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_eh.h> 54 #include <scsi/scsi_host.h> 55 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 56 #include <scsi/scsi_request.h> 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 /* 203 * If the disk changed, the capacity will now be different, 204 * so we force a re-read of this information 205 * Force 2048 for the sector size so that filesystems won't 206 * be trying to use something that is too small if the disc 207 * has changed. 208 */ 209 cd->needs_sector_size = 1; 210 cd->device->sector_size = 2048; 211 } 212 return retval; 213 } 214 215 /* 216 * rw_intr is the interrupt routine for the device driver. 217 * 218 * It will be notified on the end of a SCSI read / write, and will take on 219 * of several actions based on success or failure. 220 */ 221 static void rw_intr(struct scsi_cmnd * SCpnt) 222 { 223 int result = SCpnt->result; 224 int this_count = SCpnt->bufflen; 225 int good_bytes = (result == 0 ? this_count : 0); 226 int block_sectors = 0; 227 long error_sector; 228 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 229 230 #ifdef DEBUG 231 printk("sr.c done: %x\n", result); 232 #endif 233 234 /* 235 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 236 * success. Since this is a relatively rare error condition, no 237 * care is taken to avoid unnecessary additional work such as 238 * memcpy's that could be avoided. 239 */ 240 if (driver_byte(result) != 0 && /* An error occurred */ 241 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 242 switch (SCpnt->sense_buffer[2]) { 243 case MEDIUM_ERROR: 244 case VOLUME_OVERFLOW: 245 case ILLEGAL_REQUEST: 246 if (!(SCpnt->sense_buffer[0] & 0x90)) 247 break; 248 if (!blk_fs_request(SCpnt->request)) 249 break; 250 error_sector = (SCpnt->sense_buffer[3] << 24) | 251 (SCpnt->sense_buffer[4] << 16) | 252 (SCpnt->sense_buffer[5] << 8) | 253 SCpnt->sense_buffer[6]; 254 if (SCpnt->request->bio != NULL) 255 block_sectors = 256 bio_sectors(SCpnt->request->bio); 257 if (block_sectors < 4) 258 block_sectors = 4; 259 if (cd->device->sector_size == 2048) 260 error_sector <<= 2; 261 error_sector &= ~(block_sectors - 1); 262 good_bytes = (error_sector - SCpnt->request->sector) << 9; 263 if (good_bytes < 0 || good_bytes >= this_count) 264 good_bytes = 0; 265 /* 266 * The SCSI specification allows for the value 267 * returned by READ CAPACITY to be up to 75 2K 268 * sectors past the last readable block. 269 * Therefore, if we hit a medium error within the 270 * last 75 2K sectors, we decrease the saved size 271 * value. 272 */ 273 if (error_sector < get_capacity(cd->disk) && 274 cd->capacity - error_sector < 4 * 75) 275 set_capacity(cd->disk, error_sector); 276 break; 277 278 case RECOVERED_ERROR: 279 280 /* 281 * An error occured, but it recovered. Inform the 282 * user, but make sure that it's not treated as a 283 * hard error. 284 */ 285 scsi_print_sense("sr", SCpnt); 286 SCpnt->result = 0; 287 SCpnt->sense_buffer[0] = 0x0; 288 good_bytes = this_count; 289 break; 290 291 default: 292 break; 293 } 294 } 295 296 /* 297 * This calls the generic completion function, now that we know 298 * how many actual sectors finished, and how many sectors we need 299 * to say have failed. 