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 <g_dnl.h> 28 #include "f_dfu.h" 29 30 struct f_dfu { 31 struct usb_function usb_function; 32 33 struct usb_descriptor_header **function; 34 struct usb_string *strings; 35 36 /* when configured, we have one config */ 37 u8 config; 38 u8 altsetting; 39 enum dfu_state dfu_state; 40 unsigned int dfu_status; 41 42 /* Send/received block number is handy for data integrity check */ 43 int blk_seq_num; 44 unsigned int poll_timeout; 45 }; 46 47 typedef int (*dfu_state_fn) (struct f_dfu *, 48 const struct usb_ctrlrequest *, 49 struct usb_gadget *, 50 struct usb_request *); 51 52 static inline struct f_dfu *func_to_dfu(struct usb_function *f) 53 { 54 return container_of(f, struct f_dfu, usb_function); 55 } 56 57 static const struct dfu_function_descriptor dfu_func = { 58 .bLength = sizeof dfu_func, 59 .bDescriptorType = DFU_DT_FUNC, 60 .bmAttributes = DFU_BIT_WILL_DETACH | 61 DFU_BIT_MANIFESTATION_TOLERANT | 62 DFU_BIT_CAN_UPLOAD | 63 DFU_BIT_CAN_DNLOAD, 64 .wDetachTimeOut = 0, 65 .wTransferSize = DFU_USB_BUFSIZ, 66 .bcdDFUVersion = __constant_cpu_to_le16(0x0110), 67 }; 68 69 static struct usb_interface_descriptor dfu_intf_runtime = { 70 .bLength = sizeof dfu_intf_runtime, 71 .bDescriptorType = USB_DT_INTERFACE, 72 .bNumEndpoints = 0, 73 .bInterfaceClass = USB_CLASS_APP_SPEC, 74 .bInterfaceSubClass = 1, 75 .bInterfaceProtocol = 1, 76 /* .iInterface = DYNAMIC */ 77 }; 78 79 static struct usb_descriptor_header *dfu_runtime_descs[] = { 80 (struct usb_descriptor_header *) &dfu_intf_runtime, 81 NULL, 82 }; 83 84 static const char dfu_name[] = "Device Firmware Upgrade"; 85 86 /* 87 * static strings, in UTF-8 88 * 89 * dfu_generic configuration 90 */ 91 static struct usb_string strings_dfu_generic[] = { 92 [0].s = dfu_name, 93 { } /* end of list */ 94 }; 95 96 static struct usb_gadget_strings stringtab_dfu_generic = { 97 .language = 0x0409, /* en-us */ 98 .strings = strings_dfu_generic, 99 }; 100 101 static struct usb_gadget_strings *dfu_generic_strings[] = { 102 &stringtab_dfu_generic, 103 NULL, 104 }; 105 106 /* 107 * usb_function specific 108 */ 109 static struct usb_gadget_strings stringtab_dfu = { 110 .language = 0x0409, /* en-us */ 111 /* 112 * .strings 113 * 114 * assigned during initialization, 115 * depends on number of flash entities 116 * 117 */ 118 }; 119 120 static struct usb_gadget_strings *dfu_strings[] = { 121 &stringtab_dfu, 122 NULL, 123 }; 124 125 static void dfu_set_poll_timeout(struct dfu_status *dstat, unsigned int ms) 126 { 127 /* 128 * The bwPollTimeout DFU_GETSTATUS request payload provides information 129 * about minimum time, in milliseconds, that the host should wait before 130 * sending a subsequent DFU_GETSTATUS request 131 * 132 * This permits the device to vary the delay depending on its need to 133 * erase or program the memory 134 * 135 */ 136 137 unsigned char *p = (unsigned char *)&ms; 138 139 if (!ms || (ms & ~DFU_POLL_TIMEOUT_MASK)) { 140 dstat->bwPollTimeout[0] = 0; 141 