sys/dev/usb/usb_msctest.c

   1 /* $FreeBSD$ */
   2 /*-
   3  * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * The following file contains code that will detect USB autoinstall
  29  * disks.
  30  *
  31  * TODO: Potentially we could add code to automatically detect USB
  32  * mass storage quirks for not supported SCSI commands!
  33  */
  34
  35 #include <sys/stdint.h>
  36 #include <sys/stddef.h>
  37 #include <sys/param.h>
  38 #include <sys/queue.h>
  39 #include <sys/types.h>
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/bus.h>
  43 #include <sys/module.h>
  44 #include <sys/lock.h>
  45 #include <sys/mutex.h>
  46 #include <sys/condvar.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/sx.h>
  49 #include <sys/unistd.h>
  50 #include <sys/callout.h>
  51 #include <sys/malloc.h>
  52 #include <sys/priv.h>
  53
  54 #include <dev/usb/usb.h>
  55 #include <dev/usb/usbdi.h>
  56 #include <dev/usb/usbdi_util.h>
  57
  58 #define USB_DEBUG_VAR usb_debug
  59
  60 #include <dev/usb/usb_busdma.h>
  61 #include <dev/usb/usb_process.h>
  62 #include <dev/usb/usb_transfer.h>
  63 #include <dev/usb/usb_msctest.h>
  64 #include <dev/usb/usb_debug.h>
  65 #include <dev/usb/usb_busdma.h>
  66 #include <dev/usb/usb_device.h>
  67 #include <dev/usb/usb_request.h>
  68 #include <dev/usb/usb_util.h>
  69 #include <dev/usb/quirk/usb_quirk.h>
  70
  71 enum {
  72         ST_COMMAND,
  73         ST_DATA_RD,
  74         ST_DATA_RD_CS,
  75         ST_DATA_WR,
  76         ST_DATA_WR_CS,
  77         ST_STATUS,
  78         ST_MAX,
  79 };
  80
  81 enum {
  82         DIR_IN,
  83         DIR_OUT,
  84         DIR_NONE,
  85 };
  86
  87 #define SCSI_INQ_LEN    0x24
  88 static uint8_t scsi_test_unit_ready[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  89 static uint8_t scsi_inquiry[] = { 0x12, 0x00, 0x00, 0x00, SCSI_INQ_LEN, 0x00 };
  90 static uint8_t scsi_rezero_init[] =     { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
  91 static uint8_t scsi_start_stop_unit[] = { 0x1b, 0x00, 0x00, 0x00, 0x02, 0x00 };
  92 static uint8_t scsi_ztestor_eject[] =   { 0x85, 0x01, 0x01, 0x01, 0x18, 0x01,
  93                                           0x01, 0x01, 0x01, 0x01, 0x00, 0x00 };
  94 static uint8_t scsi_cmotech_eject[] =   { 0xff, 0x52, 0x44, 0x45, 0x56, 0x43,
  95                                           0x48, 0x47 };
  96 static uint8_t scsi_huawei_eject[] =    { 0x11, 0x06, 0x00, 0x00, 0x00, 0x00,
  97                                           0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  98                                           0x00, 0x00, 0x00, 0x00 };
  99 static uint8_t scsi_tct_eject[] =       { 0x06, 0xf5, 0x04, 0x02, 0x52, 0x70 };
 100
 101 #define BULK_SIZE               64      /* dummy */
 102 #define ERR_CSW_FAILED          -1
 103
 104 /* Command Block Wrapper */
 105 struct bbb_cbw {
 106         uDWord  dCBWSignature;
 107 #define CBWSIGNATURE    0x43425355
 108         uDWord  dCBWTag;
 109         uDWord  dCBWDataTransferLength;
 110         uByte   bCBWFlags;
 111 #define CBWFLAGS_OUT    0x00
 112 #define CBWFLAGS_IN     0x80
 113         uByte   bCBWLUN;
 114         uByte   bCDBLength;
 115 #define CBWCDBLENGTH    16
 116         uByte   CBWCDB[CBWCDBLENGTH];
 117 } __packed;
 118
 119 /* Command Status Wrapper */
 120 struct bbb_csw {
 121         uDWord  dCSWSignature;
 122 #define CSWSIGNATURE    0x53425355
 123         uDWord  dCSWTag;
 124         uDWord  dCSWDataResidue;
 125         uByte   bCSWStatus;
 126 #define CSWSTATUS_GOOD  0x0
 127 #define CSWSTATUS_FAILED        0x1
 128 #define CSWSTATUS_PHASE 0x2
 129 } __packed;
 130
 131 struct bbb_transfer {
 132         struct mtx mtx;
 133         struct cv cv;
 134         struct bbb_cbw cbw;
 135         struct bbb_csw csw;
 136
