drivers/usb/gadget/f_sdp.c

   1 /*
   2  * f_sdp.c -- USB HID Serial Download Protocol
   3  *
   4  * Copyright (C) 2017 Toradex
   5  * Author: Stefan Agner <stefan.agner@toradex.com>
   6  *
   7  * This file implements the Serial Download Protocol (SDP) as specified in
   8  * the i.MX 6 Reference Manual. The SDP is a USB HID based protocol and
   9  * allows to download images directly to memory. The implementation
  10  * works with the imx_loader (imx_usb) USB client software on host side.
  11  *
  12  * Not all commands are implemented, e.g. WRITE_REGISTER, DCD_WRITE and
  13  * SKIP_DCD_HEADER are only stubs.
  14  *
  15  * Parts of the implementation are based on f_dfu and f_thor.
  16  *
  17  * SPDX-License-Identifier:     GPL-2.0+
  18  */
  19
  20 #include <errno.h>
  21 #include <common.h>
  22 #include <console.h>
  23 #include <malloc.h>
  24
  25 #include <linux/usb/ch9.h>
  26 #include <linux/usb/gadget.h>
  27 #include <linux/usb/composite.h>
  28
  29 #include <asm/io.h>
  30 #include <g_dnl.h>
  31 #include <sdp.h>
  32 #include <imximage.h>
  33
  34 #define HID_REPORT_ID_MASK      0x000000ff
  35
  36 /*
  37  * HID class requests
  38  */
  39 #define HID_REQ_GET_REPORT              0x01
  40 #define HID_REQ_GET_IDLE                0x02
  41 #define HID_REQ_GET_PROTOCOL            0x03
  42 #define HID_REQ_SET_REPORT              0x09
  43 #define HID_REQ_SET_IDLE                0x0A
  44 #define HID_REQ_SET_PROTOCOL            0x0B
  45
  46 #define HID_USAGE_PAGE_LEN              76
  47
  48 struct hid_report {
  49         u8 usage_page[HID_USAGE_PAGE_LEN];
  50 } __packed;
  51
  52 #define SDP_READ_REGISTER       0x0101
  53 #define SDP_WRITE_REGISTER      0x0202
  54 #define SDP_WRITE_FILE          0x0404
  55 #define SDP_ERROR_STATUS        0x0505
  56 #define SDP_DCD_WRITE           0x0a0a
  57 #define SDP_JUMP_ADDRESS        0x0b0b
  58 #define SDP_SKIP_DCD_HEADER     0x0c0c
  59
  60 #define SDP_SECURITY_CLOSED             0x12343412
  61 #define SDP_SECURITY_OPEN               0x56787856
  62
  63 #define SDP_WRITE_FILE_COMPLETE         0x88888888
  64 #define SDP_WRITE_REGISTER_COMPLETE     0x128A8A12
  65 #define SDP_SKIP_DCD_HEADER_COMPLETE    0x900DD009
  66 #define SDP_ERROR_IMXHEADER             0x000a0533
  67
  68 #define SDP_COMMAND_LEN         16
  69
  70 struct sdp_command {
  71         u16 cmd;
  72         u32 addr;
  73         u8 format;
  74         u32 cnt;
  75         u32 data;
  76         u8 rsvd;
  77 } __packed;
  78
  79 enum sdp_state {
  80         SDP_STATE_IDLE,
  81         SDP_STATE_RX_DCD_DATA,
  82         SDP_STATE_RX_FILE_DATA,
  83         SDP_STATE_TX_SEC_CONF,
  84         SDP_STATE_TX_SEC_CONF_BUSY,
  85         SDP_STATE_TX_REGISTER,
  86         SDP_STATE_TX_REGISTER_BUSY,
  87         SDP_STATE_TX_STATUS,
  88         SDP_STATE_TX_STATUS_BUSY,
  89         SDP_STATE_JUMP,
  90 };
  91
  92 struct f_sdp {
  93         struct usb_function             usb_function;
  94
  95         struct usb_descriptor_header    **function;
  96
  97         u8                              altsetting;
  98         enum sdp_state                  state;
  99         enum sdp_state                  next_state;
 100         u32                             dnl_address;
 101         u32                             dnl_bytes_remaining;
 102         u32                             jmp_address;
 103         bool                            always_send_status;
 104         u32                             error_status;
 105
 106         /* EP0 request */
 107         struct usb_request              *req;
 108
 109         /* EP1 IN */
 110         struct usb_ep                   *in_ep;
