1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2008 - 2009 4 * Windriver, <www.windriver.com> 5 * Tom Rix <Tom.Rix@windriver.com> 6 * 7 * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de> 8 * 9 * Copyright 2014 Linaro, Ltd. 10 * Rob Herring <robh@kernel.org> 11 */ 12 #include <config.h> 13 #include <common.h> 14 #include <errno.h> 15 #include <fastboot.h> 16 #include <malloc.h> 17 #include <linux/usb/ch9.h> 18 #include <linux/usb/gadget.h> 19 #include <linux/usb/composite.h> 20 #include <linux/compiler.h> 21 #include <version.h> 22 #include <g_dnl.h> 23 #ifdef CONFIG_FASTBOOT_FLASH_MMC 24 #include <fb_mmc.h> 25 #endif 26 #ifdef CONFIG_FASTBOOT_FLASH_NAND 27 #include <fb_nand.h> 28 #endif 29 30 #define FASTBOOT_VERSION "0.4" 31 32 #define FASTBOOT_INTERFACE_CLASS 0xff 33 #define FASTBOOT_INTERFACE_SUB_CLASS 0x42 34 #define FASTBOOT_INTERFACE_PROTOCOL 0x03 35 36 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0 (0x0200) 37 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1 (0x0040) 38 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE (0x0040) 39 40 #define EP_BUFFER_SIZE 4096 41 /* 42 * EP_BUFFER_SIZE must always be an integral multiple of maxpacket size 43 * (64 or 512 or 1024), else we break on certain controllers like DWC3 44 * that expect bulk OUT requests to be divisible by maxpacket size. 45 */ 46 47 struct f_fastboot { 48 struct usb_function usb_function; 49 50 /* IN/OUT EP's and corresponding requests */ 51 struct usb_ep *in_ep, *out_ep; 52 struct usb_request *in_req, *out_req; 53 }; 54 55 static inline struct f_fastboot *func_to_fastboot(struct usb_function *f) 56 { 57 return container_of(f, struct f_fastboot, usb_function); 58 } 59 60 static struct f_fastboot *fastboot_func; 61 static unsigned int download_size; 62 static unsigned int download_bytes; 63 64 static struct usb_endpoint_descriptor fs_ep_in = { 65 .bLength = USB_DT_ENDPOINT_SIZE, 66 .bDescriptorType = USB_DT_ENDPOINT, 67 .bEndpointAddress = USB_DIR_IN, 68 .bmAttributes = USB_ENDPOINT_XFER_BULK, 69 .wMaxPacketSize = cpu_to_le16(64), 70 }; 71 72 static struct usb_endpoint_descriptor fs_ep_out = { 73 .bLength = USB_DT_ENDPOINT_SIZE, 74 .bDescriptorType = USB_DT_ENDPOINT, 75 .bEndpointAddress = USB_DIR_OUT, 76 .bmAttributes = USB_ENDPOINT_XFER_BULK, 77 .wMaxPacketSize = cpu_to_le16(64), 78 }; 79 80 static struct usb_endpoint_descriptor hs_ep_in = { 81 .bLength = USB_DT_ENDPOINT_SIZE, 82 .bDescriptorType = USB_DT_ENDPOINT, 83 .bEndpointAddress = USB_DIR_IN, 84 .bmAttributes = USB_ENDPOINT_XFER_BULK, 85 .wMaxPacketSize = cpu_to_le16(512), 86 }; 87 88 static struct usb_endpoint_descriptor hs_ep_out = { 89 .bLength = USB_DT_ENDPOINT_SIZE, 90 .bDescriptorType = USB_DT_ENDPOINT, 91 .bEndpointAddress = USB_DIR_OUT, 92 .bmAttributes = USB_ENDPOINT_XFER_BULK, 93 .wMaxPacketSize = cpu_to_le16(512), 94 }; 95 96 static struct usb_interface_descriptor interface_desc = { 97 .bLength = USB_DT_INTERFACE_SIZE, 98 .bDescriptorType = USB_DT_INTERFACE, 99 .bInterfaceNumber = 0x00, 100 .bAlternateSetting = 0x00, 101 .bNumEndpoints = 0x02, 102 .bInterfaceClass = FASTBOOT_INTERFACE_CLASS, 103 .bInterfaceSubClass = FASTBOOT_INTERFACE_SUB_CLASS, 104 .bInterfaceProtocol = FASTBOOT_INTERFACE_PROTOCOL, 105 }; 106 107 static struct usb_descriptor_header *fb_fs_function[] = { 108 (struct usb_descriptor_header *)&interface_desc, 109 (struct usb_descriptor_header *)&fs_ep_in, 110 (struct usb_descriptor_header *)&fs_ep_out, 111 }; 112 113 static struct usb_descriptor_header *fb_hs_function[] = { 114 (struct usb_descriptor_header *)&interface_desc, 115 (struct usb_descriptor_header *)&hs_ep_in, 116 (struct usb_descriptor_header *)&hs_ep_out, 117 NULL, 118 }; 119 120 static struct usb_endpoint_descriptor * 121 fb_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, 122 struct usb_endpoint_descriptor *hs) 123 { 124 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) 125 return hs; 126 return fs; 127 } 128 129 /* 130 * static strings, in UTF-8 131 */ 132 static const char fastboot_name[] = "Android Fastboot"; 133 134 static struct usb_string fastboot_string_defs[] = { 135 [0].s = fastboot_name, 136 { } /* end of list */ 137 }; 138 139 static struct usb_gadget_strings stringtab_fastboot = { 140 .language = 0x0409, /* en-us */ 141 .strings = fastboot_string_defs, 142 }; 143 144 static struct usb_gadget_strings *fastboot_strings[] = { 145 &stringtab_fastboot, 146 NULL, 147 }; 148 149 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req); 150 static int strcmp_l1(const char *s1, const char *s2); 151 152 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req) 153 { 154 int status = req->status; 155 if (!status) 156 return; 157 printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual); 158 } 159 160 static int fastboot_bind(struct usb_configuration *c, struct usb_function *f) 161 { 162 int id; 163 struct usb_gadget *gadget = c->cdev->gadget; 164 struct f_fastboot *f_fb = func_to_fastboot(f); 165 const char *s; 166 167 /* DYNAMIC interface numbers assignments */ 168 id = usb_interface_id(c, f); 169 if (id < 0) 170 return id; 171 interface_desc.bInterfaceNumber = id; 172 173 id = usb_string_id(c->cdev); 174 if (id < 0) 175 return id; 176 fastboot_string_defs[0].id = id; 177 interface_desc.iInterface = id; 178 179 f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in); 180 if (!f_fb->in_ep) 181 return -ENODEV; 182 f_fb->in_ep->driver_data = c->cdev; 183 184 f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out); 185 if (!f_fb->out_ep) 186 return -ENODEV; 187 f_fb->out_ep->driver_data = c->cdev; 188 189 f->descriptors = fb_fs_function; 190 191 if (gadget_is_dualspeed(gadget)) { 192 /* Assume endpoint addresses are the same for both speeds */ 193 hs_ep_in.bEndpointAddress = fs_ep_in.bEndpointAddress; 194 hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress; 195 /* copy HS descriptors */ 196 f->hs_descriptors = fb_hs_function; 197 } 198 199 s = env_get("serial#"); 200 if (s) 201 g_dnl_set_serialnumber((char *)s); 202 203 return 0; 204 } 205 206 static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f) 207 { 208 memset(fastboot_func, 0, sizeof(*fastboot_func)); 209 } 210 211 static void fastboot_disable(struct usb_function *f) 212 { 213 struct f_fastboot *f_fb = func_to_fastboot(f); 214 215 usb_ep_disable(f_fb->out_ep); 216 usb_ep_disable(f_fb->in_ep); 217 218 if (f_fb->out_req) { 219 free(f_fb->out_req->buf); 