drivers/scsi/sr.c

   1 /*
   2  *  sr.c Copyright (C) 1992 David Giller
   3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4  *
   5  *  adapted from:
   6  *      sd.c Copyright (C) 1992 Drew Eckhardt
   7  *      Linux scsi disk driver by
   8  *              Drew Eckhardt <drew@colorado.edu>
   9  *
  10  *      Modified by Eric Youngdale ericy@andante.org to
  11  *      add scatter-gather, multiple outstanding request, and other
  12  *      enhancements.
  13  *
  14  *          Modified by Eric Youngdale eric@andante.org to support loadable
  15  *          low-level scsi drivers.
  16  *
  17  *       Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
  18  *       provide auto-eject.
  19  *
  20  *          Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
  21  *          generic cdrom interface
  22  *
  23  *       Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
  24  *       interface, capabilities probe additions, ioctl cleanups, etc.
  25  *
  26  *       Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
  27  *
  28  *       Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
  29  *       transparently and loose the GHOST hack
  30  *
  31  *       Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  32  *       check resource allocation in sr_init and some cleanups
  33  *
  34  */
  35
  36 #include <linux/module.h>
  37
  38 #include <linux/fs.h>
  39 #include <linux/kernel.h>
  40 #include <linux/sched.h>
  41 #include <linux/mm.h>
  42 #include <linux/string.h>
  43 #include <linux/errno.h>
  44 #include <linux/cdrom.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/init.h>
  47 #include <asm/system.h>
  48 #include <asm/io.h>
  49 #include <asm/uaccess.h>
  50
  51 #define MAJOR_NR SCSI_CDROM_MAJOR
  52 #include <linux/blk.h>
  53 #include "scsi.h"
  54 #include "hosts.h"
  55 #include "sr.h"
  56 #include <scsi/scsi_ioctl.h>    /* For the door lock/unlock commands */
  57 #include "constants.h"
  58
  59 MODULE_PARM(xa_test, "i");      /* see sr_ioctl.c */
  60
  61 #define MAX_RETRIES     3
  62 #define SR_TIMEOUT      (30 * HZ)
  63
  64 static int sr_init(void);
  65 static void sr_finish(void);
  66 static int sr_attach(Scsi_Device *);
  67 static int sr_detect(Scsi_Device *);
  68 static void sr_detach(Scsi_Device *);
  69
  70 static int sr_init_command(Scsi_Cmnd *);
  71
  72 static struct Scsi_Device_Template sr_template =
  73 {
  74         name:"cdrom",
  75         tag:"sr",
  76         scsi_type:TYPE_ROM,
  77         major:SCSI_CDROM_MAJOR,
  78         blk:1,
  79         detect:sr_detect,
  80         init:sr_init,
  81         finish:sr_finish,
  82         attach:sr_attach,
  83         detach:sr_detach,
  84         init_command:sr_init_command
  85 };
  86
  87 Scsi_CD *scsi_CDs;
  88 static int *sr_sizes;
  89
  90 static int *sr_blocksizes;
  91 static int *sr_hardsizes;
  92
  93 static int sr_open(struct cdrom_device_info *, int);
  94 void get_sectorsize(int);
  95 void get_capabilities(int);
  96
  97 static int sr_media_change(struct cdrom_device_info *, int);
  98 static int sr_packet(struct cdrom_device_info *, struct cdrom_generic_command *);
  99
 100 static void sr_release(struct cdrom_device_info *cdi)
 101 {
 102         if (scsi_CDs[MINOR(cdi->dev)].device->sector_size > 2048)
 103                 sr_set_blocklength(MINOR(cdi->dev), 2048);
 104         scsi_CDs[MINOR(cdi->dev)].device->access_count--;
 105         if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module)
 106                 __MOD_DEC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module);
 107         if (sr_template.module)
 108                 __MOD_DEC_USE_COUNT(sr_template.module);
 109 }
 110
 111 static struct cdrom_device_ops sr_dops =
 112 {
 113         open:                   sr_open,
 114         release:                sr_release,
 115         drive_status:           sr_drive_status,
 116         media_changed:          sr_media_change,
 117         tray_move:              sr_tray_move,
 118         lock_door:              sr_lock_door,
 119         select_speed:           sr_select_speed,
 120         get_last_session:       sr_get_last_session,
 121         get_mcn:                sr_get_mcn,
 122         reset:                  sr_reset,
 123         audio_ioctl:            sr_audio_ioctl,
 124         dev_ioctl:              sr_dev_ioctl,
 125         capability:             CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
 126                                 CDC_SELECT_SPEED | CDC_SELECT_DISC |
 127                                 CDC_MULTI_SESSION | CDC_MCN |
 128                                 CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO |
 129                                 CDC_RESET | CDC_IOCTLS | CDC_DRIVE_STATUS |
 130                                 CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
 131                                 CDC_DVD_RAM | CDC_GENERIC_PACKET,
 132         generic_packet:         sr_packet,
 133 };
 134
 135 /*
 136  * This function checks to see if the media has been changed in the
 137  * CDROM drive.  It is possible that we have already sensed a change,
 138  * or the drive may have sensed one and not yet reported it.  We must
 139  * be ready for either case. This function always reports the current
 140  * value of the changed bit.  If flag is 0, then the changed bit is reset.
