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 <linux/smp_lock.h> 48#include <linux/slab.h> 49#include <asm/uaccess.h> 50 51#include <scsi/scsi.h> 52#include <scsi/scsi_dbg.h> 53#include <scsi/scsi_device.h> 54#include <scsi/scsi_driver.h> 55#include <scsi/scsi_cmnd.h> 56#include <scsi/scsi_eh.h> 57#include <scsi/scsi_host.h> 58#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 59 60#include "scsi_logging.h" 61#include "sr.h" 62 63 64MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 65MODULE_LICENSE("GPL"); 66MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 67MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 68MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 69 70#define SR_DISKS 256 71 72#define SR_CAPABILITIES \ 73 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 74 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 75 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 76 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 77 CDC_MRW|CDC_MRW_W|CDC_RAM) 78 79static int sr_probe(struct device *); 80static int sr_remove(struct device *); 81static int sr_done(struct scsi_cmnd *); 82 83static struct scsi_driver sr_template = { 84 .owner = THIS_MODULE, 85 .gendrv = { 86 .name = "sr", 87 .probe = sr_probe, 88 .remove = sr_remove, 89 }, 90 .done = sr_done, 91}; 92 93static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 94static DEFINE_SPINLOCK(sr_index_lock); 95 96/* This semaphore is used to mediate the 0->1 reference get in the 97 * face of object destruction (i.e. we can't allow a get on an 98 * object after last put) */ 99static DEFINE_MUTEX(sr_ref_mutex); 100 101static int sr_open(struct cdrom_device_info *, int); 102static void sr_release(struct cdrom_device_info *); 103 104static void get_sectorsize(struct scsi_cd *); 105static void get_capabilities(struct scsi_cd *); 106 107static int sr_media_change(struct cdrom_device_info *, int); 108static int sr_packet(struct cdrom_device_info *, struct packet_command *); 109 110static struct cdrom_device_ops sr_dops = { 111 .open = sr_open, 112 .release = sr_release, 113 .drive_status = sr_drive_status, 114 .media_changed = sr_media_change, 115 .tray_move = sr_tray_move, 116 .lock_door = sr_lock_door, 117 .select_speed = sr_select_speed, 118 .get_last_session = sr_get_last_session, 119 .get_mcn = sr_get_mcn, 120 .reset = sr_reset, 121 .audio_ioctl = sr_audio_ioctl, 122 .capability = SR_CAPABILITIES, 123 .generic_packet = sr_packet, 124}; 125 126static void sr_kref_release(struct kref *kref); 127 128static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 129{ 130 return container_of(disk->private_data, struct scsi_cd, driver); 131} 132 133/* 134 * The get and put routines for the struct scsi_cd. Note this entity 135 * has a scsi_device pointer and owns a reference to this. 136 */ 137static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 138{ 139 struct scsi_cd *cd = NULL; 140 141 mutex_lock(&sr_ref_mutex); 142 if (disk->private_data == NULL) 143 goto out; 144 cd = scsi_cd(disk); 145 kref_get(&cd->kref); 146 if (scsi_device_get(cd->device)) 147 goto out_put; 148 goto out; 149 150 out_put: 151 kref_put(&cd->kref, sr_kref_release); 152 cd = NULL; 153 out: 154 mutex_unlock(&sr_ref_mutex); 155 return cd; 156} 157 158static void scsi_cd_put(struct scsi_cd *cd) 159{ 160 struct scsi_device *sdev = cd->device; 161 162 mutex_lock(&sr_ref_mutex); 163 kref_put(&cd->kref, sr_kref_release); 164 scsi_device_put(sdev); 165 mutex_unlock(&sr_ref_mutex); 166} 167 168/* identical to scsi_test_unit_ready except that it doesn't 169 * eat the NOT_READY returns for removable media */ 170int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) 171{ 172 int retries = MAX_RETRIES; 173 int the_result; 174 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; 175 176 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 177 * conditions are gone, or a timeout happens 178 */ 179 do { 180 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 181 0, sshdr, SR_TIMEOUT, 182 retries--, NULL); 183 if (scsi_sense_valid(sshdr) && 184 sshdr->sense_key == UNIT_ATTENTION) 185 sdev->changed = 1; 186 187 } while (retries > 0 && 188 (!scsi_status_is_good(the_result) || 189 (scsi_sense_valid(sshdr) && 190 sshdr->sense_key == UNIT_ATTENTION))); 191 return the_result; 192} 193 194/* 195 * This function checks to see if the media has been changed in the 196 * CDROM drive. It is possible that we have already sensed a change, 197 * or the drive may have sensed one and not yet reported it. We must 198 * be ready for either case. This function always reports the current 199 * value of the changed bit. If flag is 0, then the changed bit is reset. 