220 usb_ep_free_request(f_fb->out_ep, f_fb->out_req); 221 f_fb->out_req = NULL; 222 } 223 if (f_fb->in_req) { 224 free(f_fb->in_req->buf); 225 usb_ep_free_request(f_fb->in_ep, f_fb->in_req); 226 f_fb->in_req = NULL; 227 } 228 } 229 230 static struct usb_request *fastboot_start_ep(struct usb_ep *ep) 231 { 232 struct usb_request *req; 233 234 req = usb_ep_alloc_request(ep, 0); 235 if (!req) 236 return NULL; 237 238 req->length = EP_BUFFER_SIZE; 239 req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE); 240 if (!req->buf) { 241 usb_ep_free_request(ep, req); 242 return NULL; 243 } 244 245 memset(req->buf, 0, req->length); 246 return req; 247 } 248 249 static int fastboot_set_alt(struct usb_function *f, 250 unsigned interface, unsigned alt) 251 { 252 int ret; 253 struct usb_composite_dev *cdev = f->config->cdev; 254 struct usb_gadget *gadget = cdev->gadget; 255 struct f_fastboot *f_fb = func_to_fastboot(f); 256 const struct usb_endpoint_descriptor *d; 257 258 debug("%s: func: %s intf: %d alt: %d\n", 259 __func__, f->name, interface, alt); 260 261 d = fb_ep_desc(gadget, &fs_ep_out, &hs_ep_out); 262 ret = usb_ep_enable(f_fb->out_ep, d); 263 if (ret) { 264 puts("failed to enable out ep\n"); 265 return ret; 266 } 267 268 f_fb->out_req = fastboot_start_ep(f_fb->out_ep); 269 if (!f_fb->out_req) { 270 puts("failed to alloc out req\n"); 271 ret = -EINVAL; 272 goto err; 273 } 274 f_fb->out_req->complete = rx_handler_command; 275 276 d = fb_ep_desc(gadget, &fs_ep_in, &hs_ep_in); 277 ret = usb_ep_enable(f_fb->in_ep, d); 278 if (ret) { 279 puts("failed to enable in ep\n"); 280 goto err; 281 } 282 283 f_fb->in_req = fastboot_start_ep(f_fb->in_ep); 284 if (!f_fb->in_req) { 285 puts("failed alloc req in\n"); 286 ret = -EINVAL; 287 goto err; 288 } 289 f_fb->in_req->complete = fastboot_complete; 290 291 ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0); 292 if (ret) 293 goto err; 294 295 return 0; 296 err: 297 fastboot_disable(f); 298 return ret; 299 } 300 301 static int fastboot_add(struct usb_configuration *c) 302 { 303 struct f_fastboot *f_fb = fastboot_func; 304 int status; 305 306 debug("%s: cdev: 0x%p\n", __func__, c->cdev); 307 308 if (!f_fb) { 309 f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb)); 310 if (!f_fb) 311 return -ENOMEM; 312 313 fastboot_func = f_fb; 314 memset(f_fb, 0, sizeof(*f_fb)); 315 } 316 317 f_fb->usb_function.name = "f_fastboot"; 318 f_fb->usb_function.bind = fastboot_bind; 319 f_fb->usb_function.unbind = fastboot_unbind; 320 f_fb->usb_function.set_alt = fastboot_set_alt; 321 f_fb->usb_function.disable = fastboot_disable; 322 f_fb->usb_function.strings = fastboot_strings; 323 324 status = usb_add_function(c, &f_fb->usb_function); 325 if (status) { 326 free(f_fb); 327 fastboot_func = f_fb; 328 } 329 330 return status; 331 } 332 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add); 333 334 static int fastboot_tx_write(const char *buffer, unsigned int buffer_size) 335 { 336 struct usb_request *in_req = fastboot_func->in_req; 337 int ret; 338 339 memcpy(in_req->buf, buffer, buffer_size); 340 in_req->length = buffer_size; 341 342 usb_ep_dequeue(fastboot_func->in_ep, in_req); 343 344 ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0); 