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 <linux/usb/gadget.h> 29 #include <linux/usb/composite.h> 30 31 #include <dfu.h> 32 #include "f_dfu.h" 33 34 struct f_dfu { 35 struct usb_function usb_function; 36 37 struct usb_descriptor_header **function; 38 struct usb_string *strings; 39 40 /* when configured, we have one config */ 41 u8 config; 42 u8 altsetting; 43 enum dfu_state dfu_state; 44 unsigned int dfu_status; 45 46 /* Send/received block number is handy for data integrity check */ 47 int blk_seq_num; 48 }; 49 50 typedef int (*dfu_state_fn) (struct f_dfu *, 51 const struct usb_ctrlrequest *, 52 struct usb_gadget *, 53 struct usb_request *); 54 55 static inline struct f_dfu *func_to_dfu(struct usb_function *f) 56 { 57 return container_of(f, struct f_dfu, usb_function); 58 } 59 60 static const struct dfu_function_descriptor dfu_func = { 61 .bLength = sizeof dfu_func, 62 .bDescriptorType = DFU_DT_FUNC, 63 .bmAttributes = DFU_BIT_WILL_DETACH | 64 DFU_BIT_MANIFESTATION_TOLERANT | 65 DFU_BIT_CAN_UPLOAD | 66 DFU_BIT_CAN_DNLOAD, 67 .wDetachTimeOut = 0, 68 .wTransferSize = DFU_USB_BUFSIZ, 69 .bcdDFUVersion = __constant_cpu_to_le16(0x0110), 70 }; 71 72 static struct usb_interface_descriptor dfu_intf_runtime = { 73 .bLength = sizeof dfu_intf_runtime, 74 .bDescriptorType = USB_DT_INTERFACE, 75 .bNumEndpoints = 0, 76 .bInterfaceClass = USB_CLASS_APP_SPEC, 77 .bInterfaceSubClass = 1, 78 .bInterfaceProtocol = 1, 79 /* .iInterface = DYNAMIC */ 80 }; 81 82 static struct usb_descriptor_header *dfu_runtime_descs[] = { 83 (struct usb_descriptor_header *) &dfu_intf_runtime, 84 NULL, 85 }; 86 87 static const struct usb_qualifier_descriptor dev_qualifier = { 88 .bLength = sizeof dev_qualifier, 89 .bDescriptorType = USB_DT_DEVICE_QUALIFIER, 90 .bcdUSB = __constant_cpu_to_le16(0x0200), 91 .bDeviceClass = USB_CLASS_VENDOR_SPEC, 92 .bNumConfigurations = 1, 93 }; 94 95 static const char dfu_name[] = "Device Firmware Upgrade"; 96 97 /* 98 * static strings, in UTF-8 99 * 100 * dfu_generic configuration 101 */ 102 static struct usb_string strings_dfu_generic[] = { 103 [0].s = dfu_name, 104 { } /* end of list */ 105 }; 106 107 static struct usb_gadget_strings stringtab_dfu_generic = { 108 .language = 0x0409, /* en-us */ 109 .strings = strings_dfu_generic, 110 }; 111 112 static struct usb_gadget_strings *dfu_generic_strings[] = { 113 &stringtab_dfu_generic, 114 NULL, 115 }; 116 117 /* 118 * usb_function specific 119 */ 120 static struct usb_gadget_strings stringtab_dfu = { 121 .language = 0x0409, /* en-us */ 122 /* 123 * .strings 124 * 125 * assigned during initialization, 126 * depends on number of flash entities 127 * 128 */ 129 }; 130 131 static struct usb_gadget_strings *dfu_strings[] = { 132 &stringtab_dfu, 133 NULL, 134 }; 135 136 /*-------------------------------------------------------------------------*/ 137 138 static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req) 139 { 140 struct f_dfu *f_dfu = req->context; 141 142 dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf, 143 