drivers/usb/gadget/f_dfu.c

   1 /*
   2  * f_dfu.c -- Device Firmware Update USB function
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * authors: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
   6  *          Lukasz Majewski <l.majewski@samsung.com>
   7  *
   8  * Based on OpenMoko u-boot: drivers/usb/usbdfu.c
   9  * (C) 2007 by OpenMoko, Inc.
  10  * Author: Harald Welte <laforge@openmoko.org>
  11  *
  12  * based on existing SAM7DFU code from OpenPCD:
  13  * (C) Copyright 2006 by Harald Welte <hwelte at hmw-consulting.de>
  14  *
  15  * SPDX-License-Identifier:     GPL-2.0+
  16  */
  17
  18 #include <errno.h>
  19 #include <common.h>
  20 #include <malloc.h>
  21
  22 #include <linux/usb/ch9.h>
  23 #include <linux/usb/gadget.h>
  24 #include <linux/usb/composite.h>
  25
  26 #include <dfu.h>
  27 #include "f_dfu.h"
  28
  29 struct f_dfu {
  30         struct usb_function             usb_function;
  31
  32         struct usb_descriptor_header    **function;
  33         struct usb_string               *strings;
  34
  35         /* when configured, we have one config */
  36         u8                              config;
  37         u8                              altsetting;
  38         enum dfu_state                  dfu_state;
  39         unsigned int                    dfu_status;
  40
  41         /* Send/received block number is handy for data integrity check */
  42         int                             blk_seq_num;
  43         unsigned int                    poll_timeout;
  44 };
  45
  46 typedef int (*dfu_state_fn) (struct f_dfu *,
  47                              const struct usb_ctrlrequest *,
  48                              struct usb_gadget *,
  49                              struct usb_request *);
  50
  51 static inline struct f_dfu *func_to_dfu(struct usb_function *f)
  52 {
  53         return container_of(f, struct f_dfu, usb_function);
  54 }
  55
  56 static const struct dfu_function_descriptor dfu_func = {
  57         .bLength =              sizeof dfu_func,
  58         .bDescriptorType =      DFU_DT_FUNC,
  59         .bmAttributes =         DFU_BIT_WILL_DETACH |
  60                                 DFU_BIT_MANIFESTATION_TOLERANT |
  61                                 DFU_BIT_CAN_UPLOAD |
  62                                 DFU_BIT_CAN_DNLOAD,
  63         .wDetachTimeOut =       0,
  64         .wTransferSize =        DFU_USB_BUFSIZ,
  65         .bcdDFUVersion =        __constant_cpu_to_le16(0x0110),
  66 };
  67
  68 static struct usb_interface_descriptor dfu_intf_runtime = {
  69         .bLength =              sizeof dfu_intf_runtime,
  70         .bDescriptorType =      USB_DT_INTERFACE,
  71         .bNumEndpoints =        0,
  72         .bInterfaceClass =      USB_CLASS_APP_SPEC,
  73         .bInterfaceSubClass =   1,
  74         .bInterfaceProtocol =   1,
  75         /* .iInterface = DYNAMIC */
  76 };
  77
  78 static struct usb_descriptor_header *dfu_runtime_descs[] = {
  79         (struct usb_descriptor_header *) &dfu_intf_runtime,
  80         NULL,
  81 };
  82
  83 static const struct usb_qualifier_descriptor dev_qualifier = {
  84         .bLength =              sizeof dev_qualifier,
  85         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
  86         .bcdUSB =               __constant_cpu_to_le16(0x0200),
  87         .bDeviceClass =         USB_CLASS_VENDOR_SPEC,
  88         .bNumConfigurations =   1,
  89 };
  90
  91 static const char dfu_name[] = "Device Firmware Upgrade";
  92
  93 /*
  94  * static strings, in UTF-8
  95  *
  96  * dfu_generic configuration
  97  */
  98 static struct usb_string strings_dfu_generic[] = {
  99         [0].s = dfu_name,
 100         {  }                    /* end of list */
 101 };
 102
 103 static struct usb_gadget_strings stringtab_dfu_generic = {
 104         .language       = 0x0409,       /* en-us */
 105         .strings        = strings_dfu_generic,
 106 };
 107
 108 static struct usb_gadget_strings *dfu_generic_strings[] = {
 109         &stringtab_dfu_generic,
 110         NULL,
 111 };
 112
 113 /*
 114  * usb_function specific
 115  */
 116 static struct usb_gadget_strings stringtab_dfu = {
