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 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
  28 #include <fb_nand.h>
  29 #endif
  30
  31 #define FASTBOOT_VERSION                "0.4"
  32
  33 #define FASTBOOT_INTERFACE_CLASS        0xff
  34 #define FASTBOOT_INTERFACE_SUB_CLASS    0x42
  35 #define FASTBOOT_INTERFACE_PROTOCOL     0x03
  36
  37 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  (0x0200)
  38 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
  39 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)
  40
  41 #define EP_BUFFER_SIZE                  4096
  42 /*
  43  * EP_BUFFER_SIZE must always be an integral multiple of maxpacket size
  44  * (64 or 512 or 1024), else we break on certain controllers like DWC3
  45  * that expect bulk OUT requests to be divisible by maxpacket size.
  46  */
  47
  48 struct f_fastboot {
  49         struct usb_function usb_function;
  50
  51         /* IN/OUT EP's and corresponding requests */
  52         struct usb_ep *in_ep, *out_ep;
  53         struct usb_request *in_req, *out_req;
  54 };
  55
  56 static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
  57 {
  58         return container_of(f, struct f_fastboot, usb_function);
  59 }
  60
  61 static struct f_fastboot *fastboot_func;
  62 static unsigned int download_size;
  63 static unsigned int download_bytes;
  64
  65 static struct usb_endpoint_descriptor fs_ep_in = {
  66         .bLength            = USB_DT_ENDPOINT_SIZE,
  67         .bDescriptorType    = USB_DT_ENDPOINT,
  68         .bEndpointAddress   = USB_DIR_IN,
  69         .bmAttributes       = USB_ENDPOINT_XFER_BULK,
  70         .wMaxPacketSize     = cpu_to_le16(64),
  71 };
  72
  73 static struct usb_endpoint_descriptor fs_ep_out = {
  74         .bLength                = USB_DT_ENDPOINT_SIZE,
  75         .bDescriptorType        = USB_DT_ENDPOINT,
  76         .bEndpointAddress       = USB_DIR_OUT,
  77         .bmAttributes           = USB_ENDPOINT_XFER_BULK,
  78         .wMaxPacketSize         = cpu_to_le16(64),
  79 };
  80
  81 static struct usb_endpoint_descriptor hs_ep_in = {
  82         .bLength                = USB_DT_ENDPOINT_SIZE,
  83         .bDescriptorType        = USB_DT_ENDPOINT,
  84         .bEndpointAddress       = USB_DIR_IN,
  85         .bmAttributes           = USB_ENDPOINT_XFER_BULK,
  86         .wMaxPacketSize         = cpu_to_le16(512),
  87 };
  88
  89 static struct usb_endpoint_descriptor hs_ep_out = {
  90         .bLength                = USB_DT_ENDPOINT_SIZE,
  91         .bDescriptorType        = USB_DT_ENDPOINT,
  92         .bEndpointAddress       = USB_DIR_OUT,
  93         .bmAttributes           = USB_ENDPOINT_XFER_BULK,
  94         .wMaxPacketSize         = cpu_to_le16(512),
  95 };
  96
  97 static struct usb_interface_descriptor interface_desc = {
  98         .bLength                = USB_DT_INTERFACE_SIZE,
  99         .bDescriptorType        = USB_DT_INTERFACE,
 100         .bInterfaceNumber       = 0x00,
 101         .bAlternateSetting      = 0x00,
 102         .bNumEndpoints          = 0x02,
 103         .bInterfaceClass        = FASTBOOT_INTERFACE_CLASS,
 104         .bInterfaceSubClass     = FASTBOOT_INTERFACE_SUB_CLASS,
 105         .bInterfaceProtocol     = FASTBOOT_INTERFACE_PROTOCOL,
 106 };
 107
 108 static struct usb_descriptor_header *fb_fs_function[] = {
 109         (struct usb_descriptor_header *)&interface_desc,
 110         (struct usb_descriptor_header *)&fs_ep_in,
 111         (struct usb_descriptor_header *)&fs_ep_out,
 112 };
 113
 114 static struct usb_descriptor_header *fb_hs_function[] = {
 115         (struct usb_descriptor_header *)&interface_desc,
 116         (struct usb_descriptor_header *)&hs_ep_in,
 117         (struct usb_descriptor_header *)&hs_ep_out,
 118         NULL,
 119 };
 120
 121 static struct usb_endpoint_descriptor *
 122 fb_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
 123             struct usb_endpoint_descriptor *hs)
