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/sched.h> 39 #include <linux/mm.h> 40 #include <linux/bio.h> 41 #include <linux/string.h> 42 #include <linux/errno.h> 43 #include <linux/cdrom.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.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 #define SR_DISKS 256 63 64 #define MAX_RETRIES 3 65 #define SR_TIMEOUT (30 * HZ) 66 #define SR_CAPABILITIES \ 67 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 68 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 69 CDC_PLAY_AUDIO|CDC_RESET|CDC_IOCTLS|CDC_DRIVE_STATUS| \ 70 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 71 CDC_MRW|CDC_MRW_W|CDC_RAM) 72 73 static int sr_probe(struct device *); 74 static int sr_remove(struct device *); 75 static int sr_init_command(struct scsi_cmnd *); 76 77 static struct scsi_driver sr_template = { 78 .owner = THIS_MODULE, 79 .gendrv = { 80 .name = "sr", 81 .probe = sr_probe, 82 .remove = sr_remove, 83 }, 84 .init_command = sr_init_command, 85 }; 86 87 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 88 static DEFINE_SPINLOCK(sr_index_lock); 89 90 /* This semaphore is used to mediate the 0->1 reference get in the 91 * face of object destruction (i.e. we can't allow a get on an 92 * object after last put) */ 93 static DECLARE_MUTEX(sr_ref_sem); 94 95 static int sr_open(struct cdrom_device_info *, int); 96 static void sr_release(struct cdrom_device_info *); 97 98 static void get_sectorsize(struct scsi_cd *); 99 static void get_capabilities(struct scsi_cd *); 100 101 static int sr_media_change(struct cdrom_device_info *, int); 102 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 103 104 static struct cdrom_device_ops sr_dops = { 105 .open = sr_open, 106 .release = sr_release, 107 .drive_status = sr_drive_status, 108 .media_changed = sr_media_change, 109 .tray_move = sr_tray_move, 110 .lock_door = sr_lock_door, 111 .select_speed = sr_select_speed, 112 .get_last_session = sr_get_last_session, 113 .get_mcn = sr_get_mcn, 114 .reset = sr_reset, 115 .audio_ioctl = sr_audio_ioctl, 116 .dev_ioctl = sr_dev_ioctl, 117 .capability = SR_CAPABILITIES, 118 .generic_packet = sr_packet, 119 }; 120 121 static void sr_kref_release(struct kref *kref); 122 123 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 124 { 125 return container_of(disk->private_data, struct scsi_cd, driver); 126 } 127 128 /* 129 * The get and put routines for the struct scsi_cd. Note this entity 130 * has a scsi_device pointer and owns a reference to this. 131 */ 132 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 133 { 134 struct scsi_cd *cd = NULL; 135 136 down(&sr_ref_sem); 137 if (disk->private_data == NULL) 138 goto out; 139 cd = scsi_cd(disk); 140 kref_get(&cd->kref); 141 if (scsi_device_get(cd->device)) 142 goto out_put; 143 goto out; 144 145 out_put: 146 kref_put(&cd->kref, sr_kref_release); 147 cd = NULL; 148 out: 149 up(&sr_ref_sem); 150 return cd; 151 } 152 153 static inline void scsi_cd_put(struct scsi_cd *cd) 154 { 155 struct scsi_device *sdev = cd->device; 156 157 down(&sr_ref_sem); 158 kref_put(&cd->kref, sr_kref_release); 159 scsi_device_put(sdev); 160 up(&sr_ref_sem); 161 } 162 163 /* 164 * This function checks to see if the media has been changed in the 165 * CDROM drive. It is possible that we have already sensed a change, 166 * or the drive may have sensed one and not yet reported it. We must 167 * be ready for either case. This function always reports the current 168 * value of the changed bit. If flag is 0, then the changed bit is reset. 