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 lose 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 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/string.h> 41 #include <linux/errno.h> 42 #include <linux/cdrom.h> 43 #include <linux/interrupt.h> 44 #include <linux/init.h> 45 #include <linux/blkdev.h> 46 #include <linux/mutex.h> 47 #include <asm/uaccess.h> 48 49 #include <scsi/scsi.h> 50 #include <scsi/scsi_dbg.h> 51 #include <scsi/scsi_device.h> 52 #include <scsi/scsi_driver.h> 53 #include <scsi/scsi_cmnd.h> 54 #include <scsi/scsi_eh.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 57 58 #include "scsi_logging.h" 59 #include "sr.h" 60 61 62 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 63 MODULE_LICENSE("GPL"); 64 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 65 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 66 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 67 68 #define SR_DISKS 256 69 70 #define SR_CAPABILITIES \ 71 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 72 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 73 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 74 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 75 CDC_MRW|CDC_MRW_W|CDC_RAM) 76 77 static int sr_probe(struct device *); 78 static int sr_remove(struct device *); 79 static int sr_done(struct scsi_cmnd *); 80 81 static struct scsi_driver sr_template = { 82 .owner = THIS_MODULE, 83 .gendrv = { 84 .name = "sr", 85 .probe = sr_probe, 86 .remove = sr_remove, 87 }, 88 .done = sr_done, 89 }; 90 91 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 92 static DEFINE_SPINLOCK(sr_index_lock); 93 94 /* This semaphore is used to mediate the 0->1 reference get in the 95 * face of object destruction (i.e. we can't allow a get on an 96 * object after last put) */ 97 static DEFINE_MUTEX(sr_ref_mutex); 98 99 static int sr_open(struct cdrom_device_info *, int); 100 static void sr_release(struct cdrom_device_info *); 101 102 static void get_sectorsize(struct scsi_cd *); 103 static void get_capabilities(struct scsi_cd *); 104 105 static int sr_media_change(struct cdrom_device_info *, int); 106 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 107 108 static struct cdrom_device_ops sr_dops = { 109 .open = sr_open, 110 .release = sr_release, 111 .drive_status = sr_drive_status, 112 .media_changed = sr_media_change, 113 .tray_move = sr_tray_move, 114 .lock_door = sr_lock_door, 115 .select_speed = sr_select_speed, 116 .get_last_session = sr_get_last_session, 117 .get_mcn = sr_get_mcn, 118 .reset = sr_reset, 119 .audio_ioctl = sr_audio_ioctl, 120 .capability = SR_CAPABILITIES, 121 .generic_packet = sr_packet, 122 }; 123 124 static void sr_kref_release(struct kref *kref); 125 126 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 127 { 128 return container_of(disk->private_data, struct scsi_cd, driver); 129 } 130 131 /* 132 * The get and put routines for the struct scsi_cd. Note this entity 133 * has a scsi_device pointer and owns a reference to this. 134 */ 135 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 136 { 137 struct scsi_cd *cd = NULL; 138 139 mutex_lock(&sr_ref_mutex); 140 if (disk->private_data == NULL) 141 goto out; 142 cd = scsi_cd(disk); 143 kref_get(&cd->kref); 144 if (scsi_device_get(cd->device)) 145 goto out_put; 146 goto out; 147 148 out_put: 149 kref_put(&cd->kref, sr_kref_release); 150 cd = NULL; 151 out: 152 mutex_unlock(&sr_ref_mutex); 153 return cd; 154 } 155 156 static void scsi_cd_put(struct scsi_cd *cd) 157 { 158 struct scsi_device *sdev = cd->device; 159 160 mutex_lock(&sr_ref_mutex); 161 kref_put(&cd->kref, sr_kref_release); 162 scsi_device_put(sdev); 163 mutex_unlock(&sr_ref_mutex); 164 } 165 166 /* identical to scsi_test_unit_ready except that it doesn't 167 * eat the NOT_READY returns for removable media */ 168 int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) 169 { 170 int retries = MAX_RETRIES; 171 int the_result; 172 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; 173 174 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 175 * conditions are gone, or a timeout happens 176 */ 177 do { 178 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 179 0, sshdr, SR_TIMEOUT, 180 retries--, NULL); 181 if (scsi_sense_valid(sshdr) && 182 sshdr->sense_key == UNIT_ATTENTION) 183 sdev->changed = 1; 184 185 } while (retries > 0 && 186 (!scsi_status_is_good(the_result) || 187 (scsi_sense_valid(sshdr) && 188 sshdr->sense_key == UNIT_ATTENTION))); 189 return the_result; 190 } 191 192 /* 193 * This function checks to see if the media has been changed in the 194 * CDROM drive. It is possible that we have already sensed a change, 195 * or the drive may have sensed one and not yet reported it. We must 196 * be ready for either case. This function always reports the current 197 * value of the changed bit. If flag is 0, then the changed bit is reset. 198 * This function could be done as an ioctl, but we would need to have 199 * an inode for that to work, and we do not always have one. 200 */ 201 202 static int sr_media_change(struct cdrom_device_info *cdi, int slot) 203 { 204 struct scsi_cd *cd = cdi->handle; 205 int retval; 206 struct scsi_sense_hdr *sshdr; 207 208 if (CDSL_CURRENT != slot) { 209 /* no changer support */ 210 return -EINVAL; 211 } 212 213 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 214 retval = sr_test_unit_ready(cd->device, sshdr); 215 if (retval || (scsi_sense_valid(sshdr) && 216 /* 0x3a is medium not present */ 217 sshdr->asc == 0x3a)) { 218 /* Media not present or unable to test, unit probably not 219 * ready. This usually means there is no disc in the drive. 220 * Mark as changed, and we will figure it out later once 221 * the drive is available again. 222 */ 223 cd->device->changed = 1; 224 /* This will force a flush, if called from check_disk_change */ 225 retval = 1; 226 goto out; 227 }; 228 229 retval = cd->device->changed; 230 cd->device->changed = 0; 231 /* If the disk changed, the capacity will now be different, 232 * so we force a re-read of this information */ 233 if (retval) { 234 /* check multisession offset etc */ 235 sr_cd_check(cdi); 236 get_sectorsize(cd); 237 } 238 239 out: 240 /* Notify userspace, that media has changed. */ 241 if (retval != cd->previous_state) 242 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, 243 GFP_KERNEL); 244 cd->previous_state = retval; 245 kfree(sshdr); 246 247 return retval; 248 } 249 250 /* 251 * sr_done is the interrupt routine for the device driver. 252 * 253 * It will be notified on the end of a SCSI read / write, and will take one 254 * of several actions based on success or failure. 255 */ 256 static int sr_done(struct scsi_cmnd *SCpnt) 257 { 258 int result = SCpnt->result; 259 int this_count = scsi_bufflen(SCpnt); 260 int good_bytes = (result == 0 ? this_count : 0); 261 int block_sectors = 0; 262 long error_sector; 263 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 264 265 #ifdef DEBUG 266 printk("sr.c done: %x\n", result); 267 #endif 268 269 /* 270 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 271 * success. Since this is a relatively rare error condition, no 272 * care is taken to avoid unnecessary additional work such as 273 * memcpy's that could be avoided. 274 */ 275 if (driver_byte(result) != 0 && /* An error occurred */ 276 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 277 switch (SCpnt->sense_buffer[2]) { 278 case MEDIUM_ERROR: 279 case VOLUME_OVERFLOW: 280 case ILLEGAL_REQUEST: 281 if (!(SCpnt->sense_buffer[0] & 0x90)) 282 break; 283 error_sector = (SCpnt->sense_buffer[3] << 24) | 284 (SCpnt->sense_buffer[4] << 16) | 285 (SCpnt->sense_buffer[5] << 8) | 286 SCpnt->sense_buffer[6]; 287 if (SCpnt->request->bio != NULL) 288 block_sectors = 289 bio_sectors(SCpnt->request->bio); 290 if (block_sectors < 4) 291 block_sectors = 4; 292 if (cd->device->sector_size == 2048) 293 error_sector <<= 2; 294 error_sector &= ~(block_sectors - 1); 295 good_bytes = (error_sector - 296 blk_rq_pos(SCpnt->request)) << 9; 297 if (good_bytes < 0 || good_bytes >= this_count) 298 good_bytes = 0; 299 /* 300 * The SCSI specification allows for the value 301 * returned by READ CAPACITY to be up to 75 2K 302 * sectors past the last readable block. 