 124 {
 125         if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
 126                 return hs;
 127         return fs;
 128 }
 129
 130 /*
 131  * static strings, in UTF-8
 132  */
 133 static const char fastboot_name[] = "Android Fastboot";
 134
 135 static struct usb_string fastboot_string_defs[] = {
 136         [0].s = fastboot_name,
 137         {  }                    /* end of list */
 138 };
 139
 140 static struct usb_gadget_strings stringtab_fastboot = {
 141         .language       = 0x0409,       /* en-us */
 142         .strings        = fastboot_string_defs,
 143 };
 144
 145 static struct usb_gadget_strings *fastboot_strings[] = {
 146         &stringtab_fastboot,
 147         NULL,
 148 };
 149
 150 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
 151 static int strcmp_l1(const char *s1, const char *s2);
 152
 153
 154 static char *fb_response_str;
 155
 156 void fastboot_fail(const char *reason)
 157 {
 158         strncpy(fb_response_str, "FAIL\0", 5);
 159         strncat(fb_response_str, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
 160 }
 161
 162 void fastboot_okay(const char *reason)
 163 {
 164         strncpy(fb_response_str, "OKAY\0", 5);
 165         strncat(fb_response_str, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
 166 }
 167
 168 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
 169 {
 170         int status = req->status;
 171         if (!status)
 172                 return;
 173         printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
 174 }
 175
 176 static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
 177 {
 178         int id;
 179         struct usb_gadget *gadget = c->cdev->gadget;
 180         struct f_fastboot *f_fb = func_to_fastboot(f);
 181         const char *s;
 182
 183         /* DYNAMIC interface numbers assignments */
 184         id = usb_interface_id(c, f);
 185         if (id < 0)
 186                 return id;
 187         interface_desc.bInterfaceNumber = id;
 188
 189         id = usb_string_id(c->cdev);
 190         if (id < 0)
 191                 return id;
 192         fastboot_string_defs[0].id = id;
 193         interface_desc.iInterface = id;
 194
 195         f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
 196         if (!f_fb->in_ep)
 197                 return -ENODEV;
 198         f_fb->in_ep->driver_data = c->cdev;
 199
 200         f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
 201         if (!f_fb->out_ep)
 202                 return -ENODEV;
 203         f_fb->out_ep->driver_data = c->cdev;
 204
 205         f->descriptors = fb_fs_function;
 206
 207         if (gadget_is_dualspeed(gadget)) {
 208                 /* Assume endpoint addresses are the same for both speeds */
 209                 hs_ep_in.bEndpointAddress = fs_ep_in.bEndpointAddress;
 210                 hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;
 211                 /* copy HS descriptors */
 212                 f->hs_descriptors = fb_hs_function;
 213         }
 214
 215         s = env_get("serial#");
 216         if (s)
 217                 g_dnl_set_serialnumber((char *)s);
 218
 219         return 0;
 220 }
 221
 222 static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
 223 {
 224         memset(fastboot_func, 0, sizeof(*fastboot_func));
 225 }
 226
 227 static void fastboot_disable(struct usb_function *f)
 228 {
 229         struct f_fastboot *f_fb = func_to_fastboot(f);
 230
 231         usb_ep_disable(f_fb->out_ep);
 232         usb_ep_disable(f_fb->in_ep);
 233
 234         if (f_fb->out_req) {
 235                 free(f_fb->out_req->buf);
 236                 usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
 237                 f_fb->out_req = NULL;
 238         }
 239         if (f_fb->in_req) {
 240                 free(f_fb->in_req->buf);
 241                 usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
 242                 f_fb->in_req = NULL;