dstat->bwPollTimeout[1] = 0; 142 dstat->bwPollTimeout[2] = 0; 143 144 return; 145 } 146 147 dstat->bwPollTimeout[0] = *p++; 148 dstat->bwPollTimeout[1] = *p++; 149 dstat->bwPollTimeout[2] = *p; 150 } 151 152 /*-------------------------------------------------------------------------*/ 153 154 static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req) 155 { 156 struct f_dfu *f_dfu = req->context; 157 int ret; 158 159 ret = dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf, 160 req->length, f_dfu->blk_seq_num); 161 if (ret) { 162 f_dfu->dfu_status = DFU_STATUS_errUNKNOWN; 163 f_dfu->dfu_state = DFU_STATE_dfuERROR; 164 } 165 } 166 167 static void dnload_request_flush(struct usb_ep *ep, struct usb_request *req) 168 { 169 struct f_dfu *f_dfu = req->context; 170 int ret; 171 172 ret = dfu_flush(dfu_get_entity(f_dfu->altsetting), req->buf, 173 req->length, f_dfu->blk_seq_num); 174 if (ret) { 175 f_dfu->dfu_status = DFU_STATUS_errUNKNOWN; 176 f_dfu->dfu_state = DFU_STATE_dfuERROR; 177 } 178 } 179 180 static inline int dfu_get_manifest_timeout(struct dfu_entity *dfu) 181 { 182 return dfu->poll_timeout ? dfu->poll_timeout(dfu) : 183 DFU_MANIFEST_POLL_TIMEOUT; 184 } 185 186 static void handle_getstatus(struct usb_request *req) 187 { 188 struct dfu_status *dstat = (struct dfu_status *)req->buf; 189 struct f_dfu *f_dfu = req->context; 190 struct dfu_entity *dfu = dfu_get_entity(f_dfu->altsetting); 191 192 dfu_set_poll_timeout(dstat, 0); 193 194 switch (f_dfu->dfu_state) { 195 case DFU_STATE_dfuDNLOAD_SYNC: 196 case DFU_STATE_dfuDNBUSY: 197 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE; 198 break; 199 case DFU_STATE_dfuMANIFEST_SYNC: 200 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST; 201 break; 202 case DFU_STATE_dfuMANIFEST: 203 dfu_set_poll_timeout(dstat, dfu_get_manifest_timeout(dfu)); 204 break; 205 default: 206 break; 207 } 208 209 if (f_dfu->poll_timeout) 210 if (!(f_dfu->blk_seq_num % 211 (dfu_get_buf_size() / DFU_USB_BUFSIZ))) 212 dfu_set_poll_timeout(dstat, f_dfu->poll_timeout); 213 214 /* send status response */ 215 dstat->bStatus = f_dfu->dfu_status; 216 dstat->bState = f_dfu->dfu_state; 217 dstat->iString = 0; 218 } 219 220 static void handle_getstate(struct usb_request *req) 221 { 222 struct f_dfu *f_dfu = req->context; 223 224 ((u8 *)req->buf)[0] = f_dfu->dfu_state; 225 req->actual = sizeof(u8); 226 } 227 228 static inline void to_dfu_mode(struct f_dfu *f_dfu) 229 { 230 f_dfu->usb_function.strings = dfu_strings; 231 f_dfu->usb_function.hs_descriptors = f_dfu->function; 232 f_dfu->usb_function.descriptors = f_dfu->function; 233 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 234 } 235 236 static inline void to_runtime_mode(struct f_dfu *f_dfu) 237 { 238 f_dfu->usb_function.strings = NULL; 239 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 240 f_dfu->usb_function.descriptors = dfu_runtime_descs; 241 } 242 243 static int handle_upload(struct usb_request *req, u16 len) 244 { 245 struct f_dfu *f_dfu = req->context; 