300 */ 301 scsi_io_completion(SCpnt, good_bytes, block_sectors << 9); 302 } 303 304 static int sr_init_command(struct scsi_cmnd * SCpnt) 305 { 306 int block=0, this_count, s_size, timeout = SR_TIMEOUT; 307 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 308 309 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 310 cd->disk->disk_name, block)); 311 312 if (!cd->device || !scsi_device_online(cd->device)) { 313 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", 314 SCpnt->request->nr_sectors)); 315 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 316 return 0; 317 } 318 319 if (cd->device->changed) { 320 /* 321 * quietly refuse to do anything to a changed disc until the 322 * changed bit has been reset 323 */ 324 return 0; 325 } 326 327 /* 328 * these are already setup, just copy cdb basically 329 */ 330 if (SCpnt->request->flags & REQ_BLOCK_PC) { 331 struct request *rq = SCpnt->request; 332 333 if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd)) 334 return 0; 335 336 memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd)); 337 if (!rq->data_len) 338 SCpnt->sc_data_direction = DMA_NONE; 339 else if (rq_data_dir(rq) == WRITE) 340 SCpnt->sc_data_direction = DMA_TO_DEVICE; 341 else 342 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 343 344 this_count = rq->data_len; 345 if (rq->timeout) 346 timeout = rq->timeout; 347 348 SCpnt->transfersize = rq->data_len; 349 goto queue; 350 } 351 352 if (!(SCpnt->request->flags & REQ_CMD)) { 353 blk_dump_rq_flags(SCpnt->request, "sr unsup command"); 354 return 0; 355 } 356 357 /* 358 * we do lazy blocksize switching (when reading XA sectors, 359 * see CDROMREADMODE2 ioctl) 360 */ 361 s_size = cd->device->sector_size; 362 if (s_size > 2048) { 363 if (!in_interrupt()) 364 sr_set_blocklength(cd, 2048); 365 else 366 printk("sr: can't switch blocksize: in interrupt\n"); 367 } 368 369 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 370 printk("sr: bad sector size %d\n", s_size); 371 return 0; 372 } 373 374 if (rq_data_dir(SCpnt->request) == WRITE) { 375 if (!cd->device->writeable) 376 return 0; 377 SCpnt->cmnd[0] = WRITE_10; 378 SCpnt->sc_data_direction = DMA_TO_DEVICE; 379 cd->cdi.media_written = 1; 380 } else if (rq_data_dir(SCpnt->request) == READ) { 381 SCpnt->cmnd[0] = READ_10; 382 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 383 } else { 384 blk_dump_rq_flags(SCpnt->request, "Unknown sr command"); 385 return 0; 386 } 387 388 { 389 struct scatterlist *sg = SCpnt->request_buffer; 390 int i, size = 0; 391 for (i = 0; i < SCpnt->use_sg; i++) 392 size += sg[i].length; 393 394 if (size != SCpnt->request_bufflen && SCpnt->use_sg) { 395 printk(KERN_ERR "sr: mismatch count %d, bytes %d\n", 396 size, SCpnt->request_bufflen); 397 if (SCpnt->request_bufflen > size) 398 SCpnt->request_bufflen = SCpnt->bufflen = size; 399 } 400 } 401 402 /* 403 * request doesn't start on hw block boundary, add scatter pads 404 */ 405 if (((unsigned int)SCpnt->request->sector % (s_size >> 9)) || 406 (SCpnt->request_bufflen % s_size)) { 407 printk("sr: unaligned transfer\n"); 408 return 0; 409 } 410 411 this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9); 412 413 414 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", 415 cd->cdi.name, 416 (rq_data_dir(SCpnt->request) == WRITE) ? 417 "writing" : "reading", 418 this_count, SCpnt->request->nr_sectors)); 419 420 SCpnt->cmnd[1] = 0; 421 block = (unsigned int)SCpnt->request->sector / (s_size >> 9); 422 423 if (this_count > 0xffff) { 424 this_count = 0xffff; 425 SCpnt->request_bufflen = SCpnt->bufflen = 426 this_count * s_size; 427 } 428 429 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 430 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 431 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 432 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 433 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 434 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 435 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 436 437 /* 438 * We shouldn't disconnect in the middle of a sector, so with a dumb 439 * host adapter, it's safe to assume that we can at least transfer 440 * this many bytes between each connect / disconnect. 