_dfu, 215 const struct usb_ctrlrequest *ctrl, 216 struct usb_gadget *gadget, 217 struct usb_request *req) 218 { 219 int value = 0; 220 221 switch (ctrl->bRequest) { 222 case USB_REQ_DFU_GETSTATUS: 223 handle_getstatus(req); 224 value = RET_STAT_LEN; 225 break; 226 case USB_REQ_DFU_GETSTATE: 227 handle_getstate(req); 228 break; 229 case USB_REQ_DFU_DETACH: 230 f_dfu->dfu_state = DFU_STATE_appDETACH; 231 to_dfu_mode(f_dfu); 232 value = RET_ZLP; 233 break; 234 default: 235 value = RET_STALL; 236 break; 237 } 238 239 return value; 240 } 241 242 static int state_app_detach(struct f_dfu *f_dfu, 243 const struct usb_ctrlrequest *ctrl, 244 struct usb_gadget *gadget, 245 struct usb_request *req) 246 { 247 int value = 0; 248 249 switch (ctrl->bRequest) { 250 case USB_REQ_DFU_GETSTATUS: 251 handle_getstatus(req); 252 value = RET_STAT_LEN; 253 break; 254 case USB_REQ_DFU_GETSTATE: 255 handle_getstate(req); 256 break; 257 default: 258 f_dfu->dfu_state = DFU_STATE_appIDLE; 259 value = RET_STALL; 260 break; 261 } 262 263 return value; 264 } 265 266 static int state_dfu_idle(struct f_dfu *f_dfu, 267 const struct usb_ctrlrequest *ctrl, 268 struct usb_gadget *gadget, 269 struct usb_request *req) 270 { 271 u16 w_value = le16_to_cpu(ctrl->wValue); 272 u16 len = le16_to_cpu(ctrl->wLength); 273 int value = 0; 274 275 switch (ctrl->bRequest) { 276 case USB_REQ_DFU_DNLOAD: 277 if (len == 0) { 278 f_dfu->dfu_state = DFU_STATE_dfuERROR; 279 value = RET_STALL; 280 break; 281 } 282 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 283 f_dfu->blk_seq_num = w_value; 284 value = handle_dnload(gadget, len); 285 break; 286 case USB_REQ_DFU_UPLOAD: 287 f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE; 288 f_dfu->blk_seq_num = 0; 289 value = handle_upload(req, len); 290 break; 291 case USB_REQ_DFU_ABORT: 292 /* no zlp? */ 293 value = RET_ZLP; 294 break; 295 case USB_REQ_DFU_GETSTATUS: 296 handle_getstatus(req); 297 value = RET_STAT_LEN; 298 break; 299 case USB_REQ_DFU_GETSTATE: 300 handle_getstate(req); 301 break; 302 case USB_REQ_DFU_DETACH: 303 /* 304 * Proprietary extension: 'detach' from idle mode and 305 * get back to runtime mode in case of USB Reset. As 306 * much as I dislike this, we just can't use every USB 307 * bus reset to switch back to runtime mode, since at 308 * least the Linux USB stack likes to send a number of 309 * resets in a row :( 310 */ 311 f_dfu->dfu_state = 312 DFU_STATE_dfuMANIFEST_WAIT_RST; 313 to_runtime_mode(f_dfu); 314 f_dfu->dfu_state = DFU_STATE_appIDLE; 315 316 dfu_trigger_reset(); 317 break; 318 default: 319 f_dfu->dfu_state = DFU_STATE_dfuERROR; 320 value = RET_STALL; 321 break; 322 } 323 324 return value; 325 } 326 327 static int state_dfu_dnload_sync(struct f_dfu *f_dfu, 328 const struct usb_ctrlrequest *ctrl, 329 struct usb_gadget *gadget, 330 struct usb_request *req) 331 { 332 int value = 0; 333 334 switch (ctrl->bRequest) { 335 case USB_REQ_DFU_GETSTATUS: 336 handle_getstatus(req); 337 value = RET_STAT_LEN; 338 break; 339 case USB_REQ_DFU_GETSTATE: 340 handle_getstate(req); 341 break; 342 default: 343 f_dfu->dfu_state = DFU_STATE_dfuERROR; 344 value = RET_STALL; 345 break; 346 } 347 348 return value; 349 } 350 351 static int state_dfu_dnbusy(struct f_dfu *f_dfu, 352 const struct usb_ctrlrequest *ctrl, 