 141  * This function could be done as an ioctl, but we would need to have
 142  * an inode for that to work, and we do not always have one.
 143  */
 144
 145 int sr_media_change(struct cdrom_device_info *cdi, int slot)
 146 {
 147         int retval;
 148
 149         if (CDSL_CURRENT != slot) {
 150                 /* no changer support */
 151                 return -EINVAL;
 152         }
 153         retval = scsi_ioctl(scsi_CDs[MINOR(cdi->dev)].device,
 154                             SCSI_IOCTL_TEST_UNIT_READY, 0);
 155
 156         if (retval) {
 157                 /* Unable to test, unit probably not ready.  This usually
 158                  * means there is no disc in the drive.  Mark as changed,
 159                  * and we will figure it out later once the drive is
 160                  * available again.  */
 161
 162                 scsi_CDs[MINOR(cdi->dev)].device->changed = 1;
 163                 return 1;       /* This will force a flush, if called from
 164                                  * check_disk_change */
 165         };
 166
 167         retval = scsi_CDs[MINOR(cdi->dev)].device->changed;
 168         scsi_CDs[MINOR(cdi->dev)].device->changed = 0;
 169         /* If the disk changed, the capacity will now be different,
 170          * so we force a re-read of this information */
 171         if (retval) {
 172                 /* check multisession offset etc */
 173                 sr_cd_check(cdi);
 174
 175                 /*
 176                  * If the disk changed, the capacity will now be different,
 177                  * so we force a re-read of this information
 178                  * Force 2048 for the sector size so that filesystems won't
 179                  * be trying to use something that is too small if the disc
 180                  * has changed.
 181                  */
 182                 scsi_CDs[MINOR(cdi->dev)].needs_sector_size = 1;
 183
 184                 scsi_CDs[MINOR(cdi->dev)].device->sector_size = 2048;
 185         }
 186         return retval;
 187 }
 188
 189 /*
 190  * rw_intr is the interrupt routine for the device driver.  It will be notified on the
 191  * end of a SCSI read / write, and will take on of several actions based on success or failure.
 192  */
 193
 194 static void rw_intr(Scsi_Cmnd * SCpnt)
 195 {
 196         int result = SCpnt->result;
 197         int this_count = SCpnt->bufflen >> 9;
 198         int good_sectors = (result == 0 ? this_count : 0);
 199         int block_sectors = 0;
 200         int device_nr = DEVICE_NR(SCpnt->request.rq_dev);
 201         long error_sector;
 202
 203 #ifdef DEBUG
 204         printk("sr.c done: %x %p\n", result, SCpnt->request.bh->b_data);
 205 #endif
 206         /*
 207            Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial success.
 208            Since this is a relatively rare error condition, no care is taken to
 209            avoid unnecessary additional work such as memcpy's that could be avoided.
 210          */
 211
 212
 213         if (driver_byte(result) != 0 &&         /* An error occurred */
 214             (SCpnt->sense_buffer[0] & 0x7f) == 0x70) {  /* Sense data is valid */
 215                 switch (SCpnt->sense_buffer[2]) {
 216                 case MEDIUM_ERROR:
 217                 case VOLUME_OVERFLOW:
 218                 case ILLEGAL_REQUEST:
 219                         if (!(SCpnt->sense_buffer[0] & 0x80))
 220                                 break;
 221                         error_sector = (SCpnt->sense_buffer[3] << 24) |
 222                         (SCpnt->sense_buffer[4] << 16) |
 223                         (SCpnt->sense_buffer[5] << 8) |
 224                         SCpnt->sense_buffer[6];
 225                         if (SCpnt->request.bh != NULL)
 226                                 block_sectors = SCpnt->request.bh->b_size >> 9;
 227                         if (block_sectors < 4)
 228                                 block_sectors = 4;
 229                         if (scsi_CDs[device_nr].device->sector_size == 2048)
 230                                 error_sector <<= 2;
 231                         error_sector &= ~(block_sectors - 1);
 232                         good_sectors = error_sector - SCpnt->request.sector;
 233                         if (good_sectors < 0 || good_sectors >= this_count)
 234                                 good_sectors = 0;
 235                         /*
 236                          * The SCSI specification allows for the value returned
 237                          * by READ CAPACITY to be up to 75 2K sectors past the
 238                          * last readable block.  Therefore, if we hit a medium
 239                          * error within the last 75 2K sectors, we decrease the
 240                          * saved size value.
