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  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <errno.h>
  24 #include <common.h>
  25 #include <malloc.h>
  26
  27 #include <linux/usb/ch9.h>
  28 #include <linux/usb/gadget.h>
  29 #include <linux/usb/composite.h>
  30
  31 #include <dfu.h>
  32 #include "f_dfu.h"
  33
  34 struct f_dfu {
  35         struct usb_function             usb_function;
  36
  37         struct usb_descriptor_header    **function;
  38         struct usb_string               *strings;
  39
  40         /* when configured, we have one config */
  41         u8                              config;
  42         u8                              altsetting;
  43         enum dfu_state                  dfu_state;
  44         unsigned int                    dfu_status;
  45
  46         /* Send/received block number is handy for data integrity check */
  47         int                             blk_seq_num;
  48 };
  49
  50 typedef int (*dfu_state_fn) (struct f_dfu *,
  51                              const struct usb_ctrlrequest *,
  52                              struct usb_gadget *,
  53                              struct usb_request *);
  54
  55 static inline struct f_dfu *func_to_dfu(struct usb_function *f)
  56 {
  57         return container_of(f, struct f_dfu, usb_function);
  58 }
  59
  60 static const struct dfu_function_descriptor dfu_func = {
  61         .bLength =              sizeof dfu_func,
  62         .bDescriptorType =      DFU_DT_FUNC,
  63         .bmAttributes =         DFU_BIT_WILL_DETACH |
  64                                 DFU_BIT_MANIFESTATION_TOLERANT |
  65                                 DFU_BIT_CAN_UPLOAD |
  66                                 DFU_BIT_CAN_DNLOAD,
  67         .wDetachTimeOut =       0,
  68         .wTransferSize =        DFU_USB_BUFSIZ,
  69         .bcdDFUVersion =        __constant_cpu_to_le16(0x0110),
  70 };
  71
  72 static struct usb_interface_descriptor dfu_intf_runtime = {
  73         .bLength =              sizeof dfu_intf_runtime,
  74         .bDescriptorType =      USB_DT_INTERFACE,
  75         .bNumEndpoints =        0,
  76         .bInterfaceClass =      USB_CLASS_APP_SPEC,
  77         .bInterfaceSubClass =   1,
  78         .bInterfaceProtocol =   1,
  79         /* .iInterface = DYNAMIC */
  80 };
  81
  82 static struct usb_descriptor_header *dfu_runtime_descs[] = {
  83         (struct usb_descriptor_header *) &dfu_intf_runtime,
  84         NULL,
  85 };
  86
  87 static const struct usb_qualifier_descriptor dev_qualifier = {
  88         .bLength =              sizeof dev_qualifier,
  89         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
  90         .bcdUSB =               __constant_cpu_to_le16(0x0200),
  91         .bDeviceClass =         USB_CLASS_VENDOR_SPEC,
  92         .bNumConfigurations =   1,
  93 };
  94
  95 static const char dfu_name[] = "Device Firmware Upgrade";
  96
  97 /*
  98  * static strings, in UTF-8
  99  *
 100  * dfu_generic configuration
 101  */
 102 static struct usb_string strings_dfu_generic[] = {
 103         [0].s = dfu_name,
 104         {  }                    /* end of list */
 105 };
 106
 107 static struct usb_gadget_strings stringtab_dfu_generic = {
 108         .language       = 0x0409,       /* en-us */
 109         .strings        = strings_dfu_generic,
 110 };
 111
 112 static struct usb_gadget_strings *dfu_generic_strings[] = {
 113         &stringtab_dfu_generic,
 114         NULL,
 115 };
 116
 117 /*
 118  * usb_function specific
 119  */
 120 static struct usb_gadget_strings stringtab_dfu = {
 121         .language       = 0x0409,       /* en-us */
 122         /*
 123          * .strings
 124          *
 125          * assigned during initialization,
 126          * depends on number of flash entities
 127          *
 128          */
 129 };
 130
 131 static struct usb_gadget_strings *dfu_strings[] = {
 132         &stringtab_dfu,
 133         NULL,
 134 };
 135
 136 /*-------------------------------------------------------------------------*/
 137
 138 static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req)
 139 {
 140         struct f_dfu *f_dfu = req->context;
 141
 142         dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf,
 143                   req->length, f_dfu->blk_seq_num);
 144
 145         if (req->length == 0)
 146                 puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n");
 147 }
 148
 149 static void handle_getstatus(struct usb_request *req)
 150 {