 137         struct usb_xfer *xfer[ST_MAX];
 138
 139         uint8_t *data_ptr;
 140
 141         usb_size_t data_len;            /* bytes */
 142         usb_size_t data_rem;            /* bytes */
 143         usb_timeout_t data_timeout;     /* ms */
 144         usb_frlength_t actlen;          /* bytes */
 145
 146         uint8_t cmd_len;                /* bytes */
 147         uint8_t dir;
 148         uint8_t lun;
 149         uint8_t state;
 150         uint8_t status_try;
 151         int     error;
 152
 153         uint8_t buffer[256];
 154 };
 155
 156 static usb_callback_t bbb_command_callback;
 157 static usb_callback_t bbb_data_read_callback;
 158 static usb_callback_t bbb_data_rd_cs_callback;
 159 static usb_callback_t bbb_data_write_callback;
 160 static usb_callback_t bbb_data_wr_cs_callback;
 161 static usb_callback_t bbb_status_callback;
 162
 163 static void     bbb_done(struct bbb_transfer *, int);
 164 static void     bbb_transfer_start(struct bbb_transfer *, uint8_t);
 165 static void     bbb_data_clear_stall_callback(struct usb_xfer *, uint8_t,
 166                     uint8_t);
 167 static uint8_t bbb_command_start(struct bbb_transfer *, uint8_t, uint8_t,
 168                     void *, size_t, void *, size_t, usb_timeout_t);
 169 static struct bbb_transfer *bbb_attach(struct usb_device *, uint8_t);
 170 static void     bbb_detach(struct bbb_transfer *);
 171
 172 static const struct usb_config bbb_config[ST_MAX] = {
 173
 174         [ST_COMMAND] = {
 175                 .type = UE_BULK,
 176                 .endpoint = UE_ADDR_ANY,
 177                 .direction = UE_DIR_OUT,
 178                 .bufsize = sizeof(struct bbb_cbw),
 179                 .callback = &bbb_command_callback,
 180                 .timeout = 4 * USB_MS_HZ,       /* 4 seconds */
 181         },
 182
 183         [ST_DATA_RD] = {
 184                 .type = UE_BULK,
 185                 .endpoint = UE_ADDR_ANY,
 186                 .direction = UE_DIR_IN,
 187                 .bufsize = BULK_SIZE,
 188                 .flags = {.proxy_buffer = 1,.short_xfer_ok = 1,},
 189                 .callback = &bbb_data_read_callback,
 190                 .timeout = 4 * USB_MS_HZ,       /* 4 seconds */
 191         },
 192
 193         [ST_DATA_RD_CS] = {
 194                 .type = UE_CONTROL,
 195                 .endpoint = 0x00,       /* Control pipe */
 196                 .direction = UE_DIR_ANY,
 197                 .bufsize = sizeof(struct usb_device_request),
 198                 .callback = &bbb_data_rd_cs_callback,
 199                 .timeout = 1 * USB_MS_HZ,       /* 1 second  */
 200         },
 201
 202         [ST_DATA_WR] = {
 203                 .type = UE_BULK,
 204                 .endpoint = UE_ADDR_ANY,
 205                 .direction = UE_DIR_OUT,
 206                 .bufsize = BULK_SIZE,
 207                 .flags = {.proxy_buffer = 1,},
 208                 .callback = &bbb_data_write_callback,
 209                 .timeout = 4 * USB_MS_HZ,       /* 4 seconds */
 210         },
 211
 212         [ST_DATA_WR_CS] = {
 213                 .type = UE_CONTROL,
 214                 .endpoint = 0x00,       /* Control pipe */
 215                 .direction = UE_DIR_ANY,
 216                 .bufsize = sizeof(struct usb_device_request),
 217                 .callback = &bbb_data_wr_cs_callback,
 218                 .timeout = 1 * USB_MS_HZ,       /* 1 second  */
 219         },
 220
 221         [ST_STATUS] = {
 222                 .type = UE_BULK,
 223                 .endpoint = UE_ADDR_ANY,
 224                 .direction = UE_DIR_IN,
 225                 .bufsize = sizeof(struct bbb_csw),
 226                 .flags = {.short_xfer_ok = 1,},
 227                 .callback = &bbb_status_callback,
 228                 .timeout = 1 * USB_MS_HZ,       /* 1 second  */