 241                          */
 242                         if ((error_sector >> 1) < sr_sizes[device_nr] &&
 243                             scsi_CDs[device_nr].capacity - error_sector < 4 *75)
 244                                 sr_sizes[device_nr] = error_sector >> 1;
 245                         break;
 246
 247                 case RECOVERED_ERROR:
 248                         /*
 249                          * An error occured, but it recovered.  Inform the
 250                          * user, but make sure that it's not treated as a
 251                          * hard error.
 252                          */
 253                         print_sense("sr", SCpnt);
 254                         result = 0;
 255                         SCpnt->sense_buffer[0] = 0x0;
 256                         good_sectors = this_count;
 257                         break;
 258
 259                 default:
 260                         break;
 261                 }
 262         }
 263
 264         /*
 265          * This calls the generic completion function, now that we know
 266          * how many actual sectors finished, and how many sectors we need
 267          * to say have failed.
 268          */
 269         scsi_io_completion(SCpnt, good_sectors, block_sectors);
 270 }
 271
 272
 273 static request_queue_t *sr_find_queue(kdev_t dev)
 274 {
 275         /*
 276          * No such device
 277          */
 278         if (MINOR(dev) >= sr_template.dev_max || !scsi_CDs[MINOR(dev)].device)
 279                 return NULL;
 280
 281         return &scsi_CDs[MINOR(dev)].device->request_queue;
 282 }
 283
 284 static int sr_scatter_pad(Scsi_Cmnd *SCpnt, int s_size)
 285 {
 286         struct scatterlist *sg, *old_sg = NULL;
 287         int i, fsize, bsize, sg_ent, sg_count;
 288         char *front, *back;
 289         void **bbpnt, **old_bbpnt = NULL;
 290
 291         back = front = NULL;
 292         sg_ent = SCpnt->use_sg;
 293         bsize = 0; /* gcc... */
 294
 295         /*
 296          * need front pad
 297          */
 298         if ((fsize = SCpnt->request.sector % (s_size >> 9))) {
 299                 fsize <<= 9;
 300                 sg_ent++;
 301                 if ((front = scsi_malloc(fsize)) == NULL)
 302                         goto no_mem;
 303         }
 304         /*
 305          * need a back pad too
 306          */
 307         if ((bsize = s_size - ((SCpnt->request_bufflen + fsize) % s_size))) {
 308                 sg_ent++;
 309                 if ((back = scsi_malloc(bsize)) == NULL)
 310                         goto no_mem;
 311         }
 312
 313         /*
 314          * extend or allocate new scatter-gather table
 315          */
 316         sg_count = SCpnt->use_sg;
 317         if (sg_count) {
 318                 old_sg = (struct scatterlist *) SCpnt->request_buffer;
 319                 old_bbpnt = SCpnt->bounce_buffers;
 320         } else {
 321                 sg_count = 1;
 322                 sg_ent++;
 323         }
 324
 325         /* Get space for scatterlist and bounce buffer array. */
 326         i  = sg_ent * sizeof(struct scatterlist);
 327         i += sg_ent * sizeof(void *);
 328         i  = (i + 511) & ~511;
 329
 330         if ((sg = scsi_malloc(i)) == NULL)
 331                 goto no_mem;
 332
 333         bbpnt = (void **)
 334                 ((char *)sg + (sg_ent * sizeof(struct scatterlist)));
 335
 336         /*
 337          * no more failing memory allocs possible, we can safely assign
 338          * SCpnt values now
 339          */
 340         SCpnt->sglist_len = i;
 341         SCpnt->use_sg = sg_count;
 342         memset(sg, 0, SCpnt->sglist_len);
 343
 344         i = 0;
 345         if (fsize) {
 346                 sg[0].address = bbpnt[0] = front;
 347                 sg[0].length = fsize;
 348                 i++;
 349         }
 350         if (old_sg) {
 351                 memcpy(sg + i, old_sg, SCpnt->use_sg * sizeof(struct scatterlist));
 352                 if (old_bbpnt)
 353                         memcpy(bbpnt + i, old_bbpnt, SCpnt->use_sg * sizeof(void *));
 354                 scsi_free(old_sg, (((SCpnt->use_sg * sizeof(struct scatterlist)) +
 355                                     (SCpnt->use_sg * sizeof(void *))) + 511) & ~511);
 356         } else {
 357                 sg[i].address = SCpnt->request_buffer;
 358                 sg[i].length = SCpnt->request_bufflen;
 359         }
 360
 361         SCpnt->request_bufflen += (fsize + bsize);
 362         SCpnt->request_buffer = sg;
 363         SCpnt->bounce_buffers = bbpnt;
 364         SCpnt->use_sg += i;
 365
 366         if (bsize) {
 367                 sg[SCpnt->use_sg].address = back;
 368                 bbpnt[SCpnt->use_sg] = back;
 369                 sg[SCpnt->use_sg].length = bsize;
 370                 SCpnt->use_sg++;
 371         }
 372
 373         return 0;
 374
 375 no_mem:
 376         printk("sr: ran out of mem for scatter pad\n");
 377         if (front)
 378                 scsi_free(front, fsize);
 379         if (back)
 380                 scsi_free(back, bsize);
