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 MAX_RETRIES 3 71 #define SR_TIMEOUT (30 * HZ) 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 79 static int sr_probe(struct device *); 80 static int sr_remove(struct device *); 81 static int sr_done(struct scsi_cmnd *); 82 83 static 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 93 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 94 static 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) */ 99 static DEFINE_MUTEX(sr_ref_mutex); 100 101 static int sr_open(struct cdrom_device_info *, int); 102 static void sr_release(struct cdrom_device_info *); 103 104 static void get_sectorsize(struct scsi_cd *); 105 static void get_capabilities(struct scsi_cd *); 106 107 static int sr_media_change(struct cdrom_device_info *, int); 108 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 109 110 static 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 }; 125 126 static void sr_kref_release(struct kref *kref); 127 128 static 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 */ 137 static 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 } 157 158 static 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 /* 169 * This function checks to see if the media has been changed in the 170 * CDROM drive. It is possible that we have already sensed a change, 171 * or the drive may have sensed one and not yet reported it. We must 172 * be ready for either case. This function always reports the current 173 * value of the changed bit. If flag is 0, then the changed bit is reset. 174 * This function could be done as an ioctl, but we would need to have 175 * an inode for that to work, and we do not always have one. 176 */ 177 178 static int sr_media_change(struct cdrom_device_info *cdi, int slot) 179 { 180 struct scsi_cd *cd = cdi->handle; 181 int retval; 182 183 if (CDSL_CURRENT != slot) { 184 /* no changer support */ 185 return -EINVAL; 186 } 187 188 retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES); 189 if (retval) { 190 /* Unable to test, unit probably not ready. This usually 191 * means there is no disc in the drive. Mark as changed, 192 * and we will figure it out later once the drive is 193 * available again. */ 194 cd->device->changed = 1; 195 return 1; /* This will force a flush, if called from 196 * check_disk_change */ 197 }; 198 199 retval = cd->device->changed; 200 cd->device->changed = 0; 201 /* If the disk changed, the capacity will now be different, 202 * so we force a re-read of this information */ 203 if (retval) { 204 /* check multisession offset etc */ 205 sr_cd_check(cdi); 206 207 get_sectorsize(cd); 208 } 209 return retval; 210 } 211 212 /* 213 * sr_done is the interrupt routine for the device driver. 214 * 215 * It will be notified on the end of a SCSI read / write, and will take one 216 * of several actions based on success or failure. 217 */ 218 static int sr_done(struct scsi_cmnd *SCpnt) 219 { 220 int result = SCpnt->result; 221 int this_count = SCpnt->request_bufflen; 222 int good_bytes = (result == 0 ? this_count : 0); 223 int block_sectors = 0; 224 long error_sector; 225 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 226 227 #ifdef DEBUG 228 printk("sr.c done: %x\n", result); 229 #endif 230 231 /* 232 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 233 * success. Since this is a relatively rare error condition, no 234 * care is taken to avoid unnecessary additional work such as 235 * memcpy's that could be avoided. 236 */ 237 if (driver_byte(result) != 0 && /* An error occurred */ 238 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 239 switch (SCpnt->sense_buffer[2]) { 240 case MEDIUM_ERROR: 241 case VOLUME_OVERFLOW: 242 case ILLEGAL_REQUEST: 243 if (!