353 struct usb_gadget *gadget, 354 struct usb_request *req) 355 { 356 int value = 0; 357 358 switch (ctrl->bRequest) { 359 case USB_REQ_DFU_GETSTATUS: 360 handle_getstatus(req); 361 value = RET_STAT_LEN; 362 break; 363 default: 364 f_dfu->dfu_state = DFU_STATE_dfuERROR; 365 value = RET_STALL; 366 break; 367 } 368 369 return value; 370 } 371 372 static int state_dfu_dnload_idle(struct f_dfu *f_dfu, 373 const struct usb_ctrlrequest *ctrl, 374 struct usb_gadget *gadget, 375 struct usb_request *req) 376 { 377 u16 w_value = le16_to_cpu(ctrl->wValue); 378 u16 len = le16_to_cpu(ctrl->wLength); 379 int value = 0; 380 381 switch (ctrl->bRequest) { 382 case USB_REQ_DFU_DNLOAD: 383 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 384 f_dfu->blk_seq_num = w_value; 385 value = handle_dnload(gadget, len); 386 break; 387 case USB_REQ_DFU_ABORT: 388 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 389 value = RET_ZLP; 390 break; 391 case USB_REQ_DFU_GETSTATUS: 392 handle_getstatus(req); 393 value = RET_STAT_LEN; 394 break; 395 case USB_REQ_DFU_GETSTATE: 396 handle_getstate(req); 397 break; 398 default: 399 f_dfu->dfu_state = DFU_STATE_dfuERROR; 400 value = RET_STALL; 401 break; 402 } 403 404 return value; 405 } 406 407 static int state_dfu_manifest_sync(struct f_dfu *f_dfu, 408 const struct usb_ctrlrequest *ctrl, 409 struct usb_gadget *gadget, 410 struct usb_request *req) 411 { 412 int value = 0; 413 414 switch (ctrl->bRequest) { 415 case USB_REQ_DFU_GETSTATUS: 416 /* We're MainfestationTolerant */ 417 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 418 handle_getstatus(req); 419 f_dfu->blk_seq_num = 0; 420 value = RET_STAT_LEN; 421 break; 422 case USB_REQ_DFU_GETSTATE: 423 handle_getstate(req); 424 break; 425 default: 426 f_dfu->dfu_state = DFU_STATE_dfuERROR; 427 value = RET_STALL; 428 break; 429 } 430 431 return value; 432 } 433 434 static int state_dfu_upload_idle(struct f_dfu *f_dfu, 435 const struct usb_ctrlrequest *ctrl, 436 struct usb_gadget *gadget, 437 struct usb_request *req) 438 { 439 u16 w_value = le16_to_cpu(ctrl->wValue); 440 u16 len = le16_to_cpu(ctrl->wLength); 441 int value = 0; 442 443 switch (ctrl->bRequest) { 444 case USB_REQ_DFU_UPLOAD: 445 /* state transition if less data then requested */ 446 f_dfu->blk_seq_num = w_value; 447 value = handle_upload(req, len); 448 if (value >= 0 && value < len) 449 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 450 break; 451 case USB_REQ_DFU_ABORT: 452 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 453 /* no zlp? */ 454 value = RET_ZLP; 455 break; 456 case USB_REQ_DFU_GETSTATUS: 457 handle_getstatus(req); 458 value = RET_STAT_LEN; 459 break; 460 case USB_REQ_DFU_GETSTATE: 461 handle_getstate(req); 462 break; 463 default: 464 f_dfu->dfu_state = DFU_STATE_dfuERROR; 465 value = RET_STALL; 466 break; 467 } 468 469 return value; 470 } 471 472 static int state_dfu_error(struct f_dfu *f_dfu, 473 const struct usb_ctrlrequest *ctrl, 474 struct usb_gadget *gadget, 475 struct usb_request *req) 476 { 477 int value = 0; 478 479 switch (ctrl->bRequest) { 480 case USB_REQ_DFU_GETSTATUS: 481 handle_getstatus(req); 482 value = RET_STAT_LEN; 483 break; 484 case USB_REQ_DFU_GETSTATE: 485 handle_getstate(req); 486 break; 487 case USB_REQ_DFU_CLRSTATUS: 488 