 111         struct usb_request              *in_req;
 112
 113         bool                            configuration_done;
 114 };
 115
 116 static struct f_sdp *sdp_func;
 117
 118 static inline struct f_sdp *func_to_sdp(struct usb_function *f)
 119 {
 120         return container_of(f, struct f_sdp, usb_function);
 121 }
 122
 123 static struct usb_interface_descriptor sdp_intf_runtime = {
 124         .bLength =              sizeof(sdp_intf_runtime),
 125         .bDescriptorType =      USB_DT_INTERFACE,
 126         .bAlternateSetting =    0,
 127         .bNumEndpoints =        1,
 128         .bInterfaceClass =      USB_CLASS_HID,
 129         .bInterfaceSubClass =   0,
 130         .bInterfaceProtocol =   0,
 131         /* .iInterface = DYNAMIC */
 132 };
 133
 134 /* HID configuration */
 135 static struct usb_class_hid_descriptor sdp_hid_desc = {
 136         .bLength =              sizeof(sdp_hid_desc),
 137         .bDescriptorType =      USB_DT_CS_DEVICE,
 138
 139         .bcdCDC =               __constant_cpu_to_le16(0x0110),
 140         .bCountryCode =         0,
 141         .bNumDescriptors =      1,
 142
 143         .bDescriptorType0       = USB_DT_HID_REPORT,
 144         .wDescriptorLength0     = HID_USAGE_PAGE_LEN,
 145 };
 146
 147 static struct usb_endpoint_descriptor in_desc = {
 148         .bLength =              USB_DT_ENDPOINT_SIZE,
 149         .bDescriptorType =      USB_DT_ENDPOINT, /*USB_DT_CS_ENDPOINT*/
 150
 151         .bEndpointAddress =     1 | USB_DIR_IN,
 152         .bmAttributes = USB_ENDPOINT_XFER_INT,
 153         .wMaxPacketSize =       64,
 154         .bInterval =            1,
 155 };
 156
 157 static struct usb_descriptor_header *sdp_runtime_descs[] = {
 158         (struct usb_descriptor_header *)&sdp_intf_runtime,
 159         (struct usb_descriptor_header *)&sdp_hid_desc,
 160         (struct usb_descriptor_header *)&in_desc,
 161         NULL,
 162 };
 163
 164 /* This is synchronized with what the SoC implementation reports */
 165 static struct hid_report sdp_hid_report = {
 166         .usage_page = {
 167                 0x06, 0x00, 0xff, /* Usage Page */
 168                 0x09, 0x01, /* Usage (Pointer?) */
 169                 0xa1, 0x01, /* Collection */
 170
 171                 0x85, 0x01, /* Report ID */
 172                 0x19, 0x01, /* Usage Minimum */
 173                 0x29, 0x01, /* Usage Maximum */
 174                 0x15, 0x00, /* Local Minimum */
 175                 0x26, 0xFF, 0x00, /* Local Maximum? */
 176                 0x75, 0x08, /* Report Size */
 177                 0x95, 0x10, /* Report Count */
 178                 0x91, 0x02, /* Output Data */
 179
 180                 0x85, 0x02, /* Report ID */
 181                 0x19, 0x01, /* Usage Minimum */
 182                 0x29, 0x01, /* Usage Maximum */
 183                 0x15, 0x00, /* Local Minimum */
 184                 0x26, 0xFF, 0x00, /* Local Maximum? */
 185                 0x75, 0x80, /* Report Size 128 */
 186                 0x95, 0x40, /* Report Count */
 187                 0x91, 0x02, /* Output Data */
 188
 189                 0x85, 0x03, /* Report ID */
 190                 0x19, 0x01, /* Usage Minimum */
 191                 0x29, 0x01, /* Usage Maximum */
 192                 0x15, 0x00, /* Local Minimum */
 193                 0x26, 0xFF, 0x00, /* Local Maximum? */
 194                 0x75, 0x08, /* Report Size 8 */
 195                 0x95, 0x04, /* Report Count */
 196                 0x81, 0x02, /* Input Data */
 197
 198                 0x85, 0x04, /* Report ID */
 199                 0x19, 0x01, /* Usage Minimum */
 200                 0x29, 0x01, /* Usage Maximum */
