drivers/usb/storage/jumpshot.c

   1 /* Driver for Lexar "Jumpshot" Compact Flash reader
   2  *
   3  * $Id: jumpshot.c,v 1.7 2002/02/25 00:40:13 mdharm Exp $
   4  *
   5  * jumpshot driver v0.1:
   6  *
   7  * First release
   8  *
   9  * Current development and maintenance by:
  10  *   (c) 2000 Jimmie Mayfield (mayfield+usb@sackheads.org)
  11  *
  12  *   Many thanks to Robert Baruch for the SanDisk SmartMedia reader driver
  13  *   which I used as a template for this driver.
  14  *
  15  *   Some bugfixes and scatter-gather code by Gregory P. Smith
  16  *   (greg-usb@electricrain.com)
  17  *
  18  *   Fix for media change by Joerg Schneider (js@joergschneider.com)
  19  *
  20  * Developed with the assistance of:
  21  *
  22  *   (C) 2002 Alan Stern <stern@rowland.org>
  23  *
  24  * This program is free software; you can redistribute it and/or modify it
  25  * under the terms of the GNU General Public License as published by the
  26  * Free Software Foundation; either version 2, or (at your option) any
  27  * later version.
  28  *
  29  * This program is distributed in the hope that it will be useful, but
  30  * WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  32  * General Public License for more details.
  33  *
  34  * You should have received a copy of the GNU General Public License along
  35  * with this program; if not, write to the Free Software Foundation, Inc.,
  36  * 675 Mass Ave, Cambridge, MA 02139, USA.
  37  */
  38
  39  /*
  40   * This driver attempts to support the Lexar Jumpshot USB CompactFlash
  41   * reader.  Like many other USB CompactFlash readers, the Jumpshot contains
  42   * a USB-to-ATA chip.
  43   *
  44   * This driver supports reading and writing.  If you're truly paranoid,
  45   * however, you can force the driver into a write-protected state by setting
  46   * the WP enable bits in jumpshot_handle_mode_sense.  See the comments
  47   * in that routine.
  48   */
  49
  50 #include <linux/sched.h>
  51 #include <linux/errno.h>
  52 #include <linux/slab.h>
  53
  54 #include <scsi/scsi.h>
  55 #include <scsi/scsi_cmnd.h>
  56
  57 #include "usb.h"
  58 #include "transport.h"
  59 #include "protocol.h"
  60 #include "debug.h"
  61 #include "jumpshot.h"
  62
  63
  64 static inline int jumpshot_bulk_read(struct us_data *us,
  65                                      unsigned char *data,
  66                                      unsigned int len)
  67 {
  68         if (len == 0)
  69                 return USB_STOR_XFER_GOOD;
  70
  71         US_DEBUGP("jumpshot_bulk_read:  len = %d\n", len);
  72         return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
  73                         data, len, NULL);
  74 }
  75
  76
  77 static inline int jumpshot_bulk_write(struct us_data *us,
  78                                       unsigned char *data,
  79                                       unsigned int len)
  80 {
  81         if (len == 0)
  82                 return USB_STOR_XFER_GOOD;
  83
  84         US_DEBUGP("jumpshot_bulk_write:  len = %d\n", len);
  85         return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
  86                         data, len, NULL);
  87 }
  88
  89
  90 static int jumpshot_get_status(struct us_data  *us)
  91 {
  92         int rc;
  93
  94         if (!us)
  95                 return USB_STOR_TRANSPORT_ERROR;
  96
  97         // send the setup
  98         rc = usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe,
  99                                    0, 0xA0, 0, 7, us->iobuf, 1);
 100
 101         if (rc != USB_STOR_XFER_GOOD)
 102                 return USB_STOR_TRANSPORT_ERROR;
 103
 104         if (us->iobuf[0] != 0x50) {
 105                 US_DEBUGP("jumpshot_get_status:  0x%2x\n",
 106                           us->iobuf[0]);
 107                 return USB_STOR_TRANSPORT_ERROR;
 108         }
 109
 110         return USB_STOR_TRANSPORT_GOOD;
 111 }
 112
 113 static int jumpshot_read_data(struct us_data *us,
 114                               struct jumpshot_info *info,
 115                               u32 sector,
 116                               u32 sectors)
 117 {
 118         unsigned char *command = us->iobuf;
 119         unsigned char *buffer;
 120         unsigned char  thistime;
 121         unsigned int totallen, alloclen;
 122         int len, result;
 123         unsigned int sg_idx = 0, sg_offset = 0;
 124
 125         // we're working in LBA mode.  according to the ATA spec,
 126         // we can support up to 28-bit addressing.  I don't know if Jumpshot
 127         // supports beyond 24-bit addressing.  It's kind of hard to test
 128         // since it requires > 8GB CF card.