246 247 return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf, 248 req->length, f_dfu->blk_seq_num); 249 } 250 251 static int handle_dnload(struct usb_gadget *gadget, u16 len) 252 { 253 struct usb_composite_dev *cdev = get_gadget_data(gadget); 254 struct usb_request *req = cdev->req; 255 struct f_dfu *f_dfu = req->context; 256 257 if (len == 0) 258 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC; 259 260 req->complete = dnload_request_complete; 261 262 return len; 263 } 264 265 /*-------------------------------------------------------------------------*/ 266 /* DFU state machine */ 267 static int state_app_idle(struct f_dfu *f_dfu, 268 const struct usb_ctrlrequest *ctrl, 269 struct usb_gadget *gadget, 270 struct usb_request *req) 271 { 272 int value = 0; 273 274 switch (ctrl->bRequest) { 275 case USB_REQ_DFU_GETSTATUS: 276 handle_getstatus(req); 277 value = RET_STAT_LEN; 278 break; 279 case USB_REQ_DFU_GETSTATE: 280 handle_getstate(req); 281 break; 282 case USB_REQ_DFU_DETACH: 283 f_dfu->dfu_state = DFU_STATE_appDETACH; 284 to_dfu_mode(f_dfu); 285 value = RET_ZLP; 286 break; 287 default: 288 value = RET_STALL; 289 break; 290 } 291 292 return value; 293 } 294 295 static int state_app_detach(struct f_dfu *f_dfu, 296 const struct usb_ctrlrequest *ctrl, 297 struct usb_gadget *gadget, 298 struct usb_request *req) 299 { 300 int value = 0; 301 302 switch (ctrl->bRequest) { 303 case USB_REQ_DFU_GETSTATUS: 304 handle_getstatus(req); 305 value = RET_STAT_LEN; 306 break; 307 case USB_REQ_DFU_GETSTATE: 308 handle_getstate(req); 309 break; 310 default: 311 f_dfu->dfu_state = DFU_STATE_appIDLE; 312 value = RET_STALL; 313 break; 314 } 315 316 return value; 317 } 318 319 static int state_dfu_idle(struct f_dfu *f_dfu, 320 const struct usb_ctrlrequest *ctrl, 321 struct usb_gadget *gadget, 322 struct usb_request *req) 323 { 324 u16 w_value = le16_to_cpu(ctrl->wValue); 325 u16 len = le16_to_cpu(ctrl->wLength); 326 int value = 0; 327 328 switch (ctrl->bRequest) { 329 case USB_REQ_DFU_DNLOAD: 330 if (len == 0) { 331 f_dfu->dfu_state = DFU_STATE_dfuERROR; 332 value = RET_STALL; 333 break; 334 } 335 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 336 f_dfu->blk_seq_num = w_value; 337 value = handle_dnload(gadget, len); 338 break; 339 case USB_REQ_DFU_UPLOAD: 340 f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE; 341 f_dfu->blk_seq_num = 0; 342 value = handle_upload(req, len); 343 break; 344 case USB_REQ_DFU_ABORT: 345 /* no zlp? */ 346 value = RET_ZLP; 347 break; 348 case USB_REQ_DFU_GETSTATUS: 349 handle_getstatus(req); 350 value = RET_STAT_LEN; 351 break; 352 case USB_REQ_DFU_GETSTATE: 353 handle_getstate(req); 354 break; 355 case USB_REQ_DFU_DETACH: 356 /* 357 * Proprietary extension: 'detach' from idle mode and 358 * get back to runtime mode in case of USB Reset. As 359 * much as I dislike this, we just can't use every USB 360 * bus reset to switch back to runtime mode, since at 361 * least the Linux USB stack likes to send a number