req->length, f_dfu->blk_seq_num); 144 145 if (req->length == 0) 146 puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n"); 147 } 148 149 static void handle_getstatus(struct usb_request *req) 150 { 151 struct dfu_status *dstat = (struct dfu_status *)req->buf; 152 struct f_dfu *f_dfu = req->context; 153 154 switch (f_dfu->dfu_state) { 155 case DFU_STATE_dfuDNLOAD_SYNC: 156 case DFU_STATE_dfuDNBUSY: 157 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE; 158 break; 159 case DFU_STATE_dfuMANIFEST_SYNC: 160 break; 161 default: 162 break; 163 } 164 165 /* send status response */ 166 dstat->bStatus = f_dfu->dfu_status; 167 dstat->bwPollTimeout[0] = 0; 168 dstat->bwPollTimeout[1] = 0; 169 dstat->bwPollTimeout[2] = 0; 170 dstat->bState = f_dfu->dfu_state; 171 dstat->iString = 0; 172 } 173 174 static void handle_getstate(struct usb_request *req) 175 { 176 struct f_dfu *f_dfu = req->context; 177 178 ((u8 *)req->buf)[0] = f_dfu->dfu_state; 179 req->actual = sizeof(u8); 180 } 181 182 static inline void to_dfu_mode(struct f_dfu *f_dfu) 183 { 184 f_dfu->usb_function.strings = dfu_strings; 185 f_dfu->usb_function.hs_descriptors = f_dfu->function; 186 } 187 188 static inline void to_runtime_mode(struct f_dfu *f_dfu) 189 { 190 f_dfu->usb_function.strings = NULL; 191 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 192 } 193 194 static int handle_upload(struct usb_request *req, u16 len) 195 { 196 struct f_dfu *f_dfu = req->context; 197 198 return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf, 199 req->length, f_dfu->blk_seq_num); 200 } 201 202 static int handle_dnload(struct usb_gadget *gadget, u16 len) 203 { 204 struct usb_composite_dev *cdev = get_gadget_data(gadget); 205 struct usb_request *req = cdev->req; 206 struct f_dfu *f_dfu = req->context; 207 208 if (len == 0) 209 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC; 210 211 req->complete = dnload_request_complete; 212 213 return len; 214 } 215 216 /*-------------------------------------------------------------------------*/ 217 /* DFU state machine */ 218 static int state_app_idle(struct f_dfu *f_dfu, 219 const struct usb_ctrlrequest *ctrl, 220 struct usb_gadget *gadget, 221 struct usb_request *req) 222 { 223 int value = 0; 224 225 switch (ctrl->bRequest) { 226 case USB_REQ_DFU_GETSTATUS: 227 handle_getstatus(req); 228 value = RET_STAT_LEN; 229 break; 230 case USB_REQ_DFU_GETSTATE: 231 handle_getstate(req); 232 break; 233 case USB_REQ_DFU_DETACH: 234 f_dfu->dfu_state = DFU_STATE_appDETACH; 235 to_dfu_mode(f_dfu); 236 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 237 value = RET_ZLP; 238 break; 239 default: 240 value = RET_STALL; 241 break; 242 } 243 244 return value; 245 } 246 247 static int state_app_detach(struct f_dfu *f_dfu, 248 const struct usb_ctrlrequest *ctrl, 249 struct usb_gadget *gadget, 250 struct usb_request *req) 251 { 252 int value = 0; 253 254 switch (ctrl->bRequest) { 255 case USB_REQ_DFU_GETSTATUS: 256 handle_getstatus(req); 257 value = RET_STAT_LEN; 258 break; 259 case USB_REQ_DFU_GETSTATE: 260 