303 * Therefore, if we hit a medium error within the 304 * last 75 2K sectors, we decrease the saved size 305 * value. 306 */ 307 if (error_sector < get_capacity(cd->disk) && 308 cd->capacity - error_sector < 4 * 75) 309 set_capacity(cd->disk, error_sector); 310 break; 311 312 case RECOVERED_ERROR: 313 good_bytes = this_count; 314 break; 315 316 default: 317 break; 318 } 319 } 320 321 return good_bytes; 322 } 323 324 static int sr_prep_fn(struct request_queue *q, struct request *rq) 325 { 326 int block = 0, this_count, s_size; 327 struct scsi_cd *cd; 328 struct scsi_cmnd *SCpnt; 329 struct scsi_device *sdp = q->queuedata; 330 int ret; 331 332 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 333 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 334 goto out; 335 } else if (rq->cmd_type != REQ_TYPE_FS) { 336 ret = BLKPREP_KILL; 337 goto out; 338 } 339 ret = scsi_setup_fs_cmnd(sdp, rq); 340 if (ret != BLKPREP_OK) 341 goto out; 342 SCpnt = rq->special; 343 cd = scsi_cd(rq->rq_disk); 344 345 /* from here on until we're complete, any goto out 346 * is used for a killable error condition */ 347 ret = BLKPREP_KILL; 348 349 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 350 cd->disk->disk_name, block)); 351 352 if (!cd->device || !scsi_device_online(cd->device)) { 353 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", 354 blk_rq_sectors(rq))); 355 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 356 goto out; 357 } 358 359 if (cd->device->changed) { 360 /* 361 * quietly refuse to do anything to a changed disc until the 362 * changed bit has been reset 363 */ 364 goto out; 365 } 366 367 /* 368 * we do lazy blocksize switching (when reading XA sectors, 369 * see CDROMREADMODE2 ioctl) 370 */ 371 s_size = cd->device->sector_size; 372 if (s_size > 2048) { 373 if (!in_interrupt()) 374 sr_set_blocklength(cd, 2048); 375 else 376 printk("sr: can't switch blocksize: in interrupt\n"); 377 } 378 379 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 380 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 381 goto out; 382 } 383 384 if (rq_data_dir(rq) == WRITE) { 385 if (!cd->device->writeable) 386 goto out; 387 SCpnt->cmnd[0] = WRITE_10; 388 SCpnt->sc_data_direction = DMA_TO_DEVICE; 389 cd->cdi.media_written = 1; 390 } else if (rq_data_dir(rq) == READ) { 391 SCpnt->cmnd[0] = READ_10; 392 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 393 } else { 394 blk_dump_rq_flags(rq, "Unknown sr command"); 395 goto out; 396 } 397 398 { 399 struct scatterlist *sg; 400 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 401 402 scsi_for_each_sg(SCpnt, sg, sg_count, i) 403 size += sg->length; 404 405 if (size != scsi_bufflen(SCpnt)) { 406 scmd_printk(KERN_ERR, SCpnt, 407 "mismatch count %d, bytes %d\n", 408 size, scsi_bufflen(SCpnt)); 409 if (scsi_bufflen(SCpnt) > size) 410 SCpnt->sdb.length = size; 411 } 412 } 413 414 /* 415 * request doesn't start on hw block boundary, add scatter pads 416 */ 417 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 418 (scsi_bufflen(SCpnt) % s_size)) { 419 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 420 goto out; 421 } 422 423 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 424 425 426 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", 427 cd->cdi.name, 428 (rq_data_dir(rq) == WRITE) ? 429 "writing" : "reading", 430 this_count, blk_rq_sectors(rq))); 431 432 SCpnt->cmnd[1] = 0; 433 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 434 435 if (this_count > 0xffff) { 436 this_count = 0xffff; 437 SCpnt->sdb.length = this_count * s_size; 438 } 439 440 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 441 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 442 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 443 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 444 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 445 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 446 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 447 448 /* 449 * We shouldn't disconnect in the middle of a sector, so with a dumb 450 * host adapter, it's safe to assume that we can at least transfer 451 * this many bytes between each connect / disconnect. 