 229         },
 230 };
 231
 232 static void
 233 bbb_done(struct bbb_transfer *sc, int error)
 234 {
 235
 236         sc->error = error;
 237         sc->state = ST_COMMAND;
 238         sc->status_try = 1;
 239         cv_signal(&sc->cv);
 240 }
 241
 242 static void
 243 bbb_transfer_start(struct bbb_transfer *sc, uint8_t xfer_index)
 244 {
 245         sc->state = xfer_index;
 246         usbd_transfer_start(sc->xfer[xfer_index]);
 247 }
 248
 249 static void
 250 bbb_data_clear_stall_callback(struct usb_xfer *xfer,
 251     uint8_t next_xfer, uint8_t stall_xfer)
 252 {
 253         struct bbb_transfer *sc = usbd_xfer_softc(xfer);
 254
 255         if (usbd_clear_stall_callback(xfer, sc->xfer[stall_xfer])) {
 256                 switch (USB_GET_STATE(xfer)) {
 257                 case USB_ST_SETUP:
 258                 case USB_ST_TRANSFERRED:
 259                         bbb_transfer_start(sc, next_xfer);
 260                         break;
 261                 default:
 262                         bbb_done(sc, USB_ERR_STALLED);
 263                         break;
 264                 }
 265         }
 266 }
 267
 268 static void
 269 bbb_command_callback(struct usb_xfer *xfer, usb_error_t error)
 270 {
 271         struct bbb_transfer *sc = usbd_xfer_softc(xfer);
 272         uint32_t tag;
 273
 274         switch (USB_GET_STATE(xfer)) {
 275         case USB_ST_TRANSFERRED:
 276                 bbb_transfer_start
 277                     (sc, ((sc->dir == DIR_IN) ? ST_DATA_RD :
 278                     (sc->dir == DIR_OUT) ? ST_DATA_WR :
 279                     ST_STATUS));
 280                 break;
 281
 282         case USB_ST_SETUP:
 283                 sc->status_try = 0;
 284                 tag = UGETDW(sc->cbw.dCBWTag) + 1;
 285                 USETDW(sc->cbw.dCBWSignature, CBWSIGNATURE);
 286                 USETDW(sc->cbw.dCBWTag, tag);
 287                 USETDW(sc->cbw.dCBWDataTransferLength, (uint32_t)sc->data_len);
 288                 sc->cbw.bCBWFlags = ((sc->dir == DIR_IN) ? CBWFLAGS_IN : CBWFLAGS_OUT);
 289                 sc->cbw.bCBWLUN = sc->lun;
 290                 sc->cbw.bCDBLength = sc->cmd_len;
 291                 if (sc->cbw.bCDBLength > sizeof(sc->cbw.CBWCDB)) {
 292                         sc->cbw.bCDBLength = sizeof(sc->cbw.CBWCDB);
 293                         DPRINTFN(0, "Truncating long command\n");
 294                 }
 295                 usbd_xfer_set_frame_data(xfer, 0, &sc->cbw, sizeof(sc->cbw));
 296                 usbd_transfer_submit(xfer);
 297                 break;
 298
 299         default:                        /* Error */
 300                 bbb_done(sc, error);
 301                 break;
 302         }
 303 }
 304
 305 static void
 306 bbb_data_read_callback(struct usb_xfer *xfer, usb_error_t error)
 307 {
 308         struct bbb_transfer *sc = usbd_xfer_softc(xfer);
 309         usb_frlength_t max_bulk = usbd_xfer_max_len(xfer);
 310         int actlen, sumlen;
 311
 312         usbd_xfer_status(xfer, &actlen, &sumlen, NULL, NULL);
 313
 314         switch (USB_GET_STATE(xfer)) {
 315         case USB_ST_TRANSFERRED:
 316                 sc->data_rem -= actlen;
 317                 sc->data_ptr += actlen;
 318                 sc->actlen += actlen;
 319
 320                 if (actlen < sumlen) {
 321                         /* short transfer */
 322                         sc->data_rem = 0;
 323                 }
 324         case USB_ST_SETUP:
 325                 DPRINTF("max_bulk=%d, data_rem=%d\n",
 326                     max_bulk, sc->data_rem);
 327
 328                 if (sc->data_rem == 0) {
 329                         bbb_transfer_start(sc, ST_STATUS);
 330                         break;
 331                 }
 332                 if (max_bulk > sc->data_rem) {