 129
 130         if (sector > 0x0FFFFFFF)
 131                 return USB_STOR_TRANSPORT_ERROR;
 132
 133         totallen = sectors * info->ssize;
 134
 135         // Since we don't read more than 64 KB at a time, we have to create
 136         // a bounce buffer and move the data a piece at a time between the
 137         // bounce buffer and the actual transfer buffer.
 138
 139         alloclen = min(totallen, 65536u);
 140         buffer = kmalloc(alloclen, GFP_NOIO);
 141         if (buffer == NULL)
 142                 return USB_STOR_TRANSPORT_ERROR;
 143
 144         do {
 145                 // loop, never allocate or transfer more than 64k at once
 146                 // (min(128k, 255*info->ssize) is the real limit)
 147                 len = min(totallen, alloclen);
 148                 thistime = (len / info->ssize) & 0xff;
 149
 150                 command[0] = 0;
 151                 command[1] = thistime;
 152                 command[2] = sector & 0xFF;
 153                 command[3] = (sector >>  8) & 0xFF;
 154                 command[4] = (sector >> 16) & 0xFF;
 155
 156                 command[5] = 0xE0 | ((sector >> 24) & 0x0F);
 157                 command[6] = 0x20;
 158
 159                 // send the setup + command
 160                 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 161                                                0, 0x20, 0, 1, command, 7);
 162                 if (result != USB_STOR_XFER_GOOD)
 163                         goto leave;
 164
 165                 // read the result
 166                 result = jumpshot_bulk_read(us, buffer, len);
 167                 if (result != USB_STOR_XFER_GOOD)
 168                         goto leave;
 169
 170                 US_DEBUGP("jumpshot_read_data:  %d bytes\n", len);
 171
 172                 // Store the data in the transfer buffer
 173                 usb_stor_access_xfer_buf(buffer, len, us->srb,
 174                                  &sg_idx, &sg_offset, TO_XFER_BUF);
 175
 176                 sector += thistime;
 177                 totallen -= len;
 178         } while (totallen > 0);
 179
 180         kfree(buffer);
 181         return USB_STOR_TRANSPORT_GOOD;
 182
 183  leave:
 184         kfree(buffer);
 185         return USB_STOR_TRANSPORT_ERROR;
 186 }
 187
 188
 189 static int jumpshot_write_data(struct us_data *us,
 190                                struct jumpshot_info *info,
 191                                u32 sector,
 192                                u32 sectors)
 193 {
 194         unsigned char *command = us->iobuf;
 195         unsigned char *buffer;
 196         unsigned char  thistime;
 197         unsigned int totallen, alloclen;
 198         int len, result, waitcount;
 199         unsigned int sg_idx = 0, sg_offset = 0;
 200
 201         // we're working in LBA mode.  according to the ATA spec,
 202         // we can support up to 28-bit addressing.  I don't know if Jumpshot
 203         // supports beyond 24-bit addressing.  It's kind of hard to test
 204         // since it requires > 8GB CF card.