169 * This function could be done as an ioctl, but we would need to have 170 * an inode for that to work, and we do not always have one. 171 */ 172 173 int sr_media_change(struct cdrom_device_info *cdi, int slot) 174 { 175 struct scsi_cd *cd = cdi->handle; 176 int retval; 177 178 if (CDSL_CURRENT != slot) { 179 /* no changer support */ 180 return -EINVAL; 181 } 182 183 retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES); 184 if (retval) { 185 /* Unable to test, unit probably not ready. This usually 186 * means there is no disc in the drive. Mark as changed, 187 * and we will figure it out later once the drive is 188 * available again. */ 189 cd->device->changed = 1; 190 return 1; /* This will force a flush, if called from 191 * check_disk_change */ 192 }; 193 194 retval = cd->device->changed; 195 cd->device->changed = 0; 196 /* If the disk changed, the capacity will now be different, 197 * so we force a re-read of this information */ 198 if (retval) { 199 /* check multisession offset etc */ 200 sr_cd_check(cdi); 201 202 get_sectorsize(cd); 203 } 204 return retval; 205 } 206 207 /* 208 * rw_intr is the interrupt routine for the device driver. 209 * 210 * It will be notified on the end of a SCSI read / write, and will take on 211 * of several actions based on success or failure. 212 */ 213 static void rw_intr(struct scsi_cmnd * SCpnt) 214 { 215 int result = SCpnt->result; 216 int this_count = SCpnt->bufflen; 217 int good_bytes = (result == 0 ? this_count : 0); 218 int block_sectors = 0; 219 long error_sector; 220 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 221 222 #ifdef DEBUG 223 printk("sr.c done: %x\n", result); 224 #endif 225 226 /* 227 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 228 * success. Since this is a relatively rare error condition, no 229 * care is taken to avoid unnecessary additional work such as 230 * memcpy's that could be avoided. 231 */ 232 if (driver_byte(result) != 0 && /* An error occurred */ 233 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 234 switch (SCpnt->sense_buffer[2]) { 235 case MEDIUM_ERROR: 236 case VOLUME_OVERFLOW: 237 case ILLEGAL_REQUEST: 238 if (!(SCpnt->sense_buffer[0] & 0x90)) 239 break; 240 if (!blk_fs_request(SCpnt->request)) 241 break; 242 error_sector = (SCpnt->sense_buffer[3] << 24) | 243 (SCpnt->sense_buffer[4] << 16) | 244 (SCpnt->sense_buffer[5] << 8) | 245 SCpnt->sense_buffer[6]; 246 if (SCpnt->request->bio != NULL) 247 block_sectors = 248 bio_sectors(SCpnt->request->bio); 249 if (block_sectors < 4) 250 block_sectors = 4; 251 if (cd->device->sector_size == 2048) 252 error_sector <<= 2; 253 error_sector &= ~(block_sectors - 1); 254 good_bytes = (error_sector - SCpnt->request->sector) << 9; 255 if (good_bytes < 0 || good_bytes >= this_count) 256 good_bytes = 0; 257 /* 258 * The SCSI specification allows for the value 259 * returned by READ CAPACITY to be up to 75 2K 260 * sectors past the last readable block. 261 * Therefore, if we hit a medium error within the 262 * last 75 2K sectors, we decrease the saved size 263 * value. 264 */ 265 if (error_sector < get_capacity(cd->disk) && 266 cd->capacity - error_sector < 4 * 75) 267 set_capacity(cd->disk, error_sector); 268 break; 269 270 case RECOVERED_ERROR: 271 272 /* 273 * An error occured, but it recovered. Inform the 274 * user, but make sure that it's not treated as a 275 * hard error. 276 */ 277 scsi_print_sense("sr", SCpnt); 278 SCpnt->result = 0; 279 SCpnt->sense_buffer[0] = 0x0; 280 good_bytes = this_count; 281 break; 282 283 default: 284 break; 285 } 286 } 287 288 /* 289 * This calls the generic completion function, now that we know 290 * how many actual sectors finished, and how many sectors we need 291 * to say have failed. 292 */ 293 scsi_io_completion(SCpnt, good_bytes, block_sectors << 9); 294 } 295 296 static int sr_init_command(struct scsi_cmnd * SCpnt) 297 { 298 int block=0, this_count, s_size, timeout = SR_TIMEOUT; 299 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 300 301 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 302 cd->disk->disk_name, block)); 303 304 if (!cd->device || !scsi_device_online(cd->device)) { 305 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", 306 SCpnt->request->nr_sectors)); 307 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 308 return 0; 309 } 310 311 if (cd->device->changed) { 312 /* 313 * quietly refuse to do anything to a changed disc until the 314 * changed