 381
 382         return 1;
 383 }
 384
 385
 386 static int sr_init_command(Scsi_Cmnd * SCpnt)
 387 {
 388         int dev, devm, block=0, this_count, s_size;
 389
 390         devm = MINOR(SCpnt->request.rq_dev);
 391         dev = DEVICE_NR(SCpnt->request.rq_dev);
 392
 393         SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %d, block = %d\n", devm, block));
 394
 395         if (dev >= sr_template.nr_dev ||
 396             !scsi_CDs[dev].device ||
 397             !scsi_CDs[dev].device->online) {
 398                 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", SCpnt->request.nr_sectors));
 399                 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
 400                 return 0;
 401         }
 402         if (scsi_CDs[dev].device->changed) {
 403                 /*
 404                  * quietly refuse to do anything to a changed disc until the
 405                  * changed bit has been reset
 406                  */
 407                 return 0;
 408         }
 409
 410         if ((SCpnt->request.cmd == WRITE) && !scsi_CDs[dev].device->writeable)
 411                 return 0;
 412
 413         /*
 414          * we do lazy blocksize switching (when reading XA sectors,
 415          * see CDROMREADMODE2 ioctl)
 416          */
 417         s_size = scsi_CDs[dev].device->sector_size;
 418         if (s_size > 2048) {
 419                 if (!in_interrupt())
 420                         sr_set_blocklength(DEVICE_NR(CURRENT->rq_dev), 2048);
 421                 else
 422                         printk("sr: can't switch blocksize: in interrupt\n");
 423         }
 424
 425         if (s_size != 512 && s_size != 1024 && s_size != 2048) {
 426                 printk("sr: bad sector size %d\n", s_size);
 427                 return 0;
 428         }
 429
 430         block = SCpnt->request.sector / (s_size >> 9);
 431
 432         /*
 433          * request doesn't start on hw block boundary, add scatter pads
 434          */
 435         if ((SCpnt->request.sector % (s_size >> 9)) || (SCpnt->request_bufflen % s_size))
 436                 if (sr_scatter_pad(SCpnt, s_size))
 437                         return 0;
 438
 439         this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9);
 440
 441         switch (SCpnt->request.cmd) {
 442         case WRITE:
 443                 SCpnt->cmnd[0] = WRITE_10;
 444                 SCpnt->sc_data_direction = SCSI_DATA_WRITE;
 445                 break;
 446         case READ:
 447                 SCpnt->cmnd[0] = READ_10;
 448                 SCpnt->sc_data_direction = SCSI_DATA_READ;
 449                 break;
 450         default:
 451                 printk("Unknown sr command %d\n", SCpnt->request.cmd);
 452                 return 0;
 453         }
 454
 455         SCSI_LOG_HLQUEUE(2, printk("sr%d : %s %d/%ld 512 byte blocks.\n",
 456                                    devm,
 457                    (SCpnt->request.cmd == WRITE) ? "writing" : "reading",
 458                                  this_count, SCpnt->request.nr_sectors));
 459
 460         SCpnt->cmnd[1] = (SCpnt->device->scsi_level <= SCSI_2) ?
 461                          ((SCpnt->lun << 5) & 0xe0) : 0;
 462
 463         if (this_count > 0xffff)
 464                 this_count = 0xffff;
 465
 466         SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
 467         SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
 468         SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
 469         SCpnt->cmnd[5] = (unsigned char) block & 0xff;
 470         SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
 471         SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
 472         SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
 473
 474         /*
 475          * We shouldn't disconnect in the middle of a sector, so with a dumb
 476          * host adapter, it's safe to assume that we can at least transfer
 477          * this many bytes between each connect / disconnect.
 478          */
 479         SCpnt->transfersize = scsi_CDs[dev].device->sector_size;
 480         SCpnt->underflow = this_count << 9;
 481
 482         SCpnt->allowed = MAX_RETRIES;
 483         SCpnt->timeout_per_command = SR_TIMEOUT;
 484
 485         /*
 486          * This is the completion routine we use.  This is matched in terms
 487          * of capability to this function.
 488          */
 489         SCpnt->done = rw_intr;
 490
 491         {
 492                 struct scatterlist *sg = SCpnt->request_buffer;
 493                 int i, size = 0;
 494                 for (i = 0; i < SCpnt->use_sg; i++)
 495                         size += sg[i].length;
 496
 497                 if (size != SCpnt->request_bufflen && SCpnt->use_sg) {
 498                         printk("sr: mismatch count %d, bytes %d\n", size, SCpnt->request_bufflen);
 499                         SCpnt->request_bufflen = size;
 500                 }
 501         }
 502
 503         /*
 504          * This indicates that the command is ready from our end to be
 505          * queued.
