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