drivers/usb/gadget/f_fastboot.c

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