 506          */
 507         return 1;
 508 }
 509
 510 struct block_device_operations sr_bdops =
 511 {
 512         owner:                  THIS_MODULE,
 513         open:                   cdrom_open,
 514         release:                cdrom_release,
 515         ioctl:                  cdrom_ioctl,
 516         check_media_change:     cdrom_media_changed,
 517 };
 518
 519 static int sr_open(struct cdrom_device_info *cdi, int purpose)
 520 {
 521         check_disk_change(cdi->dev);
 522
 523         if (MINOR(cdi->dev) >= sr_template.dev_max
 524             || !scsi_CDs[MINOR(cdi->dev)].device) {
 525                 return -ENXIO;  /* No such device */
 526         }
 527         /*
 528          * If the device is in error recovery, wait until it is done.
 529          * If the device is offline, then disallow any access to it.
 530          */
 531         if (!scsi_block_when_processing_errors(scsi_CDs[MINOR(cdi->dev)].device)) {
 532                 return -ENXIO;
 533         }
 534         scsi_CDs[MINOR(cdi->dev)].device->access_count++;
 535         if (scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module)
 536                 __MOD_INC_USE_COUNT(scsi_CDs[MINOR(cdi->dev)].device->host->hostt->module);
 537         if (sr_template.module)
 538                 __MOD_INC_USE_COUNT(sr_template.module);
 539
 540         /* If this device did not have media in the drive at boot time, then
 541          * we would have been unable to get the sector size.  Check to see if
 542          * this is the case, and try again.
 543          */
 544
 545         if (scsi_CDs[MINOR(cdi->dev)].needs_sector_size)
 546                 get_sectorsize(MINOR(cdi->dev));
 547
 548         return 0;
 549 }
 550
 551 static int sr_detect(Scsi_Device * SDp)
 552 {
 553
 554         if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM)
 555                 return 0;
 556         sr_template.dev_noticed++;
 557         return 1;
 558 }
 559
 560 static int sr_attach(Scsi_Device * SDp)
 561 {
 562         Scsi_CD *cpnt;
 563         int i;
 564
 565         if (SDp->type != TYPE_ROM && SDp->type != TYPE_WORM)
 566                 return 1;
 567
 568         if (sr_template.nr_dev >= sr_template.dev_max) {
 569                 SDp->attached--;
 570                 return 1;
 571         }
 572         for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
 573                 if (!cpnt->device)
 574                         break;
 575
 576         if (i >= sr_template.dev_max)
 577                 panic("scsi_devices corrupt (sr)");
 578
 579
 580         scsi_CDs[i].device = SDp;
 581
 582         sr_template.nr_dev++;
 583         if (sr_template.nr_dev > sr_template.dev_max)
 584                 panic("scsi_devices corrupt (sr)");
 585
 586         printk("Attached scsi CD-ROM sr%d at scsi%d, channel %d, id %d, lun %d\n",
 587                i, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
 588         return 0;
 589 }
 590
 591
 592 void get_sectorsize(int i)
 593 {
 594         unsigned char cmd[10];
 595         unsigned char *buffer;
 596         int the_result, retries;
 597         int sector_size;
 598         Scsi_Request *SRpnt;
 599
 600         buffer = (unsigned char *) scsi_malloc(512);
 601         SRpnt = scsi_allocate_request(scsi_CDs[i].device);
 602
 603         if(buffer == NULL || SRpnt == NULL)
 604         {
 605                 scsi_CDs[i].capacity = 0x1fffff;
 606                 sector_size = 2048;     /* A guess, just in case */
 607                 scsi_CDs[i].needs_sector_size = 1;
 608                 if(buffer)
 609                         scsi_free(buffer, 512);
 610                 if(SRpnt)
 611                         scsi_release_request(SRpnt);
 612                 return;
 613         }
 614
 615         retries = 3;
 616         do {
 617                 cmd[0] = READ_CAPACITY;
 618                 cmd[1] = (scsi_CDs[i].device->scsi_level <= SCSI_2) ?
 619                          ((scsi_CDs[i].device->lun << 5) & 0xe0) : 0;
 620                 memset((void *) &cmd[2], 0, 8);
 621                 SRpnt->sr_request.rq_status = RQ_SCSI_BUSY;     /* Mark as really busy */
 622                 SRpnt->sr_cmd_len = 0;
 623
 624                 memset(buffer, 0, 8);
 625
 626                 /* Do the command and wait.. */
 627
 628                 SRpnt->sr_data_direction = SCSI_DATA_READ;
 629                 scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer,
 630                               8, SR_TIMEOUT, MAX_RETRIES);
 631
 632                 the_result = SRpnt->sr_result;
 633                 retries--;
 634
 635         } while (the_result && retries);
 636
 637
 638         scsi_release_request(SRpnt);
 639         SRpnt = NULL;
 640
 641         if (the_result) {
 642                 scsi_CDs[i].capacity = 0x1fffff;
 643                 sector_size = 2048;     /* A guess, just in case */
 644                 scsi_CDs[i].needs_sector_size = 1;
 645         } else {
 646 #if 0
 647                 if (cdrom_get_last_written(MKDEV(MAJOR_NR, i),
 648                                            &scsi_CDs[i].capacity))
 649 #endif
 650                         scsi_CDs[i].capacity = 1 + ((buffer[0] << 24) |
 651                                                     (buffer[1] << 16) |
 652                                                     (buffer[2] << 8) |
 653                                                     buffer[3]);
 654                 sector_size = (buffer[4] << 24) |
 655                     (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
 656                 switch (sector_size) {
 657                         /*
 658                          * HP 4020i CD-Recorder reports 2340 byte sectors
 659                          * Philips CD-Writers report 2352 byte sectors
 660                          *
 661                          * Use 2k sectors for them..