bit has been reset 315 */ 316 return 0; 317 } 318 319 /* 320 * these are already setup, just copy cdb basically 321 */ 322 if (SCpnt->request->flags & REQ_BLOCK_PC) { 323 struct request *rq = SCpnt->request; 324 325 if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd)) 326 return 0; 327 328 memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd)); 329 SCpnt->cmd_len = rq->cmd_len; 330 if (!rq->data_len) 331 SCpnt->sc_data_direction = DMA_NONE; 332 else if (rq_data_dir(rq) == WRITE) 333 SCpnt->sc_data_direction = DMA_TO_DEVICE; 334 else 335 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 336 337 this_count = rq->data_len; 338 if (rq->timeout) 339 timeout = rq->timeout; 340 341 SCpnt->transfersize = rq->data_len; 342 goto queue; 343 } 344 345 if (!(SCpnt->request->flags & REQ_CMD)) { 346 blk_dump_rq_flags(SCpnt->request, "sr unsup command"); 347 return 0; 348 } 349 350 /* 351 * we do lazy blocksize switching (when reading XA sectors, 352 * see CDROMREADMODE2 ioctl) 353 */ 354 s_size = cd->device->sector_size; 355 if (s_size > 2048) { 356 if (!in_interrupt()) 357 sr_set_blocklength(cd, 2048); 358 else 359 printk("sr: can't switch blocksize: in interrupt\n"); 360 } 361 362 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 363 printk("sr: bad sector size %d\n", s_size); 364 return 0; 365 } 366 367 if (rq_data_dir(SCpnt->request) == WRITE) { 368 if (!cd->device->writeable) 369 return 0; 370 SCpnt->cmnd[0] = WRITE_10; 371 SCpnt->sc_data_direction = DMA_TO_DEVICE; 372 cd->cdi.media_written = 1; 373 } else if (rq_data_dir(SCpnt->request) == READ) { 374 SCpnt->cmnd[0] = READ_10; 375 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 376 } else { 377 blk_dump_rq_flags(SCpnt->request, "Unknown sr command"); 378 return 0; 379 } 380 381 { 382 struct scatterlist *sg = SCpnt->request_buffer; 383 int i, size = 0; 384 for (i = 0; i < SCpnt->use_sg; i++) 385 size += sg[i].length; 386 387 if (size != SCpnt->request_bufflen && SCpnt->use_sg) { 388 printk(KERN_ERR "sr: mismatch count %d, bytes %d\n", 389 size, SCpnt->request_bufflen); 390 if (SCpnt->request_bufflen > size) 391 SCpnt->request_bufflen = SCpnt->bufflen = size; 392 } 393 } 394 395 /* 396 * request doesn't start on hw block boundary, add scatter pads 397 */ 398 if (((unsigned int)SCpnt->request->sector % (s_size >> 9)) || 399 (SCpnt->request_bufflen % s_size)) { 400 printk("sr: unaligned transfer\n"); 401 return 0; 402 } 403 404 this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9); 405 406 407 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", 408 cd->cdi.name, 409 (rq_data_dir(SCpnt->request) == WRITE) ? 410 "writing" : "reading", 411 this_count, SCpnt->request->nr_sectors)); 412 413 SCpnt->cmnd[1] = 0; 414 block = (unsigned int)SCpnt->request->sector / (s_size >> 9); 415 416 if (this_count > 0xffff) { 417 this_count = 0xffff; 418 SCpnt->request_bufflen = SCpnt->bufflen = 419 this_count * s_size; 420 } 421 422 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 423 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 424 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 425 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 426 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 427 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 428 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 429 430 /* 431 * We shouldn't disconnect in the middle of a sector, so with a dumb 432 * host adapter, it's safe to assume that we can at least transfer 433 * this many bytes between each connect / disconnect. 434 */ 435 SCpnt->transfersize = cd->device->sector_size; 436 SCpnt->underflow = this_count << 9; 437 438 queue: 439 SCpnt->allowed = MAX_RETRIES; 440 SCpnt->timeout_per_command = timeout; 441 442 /* 443 * This is the completion routine we use. This is matched in terms 444 * of capability to this function. 445 */ 446 SCpnt->done = rw_intr; 447 448 /* 449 * This indicates that the command is ready from our end to be 450 * queued. 