 205         //
 206         if (sector > 0x0FFFFFFF)
 207                 return USB_STOR_TRANSPORT_ERROR;
 208
 209         totallen = sectors * info->ssize;
 210
 211         // Since we don't write more than 64 KB at a time, we have to create
 212         // a bounce buffer and move the data a piece at a time between the
 213         // bounce buffer and the actual transfer buffer.
 214
 215         alloclen = min(totallen, 65536u);
 216         buffer = kmalloc(alloclen, GFP_NOIO);
 217         if (buffer == NULL)
 218                 return USB_STOR_TRANSPORT_ERROR;
 219
 220         do {
 221                 // loop, never allocate or transfer more than 64k at once
 222                 // (min(128k, 255*info->ssize) is the real limit)
 223
 224                 len = min(totallen, alloclen);
 225                 thistime = (len / info->ssize) & 0xff;
 226
 227                 // Get the data from the transfer buffer
 228                 usb_stor_access_xfer_buf(buffer, len, us->srb,
 229                                 &sg_idx, &sg_offset, FROM_XFER_BUF);
 230
 231                 command[0] = 0;
 232                 command[1] = thistime;
 233                 command[2] = sector & 0xFF;
 234                 command[3] = (sector >>  8) & 0xFF;
 235                 command[4] = (sector >> 16) & 0xFF;
 236
 237                 command[5] = 0xE0 | ((sector >> 24) & 0x0F);
 238                 command[6] = 0x30;
 239
 240                 // send the setup + command
 241                 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 242                         0, 0x20, 0, 1, command, 7);
 243                 if (result != USB_STOR_XFER_GOOD)
 244                         goto leave;
 245
 246                 // send the data
 247                 result = jumpshot_bulk_write(us, buffer, len);
 248                 if (result != USB_STOR_XFER_GOOD)
 249                         goto leave;
 250
 251                 // read the result.  apparently the bulk write can complete
 252                 // before the jumpshot drive is finished writing.  so we loop
 253                 // here until we get a good return code
 254                 waitcount = 0;
 255                 do {
 256                         result = jumpshot_get_status(us);
 257                         if (result != USB_STOR_TRANSPORT_GOOD) {
 258                                 // I have not experimented to find the smallest value.
 259                                 //
 260                                 msleep(50);
 261                         }
 262                 } while ((result != USB_STOR_TRANSPORT_GOOD) && (waitcount < 10));
 263
 264                 if (result != USB_STOR_TRANSPORT_GOOD)
 265                         US_DEBUGP("jumpshot_write_data:  Gah!  Waitcount = 10.  Bad write!?\n");
 266
 267                 sector += thistime;
 268                 totallen -= len;
 269         } while (totallen > 0);
 270
 271         kfree(buffer);
 272         return result;
 273
 274  leave:
 275         kfree(buffer);
 276         return USB_STOR_TRANSPORT_ERROR;
 277 }
 278
 279 static int jumpshot_id_device(struct us_data *us,
 280                               struct jumpshot_info *info)
 281 {
 282         unsigned char *command = us->iobuf;
 283         unsigned char *reply;
 284         int      rc;
 285
 286         if (!us || !info)
 287                 return USB_STOR_TRANSPORT_ERROR;
 288
 289         command[0] = 0xE0;
 290         command[1] = 0xEC;
 291         reply = kmalloc(512, GFP_NOIO);
 292         if (!reply)
 293                 return USB_STOR_TRANSPORT_ERROR;
 294
 295         // send the setup
 296         rc = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 297                                    0, 0x20, 0, 6, command, 2);
 298
 299         if (rc != USB_STOR_XFER_GOOD) {
 300                 US_DEBUGP("jumpshot_id_device:  Gah! "
 301                           "send_control for read_capacity failed\n");
 302                 rc = USB_STOR_TRANSPORT_ERROR;
 303                 goto leave;
 304         }
 305
 306         // read the reply
 307         rc = jumpshot_bulk_read(us, reply, 512);
 308         if (rc != USB_STOR_XFER_GOOD) {