 117         .language       = 0x0409,       /* en-us */
 118         /*
 119          * .strings
 120          *
 121          * assigned during initialization,
 122          * depends on number of flash entities
 123          *
 124          */
 125 };
 126
 127 static struct usb_gadget_strings *dfu_strings[] = {
 128         &stringtab_dfu,
 129         NULL,
 130 };
 131
 132 static void dfu_set_poll_timeout(struct dfu_status *dstat, unsigned int ms)
 133 {
 134         /*
 135          * The bwPollTimeout DFU_GETSTATUS request payload provides information
 136          * about minimum time, in milliseconds, that the host should wait before
 137          * sending a subsequent DFU_GETSTATUS request
 138          *
 139          * This permits the device to vary the delay depending on its need to
 140          * erase or program the memory
 141          *
 142          */
 143
 144         unsigned char *p = (unsigned char *)&ms;
 145
 146         if (!ms || (ms & ~DFU_POLL_TIMEOUT_MASK)) {
 147                 dstat->bwPollTimeout[0] = 0;
 148                 dstat->bwPollTimeout[1] = 0;
 149                 dstat->bwPollTimeout[2] = 0;
 150
 151                 return;
 152         }
 153
 154         dstat->bwPollTimeout[0] = *p++;
 155         dstat->bwPollTimeout[1] = *p++;
 156         dstat->bwPollTimeout[2] = *p;
 157 }
 158
 159 /*-------------------------------------------------------------------------*/
 160
 161 static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req)
 162 {
 163         struct f_dfu *f_dfu = req->context;
 164
 165         dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf,
 166                   req->length, f_dfu->blk_seq_num);
 167 }
 168
 169 static void dnload_request_flush(struct usb_ep *ep, struct usb_request *req)
 170 {
 171         struct f_dfu *f_dfu = req->context;
 172
 173         dfu_flush(dfu_get_entity(f_dfu->altsetting), req->buf,
 174                   req->length, f_dfu->blk_seq_num);
 175 }
 176
 177 static void handle_getstatus(struct usb_request *req)
 178 {
 179         struct dfu_status *dstat = (struct dfu_status *)req->buf;
 180         struct f_dfu *f_dfu = req->context;
 181
 182         dfu_set_poll_timeout(dstat, 0);
 183
 184         switch (f_dfu->dfu_state) {
 185         case DFU_STATE_dfuDNLOAD_SYNC:
 186         case DFU_STATE_dfuDNBUSY:
 187                 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE;
 188                 break;
 189         case DFU_STATE_dfuMANIFEST_SYNC:
 190                 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST;
 191                 break;
 192         case DFU_STATE_dfuMANIFEST:
 193                 dfu_set_poll_timeout(dstat, DFU_MANIFEST_POLL_TIMEOUT);
 194         default:
 195                 break;
 196         }
 197
 198         if (f_dfu->poll_timeout)
 199                 if (!(f_dfu->blk_seq_num %
 200                       (dfu_get_buf_size() / DFU_USB_BUFSIZ)))
 201                         dfu_set_poll_timeout(dstat, f_dfu->poll_timeout);
 202
 203         /* send status response */
 204         dstat->bStatus = f_dfu->dfu_status;
 205         dstat->bState = f_dfu->dfu_state;
 206         dstat->iString = 0;
 207 }
 208
 209 static void handle_getstate(struct usb_request *req)
 210 {
 211         struct f_dfu *f_dfu = req->context;
 212
 213         ((u8 *)req->buf)[0] = f_dfu->dfu_state;
 214         req->actual = sizeof(u8);
 215 }
 216
 217 static inline void to_dfu_mode(struct f_dfu *f_dfu)
 218 {
 219         f_dfu->usb_function.strings = dfu_strings;
 220         f_dfu->usb_function.hs_descriptors = f_dfu->function;
 221         f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 222 }
 223
 224 static inline void to_runtime_mode(struct f_dfu *f_dfu)
 225 {
 226         f_dfu->usb_function.strings = NULL;
 227         f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
 228 }
 229
 230 static int handle_upload(struct usb_request *req, u16 len)
 231 {
 232         struct f_dfu *f_dfu = req->context;
 233
 234         return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf,
 235                         req->length, f_dfu->blk_seq_num);
 236 }
 237