 243         }
 244 }
 245
 246 static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
 247 {
 248         struct usb_request *req;
 249
 250         req = usb_ep_alloc_request(ep, 0);
 251         if (!req)
 252                 return NULL;
 253
 254         req->length = EP_BUFFER_SIZE;
 255         req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
 256         if (!req->buf) {
 257                 usb_ep_free_request(ep, req);
 258                 return NULL;
 259         }
 260
 261         memset(req->buf, 0, req->length);
 262         return req;
 263 }
 264
 265 static int fastboot_set_alt(struct usb_function *f,
 266                             unsigned interface, unsigned alt)
 267 {
 268         int ret;
 269         struct usb_composite_dev *cdev = f->config->cdev;
 270         struct usb_gadget *gadget = cdev->gadget;
 271         struct f_fastboot *f_fb = func_to_fastboot(f);
 272         const struct usb_endpoint_descriptor *d;
 273
 274         debug("%s: func: %s intf: %d alt: %d\n",
 275               __func__, f->name, interface, alt);
 276
 277         d = fb_ep_desc(gadget, &fs_ep_out, &hs_ep_out);
 278         ret = usb_ep_enable(f_fb->out_ep, d);
 279         if (ret) {
 280                 puts("failed to enable out ep\n");
 281                 return ret;
 282         }
 283
 284         f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
 285         if (!f_fb->out_req) {
 286                 puts("failed to alloc out req\n");
 287                 ret = -EINVAL;
 288                 goto err;
 289         }
 290         f_fb->out_req->complete = rx_handler_command;
 291
 292         d = fb_ep_desc(gadget, &fs_ep_in, &hs_ep_in);
 293         ret = usb_ep_enable(f_fb->in_ep, d);
 294         if (ret) {
 295                 puts("failed to enable in ep\n");
 296                 goto err;
 297         }
 298
 299         f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
 300         if (!f_fb->in_req) {
 301                 puts("failed alloc req in\n");
 302                 ret = -EINVAL;
 303                 goto err;
 304         }
 305         f_fb->in_req->complete = fastboot_complete;
 306
 307         ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
 308         if (ret)
 309                 goto err;
 310
 311         return 0;
 312 err:
 313         fastboot_disable(f);
 314         return ret;
 315 }
 316
 317 static int fastboot_add(struct usb_configuration *c)
 318 {
 319         struct f_fastboot *f_fb = fastboot_func;
 320         int status;
 321
 322         debug("%s: cdev: 0x%p\n", __func__, c->cdev);
 323
 324         if (!f_fb) {
 325                 f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
 326                 if (!f_fb)
 327                         return -ENOMEM;
 328
 329                 fastboot_func = f_fb;
 330                 memset(f_fb, 0, sizeof(*f_fb));
 331         }
 332
 333         f_fb->usb_function.name = "f_fastboot";
 334         f_fb->usb_function.bind = fastboot_bind;
 335         f_fb->usb_function.unbind = fastboot_unbind;
 336         f_fb->usb_function.set_alt = fastboot_set_alt;
 337         f_fb->usb_function.disable = fastboot_disable;
 338         f_fb->usb_function.strings = fastboot_strings;
 339
 340         status = usb_add_function(c, &f_fb->usb_function);
 341         if (status) {
 342                 free(f_fb);
 343                 fastboot_func = f_fb;
 344         }
 345
 346         return status;
 347 }
 348 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);
 349
 350 static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
 351 {
 352         struct usb_request *in_req = fastboot_func->in_req;
 353         int ret;
 354
 355         memcpy(in_req->buf, buffer, buffer_size);
 356         in_req->length = buffer_size;
 357
 358         usb_ep_dequeue(fastboot_func->in_ep, in_req);
 359
 360         ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
 361         if (ret)
 362                 printf("Error %d on queue\n", ret);
