drivers/usb/storage/jumpshot.c

   1 /* Driver for Lexar "Jumpshot" Compact Flash reader
   2  *
   3  * jumpshot driver v0.1:
   4  *
   5  * First release
   6  *
   7  * Current development and maintenance by:
   8  *   (c) 2000 Jimmie Mayfield (mayfield+usb@sackheads.org)
   9  *
  10  *   Many thanks to Robert Baruch for the SanDisk SmartMedia reader driver
  11  *   which I used as a template for this driver.
  12  *
  13  *   Some bugfixes and scatter-gather code by Gregory P. Smith
  14  *   (greg-usb@electricrain.com)
  15  *
  16  *   Fix for media change by Joerg Schneider (js@joergschneider.com)
  17  *
  18  * Developed with the assistance of:
  19  *
  20  *   (C) 2002 Alan Stern <stern@rowland.org>
  21  *
  22  * This program is free software; you can redistribute it and/or modify it
  23  * under the terms of the GNU General Public License as published by the
  24  * Free Software Foundation; either version 2, or (at your option) any
  25  * later version.
  26  *
  27  * This program is distributed in the hope that it will be useful, but
  28  * WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30  * General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License along
  33  * with this program; if not, write to the Free Software Foundation, Inc.,
  34  * 675 Mass Ave, Cambridge, MA 02139, USA.
  35  */
  36
  37  /*
  38   * This driver attempts to support the Lexar Jumpshot USB CompactFlash
  39   * reader.  Like many other USB CompactFlash readers, the Jumpshot contains
  40   * a USB-to-ATA chip.
  41   *
  42   * This driver supports reading and writing.  If you're truly paranoid,
  43   * however, you can force the driver into a write-protected state by setting
  44   * the WP enable bits in jumpshot_handle_mode_sense.  See the comments
  45   * in that routine.
  46   */
  47
  48 #include <linux/errno.h>
  49 #include <linux/module.h>
  50 #include <linux/slab.h>
  51
  52 #include <scsi/scsi.h>
  53 #include <scsi/scsi_cmnd.h>
  54
  55 #include "usb.h"
  56 #include "transport.h"
  57 #include "protocol.h"
  58 #include "debug.h"
  59
  60
  61 MODULE_DESCRIPTION("Driver for Lexar \"Jumpshot\" Compact Flash reader");
  62 MODULE_AUTHOR("Jimmie Mayfield <mayfield+usb@sackheads.org>");
  63 MODULE_LICENSE("GPL");
  64
  65 /*
  66  * The table of devices
  67  */
  68 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
  69                     vendorName, productName, useProtocol, useTransport, \
  70                     initFunction, flags) \
  71 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  72   .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
  73
  74 struct usb_device_id jumpshot_usb_ids[] = {
  75 #       include "unusual_jumpshot.h"
  76         { }             /* Terminating entry */
  77 };
  78 MODULE_DEVICE_TABLE(usb, jumpshot_usb_ids);
  79
  80 #undef UNUSUAL_DEV
  81
  82 /*
  83  * The flags table
  84  */
  85 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
  86                     vendor_name, product_name, use_protocol, use_transport, \
  87                     init_function, Flags) \
  88 { \
  89         .vendorName = vendor_name,      \
  90         .productName = product_name,    \
  91         .useProtocol = use_protocol,    \
  92         .useTransport = use_transport,  \
  93         .initFunction = init_function,  \
  94 }
  95
  96 static struct us_unusual_dev jumpshot_unusual_dev_list[] = {
  97 #       include "unusual_jumpshot.h"
  98         { }             /* Terminating entry */
  99 };
 100
 101 #undef UNUSUAL_DEV
 102
 103
 104 struct jumpshot_info {
 105    unsigned long   sectors;     /* total sector count */
 106    unsigned long   ssize;       /* sector size in bytes */
 107
 108    /* the following aren't used yet */
 109    unsigned char   sense_key;
 110    unsigned long   sense_asc;   /* additional sense code */
 111    unsigned long   sense_ascq;  /* additional sense code qualifier */
 112 };
 113
 114 static inline int jumpshot_bulk_read(struct us_data *us,
 115                                      unsigned char *data,
 116                                      unsigned int len)
 117 {
 118         if (len == 0)
 119                 return USB_STOR_XFER_GOOD;
 120
 121         US_DEBUGP("jumpshot_bulk_read:  len = %d\n", len);
 122         return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
 123                         data, len, NULL);
 124 }
 125
 126
 127 static inline int jumpshot_bulk_write(struct us_data *us,
 128                                       unsigned char *data,
 129                                       unsigned int len)
 130 {
 131         if (len == 0)
 132                 return USB_STOR_XFER_GOOD;
 133
 134         US_DEBUGP("jumpshot_bulk_write:  len = %d\n", len);