345 if (ret) 346 printf("Error %d on queue\n", ret); 347 return 0; 348 } 349 350 static int fastboot_tx_write_str(const char *buffer) 351 { 352 return fastboot_tx_write(buffer, strlen(buffer)); 353 } 354 355 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req) 356 { 357 do_reset(NULL, 0, 0, NULL); 358 } 359 360 static void cb_reboot(struct usb_ep *ep, struct usb_request *req) 361 { 362 char *cmd = req->buf; 363 if (!strcmp_l1("reboot-bootloader", cmd)) { 364 if (fastboot_set_reboot_flag()) { 365 fastboot_tx_write_str("FAILCannot set reboot flag"); 366 return; 367 } 368 } 369 fastboot_func->in_req->complete = compl_do_reset; 370 fastboot_tx_write_str("OKAY"); 371 } 372 373 static int strcmp_l1(const char *s1, const char *s2) 374 { 375 if (!s1 || !s2) 376 return -1; 377 return strncmp(s1, s2, strlen(s1)); 378 } 379 380 static void cb_getvar(struct usb_ep *ep, struct usb_request *req) 381 { 382 char *cmd = req->buf; 383 char response[FASTBOOT_RESPONSE_LEN]; 384 const char *s; 385 size_t chars_left; 386 387 strcpy(response, "OKAY"); 388 chars_left = sizeof(response) - strlen(response) - 1; 389 390 strsep(&cmd, ":"); 391 if (!cmd) { 392 pr_err("missing variable"); 393 fastboot_tx_write_str("FAILmissing var"); 394 return; 395 } 396 397 if (!strcmp_l1("version", cmd)) { 398 strncat(response, FASTBOOT_VERSION, chars_left); 399 } else if (!strcmp_l1("bootloader-version", cmd)) { 400 strncat(response, U_BOOT_VERSION, chars_left); 401 } else if (!strcmp_l1("downloadsize", cmd) || 402 !strcmp_l1("max-download-size", cmd)) { 403 char str_num[12]; 404 405 sprintf(str_num, "0x%08x", CONFIG_FASTBOOT_BUF_SIZE); 406 strncat(response, str_num, chars_left); 407 } else if (!strcmp_l1("serialno", cmd)) { 408 s = env_get("serial#"); 409 if (s) 410 strncat(response, s, chars_left); 411 else 412 strcpy(response, "FAILValue not set"); 413 } else { 414 char *envstr; 415 416 envstr = malloc(strlen("fastboot.") + strlen(cmd) + 1); 417 if (!envstr) { 418 fastboot_tx_write_str("FAILmalloc error"); 419 return; 420 } 421 422 sprintf(envstr, "fastboot.%s", cmd); 423 s = env_get(envstr); 424 if (s) { 425 strncat(response, s, chars_left); 426 } else { 427 printf("WARNING: unknown variable: %s\n", cmd); 428 strcpy(response, "FAILVariable not implemented"); 429 } 430 431 free(envstr); 432 } 433 fastboot_tx_write_str(response); 434 } 435 436 static unsigned int rx_bytes_expected(struct usb_ep *ep) 437 { 438 int rx_remain = download_size - download_bytes; 439 unsigned int rem; 440 unsigned int maxpacket = ep->maxpacket; 441 442 if (rx_remain <= 0) 443 return 0; 444 else if (rx_remain > EP_BUFFER_SIZE) 445 return EP_BUFFER_SIZE; 446 447 /* 448 * Some controllers e.g. DWC3 don't like OUT transfers to be 449 * not ending in maxpacket boundary. So just make them happy by 450 * always requesting for integral multiple of maxpackets. 