1 /* 2 * sr.c Copyright (C) 1992 David Giller 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * adapted from: 6 * sd.c Copyright (C) 1992 Drew Eckhardt 7 * Linux scsi disk driver by 8 * Drew Eckhardt <drew@colorado.edu> 9 * 10 * Modified by Eric Youngdale ericy@andante.org to 11 * add scatter-gather, multiple outstanding request, and other 12 * enhancements. 13 * 14 * Modified by Eric Youngdale eric@andante.org to support loadable 15 * low-level scsi drivers. 16 * 17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to 18 * provide auto-eject. 19 * 20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the 21 * generic cdrom interface 22 * 23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() 24 * interface, capabilities probe additions, ioctl cleanups, etc. 25 * 26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs 27 * 28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM 29 * transparently and lose the GHOST hack 30 * 31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 32 * check resource allocation in sr_init and some cleanups 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/string.h> 41 #include <linux/errno.h> 42 #include <linux/cdrom.h> 43 #include <linux/interrupt.h> 44 #include <linux/init.h> 45 #include <linux/blkdev.h> 46 #include <linux/mutex.h> 47 #include <asm/uaccess.h> 48 49 #include <scsi/scsi.h> 50 #include <scsi/scsi_dbg.h> 51 #include <scsi/scsi_device.h> 52 #include <scsi/scsi_driver.h> 53 #include <scsi/scsi_cmnd.h> 54 #include <scsi/scsi_eh.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 57 58 #include "scsi_logging.h" 59 #include "sr.h" 60 61 62 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 63 MODULE_LICENSE("GPL"); 64 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 65 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 66 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 67 68 #define SR_DISKS 256 69 70 #define SR_CAPABILITIES \ 71 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 72 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 73 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 74 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 75 CDC_MRW|CDC_MRW_W|CDC_RAM) 76 77 static int sr_probe(struct device *); 78 static int sr_remove(struct device *); 79 static int sr_done(struct scsi_cmnd *); 80 81 static struct scsi_driver sr_template = { 82 .owner = THIS_MODULE, 83 .gendrv = { 84 .name = "sr", 85 .probe = sr_probe, 86 .remove = sr_remove, 87 }, 88 .done = sr_done, 89 }; 90 91 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 92 static DEFINE_SPINLOCK(sr_index_lock); 93 94 /* This semaphore is used to mediate the 0->1 reference get in the 95 * face of object destruction (i.e. we can't allow a get on an 96 * object after last put) */ 97 static DEFINE_MUTEX(sr_ref_mutex); 98 99 static int sr_open(struct cdrom_device_info *, int); 100 static void sr_release(struct cdrom_device_info *); 101 102 static void get_sectorsize(struct scsi_cd *); 103 static void get_capabilities(struct scsi_cd *); 104 105 static int sr_media_change(struct cdrom_device_info *, int); 106 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 107 108 static struct cdrom_device_ops sr_dops = { 109 .open = sr_open, 110 .release = sr_release, 111 .drive_status = sr_drive_status, 112 .media_changed = sr_media_change, 113 .tray_move = sr_tray_move, 114 .lock_door = sr_lock_door, 115 .select_speed = sr_select_speed, 116 .get_last_session = sr_get_last_session, 117 .get_mcn = sr_get_mcn, 118 .reset = sr_reset, 119 .audio_ioctl = sr_audio_ioctl, 120 .capability = SR_CAPABILITIES, 121 .generic_packet = sr_packet, 122 }; 123 124 static void sr_kref_release(struct kref *kref); 125 126 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 127 { 128 return container_of(disk->private_data, struct scsi_cd, driver); 129 } 130 131 /* 132 * The get and put routines for the struct scsi_cd. Note this entity 133 * has a scsi_device pointer and owns a reference to this. 134 */ 135 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 136 { 137 struct scsi_cd *cd = NULL; 138 139 