200 * This function could be done as an ioctl, but we would need to have 201 * an inode for that to work, and we do not always have one. 202 */ 203 204static int sr_media_change(struct cdrom_device_info *cdi, int slot) 205{ 206 struct scsi_cd *cd = cdi->handle; 207 int retval; 208 struct scsi_sense_hdr *sshdr; 209 210 if (CDSL_CURRENT != slot) { 211 /* no changer support */ 212 return -EINVAL; 213 } 214 215 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 216 retval = sr_test_unit_ready(cd->device, sshdr); 217 if (retval || (scsi_sense_valid(sshdr) && 218 /* 0x3a is medium not present */ 219 sshdr->asc == 0x3a)) { 220 /* Media not present or unable to test, unit probably not 221 * ready. This usually means there is no disc in the drive. 222 * Mark as changed, and we will figure it out later once 223 * the drive is available again. 224 */ 225 cd->device->changed = 1; 226 /* This will force a flush, if called from check_disk_change */ 227 retval = 1; 228 goto out; 229 }; 230 231 retval = cd->device->changed; 232 cd->device->changed = 0; 233 /* If the disk changed, the capacity will now be different, 234 * so we force a re-read of this information */ 235 if (retval) { 236 /* check multisession offset etc */ 237 sr_cd_check(cdi); 238 get_sectorsize(cd); 239 } 240 241out: 242 /* Notify userspace, that media has changed. */ 243 if (retval != cd->previous_state) 244 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, 245 GFP_KERNEL); 246 cd->previous_state = retval; 247 kfree(sshdr); 248 249 return retval; 250} 251 252/* 253 * sr_done is the interrupt routine for the device driver. 254 * 255 * It will be notified on the end of a SCSI read / write, and will take one 256 * of several actions based on success or failure. 257 */ 258static int sr_done(struct scsi_cmnd *SCpnt) 259{ 260 int result = SCpnt->result; 261 int this_count = scsi_bufflen(SCpnt); 262 int good_bytes = (result == 0 ? this_count : 0); 263 int block_sectors = 0; 264 long error_sector; 265 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 266 267#ifdef DEBUG 268 printk("sr.c done: %x\n", result); 269#endif 270 271 /* 272 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 273 * success. Since this is a relatively rare error condition, no 274 * care is taken to avoid unnecessary additional work such as 275 * memcpy's that could be avoided. 276 */ 277 if (driver_byte(result) != 0 && /* An error occurred */ 278 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 279 switch (SCpnt->sense_buffer[2]) { 280 case MEDIUM_ERROR: 281 case VOLUME_OVERFLOW: 282 case ILLEGAL_REQUEST: 283 if (!(SCpnt->sense_buffer[0] & 0x90)) 284 break; 285 error_sector = (SCpnt->sense_buffer[3] << 24) | 286 (SCpnt->sense_buffer[4] << 16) | 287 (SCpnt->sense_buffer[5] << 8) | 288 SCpnt->sense_buffer[6]; 289 if (SCpnt->request->bio != NULL) 290 block_sectors = 291 bio_sectors(SCpnt->request->bio); 292 if (block_sectors < 4) 293 block_sectors = 4; 294 if (cd->device->sector_size == 2048) 295 error_sector <<= 2; 296 error_sector &= ~(block_sectors - 1); 297 good_bytes = (error_sector - 298 blk_rq_pos(SCpnt->request)) << 9; 299 if (good_bytes < 0 || good_bytes >= this_count) 300 good_bytes = 0; 301 /* 302 * The SCSI specification allows for the value 303 * returned by READ CAPACITY to be up to 75 2K 304 * sectors past the last readable block. 305 * Therefore, if we hit a medium error within the 306 * last 75 2K sectors, we decrease the saved size 307 * value. 