441 */ 442 SCpnt->transfersize = cd->device->sector_size; 443 SCpnt->underflow = this_count << 9; 444 445 queue: 446 SCpnt->allowed = MAX_RETRIES; 447 SCpnt->timeout_per_command = timeout; 448 449 /* 450 * This is the completion routine we use. This is matched in terms 451 * of capability to this function. 452 */ 453 SCpnt->done = rw_intr; 454 455 /* 456 * This indicates that the command is ready from our end to be 457 * queued. 458 */ 459 return 1; 460 } 461 462 static int sr_block_open(struct inode *inode, struct file *file) 463 { 464 struct gendisk *disk = inode->i_bdev->bd_disk; 465 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 466 int ret = 0; 467 468 if(!(cd = scsi_cd_get(disk))) 469 return -ENXIO; 470 471 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) 472 scsi_cd_put(cd); 473 474 return ret; 475 } 476 477 static int sr_block_release(struct inode *inode, struct file *file) 478 { 479 int ret; 480 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 481 ret = cdrom_release(&cd->cdi, file); 482 if(ret) 483 return ret; 484 485 scsi_cd_put(cd); 486 487 return 0; 488 } 489 490 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, 491 unsigned long arg) 492 { 493 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 494 struct scsi_device *sdev = cd->device; 495 496 /* 497 * Send SCSI addressing ioctls directly to mid level, send other 498 * ioctls to cdrom/block level. 499 */ 500 switch (cmd) { 501 case SCSI_IOCTL_GET_IDLUN: 502 case SCSI_IOCTL_GET_BUS_NUMBER: 503 return scsi_ioctl(sdev, cmd, (void __user *)arg); 504 } 505 return cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); 506 } 507 508 static int sr_block_media_changed(struct gendisk *disk) 509 { 510 struct scsi_cd *cd = scsi_cd(disk); 511 return cdrom_media_changed(&cd->cdi); 512 } 513 514 static struct block_device_operations sr_bdops = 515 { 516 .owner = THIS_MODULE, 517 .open = sr_block_open, 518 .release = sr_block_release, 519 .ioctl = sr_block_ioctl, 520 .media_changed = sr_block_media_changed, 521 /* 522 * No compat_ioctl for now because sr_block_ioctl never 523 * seems to pass arbitary ioctls down to host drivers. 524 */ 525 }; 526 527 static int sr_open(struct cdrom_device_info *cdi, int purpose) 528 { 529 struct scsi_cd *cd = cdi->handle; 530 struct scsi_device *sdev = cd->device; 531 int retval; 532 533 /* 534 * If the device is in error recovery, wait until it is done. 535 * If the device is offline, then disallow any access to it. 536 */ 537 retval = -ENXIO; 538 if (!scsi_block_when_processing_errors(sdev)) 539 goto error_out; 540 541 /* 542 * If this device did not have media in the drive at boot time, then 543 * we would have been unable to get the sector size. Check to see if 544 * this is the case, and try again. 