mutex_lock(&sr_ref_mutex); 140 if (disk->private_data == NULL) 141 goto out; 142 cd = scsi_cd(disk); 143 kref_get(&cd->kref); 144 if (scsi_device_get(cd->device)) 145 goto out_put; 146 goto out; 147 148 out_put: 149 kref_put(&cd->kref, sr_kref_release); 150 cd = NULL; 151 out: 152 mutex_unlock(&sr_ref_mutex); 153 return cd; 154 } 155 156 static void scsi_cd_put(struct scsi_cd *cd) 157 { 158 struct scsi_device *sdev = cd->device; 159 160 mutex_lock(&sr_ref_mutex); 161 kref_put(&cd->kref, sr_kref_release); 162 scsi_device_put(sdev); 163 mutex_unlock(&sr_ref_mutex); 164 } 165 166 /* identical to scsi_test_unit_ready except that it doesn't 167 * eat the NOT_READY returns for removable media */ 168 int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) 169 { 170 int retries = MAX_RETRIES; 171 int the_result; 172 u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; 173 174 /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION 175 * conditions are gone, or a timeout happens 176 */ 177 do { 178 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 179 0, sshdr, SR_TIMEOUT, 180 retries--); 181 if (scsi_sense_valid(sshdr) && 182 sshdr->sense_key == UNIT_ATTENTION) 183 sdev->changed = 1; 184 185 } while (retries > 0 && 186 (!scsi_status_is_good(the_result) || 187 (scsi_sense_valid(sshdr) && 188 sshdr->sense_key == UNIT_ATTENTION))); 189 return the_result; 190 } 191 192 /* 193 * This function checks to see if the media has been changed in the 194 * CDROM drive. It is possible that we have already sensed a change, 195 * or the drive may have sensed one and not yet reported it. We must 196 * be ready for either case. This function always reports the current 197 * value of the changed bit. If flag is 0, then the changed bit is reset. 198 * This function could be done as an ioctl, but we would need to have 199 * an inode for that to work, and we do not always have one. 200 */ 201 202 static int sr_media_change(struct cdrom_device_info *cdi, int slot) 203 { 204 struct scsi_cd *cd = cdi->handle; 205 int retval; 206 struct scsi_sense_hdr *sshdr; 207 208 if (CDSL_CURRENT != slot) { 209 /* no changer support */ 210 return -EINVAL; 211 } 212 213 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 214 retval = sr_test_unit_ready(cd->device, sshdr); 215 if (retval || (scsi_sense_valid(sshdr) && 216 /* 0x3a is medium not present */ 217 sshdr->asc == 0x3a)) { 218 /* Media not present or unable to test, unit probably not 219 * ready. This usually means there is no disc in the drive. 220 * Mark as changed, and we will figure it out later once 221 * the drive is available again. 222 */ 223 cd->device->changed = 1; 224 /* This will force a flush, if called from check_disk_change */ 225 retval = 1; 226 goto out; 227 }; 228 229 retval = cd->device->changed; 230 cd->device->changed = 0; 231 /* If the disk changed, the capacity will now be different, 232 * so we force a re-read of this information */ 233 if (retval) { 234 /* check multisession offset etc */ 235 sr_cd_check(cdi); 236 get_sectorsize(cd); 237 } 238 239 out: 240 /* Notify userspace, that media has changed. */ 241 if (retval != cd->previous_state) 242 sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, 243 GFP_KERNEL); 244 cd->previous_state = retval; 245 kfree(sshdr); 246 247 return retval; 248 } 249 250 /* 251 * sr_done is the interrupt routine for the device driver. 252 * 253 * It will be notified on the end of a SCSI read / write, and will take one 254 * of several actions based on success or failure. 255 */ 256 static int sr_done(struct scsi_cmnd *SCpnt) 257 { 258 int result = SCpnt->result; 259 int this_count = scsi_bufflen(SCpnt); 260 int good_bytes = (result == 0 ? this_count : 0); 261 int block_sectors = 0; 262 long error_sector; 263 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 264 265 #ifdef DEBUG 266 printk("sr.c done: %x\n", result); 267 #endif 268 269 /* 270 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 271 * success. Since this is a relatively rare error condition, no 272 * care is taken to avoid unnecessary additional work such as 273 * memcpy's that could be avoided. 