 333                         max_bulk = sc->data_rem;
 334                 }
 335                 usbd_xfer_set_timeout(xfer, sc->data_timeout);
 336                 usbd_xfer_set_frame_data(xfer, 0, sc->data_ptr, max_bulk);
 337                 usbd_transfer_submit(xfer);
 338                 break;
 339
 340         default:                        /* Error */
 341                 if (error == USB_ERR_CANCELLED) {
 342                         bbb_done(sc, error);
 343                 } else {
 344                         bbb_transfer_start(sc, ST_DATA_RD_CS);
 345                 }
 346                 break;
 347         }
 348 }
 349
 350 static void
 351 bbb_data_rd_cs_callback(struct usb_xfer *xfer, usb_error_t error)
 352 {
 353         bbb_data_clear_stall_callback(xfer, ST_STATUS,
 354             ST_DATA_RD);
 355 }
 356
 357 static void
 358 bbb_data_write_callback(struct usb_xfer *xfer, usb_error_t error)
 359 {
 360         struct bbb_transfer *sc = usbd_xfer_softc(xfer);
 361         usb_frlength_t max_bulk = usbd_xfer_max_len(xfer);
 362         int actlen, sumlen;
 363
 364         usbd_xfer_status(xfer, &actlen, &sumlen, NULL, NULL);
 365
 366         switch (USB_GET_STATE(xfer)) {
 367         case USB_ST_TRANSFERRED:
 368                 sc->data_rem -= actlen;
 369                 sc->data_ptr += actlen;
 370                 sc->actlen += actlen;
 371
 372                 if (actlen < sumlen) {
 373                         /* short transfer */
 374                         sc->data_rem = 0;
 375                 }
 376         case USB_ST_SETUP:
 377                 DPRINTF("max_bulk=%d, data_rem=%d\n",
 378                     max_bulk, sc->data_rem);
 379
 380                 if (sc->data_rem == 0) {
 381                         bbb_transfer_start(sc, ST_STATUS);
 382                         return;
 383                 }
 384                 if (max_bulk > sc->data_rem) {
 385                         max_bulk = sc->data_rem;
 386                 }
 387                 usbd_xfer_set_timeout(xfer, sc->data_timeout);
 388                 usbd_xfer_set_frame_data(xfer, 0, sc->data_ptr, max_bulk);
 389                 usbd_transfer_submit(xfer);
 390                 return;
 391
 392         default:                        /* Error */
 393                 if (error == USB_ERR_CANCELLED) {
 394                         bbb_done(sc, error);
 395                 } else {
 396                         bbb_transfer_start(sc, ST_DATA_WR_CS);
 397                 }
 398                 return;
 399
 400         }
 401 }
 402
 403 static void
 404 bbb_data_wr_cs_callback(struct usb_xfer *xfer, usb_error_t error)
 405 {
 406         bbb_data_clear_stall_callback(xfer, ST_STATUS,
 407             ST_DATA_WR);
 408 }
 409
 410 static void
 411 bbb_status_callback(struct usb_xfer *xfer, usb_error_t error)
 412 {
 413         struct bbb_transfer *sc = usbd_xfer_softc(xfer);
 414         int actlen, sumlen;
 415
 416         usbd_xfer_status(xfer, &actlen, &sumlen, NULL, NULL);
 417
 418         switch (USB_GET_STATE(xfer)) {
 419         case USB_ST_TRANSFERRED:
 420
 421                 /* very simple status check */
 422
 423                 if (actlen < sizeof(sc->csw)) {
 424                         bbb_done(sc, USB_ERR_SHORT_XFER);
 425                 } else if (sc->csw.bCSWStatus == CSWSTATUS_GOOD) {
 426                         bbb_done(sc, 0);        /* success */
 427                 } else {
 428                         bbb_done(sc, ERR_CSW_FAILED);   /* error */
 429                 }
 430                 break;
 431
 432         case USB_ST_SETUP:
 433                 usbd_xfer_set_frame_data(xfer, 0, &sc->csw, sizeof(sc->csw));
 434                 usbd_transfer_submit(xfer);
 435                 break;
 436