 363         return 0;
 364 }
 365
 366 static int fastboot_tx_write_str(const char *buffer)
 367 {
 368         return fastboot_tx_write(buffer, strlen(buffer));
 369 }
 370
 371 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
 372 {
 373         do_reset(NULL, 0, 0, NULL);
 374 }
 375
 376 int __weak fb_set_reboot_flag(void)
 377 {
 378         return -ENOSYS;
 379 }
 380
 381 static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
 382 {
 383         char *cmd = req->buf;
 384         if (!strcmp_l1("reboot-bootloader", cmd)) {
 385                 if (fb_set_reboot_flag()) {
 386                         fastboot_tx_write_str("FAILCannot set reboot flag");
 387                         return;
 388                 }
 389         }
 390         fastboot_func->in_req->complete = compl_do_reset;
 391         fastboot_tx_write_str("OKAY");
 392 }
 393
 394 static int strcmp_l1(const char *s1, const char *s2)
 395 {
 396         if (!s1 || !s2)
 397                 return -1;
 398         return strncmp(s1, s2, strlen(s1));
 399 }
 400
 401 static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
 402 {
 403         char *cmd = req->buf;
 404         char response[FASTBOOT_RESPONSE_LEN];
 405         const char *s;
 406         size_t chars_left;
 407
 408         strcpy(response, "OKAY");
 409         chars_left = sizeof(response) - strlen(response) - 1;
 410
 411         strsep(&cmd, ":");
 412         if (!cmd) {
 413                 pr_err("missing variable");
 414                 fastboot_tx_write_str("FAILmissing var");
 415                 return;
 416         }
 417
 418         if (!strcmp_l1("version", cmd)) {
 419                 strncat(response, FASTBOOT_VERSION, chars_left);
 420         } else if (!strcmp_l1("bootloader-version", cmd)) {
 421                 strncat(response, U_BOOT_VERSION, chars_left);
 422         } else if (!strcmp_l1("downloadsize", cmd) ||
 423                 !strcmp_l1("max-download-size", cmd)) {
 424                 char str_num[12];
 425
 426                 sprintf(str_num, "0x%08x", CONFIG_FASTBOOT_BUF_SIZE);
 427                 strncat(response, str_num, chars_left);
 428         } else if (!strcmp_l1("serialno", cmd)) {
 429                 s = env_get("serial#");
 430                 if (s)
 431                         strncat(response, s, chars_left);
 432                 else
 433                         strcpy(response, "FAILValue not set");
 434         } else {
 435                 char *envstr;
 436
 437                 envstr = malloc(strlen("fastboot.") + strlen(cmd) + 1);
 438                 if (!envstr) {
 439                         fastboot_tx_write_str("FAILmalloc error");
 440                         return;
 441                 }
 442
 443                 sprintf(envstr, "fastboot.%s", cmd);
 444                 s = env_get(envstr);
 445                 if (s) {
 446                         strncat(response, s, chars_left);
 447                 } else {
 448                         printf("WARNING: unknown variable: %s\n", cmd);
 449                         strcpy(response, "FAILVariable not implemented");
 450                 }
 451
 452                 free(envstr);
 453         }
 454         fastboot_tx_write_str(response);
 455 }
 456
 457 static unsigned int rx_bytes_expected(struct usb_ep *ep)
 458 {
 459         int rx_remain = download_size - download_bytes;
 460         unsigned int rem;
 461         unsigned int maxpacket = ep->maxpacket;
 462
 463         if (rx_remain <= 0)
 464                 return 0;
 465         else if (rx_remain > EP_BUFFER_SIZE)
 466                 return EP_BUFFER_SIZE;
 467
 468         /*
 469          * Some controllers e.g. DWC3 don't like OUT transfers to be
 470          * not ending in maxpacket boundary. So just make them happy by
 471          * always requesting for integral multiple of maxpackets.
 472          * This shouldn't bother controllers that don't care about it.