451 * This shouldn't bother controllers that don't care about it. 452 */ 453 rem = rx_remain % maxpacket; 454 if (rem > 0) 455 rx_remain = rx_remain + (maxpacket - rem); 456 457 return rx_remain; 458 } 459 460 #define BYTES_PER_DOT 0x20000 461 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req) 462 { 463 char response[FASTBOOT_RESPONSE_LEN]; 464 unsigned int transfer_size = download_size - download_bytes; 465 const unsigned char *buffer = req->buf; 466 unsigned int buffer_size = req->actual; 467 unsigned int pre_dot_num, now_dot_num; 468 469 if (req->status != 0) { 470 printf("Bad status: %d\n", req->status); 471 return; 472 } 473 474 if (buffer_size < transfer_size) 475 transfer_size = buffer_size; 476 477 memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes, 478 buffer, transfer_size); 479 480 pre_dot_num = download_bytes / BYTES_PER_DOT; 481 download_bytes += transfer_size; 482 now_dot_num = download_bytes / BYTES_PER_DOT; 483 484 if (pre_dot_num != now_dot_num) { 485 putc('.'); 486 if (!(now_dot_num % 74)) 487 putc('\n'); 488 } 489 490 /* Check if transfer is done */ 491 if (download_bytes >= download_size) { 492 /* 493 * Reset global transfer variable, keep download_bytes because 494 * it will be used in the next possible flashing command 495 */ 496 download_size = 0; 497 req->complete = rx_handler_command; 498 req->length = EP_BUFFER_SIZE; 499 500 strcpy(response, "OKAY"); 501 fastboot_tx_write_str(response); 502 503 printf("\ndownloading of %d bytes finished\n", download_bytes); 504 } else { 505 req->length = rx_bytes_expected(ep); 506 } 507 508 req->actual = 0; 509 usb_ep_queue(ep, req, 0); 510 } 511 512 static void cb_download(struct usb_ep *ep, struct usb_request *req) 513 { 514 char *cmd = req->buf; 515 char response[FASTBOOT_RESPONSE_LEN]; 516 517 strsep(&cmd, ":"); 518 download_size = simple_strtoul(cmd, NULL, 16); 519 download_bytes = 0; 520 521 printf("Starting download of %d bytes\n", download_size); 522 523 if (0 == download_size) { 524 strcpy(response, "FAILdata invalid size"); 525 } else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) { 526 download_size = 0; 527 strcpy(response, "FAILdata too large"); 528 } else { 529 sprintf(response, "DATA%08x", download_size); 530 req->complete = rx_handler_dl_image; 531 req->length = rx_bytes_expected(ep); 532 } 533 fastboot_tx_write_str(response); 534 } 535 536 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req) 537 { 538 char boot_addr_start[12]; 539 char *bootm_args[] = { "bootm", boot_addr_start, NULL }; 540 541 puts("Booting kernel..\n"); 542 543 sprintf(boot_addr_start, "0x%lx", (long)CONFIG_FASTBOOT_BUF_ADDR); 544 do_bootm(NULL, 0, 2, bootm_args); 545 546 /* This only happens if image is somehow faulty so we start over */ 547 do_reset(NULL, 0, 0, NULL); 548 } 549 550 static void cb_boot(struct usb_ep *ep, struct usb_request *req) 551 { 552 fastboot_func->in_req->complete = do_bootm_on_complete; 553 fastboot_tx_write_str("OKAY"); 554 } 555 556 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req) 557 { 558 g_dnl_trigger_detach(); 559 } 560 561 static void cb_continue(struct usb_ep *ep, struct usb_request *req) 562 { 563 fastboot_func->in_req->complete = do_exit_on_complete; 564 fastboot_tx_write_str("OKAY"); 565 } 566 567 #ifdef CONFIG_FASTBOOT_FLASH 568 static void cb_flash(struct usb_ep *ep, struct usb_request *req) 569 { 570 char *cmd = req->buf; 571 char response[FASTBOOT_RESPONSE_LEN]; 572 573 strsep(&cmd, ":"); 574 if (!cmd) { 575 pr_err("missing partition name"); 576 fastboot_tx_write_str("FAILmissing