 135         return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 136                         data, len, NULL);
 137 }
 138
 139
 140 static int jumpshot_get_status(struct us_data  *us)
 141 {
 142         int rc;
 143
 144         if (!us)
 145                 return USB_STOR_TRANSPORT_ERROR;
 146
 147         // send the setup
 148         rc = usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe,
 149                                    0, 0xA0, 0, 7, us->iobuf, 1);
 150
 151         if (rc != USB_STOR_XFER_GOOD)
 152                 return USB_STOR_TRANSPORT_ERROR;
 153
 154         if (us->iobuf[0] != 0x50) {
 155                 US_DEBUGP("jumpshot_get_status:  0x%2x\n",
 156                           us->iobuf[0]);
 157                 return USB_STOR_TRANSPORT_ERROR;
 158         }
 159
 160         return USB_STOR_TRANSPORT_GOOD;
 161 }
 162
 163 static int jumpshot_read_data(struct us_data *us,
 164                               struct jumpshot_info *info,
 165                               u32 sector,
 166                               u32 sectors)
 167 {
 168         unsigned char *command = us->iobuf;
 169         unsigned char *buffer;
 170         unsigned char  thistime;
 171         unsigned int totallen, alloclen;
 172         int len, result;
 173         unsigned int sg_offset = 0;
 174         struct scatterlist *sg = NULL;
 175
 176         // we're working in LBA mode.  according to the ATA spec,
 177         // we can support up to 28-bit addressing.  I don't know if Jumpshot
 178         // supports beyond 24-bit addressing.  It's kind of hard to test
 179         // since it requires > 8GB CF card.
 180
 181         if (sector > 0x0FFFFFFF)
 182                 return USB_STOR_TRANSPORT_ERROR;
 183
 184         totallen = sectors * info->ssize;
 185
 186         // Since we don't read more than 64 KB at a time, we have to create
 187         // a bounce buffer and move the data a piece at a time between the
 188         // bounce buffer and the actual transfer buffer.
 189
 190         alloclen = min(totallen, 65536u);
 191         buffer = kmalloc(alloclen, GFP_NOIO);
 192         if (buffer == NULL)
 193                 return USB_STOR_TRANSPORT_ERROR;
 194
 195         do {
 196                 // loop, never allocate or transfer more than 64k at once
 197                 // (min(128k, 255*info->ssize) is the real limit)
 198                 len = min(totallen, alloclen);
 199                 thistime = (len / info->ssize) & 0xff;
 200
 201                 command[0] = 0;
 202                 command[1] = thistime;
 203                 command[2] = sector & 0xFF;
 204                 command[3] = (sector >>  8) & 0xFF;
 205                 command[4] = (sector >> 16) & 0xFF;
 206
 207                 command[5] = 0xE0 | ((sector >> 24) & 0x0F);
 208                 command[6] = 0x20;
 209
 210                 // send the setup + command
 211                 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 212                                                0, 0x20, 0, 1, command, 7);
 213                 if (result != USB_STOR_XFER_GOOD)
 214                         goto leave;
 215
 216                 // read the result
 217                 result = jumpshot_bulk_read(us, buffer, len);
 218                 if (result != USB_STOR_XFER_GOOD)
 219                         goto leave;
 220
 221                 US_DEBUGP("jumpshot_read_data:  %d bytes\n", len);
 222
 223                 // Store the data in the transfer buffer
 224                 usb_stor_access_xfer_buf(buffer, len, us->srb,
 225                                  &sg, &sg_offset, TO_XFER_BUF);
 226
 227                 sector += thistime;
 228                 totallen -= len;
 229         } while (totallen > 0);
 230
 231         kfree(buffer);
 232         return USB_STOR_TRANSPORT_GOOD;
 233
 234  leave:
 235         kfree(buffer);
 236         return USB_STOR_TRANSPORT_ERROR;
 237 }
 238
 239
 240 static int jumpshot_write_data(struct us_data *us,
 241                                struct jumpshot_info *info,
 242                                u32 sector,
 243                                u32 sectors)
 244 {
 245         unsigned char *command = us->iobuf;
 246         unsigned char *buffer;
 247         unsigned char  thistime;
 248         unsigned int totallen, alloclen;
 249         int len, result, waitcount;
 250         unsigned int sg_offset = 0;
 251         struct scatterlist *sg = NULL;
 252
 253         // we're working in LBA mode.  according to the ATA spec,
 254         // we can support up to 28-bit addressing.  I don't know if Jumpshot
 255         // supports beyond 24-bit addressing.  It's kind of hard to test
 256         // since it requires > 8GB CF card.