(SCpnt->sense_buffer[0] & 0x90)) 244 break; 245 error_sector = (SCpnt->sense_buffer[3] << 24) | 246 (SCpnt->sense_buffer[4] << 16) | 247 (SCpnt->sense_buffer[5] << 8) | 248 SCpnt->sense_buffer[6]; 249 if (SCpnt->request->bio != NULL) 250 block_sectors = 251 bio_sectors(SCpnt->request->bio); 252 if (block_sectors < 4) 253 block_sectors = 4; 254 if (cd->device->sector_size == 2048) 255 error_sector <<= 2; 256 error_sector &= ~(block_sectors - 1); 257 good_bytes = (error_sector - SCpnt->request->sector) << 9; 258 if (good_bytes < 0 || good_bytes >= this_count) 259 good_bytes = 0; 260 /* 261 * The SCSI specification allows for the value 262 * returned by READ CAPACITY to be up to 75 2K 263 * sectors past the last readable block. 264 * Therefore, if we hit a medium error within the 265 * last 75 2K sectors, we decrease the saved size 266 * value. 267 */ 268 if (error_sector < get_capacity(cd->disk) && 269 cd->capacity - error_sector < 4 * 75) 270 set_capacity(cd->disk, error_sector); 271 break; 272 273 case RECOVERED_ERROR: 274 275 /* 276 * An error occured, but it recovered. Inform the 277 * user, but make sure that it's not treated as a 278 * hard error. 279 */ 280 scsi_print_sense("sr", SCpnt); 281 SCpnt->result = 0; 282 SCpnt->sense_buffer[0] = 0x0; 283 good_bytes = this_count; 284 break; 285 286 default: 287 break; 288 } 289 } 290 291 return good_bytes; 292 } 293 294 static int sr_prep_fn(struct request_queue *q, struct request *rq) 295 { 296 int block=0, this_count, s_size, timeout = SR_TIMEOUT; 297 struct scsi_cd *cd; 298 struct scsi_cmnd *SCpnt; 299 struct scsi_device *sdp = q->queuedata; 300 int ret; 301 302 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 303 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 304 goto out; 305 } else if (rq->cmd_type != REQ_TYPE_FS) { 306 ret = BLKPREP_KILL; 307 goto out; 308 } 309 ret = scsi_setup_fs_cmnd(sdp, rq); 310 if (ret != BLKPREP_OK) 311 goto out; 312 SCpnt = rq->special; 313 cd = scsi_cd(rq->rq_disk); 314 315 /* from here on until we're complete, any goto out 316 * is used for a killable error condition */ 317 ret = BLKPREP_KILL; 318 319 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 320 cd->disk->disk_name, block)); 321 322 if (!cd->device || !scsi_device_online(cd->device)) { 323 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", 324 rq->nr_sectors)); 325 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 326 goto out; 327 } 328 329 if (cd->device->changed) { 330 /* 331 * quietly refuse to do anything to a changed disc until the 332 * changed bit has been reset 333 */ 334 goto out; 335 } 336 337 /* 338 * we do lazy blocksize switching (when reading XA sectors, 339 * see CDROMREADMODE2 ioctl) 340 */ 341 s_size = cd->device->sector_size; 342 if (s_size > 2048) { 343 if (!in_interrupt()) 344 sr_set_blocklength(cd, 2048); 345 else 346 printk("sr: can't switch blocksize: in interrupt\n"); 347 } 348 349 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 350 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 351 goto out; 352 } 353 354 if (rq_data_dir(rq) == WRITE) { 355 if (!cd->device->writeable) 356 goto out; 357 SCpnt->cmnd[0] = WRITE_10; 358 SCpnt->sc_data_direction = DMA_TO_DEVICE; 359 cd->cdi.media_written = 1; 360 } else if (rq_data_dir(rq) == READ) { 361 SCpnt->cmnd[0] = READ_10; 362 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 363 } else { 364 blk_dump_rq_flags(rq, "Unknown sr command"); 365 goto out; 366 } 367 368 { 369 struct scatterlist *sg = SCpnt->request_buffer; 370 int i, size = 0; 371 for (i = 0; i < SCpnt->use_sg; i++) 372 size += sg[i].length; 373 374 if (size != SCpnt->request_bufflen && SCpnt->use_sg) { 375 scmd_printk(KERN_ERR, SCpnt, 376 "mismatch count %d, bytes %d\n", 377 size, SCpnt->request_bufflen); 378 if (SCpnt->request_bufflen > size) 379 SCpnt->request_bufflen = size; 380 } 381 } 382 383 /* 384 * request doesn't start on hw block boundary, add scatter pads 385 */ 386 if (((unsigned int)rq->sector % (s_size >> 9)) || 387 (SCpnt->request_bufflen % s_size)) { 388 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 389 goto out; 390 } 391 392 this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9); 393 394 395 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", 396 cd->cdi.name, 397 (rq_data_dir(rq) == WRITE) ? 398 "writing" : "reading", 399 this_count, rq->nr_sectors)); 400 401 SCpnt->cmnd[1] = 0; 402 block = (unsigned int)rq->sector / (s_size >> 9); 403 404 if (this_count > 0xffff) { 405 this_count = 0xffff; 406 SCpnt->request_bufflen = this_count * s_size; 407 } 408 409 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 410 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 411 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 412 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 413 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 414 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 415 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 416 417 /* 418 * We shouldn't disconnect in the middle of a sector, so with a dumb 419 * host adapter, it's safe to assume that we can at least transfer 420 * this many bytes between each connect / disconnect. 421 */ 422 SCpnt->transfersize = cd->device->sector_size; 423 SCpnt->underflow = this_count << 9; 424 SCpnt->allowed = MAX_RETRIES; 425 SCpnt->timeout_per_command = timeout; 426 427 /* 428 * This indicates that the command is ready from our end to be 429 * queued. 430 */ 431 ret = BLKPREP_OK; 432 out: 433 return scsi_prep_return(q, rq, ret); 434 } 435 436 static int sr_block_open(struct inode *inode, struct file *file) 437 { 438 struct gendisk *disk = inode->i_bdev->bd_disk; 439 struct scsi_cd *cd; 440 int ret = 0; 441 442 if(!(cd = scsi_cd_get(disk))) 443 return -ENXIO; 444 445 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) 446 scsi_cd_put(cd); 447 448 return ret; 449 } 450 451 static int sr_block_release(struct inode *inode, struct file *file) 452 { 453 int ret; 454 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 455 ret = cdrom_release(&cd->cdi, file); 456 if(ret) 457 return ret; 458 459 scsi_cd_put(cd); 460 461 return 0; 462 } 463 464 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, 465 unsigned long arg) 466 { 467 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 468 struct scsi_device *sdev = cd->device; 469 void __user *argp = (void __user *)arg; 470 int ret; 471 472 /* 473 * Send SCSI addressing ioctls directly to mid level, send other 474 * ioctls to cdrom/block level. 475 */ 476 switch (cmd) { 477 case SCSI_IOCTL_GET_IDLUN: 478 case SCSI_IOCTL_GET_BUS_NUMBER: 479 return scsi_ioctl(sdev, cmd, argp); 480 } 481 482 ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); 483 if (ret != -ENOSYS) 484 return ret; 485 486 /* 487 * ENODEV means that we didn't recognise the ioctl, or that we 488 * cannot execute it in the current device state. In either 489 * case fall through to scsi_ioctl, which will return ENDOEV again 490 * if it doesn't recognise the ioctl 491 */ 492 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL); 493 if (ret != -ENODEV) 494 return