308 */ 309 if (error_sector < get_capacity(cd->disk) && 310 cd->capacity - error_sector < 4 * 75) 311 set_capacity(cd->disk, error_sector); 312 break; 313 314 case RECOVERED_ERROR: 315 good_bytes = this_count; 316 break; 317 318 default: 319 break; 320 } 321 } 322 323 return good_bytes; 324} 325 326static int sr_prep_fn(struct request_queue *q, struct request *rq) 327{ 328 int block = 0, this_count, s_size; 329 struct scsi_cd *cd; 330 struct scsi_cmnd *SCpnt; 331 struct scsi_device *sdp = q->queuedata; 332 int ret; 333 334 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 335 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 336 goto out; 337 } else if (rq->cmd_type != REQ_TYPE_FS) { 338 ret = BLKPREP_KILL; 339 goto out; 340 } 341 ret = scsi_setup_fs_cmnd(sdp, rq); 342 if (ret != BLKPREP_OK) 343 goto out; 344 SCpnt = rq->special; 345 cd = scsi_cd(rq->rq_disk); 346 347 /* from here on until we're complete, any goto out 348 * is used for a killable error condition */ 349 ret = BLKPREP_KILL; 350 351 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 352 cd->disk->disk_name, block)); 353 354 if (!cd->device || !scsi_device_online(cd->device)) { 355 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", 356 blk_rq_sectors(rq))); 357 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 358 goto out; 359 } 360 361 if (cd->device->changed) { 362 /* 363 * quietly refuse to do anything to a changed disc until the 364 * changed bit has been reset 365 */ 366 goto out; 367 } 368 369 /* 370 * we do lazy blocksize switching (when reading XA sectors, 371 * see CDROMREADMODE2 ioctl) 372 */ 373 s_size = cd->device->sector_size; 374 if (s_size > 2048) { 375 if (!in_interrupt()) 376 sr_set_blocklength(cd, 2048); 377 else 378 printk("sr: can't switch blocksize: in interrupt\n"); 379 } 380 381 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 382 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 383 goto out; 384 } 385 386 if (rq_data_dir(rq) == WRITE) { 387 if (!cd->device->writeable) 388 goto out; 389 SCpnt->cmnd[0] = WRITE_10; 390 SCpnt->sc_data_direction = DMA_TO_DEVICE; 391 cd->cdi.media_written = 1; 392 } else if (rq_data_dir(rq) == READ) { 393 SCpnt->cmnd[0] = READ_10; 394 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 395 } else { 396 blk_dump_rq_flags(rq, "Unknown sr command"); 397 goto out; 398 } 399 400 { 401 struct scatterlist *sg; 402 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 403 404 scsi_for_each_sg(SCpnt, sg, sg_count, i) 405 size += sg->length; 406 407 if (size != scsi_bufflen(SCpnt)) { 408 scmd_printk(KERN_ERR, SCpnt, 409 "mismatch count %d, bytes %d\n", 410 size, scsi_bufflen(SCpnt)); 411 if (scsi_bufflen(SCpnt) > size) 412 SCpnt->sdb.length = size; 413 } 414 } 415 416 /* 417 * request doesn't start on hw block boundary, add scatter pads 418 */ 419 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 420 (scsi_bufflen(SCpnt) % s_size)) { 421 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 422 goto out; 423 } 424 425 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 426 427 428 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", 429 cd->cdi.name, 430 (rq_data_dir(rq) == WRITE) ? 431 "writing" : "reading", 432 this_count, blk_rq_sectors(rq))); 433 434 SCpnt->cmnd[1] = 0; 435 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 436 437 if (this_count > 0xffff) { 438 this_count = 0xffff; 439 SCpnt->sdb.length = this_count * s_size; 440 } 441 442 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 443 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 444 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 445 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 446 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 447 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 448 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 449 450 /* 451 * We shouldn't disconnect in the middle of a sector, so with a dumb 452 * host adapter, it's safe to assume that we can at least transfer 453 * this many bytes between each connect / disconnect. 