545 */ 546 if (cd->needs_sector_size) 547 get_sectorsize(cd); 548 return 0; 549 550 error_out: 551 return retval; 552 } 553 554 static void sr_release(struct cdrom_device_info *cdi) 555 { 556 struct scsi_cd *cd = cdi->handle; 557 558 if (cd->device->sector_size > 2048) 559 sr_set_blocklength(cd, 2048); 560 561 } 562 563 static int sr_probe(struct device *dev) 564 { 565 struct scsi_device *sdev = to_scsi_device(dev); 566 struct gendisk *disk; 567 struct scsi_cd *cd; 568 int minor, error; 569 570 error = -ENODEV; 571 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 572 goto fail; 573 574 error = -ENOMEM; 575 cd = kmalloc(sizeof(*cd), GFP_KERNEL); 576 if (!cd) 577 goto fail; 578 memset(cd, 0, sizeof(*cd)); 579 580 kref_init(&cd->kref); 581 582 disk = alloc_disk(1); 583 if (!disk) 584 goto fail_free; 585 586 spin_lock(&sr_index_lock); 587 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 588 if (minor == SR_DISKS) { 589 spin_unlock(&sr_index_lock); 590 error = -EBUSY; 591 goto fail_put; 592 } 593 __set_bit(minor, sr_index_bits); 594 spin_unlock(&sr_index_lock); 595 596 disk->major = SCSI_CDROM_MAJOR; 597 disk->first_minor = minor; 598 sprintf(disk->disk_name, "sr%d", minor); 599 disk->fops = &sr_bdops; 600 disk->flags = GENHD_FL_CD; 601 602 cd->device = sdev; 603 cd->disk = disk; 604 cd->driver = &sr_template; 605 cd->disk = disk; 606 cd->capacity = 0x1fffff; 607 cd->needs_sector_size = 1; 608 cd->device->changed = 1; /* force recheck CD type */ 609 cd->use = 1; 610 cd->readcd_known = 0; 611 cd->readcd_cdda = 0; 612 613 cd->cdi.ops = &sr_dops; 614 cd->cdi.handle = cd; 615 cd->cdi.mask = 0; 616 cd->cdi.capacity = 1; 617 sprintf(cd->cdi.name, "sr%d", minor); 618 619 sdev->sector_size = 2048; /* A guess, just in case */ 620 621 /* FIXME: need to handle a get_capabilities failure properly ?? */ 622 get_capabilities(cd); 623 sr_vendor_init(cd); 624 625 snprintf(disk->devfs_name, sizeof(disk->devfs_name), 626 "%s/cd", sdev->devfs_name); 627 disk->driverfs_dev = &sdev->sdev_gendev; 628 set_capacity(disk, cd->capacity); 629 disk->private_data = &cd->driver; 630 disk->queue = sdev->request_queue; 631 cd->cdi.disk = disk; 632 633 if (register_cdrom(&cd->cdi)) 634 goto fail_put; 635 636 dev_set_drvdata(dev, cd); 637 disk->flags |= GENHD_FL_REMOVABLE; 638 add_disk(disk); 639 640 printk(KERN_DEBUG 641 "Attached scsi CD-ROM %s at scsi%d, channel %d, id %d, lun %d\n", 642 cd->cdi.name, sdev->host->host_no, sdev->channel, 643 sdev->id, sdev->lun); 644 return 0; 645 646 fail_put: 647 put_disk(disk); 648 fail_free: 649 kfree(cd); 650 fail: 651 return error; 652 } 653 654 655 static void get_sectorsize(struct scsi_cd *cd) 656 { 657 unsigned char cmd[10]; 658 unsigned char *buffer; 659 int the_result, retries = 3; 660 int sector_size; 661 struct scsi_request *SRpnt = NULL; 662 request_queue_t *queue; 663 664 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 665 if (!buffer) 666 goto Enomem; 667 SRpnt = scsi_allocate_request(cd->device, GFP_KERNEL); 668 if (!SRpnt) 669 goto Enomem; 670 671 do { 672 cmd[0] = READ_CAPACITY; 673 memset((void *) &cmd[1], 0, 9); 674 /* Mark as really busy */ 675 SRpnt->sr_request->rq_status = RQ_SCSI_BUSY; 676 SRpnt->sr_cmd_len = 0; 677 678 memset(buffer, 0, 8); 679 680 /* Do the command and wait.. */ 681 SRpnt->sr_data_direction = DMA_FROM_DEVICE; 682 scsi_wait_req(SRpnt, (void *) cmd, (void *) buffer, 683 8, SR_TIMEOUT, MAX_RETRIES); 684 685 the_result = SRpnt->sr_result; 686 retries--; 687 688 } while (the_result && retries); 689 690 691 scsi_release_request(SRpnt); 692 SRpnt = NULL; 693 694 if (the_result) { 695 cd->capacity = 0x1fffff; 696 sector_size = 2048; /* A guess, just in case */ 697 cd->needs_sector_size = 1; 698 } else { 699 #if 0 700 if (cdrom_get_last_written(&cd->cdi, 701 &cd->capacity)) 702 #endif 703 cd->capacity = 1 + ((buffer[0] << 24) | 704 (buffer[1] << 16) | 705 (buffer[2] << 8) | 706 buffer[3]); 707 sector_size = (buffer[4] << 24) | 708 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 709 switch (sector_size) { 710 /* 711 * HP 4020i CD-Recorder reports 2340 byte sectors 712 * Philips CD-Writers report 2352 byte sectors 713 * 714 * Use 2k sectors for them.. 715 */ 716 case 0: 717 case 2340: 718 case 2352: 719 sector_size = 2048; 720 /* fall through */ 721 case 2048: 722 cd->capacity *= 4; 723 /* fall through */ 724 case 512: 725 break; 726 default: 727 printk("%s: unsupported sector size %d.