handle_getstate(req); 261 break; 262 default: 263 f_dfu->dfu_state = DFU_STATE_appIDLE; 264 value = RET_STALL; 265 break; 266 } 267 268 return value; 269 } 270 271 static int state_dfu_idle(struct f_dfu *f_dfu, 272 const struct usb_ctrlrequest *ctrl, 273 struct usb_gadget *gadget, 274 struct usb_request *req) 275 { 276 u16 w_value = le16_to_cpu(ctrl->wValue); 277 u16 len = le16_to_cpu(ctrl->wLength); 278 int value = 0; 279 280 switch (ctrl->bRequest) { 281 case USB_REQ_DFU_DNLOAD: 282 if (len == 0) { 283 f_dfu->dfu_state = DFU_STATE_dfuERROR; 284 value = RET_STALL; 285 break; 286 } 287 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 288 f_dfu->blk_seq_num = w_value; 289 value = handle_dnload(gadget, len); 290 break; 291 case USB_REQ_DFU_UPLOAD: 292 f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE; 293 f_dfu->blk_seq_num = 0; 294 value = handle_upload(req, len); 295 break; 296 case USB_REQ_DFU_ABORT: 297 /* no zlp? */ 298 value = RET_ZLP; 299 break; 300 case USB_REQ_DFU_GETSTATUS: 301 handle_getstatus(req); 302 value = RET_STAT_LEN; 303 break; 304 case USB_REQ_DFU_GETSTATE: 305 handle_getstate(req); 306 break; 307 case USB_REQ_DFU_DETACH: 308 /* 309 * Proprietary extension: 'detach' from idle mode and 310 * get back to runtime mode in case of USB Reset. As 311 * much as I dislike this, we just can't use every USB 312 * bus reset to switch back to runtime mode, since at 313 * least the Linux USB stack likes to send a number of 314 * resets in a row :( 315 */ 316 f_dfu->dfu_state = 317 DFU_STATE_dfuMANIFEST_WAIT_RST; 318 to_runtime_mode(f_dfu); 319 f_dfu->dfu_state = DFU_STATE_appIDLE; 320 break; 321 default: 322 f_dfu->dfu_state = DFU_STATE_dfuERROR; 323 value = RET_STALL; 324 break; 325 } 326 327 return value; 328 } 329 330 static int state_dfu_dnload_sync(struct f_dfu *f_dfu, 331 const struct usb_ctrlrequest *ctrl, 332 struct usb_gadget *gadget, 333 struct usb_request *req) 334 { 335 int value = 0; 336 337 switch (ctrl->bRequest) { 338 case USB_REQ_DFU_GETSTATUS: 339 handle_getstatus(req); 340 value = RET_STAT_LEN; 341 break; 342 case USB_REQ_DFU_GETSTATE: 343 handle_getstate(req); 344 break; 345 default: 346 f_dfu->dfu_state = DFU_STATE_dfuERROR; 347 value = RET_STALL; 348 break; 349 } 350 351 return value; 352 } 353 354 static int state_dfu_dnbusy(struct f_dfu *f_dfu, 355 const struct usb_ctrlrequest *ctrl, 356 struct usb_gadget *gadget, 357 struct usb_request *req) 358 { 359 int value = 0; 360 361 switch (ctrl->bRequest) { 362 case USB_REQ_DFU_GETSTATUS: 363 handle_getstatus(req); 364 value = RET_STAT_LEN; 365 break; 366 default: 367 f_dfu->dfu_state = DFU_STATE_dfuERROR; 368 value = RET_STALL; 369 break; 370 } 371 372 return value; 373 } 374 375 static int state_dfu_dnload_idle(struct f_dfu *f_dfu, 376 const struct usb_ctrlrequest *ctrl, 377 struct usb_gadget *gadget, 378 struct usb_request *req) 379 { 380 u16 w_value = le16_to_cpu(ctrl->wValue); 381 u16 len = le16_to_cpu(ctrl->wLength); 382 int value = 0; 383 384 switch (ctrl->bRequest) { 385 case USB_REQ_DFU_DNLOAD: 