 238 static int handle_dnload(struct usb_gadget *gadget, u16 len)
 239 {
 240         struct usb_composite_dev *cdev = get_gadget_data(gadget);
 241         struct usb_request *req = cdev->req;
 242         struct f_dfu *f_dfu = req->context;
 243
 244         if (len == 0)
 245                 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC;
 246
 247         req->complete = dnload_request_complete;
 248
 249         return len;
 250 }
 251
 252 /*-------------------------------------------------------------------------*/
 253 /* DFU state machine  */
 254 static int state_app_idle(struct f_dfu *f_dfu,
 255                           const struct usb_ctrlrequest *ctrl,
 256                           struct usb_gadget *gadget,
 257                           struct usb_request *req)
 258 {
 259         int value = 0;
 260
 261         switch (ctrl->bRequest) {
 262         case USB_REQ_DFU_GETSTATUS:
 263                 handle_getstatus(req);
 264                 value = RET_STAT_LEN;
 265                 break;
 266         case USB_REQ_DFU_GETSTATE:
 267                 handle_getstate(req);
 268                 break;
 269         case USB_REQ_DFU_DETACH:
 270                 f_dfu->dfu_state = DFU_STATE_appDETACH;
 271                 to_dfu_mode(f_dfu);
 272                 value = RET_ZLP;
 273                 break;
 274         default:
 275                 value = RET_STALL;
 276                 break;
 277         }
 278
 279         return value;
 280 }
 281
 282 static int state_app_detach(struct f_dfu *f_dfu,
 283                             const struct usb_ctrlrequest *ctrl,
 284                             struct usb_gadget *gadget,
 285                             struct usb_request *req)
 286 {
 287         int value = 0;
 288
 289         switch (ctrl->bRequest) {
 290         case USB_REQ_DFU_GETSTATUS:
 291                 handle_getstatus(req);
 292                 value = RET_STAT_LEN;
 293                 break;
 294         case USB_REQ_DFU_GETSTATE:
 295                 handle_getstate(req);
 296                 break;
 297         default:
 298                 f_dfu->dfu_state = DFU_STATE_appIDLE;
 299                 value = RET_STALL;
 300                 break;
 301         }
 302
 303         return value;
 304 }
 305
 306 static int state_dfu_idle(struct f_dfu *f_dfu,
 307                           const struct usb_ctrlrequest *ctrl,
 308                           struct usb_gadget *gadget,
 309                           struct usb_request *req)
 310 {
 311         u16 w_value = le16_to_cpu(ctrl->wValue);
 312         u16 len = le16_to_cpu(ctrl->wLength);
 313         int value = 0;
 314
 315         switch (ctrl->bRequest) {
 316         case USB_REQ_DFU_DNLOAD:
 317                 if (len == 0) {
 318                         f_dfu->dfu_state = DFU_STATE_dfuERROR;
 319                         value = RET_STALL;
 320                         break;
 321                 }
 322                 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
 323                 f_dfu->blk_seq_num = w_value;
 324                 value = handle_dnload(gadget, len);
 325                 break;
 326         case USB_REQ_DFU_UPLOAD:
 327                 f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE;
 328                 f_dfu->blk_seq_num = 0;
 329                 value = handle_upload(req, len);
 330                 break;
 331         case USB_REQ_DFU_ABORT:
 332                 /* no zlp? */
 333                 value = RET_ZLP;
 334                 break;
 335         case USB_REQ_DFU_GETSTATUS:
 336                 handle_getstatus(req);
 337                 value = RET_STAT_LEN;
 338                 break;
 339         case USB_REQ_DFU_GETSTATE:
 340                 handle_getstate(req);
 341                 break;
 342         case USB_REQ_DFU_DETACH:
 343                 /*
 344                  * Proprietary extension: 'detach' from idle mode and
 345                  * get back to runtime mode in case of USB Reset.  As
 346                  * much as I dislike this, we just can't use every USB
 347                  * bus reset to switch back to runtime mode, since at