 257         //
 258         if (sector > 0x0FFFFFFF)
 259                 return USB_STOR_TRANSPORT_ERROR;
 260
 261         totallen = sectors * info->ssize;
 262
 263         // Since we don't write more than 64 KB at a time, we have to create
 264         // a bounce buffer and move the data a piece at a time between the
 265         // bounce buffer and the actual transfer buffer.
 266
 267         alloclen = min(totallen, 65536u);
 268         buffer = kmalloc(alloclen, GFP_NOIO);
 269         if (buffer == NULL)
 270                 return USB_STOR_TRANSPORT_ERROR;
 271
 272         do {
 273                 // loop, never allocate or transfer more than 64k at once
 274                 // (min(128k, 255*info->ssize) is the real limit)
 275
 276                 len = min(totallen, alloclen);
 277                 thistime = (len / info->ssize) & 0xff;
 278
 279                 // Get the data from the transfer buffer
 280                 usb_stor_access_xfer_buf(buffer, len, us->srb,
 281                                 &sg, &sg_offset, FROM_XFER_BUF);
 282
 283                 command[0] = 0;
 284                 command[1] = thistime;
 285                 command[2] = sector & 0xFF;
 286                 command[3] = (sector >>  8) & 0xFF;
 287                 command[4] = (sector >> 16) & 0xFF;
 288
 289                 command[5] = 0xE0 | ((sector >> 24) & 0x0F);
 290                 command[6] = 0x30;
 291
 292                 // send the setup + command
 293                 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 294                         0, 0x20, 0, 1, command, 7);
 295                 if (result != USB_STOR_XFER_GOOD)
 296                         goto leave;
 297
 298                 // send the data
 299                 result = jumpshot_bulk_write(us, buffer, len);
 300                 if (result != USB_STOR_XFER_GOOD)
 301                         goto leave;
 302
 303                 // read the result.  apparently the bulk write can complete
 304                 // before the jumpshot drive is finished writing.  so we loop
 305                 // here until we get a good return code
 306                 waitcount = 0;
 307                 do {
 308                         result = jumpshot_get_status(us);
 309                         if (result != USB_STOR_TRANSPORT_GOOD) {
 310                                 // I have not experimented to find the smallest value.
 311                                 //
 312                                 msleep(50);
 313                         }
 314                 } while ((result != USB_STOR_TRANSPORT_GOOD) && (waitcount < 10));
 315
 316                 if (result != USB_STOR_TRANSPORT_GOOD)
 317                         US_DEBUGP("jumpshot_write_data:  Gah!  Waitcount = 10.  Bad write!?\n");
 318
 319                 sector += thistime;
 320                 totallen -= len;
 321         } while (totallen > 0);
 322
 323         kfree(buffer);
 324         return result;
 325
 326  leave:
 327         kfree(buffer);
 328         return USB_STOR_TRANSPORT_ERROR;
 329 }
 330
 331 static int jumpshot_id_device(struct us_data *us,
 332                               struct jumpshot_info *info)
 333 {
 334         unsigned char *command = us->iobuf;
 335         unsigned char *reply;
 336         int      rc;
 337
 338         if (!info)
 339                 return USB_STOR_TRANSPORT_ERROR;
 340
 341         command[0] = 0xE0;
 342         command[1] = 0xEC;
 343         reply = kmalloc(512, GFP_NOIO);
 344         if (!reply)
 345                 return USB_STOR_TRANSPORT_ERROR;
 346
 347         // send the setup
 348         rc = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 349                                    0, 0x20, 0, 6, command, 2);
 350
 351         if (rc != USB_STOR_XFER_GOOD) {
 352                 US_DEBUGP("jumpshot_id_device:  Gah! "
 353                           "send_control for read_capacity failed\n");
 354                 rc = USB_STOR_TRANSPORT_ERROR;
 355                 goto leave;
 356         }
 357
 358         // read the reply
 359         rc = jumpshot_bulk_read(us, reply, 512);
 360         if (rc != USB_STOR_XFER_GOOD) {