386 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 387 f_dfu->blk_seq_num = w_value; 388 value = handle_dnload(gadget, len); 389 break; 390 case USB_REQ_DFU_ABORT: 391 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 392 value = RET_ZLP; 393 break; 394 case USB_REQ_DFU_GETSTATUS: 395 handle_getstatus(req); 396 value = RET_STAT_LEN; 397 break; 398 case USB_REQ_DFU_GETSTATE: 399 handle_getstate(req); 400 break; 401 default: 402 f_dfu->dfu_state = DFU_STATE_dfuERROR; 403 value = RET_STALL; 404 break; 405 } 406 407 return value; 408 } 409 410 static int state_dfu_manifest_sync(struct f_dfu *f_dfu, 411 const struct usb_ctrlrequest *ctrl, 412 struct usb_gadget *gadget, 413 struct usb_request *req) 414 { 415 int value = 0; 416 417 switch (ctrl->bRequest) { 418 case USB_REQ_DFU_GETSTATUS: 419 /* We're MainfestationTolerant */ 420 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 421 handle_getstatus(req); 422 f_dfu->blk_seq_num = 0; 423 value = RET_STAT_LEN; 424 break; 425 case USB_REQ_DFU_GETSTATE: 426 handle_getstate(req); 427 break; 428 default: 429 f_dfu->dfu_state = DFU_STATE_dfuERROR; 430 value = RET_STALL; 431 break; 432 } 433 434 return value; 435 } 436 437 static int state_dfu_upload_idle(struct f_dfu *f_dfu, 438 const struct usb_ctrlrequest *ctrl, 439 struct usb_gadget *gadget, 440 struct usb_request *req) 441 { 442 u16 w_value = le16_to_cpu(ctrl->wValue); 443 u16 len = le16_to_cpu(ctrl->wLength); 444 int value = 0; 445 446 switch (ctrl->bRequest) { 447 case USB_REQ_DFU_UPLOAD: 448 /* state transition if less data then requested */ 449 f_dfu->blk_seq_num = w_value; 450 value = handle_upload(req, len); 451 if (value >= 0 && value < len) 452 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 453 break; 454 case USB_REQ_DFU_ABORT: 455 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 456 /* no zlp? */ 457 value = RET_ZLP; 458 break; 459 case USB_REQ_DFU_GETSTATUS: 460 handle_getstatus(req); 461 value = RET_STAT_LEN; 462 break; 463 case USB_REQ_DFU_GETSTATE: 464 handle_getstate(req); 465 break; 466 default: 467 f_dfu->dfu_state = DFU_STATE_dfuERROR; 468 value = RET_STALL; 469 break; 470 } 471 472 return value; 473 } 474 475 static int state_dfu_error(struct f_dfu *f_dfu, 476 const struct usb_ctrlrequest *ctrl, 477 struct usb_gadget *gadget, 478 struct usb_request *req) 479 { 480 int value = 0; 481 482 switch (ctrl->bRequest) { 483 case USB_REQ_DFU_GETSTATUS: 484 handle_getstatus(req); 485 value = RET_STAT_LEN; 486 break; 487 case USB_REQ_DFU_GETSTATE: 488 handle_getstate(req); 489 break; 490 case USB_REQ_DFU_CLRSTATUS: 491 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 492 f_dfu->dfu_status = DFU_STATUS_OK; 493 /* no zlp? */ 494 value = RET_ZLP; 495 break; 496 default: 497 f_dfu->dfu_state = DFU_STATE_dfuERROR; 498 value = RET_STALL; 499 break; 500 } 501 502 return value; 503 } 504 505 static dfu_state_fn dfu_state[] = { 506 state_app_idle, /* DFU_STATE_appIDLE */ 507 state_app_detach, /* DFU_STATE_appDETACH */ 508 state_dfu_idle, /* DFU_STATE_dfuIDLE */ 509 