454 */ 455 SCpnt->transfersize = cd->device->sector_size; 456 SCpnt->underflow = this_count << 9; 457 SCpnt->allowed = MAX_RETRIES; 458 459 /* 460 * This indicates that the command is ready from our end to be 461 * queued. 462 */ 463 ret = BLKPREP_OK; 464 out: 465 return scsi_prep_return(q, rq, ret); 466} 467 468static int sr_block_open(struct block_device *bdev, fmode_t mode) 469{ 470 struct scsi_cd *cd; 471 int ret = -ENXIO; 472 473 lock_kernel(); 474 cd = scsi_cd_get(bdev->bd_disk); 475 if (cd) { 476 ret = cdrom_open(&cd->cdi, bdev, mode); 477 if (ret) 478 scsi_cd_put(cd); 479 } 480 unlock_kernel(); 481 return ret; 482} 483 484static int sr_block_release(struct gendisk *disk, fmode_t mode) 485{ 486 struct scsi_cd *cd = scsi_cd(disk); 487 lock_kernel(); 488 cdrom_release(&cd->cdi, mode); 489 scsi_cd_put(cd); 490 unlock_kernel(); 491 return 0; 492} 493 494static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 495 unsigned long arg) 496{ 497 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 498 struct scsi_device *sdev = cd->device; 499 void __user *argp = (void __user *)arg; 500 int ret; 501 502 lock_kernel(); 503 504 /* 505 * Send SCSI addressing ioctls directly to mid level, send other 506 * ioctls to cdrom/block level. 507 */ 508 switch (cmd) { 509 case SCSI_IOCTL_GET_IDLUN: 510 case SCSI_IOCTL_GET_BUS_NUMBER: 511 ret = scsi_ioctl(sdev, cmd, argp); 512 goto out; 513 } 514 515 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 516 if (ret != -ENOSYS) 517 goto out; 518 519 /* 520 * ENODEV means that we didn't recognise the ioctl, or that we 521 * cannot execute it in the current device state. In either 522 * case fall through to scsi_ioctl, which will return ENDOEV again 523 * if it doesn't recognise the ioctl 524 */ 525 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 526 (mode & FMODE_NDELAY) != 0); 527 if (ret != -ENODEV) 528 goto out; 529 ret = scsi_ioctl(sdev, cmd, argp); 530 531out: 532 unlock_kernel(); 533 return ret; 534} 535 536static int sr_block_media_changed(struct gendisk *disk) 537{ 538 struct scsi_cd *cd = scsi_cd(disk); 539 return cdrom_media_changed(&cd->cdi); 540} 541 542static const struct block_device_operations sr_bdops = 543{ 544 .owner = THIS_MODULE, 545 .open = sr_block_open, 546 .release = sr_block_release, 547 .ioctl = sr_block_ioctl, 548 .media_changed = sr_block_media_changed, 549 /* 550 * No compat_ioctl for now because sr_block_ioctl never 551 * seems to pass arbitary ioctls down to host drivers. 552 */ 553}; 554 555static int sr_open(struct cdrom_device_info *cdi, int purpose) 556{ 557 struct scsi_cd *cd = cdi->handle; 558 struct scsi_device *sdev = cd->device; 559 int retval; 560 561 /* 562 * If the device is in error recovery, wait until it is done. 563 * If the device is offline, then disallow any access to it. 564 */ 565 retval = -ENXIO; 566 if (!scsi_block_when_processing_errors(sdev)) 567 goto error_out; 568 569 return 0; 570 571error_out: 572 return retval; 573} 574 575static void sr_release(struct cdrom_device_info *cdi) 576{ 577 struct scsi_cd *cd = cdi->handle; 578 579 if (cd->device->sector_size > 2048) 580 sr_set_blocklength(cd, 2048); 581 582} 583 584static int sr_probe(struct device *dev) 585{ 586 struct scsi_device *sdev = to_scsi_device(dev); 587 struct gendisk *disk; 588 struct scsi_cd *cd; 589 int minor, error; 590 591 error = -ENODEV; 592 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 593 goto fail; 594 595 error = -ENOMEM; 596 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 597 if (!cd) 598 goto fail; 599 600 kref_init(&cd->kref); 601 602 disk = alloc_disk(1); 603 if (!disk) 604 goto fail_free; 605 606 spin_lock(&sr_index_lock); 607 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 608 if (minor == SR_DISKS) { 609 spin_unlock(&sr_index_lock); 610 error = -EBUSY; 611 goto fail_put; 612 } 613 __set_bit(minor, sr_index_bits); 614 spin_unlock(&sr_index_lock); 615 616 disk->major = SCSI_CDROM_MAJOR; 617 disk->first_minor = minor; 618 sprintf(disk->disk_name, "sr%d", minor); 619 disk->fops = &sr_bdops; 620 disk->flags = GENHD_FL_CD; 621 622 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 623 624 cd->device = sdev; 625 cd->disk = disk; 626 cd->driver = &sr_template; 627 cd->disk = disk; 628 cd->capacity = 0x1fffff; 629 cd->device->changed = 1; /* force recheck CD type */ 630 cd->previous_state = 1; 631 cd->use = 1; 632 cd->readcd_known = 0; 633 cd->readcd_cdda = 0; 634 635 cd->cdi.ops = &sr_dops; 636 cd->cdi.handle = cd; 637 cd->cdi.mask = 0; 638 cd->cdi.capacity = 1; 639 sprintf(cd->cdi.name, "sr%d", minor); 640 641 sdev->sector_size = 2048; /* A guess, just in case */ 642 643 get_capabilities(cd); 644 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 645 sr_vendor_init(cd); 646 647 disk->driverfs_dev = &sdev->sdev_gendev; 648 set_capacity(disk, cd->capacity); 649 disk->private_data = &cd->driver; 650 disk->queue = sdev->request_queue; 651 cd->cdi.disk = disk; 652 653 if (register_cdrom(&cd->cdi)) 654 goto fail_put; 655 656 dev_set_drvdata(dev, cd); 657 disk->flags |= GENHD_FL_REMOVABLE; 658 add_disk(disk); 659 660 sdev_printk(KERN_DEBUG, sdev, 661 "Attached scsi CD-ROM %s\n", cd->cdi.name); 662 return 0; 663 664fail_put: 665 put_disk(disk); 666fail_free: 667 kfree(cd); 668fail: 669 return error; 670} 671 672 673static void get_sectorsize(struct scsi_cd *cd) 674{ 675 unsigned char cmd[10]; 676 unsigned char buffer[8]; 677 int the_result, retries = 3; 678 int sector_size; 679 struct request_queue *queue; 680 681 do { 682 cmd[0] = READ_CAPACITY; 683 memset((void *) &cmd[1], 0, 9); 684 memset(buffer, 0, sizeof(buffer)); 685 686 /* Do the command and wait.. */ 687 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 688 buffer, sizeof(buffer), NULL, 689 SR_TIMEOUT, MAX_RETRIES, NULL); 690 691 retries--; 692 693 } while (the_result && retries); 694 695 696 if (the_result) { 697 cd->capacity = 0x1fffff; 698 sector_size = 2048; /* A guess, just in case */ 699 } else { 700 long last_written; 701 702 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 703 (buffer[2] << 8) | buffer[3]); 704 /* 705 * READ_CAPACITY doesn't return the correct size on 706 * certain UDF media. If last_written is larger, use 707 * it instead. 708 * 709 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 710 */ 711 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 712 cd->capacity = max_t(long, cd->capacity, last_written); 713 714 sector_size = (buffer[4] << 24) | 715 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 716 switch (sector_size) { 717 /* 718 * HP 4020i CD-Recorder reports 2340 byte sectors 719 * Philips CD-Writers report 2352 byte sectors 720 * 721 * Use 2k sectors for them.. 722 */ 723 case 0: 724 case 2340: 725 case 2352: 726 sector_size = 2048; 727 /* fall through */ 728 case 2048: 729 cd->capacity *= 4; 730 /* fall through */ 731 case 512: 732 break; 733 default: 734 printk("%s: unsupported sector size %d.\n", 735 cd->cdi.name, sector_size); 736 cd->capacity = 0; 737 } 738 739 cd->device->sector_size = sector_size; 740 741 /* 742 * Add this so that we have the ability to correctly gauge 743 * what the device is capable of. 744 */ 745 set_capacity(cd->disk, cd->capacity); 746 } 747 748 queue = cd->device->request_queue; 749 blk_queue_logical_block_size(queue, sector_size); 750 751 return; 752} 753 754static void get_capabilities(struct scsi_cd *cd) 755{ 756 unsigned char *buffer; 757 struct scsi_mode_data data; 758 struct scsi_sense_hdr sshdr; 759 int rc, n; 760 761 static const char *loadmech[] = 762 { 763 "caddy", 764 "tray", 765 "pop-up", 766 "", 767 "changer", 768 "cartridge changer", 769 "", 770 "" 771 }; 772 773 774 /* allocate transfer buffer */ 775 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 776 if (!buffer) { 777 printk(KERN_ERR "sr: out of memory.