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