451 */ 452 return 1; 453 } 454 455 static int sr_block_open(struct inode *inode, struct file *file) 456 { 457 struct gendisk *disk = inode->i_bdev->bd_disk; 458 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 459 int ret = 0; 460 461 if(!(cd = scsi_cd_get(disk))) 462 return -ENXIO; 463 464 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) 465 scsi_cd_put(cd); 466 467 return ret; 468 } 469 470 static int sr_block_release(struct inode *inode, struct file *file) 471 { 472 int ret; 473 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 474 ret = cdrom_release(&cd->cdi, file); 475 if(ret) 476 return ret; 477 478 scsi_cd_put(cd); 479 480 return 0; 481 } 482 483 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, 484 unsigned long arg) 485 { 486 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 487 struct scsi_device *sdev = cd->device; 488 489 /* 490 * Send SCSI addressing ioctls directly to mid level, send other 491 * ioctls to cdrom/block level. 492 */ 493 switch (cmd) { 494 case SCSI_IOCTL_GET_IDLUN: 495 case SCSI_IOCTL_GET_BUS_NUMBER: 496 return scsi_ioctl(sdev, cmd, (void __user *)arg); 497 } 498 return cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); 499 } 500 501 static int sr_block_media_changed(struct gendisk *disk) 502 { 503 struct scsi_cd *cd = scsi_cd(disk); 504 return cdrom_media_changed(&cd->cdi); 505 } 506 507 static struct block_device_operations sr_bdops = 508 { 509 .owner = THIS_MODULE, 510 .open = sr_block_open, 511 .release = sr_block_release, 512 .ioctl = sr_block_ioctl, 513 .media_changed = sr_block_media_changed, 514 /* 515 * No compat_ioctl for now because sr_block_ioctl never 516 * seems to pass arbitary ioctls down to host drivers. 517 */ 518 }; 519 520 static int sr_open(struct cdrom_device_info *cdi, int purpose) 521 { 522 struct scsi_cd *cd = cdi->handle; 523 struct scsi_device *sdev = cd->device; 524 int retval; 525 526 /* 527 * If the device is in error recovery, wait until it is done. 528 * If the device is offline, then disallow any access to it. 529 */ 530 retval = -ENXIO; 531 if (!scsi_block_when_processing_errors(sdev)) 532 goto error_out; 533 534 return 0; 535 536 error_out: 537 return retval; 538 } 539 540 static void sr_release(struct cdrom_device_info *cdi) 541 { 542 struct scsi_cd *cd = cdi->handle; 543 544 if (cd->device->sector_size > 2048) 545 sr_set_blocklength(cd, 2048); 546 547 } 548 549 static int sr_probe(struct device *dev) 550 { 551 struct scsi_device *sdev = to_scsi_device(dev); 552 struct gendisk *disk; 553 struct scsi_cd *cd; 554 int minor, error; 555 556 error = -ENODEV; 557 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 558 goto fail; 559 560 error = -ENOMEM; 561 cd = kmalloc(sizeof(*cd), GFP_KERNEL); 562 if (!cd) 563 goto fail; 564 memset(cd, 0, sizeof(*cd)); 565 566 kref_init(&cd->kref); 567 568 disk = alloc_disk(1); 569 if (!disk) 570 goto fail_free; 571 572 spin_lock(&sr_index_lock); 573 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 574 if (minor == SR_DISKS) { 575 spin_unlock(&sr_index_lock); 576 error = -EBUSY; 577 goto fail_put; 578 } 579 __set_bit(minor, sr_index_bits); 580 spin_unlock(&sr_index_lock); 581 582 disk->major = SCSI_CDROM_MAJOR; 583 disk->first_minor = minor; 584 sprintf(disk->disk_name, "sr%d", minor); 585 disk->fops = &sr_bdops; 586 disk->flags = GENHD_FL_CD; 587 588 cd->device = sdev; 589 cd->disk = disk; 590 cd->driver = &sr_template; 591 cd->disk = disk; 592 cd->capacity = 0x1fffff; 593 cd->device->changed = 1; /* force recheck CD type */ 594 cd->use = 1; 595 cd->readcd_known = 0; 596 cd->readcd_cdda = 0; 597 598 cd->cdi.ops = &sr_dops; 599 cd->cdi.handle = cd; 600 cd->cdi.mask = 0; 601 cd->cdi.capacity = 1; 602 sprintf(cd->cdi.name, "sr%d", minor); 603 604 sdev->sector_size = 2048; /* A guess, just in case */ 605 606 /* FIXME: need to handle a get_capabilities failure properly ?? */ 607 get_capabilities(cd); 608 sr_vendor_init(cd); 609 610 snprintf(disk->devfs_name, sizeof(disk->devfs_name), 611 "%s/cd", sdev->devfs_name); 612 disk->driverfs_dev = &sdev->sdev_gendev; 613 set_capacity(disk, cd->capacity); 614 disk->private_data = &cd->driver; 615 disk->queue = sdev->request_queue; 616 cd->cdi.disk = disk; 617 618 if (register_cdrom(&cd->cdi)) 619 goto fail_put; 620 621 dev_set_drvdata(dev, cd); 622 disk->flags |= GENHD_FL_REMOVABLE; 623 add_disk(disk); 624 625 printk(KERN_DEBUG 626 "Attached scsi CD-ROM %s at scsi%d, channel %d, id %d, lun %d\n", 627 cd->cdi.name, sdev->host->host_no, sdev->channel, 628 sdev->id, sdev->lun); 629 return 0; 630 631 fail_put: 632 put_disk(disk); 633 fail_free: 634 kfree(cd); 635 fail: 636 return error; 637 } 638 639 640 static void get_sectorsize(struct scsi_cd *cd) 641 { 642 unsigned char cmd[10]; 643 unsigned char *buffer; 644 int the_result, retries = 3; 645 int sector_size; 646 request_queue_t *queue; 647 648 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 649 if (!buffer) 650 goto Enomem; 651 652 do { 653 cmd[0] = READ_CAPACITY; 654 memset((void *) &cmd[1], 0, 9); 655 memset(buffer, 0, 8); 656 657 /* Do the command and wait.. */ 658 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 659 buffer, 8, NULL, SR_TIMEOUT, 660 MAX_RETRIES); 661 662 retries--; 663 664 } while (the_result && retries); 665 666 667 if (the_result) { 668 cd->capacity = 0x1fffff; 669 sector_size = 2048; /* A guess, just in case */ 670 } else { 671 #if 0 672 if (cdrom_get_last_written(&cd->cdi, 673 &cd->capacity)) 674 #endif 675 cd->capacity = 1 + ((buffer[0] << 24) | 676 (buffer[1] << 16) | 677 (buffer[2] << 8) | 678 buffer[3]); 679 sector_size = (buffer[4] << 24) | 680 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 681 switch (sector_size) { 682 /* 683 * HP 4020i CD-Recorder reports 2340 byte sectors 684 * Philips CD-Writers report 2352 byte sectors 685 * 686 * Use 2k sectors for them.. 687 */ 688 case 0: 689 case 2340: 690 case 2352: 691 sector_size = 2048; 692 /* fall through */ 693 case 2048: 694 cd->capacity *= 4; 695 /* fall through */ 696 case 512: 697 break; 698 default: 699 printk("%s: unsupported sector size %d.\n", 700 cd->cdi.name, sector_size); 701 cd->capacity = 0; 702 } 703 704 cd->device->sector_size = sector_size; 705 706 /* 707 * Add this so that we have the ability to correctly gauge 708 * what the device is capable of. 709 */ 710 set_capacity(cd->disk, cd->capacity); 711 } 712 713 queue = cd->device->request_queue; 714 blk_queue_hardsect_size(queue, sector_size); 715 out: 716 kfree(buffer); 717 return; 718 719 Enomem: 720 cd->capacity = 0x1fffff; 721 cd->device->sector_size = 2048; /* A guess, just in case */ 722 goto out; 723 } 724 725 static void get_capabilities(struct scsi_cd *cd) 726 { 727 unsigned char *buffer; 728 struct scsi_mode_data data; 729 unsigned char cmd[MAX_COMMAND_SIZE]; 730 struct scsi_sense_hdr sshdr; 731 unsigned int the_result; 732 int retries, rc, n; 733 734 static char *loadmech[] = 735 { 736 "caddy", 737 "tray", 738 "pop-up", 739 "", 740 "changer", 741 "cartridge changer", 742 "", 743 "" 744 }; 745 746 747 /* allocate transfer buffer */ 748 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 749 if (!buffer) { 750 printk(KERN_ERR "sr: out of memory.\n"); 751 return; 752 } 753 754 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 755 * conditions are gone, or a timeout happens 756 */ 757 retries = 0; 758 do { 759 memset((void *)cmd, 0, MAX_COMMAND_SIZE); 760 cmd[0] = TEST_UNIT_READY; 761 762 the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL, 763 0, &sshdr, SR_TIMEOUT, 764 MAX_RETRIES); 765 766 retries++; 767 } while (retries < 5 && 768 (!scsi_status_is_good(the_result) || 769 (scsi_sense_valid(&sshdr) && 770 sshdr.sense_key == UNIT_ATTENTION))); 771 772 /* ask for mode page 0x2a */ 773 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 774 SR_TIMEOUT, 3, &data, NULL); 775 776 if (!scsi_status_is_good(rc)) { 777 /* failed, drive doesn't have capabilities mode page */ 778 cd->cdi.speed = 1; 779 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 