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 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <errno.h> 24 #include <common.h> 25 #include <malloc.h> 26 27 #include <linux/usb/ch9.h> 28 #include <usbdescriptors.h> 29 #include <linux/usb/gadget.h> 30 #include <linux/usb/composite.h> 31 32 #include <dfu.h> 33 #include "f_dfu.h" 34 35 struct f_dfu { 36 struct usb_function usb_function; 37 38 struct usb_descriptor_header **function; 39 struct usb_string *strings; 40 41 /* when configured, we have one config */ 42 u8 config; 43 u8 altsetting; 44 enum dfu_state dfu_state; 45 unsigned int dfu_status; 46 47 /* Send/received block number is handy for data integrity check */ 48 int blk_seq_num; 49 }; 50 51 typedef int (*dfu_state_fn) (struct f_dfu *, 52 const struct usb_ctrlrequest *, 53 struct usb_gadget *, 54 struct usb_request *); 55 56 static inline struct f_dfu *func_to_dfu(struct usb_function *f) 57 { 58 return container_of(f, struct f_dfu, usb_function); 59 } 60 61 static const struct dfu_function_descriptor dfu_func = { 62 .bLength = sizeof dfu_func, 63 .bDescriptorType = DFU_DT_FUNC, 64 .bmAttributes = DFU_BIT_WILL_DETACH | 65 DFU_BIT_MANIFESTATION_TOLERANT | 66 DFU_BIT_CAN_UPLOAD | 67 DFU_BIT_CAN_DNLOAD, 68 .wDetachTimeOut = 0, 69 .wTransferSize = DFU_USB_BUFSIZ, 70 .bcdDFUVersion = __constant_cpu_to_le16(0x0110), 71 }; 72 73 static struct usb_interface_descriptor dfu_intf_runtime = { 74 .bLength = sizeof dfu_intf_runtime, 75 .bDescriptorType = USB_DT_INTERFACE, 76 .bNumEndpoints = 0, 77 .bInterfaceClass = USB_CLASS_APP_SPEC, 78 .bInterfaceSubClass = 1, 79 .bInterfaceProtocol = 1, 80 /* .iInterface = DYNAMIC */ 81 }; 82 83 static struct usb_descriptor_header *dfu_runtime_descs[] = { 84 (struct usb_descriptor_header *) &dfu_intf_runtime, 85 NULL, 86 }; 87 88 static const struct usb_qualifier_descriptor dev_qualifier = { 89 .bLength = sizeof dev_qualifier, 90 .bDescriptorType = USB_DT_DEVICE_QUALIFIER, 91 .bcdUSB = __constant_cpu_to_le16(0x0200), 92 .bDeviceClass = USB_CLASS_VENDOR_SPEC, 93 .bNumConfigurations = 1, 94 }; 95 96 static const char dfu_name[] = "Device Firmware Upgrade"; 97 98 /* 99 * static strings, in UTF-8 100 * 101 * dfu_generic configuration 102 */ 103 static struct usb_string strings_dfu_generic[] = { 104 [0].s = dfu_name, 105 { } /* end of list */ 106 }; 107 108 static struct usb_gadget_strings stringtab_dfu_generic = { 109 .language = 0x0409, /* en-us */ 110 .strings = strings_dfu_generic, 111 }; 112 113 static struct usb_gadget_strings *dfu_generic_strings[] = { 114 &stringtab_dfu_generic, 115 NULL, 116 }; 117 118 /* 119 * usb_function specific 120 */ 121 static struct usb_gadget_strings stringtab_dfu = { 122 .language = 0x0409, /* en-us */ 123 /* 124 * .strings 125 * 126 * assigned during initialization, 127 * depends on number of flash entities 128 * 129 */ 130 }; 131 132 static struct usb_gadget_strings *dfu_strings[] = { 133 &stringtab_dfu, 134 NULL, 135 }; 136 137 /*-------------------------------------------------------------------------*/ 138 139 