\n"); 778 return; 779 } 780 781 /* eat unit attentions */ 782 sr_test_unit_ready(cd->device, &sshdr); 783 784 /* ask for mode page 0x2a */ 785 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 786 SR_TIMEOUT, 3, &data, NULL); 787 788 if (!scsi_status_is_good(rc)) { 789 /* failed, drive doesn't have capabilities mode page */ 790 cd->cdi.speed = 1; 791 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 792 CDC_DVD | CDC_DVD_RAM | 793 CDC_SELECT_DISC | CDC_SELECT_SPEED | 794 CDC_MRW | CDC_MRW_W | CDC_RAM); 795 kfree(buffer); 796 printk("%s: scsi-1 drive\n", cd->cdi.name); 797 return; 798 } 799 800 n = data.header_length + data.block_descriptor_length; 801 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 802 cd->readcd_known = 1; 803 cd->readcd_cdda = buffer[n + 5] & 0x01; 804 /* print some capability bits */ 805 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 806 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 807 cd->cdi.speed, 808 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 809 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 810 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 811 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 812 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 813 loadmech[buffer[n + 6] >> 5]); 814 if ((buffer[n + 6] >> 5) == 0) 815 /* caddy drives can't close tray... */ 816 cd->cdi.mask |= CDC_CLOSE_TRAY; 817 if ((buffer[n + 2] & 0x8) == 0) 818 /* not a DVD drive */ 819 cd->cdi.mask |= CDC_DVD; 820 if ((buffer[n + 3] & 0x20) == 0) 821 /* can't write DVD-RAM media */ 822 cd->cdi.mask |= CDC_DVD_RAM; 823 if ((buffer[n + 3] & 0x10) == 0) 824 /* can't write DVD-R media */ 825 cd->cdi.mask |= CDC_DVD_R; 826 if ((buffer[n + 3] & 0x2) == 0) 827 /* can't write CD-RW media */ 828 cd->cdi.mask |= CDC_CD_RW; 829 if ((buffer[n + 3] & 0x1) == 0) 830 /* can't write CD-R media */ 831 cd->cdi.mask |= CDC_CD_R; 832 if ((buffer[n + 6] & 0x8) == 0) 833 /* can't eject */ 834 cd->cdi.mask |= CDC_OPEN_TRAY; 835 836 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 837 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 838 cd->cdi.capacity = 839 cdrom_number_of_slots(&cd->cdi); 840 if (cd->cdi.capacity <= 1) 841 /* not a changer */ 842 cd->cdi.mask |= CDC_SELECT_DISC; 843 /*else I don't think it can close its tray 844 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 845 846 /* 847 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 848 */ 849 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 850 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 851 cd->device->writeable = 1; 852 } 853 854 kfree(buffer); 855} 856 857/* 858 * sr_packet() is the entry point for the generic commands generated 859 * by the Uniform CD-ROM layer. 860 */ 861static int sr_packet(struct cdrom_device_info *cdi, 862 struct packet_command *cgc) 863{ 864 if (cgc->timeout <= 0) 865 cgc->timeout = IOCTL_TIMEOUT; 866 867 sr_do_ioctl(cdi->handle, cgc); 868 869 return cgc->stat; 870} 871 872/** 873 * sr_kref_release - Called to free the scsi_cd structure 874 * @kref: pointer to embedded kref 875 * 876 * sr_ref_mutex must be held entering this routine. Because it is 877 * called on last put, you should always use the scsi_cd_get() 878 * scsi_cd_put() helpers which manipulate the semaphore directly 879 * and never do a direct kref_put(). 880 **/ 881static void sr_kref_release(struct kref *kref) 882{ 883 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 884 struct gendisk *disk = cd->disk; 885 886 spin_lock(&sr_index_lock); 887 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 888 spin_unlock(&sr_index_lock); 889 890 unregister_cdrom(&cd->cdi); 891 892 disk->private_data = NULL; 893 894 put_disk(disk); 895 896 kfree(cd); 897} 898 899static int sr_remove(struct device *dev) 900{ 901 struct scsi_cd *cd = dev_get_drvdata(dev); 902 903 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); 904 del_gendisk(cd->disk); 905 906 mutex_lock(&sr_ref_mutex); 907 kref_put(&cd->kref, sr_kref_release); 908 mutex_unlock(&sr_ref_mutex); 909 910 return 0; 911} 912 913static int __init init_sr(void) 914{ 915 int rc; 916 917 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 918 if (rc) 919 return rc; 920 rc = scsi_register_driver(&sr_template.gendrv); 921 if (rc) 922 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 923 924 return rc; 925} 926 927static void __exit exit_sr(void) 928{ 929 scsi_unregister_driver(&sr_template.gendrv); 930 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 931} 932 933module_init(init_sr); 934module_exit(exit_sr); 935MODULE_LICENSE("GPL"); 936