 309                 rc = USB_STOR_TRANSPORT_ERROR;
 310                 goto leave;
 311         }
 312
 313         info->sectors = ((u32)(reply[117]) << 24) |
 314                         ((u32)(reply[116]) << 16) |
 315                         ((u32)(reply[115]) <<  8) |
 316                         ((u32)(reply[114])      );
 317
 318         rc = USB_STOR_TRANSPORT_GOOD;
 319
 320  leave:
 321         kfree(reply);
 322         return rc;
 323 }
 324
 325 static int jumpshot_handle_mode_sense(struct us_data *us,
 326                                       struct scsi_cmnd * srb,
 327                                       int sense_6)
 328 {
 329         static unsigned char rw_err_page[12] = {
 330                 0x1, 0xA, 0x21, 1, 0, 0, 0, 0, 1, 0, 0, 0
 331         };
 332         static unsigned char cache_page[12] = {
 333                 0x8, 0xA, 0x1, 0, 0, 0, 0, 0, 0, 0, 0, 0
 334         };
 335         static unsigned char rbac_page[12] = {
 336                 0x1B, 0xA, 0, 0x81, 0, 0, 0, 0, 0, 0, 0, 0
 337         };
 338         static unsigned char timer_page[8] = {
 339                 0x1C, 0x6, 0, 0, 0, 0
 340         };
 341         unsigned char pc, page_code;
 342         unsigned int i = 0;
 343         struct jumpshot_info *info = (struct jumpshot_info *) (us->extra);
 344         unsigned char *ptr = us->iobuf;
 345
 346         pc = srb->cmnd[2] >> 6;
 347         page_code = srb->cmnd[2] & 0x3F;
 348
 349         switch (pc) {
 350            case 0x0:
 351                 US_DEBUGP("jumpshot_handle_mode_sense:  Current values\n");
 352                 break;
 353            case 0x1:
 354                 US_DEBUGP("jumpshot_handle_mode_sense:  Changeable values\n");
 355                 break;
 356            case 0x2:
 357                 US_DEBUGP("jumpshot_handle_mode_sense:  Default values\n");
 358                 break;
 359            case 0x3:
 360                 US_DEBUGP("jumpshot_handle_mode_sense:  Saves values\n");
 361                 break;
 362         }
 363
 364         memset(ptr, 0, 8);
 365         if (sense_6) {
 366                 ptr[2] = 0x00;          // WP enable: 0x80
 367                 i = 4;
 368         } else {
 369                 ptr[3] = 0x00;          // WP enable: 0x80
 370                 i = 8;
 371         }
 372
 373         switch (page_code) {
 374            case 0x0:
 375                 // vendor-specific mode
 376                 info->sense_key = 0x05;
 377                 info->sense_asc = 0x24;
 378                 info->sense_ascq = 0x00;
 379                 return USB_STOR_TRANSPORT_FAILED;
 380
 381            case 0x1:
 382                 memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
 383                 i += sizeof(rw_err_page);
 384                 break;
 385
 386            case 0x8:
 387                 memcpy(ptr + i, cache_page, sizeof(cache_page));
 388                 i += sizeof(cache_page);
 389                 break;
 390
 391            case 0x1B:
 392                 memcpy(ptr + i, rbac_page, sizeof(rbac_page));
 393                 i += sizeof(rbac_page);
 394                 break;
 395
 396            case 0x1C:
 397                 memcpy(ptr + i, timer_page, sizeof(timer_page));
 398                 i += sizeof(timer_page);
 399                 break;
 400
 401            case 0x3F:
 402                 memcpy(ptr + i, timer_page, sizeof(timer_page));
 403                 i += sizeof(timer_page);
 404                 memcpy(ptr + i, rbac_page, sizeof(rbac_page));
 405                 i += sizeof(rbac_page);
 406                 memcpy(ptr + i, cache_page, sizeof(cache_page));
 407                 i += sizeof(cache_page);
 408                 memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
 409                 i += sizeof(rw_err_page);
 410                 break;
 411         }
 412
 413         if (sense_6)
 414                 ptr[0] = i - 1;
 415         else
 416                 ((__be16 *) ptr)[0] = cpu_to_be16(i - 2);
 417         usb_stor_set_xfer_buf(ptr, i, srb);
 418
 419         return USB_STOR_TRANSPORT_GOOD;
 420 }
 421
 422
 423 static void jumpshot_info_destructor(void *extra)
 424 {
 425         // this routine is a placeholder...