 662                          */
 663                 case 0:
 664                 case 2340:
 665                 case 2352:
 666                         sector_size = 2048;
 667                         /* fall through */
 668                 case 2048:
 669                         scsi_CDs[i].capacity *= 4;
 670                         /* fall through */
 671                 case 512:
 672                         break;
 673                 default:
 674                         printk("sr%d: unsupported sector size %d.\n",
 675                                i, sector_size);
 676                         scsi_CDs[i].capacity = 0;
 677                         scsi_CDs[i].needs_sector_size = 1;
 678                 }
 679
 680                 scsi_CDs[i].device->sector_size = sector_size;
 681
 682                 /*
 683                  * Add this so that we have the ability to correctly gauge
 684                  * what the device is capable of.
 685                  */
 686                 scsi_CDs[i].needs_sector_size = 0;
 687                 sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9);
 688         };
 689         scsi_free(buffer, 512);
 690 }
 691
 692 void get_capabilities(int i)
 693 {
 694         unsigned char cmd[6];
 695         unsigned char *buffer;
 696         int rc, n;
 697
 698         static char *loadmech[] =
 699         {
 700                 "caddy",
 701                 "tray",
 702                 "pop-up",
 703                 "",
 704                 "changer",
 705                 "cartridge changer",
 706                 "",
 707                 ""
 708         };
 709
 710         buffer = (unsigned char *) scsi_malloc(512);
 711         if (!buffer)
 712         {
 713                 printk(KERN_ERR "sr: out of memory.\n");
 714                 return;
 715         }
 716         cmd[0] = MODE_SENSE;
 717         cmd[1] = (scsi_CDs[i].device->scsi_level <= SCSI_2) ?
 718                  ((scsi_CDs[i].device->lun << 5) & 0xe0) : 0;
 719         cmd[2] = 0x2a;
 720         cmd[4] = 128;
 721         cmd[3] = cmd[5] = 0;
 722         rc = sr_do_ioctl(i, cmd, buffer, 128, 1, SCSI_DATA_READ, NULL);
 723
 724         if (rc) {
 725                 /* failed, drive doesn't have capabilities mode page */
 726                 scsi_CDs[i].cdi.speed = 1;
 727                 scsi_CDs[i].cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
 728                                          CDC_DVD | CDC_DVD_RAM |
 729                                          CDC_SELECT_DISC | CDC_SELECT_SPEED);
 730                 scsi_free(buffer, 512);
 731                 printk("sr%i: scsi-1 drive\n", i);
 732                 return;
 733         }
 734         n = buffer[3] + 4;
 735         scsi_CDs[i].cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
 736         scsi_CDs[i].readcd_known = 1;
 737         scsi_CDs[i].readcd_cdda = buffer[n + 5] & 0x01;
 738         /* print some capability bits */
 739         printk("sr%i: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", i,
 740                ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
 741                scsi_CDs[i].cdi.speed,
 742                buffer[n + 3] & 0x01 ? "writer " : "",   /* CD Writer */
 743                buffer[n + 3] & 0x20 ? "dvd-ram " : "",
 744                buffer[n + 2] & 0x02 ? "cd/rw " : "",    /* can read rewriteable */
 745                buffer[n + 4] & 0x20 ? "xa/form2 " : "",         /* can read xa/from2 */
 746                buffer[n + 5] & 0x01 ? "cdda " : "",     /* can read audio data */
 747                loadmech[buffer[n + 6] >> 5]);
 748         if ((buffer[n + 6] >> 5) == 0)
 749                 /* caddy drives can't close tray... */
 750                 scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY;
 751         if ((buffer[n + 2] & 0x8) == 0)
 752                 /* not a DVD drive */
 753                 scsi_CDs[i].cdi.mask |= CDC_DVD;
 754         if ((buffer[n + 3] & 0x20) == 0) {
 755                 /* can't write DVD-RAM media */
 756                 scsi_CDs[i].cdi.mask |= CDC_DVD_RAM;
 757         } else {
 758                 scsi_CDs[i].device->writeable = 1;
 759         }
 760         if ((buffer[n + 3] & 0x10) == 0)
 761                 /* can't write DVD-R media */
 762                 scsi_CDs[i].cdi.mask |= CDC_DVD_R;
 763         if ((buffer[n + 3] & 0x2) == 0)
 764                 /* can't write CD-RW media */
 765                 scsi_CDs[i].cdi.mask |= CDC_CD_RW;
 766         if ((buffer[n + 3] & 0x1) == 0)
 767                 /* can't write CD-R media */
 768                 scsi_CDs[i].cdi.mask |= CDC_CD_R;
 769         if ((buffer[n + 6] & 0x8) == 0)
 770                 /* can't eject */
 771                 scsi_CDs[i].cdi.mask |= CDC_OPEN_TRAY;
 772
 773         if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
 774             (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
 775                 scsi_CDs[i].cdi.capacity =
 776                     cdrom_number_of_slots(&(scsi_CDs[i].cdi));
 777         if (scsi_CDs[i].cdi.capacity <= 1)
 778                 /* not a changer */
 779                 scsi_CDs[i].cdi.mask |= CDC_SELECT_DISC;
 780         /*else    I don't think it can close its tray
 781            scsi_CDs[i].cdi.mask |= CDC_CLOSE_TRAY; */
 782
 783         scsi_free(buffer, 512);
 784 }
 785
 786 /*
 787  * sr_packet() is the entry point for the generic commands generated
 788  * by the Uniform CD-ROM layer.