274 */ 275 if (driver_byte(result) != 0 && /* An error occurred */ 276 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 277 switch (SCpnt->sense_buffer[2]) { 278 case MEDIUM_ERROR: 279 case VOLUME_OVERFLOW: 280 case ILLEGAL_REQUEST: 281 if (!(SCpnt->sense_buffer[0] & 0x90)) 282 break; 283 error_sector = (SCpnt->sense_buffer[3] << 24) | 284 (SCpnt->sense_buffer[4] << 16) | 285 (SCpnt->sense_buffer[5] << 8) | 286 SCpnt->sense_buffer[6]; 287 if (SCpnt->request->bio != NULL) 288 block_sectors = 289 bio_sectors(SCpnt->request->bio); 290 if (block_sectors < 4) 291 block_sectors = 4; 292 if (cd->device->sector_size == 2048) 293 error_sector <<= 2; 294 error_sector &= ~(block_sectors - 1); 295 good_bytes = (error_sector - SCpnt->request->sector) << 9; 296 if (good_bytes < 0 || good_bytes >= this_count) 297 good_bytes = 0; 298 /* 299 * The SCSI specification allows for the value 300 * returned by READ CAPACITY to be up to 75 2K 301 * sectors past the last readable block. 302 * Therefore, if we hit a medium error within the 303 * last 75 2K sectors, we decrease the saved size 304 * value. 305 */ 306 if (error_sector < get_capacity(cd->disk) && 307 cd->capacity - error_sector < 4 * 75) 308 set_capacity(cd->disk, error_sector); 309 break; 310 311 case RECOVERED_ERROR: 312 313 /* 314 * An error occured, but it recovered. Inform the 315 * user, but make sure that it's not treated as a 316 * hard error. 317 */ 318 scsi_print_sense("sr", SCpnt); 319 SCpnt->result = 0; 320 SCpnt->sense_buffer[0] = 0x0; 321 good_bytes = this_count; 322 break; 323 324 default: 325 break; 326 } 327 } 328 329 return good_bytes; 330 } 331 332 static int sr_prep_fn(struct request_queue *q, struct request *rq) 333 { 334 int block=0, this_count, s_size, timeout = SR_TIMEOUT; 335 struct scsi_cd *cd; 336 struct scsi_cmnd *SCpnt; 337 struct scsi_device *sdp = q->queuedata; 338 int ret; 339 340 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 341 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 342 goto out; 343 } else if (rq->cmd_type != REQ_TYPE_FS) { 344 ret = BLKPREP_KILL; 345 goto out; 346 } 347 ret = scsi_setup_fs_cmnd(sdp, rq); 348 if (ret != BLKPREP_OK) 349 goto out; 350 SCpnt = rq->special; 351 cd = scsi_cd(rq->rq_disk); 352 353 /* from here on until we're complete, any goto out 354 * is used for a killable error condition */ 355 ret = BLKPREP_KILL; 356 357 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 358 cd->disk->disk_name, block)); 359 360 if (!cd->device || !scsi_device_online(cd->device)) { 361 SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", 362 rq->nr_sectors)); 363 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 364 goto out; 365 } 366 367 if (cd->device->changed) { 368 /* 369 * quietly refuse to do anything to a changed disc until the 370 * changed bit has been reset 371 */ 372 goto out; 373 } 374 375 /* 376 * we do lazy blocksize switching (when reading XA sectors, 377 * see CDROMREADMODE2 ioctl) 378 */ 379 s_size = cd->device->sector_size; 380 if (s_size > 2048) { 381 if (!in_interrupt()) 382 sr_set_blocklength(cd, 2048); 383 else 384 printk("sr: can't switch blocksize: in interrupt\n"); 385 } 386 387 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 388 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 389 goto out; 390 } 391 392 if (rq_data_dir(rq) == WRITE) { 393 if (!cd->device->writeable) 394 goto out; 395 SCpnt->cmnd[0] = WRITE_10; 396 SCpnt->sc_data_direction = DMA_TO_DEVICE; 397 cd->cdi.media_written = 1; 398 } else if (rq_data_dir(rq) == READ) { 399 SCpnt->cmnd[0] = READ_10; 400 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 401 } else { 402 blk_dump_rq_flags(rq, "Unknown sr command"); 403 goto out; 404 } 405 406 { 407 struct scatterlist *sg; 408 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 409 410 scsi_for_each_sg(SCpnt, sg, sg_count, i) 411 size += sg->length; 412 413 if (size != scsi_bufflen(SCpnt)) { 414 scmd_printk(KERN_ERR, SCpnt, 415 "mismatch count %d, bytes %d\n", 416 size, scsi_bufflen(SCpnt)); 417 if (scsi_bufflen(SCpnt) > size) 418 SCpnt->sdb.length = size; 419 } 420 } 421 422 /* 423 * request doesn't start on hw block boundary, add scatter pads 424 */ 425 if (((unsigned int)rq->sector % (s_size >> 9)) || 426 (scsi_bufflen(SCpnt) % s_size)) { 427 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 428 goto out; 429 } 430 431 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 432 433 434 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", 435 cd->cdi.name, 436 (rq_data_dir(rq) == WRITE) ? 