 151         struct dfu_status *dstat = (struct dfu_status *)req->buf;
 152         struct f_dfu *f_dfu = req->context;
 153
 154         switch (f_dfu->dfu_state) {
 155         case DFU_STATE_dfuDNLOAD_SYNC:
 156         case DFU_STATE_dfuDNBUSY:
 157                 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE;
 158                 break;
 159         case DFU_STATE_dfuMANIFEST_SYNC:
 160                 break;
 161         default:
 162                 break;
 163         }
 164
 165         /* send status response */
 166         dstat->bStatus = f_dfu->dfu_status;
 167         dstat->bState = f_dfu->dfu_state;
 168         dstat->iString = 0;
 169 }
 170
 171 static void handle_getstate(struct usb_request *req)
 172 {
 173         struct f_dfu *f_dfu = req->context;
 174
 175         ((u8 *)req->buf)[0] = f_dfu->dfu_state;
 176         req->actual = sizeof(u8);
 177 }
 178
 179 static inline void to_dfu_mode(struct f_dfu *f_dfu)
 180 {
 181         f_dfu->usb_function.strings = dfu_strings;
 182         f_dfu->usb_function.hs_descriptors = f_dfu->function;
 183 }
 184
 185 static inline void to_runtime_mode(struct f_dfu *f_dfu)
 186 {
 187         f_dfu->usb_function.strings = NULL;
 188         f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
 189 }
 190
 191 static int handle_upload(struct usb_request *req, u16 len)
 192 {
 193         struct f_dfu *f_dfu = req->context;
 194
 195         return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf,
 196                         req->length, f_dfu->blk_seq_num);
 197 }
 198
 199 static int handle_dnload(struct usb_gadget *gadget, u16 len)
 200 {
 201         struct usb_composite_dev *cdev = get_gadget_data(gadget);
 202         struct usb_request *req = cdev->req;
 203         struct f_dfu *f_dfu = req->context;
 204
 205         if (len == 0)
 206                 f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC;
 207
 208         req->complete = dnload_request_complete;
 209
 210         return len;
 211 }
 212
 213 /*-------------------------------------------------------------------------*/
 214 /* DFU state machine  */
 215 static int state_app_idle(struct f_dfu *f_dfu,
 216                           const struct usb_ctrlrequest *ctrl,
 217                           struct usb_gadget *gadget,
 218                           struct usb_request *req)
 219 {
 220         int value = 0;
 221
 222         switch (ctrl->bRequest) {
 223         case USB_REQ_DFU_GETSTATUS:
 224                 handle_getstatus(req);
 225                 value = RET_STAT_LEN;
 226                 break;
 227         case USB_REQ_DFU_GETSTATE:
 228                 handle_getstate(req);
 229                 break;
 230         case USB_REQ_DFU_DETACH:
 231                 f_dfu->dfu_state = DFU_STATE_appDETACH;
 232                 to_dfu_mode(f_dfu);
 233                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 234                 value = RET_ZLP;
 235                 break;
 236         default:
 237                 value = RET_STALL;
 238                 break;
 239         }
 240
 241         return value;
 242 }
 243
 244 static int state_app_detach(struct f_dfu *f_dfu,
 245                             const struct usb_ctrlrequest *ctrl,
 246                             struct usb_gadget *gadget,
 247                             struct usb_request *req)
 248 {
 249         int value = 0;
 250
 251         switch (ctrl->bRequest) {
 252         case USB_REQ_DFU_GETSTATUS:
 253                 handle_getstatus(req);
 254                 value = RET_STAT_LEN;
 255                 break;
 256         case USB_REQ_DFU_GETSTATE:
 257                 handle_getstate(req);
 258                 break;
 259         default:
 260                 f_dfu->dfu_state = DFU_STATE_appIDLE;
 261                 value = RET_STALL;
 262                 break;
 263         }
 264
 265         return value;
 266 }
 267
 268 static int state_dfu_idle(struct f_dfu *f_dfu,
 269                           const struct usb_ctrlrequest *ctrl,
 270                           struct usb_gadget *gadget,
 271                           struct usb_request *req)
 272 {
 273         u16 w_value = le16_to_cpu(ctrl->wValue);
 274         u16 len = le16_to_cpu(ctrl->wLength);
 275         int value = 0;
 276
 277         switch (ctrl->bRequest) {
 278         case USB_REQ_DFU_DNLOAD:
 279                 if (len == 0) {
 280                         f_dfu->dfu_state = DFU_STATE_dfuERROR;
 281                         value = RET_STALL;
 282                         break;