 789  */
 790 static int sr_packet(struct cdrom_device_info *cdi, struct cdrom_generic_command *cgc)
 791 {
 792         Scsi_Device *device = scsi_CDs[MINOR(cdi->dev)].device;
 793
 794         /* set the LUN */
 795         if (device->scsi_level <= SCSI_2)
 796                 cgc->cmd[1] |= device->lun << 5;
 797
 798         cgc->stat = sr_do_ioctl(MINOR(cdi->dev), cgc->cmd, cgc->buffer, cgc->buflen, cgc->quiet, cgc->data_direction, cgc->sense);
 799
 800         return cgc->stat;
 801 }
 802
 803 static int sr_registered;
 804
 805 static int sr_init()
 806 {
 807         int i;
 808
 809         if (sr_template.dev_noticed == 0)
 810                 return 0;
 811
 812         if (!sr_registered) {
 813                 if (devfs_register_blkdev(MAJOR_NR, "sr", &sr_bdops)) {
 814                         printk("Unable to get major %d for SCSI-CD\n", MAJOR_NR);
 815                         sr_template.dev_noticed = 0;
 816                         return 1;
 817                 }
 818                 sr_registered++;
 819         }
 820         if (scsi_CDs)
 821                 return 0;
 822
 823         sr_template.dev_max = sr_template.dev_noticed + SR_EXTRA_DEVS;
 824         scsi_CDs = kmalloc(sr_template.dev_max * sizeof(Scsi_CD), GFP_ATOMIC);
 825         if (!scsi_CDs)
 826                 goto cleanup_devfs;
 827         memset(scsi_CDs, 0, sr_template.dev_max * sizeof(Scsi_CD));
 828
 829         sr_sizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
 830         if (!sr_sizes)
 831                 goto cleanup_cds;
 832         memset(sr_sizes, 0, sr_template.dev_max * sizeof(int));
 833
 834         sr_blocksizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
 835         if (!sr_blocksizes)
 836                 goto cleanup_sizes;
 837
 838         sr_hardsizes = kmalloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC);
 839         if (!sr_hardsizes)
 840                 goto cleanup_blocksizes;
 841         /*
 842          * These are good guesses for the time being.