 361                 rc = USB_STOR_TRANSPORT_ERROR;
 362                 goto leave;
 363         }
 364
 365         info->sectors = ((u32)(reply[117]) << 24) |
 366                         ((u32)(reply[116]) << 16) |
 367                         ((u32)(reply[115]) <<  8) |
 368                         ((u32)(reply[114])      );
 369
 370         rc = USB_STOR_TRANSPORT_GOOD;
 371
 372  leave:
 373         kfree(reply);
 374         return rc;
 375 }
 376
 377 static int jumpshot_handle_mode_sense(struct us_data *us,
 378                                       struct scsi_cmnd * srb,
 379                                       int sense_6)
 380 {
 381         static unsigned char rw_err_page[12] = {
 382                 0x1, 0xA, 0x21, 1, 0, 0, 0, 0, 1, 0, 0, 0
 383         };
 384         static unsigned char cache_page[12] = {
 385                 0x8, 0xA, 0x1, 0, 0, 0, 0, 0, 0, 0, 0, 0
 386         };
 387         static unsigned char rbac_page[12] = {
 388                 0x1B, 0xA, 0, 0x81, 0, 0, 0, 0, 0, 0, 0, 0
 389         };
 390         static unsigned char timer_page[8] = {
 391                 0x1C, 0x6, 0, 0, 0, 0
 392         };
 393         unsigned char pc, page_code;
 394         unsigned int i = 0;
 395         struct jumpshot_info *info = (struct jumpshot_info *) (us->extra);
 396         unsigned char *ptr = us->iobuf;
 397
 398         pc = srb->cmnd[2] >> 6;
 399         page_code = srb->cmnd[2] & 0x3F;
 400
 401         switch (pc) {
 402            case 0x0:
 403                 US_DEBUGP("jumpshot_handle_mode_sense:  Current values\n");
 404                 break;
 405            case 0x1:
 406                 US_DEBUGP("jumpshot_handle_mode_sense:  Changeable values\n");
 407                 break;
 408            case 0x2:
 409                 US_DEBUGP("jumpshot_handle_mode_sense:  Default values\n");
 410                 break;
 411            case 0x3:
 412                 US_DEBUGP("jumpshot_handle_mode_sense:  Saves values\n");
 413                 break;
 414         }
 415
 416         memset(ptr, 0, 8);
 417         if (sense_6) {
 418                 ptr[2] = 0x00;          // WP enable: 0x80
 419                 i = 4;
 420         } else {
 421                 ptr[3] = 0x00;          // WP enable: 0x80
 422                 i = 8;
 423         }
 424
 425         switch (page_code) {
 426            case 0x0:
 427                 // vendor-specific mode
 428                 info->sense_key = 0x05;
 429                 info->sense_asc = 0x24;
 430                 info->sense_ascq = 0x00;
 431                 return USB_STOR_TRANSPORT_FAILED;
 432
 433            case 0x1:
 434                 memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
 435                 i += sizeof(rw_err_page);
 436                 break;
 437
 438            case 0x8:
 439                 memcpy(ptr + i, cache_page, sizeof(cache_page));
 440                 i += sizeof(cache_page);
 441                 break;
 442
 443            case 0x1B:
 444                 memcpy(ptr + i, rbac_page, sizeof(rbac_page));
 445                 i += sizeof(rbac_page);
 446                 break;
 447
 448            case 0x1C:
 449                 memcpy(ptr + i, timer_page, sizeof(timer_page));
 450                 i += sizeof(timer_page);
 451                 break;
 452
 453            case 0x3F:
 454                 memcpy(ptr + i, timer_page, sizeof(timer_page));
 455                 i += sizeof(timer_page);
 456                 memcpy(ptr + i, rbac_page, sizeof(rbac_page));
 457                 i += sizeof(rbac_page);
 458                 memcpy(ptr + i, cache_page, sizeof(cache_page));
 459                 i += sizeof(cache_page);
 460                 memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
 461                 i += sizeof(rw_err_page);
 462                 break;
 463         }
 464
 465         if (sense_6)
 466                 ptr[0] = i - 1;
 467         else
 468                 ((__be16 *) ptr)[0] = cpu_to_be16(i - 2);
 469         usb_stor_set_xfer_buf(ptr, i, srb);
 470
 471         return USB_STOR_TRANSPORT_GOOD;
 472 }
 473
 474
 475 static void jumpshot_info_destructor(void *extra)
 476 {
 477         // this routine is a placeholder...