 473          */
 474         rem = rx_remain % maxpacket;
 475         if (rem > 0)
 476                 rx_remain = rx_remain + (maxpacket - rem);
 477
 478         return rx_remain;
 479 }
 480
 481 #define BYTES_PER_DOT   0x20000
 482 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
 483 {
 484         char response[FASTBOOT_RESPONSE_LEN];
 485         unsigned int transfer_size = download_size - download_bytes;
 486         const unsigned char *buffer = req->buf;
 487         unsigned int buffer_size = req->actual;
 488         unsigned int pre_dot_num, now_dot_num;
 489
 490         if (req->status != 0) {
 491                 printf("Bad status: %d\n", req->status);
 492                 return;
 493         }
 494
 495         if (buffer_size < transfer_size)
 496                 transfer_size = buffer_size;
 497
 498         memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes,
 499                buffer, transfer_size);
 500
 501         pre_dot_num = download_bytes / BYTES_PER_DOT;
 502         download_bytes += transfer_size;
 503         now_dot_num = download_bytes / BYTES_PER_DOT;
 504
 505         if (pre_dot_num != now_dot_num) {
 506                 putc('.');
 507                 if (!(now_dot_num % 74))
 508                         putc('\n');
 509         }
 510
 511         /* Check if transfer is done */
 512         if (download_bytes >= download_size) {
 513                 /*
 514                  * Reset global transfer variable, keep download_bytes because
 515                  * it will be used in the next possible flashing command
 516                  */
 517                 download_size = 0;
 518                 req->complete = rx_handler_command;
 519                 req->length = EP_BUFFER_SIZE;
 520
 521                 strcpy(response, "OKAY");
 522                 fastboot_tx_write_str(response);
 523
 524                 printf("\ndownloading of %d bytes finished\n", download_bytes);
 525         } else {
 526                 req->length = rx_bytes_expected(ep);
 527         }
 528
 529         req->actual = 0;
 530         usb_ep_queue(ep, req, 0);
 531 }
 532
 533 static void cb_download(struct usb_ep *ep, struct usb_request *req)
 534 {
 535         char *cmd = req->buf;
 536         char response[FASTBOOT_RESPONSE_LEN];
 537
 538         strsep(&cmd, ":");
 539         download_size = simple_strtoul(cmd, NULL, 16);
 540         download_bytes = 0;
 541
 542         printf("Starting download of %d bytes\n", download_size);
 543
 544         if (0 == download_size) {
 545                 strcpy(response, "FAILdata invalid size");
 546         } else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) {
 547                 download_size = 0;
 548                 strcpy(response, "FAILdata too large");
 549         } else {
 550                 sprintf(response, "DATA%08x", download_size);
 551                 req->complete = rx_handler_dl_image;
 552                 req->length = rx_bytes_expected(ep);
 553         }
 554         fastboot_tx_write_str(response);
 555 }
 556
 557 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
 558 {
 559         char boot_addr_start[12];
 560         char *bootm_args[] = { "bootm", boot_addr_start, NULL };
 561
 562         puts("Booting kernel..\n");
 563
 564         sprintf(boot_addr_start, "0x%lx", (long)CONFIG_FASTBOOT_BUF_ADDR);
 565         do_bootm(NULL, 0, 2, bootm_args);
 566
 567         /* This only happens if image is somehow faulty so we start over */
 568         do_reset(NULL, 0, 0, NULL);
 569 }
 570
 571 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
 572 {
 573         fastboot_func->in_req->complete = do_bootm_on_complete;
 574         fastboot_tx_write_str("OKAY");
 575 }
 576
 577 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
 578 {
 579         g_dnl_trigger_detach();
 580 }
 581
 582 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
 583 {
 584         fastboot_func->in_req->complete = do_exit_on_complete;
 585         fastboot_tx_write_str("OKAY");
 586 }
 587
 588 #ifdef CONFIG_FASTBOOT_FLASH
 589 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
 590 {
 591         char *cmd = req->buf;
 592         char response[FASTBOOT_RESPONSE_LEN];
 593
 594         strsep(&cmd, ":");
 595         if (!cmd) {
 596                 pr_err("missing partition name");
 597                 fastboot_tx_write_str("FAILmissing partition name");
 598                 return;
 599         }
 600
 601         /* initialize the response buffer */
 602         fb_response_str = response;
 603