 201                 0x15, 0x00, /* Local Minimum */
 202                 0x26, 0xFF, 0x00, /* Local Maximum? */
 203                 0x75, 0x08, /* Report Size 8 */
 204                 0x95, 0x40, /* Report Count */
 205                 0x81, 0x02, /* Input Data */
 206                 0xc0
 207         },
 208 };
 209
 210 static const char sdp_name[] = "Serial Downloader Protocol";
 211
 212 /*
 213  * static strings, in UTF-8
 214  */
 215 static struct usb_string strings_sdp_generic[] = {
 216         [0].s = sdp_name,
 217         {  }                    /* end of list */
 218 };
 219
 220 static struct usb_gadget_strings stringtab_sdp_generic = {
 221         .language       = 0x0409,       /* en-us */
 222         .strings        = strings_sdp_generic,
 223 };
 224
 225 static struct usb_gadget_strings *sdp_generic_strings[] = {
 226         &stringtab_sdp_generic,
 227         NULL,
 228 };
 229
 230 static void sdp_rx_command_complete(struct usb_ep *ep, struct usb_request *req)
 231 {
 232         struct f_sdp *sdp = req->context;
 233         int status = req->status;
 234         u8 *data = req->buf;
 235         u8 report = data[0];
 236
 237         if (status != 0) {
 238                 error("Status: %d", status);
 239                 return;
 240         }
 241
 242         if (report != 1) {
 243                 error("Unexpected report %d", report);
 244                 return;
 245         }
 246
 247         struct sdp_command *cmd = req->buf + 1;
 248
 249         debug("%s: command: %04x, addr: %08x, cnt: %u\n",
 250               __func__, be16_to_cpu(cmd->cmd),
 251               be32_to_cpu(cmd->addr), be32_to_cpu(cmd->cnt));
 252
 253         switch (be16_to_cpu(cmd->cmd)) {
 254         case SDP_READ_REGISTER:
 255                 sdp->always_send_status = false;
 256                 sdp->error_status = 0x0;
 257
 258                 sdp->state = SDP_STATE_TX_SEC_CONF;
 259                 sdp->dnl_address = be32_to_cpu(cmd->addr);
 260                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 261                 sdp->next_state = SDP_STATE_TX_REGISTER;
 262                 printf("Reading %d registers at 0x%08x... ",
 263                        sdp->dnl_bytes_remaining, sdp->dnl_address);
 264                 break;
 265         case SDP_WRITE_FILE:
 266                 sdp->always_send_status = true;
 267                 sdp->error_status = SDP_WRITE_FILE_COMPLETE;
 268
 269                 sdp->state = SDP_STATE_RX_FILE_DATA;
 270                 sdp->dnl_address = be32_to_cpu(cmd->addr);
 271                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 272                 sdp->next_state = SDP_STATE_IDLE;
 273
 274                 printf("Downloading file of size %d to 0x%08x... ",
 275                        sdp->dnl_bytes_remaining, sdp->dnl_address);
 276
 277                 break;
 278         case SDP_ERROR_STATUS:
 279                 sdp->always_send_status = true;
 280                 sdp->error_status = 0;
 281
 282                 sdp->state = SDP_STATE_TX_SEC_CONF;
 283                 sdp->next_state = SDP_STATE_IDLE;
 284                 break;
 285         case SDP_DCD_WRITE:
 286                 sdp->always_send_status = true;
 287                 sdp->error_status = SDP_WRITE_REGISTER_COMPLETE;
 288
 289                 sdp->state = SDP_STATE_RX_DCD_DATA;
 290                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 291                 sdp->next_state = SDP_STATE_IDLE;
 292                 break;
 293         case SDP_JUMP_ADDRESS:
 294                 sdp->always_send_status = false;
 295                 sdp->error_status = 0;
 296
 297                 sdp->jmp_address = be32_to_cpu(cmd->addr);