 348                  * least the Linux USB stack likes to send a number of
 349                  * resets in a row :(
 350                  */
 351                 f_dfu->dfu_state =
 352                         DFU_STATE_dfuMANIFEST_WAIT_RST;
 353                 to_runtime_mode(f_dfu);
 354                 f_dfu->dfu_state = DFU_STATE_appIDLE;
 355
 356                 dfu_trigger_reset();
 357                 break;
 358         default:
 359                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 360                 value = RET_STALL;
 361                 break;
 362         }
 363
 364         return value;
 365 }
 366
 367 static int state_dfu_dnload_sync(struct f_dfu *f_dfu,
 368                                  const struct usb_ctrlrequest *ctrl,
 369                                  struct usb_gadget *gadget,
 370                                  struct usb_request *req)
 371 {
 372         int value = 0;
 373
 374         switch (ctrl->bRequest) {
 375         case USB_REQ_DFU_GETSTATUS:
 376                 handle_getstatus(req);
 377                 value = RET_STAT_LEN;
 378                 break;
 379         case USB_REQ_DFU_GETSTATE:
 380                 handle_getstate(req);
 381                 break;
 382         default:
 383                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 384                 value = RET_STALL;
 385                 break;
 386         }
 387
 388         return value;
 389 }
 390
 391 static int state_dfu_dnbusy(struct f_dfu *f_dfu,
 392                             const struct usb_ctrlrequest *ctrl,
 393                             struct usb_gadget *gadget,
 394                             struct usb_request *req)
 395 {
 396         int value = 0;
 397
 398         switch (ctrl->bRequest) {
 399         case USB_REQ_DFU_GETSTATUS:
 400                 handle_getstatus(req);
 401                 value = RET_STAT_LEN;
 402                 break;
 403         default:
 404                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 405                 value = RET_STALL;
 406                 break;
 407         }
 408
 409         return value;
 410 }
 411
 412 static int state_dfu_dnload_idle(struct f_dfu *f_dfu,
 413                                  const struct usb_ctrlrequest *ctrl,
 414                                  struct usb_gadget *gadget,
 415                                  struct usb_request *req)
 416 {
 417         u16 w_value = le16_to_cpu(ctrl->wValue);
 418         u16 len = le16_to_cpu(ctrl->wLength);
 419         int value = 0;
 420
 421         switch (ctrl->bRequest) {
 422         case USB_REQ_DFU_DNLOAD:
 423                 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
 424                 f_dfu->blk_seq_num = w_value;
 425                 value = handle_dnload(gadget, len);
 426                 break;
 427         case USB_REQ_DFU_ABORT:
 428                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 429                 value = RET_ZLP;
 430                 break;
 431         case USB_REQ_DFU_GETSTATUS:
 432                 handle_getstatus(req);
 433                 value = RET_STAT_LEN;
 434                 break;
 435         case USB_REQ_DFU_GETSTATE:
 436                 handle_getstate(req);
 437                 break;
 438         default:
 439                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 440                 value = RET_STALL;
 441                 break;
 442         }
 443
 444         return value;
 445 }
 446
 447 static int state_dfu_manifest_sync(struct f_dfu *f_dfu,
 448                                    const struct usb_ctrlrequest *ctrl,
 449                                    struct usb_gadget *gadget,
 450                                    struct usb_request *req)
 451 {
 452         int value = 0;
 453
 454         switch (ctrl->bRequest) {
 455         case USB_REQ_DFU_GETSTATUS:
 456                 /* We're MainfestationTolerant */
 457                 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST;
 458                 handle_getstatus(req);
 459                 f_dfu->blk_seq_num = 0;
 460                 value = RET_STAT_LEN;
 461                 req->complete = dnload_request_flush;