 437         default:
 438                 DPRINTF("Failed to read CSW: %s, try %d\n",
 439                     usbd_errstr(error), sc->status_try);
 440
 441                 if (error == USB_ERR_CANCELLED || sc->status_try) {
 442                         bbb_done(sc, error);
 443                 } else {
 444                         sc->status_try = 1;
 445                         bbb_transfer_start(sc, ST_DATA_RD_CS);
 446                 }
 447                 break;
 448         }
 449 }
 450
 451 /*------------------------------------------------------------------------*
 452  *      bbb_command_start - execute a SCSI command synchronously
 453  *
 454  * Return values
 455  * 0: Success
 456  * Else: Failure
 457  *------------------------------------------------------------------------*/
 458 static uint8_t
 459 bbb_command_start(struct bbb_transfer *sc, uint8_t dir, uint8_t lun,
 460     void *data_ptr, size_t data_len, void *cmd_ptr, size_t cmd_len,
 461     usb_timeout_t data_timeout)
 462 {
 463         sc->lun = lun;
 464         sc->dir = data_len ? dir : DIR_NONE;
 465         sc->data_ptr = data_ptr;
 466         sc->data_len = data_len;
 467         sc->data_rem = data_len;
 468         sc->data_timeout = (data_timeout + USB_MS_HZ);
 469         sc->actlen = 0;
 470         sc->cmd_len = cmd_len;
 471         bzero(&sc->cbw.CBWCDB, sizeof(sc->cbw.CBWCDB));
 472         bcopy(cmd_ptr, &sc->cbw.CBWCDB, cmd_len);
 473         DPRINTFN(1, "SCSI cmd = %*D\n", (int)cmd_len, &sc->cbw.CBWCDB, ":");
 474
 475         mtx_lock(&sc->mtx);
 476         usbd_transfer_start(sc->xfer[sc->state]);
 477
 478         while (usbd_transfer_pending(sc->xfer[sc->state])) {
 479                 cv_wait(&sc->cv, &sc->mtx);
 480         }
 481         mtx_unlock(&sc->mtx);
 482         return (sc->error);
 483 }
 484
 485 static struct bbb_transfer *
 486 bbb_attach(struct usb_device *udev, uint8_t iface_index)
 487 {
 488         struct usb_interface *iface;
 489         struct usb_interface_descriptor *id;
 490         struct bbb_transfer *sc;
 491         usb_error_t err;
 492
 493         iface = usbd_get_iface(udev, iface_index);
 494         if (iface == NULL)
 495                 return (NULL);
 496
 497         id = iface->idesc;
 498         if (id == NULL || id->bInterfaceClass != UICLASS_MASS)
 499                 return (NULL);
 500
 501         switch (id->bInterfaceSubClass) {
 502         case UISUBCLASS_SCSI:
 503         case UISUBCLASS_UFI:
 504         case UISUBCLASS_SFF8020I:
 505         case UISUBCLASS_SFF8070I:
 506                 break;
 507         default:
 508                 return (NULL);
 509         }
 510
 511         switch (id->bInterfaceProtocol) {
 512         case UIPROTO_MASS_BBB_OLD:
 513         case UIPROTO_MASS_BBB:
 514                 break;
 515         default:
 516                 return (NULL);
 517         }
 518
 519         sc = malloc(sizeof(*sc), M_USB, M_WAITOK | M_ZERO);
 520         mtx_init(&sc->mtx, "USB autoinstall", NULL, MTX_DEF);
 521         cv_init(&sc->cv, "WBBB");
 522
 523         err = usbd_transfer_setup(udev, &iface_index, sc->xfer, bbb_config,
 524             ST_MAX, sc, &sc->mtx);
 525         if (err) {
 526                 bbb_detach(sc);
 527                 return (NULL);
 528         }
 529         return (sc);
 530 }
 531
 532 static void
 533 bbb_detach(struct bbb_transfer *sc)
 534 {
 535         usbd_transfer_unsetup(sc->xfer, ST_MAX);
 536         mtx_destroy(&sc->mtx);
 537         cv_destroy(&sc->cv);
 538         free(sc, M_USB);
 539 }
 540
 541 /*------------------------------------------------------------------------*
 542  *      usb_iface_is_cdrom
 543  *
 544  * Return values:
 545  * 1: This interface is an auto install disk (CD-ROM)
 546  * 0: Not an auto install disk.