static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req) 140 { 141 struct f_dfu *f_dfu = req->context; 142 143 dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf, 144 req->length, f_dfu->blk_seq_num); 145 146 if (req->length == 0) 147 puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n"); 148 } 149 150 static void handle_getstatus(struct usb_request *req) 151 { 152 struct dfu_status *dstat = (struct dfu_status *)req->buf; 153 struct f_dfu *f_dfu = req->context; 154 155 switch (f_dfu->dfu_state) { 156 case DFU_STATE_dfuDNLOAD_SYNC: 157 case DFU_STATE_dfuDNBUSY: 158 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE; 159 break; 160 case DFU_STATE_dfuMANIFEST_SYNC: 161 break; 162 default: 163 break; 164 } 165 166 /* send status response */ 167 dstat->bStatus = f_dfu->dfu_status; 168 dstat->bState = f_dfu->dfu_state; 169 dstat->iString = 0; 170 } 171 172 static void handle_getstate(struct usb_request *req) 173 { 174 struct f_dfu *f_dfu = req->context; 175 176 ((u8 *)req->buf)[0] = f_dfu->dfu_state; 177 req->actual = sizeof(u8); 178 } 179 180 static inline void to_dfu_mode(struct f_dfu *f_dfu) 181 { 182 f_dfu->usb_function.strings = dfu_strings; 183 f_dfu->usb_function.hs_descriptors = f_dfu->function; 184 } 185 186 static inline void to_runtime_mode(struct f_dfu *f_dfu) 187 { 188 f_dfu->usb_function.strings = NULL; 189 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 190 } 191 192 static int handle_upload(struct usb_request *req, u16 len) 193 { 194 struct f_dfu *f_dfu = req->context; 195 196 return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf, 197 req->length, f_dfu->blk_seq_num); 198 } 199 200 static int handle_dnload(struct usb_gadget *gadget, u16 len) 201 { 202 struct usb_composite_dev *cdev = get_gadget_data(gadget); 203 struct usb_request *req = cdev->req; 204 struct f_dfu *f_dfu = req->context; 205 206 if (len == 0) 207 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC; 208 209 req->complete = dnload_request_complete; 210 211 return len; 212 } 213 214 /*-------------------------------------------------------------------------*/ 215 /* DFU state machine */ 216 static int state_app_idle(struct f_dfu *f_dfu, 217 const struct usb_ctrlrequest *ctrl, 218 struct usb_gadget *gadget, 219 struct usb_request *req) 220 { 221 int value = 0; 222 223 switch (ctrl->bRequest) { 224 case USB_REQ_DFU_GETSTATUS: 225 handle_getstatus(req); 226 value = RET_STAT_LEN; 227 break; 228 case USB_REQ_DFU_GETSTATE: 229 handle_getstate(req); 230 break; 231 case USB_REQ_DFU_DETACH: 232 f_dfu->dfu_state = DFU_STATE_appDETACH; 233 to_dfu_mode(f_dfu); 234 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 235 value = RET_ZLP; 236 break; 237 default: 238 value = RET_STALL; 239 break; 240 } 241 242 return value; 243 } 244 245 static int state_app_detach(struct f_dfu *f_dfu, 246 const struct usb_ctrlrequest *ctrl, 247 struct usb_gadget *gadget, 248 struct usb_request *req) 249 { 250 int value = 0; 251 252 switch (ctrl->bRequest) { 253 case USB_REQ_DFU_GETSTATUS: 254 handle_getstatus(req); 255 value = RET_STAT_LEN; 256 break; 257 case USB_REQ_DFU_GETSTATE: 258 handle_getstate(req); 259 break; 260 default: 261 f_dfu->dfu_state = DFU_STATE_appIDLE; 262 value = RET_STALL; 263 break; 264 } 265 266 return value; 267 } 268 269 static int state_dfu_idle(struct f_dfu *f_dfu, 270 const struct usb_ctrlrequest *ctrl, 271 struct usb_gadget *gadget, 272 struct usb_request *req) 273 { 274 u16 w_value = le16_to_cpu(ctrl->wValue); 275 u16 len = le16_to_cpu(ctrl->wLength); 276 int value = 0; 277 278 switch (ctrl->bRequest) { 279 case USB_REQ_DFU_DNLOAD: 280 if (len == 0) { 281 f_dfu->dfu_state = DFU_STATE_dfuERROR; 282 value = RET_STALL; 283 break; 284 } 285 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 286 f_dfu->blk_seq_num = w_value; 287 value = handle_dnload(gadget, len); 288 break; 289 case USB_REQ_DFU_UPLOAD: 290 f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE; 291 f_dfu->blk_seq_num = 0; 292 value = handle_upload(req, len); 293 break; 294 case USB_REQ_DFU_ABORT: 295 /* no zlp? */ 296 value = RET_ZLP; 297 break; 298 case USB_REQ_DFU_GETSTATUS: 299 handle_getstatus(req); 300 value = RET_STAT_LEN; 301 break; 302 case USB_REQ_DFU_GETSTATE: 303 handle_getstate(req); 304 break; 305 case USB_REQ_DFU_DETACH: 306 /* 307 * Proprietary extension: 'detach' from idle mode and 308 * get back to runtime mode in case of USB Reset. As 309 * much as I dislike this, we just can't use every USB 310 * bus reset to switch back to runtime mode, since at 311 * least the Linux USB stack likes to send a number of 312 * resets in a row :( 313 */ 314 f_dfu->dfu_state = 315 DFU_STATE_dfuMANIFEST_WAIT_RST; 316 to_runtime_mode(f_dfu); 317 f_dfu->dfu_state = DFU_STATE_appIDLE; 318 break; 319 default: 320 f_dfu->dfu_state = DFU_STATE_dfuERROR; 321 value = RET_STALL; 322 break; 323 } 324 325 return value; 326 } 327 328 static int state_dfu_dnload_sync(struct f_dfu *f_dfu, 329 const struct usb_ctrlrequest *ctrl, 330 struct usb_gadget *gadget, 331 struct usb_request *req) 332 { 333 int value = 0; 334 335 switch (ctrl->bRequest) { 336 case USB_REQ_DFU_GETSTATUS: 337 handle_getstatus(req); 338 value = RET_STAT_LEN; 339 break; 340 case USB_REQ_DFU_GETSTATE: 341 handle_getstate(req); 342 break; 343 default: 344 f_dfu->dfu_state = DFU_STATE_dfuERROR; 345 value = RET_STALL; 346 break; 347 } 348 349 return value; 350 } 351 352 static int state_dfu_dnbusy(struct f_dfu *f_dfu, 353 const struct usb_ctrlrequest *ctrl, 354 struct usb_gadget *gadget, 355 struct usb_request *req) 356 { 357 int value = 0; 358 359 switch (ctrl->bRequest) { 360 case USB_REQ_DFU_GETSTATUS: 361 handle_getstatus(req); 362 value = RET_STAT_LEN; 363 break; 364 default: 365 f_dfu->dfu_state = DFU_STATE_dfuERROR; 366 value = RET_STALL; 367 break; 368 } 369 370 return value; 371 } 372 373 static int state_dfu_dnload_idle(struct f_dfu *f_dfu, 374 const struct usb_ctrlrequest *ctrl, 375 struct usb_gadget *gadget, 376 struct usb_request *req) 377 { 378 u16 w_value = le16_to_cpu(ctrl->wValue); 379 u16 len = le16_to_cpu(ctrl->wLength); 380 int value = 0; 381 382 switch (ctrl->bRequest) { 383 case USB_REQ_DFU_DNLOAD: 384 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 385 f_dfu->blk_seq_num = w_value; 386 value = handle_dnload(gadget, len); 387 break; 388 case USB_REQ_DFU_ABORT: 389 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 390 value = RET_ZLP; 391 break; 392 case USB_REQ_DFU_GETSTATUS: 393 handle_getstatus(req); 394 value = RET_STAT_LEN; 395 break; 396 case USB_REQ_DFU_GETSTATE: 397 handle_getstate(req); 398 break; 399 default: 400 f_dfu->dfu_state = DFU_STATE_dfuERROR; 401 value = RET_STALL; 402 break; 403 } 404 405 return value; 406 } 407 408 static int state_dfu_manifest_sync(struct f_dfu *f_dfu, 409 const struct usb_ctrlrequest *ctrl, 410 struct usb_gadget *gadget, 411 struct usb_request *req) 412 { 413 int value = 0; 414 415 switch (ctrl->bRequest) { 416 case USB_REQ_DFU_GETSTATUS: 417 /* We're MainfestationTolerant */ 418 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 419 handle_getstatus(req); 420 f_dfu->blk_seq_num = 0; 421 value = RET_STAT_LEN; 422 break; 423 case USB_REQ_DFU_GETSTATE: 424 handle_getstate(req); 425 break; 426 default: 427 f_dfu->dfu_state = DFU_STATE_dfuERROR; 428 value = RET_STALL; 429 break; 430 } 431 432 return value; 433 } 434 435 static int state_dfu_upload_idle(struct f_dfu *f_dfu, 436 const struct usb_ctrlrequest *ctrl, 437 struct usb_gadget *gadget, 438 struct usb_request *req) 439 { 440 u16 w_value = le16_to_cpu(ctrl->wValue); 441 u16 len = le16_to_cpu(ctrl->wLength); 442 int value = 0; 443 444 switch (ctrl->bRequest) { 445 case USB_REQ_DFU_UPLOAD: 446 /* state transition if less data then requested */ 447 f_dfu->blk_seq_num = w_value; 448 value = handle_upload(req, len); 449 if (value >= 0 && value < len) 450 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 451 break; 452 case USB_REQ_DFU_ABORT: 453 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 454 /* no zlp? */ 455 value = RET_ZLP; 456 break; 457 case USB_REQ_DFU_GETSTATUS: 458 handle_getstatus(req); 459 value = RET_STAT_LEN; 460 break; 461 case USB_REQ_DFU_GETSTATE: 462 handle_getstate(req); 463 break; 464 default: 465 f_dfu->dfu_state = DFU_STATE_dfuERROR; 466 value = RET_STALL; 467 break; 468 } 469 470 return value; 471 } 472 473 static int state_dfu_error(struct f_dfu *f_dfu, 474 const struct usb_ctrlrequest *ctrl, 475 struct usb_gadget *gadget, 476 struct usb_request *req) 477 { 478 int value = 0; 479 480 switch (ctrl->bRequest) { 481 case USB_REQ_DFU_GETSTATUS: 482 handle_getstatus(req); 483 value = RET_STAT_LEN; 484 break; 485 case USB_REQ_DFU_GETSTATE: 486 handle_getstate(req); 487 break; 488 case USB_REQ_DFU_CLRSTATUS: 489 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 490 f_dfu->dfu_status = DFU_STATUS_OK; 491 /* no zlp? */ 492 value = RET_ZLP; 493 break; 494 default: 495 f_dfu->dfu_state = DFU_STATE_dfuERROR; 496 value = RET_STALL; 497 break; 498 } 499 500 return value; 501 } 502 503 static dfu_state_fn dfu_state[] = { 504 state_app_idle, /* DFU_STATE_appIDLE */ 505 state_app_detach, /* DFU_STATE_appDETACH */ 506 