452 */ 453 SCpnt->transfersize = cd->device->sector_size; 454 SCpnt->underflow = this_count << 9; 455 SCpnt->allowed = MAX_RETRIES; 456 457 /* 458 * This indicates that the command is ready from our end to be 459 * queued. 460 */ 461 ret = BLKPREP_OK; 462 out: 463 return scsi_prep_return(q, rq, ret); 464 } 465 466 static int sr_block_open(struct block_device *bdev, fmode_t mode) 467 { 468 struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk); 469 int ret = -ENXIO; 470 471 if (cd) { 472 ret = cdrom_open(&cd->cdi, bdev, mode); 473 if (ret) 474 scsi_cd_put(cd); 475 } 476 return ret; 477 } 478 479 static int sr_block_release(struct gendisk *disk, fmode_t mode) 480 { 481 struct scsi_cd *cd = scsi_cd(disk); 482 cdrom_release(&cd->cdi, mode); 483 scsi_cd_put(cd); 484 return 0; 485 } 486 487 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 488 unsigned long arg) 489 { 490 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 491 struct scsi_device *sdev = cd->device; 492 void __user *argp = (void __user *)arg; 493 int ret; 494 495 /* 496 * Send SCSI addressing ioctls directly to mid level, send other 497 * ioctls to cdrom/block level. 498 */ 499 switch (cmd) { 500 case SCSI_IOCTL_GET_IDLUN: 501 case SCSI_IOCTL_GET_BUS_NUMBER: 502 return scsi_ioctl(sdev, cmd, argp); 503 } 504 505 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 506 if (ret != -ENOSYS) 507 return ret; 508 509 /* 510 * ENODEV means that we didn't recognise the ioctl, or that we 511 * cannot execute it in the current device state. In either 512 * case fall through to scsi_ioctl, which will return ENDOEV again 513 * if it doesn't recognise the ioctl 514 */ 515 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 516 (mode & FMODE_NDELAY) != 0); 517 if (ret != -ENODEV) 518 return ret; 519 return scsi_ioctl(sdev, cmd, argp); 520 } 521 522 static int sr_block_media_changed(struct gendisk *disk) 523 { 524 struct scsi_cd *cd = scsi_cd(disk); 525 return cdrom_media_changed(&cd->cdi); 526 } 527 528 static struct block_device_operations sr_bdops = 529 { 530 .owner = THIS_MODULE, 531 .open = sr_block_open, 532 .release = sr_block_release, 533 .locked_ioctl = sr_block_ioctl, 534 .media_changed = sr_block_media_changed, 535 /* 536 * No compat_ioctl for now because sr_block_ioctl never 537 * seems to pass arbitary ioctls down to host drivers. 538 */ 539 }; 540 541 static int sr_open(struct cdrom_device_info *cdi, int purpose) 542 { 543 struct scsi_cd *cd = cdi->handle; 544 struct scsi_device *sdev = cd->device; 545 int retval; 546 547 /* 548 * If the device is in error recovery, wait until it is done. 549 * If the device is offline, then disallow any access to it. 550 */ 551 retval = -ENXIO; 552 if (!scsi_block_when_processing_errors(sdev)) 553 goto error_out; 554 555 return 0; 556 557 error_out: 558 return retval; 559 } 560 561 static void sr_release(struct cdrom_device_info *cdi) 562 { 563 struct scsi_cd *cd = cdi->handle; 564 565 if (cd->device->sector_size > 2048) 566 sr_set_blocklength(cd, 2048); 567 568 } 569 570 static int sr_probe(struct device *dev) 571 { 572 struct scsi_device *sdev = to_scsi_device(dev); 573 struct gendisk *disk; 574 struct scsi_cd *cd; 575 int minor, error; 576 577 error = -ENODEV; 578 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 579 goto fail; 580 581 error = -ENOMEM; 582 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 583 if (!cd) 584 goto fail; 585 586 kref_init(&cd->kref); 587 588 disk = alloc_disk(1); 589 if (!disk) 590 goto fail_free; 591 592 spin_lock(&sr_index_lock); 593 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 594 if (minor == SR_DISKS) { 595 spin_unlock(&sr_index_lock); 596 error = -EBUSY; 597 goto fail_put; 598 } 599 __set_bit(minor, sr_index_bits); 600 spin_unlock(&sr_index_lock); 601 602 disk->major = SCSI_CDROM_MAJOR; 603 disk->first_minor = minor; 604 sprintf(disk->disk_name, "sr%d", minor); 605 disk->fops = &sr_bdops; 