state_dfu_dnload_sync, /* DFU_STATE_dfuDNLOAD_SYNC */ 510 state_dfu_dnbusy, /* DFU_STATE_dfuDNBUSY */ 511 state_dfu_dnload_idle, /* DFU_STATE_dfuDNLOAD_IDLE */ 512 state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */ 513 NULL, /* DFU_STATE_dfuMANIFEST */ 514 NULL, /* DFU_STATE_dfuMANIFEST_WAIT_RST */ 515 state_dfu_upload_idle, /* DFU_STATE_dfuUPLOAD_IDLE */ 516 state_dfu_error /* DFU_STATE_dfuERROR */ 517 }; 518 519 static int 520 dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 521 { 522 struct usb_gadget *gadget = f->config->cdev->gadget; 523 struct usb_request *req = f->config->cdev->req; 524 struct f_dfu *f_dfu = f->config->cdev->req->context; 525 u16 len = le16_to_cpu(ctrl->wLength); 526 u16 w_value = le16_to_cpu(ctrl->wValue); 527 int value = 0; 528 u8 req_type = ctrl->bRequestType & USB_TYPE_MASK; 529 530 debug("w_value: 0x%x len: 0x%x\n", w_value, len); 531 debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n", 532 req_type, ctrl->bRequest, f_dfu->dfu_state); 533 534 if (req_type == USB_TYPE_STANDARD) { 535 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR && 536 (w_value >> 8) == DFU_DT_FUNC) { 537 value = min(len, (u16) sizeof(dfu_func)); 538 memcpy(req->buf, &dfu_func, value); 539 } 540 } else /* DFU specific request */ 541 value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req); 542 543 if (value >= 0) { 544 req->length = value; 545 req->zero = value < len; 546 value = usb_ep_queue(gadget->ep0, req, 0); 547 if (value < 0) { 548 debug("ep_queue --> %d\n", value); 549 req->status = 0; 550 } 551 } 552 553 return value; 554 } 555 556 /*-------------------------------------------------------------------------*/ 557 558 static int 559 dfu_prepare_strings(struct f_dfu *f_dfu, int n) 560 { 561 struct dfu_entity *de = NULL; 562 int i = 0; 563 564 f_dfu->strings = calloc(sizeof(struct usb_string), n + 1); 565 if (!f_dfu->strings) 566 goto enomem; 567 568 for (i = 0; i < n; ++i) { 569 de = dfu_get_entity(i); 570 f_dfu->strings[i].s = de->name; 571 } 572 573 f_dfu->strings[i].id = 0; 574 f_dfu->strings[i].s = NULL; 575 576 return 0; 577 578 enomem: 579 while (i) 580 f_dfu->strings[--i].s = NULL; 581 582 free(f_dfu->strings); 583 584 return -ENOMEM; 585 } 586 587 static int dfu_prepare_function(struct f_dfu *f_dfu, int n) 588 { 589 struct usb_interface_descriptor *d; 590 int i = 0; 591 592 f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n); 593 if (!f_dfu->function) 594 goto enomem; 595 596 for (i = 0; i < n; ++i) { 597 d = calloc(sizeof(*d), 1); 598 if (!d) 599 goto enomem; 600 601 d->bLength = sizeof(*d); 602 d->bDescriptorType = USB_DT_INTERFACE; 603 d->bAlternateSetting = i; 604 d->bNumEndpoints = 0; 605 d->bInterfaceClass = USB_CLASS_APP_SPEC; 606 d->bInterfaceSubClass = 1; 607 d->bInterfaceProtocol = 2; 608 609 f_dfu->function[i] = (struct usb_descriptor_header *)d; 610 } 611 f_dfu->function[i] = NULL; 612 613 return 0; 614 615 enomem: 616 while (i) { 617 free(f_dfu->function[--i]); 618 f_dfu->function[i] = NULL; 619 } 620 free(f_dfu->function); 