partition name"); 577 return; 578 } 579 580 fastboot_fail("no flash device defined", response); 581 #ifdef CONFIG_FASTBOOT_FLASH_MMC 582 fb_mmc_flash_write(cmd, (void *)CONFIG_FASTBOOT_BUF_ADDR, 583 download_bytes, response); 584 #endif 585 #ifdef CONFIG_FASTBOOT_FLASH_NAND 586 fb_nand_flash_write(cmd, (void *)CONFIG_FASTBOOT_BUF_ADDR, 587 download_bytes, response); 588 #endif 589 fastboot_tx_write_str(response); 590 } 591 #endif 592 593 static void cb_oem(struct usb_ep *ep, struct usb_request *req) 594 { 595 char *cmd = req->buf; 596 #ifdef CONFIG_FASTBOOT_FLASH_MMC 597 if (strncmp("format", cmd + 4, 6) == 0) { 598 char cmdbuf[32]; 599 sprintf(cmdbuf, "gpt write mmc %x $partitions", 600 CONFIG_FASTBOOT_FLASH_MMC_DEV); 601 if (run_command(cmdbuf, 0)) 602 fastboot_tx_write_str("FAIL"); 603 else 604 fastboot_tx_write_str("OKAY"); 605 } else 606 #endif 607 if (strncmp("unlock", cmd + 4, 8) == 0) { 608 fastboot_tx_write_str("FAILnot implemented"); 609 } 610 else { 611 fastboot_tx_write_str("FAILunknown oem command"); 612 } 613 } 614 615 #ifdef CONFIG_FASTBOOT_FLASH 616 static void cb_erase(struct usb_ep *ep, struct usb_request *req) 617 { 618 char *cmd = req->buf; 619 char response[FASTBOOT_RESPONSE_LEN]; 620 621 strsep(&cmd, ":"); 622 if (!cmd) { 623 pr_err("missing partition name"); 624 fastboot_tx_write_str("FAILmissing partition name"); 625 return; 626 } 627 628 fastboot_fail("no flash device defined", response); 629 #ifdef CONFIG_FASTBOOT_FLASH_MMC 630 fb_mmc_erase(cmd, response); 631 #endif 632 #ifdef CONFIG_FASTBOOT_FLASH_NAND 633 fb_nand_erase(cmd, response); 634 #endif 635 fastboot_tx_write_str(response); 636 } 637 #endif 638 639 struct cmd_dispatch_info { 640 char *cmd; 641 void (*cb)(struct usb_ep *ep, struct usb_request *req); 642 }; 643 644 static const struct cmd_dispatch_info cmd_dispatch_info[] = { 645 { 646 .cmd = "reboot", 647 .cb = cb_reboot, 648 }, { 649 .cmd = "getvar:", 650 .cb = cb_getvar, 651 }, { 652 .cmd = "download:", 653 .cb = cb_download, 654 }, { 655 .cmd = "boot", 656 .cb = cb_boot, 657 }, { 658 .cmd = "continue", 659 .cb = cb_continue, 660 }, 661 #ifdef CONFIG_FASTBOOT_FLASH 662 { 663 .cmd = "flash", 664 .cb = cb_flash, 665 }, { 666 .cmd = "erase", 667 .cb = cb_erase, 668 }, 669 #endif 670 { 671 .cmd = "oem", 672 .cb = cb_oem, 673 }, 674 }; 675 676 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req) 677 { 678 char *cmdbuf = req->buf; 679 void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL; 680 int i; 681 682 if (req->status != 0 || req->length == 0) 683 return; 684 685 for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) { 686 if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) { 687 func_cb = cmd_dispatch_info[i].cb; 688 break; 689 } 690 } 691 692 if (!func_cb) { 693 pr_err("unknown command: %.*s", req->actual, cmdbuf); 694 fastboot_tx_write_str("FAILunknown command"); 695 } else { 696 if (req->actual < req->length) { 697 u8 *buf = (u8 *)req->buf; 698 buf[req->actual] = 0; 699 func_cb(ep, req); 700 } else { 701 pr_err("buffer overflow"); 702 fastboot_tx_write_str("FAILbuffer overflow"); 703 } 704 } 705 706 *cmdbuf = '\0'; 707 req->actual = 0; 708 usb_ep_queue(ep, req, 0); 709 } 710