of 362 * resets in a row :( 363 */ 364 f_dfu->dfu_state = 365 DFU_STATE_dfuMANIFEST_WAIT_RST; 366 to_runtime_mode(f_dfu); 367 f_dfu->dfu_state = DFU_STATE_appIDLE; 368 369 g_dnl_trigger_detach(); 370 break; 371 default: 372 f_dfu->dfu_state = DFU_STATE_dfuERROR; 373 value = RET_STALL; 374 break; 375 } 376 377 return value; 378 } 379 380 static int state_dfu_dnload_sync(struct f_dfu *f_dfu, 381 const struct usb_ctrlrequest *ctrl, 382 struct usb_gadget *gadget, 383 struct usb_request *req) 384 { 385 int value = 0; 386 387 switch (ctrl->bRequest) { 388 case USB_REQ_DFU_GETSTATUS: 389 handle_getstatus(req); 390 value = RET_STAT_LEN; 391 break; 392 case USB_REQ_DFU_GETSTATE: 393 handle_getstate(req); 394 break; 395 default: 396 f_dfu->dfu_state = DFU_STATE_dfuERROR; 397 value = RET_STALL; 398 break; 399 } 400 401 return value; 402 } 403 404 static int state_dfu_dnbusy(struct f_dfu *f_dfu, 405 const struct usb_ctrlrequest *ctrl, 406 struct usb_gadget *gadget, 407 struct usb_request *req) 408 { 409 int value = 0; 410 411 switch (ctrl->bRequest) { 412 case USB_REQ_DFU_GETSTATUS: 413 handle_getstatus(req); 414 value = RET_STAT_LEN; 415 break; 416 default: 417 f_dfu->dfu_state = DFU_STATE_dfuERROR; 418 value = RET_STALL; 419 break; 420 } 421 422 return value; 423 } 424 425 static int state_dfu_dnload_idle(struct f_dfu *f_dfu, 426 const struct usb_ctrlrequest *ctrl, 427 struct usb_gadget *gadget, 428 struct usb_request *req) 429 { 430 u16 w_value = le16_to_cpu(ctrl->wValue); 431 u16 len = le16_to_cpu(ctrl->wLength); 432 int value = 0; 433 434 switch (ctrl->bRequest) { 435 case USB_REQ_DFU_DNLOAD: 436 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC; 437 f_dfu->blk_seq_num = w_value; 438 value = handle_dnload(gadget, len); 439 break; 440 case USB_REQ_DFU_ABORT: 441 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 442 value = RET_ZLP; 443 break; 444 case USB_REQ_DFU_GETSTATUS: 445 handle_getstatus(req); 446 value = RET_STAT_LEN; 447 break; 448 case USB_REQ_DFU_GETSTATE: 449 handle_getstate(req); 450 break; 451 default: 452 f_dfu->dfu_state = DFU_STATE_dfuERROR; 453 value = RET_STALL; 454 break; 455 } 456 457 return value; 458 } 459 460 static int state_dfu_manifest_sync(struct f_dfu *f_dfu, 461 const struct usb_ctrlrequest *ctrl, 462 struct usb_gadget *gadget, 463 struct usb_request *req) 464 { 465 int value = 0; 466 467 switch (ctrl->bRequest) { 468 case USB_REQ_DFU_GETSTATUS: 469 /* We're MainfestationTolerant */ 470 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST; 471 handle_getstatus(req); 472 f_dfu->blk_seq_num = 0; 473 value = RET_STAT_LEN; 474 req->complete = dnload_request_flush; 475 break; 476 case USB_REQ_DFU_GETSTATE: 477 handle_getstate(req); 478 break; 479 default: 480 f_dfu->dfu_state = DFU_STATE_dfuERROR; 481 value = RET_STALL; 482 break; 483 } 484 485 return value; 486 } 487 488 static int state_dfu_manifest(struct f_dfu *f_dfu, 489 const struct usb_ctrlrequest *ctrl, 490 struct usb_gadget *gadget, 491 struct usb_request *req) 492 { 493 int value = 0; 494 495 switch (ctrl->bRequest) { 496 case USB_REQ_DFU_GETSTATUS: 497 /* We're MainfestationTolerant */ 498 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 499 handle_getstatus(req); 500 f_dfu->blk_seq_num = 0; 501 value = RET_STAT_LEN; 502 puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n"); 503 break; 504 case USB_REQ_DFU_GETSTATE: 505 handle_getstate(req); 506 break; 507 default: 508 f_dfu->dfu_state = DFU_STATE_dfuERROR; 509 value = RET_STALL; 510 break; 511 } 512 return value; 513 } 514 515 static int state_dfu_upload_idle(struct f_dfu *f_dfu, 516 const struct usb_ctrlrequest *ctrl, 517 struct usb_gadget *gadget, 518 struct usb_request *req) 519 { 520 u16 w_value = le16_to_cpu(ctrl->wValue); 521 u16 len = le16_to_cpu(ctrl->wLength); 522 int value = 0; 523 524 switch (ctrl->bRequest) { 525 case USB_REQ_DFU_UPLOAD: 526 /* state transition if less data then requested */ 527 f_dfu->blk_seq_num = w_value; 528 value = handle_upload(req, len); 529 if (value >= 0 && value < len) 530 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 531 break; 532 case USB_REQ_DFU_ABORT: 533 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 534 /* no zlp? */ 535 value = RET_ZLP; 536 break; 537 case USB_REQ_DFU_GETSTATUS: 538 handle_getstatus(req); 539 value = RET_STAT_LEN; 540 break; 541 case USB_REQ_DFU_GETSTATE: 542 handle_getstate(req); 543 break; 544 default: 545 f_dfu->dfu_state = DFU_STATE_dfuERROR; 546 value = RET_STALL; 547 break; 548 } 549 550 return value; 551 } 552 553 static int state_dfu_error(struct f_dfu *f_dfu, 554 const struct usb_ctrlrequest *ctrl, 555 struct usb_gadget *gadget, 556 struct usb_request *req) 557 { 558 int value = 0; 559 560 switch (ctrl->bRequest) { 561 case USB_REQ_DFU_GETSTATUS: 562 handle_getstatus(req); 563 value = RET_STAT_LEN; 564 break; 565 case USB_REQ_DFU_GETSTATE: 566 handle_getstate(req); 567 break; 568 case USB_REQ_DFU_CLRSTATUS: 569 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 570 f_dfu->dfu_status = DFU_STATUS_OK; 571 /* no zlp? */ 572 value = RET_ZLP; 573 break; 574 default: 575 f_dfu->dfu_state = DFU_STATE_dfuERROR; 576 value = RET_STALL; 577 break; 578 } 579 580 return value; 581 } 582 583 static dfu_state_fn dfu_state[] = { 584 state_app_idle, /* DFU_STATE_appIDLE */ 585 state_app_detach, /* DFU_STATE_appDETACH */ 586 state_dfu_idle, /* DFU_STATE_dfuIDLE */ 587 state_dfu_dnload_sync, /* DFU_STATE_dfuDNLOAD_SYNC */ 588 state_dfu_dnbusy, /* DFU_STATE_dfuDNBUSY */ 589 state_dfu_dnload_idle, /* DFU_STATE_dfuDNLOAD_IDLE */ 590 state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */ 591 state_dfu_manifest, /* DFU_STATE_dfuMANIFEST */ 592 NULL, /* DFU_STATE_dfuMANIFEST_WAIT_RST */ 593 state_dfu_upload_idle, /* DFU_STATE_dfuUPLOAD_IDLE */ 594 state_dfu_error /* DFU_STATE_dfuERROR */ 595 }; 596 597 static int 598 dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 599 { 600 struct usb_gadget *gadget = f->config->cdev->gadget; 601 struct usb_request *req = f->config->cdev->req; 602 struct f_dfu *f_dfu = f->config->cdev->req->context; 603 u16 len = le16_to_cpu(ctrl->wLength); 604 u16 w_value = le16_to_cpu(ctrl->wValue); 605 int value = 0; 606 u8 req_type = ctrl->bRequestType & USB_TYPE_MASK; 607 608 debug("w_value: 0x%x len: 0x%x\n", w_value, len); 609 debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n", 610 req_type, ctrl->bRequest, f_dfu->dfu_state); 611 612 if (req_type == USB_TYPE_STANDARD) { 613 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR && 614 (w_value >> 8) == DFU_DT_FUNC) { 615 value = min(len, (u16) sizeof(dfu_func)); 616 memcpy(req->buf, &dfu_func, value); 617 } 618 } else /* DFU specific request */ 619 value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req); 620 621 if (value >= 0) { 622 req->length = value; 623 req->zero = value < len; 624 value = usb_ep_queue(gadget->ep0, req, 0); 625 if (value < 0) { 626 debug("ep_queue --> %d\n", value); 627 req->status = 0; 628 } 629 } 630 631 return value; 632 } 633 634 /*-------------------------------------------------------------------------*/ 635 636 static int 637 dfu_prepare_strings(struct f_dfu *f_dfu, int n) 638 { 639 struct dfu_entity *de = NULL; 640 int i = 0; 641 642 f_dfu->strings = calloc(sizeof(struct usb_string), n + 1); 643 if (!f_dfu->strings) 644 goto enomem; 645 646 for (i = 0; i < n; ++i) { 647 de = dfu_get_entity(i); 648 f_dfu->strings[i].s = de->name; 649 } 650 651 f_dfu->strings[i].id = 0; 652 f_dfu->strings[i].s = NULL; 653 654 return 0; 655 656 enomem: 657 while (i) 658 f_dfu->strings[--i].s = NULL; 659 660 free(f_dfu->strings); 661 662 return -ENOMEM; 663 } 664 665 static int dfu_prepare_function(struct f_dfu *f_dfu, int n) 666 { 667 struct usb_interface_descriptor *d; 668 int i = 0; 669 670 f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n + 1); 671 if (!f_dfu->function) 672 goto enomem; 673 674 for (i = 0; i < n; ++i) { 675 d = calloc(sizeof(*d), 1); 676 if (!d) 677 goto enomem; 678 679 d->bLength = sizeof(*d); 680 d->bDescriptorType = USB_DT_INTERFACE; 681 d->bAlternateSetting = i; 682 d->bNumEndpoints = 0; 683 d->bInterfaceClass = USB_CLASS_APP_SPEC; 684 d->bInterfaceSubClass = 1; 685 d->bInterfaceProtocol = 2; 686 687 f_dfu->function[i] = (struct usb_descriptor_header *)d; 688 } 689 f_dfu->function[i] = NULL; 690 691 return 0; 692 693 enomem: 694 while (i) { 695 free(f_dfu->function[--i]); 696 f_dfu->function[i] = NULL; 697 } 698 free(f_dfu->function); 699 700 return -ENOMEM; 701 } 702 703 static int dfu_bind(struct usb_configuration *c, struct usb_function *f) 704 { 705 struct usb_composite_dev *cdev = c->cdev; 706 struct f_dfu *f_dfu = func_to_dfu(f); 707 int alt_num = dfu_get_alt_number(); 708 int rv, id, i; 709 710 id = usb_interface_id(c, f); 711 if (id < 0) 712 return id; 713 dfu_intf_runtime.bInterfaceNumber = id; 714 715 f_dfu->dfu_state = DFU_STATE_appIDLE; 716 f_dfu->dfu_status = DFU_STATUS_OK; 717 718 rv = dfu_prepare_function(f_dfu, alt_num); 719 if (rv) 720 goto error; 721 