 298                 sdp->state = SDP_STATE_TX_SEC_CONF;
 299                 sdp->next_state = SDP_STATE_JUMP;
 300                 break;
 301         case SDP_SKIP_DCD_HEADER:
 302                 sdp->always_send_status = true;
 303                 sdp->error_status = SDP_SKIP_DCD_HEADER_COMPLETE;
 304
 305                 /* Ignore command, DCD not supported anyway */
 306                 sdp->state = SDP_STATE_TX_SEC_CONF;
 307                 sdp->next_state = SDP_STATE_IDLE;
 308                 break;
 309         default:
 310                 error("Unknown command: %04x\n", be16_to_cpu(cmd->cmd));
 311         }
 312 }
 313
 314 static void sdp_rx_data_complete(struct usb_ep *ep, struct usb_request *req)
 315 {
 316         struct f_sdp *sdp = req->context;
 317         int status = req->status;
 318         u8 *data = req->buf;
 319         u8 report = data[0];
 320         int datalen = req->length - 1;
 321
 322         if (status != 0) {
 323                 error("Status: %d", status);
 324                 return;
 325         }
 326
 327         if (report != 2) {
 328                 error("Unexpected report %d", report);
 329                 return;
 330         }
 331
 332         if (sdp->dnl_bytes_remaining < datalen) {
 333                 /*
 334                  * Some USB stacks require to send a complete buffer as
 335                  * specified in the HID descriptor. This leads to longer
 336                  * transfers than the file length, no problem for us.
 337                  */
 338                 sdp->dnl_bytes_remaining = 0;
 339         } else {
 340                 sdp->dnl_bytes_remaining -= datalen;
 341         }
 342
 343         if (sdp->state == SDP_STATE_RX_FILE_DATA) {
 344                 memcpy((void *)sdp->dnl_address, req->buf + 1, datalen);
 345                 sdp->dnl_address += datalen;
 346         }
 347
 348         if (sdp->dnl_bytes_remaining)
 349                 return;
 350
 351         printf("done\n");
 352
 353         switch (sdp->state) {
 354         case SDP_STATE_RX_FILE_DATA:
 355                 sdp->state = SDP_STATE_TX_SEC_CONF;
 356                 break;
 357         case SDP_STATE_RX_DCD_DATA:
 358                 sdp->state = SDP_STATE_TX_SEC_CONF;
 359                 break;
 360         default:
 361                 error("Invalid state: %d", sdp->state);
 362         }
 363 }
 364
 365 static void sdp_tx_complete(struct usb_ep *ep, struct usb_request *req)
 366 {
 367         struct f_sdp *sdp = req->context;
 368         int status = req->status;
 369
 370         if (status != 0) {
 371                 error("Status: %d", status);
 372                 return;
 373         }
 374
 375         switch (sdp->state) {
 376         case SDP_STATE_TX_SEC_CONF_BUSY:
 377                 /* Not all commands require status report */
 378                 if (sdp->always_send_status || sdp->error_status)
 379                         sdp->state = SDP_STATE_TX_STATUS;
 380                 else
 381                         sdp->state = sdp->next_state;
 382
 383                 break;
 384         case SDP_STATE_TX_STATUS_BUSY:
 385                 sdp->state = sdp->next_state;
 386                 break;
 387         case SDP_STATE_TX_REGISTER_BUSY:
 388                 if (sdp->dnl_bytes_remaining)
 389                         sdp->state = SDP_STATE_TX_REGISTER;
 390                 else
 391                         sdp->state = SDP_STATE_IDLE;
 392                 break;
 393         default:
 394                 error("Wrong State: %d", sdp->state);
 395                 sdp->state = SDP_STATE_IDLE;
 396                 break;
 397         }
 398         debug("%s complete --> %d, %d/%d\n", ep->name,