state_dfu_idle, /* DFU_STATE_dfuIDLE */ 507 state_dfu_dnload_sync, /* DFU_STATE_dfuDNLOAD_SYNC */ 508 state_dfu_dnbusy, /* DFU_STATE_dfuDNBUSY */ 509 state_dfu_dnload_idle, /* DFU_STATE_dfuDNLOAD_IDLE */ 510 state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */ 511 NULL, /* DFU_STATE_dfuMANIFEST */ 512 NULL, /* DFU_STATE_dfuMANIFEST_WAIT_RST */ 513 state_dfu_upload_idle, /* DFU_STATE_dfuUPLOAD_IDLE */ 514 state_dfu_error /* DFU_STATE_dfuERROR */ 515 }; 516 517 static int 518 dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 519 { 520 struct usb_gadget *gadget = f->config->cdev->gadget; 521 struct usb_request *req = f->config->cdev->req; 522 struct f_dfu *f_dfu = f->config->cdev->req->context; 523 u16 len = le16_to_cpu(ctrl->wLength); 524 u16 w_value = le16_to_cpu(ctrl->wValue); 525 int value = 0; 526 u8 req_type = ctrl->bRequestType & USB_TYPE_MASK; 527 528 debug("w_value: 0x%x len: 0x%x\n", w_value, len); 529 debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n", 530 req_type, ctrl->bRequest, f_dfu->dfu_state); 531 532 if (req_type == USB_TYPE_STANDARD) { 533 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR && 534 (w_value >> 8) == DFU_DT_FUNC) { 535 value = min(len, (u16) sizeof(dfu_func)); 536 memcpy(req->buf, &dfu_func, value); 537 } 538 } else /* DFU specific request */ 539 value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req); 540 541 if (value >= 0) { 542 req->length = value; 543 req->zero = value < len; 544 value = usb_ep_queue(gadget->ep0, req, 0); 545 if (value < 0) { 546 debug("ep_queue --> %d\n", value); 547 req->status = 0; 548 } 549 } 550 551 return value; 552 } 553 554 /*-------------------------------------------------------------------------*/ 555 556 static int 557 dfu_prepare_strings(struct f_dfu *f_dfu, int n) 558 { 559 struct dfu_entity *de = NULL; 560 int i = 0; 561 562 f_dfu->strings = calloc(sizeof(struct usb_string), n + 1); 563 if (!f_dfu->strings) 564 goto enomem; 565 566 for (i = 0; i < n; ++i) { 567 de = dfu_get_entity(i); 568 f_dfu->strings[i].s = de->name; 569 } 570 571 f_dfu->strings[i].id = 0; 572 f_dfu->strings[i].s = NULL; 573 574 return 0; 575 576 enomem: 577 while (i) 578 f_dfu->strings[--i].s = NULL; 579 580 free(f_dfu->strings); 581 582 return -ENOMEM; 583 } 584 585 static int dfu_prepare_function(struct f_dfu *f_dfu, int n) 586 { 587 struct usb_interface_descriptor *d; 588 int i = 0; 589 590 f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n); 591 if (!f_dfu->function) 592 goto enomem; 593 594 for (i = 0; i < n; ++i) { 595 d = calloc(sizeof(*d), 1); 596 if (!d) 597 goto enomem; 598 599 d->bLength = sizeof(*d); 600 d->bDescriptorType = USB_DT_INTERFACE; 601 d->bAlternateSetting = i; 602 d->bNumEndpoints = 0; 603 d->bInterfaceClass = USB_CLASS_APP_SPEC; 604 d->bInterfaceSubClass = 1; 605 d->bInterfaceProtocol = 2; 606 607 f_dfu->function[i] = (struct usb_descriptor_header *)d; 608 } 609 f_dfu->function[i] = NULL; 610 611 return 0; 612 613 enomem: 614 while (i) { 615 free(f_dfu->function[--i]); 616 f_dfu->function[i] = NULL; 617 } 618 