\n", 728 cd->cdi.name, sector_size); 729 cd->capacity = 0; 730 cd->needs_sector_size = 1; 731 } 732 733 cd->device->sector_size = sector_size; 734 735 /* 736 * Add this so that we have the ability to correctly gauge 737 * what the device is capable of. 738 */ 739 cd->needs_sector_size = 0; 740 set_capacity(cd->disk, cd->capacity); 741 } 742 743 queue = cd->device->request_queue; 744 blk_queue_hardsect_size(queue, sector_size); 745 out: 746 kfree(buffer); 747 return; 748 749 Enomem: 750 cd->capacity = 0x1fffff; 751 sector_size = 2048; /* A guess, just in case */ 752 cd->needs_sector_size = 1; 753 if (SRpnt) 754 scsi_release_request(SRpnt); 755 goto out; 756 } 757 758 static void get_capabilities(struct scsi_cd *cd) 759 { 760 unsigned char *buffer; 761 struct scsi_mode_data data; 762 struct scsi_request *SRpnt; 763 unsigned char cmd[MAX_COMMAND_SIZE]; 764 unsigned int the_result; 765 int retries, rc, n; 766 767 static char *loadmech[] = 768 { 769 "caddy", 770 "tray", 771 "pop-up", 772 "", 773 "changer", 774 "cartridge changer", 775 "", 776 "" 777 }; 778 779 /* allocate a request for the TEST_UNIT_READY */ 780 SRpnt = scsi_allocate_request(cd->device, GFP_KERNEL); 781 if (!SRpnt) { 782 printk(KERN_WARNING "(get_capabilities:) Request allocation " 783 "failure.\n"); 784 return; 785 } 786 787 /* allocate transfer buffer */ 788 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 789 if (!buffer) { 790 printk(KERN_ERR "sr: out of memory.\n"); 791 scsi_release_request(SRpnt); 792 return; 793 } 794 795 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 796 * conditions are gone, or a timeout happens 797 */ 798 retries = 0; 799 do { 800 memset((void *)cmd, 0, MAX_COMMAND_SIZE); 801 cmd[0] = TEST_UNIT_READY; 802 803 SRpnt->sr_cmd_len = 0; 804 SRpnt->sr_sense_buffer[0] = 0; 805 SRpnt->sr_sense_buffer[2] = 0; 806 SRpnt->sr_data_direction = DMA_NONE; 807 808 scsi_wait_req (SRpnt, (void *) cmd, buffer, 809 0, SR_TIMEOUT, MAX_RETRIES); 810 811 the_result = SRpnt->sr_result; 812 retries++; 813 } while (retries < 5 && 814 (!scsi_status_is_good(the_result) || 815 ((driver_byte(the_result) & DRIVER_SENSE) && 816 SRpnt->sr_sense_buffer[2] == UNIT_ATTENTION))); 817 818 /* ask for mode page 0x2a */ 819 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 820 SR_TIMEOUT, 3, &data); 821 822 if (!scsi_status_is_good(rc)) { 823 /* failed, drive doesn't have capabilities mode page */ 824 cd->cdi.speed = 1; 825 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 826 CDC_DVD | CDC_DVD_RAM | 827 CDC_SELECT_DISC | CDC_SELECT_SPEED); 828 scsi_release_request(SRpnt); 829 kfree(buffer); 830 printk("%s: scsi-1 drive\n", cd->cdi.name); 831 return; 832 } 833 834 n = data.header_length + data.block_descriptor_length; 835 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 836 cd->readcd_known = 1; 837 cd->readcd_cdda = buffer[n + 5] & 0x01; 838 /* print some capability bits */ 839 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 840 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 