 399               status, req->actual, req->length);
 400 }
 401
 402 static int sdp_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 403 {
 404         struct usb_gadget *gadget = f->config->cdev->gadget;
 405         struct usb_request *req = f->config->cdev->req;
 406         struct f_sdp *sdp = f->config->cdev->req->context;
 407         u16 len = le16_to_cpu(ctrl->wLength);
 408         u16 w_value = le16_to_cpu(ctrl->wValue);
 409         int value = 0;
 410         u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
 411
 412         debug("w_value: 0x%04x len: 0x%04x\n", w_value, len);
 413         debug("req_type: 0x%02x ctrl->bRequest: 0x%02x sdp->state: %d\n",
 414               req_type, ctrl->bRequest, sdp->state);
 415
 416         if (req_type == USB_TYPE_STANDARD) {
 417                 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR) {
 418                         /* Send HID report descriptor */
 419                         value = min(len, (u16) sizeof(sdp_hid_report));
 420                         memcpy(req->buf, &sdp_hid_report, value);
 421                         sdp->configuration_done = true;
 422                 }
 423         }
 424
 425         if (req_type == USB_TYPE_CLASS) {
 426                 int report = w_value & HID_REPORT_ID_MASK;
 427
 428                 /* HID (SDP) request */
 429                 switch (ctrl->bRequest) {
 430                 case HID_REQ_SET_REPORT:
 431                         switch (report) {
 432                         case 1:
 433                                 value = SDP_COMMAND_LEN + 1;
 434                                 req->complete = sdp_rx_command_complete;
 435                                 break;
 436                         case 2:
 437                                 value = len;
 438                                 req->complete = sdp_rx_data_complete;
 439                                 break;
 440                         }
 441                 }
 442         }
 443
 444         if (value >= 0) {
 445                 req->length = value;
 446                 req->zero = value < len;
 447                 value = usb_ep_queue(gadget->ep0, req, 0);
 448                 if (value < 0) {
 449                         debug("ep_queue --> %d\n", value);
 450                         req->status = 0;
 451                 }
 452         }
 453
 454         return value;
 455 }
 456
 457 static int sdp_bind(struct usb_configuration *c, struct usb_function *f)
 458 {
 459         struct usb_gadget *gadget = c->cdev->gadget;
 460         struct usb_composite_dev *cdev = c->cdev;
 461         struct f_sdp *sdp = func_to_sdp(f);
 462         int rv = 0, id;
 463
 464         id = usb_interface_id(c, f);
 465         if (id < 0)
 466                 return id;
 467         sdp_intf_runtime.bInterfaceNumber = id;
 468
 469         struct usb_ep *ep;
 470
 471         /* allocate instance-specific endpoints */
 472         ep = usb_ep_autoconfig(gadget, &in_desc);
 473         if (!ep) {
 474                 rv = -ENODEV;
 475                 goto error;
 476         }
 477
 478         sdp->in_ep = ep; /* Store IN EP for enabling @ setup */
 479
 480         cdev->req->context = sdp;
 481
 482 error:
 483         return rv;
 484 }
 485
 486 static void sdp_unbind(struct usb_configuration *c, struct usb_function *f)
 487 {
 488         free(sdp_func);
 489         sdp_func = NULL;
 490 }
 491
 492 static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length)
 493 {
 494         struct usb_request *req;
 495
 496         req = usb_ep_alloc_request(ep, 0);
 497         if (!req)
 498                 return req;
 499
 500         req->length = length;