 478         // currently, we don't allocate any extra blocks so we're okay
 479 }
 480
 481
 482
 483 // Transport for the Lexar 'Jumpshot'
 484 //
 485 static int jumpshot_transport(struct scsi_cmnd *srb, struct us_data *us)
 486 {
 487         struct jumpshot_info *info;
 488         int rc;
 489         unsigned long block, blocks;
 490         unsigned char *ptr = us->iobuf;
 491         static unsigned char inquiry_response[8] = {
 492                 0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
 493         };
 494
 495         if (!us->extra) {
 496                 us->extra = kzalloc(sizeof(struct jumpshot_info), GFP_NOIO);
 497                 if (!us->extra) {
 498                         US_DEBUGP("jumpshot_transport:  Gah! Can't allocate storage for jumpshot info struct!\n");
 499                         return USB_STOR_TRANSPORT_ERROR;
 500                 }
 501                 us->extra_destructor = jumpshot_info_destructor;
 502         }
 503
 504         info = (struct jumpshot_info *) (us->extra);
 505
 506         if (srb->cmnd[0] == INQUIRY) {
 507                 US_DEBUGP("jumpshot_transport:  INQUIRY.  Returning bogus response.\n");
 508                 memcpy(ptr, inquiry_response, sizeof(inquiry_response));
 509                 fill_inquiry_response(us, ptr, 36);
 510                 return USB_STOR_TRANSPORT_GOOD;
 511         }
 512
 513         if (srb->cmnd[0] == READ_CAPACITY) {
 514                 info->ssize = 0x200;  // hard coded 512 byte sectors as per ATA spec
 515
 516                 rc = jumpshot_get_status(us);
 517                 if (rc != USB_STOR_TRANSPORT_GOOD)
 518                         return rc;
 519
 520                 rc = jumpshot_id_device(us, info);
 521                 if (rc != USB_STOR_TRANSPORT_GOOD)
 522                         return rc;
 523
 524                 US_DEBUGP("jumpshot_transport:  READ_CAPACITY:  %ld sectors, %ld bytes per sector\n",
 525                           info->sectors, info->ssize);
 526
 527                 // build the reply
 528                 //
 529                 ((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
 530                 ((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
 531                 usb_stor_set_xfer_buf(ptr, 8, srb);
 532
 533                 return USB_STOR_TRANSPORT_GOOD;
 534         }
 535
 536         if (srb->cmnd[0] == MODE_SELECT_10) {
 537                 US_DEBUGP("jumpshot_transport:  Gah! MODE_SELECT_10.\n");
 538                 return USB_STOR_TRANSPORT_ERROR;
 539         }
 540
 541         if (srb->cmnd[0] == READ_10) {
 542                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 543                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 544
 545                 blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));
 546
 547                 US_DEBUGP("jumpshot_transport:  READ_10: read block 0x%04lx  count %ld\n", block, blocks);
 548                 return jumpshot_read_data(us, info, block, blocks);
 549         }
 550
 551         if (srb->cmnd[0] == READ_12) {
 552                 // I don't think we'll ever see a READ_12 but support it anyway...
 553                 //
 554                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 555                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 556
 557                 blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
 558                          ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));
 559
 560                 US_DEBUGP("jumpshot_transport:  READ_12: read block 0x%04lx  count %ld\n", block, blocks);
 561                 return jumpshot_read_data(us, info, block, blocks);
 562         }
 563
 564         if (srb->cmnd[0] == WRITE_10) {
 565                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 566                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 567
 568                 blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));
 569
 570                 US_DEBUGP("jumpshot_transport:  WRITE_10: write block 0x%04lx  count %ld\n", block, blocks);
 571                 return jumpshot_write_data(us, info, block, blocks);
 572         }
 573
 574         if (srb->cmnd[0] == WRITE_12) {
 575                 // I don't think we'll ever see a WRITE_12 but support it anyway...
