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