 462                 break;
 463         case USB_REQ_DFU_GETSTATE:
 464                 handle_getstate(req);
 465                 break;
 466         default:
 467                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 468                 value = RET_STALL;
 469                 break;
 470         }
 471
 472         return value;
 473 }
 474
 475 static int state_dfu_manifest(struct f_dfu *f_dfu,
 476                               const struct usb_ctrlrequest *ctrl,
 477                               struct usb_gadget *gadget,
 478                               struct usb_request *req)
 479 {
 480         int value = 0;
 481
 482         switch (ctrl->bRequest) {
 483         case USB_REQ_DFU_GETSTATUS:
 484                 /* We're MainfestationTolerant */
 485                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 486                 handle_getstatus(req);
 487                 f_dfu->blk_seq_num = 0;
 488                 value = RET_STAT_LEN;
 489                 puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n");
 490                 break;
 491         case USB_REQ_DFU_GETSTATE:
 492                 handle_getstate(req);
 493                 break;
 494         default:
 495                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 496                 value = RET_STALL;
 497                 break;
 498         }
 499         return value;
 500 }
 501
 502 static int state_dfu_upload_idle(struct f_dfu *f_dfu,
 503                                  const struct usb_ctrlrequest *ctrl,
 504                                  struct usb_gadget *gadget,
 505                                  struct usb_request *req)
 506 {
 507         u16 w_value = le16_to_cpu(ctrl->wValue);
 508         u16 len = le16_to_cpu(ctrl->wLength);
 509         int value = 0;
 510
 511         switch (ctrl->bRequest) {
 512         case USB_REQ_DFU_UPLOAD:
 513                 /* state transition if less data then requested */
 514                 f_dfu->blk_seq_num = w_value;
 515                 value = handle_upload(req, len);
 516                 if (value >= 0 && value < len)
 517                         f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 518                 break;
 519         case USB_REQ_DFU_ABORT:
 520                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 521                 /* no zlp? */
 522                 value = RET_ZLP;
 523                 break;
 524         case USB_REQ_DFU_GETSTATUS:
 525                 handle_getstatus(req);
 526                 value = RET_STAT_LEN;
 527                 break;
 528         case USB_REQ_DFU_GETSTATE:
 529                 handle_getstate(req);
 530                 break;
 531         default:
 532                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 533                 value = RET_STALL;
 534                 break;
 535         }
 536
 537         return value;
 538 }
 539
 540 static int state_dfu_error(struct f_dfu *f_dfu,
 541                                  const struct usb_ctrlrequest *ctrl,
 542                                  struct usb_gadget *gadget,
 543                                  struct usb_request *req)
 544 {
 545         int value = 0;
 546
 547         switch (ctrl->bRequest) {
 548         case USB_REQ_DFU_GETSTATUS:
 549                 handle_getstatus(req);
 550                 value = RET_STAT_LEN;
 551                 break;
 552         case USB_REQ_DFU_GETSTATE:
 553                 handle_getstate(req);
 554                 break;
 555         case USB_REQ_DFU_CLRSTATUS:
 556                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 557                 f_dfu->dfu_status = DFU_STATUS_OK;
 558                 /* no zlp? */
 559                 value = RET_ZLP;
 560                 break;
 561         default:
 562                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 563                 value = RET_STALL;
 564                 break;
 565         }
 566
 567         return value;
 568 }
 569
 570 static dfu_state_fn dfu_state[] = {
 571         state_app_idle,          /* DFU_STATE_appIDLE */