437 "writing" : "reading", 438 this_count, rq->nr_sectors)); 439 440 SCpnt->cmnd[1] = 0; 441 block = (unsigned int)rq->sector / (s_size >> 9); 442 443 if (this_count > 0xffff) { 444 this_count = 0xffff; 445 SCpnt->sdb.length = this_count * s_size; 446 } 447 448 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 449 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 450 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 451 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 452 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 453 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 454 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 455 456 /* 457 * We shouldn't disconnect in the middle of a sector, so with a dumb 458 * host adapter, it's safe to assume that we can at least transfer 459 * this many bytes between each connect / disconnect. 460 */ 461 SCpnt->transfersize = cd->device->sector_size; 462 SCpnt->underflow = this_count << 9; 463 SCpnt->allowed = MAX_RETRIES; 464 SCpnt->timeout_per_command = timeout; 465 466 /* 467 * This indicates that the command is ready from our end to be 468 * queued. 469 */ 470 ret = BLKPREP_OK; 471 out: 472 return scsi_prep_return(q, rq, ret); 473 } 474 475 static int sr_block_open(struct inode *inode, struct file *file) 476 { 477 struct gendisk *disk = inode->i_bdev->bd_disk; 478 struct scsi_cd *cd; 479 int ret = 0; 480 481 if(!(cd = scsi_cd_get(disk))) 482 return -ENXIO; 483 484 if((ret = cdrom_open(&cd->cdi, inode, file)) != 0) 485 scsi_cd_put(cd); 486 487 return ret; 488 } 489 490 static int sr_block_release(struct inode *inode, struct file *file) 491 { 492 int ret; 493 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 494 ret = cdrom_release(&cd->cdi, file); 495 if(ret) 496 return ret; 497 498 scsi_cd_put(cd); 499 500 return 0; 501 } 502 503 static int sr_block_ioctl(struct inode *inode, struct file *file, unsigned cmd, 504 unsigned long arg) 505 { 506 struct scsi_cd *cd = scsi_cd(inode->i_bdev->bd_disk); 507 struct scsi_device *sdev = cd->device; 508 void __user *argp = (void __user *)arg; 509 int ret; 510 511 /* 512 * Send SCSI addressing ioctls directly to mid level, send other 513 * ioctls to cdrom/block level. 514 */ 515 switch (cmd) { 516 case SCSI_IOCTL_GET_IDLUN: 517 case SCSI_IOCTL_GET_BUS_NUMBER: 518 return scsi_ioctl(sdev, cmd, argp); 519 } 520 521 ret = cdrom_ioctl(file, &cd->cdi, inode, cmd, arg); 522 if (ret != -ENOSYS) 523 return ret; 524 525 /* 526 * ENODEV means that we didn't recognise the ioctl, or that we 527 * cannot execute it in the current device state. In either 528 * case fall through to scsi_ioctl, which will return ENDOEV again 529 * if it doesn't recognise the ioctl 530 */ 531 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, NULL); 532 if (ret != -ENODEV) 533 return ret; 534 return scsi_ioctl(sdev, cmd, argp); 535 } 536 537 static int sr_block_media_changed(struct gendisk *disk) 538 { 539 struct scsi_cd *cd = scsi_cd(disk); 540 return cdrom_media_changed(&cd->cdi); 541 } 542 543 static struct block_device_operations sr_bdops = 544 { 545 .owner = THIS_MODULE, 546 .open = sr_block_open, 547 .release = sr_block_release, 548 .ioctl = sr_block_ioctl, 549 .media_changed = sr_block_media_changed, 550 /* 551 * No compat_ioctl for now because sr_block_ioctl never 552 * seems to pass arbitary ioctls down to host drivers. 