722 rv = dfu_prepare_strings(f_dfu, alt_num); 723 if (rv) 724 goto error; 725 for (i = 0; i < alt_num; i++) { 726 id = usb_string_id(cdev); 727 if (id < 0) 728 return id; 729 f_dfu->strings[i].id = id; 730 ((struct usb_interface_descriptor *)f_dfu->function[i]) 731 ->iInterface = id; 732 } 733 734 to_dfu_mode(f_dfu); 735 736 stringtab_dfu.strings = f_dfu->strings; 737 738 cdev->req->context = f_dfu; 739 740 error: 741 return rv; 742 } 743 744 static void dfu_unbind(struct usb_configuration *c, struct usb_function *f) 745 { 746 struct f_dfu *f_dfu = func_to_dfu(f); 747 int alt_num = dfu_get_alt_number(); 748 int i; 749 750 if (f_dfu->strings) { 751 i = alt_num; 752 while (i) 753 f_dfu->strings[--i].s = NULL; 754 755 free(f_dfu->strings); 756 } 757 758 if (f_dfu->function) { 759 i = alt_num; 760 while (i) { 761 free(f_dfu->function[--i]); 762 f_dfu->function[i] = NULL; 763 } 764 free(f_dfu->function); 765 } 766 767 free(f_dfu); 768 } 769 770 static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 771 { 772 struct f_dfu *f_dfu = func_to_dfu(f); 773 774 debug("%s: intf:%d alt:%d\n", __func__, intf, alt); 775 776 f_dfu->altsetting = alt; 777 f_dfu->dfu_state = DFU_STATE_dfuIDLE; 778 f_dfu->dfu_status = DFU_STATUS_OK; 779 780 return 0; 781 } 782 783 static int __dfu_get_alt(struct usb_function *f, unsigned intf) 784 { 785 struct f_dfu *f_dfu = func_to_dfu(f); 786 787 return f_dfu->altsetting; 788 } 789 790 /* TODO: is this really what we need here? */ 791 static void dfu_disable(struct usb_function *f) 792 { 793 struct f_dfu *f_dfu = func_to_dfu(f); 794 if (f_dfu->config == 0) 795 return; 796 797 debug("%s: reset config\n", __func__); 798 799 f_dfu->config = 0; 800 } 801 802 static int dfu_bind_config(struct usb_configuration *c) 803 { 804 struct f_dfu *f_dfu; 805 int status; 806 807 f_dfu = calloc(sizeof(*f_dfu), 1); 808 if (!f_dfu) 809 return -ENOMEM; 810 f_dfu->usb_function.name = "dfu"; 811 f_dfu->usb_function.hs_descriptors = dfu_runtime_descs; 812 f_dfu->usb_function.descriptors = dfu_runtime_descs; 813 f_dfu->usb_function.bind = dfu_bind; 814 f_dfu->usb_function.unbind = dfu_unbind; 815 f_dfu->usb_function.set_alt = dfu_set_alt; 816 f_dfu->usb_function.get_alt = __dfu_get_alt; 817 f_dfu->usb_function.disable = dfu_disable; 818 f_dfu->usb_function.strings = dfu_generic_strings; 819 f_dfu->usb_function.setup = dfu_handle; 820 f_dfu->poll_timeout = DFU_DEFAULT_POLL_TIMEOUT; 821 822 status = usb_add_function(c, &f_dfu->usb_function); 823 if (status) 824 free(f_dfu); 825 826 return status; 827 } 828 829 int dfu_add(struct usb_configuration *c) 830 { 831 int id; 832 833 id = usb_string_id(c->cdev); 834 if (id < 0) 835 return id; 836 strings_dfu_generic[0].id = id; 837 dfu_intf_runtime.iInterface = id; 838 839 debug("%s: cdev: 0x%p gadget:0x%p gadget->ep0: 0x%p\n", __func__, 840 c->cdev, c->cdev->gadget, c->cdev->gadget->ep0); 841 842 return dfu_bind_config(c); 843 } 844 845 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_dfu, dfu_add); 846