 283                 }
 284                 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
 285                 f_dfu->blk_seq_num = w_value;
 286                 value = handle_dnload(gadget, len);
 287                 break;
 288         case USB_REQ_DFU_UPLOAD:
 289                 f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE;
 290                 f_dfu->blk_seq_num = 0;
 291                 value = handle_upload(req, len);
 292                 break;
 293         case USB_REQ_DFU_ABORT:
 294                 /* no zlp? */
 295                 value = RET_ZLP;
 296                 break;
 297         case USB_REQ_DFU_GETSTATUS:
 298                 handle_getstatus(req);
 299                 value = RET_STAT_LEN;
 300                 break;
 301         case USB_REQ_DFU_GETSTATE:
 302                 handle_getstate(req);
 303                 break;
 304         case USB_REQ_DFU_DETACH:
 305                 /*
 306                  * Proprietary extension: 'detach' from idle mode and
 307                  * get back to runtime mode in case of USB Reset.  As
 308                  * much as I dislike this, we just can't use every USB
 309                  * bus reset to switch back to runtime mode, since at
 310                  * least the Linux USB stack likes to send a number of
 311                  * resets in a row :(
 312                  */
 313                 f_dfu->dfu_state =
 314                         DFU_STATE_dfuMANIFEST_WAIT_RST;
 315                 to_runtime_mode(f_dfu);
 316                 f_dfu->dfu_state = DFU_STATE_appIDLE;
 317                 break;
 318         default:
 319                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 320                 value = RET_STALL;
 321                 break;
 322         }
 323
 324         return value;
 325 }
 326
 327 static int state_dfu_dnload_sync(struct f_dfu *f_dfu,
 328                                  const struct usb_ctrlrequest *ctrl,
 329                                  struct usb_gadget *gadget,
 330                                  struct usb_request *req)
 331 {
 332         int value = 0;
 333
 334         switch (ctrl->bRequest) {
 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         default:
 343                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 344                 value = RET_STALL;
 345                 break;
 346         }
 347
 348         return value;
 349 }
 350
 351 static int state_dfu_dnbusy(struct f_dfu *f_dfu,
 352                             const struct usb_ctrlrequest *ctrl,
 353                             struct usb_gadget *gadget,
 354                             struct usb_request *req)
 355 {
 356         int value = 0;
 357
 358         switch (ctrl->bRequest) {
 359         case USB_REQ_DFU_GETSTATUS:
 360                 handle_getstatus(req);
 361                 value = RET_STAT_LEN;
 362                 break;
 363         default:
 364                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 365                 value = RET_STALL;
 366                 break;
 367         }
 368
 369         return value;
 370 }
 371
 372 static int state_dfu_dnload_idle(struct f_dfu *f_dfu,
 373                                  const struct usb_ctrlrequest *ctrl,
 374                                  struct usb_gadget *gadget,
 375                                  struct usb_request *req)
 376 {
 377         u16 w_value = le16_to_cpu(ctrl->wValue);
 378         u16 len = le16_to_cpu(ctrl->wLength);
 379         int value = 0;
 380
 381         switch (ctrl->bRequest) {
 382         case USB_REQ_DFU_DNLOAD:
 383                 f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
 384                 f_dfu->blk_seq_num = w_value;
 385                 value = handle_dnload(gadget, len);
 386                 break;
 387         case USB_REQ_DFU_ABORT:
 388                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 389                 value = RET_ZLP;
 390                 break;
 391         case USB_REQ_DFU_GETSTATUS:
 392                 handle_getstatus(req);
 393                 value = RET_STAT_LEN;
 394                 break;
 395         case USB_REQ_DFU_GETSTATE:
 396                 handle_getstate(req);
 397                 break;
 398         default:
 399                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 400                 value = RET_STALL;
 401                 break;
 402         }
 403
 404         return value;
 405 }
 406
 407 static int state_dfu_manifest_sync(struct f_dfu *f_dfu,