free(f_dfu->function); 619 620 return -ENOMEM; 621 } 622 623 static int dfu_bind(struct usb_configuration *c, struct usb_function *f) 624 { 625 struct usb_composite_dev *cdev = c->cdev; 626 struct f_dfu *f_dfu = func_to_dfu(f); 627 int alt_num = dfu_get_alt_number(); 628 int rv, id, i; 629 630 id = usb_interface_id(c, f); 631 if (id < 0) 632 return id; 633 dfu_intf_runtime.bInterfaceNumber = id; 634 635 f_dfu->dfu_state = DFU_STATE_appIDLE; 636 f_dfu->dfu_status = DFU_STATUS_OK; 637 638 rv = dfu_prepare_function(f_dfu, alt_num); 639 if (rv) 640 goto error; 641 642 rv = dfu_prepare_strings(f_dfu, alt_num); 643 if (rv) 644 goto error; 645 for (i = 0; i < alt_num; i++) { 646 id = usb_string_id(cdev); 647 if (id < 0) 648 return id; 649 f_dfu->strings[i].id = id; 650 ((struct usb_interface_descriptor *)f_dfu->function[i]) 651 ->iInterface = id; 652 } 653 654 stringtab_dfu.strings = f_dfu->strings; 655 656 cdev->req->context = f_dfu; 657 658 error: 659 return rv; 660 } 661 662 static void dfu_unbind(struct usb_configuration *c, struct usb_function *f) 663 { 664 struct f_dfu *f_dfu = func_to_dfu(f); 665 int alt_num = dfu_get_alt_number(); 666 int i; 667 668 if (f_dfu->strings) { 669 i = alt_num; 670 while (i) 671 f_dfu->strings[--i].s = NULL; 672 673 free(f_dfu->strings); 674 } 675 676 if (f_dfu->function) { 677 i = alt_num; 678 while (i) { 679 free(f_dfu->function[--i]); 680 f_dfu->function[i] = NULL; 681 } 682 free(f_dfu->function); 683 } 684 685 free(f_dfu); 686 } 687 688 static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 689 { 690 struct f_dfu *f_dfu = func_to_dfu(f); 691 692 debug("%s: intf:%d alt:%d\n", __func__, intf, alt); 693 694 f_dfu->altsetting = alt; 695 696 return 0; 697 } 698 699 /* TODO: is this really what we need here? */ 700 static void dfu_disable(struct usb_function *f) 701 { 702 struct f_dfu *f_dfu = func_to_dfu(f); 703 if (f_dfu->config == 0) 704 return; 705 706 debug("%s: reset config\n", __func__); 707 708 f_dfu->config = 0; 709 } 710 711 static int dfu_bind_config(struct usb_configuration *c) 712 { 713 struct f_dfu *f_dfu; 714 int status; 715 716 f_dfu = calloc(sizeof(*f_dfu), 1); 717 if (!f_dfu) 718 return -ENOMEM; 719 f_dfu->usb_function.name = "dfu"; 720 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 721 f_dfu->usb_function.bind = dfu_bind; 722 f_dfu->usb_function.unbind = dfu_unbind; 723 f_dfu->usb_function.set_alt = dfu_set_alt; 724 f_dfu->usb_function.disable = dfu_disable; 725 f_dfu->usb_function.strings = dfu_generic_strings, 726 f_dfu->usb_function.setup = dfu_handle, 727 728 status = usb_add_function(c, &f_dfu->usb_function); 729 if (status) 730 free(f_dfu); 731 732 return status; 733 } 734 735 int dfu_add(struct usb_configuration *c) 736 { 737 int id; 738 739 id = usb_string_id(c->cdev); 740 if (id < 0) 741 return id; 742 strings_dfu_generic[0].id = id; 743 dfu_intf_runtime.iInterface = id; 744 745 debug("%s: cdev: 0x%p gadget:0x%p gadget->ep0: 0x%p\n", __func__, 746 c->cdev, c->cdev->gadget, c->cdev->gadget->ep0); 747 748 return dfu_bind_config(c); 749 } 750