606 disk->flags = GENHD_FL_CD; 607 608 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 609 610 cd->device = sdev; 611 cd->disk = disk; 612 cd->driver = &sr_template; 613 cd->disk = disk; 614 cd->capacity = 0x1fffff; 615 cd->device->changed = 1; /* force recheck CD type */ 616 cd->previous_state = 1; 617 cd->use = 1; 618 cd->readcd_known = 0; 619 cd->readcd_cdda = 0; 620 621 cd->cdi.ops = &sr_dops; 622 cd->cdi.handle = cd; 623 cd->cdi.mask = 0; 624 cd->cdi.capacity = 1; 625 sprintf(cd->cdi.name, "sr%d", minor); 626 627 sdev->sector_size = 2048; /* A guess, just in case */ 628 629 /* FIXME: need to handle a get_capabilities failure properly ?? */ 630 get_capabilities(cd); 631 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 632 sr_vendor_init(cd); 633 634 disk->driverfs_dev = &sdev->sdev_gendev; 635 set_capacity(disk, cd->capacity); 636 disk->private_data = &cd->driver; 637 disk->queue = sdev->request_queue; 638 cd->cdi.disk = disk; 639 640 if (register_cdrom(&cd->cdi)) 641 goto fail_put; 642 643 dev_set_drvdata(dev, cd); 644 disk->flags |= GENHD_FL_REMOVABLE; 645 add_disk(disk); 646 647 sdev_printk(KERN_DEBUG, sdev, 648 "Attached scsi CD-ROM %s\n", cd->cdi.name); 649 return 0; 650 651 fail_put: 652 put_disk(disk); 653 fail_free: 654 kfree(cd); 655 fail: 656 return error; 657 } 658 659 660 static void get_sectorsize(struct scsi_cd *cd) 661 { 662 unsigned char cmd[10]; 663 unsigned char buffer[8]; 664 int the_result, retries = 3; 665 int sector_size; 666 struct request_queue *queue; 667 668 do { 669 cmd[0] = READ_CAPACITY; 670 memset((void *) &cmd[1], 0, 9); 671 memset(buffer, 0, sizeof(buffer)); 672 673 /* Do the command and wait.. */ 674 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 675 buffer, sizeof(buffer), NULL, 676 SR_TIMEOUT, MAX_RETRIES, NULL); 677 678 retries--; 679 680 } while (the_result && retries); 681 682 683 if (the_result) { 684 cd->capacity = 0x1fffff; 685 sector_size = 2048; /* A guess, just in case */ 686 } else { 687 #if 0 688 if (cdrom_get_last_written(&cd->cdi, 689 &cd->capacity)) 690 #endif 691 cd->capacity = 1 + ((buffer[0] << 24) | 692 (buffer[1] << 16) | 693 (buffer[2] << 8) | 694 buffer[3]); 695 sector_size = (buffer[4] << 24) | 696 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 697 switch (sector_size) { 698 /* 699 * HP 4020i CD-Recorder reports 2340 byte sectors 700 * Philips CD-Writers report 2352 byte sectors 701 * 702 * Use 2k sectors for them.. 703 */ 704 case 0: 705 case 2340: 706 case 2352: 707 sector_size = 2048; 708 /* fall through */ 709 case 2048: 710 cd->capacity *= 4; 711 /* fall through */ 712 case 512: 713 break; 714 default: 715 printk("%s: unsupported sector size %d.\n", 716 cd->cdi.name, sector_size); 717 cd->capacity = 0; 718 } 719 720 cd->device->sector_size = sector_size; 721 722 /* 723 * Add this so that we have the ability to correctly gauge 724 * what the device is capable of. 725 */ 726 set_capacity(cd->disk, cd->capacity); 727 } 728 729 queue = cd->device->request_queue; 730 blk_queue_logical_block_size(queue, sector_size); 731 732 return; 733 } 734 735 static void get_capabilities(struct scsi_cd *cd) 736 { 737 unsigned char *buffer; 738 struct scsi_mode_data data; 739 struct scsi_sense_hdr sshdr; 740 int rc, n; 741 742 static const char *loadmech[] = 743 { 744 "caddy", 745 "tray", 746 "pop-up", 747 "", 748 "changer", 749 "cartridge changer", 750 "", 751 "" 752 }; 753 754 755 /* allocate transfer buffer */ 756 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 757 if (!buffer) { 758 printk(KERN_ERR "sr: out of memory.