 576                 //
 577                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
 578                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
 579
 580                 blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
 581                          ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));
 582
 583                 US_DEBUGP("jumpshot_transport:  WRITE_12: write block 0x%04lx  count %ld\n", block, blocks);
 584                 return jumpshot_write_data(us, info, block, blocks);
 585         }
 586
 587
 588         if (srb->cmnd[0] == TEST_UNIT_READY) {
 589                 US_DEBUGP("jumpshot_transport:  TEST_UNIT_READY.\n");
 590                 return jumpshot_get_status(us);
 591         }
 592
 593         if (srb->cmnd[0] == REQUEST_SENSE) {
 594                 US_DEBUGP("jumpshot_transport:  REQUEST_SENSE.\n");
 595
 596                 memset(ptr, 0, 18);
 597                 ptr[0] = 0xF0;
 598                 ptr[2] = info->sense_key;
 599                 ptr[7] = 11;
 600                 ptr[12] = info->sense_asc;
 601                 ptr[13] = info->sense_ascq;
 602                 usb_stor_set_xfer_buf(ptr, 18, srb);
 603
 604                 return USB_STOR_TRANSPORT_GOOD;
 605         }
 606
 607         if (srb->cmnd[0] == MODE_SENSE) {
 608                 US_DEBUGP("jumpshot_transport:  MODE_SENSE_6 detected\n");
 609                 return jumpshot_handle_mode_sense(us, srb, 1);
 610         }
 611
 612         if (srb->cmnd[0] == MODE_SENSE_10) {
 613                 US_DEBUGP("jumpshot_transport:  MODE_SENSE_10 detected\n");
 614                 return jumpshot_handle_mode_sense(us, srb, 0);
 615         }
 616
 617         if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
 618                 // sure.  whatever.  not like we can stop the user from popping
 619                 // the media out of the device (no locking doors, etc)
 620                 //
 621                 return USB_STOR_TRANSPORT_GOOD;
 622         }
 623
 624         if (srb->cmnd[0] == START_STOP) {
 625                 /* this is used by sd.c'check_scsidisk_media_change to detect
 626                    media change */
 627                 US_DEBUGP("jumpshot_transport:  START_STOP.\n");
 628                 /* the first jumpshot_id_device after a media change returns
 629                    an error (determined experimentally) */
 630                 rc = jumpshot_id_device(us, info);
 631                 if (rc == USB_STOR_TRANSPORT_GOOD) {
 632                         info->sense_key = NO_SENSE;
 633                         srb->result = SUCCESS;
 634                 } else {
 635                         info->sense_key = UNIT_ATTENTION;
 636                         srb->result = SAM_STAT_CHECK_CONDITION;
 637                 }
 638                 return rc;
 639         }
 640
 641         US_DEBUGP("jumpshot_transport:  Gah! Unknown command: %d (0x%x)\n",
 642                   srb->cmnd[0], srb->cmnd[0]);
 643         info->sense_key = 0x05;
 644         info->sense_asc = 0x20;
 645         info->sense_ascq = 0x00;
 646         return USB_STOR_TRANSPORT_FAILED;
 647 }
 648
 649 static int jumpshot_probe(struct usb_interface *intf,
 650                          const struct usb_device_id *id)
 651 {
 652         struct us_data *us;
 653         int result;
 654
 655         result = usb_stor_probe1(&us, intf, id,
 656                         (id - jumpshot_usb_ids) + jumpshot_unusual_dev_list);
 657         if (result)
 658                 return result;
 659
 660         us->transport_name  = "Lexar Jumpshot Control/Bulk";
 661         us->transport = jumpshot_transport;
 662         us->transport_reset = usb_stor_Bulk_reset;
 663         us->max_lun = 1;
 664
 665         result = usb_stor_probe2(us);
 666         return result;
 667 }
 668
 669 static struct usb_driver jumpshot_driver = {
 670         .name =         "ums-jumpshot",
 671         .probe =        jumpshot_probe,
 672         .disconnect =   usb_stor_disconnect,
 673         .suspend =      usb_stor_suspend,
 674         .resume =       usb_stor_resume,
 675         .reset_resume = usb_stor_reset_resume,
 676         .pre_reset =    usb_stor_pre_reset,
 677         .post_reset =   usb_stor_post_reset,
 678         .id_table =     jumpshot_usb_ids,
 679         .soft_unbind =  1,
 680 };
 681
 682 static int __init jumpshot_init(void)
 683 {
 684         return usb_register(&jumpshot_driver);
 685 }
 686
 687 static void __exit jumpshot_exit(void)
 688 {
 689         usb_deregister(&jumpshot_driver);
 690 }
 691
 692 module_init(jumpshot_init);
 693 module_exit(jumpshot_exit);