 426         // currently, we don't allocate any extra blocks so we're okay
 427 }
 428
 429
 430
 431 // Transport for the Lexar 'Jumpshot'
 432 //
 433 int jumpshot_transport(struct scsi_cmnd * srb, struct us_data *us)
 434 {
 435         struct jumpshot_info *info;
 436         int rc;
 437         unsigned long block, blocks;
 438         unsigned char *ptr = us->iobuf;
 439         static unsigned char inquiry_response[8] = {
 440                 0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
 441         };
 442
 443         if (!us->extra) {
 444                 us->extra = kmalloc(sizeof(struct jumpshot_info), GFP_NOIO);
 445                 if (!us->extra) {
 446                         US_DEBUGP("jumpshot_transport:  Gah! Can't allocate storage for jumpshot info struct!\n");
 447                         return USB_STOR_TRANSPORT_ERROR;
 448                 }
 449                 memset(us->extra, 0, sizeof(struct jumpshot_info));
 450                 us->extra_destructor = jumpshot_info_destructor;
 451         }
 452
 453         info = (struct jumpshot_info *) (us->extra);
 454
 455         if (srb->cmnd[0] == INQUIRY) {
 456                 US_DEBUGP("jumpshot_transport:  INQUIRY.  Returning bogus response.\n");
 457                 memcpy(ptr, inquiry_response, sizeof(inquiry_response));
 458                 fill_inquiry_response(us, ptr, 36);
 459                 return USB_STOR_TRANSPORT_GOOD;
 460         }
 461
 462         if (srb->cmnd[0] == READ_CAPACITY) {
 463                 info->ssize = 0x200;  // hard coded 512 byte sectors as per ATA spec
 464
 465                 rc = jumpshot_get_status(us);
 466                 if (rc != USB_STOR_TRANSPORT_GOOD)
 467                         return rc;
 468
 469                 rc = jumpshot_id_device(us, info);
 470                 if (rc != USB_STOR_TRANSPORT_GOOD)
 471                         return rc;
 472
 473                 US_DEBUGP("jumpshot_transport:  READ_CAPACITY:  %ld sectors, %ld bytes per sector\n",
 474                           info->sectors, info->ssize);
 475
 476                 // build the reply
 477                 //
 478                 ((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
 479                 ((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
 480                 usb_stor_set_xfer_buf(ptr, 8, srb);
 481
 482                 return USB_STOR_TRANSPORT_GOOD;
 483         }
 484
 485         if (srb->cmnd[0] == MODE_SELECT_10) {
 486                 US_DEBUGP("jumpshot_transport:  Gah! MODE_SELECT_10.\n");
 487                 return USB_STOR_TRANSPORT_ERROR;
 488         }
 489
 490         if (srb->cmnd[0] == READ_10) {
 491                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 492                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 493
 494                 blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));
 495
 496                 US_DEBUGP("jumpshot_transport:  READ_10: read block 0x%04lx  count %ld\n", block, blocks);
 497                 return jumpshot_read_data(us, info, block, blocks);
 498         }
 499
 500         if (srb->cmnd[0] == READ_12) {
 501                 // I don't think we'll ever see a READ_12 but support it anyway...