621 622 return -ENOMEM; 623 } 624 625 static int dfu_bind(struct usb_configuration *c, struct usb_function *f) 626 { 627 struct usb_composite_dev *cdev = c->cdev; 628 struct f_dfu *f_dfu = func_to_dfu(f); 629 int alt_num = dfu_get_alt_number(); 630 int rv, id, i; 631 632 id = usb_interface_id(c, f); 633 if (id < 0) 634 return id; 635 dfu_intf_runtime.bInterfaceNumber = id; 636 637 f_dfu->dfu_state = DFU_STATE_appIDLE; 638 f_dfu->dfu_status = DFU_STATUS_OK; 639 640 rv = dfu_prepare_function(f_dfu, alt_num); 641 if (rv) 642 goto error; 643 644 rv = dfu_prepare_strings(f_dfu, alt_num); 645 if (rv) 646 goto error; 647 for (i = 0; i < alt_num; i++) { 648 id = usb_string_id(cdev); 649 if (id < 0) 650 return id; 651 f_dfu->strings[i].id = id; 652 ((struct usb_interface_descriptor *)f_dfu->function[i]) 653 ->iInterface = id; 654 } 655 656 stringtab_dfu.strings = f_dfu->strings; 657 658 cdev->req->context = f_dfu; 659 660 error: 661 return rv; 662 } 663 664 static void dfu_unbind(struct usb_configuration *c, struct usb_function *f) 665 { 666 struct f_dfu *f_dfu = func_to_dfu(f); 667 int alt_num = dfu_get_alt_number(); 668 int i; 669 670 if (f_dfu->strings) { 671 i = alt_num; 672 while (i) 673 f_dfu->strings[--i].s = NULL; 674 675 free(f_dfu->strings); 676 } 677 678 if (f_dfu->function) { 679 i = alt_num; 680 while (i) { 681 free(f_dfu->function[--i]); 682 f_dfu->function[i] = NULL; 683 } 684 free(f_dfu->function); 685 } 686 687 free(f_dfu); 688 } 689 690 static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 691 { 692 struct f_dfu *f_dfu = func_to_dfu(f); 693 694 debug("%s: intf:%d alt:%d\n", __func__, intf, alt); 695 696 f_dfu->altsetting = alt; 697 698 return 0; 699 } 700 701 /* TODO: is this really what we need here? */ 702 static void dfu_disable(struct usb_function *f) 703 { 704 struct f_dfu *f_dfu = func_to_dfu(f); 705 if (f_dfu->config == 0) 706 return; 707 708 debug("%s: reset config\n", __func__); 709 710 f_dfu->config = 0; 711 } 712 713 static int dfu_bind_config(struct usb_configuration *c) 714 { 715 struct f_dfu *f_dfu; 716 int status; 717 718 f_dfu = calloc(sizeof(*f_dfu), 1); 719 if (!f_dfu) 720 return -ENOMEM; 721 f_dfu->usb_function.name = "dfu"; 722 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 723 f_dfu->usb_function.bind = dfu_bind; 724 f_dfu->usb_function.unbind = dfu_unbind; 725 f_dfu->usb_function.set_alt = dfu_set_alt; 726 f_dfu->usb_function.disable = dfu_disable; 727 f_dfu->usb_function.strings = dfu_generic_strings, 728 f_dfu->usb_function.setup = dfu_handle, 729 730 status = usb_add_function(c, &f_dfu->usb_function); 731 if (status) 732 free(f_dfu); 733 734 return status; 735 } 736 737 int dfu_add(struct usb_configuration *c) 738 { 739 int id; 740 741 id = usb_string_id(c->cdev); 742 if (id < 0) 743 return id; 744 strings_dfu_generic[0].id = id; 745 dfu_intf_runtime.iInterface = id; 746 747 debug("%s: cdev: 0x%p gadget:0x%p gadget->ep0: 0x%p\n", __func__, 748 c->cdev, c->cdev->gadget, c->cdev->gadget->ep0); 749 750 return dfu_bind_config(c); 751 } 752