780 CDC_DVD | CDC_DVD_RAM | 781 CDC_SELECT_DISC | CDC_SELECT_SPEED); 782 kfree(buffer); 783 printk("%s: scsi-1 drive\n", cd->cdi.name); 784 return; 785 } 786 787 n = data.header_length + data.block_descriptor_length; 788 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 789 cd->readcd_known = 1; 790 cd->readcd_cdda = buffer[n + 5] & 0x01; 791 /* print some capability bits */ 792 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 793 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 794 cd->cdi.speed, 795 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 796 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 797 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 798 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 799 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 800 loadmech[buffer[n + 6] >> 5]); 801 if ((buffer[n + 6] >> 5) == 0) 802 /* caddy drives can't close tray... */ 803 cd->cdi.mask |= CDC_CLOSE_TRAY; 804 if ((buffer[n + 2] & 0x8) == 0) 805 /* not a DVD drive */ 806 cd->cdi.mask |= CDC_DVD; 807 if ((buffer[n + 3] & 0x20) == 0) 808 /* can't write DVD-RAM media */ 809 cd->cdi.mask |= CDC_DVD_RAM; 810 if ((buffer[n + 3] & 0x10) == 0) 811 /* can't write DVD-R media */ 812 cd->cdi.mask |= CDC_DVD_R; 813 if ((buffer[n + 3] & 0x2) == 0) 814 /* can't write CD-RW media */ 815 cd->cdi.mask |= CDC_CD_RW; 816 if ((buffer[n + 3] & 0x1) == 0) 817 /* can't write CD-R media */ 818 cd->cdi.mask |= CDC_CD_R; 819 if ((buffer[n + 6] & 0x8) == 0) 820 /* can't eject */ 821 cd->cdi.mask |= CDC_OPEN_TRAY; 822 823 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 824 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 825 cd->cdi.capacity = 826 cdrom_number_of_slots(&cd->cdi); 827 if (cd->cdi.capacity <= 1) 828 /* not a changer */ 829 cd->cdi.mask |= CDC_SELECT_DISC; 830 /*else I don't think it can close its tray 831 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 832 833 /* 834 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 835 */ 836 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 837 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 838 cd->device->writeable = 1; 839 } 840 841 kfree(buffer); 842 } 843 844 /* 845 * sr_packet() is the entry point for the generic commands generated 846 * by the Uniform CD-ROM layer. 847 */ 848 static int sr_packet(struct cdrom_device_info *cdi, 849 struct packet_command *cgc) 850 { 851 if (cgc->timeout <= 0) 852 cgc->timeout = IOCTL_TIMEOUT; 853 854 sr_do_ioctl(cdi->handle, cgc); 855 856 return cgc->stat; 857 } 858 859 /** 860 * sr_kref_release - Called to free the scsi_cd structure 861 * @kref: pointer to embedded kref 862 * 863 * sr_ref_sem must be held entering this routine. Because it is 864 * called on last put, you should always use the scsi_cd_get() 865 * scsi_cd_put() helpers which manipulate the semaphore directly 866 * and never do a direct kref_put(). 867 **/ 868 static void sr_kref_release(struct kref *kref) 869 { 870 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 871 struct gendisk *disk = cd->disk; 872 873 spin_lock(&sr_index_lock); 874 clear_bit(disk->first_minor, sr_index_bits); 875 spin_unlock(&sr_index_lock); 876 877 unregister_cdrom(&cd->cdi); 878 879 disk->private_data = NULL; 880 881 put_disk(disk); 882 883 kfree(cd); 884 } 885 886 static int sr_remove(struct device *dev) 887 { 888 struct scsi_cd *cd = dev_get_drvdata(dev); 889 890 del_gendisk(cd->disk); 891 892 down(&sr_ref_sem); 893 kref_put(&cd->kref, sr_kref_release); 894 up(&sr_ref_sem); 895 896 return 0; 897 } 898 899 static int __init init_sr(void) 900 { 901 int rc; 902 903 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 904 if (rc) 905 return rc; 906 return scsi_register_driver(&sr_template.gendrv); 907 } 908 909 static void __exit exit_sr(void) 910 { 911 scsi_unregister_driver(&sr_template.gendrv); 912 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 913 } 914 915 module_init(init_sr); 916 module_exit(exit_sr); 917 MODULE_LICENSE("GPL"); 918