 408                                    const struct usb_ctrlrequest *ctrl,
 409                                    struct usb_gadget *gadget,
 410                                    struct usb_request *req)
 411 {
 412         int value = 0;
 413
 414         switch (ctrl->bRequest) {
 415         case USB_REQ_DFU_GETSTATUS:
 416                 /* We're MainfestationTolerant */
 417                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 418                 handle_getstatus(req);
 419                 f_dfu->blk_seq_num = 0;
 420                 value = RET_STAT_LEN;
 421                 break;
 422         case USB_REQ_DFU_GETSTATE:
 423                 handle_getstate(req);
 424                 break;
 425         default:
 426                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 427                 value = RET_STALL;
 428                 break;
 429         }
 430
 431         return value;
 432 }
 433
 434 static int state_dfu_upload_idle(struct f_dfu *f_dfu,
 435                                  const struct usb_ctrlrequest *ctrl,
 436                                  struct usb_gadget *gadget,
 437                                  struct usb_request *req)
 438 {
 439         u16 w_value = le16_to_cpu(ctrl->wValue);
 440         u16 len = le16_to_cpu(ctrl->wLength);
 441         int value = 0;
 442
 443         switch (ctrl->bRequest) {
 444         case USB_REQ_DFU_UPLOAD:
 445                 /* state transition if less data then requested */
 446                 f_dfu->blk_seq_num = w_value;
 447                 value = handle_upload(req, len);
 448                 if (value >= 0 && value < len)
 449                         f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 450                 break;
 451         case USB_REQ_DFU_ABORT:
 452                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 453                 /* no zlp? */
 454                 value = RET_ZLP;
 455                 break;
 456         case USB_REQ_DFU_GETSTATUS:
 457                 handle_getstatus(req);
 458                 value = RET_STAT_LEN;
 459                 break;
 460         case USB_REQ_DFU_GETSTATE:
 461                 handle_getstate(req);
 462                 break;
 463         default:
 464                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 465                 value = RET_STALL;
 466                 break;
 467         }
 468
 469         return value;
 470 }
 471
 472 static int state_dfu_error(struct f_dfu *f_dfu,
 473                                  const struct usb_ctrlrequest *ctrl,
 474                                  struct usb_gadget *gadget,
 475                                  struct usb_request *req)
 476 {
 477         int value = 0;
 478
 479         switch (ctrl->bRequest) {
 480         case USB_REQ_DFU_GETSTATUS:
 481                 handle_getstatus(req);
 482                 value = RET_STAT_LEN;
 483                 break;
 484         case USB_REQ_DFU_GETSTATE:
 485                 handle_getstate(req);
 486                 break;
 487         case USB_REQ_DFU_CLRSTATUS:
 488                 f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 489                 f_dfu->dfu_status = DFU_STATUS_OK;
 490                 /* no zlp? */
 491                 value = RET_ZLP;
 492                 break;
 493         default:
 494                 f_dfu->dfu_state = DFU_STATE_dfuERROR;
 495                 value = RET_STALL;
 496                 break;
 497         }
 498
 499         return value;
 500 }
 501
 502 static dfu_state_fn dfu_state[] = {
 503         state_app_idle,          /* DFU_STATE_appIDLE */
 504         state_app_detach,        /* DFU_STATE_appDETACH */
 505         state_dfu_idle,          /* DFU_STATE_dfuIDLE */
 506         state_dfu_dnload_sync,   /* DFU_STATE_dfuDNLOAD_SYNC */
 507         state_dfu_dnbusy,        /* DFU_STATE_dfuDNBUSY */
 508         state_dfu_dnload_idle,   /* DFU_STATE_dfuDNLOAD_IDLE */
 509         state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */
 510         NULL,                    /* DFU_STATE_dfuMANIFEST */
 511         NULL,                    /* DFU_STATE_dfuMANIFEST_WAIT_RST */
 512         state_dfu_upload_idle,   /* DFU_STATE_dfuUPLOAD_IDLE */
 513         state_dfu_error          /* DFU_STATE_dfuERROR */
 514 };
 515
 516 static int
 517 dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 518 {
 519         struct usb_gadget *gadget = f->config->cdev->gadget;
 520         struct usb_request *req = f->config->cdev->req;