 502                 //
 503                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 504                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 505
 506                 blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
 507                          ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));
 508
 509                 US_DEBUGP("jumpshot_transport:  READ_12: read block 0x%04lx  count %ld\n", block, blocks);
 510                 return jumpshot_read_data(us, info, block, blocks);
 511         }
 512
 513         if (srb->cmnd[0] == WRITE_10) {
 514                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 515                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 516
 517                 blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));
 518
 519                 US_DEBUGP("jumpshot_transport:  WRITE_10: write block 0x%04lx  count %ld\n", block, blocks);
 520                 return jumpshot_write_data(us, info, block, blocks);
 521         }
 522
 523         if (srb->cmnd[0] == WRITE_12) {
 524                 // I don't think we'll ever see a WRITE_12 but support it anyway...
 525                 //
 526                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 527                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 528
 529                 blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
 530                          ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));
 531
 532                 US_DEBUGP("jumpshot_transport:  WRITE_12: write block 0x%04lx  count %ld\n", block, blocks);
 533                 return jumpshot_write_data(us, info, block, blocks);
 534         }
 535
 536
 537         if (srb->cmnd[0] == TEST_UNIT_READY) {
 538                 US_DEBUGP("jumpshot_transport:  TEST_UNIT_READY.\n");
 539                 return jumpshot_get_status(us);
 540         }
 541
 542         if (srb->cmnd[0] == REQUEST_SENSE) {
 543                 US_DEBUGP("jumpshot_transport:  REQUEST_SENSE.\n");
 544
 545                 memset(ptr, 0, 18);
 546                 ptr[0] = 0xF0;
 547                 ptr[2] = info->sense_key;
 548                 ptr[7] = 11;
 549                 ptr[12] = info->sense_asc;
 550                 ptr[13] = info->sense_ascq;
 551                 usb_stor_set_xfer_buf(ptr, 18, srb);
 552
 553                 return USB_STOR_TRANSPORT_GOOD;
 554         }
 555
 556         if (srb->cmnd[0] == MODE_SENSE) {
 557                 US_DEBUGP("jumpshot_transport:  MODE_SENSE_6 detected\n");
 558                 return jumpshot_handle_mode_sense(us, srb, 1);
 559         }
 560
 561         if (srb->cmnd[0] == MODE_SENSE_10) {
 562                 US_DEBUGP("jumpshot_transport:  MODE_SENSE_10 detected\n");
 563                 return jumpshot_handle_mode_sense(us, srb, 0);
 564         }
 565
 566         if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
 567                 // sure.  whatever.  not like we can stop the user from popping
 568                 // the media out of the device (no locking doors, etc)
 569                 //
 570                 return USB_STOR_TRANSPORT_GOOD;
 571         }
 572
 573         if (srb->cmnd[0] == START_STOP) {
 574                 /* this is used by sd.c'check_scsidisk_media_change to detect
 575                    media change */
 576                 US_DEBUGP("jumpshot_transport:  START_STOP.\n");
 577                 /* the first jumpshot_id_device after a media change returns
 578                    an error (determined experimentally) */
 579                 rc = jumpshot_id_device(us, info);
 580                 if (rc == USB_STOR_TRANSPORT_GOOD) {
 581                         info->sense_key = NO_SENSE;
 582                         srb->result = SUCCESS;
 583                 } else {
 584                         info->sense_key = UNIT_ATTENTION;
 585                         srb->result = SAM_STAT_CHECK_CONDITION;
 586                 }
 587                 return rc;
 588         }
 589
 590         US_DEBUGP("jumpshot_transport:  Gah! Unknown command: %d (0x%x)\n",
 591                   srb->cmnd[0], srb->cmnd[0]);
 592         info->sense_key = 0x05;
 593         info->sense_asc = 0x20;
 594         info->sense_ascq = 0x00;
 595         return USB_STOR_TRANSPORT_FAILED;
 596 }