 604         fastboot_fail("no flash device defined");
 605 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 606         fb_mmc_flash_write(cmd, (void *)CONFIG_FASTBOOT_BUF_ADDR,
 607                            download_bytes);
 608 #endif
 609 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
 610         fb_nand_flash_write(cmd,
 611                             (void *)CONFIG_FASTBOOT_BUF_ADDR,
 612                             download_bytes);
 613 #endif
 614         fastboot_tx_write_str(response);
 615 }
 616 #endif
 617
 618 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
 619 {
 620         char *cmd = req->buf;
 621 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 622         if (strncmp("format", cmd + 4, 6) == 0) {
 623                 char cmdbuf[32];
 624                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
 625                         CONFIG_FASTBOOT_FLASH_MMC_DEV);
 626                 if (run_command(cmdbuf, 0))
 627                         fastboot_tx_write_str("FAIL");
 628                 else
 629                         fastboot_tx_write_str("OKAY");
 630         } else
 631 #endif
 632         if (strncmp("unlock", cmd + 4, 8) == 0) {
 633                 fastboot_tx_write_str("FAILnot implemented");
 634         }
 635         else {
 636                 fastboot_tx_write_str("FAILunknown oem command");
 637         }
 638 }
 639
 640 #ifdef CONFIG_FASTBOOT_FLASH
 641 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
 642 {
 643         char *cmd = req->buf;
 644         char response[FASTBOOT_RESPONSE_LEN];
 645
 646         strsep(&cmd, ":");
 647         if (!cmd) {
 648                 pr_err("missing partition name");
 649                 fastboot_tx_write_str("FAILmissing partition name");
 650                 return;
 651         }
 652
 653         /* initialize the response buffer */
 654         fb_response_str = response;
 655
 656         fastboot_fail("no flash device defined");
 657 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 658         fb_mmc_erase(cmd);
 659 #endif
 660 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
 661         fb_nand_erase(cmd);
 662 #endif
 663         fastboot_tx_write_str(response);
 664 }
 665 #endif
 666
 667 struct cmd_dispatch_info {
 668         char *cmd;
 669         void (*cb)(struct usb_ep *ep, struct usb_request *req);
 670 };
 671
 672 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
 673         {
 674                 .cmd = "reboot",
 675                 .cb = cb_reboot,
 676         }, {
 677                 .cmd = "getvar:",
 678                 .cb = cb_getvar,
 679         }, {
 680                 .cmd = "download:",
 681                 .cb = cb_download,
 682         }, {
 683                 .cmd = "boot",
 684                 .cb = cb_boot,
 685         }, {
 686                 .cmd = "continue",
 687                 .cb = cb_continue,
 688         },
 689 #ifdef CONFIG_FASTBOOT_FLASH
 690         {
 691                 .cmd = "flash",
 692                 .cb = cb_flash,
 693         }, {
 694                 .cmd = "erase",
 695                 .cb = cb_erase,
 696         },
 697 #endif
 698         {
 699                 .cmd = "oem",
 700                 .cb = cb_oem,
 701         },
 702 };
 703
 704 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
 705 {
 706         char *cmdbuf = req->buf;
 707         void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
 708         int i;
 709
 710         if (req->status != 0 || req->length == 0)
 711                 return;
 712
 713         for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
 714                 if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
 715                         func_cb = cmd_dispatch_info[i].cb;
 716                         break;
 717                 }
 718         }
 719
 720         if (!func_cb) {
 721                 pr_err("unknown command: %.*s", req->actual, cmdbuf);
 722                 fastboot_tx_write_str("FAILunknown command");
 723         } else {
 724                 if (req->actual < req->length) {
 725                         u8 *buf = (u8 *)req->buf;
 726                         buf[req->actual] = 0;
 727                         func_cb(ep, req);
 728                 } else {
 729                         pr_err("buffer overflow");
 730                         fastboot_tx_write_str("FAILbuffer overflow");
 731                 }
 732         }
 733
 734         *cmdbuf = '\0';
 735         req->actual = 0;
 736         usb_ep_queue(ep, req, 0);
 737 }