ret; 495 return scsi_ioctl(sdev, cmd, argp); 496 } 497 498 static int sr_block_media_changed(struct gendisk *disk) 499 { 500 struct scsi_cd *cd = scsi_cd(disk); 501 return cdrom_media_changed(&cd->cdi); 502 } 503 504 static struct block_device_operations sr_bdops = 505 { 506 .owner = THIS_MODULE, 507 .open = sr_block_open, 508 .release = sr_block_release, 509 .ioctl = sr_block_ioctl, 510 .media_changed = sr_block_media_changed, 511 /* 512 * No compat_ioctl for now because sr_block_ioctl never 513 * seems to pass arbitary ioctls down to host drivers. 514 */ 515 }; 516 517 static int sr_open(struct cdrom_device_info *cdi, int purpose) 518 { 519 struct scsi_cd *cd = cdi->handle; 520 struct scsi_device *sdev = cd->device; 521 int retval; 522 523 /* 524 * If the device is in error recovery, wait until it is done. 525 * If the device is offline, then disallow any access to it. 526 */ 527 retval = -ENXIO; 528 if (!scsi_block_when_processing_errors(sdev)) 529 goto error_out; 530 531 return 0; 532 533 error_out: 534 return retval; 535 } 536 537 static void sr_release(struct cdrom_device_info *cdi) 538 { 539 struct scsi_cd *cd = cdi->handle; 540 541 if (cd->device->sector_size > 2048) 542 sr_set_blocklength(cd, 2048); 543 544 } 545 546 static int sr_probe(struct device *dev) 547 { 548 struct scsi_device *sdev = to_scsi_device(dev); 549 struct gendisk *disk; 550 struct scsi_cd *cd; 551 int minor, error; 552 553 error = -ENODEV; 554 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 555 goto fail; 556 557 error = -ENOMEM; 558 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 559 if (!cd) 560 goto fail; 561 562 kref_init(&cd->kref); 563 564 disk = alloc_disk(1); 565 if (!disk) 566 goto fail_free; 567 568 spin_lock(&sr_index_lock); 569 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 570 if (minor == SR_DISKS) { 571 spin_unlock(&sr_index_lock); 572 error = -EBUSY; 573 goto fail_put; 574 } 575 __set_bit(minor, sr_index_bits); 576 spin_unlock(&sr_index_lock); 577 578 disk->major = SCSI_CDROM_MAJOR; 579 disk->first_minor = minor; 580 sprintf(disk->disk_name, "sr%d", minor); 581 disk->fops = &sr_bdops; 582 disk->flags = GENHD_FL_CD; 583 584 cd->device = sdev; 585 cd->disk = disk; 586 cd->driver = &sr_template; 587 cd->disk = disk; 588 cd->capacity = 0x1fffff; 589 cd->device->changed = 1; /* force recheck CD type */ 590 cd->use = 1; 591 cd->readcd_known = 0; 592 cd->readcd_cdda = 0; 593 594 cd->cdi.ops = &sr_dops; 595 cd->cdi.handle = cd; 596 cd->cdi.mask = 0; 597 cd->cdi.capacity = 1; 598 sprintf(cd->cdi.name, "sr%d", minor); 599 600 sdev->sector_size = 2048; /* A guess, just in case */ 601 602 /* FIXME: need to handle a get_capabilities failure properly ?? */ 603 get_capabilities(cd); 604 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 605 sr_vendor_init(cd); 606 607 disk->driverfs_dev = &sdev->sdev_gendev; 608 set_capacity(disk, cd->capacity); 609 disk->private_data = &cd->driver; 610 disk->queue = sdev->request_queue; 611 cd->cdi.disk = disk; 612 613 if (register_cdrom(&cd->cdi)) 614 goto fail_put; 615 616 dev_set_drvdata(dev, cd); 617 disk->flags |= GENHD_FL_REMOVABLE; 618 add_disk(disk); 619 620 sdev_printk(KERN_DEBUG, sdev, 621 "Attached scsi CD-ROM %s\n", cd->cdi.name); 622 return 0; 623 624 fail_put: 625 put_disk(disk); 626 fail_free: 627 kfree(cd); 628 fail: 629 return error; 630 } 631 632 633 static void get_sectorsize(struct scsi_cd *cd) 634 { 635 unsigned char cmd[10]; 636 unsigned char *buffer; 637 int the_result, retries = 3; 638 int sector_size; 639 struct request_queue *queue; 640 641 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 