 572         state_app_detach,        /* DFU_STATE_appDETACH */
 573         state_dfu_idle,          /* DFU_STATE_dfuIDLE */
 574         state_dfu_dnload_sync,   /* DFU_STATE_dfuDNLOAD_SYNC */
 575         state_dfu_dnbusy,        /* DFU_STATE_dfuDNBUSY */
 576         state_dfu_dnload_idle,   /* DFU_STATE_dfuDNLOAD_IDLE */
 577         state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */
 578         state_dfu_manifest,      /* DFU_STATE_dfuMANIFEST */
 579         NULL,                    /* DFU_STATE_dfuMANIFEST_WAIT_RST */
 580         state_dfu_upload_idle,   /* DFU_STATE_dfuUPLOAD_IDLE */
 581         state_dfu_error          /* DFU_STATE_dfuERROR */
 582 };
 583
 584 static int
 585 dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 586 {
 587         struct usb_gadget *gadget = f->config->cdev->gadget;
 588         struct usb_request *req = f->config->cdev->req;
 589         struct f_dfu *f_dfu = f->config->cdev->req->context;
 590         u16 len = le16_to_cpu(ctrl->wLength);
 591         u16 w_value = le16_to_cpu(ctrl->wValue);
 592         int value = 0;
 593         u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
 594
 595         debug("w_value: 0x%x len: 0x%x\n", w_value, len);
 596         debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n",
 597                req_type, ctrl->bRequest, f_dfu->dfu_state);
 598
 599         if (req_type == USB_TYPE_STANDARD) {
 600                 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR &&
 601                     (w_value >> 8) == DFU_DT_FUNC) {
 602                         value = min(len, (u16) sizeof(dfu_func));
 603                         memcpy(req->buf, &dfu_func, value);
 604                 }
 605         } else /* DFU specific request */
 606                 value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req);
 607
 608         if (value >= 0) {
 609                 req->length = value;
 610                 req->zero = value < len;
 611                 value = usb_ep_queue(gadget->ep0, req, 0);
 612                 if (value < 0) {
 613                         debug("ep_queue --> %d\n", value);
 614                         req->status = 0;
 615                 }
 616         }
 617
 618         return value;
 619 }
 620
 621 /*-------------------------------------------------------------------------*/
 622
 623 static int
 624 dfu_prepare_strings(struct f_dfu *f_dfu, int n)
 625 {
 626         struct dfu_entity *de = NULL;
 627         int i = 0;
 628
 629         f_dfu->strings = calloc(sizeof(struct usb_string), n + 1);
 630         if (!f_dfu->strings)
 631                 goto enomem;
 632
 633         for (i = 0; i < n; ++i) {
 634                 de = dfu_get_entity(i);
 635                 f_dfu->strings[i].s = de->name;
 636         }
 637
 638         f_dfu->strings[i].id = 0;
 639         f_dfu->strings[i].s = NULL;
 640
 641         return 0;
 642
 643 enomem:
 644         while (i)
 645                 f_dfu->strings[--i].s = NULL;
 646
 647         free(f_dfu->strings);
 648
 649         return -ENOMEM;
 650 }
 651
 652 static int dfu_prepare_function(struct f_dfu *f_dfu, int n)
 653 {
 654         struct usb_interface_descriptor *d;
 655         int i = 0;
 656
 657         f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n + 1);
 658         if (!f_dfu->function)
 659                 goto enomem;
 660
 661         for (i = 0; i < n; ++i) {
 662                 d = calloc(sizeof(*d), 1);
 663                 if (!d)
 664                         goto enomem;
 665
 666                 d->bLength =            sizeof(*d);
 667                 d->bDescriptorType =    USB_DT_INTERFACE;
 668                 d->bAlternateSetting =  i;
 669                 d->bNumEndpoints =      0;
 670                 d->bInterfaceClass =    USB_CLASS_APP_SPEC;
 671                 d->bInterfaceSubClass = 1;
 672                 d->bInterfaceProtocol = 2;
 673
 674                 f_dfu->function[i] = (struct usb_descriptor_header *)d;
 675         }
 676         f_dfu->function[i] = NULL;
 677
 678         return 0;
 679
 680 enomem:
 681         while (i) {
 682                 free(f_dfu->function[--i]);
 683                 f_dfu->function[i] = NULL;