841 cd->cdi.speed, 842 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 843 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 844 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 845 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 846 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 847 loadmech[buffer[n + 6] >> 5]); 848 if ((buffer[n + 6] >> 5) == 0) 849 /* caddy drives can't close tray... */ 850 cd->cdi.mask |= CDC_CLOSE_TRAY; 851 if ((buffer[n + 2] & 0x8) == 0) 852 /* not a DVD drive */ 853 cd->cdi.mask |= CDC_DVD; 854 if ((buffer[n + 3] & 0x20) == 0) 855 /* can't write DVD-RAM media */ 856 cd->cdi.mask |= CDC_DVD_RAM; 857 if ((buffer[n + 3] & 0x10) == 0) 858 /* can't write DVD-R media */ 859 cd->cdi.mask |= CDC_DVD_R; 860 if ((buffer[n + 3] & 0x2) == 0) 861 /* can't write CD-RW media */ 862 cd->cdi.mask |= CDC_CD_RW; 863 if ((buffer[n + 3] & 0x1) == 0) 864 /* can't write CD-R media */ 865 cd->cdi.mask |= CDC_CD_R; 866 if ((buffer[n + 6] & 0x8) == 0) 867 /* can't eject */ 868 cd->cdi.mask |= CDC_OPEN_TRAY; 869 870 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 871 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 872 cd->cdi.capacity = 873 cdrom_number_of_slots(&cd->cdi); 874 if (cd->cdi.capacity <= 1) 875 /* not a changer */ 876 cd->cdi.mask |= CDC_SELECT_DISC; 877 /*else I don't think it can close its tray 878 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 879 880 /* 881 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 882 */ 883 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 884 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 885 cd->device->writeable = 1; 886 } 887 888 scsi_release_request(SRpnt); 889 kfree(buffer); 890 } 891 892 /* 893 * sr_packet() is the entry point for the generic commands generated 894 * by the Uniform CD-ROM layer. 895 */ 896 static int sr_packet(struct cdrom_device_info *cdi, 897 struct packet_command *cgc) 898 { 899 if (cgc->timeout <= 0) 900 cgc->timeout = IOCTL_TIMEOUT; 901 902 sr_do_ioctl(cdi->handle, cgc); 903 904 return cgc->stat; 905 } 906 907 /** 908 * sr_kref_release - Called to free the scsi_cd structure 909 * @kref: pointer to embedded kref 910 * 911 * sr_ref_sem must be held entering this routine. Because it is 912 * called on last put, you should always use the scsi_cd_get() 913 * scsi_cd_put() helpers which manipulate the semaphore directly 914 * and never do a direct kref_put(). 915 **/ 916 static void sr_kref_release(struct kref *kref) 917 { 918 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 919 struct gendisk *disk = cd->disk; 920 921 spin_lock(&sr_index_lock); 922 clear_bit(disk->first_minor, sr_index_bits); 923 spin_unlock(&sr_index_lock); 924 925 unregister_cdrom(&cd->cdi); 926 927 disk->private_data = NULL; 928 929 put_disk(disk); 930 931 kfree(cd); 932 } 933 934 static int sr_remove(struct device *dev) 935 { 936 struct scsi_cd *cd = dev_get_drvdata(dev); 937 938 del_gendisk(cd->disk); 939 940 down(&sr_ref_sem); 941 kref_put(&cd->kref, sr_kref_release); 942 up(&sr_ref_sem); 943 944 return 0; 945 } 946 947 static int __init init_sr(void) 948 { 949 int rc; 950 951 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 952 if (rc) 953 return rc; 954 return scsi_register_driver(&sr_template.gendrv); 955 } 956 957 static void __exit exit_sr(void) 958 { 959 scsi_unregister_driver(&sr_template.gendrv); 960 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 961 } 962 963 module_init(init_sr); 964 module_exit(exit_sr); 965 MODULE_LICENSE("GPL"); 966