 501         req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, length);
 502         if (!req->buf) {
 503                 usb_ep_free_request(ep, req);
 504                 req = NULL;
 505         }
 506
 507         return req;
 508 }
 509
 510
 511 static struct usb_request *sdp_start_ep(struct usb_ep *ep)
 512 {
 513         struct usb_request *req;
 514
 515         req = alloc_ep_req(ep, 64);
 516         debug("%s: ep:%p req:%p\n", __func__, ep, req);
 517
 518         if (!req)
 519                 return NULL;
 520
 521         memset(req->buf, 0, req->length);
 522         req->complete = sdp_tx_complete;
 523
 524         return req;
 525 }
 526 static int sdp_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 527 {
 528         struct f_sdp *sdp = func_to_sdp(f);
 529         struct usb_composite_dev *cdev = f->config->cdev;
 530         int result;
 531
 532         debug("%s: intf: %d alt: %d\n", __func__, intf, alt);
 533
 534         result = usb_ep_enable(sdp->in_ep, &in_desc);
 535         if (result)
 536                 return result;
 537         sdp->in_req = sdp_start_ep(sdp->in_ep);
 538         sdp->in_req->context = sdp;
 539
 540         sdp->in_ep->driver_data = cdev; /* claim */
 541
 542         sdp->altsetting = alt;
 543         sdp->state = SDP_STATE_IDLE;
 544
 545         return 0;
 546 }
 547
 548 static int sdp_get_alt(struct usb_function *f, unsigned intf)
 549 {
 550         struct f_sdp *sdp = func_to_sdp(f);
 551
 552         return sdp->altsetting;
 553 }
 554
 555 static void sdp_disable(struct usb_function *f)
 556 {
 557         struct f_sdp *sdp = func_to_sdp(f);
 558
 559         usb_ep_disable(sdp->in_ep);
 560
 561         if (sdp->in_req) {
 562                 free(sdp->in_req);
 563                 sdp->in_req = NULL;
 564         }
 565 }
 566
 567 static int sdp_bind_config(struct usb_configuration *c)
 568 {
 569         int status;
 570
 571         if (!sdp_func) {
 572                 sdp_func = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*sdp_func));
 573                 if (!sdp_func)
 574                         return -ENOMEM;
 575         }
 576
 577         memset(sdp_func, 0, sizeof(*sdp_func));
 578
 579         sdp_func->usb_function.name = "sdp";
 580         sdp_func->usb_function.hs_descriptors = sdp_runtime_descs;
 581         sdp_func->usb_function.descriptors = sdp_runtime_descs;
 582         sdp_func->usb_function.bind = sdp_bind;
 583         sdp_func->usb_function.unbind = sdp_unbind;
 584         sdp_func->usb_function.set_alt = sdp_set_alt;
 585         sdp_func->usb_function.get_alt = sdp_get_alt;
 586         sdp_func->usb_function.disable = sdp_disable;
 587         sdp_func->usb_function.strings = sdp_generic_strings;
 588         sdp_func->usb_function.setup = sdp_setup;
 589
 590         status = usb_add_function(c, &sdp_func->usb_function);
 591
 592         return status;
 593 }
 594
 595 int sdp_init(int controller_index)
 596 {
 597         printf("SDP: initialize...\n");
 598         while (!sdp_func->configuration_done) {
 599                 if (ctrlc()) {
 600                         puts("\rCTRL+C - Operation aborted.\n");
 601                         return 1;
 602                 }
 603                 usb_gadget_handle_interrupts(controller_index);
 604         }
 605
 606         return 0;
 607 }
 608
 609 static u32 sdp_jump_imxheader(void *address)
 610 {
 611         flash_header_v2_t *headerv2 = address;
 612         ulong (*entry)(void);
 613
 614         if (headerv2->header.tag != IVT_HEADER_TAG) {
 615                 printf("Header Tag is not an IMX image\n");
 616                 return SDP_ERROR_IMXHEADER;