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 489 f_dfu->dfu_status = DFU_STATUS_OK; 490 /* no zlp? */ 491 value = RET_ZLP; 492 break; 493 default: 494 f_dfu->dfu_state = DFU_STATE_dfuERROR; 495 value = RET_STALL; 496 break; 497 } 498 499 return value; 500 } 501 502 static dfu_state_fn dfu_state[] = { 503 state_app_idle, /* DFU_STATE_appIDLE */ 504 state_app_detach, /* DFU_STATE_appDETACH */ 505 state_dfu_idle, /* DFU_STATE_dfuIDLE */ 506 state_dfu_dnload_sync, /* DFU_STATE_dfuDNLOAD_SYNC */ 507 state_dfu_dnbusy, /* DFU_STATE_dfuDNBUSY */ 508 state_dfu_dnload_idle, /* DFU_STATE_dfuDNLOAD_IDLE */ 509 state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */ 510 NULL, /* DFU_STATE_dfuMANIFEST */ 511 NULL, /* DFU_STATE_dfuMANIFEST_WAIT_RST */ 512 state_dfu_upload_idle, /* DFU_STATE_dfuUPLOAD_IDLE */ 513 state_dfu_error /* DFU_STATE_dfuERROR */ 514 }; 515 516 static int 517 dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 518 { 519 struct usb_gadget *gadget = f->config->cdev->gadget; 520 struct usb_request *req = f->config->cdev->req; 521 struct f_dfu *f_dfu = f->config->cdev->req->context; 522 u16 len = le16_to_cpu(ctrl->wLength); 523 u16 w_value = le16_to_cpu(ctrl->wValue); 524 int value = 0; 525 u8 req_type = ctrl->bRequestType & USB_TYPE_MASK; 526 527 debug("w_value: 0x%x len: 0x%x\n", w_value, len); 528 debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n", 529 req_type, ctrl->bRequest, f_dfu->dfu_state); 530 531 if (req_type == USB_TYPE_STANDARD) { 532 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR && 533 (w_value >> 8) == DFU_DT_FUNC) { 534 value = min(len, (u16) sizeof(dfu_func)); 535 memcpy(req->buf, &dfu_func, value); 536 } 537 } else /* DFU specific request */ 538 value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req); 539 540 if (value >= 0) { 541 req->length = value; 542 req->zero = value < len; 543 value = usb_ep_queue(gadget->ep0, req, 0); 544 if (value < 0) { 545 debug("ep_queue --> %d\n", value); 546 req->status = 0; 547 } 548 } 549 550 return value; 551 } 552 553 /*-------------------------------------------------------------------------*/ 554 555 static int 556 dfu_prepare_strings(struct f_dfu *f_dfu, int n) 557 { 558 struct dfu_entity *de = NULL; 559 int i = 0; 560 561 f_dfu->strings = calloc(sizeof(struct usb_string), n + 1); 562 if (!f_dfu->strings) 563 goto enomem; 564 565 for (i = 0; i < n; ++i) { 566 de = dfu_get_entity(i); 567 f_dfu->strings[i].s = de->name; 568 } 569 570 f_dfu->strings[i].id = 0; 571 f_dfu->strings[i].s = NULL; 572 573 return 0; 574 575 enomem: 576 while (i) 577 f_dfu->strings[--i].s = NULL; 578 579 free(f_dfu->strings); 580 581 return -ENOMEM; 582 } 583 584 static int dfu_prepare_function(struct f_dfu *f_dfu, int n) 585 { 586 struct usb_interface_descriptor *d; 587 int i = 0; 588 589 f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n + 1); 590 if (!f_dfu->function) 591 goto enomem; 592 593 for (i = 0; i < n; ++i) { 594 d = calloc(sizeof(*d), 1); 595 if (!d) 596 goto enomem; 597 598 d->bLength = sizeof(*d); 599 d->bDescriptorType = USB_DT_INTERFACE; 600 d->bAlternateSetting = i; 601 d->bNumEndpoints = 0; 602 d->bInterfaceClass = USB_CLASS_APP_SPEC; 603 d->bInterfaceSubClass = 1; 604 d->bInterfaceProtocol = 2; 605 606 f_dfu->function[i] = (struct