553 */ 554 }; 555 556 static int sr_open(struct cdrom_device_info *cdi, int purpose) 557 { 558 struct scsi_cd *cd = cdi->handle; 559 struct scsi_device *sdev = cd->device; 560 int retval; 561 562 /* 563 * If the device is in error recovery, wait until it is done. 564 * If the device is offline, then disallow any access to it. 565 */ 566 retval = -ENXIO; 567 if (!scsi_block_when_processing_errors(sdev)) 568 goto error_out; 569 570 return 0; 571 572 error_out: 573 return retval; 574 } 575 576 static void sr_release(struct cdrom_device_info *cdi) 577 { 578 struct scsi_cd *cd = cdi->handle; 579 580 if (cd->device->sector_size > 2048) 581 sr_set_blocklength(cd, 2048); 582 583 } 584 585 static int sr_probe(struct device *dev) 586 { 587 struct scsi_device *sdev = to_scsi_device(dev); 588 struct gendisk *disk; 589 struct scsi_cd *cd; 590 int minor, error; 591 592 error = -ENODEV; 593 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 594 goto fail; 595 596 error = -ENOMEM; 597 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 598 if (!cd) 599 goto fail; 600 601 kref_init(&cd->kref); 602 603 disk = alloc_disk(1); 604 if (!disk) 605 goto fail_free; 606 607 spin_lock(&sr_index_lock); 608 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 609 if (minor == SR_DISKS) { 610 spin_unlock(&sr_index_lock); 611 error = -EBUSY; 612 goto fail_put; 613 } 614 __set_bit(minor, sr_index_bits); 615 spin_unlock(&sr_index_lock); 616 617 disk->major = SCSI_CDROM_MAJOR; 618 disk->first_minor = minor; 619 sprintf(disk->disk_name, "sr%d", minor); 620 disk->fops = &sr_bdops; 621 disk->flags = GENHD_FL_CD; 622 623 cd->device = sdev; 624 cd->disk = disk; 625 cd->driver = &sr_template; 626 cd->disk = disk; 627 cd->capacity = 0x1fffff; 628 cd->device->changed = 1; /* force recheck CD type */ 629 cd->previous_state = 1; 630 cd->use = 1; 631 cd->readcd_known = 0; 632 cd->readcd_cdda = 0; 633 634 cd->cdi.ops = &sr_dops; 635 cd->cdi.handle = cd; 636 cd->cdi.mask = 0; 637 cd->cdi.capacity = 1; 638 sprintf(cd->cdi.name, "sr%d", minor); 639 640 sdev->sector_size = 2048; /* A guess, just in case */ 641 642 /* FIXME: need to handle a get_capabilities failure properly ?? */ 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; 663 664 fail_put: 665 put_disk(disk); 666 fail_free: 667 kfree(cd); 668 fail: 669 return error; 670 } 671 672 673 static 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); 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 #if 0 701 if (cdrom_get_last_written(&cd->cdi, 702 &cd->capacity)) 703 #endif 704 cd->capacity = 1 + ((buffer[0] << 24) | 705 (buffer[1] << 16) | 706 (buffer[2] << 8) | 707 buffer[3]); 708 sector_size = (buffer[4] << 24) | 709 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 710 switch (sector_size) { 711 /* 712 * HP 4020i CD-Recorder reports 2340 byte sectors 713 * Philips CD-Writers report 2352 byte sectors 714 * 715 * Use 2k sectors for them.. 716 */ 717 case 0: 718 case 2340: 719 case 2352: 720 sector_size = 2048; 721 /* fall through */ 722 case 2048: 723 cd->capacity *= 4; 724 /* fall through */ 725 case 512: 726 break; 727 default: 728 printk("%s: unsupported sector size %d.\n", 729 cd->cdi.name, sector_size); 730 cd->capacity = 0; 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 set_capacity(cd->disk, cd->capacity); 740 } 741 742 queue = cd->device->request_queue; 743 blk_queue_hardsect_size(queue, sector_size); 744 745 return; 746 } 747 748 static void get_capabilities(struct scsi_cd *cd) 749 { 750 unsigned char *buffer; 751 struct scsi_mode_data data; 752 struct scsi_sense_hdr sshdr; 753 int rc, n; 754 755 static const char *loadmech[] = 756 { 757 "caddy", 758 "tray", 759 "pop-up", 760 "", 761 "changer", 762 "cartridge changer", 763 "", 764 "" 765 }; 766 767 768 /* allocate transfer buffer */ 769 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 770 if (!buffer) { 771 printk(KERN_ERR "sr: out of memory.