 617         }
 618
 619         printf("Jumping to 0x%08x\n", headerv2->entry);
 620         entry = (void *)headerv2->entry;
 621         entry();
 622
 623         /* The image probably never returns hence we won't reach that point */
 624         return 0;
 625 }
 626
 627 static void sdp_handle_in_ep(void)
 628 {
 629         u8 *data = sdp_func->in_req->buf;
 630         u32 status;
 631         int datalen;
 632
 633         switch (sdp_func->state) {
 634         case SDP_STATE_TX_SEC_CONF:
 635                 debug("Report 3: HAB security\n");
 636                 data[0] = 3;
 637
 638                 status = SDP_SECURITY_OPEN;
 639                 memcpy(&data[1], &status, 4);
 640                 sdp_func->in_req->length = 5;
 641                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 642                 sdp_func->state = SDP_STATE_TX_SEC_CONF_BUSY;
 643                 break;
 644
 645         case SDP_STATE_TX_STATUS:
 646                 debug("Report 4: Status\n");
 647                 data[0] = 4;
 648
 649                 memcpy(&data[1], &sdp_func->error_status, 4);
 650                 sdp_func->in_req->length = 65;
 651                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 652                 sdp_func->state = SDP_STATE_TX_STATUS_BUSY;
 653                 break;
 654         case SDP_STATE_TX_REGISTER:
 655                 debug("Report 4: Register Values\n");
 656                 data[0] = 4;
 657
 658                 datalen = sdp_func->dnl_bytes_remaining;
 659
 660                 if (datalen > 64)
 661                         datalen = 64;
 662
 663                 memcpy(&data[1], (void *)sdp_func->dnl_address, datalen);
 664                 sdp_func->in_req->length = 65;
 665
 666                 sdp_func->dnl_bytes_remaining -= datalen;
 667                 sdp_func->dnl_address += datalen;
 668
 669                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 670                 sdp_func->state = SDP_STATE_TX_REGISTER_BUSY;
 671                 break;
 672         case SDP_STATE_JUMP:
 673                 printf("Checking imxheader at 0x%08x\n", f_sdp->jmp_address);
 674                 status = sdp_jump_imxheader((void *)f_sdp->jmp_address);
 675
 676                 sdp_func->next_state = SDP_STATE_IDLE;
 677                 sdp_func->error_status = status;
 678
 679                 /* Only send Report 4 if there was an error */
 680                 if (status)
 681                         sdp_func->state = SDP_STATE_TX_STATUS;
 682                 else
 683                         sdp_func->state = SDP_STATE_IDLE;
 684                 break;
 685         default:
 686                 break;
 687         };
 688 }
 689
 690 void sdp_handle(int controller_index)
 691 {
 692         printf("SDP: handle requests...\n");
 693         while (1) {
 694                 if (ctrlc()) {
 695                         puts("\rCTRL+C - Operation aborted.\n");
 696                         return;
 697                 }
 698
 699                 usb_gadget_handle_interrupts(controller_index);
 700
 701                 sdp_handle_in_ep();
 702         }
 703 }
 704
 705 int sdp_add(struct usb_configuration *c)
 706 {
 707         int id;
 708
 709         id = usb_string_id(c->cdev);
 710         if (id < 0)
 711                 return id;
 712         strings_sdp_generic[0].id = id;
 713         sdp_intf_runtime.iInterface = id;
 714
 715         debug("%s: cdev: %p gadget: %p gadget->ep0: %p\n", __func__,
 716               c->cdev, c->cdev->gadget, c->cdev->gadget->ep0);
 717
 718         return sdp_bind_config(c);
 719 }
 720
 721 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_sdp, sdp_add);