usb_descriptor_header *)d; 607 } 608 f_dfu->function[i] = NULL; 609 610 return 0; 611 612 enomem: 613 while (i) { 614 free(f_dfu->function[--i]); 615 f_dfu->function[i] = NULL; 616 } 617 free(f_dfu->function); 618 619 return -ENOMEM; 620 } 621 622 static int dfu_bind(struct usb_configuration *c, struct usb_function *f) 623 { 624 struct usb_composite_dev *cdev = c->cdev; 625 struct f_dfu *f_dfu = func_to_dfu(f); 626 int alt_num = dfu_get_alt_number(); 627 int rv, id, i; 628 629 id = usb_interface_id(c, f); 630 if (id < 0) 631 return id; 632 dfu_intf_runtime.bInterfaceNumber = id; 633 634 f_dfu->dfu_state = DFU_STATE_appIDLE; 635 f_dfu->dfu_status = DFU_STATUS_OK; 636 637 rv = dfu_prepare_function(f_dfu, alt_num); 638 if (rv) 639 goto error; 640 641 rv = dfu_prepare_strings(f_dfu, alt_num); 642 if (rv) 643 goto error; 644 for (i = 0; i < alt_num; i++) { 645 id = usb_string_id(cdev); 646 if (id < 0) 647 return id; 648 f_dfu->strings[i].id = id; 649 ((struct usb_interface_descriptor *)f_dfu->function[i]) 650 ->iInterface = id; 651 } 652 653 to_dfu_mode(f_dfu); 654 655 stringtab_dfu.strings = f_dfu->strings; 656 657 cdev->req->context = f_dfu; 658 659 error: 660 return rv; 661 } 662 663 static void dfu_unbind(struct usb_configuration *c, struct usb_function *f) 664 { 665 struct f_dfu *f_dfu = func_to_dfu(f); 666 int alt_num = dfu_get_alt_number(); 667 int i; 668 669 if (f_dfu->strings) { 670 i = alt_num; 671 while (i) 672 f_dfu->strings[--i].s = NULL; 673 674 free(f_dfu->strings); 675 } 676 677 if (f_dfu->function) { 678 i = alt_num; 679 while (i) { 680 free(f_dfu->function[--i]); 681 f_dfu->function[i] = NULL; 682 } 683 free(f_dfu->function); 684 } 685 686 free(f_dfu); 687 } 688 689 static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 690 { 691 struct f_dfu *f_dfu = func_to_dfu(f); 692 693 debug("%s: intf:%d alt:%d\n", __func__, intf, alt); 694 695 f_dfu->altsetting = alt; 696 697 return 0; 698 } 699 700 /* TODO: is this really what we need here? */ 701 static void dfu_disable(struct usb_function *f) 702 { 703 struct f_dfu *f_dfu = func_to_dfu(f); 704 if (f_dfu->config == 0) 705 return; 706 707 debug("%s: reset config\n", __func__); 708 709 f_dfu->config = 0; 710 } 711 712 static int dfu_bind_config(struct usb_configuration *c) 713 { 714 struct f_dfu *f_dfu; 715 int status; 716 717 f_dfu = calloc(sizeof(*f_dfu), 1); 718 if (!f_dfu) 719 return -ENOMEM; 720 f_dfu->usb_function.name = "dfu"; 721 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 722 f_dfu->usb_function.bind = dfu_bind; 723 f_dfu->usb_function.unbind = dfu_unbind; 724 f_dfu->usb_function.set_alt = dfu_set_alt; 725 f_dfu->usb_function.disable = dfu_disable; 726 f_dfu->usb_function.strings = dfu_generic_strings, 727 f_dfu->usb_function.setup = dfu_handle, 728 729 status = usb_add_function(c, &f_dfu->usb_function); 730 if (status) 731 free(f_dfu); 732 733 return status; 734 } 735 736 int dfu_add(struct usb_configuration *c) 737 { 738 int id; 739 740 id = usb_string_id(c->cdev); 741 if (id < 0) 742 return id; 743 strings_dfu_generic[0].id = id; 744 dfu_intf_runtime.iInterface = id; 745 746 debug("%s: cdev: 0x%p gadget:0x%p gadget->ep0: 0x%p\n", __func__, 747 c->cdev, c->cdev->gadget, c->cdev->gadget->ep0); 748 749 return dfu_bind_config(c); 750 } 751