\n"); 772 return; 773 } 774 775 /* eat unit attentions */ 776 sr_test_unit_ready(cd->device, &sshdr); 777 778 /* ask for mode page 0x2a */ 779 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 780 SR_TIMEOUT, 3, &data, NULL); 781 782 if (!scsi_status_is_good(rc)) { 783 /* failed, drive doesn't have capabilities mode page */ 784 cd->cdi.speed = 1; 785 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 786 CDC_DVD | CDC_DVD_RAM | 787 CDC_SELECT_DISC | CDC_SELECT_SPEED | 788 CDC_MRW | CDC_MRW_W | CDC_RAM); 789 kfree(buffer); 790 printk("%s: scsi-1 drive\n", cd->cdi.name); 791 return; 792 } 793 794 n = data.header_length + data.block_descriptor_length; 795 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 796 cd->readcd_known = 1; 797 cd->readcd_cdda = buffer[n + 5] & 0x01; 798 /* print some capability bits */ 799 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 800 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 801 cd->cdi.speed, 802 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 803 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 804 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 805 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 806 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 807 loadmech[buffer[n + 6] >> 5]); 808 if ((buffer[n + 6] >> 5) == 0) 809 /* caddy drives can't close tray... */ 810 cd->cdi.mask |= CDC_CLOSE_TRAY; 811 if ((buffer[n + 2] & 0x8) == 0) 812 /* not a DVD drive */ 813 cd->cdi.mask |= CDC_DVD; 814 if ((buffer[n + 3] & 0x20) == 0) 815 /* can't write DVD-RAM media */ 816 cd->cdi.mask |= CDC_DVD_RAM; 817 if ((buffer[n + 3] & 0x10) == 0) 818 /* can't write DVD-R media */ 819 cd->cdi.mask |= CDC_DVD_R; 820 if ((buffer[n + 3] & 0x2) == 0) 821 /* can't write CD-RW media */ 822 cd->cdi.mask |= CDC_CD_RW; 823 if ((buffer[n + 3] & 0x1) == 0) 824 /* can't write CD-R media */ 825 cd->cdi.mask |= CDC_CD_R; 826 if ((buffer[n + 6] & 0x8) == 0) 827 /* can't eject */ 828 cd->cdi.mask |= CDC_OPEN_TRAY; 829 830 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 831 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 832 cd->cdi.capacity = 833 cdrom_number_of_slots(&cd->cdi); 834 if (cd->cdi.capacity <= 1) 835 /* not a changer */ 836 cd->cdi.mask |= CDC_SELECT_DISC; 837 /*else I don't think it can close its tray 838 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 839 840 /* 841 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 842 */ 843 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 844 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 845 cd->device->writeable = 1; 846 } 847 848 kfree(buffer); 849 } 850 851 /* 852 * sr_packet() is the entry point for the generic commands generated 853 * by the Uniform CD-ROM layer. 854 */ 855 static int sr_packet(struct cdrom_device_info *cdi, 856 struct packet_command *cgc) 857 { 858 if (cgc->timeout <= 0) 859 cgc->timeout = IOCTL_TIMEOUT; 860 861 sr_do_ioctl(cdi->handle, cgc); 862 863 return cgc->stat; 864 } 865 866 /** 867 * sr_kref_release - Called to free the scsi_cd structure 868 * @kref: pointer to embedded kref 869 * 870 * sr_ref_mutex must be held entering this routine. Because it is 871 * called on last put, you should always use the scsi_cd_get() 872 * scsi_cd_put() helpers which manipulate the semaphore directly 873 * and never do a direct kref_put(). 874 **/ 875 static void sr_kref_release(struct kref *kref) 876 { 877 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 878 struct gendisk *disk = cd->disk; 879 880 spin_lock(&sr_index_lock); 881 clear_bit(disk->first_minor, sr_index_bits); 882 spin_unlock(&sr_index_lock); 883 884 unregister_cdrom(&cd->cdi); 885 886 disk->private_data = NULL; 887 888 put_disk(disk); 889 890 kfree(cd); 891 } 892 893 static int sr_remove(struct device *dev) 894 { 895 struct scsi_cd *cd = dev_get_drvdata(dev); 896 897 del_gendisk(cd->disk); 898 899 mutex_lock(&sr_ref_mutex); 900 kref_put(&cd->kref, sr_kref_release); 901 mutex_unlock(&sr_ref_mutex); 902 903 return 0; 904 } 905 906 static int __init init_sr(void) 907 { 908 int rc; 909 910 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 911 if (rc) 912 return rc; 913 rc = scsi_register_driver(&sr_template.gendrv); 914 if (rc) 915 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 916 917 return rc; 918 } 919 920 static void __exit exit_sr(void) 921 { 922 scsi_unregister_driver(&sr_template.gendrv); 923 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 924 } 925 926 module_init(init_sr); 927 module_exit(exit_sr); 928 MODULE_LICENSE("GPL"); 929