\n"); 759 return; 760 } 761 762 /* eat unit attentions */ 763 sr_test_unit_ready(cd->device, &sshdr); 764 765 /* ask for mode page 0x2a */ 766 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 767 SR_TIMEOUT, 3, &data, NULL); 768 769 if (!scsi_status_is_good(rc)) { 770 /* failed, drive doesn't have capabilities mode page */ 771 cd->cdi.speed = 1; 772 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 773 CDC_DVD | CDC_DVD_RAM | 774 CDC_SELECT_DISC | CDC_SELECT_SPEED | 775 CDC_MRW | CDC_MRW_W | CDC_RAM); 776 kfree(buffer); 777 printk("%s: scsi-1 drive\n", cd->cdi.name); 778 return; 779 } 780 781 n = data.header_length + data.block_descriptor_length; 782 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 783 cd->readcd_known = 1; 784 cd->readcd_cdda = buffer[n + 5] & 0x01; 785 /* print some capability bits */ 786 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 787 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 788 cd->cdi.speed, 789 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 790 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 791 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 792 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 793 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 794 loadmech[buffer[n + 6] >> 5]); 795 if ((buffer[n + 6] >> 5) == 0) 796 /* caddy drives can't close tray... */ 797 cd->cdi.mask |= CDC_CLOSE_TRAY; 798 if ((buffer[n + 2] & 0x8) == 0) 799 /* not a DVD drive */ 800 cd->cdi.mask |= CDC_DVD; 801 if ((buffer[n + 3] & 0x20) == 0) 802 /* can't write DVD-RAM media */ 803 cd->cdi.mask |= CDC_DVD_RAM; 804 if ((buffer[n + 3] & 0x10) == 0) 805 /* can't write DVD-R media */ 806 cd->cdi.mask |= CDC_DVD_R; 807 if ((buffer[n + 3] & 0x2) == 0) 808 /* can't write CD-RW media */ 809 cd->cdi.mask |= CDC_CD_RW; 810 if ((buffer[n + 3] & 0x1) == 0) 811 /* can't write CD-R media */ 812 cd->cdi.mask |= CDC_CD_R; 813 if ((buffer[n + 6] & 0x8) == 0) 814 /* can't eject */ 815 cd->cdi.mask |= CDC_OPEN_TRAY; 816 817 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 818 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 819 cd->cdi.capacity = 820 cdrom_number_of_slots(&cd->cdi); 821 if (cd->cdi.capacity <= 1) 822 /* not a changer */ 823 cd->cdi.mask |= CDC_SELECT_DISC; 824 /*else I don't think it can close its tray 825 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 826 827 /* 828 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 829 */ 830 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 831 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 832 cd->device->writeable = 1; 833 } 834 835 kfree(buffer); 836 } 837 838 /* 839 * sr_packet() is the entry point for the generic commands generated 840 * by the Uniform CD-ROM layer. 841 */ 842 static int sr_packet(struct cdrom_device_info *cdi, 843 struct packet_command *cgc) 844 { 845 if (cgc->timeout <= 0) 846 cgc->timeout = IOCTL_TIMEOUT; 847 848 sr_do_ioctl(cdi->handle, cgc); 849 850 return cgc->stat; 851 } 852 853 /** 854 * sr_kref_release - Called to free the scsi_cd structure 855 * @kref: pointer to embedded kref 856 * 857 * sr_ref_mutex must be held entering this routine. Because it is 858 * called on last put, you should always use the scsi_cd_get() 859 * scsi_cd_put() helpers which manipulate the semaphore directly 860 * and never do a direct kref_put(). 861 **/ 862 static void sr_kref_release(struct kref *kref) 863 { 864 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 865 struct gendisk *disk = cd->disk; 866 867 spin_lock(&sr_index_lock); 868 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 869 spin_unlock(&sr_index_lock); 870 871 unregister_cdrom(&cd->cdi); 872 873 disk->private_data = NULL; 874 875 put_disk(disk); 876 877 kfree(cd); 878 } 879 880 static int sr_remove(struct device *dev) 881 { 882 struct scsi_cd *cd = dev_get_drvdata(dev); 883 884 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); 885 del_gendisk(cd->disk); 886 887 mutex_lock(&sr_ref_mutex); 888 kref_put(&cd->kref, sr_kref_release); 889 mutex_unlock(&sr_ref_mutex); 890 891 return 0; 892 } 893 894 static int __init init_sr(void) 895 { 896 int rc; 897 898 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 899 if (rc) 900 return rc; 901 rc = scsi_register_driver(&sr_template.gendrv); 902 if (rc) 903 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 904 905 return rc; 906 } 907 908 static void __exit exit_sr(void) 909 { 910 scsi_unregister_driver(&sr_template.gendrv); 911 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 912 } 913 914 module_init(init_sr); 915 module_exit(exit_sr); 916 MODULE_LICENSE("GPL"); 917