 547  *------------------------------------------------------------------------*/
 548 int
 549 usb_iface_is_cdrom(struct usb_device *udev, uint8_t iface_index)
 550 {
 551         struct bbb_transfer *sc;
 552         usb_error_t err;
 553         uint8_t timeout, is_cdrom;
 554         uint8_t sid_type;
 555
 556         sc = bbb_attach(udev, iface_index);
 557         if (sc == NULL)
 558                 return (0);
 559
 560         is_cdrom = 0;
 561         timeout = 4;    /* tries */
 562         while (--timeout) {
 563                 err = bbb_command_start(sc, DIR_IN, 0, sc->buffer,
 564                     SCSI_INQ_LEN, &scsi_inquiry, sizeof(scsi_inquiry),
 565                     USB_MS_HZ);
 566
 567                 if (err == 0 && sc->actlen > 0) {
 568                         sid_type = sc->buffer[0] & 0x1F;
 569                         if (sid_type == 0x05)
 570                                 is_cdrom = 1;
 571                         break;
 572                 } else if (err != ERR_CSW_FAILED)
 573                         break;  /* non retryable error */
 574                 usb_pause_mtx(NULL, hz);
 575         }
 576         bbb_detach(sc);
 577         return (is_cdrom);
 578 }
 579
 580 usb_error_t
 581 usb_msc_eject(struct usb_device *udev, uint8_t iface_index, int method)
 582 {
 583         struct bbb_transfer *sc;
 584         usb_error_t err;
 585
 586         sc = bbb_attach(udev, iface_index);
 587         if (sc == NULL)
 588                 return (USB_ERR_INVAL);
 589
 590         err = 0;
 591         switch (method) {
 592         case MSC_EJECT_STOPUNIT:
 593                 err = bbb_command_start(sc, DIR_IN, 0, NULL, 0,
 594                     &scsi_test_unit_ready, sizeof(scsi_test_unit_ready),
 595                     USB_MS_HZ);
 596                 DPRINTF("Test unit ready status: %s\n", usbd_errstr(err));
 597                 err = bbb_command_start(sc, DIR_IN, 0, NULL, 0,
 598                     &scsi_start_stop_unit, sizeof(scsi_start_stop_unit),
 599                     USB_MS_HZ);
 600                 break;
 601         case MSC_EJECT_REZERO:
 602                 err = bbb_command_start(sc, DIR_IN, 0, NULL, 0,
 603                     &scsi_rezero_init, sizeof(scsi_rezero_init),
 604                     USB_MS_HZ);
 605                 break;
 606         case MSC_EJECT_ZTESTOR:
 607                 err = bbb_command_start(sc, DIR_IN, 0, NULL, 0,
 608                     &scsi_ztestor_eject, sizeof(scsi_ztestor_eject),
 609                     USB_MS_HZ);
 610                 break;
 611         case MSC_EJECT_CMOTECH:
 612                 err = bbb_command_start(sc, DIR_IN, 0, NULL, 0,
 613                     &scsi_cmotech_eject, sizeof(scsi_cmotech_eject),
 614                     USB_MS_HZ);
 615                 break;
 616         case MSC_EJECT_HUAWEI:
 617                 err = bbb_command_start(sc, DIR_IN, 0, NULL, 0,
 618                     &scsi_huawei_eject, sizeof(scsi_huawei_eject),
 619                     USB_MS_HZ);
 620                 break;
 621         case MSC_EJECT_TCT:
 622                 /*
 623                  * TCTMobile needs DIR_IN flag. To get it, we
 624                  * supply a dummy data with the command.
 625                  */
 626                 err = bbb_command_start(sc, DIR_IN, 0, &sc->buffer,
 627                     sizeof(sc->buffer), &scsi_tct_eject,
 628                     sizeof(scsi_tct_eject), USB_MS_HZ);
 629                 break;
 630         default:
 631                 printf("usb_msc_eject: unknown eject method (%d)\n", method);
 632                 break;
 633         }
 634         DPRINTF("Eject CD command status: %s\n", usbd_errstr(err));
 635
 636         bbb_detach(sc);
 637         return (0);
 638 }