 843          */
 844         for (i = 0; i < sr_template.dev_max; i++) {
 845                 sr_blocksizes[i] = 2048;
 846                 sr_hardsizes[i] = 2048;
 847         }
 848         blksize_size[MAJOR_NR] = sr_blocksizes;
 849         hardsect_size[MAJOR_NR] = sr_hardsizes;
 850         return 0;
 851 cleanup_blocksizes:
 852         kfree(sr_blocksizes);
 853 cleanup_sizes:
 854         kfree(sr_sizes);
 855 cleanup_cds:
 856         kfree(scsi_CDs);
 857         scsi_CDs = NULL;
 858 cleanup_devfs:
 859         devfs_unregister_blkdev(MAJOR_NR, "sr");
 860         sr_template.dev_noticed = 0;
 861         sr_registered--;
 862         return 1;
 863 }
 864
 865 void sr_finish()
 866 {
 867         int i;
 868         char name[6];
 869
 870         blk_dev[MAJOR_NR].queue = sr_find_queue;
 871         blk_size[MAJOR_NR] = sr_sizes;
 872
 873         for (i = 0; i < sr_template.nr_dev; ++i) {
 874                 /* If we have already seen this, then skip it.  Comes up
 875                  * with loadable modules. */
 876                 if (scsi_CDs[i].capacity)
 877                         continue;
 878                 scsi_CDs[i].capacity = 0x1fffff;
 879                 scsi_CDs[i].device->sector_size = 2048;         /* A guess, just in case */
 880                 scsi_CDs[i].needs_sector_size = 1;
 881                 scsi_CDs[i].device->changed = 1;        /* force recheck CD type */
 882 #if 0
 883                 /* seems better to leave this for later */
 884                 get_sectorsize(i);
 885                 printk("Scd sectorsize = %d bytes.\n", scsi_CDs[i].sector_size);
 886 #endif
 887                 scsi_CDs[i].use = 1;
 888
 889                 scsi_CDs[i].device->ten = 1;
 890                 scsi_CDs[i].device->remap = 1;
 891                 scsi_CDs[i].readcd_known = 0;
 892                 scsi_CDs[i].readcd_cdda = 0;
 893                 sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS - 9);
 894
 895                 scsi_CDs[i].cdi.ops = &sr_dops;
 896                 scsi_CDs[i].cdi.handle = &scsi_CDs[i];
 897                 scsi_CDs[i].cdi.dev = MKDEV(MAJOR_NR, i);
 898                 scsi_CDs[i].cdi.mask = 0;
 899                 scsi_CDs[i].cdi.capacity = 1;
 900                 /*
 901                  *      FIXME: someone needs to handle a get_capabilities
 902                  *      failure properly ??
 903                  */
 904                 get_capabilities(i);
 905                 sr_vendor_init(i);
 906
 907                 sprintf(name, "sr%d", i);
 908                 strcpy(scsi_CDs[i].cdi.name, name);
 909                 scsi_CDs[i].cdi.de =
 910                     devfs_register (scsi_CDs[i].device->de, "cd",
 911                                     DEVFS_FL_DEFAULT, MAJOR_NR, i,
 912                                     S_IFBLK | S_IRUGO | S_IWUGO,
 913                                     &sr_bdops, NULL);
 914                 register_cdrom(&scsi_CDs[i].cdi);
 915         }
 916
 917
 918         /* If our host adapter is capable of scatter-gather, then we increase
 919          * the read-ahead to 16 blocks (32 sectors).  If not, we use
 920          * a two block (4 sector) read ahead. */
 921         if (scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize)
 922                 read_ahead[MAJOR_NR] = 32;      /* 32 sector read-ahead.  Always removable. */
 923         else
 924                 read_ahead[MAJOR_NR] = 4;       /* 4 sector read-ahead */
 925
 926         return;
 927 }
 928
 929 static void sr_detach(Scsi_Device * SDp)
 930 {
 931         Scsi_CD *cpnt;
 932         int i;
 933
 934         if (scsi_CDs == NULL)
 935                 return;
 936         for (cpnt = scsi_CDs, i = 0; i < sr_template.dev_max; i++, cpnt++)
 937                 if (cpnt->device == SDp) {
 938                         /*
 939                          * Since the cdrom is read-only, no need to sync the device.
 940                          * We should be kind to our buffer cache, however.
 941                          */
 942                         invalidate_device(MKDEV(MAJOR_NR, i), 0);
 943
 944                         /*
 945                          * Reset things back to a sane state so that one can re-load a new
 946                          * driver (perhaps the same one).
 947                          */
 948                         unregister_cdrom(&(cpnt->cdi));
 949                         cpnt->device = NULL;
 950                         cpnt->capacity = 0;
 951                         SDp->attached--;
 952                         sr_template.nr_dev--;
 953                         sr_template.dev_noticed--;
 954                         sr_sizes[i] = 0;
 955                         return;
 956                 }
 957         return;
 958 }
 959
 960 static int __init init_sr(void)
 961 {
 962         sr_template.module = THIS_MODULE;
 963         return scsi_register_module(MODULE_SCSI_DEV, &sr_template);
 964 }
 965
 966 static void __exit exit_sr(void)
 967 {
 968         scsi_unregister_module(MODULE_SCSI_DEV, &sr_template);
 969         devfs_unregister_blkdev(MAJOR_NR, "sr");
 970         sr_registered--;
 971         if (scsi_CDs != NULL) {
 972                 kfree(scsi_CDs);
 973
 974                 kfree(sr_sizes);
 975                 sr_sizes = NULL;
 976
 977                 kfree(sr_blocksizes);
 978                 sr_blocksizes = NULL;
 979                 kfree(sr_hardsizes);
 980                 sr_hardsizes = NULL;
 981         }
 982         blksize_size[MAJOR_NR] = NULL;
 983         hardsect_size[MAJOR_NR] = NULL;
 984         blk_size[MAJOR_NR] = NULL;
 985         read_ahead[MAJOR_NR] = 0;
 986
 987         sr_template.dev_max = 0;
 988 }
 989
 990 module_init(init_sr);
 991 module_exit(exit_sr);
 992 MODULE_LICENSE("GPL");