642 if (!buffer) 643 goto Enomem; 644 645 do { 646 cmd[0] = READ_CAPACITY; 647 memset((void *) &cmd[1], 0, 9); 648 memset(buffer, 0, 8); 649 650 /* Do the command and wait.. */ 651 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 652 buffer, 8, NULL, SR_TIMEOUT, 653 MAX_RETRIES); 654 655 retries--; 656 657 } while (the_result && retries); 658 659 660 if (the_result) { 661 cd->capacity = 0x1fffff; 662 sector_size = 2048; /* A guess, just in case */ 663 } else { 664 #if 0 665 if (cdrom_get_last_written(&cd->cdi, 666 &cd->capacity)) 667 #endif 668 cd->capacity = 1 + ((buffer[0] << 24) | 669 (buffer[1] << 16) | 670 (buffer[2] << 8) | 671 buffer[3]); 672 sector_size = (buffer[4] << 24) | 673 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 674 switch (sector_size) { 675 /* 676 * HP 4020i CD-Recorder reports 2340 byte sectors 677 * Philips CD-Writers report 2352 byte sectors 678 * 679 * Use 2k sectors for them.. 680 */ 681 case 0: 682 case 2340: 683 case 2352: 684 sector_size = 2048; 685 /* fall through */ 686 case 2048: 687 cd->capacity *= 4; 688 /* fall through */ 689 case 512: 690 break; 691 default: 692 printk("%s: unsupported sector size %d.\n", 693 cd->cdi.name, sector_size); 694 cd->capacity = 0; 695 } 696 697 cd->device->sector_size = sector_size; 698 699 /* 700 * Add this so that we have the ability to correctly gauge 701 * what the device is capable of. 702 */ 703 set_capacity(cd->disk, cd->capacity); 704 } 705 706 queue = cd->device->request_queue; 707 blk_queue_hardsect_size(queue, sector_size); 708 out: 709 kfree(buffer); 710 return; 711 712 Enomem: 713 cd->capacity = 0x1fffff; 714 cd->device->sector_size = 2048; /* A guess, just in case */ 715 goto out; 716 } 717 718 static void get_capabilities(struct scsi_cd *cd) 719 { 720 unsigned char *buffer; 721 struct scsi_mode_data data; 722 unsigned char cmd[MAX_COMMAND_SIZE]; 723 struct scsi_sense_hdr sshdr; 724 unsigned int the_result; 725 int retries, rc, n; 726 727 static const char *loadmech[] = 728 { 729 "caddy", 730 "tray", 731 "pop-up", 732 "", 733 "changer", 734 "cartridge changer", 735 "", 736 "" 737 }; 738 739 740 /* allocate transfer buffer */ 741 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 742 if (!buffer) { 743 printk(KERN_ERR "sr: out of memory.\n"); 744 return; 745 } 746 747 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 748 * conditions are gone, or a timeout happens 749 */ 750 retries = 0; 751 do { 752 memset((void *)cmd, 0, MAX_COMMAND_SIZE); 753 cmd[0] = TEST_UNIT_READY; 754 755 the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL, 756 0, &sshdr, SR_TIMEOUT, 757 MAX_RETRIES); 758 759 retries++; 760 } while (retries < 5 && 761 (!scsi_status_is_good(the_result) || 762 (scsi_sense_valid(&sshdr) && 763 sshdr.sense_key == UNIT_ATTENTION))); 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(disk->first_minor, 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 del_gendisk(cd->disk); 885 886 mutex_lock(&sr_ref_mutex); 887 kref_put(&cd->kref, sr_kref_release); 888 mutex_unlock(&sr_ref_mutex); 889 890 return 0; 891 } 892 893 static int __init init_sr(void) 894 { 895 int rc; 896 897 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 898 if (rc) 899 return rc; 900 rc = scsi_register_driver(&sr_template.gendrv); 901 if (rc) 902 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 903 904 return rc; 905 } 906 907 static void __exit exit_sr(void) 908 { 909 scsi_unregister_driver(&sr_template.gendrv); 910 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 911 } 912 913 module_init(init_sr); 914 module_exit(exit_sr); 915 MODULE_LICENSE("GPL"); 916