 521         struct f_dfu *f_dfu = f->config->cdev->req->context;
 522         u16 len = le16_to_cpu(ctrl->wLength);
 523         u16 w_value = le16_to_cpu(ctrl->wValue);
 524         int value = 0;
 525         u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
 526
 527         debug("w_value: 0x%x len: 0x%x\n", w_value, len);
 528         debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n",
 529                req_type, ctrl->bRequest, f_dfu->dfu_state);
 530
 531         if (req_type == USB_TYPE_STANDARD) {
 532                 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR &&
 533                     (w_value >> 8) == DFU_DT_FUNC) {
 534                         value = min(len, (u16) sizeof(dfu_func));
 535                         memcpy(req->buf, &dfu_func, value);
 536                 }
 537         } else /* DFU specific request */
 538                 value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req);
 539
 540         if (value >= 0) {
 541                 req->length = value;
 542                 req->zero = value < len;
 543                 value = usb_ep_queue(gadget->ep0, req, 0);
 544                 if (value < 0) {
 545                         debug("ep_queue --> %d\n", value);
 546                         req->status = 0;
 547                 }
 548         }
 549
 550         return value;
 551 }
 552
 553 /*-------------------------------------------------------------------------*/
 554
 555 static int
 556 dfu_prepare_strings(struct f_dfu *f_dfu, int n)
 557 {
 558         struct dfu_entity *de = NULL;
 559         int i = 0;
 560
 561         f_dfu->strings = calloc(sizeof(struct usb_string), n + 1);
 562         if (!f_dfu->strings)
 563                 goto enomem;
 564
 565         for (i = 0; i < n; ++i) {
 566                 de = dfu_get_entity(i);
 567                 f_dfu->strings[i].s = de->name;
 568         }
 569
 570         f_dfu->strings[i].id = 0;
 571         f_dfu->strings[i].s = NULL;
 572
 573         return 0;
 574
 575 enomem:
 576         while (i)
 577                 f_dfu->strings[--i].s = NULL;
 578
 579         free(f_dfu->strings);
 580
 581         return -ENOMEM;
 582 }
 583
 584 static int dfu_prepare_function(struct f_dfu *f_dfu, int n)
 585 {
 586         struct usb_interface_descriptor *d;
 587         int i = 0;
 588
 589         f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n);
 590         if (!f_dfu->function)
 591                 goto enomem;
 592
 593         for (i = 0; i < n; ++i) {
 594                 d = calloc(sizeof(*d), 1);
 595                 if (!d)
 596                         goto enomem;
 597
 598                 d->bLength =            sizeof(*d);
 599                 d->bDescriptorType =    USB_DT_INTERFACE;
 600                 d->bAlternateSetting =  i;
 601                 d->bNumEndpoints =      0;
 602                 d->bInterfaceClass =    USB_CLASS_APP_SPEC;
 603                 d->bInterfaceSubClass = 1;
 604                 d->bInterfaceProtocol = 2;
 605
 606                 f_dfu->function[i] = (struct usb_descriptor_header *)d;
 607         }
 608         f_dfu->function[i] = NULL;
 609
 610         return 0;
 611
 612 enomem:
 613         while (i) {
 614                 free(f_dfu->function[--i]);
 615                 f_dfu->function[i] = NULL;
 616         }
 617         free(f_dfu->function);
 618
 619         return -ENOMEM;
 620 }
 621
 622 static int dfu_bind(struct usb_configuration *c, struct usb_function *f)
 623 {
 624         struct usb_composite_dev *cdev = c->cdev;
 625         struct f_dfu *f_dfu = func_to_dfu(f);
 626         int alt_num = dfu_get_alt_number();
 627         int rv, id, i;
 628
 629         id = usb_interface_id(c, f);
 630         if (id < 0)
 631                 return id;
 632         dfu_intf_runtime.bInterfaceNumber = id;
 633
 634         f_dfu->dfu_state = DFU_STATE_appIDLE;
 635         f_dfu->dfu_status = DFU_STATUS_OK;
 636
 637         rv = dfu_prepare_function(f_dfu, alt_num);
 638         if (rv)
 639                 goto error;
 640
 641         rv = dfu_prepare_strings(f_dfu, alt_num);
 642         if (rv)
 643                 goto error;
 644         for (i = 0; i < alt_num; i++) {
 645                 id = usb_string_id(cdev);
 646                 if (id < 0)
 647                         return id;
 648                 f_dfu->strings[i].id = id;
 649                 ((struct usb_interface_descriptor *)f_dfu->function[i])
 650                         ->iInterface = id;
 651         }
 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 }