 684         }
 685         free(f_dfu->function);
 686
 687         return -ENOMEM;
 688 }
 689
 690 static int dfu_bind(struct usb_configuration *c, struct usb_function *f)
 691 {
 692         struct usb_composite_dev *cdev = c->cdev;
 693         struct f_dfu *f_dfu = func_to_dfu(f);
 694         int alt_num = dfu_get_alt_number();
 695         int rv, id, i;
 696
 697         id = usb_interface_id(c, f);
 698         if (id < 0)
 699                 return id;
 700         dfu_intf_runtime.bInterfaceNumber = id;
 701
 702         f_dfu->dfu_state = DFU_STATE_appIDLE;
 703         f_dfu->dfu_status = DFU_STATUS_OK;
 704
 705         rv = dfu_prepare_function(f_dfu, alt_num);
 706         if (rv)
 707                 goto error;
 708
 709         rv = dfu_prepare_strings(f_dfu, alt_num);
 710         if (rv)
 711                 goto error;
 712         for (i = 0; i < alt_num; i++) {
 713                 id = usb_string_id(cdev);
 714                 if (id < 0)
 715                         return id;
 716                 f_dfu->strings[i].id = id;
 717                 ((struct usb_interface_descriptor *)f_dfu->function[i])
 718                         ->iInterface = id;
 719         }
 720
 721         to_dfu_mode(f_dfu);
 722
 723         stringtab_dfu.strings = f_dfu->strings;
 724
 725         cdev->req->context = f_dfu;
 726
 727 error:
 728         return rv;
 729 }
 730
 731 static void dfu_unbind(struct usb_configuration *c, struct usb_function *f)
 732 {
 733         struct f_dfu *f_dfu = func_to_dfu(f);
 734         int alt_num = dfu_get_alt_number();
 735         int i;
 736
 737         if (f_dfu->strings) {
 738                 i = alt_num;
 739                 while (i)
 740                         f_dfu->strings[--i].s = NULL;
 741
 742                 free(f_dfu->strings);
 743         }
 744
 745         if (f_dfu->function) {
 746                 i = alt_num;
 747                 while (i) {
 748                         free(f_dfu->function[--i]);
 749                         f_dfu->function[i] = NULL;
 750                 }
 751                 free(f_dfu->function);
 752         }
 753
 754         free(f_dfu);
 755 }
 756
 757 static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 758 {
 759         struct f_dfu *f_dfu = func_to_dfu(f);
 760
 761         debug("%s: intf:%d alt:%d\n", __func__, intf, alt);
 762
 763         f_dfu->altsetting = alt;
 764
 765         return 0;
 766 }
 767
 768 /* TODO: is this really what we need here? */
 769 static void dfu_disable(struct usb_function *f)
 770 {
 771         struct f_dfu *f_dfu = func_to_dfu(f);
 772         if (f_dfu->config == 0)
 773                 return;
 774
 775         debug("%s: reset config\n", __func__);
 776
 777         f_dfu->config = 0;
 778 }
 779
 780 static int dfu_bind_config(struct usb_configuration *c)
 781 {
 782         struct f_dfu *f_dfu;
 783         int status;
 784
 785         f_dfu = calloc(sizeof(*f_dfu), 1);
 786         if (!f_dfu)
 787                 return -ENOMEM;
 788         f_dfu->usb_function.name = "dfu";
 789         f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
 790         f_dfu->usb_function.bind = dfu_bind;
 791         f_dfu->usb_function.unbind = dfu_unbind;
 792         f_dfu->usb_function.set_alt = dfu_set_alt;
 793         f_dfu->usb_function.disable = dfu_disable;
 794         f_dfu->usb_function.strings = dfu_generic_strings;
 795         f_dfu->usb_function.setup = dfu_handle;
 796         f_dfu->poll_timeout = DFU_DEFAULT_POLL_TIMEOUT;
 797
 798         status = usb_add_function(c, &f_dfu->usb_function);
 799         if (status)
 800                 free(f_dfu);
 801
 802         return status;
 803 }
 804
 805 int dfu_add(struct usb_configuration *c)
 806 {
 807         int id;
 808
 809         id = usb_string_id(c->cdev);
 810         if (id < 0)
 811                 return id;
 812         strings_dfu_generic[0].id = id;
 813         dfu_intf_runtime.iInterface = id;
 814
 815         debug("%s: cdev: 0x%p gadget:0x%p gadget->ep0: 0x%p\n", __func__,
 816                c->cdev, c->cdev->gadget, c->cdev->gadget->ep0);
 817
 818         return dfu_bind_config(c);
 819 }